Efficiency Optimization in ZVS Series Resonant Inverters With Asymmetrical Voltage-Cancellation Control

Abstract

This paper presents a time-domain analysis and a computerized search algorithm for optimizing the efficiency in zero-voltage switching (ZVS) full-bridge series resonant inverters with asymmetrical voltage-cancellation (AVC) control for different load quality factors. The optimum AVC control found allows all the switches to be turned on with zero voltage with the minimum switching frequency. In order to minimize losses, the switching frequency is kept as close as possible to resonance. The optimum AVC control is compared with previous fixed or narrow frequency range control strategies to show that it improves performance over all the output power range for different loads. The detailed steady-state analysis carried out here increases the precision of the first-harmonic analysis of a previous work, which is especially important with distorted output currents due to low load quality factors or highly asymmetrical modulation strategies. The theoretical results are verified experimentally.Index Terms-Asymmetrical voltage-cancellation (AVC) control, series resonant inverters, steady-state analysis, zero-voltage switching (ZVS).

Linearization and Control of Series-Series Compensated Inductive Power Transfer System Based on Extended Describing Function Concept

“…There are mainly three narrow frequency-range control techniques used for the control of resonant converters, namely asymmetrical duty cycle (ADC), asymmetrical clamped mode (ACM), and symmetrical clamped mode (SCM) control. It has been shown in [19][20][21] that only ACM control has the best performance in terms of the least losses in the inverter switches as compared to other two control strategies and has the lowest …”

“…Table 1 gives the parameters of the experimental setup. Using theories presented in [19][20][21], and depending on availability of capacitors in the market, f S was calculated to be 41.426 kHz for ensuring ZVS for any variation of α, and the primary coil was tuned to a resonant frequency of 39.031 kHz.…”

“…To verify for the ZVS in the inverter switches, the method described in [21] has been used. According to [19], polarity of current at four switching instance (t 0 , t 1 , t 2 , t 3 ) shown in Figure 3 should be according to the Equation (27) for the switches to operate under ZVS condition.…”

Power control techniques used in high frequency induction heating applications

“…This method achieves higher efficiency as compared to PSC and ADC [30] by reducing conduction loss and turn off losses without losing ZVS condition.. In AVC, the voltage is only clamped to zero on one side, asymmetrically [31]. …”

Electrónica de potencia para el calentamiento por inducción doméstico: revisión del estado del arte

“…2013. mayor utilización de la electrónica y conmutación por ZVS. Barragán et al [43] desarrollaron un algoritmo de optimización de la eficiencia de un IRS en onda completa en puente con ZVS y un control por cancelación de voltaje asimétrico para diferentes factores de calidad de la carga analizada. Con el desarrollo se logró una eficiencia del 93 % con el 10 % de la carga y el 96 % con el 100 % de la carga [43].…”