Bridgeless boost converter with PFC circuit
First Claim
1. A bridgeless PFC boost converter comprising:
- a boost inductor having a first end connected to a first AC input terminal and a second end connected to a first junction defined between the anode of a first diode and a first terminal of a first switch;
a second terminal of the first switch connected to a common line;
a parallel circuit of a capacitance and load terminals connected between the cathode of the first diode and the common line;
a series circuit of a second diode and a second switch connected between the cathode of the first diode and the common line;
a second AC input terminal connected to a second junction defined between the anode of the second diode and the second switch; and
a control circuit connected for controlling the first and second switches so as to provide power factor correction with respect to power applied to said load terminals.
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Accused Products
Abstract
A boost type power supply circuit for providing a DC output voltage comprising first and second semiconductor switches coupled between respective input lines and a common connection; an AC input voltage from an AC source being supplied across the input lines; first and second diodes coupled in series with respective ones of the switches; third and fourth diodes coupled across respective ones of the switches in a free-wheeling relationship with the switches; an inductance coupled in at least one of the input lines; a controller for controlling the conduction times of the switches by providing a pulse width control signal to each of the switches; wherein the controller turns on at least one of the switches during a positive half cycle of the AC voltage to allow energy storage in the inductance and turns off the at least one switch to allow the energy stored in the inductance to be supplied to an attached load through one of the first and second diodes and one of the third or fourth diodes; and the controller turns on at least one of the switches during a negative half cycle of the AC voltage to allow energy storage in the inductance and turns off at least one switch to allow the energy stored in the inductance to be supplied to the attached load through one of the first and second diodes and one of the third and fourth diodes. The controller determines an on-time and an off-time of a pulse of the pulse width modulated control signal during each half cycle of the AC voltage, the on-time and off-time of the pulse being controlled to regulate said output voltage and to provide power factor correction of said AC input voltage, based on either voltage sensing or current sensing.
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Citations
28 Claims
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1. A bridgeless PFC boost converter comprising:
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a boost inductor having a first end connected to a first AC input terminal and a second end connected to a first junction defined between the anode of a first diode and a first terminal of a first switch;
a second terminal of the first switch connected to a common line;
a parallel circuit of a capacitance and load terminals connected between the cathode of the first diode and the common line;
a series circuit of a second diode and a second switch connected between the cathode of the first diode and the common line;
a second AC input terminal connected to a second junction defined between the anode of the second diode and the second switch; and
a control circuit connected for controlling the first and second switches so as to provide power factor correction with respect to power applied to said load terminals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A boost type power supply circuit for providing a DC output voltage comprising:
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first and second semiconductor switches coupled between respective input lines and a common connection, an AC input voltage from an AC source being supplied across the input lines;
first and second diodes coupled in series with respective ones of the switches;
third and fourth diodes coupled across respective ones of the switches in a free-wheeling relationship with the switches, an inductance coupled in at least one of the input lines;
a controller for controlling the conduction times of the switches by providing a pulse width control signal to each of the switches;
whereby the controller turns on at least one of the switches during a positive half cycle of the AC voltage to allow energy storage in the inductance and turns off at least one switch to allow the energy stored in the inductance to be supplied to an attached load through one of the first and second diodes and one of the third and fourth diodes; and
the controller turns on at least one of the switches during a negative half cycle of the AC voltage to allow energy storage in the inductance and turns off the at least one switch to allow the energy stored in the inductance to be supplied to the attached load through one of the first and second diodes and one of the third and fourth diodes; and
wherein the controller determines an on-time and an off-time of a pulse of the pulse width modulated control signal during each half cycle of the AC voltage based on at least one input without requiring sensing of the input current from the AC source;
the on-time and off-time of the pulse being controlled to regulate said output voltage and to provide power factor correction of said AC input voltage. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification