Two-way on-board charger insulation detection circuit and detection method thereof

An on-board charger and detection circuit technology, which is applied to test circuits, high resistance measurement, and resistance/reactance/impedance measurement, etc., can solve problems such as cumbersome operations, inability to monitor in real time, etc., achieves a simple and practical structure, and eliminates electric shocks. hidden effect

Active Publication Date: 2019-03-01
SHENZHEN VMAX NEW ENERGY CO LTD
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  • Claims
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Problems solved by technology

Has the defect of cumbersome operation and cannot be monitored in real time

Method used

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  • Two-way on-board charger insulation detection circuit and detection method thereof
  • Two-way on-board charger insulation detection circuit and detection method thereof
  • Two-way on-board charger insulation detection circuit and detection method thereof

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] When the on-board charger works in the inverter state, due to the requirements of the forward OBC on EMI, the output live wire L and the output neutral wire N on the AC output port have Y capacitors to the ground wire during the inverter, and the output live wire L and the output zero wire The capacitance value of the Y capacitor of the line N to the ground is equal. The existence of the Y capacitor makes the output live line L and the output neutral line N have voltages to the ground respectively, and the phase is 180° out of phase; the amplitude of the voltage is the same as that of the ...

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Abstract

The invention discloses a two-way on-board charger insulation detection circuit and a detection method thereof. The detection circuit comprises an inverter circuit, a first Y capacitor (C1) connectedbetween an output firing line and a ground line of the inverter circuit, a second Y capacitor (C2) connected between an output zero line and the ground line of the inverter circuit, and further includes a firing line sampling circuit and a zero line sampling circuit correspondingly connected with the output firing line and the output zero line of the inverter circuit, and a controller connected with the firing line sampling circuit and the zero line sampling circuit. The firing line sampling circuit and the zero line sampling circuit respectively output sampling voltage. The controller determines a two-way on-board charger insulation state according to the two sampling voltage. When an on-board charger works in an inverter mode, values of ground insulation impedance of the output firing line L and the output zero line N are detected, and whether insulation failure exists between AC output of a pure inverter mode and a vehicle body is determined, so as to eliminate electric shock hazardof personnel. The circuit has advantages of simple and practical structure, easy implementation and low cost.

Description

technical field [0001] The invention relates to charging equipment, in particular to a bidirectional vehicle charger insulation detection circuit and a detection method thereof. Background technique [0002] The energy crisis and environmental pollution have become increasingly serious around the world, and the entire traditional automobile industry and the world's objective environment are facing severe challenges. With the strengthening of public awareness of environmental protection, advocating green travel and changing the travel structure has become the mainstream. Along with the development plan of the governments of developed countries to develop new energy vehicles, our government has also announced the corresponding development plan of new energy vehicles, and new energy vehicles have also been included in the seven emerging strategic industries. Among new energy vehicles, electric vehicles are currently the most mainstream. The on-board charger is a very importan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/14G01R27/02
CPCG01R27/025G01R31/14
Inventor 刘钧冯颖盈徐金柱张远昭
Owner SHENZHEN VMAX NEW ENERGY CO LTD
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