| 摘要 |
An electric heater assembly ( 2 ) for a smooth top cooking appliance comprises first and second heating zones ( 16 and 18 ) provided with first and second heating elements ( 20 and 22 ), respectively, the second heating zone ( 18 ) at least partially surrounding the first heating zone ( 16 ). First and second energy controllers ( 26 and 32 ) energise the first and second heating elements ( 20 and 22 ), respectively, from a power supply ( 28 ). The first heating zone ( 16 ) is operable alone with the first cyclic energy controller ( 26 ) controlling power of the first heating element ( 20 ) at selected settings between a maximum duty cycle and a minimum duty cycle. The first and second heating zones ( 16, 18 ) are operable together such that, in a selected full power operating condition of the assembly, the second cyclic energy controller ( 32 ) energises the second heating element ( 22 ) at substantially maximum duty cycle to provide a substantially maximum power in the second heating zone ( 18 ), and the first cyclic energy controller ( 26 ) energises the first heating element ( 20 ) at less than maximum duty cycle to provide less than maximum power in the first heating zone ( 16 ).
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