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Inversion trigger circuit for induction heating power supply

A technology of induction heating power supply and trigger circuit, which is applied in the direction of converting irreversible DC power input into AC power output, which can solve the problems of load equivalent parameters and natural resonant frequency changes, achieve fast tracking speed, and solve the problem of increasing operating frequency. High and accurate tracking frequency

Inactive Publication Date: 2012-05-16
吴迪
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the trigger control of the inverter bridge composed of turn-off devices, the following problems should be solved: ① During the induction heating process, due to changes in the number and temperature of the heated body, the load equivalent parameters and inherent The resonant frequency changes. Therefore, the inverter trigger circuit must have the function of automatic frequency tracking without phase difference

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  • Inversion trigger circuit for induction heating power supply
  • Inversion trigger circuit for induction heating power supply

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Embodiment Construction

[0008] The invention includes a zero-crossing comparator, an interval sampler, a voltage-controlled oscillator, a signal amplifier, and an active filter. When the voltage Uo at both ends of the resonant capacitor is used as a feedback signal, it is a sine wave that is subjected to amplitude-limited sampling, and is square after zero-crossing comparison. wave, and then input to the non-phase-difference phase-locked loop (PLL) circuit composed of MAX038, so that the output triangular wave and the input square wave can achieve frequency tracking without phase difference (or fixed phase difference), and make the triangular wave and maintain a fixed phase relationship , the amplitude of the output triangular wave remains unchanged, and after being reversed and amplified, two triangular waves with a phase difference of 180 are formed.

[0009] The anti-overcurrent ability of the full control device of the inverter bridge is weak. When the inverter fails or the current is overcurrent,...

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Abstract

The invention relates to a trigger circuit for inversion of an induction heating power supply and relates to a functional generator MAX038, and provides an inversion trigger circuit for an induction heating power supply, wherein the trigger circuit can improve the power, efficiency and working frequency of an inverter. The trigger circuit comprises a zero passage comparer, an interval sampler, a voltage-controlled oscillator, a signal amplifier, an active filter; the structural feature of the trigger circuit provided by the invention is as follows: when voltage Uo of two ends of a resonance capacitor is utilized as a feedback signal, a sine wave is sampled in an amplitude limiting mode to be a square wave after zero passage comparison, and then the square wave is inputted a no phase difference phase locked loop circuit formed by the MAX 038; and output triangular wave and the input square wave realize no discrepant frequency track so as to lead the triangular wave to keep fix phase relation, the amplitude value of the output triangular wave is not changed, thereby forming two ways of triangular wave with phase difference 180 through negation and magnification.

Description

Technical field: [0001] The invention relates to a function generator MAX038, in particular to an induction heating power inverter trigger circuit. Background technique: [0002] In order to make the induction heating power inverter always work in a quasi-resonant or resonant state with a power factor close to 1 or equal to 1, the switching device of the inverter bridge must realize zero-current switching (ZCS) or zero-voltage switching (ZVS). In the trigger control of the inverter bridge composed of turn-off devices, the following problems should be solved: ① During the induction heating process, due to changes in the number and temperature of the heated body, the load equivalent parameters and inherent The resonant frequency changes. Therefore, the inverter trigger circuit must have the function of automatic frequency tracking without phase difference. ②In order to make the inverter device commutate reliably, the triggering of the series resonant inverter must follow the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48
Inventor 吴迪
Owner 吴迪