Induction cooker and its ic

Abstract

The invention discloses an induction cooker and an IC (integrated circuit) thereof. The induction cooker comprises a display panel and a power board. The induction cooker is characterized in that the IC of the induction cooker is communicated with a master control single-chip microcomputer by means of single-port digital communication, the IC comprises an adaptive resonant circuit and a power calculation multiplier circuit, an ADC circuit is provided to sample analog quantities of the induction cooker, such as input power, IGBT (insulated gateway bipolar transistor) temperature and cooker-bottom temperature, a DAC circuit is provided to output a cooker power control signal, the power panel of the induction cooker uses the IC, the display panel is provided with a touch key and LED display drive IC, and the display panel is connected with the power panel through three wires.

Description

technical field [0001] The invention relates to the technical fields of an electromagnetic cooker and its IC, a single-port digital communication, a touch key and an LED display driving IC. Background technique [0002] Induction cooker and its IC, there are three known technologies for induction cooker: [0003] The first type uses LM339 four-comparator IC to form an oscillation circuit, drives the IGBT through the triode circuit, and then uses the single-chip microcomputer with ADC function to sample the current and voltage to calculate the power, and the single-chip microcomputer completes the control at the same time; the above-mentioned oscillation circuit does not mention the resonance circuit. The reason is that the low-level duration of the IGBT control gate pulse is a fixed duration determined by the RC delay circuit and will not change with the resonance of the pot. In this way, it is difficult for the IGBT to achieve accurate voltage valley switching, which will r...

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Problems solved by technology

[0003] The first type uses LM339 four-comparator IC to form an oscillation circuit, drives the IGBT through the triode circuit, and then uses the single-chip microcomputer with ADC function to sample the current and voltage to calculate the power, and the single-chip microcomputer completes the control at the same time; the above-mentioned oscillation circuit does not mention the resonance circuit. The reason is that the low-level duration of the IGBT control gate pulse is a fixed duration determined by the RC delay circuit and will not change with the resonance of the pot. In this way, it is difficult for the IGBT to achieve accurate voltage valley switching, which will reduce the efficiency of electric power. The efficiency of its electric power is also aimed at specially equipped pots;

[0004] In the second type, the single-chip microcomputer with ADC function outputs pulses, drives the IGBT through the triode circuit, and then the single-chip microcomputer samples the current and voltage to calculate the power, and the single-chip microcomputer completes the control at the same time; the low-level duration of the IGBT control gate pulse is programmed by the single-chip microcomputer It is determined that it can change with the change of the pot, but because there is no suitable method for detecting resonance, the efficiency of its electric power is similar to that of the first one; at the same time, it is difficult for the single-chip microcomputer to avoid the occurrence of crashes;

[0005] The third type is to use the first type of circuit integrated IC such as LM339 four-comparator IC to form an oscillating circuit, drive the IGBT through the triode circuit, and then use the microcontroller with ADC function to sample the current and voltage to calculate the power. At the same time, the microcontroller completes the control. The current market for this solution is very small, because there is no major improvement over the first solution, and the cost of use has not decreased at the same time

[0013] Known single-port digital communication has an asynchronous digital communication port; it should be more convenient for the main frame to adopt the asynchronous communication port, but it is more complicated to adopt the asynchronous communication port design from the machine; Communication, but using such as I2C communication port, generally at least two-port digital communication instead of single-port digital communication

[0014] Induction cooker or other equipment, the display input board [referred to as the display board] is known to have no touch key IC and LED display driver IC, but a touch key IC and LED display driver IC respectively, and these two ICs generally use such as I2C two-port digital communication; in order to reduce costs, the display board is generally a single-layer PCB board, and there will be two or more wiring centers when the touch key IC and LED display driver IC are used, and there are many wiring crossovers, which increases the complexity of wiring, and Requires many crossovers, which again increases production workload

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