CN108462484A

CN108462484A - Flash driving circuit is exported from pump pressure overcurrent protective N pipes

Info

Publication number: CN108462484A
Application number: CN201810484512.8A
Authority: CN
Inventors: 杨明
Original assignee: Foshan China Micro Electric Technology Co Ltd
Current assignee: Foshan China Micro Electric Technology Co Ltd
Priority date: 2018-05-21
Filing date: 2018-05-21
Publication date: 2018-08-28

Abstract

It is a kind of to export flash driving circuit from pump pressure overcurrent protective N pipes, including：Switch control unit (1) connecting valve unit (2),Switch unit is also connected with positive pole,Its output end VO controls load power source,It is pumped energy-storage units (3) and connects positive pole,It is also connected with switch unit output end,It is pumped the pump pressure input terminal of the output end connecting valve control unit of energy-storage units,On off state identifies and feedback unit (4) connects positive pole,Switch unit output end (VO),On off state identifies and feedback unit output end connecting valve control unit input terminal,Load voltage recognition unit (5) connects output end (VO),Ground and energy storage delay unit (6) input terminal,The third end connection positive pole of energy storage delay unit or ground connection,Energy storage delay unit is also connected with the input terminal of reset unit,The common end grounding of reset unit (7),The common end of reset unit output end connecting valve control unit,With pump pressure certainly,Overcurrent protection function.

Description

Flash driving circuit is exported from pump pressure overcurrent protective N pipes

Technical field

The invention belongs to technical field of electromechanical control, and in particular to from pump pressure overcurrent protective N pipes output flash driving electricity Road.

Background technology

Input terminal is current main power control device, extensively in the power crystal element of the high input impedance of capacitive Control applied to the technical fields such as various electromechanical equipments, means of transportation and transport facility, household electrical appliances electronics, medical electronics In circuit.

If mos pipes are divided into two kinds of polarity of Nmos and Pmos, wherein p-type power tube in terms of high current, high back-pressure by work The restriction of skill and cost, can be less with selected model, and N-type only may be selected in many high currents, the control circuit of high voltage Power tube, but this just needs the flash output circuit driven to N-type power tube to add " pump pressure circuit ", so that selected N-type work( Obtaining sufficiently high gate source voltage between rate pipe grid source enables its saturation conduction.

Existing " pump pressure circuit ", generally uses two ways：First, providing one using special oscillating circuit is higher than it At least one cut-in voltage of source voltage or even the gate source voltage for making its depth be saturated, second is that without dedicated pump volt circuit but electricity Road can only realize bootstrapping pump pressure under the driving pulse of certain frequency, it is therein the first using relatively broad, but circuit is multiple Miscellaneous, pump pressure circuit is constantly in oscillatory regime and power consumption, makes circuit or chip Wen Sheng higher, increases energy consumption；Second of application It is limited, it is only used for the control impulse circuit of certain frequency range, it is impossible to be used in the DC level control of not pulse for a long time In circuit, because this, which will appear storage capacitor energy release in pump pressure circuit, makes power tube gate driving deficiency problem, power tube It can be damaged because leading to power consumption abruptly increase into amplification region.Moreover, these pump pressure circuits and overcurrent protection are altogether irrelevant, do not have more There is power tube grid voltage to drive insufficient defencive function, also needs separately adding power pipe overcurrent protection electric if circuit needs to protect Grid voltage driving not foot protection circuit is added on road, and circuit more complexity, the increase of circuit volume, cost increase, failure rate can be made to increase Add.

Therefore, it is necessary to develop can adapt in above-mentioned two situations can normal use, can be in Pulse Width Control Lower work can work under ultralow frequency or even DC level control again, while the line of the output of N pipes, flash driving may be implemented Road, which more simplifies, energy consumption is lower has automatic pump pressure, power tube overcurrent protection function, also drives not with power tube grid voltage The control circuit of foot protection function.

Invention content

It is an object of the present invention in view of the above technical problems, provide from pump pressure overcurrent protective N pipes output flash driving Circuit can work under Pulse Width Control and can work under ultralow frequency or even DC level control, may be implemented simultaneously N pipes, which export, the circuit of flash driving more simplifies, energy consumption is lower has automatic pump pressure, power tube overcurrent protection function, goes back The control circuit of insufficient defencive function is driven with power tube grid voltage.

According to the present invention in a first aspect, providing a kind of from pump pressure overcurrent protective N pipes output flash driving circuit, spy Different place is：Switch control unit (1), switch unit (2), pump pressure energy-storage units (3), on off state identification and anti- Unit (4), load voltage recognition unit (5), energy storage delay unit (6) and reset unit (7) are presented, wherein：

The switch control unit has input, output end, pump pressure input terminal and common end,

The switch unit has positive terminal, input terminal and output end,

The pump pressure energy-storage units have positive terminal, negative pole end and output end,

The on off state identification and feedback unit have positive terminal, input terminal and output end,

The load voltage recognition unit has input terminal, ground terminal and output end,

The energy storage delay unit has input, output end and third end,

The reset unit has input terminal, common end and output end；

The output end of the switch control unit connects the input terminal of the switch unit,

The positive terminal of the switch unit connects positive pole, and the output end of the switch unit is for controlling external loading Positive pole,

The positive terminal of the pump pressure energy-storage units connects positive pole, and negative pole end connects the switch unit output end, institute The output end for stating pump pressure energy-storage units connects the pump pressure input terminal of the switch control unit,

The positive terminal of the on off state identification and feedback unit connects positive pole, the on off state identification and feedback The input terminal of unit connects the output end of the switch unit, the on off state identification and the output end connection of feedback unit The input terminal of the switch control unit,

The input terminal of the load voltage recognition unit connects the output end of the switch unit, the load voltage identification The ground terminal of unit is grounded, and the output end of the load voltage recognition unit connects the input terminal of the energy storage delay unit,

The output end of the third end connection positive pole of the energy storage delay unit or ground connection, the energy storage delay unit connects The input terminal of the reset unit is connect,

The common end grounding of the reset unit, the output end of the reset unit connect the public affairs of the switch control unit End altogether；

When the input terminal of the switch control unit inputs first voltage, the switch control unit exports high potential So that the switch unit saturation conduction, the switch unit is exported high potential, load is made to obtain power supply；It is controlled when in the switch When the input terminal input second voltage of unit processed, the switch control unit output low potential makes the switch unit end, institute Switch unit output low potential is stated, load deenergization is made；In the normal saturation conduction of the switch unit, the switch shape When state identifies and feedback unit recognizes the saturation voltage drop of switch unit in the safe allowable range of electric current, the on off state Identification and feedback unit output tertiary voltage are simultaneously maintained by switch control unit control switch unit in saturation conduction Stable state；In the switch unit overcurrent, the on off state identification and feedback unit recognize switch unit saturation pressure When dropping permissible value safe more than electric current, the on off state identification and feedback unit export the 4th voltage and pass through the switch Control unit controls switch unit cut-off cut-out load current, and the switch unit is made to be protected, and then makes the load electricity Pressure recognition unit recognizes the upper no-voltage of load, and the load voltage recognition unit controls the energy storage delay unit and stops storage Time delayed signal can and be exported, the reset unit is maintained by the switch control unit under the action of time delayed signal The switch unit cut-off state；At the end of the delay of the energy storage delay unit, the energy storage delay unit output resets Signal, and so that the switch unit is resetted conducting again by the reset unit and switch control unit, if switch unit mistake Stream releases the stable state that then circuit enters the switch unit saturation conduction, if switch unit still overcurrent, reenters The delay protection process of switch unit cut-off；If since switch unit input terminal control undertension causes switch unit to exit When saturation enters amplification region, the switch unit tube voltage drop will trigger on off state identification and feedback unit output the Four voltages control switch unit cut-off by the switch control unit, and the switch unit is made to be protected；In the switch When unit ends or enters guard mode, the switch unit output terminal potential is dragged down by external loading, and then makes the energy storage Delay unit energy storage again, when reset signal arrives, switch unit restarts to be connected, inside the energy storage delay unit Institute's storing up electricity pressure and the switch unit output voltage Downward addition, realizing from pump pressure keeps the pump pressure energy-storage units output enough Cut-in voltage, and the N of the switch unit is made to manage reliable open and saturation conduction output high potential.

It is further preferred that flash driving circuit being exported from pump pressure overcurrent protective N pipes the present invention also provides a kind of, Be characterized in that including：

Switch control unit includes one end of the collector connection resistance R1 of triode Q1 and resistance R1, Q1 and as described The output end of switch control unit, the pump pressure input terminal of the other end of resistance R1 as switch control unit, the base of triode Q1 Input terminal of the pole as switch control unit, the common end of the emitter of triode Q1 as switch control unit,

Switch unit includes transistor Q2, the positive terminal of transistor Q2 to drain as the switch unit, grid conduct The input terminal of the switch unit, output end of the source electrode as the switch unit,

Pump pressure energy-storage units include diode D2 and capacitance C1, and the anode of diode D2 is as the pump pressure energy-storage units Positive terminal, the cathode of diode D2 and one end of capacitance C1 are connected to the output end of pump pressure energy-storage units, and capacitance C1's is another The negative pole end as pump pressure energy-storage units is held,

On off state identifies and feedback unit includes triode Q3 and resistance R2, R3, and the emitter of triode Q3 is as institute The positive terminal of on off state identification and feedback unit is stated, the base stage of triode Q3 is connected with the one end resistance R3, the resistance R3 other ends It is connected with one end of resistance R2 as on off state identification and the input terminal of feedback unit, the collector of triode Q3, resistance R2 The other end as on off state identify and feedback unit output end,

Load voltage recognition unit includes triode Q4, Q5 and resistance R4, R5, R6, and the base stage of triode Q5 connects resistance One end of R4, the input terminal of the other end of resistance R4 as the load condition recognition unit, the emitter conduct of triode Q5 Ground terminal, the collector of triode Q5 pass through resistance by the base stage of resistance R5 connecting triodes Q4, the emitter of triode Q4 R6 connection positive poles, the output end of the collector of triode Q4 as load voltage recognition unit,

Energy storage delay unit includes resistance R7 and capacitance C2, and one end of the one end resistance R7 and capacitance C2 are connected to the storage Can delay unit input terminal, the output end of the other end of resistance R7 as energy storage delay unit, the other end conduct of capacitance C2 The third end connection positive pole of energy storage delay unit or ground connection,

Reset unit includes triode Q8, and the input terminal of the base stage of triode Q8 as reset unit, emitter is as multiple The common end of bit location, output end of the collector as reset unit；

The output end of the energy storage delay unit connects the input terminal of the reset unit,

The common end grounding of the reset unit, the output end of the reset unit connect the public affairs of the switch control unit End altogether.

Second aspect according to the present invention provides a kind of from pump pressure overcurrent protective N pipes output flash driving circuit, spy Different place is：Switch control unit (1), switch unit (2), pump pressure energy-storage units (3), on off state identification and anti- Unit (4), load voltage recognition unit (5), energy storage delay unit (6) and reset unit (7) are presented, wherein：

The switch unit has positive terminal, input terminal and output end,

The load voltage recognition unit has input terminal and output end,

The energy storage delay unit has input, output end and third end,

The reset unit has input terminal, common end and output end；

The input terminal of the load voltage recognition unit connects the output end of the switch unit, the load voltage identification The output end of unit connects the input terminal of the energy storage delay unit,

When the input terminal of the switch control unit inputs first voltage, the switch control unit exports high potential So that the switch unit saturation conduction, the switch unit is exported high potential, load is made to obtain power supply；It is controlled when in the switch When the input terminal input second voltage of unit processed, the switch control unit output low potential makes the switch unit end, institute Switch unit output low potential is stated, load deenergization is made；In the normal saturation conduction of the switch unit, the switch shape When state identifies and feedback unit recognizes switch unit saturation voltage drop in the safe allowable range of electric current, the on off state is known Not and feedback unit exports tertiary voltage and controls switch unit by the switch control unit and maintains in the steady of saturation conduction Determine state；In the switch unit overcurrent, the on off state identification and feedback unit recognize switch unit saturation voltage drop When permissible value safe more than electric current, the on off state identification and feedback unit export the 4th voltage and are controlled by the switch Unit control switch unit cut-off cut-out load current processed, makes the switch unit be protected, and then make the load voltage Recognition unit recognizes the upper no-voltage of load, and the load voltage recognition unit controls the energy storage delay unit and stops energy storage And time delayed signal is exported, the reset unit maintains institute by the switch control unit under the action of time delayed signal State switch unit cut-off state；At the end of the delay of the energy storage delay unit, the energy storage delay unit output resets letter Number, and so that the switch unit is resetted conducting again by the reset unit and switch control unit, if switch unit overcurrent The stable state that then circuit enters the switch unit saturation conduction is released, if switch unit still overcurrent, reenters out Close the delay protection process of unit cut-off；If since to cause switch unit to exit full for switch unit input terminal control undertension When with entering amplification region, the switch unit tube voltage drop will trigger the on off state identification and feedback unit output the 4th Voltage controls switch unit cut-off by the switch control unit, and the switch unit is made to be protected；It is single in the switch When member ends or enters guard mode, the switch unit output terminal potential is dragged down by external loading, and then the energy storage is made to prolong Shi Danyuan energy storage again, when reset signal arrives, switch unit restarts to be connected, institute inside the energy storage delay unit Storing up electricity is pressed makes the pump pressure energy-storage units export enough with the switch unit output voltage Downward addition, realization from pump pressure Cut-in voltage, and so that the N of the switch unit is managed reliable simultaneously saturation conduction of opening and export high potential.

Load voltage recognition unit includes diode D3, and the anode of diode D3 is as the load condition recognition unit Input terminal, the output end of the cathode of diode D3 as load voltage recognition unit,

The third aspect according to the present invention provides a kind of from pump pressure overcurrent protective N pipes output flash driving circuit, spy Different place is：Switch control unit (1), switch unit (2), pump pressure energy-storage units (3), on off state identification and anti- Unit (4), load voltage recognition unit (5), energy storage delay unit (6) and reset unit (7) are presented, wherein：

The switch unit has positive terminal, input terminal and output end,

The energy storage delay unit has input, output end and third end,

The reset unit has first input end, the second input terminal and output end；

The output end of the switch control unit connects the input terminal of the switch unit, the public affairs of the switch control unit End ground connection altogether,

The positive terminal of the on off state identification and feedback unit connects positive pole, the on off state identification and feedback The input terminal of unit connects the output end of the switch unit, the on off state identification and the output end connection of feedback unit Second input terminal of the reset unit,

The output end of the third end connection positive pole of the energy storage delay unit or ground connection, the energy storage delay unit connects The first input end of the reset unit is connect,

The output end of the reset unit connects the input terminal of the switch control unit；

Reset unit includes triode Q9 and Q10, and the collector of triode Q9 is connected with the base stage of Q10, triode Q9's Emitter is grounded, and the first input end of the base stage of triode Q9 as reset unit, the emitter of triode Q10 is as reset Second input terminal of unit, the output end of the collector of triode Q10 as reset unit；

The output end of the reset unit connects the input terminal of the switch control unit.

Fourth aspect according to the present invention provides a kind of overcurrent protective N pipes of pump pressure certainly output flash driving circuit, It is characterized in that including：Switch control unit (1), switch unit (2), pump pressure energy-storage units (3), on off state identification And feedback unit (4), load voltage recognition unit (5), energy storage delay unit (6) and reset unit (7), wherein：

The switch unit has positive terminal, input terminal and output end,

The energy storage delay unit has input, output end and third end,

The reset unit has input terminal, common end and output end；

The output end of the common end grounding of the reset unit, the reset unit connects the defeated of the switch control unit Enter end；

Reset unit includes triode Q6, Q7 and resistance R8, the input terminal of the base stage of triode Q7 as reset unit, and three The common end that the emitter of pole pipe Q6 is connected with the emitter of Q7 as reset unit, the collector of triode Q6 is as multiple The collector of the output end of bit location, triode Q7 connects with the base stage of triode Q6 and by resistance R8 connection positive pole；

The output end of the common end grounding of the reset unit, the reset unit connects the defeated of the switch control unit Enter end.

Further, flash driving circuit being exported from pump pressure overcurrent protective N pipes the present invention also provides a kind of, it is special Place is, further includes that the anode of diode D4 and capacitance C4, the diode D4 connect the output of the pump pressure energy-storage units End, the cathode of the diode D4 connects one end of the pump pressure input terminal and capacitance C4 of the switch control unit simultaneously, described The other end of capacitance C4 is grounded or connection positive pole.

The beneficial effects of the invention are as follows：Technical scheme of the present invention can work under Pulse Width Control and can be ultralow Frequency or even the lower work of DC level control, at the same the output of N pipes may be implemented, the circuit of flash driving more simplifies, energy consumption is relatively low With automatic pump pressure, power tube overcurrent protection function, also there is power tube grid voltage driving deficiency defencive function.

Description of the drawings

Fig. 1 is a kind of overcurrent protective N pipes of pump pressure certainly output flash driving that embodiment of the present invention first aspect provides Circuit block diagram；

Fig. 2 is a kind of overcurrent protective N pipes of pump pressure certainly output flash driving that embodiment of the present invention first aspect provides Circuit structural schematic diagram；

Fig. 3 is that another overcurrent protective N pipes of the pump pressure certainly output flash that embodiment of the present invention first aspect provides drives Dynamic circuit block diagram；

Fig. 4 is that another overcurrent protective N pipes of the pump pressure certainly output flash that embodiment of the present invention first aspect provides drives Dynamic circuit structural schematic diagram；

Fig. 5 is a kind of overcurrent protective N pipes of pump pressure certainly output flash driving that embodiment of the present invention second aspect provides Circuit block diagram；

Fig. 6 is a kind of overcurrent protective N pipes of pump pressure certainly output flash driving that embodiment of the present invention second aspect provides Circuit structural schematic diagram；

Fig. 7 is a kind of overcurrent protective N pipes of pump pressure certainly output flash driving that the embodiment of the present invention third aspect provides Circuit block diagram；

Fig. 8 is a kind of overcurrent protective N pipes of pump pressure certainly output flash driving that the embodiment of the present invention third aspect provides Circuit structural schematic diagram；

Fig. 9 is a kind of overcurrent protective N pipes of pump pressure certainly output flash driving that embodiment of the present invention fourth aspect provides Circuit block diagram；

Figure 10 is a kind of overcurrent protective N pipes of pump pressure certainly output flash driving that embodiment of the present invention fourth aspect provides Circuit structural schematic diagram；

Figure 11 is a kind of pump pressure accumulator that embodiment of the present invention provides.

Specific implementation mode

Technical scheme of the present invention, which creatively realizes, can work under Pulse Width Control and can be in ultralow frequency Control lower work to DC level, at the same the output of N pipes may be implemented, the circuit of flash driving more simplifies, the lower tool of energy consumption There are automatic pump pressure, power tube overcurrent protection function, the control circuit also with the insufficient defencive function of power tube grid voltage driving.

In a first aspect, exporting flash driving circuit from pump pressure overcurrent protective N pipes the present invention provides two kinds.

Embodiment 1

A kind of circuit block diagram such as Fig. 1 institutes from pump pressure overcurrent protective N pipes output flash driving circuit of first aspect Show：It is a kind of to export flash driving circuit from pump pressure overcurrent protective N pipes, including：Switch control unit (1), switch unit (2), It is pumped energy-storage units (3), on off state identification and feedback unit (4), load voltage recognition unit (5), energy storage delay unit (6) and reset unit (7), wherein：

Switch control unit has input, output end, pump pressure input terminal and common end,

Switch unit has positive terminal, input terminal and output end,

Being pumped energy-storage units has positive terminal, negative pole end and output end,

On off state identifies and feedback unit has positive terminal, input terminal and output end,

Load voltage recognition unit has input terminal, ground terminal and output end,

Energy storage delay unit has input, output end and third end,

Reset unit has input terminal, common end and output end；

The input terminal of the output end connecting valve unit of switch control unit,

The positive terminal of switch unit connects positive pole, and the output end of switch unit is being used to control the power supply of external loading just Pole,

The positive terminal for being pumped energy-storage units connects positive pole, and negative pole end connecting valve unit output end is pumped energy storage list The pump pressure input terminal of the output end connecting valve control unit of member,

On off state identify and feedback unit positive terminal connect positive pole, on off state identification and feedback unit it is defeated Enter to hold the output end of connecting valve unit, the output end connecting valve control unit of on off state identification and feedback unit it is defeated Enter end,

The output end of the input terminal connecting valve unit of load voltage recognition unit, the ground terminal of load voltage recognition unit Ground connection, the input terminal of the output end connection energy storage delay unit of load voltage recognition unit,

The output end connection of the third end connection positive pole of energy storage delay unit or ground connection, energy storage delay unit resets list The input terminal of member,

The common end grounding of reset unit, the common end of the output end connecting valve control unit of reset unit；

