An SPS system with improved cross regulation rate

Abstract

The present application discloses an SPS system for improving cross regulation rate, which relates to the field of power electronics technology. The system includes a transformer, a sampling module, a control module, a voltage clamping module, and a switch tube Q1 connected to the primary winding of the transformer; the feedback winding output end and the non-feedback winding output end of the transformer are both connected to a load; the sampling module is used to sample the output voltage of the feedback winding and output the output voltage of the feedback winding to the control module; the control module is used to adjust the on-off of the switch tube Q1 based on the output voltage of the feedback winding, so that the output voltage of the feedback winding is stabilized at the rated output voltage value V of the feedback winding. rated1 The voltage clamp module is used to clamp the output voltage of the non-feedback winding to the rated output voltage value V of the non-feedback winding based on the output voltage of the feedback winding. rated2 The technical solution of the present application can still ensure stable output of each channel when the load of a certain channel fluctuates, thus meeting the normal working requirements of the load.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to an SPS system with improved cross regulation rate. Background Art

[0002] SPS (Switch power supply) is a power supply that uses modern power electronics technology to control the on-time ratio of the switch tube to maintain a stable output voltage. The switching power supply has the advantages of small size, light weight, high efficiency and high voltage regulation accuracy. It is currently widely used in various products in the power industry to provide stable voltage.

[0003] Among them, the cross regulation rate refers to the degree of influence of the load current of one or more output circuits on the output voltages of other circuits in a multi-output flyback switching power supply, due to the influence of factors such as the leakage inductance between the transformer windings, the resistance of the windings, and the parasitic parameters of the current loop. Specifically, when the load of a certain output circuit changes, the percentage of the change in the voltage of other output circuits caused by this change to the rated voltage of the circuit, and the greater the load change of a certain output circuit, the greater the fluctuation of the output voltage of other circuits, which cannot meet the actual load demand and even affect the normal operation of the back-end load.

[0004] Therefore, it is urgent to design a method to solve the problem that the output voltage of the SPS system fluctuates due to the cross regulation rate, and even causes the back-end load to fail to work normally. Summary of the invention

[0005] In order to solve the problem that the output voltage of the SPS system fluctuates due to the cross regulation rate, and even causes the back-end load to not work normally, the present application provides an SPS system with improved cross regulation rate.

[0006] In a first aspect, the present application provides an SPS system for improving the cross adjustment rate, using the following technical solution:

[0007] An SPS system for improving cross regulation rate includes a transformer, a sampling module, a control module, a voltage clamping module, and a switch tube Q1 connected to the primary winding of the transformer; the feedback winding output end and the non-feedback winding output end of the transformer are respectively connected to a load;

[0008] The voltage clamping module is connected between the feedback winding and the non-feedback winding; the sampling module is connected to the feedback winding and the control module respectively; the control module is connected to the control end of the switch tube Q1;

[0009] The sampling module is used to sample the output voltage of the feedback winding and output the output voltage of the feedback winding to the control module;

[0010] The control module is used to adjust the on-off of the switch tube Q1 based on the output voltage of the feedback winding, so that the output voltage of the feedback winding is stabilized at the rated output voltage value V rated1 ;

[0011] The voltage clamping module is used to clamp the output voltage of the non-feedback winding to the rated output voltage value V of the non-feedback winding based on the output voltage of the feedback winding. rated2 .

[0012] By adopting the above technical solution, in a multi-channel output SPS system, on the one hand, the sampling module collects the output voltage of the feedback winding in real time and sends it to the control module, and the control module adjusts the on-off of the switch connected to the primary winding to ensure that the output voltage of the feedback winding is stable at the corresponding rated output voltage value V rated1 At the same time, real-time feedback adjustment can also ensure the stability of the feedback winding output voltage; on the other hand, when the feedback winding output voltage is stable, the voltage clamping module connected between the feedback winding and the non-feedback winding makes the output voltage of the non-feedback winding also clamped at the corresponding rated output voltage value V rated2 , while ensuring the stability of the output voltage of the feedback winding and the non-feedback winding, and effectively solving the problem of SPS system output voltage fluctuations caused by the cross-regulation rate, and even causing the back-end load to fail to work normally. When a certain load fluctuates, it can still ensure the stable output of each channel to meet the normal working requirements of the load, and the cost is low, which is suitable for occasions with requirements on system cost.

[0013] In a specific implementation scheme, the voltage clamp module includes a first diode, a second diode, a first voltage regulator tube, a second voltage regulator tube, a first switch and a second switch;

[0014] The anode of the first diode is connected to the output end of the non-feedback winding, the cathode of the first diode is connected to the cathode of the first voltage regulator and the first end of the first switch respectively; the anode of the first voltage regulator is connected to the second end of the first switch and the output end of the feedback winding respectively;

[0015] The cathode of the second diode is connected to the output end of the non-feedback winding, the anode of the second diode is respectively connected to the anode of the second voltage regulator tube and the first end of the second switch; the cathode of the second voltage regulator tube is respectively connected to the second end of the second switch and the output end of the feedback winding.

[0016] By adopting the above technical solution and the design of the voltage clamp module, the SPS system can be used to feedback the rated output voltage value V of the winding. rated1 And the non-feedback winding rated output voltage V rated2 In the case of consistent, it can also be used for the rated output voltage value V of the feedback winding rated1 And the non-feedback winding rated output voltage V rated2 No inconsistent situations, wide applicability, and will not add extra cost to the volume.

[0017] In a specific implementation scheme, the first switch and the second switch are configured as follows: the rated output voltage value V rated1 and the non-feedback winding rated output voltage V rated2 When they are both closed, the rated output voltage value of the feedback winding is V rated1 and the non-feedback winding rated output voltage V rated2 If there is any inconsistency, both are disconnected.

[0018] In a specific implementation scheme, when the first switch and the second switch are both closed, the first diode and the first switch form a first clamping loop, and the second diode and the second switch form a second clamping loop;

[0019] When the non-feedback winding output voltage exceeds the non-feedback winding rated output voltage V rated2 , then the output voltage of the non-feedback winding is clamped to the rated output voltage value V of the non-feedback winding through the first clamping circuit. rated2 ;

[0020] When the non-feedback winding output voltage is lower than the non-feedback winding rated output voltage V rated2 , then the output voltage of the non-feedback winding is clamped to the rated output voltage value V of the non-feedback winding through the second clamping circuit. rated2 .

[0021] By adopting the above technical solution, at the rated output voltage value V rated1 And the rated output voltage of non-feedback winding is V rated2When the load corresponding to the feedback winding increases or the load corresponding to the non-feedback winding decreases, the output voltage of the non-feedback winding increases; or the load corresponding to the feedback winding decreases or the load corresponding to the non-feedback winding increases, resulting in a decrease in the output voltage of the non-feedback winding, that is, when the output voltage of the non-feedback winding fluctuates, the voltage clamping module can be used to alternately conduct the two diodes to stabilize the output voltage of the non-feedback winding to the rated output voltage value V rated2 .

[0022] In a specific implementation scheme, when the first switch and the second switch are both turned off, the first diode and the first voltage regulator tube form a third clamping loop, and the second diode and the second voltage regulator tube form a fourth clamping loop;

[0023] When the non-feedback winding output voltage exceeds the non-feedback winding rated output voltage V rated2 , then the output voltage of the non-feedback winding is clamped to the rated output voltage value V of the non-feedback winding through the third clamping circuit. rated2 ;

[0024] When the non-feedback winding output voltage is lower than the non-feedback winding rated output voltage V rated2 , then the output voltage of the non-feedback winding is clamped to the rated output voltage value V of the non-feedback winding through the fourth clamping circuit. rated2 .

[0025] By adopting the above technical solution, at the rated output voltage value V rated1 And the rated output voltage of non-feedback winding is V rated2 When the output voltage of the non-feedback winding is inconsistent with the rated output voltage value V rated2 When the voltage increases or decreases, the output voltage of the non-feedback winding is stabilized to the rated output voltage value V of the non-feedback winding through the voltage stabilization effect of the corresponding diode and the voltage regulator. rated2 .

[0026] In a specific implementation manner, the sampling module includes a plurality of sampling resistors connected in series between the output end of the feedback winding and the ground end of the feedback winding.

[0027] In a specific implementation scheme, the control module includes a voltage comparison submodule and a PWM control submodule;

[0028] The voltage comparison submodule is used to compare the output voltage of the feedback winding with a preset reference voltage V ref and output the comparison result to the PWM control submodule;

[0029] The PWM control submodule is used to generate a corresponding PWM control signal based on the comparison result to adjust the on and off of the switch tube Q1.

[0030] In a specific possible implementation manner, the feedback winding and the non-feedback winding are connected to a common ground.

[0031] In a specific possible implementation scheme, the SPS system includes multiple non-feedback windings;

[0032] Among them, the multiple non-feedback windings include a rated output voltage value and the rated output voltage value V of the feedback winding. rated1 consistent non-feedback winding, and / or including a rated output voltage value with the rated output voltage value V of the feedback winding rated1 Inconsistent non-feedback windings; each non-feedback winding is connected to the feedback winding via a voltage clamping module.

[0033] In a specific implementation scheme, in the multi-channel non-feedback windings, for the rated output voltage value and the rated output voltage value V of the feedback winding, rated1 A consistent non-feedback winding, a first switch and a second switch in a voltage clamping module connected between the non-feedback winding and the feedback winding are in a closed state;

[0034] For the multiple non-feedback windings, the rated output voltage value is equal to the rated output voltage value V of the feedback winding. rated1 In the case of an inconsistent non-feedback winding, a first switch and a second switch in a voltage clamping module connected between the non-feedback winding and the feedback winding are in an open state.

[0035] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0036] 1. In a multi-channel output SPS system, on the one hand, the sampling module 1 collects the output voltage of the feedback winding in real time and sends it to the control module 2, which adjusts the on-off of the switch connected to the primary winding to ensure that the output voltage of the feedback winding is stable at the corresponding rated output voltage value V rated1 At the same time, real-time feedback adjustment can also ensure the stability of the feedback winding output voltage; on the other hand, when the feedback winding output voltage is stable, the output voltage of the non-feedback winding is also clamped at the corresponding rated output voltage value V by connecting the voltage clamping module 3 between the feedback winding and the non-feedback winding. rated2, while ensuring the stability of the output voltage of the feedback winding and the non-feedback winding, and effectively solving the problem of SPS system output voltage fluctuations caused by the cross-regulation rate, and even causing the back-end load to fail to work normally. When a certain load fluctuates, it can still ensure the stable output of each channel to meet the normal working requirements of the load, and the cost is low, which is suitable for occasions with requirements on system cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the overall structure of the SPS system for improving the cross adjustment rate in the embodiment of the present application;

[0038] Figure 2 It is the specific structure of the voltage clamping module 3 in the embodiment of the present application;

[0039] Figure 3 It is a schematic diagram of the connection structure when the SPS system includes multiple non-feedback windings in an embodiment of the present application.

[0040] Description of reference numerals:

[0041] 1. Sampling module; 2. Control module; 21. Voltage comparison submodule; 22. PWM control submodule; 3. Voltage clamping module. DETAILED DESCRIPTION

[0042] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to be used as limitations to the present application. As used in the specification of the present application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include plural expressions, unless there is a clear indication to the contrary in the context. It should also be understood that the term "and / or" used in the present application refers to any or all possible combinations comprising one or more of the listed items.

[0043] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as suggesting or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0044] The present application embodiment provides an SPS system for improving the cross-regulation rate, such as Figure 1 As shown, the system includes a transformer, a sampling module 1, a control module 2, a voltage clamping module 3, and a switch tube Q1 connected to the primary winding of the transformer; the feedback winding output end and the non-feedback winding output end of the transformer are both connected to a load;

[0045] The voltage clamping module 3 is connected between the feedback winding and the non-feedback winding; the sampling module 1 is connected to the feedback winding and the control module 2 respectively; the control module 2 is connected to the control end of the switch tube Q1;

[0046] The sampling module 1 is used to sample the output voltage of the feedback winding and output the output voltage of the feedback winding to the control module 2;

[0047] The control module 2 is used to adjust the on-off of the switch tube Q1 based on the output voltage of the feedback winding, so that the output voltage of the feedback winding is stabilized at the rated output voltage value V rated1 ;

[0048] The voltage clamping module 3 is used to clamp the output voltage of the non-feedback winding to the rated output voltage value V of the non-feedback winding based on the output voltage of the feedback winding. rated2 .

