CN207184144U - A kind of power down holding circuit - Google Patents
A kind of power down holding circuit Download PDFInfo
- Publication number
- CN207184144U CN207184144U CN201721004806.3U CN201721004806U CN207184144U CN 207184144 U CN207184144 U CN 207184144U CN 201721004806 U CN201721004806 U CN 201721004806U CN 207184144 U CN207184144 U CN 207184144U
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- diode
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- power
- detection circuit
- switch
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Abstract
The utility model provides a kind of power down holding circuit, it includes transformer, input power-fail detection circuit, the connection output of transformer one end, 1st pin of transformer after switch connection with first diode one end with being connected, the first diode other end is respectively with inputting power-fail detection circuit, power output end is connected, the power-fail detection circuit other end is inputted to connect with switch, 3rd pin of transformer is connected with second diode one end, the second diode other end successively with current-limiting resistance, it is connected after the connection of 3rd diode one end with switch, current-limiting resistance, the 3rd diode other end is connected after being connected with each other with first electric capacity one end, the first electric capacity other end is grounded.Using the structure after this programme is simple, using effect is good.
Description
Technical field
Field of circuit technology is the utility model is related to, refers in particular to a kind of power down holding circuit.
Background technology
In electronic equipment, power supply is essential part.The power-off of feeder ear transient state or power-off suddenly of system
It is frequent be frequently present of.This requires the power supply of internal system has to resist transient state power-off and maintain a period of time after powering off
To preserve the function of data.
The content of the invention
The purpose of this utility model is overcome the deficiencies in the prior art, there is provided it is a kind of it is simple in construction, using effect is good
Power down holding circuit.
To achieve the above object, technical scheme provided by the utility model is：A kind of power down holding circuit, it includes
Transformer, input power-fail detection circuit, the connection output of transformer one end, the 1st pin of transformer with after switch connection with the one or two
Pole pipe one end connects, and the first diode other end is connected with input power-fail detection circuit, power output end respectively, inputs power down
The circuit other end is detected to connect with switch, the 3rd pin of transformer is connected with second diode one end, the second diode other end according to
It is secondary be connected with current-limiting resistance, the 3rd diode one end after be connected with switch, current-limiting resistance, the 3rd diode other end mutually interconnect
It is connected after connecing with first electric capacity one end, first electric capacity other end ground connection.
The 4th pin ground connection of described transformer.
The utility model is using after such scheme, during normal work, inputs and provides energy to switching power circuit through D1,
Maintain power supply output.Simultaneous Switching power supply auxiliary power supply winding fills after D2 rectifications, by current-limiting resistance R1 to super capacitor C1
Electricity.Power-fail detection circuit control SW is now inputted to close.When inputting power down, input power-fail detection circuit control SW is open-minded, super
Electric capacity C1 quickly provides energy by diode D3 and SW to switching power circuit, maintains power supply output.After this programme
It is simple in construction, using effect is good.
Brief description of the drawings
Fig. 1 is overall structure diagram of the present utility model.
Embodiment
With reference to all accompanying drawings, the utility model is described in further detail, and preferred embodiment of the present utility model is：Ginseng
See accompanying drawing 1, a kind of power down holding circuit described in the present embodiment includes transformer T1, input power-fail detection circuit, transformer
The connection output of T1 one end, transformer T1 the 4th pin ground connection, transformer T1 the 1st pin with switch after SW is connected with the first diode
D1 one end connects, and the first diode D1 other ends are connected with input power-fail detection circuit, power output end respectively, input power down
The detection circuit other end is connected with switch SW, and transformer T1 the 3rd pin is connected with second diode D2 one end, the second diode D2
The other end is connected after being connected successively with current-limiting resistance R1, the 3rd diode D3 one end with switch SW, current-limiting resistance R1, the three or two
The pole pipe D3 other ends are connected after being connected with each other with first electric capacity C1 one end, first electric capacity C1 other ends ground connection.The present embodiment is just
Often during work, input and provide energy to switching power circuit through D1, maintain power supply output.Simultaneous Switching power supply auxiliary power supply winding
After D2 rectifications, charged by current-limiting resistance R1 to super capacitor C1.Power-fail detection circuit control SW is now inputted to close.Input
During power down, input power-fail detection circuit control SW is open-minded, and super capacitor C1 quickly gives switch power supply by diode D3 and SW
Road provides energy, maintains power supply output.Using the structure after the present embodiment is simple, using effect is good.
Embodiment described above is only the preferred embodiment of the utility model, not limits reality of the present utility model with this
Apply scope, therefore the change that all shape, principles according to the utility model are made, it all should cover in the scope of protection of the utility model
It is interior.
Claims (2)
1. a kind of power down holding circuit, it includes transformer（T1）, input power-fail detection circuit, it is characterised in that：Transformer
（T1）One end connection output, transformer（T1）The 1st pin with switch（SW）After connection with the first diode（D1）One end connects, the
One diode（D1）The other end is connected with input power-fail detection circuit, power output end respectively, and input power-fail detection circuit is another
One end and switch（SW）Connection, transformer（T1）The 3rd pin and the second diode（D2）One end connects, the second diode（D2）Separately
One end successively with current-limiting resistance（R1）, the 3rd diode（D3）One end connection after with switch（SW）It is connected, current-limiting resistance（R1）、
3rd diode（D3）The other end be connected with each other after with the first electric capacity（C1）One end connects, the first electric capacity（C1）The other end is grounded.
A kind of 2. power down holding circuit according to claim 1, it is characterised in that：Transformer（T1）The 4th pin ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721004806.3U CN207184144U (en) | 2017-08-11 | 2017-08-11 | A kind of power down holding circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721004806.3U CN207184144U (en) | 2017-08-11 | 2017-08-11 | A kind of power down holding circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207184144U true CN207184144U (en) | 2018-04-03 |
Family
ID=61739780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721004806.3U Active CN207184144U (en) | 2017-08-11 | 2017-08-11 | A kind of power down holding circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207184144U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112615425A (en) * | 2020-12-31 | 2021-04-06 | 广州金升阳科技有限公司 | Power-down delay circuit and detection control circuit thereof |
-
2017
- 2017-08-11 CN CN201721004806.3U patent/CN207184144U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112615425A (en) * | 2020-12-31 | 2021-04-06 | 广州金升阳科技有限公司 | Power-down delay circuit and detection control circuit thereof |
| CN112615425B (en) * | 2020-12-31 | 2023-09-08 | 广州金升阳科技有限公司 | Detection control circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 412000 Hunan Province, Zhuzhou city Tianyuan District Lujiang Road No. 2 Patentee after: Hunan Hongwei Electronic Technology Co., Ltd Address before: 412000 Hunan Province, Zhuzhou city Tianyuan District Lujiang Road No. 2 Patentee before: ZHUZHOU HONGDA MICROELECTRONICS TECHNOLOGY Co.,Ltd. |