Predictive Direct Torque Control Application-Specific Integrated Circuit With a Fuzzy Proportional–Integral–Derivative Controller and a New Round-Off Algorithm

Abstract

This study developed a predictive direct torque control (PDTC) application-specific integrated circuit (ASIC) with a fuzzy proportional-integral-derivative (PID) controller and a new round-off calculation circuit for improving the ripple response of a hysteresis controller when sampling and calculating delay times in an induction motor drive. The proposed PDTC ASIC not only calculates the stator's magnetic flux and torque by detecting three-phase currents, three-phase voltages, and rotor speed but also eliminates large ripples in the torque and flux by using the fuzzy PID controller. Furthermore, the proposed round-off algorithm reduces the calculation error of the composite flux. A fuzzy voltage vector switching table is proposed not only to speed up the calculating speed but also to resolve the instability generated by its large torque and flux ripples. The Verilog hardware description language was used to implement the hardware architecture, and the aforementioned ASIC was fabricated using the 0.18-μm 1P6M CMOS process of the TSMC by employing the cell-based design method. The predictive calculations, fuzzy PID controller, fuzzy voltage vector switching table, and round-off calculation algorithm improved not only the ripple issue faced in traditional direct torque control but also the control stability and robustness. The measurement results indicate that the proposed PDTC ASIC has an operating frequency, a sampling rate, and a dead time of 50 MHz, 100 kS/s, and 100 ns, respectively, at a supply voltage of 1.8 V. The power consumption and chip area of this ASIC are 1.0027 mW and 1.169 × 1.168 mm 2 , respectively. The main advantages of the proposed PDTC ASIC are its low power consumption, small chip area, robustness, and convenience.INDEX TERMS Direct torque control (DTC), Predictive calculation, fuzzy PID controller, round-off algorithm, application-specific integrated circuit (ASIC), induction motor (IM), hardware description language (HDL).

Direct Torque Control of Induction Motor Using ConvLSTM Based on Gaussian Pillbox Surface

“…niques to increase motor efficiency by simultaneously detecting rotor flux, motor speed, and time constant [27]. Compensation with rotational back EMF by using a deadbeat controller has been presented by Muduli et al ey have also proposed a unified flux algorithm which can eliminate status flux ripple and rotor torque ripple [28].…”

Modified Predictive Direct Torque Control ASIC with Multistage Hysteresis and Fuzzy Controller for a Three-Phase Induction Motor Drive

“…Electronics 2022, 10, x FOR PEER REVIEW 3 of 19 trol of the stator flux and instantaneous torque without a complex algorithm [21]. A modified DTC ASIC with five-stage fuzzy hysteresis and a fuzzy PID speed controller was used to reduce the torque and flux ripples induced by the limited vector voltages and low speed response in a traditional DTC [22].…”

“…Table 1 summarizes the sector selection for the proposed MPDTC ASIC. The output sector can be easily selected using this table [21].…”

“…Next, the feasibility condition for the design parameters was verified, and the optimized design parameters were rounded off to the nearest feasible design values [20]. Lastly, an application-specific integrated circuit (ASIC) was used to enable the direct control of the stator flux and instantaneous torque without a complex algorithm [21]. A modified DTC ASIC with five-stage fuzzy hysteresis and a fuzzy PID speed controller was used to reduce the torque and flux ripples induced by the limited vector voltages and low speed response in a traditional DTC [22].…”