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A digital controller based on ac-dc isolated converter with output constant current

A digital controller, isolation technology, applied in the direction of conversion equipment with intermediate conversion to AC, irreversible AC power input to DC power output, etc., can solve the problem of no advantage in accuracy, reduce large area, eliminate light Coupling isolation device, area saving effect

Active Publication Date: 2015-09-02
ZHEJIANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although the digital implementation method has no advantage in accuracy compared with the traditional analog method, the above-mentioned advantages make digital implementation more and more popular among designers, and how to make up for the accuracy problem of digital implementation has become a hot research. topic

Method used

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  • A digital controller based on ac-dc isolated converter with output constant current
  • A digital controller based on ac-dc isolated converter with output constant current
  • A digital controller based on ac-dc isolated converter with output constant current

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Embodiment Construction

[0033] In order to describe the present invention more specifically, the technical solutions and related principles of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] image 3 The LED drive circuit based on AC-DC Flyback isolation conversion is shown. The AC input passes through the rectifier, and an approximate DC voltage V is obtained under the action of a large capacitor. dc . digital controller through a sense resistor R sense Sampling the peak current signal I of the primary side of the LED drive circuit sense , to achieve peak current control; at the same time, the digital controller passes through the auxiliary winding N aux and resistor divider will output the voltage V o Reduced by a certain percentage, its sampling resistor R f2 The voltage on V sense That is, it includes the output voltage information of the LED drive circuit.

[0035] like Figure 4 As shown, the digita...

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Abstract

The invention discloses an output constant current-based digital controller of an AC-DC (alternating current-direct current) isolated converter. The digital controller comprises a voltage detecting unit, a current threshold calculating unit, a delay compensation calculating unit, a peak current comparing unit, a PWM (Pulse-Width Modulation) generating unit and a driving unit. In the digital controller, according to the inherent characteristic of a Flyback isolated topology structure and on the basis of the traditional AC-DC isolated converter, the original side peak current is sampled, and the auxiliary winding voltage is sampled, so that a coupling isolating device is eliminated, and the cost is reduced; the rising digital control technology is adopted to substitute the traditional analog control technology, constant current control is ingeniously realized through the special powerful operational capability of digital control, and the large area occupied by analog control is reduced; and in order to overcome the deficiency of control precision in the digital control way, a switch tube driving circuit delay compensation unit is introduced to improve output current precision.

Description

technical field [0001] The invention belongs to the technical field of converter control, in particular to a digital controller based on an AC-DC isolated converter with output constant current. Background technique [0002] Because power electronics technology itself has many advantages such as high energy density, high efficiency, and high controllability, its technology has been used more and more in the field of traditional energy and new energy. LED lamps are gradually replacing traditional incandescent lamps due to their advantages of high efficiency and energy saving. Regardless of whether it is a family or a large public place, LED lighting is used more and more widely, and LED driver design technology is constantly being proposed. Most of the main circuits of traditional LED drivers use AC-DC isolation conversion circuits. [0003] The luminous characteristics of the LED are completely determined by the current of the LED. In order to ensure the stability and brigh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/12H02M3/28
Inventor 刘侃何乐年邱建平
Owner ZHEJIANG UNIV
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