Voltage conversion device, base station power supply system, and control method

Abstract

The application provides a voltage conversion device, a base station power supply system and a control method. A control circuit is configured to turn off a normally-on switch tube when an input voltage value of a voltage conversion circuit is greater than or equal to an output voltage value of the voltage conversion circuit, and a first sampling current value of the voltage conversion circuit is greater than or equal to a first current reference value.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a voltage conversion device, a base station power supply system, and a control method. Background Technology

[0002] In the field of power electronics, transformer circuits in power supply systems convert the input voltage provided at the input terminal (e.g., the power supply terminal) into an output voltage that matches the output terminal (e.g., the load terminal), thereby supplying power to the output terminal through the input terminal. Among these, the H-bridge transformer circuit is widely used due to its applicability to both charging and discharging scenarios, its wide port voltage range, and its strong adaptability. Please see [link to relevant documentation]. Figure 1 , Figure 1 This is a schematic diagram of an H-bridge transformer circuit. (Example) Figure 1 As shown, the H-bridge transformer circuit (hereinafter also referred to as the transformer circuit) includes an inductor and four switching transistors. The first switching transistor Q1 and the second switching transistor Q2 are connected in series at the midpoint of the first bridge arm, and the third switching transistor Q3 and the fourth switching transistor Q4 are connected in series at the midpoint of the second bridge arm. The inductor is connected to the midpoint of both bridge arms. This transformer circuit can switch between multiple power supply modes (e.g., boost discharge, buck discharge, boost charging, and buck charging) according to the application scenario. In practical applications, due to possible faults in the power supply system (e.g., short circuit or overload at the load end), it is necessary to disconnect the switching transistors in the transformer circuit to cut off the electrical connection between the power supply and the load. In the prior art, the power supply system usually needs to sample the port voltage and current of the transformer circuit and transmit them to the control chip (e.g., microcontroller unit, MCU). When the control chip determines that a system fault has occurred, it disconnects the high-frequency switching transistor corresponding to the current power supply mode of the transformer circuit (e.g., disconnecting the fourth switching transistor Q4 when the transformer circuit is performing boost discharge), or adjusts the power supply mode of the transformer circuit (e.g., adjusting the power supply mode of the transformer circuit to buck discharge).

[0003] During their research and practice, the inventors of this application discovered that, because the system needs to transmit the sampled signal to the MCU, and the MCU sends the control signal based on the current power supply mode, the response time from the occurrence of a fault to the receipt of the control signal is long, resulting in low safety. Furthermore, when the transformer circuit's power supply mode is boost-discharge, if a system fault occurs, causing the actual output voltage to be less than or equal to the input voltage, even if the fourth switch Q4 is disconnected, the presence of a body diode (or built-in diode) in the switches (e.g., the third switch Q3 and the fourth switch Q4) allows the power supply and load to remain electrically connected for a short period, jeopardizing the safety of electronic components in the system and resulting in low system safety. Summary of the Invention

[0004] This application provides a voltage conversion device, a base station power supply system, and a control method. When a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be too large, the normally on switching transistor can be turned off in time to cut off the electrical connection between the power supply and the load, thereby improving the safety of the system, responding quickly, having a simple structure, a convenient control method, strong applicability, extending the service life of components, and reducing costs.

[0005] In a first aspect, this application provides a voltage conversion device, which includes a control circuit and a transformer circuit. The transformer circuit includes a first switch, a second switch, a third switch, a fourth switch, and an inductor. Here, the first and second switches are connected in series at the midpoint of a first bridge arm, and the third and fourth switches are connected in series at the midpoint of a second bridge arm. The inductor is connected to the midpoints of both the first and second bridge arms. The two ends of the transformer circuit are connected to a power supply and a load, respectively. The control circuit is connected to the control terminal of a normally-on switch in the transformer circuit, which is either the first or third switch. The control circuit is used to turn off the normally-on switch when the input voltage of the transformer circuit is greater than or equal to the output voltage of the transformer circuit, and when the first sampled current value of the transformer circuit is greater than or equal to a first current reference value.

[0006] In this application, the transformer circuit includes a first switching transistor, a second switching transistor, a third switching transistor, a fourth switching transistor, and an inductor. This transformer circuit can switch between multiple power supply modes (e.g., boost discharge, buck discharge, boost charging, and buck charging) depending on the application scenario. Here, in the process of the transformer circuit using boost discharge mode to raise the voltage of the power supply to a voltage matching the load to supply power to the load, the first switching transistor in the transformer circuit acts as a normally-on switching transistor, and the fourth switching transistor acts as the main switching transistor. It is understood that when a fault occurs in the power supply system (e.g., a short circuit or overload at the load end), causing the actual output voltage of the transformer circuit to be less than or equal to the input voltage of the transformer circuit, if only the fourth switching transistor, which acts as the main switching transistor, is turned off, because there is a body diode (or an internal diode) in the switching transistors (e.g., the third and fourth switching transistors), the power supply and load will remain electrically connected for a short period of time, endangering the safety of electronic components in the system. Here, in the process of the transformer circuit using boost charging mode to raise the load voltage to a voltage matching the power supply, the third switch in the transformer circuit acts as a normally-on switch, and the second switch acts as the main switch. It is also understandable that when a fault occurs in the power supply system (e.g., a short circuit or overload at the power supply terminal), causing the actual output voltage of the transformer circuit to be less than or equal to the input voltage, if only the second switch, acting as the main switch, is turned off, the presence of a body diode (or an internal diode) in the switch (e.g., the first and second switches) would cause the power supply and load to remain electrically connected for a short period, jeopardizing the safety of electronic components in the system.

[0007] In this application, the voltage conversion device can determine the operating status of the power supply system based on the relationship between the input and output voltages of the transformer circuit, and simultaneously based on the relationship between the first sampled current value and the first current reference value. When a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive (e.g., the first sampled current value is greater than or equal to the first current reference value), the voltage conversion device can turn off the normally on switch in the transformer circuit to disconnect the electrical connection between the power supply and the load. Here, the control circuit in the voltage conversion device can turn off the normally on switch to disconnect the electrical connection between the load and the power supply when the input voltage value of the transformer circuit is greater than or equal to the output voltage value of the transformer circuit, and the first sampled current value of the transformer circuit is greater than or equal to the first current reference value.

[0008] By employing this application, the voltage conversion device can promptly shut off the normally-on switching transistor when a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive, thereby cutting off the electrical connection between the power supply and the load, improving system safety, providing rapid response, simple structure, convenient control method, strong applicability, extending component life, and reducing costs.

[0009] In conjunction with the first aspect, in a first possible implementation, the first sampled current value includes the input current value of the transformer circuit, the output current value of the transformer circuit, the input current value of the inductor, and / or the output current value of the inductor, which can be applied to different application scenarios.

[0010] In conjunction with the first aspect, in the second possible implementation, the control circuit is further configured to re-conduct the normally-on switch after turning off the normally-on switch when the input voltage is less than the output voltage, or when the first sampled current is less than or equal to the first current reset value. Here, the first current reset value is less than the first current reference value. This allows the voltage conversion device to re-conduct the normally-on switch after a power supply system fault is cleared or when the current in the power supply system is within a safe range (e.g., the first sampled current is less than or equal to the first current reset value), promptly restoring the electrical connection between the power supply and the load. This prevents power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load, ensuring stable system operation. The control is simple, responsive, highly adaptable, and efficient. Simultaneously, the first current reset value being less than the first current reference value prevents the control circuit from frequently switching the normally-on switch from on to off, or from off to on, extending the component's lifespan.

[0011] In a third possible implementation, in conjunction with the first aspect or the second possible implementation of the first aspect, the control circuit is further configured to re-conduct the normally-on switch based on the reset signal indication from the external central control system after turning off the normally-on switch. Here, when the external central control system determines that the power supply system fault has been eliminated, or adjusts the transformer circuit to a step-down discharge (or step-down charging) power supply mode to adapt to changes in the load (or power supply) impedance, or when the transformer circuit itself operates in a step-down discharge (or step-down charging) power supply mode, the central control system can send a corresponding reset signal to the voltage conversion device. When the voltage conversion device acquires, receives, or detects the reset signal from the external central control system, it can re-conduct the normally-on switch based on the reset signal indication from the external central control system (or maintain the normally-on or step-down switch in a conducting or turning-off state based on the step-down discharge or step-down charging power supply mode), promptly restoring the electrical connection between the power supply and the load, preventing power loss at the load (or power supply) due to prolonged disconnection of the power supply and load, ensuring stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0012] In conjunction with the third possible implementation of the first aspect, in the fourth possible implementation, the control circuit includes a comparison module and a logic control module. The input terminal of the comparison module is connected to the input terminal of the transformer circuit, the output terminal of the transformer circuit, and the first sampling point. The output terminal of the comparison module is connected to the control terminal of the normally-on switch through the logic control module. Here, the first sampling point includes the input terminal of the transformer circuit, the output terminal of the transformer circuit, the output terminal of the inductor, and / or the input terminal of the inductor. The comparison module is used to output a voltage comparison signal based on the relationship between the input voltage value and the output voltage value of the transformer circuit. The comparison module is also used to output a first current comparison signal based on the relationship between the first sampled current value and the first current reference value. Here, the first sampled current value is the current value of the first sampling point. The logic control module is used to control the normally-on switch to turn on or off based on the voltage comparison signal and the first current comparison signal.

[0013] In this application, the comparison module (which may consist of a comparison circuit or a circuit with comparison functionality) can output a voltage comparison signal based on the relationship between the input and output voltages of the transformer circuit, and can also output a first current comparison signal based on the relationship between the first sampled current value and the first current reference value. The logic control module (which may consist of a logic control circuit (e.g., an AND gate, NAND gate, etc.) or a circuit with logic judgment functionality) can control the normally-on switch to be turned on or off based on the voltage comparison signal and the first current comparison signal. It is understood that the voltage conversion device can determine the operating state of the power supply system based on the relationship between the first sampled current value and the first current reference value. When the power supply system is operating normally (e.g., the input voltage of the transformer circuit is less than the output voltage), the voltage conversion device can keep the normally-on switch in the transformer circuit on to maintain the electrical connection between the power supply and the load. When a power supply system fault occurs (e.g., a short circuit or excessive load) causing the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive, the voltage conversion device can turn off the normally-on switch in the transformer circuit to disconnect the electrical connection between the power supply and the load. Simultaneously, it can be understood that after the power supply system fault is cleared (e.g., the input voltage of the transformer circuit is less than the output voltage) or when the current value in the power supply system is within a safe range, the voltage conversion device can re-turn on the normally-on switch to promptly restore the electrical connection between the power supply and the load, preventing power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load. This ensures stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0014] By employing this application, the voltage conversion device can maintain the normally-on switching transistor in the transformer circuit during normal operation of the power supply system (e.g., when the input voltage of the transformer circuit is less than the output voltage), thereby maintaining the electrical connection between the power supply and the load. When a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive, the voltage conversion device can promptly turn off the normally-on switching transistor to disconnect the electrical connection between the power supply and the load. The voltage conversion device can also re-engage the normally-on switching transistor after the power supply system fault is cleared or when the current value in the power supply system is within a safe range, promptly restoring the electrical connection between the power supply and the load, and preventing power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load. The voltage conversion device can improve system safety while ensuring stable system operation, is easy to control, responds quickly, has strong applicability, and has high control efficiency.

[0015] In conjunction with the fourth possible implementation of the first aspect, in the fifth possible implementation, the comparison module is further configured to output a first current comparison signal based on the magnitude relationship between the first sampled current value, the first current reset value, and the first current reference value. It can be understood that the comparison module can also output the first current comparison signal based on the magnitude relationship between the first sampled current value, the first current reset value, and the first current reference value. Furthermore, the logic control module (which may consist of a logic control circuit (e.g., an AND gate, a NAND gate, etc.) or a circuit with logic judgment function) can control the normally-on switch to turn on or off based on the voltage comparison signal and the first current comparison signal. In other words, the voltage conversion device can re-conduct the normally-on switch after the power supply system fault is cleared or when the current value in the power supply system is within a safe range (e.g., the first sampled current value is less than or equal to the first current reset value), promptly restoring the electrical connection between the power supply and the load, preventing power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load, ensuring stable system operation, simple control, rapid response, strong applicability, and high control efficiency. At the same time, the first current reset value is less than the first current reference value, which can avoid the control circuit frequently controlling the normally on switch to switch off or switch from off to on, thus extending the service life of the component.

[0016] In conjunction with the fifth possible implementation of the first aspect, in the sixth possible implementation, when the transformer circuit supplies power to the load through the power supply based on the drive signal of the main switch transistor input by the external central control system, the fourth switch transistor is the main switch transistor, and the first switch transistor is a normally-on switch transistor. When the transformer circuit supplies power to the load through the load based on the drive signal of the main switch transistor input by the external central control system, the second switch transistor is the main switch transistor, and the third switch transistor is a normally-on switch transistor. It can be understood that the transformer circuit here can switch between multiple power supply modes (e.g., boost discharge, buck discharge, boost charging, and buck charging, etc.) according to the application scenario. The external central control system can directly or through the drive circuit provide different drive signals to the switch transistors of the transformer circuit to control the transformer circuit in different power supply modes. For example, when the external central control system uses the fourth switch transistor as the main switch transistor and inputs the corresponding drive signal of the main switch transistor, the transformer circuit is in boost discharge mode, supplying power to the load through the power supply. In this case, the first switch transistor acts as a normally-on switch transistor. For example, when the external central control system uses the second switch as the main switch and inputs the corresponding drive signal for the main switch, the transformer circuit operates in boost charging mode, supplying power through the load. In this case, the third switch acts as a normally-on switch. Here, the voltage conversion device can determine the power supply mode of the transformer circuit based on the drive signal of the main switch input by the external central control system. Then, when the transformer circuit is in different power supply modes, it controls the conduction or cutoff of the normally-on switch in the current power supply mode. This method is simple to control, responds quickly, and has strong applicability.

[0017] In conjunction with the sixth possible implementation of the first aspect, in the seventh possible implementation, the input terminal of the comparison module can be connected to the input terminal of the transformer circuit, the output terminal of the transformer circuit, the first sampling point, and the second sampling point. Here, the second sampling point includes the input terminal of the transformer circuit, the output terminal of the transformer circuit, the output terminal of the inductor, and / or the input terminal of the inductor. The comparison module is also used to output a second current comparison signal based on the relationship between the second sampled current value and the second current reference value. Here, the second sampled current value is the current value of the second sampling point. It can be understood that during the process of the transformer circuit using a boost discharge mode to raise the voltage of the power supply to a voltage matching the load and supply power to the load, the first switching transistor in the transformer circuit acts as a normally-on switching transistor, and the fourth switching transistor acts as the main switching transistor. During the process of the transformer circuit using a boost charging mode to raise the voltage of the load to a voltage matching the power supply and supply power to the power supply, the third switching transistor in the transformer circuit acts as a normally-on switching transistor, and the second switching transistor acts as the main switching transistor. In scenarios where the power supply mode switching of the transformer circuit is frequent, or in other application scenarios, the comparison module can output a first current comparison signal based not only on the relationship between the first sampled current value and the first current reference value, but also on the relationship between the second sampled current value and the second current reference value. Here, the first sampled current value can be the current value at a first sampling point set with the first switch transistor as a normally-on switch transistor, and the second sampled current value can be the current value at a second sampling point set with the third switch transistor as a normally-on switch transistor. Alternatively, the first sampled current value can be the current value at a first sampling point set with the third switch transistor as a normally-on switch transistor, and the second sampled current value at a second sampling point set with the first switch transistor as a normally-on switch transistor; the specific value can be determined according to the application scenario. In other words, when the transformer circuit is in a certain power supply mode (e.g., boost discharge mode or boost charge mode), if a fault occurs in the power supply system (e.g., short circuit or overload at the load end, or short circuit or overload at the power supply end), causing the actual output voltage of the transformer circuit to be less than or equal to the input voltage of the transformer circuit, and the current in the power supply system to be too large (e.g., the first sampling current value is greater than or equal to the first current reference value, or the second sampling current value is greater than or equal to the second current reference value), the voltage conversion device can turn off the normally on switching transistor in the transformer circuit (e.g., the first switching transistor, or the third switching transistor) to disconnect the electrical connection between the power supply and the load.

[0018] Using this application, the voltage conversion device can determine the operating status of the power supply system based on the relationship between the input and output voltages of the transformer circuit, as well as the relationship between the first sampled current value and the first current reference value, and the relationship between the second sampled current value and the second current reference value. When the transformer circuit uses different power supply modes, if a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive, the voltage conversion device can turn off the normally-on switching transistor in the transformer circuit under the current power supply mode to disconnect the electrical connection between the power supply and the load, thereby improving system safety, providing rapid response, simple structure, convenient control method, strong applicability, extending component lifespan, and reducing costs.

[0019] In conjunction with the seventh possible implementation of the first aspect, in the eighth possible implementation, the comparison module is further configured to output a second current comparison signal based on the relationship between the second sampled current value, the second current reset value, and the second current reference value. Here, the second current reset value is less than the second current reference value. It can be understood that in scenarios where the power supply mode switching of the transformer circuit is frequent or in other application scenarios, the comparison module can output not only the first current comparison signal based on the relationship between the first sampled current value, the first current reference value, and the first current reset value, but also the second current comparison signal based on the relationship between the second sampled current value, the second current reference value, and the second current reset value. Here, the first sampled current value can be the current value at a first sampling point set for the first switching transistor as a normally-on switching transistor, and the second sampled current value can be the current value at a second sampling point set for the third switching transistor as a normally-on switching transistor. Alternatively, the first sampled current value can be the current value at a first sampling point set for the third switching transistor as a normally-on switching transistor, and the second sampled current value can be the current value at a second sampling point set for the first switching transistor as a normally-on switching transistor; the specific value can be determined according to the application scenario. In other words, when the transformer circuit is in a certain power supply mode (e.g., boost discharge mode or boost charging mode), if the power supply system fault has been eliminated or the current value in the power supply system is within a safe range (e.g., the first sampled current value is less than or equal to the first current reset value, or the second sampled current value is less than or equal to the second current reset value), the voltage conversion device can re-turn on the normally-on switching transistor in the transformer circuit (e.g., the first switching transistor or the third switching transistor), promptly restoring the electrical connection between the power supply and the load. This avoids power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load, ensuring stable system operation, simple control, rapid response, strong applicability, and high control efficiency. Simultaneously, the second current reset value being less than the second current reference value avoids the control circuit frequently switching the normally-on switching transistor from on to off, or from off to on, extending the component's lifespan.

[0020] In conjunction with the eighth possible implementation of the first aspect, in the ninth possible implementation, the logic control module may include a latch-reset unit and a drive control unit. Here, the output of the comparison module can be connected to the drive control unit via the latch-reset unit. The latch-reset unit is used to output a target enable control signal based on a voltage comparison signal and a target current comparison signal. Here, the target current comparison signal and the target enable control signal are either a first current comparison signal and a first enable control signal, or a second current comparison signal and a second enable control signal. The drive control unit is used to control the target normally-on switch to be turned on or off based on the target enable control signal and the drive signal of the target normally-on switch input from the external central control system. Here, the target enable control signal and the target normally-on switch are either a first enable control signal and a first switch, or a second enable control signal and a third switch. It can be understood that the voltage conversion device can determine the operating status of the power supply system based on the voltage comparison signal and the target current comparison signal (e.g., the relationship between the first sampled current value, the first current reference value, and the first current reset value, or the relationship between the second sampled current value, the second current reference value, and the second current reset value). When the power supply system is operating normally (e.g., the input voltage of the transformer circuit is less than the output voltage), the voltage conversion device can output a target enable control signal (e.g., a first enable control signal or a second enable control signal) to keep the normally-on switching transistors (e.g., a first switching transistor or a third switching transistor) in the transformer circuit on to maintain the electrical connection between the power supply and the load. When a fault occurs in the power supply system (e.g., a short-circuit fault or excessive load) causing the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive (e.g., a first sampled current value is greater than or equal to a first current reference value, or a second sampled current value is greater than or equal to a second current reference value), the voltage conversion device can output a target enable control signal (e.g., a first enable control signal or a second enable control signal) to turn off the normally-on switching transistors (e.g., a first switching transistor or a third switching transistor) in the transformer circuit to disconnect the electrical connection between the power supply and the load. It can also be understood that after the power supply system fault is cleared (e.g., the input voltage of the transformer circuit is less than the output voltage) or the current value in the power supply system is within a safe range (e.g., the first sampled current value is less than or equal to the first current reset value, or the second sampled current value is less than or equal to the second current reset value), the voltage conversion device can output a target enable control signal (e.g., the first enable control signal or the second enable control signal) to re-conduct the normally turned-on switching transistor, promptly restore the electrical connection between the power supply and the load, avoid power loss at the load end (or the power supply end) due to prolonged disconnection of the power supply and the load, ensure stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0021] In conjunction with the ninth possible implementation of the first aspect, in the tenth possible implementation, the latching reset unit is further used to output a target enable control signal based on the voltage comparison signal, the target current comparison signal, and the reset signal of the external central control system. It can be understood that when the external central control system determines that the power supply system fault has been eliminated, or adjusts the transformer circuit to a step-down discharge (or step-down charging) power supply mode to adapt to changes in the load (or power supply) impedance, or when the transformer circuit itself operates in a step-down discharge (or step-down charging) power supply mode, the central control system can send a corresponding reset signal to the voltage conversion device. When the latching reset unit acquires, receives, or detects the reset signal from the external central control system, it can output a target enable control signal based on the voltage comparison signal, the target current comparison signal, and the reset signal of the external central control system, re-conducting the normally-on switch (or maintaining the normally-on or off state of the normally-on switch based on the step-down discharge or step-down charging power supply mode), promptly restoring the electrical connection between the power supply and the load, avoiding power loss at the load (or power supply) due to prolonged disconnection of the power supply and load, ensuring stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0022] Secondly, this application provides a base station power supply system, which may include a power supply, a voltage conversion device and a base station. The voltage conversion device includes a transformer circuit and a control circuit. The transformer circuit includes multiple switching transistors and an inductor. The power supply is connected to the base station through the transformer circuit. The control circuit is connected to the control terminal of the normally open switching transistor among the multiple switching transistors in the transformer circuit.

[0023] Using this application, the voltage conversion device can promptly shut off the normally-on switching transistor when a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be too large, thereby cutting off the electrical connection between the power supply and the base station, improving system safety, responding quickly, having a simple structure, a convenient control method, strong applicability, extending component life, and reducing costs.

[0024] In conjunction with the second aspect, in the first possible implementation, the base station power supply system may further include multiple voltage conversion devices, with each transformer circuit in the multiple voltage conversion devices corresponding to each control circuit in the multiple voltage conversion devices, and the power supply is connected to the base station after being connected in parallel through the transformer circuits in the multiple voltage conversion devices.

[0025] By employing this application, when a power supply system failure causes the input voltage of the transformer circuit in one of multiple voltage conversion devices to be greater than or equal to the output voltage and the current in the power supply system to be excessive, the voltage conversion device can promptly shut off the normally-on switching transistor to disconnect the electrical connection between part of the power supply and the load of the voltage conversion device. This can enrich application scenarios, improve system safety, extend component lifespan, and reduce costs.

[0026] Thirdly, this application provides a control method for a voltage conversion device, applicable to the voltage conversion device in the first aspect or any possible embodiment of the first aspect. The method includes: detecting the input voltage value of a transformer circuit, the output voltage value of the transformer circuit, and a first sampled current value. Here, the first sampled current value includes the input current value of the transformer circuit, the output current value of the transformer circuit, the input current value of the inductor, and / or the output current value of the inductor. When the input voltage value of the transformer circuit is greater than or equal to the output voltage value of the transformer circuit, and the first sampled current value is greater than or equal to a first current reference value, the normally on switching transistor is turned off.

[0027] In this application, the voltage conversion device can determine the operating status of the power supply system based on the relationship between the input and output voltages of the transformer circuit, and simultaneously based on the relationship between the first sampled current value and the first current reference value. When a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive (e.g., the first sampled current value is greater than or equal to the first current reference value), the voltage conversion device can turn off the normally on switch in the transformer circuit to disconnect the electrical connection between the power supply and the load. Here, the control circuit in the voltage conversion device can turn off the normally on switch when the input voltage value of the transformer circuit is greater than or equal to the output voltage value of the transformer circuit, and the first sampled current value of the transformer circuit is greater than or equal to the first current reference value, to disconnect the electrical connection between the load and the power supply. Here, the first sampled current value may include the input current value of the transformer circuit, the output current value of the transformer circuit, the input current value of the inductor, and / or the output current value of the inductor.

[0028] By employing this application, the voltage conversion device can promptly shut off the normally-on switching transistor when a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive, thereby cutting off the electrical connection between the power supply and the load, improving system safety, providing rapid response, simple structure, convenient control method, strong applicability, extending component life, and reducing costs.

[0029] In conjunction with the third aspect, in the first possible implementation, after turning off the normally-on switch, the method further includes: re-turning on the normally-on switch when the input voltage value is less than the output voltage value, or when the first sampled current value is less than or equal to the first current reset value. Here, the first current reset value is less than the first current reference value. Here, the voltage conversion device can re-turn on the normally-on switch after the power supply system fault is cleared or when the current value in the power supply system is within a safe range (e.g., the first sampled current value is less than or equal to the first current reset value), promptly restoring the electrical connection between the power supply and the load, avoiding power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load, ensuring stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0030] In conjunction with the third aspect or the first possible implementation of the third aspect, in the second possible implementation, after turning off the normally-on switch, the method further includes: re-conducting the normally-on switch based on the reset signal indication from the external central control system. Here, when the external central control system determines that the fault in the power supply system has been eliminated, or adjusts the transformer circuit to a step-down discharge (or step-down charging) power supply mode to adapt to changes in the impedance of the load end (or power supply end), or the transformer circuit itself operates in a step-down discharge (or step-down charging) power supply mode, the central control system can send a corresponding reset signal to the voltage conversion device. When the voltage conversion device acquires, receives, or detects the reset signal from the external central control system, it can re-conduct the normally-on switch based on the indication of the reset signal from the external central control system (or maintain the normally-on or off state of the normally-on switch based on the step-down discharge or step-down charging power supply mode), promptly restoring the electrical connection between the power supply and the load, avoiding power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load, ensuring stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0031] In conjunction with the second possible implementation of the third aspect, in the third possible implementation, after detecting the input voltage value, the output voltage value, and the first sampled current value of the transformer circuit, the method further includes: outputting a voltage comparison signal based on the magnitude relationship between the input voltage value and the output voltage value of the transformer circuit; and outputting a first current comparison signal based on the magnitude relationship between the first sampled current value and a first current reference value. Here, the first sampled current value is the current value at the first sampling point. The normally-on switch is controlled to turn on or off based on the voltage comparison signal and the first current comparison signal.

[0032] In this application, the comparison module (which may consist of a comparison circuit or a circuit with comparison functionality) can output a voltage comparison signal based on the relationship between the input and output voltages of the transformer circuit, and can also output a first current comparison signal based on the relationship between the first sampled current value and the first current reference value. The logic control module (which may consist of a logic control circuit (e.g., an AND gate, NAND gate, etc.) or a circuit with logic judgment functionality) can control the normally-on switch to be turned on or off based on the voltage comparison signal and the first current comparison signal. It is understood that the voltage conversion device can determine the operating state of the power supply system based on the relationship between the first sampled current value and the first current reference value. When the power supply system is operating normally (e.g., the input voltage of the transformer circuit is less than the output voltage), the voltage conversion device can keep the normally-on switch in the transformer circuit on to maintain the electrical connection between the power supply and the load. When a power supply system fault occurs (e.g., a short circuit or excessive load) causing the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive, the voltage conversion device can turn off the normally-on switch in the transformer circuit to disconnect the electrical connection between the power supply and the load. Simultaneously, it can be understood that after the power supply system fault is cleared (e.g., the input voltage of the transformer circuit is less than the output voltage) or when the current value in the power supply system is within a safe range, the voltage conversion device can re-turn on the normally-on switch to promptly restore the electrical connection between the power supply and the load, preventing power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load. This ensures stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0033] By employing this application, the voltage conversion device can maintain the normally-on switching transistor in the transformer circuit during normal operation of the power supply system (e.g., when the input voltage of the transformer circuit is less than the output voltage), thereby maintaining the electrical connection between the power supply and the load. When a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive, the voltage conversion device can promptly turn off the normally-on switching transistor to disconnect the electrical connection between the power supply and the load. The voltage conversion device can also re-engage the normally-on switching transistor after the power supply system fault is cleared or when the current value in the power supply system is within a safe range, promptly restoring the electrical connection between the power supply and the load, and preventing power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load. The voltage conversion device can improve system safety while ensuring stable system operation, is easy to control, responds quickly, has strong applicability, and has high control efficiency.

[0034] In conjunction with the third possible implementation of the third aspect, in the fourth possible implementation, a first current comparison signal is output based on the relationship between the first sampled current value and the first current reference value, including: outputting a first current comparison signal based on the relationship between the first sampled current value, the first current reset value, and the first current reference value. It can be understood that the comparison module here can also output a first current comparison signal based on the relationship between the first sampled current value, the first current reset value, and the first current reference value. Furthermore, the logic control module (here, the logic control module can be composed of logic control circuits (e.g., AND gates, NAND gates, etc.) or circuits with logic judgment functions) can control the normally-on switch to be turned on or off based on the voltage comparison signal and the first current comparison signal. That is to say, the voltage conversion device here can re-conduct the normally-on switch when the power supply system fault is cleared or when the current value in the power supply system is within a safe range (e.g., the first sampled current value is less than or equal to the first current reset value), promptly restoring the electrical connection between the power supply and the load, avoiding power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load, ensuring stable system operation, simple control, rapid response, strong applicability, and high control efficiency. At the same time, the first current reset value is less than the first current reference value, which can avoid the control circuit frequently controlling the normally on switch to switch off or switch from off to on, thus extending the service life of the component.

[0035] In conjunction with the fourth possible implementation of the third aspect, in the fifth possible implementation, after detecting the input voltage value, output voltage value, and first sampling current value of the transformer circuit, the method further includes: detecting a second sampling current value. Here, the second sampling current value includes the input current value, output current value, input current value, and / or output current value of the inductor. A second current comparison signal is output based on the relationship between the second sampling current value and the second current reference value. Here, the second sampling current value is the current value at the second sampling point. It can be understood that during the process of the transformer circuit using a boost discharge mode to raise the voltage of the power supply to a voltage matching the load to supply power to the load, the first switching transistor in the transformer circuit acts as a normally-on switching transistor, and the fourth switching transistor acts as the main switching transistor. During the process of the transformer circuit using a boost charging mode to raise the voltage of the load to a voltage matching the power supply to supply power to the power supply, the third switching transistor in the transformer circuit acts as a normally-on switching transistor, and the second switching transistor acts as the main switching transistor. In scenarios where the power supply mode switching of the transformer circuit is frequent, or in other application scenarios, the comparison module can output a first current comparison signal based not only on the relationship between the first sampled current value and the first current reference value, but also on the relationship between the second sampled current value and the second current reference value. Here, the first sampled current value can be the current value at a first sampling point set with the first switch transistor as a normally-on switch transistor, and the second sampled current value can be the current value at a second sampling point set with the third switch transistor as a normally-on switch transistor. Alternatively, the first sampled current value can be the current value at a first sampling point set with the third switch transistor as a normally-on switch transistor, and the second sampled current value at a second sampling point set with the first switch transistor as a normally-on switch transistor; the specific value can be determined according to the application scenario. In other words, when the transformer circuit is in a certain power supply mode (e.g., boost discharge mode or boost charge mode), if a fault occurs in the power supply system (e.g., short circuit or overload at the load end, or short circuit or overload at the power supply end), causing the actual output voltage of the transformer circuit to be less than or equal to the input voltage of the transformer circuit, and the current in the power supply system to be too large (e.g., the first sampling current value is greater than or equal to the first current reference value, or the second sampling current value is greater than or equal to the second current reference value), the voltage conversion device can turn off the normally on switching transistor in the transformer circuit (e.g., the first switching transistor, or the third switching transistor) to disconnect the electrical connection between the power supply and the load.

[0036] Using this application, the voltage conversion device can determine the operating status of the power supply system based on the relationship between the input and output voltages of the transformer circuit, as well as the relationship between the first sampled current value and the first current reference value, and the relationship between the second sampled current value and the second current reference value. When the transformer circuit uses different power supply modes, if a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive, the voltage conversion device can turn off the normally-on switching transistor in the transformer circuit under the current power supply mode to disconnect the electrical connection between the power supply and the load, thereby improving system safety, providing rapid response, simple structure, convenient control method, strong applicability, extending component lifespan, and reducing costs.

[0037] In conjunction with the fifth possible implementation of the third aspect, in the sixth possible implementation, a second current comparison signal is output based on the relationship between the second sampled current value and the second current reference value, including: outputting the second current comparison signal based on the relationship between the second sampled current value, the second current reset value, and the second current reference value. Here, the second current reset value is less than the second current reference value. It can be understood that in scenarios where the power supply mode switching of the transformer circuit is frequent or in other application scenarios, the comparison module can output not only the first current comparison signal based on the relationship between the first sampled current value, the first current reference value, and the first current reset value, but also the second current comparison signal based on the relationship between the second sampled current value, the second current reference value, and the second current reset value. Here, the first sampled current value can be the current value at the first sampling point set for the first switching transistor as a normally-on switching transistor, and the second sampled current value is the current value at the second sampling point set for the third switching transistor as a normally-on switching transistor. Alternatively, the first sampled current value can be the current value at the first sampling point set for the third switching transistor as a normally-on switching transistor, and the second sampled current value can be the current value at the second sampling point set for the first switching transistor as a normally-on switching transistor; the specific value can be determined according to the application scenario. In other words, when the transformer circuit is in a certain power supply mode (e.g., boost discharge mode or boost charging mode), if the power supply system fault has been eliminated or the current value in the power supply system is within a safe range (e.g., the first sampled current value is less than or equal to the first current reset value, or the second sampled current value is less than or equal to the second current reset value), the voltage conversion device can re-turn on the normally-on switching transistor in the transformer circuit (e.g., the first switching transistor or the third switching transistor), promptly restoring the electrical connection between the power supply and the load. This avoids power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load, ensuring stable system operation, simple control, rapid response, strong applicability, and high control efficiency. Simultaneously, the first current reset value being less than the first current reference value and the second current reset value being less than the second current reference value can prevent the control circuit from frequently switching the normally-on switching transistor from on to off, or from off to on, extending the component's lifespan.

