CN107404314A - One key switch circuit and the supply unit with a key switch circuit - Google Patents

One key switch circuit and the supply unit with a key switch circuit Download PDF

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Publication number
CN107404314A
CN107404314A CN201610340445.3A CN201610340445A CN107404314A CN 107404314 A CN107404314 A CN 107404314A CN 201610340445 A CN201610340445 A CN 201610340445A CN 107404314 A CN107404314 A CN 107404314A
Authority
CN
China
Prior art keywords
transistor
key switch
end
voltage
control terminal
Prior art date
Application number
CN201610340445.3A
Other languages
Chinese (zh)
Inventor
刘福星
顾唯兵
崔铮
Original Assignee
中国科学院苏州纳米技术与纳米仿生研究所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 中国科学院苏州纳米技术与纳米仿生研究所 filed Critical 中国科学院苏州纳米技术与纳米仿生研究所
Priority to CN201610340445.3A priority Critical patent/CN107404314A/en
Publication of CN107404314A publication Critical patent/CN107404314A/en

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Classifications

    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96Touch switches
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/687Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors

Abstract

The present invention provides an a kind of key switch circuit,One key switch circuit includes the first transistor,Second transistor,Third transistor and key switch,The first transistor,Second transistor and second transistor include input,Output end and control terminal,Key switch includes first end and the second end,The input connection voltage input end of the first transistor,The output end connection voltage output end of the first transistor,The control terminal of the first transistor connects voltage input end by first resistor,The control terminal of the input connection the first transistor of second transistor,The output head grounding of second transistor,The first end of the control terminal connection key switch of second transistor,Second end of key switch passes through capacity earth,Second end of key switch also connects the control terminal of the first transistor by second resistance,Voltage output end connects the input of third transistor by 3rd resistor,The control terminal of the output end connection second transistor of transistor simultaneously passes through the 4th resistance eutral grounding.

Description

One key switch circuit and the supply unit with a key switch circuit

Technical field

The present invention relates to on-off circuit, more particularly to an a kind of key switch circuit and there is a key switch circuit Supply unit.

Background technology

With the development of electronic technology, electronic equipment it is small to household electrical appliance, shop equipment, greatly to Aero-Space, The application fields such as space exploration are more and more extensive, adapt to the switch kind of different application electronic equipment and environment therewith Class and form are also more and more.At present, mechanical switch and electronic cutting can be generally divided into by realizing the switch of circuit Close.

Mechanical switch realizes switching function using Mechanical Contact and disconnection, and shut-off voltage x current model can be opened by having Enclose wide, switchable direct current and exchange, non-standby current after shutdown, the advantages that circuit realiration is simple;But its Have the shortcomings that to switch that mechanical wear is larger, fragile, to be not easy to automatically control application, volume big, it has not been convenient to Operation.

The content of the invention

For overcome the deficiencies in the prior art, the present invention provides an a kind of key switch circuit of convenient operation and had The supply unit of one key switch circuit.

The present invention provides an a kind of key switch circuit, and a key switch circuit includes the first transistor, second Transistor, third transistor and key switch, the first transistor, the second transistor and described Two-transistor includes input, output end and control terminal, and the first transistor is the crystalline substance of low level conducting Body pipe, the second transistor are the transistor of high level conducting, and the key switch includes first end and the Two ends, the input connection voltage input end of the first transistor, the output end of the first transistor connect Voltage output end is connect, the control terminal of the first transistor connects the voltage input end by first resistor, The input of the second transistor connects the control terminal of the first transistor, the second transistor it is defeated Go out end ground connection, the control terminal of the second transistor connects the first end of the key switch, and the button is opened By capacity earth, the second end of the key switch also connects described the by second resistance at the second end closed The control terminal of one transistor, the voltage output end connect the input of the third transistor by 3rd resistor End, the output end of the third transistor connect the control terminal of the second transistor and connect by the 4th resistance Ground, the voltage input end be used for receive supply voltage and it is described pressing switch press after output voltage to institute Voltage output end is stated, the voltage output end is used to connect load circuit, the control terminal of the third transistor For being received after the voltage input end output voltage gives the voltage output end from the load circuit Control signal and turn on third transistor.

Further, the control terminal of the third transistor passes through the 5th resistance eutral grounding, the third transistor For the transistor of high level conducting.

Further, the third transistor is N-type FET, and the control terminal of the third transistor is The grid of the N-type FET, the input of the third transistor are the leakage of the N-type FET Pole, the output end of the third transistor are the source electrode of the N-type FET.

Further, the first transistor is p-type FET, and the control terminal of the first transistor is The grid of the p-type FET, the input of the first transistor are the leakage of the p-type FET Pole, the output end of the first transistor are the source electrode of the p-type FET.

Further, the second transistor is N-type FET, and the control terminal of the second transistor is The grid of the N-type FET, the input of the second transistor are the leakage of the N-type FET Pole, the output end of the second transistor are the source electrode of the N-type FET.

The present invention also provides a kind of supply unit, and the supply unit includes an above-mentioned key switch circuit.

Further, the supply unit also includes power supply, and the power supply connects the voltage input end and is used for The supply voltage is provided.

Further, the supply unit also includes the load circuit, and the load circuit includes single-chip microcomputer, The control terminal that the single-chip microcomputer connects the third transistor is used in the voltage input end output voltage to institute The control signal is exported after stating voltage output end.

Beneficial effects of the present invention:One key switch circuit includes three transistors and by compressing switch, described After pressing switch press, the control terminal of electric capacity and second transistor connects and it is powered, second transistor Control terminal is changed into high level, turns on second transistor;Second transistor turns on the control for making the first transistor End is grounded and is changed into low level, so that the first transistor turns on;The first transistor conducting makes voltage input end To be connected with voltage output end, third transistor is used to receive to be turned on from the control signal of load circuit, with The control terminal of second transistor after release button is set to keep high level, so that a whole key switch circuit is in Conducting state, when needing to turn off a key switch circuit, pressing the key switch can turn off, operation letter Folk prescription is just.

Brief description of the drawings

Fig. 1 is the circuit connection diagram of a key switch circuit better embodiment of the invention.

Fig. 2 be a key switch circuit better embodiment of supply unit of the present invention press in the off case by The schematic diagram of key switch moment.

Fig. 3 be supply unit of the present invention a key switch circuit better embodiment in the off case persistently by Press the schematic diagram of key switch.

Fig. 4 is that a key switch circuit better embodiment of supply unit of the present invention is unclamped button after opening and opened The schematic diagram of pass.

Fig. 5 is that key switch circuit better embodiment pressing keys after opening of supply unit of the present invention are opened The schematic diagram of the moment of pass.

Fig. 6 be supply unit of the present invention a key switch circuit better embodiment after shut-off Continued depression by The schematic diagram of key switch.

Embodiment

Below, various embodiments of the present invention will be described in detail with reference to accompanying drawing.

Referring to Fig. 1, the better embodiment of supply unit of the present invention includes a key switch circuit 100, power supply And load circuit, a key switch circuit 100 include the first transistor, second transistor, the 3rd crystal Pipe and key switch S.The load circuit includes single-chip microcomputer.

The first transistor, the second transistor and the second transistor include input, output End and control terminal, the first transistor are the transistor of low level conducting, the second transistor and described Third transistor is the transistor of high level conducting.In the present embodiment, the first transistor is p-type Channel field-effect pipe QP1, the second transistor are N-type channel FET QN2, the 3rd crystal Manage as N-type channel FET QN3, the input, output end of three transistors and control terminal difference For drain electrode, source electrode, grid.

