CN201877780U - Protection circuit with prompting function - Google Patents
Protection circuit with prompting function Download PDFInfo
- Publication number
- CN201877780U CN201877780U CN2010206735102U CN201020673510U CN201877780U CN 201877780 U CN201877780 U CN 201877780U CN 2010206735102 U CN2010206735102 U CN 2010206735102U CN 201020673510 U CN201020673510 U CN 201020673510U CN 201877780 U CN201877780 U CN 201877780U
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- circuit
- switch
- load
- connects
- prompt facility
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Abstract
The utility model relates to a protection circuit with a prompting function, which is connected with a load driving circuit and comprises a sampling resistor connected with a load in series, wherein the sampling resistor collects load current signals, the signals are output to a switch circuit after being processed by a signal processing circuit, the load driving circuit is controlled to be switched off by the switch circuit to realize the circuit protection, the protection circuit also comprises an indicating lamp circuit, and the indicating lamp circuit is connected with the switch circuit and is used for indicating the protection circuit to start the driving circuit overflow. The protection circuit disclosed by the utility model has the beneficial effects that the protection circuit is matched with an induction switch to be used for protecting an induction switch circuit which is not monitored by people, the driving circuit can be cut off in time when conditions such as overcurrent, short circuit and the like occur, the load and the induction switch are protected, in addition, the circuit is provided with the indicating lamp circuit for prompting people to repair the circuit in time, the use is convenient, and the humanized effect is realized.
Description
Technical field
The utility model relates to the electronic switching technology field, is specifically related to a kind of protective circuit of the band prompt facility with protective circuit.
Background technology
Extensive uses such as the protective circuit of infrared band prompt facility, acousto-optic control electronic switch, these switches extinguish illuminating lamp automatically there being the people to realize opening illuminating lamp by responding to human body infrared or footsteps etc. through out-of-date behind the certain hour, have good energy-saving effect.But because the general no worker monitor of these inductive switches, as situations such as overcurrent, short circuit appear, people can not in time find, often cause the damage or the waste of electric energy of load lamp.
Summary of the invention
The problem that the utility model need solve provides a kind of protective circuit with prompt facility.
For solving the problems of the technologies described above; the utility model is realized by the following technical solutions: a kind of protective circuit with prompt facility; be connected with load driving circuits; comprise the sampling resistor of connecting with load; sampling resistor is gathered load current signal; this signal is exported to switching circuit after signal processing circuit is handled, disconnected by switching circuit control load drive circuit and realize route protection.
Preferably, described protective circuit further comprises the indicator light circuit that is used to indicate protective circuit startup drive circuit overcurrent that is connected with switching circuit.
Concrete, described signal processing circuit comprises bridge rectifier, voltage-stabiliser tube voltage stabilizing circuit and the capacitor filter that connects successively.Described switching circuit adopts optocoupler, and its input connects the signal processing circuit output, and output connects the first switch triode base stage, and the described first switch triode collector electrode connects load driving circuits and drives input, emitter grounding.Described indicator light circuit comprises a light-emitting diode, and its negative electrode connects the above-mentioned first switch triode collector electrode, and anode connects the first switch triode base stage by second switch three.Described second switch three is taken over emitter-base bandgap grading and is connect load driving circuits introducing power supply, and collector electrode connects the first switch triode base stage by resistance, base stage sending and receiving optical diode anode.
Compared with prior art, the beneficial effects of the utility model are: described protective circuit cooperates inductive switch to use, inductive switch circuit to no worker monitor is protected, as situations such as overcurrent, short circuit occur and can in time cut off drive circuit, protection load and inductive switch; And described circuit has the timely reminds people of indicator light circuit and it is repaired easy to use, hommization.
Description of drawings
Fig. 1 is the utility model embodiment circuit theory schematic diagram.
Embodiment
For the ease of it will be appreciated by those skilled in the art that the utility model is explained in further detail below in conjunction with accompanying drawing and embodiment.
As Fig. 1, the protective circuit of the band prompt facility that discloses in the present embodiment is connected with load driving circuits, comprises the signal processing circuit, the switching circuit that are connected successively with the sampling resistor R5 of load series connection, with sampling resistor R5.
Wherein, signal processing circuit comprises bridge rectifier DB2, voltage-stabiliser tube Z1 voltage stabilizing circuit and the filter capacitor C2 that connects successively.
Wherein, switching circuit adopts optocoupler U1, and its input connects the signal processing circuit output, and output connects the first switch triode Q3 base stage, and the first switch triode Q3 collector electrode connects load driving circuits and drives input POWER, emitter grounding.
Wherein, indicator light circuit comprises light-emitting diode D1, and its negative electrode connects the above-mentioned first switch triode Q3 collector electrode, and anode is taken over Q2 by second switch three and connect the first switch triode Q3 base stage.Second switch three is taken over the Q2 emitter-base bandgap grading and is connect load driving circuits introducing power supply, and collector electrode connects the first switch triode Q3 base stage by resistance R 12, Q2 base stage sending and receiving optical diode D1 anode.
Triode Q3 base stage also is connected to filter capacitor C1 and pull down resistor R11, and collector electrode and load driving circuits drive between the input POWER and also be connected to diode D2.
The operation principle of this protective circuit is as follows: in load driving circuits; when the input of 220V AC power; at POWER end input high level; then triode Q4 conducting; and then individual event controllable silicon SCR 1 conducting; load LOAD lamp is bright; when load LOAD break down (short circuit); big electric current, voltage drop can appear in resistance R 5 positions, by rectifier bridge DB2 sampling rectification, sense trigger triode Q3 conducting behind the voltage by optocoupler U1 again; move the POWER terminal potential to ground; then triode Q4 disconnects by, SCR in the drive circuit, and load lamp goes out, and reaches the protection product function.Light-emitting diode D1 is bright after the triode Q3 conducting, then triode Q2 conducting, and electric current makes triode Q3 base stage keep energising through resistance R 12, reaches to continue protection and LED prompt functions.The product protection circuit automatically resets behind fault clearance product outage 15S, and product powers on once more and enters operate as normal.
The foregoing description is the preferred version that the utility model is realized; and indefiniteness is exhaustive; the utility model can also have other variations under same idea; need to prove; under the prerequisite that does not break away from the utility model design, any conspicuous replacement is all within the utility model protection range.
Claims (6)
1. protective circuit with prompt facility; be connected with load driving circuits; it is characterized in that; comprise the sampling resistor of connecting with load; sampling resistor is gathered load current signal; this signal is exported to switching circuit after signal processing circuit is handled, disconnected by switching circuit control load drive circuit and realize route protection.
2. the protective circuit of band prompt facility according to claim 1 is characterized in that: further comprise the indicator light circuit that is used to indicate protective circuit startup drive circuit overcurrent that is connected with switching circuit.
3. the protective circuit of band prompt facility according to claim 2 is characterized in that: described signal processing circuit comprises bridge rectifier, voltage-stabiliser tube voltage stabilizing circuit and the capacitor filter that connects successively.
4. the protective circuit of band prompt facility according to claim 3; it is characterized in that: described switching circuit adopts optocoupler; its input connects the signal processing circuit output; output connects the first switch triode base stage; the described first switch triode collector electrode connects load driving circuits and drives input, emitter grounding.
5. the protective circuit of band prompt facility according to claim 4; it is characterized in that: described indicator light circuit comprises a light-emitting diode; its negative electrode connects the above-mentioned first switch triode collector electrode, and anode connects the first switch triode base stage by second switch three.
6. the protective circuit of band prompt facility according to claim 5 is characterized in that: described second switch three is taken over emitter-base bandgap grading and is connect load driving circuits introducing power supply, and collector electrode connects the first switch triode base stage by resistance, base stage sending and receiving optical diode anode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206735102U CN201877780U (en) | 2010-12-22 | 2010-12-22 | Protection circuit with prompting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206735102U CN201877780U (en) | 2010-12-22 | 2010-12-22 | Protection circuit with prompting function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201877780U true CN201877780U (en) | 2011-06-22 |
Family
ID=44165689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206735102U Expired - Lifetime CN201877780U (en) | 2010-12-22 | 2010-12-22 | Protection circuit with prompting function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201877780U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887762A (en) * | 2013-03-01 | 2014-06-25 | 上海富欣智能交通控制有限公司 | Tunable output channel delay self-recovery over-current protection circuit |
-
2010
- 2010-12-22 CN CN2010206735102U patent/CN201877780U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887762A (en) * | 2013-03-01 | 2014-06-25 | 上海富欣智能交通控制有限公司 | Tunable output channel delay self-recovery over-current protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160729 Address after: 516100, Huizhou County, Guangdong City, Boluo province Jinhu Town Industrial Zone Red Wo Lang Industrial Park Patentee after: Guangdong red hi tech Industrial Co., Ltd. Address before: 516000, Guangdong, Huizhou province Huicheng District Shuikou Office Industrial Zone Patentee before: Huizhou Hongfeng Industrial Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110622 |