[0049] It can be understood that the primary winding is located at the primary side of the transformer, and the feedback winding and the non-feedback winding are both located at the secondary side of the transformer.

[0050] Further, refer to Figure 1 The output end of the feedback winding is also connected to a diode Da for rectification and a capacitor Ca for filtering; similarly, the output end of the non-feedback winding is also connected to a diode Db for rectification and a capacitor Cb for filtering. A resistor Rg is connected between the control end of the switch tube Q1 and the control module 2, and the end of the switch tube Q1 that is not connected to the primary winding is grounded.

[0051] The technical solution of the present application, in a multi-output SPS system, on the one hand, collects the output voltage of the feedback winding in real time through the sampling module 1 to the control module 2, and the control module 2 adjusts the on-off of the switch tube connected to the primary winding to ensure that the output voltage of the feedback winding is stable at the corresponding rated output voltage value V rated1 At the same time, real-time feedback adjustment can also ensure the stability of the feedback winding output voltage; on the other hand, when the feedback winding output voltage is stable, the output voltage of the non-feedback winding is also clamped at the corresponding rated output voltage value V by connecting the voltage clamping module 3 between the feedback winding and the non-feedback winding. rated2 , while ensuring the stability of the output voltage of the feedback winding and the non-feedback winding, and effectively solving the problem of SPS system output voltage fluctuations caused by the cross-regulation rate, and even causing the back-end load to fail to work normally. When a certain load fluctuates, it can still ensure the stable output of each channel to meet the normal working requirements of the load, and the cost is low, which is suitable for occasions with requirements on system cost.

[0052] In a possible implementation, Figure 2 As shown, the voltage clamping module 3 includes a first diode D1, a second diode D2, a first voltage regulator tube ZD1, a second voltage regulator tube ZD2, a first switch S1 and a second switch S2;

[0053] The anode of the first diode D1 is connected to the output end of the non-feedback winding, and the cathode of the first diode D1 is connected to the cathode of the first voltage regulator tube ZD1 and the first end of the first switch S1 respectively; the anode of the first voltage regulator tube ZD1 is connected to the second end of the first switch S1 and the output end of the feedback winding respectively;

[0054] The cathode of the second diode D2 is connected to the output end of the non-feedback winding, and the anode of the second diode D2 is respectively connected to the anode of the second voltage regulator tube ZD2 and the first end of the second switch S2; the cathode of the second voltage regulator tube ZD2 is respectively connected to the second end of the second switch S2 and the output end of the feedback winding.

[0055] In a possible implementation manner, the first switch S1 and the second switch S2 are configured as follows: the rated output voltage value V rated1 and the non-feedback winding rated output voltage V rated2 When they are both closed, the rated output voltage value of the feedback winding is V rated1 and the non-feedback winding rated output voltage V rated2 If they are inconsistent, they will be disconnected.

[0056] It should be noted that the control of the first switch S1 and the second switch S2 can be controlled by an MCU with a processing function. When the MCU obtains the rated output voltage value V rated1 And the rated output voltage of non-feedback winding is V rated2 When the MCU obtains the rated output voltage value V of the feedback winding, the first switch S1 and the second switch S2 are controlled to close. rated1 And the rated output voltage of non-feedback winding is V rated2 When there is inconsistent information, the first switch S1 and the second switch S2 can be controlled to be disconnected; of course, the first switch S1 and the second switch S2 can also be manually controlled, and the staff can close or disconnect the two switches according to the actual situation; in addition, the enabling control method can also be used, and technical personnel in this field can flexibly design it, and this application does not make specific limitations on this.

[0057] Through the design of the voltage clamp module 3, the SPS system can be used to feedback the rated output voltage value V of the winding rated1 And the rated output voltage of non-feedback winding is V rated2 In the case of consistent, it can also be used for the rated output voltage value V of the feedback windingrated1 And the rated output voltage of non-feedback winding is V rated2 No inconsistent situations, wide applicability, and will not add extra cost to the volume.

