Full digital electromagnetic heater

Abstract

The invention relates to a full digital electromagnetic heater, which comprises an electromagnetic heating control system. The electromagnetic heating control system comprises a current detection unit (1), a main control unit (2), a pulse generating unit (3) and an inverter unit (4), and the current detection unit (1) samples the working current of an inductive load and sends the sampled current to the main control unit (2); the main control unit (2) controls the pulse generating unit (3) to generate a pulse width according to the magnitude of the sampled current; and the inverter unit (4) controls a switching tube in the inverter unit to open and close according to the magnitude of the pulse width, thus carrying out inversion to generate an alternating voltage acting on the inductive load. In the full digital electromagnetic heater, the main control unit monitors working parameters of the inductive load in real time, realizes automatic sweep frequency and ensures the inductive load to work in a resonance state, thus enhancing the power factor; and the functions of over-current protection, over-voltage protection and over-temperature protection are realized by the full digital control.

Description

technical field [0001] The invention relates to the technical field of electromagnetic heating, and more specifically relates to a fully digital electromagnetic adder. Background technique [0002] In recent years, electromagnetic heating technology has quickly occupied the market with its advantages of high efficiency, energy saving and emission reduction. At present, there are three main topological structures of electromagnetic heaters used in the market: single tube, half bridge and full bridge. For electromagnetic heaters with a single-tube topology, generally pure hardware analog circuits are used for control, such as using a 555 flip-flop, by adjusting the voltage threshold of the control pin of the 555 flip-flop to change the frequency and duty cycle of the pulse width , and then adjust the operating current of the inductive load, and realize automatic protection when the current is too large. However, purely hardware-controlled electromagnetic heaters have some di...

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Problems solved by technology

[0003] 1. The voltage protection is too sensitive when the input voltage fluctuates, which is not conducive to the normal operation of the machine;

[0004] 2. Poor automatic adjustment ability and poor anti-interference ability;

[0006] 4. The constant power protection control is not perfect, and the operation of multiple units is likely to cause interference and cause the machine to blow up

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