V20W Mide Technology Corporation, V20W Datasheet - Page 14
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V20W
Manufacturer Part Number
V20W
Description
PIEZOELECTRIC ENERGY HARVESTER
Manufacturer
Mide Technology Corporation
Series
Volture™r
Datasheet
1.V25W.pdf
(24 pages)
Specifications of V20W
Sensor Type
Acceleration
Sensing Range
75Hz ~ 175Hz
Output Type
Analog
Operating Temperature
-40°C ~ 90°C
Features
Piezoelectric Vibration Energy Harvesting, Hermetically Sealed
Package / Case
Cantilever Piezo Film (Wafer)
Mounting Type
Through Hole
Termination
PC Pins
Lead Free Status / RoHS Status
Lead free by exemption / RoHS compliant by exemption
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
V20WL45
Manufacturer:
VISHAY/威世
Quantity:
20 000
Part Number:
V20WL45-M3
Manufacturer:
VISHAY/威世
Quantity:
20 000
APPLICATIONS INFORMATION -
Switched Capacitor Boost Circuit for One-
Shot Sensors and Low Vibration Levels
It is often difficult to make use of low-voltage energy
scavenging sources, such as piezo energy harvesters
at low vibration amplitudes, solar cells in overcast or
indoor environments, or Seebeck devices, etc., as
most microcontrollers and sensors require minimum
voltages of 1.8V or greater to operate. Using these
sources requires a voltage boost converter with a
minimum start-up voltage, low start-up current
requirement, and graceful handling of undervoltage and
slow input voltage rise times.
The circuit shown, based on the Seiko Epson S-882Z
series charge pump IC, provides bursts of power
starting at approximately 2.4VDC (ending at 1.6-2
VDC) from input voltages as low as approximately
380mV. This IC provides boosting using small on-chip
switched (“flying”) capacitors, rather than inductive
boost conversion. Thus the initial input current
requirements are reduced compared to a typical boost
conver ter, requiring only a small power-supply
X1
X2
Piezo Bimorph
QPXX_RA
J3
1
GND
BAT54STA
REVISION N0. 001
D1
D2
SWITCHED CAPACITOR BOOST CIRCUIT
REVISION DATE: 06-03-2010
VH
bypass capacitance to reliably start up. The circuit
can begin operating almost immediately when power
becomes available. This circuit is ideal for directly
powering small sensors that can perform their
function (e.g. record or transmit a measurement) in a
known amount of time and power. It could also be
used to extend battery life, or as a trigger source for
devices with their own battery/supercap power
source.
When the voltage at VIN exceeds the minimum start-up
voltage, the IC begins pumping charge to a storage
capacitor connected across the CPOUT pin. When the
capacitor voltage reaches 2.4V, the output is enabled
and this voltage is applied to the load. The load is
automatically disconnected when the storage capacitor
voltage drops below approx. 1.8V (see Figure 6). This
behavior allows the circuit to directly power most 3.3V
microcontroller circuits, with a typical operating voltage
range of 1.8V ~ 3.6V, without exposing the circuit to
significant undervoltage or unfavorable voltage rise-
time conditions.
10uF
C1
GND
C3
100uF
4
5
VIN
CPOUT
S-882Z
VOUT
U1
GND
VM
3
2
1
VCC
GND
14