Control circuit, electronic device and control method thereof

Abstract

The invention discloses a control circuit, electronic equipment and its control method, wherein the control circuit is used to control the communication between n control units and a keyboard, and each control unit includes at least m general input and output ports. Wherein, the control circuit includes: a decoder, m input ports of the decoder are respectively used to connect with m general-purpose input and output ports of each control unit; n control switches, one input / output of the n control switches terminal and the other input / output terminal are respectively connected with n control units and keyboards through the communication bus, and its control terminal is connected with n output ports of the decoder to control the switch according to the output value of the corresponding port of the decoder Controlling is carried out so that at any time, only one of the n control units communicates with the keyboard. Based on the circuit design of the present invention, the purpose of using one keyboard to be compatible with multiple control units can be achieved, thereby saving costs and improving the overall appearance of electronic equipment.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment, and in particular relates to a control circuit, electronic equipment and a control method thereof. Background technique [0002] At present, frequency converters are widely used in many fields such as steel, petrochemical, textile, woodworking, electric power, etc., and the reliability requirements of frequency converters in various fields are also getting higher and higher, which requires the frequency converter to be able to transmit data in real time and accurately to The keyboard lets the user know the current running status of the inverter, and the user can adjust it according to the current running status of the inverter to ensure the stable operation of the inverter. [0003] At present, inverter keyboards are divided into LCD liquid crystal display keyboards and LED digital tube display keyboards according to the display mode; according to whether the main control chip MCU (M...

AI Technical Summary

Problems solved by technology

[0004] In the existing design of all-in-one frequency converter, the application scheme of the keyboard can be divided into two categories: one is to equip each control unit with a keyboard independently. This scheme is simple, but it will increase the cost. At the same time, it is not conducive to the appearance design of the whole machine

The other type is to use only one keyboard, and the connection topology is divided into two types: one is to add the main control chip and circuit in the keyboard, the keyboard is used as the master station of the bus communication, and the control unit in the all-in-one inverter is used as the slave Station, this solution has the disadvantages of high cost and complicated control methods; the other is that the keyboard is connected to a control unit of the frequency converter, and the control unit uses a control chip with rich peripherals or a general-purpose I / O port. The unit is connected to the aforementioned control unit, and the data interaction between the keyboard and other control units needs to be converted through the aforementioned control unit, which also has the disadvantages of high cost and complicated control methods

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