CN205123700U - Automatic starting switch circuit of load and firing circuit - Google Patents
Automatic starting switch circuit of load and firing circuit Download PDFInfo
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- CN205123700U CN205123700U CN201520572256.XU CN201520572256U CN205123700U CN 205123700 U CN205123700 U CN 205123700U CN 201520572256 U CN201520572256 U CN 201520572256U CN 205123700 U CN205123700 U CN 205123700U
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- type triode
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Abstract
The utility model discloses a load is from starting switch circuit and firing circuit, include: button switch circuit, NPN type triode circuit, P -MOS manage circuit, circuit load and R5, NPN triode circuit includes electric capacity C1, resistance R1, R2, R3, NPN type triode Q1, electric capacity C1 connects in parallel between NPN type triode Q1's enabling signal ON and ground, resistance R1 connects in parallel between NPN type triode Q1's base and ground, resistance R2 establishes ties between enabling signal ON and base, resistance R3 establishes ties between collecting electrode and mains voltage, emitter ground. The utility model discloses a whether the circuit start is controlled in the access of load, and the circuit is simple, and is with low costs, the dependable performance, easy operation, factor of safety is high.
Description
Technical field
The utility model relates to a kind of load automatic start switch circuit.
Background technology
In common circuit, need the open and close being carried out control circuit operating state by switch key, press switch, power on circuitry; Trip switch, the electricity went off again for circuit.Once press switch, just can automatically keep continuing energising, until press other switch to make it open circuit; Such circuit, is called latching circuit.
Especially in the ignition circuit, need system at once can enter electriferous state by realizing circuit when load accesses, devise a kind of load automatic start switch circuit for this reason.
Utility model content
The purpose of this utility model is for above-mentioned the deficiencies in the prior art, provides a kind of load automatic start switch circuit.
The utility model is achieved through the following technical solutions:
First aspect, the utility model provides a kind of load automatic start switch circuit, comprising: key switch circuit, NPN type triode circuit, P-MOS pipe circuit, circuit load and R5;
Described NPN transistor circuit comprises electric capacity C1, resistance R1, resistance R2, resistance R3, NPN type triode Q1; Described electric capacity C1 is connected in parallel between the enabling signal ON of NPN type triode Q1 and ground; Described resistance R1 is connected in parallel between the base stage of NPN type triode Q1 and ground; Described resistance R2 is connected between enabling signal ON and the base stage of NPN type triode Q1; Described resistance R3 is connected between the collector electrode of NPN type triode Q1 and supply voltage Vbat; The grounded emitter of described NPN type triode Q1;
Described P-MOS pipe circuit comprises electric capacity C2, field effect transistor Q2, Schottky diode D1; Described electric capacity C2 is connected in parallel between supply voltage Vbat and ground GND; The grid of field effect transistor Q2 is connected to the collector electrode of triode Q1, and the source electrode of field effect transistor Q2 is connected to supply voltage Vbat, and the drain electrode of field effect transistor Q2 is connected to output voltage Vpwr; Schottky diode D1 is connected between OFF signal and the drain electrode of field effect transistor Q2;
Described key switch circuit comprises key switch S1 and resistance R4, and key switch S1 is connected between supply voltage Vbat and OFF signal, and resistance R4 is connected between OFF signal and ground.
Preferably, described Schottky diode D1 plays buffer action when circuit working, exports be formed by connecting with key switch and power supply.
Preferably, described load is formed by connecting by the grid of resistance R5 and P-MOS pipe.
Preferably, the electric capacity C1 in described circuit and electric capacity C2 is can modulating capacitor.
Second aspect, the utility model also relates to a kind of firing circuit, comprises aforesaid load automatic start switch circuit.
Operation principle of the present utility model is:
1. when load does not access, load end is unsettled, and circuit realizes on-off state by & off switch S1 and controls.
Under off-mode, press switch S 1, switch on power input voltage Vbat, by supply voltage being passed to output voltage Vpwr after one of Schottky diode D1 very little pressure drop, output voltage Vpwr is by the conversion of DC-DC conversion chip or directly output voltage is passed to master chip, start master chip work, whole process completes within very short time.Master chip sends high level enabling signal ON, is delivered to the base stage of NPN triode after the RC filter circuit by resistance R1, resistance R2 and electric capacity C1 composition, controls triode Q1 conducting.Transistor collector output voltage, to the grid of P-MOSFET pipe Q2, makes P-MOSFET pipe Q2 conducting, supply voltage Vbat is delivered to output Vpwr.Now Schottky diode D1 can isolate output voltage Vpwr and OFF signal, makes complete machine keep open state.
During start, during switch-on keying switch S 1, output a high level signal equally to OFF signal, discharged over the ground by R4 resistance, make OFF signal be in low level.
In circuit working, when again push button switch S 1 time, switch on power voltage Vbat and shutdown signal OFF, by OFF interface, high level signal passed to master chip.After master chip receives signal, to signal ON output low level signal, triode Q1 quits work without level output, causes P-MOS pipe to quit work, Non voltage output, realizes shutdown.
2. when accessing load, load end passes through a very little grounding through resistance, resistance value is negligible relative to whole circuit, the load other end is connected to supply voltage Vbat by R5 and R3, can know that the grid voltage of now P-MOS pipe is about 1/10 of supply voltage Vbat by dividing potential drop, be equivalent to low level, now P-MOSFET pipe Q2 ON operation, output voltage to Vpwr, realizing circuit start effect.Here it should be noted that, after circuit start, be equivalent to R3 and be connected in parallel on load resistance two ends, because the resistance of R3 is very large relative to the resistance value of load, relatively can ignores, ensure not affect load circuit.
Compared with prior art, the beneficial effects of the utility model are:
(1) by the access of load, whether realizing circuit start controls the utility model, and circuit is simple, and cost is low, dependable performance.
(2) the utility model is simple to operate, and coefficient of safety is high.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present utility model will become more obvious:
Fig. 1 is the utility model circuit diagram.
Embodiment
The utility model is described in further detail for following instance.The present embodiment carries out under premised on technical solutions of the utility model, gives detailed execution mode and process.Although be described in detail the utility model with reference to preferred embodiment; it will be understood by those skilled in the art that; still can modify to embodiment of the present utility model or equivalent replacement is carried out to portion of techniques feature; and not departing from the spirit of technical solutions of the utility model, it all should be encompassed in the technical scheme scope of the utility model request protection.
embodiment
Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail: as shown in Figure 1,
A kind of load automatic start switch circuit that the utility model provides, comprising: key switch circuit, NPN type triode circuit, P-MOS pipe circuit, circuit load and resistance R5;
NPN transistor circuit comprises electric capacity C1, resistance R1, resistance R2, resistance R3, NPN type triode Q1; Described electric capacity C1 is connected in parallel between the enabling signal ON of NPN type triode Q1 and ground; Described resistance R1 is connected in parallel between the base stage of NPN type triode Q1 and ground; Described resistance R2 is connected between enabling signal ON and the base stage of NPN type triode Q1; Described resistance R3 is connected between the collector electrode of NPN type triode Q1 and supply voltage Vbat; The grounded emitter of described NPN type triode Q1;
P-MOS pipe circuit comprises electric capacity C2, field effect transistor Q2, Schottky diode D1; Described electric capacity C2 is connected in parallel between supply voltage Vbat and ground GND; The grid of field effect transistor Q2 is connected to the collector electrode of triode Q1, and the source electrode of field effect transistor Q2 is connected to supply voltage Vbat, and the drain electrode of field effect transistor Q2 is connected to output voltage Vpwr; Schottky diode D1 is connected between OFF signal and the drain electrode of field effect transistor Q2;
Key switch circuit comprises key switch S1 and resistance R4, and key switch S1 is connected between supply voltage Vbat and OFF signal, and resistance R4 is connected between OFF signal and ground.
Further, described Schottky diode D1 plays buffer action when circuit working, exports be formed by connecting with key switch and power supply.
Further, described load is formed by connecting by the grid of resistance R5 and P-MOS pipe.
Further, the electric capacity C1 in described circuit and electric capacity C2 is can modulating capacitor.
Further, described circuit spy is used in firing circuit.
Operation principle of the present utility model is:
1. when load does not access, load end is unsettled, and circuit realizes on-off state by & off switch S1 and controls.
Under off-mode, press switch S 1, switch on power input voltage Vbat, by supply voltage being passed to output voltage Vpwr after one of Schottky diode D1 very little pressure drop, output voltage Vpwr is by the conversion of DC-DC conversion chip or directly output voltage is passed to master chip, start master chip work, whole process completes within very short time.Master chip sends high level enabling signal ON, is delivered to the base stage of NPN triode after the RC filter circuit by resistance R1, resistance R2 and electric capacity C1 composition, controls triode Q1 conducting.Transistor collector output voltage, to the grid of P-MOSFET pipe Q2, makes P-MOSFET pipe Q2 conducting, supply voltage Vbat is delivered to output Vpwr.Now Schottky diode D1 can isolate output voltage Vpwr and OFF signal, makes complete machine keep open state.
