CN102222904B - Direct-current dual-circuit power supply for supplying power - Google Patents

Direct-current dual-circuit power supply for supplying power Download PDF

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Publication number
CN102222904B
CN102222904B CN201110144963.5A CN201110144963A CN102222904B CN 102222904 B CN102222904 B CN 102222904B CN 201110144963 A CN201110144963 A CN 201110144963A CN 102222904 B CN102222904 B CN 102222904B
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China
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power supply
module
voltage
isolation
positive pole
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CN201110144963.5A
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Chinese (zh)
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CN102222904A (en
Inventor
顾善民
段宣祥
贺明智
游小杰
曹武中
杨扬
董宁
郑琼林
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北京交通大学
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Abstract

The invention relates to the field of direct-current power supplies for supplying power and provides a direct-current dual-circuit power supply for supplying power. The direct-current dual-circuit power supply for supplying the power comprises a first direct-current power supply, a second direct-current power supply, a signal detecting and triggering pulse controller, a DC-DC isolation high-frequency switch power module and a protective circuit module; the signal detecting and triggering pulse controller comprises a signal detector and a triggering pulse controller; the first direct-current power supply is connected with the DC-DC isolation high-frequency switch power module; the second direct-current power supply is connected with the protective circuit module; an output anode and an output cathode of the circuit protective module are connected in parallel with an output anode and an output cathode of the DC-DC isolation high-frequency switch power module respectively and are connected with the anode and the cathode of an external load; the signal detector is connected with the anode of the first power supply, the anode of the second power supply and the anode of the external load respectively; and the triggering pulse controller is connected with the DC-DC isolation high-frequency switch power module. The direct-current dual-circuit power supply has the advantages of prolonging the service life of the direct-current dual-circuit power supply, having short shifting time and realizing the electrical isolation of the direct-current dual-circuit power supply.

Description

A kind of direct current power supply that supplies power with double circuit
Technical field
The present invention relates to DC power supply field, relate in particular to a kind of power supply of direct current dual input.
Background technology
In power plant and electric substation, in order to give the means of power such as control, signal, protection, automatics, emergency lighting and interchange do not have a power failure, General Requirements has reliable DC power supply.Conventionally use storage battery as direct current ground agricultural, and require above-mentioned power supply to there is good stability and reliability, and its power supply capacity and quality can guarantee power consumption equipment reliably working the most serious in the situation that, relay protection part is very the key link of power plant, need to power reliably.
In tradition is used, by improving its reliability with dual input power supply, but because its protection switch suits according to mechanical switchs such as electromagnetic principle control contactors by control coil, exist switching time long, the shortcoming such as useful life is short, and noise is large; What is more due to direct current supply power with double circuit power supply power supply not 2 ground connection of isolated DC system may cause the malfunction of protection switch or according to moving, have a strong impact on device security.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of direct current power supply that supplies power with double circuit, and comprises the first DC power supply, and the second DC power supply, comprises input and trigger impulse controller, DC-DC isolation of high frequency switch power module, protective circuit module; Described input and trigger impulse controller comprise signal detector and trigger impulse controller; Described input and trigger impulse controller also comprise microcontroller; Microcontroller is connected with signal detector and trigger impulse controller respectively; Signal detector is connected with the positive pole of the first power supply, the positive pole of second source, the positive pole of external loading respectively; Trigger impulse controller is connected with DC-DC isolation of high frequency switch power module; Described microcontroller comprises discrete component, or integrated IC, or digital microcontroller, or programmable logic cells; Described microcontroller comprise voltage error amplifier, the first comparator, the second comparator, oscillator, with door; Described error amplifier connects the first comparator, the first described comparator connection oscillator and with door, described the second comparator connects and door; The described trigger impulse controller that is connected with door, error amplifier is connected respectively signal detector with the second comparator;
The positive pole of the first DC power supply is connected respectively the input positive pole of DC-DC isolation of high frequency switch power module and inputs negative pole with negative pole, and the positive pole of the second DC power supply is connected respectively the input positive pole of protective circuit module and inputs negative pole with negative pole;
The output cathode of the output cathode of circuit protection module and DC-DC isolation of high frequency switch power module is parallel-connected to the positive pole of external loading, and the output negative pole of the output negative pole of circuit protection module and DC-DC isolation of high frequency switch power module is parallel-connected to the negative pole of external loading;
Described signal detector is connected with the positive pole of the first power supply, the positive pole of second source, the positive pole of external loading respectively, and described trigger impulse controller is connected with DC-DC isolation of high frequency switch power module.
Wherein, described DC-DC isolation of high frequency switch power module is the DC-DC isolated converter high-frequency switching power supply module with isolating transformer.
Wherein, described DC-DC isolated converter high-frequency switching power supply module is normal shock DC-DC isolated converter high-frequency switching power supply module, or flyback DC-DC isolated converter high-frequency switching power supply module, or recommend DC-DC isolated converter high-frequency switching power supply module, or half-bridge DC-DC isolated converter high-frequency switching power supply module, or full-bridge DC-DC isolated converter high-frequency switching power supply module.
Wherein, described protective circuit module is made up of unilateal conduction device.
Wherein, described protective circuit module is by a diode or form; The positive pole of described diode connects the positive pole of the second DC power supply, and the negative pole of diode connects the positive pole of external loading.
Wherein, described protective circuit module is made up of the first diode and the second diode; The positive pole of the first diode connects the positive pole of the second DC power supply, and the negative pole of the first diode connects the positive pole of external loading, and the positive pole of the second diode connects the negative pole of external loading, and the negative pole of the second diode connects the negative pole of the second DC power supply.
Described compared with prior art, the present invention has the following advantages:
The present invention is by utilizing DC-DC isolation of high frequency switch power module with protection module, two DC power supply to be connected with external loading, take DC-DC isolation of high frequency switch power module as diverter switch.While there is line under-voltage fault, the switching of power supply completes by the electronic switch of DC-DC isolation of high frequency switch power module, and machinery-free action, has improved useful life, and switching time is short.Meanwhile, because DC-DC isolation of high frequency switch power module is with isolating transformer, realize the electrical isolation of direct current double loop power supply, eliminated 2 faults that ground connection causes of traditional direct current dual input power supply.
Accompanying drawing explanation
Fig. 1 is the fundamental diagram of the embodiment of the present invention one;
Fig. 2 is the supply power with double circuit fundamental diagram of the protection module that power supply is made up of a diode of a kind of direct current of the present invention;
Fig. 3 is the supply power with double circuit fundamental diagram of the protection module that power supply is made up of two diodes of a kind of direct current of the present invention;
Fig. 4 is the fundamental diagram of the embodiment of the present invention two;
Fig. 5 is the fundamental diagram of the embodiment of the present invention three;
Fig. 6 is the supply power with double circuit fundamental diagram of the microcontroller among input and the trigger impulse controller of power supply of the preferred a kind of direct current of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
With reference to Fig. 1, show the embodiment of the present invention one fundamental diagram.
This direct current power supply that supplies power with double circuit comprises the first DC power supply U s1, the second DC power supply U s2, input and trigger impulse controller C 1, DC-DC(DC-DC) and isolation of high frequency switch power module M 1with protective circuit module M 2.
The first DC power supply U s1positive pole connect DC-DC isolation of high frequency switch power module M 1the anodal a of input, the first DC power supply U s1anodal negative pole connect DC-DC isolation of high frequency switch power module M 1input negative pole k; DC-DC isolation of high frequency switch power module M 1output cathode b connect external loading R lpositive pole, DC-DC isolation of high frequency switch power module M 1output cathode c connect external loading R lnegative pole; Form thus the first loop.
The second DC power supply U s2positive pole connect protective circuit module M 2the anodal d of input, the second DC power supply U s2negative pole connect protective circuit module M 2input negative pole g; Protective circuit module M 2output cathode h connect external loading R lpositive pole, protective circuit module M 2output negative pole i connect external loading R lnegative pole; Form thus second servo loop.
