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High power electromagnetic oven output power control device

A high-power induction cooker and output power technology, applied in the direction of induction heating control, induction heating devices, household stoves/stoves, etc., can solve the problems of output power fluctuation, IGBT heating, and zero-voltage shutdown can not be guaranteed, so as to achieve low switching loss, The effect of reducing fluctuations and solving heat problems

Inactive Publication Date: 2006-07-12
DICI ELECTRONICS TECH SHANGHAI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different pots will also cause large fluctuations in output power
In addition, the single-tube circuit can only meet the zero-voltage turn-on of the IGBT, but cannot guarantee the zero-voltage turn-off, so the IGBT heats up very seriously when the power output is low, and intermittent heating can only be used when it is unavoidable.
This has a negative effect on the reliable operation of the hob

Method used

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  • High power electromagnetic oven output power control device
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Experimental program
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Embodiment Construction

[0014] Please refer to the attached figure 1 As shown, the main circuit is input by the rectifier circuit 1 and the filter circuit 2, connected to the power switch tubes IGBT1, IGBT2, the power switch tubes IGBT1, IGBT2 are connected to the series circuits LC1, LC2, and the capacitor C is also optional, where L is the furnace The resonant frequency of the coil inductance, the series resonant circuit formed by the capacitors C1, C2 and the inductance L is slightly lower than the driving frequency of the power switch tube. A high-frequency AC detector CT2 is connected in series in the series resonant circuit as a sampling signal of the current closed-loop control circuit, and a DC bus current detector CT1 is connected in series in the DC bus circuit as a power closed-loop control sampling signal.

[0015] The power switch tubes IGBT1 and IGBT2 are driven by a driving circuit 6 , the working frequency of the driving circuit 6 is controlled by the voltage-controlled oscillator 5 ,...

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Abstract

Said invention provides a wide range adjustment output power device for large power electromagnetic oven. Said device is a frequency conversion power adjusting device in peak power output, LC loop being voltage resonance state its resonant frequency a little less than working frequency of power switching tube being inductive load, then increasing loop inductive resistance loop current descent, loop power factor descent furnace output power reducing land In output power descent electromagnetic oven wire coil obtained power descent, inversely reducing loop working frequency be able to raise output power. So the less the output power is, the IGBT heating is reduced, that solves the bottle neck of electromagnetic oven.

Description

technical field [0001] The invention relates to that the output power of a high-power induction cooker can be adjusted in a large range by means of frequency conversion, and at the same time, the ills of heating caused by a sharp increase in switching loss of a power switch tube IGBT under high-frequency operating conditions can be avoided. technical background [0002] At present, most of the single-cooker induction cooker control circuits on the market adopt the single-tube IGBT self-oscillating mode. The control system only uses current cut-off control instead of current-voltage closed-loop control and power closed-loop control, so the control accuracy is very poor. Usually the output power is below 2000 watts, and the power adjustment range is narrow, and the output power will fluctuate with the fluctuation of the grid voltage. Different pots will also cause large fluctuations in output power. In addition, the single-tube circuit can only satisfy the zero-voltage turn-o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B6/06H05B6/12F24C7/08
CPCY02B40/123Y02B40/00
Inventor 蔡志峰
Owner DICI ELECTRONICS TECH SHANGHAI
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