CN103956297A - Large current contactor control circuit of low-speed electric vehicle - Google Patents
Large current contactor control circuit of low-speed electric vehicle Download PDFInfo
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- CN103956297A CN103956297A CN201410181158.3A CN201410181158A CN103956297A CN 103956297 A CN103956297 A CN 103956297A CN 201410181158 A CN201410181158 A CN 201410181158A CN 103956297 A CN103956297 A CN 103956297A
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Abstract
Te invention provides a large current contactor control circuit of a low-speed electric vehicle. The large current contactor control circuit of the low-speed electric vehicle comprises a power-on buffer contactor, a contactor control unit, a voltage sampling unit, a contactor power loop and a motor controller. The contactor control unit is used for closing the power-on buffer contactor and the large current contactor according to a control instruction of the motor controller; the voltage sampling unit is used for sampling voltages of a first sampling point and a second sampling point located on the two sides of a contact end of the large current contactor respectively; the motor controller is used for generating a control instruction for closing the power-on buffer contactor according to an instruction of a whole vehicle controller, and generating a control instruction for closing the large current contactor when the voltage difference of the first sampling point and the second sampling point is less than a set voltage difference value. By means of the large current contactor control circuit of the low-speed electric vehicle, through simultaneous detection of the voltage across the two sides of the contact end of the large current contactor, closed-loop control of the large current contactor is achieved and reliability of the product is improved.
Description
Technical field
The present invention relates to electric machine controller field, more particularly, relate to the large contactor control circuit of a kind of low-speed electronic car.
Background technology
In most domestic low-speed electronic car, the large contactor of electric machine controller all adopts open loop to control at present.The common control mode of these electric machine controllers is: the closure buffering contactor that powers on after high-pressure system powers on, and after time delay certain hour closed large contactor.
Yet, above-mentioned electric machine controller is open loop control mode in the process of control contactor closure, after the buffer loop that powers on lost efficacy, still can carry out the instruction of closed large contactor, and because load is large bulk capacitance, when power on buffer circuit inefficacy and large contactor are closed, by causing large contactor to bear compared with large impulse current, there is contactor adhesion, large contactor was lost efficacy.Therefore, in existing electric machine controller, the mode reliability of open loop control contactor is low, and the risk that large contactor adhesion was lost efficacy is larger.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned electric machine controller problem that easy outlet contactor adhesion was lost efficacy when controlling large contactor closure, provides a kind of low-speed electronic car large contactor control circuit.
The technical scheme that the present invention solves the problems of the technologies described above is, provide a kind of low-speed electronic car large contactor control circuit, comprise power on buffering contactor, contactor control unit, voltage sampling unit, contactor loop of power circuit and electric machine controller, wherein: described contactor control unit, for buffering contactor and the large contactor of powering on according to the control command closure of electric machine controller; Described voltage sampling unit, for sampling, lay respectively at large contactor tip side the first sampled point of both sides and the voltage of the second sampled point and the magnitude of voltage of sampling is sent to electric machine controller; Described contactor loop of power circuit comprise and power on buffering contactor tip side be connected in series in the buffer resistance between the first sampled point and the second sampled point and be connected in the second sampled point and negative DC bus between dc-link capacitance; Described electric machine controller, for generating the control command of the buffering contactor closure that makes to power on and generate the control command that makes large contactor closure when the voltage difference of the first sampled point and the second sampled point being less than the pressure difference of setting according to the instruction of entire car controller.
In the large contactor control circuit of low-speed electronic car of the present invention, described contactor control unit comprises the first switch element, second switch element, wherein: the coil-end of large contactor and described the first switch element is connected in series in high level and with reference between ground; The coil-end of the buffering that powers on contactor and described second switch element is connected in series in high level and with reference between ground; The control end of described the first switch element and second switch element is connected respectively to the control signal output of electric machine controller.
In the large contactor control circuit of low-speed electronic car of the present invention, described contactor control unit also comprises the first diode and the second diode, and described the first diode is connected in parallel with the coil-end of the buffering contactor that powers on and the negative electrode of this first diode is connected high level; Described the second diode is connected in parallel with the coil-end of large contactor and the negative electrode of this second diode is connected high level.
In the large contactor control circuit of low-speed electronic car of the present invention, described voltage sampling unit comprises the first sampling subelement and the second sampling subelement, be used for sampling between the first sampled point and negative DC bus voltage output to electric machine controller of the first sampling subelement wherein, second samples be used for sampling between the second sampled point and negative DC bus voltage output to electric machine controller of subelement.
In the large contactor control circuit of low-speed electronic car of the present invention, described the first sampling subelement comprises the first operational amplifier, and the positive input terminal of this first operational amplifier via resistance be connected to the first sampled point, negative input end via resistance be connected to negative DC bus, output is connected to electric machine controller.
In the large contactor control circuit of low-speed electronic car of the present invention, the positive input terminal of described the first operational amplifier is provided with and between RC filter circuit, negative input end and output, is connected in parallel to a resistance and an electric capacity.
In the large contactor control circuit of low-speed electronic car of the present invention, described the second sampling subelement comprises the second operational amplifier, and the positive input terminal of this second operational amplifier via resistance be connected to the second sampled point, negative input end via resistance be connected to negative DC bus, output is connected to electric machine controller.
In the large contactor control circuit of low-speed electronic car of the present invention, the positive input terminal of described the second operational amplifier is provided with and between RC filter circuit, negative input end and output, is connected in parallel to a resistance and an electric capacity.
The large contactor control circuit of low-speed electronic car of the present invention, by detect the voltage of large contactor tip side both sides simultaneously, realize the closed-loop control of large contactor, can realize and effectively avoid large contactor because the pressure reduction compared with high produces impulse current, to occur the risk of contacts of contactor adhesion under compared with large capacitive load operating mode, thereby improve reliability.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the large contactor control circuit of low-speed electronic car of the present invention embodiment.
Fig. 2 is the power on circuit diagram of buffering contactor, large contactor, contactor control unit and contactor loop of power circuit of the schematic diagram in Fig. 1.
Fig. 3 is the circuit diagram of the first sampling subelement.
Fig. 4 is the circuit diagram of the second sampling subelement.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, be the schematic diagram of the large contactor control circuit of low-speed electronic car of the present invention embodiment, it is for realizing the Closed control of the large contactor of low-speed electronic car.Large contactor control circuit in the present embodiment comprises power on buffering contactor 12, contactor control unit 13, voltage sampling unit 15, contactor loop of power circuit 14 and electric machine controller 16, the tip side of the buffering that wherein powers on contactor 12 is serially connected on positive direct-current bus, and the tip side of large contactor 11 is connected in parallel with the tip side of the buffering contactor 12 that powers on; Contactor control unit 13 is for buffering contactor 12 and the large contactor 11 of powering on according to the control command closure of electric machine controller, and it is specifically by making the coil-end energising of corresponding contactor realize the closure of contactor; Voltage sampling unit 15 for sampling, lay respectively at large contactor 11 tip side the first sampled point of both sides and the voltage of the second sampled point and the magnitude of voltage of sampling is sent to electric machine controller 16; Contactor loop of power circuit 14 comprise and power on buffering contactor 12 tip side be connected in series in the buffer resistance between the first sampled point and the second sampled point and be connected in the second sampled point and negative DC bus between dc-link capacitance; Electric machine controller 16 is for generating the control command of the buffering contactor closure that makes to power on and generate the control command that makes large contactor closure when the voltage difference of the first sampled point and the second sampled point being less than the pressure difference of setting according to the instruction of entire car controller.
The large contactor control circuit of above-mentioned low-speed electronic car is by the pressure differential detection to the tip side both sides of large contactor, can effectively avoid large contactor high pressure reduction under compared with large capacitive load operating mode to produce impulse current, and occur the risk of contacts of contactor adhesion.
As shown in Figure 2, be in Fig. 1, to power on to cushion the circuit diagram of contactor 12, large contactor 11, contactor control unit 13, contactor loop of power circuit 14.Above-mentioned contactor control unit 13 comprises the first switch element Q1, second switch element Q2, and wherein the coil-end of large contactor 11 and second switch element Q2 are connected in series between high level VCC and reference ground GND; The coil-end of the buffering that powers on contactor 12 and the first switch element Q1 are connected in series between high level VCC and reference ground GND; And the control end of the first switch element Q1 and second switch element Q2 is connected to respectively the control signal output of electric machine controller 16 via resistance R 2, a R3.Like this, can, by the control end input high level to the first switch element Q1 and second switch element Q2, make corresponding contactor coil conducting, thereby make the closing of contact of corresponding contactor.Above-mentioned the first switch element Q1 and second switch element Q2 specifically can adopt triode or switching tube etc.
In addition, above-mentioned contactor control unit 13 also can comprise the first diode D1 and the second diode D2, and wherein the first diode D1 is connected in parallel and the negative electrode of this first diode D1 is connected high level VCC with the coil-end of the buffering contactor 12 that powers on; The second diode D2 is connected in parallel with the coil-end of large contactor 11 and the negative electrode of this second diode D2 is connected high level VCC.
Contactor loop of power circuit 14 comprises buffer resistance R1 and dc-link capacitance C1, and when the tip side K1 conducting of the buffering contactor 12 that powers on, dc-link capacitance C1, via buffer resistance R1 charging, raises the voltage of the second sampled point P gradually.
Voltage sampling unit 15 comprises the first sampling subelement and the second sampling subelement, be used for sampling between the first sampled point P1 and negative DC bus N voltage output to electric machine controller 16, the second and sample be used for sampling between the second sampled point P and negative DC bus N voltage output to electric machine controller 16 of subelements of the first sampling subelement wherein.
As shown in Figure 3, the first sampling subelement comprises the first operational amplifier U1-B, and the positive input terminal of this first operational amplifier U1-B via resistance R 9 be connected to the first sampled point P1, negative input end via resistance R 8 be connected to negative DC bus N, output is connected to electric machine controller 16.Especially, the positive input terminal of above-mentioned the first operational amplifier U1-B is provided with and between RC filter circuit, negative input end and the output consisting of resistance R 10 and capacitor C 3, is connected in parallel to a resistance C5 and an electric capacity R11.
As shown in Figure 4, the second sampling subelement comprises the second operational amplifier U1-A, and the positive input terminal of this second operational amplifier U1-A via resistance R 5 be connected to the second sampled point P, negative input end via resistance R 4 be connected to negative DC bus N, output is connected to electric machine controller 16.Especially, the positive input terminal of above-mentioned the second operational amplifier U1-A is provided with and between RC filter circuit, negative input end and the output consisting of resistance R 6 and capacitor C 4, is connected in parallel to a resistance C6 and an electric capacity R7.
Electric machine controller 16 can adopt a micro-control unit (MCU), in it, preserve the pressure difference of a setting, when the difference of the voltage of the first sampling subelement and the second sampling subelement sampling is less than the pressure difference of setting for example, to second switch element Q2 output control signal (high level), make the tip side K4 of large contactor closed, realize the Closed control of large contactor.
The large contactor control circuit of above-mentioned low-speed electronic car (when adopt as Fig. 2-4 circuit time) operation principle is as follows: when high-pressure system powers on after (direct current bus bar), the closure that electric machine controller 16 response entire car controllers send powers on and cushions the instruction of contactor, it is high level that electric machine controller 16 sends DO1 signal, the first switch element Q1 conducting, the tip side K1 of the buffering that powers on contactor is closed.Now the voltage at the first sampled point P1, negative DC bus N two ends is high-tension battery voltage, and by buffer resistance R1, to dc-link capacitance C1, charges between the second sampled point P, negative DC bus N, and the voltage at dc-link capacitance C1 two ends slowly rises.The first sampling subelement and the second sampling subelement be real-time sampling the first sampled point P1 respectively, voltage and the second sampled point P between negative DC bus N, voltage between negative DC bus N also sends to electric machine controller 16, when the voltage difference of sampling by electric machine controller 16 judgement the first sampling subelements and the second sampling subelement is less than the pressure difference of setting, sending DO2 signal is high level, make second switch element Q2 conducting, the tip side K4 adhesive of large contactor, thereby effectively avoided large contactor, because producing greater impact electric current under large differential pressure conditions, capacitive load there is the risk of contacts of contactor adhesion.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (8)
1. the large contactor control circuit of low-speed electronic car, comprise the buffering contactor that powers on, it is characterized in that: this control circuit also comprises contactor control unit, voltage sampling unit, contactor loop of power circuit and electric machine controller, wherein: described contactor control unit, for buffering contactor and the large contactor of powering on according to the control command closure of electric machine controller; Described voltage sampling unit, for sampling, lay respectively at large contactor tip side the first sampled point of both sides and the voltage of the second sampled point and the magnitude of voltage of sampling is sent to electric machine controller; Described contactor loop of power circuit comprise and power on buffering contactor tip side be connected in series in the buffer resistance between the first sampled point and the second sampled point and be connected in the second sampled point and negative DC bus between dc-link capacitance; Described electric machine controller, for generating the control command of the buffering contactor closure that makes to power on and generate the control command that makes large contactor closure when the voltage difference of the first sampled point and the second sampled point being less than the pressure difference of setting according to the instruction of entire car controller.
