A ZVS‐ZCS phase shift full bridge DC‐DC converter with secondary‐side control for battery charging applications

Abstract

Summary The output power requirement of battery charging circuits can vary in a wide range, hence making the use of conventional phase shift full bridge DC‐DC converters infeasible because of poor light load efficiency. In this paper, a new ZVS‐ZCS phase shift full bridge topology with secondary‐side active control has been presented for battery charging applications. The proposed circuit uses 2 extra switches in series with the secondary‐side rectifier diodes, operating with phase shift PWM. With the assistance of transformer's magnetizing inductance, the proposed converter maintains zero voltage switching (ZVS) of the primary‐side switches over the entire load range. The secondary‐side switches regulate the output voltage/current and perform zero current switching (ZCS) independent of the amount of load current. The proposed converter exhibits a significantly better light load efficiency as compared with the conventional phase shift full bridge DC‐DC converter. The performance of the proposed converter has been analyzed on a 1‐kW hardware prototype, and experimental results have been included.

A novel capacitor‐voltage reduced bidirectional PWM DC‐DC buck‐boost converter for renewable energy battery charge system

“…Isolated BDCs often use a high‐frequency transformer to support a high‐voltage conversion ratio 12 . These converters are half‐bridge or full‐bridge, and their gain depends on the transformer's turn ratio 13–18 . Transformer design becomes very difficult due to the leakage inductance losses at high voltages 19 .…”

“…12 These converters are half-bridge or full-bridge, and their gain depends on the transformer's turn ratio. [13][14][15][16][17][18] Transformer design becomes very difficult due to the leakage inductance losses at high voltages. 19 Generally, dual-active bridge converters are used in bidirectional applications.…”

Real time online efficiency optimization of buck converter against variable voltage and load change

“…Another way to reduce switching loss is to employ PWM soft switching technology, particularly the primary-side phase shifted (PPS) full-bridge (FB) DC-DC converter, which is extensively used. [12][13][14][15][16][17][18] It adopts the phase shift control approach to produce soft switching by leveraging the circuit's inherent resonance settings, reducing the switching loss to a minimum. It is extensively adopted in applications like vehicle chargers due to its continuous frequency-based duty cycle adjustment, but because it is challenging to produce ZVS at a light load, the converter's efficiency is significantly reduced in this situation.…”

“…However, these converters have significant voltage and current stresses in the switches and considerable circulating losses. Another way to reduce switching loss is to employ PWM soft switching technology, particularly the primary‐side phase shifted (PPS) full‐bridge (FB) DC‐DC converter, which is extensively used 12–18 . It adopts the phase shift control approach to produce soft switching by leveraging the circuit's inherent resonance settings, reducing the switching loss to a minimum.…”

Zero‐voltage switching half‐bridge pulse width modulation DC–DC converter with switched capacitor active snubber cell for renewable energy applications

“…Therefore, these converters are operated with soft switching (SS) snubber cells. In the literature, many SS converters that use zero‐voltage switching (ZVS) and zero‐current switching (ZCS) techniques are presented on increasing efficiency and power density 13–26 …”