Output control system and method of induction heating power supply

Abstract

The invention discloses an induction heating power supply output control method. A control loop and a limit loop are utilized to jointly control the output value of an induction heating power supply, the control loop is used for controlling the output value of the induction heating power supply to increase with the increase of a given input value of the control loop in a non-restriction state; and the limit loop is used for controlling the output value of the induction heating power supply to be stabilized within the output limit value of the limit loop in a restriction state. One limit loop is set corresponding to one restriction condition, the limit loop corresponding to the restriction condition is used for controlling the power supply output as the limit value in the restriction state, and the problem of output jitter in a mode that the control loop output value is directly controlled at present is solved, so that the output of the induction heating power supply can be smoothly adjusted within a full-load range.

Description

technical field [0001] The invention relates to the technical field of a power supply, in particular to an output control system and method of an induction heating power supply. Background technique [0002] Induction heating power supply is an important branch of switching power supply. Due to its high heating efficiency, fast speed, low consumption and environmental protection, induction heating power supply is widely used in various industries. During the use of the induction heating power supply, its output needs to be dynamically controlled according to the load requirements connected to it. The output of the induction heating power supply is controlled by a control loop. When controlling the output of the induction heating power supply according to the load demand, the currently used control method is to directly control the input or output value of the control loop to achieve the purpose of controlling the output of the power supply system. This control method first...

AI Technical Summary

Problems solved by technology

Therefore, the current control method will make the output of the power system fluctuate around the limit value, such as figure 1 shown

The current control method can meet the requirements for the application environment with few restrictions and low output requirements, but it cannot meet the requirements for the application environment with many restrictions or high output requirements, such as pipeline surface heating, material surface treatment, etc. , affected by more restrictive conditions, the output jitter of the power system is more frequent in the restricted state

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