| 摘要 |
PURPOSE:To effectively perform power control by providing an FET connected with a variable resistor to the source at the output side of a full-wave rectifier connected to the capacitor charging circuit of a gate trigger circuit. CONSTITUTION:A current flowing through an FET10 depends upon a voltage applied between the gate and the source of the FET, becoming the voltage VGS=-I.R11, where I represents a current flowing through the FET10, and R11 represents the resistance value of the resistor 11. When the voltage of the power source 1 is increased and the current flowing through the FET10 becomes increased, the voltage VGS becomes large, acting to decrease the current, thereby eventually increasing no current. Similarly, even when the power voltage is lowered, the VGS is increased, thereby eventually reducing no current, and maintaining the current at a constant level. In this manner, the variation in the power of the load can be reduced even at the voltage varying time. |