During start, during switch-on keying switch S 1, output a high level signal equally to OFF signal, discharged over the ground by R4 resistance, make OFF signal be in low level.
In circuit working, when again push button switch S 1 time, switch on power voltage Vbat and shutdown signal OFF, by OFF interface, high level signal passed to master chip.After master chip receives signal, to signal ON output low level signal, triode Q1 quits work without level output, causes P-MOS pipe to quit work, Non voltage output, realizes shutdown.
2. when accessing load, load end passes through a very little grounding through resistance, resistance value is negligible relative to whole circuit, the load other end is connected to supply voltage Vbat by R5 and R3, can know that the grid voltage of now P-MOS pipe is about 1/10 of supply voltage Vbat by dividing potential drop, be equivalent to low level, now P-MOSFET pipe Q2 ON operation, output voltage to Vpwr, realizing circuit start effect.Here it should be noted that, after circuit start, be equivalent to R3 and be connected in parallel on load resistance two ends, because the resistance of R3 is very large relative to the resistance value of load, relatively can ignores, ensure not affect load circuit.
In sum: by the access of load, whether realizing circuit start controls the utility model, and circuit is simple, and cost is low, dependable performance; Simple to operate, coefficient of safety is high.
Above specific embodiment of the utility model is described.It will be appreciated that, the utility model is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, this does not affect flesh and blood of the present utility model, and principle is understandable, structure is simple, and low cost of manufacture, has certain market prospects.
Claims (5)
1. a load automatic start switch circuit, is characterized in that, comprising: key switch circuit, NPN type triode circuit, P-MOS pipe circuit, circuit load and resistance R5;
Described NPN transistor circuit comprises electric capacity C1, resistance R1, resistance R2, resistance R3, NPN type triode Q1; Described electric capacity C1 is connected in parallel between the enabling signal ON of NPN type triode Q1 and ground; Described resistance R1 is connected in parallel between the base stage of NPN type triode Q1 and ground; Described resistance R2 is connected between enabling signal ON and the base stage of NPN type triode Q1; Described resistance R3 is connected between the collector electrode of NPN type triode Q1 and supply voltage Vbat; The grounded emitter of described NPN type triode Q1;
Described P-MOS pipe circuit comprises electric capacity C2, field effect transistor Q2, Schottky diode D1; Described electric capacity C2 is connected in parallel between supply voltage Vbat and ground GND; The grid of field effect transistor Q2 is connected to the collector electrode of triode Q1, and the source electrode of field effect transistor Q2 is connected to supply voltage Vbat, and the drain electrode of field effect transistor Q2 is connected to output voltage Vpwr; Schottky diode D1 is connected between OFF signal and the drain electrode of field effect transistor Q2;
Described key switch circuit comprises key switch S1 and resistance R4, and key switch S1 is connected between supply voltage Vbat and OFF signal, and resistance R4 is connected between OFF signal and ground.
2. load automatic start switch circuit as claimed in claim 1, is characterized in that, described Schottky diode D1 and key switch and power supply export and be formed by connecting.
3. load automatic start switch circuit as claimed in claim 1, it is characterized in that, described circuit load is formed by connecting by the grid of resistance R5 and P-MOS pipe.
4. load automatic start switch circuit as claimed in claim 1, it is characterized in that, described electric capacity C1 and electric capacity C2 is can modulating capacitor.
5. a firing circuit, is characterized in that, comprise as power 1-4 arbitrary as described in load automatic start switch circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520572256.XU CN205123700U (en) | 2015-07-29 | 2015-07-29 | Automatic starting switch circuit of load and firing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520572256.XU CN205123700U (en) | 2015-07-29 | 2015-07-29 | Automatic starting switch circuit of load and firing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205123700U true CN205123700U (en) | 2016-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520572256.XU Expired - Fee Related CN205123700U (en) | 2015-07-29 | 2015-07-29 | Automatic starting switch circuit of load and firing circuit |
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| Country | Link |
|---|---|
| CN (1) | CN205123700U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425835A (en) * | 2016-05-23 | 2017-12-01 | 中兴通讯股份有限公司 | A kind of on/off circuit |
-
2015
- 2015-07-29 CN CN201520572256.XU patent/CN205123700U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425835A (en) * | 2016-05-23 | 2017-12-01 | 中兴通讯股份有限公司 | A kind of on/off circuit |
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| Date | Code | Title | Description |
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| 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: 20160330 Termination date: 20190729 |
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| CF01 | Termination of patent right due to non-payment of annual fee |