| 摘要 |
A battery charger for nickel-cadmium batteries uses a silicon controlled rectifier to rectify the alternating supply voltage. The silicon controlled rectifier has a current applied to its gate near the end of each positive half-wave, at a point after the voltage is low enough not to injure the battery being charged. An electronic timer is used to select the desired point in the half-wave, time being dependent on the charging of a capacitor. To terminate the charging, the circuit to the capacitor is opened. Termination of charging may be by monitoring the temperature of the battery and terminating on reaching a predetermined temperature, or by monitoring the battery voltage and terminating when the change in the voltage reverses.
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