Voltage detection circuit and device

Abstract

The present invention discloses a voltage detection circuit and a voltage detection device. The voltage detection circuit comprises a high-voltage detection module and a low-voltage receiving module.The high-voltage detection module is in communication connection with the low-voltage receiving module; the high-voltage detection module is used for a multi-level converter; the high-voltage detection module is configured to perform sampling detection of bus voltage signals at a direct current side of the multi-level converter, perform encoding of the obtained sampling voltages and send the encoded sampling voltage to the low-voltage receiving module, the low-voltage receiving module is configured to emit signals to a measurement instrument after decoding. The communication connection betweenthe high-voltage detection module and the low-voltage receiving module achieves high-voltage isolation so as to achieve high insulation grade. The voltage detection circuit and device achieve sampling of a direct current capacitive voltage of the multi-level converter unit to facilitate detection of real-time data of the direct current capacitive voltage of a cascade unit in development, debugging and operation processes.

Description

technical field [0001] The invention relates to the technical field of power resistors, in particular to a voltage detection circuit and device. Background technique [0002] Cascaded multilevel converters are widely used in many fields such as power systems, mines, and industrial production. Specific application types include Static Var Generator (SVG), Active Filter (APF), Unified Power Flow Controller (UPFC), Unified Power Quality Conditioner (UPQC), etc. [0003] These multilevel converters are composed of multiple units with lower voltage levels connected in series, and the total output voltage level is higher, so the insulation level between all units and the ground is required to be higher. The capacitor voltage of the DC side of the multilevel converter is of great significance to the fault detection and diagnosis in the process of development, debugging and operation. [0004] The existing technology usually uses high-voltage isolation probes to detect higher-leve...

AI Technical Summary

Problems solved by technology

Therefore, it becomes difficult to detect the real-time data of the DC capacitor voltage of the cascaded unit during development, debugging and operation.

Images