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Viking Pump Flow Manager
Viking Pump Flow Manager

JN3616501653
JN3616501653

... design a filter that passes current only at line frequency (e.g. 50 or 60 Hz). This filter reduces the harmonic current, which means that the non-linear device now looks like a linear load. At this point the power factor can be brought to near unity, using capacitors or inductors as required. This f ...
Q-Astec - First transient power converter using switched
Q-Astec - First transient power converter using switched

... ƒ Transient can be supported in the time that it takes to turn the FET On/Off ƒ When output current follows processor demand current, significant reduction in output capacitance can be observed ƒ The constant current source is derived from a Buck Converter driving a matrix Transformer configuration ...
Custom Remote Annunciator
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STK401-120 AF Power Amplifier (Split Power Supply) (80W+80W
STK401-120 AF Power Amplifier (Split Power Supply) (80W+80W

... Input coupling capacitors. For DC blocking. Since capacitor reactance becomes larger at lower frequencies, the output noise can be adversely affected by signal source resistance-dependent 1/f noise. In this case, a lower reactance value should be chosen. In order to remove pop noise at power-on, lar ...
FE3110411050
FE3110411050

... using semiconductor switches are commonly classified into indirect converter which utilizes a DC link between the two AC systems and direct converter that provides direct conversion. Indirect converter consists of two converter stages and energy storage element, which convert input AC to DC and then ...
ST13003N
ST13003N

... High voltage fast-switching NPN power transistor Features ...
Modelling of Nonlinear Loads and Estimation of Harmonics
Modelling of Nonlinear Loads and Estimation of Harmonics

... voltage in case of VSI and PWM topologies. The harmonics injected by the inverter is mainly dependent on the inverter topology and the motor characteristics. Therefore, the ASD can be modeled with a common three phase bridge converter circuit together with a DC link circuit and a harmonic current so ...
Circuits Simulation
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LA4555 - Bucek.name
LA4555 - Bucek.name

... products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, an ...
2N3055 MJ2955
2N3055 MJ2955

... Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any ...
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... If POWER comes out  torque goes in and this is an AC generator If POWER is supplied  torque comes out and this is an AC motor ...
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Power Supply - IT Essentials

... • The number of connectors that come with a system may vary. • There is a specific smaller floppy drive connector. • Multiple larger four pin connectors may be used on hard drives, CD-ROMS, and DVD. • A Y-Connector may add flexibility to drive connectors but is not recommended. ...
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DN351 - Versatile Micropower Voltage Reference Provides Resistor Programmable Output from 0.4V to 18V
DN351 - Versatile Micropower Voltage Reference Provides Resistor Programmable Output from 0.4V to 18V

... allows the ADC to accurately capture the “zero input” signal level, or even provide a controlled negative signal conversion range within a positive-only input window. Figure 3 shows a single supply powered LT1990 difference amp sensing a bidirectional motor current. The LT6650 reference is configure ...
Analog Meters Clamping to DIN Rails
Analog Meters Clamping to DIN Rails

... the measurement of current, voltage & frequency in distribution, installations which utilizes 35 mm.DIN rails for equipment mounting. The mounting width is 45 mm. These meters housed in molded Polycarbonate cases are suitable for the measurement of AC current & voltage, DC current & voltage & Freque ...
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Hardware Design Considerations for an Efficient
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... particles from a given surface. Vacuum cleaners are used in homes as well as in industries and come with a variety of power levels, small battery-operated hand-held devices, domestic central vacuum cleaners and huge stationary industrial appliances. A universal motor is typically used as suction mot ...
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hH Schottky Diode Voltage Doubler Application Note 956-4

... Measured performance of the voltage doubler at 2 GHz compared to a single diode is shown in Figure 2. A triple stub tuner was used to match the detectors at each input level. Figure 3 shows similar data with the tuner adjusted at -30 dBm and fixed at that position. The ...
2SD2671
2SD2671

... No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Up ...
002909 Electronics 1. A modulation technique that uses two tones
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... Note:- The circuit is operating normally because these are precisely the checks. a) – The base of Q1 should be 0.7 volts higher than the output voltage. Since the output voltage is 25 Volts, Naturally base of Q1 is at 25.7 Volts. By implication, collector of Q2 is at same voltage, rather it is the o ...
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Eletronica de Potencia V18 - N4.indd
Eletronica de Potencia V18 - N4.indd

EB25778783
EB25778783

... ABSTRACT This paper presents a new Unified PowerQuality Conditioning System (MCUPQC),capable of simultaneous compensation for voltage and current in multi-bus/multi-feeder systems. By using one shunt Voltage-Source Converter(VSC) and two or more series VSCs the configuration is made. The system can ...
SICAM-Q200
SICAM-Q200

... Harmonics of voltages, currents, and powers up to the 63rd order according to the IEC 61000-4-7 standard. The following values are given for each harmonic: • RMS value (for power: RMS value and sign) • Phase angle The sign of the active power of the single harmonic can indicate the direction of the ...
< 1 ... 1008 1009 1010 1011 1012 1013 1014 1015 1016 ... 1315 >

Variable-frequency drive



A variable-frequency drive (VFD) (also termed adjustable-frequency drive, variable-speed drive, AC drive, micro drive or inverter drive) is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage.VFDs are used in applications ranging from small appliances to the largest of mine mill drives and compressors. However, around 25% of the world's electrical energy is consumed by electric motors in industrial applications, which are especially conducive for energy savings using VFDs in centrifugal load service, and VFDs' global market penetration for all applications is still relatively small. That lack of penetration highlights significant energy efficiency improvement opportunities for retrofitted and new VFD installations.Over the last four decades, power electronics technology has reduced VFD cost and size and has improved performance through advances in semiconductor switching devices, drive topologies, simulation and control techniques, and control hardware and software.VFDs are available in a number of different low- and medium-voltage AC-AC and DC-AC topologies.
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