[0058] In a possible implementation manner, when the first switch S1 and the second switch S2 are both closed, that is, at this time, the rated output voltage value V of the feedback winding rated1 And the rated output voltage of non-feedback winding is V rated2 The first diode D1 and the first switch S1 form a first clamping loop, and the second diode D2 and the second switch S2 form a second clamping loop;

[0059] When the non-feedback winding output voltage exceeds the non-feedback winding rated output voltage V rated2 , then the output voltage of the non-feedback winding is clamped to the rated output voltage value V of the non-feedback winding through the first clamping circuit. rated2 That is, at this time, the output voltage of the non-feedback winding is higher than the output voltage of the feedback winding. Then, by connecting the output terminal of the non-feedback winding with the output terminal of the feedback winding through the first clamping circuit, the output voltage of the non-feedback winding can be stabilized to a value consistent with the output voltage of the feedback winding, that is, the rated output voltage V rated2 .

[0060] When the non-feedback winding output voltage is lower than the non-feedback winding rated output voltage V rated2 , then the output voltage of the non-feedback winding is clamped to the rated output voltage value V of the non-feedback winding through the second clamping circuit. rated2 That is, at this time, the output voltage of the non-feedback winding is lower than the output voltage of the feedback winding. Then, by connecting the output end of the non-feedback winding with the output end of the feedback winding through the second clamping circuit, the output voltage of the non-feedback winding can be stabilized to a value consistent with the output voltage of the feedback winding, that is, the rated output voltage V rated2 .

[0061] The above technical solution, when the rated output voltage value of the feedback winding is V rated1 And the rated output voltage of non-feedback winding is V rated2When the load corresponding to the feedback winding increases or the load corresponding to the non-feedback winding decreases, the output voltage of the non-feedback winding increases; or the load corresponding to the feedback winding decreases or the load corresponding to the non-feedback winding increases, resulting in a decrease in the output voltage of the non-feedback winding, that is, when the output voltage of the non-feedback winding fluctuates, the voltage clamping module 3 can be used to alternately conduct the two diodes to stabilize the output voltage of the non-feedback winding to the rated output voltage value V rated2 .

[0062] In a possible implementation manner, when both the first switch S1 and the second switch S2 are disconnected; that is, at this time, the rated output voltage value V rated1 And the rated output voltage of non-feedback winding is V rated2 Inconsistent, the first diode D1 and the first voltage regulator ZD1 form a third clamping loop, and the second diode D2 and the second voltage regulator ZD2 form a fourth clamping loop;

[0063] When the non-feedback winding output voltage exceeds the non-feedback winding rated output voltage V rated2 , then the output voltage of the non-feedback winding is clamped to the rated output voltage value V of the non-feedback winding through the third clamping circuit. rated2 That is, at this time, the output voltage of the non-feedback winding is higher than the sum of the output voltage of the feedback winding and the stable voltage of the first voltage regulator. Then, by connecting the output end of the non-feedback winding with the output end of the feedback winding through the third clamping circuit, the output voltage of the non-feedback winding can be stabilized to its corresponding rated output voltage V rated2 .

[0064] When the non-feedback winding output voltage is lower than the non-feedback winding rated output voltage V rated2 , then the output voltage of the non-feedback winding is clamped to the rated output voltage value V of the non-feedback winding through the fourth clamping circuit. rated2 That is, at this time, the output voltage of the non-feedback winding is lower than the sum of the output voltage of the feedback winding and the stable voltage of the first voltage regulator. Then, by connecting the output end of the non-feedback winding with the output end of the feedback winding through the fourth clamping loop, the output voltage of the non-feedback winding can be stabilized to its corresponding rated output voltage V rated2 .

[0065] The above technical solution, when the rated output voltage value of the feedback winding is V rated1 And the rated output voltage of non-feedback winding is V rated2When the output voltage of the non-feedback winding is inconsistent with the rated output voltage value V rated2 When the voltage increases or decreases, the output voltage of the non-feedback winding is stabilized to the rated output voltage value V of the non-feedback winding through the voltage stabilization effect of the corresponding diode and the voltage regulator. rated2 .

[0066] It should be noted that the rated output voltage value V of the feedback winding can be referred to. rated1 and the rated output voltage of the non-feedback winding V rated2 The difference between them is used to select the first voltage regulator tube ZD1 and the second voltage regulator tube ZD2 with corresponding specifications. When the rated output voltage value of the feedback winding is V rated1 Lower than the rated output voltage of the non-feedback winding V rated2 , then when selecting the first voltage regulator tube ZD1, the rated output voltage of the non-feedback winding V rated2 Equal to the rated output voltage of the feedback winding V rated1 The principle of selecting the feedback winding is to sum the stable voltage of the first voltage regulator ZD1. rated1 Higher than the rated output voltage of the non-feedback winding V rated2 , then when selecting the second voltage regulator ZD2, the rated output voltage value V of the feedback winding can be used. rated1 Equal to the rated output voltage of the non-feedback winding V rated2 The principle of selecting is the sum of the stable voltage of the second voltage regulator ZD2.

[0067] In a possible implementation, Figure 2 As shown, the sampling module 1 includes a plurality of sampling resistors connected in series between the output end of the feedback winding and the ground end of the feedback winding. The figure shows a case where two sampling resistors, R1 and R2, are included, and the output end of the sampling module 1 is the middle node of the resistors R1 and R2. Those skilled in the art can flexibly adjust the number of sampling resistors.

[0068] In a possible implementation, Figure 2 As shown, the control module 2 includes a voltage comparison submodule 21 and a PWM control submodule 22;

[0069] The voltage comparison submodule 21 is used to compare the output voltage of the feedback winding with a preset reference voltage V ref and output the comparison result to the PWM control submodule 22;

[0070] The PWM control submodule 22 is used to generate a corresponding PWM control signal based on the comparison result to adjust the on / off of the switch tube Q1.

[0071] In a possible implementation manner, the feedback winding and the non-feedback winding are connected to a common ground.

[0072] In a possible implementation, the SPS system may include one non-feedback winding, or may include multiple non-feedback windings; Figure 3 As shown, the multi-channel non-feedback winding includes a rated output voltage value and the rated output voltage value V of the feedback winding. rated1 consistent non-feedback winding, and / or including a rated output voltage value with the rated output voltage value V of the feedback winding rated1 Inconsistent non-feedback windings; and each non-feedback winding is connected to the feedback winding through a voltage clamping module 3.

[0073] That is to say, in the same SPS system, one or more rated output voltage values ​​may be included that are equal to the rated output voltage value V of the feedback winding. rated1 The non-feedback winding may also include one or more paths with the same rated output voltage value as the feedback winding rated output voltage value V rated1 There are no specific limitations on the number and type of inconsistent non-feedback windings, or a combination of the two, and those skilled in the art can flexibly set them according to actual needs.

[0074] In addition, Figure 3 In the corresponding structure, in the multi-channel non-feedback winding, for the rated output voltage value and the rated output voltage value V of the feedback winding rated1 A consistent non-feedback winding, a first switch and a second switch in a voltage clamping module 3 connected between the non-feedback winding and the feedback winding are in a closed state;

[0075] For the multiple non-feedback windings, the rated output voltage value is equal to the rated output voltage value V of the feedback winding. rated1 In the case of an inconsistent non-feedback winding, a first switch and a second switch in a voltage clamping module 3 connected between the non-feedback winding and the feedback winding are in an open state.

[0076] When there are multiple non-feedback windings of different types in the SPS system, the rated output voltage value V of the non-feedback winding is determined according to actual needs. rated2 The rated output voltage of the feedback winding is V rated1 After determining whether they are consistent, the first switch and the first switch in the corresponding voltage clamping module 3 are opened or closed.

[0077] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An SPS system for improving cross regulation rate, characterized in that: It comprises a transformer, a sampling module (1), a control module (2), a voltage clamping module (3), and a switch tube Q1 connected to the primary winding of the transformer; the feedback winding output end and the non-feedback winding output end of the transformer are both connected to a load; The voltage clamping module (3) is connected between the feedback winding and the non-feedback winding; the sampling module (1) is connected to the feedback winding and the control module (2) respectively; the control module (2) is connected to the control end of the switch tube Q1; The sampling module (1) is used to sample the output voltage of the feedback winding and output the output voltage of the feedback winding to the control module (2); The control module (2) is used to adjust the on-off of the switch tube Q1 based on the output voltage of the feedback winding, so that the output voltage of the feedback winding is stabilized at the rated output voltage value V rated1 ; The voltage clamping module (3) is used to clamp the output voltage of the non-feedback winding to the rated output voltage value V of the non-feedback winding based on the output voltage of the feedback winding. rated2 ; The voltage clamping module (3) comprises a first diode, a second diode, a first voltage regulator tube, a second voltage regulator tube, a first switch and a second switch; The anode of the first diode is connected to the output end of the non-feedback winding, the cathode of the first diode is connected to the cathode of the first voltage regulator and the first end of the first switch respectively; the anode of the first voltage regulator is connected to the second end of the first switch and the output end of the feedback winding respectively; The cathode of the second diode is connected to the output end of the non-feedback winding, the anode of the second diode is respectively connected to the anode of the second voltage regulator tube and the first end of the second switch; the cathode of the second voltage regulator tube is respectively connected to the second end of the second switch and the output end of the feedback winding.

2. The SPS system for improving cross regulation rate according to claim 1, characterized in that: The first switch and the second switch are configured as follows: the rated output voltage value V rated1 and the non-feedback winding rated output voltage V rated2 When they are both closed, the rated output voltage value of the feedback winding is V rated1 and the non-feedback winding rated output voltage V rated2 If they are inconsistent, they will be disconnected.

3. The SPS system for improving cross regulation rate according to claim 2, characterized in that: When the first switch and the second switch are both closed, the first diode and the first switch form a first clamping loop, and the second diode and the second switch form a second clamping loop; When the non-feedback winding output voltage exceeds the non-feedback winding rated output voltage V rated2 , then the output voltage of the non-feedback winding is clamped to the rated output voltage value V of the non-feedback winding through the first clamping circuit. rated2 ; When the non-feedback winding output voltage is lower than the non-feedback winding rated output voltage V rated2 , then the output voltage of the non-feedback winding is clamped to the rated output voltage value V of the non-feedback winding through the second clamping circuit. rated2 .

4. The SPS system for improving cross regulation rate according to claim 3, characterized in that: When the first switch and the second switch are both disconnected, the first diode and the first voltage regulator tube form a third clamping loop, and the second diode and the second voltage regulator tube form a fourth clamping loop; When the non-feedback winding output voltage exceeds the non-feedback winding rated output voltage V rated2 , then the output voltage of the non-feedback winding is clamped to the rated output voltage value V of the non-feedback winding through the third clamping circuit. rated2 ; When the non-feedback winding output voltage is lower than the non-feedback winding rated output voltage V rated2 , then the output voltage of the non-feedback winding is clamped to the rated output voltage value V of the non-feedback winding through the fourth clamping circuit. rated2 .

5. The SPS system for improving cross regulation rate according to claim 1, characterized in that: The sampling module (1) comprises a plurality of sampling resistors connected in series between the output end of the feedback winding and the ground end of the feedback winding.

6. The SPS system for improving cross regulation rate according to claim 1, characterized in that: The control module (2) comprises a voltage comparison submodule (21) and a PWM control submodule (22); The voltage comparison submodule (21) is used to compare the output voltage of the feedback winding with a preset reference voltage V ref and outputting the comparison result to the PWM control submodule (22); The PWM control submodule (22) is used to generate a corresponding PWM control signal based on the comparison result to adjust the on / off of the switch tube Q1.

7. The SPS system for improving cross regulation rate according to claim 1, characterized in that: The feedback winding and the non-feedback winding are connected to a common ground.

8. The SPS system for improving cross regulation rate according to claim 1, characterized in that: Including multiple non-feedback windings; Among them, the multiple non-feedback windings include a rated output voltage value and the rated output voltage value V of the feedback winding. rated1 consistent non-feedback winding, and / or including a rated output voltage value with the rated output voltage value V of the feedback winding rated1 Inconsistent non-feedback windings; each non-feedback winding is connected to the feedback winding via a voltage clamping module (3).

9. The SPS system for improving cross regulation rate according to claim 8, characterized in that: In the multi-channel non-feedback winding, for the rated output voltage value and the rated output voltage value V of the feedback winding rated1 A consistent non-feedback winding, a first switch and a second switch in a voltage clamping module (3) connected between the non-feedback winding and the feedback winding are in a closed state; For the multiple non-feedback windings, the rated output voltage value is equal to the rated output voltage value V of the feedback winding. rated1 In an inconsistent non-feedback winding, a first switch and a second switch in a voltage clamping module (3) connected between the non-feedback winding and the feedback winding are in an open state.

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