[0038] In conjunction with the sixth possible implementation of the third aspect, in the seventh possible implementation, after detecting the input voltage value of the transformer circuit, the output voltage value of the transformer circuit, and the first sampled current value, the method further includes: outputting a target enable control signal based on a voltage comparison signal and a target current comparison signal. Here, the target current comparison signal and the target enable control signal are a first current comparison signal and a first enable control signal, or a second current comparison signal and a second enable control signal. Based on the target enable control signal and the drive signal of the target normally-on switch input from the external central control system, the target normally-on switch is controlled to be turned on or off. Here, the target enable control signal and the target normally-on switch are a first enable control signal and a first switch, or a second enable control signal and a third switch. It can be understood that the voltage conversion device can determine the operating status of the power supply system based on the voltage comparison signal and the target current comparison signal (e.g., the relationship between the first sampled current value, the first current reference value, and the first current reset value, or the relationship between the second sampled current value, the second current reference value, and the second current reset value). When the power supply system is operating normally (e.g., the input voltage of the transformer circuit is less than the output voltage), the voltage conversion device can output a target enable control signal (e.g., a first enable control signal or a second enable control signal) to keep the normally-on switching transistors (e.g., a first switching transistor or a third switching transistor) in the transformer circuit on to maintain the electrical connection between the power supply and the load. When a fault occurs in the power supply system (e.g., a short-circuit fault or excessive load) causing the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive (e.g., a first sampled current value is greater than or equal to a first current reference value, or a second sampled current value is greater than or equal to a second current reference value), the voltage conversion device can output a target enable control signal (e.g., a first enable control signal or a second enable control signal) to turn off the normally-on switching transistors (e.g., a first switching transistor or a third switching transistor) in the transformer circuit to disconnect the electrical connection between the power supply and the load. It can also be understood that after a power supply system fault is cleared (e.g., the input voltage of the transformer circuit is less than the output voltage) or when the current value in the power supply system is within a safe range (e.g., the first sampled current value is less than or equal to the first current reset value, or the second sampled current value is less than or equal to the second current reset value), the voltage conversion device can output a target enable control signal (e.g., a first enable control signal or a second enable control signal) to re-conduct the normally-on switching transistor, promptly restoring the electrical connection between the power supply and the load. This avoids power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load, ensuring stable system operation, simple control, rapid response, strong applicability, and high control efficiency. Furthermore, since the first current reset value is less than the first current reference value, and the second current reset value is less than the second current reference value, frequent switching of the normally-on switching transistor from on to off, or from off to on, by the control circuit can be avoided, extending the component's lifespan.

[0039] In conjunction with the seventh possible implementation of the third aspect, in the eighth possible implementation, a target enable control signal is output based on a voltage comparison signal and a target current comparison signal, including: outputting a target enable control signal based on a voltage comparison signal, a target current comparison signal and a reset signal from an external central control system. It is understandable that when the external central control system determines that the power supply system fault has been eliminated, or adjusts the transformer circuit to a step-down discharge (or step-down charging) power supply mode to adapt to the change in the load end (or power supply end) impedance, or when the transformer circuit itself is operating in a step-down discharge (or step-down charging) power supply mode, the central control system can send a corresponding reset signal to the voltage conversion device. When the latching reset unit acquires, receives, or detects the reset signal from the external central control system, it can output a target enable control signal based on the voltage comparison signal, the target current comparison signal, and the reset signal from the external central control system, and re-conduct the normally-on switch (or maintain the normally-on or off state of the normally-on switch based on the step-down discharge or step-down charging power supply mode), so as to restore the electrical connection between the power supply and the load in a timely manner, avoid the load end (or power supply end) from losing power due to the long-term disconnection of the power supply and the load, ensure the stable operation of the system, simplify control, respond quickly, and have strong applicability. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of an H-bridge transformer circuit provided in this application; Figure 2 This is a schematic diagram illustrating an application scenario of the voltage conversion device provided in the embodiments of this application; Figure 3 This is a schematic diagram of the voltage conversion device provided in an embodiment of this application; Figure 4 This is a schematic diagram of the control logic of the voltage conversion device provided in the embodiments of this application; Figure 5 This is a schematic diagram of the control circuit provided in an embodiment of this application; Figure 6 This is another control logic diagram of the voltage conversion device provided in the embodiments of this application; Figure 7 This is another structural schematic diagram of the voltage conversion device provided in the embodiments of this application; Figure 8 This is another structural schematic diagram of the voltage conversion device provided in the embodiments of this application; Figure 9 This is a schematic diagram of the base station power supply system provided in the embodiments of this application; Figure 10 This is a flowchart illustrating the control method provided in the embodiments of this application. Detailed Implementation

[0041] The voltage conversion device provided in this application can be applied to various fields such as new energy power generation, peak shaving and frequency regulation in traditional power generation, power supply for important equipment, and new energy vehicles. The specific application can be determined according to the actual application scenario, and no limitations are imposed here. The voltage conversion device provided in this application can also be applied to different power supply systems such as energy storage systems, uninterruptible power supply systems, and motor drive systems. The specific application can be determined according to the actual application scenario, and no limitations are imposed here. The voltage conversion device provided in this application can be adapted to different application scenarios, such as controlling transformer circuits in solar power supply environments, wind power supply environments, pure energy storage power supply environments, or other application scenarios. The following explanation will use the application scenario of controlling transformer circuits in a pure energy storage power supply environment as an example, and will not be elaborated further.

[0042] Please see Figure 2 , Figure 2 This is a schematic diagram illustrating an application scenario of the voltage conversion device provided in this application embodiment. In a pure energy storage power supply system, such as... Figure 2 As shown, the power supply system includes a voltage conversion device 1, a power supply, and a load. The voltage conversion device 1 includes a transformer circuit 11, and the power supply can be connected to the load through the transformer circuit 11. In some feasible embodiments, the power supply can supply power to the load through the transformer circuit 11. In some feasible embodiments, the load can also supply power to the power supply through the transformer circuit 11. It is understood that the power supply provided in this application is suitable for powering base station equipment in remote areas without mains power or with poor mains power, or for powering household appliances (such as refrigerators, air conditioners, etc.), and other application scenarios that power various types of electrical equipment. The specific application scenario can be determined according to the actual application scenario, and no limitations are imposed here. Furthermore, it can be understood that... Figure 2 The load in this context can include the power grid, which may include transmission lines, power transfer stations, communication base stations, or household appliances and other electrical equipment or power transmission equipment. Here, transformer circuit 11 can be an H-bridge transformer circuit; please refer to this description. Figure 1 ,like Figure 1As shown, the transformer circuit 11 may include an inductor L and four switching transistors (e.g., a first switching transistor Q1, a second switching transistor Q2, a third switching transistor Q3, and a fourth switching transistor Q4). The first and second switching transistors Q1 and Q2 are connected in series at the midpoint of the first bridge arm, and the third and fourth switching transistors Q3 and Q4 are connected in series at the midpoint of the second bridge arm. The inductor L is connected to the midpoints of both bridge arms. This transformer circuit 11 can switch between multiple power supply modes (e.g., boost discharge, buck discharge, boost charging, and buck charging) according to the application scenario. Here, in the process of the transformer circuit using boost discharge mode to raise the voltage of the power supply to a voltage matching the load to power the load, the first switching transistor Q1 in the transformer circuit acts as a normally-on switching transistor, and the fourth switching transistor Q4 acts as the main switching transistor. It is understandable that when a power supply system malfunctions (e.g., a short circuit or overload at the load end), causing the actual output voltage of the transformer circuit to be less than or equal to the input voltage, if only the fourth switch Q4, which acts as the main switch, is turned off, the power supply and load will remain electrically connected for a short period of time due to the presence of body diodes (or built-in diodes) in the switches (e.g., the third switch Q3 and the fourth switch Q4), potentially endangering the safety of electronic components in the system. Here, in the process of the transformer circuit using boost charging mode to raise the load voltage to a voltage matching the power supply, the third switch Q3 in the transformer circuit acts as a normally-on switch, and the second switch Q2 acts as the main switch. It is also understandable that when a power supply system malfunctions (e.g., a short circuit or overload at the power supply end), causing the actual output voltage of the transformer circuit to be less than or equal to the input voltage of the transformer circuit, if only the second switch Q2, which serves as the main switch, is turned off, the power supply and load will remain electrically connected for a short period of time due to the presence of a body diode (or built-in diode) in the switch (e.g., the first switch Q1 and the second switch Q2), which endangers the safety of electronic components in the system.

[0043] Here, the voltage conversion device 1 may further include a control circuit 10, which can be connected to the control terminal of the normally-on switch of the transformer circuit. The control circuit 10 can determine the operating status of the power supply system based on the relationship between the input voltage and output voltage of the transformer circuit 11, and simultaneously based on the relationship between the first sampled current value and the first current reference value. Here, the first sampled current value may include the input current value of the transformer circuit 11, the output current value of the transformer circuit 11, the input current value of the inductor L, and / or the output current value of the inductor L. When a fault occurs in the power supply system causing the input voltage of the transformer circuit 11 to be greater than or equal to the output voltage and the current in the power supply system to be excessive (e.g., the first sampled current value is greater than or equal to the first current reference value), the control circuit 10 can turn off the normally-on switch in the transformer circuit to disconnect the electrical connection between the power supply and the load.

[0044] By employing this application, the voltage conversion device can promptly shut off the normally-on switching transistor when a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive, thereby cutting off the electrical connection between the power supply and the load, improving system safety, providing rapid response, simple structure, convenient control method, strong applicability, extending component life, and reducing costs.

[0045] The following will combine Figures 3 to 10 The voltage conversion device provided in this application and its working principle are illustrated by examples.

[0046] Please see Figure 3 , Figure 3 This is a schematic diagram of the voltage conversion device provided in an embodiment of this application. Figure 3 As shown, the voltage conversion device includes a control circuit 20 and a transformer circuit. Here, the two ends of the transformer circuit are connected to the power supply and the load, respectively. The control circuit 20 is connected to the control terminal of the normally-on switch of the transformer circuit. The normally-on switch is either the first switch Q1 or the third switch Q3. For ease of description, this figure only uses the first switch Q1 as an example. The control circuit 20 is also used to re-conduct the normally-on switch after turning off the normally-on switch when the input voltage is less than the output voltage, or when the first sampled current is less than or equal to the first current reset value. Here, the first current reset value is less than the first current reference value. The first current reset value and the first current reference value can be calculated by an external central control system and sent to the control circuit 20, or they can be values ​​calculated by the control circuit 20, or they can be values ​​stored in the control circuit 20. For ease of description, this figure only uses the first switch Q1 as an example. Figure 3Five input ports are exemplarily shown on the left side of the control circuit 20, representing the input voltage value of the transformer circuit, the output voltage value of the transformer circuit, the first sampled current value, the first current reference value, and the first current reset value that the control circuit 20 can obtain (e.g., through acquisition, sampling, receiving, detection, or storage). The input ports are merely for visually illustrating that the control circuit 20 can obtain the corresponding signals (or parameters). In practical applications, the signals (or parameters) transmitted through these ports may exist in other forms (e.g., stored in the control circuit 20), and these situations also fall within the scope of this application. All input ports shown in the following figures are for visually illustrating that the control circuit (or other modules) can obtain multiple signals (or parameters). In practical applications, the signals (or parameters) transmitted through these ports may exist in other forms (e.g., stored in the control circuit or corresponding modules), and these situations also fall within the scope of this application, and will not be elaborated further below. Here, the control circuit 20 can re-conduct the normally-on switching transistor (e.g., the first switching transistor Q1) after the power supply system fault is cleared or the current value in the power supply system is within a safe range (e.g., the first sampled current value is less than or equal to the first current reset value), thus promptly restoring the electrical connection between the power supply and the load. This prevents power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load, ensuring stable system operation. The control is simple, responsive, highly applicable, and efficient. Simultaneously, the first current reset value being less than the first current reference value avoids frequent switching of the normally-on switching transistor from on to off, or from off to on, extending the component's lifespan.

[0047] For some feasible implementations, please refer to further details. Figure 3 ,like Figure 3 An input port is illustrated below the control circuit 20 (e.g., ...). Figure 3(As shown by the dashed line). Here, the control circuit 20 can obtain the reset signal from the external central control system (by means of, for example, acquiring, collecting, receiving, detecting, or storing). Here, the control circuit 20 is also used to, after turning off the normally on switch, re-turn on the normally on switch (e.g., the first switch Q1) based on the reset signal from the external central control system. Here, when the external central control system determines that the power supply system fault has been eliminated, or adjusts the transformer circuit to a step-down discharge (or step-down charging) power supply mode to adapt to changes in the load (or power supply) impedance, or when the transformer circuit itself is operating in a step-down discharge (or step-down charging) power supply mode, the central control system can send a corresponding reset signal to the voltage conversion device. When the voltage conversion device acquires, receives, or detects the reset signal from the external central control system, it can re-conduct the normally-on switch based on the indication of the reset signal from the external central control system (or maintain the normally-on or off state of the normally-on switch based on the step-down discharge or step-down charging power supply mode), promptly restoring the electrical connection between the power supply and the load, avoiding power loss at the load (or power supply) due to prolonged disconnection of the power supply and load, ensuring stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0048] To more intuitively illustrate the control logic of the control circuit, please refer to [the relevant documentation / reference]. Figure 4 , Figure 4 This is a schematic diagram of the control logic of the voltage conversion device provided in an embodiment of this application. For ease of description, Figure 4 This explanation focuses on the case where only the transformer circuit performs boost discharge, supplying power to the load via a power source; that is, the fourth switch Q4 is the main switch, and the first switch Q1 is a normally-on switch. For example... Figure 4 As shown, the comparison result between the first sampled current value I1 and the first current reference value Iref1 is Icomp1. Icomp1 is high when the first sampled current value I1 is greater than or equal to the first current reference value Iref1, and low when the first sampled current value I1 is less than the first current reference value Iref1. Figure 4In the diagram, the clock signal (clk signal) and the reset signal together form the reset signal for the external central control system. When both the reset and clk signals are high, it indicates that the reset signal indicates the normally open switching transistor. It can be understood that the reset signal here can also be the reset signal alone (not shown in the control logic diagram, it can be set to be active high, active low, active on rising edge, or active on falling edge, etc.). The comparison result between the input voltage and output voltage of the transformer circuit is Vcomp. Vcomp is high when the input voltage is greater than or equal to the output voltage, and low when the input voltage is less than the output voltage. Q4 and Q1 represent the on and off states of the fourth and first switching transistors, respectively, with high indicating on and low indicating off. Figure 4 As shown, before time t4, since the input voltage of the transformer circuit is always less than the output voltage (Vcomp is low), the transformer circuit operates normally in boost discharge mode, and the normally-on switch (i.e., the first switch Q1) is always in the on state (high level). At time t5, since the input voltage of the transformer circuit is greater than or equal to the output voltage (Vcomp is high), and the first sampled current value I1 is greater than or equal to the first current reference value Iref1 (Icomp1 is high), the control circuit turns off the normally-on switch (i.e., the first switch Q1 is low). At time t6, the reset signal (the reset signal and the clk signal are both high) instructs the control circuit to re-conduct the normally-on switch (i.e., the first switch Q1 is high again). Figure 4 The control logic at times t7 and t8 is the same as that at times t5 and t6, and will not be repeated here. Figure 4 The control logic shown is only one implementation of the present application. It can be applied to situations where the system has not completely eliminated the fault, but in order to avoid the system power failure time (i.e., the time when the load and power supply are disconnected from the electrical connection) being too long and thus killing the entire power supply system, the electrical connection between the power supply and the load can be temporarily restored by a reset signal. It can be understood that at time t7 after time t6, the control circuit can turn off the normally on switch (i.e., the first switch Q1) again. Figure 4 The control logic shown at time t6 can also be applied when the system adjusts the transformer circuit to a step-down discharge power supply mode to adapt to changes in load impedance, or when the transformer circuit itself is operating in a step-down discharge power supply mode. In this case, the central control system can send a corresponding reset signal to the voltage conversion device. At this time, the main switch is the first switch Q1, and the fourth switch Q4 is a normally off switch (and...). Figure 4Unlike other time intervals, Q4 is at a low level after time t6. It can be seen that after time t6 (e.g., time t7 and time t8), the turn-on and turn-off waveforms of the first switch Q1 can be controlled by the reset signal to be the turn-on and turn-off waveforms of the main switch. The control logic provided in this application can also be applied to the transformer circuit in the step-down discharge power supply mode.

[0049] In some feasible implementations, the control circuit may include a comparison module and a logic control module. See also... Figure 5 , Figure 5 This is a schematic diagram of the control circuit provided in an embodiment of this application. Figure 5 As shown, the control circuit 20 includes a comparison module 201 and a logic control module 202. The input terminal of the comparison module 201 is connected to the input terminal of the transformer circuit, the output terminal of the transformer circuit, and the first sampling point. The output terminal of the comparison module 201 is connected to the control terminal of the normally-on switching transistor through the logic control module 202. Here, the first sampling point includes the input terminal of the transformer circuit, the output terminal of the transformer circuit, the output terminal of the inductor L, and / or the input terminal of the inductor L. The comparison module 201 is used to output a voltage comparison signal based on the relationship between the input voltage value Vin and the output voltage value Vout of the transformer circuit (e.g., ...). Figure 4 (Vcomp in the text). The comparison module 201 here is also used to output a first current comparison signal based on the relationship between the first sampled current value I1 and the first current reference value Iref1 (e.g., Vcomp in the text). Figure 4 (Icomp1 in the original text). Here, the first sampled current value I1 is the current value at the first sampling point. The logic control module 202 here is used to control the normally on switch to turn on or off based on the voltage comparison signal and the first current comparison signal.

[0050] In this application, the comparison module 201 (which may consist of a comparison circuit or a circuit with comparison function) can output a voltage comparison signal based on the relationship between the input voltage Vin and the output voltage Vout of the transformer circuit, and can also output a first current comparison signal based on the relationship between the first sampled current value I1 and the first current reference value Iref1. The logic control module 202 (which may consist of a logic control circuit 20 (e.g., an AND gate, NAND gate, etc.) or a circuit with logic judgment function) can control the normally on switch to be turned on or off based on the voltage comparison signal and the first current comparison signal. It can be understood that the voltage conversion device can determine the operating state of the power supply system based on the relationship between the first sampled current value I1 and the first current reference value Iref1. When the power supply system is operating normally (e.g., the input voltage Vin of the transformer circuit is less than the output voltage Vout), the voltage conversion device can keep the normally on switch in the transformer circuit on to maintain the electrical connection between the power supply and the load. When a power supply system fault occurs (e.g., a short circuit or excessive load) causing the input voltage Vin of the transformer circuit to be greater than or equal to the output voltage Vout and the current in the power supply system to be excessive, the voltage conversion device can turn off the normally-on switch in the transformer circuit to disconnect the electrical connection between the power supply and the load. Simultaneously, it can be understood that after the power supply system fault is cleared (e.g., the input voltage of the transformer circuit is less than the output voltage) or when the current in the power supply system is within a safe range, the voltage conversion device can re-turn on the normally-on switch to promptly restore the electrical connection between the power supply and the load, preventing power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load. This ensures stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0051] By employing this application, the voltage conversion device can maintain the normally-on switching transistor in the transformer circuit during normal operation of the power supply system (e.g., when the input voltage of the transformer circuit is less than the output voltage), thereby maintaining the electrical connection between the power supply and the load. When a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive, the voltage conversion device can promptly turn off the normally-on switching transistor to disconnect the electrical connection between the power supply and the load. The voltage conversion device can also re-engage the normally-on switching transistor after the power supply system fault is cleared or when the current value in the power supply system is within a safe range, promptly restoring the electrical connection between the power supply and the load, and preventing power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load. The voltage conversion device can improve system safety while ensuring stable system operation, is easy to control, responds quickly, has strong applicability, and has high control efficiency.

[0052] In some feasible implementations, the comparison module 201 can also obtain (through methods such as acquisition, collection, reception, detection, or storage) a first sampled current value I1, a first current reset value Irec1, and a first current reference value Iref1. Here, the comparison module 201 can also output a first current comparison signal based on the magnitude relationship between the first sampled current value I1, the first current reset value Irec1, and the first current reference value Iref1. Furthermore, the logic control module (which can consist of a logic control circuit (e.g., an AND gate, a NAND gate, etc.) or a circuit with logic judgment functions) can control the normally on switch to be turned on or off based on the voltage comparison signal and the first current comparison signal. In other words, the voltage conversion device here can re-conduct the switching transistor after the power supply system fault is cleared or when the current value in the power supply system is within a safe range (for example, the first sampling current value I1 is less than or equal to the first current reset value Irec1), so as to restore the electrical connection between the power supply and the load in a timely manner, avoid the load end (or power supply end) from being disconnected for a long time due to the power supply and the load, ensure the stable operation of the system, and is easy to control, has a fast response, strong applicability, and high control efficiency.

[0053] To more intuitively illustrate the control logic of the control circuit, please refer to [the relevant documentation / reference]. Figure 6 , Figure 6 This is another control logic diagram of the voltage conversion device provided in the embodiments of this application. For ease of description, Figure 6 This explanation focuses on the case where only the transformer circuit performs boost discharge, supplying power to the load via a power source; that is, the fourth switch Q4 is the main switch, and the first switch Q1 is a normally-on switch. For example... Figure 6 As shown, the comparison result between the first sampled current value I1 and the first current reference value Iref1 is Icomp1. Icomp1 is high when the first sampled current value I1 is greater than or equal to the first current reference value Iref1, and low when the first sampled current value I1 is less than the first current reference value Iref1. Figure 6 In this circuit, the first current reset value is Irec1. The comparison result between the input voltage and output voltage of the transformer circuit is Vcomp. Vcomp is high when the input voltage is greater than or equal to the output voltage, and low when the input voltage is less than the output voltage. Q4 and Q1 represent the on and off states of the fourth and first switches, respectively, with high indicating on and low indicating off. Figure 4As shown, before time t4, since the input voltage of the transformer circuit is always less than the output voltage (Vcomp is low), the transformer circuit operates normally in boost discharge mode, and the normally-on switch (i.e., the first switch Q1) is always in the on state (high level). At time t5, since the input voltage of the transformer circuit is greater than or equal to the output voltage (Vcomp is high), and the first sampled current value I1 is greater than or equal to the first current reference value Iref1 (Icomp1 is high), the control circuit turns off the normally-on switch (i.e., the first switch Q1 is low). At time t6, since the first sampled current value I1 is less than or equal to the first current reset value Irec1, the control circuit re-conducts the normally-on switch (i.e., the first switch Q1 is high again). Figure 6 The control logic at times t8 and t9 is the same as that at times t5 and t6, and will not be repeated here. Figure 6 The control logic shown is only one implementation of the present application. It can be applied to situations where the system has not completely eliminated the fault, but in order to avoid the system power failure time (i.e., the time when the load and power supply are disconnected from the electrical connection) being too long and thus killing the entire power supply system, the electrical connection between the power supply and the load can be temporarily restored by a reset signal. It can be understood that at time t8 after time t6, the control circuit can turn off the normally on switch (i.e., the first switch Q1) again.

[0054] In some feasible implementations, the transformer circuit can switch between multiple power supply modes (e.g., boost discharge, buck discharge, boost charging, and buck charging) depending on the application scenario. The external central control system can directly or through a drive circuit provide different drive signals to the transformer circuit's switching transistors to control the transformer circuit in different power supply modes. For example, when the external central control system uses the fourth switching transistor Q4 as the main switching transistor and inputs the corresponding drive signal for the main switching transistor, the transformer circuit is in boost discharge mode, supplying power to the load through the power supply. In this case, the first switching transistor Q1 acts as a normally-on switching transistor. As another example, when the external central control system uses the second switching transistor Q2 as the main switching transistor and inputs the corresponding drive signal for the main switching transistor, the transformer circuit is in boost charging mode, supplying power to the load through the power supply. In this case, the third switching transistor Q3 acts as a normally-on switching transistor. Here, the voltage conversion device can determine the power supply mode of the transformer circuit based on the drive signal of the main switching transistor input by the external central control system. Then, when the transformer circuit is in different power supply modes, it controls the conduction or cutoff of the normally on switching transistor in the current power supply mode. The control is simple, the response is fast, and the applicability is strong.

[0055] Please see details. Figure 7 , Figure 7 This is another structural schematic diagram of the voltage conversion device provided in the embodiments of this application. For example... Figure 7As shown, the control circuit 30 may include a comparison module 301 and a logic control module 302. The logic control module 302 can be connected to the control terminal of the first switch Q1 and / or the control terminal of the third switch Q3 in the transformer circuit. The input terminal of the comparison module 301 can be connected to the input terminal of the transformer circuit, the output terminal of the transformer circuit, the first sampling point, and the second sampling point. The second sampling point includes the input terminal of the transformer circuit, the output terminal of the transformer circuit, the output terminal of the inductor L, and / or the input terminal of the inductor L. The comparison module 301 is also used to output a second current comparison signal based on the relationship between the second sampled current value I2 and the second current reference value Iref2. Here, the second sampled current value I2 is the current value at the second sampling point. It can be understood that during the process of the transformer circuit using a boost discharge mode to raise the voltage of the power supply to a voltage matching the load to supply power to the load, the first switch Q1 in the transformer circuit acts as a normally-on switch, and the fourth switch Q4 acts as the main switch. In the process of boosting the load voltage to a voltage that matches the power supply in the transformer circuit using the boost charging mode to supply power, the third switch Q3 in the transformer circuit acts as a normally-on switch, and the second switch Q2 acts as the main switch.

[0056] Furthermore, in some application scenarios (e.g., scenarios where the power supply mode switching of the transformer circuit is relatively frequent), the comparison module can not only output a first current comparison signal based on the relationship between the first sampled current value I1 and the first current reference value Iref1, but also output a second current comparison signal based on the relationship between the second sampled current value I2 and the second current reference value Iref2. Here, the first sampled current value I1 can be the current value at the first sampling point set with the first switch Q1 as a normally-on switch, and the second sampled current value I2 can be the current value at the second sampling point set with the third switch Q3 as a normally-on switch. Alternatively, the first sampled current value I1 can be the current value at the first sampling point set with the third switch Q3 as a normally-on switch, and the second sampled current value I2 can be the current value at the second sampling point set with the first switch Q1 as a normally-on switch; the specific value can be determined according to the application scenario. In other words, when the transformer circuit is in a certain power supply mode (e.g., boost discharge mode or boost charge mode), if a fault occurs in the power supply system (e.g., short circuit or overload at the load end, or short circuit or overload at the power supply end), causing the actual output voltage Vout of the transformer circuit to be less than or equal to the input voltage Vin of the transformer circuit, and the current in the power supply system to be too large (e.g., the first sampling current value I1 is greater than or equal to the first current reference value Iref1, or the second sampling current value I2 is greater than or equal to the second current reference value Iref2), the voltage conversion device can turn off the normally on switching transistor in the transformer circuit (e.g., the first switching transistor Q1, or the third switching transistor Q3) to disconnect the electrical connection between the power supply and the load.

[0057] Using this application, the voltage conversion device can determine the operating status of the power supply system based on the relationship between the input voltage Vin and the output voltage Vout of the transformer circuit, as well as the relationship between the first sampled current value I1 and the first current reference value Iref1, and the relationship between the second sampled current value I2 and the second current reference value Iref2. When the transformer circuit adopts different power supply modes, if a fault in the power supply system causes the input voltage Vin of the transformer circuit to be greater than or equal to the output voltage Vout and the current in the power supply system to be too large, the voltage conversion device can turn off the normally on switching transistor in the transformer circuit under the current power supply mode to disconnect the electrical connection between the power supply and the load, thereby improving system safety, providing rapid response, simple structure, convenient control method, strong applicability, extending component life, and reducing costs.

[0058] In some feasible implementations, the comparison module 301 is also used to output a second current comparison signal based on the relationship between the second sampled current value I2, the second current reset value Irec2, and the second current reference value Iref2. Here, the second current reset value Irec2 is less than the second current reference value Iref2. It can be understood that in scenarios where the power supply mode switching of the transformer circuit is relatively frequent or in other application scenarios, the comparison module 301 can not only output a first current comparison signal based on the relationship between the first sampled current value I1, the first current reference value Iref1, and the first current reset value Irec1, but also output a second current comparison signal based on the relationship between the second sampled current value I2, the second current reference value Iref2, and the second current reset value Irec2. Here, the first sampled current value I1 can be the current value of the first sampling point set for the first switching transistor Q1 as a normally on switching transistor, and the second sampled current value I2 is the current value of the second sampling point set for the third switching transistor Q3 as a normally on switching transistor. Here, the first sampling current value I1 can also be the current value at the first sampling point set with the third switch Q3 as a normally-on switch, and the second sampling current value I2 is the current value at the second sampling point set with the first switch Q1 as a normally-on switch. The specific value can be determined according to the application scenario. That is to say, when the transformer circuit is in a certain power supply mode (e.g., boost discharge mode or boost charging mode), if the power supply system fault has been eliminated or the current value in the power supply system is within a safe range (e.g., the first sampling current value I1 is less than or equal to the first current reset value Irec1, or the second sampling current value I2 is less than or equal to the second current reset value Irec2), the voltage conversion device can re-turn on the normally-on switch in the transformer circuit (e.g., the first switch Q1, or the third switch Q3), promptly restore the electrical connection between the power supply and the load, avoid power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load, ensure stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0059] In some feasible implementations, the logic control module may include a latch reset unit and a drive control unit. See details below. Figure 8 , Figure 8 This is another structural schematic diagram of the voltage conversion device provided in the embodiments of this application. For example... Figure 8As shown, the logic control module 402 of the control circuit 40 may include a latch reset unit 4021 and a drive control unit 4022. Here, the output of the comparison module 401 can be connected to the drive control unit 4022 via the latch reset unit 4021. The latch reset unit 4021 is used to output a target enable control signal based on a voltage comparison signal and a target current comparison signal. Here, the target current comparison signal and the target enable control signal are either a first current comparison signal and a first enable control signal, or a second current comparison signal and a second enable control signal. The drive control unit 4022 is used to control the target normally-on switch to be turned on or off based on the target enable control signal and the drive signal of the target normally-on switch input from the external central control system. Here, the target enable control signal and the target normally-on switch are either a first enable control signal and a first switch Q1, or a second enable control signal and a third switch Q3. It is understood that the voltage conversion device can determine the operating status of the power supply system based on the voltage comparison signal and the target current comparison signal (e.g., the relationship between the first sampled current value I1, the first current reference value Iref1, and the first current reset value Irec1, or the relationship between the second sampled current value I2, the second current reference value Iref2, and the second current reset value Irec2). When the power supply system is operating normally (e.g., the input voltage Vin of the transformer circuit is less than the output voltage Vout), the voltage conversion device can output a target enable control signal (e.g., a first enable control signal or a second enable control signal) to keep the normally on switching transistors (e.g., the first switching transistor Q1 or the third switching transistor Q3) in the transformer circuit on, so as to maintain the electrical connection between the power supply and the load. When a power supply system fault (e.g., a short circuit or excessive load) causes the input voltage Vin of the transformer circuit to be greater than or equal to the output voltage Vout and the current in the power supply system to be excessive (e.g., the first sampled current value I1 is greater than or equal to the first current reference value Iref1, or the second sampled current value I2 is greater than or equal to the second current reference value Iref2), the voltage conversion device can output a target enable control signal (e.g., a first enable control signal or a second enable control signal) to turn off the normally on switching transistors (e.g., the first switching transistor Q1 or the third switching transistor Q3) in the transformer circuit, thereby disconnecting the electrical connection between the power supply and the load.It can also be understood that after the power supply system fault is cleared (e.g., the input voltage Vin of the transformer circuit is less than the output voltage Vout) or the current value in the power supply system is within a safe range (e.g., the first sampling current value I1 is less than or equal to the first current reset value Irec1, or the second sampling current value I2 is less than or equal to the second current reset value Irec2), the voltage conversion device can output a target enable control signal (e.g., the first enable control signal or the second enable control signal), re-conduct the normally closed switching transistor, and promptly restore the electrical connection between the power supply and the load. This avoids power loss at the load end (or the power supply end) due to prolonged disconnection of the power supply and the load, ensuring stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0060] In some feasible implementations, the latching reset unit 4021 is also used to output a target enable control signal based on the voltage comparison signal, the target current comparison signal, and the reset signal from the external central control system. It can be understood that when the external central control system determines that the power supply system fault has been eliminated, or adjusts the transformer circuit to a step-down discharge (or step-down charging) power supply mode to adapt to changes in the load (or power supply) impedance, or when the transformer circuit itself operates in a step-down discharge (or step-down charging) power supply mode, the central control system can send a corresponding reset signal to the voltage conversion device. When the latching reset unit 4021 acquires, receives, or detects the reset signal from the external central control system, it can output a target enable control signal based on the voltage comparison signal, the target current comparison signal, and the reset signal from the external central control system, re-conducting the normally-on switch (or maintaining the normally-on or off state of the normally-on switch based on the step-down discharge or step-down charging power supply mode), promptly restoring the electrical connection between the power supply and the load, avoiding power loss at the load (or power supply) due to prolonged disconnection of the power supply and load, ensuring stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0061] In some feasible implementation methods, please refer to the following: Figure 9 , Figure 9 This is a schematic diagram of the base station power supply system provided in an embodiment of this application. Figure 9 As shown, the base station power supply system also includes a power supply and a voltage conversion device, the voltage conversion device being suitable for the aforementioned... Figures 2 to 8 Any power supply system or voltage conversion device in the power supply system shown, Figure 9 China only Figure 2 The voltage conversion device shown is used as an example for illustration. It can be understood that, in... Figure 9In the base station power supply system shown, each transformer circuit in multiple voltage conversion devices (e.g., voltage conversion device a-voltage conversion device n) corresponds one-to-one with each control circuit in multiple voltage conversion devices. The power supply is connected to the load after the transformer circuits in multiple voltage conversion devices are connected in parallel.

[0062] By adopting this application, when a fault occurs in the base station power supply system, causing the input voltage Vin of the transformer circuit in one of the multiple voltage conversion devices to be greater than or equal to the output voltage Vout and the current in the power supply system to be too large, the voltage conversion device can promptly turn off the normally on switching transistor to disconnect the electrical connection between part of the power supply and the load of the voltage conversion device. This can enrich the application scenarios, improve the system safety, extend the service life of components, and reduce costs.

[0063] In this application, the voltage conversion device and the functional modules in the base station power supply system are arranged in diverse and flexible ways, adaptable to different power supply environments, improving the diversity of application scenarios and enhancing the adaptability of the power supply system. Meanwhile, the above... Figures 2 to 9 Any of the power supply systems or voltage conversion devices shown can promptly shut off the normally-on switching transistor when a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive. This disconnects the electrical connection between the power supply and the load, improving system safety, providing rapid response, simple structure, convenient control method, strong applicability, extended component lifespan, and reduced cost. For ease of description, the following will use... Figure 2 The structure of the power supply system shown is used to illustrate the control method provided in the embodiments of this application.

