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Transcript
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 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) 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%