ENERGY STORAGE LEVEL INDICATION CIRCUIT
First Claim
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1. An energy storage level indication circuit, comprising:
- a first energy storage device having a first capacity;
a second energy storage device having a second capacity lower than the first capacity, the second energy storage device being charged by the first energy storage device; and
a signal generator operable to transmit a heartbeat signal in response to the second energy storage device being charged to a threshold, wherein the rate of heartbeat signal transmission indicates an amount of energy stored in the first energy storage device.
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Abstract
An energy storage level indication circuit includes an energy storage device and a radio control module operable to transmit a wireless heartbeat signal at a rate indicating an amount of energy stored in the energy storage device.
11 Citations
22 Claims
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1. An energy storage level indication circuit, comprising:
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a first energy storage device having a first capacity; a second energy storage device having a second capacity lower than the first capacity, the second energy storage device being charged by the first energy storage device; and a signal generator operable to transmit a heartbeat signal in response to the second energy storage device being charged to a threshold, wherein the rate of heartbeat signal transmission indicates an amount of energy stored in the first energy storage device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An energy storage level indication circuit, comprising:
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an energy storage device; and a radio control module operable to transmit a wireless heartbeat signal at a rate indicating an amount of energy stored in the energy storage device. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of indicating an amount of energy stored in an energy storage device:
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harvesting energy from environmental conditions using an energy harvester; charging an energy storage device using the harvested energy; and transmitting a wireless heartbeat signal at a rate indicating an amount of energy stored in the energy storage device. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification