Three-level LLC (Logical Link Control) direct-current converter and control method thereof

A DC converter, three-level technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, controlling/regulating systems, etc. The effect of low average current, reduced on-time, and reduced loss

Inactive Publication Date: 2013-01-02
EMERSON NETWORK POWER ENERGY SYST NORTH AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantage is that the time when the inner tube is turned on and the outer tube is turned off is too long. Durin...

Method used

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  • Three-level LLC (Logical Link Control) direct-current converter and control method thereof
  • Three-level LLC (Logical Link Control) direct-current converter and control method thereof
  • Three-level LLC (Logical Link Control) direct-current converter and control method thereof

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Embodiment Construction

[0031] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below in conjunction with the drawings and implementations.

[0032] Embodiments of the present invention provide a three-level LLC DC converter and a control method thereof. The three-level LLC DC converter is controlled in a hybrid control mode of PFM and PWM, and in the PWM state, the inner tube in the converter is connected to the The outer tube is adjusted synchronously. Specifically, the outer tube drive is turned off only a small time earlier than the inner tube drive, such as a dead time, thereby reducing the conduction time of the clamp diode in the clamp circuit and making the clamp The average current that the diode bears is very small, which effectively reduces the loss of the clamping diode.

[0033] The three-level LLC DC converter provided by the embodiment ...

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PUM

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Abstract

The invention relates to the technical field of circuits, and discloses a three-level LLC direct-current converter and a control method of the three-level LLC direct-current converter. The method comprises the following steps of: controlling the converter by a hybrid control manner of a PFM (Pulse Frequency Modulation) and a PWM (Pulse Width Modulation); adjusting the duty ratio of a switch tube of the converter under a PWM state, carrying out synchronous adjusting on the second switch tube and the first switch tube in four switch tubes which are sequentially connected in series, and carrying out synchronous adjusting on a third switch tube and a fourth switch tube. By utilizing the three-level LLC direct-current converter and the control method of the three-level LLC direct-current converter, the consumption of a clamping diode in a clamping circuit can be reduced, and the cost can be further lowered by selecting a diode in a smaller size as well.

Description

technical field [0001] The invention relates to the field of circuit technology, in particular to a three-level LLC DC converter and a control method thereof. Background technique [0002] After nearly 30 years of development, the diode-clamped three-level topology has been widely used in various fields of power electronics technology. The advantage of the diode-clamped three-level topology is that the reverse voltage borne by each switching tube is half of the DC bus voltage, and switching tubes of a lower voltage level can be used to form a converter of a higher voltage level. [0003] Starting from the three-level converter, the three-level technology can be extended to topologies such as buck, boost, and Cuk, which can reduce the voltage stress of FET (Field Effect Transistor, field effect transistor). [0004] In three-level LLC DC converters, PFM (Pulse Frequency Modulation, frequency modulation) and PWM (Pulse Width Modulation, pulse width modulation) control methods...

Claims

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Application Information

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IPC IPC(8): H02M3/28H02M3/335
Inventor 向博
Owner EMERSON NETWORK POWER ENERGY SYST NORTH AMERICA
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