CN212381124U - General type analog synchronous rectification circuit - Google Patents
General type analog synchronous rectification circuit Download PDFInfo
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- CN212381124U CN212381124U CN202021219795.2U CN202021219795U CN212381124U CN 212381124 U CN212381124 U CN 212381124U CN 202021219795 U CN202021219795 U CN 202021219795U CN 212381124 U CN212381124 U CN 212381124U
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- transistor
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- effect transistor
- power supply
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a synchronous rectifier circuit of general type simulation, the projecting pole including third transistor Q3 passes through first diode D1, second resistance R2 and is connected with field effect transistor Q9's source electrode, the projecting pole of fourth transistor Q4 passes through second diode D2, third resistance R3 and is connected with field effect transistor Q9's drain electrode; after the emitter of the first transistor Q1 is connected to the emitter of the second transistor Q2, the gate of the field effect transistor Q9 is connected; the collector of the first transistor Q1 is connected with the positive pole VCC of the synchronous power supply, and the collector of the second transistor Q2 is connected with the negative pole of the synchronous power supply. The utility model discloses an analog circuit that uses conventional electron device to build realizes synchronous rectification function, can use in the various topological circuit of low pressure heavy current, has reduced the purchase cost of product, has shortened the purchase cycle, has improved the commonality and the delivery capacity of product greatly, possesses very high price/performance ratio.
Description
Technical Field
The utility model relates to a power technical field especially relates to a synchronous rectifier circuit is imitated to general type.
Background
The switching power supply of the synchronous rectification architecture on the market generally adopts a special synchronous rectification integrated circuit to realize synchronous triggering of a power field effect transistor, as shown in fig. 1, the integrated circuit U1 is used for monitoring the potential difference between two ends of a field effect transistor Q9, and the power field effect transistor Q9 is switched on or off in real time to achieve the purpose of rectification, but the circuit has the following problems:
firstly, a synchronous rectification integrated circuit is adopted for control, so that the cost is high, and the purchase period is long;
and secondly, because the primary side working modes of the switching power supply are different and are divided into a flyback mode, a forward mode and an LLC resonance mode, different synchronous rectification control integrated circuits are required to be adopted, and the universality is not strong.
In view of the above, it is urgent to develop a synchronous rectification circuit applicable to various power supply topologies and having a wider power range.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that the prior synchronous rectification switch power supply needs to adopt different synchronous rectification control integrated circuits, and has poor universality; the problem that the purchasing of components is time-consuming is solved by providing a universal analog synchronous rectification circuit, so that the requirements that people shorten the production period of products and the components are easy to purchase are met.
In order to achieve the purpose, the utility model adopts the following technical proposal:
implementing a general-purpose analog synchronous rectification circuit, said circuit comprising:
the emitter of the third transistor is connected with the source electrode of a field effect transistor through a first diode and a second resistor, and the emitter of the fourth transistor is connected with the drain electrode of the field effect transistor through a second diode and a third resistor;
the base electrode of the third transistor is connected with the collector electrode of the fourth transistor and then connected with the positive electrode VCC of the synchronous power supply through a fourth resistor, and the connection point of the fourth resistor is also connected with the base electrode of the fourth transistor;
the connection point of the fourth resistor is also connected with the base electrode of the first transistor, the base electrode of the second transistor and the collector electrode of the third transistor through a third diode, and then is connected with the positive electrode of the synchronous power supply through a fifth resistor;
after the emitter of the first transistor is connected with the emitter of the second transistor, the grid of the field effect transistor is connected;
and the collector electrode of the first transistor is connected with the positive electrode of the synchronous power supply, and the collector electrode of the second transistor is connected with the negative electrode of the synchronous power supply.
The first diode, the second diode and the third diode are all fast recovery diodes.
And the cathode of the second diode is connected with the drain electrode of the field effect transistor.
The cathode of the first diode is connected with the source electrode of the field effect transistor.
The field effect transistor is of an N-channel type.
The utility model has the advantages that: the utility model discloses an analog circuit that uses conventional electron device to build realizes synchronous rectification function, can use in the various topological circuit of low pressure heavy current, has reduced the purchase cost of product, has shortened the purchase cycle, has improved the commonality and the delivery capacity of product greatly, possesses very high price/performance ratio.
Drawings
FIG. 1 is an electrical schematic diagram of a synchronous circuit triggered FET rectification implemented by an integrated circuit to which a prior art synchronous rectification circuit is directed;
fig. 2 is an electrical schematic diagram of the rectification of the field effect transistor triggered by the synchronous circuit constructed by the general analog synchronous rectification circuit of the present invention.
