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Digital DC/DC flyback converter without optical coupling isolation

A flyback converter and optocoupler isolation technology, which is applied in the direction of conversion equipment with intermediate conversion to AC, can solve the problems of difficult adjustment of controller parameters and output voltage, aging components, unstable temperature drift loop, etc. Achieve the effect of overcoming loop instability, increasing output power, and avoiding output voltage instability

Inactive Publication Date: 2009-01-14
SHENZHEN AEROSPACE NEW POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problems in the existing analog control loop, such as component aging, loop instability caused by temperature drift, controller parameters and output voltage are difficult to adjust, etc.

Method used

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  • Digital DC/DC flyback converter without optical coupling isolation
  • Digital DC/DC flyback converter without optical coupling isolation
  • Digital DC/DC flyback converter without optical coupling isolation

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Embodiment Construction

[0027] The present invention is described below in conjunction with accompanying drawing:

[0028] see figure 1 The digital DC / DC flyback converter without optocoupler isolation and the design method thereof in the present invention have a schematic block diagram of the digital DC / DC flyback converter without optocoupler isolation, such as figure 1 As shown, the present invention is a digital DC / DC flyback converter without optocoupler isolation, and the digital DC / DC flyback converter without optocoupler isolation includes: a digital control unit 1, a primary switch unit 2, an input Busbar unit 17, isolated transformer unit 3, secondary side rectifier unit 4, isolated drive unit 5, energy storage filter unit 6 and load 7, wherein the digital control unit 1 is connected to the primary side switch unit 2 and the isolated The drive unit 5 is connected; the primary switch unit 2 is connected to the isolation transformer unit 3; the isolation transformer unit 3 is connected to th...

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PUM

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Abstract

The invention relates to a digital DC / DC flyback converter without optical coupling isolation comprising a digital control unit, a primary side switch unit, an input bus unit, an isolated variable voltage unit, a secondary side rectify unit, an isolated drive unit, an energy storage filtering unit and a load. The flyback converter samples the output voltage by increasing a feedback winding in the isolated variable voltage unit without feedback by optical coupler, which solves the problem of unstable output voltage brought by the nonlinear drift along the temperature of the optical current transfer ratio. The secondary side rectify unit adopts MOSFET tube instead of the rectifier diode, which improves the output power of the flyback converter, realizes the closed loop control by digital technique, overcomes the problems of the aging components in the simulation control loop, the unstable loop caused by temperature drift and that the controller parameter and the output voltage is not easy to regulate or the like, has advantages of high reliability, flexible design or the like.

Description

technical field [0001] The invention belongs to digital control technology, in particular to a digital DC / DC flyback converter and circuit without optocoupler isolation. Background technique [0002] Isolated switching converters can protect loads from high voltage surges and damage to the input bus, and are widely used in telecom wireless networks, automobiles, and medical equipment. Since the flyback converter topology has no output filter inductance, the circuit structure is simple, the output is isolated, and it occupies a high proportion in the application of terminal equipment. [0003] The sampling signal of the output voltage in the isolated converter can adopt two ways of optocoupler feedback and magnetic feedback. [0004] The optocoupler isolation is most widely used in the prior art, and the optocoupler feedback speed is fast, the circuit design is simple, and the cost is low. However, since the current transfer ratio of the optocoupler varies greatly with exte...

Claims

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Application Information

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IPC IPC(8): H02M3/28
Inventor 张东来王毅姚雨迎王骞赵敏
Owner SHENZHEN AEROSPACE NEW POWER TECH
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