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Super-wide output voltage range charger based on LLC topology and control method

A technology of output voltage and control method, which is applied in the field of ultra-wide output voltage range charger and control, can solve the problems of rectified voltage oscillation, limit the efficiency of charger, and the charger cannot be used universally, and achieve the effect of reducing turn-on loss

Active Publication Date: 2015-03-25
SHANDONG LUNENG SOFTWARE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the input voltage range of an electric bus is 400V-750V, while the charging voltage range of an electric passenger car is 200V-450V, the chargers of the two cannot be used in common
[0006] 2. The rectifier diode cannot realize ZCS in the whole range
The reverse recovery problem of the rectifier diode on the secondary side makes the rectified voltage oscillate, and the resulting loss will seriously limit the efficiency of the charger

Method used

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  • Super-wide output voltage range charger based on LLC topology and control method
  • Super-wide output voltage range charger based on LLC topology and control method
  • Super-wide output voltage range charger based on LLC topology and control method

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Embodiment Construction

[0048] The present invention is described in detail below in conjunction with accompanying drawing:

[0049] like figure 1 As shown, it is a schematic diagram of the ultra-wide output voltage range resonant converter based on the LLC topology of the present invention. MOS transistors Q1-Q4 constitute a full-bridge inverter circuit, and D1-D4 and C1-C4 are body diodes and diodes of corresponding MOS transistors. Parasitic capacitance; resonant capacitor Cr, resonant inductance Lr (including the leakage inductance of the transformer), and excitation inductance Lm form a resonant network, transformer secondary diodes D5-D8 form a full-bridge rectifier, Cf is a filter capacitor, and RL is a load. Q1 and Q4 use the same trigger pulse, Q2 and Q3 use the same trigger pulse, and Q1 and Q2 are complementary to conduction; there is a certain dead time between the two trigger signals. Realize the ZVS condition of MOS tube. There are two resonant frequencies for the ultra-wide output vo...

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Abstract

The invention discloses a super-wide output voltage range charger based on LLC topology and a control method. The super-wide output voltage range charger comprises an LLC resonant converter and a control circuit. The LLC resonant converter comprises a switch network composed of an MOSFET full-bridge conversion circuit, the input end of the switch network is connected with the input end of a power source, the output end of the switch network is connected with the input end of a resonant network, the output end of the resonant network is connected with a leakage inductor of a transformer, and a secondary side coil of the transformer is connected with a rectifying and filtering network; the control circuit comprises a control unit, the control unit controls MOS tubes of the MOSFET full-bridge conversion circuit to be connected or disconnected according to received signals at the input end and the output end of the LLC resonant converter, and therefore the LLC resonant converter can achieve no-voltage connection of a primary side switch tube and no-current disconnection of a secondary side rectifying diode within a full voltage range. The super-wide output voltage range charger is wide in output voltage, free of limitation of the input voltage range of a charged object and capable of charging various new energy electric vehicles.

Description

Technical field [0001] The invention relates to a full-bridge LLC resonant conversion circuit, and in particular to an ultra-wide output voltage range charger based on LLC topology and a control method. Background technique [0002] In order to solve the environmental pollution problem caused by automobile exhaust, we must accelerate the industrialization of new energy electric vehicles and the construction of charging station facilities. The construction of charging piles must meet the requirements of small size, high power density, and high efficiency to shorten battery charging time. and reduce costs. The LLC resonant converter technology has the advantages of high frequency, high efficiency, integration, and modularity, and has been applied in new energy electric vehicle chargers. [0003] The LLC full-bridge resonant converter can achieve soft switching in the full load range. Currently, most chargers use phase-shifted full-bridge technology. Compared with the phase-sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02J7/00
CPCH02J7/0027H02M3/3353H02J2207/20H02M1/0058
Inventor 刘爱忠万玉超唐亮陈嵩李勇杨勇
Owner SHANDONG LUNENG SOFTWARE TECH
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