Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Short-Circuit Protection in DC Low-Voltage Systems
#1

Short-Circuit Protection inDC Low-Voltage Systems
Many a times you need topower an adjoining accessorycircuit from the powersupply used in the main module cir- Pratik Panchal cuit. Here is a circuit to derive the additionalpower supply from the main circuit.The main circuit is protected fromany damage due to short-circuit in theadditional power supplycircuit by cutting off thederived supply voltage.The derived supply voltagerestores automaticallywhen shorting is removed.An LED is used to indicatewhether short-circuit existsor not. Author’s prototypeof short-circuit protectionmodule is shown in Fig. 1.In the main power supplycircuit, 230V AC isstepped down by transformerX1 (230VAC primary to0-9V, 300mAsecondary), rectifiedby a fullwaverectifiercomprising diodesD1 throughD4, filtered bycapacitor C1and regulatedby IC 7805 togive regulated5V (O/P1).T r a n s i s -tors SK100 andBC547 are usedto derive thesecondary outputof around5V (O/P2) fromthe main 5Vsupply (O/P1).Working of the circuit is simple. Whenthe 5V DC output from regulator IC7805 is available, transistor BC547conducts through resistors R1 and R3and LED1. As a result, transistor SK100conducts and short-circuit protected 5VDC output appears across O/P2 terminals.The green LED (LED2) glows toindicate the same, while the red LED(LED1) remains off due to the presenceof the same voltage at both of its ends.When O/P2 terminals short, BC547cuts off due to grounding of its base.As a result, SK100 is also cut-off. Thusduring short-circuit, the green LED(LED2) turns off and the red LED(LED1) glows. Capacitors C2 and C3across the main 5V output (O/P1) absorbthe voltage fluctuations occurringdue to short-circuit in O/P2, ensuringdisturbance-free O/P1. The design ofthe circuit is based on the relationshipgiven below:RB = (HFE X Vs)/(1.3 X IL)where,RB = Base resistances of transistorsof SK100 and BC547HFE = 200 for SK100 and 350 forBC547Switching Voltage Vs = 5V1.3 = Safety factorIL = Collector-emitter current oftransistorsAssemble the circuit on a general-purpose PCB and enclose in asuitable cabinet. Connect O/P1 andO/P2 terminals on the front panel ofthe cabinet. Also connect the mainspower cord to feed 230V AC to thetransformer. Connect LED1 and LED2for visual indication


Download full report
http://pecworld.zxqAssets/SOURCE/PDF_fun..._Oct09.pdf
Reply
#2
Where is the full report of this project..
Reply
#3

to get information about the topic "Short-Circuit Protection in DC Low-Voltage Systems"refer the link bellow
https://easystudy.info/Thread-short-circ...9#pid59319
Reply

Marked Categories : short circuit protection using dc low voltage pdf, short circuit protection for a dc low voltage systems, applications of short circuit protection using dc low voltage, short circuit protection in dc low voltage systems, short circut protection in dc low votage systems working prccedure, short circut protction in dc low votage systems, short circuit protection, short circuit protection in dc low voltage, dc short circuit protection, how to protect low voltage d c supply, synopsys on short circuit protection in dc low voltage system, pcb design for short circuit protection in dc low voltage system, short circuit protection in dc low voltage system,

[-]
Quick Reply
Message
Type your reply to this message here.

Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  Investigation and Analysis of Inception Voltage and Field Distribution seminar presentation 1 25,638,320 22-09-2017, 11:06 AM
Last Post: jaseela123
  Low Power, Energy- efficient Domino Logic Circuits project report helper 1 6,126,156 15-09-2017, 01:09 PM
Last Post: jaseela123
  A Series Active Power Filter Based on a Sinusoidal Current-Controlled Voltage-Source project uploader 1 2,849 14-09-2017, 03:47 PM
Last Post: jaseela123
  Advanced Microarchitecture and Circuit Design Techniques seminar addict 1 11,121 12-09-2017, 10:46 AM
Last Post: jaseela123
  Application of High Power Thyristors in HVDC and FACTS Systems pdf project girl 1 1,086 09-09-2017, 01:03 PM
Last Post: jaseela123
  SINGLE PHASE AC VOLTAGE CONTROLLER study tips 1 834 09-09-2017, 11:06 AM
Last Post: jaseela123
  UTILITY SYSTEMS FOR CONTROLLED SOURCES OF REACTIVE POWER ppt study tips 1 1,031 09-09-2017, 10:22 AM
Last Post: jaseela123
  POWER SYSTEM PROTECTION pdf study tips 1 1,464 09-09-2017, 09:08 AM
Last Post: jaseela123
  LM78XX Series Voltage Regulators project uploader 1 1,865 08-09-2017, 11:27 AM
Last Post: jaseela123
  Relay Driver Circuit Report seminar projects maker 1 800 07-09-2017, 10:21 AM
Last Post: jaseela123
This Page May Contain What is Short-Circuit Protection in DC Low-Voltage Systems And Latest Information/News About Short-Circuit Protection in DC Low-Voltage Systems,If Not ...Use Search to get more info about Short-Circuit Protection in DC Low-Voltage Systems Or Ask Here

Options: