# Sensorless Control for DC-DC Boost Converter via Generalized Parameter Estimation-Based Observer
## 6 Conclusions and Future Work  
In this paper, the sensorless control problem of DC-DC boost converters was addressed. A PI-PBC was proposed to stabilize this system. To avoid the need for the current sensor, the GPEBO was designed to reconstruct the information of the current. Different from most existing approaches, this state observation problem is changed to be that of parameter estimation. In addition, the FTC of this observer is ensured. By incorporating the estimate of the current into the above feedback controller, the sensorless control scheme was achieved. With this controller, it was proved that the exponential stability of the closed-loop system is ensured. The simulation and experimental results on the boost converter validate the effectiveness of the presented scheme.  
Our study has three technological limitations:  
* Although the proposed controller is insensitive to the perturbations of the circuit parameters including \(L,C,E\), the implementation of the designed GPEBO depends on the exact knowledge of these parameters.  
Figure 10: Response curves of boost converter under the proposed sensorless controller (experiment). (a) Output voltage \(v\), (b) estimated current \(i\), (c) duty ratio \(d\).  
Figure 9: Schematic diagram of the experimental platform.  
* In this paper, a full-order GPEBO is proposed to estimate two states. In fact, the state \(x_{2}\) can be measured. Hence, to avoid the heavy computation task in digital signal processors, a reduced-order observer is desired to only reconstruct the state \(x_{1}\). This does not mean that the full-order GPEBO is useless. Indeed, the estimate \(\hat{x}_{2}\) can be used to view the performance of the power system. An alternative method is still needed to suit different application scenarios.
* The proposed method can deal with the sensorless control problem of boost converters with resistance load. However, the constant power load (CPL) exists in many practical applications.  
In future work, the design of an adaptive GPEBO and reduced-order GPEBO for converters with resistance and CPL will be provided to solve the above problems. Additionally, the proposed result will be extended to the case of the converter under DCM.  
Conceptualization, W.H.; methodology, W.H.; software, Y.S., C.J.; validation, M.M.-L., J.M.-V.; formal analysis, W.H.; investigation, M.M.-L., J.M.-V.; data curation, M.M.-L., J.M.-V.; writing--original draft preparation, X.Z.; writing--review and editing, W.H.; supervision, J.M.-V.; project administration, W.H.; funding acquisition, W.H. All authors have read and agreed to the published version of the manuscript.  
This research was supported in part by the National Natural Science Foundation (NNSF) of China (Grant No. 61903196), the Natural Science Foundation of Jiangsu Province of China (Grant No. BK20190773), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. 19 KJB510042), the Startup Foundation for Introducing Talent of NUIST (Grant No. 2018r084).  
Not applicable.  
The third author would like to give thanks for [PERSON]'s help.  
The authors declare no conflict of interest.