US5600547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inverter circuit utilizing a frequency synchronization device
Assignee: Samsung Electro Mechanics Co Ltd
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Filing: 1995-12-20
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Granted: 1997-02-04
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Expires: 2015-12-20
Abstract
Abstract An inverter circuit that can provide a stable AC power supply by synchronizing the switching operations of a DC-to-DC converter and a DC-to-AC converter which constitute the inverter circuit with each other. The inverter circuit includes an error amplifier for comparing a feedback control voltage from the DC-to-AC converter with a reference voltage and amplifying the resultant voltage of comparison, a frequency synchronizing section for providing a sawtooth voltage synchronized with the frequency of a ripple voltage occurring at an output terminal of the DC-to-DC converter due to the switching operation of the DC-to-AC converter, and a comparator for comparing the sawtooth voltage with the output voltage of the error amplifier, and providing a switching control signal to the DC-to-DC converter as result of comparison.
Inventors
- 👤 Joon H. Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:43
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/337; H02M3/3372; H02M3/3374; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/539; H02M7/5395
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
186 words
An inverter circuit comprising: a DC-to-DC converter for converting an input DC power supply into another DC power supply of a predetermined voltage level; a DC-to-AC converter for converting said DC power supply from said DC-to-DC converter into an AC power supply; feedback means for detecting said AC power supply current from said DC-to-AC converter as a voltage and feeding the detected voltage back to said DC-to-DC converter as a feedback control signal; voltage difference detection means for detecting the voltage difference between the detected voltage and a reference voltage, and amplifying the detected voltage difference with a predetermined amplification factor; frequency synchronizing means, coupled between said DC-to-DC converter and said DC-to-AC converter, for providing a sawtooth voltage synchronized with a frequency of a ripple voltage which is generated at an output terminal of said DC-to-DC converter due to a switching operation of said DC-to-AC converter; and voltage comparing means for comparing said sawtooth voltage provided from said frequency synchronizing means with an output voltage of said voltage difference detection means, and providing a switching control signal to said DC-to-DC converter as a result of comparison.
Claim 2
Dependent Claim
186 words
An inverter circuit comprising: a DC-to-DC converter for converting an input DC power supply into another DC power supply of a predetermined voltage level; a DC-to-AC converter for converting said DC power supply from said DC-to-DC converter into an AC power supply; feedback means for detecting said AC power supply current from said DC-to-AC converter as a voltage and feeding the detected voltage back to said DC-to-DC converter as a feedback control signal; voltage difference detection means for detecting the voltage difference between the detected voltage and a reference voltage, and amplifying the detected voltage difference with a predetermined amplification factor; frequency synchronizing means, coupled between said DC-to-DC converter and said DC-to-AC converter, for providing a sawtooth voltage synchronized with a frequency of a ripple voltage which is generated at an output terminal of said DC-to-DC converter due to a switching operation of said DC-to-AC converter; and voltage comparing means for comparing said sawtooth voltage provided from said frequency synchronizing means with an output voltage of said voltage difference detection means, and providing a switching control signal to said DC-to-DC converter as a result of comparison.
Claim 3
Dependent Claim
50 words
An inverter circuit as claimed in claim 1, wherein said frequency synchronizing means comprises: a capacitor and two resistors for performing charge/discharge operation with respect to said input DC supply voltage; and a diode for providing a current discharged from said capacitor to said output terminal of said DC-to-DC converter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-02-04 | 2000-08-05 | 2001-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-04 | 2004-08-05 | 2005-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-04 | 2008-08-05 | 2009-02-04 | $7700.00 | Window Closed / Lapsed |