Full-bridge LLC circuit

Abstract

The invention discloses a full-bridge LLC circuit. The full-bridge LLC circuit comprises a first module and a second module, wherein each of the first module and the second module comprises a switch bridge arm, a resonant bridge arm, a resonant inductor, a resonant capacitor, a transformer and a rectifier unit. The resonant capacitor in the first module and the resonant capacitor in the second module are connected, so that currents flowing through the resonant inductor of the first module and the resonant inductor of the second module are balanced, current peaks of secondary side output ends of the transformer are consistent, so that currents flowing through the resonant inductors in the full-bridge LLC circuit are balanced and the current peaks of the secondary side output ends of the transformer are consistent, and the MOS in the resonant groove is not burned.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a full-bridge LLC circuit. Background technique [0002] As a kind of soft switching, the resonant converter can use the resonance of the circuit to make the switching element turn on or off when the voltage is zero or the current is zero, so as to reduce the switching loss. Since the LLC resonant converter can not only realize the original The zero-voltage conduction of the side switch tube and the zero-current turn-off of the secondary diode reduce the switching loss. At present, the LLC resonant converter has been widely used in the technical fields of electronics, communication, and electricity. [0003] As the main component of the LLC resonant converter, the LLC resonant circuit has a decisive influence on the performance of the entire LLC resonant converter. An LLC full bridge circuit in the prior art, which connects two LLC resonant circuits in parallel to form a new...

AI Technical Summary

Problems solved by technology

An LLC full bridge circuit in the prior art, which connects two LLC resonant circuits in parallel to form a new LLC full bridge circuit, usually due to the parameter error of the resonant capacitor and resonant inductance in the resonant tank, the upper half of the resonant circuit is caused The current flowing through the resonant inductance of the circuit is unbalanced with the current flowing through the resonant inductance in the lower part, and the peak value of the current output by the secondary side of the two transformers is quite different. This situation is likely to cause the MOS tube in the resonant tank to be burned out. question

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