CN105406845B - A kind of PMOS switches off control circuit and for electric installation - Google Patents
A kind of PMOS switches off control circuit and for electric installation Download PDFInfo
- Publication number
- CN105406845B CN105406845B CN201510864005.3A CN201510864005A CN105406845B CN 105406845 B CN105406845 B CN 105406845B CN 201510864005 A CN201510864005 A CN 201510864005A CN 105406845 B CN105406845 B CN 105406845B
- Authority
- CN
- China
- Prior art keywords
- circuit
- pmos
- control
- control circuit
- output
- 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.)
- Active
Links
- 238000009434 installation Methods 0.000 title claims abstract description 30
- 230000005611 electricity Effects 0.000 claims description 18
- 238000010586 diagram Methods 0.000 description 7
- 230000003071 parasitic effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 210000005069 ears Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/04—Modifications for accelerating switching
- H03K17/042—Modifications for accelerating switching by feedback from the output circuit to the control circuit
- H03K17/04206—Modifications for accelerating switching by feedback from the output circuit to the control circuit in field-effect transistor switches
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic 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
- H03K17/687—Electronic 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
Landscapes
- Electronic Switches (AREA)
Abstract
Switch off control circuit the invention discloses a kind of PMOS and for electric installation, PMOS switches off control circuit including control unit and switch unit；Discharge current when described control unit is turned off according to pmos circuit controls switching means conductive, make the circuit electric discharge that discharge current passes through control unit and switch unit is formed, the circuit can accelerate the velocity of discharge of discharge current, PMOS tube can be rapidly switched off need not aggravate fictitious load again, its is simple in structure, cost is relatively low, and performance is stablized；It solves the problems, such as existing to aggravate fictitious load and then overall efficiency to be caused to reduce Wei PMOS tube is rapidly switched off.
Description
Technical field
The present invention relates to power technique fields, more particularly to a kind of PMOS switches off control circuit and for electric installation.
Background technology
With the popularization and application of electronic product, semiconductor device art is developed rapidly.Wherein, PMOS tube is as electricity
Sub switch device is applied in electronic product more and more.Due between the grid G and source level S of PMOS tube there are itself
Parasitic capacitance CGS and the anti-tampering capacitance being additionally added, thus pay particular attention in use due to the capacitance between G-S and
The problem of causing PMOS tube turn-off speed to slow down.
Usually, after feeder ear dead electricity, each group output of output end needs to carry out power down in particular order equipment.
Power supply is in AC（City's alternating current）After power down, each group output can also keep normal level about 10mS ~ 20mS.If the load of certain road is compared
It is small, then its retention time can be longer.Retention time is too long may to bring some counter productives.For example, power supply output+12V
To audio（Audio parts）Power supply, after AC is powered off, if mainboard is connected to instruction and is stopped, and+12V can also keep one section
The long time, then audio generates the quick-fried of ' puff ' in the case of power supply+12V normal power supplies because not controlled by mainboard
At the top of one's voice.
The explosion sound of ' puff ' is generated in order to prevent, and designer, which can be first turned off, gives audio power supply+12V, then turns off again
Mainboard.It is directly to aggravate fictitious load in power output end to turn off to the common methods of the audio+12V to power, and+12V is made quickly to fall
Electricity；Or power output end makees electronic switch with audio feeder ears with PMOS, then aggravates fictitious load in audio feeder ears again,
Its supply voltage is set to decline rapidly.
Both methods its be all to accelerate power down by increasing fictitious load at all.It must in order to rapidly switch off PMOS tube
Fictitious load must be increased to be equal to increase power attenuation, this partition losses is discharged with thermal energy completely, therefore reduces complete machine
Efficiency.
Therefore, it is necessary to be improved to the prior art.
Invention content
In view of above-mentioned deficiencies of the prior art place, switch off control circuit the purpose of the present invention is to provide a kind of PMOS and
For electric installation, fictitious load must be aggravated to solve existing as PMOS tube is rapidly switched off and then cause what overall efficiency reduced to ask
Topic.
In order to achieve the above object, this invention takes following technical schemes：
A kind of PMOS switches off control circuit comprising：Control unit and switch unit；
Discharge current when described control unit is turned off according to pmos circuit controls switching means conductive, makes discharge current
The circuit electric discharge formed by control unit and switch unit.
During the PMOS switches off control circuit, described control unit includes first resistor and the first diode；
One end of the first resistor is the input terminal that PMOS switches off control circuit；The other end of first resistor and the one or two
The anode connection of pole pipe, the other end of first resistor are the control terminal that PMOS switches off control circuit；The cathode of first diode connects
Connect switch unit.
