An efficient full‐bridge resonant converter for light emitting diode (LED) application with simple current control

Abstract

New power control is introduced in the full-bridge dc-dc converter to drive an LED lamp in this paper. LEDs are semiconductor devices that behave like a constant voltage load with low equivalent series resistance (ESR). Hence, they require precise control for current regulation. In the proposed driver, the LED lamp is driven by two voltage sources connected in series through a series resonant circuit. It processes the majority of lamp power through the full-bridge diode rectifier and supplies small power through a center-tapped rectifier.The LED lamp current is controlled at the selected operating current by using center-tapped rectifier output voltage. In addition, pulse-width modulation (PWM) dimming is implemented. The proposed topology features zerovoltage switching (ZVS), regulation of lamp current, dimming operation, and high efficiency. The working principle, performance, and prototype validation are given for the proposed LED driver.

Soft‐switched full‐bridge light‐emitting diode driver with reduced rectifier components

“…Comparative analysis of the proposed LED driver with existing topologies is given in Table 1. From the comparison table, it is clear the efficiency of the proposed converter is higher than the converters in other studies, 27–29 which are working on full‐bridge series resonant converter principal. Also, the component count of the presented converter is less than the converters in and Kasi Ramakrishnareddy et al 28 and Veeramallu et al 29 .…”

“…From the comparison table, it is clear the efficiency of the proposed converter is higher than the converters in other studies, 27–29 which are working on full‐bridge series resonant converter principal. Also, the component count of the presented converter is less than the converters in and Kasi Ramakrishnareddy et al 28 and Veeramallu et al 29 . Even though the component count in kasi Ramakrishnareddy et al 28 is less than the proposed converter, it 28 uses a high‐frequency transformer which makes the converter bulky.…”

“…11,12 Several LED drivers presented in the literature are developed for alternating current (AC) power, which handle issues such as low power factor and electrolytic capacitor elimination. [13][14][15][16][17][18] However, the primary goals of LED drivers powered by a battery or a DC grid are a low component count, reduced switching losses, a simple layout, and small size. Non-isolated resonant converters are a superior solution for achieving these goals.…”

Non‐isolated high step‐up/step‐down quadratic converter for light‐emitting diode driving

“…Distinct PC schemes have also been described in the literature as applied to resonant converters. For instance, a simple approach is applied to a resonant full‐bridge converter by Ramakrishnareddy Ch et al, 15 in which a LED lamp is driven by two voltage sources connected in series through a series resonant circuit.…”

A buck‐boost integrated high gain non‐isolated half‐bridge series resonant converter for solar PV/battery fed multiple load LED lighting applications

“…Half‐bridge and full‐bridge based series, parallel and series‐parallel resonant converters are widely employed for LED drivers. A multistring LED driver using full‐bridge resonant converter is presented in Qu et al A novel current‐controlled LED driver is proposed in Ramakrishnareddy et al using full‐bridge resonant converter, which demands for an additional transformer, switch, and three diodes. The input of the full‐bridge series resonant converter is regulated using a buck‐boost converter in Reddy et al, where the power processed in buck‐boost converter is low.…”