MULTIPLE-INPUT ELECTRONIC BALLAST WITH PROCESSOR
First Claim
1. A ballast for a gas discharge lamp comprising:
- a processor for controlling a level of a ballast output signal in response to a plurality of ballast control signals;
an inverter for receiving a processor output signal from said processor and providing said ballast output signal in response to said processor output signal; and
a plurality of input terminals for receiving said plurality of ballast control signals, wherein;
said plurality of ballast control signals is coupled to said processor via said input terminals; and
at least one of said plurality of input terminals is a bidirectional terminal capable of receiving and sending control signals.
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Accused Products
Abstract
A ballast having a microprocessor embedded therein is controlled via four inputs. The ballast includes a high-voltage phase-controlled signal provided by a dimmer and an infrared (IR) receiver through which the ballast can receive data signals from an IR transmitter. The ballast can also receive commands from other ballasts or a master control on the serial digital communication link, such as a DALI protocol link. The fourth input is an analog signal, which is simply a DC signal that linearly ranges in value from a predetermined lower limit to a predetermined upper limit, corresponding to the 0% to 100% dimming range of the load. The output stage of the ballast includes one or more FETs, which are used to control the current flow to the lamp. Based on these inputs, the microprocessor makes a decision on the intensity levels of the load and directly drives the FETs in the output stage.
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Citations
19 Claims
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1. A ballast for a gas discharge lamp comprising:
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a processor for controlling a level of a ballast output signal in response to a plurality of ballast control signals; an inverter for receiving a processor output signal from said processor and providing said ballast output signal in response to said processor output signal; and a plurality of input terminals for receiving said plurality of ballast control signals, wherein; said plurality of ballast control signals is coupled to said processor via said input terminals; and at least one of said plurality of input terminals is a bidirectional terminal capable of receiving and sending control signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A distributed ballast system comprising:
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a distributed plurality of ballasts coupled together via a bidirectional interface, each ballast comprising; a processor for controlling a level of a ballast output signal in response to a plurality of ballast control signals; an inverter for receiving a processor output signal from said processor and providing said ballast output signal in response to said processor output signal; a plurality of input terminals for receiving said plurality of ballast control signals, wherein; said plurality of ballast control signals is coupled to said processor via said input terminals; and said ballasts of said plurality of ballasts are inter-coupled via a bidirectional interface. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification