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

Timing control circuit of pulse power supply Download PDF

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Publication number
CN103280968A
CN103280968A CN2013101679744A CN201310167974A CN103280968A CN 103280968 A CN103280968 A CN 103280968A CN 2013101679744 A CN2013101679744 A CN 2013101679744A CN 201310167974 A CN201310167974 A CN 201310167974A CN 103280968 A CN103280968 A CN 103280968A
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circuit
converter
connect
anode
power
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CN103280968B (en
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廖建军
尹华
鄢毅之
余海生
李建仁
王健安
崔庆林
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CETC 24 Research Institute
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CETC 24 Research Institute
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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):
12 × R 2 R 1 + R 2 ≥ 1.4 V - - - ( 1 )
17 &times; R 2 R 1 + R 2 - 5 V < 1.4 V - - - ( 2 )
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:
1 2 C 1 ( V D + 0.7 ) 2 = Pout &eta; T - - - ( 3 )
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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CN111708303A (en) * 2020-06-24 2020-09-25 电子科技大学 Time sequence power supply device for providing multi-path variable voltage
CN111983957A (en) * 2020-09-03 2020-11-24 中国兵器工业集团第二一四研究所苏州研发中心 Combined power supply and power-on time sequence control method thereof

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