Constant Current Constant Voltage Power Supply Schematic

A constant current source ccs in electronics is a device circuit that produces a constant value of current regardless of source voltage or load resistance.

Constant current constant voltage power supply schematic.

How does the power supply circuit work. The above circuit is for testing only. Rs is the current sense resistor of the power stage used to generate a ramp for the current mode pulse width modulation pwm loop. This circuit produces an output that may be equal to the input supply voltage but the current is well regulated and can never exceed the 5 amp mark.

This power supply has following features. R1 is precisely selected so as to maintain a safe 5 amp maximum current limit that can be withdrawn from the circuit. Hi i m trying to build an adjustable constant current constant voltage power supply using a lm2576. Output voltage 1 30v continuously adjustable.

As is the current sense amplifier gain of the lm5117 which has a typical value of as 10. Voltage causes a current not the other way around so to make a device that provides a constant current no matter the load we have to use negative feedback and convert the current flowing through our load into a voltage. If the load draws current at 1 a the supply will automatically switch to cc mode. In this circuit we use a lm317 to control a mj2955 15 amp pnp transistor.

For example suppose the power supply is set to 5 v and current limit is set to 1 a. The lt3741 simplifies the design of constant current constant voltage regulators by combining an accurate current regulator and an accurate voltage regulator in a single ic thus eliminating power system design trade offs. I need to adjust the voltage to approximately 24v and then set the current limit between 0 and about 4a. I preferably want to use a op amp which will work on a single supply like a lm358.

Irf 9520 then to keep up a constant voltage across the r1. As you can see the cm pin enables you to omit the series power dissipative current sense resistor at the output. The advantage of this outline are. A constant current circuit can also be used as a current limiter.

As they are connected in a serial form so use the together current by i vref r1 while the vref to be defined by the ic2 is 1 25v. Input voltage 12v dc. I easily get continuously adjustable output voltage 1 30v and current 0 6a which is pretty enough for circuit testing and other things i m also using 7805 voltage regulator ic for 5v constant voltage and current. The lt3741 is a synchronous buck dc dc controller designed to regulate output currents up to 20a and output voltages up to 34v with a current regulation accuracy of 6 and a voltage accuracy of 1 5.