CN207677429U - A kind of LED switch power input under-voltage protecting circuit - Google Patents
A kind of LED switch power input under-voltage protecting circuit Download PDFInfo
- Publication number
- CN207677429U CN207677429U CN201721928863.0U CN201721928863U CN207677429U CN 207677429 U CN207677429 U CN 207677429U CN 201721928863 U CN201721928863 U CN 201721928863U CN 207677429 U CN207677429 U CN 207677429U
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- CN
- China
- Prior art keywords
- electrically connected
- triode
- comparator
- voltage
- optocoupler
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Abstract
The utility model discloses a kind of LED switch power input under-voltage protecting circuits,Include comparator U1 and switching circuit,The in-phase input end of comparator U1 is electrically connected with external voltage input terminal,The inverting input of comparator U1 connects reference voltage,The output end of comparator U1 is electrically connected with switching circuit,Switching circuit is also connected with external modulation circuit,Comparator U1 is used to the voltage value that external voltage input terminal inputs being compared after processing with reference voltage exports control signal to switching circuit,The switching circuit is for receiving the control signal to realize being switched on or off for switching circuit,To control whether external modulation circuit works,The utility model realizes the under-voltage protection to circuit by using comparator U1 and switching circuit,Protect external modulation circuit,So that they can work normally,Effectively promote product reliability.
Description
Technical field
The utility model is related to LED drive power field, especially a kind of LED switch power input under-voltage protecting circuit.
Background technology
The product of high-power LED driving power source on the market is in the more severe place of some power supplies easily by fluctuated
Input voltage influence, allowing product, move to after maximum still can not be normally for carrying, to allow damage of product for duty ratio at low voltage.
Utility model content
In order to solve the above technical problems, the purpose of this utility model is to provide a kind of LED switch power input under-voltage protection
Circuit.
The technical solution adopted in the utility model is：
A kind of LED switch power input under-voltage protecting circuit, including comparator U1 and switching circuit, comparator U1's is same
Phase input terminal is electrically connected with external voltage input terminal, and the inverting input of comparator U1 connects reference voltage, comparator U1's
Output end is electrically connected with switching circuit, and switching circuit is also connected with external modulation circuit, and comparator U1 is used for external voltage
The voltage value of input terminal input is compared after processing with reference voltage and exports control signal to switching circuit, which uses
In receiving the control signal to realize being switched on or off, to control whether external modulation circuit works of switching circuit.
The switching circuit includes optocoupler U2 and triode component, and first port and the comparator U1 of optocoupler U2 electrically connect
It connects, second port and the ground terminal of optocoupler U2 are electrically connected, and the third port of optocoupler U2 electrically connects with one end of triode component
It connects, the 4th port and the ground terminal of optocoupler U2 are electrically connected, and the other end and the external modulation circuit of triode component are electrically connected.
The three-level tube assembly includes triode Q1 and triode Q2, the ground level of triode Q1 and the third end of optocoupler U2
Mouth is electrically connected, and the collector of triode Q1 is electrically connected respectively at the third port of optocoupler U2, the ground level of triode Q2, three poles
The emitter of pipe Q1 is electrically connected with ground terminal, and collector and the external modulation circuit of triode Q2 are electrically connected.
The utility model further includes protection diode Q3, and the one end protection diode Q3 and the third port of optocoupler U2 are electrical
The ground level of connection, the other end and triode Q1 is electrically connected.
The utility model further includes protection diode Q4, and the one end protection diode Q4 and the output end of comparator U1 are electrical
The first port of connection, the other end and optocoupler U2 is electrically connected.
The utility model further includes protection diode Q5, and the one end protection diode Q5 and the collector of triode Q2 are electrical
Connection, the other end and external modulation circuit are electrically connected.
The beneficial effects of the utility model：
The utility model realizes the under-voltage protection to circuit by using comparator U1 and switching circuit, protects outer
Portion's modulation circuit effectively promotes product reliability so that they can work normally.
Description of the drawings
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings.
Fig. 1 is the circuit diagram of the utility model.
Specific implementation mode
As shown in Figure 1, a kind of LED switch power input under-voltage protecting circuit, including comparator U1 and switching circuit 1,
The in-phase input end of comparator U1 is electrically connected with external voltage input terminal 4, and the inverting input connection of comparator U1 is with reference to electricity
Pressure, output end and the switching circuit 1 of comparator U1 are electrically connected, and switching circuit 1 is also connected with external modulation circuit 3, the comparator
U1 is used to be compared to export to switching circuit 1 after processing with reference voltage by the voltage value that external voltage input terminal inputs and control
Signal, the switching circuit 1 are used to receive the control signal to realize being switched on or off, to control outside of switching circuit 1
Whether modulation circuit 3 works.The utility model realizes the under-voltage guarantor to circuit by using comparator U1 and switching circuit 1
Shield, protects external modulation circuit 3, so that they can work normally, effectively promote product reliability.
The switching circuit 1 includes optocoupler U2 and triode component 2, and the first port and comparator U1 of optocoupler U2 is electrical
Connection, second port and the ground terminal of optocoupler U2 are electrically connected, and the third port of optocoupler U2 and one end of triode component 2 are electrical
Connection, the 4th port and the ground terminal of optocoupler U2 are electrically connected, and the other end and external modulation circuit 3 of triode component 2 are electrical
Connection.
The three-level tube assembly includes triode Q1 and triode Q2, the ground level of triode Q1 and the third end of optocoupler U2
Mouth is electrically connected, and the collector of triode Q1 is electrically connected respectively at the third port of optocoupler U2, the ground level of triode Q2, three poles
The emitter of pipe Q1 is electrically connected with ground terminal, and collector and the external modulation circuit 3 of triode Q2 are electrically connected.
The operation principle of the utility model is：It is higher than Voltage Reference when 4 input voltage of external voltage input terminal is normal
The output end of value, comparator U1 exports high level, and the diode electric current for flowing through optocoupler U2 becomes larger, optocoupler U2 saturations, triode Q1,
Triode Q2 is turned off；When input voltage is less than voltage reference value, the output end of comparator U1 exports low level, optocoupler U2's
Diode electric current reduces, and tri- polar bodys of optocoupler U2 exit saturation, triode Q1 saturations, triode Q2 base stage low levels, triode Q2
Saturation conduction exports high level to external modulation circuit 3, and the output of external modulation circuit 3PWM signals is closed, to realize that input is owed
Pressure protection, effectively promotes product reliability.
The utility model further includes protection diode Q3, and the one end protection diode Q3 and the third port of optocoupler U2 are electrical
The ground level of connection, the other end and triode Q1 is electrically connected.
The utility model further includes protection diode Q4, and the one end protection diode Q4 and the output end of comparator U1 are electrical
The first port of connection, the other end and optocoupler U2 is electrically connected.
The utility model further includes protection diode Q5, and the one end protection diode Q5 and the collector of triode Q2 are electrical
Connection, the other end and external modulation circuit 3 are electrically connected.
Above-mentioned protection diode Q3, protection diode Q4, protection diode Q5 all have the effect of voltage stabilizing, overcurrent protection.
The foregoing is merely the preferred embodiments of the utility model, the utility model is not limited to above-mentioned embodiment party
Formula, if with essentially identical means realize the technical solution of the utility model aim belong to the scope of protection of the utility model it
It is interior.
Claims (6)
1. a kind of LED switch power input under-voltage protecting circuit, it is characterised in that:Including comparator U1 and switching circuit, than
In-phase input end compared with device U1 is electrically connected with external voltage input terminal, and the inverting input of comparator U1 connects reference voltage,
The output end of comparator U1 is electrically connected with switching circuit, and switching circuit is also connected with external modulation circuit, and comparator U1 is used for
The voltage value that external voltage input terminal inputs is compared with reference voltage after processing and exports control signal to switching circuit, it should
Switching circuit is used to receive the control signal to realize being switched on or off of switching circuit, be to control external modulation circuit
No work.
2. a kind of LED switch power input under-voltage protecting circuit according to claim 1, it is characterised in that：The switch
Circuit includes optocoupler U2 and triode component, and first port and the comparator U1 of optocoupler U2 are electrically connected, and the second of optocoupler U2
Port is electrically connected with ground terminal, and the third port of optocoupler U2 is electrically connected with one end of triode component, and the 4th of optocoupler U2 the
Port is electrically connected with ground terminal, and the other end and the external modulation circuit of triode component are electrically connected.
3. a kind of LED switch power input under-voltage protecting circuit according to claim 2, it is characterised in that：Three pole
Tube assembly includes triode Q1 and triode Q2, and the ground level of triode Q1 is electrically connected with the third port of optocoupler U2, three poles
The collector of pipe Q1 is electrically connected respectively at the ground level of the third port of optocoupler U2, triode Q2, the emitter of triode Q1 with
Ground terminal is electrically connected, and collector and the external modulation circuit of triode Q2 are electrically connected.
4. a kind of LED switch power input under-voltage protecting circuit according to claim 2, it is characterised in that：Further include protecting
Protect diode Q3, the one end protection diode Q3 and the third port electric connection of optocoupler U2, the base of the other end and triode Q1
Grade is electrically connected.
5. a kind of LED switch power input under-voltage protecting circuit according to claim 2, it is characterised in that：Further include protecting
Protect diode Q4, the output end electric connection of the one end protection diode Q4 and comparator U1, the first of the other end and optocoupler U2
Port is electrically connected.
6. a kind of LED switch power input under-voltage protecting circuit according to claim 2, it is characterised in that：Further include protecting
Protect diode Q5, the collector electric connection, the other end and external modulation circuit of the one end protection diode Q5 and triode Q2
It is electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721928863.0U CN207677429U (en) | 2017-12-30 | 2017-12-30 | A kind of LED switch power input under-voltage protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721928863.0U CN207677429U (en) | 2017-12-30 | 2017-12-30 | A kind of LED switch power input under-voltage protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207677429U true CN207677429U (en) | 2018-07-31 |
Family
ID=62972296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721928863.0U Expired - Fee Related CN207677429U (en) | 2017-12-30 | 2017-12-30 | A kind of LED switch power input under-voltage protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207677429U (en) |
-
2017
- 2017-12-30 CN CN201721928863.0U patent/CN207677429U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180731 Termination date: 20211230 |