CN103280968A - Timing control circuit of pulse power supply - Google Patents

Abstract

The invention relates to a timing control circuit of a pulse power supply. The timing control circuit comprises a DC/DC (Direct Current) converter 1, a DC/DC converter 2, a power-on detection circuit, a delay circuit, a power-down detection circuit, switching current and a drive circuit. The power-on timing problems of GaAs devices and the like are solved by fewer components. The power-down timing circuit solves the damage problems of the GaAs devices and the like caused by timing abnormity due to output power-down. The power-down timing circuit is combined with the delay circuit, so that the output overcurrent or short-circuit protection problems of positive voltage are simultaneously solved. The timing control circuit provided by the invention can be widely applied to electronic circuits which need to meet positive and negative power supply timing in the fields of communications, radar, aviation, electronic countermeasure and the like.

Description

The sequential control circuit of the pulse power

Technical field

The present invention relates to a kind of sequential control circuit, particularly a kind of sequential control circuit of the pulse power, it directly should need to satisfy the electronic circuit of positive and negative power supply timing in fields such as communication, radar, aviation, electronic countermeasures.

Background technology

Along with the development of radio-frequency technique, use pulse output voltage to power as radio circuit usually.Radio-frequency devices is had higher requirement to the switching on and shutting down sequential of Switching Power Supply: a large amount of use GaAs field effect transistors in the radio circuit, and by the modulation of GaAs field effect transistor drain voltage being finished the transmission of signal.GaAs field effect transistor belongs to exhausting property device, and when its grid voltage was 0V, this device also was in complete conducting state.Therefore, when powering for GaAs device, require the grid negative voltage to exist prior to the drain electrode positive voltage all the time.If the drain electrode positive voltage exists prior to the grid negative voltage, will in device, produce destructive electric current, device is produced damage, influence the long-term reliability of device.Therefore, when being designed to the power supply of GaAs and so on device power supply, negative voltage will start earlier, treat negative voltage set up finish after, positive voltage could start; Equally, in input power cut-off process, if negative voltage turn-offs prior to positive voltage, be stored in then that the energy on the capacitive device also may cause GaAs field effect transistor to occur losing efficacy in the circuit.Therefore, in the power cut-off process, negative voltage will back outage, namely need all positive voltages all to cut off the power supply after, negative voltage could cut off the power supply.In a word, in needing the GaAs field effect transistor circuit of generating positive and negative voltage power supply, the sequential of the machine open/close of power supply there is strict requirement.

Sequential control circuit commonly used, as shown in Figure 1.This circuit need detect the circuit that powers on earlier, after treating the delay circuit time-delay, open the switching tube of the circuit that powers on after needing, to reach the control of electrifying timing sequence, delay circuit wherein is resistance, electric capacity only, does not have adjustable comparison threshold, at needs than long delay during the time, the resistance, the electric capacity that need are bigger, are unfavorable for circuit debugging.

Patent documentation 1 " power supply sequencing control circuit " (ZL03207474.3), as shown in Figure 2.This circuit is a kind of electrifying timing sequence control circuit of two-way out-put supply.The sequential time delay circuit that this patent proposes adopts comparator that the two-way power supply that needs postpone output is carried out sampling rate, and the output of comparator is used for driving the switching tube that needs to postpone output voltage.The scheme that this patent proposes, the sequential requirement in the time of can satisfying power supply electrifying.But, 1) owing to adopted comparator, need power to comparator, especially two output voltage all when low, also needs extra power supply circuits, has increased the complexity of circuit; 2) this circuit can not satisfy the requirement of shutoff sequential, when adopting this circuit design to satisfy the GaAs field effect transistor power supply, and the sequential requirement in the time of can't satisfying the input power supply power-fail.

Summary of the invention

For overcoming the sequence circuit electrifying timing sequence control complexity of above-mentioned traditional pulse power, and there is not the not enough problem of power-off sequential control, the present invention proposes a kind of sequential control circuit of the pulse power, solve the power supply timing problem that need satisfy positive and negative power supply timing circuit well, in this circuit application during in GaAs device, realize electrifying timing sequence control and the power-off sequential control of grid and drain voltage, and circuit is succinct, easy to use.

For achieving the above object, the sequential control circuit of a kind of pulse power of the present invention comprises:

A DC/DC converter 1 is converted to the needed positive voltage of load with input supply voltage;

A DC/DC converter 2, the positive voltage that described DC/DC converter 1 is exported is converted to the needed negative voltage of load;

Go up power detection circuit for one, when the start of input power supply, the positive voltage of described DC/DC converter 1 output and the negative voltage of described DC/DC converter 2 outputs are detected simultaneously;

A power-fail detection circuit, when the shutdown of input power supply, the positive voltage that described DC/DC converter 1 is exported detects;

A delay circuit plays delayed action to the opening time of switching circuit;

A switching circuit is with positive voltage and the load isolation of DC/DC converter 1 output, by conducting and the shutoff of switching circuit, with the output supply load of described DC/DC converter 1;

A drive circuit is used for the driving switch circuit;

Wherein, 1 end and the input of DC/DC converter 1 are joined, 2 ends of DC/ DC converter 1 and 1 end of DC/ DC converter 2,1 end of last power detection circuit, 1 end of power-fail detection circuit and 1 end of switching circuit link to each other, 2 ends of DC/ DC converter 2 and 2 ends of last power detection circuit join, and join with output loading, be the negative output terminal of the sequential control circuit of the whole pulse power, 3 ends of last power detection circuit, 2 ends of power-fail detection circuit, 1 end of delay circuit links together, 2 ends of delay circuit and 1 end of drive circuit join, 2 ends of drive circuit and 2 ends of switching circuit join, 3 ends and the output loading of switching circuit are joined, and are the positive output end of the sequential control circuit of the whole pulse power.

Described DC/DC converter 1 comprises transformer X ₁, diode D ₁, D ₂, inductance L ₁, capacitor C ₁, wherein, X ₁End A elementary of the same name connect positive input, X ₁Elementary different name end B connect negative input, X ₁End C secondary of the same name meet D ₁Anode, X ₁Secondary different name end D connect output ground, D ₂Anode, capacitor C ₁Negative terminal all connect output ground, D ₁Negative electrode, D ₂Negative electrode and inductance L ₁1 end link together L ₁2 termination C ₁Anode, described DC/DC converter 1 is the converter of forward converter structure, also can be anti-swash or recommend or half-bridge or full-bridge and adopt the circuit structure of diode rectification.

Described DC/DC converter 2 comprises diode D ₃, capacitor C ₂, capacitor C ₃, controller IC ₁, inductance L ₂, metal-oxide-semiconductor V ₉, metal-oxide-semiconductor V ₁₀, wherein, D ₃Anode meet C ₁Anode, D ₃Negative electrode and IC ₁V _INEnd, V ₁₀Drain electrode, C ₂Anode link together V ₁₀Source electrode and V ₉Drain electrode, inductance L ₂1 end link together C ₃Anode and L ₂2 ends all connect output ground, V ₉Grid and IC ₁L _DRVEnd connects, V ₁₀Grid and IC ₁H _DRVEnd connects, IC ₁P _GNDEnd, V ₉Source electrode, capacitor C ₂Negative terminal, C ₃Negative terminal all connect negative output.

The described power detection circuit of going up comprises resistance R ₁, resistance R ₂, diode D ₄, triode V ₁, wherein, R ₁1 end and C ₁Anode connect R ₂2 ends be connected R with negative output ₁2 ends, R ₂1 end all and D ₄Anode connect D ₄Negative electrode and V ₁Base stage connect V ₁Collector electrode and the capacitor C in the described delay circuit ₄Anode connect V ₁Emitter be connected with output ground.

Described delay circuit comprises resistance R ₃, capacitor C ₄, voltage-stabiliser tube D ₆, switching tube V ₈, wherein, R ₃1 end and C ₁Anode connect R ₃2 ends and C ₄Anode connect C ₄Negative terminal connect output ground, D ₆Negative electrode and C ₄Anode connect D ₆Anode and V ₈Grid link to each other V ₈Source electrode connect output ground, V ₈Drain electrode and the switching tube V in the described drive circuit ₇Source electrode link to each other.

Described power-fail detection circuit comprises resistance R ₄, resistance R ₅, resistance R ₆, resistance R ₇, voltage-stabiliser tube D ₅, switching tube V ₂, switching tube V ₃, wherein, V ₂Emitter, V ₃Emitter, R ₅2 ends, R ₇2 ends all connect output ground, D ₅Negative electrode and C ₁Anode connect D ₅Anode and R ₆1 end connect R ₆2 ends and R ₇1 end and V ₃Base stage link to each other resistance R ₄2 ends and R ₅1 end connect R ₄1 end and C ₁Anode connect R ₄2 ends and V ₃Collector electrode and V ₂Base stage link to each other V ₂Collector electrode and C ₄Anode connect described switching tube V ₂, switching tube V ₃Be NPN type triode.

Described drive circuit comprises resistance R ₁₁, resistance R ₁₂, resistance R ₁₃, resistance R ₁₆, resistance R ₁₇, switching tube V ₇, driver IC ₂, wherein, IC ₂V _CCEnd, R ₁₁1 end, R ₁₂1 end, R ₁₆1 end all and C ₁Anode link together R ₁₁2 ends and IC ₂E _NAEnd connects, R ₁₂2 ends and IC ₂E _NBEnd links to each other, R ₁₆2 ends and V ₇Drain electrode links to each other, V ₇Drain electrode and IC ₂Input I _NAAnd I _NBLink to each other R ₁₇1 end and outside input TTL signal link to each other R ₁₇2 ends and V ₇Grid link to each other V ₇Source electrode and V ₈Drain electrode link to each other R ₁₃1 end and IC ₂O _UTAAnd O _UTBLink to each other R ₁₃2 ends and the switching tube V in the described switching circuit ₄, V ₅Grid link to each other.

Described switching circuit is by resistance R ₈, switching tube V ₄, switching tube V ₅Constitute, wherein, R ₈1 end and C ₁Anode connect V ₄Source electrode and C ₁Anode connect V ₄Grid, V ₅Grid interconnect after, with R ₈2 ends link together V ₄Drain electrode and V ₅Drain electrode connect V ₅Source electrode be connected described switching tube V with output ground ₄Be P type metal-oxide-semiconductor, described switching tube V ₅Be the N-type metal-oxide-semiconductor.

Beneficial effect

The sequential control circuit of the pulse power of the present invention has mainly solved the power supply timing problem that need satisfy positive and negative power supply timing circuit: when the start of input power supply, negative voltage powers on earlier with respect to positive voltage; In input power supply when shutdown, negative voltage with respect to positive voltage after power down.Compare with traditional sequential control circuit, the sequential control circuit of the pulse power of the present invention has following characteristics:

1) circuit of the present invention adopts less components and parts to realize the electrifying timing sequence function.Traditional sequential control circuit solves electrifying timing sequence, need to adopt circuit such as comparator, by two-way voltage relatively controlled the electrifying timing sequence requirement, the components and parts that adopt are many, and electrifying timing sequence control circuit of the present invention, only adopted 2 resistance can realize detection to voltage, so circuit of the present invention is succinct, easy to use.

2) circuit of the present invention has solved the problem of power-off sequential.In traditional sequential control circuit, only the electrifying timing sequence problem can be solved, the power-off sequential problem of GaAs class device power supply can not be solved when the shutdown of input power supply.The present invention utilizes the energy storage function of the output filter capacitor of DC/DC converter 1, when the shutdown of input power supply, the energy that is stored in the electric capacity is offered the negative voltage use, satisfy negative voltage with respect to positive voltage after the requirement of power down, therefore circuit of the present invention causes the problem of device failure unusually in the time of can avoiding being applied to the shutdown of GaAs class device, because of power-off sequential; And because the not extra energy storage capacitor that increases of circuit of the present invention can significantly reduce the circuit volume more than 10%.

3) the invention solves overcurrent and the short-circuit protection problem of positive voltage.Power-fail detection circuit and the delay circuit of circuit of the present invention are combined, can also solve overcurrent and the short-circuit protection problem of DC/DC converter 1 output positive voltage.

Description of drawings

Fig. 1 is the circuit diagram of the sequential control circuit of routine;

Fig. 2 is the circuit diagram of the sequential control circuit of patent documentation 1;

Fig. 3 is the structured flowchart of the sequential control circuit of the pulse power of the present invention;

Fig. 4 is the sequential control circuit specific implementation circuit diagram of the pulse power of the present invention;

Fig. 5 is used for the realization circuit diagram of overcurrent and short-circuit protection for the present invention;

Fig. 6 is the electrifying timing sequence figure of the sequential control circuit of the pulse power of the present invention;

Fig. 7 is the power-off sequential figure of the sequential control circuit of the pulse power of the present invention;

Fig. 8 is the sequential chart of pulse power positive voltage output overcurrent of the present invention and short-circuit protection.

Embodiment

The specific embodiment of the present invention is not limited only to following description, is now further specified by reference to the accompanying drawings.

The structured flowchart of the sequential control circuit of the pulse power of the present invention as shown in Figure 3, the circuit diagram of the sequential control circuit of the pulse power of the present invention as shown in Figure 4, it is made up of DC/DC converter 1, DC/DC converter 2, last power detection circuit, delay circuit, power-fail detection circuit, switching current and drive circuit, its concrete structure and annexation, interactively are identical with the summary of the invention part of this specification, no longer repeat herein.Its operation principle is as follows:

Among Fig. 4, when the start of input power supply: DC/DC converter 1 is started working, and its output voltage begins slowly to rise to from 0V+12V output.

When the output of DC/DC converter 1 during less than the starting resistor of DC/DC converter 2+4.5V, DC/DC converter 2 is not worked, and its output voltage is 0V.At this moment, R ₁, R ₂Through after the dividing potential drop, make V ₁Conducting stops R ₃To C ₄Charging, D ₄Effect be to improve V ₁Conducting voltage, at this moment, capacitor C ₄On do not have voltage.

When the output resume of DC/DC converter 1 rises to the starting resistor 4.5V of DC/DC converter 2, DC/DC converter 2 will be started working, and its output voltage will slowly drop to from 0V-5V, at this moment R ₁, R ₂Common point voltage will reduce along with the decline of DC/DC converter 2 output voltages, finally when-when 5V sets up, its common point voltage with deficiency so that V ₁Conducting.R ₁And R ₂Value select based on 2 points: the one ,-before 5V does not start, require R ₁And R ₂The branch pressure voltage that constitutes will make V ₁Conducting; The 2nd, when-5V start finish after, require R ₁And R ₂The branch pressure voltage that constitutes will make V ₁Turn-off, namely will satisfy formula (1) and (2):

$\frac{12\&times;R_2}{{\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="HDA00003162881300021.png"\; state="\{\{state\}\}">R</figure-callout>}}_1+{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="HDA00003162881300021.png"\; state="\{\{state\}\}">R</figure-callout>}}_2}\&GreaterEqual;1.4V---\left(1\right)$

$\frac{17\&times;R_2}{{\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="HDA00003162881300021.png"\; state="\{\{state\}\}">R</figure-callout>}}_1+R_2}-5V<1.4V---\left(2\right)$

Wherein 1.4V is diode D ₄With triode V ₁BE knot pressure drop sum.

After the output-5V voltage of DC/DC converter 2 is set up, triode V ₁To no longer control lag circuit, if but the output of DC/DC converter 1 is not enough to puncture voltage stabilizing didoe D ₅Make triode V ₃During conducting, triode V ₂With conducting and control lag circuit, stop resistance R ₃To capacitor C ₄Charging can make C equally ₄On do not have voltage.

Work as capacitor C ₄On when not having voltage, switching tube V ₈Turn-off, drive circuit does not respond the TTL signal of input, and drive circuit is exported high level all the time, and switching circuit turn-offs, and the output+12V of DC/DC converter 1 can not be delivered to supported V ₆On.

When the output of DC/DC converter 2 reaches-5V, and the output voltage of DC/DC converter 1 can puncture voltage stabilizing didoe D ₅Make triode V ₃During conducting, triode V ₂Turn-off.Delay circuit is started working.Resistance R ₃To capacitor C ₄Begin charging, C ₄On voltage continue to raise, when its voltage can puncture voltage stabilizing didoe D ₆And make switching tube V ₈During conducting, drive circuit can be to input TTL signal response, and according to the TTL signal condition, makes the quick conducting of switching circuit and shutoff, and the output voltage of DC/DC converter 1 is offered supported V ₆Use.

Above process has realized the electrifying timing sequence requirement: when namely importing the power supply start, negative voltage uses prior to the positive voltage supply load.The length of time of delay can be by regulating resistance R ₃, capacitor C ₄, voltage stabilizing didoe D ₅And D ₆Value realize.

In Fig. 4, input power supply continued power, the circuit normal work period: switching circuit is activated the control of circuit, with DC/DC converter 1+12V output offers load and uses.If at work sometime, overcurrent or short-circuit condition have appearred in load, because DC/DC converter 1 can't provide enough energy.The output voltage of DC/DC converter 1 will begin to descend.When its undertension to allow voltage-stabiliser tube D ₅During conducting, triode V ₃Turn-off V ₂Conducting, capacitor C ₄Discharge.Work as capacitor C ₄After the discharge, voltage-stabiliser tube D ₆No longer breakdown, metal-oxide-semiconductor V ₈Turn-off.Driver IC ₂Input TTL signal is not responded, and its output will remain high level, switching circuit V ₄Turn-off, with DC/DC converter 1+12V output and load overcurrent and short-circuit condition keep apart.

When DC/DC converter 1+after 12V output was kept apart with load overcurrent or short-circuit condition, its output voltage began rising.When voltage rises to can be with voltage-stabiliser tube D ₅Puncture and make triode V ₃During conducting, V ₂Turn-off.Delay circuit restarts work, by resistance R ₃To capacitor C ₄Charge.Work as C ₄Charging voltage puncture voltage-stabiliser tube D ₆, and with metal-oxide-semiconductor V ₈During conducting, driver IC ₂Again input TTL signal is begun response, and according to the TTL signal condition, control switch pipe V ₄Conducting and shutoff.DC/DC converter 1 begins to be back level load power supply again.

When back level load overcurrent or short-circuit condition are not eliminated, switching tube V ₄Will repeat to turn-off and conducting.Its time interval will be determined by delay circuit; When back level load overcurrent or short-circuit condition elimination, circuit recovers operate as normal.

The above course of work has been guaranteed 1 output of DC/DC converter in the time of overcurrent and short circuit, and circuit is in the protection of having the hiccups.

In Fig. 4, when the shutdown of input power supply: DC/DC converter 1 quits work because the input noenergy provides, and its output filter capacitor C ₁On can have lot of energy.The input of DC/DC converter 2 is by diode D ₃Be connected on the output of DC/DC converter 1.After the input power down, DC/DC converter 2 will also can be worked a period of time, because 2 employings of DC/DC converter is the Buck-boost structure, the ground of its controller is connected on-5V on, therefore, even when DC/DC converter 1 is output as 0V, DC/DC converter 2 still can work on.

Because the input noenergy provides C ₁Electric capacity begins power down.Work as C ₁Voltage be reduced to voltage-stabiliser tube D ₅Breakdown value when following, triode V ₃Turn-off V ₂Conducting, capacitor C ₄Discharge, final switching tube V ₈Turn-off.As switching tube V ₈During shutoff, the TTL signal can not enter drive IC ₂, driver IC ₂Output is always high level, with the V in the switching circuit ₄Turn-off V ₅Conducting.Be stored in capacitor C this moment ₁On energy will be use offering the positive voltage load, use and all offer DC/DC converter 2, in order to continue to keep-5V voltage.After the input power down, the time T that-5V can keep by formula (3) is calculated:

$\frac{1}{2}{C}_1{(V_D+0.7)}^2=\frac{\mathrm{Pout}}{\mathrm{\&eta;}}T---\left(3\right)$

V wherein _DBe voltage-stabiliser tube D ₅Puncture voltage, 0.7 is triode V ₃The BE junction voltage, η is the efficient of DC/DC converter 2, Pout is-power output of 5V.

Above process has realized the power-off sequential requirement: when namely importing the power supply shutdown, turn-off in positive voltage behind the negative voltage that supply load uses.

Fig. 6 is the electrifying timing sequence control chart of the sequential control circuit of the pulse power of the present invention.At t _o-t ₁Time period: when input powered on ,+12V output voltage continued to rise, because this moment-5V voltage does not start, Vsence voltage is high level, stoped the delay circuit charging, switching tube V ₄Not conducting ,+12vout is output not; At t ₁-t ₂Time period :-5V does not start, and Vsence is high level, continues to stop the delay circuit charging, drive circuit output high level, switching tube V ₄Not conducting ,+12vout is output not; At t ₂-t ₃Time period :-5V begins to start, and Vsence voltage is dragged down, and no longer stops delay circuit to charge; At t ₃-t ₄Time period: delay circuit begins charging; t ₄After time, switching tube V ₄Conducting ,+12vout begins that output is arranged.Therefore, can get from Fig. 6, whole power up has guaranteed that negative voltage is (5V) prior to the positive voltage (+requirement that 12vout) powers on.

Fig. 7 is the power-off sequential control chart of the sequential control circuit of the pulse power of the present invention.At t ₀-t ₁Time period: the circuit operate as normal, negative voltage-5V and+12vout all exists; t ₁-t ₂Time period: at t ₁Constantly, input power supply power-fail, capacitor C ₁On energy can not continue to keep output loading, its voltage begins to descend.Voltage on electric capacity is reduced to voltage-stabiliser tube D ₅Breakdown value and triode V ₃BE junction voltage sum the time, triode V ₃Turn-off V ₂Conducting, capacitor C ₄Discharge, switching tube V ₄Turn-off ,+12vout turn-offs, and at this moment ,-5V voltage still exists; t ₂-t ₃Time period, capacitor C ₁On energy continue to offer-5V uses, and guaranteed the time of delay of negative voltage.t ₃-t ₄Time period, C ₁On energy shortage keep-5V continuing, negative voltage begins to turn-off.Therefore, can get from Fig. 7, whole power down process, (5V) back is in the positive voltage (+12vout) requirement of power down to have guaranteed negative voltage.

Fig. 8 is the sequential chart of pulse power positive voltage output overcurrent of the present invention and short-circuit protection.At t ₀-t ₁Time period, negative voltage begins to start, and delay circuit begins charging, V ₄Switching tube is conducting not, and+12vout is output not; At t ₁-t ₂Time period, switching tube V ₄Conducting, because output exists overcurrent or short trouble, DC/DC converter 1 can not provide enough energy to keep the stable of output voltage, output voltage begins to descend; At t ₂-t ₃Time period, output voltage triggers power-fail detection circuit, capacitor C ₄Discharge, V ₄Turn-off ,+12vout is output not; At t ₃-t ₄Time period, repeat t _o-t ₁Process.Therefore, can get t from Fig. 8 ₀-t ₄Process, realized the protection of having the hiccups of overcurrent and short-circuit condition, can shield to circuit.

Fig. 5 is the another kind of implementation of realization circuit diagram that the present invention is used for overcurrent and short-circuit protection.+ when overcurrent or short circuit appear in the 12vout branch road since DC/DC converter 1 can not provide enough power keep+output of 12vout is stable, capacitor C ₁On voltage will descend.Work as capacitor C ₁On voltage be reduced to voltage-stabiliser tube D ₅With triode V ₃BE junction voltage sum the time, triode V ₃To turn-off V ₂Conducting, capacitor C ₄Begin discharge.At this moment, triode V ₁₁Turn-off, PMOS manages V ₄Turn-off.

Work as V ₄Have no progeny in the pass, overcurrent or short trouble will be by V ₄Blocking-up.+ 12V branch road output voltage recover to rise, when+12V branch road output voltage rises to voltage-stabiliser tube D ₅With triode V ₃BE junction voltage sum the time, triode V ₃Conducting, V ₂Turn-off.At this moment, delay circuit restarts work, through after certain time of delay, and turn-on transistor V again ₁₁With PMOS pipe V ₄

PMOS manages V ₄Again after the conducting, if this moment overcurrent and short trouble do not have circuit operate as normal then.If this moment, fault still existed, then circuit will trigger power-fail detection circuit again, turn-offs V ₄, and through after certain time of delay, conducting PMOS manages V again ₄The protection of having the hiccups when this process will realize overcurrent and short circuit can improve the reliability of circuit.

The basic parameter of circuit of the present invention is:

Triode V ₁, V ₂, V ₃, V ₁₁: FMMT491TA;

Voltage-stabiliser tube D ₅, D ₆: BZX84C5V1;

DC/DC converter 1: input voltage 18V～36V, output voltage+12V;

DC/DC converter 2: output voltage-5V, IC ₁: TPS40077;

In the last power detection circuit, R ₁: 12k Ω, R ₂: 3.9k Ω, D ₄: 1N4148;

In the delay circuit, R ₃: 30k Ω, C ₄: 2.2 μ F, V ₈: 2N7002E;

In the power-fail detection circuit, R ₄, R ₅, R ₆, R ₇, R ₁₉: 10k Ω;

In the drive circuit, IC ₂: UCC27424DGN, V ₇: 2N7002E;

In the switching circuit, V ₄: SI7135DP, V ₅: SI7322DN, R ₈: 10k Ω.

Claims (8)

1. the sequential control circuit of a pulse power is characterized in that it comprises:

A DC/DC converter 1 is converted to the needed positive voltage of load with input supply voltage;

A DC/DC converter 2, the positive voltage that described DC/DC converter 1 is exported is converted to the needed negative voltage of load;

Go up power detection circuit for one, when the start of input power supply, the positive voltage of described DC/DC converter 1 output and the negative voltage of described DC/DC converter 2 outputs are detected simultaneously;

A power-fail detection circuit, when the shutdown of input power supply, the positive voltage that described DC/DC converter 1 is exported detects;

A delay circuit plays delayed action to the opening time of switching circuit;

A switching circuit is with positive voltage and the load isolation of DC/DC converter 1 output, by conducting and the shutoff of switching circuit, with the output supply load of described DC/DC converter 1;

A drive circuit is used for the driving switch circuit;

Wherein, 1 end and the input of DC/DC converter 1 are joined, 2 ends of DC/DC converter 1 and 1 end of DC/DC converter 2,1 end of last power detection circuit, 1 end of power-fail detection circuit and 1 end of switching circuit link to each other, 2 ends of DC/DC converter 2 and 2 ends of last power detection circuit join, and join with output loading, be the negative output terminal of the sequential control circuit of the whole pulse power, 3 ends of last power detection circuit, 2 ends of power-fail detection circuit, 1 end of delay circuit links together, 2 ends of delay circuit and 1 end of drive circuit join, 2 ends of drive circuit and 2 ends of switching circuit join, 3 ends and the output loading of switching circuit are joined, and are the positive output end of the sequential control circuit of the whole pulse power.

2. the sequential control circuit of the pulse power according to claim 1 is characterized in that, described DC/DC converter 1 comprises transformer X ₁, diode D ₁, D ₂, inductance L ₁, capacitor C ₁, wherein, X ₁End A elementary of the same name connect positive input, X ₁Elementary different name end B connect negative input, X ₁End C secondary of the same name meet D ₁Anode, X ₁Secondary different name end D connect output ground, D ₂Anode, capacitor C ₁Negative terminal all connect output ground, D ₁Negative electrode, D ₂Negative electrode and inductance L ₁1 end link together L ₁2 termination C ₁Anode, described DC/DC converter 1 is the converter of forward converter structure, also can be anti-swash or recommend or half-bridge or full-bridge and adopt the circuit structure of diode rectification.

3. the sequential control circuit of the pulse power according to claim 1 is characterized in that, described DC/DC converter 2 comprises diode D ₃, capacitor C ₂, capacitor C ₃, controller IC ₁, inductance L ₂, metal-oxide-semiconductor V ₉, metal-oxide-semiconductor V ₁₀, wherein, D ₃Anode meet C ₁Anode, D ₃Negative electrode and IC ₁V _INEnd, V ₁₀Drain electrode, C ₂Anode link together V ₁₀Source electrode and V ₉Drain electrode, inductance L ₂1 end link together C ₃Anode and L ₂2 ends all connect output ground, V ₉Grid and IC ₁L _DRVEnd connects, V ₁₀Grid and IC ₁H _DRVEnd connects, IC ₁P _GNDEnd, V ₉Source electrode, capacitor C ₂Negative terminal, C ₃Negative terminal all connect negative output.

4. the sequential control circuit of the pulse power according to claim 1 is characterized in that, the described power detection circuit of going up comprises resistance R ₁, resistance R ₂, diode D ₄, triode V ₁, wherein, R ₁1 end and C ₁Anode connect R ₂2 ends be connected R with negative output ₁2 ends, R ₂1 end all and D ₄Anode connect D ₄Negative electrode and V ₁Base stage connect V ₁Collector electrode and the capacitor C in the described delay circuit ₄Anode connect V ₁Emitter be connected with output ground.

5. the sequential control circuit of the pulse power according to claim 1 is characterized in that, described delay circuit comprises resistance R ₃, capacitor C ₄, voltage-stabiliser tube D ₆, switching tube V ₈, wherein, R ₃1 end and C ₁Anode connect R ₃2 ends and C ₄Anode connect C ₄Negative terminal connect output ground, D ₆Negative electrode and C ₄Anode connect D ₆Anode and V ₈Grid link to each other V ₈Source electrode connect output ground, V ₈Drain electrode and the switching tube V in the described drive circuit ₇Source electrode link to each other.

6. the sequential control circuit of the pulse power according to claim 1 is characterized in that, described power-fail detection circuit comprises resistance R ₄, resistance R ₅, resistance R ₆, resistance R ₇, voltage-stabiliser tube D ₅, switching tube V ₂, switching tube V ₃, wherein, V ₂Emitter, V ₃Emitter, R ₅2 ends, R ₇2 ends all connect output ground, D ₅Negative electrode and C ₁Anode connect D ₅Anode and R ₆1 end connect R ₆2 ends and R ₇1 end and V ₃Base stage link to each other resistance R ₄2 ends and R ₅1 end connect R ₄1 end and C ₁Anode connect R ₄2 ends and V ₃Collector electrode and V ₂Base stage link to each other V ₂Collector electrode and C ₄Anode connect described switching tube V ₂, switching tube V ₃Be NPN type triode.

7. the sequential control circuit of the pulse power according to claim 1 is characterized in that, described drive circuit comprises resistance R ₁₁, resistance R ₁₂, resistance R ₁₃, resistance R ₁₆, resistance R ₁₇, switching tube V ₇, driver IC ₂, wherein, IC ₂V _CCEnd, R ₁₁1 end, R ₁₂1 end, R ₁₆1 end all and C ₁Anode link together R ₁₁2 ends and IC ₂E _NAEnd connects, R ₁₂2 ends and IC ₂E _NBEnd links to each other, R ₁₆2 ends and V ₇Drain electrode links to each other, V ₇Drain electrode and IC ₂Input I _NAAnd I _NBLink to each other R ₁₇1 end and outside input TTL signal link to each other R ₁₇2 ends and V ₇Grid link to each other V ₇Source electrode and V ₈Drain electrode link to each other R ₁₃1 end and IC ₂O _UTAAnd O _UTBLink to each other R ₁₃2 ends and the switching tube V in the described switching circuit ₄, V ₅Grid link to each other.

8. the sequential control circuit of the pulse power according to claim 1 is characterized in that, described switching circuit is by resistance R ₈, switching tube V ₄, switching tube V ₅Constitute, wherein, R ₈1 end and C ₁Anode connect V ₄Source electrode and C ₁Anode connect V ₄Grid, V ₅Grid interconnect after, with R ₈2 ends link together V ₄Drain electrode and V ₅Drain electrode connect V ₅Source electrode be connected described switching tube V with output ground ₄Be P type metal-oxide-semiconductor, described switching tube V ₅Be the N-type metal-oxide-semiconductor.

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