[0064] Please see Figure 10 , Figure 10 This is a flowchart illustrating the control method provided in this application. The control method provided in this application is applicable to voltage conversion devices, including a control circuit and a transformer circuit. The two ends of the transformer circuit are connected to a power supply and a load, respectively. The control circuit is connected to the control terminal of a normally-on switching transistor in the transformer circuit. The normally-on switching transistor is either a first or a third switching transistor. This control method is also applicable to the aforementioned... Figures 1 to 7 Any power supply system or voltage conversion device within a power supply system shown. For example... Figure 10 As shown, the control method provided in this application includes the following steps: S701: Detects the input voltage value, output voltage value, and first sampling current value of the transformer circuit.

[0065] S702: When the input voltage of the transformer circuit is greater than or equal to the output voltage of the transformer circuit, and the first sampling current value is greater than or equal to the first current reference value, the normally on switch is turned off.

[0066] In the embodiments provided in this application, the voltage conversion device can determine the operating status of the power supply system based on the relationship between the input voltage and output voltage of the transformer circuit, and simultaneously based on the relationship between the first sampled current value and the first current reference value. When a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive (e.g., the first sampled current value is greater than or equal to the first current reference value), the voltage conversion device can turn off the normally on switch in the transformer circuit to disconnect the electrical connection between the power supply and the load. Here, the control circuit in the voltage conversion device can turn off the normally on switch when the input voltage value of the transformer circuit is greater than or equal to the output voltage value of the transformer circuit, and the first sampled current value of the transformer circuit is greater than or equal to the first current reference value, to disconnect the electrical connection between the load and the power supply. Here, the first sampled current value may include the input current value of the transformer circuit, the output current value of the transformer circuit, the input current value of the inductor, and / or the output current value of the inductor.

[0067] By employing this application, the voltage conversion device can promptly shut off the normally-on switching transistor when a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive, thereby cutting off the electrical connection between the power supply and the load, improving system safety, providing rapid response, simple structure, convenient control method, strong applicability, extending component life, and reducing costs.

[0068] In some feasible implementations, after turning off the normally-on switch in step S702, the method may further include: re-turning the normally-on switch when the input voltage value is less than the output voltage value, or when the first sampled current value is less than or equal to the first current reset value. Here, the first current reset value is less than the first current reference value. Here, the voltage conversion device can re-turn the normally-on switch after the power supply system fault is cleared or when the current value in the power supply system is within a safe range (e.g., the first sampled current value is less than or equal to the first current reset value), promptly restoring the electrical connection between the power supply and the load, avoiding power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load, ensuring stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0069] In some feasible implementations, after turning off the normally-on switch in step S702, the method may further include: re-energizing the normally-on switch based on a reset signal from the external central control system. Here, when the external central control system determines that the power supply system fault has been eliminated, or adjusts the transformer circuit to a step-down discharge (or step-down charging) power supply mode to adapt to changes in the load (or power supply) impedance, or when the transformer circuit itself operates in a step-down discharge (or step-down charging) power supply mode, the central control system can send a corresponding reset signal to the voltage conversion device. When the voltage conversion device acquires, receives, or detects the reset signal from the external central control system, it can re-energize the normally-on switch based on the reset signal from the external central control system (or maintain the normally-on or off state of the normally-on switch based on the step-down discharge or step-down charging power supply mode), promptly restoring the electrical connection between the power supply and the load, avoiding power loss at the load (or power supply) due to prolonged disconnection of the power supply and load, ensuring stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0070] In some feasible implementations, after detecting the input voltage value, output voltage value, and first sampled current value of the transformer circuit in step S701, the method further includes: outputting a voltage comparison signal based on the magnitude relationship between the input voltage value and the output voltage value of the transformer circuit; and outputting a first current comparison signal based on the magnitude relationship between the first sampled current value and a first current reference value. Here, the first sampled current value is the current value at the first sampling point. The normally-on switch is controlled to turn on or off based on the voltage comparison signal and the first current comparison signal.

[0071] In this application, the comparison module (which may consist of a comparison circuit or a circuit with comparison functionality) can output a voltage comparison signal based on the relationship between the input and output voltages of the transformer circuit, and can also output a first current comparison signal based on the relationship between the first sampled current value and the first current reference value. The logic control module (which may consist of a logic control circuit (e.g., an AND gate, NAND gate, etc.) or a circuit with logic judgment functionality) can control the normally-on switch to be turned on or off based on the voltage comparison signal and the first current comparison signal. It is understood that the voltage conversion device can determine the operating state of the power supply system based on the relationship between the first sampled current value and the first current reference value. When the power supply system is operating normally (e.g., the input voltage of the transformer circuit is less than the output voltage), the voltage conversion device can keep the normally-on switch in the transformer circuit on to maintain the electrical connection between the power supply and the load. When a power supply system fault occurs (e.g., a short circuit or excessive load) causing the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive, the voltage conversion device can turn off the normally-on switch in the transformer circuit to disconnect the electrical connection between the power supply and the load. Simultaneously, it can be understood that after the power supply system fault is cleared (e.g., the input voltage of the transformer circuit is less than the output voltage) or when the current value in the power supply system is within a safe range, the voltage conversion device can re-turn on the normally-on switch to promptly restore the electrical connection between the power supply and the load, preventing power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load. This ensures stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0072] By employing this application, the voltage conversion device can maintain the normally-on switching transistor in the transformer circuit during normal operation of the power supply system (e.g., when the input voltage of the transformer circuit is less than the output voltage), thereby maintaining the electrical connection between the power supply and the load. When a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive, the voltage conversion device can promptly turn off the normally-on switching transistor to disconnect the electrical connection between the power supply and the load. The voltage conversion device can also re-engage the normally-on switching transistor after the power supply system fault is cleared or when the current value in the power supply system is within a safe range, promptly restoring the electrical connection between the power supply and the load, and preventing power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load. The voltage conversion device can improve system safety while ensuring stable system operation, is easy to control, responds quickly, has strong applicability, and has high control efficiency.

[0073] In some feasible implementations, a first current comparison signal is output based on the relationship between the first sampled current value and the first current reference value, including: outputting a first current comparison signal based on the relationship between the first sampled current value, the first current reset value, and the first current reference value. It can be understood that the comparison module here can also output a first current comparison signal based on the relationship between the first sampled current value, the first current reset value, and the first current reference value. Furthermore, the logic control module (here, the logic control module can be composed of logic control circuits (e.g., AND gates, NAND gates, etc.) or circuits with logic judgment functions) can control the normally-on switch to be turned on or off based on the voltage comparison signal and the first current comparison signal. That is, the voltage conversion device here can re-conduct the normally-on switch after the power supply system fault is cleared or when the current value in the power supply system is within a safe range (e.g., the first sampled current value is less than or equal to the first current reset value), promptly restoring the electrical connection between the power supply and the load, avoiding power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load, ensuring stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0074] In some feasible implementations, after detecting the input voltage value, output voltage value, and first sampled current value of the transformer circuit in step S701, the method further includes detecting a second sampled current value. Here, the second sampled current value includes the input current value, output current value, input current value, and / or output current value of the inductor. A second current comparison signal is output based on the relationship between the second sampled current value and the second current reference value. Here, the second sampled current value is the current value at the second sampling point. It can be understood that during the process of the transformer circuit using a boost discharge mode to raise the voltage of the power supply to a voltage matching the load and supply power to the load, the first switching transistor in the transformer circuit acts as a normally-on switching transistor, and the fourth switching transistor acts as the main switching transistor. During the process of the transformer circuit using a boost charging mode to raise the voltage of the load to a voltage matching the power supply and supply power to the power supply, the third switching transistor in the transformer circuit acts as a normally-on switching transistor, and the second switching transistor acts as the main switching transistor. In scenarios where the power supply mode switching of the transformer circuit is frequent, or in other application scenarios, the comparison module can output a first current comparison signal based not only on the relationship between the first sampled current value and the first current reference value, but also on the relationship between the second sampled current value and the second current reference value. Here, the first sampled current value can be the current value at a first sampling point set with the first switch transistor as a normally-on switch transistor, and the second sampled current value can be the current value at a second sampling point set with the third switch transistor as a normally-on switch transistor. Alternatively, the first sampled current value can be the current value at a first sampling point set with the third switch transistor as a normally-on switch transistor, and the second sampled current value at a second sampling point set with the first switch transistor as a normally-on switch transistor; the specific value can be determined according to the application scenario. In other words, when the transformer circuit is in a certain power supply mode (e.g., boost discharge mode or boost charge mode), if a fault occurs in the power supply system (e.g., short circuit or overload at the load end, or short circuit or overload at the power supply end), causing the actual output voltage of the transformer circuit to be less than or equal to the input voltage of the transformer circuit, and the current in the power supply system to be too large (e.g., the first sampling current value is greater than or equal to the first current reference value, or the second sampling current value is greater than or equal to the second current reference value), the voltage conversion device can turn off the normally on switching transistor in the transformer circuit (e.g., the first switching transistor, or the third switching transistor) to disconnect the electrical connection between the power supply and the load.

[0075] Using this application, the voltage conversion device can determine the operating status of the power supply system based on the relationship between the input and output voltages of the transformer circuit, as well as the relationship between the first sampled current value and the first current reference value, and the relationship between the second sampled current value and the second current reference value. When the transformer circuit uses different power supply modes, if a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive, the voltage conversion device can turn off the normally-on switching transistor in the transformer circuit under the current power supply mode to disconnect the electrical connection between the power supply and the load, thereby improving system safety, providing rapid response, simple structure, convenient control method, strong applicability, extending component lifespan, and reducing costs.

[0076] In some feasible implementations, a second current comparison signal is output based on the relationship between the second sampled current value and the second current reference value, including: outputting a second current comparison signal based on the relationship between the second sampled current value, the second current reset value, and the second current reference value. Here, the second current reset value is less than the second current reference value. It can be understood that in scenarios where the power supply mode switching of the transformer circuit is frequent or in other application scenarios, the comparison module can output not only a first current comparison signal based on the relationship between the first sampled current value, the first current reference value, and the first current reset value, but also a second current comparison signal based on the relationship between the second sampled current value, the second current reference value, and the second current reset value. Here, the first sampled current value can be the current value at a first sampling point set for the first switching transistor as a normally-on switching transistor, and the second sampled current value can be the current value at a second sampling point set for the third switching transistor as a normally-on switching transistor, and the second sampled current value can be the current value at a second sampling point set for the first switching transistor as a normally-on switching transistor; the specific value can be determined according to the application scenario. In other words, when the transformer circuit is in a certain power supply mode (e.g., boost discharge mode or boost charging mode), if the power supply system fault has been eliminated or the current value in the power supply system is within a safe range (e.g., the first sampled current value is less than or equal to the first current reset value, or the second sampled current value is less than or equal to the second current reset value), the voltage conversion device can re-turn on the normally-on switching transistor in the transformer circuit (e.g., the first switching transistor or the third switching transistor) to restore the electrical connection between the power supply and the load in a timely manner. This avoids power loss at the load end (or power supply end) due to prolonged disconnection of the power supply and load, ensuring stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0077] In some feasible implementations, after detecting the input voltage value, output voltage value, and first sampled current value of the transformer circuit in step S701, the method further includes: outputting a target enable control signal based on a voltage comparison signal and a target current comparison signal. Here, the target current comparison signal and the target enable control signal are either a first current comparison signal and a first enable control signal, or a second current comparison signal and a second enable control signal. Based on the target enable control signal and the drive signal of the target normally-on switch input from the external central control system, the target normally-on switch is controlled to be turned on or off. Here, the target enable control signal and the target normally-on switch are either a first enable control signal and a first switch, or a second enable control signal and a third switch. It can be understood that the voltage conversion device can determine the operating status of the power supply system based on the voltage comparison signal and the target current comparison signal (e.g., the relationship between the first sampled current value, the first current reference value, and the first current reset value, or the relationship between the second sampled current value, the second current reference value, and the second current reset value). When the power supply system is operating normally (e.g., the input voltage of the transformer circuit is less than the output voltage), the voltage conversion device can output a target enable control signal (e.g., a first enable control signal or a second enable control signal) to keep the normally-on switching transistors (e.g., a first switching transistor or a third switching transistor) in the transformer circuit on to maintain the electrical connection between the power supply and the load. When a fault occurs in the power supply system (e.g., a short-circuit fault or excessive load) causing the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be excessive (e.g., a first sampled current value is greater than or equal to a first current reference value, or a second sampled current value is greater than or equal to a second current reference value), the voltage conversion device can output a target enable control signal (e.g., a first enable control signal or a second enable control signal) to turn off the normally-on switching transistors (e.g., a first switching transistor or a third switching transistor) in the transformer circuit to disconnect the electrical connection between the power supply and the load. It can also be understood that after the power supply system fault is cleared (e.g., the input voltage of the transformer circuit is less than the output voltage) or the current value in the power supply system is within a safe range (e.g., the first sampled current value is less than or equal to the first current reset value, or the second sampled current value is less than or equal to the second current reset value), the voltage conversion device can output a target enable control signal (e.g., the first enable control signal or the second enable control signal) to re-conduct the normally turned-on switching transistor, promptly restore the electrical connection between the power supply and the load, avoid power loss at the load end (or the power supply end) due to prolonged disconnection of the power supply and the load, ensure stable system operation, simple control, rapid response, strong applicability, and high control efficiency.

[0078] In some feasible implementations, a target enable control signal is output based on a voltage comparison signal and a target current comparison signal, including: outputting a target enable control signal based on a voltage comparison signal, a target current comparison signal, and a reset signal from an external central control system. It can be understood that when the external central control system determines that the power supply system fault has been eliminated, or adjusts the transformer circuit to a step-down discharge (or step-down charging) power supply mode to adapt to changes in the load (or power supply) impedance, or when the transformer circuit itself operates in a step-down discharge (or step-down charging) power supply mode, the central control system can send a corresponding reset signal to the voltage conversion device. When the latching reset unit acquires, receives, or detects the reset signal from the external central control system, it can output a target enable control signal based on the voltage comparison signal, the target current comparison signal, and the reset signal from the external central control system, re-conducting the normally-on switch (or maintaining the normally-on or off state of the normally-on switch based on the step-down discharge or step-down charging power supply mode), promptly restoring the electrical connection between the power supply and the load, avoiding power loss at the load (or power supply) due to prolonged disconnection of the power supply and load, further ensuring stable system operation, simple control, rapid response, and strong applicability.

[0079] In this application, the voltage conversion device can promptly shut off the normally-on switching transistor when a power supply system fault causes the input voltage of the transformer circuit to be greater than or equal to the output voltage and the current in the power supply system to be too large, thereby cutting off the electrical connection between the power supply and the load, improving system safety, responding quickly, having a simple structure, a convenient control method, strong applicability, extending component life, and reducing costs.

[0080] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A voltage conversion device, characterized in that, The voltage conversion device includes a control circuit and a transformer circuit. The transformer circuit includes a first switch, a second switch, a third switch, a fourth switch, and an inductor. The first and second switches are connected in series at the midpoint of a first bridge arm, and the third and fourth switches are connected in series at the midpoint of a second bridge arm. The inductor connects the midpoints of the first and second bridge arms. The two ends of the transformer circuit are connected to a power source and a load, respectively. The control circuit is connected to the control terminal of the normally-on switch of the transformer circuit. When the power source supplies power to the load through the transformer circuit, the fourth switch is the main switch, and the first switch is the normally-on switch. When the load supplies power to the power source through the transformer circuit, the second switch is the main switch, and the third switch is the normally-on switch. The control circuit is used to turn off the normally-on switch when the input voltage value of the transformer circuit is greater than or equal to the output voltage value of the transformer circuit, and the first sampling current value of the transformer circuit is greater than or equal to the first current reference value.

2. The voltage conversion device according to claim 1, characterized in that, The first sampled current value includes the input current value of the transformer circuit, the output current value of the transformer circuit, the input current value of the inductor, and / or the output current value of the inductor.

3. The voltage conversion device according to claim 1 or 2, characterized in that, The control circuit is further configured to, after turning off the normally-on switch, turn the normally-on switch back on when the input voltage value is less than the output voltage value, or when the first sampled current value is less than or equal to the first current reset value, wherein the first current reset value is less than the first current reference value.

4. The voltage conversion device according to claim 1 or 2, characterized in that, The control circuit is also used to re-turn on the normally-on switch based on a reset signal from the external central control system after the normally-on switch is turned off.

5. The voltage conversion device according to claim 4, characterized in that, The control circuit includes a comparison module and a logic control module. The input terminal of the comparison module is connected to the input terminal of the transformer circuit, the output terminal of the transformer circuit, and a first sampling point. The output terminal of the comparison module is connected to the control terminal of the normally-on switching transistor through the logic control module. The first sampling point includes the input terminal of the transformer circuit, the output terminal of the transformer circuit, the output terminal of the inductor, and / or the input terminal of the inductor. The comparison module is used to output a voltage comparison signal based on the relationship between the input voltage value and the output voltage value of the transformer circuit; The comparison module is further configured to output a first current comparison signal based on the magnitude relationship between the first sampled current value and the first current reference value, wherein the first sampled current value is the current value at the first sampling point; The logic control module is used to control the normally-on switch to turn on or off based on the voltage comparison signal and the first current comparison signal.

6. The voltage conversion device according to claim 5, characterized in that, The comparison module is also used to output a first current comparison signal based on the magnitude relationship between the first sampled current value, the first current reset value, and the first current reference value.

7. The voltage conversion device according to claim 6, characterized in that, When the transformer circuit supplies power to the load through the power supply based on the drive signal of the main switch transistor input from the external central control system, the fourth switch transistor is the main switch transistor, and the first switch transistor is the normally-on switch transistor. When the transformer circuit supplies power to the power source through the load based on the drive signal of the main switch transistor input from the external central control system, the second switch transistor is the main switch transistor, and the third switch transistor is the normally-on switch transistor.

8. The voltage conversion device according to claim 7, characterized in that, The input terminal of the comparison module is connected to the input terminal of the transformer circuit, the output terminal of the transformer circuit, the first sampling point, and the second sampling point, wherein the second sampling point includes the input terminal of the transformer circuit, the output terminal of the transformer circuit, the output terminal of the inductor, and / or the input terminal of the inductor; The comparison module is also used to output a second current comparison signal based on the relationship between the second sampled current value and the second current reference value, wherein the second sampled current value is the current value of the second sampling point.

9. The voltage conversion device according to claim 8, characterized in that, The comparison module is further configured to output a second current comparison signal based on the relationship between the second sampled current value, the second current reset value, and the second current reference value, wherein the second current reset value is less than the second current reference value.

10. The voltage conversion device according to claim 9, characterized in that, The logic control module includes a latch reset unit and a drive control unit, and the output of the comparison module is connected to the drive control unit through the latch reset unit. The latch reset unit is used to output a target enable control signal based on the voltage comparison signal and the target current comparison signal, wherein the target current comparison signal and the target enable control signal are the first current comparison signal and the first enable control signal, or the second current comparison signal and the second enable control signal; The drive control unit is used to control the target normally-on switch to be turned on or off based on the target enable control signal and the drive signal of the target normally-on switch input by the external central control system, wherein the target enable control signal and the target normally-on switch are either the first enable control signal and the first switch, or the second enable control signal and the third switch.

11. The voltage conversion device according to claim 10, characterized in that, The latch reset unit is also used to output the target enable control signal based on the voltage comparison signal, the target current comparison signal and the reset signal of the external central control system.

12. A base station power supply system, characterized in that, The base station power supply system includes a power supply, a base station, and a voltage conversion device as described in any one of claims 1 to 11, wherein the power supply is connected to the base station through the transformer circuit included in the voltage conversion device.

13. The base station power supply system according to claim 12, characterized in that, The base station power supply system includes multiple voltage conversion devices, and each of the multiple voltage conversion devices has a transformer circuit and a control circuit in each of the multiple voltage conversion devices. The power supply is connected to the base station through the multiple transformer circuits in the multiple voltage conversion devices connected in parallel.

14. A control method for a voltage conversion device, characterized in that, The method is applicable to a voltage conversion device, which includes a transformer circuit and a control circuit. The transformer circuit includes a first switch, a second switch, a third switch, a fourth switch, and an inductor. The first and second switches are connected in series at the midpoint of a first bridge arm, and the third and fourth switches are connected in series at the midpoint of a second bridge arm. The inductor connects the midpoints of the first and second bridge arms. The two ends of the transformer circuit are connected to a power supply and a load, respectively. The control circuit is connected to the control terminal of the normally-on switch in the transformer circuit. When the power supply supplies power to the load through the transformer circuit, the fourth switch is the main switch, and the first switch is the normally-on switch. When the load supplies power to the power supply through the transformer circuit, the second switch is the main switch, and the third switch is the normally-on switch. The method includes: The input voltage value of the transformer circuit, the output voltage value of the transformer circuit, and the first sampling current value are detected. When the input voltage of the transformer circuit is greater than or equal to the output voltage of the transformer circuit, and the first sampled current value is greater than or equal to the first current reference value, the normally on switch is turned off.

15. The control method according to claim 14, characterized in that, After turning off the normally on switch, the method further includes: When the input voltage value is less than the output voltage value, or the first sampling current value is less than or equal to the first current reset value, the normally on switch is turned on again, wherein the first current reset value is less than the first current reference value.

16. The control method according to claim 14 or 15, characterized in that, After turning off the normally on switch, the method further includes: The normally-on switch is reactivated based on the reset signal from the external central control system.

17. The control method according to claim 16, characterized in that, After detecting the input voltage value of the transformer circuit, the output voltage value of the transformer circuit, and the first sampled current value, the method further includes: The output voltage comparison signal is based on the relationship between the input voltage value and the output voltage value of the transformer circuit; Based on the relationship between the first sampled current value and the first current reference value, a first current comparison signal is output, wherein the first sampled current value is the current value of the first sampling point, and the first sampling point includes the input terminal of the transformer circuit, the output terminal of the transformer circuit, the output terminal of the inductor, and / or the input terminal of the inductor; The normally-on switch is controlled to turn on or off based on the voltage comparison signal and the first current comparison signal.

18. The control method according to claim 17, characterized in that, The step of outputting a first current comparison signal based on the relationship between the first sampled current value and the first current reference value includes: The first current comparison signal is output based on the relationship between the first sampled current value, the first current reset value, and the first current reference value.

19. The control method according to claim 18, characterized in that, After detecting the input voltage value of the transformer circuit, the output voltage value of the transformer circuit, and the first sampled current value, the method further includes: The second sampling current value is detected, wherein the second sampling current value includes the input current value of the transformer circuit, the output current value of the transformer circuit, the input current value of the inductor and / or the output current value of the inductor; A second current comparison signal is output based on the relationship between the second sampled current value and the second current reference value.

20. The control method according to claim 19, characterized in that, After detecting the input voltage value of the transformer circuit, the output voltage value of the transformer circuit, and the first sampled current value, the method further includes: A target enable control signal is output based on the voltage comparison signal and the target current comparison signal, wherein the target current comparison signal and the target enable control signal are the first current comparison signal and the first enable control signal, or the second current comparison signal and the second enable control signal; Based on the target enable control signal and the drive signal of the target normally-on switch input by the external central control system, the target normally-on switch is controlled to be turned on or off, wherein the target enable control signal and the target normally-on switch are the first enable control signal and the first switch, or the second enable control signal and the third switch.

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