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Switch control method and digital controller

A technology of digital controller and switch tube, which is applied in output power conversion devices, electrical components, conversion of AC power input to DC power output, etc., can solve problems such as reducing circuit efficiency and work efficiency.

Active Publication Date: 2017-10-27
HYNETEK SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] An object of an embodiment of the present invention is to provide a switch control method and a digital controller, which solve the technical problem of reducing circuit efficiency and working efficiency when there is a reverse current in the area near the zero-crossing point of the grid-side voltage in the traditional technology.

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  • Switch control method and digital controller
  • Switch control method and digital controller

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Embodiment Construction

[0042] In order to make the object, technical solution and advantages of the present invention clearer, 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.

[0043] see figure 1 , figure 1 It is a schematic structural diagram of a totem pole bridgeless circuit provided by an embodiment of the present invention. Such as figure 1 As shown, the totem pole bridgeless circuit 11 includes a first bridge arm unit 111 and a second bridge arm unit 112 . The first bridge arm unit 111 and the second bridge arm unit 112 are connected in parallel between the first parallel connection point 11a and the second parallel connection point 11b, and the first bridge arm unit 111 includes the first switch tube Q1 and the second The switch tube Q2, the connection point b...

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Abstract

The invention relates to the technical field of switch time sequence control, in particular to a switch control method and a digital controller, wherein the switch control method is used for a totem pole bridge-free circuit. The switch control method comprises the following steps of obtaining the power supply voltage of a power supply, the load voltage of a load unit and the inductive current of an inductor; respectively calculating the duty ratio M of a main switch tube and a duty ratio N of a synchronous rectifier switching tube according to the power supply voltage, the load voltage and the inductive current; if the sum of M and N is smaller than 1, switching off the synchronous rectifier switching tube. Therefore the reverse current occurring during the light load of the inductive current or the reverse current in a state in a region near the zero-passing point of the net side voltage can be inhibited.

Description

technical field [0001] The invention relates to the technical field of switch timing control, in particular to a switch control method and a digital controller. Background technique [0002] In the energy conversion system, the conversion efficiency of the power supply is very important. Wide bandgap power semiconductors, such as gallium nitride (GaN) and silicon carbide (SiC), have recently gained favor in power conversion applications due to their excellent switching characteristics and increasing quality. Thanks to the advantages of gallium nitride and silicon carbide, the Totem-Pole Bridgeless circuit, as a kind of bridgeless circuit, has the advantages of simple circuit structure and high conversion efficiency, and has become more and more popular in recent years. application. [0003] When the totem pole bridgeless circuit works in continuous conduction mode, its inductor current has a reverse current at light load or in the area near the zero crossing point of the g...

Claims

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Application Information

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IPC IPC(8): H02M1/32H02M7/797
CPCH02M1/32H02M7/797Y02B70/10
Inventor 谢仁践谢小玲蔡永建谢喜忠张秀娟谢仁喜
Owner HYNETEK SEMICON CO LTD
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