SU1228205A1 - Device for controlling transistor inverter - Google Patents

Abstract

The invention extends the control range of a device for controlling a transistor inverter. The device contains serially connected shaper 6 time intervals, counter 7 and logic unit 8. The outputs of block 8 are connected to control inputs of switches 1, 2, 3, 4 of the inverter, as well as to the inputs of controlled dividers 9 and 10. Output of divider 9 through integrator 1 1 is connected to a / 5 flip-flop, the output of which is connected to the reset key input 13 of the integrator 11 and the block 8 input. The possibility of simultaneously changing the division factors of dividers 9 and 10 allows you to generate a larger number of pulses, the average over the interval m deductions are proportional to the mean value of the sinusoidal voltage during this time, i.e., the quality of the output voltage improves and, with a constant number of pulses in the interval, expand the range of its regulation. 2 Il. (L 1CHE ND 00 to about ate

Description

The invention relates to electrical engineering, namely, converters of this voltage to alternating voltage, and can be used in an electric drive, for powering an automation and telemechanic device.

The aim of the invention is to expand the range of regulation of the output voltage of the converter.

Ma FIG. 1 shows a diagram of the device; in fig. 2 - time diagrams that show his work.

The inverter can be performed, for example, but the bridge circuit on diode-transistor switches, t-4, one, the diagonal of which is connected to the input source, and the other to the load 5. The device for controlling the inverter contains a series-connected driver 6 time intervals, counter 7 and logic block 8, four outputs of which are connected to the control inputs of switches 1 4 of the inverter, controlled dividers 9 and 10 voltages, the inputs of which are connected to the output of block 8. The output of the controlled divider 9 through the integrator 11 connect It is controlled to the input of the well block 12 with a / 5 flip-flop, the output of which is connected to the installed TR input m of the reset key 13 of the integrator I and to the input of the block 8.

The source 14 of the control voltage is connected to the second input of the unit 12 and controlled by the plug 10, the output of which is connected to the integrator 15. The output of the imager 16 is connected to the / - trigger input of the block 12.

For example, a single-junction transistor can be used as a threshold element of block 12. The imager 6 can be performed, for example, on the basis of the integrator 15 and the threshold element 16, the input of which is connected to the installation input of the integrator 15.

The device works as follows.

From the output of the divider 10 to the input of the integrator 15 of the former 6 enters the same1P1e

and t, (1)

where m is the division factor of the divider 10;

(Voo - - voltage across the output of source 14. At the same time, a voltage is formed at the output of the integrator 15 (Fig. 2).

When this voltage reaches the threshold value of the threshold element 16, the output of the threshold element 16, i.e., the output of the driver 6, is formed by an imp; 1e (Ye, the integrator 15 returns to its original state, after which the process is repeated.

The pulses Uf, are fed to the input of the counter 7 and / -input / 5-flip-flop of block 12.

At the beginning of each interval at the output of the 5-flip-flop, a pulse is formed, covering the key 13 of the integrator 11. At the same time, the output of the integrator 11 produces a voltage (Yc (integrated Oe).

0

five

0

0

five

0

five

The voltage: U is fed to the input of the threshold unit 12, which has a response threshold proportional to U- ,.

When the voltage at the input of the threshold unit 12 reaches the pane value of its trigger threshold, a pulse is generated at the input of the single junction transistor of the unit 12, which arrives at the 5th input of the trigger of the unit 12, as a result of which a voltage is generated at its output (Y | 9, which opens the key 13. In this case, the key 13 shunts the capacitor of the integrator 11 and the input of the threshold element of the block 12 until the end of the current modulation interval Γ ".

With the arrival of the next pulse from the throttler 6, the process is repeated. In this case, at the output of the most significant bit of the counter 7, the IMP; 1s of duration H / 2 is formed, arriving at the inputs of the AND-OR elements of block 8 and at its outputs. On the primary unit, 1 to 4 outputs of block 8 are connected, a voltage is generated, the voltage Q repeats at the output of the meter, and the second output is voltage U i, inverse U. At the outputs of block 8 that controls the keys 3 and 4, pulses from and UV are formed. Thus, the load 5 (Fig. 2) for a time / n is connected through the power stage keys to the input voltage source, and during the time (Hm - /) - shorted with the power stage keys. With constant Uy, Uf and when changing during the division factors t divider 10 and t-2 divider 9. by connecting different resistors of the second arm with the help of the decoder unit 8 so that their ratio changes sinusoidally, the average During the modulation period, the value of the output voltage pulses is proportional to the mean value of the sinusoidal voltage during this time. The possibility of simultaneously changing the coefficients m and m2, and, consequently, the durations of TV and / and allows you to get the minimum value of the impulse pattern for TV due to the simultaneous exchange / c and increase of 7m, and the maximum H and y of a 7m reduction, and form a larger number of pulses, the average for the interval. Modulations T whose value is proportional to the average value of the sinusoidal voltage during this time, i.e., improve the quality of the output voltage sov range and expand its range of adjustment.

The time intervals during which short pulses are formed on the output of the former 6 are used to create a zero pause at the transition. 1Injection of the key elements of the inverter, which allows you to eliminate through} 1st currents and increase efficiency

converter, without creating additional devices for the organization of such a pause. The use of the device allows to expand the range of adjustment of the input voltage of the converter, as well as to improve its spectral composition, reducing the level of side harmonics in the spectrum.

Claims (1)

Invention Formula A device for controlling a transistor inverter containing a source of control voltage, the output of which is connected to the first input of the threshold unit, the second input of which is connected to the output of the integrator with a reset key, the input of the integrator is connected to the output of the controlled input voltage divider, the output of the threshold unit connected to the reset key input of the integrator and the first inputs of the logic unit, the second, whose inputs are connected to the counter outputs, the first outputs of the logic unit are connected to the control inputs of the control unit Input voltage divider, the second outputs are designed to be connected to the inverter's transistors, a time interval shaper, the output of which is connected to the input Q 5 five The meter house, characterized in that, in order to expand the control range, it is equipped with a control divider of the control voltage, the logic unit is made on a decoder and two AND-OR-NOT elements, and the threshold unit is equipped with a / 5 trigger, and the source output the control voltage is connected to the input of the time interval shaper through a control divider of the control voltage, the control input of which is connected to the first input of the logic unit, which is the output of the decoder, the inputs of which are connected to you odes low bits meter rows, the second logic block outputs are the outputs of the AND-OR -NOT realizing functions ty, 3; t; 2 Q; About s Qt / V U, QU “V Qt / n, where Q is the output of the most significant bit of the counter; U "is the output of the threshold block, the inputs of the threshold block are the inputs of the threshold element, the output of which is connected to the S-input of the / 5-flip-flop, the / input of which is connected to the output of the time slot generator, and the outputs are the outputs of the threshold block.