Active clamping circuit, manufacturing method thereof and active clamping system

文档序号：1432403 发布日期：2020-03-17 浏览：20次中文

阅读说明：本技术 有源钳位电路及其制造方法和有源钳位系统 (Active clamping circuit, manufacturing method thereof and active clamping system ) 是由李祥赵德琦吴壬华于 2019-03-13 设计创作，主要内容包括：本申请公开了一种有源钳位电路、有源钳位电路系统和有源钳位电路制造方法,包括输入电路、变压器和输出电路,所述输入电路包括钳位电路模块和放电电路模块,所述钳位电路模块包括第二电容和第二开关管,所述第二电容为钳位电容,所述第二开关管为钳位开关管；所述输入电路外接输入电源,所述钳位电容和所述放电电路模块并联,所述输入电路通过变压器与所述输出电路连接,所述输出电路连接负载。本申请实施例将有源钳位电路中的钳位电容并联放电电路模块,避免了钳位电容上的电压尖峰能量对钳位开关管造成损害,解决对钳位开关管的浪涌冲击问题。(The application discloses an active clamping circuit, an active clamping circuit system and an active clamping circuit manufacturing method, which comprise an input circuit, a transformer and an output circuit, wherein the input circuit comprises a clamping circuit module and a discharge circuit module, the clamping circuit module comprises a second capacitor and a second switch tube, the second capacitor is a clamping capacitor, and the second switch tube is a clamping switch tube; the input circuit is externally connected with an input power supply, the clamping capacitor is connected with the discharge circuit module in parallel, the input circuit is connected with the output circuit through a transformer, and the output circuit is connected with a load. According to the embodiment of the application, the clamping capacitors in the active clamping circuit are connected in parallel with the discharge circuit module, so that the clamping switch tube is prevented from being damaged by voltage spike energy on the clamping capacitors, and the problem of surge impact on the clamping switch tube is solved.)

1. An active clamping circuit is characterized by comprising an input circuit, a transformer and an output circuit, wherein the input circuit comprises a clamping circuit module and a discharge circuit module, the clamping circuit module comprises a second capacitor and a second switching tube, the second capacitor is a clamping capacitor, and the second switching tube is a clamping switching tube;

the input power supply is used for providing voltage for the input circuit, the input circuit is used for connecting the input power supply and maintaining stable voltage, the clamping circuit module is used for fixing the voltage peak value of the input power supply on a preset voltage value, the discharging circuit module is used for eliminating surge impact current of the clamping circuit module, and the output circuit is used for stabilizing output voltage.

2. The active clamp circuit of claim 1, wherein the input circuit further comprises a first capacitor, a fourth capacitor, and a first switching tube, and the output circuit comprises a diode and a third capacitor;

the input circuit is a primary winding circuit of the transformer, the anode of the input circuit is connected with the anode of the first capacitor, one end of the discharge circuit module, one end of the clamping circuit module and one end of the primary winding of the transformer, the clamping circuit module is connected with the primary winding of the transformer in parallel, the other end of the primary winding of the transformer is connected with one end of the first switch tube, the fourth capacitor is connected with the first switch tube in parallel, and the other end of the first switch tube is connected with the cathode of the first capacitor and the cathode of the input circuit;

the output circuit is a transformer secondary winding circuit, one end of a secondary winding of the transformer is connected with the anode of the first diode, the cathode of the first diode is connected with the anode of the third capacitor to form positive output, and the cathode of the third capacitor is connected with the other end of the secondary winding of the transformer to form negative output.

3. The active clamping circuit of claim 2, wherein one end of the second capacitor is connected to the positive electrode of the input circuit, and one end of the second capacitor is further connected to one end of the first capacitor, one end of the discharge circuit module, and one end of the primary winding of the transformer; the other end of the second capacitor is connected with one end of the second switch tube and the other end of the discharge circuit module, and the other end of the second switch tube is connected with the other end of the primary winding of the transformer and one end of the first switch tube.

4. The active clamp circuit of any one of claims 1-3, wherein the discharge circuit module is a purely passive discharge circuit module or a driven discharge circuit module for providing a discharge loop for the second capacitor.

5. The active clamping circuit of claim 4, wherein the discharge circuit module is the purely passive discharge circuit module, one end of the purely passive discharge circuit module is connected to the positive electrode of the input circuit, and one end of the purely passive discharge circuit module is further connected to one end of the second capacitor, one end of the first capacitor, and one end of the primary winding of the transformer; and the other end of the pure passive discharge circuit module is connected with the other end of the second capacitor.

6. The active clamp circuit of claim 4, wherein the discharge circuit module is a driving discharge circuit module, the driving discharge circuit module includes a discharge circuit driver and a discharge element, the discharge circuit driver is connected to the discharge element, and the driving discharge circuit module is connected in parallel to the second capacitor.

7. An active clamping system comprising the active clamping circuit of any one of claims 1-6, an input power supply, and a load;

the input power supply, the active clamping circuit and the load are connected in sequence;

the input power supply is used for providing voltage for the active clamping circuit and a load, the active clamping circuit is used for connecting the input power supply and maintaining stable voltage, and the load is used for connecting the active clamping circuit and consuming voltage.

8. The active clamping system of claim 7, wherein the active clamping circuit comprises an input circuit, a transformer, and an output circuit, wherein the input circuit comprises a clamping circuit module and a discharge circuit module, wherein the clamping circuit module comprises a second capacitor and a second switch tube, wherein the second capacitor is a clamping capacitor, and wherein the second switch tube is a clamping switch tube;

the input circuit is externally connected with the input power supply, the clamping capacitor is connected with the discharge circuit module in parallel, the input circuit is connected with the output circuit through a transformer, and the output circuit is connected with a load;

9. The active clamping system of claim 8, wherein the input circuit further comprises a first capacitor, a fourth capacitor and a first switch tube, the output circuit comprises a diode and a third capacitor, and the discharge circuit module is a purely passive discharge circuit module or a driving discharge circuit module;

the input circuit is the primary winding circuit of the transformer, the anode of the input circuit is connected with the anode of the input power supply, the anode of the first capacitor, one end of the discharge circuit module, one end of the clamping circuit module and one end of the primary winding of the transformer, the clamping circuit module is connected with the primary winding of the transformer in parallel, the other end of the primary winding of the transformer is connected with one end of the first switch tube, the fourth capacitor is connected with the first switch tube in parallel, the other end of the first switch tube is connected with the cathode of the first capacitor and the cathode of the input circuit, and the cathode of the input circuit is connected with the cathode of the input power supply;

the output circuit is a transformer secondary winding circuit, one end of a secondary winding of the transformer is connected with the anode of the first diode, the cathode of the first diode is connected with one end of the third capacitor to form positive output, the other end of the third capacitor is connected with the other end of the secondary winding of the transformer to form negative output, and the positive output and the negative output are connected with the load.

10. A method for manufacturing an active clamping circuit is applied to the active clamping circuit comprising an input circuit, a transformer and an output circuit, wherein the input circuit comprises a clamping circuit module and a discharge circuit module, the clamping circuit module comprises a second capacitor and a second switch tube, the second capacitor is a clamping capacitor, the second switch tube is a clamping switch tube, and the method comprises the following steps:

the input circuit is externally connected with an input power supply, the input circuit is connected with the output circuit through a transformer, the output circuit is connected with a load, and the input circuit comprises a clamping circuit module and a discharging circuit module;

connecting the clamping capacitor and the discharge circuit module in parallel;

Technical Field

The present disclosure relates to the field of circuit design, and in particular, to an active clamp circuit, a method for manufacturing the same, and an active clamp system.

Background

In recent years, with the development and innovation of power electronic technology, switching power supplies are widely used in electronic devices. The switching power supply is a power supply which maintains stable output voltage by controlling the on-off time of a switching tube. Due to the existence of the leakage inductance of the transformer, high peak voltage is generated in a circuit, and a switch tube can be broken down.

Disclosure of Invention

The embodiment of the application provides an active clamping circuit, a manufacturing method thereof and an active clamping system, wherein the active clamping circuit adopts a simple circuit, and a discharge circuit module is added, so that the surge impact current of a switching tube caused by a switching-on instant clamping capacitor in the active clamping circuit can be effectively eliminated.

A first aspect of an embodiment of the present application provides an active clamp circuit, including an input circuit, a transformer, and an output circuit, where the input circuit includes a clamp circuit module and a discharge circuit module, the clamp circuit module includes a second capacitor and a second switch tube, the second capacitor is a clamp capacitor, and the second switch tube is a clamp switch tube;

In one embodiment, the input circuit further comprises a first capacitor, a fourth capacitor and a first switch tube, and the output circuit comprises a diode and a third capacitor;

In one embodiment, one end of the second capacitor is connected to the positive electrode of the input circuit, and one end of the second capacitor is further connected to one end of the first capacitor, one end of the discharge circuit module, and one end of the primary winding of the transformer; the other end of the second capacitor is connected with one end of the second switch tube and the other end of the discharge circuit module, and the other end of the second switch tube is connected with the other end of the primary winding of the transformer and one end of the first switch tube.

In one embodiment, the discharge circuit module is a pure passive discharge circuit module or a driving discharge circuit module, and is configured to provide a discharge loop for the second capacitor.

In one embodiment, the discharge circuit module is the purely passive discharge circuit module, one end of the purely passive discharge circuit module is connected to the positive electrode of the input circuit, and one end of the purely passive discharge circuit module is further connected to one end of the second capacitor, one end of the first capacitor, and one end of the primary winding of the transformer; and the other end of the pure passive discharge circuit module is connected with the other end of the second capacitor.

In one embodiment, the discharge circuit module is a driving discharge circuit module, the driving discharge circuit module includes a discharge circuit driver and a discharge element, the discharge circuit driver is connected with the discharge element, and the driving discharge circuit module is connected with the second capacitor in parallel.

A second aspect of the embodiments of the present application provides an active clamp system, including the above active clamp circuit, an input power supply, and a load;

the input power supply, the active clamping circuit and the load are connected in sequence;

In one embodiment, the active clamping circuit comprises an input circuit, a transformer and an output circuit, the input circuit comprises a clamping circuit module and a discharge circuit module, the clamping circuit module comprises a second capacitor and a second switch tube, the second capacitor is a clamping capacitor, and the second switch tube is a clamping switch tube;

In one embodiment, the input circuit further comprises a first capacitor, a fourth capacitor and a first switch tube, the output circuit comprises a diode and a third capacitor, and the discharge circuit module is a pure passive discharge circuit module or a driving discharge circuit module;

the input circuit is the primary winding circuit of the transformer, the anode of the input circuit is connected with the anode of the input power supply, one end of the first capacitor, one end of the discharge circuit module, one end of the clamping circuit module and one end of the primary winding of the transformer, the clamping circuit module is connected with the primary winding of the transformer in parallel, the other end of the primary winding of the transformer is connected with one end of the first switch tube, the fourth capacitor is connected with the first switch tube in parallel, the other end of the first switch tube is connected with the first capacitor and the cathode of the input circuit, and the cathode of the input circuit is connected with the cathode of the input power supply;

the output circuit is a transformer secondary winding circuit, one end of a secondary winding of the transformer is connected with the anode of the first diode, the cathode of the first diode is connected with one end of the third capacitor to form positive output, the other end of the third capacitor is connected with the other end of the secondary winding of the transformer to form negative output, and the positive output and the negative output are connected with the load.

A third aspect of the embodiments of the present application provides a method for manufacturing an active clamp circuit, which is applied to an active clamp circuit including an input circuit, a transformer, and an output circuit, where the input circuit includes a clamp circuit module and a discharge circuit module, the clamp circuit module includes a second capacitor and a second switch tube, the second capacitor is a clamp capacitor, the second switch tube is a clamp switch tube, and the method includes:

connecting the clamping capacitor and the discharge circuit module in parallel;

In the application, the active clamping circuit comprises an input circuit, a transformer and an output circuit, the input circuit comprises a clamping circuit module and a discharge circuit module, the clamping circuit module comprises a second capacitor and a second switch tube, the second capacitor is a clamping capacitor, and the second switch tube is a clamping switch tube; the input circuit is externally connected with an input power supply, the clamping capacitor is connected with the discharge circuit module in parallel, the input circuit is connected with the output circuit through a transformer, and the output circuit is connected with a load; the input power supply is used for providing voltage for the input circuit, the input circuit is used for connecting the input power supply and maintaining stable voltage, the clamping circuit module is used for fixing the voltage peak value of the input power supply on a preset voltage value, the discharging circuit module is used for eliminating surge impact current of the clamping circuit module, and the output circuit is used for stabilizing output voltage. Therefore, the clamping capacitor in the active clamping circuit is connected with the discharge circuit module in parallel, so that the damage to a clamping switch tube caused by the fact that voltage peak energy generated on the clamping capacitor cannot be released due to the existence of leakage inductance of a transformer is avoided; and a clamping capacitor discharging module can be added into the active clamping circuit, so that the problem of surge impact on a clamping switch tube is solved.

These and other aspects of the present application will be more readily apparent from the following description of the embodiments.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic diagram of an active clamp circuit according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of an active clamp circuit of the embodiment of FIG. 1;

FIG. 3 is a schematic diagram of another embodiment of the active clamp circuit of FIG. 1;

fig. 4 is a schematic diagram of an active clamp circuitry provided by an embodiment of the present application;

fig. 5 is a schematic flowchart of a method for manufacturing an active clamp circuit according to an embodiment of the present disclosure.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The following are detailed below.

The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Switching power supplies are widely used in electronic devices, and there are many structures of the switching power supplies, but the core device of the switching power supplies is a transformer. The energy of the excitation inductor can be coupled to the secondary side of the transformer through an ideal transformer, while the energy of the leakage inductor can not be transferred to the secondary side of the transformer because of no coupling, and if no measure is taken, the leakage inductor releases the energy through a parasitic capacitor, so that the voltage overshoot and oscillation of the circuit are caused, and the working performance of the circuit is influenced. A resistor, a capacitor, a diode or a zener clamp is generally used to suppress the peak voltage generated by the leakage inductance in an energy-consuming manner, which is relatively low in power efficiency; or suppressed using a clamp circuit. The common active clamping circuit can reduce loss, and in the common active clamping circuit, when the power is turned off, the clamping capacitor still stores voltage peak energy generated in the last working period, so that the power cannot be discharged. When the power supply is started again, after the first switch tube is closed, the clamping capacitor continuously absorbs peak voltage generated by leakage inductance of the transformer, voltage at two ends of the clamping capacitor is higher than clamping voltage during normal work, the second switch tube is conducted, the clamping capacitor discharges through the second switch tube, the discharging current at the moment is far higher than current during normal work, larger surge current impact is generated on the second switch tube, and overcurrent damage of the second switch tube still can be caused during serious conditions.

In view of the above problems, an embodiment of the present application provides an active clamp circuit, a method for manufacturing the same, and an active clamp system, where the active clamp circuit includes an input circuit, a transformer, and an output circuit, the input circuit includes a clamp circuit module and a discharge circuit module, the clamp circuit module includes a second capacitor and a second switch tube, the second capacitor is a clamp capacitor, and the second switch tube is a clamp switch tube; wherein the content of the first and second substances,

the input circuit is externally connected with an input power supply, the clamping capacitor is connected with the discharge circuit module in parallel, the input circuit is connected with the output circuit through a transformer, and the output circuit is connected with a load; the input power supply is used for providing voltage for the input circuit, the input circuit is used for connecting the input power supply and maintaining stable voltage, the clamping circuit module is used for fixing the voltage peak value of the input power supply on a preset voltage value, the discharging circuit module is used for eliminating surge impact current of the clamping circuit module, and the output circuit is used for stabilizing output voltage. Therefore, the clamping capacitor in the active clamping circuit is connected with the discharge circuit module in parallel in the embodiment of the application, so that the damage to the clamping switch tube caused by the fact that voltage peak energy generated on the clamping capacitor cannot be released due to the existence of leakage inductance of the transformer is avoided; and a clamping capacitor discharging module can be added into the active clamping circuit, so that the problem of surge impact on a clamping switch tube is solved.

Embodiments of the present application will be described below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic diagram of an active clamp circuit 100 according to an embodiment of the present disclosure, where the active clamp circuit 100 includes an input circuit 110, a transformer 120, and an output circuit 130, the input circuit 110 includes a clamp circuit module 111 and a discharge circuit module 112, the clamp circuit module 111 includes a second capacitor C2 and a second switch Q2, the second capacitor C2 is a clamp capacitor, and the second switch Q2 is a clamp switch; wherein:

the input circuit 110 is externally connected with an input power supply, the clamping capacitor C2 is connected with the discharge circuit module 112 in parallel, the input circuit 110 is connected with the output circuit 130 through a transformer 120, and the output circuit 130 is connected with a load;

the input power supply is configured to provide a voltage for the input circuit 110, the input circuit 110 is configured to connect the input power supply and maintain a stable voltage, the clamp circuit module 111 is configured to fix a voltage peak of the input power supply at a preset voltage value, the discharge circuit module 112 is configured to eliminate an inrush current of the clamp circuit module 111, and the output circuit 130 is configured to stabilize an output voltage.

In this example, the energy of the clamping capacitor C2 is released by the discharging circuit module 112 connected in parallel to the clamping capacitor C2 when the power supply is turned off, so as to avoid surge current impact on the second switching tube Q2 and damage to the second switching tube Q2.

As a possible implementation manner, referring to fig. 1, the input circuit further includes a first capacitor C1, a fourth capacitor C4, and a first switch Q1, and the output circuit 130 includes a diode D1 and a third capacitor C3;

the input circuit 110 is the transformer primary winding circuit, an anode (HV +) of the input circuit is connected to an anode of the first capacitor C1, one end of the discharge circuit module 112, one end of the clamping circuit module 111, and one end of the transformer primary winding, the clamping circuit module 111 is connected in parallel with the transformer 120 primary winding, the other end of the transformer 120 primary winding is connected to one end of the first switch tube Q1, the fourth capacitor C4 is connected in parallel with the first switch tube Q1, and the other end of the first switch tube Q1 is connected to a cathode of the first capacitor C1 and a cathode (HV-) of the input circuit.

The output circuit 130 is a secondary winding circuit of the transformer 120, one end of the secondary winding of the transformer 120 is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the anode of the third capacitor C3 and forms a positive output (VOUT +), and the cathode of the third capacitor C3 is connected to the other end of the secondary winding of the transformer 120 and forms a negative output (VOUT-).

The first switching tube Q1 and the second switching tube Q2 both need to be connected with Pulse Width Modulation (PWM) to modulate the bias of the gate or base of the transistor, so as to change the on-time of the output transistor or the transistor of the switching regulator, that is, the first switching tube Q1 is further connected with the PWM1, the second switching tube Q2 is further connected with the PWM2, the input circuit 110 is externally connected with a high voltage input power supply, and the voltage is limited and stabilized by the clamping circuit module 111, so that the voltage of the primary winding of the transformer 120 is stabilized.

The positive electrode of the input circuit 110 is externally connected to the positive electrode of the input high-voltage power supply, the voltage of the primary winding of the transformer 120 is fixed by the clamping circuit module 111, and then the voltage is connected to the negative electrode of the input high-voltage power supply by the first switching tube Q1, and the clamping circuit module 111 is connected in parallel with the discharge circuit module 112 to release the energy on the clamping circuit module 111. The transformer 120 converts the voltage of the primary winding into a voltage of the secondary winding having the same frequency, and then connects to the load.

In this example, the voltage value can be stabilized at a designated voltage value by the clamp circuit module 111, so as to ensure the stability of the output voltage, and the discharge circuit module 112 connected in parallel to the clamp capacitor C2 can release the energy in the clamp capacitor C2, so as to avoid surge current impact on the second switching tube Q2 and damage to the second switching tube Q2.

As a possible implementation manner, referring to fig. 1, the clamping circuit module 111 includes the second capacitor C2 and the second switch Q2, an anode of the second capacitor C2 is connected to an anode of the input circuit, and an anode of the second capacitor C2 is further connected to an anode of the first capacitor C1, one end of the discharge circuit module 112, and one end of the primary winding of the transformer 120; a negative electrode of the second capacitor C2 is connected to one end of the second switching tube Q2 and the other end of the discharge circuit module 112, and the other end of the second switching tube Q2 is connected to the other end of the primary winding of the transformer 120 and one end of the first switching tube Q1.

The second capacitor C2 and the second switch Q2 are connected in series to form a clamp circuit module 111, and the clamp circuit module 111 fixes a certain part of the input circuit pulse signal at a specified voltage value and maintains the original waveform shape.

In this example, the clamping circuit module 111 is added to the circuit, so that the voltage in the circuit is kept stable, the voltage fluctuation is overcome, and the stability of the circuit voltage is ensured.

As a possible implementation manner, the discharge circuit module 112 is a pure passive discharge circuit module or a driving discharge circuit module, and is used for providing a discharge loop for the second capacitor C2.

The discharge circuit module 112 has various options, including but not limited to, a discharge circuit for actively discharging the second capacitor C2 and driving the clamp capacitor to discharge. It is within the scope of the application of the discharge circuit module 112 that the second capacitor C2 can be provided with a discharge loop when the power is turned off.

As a possible implementation manner, please refer to fig. 2, fig. 2 is a schematic diagram of an active clamp circuit, the discharge circuit module is the passive discharge circuit module 1121, one end of the passive discharge circuit module 1121 is connected to the positive electrode (HV +) of the input circuit 110, and one end of the passive discharge circuit module 1121 is further connected to the positive electrode of the second capacitor C2, the positive electrode of the first capacitor C1, and one end of the primary winding of the transformer 120; the other end of the pure passive discharge circuit module 1121 is connected to the negative electrode of the second capacitor C2.

When the discharge circuit is the passive discharge circuit module 1121, the passive discharge circuit module 1121 may be composed of a single passive element 1122, such as a resistor; or two or more passive elements 1122 may be used. When the power supply is turned off, the passive discharge circuit module 1121 and the clamping capacitor C2 form a discharge loop to release the voltage energy on the clamping capacitor C2.

In this example, the discharge circuit module adopts a purely passive discharge circuit module to perform a discharge operation on the clamping capacitor C2, so that surge impact on the second switching tube Q2 can be avoided, and the circuit is simple and low in cost.

Referring to fig. 3, fig. 3 is a schematic diagram of an active clamp circuit, the discharge circuit module is a driving discharge circuit module 1123, the driving discharge circuit module 1123 includes a discharge circuit driver 1124 and a discharge element 1125, the discharge circuit driver 1124 is connected to the discharge element 1125, and the driving discharge circuit module 1123 is connected in parallel to the second capacitor C2.

When the discharge circuit is the driving discharge circuit module 1123, the discharge circuit driver 1124 may be connected to one or more discharge elements 1125, for example, the discharge circuit driver and a resistor are connected in series to form the driving discharge circuit module. When the power supply is shut down, the active output discharge function and the second capacitor C2 form a discharge loop to release the voltage energy on the clamping capacitor.

In this example, the discharge circuit module discharges the clamping capacitor C2 by using the driving discharge circuit module 1123, so that surge impact on the second switch tube Q2 can be avoided, and the clamping capacitor C2 can be discharged quickly.

