CN103269166B - There is the converter of precharge defencive function - Google Patents
There is the converter of precharge defencive function Download PDFInfo
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- CN103269166B CN103269166B CN201310211326.4A CN201310211326A CN103269166B CN 103269166 B CN103269166 B CN 103269166B CN 201310211326 A CN201310211326 A CN 201310211326A CN 103269166 B CN103269166 B CN 103269166B
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Abstract
The present invention proposes a kind of converter with precharge defencive function, including main circuit and control circuit, described main circuit includes power end, brake unit, filter unit, inversion unit and precharge protection DC output unit, the input of precharge protection DC output unit is connected with power end, and the outfan of precharge protection DC output unit is respectively equipped with positive direct-current bus and negative dc bus; Described precharge protection DC output unit include being connected between power end anode and positive direct-current bus for forward conduction and the forward protection branch road that can disconnect because crossing stream fusing, and the reverse branch road for reversely ending being connected between power end anode and negative dc bus. When having short circuit phenomenon on converter bus, the present invention just can disconnect the connection of power supply in pre-charge process, and converter is protected, it is to avoid produce electric arc and originally intact device or pcb board are produced secondary damage, be preferably minimized by equipment downtime.
Description
Technical field
The present invention relates to converter, be specifically related to the converter with precharge defencive function.
Background technology
Converter is to be controlled power electronic devices from computer (cpu controller), industrial-frequency alternating current becomes frequency and the electrical equipment of the adjustable three-phase alternating current of voltage, in order to drive ac motor to carry out the frequency control of continuously smooth. Converter includes main circuit and control circuit, the main circuit of wherein traditional converter, for three-phase alternating current inverter, as it is shown in figure 1, include power end 1, rectification unit 2 ', precharge loop 4, brake unit 3, filter unit 5 and inversion unit 6. Rectification unit 2 ': formed full-wave bridge rectifier circuit by diode D1 '～D6 ', is Rectified alternating current by the industrial frequency AC electric rectification of input; Precharge loop 4: be made up of charging resistor R1 ' and switch K1 '; Brake unit 3: when the motor of transducer drive quickly stops, motor is in generating state, energy is by returning on dc bus after the fly-wheel diode rectification on IGBT, busbar voltage is made to raise, when DC voltage exceedes certain value, the IGBTV7 action of brake unit, discharges this energy by external braking resistor, makes DC bus-bar voltage no longer increase; Filter unit 5: be made up of filter capacitor C1, C2 and equalizing resistance RC1, RC2, becomes smoother unidirectional current, for the inversion unit of rear class by Rectified alternating current; Inversion unit 6: be made up of IGBTV1～V6, is frequency by DC inverter and the adjustable three-phase alternating current of voltage exports motor; Additionally, control circuit provides control signal for main circuit, to complete the controls such as the connection of circuit output adjustment, various protection, input/output interface.
Before converter powers on, the DC voltage UDC=0 on the filter capacitor in filter unit 5, thus, at converter powered on moment, flow to DC filter capacitor by there being a very big dash current through rectification unit 2 ', the effect of charging resistor R1 ' is the dash current of restriction power up, after busbar voltage UDC is charged to certain voltage, time delay or by control unit control switch K1 ' Guan Bi, charging resistor R1 ' is excised, electric current is by K1 directly on dc bus, and charging resistor R1 ' is referred to as precharge loop with controlling switch K1 '. but, the effect of its current limliting is only considered during the general Design of Inverter of precharge loop 4 part, do not have the protective effect to converter, bus such as, has dust or foreign body and moist, capacitance short-circuit, when braking resistor short circuit or IGBT puncture, can cause bus that short circuit phenomenon occurs, bus will produce when converter powers on big electric current, as continued to be connected by K1 ', now short circuit current is by directly through the rectification unit 2 ' of converter and bus, cause the more macrolesion of converter, produce big electric arc, originally good device or pcb board may be damaged, form secondary injury.
Summary of the invention
Not enough for above-mentioned prior art; the technical problem to be solved in the present invention is to provide the converter of a kind of difference and existing structure; converter is made to have precharge defencive function when powering on; prevent from damaging converter because of dc bus short circuit; prevent conducting moment from producing big electric arc and originally intact device or pcb board are caused secondary injury, thus the downtime of equipment is preferably minimized.
