Environmental Engineering Reference
In-Depth Information
Main : 125 k
100 us/div
Mean(C1)
85.1762 mA
Mean(C2)
6.8502 V
Mean(C3)
5.39378 V
Freq(C4)
18.31427 kHz
Duty(C4)
74.9%
Mean(M1)
583.152 uEU
Mean(M2)
80.8596 EU
Source Power (
P
in
)
Source Resistance (
R
s
)
PWM Gating Signal
Source Voltage (
V
in
)
Output Voltage (
V
o
)
Source Current (
I
in
)
0
100
200
300
400
500
600
700
800
Time/µsec
FIGURE 3.9
Operation of a resistor emulation-based MPP tracker at 56-k
loading.
Energy Harvesting
Source
Buck Converter with Resistor
Emulation-Based MPPT
Energy
Storage
Regulating Buck
Converter
V
o
2.8 V
SYNC SW
10 µH
L
30 mH
+
PMOS
Si1563DH
Z
S
V
IN
Wireless
Sensor
Node
TI
CC2500
Super
Cap
0.1 F
5.5 V
22 pF
RUN
3.3 uF
V
OC
+
-
47 uF
D
LTC187.7
1 MΩ
220 pF
I
TH
V
FB
470 kΩ
PWM
-
GND
180 kΩ
V
Ropt
Microcontroller TI
MSP430F2274
(Low
power mode, 100 Hz)
4.7 µF
+
d
18 kΩ
LTC6906
Pulses
-
V
+
OUT
DIV
1 MΩ
15 nF
GND
SET
PWM Generation (10 kHz)
FIGURE 3.10
A schematic diagram of the TEH system.
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