Induction cooker surface temperature control circuit and method

A technology of temperature control and induction cooker, applied in the field of induction cooker, can solve the problems of large error, less accurate temperature, large temperature change, etc., and achieve the effect of reducing IGBT temperature, reducing IGBT loss, and realizing zero-crossing start-up.

Pending Publication Date: 2021-05-28
广东顺德锐椒电器有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

This discontinuous heating method is also called intermittent heating. When this 1000W intermittent heating method needs to control the temperature of food or water in the pot, the temperature of the food in the pot changes greatly, usually above 10 degrees, or even larger, and the error is large. Large, can not meet the temperature more accurate requirements

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  • Induction cooker surface temperature control circuit and method
  • Induction cooker surface temperature control circuit and method
  • Induction cooker surface temperature control circuit and method

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Embodiment Construction

[0025] The implementation mode of the present invention is illustrated by specific specific examples below, and those who are familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this description. Obviously, the described embodiments are a part of the present invention. , but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0026] see figure 1 , providing a temperature control circuit for an induction cooker surface, including an EMC protection circuit 1, a rectification filter circuit 2, a zero-crossing detection circuit 3, a resonant circuit 4, an IGBT drive circuit 5 and a main control chip circuit 6; the EMC protection circuit 1 and The rectification and filtering circuit 2 is connected, the zero-crossing detec...

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Abstract

According to the induction cooker surface temperature control circuit and method, a first pin of a triode Q1 in a zero-cross detection circuit is connected with a zero-cross signal receiving pin of a main control chip circuit, a second pin of the triode Q1 is connected with one end of a resistor R2, and a third pin of the triode Q1 is connected with the other end of the resistor R2; one end of the resistor R1 is connected between the third pin of the triode Q1 and the resistor R2, and the zero cross detection circuit is connected between the EMC protection circuit and the rectification filter circuit through the other end of the resistor R1; the preset temperature of the surface of the induction cooker by a user is obtained, the preset temperature and the current temperature of the surface of the induction cooker are judged and compared, and heating control is performed on the temperature in the induction cooker by adopting various power combinations, so that more accurate and more stable temperature is achieved. According to the invention, when power of the induction cooker is relatively low, heating can still be carried out without stopping, so that the temperature of food in a pot can be controlled more accurately and more constantly by utilizing different high and low powers.

Description

technical field [0001] The invention relates to the technical field of induction cooker, in particular to a circuit and method for controlling the surface temperature of an induction cooker. Background technique [0002] The induction cooker is based on the phenomenon of electromagnetic induction, using alternating current to pass through the coil to generate an alternating magnetic field with a constantly changing direction. Eddy currents will appear inside the conductor in the alternating magnetic field (the reason can be referred to Faraday's law of electromagnetic induction), which is eddy current The vortex electric field promotes the movement of carriers in the conductor (electrons in the pot are definitely not iron atoms); the Joule heating effect of the eddy current causes the conductor to heat up, thereby realizing heating. [0003] At present, some electric control schemes of induction cookers adopt a single-tube (single IGBT) parallel resonance scheme. Since the I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D23/20
CPCG05D23/20
Inventor 王波
Owner 广东顺德锐椒电器有限公司
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