Alternating current insulation detection method and device
A detection method and insulation resistance technology, applied in the field of AC insulation detection methods and devices, can solve problems such as increased hardware cost, poor applicability, and inability to detect AC insulation resistance, and achieve the effect of reducing cost and improving applicability
Active Publication Date: 2022-07-29
宁波均胜新能源研究院有限公司
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Problems solved by technology
[0003] At present, the bridge balance method or signal injection method is often used for AC insulation detection through IMD (Insulation Monitoring Device, insulation detection device). When the insulation resistance of the live wire to ground and the insulation resistance of the AC neutral wire to ground are very small), the AC insulation resistance cannot be detected, and the applicability is poor; when the signal injection method is used for AC insulation detection, an additional DDS (Direct Digital Synthesis, direct frequency synthesis) high-frequency signal generation and amplification circuit, at the same time, in order to reduce the impact of the RC charging characteristics of the ground capacitance and parasitic capacitance on the detection accuracy, an additional resonant cavity circuit needs to be added, which increases the hardware cost
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[0069] In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. While certain embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for the purpose of A more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only used for exemplary purposes, and are not used to limit the protection scope of the present invention.
[0070] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. Furthermore, method embodiments may includ...
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The invention provides an alternating current insulation detection method and device, and the method comprises the steps: collecting a first voltage peak value outputted by a first impedance matching circuit when a first controlled switch is turned on and a second controlled switch is turned off; when the first controlled switch is turned off and the second controlled switch is turned on, collecting a second voltage peak value output by a second impedance matching circuit; when the first controlled switch and the second controlled switch are both turned on, a third voltage peak value output by the first impedance matching circuit and a fourth voltage peak value output by the second impedance matching circuit are collected; determining an AC voltage peak value according to the third voltage peak value, the fourth voltage peak value and a predetermined resistance value of a divider network resistor; and determining the AC insulation impedance according to the AC voltage peak value, the first voltage peak value, the second voltage peak value and the resistance value of the divider network resistor. According to the technical scheme, the applicability and accuracy of alternating current insulation detection are improved.
Description
technical field [0001] The present invention relates to the technical field of automotive power electronics, and in particular, to an AC insulation detection method and device. Background technique [0002] In order to avoid electric shock damage caused by electric vehicle insulation failure, GB7258-2017 motor vehicle safety technical conditions stipulates that the AC insulation resistance of pure electric and plug-in hybrid vehicle REESS (REchargeable Energy Storage System, rechargeable energy storage system) is lower than At 500Ω / V, the driver should be reminded by an obvious signal device. [0003] At present, IMD (Insulation Monitoring Device, insulation detection device) is often used for AC insulation detection by bridge balance method or signal injection method. If the insulation resistance of the live wire to the ground and the insulation resistance of the AC neutral wire to the ground are very small), the AC insulation resistance cannot be detected, and the applica...
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IPC IPC(8): G01R31/12G01R31/14G01R27/02
CPCG01R31/12G01R31/14G01R27/025Y04S10/52
Inventor 姜钊杜峰黄呈武陈岱岱李海威李鹏廖政伟杨铁利郭莎何文波
Owner 宁波均胜新能源研究院有限公司