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Aimed at the current imbalance problem in parallel connected multiple light-emitting diode (LED) strings, an efficient multi-output LED driver is proposed to achieve current sharing among different LED strings and improve the efficiency of the circuit. A Boost converter and a series-resonant converter are cascaded to achieve current sharing and a high voltage gain. The transformer leakage inductance suppresses the switch's current rising rate in the turn-on period, which provides the zero-current-switch (ZCS) condition. Moreover, a lossless snubber circuit is added to slow down the switch's voltage rising rate in the turn-off period to significantly reduce the switching loss, and a large magnetizing inductance of transformer is selected to reduce the transformer loss. Meanwhile, only one active switch is used, which reduces the circuit cost and simplifies the control. Therefore, current sharing, high efficiency and high voltage gain are obtained, and the cost is low. The circuit operational principle and operating characteristics together with the specific procedure of parameter design are analyzed and presented in detail. Finally, a 7.9 W two-output prototype with 12 V input voltage was built to verify the effectiveness of the proposed LED driver.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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