Starting circuit for a pulse width modulated d.c. to d.c....

Details Starting circuit for a pulse width modulated d.c. to d.c.... Starting circuit for a pulse width modulated d.c. to d.c....

H - Electricity

02

M

321/27

H02M 1/08 (2006.01) H02H 7/12 (2006.01) H02M 3/335 (2006.01) H02M 1/00 (2006.01)

Patent

CA 1084993

STARTING CIRCUIT FOR A PULSE WIDTH MODULATED D.C. TO D.C. CONVERTER Abstract A D.C. to D.C. converter including a start circuit having a choke with a primary winding and a start winding. A portion of the input power is fed through a section of the start winding to the base of a switching transistor connected in series with the primary winding. The trans- istor is operated as a blocking oscillator by the start circuit and a voltage is induced across a secondary winding of the choke. The secondary voltage is rectified and fed to the control input of a pulse width modulator. In re- sponse to a predetermined level of the secondary voltage, the output of the pulse width modulator is coupled to the base of the transistor and the start circuit disabled. Current overload and transient voltage protection circuits are also included.

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