SU97603A1 - Method of background compensation in a push-pull amplifier - Google Patents

Description

 , Preddagay; with-method-. Background compensation in a two-stroke amplifier by introducing;, om. P., Voltage into the low-frequency path of the amplifier. : -,, V,; modern-power., Two-stroke, -modules and terminal amplifiers; , -containing.in each shoulder a single lamp, it is necessary ... to provide an in-phase power supply. nak, la, lak-laap, that with a three-phase network. ayryvodit, .k.ner.av.nomernoy;-yes; G.ruzke.f-zz. supply network. Uneven Zhgruzk a,; phase-casting, set :: And; 15, ovyschat., U. level of the background of the modulated generator. To compensate for the background in amplifiers, in which the lamp circuits of the different arms -CxeMj i are fed through a three-phase-V converter in two-phase, usually-in. So the compensation voltage in. low h-astbt tract; The disadvantage of conventional circuits is the complexity of their reTULATION. .-.: - with whole-of-simplification; hrrdess — r. Compensation-ion voltage by constituting the two-phase voltage of the filaments into a single-phase one, whose frequency is two times higher than the frequency of the initial voltage, by detecting the phase voltages of these circuits and adding the rectified voltages. The voltage obtained is introduced into the grid circuits of the final stage:. halves of the secondary winding of the transformer. In the case of the application of the proposed method to amplifiers, for which the progressive cascade is made according to the scathode load scheme, the compensation voltage is given. is entered, c. anode circuit - a pinned cascade. - In FIG. 1 presents — schematic compensation — for a push-pull two-stroke class-B; - in fig. 2 circuit compensation background push. lsilitel, pre-nib of the cascade, which is made on the cathode-load circuit .., Two. : A clock-amplifier-class B (Fig. 1) contains in each arm a single lamina, the power of which is heated to ensure uniform

j 9 eos- 2 -

the load1-; and the phases of the mains power supply network} is sixfold two phase; e; ae. The KOAI sensing voltage is obtained by taking the two-phase voltage of the filament supply circuit by detection. This pasture from the 100 Hz pastokles is introduced in the corresponding phase into the secondary winding breakdown of the downstream transformer.

Since the voltage of the modulator lamps is used as the source of the computed voltage, the operation of the comprexitor does not depend on the state of the network.

Similarly, the compensating effect (due to the supply of compensation voltage to the grid circuit) does not depend on the phase and amplitude ratios in the low-frequency gain path, in that and on the mode of the lamps. This is due to the fact that a change in the slope at the operating point of the lamps (due to a change in bias or anode voltage) gives almost the same change in voltages in the anode circuit as the background voltage (due to the supply of alternating current) and the compensated voltage. wives

The output resistance of the compensating circuit can be made sufficiently small (it is advisable to use selenium bars that can work for low impedances as valves). As a result, the compensation scheme does not affect the operation of the main path.

In an amplifier (Fig. 2), in which the pre-terminal cascade is made according to a cathode load circuit, a compensation voltage is introduced into the anode circuit of the pre-terminal cascade.

Subject invention

Claims (3)

1. A method for compensating the background in a class B push-pull amplifier by introducing a compensation voltage into the low-frequency path of the amplifier, whose glowing circuit of different arms of the circuit is powered from a three-phase network through a three-phase to two-phase converter to ensure uniform load of the network, characterized in that in order to simplify the control process and increase the degree of compensation, the compensation voltage is obtained by converting the two-phase voltage of the supply voltage of the filaments to a single-phase voltage of double frequency By detecting the phase voltages of these circuits and adding the rectified voltages, the resulting voltage is introduced into the grid circuits of the terminal stage. 2. Method according to c. 1, that is, the fact that the compensation voltage is introduced in the circuit section between the halves of the secondary winding of the grid transformer. 3. Modification of the method according to claim 1 in relation to amplifiers in which the pre-terminal cascade is made according to a cathode load circuit, characterized in that the com- put | voltage is introduced into the anode circuit of the pre-terminal cascade. Committee for Inventions and Discoveries at the Council of Ministers of the USSR Editor LM StruveGr. 89 Information and publishing department. Go to pecs. 17.1-59 Volume 0.17 p. L. Zak. 10 Circulation 360Price 25 kopecks Printing house of the Committee on Inventions and Discoveries at the Council of the USSR Soviet L Oskpa, Petrovka, 14.