Patent ID: 6539928
Filing Date: 2003-04-01
Classification: F02P

Abstract:
A vehicle-mounted ignitor comprising:a primary coil of an ignition coil and an insulated gate type semiconductor device which are connected in series with a direct current source; an ignition plug connected to a secondary coil of the ignition coil, to which a higher voltage generated across the secondary coil by switching of said semiconductor device is applied; a current restricting circuit for restricting a main current flowing through said semiconductor device to a predetermined value or less by controlling the potential on a control electrode of said semiconductor device; and a current supply circuit for supplying said control electrode with a current from one of a pair of main terminals of said semiconductor device having a higher potential, wherein said current supply circuit has at least a resistor and potentially connects said main terminal having the higher potential to said control terminal without interposing any semiconductor switching element therebetween.