CN113454896A - Active clamping circuit and related equipment - Google Patents
Active clamping circuit and related equipment Download PDFInfo
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- CN113454896A CN113454896A CN202080014577.1A CN202080014577A CN113454896A CN 113454896 A CN113454896 A CN 113454896A CN 202080014577 A CN202080014577 A CN 202080014577A CN 113454896 A CN113454896 A CN 113454896A
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- 238000004804 winding Methods 0.000 claims abstract description 80
- 238000010521 absorption reaction Methods 0.000 claims abstract description 29
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 99
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 abstract description 5
- 229910010271 silicon carbide Inorganic materials 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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Abstract
The application provides an active clamping circuit and related equipment, which comprise an input circuit, a transformer and an output circuit, wherein the input circuit comprises a clamping circuit module and an absorption circuit module, and the transformer comprises a primary winding and a secondary winding; the input circuit is connected with the output circuit through the transformer; the clamping circuit module and the absorption circuit module are connected with the primary winding, and the secondary winding is connected with the output circuit; the active clamping circuit optimizes the peak voltage absorption, is beneficial to effectively inhibiting the peak voltage of the silicon carbide device, reduces electromagnetic interference, and avoids the switching loss of the main switching tube when the capacitance is large.
Description
Technical Field
Embodiments of the present disclosure relate to the field of electronic circuits, and more particularly, to an active clamp circuit and a related device.
Background
In the case of higher input bus voltage, a silicon device with higher withstand voltage is required to meet the application requirements, such as 900V or 1200V, or even higher. With the increase of the withstand voltage, the on-resistance of the silicon device is multiplied, and the on-loss is very large. In high-pressure high-power applications, this is clearly undesirable. In recent years, with the progress of technology, silicon carbide devices have entered commercial and civil fields. Compared with a silicon device, the silicon carbide device has the advantages of higher switching speed, lower on-resistance, better thermal stability and the like. The application is wider in the new energy automobile industry.
However, for a large current switch loop, a high transient spike voltage is generated due to an excessively fast current change, and the response speed of the clamp circuit cannot be satisfied due to a circuit structure and the like. At the moment when the main switching tube is turned off, the peak voltage cannot be absorbed quickly, which not only increases the electromagnetic interference, but also affects the reliability of the power supply.
Disclosure of Invention
The embodiment of the application provides an active clamping circuit and related equipment, which are beneficial to inhibiting peak voltage, improving the absorption efficiency of the peak voltage and reducing electromagnetic interference.
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 an absorption circuit module, and the transformer includes a primary winding and a secondary winding;
the input circuit is connected with the output circuit through the transformer;
the clamping circuit module and the absorption circuit module are connected with the primary winding, and the secondary winding is connected with the output circuit;
the input circuit is used for being externally connected with the input power supply through the positive port and the negative port, the output circuit is connected with a load, the clamping circuit module is used for fixing the voltage peak value of the input power supply on a preset voltage value, and the absorption circuit module is used for inhibiting the peak voltage of the clamping circuit module.
With reference to the first aspect of the embodiment of the present application, in a possible implementation manner of the first aspect of the embodiment of the present application, the clamping circuit module includes a first capacitor, a first switch tube, a second switch tube, a first diode, and a second diode, the first capacitor includes a first clamping capacitor, the first switch tube includes a first clamping switch tube, and the second switch tube includes a second clamping switch tube; the positive port of the input circuit is connected with the positive electrode of the first capacitor and one end of the primary winding of the transformer, the negative electrode of the first capacitor is connected with the drain electrode of the first switching tube and the negative electrode of the first diode, the source electrode of the first switching tube is connected with the drain electrode of the second switching tube and the positive electrode of the first diode, the other end of the primary winding of the transformer is connected with the drain electrode of the second switching tube and one end of the absorption circuit module, and the source electrode of the second switching tube is connected with the positive electrode of the second diode, the other end of the absorption circuit module and the negative port of the input circuit.
With reference to the first aspect of the embodiment of the present application, in another possible implementation manner of the first aspect of the embodiment of the present application, the absorption circuit module includes a second capacitor and a third diode, and the second capacitor includes a second clamping capacitor; the anode of the third diode and the cathode of the first diode are connected with the other end of the primary winding of the transformer, the cathode of the third diode is connected with the anode of the second capacitor and the drain of the first switch tube, and the cathode of the second capacitor is connected with the source of the second switch tube, the anode of the second diode and the cathode port of the input circuit.
