Flyback power supply circuit and power supply system

Abstract

The present application discloses a flyback power supply circuit and power supply system, which relate to the field of switching power supplies. The flyback power supply circuit includes: a transformer, at least two primary circuits, multiple rectifier and filter circuits, and an interlocking circuit; each primary circuit is connected to one of at least two same-name end windings of the transformer, and each primary circuit includes: a power supply terminal, a protection component, and a control module. One end of the power supply terminal is connected to one end of the same-name end winding through the protection component, and the other end is connected to the other end of the same-name end winding through the control module; each primary circuit is used to control the transformer energy storage when the power supply terminal is powered on; each opposite-name end winding of the transformer is connected to a corresponding rectifier and filter circuit; an interlocking circuit is respectively connected to each primary circuit; and the interlocking circuit is used to control and lock the power supply terminals of the remaining primary circuits when it is detected that the power supply terminal in any primary circuit is powered on. This solution avoids the problem of conflict caused by multiple power supplies working simultaneously, thereby improving system reliability.

Description

Technical Field

[0001] The present invention generally relates to the technical field of switching power supplies, and in particular to a flyback power supply circuit and a power supply system. Background Art

[0002] With the rapid development of electronic technology, flyback power supplies have been widely used in numerous electronic devices due to their simple structure, low cost, and ability to achieve electrical isolation. These include common consumer electronics such as mobile phone chargers and tablet power adapters, as well as various small power modules used in industrial control. Among these applications, some require two input ports and two flyback power supplies to power the system separately. This is particularly true for bidirectional current transmitters and bidirectional charging stations, which require bidirectional flow of electrical energy during operation. This requires the power supply system to possess higher stability, reliability, and dynamic response capabilities.

[0003] Currently, for scenarios where energy flows in both directions, one approach is to set up two flyback power supplies, each connected to a corresponding port. When either power supply is powered, it starts up, and after startup, the other power supply is started up through the main power circuit. Another approach is to set up two flyback power supplies, one of which serves as the main power supply for the entire system, with its output port connected to the power supply port of the first flyback power supply via a backflow protection device. The other flyback power supply serves as the startup power supply for this flyback power supply, with its input port connected to the other power supply port and its output port connected to the power supply port of the first flyback power supply via a backflow protection device. However, both solutions require two flyback power supplies to achieve startup when either port is powered up. This results in a more complex circuit setup and higher redundancy, increasing circuit manufacturing costs. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a flyback power supply circuit and a power supply system.

[0005] In a first aspect, the present application provides a flyback power supply circuit, the flyback power supply circuit comprising: a transformer, the transformer comprising at least two same-name end windings and a plurality of opposite-name end windings;

[0006] At least two primary circuits, each of which is connected to one of at least two end windings with the same name, each of which includes: a power supply terminal, a protection component, and a control module, one end of the power supply terminal is connected to one end of the end winding with the same name through the protection component, and the other end of the power supply terminal is connected to the other end of the end winding with the same name through the control module; each primary circuit is configured to: when the power supply terminal is powered on, control the transformer to perform energy storage operation through the control module;

[0007] A plurality of rectifier and filter circuits, each of the opposite-end windings is connected to a corresponding rectifier and filter circuit; the rectifier and filter circuit is used to: when the power supply end is powered off, convert the AC voltage stored in the transformer into a DC voltage through the control module and output it to multiple loads;

[0008] An interlocking circuit is connected to each of the primary circuits respectively; the interlocking circuit is used to control and lock the power supply terminals of the remaining primary circuits when it is detected that the power supply terminal in any primary circuit is powered on.

[0009] In one embodiment, the control module further includes: a switching tube, a resistor, a control chip, and a ground terminal; the other end of the power supply terminal is connected to the source of the switching tube through the resistor, the drain of the switching tube is connected to the other end of the winding with the same name, the gate of the switching tube is connected to the control chip, the other end of the power supply terminal and one end of the resistor are respectively connected to the ground terminal; the interlock circuit is respectively connected to the control chip and the ground terminal.

[0010] In one embodiment, the at least two primary circuits include a first primary circuit and at least one second primary circuit;

[0011] The first primary circuit includes: a first power supply terminal, a first switch tube, a first resistor, a first protection component, a first control chip and a first ground terminal; the second primary circuit includes: a second power supply terminal, a second switch tube, a second resistor, a second protection component, a second control chip and a second ground terminal;

[0012] One end of the first power supply terminal is connected to one end of the same-name end winding through the first protection component, the other end of the first power supply terminal is connected to the source of the first switching tube through the first resistor, the gate of the first switching tube is connected to the first control chip, the drain of the first switching tube is connected to the other end of the same-name end winding, and the other end of the first power supply terminal and one end of the first resistor are respectively connected to the first ground terminal;

[0013] One end of the second power supply terminal is connected to one end of the other end winding of the same name through the second protection component, the other end of the second power supply terminal is connected to the source of the second switching tube through the second resistor, the gate of the second switching tube is connected to the second control chip, the drain of the second switching tube is connected to the other end of the other end winding of the same name, and the other end of the second power supply terminal and one end of the second resistor are respectively connected to the second ground terminal.

[0014] In one embodiment, the interlock circuit includes a first isolation optocoupler, a second isolation optocoupler, a third resistor, a fourth resistor, a first circuit, a second circuit, a third circuit, a fourth circuit, a first rectifier tube, and a second rectifier tube;

[0015] The first circuit is respectively connected to the first control chip, the first ground terminal, and one end of the third resistor; the other end of the third resistor is connected to the first isolation optocoupler; the first isolation optocoupler is further connected to the first voltage source, the cathode of the first rectifier tube, the second ground terminal, and the second circuit; the second circuit is further respectively connected to the second voltage source, the first compensation terminal, and the anode of the first rectifier tube;

[0016] The third circuit is respectively connected to the second control chip, the second ground terminal, and one end of the fourth resistor, the other end of the fourth resistor is connected to the second isolation optocoupler, the second isolation optocoupler is also connected to the second voltage source, the cathode of the second rectifier tube, the first ground terminal, and the fourth circuit, and the fourth circuit is also respectively connected to the first voltage source, the second compensation terminal, and the anode of the second rectifier tube.

[0017] In one embodiment, the first circuit is the same as the third circuit, and the second circuit is the same as the fourth circuit.

[0018] In one embodiment, the first circuit includes: a fifth resistor, a sixth resistor, a third switch tube, a fourth switch tube, a capacitor, and a third rectifier tube;

[0019] The first control chip is connected to the anode of the third rectifier tube, the cathode of the third rectifier tube is respectively connected to one end of the sixth resistor, the gate of the third switching tube, the source of the fourth switching tube, and one end of the capacitor through the fifth resistor, the other end of the sixth resistor is respectively connected to the first ground end, the other end of the capacitor, and the source of the third switching tube, the drain of the third switching tube is connected to the gate of the fourth switching tube, and the drain of the fourth switching tube is connected to the first isolation optocoupler through the third resistor.

[0020] In one embodiment, the second circuit includes: a seventh resistor, an eighth resistor, a fifth switch tube, and a sixth switch tube;

[0021] The cathode of the first rectifier tube is respectively connected to one end of the seventh resistor and the gate of the fifth switching tube, the second voltage source is respectively connected to the other end of the seventh resistor and the source of the fifth switching tube, the drain of the fifth switching tube is connected to the gate of the sixth switching tube through the eighth resistor, the source of the sixth switching tube is respectively connected to the second ground terminal and the first isolation optocoupler, and the drain of the sixth switching tube is connected to the first compensation terminal.

[0022] In one embodiment, the first isolation optocoupler includes: a light emitting diode and an isolation switch tube;

[0023] The first voltage source is connected to the anode of the light-emitting diode, the cathode of the light-emitting diode is respectively connected to the third resistor and the gate of the isolation switch tube, the source of the isolation switch tube is respectively connected to the second ground terminal and the second circuit, and the drain of the isolation switch tube is connected to one end of the first rectifier tube.

[0024] In one embodiment, each of the primary circuits is specifically configured to: when the power supply end is powered on, the control chip outputs a high level, and controls the transformer to perform energy storage operation through the control module;

[0025] When the power supply end is powered off, the control chip outputs a low level, and the AC voltage stored in the transformer is converted into a DC voltage through the control module and output to multiple loads.

[0026] In a second aspect, the present application provides a power supply system, comprising the flyback power supply circuit as described in the first aspect above.

[0027] The embodiments of the present application provide a flyback power supply circuit and a power supply system, which include: a transformer, at least two primary circuits, multiple rectifier and filter circuits, and an interlocking circuit. The transformer includes at least two same-name end windings and multiple opposite-name end windings. The primary circuit includes: a power supply end, a protection component, and a control module. One end of the power supply end is connected to one end of the same-name end winding through the protection component, and the other end of the power supply end is connected to one end of the same-name end winding through the protection component, and the other end of the power supply end is connected to the other end of the same-name end winding through the control module; each primary circuit is used to: when the power supply end is powered on, control the transformer to perform energy storage operation through the control module; each opposite-name end winding is connected to the corresponding rectifier and filter circuit; the rectifier and filter circuit is used to: when the power supply end is powered off, convert the AC voltage stored in the transformer into DC voltage through the control module and output it to multiple loads; the interlocking circuit is connected to each primary circuit respectively; the interlocking circuit is used to: when it is detected that the power supply end in any primary circuit is powered on, control and lock the power supply ends of the remaining primary circuits.

[0028] Compared with the prior art, the flyback power supply circuit provided in the present application utilizes a transformer comprising at least two like-end windings and multiple opposite-end windings to provide basic hardware support for bidirectional energy flow and power supply to multiple loads, and connects the like-end windings through at least two primary circuits, and each primary circuit includes a power supply terminal, a protection component, and a control module, so that when the power supply terminal is powered on, the control module controls the transformer energy storage to achieve effective energy storage when the energy is input to the other side for power supply; and by connecting the multiple opposite-end windings to the rectifier and filter circuit, when the power supply terminal is powered off, the AC voltage stored in the transformer is converted into DC and output to multiple loads, meeting the power requirements of different loads. Only one flyback power supply is required, and the bidirectional power conversion unit can be started when there is power at any port; and because an interlocking circuit is provided and connected to the primary circuit, when it is detected that a primary circuit power supply terminal is powered on, the remaining primary circuit power supply terminals are locked, avoiding the problem of conflict caused by multiple power supplies working simultaneously, improving system reliability, simplifying circuit control logic, and reducing circuit manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0030] Figure 1 A schematic diagram of the structure of a flyback power supply circuit in the related art provided in an embodiment of the present application;

[0031] Figure 2 A schematic diagram of the structure of a flyback power supply circuit provided in one embodiment of the present application;

[0032] Figure 3 A schematic structural diagram of a flyback power supply circuit provided in another embodiment of the present application;

[0033] Figure 4 A schematic diagram of the structure of an interlock circuit provided in one embodiment of the present application;

[0034] Figure 5 A schematic structural diagram of an interlock circuit provided in another embodiment of the present application;

[0035] Figure 6 This is a schematic structural diagram of an interlocking circuit provided in yet another embodiment of the present application.

[0036] Description of reference numerals:

[0037] Primary circuit 10; first primary circuit 11; second primary circuit 12; first control module 13; second control module 14; rectifier and filter circuit 20; interlock circuit 30; first isolation optocoupler 31; second isolation optocoupler 32; third resistor 33; fourth resistor 34; first circuit 35; second circuit 36; third circuit 37; fourth circuit 38; first rectifier 39; second rectifier 40; fifth resistor 351; sixth resistor 352; third switch 353; fourth switch 354; capacitor 355; third rectifier 356; seventh resistor 361; eighth resistor 362; fifth switch 363; sixth switch 364. DETAILED DESCRIPTION

[0038] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0039] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] Understandably, in applications where energy flows in both directions, such as new energy storage systems and on-board power supplies, bidirectional power conversion units must meet the requirement of "starting with power on either port." This is because the system may operate in bidirectional energy transfer mode, with either port A or port B potentially serving as the input source at any time. Therefore, the startup logic must be non-directional to ensure that the system can initialize normally even when powered from a single side.

[0041] Currently, there are two existing auxiliary power supply solutions. One involves providing two flyback power supplies (Power Supply 1 and Power Supply 2), connected to Port A and Port B, respectively. If power is present at Port A, Power Supply 1 activates, activating the main power circuit, which then powers Power Supply 2. Conversely, if power is present at Port B, Power Supply 2 activates, activating the main power circuit, which then drives Power Supply 1. Another solution involves providing two flyback power supplies (Power Supply 1 and Power Supply 2), one serving as the primary power supply for the entire system and the other as an auxiliary power supply. For example, the primary power supply (Power Supply 1) is connected to either Port A or Port B, providing the system's primary power supply, while the auxiliary power supply (Power Supply 2) is connected to the other port. Power Supply 2's output is connected to Power Supply 1's power supply terminal via a backflow prevention device, providing only initial energy for Power Supply 1 during startup. However, both of these solutions require two flyback power supplies to achieve startup with power present at either port. This results in high redundancy and high circuit manufacturing costs.

[0042] See Figure 1 As shown, Figure 1 This is a schematic diagram of a single-ended flyback switching power supply circuit in the related art. The circuit includes: an input power supply Vin_1, a field-effect transistor Q_1, a resistor R_1, a transformer T, and rectifier diodes D_3, ..., and D_n. The input power supply Vin_1 provides power to the circuit. Field-effect transistor Q_1 is controlled by a drive signal terminal DRV_1 and periodically switches on and off, enabling energy storage and transfer on the primary side of the transformer. R_1 is connected in series with Q_1 and generally performs current sampling or protection functions, such as limiting the current in Q_1 to prevent overcurrent damage. Transformer T has a primary winding and multiple secondary windings. The primary winding and Q_1 form the primary circuit, achieving power conversion and isolation. The secondary windings generate multiple output voltages using different turns ratios. Rectifier diodes D_3 and D_n rectify the AC signals output by their respective secondary windings, converting them into DC outputs. Vout_1...Vout_n are the multiple DC output voltages used to power the load. GND_1 is the ground reference point of the circuit and provides a potential reference.

[0043] When DRV_1 turns on Q_1, current flows from Vin_1 through Q_1 and R_1 into the primary winding of transformer T, storing electrical energy in the form of magnetic field energy. At this point, due to the same-name terminal relationship, diodes D_3 and D_n are reverse-biased and cut off in the secondary winding, resulting in no current output. When DRV_1 turns off Q_1, the magnetic field in the transformer rapidly changes, generating an induced electromotive force in the secondary winding. Diodes D_3 and D_n then forward-bias, converting the magnetic field energy into electrical energy. After diode rectification, the DC voltage is output to the load. By controlling the on and off time (duty cycle) of Q_1, the output voltage can be adjusted.

[0044] Based on the above-mentioned defects, the present application provides a flyback power supply circuit. Compared with the prior art, the flyback power supply circuit provided by the present application utilizes a transformer comprising at least two same-name end windings and multiple opposite-name end windings to provide basic hardware support for bidirectional energy flow and power supply to multiple loads, and connects the same-name end windings respectively through at least two primary circuits, and each primary circuit includes a power supply end, a protection component and a control module, so that when the power supply end is powered on, the control module controls the transformer energy storage to achieve effective energy storage when energy is input to one side for power supply; and by connecting multiple opposite-name end windings to a rectifier and filter circuit, when the power supply end is powered off, the AC voltage stored in the transformer is converted into DC and output to multiple loads, meeting the power requirements of different loads. Only one flyback power supply needs to be set up, and the bidirectional power conversion unit can be started when there is power at any port; and because an interlocking circuit is set up and connected to the primary circuit, when it is detected that a primary circuit power supply end is powered on, the power supply ends of the remaining primary circuits are locked, avoiding the conflict problem caused by multiple power supplies working at the same time, improving system reliability, simplifying circuit control logic, and reducing circuit manufacturing costs.

[0045] See Figure 2 As shown, Figure 2 A schematic diagram of the structure of a flyback power supply circuit provided in an embodiment of the present application. The flyback power supply circuit includes: a transformer T, at least two primary circuits 10, multiple rectifier and filter circuits 20, and an interlocking circuit 30. The transformer T includes at least two same-name end windings and multiple opposite-name end windings. Each primary circuit is connected to one of the at least two same-name end windings. Each primary circuit includes: a power supply terminal, a protection component, and a control module. One end of the power supply terminal is connected to one end of the same-name end winding through the protection component, and the other end of the power supply terminal is connected to the other end of the same-name end winding through the control module. Each primary circuit is configured to: when the power supply terminal is powered on, control the transformer to perform an energy storage operation through the control module.

[0046] Each opposite-end winding is connected to a corresponding rectifier and filter circuit 20; the rectifier and filter circuit 20 is used to: when the power end is powered off, convert the AC voltage stored in the transformer into a DC voltage through the control module and output it to multiple loads; the interlock circuit 30 is connected to each primary circuit respectively; the interlock circuit is used to: when it is detected that the power end in any primary circuit is powered on, control and lock the power ends of the remaining primary circuits.

[0047] It should be noted that transformer T includes at least two windings with the same end and multiple windings with opposite ends. The same-end windings are used to connect to the input port. The same-end ends of these windings are connected to ensure the same current direction. When any primary circuit is energized, the corresponding same-end winding independently stores energy, enabling bidirectional energy input. The multiple windings with opposite ends are used to output energy, which is converted into multiple DC voltages through rectifier and filter circuits to meet the needs of different loads.

[0048] Please continue to see Figure 2 As shown, the above-mentioned at least two primary circuits 10 include a first primary circuit 11 and at least one second primary circuit 12. The first primary circuit 11 includes: a first power supply end, a first protection component D1 and a first control module 13. The second primary circuit 12 includes: a second power supply end, a second protection component D2 and a second control module 14.

[0049] It should be noted that the first power supply terminal may be Vin1, and the second power supply terminal may be Vin2. The first power supply terminal Vin1 and the second power supply terminal Vin2 are respectively used to receive input voltages from different power sources. The first protection component and the second protection component are used to prevent reverse current flow to ensure circuit safety. They can both be diodes, fuses, or other components used to protect the circuit. The first control module and the second control module may include MOSFET switches and control circuits for controlling transformer energy storage based on the status of the power supply terminals.

[0050] Each opposite-end winding is connected to a rectifier and filter circuit. This circuit can include n (n ≥ 1) diodes and an output. For example, the first rectifier and filter circuit includes diode D_1 and a corresponding output, Vout1; the second rectifier and filter circuit includes diode D_2 and a corresponding output, Vout2; and the nth rectifier and filter circuit includes diode D_n and a corresponding output, Voutn. The rectifier and filter circuit efficiently converts the AC energy released by the transformer into a stable DC output. By using opposite-end windings with different turns ratios, multiple voltage levels (such as 5V, 12V, and 24V) can be simultaneously provided to meet diverse load requirements.

[0051] The interlock circuit is used to detect the power supply voltage of each primary circuit in real time. When it is detected that a primary circuit is powered on, it can output a low-level signal through an optocoupler or logic gate to forcibly shut down the control modules of the remaining primary circuits to prevent conflicts.

[0052] The above-mentioned control module also includes: a switching tube, a resistor, a control chip, and a ground terminal; the other end of the power supply terminal is connected to the source of the switching tube through the resistor, the drain of the switching tube is connected to the other end of the winding with the same name, the gate of the switching tube is connected to the control chip, the other end of the power supply terminal and one end of the resistor are respectively connected to the ground terminal; the interlock circuit is respectively connected to the control chip and the ground terminal.

