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CA1171906A Expired / Lapsed CA ⏱️ 0.0 years remaining

Digitally controlled power supply with high power factor

Assignee: Raytheon Co
•
Filing: 1981-03-25
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Granted: 1984-07-31
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Expires: 2001-03-25
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Abstract

Abstract DIGITALLY CONTROLLED POWER SUPPLY Abstract of the Disclosure A high power factor AC to DC power supply having a high frequency pulse producing circuit comprising an in-ductor supplied with rectified raw AC power through a semiconductor switch which provides dynamic power factor correction by maintaining the width of the on-times of the switch substantially constant throughout each cycle of the input AC power. The peak energy stored in the in-ductor during the on-times are a function of the ampli-tude of the instantaneous voltage of said rectified AC power, so that each time the switch is turned off, the output pulse of current supplied to the load by the in-ductor has a time duration which is a direct function of the instantaneous voltage value of the rectified AC power. The output load has a filter whose time constant is greater than a cycle of said rectified AC power, and the average on-time of said switch is varied over a num-ber of cycles of said AC power to regulate the output voltage of said supply.

Inventors

  • 👤 Derek Chambers
  • 👤 Dee Wang

Bibliographic Details

Application Number —
Jurisdiction CA
Data Source google_patents
Last Synchronized 2026-10-31 12:15
CPC Classifications
—

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 88 words
A power supply comprising: means supplied from a source of alternating current power for providing rectified power which is substantially unfiltered at the frequency of said alternating current power; means supplied by said rectified power for producing pulses of power, said pulses having a frequency substantially greater than the frequency of said alternating current source; the voltage amplitudes of said pulses being greater than the voltage amplitude of said alternating current power; and the duration of said pulses being substantially constant over a cycle of said alternating current.
Claim 2
Dependent Claim 88 words
A power supply comprising: means supplied from a source of alternating current power for providing rectified power which is substantially unfiltered at the frequency of said alternating current power; means supplied by said rectified power for producing pulses of power, said pulses having a frequency substantially greater than the frequency of said alternating current source; the voltage amplitudes of said pulses being greater than the voltage amplitude of said alternating current power; and the duration of said pulses being substantially constant over a cycle of said alternating current.
Claim 3
Dependent Claim 31 words
The power supply in accordance with Claim 1 wherein: said rectified power producing means comprises filter means for substantially preventing a component of pulses from being coupled into said AC source.
Claim 4
Dependent Claim 28 words
The power supply in accordance with Claim 1 wherein: said pulse producing means comprises an inductor in series with a semiconductor switch to said rectified power producing means.
Claim 5
Dependent Claim 29 words
The power supply in accordance with Claim 2 wherein: said filter means comprises inductive means and comparative means for substantially reducing the chopper power coupled into said AC supply.
Claim 6
Dependent Claim 38 words
The power supply in accordance with Claim 1 wherein: said pulses of power vary substantially as a function of variations in the output voltage of said supply averged over at least a cycle of said alternating current power.
Claim 7
Dependent Claim 92 words
A power supply comprising: means supplied from a source of alternating current power for providing rectified power which is substantially unfiltered at the frequency of said alternating current power; means supplied by said rectified power for producing pulses of power, said pulses having a frequency substantially greater than the frequency of said alternating current source; the voltage amplitudes of said pulses being greater than the voltage amplitude of said alternating current power; and said pulses having a substantially constant frequency and substantially constant pulse widths over a cycle of said alternating current.
Claim 8
Dependent Claim 92 words
A power supply comprising: means supplied from a source of alternating current power for providing rectified power which is substantially unfiltered at the frequency of said alternating current power; means supplied by said rectified power for producing pulses of power, said pulses having a frequency substantially greater than the frequency of said alternating current source; the voltage amplitudes of said pulses being greater than the voltage amplitude of said alternating current power; and said pulses having a substantially constant frequency and substantially constant pulse widths over a cycle of said alternating current.

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