| 摘要 |
PURPOSE:To make common an auxiliary power source coil and a load voltage detecting coil by providing a circuit which is connected with the secondary coil of a voltage transformer to rectify the positive and negative AC voltages so that they may become an auxiliary power source of an electronic circuit. CONSTITUTION:A voltage is taken out by a voltage transformer 11. Since this voltage is alternating, it is rectified and smoothened to generate preset DC voltages VDD and VSS, which are fed to a multiplying circuit 13 and an integrating circuit 14. Voltage signals v proportional to the load voltage are taken out and fed to the multiplying circuit 13. Since the current signals i are fed to the multiplying circuit 13, multiplication is accomplished between the voltage signals v and the current signals i. After that, the time integration is accomplished by the circuit 14 to generate signals as a watt. |
