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LLC circuit

A circuit and rectifier circuit technology, applied in the field of high-voltage wide-output segmented LLC circuits, can solve problems such as increased loss of the whole machine

Inactive Publication Date: 2014-05-28
XUJI GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide an LLC circuit to solve the problem that the low voltage output frequency is far away from the resonant frequency when the existing LLC circuit is applied to a wide voltage output, which increases the loss of the whole machine

Method used

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Embodiment Construction

[0028] Such as figure 2 As shown, the LLC circuit includes an inverter circuit, a resonant circuit, a transformer and a rectifier circuit connected in sequence. The two ends of the secondary winding of the transformer are connected to the rectifier circuit to form the first voltage output. A joint, the tap is connected to one of the two ends of the secondary winding of the transformer to a rectifier circuit to form a second voltage output. The rectifier circuit is a three-phase full-bridge rectifier circuit, the tap is connected to the middle phase of the rectifier circuit, the two ends of the secondary winding are respectively connected to the bridge arms of the two phases, and one end of the secondary winding is connected through a switch; the switch is a relay or a controllable AC switch.

[0029] There is a switch on the connection between one end of the secondary winding and the input end of the three-phase full-bridge rectifier filter circuit, which is used for switchin...

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Abstract

The invention relates to a LLC circuit which comprises an inverter circuit, a resonance circuit, a transformer and a rectifier circuit, wherein the inverter circuit, the resonance circuit, the transformer and the rectifier circuit are connected in turn. Both ends of a secondary winding of the transformer are connected with the rectifier circuit to form first voltage output. A tap is arranged between both ends of the secondary winding of the transformer. The tap and one of both ends of the secondary winding of the transformer are connected with rectifier circuit to form second voltage output. The transformer adopts a segmented design. The output voltage of a power supply can be divided into a high voltage section and a low voltage section. By changing the turn ratio, the LLC circuit respectively works in two small voltage ranges. The work frequency f of the power supply can change in a small range near respective resonance frequency points fr and fr2, and less deviation is produced, thus the loss can be greatly reduced. The LLC circuit can easily start a continuous mode, which greatly reduces the output ripple.

Description

technical field [0001] The invention relates to a segmented LLC circuit with high voltage and wide output. Background technique [0002] LLC is DC to DC, a kind of main power topology circuit of power supply, has good soft switching characteristics, and is one of the most commonly used circuit topologies in high-power power supply at present. At present, the LLC circuit topology is more common in high-power rectifier circuits. Its excellent soft switching characteristics can greatly reduce the switching loss of the power supply, improve the energy transmission efficiency, and significantly reduce the noise and EMI of the power supply. It is currently the most commonly used large One of the power topologies. [0003] For high-power chargers such as on-board battery chargers, due to the large number of battery models, the charger needs to have a wide output voltage range (the ratio of output high voltage to output low voltage is close to 2) in order to be able to charge vario...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28H02M3/38
Inventor 杨小村陈漫青邓彦彦皇利杰董钦张明冉
Owner XUJI GRP
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