Insulation detection apparatus for DC gas system
A technology of electrical systems and detection devices, which is applied in the electronic field, can solve problems such as insulation resistance errors, and achieve the effect of solving high precision requirements
Active Publication Date: 2015-08-26
湖北鸿飞电子科技有限公司
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Problems solved by technology
[0004] In the process of realizing the present invention, the inventors have found that the prior art has at least the following problems: the existing insulation detection mode has high requirements for the resistance used in the reference resistance network and the precision of the ADC, and when the precision of the resistance or the ADC changes with the working time, etc. When the factors change, it will lead to errors in the calculated insulation resistance value
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[0045] In order to facilitate the understanding of the technical solutions provided by the embodiments of the present invention, a DC electrical system is firstly introduced. figure 1 A direct current electrical system 100 is shown comprising a battery pack BAT, a load resistor RL1 or similar, and a load motor M. The load resistor RL1 is connected in parallel with the load motor M, and the positive and negative terminals of the battery pack BAT are electrically connected to the two connection points of the load resistor RL and the load motor M respectively. in, figure 1 Also shown is a virtual insulation resistance RL2 between the system 100 and a reference ground (English: Ground, GRD for short), and a capacitance CL to ground. It should be noted that, for electric vehicles, the reference ground may be the metal structure of the vehicle chassis.
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The invention discloses an insulation detection apparatus for a DC gas system, and belongs to the electronic technical field. The insulation detection apparatus comprises a square wave signal source, an injection sampling circuit and a calculating unit, wherein the square wave signal source generates low frequency square wave signals, the injection sampling circuit injects square wave signals into the DC gas system and samples response signals generated under the excitation of injected square wave signals in the DC gas system, the calculating unit obtains sampling signals in front half period and a rear half period of the nth period where the square wave signals are in, and calculates the insulation resistor value of the DC gas system according to the obtained sampling signals. The sampling signals in the front half period include sample signals starting from a first predetermined time period after entering the front half period to the finishing of the entrance of the rear half period, and the sampling signals in the rear half period include sample signals starting from a first predetermined time period after entering the rear half period to the finishing of the nth period.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to an insulation detection device for a DC electrical system. Background technique [0002] The DC electrical system of an electric vehicle has voltage levels that pose a threat to personal safety. During the operation or charging of the vehicle, the battery pack of the vehicle and all the electrical components in the electrical system of the power equipment need to be well insulated from the vehicle body. For this reason, it is necessary to conduct real-time insulation detection on the vehicle. [0003] The existing insulation detection method is to connect a switch and a reference resistor network between the protective ground conductor and multiple electrical connection points of the DC electrical system under test. The structure of the reference resistor network is changed through the control of the switch, and an analog-to-digital converter (English: Analog-to-Digital Conv...
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IPC IPC(8): G01R31/12
Inventor 王运国吴世宾
Owner 湖北鸿飞电子科技有限公司