Flyback switching power supply and cross regulation rate control method and circuit thereof

Abstract

The invention discloses a flyback switching power supply and a cross regulation rate control method and circuit thereof, and belongs to the technical field of switching power supplies, the switching power supply comprises at least one main path output and one auxiliary path output, and the method comprises the following steps: detecting a first load state of the main path output and a second load state of the auxiliary path output; according to the first load state and the second load state, dynamically controlling the connection and disconnection of a controllable dummy load circuit connected in parallel with the main circuit output; and when the first load state represents that the main circuit is in a light-load or no-load state and the second load state represents that the auxiliary circuit is in a heavy-load state, controlling the controllable dummy load circuit to access the main circuit for output. The dummy load is dynamically connected to the main path, so that the cross adjustment rate of the multi-path flyback power supply is effectively improved when the main path is in light load and the auxiliary path is in heavy load, and the multi-path flyback power supply has low power consumption and high stability.

Description

Technical Field

[0001] This invention belongs to the field of switching power supply technology, and more specifically, relates to a flyback switching power supply and its cross-regulation control method and circuit. Background Technology

[0002] In switching power supply design, especially in multi-output switching power supply systems, there is a cross-regulation problem caused by load changes between the main and auxiliary circuits. When the auxiliary circuit is heavily loaded while the main circuit is lightly loaded or even unloaded, the main circuit output voltage will fluctuate significantly, affecting system stability and the normal operation of the load devices.

[0003] To alleviate this problem, existing technologies typically employ a fixed dummy load to maintain the minimum load requirement of the main circuit. However, this approach suffers from high power consumption, low efficiency, and an inability to dynamically adapt to load changes, making it difficult to meet the design requirements of power supplies that offer high efficiency, energy saving, and stable output.

[0004] An existing cross-regulation control scheme for flyback switching power supplies adjusts the auxiliary circuit voltage by dynamically adding a dummy load to the auxiliary circuit output. The drawback of this scheme is that directly applying the dummy load to the auxiliary circuit can cause a simultaneous increase in the output current of both the main and auxiliary circuits, thereby increasing the risk of rectifier diode overcurrent and transformer overload, necessitating additional margin in the design. Furthermore, if this scheme uses a single main circuit feedback, it is difficult to effectively handle operating conditions where the main circuit is lightly loaded and the auxiliary circuit is heavily loaded, and the cross-regulation problem still exists.

[0005] Therefore, there is an urgent need for a solution that can effectively improve the cross-adjustment rate problem, especially under light load conditions on the main road and heavy load conditions on the auxiliary road, while avoiding the risk of coordinated sudden changes in the main and auxiliary road currents. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a flyback switching power supply and its cross-regulation control method and circuit.

[0007] The present invention adopts the following technical solution.

[0008] A first aspect of the present invention provides a method for controlling the cross-regulation of a flyback switching power supply, the switching power supply including at least one main output and one auxiliary output, the method comprising: Detect the first load state of the main output and the second load state of the auxiliary output; Based on the first load state and the second load state, dynamically control the connection and disconnection of the controllable dummy load circuit connected in parallel with the main output; When the first load state indicates that the main circuit is in a light load or no load state, and the second load state indicates that the auxiliary circuit is in a heavy load state, the controllable dummy load circuit is controlled to connect to the main circuit output.

[0009] Optionally, detecting the first load state of the main output includes: Sample the current output from the main circuit to generate a first current sampling signal; The first current sampling signal is compared with the first reference signal to determine whether the main circuit is in a light-load or no-load state. If the first current sampling signal is not greater than the first reference signal, then the main circuit is determined to be in a light-load or no-load state.

[0010] Optionally, detecting the second load state of the auxiliary output includes: The current output from the auxiliary circuit is sampled to generate a second current sampling signal; The second current sampling signal is compared with the second reference signal to determine whether the auxiliary circuit is under heavy load. If the second current sampling signal is not less than the second reference signal, then the auxiliary circuit is determined to be in a heavy load state.

[0011] A second aspect of the present invention provides a flyback switching power supply cross-regulation control circuit for implementing the flyback switching power supply cross-regulation control method described in the first aspect of the present invention, comprising: The system comprises a main path status detection module, an auxiliary path status detection module, a logic control module, and a dummy load execution module, wherein: The main road status detection module is used to detect the first load status of the main road output; The auxiliary road status detection module is used to detect the second load status of the auxiliary road output; The logic control module is connected to the main road status detection module and the auxiliary road status detection module, and is used to generate control signals based on the first load status and the second load status. The dummy load execution module is connected to the logic control module and the main output, and is used to connect or disconnect the controllable dummy load circuit to the main output in response to the control signal.

