Single stage power factor corrected power converter with reduced AC inrush
First Claim
1. A control circuit that interconnects an output line to a load, said control circuit being connected to a source of DC voltage, having first and second terminals, said control circuit being powered by a DC voltage applied from said source of DC voltage across a pair of input lines, the control circuit comprising:
- smoothing capacitor means connected across said pair of input lines, a pair of switching devices connected in series across said pair of input lines, said output line being connected to the junction of said pair of serially connected switching devices, there being a switching control associated with the switching devices for switching the switching devices to conduct alternatively between positive and negative ones of said pair of input lines at a predetermined high frequency, there being a finite time between each of the switching during which both of said switching devices are in a non-conductive state;
resonant circuit means having a first, second and third terminals and comprising a series connected resonant inductor means and an AC blocking capacitor means, said resonant circuit means being connected at said first terminal to said output line and at said second terminal to both of said pair of input lines;
load means connected between said third terminal of said resonant circuit means and said a first of said pair of input lines; and
a secondary power source means for providing an auxiliary source of power to said load means near zero crossings of the line AC voltage.
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Accused Products
Abstract
The improved single stage power converter circuit topology substantially reduces EMI that is conducted to the AC line, reduces input AC current inrush, improves output ripples by the use of an auxiliary supply near zero crossings of the line AC voltage, provides Power Factors greater than 0.95, provides Total Harmonic Distortions less than 15%, and maintains constant power, including constant power in a non-linear output load. Further, this circuit topology provides output open and short circuit protections by reducing current stress in power components. This topology can also make the power source to appear as a fast-acting variable impedance source, an ideal source for powering an output load that has negative resistance characteristics such as gas discharge lamps.
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Citations
28 Claims
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1. A control circuit that interconnects an output line to a load, said control circuit being connected to a source of DC voltage, having first and second terminals, said control circuit being powered by a DC voltage applied from said source of DC voltage across a pair of input lines, the control circuit comprising:
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smoothing capacitor means connected across said pair of input lines, a pair of switching devices connected in series across said pair of input lines, said output line being connected to the junction of said pair of serially connected switching devices, there being a switching control associated with the switching devices for switching the switching devices to conduct alternatively between positive and negative ones of said pair of input lines at a predetermined high frequency, there being a finite time between each of the switching during which both of said switching devices are in a non-conductive state;
resonant circuit means having a first, second and third terminals and comprising a series connected resonant inductor means and an AC blocking capacitor means, said resonant circuit means being connected at said first terminal to said output line and at said second terminal to both of said pair of input lines;
load means connected between said third terminal of said resonant circuit means and said a first of said pair of input lines; and
a secondary power source means for providing an auxiliary source of power to said load means near zero crossings of the line AC voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification