INSULATING TYPE SWITCHING MEANS HAVING SHIELDING FUNCTION, ONE-WAY INSULATING TYPE SWITCHING MEANS HAVING SHIELDING FUNCTION, ONE-WAY INSULATING TYPE THREE-TERMINAL SWITCHING MEANS HAVING SHIELD FUNCTION, TWO-WAY INSULATING TYPE SWITCHING MEANS HAVING SHIELDING FUNCTION, AND TWO-WAY INSULATING TYPE THREE-TERMINAL SWITCHING MEANS HAVING SHIELDING FUNCTION

摘要

PROBLEM TO BE SOLVED: To shield between both switching terminals at the time of a switch off. ;SOLUTION: For instance, 1st and 2nd two-way insulation type switching means (parts of transistors 2 and 3, etc., and parts of transistors 4 and 5, etc.), are connected serially, a 3rd two-way insulation type switching means (parts of transistors 6 and 7, etc.), is connected to the connection point, an open end of the 3rd insulation type switching means is grounded and an on/off drive means (parts of transistors 8 to 10, etc.), which drive the on/off of the 1st and 2nd insulating type switching means and the 3rd insulating type switching means in direct opposition is provided. Thus, when the on/off drive means drives the transistors 2 to 5 off and performs off control between both switch terminals SW1 and SW2, the transistors 6 and 7 are driven on, both drains of the transistors 3 and 4 are grounded, and shielding is made between both the terminals SW1 and SW2.;COPYRIGHT: (C)1999,JPO