Synchronous voltage modulation circuit for resonant power converter
First Claim
1. A power converter, comprising:
- a transformer having a primary side and at least one secondary side;
at least one electronic switch each of which is connected to the corresponding secondary side;
a resonant controller connected to the primary side;
at least one power output connected to output of the secondary side;
a resonant current extracting unit adapted to couple to the transformer for extracting the resonant current waveform of the transformer; and
at least one duty cycle modulation circuit, each of which is connected to the corresponding power output, and to the resonant current extracting unit, and to the corresponding electronic switches to control a conduction period of the corresponding electronic switches according to voltage of the corresponding power output and the resonant current extracting unit;
wherein each of the at least one duty cycle modulation circuit comprises;
a period modulator, which is connected to the corresponding electronic switches on the secondary side of the transformer; and
an output voltage detector, whose input terminal is connected to the corresponding power output to obtain a voltage variation thereon, and whose output terminal is connected to the period modulator for outputting a relative voltage for the power output to the period modulator, wherein the period modulator further controls the conduction period of each electronic switch according to the relative voltage for the power output.
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Accused Products
Abstract
A synchronous voltage modulation circuit for resonance power converter has a resonance current extracting unit and at least one duty cycle modulation circuit. The resonance current extracting unit extracts the resonance current of the transformer for each duty cycle modulation circuit. The duty cycle modulation circuit controls the conduction period of the electronic switch on the secondary side of the transformer according to the power usage of the load connected to the power output and the resonance frequency of the resonance current on the transformer detected by the resonance current extracting unit. The conduction period increases or decreases symmetrically with respect to the central axis. The power converter output of the resonance power converter converter forms a closed loop control, thereby providing stable power to its load.
30 Citations
26 Claims
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1. A power converter, comprising:
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a transformer having a primary side and at least one secondary side; at least one electronic switch each of which is connected to the corresponding secondary side; a resonant controller connected to the primary side; at least one power output connected to output of the secondary side; a resonant current extracting unit adapted to couple to the transformer for extracting the resonant current waveform of the transformer; and at least one duty cycle modulation circuit, each of which is connected to the corresponding power output, and to the resonant current extracting unit, and to the corresponding electronic switches to control a conduction period of the corresponding electronic switches according to voltage of the corresponding power output and the resonant current extracting unit; wherein each of the at least one duty cycle modulation circuit comprises; a period modulator, which is connected to the corresponding electronic switches on the secondary side of the transformer; and an output voltage detector, whose input terminal is connected to the corresponding power output to obtain a voltage variation thereon, and whose output terminal is connected to the period modulator for outputting a relative voltage for the power output to the period modulator, wherein the period modulator further controls the conduction period of each electronic switch according to the relative voltage for the power output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A power converter, comprising:
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a transformer having a primary side and at least one secondary side; at least one electronic switch each of which is connected to the corresponding secondary side; a resonant controller connected to the primary side; at least one power output connected to output of the secondary side; a resonant current extracting unit adapted to couple to the transformer for extracting the resonant current waveform of the transformer; and at least one duty cycle modulation circuit, each of which is connected to the corresponding power output, and to the resonant current extracting unit, and to the corresponding electronic switches to control a conduction period of the corresponding electronic switches according to voltage of the corresponding power output and the resonant current extracting unit;
wherein each of the at least one duty cycle modulation circuit comprises a period modulator, which is connected to the corresponding electronic switches on the secondary side of the transformer. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification