Control method for LLC current converter with wide output range

A converter, wide output technology, applied in the control field of LLC converter with wide output range, can solve the problems of large volume and weight, hinder the development of vehicle power supply, and disadvantage the miniaturization design of LLC converter, and reduce the volume and weight, reduce the operating frequency range, and widen the effect of the output voltage range

Inactive Publication Date: 2017-02-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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  • Application Information

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Problems solved by technology

Vehicle power supply products often use LLC circuits. The charging voltage range of conventional batteries is 230Vdc~430Vdc. Frequency modulation control is the most commonly used control method for LLC converters. In order to meet the requirements of a wide output voltage range, the operating frequency range of LLC converters is very wide.

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  • Control method for LLC current converter with wide output range
  • Control method for LLC current converter with wide output range
  • Control method for LLC current converter with wide output range

Examples

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[0018] The present invention will be described in detail below with reference to the accompanying drawings. The invention proposes a control method of a wide output range LLC converter. The topology of LLC converter is as figure 1 shown, v in is the input DC voltage source of the LLC converter, Q `1 -Q 4 for the MOSFET, D 1 -D 4 Anti-parallel diode for MOSFET, L r is the resonant inductance, C r is the resonant capacitor, T is the isolation transformer, D 1 `-D 4 ` is the secondary side rectifier diode of LLC converter, C o is the output filter capacitor of the LLC converter s, R is the equivalent load resistance of the LLC converter, and its value varies with the state of charge of the battery.

[0019] like image 3 Shown is the schematic diagram of the voltage gain curve under the LLC mixed control in the present invention, wherein M min is the minimum voltage gain of the LLC converter working in half-bridge mode under the control mode of the present invention, ...

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Abstract

The invention belongs to the power electronics technological field, and more particularly, to a control method for LLC current converter with wide output range. The method of the invention adopts a control manner for flexibly switching the LLC current converter between a full bridge mode and a half bridge mode, which determines the working mode of the LLC according to the requirement on the output voltage of the LLC current converter. When the output voltage of the LLC current converter is less than the output voltage at the peak of the half bridge LLC current converter, the LLC current converter runs in the half bridge mode; when output voltage of the LLC current converter is greater than the output voltage at the peak of the half bridge LLC current converter, the LLC current converter runs in the full bridge mode. The switching point between the half bridge and the full bridge is where the peak of the gain curve of the half bridge LLC current converter occurs. The invention realizes the ability of the LLC current converter to work in a wide voltage gain and narrow frequency range, which further improves the frequencies of a resonant inductor and an isolating transformer, reduces the sizes and weights of the resonant inductor and isolating transformer, and improves the power density of the LLC current converter.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a control method for an LLC converter with a wide output range. Background technique [0002] At present, LLC (Logical Link Control) converters are widely used in medium and high power AC / DC and DC / DC circuits. power products. Vehicle power supply products often use LLC circuits. The charging voltage range of conventional batteries is 230Vdc~430Vdc. Frequency modulation control is the most commonly used control method for LLC converters. In order to meet the requirements of a wide output voltage range, the operating frequency range of LLC converters is very wide. wide, and the resonant inductor and transformer in the LLC converter must be designed according to the minimum operating frequency, its volume and weight will be very large, which is not conducive to the miniaturization design of the LLC converter, and hinders the direction of high power density of...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M7/48
CPCH02M3/335H02M7/4807H02M7/4815Y02B70/10
Inventor 徐恒山黄永章
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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