SU1385204A1 - Voltage converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used in automation and computing devices as a secondary source of stabilized DC voltage, galvanically developed with a primary one. The purpose of the invention is to increase reliability by simplifying the circuit and improving the quality of controlling the output voltage by expanding the range of regulation. In the converter, trigger pulses are applied through a measuring circuit of a non-linear bridge. Such a combination of functions of the measuring circuit increases the reliability of operation and improves the control mode. The regulator increases the output voltage in proportion to its reduction from the change in input voltage and load current. 1 il.

Description

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The invention relates to electrical engineering, in particular, to converter equipment, and can be used in automation devices and computer equipment as a secondary source of stabilized direct current voltage, galvanically developed with primary voltage.

The purpose of the invention is to increase reliability by simplifying the circuit and improving the quality of controlling the output voltage by expanding the range of adjustment.

The drawing shows a voltage converter circuit.

The voltage converter contains a magneto-transistor generator 1 with a power 2 and a switching 3 transistors and a transformer 4 with a power 5, a switching 6 and an output 7 windings. Winding 7 through rectifying 8 and commuting 9 diodes and inductive capacitive filter on choke 10 and capacitor 11 is connected to nonlinear bridge 12 with zener diodes 13 and 14, resistors 15 and 16 and a control junction of the measuring transistor 17 in the diagonal. Emitter transistor 17 is connected to common point of Zener diode 13 and resistor 15, and base to common point of Zener diode 14 and resistor 16. The collector of measuring transistor 17 through the primary winding 18 of additional transformer 19 is connected to a source of 20 triggering pulses, to which the second the output of resistor 16. The second terminal of the Zener diode 13 is connected to the common point of Drossel 10, capacitor 11 and to the output terminal of the voltage converter.

The device works as follows.

When the power is turned on and there is no pulsed voltage from the source of the triggering pulses 20, the magnet-transistor generator 1 is not energized on its winding 7 and, accordingly, at the output of the converter, the voltage is absent. After applying the pulse voltage from the external source 20 through the resistance 16, it enters the base of the measuring transistor of the source 17 and opens it, resulting in

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the coil 18 of the transformer 19 will flow current pulses that will cause voltage pulses on the secondary winding of the transformer 19. These voltage pulses will periodically switch the switching transistor 3.

When the switching transistor 3 is periodically closed at the base winding of the power transistor 2, an opening voltage pulse appears that opens the power transistor 2, then the power current flows through the winding 5, which causes the opening voltage on the base winding of the transistor 2 to flow ( positive feedback) and the operating voltage on the output winding 7, which is rectified by diode B and through the choke 10 charges the capacitor 11. The pulse duration on the output winding 7 is determined magnetic m state of the core, which depends on. the current in the winding 6 and the state of the switching transistor 3. If the voltage on the capacitor 11 has increased to a value that exceeds the required output voltage, the Zener diode 13 opens and the voltage on the emitter of the measuring transistor 17 closes it, which leads to termination of the excitation of the magneto-transistor generator and, accordingly, to a decrease in the voltage on the capacitor 11 and the output of the transducer. Reduced output eg. This leads to a decrease in the closing voltage at the emitter of the measuring transistor 17 and, accordingly, to opening it with a signal at the base, which leads to the excitation of the magneto-transistor generator 1 and an increase in the voltage at the output. In this way, the change in output voltage is compensated by the change in input voltage and load current. This adjustment mode is characteristic for large changes in the output voltage, while the generator 1 operates in the burst-pulse mode and the remagnetization of the core of the transformer 4 is carried out along the full hysteresis loop.

For small deviations of the output voltage, the regulation will have

quasilinear character

those. the controller will increase the voltage

Claims (1)

Φ r r m v l a inventions A voltage converter comprising a magneto-transistor generator made on power and switching transistors connected respectively to the power and switching windings of the transformer, q the output winding of which is connected through diodes and an inductive-capacitive filter to a non-linear bridge of resistors and zener diodes, the diagonal of which is connected to to the manager 5 to the transition of the measuring transistor, while one of the bridge resistors with the first output is connected / to the base of the measuring transistor, and the first terminal of the primary winding of the additional transformer is connected to the collector, the secondary winding of which is connected to the control transition of the switching transistor, and the source of starting pulses, characterized in that, in order to increase reliability by simplifying the circuit and improving the quality of regulation of the output voltage by expanding the regulation range, the second output of the first the secondary winding of the additional transformer and the second output of the aforementioned resistor are connected to the output of the source of the triggering pulses.