Dual-frequency induction heating power supply and control method of inverter circuit of dual-frequency induction heating power supply
An induction heating power supply, dual frequency technology, applied in induction heating control, induction heating, induction current source and other directions, can solve the problems of small adjustable range of harmonics, reduced frequency selection performance of resonant circuit, complicated structure of resonant circuit, etc. The effect of increasing the fundamental wave modulation range, simple structure, and expanding the adjustable range of the third harmonic of the output voltage
Inactive Publication Date: 2014-09-17
XIAN UNIV OF TECH
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[0005] The purpose of the present invention is to provide a dual-frequency induction heating power supply, which solves the problems in the prior art that the modulation range of the fundamental wave of the inverter output voltage and the adjustable range of harmonics are small, the structure of the resonant circuit is complex, and the frequency selection performance of the resonant circuit is reduced. The problem
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[0050] DC voltage E=80V, diode-clamped full-bridge multi-level inverter circuit 2 parameters are set as follows: power switch tube switching frequency f=20kHz, voltage dividing capacitor C 1 =C 2 =10mF, the switching angle is set as switching angle-θ 1 =10°, switch angle two θ 2 =62°, single induction coil load circuit 3 parameters are set to: C 3 = 16μF, C 4 =9μF, L 1 = 2.2 μH, L = 1.408 μH.
[0051] image 3 Output voltage waveform for the inverter circuit, Figure 4 is the Fourier waveform of the output voltage of the inverter circuit, Figure 5 is the induction coil current waveform, Figure 6 is the voltage divider capacitor C 1 and the divider capacitor C 2 The voltage waveform of Figure 3-Figure 6 It can be seen that the diode-clamped full-bridge multi-level inverter circuit 2 of the present invention can produce a multi-level voltage signal with dual-frequency power output, and the output voltage contains larger fundamental waves and low-order harmonics; th...
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The invention discloses a dual-frequency induction heating power supply. The dual-frequency induction heating power supply comprises a diode clamping full-bridge multi-level inverter circuit, wherein the diode clamping full-bridge multi-level inverter circuit is connected with a direct-current power supply and a single induction coil load circuit. According to the dual-frequency induction heating power supply, the diode clamping full-bridge multi-level inverter circuit is used for achieving non-superposition type multi-level signal output, the fundamental wave modulation range of inverter output voltage is broadened, the third harmonic adjustable range of output voltage is broadened, and dual-frequency power signals can be generated; the single induction coil load circuit is used for synchronously outputting dual-frequency power signals to accurately select dual-frequency signals, the problems that in the prior art, the fundamental wave modulation range and the harmonic adjustable range of the inverter output voltage are narrow, a resonance circuit is complex in structure, and frequency selection performance of the resonance circuit is reduced are solved, the dual-frequency induction heating power supply is simple in structure, the adjustable characteristic of the dual-frequency power signals of the induction heating power supply is improved, and the energy utilization rate of the dual-frequency power signals of the induction heating power supply is increased.
Description
technical field [0001] The invention belongs to the technical field of induction heating power supplies, and in particular relates to a dual-frequency induction heating power supply based on multilevel technology. The invention also relates to a control method for a diode-clamped full-bridge multilevel inverter circuit. Background technique [0002] Induction heating uses the principle of electromagnetic induction to quickly induce a large eddy current inside the metal material in the alternating magnetic field of the induction coil, thereby heating the material, converting electrical energy into heat energy, and completing the task of heating the workpiece. . According to the relationship between the penetration depth and frequency of induction heating, the heating thickness of the heated workpiece is controlled by the frequency of the induction coil current during the heating process. Therefore, when processing a heated workpiece with an irregular geometric shape on the s...
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IPC IPC(8): H02M7/487H02M7/5387H05B6/06H05B6/04
Inventor 冷朝霞刘庆丰尚麦霞田地
Owner XIAN UNIV OF TECH