Draining residual charge from a voltage plane
AssigneeDell Products L.P.
InventorsJoshua N. Alperin, Glenroy Devonish, Ajay Kwatra, Todd W. Schlottman
Life of this patent
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Abstract
An energy discharge resistance is isolated from storage capacitance containing a voltage charge until power is removed from the storage capacitance. Then the discharge resistance may be coupled to the storage capacitance to drain residual charge therefrom. The discharge resistance is coupled to the storage capacitance when external power is removed and is un-coupled from the storage capacitance when external power is applied to the storage capacitance. In this way, unnecessary power draw during operation or standby of an electronic system is substantially eliminated.
Claims13
An information handling system having subassemblies with power source storage capacitance therein, said system comprising:
- at least one subassembly of an information handling system, the at least one subassembly having power source storage capacitance therein, the power source storage capacitance being adapted for coupling to a single voltage power source through a power diode;
- a discharge switch coupled to the storage capacitance;
- and
- a discharge resistance coupled to the discharge switch, wherein
- when the power source is coupled to the power diode said discharge switch de-couples said discharge resistance from the storage capacitance, and
- when the power source is not coupled to the power diode said discharge switch couples said discharge resistance to the storage capacitance, thereby draining residual voltage therefrom.
An apparatus for draining residual voltage charge from a voltage plane, comprising:
- a discharge switch adapted to be coupled to a storage capacitance coupled to a voltage plane;
- and
- a discharge resistance coupled to the discharge switch, wherein
- when a single voltage power source is coupled to the voltage plane through a power diode said discharge switch de-couples said discharge resistance from the storage capacitance, and
- when the power source is not coupled to the voltage plane through the power diode said discharge switch couples said discharge resistance to the storage capacitance, thereby draining residual voltage therefrom.
Dependencies are inferred from the claim text.