CN209250219U - A kind of under-voltage delay protection device of power supply - Google Patents
A kind of under-voltage delay protection device of power supply Download PDFInfo
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- CN209250219U CN209250219U CN201920173233.XU CN201920173233U CN209250219U CN 209250219 U CN209250219 U CN 209250219U CN 201920173233 U CN201920173233 U CN 201920173233U CN 209250219 U CN209250219 U CN 209250219U
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Abstract
The utility model discloses a kind of under-voltage delay protection devices of power supply; including sequentially connected voltage collection circuit; voltage comparator and switching circuit; the switching circuit uses metal-oxide-semiconductor Q1; the grid of metal-oxide-semiconductor Q1 passes through resistance R5 connection voltage comparator output end; it is also sequentially connected in series resistance R4, diode D2 and capacitor C1 between voltage comparator output end and power cathode, is connected between the cathode of diode D2 and the grid of metal-oxide-semiconductor Q1 by diode D3.When system is under-voltage, and comparator exports low level, metal-oxide-semiconductor Q1 will not be turned off moment, and the charge stored in capacitor C1 can be transferred to metal-oxide-semiconductor Q1 by diode D3, maintain its conducting, until the end C1 voltage is lower than the conducting voltage of metal-oxide-semiconductor Q1, system can just be complete switched off.The utility model can guarantee that tool is completed corresponding operating under undervoltage condition and powered off again, prevent tool stops suddenly generation can not predictability, while time delayed turn-off can inhibit the switching noise of metal-oxide-semiconductor, improvement EMI and EMC.
Description
Technical field
The utility model relates to under-voltage protection, in particular to a kind of under-voltage delay protection device of power supply.
Background technique
When system work is in normal condition, input voltage can keep stable, when system overcharge work, as motor is stifled
Turn or short circuit, line voltage distribution can reduce much in a short time, working at the same time electric current increased dramatically, and can cause to damage to route.
Under-voltage protection is exactly to detect input voltage, and when input voltage is reduced to critical voltage, protection electric appliance movement, system cut-off claims
For low-voltage protection, task mainly prevents equipment because voltage leads to unsafe condition lower than normal working voltage.
Utility model content
The utility model aim is: a kind of under-voltage delay protection device of power supply is provided, it is electronic for hand-held pipe pressuring connection
Tool completes under-voltage protection by detection cell voltage, and under-voltage protection can be delayed one section after cell voltage is lower than critical value
Again by circuitry cuts after time, preventing tool, power-off suddenly causes tool to be unable to automatic homing to separate with pipeline in use.
The technical solution of the utility model is:
A kind of under-voltage delay protection device of power supply, including sequentially connected voltage collection circuit, voltage comparator and switch
Circuit, the switching circuit use metal-oxide-semiconductor Q1, and the grid of metal-oxide-semiconductor Q1 passes through resistance R5 connection voltage comparator output end, source electrode
With drain series on the cathode supply lines of power supply；Resistance is also sequentially connected in series between voltage comparator output end and power cathode
R4, diode D2 and capacitor C1 are connected between the cathode of diode D2 and the grid of metal-oxide-semiconductor Q1 by diode D3.
Preferably, the voltage collection circuit includes divider resistance R1, the R2 being connected between power positive cathode, and described point
Node between piezoresistance R1, R2 exports sampled voltage.
Preferably, the voltage comparator uses operational amplifier U1, and sampled voltage output end connects operational amplifier U1
Normal phase input end, the inverting input terminal of operational amplifier U1 connects reference voltage.
Preferably, it is also connected by concatenated resistance R3 with zener diode D1 between the power positive cathode, pressure stabilizing two
The node output reference voltage of pole pipe D1 and resistance R3 connect the inverting input terminal of operational amplifier U1.
The utility model has the advantages that:
The utility model can guarantee that tool is completed corresponding operating under undervoltage condition and powered off again, prevent tool from stopping suddenly
Only generate can not predictability, while time delayed turn-off can inhibit the switching noise of metal-oxide-semiconductor, improve EMI and EMC.
Detailed description of the invention
The utility model is further described with reference to the accompanying drawings and embodiments:
Fig. 1 is under-voltage delay protection device schematic diagram of powering.
