Category: EV charger

The operating principle of single phase-shift control for dual active bridge converter is explained. The switching sequence of DAB converter is divided into 10 intervals based on the Interval-1 (0 – t1) Interval-2 (t1 – t2) Interval-3 (t2 – t3) Interval-4 (t3 – t4) Interval-5 (t4 – t5) Interval-6 (t5 – t6) Interval-7 (t6 –…

In a single-phase, dual-active bridge shown in Fig., primary and secondary bridges are controlled simultaneously. All switches operate at 50% duty ratio. The diagonal switches turn-on and turn-off together so that the output of each bridge is a square wave. The switching sequence of the converter is elaborated in detail in this section. The typical…

Circuit Diagram The circuit diagram of single phase dual active bridge (DAB) resonant converter is shown in below Fig. This converter is useful in bidirectional power flow in battery charging and discharging applications. DAB consists of a full-bridge converters at input and output, resonant inductor, high-frequency transformer and load. High-frequency transformer provides galvanic isolation and…

Totem-pole PFC Circuit Analysis The analysis of totem-pole PFC circuit involves mainly derive and design of the following components. When positive input voltage and currents, D2 always conduct; Q1 and Q2 conduct alternatively When negative input voltage and currents, D1 always conduct; Q1 and Q2 conduct alternatively In a full cycle period, the area of…

Totem-pole PFC rectifier is widely used topology in single-phase applications for power factor correction. Circuit Description The totem-pole topologies are shown below. This topology replace the conventional diode bridge rectifier in boost PFC topology with an active high-frequency switches in one leg and low-frequency diodes in another leg. The diode leg can be further replace…

Variable frequency control, as name saying, this type of control keep on change the frequency for controlling the converter output voltage. Vo = Function (frequency) In this control, the PWM pulse frequency either increases or decreases to get the required output voltage after the design as per reference value given. Full-bridge Inverter: In general, normal…

The rectifier is used to convert the AC source to DC source. But in actual, it can produce pulsating DC that means waveform will have both AC and DC components. To get actual DC voltage, we need to use filters those reduce or eliminates the AC quantity and gives only DC quantity to the load.…

The ZVS analysis with its considerations and derivation of critical/boundary equations to operate circuit shown in PSFB circuit and operation modes are discussed in PSFB operation with turn-on loss-free converter are discussed below. In simple words, achieving ZVS means the MOSFET is turning-ON with zero voltage across it. This can happen when the internal output…

Hysteresis means lagging. The Hysteresis loop is used to understand the properties of the magentic core material. It is an important paremater in the selection of core material for various applications. We know, when placing the magnetic material inside the current carrying electrical circuit, EMF will be produced. In magnetic field, a magnetic bar is…

Diode is replaced by a power MOSFET in any converter, that particular MOSFET is called synchronous rectifier MOSFET Uses: Reduce the conduction losses —> Converter efficiency increaes Example: Let’s assume current flowing through the device is “20 A” when it is conducting. Diode MOSFET In general, diodes have the fixed forward voltage drop in range…