SU511673A1

SU511673A1 - Amplifier

Info

Publication number: SU511673A1
Application number: SU2022964A
Authority: SU
Inventors: Виктор Валентинович Попов; Владимир Алексеевич Синяев; Анатолий Иванович Скоков
Original assignee: Минский радиотехнический институт
Priority date: 1974-05-05
Filing date: 1974-05-05
Publication date: 1976-04-25

Description

1one

Изобретение относитс к радиотехнике и может использоватьс в качестве выходного каскада в радиотехнических устройствах.The invention relates to radio engineering and can be used as an output stage in radio engineering devices.

Известен усилитель мощности, содержащий Л транзисторов, включенных последо- вательно относительно П -го источника питани , и соответственно П источников питани , причем коллектор каждого транзистора подключен к соответствующему источнику питани через диод, а нагрузка включена в цепь эмиттера первого транзистора .A power amplifier is known that contains L transistors connected in series with the P-th power source and, accordingly, P power sources, the collector of each transistor being connected to the corresponding power source through a diode and the load connected to the emitter circuit of the first transistor.

Однако известный усилитель характеризуетс сравнительно больщой мощностью рассе ни на транзисторах.However, a known amplifier is characterized by a relatively large power dissipation in transistors.

Целью изобретени вл етс уменьшение мощности рассе ни на каждом транзистореThe aim of the invention is to reduce the power dissipation of each transistor.

Дл этого между каждым диодом и соответствующим источником питани включена накопительна катущка индуктивности, при этом точка соединени катущки индуктивности и диода подключена через другой диод к источнику питани последующего транзистора , коллектор которого соединен через пару посдедовательно соединенных дополнительных диодов с источником питани предществующего транзистора, а точка соединени каждой пары дополнительных диодов через соответствующий конденсатор подключена к выходу переключающего блока, вход которого через дифференцирующую цеп соединен с входом усилител .For this, a cumulative inductor is connected between each diode and the corresponding power source, the connection point of the inductor and diode is connected via another diode to the power supply of the subsequent transistor, the collector of which is connected through a pair of successively connected additional diodes to the power source of the next transistor each pair of additional diodes through the corresponding capacitor is connected to the output of the switching unit, whose input is Without a differentiating circuit connected to the input of the amplifier.

Изобретение по снено чертежами.The invention is illustrated in the drawings.

На фиг. 1 приведена принципиальноструктурна электрическа схема усилител ; на фиг. 2 - кривые напр жений в отдельных точках усилител .FIG. 1 shows a basic electrical amplifier circuit; in fig. 2 - voltage curves at individual points of the amplifier.

Усилитель посто нного тока содержит П транзисторов 1 и п источников питани 2 причем транзисторы 1 включены последовательно относительно п -го источника питани 2, коллектор каждого транзистора 1 через последовательно соединенные диодThe DC amplifier contains N transistors 1 and n power supplies 2 with transistors 1 connected in series with respect to the n-th power source 2, the collector of each transistor 1 through a series-connected diode

3и накопительную катущку индуктивности3 and cumulative inductance coil

Claims

4 is connected to the corresponding power source 2 (according to p. Diodes 3 and coils 4), while the junction point of diode 3 and coils 4 is connected via another diode 5 (1 -1 diodes) to the power source 2 of the subsequent transistor 1, the collector of which is connected through a pair of followers but connected additional diodes 6 and 7 (by D diodes) with the power sources 2 of the preceding transistors 1, and the connection point of each pairs: additional diodes 6, 7 through the corresponding capacitor 8 (capacitors) is connected to the output of the crossover unit 9, the input of which is Res differenpiruyushuyu pep 10 is connected to the input of the amplifier, which is connected as the combined base of transistor 1. In the emitter circuit of the first transistor 1 is turned on the load 11. The amplifier operates as follows. An amplified sinusoidal signal is applied to the input of the amplifier (see Fig. 2, a) Each of the transistors 1 amplifies a certain level of the signal, separating it at the load 11. The power dissipated in each transistor 1 is reduced due to the fact that each of them is powered not only from the corresponding source 2 with a constant voltage, but also from the corresponding coils 4 and capacitors 8. Switching the operating mode from the storage coils 4 to the capacitors 8 is carried out by the switching unit 9, which triggered by the input signal through the differentiation circuit 10 (see Fig. 2, b). When the input voltage is applied (see Fig. 2, a), the intervals t - t-, ..., when Bb..i.i35 operate coils 4., which corresponds to a negative voltage at the output switch block 9 (see Fig. 2c), diodes 3 are closed and capacitors 8 are charged at this time from power supplies 2 through diodes 7. When the input voltage increases, transistors 1 are opened in sequence. When the input signal reaches the power supply level 2 the first transistor 1 opens the next (second) transistor 1, however, its current at this moment is zero and the voltage drop on it as much as possible. Since the current in the load circuit 11 is maintained by the coil 4, in the circuit of the first transistor 1, which from this moment begins to discharge, its current decreases and at the same time the current of the second transistor 1 rises. The sum of these currents forms a current, load 11 to life. The voltage on the collector of the second transistor 1 is reduced due to the emf itself induction of the coil 4 in its circuit, which occurs when its current changes. With further discharge of the coil 4 in the circuit of the first transistor 1, the diode in the same circuit closes c. and the current increase of the second transistor 1 is stopped, which causes a voltage jump across its collector. A further increase in input voltage leads to the opening of the next transistor 1, which operates in a similar way. In this section, the decrease in: the voltage from the switching unit 9 through the capacitors 8 is supplied with a positive voltage (see Fig. 2, b), opening the diodes 6 and closing the diodes 3 and 7. With the closing of the diodes 3, the power sources 2 with coils 4 are turned off and the voltage of the capacitors 8 are the main supply voltage of the amplifier, and due to the power supply of the corresponding transistor 1, the discharge current of the capacitor 8 decreases the voltage on the capacitor 8 in accordance with the decrease of the voltage on the load 11. When the input voltage decreases the yarns are closed in turn by transistors 1, and the amplifier switches to supplying the discharge current to the corresponding capacitor 8, claims. A power amplifier containing l transistors connected in series with the Nth power source and, respectively, l power sources, the collector of each transistor being connected to the corresponding power source through the diode, and the load is connected to the emitter circuit of the first transistor, characterized in that, in order to reduce the power dissipation at each transistor, An accumulative inductance coil is connected between each diode and the corresponding power supply, the connection point of the inductor and diode is connected via a different diode to the power supply of the next transistor, the collector of which is connected through a pair of series-connected additional diodes to the power supply of the preceding transistor, and the connection point of each a pair of additional diode-B through the appropriate capacitor connected to the output of the switching unit, the input of which is through the differential A voltage loop is connected to the input of the amplifier.

FIG g