[0012] Optionally, the main path status detection module includes a first sampling resistor and a first signal conditioning and comparison circuit, wherein: The first sampling resistor is set in the main output circuit to sense the current of the main output and generate a corresponding first sampling voltage; The first signal conditioning and comparison circuit is connected to the first sampling resistor and is used to amplify and condition the first sampling voltage, and compare the conditioned signal with the first reference voltage to output a logic signal characterizing the first load state.

[0013] Optionally, the auxiliary path status detection module includes a second sampling resistor and a second signal conditioning and comparison circuit, wherein: The second sampling resistor is set in the circuit of the auxiliary output to sense the current of the auxiliary output and generate a corresponding second sampling voltage; The second signal conditioning and comparison circuit is connected to the second sampling resistor and is used to amplify and condition the second sampling voltage, and compare the conditioned signal with the second reference voltage to output a logic signal characterizing the second load state.

[0014] Optionally, the dummy load execution module includes a power resistor and a control switch, wherein: The power resistor and the control switch are connected in series to form a branch, and the branch is connected in parallel with the output terminal of the main circuit. The control terminal of the control switch is connected to the logic control module and is used to receive control signals sent by the logic control module to turn the branch on or off. When the first load state indicates that the main output is in a light load or no load state, and the second load state indicates that the auxiliary output is in a heavy load state, the logic control module generates the control signal for turning on the control switch; The dummy load execution module responds to the control signal by turning on the control switch and connecting the power resistor as a dummy load to the main output.

[0015] A third aspect of the present invention provides a flyback switching power supply, comprising a cross-regulation control circuit for a flyback switching power supply as described in the second aspect of the present invention.

[0016] A fourth aspect of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when loaded onto the processor, implements a flyback switching power supply cross-regulation control method according to a first aspect of the present invention.

[0017] The fifth aspect of the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements a flyback switching power supply cross-regulation control method according to the first aspect of the present invention.

[0018] Compared with the prior art, the beneficial effects of the present invention include at least the following: 1. This invention detects the load status of the main and auxiliary circuits and dynamically connects a dummy load when the main circuit is lightly loaded / unloaded and the auxiliary circuit is heavily loaded. This effectively solves the problem of deterioration of the cross-regulation rate of multi-output flyback switching power supplies under the condition of light load on the main circuit and heavy load on the auxiliary circuit, and achieves low power consumption and high efficiency dynamic load compensation.

[0019] 2. This invention achieves accurate judgment of the main circuit's light load or no load state by sampling the main circuit output current and comparing it with the first reference signal, providing a reliable detection basis for dynamic dummy load control.

[0020] 3. This invention achieves accurate identification of the overload state of the auxiliary circuit by sampling the output current of the auxiliary circuit and comparing it with the second reference signal, ensuring that the dummy load is only put into operation under necessary conditions and avoiding false triggering.

[0021] 4. This invention provides a flyback switching power supply cross-regulation control circuit. Through the coordinated work of the main circuit status detection module, the auxiliary circuit status detection module, the logic control module, and the dummy load execution module, the hardware implementation of the method is realized, thereby improving the system's reliability and response speed.

[0022] 5. By connecting a signal conditioning and comparison circuit after the first sampling resistor, this invention achieves high-precision sampling and status judgment of the main current, thereby improving the stability and anti-interference capability of the detection.

[0023] 6. By connecting a signal conditioning and comparison circuit after the second sampling resistor, the present invention achieves reliable sampling and overload judgment of the auxiliary current, thereby enhancing the adaptability of the system.

[0024] 7. This invention constructs a dummy load branch by connecting a power resistor and a control switch in series, and dynamically connects / disconnects the main output under the control of the logic control module, thereby realizing a low-loss and high-reliability dummy load execution mechanism.

[0025] 8. This invention provides a flyback switching power supply that integrates the above-mentioned cross-regulation control circuit, which significantly improves the stability and energy efficiency of multi-output power supplies under complex load conditions.

[0026] 9. The present invention provides an electronic device that implements the above control method through a program, enabling existing devices to obtain cross-regulation rate optimization capabilities through software upgrades, thereby expanding application scenarios.

