SU593299A1 - Push-pull thyristor power amplifier - Google Patents

Description

(54) TWO / GTH TYRISTOR POWER AMPLIFIER

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The invention relates to radio engineering and can be used in radio engineering devices for various purposes and, in particular, in amplifiers of follow-up drives.

A two-stroke thyristor amplifier is known, which contains two output triacs connected in series with respect to a source of alternating voltage and controlled from a source of anti-phase signals, as well as a signal from a thyristor optocoupler, while the connection of the output triacs is the output of amplifier l.

However, a well-known power amplifier due to high values of through currents has low efficiency and reliability.

The stalk of the invention is an increase in efficiency due to a decrease in through currents.

For this, each output of the source of the counter}) aa (of the 1st signals is connected to the control of the input of the output triac from the upper arm through a series of optically connected

A control valve that controls the light diode, a signal and an inhibiting thyristor optocoupler, in each arm, parallel to the output of the simulator, a monitoring sensor is connected, the output of which is connected to the control input of the prohibiting tyrnstorny optic arm, and each switching element of the optically controlled valve is connected to a charging arm, and the switching input of each optically controlled switch is connected to a surge arm. LED LED opposite ploch.

Fig 1 shows the proposed amplifier, structural electrical circuit} ia phi. 2 - push-pull thyristor bridge power amplifier, variant of realization; FIG. 3 is the same, a variant of roping on transistors.

Duple tkrnstorny usnlitolt. power (Fig. 1) contains two output triacs 1 and 2, co-connected in series with sources of belt voltage 3 and control from a source -1 of proactive sishplops - Wuxi output. Joy snmistor lntel. The Eibixon source of 4 prophophase signals is connected to the control input of the dust detector 1 through the "floi; im en} .. HO connected optically-controlled LED 7, the control LED 8, the 1 LED signal and the opto switch 9 and the opto switch 9 The other output of the source 4 of the protol of the 53 OUT signals is connected to the control input of the output triac 2 through the optically controlled gate 1O connected in series, the control light I and AND, the signals and the thyristor optroc 12 and the output one Imistor 1, a KOHTpojjH sensor 13 is turned on, the output of which is connected to the control input of the inhibiting type - (.tristor optocoupler 12; Parallel to the output of the slider 2, the sensor 14 of the control is turned on, the output of which is connected to the control (: 1; 1 thyristor oHTpoEia 9. The switching inputs of the equal at the equal valves 7 and 10 are connected to the control lights of the light emitting diodes 11 and 8. Respectively, the Ushpgel works as follows. In the initial position, the pulses do not come from source 4 of antiphase signals, therefore signal thyristor optocouplers 6 and 5 are turned off, closed. And output triac 1 and 2. There is no current flowing through the load. Upon receipt of positive polarity pulses from source 4, a current flows through the optically controlled valve 7 and control LED 8, under the action of which the signal optocoupler 5 is turned on; in this case, optically controlling the valve 7 shunts the input control circuit of the opposite arm. Since the output CHMiiicTopb 1 and 2 are turned off, the anode-cathode has a voltage applied to the electrodes of the cathode, under the action of which the control current flowing through the sensors 13 and 14 creates conditions for switching prohibiting thyristor optocouplers 9 and 12. As a result, the output triac 1 is turned on and current is flowing through the load. In the next half-period, the output triac 1 is switched on by the negative impedance of the alternating-voltage source,. at the same time, output sistem 2 is closed. 5 9 When changing the polarity of the source 4 of the counter signals (1 az1 signal, the output triac 2 is turned on, and the output triac 1 is turned off, because the optically controlled vectors Yu shunt the input circuit of the photomeasurable imeMti, and for the prohibiting thyristor optocoupler 12 conditions are set for switching. Variable angle switching on the output triacs OB 1 and 2s, you can adjust the voltage and current in the amplifier load / The invention uses two ways to generate a control signal for output triacs. I, Control signal generation regardless of state Neither elements of the power cascade reach the logic circuit of the inhibiting circuit, which is a thyristor optocoupler, which is connected simultaneously with the flow of the control pulse to the opposite control channel, to the control circuit (serially connected control diodes). The formation of the control signal as a function the states of the power cascade elements are achieved by the implementation of a logical coincidence circuit, which is a series of connected two pairs of parallel-parallel GOVERNMENTAL thyristors signal and prohibiting optocouplers. The switching on of the output triac occurs only with simultaneous switching on of the thyristors of the signal and prohibiting optocouplers. The inhibiting optocoupler diode monitors the state of one of the output triacs of the power amplifier. Example Thyristor The 1st power amplifier (Fig. 2) contains output thyristors 15 18, 3 of one diagonal load 19 in each of the arms, and alternating voltage source 2O in the other diagonal, control phase sources 21 and 22, each output thyristor 15 - 18 are connected via serially connected limiting resistors 23 - 26, correspondingly thyristors 27 - 34 signal optocouplers and thyristors 35 - 42 prohibiting optocouplers with the anode of the corresponding output thyristor; Between the poles of the sources 21 and 22 of the antiphase control signals into one parallel circuit, respectively, 1 o are connected; lopptelnch connected control circuits — CH3 – SO, 5–5 thyristors 27–34 signal optocouplers of the opposite arms of the amplifier and control LEDs 51 and 52 controls 53 and 54. Another parallel tseg switched on the switching input (receiver) of the optically controlled valve 53 and 54 connected with the control, LED 5 2 of the anti-fouling switch, control diodes 55 "- 62 thyristors 37 - The 4O prohibiting optocouplers are connected by one of the Voltages through 63-7 Q resistors with the cathode of the output thyristor 15-18 and the other pole of the direct current diodes are connected through the common diodes 71 78 to the anode of the output EShar 15-18 shooting gallery of the adjacent shoulder. To eliminate the shunting of the sensors (diodes), cut-off diodes 79 are installed. The circuit works as follows. In the initial position, the pulses do not come from sources 21 and 22 of antiphase control signals, therefore all the thyristors — 34 signal optocouplers — are turned off, and the power thyristors 15 are closed. 18. No current flows through load 19. Under the action of the positive polarity of the source 21 pulse, the control LEDs 43 - 46 of the signal tcr-optocouplers and the light emitting diode 51 of the optically controlled valve have a current flowing under which the thyristors 32 and 33 of the signal optocouplers turn on and the controlled valve 54, shunt the input control circuit of the protrusion channel. Since the thyristors 16 and 17 are turned off, a voltage appears on the electrodes of the anodode, under the action of which through the control diodes 57 and 59 of the inhibiting optocouplers, the diodes 73 and 7 5i, and the resistors 65 and 67 are flowing, including the thyristors 35 and 41 optocouplers. As a result, the thyristor 15 is turned on with a positive pulse, and the thyristor 18 is turned on negative and a current flows through the load 19. The next half-period of the positive polarity of the source 21 impulse includes the thyristors 28 and 34 of the signal optocouplers and the thyristors 36 and 42 of the prohibiting optocouplers. As a result, the thyristor 15 is turned on with a negative impulse, and the thyristor 18 is positive and a different polarity flows through the load 19. Controlled valve 54 into this semipergnea, with the same polarity of the source of the supply institute, shunts the input circuit of the opposite channel, an overlap. Change the angle wk / pocheni kyhodn5 1; For example, you can adjust the load; jbiiofl polarity of the impulse of the nstochka 22 shunts the input circuit of the canape of the source 21 and the voltage regulation in the load is carried out by the thyristor ED 16, and 17 The use of additional meirroB - signal, octrons, optical, and other gates. crossing broadcasts with certain connections between them (using logical prohibition and coincidence schemes), the proposed push-pull tyrnstorky amplifier is advantageously different from the known one, since the cjiBO3f bie TOIW in the arms of the power amplifier and the false responses of the two control channels at the same time. As a result, the noise immunity at the input at low power of 1 DEF. X Etching increases, the device efficiency and its reliability increase. The absence of signal and transformer amplifiers in the circuit also makes it necessary to fvffiKminiminate radio electronic equipment. L p and m 8 p 2. Usklia-power (Fig. 3) contains two pairs of composite transistors of different conductivity: And-80 80, 81 and 82, 83 and p-And. - P 84, 85 And 86, 87, load 88, reverse diodes 89 - 92, power supply 93 sources of control signals 94 and 95. Between the collector of the tragzistor of each pin and the load, the first transistors that are silently installed are connected. 96-99, the base of which is connected through additionally installed consistently connected resistors 1OO-SW, the second transistors 104-107 and fixing diodes (zener diodes) 108- ill with the emitters of the transistor of opposite TRiJa conductivity, and the base of the second transistors 1O4-107 is connected through additional limiting resistors 112 - 115 with the load and collectors of the swinging erasing the same rack. Blinds of transistors - conduc- tions connected through 116 and 117 ropistors to the collectors of the bumper drivers of the p-pp - npono / in-m capacitance of the PCB1D diodes 1.1B - 121 diodes are designed to improve 1 / | -m (.1 n1 } 1pc hCTCf) on J To eliminate sensor shunt sensors (1O4 1O7 trilys). Install cut-off diodes 1.22. The resistors 123 are used to power the amplifiers arm sensors. ..S

The third collector transistors 124–127 of the opposite type of conductivity compared to transistors 81, 83, 85 and 87 can be installed with the collector of the composite transistor of each arm and the load, the third base is connected to the collector of the first additional transistor, which then selects a small one In the first place, and eichter of which can be connected to the emitter of transistors 31, 83, 85 and 87. In the case of applying a connection, indicated in FIG. 3 dotted line, cutting diodes 122 not / stav5 ts. ..y

Us1 (power unit works as follows.

Suppose that the composite transistors 8O, 81 and 86, 87 are closed, and the composite transistors 82, 83 and 84, 86 are turned on with the appropriate voltages of the sources 94 and. 95 control signals and the bases of transistors 97, 105, and 98, 106 are supplied with open polarity, therefore the latter are also in the on state. Transistors 96, 104 and 99, 1O7 are closed. A total voltage of source 93 is applied to load 88. When the polarity of the voltage sources 94, 95 of the control signals is changed, the composite transistors 82, 83 and 84, 85 remain for some time on due to the resorption of minority carriers in the base region, and the composite transistors 8O, 81 and 86, 87 are energized shorthair {) polarity. However, transistors 96, 1O4 and 99, 107 are closed, and only after the transistors 82, 83 and 84.85 are closed, is the opening polarity applied to the bases of transistors 96, 104 and 99, 107 and the transistors 97, 1O5 are turned on and 98 1O6 are closed at the same time as transistors 82, 83 and 84, 85. For the load 88, the total voltage of the power supply source 93 is applied and the current in the load changes in direction. When changing the polarity of the imprdasoni sources 94

And the 95 control signals are in the same position, the composite transistors 82, 83 and 84, 85 and the transistors 97, 105 and 98, 1О6 are turned out. On the transistors 96 - 99, coincidence circuits (AND circuits) are implemented, implementing logical multiplication. The transistor 1O4 - 1O7 implements a circuit for monitoring the state of the switching elements of the racks of the bridge power amplifier.

Thus, in the particular case of the proposed technical solution, the switching element of one rack is switched on, it is possible that the south is open only when another switching element of the same rack is open. This switching sequence of the transistors makes it possible to eliminate through-currents.

Claims (1)

Invention Formula A two-stroke thyristor power amplifier containing two output systors connected in series with respect to a source of alternating voltage and controlled from a source of antiphase signals, as well as signal thyristor optromes, in addition to the connections of output triacs, is an output of an amplifier, characterized in that In order to increase efficiency by reducing through-currents, each output of the source of anti-phaenic signal / sv is connected to the control input of the output triac of the corresponding arm through a sequence Flax-coupled optically controlled valve, control LED, signaling and prohibiting thyristor optocouplers, in each arm parallel to the output triac includes a control sensor, the output of which is connected to the control input of the prohibitive thyristor optocoupler of the opposite arm, while the mutational input of each optically controllable rentil is connected to the control LED of the opposite shoulder. Sources of information taken into account when exporting: land 1. Golts M. Ye. Automatized DC electric drives with a latitudinal and immobilized transduction (.ch1m. M, Energii, 1972, p. 30 (prototype),