Any dual-frequency power signal generating circuit based on voltage superposition principle
A technology of voltage superposition and power signal, applied in induction heating, induction current source, induction heating control and other directions, can solve the problems of inability to adjust arbitrarily, limited frequency of output signal of dual-frequency induction heating power supply, etc.
Active Publication Date: 2018-11-30
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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[0022] 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).
[0023] 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 invention discloses any dual-frequency power signal generating circuit based on a voltage superposition principle. The any dual-frequency power signal generating circuit comprises a full-bridge inverter main circuit direct-current power supply, wherein the full-bridge inverter main circuit direct-current power supply is connected with a full-bridge inverter main circuit; the full-bridge inverter main circuit is connected with a transformer; the transformer is connected with a load circuit; and the transformer is further connected with a positive signal modulation circuit and a negative signal modulation circuit separately. By virtue of the any dual-frequency power signal generating circuit based on the voltage superposition principle disclosed in the invention, the problem that a single inverter dual-frequency induction heating power supply is limited in output signal frequency and cannot be optionally adjusted in the prior art is solved; based on the voltage superposition principle, the output voltages of the positive and negative signal modulation circuits are alternately superposed on positive and negative waveform voltages of a low-frequency square wave signal of the main circuit to synthesize a dual-frequency power signal to be output to a load; and the output voltage frequencies of the positive and negative signal modulation circuits and the main circuit can be independently adjusted, and the harmonic frequency of the synthetic signal can be randomly changed.
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