CN207010642U - Key switch circuit - Google Patents
Key switch circuit Download PDFInfo
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- CN207010642U CN207010642U CN201720689475.5U CN201720689475U CN207010642U CN 207010642 U CN207010642 U CN 207010642U CN 201720689475 U CN201720689475 U CN 201720689475U CN 207010642 U CN207010642 U CN 207010642U
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Abstract
The utility model discloses a kind of key switch circuit, belong to medical instruments field.The circuit includes button, electric capacity, several resistance, metal-oxide-semiconductor and triode；The source electrode connection power end of metal-oxide-semiconductor, the drain electrode of metal-oxide-semiconductor are connected by first resistor and second resistance and the base stage of triode；The drain electrode of metal-oxide-semiconductor and the output end that the common port of first resistor is key switch circuit, are parallel with 3rd resistor between the source electrode of metal-oxide-semiconductor and the grid of metal-oxide-semiconductor, the grid of metal-oxide-semiconductor and the colelctor electrode of triode connect；One end of button is connected by second resistance and the base stage of triode, and the other end of button is connected by the grid of the 4th resistance and metal-oxide-semiconductor；The grounded emitter of triode；4th resistance connects one end of electric capacity, the other end ground connection of electric capacity with the common port of button；Solve the problems, such as that the mechanical switch volume in medical treatment electronic equipment causes greatly easy maloperation；The reliability for improving switch, cost-effective effect are reached.
Description
Technical field
The utility model embodiment is related in medical instruments field, more particularly to a kind of key switch circuit.
Background technology
In medical treatment electronic equipment, typically mechanical switch or MCU (Microcontroller Unit, micro-control are used
Unit processed) controlling switch control electronics power supply switch.But mechanical switch volume is big, easily send out in use
Raw maloperation, and the cost of manufacture of MCU controlling switches is high.
Utility model content
In order to solve problem of the prior art, the utility model embodiment provides a kind of key switch circuit.The technology
Scheme is as follows：
First aspect, there is provided a kind of key switch circuit, the circuit include button, electric capacity, several resistance, metal oxygen
Compound semiconductor MOS pipe and triode；
The source electrode connection power end of the metal-oxide-semiconductor, the drain electrode of the metal-oxide-semiconductor by first resistor and second resistance with it is described
The base stage connection of triode；
The drain electrode of the metal-oxide-semiconductor and the output end that the common port of the first resistor is the key switch circuit, it is described
Be parallel with 3rd resistor between the grid of the source electrode of metal-oxide-semiconductor and the metal-oxide-semiconductor, the grid of the metal-oxide-semiconductor also with the triode
Colelctor electrode connection；
One end of the button is connected by the second resistance with the base stage of the triode, the other end of the button
It is connected by the 4th resistance with the grid of the metal-oxide-semiconductor；
The grounded emitter of the triode；
4th resistance connects one end of the electric capacity, another termination of the electric capacity with the common port of the button
Ground.
Optionally, the ratio of the resistance of the 4th resistance and the resistance of the 3rd resistor meets predetermined condition.
The beneficial effect brought of technical scheme that the utility model embodiment provides is：
By electric capacity, button, metal-oxide-semiconductor and triode, the triode ON when button is pressed, metal-oxide-semiconductor conducting, electricity is utilized
Resistance forms self-locking structure, keeps the conducting state of triode and metal-oxide-semiconductor, start is realized, when button is pressed again due to electricity
Electric charge in appearance is discharged, and triode cut-off, due to undertension to maintain metal-oxide-semiconductor to turn on, realizes shutdown；Solves medical electric
The problem of mechanical switch volume in sub- equipment causes greatly easy maloperation；Reach and improved the reliability of switch, save cost
Effect.
The switching on and shutting down for realizing power supply using the flash-over characteristic of metal-oxide-semiconductor, triode and electric capacity act on, and are opened compared to MUC controls
Close, reduce production cost, in turn ensure that the security and validity of power switch function.
Brief description of the drawings
, below will be to needed for embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
The accompanying drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some realities of the present utility model
Example is applied, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is a kind of circuit theory diagrams of key switch circuit according to an exemplary embodiment.
Embodiment
It is new to this practicality below in conjunction with accompanying drawing to make the purpose of this utility model, technical scheme and advantage clearer
Type embodiment is described in further detail.
Fig. 1 is refer to, the circuit theory diagrams of the key switch circuit provided it illustrates the utility model one embodiment.
The button open on-off circuit include button, electric capacity, several resistance, MOS (metal-oxide-semiconductor, metal-
Oxidc-Semiconductor) pipe and triode.
As shown in figure 1, metal-oxide-semiconductor Q1 source electrode connection power end Vin, metal-oxide-semiconductor Q1 drain electrode passes through first resistor R1 and the
Two resistance R2 are connected with triode Q2 base stage.
Metal-oxide-semiconductor Q1 drain electrode and the output end vo ut that first resistor R1 common port is key switch circuit, metal-oxide-semiconductor Q1's
Colelctor electrode of 3rd resistor R3, metal-oxide-semiconductor the Q1 grid also with triode Q2 is parallel between source electrode and metal-oxide-semiconductor Q1 grid to connect
Connect.
The power end of the output end vo ut connection electronic equipments of key switch circuit, when output end vo ut output voltages,
The electronic equipment start being connected with the key switch circuit, when output end vo ut not output voltages, with the key switch circuit
The electronic equipment shutdown of connection.
Optionally, electronic equipment is medical treatment electronic equipment.
Button SW one end is connected by second resistance R2 with triode Q2 base stage, and the button SW other end passes through the 4th
Resistance R4 is connected with metal-oxide-semiconductor Q1 grid.
Triode Q2 grounded emitter.
4th resistance R4 connects electric capacity C1 one end, electric capacity C1 other end ground connection with button SW common port.
Optionally, the ratio of the resistance of the resistance of the 4th resistance and 3rd resistor meets predetermined condition.
The resistance of 4th resistance is much larger than the resistance of 3rd resistor.Such as the 4th resistance resistance be 3rd resistor resistance
49 times.
Assuming that the resistance that Vin=3V in Fig. 1, R1 resistance are 500k Ω, R2 is 200 Ω, R3 resistance is 100k Ω, R4
Resistance be 4.99M Ω, metal-oxide-semiconductor Q1 model AO3415.
When button SW is not pressed, electric capacity C1 has the voltage more than 2V.
Start：Button SW is being pressed moment, and the voltage at second resistance R2 is the voltage at electric capacity C1, namely triode Q2
Base stage obtains the voltage more than 0.7V, triode Q2 conductings, and triode Q2 causes metal-oxide-semiconductor Q1 level to move ground, metal-oxide-semiconductor to
Q1 is turned on, output end vo ut output 3V voltages；Now, first resistor R1 plays self-locking action, when metal-oxide-semiconductor Q1 is turned on, triode Q2
It is held on；Now, the electronic equipment start being connected with the key switch circuit.
In output end vo ut output voltages, the electronic equipment being connected with the key switch circuit is started shooting, and electronic equipment is opened
After machine, the electric charge on electric capacity C1 can be discharged by the 4th resistance R4 and triode Q2, and the electric charge on electric capacity C1 can be in very short time
Inside discharge.
Shutdown：SW is pushed button again, because electric capacity C1 is in zero point position, equivalent to short circuit triode Q2 BE
Knot, after triode Q2 cut-offs, power supply is charged to electric capacity C1 again by 3rd resistor R3 and the 4th resistance R4, due to 3rd resistor
The ratio very little of R3 resistance and the 4th resistance R4 resistance, the undertension on 3rd resistor R3 to maintain metal-oxide-semiconductor Q1 to turn on,
Metal-oxide-semiconductor Q1 ends, and output end vo ut not shut down by output voltage, the case equipment being connected with the key switch circuit.
The key switch circuit that the utility model embodiment provides, even if the start of long-press button or the shutdown of long-press button, are pressed
Key switch circuit can normal work, low-frequency oscillation will not occur.
In summary, the key switch circuit that the utility model embodiment provides, passes through electric capacity, button, metal-oxide-semiconductor and three poles
Pipe, the triode ON when button is pressed, metal-oxide-semiconductor conducting, self-locking structure is formed using resistance, keeps triode and metal-oxide-semiconductor
Conducting state, realize start, when button is pressed again because the electric charge on electric capacity is discharged, triode cut-off, due to
Undertension realizes shutdown to maintain metal-oxide-semiconductor to turn on；Solving mechanical switch volume in medical treatment electronic equipment causes easily to miss greatly
The problem of operation；The reliability for improving switch, cost-effective effect are reached.
