CN1988308A - Parallel democratic bus uniform flow constant current method and its device - Google Patents
Parallel democratic bus uniform flow constant current method and its device Download PDFInfo
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- CN1988308A CN1988308A CN 200610123714 CN200610123714A CN1988308A CN 1988308 A CN1988308 A CN 1988308A CN 200610123714 CN200610123714 CN 200610123714 CN 200610123714 A CN200610123714 A CN 200610123714A CN 1988308 A CN1988308 A CN 1988308A
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Abstract
This invention discloses a uniform and constant current method for parallel democratic bus, which compares current signals of constant branches with bus mean value and suppresses the branches with current exceeding the mean value, and carries out constant control to the general current by the constant current branches to reach the aim of mean distribution of the branches and constant general current, at the same time, the branches have their independent protection circuit and common indication to fault.
Description
Technical field
The present invention relates to a kind of current-sharing constant flow method, particularly a kind of parallel democratic bus uniform flow constant current method; The invention still further relates to the device of realizing said method.
Background technology
Electrokinetic cell change into detection system or other Constant Current Control System in, the constant-current source technology is one of the key technology that is related to the Performance And Reliability of whole system, the accuracy that the direct relation product detects and the quality of product.The linear constant-current source of big electric current commonly used at present simple parallel-connection structure or the principal and subordinate's trailing type current-sharing parallel-connection structures of adopting more.
For simple parallel way, owing to do not have the current-sharing measure or use simple resistance current equalizing method, and there is certain dispersiveness in each branch road parameter, it is unequal to cause each branch current to distribute.The branch road bigger than normal for electric current transships easily, and electric current branch road less than normal then causes power dissipation, causes population size to can not get performance.Simultaneously, use flows resistance to make the constant-current source impedance increase, limited the application of big electric current.For principal and subordinate's trailing type current-sharing constant current, once breaking down, main branch road can cause that then whole constant-current source is out of control, lack surveillance and control measure easily and effectively simultaneously, its reliability is not high.
Summary of the invention
It is a kind of simple, practical that order of the present invention is to provide, reliable parallel connection type democracy bus current-sharing constant-current device, thereby can overcome simple parallel-connection structure can't current-sharing and the principal and subordinate follow the not high shortcoming of parallel-connection structure reliability, improve the constant current quality of constant-current source.
Purpose of the present invention can realize by following technical measures: a kind of parallel democratic bus uniform flow constant current method, to independently current sampling circuit is set separately in each constant current branch road, each the constant current branch current signal of gained of will sampling earlier outputs to bus by the identical current-limiting resistance of resistance after amplifier is amplified, form average value signal on bus; The average value signal that forms on each the constant current branch current signal of gained and the bus of will sampling again compares by the voltage integrating meter device in each constant current branch road, and electric current will be suppressed greater than the branch current of mean value; By constant-current circuit total current is carried out constant current control simultaneously.
In each constant current branch road, be provided with the overload protecting circuit that independently is used under branch current overload or power tube puncture situation, providing protection; The overload protecting circuit of each constant current branch road is provided with the output of public faulty indication bus, and when one of them branch road breaks down, the fault bus level will be dragged down.
Realize the parallel connection type democracy bus current-sharing constant-current device of said method, comprise and be used for averaging the parallel current-sharing module of distributing each branch current importing total constant current, be used for total current is carried out the constant current control module and the shunt that is used for total constant current output is obtained sampled signal of constant current, each current-sharing module mainly is provided with the current sample amplifying circuit, current-limiting resistance and voltage ratio suppress circuit, the input of branch road constant current converts the voltage signal of each branch current correspondence to through the sampling amplifying circuit, be connected to the average voltage signal that forms on the current equalizing bus bar through current-limiting resistance again, the output voltage signal of average voltage signal and sampling amplifying circuit inserts voltage ratio and suppresses circuit, and voltage ratio suppresses the output control branch road constant current input of circuit; Total continuous current output is obtained sampled signal input constant current control module through shunt, and the control output of constant current control module is connected to the constant current control input end on all current-sharing module in parallel.
Described sampling amplifying circuit mainly comprises sampling resistor R1 and operational amplifier U1, the same end of oppisite phase of this operational amplifier U1 is connected to the two ends of sampling resistor R1, its output one road is connected to current-limiting resistance R6, and another road is connected to voltage ratio and suppresses circuit.
Described voltage ratio suppresses circuit and mainly comprises voltage integrating meter device U2, field effect transistor Q1 and triode Q2, wherein the in-phase end of this voltage integrating meter device U2 connects the sampling amplification circuit output end, end of oppisite phase connects the current equalizing bus bar end, its output connects the base stage of triode Q2 successively, the collector electrode of triode Q2 connects the grid of field effect transistor Q1, and the source electrode of effect pipe Q1 and drain electrode are serially connected in branch road constant current input.
Described current-sharing module also comprises overload protecting circuit; this protective circuit mainly comprises fuse F1, triode Q3 and diode D3; the base stage of this triode Q3 and emitter are parallel to the circuit two ends that are concatenated into by fuse F1 and sampling resistor R1, and the collector electrode of triode Q3 is connected to the negative electrode of diode D3.
Described overload protecting circuit is provided with failure indicating circuit, and this circuit comprises diode D4 and light-emitting diode D2, and diode D4 is connected in the fault alarm bus, and both negative electrodes all link to each other with the triode Q3 emitter of protective circuit.
Described constant current control module mainly comprises operational amplifier U3, U4, integrator U5 and triode Q4, total current output signal through the shunt sampling, be input to two-stage calculation amplifier U3, U4 successively and form amplifying signal, enter controlled signal among the integrator U5 again, and the constant current control input end of all constant flow modules in parallel is controlled by triode Q4.
The present invention adopts the parallel-connection structure of democracy bus, and the average current of the voltage levvl reflection branch road of democracy bus carries out current limliting for the branch road that surpasses this level, makes that finally all branch current trends are consistent.Arbitrary branch road breaks down can not influence the work of constant-current source integral body.The present invention compared with prior art has following advantage:
(1) and simple parallel-connection structure relatively, constant current is effective, the utilance of power device is improved;
(2) and principal and subordinate's follower type structure relatively, have redundant ability and enough safeguard measures, reliability, fail safe is higher;
(3) and principal and subordinate's follower type structure relatively, the control loop time delay is short, helps preventing the formation of vibrating.
Description of drawings
Fig. 1 is a structural principle block diagram of the present invention.
Fig. 2 is a constant current control module schematic diagram of the present invention.
Fig. 3 is a parallel connection type democracy current equalizing bus bar individual module structural representation of the present invention.
Concrete enforcement
As shown in Figure 1, be structural principle block diagram of the present invention, apparatus of the present invention comprise and are used for averaging the parallel current-sharing module of distributing each branch current to importing total constant current, be used for total current is carried out the constant current control module and the shunt that is used for total constant current output is obtained sampled signal of constant current, each current-sharing module mainly is provided with the current sample amplifying circuit, current-limiting resistance and voltage ratio suppress circuit, the input of branch road constant current converts the voltage signal of each branch current correspondence to through the sampling amplifying circuit, be connected to the average voltage signal that forms on the current equalizing bus bar through current-limiting resistance again, the output voltage signal of average voltage signal and sampling amplifying circuit inserts voltage ratio and suppresses circuit, and voltage ratio suppresses the output control branch road constant current input of circuit; Total continuous current output is obtained sampled signal input constant current control module through shunt, and the control output of constant current control module is connected to the constant current control input end on all current-sharing module in parallel.
Above-mentioned in each constant current branch road, will sample earlier each constant current branch current signal of gained of current sampling circuit outputs to bus by the identical current-limiting resistance of resistance after amplifier is amplified, form average value signal on bus; The average value signal that forms on each the constant current branch current signal of gained and the bus of will sampling again compares by the voltage integrating meter device in each constant current branch road, and electric current will be suppressed greater than the branch current of mean value, make that finally all branch currents trends are consistent.By constant-current circuit the input and output total current is carried out constant current control simultaneously.
As shown in Figure 3, be parallel connection type democracy current equalizing bus bar individual module structural representation of the present invention.The sampling amplifying circuit of each current-sharing module mainly comprises sampling resistor R1 and operational amplifier U1, the same end of oppisite phase of this operational amplifier U1 is connected to the two ends of sampling resistor R1, its output one road is connected to current-limiting resistance R6, and another road is connected to voltage ratio and suppresses voltage integrating meter device U2 in the circuit.Wherein each branch current is enlarged into voltage signal through signal sampling and after by operational amplifier U1, and signal amplitude and branch current are linear.
Voltage ratio suppresses circuit and mainly comprises voltage integrating meter device U2, field effect transistor Q1 and triode Q2, wherein the in-phase end of this voltage integrating meter device U2 connects the sampling amplification circuit output end, end of oppisite phase connects the current equalizing bus bar end, its output connects the base stage of triode Q2 successively, the collector electrode of triode Q2 connects the grid of field effect transistor Q1, and the source electrode of effect pipe Q1 and drain electrode are serially connected in branch road constant current input.For the branch road of current versus voltage signal greater than bus average voltage signal, comparator will be exported high level, make triode Q2 conducting degree increase, and the grid voltage of power field effect pipe Q1 is descended, branch current is suppressed, and reaches the purpose that each branch current reaches unanimity.
Also comprise overload protecting circuit in the current-sharing module; this protective circuit mainly comprises fuse F1, triode Q3 and diode D3; the base stage of this triode Q3 and emitter are parallel to the circuit two ends that are concatenated into by fuse F1 and sampling resistor R1, and the collector electrode of triode Q3 is connected to the negative electrode of diode D3.The base voltage of triode Q3 is controlled by the pressure drop of fuse F1 and sampling resistor R1, if pressure drop is excessive, triode Q3 controls the grid voltage that voltage ratio suppresses the field effect transistor Q1 of circuit with conducting by diode D3, and suppressing electric current increases.If power tube punctures, fuse will blow because of overload, and this branch road module is deactivated.
Above-mentioned overload protecting circuit also is provided with failure indicating circuit, and this circuit comprises diode D4 and light-emitting diode D2, and diode D4 is connected in the fault alarm bus, and both negative electrodes all link to each other with the triode Q3 emitter of protective circuit.After the complete conducting of triode Q3, can the voltage of fault bus be dragged down by this diode D4, reporting system is taked counter-measure, and simultaneous faults indicator light light-emitting diode D2 also will light.For total capacity redundant system is arranged, after indivedual branch roads were deactivated, because the control of constant-current circuit, total current was with unaffected, and the electric current of fault branch will on average be shared by all the other branch roads.So this circuit safety, reliability is high.
As shown in Figure 2, for constant current control module schematic diagram of the present invention, mainly comprise operational amplifier U1, U2, integrator U3 and triode Q2, the differential signal of exporting through the total current of shunt sampling is input to operational amplifier U1, after the difference amplification, signal is delivered to U2 again and is carried out the homophase amplification.Be directly proportional with the electric current of the shunt of flowing through through the signal voltage after the two-stage amplification, this signal voltage enters the end of oppisite phase of integrator U3 again, compares integration with the set point that is input to the U3 in-phase end, controlled signal.Triode Q2 is used for that the output signal of U3 is carried out electric current and amplifies, and is used to drive the grid (each grid also is connected to pull down resistor, constitutes emitter follower with Q2) of the field effect transistor of current-sharing module.If flow through the electric current of shunt less than set point in the major loop, the voltage that then is input to the integrator end of oppisite phase is lower than the setting voltage of in-phase end, integrator output voltage rises, grid voltage through the power field effect pipe in the current-sharing module of Q2 driving rises, the conducting degree increases, and makes main circuit current rise; Otherwise greater than set point, then power field effect pipe conducting degree descends as if main circuit current, makes main circuit current descend.Said process makes that finally main circuit current is stabilized in set point, thereby circuit reaches the purpose of current constant.
The present invention adopts the parallel-connection structure of democracy bus, and the average current of the voltage levvl reflection branch road of democracy bus carries out current limliting for the branch road that surpasses this level, makes that finally all branch current trends are consistent.Arbitrary branch road breaks down can not influence the work of constant-current source integral body, and simultaneity factor can be monitored the working condition of constant-current source easily by the voltage levvl that detects current equalizing bus bar.Therefore avoided equal flow problem in simple parallel-connection structure ground and principal and subordinate to follow the not high problem of reliability of parallel-connection structure.
Claims (9)
1, a kind of parallel democratic bus uniform flow constant current method, it is characterized in that: to independently current sampling circuit is set separately in each constant current branch road, each the constant current branch current signal of gained of will sampling earlier outputs to bus by the identical current-limiting resistance of resistance after amplifier is amplified, form average value signal on bus; The average value signal that forms on each the constant current branch current signal of gained and the bus of will sampling again compares by the voltage integrating meter device in each constant current branch road, and electric current will be suppressed greater than the branch current of mean value; By constant-current circuit total current is carried out constant current control simultaneously.
2, parallel democratic bus uniform flow constant current method according to claim 1 is characterized in that being provided with in each constant current branch road the overload protecting circuit that independently is used for providing protection under branch current overload or power tube puncture situation.
3, parallel democratic bus uniform flow constant current method according to claim 1 and 2, the overload protecting circuit that it is characterized in that each constant current branch road are provided with public faulty indication bus output, and when one of them branch road breaks down, the fault bus level will be dragged down.
4, a kind of parallel connection type democracy bus current-sharing constant-current device, it is characterized in that: comprise being used for averaging the parallel current-sharing module of distributing each branch current importing total constant current, be used for total current is carried out the constant current control module and the shunt that is used for total constant current output is obtained sampled signal of constant current, each current-sharing module mainly is provided with the current sample amplifying circuit, current-limiting resistance and voltage ratio suppress circuit, the input of branch road constant current converts the voltage signal of each branch current correspondence to through the sampling amplifying circuit, be connected to the average voltage signal that forms on the current equalizing bus bar through current-limiting resistance again, the output voltage signal of average voltage signal and sampling amplifying circuit inserts voltage ratio and suppresses circuit, and voltage ratio suppresses the output control branch road constant current input of circuit; Total continuous current output is obtained sampled signal input constant current control module through shunt, and the control output of constant current control module is connected to the constant current control input end on all current-sharing module in parallel.
5, parallel connection type democracy bus current-sharing constant-current device according to claim 4, it is characterized in that: described sampling amplifying circuit mainly comprises sampling resistor R1 and operational amplifier U1, the same end of oppisite phase of this operational amplifier U1 is connected to the two ends of sampling resistor R1, its output one road is connected to current-limiting resistance R6, and another road is connected to voltage ratio and suppresses circuit.
6, parallel connection type democracy bus current-sharing constant-current device according to claim 4, it is characterized in that: described voltage ratio suppresses circuit and mainly comprises voltage integrating meter device U2, field effect transistor Q1 and triode Q2, wherein the in-phase end of this voltage integrating meter device U2 connects the sampling amplification circuit output end, end of oppisite phase connects the current equalizing bus bar end, its output connects the base stage of triode Q2 successively, the collector electrode of triode Q2 connects the grid of field effect transistor Q1, and the source electrode of effect pipe Q1 and drain electrode are serially connected in branch road constant current input.
7, parallel connection type democracy bus current-sharing constant-current device according to claim 4; it is characterized in that: described current-sharing module also comprises overload protecting circuit; this protective circuit mainly comprises fuse F1, triode Q3 and diode D3; the base stage of this triode Q3 and emitter are parallel to the circuit two ends that are concatenated into by fuse F1 and sampling resistor R1, and the collector electrode of triode Q3 is connected to the negative electrode of diode D3.
8, parallel connection type democracy bus current-sharing constant-current device according to claim 7; it is characterized in that: described overload protecting circuit is provided with failure indicating circuit; this circuit comprises diode D4 and light-emitting diode D2; diode D4 is connected in the fault alarm bus, and both negative electrodes all link to each other with the triode Q3 emitter of protective circuit.
9, parallel connection type democracy bus current-sharing constant-current device according to claim 1, it is characterized in that: described constant current control module mainly comprises operational amplifier U3, U4, integrator U5 and triode Q4, total current output signal through the shunt sampling, be input to two-stage calculation amplifier U3, U4 successively and form amplifying signal, enter controlled signal among the integrator U5 again, and the constant current control input end of all constant flow modules in parallel is controlled by triode Q4.
