CN109901689A - Hardware switch circuit - Google Patents
Hardware switch circuit Download PDFInfo
- Publication number
- CN109901689A CN109901689A CN201910088624.6A CN201910088624A CN109901689A CN 109901689 A CN109901689 A CN 109901689A CN 201910088624 A CN201910088624 A CN 201910088624A CN 109901689 A CN109901689 A CN 109901689A
- Authority
- CN
- China
- Prior art keywords
- switching tube
- switch
- circuit
- resistance
- connect
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Abstract
A kind of hardware switch circuit, including switching tube, bleeder circuit, key switch and charge/discharge unit；For connecting to power supply, the second end of switching tube is used to connect with electrical work circuit connection, the third end of switching tube and the output end of bleeder circuit the first end of switching tube；For connecting to power supply, the control terminal of bleeder circuit and the second end of switching tube connect the input terminal of bleeder circuit；The first end of key switch and the third end of switching tube connect, and the second end of key switch and the charge-discharge end of charge/discharge unit connect；The ground terminal of charge/discharge unit is grounded.The hardware switch circuit provided in the embodiment of the present invention is different from traditional software switch circuit, does not need to connect with electric appliance MCU, does not also need additional MCU control, is not take up the I/O interface resource of MCU, circuit structure is simple, at low cost.
Description
Technical field
The present invention relates to electronic circuit field more particularly to a kind of hardware switch circuits.
Background technique
Electronic product requires the switching on and shutting down using switch control electronic product in life.Existing switch majority is with soft
For part come what is controlled, booting, the process needs of shutdown are first by MCU (Microcontroller Unit, micro-control unit)
Run switch machine program, which carries out control to power supply, could complete booting or shutdown movement.This on-off mode needs to occupy MCU
I/O port resource, cause circuit structure complicated, hardware cost is high.
Summary of the invention
Based on this, it is necessary to which the technical issues of needing to occupy the I/O interface resource of MCU for above-mentioned software control switch mentions
A kind of hardware switch circuit out.
The embodiment of the present invention provides a kind of hardware switch circuit, including switching tube, bleeder circuit, key switch and charge and discharge
Electric unit；
The first end of switching tube for connecting to power supply, the second end of switching tube be used for electrical work circuit connection, open
The output end at the third end and bleeder circuit of closing pipe connects；
For connecting to power supply, the control terminal of bleeder circuit and the second end of switching tube connect the input terminal of bleeder circuit；
The first end of key switch and the third end of switching tube connect, the second end of key switch and filling for charge/discharge unit
Discharge end connection；
The ground terminal of charge/discharge unit is grounded.
Bleeder circuit includes switch unit, first resistor and second resistance in one of the embodiments,；
For the first end of first resistor for connecting power supply, the second end of first resistor is separately connected the first of second resistance
End, the third end of switching tube and the first end of key switch；
The second end of the first end connection second resistance of switch unit, the second end ground connection of switch unit, switch unit
The second end of third end connection switch pipe；Switch unit is used under the output control of switching tube be connected.
Switching tube is P-channel enhancement type FET in one of the embodiments, P-channel enhancement type FET
Source electrode is used for connecting circuit operating circuit for connecting power supply, drain electrode, and grid is separately connected the second end of first resistor and opens
The first end of pass.
Switch unit includes NPN type triode, the collector of NPN type triode and second in one of the embodiments,
The second end of resistance connects, the drain electrode connection of base stage and P-channel enhancement type FET, emitter ground connection.
Charge/discharge unit includes capacitor in one of the embodiments, the first end of capacitor respectively with key switch
Second end and field-effect tube output end connection, capacitor second end ground connection.
Hardware switch circuit further includes 3rd resistor and the 4th resistance in one of the embodiments,；The base of NPN triode
Pole is connected by the drain electrode of 3rd resistor and P-channel enhancement type FET, and passes through the 4th resistance eutral grounding.
Hardware switch circuit further includes the 5th resistance in one of the embodiments, and the first end of capacitor passes through the 5th
Resistance and the output end of field-effect tube connect.
Bleeder circuit includes adjustable potentiometer and switch unit in one of the embodiments,；
For first fixing end of adjustable potentiometer for connecting power supply, the input terminal of the second fixing end connection switch unit can
The adjusting output end of potentiometer is adjusted to connect respectively with the first end at the third end of switching tube and key switch.
Switch unit includes relay in one of the embodiments, and the of the first contact of relay and second resistance
The connection of two ends, the second contact ground of relay, the first end of relay coil and the output end of switching tube connect, relay line
The second end of circle is grounded.
The embodiment of the present invention also provides a kind of electrical appliance, the hardware switch circuit provided including any of the above-described embodiment.
Above-mentioned hardware switch circuit when booting, makes charge/discharge unit charge by the triggering of key switch, thus
Drag down the third end voltage instantaneous of switching tube, the conducting of trigger switch pipe powers to electrical work circuit.Circuit
When work, the second end of switching tube also completely charges to charge/discharge unit as output end, and makes bleeder circuit to power supply
It divides and exports to the third end of switching tube, to maintain the on state of switching tube, realize booting.When shutdown, key switch
Charge/discharge unit is triggered to discharge to the third end of switching tube, so that the voltage at switching tube third end improves in a short time,
On-off switching tube.Its second end just stops exporting as output end after switching tube shutdown, so that bleeder circuit stops to power supply point
It presses to the control terminal output supply voltage of switching tube, maintains switching tube off state, realize shutdown.The embodiment of the present invention it is hard
Part switching circuit, which does not need to connect with the MCU of electrical appliance, can be realized switching on and shutting down, be different from traditional software switch circuit, can
The I/O interface resource of MCU is saved, circuit structure is simple, and it is at low cost and versatile, it is adapted to different electrical equipments and opens
It closes, it is not necessary to reappraise design alternative because occupying the I/O interface resource of MCU.
Detailed description of the invention
Fig. 1 is the functional block diagram of one embodiment of the invention hardware switch circuit；
Fig. 2 is the circuit structure diagram of one embodiment of the invention hardware switch circuit.
Specific embodiment
Purpose, technical solution and technical effect for a better understanding of the present invention, below in conjunction with drawings and examples
Further explaining illustration is carried out to the present invention.It states simultaneously, embodiments described below for explaining only the invention, and does not have to
It is of the invention in limiting.
As shown in Figure 1, the embodiment of the present invention provides a kind of hardware switch circuit, including switching tube 1, bleeder circuit 2, key
Switch 3 and charge/discharge unit 4.
For connecting with power supply 5, the second end of switching tube 1 is used to connect with electrical work circuit 6 first end of switching tube 1
It connects, the third end of switching tube 1 is connect with the first end of the output end of bleeder circuit 2 and key switch 3 respectively.Generally, it opens
The first end of pipe 1 is closed as input terminal, the second end of switching tube 1 is as output end, and the third end of switching tube 1 is as control terminal.
The input terminal of bleeder circuit 2 is used to connect with power supply 5, the control terminal of bleeder circuit 2 and the second end of switching tube 1
Connection.Bleeder circuit 2 exports different branch pressure voltages to switching tube 1 for dividing to 5 voltage of power supply.
The first end of key switch 3 is connect with the third end of the output end of bleeder circuit 2 and switching tube 1 respectively, key
The second end of switch 3 is connect with charge/discharge unit 4.The ground terminal of charge/discharge unit 4 is grounded.
Wherein, switching tube 1 can be field-effect tube, be also possible to triode, as long as third end voltage is less than first end electricity
Conducting and third end voltage are equal to or more than turn off when first end voltage when pressure, i.e. the conduction threshold electricity of first switch tube 1
Pressure is less than zero.Such as P-channel enhancement type metal oxide semiconductor field effect tube, such as PNP triode etc..Bleeder circuit 2
It can be the circuit containing variable potentiometer；It is also possible to series resistance bleeder circuit 2；In alternating current, can also be containing
The circuit of series capacitance；It can be with other integration modules with voltage divide function.2 need of bleeder circuit can be connected in switching tube 1
When carry out different partial pressures to by 5 voltage of power supply, and by branch pressure voltage to the three-polar output of switching tube 1.Charge and discharge list
Member 4 can be any circuit for being able to carry out charge and discharge and be also possible to capacitor for example, charge/discharge unit 4 can be capacitor
With charge-discharge circuit made of other combination of devices, charge and discharge integration module or rechargeable battery can also be, as long as can
It realizes and is charged and discharged.Key switch 3 is reducible key switch 3, by place circuit when pressing for connecting circuit
Branch conducting.
Upon power-up, switch 3 is pressed the button, charge/discharge unit 4 drags down 1 third end voltage of switching tube, and switching tube 1 is connected,
Bleeder circuit 2, which receives the pipe 1 that opens the light, output, and 2 control switch pipe 1 of bleeder circuit is held on.When shutdown, switch is pressed the button
3, charge/discharge unit 4 draws high 1 third end voltage of switching tube, the pipe 1 that opens the light shutdown, bleeder circuit 2 monitor switching tube 1 without output,
2 control switch pipe 1 of bleeder circuit is held off.
Now each state of hardware switch circuit is described in detail: when original state, hardware switch circuit does not work, partial pressure
Circuit 2 connects power supply 5, supports continuous output first voltage to the third of switching tube 1, keeps switching tube 1 in an off state.
It presses the button switch 3 at this time to boot up, the charge circuit of charge/discharge unit 4, bleeder circuit is connected in key switch 3
2 pairs of charge/discharge units 4 charge, and during charge/discharge unit 4 charges, the third end voltage of switching tube 1 is charged or discharged
Unit 4 drags down, and reaches the on state threshold voltage of switching tube 1, i.e. the third end voltage of switching tube 1 is less than first end voltage, switch
Pipe 1 is connected, to power to electrical work circuit 6.Since the control terminal of bleeder circuit 2 is connect with the second end of switching tube 1, this
When bleeder circuit 2 control terminal receive the output of switching tube 1, then power supply 5 is divided, and branch pressure voltage is exported to opening
Close pipe 1 third end so that the third end voltage of switching tube 1 be less than first end voltage, keep switching tube 1 be connected, continue to
Electrical work circuit 6 is powered, and booting is completed.
When hardware switch works, 1 constant conduction of switching tube, and charge/discharge unit 4 is filled by the second end completion of switching tube 1
Electricity, since switching tube 1 whether selects field-effect tube or triode, conduction voltage drop is generally all smaller, therefore charge and discharge
The voltage at 4 both ends of unit is approximately equal to the voltage of power supply 5.
Switch 3 is pressed the button at this time to shut down, the connection of charge/discharge unit 4 and bleeder circuit 2 is connected in key switch 3,
The externally electric discharge in a relatively short period of time of charge/discharge unit 4, so that the third end voltage of switching tube 1 is pulled to close to 5 electricity of power supply
Pressure, the voltage difference between the third end voltage and first end voltage of switching tube 1 cannot reach on state threshold voltage, switching tube at this time
1 shutdown.Since the control terminal of bleeder circuit 2 is connect with the second end of switching tube 1, switching tube 1 stops output, and bleeder circuit 2 is then
To the three-polar output second voltage of switching tube 1, it is held off switching tube 1, completes shutdown.
The hardware switch circuit provided in the embodiment of the present invention is different from traditional software switch circuit, does not need and electricity
Device MCU connection does not need additional MCU control yet, is not take up the I/O interface resource of MCU, circuit structure is simple, at low cost.
As shown in Fig. 2, bleeder circuit 2 includes switch unit, first resistor R1 and second in one of the embodiments,
Resistance R2；
Wherein, first resistor R1 and second resistance R2 is for dividing power supply 5, and branch pressure voltage is output to first
The control terminal of switching tube 1, so that switching tube 1 is connected under branch pressure voltage control.Wherein, the first end of first resistor R1 is for connecting
Connect power supply, the first end of the second end connection second resistance R2 of first resistor R1, the second end connection switch list of second resistance R2
The first end of member.The third end of switching tube 1 is also connected to the second end of first resistor R1.Since switching tube 1 is in third end voltage
Therefore conducting when less than first end voltage and meeting on state threshold voltage only needs the resistance value of first resistor R1 to be greater than second resistance
The resistance value of R2 makes the on state threshold voltage for meeting the pipe that opens the light when partial pressure.
Switch unit can be field-effect tube, be also possible to triode, meet as long as inputting to the third end of switch unit
Switch unit can be connected when predetermined threshold voltage.The first end of switch unit is connect with the first end of second resistance R2, is opened
The second end ground connection of unit is closed, the third end of switch unit is connect with the second end of switching tube 1.Generally, the of switch unit
One end is as input terminal, and the second end of switch unit is as output end, and the third end of switch unit is as control terminal.
Since the first end of first resistor R1 connects power supply 5, the third end of second end connection switch pipe 1, under original state,
Hardware switch circuit does not work, and switching tube 1 is off state, thus the second end of first resistor R1 is to the third end of switching tube 1
5 voltage of out-put supply, so that the third end voltage of switching tube 1 is equal with the first end voltage of switching tube 1, switching tube 1, which is in, to be closed
Disconnected state.Switch 3 is pressed the button at this time, the circuit of first resistor R1 and charge/discharge unit 4 is connected, and power supply 5 passes through first resistor
R1 charges to charge/discharge unit 4, and within the short period that charge/discharge unit 4 charges, the third end voltage of switching tube 1 is pulled low,
Switching tube 1 is connected, to power to electrical work circuit 6.Since the second end of switching tube 1 and the third end of switch unit connect
It connects, to switch unit output voltage, therefore switching means conductive at this time, electric current flow to second resistance R2 from first resistor R1, by
It is greater than the resistance value of second resistance R2 in the resistance value of first resistor R1, the branch at the common place first resistor R1 and second resistance R2
In, the partial pressure of first resistor R1 and second resistance R2 are output to the third end of switching tube 1, and it is small to meet 1 third end voltage of switching tube
In the turn-on condition of first end voltage, thus 1 on state of switching tube is kept, continues to power to electrical work circuit 6, complete out
Machine.When hardware switch circuit works, charge/discharge unit 4 completes charging by the second end of switching tube 1, presses the button switch at this time
3, charge/discharge unit 4 is discharged by second resistance R2, and within a short period of time, the voltage at 1 third end of switching tube is pulled to close
The voltage of 1 first end of switching tube, switching tube 1 turn off, and stop powering to electrical work circuit 6.Due to the third end of switch unit
It is connect with the second end of switching tube 1, after switching tube 1 stops output, switch unit is also switched off, so that the third end electricity of switching tube 1
Pressure is equal with 5 voltage of power supply, and switching tube 1 is held off, and completes shutdown.
Hardware switch circuit provided in this embodiment, by first resistor R1 and second resistance R2 to the partial pressure of power supply 5, by
Key switch 3 triggers the turn-on and turn-off of the charge and discharge control switching tube 1 of charge/discharge unit 4, and switch unit is according to switching tube 1
On state and off state that situation keeps switching tube 1 is connected, realizes startup and shutdown.Startup and shutdown process do not need by
MCU etc. controls the control of chip, and structure is simple, is not take up MCU interface resource, and circuit exploitation does not need written in code yet, saves
Hardware cost and human cost.
Switching tube 1 includes P-channel metal-oxide-semiconductor field-effect tube (P channel in one of the embodiments,
Metal-Oxide-Semiconductor Field-Effect Transistor, P-MOSFET), and be enhanced.P-
The source electrode of MOSFET for connect with power supply 5, drain electrode for being connect with electrical work circuit 6, grid respectively with first resistor R1
Second end and key switch 3 first end connection.The turn-on condition of P-MOSFET is that grid voltage is less than source voltage.
Original state presses the button switch 3, and charge/discharge unit 4 drags down the grid voltage of P-MOSFET, and grid voltage is small
Reach conduction threshold in source voltage, P-MOSFET conducting drains and powers to electrical work circuit 6.The third end of bleeder circuit 2
It is connect with the drain electrode of P-MOSFET, provides conducting to the grid of P-MOSFET according to the output of P-MOSFET and keep voltage, keep
The on state of P-MOSFET.Switch 3 is pressed the button again, since charge/discharge unit 4 is by the drain charge of P-MOSFET, is filled
Discharge cell 4 discharges, and draws high the grid voltage of P-MOSFET so that P-MOSFET is turned off, the drain electrode of P-MOSFET without output, this
When bleeder circuit 2 according to the drain electrode of P-MOSFET export to the grid of P-MOSFET export shutdown keep voltage, keep P-
The off state of MOSFET completes shutdown.Optionally, P-MOSFET can choose the opening time and the turn-off time is both less than charge and discharge
The quick P-MOSFET of the charge and discharge time of electric unit 4, to guarantee the efficiency and accuracy of circuit switch.
Switch unit includes NPN type triode in one of the embodiments,.The collector of NPN type triode and second
The second end of resistance R2 connects, and base stage is connect with the second end of switching tube 1, emitter ground connection.Optionally, NPN type triode
Base stage is grounded by the drain electrode connection of 3rd resistor R3 and P-MOSFET and by the 4th resistance R4, emitter ground connection.
Original state presses the button switch 3, and switching tube 1 is connected, and the base stage of second end to the NPN triode of switching tube 1 is defeated
Enter voltage, so that NPN triode reaches on state threshold voltage, NPN triode is connected where first resistor R1 and second resistance R2
Branch, 5 voltage of power supply after the partial pressure of first resistor R1 and second resistance R2 to the third end of switching tube 1 provide partial pressure electricity
Pressure, so that the third end voltage of switching tube 1 is less than first end voltage, to keep the conducting of switching tube 1, i.e. holding circuit is opened
Machine state realizes booting.Quickly press the button switch 3 again at this time, the shutdown of 3 trigger switch pipe 1 of key switch, switching tube 1 stop to
NPN triode output voltage, NPN triode turn off, at this time branch circuit break, power supply 5 where first resistor R1 and second resistance R2
Voltage is provided to the first end of switching tube 1 by first resistor, so that switching tube 1 be made to be held off realization shutdown.
Charge/discharge unit 4 includes capacitor in one of the embodiments, one end of capacitor respectively with key switch 3 the
The connection of the second end of two ends and switching tube 1, the other end ground connection of capacitor.Capacitor can choose charging time longer capacitor,
So that the charge and discharge time is higher than the opening time and turn-off time of switching tube 1, guarantee switch efficiency and accuracy.
The base stage of NPN triode is connected by the drain electrode of 3rd resistor R3 and P-MOSFET in one of the embodiments,
And it is grounded by the 4th resistance R4.NPN triode is voltage driven type switching tube, is generally seldom directly connect with power supply 5, but
It is divided by the resistance of two series connection ground connection to the base stage of NPN triode and conducting control voltage is provided.In the present embodiment, lead to
The appropriate value of 3rd resistor R3 and the 4th resistance R4 are crossed, the conducting and shutdown of control NPN triode can be divided.
One end of capacitor is connected by the drain electrode of the 5th resistance R5 and P-MOSFET in one of the embodiments,.This
In embodiment, capacitor carries out charge and discharge as charge/discharge unit 4, and generally, capacitor needs to realize charge and discharge by resistance,
The high current of charge and discharge moment is reduced to protect circuit.One end of capacitor and the drain electrode of P-MOSFET connect, in P-
MOSFET is charged when being connected, so as to can draw high the grid voltage of P-MOSFET when pressing the button switch 3 and being shut down
Turn off P-MOSFET.
As shown in Fig. 2, bleeder circuit 2 includes first resistor R1 and second resistance R2 in one of the embodiments, and
NPN triode, first switch tube 1 are enhanced P-MOSFET, and charge/discharge unit 4 is capacitor.Wherein, the of first resistor R1
One end is for connecting power supply 5, the first end of the second end connection second resistance R2 of first resistor R1.The collector of NPN triode
The second end of second resistance R2 is connected, the base stage of NPN triode passes through the drain electrode of 3rd resistor R3 connection P-MOSFET and passes through
4th resistance R4 ground connection, the emitter ground connection of NPN triode.The source electrode of P-MOSFET drains for connecting power supply 5 for connecting
Electrical work circuit 6, grid are separately connected the first end of key switch 3 and the second end of first resistor R1.The one of capacitor
The second end of end connection key switch 3 is simultaneously connected by the drain electrode of the 5th resistance R5 and P-MOSFET.Optionally, P-MOSFET can
To choose grid source threshold voltage Vth1High speed switch tube less than or equal to -2.5V, capacitor selects the capacitor of 1 μ F, to guarantee capacitor
Charge and discharge time be switched on and off the time higher than P-MOSFET.NPN triode can choose on state threshold voltage Vth2It is greater than
Triode equal to 0.7V.Optionally, 5 voltage of power supply can select voltage VBATThe DC power supply 5 of=5V.In original state, still
Switch 3 is not pressed the button, and entire hardware switch circuit no current circuit, P-MOFET and NPN triode are in an off state, firmly
Part switching circuit is without output.The booting of switch 3 is pressed the button, power supply 5 is filled by first resistor R1 and key switch 3 to capacitor
The voltage of electricity, capacitor slowly rises from zero, it is clear that during capacitor charging, the gate source voltage V of P-MOSFETgsHave compared with
Short a period of time is less than grid source threshold voltage Vth1, therefore P-MOSFET is connected, and the drain electrode of P-MOSFET is to electrical work circuit
6 power supplies, while also voltage is provided to the base stage of NPN triode.At this point, the base voltage of NPN triode are as follows:
Wherein VbFor the base voltage of NPN triode, VdFor the drain electrode output voltage of P-MOSFET, R3For 3rd resistor R3
Resistance value, R4For the resistance value of the 4th resistance R4.Since the emitter of NPN triode is grounded, the base stage of NPN triode
Voltage is that it emits junction voltage Vbe.It is connected at this time to NPN triode, transmitting junction voltage V need to be metbeThreshold is connected greater than it
Threshold voltage Vth2.If NPN is connected, it may make first resistor R1 and second resistance R2 to divide 5 voltage of power supply, obtain P-
The grid voltage of MOSFET are as follows:
Wherein VgFor the grid voltage of P-MOSFET, R1For the resistance value of first resistor R1, R2For the resistance of second resistance R2
Value.To keep P-MOSFET conduction externally to export, booting is completed, then needs to meet gate source voltage VgsLess than grid source threshold value
Voltage Vth1.I.e.
Vgs=Vg-Vs< Vth1 (3)
According to expression formula (1) and expression formula (2), to first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance
For the value of R4 resistance value there are many combination, the present embodiment provides one of valued combinations, do not represent limitation of the invention.It can
Selection of land, can select first resistor R1 resistance value is 100K Ω, and second resistance R2 resistance value is 10K Ω, and 3rd resistor R3 resistance value is 10K
Ω, the 4th resistance R4 resistance value are 10K Ω, and the 5th resistance R5 resistance value is 100K Ω.It then can be obtained in above-mentioned state, by expression formula
(1) the NPN transistor base voltage V obtainedbGreater than on state threshold voltage Vth2, obtained by expression formula (2) and expression formula (3)
The gate source voltage V of P-MOSFETgs=-5V is less than grid source threshold voltage Vth1.For the 5th resistance R5, the 5th resistance can be configured
The resistance value of R5 is that 100K Ω charges to capacitor using the 5th resistance R5.
When shutdown, switch 3 is pressed the button again, because capacitor is via the leakage of P-MOSFET before pressing the button switch 3
Pole is charged by the 5th resistance R5, the voltage V at capacitor both endsCIt is approximately equal to input voltage VBAT, therefore after key switch 3 is pressed,
Capacitor is discharged over the ground by key switch 3, second resistance R2 and NPN triode, within the short period of discharge process, P-
The grid voltage of MOSFET obtains the about voltage of 5V because of capacitor electric discharge, so that the gate source voltage V of P-MOSFETgsGreater than grid source
Threshold voltage Vth1, therefore P-MOSFET is turned off, drain Non voltage output.Correspondingly, the base stage no-voltage input of NPN triode,
NPN triode shutdown.At this point, the grid voltage of P-MOSFET is pulled upward to 5 voltage V of power supply by first resistor R1BAT, i.e., at this time
Gate source voltage Vgs=0, P-MOSFET are held off, and drain Non voltage output, complete shutdown.
Bleeder circuit 2 includes adjustable potentiometer and switch unit in one of the embodiments,.Bleeder circuit 2 for pair
5 voltage of power supply is divided, and is kept voltage to provide to the control terminal of field-effect tube, is kept on state and the pass of field-effect tube
Disconnected state.
Switch unit includes relay in one of the embodiments, and the first contact of relay is with second resistance R2's
Second end connection, the first end of the second contact ground of relay, relay coil are connect with the second end of first switch tube 1,
The second end of relay coil is grounded.
Relay is a kind of electric control device, when the variation of input quantity reaches prescribed requirement, in electrical output circuit
Make controlled volume that a kind of electric appliance of scheduled Spline smoothing occur.It has the interactive relationship between input circuit and output loop,
It is a kind of switch that control high current running is gone with low current.In the present embodiment, switch unit can use relay.When
So, the present embodiment is only to provide one of connection of relay, and the second end ground connection of relay coil, which can be, to be directly grounded,
It can also pass through transistor ground connection etc. by the 6th resistance eutral grounding.
The embodiment of the present invention also provides a kind of electrical equipment, the hardware switch electricity provided including any of the above-described embodiment
Road.Wherein, electrical equipment can be any electrical equipment such as computer, television set.Electrical equipment in one of the embodiments,
It can be LED lamp, utilize the light on and off of hardware switch circuit control LED lamp.In this way, using hardware switch of the embodiment of the present invention
The LED lamp of circuit can save MCU interface resource compared to traditional software switching circuit, and switching circuit structure is simple, no
Design alternative must be reappraised to switching circuit.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of hardware switch circuit, which is characterized in that including switching tube, bleeder circuit, key switch and charge/discharge unit；
For connecting to power supply, the second end of the switching tube is used to connect with electrical work circuit the first end of the switching tube
It connects, the third end of the switching tube is connect with the output end of the bleeder circuit；
The input terminal of the bleeder circuit with the power supply for connecting, the control terminal of the bleeder circuit and the switching tube
Second end connection；
The first end of the key switch is connect with the third end of the switching tube, and the second end of the key switch is filled with described
The charge-discharge end of discharge cell connects；
The ground terminal of the charge/discharge unit is grounded.
2. hardware switch circuit according to claim 1, which is characterized in that the bleeder circuit includes switch unit,
One resistance and second resistance；
For the first end of the first resistor for connecting the power supply, the second end of the first resistor is separately connected described second
The third end of the first end of resistance and the switching tube；
The first end of the switch unit connects the second end of the second resistance, the second end ground connection of the switch unit, institute
The third end for stating switch unit connects the second end of the switching tube；The switch unit is used for the output control in the switching tube
The lower conducting of system.
3. hardware switch circuit according to claim 2, which is characterized in that the switching tube is P-channel enhancement type field effect
Ying Guan, the source electrode of P-channel enhancement type FET are used for connecting circuit operating circuit, grid for connecting the power supply, drain electrode
It is separately connected the second end of the first resistor and the first end of the switch.
4. hardware switch circuit according to claim 3, which is characterized in that the switch unit includes NPN type triode,
The collector of the NPN type triode is connect with the second end of the second resistance, base stage and the P-channel enhancement type field-effect
The drain electrode of pipe connects, emitter ground connection.
5. according to the described in any item hardware switch circuits of claim 4, which is characterized in that the charge/discharge unit includes capacitor
Device, the first end of the capacitor are connect with the output end of the second end of the key switch and the field-effect tube respectively,
The second end of the capacitor is grounded.
6. hardware switch circuit according to claim 4, which is characterized in that further include 3rd resistor and the 4th resistance；Institute
The base stage for stating NPN triode is connect by 3rd resistor with the drain electrode of the P-channel enhancement type FET, and passes through the 4th electricity
Resistance ground connection.
7. hardware switch circuit according to claim 5, which is characterized in that it further include the 5th resistance, the capacitor
First end is connect by the 5th resistance with the output end of the field-effect tube.
8. hardware switch circuit according to claim 1, which is characterized in that the bleeder circuit include adjustable potentiometer and
Switch unit；
For first fixing end of the adjustable potentiometer for connecting the power supply, the second fixing end connects the defeated of the switch unit
Enter end, the adjusting output end of the adjustable potentiometer respectively with the third end of the switching tube and the key switch first
End connection.
9. hardware switch circuit according to claim 2, which is characterized in that the switch unit includes relay, described
First contact of relay is connect with the second end of the second resistance, the second contact ground of the relay, the relay
The first end of device coil is connect with the output end of the switching tube, the second end ground connection of the relay coil.
10. a kind of electrical equipment, which is characterized in that including the described in any item hardware switch circuits of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910088624.6A CN109901689B (en) | 2019-01-29 | 2019-01-29 | Hardware switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910088624.6A CN109901689B (en) | 2019-01-29 | 2019-01-29 | Hardware switch circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109901689A true CN109901689A (en) | 2019-06-18 |
| CN109901689B CN109901689B (en) | 2021-10-12 |
Family
ID=66944439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910088624.6A Active CN109901689B (en) | 2019-01-29 | 2019-01-29 | Hardware switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109901689B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654276A (en) * | 2020-06-18 | 2020-09-11 | 湖南中科电气股份有限公司 | Switching value signal control circuit and control method |
| CN111654276B (en) * | 2020-06-18 | 2024-05-14 | 湖南中科电气股份有限公司 | Switching value signal control circuit and control method |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080094120A1 (en) * | 2005-12-13 | 2008-04-24 | Stmicroelectronics, S.R.I | Driving circuit for an emitter-switching configuration |
| CN101425797A (en) * | 2007-11-01 | 2009-05-06 | 深圳迈瑞生物医疗电子股份有限公司 | Slow opening fast shutting electronic switch circuit and control method thereof |
| CN201867606U (en) * | 2010-11-04 | 2011-06-15 | 北京握奇数据系统有限公司 | Switch circuit |
| CN204031110U (en) * | 2014-07-11 | 2014-12-17 | 深圳市航嘉驰源电气股份有限公司 | Electronic DC switch and electronic equipment |
| US20150042177A1 (en) * | 2013-08-09 | 2015-02-12 | Infineon Technologies Austria Ag | Semiconductor Device, Electronic Circuit and Method for Switching High Voltages |
| CN204810251U (en) * | 2015-05-28 | 2015-11-25 | 比亚迪股份有限公司 | Switching on and shutting down circuit of consumer and consumer |
| CN204836123U (en) * | 2015-06-29 | 2015-12-02 | 惠州市凯越电子有限公司 | Key switch detection circuitry |
| CN205750715U (en) * | 2016-05-11 | 2016-11-30 | 重庆工业职业技术学院 | A kind of computer power supply controller |
| RU168275U1 (en) * | 2016-04-04 | 2017-01-25 | Общество с ограниченной ответственностью "Завод технологических источников" | POWER KEY SHUTTER DRIVER |
| 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 |
| CN206922726U (en) * | 2017-05-11 | 2018-01-23 | 广州视琨电子科技有限公司 | A kind of self-locking electronic switching circuit |
| CN207010642U (en) * | 2017-06-14 | 2018-02-13 | 无锡市中健科仪有限公司 | Key switch circuit |
-
2019
- 2019-01-29 CN CN201910088624.6A patent/CN109901689B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080094120A1 (en) * | 2005-12-13 | 2008-04-24 | Stmicroelectronics, S.R.I | Driving circuit for an emitter-switching configuration |
| CN101425797A (en) * | 2007-11-01 | 2009-05-06 | 深圳迈瑞生物医疗电子股份有限公司 | Slow opening fast shutting electronic switch circuit and control method thereof |
| CN201867606U (en) * | 2010-11-04 | 2011-06-15 | 北京握奇数据系统有限公司 | Switch circuit |
| US20150042177A1 (en) * | 2013-08-09 | 2015-02-12 | Infineon Technologies Austria Ag | Semiconductor Device, Electronic Circuit and Method for Switching High Voltages |
| CN204031110U (en) * | 2014-07-11 | 2014-12-17 | 深圳市航嘉驰源电气股份有限公司 | Electronic DC switch and electronic equipment |
| CN204810251U (en) * | 2015-05-28 | 2015-11-25 | 比亚迪股份有限公司 | Switching on and shutting down circuit of consumer and consumer |
| CN204836123U (en) * | 2015-06-29 | 2015-12-02 | 惠州市凯越电子有限公司 | Key switch detection circuitry |
| RU168275U1 (en) * | 2016-04-04 | 2017-01-25 | Общество с ограниченной ответственностью "Завод технологических источников" | POWER KEY SHUTTER DRIVER |
| CN205750715U (en) * | 2016-05-11 | 2016-11-30 | 重庆工业职业技术学院 | A kind of computer power supply controller |
| CN206922726U (en) * | 2017-05-11 | 2018-01-23 | 广州视琨电子科技有限公司 | A kind of self-locking electronic switching circuit |
| CN207010642U (en) * | 2017-06-14 | 2018-02-13 | 无锡市中健科仪有限公司 | Key switch 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 |
Non-Patent Citations (3)
| Title |
|---|
| W. F. LEE: ""An injection-nulling switch for switched-capacitor circuit applications"", 《IN IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT》 * |
| 吴丹: ""基于MOS管测井仪器开关电路设计"", 《石油管材与仪器》 * |
| 杜倚诚: ""一种新型的按键控制开关电路"", 《家电科技》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654276A (en) * | 2020-06-18 | 2020-09-11 | 湖南中科电气股份有限公司 | Switching value signal control circuit and control method |
| CN111654276B (en) * | 2020-06-18 | 2024-05-14 | 湖南中科电气股份有限公司 | Switching value signal control circuit and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109901689B (en) | 2021-10-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108123596B (en) | NMOS switching tube driving circuit | |
| CN108539964A (en) | The driving circuit and its device of power switch tube | |
| CN103825436B (en) | A kind of power field effect tube drive circuit of high speed big current | |
| CN110880737A (en) | Charging chip, overvoltage protection circuit thereof and portable electronic equipment | |
| CN106849925B (en) | High-side NMOS drive circuit | |
| CN105720960B (en) | On/off circuit | |
| CN207010642U (en) | Key switch circuit | |
| CN104079158A (en) | Ultra-low static power consumption power source starting control circuit | |
| CN105897240A (en) | Single-button soft on-off circuit with hardware forced power-off function | |
| CN109617544A (en) | A kind of novel electrifying timing sequence control equipment, system and method | |
| CN208971382U (en) | Soft start DC power supply switch circuit and the electronic equipment for applying it | |
| CN109901689A (en) | Hardware switch circuit | |
| CN109474264B (en) | Zero-power-consumption electronic switch driving circuit for realizing low-voltage and high-voltage switching-off and control method | |
| CN110098661A (en) | Power supply switch circuit and household electrical appliance | |
| CN208508901U (en) | Reset automatic boot circuit and electronic equipment | |
| CN105656468A (en) | Switch control device and method for electronic device, and electronic device | |
| CN210927592U (en) | Startup and shutdown circuit | |
| CN206195643U (en) | Take relay drive's constant voltage power supply integrated circuit | |
| CN112133238B (en) | Drive circuit and electronic device | |
| CN208739028U (en) | A kind of circuit of control negative pressure output | |
| CN209104803U (en) | A kind of protection circuit | |
| CN103841711B (en) | A kind of LED emergence lighting lamp and drive circuit thereof | |
| CN207968454U (en) | A kind of switching circuit and underwater equipment | |
| CN203206380U (en) | Starting control circuit, display panel driving circuit and display apparatus | |
| CN108183608B (en) | Boosting circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 519000 No. 333, Kexing Road, Xiangzhou District, Zhuhai City, Guangdong Province Applicant after: ZHUHAI JIELI TECHNOLOGY Co.,Ltd. Address before: Floor 1-107, building 904, ShiJiHua Road, Zhuhai City, Guangdong Province Applicant before: ZHUHAI JIELI TECHNOLOGY Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |