A power supply output circuit and a power supply system

Abstract

The application relates to a power supply output circuit and a power supply system, the power supply output circuit comprising a first-phase output circuit, a second-phase output circuit, a third-phase output circuit, a first interlocking bus, a second interlocking bus and a third interlocking bus, wherein a target-phase output circuit transmits a target-phase power supply and generates an interlocking signal in response to the input of the target-phase power supply, the interlocking signal is transmitted to other-phase output circuits through the interlocking bus electrically connected with the target-phase output circuit, so that the other-phase output circuits enter a stop working state in response to the interlocking signal. Moreover, the time for each phase output circuit to generate the interlocking signal is different, so that only one interlocking signal is generated each time, and only one phase output circuit transmits the target-phase power supply. Therefore, when the phase is lost or an abnormality occurs in a certain phase, the target-phase output circuit can inhibit the other phase output circuits from outputting corresponding phase power supplies, and stably transmit the target-phase power supply, so that the stability of single-phase power output is improved.

Description

Technical Field

[0001] This application relates to the field of single-phase power output, and in particular to a power output circuit and power supply system. Background Technology

[0002] In modern power systems, three-phase power is widely used in industrial and commercial environments to transmit high-power electrical energy. However, many devices and applications require single-phase power; therefore, extracting stable single-phase power from three-phase power has become a key technology.

[0003] Traditional circuits for extracting single-phase power from three-phase power typically use a direct connection method to obtain single-phase voltage. However, when phase imbalance occurs in the power system, especially in the case of phase loss (i.e., "phase loss"), traditional circuit designs often cannot provide a stable single-phase voltage, resulting in unstable output voltage or equipment malfunction. In severe cases, it may even damage sensitive electrical equipment and reduce system reliability. Summary of the Invention

[0004] The embodiments of this application aim to provide a power output circuit and power supply system that can improve the stability of single-phase power output.

[0005] To address the aforementioned technical problems, this application provides the following technical solutions:

[0006] In a first aspect, embodiments of this application provide a power output circuit, including a first-phase output circuit, a second-phase output circuit, a third-phase output circuit, a first interlock bus, a second interlock bus, and a third interlock bus. The output terminal of the first-phase output circuit is electrically connected to the control terminal of the second-phase output circuit via the first interlock bus, and is also electrically connected to the control terminal of the third-phase output circuit via the second interlock bus. The output terminal of the second-phase output circuit is electrically connected to the control terminal of the third-phase output circuit via the third interlock bus.

[0007] The target phase output circuit responds to the input of the target phase power supply, transmits the target phase power supply and generates an interlock signal. The interlock signal is transmitted to other phase output circuits through an interlock bus electrically connected to the target phase output circuit, so that the other phase output circuits respond to the interlock signal and enter a stop working state.

[0008] The target phase output circuit is the phase output circuit that generates the interlock signal fastest among the phase output circuits corresponding to the phase power supply without abnormalities, and the time for the first phase output circuit to generate the interlock signal is less than the time for the second phase output circuit to generate the interlock signal, and the time for the second phase output circuit to generate the interlock signal is less than the time for the third phase output circuit to generate the interlock signal.

[0009] In some embodiments, the target phase output circuit includes a rectification unit, a delay unit, a trigger unit, and a switching unit;

[0010] The first end of the rectifier unit is electrically connected to the first end of the delay unit, the second end of the rectifier unit is electrically connected to the second end of the delay unit and the trigger unit, and the output end of the trigger unit is also electrically connected to the control end of the switch unit and the corresponding interlock bus.

[0011] The rectifier unit performs step-down rectification on the target phase power supply to output a target DC voltage. The trigger unit responds to the input of the target DC voltage, generates and outputs the interlock signal, and the switch unit responds to the input of the interlock signal to enter the conduction state to transmit the target phase power supply.

[0012] The delay unit is used to control the time when the rectifier unit outputs the target DC voltage, so as to control the generation time of the interlock signal. The time when the rectifier unit of the first phase outputs the DC voltage is less than the time when the rectifier unit of the second phase outputs the DC voltage, and the time when the rectifier unit of the second phase outputs the DC voltage is less than the time when the rectifier unit of the third phase outputs the DC voltage.

[0013] In some embodiments, the rectifier unit includes a transformer, a rectifier bridge, and a capacitor;

[0014] The primary winding of the transformer is used to connect to the target phase power supply, the secondary winding of the transformer is electrically connected to the input terminal of the rectifier bridge, and the output terminal of the rectifier bridge is electrically connected to the capacitor.

[0015] The transformer is used to step down the target phase power supply and output the target AC voltage. The rectifier bridge is used to rectify the target AC voltage and output the rectified DC voltage to charge the capacitor, so that the capacitor outputs the target DC voltage.

[0016] In some embodiments, the delay unit includes a current-limiting resistor, wherein the current-limiting resistor is connected in series between the output terminal of the rectifier bridge and the capacitor, and the resistance value of the current-limiting resistor of the first phase is less than the resistance value of the current-limiting resistor of the second phase, and the resistance value of the current-limiting resistor of the second phase is less than the resistance value of the current-limiting resistor of the third phase.

[0017] In some embodiments, the triggering unit includes a voltage divider unit and a signal generation unit;

[0018] The voltage divider unit is electrically connected to the second terminal of the rectifier unit and the control terminal of the signal generation unit, respectively. The output terminal of the signal generation unit is also electrically connected to the control terminal of the switch unit and the corresponding interlock bus.

[0019] The voltage divider unit generates a voltage divider signal in response to the input of the target DC voltage, and the signal generation unit generates and outputs the interlock signal in response to the input of the voltage divider signal.

