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 PDF

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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
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CN
China
Prior art keywords
circuit
pmos
control
output
control circuit
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CN201510864005.3A
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Chinese (zh)
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CN105406845A (en
Inventor
颜宏
刘保
胡朝晖
张鑫
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深圳市创维群欣安防科技股份有限公司
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Priority to CN201510864005.3A priority Critical patent/CN105406845B/en
Publication of CN105406845A publication Critical patent/CN105406845A/en
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Publication of CN105406845B publication Critical patent/CN105406845B/en

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Classifications

    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/04Modifications for accelerating switching
    • H03K17/042Modifications for accelerating switching by feedback from the output circuit to the control circuit
    • H03K17/04206Modifications for accelerating switching by feedback from the output circuit to the control circuit in field-effect transistor switches
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/687Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors

Abstract

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

A kind of PMOS switches off control circuit and for electric installation

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.
CN201510864005.3A 2015-12-01 2015-12-01 A kind of PMOS switches off control circuit and for electric installation CN105406845B (en)

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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
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

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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

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US7952419B1 (en) * 2009-11-16 2011-05-31 Analog Devices, Inc. Bootstrapped switch circuit

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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

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