CN208509336U - A kind of metal-oxide-semiconductor short-circuit protection circuit - Google Patents
A kind of metal-oxide-semiconductor short-circuit protection circuit Download PDFInfo
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- CN208509336U CN208509336U CN201821282124.3U CN201821282124U CN208509336U CN 208509336 U CN208509336 U CN 208509336U CN 201821282124 U CN201821282124 U CN 201821282124U CN 208509336 U CN208509336 U CN 208509336U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model discloses a kind of metal-oxide-semiconductor short-circuit protection circuits, including NPN type triode Q1 and N-type metal-oxide-semiconductor Q2；The base stage of the NPN type triode Q1 is connect with resistance R2 and resistance R3 respectively, and the other end of the resistance R2 and the negative pole end of LED connect, and the other end of the resistance R3 is connect with the source terminal of N-type metal-oxide-semiconductor Q2；The collector of the NPN type triode Q1 is connect by resistance R1 with pwm signal end；The emitter of the NPN type triode Q1 is connect with signal ground end；The source terminal of the N-type metal-oxide-semiconductor Q2 is connect by resistance RS with signal ground end, and the gate terminal of the N-type metal-oxide-semiconductor Q2 is connect with the collector of NPN type triode Q1, the drain electrode end of the N-type metal-oxide-semiconductor Q2 respectively with the positive and negative extreme connection of LED.The utility model devises a kind of metal-oxide-semiconductor short-circuit protection circuit, can be very good to protect LED light.
Description
Technical field
The utility model relates to a kind of metal-oxide-semiconductor short-circuit protection circuits.
Background technique
LED light is increasingly liked by masses because of its energy conservation and long-life at present, and as the requirement of people mentions
The LED light of height, tunable optical is also popular, but if LED drive power output end series connection MOS scheme carry out light modulation or
If switch control, the short-circuit protection problem of power output end is often had.The utility model proposes a kind of novel short circuits to protect
Shield scheme solves the problems, such as this.
Utility model content
The utility model aim is to provide a kind of metal-oxide-semiconductor short-circuit protection circuit in view of the defects existing in the prior art.
The utility model to achieve the above object, adopts the following technical scheme that a kind of metal-oxide-semiconductor short-circuit protection circuit, including
NPN type triode Q1 and N-type metal-oxide-semiconductor Q2；The base stage of the NPN type triode Q1 is connect with resistance R2 and resistance R3 respectively, institute
The negative pole end of the other end and LED of stating resistance R2 connects, and the other end of the resistance R3 is connect with the source terminal of N-type metal-oxide-semiconductor Q2；
The collector of the NPN type triode Q1 is connect by resistance R1 with pwm signal end；The emitter of the NPN type triode Q1
It is connect with signal ground end；The source terminal of the N-type metal-oxide-semiconductor Q2 is connect by resistance RS with signal ground end, the N-type MOS
The gate terminal of pipe Q2 is connect with the collector of NPN type triode Q1, and the drain electrode end of the N-type metal-oxide-semiconductor Q2 is positive and negative with LED respectively
Extreme connection.
The utility model has the beneficial effects that in the utility model, when short-circuit between LED+ and LED-, the leakage of metal-oxide-semiconductor Q2
Pole tension is higher, and triode Q1 is connected by resistance R2, R3, RS, then turns off metal-oxide-semiconductor Q2.The effect of resistance RS is when short
Road occur moment can open triode Q1 rapidly, protect metal-oxide-semiconductor Q2 not to be damaged, when metal-oxide-semiconductor Q2 normal work when (open or
Close) because the voltage of LED- may be higher, need voltage the base stage of triode Q1 through resistance R1, R2, R3, RS,
Ensure that triode Q1 is to disconnect.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Specific embodiment
Shown in Fig. 1, it is related to a kind of metal-oxide-semiconductor short-circuit protection circuit, including NPN type triode Q1 and N-type metal-oxide-semiconductor Q2；It is described
The base stage of NPN type triode Q1 is connect with resistance R2 and resistance R3 respectively, and the other end of the resistance R2 and the negative pole end of LED connect
It connects, the other end of the resistance R3 is connect with the source terminal of N-type metal-oxide-semiconductor Q2；The collector of the NPN type triode Q1 passes through electricity
Resistance R1 is connect with pwm signal end；The emitter of the NPN type triode Q1 is connect with signal ground end；The N-type metal-oxide-semiconductor Q2
Source terminal connect with signal ground end by resistance RS, the gate terminal of the N-type metal-oxide-semiconductor Q2 and the collection of NPN type triode Q1
Electrode connection, the drain electrode end of the N-type metal-oxide-semiconductor Q2 respectively with the positive and negative extreme connection of LED.
In the utility model, when short-circuit between LED+ and LED-, the drain voltage of metal-oxide-semiconductor Q2 is higher, by resistance R2,
Triode Q1 is connected by R3, RS, then turns off metal-oxide-semiconductor Q2.The effect of resistance RS is to open three rapidly when moment occurs for short circuit
Pole pipe Q1 protects metal-oxide-semiconductor Q2 not to be damaged, when metal-oxide-semiconductor Q2 is worked normally (on or off), because the voltage of LED- may be compared with
Height needs to pass through the base stage of triode Q1 resistance R1, R2, R3, RS for voltage, it is ensured that triode Q1 is to disconnect.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (1)
1. a kind of metal-oxide-semiconductor short-circuit protection circuit, which is characterized in that including NPN type triode Q1 and N-type metal-oxide-semiconductor Q2；The NPN
The base stage of type triode Q1 is connect with resistance R2 and resistance R3 respectively, and the other end of the resistance R2 and the negative pole end of LED connect,
The other end of the resistance R3 is connect with the source terminal of N-type metal-oxide-semiconductor Q2；The collector of the NPN type triode Q1 passes through resistance
R1 is connect with pwm signal end；The emitter of the NPN type triode Q1 is connect with signal ground end；The N-type metal-oxide-semiconductor Q2's
Source terminal is connect by resistance RS with signal ground end, the gate terminal of the N-type metal-oxide-semiconductor Q2 and the current collection of NPN type triode Q1
Pole connection, the drain electrode end of the N-type metal-oxide-semiconductor Q2 respectively with the positive and negative extreme connection of LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821282124.3U CN208509336U (en) | 2018-08-09 | 2018-08-09 | A kind of metal-oxide-semiconductor short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821282124.3U CN208509336U (en) | 2018-08-09 | 2018-08-09 | A kind of metal-oxide-semiconductor short-circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208509336U true CN208509336U (en) | 2019-02-15 |
Family
ID=65300166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821282124.3U Active CN208509336U (en) | 2018-08-09 | 2018-08-09 | A kind of metal-oxide-semiconductor short-circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208509336U (en) |
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2018
- 2018-08-09 CN CN201821282124.3U patent/CN208509336U/en active Active
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