Voltage conversion circuit, voltage conversion device and transformer

Abstract

The utility model belongs to the technical field of circuits, and provides a voltage conversion circuit, a voltage conversion device and a transformer. The voltage conversion circuit comprises a step-down conversion circuit which is connected with power supply equipment and is used for receiving a first voltage signal and carrying out filtering and step-down processing on the first voltage signal to generate a step-down driving signal; the feedback regulation circuit is connected with the step-down conversion circuit and is used for receiving the step-down driving signal and generating a feedback regulation signal according to the step-down driving signal; the step-down conversion circuit is also used for adjusting the voltage of the step-down driving signal according to the feedback adjusting signal; the isolation output circuit is connected with the step-down conversion circuit and is used for receiving the step-down driving signal, performing isolation processing on the step-down driving signal and generating a first power supply signal and a second power supply signal; therefore, the first voltage signal in a wide range can be processed, different power supply signals are generated, and power is supplied to an electric load.

Description

Technical Field

[0001] The present application belongs to the field of circuit technology, and in particular relates to a voltage conversion circuit, a voltage conversion device, and a transformer. Background Art

[0002] Voltage converters are ubiquitous in modern electronic systems, from automotive electronics and industrial control to renewable energy systems and even military and aerospace applications. This is particularly true in electric vehicles and specialized charging vehicles, where these systems often face the challenge of varying input voltages. Therefore, designing a voltage converter capable of handling a wide voltage range is crucial. Such a converter must maintain a stable output across a wide range of voltage fluctuations to ensure smooth and reliable operation in a variety of environments.

[0003] As can be seen from this, traditional voltage converter designs are usually only designed for a specific input voltage range and have relatively narrow applicability. Therefore, it is urgent to design a voltage conversion circuit with a wide voltage range. Utility Model Content

[0004] The purpose of the present application is to provide a voltage conversion circuit, a voltage conversion device and a transformer, aiming to solve the problem that the existing voltage converter is only applicable to a specific input voltage range and has a relatively narrow applicability.

[0005] A first aspect of an embodiment of the present application provides a voltage conversion circuit, wherein the voltage conversion circuit is configured to perform voltage conversion processing on a first voltage signal provided by a power supply device, the voltage conversion circuit comprising:

[0006] a step-down conversion circuit, connected to the power supply device, configured to receive the first voltage signal, filter and step down the first voltage signal, and generate a step-down drive signal;

[0007] a feedback regulation circuit, connected to the step-down conversion circuit, configured to receive the step-down driving signal and generate a feedback regulation signal according to the step-down driving signal;

[0008] The step-down conversion circuit is further configured to adjust the voltage of the step-down driving signal according to the feedback adjustment signal;

[0009] an isolation output circuit, connected to the step-down conversion circuit, configured to receive the step-down drive signal, isolate the step-down drive signal, and generate a first power supply signal and a second power supply signal;

[0010] The voltages of the first power supply signal and the second power supply signal are different.

[0011] In one embodiment, the voltage conversion circuit further includes:

[0012] a soft start circuit, connected to the step-down conversion circuit, configured to receive a first start signal and generate a soft start signal according to the first start signal;

[0013] The step-down conversion circuit is further configured to control a rate of change of the voltage of the step-down drive signal according to the soft start signal.

[0014] In one embodiment, the step-down conversion circuit includes:

[0015] a filtering unit, connected to the power supply device, configured to receive the first voltage signal and filter the first voltage signal to generate a first filtered signal;

[0016] The switch control unit is connected to the filtering unit, and is configured to receive the first filtered signal and perform voltage reduction processing on the first filtered signal to generate the voltage reduction driving signal.

[0017] In one embodiment, the feedback regulation circuit includes:

[0018] a feedback sampling unit connected to the buck conversion circuit, configured to receive the buck drive signal and generate an isolated drive signal according to the buck drive signal;

[0019] The optical coupling isolation unit is connected to the feedback sampling unit, and is used to receive the isolated driving signal, perform isolated transmission on the isolated driving signal, and generate the feedback adjustment signal.

[0020] In one embodiment, the isolated output circuit includes:

[0021] a first isolation output unit, connected to the step-down conversion circuit, configured to receive the step-down drive signal, isolate and process the step-down drive signal, and generate the first power supply signal;

[0022] The second isolation output unit is connected to the step-down conversion circuit, and is used to receive the step-down driving signal, isolate the step-down driving signal, and generate the second power supply signal.

[0023] In one embodiment, the filtering unit includes: a first fuse, a first resistor, a first capacitor, a second capacitor, and a third capacitor; wherein,

[0024] The first end of the first fuse is connected to the power supply device, the second end of the first fuse is connected to the first end of the first resistor and the first end of the first capacitor, the second end of the first resistor and the second end of the first capacitor are grounded, the second capacitor is connected in parallel with the first capacitor, and the third capacitor is connected in parallel with the second capacitor.

[0025] In one embodiment, the first isolation output unit includes: a first isolation chip, a fourth capacitor and a fifth capacitor; wherein,

[0026] The input pin of the first isolation chip is connected to the step-down conversion circuit, the output pin of the first isolation chip is connected to the first power load, the fourth capacitor is connected in series between the output pin and the ground pin of the first isolation chip, and the fifth capacitor is connected in parallel with the fourth capacitor;

[0027] The output pin of the first isolation chip is used to provide the first power supply signal.

[0028] In one embodiment, the second isolation output unit includes: a second isolation chip, a sixth capacitor, and a seventh capacitor; wherein,

[0029] The input pin of the second isolation chip is connected to the step-down conversion circuit, the output pin of the second isolation chip is connected to the second power load, the sixth capacitor is connected in series between the output pin and the ground pin of the second isolation chip, and the seventh capacitor is connected in parallel with the sixth capacitor;

[0030] The output pin of the second isolation chip is used to provide the second power supply signal.

[0031] A second aspect of an embodiment of the present application provides a voltage conversion device, which includes a voltage conversion circuit as described in any one of the above items.

[0032] A third aspect of an embodiment of the present application provides a transformer, which includes the voltage conversion device as described above.

[0033] Compared to the prior art, the embodiments of the present application offer the following advantages: The embodiments of the present application provide a voltage conversion circuit comprising a step-down conversion circuit, a feedback regulation circuit, and an isolated output circuit. By integrating the step-down conversion circuit, feedback regulation circuit, and isolated output circuit, the system can efficiently convert and process an input first voltage signal. The coordinated operation of this series of circuits enables the device to generate two power supply signals with different voltage levels—a first power supply signal and a second power supply signal—providing reliable power support for a variety of electrical loads. The step-down conversion circuit adjusts and reduces the input voltage to the required level, while the feedback regulation circuit ensures the output stability of the two power supply signals, ensuring consistent and reliable power supply even in the presence of input voltage fluctuations. Furthermore, by utilizing the isolated output circuit, the transformer can further achieve outputs at different voltage levels, which not only increases system safety but also significantly expands the application scenarios of its voltage conversion. This design is therefore applicable to a variety of complex electronic systems requiring support for multiple voltage rails, enhancing the overall device's application versatility and performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the structure of a voltage conversion circuit provided in one embodiment of the present application Figure 1 ;

[0035] Figure 2 A schematic diagram of the structure of a voltage conversion circuit provided in one embodiment of the present application Figure 2 ;

[0036] Figure 3 A schematic diagram of the structure of a voltage conversion circuit provided in one embodiment of the present application Figure 3 ;

[0037] Figure 4 A specific circuit diagram of a step-down conversion circuit provided in one embodiment of the present application;

[0038] Figure 5 A specific circuit diagram of an isolated output circuit provided in one embodiment of the present application;

[0039] Figure 6 A specific circuit diagram of a feedback regulation circuit provided in one embodiment of the present application

[0040] Figure 7 A specific circuit diagram of a soft start circuit provided in one embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0042] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0043] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0045] Wide-range input converters are power electronic conversion devices capable of operating over a wide input voltage range. Their design is crucial for adapting to varying power inputs and improving system flexibility and reliability. In modern electronic systems, wide-range input converters are widely used in automotive electronics, industrial control, renewable energy systems, and military and aerospace applications. In particular, applications such as electric vehicles and dedicated charging vehicles often face the challenge of unstable input voltages.

[0046] Traditional power converter designs are typically targeted at a specific input voltage range, while wide-range input converters are able to maintain stable output under larger voltage fluctuations, which is crucial for ensuring that equipment operates normally in different voltage environments.

[0047] In order to solve the above technical problems, refer to Figure 1As shown, an embodiment of the present application provides a voltage conversion circuit, which is used to perform voltage conversion processing on a first voltage signal provided by a power supply device 100, and then generate a corresponding power supply signal, output it to the power load, and provide electrical energy for the power load. The voltage conversion circuit includes: a step-down conversion circuit 10, a feedback regulation circuit 30 and an isolation output circuit 20.

[0048] Specifically, the buck converter circuit 10 is connected to the power supply device 100. The buck converter circuit 10 is configured to receive a first voltage signal, filter and step down the first voltage signal, and generate a buck drive signal. The feedback regulation circuit 30 is connected to the buck converter circuit 10. The feedback regulation circuit 30 is configured to receive the buck drive signal and generate a feedback regulation signal based on the buck drive signal. The buck converter circuit 10 is also configured to regulate the voltage of the buck drive signal based on the feedback regulation signal. The isolated output circuit 20 is connected to the buck converter circuit 10. The isolated output circuit 20 is configured to receive the buck drive signal and isolate the buck drive signal to generate a first power supply signal and a second power supply signal, wherein the first power supply signal and the second power supply signal have different voltages.

[0049] In this embodiment, the power supply device 100 is used to provide a first voltage signal. For example, the power supply device 100 can be a generator, a voltage-stabilizing power supply, etc. For example, the power supply device 100 can provide an input voltage of 16VDC to 560VDC. The buck converter circuit 10 is used to filter and step down the first voltage signal to generate a buck drive signal. Specifically, there may be interference signals in the first voltage signal. By filtering the first voltage signal, the stability of the circuit can be guaranteed. The buck converter circuit 10 is also used to step down the first voltage signal to generate a buck drive signal to prepare for providing electrical energy to the electrical load. In this embodiment, by setting the buck converter circuit 10, first voltage signals of different voltages can be generated into a buck drive signal of the same voltage, which can adapt to input voltages in different voltage ranges, has a wide range of applicability, and enhances the application scenario of the voltage conversion circuit.

[0050] In this embodiment, the feedback regulation circuit 30 is configured to receive a buck drive signal and generate a feedback regulation signal based on the buck drive signal. The buck converter circuit 10 is further configured to regulate the voltage of the buck drive signal based on the feedback regulation signal. Specifically, during operation, the buck converter circuit 10 may have errors, causing the voltage of the generated buck drive signal to differ from a preset value, and the voltage may fluctuate. The feedback regulation circuit 30 is configured to generate a feedback regulation signal based on the voltage of the buck drive signal and send it to the buck converter circuit 10. The buck converter circuit 10 can control its operating state based on the feedback regulation signal and adjust the voltage of the buck drive signal in real time so that the buck drive signal always meets the preset requirements. For example, when the voltage of the buck drive signal generated by the buck converter circuit 10 is too high, the voltage of the feedback regulation signal generated by the feedback regulation circuit 30 is relatively high. This controls the operating state of the buck converter circuit 10, controls the duty cycle of the switches in the buck converter circuit 10, and further reduces the voltage of the buck drive signal, thereby achieving the purpose of controlling the buck drive signal. In this embodiment, by providing a feedback regulation circuit 30, negative feedback regulation of the buck driving signal can be achieved, thereby achieving the stability of the buck driving signal, thereby improving the stability of the voltage conversion circuit and expanding the application scenarios of the voltage conversion circuit.

[0051] In this embodiment, the isolated output circuit 20 is used to receive the buck drive signal and isolate the buck drive signal to generate a first power supply signal and a second power supply signal. In this embodiment, the isolated output circuit 20 is used to isolate and transmit the buck drive signal, so as to avoid the problem of mutual interference between the buck conversion circuit 10 and the subsequent circuit, which affects the stability of the circuit. In addition, the isolated output circuit 20 is also used to generate a first power supply signal and a second power supply signal with two different voltages according to the buck drive signal, wherein the first power supply signal and the second power supply signal are used to power an external electrical load. By setting the isolated output circuit 20, the stability of the entire circuit can be improved, and by generating the first power supply signal and the second power supply signal, power can be supplied to electrical loads with different power requirements, thereby expanding the application scenarios of the voltage conversion circuit and improving core competitiveness.

[0052] In this embodiment, by integrating the step-down converter circuit 10, the feedback regulation circuit 30, and the isolated output circuit 20, the system can efficiently convert and process the input first voltage signal. The coordinated operation of this series of circuits enables the device to generate two power supply signals with different voltage levels—a first power supply signal and a second power supply signal—providing reliable power support for a variety of electrical loads.

[0053] The buck converter circuit 10 is responsible for adjusting and reducing the input voltage to the required level, while the feedback regulation circuit 30 ensures the output state of the two power supply signals is stable, thus ensuring the consistency and reliability of power supply even when the input voltage fluctuates.

[0054] Furthermore, by utilizing the isolated output circuit 20, the transformer can further achieve outputs at different voltage levels, which not only increases system safety but also significantly expands the application scenarios of its voltage conversion. This makes the design applicable to a variety of complex electronic systems requiring support for multiple voltage rails, enhancing the overall device's application diversity and performance.

[0055] In one embodiment, reference Figure 2 As shown, the voltage conversion circuit further includes a soft start circuit 40 .

[0056] Specifically, the soft start circuit 40 is connected to the buck conversion circuit 10, and the soft start circuit 40 is used to receive a first start signal and generate a soft start signal according to the first start signal; the buck conversion circuit 10 is also used to control the rate of change of the voltage of the buck drive signal according to the soft start signal.

[0057] In this embodiment, soft-start circuit 40 is connected to step-down converter circuit 10 and is a key component ensuring a smooth transition during the circuit's startup phase. Soft-start circuit 40 receives an initial startup signal (a first startup signal) and generates a gradually increasing soft-start signal to prevent instantaneous high currents from damaging circuit components. Step-down converter circuit 10 controls the rate of change of the step-down drive signal based on the soft-start signal, ensuring a gradual increase in the step-down drive signal's voltage while reducing inrush current and protecting the stability of the entire circuit.

[0058] In some embodiments, the first start signal may be provided by a reference pin VREF of the first driver chip U3 .

