SU366534A1 - VOLTAGE TRANSFORMER - Google Patents

Description

The invention relates to the field of radio engineering and. It can be used to power pulsed automation devices.

Voltage transducers are known that contain a multivibrator with a transformer coupling, whose transistor emitters are connected to a common power bus, a transistor power switch, a delay target, and a multivibrator control circuit.

The aim of the invention is to improve the noise immunity of the converter.

For this, a power key transistor is connected between the common emitter circuit of the multivibrator with a traditional transformer link and the common power supply, the base of which is connected to the decelerator diode and the multivibrator circuit. A resistor is connected between the collector m of the transistor power switch and the midpoint of the primary side of the transformer.

The drawing shows a circuit diagram of the proposed converter.

The converter contains a push-pull blocking generator assembled on transistors / and 2 and transformer 3. Key transistor 4 is transferred from the collector target of the blocking generator to the emitter one, which simplifies the circuit for switching off the converter. The transfer of the key transistor 4 in the emitter

the blocking-hepheater circuit also makes it possible to reduce the circuit's sensitivity to short (and compared with the operating signal) impulse noise, due to a higher trigger threshold, since the voltage converter can be driven by an external signal; only in the case of full saturation of the key transistor 4 for a time longer than the signal delay in the "make-up circuit consisting of diodes 5, 6 and resistor 7." If the key transistor 4 is not fully saturated, there is no triggering, since the positive feedback in the blocking the generator will be compensated for by the negative feedback, the voltage of which is determined by the resistance m of the incompletely open key traisistor 4. A similar picture is observed under the action of short and mi.i. Better than a signal delay, the target is “recharge. An increase in noise immunity is also achieved by switching on a resistor 8 between the power source and the common point of the emitters of the transistors / and 2 blocking 5 of the generator and collector of the key transistor 4. All the blocking electrode electrodes, the collector base and the emitters are under a common potential. To start the blocking generator, it is necessary to open the key transistor 4.

By varying the resistance value of the resistor 8, it is possible to change the magnitude of the startup value of the entire converter. The inclusion of the resistor 8 allows the transistors / and 2 to be simultaneously stored in the "stored" mode, since all the electrodes are at the same potential.

As a result, only one transistor 4 is in the off state, while in the known circuits there are two transistors under potential. Since transistors have the highest failure rate as compared with the rest of the circuit elements, the reliability of the converter increases. The voltage converter is turned on and off by supplying signals of different polarity from sources 9 and 10 of the signals.

Subject invention

A voltage converter containing a multivibrator with transformer coupling,

The transistor emitters are connected to the bus; the power bus, the transistor power switch, the delay circuit and the multivibrator control circuit, characterized in that, in order to improve noise immunity, the power switch transistor is connected between the common emitter circuit of the multivibrator with a transformer link and the Pitany common bus; Bava of which is connected to the diodes of the delay circuit and to the control circuit of the multivibrator, moreover, a cut is connected between the collector of the transistor switch of the Nitia center of the transformer primary point torus.