Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [constant-voltage]

15 questions
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How do constant current constant voltage devices work?

First of all can a device that is constant current also be at the same time constant voltage? In my head I just could not grasp how this device can work. Individually I understand how it works, constant current supplies adjust the voltage to sustain…
Jake quin
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How to make fast CV/CC transition in linear NMOS regulator?

I want to design a linear regulator based on NMOS with CC/CV capability. I made a circuit with two separate loops (CC and CV), each of which is stable. The problem is in the transition moment when the circuit is under light load and the CV loop is…
Vasiliy
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3
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1 answer

Semi-controlled full wave rectifier

First, a little background. I picked up a Canadian-made 1971 Lincoln Idealarc 250 on the cheap with the intention of turning it into a constant voltage capable machine for wire processes. The fan ran rough and AC selection was not working when I got…
Meltingwire
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2
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1 answer

Cell voltage decrease during constant voltage charging

I tried to charge a battery to 100% SoC. This battery has multiple cells in series. After the CC phase, the voltage in the CV phase is set by the charger. Cell voltages are monitored individually. During the CV phase, the data show that the voltage…
PDR17
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2 answers

Lithium-ion battery CV mode

I am working on charging lithium-ion batteries (NMC chemistry, max. charge voltage is 4.2 V). In charging mode, after the cell has reached 4.2 V, the charger goes to CV mode, and after this, charging ends (based on cut-off current). As I understand…
palle venkii Reddy
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1 answer

Stepping down 5.3/12 V DC to 4.8 V

I have load that requires a constant DC voltage of \$4.85 V \pm 10 mV\$ and can draw up to \$3A\$. I have tried to power my load with a \$12V\$ power-supply regulated with a LM350T (+ heat sink), however, I can't dissipate the heat generated by the…
terrakuh
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Modifying a CC converter to act like a CV converter?

I bought 3 DC/DC buck constant current converters instead of constant voltage converters (my intent was to power multiple servos with each one, and these were the only buck converters that fit the voltage / amperage demands of the servos). I cannot…
jhjhjh21
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Korad Power Supply Flashing and Clicking: Both CC and CV

I'm testing a stepper motor (NEMA 34, variable 30-100v, 6 amp stall current). I'm using a variable DC power supply (Korad KD3005D, up to 30v, 5A) to power it. When I supply power to the motor (through the driver, 2HSS86 hybrid driver), as I…
asultan
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Powering 12 V LED strips via a 3S lithium ion battery pack in a tight compartment

I am working on a project for an LED lamp. We are trying to power it via a 3S lithouk ion battery pack delivering up to 12.6 V with a cutoff voltage of 9 V. The brightness of the LEDs at 10.5 V is the lowest we'd like it to be, so we're wasting half…
Hatschi
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Charging a lithium battery in CC/CV mode

First of all, I would like to charge my battery with a constant current. When my battery is charged to 4.2 V, I want to stop the constant-current charging and switch to CV mode. My problem is the following: When I am in constant current, we can…
Clemfraiche
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Constant voltage LED driver to constant current conversion

I have 12 pieces of wrong supplied Meanwell LPV-35-24 LED drivers which are of constant voltage type onboard a vessel. Our lighting fixtures are using constant current drivers and I run out of spares. There is any way to modify those drivers to be…
user328795
0
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1 answer

how to map 1V - 10V to 1.6V to 3.2V for voltage regulation using TL494

I am trying to design the given circuit where pin 1 is the non inverting terminal of comparator where I want to use a ref voltage of 1V - 10V but IC TL494 is accepting a voltage of 1.6V to 3.2V....and pin 2 m trying to give an o/p voltage feedback…
ashu_09
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Making a 12V charger/power supply from a brushless dc motor used as a generator

This is my first question here so if I have done something wrong question-wise iI would like to know. I am building a mini tractor with a small gasoline engine. I want to use a brushless DC motor from a drill as a generator. I don't have the motor…
knir visser
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How to identify CC and CV mode for given readings of load resistance, voltage and corresponding load current?

I want know which is the correct way to approach problems where we have to identify CC and CV mode. Let us consider a question - For various load resistors, connected across \$Channel-1\$ of the DC power supply the following table…
Mirae
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High current flow in voltage regulation using TL494

I am using the given schematic for voltage regulation. When I’m not given the feedback, that is point A and B is not connected, then m getting a pulse of 35 % duty cycle of 0-12 V. But when I’m connecting the feedback (A and B gets connected), then…
silvi09
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