CN215344376U - Synchronous rectification output circuit - Google Patents
Synchronous rectification output circuit Download PDFInfo
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- CN215344376U CN215344376U CN202120492298.8U CN202120492298U CN215344376U CN 215344376 U CN215344376 U CN 215344376U CN 202120492298 U CN202120492298 U CN 202120492298U CN 215344376 U CN215344376 U CN 215344376U
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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 relates to the technical field of electronics, in particular to a synchronous rectification output circuit, which achieves the purpose of synchronous rectification through a switching tube Q20, a switching tube Q32 and an inductor L701, and adopts a driver U17 to drive the switching tube Q20 and the switching tube Q32, so that the connection mode is simple, the structure of the whole circuit is simple, high-efficiency and low-power-consumption rectification can be achieved, and the circuit is convenient to connect.
Description
Technical Field
The utility model relates to the technical field of electronics, in particular to a synchronous rectification output circuit.
Background
The power supply design is a rectification design of a power supply, and a diode is commonly used for rectification in the prior art, but the rectification of the diode is low in actual efficiency and high in power consumption. In order to avoid the problem of large loss of the diode, the MOS tube is used for rectification in the prior art, so that the rectification efficiency in the DC/DC can be improved, the power consumption can be reduced, and the like.
Disclosure of Invention
The utility model provides a synchronous rectification output circuit aiming at the problems in the prior art, which drives a synchronous rectification module through a driver U17, realizes rectification with high efficiency and low power consumption, and simplifies the connection of the circuit.
In order to solve the technical problems, the utility model adopts the following technical scheme: a synchronous rectification output circuit comprises a rectification driving module, a synchronous rectification module and a signal processing module, wherein the rectification driving module comprises a driver U17, and the synchronous rectification module comprises a switching tube Q20, a switching tube Q32 and an inductor L701; the control end of the switching tube Q20 is connected with the first output end of the driver U17, the control end of the switching tube Q32 is connected with the second output end of the driver U17, the switching tube Q20 is provided with two switching ends, the switching tube Q32 is provided with two switching ends, one switching end of the switching tube Q20 is connected with one switching end of the switching tube Q32, the other switching end of the switching tube Q20 is connected with an external voltage to be rectified, the other switching end of the switching tube Q32 is grounded, one end of the switching tube Q20 connected with the switching tube Q32 is connected with one end of the inductor L701, and the other end of the inductor L701 is a rectifying output end; one end of the inductor L701 is connected to the third output end of the driver U17, the signal processing module is provided with two input ends, one of the input ends is connected to the fourth output end of the driver U17, and the other input end is connected to the other end of the inductor L701.
Preferably, the driver U17 is model APW7164 KE-TRG.
Preferably, the signal processing module includes a first signal stabilizing unit and a second signal stabilizing unit, the first signal stabilizing unit is configured to stabilize an output signal of the fourth output end of the driver U17, the second signal stabilizing unit is configured to stabilize an output signal of the rectification output end of the inductor L701, the driver U17 is provided with a signal feedback input end, and the signal feedback input end is connected to the second signal stabilizing unit.
Preferably, the first signal stabilizing unit includes a capacitor C414, a capacitor C415, and a resistor R155, the capacitor C414 is connected in series with the resistor R155, the fourth output terminal of the driver U17 is grounded through the capacitor C415, and the fourth output terminal of the driver U17 is grounded through the capacitor C414 and the resistor R155 in sequence.
Preferably, the second signal stabilizing unit includes a resistor R66, a resistor R167, a resistor R168, a capacitor C407, and a capacitor C413, the other end of the inductor L701 sequentially passes through the capacitor C413 and the resistor R167 and is grounded, one end of the resistor R168 is connected to one end of the capacitor C407, the other end of the capacitor C407 is grounded, the other end of the resistor R168 is connected to one end of a resistor R66, the other end of the resistor R66 is connected to the other end of the inductor L701, and the signal feedback input end of the driver U17 is connected to one end of the resistor R168.
The utility model has the beneficial effects that:
according to the synchronous rectification output circuit provided by the utility model, the purpose of synchronous rectification is realized through the switching tube Q20, the switching tube Q32 and the inductor L701, the switching tube Q20 and the switching tube Q32 are driven by the driver U17, and the connection mode is simple, so that the whole circuit is simple in structure, high-efficiency and low-power-consumption rectification can be realized, and the circuit is convenient to connect.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
The reference numerals in fig. 1 include:
the device comprises a 1-rectification driving module, a 2-synchronous rectification module, a 3-first signal stabilizing unit and a 4-second signal stabilizing unit.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention is described in detail below with reference to the attached drawings.
The synchronous rectification output circuit provided in this embodiment, as shown in fig. 1, includes a rectification driving module 1, a synchronous rectification module 2, and a signal processing module, where the rectification driving module 1 includes a driver U17, and the synchronous rectification module 2 includes a switching tube Q20, a switching tube Q32, and an inductor L701; the control end of the switching tube Q20 is connected with the first output end of the driver U17, the control end of the switching tube Q32 is connected with the second output end of the driver U17, the switching tube Q20 is provided with two switching ends, the switching tube Q32 is provided with two switching ends, one switching end of the switching tube Q20 is connected with one switching end of the switching tube Q32, the other switching end of the switching tube Q20 is connected with an external voltage to be rectified, the other switching end of the switching tube Q32 is grounded, one end of the switching tube Q20 connected with the switching tube Q32 is connected with one end of the inductor L701, and the other end of the inductor L701 is a rectifying output end; one end of the inductor L701 is connected to the third output end of the driver U17, the signal processing module is provided with two input ends, one of the input ends is connected to the fourth output end of the driver U17, and the other input end is connected to the other end of the inductor L701. Preferably, the driver U17 is model APW7164 KE-TRG.
Specifically, as shown in fig. 1, the pin structure and the connection structure of the driver U17 include a total of 8 pins for the driver U17, where the first output terminal of the driver U17 of this embodiment is pin 2, the second output terminal is pin 4, the third output terminal is pin 8, the fourth output terminal is pin 7, and the signal feedback input terminal is pin 6. The purpose of synchronous rectification is realized through switch tube Q20, switch tube Q32 and inductance L701 to adopt driver U17 drive switch tube Q20, switch tube Q32, driver U17's is small, and the pin is fixed, thereby makes the simple structure of whole circuit, can realize high efficiency, low-power consumption rectification outside, still make things convenient for the connection of circuit, also helps reducing the volume of the synchronous rectification output circuit of this embodiment.
The signal processing module of this embodiment, as shown in fig. 1, includes a first signal stabilizing unit 3 and a second signal stabilizing unit 4, where the first signal stabilizing unit 3 is configured to stabilize an output signal of a fourth output terminal of the driver U17, the second signal stabilizing unit 4 is configured to stabilize an output signal of a rectification output terminal of the inductor L701, and the driver U17 is provided with a signal feedback input terminal, and the signal feedback input terminal is connected to the second signal stabilizing unit 4.
The first signal stabilizing unit 3 comprises a capacitor C414, a capacitor C415 and a resistor R155, the capacitor C414 is connected in series with the resistor R155, the fourth output terminal of the driver U17 is grounded after passing through the capacitor C415, and the fourth output terminal of the driver U17 is grounded after passing through the capacitor C414 and the resistor R155 in sequence.
The second signal stabilizing unit 4 comprises a resistor R66, a resistor R167, a resistor R168, a capacitor C407 and a capacitor C413, the other end of the inductor L701 is grounded after sequentially passing through the capacitor C413 and the resistor R167, one end of the resistor R168 is connected with one end of the capacitor C407, the other end of the capacitor C407 is grounded, the other end of the resistor R168 is connected with one end of a resistor R66, the other end of the resistor R66 is connected with the other end of the inductor L701, and a signal feedback input end of the driver U17 is connected with one end of the resistor R168.
Specifically, the working principle of this embodiment is as follows: when the external voltage to be rectified is 12V, the 12V voltage is input from the switching end of the switching tube Q20, and is rectified by the switching tube Q20 and the switching tube Q32, and the driver U17 controls the on/off of the switching tube Q20 and the switching tube Q32, so that the purpose of synchronous rectification is achieved. The first signal stabilizing unit 3 is a COMP end of the driver U17, i.e., a pin 7, for stabilizing voltage, so that the operation of the driver U17 is more stable, and the second signal stabilizing unit 4 is mainly used for stabilizing the rectified output voltage and filtering out impurity signals, and the rectified output signal is input to a signal feedback input end of the driver U17 after passing through a resistor R66 and a resistor R168, so as to adjust the internal operating voltage and the output voltage of the driver U17, and maintain the stability of the circuit. The embodiment is suitable for low voltage conversion, for example, 12V to 3.3V or 5V, and can be adjusted according to actual conditions.
Although the present invention has been described with reference to the above preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (5)
1. A synchronous rectified output circuit, comprising: the synchronous rectification circuit comprises a rectification driving module, a synchronous rectification module and a signal processing module, wherein the rectification driving module comprises a driver U17, and the synchronous rectification module comprises a switching tube Q20, a switching tube Q32 and an inductor L701;
the control end of the switching tube Q20 is connected with the first output end of the driver U17, the control end of the switching tube Q32 is connected with the second output end of the driver U17, the switching tube Q20 is provided with two switching ends, the switching tube Q32 is provided with two switching ends, one switching end of the switching tube Q20 is connected with one switching end of the switching tube Q32, the other switching end of the switching tube Q20 is connected with an external voltage to be rectified, the other switching end of the switching tube Q32 is grounded, one end of the switching tube Q20 connected with the switching tube Q32 is connected with one end of the inductor L701, and the other end of the inductor L701 is a rectifying output end;
one end of the inductor L701 is connected to the third output end of the driver U17, the signal processing module is provided with two input ends, one of the input ends is connected to the fourth output end of the driver U17, and the other input end is connected to the other end of the inductor L701.
2. A synchronous rectified output circuit according to claim 1, wherein: the driver U17 is model APW7164 KE-TRG.
3. A synchronous rectified output circuit according to claim 1, wherein: the signal processing module comprises a first signal stabilizing unit and a second signal stabilizing unit, the first signal stabilizing unit is used for stabilizing an output signal of a fourth output end of the driver U17, the second signal stabilizing unit is used for stabilizing an output signal of a rectification output end of the inductor L701, the driver U17 is provided with a signal feedback input end, and the signal feedback input end is connected with the second signal stabilizing unit.
4. A synchronous rectified output circuit according to claim 3, wherein: the first signal stabilizing unit comprises a capacitor C414, a capacitor C415 and a resistor R155, the capacitor C414 is connected with the resistor R155 in series, the fourth output end of the driver U17 is grounded after passing through the capacitor C415, and the fourth output end of the driver U17 is grounded after passing through the capacitor C414 and the resistor R155 in sequence.
5. A synchronous rectified output circuit according to claim 3, wherein: the second signal stabilizing unit comprises a resistor R66, a resistor R167, a resistor R168, a capacitor C407 and a capacitor C413, the other end of the inductor L701 is grounded after sequentially passing through the capacitor C413 and the resistor R167, one end of the resistor R168 is connected with one end of the capacitor C407, the other end of the capacitor C407 is grounded, the other end of the resistor R168 is connected with one end of a resistor R66, the other end of the resistor R66 is connected with the other end of the inductor L701, and a signal feedback input end of the driver U17 is connected with one end of the resistor R168.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120492298.8U CN215344376U (en) | 2021-03-08 | 2021-03-08 | Synchronous rectification output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120492298.8U CN215344376U (en) | 2021-03-08 | 2021-03-08 | Synchronous rectification output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215344376U true CN215344376U (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120492298.8U Active CN215344376U (en) | 2021-03-08 | 2021-03-08 | Synchronous rectification output circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215344376U (en) |
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2021
- 2021-03-08 CN CN202120492298.8U patent/CN215344376U/en active Active
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Address after: 523000 No. 5, Zhengwei fifth road, Dongkeng Town, Dongguan City, Guangdong Province Patentee after: GUANGDONG SOHOO TECHNOLOGY Co.,Ltd. Address before: No.1 Junda Road, Dongkeng Town, Dongguan City, Guangdong Province 523000 Patentee before: GUANGDONG SOHOO TECHNOLOGY Co.,Ltd. |