An Overview of the Sine Amplitude Converter

February 3, 2016

Using power components to architect power chains produces highly optimized solutions. One of the reasons for this is that each power component can use the best switching topology to perform the particular function required. Products with a regulated output voltage such as our Buck Regulators use ZVS topology, for example, while components that perform fixed ratio voltage transformation, such as the VTM and BCM, achieve better performance by using the Sine Amplitude Converter (SAC).

The SAC (see Fig. 1) uses a zero-current, zero-voltage soft switching technique which operates at a fixed switching frequency in excess of 1 MHz to provide low noise, high efficiency and power density, isolated and fixed ratio DC to DC conversion.

Simplified Sine Amplitude Converter (SAC) showing power train components

Figure 1 – Simplified Sine Amplitude Converter (SAC) showing power train components


The SAC output voltage is proportional to the input voltage applied at no load as given in the equation below:

SAC equation

Where K is a preset (fixed) value (e.g. 1, 2/3, 1/2, 1/3—– 1/48) and defined as a transformation factor or the turns ratio of SAC module. VIN = Input voltage applied to the SAC, VOUT = Output voltage produced by the SAC.

The SAC operates in a bidirectional power transfer mode, which provides step-down DC to DC conversion when operating in a forward direction from input to output terminals and step-up DC to DC conversion when operating in a reverse direction from output to input terminals and hence it provides the bidirectional power transfer across the isolation. When properly powered, SAC can operate down to zero volt, hence it provides the operation across a wide voltage range.

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