Abstract: An Active Power Factor Correction (APFC) apparatus having improved output voltage regulation, for switching a power supply fed by an array of rectifying diodes and consisting of at least an input inductor, a contact of which is connected in series with a contact of the array, and of a controllable power switch connected in tandem with the array and the input inductor, that comprises a) sampling circuitry, for sampling the instantaneous value of the output voltage; b) control circuitry, for controlling the switching time of the controllable switch in response to an error signal, and, thereby, causing the instantaneous value to be essentially similar to a predetermined nominal value; c) amplifier circuitry, for generating the error signal, the amplifier circuitry having at least a reference input connected to a reference signal, being determined according to the nominal value and sampling circuitry, and an input, to which an input signal is provided, the error signal represents the deviation of the input signal

Abstract: A method for reducing the harmonics contents of an input current drawn from a power line into an electrical system without sensing an input voltage, the method comprising providing an active power factor correction controller with a switch module having a main switch and a timing device, wherein the main switch has an on-time correlated with an on-duty cycle duration, and an off-time correlated with an off-duty cycle duration, and maintaining a linear relationship between the off-duty cycle duration and the input current by using the timing device; and an apparatus for active power factor correction with minimum input current distortion, comprising an active power factor correction assembly that includes a main switch and a timing device, wherein the main switch has associated therewith an on-time correlated with an on-duty cycle duration, and an off-time correlated with an off-duty cycle duration, and wherein the timing device generates the mentioned on-time and off-time, and linearization means for maintain

Abstract: A method for reducing the harmonics contents of an input current drawn from a power line into an electrical system without sensing an input voltage, the method comprising providing an active power factor correction controller with a switch module having a main switch and a timing device, wherein the main switch has an on-time correlated with an on-duty cycle duration, and an off-time correlated with an off-duty cycle duration, and maintaining a linear relationship between the off-duty cycle duration and the input current by using the timing device; and an apparatus for active power factor correction with minimum input current distortion, comprising an active power factor correction assembly that includes a main switch and a timing device, wherein the main switch has associated therewith an on-time correlated with an on-duty cycle duration, and an off-time correlated with an off-duty cycle duration, and wherein the timing device generates the mentioned on-time and off-time, and linearization means for maintain

Abstract: Power factor correction apparatus, for a switching power supply fed by an array of rectifying diodes and consisting of at least an input inductor, a contact of which is connected in series with a contact of the array, and of a power switch connected between the other contact of the array and the other contact of the input inductor that comprises circuitry for identifying, in each cycle determined by the switching frequency of the power supply, whenever the instantaneous value of the current through the inductor reaches a minimal value; circuitry for switching the power switch to its conducting state in response to the minimal current through the inductor; circuitry for reflecting the current flowing through the inductor by a measurable or simulated parameter; and circuitry for providing indication, in each cycle, by using the parameter, the indication being related to the timing until the peak value of the current, that corresponds to a specific load, has been essentially reached, or to the time from the mome

Abstract: A controller for a PWM converter. The low frequency input impedance is an important parameter of PWM converters. In active power factor correction schemes, this impedance needs to resistive in order to keep the power factor near unity. The controller of the present invention will force the input terminals of a PWM converter, and in particular that of a Boost converter, to look resistive, or with a reactive component as desired. The advantages of the controller according to the present invention are simplicity, low cost, robustness and the fact that it does not require an analog multiplier and does not require sensing the input voltage.