Anti-Surge Resistor (RCR)
Resistors Glossary Terminology
Surges in electronic circuits are caused by internal conditions — switching operations from other
electronic components or due to external conditions on the AC power mains — switching operations
in the power grid or from nearby lightning strikes, either directly to the power distribution system or to
nearby ground. Electronic products have to be surge immune to ensure their continued reliable operation
if subjected to realistic levels of surge voltages, and they are required to comply with safety requirements.
Token’s RCR series is a perfect fit when an anti-surge resistor is required.
Light Dependent Resistor (LDR)
A photoresistor or light dependent resistor or cadmium sulfide (CdS) cell is a resistor whose resistance
decreases with increasing incident light intensity. It can also be referenced as a photoconductor.
A photoresistor is made of a high resistance semiconductor. If light falling on the device is of high enough
frequency, photons absorbed by the semiconductor give bound electrons enough energy to jump into the
conduction band. The resulting free electron (and its hole partner) conduct electricity, thereby lowering
resistance.
Carbon Composition Resistor (CCR)
CCR is made up of a solid rod of conductive composite material, the chemical composition of which is
altered to produce different resistance values. The general composition consists of the carbon conductor
and ceramic filler materials. By altering the ratio of filler to conductor it is possible to change the resistance
value. Interference-fit end caps are attached to the rods, leads are welded onto these caps, and the
resistor body is then protected with a specially formulated epoxy coating. The resistors are then colour
code marked.
Ayrton-Perry Winding
Winding of two wires in parallel but opposite directions to give better cancellation of magnetic fields than
is obtained with a single winding.
Wirewound technology has long been known as a leading technology for power resistor needs. The most
critical drawback with this technology is that it is inherently inductive. This is logical given that a
wirewound inductor and a wirewound resistor are made with essentially the same materials and processes.
This fact limits the use of wirewounds for applications with high switching speeds, which require low
inductance.
Now the same standard wirewounds can be used for these applications by using a non-inductively wound
version. This manufacturing method greatly reduces the inductance of any given resistor size and value
combination, however it does not completely eliminate the inductance. A non-inductively wound
wirewound has one winding in one direction and one in the other direction; known as Ayrton Perry
winding. This non-inductive winding is available in all Token standard wire-wound resistor series.
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