SU1368869A1 - D.c.-to-a.c. voltage self-checking stabilized static converter - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to devices for converting and stabilizing electrical energy parameters. The purpose of the invention is to increase reliability by improving self-control. The master oscillator (short pulse generator) opens with its every pulse the first transistor of an inserted switching transistor unit having two or four transistors (depending on the DC amplifier circuit in the stabilizer), whose collectors are connected to the bases of subsequent transistors and through whose collector-emitter transitions are connected to the common wire of the linear stabilizer element (reference voltage source, feedback voltage divider, etc.), having this connection in classical congestion directly. Due to the operating currents of these elements through the transistors of the indicated block, the generator pulses approach the base of the transistor of the dc amplifier of the stabilizer and its response to them appears at the output of the linear regulator separated from the rest of the circuit by a DC filter. When the device is working properly, pulses are output from the output circuit of its linear stabilizer, synchronizing the counting trigger, which excites the MOTORNESS amplifier connected through the transformer to the consumer. The voltage at the output of the device is present as a positive result of the automatic check of all its elements. 2 hp ft-l, 2 ill. i (L with O) 00 00 Od

Description

The invention relates to electrical engineering, in particular, to devices for converting and stabilizing electrical energy parameters.

The purpose of the invention is to increase reliability by improving self-control.

Fig. 1 is a diagram of a self-monitoring stabilized DC / AC converter with a single-transistor DC amplifier; Fig. 2 is the same with a differential in the presence of a reference voltage divider.

The self-controlled stabilized static DC / AC converter contains a linear stabilizer 1, which includes an output capacitor 2, a control transistor 3 and a diode 4 connected in series between the terminals for connecting the network and the capacitor 2, as well as the comparison unit 5, which includes a divider 6 feedback, a reference voltage source 7, a DC amplifier 8 with a resistor 9, a transistor 10 (FIG. 1), or two transistors 10 and 11 (FIG. 2) using a differential cxet-Qji, and in the latter case the comparison unit includes a divider 12, a reference voltage, and a DC amplifier 13, a resistor; block 1A of switching transistors with two (fig, 1) 15 and 16, or four (figure 2 16, 15, 17 and 18 transistors, a generator 19 short pulses, connected via a transient circuit 20 to the base-emitter junction of transistor 15; power amplifier 21, power leads connected to output capacitor 2; output, transformer 22, primary winding connected to output of power amplifier 21, and secondary winding to terminals for connecting the load; power amplifier control unit 23 (trigger with counting input), which output . Mustache to muster 21 numerator power; shaper 24 start pulse input is connected to the common point of the transistor 3 and a diode 4, and the output node to the input of the power amplifier 23 ynpaiuneHiiH.

The collector of the transistor 10 (output of the DC amplifier) is connected to the base of the transistor 3. The inputs of the feedback 6 and the source / 6

the reference voltage is connected to the capacitor 2. The output of the divider 6 is connected to the base of the transistor 10. The output of the source of the reference voltage in the circuit of figure 1 is connected to the emitter of the transistor 10, and in the circuit of figure 2 to the input of the divider 12 of the reference voltage, output connected to the base of the transistor 1 1. Divider 6 feedback. and the source 7 of the reference voltage in the circuits of FIGS. 1 and 2, as well as the divider 12 of the reference voltage and the resistor 13 in the circuit of FIG. 2 are connected

to (common stabilizer bus through collector-emitter transitions, respectively, of transistors 15-18 of switching transistors block 14 of the base of transistor 16 in the circuit in FIG.

connected to the collector of the transistor 15, and the bases of transistors 16, 18 and 17 are connected to the collectors of transistors 18, 17 and 15, respectively.

Output power node 23 control

(trigger with counting input) in this particular case of execution is connected to the output of the reference voltage source.

In the case of performing a DC amplifier with a single-transistor device, it works as follows (Fig. 1).

five

0

five

In the interval between the pulses of the generator 19, the transistor 16 is open. The current of its base and collector is the current of the source 7 of the reference voltage and the feedback divider 6. In this period of time, the linear stabilizer 1 operates according to the usual classical scheme. During the pulse of the generator 19, the transistor 15 opens, but the transistor 16 closes, since the voltage drop of the saturated transistor is always less than the base-emitter voltage of the transistor of the same type. The current of the source 7 of the reference voltage during the presence of the pulse of the generator 19 is not interrupted, but changes its path - flows at this time through the junction of the collector - emitter of the transistor 15. The feedback divider 6 current, on the contrary, is interrupted) d At this time, transistor 10 goes out of line mode and becomes saturated. The voltage at the emitter of transistor 3 acquires a failure and from the driver 24 trigger pulses (in this case

3

a specific implementation - a resistive divider) will receive a sync pulse for trigger 23, overturning it. This comes from each pulse of the generator 19 if the linear stabilizer is fully functional and these pulses reach the input of the node 23 (trigger). Any failures: breaks and closures of the conclusions of each element or transitions of transistors make it impossible to pass pulses through a linear stabilizer.

