Insulation detection system

Abstract

The invention discloses an insulation detection system. The insulation detection system comprises a resistor R1, a resistor R2, a resistor Rs, a controllable voltage source Us, a voltage follower circuit and a sampling processing circuit, wherein the resistance values of the resistor R1, the resistor R2 and the resistor Rs can be dynamically controlled; the first end of the resistor R1 is connected with the positive electrode of high-voltage direct current output; the second end of the resistor R1 is connected with the first end of the resistor R2; the second end of the resistor R2 is connected with the negative electrode of the high-voltage direct current output; the negative electrode of the controllable voltage source Us is connected with the reference ground GND; the positive electrode of the controllable voltage source Us is connected with the first end of the resistor Rs; the second end of the resistor Rs is connected with the second end of the resistor R1; the potential difference signals at two ends of the resistor R3 are transmitted to the voltage input end of the voltage follower circuit; and the voltage output end of the voltage follower circuit is connected with the sampling processing circuit. The insulation detection system can detect the insulation condition of the high-voltage direct current system and has high detection precision.

Description

technical field [0001] The invention belongs to the field of electronic technology, and more specifically, the invention relates to an insulation detection system. Background technique [0002] In the high-voltage DC circuit of the ungrounded system (IT system), the reduction of the insulation characteristics of the high-voltage DC bus to the chassis will lead to accidents such as electric shock and equipment damage, and in severe cases, it will also cause major loss of life and property. Therefore, the high-voltage DC system must be Regular detection and effective monitoring of the insulation status of the system can improve the safety and reliability of the high-voltage DC system and eliminate potential safety hazards. [0003] At present, the existing insulation detection system generally uses a high-precision ADC (Analog-to-Digital Converter, analog-to-digital converter) sampling unit to regularly detect the voltage attenuation value of the resistor divider network betwe...

AI Technical Summary

Problems solved by technology

[0004] However, the insulation detection accuracy of the existing insulation detection system is largely limited by the accuracy of each resistance, the degree of optimization of the detection model, and the conversion accuracy of the ADC, resulting in low insulation detection accuracy

In addition, the resistor divider network used for high-voltage attenuation is affected by the input impedance of the ADC sampling unit, so it is not allowed to choose a larger divider resistor value, which leads to this insulation detection system reducing the high-voltage DC system to a certain extent. The insulation level, and make the insulation detection accuracy error is large

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