For solving above-mentioned technical problem, the technical solution used in the present invention is as follows: have the converter of precharge defencive function, including main circuit with for main circuit provides the control circuit of control signal, described main circuit includes power end, brake unit, filter unit and inversion unit; Also including precharge protection DC output unit, the input of precharge protection DC output unit is connected with power end, and the outfan of precharge protection DC output unit is respectively equipped with positive direct-current bus and negative dc bus; Described precharge protection DC output unit include being connected between power end anode and positive direct-current bus for forward conduction and the forward protection branch road that can disconnect because crossing stream fusing, and be connected to the reverse branch road for reversely ending between power end anode and negative dc bus; Brake unit, filter unit and inversion unit are all connected between positive direct-current bus and negative dc bus. Such structure can make when before powering on, dc bus exists short-circuit conditions, in the moment powered on because forward protection branch road disconnects and makes power end and converter disconnect, stops powering on.
Further technical scheme is, described forward protection branch road include switching switch, fuse, can forward conduction control switch and can the triggering branch road of forward conduction; Control switch and be connected across between power end anode and positive direct-current bus; The common port of switching switch by fuse with trigger branch road be connected in series to power end anode, the first end of switching switch is connected to positive direct-current bus, and the second end of switching switch is connected to the control end controlling switch. Such structure make as rectification unit can forward conduction control switch be off-state when pre-charge process starts; in a short-circuit situation; short circuit current is through triggering branch road; fuse blows and make triggering branch road disconnect; rectification unit is not affected by short circuit current completely; and owing to the operating current of triggering branch road is less; allow to the fuse selecting protection value less; fusing faster it is easier to when short circuit current is through overcurrent fuse; avoid electric arc to produce further, effectively prevent the secondary injury to other device.
As a preferred embodiment of the present invention, described power end is three-phase alternating current power end, the quantity of power end anode is three, it is respectively connected with a forward protection branch road between each power end anode and positive direct-current bus, and between each power end anode and negative dc bus, is respectively connected with a reverse branch road; The triggering branch road of each described forward protection branch road includes charging resistor and the first diode, the negative electrode of the first diode is connected with the common port of switching switch, and what the anode of the first diode passed through charging resistor and fuse is connected in series to corresponding power end anode; Each described reverse branch road includes the second diode, and the anode of the second diode is connected with negative dc bus, and the negative electrode of the second diode connects with corresponding power end anode.
The preferred version of the present invention can also be, described power end is DC power supply terminal, and described power end anode is positive supply, and power end negative terminal is negative supply; The triggering branch road of described forward protection branch road includes charging resistor; Described reverse branch road is open circuit; Negative supply is connected with negative dc bus.
Further, described triggering branch road also includes the 3rd diode being connected between charging resistor and switching switch, and the anode of described 3rd diode is connected with charging resistor, and the negative electrode of the 3rd diode is connected with the common port of switching switch.
Preferably, the described switch that controls is controllable silicon, and silicon controlled anode is connected with power end anode, and silicon controlled negative electrode is connected with positive direct-current bus, and the described control end controlling switch is that silicon controlled controls pole.
Preferably, described switching switch is relay, the common port that common port is relay of switching switch, the normally-closed contact that the first end is relay of switching switch, the normally opened contact that the second end is relay of switching switch. Such structure ensure that original state is to trigger branch road to be linked into main circuit of converter and switch not as the control of rectification unit, effectively prevent because of time initial as rectification unit control switch the situation accessing main circuit of converter and cause shielding failure.
The beneficial effects of the present invention is: when converter bus has short circuit phenomenon; pre-charge process just can disconnect the connection of power supply; converter is protected; it is prevented effectively from the situation that because of the generation of electric arc, originally intact device or pcb board are produced secondary damage, thus being preferably minimized the downtime of equipment.
Accompanying drawing explanation
Fig. 1 is the main circuit of converter schematic diagram of prior art.
Fig. 2 is the main circuit structure schematic diagram of the first preferred embodiment of the present invention.
Fig. 3 is the main circuit structure schematic diagram of the second preferred embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing and specific embodiment, the present invention is described in further detail.
