Load control device for a light-emitting diode light source
First Claim
1. A load control device for controlling an amount of power delivered to an electrical load, the load control device comprising:
- a load regulation circuit configured to control a magnitude of a load current conducted through the electrical load to control the amount of power delivered to the electrical load, the load regulation circuit comprising an inverter circuit; and
a control circuit coupled to the load regulation circuit and configured to regulate an average magnitude of the load current, the control circuit configured to control the inverter circuit to operate in active state periods during which the inverter circuit is active and in inactive state periods during which the inverter circuit is inactive, the control circuit further configured to operate in a normal mode and a burst mode, the burst mode characterized by a plurality of burst mode periods each comprising one of the active state periods and one of the inactive state periods,wherein, during the normal mode, the control circuit is configured to regulate the average magnitude of the load current by holding a length of the active state periods and a length of the inactive state periods constant, and adjusting a target load current conducted through the electrical load, andwherein, during the burst mode, the control circuit is configured to adjust the average magnitude of the load current by adjusting the length of the inactive state periods while holding the length of the active state periods constant in at least some of the burst mode periods.
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Accused Products
Abstract
A load control device for controlling the amount of power delivered to an electrical load is able to operate in a normal mode and a burst mode. The load control device may comprise a control circuit that activates an inverter circuit during active state periods and deactivates the inverter circuit during inactive state periods. The control circuit may operate in the normal mode to regulate an average magnitude of a load current conducted through the electrical load to be above a minimum rated current. The control circuit may operate in the burst mode to adjust the average magnitude of the load current to be below the minimum rated current. The control circuit may adjust the average magnitude of the load current by adjusting the length of the inactive state periods while holding the length of the active state periods constant.
125 Citations
30 Claims
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1. A load control device for controlling an amount of power delivered to an electrical load, the load control device comprising:
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a load regulation circuit configured to control a magnitude of a load current conducted through the electrical load to control the amount of power delivered to the electrical load, the load regulation circuit comprising an inverter circuit; and a control circuit coupled to the load regulation circuit and configured to regulate an average magnitude of the load current, the control circuit configured to control the inverter circuit to operate in active state periods during which the inverter circuit is active and in inactive state periods during which the inverter circuit is inactive, the control circuit further configured to operate in a normal mode and a burst mode, the burst mode characterized by a plurality of burst mode periods each comprising one of the active state periods and one of the inactive state periods, wherein, during the normal mode, the control circuit is configured to regulate the average magnitude of the load current by holding a length of the active state periods and a length of the inactive state periods constant, and adjusting a target load current conducted through the electrical load, and wherein, during the burst mode, the control circuit is configured to adjust the average magnitude of the load current by adjusting the length of the inactive state periods while holding the length of the active state periods constant in at least some of the burst mode periods. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An LED driver for controlling an intensity of an LED light source, the LED driver comprising:
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an LED drive circuit configured to control a magnitude of a load current conducted through the LED light source and to control the intensity of the LED light source, the LED drive circuit comprising an inverter circuit; and a control circuit coupled to the LED drive circuit and configured to regulate an average magnitude of the load current, the control circuit configured to control the inverter circuit to operate in active state periods during which the inverter circuit is active and in inactive state periods during which the inverter circuit is inactive, the control circuit further configured to operate in a normal mode and a burst mode, the burst mode characterized by a plurality of burst mode periods each comprising one of the active state periods and one of the inactive state periods, wherein, during the normal mode, the control circuit is configured to regulate the average magnitude of the load current by holding a length of the active state periods and a length of the inactive state periods constant, and adjusting a target load current conducted through the LED light source, and wherein, during the burst mode, the control circuit is configured to adjust the average magnitude of the load current by adjusting the length of the inactive state periods while holding the length of the active state periods constant in at least some of the burst mode periods. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A load control device for controlling an amount of power delivered to an electrical load, the load control device comprising:
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a load regulation circuit configured to control a magnitude of a load current conducted through the electrical load to control the amount of power delivered to the electrical load, the load regulation circuit comprising an inverter circuit; and a control circuit coupled to the load regulation circuit and configured to regulate an average magnitude of the load current, the control circuit configured to control the inverter circuit to operate in an active state period during which the inverter circuit is active and in an inactive state period during which the inverter circuit is inactive, the control circuit further configured to operate in a normal mode and a burst mode, the burst mode characterized by a burst mode period comprising the active state period and the inactive state period, wherein, during the normal mode, the control circuit is configured to regulate the average magnitude of the load current by holding a length of the active state period and a length of the inactive state period constant and adjusting a target load current conducted through the electrical load, and wherein, during the burst mode, the control circuit is configured to adjust the average magnitude of the load current by adjusting the length of the inactive state period in one or more burst mode periods while holding the length of the active state period constant, followed by adjusting both the length of the inactive state period and the length of the active state period in another burst mode period. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification