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Full digital electromagnetic heater

An electromagnetic heater, fully digital technology, applied in induction heating, induction heating control and other directions, can solve the problems of poor automatic adjustment ability, poor anti-interference ability, imperfect constant power protection control, etc., to achieve automatic frequency sweep, improve The effect of power factor

Inactive Publication Date: 2011-02-02
深圳市阿尔法电气技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Examples

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Embodiment approach

[0027] Implementation mode of overcurrent protection: the current detection unit 1 samples the working current of the inductive load L through the sampling resistor R, the short-circuit overcurrent protection circuit in the current detection unit 1 generates a pulse blocking signal when the sampling current reaches the threshold, and the main control unit 2 When the pulse blocking signal is received, the pulse generation unit 3 is controlled to stop generating pulses, and the alarm indication unit 6 is controlled to generate a corresponding alarm indication.

[0028] Implementation mode of overvoltage protection: When the mains voltage input by the power supply is higher than 200V, the voltage across the IGBT Q increases compared with normal conditions, and correspondingly, the bus voltage detected by the voltage detection unit increases, and the sampling The voltage is sent to the main control unit 2, and the main control unit 2 judges and analyzes the voltage value of the sam...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B6/06
Inventor 刘亚军杨泽建陈昌辉冯春静黄绍忠张云祥
Owner 深圳市阿尔法电气技术有限公司
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