Isolated resonant converter

Abstract

The invention provides an isolated resonant converter that comprises a first side circuit, a second side circuit and a resonant cavity circuit; the resonant cavity circuit is electrically coupled between the first side circuit and the second side circuit. The resonant cavity circuit comprises a first resonant capacitor, an integrated magnetic element and a second resonant capacitor. The integratedmagnetic element comprises a first side winding and a second side winding. The first resonant capacitor is connected with the first side winding in series; the first side winding and the second sidewinding are connected in series, the second resonant capacitor and the second side winding are connected in series, a spacing groove is formed between the first side winding and the second side winding, and certain leakage inductance energy is stored in the spacing groove to form at least part of resonant inductance required by the isolated resonant converter. According to the isolated resonant converter, the number and/or the size of the magnetic elements and the iron core loss of a transformer are reduced, and the power density and the power supply efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to an isolated resonant converter. Background technique [0002] With the continuous development of switching power supply technology and the continuous development of various new energy generation and electrical equipment, the traditional unidirectional power flow circuit can no longer meet the application requirements. For example, in the application of new energy vehicle on-board charger (OBCM: on Board Charger Modular), it is not only hoped that the on-board high-voltage battery can be charged through the power grid, but also that the on-board battery can be inverted to meet specific power demand or feed back to the power grid. . In addition, in distributed power generation such as solar energy, it is also expected that the solar inverter will generate power to the grid during normal times, and the grid energy can be stored from the grid through the inverter in energy st...

AI Technical Summary

Problems solved by technology

Boost LC can flow bidirectional power. Boost LC circuit only needs LC resonance. When only the resonant cavity is placed on the input side (defined as case 1), and the power flows in the opposite direction, the volt-seconds added to the transformer will be very large, so The structure of the magnetic parts, especially the iron core of the transformer, has a large loss and concentrated heat, making it difficult to dissipate heat

Of course, this Boost LC circuit structure can also be adjusted and transformed, that is, a resonant cavity (inductance L r1 , capacitance C r2 and inductance L r2 , capacitance C r2 ) or hang a resonant cavity on one side (inductance L r1 , capacitance C r1 ) and only hang a resonant inductor L on the other side r2 (defined as case 2), so although the problem of large volt-second transformer in case 1 is effectively reduced, the number of magnetic components is increased to 3, that is, the inductance L r1 , Transformer T X (L m ) and inductance L r2 , the number of magnetic elements is large and the structure is complex

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