Contactor monitor for charging stations

Details Contactor monitor for charging stations Contactor monitor for charging stations

1999-08-11

2000-07-18

Tso, Edward H.

Electricity: battery or capacitor charging or discharging

Cell or battery charger structure

Having plug for a-c receptacle

320128, H01M 1044, H01M 1046

Patent

active

060912235

ABSTRACT:
A monitoring device for sensing the voltage drop across a contactor in an electrical circuit. Voltage drop across the contactor is sensed by providing alternate current paths from either side of the contactor through a threshold sense circuit. The alternate current paths contain non-resistive voltage dropping components such that the relative amount of conduction through each path is determined largely by the voltage drop across the contactor. A signal is provided by the threshold sense circuit according to the relative currents which represents the voltage drop across the contactor. In this way, an increased voltage drop across the contacts of the contactor can be determined before dangerous amounts of heat are dissipated in high current switching circuits.

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patent: 5220268 (1993-06-01), Rose et al.
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patent: 5536173 (1996-07-01), Fujitani et al.
patent: 5558533 (1996-09-01), Hashizawa et al.

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