The key switch S includes the end 104 of first end 105 and second, the P-type channel FET QP1 Drain electrode 101 connect voltage input end Vin, the source electrode 102 of the P-type channel FET QP1 connects Voltage output end Vout, the P-type channel FET QP1 grid 103 pass through resistance R1 connections institute Voltage input end Vin is stated, the drain electrode 106 of the N-type channel FET QN2 connects the P-type channel FET QP1 grid 103, the source ground of the N-type channel FET QN2, the N Type channel field-effect pipe QN2 grid 107 connects the first end 105 of the key switch S, the button Switch S the second end 104 is grounded by electric capacity C1.The second end 104 of the key switch S also passes through electricity R2 connections P-type channel FET QP1 grid 103 is hindered, the voltage output end Vout passes through Resistance R3 connections N-type channel FET QN3 drain electrode, the N-type channel FET QN3 Source electrode connect the grid of the N-type channel FET QN2 and be grounded by resistance R4.The N-type Channel field-effect pipe QN3 grid 108 is grounded by resistance R5, the N-type channel FET QN3 Grid 108 be also connected with the pin IO of single-chip microcomputer.

The voltage input end Vin be used for receive the power supply supply voltage and it is described by compress switch S by Output voltage gives the voltage output end Vout after pressure.The voltage output end Vout connections load circuit (figure is to show), the single-chip microcomputer are located in the load circuit.When the voltage output end Vout is to described When load circuit is powered, the pin IO of the single-chip microcomputer sends the control signal of high level to the N-type channel FET QN3 grid 108 is to turn on the N-type channel FET QN3.

In the present embodiment, the DC voltage that the voltage input end Vin is received is 5V, the voltage output The voltage of end output is 5V;All resistance is metal film resistor, and resistance R1, R3, R5 are preferred Value 20K, resistance R4 preferred value 30K, resistance R2 preferred values 200K;Electric capacity C1 is ROHS, electricity It is 3.3uF to hold C1 preferred values.

Fig. 1, Fig. 2 and Fig. 3 are referred to, in off state, FET QP1, QN2, QN3 locate In off state, the now voltage at the second end 104 of the key switch S and P-type channel FET QP1 Grid 103 it is identical, be high level;Described N-type channel FET QN2, QN3 grid lead to respectively Resistance R4, R5 ground connection are crossed, is low level.Push button switch S moment, the N-type channel field effect Should pipe QN2 grid 107 be connected by the key switch S with the 104 of the electric capacity C1, the electricity Hold C1 to power the FET QN2 and turn on the FET QN2;The P-type channel field Effect pipe QP1 grid 103 is grounded by the N-type channel FET QN2 to be changed into low level, Voltage input end Vin is set to power the voltage output end Vout so as to turn on.The voltage output end Vout After being powered to the load circuit, the pin IO of the single-chip microcomputer sends the control signal of high level to institute N-type channel FET QN3 grid 108 is stated to turn on the N-type channel FET QN3;This When key switch S described in sustained hold, Vout*R2//R4/ (R2//R4+R3) be 2.8V be more than the N-type ditch Road FET QN2's fully opens voltage 2.5V, and the N-type channel FET QN2 is persistently led It is logical, opening state is locked, as shown in figure 3, the key switch S is unclamped, by R4/ (R4+R3) * Vout For 3V voltage 2.5V, the N-type channel field-effect are fully opened more than N-type channel FET QN2 Pipe QN2 constant conductions, lock opening state.

Fig. 4 to Fig. 6 is referred to, in opening state, described transistor QP1, QN2, QN3 are all in leading The grid of logical state, now the second end 104 and P-type channel FET QP1 of the key switch S Pole 103 is identical, is low level;The voltage of the grid 107 of the N-type channel FET QN2: R4/ (R4+R3) * Vout are that 3V fully opens voltage 2.5V more than the N-type channel FET QN2, For high level;The grid 108 of the N-type channel FET QN3 receives the pin IO of the single-chip microcomputer The control signal of high level is sent, is high level.The moment of the key switch S is pressed, such as Fig. 5 institutes Show, the grid 107 of the N-type channel FET QN2 passes through the key switch S and the electric capacity C1 is connected, and is changed into low level, the N-type channel FET QN2 shut-offs;The N-type channel field effect Should pipe QN2 shut-offs, the electric capacity C1 charge by described resistance R1, R2, and the P-type channel field is imitated Should pipe QP1 grid 103 voltage:Vin*R2/ (R1+R2) is that 4.2V is more than the P-type channel field-effect Pipe QP1's complete switches off voltage 2.5V, the P-type channel FET QP1 shut-offs, the control source Vin is held to stop powering to the load circuit.

After power remove, the pin IO of the single-chip microcomputer does not have high level signal to send, the N-type channel field Effect pipe QN3 grid 108 is low level by resistance R5 drop-downs, the N-type channel FET QN3 Shut-off.If Continued depression key switch S, lead to as shown in fig. 6, resistance R1, R2, R4 form series connection Road, and be by the voltage of the grid 103 of the P-type channel FET QP1:Vin*(R2+R4) / (R1+R2+R4) is equal to 4.6V, and voltage is complete switched off more than the P-type channel FET QP1 2.5V, therefore the P-type channel FET QP1 continues to turn off, the N-type channel FET QN2 The voltage of grid 107 be:Vin*R4/ (R1+R2+R4) is equal to 0.6V, less than the N-type channel FET QN2's complete switches off voltage 0.7V, therefore the N-type channel FET QN2 is turned off, Continued depression The key switch S will not also be such that power supply is connected with load.Unclamp the key switch S, FET QP1, QN2, QN3 are all in off state.

When voltage input end Vin can not be to load circuit normal power supply, the N-type channel FET QN3 grid 108 is pulled down by resistor R5 and turned off for low level.Press the wink of the key switch S Between, as shown in Fig. 2 because the N-type channel FET QN3 is turned off, the N-type channel field-effect Pipe QN2 grid 107 is at once low level by resistor R4 drop-downs, the N-type channel FET QN2 Shut-off, the grid 103 of the P-type channel FET QP1 is pulled up by resistance R1 to be turned off for high level; If Continued depression key switch S, the electric capacity C1 is discharged rapidly by resistance R2, R4, and is entered Enter shut-off lock-out state as shown in Figure 6.

Although the present invention has shown and described with reference to specific embodiment, those skilled in the art will Understand:In the case where not departing from the spirit and scope of the present invention limited by claim and its equivalent, The various change in form and details can be carried out herein.

Claims (8)

  1. An a kind of 1. key switch circuit, it is characterised in that a key switch circuit include the first transistor, Second transistor, third transistor and key switch, the first transistor, the second transistor and institute Stating second transistor includes input, output end and control terminal, and the first transistor turns on for low level Transistor, the second transistor is the transistor of high level conducting, and the key switch includes first end And second end, the input connection voltage input end of the first transistor, the output of the first transistor End connection voltage output end, the control terminal of the first transistor connect the control source by first resistor End, the input of the second transistor connect the control terminal of the first transistor, the second transistor Output head grounding, the control terminal of the second transistor connects the first end of the key switch, described to press Second end of key switch also connects institute by capacity earth, the second end of the key switch by second resistance The control terminal of the first transistor is stated, the voltage output end connects the third transistor by 3rd resistor Input, the output end of the third transistor connect the control terminal of the second transistor and by the 4th electricity Resistance ground connection, the voltage input end are used to receive supply voltage and the output voltage after the pressing switch press To the voltage output end, the voltage output end is used to connect load circuit, the control of the third transistor End processed is used to after the voltage input end output voltage is to the voltage output end receive from the load electricity The control signal on road and turn on third transistor.
  2. A 2. key switch circuit according to claim 1, it is characterised in that the third transistor For control terminal by the 5th resistance eutral grounding, the third transistor is the transistor of high level conducting.
  3. A 3. key switch circuit according to claim 2, it is characterised in that the third transistor is N-type FET, the control terminal of the third transistor are the grid of the N-type FET, described the The input of three transistors is the drain electrode of the N-type FET, and the output end of the third transistor is institute State the source electrode of N-type FET.
  4. A 4. key switch circuit according to claim 1, it is characterised in that the first transistor is P-type FET, the control terminal of the first transistor are the grid of the p-type FET, described first The input of transistor is the drain electrode of the p-type FET, and the output end of the first transistor is the P The source electrode of type FET.
  5. A 5. key switch circuit according to claim 1, it is characterised in that the second transistor is N-type FET, the control terminal of the second transistor are the grid of the N-type FET, described the The input of two-transistor is the drain electrode of the N-type FET, and the output end of the second transistor is institute State the source electrode of N-type FET.
  6. 6. a kind of supply unit, is characterised by, the supply unit includes any one of claim 1 to 5 One key switch circuit.
  7. 7. supply unit according to claim 6, it is characterised in that the supply unit also includes electricity Source, the power supply connect the voltage input end and are used to provide the supply voltage.
  8. 8. supply unit according to claim 6, it is characterised in that the supply unit also includes institute Load circuit is stated, the load circuit includes single-chip microcomputer, and the single-chip microcomputer connects the control of the third transistor End processed is used to export the control signal after the voltage input end output voltage is to the voltage output end.
CN201610340445.3A 2016-05-20 2016-05-20 One key switch circuit and the supply unit with a key switch circuit CN107404314A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610340445.3A CN107404314A (en) 2016-05-20 2016-05-20 One key switch circuit and the supply unit with a key switch circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610340445.3A CN107404314A (en) 2016-05-20 2016-05-20 One key switch circuit and the supply unit with a key switch circuit

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CN107404314A true CN107404314A (en) 2017-11-28

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108933585A (en) * 2018-07-05 2018-12-04 科沃斯机器人股份有限公司 A kind of active circuit and dust catcher

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070235754A1 (en) * 2006-04-06 2007-10-11 Nec Electronics Corporation Electronic switch circuit
US20100019829A1 (en) * 2008-07-28 2010-01-28 Cegnar Erik J Turn on-off power circuit for digital systems
CN201516033U (en) * 2009-09-22 2010-06-30 武汉力源信息技术股份有限公司 Power supply soft switching circuit of fingertip pulse oximeter
CN202395885U (en) * 2011-12-20 2012-08-22 Tcl集团股份有限公司 Power switch and television set
CN102664612A (en) * 2012-04-26 2012-09-12 深圳众为兴技术股份有限公司 Control device for automatic disconnection of power switch triggered at one time
CN203434954U (en) * 2013-07-29 2014-02-12 青岛海信移动通信技术股份有限公司 Switching circuit with adjustable rise time and digital product
CN205249167U (en) * 2015-12-24 2016-05-18 深圳市拓普泰克电子有限公司 Switch circuit and electronic equipment

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070235754A1 (en) * 2006-04-06 2007-10-11 Nec Electronics Corporation Electronic switch circuit
US20100019829A1 (en) * 2008-07-28 2010-01-28 Cegnar Erik J Turn on-off power circuit for digital systems
CN201516033U (en) * 2009-09-22 2010-06-30 武汉力源信息技术股份有限公司 Power supply soft switching circuit of fingertip pulse oximeter
CN202395885U (en) * 2011-12-20 2012-08-22 Tcl集团股份有限公司 Power switch and television set
CN102664612A (en) * 2012-04-26 2012-09-12 深圳众为兴技术股份有限公司 Control device for automatic disconnection of power switch triggered at one time
CN203434954U (en) * 2013-07-29 2014-02-12 青岛海信移动通信技术股份有限公司 Switching circuit with adjustable rise time and digital product
CN205249167U (en) * 2015-12-24 2016-05-18 深圳市拓普泰克电子有限公司 Switch circuit and electronic equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108933585A (en) * 2018-07-05 2018-12-04 科沃斯机器人股份有限公司 A kind of active circuit and dust catcher

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