Start of section
Production, amateur
Radio amateurs
Aircraft model, rocket-model
Useful, entertaining 		Stealth Master
Electronics
Physics
Technologies
Inventions 		Secrets of the cosmos
Secrets of the Earth
Secrets of the Ocean
Tricks
Map of section
Start
Forum
Use of the site materials is allowed subject to the link (for websites - hyperlinks)

SCHEME OF PULSE TWO POLAR POWER SOURCES AT 60W

The filter coil L1 is wound in 2 wires МГТФ 0,33мм on ring К16х8х5мм 2000НМ1 and contains 20 turns. The transformer T1 is made on the same ring, the primary winding contains 180 turns of PELSHO wire of 0.14 mm , windings 2 and 3 contain 35 turns of PEV-2 wire 0.25 mm , winding is made in 2 wires. T2 is made on the ring K32x16x7mm , winding 1 contains 250 turns of PEV-2 wire of 0.25 mm , and 2 and 3 of 45 turns of PEV-2 wire from 0.4 to 1 mm of wire, depending on what current should be obtained at the output . Rings must be fixed to the board with non-magnetic bolts. Between the layers of all windings in all transformers, it is necessary to lay insulation from the PTFE tape. The device must be shielded with a brass body with a thickness of 1 mm , and connect the screen to the midpoint between C2 and C3 . The shield with the common housing of the device must not be connected, and the housing of the device as a whole must be earthed.

Schematic diagram of a powerful two-polar polar power supply for 60W

The printed circuit board is made of double-sided fiberglass, and it should be noted that the foil on the part side is kept and connected to the power supply screen. The holes for the part are counter-cut by a drill about 2 times as large as the hole itself.

With an output power of up to 100 - 150 mA, radiators for VT1 and VT2 are not required. For DA1 and DA2 radiators are needed in any case. With a large output power, it is also necessary to install bridges D2 and D3 on the radiators.

The cascade of output transistors is protected from the through opening by the logic of operation of digital microcircuits, which provide on the primary winding T1 control pulses in antiphase with an interval between them equal in duration to the pulse itself. The output transistors are connected to the board with wires of minimum length with the maximum diameter of the section.

In addition, it should be noted that the load requires capacities of at least 220 μF , and with a large current strength at the output and even more.

Correctly assembled circuit does not need to be configured. With possible ambiguities, it is necessary to supply logic from a separate power supply with a voltage of 8-10 volts, and supply the mains voltage through Latr , starting at 0 volts. In this case, it is necessary to observe the shape of the signal at the ends of the primary winding of the transformer T2 . The signal should repeat the form close to the form on the primary winding T1 , taking into account the distortions due to the primary winding T2 . If there are differences, then you need to check the corresponding
transistor.

The diode bridges at the output of the converter must be connected to the windings 2 and 3 of T2 in antiphase to equalize the load on VT1 and VT2 .

Several variants of output rectifiers and their coordination with windings are possible. For greater reliability of operation, at the inputs of K142EN ... stabilizers ... it is necessary to install LC filters, in the extreme case (at low currents) it is possible to use RC- chains for filtering RF components of rectified voltage.

print version
Date of publication 29.10.2003gg