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SWITCHED MODEPOWER SUPPLY (SMPS)
General description of Power SupplyBasic principle of PSUand description of main partsBlock diagram of SMPSComparison over Linear supplyAdvantages/Disadvantages of SMPSApplications of SMPSWhat is UPSType of UPSUPS ComponentBlock diagram of Different UPSAdvantages/Disadvantages of UPSApplications of UPS
Power supplies provide the necessary power,voltage and current requirements forelectronic devices. They usually change ac to dc voltage.– For example, 120 volts ac is changed to 13.8voltsdc.
1.2.3.4.Consist of:Transformer – steps ac voltage up or down.Rectifier Diodes – change ac to “ripple” dc.Filter Network – includes capacitors andinductors, smooth out the ripples.Voltage Regulator – keeps the voltage constant.
Half Wave – Full Wave RectifierBridge Rectifier
Capacitors and inductors are used inpowersupply filter networks. The capacitors andinductors smooth out the “ripple” ac to dc.
Grounding is important. Connection integrity is important.– Somewhere neutral and ground are connectedtogether. Bleeder resistors across the filter capacitors“bleed off” charge when supply is turnedoff.
An electrical power supply that incorporates aswitching regulator to convert electrical powerefficiently. It transfers power from a source, to a load, whileconverting voltage and current characteristics. Voltage regulation is achieved by varying theratio of on-to-off time.
Functional Block Diagram of SMPS
Efficiency : Efficiency comparisonsbetween series pass andswitch mode power supplyCost : Cost comparison betweenseries pass and switch modepower supply
Volume / Weight : Adjustable Frequency :Switch mode allows adjusting the frequencyfrom 1 to 300 kHz Flexibility :SMPS more flexible due to capability of adjustingfrequency
Noise :Noise comparison between series pass and SMPS
Advantages of SMPS:1.Lower weight2.Smaller size3. Higher efficiency4.Lower power dissipation5.Wide ac input voltage range6.Reduced costsDisadvantages of SMPS:1.Complexity of the circuit
1. Machine tool industries 2. Security Systems(Closed circuit cameras) 3. Support supplies with PLC’s 4. Personal Computers 5. Mobile Phone chargers
iball 600WRs. 4700Seasonic 500WRs. 3600Antec 750WRs. 6600UMAX 450WRs. 570Cooler master 550WRs. 3800Corsair 750WRs. 10700
AN UNINTERRUPTIBLE POWER SUPPLY (UPS) ISA DEVICE THAT HAS AN ALTERNATE SOURCE OFENERGY THAT CAN PROVIDE POWER WHEN THEPRIMARY POWER SOURCE IS TEMPORARILYDISABLEDTHE SWITCHOVER TIME MUST BE SMALLENOUGH TO NOT CAUSE A DISRUPTION IN THEOPERATION OF THE LOADS
PROTECTS AGAINST MULTIPLE TYPES OF POWERDISTURBANCES ONLY DEVICE THAT PROTECTS AGAINST AN OUTAGE OFFERS PROTECTION AGAINST EQUIPMENT NOT OPERATING PROPERLY COMPUTER AND EQUIPMENT DAMAGE DATA LOSS TIME AND EXPENSE TO RECOVER BACKTOWHERE YOU WERE, IF EVEN POSSIBLE
ON Line UPSOFF Line UPS
CONVERTER - AC TO DC SPD - PROTECTS AGAINST SPIKES AND TRANSIENTS BATTERY STORED ENERGY DEVICE –PROTECTS AGAINST INTERRUPTIONS INVERTER – DC TO AC WAVEFORM SYNTHESIS –PROTECTS AGAINST DC OFFSET AND INTERHARMONICS FILTER – PROTECTS AGAINST HARMONICS, NOTCHING AND NOISE VOLTAGE REGULATOR – PROTECTS AGAINST SAGS, SURGES ANDFLUCTUATIONS MONITOR AND CONTROL HARDWARE / SOFTWARE
AUTOMATICSWITCHCONVERTERAC TO DCINVERTERDC TO ACBATTERYINVERTER FAILCRITICALLOAD(AC)
TERDC TO ACBATTERYAC FAIL
OFF LINE UPS ADVANTAGES AC TO DC CONVERTER / BATTERY CHARGER DOES NOT HAVE TOPROVIDE FULL LOAD POWER (POTENTIALLYCHEAPER) LESS STRESS ON DC TO AC INVERTER SINCE IT RUNS AT NO LOADUNTIL UPS SWITCHES TO BATTERY POWER (POTENTIALLYCHEAPER)ON-LINE UPS ADVANTAGES ZERO SWITCHOVER TIME FROM MAIN LINE TO BATTERY POWER ALWAYS ISOLATED FROM POWER DISTURBANCES ON THE MAINLINE
UPSare used in computers, data processors,data transmitters, microwave relay station,digital controllers and nuclear reactor controlsystem.
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series pass and switch mode power supply Volume / Weight : Adjustable Frequency : Switch mode allows adjusting the frequency from 1 to 300 kHz Flexibility : SMPS more flexible due to capability of adjusting frequency
