| 摘要 |
<p>PURPOSE: An LED lamp is provided to reduce energy by turning on the LED lamp using solar energy. CONSTITUTION: A solar cell controller(102) controls a solar cell module. A charging controller(106) charges a battery(230) with power of the solar cell module. An overcharge/overdischarge protection circuit(108) protects the battery by preventing the overcharge and the overdischarge of the battery. An LCD(Liquid Crystal Display)(116) displays data and various operation status. An LCD controller(114) drives an LCD according to a control signal. A DC-DC converting and constant voltage/current controller(112) converts the DC voltage of the battery into the DC voltage for turning on the LED lamp according to a PWM(Pulse Width Modulation) control signal.</p> |
