Digital FM (Frequency Modulation) PLL (Phase-locked Loop) half-bridge serial resonance electromagnetic induction heating power supply
A technology of electromagnetic induction heating and digital frequency modulation, which is applied in the field of electronics, can solve the problems of unstable distance, abnormal continuous heating of induction heating equipment, and failure of normal heating, etc., and achieve reliable results
Inactive Publication Date: 2014-03-26
BEIJING JIUSHUN SCI & TECH
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Problems solved by technology
However, the current induction heating device in the market is difficult to achieve normal heating in engineering due to various reasons. The movement of the heating equipment, etc., causes the induction heating equipment to fail to heat continuously, or even to heat normally, which limits the application of induction heating to a certain extent.
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[0014] Referring to the accompanying drawings, the digital FM phase-locked loop half-bridge series resonant electromagnetic induction heating power supply includes a single-phase or three-phase filter 1, a resonant half-bridge output 2, and FM and AM control 3, which is composed of a band-pass filter and a single-phase or three-phase Phase AC power frequency power supply connection, the filtered single-phase or three-phase AC power frequency voltage is connected to the resonant half-bridge output, the resonant half-bridge output is connected to the frequency modulation and amplitude modulation control, and the single-phase or three-phase half-bridge rectification of the resonant half-bridge output The DC voltage output by circuit D is added to the filter circuit with radiation-proof common-mode inductance, and then the resonant half-bridge output provides super-audio current to the resonant load. The resonant capacitor output by the resonant half-bridge is connected to the heati...
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The invention discloses a digital FM PLL half-bridge serial resonance electromagnetic induction heating power supply which comprises a filter, a resonance half-bridge output and an FM AM (Amplitude Modulation) control. A band pass filter is connected with a three or single phase ac power frequency power supply, the filtered three-phase power frequency power supply is connected to a half-bridge inversion circuit, and a half-bridge output circuit is connected with a master control circuit via a mutual inductor and a PLL circuit. The power supply in a high induction level of the invention can overcome disadvantages in the prior art, normal work of the power supply can be ensured under the condition that the distance between a heated object and a heating coil changes for more than 100mm during work, and power of the power supply timely changes with the distance. A master control portion of the power supply is equipped with two half-adjustable potentiometers Rv1 and Rv2, wherein one of the potentiometers manages power setting of the whole machine, and the other potentiometer is used for adjusting the distance between the heating coil and the heated object (i.e., the coupling tightness of PLL). Thus, practical application of the heating power supply in engineering is well realized.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to a series half-bridge electromagnetic induction heating power supply monitored by a digital frequency-modulation phase-locked loop type frequency-sweeping PLC. Background technique [0002] At present, electromagnetic induction heating has been widely used in the world and at home, such as civil and commercial electromagnetic cookers and industrial, petroleum, chemical, etc., depending on the heating occasion, it may eventually be replaced by electromagnetic induction heating. This work is already in progress. Among them, the reason is: induction heating has high thermal efficiency, energy saving and environmental protection. However, the current induction heating device in the market is difficult to achieve normal heating in engineering due to various reasons. The movement of the heating equipment, etc., causes the induction heating equipment to fail to continue heating norm...
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Inventor 张道春张希民李雷生
Owner BEIJING JIUSHUN SCI & TECH