When the input terminal of switch control unit inputs first voltage, switch control unit output high potential makes switch list First saturation conduction, switch unit export high potential, and load is made to obtain power supply；When the input terminal input the in switch control unit When two voltage, switch control unit output low potential makes switch unit end, and switch unit exports low potential, and load is made to disconnect Power supply；In the normal saturation conduction of switch unit, on off state identification and feedback unit recognize the saturation voltage drop of switch unit When in the safe allowable range of electric current, on off state identification and feedback unit export tertiary voltage and pass through switch control unit Control switch unit maintains the stable state in saturation conduction；In switch unit overcurrent, on off state identification and feedback unit When recognizing switch unit saturation voltage drop more than the safe permissible value of electric current, the 4th electricity of on off state identification and feedback unit output It presses and switch unit cut-off cut-out load current is controlled by switch control unit, so that switch unit is protected, and then make to bear It carries voltage identification unit and recognizes the upper no-voltage of load, load voltage recognition unit controls energy storage delay unit and stops energy storage simultaneously Time delayed signal is exported, reset unit maintains switch unit cut-off state by switch control unit under the action of time delayed signal； At the end of the delay of energy storage delay unit, energy storage delay unit output reset signal, and controlled by reset unit and switch Unit makes switch unit reset conducting again, and circuit access switch unit saturation conduction is steady if switch unit overcurrent releases Determine state, if switch unit still overcurrent, reenters the delay protection process of switch unit cut-off；If since switch is single When first input terminal control undertension causes switch unit to exit saturation into amplification region, switch unit tube voltage drop will trigger On off state identifies and feedback unit exports the 4th voltage and controls switch unit cut-off by switch control unit, makes switch list Member is protected；When switch unit ends or enters guard mode, switch unit output terminal potential is dragged down by external loading, And then make the energy storage again of energy storage delay unit, when reset signal arrives, switch unit restarts to be connected, and energy storage delay is single First internal institute storing up electricity is pressed and switch unit output voltage Downward addition, and realizing from pump pressure makes pump pressure energy-storage units export enough Cut-in voltage, and so that the N of switch unit is managed reliable simultaneously saturation conduction of opening and export high potential.

Fig. 2 is a kind of overcurrent protective N pipes of pump pressure certainly output flash driving that embodiment of the present invention first aspect provides Circuit structural schematic diagram：

As shown in Fig. 2, a kind of exporting flash driving circuit from pump pressure overcurrent protective N pipes, including：

Switch control unit includes one end of the collector connection resistance R1 of triode Q1 and resistance R1, Q1 and as switch The base stage of the output end of control unit, the pump pressure input terminal of the other end of resistance R1 as switch control unit, triode Q1 is made For the input terminal of switch control unit, the common end of the emitter of triode Q1 as switch control unit,

Switch unit includes transistor Q2, and the positive terminal of transistor Q2 to drain as switch unit, grid is as switch The input terminal of unit, output end of the source electrode as switch unit,

Pump pressure energy-storage units include diode D2 and capacitance C1, and the anode of diode D2 is as the anode for being pumped energy-storage units End, the cathode of diode D2 and one end of capacitance C1 are connected to the output end of pump pressure energy-storage units, and the other end of capacitance C1 is made To be pumped the negative pole end of energy-storage units,

On off state identifies and feedback unit includes triode Q3 and resistance R2, R3, and the emitter of triode Q3, which is used as, to be opened Off status identifies and the positive terminal of feedback unit, the base stage of triode Q3 are connected with the one end resistance R3, resistance R3 other end conducts On off state identifies and the input terminal of feedback unit, the collector of triode Q3 are connected with one end of resistance R2, and resistance R2's is another One end is identified as on off state and the output end of feedback unit,

Energy storage delay unit includes resistance R7 and capacitance C2, and one end of the one end resistance R7 and capacitance C2 are connected to energy storage and prolong The input terminal of Shi Danyuan, the output end of the other end of resistance R7 as energy storage delay unit, the other end of capacitance C2 is as energy storage The third end of delay unit is grounded,

The input terminal of the output end connection reset unit of energy storage delay unit,

The common end grounding of reset unit, the common end of the output end connecting valve control unit of reset unit.

Operation principle is：

External loading is connected between the flash output end VO of circuit and ground (E), is powered on what circuit had just powered on Moment, positive pole B+ are that capacitance C1 charges by isolating diode D2, external load (being not shown in attached drawing), general electricity It is smaller to hold C1 capacity, can be determined between 1nF~100nF and (be certainly not limited to this range), the capacity of C1 should be with power tube The gate-source junctions capacitance of Q2 is positively correlated.Therefore, abundance makes its electrode potential difference be UC1 to C1 quickly, and positive pole also passes through resistance R1 provides grid voltage for power tube Q2, and Q2 is begun to turn on, and with the conducting of Q2, source voltage can improve, such capacitance The cathode voltage of C1 increases, and then the cathode voltage of C1 is made to increase, this voltage having built up is work(by resistance R1 Rate pipe Q2 grids provide a higher current potential, and Q2 is made further deeply to be connected, when the Q1 base stages in switch control unit When inputting the control signal of high-impedance state, Q1 cut-offs, switch control unit exports high potential UQ2g, this high potential is close to capacitance The sum of C1 charging potentials UC1 and switch control unit output high potential UQ2s,

I.e.：UQ2g ≈ UC1+UQ2s, this can make the thorough saturation conduction of switch unit, switch unit export high electricity at the ends VO Position makes load obtain power supply, certainly, as routine techniques can between grid source electrode limited amplitude protection diode D1 in parallel.

Due to the saturation conduction of power tube Q2, conduction voltage drop is relatively low, is not enough to trigger Q3 conductings by resistance R3, therefore Electric current on resistance R is 0, can be by the method for such as conduction threshold of increase Q3, in resistance R3 in order to improve circuit stability On series voltage stabilizing diode again.Meanwhile the high potential of output end VO is also connected triode Q4, Q3, the collector of triode Q3 So that triode Q8 is connected by resistance R7, triode Q1 emitters is made to be grounded by Q8.Capacitance C2 is electrically charged simultaneously.

When the base stage of the Q1 in switch control unit, which inputs one, makes the second voltage that Q1 emitter junctions are connected, switch control The Q1 output low potentials of unit make switch unit Q2 end, and VO exports low potential, makes load deenergization；In switch unit Q2 When normal saturation conduction, the Q3 of on off state identification and feedback unit recognizes the saturation voltage drop of switch unit in electric current safety When in allowable range, Q2 conduction voltage drops are relatively low, are not enough to trigger Q3 conductings, on off state identification and feedback by resistance R3 The tertiary voltage of member output high-impedance state makes Q1 end, i.e.,：Switch unit is controlled by switch control unit to maintain in saturation conduction Stable state；In switch unit Q2 overcurrents, Q3 emitter junctions recognize switch unit saturation voltage drop to be allowed safely more than electric current When value, Q2 conduction voltage drops increase, and reach and are enough to trigger Q3 conductings by resistance R3, on off state identification at this time and feedback unit The 4th voltage is exported, so that Q1 is connected by its resistance R2, and then Q2 is made to end, i.e.,：It is single that switch is controlled by switch control unit Member cut-off cut-out load current, makes switch unit be protected；Meanwhile external load drags down VO terminal voltages, pump pressure capacitance C1 is obtained To recharge.When the Q5 of load voltage recognition unit recognizes the upper no-voltage of load, Q4, Q5 are turned off, and load voltage is made to know Other unit control energy storage delay unit stops energy storage.Capacitance C2 is discharged over the ground by resistance R7 and triode Q8 emitters at this time, Discharge time length determines by R7C2, as delay time, i.e.,：Time delayed signal is exported, is resetted under the action of time delayed signal single Member maintains switch unit cut-off state by switch control unit；At the end of the delay of energy storage delay unit, the release of C2 charges Terminate, triode Q8 cut-offs, therefore Q1 earth-return circuits are ended, the pump pressure of the upper ends C1 superposition makes power tube again through resistance R1 Q2 restores the process " from pump pressure conducting ", i.e.,：Energy storage delay unit output reset signal, and controlled by reset unit and switch Unit makes switch unit reset conducting again.Hereafter, the circuit access switch unit saturation conduction if switch unit overcurrent releases Stable state, if switch unit still overcurrent, reenter switch unit cut-off delay protection process；If due to opening When closing unit input terminal control undertension causes switch unit to exit saturation into amplification region, the excessively high pipe of switch unit Trigger switch state recognition is equally understood in pressure drop and feedback unit exports the 4th voltage and controls switch unit by switch control unit Cut-off, makes switch unit be protected；When switch unit ends or enters guard mode, it is outer that switch unit exports terminal potential Section load drags down, and then makes the energy storage again of energy storage delay unit, and when reset signal arrives, switch unit restarts to be connected, Institute's storing up electricity pressure and switch unit output voltage Downward addition inside energy storage delay unit, realizing from pump pressure keeps pump pressure energy-storage units defeated Go out enough cut-in voltages, and so that the N of switch unit is managed reliable simultaneously saturation conduction of opening and export high potential.It is well known that being gram It takes transistor junction capacitance and improves circuit response, such as low capacity capacitance can be added between transistor Q4, Q8 base stage, specifically Capacitance values by via experiment calibration determine, and in order to make triode operation reliability stabilization can also be on its emitter junction simultaneously The Normal practice of big valued resistor is connect, this will not be repeated here, is such in follow-up several embodiments.

The circuit can work under the control of DC level, can also the pulse signal of certain frequency control under work Make, such as in VIN terminal input high levels, power tube Q2 will end output high potential, load dead electricity, such as defeated in VIN terminals When entering high-impedance state signal (or by resistance in VIN terminal input low levels signal), the automatic power tube Q2 that switchs to is saturated by circuit Conducting state, if since the time is longer (such as the time of experience reaches several seconds, tens of seconds etc.), the charge warp of capacitance C1 storages Gate-source junctions capacitance transfer to the power tube Q2 of relatively high power, if occur being insufficient to allow power tube Q2 saturation conductions, Q2 is upper High drain-source voltage will trigger Q3 the 4th voltages of output makes Q1 conductings be grounded by Q8 through resistance R2, and power tube ends to obtain Protection, makes pump pressure capacitance C1 recharge energy storage, and then circuit is automatically converted to power tube Q2 saturation conduction states, realizes certainly Pump pressure, from conducting, overcurrent protection (and grid voltage not foot protection), flash output, efficiently solve especially high current, high voltage Applications N-type power tube overcurrent protection actuation techniques problem, electric circuit characteristic of the present invention is：It is simple in structure, overturning it is fast Speed, member reduce, are small, at low cost, highly reliable, can be applied to a variety of DC level driving circuits, low frequency or ultralow frequency Driving circuit, pulse driving circuit, intermittent pulses driving circuit, just there is higher application value.

Embodiment 2

Another circuit block diagram such as Fig. 3 from pump pressure overcurrent protective N pipes output flash driving circuit of first aspect It is shown：Fig. 3 is by the ground terminal reconfiguration of the energy storage delay unit in Fig. 1 to positive pole, operation principle and 1 base of earlier figures This is consistent.

Fig. 4 is that another overcurrent protective N pipes of the pump pressure certainly output flash that embodiment of the present invention first aspect provides drives Dynamic circuit structural schematic diagram：Fig. 4 is by the ground terminal reconfiguration of the energy storage delay unit in Fig. 2 to positive pole, work Principle and earlier figures 2 are almost the same.Difference lies in, Fig. 4 is when transistor Q3 is connected, and storage capacitor C3 will not be electrically charged, and When power tube Q2 ends, external load drags down the current potential of output end VO, and Q5, Q4 are turned off, at this time positive pole start for Capacitance C3 chargings, charging current has connected the electric current of triode Q8 through resistance R7 and transistor Q8 emitter junctions, when capacitance C3 fills Electricity terminates, and triode Q8, Q1 end in succession, and pump pressure voltage makes power tube Q2 reset conducting from pump pressure through resistance R1.This process Circuit with Fig. 2 is comparatively, be the positive terminal for the ground terminal of C2 in Fig. 2 being become C3 in Fig. 4, " C2's puts in Fig. 2 Electric process connects Q8 base currents " become in Fig. 4 " charging process of C3 connects Q2 base currents ", " Q3 is connected in Fig. 2 C2 is set to charge " become in Fig. 4 " Q3 conductings make C3 discharge ", structure change, relevant capacitor charge and discharge process dystopy, but to crystalline substance The delays time to control of body pipe Q8, the reseting procedure function and effect of circuit are the same.The structure and original of remaining circuit and Fig. 2 circuits Reason is consistent.

Second aspect exporting flash driving circuit the present invention provides a kind of from pump pressure overcurrent protective N pipes.

Embodiment 3

A kind of circuit block diagram such as Fig. 5 institutes from pump pressure overcurrent protective N pipes output flash driving circuit of second aspect Show：It is a kind of to export flash driving circuit from pump pressure overcurrent protective N pipes, including：Switch control unit (1), switch unit (2), It is pumped energy-storage units (3), on off state identification and feedback unit (4), load voltage recognition unit (5), energy storage delay unit (6) and reset unit (7), wherein：

Switch unit has positive terminal, input terminal and output end,

Load voltage recognition unit has input terminal and output end,

Energy storage delay unit has input, output end and third end,

Reset unit has input terminal, common end and output end；

The output end of the input terminal connecting valve unit of load voltage recognition unit, the output end of load voltage recognition unit The input terminal of energy storage delay unit is connected,

