Load control device for a light-emitting diode light source having different operating modes
First Claim
1. A method for controlling an amount of power delivered to an electrical load, the method comprising:
- during a normal mode, regulating an average magnitude of a load current conducted through the electrical load by holding a burst duty cycle of a load regulation circuit constant and adjusting a target load current conducted through the electrical load; and
during an intermediate mode and a low-end mode, controlling the load regulation circuit to operate in active state periods during which the load regulation circuit is active and in inactive state periods during which the load regulation circuit is inactive, andduring the intermediate mode, adjusting the burst duty cycle and the average magnitude of the load current by keeping the length of the inactive state periods constant and adjusting the length of the active state periods; and
during the low-end mode, adjusting the burst duty cycle and the average magnitude of the load current by keeping the length of the active state periods constant and adjusting the length of the inactive state periods.
1 Assignment
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Accused Products
Abstract
A load control device for regulating an average magnitude of a load current conducted through an electrical load may operate in different modes. The load control device may comprise a control circuit configured to activate an inverter circuit during an active state period and deactivate the inverter circuit during an inactive state period. In one mode, the control circuit may adjust the average magnitude of the load current by adjusting the inactive state period while keeping the active state period constant. In another mode, the control circuit may adjust the average magnitude of the load current by adjusting the active state period while keeping the inactive state period constant. In yet another mode, the control circuit may keep a duty cycle of the inverter circuit constant and regulate the average magnitude of the load current by adjusting a target load current conducted through the electrical load.
123 Citations
20 Claims
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1. A method for controlling an amount of power delivered to an electrical load, the method comprising:
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during a normal mode, regulating an average magnitude of a load current conducted through the electrical load by holding a burst duty cycle of a load regulation circuit constant and adjusting a target load current conducted through the electrical load; and during an intermediate mode and a low-end mode, controlling the load regulation circuit to operate in active state periods during which the load regulation circuit is active and in inactive state periods during which the load regulation circuit is inactive, and during the intermediate mode, adjusting the burst duty cycle and the average magnitude of the load current by keeping the length of the inactive state periods constant and adjusting the length of the active state periods; and during the low-end mode, adjusting the burst duty cycle and the average magnitude of the load current by keeping the length of the active state periods constant and adjusting the length of the inactive state periods. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for controlling an intensity of a light-emitting diode (LED) light source towards a target intensity, the method comprising:
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when operating in a normal mode; adjusting an average magnitude of a load current conducted through the LED light source by holding a burst duty cycle of a load regulation circuit constant and adjusting a target load current conducted through the LED light source; and when operating in a burst mode; controlling the load regulation circuit to operate in active state periods during which the load regulation circuit is active and in inactive state periods during which the load regulation circuit is inactive, and adjusting the burst duty cycle and the average magnitude of the load current by keeping the length of the active state periods constant and adjusting the length of the inactive state periods if the target intensity is within a first intensity range, and by keeping the length of the inactive state periods constant and adjusting the length of the active state periods if the target intensity is within a second intensity range. - View Dependent Claims (14, 15, 16)
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17. A method for controlling an intensity of a lighting load towards a target intensity, the method comprising:
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when the target intensity is greater than a transition intensity, adjusting an average magnitude of a load current conducted through the lighting load by holding a duty cycle of a load regulation circuit constant and adjusting a target load current conducted through the lighting load; when the target intensity is less than the transition intensity, controlling a load regulation circuit to operate in active state periods during which the load regulation circuit is active and in inactive state periods during which the load regulation circuit is inactive; when the target intensity is less than the transition intensity and the length of the inactive state periods is equal to a minimum inactive state period, adjusting the duty cycle and the average magnitude of the load current by keeping the length of the inactive state periods constant and adjusting the length of the active state periods; and when the target intensity is less than the transition intensity and the length of the inactive state periods is greater than the minimum inactive state period, adjusting the duty cycle and the average magnitude of the load current by keeping the length of the active state periods constant and adjusting the length of the inactive state periods. - View Dependent Claims (18, 19, 20)
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Specification