Staggered active clamping forward circuit and power supply

Abstract

The invention discloses a staggered active clamping forward circuit and a power supply, and relates to the technical field of circuits. The circuit comprises a first voltage converter, a second voltage converter, a first rectifier tube, a second rectifier tube, a follow current tube, a follow current inductor and an output capacitor. The output capacitor is connected in parallel between the output voltage anode and the output voltage cathode. The first end of the secondary winding of the first voltage converter is connected with the first end of the follow current tube and is connected with the output voltage positive electrode through the follow current inductor. The second end of the secondary winding of the first voltage converter is connected in series with the first rectifier tube, then connected with the second end of the follow current tube and connected to the output voltage cathode, and the output voltage cathode is grounded. The first end of the secondary winding of the second voltage converter is connected with the first end of the follow current tube and is connected with the output voltage positive electrode through the follow current inductor. The second end of the secondary winding of the second voltage converter is connected in series with a second rectifier tube, then connected to the output voltage cathode and grounded.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and in particular to an interleaved active embedded forward circuit and a power supply. Background Art

[0002] With the development of electronic technology, the volume design of high power density power products is getting smaller and smaller. For example, the volume design of DC-DC converters in power supplies also needs to be smaller and smaller. In the existing DC-DC converters, the active clamp forward circuit topology adopts the conventional interleaved active clamp forward circuit, and each transformer needs to be equipped with separate freewheeling tubes and freewheeling inductors and other components. As a result, in the existing DC-DC converters, the components occupy a large space, resulting in a large volume of the entire product and a high cost. Summary of the invention

[0003] The present application provides an interleaved active embedded forward circuit and power supply. By improving the topological structure of the circuit, the secondary winding of the first voltage converter and the secondary winding of the second voltage converter can share the same freewheeling tube and freewheeling inductor, thereby reducing the setting of components, so that the volume of the device having the circuit can be set smaller and the overall cost is reduced.

[0004] In a first aspect, the present application provides an interleaved active clamping forward circuit, the circuit comprising a first voltage converter, a second voltage converter, a first rectifier, a second rectifier, a freewheeling tube, a freewheeling inductor and an output capacitor. The output capacitor is connected in parallel between the positive electrode of the output voltage and the negative electrode of the output voltage.

[0005] The first end of the secondary winding of the first voltage converter is connected to the first end of the freewheeling tube, and is connected to the positive electrode of the output voltage through the freewheeling inductor. The second end of the secondary winding of the first voltage converter is connected in series with the first rectifier tube and then connected to the second end of the freewheeling tube, and is connected to the negative electrode of the output voltage.

[0006] The first end of the secondary winding of the second voltage converter is connected to the first end of the freewheeling tube and connected to the positive electrode of the output voltage through the freewheeling inductor. The second end of the secondary winding of the second voltage converter is connected in series with the second rectifier tube and then connected to the negative electrode of the output voltage and grounded.

[0007] In a possible design manner of the first aspect, the circuit further includes:

[0008] The first end of the primary winding of the first voltage converter is connected to the positive electrode of the power supply, and the second end of the primary winding of the first voltage converter is connected to the negative electrode of the power supply through the first switch tube. The second end of the primary winding of the first voltage converter is also connected to the negative electrode of the power supply through the first clamping circuit, and the first clamping circuit is connected in parallel with the first switch tube.

[0009] The first end of the primary winding of the second voltage converter is connected to the positive electrode of the power supply, and the second end of the primary winding of the second voltage converter is connected to the negative electrode of the power supply through the second switch tube. The second end of the primary winding of the second voltage converter is also connected to the negative electrode of the power supply through the second clamping circuit, and the second clamping circuit is connected in parallel with the second switch tube.

[0010] In a possible design manner of the first aspect, the circuit further includes:

[0011] The first clamping circuit includes a first resonant tube and a first capacitor. The first capacitor is connected in series with the first resonant tube. The first capacitor is connected to the second end of the primary winding of the first voltage converter. The first resonant tube is connected to the negative electrode of the power supply.

[0012] The second clamping circuit includes a second resonant tube and a second capacitor. The second capacitor and the second resonant tube are connected in series. The second capacitor is connected to the second end of the primary winding of the second voltage converter. The second resonant tube is connected to the negative electrode of the power supply.

[0013] In a possible design manner of the first aspect, the circuit further includes:

[0014] The first end of the primary winding of the first voltage converter is connected to the positive electrode of the power supply through the first current transformer. The first end of the primary winding of the second voltage converter is connected to the positive electrode of the power supply through the second current transformer.

[0015] In a possible design of the first aspect, the circuit also includes a controller, wherein a first output end of the controller is connected to a control end of the first rectifier tube, a second output end of the controller is connected to a control end of the second rectifier tube, and a third output end of the controller is connected to a control end of the freewheeling tube.

[0016] The fourth output terminal of the controller is connected to the control terminal of the first switch tube, the fifth output terminal of the controller is connected to the control terminal of the first resonance tube, the sixth output terminal of the controller is connected to the control terminal of the second switch tube, and the seventh output terminal of the controller is connected to the control terminal of the second resonance tube.

[0017] In a possible design manner of the first aspect, the first switch tube and the second switch tube are both N-type MOS tubes, and the first resonance tube and the second resonance tube are both P-type MOS tubes.

[0018] In a possible design of the first aspect, the first rectifier tube, the second rectifier tube and the freewheeling tube are all N-type MOS tubes, or are all diodes.

[0019] In a possible design manner of the first aspect, parameters of the first rectifier tube and the second rectifier tube are the same.

[0020] In a second aspect, the present application provides a power supply, including the interleaved active clamped forward circuit of the first aspect and any possible design thereof.

[0021] It can be understood that the beneficial effects that can be achieved by the power supply described in the second aspect provided above can refer to the beneficial effects in the first aspect and any possible design thereof, and will not be repeated here.

[0022] Beneficial effects of this application:

[0023] By improving the topological structure of the circuit, the secondary winding of the first voltage converter and the secondary winding of the second voltage converter can share the same freewheeling tube and freewheeling inductor. Compared with the situation where each secondary winding of the voltage converter needs to be provided with a separate freewheeling tube and freewheeling inductor, at least one freewheeling tube and freewheeling inductor is reduced, and the overall setting of components is reduced, so that the volume of the device having the circuit can be set smaller and the overall cost is reduced. Due to the reduction in the setting of components, the power consumption of the entire circuit is reduced, and its conversion efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of the structure of an interleaved active clamped forward circuit provided in an embodiment of the present application;

[0026] Figure 2 A circuit schematic diagram of an interleaved active clamped forward circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0028] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0029] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating 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.

[0030] It should be understood that the terms used in the description of the various examples herein are only for describing specific examples and are not intended to be limiting. As used in the description of the various examples, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0031] In this application, "at least one" means one, two or more, and "more" means more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0032] It should also be understood that in the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a sliding connection, a detachable connection, or an integral connection, etc.; it can be a direct connection or an indirect connection through an intermediate medium.

[0033] It should also be understood that the term “comprise” (also known as “includes,” “including,” “comprises” and / or “comprising”) when used in this specification specifies the presence of stated features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0034] It should be understood that the "one embodiment", "another embodiment", "a possible design" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment or implementation are included in at least one embodiment of the present application. Therefore, "in one embodiment of the present application" or "in another embodiment of the present application", "a possible design" appearing in various places throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0035] It should also be understood that the specific values ​​mentioned in the embodiments of the present application do not limit the specific dimensions of specific features or structures. The relevant values ​​may be examples for easy understanding, or they may be the theoretically optimal theoretical values ​​of a certain feature. In practice, the relevant dimensions may be a range of the value appended thereto, for example, the range may be ±10% of the optimal theoretical value, or ±20% of the optimal theoretical value, and in practice, the corresponding technical effect can be achieved.

[0036] In the existing DC-DC converters, the active clamp forward circuit topology uses a conventional interleaved active clamp forward circuit, and each transformer needs to be equipped with a separate freewheeling tube and freewheeling inductor and other components. As a result, the components in the existing DC-DC converters occupy a large space and are also costly. In addition, most of the existing DC-DC converters use analog IC control PWM solutions, which makes device procurement and circuit debugging difficult.

[0037] In order to solve the above technical problems, an embodiment of the present application provides an interleaved active embedded forward circuit to solve the problem that each transformer in the DC-DC converter needs to be provided with a separate freewheeling tube, freewheeling inductor and other components. The DC-DC converter circuit topology can be optimized, and the setting of similar components can be reduced, so that the volume of the DC-DC converter can be set smaller.

[0038] refer to Figure 1 , Figure 1 The structure diagram of a staggered active clamping forward circuit provided in the embodiment of the present application is shown in FIG. Figure 1 As shown, an interleaved active clamping forward circuit provided in an embodiment of the present application includes a first voltage converter T1, a second voltage converter T2, a first rectifier, a second rectifier, a freewheeling tube, a freewheeling inductor and an output capacitor. The output capacitor is connected in parallel between the positive electrode of the output voltage and the negative electrode of the output voltage.

[0039] The first end of the secondary winding of the first voltage converter T1 is connected to the first end of the freewheeling tube, and is connected to the positive electrode of the output voltage through the freewheeling inductor. The second end of the secondary winding of the first voltage converter T1 is connected in series with the first rectifier tube and then connected to the second end of the freewheeling tube, and is connected to the negative electrode of the output voltage, and the negative electrode of the output voltage is grounded. That is, the second end of the freewheeling tube is grounded, and the end of the first rectifier tube connected to the freewheeling tube is also grounded.

[0040] The first end of the secondary winding of the second voltage converter T2 is connected to the first end of the freewheeling tube and connected to the positive electrode of the output voltage through the freewheeling inductor. The second end of the secondary winding of the second voltage converter T2 is connected in series with the second rectifier tube, connected to the negative electrode of the output voltage and grounded.

[0041] In the embodiment of the present application, by improving the DC-DC converter circuit topology, the secondary winding of the first voltage converter T1 and the secondary winding of the second voltage converter T2 can share the same freewheeling tube and freewheeling inductor. Compared with the situation where each voltage converter secondary winding needs to be provided with a separate freewheeling tube and freewheeling inductor, at least one freewheeling tube and freewheeling inductor are reduced, and the overall setting of components is reduced, so that the volume of the DC-DC converter can be set smaller and the overall cost is reduced. Since the overall setting of components is reduced, the power consumption of the entire DC-DC converter is reduced, and its conversion efficiency is improved.

[0042] In one embodiment of the present application, the first rectifier, the second rectifier and the freewheeling tube are all MOS tubes, wherein the first rectifier, the second rectifier and the freewheeling tube can all adopt N-type MOS tubes, or the first rectifier, the second rectifier and the freewheeling tube can also adopt diodes, and the parameters of the first rectifier and the second rectifier can be set to be the same. For the convenience of description, the first rectifier is a MOS tube Q1, the second rectifier is a MOS tube Q2, and the freewheeling tube is a MOS tube Q3.

[0043] refer to Figure 2 , Figure 2 The schematic diagram of a staggered active clamping forward circuit provided in the embodiment of the present application is shown in FIG. Figure 2 As shown, the first end of the secondary winding of the first voltage converter T1 is connected to the drain of the MOS tube Q3, and the first end of the secondary winding of the first voltage converter T1 is connected to the first end of the freewheeling inductor, and the second end of the freewheeling inductor is connected to the positive electrode of the output voltage.

[0044] The second end of the secondary winding of the first voltage converter T1 is connected to the drain of the MOS transistor Q1, the source of the MOS transistor Q1 is connected to the source of the MOS transistor Q3, and the source of the MOS transistor Q1 and the source of the MOS transistor Q3 are both connected to the negative electrode of the output voltage, and the negative electrode of the output voltage is grounded.

[0045] The first end of the secondary winding of the second voltage converter T2 is connected to the drain of the MOS tube Q3, and the first end of the secondary winding of the second voltage converter T2 is also connected to the first end of the freewheeling inductor, and the second end of the freewheeling inductor is connected to the positive electrode of the output voltage.

