초록 ▼

A circuit arrangement for judging the lifetime of a battery used in a no-break power supply system includes a step-down transformer connected to an AC power source, a first switch connected between the transformer and a rectifier, a voltage detector connected to one electrode of a battery, an auto-t

A circuit arrangement for judging the lifetime of a battery used in a no-break power supply system includes a step-down transformer connected to an AC power source, a first switch connected between the transformer and a rectifier, a voltage detector connected to one electrode of a battery, an auto-timer connected to the voltage detector, and a second switch connected to the auto-timer and interlocked to the first switch.

대표청구항 ▼

A circuit arrangement for judging the lifetime of a battery in a no-break power supply system, comprising rectifier means having an input coupled to an AC power source; an inverter, having an automatic voltage regulating function, connected to an output of said rectifier means; a load connected to a

A circuit arrangement for judging the lifetime of a battery in a no-break power supply system, comprising rectifier means having an input coupled to an AC power source; an inverter, having an automatic voltage regulating function, connected to an output of said rectifier means; a load connected to an output of said inverter; a diode having a cathode connected to an input of said inverter; a battery having one electrode connected to an anode of said diode and another electrode connected to ground; and a charging unit connected between the input of said rectifier means and a junction point of said battery and said diode; characterized in that said circuit arrangement further comprises: a step-down transformer connected to said AC power source, said step-down transformer having at least two taps on a secondary side thereof; first switching means for electively connecting one of said two taps to the input of said rectifier means thereby coupling said rectifier means to said AC power source, whereby one of said taps is connected to the input of said rectifier means in a normal operating mode, while another of said taps, supplying a lower voltage than said one of said taps, is connected to the input of said rectifier means in a battery judging mode; a voltage detector, having a predetermined threshold level, connected to the junction point of said diode and said battery; an auto-timer for indicating a time duration having a stop input connected to an output of said voltage detector; second switching means connected to a start input of said auto-timer; and means for interlocking said second switching means to said first switching means, whereby when judging said battery, said first switching means is switched to connect said another tap to said rectifier means while said second switching means starts said auto-timer, said auto-timer being stopped by said voltage detector when a voltage at said junction point drops below said threshold level, the time duration indicated by said auto-timer being a measure of the lifetime of the battery.