SU736355A1 - Single-channel device for control of multi-phase power-diode converter - Google Patents

Description

a multiphase valve converter containing a synchronization unit connected to a generator of linearly varying voltage, n sources of constant voltage connected via n keys, an adder, a comparator with direct and inverse outputs, the second input of which is connected to

a control signal source, and a reverse shift register with summing and subtracting inputs, equipped with an additional key, a multivibrator with direct and inverse outputs, two AND logic elements, an OR logic element, and a linearly varying voltage generator connected to an adder through an additional key, the control circuit of which is connected to the inverse output of the multivibrator, the direct output of the multivibrator and the outputs of the register are connected to the control circuits of the main keys a logical block, direct outputs of the comparator and the multivibrator through the first AND logical element are connected to the register subtractive input, and the inverse outputs through the second logical element AND and the logical element OR to the summing input of the register, the second input of the logical element OR is connected with the output of the block sync

FIG. 1 shows a block diagram of the device in FIG. 2 timing diagrams explaining the operation of the device.

For definiteness, the block diagram of the device in FIG. 1 is presented for a six-byte transducer for pulse ogame (t 6), with n 3, where n is the number of keys.

The synchronization unit i is connected to the generator 2 of a linearly varying voltage. The sources 3, 4, and 5 of the constant voltage are connected via keys 6, 7 and respectively to the adder 9. The latter is connected to the comparator 10, to the second input of which the control signal source 11 is connected. The generator 2 is connected to the adder 9 via Additional cam 12, and the reversing shift register 13 and multivibrator 14 through logic block 15 with control keys 6, 7 and 8, Comparator outputs through logic elements AND 16 and 17 to logic element OR 18 are connected to the input of the reverse register. 3 In the timing diagram 1U (Fig. 2, the network voltage diag. 20 represents the output voltage of the generator 2 linearly varying voltage, diag. 1a 21, the output voltage g of the ultrasonic vibrator 14, diagram 22 indicates the closure of CTs 6, 7 and a (numbers of closed keys are indicated), and diagram 23 is the closed position of key 12. Diagram 24 shows the input voltages of the comparator 10. Diagram 25 shows the control pulses of the valve converter.

The device works as follows.

In the proposed device, the search for the DC voltage level does not occur at the network frequency, but at the high frequency specified by the operation of the multivibrator 14 (this frequency is several orders of magnitude higher than the network frequency) The device operates at high frequency when the logical 1 is on the inverse output of the multivibrator 14, when the key 12 is closed, the comparator 10 compares the magnitude of the linearly varying, control and one of the direct voltage and, if they are equal, generates a control pulse. At a logic zero on the inverse output of the multivibrator 14, the key 12 is disconnected, and the output pulses of the comparator 10 are not transmitted to the control circuit of the power valves of the circuit, this way the circuit works is used to search for the DC voltage of 3.4 and 5 using one of the keys 6 -eight.

Let us consider in more detail the processes in time diagrams.

Let the register be in the extreme position corresponding to the minimum control angles and key 6 is closed, i.e., the source voltage 3 is applied to the comparator's input. The value of the control signal, on the contrary, corresponds to large values of the control angles. In the nepBOMjTaKte operation (the "multi-vibrator 14 (time interval tg - t) is compared on the voltage comparator of the adder 9 and the source 11, the control impulse is not generated. At the time t. The multivibrator switches and starts the second cycle of operation. Key

12 is opened by a command from the multivibrator and at the output of the adder Y there is only a signal of source 3. This level corresponds to the maximum steering angle that can be formed when source 3 and key 6 are working. But even this level does not trigger the comparator 10. The unit at the inverse of the comparator and the unit at the output of the multivibrator 14 is transmitted through the logic elements 17 and 1b to the register and causes it to switch at time t. The key is six times, the key 7 is closed at the output of the adder 9, the voltage corresponds to the maximum control angle that can be formed when the source 4 and the key 7 are working. But this level does not trigger the comparator 10. The signals at the input of logic elements 17, 18 and

13 does not change the register remains in the same position until the end of the cycle of operation of the multivibrator (time t).

At time tj, the key 12 again closes, but the comparator does not process, because the steering angle is beyond the limits that can be achieved with the source 4. At time t, an even tact of the multivibrator 14 comes again. The key again opens 12. The unit at the inverse output of the comparator 10 causes the next switching of the register 13. This time, at the output of the adder 9, the potential of the source 5, nprf whose operation forms the control angles; -from 4L / hp to LK / t. The comparator works. At the output of the logic element 18, the logic zero register does not change its state. The search is over. The switching of the comparator on the even cycle of operation of the multivibrator is not transmitted to the control circuit of the valves, since the logic element is locked. 16. At time t, an odd cycle of operation of the multivibrator begins, at which a comparison of linear, constant and control voltages takes place. After alternating a series of even and odd clock cycles, one of the odd clock cycles produces a control pulse removed from the output of the logic element 16; This pulse causes a shift in the register.

When searching for a DC voltage level, when the initial state of the register corresponds to larger control angles than the level of the control signal is required, in an odd tact of the multivibrator, a control pulse is immediately generated, causing a switch of the register. When the register is switched, the source of constant voltage is switched (instead of key 8, key 7 is turned on). If a control impulse is formed again in this case, the switching continues further in the direction of decreasing control angles, so that in the end the search ends. Since this stage of switching occurs very quickly (the switching speed is on the order of microseconds), the introduction of low inertia into the control pulse generation nodes ensures that control pulses are generated only at the gates corresponding to the end of the search.

The application of the present invention improves reliability and speed and allows its use in reversible converters and direct frequency converters with separate control with one L phase shifting unit for both valve groups.

Claims (3)

1. USSR author's certificate number 547962, cl. I 02 P 13/16, 1975. 2. USSR author's certificate number 191681, cl. And 02 M 1/04, 1964. 3. USSR author's certificate 0  586539, class And 02 R 13/16, 1976 (prototype). Phi.1 ill, iГ  i  I i i - -tt-L .-- 1.II --V-4--4t- -in- -YC o 4 2 VS I  g 7 -J.e