Voltage amplitude modulation using rectifier and buck stage to control heater temperature

A control circuit for a resistive heater includes a rectifier configured to receive an alternating current electrical signal from an alternating current power source. A switch is connected to the rectifier. A first diode is connected to the switch and the rectifier. An LC circuit is connected to the switch, the first diode, and the resistive heater. The thermocouple is configured to generate a temperature signal based on a temperature of the resistive heater. The switch controller is configured to: receive the temperature signal from the thermocouple; and generate a switch control signal configured to control a duty cycle of the switch to change power output to the LC circuit. The LC circuit outputs a rectified alternating current electrical signal having a magnitude that varies based on the duty cycle of the switch. 一种用于电阻式加热器的控制电路包含：整流器，其被配置为接收来自交流电源的交流电信号。开关连接至所述整流器。第一二极管连接至所述开关和所述整流器。LC电路连接至所述开关、所述第一二极管以及电阻式加热器。热电偶被配置为基于所述电阻式加热器的温度产生温度信号。开关控制器被配置为：接收来自所述热电偶的所述温度信号；以及产生开关控制信号，其被配置为控制所述开关的工作周期，以改变输出至所述LC电路的