Electric heating – Microwave heating – With control system
Reexamination Certificate
2005-10-17
2008-10-07
Leung, Philip H (Department: 3742)
Electric heating
Microwave heating
With control system
C219S721000, C219S761000, C315S039510, C331S185000
Reexamination Certificate
active
07432484
ABSTRACT:
The invention relates to a high frequency heating apparatus and provides a tracking method of a frequency modulation in order to prevent an extension of the harmonic current component of an oscillation threshold ebm which varies from moment to moment in accordance with a change in the temperature of a magnetron. A driving signal for driving a first semiconductor switching element (3) and a second semiconductor switching element (4) is transmitted to a driving control IC unit (14), and an input reference signal Ref is used to perform an input current fixed control. In this case, a variation amount of the input current of the input reference signal Ref is understood as an accumulation information POW and a constant is optimally configured in a resistor network in an ebm-tracking bias circuit (20).
REFERENCES:
patent: 6215112 (2001-04-01), Kim et al.
patent: 2004/0074900 (2004-04-01), Suenaga et al.
patent: 3-57194 (1991-03-01), None
patent: 2000-058252 (2000-02-01), None
patent: 2004-006384 (2004-01-01), None
Kinoshita Manabu
Moriya Hideaki
Sakai Shin-ichi
Shirokawa Nobuo
Suenaga Haruo
Leung Philip H
Matsushita Electric - Industrial Co., Ltd.
Pearne & Gordon LLP
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