| 摘要 |
<p>PURPOSE: To constitute a half bridge circuit of circuit elements less than the number of circuit elements required for a conventional circuit and to reduce the cost of the circuit by blocking the inflow of a current from an external power supply through a master switch. CONSTITUTION: Each device to be controlled is provided with corresponding switches or transistors(TRs) and diodes. Namely the circuit is provided with n solenoides L1 to LN, n TRs Q1 to QN and n diodes D1 to DN, and in the case of turning of an optional solenoid, a master TR Q0 is turned on and a TR corresponding to the solenoid is turned on. When the ON of more solenoids is required, the TR Q0 is held at the ON state and then suitable TRs are turned on. In the case of exciting the solenoid L3 e.g. the TRs Q3, Q0 are turned on and a current is supplied from the power supply to the solenoid L3 by a bus passing the Q3, L3 and Q0. In order to drive L2, L4, the TR Q0 is turned on, and the TRQ2 is turned off.</p> |
