CN207504837U - A kind of power switch disappears twitter circuit - Google Patents
A kind of power switch disappears twitter circuit Download PDFInfo
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- CN207504837U CN207504837U CN201721302753.3U CN201721302753U CN207504837U CN 207504837 U CN207504837 U CN 207504837U CN 201721302753 U CN201721302753 U CN 201721302753U CN 207504837 U CN207504837 U CN 207504837U
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Abstract
The utility model provides a kind of power switch and disappears twitter circuit, including power supply, switching circuit, linear power supply, be delayed comparison circuit, metal-oxide-semiconductor driving circuit and metal-oxide-semiconductor, power supply is powered by switching circuit to linear power supply, linear power supply is to comparison circuit and metal-oxide-semiconductor drive circuitry, comparison circuit exports a control signal to metal-oxide-semiconductor driving circuit, to open metal-oxide-semiconductor, so as to power to the load, the utility model circuit for eliminating button presses the saltus step that the shake generated in the process causes load power source, static discharge has been blocked by button to the path of metal-oxide-semiconductor, metal-oxide-semiconductor is protected not to be damaged by static electricity.
Description
Technical field
Disappear twitter circuit the utility model is related to a kind of power switch circuit more particularly to a kind of power switch.
Background technology
The total power switch of electronic product is mostly by mechanical switch (button or rotation key) and relay currently on the market
Device or contactor are composed, and mechanical switch generates the actuation or disconnection of control signal control relay or contacts of contactor, so
And mechanical switch, contactor or relay be during action, can all generate shake, this shake can reduce contactor or after
The service life of electric appliance, while impact can be generated to load.
Utility model content
The problem of the utility model is deposited for the above-mentioned prior art provides a kind of power switch and disappears twitter circuit.
Power switch described in the utility model disappear twitter circuit include power supply, switching circuit, linear power supply, delay it is more electric
Road, metal-oxide-semiconductor driving circuit and metal-oxide-semiconductor, power supply by switching circuit to linear power supply power, linear power supply to delay comparison circuit
With metal-oxide-semiconductor drive circuitry, delay comparison circuit exports a control signal to metal-oxide-semiconductor driving circuit, to open metal-oxide-semiconductor,
It powers to the load；Switching circuit is produced during mechanical switch is avoided to act by the way of capacitance is connected with transistor collector
Influence of the raw shake to linear power supply output voltage；Comparison circuit be delayed by the way that comparator homophase input voltage is controlled to be later than instead
Phase input voltage reaches setting value, exports the break-make of stable control signal control power supply master switch metal-oxide-semiconductor；
The switching circuit includes triode, resistance, capacitance and button switch, and triode is PNP triode, triode
Emitter is connected to power supply, and collector is connected to capacitance and linear power supply, and base stage is connected to one end of resistance, the other end of resistance
One end of button switch is connected to, capacitance one end is connected to linear power supply, and the other end is connected to ground terminal, the other end of button switch
It is connected to ground terminal；
Switching circuit provides an input power to linear power supply, itself shake in action process due to button switch
Characteristic causes the base stage of triode jitter phenomenon occur, is shaken so as to cause transistor collector output voltage, input electricity
Source can be there are of short duration wild effect, and after button switch is closed completely, which enters stable state, due to delay
Comparison circuit and metal-oxide-semiconductor driving circuit it is low in energy consumption, so the output current of linear power supply is small, select suitable output capacitance,
So that the jitter amplitude of transistor collector output voltage becomes smaller, the shake generated during being acted to avoid button switch
Influence to linear power supply output voltage.
The delay comparison circuit includes first resistor, second resistance, 3rd resistor, the first capacitance, the second capacitance and ratio
Compared with device, one end of first resistor is connected to the output of linear power supply, and the other end is connected to the same of comparator together with the second capacitance
Phase input terminal, the other end of the second capacitance are connected to the ground terminal of linear power supply, and one end of second resistance is connected to linear power supply
Output terminal, the other end are connected to the inverting input of comparator together with 3rd resistor and the first capacitance, 3rd resistor it is another
End is connected to ground terminal together with the other end of the first capacitance, the effect of the comparison circuit that is delayed be to the switching signal of button switch into
Control signal is generated after the delay that hundred milliseconds of line number, which controls the break-make of metal-oxide-semiconductor；
The voltage all the way that linear power supply 3 exports is input to after the partial pressure of resistance 32 and 33 using the filtering of capacitance 34 to be compared
The inverting input of device 36, the another way voltage that linear power supply 3 exports are defeated by the delay circuit that resistance 31 and capacitance 35 are formed
Enter the in-phase input end to comparator 36, by adjusting resistance 31,32,33 and the parameter value of capacitance 34,35 so that comparator
36 homophase input voltage is later than reverse inter-input-ing voltage and reaches setting value, when homophase input voltage is higher than reverse inter-input-ing voltage,
Comparator 36 exports high level, and high level control metal-oxide-semiconductor driving circuit 5 is connected metal-oxide-semiconductor 6, is powered on to load 7.
The utility model eliminates button and presses the saltus step that the shake generated in the process causes load power source, has blocked electrostatic
Electric discharge, to the path of metal-oxide-semiconductor, protects metal-oxide-semiconductor not to be damaged by static electricity by button.
Description of the drawings
Fig. 1 is the utility model circuit structure block diagram；
Fig. 2 is switching circuit structure figure；
Fig. 3 is delay comparison circuit structure chart；
In figure：1-power supply；2-switching circuit；3-linear power supply；4-delay comparison circuit；5-metal-oxide-semiconductor driving electricity
Road；6-metal-oxide-semiconductor；7-load；21-triode；22-resistance；23-capacitance；24- button switches；31-first resistor；
32-second resistance；33-3rd resistor；34-the first capacitance；35-the second capacitance；36-comparator.
Specific embodiment
Circuit described in the utility model is mainly used for eliminating shake when power switch is turned on and off.
As shown in Figure 1, power switch described in the utility model disappears twitter circuit power supply 1, switching circuit 2, linear power supply 3, prolong
When comparison circuit 4, metal-oxide-semiconductor driving circuit 5 and metal-oxide-semiconductor 6, power supply 1 powered to linear power supply 3 by switching circuit 2, linear electricity
Source 3 powers to delay comparison circuit 4 and metal-oxide-semiconductor driving circuit 5, and delay comparison circuit 4 exports a control signal and driven to metal-oxide-semiconductor
Dynamic circuit 5, to open metal-oxide-semiconductor 6, to 7 power supply of load.
As shown in Fig. 2, switching circuit 2 includes triode 21, resistance 22, capacitance 23 and button switch 24, triode 21 is
PNP triode, the emitter of triode 21 are connected to power supply 1, and collector is connected to capacitance 23 and linear power supply 3, base stage connection
To one end of resistance 22, the other end of resistance 22 is connected to one end of button switch 24, and 23 one end of capacitance is connected to linear power supply
3, the other end is connected to ground terminal, and the other end of button switch 24 is connected to ground terminal.
As shown in figure 3, delay comparison circuit 4 includes first resistor 31, second resistance 32,3rd resistor 33, the first capacitance
34th, the second capacitance 35 and comparator 36, one end of first resistor 31 are connected to the output of linear power supply 3, the other end and the second electricity
Holding 35 in-phase input ends for being connected to comparator 36 together, the other end of the second capacitance 35 is connected to the ground terminal of linear power supply 3,
One end of second resistance 32 is connected to the output terminal of linear power supply 3, and the other end connects together with 33 and first capacitance 34 of 3rd resistor
The inverting input of comparator 36 is connected to, the other end of 3rd resistor 33 is connected to ground together with the other end of the first capacitance 34
End, the effect for the comparison circuit that is delayed are to generate control letter after hundreds of milliseconds of delay is carried out to the switching signal of button switch 24
Number, the break-make of the control signal control power supply master switch metal-oxide-semiconductor 6.
The circuit course of work described in the utility model is as follows：
When product powers on, button switch 24 is pressed, and switching circuit 2 provides an input power to linear power supply 3, due to
The characteristic that button switch is shaken in itself causes the base stage of triode 21 jitter phenomenon occur, so as to cause 21 collector of triode
Output voltage is shaken, and input power can there are of short duration wild effects, after button switch 24 is closed completely, the input
Power supply enters stable state, due to delay comparison circuit 4 and metal-oxide-semiconductor driving circuit 5 it is low in energy consumption, so linear power supply 3 is defeated
It is small to go out electric current, selects suitable output capacitance 23 so that the jitter amplitude of transistor collector output voltage becomes smaller, can be to avoid
Influence of the shake that button switch 24 generates during acting to 3 output voltage of linear power supply.
