PSU from an Epson printer to power the UMZCH. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Power Supplies

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Giving way to more advanced products, computer devices manufactured in the 90s of the last century are completing their "life cycle" en masse.

So, for example, dot-matrix printers, replaced by printers with inkjet and laser printing principles, go down in history. Not all components of dot matrix printers are equally subject to wear and aging, therefore, when disassembling such printers for spare parts, it makes sense to use some of their operable components in other devices.

Most dot matrix printers were equipped with sufficiently powerful and compact switching power supplies, which can be successfully used in amateur radio designs.

After disassembling the next dot matrix printer, I found myself in my hands a switching power supply from an Epson printer manufactured in 1998 (Fig. 1).

Unfortunately, the exact name of the printer could not be determined, but the PSU board is marked "EPS-IIE C076 PSE". The power supply has two output voltages: +34 V and +5,1 V. The +5,1 V voltage is obtained from the +34 V voltage using a secondary switching regulator. The presence on the board of an oxide capacitor with a capacity of 120 microfarads with an operating voltage of 400 V clearly indicates that the power supply is designed to be connected to a 220 V network, which is required.

After testing the unit, I found out that it is capable of delivering a current of about 2,5 A to the load through the +34 V circuit and about 1 A through the +5,1 V circuit.

Such parameters make it possible to use this PSU to power a stereo amplifier with an output power of 15 ... 18 W per channel, built according to a unipolar power supply scheme. The voltage of 5,1 V can be used to power the control units of the UMZCH, the built-in radio receiver, and the MP-3 player.

Unlike most "television" PSUs, this power supply remains stable when the load current changes from maximum to zero.

To power the UMZCH from such or a similar PSU, it is necessary to make a simple LC filter, the circuit of which is shown in Fig. 2. In the PSU itself, in the +34 V channel, two oxide capacitors C51 and C52 are installed with a capacity of 3300 microfarads each (Fig. 1), but there is no choke filtering ripple and noise. In the additional block (Fig. 2), the +34 V voltage passes through two LC filters, consisting of chokes L1, L3 and capacitors C3, C5, C6. The voltage of +5,1 V also passes additional filtering. Fuses or resettable fuses FU1, FU2 protect the PSU from overloads. Chokes can be wound on rings made of low-frequency ferrite with an outer diameter of 15...20 mm. They contain 15...25 turns of stranded mounting wire.

It is advisable to place the switching power supply unit installed in the UMZCH case in a screen made of perforated tin. If, when the UMZCH is operating at maximum volume, the powerful field-effect transistor Q1 and the powerful Schottky diode D51 installed on the heat sinks in the power supply unit heat up over 60 ° C, it is desirable to screw more efficient heat sinks to them, which will increase the reliability of the power supply unit.

Similar switching power supplies from outdated computer technology can be used not only to power the UMZCH, but also to other electrical and radio equipment, for example, to power a drilling machine, a low-voltage electric soldering iron, large digital displays, etc.

Author: A.Butov, village of Kurba, Yaroslavl region

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