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Electromagnetic heating equipment and heating control system and method thereof

A technology of heating equipment and heating control, applied in the direction of induction heating control, electric/magnetic/electromagnetic heating, induction heating, etc., can solve the problems of high noise, large IGBT turn-on current, and affecting user experience, so as to reduce noise and improve accuracy sexual effect

Active Publication Date: 2021-04-27
FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the stop heating section, due to the existence of the filter capacitor, there is a phenomenon that the IGBT is hard-on when the temperature is measured in the stop heating section.

Method used

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  • Electromagnetic heating equipment and heating control system and method thereof
  • Electromagnetic heating equipment and heating control system and method thereof
  • Electromagnetic heating equipment and heating control system and method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0047] Embodiment one: in accordance with Figure 4 When the method in 4-3 is used to detect the temperature of the pot, if Figure 5 As shown, the whole process can be divided into T1, T0_1 and T0_2, wherein, T1 is the stop phase, at this time the PWM does not output waveforms, after entering the measurement phase, T0_1 is the discharge phase, and the driving circuit 20 outputs the first control signal (such as Figure 5 The PWM waveform in the T0_1 stage shown in 5-2), in order to drive the resonant circuit 10 to perform discharge operation (turn on the IGBT operation), until the voltage at point A drops to UK (that is, the first condition is met), and stop outputting the first control signal. Alternatively, the discharge stage T0_1 lasts for a certain period of time (for example, 1 ms), and the output of the first control signal is stopped. Wherein, in one embodiment of the present invention, the first control signal is a plurality of pulse signals, and the pulse widths of...

Embodiment 2

[0052] Embodiment two: according to Figure 4 When the method in 4-3 is used to detect the temperature of the pot, if Figure 6 As shown, measurements are taken after starting heating one half-wave, with Figure 5 The processing is basically the same, except that before the first control signal stops, a half-wave heating time needs to be maintained to prevent the voltage at point A from being lower than UK during the discharge phase (the lowest point maintains UD, where UD is UK-0.7) Or the time to maintain the voltage at UK is insufficient (due to insufficient discharge capacity, there will be a lag in the time to reach the UK voltage), such as Figure 6 Shown in 6-1.

[0053] The whole process can be divided into T1, T0_1, T0_2, T0_3, T1. Among them, T1 is the stop phase, at this time PWM does not output waveforms, T0_1 is the discharge phase, and the PWM pulse output mode is the same Figure 5 , the stage T0_2 is the heating process, that is, before stopping the output ...

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Abstract

The invention discloses electromagnetic heating equipment and a heating control system and method thereof. The system comprises a resonance circuit, a drive circuit, a first controllable switch, a signal processing unit, and a control unit. The control unit is used for outputting a first control signal to the drive circuit to enable the drive circuit to drive the resonance circuit to perform discharge work when the electromagnetic heating equipment is determined to enter a measurement stage in the process of not performing heating, stopping outputting the first control signal until a first condition is met, and controlling the first controllable switch to be switched on. The signal processing unit outputs a second control signal to the drive circuit, so that the drive circuit drives the resonance circuit to perform self-excited oscillation, and the control unit is further used for acquiring resonance parameters of the resonance circuit in the process of self-excited oscillation of the resonance circuit and determining the temperature of the cookware according to the resonance parameters. Thus, accurate control over the temperature measurement stage of the cookware can be achieved, noise is effectively lowered, and the accuracy of temperature measurement is improved.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a heating control system of electromagnetic heating equipment, an electromagnetic heating equipment and a heating control method of electromagnetic heating equipment. Background technique [0002] In the related art, the method of measuring the temperature of the pan is implemented by measuring the period of the resonant system, and the temperature of the pan is obtained by using the relationship between the preset temperature and its free resonance period. However, due to the existence of the filter capacitor in the heating stop section, the IGBT is hard-on when measuring the temperature in the heating stop section. Contents of the invention [0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, the first object of the present invention is to propose a heating control system for elect...

Claims

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Application Information

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IPC IPC(8): H05B6/06
CPCH05B6/062
Inventor 江德勇王云峰
Owner FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD