Interleaved active clamping forward circuit and power source

Abstract

An interleaved active clamping forward circuit and a power source. The circuit comprises a first voltage converter, a second voltage converter, a first rectifier diode, a second rectifier diode, a flyback diode, a flyback inductor and an output capacitor, wherein the output capacitor is connected in parallel between a positive terminal of an output voltage and a negative terminal of the output voltage; a first end of a secondary winding of the first voltage converter is connected to a first end of the flyback diode, and is connected to the positive terminal of the output voltage by means of the flyback inductor; a second end of the secondary winding of the first voltage converter is connected in series to the first rectifier diode and is then connected to a second end of the flyback diode, and same is also connected to the negative terminal of the output voltage, and the negative terminal of the output voltage is grounded; and a first end of a secondary winding of the second voltage converter is connected to the first end of the flyback diode.

Description

Interleaved active clamp forward circuit and power supply

[0001] The present application claims priority to the Chinese patent application No. 202411232462.6, filed on September 3, 2024, and entitled "Interleaved active clamp forward circuit and power supply", the whole content of the above application is incorporated herein by reference. TECHNICAL FIELD

[0002] Embodiments of the present application relate to, but are not limited to, the technical field of circuit, and specifically relate to an interleaved active clamp forward circuit and power supply. BACKGROUND

[0003] With the development of electronic technology, the volume design of high power density power supply products is also getting smaller and smaller. For example, the volume design of DC-DC converter in the power supply also needs to be smaller and smaller. Some DC-DC converters use a conventional interleaved active clamp forward circuit, and each transformer needs to be configured with a separate freewheeling tube and freewheeling inductor and other components, so that the space occupied by the components in the DC-DC converter is large, resulting in a large volume of the entire product and high cost. SUMMARY

[0004] The purpose of the present application is to provide an interleaved active clamp forward circuit and power supply, by improving the topology of the circuit, so that the first voltage converter secondary winding and the second voltage converter secondary winding can share the same freewheeling tube and freewheeling inductor, reducing the setting of components, so that the volume of the device with the circuit can be set smaller, and the overall cost is reduced.

[0005] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0006] In a first aspect, the present application provides an interleaved active clamp forward circuit, which 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 output voltage and the negative output voltage.

[0007] The first end of the first voltage converter secondary winding is connected to the first end of the freewheeling tube, and is connected to the positive output voltage through the freewheeling inductor. The second end of the first voltage converter secondary winding is connected to the second end of the freewheeling tube in series with the first rectifier tube, and is connected to the negative output voltage.

[0008] The first end of the second voltage converter secondary winding is connected to the first end of the freewheeling tube, and is connected to the positive output voltage through the freewheeling inductor. The second end of the second voltage converter secondary winding is connected to the negative output voltage and grounded after being connected in series with the second rectifier tube.

[0009] In a possible design of the first aspect, the circuit further includes:

[0010] The first end of the first voltage converter primary winding is connected to the positive pole of the power supply, and the second end of the first voltage converter primary winding is connected to the negative pole of the power supply through the first switch tube. The second end of the first voltage converter primary winding is also connected to the negative pole of the power supply through the first clamping circuit, and the first clamping circuit is connected in parallel with the first switch tube.

[0011] The first end of the second voltage converter primary winding is connected to the positive pole of the power supply, and the second end of the second voltage converter primary winding is connected to the negative pole of the power supply through the second switch tube. The second end of the second voltage converter primary winding is also connected to the negative pole of the power supply through the second clamping circuit, and the second clamping circuit is connected in parallel with the second switch tube.

[0012] In a possible design of the first aspect, the circuit further includes:

[0013] 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 first voltage converter primary winding, and the first resonant tube is connected to the negative pole of the power supply.

[0014] The second clamping circuit 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 second voltage converter primary winding, and the second resonant tube is connected to the negative pole of the power supply.