Specific embodiment
As shown in Figure 1, the under-voltage delay protection device of the power supply of the utility model, including sequentially connected voltage acquisition electricity
Road, voltage comparator and switching circuit, the voltage collection circuit include the divider resistance R1 being connected between power positive cathode,
R2, the node between described divider resistance R1, R2 export sampled voltage.The voltage comparator uses operational amplifier U1, adopts
Sample voltage output end connects the normal phase input end of operational amplifier U1, and the inverting input terminal connection of operational amplifier U1 is with reference to electricity
Pressure.It is also connected by concatenated resistance R3 with zener diode D1 between the power positive cathode, zener diode D1 and resistance
The node output reference voltage of R3 connects the inverting input terminal of operational amplifier U1.The switching circuit uses metal-oxide-semiconductor Q1, MOS
The grid of pipe Q1 is connected on the cathode supply lines of power supply by resistance R5 connection voltage comparator output end, source electrode and drain electrode；
Resistance R4, diode D2 and capacitor C1 are also sequentially connected in series between voltage comparator output end and power cathode, diode D2's is negative
It is connected between pole and the grid of metal-oxide-semiconductor Q1 by diode D3.
The utility model detects input voltage as comparator positive input, zener diode by divider resistance R1, R2
Brownout threshold is arranged as comparator negative input in D1, and comparator exports high level when voltage is normal, and system is connected in driving metal-oxide-semiconductor Q1
It works normally, while being charged by resistance R4, diode D2 to capacitor C1, when system is under-voltage, and comparator exports low level,
Metal-oxide-semiconductor Q1 will not be turned off moment, and the charge stored in capacitor C1 can be transferred to metal-oxide-semiconductor Q1 by diode D3, maintain its conducting,
Until the end C1 voltage is lower than the conducting voltage of metal-oxide-semiconductor Q1, system can just be complete switched off.The utility model can guarantee that tool exists
Corresponding operating is completed under undervoltage condition to power off again, prevent tool stops suddenly generation can not predictability, while time delayed turn-off can
To inhibit the switching noise of metal-oxide-semiconductor, improve EMI and EMC.
The above embodiments are only for explaining the technical ideas and features of the present invention, and its object is to allow be familiar with technique
People can understand the content of the utility model and implement accordingly, do not limit the protection scope of the present invention.It is all
According to the modification that the Spirit Essence of the utility model main technical schemes is done, should all cover in the protection scope of the utility model
Within.
Claims (4)
1. a kind of under-voltage delay protection device of power supply, including sequentially connected voltage collection circuit, voltage comparator and switch electricity
Road, it is characterised in that: the switching circuit uses metal-oxide-semiconductor Q1, and the grid of metal-oxide-semiconductor Q1 is defeated by resistance R5 connection voltage comparator
Outlet, source electrode and drain electrode are connected on the cathode supply lines of power supply；Between voltage comparator output end and power cathode also successively
Series resistance R4, diode D2 and capacitor C1 are connected between the cathode of diode D2 and the grid of metal-oxide-semiconductor Q1 by diode D3
It connects.
2. the under-voltage delay protection device of power supply according to claim 1, it is characterised in that: the voltage collection circuit includes
Divider resistance R1, the R2 being connected between power positive cathode, the node between described divider resistance R1, R2 export sampled voltage.
3. the under-voltage delay protection device of power supply according to claim 2, it is characterised in that: the voltage comparator is using fortune
Amplifier U1 is calculated, sampled voltage output end connects the normal phase input end of operational amplifier U1, the anti-phase input of operational amplifier U1
End connection reference voltage.
4. the under-voltage delay protection device of power supply according to claim 2, it is characterised in that: between the power positive cathode also
It is connected by concatenated resistance R3 with zener diode D1, the node output reference voltage of zener diode D1 and resistance R3, even
Connect the inverting input terminal of operational amplifier U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920173233.XU CN209250219U (en) | 2019-01-31 | 2019-01-31 | A kind of under-voltage delay protection device of power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920173233.XU CN209250219U (en) | 2019-01-31 | 2019-01-31 | A kind of under-voltage delay protection device of power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209250219U true CN209250219U (en) | 2019-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920173233.XU Active CN209250219U (en) | 2019-01-31 | 2019-01-31 | A kind of under-voltage delay protection device of power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114977116A (en) * | 2022-08-02 | 2022-08-30 | 青岛鼎信通讯股份有限公司 | Battery overcurrent and undervoltage protection circuit suitable for electric power product |
-
2019
- 2019-01-31 CN CN201920173233.XU patent/CN209250219U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114977116A (en) * | 2022-08-02 | 2022-08-30 | 青岛鼎信通讯股份有限公司 | Battery overcurrent and undervoltage protection circuit suitable for electric power product |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yao Lu Inventor after: Yu Yuchun Inventor after: Yang Lijie Inventor after: Zhao Xiaoming Inventor after: Wu Shang Inventor before: Yao Lu Inventor before: Yu Yuchun Inventor before: Yang Lijie Inventor before: Zhao Xiaoming Inventor before: Wu Shang |