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Volatge Versatility with Power-Supply Magnetics
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From Signal Transformer
Some applications require unconventional voltages. While many designers of switched-mode power supplies (SMPS) associate the SHF series of off-the-shelf magnetic components from Signal Transformer with traditional voltages such as 5 and 15 V, some basic design strategies can be applied to generate a wide range of additional voltages. A few examples will show how this is possible. The first example employs a Signal Transformer model SHF 2015 transformer and a model SHFI 2015 inductor to provide as much as 6-A output current at 24 V (Fig. 1B, right). The current flow is limited by the current rating of the SHF 2015's secondary winding. The half-bridge converter circuit can handle DC line voltages of 200 to 400 V, or 100 to 200 V at the primary winding, and can provide efficiency approaching 100 percent for transformers with 24- and 30-turn primary windings. The efficient design incorporates a basic half-bridge circuit with voltage doubler to accommodate a wide range of input voltages (Fig. 1A, left). Product Announcements
Topics of Interest
Much of the current resonant converter development effort seems to be
for half-bridge topologies, which will now be considered. The following
discussion is based on a classic article by R.
(Read More)
7.2 Basic Transformer Model
The equivalent circuit of the basic transformer model, shown in Figure 7.1, consists of two mutually coupled coils. The voltages across these coils is expressed as:...
(Read More)
The DC/AC inverter topologies usually used in electronic ballasts are
the push-pull for 120-V AC line input and the half-bridge for 220-V line
input. Unlike switching power supplies which use...
(Read More)
This topology is shown in greater detail in Fig. 16.21. The T1 center
tap is fed directly from the low output impedance of the rectified
input line voltage or the output of the power factor...
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15.1 Winding Polarity
A transformer consists of two windings viz., primary and secondary coupled to a common magnetic core. International standards define the polarity of the primary and secondary...
(Read More)
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