When the input terminal of switch control unit inputs first voltage, switch control unit output high potential makes switch list First saturation conduction, switch unit export high potential, and load is made to obtain power supply；When the input terminal input the in switch control unit When two voltage, switch control unit output low potential makes switch unit end, and switch unit exports low potential, and load is made to disconnect Power supply；In the normal saturation conduction of switch unit, on off state identification and feedback unit recognize switch unit saturation voltage drop and exist When in the safe allowable range of electric current, on off state identification and feedback unit export tertiary voltage and pass through switch control unit control Switch unit processed maintains the stable state in saturation conduction；In switch unit overcurrent, on off state identification and feedback unit are known When being clipped to switch unit saturation voltage drop more than the safe permissible value of electric current, on off state identification and feedback unit export the 4th voltage And switch unit cut-off cut-out load current is controlled by switch control unit, so that switch unit is protected, and then make load Voltage identification unit recognizes the upper no-voltage of load, and the control energy storage delay unit stopping energy storage of load voltage recognition unit is simultaneously defeated Go out time delayed signal, reset unit maintains switch unit cut-off state by switch control unit under the action of time delayed signal；When At the end of the delay of energy storage delay unit, energy storage delay unit output reset signal, and it is single by reset unit and switch control Member makes switch unit reset conducting again, the stabilization of circuit access switch unit saturation conduction if switch unit overcurrent releases State reenters the delay protection process of switch unit cut-off if switch unit still overcurrent；If due to switch unit When input terminal control undertension causes switch unit to exit saturation into amplification region, switch unit tube voltage drop will trigger open Off status identifies and feedback unit exports the 4th voltage and controls switch unit cut-off by switch control unit, makes switch unit It is protected；When switch unit ends or enters guard mode, switch unit output terminal potential is dragged down by external loading, into And make the energy storage again of energy storage delay unit, when reset signal arrives, switch unit restarts to be connected, energy storage delay unit Internal institute's storing up electricity pressure and switch unit output voltage Downward addition, realizing from pump pressure makes the output of pump pressure energy-storage units is enough to open Voltage is opened, and so that the N of switch unit is managed reliable simultaneously saturation conduction of opening and exports high potential.

Fig. 6 is a kind of overcurrent protective N pipes of pump pressure certainly output flash driving that embodiment of the present invention second aspect provides Circuit structural schematic diagram, it is a kind of to export flash driving circuit from pump pressure overcurrent protective N pipes, including：

Load voltage recognition unit includes diode D3, the input of the anode of diode D3 as load condition recognition unit End, the output end of the cathode of diode D3 as load voltage recognition unit, this load voltage identification circuit are equally applicable to Among the other embodiment of the present invention.

Energy storage delay unit includes resistance R7 and capacitance C2, and one end of the one end resistance R7 and capacitance C2 are connected to energy storage and prolong The input terminal of Shi Danyuan, the output end of the other end of resistance R7 as energy storage delay unit, the other end of capacitance C2 is as energy storage The third end connection positive pole of delay unit or ground connection (one end ground connection that C2 is merely shown as in figure),

The operation principle of the circuit and Fig. 2's is almost the same, is a difference in that with diode D3 instead of original load Voltage identification circuit, when obtaining the power supply of power tube output in load, diode D3 charges for C2, is also made by resistance R7 Triode Q8 conductings, are ready for overcurrent protection.When power tube ends, D3 stops out-put supply anode, and C2 is started simultaneously at Q8 is maintained by resistance R7 and connects conducting, when C2 discharge offs, Q8 cut-offs, Q1 is made to end in succession, in pump pressure capacitance C1 effects certainly Lower Q2 can restore to be connected again.

The third aspect exporting flash driving circuit the present invention provides a kind of from pump pressure overcurrent protective N pipes.

Embodiment 4

A kind of circuit block diagram such as Fig. 7 institutes from pump pressure overcurrent protective N pipes output flash driving circuit of the third aspect Show：It is a kind of to export flash driving circuit from pump pressure overcurrent protective N pipes, including：Switch control unit (1), switch unit (2), It is pumped energy-storage units (3), on off state identification and feedback unit (4), load voltage recognition unit (5), energy storage delay unit (6) and reset unit (7), wherein：

Switch unit has positive terminal, input terminal and output end,

Energy storage delay unit has input, output end and third end,

Reset unit has first input end, the second input terminal and output end；

The input terminal of the output end connecting valve unit of switch control unit, the common end grounding of switch control unit,

On off state identify and feedback unit positive terminal connect positive pole, on off state identification and feedback unit it is defeated Enter to hold the output end of connecting valve unit, the second of the output end connection reset unit of on off state identification and feedback unit is defeated Enter end,

The output end connection of the third end connection positive pole of energy storage delay unit or ground connection, energy storage delay unit resets list The first input end of member,

The input terminal of the output end connecting valve control unit of reset unit；

Fig. 8 is a kind of overcurrent protective N pipes of pump pressure certainly output flash driving that the embodiment of the present invention third aspect provides Circuit structural schematic diagram, it is a kind of to export flash driving circuit from pump pressure overcurrent protective N pipes, including：

The input terminal of the output end connecting valve control unit of reset unit.

The difference of the circuit and Fig. 2 circuits is：By reset unit from the emitter circuit reconfiguration of Q1 to base loop, also Be Fig. 2 it is " tandem " time-delay reset carried out from the emitter circuit of Q1, and Fig. 8 is carried out from the base loop of Q1 The time-delay reset of " tandem ".When power tube Q2 normallies, triode Q3 cut-offs, therefore triode Q10 cut-offs, Q1 bases Pole cannot can not obtain the voltage from R7 from the voltage of Q10 by Q9, and Q1 cut-offs is made to maintain power tube Q2 conductings. When power tube overcurrent, Q3 can be connected, and since the voltage on R7 can be such that Q9 emitter junctions are connected, the Q3 be connected at this time can be through Cross R2 for Q10 provide base current make its to Q1 base stages be connected, so that Q1 is connected in this way, Q1 conducting make power tube Q2 end to obtain Protection.Equally, as capacitance C2 electric discharges terminate, triode Q9 can enter cut-off, and Q10, Q1 is made to end in succession, and Q2 is then from pump Ballast newly restores to be connected.Rest part principle is identical as Fig. 2.

Fourth aspect exporting flash driving circuit the present invention provides a kind of from pump pressure overcurrent protective N pipes.

Embodiment 5

A kind of circuit block diagram such as Fig. 9 institutes from pump pressure overcurrent protective N pipes output flash driving circuit of fourth aspect Show：It is a kind of to export flash driving circuit from pump pressure overcurrent protective N pipes, including：Switch control unit (1), switch unit (2), It is pumped energy-storage units (3), on off state identification and feedback unit (4), load voltage recognition unit (5), energy storage delay unit (6) and reset unit (7), wherein：

Switch unit has positive terminal, input terminal and output end,

Energy storage delay unit has input, output end and third end,

Reset unit has input terminal, common end and output end；

The common end grounding of reset unit, the input terminal of the output end connecting valve control unit of reset unit；

Figure 10 is a kind of overcurrent protective N pipes of pump pressure certainly output flash driving that embodiment of the present invention fourth aspect provides Circuit structural schematic diagram, it is a kind of to export flash driving circuit from pump pressure overcurrent protective N pipes, including：

Reset unit includes triode Q6, Q7 and resistance R8, the input terminal of the base stage of triode Q7 as reset unit, and three The common end that the emitter of pole pipe Q6 is connected with the emitter of Q7 as reset unit, the collector of triode Q6 is as multiple The collector of the output end of bit location, triode Q6 connects with the base stage of triode Q7 and by resistance R8 connection positive pole；

The common end grounding of reset unit, the input terminal of the output end connecting valve control unit of reset unit.

