SU767942A1 - Power amplifier - Google Patents

Description

(54) POWER AMPLIFIERS

one

The invention relates to automation elements and can be used in automation systems.

Known power amplifiers made on transistors using transformers 1 and 2.

Of the known power amplifiers, the closest in technical essence to the invention is an amplifier containing an output transformer, the first and second terminals of the primary winding of which are connected respectively to the collectors of the first and second transistors, the emitter of the first transistor is connected to the emitter of the second transistor, through the power source to the third the output of the primary winding of the output transformer, and through the source of blocking voltage to the first terminals of the first and second secondary windings of the input transformer Matora, second terminals of which are respectively connected to first terminals of the first and second resistors. The nerve and the second terminals of the primary winding of the input transformer are connected to the corresponding inputs of the amplifier, the base of the first transistor is connected via a serially connected third

the resistor and the first secondary winding of the output transformer to the anode of the first diode, the base of the second transistor through the fourth resistor connected in series and the second secondary winding of the output transformer to the anode of the second diode and the first and second terminals of the third secondary winding of the output transformer are connected to the corresponding outputs of the amplifier 2.

The disadvantage of this amplifier is 10 with the limited scope of its application. The purpose of the invention is to extend the scope of the amplifier.

This goal is achieved by introducing a third diode, fifth, sixth, and seventh resistors into a known power amplifier,

5, the third and fourth transistors, the collector and the base of the third transistor are connected respectively to the cathode of the first diode and to the second output of the first resistor, the emitter of the third transistor is connected to the first output of the blocking voltage and respectively to the fifth and sixth resistors the bases of the first and second transistors, and the base of the first transistor is connected via a series-connected retii diode and a seventh resistor to the first one of the second resistor.

The drawing shows a circuit diagram of a power amplifier. It contains the output transformer 1, the first 2 and second 3 transistors, the input transformer 4, the first 5 and second 6 secondary windings of the output transformer, the power supply 7, the blocking voltage source 8, the third 9 and fourth 10 transistors, the first II and second 12 resistors The first 13 and second 14 secondary windings of the input transformer, the third 15 and fourth 16 resistors, the first 17 and second 18 diodes, the fifth 19, sixth 20 and seventh 2G resistors, the third diode 27 primary winding 23 of the input transformer, the primary winding 24 of the output transformer , the first 25 and second 26 inputs of the amplifier, the first 27 and second 28 outputs. Power amplifier works as follows.

The primary winding 23 of the input transformer 4, connected to the inputs 25 and 26 of the amplifier, sends a square-shaped control signal, which from the secondary windings 13 and 14 of the input transformer 4, through the resistors 11 and 12, respectively, is fed to the base of transistor 9 (unlocking voltage) and the base of the transistor 10 (blocking voltage). In this case, the transistor 9 opens and creates an electrical circuit for the passage of the current generated by the voltage on the secondary winding 5 of the output transformer 1. In this case, the current flows through the circuit: diode 17, collector emitter of transistor 9, blocking voltage source 8, emitter base of transistor 2 , resistor 15, which provides OTriHraniyu transistor 2.

When the voltage across the secondary windings 13 and 14 of the input transformer 4 changes, similarly, the transistor 10 opens and the transistor 9 closes. The current along the circuit: diode 17, transistor 9, blocking voltage source 8, transistor 2, resistor 15 stops and the locking of the transistor 2 from the source 8 of the firing voltage through the resistor 19 begins. The unlocking signal on. the transistor 3 will not arrive until the dissipation of excess carriers in transistor 2 is completed and starts (; its locking. The voltage of the secondary winding 6 of the input transformer 1 is changed along the circuit: diode 18, collector-emitter of transistor 10 , a blocking voltage source 8, an emitter-base of the transistor 3, a resistor 16 will flow a current, an unlocking transistor 3. a control signal source is consumed only at the moment of launch. In normal operation, diode 22 It appears locked signal coming from the secondary winding 5 of output transformer 1. Use of the invention allows to extend the field of application to use the power amplifier and its low power steering signals in the presence of sources.

Claims (2)

1. Electronic technology in automation. Sat articles ed. Yu.I. Konev.-M., “Soviet Radio, 1974, no. 6, s. 52. 2. Electronic equipment in automatics. Sat articles ed. Yu. I. Konev., M., “Soviet Radio, 1971, no. 3, s. 154 (prototype).