AC to DC converter with unity power factor
June 23, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3571697 3696286 System-state and operating condition sensitive control method and apparatus for electric power delivery systems Homogenizer/subsampler for tar sand process streams Auxiliary backup regulator control for paralleled converter circuits controlled by a master regulator Unity power factor switching regulator AC-DC Converter having an improved power factor Boost power supply having power factor correction circuit Digitally controlled power supply Unity power factor power supply InventorApplicationNo. 370611 filed on 06/23/1989US Classes:323/222, Using choke and switch across source323/285, With plural condition sensing363/81, By rectifier363/89With transistor control means in the line circuitExaminersPrimary: Wong, Peter S.Attorney, Agent or FirmInternational ClassG05F 001/613AbstractAn AC to DC converter comprises a bridge rectifier followed by a boost circuit. The boost circuit includes an inductor, diode and load capacitor in series and a shunting switch connected to shunt the diode and load capacitor. The control circuit for switching the shunting switch comprises a differential circuit, a multiplier and a duty cycle generator in a feedback loop which maintains a constant output voltage on the capacitor. To eliminate the response to ripple on the output voltage, the differential circuit does not respond to voltages within a dead band.Field of SearchUsing choke and switch across sourceWith additional series regulator Switched (e.g., switching regulators) Digitally controlled With threshold detection With plural condition sensing Including filter sensing In flyback path Single-ended, separately-driven type With transistor control means in the line circuit By pulse modulation technique (e.g., PWM, PPM, etc.) | |