[0059] In some embodiments, the soft-start circuit 40 is designed to gradually increase the voltage of the buck drive signal when the circuit is powered on. An initial startup signal is sent by the main control chip. The soft-start circuit 40 receives this signal (e.g., the first startup signal) and generates a gradually increasing soft-start signal to adjust the rate of change of the buck drive signal voltage.

[0060] For example, in one embodiment, the soft start circuit 40 gradually increases the voltage of the step-down drive signal from 0V to 12V within 3 seconds. At this time, the step-down conversion circuit 10 provides a control drive signal according to the soft start signal, and the rate of change of the control drive signal is precisely controlled, thereby avoiding the stress on components or system instability that can be caused by sudden voltage changes. Through this design, the cooperation of the soft start circuit 40 and the step-down conversion circuit 10 can greatly improve the reliability and durability of the electronic system, especially in complex electrical equipment that needs to handle high energy conversion.

[0061] In one embodiment, referring to Figure 3 As shown in the figure, the step-down conversion circuit 10 includes a filter unit 11 and a switch control unit 12.

[0062] Specifically, the filter unit 11 is connected to the power supply device 100, and is configured to receive the first voltage signal and perform filtering processing on the first voltage signal to generate a first filtered signal. The switch control unit 12 is connected to the filter unit 11, and is configured to receive the first filtered signal and perform step-down processing on the first filtered signal to generate a step-down drive signal.

[0063] In this embodiment, the step-down conversion circuit 10 is composed of the filter unit 11 and the switch control unit 12, and undertakes the key task of converting irregular input voltage into stable output voltage (e.g., the step-down drive signal).

[0064] Specifically, the filter unit 11 is connected to the power supply device 100, and is configured to receive the first voltage signal and perform filtering processing on the first voltage signal to generate a first filtered signal. The switch control unit 12 is connected to the filter unit 11, and is configured to receive the first filtered signal and perform step-down processing on the first filtered signal to generate a step-down drive signal.

[0065] Subsequently, the switch control unit 12 is closely associated with the filter unit 11 and performs step-down processing after obtaining the first filtered signal. This unit precisely adjusts the output voltage by controlling the on-off frequency and duty cycle of the switch tube, and generates a stable and reliable step-down drive signal. This control mechanism not only maintains the stability of the output voltage, but also dynamically adjusts according to the load demand, ensuring the optimization of the performance of the entire system.

[0066] In this embodiment, the voltage conversion circuit is used to convert unstable grid input voltage into stable voltage output required by the device. Assuming that the input voltage fluctuates between 16V and 560V, the filter unit 11 will first process it to remove high-frequency noise and output a relatively smooth voltage signal.

[0067] The switching control unit 12 then uses this generated filtered signal to drive the step-down process. This unit carefully designs its switching frequency and duty cycle to ensure a stable 12V DC output. This process effectively prevents equipment damage or performance instability caused by voltage fluctuations and ensures that the entire system operates with high efficiency and safety. This design demonstrates the reliability and adaptability of the step-down converter circuit 10 in various industrial environments, ensuring not only the normal operation of the equipment but also significantly improving the system's energy efficiency.

[0068] In one embodiment, reference Figure 3 As shown, the feedback regulation circuit 30 includes: a feedback sampling unit 31 and an optical coupling isolation unit 32 .

[0069] Specifically, the feedback sampling unit 31 is connected to the output end of the buck conversion circuit 10, and the feedback sampling unit 31 is used to receive the buck drive signal and generate an isolated drive signal based on the buck drive signal; the optocoupler isolation unit 32 is connected to the feedback sampling unit 31, and the optocoupler isolation unit 32 is used to receive the isolated drive signal and isolate and transmit the isolated drive signal to generate a feedback adjustment signal.

[0070] In this embodiment, the feedback regulation circuit 30 consists of a feedback sampling unit 31 and an optocoupler isolation unit 32, which are used to enhance the stability and safety of the circuit. Specifically, the feedback sampling unit 31 is directly connected to the output of the buck converter circuit 10. Its function is to receive the output buck drive signal and generate an isolated drive signal based on this signal. This process ensures accurate sampling of output voltage fluctuation information, providing an accurate reference for subsequent regulation.

[0071] Next, the optocoupler isolation unit 32 is connected to the feedback sampling unit 31 to receive the isolated drive signal and transmit it safely and in isolation, ultimately generating a feedback regulation signal. This isolation ensures electrical isolation of the signal transmission, preventing high voltage from directly feeding back into the control loop, thereby improving the overall stability and safety of the circuit.

[0072] In one embodiment, a feedback regulation circuit 30 is used to ensure precise control of the output voltage. Specifically, the buck converter circuit 10 outputs a fixed 12V voltage, which is monitored by a feedback sampling unit 31. The feedback sampling unit 31 samples the 12V output and generates an isolated drive signal suitable for transmission. This signal is sent to the optocoupler isolation unit 32. The optocoupler, through its internal photoelectric conversion device, successfully converts the electrical signal into an optical signal for isolated transmission. The optical signal is then converted back into an electrical signal and fed into the control circuit, generating an accurate feedback regulation signal for real-time circuit regulation.

[0073] The whole process protects the low-voltage control unit in the system from the high-voltage part, while ensuring stable regulation of the converter output voltage. This feedback regulation circuit 30 is particularly important in industrial and high-precision electronic equipment, which can ensure the efficient and safe operation of the equipment.

[0074] In one embodiment, referring to Figure 3 As shown, the isolation output circuit 20 includes a first isolation output unit 21 and a second isolation output unit 22.

[0075] Specifically, the first isolation output unit 21 is connected to the step-down conversion circuit 10, and is used to receive the step-down drive signal and perform isolation processing on the step-down drive signal to generate a first power supply signal; the second isolation output unit 22 is connected to the step-down conversion circuit 10, and is used to receive the step-down drive signal and perform isolation processing on the step-down drive signal to generate a second power supply signal; wherein the voltages of the first power supply signal and the second power supply signal are different.

[0076] In this embodiment, the isolation output circuit 20 is composed of the first isolation output unit 21 and the second isolation output unit 22, which can provide multiple voltage rail isolation power supply for the system. Specifically, the first isolation output unit 21 is connected to the step-down conversion circuit 10, and is used to receive the step-down drive signal and perform isolation processing on the step-down drive signal to generate a first power supply signal. This signal not only maintains electrical isolation, but also provides a safe and reliable power source. At the same time, the second isolation output unit 22 is also connected to the same step-down conversion circuit 10, receives the step-down drive signal, and performs isolation processing to generate a second power supply signal. The two isolation output units are configured differently to ensure that the voltages of the first and second power supply signals are different to meet the needs of different loads.

[0077] In one embodiment, it is often necessary to provide different operating voltages for multiple devices. For example, the system requires 12V and 24V DC voltage at the same time. After the step-down conversion circuit 10, this voltage is uniformly converted into a 12V step-down drive signal.

[0078] The first isolation output unit 21 processes this 12V signal and outputs 12V power after isolation, which can be used for microprocessor units and other low-power components. At the same time, the second isolation output unit 22 processes the same 12V signal with different parameters and outputs 24V power after isolation, which is suitable for powering devices such as sensors that require other voltages.

[0079] This design is commonly used in complex electronic systems to ensure that different subsystems can operate under optimal voltage conditions, thereby improving overall efficiency and stability.

[0080] In one embodiment, referring to Figure 4As shown, the filter unit 11 includes a first fuse F1, a first resistor R1, a first capacitor C1, a second capacitor C2, and a third capacitor C3.

[0081] Specifically, a first end of the first fuse F1 is connected with the power supply device 100, a second end of the first fuse F1 is connected with a first end of the first resistor R1 and a first end of the first capacitor C1, a second end of the first resistor R1 is grounded with a second end of the first capacitor C1, the second capacitor C2 is connected with the first capacitor C1 in parallel, and the third capacitor C3 is connected with the second capacitor C2 in parallel. In this embodiment, the first fuse F1 is used for overcurrent protection to prevent large current of the power supply device 100, the first resistor R1 can be a thermistor, the first capacitor C1, the second capacitor C2, and the third capacitor C3 are filter capacitors, and the first capacitor C1, the second capacitor C2, and the third capacitor C3 are used for filtering to eliminate spike noise and fluctuations in the input signal, thereby generating a smooth first filtered signal to ensure stability of the circuit.

[0082] In one embodiment, referring to Figure 5 As shown, the first isolation output unit 21 includes a first isolation chip U1, a fourth capacitor C4, and a fifth capacitor C5.

[0083] Specifically, an input pin VIN of the first isolation chip U1 is connected with an output end of the step-down conversion circuit 10, an output pin +Vo of the first isolation chip U1 is connected with the first power load, the fourth capacitor C4 is connected in series between the output pin +Vo and a ground pin OV of the first isolation chip U1, and the fifth capacitor C5 is connected with the fourth capacitor C4 in parallel; and the output end +Vo of the first isolation chip U1 is used for providing a first power supply signal. In this embodiment, the first isolation chip U1 is used for isolating the step-down driving signal to generate the first power supply signal, and the fourth capacitor C4 and the fifth capacitor C5 are used for filtering the first power supply signal to maintain stability of the circuit.

[0084] In one embodiment, referring to Figure 5 As shown, the second isolation output unit 22 includes a second isolation chip U2, a sixth capacitor C6, and a seventh capacitor C7.

[0085] Specifically, the input pin VIN of the second isolation chip U2 is connected with the output end of the step-down conversion circuit 10, the output pin +Vo of the second isolation chip U2 is connected with the second power load, the sixth capacitor C6 is connected in series between the output pin +Vo of the second isolation chip U2 and the ground pin 0V, and the seventh capacitor C7 is connected in parallel with the sixth capacitor C6; the output pin +Vo of the second isolation chip U2 is used to provide the second power supply signal. In the embodiment, the second isolation chip U2 is used to isolate and process the step-down driving signal to generate the first power supply signal, and the sixth capacitor C6 and the seventh capacitor C7 are used to filter the first power supply signal to maintain the stability of the circuit.

[0086] In one embodiment, the CTRL pin and the TRIM pin of the first isolation chip U1 and the second isolation chip U2 are left dangling.

[0087] In one embodiment, continuing to refer to Figure 4 As shown in the figure, the switch control unit 12 includes: a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first inductor L1, a second inductor L2, a first switch Q1, and a first drive chip U3.

[0088] Specifically, the first end of the second resistor R2 and the first end of the third resistor R3 are connected with the filter unit 11, the second end of the second resistor R2, the second end of the third resistor R3, the first end of the fourth resistor R4, and the first end of the fifth resistor R5 are connected together (the four ends are connected together), the second end of the fourth resistor R4 and the second end of the fifth resistor R5 are connected together at the first end of the fourth diode D4, the second end of the fourth diode D4 is connected with the power supply pin VCC of the first drive chip U3, the power supply pin VCC of the first drive chip U3 is connected with the ground through the twelfth capacitor C12 in series, and the power supply pin VCC of the first drive chip U3 can be connected with an external power supply.

[0089] The current detection pin ISENSE of the first drive chip U3 is connected with the first end of the tenth resistor R10 through the port CS in series with the sixth resistor R6, and the current detection pin ISENSE of the first drive chip U3 is connected with the ground in series with the sixth resistor R6 and the tenth capacitor C10.

[0090] The oscillation pin RT / CT of the first driver chip U3 is connected in series with the eleventh capacitor C11 and then to ground. The oscillation pin RT / CT of the first driver chip U3 is connected in series with the seventh resistor R7 and then to the reference pin VREF of the first driver chip U3. The reference pin VREF of the first driver chip U3 is also connected in series with the ninth capacitor C9 and then to ground.

[0091] The output pin OUT of the first driver chip U3 is connected in series with a third diode D3 and then to ground. The output pin OUT of the first driver chip U3 is further connected in series with an eighth resistor R8 and then to the control end of the first switch tube Q1. The control end of the first switch tube Q1 is further connected in series with a ninth resistor R9 and then to ground. The second end of the tenth resistor R10 is grounded. The eleventh resistor R11 is connected in parallel with the tenth resistor R10. The first end of the first switch tube Q1 is connected to the first end of the tenth resistor R10. The second end of the first switch tube Q1 is connected to the first end of the first diode D1. The second end of the first diode is connected to the filtering unit 11. The second diode D2 is connected in parallel with the first diode. The second end of the first switch tube Q1 is further connected in series with the first inductor L1 and the second inductor L2 and then to the first end of the eighth capacitor C8. The first end of the eighth capacitor C8 is also connected to the ground terminal V0- of the isolation output circuit 20. The second end of the eighth capacitor C8 is connected to the filtering unit 11.

[0092] In one embodiment, the first driver chip U3 can be UC2842, an integrated circuit chip with multiple features, including automatic feedforward compensation, pulse-by-pulse current limiting, enhanced load response characteristics, undervoltage lockout with hysteresis, double pulse suppression, high current totem pole output, internally adjusted bandgap reference, and an operating frequency of up to 500kHz. The maximum duty cycle of UC2842 can reach 100%. The first driver chip U3's 7-pin power supply pin VCC is used to power the chip, and the output pin OUT is used to output PWM to drive the MOSFET on or off (for example, the first switch Q1). Pin 1 COMP is the chip's error amplifier output pin, pin 2 FB is the chip's op amp's reverse input pin, and pin 3 is the current sense pin, which serves as overcurrent protection. When the output current exceeds the set threshold, the CS pin voltage is greater than 1V, and the chip's 6-pin OUT output is low. The chip's 8-pin VREF is the voltage reference. After the chip is powered normally, the chip's 8-pin VREF voltage outputs 5V. The 4-pin external R and C oscillate to generate a certain frequency signal. By selecting the RC parameters, the chip's operating frequency is set.

[0093] In one embodiment, reference Figure 6As shown, the feedback sampling unit 31 includes: a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a thirteenth capacitor C13, a fourteenth capacitor C14 and a voltage regulator TL431.

[0094] Specifically, a first end of the twelfth resistor R12 is connected to the switch control unit 12, a second end of the twelfth resistor R12 is connected in series with the thirteenth resistor R13 and then connected to the ground terminal V0- of the isolation output circuit 20, a fourteenth resistor R14 is connected in parallel with the twelfth resistor R12, a fifteenth resistor R15 is connected in parallel with the thirteenth resistor R13, a first end of the seventeenth resistor R17 is connected to the second end of the twelfth resistor R12, a second end of the seventeenth resistor R17 is connected to the first end of the tenth capacitor C10, the first end of the fourteenth capacitor C14, and the second end of the voltage regulator TL431. The two ends are connected in common, the second end of the fourteenth capacitor C14 and the third end of the voltage regulator TL431 are commonly connected to the ground terminal V0- of the isolated output circuit 20, the second end of the thirteenth capacitor C13 is connected to the first end of the voltage regulator TL431, the first end of the sixteenth resistor R16 is connected to the first end of the twelfth resistor R12, the second end of the sixteenth resistor R16 is connected to the first end of the optocoupler isolation chip U4, the second end of the optocoupler isolation chip U4 is connected to the second end of the thirteenth capacitor C13, and the eighteenth resistor R18 is connected in series between the first end and the second end of the optocoupler isolation chip U4.

[0095] In one embodiment, continue to refer to Figure 6 As shown, the optocoupler isolation unit 32 includes: an optocoupler isolation chip U4, a nineteenth resistor R19 and a twentieth resistor R20.

[0096] Specifically, the first end of the nineteenth resistor R19 and the first end of the twentieth resistor R20 are commonly connected to the third end of the optocoupler isolation chip U4, the second end of the nineteenth resistor R19 is grounded, the second end of the twentieth resistor R20 is connected to the feedback pin VFB of the first driver chip U3, and the fourth end of the optocoupler isolation chip U4 is connected to the reference pin VREF of the first driver chip U3.

[0097] In one embodiment, since the front-stage buck converter circuit 10 and the isolated output circuit 20 do not share a common ground, isolated feedback control is required to stabilize the output voltage of the front-stage. This solution uses an optocoupler isolated feedback control circuit, which is mature and reliable. For example, when there is voltage at the front-stage output terminals V0+ and V0-, the optocoupler isolation chip U4 is turned on and feedback is fed back to the feedback pin VFB of the first driver chip U3 to control the duty cycle of the first switch tube Q1. The larger the voltage of V0+ and V0-, the larger VFB (the smaller COMP), and the first driver chip U3 controls the duty cycle of the first switch tube Q1 to reduce the voltage at V0+ and V0-, thereby achieving the voltage at V0+ and V0- being stable at 12V.

[0098] In one embodiment, reference Figure 7 As shown, the soft start circuit 40 includes: a twenty-first resistor R21, a twenty-second resistor R22, a fifteenth capacitor C15, a sixteenth capacitor C16 and a second switch tube Q2.

[0099] Specifically, the first end of the twenty-first resistor R21 is connected to the reference pin VREF of the first driver chip U3, the second end of the twenty-first resistor R21 is commonly connected to the control end of the second switch tube Q2 and the first end of the fifteenth capacitor C15, the first end of the second switch tube Q2 and the second end of the fifteenth capacitor C15 are grounded, the second end of the second switch tube Q2, the first end of the sixteenth capacitor C16, and the first end of the twenty-second resistor R22 are commonly connected to the error amplifier output pin COMP of the first driver chip U3, and the second end of the sixteenth capacitor C16 and the second end of the twenty-second resistor R22 are commonly connected to the feedback pin VFB of the first driver chip U3.

[0100] In this embodiment, the soft-start circuit 40 can slowly increase the output voltage from zero, reducing the inrush current of the power supply during startup. For example, when the circuit is initially powered on, the VREF terminal gradually charges the fifteenth capacitor C15, causing the fifteenth capacitor C15 to slowly charge. The second switch Q2 is a PNP transistor, and its base voltage gradually increases. The second switch Q2 is gradually cut off, and the COMP terminal voltage gradually increases from zero. The VFB terminal voltage gradually increases from zero to the VREF pin voltage. The COMP pin voltage gradually increases from low to high, and the output duty cycle gradually increases, so the output voltage also increases from small to large.

[0101] In one embodiment, continue to refer to Figure 5As shown, the isolated output circuit 20 further includes a seventeenth capacitor C17, an eighteenth capacitor C18, and a nineteenth capacitor C19. Specifically, the seventeenth capacitor C17, the eighteenth capacitor C18, and the nineteenth capacitor C19 are all connected in parallel with the eighth capacitor C8. In this embodiment, the seventeenth capacitor C17, the eighteenth capacitor C18, and the nineteenth capacitor C19 can filter the step-down drive signal.

[0102] An embodiment of the present application further provides a voltage conversion device, which includes any voltage conversion circuit as described above.

[0103] Specifically, the voltage conversion device integrates the voltage conversion circuit described above. Its core design is to use advanced circuit architecture to achieve stable voltage conversion and adapt to the needs of various devices and application scenarios.

[0104] This voltage conversion device successfully converts unstable input voltage into stable outputs at multiple voltage levels through the coordinated operation of multiple components, including a filter unit 11, a switch control unit 12, and an isolated output unit. The filter unit 11 ensures initial signal purification, while the switch control unit 12 provides precise voltage regulation. The isolated output unit ultimately provides multi-rail voltage outputs to meet the diverse needs of various loads.

[0105] This device is particularly suitable for industrial automation equipment, renewable energy systems, and various electronic applications requiring efficient voltage management. Its flexible voltage output capability and high-efficiency energy conversion performance significantly improve system reliability and efficiency.