During the PMOS switches off control circuit, the switch unit includes the first triode;
The base stage of first triode connects the cathode of the first diode；The extremely PMOS shutdowns of the current collection of first triode
First output end of control circuit；The second output terminal that the transmitting extremely PMOS of first triode switches off control circuit.
During the PMOS switches off control circuit, the switch unit further includes third transistor；
The base stage of the third transistor connects the collector of the first triode, and the transmitting extremely PMOS of third transistor is closed
First output end of disconnected control circuit；The collector of third transistor connects the emitter of the first triode, third transistor
The second output terminal that current collection extremely PMOS switches off control circuit.
During the PMOS switches off control circuit, described control unit includes the 4th resistance, the 4th triode and the 4th electricity
Hold；The switch unit includes the first optocoupler；
One end of 4th resistance is the input terminal that PMOS switches off control circuit, the other end connection first of the 4th resistance
1st foot of optocoupler, the 2nd foot of the first optocoupler connect the collector of the 4th triode；The base stage of 4th triode turns off for PMOS
The control terminal of control circuit connects one end of the 4th capacitance；The emitter of 4th triode connect the 4th capacitance the other end and
Ground；3rd foot of the first optocoupler is the second output terminal that PMOS switches off control circuit；4th foot of the first optocoupler is PMOS shutdown controls
First output end of circuit processed.
During the PMOS switches off control circuit, described control unit includes the 5th resistance, the 6th resistance, the 5th triode
With the 5th capacitance；The switch unit includes the second optocoupler；
One end of 6th resistance is the input terminal that PMOS switches off control circuit, and connects one end of the 5th resistance；6th
The other end of resistance connects the base stage of the 5th triode；The base stage of 5th triode is the control terminal that PMOS switches off control circuit,
Connect one end of the 5th capacitance；The other end of 5th capacitance is grounded, the emitter ground connection of the 5th triode, the collection of the 5th triode
2nd foot of electrode the second optocoupler of connection, the other end of the 1st foot the 5th resistance of connection of second optocoupler, the 4th of the second optocoupler the
Foot is the first output end that PMOS switches off control circuit；It is second defeated that 3rd foot of the second optocoupler is that PMOS switches off control circuit
Outlet.
It is a kind of for electric installation, including input circuit, pmos circuit, control circuit and output circuit, which is characterized in that also
Switch off control circuit including the PMOS；
The input circuit is to being transferred to pmos circuit after the voltage filter of input, control circuit is according to control signal control
The break-make of pmos circuit processed；Output voltage exports after output circuit filters when pmos circuit is connected；PMOS shutdown controls
Circuit reduces the current drain of pmos circuit when pmos circuit is connected；Also PMOS tube is controlled when pmos circuit disconnects
Circuit discharging.
It is described in electric installation, the input circuit includes the first capacitance；The pmos circuit includes PMOS tube,
Two resistance, 3rd resistor and the second capacitance；Control circuit includes the second triode, and output circuit includes third capacitance；
The input terminal that one end connection PMOS of first capacitance switches off control circuit, the other end ground connection of the first capacitance；
The source electrode of the PMOS tube connects the first output that one end of the second capacitance, one end of second resistance and PMOS switch off control circuit
End, the grid connection other end of the second capacitance, the other end of second resistance, one end of 3rd resistor and the PMOS shutdowns of PMOS tube
The second output terminal of control circuit；One end of the drain electrode connection third capacitance C3 of PMOS tube, the other end of the 3rd resistor connect
Connect the collector of control terminal and the second triode Q2 that PMOS switches off control circuit, the base stage input control of the second triode Q2
Signal processed, the emitter ground connection of the second triode Q2.
It is a kind of for electric installation, including input circuit, pmos circuit, control circuit and output circuit, which is characterized in that also
Switch off control circuit including the PMOS；The input terminal that the input circuit connection PMOS switches off control circuit, PMOS shutdowns
The input terminal and pmos circuit that the first output end connection PMOS of control circuit switches off control circuit, PMOS switch off control circuit
Second output terminal connect pmos circuit, control terminal that PMOS switches off control circuit connection pmos circuit and control circuit,
Pmos circuit connects control circuit；
The input circuit is to being transferred to pmos circuit after the voltage filter of input, control circuit is according to control signal control
The break-make of pmos circuit processed；Output voltage exports after output circuit filters when pmos circuit is connected；PMOS shutdown controls
Circuit reduces the current drain of pmos circuit when pmos circuit is connected；Also PMOS tube is controlled when pmos circuit disconnects
Circuit and input circuit electric discharge.
It is a kind of for electric installation, including input circuit, pmos circuit, control circuit and output circuit, which is characterized in that also
Switch off control circuit including the PMOS；The first output end and PMOS that the input circuit connection PMOS switches off control circuit
Pipe circuit, input terminal that PMOS switches off control circuit connection pmos circuit and output circuit, PMOS switch off control circuit the
Two output ends connect pmos circuit, the control terminal connection pmos circuit and control circuit that PMOS switches off control circuit；
The input circuit is to being transferred to pmos circuit after the voltage filter of input, control circuit is according to control signal control
The break-make of pmos circuit processed；Output voltage exports after output circuit filters when pmos circuit is connected；PMOS shutdown controls
Circuit reduces the current drain of pmos circuit when pmos circuit is connected；Also PMOS tube is controlled when pmos circuit disconnects
Circuit, input circuit and output circuit electric discharge.
Compared to the prior art, PMOS provided by the invention switches off control circuit and for electric installation, PMOS shutdown control electricity
Road includes control unit and switch unit；Discharge current control switch when described control unit is turned off according to pmos circuit is single
Member conducting makes the circuit electric discharge that discharge current passes through control unit and switch unit is formed, which can accelerate discharge current
The velocity of discharge, can rapidly switch off PMOS tube need not aggravate fictitious load again, and simple in structure, cost is relatively low, and performance is stablized；It solves
Existing the problem of must aggravating Wei PMOS tube is rapidly switched off fictitious load and then overall efficiency is caused to reduce.
Description of the drawings
Fig. 1 is the structure diagram provided in an embodiment of the present invention for electric installation first embodiment；
Fig. 2 is the circuit diagram provided in an embodiment of the present invention for electric installation first embodiment；
Fig. 3 be it is provided in an embodiment of the present invention in electric installation control signal be high level when, current signal flow graph；
Fig. 4 be it is provided in an embodiment of the present invention in electric installation control signal be low level when, current signal flow graph；
Fig. 5 is the circuit diagram provided in an embodiment of the present invention for one preferred embodiment of electric installation；
Fig. 6 is the structure diagram provided in an embodiment of the present invention for electric installation second embodiment；
Fig. 7 is the circuit diagram provided in an embodiment of the present invention for electric installation second embodiment；
Fig. 8 is the structure diagram provided in an embodiment of the present invention for electric installation 3rd embodiment；
Fig. 9 is the circuit diagram provided in an embodiment of the present invention for electric installation 3rd embodiment.
Specific implementation mode
A kind of PMOS of present invention offer switches off control circuit and for electric installation, is adapted to monitor for device, display main board, computer
Mainboard, Switching Power Supply etc. carry out the power circuit of switch control by PMOS tube.To make the purpose of the present invention, technical solution and effect
Fruit is clearer, clear, and the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.It should be appreciated that this place
Specific examples are only used to explain the present invention for description, is not intended to limit the present invention.
Please refer to Fig. 1 and Fig. 2, it is provided in an embodiment of the present invention for electric installation include PMOS switch off control circuit 100,
Input circuit 200, pmos circuit 300, control circuit 400 and output circuit 500.Electricity of the input circuit 200 to input
It is transferred to pmos circuit 300 after pressure+12VA filtering, control circuit 400 controls PMOS tube according to externally input control signal
The break-make of circuit 300；Output voltage exports after the filtering of output circuit 500 when pmos circuit 300 is connected.PMOS shutdown controls
Circuit 100 reduces the current drain of pmos circuit 300 when pmos circuit 300 is connected；Also disconnected in pmos circuit 300
When control pmos circuit 300 discharge, so that pmos circuit 300 is rapidly switched off.
The PMOS switches off control circuit 100 velocity of discharge when PMOS tube can be accelerated to turn off comprising control unit 110
With switch unit 120.Discharge current when described control unit 110 is turned off according to pmos circuit 300 controls switch unit 120
Conducting makes the circuit electric discharge that discharge current passes through control unit 110 and switch unit 120 is formed, the circuit that can accelerate electric discharge electricity
The velocity of discharge of stream, to enable the PMOS tube in pmos circuit 300 to rapidly switch off.
In first embodiment of the invention, as shown in Figure 1, described control unit 110 includes first resistor R1 and the one or two pole
Pipe D1；One end of the first resistor R1 is the input terminal in that switch off control circuit of PMOS, and connection PMOS switches off control circuit 100
The first output end o1 and input circuit 200；The other end of first resistor R1 is connect with the anode of the first diode D1, this first
The other end of resistance R1 is the control terminal ctl that PMOS switches off control circuit, and connects pmos circuit 300 and control circuit 400；The
The cathode connecting valve unit 120 of one diode D1；
The switch unit 120 includes that the base stage of the first triode Q1, the first triode Q1 connects the first diode
The cathode of D1；The current collection extremely PMOS of first triode Q1 switch off control circuit 100 the first output end o1, connection PMOS tube electricity
Road 300；The transmitting extremely PMOS of first triode Q1 switch off control circuit 100 second output terminal o2, connect pmos circuit
300。
The input circuit 200 includes one end connection PMOS shutdown control electricity of the first capacitance C1, the first capacitance C1
The input terminal on road（That is one end of first resistor R1）, the other end ground connection of the first capacitance C1.
The pmos circuit 300 includes PMOS tube Qp, second resistance R2,3rd resistor R3 and the second capacitance C2；It is described
The source electrode of PMOS tube Qp connect one end of the second capacitance C2, one end of second resistance R2 and PMOS switch off control circuit 100 the
One output end o1（That is the collector C of the first triode Q1）, the other end of the second capacitance C2 of grid connection of PMOS tube Qp, second
The other end of resistance R2, one end of 3rd resistor R3 and PMOS switch off control circuit 100 second output terminal o2（That is the one or three pole
The emitter E of pipe Q1）, the drain electrode connection output circuit 500 of PMOS tube Qp, the passes other end connection PMOS of the 3rd resistor R3
The control terminal ctl of disconnected control circuit 100（That is the anode of the first diode D1）With control circuit 400.
The control circuit 400 includes the second triode Q2, the base stage input control signal of the second triode Q2, and the
The emitter of two triode Q2 is grounded, the collector connection PMOS of the second triode Q2 switch off control circuit 100 control terminal ctl
With the other end of 3rd resistor R3.
The output circuit 500 includes the drain electrode of one end connection PMOS tube of third capacitance C3, the third capacitance C3, the
The other end of three capacitance C3 is grounded.
Wherein, the second capacitance C2 is to prevent external interference PMOS tube Qp from working normally, or while powering on keeps PMOS tube Qp slow
The capacitance being excessively added to saturation region by amplification region, this capacitance are generally tens to hundreds of nanofarads.Second resistance R2 and third
Resistance R3 composition series connection potential-divider networks, resistance value are generally up to tens K or up to a hundred K.The input for electric installation is+12VA, output
For+12V, centre is separated by PMOS tube, and the conducting of PMOS and cut-off are then by control signal ON/OFF control.When control signal
When ON/OFF is high level H, PMOS tube conducting；When it is low level L to control signal ON/OFF, PMOS tube cut-off.Specially：
When controlling signal ON/OFF=H, the second triode Q2 conductings, second resistance R2 and 3rd resistor R3 are to input electricity
Pressure+12VA is divided；And the parasitic capacitance C of the second capacitance C2 and PMOS tube QpGSBoth ends are charged to second resistance R2 energy
The voltage swing assigned to.By circuit theory it is found that | VGS|=VC2=VR2.When | VGS| reach at or above the turn-on threshold of PMOS tube Qp
Value VthAfterwards, PMOS tube Qp will be connected.
Conversely, when controlling signal ON/OFF=L, the second triode Q2 cut-offs, PMOS tube Qp cut-offs to be made, then | VGS| it must
V must be dropped belowth.Since the capacity of the second capacitance C2 is bigger, and the resistance value of second resistance R2 is bigger, therefore the second electricity
The velocity of discharge for holding C2 is slow, i.e., | VGS|=VC2To pass through the long time can just drop to VthHereinafter, then causing in this way
A period of time can be also connected in PMOS tube Qp, cannot immediately turn off.Audio can also be worked normally（Because dropping to 8V also from 10V needs
For a period of time）, this time is interior if there is noise enters audio input terminals, then just will appear explosion sound；Therefore, work as control
When signal ON/OFF processed loses, needs immediately to turn off PMOS tube Qp, make+12V quickly power-down to 8V or less.
In order to solve the problems, such as that PMOS tube Qp cannot be rapidly switched off, the present embodiment increases PMOS and switches off control circuit 100
To itself parasitic capacitance C of the second capacitance C2 and PMOS tube QpGSRepid discharge is carried out, i.e., is quickly made | VGS| V is dropped to rapidlythBelow.
When PMOS tube Qp conducting normal work, the network being made of first resistor R1, the first diode D1 and the first triode Q1 is simultaneously
It does not all participate in main circuit work, therefore it will not consume big energy constantly, to reduce the efficiency of entire circuit.
As shown in figure 3, when controlling signal ON/OFF=H, current loop trend such as I1 ~ I6 in circuit（Dotted line）It is shown.Its
In, the first triode Q1 cut-offs, I2, I3, I4, I5 are due to resistance in the circuit of composition（R1、R2、R3）Generally tens K are to upper
Hundred K, therefore its electric current is very small, you can think I1 ≈ I6.
As shown in figure 4, when controlling signal ON/OFF=L, the first triode Q1 is connected, the second capacitance C2 and PMOS tube Qp
Itself parasitic capacitance CGSDischarge current circuit move towards as shown in I11 ~ I15.First triode Q1 is tri- poles current-control type NPN
Pipe, ICE（That is I12）About tens to one hundred times of IBThe size of (i.e. I14).Therefore, to the second capacitance after the one or three pole Q1 conductings
Itself parasitic capacitance C of C2 and PMOS tube QpGSThe velocity of discharge can obviously accelerate, finally make | VGS| i.e. VC2 can quickly drop to VthWith
Under, make the rapid power down of+12V to rapidly switch off PMOS tube Qp.
In the first embodiment of the invention, it is contemplated that efficiency and resistance package size, the resistance value of first resistor R1 are bigger
（Tens is K ohm up to a hundred）.So if only can be slow with Q1 pairs of the second capacitance C2 electric discharge of the first triode.Further implementing
In example, as shown in figure 5, can a triode be further added by the basis of the first triode Q1 to organize stream architecture at double, you can big
The big velocity of discharge accelerated to the second capacitance C2, keeps the turn-off time of PMOS tube Qp shorter.Especially when the second capacitance C2 ratios
When larger, this effect is clearly.I.e. the switch unit 120 further includes third transistor Q3（PNP triode）, described
The base stage of three triode Q3 connects the collector of the first triode Q1, the transmitting extremely PMOS shutdown control electricity of third transistor Q3
The first output end o1 on road 100；The collector of third transistor Q3 connects the emitter of the first triode Q1, third transistor Q3
Current collection extremely PMOS switch off control circuit 100 second output terminal o2.
Above-mentioned first embodiment is mainly used for accelerating the velocity of discharge of the second capacitance C2, further, the present invention second
Embodiment, which switches off control circuit to PMOS, to be improved, input circuit 200, pmos circuit 300, control circuit 400 and output
The circuit structure of circuit 500 is constant.The circuit of second embodiment not only can carry out repid discharge to the second capacitance C2, can be with
It releases to the residual voltage of the first capacitance C1 in input circuit 200, to optimize performance and power consumption for electric installation.
Second embodiment of the invention is as shown in Figure 6 and Figure 7, and the PMOS switches off control circuit 100/In, the control is single
Member includes the 4th resistance R4, the 4th triode Q4 and the 4th capacitance C4；The switch unit 120 includes the first optocoupler U1.
One end of the 4th resistance R4 is the input terminal in that PMOS switches off control circuit, and connection PMOS switches off control circuit
100 the first output end o1 and input circuit 200；The other end of 4th resistance R4 connects the 1st foot of the first optocoupler U1, the first light
The 2nd foot of coupling U1 connects the collector of the 4th triode Q4；The base stage of 4th triode Q4 is the control that PMOS switches off control circuit
End ctl processed connects one end, the pmos circuit 300 of the 4th capacitance C4（That is the other end of 3rd resistor R3）With control circuit 400
（That is the collector of the second triode Q2）；The emitter of 4th triode Q4 connects the other end and ground of the 4th capacitance C4；First
The 3rd foot of optocoupler U1 be PMOS switch off control circuit 100 second output terminal o2；The 4th foot of first optocoupler U1 turns off for PMOS
First output end o1 of control circuit 100.
When control signal ON/OFF exports low level, then the second triode Q2 ends；Residual voltage on first capacitance C1
The 4th triode Q4 is driven by second resistance R2,3rd resistor R3（For NPN triode）Conducting, driving current I21.The
The light emitting diode U1-A conductings of first optocoupler U1 while four triode Q4 conductings, at this time by the first capacitance C1, the 4th resistance
The residual voltage for the first capacitance of bleed-off circuit pair C1 that R4, light emitting diode U1-A, the 4th triode Q4 are formed is discharged, and is put
Electric current is I22.At the same time, the phototriode U1-B of the first optocoupler can also be connected, and discharge the second capacitance C2, put
Electric current is I23（Shown in dotted line circuit）, to accelerate the shutdown to PMOS tube Qp.
Further, third embodiment of the invention changes its port and pmos circuit on the basis of second embodiment
300, the connection relation between control circuit 400 and output circuit 500, and increase by a resistance.The input circuit 200, PMOS
The circuit structure of pipe circuit 300, control circuit 400 and output circuit 500 is constant.The circuit of 3rd embodiment not only can be to
Two capacitance C2 carry out repid discharge, release to the residual voltage of the first capacitance C1 in input circuit 200, can also be to defeated
The residual voltage of the third capacitance C3 gone out in circuit 500 is released, and to keep the performance for electric installation more preferable, power consumption is lower.
Third embodiment of the invention is as shown in Figure 8 and Figure 9, and the PMOS switches off control circuit 100//In, the control is single
Member includes the 5th resistance R5, the 6th resistance R6, the 5th triode Q5 and the 5th capacitance C5；The switch unit includes the second optocoupler
U2。
One end of the 6th resistance R6 is the input terminal in that PMOS switches off control circuit, and connects pmos circuit 300（I.e.
The drain electrode of PMOS tube Qp）, the 5th resistance R5 one end and output circuit 500（That is the anode of third capacitance C3）；6th resistance R6
The other end connect the 5th triode Q5 base stage；The base stage of 5th triode Q5 is the control terminal that PMOS switches off control circuit
Ctl connects one end, the pmos circuit 300 of the 5th capacitance C5（That is the other end of 3rd resistor R3）With control circuit 400（I.e.
The collector of second triode Q2）；The other end of 5th capacitance C5 is grounded, the emitter ground connection of the 5th triode Q5, and the five or three
The collector of pole pipe Q5 connects the 2nd foot of the second optocoupler U2, and the 1st foot of the second optocoupler U2 connects the another of the 5th resistance R5
End, the 4th foot of the second optocoupler U2 be PMOS switch off control circuit 100 the first output end o1；The 3rd foot of second optocoupler U2 is
PMOS switch off control circuit 100 second output terminal o2.
When it is low level to control signal ON/OFF, the second triode Q2 ends, and the residual voltage on the first capacitance C1 is logical
Second resistance R2,3rd resistor R3 are crossed to drive the 5th triode Q5 conductings, driving current I33, then the first capacitance C1's is residual
Remaining voltage can be released by I33, and discharge loop is by the first capacitance C1, second resistance R2,3rd resistor R3, the 5th triode Q5 groups
At.
6th resistance R6 is reserved resistance, if having installed, the residual voltage on third capacitance C3 can pass through the 6th resistance
R6 drives the 5th triode Q5, driving current I32.5th triode Q5 conductings, while the light emitting diode of the second optocoupler
U2-A is connected, and the residual voltage on third capacitance C3 can pass through the 5th resistance R5, the light emitting diode U2-A of the second optocoupler, the 5th
It releases in the circuit that triode Q5, third capacitance C3 are formed.At the same time, the phototriode U2-B of the second optocoupler can also be led
It is logical, it discharges the second capacitance C2, discharge current I34（Shown in dotted line circuit）, accelerate the shutdown to PMOS tube Qp.
It is to be appreciated that the embodiment of the present invention is so that electric installation illustrates circuit knot that PMOS switches off control circuit
Structure and operation principle.In the specific implementation, PMOS switches off control circuit carries out switch control suitable for all by PMOS tube
Circuit.
In conclusion PMOS provided by the invention switches off control circuit and for electric installation, can rapidly switch off PMOS tube again
Fictitious load need not be aggravated, simple in structure, cost is relatively low, and performance is stablized；It solves existing necessary to rapidly switch off PMOS tube
The problem of aggravating fictitious load and then overall efficiency caused to reduce.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect range.
Claims (5)
1. a kind of PMOS switches off control circuit, which is characterized in that connection input circuit, pmos circuit, control circuit and output
Circuit, PMOS switch off control circuit including：Control unit and switch unit；
Discharge current when described control unit is turned off according to pmos circuit controls switching means conductive, and discharge current is made to pass through
The circuit electric discharge that control unit and switch unit are formed；
Described control unit includes the 5th resistance, the 6th resistance, the 5th triode and the 5th capacitance；The switch unit includes the
Two optocouplers；
One end of 6th resistance is the input terminals that switch off control circuit of PMOS, connection pmos circuit, the 5th resistance one
End and output circuit；The other end of 6th resistance connects the base stage of the 5th triode；The base stage of 5th triode turns off for PMOS
The control terminal of control circuit connects one end, pmos circuit and the control circuit of the 5th capacitance；Another termination of 5th capacitance
Ground, the emitter ground connection of the 5th triode, the collector of the 5th triode connect the 2nd foot of the second optocoupler, second optocoupler
The 1st foot connect the other end of the 5th resistance, the 4th foot of the second optocoupler is the first output end that PMOS switches off control circuit；The
3rd foot of two optocouplers is the second output terminal that PMOS switches off control circuit；
Residual voltage on input circuit drives the 5th triode ON, the residual voltage of input circuit by pmos circuit
It releases；Residual voltage on output circuit drives the 5th triode by the 6th resistance, the 5th triode ON, while second
The LEDs ON of optocoupler, the residual voltage on output circuit are released；The phototriode of second optocoupler is also switched on, right
Pmos circuit discharges.
2. a kind of for electric installation, including input circuit, pmos circuit, control circuit and output circuit, which is characterized in that also wrap
PMOS as described in claim 1 is included to switch off control circuit；
The input circuit is controlled according to control signal being transferred to pmos circuit, control circuit after the voltage filter of input
The break-make of pmos circuit；Output voltage exports after output circuit filters when pmos circuit is connected；PMOS shutdown control electricity
Road reduces the current drain of pmos circuit when pmos circuit is connected；PMOS tube electricity is also controlled when pmos circuit disconnects
It discharges on road.
3. according to claim 2 for electric installation, which is characterized in that the input circuit includes the first capacitance；It is described
Pmos circuit includes PMOS tube, second resistance, 3rd resistor and the second capacitance；Control circuit includes the second triode, output
Circuit includes third capacitance；
The input terminal that one end connection PMOS of first capacitance switches off control circuit, the other end ground connection of the first capacitance；It is described
The source electrode of PMOS tube connects the first output end that one end of the second capacitance, one end of second resistance and PMOS switch off control circuit,
The grid connection other end of the second capacitance, the other end of second resistance, one end of 3rd resistor and the PMOS shutdown controls of PMOS tube
The second output terminal of circuit processed；One end of the drain electrode connection third capacitance C3 of PMOS tube, the other end connection of the 3rd resistor
The collector of control terminal and the second triode Q2 that PMOS switches off control circuit, the base stage input control of the second triode Q2
Signal, the emitter ground connection of the second triode Q2.
4. a kind of for electric installation, including input circuit, pmos circuit, control circuit and output circuit, which is characterized in that also wrap
PMOS as described in claim 1 is included to switch off control circuit；The input terminal that the input circuit connection PMOS switches off control circuit,
The input terminal and pmos circuit that the first output end connection PMOS that PMOS switches off control circuit switches off control circuit, PMOS shutdowns
The second output terminal of control circuit connects pmos circuit, the control terminal connection pmos circuit and control that PMOS switches off control circuit
Circuit processed, pmos circuit connect control circuit；
The input circuit is controlled according to control signal being transferred to pmos circuit, control circuit after the voltage filter of input
The break-make of pmos circuit；Output voltage exports after output circuit filters when pmos circuit is connected；PMOS shutdown control electricity
Road reduces the current drain of pmos circuit when pmos circuit is connected；PMOS tube electricity is also controlled when pmos circuit disconnects
Road and input circuit electric discharge.
5. a kind of for electric installation, including input circuit, pmos circuit, control circuit and output circuit, which is characterized in that also wrap
PMOS as described in claim 1 is included to switch off control circuit；It is defeated that the input circuit connects PMOS switches off control circuit first
Outlet and pmos circuit, the input terminal connection pmos circuit and output circuit that PMOS switches off control circuit, PMOS shutdown controls
The second output terminal of circuit processed connects pmos circuit, the control terminal connection pmos circuit and control that PMOS switches off control circuit
Circuit；
The input circuit is controlled according to control signal being transferred to pmos circuit, control circuit after the voltage filter of input
The break-make of pmos circuit；Output voltage exports after output circuit filters when pmos circuit is connected；PMOS shutdown control electricity
Road reduces the current drain of pmos circuit when pmos circuit is connected；PMOS tube electricity is also controlled when pmos circuit disconnects
Road, input circuit and output circuit electric discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510864005.3A CN105406845B (en) | 2015-12-01 | 2015-12-01 | A kind of PMOS switches off control circuit and for electric installation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510864005.3A CN105406845B (en) | 2015-12-01 | 2015-12-01 | A kind of PMOS switches off control circuit and for electric installation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105406845A CN105406845A (en) | 2016-03-16 |
| CN105406845B true CN105406845B (en) | 2018-09-18 |
Family
ID=55472138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510864005.3A Active CN105406845B (en) | 2015-12-01 | 2015-12-01 | A kind of PMOS switches off control circuit and for electric installation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105406845B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253205B (en) * | 2016-09-07 | 2019-01-18 | 京信通信系统（中国）有限公司 | A kind of radio-frequency feed protection circuit |
| CN108667449A (en) * | 2017-03-27 | 2018-10-16 | 中芯国际集成电路制造(上海)有限公司 | Electronic system and its upper and lower electricity condition detection circuit |
| CN108268081A (en) * | 2018-02-06 | 2018-07-10 | 江苏华存电子科技有限公司 | A kind of attenuating out-put supply falls magnitude circuit |
| TWI709292B (en) * | 2019-02-13 | 2020-11-01 | 益力半導體股份有限公司 | Smart dummy load power comsumption system |
| JP7543653B2 (en) * | 2020-02-05 | 2024-09-03 | 株式会社デンソー | MOSFET driver circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103795385A (en) * | 2014-02-24 | 2014-05-14 | 南京航空航天大学 | Power tube drive method and circuit, and direct-current solid power controller |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7952419B1 (en) * | 2009-11-16 | 2011-05-31 | Analog Devices, Inc. | Bootstrapped switch circuit |
-
2015
- 2015-12-01 CN CN201510864005.3A patent/CN105406845B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103795385A (en) * | 2014-02-24 | 2014-05-14 | 南京航空航天大学 | Power tube drive method and circuit, and direct-current solid power controller |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105406845A (en) | 2016-03-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105406845B (en) | A kind of PMOS switches off control circuit and for electric installation | |
| CN103415905B (en) | Improved relay control method and device | |
| CN103384436B (en) | LED backlight constant current circuit | |
| CN107769535A (en) | A kind of soft-start circuit and power panel and service board comprising the circuit | |
| CN107069655A (en) | A kind of voltage protection circuit | |
| CN202586329U (en) | Self-discharge circuit | |
| CN102281683B (en) | LED anti-flash circuit | |
| CN207117156U (en) | A kind of voltage protection circuit | |
| CN107947543A (en) | Multi input component level Quick shut-off device and its drive circuit and photovoltaic system | |
| CN107066021A (en) | A kind of button multiplexing circuit and electronic equipment | |
| CN207743857U (en) | Multi input component level Quick shut-off device and its driving circuit and photovoltaic system | |
| CN206878798U (en) | A kind of Darlington transistor drive circuit | |
| CN202634338U (en) | Motor circuit with power off brake function | |
| CN107395184B (en) | Monitoring integrated diode array driving power soft switching circuit | |
| CN203911828U (en) | Drive plate control circuit | |
| CN206195611U (en) | Relay control circuit and switching power supply | |
| CN208939915U (en) | Drive circuit, power optimizer and photovoltaic system of floating switch tube | |
| CN203933461U (en) | A kind of reversing arrangement | |
| CN202798970U (en) | HDMI (high-definition multimedia interface) device | |
| CN209201040U (en) | A kind of switch driving circuit, controller and electronic equipment | |
| CN202145637U (en) | Silicon controlled rectifier driving circuit used for soybean milk machine | |
| CN205793164U (en) | ON-OFF control circuit and bluetooth earphone for bluetooth earphone | |
| CN106329965A (en) | Rectification circuit and dimming circuit | |
| CN106159874B (en) | Power-off protecting circuit | |
| CN206117995U (en) | A circuit for detection and control audio playback equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: Baolong Baolong Industrial City six road in Longgang District of Shenzhen City, Guangdong Province, No. 1 518031 Applicant after: SHENZHEN SKYWORTH QUNXIN SECURITY TECHNOLOGY CO., LTD. Address before: 518031 Guangdong city in Shenzhen Province, Futian District Huaqiang North Shijiezhichuang building block A 08G Applicant before: Chuangwei Quanxin Safety and Protection Science and Technology Co., Ltd., Shenzh |
|
| COR | Change of bibliographic data | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210824 Address after: 14 / F, block a, Skyworth building, Gaoxin South 1st Road, Nanshan District, Shenzhen, Guangdong 518000 Patentee after: SHENZHEN SKYWORTH DIGITAL TECHNOLOGY Co.,Ltd. Address before: 518031 No. 1, Baolong 6th Road, Baolong Industrial City, Longgang District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN SKYWORTH QUNXIN SECURITY TECHNOLOGY Co.,Ltd. |