CN103280968B - The sequential control circuit of the pulse power - Google Patents

The sequential control circuit of the pulse power Download PDF

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Publication number
CN103280968B
CN103280968B CN201310167974.4A CN201310167974A CN103280968B CN 103280968 B CN103280968 B CN 103280968B CN 201310167974 A CN201310167974 A CN 201310167974A CN 103280968 B CN103280968 B CN 103280968B
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circuit
connect
power
converter
anode
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CN103280968A (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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    • 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 present invention relates to a kind of sequential control circuit of the pulse power, comprise DC/DC converter 1, DC/DC converter 2, power on detection circuit, delay circuit, power-fail detection circuit, switching current and drive circuit.The present invention adopts less device to solve the electrifying timing sequence problem of GaAs class device; Power-off sequential circuit of the present invention, solves because exporting the abnormal problem causing GaAs device to damage of power-off sequential; The combination of power-off sequential of the present invention and delay circuit, also solves output overcurrent or the short-circuit protection problem of positive voltage simultaneously.The present invention can be widely used in the electronic circuit of the positive and negative power supply timing of demand fulfillment in the fields such as communication, radar, aviation, electronic countermeasures.

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 in the fields such as communication, radar, aviation, electronic countermeasures the electronic circuit of the positive and negative power supply timing of demand fulfillment.
Background technology
Along with the development of radio-frequency technique, pulse output voltage is usually used to power for radio circuit.The switching on and shutting down sequential of radio-frequency devices to Switching Power Supply is had higher requirement: use GaAs field effect transistor in a large number in radio circuit, and by the transmission to the modulation settling signal of GaAs field effect transistor drain voltage.GaAs field effect transistor belongs to exhaustive device, and when its grid voltage is 0V, this device is also in complete conducting state.Therefore, for GaAs device power time, require grid negative voltage will all the time prior to drain electrode positive voltage exist.If drain electrode positive voltage exists prior to grid negative voltage, destructive electric current will be produced in the devices, damage be produced to device, affects the long-term reliability of device.Therefore, when being designed to the power supply that GaAs and so on device is powered, negative voltage will first start, and after negative voltage has been set up, positive voltage could start; Equally, in input power power process, if negative voltage turns off prior to positive voltage, then the energy stored on capacitive device in circuit also may cause GaAs field effect transistor to occur losing efficacy.Therefore, in power cut-off process, negative voltage wants rear power-off, and after namely needing the equal power-off of all positive voltages complete, negative voltage could power-off.In a word, in the GaAs field effect transistor circuit of powering needing generating positive and negative voltage, strict requirement is had to the sequential of the machine open/close of power supply.
Conventional sequential control circuit, as shown in Figure 1.This circuit needs to detect first electrification circuit, after circuit delay to be delayed, open the switching tube of electrification circuit after needing, to reach the control of electrifying timing sequence, delay circuit is wherein only resistance, electric capacity, does not have adjustable comparison threshold, needs comparatively high delay time time, the resistance needed, electric capacity are comparatively large, 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 power-on time sequence control circuit of two-way out-put supply.The sequential time delay circuit that this patent proposes adopts comparator to carry out sampling rate comparatively to needing the two-way power supply postponing to export, and the output of comparator is for driving the switching tube needing to postpone output voltage.The scheme that this patent proposes, can meet timing requirements during power supply electrifying.But, 1) owing to have employed comparator, need to power to comparator, when especially two output voltage is all lower, also need extra power supply circuits, add the complexity of circuit; 2) this circuit can not meet shutoff timing requirements, adopts this circuit to design to meet GaAs field effect transistor when powering, and cannot meet timing requirements during input power power down.
Summary of the invention
For the sequence circuit electrifying timing sequence overcoming above-mentioned traditional pulse power supply controls complicated, and control not enough problem without power-off sequential, the present invention proposes a kind of sequential control circuit of the pulse power, solve the power supply timing problem of the positive and negative power supply timing circuit of demand fulfillment well, this circuit application in GaAs device time, the electrifying timing sequence realizing grid and drain voltage controls and power-off sequential control, and simple circuit, easy to use.
For achieving the above object, the sequential control circuit of a kind of pulse power of the present invention, comprising:
A DC/DC converter 1, is converted to the positive voltage required for load by input supply voltage;
A DC/DC converter 2, is converted to the negative voltage required for load by the positive voltage that described DC/DC converter 1 exports;
A power on detection circuit, when input power is started shooting, the negative voltage that the positive voltage export described DC/DC converter 1 and described DC/DC converter 2 export detects simultaneously;
A power-fail detection circuit, when input power shuts down, detects the positive voltage that described DC/DC converter 1 exports;
A delay circuit, plays delayed action to the opening time of switching circuit;
A switching circuit, the positive voltage export DC/DC converter 1 and load isolation, by conducting and the shutoff of switching circuit, by the output supply load of described DC/DC converter 1;
A drive circuit, for driving switch circuit;
Wherein, 1 end of DC/DC converter 1 connects with input, 2 ends of DC/DC converter 1 and 1 end of DC/DC converter 2, 1 end of power on detection circuit, 1 end of power-fail detection circuit and 1 end of switching circuit are connected, 2 ends of DC/DC converter 2 connect with 2 ends of power on detection circuit, and connect with output loading, be the negative output terminal of the sequential control circuit of the whole pulse power, 3 ends of power on detection circuit, 2 ends of power-fail detection circuit, 1 end of delay circuit links together, 2 ends of delay circuit connect with 1 end of drive circuit, 2 ends of drive circuit connect with 2 ends of switching circuit, 3 ends of switching circuit connect with output loading, be 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, electric capacity C 1, wherein, X 1elementary Same Name of Ends A connect positive input, X 1elementary different name end B connect negative input, X 1secondary Same Name of Ends C meet D 1anode, X 1secondary different name end D connect export ground, D 2anode, electric capacity C 1negative terminal all connect export 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 flyback or recommends or half-bridge or full-bridge and adopt the circuit structure of diode rectification, described DC/DC converter 2 comprises diode D 3, electric capacity C 2, electric capacity 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 export ground, V 9grid and IC 1l dRVend connects, V 10grid and IC 1h dRVend connects, IC 1p gNDend, V 9source electrode, electric capacity C 2negative terminal, C 3negative terminal all connect negative output.
Described power on detection circuit 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 with negative output, R 12 ends, R 21 end all and D 4anode connect, D 4negative electrode and V 1base stage connect, V 1collector electrode and described delay circuit in electric capacity C 4anode connect, V 1emitter with output ground be connected.
Described delay circuit comprises resistance R 3, electric capacity 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 export ground, D 6negative electrode and C 4anode connect, D 6anode and V 8grid be connected, V 8source electrode connect export ground, V 8drain electrode and described drive circuit in switching tube V 7source electrode be connected.
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 export 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 be connected, 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 be connected, 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 is connected, R 162 ends and V 7drain electrode is connected, V 7drain electrode and IC 2input I nAand I nBbe connected, R 171 end input TTL signal with outside and be connected, R 172 ends and V 7grid be connected, V 7source electrode and V 8drain electrode be connected, R 131 end and IC 2o uTAand O uTBbe connected, R 132 ends and described switching circuit in switching tube V 4, V 5grid be connected.
Described switching circuit is by resistance R 8, switching tube V 4, switching tube V 5form, wherein, R 81 end and C 1anode connect, V 4source electrode and C 1anode connect, V 4grid, V 5grid be interconnected after, with R 82 ends link together, V 4drain electrode and V 5drain electrode connect, V 5source electrode with output ground be connected, described switching tube V 4for P type metal-oxide-semiconductor, described switching tube V 5for N-type metal-oxide-semiconductor.
Beneficial effect
The sequential control circuit of the pulse power of the present invention mainly solves the power supply timing problem of the positive and negative power supply timing circuit of demand fulfillment: when input power is started shooting, negative voltage first powers on relative to positive voltage; When input power shuts down, negative voltage is relative to power down after positive voltage.Compared 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 achieve electrifying timing sequence function.Traditional sequential control circuit solves electrifying timing sequence, need to adopt the circuit such as comparator, by relatively controlling electrifying timing sequence requirement to two-way voltage, the components and parts adopted are many, and power-on time sequence control circuit of the present invention, use only the detection that 2 resistance can realize voltage, therefore simple circuit of the present invention, easy to use.
2) circuit of the present invention solves the problem of power-off sequential.In traditional sequential control circuit, only can solve electrifying timing sequence problem, can not solve when input power shuts down, the power-off sequential problem that GaAs class device is powered.The present invention utilizes the energy storage function of the output filter capacitor of DC/DC converter 1, when input power shuts down, the energy be stored in electric capacity is supplied to negative voltage to use, meet the requirement of negative voltage relative to power down after positive voltage, therefore circuit of the present invention, when can avoid being applied to the shutdown of GaAs class device, the problem that causes device failure because power-off sequential is abnormal; And additionally do not increase energy storage capacitor due to circuit of the present invention, can significantly reduce circuit volume more than 10%.