[0020] In some embodiments, the voltage divider unit includes a first voltage divider resistor and a second voltage divider resistor, and the signal generation unit includes a three-terminal adjustable voltage regulator;

[0021] The first voltage divider resistor and the second voltage divider resistor are connected in series between the second terminal of the rectifier unit and ground. The common connection terminal of the first voltage divider resistor and the second voltage divider resistor is electrically connected to the control terminal of the three-terminal adjustable voltage regulator. The anode of the three-terminal adjustable voltage regulator is grounded, and the cathode of the three-terminal adjustable voltage regulator is electrically connected to the control terminal of the switching unit and the corresponding interlock bus, respectively.

[0022] In some embodiments, the switching unit includes an optocoupler and a three-terminal bidirectional thyristor;

[0023] The anode of the diode in the optocoupler is used to connect to the target DC voltage, the cathode of the diode in the optocoupler is used to connect to the interlock signal, the output terminal of the optocoupler is electrically connected to the gate of the triac, the first anode of the triac is used to connect to the target phase power supply, and the second anode of the triac is used to output the target phase power supply.

[0024] In some embodiments, the target phase output circuit further includes an indicator unit electrically connected to a second terminal of the rectifier unit, the indicator unit emitting light in response to the input of the target DC voltage.

[0025] In some embodiments, the indicating unit includes a light-emitting diode (LED), the anode of which is electrically connected to the second terminal of the rectifier unit, and the cathode of which is connected to the power supply terminal of the switching unit.

[0026] In a second aspect, embodiments of this application provide a power supply system, including a three-phase power supply, a load, and a power output circuit as described above;

[0027] The first phase output circuit is connected between the first phase AC power and the load, the second phase output circuit is connected between the second phase AC power and the load, and the third phase output circuit is connected between the three-phase power supply and the load.

[0028] The power output circuit is used to transmit the target phase power to supply power to the load.

[0029] In various embodiments of this application, the power output circuit includes a first-phase output circuit, a second-phase output circuit, a third-phase output circuit, a first interlock bus, a second interlock bus, and a third interlock bus. The phase output circuit that generates the fastest interlock signal among the phase output circuits without abnormalities is identified as the target phase output circuit. The target phase output circuit responds to the input of the target phase power supply, transmits the target phase power supply, and generates an interlock signal. This interlock signal is transmitted to other phase output circuits via the interlock bus electrically connected to the target phase output circuit, causing the other phase output circuits to enter a stop-operation state in response to the interlock signal. Furthermore, the time for the first phase output circuit to generate the interlock signal is shorter than the time for the second phase output circuit to generate the interlock signal, and the time for the second phase output circuit to generate the interlock signal is shorter than the time for the third phase output circuit to generate the interlock signal. The different times for each phase output circuit to generate the interlock signal ensure that only one interlock signal is generated at a time, thereby ensuring that only one phase output circuit transmits the target phase power supply. Therefore, in the event of phase loss or an abnormality in a certain phase, the target phase output circuit can suppress the output of the corresponding phase power supply from other phase output circuits and stably transmit the target phase power supply, improving the stability of single-phase power output. Attached Figure Description

[0030] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0031] Figure 1 This is a schematic diagram of a power supply system provided in an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of a power output circuit provided in an embodiment of this application;

[0033] Figure 3 This is a schematic diagram of the structure of a target phase output circuit provided in an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of the circuit structure of a target phase circuit provided in an embodiment of this application;

[0035] Figure 5 This is a schematic diagram of the circuit structure of a first-phase output circuit provided in an embodiment of this application;

[0036] Figure 6 This is a schematic diagram of the circuit structure of a power output circuit provided in an embodiment of this application. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0038] Please see Figure 1 , Figure 1 This is a schematic diagram of a power supply system provided in an embodiment of this application, such as... Figure 1 As shown, the power supply system includes a three-phase power supply 200, a load 300, and a power output circuit 100. The power output circuit 100 includes a first-phase output circuit 10, a second-phase output circuit 20, and a third-phase output circuit 30.

[0039] The three-phase power supply 200 consists of a first phase power supply 201, a second phase power supply 202, and a third phase power supply 203. The three-phase power supply 200 is widely used in industrial and commercial environments, such as motor drives, power transmission, control systems, and power plants. The three-phase power supply 200 can provide high-power electrical energy and provide a reliable power supply for the load 300.

[0040] However, many devices and applications require single-phase power. For example, in homes, offices, and small commercial spaces where low power is required, only single-phase AC power is needed to power load 300. Therefore, the corresponding single-phase AC power can be extracted through the phase output circuit to power load 300.

[0041] Specifically, the first-phase output circuit 10 is connected between the first-phase power supply 201 and the load 300, the second-phase output circuit 20 is electrically connected between the second-phase power supply 202 and the load 300, and the third-phase output circuit 30 is connected between the third-phase power supply 203 and the load 300. When single-phase power supply is required, the single-phase AC power is transmitted to the corresponding phase power supply through the corresponding phase output circuit. For example, if the first-phase power supply 201 supplies power to the load 300, then the first-phase power supply 201 is transmitted through the first-phase output circuit 10 to supply power to the load 300. If the second-phase power supply 202 supplies power to the load 300, then the second-phase power supply 202 is transmitted through the second-phase output circuit 20 to supply power to the load 300. If the third-phase power supply 203 supplies power to the load 300, then the third-phase power supply 203 is transmitted through the third-phase output circuit 30 to supply power to the load 300.

[0042] Traditional circuits for extracting single-phase power typically use a direct connection method to obtain single-phase power. However, when phase imbalance occurs in the power system, especially in the case of phase loss (i.e., "phase loss"), traditional circuit designs often cannot provide a stable single-phase power supply, resulting in unstable output voltage or equipment malfunction. In severe cases, it may even damage sensitive electrical equipment and reduce system reliability.

[0043] For the reasons mentioned above, this application provides a power output circuit 100 that can stably and reliably output single-phase power in the event of phase imbalance or phase loss.

[0044] Specifically, such as Figure 2 As shown, the power output circuit 100 includes a first-phase output circuit 10, a second-phase output circuit 20, and a third-phase output circuit 30, as well as a first interlock bus, a second interlock bus, and a third interlock bus. The first output terminal of the first-phase output circuit 10 is electrically connected to the control terminal of the second-phase output circuit 20 via the first interlock bus, and is also electrically connected to the control terminal of the third-phase output circuit 30 via the second interlock bus. The first output terminal of the second-phase output circuit 20 is electrically connected to the control terminal of the third-phase output circuit 30 via the third interlock bus.

[0045] Each phase output circuit can generate an interlock signal, which can be transmitted to the corresponding interlock bus and then to other phase output circuits connected to that interlock bus, controlling the other phase output circuits to enter a stop-operation state. Furthermore, the timing of the interlock signal generation by each phase output circuit differs, with the first phase output circuit 10 generating its interlock signal less than the second phase output circuit 20, and the second phase output circuit 20 generating its interlock signal less than the third phase output circuit 30. Therefore, if the phase output circuit that generates its interlock signal faster has already done so, that interlock signal will, based on the corresponding interlock bus, control the other phase output circuits to enter a stop-operation state, and the other phase output circuits will no longer generate their corresponding interlock signals. This ensures that only one interlock signal is generated at a time, thereby guaranteeing that only one phase output circuit transmits the target phase power.

[0046] For example, if the first phase power supply 201 is normal, the first phase output circuit 10 will generate an interlock signal first. This interlock signal is transmitted to the control terminal of the second phase output circuit 20 based on the first interlock bus, controlling the second phase output circuit 20 to enter a stop working state. This interlock signal is also transmitted to the control terminal of the third phase output circuit 30 based on the second interlock bus, controlling the third phase output circuit 30 to enter a stop working state. Neither the second phase output circuit 20 nor the third phase output circuit 30 will generate an interlock signal.

[0047] If the first phase power supply 201 is abnormal and the second phase power supply 202 is normal, the first phase output circuit 10 will no longer generate an interlock signal, and the second phase output circuit 20 will generate an interlock signal first. This interlock signal is transmitted to the control terminal of the third phase output circuit 30 based on the third interlock bus, controlling the third phase output circuit 30 to enter a stop working state.

[0048] If the first phase power supply 201 or the second phase power supply 202 malfunctions, the first phase output circuit 10 and the second phase output circuit 20 will no longer generate interlock signals. The third phase output circuit 30 will generate an interlock signal, but since the first output terminal of the third phase output circuit 30 is not connected to either the first phase output circuit 10 or the second phase output circuit 20, the interlock signal generated by the third phase output circuit 30 cannot be transmitted to the first phase output circuit 10 or the second phase output circuit 20. However, because the first phase power supply 201 and the second phase power supply 202 are both malfunctioning, the first phase output circuit 10 and the second phase output circuit 20 have both entered a stopped working state and are no longer subject to the control of the interlock signal generated by the third phase output circuit 30.

[0049] Therefore, regardless of which phase power supply malfunctions, only one of the three output circuits (first phase output circuit 10, second phase output circuit 20, and third phase output circuit 30) can operate normally and output the corresponding phase power supply.

[0050] In this embodiment of the application, the phase power supply without abnormality is determined as the target phase power supply, the phase output circuit corresponding to the target phase power supply is determined as the target phase output circuit, and the target phase output circuit is the phase output circuit that generates the interlock signal the fastest among the phase output circuits corresponding to the phase power supply without abnormality.

[0051] For example: If the first phase power supply 201 is normal, and the other phase power supplies are normal or abnormal, the first phase output circuit 10 generates the interlock signal in the shortest time, thus it is the target phase output circuit. If the first phase power supply 201 is abnormal, and the second phase power supply 202 and the third phase power supply 203 are both normal, the second phase output circuit 20 generates the interlock signal in less time than the third phase output circuit 30, thus it is the target phase output circuit. If the first phase power supply 201 is abnormal, the second phase power supply 202 is normal, and the third phase power supply 203 is abnormal, then the second phase output circuit 20 is the target phase output circuit. If the first phase power supply 201 is abnormal, the second phase power supply 202 is normal, and the third phase power supply 203 is abnormal, then the second phase output circuit 20 is the target phase output circuit. If the first phase power supply 201 is abnormal, the second phase power supply 202 is abnormal, and the third phase power supply 203 is normal, then the third phase output circuit 30 is the target phase output circuit.

[0052] The target phase output circuit responds to the input of the target phase power supply, transmits the target phase power supply and generates an interlock signal. The interlock signal is transmitted to other phase output circuits through the interlock bus electrically connected to the target phase output circuit, so that the other phase output circuits respond to the interlock signal and enter the stop working state. The target phase power supply supplies power to the load 300.

[0053] For example, if the first phase power supply 201 is normal, the target phase output circuit is the first phase output circuit 10, and the target phase power supply is the first phase power supply 201. The first phase output circuit 10 responds to the input of the first phase power supply 201, transmits the first phase power supply 201 to supply power to the load 300, and generates an interlock signal. The interlock signal is transmitted to the control terminal of the second phase output circuit 20 through the first interlock bus, causing it to enter a stop working state. The interlock signal is also transmitted to the control terminal of the third phase output circuit 30 through the second interlock bus, causing it to enter a stop working state. Therefore, the first phase power supply 201 is stably transmitted to the load 300 through the first phase output circuit 10, while the second phase power supply 202 and the third phase power supply 203 cannot be transmitted to the load 300 because their corresponding phase output circuits enter a stop working state, ensuring that only one phase power supply is stably output.

[0054] For example, if the first phase power supply 201 is abnormal while the second phase power supply 202 is normal, the target phase output circuit becomes the second phase output circuit 20, and the target phase power supply becomes the second phase power supply 202. The second phase output circuit 20 responds to the input of the second phase power supply 202, transmitting the second phase power supply 202 to power the load 300 and generating an interlock signal. This interlock signal is transmitted to the control terminal of the third phase output circuit 30 via the third interlock bus, causing it to enter a stop-operation state. Therefore, the second phase power supply 202 is stably transmitted to the load 300 through the second phase output circuit 20, the first phase power supply 201 cannot output due to the power supply abnormality, and the third phase power supply 203 cannot be transmitted to the load 300 because its corresponding phase output circuit has entered a stop-operation state, ensuring that only one phase power supply is stably output.

[0055] For example, if only one of the first phase power supply 201, the second phase power supply 202, and the third phase power supply 203 is normal, taking the third phase power supply 203 as an example, then the target phase output circuit is the third phase output circuit 30, the target phase power supply is the third phase power supply 203, the third phase output circuit 30 responds to the input of the third phase power supply 203, and transmits the third phase power supply 203 to supply power to the load 300, while the first phase power supply 201 and the second phase power supply 202 cannot output due to power supply abnormality.

[0056] In summary, when a phase is lost or an abnormality occurs in a certain phase, the target phase output circuit in the power output circuit 100 can suppress the output of the corresponding phase power by other phase output circuits and stably transmit the target phase power, thereby improving the stability of single-phase power output.

[0057] The circuit composition and structure of each phase output circuit are the same. The following embodiments use the target phase output circuit as an example to describe the specific circuit composition and structure of each phase output circuit.

[0058] Specifically, such as Figure 3 As shown, the target phase output circuit 40 includes a rectifier unit 401, a delay unit 402, a trigger unit 403, and a switch unit 404. The first end of the rectifier unit 401 is electrically connected to the first end of the delay unit 402, and the second end of the rectifier unit 401 is electrically connected to the second end of the delay unit 402 and the trigger unit 403, respectively. The trigger unit 403 is also electrically connected to the control terminal of the switch unit 404 and the corresponding interlock bus, respectively.

[0059] For example, the output terminal of the trigger unit of the first phase is electrically connected to the control terminal of the switch unit of the first phase, the first interlock bus and the second interlock bus respectively, and the output terminal of the trigger unit of the second phase is electrically connected to the control terminal of the switch unit of the second phase and the third interlock bus respectively.

[0060] The rectifier unit 401 performs step-down rectification on the target phase power supply and outputs the target DC voltage through its second terminal. The trigger unit 403 responds to the input of the target DC voltage, generating and outputting an interlock signal. This interlock signal acts on the control terminal of the switch unit 404, controlling the switch unit 404 to enter the conducting state, thereby allowing the target phase power supply to be transmitted to the load 300 via the switch unit 404. Simultaneously, the interlock signal is transmitted to other phase output circuits via an interlock bus electrically connected to the target phase output circuit 40, causing the other phase output circuits to respond to the interlock signal and enter a stop-operation state.

[0061] For example, if the target phase output circuit 40 is the first phase output circuit 10, and the target phase power supply 204 is the first phase power supply 201, then the rectifier unit of the first phase performs step-down rectification on the first phase power supply 201 to output the target DC voltage. The trigger unit of the first phase responds to the input of the target DC voltage, generates and outputs an interlock signal. This interlock signal causes the switching unit of the first phase to enter the conducting state, thereby allowing the first phase power supply 201 to be transmitted to the load 300 through the switching unit of the first phase. At the same time, the interlock signal is transmitted to the output circuit of the second phase through the second interlock bus, and to the third phase output circuit 30 through the third interlock bus, causing the second phase output circuit 20 to enter the stopped working state, and the third phase output circuit 30 to enter the stopped working state.

[0062] The delay unit 402 of the target phase output circuit 40 controls the timing of the output of the target DC voltage by the rectifier unit 401, thereby controlling the generation time of the interlock signal. The output time of the DC voltage by the first phase rectifier unit is shorter than that by the second phase rectifier unit. Therefore, the trigger unit of the first phase responds to the DC voltage earlier than the trigger unit of the second phase, and thus generates the interlock signal earlier. Similarly, the output time of the DC voltage by the second phase rectifier unit is shorter than that by the third phase rectifier unit. Therefore, the trigger unit of the second phase responds to the DC voltage earlier than the trigger unit of the third phase, and thus generates the interlock signal earlier. That is, the triggering unit of the first phase generates the interlock signal earlier than the triggering unit of the second phase, the triggering unit of the second phase generates the interlock signal earlier than the triggering unit of the third phase, the triggering unit of the first phase generates the interlock signal first, and apart from the triggering unit of the first phase, the triggering unit of the second phase generates the interlock signal first. In other words, if the triggering unit of the first phase, the triggering unit of the second phase, and the triggering unit of the third phase are in that order, the triggering unit of the preceding phase will generate the interlock signal first.

[0063] The delay unit 402 can be implemented in various ways, such as an RC delay circuit, a 555 timer delay circuit, a monostable multivibrator delay circuit, a transistor delay circuit, etc.

[0064] In some embodiments, such as Figure 4 As shown, the trigger unit 403 includes a voltage divider unit 4031 and a signal generation unit 4032. The voltage divider unit 4031 is electrically connected to the second terminal of the rectifier unit 401 and the control terminal of the signal generation unit 4032, respectively. The output terminal of the signal generation unit 4032 is also electrically connected to the control terminal of the switch unit 404 and the corresponding interlock bus.

[0065] Voltage divider unit 4031 responds to the input of the target DC voltage and generates a voltage divider signal. Signal generation unit 4032 responds to the input of the voltage divider signal and generates and outputs an interlock signal. This interlock signal controls switch unit 404 to enter the on state and is transmitted to other phase output circuits through the interlock bus electrically connected to the target phase output circuit 40, causing other phase output circuits to enter the stop working state in response to the interlock signal.

[0066] In this embodiment, the voltage divider unit 4031 can reduce a higher target DC voltage to a lower divided voltage signal, adapting to the different operating voltages required by different circuit components and reducing it to the stable voltage level required by the circuit components, preventing the circuit components from being affected by power supply voltage fluctuations. The signal generation unit 4032, triggered by the divided voltage signal, outputs a corresponding interlock signal to output the target phase power supply to the load 300 and suppress the operation of other phase output circuits, preventing other phase power supplies from being output, thereby ensuring that only one phase power supply is output to the load 300.

[0067] In some embodiments, please continue reading Figure 4 The target phase output circuit 40 also includes an indicator unit 405, wherein the indicator unit 405 is electrically connected to the second terminal of the rectifier unit 401, the delay unit 402 and the trigger unit 403 respectively, and the indicator unit 405 emits light in response to the input of the target DC voltage.

[0068] The indicator unit 405 illuminates when a target DC voltage is input, indicating which phase of the power supply is currently being output. For example, if the first phase output circuit 10 is the target phase output circuit 40, and the first phase power supply 201 is the target phase power supply 204, then the indicator unit for the first phase illuminates in response to the DC voltage input of the first phase, indicating that the first phase power supply 201 is currently supplying power to the load 300. If the second phase output circuit 20 is the target phase output circuit 40, and the second phase power supply 202 is the target phase power supply 204, then the indicator unit for the second phase illuminates in response to the DC voltage input of the second phase, indicating that the second phase power supply 202 is currently supplying power to the load 300. If the third phase output circuit 30 is the target phase output circuit 40, and the third phase power supply 203 is the target phase power supply 204, then the indicator unit for the third phase illuminates in response to the DC voltage input of the third phase, indicating that the third phase power supply 203 is currently supplying power to the load 300.

[0069] In this embodiment, an indicator unit 405 is used to visually display which phase of the power supply is currently outputting, making it easier to observe and monitor the power supply status.

[0070] Taking the first phase output circuit 10 as an example of the target phase output circuit 40, the specific circuit composition and connection relationship in the target phase output circuit 40 are described below. Here, the rectifier unit 401 is the rectifier unit 101 of the first phase, the delay unit 402 is the delay unit 102 of the first phase, the trigger unit 403 is the trigger unit 103 of the first phase, the switch unit 404 is the switch unit 104 of the first phase, the voltage divider unit 4031 is the voltage divider unit 1031 of the first phase, the signal generation unit 4032 is the signal generation unit 1032 of the first phase, the target phase power supply 204 is the first phase power supply PHASE1, the target AC voltage is the first AC voltage, and the target DC voltage is the first DC voltage.

[0071] like Figure 5 As shown, the first phase rectifier unit 101 includes a transformer X1, a rectifier bridge BR1, and a capacitor C1. The primary winding of the transformer X1 is connected to the first phase power supply PHASE1, the secondary winding of the transformer X1 is electrically connected to the input terminal of the rectifier bridge BR1, and the output terminal of the rectifier bridge BR1 is electrically connected to the capacitor C1.

[0072] The rectifier bridge BR1 includes diodes one through four, which are connected end to end to form a closed loop. Diodes one and three conduct during one half-cycle of the target phase power supply, while diodes two and four conduct during the other half-cycle. The output terminal of rectifier bridge BR1 is the common connection terminal of diodes one and four.

[0073] Transformer X1 steps down the first phase power supply PHASE1 to output the first AC voltage. Rectifier bridge BR1 then rectifies the first AC voltage to output a rectified DC voltage. This rectified DC voltage charges capacitor C1, causing capacitor C1 to output the first DC voltage.

[0074] The turns ratio of transformer X1 determines the magnitude of the first DC voltage. Therefore, different turns ratios can be set to meet different requirements for the first DC voltage.

[0075] Please continue reading. Figure 5 The delay unit 402 includes a current-limiting resistor (shown in the figure with the current-limiting resistor having a resistance of zero). The current-limiting resistor is connected in series between the output terminal of the rectifier bridge BR1 and the capacitor C1. The resistance of the current-limiting resistor of the first phase is less than the resistance of the current-limiting resistor of the second phase, and the resistance of the current-limiting resistor of the second phase is less than the resistance of the current-limiting resistor of the third phase.

[0076] The current-limiting resistor limits the charging time of capacitor C1. The larger the current-limiting resistor, the smaller the charging current, and the longer the charging time of capacitor C1. Therefore, the resistance value of the current-limiting resistor is directly proportional to the charging time of capacitor C1. Thus, the charging time of capacitor C1 in the first phase is faster than that in the second phase, and the charging time of capacitor C1 in the second phase is faster than that in the third phase. Consequently, the DC voltage output time of the first phase is faster than that of the second phase, and the DC voltage output time of the second phase is faster than that of the third phase.

[0077] To ensure the fastest DC voltage output of the first phase, the current-limiting resistor of the first phase can be zero, that is, no current-limiting resistor is set. The current-limiting resistor of the second phase can be less than that of the third phase.

[0078] In some embodiments, such as Figure 5 As shown, the rectifier unit 101 of the first phase includes a parallel resistor R14, which is connected in parallel with the capacitor C1. The parallel resistor R14 can help the capacitor C1 charge and discharge faster, so as to ensure that the trigger unit 103 of the first phase can respond faster, generate an interlock signal or turn off faster.

[0079] Please continue reading. Figure 5The voltage divider unit 1031 of the first phase includes a first voltage divider resistor R5 and a second voltage divider resistor R11, and the signal generation unit 1032 of the first phase includes a three-terminal adjustable voltage regulator U3. The first voltage divider resistor R5 and the second voltage divider resistor R11 are connected in series between the second terminal of the rectifier unit 101 of the first phase and ground. Specifically, one end of the first voltage divider resistor R5 is electrically connected to a capacitor C1, a current-limiting resistor, and a parallel resistor R14, respectively. The other end of the first voltage divider resistor R5 is electrically connected to one end of the second voltage divider resistor R11 and the control terminal of the three-terminal adjustable voltage regulator U3, and the other end of the second voltage divider resistor R11 is grounded. The anode of the three-terminal adjustable voltage regulator U3 is grounded, and the cathode of the three-terminal adjustable voltage regulator U3 is electrically connected to the control terminal of the switching unit 104 of the first phase and the corresponding interlock bus.

[0080] For example, the cathode of the three-terminal adjustable voltage regulator U3 of the first phase is electrically connected to the control terminal, the first interlock bus, and the second interlock bus of the first phase switching unit 104, respectively. The cathode of the three-terminal adjustable voltage regulator of the second phase is electrically connected to the control terminal and the third interlock bus of the second phase switching unit, respectively. The cathode of the three-terminal adjustable voltage regulator of the third phase is electrically connected to the control terminal of the third phase switching unit.

[0081] The first voltage divider resistor R5 and the second voltage divider resistor R11 divide the first DC voltage to generate a voltage divider signal. This voltage divider signal acts on the control terminal of the three-terminal adjustable voltage regulator U3, causing it to enter the conduction state, thereby pulling down the control terminal of the first phase switching unit 104 and generating an interlock signal, which is a low-level signal.

[0082] Please continue reading. Figure 5 The first phase switching unit 104 includes an optocoupler U1, resistors R1, R2, and R3, and a three-terminal bidirectional thyristor U2. The anode of the diode in the optocoupler U1 is connected to one end of resistor R3, and the other end of resistor R3 is used to connect to a first DC voltage. The cathode of the diode in the optocoupler is electrically connected to the output terminal of the first phase trigger unit 103, specifically to the cathode of the three-terminal adjustable voltage regulator U3, for connecting an interlock signal. The output terminal of the optocoupler U1 is electrically connected to the gate of the three-terminal bidirectional thyristor U2. The first anode of the three-terminal bidirectional thyristor U2 is used to connect to the first phase power supply PHASE1, and the second anode of the three-terminal bidirectional thyristor U2 is electrically connected to the load 300 for outputting the first phase power supply PHASE1. The collector of the optocoupler U1 is also electrically connected to the first anode of the three-terminal bidirectional thyristor U2 via resistor R1, and the output terminal of the optocoupler U1 is also electrically connected to the second anode of the three-terminal bidirectional thyristor U2 via resistor R2.

[0083] When the trigger unit 103 of the first phase generates a low-level interlock signal, the diode of the optocoupler U1 is turned on, and then the optocoupler U1 outputs a trigger signal, triggering the three-terminal bidirectional thyristor U2 to turn on, so that the first phase power supply PHASE1 is transmitted to the load 300 through the three-terminal bidirectional thyristor U2.

[0084] Please continue reading. Figure 5 The first phase indicator unit 105 includes a light-emitting diode (LED) D1. The anode of LED D1 is electrically connected to the second terminal of the first phase rectifier unit 101, and the cathode of LED D1 is electrically connected to the power supply terminal of the first phase switch unit 104. The power supply terminal of the first phase switch unit 104 is the anode of the diode of the optocoupler U1, that is, the cathode of LED D1 is connected to the anode of the diode of the optocoupler U1.

[0085] When the first phase rectifier unit 101 outputs the first DC voltage, the anode potential of the light-emitting diode D1 is high. If the diode of the optocoupler U1 is turned on, the cathode potential of the light-emitting diode D1 is pulled low, and the light-emitting diode D1 is turned on and then emits light, indicating that the phase output circuit that currently provides phase power to the load 300 is the phase output circuit in which the light-emitting diode emits light, that is, the first phase output circuit.

[0086] Please see Figure 6 , Figure 6 This is a schematic diagram of the circuit structure of a power output circuit provided in an embodiment of this application, as shown below. Figure 6 As shown, the power output circuit 100 includes a first phase output circuit 10, a second phase output circuit 20, and a third phase output circuit 30. The circuit composition and circuit structure of each phase output circuit are the same as those of the target phase output circuit 40.

[0087] Specifically, the first phase rectifier unit 101 of the first phase output circuit 10 includes a transformer X1, a rectifier bridge BR1, a capacitor C1, and a parallel resistor R14. The current limiting resistor in the first phase delay unit 102 has a resistance of zero (not shown in the figure). The first phase voltage divider unit 1031 includes resistors R5 and R11. The first phase signal generation unit 1032 is a three-terminal adjustable voltage regulator U3. The first phase switching unit 104 includes an optocoupler U1, resistors R1, R2, and R3, and a three-terminal bidirectional thyristor U2.

[0088] The second phase output circuit 20 includes a transformer X2, a rectifier bridge BR2, a capacitor C3, and a parallel resistor R13. The second phase delay unit 202 includes a current-limiting resistor R19. The second phase voltage divider unit 2031 includes resistors R9 and R15. The second phase signal generation unit 2032 is a three-terminal adjustable voltage regulator U7. The second phase switching unit 204 includes an optocoupler U5, resistors R10, R6, and R8, and a three-terminal bidirectional thyristor U8.

[0089] The third phase output circuit 30 includes a third phase rectifier unit 301 comprising a transformer X3, a rectifier bridge BR3, a capacitor C2, and a parallel resistor R22; a third phase delay unit 302 comprising a current-limiting resistor R20; a third phase voltage divider unit 3031 comprising resistors R17 and R18; a third phase signal generation unit 3032 comprising a three-terminal adjustable voltage regulator U9; and a third phase switching unit 304 comprising an optocoupler U4, resistors R7, R4, and R16, and a three-terminal bidirectional thyristor U6.

[0090] The cathode of the three-terminal adjustable voltage regulator U3 is electrically connected to the control terminal of the three-terminal adjustable voltage regulator U7 via a first interlock bus. The cathode of the three-terminal adjustable voltage regulator U3 is also electrically connected to the control terminal of the three-terminal adjustable voltage regulator U9 via a second interlock bus. The cathode of the three-terminal adjustable voltage regulator U7 is electrically connected to the control terminal of the three-terminal adjustable voltage regulator U9 via a third interlock bus. The component connections are the same as those in the first phase output circuit 10 in the above embodiment, and will not be repeated here.

[0091] Combination Figure 6 The working principle of the power output circuit 100 can be described as follows:

[0092] If no phase loss occurs, that is, when the first phase power supply PHSAE1, the second phase power supply PHSAE2, and the third phase power supply PHSAE3 are all present simultaneously, all three rectifier units operate normally. After passing through the current limiting unit, the DC voltage is output. However, the current limiting unit of the first phase is zero (no current resistance), so the DC voltage output of the first phase is the fastest. The three-terminal adjustable regulator U3 of the first phase is turned on first. The output terminal (pin 3) of the three-terminal adjustable regulator U3 is pulled low to ground, generating a low-level interlock signal. This interlock signal causes the optocoupler U1 of the first phase to enter the conducting state, which in turn causes the three-terminal bidirectional thyristor U2 to enter the conducting state. The first phase power supply PHSAE1 is transmitted to the load 300 through the three-terminal bidirectional thyristor U2, supplying power to the load 300.

[0093] Simultaneously, the interlock signal is transmitted via the first interlock bus to the control terminal (pin 1) of the three-terminal adjustable voltage regulator U7 of the second phase, causing the three-terminal adjustable voltage regulator U7 of the second phase to be in the off state. The interlock signal is also transmitted via the second interlock bus to the control terminal (pin 1) of the three-terminal adjustable voltage regulator U9 of the third phase, causing the three-terminal adjustable voltage regulator U9 of the third phase to be in the off state.

[0094] Therefore, the target phase output circuit is the first phase output circuit 10. Only when the first phase output circuit 10 is turned on, only the first phase power supply PHSAE1 supplies power to the load 300, thus achieving the purpose of extracting single-phase power.

[0095] If the first phase power supply PHSAE1 is normal, and one of the second phase power supply PHSAE2 or the third phase power supply PHSAE3 is lost (taking the loss of the third phase power supply PHSAE3 as an example), then the third phase output circuit 30 cannot output the third phase power supply PHSAE3. Meanwhile, the first phase power supply PHSAE1, which is not lost, allows the first phase rectifier unit 101 in the first phase output circuit 10 to perform normal step-down rectification. The three-terminal adjustable voltage regulator U3 is preferentially turned on, generating an interlock signal. This interlock signal causes the optocoupler U1 to enter the conducting state, which in turn causes the three-terminal bidirectional thyristor U2 to enter the conducting state. The first phase power supply PHSAE1 is transmitted to the load 300 through the three-terminal bidirectional thyristor U2, supplying power to the load 300.

[0096] At the same time, the optocoupler signal is transmitted to the control terminal (pin 1) of the three-terminal adjustable regulator U7 through the first interlock bus, pulling its control terminal low, so that the three-terminal adjustable regulator U7 cannot be turned on and is in the off state, and thus the second phase output circuit 20 cannot output the second phase power supply PHSAE2.

[0097] Therefore, the target phase output circuit is the first phase output circuit 10. Only when the first phase output circuit 10 is turned on, only the first phase power supply PHSAE1 supplies power to the load 300, thus achieving the purpose of extracting single-phase power.

[0098] If the first phase power supply PHSAE1 is lost, while the second phase power supply PHSAE2 and the third phase power supply PHSAE3 are both normal, the first phase output circuit 10 will not be able to output the first phase power supply PHSAE1. However, the second phase power supply PHSAE2, which is not lost, allows the second phase rectifier unit 201 in the second phase output circuit 20 to perform normal step-down rectification. The three-terminal adjustable regulator U7 is turned on, generating an interlock signal. This interlock signal causes the optocoupler U5 to enter the conducting state, which in turn causes the three-terminal bidirectional thyristor U8 to enter the conducting state. The second phase power supply PHSAE2 is then transmitted to the load 300 through the three-terminal bidirectional thyristor U8, supplying power to the load 300.

[0099] At the same time, the optocoupler signal is transmitted to the control terminal (pin 1) of the three-terminal adjustable regulator U9 through the third interlock bus, pulling its control terminal low, so that the three-terminal adjustable regulator U9 cannot be turned on and is in the off state, and thus the third phase output circuit 30 cannot output the third phase power supply PHSAE3.

[0100] Therefore, the target phase output circuit is the second phase output circuit 20. Only when the second phase output circuit 20 is turned on, only the second phase power supply PHSAE2 supplies power to the load 300, thus achieving the purpose of extracting single-phase power.

[0101] If the first phase power supply PHSAE1 is lost, and one of the second phase power supplies PHSAE2 or the third phase power supply PHSAE3 is lost (taking the loss of the third phase power supply PHSAE3 as an example), then the first phase output circuit 10 cannot output the first phase power supply PHSAE1, and the third phase output circuit 30 cannot output the third phase power supply PHSAE3. However, the second phase power supply PHSAE2, which is not lost, allows the second phase rectifier unit 201 in the second phase output circuit 20 to perform normal step-down rectification. The three-terminal adjustable voltage regulator U7 is turned on, generating an interlock signal. This interlock signal causes the optocoupler U5 to enter the conducting state, which in turn causes the three-terminal bidirectional thyristor U8 to enter the conducting state. The second phase power supply PHSAE2 is transmitted to the load 300 through the three-terminal bidirectional thyristor U8, supplying power to the load 300.

[0102] Therefore, the target phase output circuit is the second phase output circuit 20. Only when the second phase output circuit 20 is turned on, only the second phase power supply PHSAE2 supplies power to the load 300, thus achieving the purpose of extracting single-phase power.

[0103] In summary, when a phase is lost or an abnormality occurs in a certain phase, the target phase output circuit in this power output circuit can suppress the output of the corresponding phase power by other phase output circuits and stably transmit the target phase power, thereby improving the stability of single-phase power output.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above, which are not provided in detail for the sake of brevity; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A power output circuit, characterized in that, It includes a first-phase output circuit, a second-phase output circuit, a third-phase output circuit, a first interlock bus, a second interlock bus, and a third interlock bus. The output terminal of the first-phase output circuit is electrically connected to the control terminal of the second-phase output circuit via the first interlock bus, and is also electrically connected to the control terminal of the third-phase output circuit via the second interlock bus. The output terminal of the second-phase output circuit is electrically connected to the control terminal of the third-phase output circuit via the third interlock bus. The target phase output circuit responds to the input of the target phase power supply, transmits the target phase power supply and generates an interlock signal. The interlock signal is transmitted to other phase output circuits through an interlock bus electrically connected to the target phase output circuit, so that the other phase output circuits respond to the interlock signal and enter a stop working state. The target phase output circuit is the phase output circuit that generates the interlock signal fastest among the phase output circuits corresponding to the phase power supply without abnormality, and the time for the first phase output circuit to generate the interlock signal is less than the time for the second phase output circuit to generate the interlock signal, and the time for the second phase output circuit to generate the interlock signal is less than the time for the third phase output circuit to generate the interlock signal. The target phase output circuit includes a rectifier unit, a delay unit, a trigger unit, and a switching unit; The first end of the rectifier unit is electrically connected to the first end of the delay unit, the second end of the rectifier unit is electrically connected to the second end of the delay unit and the trigger unit, and the output end of the trigger unit is also electrically connected to the control end of the switch unit and the corresponding interlock bus. The rectifier unit performs step-down rectification on the target phase power supply to output a target DC voltage. The trigger unit responds to the input of the target DC voltage, generates and outputs the interlock signal, and the switch unit responds to the input of the interlock signal to enter the conduction state to transmit the target phase power supply. The delay unit is used to control the time when the rectifier unit outputs the target DC voltage, so as to control the generation time of the interlock signal. The time when the rectifier unit of the first phase outputs the DC voltage is less than the time when the rectifier unit of the second phase outputs the DC voltage, and the time when the rectifier unit of the second phase outputs the DC voltage is less than the time when the rectifier unit of the third phase outputs the DC voltage.

2. The power output circuit according to claim 1, characterized in that, The rectifier unit includes a transformer, a rectifier bridge, and a capacitor; The primary winding of the transformer is used to connect to the target phase power supply, the secondary winding of the transformer is electrically connected to the input terminal of the rectifier bridge, and the output terminal of the rectifier bridge is electrically connected to the capacitor. The transformer is used to step down the target phase power supply and output the target AC voltage. The rectifier bridge is used to rectify the target AC voltage and output the rectified DC voltage to charge the capacitor, so that the capacitor outputs the target DC voltage.

3. The power output circuit according to claim 2, characterized in that, The delay unit includes a current-limiting resistor, wherein the current-limiting resistor is connected in series between the output terminal of the rectifier bridge and the capacitor, and the resistance value of the current-limiting resistor of the first phase is less than the resistance value of the current-limiting resistor of the second phase, and the resistance value of the current-limiting resistor of the second phase is less than the resistance value of the current-limiting resistor of the third phase.

4. The power output circuit according to claim 1, characterized in that, The triggering unit includes a voltage divider unit and a signal generation unit; The voltage divider unit is electrically connected to the second terminal of the rectifier unit and the control terminal of the signal generation unit, respectively. The output terminal of the signal generation unit is also electrically connected to the control terminal of the switch unit and the corresponding interlock bus. The voltage divider unit generates a voltage divider signal in response to the input of the target DC voltage, and the signal generation unit generates and outputs the interlock signal in response to the input of the voltage divider signal.

5. The power output circuit according to claim 4, characterized in that, The voltage divider unit includes a first voltage divider resistor and a second voltage divider resistor, and the signal generation unit includes a three-terminal adjustable voltage regulator. The first voltage divider resistor and the second voltage divider resistor are connected in series between the second terminal of the rectifier unit and ground. The common connection terminal of the first voltage divider resistor and the second voltage divider resistor is electrically connected to the control terminal of the three-terminal adjustable voltage regulator. The anode of the three-terminal adjustable voltage regulator is grounded, and the cathode of the three-terminal adjustable voltage regulator is electrically connected to the control terminal of the switching unit and the corresponding interlock bus, respectively.

6. The power output circuit according to claim 1, characterized in that, The switching unit includes an optocoupler and a three-terminal bidirectional thyristor; The anode of the diode in the optocoupler is used to connect to the target DC voltage, the cathode of the diode in the optocoupler is used to connect to the interlock signal, the output terminal of the optocoupler is electrically connected to the gate of the triac, the first anode of the triac is used to connect to the target phase power supply, and the second anode of the triac is used to output the target phase power supply.

7. The power output circuit according to any one of claims 1-6, characterized in that, The target phase output circuit also includes an indicator unit, which is electrically connected to the second terminal of the rectifier unit and emits light in response to the input of the target DC voltage.

8. The power output circuit according to claim 7, characterized in that, The indicator unit includes a light-emitting diode (LED), the anode of which is electrically connected to the second terminal of the rectifier unit, and the cathode of which is connected to the power supply terminal of the switch unit.

9. A power supply system, characterized in that, Includes a three-phase power supply, a load, and a power output circuit as described in any one of claims 1-8; The first phase output circuit is connected between the first phase AC power and the load, the second phase output circuit is connected between the second phase AC power and the load, and the third phase output circuit is connected between the three-phase power supply and the load. The power output circuit is used to transmit the target phase power to supply power to the load.

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