Adjustable Switch Mode Power Supply 0.25V 0.5A TL494

Switch Mode DC DC Adjustable Power Supply The TL494 system is the heart of the stabilizer. Elements C13-1.5NF, R14-10K set the frequency of the internal generator work to about 77 kHz. Comparator first, along with elements R7, R8, R9,... Electronics Projects, Adjustable Switch Mode Power Supply 0.25V 0.5A TL494 "dc dc converter circuit, power electronic projects, tl494 circuit, " Date 2019/08/04

Switch Mode DC DC Adjustable Power Supply The TL494 system is the heart of the stabilizer. Elements C13-1.5NF, R14-10K set the frequency of the internal generator work to about 77 kHz. Comparator first, along with elements R7, R8, R9, R15, R16 and C14 are the output voltage stabilization circuit, which the value is regulated by the potentiometer P2. Comparator second with elements R10, R11, R12, R21 and R22 they constitute the current regulator circuit, whose value is set with potentiometer P1. The POW connector enables power supply of the control block and power block with the same voltage (1-2 shorted), or enables power supply control block from an external source, we attach them to pins 2-3, (2-plus, 3-mass).

This voltage should be in the range of 8 … 40 VDC. The CTRL connector allows switching off the stabilizer by providing a voltage of approx. 5 V on pin 2. The connector VALUE is used for regulation potentiometers as in the diagram. Elements T1 BDW84C, D1 F16C20 or BYW29, L1 and C5 form a typical impulse “step-down” converter. The other elements filter the input and output voltages. Lower range current regulation (0 … 0.5A) is difficult to obtain, therefore the scope of practical adjustment is … 0.5A 5A.

• 0 … 25V output voltage
• current limitation 0 … 5A (0.5A … 5A)
• smooth regulation of voltage and current
• possibility of remote switching off the stabilizer
• power supply: 24VAC or 2x24VAC

The system is powered directly from the transformer. Optimal for this purpose should have a 24 VAC secondary voltage or better 2 × 24 VAC and 150 W power. The transformer with a single winding is included as per the diagram. It should be remember to make a solid armature connecting T1 and T2 terminals. For transformer with double voltage, oerodek windings are connected to terminal T2, and clamp T1 is left free. After the first start-up, we have to set maximum voltage of 25 V with potentiometer R7 and maximum current with potentiometer R10. Potentiometer R22 set so that the current is evenly regulated in the entire rotation range of potentiometer P1. If the we expect a long-lasting high load on the stabilizer, we must necessarily use a fan, e.g. 10 × 10.

DC DC Adjustable Power Supply Circuit Schematic

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Tags: dc dc converter circuit, power electronic projects, tl494 circuit

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DC DC Adjustable Power Supply Circuit Schematic

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