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MAX17598/MAX17599 Low I , Wide-Input Range, Active Clamp Current-Mode PWM Controllers
MAX17598/MAX17599 Low I , Wide-Input Range, Active Clamp Current-Mode PWM Controllers

EMS1EP Lecture 8 – Pulse Width Modulation (PWM)
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... • If button on Pin 5 is pressed servo to go to 30O • If button is not pressed servo to go to 120O • Servo connected to Pin 9 ...
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... Supply voltages below the specified levels can cause the REF32xx to momentarily draw currents greater than the typical quiescent current. This momentary current draw can be prevented by using a power supply with a fast rising edge and low output impedance. For optimal startup when the IN pin and ENA ...
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... everyday items such as mobile phone chargers, radios and laptop computers. Inside a transformer A transformer consists of two coils of wire, wound around an iron core. The AC input passes through the primary coil, and the AC output passes through the secondary coil. Note that the two coils are not i ...
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... generator, the turbine rotor speed can only be operated between 0.67 p.u.-1.33p.u. [6] and the design constrains, such as the maximum power output, limit the frequency response capability of the DFIGs. In particular, when rotor speed control is applied to ‘deload’ [7] the WECS and reserve part of th ...
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... value of 1. The first term tells us what portion of the total energy consumed by the overall system gets radiated as RF signal energy in the transmitter. The second term describes how much the link margin is degraded due to noise added by the receiver. The third term quantifies the non-ideality of t ...
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... A problem caused by the large energy storage capacitor: the large inrush current observed during system startup, necessary to charge the capacitor to its equilibrium value. Boost converter is not capable of controlling this inrush current. Even with d = 0, a large current flows through the boost con ...
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... device. A 2.7 V to 5.5 V power supply is required on the VCC pin to power the device. Four precision comparators monitor four voltage rails. Each comparator has a 0.6 V reference with a worst-case accuracy of 0.8%. Resistor networks that are external to the VIN1, VIN2, VIN3, and VIN4 pins set the tr ...
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... 5.8.1 C/B The C/B input provides feedback from the generator circuit breaker and is used by the C6200 module to determine if the breaker is open or closed. C/B is typically connected to COM through an auxiliary contact of the breaker. The breaker is considered closed by the C6200 module when the C/B ...
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... required [12]. The design of the rectifying unit is often made with respect to the application it is going to be used in. Normal power diodes have an on-state forward voltage drop of about 0.7-1 V depending on the design [12]. The Schottky diode has a significantly lower on-state voltage drop, aroun ...
International Electrical Engineering Journal (IEEJ) Vol. 5(2014) No.12, pp. 1696-1702
International Electrical Engineering Journal (IEEJ) Vol. 5(2014) No.12, pp. 1696-1702

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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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