US Patent No. 10,588,194

ARBITRARY-RATIO ANALOG CURRENT DIVISION CIRCUIT


Patent No. 10,588,194
Issue Date March 10, 2020
Title Arbitrary-ratio Analog Current Division Circuit
Inventorship Yifeng Qiu, San Jose, CA (US)
Assignee Lumileds LLC, San Jose, CA (US)

Claim of US Patent No. 10,588,194

1. A device comprising:a voltage controlled current source;
a first sense resistor to sense a first sensed voltage of a first current channel;
a second sense resistor to sense a second sensed voltage of a second current channel;
a computational circuit comprising:
an operational amplifier, and
an RC circuit disposed between an output of the operational amplifier and ground, the RC circuit comprising a capacitor and resistor in parallel with the capacitor,
the operational amplifier configured to:
provide a charging current to charge the capacitor to increase an output voltage of the computational circuit when the first sensed voltage is less than the second sensed voltage, and
allow the capacitor to discharge through the resistor to decrease the output voltage when the first sensed voltage is greater than the second sensed voltage;
a first voltage control switch to power, using the voltage controlled current source, a first LED array based on the output voltage of the computational circuit; and
a second voltage control switch to power, using the voltage controlled current source, a second LED array based on the output voltage of the computational circuit.