Roberts Warr Electronics News & Resources

The 80-watt MPI-P10H AC/DC ATX is a switching power supply that is designed with convection cooling and RoHS compliant. It is a good power supply for low power and does make no noise. It is manufactured by Magic Power Technology Co Ltd in Taiwan.

The MPI-P10H is designed with universal input, active PFC and can generate 80 watts at 50 degree Celsius under convection cooling or continuously 100 watts and peak 120 watts with 10.2 CFM forced air cooling. This power supply has power fail signals and remote ON/OFF function. For efficient heat conduction it provides U-channel chassis.

The Disk UPS - SI-400 is a CE Certificated product. It’s suitable for 5 1/4 disk size and easy to install. The design is micro-processor based, more reliable and friendly. For saving battery life it’s got a “Green Power” design. It also has a multifunction button for alarm reset, power off and self-test. The Disk is compatible with Windows 95/98/2000 /NT/ME, Linux, SCO UNIX and DOS.

The Rex Series are sine wave inverters of power ratings of 1500W or 3000W. They’re suitable for use in industrial, residential, shore, generator or other backup power applications.

The REX Series’ compact operates as either an inverter or a four stage adaptive battery charger. The inverters also include a UPS function. Unique, intelligent Power Control and Power Assist features address the concerns of limited power sources or boost the capacity of shore or generator power.

The PUP150 Series boasts 150W of power in a compact 6.73″ x 2.85″ x 1.57″ package, has a power factor corrected, 90-264VAC input, and offers fully regulated, single output models ranging from 12VDC to 24VDC. It’s efficiency is 88% minimum which allows the unit to operate without a cooling fan, ensuring quiet operation and high reliability. The operating temperature is 0C to +40C. The units boast 5% total regulation and no minimum load is required

Units are RoHS compliant, and are approved to worldwide 60950 safety standards and Class B radiated and conducted EMI performance.

If you need high qualified charges and switching power supply for electric vehicles, golf scooters and medical machines, it’s highly recommended to use EV and DC series batteries. Lifespan of these batteries are expressed in cycles and deep cycle series type, besides AMG type, GEL type that above 24AH is also available with much better cyclic performance.

AGM deep cycle batteries are recommended to be used for solar energy application. GEL deep cycle batteries are to be used for solar energy application. EV series batteries should be used for light electric vehicles, battery driven golf caddies and wheelchairs etc.. Lifespan of these batteries are expressed in cycles and deep cycle series type, besides AMG type, GEL type that above 24AH is also available with much better cyclic performance.

Protek Electronics’ PM300 Series of 300W is medical and low-profile AC/DC switching power supplies offering a compact, performance packed design with full compliance to worldwide EN60101-1 medical safety standards.
The PM300 Series has a universal 85-264VAC input and is available in 21 models with single and quad outputs. They range from 3.3VDC to 48VDC.

An option is an integral cover and fan assembly that allows for a full 300W of power from 0-50C, with derated output power up to 70C. A U-channel version is also available. It’s capable of 200W of convection cooled power or 300W with 25CFM of moving air.

SI-300/550/600

SI series is the only uninterruptible power supply system (UPS) with the ability to be mounted into a PC case using a 5 1/4″ drive bay. It’s a fully integrated UPS with all necessary components in one handy box providing convenient, space saving, hassle free and power protection solution to your computer.

Features:

• Suitable for 5 1/4 disk size.
• The design is more reliable and friendly as it’s based on micro-processor.
• Auto-select frequency.
• Battery life saving  due to “green power” design.
• Multifunction button for alarm reset, power off and self-test (DC start).
• Battery replacement warning.
• Compatible with Windows 95/98/2000 /NT/ME, Linux, SCO UNIX, & DOS.
• AT/ATX computer compatible.
• Easy installation.
• CE Certificated Product.

The inductance of the new filter: 80μH, output DC current: 200A and volume : 132×171×30mm.

This new design method comes from a novel concept. Once high frequency ferrite magnetic core adopted, the results were as follows:

N Aw Ae
2 2.5 160 cm²
5 6.25 64 cm²
10 12.5 32 cm²
12 15 26.667 cm²
20 25 16 cm²
According to this data, while designing the inductance filter L., the below result can be get:

N=2 Volume：3489.3 cm³
N=5 Volume：1840.2 cm³
N=10 Volume：1626.3 cm³
N=12 Volume：1666.6 cm³
N=20 Volume：2024.4 cm³
Choosing N=5 where the instance that the loop circle count and volume is less, we get the volume and dimension of the inductance filter L(200A 80uH,working frequency > 80KHz). Its gas gap of magnetism way is 2×1.25mm,and the volume is 1840.2 cm³.