3) the invention solves overcurrent and the short-circuit protection problem of positive voltage.The power-fail detection circuit of circuit of the present invention and delay circuit are combined, overcurrent and short-circuit protection problem that DC/DC converter 1 exports positive voltage can also be solved.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of conventional sequential control circuit;
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 the present invention for the realizing circuit figure of overcurrent and short-circuit protection;
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 description below, is now further illustrated 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, power on 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:
In Fig. 4, when input power is started shooting: DC/DC converter 1 is started working, its output voltage slowly rises to+12V and exports from 0V.
When the output of DC/DC converter 1 is less than the starting resistor+4.5V of DC/DC converter 2, DC/DC converter 2 does not work, and its output voltage is 0V.Now, R 1, R 2after dividing potential drop, make V 1conducting, stops R 3to C 4charging, D 4effect be improve V 1conducting voltage, now, electric capacity C 4on there is no 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 slowly will drop to-5V from 0V, now R 1, R 2common point voltage will reduce along with the decline of DC/DC converter 2 output voltage, final when-5V sets up, its common point voltage will be not enough to make V 1conducting.R 1and R 2value select based on 2 points: one is before-5V does not start, and requires R 1and R 2the branch pressure voltage formed, make V 1conducting; Two is after-5V has started, and requires R 1and R 2the branch pressure voltage formed, make V 1turn off, namely will meet 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 tie pressure drop sum.
After the output-5V Voltage Establishment of DC/DC converter 2, triode V 1to no longer control lag circuit, but if the output of DC/DC converter 1 is not enough to puncture voltage stabilizing didoe D 5make triode V 3during conducting, triode V 2by conducting and control lag circuit, stop resistance R 3to electric capacity C 4charging, can make C equally 4on there is no voltage.
As electric capacity C 4on when there is no voltage, switching tube V 8turn off, the TTL signal of drive circuit to input does not respond, and drive circuit exports high level all the time, and switching circuit turns off, 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 electric capacity C 4start charging, C 4on voltage keeps raise, when its voltage can puncture voltage stabilizing didoe D 6and make switching tube V 8during conducting, drive circuit to input TTL signal response, and according to TTL signal condition, can make switching circuit fast conducting and shutoff, and the output voltage of DC/DC converter 1 is supplied to supported V 6use.
Above process implementation electrifying timing sequence requirement: namely during input power start, negative voltage uses prior to positive voltage supply load.The length of time of delay can pass through regulating resistance R 3, electric capacity C 4, voltage stabilizing didoe D 5and D 6value realize.
In the diagram, input power continued power, circuit normal work period: switching circuit is subject to the control of drive circuit, exports the+12V of DC/DC converter 1 and is supplied to load use.If at work sometime, there is overcurrent or short-circuit condition in load, because DC/DC converter 1 cannot provide enough energy.The output voltage of DC/DC converter 1 declines starting.When its undertension is to allow voltage-stabiliser tube D 5during conducting, triode V 3turn off, V 2conducting, electric capacity C 4electric discharge.As electric capacity C 4after electric discharge, voltage-stabiliser tube D 6no longer breakdown, metal-oxide-semiconductor V 8turn off.Driver IC 2do not respond input TTL signal, its output will remain high level, switching circuit V 4turn off ,+the 12V of DC/DC converter 1 to be exported and load overcurrent and short-circuit condition are kept apart.
After+12V the output of DC/DC converter 1 is kept apart with load overcurrent or short-circuit condition, its output voltage starts to rise.When voltage rise is to can by voltage-stabiliser tube D 5puncture and make triode V 3during conducting, V 2turn off.Delay circuit restarts work, by resistance R 3to electric capacity C 4charge.Work as C 4charging voltage puncture voltage-stabiliser tube D 6, and by metal-oxide-semiconductor V 8during conducting, driver IC 2again response is started to input TTL signal, and according to TTL signal condition, control switch pipe V 4conducting and shutoff.DC/DC converter 1 starts again as successive load is powered.
When successive 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 successive load overcurrent or short-circuit condition are eliminated, circuit recovers normal work.
The above course of work, ensure that DC/DC converter 1 exports when overcurrent and short circuit, circuit is in hiccup protections.
In the diagram, when input power shuts down: DC/DC converter 1 quits work because input noenergy provides, and its output filter capacitor C 1upper meeting has a large amount of energy.The input of DC/DC converter 2 is by diode D 3be connected on the output of DC/DC converter 1.When after input power down, DC/DC converter 2 will also can work a period of time, and due to DC/DC converter 2 employing is Buck-boost structure, the ground of its controller is connected on-5V, therefore, even if when the output of DC/DC converter 1 is 0V, DC/DC converter 2 still can work on.
Because input noenergy provides, C 1electric capacity starts power down.Work as C 1voltage be reduced to voltage-stabiliser tube D 5breakdown value below time, triode V 3turn off, V 2conducting, electric capacity C 4electric discharge, final switching tube V 8turn off.As switching tube V 8during shutoff, TTL signal can not enter drive IC 2, driver IC 2output is always high level, by the V in switching circuit 4turn off, V 5conducting.Now be stored in electric capacity C 1on energy will not use not being supplied to positive voltage load, and be all supplied to DC/DC converter 2 and use, to continue to maintain-5V voltage.After input power down, the time T that-5V can maintain presses formula (3) and calculates:
1 2 C 1 ( V D + 0.7 ) 2 = Pout &eta; T - - - ( 3 )
Wherein V dfor voltage-stabiliser tube D 5puncture voltage, 0.7 is triode V 3bE junction voltage, η is the efficiency of DC/DC converter 2, and Pout is the power output of-5V.
Above process implementation power-off sequential requirement: namely during input power shutdown, to turn off in positive voltage after 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 powers on ,+12V output voltage continues to rise, and because now-5V voltage does not start, Vsence voltage is high level, stops delay circuit charging, switching tube V 4non-conducting ,+12vout does not export; At t 1-t 2time period :-5V does not start, and Vsence is high level, continues to stop delay circuit charging, and drive circuit exports high level, switching tube V 4non-conducting ,+12vout does not export; At t 2-t 3time period :-5V starts to start, and Vsence voltage is dragged down, and no longer stops delay circuit to charge; At t 3-t 4time period: delay circuit starts charging; t 4after time, switching tube V 4conducting ,+12vout starts there is output.Therefore, can obtain from Fig. 6, whole power up, ensure that the requirement that negative voltage (-5V) powers on prior to positive voltage (+12vout).
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: circuit normally works, negative voltage-5V and+12vout all exists; t 1-t 2time period: at t 1moment, input power power down, electric capacity C 1on energy can not continue to maintain output loading, its voltage starts to decline.When the voltage on electric capacity is reduced to voltage-stabiliser tube D 5breakdown value and triode V 3bE junction voltage sum time, triode V 3turn off, V 2conducting, electric capacity C 4electric discharge, switching tube V 4turn off ,+12vout turns off, and now ,-5V voltage still exists; t 2-t 3time period, electric capacity C 1on energy continue to be supplied to-5V and use, ensure that the time of delay of negative voltage.T 3-t 4time period, C 1on energy shortage to continue maintenance-5V, negative voltage start turn off.Therefore, can obtain from Fig. 7, whole power down process, ensure that after negative voltage (-5V) in the requirement of positive voltage (+12vout) power down.
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 starts to start, and delay circuit starts charging, V 4the non-conducting of switching tube ,+12vout does not export; At t 1-t 2time period, switching tube V 4, there is overcurrent or short trouble owing to exporting in conducting, DC/DC converter 1 can not provide enough energy to maintain the stable of output voltage, and output voltage starts to decline; At t 2-t 3time period, output voltage triggers power-fail detection circuit, electric capacity C 4electric discharge, V 4turn off ,+12vout does not export; At t 3-t 4time period, repeat t o-t 1process.Therefore, can obtain from Fig. 8, t 0-t 4process, achieve the hiccup protections of overcurrent and short-circuit condition, can shield to circuit.
Fig. 5 is the present invention for the another kind of implementation of realizing circuit figure of overcurrent and short-circuit protection.When overcurrent or short circuit appear in+12vout branch road, because DC/DC converter 1 can not provide enough power to maintain the stable output of+12vout, electric capacity C 1on voltage will decline.As electric capacity C 1on voltage be reduced to voltage-stabiliser tube D 5with triode V 3bE junction voltage sum time, triode V 3to turn off, V 2conducting, electric capacity C 4start electric discharge.Now, triode V 11turn off, PMOS V 4turn off.
Work as V 4have no progeny in pass, overcurrent or short trouble will by V 4block.+ 12V branch road output voltage recovers to rise, when+12V branch road output voltage rises to voltage-stabiliser tube D 5with triode V 3bE junction voltage sum time, triode V 3conducting, V 2turn off.Now, delay circuit restarts work, after certain time of delay, and turn-on transistor V again 11with PMOS V 4.
PMOS V 4again, after conducting, if now overcurrent and short trouble do not exist, then circuit normally works.If now fault still exists, then circuit will trigger power-fail detection circuit again, turns off V 4, and after certain time of delay, the V of conducting PMOS again 4.This process, by hiccup protections when realizing 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 power on detection circuit, R 1: 12k Ω, R 2: 3.9k Ω, D 4: 1N4148;
In delay circuit, R 3: 30k Ω, C 4: 2.2 μ F, V 8: 2N7002E;
In power-fail detection circuit, R 4, R 5, R 6, R 7, R 19: 10k Ω;
In drive circuit, IC 2: UCC27424DGN, V 7: 2N7002E;
In switching circuit, V 4: SI7135DP, V 5: SI7322DN, R 8: 10k Ω.

Claims (6)

1. a sequential control circuit for the pulse power, is characterized in that it comprises:
A DC/DC converter 1, is converted to the positive voltage required for load by input supply voltage;
A DC/DC converter 2, is converted to the negative voltage required for load by the positive voltage that described DC/DC converter 1 exports;
A power on detection circuit, when input power is started shooting, the negative voltage that the positive voltage export described DC/DC converter 1 and described DC/DC converter 2 export detects simultaneously;
A power-fail detection circuit, when input power shuts down, detects the positive voltage that described DC/DC converter 1 exports;
A delay circuit, plays delayed action to the opening time of switching circuit;
A switching circuit, the positive voltage export DC/DC converter 1 and load isolation, by conducting and the shutoff of switching circuit, by the output supply load of described DC/DC converter 1;
A drive circuit, for driving switch circuit;
Wherein, 1 end of DC/DC converter 1 connects with input, 2 ends of DC/DC converter 1 and 1 end of DC/DC converter 2, 1 end of power on detection circuit, 1 end of power-fail detection circuit and 1 end of switching circuit are connected, 2 ends of DC/DC converter 2 connect with 2 ends of power on detection circuit, and connect with output loading, be the negative output terminal of the sequential control circuit of the whole pulse power, 3 ends of power on detection circuit, 2 ends of power-fail detection circuit, 1 end of delay circuit links together, 2 ends of delay circuit connect with 1 end of drive circuit, 2 ends of drive circuit connect with 2 ends of switching circuit, 3 ends of switching circuit connect with output loading, be 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, electric capacity C 1, wherein, X 1elementary Same Name of Ends A connect positive input, X 1elementary different name end B connect negative input, X 1secondary Same Name of Ends C meet D 1anode, X 1secondary different name end D connect export ground, D 2anode, electric capacity C 1negative terminal all connect export 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 flyback or recommends or half-bridge or full-bridge and adopt the circuit structure of diode rectification, described DC/DC converter 2 comprises diode D 3, electric capacity C 2, electric capacity 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 export ground, V 9grid and IC 1l dRVend connects, V 10grid and IC 1h dRVend connects, IC 1p gNDend, V 9source electrode, electric capacity C 2negative terminal, C 3negative terminal all connect negative output.
2. the sequential control circuit of the pulse power according to claim 1, is characterized in that, described power on detection circuit 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 with negative output, R 12 ends, R 21 end all and D 4anode connect, D 4negative electrode and V 1base stage connect, V 1collector electrode and described delay circuit in electric capacity C 4anode connect, V 1emitter with output ground be connected.
3. the sequential control circuit of the pulse power according to claim 1, is characterized in that, described delay circuit comprises resistance R 3, electric capacity 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 export ground, D 6negative electrode and C 4anode connect, D 6anode and V 8grid be connected, V 8source electrode connect export ground, V 8drain electrode and described drive circuit in switching tube V 7source electrode be connected.
4. 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 export 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 be connected, 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 be connected, V 2collector electrode and C 4anode connect, described switching tube V 2, switching tube V 3be NPN type triode.
5. 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 is connected, R 162 ends and V 7drain electrode is connected, V 7drain electrode and IC 2input I nAand I nBbe connected, R 171 end input TTL signal with outside and be connected, R 172 ends and V 7grid be connected, V 7source electrode and V 8drain electrode be connected, R 131 end and IC 2o uTAand O uTBbe connected, R 132 ends and described switching circuit in switching tube V 4, V 5grid be connected.
6. 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 5form, wherein, R 81 end and C 1anode connect, V 4source electrode and C 1anode connect, V 4grid, V 5grid be interconnected after, with R 82 ends link together, V 4drain electrode and V 5drain electrode connect, V 5source electrode with output ground be connected, described switching tube V 4for P type metal-oxide-semiconductor, described switching tube V 5for N-type metal-oxide-semiconductor.
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