CN204928783U - Switch control circuit - Google Patents
Switch control circuit Download PDFInfo
- Publication number
- CN204928783U CN204928783U CN201520563125.5U CN201520563125U CN204928783U CN 204928783 U CN204928783 U CN 204928783U CN 201520563125 U CN201520563125 U CN 201520563125U CN 204928783 U CN204928783 U CN 204928783U
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- resistance
- effect transistor
- field effect
- triode
- power
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- 230000005669 field effect Effects 0.000 claims abstract description 22
- 239000003990 capacitor Substances 0.000 claims description 20
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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Abstract
The utility model discloses a switch control circuit, it includes field effect transistor Q1, triode Q2, resistance R1 and resistance R3, power input end VIN is connected with resistance R3's A end, and resistance R3's B end is connected with triode Q2's base, triode Q2's emitter ground, and triode Q2's collecting electrode is connected with field effect transistor Q1's grid, and field effect transistor Q1's source electrode and power input hold VIN to be connected, and field effect transistor Q1's drain electrode and power output hold VOUT to be connected, resistance R3 A end still external messenger can hold EN, resistance R1 set up between field effect transistor Q1's grid and source electrode. The utility model discloses a switch control is realized to conventional device, and occupation space is little, stable performance, interference killing feature are strong, is applicable to multiple voltage and electric current.
Description
Technical field
The utility model relates to a kind of power on-off control circuit.
Background technology
Mains switch controls to be technology conventional in Power Management Design, uses more employing power supply chip EN to hold the mode controlling or use mains switch chip controls at present.As adopted MC94040 family chip to do Energy control, but this chip current only has 3A, and voltage range only has 1.7V ~ 5.5V, and cost is more expensive.Therefore need to design a kind of power on-off control circuit that can solve the problem.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of power on-off control circuit.
The purpose of this utility model is achieved through the following technical solutions: a kind of power on-off control circuit, and it comprises field effect transistor Q1, triode Q2, resistance R1 and resistance R3; Power input VIN holds with the A of resistance R3 and is connected, the B end of resistance R3 is connected with the base stage of triode Q2, the grounded emitter of triode Q2, the collector electrode of triode Q2 is connected with the grid of field effect transistor Q1, the source electrode of field effect transistor Q1 is connected with power input VIN, and the drain electrode of field effect transistor Q1 is connected with power output end VOUT; The A end also external Enable Pin EN of described resistance R3; Described resistance R1 is arranged between the grid of field effect transistor Q1 and source electrode.
A kind of power on-off control circuit also comprises a resistance R2; One end of described resistance R2 connects power input VIN, the A end of the other end contact resistance R3 of resistance R2 and the points of common connection of Enable Pin EN.
A kind of power on-off control circuit also comprises a resistance R4; The emitter of one end connecting triode Q2 of described resistance R4, the A end of the other end contact resistance R3 of resistance R4 and the points of common connection of Enable Pin EN.
A kind of power on-off control circuit also comprises a filter capacitor C1; One end of described filter capacitor C1 connects power input VIN, the other end ground connection of filter capacitor C1.
A kind of power on-off control circuit also comprises a filter capacitor C2; One end of described filter capacitor C21 connects power output end VOUT, the other end ground connection of filter capacitor C2.
The beneficial effects of the utility model are: the utility model uses a small amount of commonplace components to achieve the function of mains switch, has following advantage:
A, test through long-term complex environment, stable and reliable for performance, antijamming capability is strong.
The simple circuit that b, scheme relate to, takes up room little.
C, there is in product design general transplantability.Can be used for multiple voltage and electric current.
The all devices used in d, scheme are all conventional device, have the advantage of low cost.Global design is applicable to batch production and test.
Accompanying drawing explanation
Fig. 1 is the utility model circuit diagram.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail, but protection range of the present utility model is not limited to the following stated.
As shown in Figure 1, a kind of power on-off control circuit, it comprises field effect transistor Q1, triode Q2, resistance R1 and resistance R3; Power input VIN holds with the A of resistance R3 and is connected, the B end of resistance R3 is connected with the base stage of triode Q2, the grounded emitter of triode Q2, the collector electrode of triode Q2 is connected with the grid of field effect transistor Q1, the source electrode of field effect transistor Q1 is connected with power input VIN, and the drain electrode of field effect transistor Q1 is connected with power output end VOUT; The A end also external Enable Pin EN of described resistance R3; Described resistance R1 is arranged between the grid of field effect transistor Q1 and source electrode.Wherein, field effect transistor Q1 is P-channel enhancement type field effect transistor.Resistance R1 is conducting resistance.
A kind of power on-off control circuit also comprises a resistance R2; One end of described resistance R2 connects power input VIN, the A end of the other end contact resistance R3 of resistance R2 and the points of common connection of Enable Pin EN.
A kind of power on-off control circuit also comprises a resistance R4; The emitter of one end connecting triode Q2 of described resistance R4, the A end of the other end contact resistance R3 of resistance R4 and the points of common connection of Enable Pin EN.
A kind of power on-off control circuit also comprises a filter capacitor C1; One end of described filter capacitor C1 connects power input VIN, the other end ground connection of filter capacitor C1.
A kind of power on-off control circuit also comprises a filter capacitor C2; One end of described filter capacitor C21 connects power output end VOUT, the other end ground connection of filter capacitor C2.
Electric capacity C1 is the filter capacitor of power supply input, and C2 is the filter capacitor that power supply exports.
When EN end is input as high level, Q2 conducting, the voltage between the grid of field pipe Q1 and source electrode is less than 0, therefore Q1 conducting, namely mains switch is open mode; When EN end is input as low level, Q2 ends, and the voltage between the grid of field pipe Q1 and source electrode equals 0, therefore Q1 cut-off, namely mains switch is closed condition.
Resistance R2 and R4: if choosing dress R2, when EN is default, mains switch is often opened; If choosing dress R4, when EN is default, mains switch is normally closed.
Claims (5)
1. a power on-off control circuit, is characterized in that: it comprises field effect transistor Q1, triode Q2, resistance R1 and resistance R3; Power input VIN holds with the A of resistance R3 and is connected, the B end of resistance R3 is connected with the base stage of triode Q2, the grounded emitter of triode Q2, the collector electrode of triode Q2 is connected with the grid of field effect transistor Q1, the source electrode of field effect transistor Q1 is connected with power input VIN, and the drain electrode of field effect transistor Q1 is connected with power output end VOUT; The A end also external Enable Pin EN of described resistance R3; Described resistance R1 is arranged between the grid of field effect transistor Q1 and source electrode.
2. a kind of power on-off control circuit according to claim 1, is characterized in that: also comprise a resistance R2; One end of described resistance R2 connects power input VIN, the A end of the other end contact resistance R3 of resistance R2 and the points of common connection of Enable Pin EN.
3. a kind of power on-off control circuit according to claim 1, is characterized in that: also comprise a resistance R4; The emitter of one end connecting triode Q2 of described resistance R4, the A end of the other end contact resistance R3 of resistance R4 and the points of common connection of Enable Pin EN.
4. a kind of power on-off control circuit according to claim 1, is characterized in that: also comprise a filter capacitor C1; One end of described filter capacitor C1 connects power input VIN, the other end ground connection of filter capacitor C1.
5. a kind of power on-off control circuit according to claim 1, is characterized in that: also comprise a filter capacitor C2; One end of described filter capacitor C21 connects power output end VOUT, the other end ground connection of filter capacitor C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520563125.5U CN204928783U (en) | 2015-07-30 | 2015-07-30 | Switch control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520563125.5U CN204928783U (en) | 2015-07-30 | 2015-07-30 | Switch control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204928783U true CN204928783U (en) | 2015-12-30 |
Family
ID=54977878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520563125.5U Expired - Fee Related CN204928783U (en) | 2015-07-30 | 2015-07-30 | Switch control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204928783U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017202304A1 (en) * | 2016-05-23 | 2017-11-30 | 中兴通讯股份有限公司 | Start-up and shut-down circuit |
| CN107612534A (en) * | 2017-09-18 | 2018-01-19 | 深圳市沃特沃德股份有限公司 | On-off circuit and terminal device |
| CN107689733A (en) * | 2017-09-01 | 2018-02-13 | 壮都通信股份有限公司 | A kind of preservation method and electromagnetism fresh-keeping device |
| CN108969338A (en) * | 2018-06-07 | 2018-12-11 | 北京大学深圳医院 | External chest compression guidance device for cardiopulmonary resuscitation |
-
2015
- 2015-07-30 CN CN201520563125.5U patent/CN204928783U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017202304A1 (en) * | 2016-05-23 | 2017-11-30 | 中兴通讯股份有限公司 | Start-up and shut-down circuit |
| CN107689733A (en) * | 2017-09-01 | 2018-02-13 | 壮都通信股份有限公司 | A kind of preservation method and electromagnetism fresh-keeping device |
| CN107612534A (en) * | 2017-09-18 | 2018-01-19 | 深圳市沃特沃德股份有限公司 | On-off circuit and terminal device |
| WO2019051994A1 (en) * | 2017-09-18 | 2019-03-21 | 深圳市沃特沃德股份有限公司 | Switch circuit and terminal device |
| CN108969338A (en) * | 2018-06-07 | 2018-12-11 | 北京大学深圳医院 | External chest compression guidance device for cardiopulmonary resuscitation |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151230 |