Pulse width modulated voltage converter

Details Pulse width modulated voltage converter Pulse width modulated voltage converter

H - Electricity

04

M

379/12

H04M 3/02 (2006.01) H03K 7/08 (2006.01) H04M 19/02 (2006.01) H04M 19/04 (2006.01) H02M 7/48 (2006.01)

Patent

CA 1174390

ABSTRACT OF THE DISCLOSURE A pulse width modulated voltage converter is proposed, which converts a direct voltage to a sinusoidal alternating voltage with low frequency for use as a ringing signal generator for telephone exchanges. The converter includes a power stage comprising a ferrite core transformer with two switches on the primary side and two switches on the secondary side. The switches are controlled by control pulses from a pulse width modulator with a variable pulse width so that they are switched with a frequency which is much higher than the frequency of the sinusoidal alternating current and so that a pulsing of the energy flow between battery and load side is obtained.

391711

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