The switching on and shutting down for realizing power supply using the flash-over characteristic of metal-oxide-semiconductor, triode and electric capacity act on, and are opened compared to MUC controls
Close, reduce production cost, in turn ensure that the security and validity of power switch function.
It should be noted that：Above-mentioned utility model embodiment sequence number is for illustration only, does not represent the quality of embodiment.
Preferred embodiment of the present utility model is the foregoing is only, it is all in this practicality not to limit the utility model
Within new spirit and principle, any modification, equivalent substitution and improvements made etc., guarantor of the present utility model should be included in
Within the scope of shield.
Claims (2)
1. a kind of key switch circuit, it is characterised in that the circuit includes button, electric capacity, several resistance, metal oxide
Semiconductor MOS pipe and triode；
The source electrode connection power end of the metal-oxide-semiconductor, the drain electrode of the metal-oxide-semiconductor pass through first resistor and second resistance and three pole
The base stage connection of pipe；
The drain electrode of the metal-oxide-semiconductor and the output end that the common port of the first resistor is the key switch circuit, the metal-oxide-semiconductor
Source electrode and the metal-oxide-semiconductor grid between be parallel with 3rd resistor, the current collection of the grid of the metal-oxide-semiconductor also with the triode
Pole connects；
One end of the button is connected by the second resistance with the base stage of the triode, and the other end of the button passes through
4th resistance is connected with the grid of the metal-oxide-semiconductor；
The grounded emitter of the triode；
4th resistance connects one end of the electric capacity, the other end ground connection of the electric capacity with the common port of the button.
2. key switch circuit according to claim 1, it is characterised in that the resistance of the 4th resistance is the described 3rd
49 times of the resistance of resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720689475.5U CN207010642U (en) | 2017-06-14 | 2017-06-14 | Key switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720689475.5U CN207010642U (en) | 2017-06-14 | 2017-06-14 | Key switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207010642U true CN207010642U (en) | 2018-02-13 |
Family
ID=61446742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720689475.5U Active CN207010642U (en) | 2017-06-14 | 2017-06-14 | Key switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207010642U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108649940A (en) * | 2018-05-16 | 2018-10-12 | 四川斐讯信息技术有限公司 | A kind of singly-bound power on-off control circuit and its control method |
| CN109831195A (en) * | 2019-01-29 | 2019-05-31 | 维沃移动通信有限公司 | Key control circuit and mobile terminal |
| CN109901689A (en) * | 2019-01-29 | 2019-06-18 | 珠海市杰理科技股份有限公司 | Hardware switch circuit |
| CN110380714A (en) * | 2019-07-12 | 2019-10-25 | 广州视源电子科技股份有限公司 | Key self-locking switch circuit and electronic equipment |
-
2017
- 2017-06-14 CN CN201720689475.5U patent/CN207010642U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108649940A (en) * | 2018-05-16 | 2018-10-12 | 四川斐讯信息技术有限公司 | A kind of singly-bound power on-off control circuit and its control method |
| CN108649940B (en) * | 2018-05-16 | 2022-01-14 | 哈尔滨宇龙自动化有限公司 | Single-key power switch control circuit and control method thereof |
| CN109831195A (en) * | 2019-01-29 | 2019-05-31 | 维沃移动通信有限公司 | Key control circuit and mobile terminal |
| CN109901689A (en) * | 2019-01-29 | 2019-06-18 | 珠海市杰理科技股份有限公司 | Hardware switch circuit |
| CN109901689B (en) * | 2019-01-29 | 2021-10-12 | 珠海市杰理科技股份有限公司 | Hardware switch circuit |
| CN109831195B (en) * | 2019-01-29 | 2023-12-12 | 维沃移动通信有限公司 | Key control circuit and mobile terminal |
| CN110380714A (en) * | 2019-07-12 | 2019-10-25 | 广州视源电子科技股份有限公司 | Key self-locking switch circuit and electronic equipment |
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