CBC-EVAL-10 Cymbet Corporation, CBC-EVAL-10 Datasheet - Page 12

• Manufacturer Part Number: CBC-EVAL-10
• Description: ENERCHIP CC SEH EVAL KIT
• Manufacturer: Cymbet Corporation
• Series: EnerChip™ CCr
• Type: Energy Harvestingr

Specifications of CBC-EVAL-10

• Main Purpose: Power Management, Renewable Energy
• Embedded: No
• Utilized Ic / Part: CBC3150, CBC51100
• Primary Attributes: Thin Film Rechargeable Solid State Battery
• Secondary Attributes: Solar Energy Harvester
• Maximum Operating Temperature: + 70 C
• Product: Power Management Development Tools
• For Use With/related Products: EnerChip CBC51100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 859-1012

Using Other Energy Harvesting Transducers
CBC-EVAL-10 includes a standard amorphous silicon solar panel (Sanyo AM1815 type) configured as 8 series-
connected cells on a glass substrate. The output voltage and current vary with incident light intensity, wave-
length, and load impedance.
DC sources other than the PV cell provided with the CBC-EVAL-10 may also be used as the energy harvesting
power transducer. While the CBC-EVAL-10 module has a Zener diode at the transducer input to limit high volt-
age excursions at 5.6V, it is recommended that any DC transducer input be limited to 5.5V under all antici-
pated operating conditions. The minimum input voltage required to activate the internal charge pump of the
CBC3150 is 2.5V. At <2.5V, the EnerChips will not charge and the power management circuit will not function.
It is recommended that the input power source have a maximum power operating point above 3.0V. Operating
characteristics for most transducers are typically available from the manufacturer’s data sheet. An example
photovoltaic cell operating curve is shown below. Output impedance, operating voltage, and peak power point
can also be verified by empirical measurements. To determine the peak power point of a given PV cell, measure
the load voltage and current as a variable load impedance across the transducer is swept over a broad enough
range where the peak power point can be found by finding the maximum product of the measured load voltage
and current.
Once the peak power point of the PV cell has been determined, the CBC3150 operating point can be adjusted
to match the PV cell. This is done by adding a resistor divider R2 and R3 to the CBC-EVAL-10 module. As
shipped, those resistors are not populated. Cut the solder trace in the R2 location prior to adding the resistor.
Resistor values should be sized according the guidelines in the CBC3150 data sheet. It is important to note
that the resistor divider will present a permanent parasitic load to the PV cells and therefore the calculation
should be made to determine whether the standard CBC3150 impedance matching setpoint of ~3V - though it
might not be at the peak power point of a particular PV cell - is preferred to the more optimized setpoint when
considering the additional parasitic load on the PV resulting from the added resistor divider.
DS-72-20 Rev A
©2011 Cymbet Corporation • Tel: [phone] • www.cymbet.com
Current-Voltage Curve
CBC-EVAL-10 EnerChip CC EH Evaluation Kit
V
I
V
I
P
SC
OP
OC
OP
MAX
: Short-circuit current
: Optimum operating current
: Open-circuit voltage
: Optimum operating voltage
: Maximum operating power
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