Referring to fig. 4, fig. 4 is a schematic diagram of an active clamping system, where the active clamping system 400 includes an input power source 200, an active clamping circuit 100, and a load 300;

the input power supply 200, the active clamp circuit 100 and the load 300 are connected in sequence;

the input power supply 200 is used for providing voltage for the active clamp circuit 100 and the load 300, the active clamp circuit 100 is used for connecting the input power supply 200 and maintaining stable voltage, and the load 300 is used for connecting the active clamp circuit 100 and consuming voltage.

In one possible example, referring to fig. 4, the active clamp circuit 100 includes an input circuit 110, a transformer 120, and an output circuit 130, where the input circuit 110 includes a clamp circuit module 111 and a discharge circuit module 112, the clamp circuit module 111 includes a second capacitor and a second switch, the second capacitor is a clamp capacitor, and the second switch is a clamp switch;

the input circuit 110 is connected with the input power supply 200, the second capacitor and the discharge circuit module 112 in parallel, the input circuit 110 is connected with the output circuit 130 through a transformer 120, and the output circuit 130 is connected with the load 300;

the input power supply 200 is configured to provide a voltage for the input circuit 110, the input circuit 110 is configured to connect the input power supply 200 and maintain a stable voltage, the clamp circuit module 111 is configured to fix a voltage peak of the input power supply at a preset voltage value, the discharge circuit module 112 is configured to eliminate a surge impact current of the clamp circuit module, and the output circuit 130 is configured to stabilize an output voltage.

In one possible example, the input circuit 110 includes a first capacitor, a fourth capacitor and a first switch tube, the output circuit 130 includes a diode and a third capacitor, and the discharge circuit module 112 is a purely passive discharge circuit module or a driving discharge circuit module;

the input circuit 110 is the transformer primary winding circuit, the positive electrode of the input circuit 110 is connected to the positive electrode of the input power supply 200, the positive electrode of the first capacitor, one end of the discharge circuit module 112, one end of the clamping circuit module 111 and one end of the transformer 120 primary winding, the clamping circuit module 111 and the transformer 120 primary winding are connected in parallel, the other end of the transformer 120 primary winding is connected to one end of the first switching tube, the fourth capacitor is connected in parallel to the first switching tube, the other end of the first switching tube is connected to the negative electrode of the first capacitor and the negative electrode of the input circuit 110, and the negative electrode of the input circuit 110 is connected to the negative electrode of the input power supply 200;

the output circuit 130 is a secondary winding circuit of the transformer, one end of the secondary winding of the transformer 120 is connected to the anode of the first diode, the cathode of the first diode is connected to the anode of the third capacitor to form a positive output, the cathode of the third capacitor is connected to the other end of the secondary winding of the transformer 120 to form a negative output, and the positive output and the negative output are connected to the load 300.

Therefore, the clamping capacitor in the active clamping circuit is connected with the discharge circuit module in parallel, so that the damage to a clamping switch tube caused by the fact that voltage peak energy generated on the clamping capacitor cannot be released due to the existence of leakage inductance of a transformer is avoided; and a clamping capacitor discharging module can be added into the active clamping circuit, so that the problem of surge impact on a clamping switch tube is solved.

Referring to fig. 5, fig. 5 is a schematic flowchart of a method for manufacturing an active clamp circuit according to an embodiment of the present disclosure, and the method is applied to an active clamp circuit including an input circuit, a transformer, and an output circuit, where the input circuit includes a clamp circuit module and a discharge circuit module, the clamp circuit module includes a second capacitor and a second switch tube, the second capacitor is a clamp capacitor, and the second switch tube is a clamp switch tube, and the method includes:

s501, externally connecting the input circuit with an input power supply, wherein the input circuit is connected with the output circuit through a transformer, the output circuit is connected with a load, and the input circuit comprises a clamping circuit module and a discharging circuit module;

s502, connecting the clamping capacitor and the discharge circuit module in parallel;

It should be noted that, for the sake of simplicity, the embodiments of the present application are described as a series of acts or combinations, but those skilled in the art should understand that the present application is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the above-described division of the units is only one type of division of logical functions, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application with specific examples, and the above description of the embodiments is only provided to help understand the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific implementation and application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

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Active clamping circuit, manufacturing method thereof and active clamping system

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