Fig. 2 show the first preferred embodiment of the present invention, is the situation being applied to three-phase alternating current converter. The present embodiment includes main circuit and for main circuit provides the control circuit (not shown go out) of control signal, wherein, described main circuit is as shown in Figure 2, including power end 1, brake unit 3, filter unit 5, inversion unit 6 and precharge protection DC output unit 2, the input of precharge protection DC output unit 2 is connected with power end 1, and the outfan of precharge protection DC output unit 2 is respectively equipped with positive direct-current bus DC+ and negative dc bus DC-; Described precharge protection DC output unit 2 include between anode and the positive direct-current bus DC+ being connected to power end 1 for forward conduction and the forward protection branch road that can disconnect because crossing stream fusing, and be connected to the reverse branch road for reversely ending between the anode of power end 1 and negative dc bus DC-; Brake unit 3, filter unit 5 and inversion unit 6 are all connected between positive direct-current bus DC+ and negative dc bus DC-.
Wherein, described power end 1 is three-phase alternating current power end, and the quantity of the anode of power end 1 is three, respectively anode L1, anode L2 and anode L3. A forward protection branch road it is respectively connected with between each anode and positive direct-current bus DC+, specifically, to protect branch road with the anode L1 forward being connected, this forward protection branch road includes controllable silicon D1, fuse F1, charging resistor R1, the first diode D11 and relay K 1; The anode of controllable silicon D1 is connected with anode L1, and the negative electrode of controllable silicon D1 is connected with positive supply bus DC+; The anode of the first diode D11 is connected in series to anode L1 by charging resistor R1's and fuse F1, the negative electrode of the first diode D11 is connected with the common port of relay K 1, the normally-closed contact of relay K 1 is connected to the negative electrode of controllable silicon D1, and the normally opened contact of relay K 1 is connected to the control pole of controllable silicon D1; Similarly, protecting branch road to include controllable silicon D2, fuse F2, charging resistor R2, the first diode D12 and relay K 2 with the anode L2 forward being connected, connected mode is same as described above; Protecting branch road to include controllable silicon D3, fuse F3, charging resistor R3, the first diode D13 and relay K 3 with the anode L3 forward being connected, connected mode is same as described above; It is respectively connected with a reverse branch road between anode and the negative dc bus DC-of each power end 1; Specifically, for the reverse branch road being connected with anode L1, this reverse branch road includes the second diode D4, and the anode of this second diode D4 is connected with negative dc bus DC-, and the negative electrode of the second diode D4 is connected with anode L1; Similarly, the reverse branch road being connected with anode L2 is the second diode D5, and the reverse branch road being connected with anode L3 is the second diode D6, and connected mode is same as described above.
The IGBT module V7 in brake unit 3 in the present embodiment, electric capacity C1 in filter unit 5 and electric capacity C2, IGBT module V1 in inversion unit 6, IGBT module V2, IGBT module V3, IGBT module V4, IGBT module V5, the concrete on-link mode (OLM) of IGBT module V6 etc. all adopts and well known to a person skilled in the art that structure realizes, due to brake unit 3, filter unit 5 and inversion unit 6 are not the technological improvement point of the present invention, do not solve the technical problem to be solved, as space is limited, no longer to brake unit 3 in the present embodiment, filter unit 5 and inversion unit 6 are described in detail. above three functional unit can also adopt other different structures, only need to realize original required function in inverter. a series of electric capacity, resistor network are required over for actually used middle alternating current power supply just can connect to converter main circuit and be powered, in the present invention, the anode L1 of indication, anode L2 and anode L3 refer both to the node being directly connected with converter main circuit, in three-phase alternating current situation, the known general knowledge that connected mode is those skilled in the art of the negative terminal of power end 1 (not shown go out) and converter main circuit, the present embodiment also repeats no more. additionally, controllable silicon D1 to controllable silicon D3 as can forward conduction control switch, it is possible to adopt other controlled switching element with orientation connecting of breakover element realize, for instance catalyst and Diode series, it is possible to select other elements. first diode D11 to first diode D13 is as can a portion triggering branch road of forward conduction, it is possible to adopt components and parts of other common directed conductings to replace.
It it is the second preferred embodiment of the present invention shown in Fig. 3, it it is the situation being applied to direct-flow inverter, as shown in Figure 3, the present embodiment and the first embodiment above-mentioned are distinctive in that: power end 11 is DC power supply terminal, the anode of described power end 11 is positive supply V+, and power end 11 negative terminal is negative supply V-; Forward protection branch road between positive supply V+ and positive supply bus DC+ includes controllable silicon D7, fuse F4, charging resistor R4, the 3rd diode D14 and relay K 4; The anode of controllable silicon D7 is connected with positive supply V+, and the negative electrode of controllable silicon D7 is connected with positive supply bus DC+; The anode of the 3rd diode D14 is connected in series to positive supply V+ by charging resistor R4's and fuse F4, the negative electrode of the 3rd diode D14 is connected with the common port of relay K 4, the normally-closed contact of relay K 4 is connected to the negative electrode of controllable silicon D7, and the normally opened contact of relay K 4 is connected to the control pole of controllable silicon D7; Described reverse branch road is open circuit, is namely not connected to any components and parts between positive supply V+ and negative dc bus DC-, and power end 11 is as DC source, thus the reverse cut-off that can realize between positive supply V+ and negative dc bus DC-of only need to opening a way; Negative supply V-is connected with negative dc bus DC-. Due to direct current supply, as can the controllable silicon D7 that control switch of forward conduction, can directly adopt other controlled switching element to replace, for instance catalyst.
Work process: when powering on, relay K 1 to relay K 3(or relay K 4) beat at normally-closed contact, power end 1(or power end 11) by as the first diode D11 to the first diode D13(or the 3rd diode D14 triggering branch road) it is connected to positive supply bus DC+, electric capacity C1, electric capacity C2 is made to charge, controllable silicon D1 to controllable silicon D3(or controllable silicon D7) then complete and converter main circuit is completely isolated, rectifier cell (the direct current supply situation for the second embodiment when first diode D11 to first diode D13 is simultaneously as precharge, due to without rectification, circuit can not use the 3rd diode D14, but the 3rd diode D14 can prevent the situation damaging converter because of reverse power connection from occurring), when the voltage of positive supply bus DC+ is raised to certain value, control circuit makes relay K 1 to relay K 3(or relay K 4) beat at normally opened contact, controllable silicon D1 to controllable silicon D3(or controllable silicon D7) turned on by forward bias, main circuit of converter normal operation, said process completes common pre-charge process. if power on, there is short-circuit conditions, in the moment powered on, owing to electric current is excessive, fuse F1 to fuse F3(or fuse F4) blow, power end 1(or power end 11) and the first diode D11 to first diode D13(or the 3rd diode D14) disconnect, controllable silicon D1 to controllable silicon D3(or controllable silicon D7) will not be biased, thus keeping cut-off state, realize precharge defencive function, and to energising moment to disconnection time, only have as triggering branch road the first diode D11 to first diode D13(or the 3rd diode D14) etc. element bear short circuit current, and controllable silicon D1 to controllable silicon D3(or controllable silicon D7) entirely without impacted. in addition it is also possible to directly fuse is connected between rectifier cell and positive direct-current bus, protects branch road as forward, also have fuse protection function, but rectifier cell can be subject to short-circuit current rush to a certain extent.
It should be noted that; above two embodiment is only the better embodiment of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention; any amendment of being made, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (1)
1. having the converter of precharge defencive function, including main circuit with for main circuit provides the control circuit of control signal, described main circuit includes power end, brake unit, filter unit and inversion unit; It is characterized in that: also including precharge protection DC output unit, the input of precharge protection DC output unit is connected with power end, and the outfan of precharge protection DC output unit is respectively equipped with positive direct-current bus and negative dc bus; Described precharge protection DC output unit include being connected between power end anode and positive direct-current bus for forward conduction and the forward protection branch road that can disconnect because crossing stream fusing, and be connected to the reverse branch road for reversely ending between power end anode and negative dc bus; Brake unit, filter unit and inversion unit are all connected between positive direct-current bus and negative dc bus; Described forward protection branch road include switching switch, fuse, can forward conduction control switch and energy forward conduction triggering branch road; Control switch and be connected across between power end anode and positive direct-current bus; The common port of switching switch by fuse with trigger branch road be connected in series to power end anode, the first end of switching switch is connected to positive direct-current bus, and the second end of switching switch is connected to the control end controlling switch;
Described power end is three-phase alternating current power end, the quantity of power end anode is three, it is respectively connected with a forward protection branch road between each power end anode and positive direct-current bus, and between each power end anode and negative dc bus, is respectively connected with a reverse branch road; The triggering branch road of each described forward protection branch road includes charging resistor and the first diode, the negative electrode of the first diode is connected with the common port of switching switch, and what the anode of the first diode passed through charging resistor and fuse is connected in series to corresponding power end anode; Each described reverse branch road includes the second diode, and the anode of the second diode is connected with negative dc bus, and the negative electrode of the second diode connects with corresponding power end anode; Or described power end is DC power supply terminal, described power end anode is positive supply, and power end negative terminal is negative supply; The triggering branch road of described forward protection branch road includes charging resistor; Described reverse branch road is open circuit; Negative supply is connected with negative dc bus;
The described switch that controls is controllable silicon, and silicon controlled anode is connected with power end anode, and silicon controlled negative electrode is connected with positive direct-current bus, and the described control end controlling switch is that silicon controlled controls pole; Described switching switch is relay, the common port that common port is relay of switching switch, the normally-closed contact that the first end is relay of switching switch, the normally opened contact that the second end is relay of switching switch.
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| KR101611010B1 (en) * | 2013-11-19 | 2016-04-08 | 엘에스산전 주식회사 | Pre-charging circuit of inverter |
| CN103746573A (en) * | 2014-01-13 | 2014-04-23 | 上海新时达电气股份有限公司 | Rectification device |
| CN104348367A (en) * | 2014-11-04 | 2015-02-11 | 南车株洲电力机车研究所有限公司 | Auxiliary converter module |
| CN104578746A (en) * | 2014-12-31 | 2015-04-29 | 山东艾磁驱动科技有限公司 | Electrolytic capacitor precharging circuit |
| CN106992690A (en) * | 2017-04-14 | 2017-07-28 | 深圳易能电气技术股份有限公司 | Main circuit of frequency converter circuit |
| CN109390914B (en) * | 2017-08-03 | 2020-03-27 | 乐星产电(无锡)有限公司 | Protection method and device for charging circuit of frequency converter |
| WO2019051718A1 (en) * | 2017-09-14 | 2019-03-21 | 西门子公司 | Frequency converter, frequency converter assembly, and control method thereof |
| CN108008235B (en) * | 2017-11-17 | 2021-02-26 | 珠海格力电器股份有限公司 | Direct current bus short circuit detection method, device and detection circuit |
| EP3490128B1 (en) * | 2017-11-28 | 2019-11-20 | KEB Automation KG | Electronic protection circuit |
| EP3490129B1 (en) * | 2017-11-28 | 2020-01-08 | KEB Automation KG | Electronic protection circuit |
| DE102018203489B4 (en) * | 2018-03-08 | 2022-05-19 | Vitesco Technologies GmbH | AC charging device for a motor vehicle and method for operating an AC charging device for a motor vehicle |
| CN112134339A (en) * | 2019-06-24 | 2020-12-25 | 光宝电子(广州)有限公司 | Power conversion device, capacitor short-circuit protection circuit thereof and capacitor short-circuit protection method |
| CN110429644B (en) * | 2019-07-31 | 2021-08-20 | 华为技术有限公司 | Inverter and power supply system |
| CN112234584A (en) * | 2020-09-17 | 2021-01-15 | 邯郸钢铁集团有限责任公司 | Improved voltage type frequency converter brake circuit protection method |
| CN113471949B (en) * | 2021-07-05 | 2023-08-25 | 四川航天烽火伺服控制技术有限公司 | Capacitor charge-discharge circuit and electromechanical servo system |
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Effective date of registration: 20230417 Address after: B5-3, No.16 Mupi West Street, Xintang Street, Tianhe District, Guangzhou, Guangdong, 510000 Patentee after: Guangzhou Yuewei Electric Co.,Ltd. Address before: 510000 Building A911, Guangzhou International Business Incubator, Science City, Guangzhou High tech Industrial Development Zone, Guangzhou, Guangdong Province Patentee before: Guangzhou Weidali Electrical Appliance Co.,Ltd. |