[0027] 10. The present invention provides a computer-readable storage medium for storing a program that implements the above control method, which facilitates the standardization, batch deployment and system integration of the method. Attached Figure Description

[0028] Figure 1 This is a flowchart of a method provided according to an embodiment of the present invention; Figure 2 This is a circuit diagram provided according to an embodiment of the present invention, which includes: The components are: first resistor R1, second resistor R2, third resistor R3, first sampling resistor R4, fifth resistor R5, power resistor R6, seventh resistor R7, eighth resistor R8, second sampling resistor R9, tenth resistor R10, driver chip U1, first comparator U2, second comparator U3, and control switch UND1. Figure 3 This is a schematic diagram of an improved feedback network provided according to an embodiment of the present invention, which includes: Eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, fourteenth resistor R14, TL431 reference source and optocoupler. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0030] In Embodiment 1, this invention provides a method for controlling the cross-regulation of a flyback switching power supply, wherein the switching power supply includes at least one main output and one auxiliary output, such as... Figure 1 As shown, the method includes the following steps: Step 1: Detect the first load state of the main output and the second load state of the auxiliary output.

[0031] Preferably, detecting the first load state of the main output includes: Sample the current output from the main circuit to generate a first current sampling signal; The first current sampling signal is compared with the first reference signal to determine whether the main circuit is in a light-load or no-load state. If the first current sampling signal is not greater than the first reference signal, then the main circuit is determined to be in a light-load or no-load state.

[0032] Preferably, detecting the second load state of the auxiliary output includes: The current output from the auxiliary circuit is sampled to generate a second current sampling signal; The second current sampling signal is compared with the second reference signal to determine whether the auxiliary circuit is under heavy load. If the second current sampling signal is not less than the second reference signal, then the auxiliary circuit is determined to be in a heavy load state.

[0033] For example, the first reference signal is set to 10% of the rated output current of the main circuit, and the second reference signal is set to 80% of the rated output current of the auxiliary circuit.

[0034] Step 2: Based on the first load state and the second load state, dynamically control the connection and disconnection of the controllable dummy load circuit connected in parallel with the main output.

[0035] Step 3: When the first load state indicates that the main circuit is in a light load or no load state, and the second load state indicates that the auxiliary circuit is in a heavy load state, control the controllable dummy load circuit to connect to the main circuit output.

[0036] It should be noted that this invention effectively solves the problems of high power consumption and inability to adapt to dynamic loads in the traditional fixed dummy load method by real-time detection of the load status of the main and auxiliary circuits and dynamic connection of dummy loads when the main circuit is lightly loaded / unloaded and the auxiliary circuit is heavily loaded, thus achieving efficient and intelligent cross-regulation rate control.

[0037] In Embodiment 2, this invention provides a flyback switching power supply cross-regulation control circuit for implementing the flyback switching power supply cross-regulation control method described in Embodiment 1, comprising: The system comprises a main path status detection module, an auxiliary path status detection module, a logic control module, and a dummy load execution module, wherein: The main road status detection module is used to detect the first load status of the main road output; The auxiliary road status detection module is used to detect the second load status of the auxiliary road output; The logic control module is connected to the main road status detection module and the auxiliary road status detection module, and is used to generate control signals based on the first load status and the second load status. The dummy load execution module is connected to the logic control module and the main output, and is used to connect or disconnect the controllable dummy load circuit to the main output in response to the control signal.

[0038] It should be noted that this invention, through modular design, separates load detection, logic control, and dummy load execution functions, achieving flexible configuration and high reliability of the control circuit, and is applicable to various flyback power supply topologies.

[0039] Preferably, the main path status detection module includes a first sampling resistor and a first signal conditioning and comparison circuit, wherein: The first sampling resistor is set in the main output circuit to sense the current of the main output and generate a corresponding first sampling voltage; The first signal conditioning and comparison circuit is connected to the first sampling resistor and is used to amplify and condition the first sampling voltage, and compare the conditioned signal with the first reference voltage to output a logic signal characterizing the first load state.

[0040] It should be noted that the present invention achieves high-precision sampling and light-load judgment of the main circuit current by combining the first sampling resistor with the signal conditioning and comparison circuit, thus providing an accurate input signal for dynamic dummy load control.

[0041] Preferably, the auxiliary path status detection module includes a second sampling resistor and a second signal conditioning and comparison circuit, wherein: The second sampling resistor is set in the circuit of the auxiliary output to sense the current of the auxiliary output and generate a corresponding second sampling voltage; The second signal conditioning and comparison circuit is connected to the second sampling resistor and is used to amplify and condition the second sampling voltage, and compare the conditioned signal with the second reference voltage to output a logic signal characterizing the second load state.