[0046] The second end of the secondary winding of the second voltage converter T2 is connected to the drain of the MOS transistor Q2 , and the source of the MOS transistor Q2 is connected to the negative electrode of the output voltage and is grounded.

[0047] The first end of the output capacitor is connected between the positive electrode of the output voltage and the second end of the freewheeling inductor, and the second end of the output capacitor is connected to the negative electrode of the output voltage. The output capacitor, the freewheeling inductor and the freewheeling tube can form a loop.

[0048] It can be known from the above settings that the first end of the secondary winding of the first voltage converter T1 and the first end of the secondary winding of the second voltage converter T2 are both connected to the drain of the MOS tube Q3, and are both connected to the first end of the freewheeling inductor, and are connected to the positive electrode of the output voltage through the freewheeling inductor. The second end of the secondary winding of the first voltage converter T1 and the second end of the secondary winding of the second voltage converter T2 are both connected to the negative electrode of the output voltage through a rectifier tube. That is, the first voltage converter T1 and the second voltage converter T2 share the same freewheeling tube and freewheeling inductor.

[0049] In one embodiment of the present application, the first end of the primary winding of the first voltage converter T1 is connected to the positive electrode of the power supply, and the second end of the primary winding of the first voltage converter T1 is connected to the negative electrode of the power supply through the first switch tube and is grounded. The second end of the primary winding of the first voltage converter T1 is also connected to the negative electrode of the power supply through the first clamping circuit 10, and the first clamping circuit 10 is connected in parallel with the first switch tube.

[0050] The first end of the primary winding of the second voltage converter T2 is connected to the positive electrode of the power supply, and the second end of the primary winding of the second voltage converter T2 is connected to the negative electrode of the power supply through the second switch tube and grounded. The second end of the primary winding of the second voltage converter T2 is also connected to the negative electrode of the power supply and grounded through the second clamping circuit 20, and the second clamping circuit 20 is connected in parallel with the second switch tube.

[0051] Through the above configuration, active clamping circuits are provided at the primary winding ends of the first voltage converter T1 and the second voltage converter T2, wherein the first switch is the main switch of the first voltage converter T1 and the second switch is the main switch of the second voltage converter T2.

[0052] In one embodiment of the present application, the first clamping circuit 10 includes a first resonant tube and a first capacitor, the first capacitor is connected in series with the first resonant tube, the first capacitor is connected to the second end of the primary winding of the first voltage converter T1, and the first resonant tube is connected to the negative electrode of the power supply and grounded. The second clamping circuit 20 includes a second resonant tube and a second capacitor, the second capacitor is connected in series with the second resonant tube, the second capacitor is connected to the second end of the primary winding of the second voltage converter T2, and the second resonant tube is connected to the negative electrode of the power supply.

[0053] In an embodiment of the present application, the first switch tube, the first resonance tube, the second switch tube and the second resonance tube are all MOS tubes, wherein the first switch tube and the second switch tube can be N-type MOS tubes, and the first resonance tube and the second resonance tube can be P-type MOS tubes. For the convenience of description, the first switch tube is MOS tube Q4, the first resonance tube is MOS tube Q5, the second switch tube is MOS tube Q6, and the second resonance tube is MOS tube Q7.

[0054] like Figure 2As shown, the drain of the MOS tube Q4 is connected to the second end of the primary winding of the first voltage converter T1, and the source of the MOS tube Q4 is connected to the negative electrode of the power supply and grounded. The first end of the first capacitor is connected to the second end of the primary winding of the first voltage converter T1, the second end of the first capacitor is connected to the drain of the MOS tube Q5, and the source of the MOS tube Q5 is connected to the negative electrode of the power supply and grounded. The first capacitor is connected in series with the MOS tube Q5, and the whole of the first capacitor and the MOS tube Q5 connected in series is connected in parallel with the first switch tube.

[0055] The drain of the MOS tube Q6 is connected to the second end of the primary winding of the second voltage converter T2, and the source of the MOS tube Q6 is connected to the negative electrode of the power supply and grounded. The first end of the second capacitor is connected to the second end of the primary winding of the second voltage converter T2, the second end of the second capacitor is connected to the drain of the MOS tube Q7, and the source of the MOS tube Q7 is connected to the negative electrode of the power supply and grounded. The second capacitor is connected in series with the MOS tube Q7, and the whole of the second capacitor and the MOS tube Q7 connected in series is connected in parallel with the second switch tube.

[0056] In one embodiment of the present application, the first end of the primary winding of the first voltage converter T1 is connected to the positive pole of the power supply through the first current transformer, and the first end of the primary winding of the second voltage converter T2 is connected to the positive pole of the power supply through the second current transformer.

[0057] The first current transformer and the second current transformer are used to sample the current signal of the switch tube on the primary winding to adjust the duty cycle.

[0058] In one embodiment of the present application, the circuit also includes a controller (DSP), which includes multiple output terminals for connecting to different components. The controller can receive the signals sampled by the first current transformer and the second current transformer, and output corresponding control signals to control the working state of each component. Among them, the first output terminal of the controller is connected to the control terminal of the first rectifier tube, the second output terminal of the controller is connected to the control terminal of the second rectifier tube, and the third output terminal of the controller is connected to the control terminal of the freewheeling tube. The fourth output terminal of the controller is connected to the control terminal of the first switch tube, and the fifth output terminal of the controller is connected to the control terminal of the first resonance tube. The sixth output terminal of the controller is connected to the control terminal of the second switch tube, and the seventh output terminal of the controller is connected to the control terminal of the second resonance tube.

[0059] Specifically, Figure 2As shown, the first output terminal (S1) of the controller (DSP) is connected to the gate of the MOS transistor Q1, and is used to output a control signal to control the working state of the MOS transistor Q1. The second output terminal (S2) of the controller is connected to the gate of the MOS transistor Q2, and is used to output a control signal to control the working state of the MOS transistor Q2. The third output terminal (S3) of the controller is connected to the gate of the MOS transistor Q3, and is used to output a control signal to control the working state of the MOS transistor Q3. The fourth output terminal (S4) of the controller is connected to the gate of the MOS transistor Q4, and is used to output a control signal to control the working state of the MOS transistor Q4. The fifth output terminal (S5) of the controller is connected to the gate of the MOS transistor Q5, and is used to output a control signal to control the working state of the MOS transistor Q5. The sixth output terminal (S6) of the controller is connected to the gate of the MOS transistor Q6, and is used to output a control signal to control the working state of the MOS transistor Q6. The seventh output terminal (S7) of the controller is connected to the gate of the MOS transistor Q7, and is used to output a control signal to control the working state of the MOS transistor Q7.

[0060] In the embodiment of the present application, two working circuits are included, one of which is mainly composed of a first current transformer TR1, a first switch tube Q4, a first resonance tube Q5, a first capacitor C1, a first voltage converter T1T1, a first rectifier tube Q1, a freewheeling tube Q3, and a freewheeling inductor L. The other working circuit is mainly composed of a second current transformer TR2, a second switch tube Q6, a second resonance tube Q7, a second capacitor C2, a second voltage converter T2T2, a second rectifier tube Q2, a freewheeling tube Q3, and a freewheeling inductor L.

[0061] The first current transformer TR1 and the second current transformer TR2 respectively send the current sampling signal to the controller DSP for processing. In one clock cycle, one working circuit works in the upper half cycle, and the other working circuit works in the lower half cycle. The conduction duty cycle of the first switch tube Q4 and the second switch tube Q6 is less than or equal to 50%; when the controller DSP controls the first rectifier tube Q1 to be turned on, the second rectifier tube Q2 is controlled to be turned off, and when the controller DSP controls the second rectifier tube Q2 to be turned on, the first rectifier tube Q1 is controlled to be turned off, thereby ensuring that the first rectifier tube Q1 and the second rectifier tube Q2 are not turned on at the same time; the freewheeling tube Q3 and the freewheeling inductor L are common devices for the two working circuits.

[0062] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

[0063] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0064] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the protection scope of the present application includes the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0065] This article uses specific examples to illustrate the working principle and implementation method of the circuit of the present application. The description of the above embodiments is only used to help understand the specific settings and core ideas of the present application. At the same time, for those skilled in the art, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

[0066] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application shall be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An interleaved active clamping forward circuit, characterized in that: The circuit comprises: A first voltage converter, a second voltage converter, a first rectifier tube, a second rectifier tube, a freewheeling tube, a freewheeling inductor and an output capacitor; The output capacitor is connected in parallel between the positive electrode of the output voltage and the negative electrode of the output voltage; The first end of the secondary winding of the first voltage converter is connected to the first end of the freewheeling tube, and is connected to the positive electrode of the output voltage through the freewheeling inductor; The second end of the secondary winding of the first voltage converter is connected in series with the first rectifier tube and then connected to the second end of the freewheeling tube, and is also connected to the negative electrode of the output voltage; The first end of the secondary winding of the second voltage converter is connected to the first end of the freewheeling tube, and is connected to the positive electrode of the output voltage through the freewheeling inductor; The second end of the secondary winding of the second voltage converter is connected in series with the second rectifier tube and then connected to the negative electrode of the output voltage and grounded.

2. The interleaved active clamp forward circuit according to claim 1, characterized in that: The circuit further comprises: The first end of the primary winding of the first voltage converter is connected to the positive electrode of the power supply, and the second end of the primary winding of the first voltage converter is connected to the negative electrode of the power supply through the first switch tube; the second end of the primary winding of the first voltage converter is also connected to the negative electrode of the power supply through the first clamping circuit, and the first clamping circuit is connected in parallel with the first switch tube; The first end of the primary winding of the second voltage converter is connected to the positive electrode of the power supply, and the second end of the primary winding of the second voltage converter is connected to the negative electrode of the power supply through a second switching tube; the second end of the primary winding of the second voltage converter is also connected to the negative electrode of the power supply through a second clamping circuit, and the second clamping circuit is connected in parallel with the second switching tube.

3. The interleaved active clamp forward circuit according to claim 2, characterized in that: The circuit further comprises: The first clamping circuit includes a first resonant tube and a first capacitor, the first capacitor and the first resonant tube are connected in series, the first capacitor is connected to the second end of the primary winding of the first voltage converter, and the first resonant tube is connected to the negative electrode of the power supply; The second clamping circuit includes a second resonant tube and a second capacitor, the second capacitor and the second resonant tube are connected in series, the second capacitor is connected to the second end of the primary winding of the second voltage converter, and the second resonant tube is connected to the negative electrode of the power supply.

4. The interleaved active clamping forward circuit according to claim 3, characterized in that: The circuit further comprises: The first end of the primary winding of the first voltage converter is connected to the positive electrode of the power supply through a first current transformer; The first end of the primary winding of the second voltage converter is connected to the positive electrode of the power supply through a second current transformer.

5. The interleaved active clamp forward circuit according to claim 4, characterized in that: The circuit further comprises: A controller, wherein a first output end of the controller is connected to a control end of the first rectifier tube, a second output end of the controller is connected to a control end of the second rectifier tube, and a third output end of the controller is connected to a control end of the freewheeling tube; The fourth output end of the controller is connected to the control end of the first switch tube, and the fifth output end of the controller is connected to the control end of the first resonance tube; The sixth output end of the controller is connected to the control end of the second switch tube, and the seventh output end of the controller is connected to the control end of the second resonance tube.

6. The interleaved active clamp forward circuit according to claim 5, characterized in that: The first switch tube and the second switch tube are both N-type MOS tubes, and the first resonance tube and the second resonance tube are both P-type MOS tubes.

7. The interleaved active clamp forward circuit according to any one of claims 1 to 6, characterized in that: The first rectifier tube, the second rectifier tube and the freewheeling tube are all N-type MOS tubes, or are all diodes.

8. The interleaved active clamp forward circuit according to claim 7, characterized in that: The parameters of the first rectifier tube and the second rectifier tube are the same.

9. A power supply, characterized in that: It comprises the interleaved active clamping forward circuit as described in any one of claims 1 to 8.

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