Allegro的霍尔电流传感器在电池管理系统（BMS）（BATTERY
MANAGEMENT SYSTEM）中的应用
l常用电流互感器（CT）来检测电流
l电流互感器是通过磁场变化来检测电流的，不能检测电流中的直流分量
l直流分量会给计量带来很大的误差
lAllegro电流传感器能准确地检测交流电和直流电
ACS724/5:
高精度带共模抑制电流传感器（SOIC8)
§使用差分霍尔检测:
>>10x
外部磁场抑制*
§工作电压:
3.3V(ACS725)
和
5V(ACS724)
§温度:
-40 to 150
°C
§120
kHz
带宽
§无磁芯设计：没有磁滞效应
§ACS712的升级版，脚位兼容
§输出误差
+/- 1%
§原边导通电阻0.85
mW,
§2400VRMS绝缘电压:
UL60950-1 2nd
认证,
工作电压500
Vrms
§爬电距离3.9
mm
（ACS712
只有2
mm).
ACS724
差分霍尔技术
BMS
for
EVs and HEVs
using
Li-Ion and NiMH
because of high energy densities.
BMS – Protection and Detection
Protection
A BMS may protect its battery by preventing it from operating
outside its
safe
operating area, such as:
Over-current
Over-voltage
(during charging)
Under-voltage (during discharging)
Over-temperature
/ Under-temperature
Over-pressure (NiMH
batteries)
Ground fault or leakage current
detection
The
BMS may prevent operation outside the battery's safe operating area
by:
For Current, including
an
internal
switchSuch
as
a
relay or
solid
state device) which is opened if the battery is operated outside
its safe operating
area
![]()
![]()
That’s why ACS724 or ACS725
New types of voltage and current measurement circuits are used
to
provide
higher accuracy. This includes an automated calibration
procedure
that stores correction factors in flash memory.
ACS724/25
定位分析
§
差分霍尔检测技术使得电流传感器能在外界磁场干扰下保持正常工作
§
封装通过汽车级认证，可以用在汽车领域
升级的精度，在室温和高温范围，可达+/-1%
(+/-3sigma)
Target Markets
![*]()
Industrial,
Consumer, Computer (IC&C)
![*]()
Automotive,
BMS
Target Applications:
§汽车市场主要目标是小于50A的应用
§Braking,
including brake by wire, parking and low power steering
applications.
§Fluid
and fuel pump applications.
§This
part works well for
hybrid applications
that require the sensor to be on the high voltage side of the
battery.
Seat warmers
on the main battery can use this part.
Plug in chargers
or
on board chargers
are also a possibility as they charge at 20 Amp house
circuits.
§工业和消费类主要目标是不需要高带宽的应用
§Load
monitoring in power supply applications < 50 Amps
§Chargers
and line current sensing at 297 VRMS that require only single
protection
§Motor
control applications that require up to 80 KHz BW and up to 297
VRMS or 420
Vpeak
or DC voltage operation with single protection.
ACS724/25
优势总结
![*]()
有效抵御外界磁场干扰，无需外加磁场屏蔽
![*]()
单向和双向电流检测均可
![*]()
3.3
V(ACS725)和5
V(ACS724)齐全
![*]()
原边导通电阻0.8mOhm.
![*]()
爬电距离4mm
![*]()
利用先进的温度补偿，获得良好的精度.
如需以上GENESIC公司的器件，请联系代理商：
赵先生 zhaojiaxi@163.com
上海瑞齐德电子有限公司
Mobile:13701069452
http://www.richwoodchina.com
我们所代理的优势产品
GENESIC公司的SIC碳化硅电子组件、功率模块组件。
Global Power公司的SIC碳化硅晶圆,电子组件、功率模块组件。
ALLEGRO公司的电机驱动器芯片、电流传感IC，霍尔效应传感器IC，LED灯/LED背光驱动IC等。
SBE公司的圆环状的功率电容器(环保/双能源汽车电机驱动电容器HEV/PHEV Inverter Power Cap)。定制军工品质电容器。
CDE公司的各类电容器、吸收电容等。
FOX
Electronics 公司的各种固定、标准式、可调式、编程式石英晶体振荡器，XpressO振荡器、TCXO、VCXO、恒温晶振OCXO
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