| Summary: | 碩士 === 國立臺北科技大學 === 電機工程系 === 107 === LED lighting has many advantages such as no mercury, long life, and small
size, so that it is widely used in daily life. A single-inductor multiple-output dimmable boost-type LED driver with input current ripple cancelation is presented in this thesis. The driver uses a boost converter with a single-inductor multiple-output architecture and this architecture uses discontinuous conduction mode to solve the cross regulation problem of single-inductor multiple-output, and each LED string is independently controlled, no current regulation is used for preventing from additional power loss. In addition, in order to solve the large input current ripple generated in discontinuous conduction mode, which affects the life of the power supply input terminal, the input of the driver is an input current ripple cancellation architecture. This architecture can reduce input current ripple, requires only a few additional components, and does not require any active circuit to control.
The proposed single-inductor multiple-output boost-type LED driver with
input current ripple cancelation is implemented in TSMC 0.35μm 2P4M CMOS process. The chip area including I/O PADs is 1.4966 x 1.4785 mm2(W x L). The specifications of the LED driver are input voltage of 5V, output voltage of 7-10V, switch frequency of 500 kHz, LED current range of 150mA-350mA.The simulation results show that when the LED current is operated at 150mA-350 mA, the current errors of red, green and blue light are less than 0.3%. In addition, the driver input current ripple is less than 0.5% through the current ripple cancellation circuit.
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