ballast resistor


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ballast resistor

[′bal·əst ri′sis·tər]
(electricity)
A resistor that increases in resistance as current through it increases, and decreases in resistance as current decreases. Also known as barretter (British usage).

Ballast resistor

A resistor that has the property of increasing in resistance as current flowing through it increases, and decreasing in resistance as current decreases. Therefore the ballast resistor tends to maintain a constant current flowing through it, despite variations in applied voltage or changes in the rest of the circuit.

The ballast action is obtained by using resistive material that increases in resistance as temperature increases. Any increase in current then causes an increase in temperature, which results in an increase in resistance and reduces the current. Ballast resistors may be wire-wound resistors. Other types, also called ballast tubes, are usually mounted in an evacuated envelope to reduce heat radiation.

Ballast resistors have been used to compensate for variations in line voltage, as in some automotive ignition systems, or to compensate for negative volt-ampere characteristics of other devices, such as fluorescent lamps and other vapor lamps.

References in periodicals archive ?
The original design[3] was modified to accommodate HBTs with ballast resistors, and performance was improved slightly.
Thankfully, if cost is of more concern than perfect matching, an inexpensive low-dropout (LDO) linear regulator can provide enough of a benefit to avoid tweaking the ballast resistor value with each new batch of LEDs.
Several design and production enhancements contribute to the success of the TGH29 line including an HBT unit cell that incorporates integrated emitter ballast resistors to minimize thermal runaway.
It is appropriate for driving LEDs in parallel, using ballast resistors to set the current, in LCD backlighting and color indicator applications.