# Power Supply In Desktop Computer Biology Essay

Published:

This essay has been submitted by a student. This is not an example of the work written by our professional essay writers.

Power supplies are used for making computer system weather it is desktop or tower to it is laptop it is must used. Here only desktop based computer's power supplies are mentioned.

A poor power supply can reduce the life time of a computer system. On the other hand a high quality Power supply can help to reduce the noise or heat generated within a computer system. So we should use good quality power supply but how we can come to know that this is good and this is bad power supply here are some of the points which make power supply good.

Now a day's power supplies generally work on almost +12V with at least 18A. This can also very for the good performance if the components are also increased.

This paper discusses the comparison of old and current power supplies and also about the different types of power supplies that exist in these days. And discuss the specifications, prices and show the diagrams of them.

## Circuit view 2

Power supply mostly consist of transformer, capacitor, rectifier, cables, and connectors etc. the transfer is step down that is sued to covert the 220 voltage into required less voltage and rectifier is sued for the signals and capacitor issued to achieve at max 5 voltage continuously. This is all about the inside working of desktop power supply. There are many other things as well but the most important behavior is all of the discuss above. The internal working of the circuit in accordance to the signal is shown below.

Internal working of power supply

Schmatic of Today's Power Supply

## Circuit of old power supply

View of old power supply Schematic view

In old power supplies the circuit was almost same and working as also the same but the difference was on the performance of individual components like the transformer do not provide their 100% correct work and we have to use other means of source for that and rectifier was not in the condition to handle the waves as it should be. The above diagram is of one of the old power supply and we can imagine the difference between old and new one by seeing just the internal structure of both the old and new (as above) power supply. First the circuit was complex and now days we have reduce that too.

## Disadvantage in old days power supply

In past the power supplies used in desktop based computer had any issues. Some of them are listed here

Noise

Cost

Power Efficiency

Meant time between failures

Circuit Size

Compatibility Issue

## Noise:

The old power supply had major problem of noise in that. These power supplies were not able to minimize the noise.

## Cost:

These power supplies were also very costly because the circuit in these days were not common so buyer ahs to pay a lot for that.

## Power Efficiency:

It was very poor in power efficiency as compared to now days. The difference was also due to the structure of the mother board as well but it also affects the efficiency of desktop based computers.

## Compatibility Issue:

This can be called as father of all issues as old power supplies has the compatibility issue because if someone's power supply break down mean get damage then it was very hard to find the power supply for the same kind of desktop base computer. And the internal structure was so complex that no one can repair else the manufacturer of that. So user has to face many problems due to this.

## Advantages of current power supply

In today's power supplies we have gained a lot of benefits from the power supply which are

Low or no Noise

Meant time between failures

Power Efficiency

## Low Noise

The today's power supplies have reduced the problem of noise as well. To avoid lot of noise then there are a number of options available. The first option is that use larger fans that move more air through the power supplies and from the system as well at slower speed so we do not feel any kind of noise. Another option is that use "silent power supplies" that has no link with fans and it does not generate any kind of noise.

## Mean time between Failures

For the current power supplies manufacturer have also increase the mean time of usage. And we can use them for large period of time. Because higher the meant time between failure, higher the quality of the power supply we use.

## Power Efficacy

Modern power supplies have also gained the advantage by increasing the power efficiency of computer. As we know that power supplies convert voltages from wall outlets to lower levels in the desktop computer. During this conversion, some power is lost as heat. And the efficiency of desktop computer is determined by how much lower extra power must be put into the power supply to use the computer. And in today's supplies we have to put very low extra power to overcome the heat issue hence in advantage we have gained greater power efficiency.

## 370W Low Noise ATX Power Supply Unit

370W Low Noise ATX Power Supply Unit

## Specification:

370 Watt power supply unit

Form factor: ATX 12Volt

Extra large 120mm fan for optimal cooling with lower noise

Noise level less than 34 dB(a)

Motherboard connector: 24 pin (detachable to 20 pin)

4-pin 12V connector

4x peripheral, 1x floppy drive, 2x S-ATA connectors

CE and LVD approved

Price: Just £24.99

Q- How many of each type of low voltage connector does this PSU have? - Turbo

Answer- 4x HD/Cd connectors 2xFloppy connectors (also p4 compatible)

Q- Does this psu have a pci-e connector - John

Answer- Yes, this product does include that

Q- does it come with the 3pin kettle lead to plug it in to wall socket - dave

Answer- Yes, this product does include that

Q- Will the atx power supply be compatible with motor boards with P6 (Aux) connector? - Bob Bewick

Answer- No sorry this product does not support that.

Q- Will this fit in a Micro ATX Tower? Thanks. - Martin

Answer- No, this will not fit in a Micro-ATX case as it is an ATX supply.

Q- I assume all low voltage computer supply cables and connectors are included with tis PSU? - Ron Lomax

Answer- All internal connections are supplied with the psu. (picture for illustration purposes only)

Q- Does this PSU have the 20 pin and 4 pin motherboard connectors? Thanks - Alex M

Answer- The PSU has both connectors.

Q- would the 20pin motherboard plug fit a [explorer ms6511] motherboard - b tunneey

Answer- As we do not stock the motherboard in question we are unable to advice. Please refer to your product manuals or manufacturer for connectivity details

## 40W Universal Net-book Power Supply

40W Universal Netbook Power Supply

## Spesification:

Universal input voltage Netbook power supply unit for use all over the world (with suitable travel adaptors)

Switchable DC 9.5 / 12/ 19 / 20V netbook power output

3.3 amp / 2 amp current, dependent on voltage setting

Equipped with 5 different laptop connectors and selectable power output

Stabilized output, low ripple and low interference

Built-in overload and short circuit protection

This device is intended for mini-book and netbook PC''s and not suitable for laptops

Universal input voltage Netbook power supply unit for use all over the world

Price: Just £39.99

## Technical Specification:

Input Voltage:

AC 100 - 240V, 50Hz

Input Power Plug:

UK 3 Pin Mains Plug

Input / Output Power Cord Length

1m / 1.4m

Output Voltage:

DC 9.5, 12, 19, 20V

Output Current:

DC 9.5, 12V 3A (3300mA), DC 19,20V 2A (2000mA)

Output Voltage Type:

Variable

Output Power (Max):

40W

Regulated Output:

Yes

Polarity:

Centre Positive

Reversible Polarity:

No

Number of Tips or Sockets:

5

Output Tips/Socket Type:

4.8 x 1.7 x 12mm (DC 9.5V)

4.8 x 1.7 x 12mm (DC 12V)

4.75 x 1.7 x 12mm (DC 19V)

4.0 x 1.7 x 13mm (DC 19V)

5.5 x 2.5 x 12mm (DC 20V)

Switched Mode Supply:

Yes

Efficiency:

80%

Dimensions:

97(l) x 36(w) x 29(d) mm

Weight:

166g

Q- WILL THIS POWER MY MICROWAVE?? - lily da FERRET

Answer- No sorry this product does not support that.

Q- HI WILL I BE ABLE TO USE THIS POWER SUPPLY FOR A ACER LAPTOP IT IS 19V 3,24A i WILL RING THE STORE TOMORROW.THANKS ERIC - eric emery

Answer- No sorry this product does not support that.

Q- Will this support Toshiba notebook 100 12a. - Damian Mc Closkey

Answer- Yes the product does support that.

Q- Will this work on a Toshiba satellite a300 - shaz

Answer- No sorry this product does not support that.

Q- Do you have any advice as to how to check compatibility of a PSU with a laptop - steven elkington

Answer- The unit is regulated adapter so as long the laptop in question matches exactly one of the voltages listed and requires not more current than this PSU can output then the unit should run without any issues.

## 100W 5V / 20A Single Output Power Supply by Heng Fu

http://i9.ebayimg.com/06/i/000/fe/76/37cc_2.JPG

## Specification:

Highly reliable, universal AC input/full range single output power supply. UL and CE approved.

Protected with overload / over and voltage / short circuit.

2 year manufacturers warranty

Dimensions: 7.96" x 3.92" x 1.6"

Complies with RoHS Directive

AC InputÂ VoltageÂ Range: 85-264VAC (120-370VDC) (AC InputÂ VoltageÂ Range: 85-132/ 170-264VAC Selected by Switch)

Input Frequency: 47-63Hz

Inrush Current: Cold Start, 20A/115V, 40A/230V

Input Leakage Current: <0.7mA/230V

Line Regulation (Full Load): <Â± 0.5%

OutputÂ VoltageÂ Adj.Â Range: Â± 10%

Output Overload Protection: 110-130% Constant Current, Auto Recovery

Output Over Voltage Protection: 115-150%

Withstand Voltage: I/P-O/P:3.0KVAC/1min; I/P-F/G:1.5KVAC/1min; O/P-F/G:0.5KVAC/1min

Hold Up Time: 20ms@full load (typical)

Operating temp.& humidity: -10Â°C to 50Â°C (14Â°F - 122Â°F), 20%-93%RH (non-condensing)

Storage temp.& humidity: -20Â°C to 85Â°C (-4Â°F - 185Â°F), 20%-93%RH (non-condensing)

MTBF: 100,000 hours

UL Ref. Number: E258719

Safety Standards: GB4943, UL80950, EN60950

EMC Standards: GB9254, EN55022 classB, EN55024, EN61000-3-2,3, EN61000-4-2,3,4,5,6,8,11

Cooling Method: Convection

## 5V DC 5.5A 30W Regulated Switching Power Supply

http://i6.ebayimg.com/01/i/001/39/ec/6b79_35.JPG

## Specification:

Model: RYD-30A

Input voltage: 110V and 240V.

Lower Power consumption, Lower Temperature, high efficiency.

Short circuit/Over load/ Over voltage/ Over temp protection.

Auto-recovery after protection.

Design with Built-in EMI Filter, improve signal precision.

Output power: 5V 5.5A.

LED indicator for power on

Size: 110mm x78mm x 38mm

Figures 112_0001.jpg picture by pc-electronics

bp1.jpg picture by pc-electronics

112_0003.jpg picture by pc-electronicsÂ Â Â

109_1352.jpg picture by coletec

bp2.jpg picture by pc-electronics

112_0002.jpg picture by pc-electronics

112_0006.jpg picture by pc-electronics

## BlueTek 12v 5v BPA-R350-21NB 350 Watt Power Supply sm71

http://imagehost.vendio.com/a/32050415/aview/WW003-V2.jpg

## Specification:

* Input: 100 - 265V ~ 1.8A 50/60 Hz

* Charger Output: 4.2V-24V /Â 70W 4A MAX

* USB output: 5V 1A (MAX) 5W

Price: £14.99

## Compatible Models

N01

4.8*1.7mm

9.5-10.5V

Asus:9.5V2.315A,9.5V3A, Sony:10.5V1.9A

N02

4.8*1.7mm

11.4-12.6V

HP:12V2.5A, 12V3.5A

Asus:12V3A,

N03

5.5*2.5mm

19.0-21.0V

Lenovo 20V 2A

Delta :20V1.2A,

IBM:20V2A, LG:20V2A,

MSI:20V2A,LS 20V3.25A

N04

4.8*1.7mm

18.0V-20V

Compaq:18.5V1.1A,18.5V2.7A,18.5V3.8A,18.5V3.5A,

Asus:19V2.64A,

NEC:19V2.64A

N05

4.0*1.7mm

18.0-20V

HP:19V 1.58A ,

N06

6.0*4.4mm

15-16.8V

Panasonic:16V2.5A,15.1V2.6A,15.1V2.64A,

Fujitsu:16V2.5A,16V2.8A,16V3.36A,16V3.75A,

Sony:16V2.5A,16V2.1A,16V3.75A,16V4A

N07

5.5*2.5mm

18.0-20V

BenQ:19V 2.1A, Dell:18V1.9A,19V2.4A,19V1.58A,19V3.16A

IBM:19V2.4A,

EI System 20V 3.25A

HP:18V2.3A,19V2.4A, 19V3.16A

Compaq: 18V1.9A,18.5V1.1A,

IBM: 18V1.9A,19V3.16A,

Toshiba: 18V1.1A,18V1.7A, 19V1.58A,19V 3.42A,

Gateway: 19V3.16A,19V3.68A,

Acer: 19V3.42A,

NEC: 19V3.16A,

DELTA: 19V2.64A,19V3.42A,

Liteon :19V3.16A,19V3.42A,

Epson 19V1.23A;

N08

5.5*2.5mm

11.4-12.6V

LCD/ACER, BENQ:12V,3.5A,12V 2A,12V 2.5A, 12V 1A, 12V 3A,12V4A

N09

6.0*4.4mm

18.5-20.5V

Sony: 19.5V 2.15A, 19.5V2.3A,19.5V3A,19.5A3.3A,

Fujitsu:19V3.16A

N10

6.0*4.4mm

13.3-14.7V

DELL :14V3A,

Samsung: 14V3A,14V4A

N11

5.5*1.7mm

18.0-20V

Acer: 19V1.58A,19V3.16A,19V3.42A,

Liteon: 19V 3.42A

N12

4.0*1.7mm

11.4-12.6V

Samsung: 12V3.5A,

Kodak: 12V2A

N13

6.3*3.0mm

14.3-15.8V

Toshiba :15V2A,15V2.7A,15V3A,15V4A,

NEC: 15V4A

N14

5.5*2.5mm

15.0-16.8V

Delta: 15V 1A,

IBM: 16V1.88A,16V2.2A,16V3.36A,16V3.5A,

Acer :16V3.75A

N

7.7*2.5*4.3mm

24V-24.2V

Apple: 24V,1.875A,24V2A,24V2.65A

O

9.5*3.5*4.0mm

24V-24.2V

Apple: 24V,1.875A,24V2A,24V2.65A