specifications for centrifugal pump and fan applications
... prior approved equal. Substitutions must be submitted in writing three (3) weeks prior to original bid date with supporting documentation demonstrating that the alternative manufacturer meets all aspects of the specifications herein. B. Alternate control techniques other than pulse width modulated ( ...
... prior approved equal. Substitutions must be submitted in writing three (3) weeks prior to original bid date with supporting documentation demonstrating that the alternative manufacturer meets all aspects of the specifications herein. B. Alternate control techniques other than pulse width modulated ( ...
PLC CPM2A Data Sheet
... Two points with variable duty-ratio outputs using PWM(----). (Pulse outputs can be used with transistor outputs only, they cannot be used with relay outputs.) ...
... Two points with variable duty-ratio outputs using PWM(----). (Pulse outputs can be used with transistor outputs only, they cannot be used with relay outputs.) ...
Medium Voltage Switching Transient Induced Potential
... Some type of system disturbance is needed to “jolt” the transformer XL into a lower saturated value equal to the system capacitance XC. This “jolt” allows XL = XC and ferroresonance starts. Ferroresonance can continue for a long time (minutes, hours or even days) since little resistance (R) is in th ...
... Some type of system disturbance is needed to “jolt” the transformer XL into a lower saturated value equal to the system capacitance XC. This “jolt” allows XL = XC and ferroresonance starts. Ferroresonance can continue for a long time (minutes, hours or even days) since little resistance (R) is in th ...
S701 Soft Start Controllers and TL Torque Limiters for Intelligent
... Our S701 Soft Start Controllers and TL Torque Limiters provide solid-state reduced voltage control of three-phase and single-phase motors. These easy-to-install, compact devices are rated up to 25A, providing controlled acceleration and deceleration of fractional to 15HP/11kW motors at 480/400V AC. ...
... Our S701 Soft Start Controllers and TL Torque Limiters provide solid-state reduced voltage control of three-phase and single-phase motors. These easy-to-install, compact devices are rated up to 25A, providing controlled acceleration and deceleration of fractional to 15HP/11kW motors at 480/400V AC. ...
Evaluates: MAX8822 MAX8822 Evaluation Kit General Description Features
... and tested PCB that demonstrates the MAX8822 ultraefficient negative charge-pump LED driver with dual LDOs. The MAX8822 drives up to four white LEDs (WLEDs) for backlighting and contains two 200mA, high power-supply-rejection-ratio (PSRR) LDOs to power external camera modules or other loads. The EV ...
... and tested PCB that demonstrates the MAX8822 ultraefficient negative charge-pump LED driver with dual LDOs. The MAX8822 drives up to four white LEDs (WLEDs) for backlighting and contains two 200mA, high power-supply-rejection-ratio (PSRR) LDOs to power external camera modules or other loads. The EV ...
LTC2471/LTC2473 - Linear Technology
... conversion is finished, the converter automatically powers down (NAP) or under user control, both the converter and reference are powered down (SLEEP). The conversion result is held in a static register while the device is in this state. The cycle concludes with the DATA INPUT/OUTPUT state. Once all ...
... conversion is finished, the converter automatically powers down (NAP) or under user control, both the converter and reference are powered down (SLEEP). The conversion result is held in a static register while the device is in this state. The cycle concludes with the DATA INPUT/OUTPUT state. Once all ...
MC33811, Solenoid Monitor Integrated Circuit
... The 33811 device directly interfaces to a 3.3V or 5.0V micro controller unit (MCU) using 16 bit Serial Peripheral Interface (SPI) protocol. SPI serial clock frequencies up to 3.2MHz may be used when programming and reading output status information (production tested at 3.2MHz). Figure 5 illustrates ...
... The 33811 device directly interfaces to a 3.3V or 5.0V micro controller unit (MCU) using 16 bit Serial Peripheral Interface (SPI) protocol. SPI serial clock frequencies up to 3.2MHz may be used when programming and reading output status information (production tested at 3.2MHz). Figure 5 illustrates ...
Simulation of a Schematic Design
... By replacing component property parameters with variables, instead of specific values, it is possible to directly change the values from the simulator. Otherwise the schematic would have to be modified and saved before the new parameters are visible to the simulator. In the properties form (Edit > P ...
... By replacing component property parameters with variables, instead of specific values, it is possible to directly change the values from the simulator. Otherwise the schematic would have to be modified and saved before the new parameters are visible to the simulator. In the properties form (Edit > P ...
A Portable 2-Transistor Picowatt Temperature
... Abstract—Sensing systems such as biomedical implants, infrastructure monitoring systems, and military surveillance units are constrained to consume only picowatts to nanowatts in standby and active mode, respectively. This tight power budget places ultra-low power demands on all building blocks in t ...
... Abstract—Sensing systems such as biomedical implants, infrastructure monitoring systems, and military surveillance units are constrained to consume only picowatts to nanowatts in standby and active mode, respectively. This tight power budget places ultra-low power demands on all building blocks in t ...
Power Supplies
... All SDN units include built in current sharing for parallel and redundant operation. All models ending in P also include a DC OK status relay contact. The external modules SDN 2.5-20RED and SDN 30/40RED increase the reliability by isolating the supplies and adding more signal options. Paralleling fo ...
... All SDN units include built in current sharing for parallel and redundant operation. All models ending in P also include a DC OK status relay contact. The external modules SDN 2.5-20RED and SDN 30/40RED increase the reliability by isolating the supplies and adding more signal options. Paralleling fo ...
Application Note 2 Ozone Temperature Sense and 0-10V
... PCB Temperature near the LED solder joint, reducing the output current when a critical high temperature is reached. The Thermal protection described in this Application Note is simple and fast to implement; nevertheless if this protection is not possible or not necessary to be adopted, consider that ...
... PCB Temperature near the LED solder joint, reducing the output current when a critical high temperature is reached. The Thermal protection described in this Application Note is simple and fast to implement; nevertheless if this protection is not possible or not necessary to be adopted, consider that ...
MAX3228/MAX3229 +2.5V to +5.5V RS-232 Transceivers in UCSP General Description
... MAX3228/MAX3229 will automatically reduce the RS232 compliant levels (±5.5V) to RS-232 compatible levels (±4.0V) when VCC falls below approximately +3.1V. The reduced levels also reduce supply current requirements, extending battery life. Built-in hysteresis of approximately 400mV for VCC ensures th ...
... MAX3228/MAX3229 will automatically reduce the RS232 compliant levels (±5.5V) to RS-232 compatible levels (±4.0V) when VCC falls below approximately +3.1V. The reduced levels also reduce supply current requirements, extending battery life. Built-in hysteresis of approximately 400mV for VCC ensures th ...
LM2576/LM2576HV Series SIMPLE SWITCHER 3A Step
... LM2576 Series Buck Regulator Design Procedure ...
... LM2576 Series Buck Regulator Design Procedure ...
Reed Relays Capable of Switching Low Micro-Volts Signals
... metals. Fortunately some solids have the characteristic of being very good heat conductors while offering very good electrical isolation. Two of the most popular heat conducting insulators are listed in the above table: beryllia and alumina. As one can see the beryllia and alumina have better heat c ...
... metals. Fortunately some solids have the characteristic of being very good heat conductors while offering very good electrical isolation. Two of the most popular heat conducting insulators are listed in the above table: beryllia and alumina. As one can see the beryllia and alumina have better heat c ...
Training Manual
... products, entered the power systems market in the early 1900s. Its first power systems products included cast iron internal combustion engines and Automatic Power and Light, a remarkable improvement in auxiliary power in its day. Generators, then known as electrical plants, supplied power during Ad ...
... products, entered the power systems market in the early 1900s. Its first power systems products included cast iron internal combustion engines and Automatic Power and Light, a remarkable improvement in auxiliary power in its day. Generators, then known as electrical plants, supplied power during Ad ...
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.