A detection circuit for insulation resistance
A technology of insulation resistance and detection circuit, applied in the direction of measuring resistance/reactance/impedance, measuring device, measuring electrical variables, etc., can solve the problems of decreased detection accuracy, inability to overcome common mode interference, etc., to improve safety and accuracy Effect
Active Publication Date: 2017-08-25
BYD CO LTD
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But the biggest disadvantage is that it cannot overcome the parasitic capacitance on the whole vehicle and the common-mode interference between the high voltage of the battery pack and the body ground after the motor controller works, which leads to a decrease in detection accuracy and affects the detection results.
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[0015] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0016] In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than Nothing indicating or implying that a referenced device or elem...
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The present invention proposes a detection circuit for insulation resistance, including: a DC / DC power supply module; a DC / DC steering module, which has a first terminal and a second terminal, the first terminal is connected to the positive pole or negative pole of the high-voltage bus through a first switch, The second end is grounded through the first resistor to adjust the current flow direction; the power sampling module collects the first voltage and the second voltage in different directions of the current flowing through the DC / DC steering module after the first switch is switched to the positive end of the high-voltage bus; the current The sampling module collects the first current and the second current flowing through the DC / DC steering module in different directions after the first switch is switched to the positive terminal of the high-voltage bus; the controller, according to the first and second voltages, the first and the second The second current obtains the insulation resistance between the positive pole of the high-voltage busbar and the ground. The invention can collect the insulation resistance of the high-voltage busbar to the ground, has the advantages of eliminating the interference from the whole vehicle and the influence of parasitic capacitance, and improves the safety of the whole vehicle.
Description
technical field [0001] The invention relates to the technical field of automobile manufacturing, in particular to a detection circuit for insulation resistance. Background technique [0002] At present, there are two technologies for testing insulation resistance: one is the AC detection method, and the other is the DC detection method. The advantage of the AC detection method is that no high voltage is introduced into low voltage equipment, and the detection speed is very fast. But the biggest disadvantage is that it cannot overcome the parasitic capacitance on the vehicle and the common-mode interference generated between the high voltage of the battery pack and the body ground after the motor controller works, which leads to a decrease in detection accuracy and affects the detection results. Contents of the invention [0003] The present invention aims to solve at least the technical problems existing in the prior art. [0004] For this reason, the object of the prese...
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IPC IPC(8): G01R27/04
Inventor 黎贝于海军汤小华
Owner BYD CO LTD