| 摘要 |
A dual IH(Induction Heating) circuit controlling apparatus is provided to reduce manufacturing cost and components and to improve efficiency by using one controlling unit for two independent heating coils. A dual IH circuit controlling apparatus includes a first IGBT driving unit(300), a second IGBT driving unit(310), a dual IH controlling unit(200), a micro processor(150), and an output compensating unit(140). The first IGBT driving unit(300) outputs control signals to switch on/off a first heating coil unit(500) heating a cooking vessel according to switching signals. The second IGBT driving unit(310) outputs control signals to switch on/off a second heating coil unit(510) heating the cooking vessel with the same or less output than an output of the first heating coil unit(500). The dual IH controlling unit(200) synchronizes operating time of the second heating coil unit(510) with operating time of the first heating coil unit(500), and outputs operating signals of the first and second IGBT driving units(300,310) to drive the first and second heating coil units(500,510) with the same operating frequency. The micro processor(150) outputs oscillating signals to the dual IH controlling unit(200) to operate at least one of the first and second heating coil units(500,510). The output compensating unit(140) outputs compensating signals to the dual IH controlling unit(200) according to a changing value detected from at least one of a voltage changing value or an output changing value of commercial power to change time for switching one of the first and second heating coil units(500,510). The first and second heating coil units(500,510) have regular switching off time. |
