Electric cooker and zero-crossing calibration circuit and zero-crossing calibration method thereof

A technology for calibrating circuits and cookers, which is applied in the direction of measuring current/voltage, instruments, and measuring electrical variables, etc. It can solve the problems of increased heating start current noise and reduced reliability of power switch tubes, etc., to reduce heating start noise, The effect of improving reliability

Active Publication Date: 2018-07-03
FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the zero-crossing point is misjudged, the current noise of the heating and starting of the elec

Method used

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  • Electric cooker and zero-crossing calibration circuit and zero-crossing calibration method thereof
  • Electric cooker and zero-crossing calibration circuit and zero-crossing calibration method thereof
  • Electric cooker and zero-crossing calibration circuit and zero-crossing calibration method thereof

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Embodiment Construction

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0028] The electric cooker and its zero-crossing calibration circuit and zero-crossing calibration method according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0029] figure 1 It is a schematic structural diagram of an electric cooker including a zero-crossing calibration circuit according to an embodiment of the present invention.

[0030] Such as figure 1 As shown, the zero-crossing calibration circuit of the embodiment of the present invention includes a ...

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Abstract

The invention discloses an electric cooker and a zero-crossing calibration circuit and a zero-crossing calibration method thereof. The electric cooker comprises a resonance circuit, a power switch tube and a drive module. The resonance circuit is connected with a collector electrode of the power switch tube, and has a first node. The zero-crossing calibration circuit comprises a zero-crossing detection unit, a resonance voltage detection unit and a control unit, wherein the zero-crossing detection unit is used for detecting a zero-crossing point of an input AC power supply to output a zero-crossing signal; the resonance voltage detection unit is connected with the first node to detect resonance voltage of the first node; the zero-crossing detection end of the control unit is connected withthe zero-crossing detection unit; the AD sampling end of the control unit is connected with the resonance voltage detection unit; and the control unit judges that zero-cross detection is wrong, and carries out processing on the zero-crossing signal in the process where the zero-crossing detection end detects that the zero-passing signal changes from a falling edge to a rising edge, and when the AD sampling end samples the resonance voltage of the first node and the resonance voltage of the first node is larger than a preset voltage.

Description

technical field [0001] The invention relates to the technical field of cooking appliances, in particular to a zero-crossing calibration circuit of an electric cooker, an electric cooker and a zero-crossing calibration method of the electric cooker. Background technique [0002] Electromagnetic induction heating electric cooker has been widely used. For the electromagnetic induction heating control circuit in this type of electric cooker, there is a continuous low-power control method that takes half-wave alternating current as the heating cycle and adopts the method of dropping waves during heating, because the resonance of electromagnetic induction heating needs half-wave alternating current For the frequent start and stop of the cycle, it is necessary to correctly detect and judge the zero-crossing point of the AC power supply. When the zero-crossing point is misjudged, the current noise of the heating and starting of the electric cooker will increase, and the reliability...

Claims

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Application Information

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IPC IPC(8): G01R19/175
CPCG01R19/175
Inventor 雷俊曾露添王云峰卞在银张帆江德勇刘文华黄庶锋瞿月红
Owner FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD
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