CN210577768U - Switching power supply control circuit and switching power supply - Google Patents
Switching power supply control circuit and switching power supply Download PDFInfo
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- CN210577768U CN210577768U CN201921831385.0U CN201921831385U CN210577768U CN 210577768 U CN210577768 U CN 210577768U CN 201921831385 U CN201921831385 U CN 201921831385U CN 210577768 U CN210577768 U CN 210577768U
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Abstract
The utility model provides a switching power supply control circuit and switching power supply, the control circuit includes main control circuit and first electric capacity, the main control circuit control switching power supply work; when the switching power supply works normally, the first capacitor stores energy; when the external power supply of the main control circuit is powered off, the first capacitor supplies power to the main control circuit, and the main control circuit resets. The utility model discloses when the main control circuit external power source outage, can in time turn-off first switch tube.
Description
Technical Field
The utility model relates to a power electronics field, in particular to switching power supply control circuit and switching power supply.
Background
In the existing bridge type switching power supply or other switching power supplies which need a plurality of switching tubes, when the control circuit of one switching tube is suddenly powered off, because the other switching tubes still work, functional errors and even damage of the switching power supply can be caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a when the main control circuit external power source cuts off the power supply suddenly, the switching power supply control circuit of whole switch tubes can both in time break off for when the main control circuit external power source who solves the prior art existence cuts off the power supply suddenly, can not in time turn off the problem of switch tube.
In order to achieve the above object, the utility model provides a switching power supply control circuit, which comprises a main control circuit and a first capacitor, wherein the main control circuit controls the switching power supply to work; when the switching power supply works normally, the first capacitor stores energy; when the external power supply of the main control circuit is powered off, the first capacitor supplies power to the main control circuit, and the main control circuit resets.
Optionally, the control circuit further includes a first control circuit for controlling the first switching tube, and the main control circuit is connected to the first control circuit; when the external power supply of the main control circuit is powered off, the main control circuit outputs a reset signal to the first control circuit, and the first control circuit controls the first switching tube to be switched off.
Optionally, the control circuit further includes a bootstrap capacitor, the bootstrap capacitor is connected to the first control circuit, and when the external power supply of the main control circuit is powered off, the bootstrap capacitor supplies power to the first control circuit.
Optionally, the control circuit further includes a second control circuit for controlling the second switching tube, and the main control circuit is connected to the second control circuit.
The utility model also provides a switching power supply, including above arbitrary switching power supply control circuit.
Compared with the prior art, the utility model has the advantages of it is following: when the switching power supply normally works, the first capacitor stores energy, and the main control circuit controls the switching power supply to work; when the external power supply of the main control circuit is powered off, the first capacitor supplies power to the main control circuit, and the main control circuit resets. When the main control circuit external power source outage, the utility model discloses can in time turn-off switch pipe.
Drawings
FIG. 1 is a schematic diagram of a switching power supply control circuit of the present invention;
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The present invention covers any alternatives, modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.
In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are simplified and in non-precise proportion, so as to facilitate and clearly assist in explaining the embodiments of the present invention.
As shown in fig. 1, the schematic diagram of the switching power supply control circuit of the present invention is illustrated, including the first control circuit controlling the first switch tube M1 of the switching power supply, the second control circuit controlling the second switch tube M2 of the switching power supply, the main control circuit and the first capacitor C00. The main control circuit is respectively connected with the first control circuit and the second control circuit. When the switching power supply normally works, the first capacitor C00 stores energy, and the main control circuit controls the switching power supply to work; when the external power supply of the main control circuit is powered off, the first capacitor C00 supplies power to the main control circuit, the main control circuit resets, the main control circuit outputs a reset signal to the first control circuit, and the first control circuit controls the first switching tube to be switched off. The control circuit further comprises a bootstrap capacitor C1, the bootstrap capacitor C1 is connected with the first control circuit, and when the external power supply of the main control circuit is powered off, the bootstrap capacitor supplies power to the first control circuit. The switching power supply comprises a bridge circuit, a BUCK circuit, a BOOST circuit, a Flybuck circuit and the like.
Although the embodiments have been described and illustrated separately, it will be apparent to those skilled in the art that some common techniques may be substituted and integrated between the embodiments, and reference may be made to one of the embodiments not explicitly described, or to another embodiment described.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (5)
1. A switching power supply control circuit is characterized in that: the circuit comprises a main control circuit and a first capacitor, wherein the main control circuit controls a switching power supply to work; when the switching power supply works normally, the first capacitor stores energy; when the external power supply of the main control circuit is powered off, the first capacitor supplies power to the main control circuit, and the main control circuit resets.
2. The switching power supply control circuit according to claim 1, wherein: the control circuit also comprises a first control circuit for controlling the first switching tube, and the main control circuit is connected with the first control circuit; when the external power supply of the main control circuit is powered off, the main control circuit outputs a reset signal to the first control circuit, and the first control circuit controls the first switching tube to be switched off.
3. The switching power supply control circuit according to claim 2, wherein: the control circuit further comprises a bootstrap capacitor, the bootstrap capacitor is connected with the first control circuit, and when the external power supply of the main control circuit is powered off, the bootstrap capacitor supplies power to the first control circuit.
4. The switching power supply control circuit according to claim 2 or 3, wherein: the control circuit further comprises a second control circuit for controlling a second switching tube, and the main control circuit is connected with the second control circuit.
5. A switching power supply, characterized by: comprising a switching power supply control circuit as claimed in claim 1, 2, 3 or 4 above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921831385.0U CN210577768U (en) | 2019-10-29 | 2019-10-29 | Switching power supply control circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921831385.0U CN210577768U (en) | 2019-10-29 | 2019-10-29 | Switching power supply control circuit and switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210577768U true CN210577768U (en) | 2020-05-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921831385.0U Active CN210577768U (en) | 2019-10-29 | 2019-10-29 | Switching power supply control circuit and switching power supply |
Country Status (1)
| Country | Link |
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| CN (1) | CN210577768U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110808573A (en) * | 2019-10-29 | 2020-02-18 | 杰华特微电子（杭州）有限公司 | Switching power supply control circuit, control method and switching power supply |
-
2019
- 2019-10-29 CN CN201921831385.0U patent/CN210577768U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110808573A (en) * | 2019-10-29 | 2020-02-18 | 杰华特微电子（杭州）有限公司 | Switching power supply control circuit, control method and switching power supply |
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| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |