Power conserving blocking oscillator power supply circuit

Details Power conserving blocking oscillator power supply circuit Power conserving blocking oscillator power supply circuit

H - Electricity

03

K

323/11

H03K 3/30 (2006.01) H02M 3/335 (2006.01) G05F 1/64 (1980.01)

Patent

CA 1153065

ABSTRACT OF THE DISCLOSURE A power source circuit for a discharge type sensing circuit, comprising a blocking oscillator and a feedback circuit for changing the period of oscillation of the blocking oscillator is disclosed. The sensing circuit as a load is connected to a secondary winding of a transformer of the blocking oscillator. The base bias of a transistor of the blocking oscillator is controlled by the feedback circuit to which is applied a negative voltage produced in the primary winding in an off state of the transistor. As a result, when the sensing circuit is in the sensing mode of operation, the period of oscillation becomes shorter for rapid supply of electric power and, when in the waiting mode of operation, the period of oscillation becomes longer for reducing supply of power, so that the power consumption is reduced as a whole.

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