Environmental Engineering Reference
In-Depth Information
Eciency of DC-DC Buck Converter at Different
Loading Conditions
100
80
60
40
DT15
DT20
DT25
DT30
20
0
10
20
30
Load Resistance (kΩ)
40
50
60
FIGURE 3.14
Efficiency of a buck converter with resistor emulation-based MPPT for various temperature
differences.
into account both the power loss across the buck converter and the power
loss in the associated control and PWM generation circuits mentioned by
Equations 3.11 and 3.12 , respectively, the performance comparison between
the TEH system with MPPT and without MPPT are tabulated in the bar chart
in Figure 3.16 . For all the temperature differences shown in Figure 3.16 , it can
be observed that the electrical power harvested by the TEH system with MPPT
is at least two to three times more than the TEH system without MPPT. Taking
into account the power losses of the buck converter and its associated circuitry,
Electrical Power Losses Associated with MPP Tracker
600
P PMOS
P filter
P comparator
P oscillator
500
400
300
200
100
0
DT15
DT20
Te m p erature Differences (K)
DT25
DT30
FIGURE 3.15
Power losses associated with an MPP tracker.
 
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