CN203278207U - Switching circuit with overheat switch-off function - Google Patents
Switching circuit with overheat switch-off function Download PDFInfo
- Publication number
- CN203278207U CN203278207U CN 201320338015 CN201320338015U CN203278207U CN 203278207 U CN203278207 U CN 203278207U CN 201320338015 CN201320338015 CN 201320338015 CN 201320338015 U CN201320338015 U CN 201320338015U CN 203278207 U CN203278207 U CN 203278207U
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- triode
- nmos pipe
- switching circuit
- function
- circuit
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Abstract
The utility model discloses a switching circuit with an overheat switch-off function. The switching circuit with the overheat switch-off function includes an NMOS tube Q1 and a triode Q2; the source of the NMOS tube Q1 is connected with a port; the drain of the NMOS tube Q1 is connected with an internal circuit; the gate of the NMOS tube Q1 is connected with the collector of the triode Q2; the emitter of the triode Q2 is grounded; and the gate of the NMOS tube Q1 and the base of the triode Q2 are both connected with a reference power source. The switching circuit with the overheat switch-off function of the utility model is advantageous in that the switching circuit can automatically switch off the communication from the port to the internal circuit, and therefore, the circuit can be protected.
Description
Technical field
The utility model relates to a kind of protective circuit, particularly relates to a kind of switching circuit with overheated turn-off function.
Background technology
A lot of electronic devices are often too high because of operating ambient temperature, thereby cause burning out, and like this user caused very large loss.
The utility model content
The purpose of this utility model is to overcome the shortcoming and defect of above-mentioned prior art, and a kind of switching circuit with overheated turn-off function is provided, and often solves existing electronic equipment because excess Temperature, and causes the defective that burns out.
The purpose of this utility model is achieved through the following technical solutions: the switching circuit with overheated turn-off function, comprise NMOS pipe Q1 and triode Q2, the source electrode connectivity port of described NMOS pipe Q1, its drain electrode connects internal circuit, and the grid of NMOS pipe Q1 is connected to the collector electrode of triode Q2, the grounded emitter of triode Q2, the grid of described NMOS pipe Q1 and the base stage of triode Q2 all are connected on a reference power supply.Generally; be conducting state between the source electrode of NMOS pipe Q1 and drain electrode; and triode Q2 is cut-off state, is communicated with when making port with internal circuit, when excess Temperature; the base stage of triode Q2 and the lower voltage between emitter; make triode Q2 conducting, thereby drag down the grid level of NMOS pipe Q1, make NMOS pipe Q1 close; namely disconnect the connection of port to internal circuit, protected circuit.
Further, be provided with a resistance R between the grid of described triode Q2 collector electrode and NMOS pipe Q1, protection triode Q2.
The beneficial effects of the utility model are: when the electronic instrument internal temperature was too high, the autoshutdown port was to the connection of internal circuit, thereby protected circuit.
Description of drawings
Fig. 1 is the structural representation of embodiment 1;
Fig. 2 is the structural representation of embodiment 2.
Embodiment
The utility model is described in further detail below in conjunction with embodiment, but structure of the present utility model is not limited only to following examples:
[embodiment 1]
As shown in Figure 1, switching circuit with overheated turn-off function, comprise NMOS pipe Q1 and triode Q2, the source electrode connectivity port of described NMOS pipe Q1, its drain electrode connects internal circuit, and the grid of NMOS pipe Q1 is connected to the collector electrode of triode Q2, the grounded emitter of triode Q2, and the grid of described NMOS pipe Q1 and the base stage of triode Q2 all are connected on a reference power supply.Generally; be conducting state between the source electrode of NMOS pipe Q1 and drain electrode; and triode Q2 is cut-off state, is communicated with when making port with internal circuit, when excess Temperature; the base stage of triode Q2 and the lower voltage between emitter; make triode Q2 conducting, thereby drag down the grid level of NMOS pipe Q1, make NMOS pipe Q1 close; namely disconnect the connection of port to internal circuit, protected circuit.
[embodiment 2]
As Fig. 2, the structure of the present embodiment and embodiment 1 are basically identical, and difference is to be provided with a resistance R, protection triode Q2 between the grid of triode Q2 collector electrode and NMOS pipe Q1.
Claims (2)
1. the switching circuit that has overheated turn-off function, it is characterized in that, comprise NMOS pipe Q1 and triode Q2, the source electrode connectivity port of described NMOS pipe Q1, its drain electrode connects internal circuit, and the grid of NMOS pipe Q1 is connected to the collector electrode of triode Q2, the grounded emitter of triode Q2, and the grid of described NMOS pipe Q1 and the base stage of triode Q2 all are connected on a reference power supply.
2. the switching circuit with overheated turn-off function according to claim 1, is characterized in that, is provided with a resistance R between the grid of described triode Q2 collector electrode and NMOS pipe Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320338015 CN203278207U (en) | 2013-06-14 | 2013-06-14 | Switching circuit with overheat switch-off function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320338015 CN203278207U (en) | 2013-06-14 | 2013-06-14 | Switching circuit with overheat switch-off function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203278207U true CN203278207U (en) | 2013-11-06 |
Family
ID=49508535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320338015 Expired - Fee Related CN203278207U (en) | 2013-06-14 | 2013-06-14 | Switching circuit with overheat switch-off function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203278207U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103281059A (en) * | 2013-06-14 | 2013-09-04 | 成都锐奕信息技术有限公司 | Overheating resistant switching circuit |
| CN103606885A (en) * | 2013-11-20 | 2014-02-26 | 桂林机床电器有限公司 | Anti-overheating electric leakage protection breaker |
-
2013
- 2013-06-14 CN CN 201320338015 patent/CN203278207U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103281059A (en) * | 2013-06-14 | 2013-09-04 | 成都锐奕信息技术有限公司 | Overheating resistant switching circuit |
| CN103606885A (en) * | 2013-11-20 | 2014-02-26 | 桂林机床电器有限公司 | Anti-overheating electric leakage protection breaker |
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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: 20131106 Termination date: 20160614 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |