Home and small business phone system for operation on a single i

Details Home and small business phone system for operation on a single i Home and small business phone system for operation on a single i

1998-06-10

1999-09-28

Philogene, Haissa

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Regulator in shunt to the load device

3151693, 323282, G05F 100

Patent

active

059594136

ABSTRACT:
A low power, low noise driving circuit for a bank of LEDs utilized in the station units of the MAN system is provided by coupling each bank of LEDs in a series circuit between the voltage supply and a constant current source. Each LED has a controllable logic switch in parallel across it and the switches are further in series circuit with each other to form a ladder network. Any selected LED may be turned off by closing its corresponding logic switch. The current continues to flow then through the shunting switch into the remaining LEDs in the series circuit that are on. A plurality of such ladder networks may be coupled in parallel with each other and each ladder network controlled by a switching gate which selectively couples it to the constant current source so that the LED ladder networks are operated at a predetermined duty cycle. Current spikes are avoided across the voltage supply by driving the connecting control gates in an overlapping relationship so that the constant current source is never disconnected from the voltage supply.

REFERENCES:
patent: 4198629 (1980-04-01), Marion
patent: 4717868 (1988-01-01), Peterson

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