A kind of insulation detection device of DC electrical system
An electrical system and detection device technology, applied in the field of electronics, can solve problems such as insulation resistance error, and achieve the effect of solving high precision requirements
Active Publication Date: 2017-11-14
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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Embodiment
[0042] 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 device for a DC electrical system, which belongs to the technical field of electronics. The device includes: a square wave signal source, an injection sampling circuit and a calculation unit. The square wave signal source is used to generate a low-frequency square wave signal. The injection sampling circuit is used to inject the square wave signal into the DC electrical system, and the DC electrical system is injected The response signal generated under the excitation of the square wave signal is sampled, and the calculation unit is used to, in the nth period of the square wave signal, obtain the sampling signals of the first half period and the second half period of the nth period respectively; According to the obtained sampling signal, calculate the value of the insulation resistance of the DC electrical system. The sampling signal in the first half period includes the sampling signal from entering the first half period and passing the first specified time period to entering the end of the second half period; The sampling signal in the second half period includes the sampling signal from the beginning of entering the second half period and passing through the first specified time period to the end 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