The first loop and second servo loop are at external loading R ltwo ends form parallel connection, as being connected in parallel in figure a little as x, y 2 points, thus two-way input power with different circuit variations by output voltage U oparallel connection outputs to in electric loading.
Input and trigger impulse controller C 1signal detector Q respectively with the first DC power supply U s1positive pole, the second DC power supply U s2positive pole, external loading R lpositive pole be connected, input and trigger impulse controller C 1trigger impulse controller P and DC-DC isolation of high frequency switch power module M 1be connected.
As the second DC power supply U s2occur under-voltage, input and trigger impulse controller C so 1the second DC power supply U detected s2occur under-voltagely, then send trigger impulse control DC-DC isolation of high frequency switch power module M 1open electronic switch, the first DC power supply U s1by DC-DC isolation of high frequency switch power module M 1output to external loading R by predeterminated voltage l; As input and trigger impulse controller C 1the second DC power supply U detected s2recover normal, seal trigger impulse to DC-DC isolation of high frequency switch power module M 1thereby close electronic switch, by the second DC power supply U s2through protection module M 2give external loading R lpower supply.
Wherein, DC-DC isolation of high frequency switch power module M 1the DC-DC isolated converter high-frequency switching power supply module of general reference with isolating transformer, wherein DC-DC isolated converter high-frequency switching power supply module can be normal shock, flyback, recommend, the DC-DC isolated converter high-frequency switching power supply module such as half-bridge, full-bridge, can be also other derivative class DC-DC isolated converter high-frequency switching power supply modules.
Preferably, protective circuit module M 2formed by unilateal conduction device, such as the controllable devices such as diode, thyristor.General diode, the protection module superior performance being formed by diode selected in reality.
Fig. 2 and Fig. 3 show protective circuit module M 2circuit theory diagrams while being constituted by a diode.
With reference to Fig. 2, protective circuit module M 2by a diode D 1composition, diode D 1positive pole meet the second DC power supply U s2positive pole, diode D 1negative pole according to Fig. 1 connection external loading R lpositive pole.With reference to Fig. 3, protective circuit module M 2formed diode D by two diodes 1positive pole meet the second DC power supply U s2positive pole, diode D 1negative pole meet external loading R lpositive pole, diode D 2positive pole meet external loading R lnegative pole, diode D 2negative pole meet the second DC power supply U s2negative pole.
Protective circuit module M 2also can be formed by controllable devices such as thyristors the similar diode connected mode of its concrete connected mode.Protection module M 2there is output voltage U when preventing main electric input power reversal connection and under-voltage fault occurring oto main power supply U s2the effect of reverse charging.
With reference to Fig. 4, show the embodiment of the present invention two fundamental diagrams.
The first DC power supply U s1positive pole connect DC-DC isolation of high frequency switch power module M 1the anodal a of input, the first DC power supply U s1anodal negative pole connect DC-DC isolation of high frequency switch power module M 1input negative pole k; DC-DC isolation of high frequency switch power module M 1output cathode b connect external loading R lpositive pole, DC-DC isolation of high frequency switch power module M 1output cathode c connect external loading R lnegative pole.Form thus the first loop.
The second DC power supply U s2the anodal d of input of cathode connecting diode, diode D 1negative pole meet external loading R lpositive pole; The second DC power supply U s2negative pole meet diode D 2negative pole, diode D 2positive pole meet external loading R lnegative pole.Form thus second servo loop.
The first loop and second servo loop are at external loading R ltwo ends form parallel connection, as being connected in parallel in figure a little as x, y 2 points, thus two-way input power with different circuit variations by output voltage U oparallel connection outputs to in electric loading.
Input and trigger impulse controller C 1signal detector Q comprise signal detector C 11, signal detector C 14, signal detector C 15, respectively with the first DC power supply U s1positive pole, the second DC power supply U s2positive pole, external loading R lpositive pole be connected, wherein signal detector C 15with external loading R lanodal tie point be positioned at tie point x right-hand member (by figure up and down order); Input and trigger impulse controller C 1trigger impulse controller P comprise trigger impulse controller C 12, trigger impulse controller C 13, respectively with DC-DC isolation of high frequency switch power module M 1the sub-e of pulse input end, f be connected.
