Direct-current (DC) - DC converter, power converter and control method thereof

A technology of DC converter and power converter, which is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and controlling/regulating systems, and can solve the problems of low gain, increasingly stringent standards, switching loss and drive To solve the problem of high loss, achieve the effect of meeting loss, improving light load efficiency, and reducing the total number of switching times
CN103138580AActive Publication Date: 2013-06-05DELTA ELECTRONICS (SHANGHAI) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DELTA ELECTRONICS (SHANGHAI) CO LTD
Publication Date
2013-06-05

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Abstract

The invention provides a direct current (DC) - DC converter, a power converter and a control method thereof. The DC - DC converter comprises an output circuit, a rectangular wave generator, a resonance groove, a detection unit and a control unit. The rectangular wave generator comprises a bridge arm which comprises a first switch and a second switch, the first switch and the second switch are connected in an electric coupling mode. The detection unit is used for detecting states of a load, when the load is in a light load state or a zero load state, the control unit controls on and off of the first switch and the second switch through a waviness width modulation mode to convert an input voltage to at least one rectangular wave to be provided for the resonance groove, the duty ratio of the second switch is complementary with that of the first switch, and therefore the gain of the DC - DC converter is enabled to be larger than one. The switch batch-type waviness width modulation control mode works in the light load state and the zero load state, and therefore the total on-off times of the converter in unit time can be effectively reduced, light load efficiency can be effectively improved, and the requirement that loss in the light load state is limited is met.
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Description

technical field

[0001] The invention relates to power electronics technology, in particular to a DC-DC converter, a power converter and a control method thereof. Background technique

[0002] In recent years, due to the widespread implementation of the energy saving movement around the world, more and more customers require switch mode converters to achieve high conversion efficiency in a wide range of loads, so for the converters at light load and no The efficiency of loading time also puts forward high requirements. In this regard, the International Energy Agency (IEA), the United States, Europe and other countries and organizations have formulated or are formulating relevant standards to limit the loss of electrical products such as switch-mode converters at light load and no load.

[0003] The series resonant DC / DC converter adopts resonant conversion technology, which can realize the zero-voltage turn-on of the switch tube, the power loss is very small, and the efficie...

Claims

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