Equipment for measuring potential difference on traction batteries - uses generator of rectangular waves with peaks proportional to potential difference to be measured

摘要

The potential measuring equipment is for a traction battery (B) which is connected to a signal generator (13) which produces rectangular waves of constant frequency and cyclic ratio controlled by time constants set by resistors (9,10) and capacitors (11,12). The output of the generator supplies a ferrite isolating transformer through a capacitor (14). The average value of the generator output is restricted to zero by the series resistor (14) to avoid transformer saturation but the crests are proportional to battery voltage. The transformer output is rectified by a resistor capacitor combination (18,19) for measurement at output terminals (3,4). ADVANTAGE - Equipment monitors battery voltage within narrow range, has low consumption and isolates battery from metering.