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High-performance current-type multi-switching LED controller

A LED controller, current-type technology, applied in the field of high-performance current-type multi-cut LED controller, can solve the problems of complete machine burnout, high constant current accuracy, low PF value, etc., to reduce system cost and system size , the effect of integration costs

Active Publication Date: 2015-04-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There are three types of current LED drive technologies: one is the resistance-capacitance circuit, the disadvantage is that the constant current accuracy is not high, and it is only suitable for below 5W; the cost is low, and the efficiency is as high as about 95%; the size is moderate but the reliability is poor, and the whole machine is prone to burnout
The second is switching power supply, the disadvantage is that the constant current has high precision and can work in a wide range; high cost, high efficiency, serious EMI, large ripple; large size
The third is segmental linearity. The disadvantage is that the constant current accuracy is high, and it is not suitable for a certain voltage range like the resistance and capacitance; the cost is moderate, the efficiency is low, the ripple is small, but the utilization rate of the lamp beads is low; the size is small
In short, the disadvantage of the existing technology is that it does not adopt the multi-cut method: low efficiency, low PF value, no series capacitor, low efficiency, and cannot adapt to narrow input voltage changes, and the ripple is large; only the voltage method is used for judgment, and it cannot adapt to the input voltage. Variation: Cannot accommodate narrow input voltage variations

Method used

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  • High-performance current-type multi-switching LED controller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] see figure 1 , including an input rectification unit, a voltage sampling unit, a logic control unit, a current sampling unit, a constant current control unit, a switch array, a capacitor, a resistor, and an LED light string composed of LED units; the LED light string head and the input rectification unit The output terminal is electrically connected, the tail is electrically connected to the constant current control unit, the other end of the constant current control unit is connected in series with the capacitor and the resistor in sequence, and the other end of the resistor is grounded; the LED unit between the two adjacent LED units and the tail A diode is also connected in series; the anode of the diode is connected to the negative pole of the adjacent LED unit, and the cathode of the diode is connected to the positive pole of the adjacent LED unit; the cathode of the diode at the tail and the positive pole of the LED unit at the head There is also a diode connected...

Embodiment 2

[0043] see Image 6 , the difference between this embodiment 2 and embodiment 1 is: in this embodiment 2, or by controlling 8 LED units through the switch array to realize the conversion of four-cut series to parallel; it also includes switches K103, K104, K205, K206, K207, K208 ,; K301 and K302. Other parts of Embodiment 2 are the same as Embodiment 1 and will not be described in detail.

[0044] Based on the above differences, see Figure 7 , Figure 8 , Figure 9 and Figure 10 , Analysis of the four-cutting principle in Example 2: Assume that the peak value of the input voltage Vin is Vp, and the LED voltage V LED It is 4 / 5*Vp, the steady-state initial voltage of the capacitor is Va, and the output current of a single LED string is I. The whole control is divided into two phases, the first phase is the phase of Vin falling from the peak value to 0, and the second phase is the phase of Vin rising from 0 to the peak value.

[0045] The first stage:

[0046] A, Vin d...

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Abstract

The invention discloses a high-performance current-type multi-switching LED controller, which comprises an input rectifier unit, a voltage sampling unit, a logic control unit, a current sampling unit, a constant current control unit, a switch array, capacitors, a resistor and an LED lamp string, wherein the logic control unit sends control signals to the switch array according to voltage and current signals acquired by the voltage sampling unit and the current sampling unit and controls the LED lamp string to realize three-switching or four-switching series-to-parallel conversion, and control signals are sent to adjust the current value of the constant current control unit. The high-performance current-type multi-switching LED controller has the advantages that no ripple wave does exist; EMI is low; the efficiency is high; the single-voltage input range is realized; the PF value is high; miniature, integration and low cost are realized; due to the method of voltage sharing by serial capacitors, self-adaption on input voltage changes is greatly expanded, the system efficiency is improved, and strong filter and power supply are provided for the LED; and due to the creative current monitoring self-lock switch, the system efficiency is greatly improved, the system size is reduced and the system cost is reduced.

Description

technical field [0001] The invention relates to an LED driving technology, in particular to a high-performance current type multi-cut LED controller. Background technique [0002] There are three types of current LED drive technologies: one is the resistance-capacitance circuit, the disadvantage is that the constant current accuracy is not high, and it is only suitable for below 5W; the cost is low, and the efficiency is as high as about 95%; The second is the switching power supply. The disadvantage is that the constant current has high precision and can work in a wide range; high cost, high efficiency, serious EMI, large ripple; large size. The third is segmental linearity. The disadvantage is that the constant current accuracy is high, and it is not suitable for a certain voltage range like the resistance and capacitance; the cost is moderate, the efficiency is low, the ripple is small, but the utilization rate of the lamp beads is low; the size is small. In short, the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
CPCH05B47/10
Inventor 陈敦军雷建明张荣郑有炓
Owner NANJING UNIV
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