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SP485R 数据资料DataSheet下载
SP485R 数据资料DataSheet下载

... The SP481R and SP485R are pin-to-pin equivalent with our existing SP485 product and contain enhancements such as higher ESD tolerance and high receiver input impedance. The higher receiver input impedance allows for connecting over 400 transceivers on a single transmission line without degrading the ...
PDF: 1.54MB
PDF: 1.54MB

Kelly KBS-X Brushless Motor Controller User`s Manual
Kelly KBS-X Brushless Motor Controller User`s Manual

... 15) Rugged aluminum housing for maximum heat dissipation and harsh environment. 16) Rugged high current terminals, and rugged aviation connectors for small signal. 17) Thermal protection: current cut back, warning and shutdown on high temperature. 18) Configurable 60 degree or 120 degree hall positi ...
\\Servernt\archivio\0060 KiloT\
\\Servernt\archivio\0060 KiloT\

... Before mounting, ensure that the operating voltage and mains voltage set are the same, and then proceed with installation. The instrument unit is double insulated and does not require an earth connection. The power supply must be connected to phase and neutral as shown in the relevant diagram. A 50 ...
Understanding Electronics Components
Understanding Electronics Components

... (power supply) voltage. Since battery voltage equals 6V, voltage in node C should be set to 3V. Adjustments are made via resistor R1. Connect a voltmeter between node C and gnd. If voltage exceeds 3V, replace the resistor R1=1.2MΩ with a smaller resistor, say R1=1MΩ. If voltage still exceeds 3V, kee ...
harmonics-shipboard-reportdraft1final
harmonics-shipboard-reportdraft1final

... realize that these two systems are different and shipboard applications require specific standards which take into account its electrical characteristics. The characteristics of shipboard power systems regarding harmonic distortion have been defined by both commercial and military standards Those st ...
FireForce 8 - Honeywell Power Products
FireForce 8 - Honeywell Power Products

Low Power Very High Frequency Switch-Mode Power
Low Power Very High Frequency Switch-Mode Power

... When designing power converters it is always a goal to reduce the price and the physical size, i.e. increase the power density. The development of Switch Mode Power Supplies (SMPS) has made it possible to increase the power density significantly, but it is limited by the size of the passive energy s ...
70-6910 2008- 2009 Tradeline Catalog
70-6910 2008- 2009 Tradeline Catalog

... Run Time Timing (Maximum (Maximum Voltage (sec)) (sec)) ...
SEL-451-Based Autosynchronizer Data Sheet
SEL-451-Based Autosynchronizer Data Sheet

... Three-Close Conditions. Close the controlled circuit breaker under three conditions with specific close acceptance criteria: autosynchronize close (phase angle is slipping), parallel close (zero slip conditions), and live generator/dead-bus close. Autosynchronize Acceptance Criteria. Initiate an aut ...
Atmel AVR042: AVR Hardware Design Considerations 8-bit Atmel
Atmel AVR042: AVR Hardware Design Considerations 8-bit Atmel

IDT5T9306 - Integrated Device Technology
IDT5T9306 - Integrated Device Technology

... Differential HSTL and eHSTL levels Differential LVEPECL (2.5V) and LVPECL (3.3V) levels Differential LVDS levels Differential CML levels 2. Because the gate controls are asynchronous, runt pulses are possible. It is the user's responsibility to either time the gate control signals to minimize the po ...
SKY13290-313LF 数据资料DataSheet下载
SKY13290-313LF 数据资料DataSheet下载

... Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other parameters set at or below their nominal value. ...
FAN6224 Synchronous Rectification Controller for Flyback and Forward Freewheeling Rectification
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... FAN6224 can be applied in Continuous or Discontinuous Conduction Mode (CCM and DCM) and Quasi-Resonant (QR) flyback converters based on a proprietary linear-predict timing-control technique. The benefits of this technique include a simple control method without current-sense circuitry to accomplish ...
AD7191 数据手册DataSheet下载
AD7191 数据手册DataSheet下载

... When the master clock for the device is provided externally by a crystal, the crystal is connected between MCLK1 and MCLK2. Serial Clock Input. This serial clock input is for controlling data transfers from the ADC. The SCLK has a Schmitt-triggered input, making the interface suitable for opto-isola ...
CHRISTU JYOTI INSTITUTE OF TECHNOLOGY & SCIENCE LABORATORY MANUAL ELECTRICAL MACHINES II
CHRISTU JYOTI INSTITUTE OF TECHNOLOGY & SCIENCE LABORATORY MANUAL ELECTRICAL MACHINES II

Analog Devices Welcomes Hittite Microwave Corporation www.analog.com www.hittite.com
Analog Devices Welcomes Hittite Microwave Corporation www.analog.com www.hittite.com

... Note: The parallel mode is enabled when P/S is set to low. Direct Parallel Mode - The attenuation state is changed by the control voltage inputs D0-D5 directly. The LE (Latch Enable) must be at a logic high at all times to control the attenuator in this manner. Latched Parallel Mode - The attenuatio ...
Paper Title (use style: paper title)
Paper Title (use style: paper title)

... parameter uncertainties and operating point changes. Ref used [18]. Usually, in order to keep closed loop control [11] shows that transients effect and output ripple voltage system working, PI and PID are most common control can be improved with using SMC for the two phase techniques are used. In th ...
Final Documentation 4914
Final Documentation 4914

... The process of the CALBOX begins with our user Moby, and the energy he creates when pedaling. The end result is that this energy charges a 12 volt battery, which then dissipates it to the Microsoft XBOX 360 to allow for game play. When Moby first began his experience with the CALBOX he was seeking a ...
Input Capacitor Selection Guide for MP2130 Application Note
Input Capacitor Selection Guide for MP2130 Application Note

... regulation. The MP2130 has a built-in soft-start that ramps up the output voltage at a controlled slew rate, avoiding overshoot at startup. When disabled, the MP2130 ramps down the internal reference thus linearly discharging the output. The soft-stop time is typically about 1ms. During soft-stop, t ...
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... situations where the persons are exposed as a consequence of their employment and in which those persons who are exposed have been made fully aware of the potential for exposure and can exercise control over their exposure. Occupational/controlled exposure also applies where the exposure is of trans ...
induction-motor-notes
induction-motor-notes

... which according to Lenz's law opposes the supply voltage. This induced e.m.f. is called back e.m.f. in case of synchronous motor. It is obtained as Ebph i.e. back e.m.f. per phase. This gets generated as the principle of alternator and hence alternating in nature and its magnitude can be calculated ...
347_accepted version - OPUS at UTS
347_accepted version - OPUS at UTS

... According to the suggestion of reference [4], the current ripple should be limited to less than 10%. According to [5], it is recommended that the 100/120 Hz ripple component be limited to within 15% of the total output and the 50/60 Hz ripple component be limited to within 10% from 10% to 100% loads ...
Welch Allyn Pediatric/Infant Scale Service Manual
Welch Allyn Pediatric/Infant Scale Service Manual

... The output signal from the load cells is applied to the protection network consisting of diodes CR4/CR5/CR6/CR7. These diodes prevent destructive high voltages caused by static discharges from damaging U4. A high frequency filter, formed by L1/L2/C9, C10 couples the weight signal to the input of U4. ...
10121017, 10121032, 10121064, 10121034
10121017, 10121032, 10121064, 10121034

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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.
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