[0106] An embodiment of the present application further provides a transformer, which includes the voltage conversion device as described above.

[0107] Specifically, the transformer integrates the aforementioned voltage conversion device. By integrating advanced design concepts of voltage conversion circuits, the transformer can efficiently perform voltage regulation and electrical isolation, adapting to a variety of complex application scenarios.

[0108] This transformer not only provides the basic voltage conversion functions of a traditional transformer, but also significantly enhances the stability and diversity of voltage output due to its built-in voltage conversion device. The filtering, control, and isolation technologies within the voltage conversion device ensure precise management of output voltage, enabling flexible output voltage levels to meet the needs of different equipment and systems.

[0109] This transformer is particularly suitable for industrial automation, renewable energy distribution systems, and electronic equipment requiring strict voltage control. By improving voltage conversion efficiency and system reliability, it provides an innovative solution for modern power management.

[0110] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0111] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0112] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0113] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A voltage conversion circuit, characterized in that: The voltage conversion circuit is used to perform voltage conversion processing on the first voltage signal provided by the power supply device, and the voltage conversion circuit includes: a step-down conversion circuit, connected to the power supply device, configured to receive the first voltage signal, filter and step down the first voltage signal, and generate a step-down drive signal; a feedback regulation circuit, connected to the step-down conversion circuit, configured to receive the step-down driving signal and generate a feedback regulation signal according to the step-down driving signal; The step-down conversion circuit is further configured to adjust the voltage of the step-down driving signal according to the feedback adjustment signal; an isolation output circuit, connected to the step-down conversion circuit, configured to receive the step-down drive signal, isolate the step-down drive signal, and generate a first power supply signal and a second power supply signal; The voltages of the first power supply signal and the second power supply signal are different.

2. The voltage conversion circuit according to claim 1, wherein: The voltage conversion circuit further includes: a soft start circuit, connected to the step-down conversion circuit, configured to receive a first start signal and generate a soft start signal according to the first start signal; The step-down conversion circuit is further configured to control a rate of change of a voltage of the step-down drive signal according to the soft start signal.

3. The voltage conversion circuit according to claim 1, wherein: The step-down conversion circuit comprises: a filtering unit, connected to the power supply device, configured to receive the first voltage signal and filter the first voltage signal to generate a first filtered signal; The switch control unit is connected to the filtering unit, and is configured to receive the first filtered signal and perform voltage reduction processing on the first filtered signal to generate the voltage reduction driving signal.

4. The voltage conversion circuit according to claim 1, wherein: The feedback regulation circuit includes: a feedback sampling unit connected to the buck conversion circuit, configured to receive the buck drive signal and generate an isolated drive signal according to the buck drive signal; The optical coupling isolation unit is connected to the feedback sampling unit, and is used to receive the isolated driving signal, perform isolated transmission on the isolated driving signal, and generate the feedback adjustment signal.

5. The voltage conversion circuit according to claim 1, wherein: The isolated output circuit includes: a first isolation output unit, connected to the step-down conversion circuit, configured to receive the step-down drive signal, isolate and process the step-down drive signal, and generate the first power supply signal; The second isolation output unit is connected to the step-down conversion circuit, and is used to receive the step-down driving signal, isolate the step-down driving signal, and generate the second power supply signal.

6. The voltage conversion circuit according to claim 3, wherein: The filtering unit includes: a first fuse, a first resistor, a first capacitor, a second capacitor and a third capacitor; wherein, The first end of the first fuse is connected to the power supply device, the second end of the first fuse is connected to the first end of the first resistor and the first end of the first capacitor, the second end of the first resistor and the second end of the first capacitor are grounded, the second capacitor is connected in parallel with the first capacitor, and the third capacitor is connected in parallel with the second capacitor.

7. The voltage conversion circuit according to claim 5, wherein: The first isolation output unit includes: a first isolation chip, a fourth capacitor and a fifth capacitor; wherein, The input pin of the first isolation chip is connected to the step-down conversion circuit, the output pin of the first isolation chip is connected to the first power load, the fourth capacitor is connected in series between the output pin and the ground pin of the first isolation chip, and the fifth capacitor is connected in parallel with the fourth capacitor; The output pin of the first isolation chip is used to provide the first power supply signal.

8. The voltage conversion circuit according to claim 5, wherein: The second isolation output unit includes: a second isolation chip, a sixth capacitor and a seventh capacitor; wherein, The input pin of the second isolation chip is connected to the step-down conversion circuit, the output pin of the second isolation chip is connected to the second power load, the sixth capacitor is connected in series between the output pin and the ground pin of the second isolation chip, and the seventh capacitor is connected in parallel with the sixth capacitor; The output pin of the second isolation chip is used to provide the second power supply signal.

9. A voltage conversion device, characterized in that: The voltage conversion device includes the voltage conversion circuit according to any one of claims 1 to 8.

10. A transformer, characterized in that: The transformer includes the voltage conversion device according to claim 9.

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