2. the large contactor control circuit of low-speed electronic car according to claim 1, it is characterized in that: described contactor control unit comprises the first switch element, second switch element, wherein: the coil-end of large contactor and described the first switch element is connected in series in high level and with reference between ground; The coil-end of the buffering that powers on contactor and described second switch element is connected in series in high level and with reference between ground; The control end of described the first switch element and second switch element is connected respectively to the control signal output of electric machine controller.
3. the large contactor control circuit of low-speed electronic car according to claim 2, it is characterized in that: described contactor control unit also comprises the first diode and the second diode, described the first diode is connected in parallel with the coil-end of the buffering contactor that powers on and the negative electrode of this first diode is connected high level; Described the second diode is connected in parallel with the coil-end of large contactor and the negative electrode of this second diode is connected high level.
4. the large contactor control circuit of low-speed electronic car according to claim 1, it is characterized in that: described voltage sampling unit comprises the first sampling subelement and the second sampling subelement, be used for sampling between the first sampled point and negative DC bus voltage output to electric machine controller of the first sampling subelement wherein, second samples be used for sampling between the second sampled point and negative DC bus voltage output to electric machine controller of subelement.
5. the large contactor control circuit of low-speed electronic car according to claim 4, it is characterized in that: described the first sampling subelement comprises the first operational amplifier, and the positive input terminal of this first operational amplifier via resistance be connected to the first sampled point, negative input end via resistance be connected to negative DC bus, output is connected to electric machine controller.
6. the large contactor control circuit of low-speed electronic car according to claim 5, is characterized in that: the positive input terminal of described the first operational amplifier is provided with and between RC filter circuit, negative input end and output, is connected in parallel to a resistance and an electric capacity.
7. the large contactor control circuit of low-speed electronic car according to claim 4, it is characterized in that: described the second sampling subelement comprises the second operational amplifier, and the positive input terminal of this second operational amplifier via resistance be connected to the second sampled point, negative input end via resistance be connected to negative DC bus, output is connected to electric machine controller.
8. the large contactor control circuit of low-speed electronic car according to claim 7, is characterized in that: the positive input terminal of described the second operational amplifier is provided with and between RC filter circuit, negative input end and output, is connected in parallel to a resistance and an electric capacity.
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| CN201410181158.3A CN103956297B (en) | 2014-04-30 | 2014-04-30 | The large contactor control circuit of low-speed electronic car |
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| CN201410181158.3A CN103956297B (en) | 2014-04-30 | 2014-04-30 | The large contactor control circuit of low-speed electronic car |
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| CN103956297B CN103956297B (en) | 2016-05-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109473311A (en) * | 2017-09-08 | 2019-03-15 | 湖南中车时代电动汽车股份有限公司 | A kind of high-voltage relay and high-voltage relay guard method |
| CN110620019A (en) * | 2018-06-20 | 2019-12-27 | 森萨塔科技（常州）有限公司 | Hybrid DC contactor and online diagnosis system thereof |
| CN111383860A (en) * | 2018-12-28 | 2020-07-07 | 北汽福田汽车股份有限公司 | Contactor control method and device and contactor |
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| CN111383860A (en) * | 2018-12-28 | 2020-07-07 | 北汽福田汽车股份有限公司 | Contactor control method and device and contactor |
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| CN103956297B (en) | 2016-05-25 |
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Effective date of registration: 20210514 Address after: 215000 52 tianedang Road, Yuexi, Wuzhong District, Suzhou City, Jiangsu Province Patentee after: SUZHOU HUICHUAN UNITED POWER SYSTEM Co.,Ltd. Address before: 518101 building e, Hongwei Industrial Zone, Liuxian 2nd Road, Baocheng 70 District, Bao'an District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN INOVANCE TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20230310 Address after: 213000 No. 296, Wuyi South Road, Wujin National High and New Technology Industry Development Zone, Changzhou City, Jiangsu Province Patentee after: Huichuan New Energy Automotive Technology (Changzhou) Co.,Ltd. Address before: 215000 52 tianedang Road, Yuexi, Wuzhong District, Suzhou City, Jiangsu Province Patentee before: SUZHOU HUICHUAN UNITED POWER SYSTEM Co.,Ltd. |