Decoupling adjusting method for synchronous dual-frequency induction heating power supply output power
A technology of output power and heating power, applied in induction heating, induction heating control, induction heating device and other directions, can solve the problem of lack of synchronous dual-frequency induction heating power decoupling adjustment method, etc., to achieve a large voltage output range, accurate decoupling The effect of adjustment
Active Publication Date: 2022-08-05
CHONGQING UNIV
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[0007] The defect of prior art is: lack a kind of decoupling adjustment method for output power of synchronous dual-frequency induction heating power supply, through the improved SPWM method for dual-frequency power supply Provide a large voltage output range, and realize precise decoupling adjustment through the voltage amplitude detection method based on phase-sensitive detection technology and PI control method
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[0072] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0073] like Figure 1-Figure 7 As shown, a decoupling adjustment method for the output power of a synchronous dual-frequency induction heating power supply, a dual-frequency power supply based on a full-bridge inverter and a dual-resonant four-element circuit can be used for complex structural metal parts including but not limited to gears The invention discloses a decoupling adjustment method for synchronizing the output power of a dual-frequency induction heating power supply, and the method can realize the accurate adjustment of the dual-frequency power output in a wide range. The whole decoupling method includes improved SPWM modulation method, voltage amplitude detection method based on phase-sensitive detection technology and PI control method.
[0074] 1. The stated PI controller equation:
[0075]
[0076] In the stated PI ...
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The invention discloses a decoupling regulation method for synchronous dual-frequency induction heating power supply output power, which comprises the following steps: step A, a detection module adopts a voltage amplitude detection method based on a phase-sensitive detection technology to sample an output voltage vout of a full-bridge inverter to obtain an intermediate-frequency output voltage Vm and a high-frequency output voltage Vh; b, a control and modulation module obtains a high-frequency output reference voltage Vhr, an intermediate-frequency output reference voltage Vmr, an intermediate-frequency output voltage Vm and a high-frequency output voltage Vh; c, calculating a difference value A between the Vhr and the Vh; calculating a difference value B between the Vmr and the Vm; d, the amplitude K and the phase difference theta of the two sine wave modulation signals are calculated through a PI control method; and step E, two paths of sine wave modulation signals SPWMA and SPWMB are generated through an improved SPWM method to drive the full-bridge inverter to work. According to the invention, accurate decoupling adjustment can be realized through a voltage amplitude detection method based on a phase sensitive detection technology and a PI control method.
Description
technical field [0001] The invention relates to the technical field of heat treatment of metal parts, in particular to a decoupling adjustment method for the output power of a synchronous dual-frequency induction heating power supply. Background technique [0002] To deal with the heat treatment of metal parts with complex surface structures, a dual-frequency induction heating method is proposed. [0003] When induction heating metal workpieces with complex surface structures, due to the different thicknesses of different parts, it is difficult for single-frequency induction heating to meet the process requirements. The dual-frequency power supply can output two alternating magnetic fields with different frequencies through the induction coil, which can form two types of eddy currents with different penetration depths on the surface of the workpiece, thereby achieving uniform heating of the workpiece in a wide range. At present, there have been many papers and patents resea...
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IPC IPC(8): H05B6/06H05B6/10
CPCH05B6/06H05B6/101Y02B70/10Y02P10/25
Inventor 欧阳奇崔越徐永林苑康黄涛
Owner CHONGQING UNIV