voltage regulator

noun Electricity.
a device that controls or maintains the voltage of an electrical circuit. Abbreviation: VR

Origin:
1910–15

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
Encyclopedia

voltage regulator

any electrical or electronic device that maintains the voltage of a power source within acceptable limits. The voltage regulator is needed to keep voltages within the prescribed range that can be tolerated by the electrical equipment using that voltage. Such a device is widely used in motor vehicles of all types to match the output voltage of the generator to the electrical load and to the charging requirements of the battery. Voltage regulators also are used in electronic equipment in which excessive variations in voltage would be detrimental.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
We design in this paper a global controller to coordinate the transient
  stabilizer and voltage regulator.
The failure to perform an adequate test contributed to an automatic reactor
  shutdown when the automatic voltage regulator tripped.
Level one is required but without the requirement of the voltage regulator
  controls.
The electronic circuitry, designed with high-reliability components, consists
  of a voltage regulator and a power rectifier.
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