[0042] It should be noted that the present invention achieves reliable detection and heavy load identification of auxiliary circuit current by combining the second sampling resistor with the signal conditioning and comparison circuit, ensuring that the system only starts the dummy load under specific load conditions.

[0043] Preferably, the dummy load execution module includes a power resistor and a control switch, wherein: The power resistor and the control switch are connected in series to form a branch, and the branch is connected in parallel with the output terminal of the main circuit. The control terminal of the control switch is connected to the logic control module and is used to receive control signals sent by the logic control module to turn the branch on or off. When the first load state indicates that the main output is in a light load or no load state, and the second load state indicates that the auxiliary output is in a heavy load state, the logic control module generates the control signal for turning on the control switch; The dummy load execution module responds to the control signal by turning on the control switch and connecting the power resistor as a dummy load to the main output.

[0044] Preferably, the control switch is a MOSFET.

[0045] It should be noted that this invention uses a power resistor and a MOSFET connected in series to form a controllable dummy load branch, which enables dynamic connection and disconnection at the main output terminal, thereby stabilizing the output voltage and minimizing additional power consumption.

[0046] Preferably, the logic control module is a microcontroller (MCU).

[0047] In a typical embodiment of the present invention, a controllable dummy load circuit consisting of a power resistor and a MOSFET switch connected in series is connected in parallel at the main output terminal. The on and off states of the MOSFET are determined by a logic control module (e.g., an MCU) based on the load states of the main and auxiliary circuits.

[0048] The logic control module determines whether the auxiliary circuit is under heavy load by detecting the output current of the auxiliary circuit.

[0049] Preferably, the overload threshold can be set to more than 80% of the rated output current of the auxiliary circuit.

[0050] Meanwhile, the logic control module detects the main output current to determine whether the main circuit is in a no-load or light-load state. Its light-load threshold can be set to less than 10% of the rated output current of the main circuit.

[0051] It should be noted that the core of the control logic designed in this invention is that the dummy load is only activated when the specific condition of the main road being lightly loaded or unloaded and the auxiliary road being heavily loaded is met simultaneously.

[0052] For example, in practical applications, when a wireless module (such as WIFI) connected to the main circuit enters a sleep and disconnected state, or when a display device (such as a color screen) significantly increases the power consumption of the auxiliary circuit due to frequent operation and backlight brightening, the main circuit may be under very light load while the auxiliary circuit enters a heavy load, which will trigger a dummy load connection.

[0053] Conversely, under all other load condition combinations, the dummy load remains disconnected. This is because in a qualified switching power supply design, load conditions that are not primarily light on the main load and heavily on the auxiliary load typically do not cause a significant deterioration in the cross-regulation. This design ensures that the dummy load is only activated when necessary, minimizing unnecessary energy loss.

[0054] When the logic control module determines that the main circuit is lightly / no-loaded and the auxiliary circuit is heavily loaded, it will output a high-level signal (or a valid enable signal) to drive the MOSFET to turn on, thereby connecting the power resistor as a dummy load to the main circuit output terminal, providing a minimum load path for the main circuit to stabilize the output voltage. Once the auxiliary circuit load decreases or the main circuit load increases, the logic control module will output a low-level signal to turn off the MOSFET and remove the dummy load.

[0055] The control logic can be implemented either by software programming and integration into a microcontroller (MCU) or a dedicated power management chip (PMIC), or by pure hardware circuitry.

[0056] As an extended implementation scheme, the method described in this invention can be implemented using purely hardware circuits, such as... Figure 3As shown, as an extended implementation mode of the present invention, the cross-regulation rate can also be improved by modifying the feedback network.

[0057] The core of this method is: changing the traditional single-path (main path) voltage feedback to a weighted feedback in which the main path output voltage and the auxiliary path output voltage participate together with certain weights. Specifically: As Figure 3 shown, the weighting is achieved through a resistor voltage division network. Let the main path output voltage be V1, the auxiliary path output voltage be V2, the feedback target reference voltage be 2.5V (common error amplifier reference), the expected weight of the main path voltage be p (0 < p < 1), and the weight of the auxiliary path voltage be (1 - p).

[0058] Then the values of resistors R11 and R12 in the feedback network can be calculated according to the following formula: R11 = (V1 - 2.5) * R13 / (2.5 * p) R12 = (V2 - 2.5) * R13 / (2.5 * (1 - p)) Making the feedback voltage a weighted combination of V1 and V2, this feedback voltage is sent to the switching power supply control chip after being isolated by the TL431 reference source and the optocoupler, so as to indirectly adjust the coupling relationship of the multiple output voltages.

[0059] While this kind of weighted feedback improves the coupling performance of multiple outputs, it will introduce the stability problem of the main path output voltage. The qualitative reason is that: the original single-path feedback system only focuses on stabilizing the main path voltage V1 and has isolation for auxiliary path disturbances. After introducing the auxiliary path voltage V2 to participate in the feedback, any load mutation or noise of the auxiliary path will directly interfere with the voltage regulation loop of the main path through the feedback network, which is equivalent to introducing an additional disturbance source into the main path control loop.

[0060] Quantitatively, the characteristics of the system closed-loop transfer function change, which may reduce the phase margin or gain margin, resulting in an increase in the ripple of the main path output voltage, overshoot in the dynamic response or even oscillation.

[0061] To eliminate the above unstable effects, an additional DCDC voltage stabilizing circuit can be added after the main path output of the weighted feedback control. The input of this DCDC circuit is connected to the main path output terminal regulated by the weighted feedback loop, and its output is the finally stable voltage that is secondarily regulated and provided to the load. This design achieves the balance between high-precision stability of the main path output and improvement of the multiple cross-regulation performance at the cost of adding one more power conversion link.

[0062] This extended embodiment provides another technical path to solve the cross-regulation rate problem and enriches the implementation modes of the present invention.

[0063] It should be noted that this invention further optimizes the coupling performance of multiple outputs by introducing a weighted feedback mechanism for the main and auxiliary paths, and, combined with the subsequent DC-DC voltage regulator circuit, achieves a balance between high-precision stability of the main output voltage and cross-adjustment performance.

[0064] Embodiment 3 of the present invention provides a flyback switching power supply, which includes the cross-regulation control circuit of the flyback switching power supply described in Embodiment 2.

[0065] Embodiment 4 of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded onto the processor, it implements a flyback switching power supply cross-regulation control method according to Embodiment 1.

[0066] Embodiment 5 of the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements a flyback switching power supply cross-regulation control method according to Embodiment 1.

[0067] In Embodiment 6, this invention provides an application example of a flyback switching power supply cross-regulation control circuit, such as... Figure 2 As shown, the circuit includes: The system comprises a main path status detection module, an auxiliary path status detection module, a logic control module, and a dummy load execution module, wherein: The main road status detection module is used to detect the first load status of the main road output; The auxiliary road status detection module is used to detect the second load status of the auxiliary road output; The logic control module is connected to the main road status detection module and the auxiliary road status detection module, and is used to generate control signals based on the first load status and the second load status. The dummy load execution module is connected to the logic control module and the main output, and is used to connect or disconnect the controllable dummy load circuit to the main output in response to the control signal.

[0068] Specifically, the main path status detection module includes a first sampling resistor R4 and a first signal conditioning and comparison circuit; The first signal conditioning and comparison circuit includes a first resistor R1, a second resistor R2, and a first comparator U2.

[0069] The comparator and its peripheral components form a differential amplifier circuit, which measures the potential difference across the sampling resistor to calculate the main circuit current. Taking the main circuit current detection circuit as an example, the formula for calculating the current is:

[0070] When selecting the first sampling resistor R4, a smaller resistance value should be chosen to ensure the efficiency of the switching power supply. Its nominal power should be greater than 1.2 times the product of the maximum output current and the resistance value.

[0071] Specifically, the auxiliary path status detection module includes a second sampling resistor R9 and a second signal conditioning and comparison circuit; The second signal conditioning and comparison circuit includes a seventh resistor R7, an eighth resistor R8, and a second comparator U3.

[0072] Specifically, the logic control module is the driver chip U1.

[0073] Specifically, the dummy load execution module includes a control switch UND1 and a power resistor R6, where the power resistor R6 is a dummy load.

[0074] For example, the control switch UND1 is a MOS.

[0075] Furthermore, the relevant parameter settings for MOS include: Assuming the main output is 12V, VDS should be greater than 18V, and the maximum continuous drain current should be greater than 80% of the rated current of the main output. Since a gate voltage of 15V is selected in this example, the MOS turn-on voltage is 4V. A voltage of 15V can enable the MOS to conduct completely, reducing losses.

[0076] In addition, the circuit also includes a fifth resistor R5, a third resistor R3, and a tenth resistor R10. The fifth resistor R5 is the main circuit load, the third resistor R3 is the current limiting resistor, and the tenth resistor R10 is the auxiliary circuit load.

[0077] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A method for controlling the cross-regulation rate of a flyback switching power supply, wherein the switching power supply includes at least one main output and one auxiliary output, characterized in that, The method includes: Detect the first load state of the main output and the second load state of the auxiliary output; Based on the first load state and the second load state, dynamically control the connection and disconnection of the controllable dummy load circuit connected in parallel with the main output; When the first load state indicates that the main circuit is in a light load or no load state, and the second load state indicates that the auxiliary circuit is in a heavy load state, the controllable dummy load circuit is controlled to connect to the main circuit output.

2. The method for controlling the cross-regulation rate of a flyback switching power supply according to claim 1, characterized in that: The detection of the first load state of the main output includes: Sample the current output from the main circuit to generate a first current sampling signal; The first current sampling signal is compared with the first reference signal to determine whether the main circuit is in a light-load or no-load state. If the first current sampling signal is not greater than the first reference signal, then the main circuit is determined to be in a light-load or no-load state.

3. The method for controlling the cross-regulation rate of a flyback switching power supply according to claim 1, characterized in that: Detecting the second load state of the auxiliary output includes: The current output from the auxiliary circuit is sampled to generate a second current sampling signal; The second current sampling signal is compared with the second reference signal to determine whether the auxiliary circuit is under heavy load. If the second current sampling signal is not less than the second reference signal, then the auxiliary circuit is determined to be in a heavy load state.

4. A flyback switching power supply cross-regulation control circuit, used to implement the flyback switching power supply cross-regulation control method according to any one of claims 1-3, characterized in that, include: The system comprises a main path status detection module, an auxiliary path status detection module, a logic control module, and a dummy load execution module, wherein: The main road status detection module is used to detect the first load status of the main road output; The auxiliary road status detection module is used to detect the second load status of the auxiliary road output; The logic control module is connected to the main road status detection module and the auxiliary road status detection module, and is used to generate control signals based on the first load status and the second load status. The dummy load execution module is connected to the logic control module and the main output, and is used to connect or disconnect the controllable dummy load circuit to the main output in response to the control signal.

5. The flyback switching power supply cross-regulation control circuit according to claim 4, characterized in that: The main path status detection module includes a first sampling resistor and a first signal conditioning and comparison circuit, wherein: The first sampling resistor is set in the main output circuit to sense the current of the main output and generate a corresponding first sampling voltage; The first signal conditioning and comparison circuit is connected to the first sampling resistor and is used to amplify and condition the first sampling voltage, and compare the conditioned signal with the first reference voltage to output a logic signal characterizing the first load state.

6. The flyback switching power supply cross-regulation control circuit according to claim 4, characterized in that: The auxiliary path status detection module includes a second sampling resistor and a second signal conditioning and comparison circuit, wherein: The second sampling resistor is set in the circuit of the auxiliary output to sense the current of the auxiliary output and generate a corresponding second sampling voltage; The second signal conditioning and comparison circuit is connected to the second sampling resistor and is used to amplify and condition the second sampling voltage, and compare the conditioned signal with the second reference voltage to output a logic signal characterizing the second load state.

7. The flyback switching power supply cross-regulation control circuit according to claim 4, characterized in that: The dummy load execution module includes a power resistor and a control switch, wherein: The power resistor and the control switch are connected in series to form a branch, and the branch is connected in parallel with the output terminal of the main circuit. The control terminal of the control switch is connected to the logic control module and is used to receive control signals sent by the logic control module to turn the branch on or off. When the first load state indicates that the main output is in a light load or no load state, and the second load state indicates that the auxiliary output is in a heavy load state, the logic control module generates the control signal for turning on the control switch; The dummy load execution module responds to the control signal by turning on the control switch and connecting the power resistor as a dummy load to the main output.

8. A flyback switching power supply, characterized in that, It includes a flyback switching power supply cross-regulation control circuit as described in any one of claims 4-7.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the computer program is loaded into the processor, it implements a flyback switching power supply cross-regulation control method according to any one of claims 1-3.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements a flyback switching power supply cross-regulation control method according to any one of claims 1-3.

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