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A high and low voltage switching circuit with llc conversion output

A high and low voltage switching and circuit technology, which is applied in the direction of output power conversion device, DC power input conversion to DC power output, electrical components, etc., can solve the problem of non-adjustable output voltage of LLC converter, and solve the problem of non-adjustable output voltage Effect

Active Publication Date: 2019-07-26
XJ POWER CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a high and low voltage switching circuit for LLC conversion output, which is used to solve the problem that the output voltage of the above-mentioned LLC converter cannot be adjusted

Method used

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  • A high and low voltage switching circuit with llc conversion output
  • A high and low voltage switching circuit with llc conversion output
  • A high and low voltage switching circuit with llc conversion output

Examples

Experimental program
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Embodiment 1

[0020] A high and low voltage switching circuit for LLC conversion output provided by this embodiment, its schematic diagram is as follows figure 2 As shown, where T is a transformer, switching tubes Q1, Q2, Q3 and Q4 form a bridge inverter circuit, the AC side of the inverter circuit is connected to the primary side of the transformer T through an oscillation circuit formed by capacitor Cr and inductor Lr in series. The secondary side of the transformer T has two coils, where the secondary side of the first coil is connected to the AC side of the first rectifier composed of diodes D1, D2, D3 and D4, and the secondary side of the second coil is connected to the AC side of the first rectifier composed of diodes D5 , the AC side of the second rectifier composed of D6, D7 and D8. In this embodiment, the selector switch adopts a single-pole double-throw relay REL, its static point 4 is connected to the output terminal V+, its moving point 1 is connected to the high-voltage end of...

Embodiment 2

[0023] A high and low voltage switching circuit for LLC conversion output provided by this embodiment, its schematic diagram is as follows image 3 As shown, its circuit structure is the same as the high and low voltage switching circuit of the LLC conversion output provided in Embodiment 1, the difference is that switch K is used as the selection switch in this embodiment. The selector switch K includes three single-pole double-throw switches, the static points of which are contact 11, contact 21 and contact 31 respectively, the moving points of the first single-pole double-throw switch are contact 12 and contact 13, the second The moving points of the SPDT switch are contact 22 and contact 23, and the moving points of the third SPDT switch are contact 32 and contact 33. Among them, the contacts 11, 21 and 31 are respectively connected to the high voltage end of the first rectifier DC side, the high voltage end of the second rectifier DC side and the low voltage end of the se...

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Abstract

The invention relates to a high and low voltage switching circuit for LLC conversion output, comprising an output terminal, n secondary sides of transformers and n rectifiers, wherein n is greater than 1; both ends of the secondary side of the nth transformer are connected to the AC side of the nth rectifier; The low-voltage end of the DC side of the mth rectifier is connected to the high-voltage end of the m+1th rectifier's DC side, where 0

Description

technical field [0001] The invention relates to the technical field of output control of LLC converters, in particular to a high and low voltage switching circuit for LLC converter output. Background technique [0002] At present, in order to support new energy vehicles with "zero emission and zero pollution", the State Grid Corporation of China vigorously promotes the development of electric vehicle charging stations. High-power chargers have put forward extremely high requirements for reliability and power density. DC / DC conversion uses more LLC resonant conversion topology and phase-shifted full-bridge conversion topology. The phase-shifted full-bridge ZVS loses the effective duty cycle due to the addition of a resonant inductance on the primary side, and the diode on the secondary side has a large Large reverse recovery loss, power density and efficiency are difficult to greatly improve. The LLC converter topology can realize ZVS originally, and the secondary rectifier ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCH02M1/00H02M3/3353H02M1/0003H02M1/0083
Inventor 李彩生朱子庚曹亚徐亚超韩海伦王攀攀董钦黄栋杰邓长吉单栋梁刘向立李杰胡永华
Owner XJ POWER CO LTD