| 摘要 |
<p>Disclosed is an LED drive circuit, comprising a rectifier circuit, an LED power supply circuit, and an LED drive chip. The LED drive chip is capable of generating a reference voltage corresponding to an input voltage, and controlling the LED power supply circuit to provide a drive current for an LED lamp. According to the present invention, the LED drive circuit adjusts output power of the LED drive chip under the input of high and low voltages in real time, and dynamically compensates the output power to reduce an impact of a real-time change of the input voltage on the output of the drive circuit; therefore, an output power frequency ripple is reduced under the premise of using a small high-voltage capacitor and an output filtering capacitor, thereby reducing the dependence of the drive circuit on high-voltage capacitor, especially the dependence on an electrolytic capacitor, reducing the ripple size of an output current, and further implementing a drive manner without an electrolytic capacitor and improving the service life of the LED drive circuit.</p> |
