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What is pulse width modulation (PWM)?
Pulse Width Modulation (PWM) is a way of digitally encoding analogue signal levels. Through the use of high-resolution counters, the duty cycle of a square wave is modulated to encode a specific analogue signal level. In more general terms, a switch is opened and closed in timed pulses, where the time the switch is closed is determines the power output.
Basically, a PWM variable-power scheme switches the power quickly between fully ON and fully OFF tens or hundreds of kHz in the case of a computer power supply (which has a regulated output). The switching rate is much faster than what would affect the load. 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.
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2011-09-29 POL chipset geared for high-performance apps
ZMDI's ZSPM1000 and ZSPM9000 enable smart power management solutions for area constraint applications.
2007-07-06 PoE controller supports any DC/DC converter topology
National Semiconductor Corp. has introduced a PoE powered device controller with adjustable output current level and the ability to interface with any DC/DC converter topology.
2006-03-22 PoE controller integrates power interface port
National Semiconductor introduced its single-chip power-over-Ethernet controller for higher-power PoE applications.
1999-12-01 PMW low pass filtering
Pulse width modulation (PWM) amplifiers often require low-pass filtering of the output to demodulate the PWM carrier. These filters can be as simple as a single inductor to multiple LC nodes depending on the application. In some motor and solenoid applications, the load can act as its own filter. Deciding on the type and size of a filter can be time consuming since the calculations can be tedious and often give component values that are not easily obtainable. This application note is an effort to reduce filter calculation time.
2000-02-08 PIC17C756A Market: Industrial Automation/Process Control
This application note describes the PIC17C756A as it handles the communication functions of a multi-node system with the RS-232 interface.
2013-12-02 Phase voltage reconstruction based on Qorivva MCUs
Know the Freescale Qorivva family features/approaches that can be used for motor control algorithms.
2004-04-01 Optical switch benefits from off-chip drive
As more electrostatic MEMS-based optical-switch products penetrate the market, scalability, reliability and tilt precision take on increased significance.
2014-09-29 Online monitoring of resistive power load (Part 2)
As we have already tackled the models and topologies for continuously monitoring the resistance of power load in Part 1, we will now look into interesting cases and examples.
2014-09-23 Online monitoring of resistive power load (Part 1)
This article series tackles the models and topologies for continuously monitoring the resistance of the power load without disturbing system's normal operation.
2002-07-23 ON Semi controller to drive next-gen Athlon processors
ON Semiconductor's NCP5331 multiphase controller will be combined with fast switching, power MOSFETs to provide a cost-effective power solution for AMD's upcoming Athlon processor based on X86-64 architectures.
2002-07-01 ON Semi buck converter delivers up to 91 percent efficiency
The NCP1500 dual-mode PWM buck converter from ON Semiconductor features a linear mode that the company claims reduces noise and quiescent current at low current levels, and a PWM mode that delivers up to 91 percent efficiency for heavy loads.
2005-07-11 O2Micro receives U.S. patent for inverter circuits
O2Micro Int. Ltd was granted 4 claims under U.S. patent number 6,897,698 for its phase shifting and pulse width modulation (PWM) driving circuits and methods
2007-02-26 O2Micro gets patent for inverter driving solution
Power management supplier O2Micro International Ltd received three claims under the U.S. patent number 7,151,394 for its phase shifting and PWM driving circuits and methods.
2015-06-09 Nothing left to be invented in embedded control (Part 3)
In Part 3, we explore a few more examples of core independent peripherals; combining their functionality with analogue peripherals to create new intelligent analogue solutions.
2015-05-25 Nothing left to be invented in embedded control (Part 2)
In this instalment, we learn that the power of the core independent peripherals is multiplied when we connect them together, relieving the CPU from potentially large computational loads and real-time constraints.
2015-05-21 Nothing left to be invented in embedded control (Part 1)
Thankfully, it is far from truth that there is nothing left to be invented in the realm of embedded control. This series looks into the various innovations occurring right now in front of our eyes.
2010-09-20 NHET getting started
This application note describes the basic steps necessary to generate a simple PWM with the next generation high-end timer (NHET) module.
2005-10-03 Next-gen cellphones cry for more power
Handset designers must consider several factors to effectively conserve power and extend battery life
2014-12-10 Next-gen 12V motor drivers boost system reliability
TI's DRV8846 automatically tunes motor performance for precise, smooth and quiet motion, while the DRV8848 eases designs by using a PWM control interface and minimal external components.
2007-03-01 National intros 'first' 6-100V current-mode buck controller
National Semiconductor said it has introduced the industry's first 6V to 100V current-mode buck controller for use in telecommunications, automotive and industrial control applications.
2014-02-21 Multirate techniques for digital power conversion
Discover how multi-rate techniques can support advances in digital power conversion.
2006-03-16 Multiplier circuit measures real power in high-frequency PWMs
Applications requiring the precise monitoring or regulation of dissipated load power can use a circuit that measures real power.
2002-06-16 Multi-output evaluation board for DVD SMPS
Know some basic techniques on how to design a power supply board in flyback converter topology with multiple-output voltage and secondary control used for DVD, VCD and VCR device apps.
2000-06-01 Multi-channel data acquisition system
The paper aims to establish a synergy for achieving a high level of analog performance, while keeping system complexity low. An 8-channel system provides several orders of magnitude of improvement over a single channel data acquisition system.
2007-01-04 Motor driver controls two DC motors at 2.4A
Allegro MicroSystems has announced a DMOS full-bridge PWM motor driver designed to control two DC motors at currents up to 2.4A.
2004-02-16 Motor control MCUs target appliances
Microchip Technology introduces the four-member PIC18Fxx31 family of 28-pin and 40/44-pin 8bit MCUs aimed at motor control applications.
2006-02-08 MOSFET designed for pre-bias supply circuitry
Zetex Semiconductors has introduced a high-voltage MOSFET to handle the requirements of pre-bias supply circuitry.
2013-07-09 Modular LED drivers minimises time-to-market
What are the dangers with bespoke devices and why are off-the-shelf LED drivers generally the better solution?
2007-07-11 Mobile I/O companion ICs target portable products
A mobile I/O companion family from National Semiconductor enables designers to easily expand system functionality in portable products such as personal digital assistants, media players, instrumentation, medical equipment and mobile handsets.
2002-04-30 Microchip Technology encoders provide KEELOQ security feature
The rfHCS362G and rfHCS362F wireless encoders from Microchip Technology integrate a built-in RF transmitter that feature the company's KEELOQ access control system.
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