SU1169120A1 - Versions of device for controlling voltage inferter - Google Patents

Abstract

1. A device for controlling an inverter voltage, containing a four-phase pulse generator, the outputs of which are connected to the first inputs of the four I elements, to the second inputs of which the output of the control key is connected, and the outputs of the first two I elements are intended for the working gates connected to the inputs, and the second two - to the inputs of the switching valves through the OR elements, characterized in that, in order to increase the speed, it is equipped with a pulse shaper, two ZI elements, an OR-NOT element and two delay blocks, to the inputs of which four-phase generator outputs are connected, the outputs of delay blocks are connected to the first inputs of the ZI elements, to the second inputs of which the output of the pulse generator, whose input is connected to the control key, is connected to the third inputs of the ZI elements, the output of the OR-NOT element, i the inputs of which are connected to the outputs of the second two elements And, and the outputs of the elements of the ZI are connected to the second inputs of the elements OR. Oh with jghbtk u

Description

2. A device for controlling a voltage inverter containing a four-phase pulse generator, the first two outputs of which are connected to the first inputs of the two elements I, the outputs of the latter connected to the trigger inputs of the RS flip-flops and through the first amplifiers are designed to be connected to the working valves, the outputs of the second amplifiers designed for connection to a switching valve,; m, the inputs of the second amplifiers are connected to the 1Н.1 moves of the other two elements I, the first iixo; ibi of which are connected to RS-flip-flops,

and their outputs are connected to the resetting inputs of the RS flip-flops, a control key connected by the output to the second inputs of the first AND elements, characterized in that, in order to increase speed, it is equipped with two OR elements and a pulse shaper, whose input is connected to the control key, and the output is connected to the first inputs of the OR elements, to the second inputs of which the second two outputs of the four-phase generator are connected, the outputs of the OR elements are connected to the second inputs of the second elements I.

This invention relates to electrical engineering and can be used in DC / DC converters.

The aim of the invention is to increase the speed.

FIG. 1 and 2 shows the device diagrams (options).

The power source 1 is connected to the load 2 through the working thyristors 3 with counter-parallel diodes 4. The switching thyristors 5 are connected between the poles of the source in series and their common output through the reactor 6 and the capacitor 7 is connected to the load output. These elements form a half-bridge inverter power circuit, which may differ slightly in the way that the switching elements 5-7 are connected. An inverter may have several phases.

The generator 8 is connected to the power supply unit 9, to the output of which the control key 10 is also connected, the outputs of which are connected to the And 11 elements in the passage channel of the working pulses and to the driver 12.

FIG. 1 outputs of the elements 11 are connected to the working thyristors 3. The working outputs of the generator 8 are also connected to the delay blocks 13, which, in turn, are connected to the elements 14 and the output of the elements 14 are connected to the second inputs of the elements 14 OR 15 is connected with control inputs of switching thyristors 5. The outputs of AND 16 are connected to the second inputs of the OR 15 elements, the outputs of which are connected to the OR-NOT element 17. The output of the latter is connected to the inputs of the elements OR 14. The inputs of the AND elements 16 are connected to the switch outputs of the generator 8 and the output key 10 of the control.

FIG. 2 outputs of the elements 11 are connected to thyristors 3 through amplifiers 18.

The outputs of the And 11 elements are connected to the trigger inputs of the RS-flip-flops 19, the outputs of which are under the scaffolding to the elements And 20 of the outputs of which are connected to the amplifiers 21 and the resetting inputs of the RS-flip-flops. Amplifiers 21 outputs are connected to the control inputs of the switching thyristors. The second inputs of the elements And 20 are connected to the outputs of the elements OR 22, the inputs of which are connected to the generator 8 and

0 shaper 12.

The device works as follows.

The inverter converts a constant voltage to a variable in a manner known per se. For this purpose, the thyristors 3 and 5 of the generator 8 are supplied with control pulses in a certain sequence. In this case, a control pulse to the switching thyristor is applied after the pulse to the corresponding working thyristor. Control pulses to the working thyristors pass through AND 11 elements only when the control key 10 is closed, which sends a signal from the power supply unit. When key 10 is off, these pulses do not pass.

g fig. 1, the pulses arrive at the working thyristors 3 directly from the elements 11, which also perform the function of galvanic isolation and amplification of the signal, and in FIG. 2, these functions are performed by amplifiers 18. Simultaneously with the resolution of the supply of working pulses, the key 10 permits the passage of switching pulses. In the device of FIG. 1, these pulses pass through elements AND 16, and then through elements OR 15. Elements 12, 13, 14, and 17 operate when the inverter is turned off. Wherein

always the last must follow the commuting impulses. If, after switching off the key 10, to wait for the corresponding switching pulse, then a delay occurs in the circuit equal to the half-cycle of the output frequency of the inverter. This effect is eliminated due to the fact that when the key 10 is turned off, the driver (such as a differentiating circuit) generates an additional switching pulse that arrives at AND 14 elements and triggers the one on which the delayed operating signal from generator 8 is present. the pulse (on appearance and disappearance) is the same and is several (2-3) microseconds. This is necessary to prevent the fronts from racing between elements 14 and 16. Passing this additional switching pulse is possible only if at this time there is no basic, which is achieved by blocking the elements OR-NOT 17 and element 14.

In the device of FIG. 2 each period, the working impulse triggers trigger 19, which permits the passage of commuting pulses through the elements () received from generator 8 through the lemo; you are OR 22. After passing the KOMMXTII pulse RS-flip-flop 19 reset: ;; ETSI signal output element 11 2i). The amplifiers 21 perform the same function as the amplifiers 13. When the key 10 is turned off, the operation of the pulses immediately stops, and the driver 12 will pulse the element OR 21 to e.yumoite AND 20. The pulse passes further only

that switching thyristor 5, COOTlkM

The operating valve 3 bm, which is connected with it, is switched on last, which is achieved without the RS-flip-flop 19. the remaining and the rst state.

Thus, due to the introduction of the thrashing generator 12 and other elements of the P) N, the devices provide the lic.io.i.ipn (without delay) cxrvi.i disconnection and thus a higher quality y ip; ii. .

.2

Claims (2)

1. A device for controlling a voltage inverter containing a four-phase pulse generator, the outputs of which are connected to the first inputs of the four elements And, the second inputs of which are connected to the output of the control key, and the outputs of the first two elements And are designed for directly connected to the inputs of the operating valves the second two - to the inputs of switching gates through OR elements, characterized in that, in order to increase speed, it is equipped with a pulse shaper, two ZI elements, an OR-HE element and two delays, to the inputs of which the outputs of the four-phase generator are connected, the outputs of the delay units are connected to the first inputs of the ZI elements, the second inputs of which are connected to the output of the pulse shaper, the input of which is connected to the control key, the output of the OR-NOT element is connected to the third inputs of the elements of the ZI, inputs which are connected to the outputs of the second two AND elements, and the outputs of the ZI elements are connected to the second inputs of the OR elements. 2. A device for controlling a voltage inverter containing a four-phase pulse generator, the first two outputs of which are connected to the first inputs of two And elements, the outputs of the latter are connected to the triggering inputs of RS triggers and through the first amplifiers are used to connect to operating valves, the outputs of the second amplifiers are designed to connections to switching gates, the inputs of the second amplifiers are connected to the outputs of the other two AND elements, the first inputs of which are connected to RS-triggers, and their outputs are connected to the reset inputs of RS-flip-flops, a control key connected to the second inputs of the first AND elements by an output, characterized in that, in order to improve performance, it is equipped with two OR elements and a pulse shaper, the input of which is connected to the control key, and the output is connected to the first inputs OR elements, to the second inputs of which the second two outputs of the four-phase generator are connected, the outputs of the OR elements are connected to the second inputs of the second elements I.