| 摘要 |
1295702 Battery charging systems McCULLOCH CORP 24 July 1970 [24 July 1969] 35995/70 Heading H2H [Also in Division H3] A method of rapidly charging a battery comprises changing a D.C. voltage into an A.C. voltage, rectifying the A.C. voltage into a pulsating D.C. voltage which is applied to the battery through means including a switch so as to charge the battery, the battery being discharged through the switch every time the A.C. voltage drops below the battery voltage. A battery 50 is charged from an A.C. source 10 by way of a rectifier 11, an oscillator-inverter 2. A transformer 3 and rectifier 4, a further inverter 8 being provided if the power output of inverter 3 is insufficient. The output waveforms of the inverters are substantially square waves having steep trailing edges with short transition periods between the positive and negative pulses. By arranging that the diodes 62, 63 in the rectifier 4 have a suitable recovery timesay 50 microseconds-the diodes will then remain conductive during the transition period so that during this transition period the battery 50 will discharge through the diode 60. In order to prevent overcharging of the battery 50 a control circuit 5 is employed. A voltage divider 51, 52, 53 senses the battery voltage' such that at a predetermined voltage thereacross the thyristor. 56 fires to energize a relay W A so opening a contact A 1 in the supply to the rectifiers 11, 7. In other embodiments the battery charging may be terminated by sampling the quiescent battery voltage or by means responsive to the integrated battery terminal voltage. The relay W A may be replaced by solid state means and the device for terminating the battery charge may act directly on the inverters.
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