SU773876A1 - Bridge-type transistorized inverter - Google Patents

Description

one

The invention relates to a T1 conversion technique and can find a name in automatics, electric amplifiers, tntany blocks and other devices that use bridge key amplifiers with pulse-width modulation.

Known bridge transistor inverter, made in the form of a two-stage amplifier with resistive connections, in which the transistors of the terminal cascade have the opposite type of conductivity, and the transistors of the preliminary cascade have the opposite type of conductivity of the terminal stage connected to them, between the combined bases two transistors of the preliminary cascade and the combined collectors of the two-transistors of the terminal cascade include resistors of the positive feedback Zi ll. Jq

However, a similar circuit works in a limited frequency range.

Also known as a train-resistor inverter, a generator with

an etching transformer, a power amplifier with an output transformer, and transistors, between the base and the number, to which the windings of the power 2 are included.

The disadvantage of this inverter is low CT.

The closest to this technical entity is a bridge transistor inverter containing in each circuit a power transistor whose COLL5KTOR is connected to one of the input pins, the emitter is connected to one of the output pins, and the base is connected to the current supply resistor and to the collector of the corresponding yii transistor that controls the electrode of which is connected to the pulse generator of the control.

The purpose of the invention is to expand the frequency range and increase the reliability of T1 operation by eliminating the through currents.

This goal is achieved by the fact that a capacitor is introduced into each of the device's devices, one electrode of which connects 1BN to one of the input degenerates, and the second to

.3773876 ... g

Claims (3)

To the other end of the current supply resistor, the positive feedback to the inverter also to the cathode of the newly inserted lead is created by the resistor 3.. When the bridging diode, the anode of which is connected to the base of the power transistor, besides between the collector of the ground transistor and the emitter of the power transistor, Also, between the output of the control generator and the base of the Tpatt triggering diodes, diodes are introduced. FIG. 1 is a schematic diagram of an inverter; FIG. 2 - time diagrams of his work. The bridge inverter contains decoupling diodes 1, 2, resistors 3, 4 that are co-active, power transistors 5, 6, feedback capacitors 7, 8; bias diodes 9, 10, control transistors 11, 12; diodes 13, 14 isolators and generator 15 control pulses. The bridge inverter works as follows. When the source is switched on; 1 and so on, the UE control input signal is missing, Utflavlesh and Uijnp are equipped with a high positive potential equal to 1. Diodes 13, 14 are directly connected. and the control transistors 11, 12 are in the saturable state, i.e. Loading 2.cogr through open power transistors 11, 12 and through diodes 9, 10 is connected to the case. The capacitors 7, 8 are charged up to the voltage of the power supply circuit: diodes 1, 2 - capacitors 7, 8 diodes 9, 10 transistors 11, 12. Transistors 5, b are closed by bias voltage of diodes C 9, 10. When the input signal at the output of the generator 15, arming pulses appear in antiphase, for example, E (Fig. 2). When Yutrpt signal is zero, diode 14 is closed and therefore transistor 11 is closed, ... transistor 5 is open; (it is passed by current flowing through resistor 3, and the datandial on the emitter of this ipansiacTopa becomes equal to the supply voltage Е {figure 2). Since capacitor 7 was already charged before the supply voltage, the voltage at point a becomes equal to twice the value of the supply voltage (Fig. 2) U Q, while diode 1 is closed by the reverse bias voltage. The time constant of the capacitor 7 and resistor 3 circuits is significantly greater than 1 horns, and during the closed state of transistor 5, the point-to-ten ratio changes the non-pickup resistor 11 to close, and transistor 5 begins to conduct a potential difference between the upper terminal of the resistor 3 and the transistor emitter 5 is kept equal to E. and the transistor 5 is controlled by the voltage of the capacitor 7, so that the potential at its base increases until the base-collector junction opens. After this, transistor 5 works. As an inverted switching transistor, which has a very small zero shift voltage, equal to the difference in the fall, the voltage of the BNB emitter and base-to-collector transitions. The current in the load circuit is closed along the circuit: transistor 5, ZHo, (- p diode 1O, transistor 12. When a positive signal Utjnpl appears, diode 14 and transistor 11 are opened, switching the base current of transistor 5 along the resistor 3 to itself, which causes pressure loss Closing the transistor, the eguum contributes to the voltage drop across the diode 9 due to the load current. opens, providing a capacitor 7 charge to a voltage source power supply. In the right way, the sequences described above for the left shoulder repeat, the load current changes its direction in reverse (Fig. 2Urfii III). Thus; the unlocking and locking of the inverter top key is completely determined by locking and unlocking the lower key. owls G - -. In the inverter, the possibility of the simultaneous presence of the power traces of the resistors in the open state is excluded even in the event of a malfunction in its control circuit. The invention The bridge transistor inverter, containing, in each arm, a power transistor, the collector of which is connected to one of the input terminals, the emitter of one of the output terminals, and the base is connected to the current contacting resistor and collector of the corresponding control transistor associated with a control pulse generator, characterized in that for the purpose of spreading the frequency range and increasing reliability, a capacitor is inserted into each of the arms of the device, one electrode KOTopotX) It is connected to one of the input pins, and the other to the other end of the current supply resistor, as well as to the cathode of the input dissociating diode, the anode of which is connected to the base of the power path & In addition, a diode is inserted between the collector 7 6 of the control transducer and the emitter of the power transistors, as well as between the output of the clock generator to the ooze of the control transistors. Sources of wives of the law taken into account during the examination 1. The author's certificate of the USSR I 306536, cl. H 02 W 7/537, 1971. 2. USSR author's certificate J 483749, cl. H O2 M 7/537, 1975. 3. Authors certificate of the USSR J 445107, CL N 02 M 7/537, 1974. v L