The difference of the circuit and Fig. 2 circuits is：Also by reset unit from the emitter circuit reconfiguration of Q1 to base loop, figure 2 be the time-delay reset of " tandem " to be carried out from the emitter of Q1, and Fig. 8 is answered from the delay of the base stage of Q1 progress " parallel " Position.When power tube Q2 normallies, triode Q3 cut-offs.When VO terminals have output voltage, Q5 and Q4 conductings, as C2 Charging makes triode Q7 conductings, Q6 end further through R7, inputs high-impedance state signal in VIN terminals in the case or passes through For resistance in VIN terminal input low level signals, triode Q1 emitters will not obtain base current, Q1 cut-offs, and Q2 is maintained Conducting.

When power tube overcurrent, Q3 can be connected, and then Q1 be made to be connected, and Q1 conductings make power tube Q2 end to be protected, VO Terminal exports low potential, and Q5, Q4 will end at this time, and C2 starts to discharge, and so that Q7 is connected conducting, Q6 continues cut-off, Q1 continues to lead It is logical, maintain Q2 cut-offs；As capacitance C2 electric discharges terminate, so that Q7 is become, cut-off, Q6 is begun to turn on, Q1 ends, and makes Q2 again from pump Pressure restores conducting, and rest part principle is identical as Fig. 2.

In the above-described embodiments, further energy storage can also be carried out to the pump pressure accumulator, as shown in figure 11, Circuit structure is characterized in that circuit includes diode D4 and capacitance C4, and the anode connection original of diode D4 is pumped energy-storage units Output end, the cathode of diode D4 connect one end of the pump pressure input terminal and capacitance C4 of the switch control unit, capacitance simultaneously The other end of C4 is grounded or connection positive pole, can utilize diode D4 that the pump pressure energy storage in capacitance C1 is further in this way Isolation storage is pumped energy-storage property to improve circuit.

Above-described embodiment 2,3,4,5 all has the technical characterstic of embodiment 1, i.e.,：It is simple in structure, overturning is rapid, member is reduced, It is small, at low cost, highly reliable, can be applied to a variety of DC level driving circuits, low frequency or ultralow frequency driving circuit, Pulse driving circuit, intermittent pulses driving circuit, just there is higher application value.

The above embodiment is only the explanation and illustration for technical solution of the present invention, for depending on core of the present invention to think Conceivable other embodiment or the embodiment of the present invention is spliced, combine obtained by other special-shaped embodiment all fall Enter invention which is intended to be protected, protection scope of the present invention is limited according to appended claims book.

Claims

1. a kind of exporting flash driving circuit from pump pressure overcurrent protective N pipes, it is characterised in that including：Switch control unit (1), Switch unit (2), pump pressure energy-storage units (3), on off state identification and feedback unit (4), load voltage recognition unit (5), storage Energy delay unit (6) and reset unit (7), wherein：

The switch unit has positive terminal, input terminal and output end,

The energy storage delay unit has input, output end and third end,

The reset unit has input terminal, common end and output end；

The positive terminal of the switch unit connects positive pole, and the output end of the switch unit is used to control the electricity of external loading Source anode,

The positive terminal of the pump pressure energy-storage units connects positive pole, and negative pole end connects the switch unit output end, the pump The output end of pressure energy-storage units connects the pump pressure input terminal of the switch control unit,

The positive terminal of the on off state identification and feedback unit connects positive pole, the on off state identification and feedback unit Input terminal connect the output end of the switch unit, opened described in the on off state identification and the output end connection of feedback unit The input terminal of control unit is closed,

The input terminal of the load voltage recognition unit connects the output end of the switch unit, the load voltage recognition unit Ground terminal ground connection, the output end of the load voltage recognition unit connects the input terminal of the energy storage delay unit,

The output end of the third end connection positive pole of the energy storage delay unit or ground connection, the energy storage delay unit connects institute The input terminal of reset unit is stated,

The output end of the common end grounding of the reset unit, the reset unit connects the public of the switch control unit End；

When the input terminal of the switch control unit inputs first voltage, the switch control unit output high potential makes institute Switch unit saturation conduction is stated, the switch unit exports high potential, and load is made to obtain power supply；When in the switch control unit Input terminal input second voltage when, switch control unit output low potential makes the switch unit end, the switch Unit exports low potential, makes load deenergization；In the normal saturation conduction of the switch unit, on off state identification and When feedback unit recognizes the saturation voltage drop of switch unit in the safe allowable range of electric current, the on off state identification and feedback Unit, which exports tertiary voltage and controls switch unit by the switch control unit, maintains the stable state in saturation conduction； When the switch unit overcurrent, the on off state identification and feedback unit recognize switch unit saturation voltage drop and pacify more than electric current When full permissible value, the on off state identification and feedback unit export the 4th voltage and are opened by switch control unit control Unit cut-off cut-out load current is closed, so that the switch unit is protected, and then the load voltage recognition unit is made to identify To the upper no-voltage of load, the load voltage recognition unit, which controls the energy storage delay unit, to be stopped energy storage and exports delay letter Number, the reset unit is maintained the switch unit by the switch control unit and is ended under the action of the time delayed signal State；At the end of the delay of the energy storage delay unit, the energy storage delay unit output reset signal, and by described multiple Bit location and switch control unit make the switch unit reset conducting again, and circuit enters institute if switch unit overcurrent releases The stable state of switch unit saturation conduction is stated, if switch unit still overcurrent, reenters the delay of switch unit cut-off Protection process；If due to when switch unit input terminal control undertension, which causes switch unit to exit saturation, enters amplification region, institute State that switch unit tube voltage drop will trigger on off state identification and feedback unit exports the 4th voltage and controlled by the switch Unit control switch unit cut-off processed, makes the switch unit be protected；End or enter protection shape in the switch unit When state, the switch unit output terminal potential is dragged down by external loading, and then makes the energy storage delay unit energy storage again, multiple When position signal arrives, switch unit restarts to be connected, institute's storing up electricity pressure and the switch unit inside the energy storage delay unit Output voltage Downward addition, realizing from pump pressure makes the pump pressure energy-storage units export enough cut-in voltages, and makes the switch The reliable simultaneously saturation conduction of opening of the N pipes of unit exports high potential.

