CN105353319A - Electric automobile pre-charging completion state detection apparatus based on passive isolation - Google Patents

Electric automobile pre-charging completion state detection apparatus based on passive isolation Download PDF

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Publication number
CN105353319A
CN105353319A CN201510840836.7A CN201510840836A CN105353319A CN 105353319 A CN105353319 A CN 105353319A CN 201510840836 A CN201510840836 A CN 201510840836A CN 105353319 A CN105353319 A CN 105353319A
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China
Prior art keywords
connected
diode
voltage
electric automobile
charging completion
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CN201510840836.7A
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Chinese (zh)
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CN105353319B (en
Inventor
袁建州
于丽娜
路高磊
付攀
刘洋
魏祯祁
娄世菊
陈艳艳
张晓林
阴晓慧
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郑州日产汽车有限公司
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Priority to CN201510840836.7A priority Critical patent/CN105353319B/en
Publication of CN105353319A publication Critical patent/CN105353319A/en
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Publication of CN105353319B publication Critical patent/CN105353319B/en

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Abstract

The invention discloses an electric automobile pre-charging completion state detection apparatus based on passive isolation. The electric automobile pre-charging completion state detection apparatus comprises a photocoupler, a positive electrode of a light emitting diode of the photocoupler is connected with a positive electrode of a voltage-stabilizing diode and a grid electrode of an NMOS transistor via a resistor, a negative electrode of the voltage-stabilizing diode is connected with a negative electrode of a diode, a positive electrode of the diode is connected with a first connector, a negative electrode of the photocoupler is connected with a drain electrode of the NMOS transistor, the grid electrode of the NMOS transistor is connected with an input terminal of a tree-terminal voltage-stabilizing tube, an output terminal of the three-terminal voltage-stabilizing tube is electrically connected with a second connector, a source electrode of the NMOS transistor is connected with an output terminal of the three-terminal voltage-stabilizing tube via the resistor, and an output terminal of a light interception triode of the photocoupler is used for being connected with a signal input terminal of a battery management system of an electric automobile. The electric automobile pre-charging completion state detection apparatus is advantageous in that the determination of the pre-charging completion state of the electric automobile is realized by employing a simple and effective circuit design, the cost is low, the maintenance is convenient, and the security and reliability of a vehicle distribution system can be effectively improved.

Description

Based on the electric vehicle pre-charging completion status pick-up unit of passive isolation

Technical field

The present invention relates to electric vehicle pre-charging completion status pick-up unit, especially relate to the electric vehicle pre-charging completion status pick-up unit based on passive isolation.

Background technology

The drive motor controller that electric automobile uses, DC/DC transducer, charging set, steer motor controller and air conditioner compressed machine controller etc.; the many employings of its hardware design add jumbo electric capacity at high input voltage unit and carry out energy storage filtering; therefore need to add pre-charge resistance in vehicle-mounted power distribution network; to alleviate the rush of current that powers on, reach protection drive motor controller object.In current electric automobile design, the judgement of precharge completion status takes the circuit be made up of DC/DC isolation module, operational amplifier, signal isolation module etc. to detect the voltage of vehicle-mounted high voltage power battery output more, and itself and on-board high-voltage electrokinetic cell total voltage are compared, if comparative result is greater than zero, assert that precharge completes, connect the positive contactor of master of on-board high-voltage electrokinetic cell precharge control loop, cut off precharge loop.Although this method is effective, the circuit design costs such as the DC/DC isolation module used, operational amplifier, signal isolation module are higher, and this circuit only uses when powering on, and causes the waste of resource.

Summary of the invention

The object of the invention is to provide a kind of electric vehicle pre-charging completion status pick-up unit based on passive isolation.

For achieving the above object, the present invention takes following technical proposals:

Electric vehicle pre-charging completion status pick-up unit based on passive isolation of the present invention, comprises photoelectrical coupler, the light emitting diode positive pole of described photoelectrical coupler and voltage stabilizing diode D zthe positive pole of 1 connects and passes through resistance R1 and is connected with the grid of high pressure NMOS pipe Q1; Described voltage stabilizing diode D zthe negative pole of 1 is connected with the negative pole of diode D1, and positive pole and first connector of described diode D1 are electrically connected; The light emitting diode negative pole of photoelectrical coupler is connected with the drain electrode of described high pressure NMOS pipe Q1, the grid of high pressure NMOS pipe Q1 and voltage stabilizing diode D zthe negative pole of 2 is connected with the input end of three-terminal voltage-stabilizing pipe, described voltage stabilizing diode D zthe positive pole of 2 and the output terminal of three-terminal voltage-stabilizing pipe and the second connector are electrically connected; The source electrode of high pressure NMOS pipe Q1 is connected with the output terminal of three-terminal voltage-stabilizing pipe by resistance R2; The illuminated triode output terminal of photoelectrical coupler is used for being connected with the battery management system signal input part of electric automobile.

The invention has the advantages that the judgement taking simple and effective circuit design to realize pure electric automobile precharge completion status; and with low cost, safeguard convenient; effectively raise the safe reliability of vehicle-mounted power distribution network, reach the power-on impact current, the protection drive motor controller object that reduce electric automobile.

Accompanying drawing explanation

Fig. 1 is circuit theory diagrams of the present invention.

Fig. 2 is the power brick of existing electric automobile and the circuit theory diagrams of high voltage distribution box.

Embodiment

As shown in Figure 1, the electric vehicle pre-charging completion status pick-up unit based on passive isolation of the present invention, comprises photoelectrical coupler 1, the light emitting diode positive pole of photoelectrical coupler 1 and voltage stabilizing diode D zthe positive pole of 1 connects and passes through resistance R1 and is connected with the grid of high pressure NMOS pipe Q1; Voltage stabilizing diode D zthe negative pole of 1 is connected with the negative pole of diode D1, and positive pole and first connector 3 of diode D1 are electrically connected; The light emitting diode negative pole of photoelectrical coupler 1 is connected with the drain electrode of described high pressure NMOS pipe Q1, the grid of high pressure NMOS pipe Q1 and voltage stabilizing diode D zthe negative pole of 2 is connected with the input end of three-terminal voltage-stabilizing pipe 2, voltage stabilizing diode D zthe positive pole of 2 and the output terminal of three-terminal voltage-stabilizing pipe 2 and the second connector 4 are electrically connected; The source electrode of high pressure NMOS pipe Q1 is connected with the output terminal of three-terminal voltage-stabilizing pipe 2 by resistance R2; The illuminated triode output terminal of photoelectrical coupler 1 is used for being connected with the battery management system signal input part of electric automobile.

Principle of work of the present invention is summarized as follows:

As shown in Figure 1, 2, during work, first the first connector 3, second connector 4 being electrically connected with A, B 2 in the power brick circuit 5 of electric automobile, respectively by the illuminated triode output terminal of photoelectrical coupler 1 and the BMS(battery management system of electric automobile) signal input part is connected.The contactor action of high voltage distribution box 6 inside of electric automobile is by VCU(entire car controller) directly control, the contactor of power brick inside is by BMS(battery management system) control.

When pre-charge resistance R2 both end voltage is higher than 20 volts, photoelectrical coupler 1 conducting, outputs signal to the BMS of electric automobile, for judging that on-board high-voltage electrokinetic cell E precharge does not complete.

When pre-charge resistance R2 both end voltage is lower than 20 volts, photoelectrical coupler 1 not conducting, does not have signal to export to the BMS of electric automobile, for judging that on-board high-voltage electrokinetic cell E precharge completes.

When pre-charge resistance R2 both end voltage is higher than 20 volts, flows through the current constant of photoelectrical coupler 1, equal the resistance of 2.5 volts/resistance R2.

When circuit of the present invention is by misconnection inverse time, diode D1 cut-off plays a protective role.By detecting the process being conducting to cut-off of photoelectrical coupler 1, can judge whether precharge completes on-board high-voltage electrokinetic cell E.Voltage stabilizing diode D z1 for regulating threshold voltage, voltage stabilizing diode D z2 for the protection of high pressure NMOS pipe Q1.

The flow process that specifically powers on is: VCU first controls the associated contact device of high voltage distribution box 6 inside and connects (contactor that K is drive motor contactor, K5 is compressor contactor, K6 is warm-air drier contactor, K7 is DC/DC, K8 are pre-charge contactor); Then normally opened contact j1, j2 of BMS control contactor K1, K2 close, and after BMS detects that the voltage of A, B point-to-point transmission is lower than 20 volts, the normally opened contact j3 of BMS control contactor K3 closes.Now, BMS sends pre-charge process completion status to VCU.

Claims (1)

1. based on an electric vehicle pre-charging completion status pick-up unit for passive isolation, it is characterized in that: comprise photoelectrical coupler (1), the light emitting diode positive pole of described photoelectrical coupler (1) and voltage stabilizing diode D zthe positive pole of 1 connects and passes through resistance R1 and is connected with the grid of high pressure NMOS pipe Q1; Described voltage stabilizing diode D zthe negative pole of 1 is connected with the negative pole of diode D1, and positive pole and first connector (3) of described diode D1 are electrically connected; The light emitting diode negative pole of photoelectrical coupler (1) is connected with the drain electrode of described high pressure NMOS pipe Q1, the grid of high pressure NMOS pipe Q1 and voltage stabilizing diode D zthe negative pole of 2 is connected with the input end of three-terminal voltage-stabilizing pipe (2), described voltage stabilizing diode D zthe positive pole of 2 and the output terminal of three-terminal voltage-stabilizing pipe (2) and the second connector (4) are electrically connected; The source electrode of high pressure NMOS pipe Q1 is connected with the output terminal of three-terminal voltage-stabilizing pipe (2) by resistance R2; The illuminated triode output terminal of photoelectrical coupler (1) is used for being connected with the battery management system signal input part of electric automobile.
CN201510840836.7A 2015-11-27 2015-11-27 Electric vehicle pre-charging completion status detection device based on passive isolation CN105353319B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510840836.7A CN105353319B (en) 2015-11-27 2015-11-27 Electric vehicle pre-charging completion status detection device based on passive isolation

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Application Number Priority Date Filing Date Title
CN201510840836.7A CN105353319B (en) 2015-11-27 2015-11-27 Electric vehicle pre-charging completion status detection device based on passive isolation

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CN105353319A true CN105353319A (en) 2016-02-24
CN105353319B CN105353319B (en) 2018-06-15

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1731207A (en) * 2005-08-25 2006-02-08 上海交通大学 Passive isolation accumulator voltage monitoring circuit
CN2935619Y (en) * 2006-04-25 2007-08-15 深圳市中传电气技术有限公司 Precharging circuit protection device of intelligent middle, high-voltage large power frequency converter
JP2008301612A (en) * 2007-05-31 2008-12-11 Sanyo Electric Co Ltd Power supply device for vehicle, and contactor welding detecting method for the same
CN201805353U (en) * 2010-08-30 2011-04-20 天津市松正电动科技有限公司 Pre-charged control circuit
CN202084968U (en) * 2011-06-20 2011-12-21 上海恒动汽车电池有限公司 Precharge circuit of power battery
CN203025235U (en) * 2012-11-21 2013-06-26 上海富欣智能交通控制有限公司 Voltage state detection circuit of output channel
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1731207A (en) * 2005-08-25 2006-02-08 上海交通大学 Passive isolation accumulator voltage monitoring circuit
CN2935619Y (en) * 2006-04-25 2007-08-15 深圳市中传电气技术有限公司 Precharging circuit protection device of intelligent middle, high-voltage large power frequency converter
JP2008301612A (en) * 2007-05-31 2008-12-11 Sanyo Electric Co Ltd Power supply device for vehicle, and contactor welding detecting method for the same
CN201805353U (en) * 2010-08-30 2011-04-20 天津市松正电动科技有限公司 Pre-charged control circuit
CN202084968U (en) * 2011-06-20 2011-12-21 上海恒动汽车电池有限公司 Precharge circuit of power battery
JP2013219955A (en) * 2012-04-10 2013-10-24 Hitachi Vehicle Energy Ltd Power supply device
CN203025235U (en) * 2012-11-21 2013-06-26 上海富欣智能交通控制有限公司 Voltage state detection circuit of output channel
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Address after: No. 181 Jianshe South Road, Zhongmou County, Zhengzhou City, Henan Province 450016

Patentee after: Zhengzhou Nissan Automotive Co., Ltd.

Address before: 450016 No. eighth, 369 East Road, Zhengzhou economic and Technological Development Zone, Henan, China

Patentee before: Zhengzhou Nissan Automotive Co., Ltd.