Double-MCU digital PI and PWM control multifunctional welding machine and circuit structure thereof

Abstract

The invention relates to a double-MCU digital PI and PWM control multifunctional welding machine and a circuit structure thereof. A switching power supply circuit is adopted; a control circuit composed by taking the double-MCU digital PI and PWM as a core is adopted, and a hardware circuit is replaced with software as far as possible; and the problem is solved in the mode of dividing circuit boards into power boards and control boards, therefore, output control of two welding methods including manual arc welding and argon arc welding is achieved, the functions of VRD low no-load voltage outputand welding parameter number presetting and displaying are achieved, the problem that the net voltage fluctuation resisting capability of a welding machine is poor is solved, the size of the controlboards and the whole machine is decreased, the weight of the whole machine is decreased, and the power-size ratio of the whole machine is increased. As the integration degree of the control circuit isimproved, connecting wires among the circuit boards are decreased, therefore, the reliability of the welding machine is further improved, and the manufacturing technology of the welding machine is simplified.

Description

technical field [0001] The invention relates to a dual-MCU digital PI and PWM control multifunctional welding machine and its circuit structure, belonging to the technical field of inverter welding machines. [0002] technical background [0003] Inverter welding machines have a large sales volume and a wide range of applications. However, this type of welding machine has different welding methods and functions, different circuit, circuit board and complete machine structural design, different control principles and methods, different layout and connection methods of circuit board and complete machine, or different degrees of complexity of connection, The production process and production process of its products will be completely different. These will affect the performance, reliability, production efficiency and transportation costs of the product, and ultimately affect the market competitiveness of the product. [0004] At present, in the domestic and foreign markets, th...

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Problems solved by technology

[0006] By adopting a switching power supply circuit; adopting a control circuit composed of dual microprocessors as the core, replacing the hardware circuit with software as much as possible; and dividing the circuit board into a power board and a control board to solve the above problems; not only realized The output control of the two welding methods of manual arc welding and argon arc welding, as well as VRD, digital preset and display functions of welding parameters, solve the problem of poor resistance to network voltage fluctuations of the welding machine, and also reduce the size of the control board and the whole machine. The volume reduces the weight of the whole machine and improves the power-to-volume ratio of the welder; due to the increased integration of the control circuit, the connection wires between the circuit boards are reduced, which further improves the reliability of the welder and simplifies the manufacture of the welder craft

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