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| 型号： | V21B |
| 厂商： | Mide Technology Corporation |
| 文件页数： | 21/24页 |
| 文件大小： | 0K |
| 描述： | PIEZOELECTRIC ENERGY HARVESTER |
| 产品培训模块： | Volture EHE004 Piezoelectric Energy Harvesting Conditioning Circuit |
| 产品目录绘图： | Volture Series Sensors Side |
| 标准包装： | 1 |
| 系列： | Volture™ |
| 传感器类型： | 加速 |
| 传感范围： | 80Hz ~ 205Hz |
| 输出类型： | 模拟 |
| 工作温度： | -40°C ~ 90°C |
| 特点： | 压电式振动能量收集，全密闭式密封 |
| 封装/外壳： | 悬臂压电薄膜（晶片） |
| 安装类型： | 通孔 |
| 端子： | PC 引脚 |
| 相关产品： | VR001-ND - VIBRATION DATA LOGGER |
APPLICATIONS INFORMATION - LOAD ISOLATION EXAMPLE
Application Example
The steps to configure this circuit optimally for a given
load are presented below. This example assumes the
(Circuit adaptations for self-adjusting bias voltage may
be explored if the power gains exceed the consumption
of the added circuitry.)
following are known:
The LTC1540 features a programmable hysteresis
Required output voltage
Required output current
Nominal piezo open-circuit voltage
1) Set output voltage
The output voltage is determined by
band of up to 100mV. However, a larger hysteresis is
generally preferable to allow for smaller values of C1
and/or longer output ON-times, particularly for directly-
powered sensors. This can be accomplished by
bypassing the onboard hysteresis adjustment (R4=0
ohms; R5=open) and adding a small amount of
Vout = 1.23 1+
R7
R8
V
positive feedback via R3.
First select the desired center voltage (Vc) for C1 and
the desired hysteresis band (V hb ). Choose a value for
Where V f is the forward voltage drop of D8 under load.
In direct sensor-power applications where reverse
leakage into the circuit during its off-time is not a
concern, D8 may be omitted (but see important
warnings below). To minimize no-load supply current,
resistor values in the megaohm range should be used.
2) Choose inductor size and maximum inductor
current, following the guidelines of the LT1474
R1 such that the current across it at the trip point is
substantially greater than the comparator ’s input
leakage (1nA typ.), for example 100nA. The 5.7M value
shown is perfectly reasonable, but the following will
more formally dictate its upper limit. The LTC1540’s
internal reference (Vref) is 1.182V. The current through
R1 at the lower trip point is (Vc-(Vhb/2)-Vref) / R1.
Thus the upper limit for R1 is
datasheet. For greatest efficiency where space is not a
concern, first choose the inductor current sense
resistor R6 according to desired output current
R1
Vc
V hb
2
I R1
1.182
(R SENSE Equation above), then size the inductor
accordingly. For space-limited applications, size L1 as
dictated by the available space and set I PEAK as high
as the inductor will tolerate without saturating.
Choose R2 to set the center voltage, Vc. Neglecting the
small influence of R3,
3) Choose C1 bias voltage to be approximately ? the
open-circuit piezo voltage in its natural vibration
R2
1.182 R1
Vc 1.182
environment. In applications with highly variable
amplitudes, a trade-off must be made between
efficiency at higher amplitudes and the ability to
Choose R3 to set the hysteresis. At the lower
comparator trip point, the threshold voltage will be
equal to
harvest power from lower amplitudes: no charge will
be drawn by this circuit if the piezo open-circuit voltage
after rectification never reaches the set turn-on voltage.
REVISION N0. 002
REVISION DATE: 01-23-2013
V L
R2
R2
R1 R3
21
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