Introduction

Highlights of this issue include new product releases from TTi, Linear Technology, austriamicrosystems and Maxim Integrated Products; design features on photovoltaic capacity and single-coil latching relay; power electronics-related design ideas; schedule of CPE 2009 Sixth International Conference-Workshop and DeciElec conference; and research studies on AC/DC power supplies, electronic ballasts, inverters and ICs.

 

April 22nd 2009

Auto-ranging DC power supply with LAN interface
The QPX1200 auto-ranging DC power supply from TTi is available with a LAN (Ethernet) interface in addition to USB and RS-232. The QPX1200 is a 1.2kW unit featuring PowerFlex regulation. This enables it to offer voltage and current combinations between 60V/20A and 20V/50A, making it suitable for a wide range of applications. The power supply includes a linear output stage within its PowerFlex regulator.TTi


High efficiency synchronous buck-boost switching regulator
Linear Technology has introduced a high reliability grade version of the LTC3780. The device is a high efficiency synchronous buck-boost switching regulator DC/DC controller that operates from input voltages above, below or equal to the output voltage. The device operates using a single inductor and can deliver output power up to 150W with a single device. With four-switch synchronous rectification, it can deliver high efficiency.Linear Technology.

300mA DC/DC extends battery life
The AS1331 DC/DC converter from austriamicrosystems uses a topology that provides continuous transitions between buck and boost mode, making it suitable in applications that employ dual- or triple-cell alkaline/NiCad/NiMH batteries, as well as single-cell Li-ion batteries.austriamicrosystems 

Battery switch with four enable inputs
Maxim Integrated Products has introduced the MAX14525 battery switch with four enable inputs. Optimised for disconnecting a Li-ion battery from its load, this device features low 35mOhm Ron and low 0.8µA quiescent supply current. The switch integrates all the necessary components including comparator, logic, MOSFET, etc. and eliminates up to eight additional components with its four control inputs. Maxim Integrated Products
 

Here comes the sun
A report by analysts iSuppli includes the statistic that more than 80% of new PV (photovoltaic) capacity installed worldwide in 2008 was in Europe. The article, written from a US perspective, laments the fact that the US is somewhat lagging in this technology domain. According to iSuppli’s data, European companies supplied 27.4% of global PV cells in terms of wattage in 2008, just bettering China’s total of 25.8%, and exceeding Japan’s 16.2% and the United States’ 13.7%.

Drive a single-coil latching relay without an H-bridge circuit
Single-coil latching relays find use in signal-routing, audio, and automotive systems. To maximise their usefulness and cut power consumption, these coil currents must flow in both directions. Current flowing from the latching relay’s positive pin to the negative pin causes it to latch in its reset position. Current flowing from the negative pin to the positive pin latches the relay in its set position. The relay maintains its position even when you remove the coil current, which saves power after the relay latches.
 

Discrete-component buck converter drives HB LEDs
HB (high-brightness) LEDs require a large amount of current to operate. When driving HB LEDs from a voltage source, you can set the required current with a suitable series resistor. If the voltage source is a battery, then as the battery drains, the LED’s intensity decreases. Also, a series resistance has the disadvantage of power loss through the resistor. A better option is to use a suitable dc/dc converter.

MOSFET prevents battery damage
Sealed-lead-acid batteries, which find wide use in power electronics products, such as UPS (uninterruptible-power supplies), inverters, and emergency lamps, supply power to the load whenever utility power is unavailable. When you restore utility power, a charger supplies the power to the load and charges the batteries. You can add a diode to protect a load from current resulting from a reverse connected battery.

 

CPE 2009 Sixth International Conference-Workshop, 20-22 May 2009, Badajoz, Spain
Conference-Workshop CPE 2009 is aimed at serving as an international wide forum for researchers, practitioners and postgraduate students to exchange new ideas and experiences in the area ofpower electronics application to different systems.

DeciElec, 28 and 29 April 2009, at Tarbes, France
DeciElec is an international conference on energy management systems and power electronics. The event will discuss about the optimisation of power for all electric aircraft and new power electronics semiconductor technologies in the transportation field. This conference will highlight energy management and associated storage components and power electronics systems. It will also throw light on how to develop high temperature and high voltage power electronics.

 

Global Market Trends and Forecasts for AC/DC Power Supplies, Electronic Ballasts, Inverters and ICs
Power electronics manufacturers are facing one of the most challenging periods in recent economic history. Although power supply sales will continue, 2009 is expected to see at least temporary declines in nearly every product sector. This report identifies eight power converter/IC segments that are expected to offer sales for power supply makers this year and into 2010.
 

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