Method for redundant control of service indicator leds
AssigneeInternational Business Machines Corporation
InventorEnrique Q. Garcia
Life of this patent
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Abstract
A lighting circuit for energizing an indicating light on a device coupled to a host, the circuit including a flasher circuit of the host; a fault detection circuit of the device; and an XNOR gate for receiving input from the flasher circuit and the fault detection circuit wherein the lighting circuit is adapted for energizing the indicating light and causing the indicating light to flash in the presence of a fault signal from the fault detection circuit
Claims8
A lighting circuit for energizing an indicating light on a device coupled to a host, the circuit comprising;
- a flasher circuit of the host;
- a fault detection circuit of the device;
- and
- an XNOR gate for receiving input from the flasher circuit and the fault detection circuit wherein the lighting circuit is adapted for energizing the indicating light and causing the indicating light to flash in the presence of a fault signal from the fault detection circuit.
A method for energizing an indicating light on a device, the method comprising:
- receiving a fault signal by an XNOR gate;
- and
- initiating flashing of the indicating light.
A lighting circuit for energizing a light-emitting diode (LED) on a device coupled to a host, the circuit comprising:
- a flasher circuit of the host;
- a fault detection circuit of the device;
- an XNOR gate comprising at least one n-channel MOSFET, the XNOR gate for receiving input from the flasher circuit and the fault detection circuit wherein the lighting circuit is adapted for energizing the LED and causing the LED to flash in the presence of a fault signal from the fault detection circuit;
- and
- a switch comprising a p-channel MOSFET wherein the flasher circuit provides power to the LED through the switch when power is removed from the device.
Dependencies are inferred from the claim text.