Transformerless LED driving circuit

Details Transformerless LED driving circuit Transformerless LED driving circuit

1997-04-16

1999-06-29

Miska, Vit

Horology: time measuring systems or devices

Chronological

With electro-optical display

368204, 368241, 345211, G04C 1900, G04B 3712, G09G 500

Patent

active

059177799

ABSTRACT:
A transformerless oven timer which uses a 20 pin microcontroller connected to light emitting diodes. The microcontroller has 2 Kbytes of 8 bit read only memory and has software etched therein. The microcontroller can transfer power and voltage to the light emitting diodes when the oven is connected to, and powered by, an electrical outlet. The software etched into the microcontroller detects whether a resistor is connected to the microcontroller and converts a pin on the microcontroller from an input into an output. The software also synchronizes the microcontroller with the frequency of the electrical outlet to provide that the microcontroller keeps track of time. The transformerless oven timer also includes electrical circuitry connected to the microcontroller, where the electrical circuitry reduces the voltage and current provided to the microcontroller and to the light emitting diodes without using a transformer. The electrical circuitry also provides real resistance to reject noise from the electrical outlet.

REFERENCES:
patent: 3602795 (1971-08-01), Gunn
patent: 3869641 (1975-03-01), Goldberg
patent: 4201039 (1980-05-01), Marion
patent: 4342947 (1982-08-01), Bloyd
patent: 4697930 (1987-10-01), Roberts et al.
patent: 4908569 (1990-03-01), Fest
patent: 5600549 (1997-02-01), Cross

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