Voltage spike definition11/21/2023 ![]() ![]() Even smaller power surges can c ause damage if they happen frequently. When voltage increases above norma l capacity, it can cause an arc of electrical current, with associated heat also posing a risk to electronic components. The increase in current causes a back EMF (voltage) across the inductor due to Faraday's law of induction which opposes the change in current. The spike in voltage that causes power surges has the potential to damage electrical devices and appliances. When the switch is closed, the voltage from the battery is applied to the inductor, causing current from the battery's positive terminal to flow down through the inductor and resistor. The resistor represents the small residual resistance of the inductor's wire windings. This is usually a sub-cycle overvoltage lasting less than a half-cycle. 1 shows an inductor connected to a battery - a constant voltage source. A power surge is a transient wave of voltage, current or power in an electrical circuit. Operation Circuits illustrating the use of a flyback diodeįig. This diode is known by many other names, such as snubber diode, commutating diode, freewheeling diode, suppressor diode, clamp diode, or catch diode. The word flyback comes from the horizontal movement of the electron beam in a cathode ray tube, because the beam flew back to begin the next horizontal line. It is used in circuits in which inductive loads are controlled by switches, and in switching power supplies and inverters.įlyback circuits have been used since 1930 and were refined starting in 1950 for use in television receivers. The resistor R represents the resistance of the inductor's windingsĪ flyback diode is any diode connected across an inductor used to eliminate flyback, which is the sudden voltage spike seen across an inductive load when its supply current is suddenly reduced or interrupted. JSTOR ( October 2014) ( Learn how and when to remove this template message)ĭiagram of a simple circuit with an inductance L and a flyback diode D.Unsourced material may be challenged and removed. A voltage spike is a sudden increase in the voltage an electronic device receives, which lasts for around 1 nanosecond. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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