| 摘要 |
<p>1,255,099. Battery charging of standby supply systems. BURROUGHS CORP. 4 Sept., 1969 [9 Sept., 1968], No. 43772/69. Heading H2H. A power supply system comprises a battery, a load and a battery charging means effective to charge the battery and supply at least a portion of the load simultaneously, together with control means responsive to a condition of the battery whereby to connect the battery to, or disconnect it from, the charging means in accordance with the battery condition. A battery 59, has two sections 61, 63 each section being provided with a charging circuit which includes a secondary winding on a transformer 49, a full wave bridge rectifier and a switch (57 or 69) which is responsive to the pressure of the gas generated in the respective batteries during charging, the operation of the switches 57, 69 being to connect the batteries to the battery charging circuits when the gas pressures in the batteries are low thus indicating low states of battery charge and to disconnect the batteries from the charging circuits when the gas pressures are high, that is, when the batteries are fully charged. When an A.C. supply is present at terminals 45, 47 a relay 71 is energized to open contact 77. The potential at point 85 is then zero and the states of a multivibrator 83 and flip-flop 87 are such that relay 91 is energized to close contacts 93, 95. Thus the batteries are charged and the essential and non-essential loads at terminals 97, 99 and 101, 103 respectively supplied from the A.C. supply. On failure of the A.C. supply the relay 71 is de-energized, contacts 77 close and the conditions of the devices 83, 87 become such that relay 91 is de-energized. Contacts 93, 95 then open to disconnect the non-essential loads, the supply to the essential loads on terminals 97, 99 being maintained by the batteries.</p> |
