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A single-phase step-down ac-dc converter and its control method

A converter and boost technology, applied in the field of converters, can solve the problems of many components, poor efficiency, large inrush current, etc., to achieve the effect of improving conversion efficiency, good voltage regulation rate, and reducing inrush current

Active Publication Date: 2018-09-11
深圳市拓革科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the defects of large surge current, poor efficiency, and many components in the prior art, and proposes a single-phase step-down AC-DC converter and its control method

Method used

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  • A single-phase step-down ac-dc converter and its control method
  • A single-phase step-down ac-dc converter and its control method
  • A single-phase step-down ac-dc converter and its control method

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0019] The present invention discloses a single-phase step-down AC-DC converter, see image 3 , which includes an EMI filter diode rectifier and a buck-boost converter main circuit connected sequentially from the AC voltage. The main circuit of the buck-boost converter includes a step-down module switch tube Q1 connected to the positive output pole of the diode rectifier and a boost mode switch tube Q2 connected to the negative output pole of the diode rectifier. The converter also includes an input voltage sense circuit connected at the positive output of the diode rectifier through a voltage ...

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Abstract

The invention discloses a single-phase buck-boost AC-DC converter and a control method thereof. The single-phase buck-boost AC-DC converter comprises a diode rectifier and a buck-boost converter main circuit which are connected, wherein the buck-boost converter main circuit comprises a buck module switch and a boost mode switch; and a master controller determines converter working modes according to an input voltage signal, an input current signal and an output voltage signal, controls the buck module switch to be switched only in a buck mode and a buck-boost mode and to be completely conducted in a boost mode, and controls the boost mode switch to be switched only in the boost mode and the buck-boost mode and to be completely cut off in the buck mode. The single-phase buck-boost AC-DC converter has the advantages that the surge current is reduced, the conversion efficiency is improved, conduction losses and switching losses of the switches are reduced, the input voltage range is wide, the response of a voltage circuit does not change along with the change of input voltage, a good dynamic response is maintained in a full-voltage range, and meanwhile, the targets of a high power factor and a good voltage regulation rate are achieved.

Description

technical field [0001] The invention relates to a converter, in particular to a single-phase step-down AC-DC converter and a control method thereof. Background technique [0002] The step-up AC-to-DC converter is the most commonly used pre-stage circuit for switching power supplies (such as figure 1 Shown), to provide the function of adjusting the input power factor (PFC), so that the circuit has a high power factor and low distortion of the input current. However, when the step-up AC-to-DC converter is started, the input voltage will directly charge the large capacitor at the output end, resulting in a large inrush current (Inrush current). Secondly, the output voltage must be higher than the peak value of the input voltage. The application requirements of universal input voltage (universal AC voltage), under low input voltage, the circuit step-up ratio is high, and the efficiency is poor. To overcome this problem, the industry adopts such as figure 2 For the buck-boost...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217H02M3/158
CPCH02M3/1582H02M7/217
Inventor 李光吴国军梅欢欢吴国勇余蓓
Owner 深圳市拓革科技有限公司
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