The voltage all the way that linear power supply 3 exports is input to after the partial pressure of resistance 32 and 33 using the filtering of capacitance 34 to be compared
The inverting input of device 36, the another way voltage that linear power supply 3 exports are defeated by the delay circuit that resistance 31 and capacitance 35 are formed
Enter the in-phase input end to comparator 36, by adjusting resistance 31,32,33 and the parameter value of capacitance 34,35 so that comparator
36 homophase input voltage is later than reverse inter-input-ing voltage and reaches setting value, when homophase input voltage is higher than reverse inter-input-ing voltage,
Comparator 36 exports high level, and high level control metal-oxide-semiconductor driving circuit 5 is connected metal-oxide-semiconductor 6, is powered on to load 7.
In short, the utility model solves the problems, such as following 2：1st, it eliminates button and presses the shake generated in the process and cause
The saltus step of load power source；2nd, static discharge has been blocked, to the path of metal-oxide-semiconductor, metal-oxide-semiconductor to be protected not to be damaged by static electricity by button.
Claims (3)
- The twitter circuit 1. a kind of power switch disappears, it is characterised in that：It is more electric including power supply, switching circuit, linear power supply, delay Road, metal-oxide-semiconductor driving circuit and metal-oxide-semiconductor；Power supply by switching circuit to linear power supply power, linear power supply to delay comparison circuit With metal-oxide-semiconductor drive circuitry, delay comparison circuit exports a control signal to metal-oxide-semiconductor driving circuit, to open metal-oxide-semiconductor, It powers to the load；Switching circuit is produced during mechanical switch is avoided to act by the way of capacitance is connected with transistor collector Influence of the raw shake to linear power supply output voltage；Comparison circuit be delayed by the way that comparator homophase input voltage is controlled to be later than instead Phase input voltage reaches setting value, exports the break-make of stable control signal control power supply master switch metal-oxide-semiconductor.
- The twitter circuit 2. power switch according to claim 1 disappears, it is characterised in that：The switching circuit include triode, Resistance, capacitance and button switch, triode are PNP triodes, and the emitter of triode is connected to power supply, and collector is connected to electricity Hold and linear power supply, base stage are connected to one end of resistance, the other end of resistance is connected to one end of button switch, and capacitance one end connects Linear power supply is connected to, the other end is connected to ground terminal, and the other end of button switch is connected to ground terminal.
- The twitter circuit 3. power switch according to claim 1 disappears, it is characterised in that：The delay comparison circuit includes first Resistance, second resistance, 3rd resistor, the first capacitance, the second capacitance and comparator, one end of first resistor are connected to linear power supply Output, the other end is connected to the in-phase input end of comparator together with the second capacitance, and the other end of the second capacitance is connected to line Property power supply ground terminal, one end of second resistance is connected to the output terminal of linear power supply, the other end and 3rd resistor and the first capacitance It is connected to the inverting input of comparator together, the other end of 3rd resistor is connected to ground together with the other end of the first capacitance End.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721302753.3U CN207504837U (en) | 2017-09-30 | 2017-09-30 | A kind of power switch disappears twitter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721302753.3U CN207504837U (en) | 2017-09-30 | 2017-09-30 | A kind of power switch disappears twitter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207504837U true CN207504837U (en) | 2018-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721302753.3U Active CN207504837U (en) | 2017-09-30 | 2017-09-30 | A kind of power switch disappears twitter circuit |
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| Country | Link |
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| CN (1) | CN207504837U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114268075A (en) * | 2022-03-03 | 2022-04-01 | 万灵帮桥医疗器械(广州)有限责任公司 | Anti-ignition circuit and power supply |
-
2017
- 2017-09-30 CN CN201721302753.3U patent/CN207504837U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114268075A (en) * | 2022-03-03 | 2022-04-01 | 万灵帮桥医疗器械(广州)有限责任公司 | Anti-ignition circuit and power supply |
| CN114268075B (en) * | 2022-03-03 | 2022-06-21 | 万灵帮桥医疗器械(广州)有限责任公司 | Anti-ignition circuit and power supply |
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