Limiter

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limiter

[′lim·əd·ər]
(electronics)
An electronic circuit used to prevent the amplitude of an electronic waveform from exceeding a specified level while preserving the shape of the waveform at amplitudes less than the specified level. Also known as amplitude limiter; amplitude-limiting circuit; automatic peak limiter; clipper; clipping circuit; limiter circuit; peak limiter.

Limiter

 

(in electronic engineering), a device that provides a constant output voltage level when the value of the input voltage exceeds a limiting threshold. Limiters are used extensively in pulse technology to shape and transform pulses and in radio broadcasting and multichannel communication apparatus to limit signal levels. Amplitude limiters provide a specified maximum level for the amplitudes of the fundamental oscillation (first harmonic); limiters of instantaneous values “clip off” any overshoots of oscillations.

The operation of a limiter depends on abrupt change in the conductivity of a nonlinear component (transistor, semiconductor

Figure 1. Circuit of a limiter and curves explaining its operation: (A) operating characteristic of the limiter; (B) curve of the input voltage Uin; (C) curve of the output voltage Uout; (Uu1) and (U11) voltages of sources of emf in the diode circuits that determine the lower and upper limiting thresholds, respectively; (U1) and (Uu) lower and upper levels of the limited voltage; (Uinst) instantaneous value of the oscillation amplitudes; (ab) linear portion of the limiter characteristic; (R) limiting resistor; (RL) load (output) resistor; (D1) and (D2) semiconductor diodes

diode, electron tube, and so on) when the amplitude or instantaneous value of the input voltage reaches the limiting threshold; because of this, a futher increase in the amplitude or instantaneous value of the output voltage is stopped (see Figure 1). A distinction is made between limiters with unilateral operation (with only an upper or lower limiting threshold) and clipper-limiters.

V. M. TIMOFEEV

limiter

A special-purpose fuse (usually of high current-interrupting rating) designed to protect an electrical circuit or equipment from the effects of high available short-circuit current by limiting the amount of current permitted to flow through it.
References in periodicals archive ?
The automaker is launching the speed limiter to enhance its safety credentials and meet a pledge to eliminate passenger fatalities by 2020.
It requires closed vans, haulers or cargo trailers, public utility vehicles (PUVs), shuttle service vehicles, and tanker trucks, to install DOTr-approved speed limiters before being able to ply roads.
"It's a context-sensitive speed limiter; a completely new concept for the Middle East," he explained.
The UAE Ministry of Interior (MoI) had issued a notice for mandating speed limiters for private passenger buses that hold a capacity of 22 passengers in line with a recommendation it received to that effect from the Emirates Authority for Standardisation & Metrology (ESMA).
The report further confirmed that Guinness World Records have found that 'a change to the speed limiter will not alter the fundamental design of the car or its engine.'
"Guinness knew the Veyron's speed limiter was deactivated but that for safety reasons, cars subsequently sold to customers would have their speed limiters activated [set at 258mph]," a spokeswoman for Bugatti told TopSpeed.com.
Featuring a speed limiter raised to 174mph (280km/h), the 510PS XFR Speed Pack car is equipped with revised engine and gearbox calibration to match the increased top speed.
Based on the mid-range Acenta model, the ELLE's standard kit includes automatic air-con, keyless entry and push button start, electrically heated and folding door mirrors, along with a speed limiter and cruise control.
His truck, he said, does not have a speed limiter on it, but he said he doesn't drive faster than 64 mph.
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