CN210074764U - Active clamping circuit and active clamping system - Google Patents
Active clamping circuit and active clamping system Download PDFInfo
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- CN210074764U CN210074764U CN201920322101.9U CN201920322101U CN210074764U CN 210074764 U CN210074764 U CN 210074764U CN 201920322101 U CN201920322101 U CN 201920322101U CN 210074764 U CN210074764 U CN 210074764U
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Abstract
The utility model discloses an active clamp circuit, active clamp circuit system, including input circuit, transformer and output circuit, input circuit includes clamp circuit module and discharge circuit module, clamp circuit module includes second electric capacity and second switch tube, the second electric capacity is clamp electric capacity, the second switch tube is the clamp 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 embodiment of the utility model provides a with the parallelly connected discharge circuit module of clamp electric capacity among the active clamp circuit, avoided the voltage peak energy on the clamp electric capacity to cause the harm to the clamp switch tube, solve the surge impact problem to the clamp switch tube.
Description
Technical Field
The utility model relates to a circuit design field especially relates to an active clamp circuit and 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.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an active clamping system and active clamping circuit, this active clamping circuit adopt a simple and easy circuit, add the discharge circuit module, can effectively eliminate the surge impulse current of the quick-witted clamping capacitor to the switch tube in the twinkling of an eye in active clamping circuit.
A first aspect of an embodiment of the present invention 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;
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.
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;
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.
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;
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.
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;
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 the 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.
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.
The utility model discloses in, active clamp circuit includes input circuit, transformer and output circuit, input circuit includes clamp circuit module and discharge circuit module, clamp circuit module includes second electric capacity and second switch tube, the second electric capacity is clamp electric capacity, the second switch tube is clamp 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 of the utility model is connected with the discharge circuit module in parallel, thereby avoiding the damage to the clamping switch tube caused by the fact that the voltage peak energy generated on the clamping capacitor can not be released due to the existence of the leakage inductance of the transformer; 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.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the background of the present invention, the drawings related to the embodiments or the background of the present invention will be briefly described below.
Fig. 1 is a schematic diagram of an active clamp circuit according to an embodiment of the present invention;
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 circuit system according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The terms "first," "second," and the like in the description and in the claims, and in the drawings described above, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, system, 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 invention. 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. The peak voltage generated by leakage inductance is generally suppressed by adopting a resistor, a capacitor, a diode or a Zener clamp and consuming energy, and the power supply efficiency is relatively low; 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 problem, an embodiment of the present invention provides an active clamp circuit 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 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 clamp capacitor parallel discharge circuit module in the active clamp circuit in the embodiment of the present invention avoids the damage to the clamp switch tube due to the voltage peak energy generated on the clamp capacitor unable to be released due to the existence of the transformer leakage inductance; 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.
The embodiments of the present invention will be described with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic diagram of an active clamp circuit according to an embodiment of the present invention, 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 tube Q2, the second capacitor C2 is a clamp capacitor, and the second switch tube Q2 is a clamp switch tube; 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 to a specified 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 anode 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.
An embodiment of the present invention further provides an active clamping system, please refer to fig. 4, where fig. 4 is a schematic diagram of the active clamping system, and the active clamping system 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.
It should be noted that, for the sake of simplicity, the aforementioned embodiments of the present invention are described as a series of combinations of actions, but it should be understood by those skilled in the art that the present invention is not limited by the described order of actions, because some steps can be performed in other orders or simultaneously according to the present invention. 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 by the invention.
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 several embodiments provided in the present disclosure, 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 invention 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 embodiments of the present invention have been described in detail, and the principles and embodiments of the present invention have been explained herein using specific embodiments, and the above description of the embodiments is only used to help understand the present invention and its core ideas; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (9)
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 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.
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 the transformer secondary winding is connected with the anode of the diode, the cathode of the 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 transformer secondary winding 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 claim 2 or 3, wherein the discharge circuit module is a purely passive discharge circuit module or a driving 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 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.
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 the secondary winding of the transformer is connected with the anode of the diode, the cathode of the 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.
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| CN110892623A (en) * | 2019-03-13 | 2020-03-17 | 深圳欣锐科技股份有限公司 | Active clamping circuit, manufacturing method thereof and active clamping system |
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Cited By (1)
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| CN110892623A (en) * | 2019-03-13 | 2020-03-17 | 深圳欣锐科技股份有限公司 | Active clamping circuit, manufacturing method thereof and active clamping system |
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