International Electrical Engineering Journal (IEEJ) Vol. 5 (2014) No.7, pp. 1484-1489
... varying analog signals; this PWM conversion generally has a very high electrical efficiency [3]. In controlling either a three phase synchronous motor or a three phase induction motor it is desirable to receive a perfectly sinusoidal current waveform in motor windings, with relative phase displaceme ...
... varying analog signals; this PWM conversion generally has a very high electrical efficiency [3]. In controlling either a three phase synchronous motor or a three phase induction motor it is desirable to receive a perfectly sinusoidal current waveform in motor windings, with relative phase displaceme ...
Multifrequency bio-impedance measurement: undersampling
... of the according analog conversion (modulation/ demodulation) circuits, and micro-controller [2], or can be realized as analog and digital mixed-signal ASIC [3]. ...
... of the according analog conversion (modulation/ demodulation) circuits, and micro-controller [2], or can be realized as analog and digital mixed-signal ASIC [3]. ...
PGA26E07BA Product Overview - Panasonic Industrial Devices
... with single GaN device by Panasonic’s proprietary GIT: Gate Injection Transistor technology. – Extremely high-speed switching characteristics. – Current Collapse Free 600V and more. – Zero recovery loss characteristics. ...
... with single GaN device by Panasonic’s proprietary GIT: Gate Injection Transistor technology. – Extremely high-speed switching characteristics. – Current Collapse Free 600V and more. – Zero recovery loss characteristics. ...
ppt - MakeItOrTakeIt
... inside the delta loop of a delta connected motor, controlling the voltage applied to each winding. ...
... inside the delta loop of a delta connected motor, controlling the voltage applied to each winding. ...
dv/dt MOTOR PROTECTION OUTPUT FILTER Limits
... causing voltage pulses to be reflected back in the direction from ...
... causing voltage pulses to be reflected back in the direction from ...
LM2623 Ratio Adaptive, Gated Oscillator Cookbook
... from the battery. Small current fluctuations change the voltage across R2 and increase or decrease the oscillator drive to compensate. This maintains the balance. The IC’s change in frequency with temperature is very well matched to the change in LED voltage with temperature. This also helps to main ...
... from the battery. Small current fluctuations change the voltage across R2 and increase or decrease the oscillator drive to compensate. This maintains the balance. The IC’s change in frequency with temperature is very well matched to the change in LED voltage with temperature. This also helps to main ...
Critical Design Review
... ● The size of the buffer and the amount of maximum delay are the two main parameters ● The guitar input and the delayed value are both down sampled then upsampled when returned to main ...
... ● The size of the buffer and the amount of maximum delay are the two main parameters ● The guitar input and the delayed value are both down sampled then upsampled when returned to main ...
Nature of Control Actions in a Power System Operating states and
... operates with good quality and security. The major components of a load dispatch centre are: a) Engineers for carrying out scheduling and monitoring b) Software programs to carry out monitoring and scheduling functions ...
... operates with good quality and security. The major components of a load dispatch centre are: a) Engineers for carrying out scheduling and monitoring b) Software programs to carry out monitoring and scheduling functions ...
SPF-500 SPF-750 SPF-1000
... Featuring: • Forced current sharing for N +1 redundancy • Universal AC input • 0.99 typical power factor • Low ripple and noise • DC power good and AC power fail signals • True remote inhibit • Monotonic turn-on and turn-off When you need a single-output power supply, but want all the proven industr ...
... Featuring: • Forced current sharing for N +1 redundancy • Universal AC input • 0.99 typical power factor • Low ripple and noise • DC power good and AC power fail signals • True remote inhibit • Monotonic turn-on and turn-off When you need a single-output power supply, but want all the proven industr ...
AVC63-12 and AVC125-10 Voltage Regulators
... products are ideally suited for controlling the output of brushless excited synchronous generators up to 5MW. These devices offer higher powered output and accept a variety of accessory items for new and retrofit applications where high performance and reliability are mandatory. These devices utiliz ...
... products are ideally suited for controlling the output of brushless excited synchronous generators up to 5MW. These devices offer higher powered output and accept a variety of accessory items for new and retrofit applications where high performance and reliability are mandatory. These devices utiliz ...
DN316 - Ultralow Noise Switching Power Supplies Simplify EMI Compliance
... coupled across to the secondary winding. These high frequency harmonics on the secondary winding are difficult to suppress. Even with an output filter inductor, the high frequency harmonics pass through the filter inductor to the output via the inductor’s parasitic capacitance. The best solution fo ...
... coupled across to the secondary winding. These high frequency harmonics on the secondary winding are difficult to suppress. Even with an output filter inductor, the high frequency harmonics pass through the filter inductor to the output via the inductor’s parasitic capacitance. The best solution fo ...
Designing Efficient Fans for Electronics Cooling Applications
... In modern day equipment racks, the power consumed by the cooling fans represents a significant percentage of the overall system power budget. With the advent of data centers and their large energy costs, the issue of "cooling power" is exacerbated. It is, therefore, becoming crucial to design and im ...
... In modern day equipment racks, the power consumed by the cooling fans represents a significant percentage of the overall system power budget. With the advent of data centers and their large energy costs, the issue of "cooling power" is exacerbated. It is, therefore, becoming crucial to design and im ...
AD45048: Rail-to-Rail Upstream ADSL Line Driver Data Sheet
... have a crest factor (V peak/V rms ratio) as high as 5.3, requiring the line driver to provide a peak power of 560 mW. The line driver is required to drive a 7.5 V peak onto the 100 Ω telephone line while maintaining about −65 dBc to −70 dBc of MTPR. Since the maximum low distortion output swing avai ...
... have a crest factor (V peak/V rms ratio) as high as 5.3, requiring the line driver to provide a peak power of 560 mW. The line driver is required to drive a 7.5 V peak onto the 100 Ω telephone line while maintaining about −65 dBc to −70 dBc of MTPR. Since the maximum low distortion output swing avai ...
Low cost sinusoidal control of BLDC motors with Hall sensors using
... Experimental implementation using ST7FMC The power of ST7MC to control BLDC motors with trapezoidal flux distribution, in 6 step mode, is well known. In addition to this, ST7MC is also capable of delivering three phase sinusoidal complementary PWMs with programmable dead time insertion to control a ...
... Experimental implementation using ST7FMC The power of ST7MC to control BLDC motors with trapezoidal flux distribution, in 6 step mode, is well known. In addition to this, ST7MC is also capable of delivering three phase sinusoidal complementary PWMs with programmable dead time insertion to control a ...
Optimized Pulse Patterns for the 5-Level ANPC
... switching pulses can be generated during one fundamental period, which results in a switching frequency to fundamental frequency ratio of 3-4. Therefore, PWM cannot provide acceptable results. The final goal is to run the introduced system with a current THD of less than 5% without the use of an add ...
... switching pulses can be generated during one fundamental period, which results in a switching frequency to fundamental frequency ratio of 3-4. Therefore, PWM cannot provide acceptable results. The final goal is to run the introduced system with a current THD of less than 5% without the use of an add ...
Document
... and explained through an average behavioral model and state-plane analysis. The operation of the controller is experimentally verified on a 12W 12V-to-1.5V converter, demonstrating voltage-mode control operation as well as time-optimal response for load transients. Existing system: In recent years ...
... and explained through an average behavioral model and state-plane analysis. The operation of the controller is experimentally verified on a 12W 12V-to-1.5V converter, demonstrating voltage-mode control operation as well as time-optimal response for load transients. Existing system: In recent years ...
Pulse-width modulation
Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a modulation technique used to encode a message into a pulsing signal. Although this modulation technique can be used to encode information for transmission, its main use is to allow the control of the power supplied to electrical devices, especially to inertial loads such as motors. In addition, PWM is one of the two principal algorithms used in photovoltaic solar battery chargers, the other being MPPT.The average value of voltage (and current) fed to the load is controlled by turning the switch between supply and load on and off at a fast rate. The longer the switch is on compared to the off periods, the higher the total power supplied to the load.The PWM switching frequency has to be much higher than what would affect the load (the device that uses the power), which is to say that the resultant waveform perceived by the load must be as smooth as possible. Typically switching has to be done several times a minute in an electric stove, 120 Hz in a lamp dimmer, from few kilohertz (kHz) to tens of kHz for a motor drive and well into the tens or hundreds of kHz in audio amplifiers and computer power supplies.The term duty cycle describes the proportion of 'on' time to the regular interval or 'period' of time; a low duty cycle corresponds to low power, because the power is off for most of the time. Duty cycle is expressed in percent, 100% being fully on.The main advantage of PWM is that power loss in the switching devices is very low. When a switch is off there is practically no current, and when it is on and power is being transferred to the load, there is almost no voltage drop across the switch. Power loss, being the product of voltage and current, is thus in both cases close to zero. PWM also works well with digital controls, which, because of their on/off nature, can easily set the needed duty cycle.PWM has also been used in certain communication systems where its duty cycle has been used to convey information over a communications channel.