BATTERY VOLTAGE MEASUREMENT DEVICE

摘要

Disclosed is a battery voltage measurement device provided with: an A/D converter (20) that measures the voltage of a battery cell and converts the voltage value to a digital voltage value; a communication means (40) that transmits the digital voltage value; a microcomputer (50) that obtains the digital voltage value; an analog low-pass filter (10) inserted between battery modules and the A/D converter (20); and a digital low-pass filter (30) inserted between the A/D converter (20) and the communication means (40). The digital low-pass filter (30) cuts off frequencies greater than or equal to half the sampling frequency of the digital voltage value obtained by the microcomputer (50) and sets the sampling frequency of the A/D-converted digital voltage value higher than the sampling frequency of the digital voltage value obtained by the microcomputer (50). The analog low-pass filter (10) cuts off frequencies greater than or equal to half the sampling frequency of the battery voltage that is A/D converted.