Circuit board for IH (Indirect Heating) rice cooker

Abstract

The invention discloses a circuit board for an IH (Indirect Heating) rice cooker, comprising a display circuit board and a control circuit board, wherein the display circuit board comprises an operation display control circuit and a system main control chip MCU (Main Control Unit) which are connected with each other; the control circuit board comprises an electromagnet heating control chip MCU, aworking voltage / current detection circuit, an inner pan temperature detection circuit, a protective detection circuit, an IGBT (Insulated Gate Bipolar Transistor) switch control circuit and a fan switch control circuit, wherein the electromagnet heating control chip MCU serves as the main control chip of the control circuit board; the working voltage / current detection circuit, the inner pan temperature detection circuit, the protective detection circuit, the IGBT switch control circuit and the fan switch control circuit are electrically connected with the electromagnet heating control chip MCU respectively; and the electromagnet heating control chip MCU is connected with the input and the output ends of the system main control chip MCU respectively. The circuit board disclosed by the invention has low development cost and maintenance expense, and is under small interference.

Description

technical field [0001] The invention relates to the field of electric rice cookers, in particular to a circuit board of an IH electric rice cooker. Background technique [0002] The circuit board of the existing IH heating electric rice cooker generally includes a control circuit board and a display circuit board with an operation interface, such as figure 1 The display circuit board mainly includes the system main control chip MCU and the operation display control circuit, the control circuit board mainly includes the IGBT switch control circuit, the fan switch control circuit, the protection detection circuit, the inner pot temperature detection circuit, the working current / voltage detection circuit, etc. , the main control chip MCU of the system is electrically connected to the circuits of the remaining modules above, and controls the actions of the remaining modules above. [0003] In the above circuit structure, the system main control chip MCU mainly realizes the info...

AI Technical Summary

Problems solved by technology

[0003] In the above circuit structure, the system main control chip MCU mainly realizes the information transmission with other module circuits through chip pins and wires, which limits the type selection of the system main control chip MCU, especially in the process of new product development, the operation display The increase in content or the demand for cost will lead to the main control chip with larger or smaller capacity on the circuit board, so that it is necessary to redevelop the control circuit board that matches the selection of the main control chip, resulting in a low degree of standardization and universality of the control circuit board. high development cost

In addition, the connecting wire between the main control chip MCU of the system and the IGBT switch control circuit is long, and the length will increase with the structure of the rice cooker product, which will easily cause excessive interference to the IGBT switch control circuit

Moreover, in the above circuit structure, such as figure 2 It shows that the IGBT switch control circuit is mainly composed of comparators, with many components and components, and the probability of failure is high. When the IGBT switch control circuit fails to be repaired, the entire control circuit board needs to be replaced, and the maintenance cost of the manufacturer is high.

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