Hardware constant power control circuit and electromagnetic induction heating device

Abstract

The invention relates to the technical field of electronic circuits, disclosing a hardware constant power control circuit and an electromagnetic induction heating device, wherein the hardware constant power control circuit is connected with a main circuit and comprises a current detection circuit, a voltage detection see-sawcircuit and an oscillating circuit, wherein the current detection circuitis used for detecting work current in the main circuit; the voltage detection see-sawcircuit is used for generating comparison voltage; and the oscillating circuit is used for generating oscillating current; the hardware constant power control circuit also comprises an operational amplifier circuit which is provided with a first operational amplifier; an inverted input end of the first operational amplifier is connected with the current detection circuit; a non-inverting input end is connected with the voltage detection see-sawcircuit; and the output end is connected with the oscillating circuit to adjust the conductive duty cycle of the oscillating circuit. The electromagnetic induction heating device adopts the hardware constant power control circuit, thereby improving the response speed and the reliability of the controlling circuit, effectively protecting the circuit components and prolonging the service life of the components.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a hardware constant power control circuit and electromagnetic induction heating equipment using the hardware constant power control circuit. Background technique [0002] Commonly used electromagnetic heating equipment, such as induction cooker, IH rice cooker, etc., all contain constant power control circuits, most of which use software control schemes. The schematic diagram of the principle is as follows: figure 1 shown. First, the current signal of the main circuit is detected by a current transformer, rectified and filtered, and then input to the micro-processing chip MCU for A / D conversion. At the same time, the AC voltage is converted to a DC level, and input to the corresponding MCU for A / D conversion. The MCU calculates the output power of the device, then compares the output power with the set value, and inputs the amplified control signal according to the d...

AI Technical Summary

Problems solved by technology

[0003] The above constant power control scheme adopts software processing to adjust, the signal transmission and processing time is long, and the power adjustment speed is slow. When overcurrent occurs, important components such as transistors will often be burned due to its "inertia", resulting in constant power control effect Unreliable

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