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AC (alternating-current)/DC (direct-current) converter

A technology of converters and transformers, which is applied in the direction of instruments, converting DC power input to DC power output, and converting AC power input to DC power output, etc. Bridge loss and other problems, to achieve the effect of reducing the size of the filter, increasing the power density, and reducing the current ripple

Inactive Publication Date: 2011-10-19
EMERSON NETWORK POWER ENERGY SYST NORTH AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The input current flows through the diodes D1~D4 of the rectifier bridge, which makes the loss on the rectifier bridge larger, and it is difficult to further improve the efficiency of the power supply
[0006] 2. The DC / DC converter adopts a phase-shifted full-bridge topology, and the lagging bridge arm is not easy to achieve ZVS
[0007] 3. Since the DC / DC adopts phase-shift control, it is difficult for the output diodes D6 and D7 to achieve zero current switch-off (ZCS for short), and the switching loss on the output diodes is relatively large
[0008] 4. The output has a large inductor, and the power density of the power supply is difficult to increase

Method used

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  • AC (alternating-current)/DC (direct-current) converter
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  • AC (alternating-current)/DC (direct-current) converter

Examples

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Embodiment 1

[0037] Please refer to figure 2 , the AC / DC converter of this embodiment adopts a topology structure of a single-phase bridgeless PFC circuit, a three-phase LLC circuit, a transformer plus a synchronous rectification circuit.

[0038]Among them, the single-phase bridgeless PFC circuit includes a first inductance L1, a second inductance L2, a first follower diode D1, a second follower diode D2, a first PFC switch S1, a second PFC switch S2 and a DC bus Capacitor C1, one end of the first inductance L1 is connected to one end of the AC input power supply AC, the other end of the first inductance L1 is connected to the anode of the first freewheeling diode D1 and one end of the second PFC switch tube S2, and one end of the second inductance L2 is connected to The other end of the AC input power supply AC, the other end of the second inductance L2 is connected to the anode of the second relay diode D2 and one end of the first PFC switch tube S1, and the other end of the first PFC ...

Embodiment 2

[0059] Please refer to Figure 8 , the AC / DC converter of this embodiment still adopts the topological structure of a single-phase bridgeless PFC circuit, a three-phase LLC circuit, a transformer plus a synchronous rectification circuit, but it has the following differences from Embodiment 1:

[0060] 1) The transformer in this embodiment does not use three independent transformers, but a coupled three-phase transformer. The primary side and secondary side of the three-phase transformer adopt a Y-shaped connection mode, and the primary side of the transformer includes the first primary side of the primary side. winding, the second winding of the primary side and the third winding of the primary side, the secondary side of the transformer includes the first winding of the secondary side, the second winding of the secondary side and the third winding of the secondary side, the first winding of the primary side, the second winding of the primary side and the primary side One end ...

Embodiment 3

[0064] Please refer to Figure 9 , the AC / DC converter of this embodiment still adopts the topological structure of a single-phase bridgeless PFC circuit, a three-phase LLC circuit, and a transformer plus a synchronous rectification circuit. connection method. As understood by those skilled in the art, in this case, the three-phase LLC circuit and the three primary windings of the transformer are correspondingly changed to a connection suitable for a △-shaped connection. Similarly, the synchronous rectification circuit and the three secondary windings of the transformer are correspondingly changed In order to adapt to the connection of △-shaped connection.

[0065] Since the topology of the bridgeless PFC circuit plus the LLC circuit is adopted, the AC / DC converter of this embodiment can also obtain high efficiency and high power density of the power supply. In terms of realizing PFC and DC / DC conversion, the basic working principle of the circuit of this embodiment is simil...

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PUM

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Abstract

The invention discloses an AC (alternating-current) / DC (direct-current) converter, comprising a PFC (power factor correction) circuit and a DC / DC converter coupled with one output end of the PFC circuit, wherein the PFC circuit is a PFC circuit without a rectifying bridge; the DC / DC converter comprises an LLC (logical link control) circuit, a transformer and a synchronous rectifying circuit; the output end of the PFC circuit is connected with an input end of the LLC circuit; an output end of the LLC circuit is connected with a primary winding of the transformer; and a secondary winding of the transformer is connected with an input end of the synchronous rectifying circuit. The AC / DC converter can reduce circuit losses and improves power supply efficiency and power density.

Description

technical field [0001] The invention relates to a switching power supply, in particular to an AC / DC (alternating current / direct current) converter. Background technique [0002] For an AC / DC converter, it generally consists of a PFC (Power Factor Correction, PFC) and a DC / DC (direct current / direct current) two-stage circuit. The PFC circuit is used to realize the rectification function and the power factor correction function, so that the input current of the AC / DC converter can track the input voltage on the basis of converting from AC to DC, improve the power factor of the power supply, and reduce the harmonic interference of the power supply. The output terminal of the PFC circuit is connected to the input terminal of the DC / DC converter. The DC / DC converter first converts the direct current into high-frequency alternating current, and then rectifies the alternating current into direct current through diode rectification. [0003] figure 1 The commonly used AC / DC conver...

Claims

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Application Information

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IPC IPC(8): H02M7/155H02M3/315H02M1/42H02M1/12
CPCY02B70/10Y02P80/10
Inventor 弗兰克·赫尔特胡永辉武志贤黄庆义吴云黄立巍
Owner EMERSON NETWORK POWER ENERGY SYST NORTH AMERICA
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