HEV子系统中的电子电机内容需要电流检测 - yaboAPP亚博,yabo亚博网站,亚博电竞官网客户端

HEV子系统中的电动机内容增加需要电流检测

由Shaun Milano.
亚博棋牌游戏Allegro Microsystems，LLC

This article explores recent applications in HEV and EV vehicle propulsion and passenger convenience systems. Allegro™ MicroSystems, LLC has developed a family of fully-integrated current sensing ICs that are ideally suited for such applications.

介绍

为了控制HEV和全EV车辆中的传动系，众所周知，需要特别是在起动发生器和主电动驱动电机发生器应用中的电流检测。亚博尊贵会员然而，即使在温和的混合动力车中，为了保持系统运行，当内燃机（冰）不使用时，许多子系统已成为全电动。例如，如果驾驶员和乘客在坐在速度下，驾驶员和乘客在炎热的天气中保持冷却，则加热，通风和空调（HVAC）系统必须在冰空间期间运行。因此，这些子系统还需要精确的电流检测，以确保对电动机的有效和准确的控制。亚博棋牌游戏Allegro Microsystems，LLC开发了一个完全集成的电流传感IC系列，非常适合HEV子系统应用。亚博尊贵会员

图1显示了通过DC-TO-DC转换器关闭主电池的DC子系统的简单框图，并指示电流传感器。亚博尊贵会员在变速器流体和发动机油泵中，以及在HVAC系统中，峰值负载电机电流可达150，并且在正常操作中的范围为20至50 A。驻车制动电机通常在30至50峰值下运行，通常在10到20°。对于远高于100 VDC的电池电压，如在某些HEV和全EV中，传感电池电流和DC-TO-DC转换器电流也需要电流（高压）隔离。

Figure 1. HEV and EV Current Sensing Applications

霍尔效应电流感应的革命

Conventional Hall-effect sensors, when used in current sensing applications, historically have exhibited general limitations in both accuracy and output signal bandwidth. However, Allegro MicroSystems has developed a broad family of Hall-effect current sensor integrated circuits (ICs) that overcome these issues. The features and benefits of these industry-leading Allegro current sensors include:

•信号处理和包装设计创新启用> 120 kHz输出带宽

•最高电流分辨率，市场中最低的噪声光谱密度霍尔传感器IC

•专有的,small footprint sensor IC packages with galvanic isolation

• Reduced power loss: through-hole and surface-mount low-resistance integrated conductor packages

•精确的工厂编程传感器IC增益和跨越全温度范围的偏移量

A key advantage of the full integration of the current sensor IC is the testability of the device. The device is factory trimmed at both room and hot temperature to optimize the gain and offset of the sensor across operating temperature conditions. This provides a highly accurate solution in a very small package. Figure 2 depicts the wide range of proprietary package configurations in the Allegro current sensor IC family and displays the current magnitude that can be sensed using each package type.

Figure 2. Allegro Current Sensor IC Packages

完全集成电流传感器集成电路

The required current sensing and isolation voltage ranges determine the optimum Allegro current sensor IC solution. In low current applications, such as fuel pumps or plug in vehicle chargers, fully integrated surface mount sensors ICs can be employed, for example, the SOIC8 package shown in figure 2. Flip chip technology is employed in these surface mount sensor ICs and they have integrated 1.2 mΩ conductor resistance for low power loss. The flip chip construction improves the magnetic signal coupling and provides isolation because the die is located above the primary current conductor, and plastic mold compound fills the space in between.

For medium current sensing, between 50 and 100A, the ACS758 family of devices in the CB package can be employed. The ACS758 can be used in HVAC as well as oil and transmission fluid pumps. Figure 3 shows the unique construction of the CB package. The device incorporates a 100 µΩ conductor, a ferromagnetic core, and a Hall-effect linear sensor IC into a small form factor, galvanically isolated package. This package is capable of operating at the higher HEV battery voltages: it can survive standard UL type testing for 60 seconds at 4800 VRMS applied between the current leadframe and the signal leads. This sensor IC has been used in DC-to-DC converters, as well as main inverter motor stator coil applications at battery voltages exceeding 350 VDC. Motor stators are typically made with expensive rare earth magnets such as nickel-plated neodymium. Replacing the stator with a coil not only eliminates exposure to rare earth metal price and supply fluctuations, but also provides a means of taking active control of the stator, which improves motor efficiency and torque profiles in HEVs.

图3. Allegro ACS758 CB包装

对于200a的感测电流，Allegro电流传感器IC霍尔霍尔线性装置可以用于设计成满足应用的所需电流传感范围的铁磁芯的间隙中。该技术最常在主逆变器中使用，如图2所示。无论需要电流检测范围是多少，都可以采用Allegro霍尔传感器IC。

概括

Allegro的最新一代霍尔效应电流传感器IC技术为赫夫斯系统的传感电流提供了显着的优势。Allegro的集成封装具有电流隔离使能低功耗，小型电流检测解决方案能够感测到200个连续电流。Allegro MicroSystems的Hall技术最近的改进也导致了行业领先的高亚博棋牌游戏带宽，高分辨率电流传感IC的发展。

文章发表在电动和混合动力汽车杂志，2013年1月。根据许可转载。

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