Signal detector C 11the first DC power supply U samples s1input voltage; Signal detector C 15the first DC power supply U samples s2input voltage; Signal detector C 14the sampling direct current power supply power supply that supplies power with double circuit outputs to external loading R loutput voltage U o; Trigger impulse controller C 12with trigger impulse controller C 13be connected to switch power module M 1the sub-e of pulse input end, f, by controlling trigger impulse control switch power module M 1output voltage, trigger impulse controller C 14the feedback voltage U of input owith the default given voltage U in controller rform output voltage control ring.
The second DC power supply U s2as main power supply, be called for short main power supply.The first DC power supply U s1as backup power supply, be called for short standby power supply.When signal detector Q detects two-way input power U s1, U s2when all normal, trigger impulse controller C 12, C 13locking pulse output, switch power module M 1stop output, main power supply U s2through protection module M 2powering load.
As main power supply U s2while there is under-voltage fault, trigger impulse controller P is by lead-out terminal C 12, C 13output trigger impulse, DC-DC isolation of high frequency switch power module M 1receive trigger impulse by pulse control terminal e, f and open DC-DC isolation of high frequency switch power module M 1electronic switch, standby power supply U s1through switch power module M 1output predeterminated voltage size, for load supplying, now main electric supply voltage U s2be less than output voltage U oand cut-off output.
When controller detects main power supply U s2while recovering normal, trigger impulse controller P blocks lead-out terminal C 12, C 13, DC-DC isolation of high frequency switch power module M 1receive trigger impulse by the sub-e of pulse input end, f and close DC-DC isolation of high frequency switch power module M 1electronic switch, standby power supply U s1stop output, main power supply U s2output power supply.
While there is line under-voltage fault, electrical source exchange completes by electronic switch, machinery-free action, and therefore noiseless, machinery-free loss, improved useful life significantly.With the DC-DC isolation of high frequency switch power module M of isolating transformer 1make standby power supply U s2with output voltage U oon electric, realize isolation, therefore 2 faults that ground connection causes of traditional direct current dual input power supply have been eliminated, when electrical source exchange, the action of electronic switch can complete the seamless of power supply and suit within the time of Millisecond, has overcome traditional mechanical switch completely and has suited normal shortcoming switching time of bringing.
In practice, input and trigger impulse controller C 1the output way of pulse control terminal do not limit single channel or two-way, can four tunnels, Shi San road or other ways.Its concrete way is determined by the topological structure of DC-DC isolated converter high-frequency switching power supply module.
Input and trigger impulse controller C that for example normal shock and flyback DC-DC isolated converter high-frequency switching power supply module need 1the trigger impulse output terminals way providing is 1 tunnel, recommends with half-bridge DC-DC isolated converter high-frequency switching power supply module high-frequency switching power supply module and needs 2 tunnels, and full-bridge DC-DC isolated converter high-frequency switching power supply module needs 4 tunnels.
Preferably, input and trigger impulse controller C 1comprise signal detector, microcontroller, trigger impulse controller.Wherein voltage sensor respectively with the first DC power supply U s1positive pole, the second DC power supply U s2positive pole, the positive pole of external loading be connected, trigger impulse controller and DC-DC isolation of high frequency switch power module M 1be connected; Signal detector detects input power U s1, U s2and output voltage U ovoltage, the output of trigger impulse controller control trigger impulse.
In reality, signal detector is generally voltage sensor, above-mentioned detection input power U s1, U s2and output voltage U othese three kinds of signal detectors can be one to be connected on the voltage coupler at voltage two ends; Also can be one to be connected on the coupling capacitance at voltage two ends.
With reference to Fig. 5, show the fundamental diagram of the Shi Lisan of reality of the present invention.
The power supply of the direct current dual input that the embodiment of the present invention provides is by the full-bridge DC-DC isolating transformer high-frequency switching power supply module M with isolating transformer 1, the protection module M being formed by two diodes 2, and input and trigger impulse controller C 1this three's composition.
The first DC power supply U s1both positive and negative polarity be connected respectively to full-bridge DC-DC isolating transformer high-frequency switching power supply module M 1the anodal a of input, input negative pole k, full-bridge DC-DC isolating transformer high-frequency switching power supply module M 1output cathode b, output negative pole c be connected respectively to external loading R lpositive pole and negative pole, the first DC power supply U s1as standby power supply.The second DC power supply U s2both positive and negative polarity be connected to respectively protective circuit module M 2the anodal d of input, input negative pole g, protective circuit module M 2output cathode h, output negative pole i be connected to respectively external loading R lboth positive and negative polarity, the second DC power supply U s2be external loading R as main power supply lpower supply.Wherein, protective circuit module M 2formed by two diodes.
Full-bridge DC-DC isolating transformer high-frequency switching power supply module with isolating transformer is by filter unit M 11, full-bridge inverting M 12, high-frequency isolation transformer M 13, rectification unit M 14and filter unit M 15composition.
Input and trigger impulse controller C 1by voltage sensor C 11, C 13, C 14, trigger impulse controller C 12and microcontroller C 15composition; Trigger impulse controller C 12the pulse output of You Si road connects full-bridge DC-DC isolating transformer high-frequency switching power supply module M 1
When two-way input power is all normal, worked by main electric power supply, when under-voltage fault occurs main power supply, standby electric electrical source exchange output.
Voltage sensor C 11, C 13, C 14respectively to voltage U s1, U s2, U osampling is transformed to microcontroller C 15the receptible electric pressure of AD sampling module, microcontroller C 15by Dui Zhe tri-road voltage sample conversions, form the closed-loop control to output voltage, produce trigger impulse via driver module C by its inner integrated PWM maker 12trigger full-bridge inverting cell operation.
The direct voltage U of input s1unit M after filtering 11filtering process after again through full-bridge inverting M 12inversion is the ac square-wave voltage of high frequency, the ac square-wave voltage process high-frequency isolation transformer M obtaining 13after transformation isolation by rectification unit M 14and filter unit M 15rectifying and wave-filtering is level and smooth direct voltage output.
Input and trigger impulse controller C 1by sampling, calculating three road voltage signals, to two-way input power U s1, U s2whether there is under-voltage fault and judge, thereby by controlling high-frequency switching power supply module M 1working condition, realize input two-way DC power supply automatically switch object.
As the second DC power supply U s2there is when under-voltage voltage sensor C 11detect under-voltage, microcontroller C 15send trigger impulse, trigger impulse controller drive amplification outputs to full-bridge DC-DC isolating transformer high-frequency switching power supply module M 1, start full-bridge DC-DC isolating transformer high-frequency switching power supply module M 1electronic switch, the first DC power supply U s1by full-bridge DC-DC isolating transformer high-frequency switching power supply module M 1external loading is powered.
In reality, controller can be overlapped by discrete components such as voltage error amplifier, comparator, trigger, latch, oscillators, or is made up of integrated IC, also can be made up of the digital microcontrollers such as single-chip microcomputer or programmable logic cells.
With reference to Fig. 6, show the microcontroller C being formed by discrete component 15fundamental diagram.
Microcontroller C 15by voltage error amplifier 11, comparator 12, comparator 13, oscillator 3 and form with door 5; The converter of connecting band isolating transformer.Here take DC-DC anti exciting converter isolation of high frequency switch power module as example, at earlier figures middle finger DC-DC isolation of high frequency switch power module M 1.
Its annexation is that the input of voltage error amplifier 11 is respectively output voltage U othrough overvoltage sensor C 13the signal U processing and obtain f2, and another road of voltage error amplifier 11 is input as default rated voltage U r2;
After the processing of error amplifier 11, obtain predeterminated voltage U r2with feedback voltage U oerror amount, this signal is device 12 mono-road input signal as a comparison, another road input signal of comparator 12 is the oscillator signal that oscillator 14 is exported, both relatively export, and obtain a pulse width variability, the square-wave signal that the cycle is certain;
Output square-wave signal as rear class with door 15 mono-road input signal, with another road input signal of door 15 be to be formed by the output signal of comparator 13;
The two-way input signal of comparator 13 is respectively: standby electric supply voltage is through overvoltage sensor C 14the signal U processing 1with default standby electric line under-voltage signal value U r1.
If standby power supply is less than under-voltage preset value U r1, comparator 13 is exported high level, thus with door 5 Yi road input signals be high level, thereby comparator 12 output pulse signals, through pulsed drive module C 12drive amplification, control M 1the switching tube break-make work of converter, converter M 1output predeterminated voltage U r2; If standby power supply is higher than default under-voltage value U r1, comparator 13 output low level signals, with door 5 Yi road input signals be low level, with door 5 output low levels, thereby the switch of converter ends always, converter quits work.
When forming or formed by digital microcontrollers such as single-chip microcomputers by integrated IC, or programmable logic cells form time, its principle of compositionality is identical with above-mentioned principle.
For example, when microcontroller is TMS320LF2407A type DSP (Digital Signal Processing, Digital Signal Processing) when microcontroller, the DC-DC isolated converter high-frequency switching power supply module of its control is full-bridge isolated converter high-frequency switching power supply module, TMS320LF2407A type DSP microcontroller is mainly by analog to digital converter, pwm pulse generation unit, accumulator, the compositions such as arithmetic unit, analog to digital converter gathers the voltage signal of voltage sensor, the analog quantity of output voltage is converted to proportional digital quantity, then with the digital quantity of the corresponding ratio of default output voltage through accumulator, the computing comparison of arithmetic unit, the compare operation is here realized by program.
In the time that the digital quantity of output voltage is greater than the digital quantity of default output voltage, the pulse conducting duty ratio that pwm pulse generation unit produces reduces, then passes through pulsed drive module C 12drive amplification, thus the switching tube of full-bridge converter is cut-off, output voltage is reduced; When the digital quantity of output voltage is less than default output voltage numeral amount, it is large that the conducting duty ratio of the triggering signal that pwm pulse generation unit produces becomes, through pulsed drive module C 12drive amplification, makes the conducting duty ratio of switching tube become large, converter output voltage is raise, by voltage sensor C 11, C 13, C 14gather the voltage of dual input power supply, and then judge power supply dead electricity situation, thereby as aforementioned, microcontroller C 15by analog to digital converter and pwm pulse generation unit and pulse driver unit C 12work, make corresponding action.
The direct current provided by the present invention power supply that supplies power with double circuit, take the DC-DC isolation of high frequency switch power module of setting up isolating transformer as diverter switch, has realized electrical isolation and the object of switching fast, the reliability of DC-DC isolation of high frequency switch power module is high, with respect to this class switch of traditional contactor, the responsiveness of the responsiveness of the electronic power switch of the high frequency of the DC-DC converter inside traditional switch such with contactor is compared has incomparable advantage, the electronic switch of DC-DC isolation of high frequency switch power module has good useful life compared with traditional contactor class switch, the isolating transformer of DC-DC isolation of high frequency switch power module has been realized the electrical isolation of two-way input power, thereby electrical isolation and the object of switching are fast realized, have good reliability, noiseless, switching fast, the advantage such as long service life.
Simultaneously DC-DC isolation high-frequency converter has multi-protective function, as short circuit, overvoltage, under-voltage, overcurrent, the defencive function such as overheated.Short-circuit protection is by the current sensor electric current of output current or internal switch pipe and the predefined current value relatively amplification through operational amplifier of sampling; if be greater than current value in advance; represent overcurrent, operational amplifier output high level on-off switching tube, converter quits work.The protections such as overload, overvoltage, excess temperature and overcurrent are similar; all through compare with default value the cut-offfing of switching tube of control change device then of corresponding transducer (current sensor, voltage sensor, temperature sensor); and then the work of control change device or stop, to reach defencive function.
Above two-way DC power supply provided by the present invention is described in detail, applied specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention meanwhile.