If there is no current through the transistor 10 (break of one, two or all three pins of the emitter, the collector base or shorting the base-emitter transition), this leads to a loss of the amplifying properties of the transistor, therefore the generator 19 pulses brought to the base of the transistor 10 ( through a divider 6 connected to the collector of the transistor 16) will not cause a change in the voltage on the collector of the transistor 10, and thus the voltage on the emitter of the transistor 3.

If one of the outputs of the Zener diode and the source 7 of the reference voltage breaks between the pulses of the generator 19 at the emitter of the transistor 10, the voltage will become greater than at its base (due to divider 6), and during the pulse between the base and the emitter be zero. The transistor will be permanently closed.

In the event of a break in the leads of the splitter resistors 6, the connection is lost, the splitter with the output of the stabilizer, which leads to the locking of the transistor and the connection with the collector of the transistor 16 leads to its permanently open state.

In the circuit with a differential DC amplifier (Fig. 2), an additional transistor 11, a divider 12 of the reference voltage, a resistor 13 are subject to control. In the case of one of the terminals of the transistor 11 operating in the normal state as an emitter follower, the voltage on it load (resistor 13) decreases and the voltage at the emitter of transistor 3 also decreases, having taken the value of the lower level of the pulses taken from here to the driver 24 in the absence of faults. If a fault occurs in the form of a base-emitter transition closure,

ten,

s

ten

15

20

2

with with

68869 1

the same result was obtained, since the klk due to the bypassing of the output of the divider 12 by resistor 13, the voltage on the latter decreases by no less than an order of magnitude. The closure of the collector-emitter junction of transistor 11 doesn’t, on the contrary, permanently close the transistor 10, regardless of the pulses arriving at its base from the feedback divider 6. The absence of breaks in the splitter resistors 12 and resistor 13 is checked by the presence of the base currents of the transistors, respectively 18 (during the existence of the generator pulse 19) and 16 (in the interval between the pulses), since in a good stabilizer each such pulse causes the opening of the transistors 15 and 18 and, conversely, the locking of the transistors 17 and 16). The currents of the source 7 of the reference voltage, its

divider 12 and resistor 13 are not interru

They do, but only change their way - either through base-emitter transitions of transistors 17, 18 and 16, or through collector-emitter transitions of transistors 15, 17 and 18. The presence of ET1HX currents through the bases of transistors 17, 18 and 16 and the transistors 15 , 17 and 18 interrupt them, which allows to bring the pulses of the generator 19 from the input to the output of the block 14 of switching transistors and further to the base of the transistor 10, since the last (along the pulse path) transistor 16 of this block is locked during the pulse. The feedback divider 6 opens at this time 40 ° of the common stabilizer bus, and the transistor 10, as previously described} with the 1st stabilizer with one transistor in the DC amplifier, switches from linear mode to saturation state g. Further processes will take place as described above.

Thus, the self-controlled stabilized static converter of the constant voltage gg to variable has the output voltage only when its elements are in good condition. Any fault

thirty

55

such as an open circuit or a closure entails stopping the operation. Dealing with a malfunction, the issuance of an unnormalized voltage is excluded, and the presence of an output voltage of op-signifi- cant go with a TV in good condition.

Claims (3)

1. Self-controlled stabilized static DC / AC converter that contains a power amplifier, an output transformer connected to it, a power amplifier control unit made on a trigger, a linear DC regulator with a control transistor, a diode, an output capacitor and a node Comparison, in which there is a voltage source, a feedback divider and a DC amplifier connected to the indicated divider and a source about voltage, and output - with a regulating transistor base, a short pulse generator and a starting pulse shaper, the output connected to the input of the control unit of the power amplifier, and the input to the common point of the regulating transistor and a diode connected in series between the input and output pins, the power amplifier is connected to the output pins, characterized in that, in order to increase reliability by improving self-control, a block with an even number of five Q 0 five 0 transistors, with the emitters of all transistors connected to a common length, the base-emitter junction of the first transistor is connected to the output of the short pulse generator, the base of each subsequent transistor is connected to the previous collector, and the reference voltage source and the reference divider of the reference node are connected to a common bus through the collector-emitter, ternary circuit, respectively, the first and last transistors. 2. The converter according to claim 1, in T is characterized in that the DC amplifier is made on one transistor, and the block of switching transistors consists of two transistors. 3. The converter according to claim 1, T is characterized by the fact that the DC amplifier is made according to a differential circuit, and a reference voltage divider is introduced into the source voltage, and the switching transistor unit consists of four transistors - emitter circuits of the second and third of which are connected to the common busbar, respectively, the reference divider and the emitter resistor of the dc amplifier. and FIG. 2