Electric heating – Microwave heating – With control system
Reexamination Certificate
2007-10-16
2007-10-16
Leung, Philip H. (Department: 3742)
Electric heating
Microwave heating
With control system
C219S716000, C219S718000, C363S017000, C363S098000
Reexamination Certificate
active
10599670
ABSTRACT:
A purpose of the present invention is to provide an inverter circuit capable of firmly turning ON IGBTs under limited condition, while a heat loss and noise can be hardly produced in semiconductor switching elements.In a resonant type high frequency heating apparatus which is arranged by employing a DC power supply; a series connection circuit constructed of two semiconductor switching elements which are connected to the DC power supply; another series connection circuit constituted by a capacitor and a primary winding of a leakage transformer connected to both the terminals of one of the two semiconductor switching elements; and a driving means for driving the respective semiconductor switching elements respectively, a variable dead time forming circuit is provided in the driving means, while the variable dead time forming circuit makes a dead time constant at a switching frequency lower than, or equal to a predetermined switching frequency, and also, rapidly increases a dead time at a switching frequency higher than, or equal to the predetermined switching frequency. Furthermore, when the switching frequency becomes high, a limitation is provided by which the dead time is not further widened.
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patent: 6362463 (2002-03-01), Bessyo et al.
patent: 6624579 (2003-09-01), Yasui et al.
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patent: 2000-58252 (2000-02-01), None
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Kinoshita Manabu
Morikawa Hisashi
Moriya Hideaki
Sakai Shin-ichi
Shirokawa Nobuo
Leung Philip H.
Pearne & Gordon LLP
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