Claims (6)

1. the direct current power supply that supplies power with double circuit, comprises the first DC power supply, and the second DC power supply, is characterized in that: also comprise input and trigger impulse controller, DC-DC isolation of high frequency switch power module, protective circuit module; Described input and trigger impulse controller comprise signal detector and trigger impulse controller; Described input and trigger impulse controller also comprise microcontroller; Microcontroller is connected with signal detector and trigger impulse controller respectively; Trigger impulse controller is connected with DC-DC isolation of high frequency switch power module; Described microcontroller comprises discrete component; Described discrete component comprise voltage error amplifier, the first comparator, the second comparator, oscillator, with door; The output of described voltage error amplifier connects the input of described the first comparator, another input of the first described comparator connects described oscillator, the output of the first described comparator connects input described and door, and the output of the second described comparator connects another input described and door; Described be connected described trigger impulse controller with the output of door, the input of described voltage error amplifier and described the second comparator is connected respectively described signal detector; The positive pole of described the first DC power supply is connected respectively the input positive pole of described DC-DC isolation of high frequency switch power module and inputs negative pole with negative pole, and the positive pole of described the second DC power supply is connected respectively the input positive pole of described protective circuit module and inputs negative pole with negative pole;
The output cathode of the output cathode of described protective circuit module and described DC-DC isolation of high frequency switch power module is parallel-connected to the positive pole of external loading, and the output negative pole of the output negative pole of described protective circuit module and described DC-DC isolation of high frequency switch power module is parallel-connected to the negative pole of described external loading;
Described signal detector is connected with the positive pole of described the first DC power supply, the positive pole of the second DC power supply, the positive pole of external loading respectively, obtain respectively the first DC power supply voltage, the second DC power supply voltage, output voltage, described trigger impulse controller is connected with described DC-DC isolation of high frequency switch power module;
When described microcontroller is by comparing calculation the second DC power supply voltage and corresponding default voltage, when the second DC power supply voltage collecting described in knowing is less than the default voltage of described correspondence, the second DC power supply occurs under-voltage, microcontroller sends the start pulse signal of high level, the closed electronic switch of described DC-DC isolation of high frequency switch power module, described the first DC power supply is pressed default Voltage-output to external loading;
When described microcontroller is by the second DC power supply voltage and corresponding default voltage described in comparing calculation, when the second DC power supply voltage collecting described in knowing is greater than the default voltage of described correspondence, it is normal that the second DC power supply is recovered, microcontroller sends low level sealing trigger impulse, described DC-DC isolation of high frequency switch power module disconnects electronic switch, is powered to external loading by the second DC power supply.
2. the direct current as claimed in claim 1 power supply that supplies power with double circuit, is characterized in that:
Described DC-DC isolation of high frequency switch power module is the DC-DC isolated converter high-frequency switching power supply module with isolating transformer.
3. the direct current as claimed in claim 2 power supply that supplies power with double circuit, is characterized in that:
Described DC-DC isolated converter high-frequency switching power supply module is normal shock DC-DC isolated converter high-frequency switching power supply module, or flyback DC-DC isolated converter high-frequency switching power supply module, or recommend DC-DC isolated converter high-frequency switching power supply module, or half-bridge DC-DC isolated converter high-frequency switching power supply module, or full-bridge DC-DC isolated converter high-frequency switching power supply module.
4. the direct current as claimed in claim 1 power supply that supplies power with double circuit, is characterized in that:
Described protective circuit module is made up of unilateal conduction device.
5. the direct current as claimed in claim 4 power supply that supplies power with double circuit, is characterized in that:
Described protective circuit module is made up of a diode; The positive pole of described diode connects the positive pole of the second DC power supply, and the negative pole of diode connects the positive pole of external loading.
6. the direct current as claimed in claim 4 power supply that supplies power with double circuit, is characterized in that:
Described protective circuit module is made up of the first diode and the second diode; The positive pole of the first diode connects the positive pole of the second DC power supply, and the negative pole of the first diode connects the positive pole of external loading, and the positive pole of the second diode connects the negative pole of external loading, and the negative pole of the second diode connects the negative pole of the second DC power supply.
CN201110144963.5A 2011-05-31 2011-05-31 Direct-current dual-circuit power supply for supplying power CN102222904B (en)

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