With reference to the first aspect of the embodiment of the present application, in another possible implementation manner of the first aspect of the embodiment of the present application, the output circuit includes a third capacitor, a fourth diode, and a fifth diode; the positive electrode port of the output circuit is connected with the positive electrode of the third capacitor, one end of the first secondary winding and one end of the second secondary winding; the negative pole port of the output circuit is connected with the negative pole of the third capacitor, the positive pole of the fourth diode and the positive pole of the fifth diode, the negative pole of the fourth diode is connected with the other end of the first secondary winding, and the negative pole of the fifth diode is connected with the other end of the second secondary winding.
With reference to the first aspect of the embodiment of the present application, in another possible implementation manner of the first aspect of the embodiment of the present application, the input circuit further includes a fourth capacitor; and the anode of the fourth capacitor is connected with the anode port of the input circuit, and the cathode of the fourth capacitor is connected with the cathode port of the input circuit.
With reference to the first aspect of the embodiment of the present application, in another possible implementation manner of the first aspect of the embodiment of the present application, when the first switching tube is turned on and the second switching tube is turned off, the first capacitor and the second capacitor are discharged, the fourth diode is turned on, and a current flows through the drain of the first switching tube via the first capacitor and is transmitted to one end of the primary winding to form a current loop; and a primary side current flows, one end of the first secondary winding flows to the third capacitor, and the current flows to the anode of the fourth diode through the third capacitor and is transmitted to the other end of the first secondary winding from the cathode of the fourth diode.
With reference to the first aspect of the embodiment of the present application, in another possible implementation manner of the first aspect of the embodiment of the present application, when the first switching tube is turned off and the second switching tube is turned on, a current flows through a drain of the second switching tube through one end of the primary winding, and is transferred to the fourth capacitor, so as to form a current loop; and a primary side current flows from one end of the second secondary winding to the third capacitor, then flows to the anode of the fifth diode, and is transmitted from the cathode of the fifth diode to the other end of the second secondary winding.
With reference to the first aspect of the embodiment of the present application, in another possible implementation manner of the first aspect of the embodiment of the present application, when the first switching tube is turned off and the second switching tube is turned off, the first capacitor and the second capacitor are charged, a current is transferred to an anode of the first diode and an anode of the third diode through one end of the primary winding, transferred to the second capacitor through the third diode, and transferred to the first capacitor through the first diode, so as to form a current loop; and a primary side current flows through the first secondary winding, flows to the third capacitor through one end of the second secondary winding, flows to the anode of the fifth diode through the third capacitor, and is transmitted to the other end of the second secondary winding from the cathode of the fifth diode to form a current loop.
A second aspect of the present application provides a switching power supply apparatus including the active clamp circuit according to the first aspect.
A third aspect of the present application provides an in-vehicle apparatus including the switching power supply device according to the second aspect.
The embodiment of the application has the following beneficial effects:
in the application, an active clamping circuit is provided, which comprises an input circuit, a transformer and an output circuit, wherein the input circuit comprises a clamping circuit module and an absorption circuit module, and the transformer comprises a primary winding and a secondary winding; the input circuit is connected with the output circuit through the transformer; the clamping circuit module and the absorption circuit module are connected with the primary winding, and the secondary winding is connected with the output circuit; the input circuit is used for being externally connected with the input power supply through the positive port and the negative port, the output circuit is connected with a load, the clamping circuit module is used for fixing the voltage peak value of the input power supply on a preset voltage value, and the absorption circuit module is used for inhibiting the peak voltage of the clamping circuit module. Therefore, the peak voltage suppression circuit has the advantages that a common peak voltage suppression circuit is expanded, the absorption of the peak voltage is optimized by changing the discharge loop of the absorption capacitor, the peak voltage of a silicon carbide device is effectively suppressed, the electromagnetic interference is reduced, and the switching loss of a main switching tube caused by large capacitance is avoided. The problem of in the traditional approach spike voltage can not be absorbed fast to and lead to EMI to disturb and enlarge, influence the reliability of power even 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 technical solutions in the prior art, the drawings needed to be used in the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Reference will now be made in brief to the accompanying drawings, which are referred to in the embodiments of the present application.
FIG. 1 is a schematic diagram of an active clamp circuit;
fig. 2 is a schematic circuit diagram of an active clamp circuit provided in an embodiment of the present application;
fig. 3A is a schematic diagram of a first state of an active clamp circuit provided in an embodiment of the present application;
fig. 3B is a schematic diagram of a second state of an active clamp circuit provided in an embodiment of the present application;
fig. 3C is a third state schematic diagram of an active clamp circuit provided in an embodiment of the present application;
fig. 4 is a circuit block diagram of an active clamp circuit provided in an embodiment of the present application;
fig. 5 is a schematic structural diagram of an input circuit of an active clamp circuit provided in an embodiment of the present application;
fig. 6 is a schematic structural diagram of a transformer of an active clamp circuit provided in an embodiment of the present application;
fig. 7 is a schematic structural diagram of an output circuit of an active clamp circuit according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical solutions of the present application better understood, 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, 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.
In a common solution for suppressing the spike voltage, a capacitor is connected in parallel between the drain and the source of the main switch tube. The method has some problems that if the capacitance is small, the absorption effect is not obvious, and if the capacitance is large, the switching loss of the main switching tube can be caused. For example, in the active clamp circuit shown in fig. 1, when the circuit is turned off, the voltage spike energy generated in the previous working cycle still exists in the clamp capacitor C2, and the current spike energy cannot be discharged; when the power supply is started again, the Q1 is firstly switched on and then switched off, after the Q1 is switched off, the C2 and the C4 continue to absorb peak voltage generated by leakage inductance of the transformer, the voltage at the two ends of the C4 is higher than clamping voltage during normal operation, the Q2 is switched on, the C4 discharges through the Q2, at the moment, the discharging current is higher than current during normal operation, larger surge current impact is generated on the Q2, and overcurrent damage of the Q2 can be caused in serious cases. According to the scheme, for a large-current switch loop, high instantaneous peak voltage can be generated due to too fast current change, and the response speed of the clamping circuit cannot be met due to the circuit structure and the like. At the moment when the main switching tube is turned off, the peak voltage cannot be absorbed quickly, so that not only can the EMI interference be increased, but also the reliability of the power supply is influenced.
In view of the above problems, an active clamp circuit and related devices are provided in the embodiments of the present application, which are described below with reference to the accompanying drawings.
Referring to fig. 2, fig. 2 is a schematic circuit structure diagram of an active clamp circuit provided in an embodiment of the present application, where the active clamp circuit 200 includes an input circuit 210, a transformer 220, and an output circuit 230, the input circuit 210 includes a clamp circuit module 211 and an absorption circuit module 212, the transformer 220 includes a primary winding N1 and a secondary winding N2;
the input circuit 210 and the output circuit 230 are connected through the transformer 220;
the clamping circuit module 211 and the absorption circuit module 212 are connected to the primary winding N1, and the secondary winding N2 is connected to the output circuit 230;
the input circuit 210 is configured to externally connect the input power source through the positive port (HV +) and the negative port (HV-), the output circuit is configured to connect a load, the clamp circuit module 211 is configured to fix a voltage peak of the input power source at a preset voltage value, and the absorption circuit module 212 is configured to suppress a spike voltage of the clamp circuit module 211.
Therefore, in the example, a common peak voltage suppression circuit is expanded, the absorption of the peak voltage is optimized by changing a discharge loop of an absorption capacitor, the peak voltage of a silicon carbide device is effectively suppressed, the electromagnetic interference is reduced, and the switching loss of a main switching tube caused by large capacitance is avoided. The problem of in the traditional approach spike voltage can not be absorbed fast to and lead to EMI to disturb and enlarge, influence the reliability of power even is solved.
As a possible implementation, the clamping circuit module 211 includes a first capacitor C1, a first switch tube Q1, a second switch tube Q2, a first diode D1, and a second diode D2, the first capacitor C1 includes a first clamping capacitor, the first switch tube Q1 includes a first clamping switch tube, and the second switch tube Q2 includes a second clamping switch tube;
the positive electrode port of the input circuit 210 is connected to the positive electrode of the first capacitor C1 and one end of the transformer primary winding N1, the negative electrode of the first capacitor C1 is connected to the drain of the first switch tube Q1 and the negative electrode of the first diode D1, the source of the first switch tube Q1 is connected to the drain of the second switch tube Q2 and the positive electrode of the first diode D1, the other end of the transformer primary winding N1 is connected to the drain of the second switch tube Q2 and one end of the snubber circuit module 212, and the source of the second switch tube Q2 is connected to the positive electrode of the second diode D2, the other end of the snubber circuit module 212 and the negative electrode port of the input circuit 230.
The first diode D1 and the second diode D2 are parasitic body diodes of the first switch tube Q1 and the second switch tube Q2, respectively.
The active clamping circuit is suitable for an active clamping forward circuit, an active clamping flyback circuit and an active clamping forward and flyback circuit.
Therefore, in the example, the clamping circuit module is added in 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; the clamping circuit module is favorable for fixing the voltage to the specified voltage, the stability of the output voltage is favorable for ensuring, and the clamping switch tube is prevented from being impacted by surge current and damaged.
As a possible implementation, the snubber circuit module 212 includes a second capacitor C2 and a third diode D3, and the second capacitor C2 includes a second clamping capacitor;
the anode of the third diode D3 is connected to the other end of the primary winding N1 of the transformer, the cathode of the third diode D3 is connected to the anode of the second capacitor C2, the cathode of the first diode D1 and the drain of the first switch Q1, and the cathode of the second capacitor C2 is connected to the source of the second switch Q2, the anode of the second diode D2 and the cathode port of the input circuit 210.
In this example, the third diode connected in series to the second clamping capacitor releases energy in the clamping capacitor when the power supply is turned off, which is beneficial to avoiding surge current impact on the clamping switch tube and damage to the clamping switch tube.
As a possible implementation, the output circuit 230 includes a third capacitor C3, a fourth diode D4, and a fifth diode D5;
the positive electrode port of the output circuit 230 is connected with the positive electrode of the third capacitor C3, one end of the first secondary winding n2 and one end of the second secondary winding n 3; the cathode port of the output circuit 230 is connected to the cathode of the third capacitor C3, the anode of the fourth diode D4, and the anode of the fifth diode D5, the cathode of the fourth diode D4 is connected to the other end of the first secondary winding n2, and the cathode of the fifth diode D5 is connected to the other end of the second secondary winding n 3.
In this example, the output circuit includes a third capacitor, a fourth diode and a fifth diode, and different current flow directions are generated according to the closing modes of the first switch tube and the second switch tube, which is beneficial to improving the efficiency of the active clamp circuit.
As a possible implementation, the input circuit 210 further includes a fourth capacitor C4;
the anode of the fourth capacitor C4 is connected to the anode port of the input circuit, and the cathode of the fourth capacitor C4 is connected to the cathode port of the input circuit.
The active clamp circuit provided in the embodiments of the present application includes three states, specifically as follows:
as a possible implementation manner, in the first state as shown in fig. 3A, when the first switching tube Q1 is turned on and the second switching tube Q2 is turned off, the first capacitor C1 and the second capacitor C2 discharge, the fourth diode D4 is turned on, and a current flows through the drain of the first switching tube Q1 via the first capacitor C1 and is transferred to one end of the primary winding N1 to form a current loop; a primary current flows, one end of the first secondary winding n2 flows to the third capacitor C3, and a current flows to the anode of the fourth diode D4 through the third capacitor C3 and is transferred from the cathode of the fourth diode D4 to the other end of the first secondary winding n 2.
As a possible implementation manner, in the second state as shown in fig. 3B, when the first switching tube Q1 is turned off and the second switching tube Q2 is turned on, a current flows through the drain of the second switching tube Q2 through one end of the primary winding N1, and is transferred to the fourth capacitor C4, so as to form a current loop; a primary current flows from one end of the second secondary winding n3 to the third capacitor C3, then to the anode of the fifth diode D5, and then from the cathode of the fifth diode D5 to the other end of the second secondary winding n 3.
As a possible implementation manner, in the third state as shown in fig. 3C, when the first switch Q1 is turned off and the second switch Q2 is turned off, the first capacitor C1 and the second capacitor C2 are charged, and the current is transferred to the positive electrode of the first diode D1 and the positive electrode of the third diode D3 through one end of the primary winding N1, transferred to the second capacitor C2 through the third diode D3, and transferred to the first capacitor C1 through the first diode D1, so as to form a current loop; a primary current flows through, flows to the third capacitor C3 through one end of the second secondary winding n3, flows to the anode of the fifth diode D5 through the third capacitor C3, and is transmitted from the cathode of the fifth diode D5 to the other end of the second secondary winding n3, so that a current loop is formed.
Referring to fig. 4, fig. 4 is a circuit block diagram of an active clamp circuit provided in an embodiment of the present application, where the active clamp circuit 400 includes an input circuit 410, a transformer 420, and an output circuit 430, the input circuit 410 includes a clamp circuit module 411 and an absorption circuit module 412, and the transformer includes a primary winding 421 and a secondary winding 422;
optionally, the input circuit 410 and the output circuit 430 are connected through the transformer 420;
optionally, the clamping circuit module 411 and the absorption circuit module 412 are connected to the primary winding 421, and the secondary winding 422 is connected to the output circuit 430;
the input circuit 410 is configured to externally connect the input power source through the positive port (HV +) and the negative port (HV-), the output circuit is configured to connect to a load, the clamp circuit module 411 is configured to fix a voltage peak of the input power source at a preset voltage value, and the absorption circuit module 412 is configured to suppress a spike voltage of the clamp circuit module 411.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an input circuit of an active clamp circuit according to an embodiment of the present disclosure.
Optionally, the input circuit includes the first capacitor C1, the second capacitor C2, the fourth capacitor C4, the first switch tube Q1, the second switch tube Q2, the first diode D1, the second diode D2, and the third diode D3, wherein the first diode D1 and the second diode D2 are parasitic diodes.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a transformer of an active clamp circuit according to an embodiment of the present disclosure.
Optionally, the transformer includes the primary winding N1, the first secondary winding N2, the second secondary winding N3, and the steel core T1, wherein the first secondary winding N2 and the second secondary winding N3 are connected to the primary winding N1 through the steel core T1.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an output circuit of an active clamp circuit according to an embodiment of the present disclosure.
Optionally, the output circuit includes the fourth diode D4, the fifth diode D5, and the third capacitor C3, wherein a cathode of the fourth diode D4 and a cathode of the fifth diode D5 are connected to an anode of the third capacitor C3, and an anode of the fourth diode D4 and an anode of the fifth diode D5 are connected to a cathode of the third capacitor C3.
An embodiment of the present application further provides a switching power supply device, including the above active clamp circuit.
The embodiment of the application also provides vehicle-mounted equipment which comprises the switching power supply device.
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 embodiments and the application scope, and in view of the above, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
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 an absorption circuit module, and the transformer comprises a primary winding and a secondary winding;
the input circuit is connected with the output circuit through the transformer;
the clamping circuit module and the absorption circuit module are connected with the primary winding, and the secondary winding is connected with the output circuit;
the input circuit is used for being externally connected with the input power supply through the positive port and the negative port, the output circuit is connected with a load, the clamping circuit module is used for fixing the voltage peak value of the input power supply on a preset voltage value, and the absorption circuit module is used for inhibiting the peak voltage of the clamping circuit module.
2. The active clamp circuit of claim 1, wherein the clamp module comprises a first capacitor, a first switch transistor, a second switch transistor, a first diode, and a second diode, the first capacitor comprising a first clamp capacitor, the first switch transistor comprising a first clamp switch transistor, the second switch transistor comprising a second clamp switch transistor;
the positive port of the input circuit is connected with the positive electrode of the first capacitor and one end of the primary winding of the transformer, the negative electrode of the first capacitor is connected with the drain electrode of the first switching tube and the negative electrode of the first diode, the source electrode of the first switching tube is connected with the drain electrode of the second switching tube and the positive electrode of the first diode, the other end of the primary winding of the transformer is connected with the drain electrode of the second switching tube and one end of the absorption circuit module, and the source electrode of the second switching tube is connected with the positive electrode of the second diode, the other end of the absorption circuit module and the negative port of the input circuit.
3. The active clamp circuit of claim 2, wherein the snubber circuit module includes a second capacitor and a third diode, the second capacitor including a second clamp capacitor;
the anode of the third diode is connected with the other end of the primary winding, the cathode of the third diode is connected with the anode of the second capacitor, the cathode of the first diode and the drain of the first switch tube, and the cathode of the second capacitor is connected with the source of the second switch tube, the anode of the second diode and the cathode port of the input circuit.
4. The active clamp circuit of claim 1, wherein the output circuit comprises a third capacitor, a fourth diode, and a fifth diode;
the positive electrode port of the output circuit is connected with the positive electrode of the third capacitor, one end of the first secondary winding and one end of the second secondary winding; the negative pole port of the output circuit is connected with the negative pole of the third capacitor, the positive pole of the fourth diode and the positive pole of the fifth diode, the negative pole of the fourth diode is connected with the other end of the first secondary winding, and the negative pole of the fifth diode is connected with the other end of the second secondary winding.
5. The active clamp circuit of claim 1, wherein the input circuit further comprises a fourth capacitance;
and the anode of the fourth capacitor is connected with the anode port of the input circuit, and the cathode of the fourth capacitor is connected with the cathode port of the input circuit.
6. The active clamp circuit of claim 1, wherein when the first switch transistor is turned on and the second switch transistor is turned off, the first capacitor and the second capacitor are discharged, the fourth diode is turned on, and a current flows through the drain of the first switch transistor via the first capacitor and is transferred to one end of the primary winding to form a current loop; and a primary side current flows, one end of the first secondary winding flows to the third capacitor, and the current flows to the anode of the fourth diode through the third capacitor and is transmitted to the other end of the first secondary winding from the cathode of the fourth diode.
7. The active clamp circuit of claim 1, wherein when the first switching tube is turned off and the second switching tube is turned on, a current flows through a drain of the second switching tube through one end of the primary winding and is transferred to the fourth capacitor to form a current loop; and a primary side current flows from one end of the second secondary winding to the third capacitor, then flows to the anode of the fifth diode, and is transmitted from the cathode of the fifth diode to the other end of the second secondary winding.
8. The active clamp circuit of claim 1, wherein when the first switch is turned off and the second switch is turned off, the first capacitor and the second capacitor are charged, and current is transferred to the anode of the first diode and the anode of the third diode through one end of the primary winding, transferred to the second capacitor through the third diode, and transferred to the first capacitor through the first diode to form a current loop; and a primary side current flows through the first secondary winding, flows to the third capacitor through one end of the second secondary winding, flows to the anode of the fifth diode through the third capacitor, and is transmitted to the other end of the second secondary winding from the cathode of the fifth diode to form a current loop.
9. A switching power supply device characterized in that it comprises an active clamp circuit according to any one of claims 1 to 8.
10. An in-vehicle apparatus characterized by comprising the switching power supply device according to claim 9.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2020/115151 WO2022052127A1 (en) | 2020-09-14 | 2020-09-14 | Active clamping circuit and related device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113454896A true CN113454896A (en) | 2021-09-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080014577.1A Pending CN113454896A (en) | 2020-09-14 | 2020-09-14 | Active clamping circuit and related equipment |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113454896A (en) |
| WO (1) | WO2022052127A1 (en) |
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| CN105897000A (en) * | 2016-04-25 | 2016-08-24 | 陕西科技大学 | Phase shift compensation interleaved three-level LLC resonant converter |
| CN109167511A (en) * | 2018-11-05 | 2019-01-08 | 宁波市北仑临宇电子科技有限公司 | Lossless synchronous absorbing circuit, boosting and step-down switching power supply circuit |
| 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 |
| US20200091826A1 (en) * | 2018-09-18 | 2020-03-19 | Silergy Semiconductor Technology (Hangzhou) Ltd | Flyback converter, control circuit and control method thereof |
| CN213990502U (en) * | 2020-09-14 | 2021-08-17 | 深圳欣锐科技股份有限公司 | Active clamp circuit, switching power supply device and vehicle-mounted equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6317341B1 (en) * | 2000-11-09 | 2001-11-13 | Simon Fraidlin | Switching circuit, method of operation thereof and single stage power factor corrector employing the same |
| US6882548B1 (en) * | 2003-02-24 | 2005-04-19 | Tyco Electronics Power Systems, Inc. | Auxiliary active clamp circuit, a method of clamping a voltage of a rectifier switch and a power converter employing the circuit or method |
| JP2016158422A (en) * | 2015-02-25 | 2016-09-01 | 株式会社豊田自動織機 | Forward type dc-dc converter circuit |
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2020
- 2020-09-14 WO PCT/CN2020/115151 patent/WO2022052127A1/en active Application Filing
- 2020-09-14 CN CN202080014577.1A patent/CN113454896A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105897000A (en) * | 2016-04-25 | 2016-08-24 | 陕西科技大学 | Phase shift compensation interleaved three-level LLC resonant converter |
| US20200091826A1 (en) * | 2018-09-18 | 2020-03-19 | Silergy Semiconductor Technology (Hangzhou) Ltd | Flyback converter, control circuit and control method thereof |
| CN109167511A (en) * | 2018-11-05 | 2019-01-08 | 宁波市北仑临宇电子科技有限公司 | Lossless synchronous absorbing circuit, boosting and step-down switching power supply circuit |
| 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 |
| CN213990502U (en) * | 2020-09-14 | 2021-08-17 | 深圳欣锐科技股份有限公司 | Active clamp circuit, switching power supply device and vehicle-mounted equipment |
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| Publication number | Publication date |
|---|---|
| WO2022052127A1 (en) | 2022-03-17 |
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