Difference between revisions of "Switching regulator"
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The [[MCP1252/3]] Flyback Switching Regulators can generate an output voltage greater than the input voltage -- something impossible with linear voltage regulators. | The [[MCP1252/3]] Flyback Switching Regulators can generate an output voltage greater than the input voltage -- something impossible with linear voltage regulators. | ||
| + | |||
| + | While learning about SMPS, teachers typically try to gradually ease you into understanding them by starting with perhaps the easiest-to-understand switching converter, the buck converter. | ||
| + | Then they move on to the other "simple" converters than can be built using 1 inductor, 1 switch, 1 diode, and 1 capacitor (and some stuff that turns the switch on and off "appropriately"): the buck converter, the boost converter, and the inverting converter. | ||
| + | Then they throw every equation even remotely related to SMPS at you, making them sound far more complicated than they really are. | ||
| + | |||
| + | In practice, it seems that many switchers are "flyback" converters -- although some people say that Cuk converters are better than flyback converters; some even go so far as to say that Cuk converters are the "optimum topology". | ||
| + | |||
== further reading == | == further reading == | ||
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* [http://electronicdesign.com/Articles/ArticleID/15420/15420.html "Germanium Dual-Boost Starts At 260 mV"] by Clayton B. Grantham 2007 | * [http://electronicdesign.com/Articles/ArticleID/15420/15420.html "Germanium Dual-Boost Starts At 260 mV"] by Clayton B. Grantham 2007 | ||
* [http://focus.ti.com/lit/ml/slup067/slup067.pdf "Switching power supply topology review"] by Lloyd H. Dixon, Jr. 2001 | * [http://focus.ti.com/lit/ml/slup067/slup067.pdf "Switching power supply topology review"] by Lloyd H. Dixon, Jr. 2001 | ||
| + | * [http://www.national.com/onlineseminar/2001/bpease/switching_controllers.html National: "Designing DC-DC Power Supplies Using High Performance Switching Controllers"] | ||
| + | * "High-voltage, low-noise dc/dc converters" http://www.edn.com/article/CA6582859.html?spacedesc=readersChoice and http://www.edn.com/blog/1700000170/post/440031844.html : has nice photos of dead-bug solid-copper-plane wiring style. | ||
| + | * [http://www.national.com/nationaledge/mar03/article.html "Comparing Topologies and the (Design) Rules of the Game"] by Sanjaya Maniktala 2002 ... emphasizes "r", the ripple factor, the ratio of the ripple in the inductor to the average current in the inductor, which applies to practically every SMPS topology. It describes "The formal design procedure for any converter design". | ||
Revision as of 22:51, 5 February 2010
A "voltage regulator" is designed to hold a constant output voltage.
A "switching voltage regulator", usually called a switching regulator, also called a DC to DC converter, accomplishes this goal by rapidly switching a transistor from full on and full off.
A "linear voltage regulator", usually called a "linear regulator", accomplishes the same goal by holding a transistor in its active region, somewhere between full on or full off.
The 723 Voltage Regulator can be used as either a linear or a switching regulator.
The Linuxstamp uses a the LTC3407-3 switching regulator.
The ARMUS Embedded Linux Board uses ...
The MCP1252/3 Flyback Switching Regulators can generate an output voltage greater than the input voltage -- something impossible with linear voltage regulators.
While learning about SMPS, teachers typically try to gradually ease you into understanding them by starting with perhaps the easiest-to-understand switching converter, the buck converter. Then they move on to the other "simple" converters than can be built using 1 inductor, 1 switch, 1 diode, and 1 capacitor (and some stuff that turns the switch on and off "appropriately"): the buck converter, the boost converter, and the inverting converter. Then they throw every equation even remotely related to SMPS at you, making them sound far more complicated than they really are.
In practice, it seems that many switchers are "flyback" converters -- although some people say that Cuk converters are better than flyback converters; some even go so far as to say that Cuk converters are the "optimum topology".
further reading
- The 3-transistor Black regulator: cheap, high-efficiency, current limited.
- http://en.wikipedia.org/wiki/DC_to_DC_converter
- http://en.wikipedia.org/wiki/Switched-mode_power_supply
- http://smps.us/ "SMPS SWITCHING POWER SUPPLY DESIGN CIRCUITS, SCHEMATICS, PCBs, ELECTRICAL ENGINEERING REFERENCE, SOFTWARE, AND OTHER FREE ONLINE RESOURCES" ... including http://smps.us/layout.html "PRINTED CIRCUIT BOARD LAYOUT GUIDELINES FOR SWITCHING POWER SUPPLIES (SMPS)"
- Massmind: Power discusses a variety of linear and switching power supply regulators
- "boost converter hack" describes one way a microcontroller (uC) can control its own supply voltage, once it's given an initial push. (External diodes would be better than re-using the internal diodes, to avoid exceeding the manufacturer's recommendations).
- "AC DC Switch Mode Supply Controller Via PSoC" discusses programmable current source switching mode controllers.
- "JFET-based dc/dc converter operates from 300-mV supply" by Jim Williams 2006
- "Germanium Dual-Boost Starts At 260 mV" by Clayton B. Grantham 2007
- "Switching power supply topology review" by Lloyd H. Dixon, Jr. 2001
- National: "Designing DC-DC Power Supplies Using High Performance Switching Controllers"
- "High-voltage, low-noise dc/dc converters" http://www.edn.com/article/CA6582859.html?spacedesc=readersChoice and http://www.edn.com/blog/1700000170/post/440031844.html : has nice photos of dead-bug solid-copper-plane wiring style.
- "Comparing Topologies and the (Design) Rules of the Game" by Sanjaya Maniktala 2002 ... emphasizes "r", the ripple factor, the ratio of the ripple in the inductor to the average current in the inductor, which applies to practically every SMPS topology. It describes "The formal design procedure for any converter design".
