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2. Variable-frequency drive - Wikipedia

   en.wikipedia.org/wiki/Variable-frequency_drive

   The vast majority of drives are VSI type with PWM voltage output. [d] Current-source inverter (CSI) drive topologies (see image): In a CSI drive, the DC output of the SCR-bridge converter stores energy in series-Inductor connection to supply stiff current input to the inverter. CSI drives can be operated with either PWM or six-step waveform output.

3. Vector control (motor) - Wikipedia

   en.wikipedia.org/wiki/Vector_control_(motor)

   In vector control, an AC induction or synchronous motor is controlled under all operating conditions like a separately excited DC motor. [21] That is, the AC motor behaves like a DC motor in which the field flux linkage and armature flux linkage created by the respective field and armature (or torque component) currents are orthogonally aligned such that, when torque is controlled, the field ...

4. Motor drive - Wikipedia

   en.wikipedia.org/wiki/Motor_drive

   Line regenerative variable frequency drives, showing capacitors (top cylinders) and inductors attached which filter the regenerated power. A motor drive is a physical system that includes a motor. An adjustable speed motor drive is a system that includes a motor that has multiple operating speeds.

5. Direct torque control - Wikipedia

   en.wikipedia.org/wiki/Direct_torque_control

   Thus it is not possible to control the motor if the output frequency of the variable frequency drive is zero. However, by careful design of the control system it is possible to have the minimum frequency in the range 0.5 Hz to 1 Hz that is enough to make possible to start an induction motor with full torque from a standstill situation. A ...

6. Glossary of power electronics - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_power_electronics

   For AC conversion, the ratio of the fundamental output power to the fundamental input power. AC converter A converter for AC conversion. AC filter A filter on the AC side of a converter, designed to reduce the circulation of harmonic currents in the associated system. AC voltage converter An AC converter for changing the voltage.

7. Chopper (electronics) - Wikipedia

   en.wikipedia.org/wiki/Chopper_(electronics)

   Variable frequency, variable pulse width; CLC control; In pulse-width modulation the switches are turned on at a constant chopping frequency. The total time period of one cycle of output waveform is constant. The average output voltage is directly proportional to the ON time of chopper. The ratio of ON time to total time is defined as duty cycle.

8. Vacuum fluorescent display - Wikipedia

   en.wikipedia.org/wiki/Vacuum_fluorescent_display

   A VFD operates on the principle of cathodoluminescence, roughly similar to a cathode-ray tube, but operating at much lower voltages. Each tube in a VFD has a phosphor-coated carbon anode that is bombarded by electrons emitted from the cathode filament. [1] [2] In fact, each tube in a VFD is a triode vacuum tube because it also has a mesh ...

9. AC-to-AC converter - Wikipedia

   en.wikipedia.org/wiki/AC-to-AC_converter

   An AC-AC converter with approximately sinusoidal input currents and bidirectional power flow can be realized by coupling a pulse-width modulation (PWM) rectifier and a PWM inverter to the DC-link. The DC-link quantity is then impressed by an energy storage element that is common to both stages, which is a capacitor C for the voltage DC-link or ...