Electronic transformers may be used to supply power, transmit signals, establish voltage isolation between circuits, sense voltage and current levels, modify voltage and current levels, provide impedance matching, and filtering.
Power Transformers
        Power transformers are essentially alternating current devices. They cannot sustain transformer operation from a fixed direct current voltage source. However they can sustain transformer operation in transient conditions that allow resetting or reversal of the transformer’s magnetic flux levels.
Switch Mode Power Transformers
        Switch mode power transformers and power supplies get their name from the switching action needed to sustain transformer operation. By controlling the amount of “on time” and “off time” of the switches, one can also control the amount of power delivered to the transformer’s load/load circuit. The voltage can be fed to the switch mode power transformer in voltage pulses.
        Switch mode power is also referred to as DC to DC conversion. The DC power has to be switched on and off by a high speed switch (usually a Transistor or Integrated Circuit) and converted into AC power before it can be changed/transferred by a transformer. This generally occurs anywhere from 20,000-1,000,000/sec (Hz)
        At Rayco, we have several types of transformers to fit your needs, we could provide you with the following:
• Current
• High Voltage
• Instrument
• Inverting
• Impedence Matching
• Power
• Pulse
• Switching/switch mode
• Signal
• Step-up/Step-down
• Saturable
• Etc…

Transformer-based configurations are:
– Forward Converter—Extremely popular
– Push-Pull—The most size-efficient
– Current/Voltage Sense Transformers
Toroidal Transformers
        Among transformers, toroidal transformers are the high performers. They offer the smallest size (by volume and weight), less leakage inductance, and lower electromagnetic interference (EMI). Their windings cool better because of the proportionally larger surface area. A 360 degree wound toroidal transformer has a high degree of symmetry. Its geometry leads to near complete magnetic field cancellation outside of its coil, hence the toroidal transformer has less leakage inductance and less EMI when compared against other transformers of equal power ratings.

Why are toroidal-based magnetics used in power applications (Very Low EMI, Chokes, Filters, Suppressions, etc)?

• Give the highest inductance for a given volume
• Space Efficient
• Add on product to provide one stop shopping
• Inductance Range: 1uH-1H
Tape Wound Toroidal Transformers
.        Originally, tape wound core toroids were developed to replace vacuum tubes. Vacuum tubes were fragile and required frequent replacement. The tape wound core toroidal transformers were more reliable. Tape wound core toroidal transformers are made by wrapping thin long strips of magnetic material around a winding mandrel.
Bobbin Wound Transformers
        Bobbin wound electronic transformers are made from a variety of materials: Teflon, glass, phenolic plastics, etc. (most are molded and some are fabricated). They are used in a variety of applications. Bobbin designs for bobbin wound transformers often provide terminals, pins, and/or surface mount pads to ease wire termination and to facilitate printed circuit board mounting.
Surface Mount Transformers
        This type of transformer refers to a type of construction that permits attachment of surface mount transformers to a printed circuit board.
Engineers have developed solder pastes, adhesives, and assembly processes that permit attaching transformer terminals to PCBs without using holes. Flat areas known as pads on the transformer terminals are soldered directly to copper circuitry surfaces, hence, the term surface mount transformer. This process eliminates the need to drill holes for the pins, thereby, reducing the cost to manufacture a PCB.

-Miniature 400Hz
-Audio
-Low Profile Audio
-Switch Mode
-Current Sense
-60Hz Low Profile
-60Hz High Isolation
-Subminiature Pulse