参数资料
| 型号： | EHE004 |
| 厂商： | Mide Technology Corporation |
| 文件页数： | 19/24页 |
| 文件大小： | 0K |
| 描述： | BOARD ENERGY HARVESTING |
| 产品培训模块： | EHE004 Piezoelectric Energy Harvesting Conditioning Circuit |
| 特色产品： | Energy Harvesting Power Products |
| 标准包装： | 1 |
| 系列： | Volture™ |
| 主要目的： | 电源管理，能量收集 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | LTC3588 |
| 主要属性： | 用户可选择的输出电压 |
| 次要属性： | 最多 100mA 输出 |
| 已供物品： | 板 |
APPLICATIONS INFORMATION - LOAD ISOLATION EXAMPLE
VCC
R3
15M (Optional)
BAT43W
-IN
6 REF
Piezo Bimorph
X1
X2
D1
BAV199
BAV199
D2
+ C1
100uF
V REF
R4
100K
1
3 OUT
+IN
5 V+
HYS
V-
LTC154 0CMS8
8
7
2
VCC 7
R6 6
1 3
RUN 8
U2 D6
VIN VFB
SENSE LBO
LBI SW
RUN GND
LTC1474CMS8
1
2
5 SW
4
VFB
VOUT
+ C3
1uF
D8
BAT43W
V4
12pF
VOUT
GND
C2
R5
2.2M
10nF
GND
Figure 2: Simple high-efficiency voltage conversion and load-isolation circuit for piezo energy harvesting applications. The C1
voltage setpoint in this example is fixed, but could be made adaptive using additional circuitry.
deplete C1 until its voltage drops below the hysteresis
band, at which point the converter is disabled and the
cycle repeats. Thus C1 is maintained at approximately
V oc /2. The typical output is a train of voltage-regulated
pulses ideally suited to charging a battery or capacitor,
or directly powering an intermittently-operating sensor.
least as much power as is being supplied (Figure 5).
The converter duty cycle is approximated by the ratio
of input power (G-level) vs. output power (voltage *
current * time), less any small conversion losses and
leakage. When the input power exceeds the output and
losses, duty cycle will be 100%, and excess voltage at
C1 is safely disposed of through D5.
Since the voltage at C1 is held approximately constant,
the effective load seen by the piezo is not significantly
affected by activation of U2 or changes to the actual
load. Additionally, the voltage maintained on C1
R6 sets the peak current through inductor L1, and can
be specified according to the equation:
ensures charge is drawn from the piezo beam only
when its voltage exceeds C1’s voltage by one diode
drop, which occurs only when the beam approaches its
R SENSE
0.067
I MAX
0.25
maximum deflection. Thus a limited amount of charge
is drawn on each cycle of the piezo beam, timed to
coincide with the maximum deflection of the beam.
This combination of factors helps prevent excessive
mechanical damping of the beam, allowing usable
output voltages to be output at lower vibration
amplitudes while the piezo beam is driven near its
mechanical resonance.
U2 provides a regulated output voltage determined by
the ratio of R7 and R8. The power output per G of
vibration will remain relatively constant across G-levels
and loads, provided the load is capable of drawing at
where I MAX is the maximum desired output current to
the load. Generally, the peak inductor current should be
set to maximum to improve efficiency with smaller
(<300uH) inductors in space-limited applications;
refer to the LT1474 datasheet for more thoughtful
trade-offs between peak current and inductor size.
Battery-charging applications requiring a (pulsed)
constant-current charge phase, or where both the
charge circuit and the load are directly connected
across the battery pack, may require a lower I PEAK
setting to reduce voltage ripple caused by the charge
pulses.
REVISION N0. 002
REVISION DATE: 01-23-2013
19
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