20 Hz ring generator using high frequency PWM control

Details 20 Hz ring generator using high frequency PWM control 20 Hz ring generator using high frequency PWM control

1991-12-19

1994-04-26

Dwyer, James L.

Telephonic communications

Call signal generating

379253, 379413, H04M 302

Patent

active

053074076

ABSTRACT:
A low frequency high voltage AC power for a telephone system is provided by a ring signal generator, which produces a ring signal from a DC power supply using a pair of switches controlled by pulse width modulation (PWM) circuit. The ring signal generator includes a PWM circuit driving a pair of MOSFET transistors via a respective pair of opto-isolators. The output of the MOSFET transistor switches is commonly connected to a low pass filter network. The ring signal generator of the present invention advantageously produces a 65 VRMS ring signal at very high efficiency.

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