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CBC915 Fiches technique(PDF) 7 Page - Cymbet Corporation |
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CBC915 Fiches technique(HTML) 7 Page - Cymbet Corporation |
7 / 16 page CBC915 EnerChip Energy Processor ©2012 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com DS-72-15 Rev F Page 7 of 16 Figure 3. CBC915 Energy Processor Application Circuit Electromagnetic generators used for typical energy harvesting applications have an output impedance of several hundred ohms to several thousand ohms with an impedance of approximately 1kΩ being typical. The output voltage of an electromagnetic generator will change linearly with input excitation. In most applications, voltages in the range of 500mV to 2V DC after rectification and filtering are typical. CBC915 operation with a thermoelectric generator (TEG) transducer (as shown in Figure 3) starts with a temperature differential across the TEG. This temperature differential causes the TEG to generate a voltage. When that voltage reaches approximately 400mV, the input charge pump will start, boost the input voltage, and store the accumulated charge in capacitor Cboost. When the accumulated charge voltage reaches approximately 2.4V, the charge accumulated on Cboost will be released onto the CBC915 power rail, activating the CBC915. Upon activation, the CBC915 outputs are initialized to a known state and the input mode pins will be interrogated in order to recognize the transducer type. The CBC915 will then pulse-width modulate the LX pin and initiate operation of the boost converter. When the boost converter voltage rises above 2.4V, power to the input charge pump is removed to reduce quiescent current. The CBC915 then checks for voltage on the output capacitor (Cout) by setting the EN VCAP pin high and reading the output capacitor voltage on VCAP pin. If the capacitor is charged, the CBC915 will leave the capacitor connected to the VOUT pin and EnerChips. If the capacitor has not been charged, the CBC915 will turn off the VOUT connection by setting EN VOUT/ pin high and isolate the capacitor from the EnerChips by setting EN CAP CHG/ pin high. The CBC915 will then check the boost converter voltage by monitoring the voltage at the VOUT pin and wait for the voltage to reach 4.06V at which time the CBC915 will enter the maximum peak power tracking state (MPPT) and pulse the MPPT/ status pin low and start adjusting the boost converter input impedance to match the output impedance of the TEG. This process can take several minutes. The MPPT state is only entered at initial power-on and values are subsequently stored. Note the MPPT state can be entered by five different events: • at initial power up; • when powered up while the Status/ input is held low • by command over the serial interface; • by detection of the input voltage being at a lower level than what it was at the initial MPPT startup while VOUT is not in regulation (voltage to low); • when the input voltage is at a higher level and VOUT is not in regulation (voltage too high). Cboost |
Numéro de pièce similaire - CBC915 |
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Description similaire - CBC915 |
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