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Foreword
In order to improve the reliability and match the life of the LED power supply with the life of the LED lamp bead, the most effective measure is to use no Electrolytic Capacitor. This method has been put into practical use. However, commercialized electroless Capacitor power supplies are often suspected: Electrolytic capacitors are unlikely to have low ripple? This is exactly what this article is going to confuse. 
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For more information, please refer to "High - tech LED - Technology and Applications" December issue 
Electroless capacitor low ripple complementary Darlington active filter
[Source: "High - tech LED - Technology and Applications" December issue ]
1. Non-electrolytic capacitors Low-ripple complementary Darlington active filters (1.1) (Figure 1) Q11 and Q22 are preferred NPN high-power tubes with high current and low saturation voltage drop BVces(on).
(1) q1 and q2 in (Fig. 1) are NPN low power tubes with a high amplification factor and a low saturation voltage drop.
(1.3) (Fig. 1) Q1 and Q2 are PNP medium power tubes with high amplification factor and low saturation voltage drop.
(1.4) (Fig. 1) Ultra-high magnetic permeability magnetic ring B; the thick wire has fewer turns of the primary windings Ne1 and Ne2; the thin wire has a plurality of turns of the secondary windings Nb1 and Nb2.
By adjusting the number of turns of Nb1 and Nb2, it is possible to make the same-named ends of Nb1, Ne1, Ne2, and Nb2 have induced voltages of equal absolute values, which is the key to realizing the offset of the ripple. (1.5) (Figure 1) Input capacitor Cin, output capacitor Co, filter capacitor CB1 and CB2 are not electrolytic capacitors, please note that Cin, Co, CB1, CB2 have common points, so the four capacitors can be integrated into one, of course It can also be assembled with four single capacitors.
(1.6) The above four capacitors are integrated capacitors that can be combined into one. Conducive to reducing costs, reducing size and weight.
(1.7) q1, q2, Q1, Q2, Q11, Q12 are integrated power electronic modules. (Fig. 1) It is not necessary to use PCB. It can be directly connected to the power electronic switch module and integrated capacitor module by connecting terminals. The assembly process facilitates automated production.
(1.8) According to the order, the line and magnetic ring B, the power electronic switch module and the integrated capacitor module with the corresponding current can meet the low ripple coefficient of the specified current of the order, and are widely adapted to various users' requirements.