[0015] In a possible design of the first aspect, the circuit further includes:

[0016] The first end of the first voltage converter primary winding is connected to the positive pole of the power supply through the first current transformer. The first end of the second voltage converter primary winding is connected to the positive pole of the power supply through the second current transformer.

[0017] In a possible design of the first aspect, the circuit further includes a controller, a first output end of the controller is connected to the control end of the first rectifier tube, a second output end of the controller is connected to the control end of the second rectifier tube, and a third output end of the controller is connected to the control end of the freewheeling tube.

[0018] A fourth output end of the controller is connected to the control end of the first switch tube, and a fifth output end of the controller is connected to the control end of the first resonant tube. A sixth output end of the controller is connected to the control end of the second switch tube, and a seventh output end of the controller is connected to the control end of the second resonant tube.

[0019] In a possible design of the first aspect, the first switch tube and the second switch tube are both N-type MOS tubes, and the first resonant tube and the second resonant tube are both P-type MOS tubes.

[0020] 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.

[0021] In a possible design of the first aspect, the first rectifier tube and the second rectifier tube have the same parameters.

[0022] In a second aspect, the present application provides a power supply comprising the interleaved active clamp forward circuit of the first aspect or any possible design thereof.

[0023] In a third aspect, the present application provides an electronic device comprising the interleaved active clamp forward circuit of the first aspect or any possible design thereof, or comprising the power supply of the second aspect.

[0024] It can be understood that the power supply of the second aspect and the electronic device of the third aspect can achieve the beneficial effects as described in the first aspect or any possible design thereof, which will not be described here again.

[0025] The interleaved active clamp forward circuit and the power supply provided by the present application improve the topology of the circuit, so that 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 case 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, the overall number of components is reduced, the size of the device with the circuit can be set smaller, and the overall cost is reduced. Due to the reduction of the number of components, the power consumption of the overall circuit is reduced, and the conversion efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0027] FIG. 1 is a structural schematic diagram of an interleaved active clamp forward circuit provided by an embodiment of the present application;

[0028] FIG. 2 is a circuit schematic diagram of an interleaved active clamp forward circuit provided by an embodiment of the present application.

[0029] Embodiments of the present application

[0030] The technical solutions in the present application will be described below with reference to the drawings.

[0031] In the embodiments of the present application, the word "exemplary" or "for example" is used to mean serving as an example, instance, or illustration. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the embodied examples are presented as illustrative of the present application. Accordingly, the word "exemplary" or "for example" should not be interpreted as meaning "preferred" or "advantageous".

[0032] In the embodiments of the present application, the terms "first", "second", etc. are used only for the purpose of description, and should not be interpreted as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0033] It should be understood that the terms used in the description of various described examples herein are merely for the purpose of describing particular embodiments and are not intended to be limiting. As used in the description of various described examples, the singular forms "a", "an", and "the" are intended to include plural forms as well, unless the context clearly indicates otherwise.

[0034] In this application, "at least one" means one, two, or more, and "multiple" means two or more. "At least one of the following (a)" or the like means any combination of the items, including a single item or a combination of multiple items. For example, at least one of a, b, or c can mean a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be a single item or multiple items.

[0035] It should also be understood that, in the present application, unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, "connection" can be fixed connection, sliding connection, detachable connection, or integral, etc. It can be directly connected or indirectly connected through an intermediate medium.

[0036] It should also be understood that the term "includes" (also referred to as "includes", "including", "comprises" and / or "comprising") when used in the present specification specifies the presence of stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0037] It should be understood that the "one embodiment", "another embodiment", "a possible implementation" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiments or implementations 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 implementation" appearing throughout the specification does 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.

[0038] It should also be understood that the specific values mentioned in the embodiments of the present application are not limited to the specific dimensions of the specific features, and the related values can be for the convenience of understanding or the best theoretical value of a certain feature. In practice, the related dimensions can be a range around the value, for example, the range can be ±10% of the best theoretical value, or ±20% of the best theoretical value, and in practice, the corresponding technical effect can be achieved.

[0039] Exemplarily, some DC-DC converters adopt a conventional interleaved active clamp forward circuit, and each transformer needs to be configured with a separate freewheeling tube and a freewheeling inductor and the like. Therefore, in the DC-DC converter, the space occupied by the components is large, resulting in a large volume of the entire product and a high cost.

[0040] In order to solve the above technical problems, the embodiments of the present application provide an interleaved active clamp forward circuit to solve the problem that each transformer in the DC-DC converter needs to be provided with a separate freewheeling tube and a freewheeling inductor and the like. The DC-DC converter circuit topology structure can be optimized, the setting of similar components can be reduced, and the volume of the DC-DC converter can be set smaller.

[0041] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of an interleaved active clamp forward circuit provided by an embodiment of the present application. As shown in FIG. 1, the interleaved active clamp forward circuit provided by the embodiment of the present application includes a first voltage converter T1, a second voltage converter T2, 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.

[0042] The first end of the secondary winding of the first voltage converter T1 is connected with the first end of the freewheeling tube, and is connected with 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 with the second end of the freewheeling tube after being connected in series with the first rectifier tube, and is connected to the negative electrode of the output voltage. 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 with the freewheeling tube is also grounded.

[0043] The first end of the secondary winding of the second voltage converter T2 is connected with the first end of the freewheeling tube, and is connected with 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 with the negative electrode of the output voltage after being connected with the second rectifier tube in series, and is grounded.

[0044] In the embodiment of the present application, the topology structure of the DC-DC converter circuit is improved, so that 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 case that the secondary winding of each voltage converter needs to be provided with a separate freewheeling tube and freewheeling inductor, at least one freewheeling tube and freewheeling inductor are reduced, the setting of the components is reduced as a whole, the volume of the DC-DC converter can be set smaller, and the overall cost is reduced. Since the setting of the components is reduced as a whole, the power consumption of the entire DC-DC converter is reduced, and the conversion efficiency is improved.

[0045] In an embodiment of the present application, the first rectifier tube, the second rectifier tube and the freewheeling tube are MOS tubes, wherein the first rectifier tube, the second rectifier tube and the freewheeling tube can all be N-type MOS tubes, or the first rectifier tube, the second rectifier tube and the freewheeling tube can also be diodes, and the parameters of the first rectifier tube and the second rectifier tube can be set to be the same. For the convenience of description, the first rectifier tube is MOS tube Q1, the second rectifier tube is MOS tube Q2, and the freewheeling tube is MOS tube Q3.

[0046] Referring to FIG. 2, FIG. 2 is a circuit schematic diagram of an interleaved active clamp forward circuit provided in an embodiment of the present application. As shown in FIG. 2, the first end of the secondary winding of the first voltage converter T1 is connected with the drain of MOS tube Q3, and the first end of the secondary winding of the first voltage converter T1 is connected with the first end of the freewheeling inductor, and the second end of the freewheeling inductor is connected with the positive electrode of the output voltage.

[0047] The second end of the secondary winding of the first voltage converter T1 is connected with the drain of MOS tube Q1, the source of MOS tube Q1 is connected with the source of MOS tube Q3, and the source of MOS tube Q1 and the source of MOS tube Q3 are both connected with the negative electrode of the output voltage, and the negative electrode of the output voltage is grounded.

[0048] The first end of the secondary winding of the second voltage converter T2 is connected with the drain of MOS tube Q3, and the first end of the secondary winding of the second voltage converter T2 is also connected with the first end of the freewheeling inductor, and the second end of the freewheeling inductor is connected with the positive electrode of the output voltage.

[0049] The second end of the secondary winding of the second voltage converter T2 is connected with the drain of MOS tube Q2, and the source of MOS tube Q2 is connected with the negative electrode of the output voltage and is grounded.

[0050] The first end of the output capacitor is connected between the positive pole 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 pole of the output voltage. The output capacitor, the freewheeling inductor and the freewheeling diode can form a loop.

[0051] According to the above arrangement, 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 transistor Q3 and are both connected to the first end of the freewheeling inductor, and are connected to the positive pole 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 pole of the output voltage through a rectifier diode. That is, the first voltage converter T1 and the second voltage converter T2 share the same freewheeling diode and the same freewheeling inductor.

[0052] In an 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, and the second end of the primary winding of the first voltage converter T1 is connected to the negative pole of the power supply through the first switch tube and grounded. The second end of the primary winding of the first voltage converter T1 is also connected to the negative pole 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.

[0053] The first end of the primary winding of the second voltage converter T2 is connected to the positive pole of the power supply, and the second end of the primary winding of the second voltage converter T2 is connected to the negative pole 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 pole of the power supply through the second clamping circuit 20 and grounded, and the second clamping circuit 20 is connected in parallel with the second switch tube.

[0054] According to the above arrangement, the first switch tube is the main switch tube of the first voltage converter T1, and the second switch tube is the main switch tube of the second voltage converter T2.

[0055] In an 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 pole 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 pole of the power supply.

[0056] In an embodiment of the present application, the first switch tube, the first resonant tube, the second switch tube and the second resonant tube are MOS tubes, wherein the first switch tube and the second switch tube can be N-type MOS tubes, and the first resonant tube and the second resonant tube can be P-type MOS tubes. For the convenience of description, the first switch tube is MOS tube Q4, the first resonant tube is MOS tube Q5, the second switch tube is MOS tube Q6, and the second resonant tube is MOS tube Q7.

[0057] As shown in FIG. 2, 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 pole 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 pole of the power supply and grounded. The first capacitor and the MOS tube Q5 form a series connection, and the whole after the series connection of the first capacitor and the MOS tube Q5 is connected in parallel with the first switch tube.

[0058] 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 pole 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 pole of the power supply and grounded. The second capacitor and the MOS tube Q7 form a series connection, and the whole after the series connection of the second capacitor and the MOS tube Q7 is connected in parallel with the second switch tube.

[0059] In an 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.

[0060] The first current transformer and the second current transformer are used to sample the current signals of the switch tubes on the primary winding, and are used to adjust the duty cycle.

[0061] In an embodiment of the present application, the circuit further comprises a controller (DSP), the controller comprises a plurality of output terminals for connecting with different elements, the controller can accept the signals sampled by the first current transformer and the second current transformer, and output corresponding control signals to control the working states of the elements. Wherein, 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 resonant 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 resonant tube.

[0062] Specifically, as shown in FIG. 2, a first output (S1) of the controller (DSP) is connected with a gate of MOS Q1, for outputting a control signal to control the working state of MOS Q1. A second output (S2) of the controller is connected with a gate of MOS Q2, for outputting a control signal to control the working state of MOS Q2. A third output (S3) of the controller is connected with a gate of MOS Q3, for outputting a control signal to control the working state of MOS Q3. A fourth output (S4) of the controller is connected with a gate of MOS Q4, for outputting a control signal to control the working state of MOS Q4. A fifth output (S5) of the controller is connected with a gate of MOS Q5, for outputting a control signal to control the working state of MOS Q5. A sixth output (S6) of the controller is connected with a gate of MOS Q6, for outputting a control signal to control the working state of MOS Q6. A seventh output (S7) of the controller is connected with a gate of MOS Q7, for outputting a control signal to control the working state of MOS Q7.

[0063] In the embodiment of the present application, two working circuits are included, one of which is mainly composed of the first current transformer TR1, the first switch tube Q4, the first resonant tube Q5, the first capacitor C1, the first voltage converter T1T1, the first rectifier tube Q1, the freewheeling tube Q3 and the freewheeling inductor L. The other working circuit is mainly composed of the second current transformer TR2, the second switch tube Q6, the second resonant tube Q7, the second capacitor C2, the second voltage converter T2T2, the second rectifier tube Q2, the freewheeling tube Q3 and the freewheeling inductor L.

[0064] The first current transformer TR1 and the second current transformer TR2 respectively sample current signals to the controller DSP for processing. In one clock cycle, one of the working circuits works in the upper half cycle and the other works in the lower half cycle, and the conduction duty ratio 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 conductive, the second rectifier tube Q2 is controlled to be non-conductive, and when the controller DSP controls the second rectifier tube Q2 to be conductive, the first rectifier tube Q1 is controlled to be non-conductive, so as to ensure that the first rectifier tube Q1 and the second rectifier tube Q2 are not conductive at the same time. The freewheeling tube Q3 and the freewheeling inductor L are devices shared by the two working circuits.

[0065] The embodiment of the present application also provides a power supply, which includes the interleaved active clamp forward circuit in any of the above embodiments.

[0066] The embodiment of the present application also provides an electronic device, which includes the interleaved active clamp forward circuit in any of the above embodiments. Alternatively, the electronic device includes the power supply in the above embodiment.

[0067] It is easy to understand that, since the power supply provided by the present embodiment and the electronic device, the specific content and specific implementation method related to the improvement points of the present application are all described in detail in the above staggered active embedded forward circuit embodiment, therefore, it is not repeated here.

[0068] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

[0069] Each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between each embodiment can be referred to each other.

[0070] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic creative concept. Therefore, the protection scope of the present application includes the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present application.

[0071] The working principle and implementation of the circuit of the present application are described by applying specific examples in this paper, and the above embodiment description 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 idea of the present application, there will be changes in specific implementation and application range, and the above description should not be understood as a limitation of the present application.

[0072] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited to this, any change or replacement within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An interleaved active insertion forward circuit, wherein, 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 a positive output voltage terminal and a negative output voltage terminal; a first end of a secondary winding of the first voltage converter is connected to a first end of the freewheeling tube and connected to the positive output voltage terminal through the freewheeling inductor; a second end of the secondary winding of the first voltage converter is connected to a second end of the freewheeling tube in series with the first rectifier tube and connected to the negative output voltage terminal; a first end of a secondary winding of the second voltage converter is connected to the first end of the freewheeling tube and connected to the positive output voltage terminal through the freewheeling inductor; a second end of the secondary winding of the second voltage converter is connected to the negative output voltage terminal in series with the second rectifier tube and grounded.

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

3. The interleaved, actively inserted forward converter of claim 2, wherein, the first clamping circuit comprises 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, and the first resonant tube is connected to the negative terminal of the power supply; the second clamping circuit comprises 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, and the second resonant tube is connected to the negative terminal of the power supply.

4. The interleaved, actively inserted forward converter of claim 3, wherein, a first end of the primary winding of the first voltage converter is connected to the positive terminal of the power supply through a first current transformer; a first end of the primary winding of the second voltage converter is connected to the positive terminal of the power supply through a second current transformer.

5. The interleaved, actively inserted forward converter of any one of claims 1 to 4, wherein, The circuit further comprises: a controller, 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; a fourth output end of the controller is connected to a control end of the first switch tube, and a fifth output end of the controller is connected to a control end of the first resonant tube; a sixth output end of the controller is connected to a control end of the second switch tube, and a seventh output end of the controller is connected to a control end of the second resonant tube.

6. The interleaved, actively inserted forward-coupled circuit of claim 5, wherein, The first switch tube and the second switch tube are both N-type MOS tubes, and the first resonant tube and the second resonant tube are both P-type MOS tubes.

7. The interleaved forward biased active pin diode circuit of any one of claims 1 to 6, wherein, 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, actively inserted forward-coupled circuit of claim 7, wherein, The first rectifier tube and the second rectifier tube have the same parameters.

9. A power supply, wherein, The interleaved active clamp forward circuit as claimed in any one of claims 1 to 8.

10. An electronic device, comprising: The interleaved active clamp forward circuit as claimed in any one of claims 1 to 8, or the power supply as claimed in claim 9.

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