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| CNB2006101237147A CN100464478C (en) | 2006-11-23 | 2006-11-23 | Parallel democratic bus uniform flow constant current method and its device |
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| CNB2006101237147A CN100464478C (en) | 2006-11-23 | 2006-11-23 | Parallel democratic bus uniform flow constant current method and its device |
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| CN1988308A true CN1988308A (en) | 2007-06-27 |
| CN100464478C CN100464478C (en) | 2009-02-25 |
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Cited By (8)
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| CN101853038A (en) * | 2010-06-12 | 2010-10-06 | 中兴通讯股份有限公司 | Quick-response constant current source parallel system and implementation method thereof |
| CN101710701B (en) * | 2009-12-17 | 2012-02-01 | 哈尔滨工程大学 | Current sharing control circuit and control method of double-current sharing buses of parallel DC switch power supply |
| CN101634867B (en) * | 2009-06-12 | 2012-02-08 | 深圳市科陆电子科技股份有限公司 | High-current device of high-precision standard DC current source |
| CN102594157A (en) * | 2012-04-05 | 2012-07-18 | 重庆安谐新能源技术有限公司 | Signal acquisition device and processing method for alternating current power current-sharing output system |
| CN102802328A (en) * | 2012-09-05 | 2012-11-28 | 英飞特电子（杭州）股份有限公司 | Constant current driver of LED (light emitting diode) light source and LED lamp |
| CN104659899A (en) * | 2014-12-29 | 2015-05-27 | 西安华为技术有限公司 | Method, device and system for flow equalization |
| CN110602832A (en) * | 2019-10-09 | 2019-12-20 | 杰华特微电子（杭州）有限公司 | LED control circuit and control method |
| CN111158415A (en) * | 2018-11-08 | 2020-05-15 | 中车株洲电力机车研究所有限公司 | Current sharing control device and method for power module |
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| US5164890A (en) * | 1990-03-29 | 1992-11-17 | Hughes Aircraft Company | Current share scheme for parallel operation of power conditioners |
| JP4022377B2 (en) * | 2001-06-01 | 2007-12-19 | デンセイ・ラムダ株式会社 | Redundant power supply system |
| JP3653078B2 (en) * | 2002-12-12 | 2005-05-25 | 東光株式会社 | Switching constant current power supply |
| CN2750544Y (en) * | 2004-12-25 | 2006-01-04 | 潍坊华光通讯有限公司 | Switching power supply of scheduling communication system |
| CN100379112C (en) * | 2005-07-07 | 2008-04-02 | 艾默生网络能源有限公司 | Average current type current-equalizing circuit and its formed power supply and power supply system |
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| CN101634867B (en) * | 2009-06-12 | 2012-02-08 | 深圳市科陆电子科技股份有限公司 | High-current device of high-precision standard DC current source |
| CN101710701B (en) * | 2009-12-17 | 2012-02-01 | 哈尔滨工程大学 | Current sharing control circuit and control method of double-current sharing buses of parallel DC switch power supply |
| CN101853038A (en) * | 2010-06-12 | 2010-10-06 | 中兴通讯股份有限公司 | Quick-response constant current source parallel system and implementation method thereof |
| CN101853038B (en) * | 2010-06-12 | 2013-12-11 | 中兴通讯股份有限公司 | Quick-response constant current source parallel system and implementation method thereof |
| CN102594157A (en) * | 2012-04-05 | 2012-07-18 | 重庆安谐新能源技术有限公司 | Signal acquisition device and processing method for alternating current power current-sharing output system |
| CN102802328A (en) * | 2012-09-05 | 2012-11-28 | 英飞特电子（杭州）股份有限公司 | Constant current driver of LED (light emitting diode) light source and LED lamp |
| CN102802328B (en) * | 2012-09-05 | 2015-09-09 | 英飞特电子（杭州）股份有限公司 | A kind of constant-flow driver of LED light source and LED lamp |
| CN104659899A (en) * | 2014-12-29 | 2015-05-27 | 西安华为技术有限公司 | Method, device and system for flow equalization |
| CN104659899B (en) * | 2014-12-29 | 2018-08-21 | 西安华为技术有限公司 | A kind of current equalizing method, apparatus and system |
| CN111158415A (en) * | 2018-11-08 | 2020-05-15 | 中车株洲电力机车研究所有限公司 | Current sharing control device and method for power module |
| CN110602832A (en) * | 2019-10-09 | 2019-12-20 | 杰华特微电子（杭州）有限公司 | LED control circuit and control method |
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