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TE Module


Electric
Control Sys.
Fan
Control System is largely dependent upon
nominal voltage output of TE
Purpose: Provide steady, constant electric
current to fan to meet airflow needs

Simplest Design – TE directly connected to fan
TE Module

Fan
No electronic components in this system

Power Conditioner
TE Module

Power
Conditioning
Fan
PC System will be one of 3 designs:
 Smoothing – flatten output ripple from TE
 Step Down – Voltage regulation of TE output to match
fan’s req’d V
 Step Up – circuit/switching that increases V supply for
fan

Power Conditioning with Battery
TE Module
Power
Conditioning
Fan
Battery
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Will require a switching (battery power-> circuit
power)
Charging circuit

“Complete” – Battery & Aux. Power
TE Module
12V DC Output

Power
Conditioning
Fan
Battery
Same circuitry as previous platform, plus:
 Step up & Regulation circuitry for 12V output

The battery is not required, but including it
constitutes the most complex design

Considerations:


Platform selection based on output of TE and
electrical needs of fan
Assumptions

Will need a battery for instant fan start-up
 TE takes time to develop ΔT

Based on most TE characteristics, a step up circuit is
likely needed
 Smoothing TE ripple current->converter->V regulator

Added complexity means increased cost
 Complex design may be suitable for vendors, the
project needs will then change

General Needs (for a Haitian family)
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1. The fan must have a constant, steady current
supplied to it. 50%
2. The current must be supplied for the entire
duration of stove operation. 30%
3. The system starts the fan immediately (i.e. has a
battery). 15%
4. The system has an auxiliary power supply. 5%