2. according to claim 1 export flash driving circuit from pump pressure overcurrent protective N pipes, it is characterised in that：

Switch control unit includes one end of the collector connection resistance R1 of triode Q1 and resistance R1, Q1 and as the switch The base stage of the output end of control unit, the pump pressure input terminal of the other end of resistance R1 as switch control unit, triode Q1 is made For the input terminal of switch control unit, the common end of the emitter of triode Q1 as switch control unit,

Switch unit includes transistor Q2, the positive terminal of the drain electrode of transistor Q2 as the switch unit, described in grid conduct The input terminal of switch unit, output end of the source electrode as the switch unit,

On off state identifies and feedback unit includes triode Q3 and resistance R2, R3, is opened described in the emitter conduct of triode Q3 Off status identifies and the positive terminal of feedback unit, the base stage of triode Q3 are connected with the one end resistance R3, resistance R3 other end conducts On off state identifies and the input terminal of feedback unit, the collector of triode Q3 are connected with one end of resistance R2, and resistance R2's is another One end is identified as on off state and the output end of feedback unit,

Load voltage recognition unit includes triode Q4, Q5 and resistance R4, R5, R6, and the base stage of triode Q5 connects resistance R4's One end, the input terminal of the other end of resistance R4 as the load condition recognition unit, the emitter of triode Q5 is as ground connection End, the collector of triode Q5 are connected by the base stage of resistance R5 connecting triodes Q4, the emitter of triode Q4 by resistance R6 Connect positive pole, the output end of the collector of triode Q4 as load voltage recognition unit,

Energy storage delay unit includes resistance R7 and capacitance C2, and one end of the one end resistance R7 and capacitance C2 are connected to the energy storage and prolong The input terminal of Shi Danyuan, the output end of the other end of resistance R7 as energy storage delay unit, the other end of capacitance C2 is as energy storage The third end connection positive pole of delay unit or ground connection,

Reset unit includes triode Q8, the input terminal of the base stage of triode Q8 as reset unit, and emitter is single as resetting The common end of member, output end of the collector as reset unit；

The output end of the common end grounding of the reset unit, the reset unit connects the public of the switch control unit End.

3. a kind of exporting flash driving circuit from pump pressure overcurrent protective N pipes, it is characterised in that including：Switch control unit (1), Switch unit (2), pump pressure energy-storage units (3), on off state identification and feedback unit (4), load voltage recognition unit (5), storage Energy delay unit (6) and reset unit (7), wherein：

The switch unit has positive terminal, input terminal and output end,

The load voltage recognition unit has input terminal and output end,

The energy storage delay unit has input, output end and third end,

The reset unit has input terminal, common end and output end；

The input terminal of the load voltage recognition unit connects the output end of the switch unit, the load voltage recognition unit Output end connect the input terminal of the energy storage delay unit,

When the input terminal of the switch control unit inputs first voltage, the switch control unit output high potential makes institute Switch unit saturation conduction is stated, the switch unit exports high potential, and load is made to obtain power supply；When in the switch control unit Input terminal input second voltage when, switch control unit output low potential makes the switch unit end, the switch Unit exports low potential, makes load deenergization；In the normal saturation conduction of the switch unit, on off state identification and When feedback unit recognizes switch unit saturation voltage drop in the safe allowable range of electric current, the on off state identification and feedback Member output tertiary voltage simultaneously maintains the stable state in saturation conduction by switch control unit control switch unit；Institute When stating switch unit overcurrent, the on off state identification and feedback unit recognize switch unit saturation voltage drop more than electric current safety When permissible value, the on off state identification and feedback unit export the 4th voltage and are controlled by the switch control unit and switched Unit cut-off cut-out load current, makes the switch unit be protected, and then the load voltage recognition unit is made to recognize No-voltage in load, the load voltage recognition unit, which controls the energy storage delay unit, to be stopped energy storage and exports time delayed signal, The reset unit maintains the switch unit cut-off shape by the switch control unit under the action of time delayed signal State；At the end of the delay of the energy storage delay unit, the energy storage delay unit output reset signal, and pass through the reset Unit and switch control unit make the switch unit reset conducting again, if switch unit overcurrent releases described in circuit entrance The stable state of switch unit saturation conduction, if switch unit still overcurrent, the delay for reentering switch unit cut-off is protected Shield process；If described due to when switch unit input terminal control undertension, which causes switch unit to exit saturation, enters amplification region Switch unit tube voltage drop will trigger the on off state identification and feedback unit exports the 4th voltage and controlled by the switch Unit controls switch unit cut-off, and the switch unit is made to be protected；End or enter guard mode in the switch unit When, the switch unit output terminal potential is dragged down by external loading, and then makes the energy storage delay unit energy storage again, is being resetted When signal arrives, switch unit restarts to be connected, and institute's storing up electricity pressure is defeated with the switch unit inside the energy storage delay unit Go out voltage Downward addition, realizing from pump pressure makes the pump pressure energy-storage units export enough cut-in voltages, and keeps the switch single The reliable simultaneously saturation conduction of opening of the N pipes of member exports high potential.

4. according to claim 3 export flash driving circuit from pump pressure overcurrent protective N pipes, it is characterised in that：

Load voltage recognition unit includes diode D3, the input of the anode of diode D3 as the load condition recognition unit End, the output end of the cathode of diode D3 as load voltage recognition unit,

5. a kind of exporting flash driving circuit from pump pressure overcurrent protective N pipes, it is characterised in that including：Switch control unit (1), Switch unit (2), pump pressure energy-storage units (3), on off state identification and feedback unit (4), load voltage recognition unit (5), storage Energy delay unit (6) and reset unit (7), wherein：

The switch unit has positive terminal, input terminal and output end,

The energy storage delay unit has input, output end and third end,

The reset unit has first input end, the second input terminal and output end；

The output end of the switch control unit connects the input terminal of the switch unit, the common end of the switch control unit Ground connection,

The positive terminal of the on off state identification and feedback unit connects positive pole, the on off state identification and feedback unit Input terminal connect the output end of the switch unit, the on off state identification and the output end connection of feedback unit are described multiple Second input terminal of bit location,

The output end of the third end connection positive pole of the energy storage delay unit or ground connection, the energy storage delay unit connects institute The first input end of reset unit is stated,

6. according to claim 5 export flash driving circuit from pump pressure overcurrent protective N pipes, it is characterised in that：

Reset unit includes triode Q9 and Q10, and the collector of triode Q9 is connected with the base stage of Q10, the transmitting of triode Q9 Pole is grounded, and the first input end of the base stage of triode Q9 as reset unit, the emitter of triode Q10 is as reset unit Second input terminal, the output end of the collector of triode Q10 as reset unit；

7. a kind of exporting flash driving circuit from pump pressure overcurrent protective N pipes, it is characterised in that including：Switch control unit (1), Switch unit (2), pump pressure energy-storage units (3), on off state identification and feedback unit (4), load voltage recognition unit (5), storage Energy delay unit (6) and reset unit (7), wherein：

The switch unit has positive terminal, input terminal and output end,

The energy storage delay unit has input, output end and third end,

The reset unit has input terminal, common end and output end；

The common end grounding of the reset unit, the output end of the reset unit connect the input of the switch control unit End；

8. according to claim 7 export flash driving circuit from pump pressure overcurrent protective N pipes, it is characterised in that：

Reset unit includes triode Q6, Q7 and resistance R8, the input terminal of the base stage of triode Q7 as reset unit, triode The common end that the emitter of Q6 is connected with the emitter of Q7 as reset unit, the collector of triode Q6 is as reset unit Output end, the collector of triode Q6 connects with the base stage of triode Q7 and by resistance R8 connection positive pole；

The common end grounding of the reset unit, the output end of the reset unit connect the input of the switch control unit End.

9. wanting 2,4,6,8 any one of them to export flash driving circuit, feature from pump pressure overcurrent protective N pipes according to right It is, further includes that the anode of diode D4 and capacitance C4, the diode D4 connect the output end of the pump pressure energy-storage units, institute It states the cathode of diode D4 while connecting one end of the pump pressure input terminal and capacitance C4 of the switch control unit, the capacitance C4 The other end ground connection or connection positive pole.