[0053] It is understood that the first control module in the first primary circuit and the second control module in the second primary circuit can each include: a switch, a resistor, a control chip, and a ground terminal. Each primary circuit includes a corresponding switch, a power supply, a resistor, a control chip, and a ground terminal. The switch controls the flow of current, while the resistor ensures that the switch operates under the correct bias conditions. The control chip outputs a high or low level. When the power supply is powered on, the control chip outputs a high level; when the power supply is powered off, the control chip outputs a low level.

[0054] Each primary circuit is specifically used for: when the power supply end is powered on, the control chip outputs a high level, and controls the transformer to perform energy storage operations through the control module; when the power supply end is powered off, the control chip outputs a low level, and converts the AC voltage stored in the transformer into a DC voltage through the control module and outputs it to multiple loads.

[0055] Specifically, during operation of the above-mentioned flyback power supply circuit, when the power supply terminal in any primary circuit is powered on, the corresponding protection component is turned on, and current flows through the winding at the same end and enters the transformer T. The control chip starts working after detecting the input voltage. The control chip sends a drive signal, outputs a high level, and drives the corresponding switch tube to turn on. After the switch tube is turned on, the current flows into the transformer T through the winding at the same end, and the transformer starts to store energy. Among them, the interlocking circuit detects and processes the primary circuit in real time. When it is detected that the power supply terminal of a primary circuit is powered on, the power supply terminals of the remaining primary circuits are immediately locked, so that the control chips therein cannot send drive signals. This interlocking mechanism can ensure that only one power input port is working at the same time, preventing conflicts caused by powering two input ports at the same time.

[0056] It can be understood that when the power supply end of a primary circuit is powered on, the control chip sends a driving signal, that is, outputs a high level, which drives the switch tube to turn on and the transformer starts to store energy; when the power supply end of a primary circuit is powered off, the control chip sends a shutdown signal, that is, outputs a low level, which drives the switch tube to turn off, and converts the AC power into stable DC power through the rectifier and filter circuit, thereby providing multiple outputs for the load.

[0057] When the power supply is started, the system relies on the power circuit to maintain operation and ensure the stability of the output voltage. If the voltage of the input port disappears, if the other input port is powered on, the system will automatically switch to the other input port to ensure the continuous operation of the system.

[0058] The flyback power supply circuit and power supply system provided in the embodiments of the present application, compared with the prior art, utilize a transformer comprising at least two like-name end windings and multiple opposite-name end windings to provide basic hardware support for bidirectional energy flow and multi-load power supply, and respectively connect the like-name end windings through at least two primary circuits, and each primary circuit includes a power supply terminal, a protection component, and a control module, so that when the power supply terminal is powered on, the control module controls the transformer energy storage to achieve effective energy storage when energy is input to one side for power supply; and by connecting the multiple opposite-name end windings to the rectifier and filter circuit, when the power supply terminal is powered off, the AC voltage stored in the transformer is converted into DC and output to multiple loads, meeting the power requirements of different loads. Only one flyback power supply is required, and the bidirectional power conversion unit can be started when there is power at any port; and because an interlock circuit is provided and connected to the primary circuit, when it is detected that a primary circuit power supply terminal is powered on, the remaining primary circuit power supply terminals are locked, avoiding the problem of conflicts caused by multiple power supplies working simultaneously, improving system reliability, simplifying circuit control logic, and reducing circuit manufacturing costs.

[0059] In one embodiment, see Figure 3 As shown, the above-mentioned first primary circuit 11 includes: a first power supply terminal Vin1, a first switch tube Q1, a first resistor R1, a first protection component D1, a first control chip DRV1 and a first ground terminal GND1; the second primary circuit 12 includes: a second power supply terminal Vin2, a second switch tube Q2, a second resistor R2, a second protection component D2 and a second control chip DRV2 and a second ground terminal GND2.

[0060] One end of the first power supply terminal Vin1 is connected to one end of a winding with the same name through a first protection component D1. The other end of the first power supply terminal Vin1 is connected to the source of the first switching tube Q1 through a first resistor R1. The gate of the first switching tube Q1 is connected to the first control chip DRV1. The drain of the first switching tube Q1 is connected to the other end of the winding with the same name. The other end of the first power supply terminal Vin1 and one end of the first resistor R1 are respectively connected to the first ground terminal GND1.

[0061] One end of the second power supply terminal Vin2 is connected to one end of the other winding of the same name through the second protection component D2. The other end of the second power supply terminal Vin2 is connected to the source of the second switch tube Q2 through the second resistor R2. The gate of the second switch tube Q2 is connected to the second control chip DRV2. The drain of the second switch tube Q2 is connected to the other end of the other winding of the same name. The other end of the second power supply terminal Vin2 and one end of the second resistor R2 are respectively connected to the second ground terminal GND2.

[0062] As an implementable method, when the first power supply terminal Vin1 is powered on, the first protection component D1 is turned on, and the current flows through the first protection component D1 through the same-name end winding and enters the transformer T. The first control chip DRV1 starts working after detecting the input voltage. The first control chip DRV1 sends a drive signal, outputs a high level, and drives the first switch tube Q1 to turn on through the first resistor R1. The current forms a loop from Vin1 through D1, the same-name end winding of the transformer T, Q1, and R1, and the electrical energy is stored in the transformer T in the form of magnetic field energy, that is, the transformer starts to store energy.

[0063] When the second power supply terminal Vin2 is powered on, the second protection component D2 is turned on, and the current flows through the second protection component D2 through the same-name end winding and enters the transformer T. The second control chip DRV2 starts working after detecting the input voltage. The second control chip DRV2 sends a drive signal, outputs a high level, and drives the second switch tube Q2 to turn on through the second resistor R2. The current flows from Vin2 through D2, the other same-name end winding of the transformer T, Q2, and R2 to form a loop. The electrical energy is stored in the transformer T in the form of magnetic field energy, that is, the transformer starts to store energy.

[0064] As another possible implementation method, when the first power supply terminal Vin1 is powered off, the first control chip DRV1 starts working after detecting no input voltage. The first control chip DRV1 sends a shutdown signal and outputs a low level, and the first switch tube Q1 is turned off. After the first switch tube Q1 is turned off, the energy stored in the transformer T is transferred to the rectifier and filter circuit 20 through the opposite-end winding. The rectifier and filter circuit 20 converts AC power into stable DC power, providing complex multi-channel outputs.

[0065] When the second power supply terminal Vin2 is powered off, the second control chip DRV2 starts working after detecting no input voltage. The second control chip DRV2 sends a shutdown signal and outputs a low level, then the second switch tube Q2 is turned off. After the second switch tube Q2 is turned off, the energy stored in the transformer T is transferred to the rectifier and filter circuit through the opposite-end winding. The rectifier and filter circuit converts AC power into stable DC power, providing complex multi-channel outputs.

[0066] Among them, the interlock circuit 30 detects and processes the primary circuit in real time. When it detects that the power supply end of a primary circuit is powered on, it immediately locks the power supply ends of the remaining primary circuits, so that the control chips therein cannot send drive signals. This interlock mechanism can ensure that only one power input port is working at the same time, preventing conflicts caused by two input ports being powered at the same time.

[0067] This embodiment replaces the traditional dual-flyback power supply architecture with a single flyback power supply. A special transformer and related circuitry enable dual-port energy input, simplifying the circuit structure. Interlocking circuits centrally manage the primary circuits, eliminating the complex startup coordination and control logic between multiple power supplies. This simplifies circuit control and prevents faults caused by conflicts between multiple power supplies. When a primary circuit fault occurs, it can be promptly locked to prevent further malfunction. By reducing the number of flyback power supplies, the number of components, such as transformers, switches, and control chips, is also reduced, lowering material procurement costs.

[0068] In one embodiment, see Figure 4 As shown, Figure 4 Schematic diagram of the interlock circuit provided in an embodiment of the present application. The interlock circuit includes a first isolation optocoupler 31, a second isolation optocoupler 32, a third resistor 33, a fourth resistor 34, a first circuit 35, a second circuit 36, a third circuit 37, a fourth circuit 38, a first rectifier 39, and a second rectifier 40.

[0069] The first circuit 35 is respectively connected to the first control chip, the first ground terminal, and one end of the third resistor 33. The other end of the third resistor 33 is connected to the first isolation optocoupler 31. The first isolation optocoupler 31 is also connected to the first voltage source, the cathode of the first rectifier tube 39, the second ground terminal, and the second circuit 36. The second circuit 36 ​​is also respectively connected to the second voltage source, the first compensation terminal, and the anode of the first rectifier tube 39.

[0070] The third circuit 37 is respectively connected to the second control chip, the second ground terminal, and one end of the fourth resistor 34. The other end of the fourth resistor 34 is connected to the second isolation optocoupler 32. The second isolation optocoupler 32 is also connected to the second voltage source, the cathode of the second rectifier tube 40, the first ground terminal, and the fourth circuit 38. The fourth circuit 38 is also respectively connected to the first voltage source, the second compensation terminal, and the anode of the second rectifier tube 40.

[0071] It should be noted that the first and second voltage sources described above act as reference voltage sources, providing a stable baseline voltage for the circuit and ensuring that all circuit components operate at appropriate voltage levels. The first and second control chips described above are driver chips, configured to output high or low voltage levels. These chips control the on and off switching of the power switches in the circuit through a series of circuit components (such as diodes, resistors, and MOSFETs).

[0072] When the first control chip is at a high level and certain conditions are met, the signal passes through components such as diodes, turning on the corresponding MOSFET and allowing current to pass; when the first control chip is at a low level, the MOSFET is turned off, cutting off the current path. The working principle of the second control chip is similar to that of the first control chip. The first compensation terminal and the second compensation terminal are current compensation terminals. They detect the actual current in the circuit by connecting relevant circuit components and feed back the detected signal to the control circuit. When the current in the circuit fluctuates or deviates from the set value, the second compensation terminal or the first compensation terminal will feed back the signal to the control circuit. The control circuit adjusts the duty cycle and other parameters of the driver chip according to the feedback signal, thereby achieving compensation and regulation of the current, keeping the current in the circuit stable, and ensuring reliable operation of the circuit.

[0073] The first and second ground terminals provide ground reference points for the circuit and serve as the baseline potential for all voltage measurements within the circuit. The potential at each point in the circuit is relative to the ground terminal, and good grounding ensures signal stability within the circuit. The first circuit 35 is identical to the third circuit 37, and the second circuit 36 ​​is identical to the fourth circuit 38. This means that the internal structure of the first circuit 35 is identical to that of the third circuit 37, and the internal structure of the second circuit 36 ​​is identical to that of the fourth circuit 38. This internal structure can include the various circuit elements and the connections between them.

[0074] Among them, see Figure 5 As shown, the above-mentioned first isolation optocoupler 31 includes: a light-emitting diode and an isolation switch tube; the first voltage source is connected to the anode of the light-emitting diode, the cathode of the light-emitting diode is respectively connected to the third resistor 33 and the gate of the isolation switch tube, the source of the isolation switch tube is respectively connected to the second ground terminal and the second circuit 36, and the drain of the isolation switch tube is connected to one end of the first rectifier tube 39.

[0075] It will be appreciated that the first isolating optocoupler 31 provides electrical isolation, isolating the control signal of the first primary circuit (the circuit associated with the first control chip) from the second primary circuit. When the first control chip of the first primary circuit sends a signal, it is transmitted to the first isolating optocoupler 31 via the first circuit 35 and the third resistor 33. This prevents electrical interference between different circuits and improves circuit reliability. For example, in a high-voltage power supply system, it can prevent interference between high-voltage side signals and the low-voltage control side. The second isolating optocoupler 32, similar to the first isolating optocoupler 31, is used to isolate the signals of the second primary circuit from the first primary circuit. Signals from the second control chip are received via the third circuit 37 and the fourth resistor 34, achieving electrical isolation and ensuring that the signals on both sides of the circuit do not interfere with each other.

[0076] The third resistor 33 works in conjunction with the first isolating optocoupler 31 to provide current limiting and signal matching. It limits the current flowing into the first isolating optocoupler 31, preventing damage to the optocoupler. It also adjusts the signal strength so that the optocoupler accurately responds to the signal from the first circuit 35. The fourth resistor 34 works in conjunction with the second isolating optocoupler 32, sharing the same function as the third resistor 33. It limits the current flowing into the second isolating optocoupler 32, protecting the optocoupler and appropriately adjusting the signal to ensure proper operation of the optocoupler.

[0077] The first rectifier 39 performs both rectification and unidirectional conduction. In the interlock circuit, when the first isolation optocoupler 31 outputs a signal, the first rectifier 39 prevents reverse current flow, ensuring that the current flows into the second circuit 36 ​​along the specified path. At the same time, in some cases, the signal can be rectified to meet the operating requirements of the relevant components in the second circuit 36. The second rectifier 40 functions similarly to the first rectifier 39. When the second isolation optocoupler 32 outputs a signal, it prevents reverse current flow, ensuring unidirectional signal transmission to the fourth circuit 38, and can also rectify the signal to meet the operating conditions of the components in the fourth circuit 38.

[0078] The first circuit 35 serves as a signal input and distribution circuit, receiving signals from the first control chip and distributing them to the third resistor 33 and the first ground terminal. At the same time, it provides a ground reference for the first control chip to ensure stable signal transmission and normal operation. The second circuit 36 ​​receives signals from the first isolation optocoupler 31 through the first rectifier 39 and further processes the signals. At the same time, the second circuit is also connected to the second voltage source and the first compensation terminal. It is also responsible for coordinating the signal relationships between the various components to ensure the normal operation of the circuit. The third circuit 37 has similar functions to the first circuit 35, and the fourth circuit 38 has similar functions to the second circuit 36.

[0079] When the first primary circuit is powered on, the first control chip generates a signal, which is transmitted through the first circuit 35 to the third resistor 33. After current limiting by the third resistor 33, the signal is input to the first isolating optocoupler 31. The first isolating optocoupler 31 then conducts, transmitting the signal to the second circuit 36. After the signal passes through the first rectifier 39 to prevent reverse current interference, it enters the second circuit 36. At this point, the second circuit 36 ​​further processes the signal, ensuring that the second voltage source and the first compensation terminal receive the corresponding signal. This signal is fed back to the control module of the second primary circuit via the first compensation terminal, locking the second primary circuit (e.g., turning off the switch in the second primary circuit) to prevent it from starting, thus achieving an interlocking function.

[0080] When the second primary circuit is powered on, the second control chip generates a signal, which is transmitted via the third circuit 37 to the fourth resistor 34. After current limiting by the fourth resistor 34, the signal is input into the second isolation optocoupler 32. The second isolation optocoupler 32 conducts, transmitting the signal to the fourth circuit 38. After the signal passes through the second rectifier 40 to prevent reverse current interference, it enters the fourth circuit 38. After processing the signal, the fourth circuit 38 transmits it to the first voltage source and the second compensation terminal. This signal is fed back to the control module of the first primary circuit via the second compensation terminal, locking the first primary circuit and preventing it from starting, thus achieving interlocking.

[0081] In this embodiment, by providing a first isolation optocoupler and a second isolation optocoupler, electrical isolation can be achieved, effectively preventing electromagnetic interference between different circuits, improving system stability and reliability, and using rectifiers, resistors and other components to accurately control the signal flow and strength to ensure the accurate implementation of the interlocking function, avoid conflicts and failures caused by the simultaneous operation of multiple primary circuits, and improve system safety.

[0082] In one embodiment, see Figure 6 As shown, the first circuit includes: a fifth resistor 351 , a sixth resistor 352 , a third switch tube 353 , a fourth switch tube 354 , a capacitor 355 , and a third rectifier tube 356 .

[0083] The first control chip is connected to the anode of the third rectifier tube 356. The cathode of the third rectifier tube 356 is respectively connected to one end of the sixth resistor 352, the gate of the third switch tube 353, the source of the fourth switch tube 354, and one end of the capacitor 355 through the fifth resistor 351. The other end of the sixth resistor 352 is respectively connected to the first ground end, the other end of the capacitor 355, and the source of the third switch tube 353. The drain of the third switch tube 353 is connected to the gate of the fourth switch tube 354. The drain of the fourth switch tube 354 is connected to the first isolation optocoupler 31 through the third resistor 33.

[0084] Specifically, the fifth resistor 351 acts as a current-limiting resistor, limiting the current flowing into the gate of the third switch 353. When the first control chip outputs a high level, current flows through the third rectifier 356 and the fifth resistor 351 to the gate of the third switch 353. The fifth resistor 351 prevents excessive current from damaging the switch. The sixth resistor 352 provides a bias for the third switch 353, ensuring its stability under different operating conditions. When the first control chip outputs a low level, the sixth resistor 352 provides a discharge path for the gate of the third switch 353, accelerating its shutdown process. The third switch 353 acts as a signal amplification and conversion element. When the first control chip outputs a high level, the third switch 353 turns on, grounding the gate of the fourth switch 354 (through the drain-source path of the third switch 353), thereby controlling the on / off state of the fourth switch 354. The fourth switch 354 acts as a power output stage, controlling the signal flow to the first isolation optocoupler 31. When the third switch tube 353 is turned on, the gate of the fourth switch tube 354 is pulled low, turning it on and allowing current to flow to the first isolation optocoupler 31 through the third resistor 33 ; otherwise, the fourth switch tube 354 is turned off.

[0085] Capacitor 355 plays a filtering and delay role. When the signal of the first control chip jumps, capacitor 355 can smooth the voltage change and prevent high-frequency interference from causing malfunction of the switch tube. For example, when the first control chip changes from a low level to a high level, capacitor 355 needs to be charged to a certain voltage value to slowly turn on the third switch tube 353 to reduce switching losses. The third rectifier tube 356 is used to prevent current from flowing in reverse and ensure unidirectional transmission of the signal. When the first control chip outputs a high level, current is allowed to flow to the fifth resistor 351; when the first control chip outputs a low level, current is prevented from flowing back from the fifth resistor 351 to the first control chip to protect the control chip.

[0086] As an implementation, when the first control chip outputs a high level, current flows from the first control chip through the third rectifier 356 and the fifth resistor 351 to the gate of the third switch 353. The gate voltage of the third switch 353 increases. When it exceeds the threshold voltage, it turns on, pulling the gate voltage of the fourth switch 354 down (to near the first ground potential). The gate-source voltage of the fourth switch 354 becomes negative (Vgs < 0), meeting the MOSFET turn-on condition, and the fourth switch 354 turns on. Current flows from the power supply (through the third resistor 33) through the drain-source path of the fourth switch 354 to the first isolation optocoupler 31, triggering the optocoupler to turn on and transmitting a signal to the other side of the interlock circuit.

[0087] As another possible implementation, when DRV1 outputs a low level, the third rectifier 356 is turned off, preventing reverse current flow. Capacitor 355 discharges through the sixth resistor 352, and the gate voltage of the third switch 353 gradually decreases to the off state. The gate voltage of the fourth switch 354 gradually increases (approaching the power supply voltage). When Vgs > 0, the fourth switch 354 turns off. The current path is cut off, the first isolation optocoupler 31 stops operating, and the interlock circuit releases control of the other side of the circuit.

[0088] The first circuit in this embodiment achieves signal conversion and isolation from the control chip to the isolation optocoupler through a clever combination of resistors, MOSFETs, capacitors, and rectifiers. Its design balances signal conversion, circuit protection, and anti-interference capabilities, making it suitable for a variety of scenarios requiring electrical isolation and signal conversion.

[0089] In one embodiment, the second circuit 36 ​​includes a seventh resistor 361 , an eighth resistor 362 , a fifth switch 363 , and a sixth switch 364 .

