US Patent No. 10,462,861


Patent No. 10,462,861
Issue Date October 29, 2019
Title Adaptive Power Regulation Of Led Driver Module For Emergency Lighting
Inventorship Jie Dong Wang, Irvine, CA (US)

Claim of US Patent No. 10,462,861

1. A regulated power LED driver circuit comprising:a power sampling circuit comprising:
an analog multiplier that generates an input power sampling signal in the form of voltage signal by multiplying samplings of input current and input voltage;
wherein the input current sampling is a differential signal that is inputted directly into differential ports of the analog multiplier;
a power regulation circuit electrically connected to the power sampling circuit and comprising:
a voltage divider that scales down the input power sampling signal;
a compensation network adapted to receive the scaled-down input power sampling signal from the first circuit and comprising a resistor-capacitor (RC) network;
a comparator that generates a power error signal by comparing the scaled-down input power sample signal with a reference voltage;
a resistor adapted to provide a primary current feedback signal;
a switcher; and
a pulse width modulation (PWM) comparator that receives as inputs the power error signal and the primary current feedback signal and generates a modulated pulse width signal and thus controls the switcher's turning ON and OFF, to regulate the output power of the LED driver circuit; and
a power output circuit electrically connected to the power regulation circuit and comprising Oring diodes to switch between the regulated output power of the LED driver circuit and power from an external AC driver.