Base drive circuit of transistor

Details Base drive circuit of transistor Base drive circuit of transistor

H - Electricity

03

K

328/193

H03K 17/60 (2006.01) H03K 3/26 (2006.01) H03K 17/0812 (2006.01) H02M 7/5387 (2006.01)

Patent

CA 1268221

ABSTRACT OF THE DISCLOSURE The invention relates to technology to minimize power for suppressing ON base current to a transistor. In a base drive circuit of transistor, current is supplied to base of first and second transistors connected in series to DC power source, and the transistors are rendered on or off. The base drive circuit comprises a current transformer using a primary winding an AC bus connected in parallel between the joint of the first and second transistors and having a secondary winding energized by current of the primary winding and inducing current; a switching circuit including a first rectifier element for rectifying current induced in any of the secondary winding of the current transformer, a first switching element for supplying the rectified current outputted from the first rectifier element to base of any of the first and second transistors, an initial current supply circuit for supplying initial current to base of the transistor supplied with the rectified current in superposition on the current flowing through the first switching element, and a second switching element in bypass connection so as not to supply the rectified current to base of the transistor; and a second rectifier element for rectifying current induced in any other of the secondary winding of the current transformer, and an overvoltage suppression circuit comprising a reset circuit connected in series to the second rectifier element for applying reset to core of the current transformer.

534704

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