| 摘要 |
A digital control type power converter for cooking utensils includes a rectifier; a power inverting circuit composed of an IGBT and an LC shunt-resonant circuit, wherein the resonant circuit is connected between the rectifier and the source electrode of the IGBT; and a System on a Chip (SoC) chip which internally integrates a Micro Processing Unit (MPU), a Programmable Pulse Generator (PPG), an Analog to Digital Converter (ADC), communication interfaces, and the like, wherein the PPG, the ADC and communication interfaces are connected to the MPU. One output of the MPU is connected to the PPG through a first AND gate, and a pulse signal outputted by the PPG is transmitted to the IGBT through a second AND gate. The MPU calculates the present power value according to measured current and voltage signals, and compares the present power value with the required power of the host computer from communication interfaces to change the setting pulse width value of the PPG. When a magnetic energy conversion detecting circuit outputs an enabling signal, the PPG outputs the pulse signal with the setting pulse width to drive the IGBT and realize the regulation of power. Since this converter can receive man-machine operating instructions and dynamically change its output power, the inductive load structure in the resonant circuit can be appropriately changed to be widely applied to high-frequency heating equipments, such as a micro-wave oven, an electromagnetic oven, and the like. |
