公开(公告)号：US3770928A

公开(公告)日：1973-11-06

申请号：US3770928D

申请日：1971-12-27

Applicant: GEN ELECTRIC

Inventor： KORNRUMF W ,  HARNDEN J

IPC: H02M5/45 ,  H02M7/523 ,  H02M7/525 ,  H05B6/06 ,  H05B5/04

CPC classification number: H05B6/062 ,  H02M5/45 ,  H02M7/523 ,  H02M7/525

Abstract: A smooth-top cooking appliance for inductively heating cooking utensils comprises a flat induction heating coil driven at an ultrasonic frequency by a solid state inverter. The control circuit for the inverter is suitable for fabrication as an integrated circuit and includes, in addition to turn-on circuitry, protection circuits to assure reliable and automatic operation under abnormal circuit conditions such as overvoltages and low input voltages tending to cause device and power circuit failures. The control circuit also includes a utensil presence detection circuit to assure operation under load and no-load conditions. Voltage responsive sensors such as Zener diodes sense the appropriate voltages at selected points on the power circuit and modify the operation of the control circuit, preferably by over-riding and inhibiting the turn-on circuitry. Disclosed with regard to a one-thyristor, variable frequency series resonant inverter with an added maximum frequency control, the protection circuit technique is applicable to inverters generally.

Abstract translation: 用于感应加热烹饪用具的平顶烹饪器具包括通过固态逆变器以超声波频率驱动的平面感应加热线圈。 逆变器的控制电路适用于作为集成电路的制造，并且除了导通电路之外还包括保护电路，以在诸如过电压和低输入电压的异常电路条件下确保可靠和自动的操作，以期导致器件和功率 电路故障。 控制电路还包括用于存储检测电路，以确保在负载和空载条件下的操作。 诸如齐纳二极管之类的电压响应传感器感测电源电路上选定点处的适当电压，并且优选地通过覆盖和禁止接通电路来修改控制电路的操作。 关于具有附加的最大频率控制的单晶闸管，可变频串联谐振逆变器，保护电路技术通常适用于逆变器。