Hybrid Energy Harvesting System - Energy Harvesting Autonomous Sensor Systems - page 153

Energy
Storage

Wind Turbine-
Generator

AC-DC Active MOSFET
Rectifier

Boost Converter with MPPT

Regulating Buck Converter

V V in out

L
10 mH
NMOS
Si1563EDH

SYNC SW

PMOS PMOS +

+

10 µH

R

V IN
RUN

Z s g1 g2 C

v s Super

Cap
1.5 F
5.5 V

sense

22 pF

in

LTC1877

R

PWM

sense

NMOS NMOS 270 kΩ

I
TH

V
FB

g3 g4

100 kΩ

-

GND

10 Ω

3 V

+
- 3 V

10 kΩ
10 kΩ

+
-

220 kΩ

+
-

3 V

OP296

V

220 kΩ OP296

Ropt

Wireless Sensor
Node
TI CC2500

+
-

+
-

D

100 kΩ 100 kΩ 100 kΩ LMC7215

100 kΩ

150 nF Current and Voltage

Sensing

180 kΩ

LTC6906 Pulses

+

V

OUT

1 MΩ 120 pF

GND

V V

opt, ref

+

err

PI
Controller

100 kΩ

V/I
+

DIV SET

R

V

fb

R R

fb

PI
Controller

opt, ref err

P mppt 6.8 µF

V

P

PWM Generation (10kHz-100 kHz)

mppt

Microcontroller TI MSP430F2274
(Low Power Mode, 100 Hz)

3 V

6.8 µF V opt

+
-

LMC7215

39 kΩ
Solar Panel

39 kΩ

Boost Converter with MPPT

v pv

L
2.2 mH

R

I D

s, pv

I L

NMOS
Si1563EDH

220 µF

PWM

FIGURE 5.12
Schematic diagram of the wind-powered wireless sensor node augmented with an SEH subsystem.