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A frequency-to-current converter are electronic devices, used to convert a frequency (an AC signal) into an output current whose value is a function of the input frequency. In simple words, frequency- to-current converters are used to convert power from one level to another.
Structure
Generally electromechanical components like motors and generators are used to construct frequency-to-current converters. Usually, a frequency to current converters comprises of transformer, rectifier or diode, & thyristors.
Working
Initially, the rectifier or diode of a frequency-to-current converter converts incoming alternating current (AC) to direct current (DC). Subsequently, devices like thyristors (which are used for switching applications, including converters, power supplies, and motor control devices) invert the direct current.
Besides current conversion, a frequency to current converters may be used to convert frequency to voltage. In order to convert the voltage of an incoming signal, the frequency-to-current converter makes use of a transformer that capable of providing galvanic isolation required between the input signal and the output signal.
Applications
Applications of frequency-to-current converters are as follows:
- To control of speed and torque of AC current-driven motors
- To control a motor using a three-phase voltage inverter where semiconductor switches and pulse width modulation devices controls the phases
- To monitor the speed of heavy equipment like turbines or flow meters, or machinery used in hazardous environments, such as the underground pulley systems and conveyors used in transportation and mining.
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