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21. 发明授权

US4112287A Central oscillator for induction range using triac burner controls 失效
标题翻译：用于感应范围的中央振荡器，使用三端双向可控硅开关控制器
公开(公告)号：US4112287A
公开(公告)日：1978-09-05
申请号：US738904
申请日：1976-11-04
申请人： Robert M. Oates , Theodore M. Heinrich
发明人： Robert M. Oates , Theodore M. Heinrich
IPC分类号： H05B6/12 , H02M5/27 , H02M7/523 , H03B1/02 , H05B6/06 , H05B5/04
CPC分类号： H05B6/065 , H02M5/27 , H02M7/5236
摘要： An apparatus for inductively heating cooking utensils comprising four induction cooking coils excited by a central power oscillator providing an alternating sinusoidal excitation voltage at about 25 kilohertz which is 100% amplitude modulated at 120 hertz. Power to the four induction coils is duty cycle controlled by four 60 hertz triacs each series inserted between the power oscillator and a respective one of the induction coils. The triacs switch to excite their respective induction coils only at the zero point of the excitation voltage modulation envelope. Line power fluctuations are minimized by sequential switching of the triacs in a manner that results in an effective power switching frequency of approximately 46 hertz when all four induction cooking coils are excited. The central power oscillator is inherently protected from high Q load conditions without the provision of feedback loops.
摘要翻译：一种用于感应加热烹饪器具的装置，包括由中心功率振荡器激励的四个感应烹饪线圈，所述中心功率振荡器在大约25千赫兹提供交替的正弦激励电压，其以120赫兹100％振幅调制。四个感应线圈的功率由四个60赫兹三端双向可控硅开关控制，每个串联插入功率振荡器和相应的一个感应线圈之间。三端双向可控硅开关仅在激励电压调制包络的零点处切换以激励它们各自的感应线圈。当所有四个感应烹调线圈被激励时，通过顺序切换三端双向可控硅开关的方式使线功率波动最小化，导致大约46赫兹的有效功率开关频率。中央功率振荡器固有地保护免受高Q负载条件的影响，而不需要提供反馈回路。

22. 发明授权

US4085300A Frequency controlled induction cooking apparatus 失效
标题翻译：频率感应加热烹调器
公开(公告)号：US4085300A
公开(公告)日：1978-04-18
申请号：US682489
申请日：1976-05-03
申请人： Raymond W. MacKenzie , Peter Wood , Theodore M. Heinrich , Robert M. Oates
发明人： Raymond W. MacKenzie , Peter Wood , Theodore M. Heinrich , Robert M. Oates
IPC分类号： H05B6/06 , H05B5/04
CPC分类号： H05B6/062
摘要： The invention relates to induction heating for cooking. Solid state reciprocal power switches are used to excite a resonant power output circuit including an induction coil to be inductively coupled to a cooking utensil. A first control signal which is a function of the Q of the coil, the direct current voltage applied to the power switches and the frequency of operation of the power switches is used to offset the power circuit from oscillating at resonance in order to control the power output. A solid state differential circuit is used responsive to a second control signal establishing the level of power desired and to the first control signal for regulation about the selected power level. The same differential circuit is responsive to a third control signal to insure low starting power or in case of a failure of the power line. Minimum power output is provided at the lower end of the ultrasonic frequency spectrum without entering the audible frequency range.
摘要翻译：本发明涉及用于烹饪的感应加热。固态互逆功率开关用于激励包括感应线圈耦合到炊具的感应线圈的谐振功率输出电路。使用作为线圈的Q的函数的第一控制信号，施加到功率开关的直流电压和功率开关的操作频率来抵消谐振时的电源电路振荡，以便控制功率输出。固态差分电路用于响应建立期望功率的第二控制信号和第一控制信号，以便调节所选择的功率电平。相同的差分电路响应于第三控制信号以确保低启动功率或在电力线路故障的情况下。在超声波频谱的下端提供最小功率输出，而不会进入可听频率范围。

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