Power management for power constrained devices

A system for optimizing the use of energy consumption by electronics having multiple loads, the system comprising:

• a DC power source for providing DC electrical power;
• an energy storage circuit for storing power produced by the DC power source;
• a hysteretic switch circuit having an input coupled to the energy storage circuit and an output coupled to a node, the hysteretic switch circuit for coupling power stored by the energy storage circuit to the node when the power stored by the energy storage circuit is above a charge threshold;
• and
• an energy distribution circuit having an input coupled to the node, and for controlling operating time during which DC voltage above an operating threshold voltage is presented to each of a plurality of device loads coupled to an output of the energy distribution circuit, wherein at least two of the device loads have different operating times.

A system for optimizing the use of energy consumption by electronics having multiple loads, the system comprising:

• a DC power source for providing DC electrical power to the system, wherein the DC power source includes at least one of a battery and/or an antenna operatively coupled to a rectifier, wherein RF energy scavenged by the antenna is rectified to provide DC power;
• a hysteretic switch circuit having an input for coupling to an energy storage circuit and an output coupled to a node, the hysteretic switch circuit for coupling power stored by the energy storage circuit to the node when the power stored by the energy storage circuit reaches a charge threshold;
• and
• an energy distribution circuit having an input coupled to the node, and for controlling operating time during which DC voltage above an operating threshold voltage is presented to each of a plurality of device loads coupled to an output of the energy distribution circuit, wherein the energy distribution circuit comprises at least one diode and one capacitor associated with each of at least two of its outputs, the at least one diode for setting a maximum DC voltage provided by that output, and the at least one capacitor for setting the operating time associated with that output, and wherein at least two of the device loads have different operating times, and wherein at least two of the device loads have different operating threshold voltage ranges.