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针对无电流传感器的DC/DC转换器,提出了一种基于扩展卡尔曼滤波的电感电流观测器.首先,对升压型DC/DC转换器进行了建模,得出了含非线性项的状态空间方程;然后,为了更精确地预测电感电流提出了一种更适合非线性系统的扩展卡尔曼滤波器算法,在减少由AD转换器引入的测量噪声的同时,利用扩展卡尔曼滤波器的状态方程对电感电流进行观测;最后,对提出的电流观测器进行了Simulink仿真验证.结果表明:对电路的输出电压采样后进行扩展卡尔曼滤波可以有效减小由AD转换器引入的噪声并完成对电感平均电流的观测.在硬件实现过程中无需电流传感器,可以有效降低系统成本.
Aiming at current sensorless DC / DC converter, an inductive current observer based on extended Kalman filter is proposed.Firstly, the step-up DC / DC converter is modeled, Then, in order to more accurately predict the inductor current, an extended Kalman filter algorithm is proposed which is more suitable for nonlinear systems. In order to reduce the measurement noise introduced by the AD converter, the extended Kalman filter The state equation is used to observe the inductor current.Finally, Simulink simulation is performed on the proposed current observer.The results show that the extended Kalman filter after sampling the output voltage of the circuit can effectively reduce the noise introduced by the AD converter and complete The average inductor current sensing in the hardware implementation process without current sensor, can effectively reduce system costs.