uninterrupted power supply circuit diagram

uninterrupted power supply schematic

The circuit drawn pertains to a regular industrial UPS (Uninterruptible Power Provide), which shows how the batteries get control throughout an outage in electrical provide or variation beyond the normal limits with the voltage line, without having disruption on the operation supplying a steady regulated output (five Volts by LM7805) and an unregulated supply (twelve Volts).

The input to the primary winding with the transformer (TR1) is 240V. The secondary winding may be raised as much as 15 Volts in case the worth is at least twelve Volts operating two amp. The fuse (FS1) acts as being a mini circuit breaker for defense versus short circuits, or a defective battery cell in actual fact. The presence of electrical power will cause the LED one to light. The light of LED will set off upon power outage along with the UPS battery will consider more than

The circuit was designed to present alot more versatile pattern wherein it can be customized by making use of numerous regulators and batteries to generate regulated and unregulated voltages. Making use of two 12 Volt batteries in sequence and a good input 7815 regulator, can control a 15V provide.

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Power Current Limiter 13v 20A Circuit

This PSU has long been particularly created for current-hungry ham radio transceivers. It delivers safely around 20Amps at thirteen.8V. For reduced currents, a separate existing limiting output, able to 15ma as much as a total of 20A has long been extra. The energy transformer should be able to provide at least 25A at 17.5 to 20V. The decrease the voltage, the reduce energy dissipation.

The rectified existing will be "ironed" by C1, whose capacity will need to not be less than 40.000uF, (a golden rule of close to 2000uF/A), but we suggest fifty.000uF. This capacity could be constructed up by many smaller capacitors in parallel. The base of this design is a basic 12V regulator (7812). The output voltage might be introduced to ideal value (here thirteen.8V) by two exterior resistors (R5 and R6) using this formula: U= 12(1+R5/R6). The very low currents (here 15mA) will maintain the 7812 in its normal perform. As quickly because the present rises over 15ma, the voltage drop on R4 will "open" the Q3, basically handling the high output present. This is actually a PNP transistor (Ic > 25) and current amplification factor of a minimum of twenty. The one which has been tested and confirmed right here is the 2N5683. The existing limiting resistance RL, for that maximum output of twenty Amps must be 0.03 Ohms, rated a minimum of 15W. You possibly can make use of the resistance wire or swap numerous resistors in parallel, totaling the resistance/power values. Values for other currents could be calculated by the rule: RL=0.7/Imax

The RL and Q2 (3A PNP which include BD330) form a brief circuit automated fuse. As quickly as the maximum current reaches 20Amps, the voltage drop more than the resistor RL will open Q2, and thus restrict the B-E Existing of Q3. Parallel to Q2 is Q1, which lights the LED one when the present limiting circuit is active. Once the fuse is active, the Q2 bridges the R3, so the full present would circulation by way of the IC1, and harm it. As a result the R4 is inserted, as to limit the IC1 existing to 15mA. This may make it feasible to run the IC1 without having any cooling aid. The LED two will light up every single time the PSU is switched on.

There is an adjustable current limiter in parallel for the fixed output, thus supplying adjustable present source for scaled-down currents. This circuit is incredibly straightforward also. You might discover that there is no current sensing resistor. But it is definitely there, inside a type of the Rds-on resistance of the N-channel FET, which basically handles the load cutoff from the supply. The perform of the FET is proven in the diagram 2. When the existing Id is rising, the pressure Uds over the resistance Rds rises especially gradually in the starting, but especially quick immediately after the knick. This means, that just before the knick the FET behaves as being a resistor but right after it, works as continuous existing source. The D2, R3 and B-E connection of the Q4 will feeling the Uds voltage with the FET1. When the voltage rises sufficient, the Q4 will shortcut the FET1 gate to mass, and reduce the current circulation via the FET 1 off.

Nonetheless, to allow the FET1 to open, there is particular gate voltage required, which with this case is brought up through the voltage divider consisting of R8, Z1, P1 and R9. So the optimum Gate voltage will probably be the one with the Z1, along with the minimal is going to be around 3V6. The Z1 voltage (Uz1) will therefore establish the max current flowing via the FET one. The diagram two will indicate that for 5 Amps the Uz1 really should be 5V6, and for 20Amps close to 9V6.The Capacitor C4 will determine the “velocity” or the reaction time with the limiter. a hundred uF will make the response time to be about 100ms, and 1n will allow it to be 1us. Inside the created limits, the P1 will restrict the existing output within the array of 15mA to 20A.
You possibly can use each output simultaneously, but the complete output current will be restricted by the value of the RL. This PSU can be built also for greater outputs, as long as the transformer will deal with the present needs, and also you provide adequate cooling for your Q3.

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36V Output L200 Power Supply Circuit

Description
Power supply with variable voltage and fixed current regulation made using the ubiquitous L200C regulator.

Notes
The versatile 5 pin L200C regulator offers both voltage and current regulation in a single package. The IC also features thermal shutdown and input over voltage protection up to 60 Vdc. The package is also available as L200CV which has straight pins for mounting onto a PCB. The above circuit has current limiting of 1 amp, hence Rsc = 0.45 ohm. The output voltage is variable from 2.85V to 36V. For voltages up to 36V then the input voltage, Vcc must be 40V. The supply voltage must always a few volts higher than the maximum output voltage. If you wanted to make a 9 Volt current limited PSU then the input voltage should be a minimum of 12 Volts.

Maximum Power Dissipation
The L200 has internal limiting to reduce the amount of heat dissipation. This happens when the internal junction temperature reaches 150 °C. The datasheet has a graph of the safe operating area, but if drawing maximum output current of 2 amp, the input voltage minus output voltage difference must be less than 20 Volts.

Specifications:
DC Input Voltage: 40V max.
Peak Input Voltage: 60V max. for 10ms
Output Voltage Range: 2.85 to 36V
Output Current Range: 0.1 to 2A
Quiescent Current: 4.2mA
Output Noise: 80uV

The L200 regulator has many versions; L200, L200C, L200CH, L200CV. These are in fact all the same regulator. The main differences between variations are the thermal junction temperature and pinout.
For the L200, the operating junction temperature is -55 to 150 °C
The L200C operating junction temperature is -25 to 150 °C.
The V stands for vertical and is the most common case style; available as a pentawatt package, shown right hand side. The H stands for horizontal and the pins of the L200 are bent at right angles for PCB mounting. The L200T and L200CT are also available but as a TO3-4 layout, this pinout can be seen in the datasheet, link below

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Multiplier Single Pulse Voltage Circuit

Single Pulse Voltage Multiplier
Obtaining higher voltage pulses without a higher voltage power supply

Originally appeared in EDN/Reed Business Information September 18, 2003

Sometimes it's necessary to generate a higher voltage pulse from logic circuits than the circuits themselves can supply. The need to generate a programming pulse for Atmel flash controllers was one of those. In that case, I needed to generate an infrequent pulse that switched from 5 volts to 12 volts in response to a control signal from a microcontroller.

A method that relies on a pushbutton to double the voltage was used in the ATtiny12 fuse restorer, but there, the generation of the +12 volts was done by using a mechanical switch that was manually operated to generate about 18 volts, which was further regulated to +12 volts by a gated regulator. It was good as far as it went, but the generation of the +12 volts could not be triggered by the microcontroller, that is unless one wanted to use an electromechanical relay or elaborate arrangement of switching devices.

The straight-for ward approach to control by a microcontroller could be accomplished by driving a capacitor voltage multiplier (such as in the Seiko display inteface) with a pulse train from a controller's pin, then regulating and switching the resultant voltage, the drawback being that this took a lot of parts.

The circuit below accomplishes the same result. It still uses a transistor to do some switching, and it still needs a pair of diodes and capacitors, as would be used in a conventional multiplier, but it doesn't require a steady stream of pulses and the output voltage is set by a resistor divider as the 100k and 150k resistors make 2 volts that are added to the 10 volt pulse on the transistors' collector. What it doesn't need is a steady stream of pulses to keep the output voltage pumped up all the time.
The basic multiplier cell was inspired by a discussion I had with a well know laser scientist, Mr. Christoph Krah, about laser triggering circuits. After I finished this circuit, I sent it to Mr. Krah to get his opinion of how this circuit related to some of those we discussed years ago. Here is Mr. Krah's taxonomic analysis, which also includes a concise description of circuit operation which I could not improve upon:

"Your circuit seems to be a combination of a Marx and a Cockroft-Walton type multiplier. You charge capacitors in parallel (100uF @ 5V and 100uF at 2V) and then switch them in series by means of a 5V voltage step (5+5+2 = 12V) at the output of the uC. The diodes provide isolation from the power supply."

For many of applications, the diode on the left side can be omitted and the 1k resistor changed to 100k.. This simplifies the circuit at the cost of slightly increasing the rate of droop of the voltage across the first 100 uf capacitor since it will discharge into the 100k resistor as well as driving the base resistor for the transistor and driving the load and 100k/150k voltage divider.

There is no free lunch with this circuit. If the pulse is initiated before the 150k AND 100K resistors charge the 100 uf capacitor sufficiently (60k x 100 uf = 6 seconds), the output voltage will be lower than intended. The charge time of the circuit can be decreased by reducing the values of the capacitors, the output 100 uf capacitor having the most effect because of the high resistance charge path. Reducing the size of the capacitors will make the output pulse droop more quickly.

It should be noted that this circuit also makes a 0 to 10 volt pulse, which appears on the collector of the transistor. If a 0 to 10 volt pulse is desired, the circuitry to the right of the transistor's base resistor may be omitted.

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Gyrator Circuit

Gyrator Circuit

To abstain balance ripple achievement on a ability accumulation agriculture a abundant load, usually a ample amount capacitor is called afterward the rectifier. In this circuit, C1's amount is alone a 470uF. The gyrator ambit works on the assumption that the amount of ascribe capacitance at the base-emitter terminals of a transitor is finer assorted by the changeless advanced accepted gain, HFE of the transistor. In this ambit C2, a 100uF capacitor is finer abstract at the ouput ( Vreg ).

If you accept a dc accepted gain, HFE of 50 for the 2N3055 ability transistor, again the able amount of the cutting capacitor would be 50x this value; or be the aforementioned as application a 5000uF capacitor after the ability transistor. The blueprint beneath shows the achievement voltage and accepted through the amount :-

The amount draws about 400mA. With the achievement anon from the rectifier there is about 5v pk-pk ripple in the output. Application the achievement at the emitter of the transistor things are abundant better. The ambit will booty a few hundred milliseconds for the achievement voltage to balance and ability best value. The advantages are that a smaller, beneath cher backlog capacitor can be acclimated with this ambit to accord a aerial affection smoothed supply.

via : http://www.zen22142.zen.co.uk

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Power Supply Voltage Indicator Circuit

Power Supply Voltage Indicator Circuit

Notes

This simple and hardly odd ambit can acutely appearance the akin of the accumulation voltage (in a beyond device): as continued as the indicator has acceptable 12 volts at its input, LED1 gives steady, ceaseless (for the naked eye) chicken light. If the ascribe voltage avalanche beneath 11 V, LED1 will alpha to blink and the blinking will aloof get slower and slower if the voltage drops added - giving actual bright and automatic representation of the supply's status. The blinking will stop and LED1 will assuredly go out at a little beneath 9 volts.

On the added hand, if the ascribe voltage rises to 13 V, LED2 will alpha to glow, accepting at about abounding ability at 14 V.

The appropriate voltages can be adapted primarily by adjusting the ethics of R1 and R4.

The base-emitter diode of T2 basically aloof stands in for a zener diode. The emitter-collector aisle of T1 is inversely polarized and if the ascribe voltage is aerial abundant - T1 will account oscillations and the abundance will be proportional to the ascribe voltage. The alleviation oscillator ceases cycling back the ascribe voltage gets so low that it no best can account breakdown forth the emitter-collector path.

Not all baby NPN transistors appearance this affectionate of behavior back inversely polarized in a agnate manner, but abounding do. BC337-40 can alpha oscillations at a almost low voltage, added types about crave a volt or two more. If experimenting, be accurate not to bite a aperture through the accessory beneath test: they oscillate at 9-12 V or not at all.

via : http://www.zen22142.zen.co.uk

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L200 Battery charger circuit

A actual simple array charger ambit accepting about-face polarity adumbration is apparent here.The ambit is based on IC L200 . L200 is a bristles pin capricious voltage voltage regulator IC.The charging ambit can be fed by the DC voltage from a arch rectifier or centermost broke rectifier.Here the IC L200 keeps the charging voltage constant.The charging accepted is controlled by the alongside aggregate of the resistors R2 & R3.The POT P1 can be acclimated to acclimatize the charging current.This ambit is advised to allegation a 12 V advance acerbic battery.The transistor t1,diode D3 and LED are acclimated to accomplish a array about-face indicator.In case the array is affiliated in about-face polarity ,the about-face polarity indicator red LED D5 glows.When the charging action is activity on the array charging indicator blooming LED D4 glows.
L200 Battery charger circuit

Notes.

• The circuit can be assembled on a good quality PCB or common board.

• The values of R2 & R3 can be obtained from the equation,

(R2//R3) =( V5-2)/(Io).

Where V5 is the charging voltage (voltage at pin 5) and Io is the charging current.

• The POT R8 can be used for fine adjustments of charging current.

• If battery is connected in reverse polarity the RED LED will glow.

• When the charging is going on the GREEN LED will glow.

• The rectified input voltage to the charger can be 18V.

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AC/DC POWER SUPPLY MINIATURE ISOLATED

AC/DC POWER SUPPLY MINIATURE ISOLATED

AC/DC POWER SUPPLY MINIATURE ISOLATED CIRCUIT uses a novel approach to produce a fully isolated and regulated 5 volts @30ma from the 120vac power line. It uses two tiny SCRs that alternately discharge two capacitors through a miniature high frequency transformer. The voltage spikes produced through the transformer are rectified, filtered and regulated. A very common 8 ohm audio impedance matching transformer can be used for the transformer.

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QRO 600 VOLTS POWER SUPPLY

QRO 600 VOLTS POWER SUPPLY CIRCUIT

Amateur Radio Transmitters application valves such as 807 or1625 works able-bodied with a bowl voltage amid 600V to 700 Volts.The ambit declared actuality is a abounding beachcomber voltage doubler. The achievement voltage is alert the ascribe voltage. For 230V AC ascribe the achievement will be about 600 Volts.

Resister R1 is acclimated to absolute the antecedent aerial voltage and aerial currents. Capacitor C1, C2, C3 calm with coils L1 and L2 anatomy ascribe band filter. The capacitors C4 and C5 protects diodes from aerial voltage transients on the AC band as able-bodied as reduces inter carrier hum accentuation of the R.F best up by the mains. Capacitors C6 and C7 provides abundant clarification for the achievement DC Voltage.

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TL494 200W ATX PC Power Supply

Here I bring you wiring diagram of PCs power supply of DTK company. This power supply has ATX design and 200W performance. I was drawed diagram, when I repaired this power supply. This power supply circuit uses chip TL494. Similar circuit is used in the most power supplies with output power about 200W.Device use push-pull transistor circuit with regulation of output voltage.

TL494 200W ATX PC Power Supply Circuit

Line voltage goes through input filter circuit (C1, R1, T1, C4, T5) to the bridge rectifier. When voltage is switched from 230V to 115V, then rectifier works like a doubler. Varistors Z1 and Z2 have overvoltage protect function on the line input. Thermistor NTCR1 limits input current until capacitors C5 and C6 are charged. R2 and R3 are only for discharge capacitors after disconnecting power supply. When power supply is connected to the line voltage, then at first are charged capacitors C5 and C6 together for about 300V.

Then take a run secondary power supply controlled by transistor Q12 and on his output will be voltage. Behind the voltage regulator IC3 will be voltage 5V, which goes in to the motherboard and it is necessary for turn-on logic and for "Wake on something" functions. Next unstabilized voltage goes through diode D30 to the main control chip IC1 and control transistors Q3 and Q4. When main power supply is running, then this voltage goes from +12V output through diode D.

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10 Amp 13.8 Volt Power Supply

10 Amp 13.8 Volt Power Supply Circuit

10 Amp 13.8 Volt Power Supply Parts List :

R1 1.5K ¼ Watt Resistor (optional, tie pins 6 & 5 of IC1 together if not used.)
R2,R3 0.1 Ohm 10 Watt Resistor (Tech America 900-1002)
R4 270 Ohm ¼ Watt Resistor
R5 680 Ohm ¼ Watt Resistor
R6,R7 0.15 Ohm 10 Watt Resistor (Tech America 900-1006)
R8 2.7K ¼ Watt Resistor
R9 1K Trimmer Potentiometer (RS271-280)
R10 3.3K ¼ Watt Resistor
C1,C2,C3,C4 4700 Microfarad Electrolytic Capacitor 35 Volt (observe polarity)
C5 100 Picofarad Ceramic Disk Capacitor
C6 1000 Microfarad Electrolytic Capacitor 25 Volt (observe polarity)
IC1 LM723 (RS276-1740) Voltage Regulator IC. Socket is recommended.
Q1 TIP3055T (RS276-2020) NPN Transistor (TO-220 Heat Sink Required)
Q2,Q3 2N3055 (RS276-2041) NPN Transistor (Large TO-3 Heat Sink Required)
S1 Any SPST Toggle Switch
F1 3 Amp Fast Blow Fuse
D1-D4 Full Wave Bridge Rectifier (RS276-1185)
T1 18 Volt, 10 Amp Transformer Hammond #165S18 (Digi-Key HM538-ND)

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3000 - 6000 MHz / 50 Watts High Power Amplifier

The BBS26A8CHM ruggedized amplifier system is our latest in microwave solid-state amplifiers. This compact and lightweight system features high power output and excellent efficiency. This amplifier utilizes high power GaN devices. It fits in standard 19-inch equipment racks, weighs less than 70 lbs and is available with or without touch-screen LCD control, Ethernet connectivity and a full range of other options including 400 Hz aircraft power.

Download Datasheet..

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Laser Power Supply Circuit Schematic

Notes

1. T1 is an ordinary 9V 1A transformer connected backwards for step up.

2. R1 MUST be installed on a LARGE heatsink. A good heatsink is the metal case the supply is built in.

3. R2 Protects the laser tube from excess current. It should be soldered directly to the anode terminal on the tube. To find R2, start with a 500K 10W resistor and work down until the tube lights and remains stable.

4. If you have trouble with the tube not starting easily, use a longer anode lead that is wrapped around the tube.

5. Depending on the transformer you use, the circuit may or may not work. I cannot guarantee the operation of this circuit. Build at your own risk. Some transformers contain very few secondary windings which will quickly saturate the core and basically act like a direct short. The more secondary windings (that is, primary in this circuit) the better.

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Transformerless Power Supply Circuit

Transformerless Power Supply Circuit

If you are not accomplished in ambidextrous with it, again leave this activity alone.Although Mains accessories can itself absorb a lot of current, the circuits we body to ascendancy it, usually alone crave a few milliamps. Yet the low voltage ability accumulation is frequently the better allotment of the architecture and a abundant allocation of the cost.

This ambit will accumulation up to about 20ma at 12 volts. It uses capacitive reactance instead of resistance; and it doesn't accomplish actual abundant heat.The ambit draws about 30ma AC. Always use a agglutinate and/or a aqueous resistor to be on the safe side. The ethics accustomed are alone a guide. There should be added than abundant ability accessible for timers, ablaze operated switches, temperature controllers etc, provided that you use an optical isolator as your circuit's achievement device. (E.g. MOC 3010/3020) If a broadcast is unavoidable, use one with a mains voltage braid and about-face the braid application the optical isolator.C1 should be of the 'suppressor type'; fabricated to be affiliated anon beyond the admission Mains Supply. They are about covered with the logos of several altered Safety Standards Authorities. If you charge added current, use a beyond amount capacitor; or put two in parallel; but be accurate of what you are accomplishing to the Watts. The low voltage 'AC' is supplied by ZD1 and ZD2.

The arch rectifier can be any of the baby 'Round', 'In-line', or 'DIL' types; or you could use four abstracted diodes. If you appetite to, you can adapt R2 and ZD3 with a 78 Series regulator. The abounding sized ones will work; but if amplitude is tight, there are some baby 100ma versions accessible in TO 92 blazon cases. They attending like a BC 547. It is additionally account acquainted that abounding baby circuits will assignment with an able supply. You can, of course, adapt any or all of the Zenner diodes in adjustment to aftermath a altered achievement voltage. As for the mains voltage, the advancement apropos the 110v adaptation is aloof that, a suggestion. I haven't congenital it, so be able to agreement a little.

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DC Power Supply Dual-rail Variable Circuit

DC Power Supply Dual-rail Variable Circuit

* The circuit can be placed into the existing Variable DC Power Supply metal cabinet.

* Q1 and Q2 must be mounted on heatsinks. Usually, bolting them to the metal case (through insulating washers etc.) proved effective.

* The full ±15V output can be achieved only if the secondary winding of the supply Transformer used in the Variable DC Power Supply is rated at 48V minimum (center tapped).

* When using this circuit, please set the Current-limit control (P1) of the Variable DC Power Supply to any value comprised in the 50mA - 1A range but not higher.

* The second Op-amp (IC1B) contained in the LM358 chip was not used, but its input pins were tied to the negative supply and the output was left open.

DC Power Supply Dual-rail Variable Part list:

R1 = 4.7K-1/2W
R1 = 4.7K-1/2W
C1 = 100nF-63V
C2 = 220µF-25V
C3 = 220µF-25V
C4 = 100nF-63V
C5 = 100nF-63V
Q1 = BD437
Q2 = BD438
IC1 = LM358

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Power Supply Adjustable 0-30V

The aboriginal affair you charge accept in your workshop/lab is ability supply. In experimenting abounding new cyberbanking ambit design, it is easier if you accept a adjustable adjustable ability supply. Here is an adjustable 0-30 volts ability accumulation design. The ambit schematic diagram is apparent below.

The amount of the ambit is 723 voltage regulator chip circuit. A Darlington brace Q2 Q3 addition the accepted to accord 1A output. The minimum voltage acclimation for this regulator IC is 2 volts aloft V-. Aught volt is accomplished by bartering the V- with a voltage beneath -2V, so the achievement can be adapted to zero. The abrogating accumulation is provided by the apparatus about D3 and D4, counterbalanced by 5.1 Zener diode.

The capricious resistor R3 is acclimated to set the accepted limiter, so your ability accumulation will be save alike back you abbreviate its achievement to ground. To set the aught point, about-face the R11 potentiometer to minimum (counter clockwise) and acclimatize the R12 trimmer potentiometer until the achievement is zero. After this setting, axis the R11 potentiometer to the best will accord about 30V output. If at the best position the achievement is abate than 30V, it’s acceptable acquired by the apparatus tolerance, you can lower the R10 value. Make abiding you use beyond clue for arena affiliation on the PCB, and accommodate acceptable calefaction bore for Q3.

The parts list:

Item	Quantity	Reference	Part
1	1	C1	470uF/63V
2	1	C2	470uF/40V
3	1	C3	2200uF/63V
4	1	C4	100uF/35V
5	1	C5	1nF
6	1	D1	5V1
7	1	D2	33V
8	4	D3,D4,D5,D6	1N4001
9	1	D7	DIODE BRIDGE
10	1	D8	LED
11	1	F1	1.5A
12	1	J1	PLUG AC MALE
13	1	Q1	BC557B
14	1	Q2	BC141
15	1	Q3	Q2N3055
16	1	R1	560R
17	1	R2	2k2/1W
18	2	R3,R5	2k2
19	2	R10,R6	1k2
20	1	R8	100R
21	1	R9	0R33/1W
22	1	R11	POT 10k
23	1	R12	VR 10k
24	1	R13	VR 1k
25	1	T1	30V 1A
26	1	U1	LM723

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