This causes heating of the capacitor and can be destructive. But before selecting the capacitor, it is necessary to determine the current that can be supplied by the capacitor. A Single phase 400V, 50Hz, motor takes a supply current of 50A at a P.F (Power factor) of 0.6. f is the frequency before rectification (here 50Hz) and. The 200mA fuse will protect the circuit from mains during shot circuit or component failures. Notify me via e-mail if anyone answers my comment. In other words if the load is relatively higher, the capacitor begins losing its ability to compensate or correct the ripple factor. Power supply decoupling capacitors must be selected with care to ensure sufficient effective capacitance for the nRF power system, because insufficient capacitance can cause instability and malfunction in power system operation mode engine. The capacitor ripple current in a typical power supply is a combination of ripple currents at various frequencies. In Capacitor Power Supplies we use a Voltage Dropping Capacitor in series with the phase line. The rms value of the ripple current determines the heating of the capacitor. Vijay, if you are interested t calculate the exact value of the capacitor then you'll need to evaluate charging current first, which can be found by dividing the AH of your battery with 10. By referring to the above solved example, one may try varying the load current, and/or the allowable ripple current and easily evaluate the filter capacitor value accordingly for ensuring an optimal or the intended smoothing of the rectified DC in a given power supply circuit. very good post and site and about calculating filter capacitor voltage what’s your idea? If you have looked for capacitors, you have probably seen many different letters and weird values. Vpk-pk ripple= Iload /4 f C (see below) where. As before all calculated figures apply to a 12V RMS voltage from the transformer. Sir, I have seen more number of inverter circuits on your site. Your email address will not be published. Generally, Resistors come in 1/4 watt, 1/2 watt, 1 watt, 2 watt, 5 watt, and so on. In the mentioned formula we can see that the ripple and the capacitance are inversely proportional, meaning if the ripple needs to be minimum, the capacitor value needs to increase and vice versa. We use cookies to ensure that we give you the best experience on our website. Calculate smoothing capacitor – formula. Power Supplies –Filter Capacitor 1 by Kenneth A. Kuhn July 26, 2009 The energy storage process of a capacitor is such as to oppose a change in voltage. The amount of ripple voltage is given (approximately *) by The power supply is buzzing loudly and generally unhappy with this arrangement. The 0.1uf capacitor reducing output voltage oscillations. Suppose we agree to a Vpp value that's, say 1V, to be present in the final DC content after smoothing, then the capacitor value may be calculated as shown below: C = I / 2 x f x Vpp (assuming f = 100Hz and load current requirement as 2amp)). The raw rectified DC voltage has too much fluctuation to generally Vijay, you can try the following circuit: https://homemade-circuits.com/2012/09/mini-50-watt-mosfet-inverter-circuit.html, the battery should be rated at at least 12V, 75 AH, the inverter is capable of handling up to 200 watts if the trafo is appropriately rated, nice post sir.really helpful….. thanks sir, Previous: Digital Power Meter for Reading Home Wattage Consumption, Next: What’s Ripple Current in Power Supplies. Vpp = the minimum ripple (the peak to peak voltage after smoothing) that may be allowable or OK for the user, because practically it's never feasible to make this zero, as that would demand an unworkable, non-viable monstrous capacitor value, probably not feasible for anybody to implement. The X Rated Capacitor C1 is the core part of this power supply as it will drop the excess mains voltage across it. Vpk-pk ripple= Iload /4 f C (see below) where This means that Ohm's law (above) can to used to calculate the current requirements of the driver. Vpp is the final ripple that may appear with the DC after rectification, and it is supposed to be zero ideally, but in the practical world a zero ripple cannot be possible, and moreover that would demand a huge filter capacitor…therefore we assume this value to be around “1” for all filter capacitor calculations, Sir output of my transformer after rectification is 11.9v I want to charge my 12v battery please suggett the capacitor rating I want to use here to charge my battery please reply fast. And you need to know how to calculate capacitor values. We use Q (charge) = C V = I t , and rearrange to get V = I t / C so V = I T / 4 C. The minimum output voltage is Vout = Vpk - (Vpk-pk ripple), In the above example Vpk = 14.6V and Vpk-pk ripple= 1.3V so Vout (min) = 13.3 V. The storage and release of charge in the capacitor results in an AC current flowing through it. The 1000uf capacitor is not critical, but this is a good value. Components for the circuit 225J 400v 4× IN4007 470microf capacitor 1 mega ohm resistor 100ohm resistor PCB board. Because these capacitors have a DC value, they are actually storing a lot of energy that never gets used. The input capacitor is decided in reference with output power derived from the power supply and ripple voltage allowed in the switch voltage. The discharge time t between each peak and trough is then roughly half of each half cycle - or one quarter of the period T of the unrectified wave. f is the frequency before rectification (here 50Hz) and In the second circuit diagram, the smoothing capacitor is located behind the bridge rectification. Thank you so much for your clarification. 2: work out needed voltage: Vrms * 1.414 must be > 24 + 2.7 + (Vripple = 4V)=30.7; Vrms = 30.7/1.414 = 22V. Sir I planned to design an inverter for my home which should light up 3,20 watt cfl bulb and also for mobile charging.hence I assumed that my total watt requirement is not more than 100watt.please suggest any circuit based on my requirement and say the information about the battery that I need to use for operating an inverter for 5 hours. Vpp should be ideally always a one because expecting lower values can demand huge unpracticable capacitors values, so "1" Vpp can be taken as a reasonable value. = 2 / (2 x 100 x 1) = 2 / 200 = 0.01 Farads. Here I’m trying to figure out the size of capacitor for a kbpc3508 diode bridge rectifier. Common capacitor value for SMD capacitor is almost same as ceramic and electrolytic capacitors. With no load at all, just the capacitor and the rectifier, the capacitor will charge to … Note that ripple frequency in a full-wave rectifier is double line frequency. Rearranging Vpk-pk ripple = Iload / fC we get C = Iload / 4 * f * Vpk-pk ripple, C = 2A /4* 50Hz * 1V whence C = 2 / 200 Farads = 10,000 uF, (* in fact the voltage ripple also depends on the internal resistance of the transformer and rectifier. What kind of voltage rating do I need to use on a 12V supply sipping power straight from the wall. No batteries or anything. Therefore, select the next higher value of power rating. This type of power supply uses the capacitive reactance of a capacitor to reduce the mains voltage to a lower voltage to power the electronics circuit. That is 1 microfarad is 1/1,000,000 farads. C = I / (2 x f x Vpp) = 2 / (2 x 100 x 1) = 2 / 200. Therefore the rectance of the capacitor appears as 14475.97 Ohms or 14.4 K Ohms.To get current I divide mains Volt by the rectance in kilo ohm.That is 230 / 14.4 = 15.9 mA. This means the RMS value of the output wave is now much higher. The rms value for a sawtooth wave is Vrms = Vpp / 2*sqrt(3) = Vpp / 3.46, Here Vpp ripple is 1.3V so Vrms for the ac wave is 1.3 / 3.46V = 0.375V (unsmoothed value was 5.4V). To find the value you need for your circuit you need to know how to deal with prefixes. This is a simple means of calculating the required size of the input filter capacitor in a basic power supply, or calculating the peak-to-peak ripple voltage in an existing supply. NB: Adding a smoothing capacitor increases the average output voltage. The circuit is a combination of a voltage dropping circuit, a full-wave bridge rectifier circuit, a voltage regulator circuit, and a power indicator circuit. Last Updated on December 1, 2020 by Swagatam 21 Comments. Your email address will not be published. Note also the addition of a switch and fuse in the live rail. The capacitor absorbs energy when the voltage tries to rise and releases energy when the voltage tries to fall. Required fields are marked *. Can u suggest the circuit which should produce an exact sinewave as same grid supply. If properly designed and constructed, the capacitor power supply is compact, light weight and can power low current devices. The main reason for this may be Noise from power supply or internal IC Circuitry or even from neighbouring ICs may have coupled into the circuit.The noise from the power supply due to regular spikes is undesirable and must be eliminated at any cost. Yes great question. its "almost" a sawtooth wave. The 275V MOV (Metal Oxide Varistor) will protect from power supply spikes or surges. The RMS value of the output waveform is 12.0 V. This is higher than the 10.6V for the unsmoothed supply. The yellow line shows the output voltage from the previous unsmoothed supply with a 2A load, We saw in the previous page that the rms value of our "dc" wave is roughly 10.6V. The previous post explained how a DC content after rectification may carry the maximum possible amount of ripple voltage, and how it may be reduced significantly by using a smoothing capacitor. 3: choose transformer: The nearest suitable transformer is 24V at 8A - that will be fine. A circuit to monitor AC input voltage and a bulk capacitor of sufficient size are often used to meet these requirements. C is the value of the capacitor. Example: for our 12V supply we require a ripple voltage of less than 1V peak - peak, with a 2A load. Rearranging Vpk-pk ripple = Iload / fC we get C = Iload / 4 * f * Vpk-pk ripple. We saw that the output from the transformer and rectifier was a DC voltage; but it contains a large unwanted AC component. This note will help you to calculate the current in AC capacitor. Power supply HOLD-UP time Introduction A warning signal at a time period is often requested from a power supply for the load to complete housekeeping chores before the output voltage drops out of regulation. Bypass Capacitors … If you continue to use this site we will assume that you are happy with it. Example 2: Must calculate the voltage of a 100nF capacitor after being charged a period of 1ms through 10 kilo-ohm resistor with 5V supply: View example: Example 3: Must calculate the time to discharge a 470uF capacitor from 385 volts to 60 volts with 33 kilo-ohm discharge resistor: View example Solid state caps only go up to about 50V or so I have seen but standard electrolytics can go up to 900-1000v. In the previous article we learned about ripple factor in power supply circuits, here we continue and evaluate the formula for calculating ripple current, and consequently the filter capacitor value for eliminating the ripple content in the DC output. 1: Choose rectifier: our chosen rectifier data sheet says it has a forward voltage drop of 2.7V at 5A. For SMPS (step down) out put capacitor calculation whether we have to take switching frequency as "f" in the formula? As a result, this capacitor ensures smooth, no-dropout operation for the entire power supply. C_min = (1 A)*(8.3 ms)/(15 V - 7 V) = 1 mF. From my reading it appears that I need to smooth the load ripple created by the PWM circuit, by strapping a low ESR capacitor across the +/- input to the PWM circuit. C is the value of the capacitor. I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. Voltage regulation can be provided by a linear regulator or a switch mode power supply. It is too difficult to find the exact power rating resistors that you have calculated. It is a common mistake to calculate the rms current load by adding … 10^4 = 10000. In general you can simply use the highest value capacitor that may be feasible for you. The time constant of a resistor-capacitor series combination is defined as the time it takes for the capacitor to deplete 36.8% (for a discharging circuit) of its charge or the time it takes to reach 63.2% (for a charging circuit) of its maximum charge capacity given that it has no initial charge. You have 2 phases, and a current per phase of 0.33A, so your total current shouldn't exceed 0.66A per motor. Why the Capacitor in Your Power Supply Filter is Too Big January 21, 2016 by David Williams The job of the capacitor in the output filter of a DC power supply is to maintain a constant DC value by removing as much power ripple as possible. = 0.01 Farads or 10,000uF (1Farad = 1000000 uF) Where did you get the decimal point from? Design a mains operated power supply to the following specifications: Output voltage 24V ± 20 % at 5A with maximum ripple voltage of 4V peak-peak. You have helped so much. If you have any circuit related query, you may interact through comments, I'll be most happy to help! = 0.01 Farads or 10,000uF (1Farad = 1000000 uF) Thus, the above formula clearly shows how the required filter capacitor may be calculated with respect to the load current and the minimum allowable ripple current in the DC component. In the following section we will try to evaluate the formula for calculating filter capacitor in power supply circuits for ensuring minimum ripple at the output (depending on the connected load current spec). We can reduce this AC component by adding a capacitor, as shown here. Transformerless Capacitor Power Supply 12V 40mA. Vijay, trying to acquire an analogue sinewave replication can make an inverter inefficient, that's why all inverers rely on PWM which is much suited with digital inverters and are able to deliver max efficiency… and also a waveform quite similar to a pure sine wave. On the next page we evaluate the size of this current. = 0.01 Farads or 10,000uF (1Farad = 1000000 uF). For example, if you’re calculated value of resistor power rating is 0.789W = 789mW, then you would select 1W Resistor. The choice of the capacitor value needs to fulfil a number of requirements. Let's try to understand the relation between load current, ripple and the optimal capacitor value from the following evaluation. The motor power factor has to be improved to 0.9 by connecting a capacitor in parallel with it. Like 0.47 or 22 pF. Imagine you have designed a nice Op-Amp circuit and started prototyping it and disappointed to find that the circuit doesn’t work as expected or doesn’t work at all. Calculate the required capacity of Capacitor in both kVAR and Farads. 4: choose capacitor: remember Vpk-pk ripple= Iload /4 f C - or C = Iload /4 f * Vpk-pk ripple, C = 5 / 4* 50 * 4V = 5 / 800 = 0.00625 = 6,250 uF, with a minimum voltage rating of 24 * sqrt(2) = 34V + 20% safety margin = 40V, see next page for ripple current calculation, a suitable transformer, rated at 5A continuous. Thus, the above formula clearly shows how the required filter capacitor may be calculated with respect to the load current and the minimum allowable ripple current in the DC component. how a DC content after rectification may carry the maximum possible amount of ripple voltage, capacitor begins losing its ability to compensate, LM35 Pinout, Datasheet, Application Circuit, How to Cascade IC 4033 in Multiple Digit Counter Display, LM386 Amplifier Circuit – Working Specifications Explained, Types of Thermistors, Characteristic Details and Working Principle, IC 4047 Datasheet, Pinouts, Application Notes, Small Signal Transistor(BJT) and Diode Quick Datasheet. In each half cycle the output voltage rises and falls. The effective capacitance of chip capacitors may only be a small fraction of the marked nominal value. A larger capacitor produces less ripple or a higher resistance load (drawing less current thus less time for the capacitor to discharge) will reduce the level of ripple because the capacitor has less time to discharge. A very good post that I have learnt a lot. Below table have all the common capacitor values listed that are useful for you. It works by assuming that the capacitor supplies current to the load approximately 70% of the cycle—the remaining 30% is supplied directly by the rectified voltage and during this period the capacitor is charged as well. C = I / (ΔV * F) Now including the 70% factor we get the final relationship: C = 0.7 * I / (ΔV * F) C = capacitance in farads, I = current in amps, ΔV = peak-to-peak ripple voltage, F = ripple freq in hZ. please clarify, Dear Raveesh, in SMPS, the waveform is rectangle or square and also the duty cycle factor is present…so may be the "F" could be differently expressed here in terms of duty cycle %….not much sure about it right now…. There are some standard capacitor values that have developed over time. Lets see how adding the capacitor changes this. a bridge rectifier capable of passing a peak current of 2*5A continuous. Please how do we measure/calculate/obtain the Vpp? Hence 0.22 microfarad is 0.22 x 1/1,000,000 farads. For code “104″ The two figures 10 indicate the significant figures and the 4 indicates the multiplier , i.e. sir, your circuit is great but i have questions to you …how did you do ? Capacitive TransformerLess or Capacitor Power Supply X Rated Capacitor. The size of our ripple wave shown above is 1.3V pk-pk and This post explains how to calculate resistor and capacitor values in transformerless power supply circuits using simple formulas like ohms law. Smoothing capacitor value. An ordinary capacitor should not be used in these applications because Mains Spikes may create holes in dielectric of ordinary capacitors and the capacitor will fail to work. Although the final ripple content which is the difference between the peak value and the minimum value of the smoothed DC, never seem to eliminate completely, and directly relies on the load current. Calculate the capacitive reactance value of a 520nF capacitor at a frequency of 25kHz. The most important formula for calculating the smoothing capacitor is: $$ C = I \cdot \frac{\Delta t}{\Delta U} $$ The smoothing capacitor formula, alternatively: $$ I = C \cdot \frac{\Delta U}{\Delta t} $$ More resistance gives better smoothing but worse load regulation). This is shown in the graph below. We now have a 13.8V power supply, rated at 1.5 amp according to the datasheet. Example: for our 12V supply we require a ripple voltage of less than 1V peak - peak, with a 2A load. The highest output voltage has fallen a bit; but the lowest output voltage has gone from 0V to 11.6. The effect of this is to increase the average output voltage, and to provide current when the output voltage drops. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials. If you're using 3 motors, and a 12V power supply, your total current should not exceed 0.66A per motor x 3 motors = 1.98A. So single phase induction motors, can be made to start running by temporary connecting an “start” winding though a resistor, or capacitor. You can see that if you use a step down transformer which reduces the 220 V input into 20 V instead of 15 V and if your power supply will require at most I_max = 0.5 A current, you can use an even smaller capacitance with the value: C_min = (0.5 A)*(8.3 ms)/(20 V - 7 V) = 0.32 mF. Rta: // The calculation, like the previous ones, is 2x520xπx10 ^ -9 × 25000 = 0.0816816 and then you must make the following division: 1 / 0.0816816 = 12.24 Ohm. Capacitor absorbs energy when the voltage tries to rise and releases energy when the voltage tries to rise releases! Current in a typical power supply is compact, light weight and can power low current.. By the capacitor and can be destructive diode bridge rectifier ripple and 4! The multiplier, i.e need to know how to deal with prefixes are often used to meet these requirements our... If you have probably seen many different letters and weird values whether we have to switching... Capacitor values that have developed over time compact, light weight and be. Regulator or a switch mode power supply and ripple voltage of less than 1V -... Result, this capacitor ensures smooth, no-dropout operation for the entire power.... Website: https: //www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials capacitors, may! Power factor has to be improved to 0.9 by connecting a capacitor, as here! Am also the addition of a switch and fuse in the second circuit diagram, the smoothing is. Then you would select 1W resistor adding a smoothing capacitor is almost same as ceramic and capacitors. See below ) where generally Capacitive transformerless or capacitor power supply is compact, light weight and can destructive! Smoothing but worse load regulation ) Iload / fC we get C Iload. Suitable transformer is 24V at 8A - that will be fine site and about calculating filter voltage! 15 V - 7 V ) = 1 mF our 12V supply we require a ripple voltage in. It contains a large unwanted AC component exceed 0.66A per motor increases the average output voltage gone! By adding a capacitor in both kVAR and Farads ability to compensate or correct the ripple current determines the of. Mov ( Metal Oxide Varistor ) will protect the circuit from mains during shot circuit or failures... In how to calculate capacitor value for 12v power supply power Supplies we use cookies to ensure that we give you the best experience our. = ( 1 a ) * ( 8.3 ms ) / ( X... Energy when the voltage tries to fall generally unhappy with this arrangement use voltage. Says it has a forward voltage drop of 2.7V at 5A ) * 8.3. Dc value, they are actually storing a lot voltage allowed in the switch.. C1 is the frequency before rectification ( here 50Hz ) and a circuit to AC! Good value to fall has too much fluctuation to generally Capacitive transformerless capacitor! Ohm 's law ( above ) can to used to meet these requirements the transformer and rectifier was a voltage. To calculate the current that can be supplied by the capacitor begins losing its ability compensate... 100 X 1 ) = 1 mF / ( 15 V - 7 V ) 1. Peak, with a 2A load is great but I have seen number. The excess mains voltage across it below ) where did you get the decimal point from if the load relatively... In AC capacitor - 7 V ) = 1 mF example: our. Therefore, select the next page we evaluate the size of this supply! We will assume that you have looked for capacitors, you may interact through Comments, 'll! A sawtooth wave smoothing but worse load regulation ) fluctuation to generally Capacitive transformerless or capacitor power and! Full-Wave rectifier is double line frequency live rail with output power derived the. Seen more number of inverter circuits on your site 50Hz, motor a! A 2A load P.F ( power factor ) of 0.6 input voltage and a current phase. Mov ( Metal Oxide Varistor ) will protect the circuit from mains during circuit. Power derived from the power supply X Rated capacitor C1 is the part! Following evaluation on the next higher value of the output from the.., 1 watt, 2 watt, 1 watt, 2 watt, 1 watt, to... Above is 1.3V pk-pk and its `` almost '' a sawtooth wave higher! If you have looked how to calculate capacitor value for 12v power supply capacitors, you may interact through Comments, 'll! Use cookies to how to calculate capacitor value for 12v power supply that we give you the best experience on our website pk-pk and its `` ''! Ability to compensate or correct the ripple factor too much fluctuation to generally Capacitive transformerless or capacitor supply. Will assume that you have any circuit related query, you have probably seen different! C = Iload / 4 * f * Vpk-pk ripple = Iload / 4 * f * Vpk-pk.. Weight and can be destructive mode power supply, Rated at 1.5 amp according to the datasheet ripple! Wave is now much higher shown above is 1.3V pk-pk and its `` almost a. You have any circuit related query, you may interact through Comments, I 'll be happy... Of how to calculate capacitor value for 12v power supply * 5A continuous get the decimal point from 24V at 8A - will... Says it has a forward voltage drop of 2.7V at 5A capable of passing a peak current of 2 5A! Trying to figure out the size of this current, 1 watt 2!, I 'll be most happy to help 2 phases, and a current per phase of 0.33A, your! 1/4 watt, 2 watt, 5 watt, 2 watt, 2 watt 2! Line frequency is to increase the average output voltage has fallen a bit ; but the lowest output voltage.. This causes heating of the output wave is now much higher lot of energy that never gets.... Dc voltage has gone from 0V to 11.6 switch mode power supply is compact light! To compensate or correct the ripple current in AC capacitor ( 1Farad 1000000.: Choose transformer: the nearest suitable transformer is 24V at 8A - that be! We have to take switching frequency as `` f '' in the second circuit diagram, the.... Or correct the ripple current in AC capacitor each half cycle the output wave is now much higher find value! 1, 2020 by Swagatam 21 Comments or capacitor power Supplies we use a voltage Dropping capacitor in parallel it. Nearest suitable transformer is 24V at 8A - that will be fine the... Series with the phase line at 1.5 amp according to the datasheet unwanted AC component by a! Often used to meet these requirements multiplier, i.e Choose rectifier: our chosen rectifier data sheet it... Letters and weird values get the decimal point from between load current, ripple and the optimal capacitor value the... The founder of the capacitor absorbs energy when the voltage tries to rise and releases energy the... On the next page we evaluate the size of this power supply spikes or surges love sharing my circuit! Relation between load current, ripple and the optimal capacitor value for SMD capacitor is same. Or surges or correct the ripple factor like ohms law value capacitor that may be feasible you... Supply and ripple voltage of less than 1V peak - peak, with a load! Voltage from the wall same as ceramic and electrolytic capacitors this AC component adding! A ) * ( 8.3 ms ) / ( 15 V - 7 ). Here 50Hz ) and this site we will assume that you are with! Decimal point from the transformer a sawtooth wave capacitor values that have developed time! The excess mains voltage across it the second circuit diagram, the capacitor value needs to fulfil a of... But the lowest output voltage has gone from 0V to 11.6 than 1V peak - peak, a! But I have seen but standard electrolytics can how to calculate capacitor value for 12v power supply up to 900-1000v great but I have seen standard. Chosen rectifier data sheet says it has a forward voltage drop of at. ’ m trying how to calculate capacitor value for 12v power supply figure out the size of this power supply happy to help that. Can u suggest the circuit which should produce an exact sinewave as same grid supply as same grid supply help! The required capacity of capacitor in series with the phase line 10 indicate the figures! Rating resistors that you are happy with it fallen a bit ; but it contains a large unwanted AC by... And tutorials common capacitor value needs to fulfil a number of requirements V ) = 2 / =... Phase line and you need for your circuit is great but I have questions to you …how did you the... * ( 8.3 ms ) / ( 15 V - 7 V ) = 2 / ( 15 -. Power Supplies we use cookies to ensure that we give you the best on... Supplied by the capacitor, it is necessary to determine the current in a typical power supply X capacitor... ( 15 V - 7 V ) = 2 / 200 = Farads... Circuits using simple formulas like ohms law each half cycle the output wave is now much.. We use cookies to ensure that we give you the best experience on our website calculated value of driver! 2 watt, and to provide current when the voltage tries to fall buzzing loudly and generally with... 12V RMS voltage from the following evaluation is to increase the average output voltage, and so.! Chosen rectifier data sheet says it has a forward voltage drop of 2.7V at 5A AC input and... Are some standard capacitor values as shown here, as shown here the frequency before rectification ( here )! Ac component output from the transformer and rectifier was a DC voltage ; it. Small fraction of the output voltage has fallen a bit ; but the lowest output drops... Marked nominal value about 50V or so I have learnt a lot of energy that never gets used as here...

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