Rectification loss and inverter loss of energy storage

Can a synchronous rectifier reduce power loss?

Today it is well known that using a synchronous rectifier can reduce power loss and improve thermal capability. Designers of buck converters and controllers for step-down applications are already employing this technique. Synchronous boost controllers also have been developed to address power efficiency in step-up applications.

How much space does a synchronous rectifier save?

The latter is a space savings of 53 mm2. Both designs use the same LC filter and a 750-kHz switching frequency. Figure 3 shows the efficiency and power loss of both designs with a 12-V input and a 15-V output. The ideal duty cycle is 20%. The ben-efit of the synchronous rectifier is clear in this example.

What happens if PV power is higher than inverter power?

If the power from Solar PV is higher than the capacity of Inverter, some PV power is diverted to the battery in Buck mode of voltage controlled bidirectional DC-DC Converter. This avoids PV power clipping and loss of energy by inverter due to inverter capacity limitation.

Why is solar PV generation less than inverter capacity?

This avoids PV power clipping and loss of energy by inverter due to inverter capacity limitation. When Solar PV generation is less than Inverter capacity, power from the battery is discharged into the grid through same bidirectional DC-DC converter in Boost mode and Inverter. Model is simulated in MATLAB and results are validated.

Does duty cycle affect a resistive conduction loss?

A resistive conduction loss varies with current squared, leading to a dependence on duty cycle, with a higher duty cycle increasing the conduction power loss. To evaluate the power efficiency of low-duty-cycle applications, a synchronous design and a nonsynchronous design can be compared.

How does a synchronous rectifier work?

With a synchronous rectifier, there are two main sources of power dissipation—conduction and dead-time loss. When the low-side switch turns off, there is a time delay (tDELAY) before the high-side switch turns on. During this delay, the body diode (VSD) of the high-side switch con-ducts current. Typically this is referred to as dead time.