Battery-capacity supervisory control device and method thereof

摘要

A battery-capacity supervisory control device includes a DC current/DC voltage detecting loop, a microprocessor and a display unit. The DC current/DC voltage detecting loop is connected between a battery and a power inverter for detecting a first voltage value before the battery electrically discharges, and a second voltage value as well as an output current value of the battery after electrically discharging for a time unit of the battery, to calculate the available capacity of the battery and to calculate the available time of the battery under loading according to the available capacity of the battery through the microprocessor. The display simultaneously displays the available time of the battery under loading and the available capacity of the battery. Therefore, a user effectively supervises and assures the battery is in the usable state.

主权项

1. A method of supervising a battery for a load through a power inverter, comprising the steps of:
(a) electrically connecting a DC detecting loop between said battery and said power inverter for detecting output current and voltage of said battery; (b) obtaining a first voltage value before said battery electrically discharges; (c) obtaining a second voltage value as well as an output current value of said battery after electrically discharging for a predetermined time unit of said battery; and (d) determining an available capacity of said battery in responsive to said first and second voltage values, a voltage value of said battery in an empty state which is a known value, said output current value of said battery, and time of electrical discharging via a microprocessor in accordance with a formula: said available capacity of said battery=[(said second voltage value−said voltage value of said battery in an empty state)/(said first voltage value−said second voltage value)]×said output current value of said battery×said time of electrically discharging.