Circuit for illuminating multiple light emitting devices
AssigneeBayco Products, Ltd.
InventorsBijan Bayat, James Newton, Robert Lee Ellis
Life of this patent
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Abstract
A single drive circuit is configured to drive disparate current loads of first and second combinations of compact light emitting devices with respective regulated constant currents. Standard push ON, push OFF latching switches provide independent control of the two lighting loads wherein each switch operates in three states including momentary ON, continuous ON, and OFF. The circuit is readily adapted to providing continuous or pulsed drive to the lighting arrays. Circuits for dimming control, strobe control, and a low battery indicator are also described.
Claims39
A circuit for illuminating multiple light emitting devices, comprising:
- a current selector circuit connected across a positive terminal and a negative terminal of a DC supply for selecting operating current from the DC supply to each of a first array and a second array of the multiple light emitting devices (LEDs);
- a switching regulator circuit connected across an output of the current selector circuit for respectively regulating first and second constant drive currents to the first array of LEDs and to the second array of LEDs;
- a first array of LEDs coupled between a first output of the switching regulator circuit and a common current sense device;
- and
- a second array of LEDs coupled between the first output of the switching regulator circuit and the common current sense device;
- wherein
- a voltage signal generated by the common current sense device is coupled to a sense input of the switching regulator circuit for regulating the constant drive currents supplied to the first and second arrays of LEDs.
In a circuit for illuminating multiple light emitting devices, a combination comprising:
- a current selector circuit connected across a positive terminal and a negative terminal of a DC supply for selecting operating current from the DC supply to be supplied to each of a first array and a second array of the multiple light emitting devices (LEDs);
- a first single pole single throw (SPST) switch having normally open (NO) contacts for selecting current to be delivered to the first array of LEDs;
- and
- a second SPST switch having NO contacts for selecting current to be delivered to the second array of LEDs.
Dependencies are inferred from the claim text.