SU1420637A1 - Self-excited voltage inverter with protection unit - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is to increase the reliability and stability of the post-accident start of the inverter. In the event of an overload of the inverter, it rolls over. The emergency state sensor 15 generates a signal at the input of the protection unit 14, which triggers a one-shot 13, which generates a long signal at the other inputs of the elements OR 11, 12. Due to this, long-lasting control signals are received on all shoulders of the valve bridge 3. As a result of the on state of all the shoulders of the valve bridge, not only is the emergency current divided into all phases of the valve bridge 3, but also the full discharge of the capacitors of successive 1 C filters 6. This contributes to the reliable switching on of the inverter during automatic restart, since zero initial conditions are provided. 1 il. with S (/ s

Description

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The invention relates to the field of electrical engineering and can be applied in devices of autonomous inverters and devices for their protection.

The aim of the invention is to increase the reliability and stability of the post-accident start of the inverter.

The drawing shows a block diagram of an autonomous voltage inverter with a protection device.

Invetor contains a C-filter 1, the input is connected to the output of a source of direct current 2, valve bridge 3, each arm of which consists of a thyristor 4 and a counter-parallel-connected diode

In the event of an inverter overload, it overturns, the emergency state sensor generates a signal at the input of the protection unit 14, which triggers the one-shot 13, which generates a long signal at the other inputs of the OR 11, 12 elements, so that all the shoulders of the valve bridge 3 are continuously unlocking control signals. As a result of the on state of all arms of the valve bridge, not only is the emergency current divided into all phases of the valve bridge, but also a full discharge of capacitors of successive LC filters 6, which leads to reliable activation of the inverter during AR

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5, successive LC-filters 6 according to the number -15, since zero initial phases of the valve bridge are provided, with some conclusions of the switching condition.

Claims (1)

Invention Formula connected to the corresponding phase outputs of the valve bridge 3, other outputs; the receiving LC filters are connected to the load 7, the switching blocks 8 by the number of phases of the valve bridge, the corresponding power outputs connected to the input of the valve bridge and the corresponding phase outputs of the valve bridge, and These inputs are a self-contained voltage inverter with a protection block containing a HC-filter, the input is intended to be connected to a DC source, and the output through a current-limiting choke is Connected to the entrance of a valve bridge, each arm of which contains a thyristor and encounters mutations are connected via a corresponding 25 diode connected in parallel to it, blocking switching commutation control blocks 9 according to the number of phases of the switching number of switching units to the corresponding power terminals 10 primary sources connected to the input of the valve bridge and control pulses, the other outputs that correspond to the phase outputs of the fans are connected to one input of the elements "QJ-OST", the control inputs of the KOMILI 1 1 blocks 2 are connected to the corresponding the source outputs of the primary control pulses through the corresponding control units for switching by the number of phases of the valve bridge, the control blocks of the valve bridge by the number of arms of the valve bridge, the outputs connected to the control inputs of the thyristors of the respective arms OR 11, 2 according to the number of valves of my valve, the other inputs of which are combined and through the one-shot 13, are connected to the output of the protection unit 14, the input of which is connected to the output of the emergency state sensor 15, the outputs of the elements OR 11, 12 through the corresponding blocks 16, 17 control valve bridge by the number of elements OR connected to the control inputs of the thyristors of the respective shoulders of the valve bridge 3, and the current-limiting choke 18. A stand-alone voltage inverter with a protection device operates as follows. The constant voltage from the source is converted by the valve bridge 3 to the re-valve bridge, the inputs of the valve bridge control units are connected to the output, Q strokes of the corresponding elements OR according to the number of control units of the valve MOCTONI, one input of which is connected to the corresponding outputs of the source of the primary control pulses, the emergency sensor states, connected to the input of the block, exchanging and through successive LC-filters, 45 switchboards and successive HC-filters Lines 6 is supplied to load 7. The tuning frequency of the successive filters 6 is equal to the frequency of the output voltage. Switching off the shoulders of the valve bridge is carried out by switching units 8, the control signals to which are fed through the switching control units 9 and synchronized with the moments of the triggering signals on the switching-on successive shoulders of the valve bridge. 50 the number of phases of the valve bridge, some of the outputs of which are connected to the corresponding phase outputs of the valve bridge, their other conclusions are designed to be connected to the load, characterized in that, in order to increase the reliability and stability of the emergency launch, it is equipped with a single-oscillator; the one-shot is connected to the common inputs of the other inputs of the OR elements. In the event of an inverter overload, it overturns, the emergency state sensor generates a signal at the input of the protection unit 14, which triggers the one-shot 13, which generates a long signal at the other inputs of the OR 11, 12 elements, so that all the shoulders of the valve bridge 3 are continuously unlocking control signals. As a result of the on state of all arms of the valve bridge, not only is the emergency current divided into all phases of the valve bridge, but also a full discharge of capacitors of successive LC filters 6, which leads to reliable activation of the inverter during AR the valve bridge, the inputs of the valve bridge control units are connected to the outputs of the corresponding elements OR by the number of the valve control units MOCTONI, one inputs of which are connected to the corresponding outputs of the source of primary control pulses, an emergency state sensor connected to the input of the protection unit and consecutive HC filters for 0 the number of phases of the valve bridge, some of the outputs of which are connected to the corresponding phase outputs of the valve bridge, their other conclusions are designed to be connected to the load, characterized in that, in order to increase the reliability and stability of the emergency launch, it is equipped with a single-oscillator; the one-shot is connected to the common inputs of the other inputs of the OR elements.