Driver circuit for powering a DC lamp in a non-DC lamp fitting
First Claim
1. A driver circuit for adapting a dc lamp to operate with any of an ac power supply, an electromagnetic ballast or an electronic ballast, comprising:
- a first stage comprising a filter circuit and having an input connectable to any of an ac power supply, an electromagnetic ballast or an electronic ballast;
a second stage comprising a high frequency switched network and having an input connected to an output of the first stage; and
a third stage comprising an ac/dc converter and having an input connected to an output of the second stage and an output connectable to a dc lamp, said third stage being configured to deliver dc power to a connected dc lamp;
wherein said second stage is configured to operate in a low frequency mode when said driver circuit is connected to an ac power supply or an electromagnetic ballast and configured to operate in a high frequency mode when said driver circuit is connected to an electronic ballast.
1 Assignment
0 Petitions
Accused Products
Abstract
A driver circuit for adapting an LED lamp or an LED lamp array to be used in a lamp fitting for a non-LED type lamp without modification of the lamp fitting. The LED lamp or LED lamp array can be inserted into the lamp fitting as a replacement for a non-LED lamp. The driver circuit has a first stage with a filter circuit and having an input connectable to any of an ac power supply, an electromagnetic ballast or an electronic ballast of the lamp fitting; a second stage with a high frequency switched network and having an input connected to an output of the first stage; and a third stage with an ac/dc converter and having an input connected to an output of the second stage and an output connectable to an LED lamp. The third stage is configured to deliver dc power to a connected LED lamp. The second stage is configured to operate in a low frequency mode and in a high frequency mode.
17 Citations
21 Claims
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1. A driver circuit for adapting a dc lamp to operate with any of an ac power supply, an electromagnetic ballast or an electronic ballast, comprising:
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a first stage comprising a filter circuit and having an input connectable to any of an ac power supply, an electromagnetic ballast or an electronic ballast; a second stage comprising a high frequency switched network and having an input connected to an output of the first stage; and a third stage comprising an ac/dc converter and having an input connected to an output of the second stage and an output connectable to a dc lamp, said third stage being configured to deliver dc power to a connected dc lamp; wherein said second stage is configured to operate in a low frequency mode when said driver circuit is connected to an ac power supply or an electromagnetic ballast and configured to operate in a high frequency mode when said driver circuit is connected to an electronic ballast. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification