Ripple elimination circuit, ripple elimination method and LED control circuit applying ripple elimination circuit

A ripple elimination and circuit technology, applied in the field of power electronics, can solve problems such as LED current fluctuation, and achieve the effect of good load current, simple and effective control method, and ripple elimination.
CN108513408APending Publication Date: 2018-09-07JOULWATT TECH INC LTD
0 Cites 4 Cited by

Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
JOULWATT TECH INC LTD
Publication Date
2018-09-07

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides a ripple elimination circuit, a ripple elimination method and an LED control circuit applying the ripple elimination circuit. The ripple elimination method comprises the following steps that: the ripple elimination circuit obtains a detection signal representing the voltage at a low potential end of a load, and when the detection signal is less than a first threshold value,load current decreases; when the detection signal is greater than a second threshold value, the load current increases; and when the detection signal is greater than or equal to the first threshold and less than or equal to the second threshold, the load current remains unchanged. The ripple elimination effect is remarkable, and the load current is more stable.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the field of power electronics, in particular to a ripple elimination circuit, a ripple elimination method and an LED control circuit using the same. Background technique

[0002] At present, many AC-DC conversion circuits convert the AC grid input into DC power output with sinusoidal ripples through the LED drive circuit, and the LEDs will have ripples, which will cause damage to human eyes. figure 1 The ripple elimination circuit shown is to filter the ripple on the LED, set the reference voltage Vreg, pull up VC when VD>Vreg, and pull down VC when VD<Vreg, you can adjust the pull-up current i02, i01 and capacitor C02 The size to realize the control of the LED ripple.

[0003] Because the actual power grid will fluctuate, the voltages of VD and VC in the prior art will also fluctuate, causing the current of the LED to fluctuate and causing discomfort to human eyes. The prior art cannot solve this technical problem. Cont...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More