| 摘要 |
PROBLEM TO BE SOLVED: To lessen the number of conductor lines for driving a load without necessitating an expensive device such as a microcomputer. SOLUTION: A load driving device 1 comprises a source of high voltage Vhigh, a source of middle voltage Vmid, and a source of low voltage GND, a pair of switches SW1 , SW2 which are connected in series between the source of high voltage Vhigh and the source of low voltage GND, and a pair of semiconductor elements D1 , D2 , with their one ends connected to one and the same conductor line 2 extracted from a connection node N1 of the switches SW1 , SW2 , and which conduct in opposite directions. Current supplying terminals of two loads L1 , L2 are connected to the other ends of the semiconductor elements D1 , D2 respectively and the other current supplying terminals of the loads L1 , L2 are connected to the source of middle voltage Vmid. By changing the direction of current in the conductor line 2 by means of the switches SW1 , SW2 , the loads L1 , L2 can be selectively driven. |
