Device for converting high voltage alternating current to low voltage direct current
AssigneeSupertex, Inc.
InventorJimes Lei
Life of this patent
Estimating the term…
Abstract
A device which rectifies and regulates high voltage alternating current without the use of transformers, large capacitive coupling circuits or high voltage linear regulators. The device includes a rectifier, a control circuit for sensing the output voltage of the rectifier and switching on and off the input power, a storage capacitor and a low voltage linear regulator. The control circuit, which incorporates a voltage sensing circuit and a switch, limits the output voltage of the rectifier as seen by the linear regulator.
Claims20
A device for converting high voltage alternating current to low voltage direct current comprising:
- an alternating current (AC) input voltage;
- a rectifier coupled to the AC input voltage;
- a control circuit connected to an output of the rectifier, the control circuit comprising:
- a voltage sensing circuit, the voltage sensing circuit comprising:
- a zener diode connected to the output of the rectifier;
- a voltage divider comprising a first resistor and a second resistor, wherein the first resistor is connected to the zener diode and the second resistor is connected to ground potential;
- and
- a sensing transistor wherein a base of the sensing transistor is connected to the voltage divider;
- and
- a switch comprising a MOSFET transistor wherein a gate electrode of the MOSFET transistor is connected to a collector of the sensing transistor, a drain electrode is connected to the output of the rectifier and a source electrode is coupled to ground potential;
- a linear regulator coupled to the control circuit;
- and
- a storage capacitor coupled to the control circuit and further coupled to the linear regulator.
A device for converting high voltage alternating current to low voltage direct current comprising:
- an alternating current (AC) input voltage;
- a rectifier coupled to the AC input voltage;
- a control circuit connected to an output of the rectifier, the control circuit comprising:
- a voltage sensing circuit, the voltage sensing circuit comprising:
- a zener diode connected to the output of the rectifier;
- a voltage divider comprising a first resistor and a second resistor, wherein the first resistor is connected to the zener diode and the second resistor is connected to ground potential;
- and
- a first transistor wherein a base of the transistor is connected to the voltage divider;
- and
- a switch comprising a second transistor wherein a control electrode of the second transistor is connected to a collector of the first transistor, a first current conducting electrode of the second transistor is connected to the output of the rectifier and a second current conducting electrode of the second transistor is coupled to ground potential;
- a linear regulator coupled to the control circuit;
- and
- a storage capacitor coupled to the control circuit and further coupled to the linear regulator.
Dependencies are inferred from the claim text.