Pulse width modulated boost converter integrated with power factor correction circuit
First Claim
1. A pulse width modulated boost converter which provides power factor correction between an input sinusoidal AC voltage source and a load, comprising:
- a) means for filtering said input sinusoidal AC voltage and producing a filtered output;
b) rectifying means for rectifying said filtered output to produce a rectified output; and
c) controlling means, controlling said rectifying means, and connected to said filtered output, for sensing both a zero crossover point and a maximum amplitude of said input sinusoidal AC voltage, wherein a phase of said rectified output is controlled.
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Abstract
An integrated power factor converter utilizes a silicon controlled rectifier (SCR) bridge which limits the inrush current by controlling the conduction angle of the SCR'"'"'s. The same SCR bridge shuts down the output in case of short circuit and recovers automatically at a predetermined duty cycle rate. In case the input voltage exceeds approximately 275 VAC, the SCR bridge regulates the output voltage to below 400 VDC. The input inrush current is reduced by phasing up the input voltage in a controlled manner. The use of SCR'"'"'s in the input bridge produces no additional losses, since the rectifier function is required regardless of which topology is used. The integrated power factor converter interfaces universal voltage mains to DC/DC converters while reducing input harmonics.
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Citations
15 Claims
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1. A pulse width modulated boost converter which provides power factor correction between an input sinusoidal AC voltage source and a load, comprising:
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a) means for filtering said input sinusoidal AC voltage and producing a filtered output; b) rectifying means for rectifying said filtered output to produce a rectified output; and c) controlling means, controlling said rectifying means, and connected to said filtered output, for sensing both a zero crossover point and a maximum amplitude of said input sinusoidal AC voltage, wherein a phase of said rectified output is controlled. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification