Sine Amplitude Converters Provide Design Flexibility

March 2, 2016
By

Vicor devices such as the VTM and BCM use the Sine Amplitude Converter Topology (SAC) to provide isolation and voltage transformation functions, allowing you to place these functions where they are required, separating them from regulation.

The SAC also allows a flexible approach to design: devices based upon this topology can be used on their own, or connected in series or parallel to provide higher output currents or voltages.

Figure 1 - Connecting VTMs in Series and Parallel

Figure 1 – Connecting VTMs in Series and Parallel

 

Example Application

Consider the following example: a regulated 200 V rail is needed at the load from a 36 V to 75 V input voltage. To achieve this, four 50 V output voltage SAC modules (VTMs) M1, M2, M3 and M4 of the same K factor of 1 are used. Input and output voltage is equal for a K factor of 1. Output current IOUT is common to all SAC modules.

In this implementation, it is important to enable all SAC modules in a group to start all of them simultaneously for correct operation of resulting converter.

Total output voltage is the sum of output voltage given by all SACs connected in series output as given below for N number of SACs.

sac-in-series-equation

Where Total_VOUT = Total output voltage of series connect sine amplitude converters. N is the number of SAC modules. KN and VOUTN are the transformation factor and output voltage for each series connected SAC, VIN is the SAC input voltage which is equal to the output voltage of the regulator modules and VINS is the voltage of the unregulated input voltage source applied at the input terminals of the regulator.

The final system is shown below:

Figure 2- 50 V Input, 200 V Output Power Chain Using VTMs in Series

Figure 2- 50 V Input, 200 V Output Power Chain Using VTMs in Series

More Information

 

Tags: , , ,

One Response to:
Sine Amplitude Converters Provide Design Flexibility

  1. Stefan Danciu on March 10, 2016 at 1:59 PM

    I used SAC and other converters from Vicor Power and are very reliable. My application is on Photovoltaic System and the Vin is 16-48V with some difficults in the Output wich is not constant (It must adapt to some other Voltages in a range of +/- 2.5V and also to the seasons).
    To avoid borring I en now.
    Luck
    Stefan Danciu – stefan.danciu@gmail.com

Find out more about our Cool-Power Buck Regulators subscribe to vicor newsletter Contact Us

Get Connected