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DC system insulating resistor monitoring circuit, system and method

An insulation resistance and monitoring circuit technology, applied in the field of electric vehicles, can solve the problems of increased DC system ripple, undetectable insulation resistance faults, and reduced equipment insulation performance, etc., to achieve the effect of improving detection accuracy

Pending Publication Date: 2017-12-01
JIANGMEN TIANDE ELECTRICAL APPLIANCE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Problems in the balanced bridge method: 1. The switches K1″ and K2″ are closed at the same time, and the parallel access resistance will reduce the insulation performance of the equipment, thus reducing the safety of personnel and equipment; 2. When the insulation resistance Rp and Rn are simultaneously When it is lowered, the insulation resistance fault cannot be detected; 3. It does not have the real-time monitoring function of insulation resistance
However, this method still has the following defects: the ripple of the DC system will increase, affecting the quality of power supply, and the distributed capacitance of the system will directly affect the measurement results, reducing the resolution

Method used

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  • DC system insulating resistor monitoring circuit, system and method
  • DC system insulating resistor monitoring circuit, system and method
  • DC system insulating resistor monitoring circuit, system and method

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Effect test

Embodiment 1

[0061] Firstly, the present invention provides a monitoring circuit for real-time monitoring of the insulation resistance of the DC system of the electric vehicle, so as to calculate the value of the insulation resistance of the DC system. The following specifically introduces the circuit composition of the monitoring circuit of the present invention, please refer to image 3 , which is a circuit diagram of the monitoring circuit of the present invention. The invention provides a DC system insulation resistance monitoring circuit, which includes: a voltage boosting circuit, a monitoring circuit and a voltage value sampling circuit.

[0062] The boost circuit includes a first booster T1 and a second booster T2.

[0063] The monitoring circuit includes a first relay contact S1, a second relay contact S2, a first diode D1, a second diode D2, a first resistor R1, a second resistor R2, a third resistor R3, The fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the ...

Embodiment 2

[0071] In combination with the monitoring circuit of Embodiment 1, the present invention also provides a monitoring system for the insulation resistance of the DC system of the electric vehicle. For details, please refer to Figure 4 , which is a connection block diagram of the monitoring system of the present invention. The present invention also provides a DC system insulation resistance monitoring system, which includes a battery pack device 1 , an insulation monitoring device 2 , an MCU processor 3 , a battery management system 4 and a vehicle controller 5 .

[0072] The insulation monitoring device 2 is used to monitor the insulation resistance of the battery pack device;

[0073] The MCU processor 3 is respectively connected to the battery management system and the insulation monitoring device for receiving instructions from the battery management system, and sending the resistance value of the insulation resistance monitored by the insulation monitoring device to the b...

Embodiment 3

[0084] see Figure 5 , which is a flowchart of the steps of the monitoring method of the present invention. Based on the DC system insulation resistance monitoring system in Embodiment 2, the present invention also provides a monitoring method using the above DC system insulation resistance monitoring system, including the following steps:

[0085] Step S1: Receive the monitoring command, close the relays S1 and S2, the MCU does not give the PWM signal, and the boost circuit does not work;

[0086] Step S2: Sampling the voltages of the third resistor R3 and the fifth resistor R5, and calculating the voltages U+, U- on the insulation resistance of the positive and negative busbars of the DC system to the ground and the total voltage of the DC system U=U++U-, then The voltage division ratio of the total voltage of the DC bus divided by the insulation resistance of the positive and negative bus to the ground is N=U- / U+=Rn / Rp.

[0087] S3: When Rn>Rp, and U, U+ and U- are within...

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Abstract

The invention provides a DC system insulating resistor monitoring circuit which includes: a boosted circuit, a monitoring circuit and a voltage value sampling circuit. The boosted circuit includes a first voltage booster T1 and a second voltage booster T2 and is intended for injecting PWM waves for the monitoring circuit. The voltage sampling circuit is intended for sampling the voltage of the monitoring circuit so as to compute the magnitude of an insulating circuit in the DC system. Compared with prior art technologies, according to the invention, the monitoring circuit herein increases detection accuracy by injecting DC signals. Further, according to the invention, the monitoring circuit herein can real-time monitor the malfunction of the positive and negative insulating resistors and does not affect the quality of power supply.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a DC system insulation resistance monitoring circuit; the invention also relates to a monitoring system and a monitoring method using the circuit. Background technique [0002] The voltage of the battery pack of an electric vehicle is generally around 300V, and the environment in which the electric vehicle is used is relatively harsh. , motor controller, motor, car charger and other components) and the car body are prone to damage and destruction, which reduces the insulation performance. The positive and negative leads of the power supply form a leakage current loop through the insulating layer and the chassis, which increases the potential of the chassis , will not only endanger the personal safety of passengers, but also affect the normal operation of electrical appliances in the vehicle. Accurate and real-time detection of high-voltage electrical systems is of great significa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02
CPCG01R27/025
Inventor 刘群梁树明张伟森柏伟杰黄浩许兴发
Owner JIANGMEN TIANDE ELECTRICAL APPLIANCE CO LTD
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