UNIDIRECTIONAL INSULATING TYPE SWITCHING CIRCUIT, BIDIRECTIONAL INSULATING TYPE SWITCHING CIRCUIT, THREE-TERMINAL INSULATING TYPE SWITCHING CIRCUIT, THREE-TERMINAL BIDIRECTIONAL INSULATING TYPE SWITCHING CIRCUIT, MULTIPLE TERMINAL INSULATING TYPE SWITCHING CIRCUIT, MULTIPLE TERMINAL BIDIRECTIONAL INSULATING TYPE SWITCHING CIRCUIT, MULTIPLE TERMINAL SWITCHING TYPE BIDIRECTIONAL INSULATING TYPE SWITCHING CIRCUIT AND IGNITION DISTRIBUTION CIRCUIT

摘要

PURPOSE: To improve insulating performance by increasing turning on/off speed and simultaneously shortening a time when an insulating state is destroyed transiently in turning on/off. ;CONSTITUTION: This circuit is constituted in such a way that a controllable unidirectional switch is comprised by connecting, for example, a diode 11 to the source of a transistor 1 that is a normally--on junction type FET, and a switch 2 and a diode 12 are connected in series by arranging their directions so as to hold a DC power source 4 there between them, and a closed circuit in which a backward bias voltage can be supplied between the gate and source of the diode 12 from the DC power source 4 when the switch 2 is turned on is formed so as to set the diode 12 on a diode 11 side, and also, by arranging both directions, and a resistor 5 which discharges capacitance between the gate and source when the switch 2 is turned off is provided. In this way, since the turning on of the transistor 1 can be controlled by a voltage zero, no forward bias means to function so as to delay the turning on/off is required.;COPYRIGHT: (C)1995,JPO