US5010278A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic switching ballast for a fluorescent lamp
Assignee: SUNG HO KOREA Co (PRESIDENT BOK HWAN KANG)
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Filing: 1989-06-14
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Granted: 1991-04-23
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Expires: 2009-06-14
Abstract
Abstract An electronic switching ballast for fluorescent lamp having a rectifying circuit, a square generator, a phase discriminator, a switching time differentiating circuit and a wave shaping circuit. The alternating current input signal provided to the ballast is rectified by the rectifying circuit to a direct current signal. The square generator generates a square wave signal in reference to the direct current signal. The phase discriminator compares a feedback signal from the wave shaping circuit with a reference signal corresponding to the direct current signal to provide a full-wave rectified signal. The switching time differentiating circuit combines the square wave signal and full-wave rectified signal, and differentiates the combined signal to generate a pair of pulsed signals. The pulsed signals are out of phase with respect to one another. The wave shaping circuit provides a full-wave sinusoidal signal in reference to the pair of pulsed signals to an external circuit and feeds at least a portion of the signal back to the phase discriminator.
Inventors
- 👤 Sung H. Kang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:56
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/26; H05B41/28; H05B41/282; H05B41/2825; H05B41/2828; Y; Y10; Y10S; Y10S315/00; Y10S315/07
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
201 words
An electronic switching ballast for fluorescent lamps, comprising: rectifying circuit means for rectifying an alternating current input signal provided to the input of said ballast to a direct current signal; square wave generator means, coupled to the rectifying circuit means, for providing a square wave signal in response to said direct current signal; phase discriminator means, coupled to the rectifying circuit means, for comparing a feedback signal with a reference voltage in response to said direct current signal to provide a full-wave rectified signal; switching time differentiating circuit means, coupled to the square wave generator and phase discriminator means, for combining said square wave signal and said full-wave rectified signal, and for providing a pair of pulsed signals in reference to said combined signals, said pair of pulsed signals being out of phase with respect to one another; and wave-shaping circuit means, coupled to the switching time differentiating circuit means, for providing a sinusoidal output signal in reference to said pair of pulsed signals to an external circuit, the output of said wave-shaping circuit means being coupled to the input of said phase discriminator means to feed back at least portion of said sinusoidal output signal to the phase discriminator means.
Claim 2
Dependent Claim
201 words
An electronic switching ballast for fluorescent lamps, comprising: rectifying circuit means for rectifying an alternating current input signal provided to the input of said ballast to a direct current signal; square wave generator means, coupled to the rectifying circuit means, for providing a square wave signal in response to said direct current signal; phase discriminator means, coupled to the rectifying circuit means, for comparing a feedback signal with a reference voltage in response to said direct current signal to provide a full-wave rectified signal; switching time differentiating circuit means, coupled to the square wave generator and phase discriminator means, for combining said square wave signal and said full-wave rectified signal, and for providing a pair of pulsed signals in reference to said combined signals, said pair of pulsed signals being out of phase with respect to one another; and wave-shaping circuit means, coupled to the switching time differentiating circuit means, for providing a sinusoidal output signal in reference to said pair of pulsed signals to an external circuit, the output of said wave-shaping circuit means being coupled to the input of said phase discriminator means to feed back at least portion of said sinusoidal output signal to the phase discriminator means.
Claim 3
Dependent Claim
42 words
The electronic switching ballast of claim 1, wherein said switching time differentiating circuit means includes first driver means for providing a first of said pair of pulsed signals, and second driver means for providing a second of said pair of pulsed signals.
Claim 4
Dependent Claim
23 words
The electronic switching ballast of claim 1, wherein said pair of pulsed signals are 180° out of phase with respect to one another.
Claim 5
Dependent Claim
71 words
The electronic switching ballast of claim 2, wherein said wave-shaping circuit means includes first output circuit means coupled to the first driver means for providing a first signal in reference to said first pulsed signal, and second output circuit means coupled to the second driver means for providing a second signal in reference to said second pulsed signal, said first and second signals being combined to constitute said sinusoidal output signal.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1994-04-22 | 1994-10-22 | 1995-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-22 | 1998-10-22 | 1999-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-22 | 2002-10-22 | 2003-04-23 | $7700.00 | Window Closed / Lapsed |