Frequency-variable phase-shifting asymmetric duty-cycle modulation method for series resonant full-bridge converter
A full-bridge converter, duty cycle modulation technology, applied in the direction of converting DC power input to DC power output, instruments, adjusting electrical variables, etc. range and other issues, to achieve the effect of solving easy saturation, facilitating design, reducing volume and cost
Active Publication Date: 2020-02-07
SOUTHEAST UNIV
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Problems solved by technology
However, series resonant full-bridge converters are usually controlled by variable frequency, and the frequency varies widely with the required energy, which leads to design difficulties for magnetic components, especially for high-power transformers that are prone to saturation at light loads , which limits the working range of the converter and increases the size and cost of the transformer
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Embodiment 1
[0020] Embodiment 1: see figure 1 and figure 2 , a series resonant full-bridge converter and its frequency conversion phase-shifting asymmetric duty ratio modulation technology, the modulation technology includes three parts: phase shifting, asymmetric duty ratio and frequency conversion. Wherein the phase shift refers to: the phase shift between the first switching tube Q1 and the third switching tube Q3 is half a switching cycle (0.5Ts), and the phase shifting between the second switching tube Q2 and the fourth switching tube Q4 is half a switching cycle ( 0.5Ts); the first switching tube Q1 leads the second switching tube Q2 by half a series resonance period (0.5Tr), and the third switching tube Q3 leads the fourth switching tube Q4 by half a series resonance period (0.5Tr). Wherein the asymmetric duty cycle means: the duty cycle of the first switching tube Q1 and the third switching tube Q3 are equal and greater than 0.5; the duty cycle of the second switching tube Q2 an...
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The invention discloses a frequency-conversion phase-shift asymmetric duty ratio modulation method for a series-resonance full-bridge converter, and the method comprises the steps: achieving the phaseshift of a half switching period between a first switching tube and a third switching tube, and between a second switching tube and a fourth switching tube, wherein the first switching tube is aheadof the second switching tube by a half series resonance period, the third switching tube is ahead of fourth second switching tube by a half series resonance period, the duty ratios of the first and third switching tubes are equal, and are greater than 0.5, and the duty ratios of the second and fourth switching tubes are equal, and are less than 0.5, and an upper switching tube and a lower switching tube on the same bridge arm are not just complementary; finally adjusting the size of the transmission power of the converter through changing the switching frequency. The phase shifting technologyand the asymmetric duty ratio technology are integrated with the frequency conversion modulation, and the peak of a resonance current can be reduced by 50% or more. Moreover, the maximum values of theexciting current and flux density of a transformer not to be affected by the switching frequency and the power changes, and a difficulty that a conventional series-resonance converter is liable to besaturated under a light load is completely avoided.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a frequency conversion phase-shifting asymmetric duty cycle modulation method of a series resonant full-bridge converter. Background technique [0002] High-voltage pulse power supplies can provide huge pulse energy for laser nuclear fusion, ion beam weapons, high-energy microwaves, MARX generators, radar transmitters, etc. As an important pulse power source, high-voltage pulse power supply has two modes: power frequency and high frequency. Compared with power frequency power, high frequency power has more advantages in terms of efficiency, power density, volume, and quality. With the development of new switching devices and power conversion technologies, high-frequency resonant converters that can realize soft switching have been widely used. Among them, the series resonant full-bridge converter has the characteristics of constant charging current, simple control and ...
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IPC IPC(8): H02M3/335
CPCH02M3/33569Y02B70/10
Inventor 陈武宁光富
Owner SOUTHEAST UNIV