Arbitrary dual-frequency power signal generation circuit based on the principle of voltage superposition
A technology of voltage superposition and power signal, which is applied in the direction of induction heating, induction current source, induction heating control, etc., can solve the problems that cannot be adjusted arbitrarily, and the output signal frequency of dual-frequency induction heating power supply is limited.
Active Publication Date: 2021-06-15
XIAN UNIV OF TECH
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[0004] The purpose of the present invention is to provide an arbitrary dual-frequency power signal generating circuit based on the principle of voltage superposition, which solves the problem in the prior art that the output signal frequency of a single inverter dual-frequency induction heating power supply is limited and cannot be adjusted arbitrarily
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[0023] The operating frequency of the full-bridge inverter main circuit is f=5kHz, and the power switch tube IGBTG in the positive and negative modulation circuits is respectively a5 and power switch tube IGBT G a6 The trigger frequency is adjusted from 3f (15kHz) to 5f (25kHz).
[0024] figure 2 The output voltage waveform of the base frequency and the triple frequency signal is output for the dual-frequency power signal generating circuit, image 3 It is the output voltage waveform of the base frequency and five times frequency signals output by the dual frequency power signal generating circuit. Depend on figure 2 and image 3 It can be seen that the dual-frequency power signal generation circuit of the present invention can generate arbitrary dual-frequency signal output by simply adjusting the operating frequency of the positive and negative modulation circuits, and the dual-frequency induction heating power supply has more flexible frequency adjustment characterist...
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The arbitrary dual-frequency power signal generating circuit based on the principle of voltage superposition disclosed by the present invention includes a full-bridge inverter main circuit DC power supply, the full-bridge inverter main circuit DC power supply is connected to the full-bridge inverter main circuit, and the full-bridge inverter main circuit The transformer is connected with the transformer, the transformer is connected with the load circuit, and the transformer is also respectively connected with the positive signal modulation circuit and the negative signal modulation circuit. The arbitrary dual-frequency power signal generation circuit based on the principle of voltage superposition disclosed by the invention solves the problem in the prior art that the output signal frequency of a single-inverter dual-frequency induction heating power supply is limited and cannot be adjusted arbitrarily. Using the principle of voltage superposition, the output voltage of the positive and negative signal modulation circuit is alternately superimposed on the positive and negative waveform voltage of the low-frequency square wave signal of the main circuit, and the synthesized dual-frequency power signal is output to the load. The output voltage frequency of the positive and negative signal modulation circuit and the main circuit can be adjusted separately, and the harmonic frequency of the synthesized signal can be changed arbitrarily.
Description
technical field [0001] The invention belongs to the technical field of induction heating power supplies, and in particular relates to an arbitrary dual-frequency power signal generating circuit based on the principle of voltage superposition. Background technique [0002] In the application of induction heating, since the frequency of the current in the induction coil is inversely proportional to the heating thickness (penetration depth) of the workpiece to be heated, the frequency of the current will inevitably affect the distribution of heating power and the heating rate of different parts of the workpiece. Existing studies have shown that , the current frequency in the induction coil is an important factor in determining the heating performance of the workpiece. Therefore, when processing a heated workpiece with complex surface geometry, the inconsistent heating effect of a single frequency induced current on different parts will seriously affect the processing quality of...
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IPC IPC(8): H05B6/04H05B6/06
CPCH05B6/04H05B6/06
Inventor 刘庆丰冷朝霞
Owner XIAN UNIV OF TECH