Quantcast Figure 4-1B.Block diagram of a basic power supply

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
 
4-2 Figure 4-1A.—Block diagram of a basic power supply. As illustrated in view B of figure 4-1, the first section is the TRANSFORMER. The transformer steps up or steps down the input line voltage and isolates the power supply from the power line. The RECTIFIER section converts the alternating current input signal to a pulsating direct current. However, as you proceed in this chapter you will learn that pulsating dc is not desirable. For this reason a FILTER section is used to convert pulsating dc to a purer, more desirable form of dc voltage. Figure 4-1B.—Block diagram of a basic power supply. The final section, the REGULATOR, does just what the name implies. It maintains the output of the power supply at a constant level in spite of large changes in load current or input line voltages. Now that you know what each section does, let's trace an ac signal through the power supply. At this point you need to see how this signal is altered within each section of the power supply. Later on in the chapter you will see how these changes take place. In view B of figure 4-1, an input signal of 115 volts ac is applied to the primary of the transformer. The transformer is a step-up transformer with a turns ratio of 1:3. You can calculate the output for this transformer by multiplying the input voltage by the ratio of turns in the primary to the ratio of turns in the secondary; therefore, 115 volts ac 3 = 345 volts ac (peak-to- peak) at the output. Because each diode in the rectifier section conducts for 180 degrees of the 360-degree input, the output of the rectifier will be one-half, or approximately 173 volts of pulsating dc. The filter section, a network of resistors, capacitors, or inductors, controls the rise and fall time of the varying signal; consequently, the signal remains at a more constant dc level. You will see the filter process more clearly in the discussion of the actual filter circuits. The output of the filter is a signal of 110 volts dc, with ac ripple riding on the dc. The reason for the lower voltage (average voltage) will be explained later in this chapter. The regulator maintains its output at a constant 110-volt dc level, which is used by the electronic equipment (more commonly called the load). Q1.   What are the four basic sections of a power supply? Q2.   What is the purpose of the rectifier section?


Electrical News
EEVblog #654 – Sydney Maker Faire 2014 Behind The Scenes
Behind the scenes at the 2014 Sydney Mini Maker Faire...
eevblog.com
Don't Let Cables Zap You: Run a Hipot Test
Don't install unsafe cables. Make sure they've been hipot tested...
eetimes.com
Mesh Network Key to Winning IoT Race
As competing wireless networking technologies gun for the smart home...
eetimes.com
Creating a Vetinari Clock Using Antique Analog Meters
Can you imagine a clock formed from old analog meters...
eetimes.com
Microsoft Counters Google Chromebook
Microsoft is gearing up in its fight to bring Windows...
eetimes.com
Startup Promises Sub-$20 DNA Test
Startup InSilixa described a silicon bio-sensing array that promises to...
eetimes.com
Tech Insight: Hacking the Nest Thermostat
Researchers at Black Hat USA demonstrated how they were able...
eetimes.com
A Checkup from the Neckup
Who do you use as a sounding board? Jack Ganssle...
eetimes.com
China Wants to Be No. 1
China aims to produce half the semiconductors it consumes by...
eetimes.com
ARM Stressed in Server Bid
ARM servers will come more slowly and perhaps to fewer...
eetimes.com
EEVblog #653 – Sydney Maker Faire 2014 Highlights
Highlights from the 2014 Sydney Mini Maker Faire Introduction Video...
eevblog.com
Can IoT Integration Kill the Useless Clock Display?
Samsung's recent acquisition of SmartThings puts Samsung in position to...
eetimes.com
EU to Boost RFID Use & Privacy
Can the European Union protect consumer privacy with a new...
eetimes.com
Creating an 8x8x8 3D LED Cube: It's All About the Jigs
Creating an 8x8x8 3D tri-color LED cube from the ground...
eetimes.com
Steve Ballmer Resigns From Microsoft Board
Former Microsoft CEO -- and newly minted LA Clippers owner...
eetimes.com
Memsic Launches Monolithic 3-Axis Accelerometer
Memsic Inc. introduces what it claims is the world's first...
eetimes.com
Engineers: Join Humanitarian Shout Out
It's World Humanitarian Day: Share your stories with colleagues about...
eetimes.com
Startup Sees Enterprise Op for TLC NAND
NxGnData looks to make TLC viable as cold storage for...
eetimes.com
Microcontroller Market Resurges
A full-blown recovery in the microcontroller sector is underway as...
eetimes.com
Synthesize Your Own RTOS for FREE!
SynthOS automatically "synthesizes" an application-specific operating system (ASOS) -- for...
eetimes.com
 


Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +