Solid State Lighting, Driver Circuits, and Related Software
First Claim
1. A solid state lighting driver circuit comprising:
- a EMI filter configured and arranged to receive a AC input from an AC power supply;
a rectifier connecting the EMI filter, the rectifier being configured and arranged to receive AC power from the EMI filter and produce a rectified current;
a power factor correction (PFC) stage including a boost circuit connected to the rectifier, the boost circuit being configured and arranged to receive the rectified current and to produce a power factor corrected output with a higher voltage than the AC input of the AC power supply;
a Buck regulator configured and arranged to receive power from the PFC stage and regulate power for supply to a plurality of LEDs; and
a controller configured and arranged to control the Buck regulator and PFC stage for hysteretic PFC start-up.
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Accused Products
Abstract
LED lighting fixtures, or luminaires, related components, driver circuit, methods, and software/firmware are described can provide for among other things, ambient environment sensing, thermal self-monitoring, sensor-based power management, communications, and/or programmability. Driver and lighting circuits configured for electrical loads such as series arrangements of light emitting diodes are also described. Embodiments of PFC stages and driver stages can be combined for use as a power supply, and may be configured on a common circuit board. Power factor correction and driver circuits can be combined with one or more lighting elements as a lighting apparatus. Methods of hysteretic power factor correction start-up are also described.
102 Citations
31 Claims
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1. A solid state lighting driver circuit comprising:
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a EMI filter configured and arranged to receive a AC input from an AC power supply; a rectifier connecting the EMI filter, the rectifier being configured and arranged to receive AC power from the EMI filter and produce a rectified current; a power factor correction (PFC) stage including a boost circuit connected to the rectifier, the boost circuit being configured and arranged to receive the rectified current and to produce a power factor corrected output with a higher voltage than the AC input of the AC power supply; a Buck regulator configured and arranged to receive power from the PFC stage and regulate power for supply to a plurality of LEDs; and a controller configured and arranged to control the Buck regulator and PFC stage for hysteretic PFC start-up. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A lighting power supply comprising:
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(i) a PFC stage including; a EMI filter configured and arranged to receive a AC input from an AC power supply; a rectifier connecting the EMI filter portion, the rectifier being configured and arranged to receive AC power from the EMI filter and produce a rectified current; and a boost portion connected to the rectifier, the boost portion being configured and arranged to receive the rectified current and to produce a power factor corrected output with a higher voltage than the AC input of the AC power supply; and (ii) a driver stage, configured and arranged to receive output from the PFC stage and supply as an output power to an electrical load, the driver stage including a Buck regulator; and (iii) a controller configured and arranged to control the Buck regulator and PFC stage for hysteretic PFC start-up. - View Dependent Claims (14, 15, 16, 17)
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18. A lighting apparatus comprising:
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(i) a PFC stage including; a EMI filter configured and arranged to receive a AC input from an AC power supply; a rectifier connecting the EMI filter portion, the rectifier being configured and arranged to receive AC power from the EMI filter and produce a rectified current; and a boost portion connected to the rectifier, the boost portion being configured and arranged to receive the rectified current and to produce a power factor corrected output with a higher voltage than the AC input of the AC power supply; and (ii) a power regulation circuit including a Buck regulator, configured and arranged to receive output from the PFC stage and supply as an output power to an electrical load, the driver stage including a driver controller; (iii) a controller configured and arranged to control the Buck regulator and PFC stage for hysteretic PFC start-up; and (iv) one or more lighting elements configured and arranged to receive power from the power regulation circuit. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 31)
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30. A method of providing hysteretic power factor correction (PFC) start up for a LED luminaire, the method comprising:
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(i) with the current of the PFC stage in an off condition, and with the Buck regulator in an off condition, causing the PFC stage to start up at a nominal rate and begin to charge a boost capacitor; (ii) when a desired high fixed voltage is reached, turning off the Buck regulator at a low current value and turn off the PFC state; (iii) adjusting a ramp-up voltage time, between a first voltage and a second voltage, to equal a ramp-down voltage between the first and second voltage; and (iv) forming a ratio of the rise time and fall time to predict the on-time needed for steady-state operation.
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Specification