[0090] The cathode of the first rectifier tube 39 is respectively connected to one end of the seventh resistor 361 and the gate of the fifth switching tube 363. The second voltage source is respectively connected to the other end of the seventh resistor 361 and the source of the fifth switching tube 363. The drain of the fifth switching tube 363 is connected to the gate of the sixth switching tube 364 through the eighth resistor 362. The source of the sixth switching tube 364 is connected to the second ground terminal and the first isolation optocoupler 31. The drain of the sixth switching tube 364 is connected to the first compensation terminal.

[0091] It should be noted that the seventh resistor 361 acts as a current-limiting and biasing resistor, limiting the current flowing into the gate of the fifth switching transistor 363 and protecting the switching transistor from excessive current shocks. It also provides a suitable bias voltage for the fifth switching transistor 363, ensuring stable operation within its normal operating range. For example, when a signal is input to the cathode of the first rectifier 39, the seventh resistor 361 limits the current flowing into the gate of the fifth switching transistor 363. The eighth resistor 362 performs signal conditioning and current limiting functions. It appropriately adjusts the output signal of the fifth switching transistor 363 and transmits it to the gate of the sixth switching transistor 364. At the same time, it limits the current flowing into the gate of the sixth switching transistor 364, protecting the switching transistor.

[0092] The fifth switching transistor 363 acts as a signal amplification and conversion device. When a suitable voltage signal is input to the cathode of the first rectifier 39, the gate voltage of the fifth switching transistor 363 increases. If it exceeds its threshold voltage, the switch turns on. At this point, it amplifies the signal and transmits it to the sixth switching transistor 364 through the eighth resistor 362. The sixth switching transistor 364 acts as a power output stage, controlling the signal flow to the first compensation terminal. When the fifth switching transistor 363 turns on and the gate voltage of the sixth switching transistor 364 is reduced through the eighth resistor 362, the sixth switching transistor 364 turns on, allowing the signal to flow from its drain to the first compensation terminal; otherwise, the sixth switching transistor 364 turns off.

[0093] In this embodiment, when a signal is input to the cathode of the first rectifier 39 (typically a signal transmitted after the first isolation optocoupler 31 is turned on), current flows through the seventh resistor 361 to the gate of the fifth switch 363. If the gate voltage of the fifth switch 363 exceeds its threshold voltage, the fifth switch 363 turns on. At this point, current flows from the source (connected to the second voltage source) to the drain of the fifth switch 363, transmitting the signal to the gate of the sixth switch 364 through the eighth resistor 362. The gate voltage of the sixth switch 364 is pulled down by the fifth switch 363 and the eighth resistor 362. When Vgs (gate-source voltage) reaches its turn-on threshold, the sixth switch 364 turns on. The signal flows from the drain of the sixth switch 364 to the first compensation terminal, achieving signal transmission and control functions. When the signal at the cathode of the first rectifier 39 disappears or weakens, the gate voltage of the fifth switch 363 decreases, causing it to turn off. The gate voltage of the sixth switch 364 increases, causing it to turn off, cutting off the signal flow to the first compensation terminal.

[0094] In this embodiment, the second circuit realizes the signal conversion and control function from the cathode of the first rectifier tube to the first compensation terminal by providing the seventh resistor, the eighth resistor, the fifth switch tube and the sixth switch tube. It fully considers the requirements of signal conversion, protection circuit and anti-interference, and is suitable for a variety of circuit systems that require precise signal control and conversion.

[0095] On the other hand, an embodiment of the present application provides a power supply system, which includes the flyback power supply circuit provided by the above embodiment.

[0096] Specifically, the power supply system may further include other chips, which may be processor chips, sensor chips, storage chips, communication chips or control chips, for realizing functions such as computing, storage, communication, sensing and control.

[0097] The power supply system provided in this embodiment includes the above-mentioned flyback power supply circuit, which includes: a transformer, at least two primary circuits, multiple rectifier and filter circuits, and an interlocking circuit. The transformer includes at least two same-name end windings and multiple opposite-name end windings. The primary circuit includes: a power supply end, a protection component, and a control module. One end of the power supply end is connected to one end of the same-name end winding through the protection component, and the other end of the power supply end is connected to one end of the same-name end winding through the protection component, and the other end of the power supply end is connected to the other end of the same-name end winding through the control module; each primary circuit is used to: when the power supply end is powered on, control the transformer to perform energy storage operation through the control module; each opposite-name end winding is connected to the corresponding rectifier and filter circuit; the rectifier and filter circuit is used to: when the power supply end is powered off, convert the AC voltage stored in the transformer into DC voltage through the control module and output it to multiple loads; the interlocking circuit is connected to each primary circuit respectively; the interlocking circuit is used to: when it is detected that the power supply end in any primary circuit is powered on, control and lock the power supply ends of the remaining primary circuits.

[0098] Compared with the prior art, the flyback power supply circuit provided in the present application utilizes a transformer comprising at least two like-name end windings and multiple opposite-name end windings to provide basic hardware support for bidirectional energy flow and power supply to multiple loads, and connects the like-name end windings through at least two primary circuits, and each primary circuit includes a power supply terminal, a protection component and a control module, so that when the power supply terminal is powered on, the control module controls the transformer energy storage to achieve effective energy storage when energy is input to one side for power supply; and by connecting multiple opposite-name end windings to a rectifier and filter circuit, when the power supply terminal is powered off, the AC voltage stored in the transformer is converted into DC and output to multiple loads, meeting the power requirements of different loads. Only one flyback power supply needs to be set up, and the bidirectional power conversion unit can be started when there is power at any port; and because an interlocking circuit is set up and connected to the primary circuit, when it is detected that a primary circuit power supply terminal is powered on, the remaining primary circuit power supply terminals are locked, avoiding the problem of conflict caused by multiple power supplies working simultaneously, improving system reliability, simplifying circuit control logic, and reducing circuit manufacturing costs.

[0099] It should be noted that although the operations of the present method are described in a particular order in the accompanying drawings, this does not require or imply that the operations must be performed in that particular order, or that all of the illustrated operations must be performed to achieve the desired results. Rather, the steps depicted in the flowcharts may be performed in a different order. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into a single step, and / or a single step may be broken down into multiple steps.

[0100] In summary, the present application provides a flyback power supply circuit and a power supply system. Compared with the prior art, the flyback power supply circuit uses a transformer comprising at least two same-name end windings and multiple opposite-name end windings to provide basic hardware support for bidirectional energy flow and multi-load power supply, and connects the same-name end windings through at least two primary circuits, and each primary circuit includes a power supply terminal, a protection component and a control module, so that when the power supply terminal is powered on, the control module controls the transformer energy storage to achieve effective energy storage when energy is input to one side for power supply; and by connecting multiple opposite-name end windings to a rectifier and filter circuit, when the power supply terminal is powered off, the AC voltage stored in the transformer is converted into DC and output to multiple loads, meeting the power requirements of different loads. Only one flyback power supply needs to be set up, and the bidirectional power conversion unit can be started when there is power at any port; and because an interlocking circuit is set up and connected to the primary circuit, when it is detected that a primary circuit power supply terminal is powered on, the remaining primary circuit power supply terminals are locked, avoiding the problem of conflict caused by multiple power supplies working simultaneously, improving system reliability, simplifying circuit control logic, and reducing circuit manufacturing costs.

[0101] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

Claims

1. A flyback power supply circuit, characterized in that: The flyback power supply circuit comprises: A transformer, comprising at least two windings of the same name and a plurality of windings of different names; At least two primary circuits, each of which is connected to one of at least two end windings with the same name, each of which includes: a power supply terminal, a protection component, and a control module, one end of the power supply terminal is connected to one end of the end winding with the same name through the protection component, and the other end of the power supply terminal is connected to the other end of the end winding with the same name through the control module; each primary circuit is configured to: when the power supply terminal is powered on, control the transformer to perform energy storage operation through the control module; A plurality of rectifier and filter circuits, each of the opposite-end windings is connected to a corresponding rectifier and filter circuit; the rectifier and filter circuit is used to: when the power supply end is powered off, convert the AC voltage stored in the transformer into a DC voltage through the control module and output it to multiple loads; An interlocking circuit is connected to each of the primary circuits respectively; the interlocking circuit is used to control and lock the power supply terminals of the remaining primary circuits when it is detected that the power supply terminal in any primary circuit is powered on.

2. The flyback power supply circuit according to claim 1, wherein: The control module also includes: a switching tube, a resistor, a control chip, and a ground terminal; the other end of the power supply terminal is connected to the source of the switching tube through the resistor, the drain of the switching tube is connected to the other end of the winding with the same name, the gate of the switching tube is connected to the control chip, the other end of the power supply terminal and one end of the resistor are respectively connected to the ground terminal; the interlock circuit is respectively connected to the control chip and the ground terminal.

3. The flyback power supply circuit according to claim 1, wherein: The at least two primary circuits include a first primary circuit and at least one second primary circuit; The first primary circuit includes: a first power supply terminal, a first switch tube, a first resistor, a first protection component, a first control chip and a first ground terminal; the second primary circuit includes: a second power supply terminal, a second switch tube, a second resistor, a second protection component, a second control chip and a second ground terminal; One end of the first power supply terminal is connected to one end of the same-name end winding through the first protection component, the other end of the first power supply terminal is connected to the source of the first switching tube through the first resistor, the gate of the first switching tube is connected to the first control chip, the drain of the first switching tube is connected to the other end of the same-name end winding, and the other end of the first power supply terminal and one end of the first resistor are respectively connected to the first ground terminal; One end of the second power supply terminal is connected to one end of the other end winding of the same name through the second protection component, the other end of the second power supply terminal is connected to the source of the second switching tube through the second resistor, the gate of the second switching tube is connected to the second control chip, the drain of the second switching tube is connected to the other end of the other end winding of the same name, and the other end of the second power supply terminal and one end of the second resistor are respectively connected to the second ground terminal.

4. The flyback power supply circuit according to claim 3, wherein: The interlock circuit includes: a first isolation optocoupler, a second isolation optocoupler, a third resistor, a fourth resistor, a first circuit, a second circuit, a third circuit, a fourth circuit, a first rectifier tube, and a second rectifier tube; The first circuit is respectively connected to the first control chip, the first ground terminal, and one end of the third resistor; the other end of the third resistor is connected to the first isolation optocoupler; the first isolation optocoupler is further connected to a first voltage source, a cathode of the first rectifier tube, the second ground terminal, and the second circuit; the second circuit is further respectively connected to a second voltage source, a first compensation terminal, and an anode of the first rectifier tube; The third circuit is respectively connected to the second control chip, the second ground terminal, and one end of the fourth resistor, the other end of the fourth resistor is connected to the second isolation optocoupler, the second isolation optocoupler is also connected to the second voltage source, the cathode of the second rectifier tube, the first ground terminal, and the fourth circuit, and the fourth circuit is also respectively connected to the first voltage source, the second compensation terminal, and the anode of the second rectifier tube.

5. The flyback power supply circuit according to claim 4, wherein: The first circuit is the same as the third circuit, and the second circuit is the same as the fourth circuit.

6. The flyback power supply circuit according to claim 4, wherein: The first circuit includes: a fifth resistor, a sixth resistor, a third switch tube, a fourth switch tube, a capacitor, and a third rectifier tube; The first control chip is connected to the anode of the third rectifier tube, the cathode of the third rectifier tube is respectively connected to one end of the sixth resistor, the gate of the third switching tube, the source of the fourth switching tube, and one end of the capacitor through the fifth resistor, the other end of the sixth resistor is respectively connected to the first ground end, the other end of the capacitor, and the source of the third switching tube, the drain of the third switching tube is connected to the gate of the fourth switching tube, and the drain of the fourth switching tube is connected to the first isolation optocoupler through the third resistor.

7. The flyback power supply circuit according to claim 4, wherein: The second circuit includes: a seventh resistor, an eighth resistor, a fifth switch tube, and a sixth switch tube; The cathode of the first rectifier tube is respectively connected to one end of the seventh resistor and the gate of the fifth switching tube, the second voltage source is respectively connected to the other end of the seventh resistor and the source of the fifth switching tube, the drain of the fifth switching tube is connected to the gate of the sixth switching tube through the eighth resistor, the source of the sixth switching tube is respectively connected to the second ground terminal and the first isolation optocoupler, and the drain of the sixth switching tube is connected to the first compensation terminal.

8. The flyback power supply circuit according to claim 4, wherein: The first isolation optocoupler includes: a light emitting diode and an isolation switch tube; The first voltage source is connected to the anode of the light-emitting diode, the cathode of the light-emitting diode is respectively connected to the third resistor and the gate of the isolation switch tube, the source of the isolation switch tube is respectively connected to the second ground terminal and the second circuit, and the drain of the isolation switch tube is connected to one end of the first rectifier tube.

9. The flyback power supply circuit according to claim 2, wherein: Each of the primary circuits is specifically configured to: when the power supply end is powered on, the control chip outputs a high level, and controls the transformer to perform energy storage operation through the control module; When the power supply end is powered off, the control chip outputs a low level, and the AC voltage stored in the transformer is converted into a DC voltage through the control module and output to multiple loads.

10. A power supply system, characterized in that: The flyback power supply circuit comprises the flyback power supply circuit according to any one of claims 1 to 9.

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