SU1495957A1 - Device for control of self-excited inverter - Google Patents

Abstract

The invention relates to electrical engineering and can be used in systems for controlling autonomous inverters. The purpose of the invention is to increase the reliability of the device and ensure the reverse media. The device comprises a master oscillator 1, a pulse distributor 2, a switch 3, a protection node 4, an AND 5 element, a signal-generating node 6, a delay element 7, and a block 8 of output amplifiers. The introduction of node 6 and switch 3 allows for a change in the order of alternating phases of the output voltage of the inverter, the coupling of element 5 with the enabling input of unit 8 will make it possible to increase the reliability of the device by shutting down the output stages during transients. The reliability of the device is also enhanced by the connection of the node 6 with the input of the element 5 through the delay node 7. 2 Il.

Description

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The invention relates to electrical engineering and can be used in systems for controlling autonomous inverters.

The purpose of the invention is to increase the reliability and ensure the reverse of the phases. FIG. 1 shows the functional scheme of the device; in fig. 2 - 1 diagrams explaining the operation of the device:

 The device contains a master generator 1, the output of which is connected to; the input of the distributor 2 pulses; made on the basis of six-phase; counter. The outputs of the distributor 2; connected to the corresponding inputs i of the first group of inputs of the switch 3,: and in order, reversing the I phases, to the inputs of the second group of inputs: switch 3. Node 4 protection connects: one of the inputs of the element 5 And, I other inputs connected to the i inverse output of the generator 1 and; to the node 6 of forming the reverse signal through the element 7 delay. The output of node 6 is connected to the control input of switch 3, the outputs of which are connected to the inputs of block 8 of output amplifiers, the resolution input of which is connected to the output of element 5 Switch 3 can be performed on multiplexers (Fig. 1), the control inputs of which connected to the output of node 6 directly and through the element NOT.

The device works as follows.

When power is applied to the nodes of the device, the master oscillator 1 starts operating. Pulses F from the receiving output are fed to the distributor 2, made on a six-phase counter, and from the inverse output (Fig. 2) are fed to the element 5, which is connected to the enabling input of block 8, This connection eliminates the false activation of the power devices of the autonomous inverter during transients in the device. From the outputs of the distributor 2 pulses with a duration of 180 e.grad. (Fig. 2 a, b, g, d, e) are received at the information inputs A and B of switch 3.

In the absence of a signal at the output of node 6, the outputs of switch 3 are connected to the inputs of group A. To provide phase reverser, node 6 generates a signal that switches the outputs

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the switch 3 from the group of inputs A to the group of inputs B. The outputs of the distributor 2 are connected to the group of inputs B so that the phase sequence of the signals. the control is reversed, the phasing of the inverter high voltages is also changed accordingly.

During operation of the converter to the load, the reverse should be carried out with a delay of time to restore the locking properties of the power devices and eliminate the emergency modes of the converter. This time delay is performed by element 7. When the signal level at the output of node 6 changes, element 7 transmits a signal to the first input of element 5 with a time delay. Node 4 is a threshold element that, when the permissible limit of the signal from the current sensor is exceeded, is set to prohibit the operation of block 8. Through element 5. And the information inputs of block 8 receive signals from switch 3, and the enabling input This block through element 5 receives pulses F, creating a clocked pause between inverter control pulses (Fig. 2 a, b, c, d, e, f), de-energizing the control circuit of power devices for the time required for their complete locking, excluding the through current at.

Thus, the connection of the generator through the element And with the authorizing input of the block of output amplifiers ensures reliable operation of the device and the inverter in transient conditions and simplifies the device. In addition, such a connection of nodes allows to exclude the passage of through currents through the power devices of an autonomous inverter; which increases its reliability, and the reverse node allows for alternating-phase alternation of the output voltage.

Claims (2)

1. A device for controlling an autonomous inverter, comprising a master oscillator, the direct output of which is connected to the input of the pulse distributor, the inverse output - with the first input of the element And, the second input of which is connected to the output of the delay element, and the block of output amplifiers whose outputs are outputs devices different In order to increase reliability and provide phase reversal, it is equipped with a reverse signal shaping unit and a switch, the pulse distributor is designed as a six-phase counter, the output of the reverse signal shaping node is connected to the input of the delay element and to the control input of the switch , the output of the element AND to the input of the resolution of the block of output amplifiers, the first to the sixth outputs of the pulse distributor are connected to the corresponding f the inputs of the first group of inputs of the switch and respectively from the fifth to the first and sixth inputs of the second group of inputs of the switch, the outputs of the switch are connected to the inputs of the block of output amplifiers. 2. The device according to claim 1, characterized in that, in order to increase reliability, it is provided with a protection unit, the input of which is intended to be connected to the inverter, and the output is connected to an additional third input of the element I. Editor M.Blanar Compiled by V. Mironov Tehred M. Khodanich Proofreader M. Maximilian 2