CN110199465B - Synchronous rectification circuit and rectification device - Google Patents
Synchronous rectification circuit and rectification device Download PDFInfo
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- CN110199465B CN110199465B CN201880006894.1A CN201880006894A CN110199465B CN 110199465 B CN110199465 B CN 110199465B CN 201880006894 A CN201880006894 A CN 201880006894A CN 110199465 B CN110199465 B CN 110199465B
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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Abstract
A synchronous rectification circuit and a rectification device, the synchronous rectification circuit comprising a transformer (T1), a first rectification circuit (210), a second rectification circuit (220), a positive power output terminal (Vout +) and a negative power output terminal (Vout-), wherein: the transformer (T1) comprises a primary winding (LO), a first secondary winding (L1) and a second secondary winding (L2); a first end (L11) of the first secondary winding (L1) is connected with a first input end (211) of the first rectifying circuit (210), and a second end (L12) of the first secondary winding (L1) is connected with a second input end (212) of the first rectifying circuit (210), a second input end (222) of the second rectifying circuit (220), a first end (L21) of the second secondary winding (L2) and the power output negative end (Vout-); a second end (L22) of the second secondary winding (L2) is connected to a first input (221) of the second rectifying circuit (220); the output end (213) of the first rectifying circuit (210) is connected with the output end (223) of the second rectifying circuit (220) and the positive power output end (Vout-); an extra power supply winding does not need to be arranged on the transformer (T1), so that the processing cost of the transformer is reduced, the PCB wiring is facilitated, and the power density of a power supply is improved.
Description
Technical Field
The application relates to the technical field of electronics, in particular to a synchronous rectification circuit and a rectification device.
Background
A Rectifying Circuit (Rectifying Circuit) is a Circuit that converts ac power into dc power. Most of the rectifier circuits are composed of a transformer, a main rectifier circuit, a filter and the like. It is widely applied in the fields of speed regulation of direct current motors, excitation regulation of generators, electrolysis, electroplating and the like. The rectifier circuit is generally composed of a main circuit, a filter, and a transformer.
For the application of the rectifier circuit, the synchronous rectifier circuit belongs to a relatively preferable circuit, as shown in fig. 1. The conventional power supply mode is that an additional power supply winding is added on the transformer to supply power for the rectifying circuit, the circuit is complex, and the winding difficulty and cost of the transformer are increased. When a Printed Circuit Board (PCB) is mounted, more PCB space is required, which is not favorable for increasing power density of the power supply.
Disclosure of Invention
In order to solve the problems occurring in the synchronous rectification circuit, the application provides the synchronous rectification circuit and the rectification device, the rectification circuit can obtain alternating current for rectification through grounding, a power supply winding is omitted, the PCB wiring is facilitated, and the power density of a power supply is improved.
In a first aspect of the embodiments of the present application, a synchronous rectification circuit is provided, which is applied to positive rectification, and includes a transformer, a first rectification circuit, a second rectification circuit, a power output positive terminal and a power output negative terminal, wherein:
the transformer comprises a primary winding, a first secondary winding and a second secondary winding; the first end of the first secondary winding is connected with the first input end of the first rectifying circuit, and the second end of the first secondary winding is connected with the second input end of the first rectifying circuit, the second input end of the second rectifying circuit, the first end of the second secondary winding and the negative output end of the power supply; the second end of the second secondary winding is connected with the first input end of the second rectifying circuit; the output end of the first rectifying circuit is connected with the output end of the second rectifying circuit and the positive output end of the power supply;
when the polarity of the first end of the first secondary winding is positive and the polarity of the second end of the first secondary winding is negative, the first rectifying circuit realizes a rectifying function;
and when the polarity of the first end of the first secondary winding is negative and the polarity of the second end of the first secondary winding is positive, the second rectifying circuit realizes a rectifying function.
In one embodiment, the first rectification circuit includes: the power supply comprises a first power supply control chip, a first switch tube, a first diode, a first resistor and a first capacitor;
the second input end of the first rectifying circuit is connected with the anode of the first diode, the cathode of the first diode is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the first capacitor and the power supply end of the first power supply control chip, and the control end of the first power supply control chip is connected with the first end of the first switching tube; the first input end of the first rectifying circuit is connected with the second end of the first capacitor, the grounding end of the first power supply control chip and the second end of the first switching tube, and the third end of the first switching tube is connected with the output end of the first rectifying circuit.
In one embodiment, the second rectification circuit includes: the second power control chip, a second switching tube, a second diode, a second resistor and a second capacitor;
a second input end of the second rectifying circuit is connected with an anode of the second diode, a cathode of the second diode is connected with a first end of the second resistor, a second end of the second resistor is connected with a first end of the second capacitor and a power supply end of a second power supply control chip, and a control end of the second power supply control chip is connected with a first end of the second switching tube; the second input end of the second rectifying circuit is connected with the second end of the second capacitor, the grounding end of the second power supply control chip and the second end of the second switching tube, and the third end of the second switching tube is connected with the output end of the second rectifying circuit.
In one embodiment, when the polarity of the first input terminal of the first rectifying circuit is positive and the polarity of the second input terminal of the first rectifying circuit is negative, the first diode is not conducted, the first power chip drives the first switching tube to complete rectification, at this time, the polarity of the first input terminal of the second rectifying circuit is negative, the polarity of the second input terminal of the second rectifying circuit is positive, the second diode is conducted, the voltage between the first end and the second end of the second winding passes through the second diode and the second resistor to charge the second capacitor, and the function of storing electric energy by the second capacitor includes providing energy for the second power control chip.
In one embodiment, when the polarity of the first input terminal of the first rectifying circuit is negative and the polarity of the second input terminal of the first rectifying circuit is positive, the first diode is turned on, the voltage between the first terminal and the second terminal of the first winding passes through the first diode and the first resistor to charge the first capacitor, the function of the first capacitor for storing electric energy includes providing energy for the first power control chip, at this time, the polarity of the first input terminal of the second rectifying circuit is positive, the polarity of the second input terminal of the second rectifying circuit is negative, the second diode is not turned on, and the second power chip drives the second switching tube to complete rectification.
In one embodiment, the first and second switching tubes comprise metal oxide semiconductor field effect transistors MOSFETs.
In one embodiment, the drain of the MOSFET is connected to the positive power output terminal.
In one embodiment, the synchronous rectification circuit further comprises: and the filter circuit is positioned between the positive power output terminal and the negative power output terminal.
In one embodiment, the filter circuit comprises two filter capacitors connected in parallel.
In a second aspect of the embodiments of the present application, a rectifying device is provided, which includes the synchronous rectifying circuit described in the first aspect of the embodiments of the present application.
The embodiment of the application provides a synchronous rectification circuit, including transformer, first rectifier circuit, second rectifier circuit, power output positive terminal and power output negative terminal, wherein the earthing terminal of first rectifier circuit and second rectifier circuit is connected with the first winding and the second winding of transformer respectively, need not set up extra power supply winding on the transformer, reduces transformer processing cost. For the occasion that the rectifying circuit and the transformer need to be separately arranged, the power supply winding is omitted, the PCB wiring is facilitated, and the power density of the power supply is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are 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.
FIG. 1 is a schematic diagram of a prior art synchronous rectification circuit;
FIG. 2 is a schematic diagram of a synchronous rectification circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a specific structure of a synchronous rectification circuit in an embodiment of the present application;
FIG. 4 is a schematic diagram of another embodiment of a synchronous rectification circuit according to the present application;
fig. 5 is a graph comparing voltage waveform changes in the examples of the present application.
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 a part of the embodiments of the present application, and not all of the 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 terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular 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 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.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a synchronous rectification circuit according to an embodiment of the present disclosure.
The application provides a synchronous rectification circuit, which comprises a transformer T1, a first rectification circuit 210, a second rectification circuit 220, a power output positive terminal Vout +, a power output negative terminal Vout-;
the transformer T1 includes a primary winding L0, a first secondary winding L1 and a second secondary winding L2, wherein a first end L11 of the first secondary winding L1 is connected to the first input end 211 of the first rectifier circuit 210, a second end L12 of the first secondary winding L1 is connected to the second input end 212 of the first rectifier circuit 210, the second input end 222 of the second rectifier circuit 220 and the power output negative end Vout-, a second end L22 of the second secondary winding L2 is connected to the first input end 221 of the second rectifier circuit 220, and a second end L22 of the first secondary winding L1 and a first end L21 of the second secondary winding L2 are connected to the same port. The output end 213 of the first rectifying circuit 210 is connected to the output end 223 of the second rectifying circuit 220 and the positive power output terminal Vout +.
Through above-mentioned connected mode, first rectifier circuit and second rectifier circuit are through direct ground connection, directly get the electric rectification through the transformer promptly, can needn't set up extra power supply winding on the transformer and supply power for first rectifier circuit and second rectifier circuit, reduce transformer processing cost, more do benefit to the PCB wiring, improve power density.
In one embodiment, as shown in fig. 3, the first rectifying circuit 210 shown in fig. 3 includes a first power control chip 310, a first switching tube Q1, a first diode D1, a first resistor R1, and a first capacitor EC 1; the first switching tube Q1 may be a transistor or a MOSFET tube. The first switch Q1 is a MOSFET transistor for example.
Optionally, the second end L12 of the first secondary winding L1 is connected to the positive electrode of the first diode D1, the negative electrode of the first diode D1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to one end of the first capacitor EC1 and a power supply end (VCC) of the first power control chip 310, and the control end of the first power control chip 310 is connected to the gate G of the first switching tube Q1; a first end L11 of the first secondary winding L1 is connected to the other end of the first capacitor EC1, a Ground (GND) of the first power control chip 310, and a source S of the first switching tube Q1, and a drain D of the first switching tube Q1 is connected to the power output positive terminal Vout +.
In one embodiment, as shown in fig. 3, the second rectifying circuit 220 includes a second power control chip 320, a second switching tube Q2, a second diode D2, a second resistor R2, and a second capacitor EC 2; the second switching tube Q2 may be a transistor or a MOSFET tube. The second switching transistor Q2 will be described as a MOSFET transistor.
Optionally, the first end L21 of the second secondary winding L2 is connected to the positive electrode of the second diode D2, the negative electrode of the second diode D2 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to one end of the second capacitor EC2 and the power supply terminal VCC of the second power control chip 320, and the control terminal of the second power control chip 320 is connected to the gate G of the second switching tube Q2; the second terminal L22 of the second secondary winding L2 is connected to the other terminal of the second capacitor EC2, the ground GND of the second power control chip 320, and the source S of the second switching transistor Q2, and the drain D of the second switching transistor Q2 is connected to the negative power output terminal Vout-.
The MOSFET with extremely low on-state resistance is used as a switching tube, so that the loss of a rectifying circuit can be greatly reduced, the efficiency of the DC/DC converter is improved, and the requirements of a low-voltage and high-current rectifier are met.
Optionally, as shown in fig. 4, the synchronous rectification circuit provided in this embodiment of the present application may further include a filter circuit 230, where the filter circuit 230 is connected between the positive power output terminal Vout + and the negative power output terminal Vout-.
The rectified pulsating dc current can be converted into a smoother dc current by operation of the filter circuit 230.
The operation principle of the synchronous rectification circuit provided by the present application will be described below with reference to fig. 2 to 4.
When the voltage polarity of the first secondary winding L1 of the transformer is positive, negative, the voltage of the first end L11 of the first secondary winding L1 is positive, the voltage of the second end L12 of the first secondary winding L1 is negative, the voltage of the first input end 211 of the first rectification circuit 210 is positive, the voltage of the second input end 212 is negative, it can be known that the voltage of the positive electrode of the first diode D1 is negative, the voltage of the negative electrode of the first diode D1 is positive, the first diode D1 is in a non-conducting state, and the control end of the first power control chip 310 of the first rectification circuit 210 sends a driving signal to the gate G of the first switch tube Q1, so as to implement a synchronous rectification function; at this time, the voltage polarity of the second secondary winding L2 of the transformer is also positive, negative, and the voltage at the first end of the second secondary winding L2 is positive, the voltage at the second end of the second secondary winding L2 is negative, the voltage at the first input end 221 of the second rectification circuit 220 is negative, the voltage at the second input end 222 is positive, it can be understood that the voltage at the positive end of the second diode D2 is positive, the voltage at the negative end of the second diode D2 is negative, the second diode D2 is in a conducting state, the voltage passes through the second diode D2 and the second resistor R2 to charge the second capacitor EC2, the second capacitor EC2 stores electric energy, and releases energy when the voltage polarity is reversed, so as to provide electric energy for the second power control chip 320 to drive the second switching tube Q2.
The driving signal may be a Pulse Width Modulation (PWM) signal, and the first power control chip 310 may send the PWM signal to the gate G of the first switching tube Q1 through the control end to adjust the voltage output by the first rectifying circuit 210. The magnitude of the voltage output by the first rectifying circuit 210 is proportional to the duty ratio of the PWM signal.
When the voltage polarity of the first secondary winding L1 of the transformer is positive, the voltage at the first end L11 of the first secondary winding L1 is negative, the voltage at the second end L12 of the first secondary winding L1 is positive, at this time, the voltage at the first input end 211 of the first rectifying circuit 210 is negative, the voltage at the second input end 212 is positive, the voltage at the positive electrode of the first diode D1 is positive, the voltage at the negative electrode of the first diode D1 is negative, the first diode D1 is in a conducting state, the voltage passes through the first diode D1 and the first resistor R1 to charge the first capacitor EC1, the first capacitor EC1 stores electric energy, and releases the energy when the voltage polarity is reversed, so as to provide the electric energy for the first power control chip 310 to drive the first switching tube Q1. At this time, the voltage polarity of the second secondary winding L2 of the transformer is also negative, positive, and the voltage at the first end L21 of the second secondary winding L2 is negative, the voltage at the second end L22 of the second secondary winding L2 is positive, the voltage at the first input end 221 of the second rectification circuit 220 is positive, and the voltage at the second input end 222 is negative, it can be understood that the voltage at the positive electrode of the second diode D2 is negative, the voltage at the negative electrode of the second diode D2 is positive, the second diode D2 is in a non-conducting state, and the control end of the second power control chip 320 of the second rectification circuit 220 sends a driving signal to the gate G of the second switching tube Q2, so as to implement a synchronous rectification function.
The driving signal may be a Pulse Width Modulation (PWM) signal, and the second power control chip 320 may send the PWM signal to the gate G of the second switching tube Q2 through the control end to adjust the voltage output by the second rectifying circuit 220. The magnitude of the voltage output by the first rectifying circuit 220 is proportional to the duty ratio of the PWM signal.
When the first rectifying circuit 210 is rectifying, the second rectifying circuit 220 is charged through the second capacitor EC 2; when the voltage polarity is reversed and the second rectifying circuit 220 rectifies, the first rectifying circuit 210 is charged through the first capacitor EC1, wherein the second rectifying circuit 220 obtains the electric energy for driving the second switch tube Q2 by discharging through the second capacitor EC2, and the above steps can be sequentially performed alternately along with the periodic variation of the alternating voltage polarity.
Optionally, the pulsating direct current is processed by the filter circuit 230 after rectification, and the pulsating direct current is converted into a smoother direct current. The filter capacitor C1 and the filter capacitor C2 have polarities, one end of each filter capacitor is a positive electrode, the other end of each filter capacitor is a negative electrode, the positive electrode end of each filter capacitor is connected to the positive power output end, and the negative electrode of each filter capacitor is connected to the negative power output end.
Optionally, the filter capacitor may be a high-frequency filter capacitor, and is applied to filtering after rectification of the switching power supply, including an electrolytic capacitor. The capacitance is not the main index, and the standard for measuring the quality of the high-frequency electrolytic capacitor is the impedance-frequency characteristic. The requirement is to have a low equivalent impedance within the operating frequency of the switching power supply and to have a good filtering effect on high-frequency spike signals generated during the operation of the semiconductor device.
Specifically, the high-frequency electrolytic capacitor dedicated to the switching power supply has four terminals, and the positive terminal of the capacitor is respectively led out from two terminals of the positive electrode, and the negative terminal of the capacitor is also respectively led out from two terminals of the negative electrode. The current flows from one positive end of the four-terminal capacitor, passes through the inside of the capacitor and then flows to the load from the other positive end; the current returning from the load also flows from one negative terminal of the capacitor and then flows from the other negative terminal to the negative terminal of the power supply.
In all circuits which need to convert alternating current into direct current, the filter capacitor is arranged, so that the working performance of the electronic circuit is more stable, and meanwhile, the interference of alternating ripple waves to the electronic circuit is reduced. The filter capacitors are connected in parallel, so that the working efficiency of filtering can be improved.
As can be understood from fig. 5, the ac voltage waveform of the voltages at the first end of the first secondary winding and the second end of the second secondary winding of the transformer is square-wave shaped, and it can be understood that, when the ac voltage waveform is on the positive half axis of the Y axis, the voltage polarity corresponding to the voltage polarity of the first secondary winding and the second secondary winding is positive and negative (i.e., the first end of the first secondary winding and the first end of the second secondary winding are positive and the second end of the first secondary winding and the second end of the second secondary winding are negative), at this time, the first rectifying circuit rectifies the voltage between the first end and the second end of the first secondary winding, and simultaneously charges the second capacitor in the second rectifying circuit; when the alternating-current voltage waveform is on a Y-axis negative half shaft, the voltage polarity corresponding to the voltage polarity of the first secondary winding and the second secondary winding is up-negative-down-positive (namely, the second ends of the first secondary winding and the second secondary winding are positive, and the first ends of the first secondary winding and the second secondary winding are negative), at the moment, the second rectifying circuit rectifies the voltage between the first end and the second end of the first secondary winding, and simultaneously charges a first capacitor in the first rectifying circuit; after rectification, the voltage is filtered by a filter circuit, and then a smoother direct-current voltage waveform is presented.
Optionally, the synchronous rectification circuit provided by the application is not only suitable for a bridge circuit, but also suitable for other full-wave rectification circuits.
Compared with the existing synchronous rectification circuit, the synchronous rectification circuit provided by the embodiment of the application comprises a transformer, a first rectification circuit, a second rectification circuit, a power output positive end and a power output negative end, wherein grounding ends of the first rectification circuit and the second rectification circuit are respectively connected with a first winding and a second winding of the transformer, no extra power supply winding is required to be arranged on the transformer, and the processing cost of the transformer is reduced. For the occasion that the rectifying circuit and the transformer need to be separately arranged, the power supply winding is omitted, the PCB wiring is facilitated, and the power density of the power supply is improved.
The embodiment of the application also provides a rectifying device, which comprises the synchronous rectifying circuit, and the description is omitted here.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the core concepts of the present application; 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 summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (7)
1. A synchronous rectification circuit applied to positive rectification is characterized by comprising: the transformer, the first rectifying circuit, the second rectifying circuit, the power output positive end and the power output negative end;
the transformer comprises a primary winding, a first secondary winding and a second secondary winding; the first end of the first secondary winding is connected with the first input end of the first rectifying circuit, and the second end of the first secondary winding is connected with the second input end of the first rectifying circuit, the second input end of the second rectifying circuit, the first end of the second secondary winding and the negative output end of the power supply; the second end of the second secondary winding is connected with the first input end of the second rectifying circuit; the output end of the first rectifying circuit is connected with the output end of the second rectifying circuit and the positive output end of the power supply;
when the polarity of the first end of the first secondary winding is positive and the polarity of the second end of the first secondary winding is negative, the first rectifying circuit realizes a rectifying function;
the polarity of the first end of the first secondary winding is negative, the polarity of the second end of the first secondary winding is positive, and the second rectifying circuit achieves a rectifying function;
the first rectification circuit includes: the power supply comprises a first power supply control chip, a first switch tube, a first diode, a first resistor and a first capacitor;
the second input end of the first rectifying circuit is connected with the anode of the first diode, the cathode of the first diode is connected with the first end of the first resistor, the second end of the first resistor is connected with the first end of the first capacitor and the power supply end of the first power supply control chip, and the control end of the first power supply control chip is connected with the first end of the first switching tube; the first input end of the first rectifying circuit is connected with the second end of the first capacitor, the grounding end of the first power supply control chip and the second end of the first switching tube, and the third end of the first switching tube is connected with the output end of the first rectifying circuit;
the second rectification circuit includes: the second power control chip, a second switching tube, a second diode, a second resistor and a second capacitor;
a second input end of the second rectifying circuit is connected with an anode of the second diode, a cathode of the second diode is connected with a first end of the second resistor, a second end of the second resistor is connected with a first end of the second capacitor and a power supply end of a second power supply control chip, and a control end of the second power supply control chip is connected with a first end of the second switching tube; the first input end of the second rectifying circuit is connected with the second end of the second capacitor, the grounding end of the second power supply control chip and the second end of the second switching tube, and the third end of the second switching tube is connected with the output end of the second rectifying circuit;
the synchronous rectification circuit further includes: and the filter circuit is arranged between the positive power output terminal and the negative power output terminal.
2. The synchronous rectification circuit of claim 1, wherein when the polarity of the first input terminal of the first rectification circuit is positive and the polarity of the second input terminal of the first rectification circuit is negative, the first diode is not conducted, the first power control chip drives the first switch tube to complete rectification, and at this time, the polarity of the first input terminal of the second rectification circuit is negative, the polarity of the second input terminal of the second rectification circuit is positive, the second diode is conducted, the voltage between the first terminal of the second secondary winding and the second terminal of the second secondary winding passes through the second diode and the second resistor to charge the second capacitor, and the function of the second capacitor to store electric energy includes providing energy for the second power control chip.
3. The synchronous rectification circuit of claim 1 or 2, wherein when the polarity of the first input terminal of the first rectification circuit is negative and the polarity of the second input terminal of the first rectification circuit is positive, the first diode is turned on, the voltage between the first terminal of the first secondary winding and the second terminal of the first secondary winding passes through the first diode and the first resistor to charge the first capacitor, the function of the first capacitor to store the electric energy comprises providing energy to the first power control chip, when the polarity of the first input terminal of the second rectification circuit is positive, the polarity of the second input terminal of the second rectification circuit is negative, the second diode is not turned on, and the second power control chip drives the second switching tube to complete rectification.
4. The synchronous rectification circuit of claim 1, wherein the first and second switching transistors comprise Metal Oxide Semiconductor Field Effect Transistors (MOSFETs).
5. The synchronous rectification circuit of claim 4, wherein the drain of the MOSFET is connected to the positive power output terminal.
6. The synchronous rectification circuit of claim 1, wherein the filter circuit comprises two filter capacitors connected in parallel.
7. A rectifying apparatus comprising the synchronous rectification circuit according to any one of claims 1 to 6.
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|---|---|---|---|
| PCT/CN2018/109109 WO2020062247A1 (en) | 2018-09-30 | 2018-09-30 | Synchronous rectifier circuit and rectifier device |
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| CN110199465A CN110199465A (en) | 2019-09-03 |
| CN110199465B true CN110199465B (en) | 2021-07-13 |
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| DE102020119598A1 (en) | 2020-07-24 | 2022-01-27 | Universität Stuttgart | Circuit arrangement with an active rectifier circuit and its application in a synchronous machine |
| CN112415255B (en) * | 2020-11-14 | 2023-10-24 | 陕西航空电气有限责任公司 | Improved active current sampling circuit |
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| CN2865161Y (en) * | 2005-12-19 | 2007-01-31 | 海信集团有限公司 | Special TV set circuit for hotel |
| JP5076997B2 (en) * | 2008-03-19 | 2012-11-21 | 株式会社村田製作所 | Isolated DC-DC converter |
| US9236809B2 (en) * | 2013-10-16 | 2016-01-12 | Texas Instruments Incorporated | Automatic timing adjustment for synchronous rectifier circuit |
-
2018
- 2018-09-30 WO PCT/CN2018/109109 patent/WO2020062247A1/en active Application Filing
- 2018-09-30 CN CN201880006894.1A patent/CN110199465B/en active Active
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|---|---|---|---|---|
| JPH07337005A (en) * | 1994-06-03 | 1995-12-22 | Hitachi Ltd | Dc/dc converter and power supply |
| CN1350718A (en) * | 1999-03-12 | 2002-05-22 | 艾利森公司 | Clamping circuit and method for synchrouous rectification |
| CN101997413A (en) * | 2009-08-12 | 2011-03-30 | 台达电子工业股份有限公司 | Power supply converter with synchronous rectifier and control method for synchronous rectifier |
| CN202586786U (en) * | 2012-05-15 | 2012-12-05 | 东华大学 | Synchronous rectification circuit based on synchronous rectification chip low-voltage-output push-pull converter |
| CN107257203A (en) * | 2017-08-21 | 2017-10-17 | 东莞市紫能电子科技有限公司 | A kind of fairing |
| CN209016940U (en) * | 2018-09-30 | 2019-06-21 | 深圳欣锐科技股份有限公司 | Circuit of synchronous rectification and fairing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110199465A (en) | 2019-09-03 |
| WO2020062247A1 (en) | 2020-04-02 |
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