Topological magnetic integrated converter suitable for LLC resonance series

[0032] Embodiment 1 of the present invention

[0033]Referring to FIG. 6 , it is a schematic diagram of applying the integrated magnetic device of FIG. 2 to a half-bridge LLC resonant converter. Including the DC power supply, the primary side circuit of the LLC resonant converter, the secondary side rectifier filter circuit and the EE integrated magnetic component, it integrates the transformer and the resonant inductor in the traditional LLC resonant converter to obtain the integrated magnetic component. The core material can be selected from various ferromagnetic materials such as ferrite, microcrystalline, ultra-microcrystalline, permalloy, etc. In addition, by customizing the magnetic core, the distance between the two windings bypassed by the primary side can be reduced, and the magnetic column where the winding is located can be reduced. It can be changed flexibly, and the winding can be realized by using flat winding or wound winding.

[0034] The half-bridge LLC resonant converter includes a DC power supply (1), a primary side circuit (2) of the LLC resonant converter, and a secondary side rectification filter circuit (4), wherein the primary side circuit (2) of the LLC resonant converter is powered by the main power The source of the tube (Q1) is connected to the drain of (Q2), the drain of the main power tube (Q1) is connected to the positive pole of the DC power supply (1), and the source of the main power tube (Q2) is connected to the DC power supply (1). The negative pole is formed by connecting one end of the resonant capacitor to the midpoint of the bridge arm; the secondary side rectification and capacitor filter circuit (4) is a diode full-bridge rectification circuit or a full-wave rectification circuit, and the specific composition is: the anode of DR1 is connected to the cathode of DR2, The anode of DR3 is connected to the cathode of DR4, DR1 is connected to the cathode of DR3, DR2 is connected to the anode of DR4, and the filter capacitor (C o ) is connected to the full-bridge rectifier circuit composed of the cathodes of DR1 and DR3; the integrated magnetic component includes a pair of oppositely arranged EE cores and primary windings (N p ), secondary winding (N s ); part of the primary winding (N p ) and all secondary windings (N s ) is wound on the central column, and the other part of the primary winding (N p ) bypass the left column (it can also be wound around the right column, or bypass the left and right columns at the same time), when the converter transmits power to the secondary side, the primary winding (N p ) current inflow point is the same name terminal, which is connected to the negative terminal of the resonant capacitor, the outflow point is connected to the negative terminal of the DC power supply (1), and the two terminals of the secondary winding are connected to the midpoint of the full-bridge rectifier. In addition, the integration method is widely applicable to resonant converters and ZVS phase-shifted full-bridge converters with small secondary side leakage inductance and primary side string inductance.

[0035] Embodiment 2 of the present invention

[0036] Referring to FIG. 7 , it is a schematic diagram of applying the integrated magnetic component of FIG. 2 to a full-bridge LLC resonant converter. Among them, the primary winding (N p ) The current inflow point is the same name terminal, which is connected to the negative terminal of the resonant capacitor, and the outflow point is connected to the main power switch tube Q 1 The source and Q 2 The connection point of the drain, the two terminals of the secondary winding are connected to the midpoint of the full-bridge rectifier, and the outflow point is connected to the main power switch tube Q 1 The source and Q 2 The connection point of the drain, and the two terminals of the secondary winding are connected to the midpoint of the full-bridge rectifier.

[0037] Embodiment 3 of the present invention

[0038] Referring to FIG. 8 , it is a schematic diagram of applying the integrated magnetic component of FIG. 2 to a composite full-bridge three-level LLC resonant converter. Among them, the primary winding (N p ) The current inflow point is the same name terminal, which is connected to the negative terminal of the resonant capacitor, and the outflow point is connected to the main power switch tube Q 5 The source and Q 6 The connection point of the drain, and the two terminals of the secondary winding are connected to the midpoint of the full-bridge rectifier.