Call signal generating circuit

Details Call signal generating circuit Call signal generating circuit

H - Electricity

04

Q

H04Q 1/30 (2006.01) H04M 3/04 (2006.01) H04M 19/02 (2006.01) H02M 7/48 (2006.01)

Patent

CA 2076323

A call signal generating circuit includes a step-up transformer having a primary winding and secondary windings, a first switching circuit coupled between the primary winding of the step-up transformer and a D.C. power source for turning ON/OFF at a frequency higher than a frequency of a call signal which is to be generated by the call signal generating circuit, a rectifying circuit coupled to the secondary windings of the step-up transformer for rectifying voltages induced at the secondary windings into a positive polarity voltage and a negative polarity voltage, a second switching circuit coupled to the rectifying circuit for alternatively outputting the positive polarity voltage and the negative polarity voltage with a quiescent time in which both the positive and negative polarity voltages are not output, a capacitor coupled to the second switching circuit for receiving the positive and negative polarity voltages output from the second switching circuit, a resistor coupled to the capacitor, a third switching circuit for discharging the capacitor during the quiescent time, where the resistor and the third switching circuit are coupled in series to form a series circuit which is coupled in parallel to the capacitor, and a pair of output terminals coupled to the capacitor for outputting the call signal.

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