SU1725362A1 - Active oscillator - Google Patents

Abstract

The invention relates to a pulse technique and can be used in secondary power sources. The purpose of the invention is to increase reliability. The auto-generator contains transistors 1 and 2, capacitors 3 and 4 of a capacitive divider, the primary winding 5 of a transformer 6, having positive-feedback windings 7 and 8, a capacitor 9 and a resistor 10 of the first RC circuit, a capacitor 11 and a resistor 12 of the second RC circuit, diodes 13 and 14 and a resistor 15. The switching frequency of the oscillator, which is higher than the self-saturation frequency of the transformer 6 magnetic circuit, is required using RC circuits made on elements 9-12. The variation of parameters of all elements is eliminated by continuously adjusting one of the p ican 10, 12 than is achieved symmetry of the oscillator output voltage. 1 il. (Ls

Description

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The invention relates to a pulse technique and can be used in secondary power sources.

The purpose of the invention is to increase reliability by improving the output voltage fronts and reducing base currents by the time the transistors turn off,

The drawing shows a schematic diagram of an auto generator,

The auto-generator contains transistors 1 and 2, capacitors 3 and 4 of a capacitive divider, the primary winding 5 of a transformer 6, having positive-feedback windings 7 and 8, a capacitor 9 and a resistor 10 of the first RC circuit, a capacitor 11 and a resistor 12 of the second RC circuit, diodes 13 and 14 and resistor 15, and transistors 1 and 2 and capacitors 3 and 4 form the shoulders of a bridge, the diagonal of which includes winding 5 of transformer 6, between base and emitter of transistor 1 (2) are consistently included: winding 7 (8) , capacitor 9 (11), resistor 10 (12) and parallel diode 13 (14) in the return direction lenii, and the base of transistor 2 is connected to the collector of the transistor 1 via rezi- Sided 15.

Auto generator works as follows.

The resistor 15, the capacitor 11, the windings 8 and 5, and the transistor 2 form a blocking generator, and when the power is turned on, the capacitor 11 is charged through the high resistance resistor 15. When the voltage on the capacitor 11 reaches the opening level of the transistor 2, the latter opens slightly, through the winding 5 and the capacitor 3 will flow, a voltage will be induced in the winding 8, which will open up the transistor 2 and it will open like an avalanche. After that, the capacitor 11 is charged and the current through the winding 8 stops, and the capacitor 9, previously charged in the opposite direction due to diode 13, begins to discharge through the base-emitter junction of transistor 1 and it opens in the same way.

Thus, capacitors 9 and 11 are alternately charged in one direction from induced EMF of windings 7 and 8 as current flows through diodes 13 and 14, and in the opposite direction alternately discharged (recharge) through base-emitter transitions of transistors 1 and 2. At the same time, the frequency of switching of the autogenerator is necessary, exceeding the frequency of self-saturation of the magnetic circuit of the transformer 5 is established with the help of RC circuits of elements 9, 10 (11,12).

The scatter of parameters of all elements is eliminated by smoothly adjusting one of the resistors 10 (12), thus achieving the symmetry of the output voltage of the autogenerator.

Compared with the known invention, the reliability of starting an auto generator is improved, the fronts of the output voltage are improved, the effect of a through short circuit through transistors is reduced by decreasing the base currents by the time the transistors are turned off, which increases the reliability of the device.

Formula of the Invention An autogenerator containing a bridge, the shoulders of which consist of two transistors and a capacitive voltage divider, respectively, in the diagonal of which is included the primary winding of the transformer, two positive feedback windings and two resistors, in order to increase reliability A third resistor, two diodes and two capacitors are inserted into it, with the first windings of the positive feedback connected to the bases of the respective transistors, the diodes are connected between the base and the emitter, and The output pins are connected via a series-connected capacitor and resistor to the corresponding emitter of the transistor, with the second output of the second winding of the positive connection being connected via the third resistor to the collector of the first transistor.

Claims (1)

Claim An oscillator comprising a bridge, the shoulders of which consist of two transistors and a capacitive voltage divider, respectively, whose diagonal includes the primary winding of the transformer, two positive feedback windings and two resistors, characterized in that, in order to increase reliability, a third resistor is inserted into it, two diodes and two capacitors, while the first terminals of the positive feedback winding are connected to the bases of the respective transistors, diodes are connected between the base and the emitter, and the second terminals are connected es series connected capacitor and resistor to the emitter of the corresponding transistor, the second terminal of the second winding positive connection is connected via a third resistor to the collector of the first transistor.