A Novel Predictive Digital Controlled Sensorless PFC Converter under the Boundary Conduction Mode

Abstract

This paper presents a novel predictive digital control method for boundary conduction mode PFC converters without the need for detecting the inductor current. In the proposed method, the inductor current is predicted by analytical equations instead of being detected by a sensing-resistor. The predicted zero-crossing point of the inductor current is determined by the values of the input voltage, output voltage and predicted inductor current. Importantly, the prediction of zero-crossing point is achieved in just a single switching cycle. Therefore, the errors in predictive calculation caused by parameter variations can be compensated. The prediction of the zero-crossing point with the proposed method has been shown to have good accuracy. The proposed method also shows high stability towards variations in both the inductance and output power. Experimental results demonstrate the effectiveness of the proposed predictive digital control method for PFC converters.

Topics of digital control approaches for future-oriented power converters

“…In order to solve the problems in detection of zero-crossing point, [19] presented a novel predictive control approach for BCM PFC converter. Figure 20 shows the predictive controlled BCM PFC converter.…”

“…Thus, it is difficult to implement AI technologies to high switching frequency power conversion units directly by the present technology level. Currently, it is important to use simple digital control approaches instead of AI technologies as the predictive control method for predicting the optimal operation points for maximum performance [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

“…Several advanced predictive control approaches for high performance prediction of optimal operation points for individual control system have also been suggested [15,[17][18][19]. The optimal operation point in each converter is important to keep the balance of shared power of converters.…”

“…The optimal operation point for improving the transient response can be calculated based on the information of the output voltage and predicted output current. A novel predictive control approach for boundary conduction mode (BCM) PFC converter has been presented in [19]. In the proposed approach, the inductor current is predicted by analytical equations instead of being detected by a sensing-resistor or sensing-circuit.…”

Detecção de Corrente Nula em Conversores Boost Operando em Modo Crítico

“…O conversor CC-CC Boosté composto basicamente por dois elementos armazenadores de energia (Indutor -L e Capacitor -C) e dois interruptores semicondutores (Transistor -S e Diodo -D) conforme mostra a Figura 1, tendo a finalidade de converter uma tensão de entrada baixa (V in ) para uma tensão de saída mais alta (V out ) (Wu et al, 2016). Como exemplo de aplicação,é amplamente empregado em sistemas de iluminação (Wang et al, 2017) e na integração de sistemas de energias renováveis (Hsieh et al, 2011;Tseng and Huang, 2014).…”