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112 Threads found on Voltage Doubler
Are you talking about a capacitor-based voltage doubler? As a general rule you should increase capacitor values, so their charge stays pretty much the same, within, say 10 percent. That is how they convey greater current from one stage to the next. In addition your switching system also needs to have sufficiently low impedance to carry the greater
Hi Guys I had a clock with voltage swing of 0 to 1.8V. I would like to generate a clock with voltage swing of 0 to 3.6V. I knew it can be generated a clock with 1.8V to 3.6V. The supply voltage is 1.8V. Can anyone share some ideas? I am not sure if there have an relative easy way to do it. Thanks a lot
hi i need to design of a rectifier for a rectenna that implant and for ultra low input power(-20dBm) at 900MHZ. what model is better? 1)using single zero-bias schottky diode(HSMS285x)? 2)voltage doubler using zero-bias schottky diode(HSMS285x)? 3)bridge using zero-bias schottky diode(HSMS285x)? 4)using CMOS technology? why? please help me :
Hello guys, from past few days I'm dealing with LPC11U24 cortex M0 micro-controller. I've a system with produce only 2.7V for entire circuit, in short my VCC is 2.7V(I've programmed MCU with power down mode using it's PMU). In my code I'm using UART at 4800 baudrate. Now cumming to the point, I need TTL level shifter(ic or
Hello I am making a special type of indicator to find my keys on the darkness. Usually Tritium-based indicators would be used but I do not want to do so. The solution I found was to use a hybrid system. Glow-in-the-dark pigment (my best one) combined with a UV LED to light it up. A gravitational switch detects when the keys have been moved (when s
Cap values were entered incorrect.. Always Double check.. uF not F Op Amps are not intended to drive inductive boost regulators. For this we use CMOS diode voltage doubler strings with charge pump boost design. See same name in IC's
Hello sir I am making an voltage doubler circuit at 2.45 GHz in ADS 2009. In this I have chosen 100 pF capacitor and 10kohm load resistor. now I am designing a matching circuit using microstrip transmission line in ads. can u suggest me how to find the appropriate length and width of the microstrip transmission line.
Hello Members, I have a following voltage doubler design (Fig.1) with the appropriate DC voltage of 3V at 10 dBm as shown in Fig.2 116048 116049 I wanted your suggestions in following: 1. I want to have a DC voltage of about 1-3 V at the input power level of . How can I
To be honest, I don´t like the JDM topology once the voltage doubler that produce the RS-232 compatible supply seems to be often the root of the writing problem; I suffered a lot using this programer. There are alternative circuits with tiny changes that are more reliable than the original version.
I presume, you are actually talking about input supply rather than inverter output frequency harmonics. My explanation would be that the bus voltage ripple appears in the output voltage, e.g. because the bus voltage variation is not or not completely compensated in the pwm modulator.
To have both a plus and minus voltage at the same time. Inverting the battery terminals still leaves you with one voltage.
Hi All, Ive spent the last couple of days looking into voltage multipliers and I've come up short. I'm looking for a simple way to turn 5 to 12V dc into 20 to 25kv. I've looked at Cockcroft-Walton voltage Multipliers but cant seem to figure how to calculate the required capacitors ( KV and capacitance) and diodes to achieve the end result. Th
Respected Members, I have designed a voltage multiplier/doubler at 950 MHz (0.95 GHz)(Figure below). I am having some trouble in terms of its functionality and design. If you could clarify the following; 1. Is my circuit design appropriate/correct (i.e. simulators, lumped components, values, and rest parameters)? 2. Why Im not getting any in
This looks similar to the concept in op amps. Common-mode rejection allows the differential inputs to ignore equal DC voltage levels. (Example, ambient mains hum getting to the input wires.) Then there is the DC offset, which lets you adjust things so your output is 0V when your input is 0V, instead of your output being something else.
hello everyone, i'm having trouble with this the output of my 3 stage cmos rectifier is 0.4 with input vrf = 0.25V, then if i connect the rectifier to a non-overlapping and self-oscillating clock and a voltage doubler circuit the output of my rectifier becomes 0.16V and the final output of my voltage doubler is 0.5V..but (...)
Hi Please find the attachment file. The question is " how to add the two output voltages?"
My project needs a charge pump that can boost a fixed DC voltage (250mV or less) up to a usable DC output (around 1.8V to power an IC). Since it is energy harvesting our teacher said not to use a supply (VDD) and just purely depend on the input as source (that is the 250mV or less). I have tried using some low-power voltage doubler and it (...)
Anyone knows why the output of the voltage doubler doesn't increase even though i cascade it up to 3rd stage?..Tnx for any answer. i attach the circuit of the 1st stage voltage doubler with its simulated output.
Hi all friends Please ask your friends and love I can not speak English well Our focus as a university teacher training has given me I want to analyze this circuit. My project is focused on the importance Please check the circuit analysis This circuit will give a complete description I ask you to help me and give a complete description abou
A bipolar dual output or voltage doubler configuration can't operate in flyback mode. It's mixed forward/flyback. The voltage ratio of both outputs will respectively vary with converter duty cycle and probably output load. You didn't mention the intended voltage control scheme and accuracy requirements, so we can only guess (...)
It would be inefficient but I think it could be done. The first objective would be to build a voltage doubler so you have a more suitable voltage to do your controlling with. In the final stage the output from the control would then switch one of a pair of transistors to pass one of the batteries voltage through to the (...)
Hi folks. I am designing a voltage doubler in a TSMC process. I used diode-connected native transistors (VTH is a few ten mV) and the schematic is shown in the enclosed pic. When I did transient simulation, I found something weird and different to what I read. At the moment when the transistors were turned on/off, I saw some current spikes, see
Hi I was trying to figure out this circuit but could not figure out its operation. I had done a simple simulation, it seemed to work as per intention, i.e. a DC voltage doubler/multiplier?.. Can somebody help me understand how it works and its circuit tradeoffs. BTW - this is not the typical flying capacitor/switching diodes circuit. its only
For a 555, 50 mA load is too high when you feed a voltage doubler. You will need a transistor output buffer for such load. You can use a two-transistor stage, PNP/NPN, like used in audio amplifiers.
hi! I need 18 volts supply, since i'm having 12 volts transformer i decided to use full wave voltage doubler to raise voltage to 24 volts. But at the output of doubler i'm getting 36 volts :/ and after pluging it to LM7818 at the output of regulator i'm getting 3.5 volts :( In datasheet of LM7818 maximum input (...)
This looks to be a crystal tester rather than an oscillator. I think the intention is that any crystal capable of causing oscillation produces a signal which is passed to the voltage doubling rectifier and in turn makes the transistor conduct and the LED light up. It will never work properly with 1N4007 diodes, their reaction time is far too slow
I want to use MAX44262 as a voltage amplifier. I am using a solar cell as a supply voltage which will be 2V. My question is can I use the same solar cell voltage as an input to the op-amp and amplify it to 3.5 V. I read somewhere that the output voltage of the op-amp can not go higher than the supply (...)
What have you tried so far? What has or has not worked for you? Do you have a schematic of a voltage doubler which you wish to test in simulation? Are you interested in one that is supplied by AC? Or pulsed DC? Sine waves or square waves? In general (and if components could be ideal), the greater the Farad value of the capacitors, the greater
I want to design a half-wave rectifier circuit and a voltage doubler circuit, both of which I need to get an equivalent impedance matching network. How can I go about, doing it in ADS? Thanks in advance.
The bridge (or Greinacher) type qualifies as a full wave voltage doubler. Also the Cockcroft-Walton type. Full wave refers to the fact that the load capacitor receives a charge during both the positive and negative halves of the AC supply cycle. Hence this excludes the Villard doubler. Full-wave has less ripple voltage (...)
22 kHz operation of slow reverse recovery diodes will involve a lot of switching losses. Peak current of the voltage doubler is > 1.2A and cause increased forward losses. I would use 3A/40V schottky diodes.
Hi. recently my solar chargeable led light fixture stopped to won't turn has 3 high brightness led straw hat types,and runs on 2 of 1.2v rechargeable batteries. A LDR turns in on while in dark.The PCB has a COB type ic. Which can not be identified.The other problem is this circuit run on 2.4v only. I googled for such controller,I o
The formula you probably need is this one, to calculate ripple voltage from a load current: Vripple = I / fC*( 2n?/3 + n?/2 - n/6 ) Where: I = load current, amperes f = frequency (50Hz, 60Hz?) C = capacitance, farads (identical for every stage to preserve our sanity) n = number of multiplier stages (that is 1 for a doubler)
The problem is, that that suggestion is just for a single, positive voltage without an inverted one. I assume you are using the top schematic, so you can obtain a negative supply from positive pulses, by using a voltage doubler? (This is the section downstream from C142.) It's not clear if your layout includes that sec
Could some one please explain to me how the output voltage is set by R3, R4 and R5. It can have a maximum output of 12V as is but I wish to modify the circuit to get up to is my version so far but I can't seem to g
After a week and a half of hair tearing frustration and agrivation I have finally done it. I have found a discrete transistor voltage doubler that works nicely in the usual direction but that I was also able to modify and get it to work in the reverse direction, i.e. -12V to -24V All I did was swap all the NPNs for PNPs, reversed the polarity of
Hello, We have 2W xenon flash lamps which run off 12V. They simply use a switch mode charger circuit to charge up the tube cap and then flash the tube. The minimum tube flash voltage is 170V, but we have a supply that only goes up to 150V. Supposing we use the following trigger circuit which doubles the tube voltage for a few hundred
it is best if you post your entire schematic including relays as there may be better ways to switch analog. you can simulate here too if you dont have one. MAX232 also runs on 5Vdc and generates 15V from .1uF.. similar ways clocking >10KHz SQ.wave from 5V with voltage double CR-C previously stated also w
Hi, i want to use this voltage doubler in order to be used with a bistable relay . the voltage doubler will be switched using a microcontroller, and the voltage doubler will be applied to the relay the relay is 5 VDC, so i hav
The circuit is incomplete, as you need an additional switch at Vout connected to a reservoir cap to gnd. Your problem is that you are thinking too much on voltages. For charge pumps, you work with charges! At end of phase1, charge in cap is Q=C∆V=C(Vdd-0) At phase2, charge in cap is Q=C∆V=C(Vout-Vdd) Since no charging/discharging occur
66689 In the design the voltage doubler is used to power internal circuits.Two CAP are external. simulation show big spikes on Vout when wire induction is took in account, especially at the transition from transfer phase to charge phase, a big minus spike occur. Do the switching sequence or the rising speed of the swi
Maybe i am kicking in an already closed door. But if You Already have 15 Volt to drive the mosfet why not use a simple voltage doubler and drive a n-mosfet with opto and totempole. This would drasticly reduce your need for a heatsink and it would improve your switching time of the mosfets (by reducing your switching losses) Maybe reducing your loss
Hello, I have designed a 330W SMPS which runs off 90VAC via a voltage doubler. (it has no PFC because its for audio) I have done an equivalent simulation so as to calculate the mains harmonic currents. I am getting 5.73 Amps at the third harmonic current can this be? PAGE 8 SHOWS input current harmonic limits............
Hello All, I tried to design a voltage doubler circuit. I have used a diode. Initially I have given only a reference designator. It has thrown an error to mention the model name. When I checked the diode properties, it is prompting for below details: Model Name : Device area : Junction perimeter factor : Length : Width : Multiplier :
Hello I am using a DAC with 5 V reference, so the output will vary from 0-5v I need to drive a motor which needs 0-10v. I am still not sure about how much current the motor would need. Will know that by tomorrow but the feedback from the customers tech person is that it will be below 1.5amps. Now the concern is what kind of circuit should
Your transformer is too low in voltage. 25-0-25 = 0-50 or 70.71 V peak, loose 1.6 volts across your diodes and the very max you can get out of it is about 69V DC. Can't you find a 5+ V 6A transformer and wire the secondaries in series. The other alternative is to use a voltage doubler circuit but then you will be short of current, and you (...)
Hi , Can we employ voltage doubler/tripler using capacitor & diode at the output of any switching boost converter to get a higher voltage of our likeness?Is there any limitation in this method..? Regards
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You mean the input rectifier? Your circuit is typically used for 115 V mains voltage. By adding two diodes and a switch, you get a selectable 115/230 V input SMPS, with fixed 300 V bus voltage. It uses a 4-diode bridge rectifier for 230 V and the 2-diode doubler for 115 V. Small SMPS are often wide range 100 - 240 VAC, using a bridge (...)
If you mean a cap/diode doubler, I don't think so. The PWM will control nothing unless the capacitor is huge and on-time rather than C*dV determines the charge transferred. In such a doubler you would probably prefer to modulate frequency which more directly controls delivered current, and can be slaved to voltage if you want by feedback.