Wind Energy Harvesting System - Energy Harvesting Autonomous Sensor Systems - page 58

Energy Harvesting
Source

AC-DC Active Rectifier MPPT Boost

Converter

Energy
Storage

Regulating Buck
Converter

V in

V out 3V

L
10 mH

SYNC SW

10 µH

PMOS PMOS + +

V IN

Z s

g 1 g 2 C in

R sense Wireless

Sensor
Node
Tl
CC2500

ν s

Super
Cap
1.5 F
5V

22 pF

RUN

47 uF

NMOS
Si1563EDH

220
pF

PWM

R sense

LTC1877 270 kΩ

NMOS NMOS

I TH
GND

V FB

g 3 g 4

270 kΩ

- -

10 Ω

3 V

+

-

10 kΩ
10 kΩ

220 kΩ

+
OP296

+
OP296

3V

220 kΩ

V Ropt

+

+

D

-

100 kΩ 100 kΩ 100 kΩ 100 kΩ LMC7215

-

180 kΩ

LTC6906

150 nF

Pulses

Current and Voltage Sensing

V + OUT

GND

1 MΩ

120 pF

100 kΩ

V / I

SET

DIV

R fb

R opt, ref

+ -

R err

PI
Controller

6.8 µF

PWM Generation (10 kHz-100 kHz)

P mppt

Microcontroller Tl MSP430F2274
(Low power mode, 100 Hz)

FIGURE 2.20
Schematic diagram of the self-powered wind sensor system.