Patent ID: 8362705
Filing Date: 2013-01-29
Classification: H05B,Y02B

Abstract:
1. An analog LED controller comprising: a power supply terminal; a voltage reference source having a DC reference voltage; an analog input terminal; a plurality of color LED control circuits comprising a first color LED control circuit, one or more nth color LED control circuits and a Nth color LED control circuit, wherein 1<n>N and N=a total number of the color LED control circuits; the first color LED control circuit comprising: (1) a first variable gain DC amplifier coupled with the power supply terminal, the voltage reference source and the input terminal, wherein the first variable gain DC amplifier provides (a) a maximum voltage gain whenever an input voltage at the analog input terminal is approximately equal to 0 VDC, and (b) a minimum voltage gain whenever the input voltage at the analog input terminal is approximately equal to or greater than 1/(N−1) of the DC reference voltage, (2) a first limiter coupled with the first variable gain DC amplifier, (3) a first LED driver circuit coupled with the power supply terminal and the first limiter, and (4) a first analog LED output terminal coupled to the first LED driver circuit; each nth color LED control circuit comprising: (1) a nth variable gain DC amplifier coupled with the power supply terminal and the input terminal, wherein the nth variable gain DC amplifier provides (a) the maximum voltage gain whenever the input voltage at the analog input terminal is approximately equal to (n−1)/(N−1) of the DC reference voltage, and (b) the minimum voltage gain whenever the input voltage at the analog input terminal is approximately less than or equal to (n−2)/(N−1) of the DC reference voltage or approximately equal to n/(N−1) of the DC reference voltage, (2) a nth limiter coupled with the nth variable gain DC amplifier, (3) a nth LED driver circuit coupled with the power supply terminal and the nth limiter, and (4) a nth analog LED output terminal coupled to the nth LED driver circuit; and the Nth color LED control circuit comprising: (1) a fixed gain DC amplifier coupled with the power supply terminal and the input terminal, wherein the fixed gain DC amplifier provides a maximum engineered voltage gain, (2) a Nth limiter coupled with the fixed gain DC amplifier, (3) a Nth LED driver circuit coupled with the power supply terminal and the Nth limiter, and (4) a Nth analog LED output terminal coupled to the Nth LED driver circuit.