US4555608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inverter device for induction heating
Assignee: Panasonic Holdings Corp
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Filing: 1982-11-02
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Granted: 1985-11-26
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Expires: 2002-11-02
Abstract
Abstract An induction heating device makes use of a bridge inverter and has a DC power source, a plurality of switching elements forming a bridge inverter, and a circuit for detecting the turn-off of the switching elements. In order to detect the turn-off of the switching elements, an improved turn-off detection circuit is employed and an improved control circuit is installed to prevent the circuit from malfunctioning owing to external noise.
Inventors
- 👤 Takumi Mizukawa
- 👤 Yoshio Ogino
- 👤 Hideki Ohmori
- 👤 Taketoshi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:36
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/06; H05B6/062
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
126 words
An inverter device for induction heating, comprising a bridge inverter having a pair of series-connected switching elements connected to a DC power source and having an output obtained from a junction between said switching elements, a circuit for detecting the turn-off of said switching elements comprising a voltage comparator having one input terminal connected to said junction and another input terminal connected to said DC power source wherein said turn-off is detected when the voltages at said one and another input terminals become equal, and a timing circuit and a flip-flop circuit which are connected to an output of said turn-off detection circuit, the arrangement being such that after the turn-off of one of said switching elements has been detected, the other switching element is driven.
Claim 2
Dependent Claim
126 words
An inverter device for induction heating, comprising a bridge inverter having a pair of series-connected switching elements connected to a DC power source and having an output obtained from a junction between said switching elements, a circuit for detecting the turn-off of said switching elements comprising a voltage comparator having one input terminal connected to said junction and another input terminal connected to said DC power source wherein said turn-off is detected when the voltages at said one and another input terminals become equal, and a timing circuit and a flip-flop circuit which are connected to an output of said turn-off detection circuit, the arrangement being such that after the turn-off of one of said switching elements has been detected, the other switching element is driven.
Claim 3
Dependent Claim
79 words
An inverter device for induction heating as set forth in claim 1, wherein said output of said turn-off detection circuit is connected to said timing circuit and flip-flop circuit through an inhibition circuit, an inhibition input terminal of said inhibition circuit being fed with a signal used for driving said pair of switching elements, the arrangement being such that while one of said switching elements is being driven, the generation of signals by said turn-off detection circuit is inhibited.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |