Powerful voltage converter 12/350 V with pulse generator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Voltage converters, rectifiers, inverters
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Schematic diagram of the converter is shown in the figure. On the DA1 chip, the KR1006VI1 precision timer, a clock pulse generator with an operating frequency of approximately 50 kHz is assembled.
(click to enlarge)
From output 3 of the DA1 chip, the signal is fed to the input of the D-flip-flop DDL. At the outputs Q and Q of the DD1 microcircuit, pulses appear, which, through the drivers on the transistors VT1 and VT2, arrive at the gates of the key transistors VT3, VT4, the load of which is the pulse transformer T1.
The voltage from the secondary winding of the transformer is rectified by a rectifier on diodes VD2 ... VD5 and smoothed by a filter consisting of two capacitors C9 and C10 connected in parallel.
A constant voltage of 350 V is supplied to the thyristor pulse generator.
With the parameters of the elements of the timing circuits indicated in the diagram, the pulse current at the output of the device can reach 10 A (at a voltage of 270 ... 350 V).
In case of overload, the frequency of the output pulses is limited by the elements R23, VD7, C14, which, through the divider R15, R16, supply a voltage that suspends the operation of the generator on the transistor VT5. Resistor R13 can change the duration of the output pulse and thus adjust the output power. Resistor R13 selects the repetition rate of the output pulses.
The following types of radio components are used in the device. Fixed resistors - MLT, R23 - wire, variable resistors R13 and R18 - any type. Non-polar capacitors type K10-17. Transistors VT1, VT2, VT5, VT6 - any silicon type KT315, KT3102 As VT3, VT4, the author used Motorola transistors, but they can be replaced with cheaper domestic-made transistors, choosing, respectively, according to the drain pulse current (at least 10 A ).
Transformer T1 is used industrial from the primary power source of the GoldStar monitor. The secondary windings of the 5 V source were used as windings I, II, and the primary winding of the network key was used as winding III. The transformer can be made independently by winding it on a ring ferrite core of the M2000NM brand, size K38x16x9.
The primary windings contain 6 turns of PEV-2-1,5 mm wire. Secondary winding - 190 turns with PEV-2 wire 00,5 mm. The windings must be carefully insulated, and after debugging the design, it is better to fill them with epoxy. The device must be configured by checking the operation of the circuit nodes with an oscilloscope.
During setup, as a load, it is necessary to connect a load equivalent to the output - two series-connected light bulbs with a power of 100 W at 220 V.
Author: Semyan A.P.
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