LED DRIVER WITH HIGH DIMMING COMPATIBILITY WITHOUT THE USE OF BLEEDERS
First Claim
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1. A circuit for controlling a switching converter, the circuit comprising:
- an input voltage or phase analyzer for detecting when a dimmer circuit supplying power to the switching converter changes from a conducting state to a nonconducting state or from a nonconducting state to a conducting state; and
a pulse-width-modulating generator for changing an equivalent input resistance of the switching converter to a first, higher value when the dimmer circuit is in the conducting state and to a second, lower value when the dimmer circuit is in the nonconducting state, thereby drawing a minimum current from the dimmer circuit while the dimmer circuit is in the nonconducting state.
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Abstract
A switching converter detects when a dimmer circuit supplying power to the switching converter changes from a conducting state to a nonconducting state or from a nonconducting state to a conducting state; an equivalent input resistance of the switching converter is changed to a first, higher value when the dimmer circuit is in the conducting state and to a second, lower value when the dimmer circuit is in the nonconducting state, thereby drawing a minimum current from the dimmer circuit while the dimmer circuit is in the nonconducting state.
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Citations
15 Claims
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1. A circuit for controlling a switching converter, the circuit comprising:
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an input voltage or phase analyzer for detecting when a dimmer circuit supplying power to the switching converter changes from a conducting state to a nonconducting state or from a nonconducting state to a conducting state; and a pulse-width-modulating generator for changing an equivalent input resistance of the switching converter to a first, higher value when the dimmer circuit is in the conducting state and to a second, lower value when the dimmer circuit is in the nonconducting state, thereby drawing a minimum current from the dimmer circuit while the dimmer circuit is in the nonconducting state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling a switching converter, the circuit comprising:
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detecting when a dimmer circuit supplying power to the switching converter changes from a conducting state to a nonconducting state or from a nonconducting state to a conducting state; and changing an equivalent input resistance of the switching converter to a first, higher value when the dimmer circuit is in the conducting state and to a second, lower value when the dimmer circuit is in the nonconducting state, thereby drawing a minimum current from the dimmer circuit while the dimmer circuit is in the nonconducting state. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification