[특허]Induction cooking unit having cooking load sensing device and essentially zero stand-by power loss

[미국특허] Induction cooking unit having cooking load sensing device and essentially zero stand-by power loss 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H05B-005/04
출원번호	US-0583662 (1975-06-04)
발명자 / 주소	Peters Jr. Philip H. (Greenwich NY)
출원인 / 주소	Environment/One Corporation (Schenectady NY 02)
인용정보	피인용 횟수 : 41 인용 특허 : 1

초록 ▼

An induction heating unit is provided having an essentially zero stand-by power requirement and comprised by a high power solid-state inverter for supplying relatively high frequency excitation currents to an induction heating coil, and including inhibit, delay, and starting and stopping gating circuits to control the operation of the high frequency power inverter. An induction heating load sensing device senses the presence of a load such as a pan or other metal base cookware located in induction heating relationship with respect to the induction heating coil. The pan presence sensing device comprises a very low power oscillator coupled to a load sensing coil for exciting the load sensing coil with high frequency oscillatory signals which preferably are in the range of two to three times the frequency at which the power inverter operates. The load sensing coil is physically positioned adjacent the induction heating coil in a location to provide inductive coupling of the high frequency sensing signal to a pan load suitably supported near the induction heating coil. The pan load sensing coil is designed to minimize the effect of inductive coupling to the induction heating coil, and for this purpose is provided with a multiple loop figure-eight or cloverleaf shape so designed and positioned that currents induced in the loops of the sensing coil by the magnetic field of the induction heating coil null one another at the terminals of the sensing coil. A load sensing detector responds to the magnitude of the high frequency voltage across the pan load sensing coil and controls the operation of the gating circuits of the power inverter in a load-selective manner to cause turn-on of the power inverter only in the presence of a proper pan load.

대표청구항 ▼

In an induction cooking unit having essentially zero stand-by power requirements and comprising high frequency power inverter circuit means for developing relatively high frequency power excitation currents for supply to an induction heating coil connected to and excited by said high frequency power inverter circuit means and gating circuit means coupled to and controlling operation of the high frequency power inverter circuit means; the improvement comprising induction heating load sensing and control means for sensing the presence of a load located in induction heating relationship with respect to the induction heating coil and for controlling operation of the power inverter circuit means, said induction heating load sensing and control means comprising low power, high frequency electric sensing signal generating means for deriving a high frequency electric sensing signal having a frequency different from that at which the induction heating coil is excited, load sensing coil means coupled to and excited by said high frequency electric sensing signal generating means, said load sensing coil means being physically ositionable adjacent an induction heating coil in a location to provide inductive coupling of the high frequency electric sensing signal to a load being inductively heated and including means for minimizing the effect of inductive coupling from the induction heating coil at the induction heating coil excitation frequency, detector means responsive to the high frequency electric sensing signal derived from said load sensing coil for detecting changes induced in the high frequency electric sensing signal by the presence of an induction heating load, and means for coupling the output from said detector means to control operation of the gating circuit means of an induction cooking unit. An induction cooking unit pan load sensing device for sensing the presence of a pan load located in induction heating relationship with respect to an induction cooking coil, said pan load sensing device comprising low power, high frequency oscillatory sensing electric signal generating means for deriving high frequency electric sensing signal having a frequency different from the frequency at which the induction heating coil is excited, pan load sensing coil means coupled to an excited by said high frequency oscillator sensing electric signal generating means, said pan load sensing coil means being physically positioned adjacent an induction cooking coil in a location to provide inductive coupling of the high frequency oscillatory sensing electric signal to a pan load being inductively heated and including means for minimizing the effect of inductive coupling from the induction cooking coil, pan load sensing detector means responsive to the high frequency sensing electric signal emitted by said pan load sensing coil for detecting changes induced in the high frequency sensing electric signal by the presence of a pan load to be inductively heated, and means for deriving a control output signal from said pan load detector means to control operation of an induction cooking unit.

이 특허에 인용된 특허 (1) 인용/피인용 타임라인 분석

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A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
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연합인증

[미국특허] Induction cooking unit having cooking load sensing device and essentially zero stand-by power loss 원문보기

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이 특허에 인용된 특허 (1) 인용/피인용 타임라인 분석

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[미국특허] Induction cooking unit having cooking load sensing device and essentially zero stand-by power loss 원문보기

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연구과제 타임라인

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이 특허에 인용된 특허 (1) 인용/피인용 타임라인 분석

이 특허를 인용한 특허 (41) 인용/피인용 타임라인 분석

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