Detailed Description
The technical solution of the present invention will be further explained by the best mode in the following with reference to the accompanying drawings.
As shown in fig. 2, the analog synchronous rectification circuit of the general type is implemented, including:
a PNP third transistor Q3 and an NPN fourth transistor Q4, the emitter of the third transistor Q3 is connected to the source of the field effect transistor Q9 through a first diode D1 and a second resistor R2, and the emitter of the fourth transistor Q4 is connected to the drain of the field effect transistor Q9 through a second diode D2 and a third resistor R3;
the base electrode of the third transistor Q3 is connected with the collector electrode of the fourth transistor Q4 and then connected with the positive electrode VCC of the synchronous power supply through a fourth resistor R4, and the connection point of the fourth resistor R4 is also connected with the base electrode of the fourth transistor Q4;
the connection point of the fourth resistor R4 is further connected to the base of the first transistor Q1, the base of the second transistor Q2, the collector of the third transistor Q3 through a third diode D3, and then connected to the positive electrode VCC of the synchronous power supply through a fifth resistor R5;
after the emitter of the first transistor Q1 is connected with the emitter of the second transistor Q2, the gate of a field effect transistor Q9 is connected;
the collector of the first transistor Q1 is connected with the positive pole VCC of the synchronous power supply, and the collector of the second transistor Q2 is connected with the negative pole of the synchronous power supply.
The first diode D1, the second diode D2, and the third diode D3 are all fast recovery diodes.
The cathode of the second diode D2 is connected to the drain of a field effect transistor Q9.
The cathode of the first diode D1 is connected to the source of a field effect transistor Q9.
The field effect transistor Q9 is of the N-channel type.
The current limiting resistor R1 limits the working current of the synchronous power supply, and the gate resistor RS14 limits the gate current of the field effect transistor Q9.
The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there may be variations in the specific implementation and application range according to the spirit of the present invention, and the content of the description should not be construed as a limitation to the present invention.
Claims (5)
1. A universal analog synchronous rectification circuit, comprising:
a PNP third transistor Q3 and an NPN fourth transistor Q4, the emitter of the third transistor Q3 is connected to the source of the field effect transistor Q9 through a first diode D1 and a second resistor R2, and the emitter of the fourth transistor Q4 is connected to the drain of the field effect transistor Q9 through a second diode D2 and a third resistor R3;
the base electrode of the third transistor Q3 is connected with the collector electrode of the fourth transistor Q4 and then connected with the positive electrode VCC of the synchronous power supply through a fourth resistor R4, and the connection point of the fourth resistor R4 is also connected with the base electrode of the fourth transistor Q4;
the connection point of the fourth resistor R4 is further connected to the base of the first transistor Q1, the base of the second transistor Q2, the collector of the third transistor Q3 through a third diode D3, and then connected to the positive electrode VCC of the synchronous power supply through a fifth resistor R5;
after the emitter of the first transistor Q1 is connected with the emitter of the second transistor Q2, the gate of a field effect transistor Q9 is connected;
the collector of the first transistor Q1 is connected with the positive pole VCC of the synchronous power supply, and the collector of the second transistor Q2 is connected with the negative pole of the synchronous power supply.
2. The universal analog synchronous rectification circuit according to claim 1, wherein the first diode D1, the second diode D2 and the third diode D3 are all fast recovery diodes.
3. The universal analog synchronous rectification circuit according to claim 1, wherein a cathode of the second diode D2 is connected to a drain of a field effect transistor Q9.
4. The universal analog synchronous rectification circuit according to claim 1, wherein the cathode of the first diode D1 is connected to the source of a field effect transistor Q9.
5. The universal analog synchronous rectification circuit according to claim 1, wherein said field effect transistor Q9 is of N-channel type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021219795.2U CN212381124U (en) | 2020-06-29 | 2020-06-29 | General type analog synchronous rectification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021219795.2U CN212381124U (en) | 2020-06-29 | 2020-06-29 | General type analog synchronous rectification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212381124U true CN212381124U (en) | 2021-01-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021219795.2U Active CN212381124U (en) | 2020-06-29 | 2020-06-29 | General type analog synchronous rectification circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212381124U (en) |
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2020
- 2020-06-29 CN CN202021219795.2U patent/CN212381124U/en active Active
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