CN206023573U - A kind of circuit for reducing power-on surge - Google Patents
A kind of circuit for reducing power-on surge Download PDFInfo
- Publication number
- CN206023573U CN206023573U CN201621002147.5U CN201621002147U CN206023573U CN 206023573 U CN206023573 U CN 206023573U CN 201621002147 U CN201621002147 U CN 201621002147U CN 206023573 U CN206023573 U CN 206023573U
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- China
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- resistance
- common voltage
- optocoupler
- input
- voltage monitor
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Abstract
This utility model discloses a kind of circuit for reducing power-on surge, which is connected to Switching Power Supply direct-flow input end, including optocoupler, common voltage monitor and a reference source, direct current positive input terminal is connected with common voltage monitor input, power end by 3rd resistor, the 7th resistance respectively, port is driven to be connected with optocoupler positive input terminal through first resistor, direct current negative input end is connected with optocoupler negative input end；Optocoupler positive output end is connected with common voltage monitor input, and optocoupler negative output terminal is connected with direct current negative input end through second resistance, is connected with the 4th resistance between common voltage monitor input and earth terminal, drives port to be connected with common voltage monitor outfan；The 9th resistance, electric capacity and the connection of benchmark source output terminal for driving port to be concatenated, benchmark source output terminal are connected with common voltage monitor power supply end.This utility model controls the cut-in voltage of power supply and shut-off voltage in start process using optocoupler, and cut-in voltage and power cutoff are independent of each other.
Description
Technical field
This utility model is related to the input control circuit of Switching Power Supply, more particularly, to a kind of reduction power-on surge
Circuit.
Background technology
In Electronic Design, surge generally refers to the strong pulse of that moment breath generation that power supply has just been opened, due to electricity
The non-linear pulse that may be above power supply itself on road itself；Or due in power supply or circuit other parts be subject to itself or
External spike interference is called surge.It is likely to make circuit burning out in a flash in surge, and surge protection is exactly using non-
Linear components and parts are to high frequency（Surge）Sensitive design protection circuit.
Content of the invention
For solving the above problems, the purpose of this utility model is to provide a kind of circuit for reducing power-on surge, and which leads to
Cross setting and be reasonably switched on and off voltage, the surge current that can effectively suppress power supply to start shooting.
For achieving the above object, this utility model is adopted the following technical scheme that：
A kind of circuit for reducing power-on surge, which is connected to Switching Power Supply direct-flow input end, including optocoupler, general electricity
Pressure monitor and a reference source, direct current positive input terminal is respectively by the input of 3rd resistor, the 7th resistance and common voltage monitor
End, power end connection, drive port to be connected with the positive input terminal of optocoupler by first resistor, and direct current negative input end is negative with optocoupler
Input connects；The positive output end of optocoupler is connected with the input of common voltage monitor, and the negative output terminal of optocoupler passes through second
Resistance is connected with direct current negative input end, is connected with the 4th resistance between the input and earth terminal of common voltage monitor, output
The 8th resistance is connected between end and power end, drives port to be connected with the outfan of common voltage monitor；Port is driven to lead to
Cross the electricity of the outfan connection of the 9th resistance, electric capacity and a reference source of series connection, the outfan of a reference source and common voltage monitor
Source connects, and is connected with the 5th resistance, connects between the input of a reference source and direct current negative input end between input and outfan
It is connected to the 6th resistance.
There is following superiority due to adopting technical scheme as above, this utility model：
The circuit of the reduction power-on surge, accurate, the repeatable operation of its easy to use, control, reliability are high, adopt
The cut-in voltage and shut-off voltage of power supply in optocoupler control start process, cut-in voltage and power cutoff are independent of each other, and effect is bright
Aobvious, it is adaptable to the start control of Switching Power Supply.
Description of the drawings
Fig. 1 is the schematic diagram of the circuit that this utility model reduces power-on surge.
Specific embodiment
With reference to the accompanying drawings and examples the technical solution of the utility model is described in further detail.
As shown in figure 1, the circuit of the reduction power-on surge, which is connected to Switching Power Supply direct-flow input end, including light
Coupling N1, common voltage monitor N2 and a reference source N3, direct current positive input terminal by 3rd resistor R3, the 7th resistance R7 and are led to respectively
Connected with the input of voltage monitor N2, power end, drive positive input terminal of the port by first resistor R1 with optocoupler N1 to connect
Connect, direct current negative input end is connected with the negative input end of optocoupler N1；The positive output end of optocoupler N1 is defeated with common voltage monitor N2's
Enter end connection, the negative output terminal of optocoupler N1 is connected with direct current negative input end by second resistance R2, common voltage monitor N2's
The 4th resistance R4 is connected between input and earth terminal, is connected with the 8th resistance R8, drive end between outfan and power end
Mouth is connected with the outfan of common voltage monitor N2；Drive nineth resistance R9, electric capacity C1 and a reference source of the port by series connection
The outfan connection of N3, the outfan of a reference source is connected with the power end of common voltage monitor N2, input and outfan it
Between be connected with the 5th resistance R5, be connected with the 6th resistance R6 between the input of a reference source and direct current negative input end.
Above-mentioned driving port, i.e., the driving voltage produced after electric power starting.
This utility model reduces the working method of the circuit of power-on surge：In power initiation, optocoupler N1 due to
Be driven the control of port, the input no current of optocoupler N1, output in short-circuit condition, now second resistance R2,
Four resistance R4 are in parallel connection, and the cut-in voltage of power supply is determined by second resistance R2, the 4th resistance R4 parallel connections resistance.Work as direct current
When input terminal voltage is not up to the cut-in voltage of power supply, the outfan output low level of common voltage monitor N2 is electric without driving
Pressure.When direct-flow input end voltage reaches the cut-in voltage of power supply, the outfan of common voltage monitor N2 exports a high electricity
Flat, while producing drive signal after power initiation, the shut-off voltage of power supply is determined by the 4th resistance R4.When direct-flow input end voltage
When dropping to shut-off voltage, drive end is dragged down, power remove by the outfan output low level of common voltage monitor N2, from
And realize the mutual switching of start voltage and shut-off voltage.
Claims (1)
1. a kind of circuit for reducing power-on surge, is characterized in that：Which is connected to Switching Power Supply direct-flow input end, including light
Coupling, common voltage monitor and a reference source, direct current positive input terminal is respectively by the monitoring of 3rd resistor, the 7th resistance and common voltage
The input of device, power end connection, drive port be connected with the positive input terminal of optocoupler by first resistor, direct current negative input end and
The negative input end connection of optocoupler；The positive output end of optocoupler is connected with the input of common voltage monitor, the negative output terminal of optocoupler
It is connected with direct current negative input end by second resistance, between the input and earth terminal of common voltage monitor, is connected with the 4th electricity
Resistance, is connected with the 8th resistance between outfan and power end, drive port to be connected with the outfan of common voltage monitor；Drive
Outfan connection of the port by the 9th resistance, electric capacity and a reference source of series connection, the outfan of a reference source are monitored with common voltage
The power end connection of device, is connected with the 5th resistance, the input of a reference source and direct current negative input end between input and outfan
Between be connected with the 6th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621002147.5U CN206023573U (en) | 2016-08-31 | 2016-08-31 | A kind of circuit for reducing power-on surge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621002147.5U CN206023573U (en) | 2016-08-31 | 2016-08-31 | A kind of circuit for reducing power-on surge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206023573U true CN206023573U (en) | 2017-03-15 |
Family
ID=58255182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621002147.5U Expired - Fee Related CN206023573U (en) | 2016-08-31 | 2016-08-31 | A kind of circuit for reducing power-on surge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206023573U (en) |
-
2016
- 2016-08-31 CN CN201621002147.5U patent/CN206023573U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170315 Termination date: 20190831 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |