AC COUPLED SWITCHING POWER SUPPLY AND METHOD THEREFOR
A circuit for converting high voltage AC to low voltage DC has an input capacitor coupled an input AC source. A rectifier is coupled to the input capacitor. A switch is coupled to the rectifier. A voltage regulator is coupled to the switch. The voltage regulator regulates an output of the circuit by closing the switch when a rising edge of a rectified AC voltage is below an output voltage and opens the switch when the output voltage reaches a regulation voltage. A storage capacitor is coupled to the switch.
1 . A circuit for converting high voltage AC to low voltage DC comprising:
an input capacitor coupled an input AC source;
a rectifier coupled to the input capacitor;
a switch coupled to the rectifier;
a voltage regulator coupled to the switch, the voltage regulator regulates an output of the circuit by closing the switch when a rising edge of a rectified AC voltage is below an output voltage and opens the switch when the output voltage reaches a regulation voltage; and
a storage capacitor coupled to the switch.
2 . A circuit for converting high voltage AC to low voltage DC in accordance with claim 1 wherein the switch is a transistor.
3 . A circuit for converting high voltage AC to low voltage DC in accordance with claim 1 wherein the switch is an N-channel transistor.
4 . A circuit for converting high voltage AC to low voltage DC in accordance with claim 1 wherein the switch is an N-channel IGBT.
5 . A circuit for converting high voltage AC to low voltage DC in accordance with claim 1 wherein the input capacitor acts as a capacitive divider with an output load.
6 . A circuit for converting high voltage AC to low voltage DC in accordance with claim 1 further comprising a fuse coupled in series with the an input capacitor and the input AC source.
7 . A circuit for converting high voltage AC to low voltage DC in accordance with claim 1 further comprising a varistor coupled to the input capacitor and the rectifier.
8 . A circuit for converting high voltage AC to low voltage DC in accordance with claim 1 wherein the rectifier is a full bridge rectifier.
9 . A circuit for converting high voltage AC to low voltage DC comprising:
an input capacitor coupled an input AC source, the input capacitor acing as a capacitive divider with an output load;
a full bridge rectifier coupled to the input capacitor;
a switch coupled to the full bridge rectifier;
a voltage regulator coupled to the switch, the voltage regulator regulates an output of the circuit by closing the switch when a rising edge of a rectified AC voltage is below an output voltage and opens the switch when the output voltage reaches a regulation voltage; and
a storage capacitor coupled to the switch.
10 . A circuit for converting high voltage AC to low voltage DC in accordance with claim 9 wherein the switch is a transistor.
12 . A circuit for converting high voltage AC to low voltage DC in accordance with claim 9 wherein the switch is an N-channel transistor.
13 . A circuit for converting high voltage AC to low voltage DC in accordance with claim 9 wherein the switch is an N-channel IGBT.
14 . A circuit for converting high voltage AC to low voltage DC in accordance with claim 9 further comprising a fuse coupled in series with the the input capacitor and the input AC source.
15 . A circuit for converting high voltage AC to low voltage DC in accordance with claim 9 further comprising a varistor coupled to the input capacitor and the rectifier.
16 . A circuit for converting high voltage AC to low voltage DC in accordance with claim 1 wherein the input capacitor is a film capacitor.
17 . A circuit for converting high voltage AC to low voltage DC comprising:
an input capacitor coupled an input AC source, the input capacitor acing as a capacitive divider with an output load;
a full bridge rectifier coupled to the input capacitor;
a fuse coupled in series with the the input capacitor and the input AC source;
a varistor coupled to the input capacitor and the rectifier;
a switch coupled to the full bridge rectifier;
a voltage regulator coupled to the switch, the voltage regulator regulates an output of the circuit by closing the switch when a rising edge of a rectified AC voltage is below an output voltage and opens the switch when the output voltage reaches a regulation voltage; and
a storage capacitor coupled to the switch.
18 . A circuit for converting high voltage AC to low voltage DC in accordance with claim 17 wherein the switch is a transistor.
19 . A circuit for converting high voltage AC to low voltage DC in accordance with claim 17 wherein the switch is an N-channel transistor.
20 . A circuit for converting high voltage AC to low voltage DC in accordance with claim 17 wherein the input capacitor is a film capacitor.