CN203180766U - Adapter input soft start protection circuit - Google Patents
Adapter input soft start protection circuit Download PDFInfo
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- CN203180766U CN203180766U CN 201320179457 CN201320179457U CN203180766U CN 203180766 U CN203180766 U CN 203180766U CN 201320179457 CN201320179457 CN 201320179457 CN 201320179457 U CN201320179457 U CN 201320179457U CN 203180766 U CN203180766 U CN 203180766U
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Abstract
The utility model discloses an adapter input soft start protection circuit, comprising a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, an MOS transistor Q1 and an MOS transistor Q2. The adapter input soft start protection circuit achieves safe transportation of a power adapter and a mainboard system power, effectively prevents a surge current, and prevents a mainboard system from being destroyed.
Description
Technical field
The utility model relates to the protective circuit technical field, relates in particular to a kind of adapter input soft start protective circuit.
Background technology
In the prior art, because the development in pluralism of PC industry, PC has been widely used in all kinds of industries, for example, and industries such as electronic whiteboard, Medical Devices, teaching billboard.Since this type of industry to fail safe and not qualitative requirement than higher, and most of system adopts single DC power source adapter as the supply power mode of system, can produce very big surge impact electric current when the moment of power supply adaptor plug, thereby produce very big surge voltage, the risk that exists mainboard to be burnt too high voltages appears, in main board system moment.
The utility model content
Technical problem to be solved in the utility model is: a kind of adapter input soft start protective circuit is provided, has realized the safe transport of power supply adaptor and main board system power supply, avoided the surge impact electric current effectively, avoid main board system to be burnt.
For solving the problems of the technologies described above, the utility model provides a kind of adapter input soft start protective circuit, comprises diode D1, diode D2, diode D3, diode D4, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, resistance R 1, resistance R2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2;
The negative electrode of diode D1 connects the input VIN_L of network electric power, the plus earth of diode D1, and the negative electrode of diode D1 connects capacitor C 1 ground connection, and the negative electrode of diode D1 connects resistance R 1, and the other end of resistance R 1 connects capacitor C 2 ground connection;
The input VIN_L of network electric power connects the negative electrode of diode D2, and the anode of diode D2 connects the grid level of metal-oxide-semiconductor Q1, diode D2 diode D3 in parallel; The input VIN_L of network electric power is connected with the grid level of metal-oxide-semiconductor Q1 by resistance R 2, and the input VIN_L of network electric power is by resistance R 3 ground connection, and the grid level of metal-oxide-semiconductor Q1 is by resistance R 4 ground connection, and the grid level of metal-oxide-semiconductor Q1 is by capacitor C 3 ground connection; The source ground of metal-oxide-semiconductor Q1, the source electrode of metal-oxide-semiconductor Q1 connects the anode of diode D4, the negative electrode of diode D4 connects the drain electrode of metal-oxide-semiconductor Q1, the drain electrode of metal-oxide-semiconductor Q1 connects resistance R 5, the other end of resistance R 5 connects resistance R 6, the other end of resistance R 6 connects the source electrode of metal-oxide-semiconductor Q2, resistance R 6 capacitor C 4 in parallel, resistance R 5 is connected the grid of metal-oxide-semiconductor Q2 with the link of resistance R 6, the drain electrode of metal-oxide-semiconductor Q2 is connected with system power supply input VIN, and the source electrode of metal-oxide-semiconductor Q2 is connected with the input VIN_L of network electric power.
In sum, owing to adopted technique scheme, the beneficial effects of the utility model are: realized the safe transport of power supply adaptor and main board system power supply, avoided the surge impact electric current effectively, avoided main board system to be burnt.
Description of drawings
Fig. 1 is the circuit theory schematic diagram of the utility model adapter input soft start protective circuit.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Below in conjunction with accompanying drawing the utility model is described further.
As shown in Figure 1, the adapter of the utility model embodiment input soft start protective circuit comprises diode D1, diode D2, diode D3, diode D4, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, resistance R 1, resistance R2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2;
The negative electrode of diode D1 connects the input VIN_L of network electric power, the plus earth of diode D1, and the negative electrode of diode D1 connects capacitor C 1 ground connection, and the negative electrode of diode D1 connects resistance R 1, and the other end of resistance R 1 connects capacitor C 2 ground connection;
The input VIN_L of network electric power connects the negative electrode of diode D2, and the anode of diode D2 connects the grid level of metal-oxide-semiconductor Q1, diode D2 diode D3 in parallel; The input VIN_L of network electric power is connected with the grid level of metal-oxide-semiconductor Q1 by resistance R 2, and the input VIN_L of network electric power is by resistance R 3 ground connection, and the grid level of metal-oxide-semiconductor Q1 is by resistance R 4 ground connection, and the grid level of metal-oxide-semiconductor Q1 is by capacitor C 3 ground connection; The source ground of metal-oxide-semiconductor Q1, the source electrode of metal-oxide-semiconductor Q1 connects the anode of diode D4, the negative electrode of diode D4 connects the drain electrode of metal-oxide-semiconductor Q1, the drain electrode of metal-oxide-semiconductor Q1 connects resistance R 5, the other end of resistance R 5 connects resistance R 6, the other end of resistance R 6 connects the source electrode of metal-oxide-semiconductor Q2, resistance R 6 capacitor C 4 in parallel, resistance R 5 is connected the grid of metal-oxide-semiconductor Q2 with the link of resistance R 6, the drain electrode of metal-oxide-semiconductor Q2 is connected with system power supply input VIN, and the source electrode of metal-oxide-semiconductor Q2 is connected with the input VIN_L of network electric power.
During work, when power supply adaptor is being extracted moment, input VIN_L moment of the network electric power that links to each other with power supply adaptor produces very big surge impact electric current, this moment is by high frequency, high-voltage capacitance C1 absorbing high-frequency high-tension current, the resistance-capacitance network of forming by resistance R 1, capacitor C 2 absorbs the low-frequency high-voltage electric current, make power supply adaptor pull out away back generation negative voltage, diode D1 can make power supply that the loop is arranged, and the negative pressure of avoiding producing is damaged resistance R 1, capacitor C 1, capacitor C 2.
When power supply adaptor inserts moment, the grid of metal-oxide-semiconductor Q2P channel MOS tube becomes high level rapidly by R6, as shown in Figure 1, the 4th pin of metal-oxide-semiconductor Q2 and the 1st pin, the 2nd pin, the voltage of the 3rd pin all equates, metal-oxide-semiconductor Q2 is in by state, the voltage of system power supply input VIN is 0V at this moment, at this moment, the input VIN_L of network electric power is by resistance R 2,4 pairs of capacitor C 3 of resistance R are charged, after this N-channel MOS pipe Q1 is from slowly opening by state, at this moment, the grid of P channel MOS tube Q2 is by resistance R 5, N-channel MOS pipe Q1 is slowly to ground discharge, simultaneously because the existence of capacitor C 4, the velocity of discharge can be slow, but the grid level of P channel MOS tube Q2 has the low level of the conducting P channel MOS tube Q2 that high level becomes slowly, slowly has 0V to become the level same with the input VIN_L of network electric power as system power supply input VIN, so just finish power supply adaptor and be input to system's power supply soft start, impact thereby avoided the system load end to be subjected to excessive surge current effectively.
Power supply adaptor passes through P channel MOS tube Q2 as electronic switch; as whole system power supply supply valve; as long as the switching speed of valve controlled well just can be controlled the conversion rate of the electric current of power supply adaptor plug moment effectively; thereby control the plug crest voltage of moment effectively, reach the protection purpose.
The above is embodiment of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also are considered as protection range of the present utility model.
Claims (1)
1. an adapter is imported the soft start protective circuit, it is characterized in that, comprise diode D1, diode D2, diode D3, diode D4, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, resistance R 1, resistance R2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q2;
The negative electrode of diode D1 connects the input VIN_L of network electric power, the plus earth of diode D1, and the negative electrode of diode D1 connects capacitor C 1 ground connection, and the negative electrode of diode D1 connects resistance R 1, and the other end of resistance R 1 connects capacitor C 2 ground connection;
The input VIN_L of network electric power connects the negative electrode of diode D2, and the anode of diode D2 connects the grid level of metal-oxide-semiconductor Q1, diode D2 diode D3 in parallel; The input VIN_L of network electric power is connected with the grid level of metal-oxide-semiconductor Q1 by resistance R 2, and the input VIN_L of network electric power is by resistance R 3 ground connection, and the grid level of metal-oxide-semiconductor Q1 is by resistance R 4 ground connection, and the grid level of metal-oxide-semiconductor Q1 is by capacitor C 3 ground connection; The source ground of metal-oxide-semiconductor Q1, the source electrode of metal-oxide-semiconductor Q1 connects the anode of diode D4, the negative electrode of diode D4 connects the drain electrode of metal-oxide-semiconductor Q1, the drain electrode of metal-oxide-semiconductor Q1 connects resistance R 5, the other end of resistance R 5 connects resistance R 6, the other end of resistance R 6 connects the source electrode of metal-oxide-semiconductor Q2, resistance R 6 capacitor C 4 in parallel, resistance R 5 is connected the grid of metal-oxide-semiconductor Q2 with the link of resistance R 6, the drain electrode of metal-oxide-semiconductor Q2 is connected with system power supply input VIN, and the source electrode of metal-oxide-semiconductor Q2 is connected with the input VIN_L of network electric power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320179457 CN203180766U (en) | 2013-04-11 | 2013-04-11 | Adapter input soft start protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320179457 CN203180766U (en) | 2013-04-11 | 2013-04-11 | Adapter input soft start protection circuit |
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| Publication Number | Publication Date |
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| CN203180766U true CN203180766U (en) | 2013-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320179457 Expired - Fee Related CN203180766U (en) | 2013-04-11 | 2013-04-11 | Adapter input soft start protection circuit |
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| CN (1) | CN203180766U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639127A (en) * | 2018-12-21 | 2019-04-16 | 惠科股份有限公司 | Power initiation adjusts circuit and power supply circuit |
| CN110086246A (en) * | 2019-04-30 | 2019-08-02 | 普联技术有限公司 | A kind of anti-voltage overshoot circuit and duplicate supply system for duplicate supply system |
-
2013
- 2013-04-11 CN CN 201320179457 patent/CN203180766U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639127A (en) * | 2018-12-21 | 2019-04-16 | 惠科股份有限公司 | Power initiation adjusts circuit and power supply circuit |
| CN110086246A (en) * | 2019-04-30 | 2019-08-02 | 普联技术有限公司 | A kind of anti-voltage overshoot circuit and duplicate supply system for duplicate supply system |
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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: 20130904 Termination date: 20160411 |
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| CF01 | Termination of patent right due to non-payment of annual fee |