| 发明名称 | Current ripple canceling LED driver | ||
| 摘要 | A current ripple canceling light-emitting diode (LED) driver is disclosed. The input current source contains a current ripple. The LED load is connected to the drain of a power switch. The source of the power switch is connected to a current sensing resistor. The gate of the power switch is connected to the output of an operational amplifier. The operational amplifier compares the voltage signal across the current sensing resistor with a dynamic reference voltage. The dynamic reference voltage is adjusted according to the gate or drain voltage of the power switch. The LED load current is controlled to be a nearly no ripple DC current. | ||
| 申请公布号 | US9107260(B2) | 申请公布日期 | 2015.08.11 |
| 申请号 | US201314039072 | 申请日期 | 2013.09.27 |
| 申请人 | Shanghai Bright Power Semiconductor Co., Ltd. | 发明人 | Sun Shungen;Yu Deshui;Hu Liqiang |
| 分类号 | H05B33/08 | 主分类号 | H05B33/08 |
| 代理机构 | Lerner, David, Littenberg, Krumholz & Mentlik LLP | 代理人 | Lerner, David, Littenberg, Krumholz & Mentlik LLP |
| 主权项 | 1. A current ripple canceling LED driver, comprising: an input source, a filtering capacitor and an LED load, characterized in that, the LED load is connected to a power switch, the source of the power switch is connected to a current sensing resistor, the gate of the power switch is connected to the output of an operational amplifier, wherein the input source is a current source containing a current ripple, the operational amplifier compares the voltage signal across the current sensing resistor with a dynamic reference voltage, the dynamic reference voltage being a voltage signal of an integrating capacitor, and the power switch is controlled to regulate the LED load current to be a nearly no ripple DC current. | ||
| 地址 | CN | ||