基于电机母线电流的低成本纹波-方波转换策略

Low-cost Ripple-to-square Wave Conversion Strategy Based on Motor Bus Current

为降低汽车产品自主防夹的成本,对纹波防夹的关键技术——纹波转换技术展开研究。提出了低成本的硬件纹波-方波转换方案,采用低成本的电容电阻设计采样电路、微分电路、滤波电路,有效滤除信号中的高频噪声及直流成分。同时,为进一步降低硬件成本,提出了基于软件的低成本纹波-方波转换方案,通过软件处理实现硬件的滤波、微分、比较器等功能,进而实现低成本的纹波-方波转换。最后,通过试验表明,正常运行阶段,基于硬件的纹波转换方案和基于软件的纹波转换方案均能实现纹波-方波转换,基本无误转换问题;电机启动阶段,硬件纹波转换方案存在两个误转换,软件纹波转换方案存在四个误转换,均远小于系统允许误差。两种低成本转换方案均能满足系统要求。

In order to reduce the cost of anti-pinch control of automobile products,the ripple conversion technology in the key technology of ripple anti-pinch was studied.A low-cost hardware ripple-square wave conversion scheme was proposed.The sampling circuit,differential circuit and filtering circuit were designed by using low-cost capacitance and resistance to effectively filter out high-frequency noise and DC components in the signal.At the same time,in order to further reduce the hardware cost,a low-cost ripple-to-square wave conversion scheme based on software was proposed.The hardware functions such as filtering,differential,and comparator were realized through software processing,thereby achieving low-cost ripple-to-square wave conversion.Finally,the experiment shows that in the normal operation stage,the ripple conversion scheme based on hardware and the ripple conversion scheme based on software can realize the ripple-square wave conversion,and there is basically no error conversion problem.In the motor start-up phase,there are two false conversions in the hardware ripple conversion scheme,and four false conversions in the software ripple conversion scheme,which are far less than the allowable error of the system.Both low-cost conversion schemes can meet the system requirements.