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AN-1036 Datasheet(PDF) 6 Page - Cymbet Corporation |
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AN-1036 Datasheet(HTML) 6 Page - Cymbet Corporation |
6 / 7 page AN-1036: EnerChip™ CC in EH Designs ©2011 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com AN-72-1036 Rev A Page 6 of 7 Figure 6. EnerChip CC EH Energy Harvesting Circuit as Implemented in the CBC-EVAL-09 Case Study When designing a ‘batteryless’ power system using energy harvesting, it is essential to know the system power requirements, including cumulative standby power of all system components, transmit/receive power and duty cycle where applicable, and run-time requirements during periods when ambient power might not be available for harvesting. A common scenario is a wireless sensor node that measures temperature in a room every several minutes and reports the temperature to a centralized receiver via a short range radio link. Total power consumption can be broken down as follows: 1) Microcontroller in standby mode 1uA 2) Temperature sensor 500nA 3) A/D conversion for temperature measurement 50uA x 20ms 4) Radio standby current 2uA 5) Radio transmit pulse 20mA x 20ms 6) Temperature measurement duty cycle once per 5 minutes 7) Transmit duty cycle once per 5 minutes 8) Average current required by energy harvesting 15uA and power management circuit, including EnerChip at >90% state-of-charge and assuming the charge pump is active 50% of the time Total average power is the sum of the above, calculated based on a system voltage of 3.3V. Pavg. = 3.3uW + 1.65uW + (165uW x 20ms/300 sec.) + 6.6uW + (66mW x 20ms/300 sec.) + 49.5uW = 65.5uW. The total energy consumed in any 24-hour period, using the foregoing assumptions, is: 65.5uW x 24 hours x 3600 sec./hour = 5.7 Joules. Depending on the output of the transducer and the voltage requirement for the system load, the input shunt diode and the output regulator might or might not be necessary. The circuit of Figure 6 includes the shunt regulator, power-on reset circuit, and input shunt diode typical of an energy harvesting application circuit using PV cells, but excludes the external battery. |
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Similar Description - AN-1036 |
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