Electric cooker and heating control method thereof

Abstract

An electric cooker comprises a pot, a pot cover, an inner pot, a heating device, a control device and a switching power supply. The heating device comprises a relay temperature control mechanism and a thyristor temperature control mechanism. The relay temperature control mechanism comprises a relay and a first heating tube connected with the relay. The thyristor temperature control mechanism comprises a thyristor and a second heating tube controlled by the thyristor. The relay and the thyristor are controlled by the control device. A heating control method includes: setting output power P0; calculating power Pr of the first heating tube under current voltage; calculating difference between P0 and Pr, and converting ratio of the difference to Pt into thyristor-triggered semiwave number; counting the thyristor-triggered semiwave number; and acquiring current required output power. Excessive temperature rising of the thyristor can be avoided.

Description

technical field [0001] The invention relates to an electric cooker and a heating control method thereof. Background technique [0002] At present, smart rice cookers on the market usually use a relay to connect a heating plate, and adjust the average power of the heating plate by changing the duty cycle of the heating cycle of the heating plate according to the food cooking curve prestored in the controller. Or use a thyristor to connect a heating plate, and adjust the power of the heating plate by changing the trigger time of the thyristor according to the food cooking curve pre-stored in the controller. The disadvantages of this temperature control method are: 1. The power output of the heating plate is uneven, and the temperature fluctuates greatly with the opening and closing of the relay. 2. Because the voltage of the mains will fluctuate, even if the food uses the same heating duty cycle, the average power will be different, which will affect the cooking effect. When...

AI Technical Summary

Problems solved by technology

The disadvantages of this temperature control method are: 1. The power output of the heating plate is uneven, and the temperature fluctuates greatly with the opening and closing of the relay

2. Because the voltage of the mains will fluctuate, even if the food uses the same heating duty cycle, the average power will be different, which will affect the cooking effect

When the voltage is too high, because the average power becomes larger, the water in the pot boils too violently, causing the food to rot or even overflow; when the voltage is too low, because the average power becomes smaller, the temperature of the water in the pot is not enough, so the food cannot be cooked properly

3. When the silicon controlled silicon is used alone for temperature control, adjusting the power of the high-power heating element will cause the current passing through the silicon controlled silicon to be too large, resulting in a larger heating loss of the silicon controlled silicon, which requires a larger size radiator to be used together, resulting in the The circuit board must be very large, and the volume of the electric cooker is large

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