Synchronous rectification duty ratio loss compensation method based on magnetic flux cancellation and converter
A technology of duty cycle loss and synchronous rectification, which is applied in the direction of converting DC power input to DC power output, output power conversion devices, instruments, etc., can solve problems such as synchronous rectifier tube shutdown, and achieve a small number of components and easy implementation , the effect of improving efficiency
Active Publication Date: 2020-07-14
XIAMEN UNIV
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Problems solved by technology
[0009] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a synchronous rectification duty cycle loss compensation method based on magnetic flux cancellation, and a LLC resonant converter with duty cycle loss compensation, which solves the problem of LLC converter The problem of premature shutdown of the synchronous rectifier in the middle and secondary side synchronous rectification circuit improves the efficiency of the converter
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[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0033] In order to solve the problems existing in the prior art, the present invention provides a synchronous rectification duty cycle loss compensation method based on magnetic flux cancellation, and an LLC resonant converter with duty cycle loss compensation.
[0034] The compensation method for synchronous rectification duty cycle loss based on magnetic flux cancellation according to the present invention uses the principle of magnetic flux cancellation to introduce mutual inductance into the voltage detection loop of the synchronous rectification controller and generate specific induced electromotive force to offset the detection The error voltage generated by parasitic inductance or parasitic mutual inductance in the loop compensates for the loss of synchronous rectification duty cycle.
[0035] Based on the synchronous rectification duty...
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The invention relates to a synchronous rectification duty ratio loss compensation method based on magnetic flux cancellation and an LLC resonant converter with duty ratio loss compensation. The methodcomprises the steps: employing a magnetic flux cancellation principle to introduce the mutual inductance into a voltage detection loop of a synchronous rectification controller, and generating a specific induced electromotive force to counteract an error voltage generated by parasitic inductance or parasitic mutual inductance in the detection loop, thereby solving the problem that a synchronous rectification tube in a secondary side synchronous rectification circuit in the LLC converter is turned off in advance, and improving the efficiency of the converter. Compared with other compensation methods, the method just needs only one coil or one turn of wire to be connected in series in the detection loop; the problem of duty ratio loss of a synchronous rectification circuit can be improved only by printing a wire on the PCB without adjusting the structure of the PCB, so the LLC resonant converter disclosed by the invention has the advantages of few required devices, easiness in implementation, suitability for various types of synchronous rectification controllers and the like.
Description
technical field [0001] The present invention relates to the technical field of high-current synchronous rectification on the secondary side of a resonant DC-DC converter, more specifically, to a compensation method for synchronous rectification duty cycle loss based on magnetic flux cancellation, and a method with a duty cycle Loss compensated LLC resonant converter. Background technique [0002] Low-voltage and high-current DC-DC converters often use synchronous rectification technology to reduce the output impedance of the rectification part to improve the efficiency of the converter. Taking the 14V converter as an example, if diode full-wave rectification is used, assuming that the voltage drop of the diode is 0.7V, and without considering the reverse recovery loss, the power loss of the rectification part accounts for at least 5% of the input power. If synchronous rectification is used and the diode is replaced by a controlled MOSFET, the conduction voltage drop generat...
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Login to View More IPC IPC(8): H02M3/335
CPCH02M3/33592H02M1/0009H02M1/0058Y02B70/10
Inventor 何良宗陈嘉哲
Owner XIAMEN UNIV