SU1677771A1 - Pickup for indication of status of valves of converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used in control systems for valve converters. The purpose of the invention is to simplify the device. When the valves are open, both transistors of the nonlinear element 7 are closed, the output voltage of the element 7 also closes the corresponding Toisistor of the element 4, as a result of which the input voltage of the switching voltage generator 1 is at the input of the output body 3. If all controlled valves are closed, i.e. they have the voltage of any sign, opens one of the transistors of the nonlinear element 7, opens all the transistors of the element 4 and its output shunts the secondary winding of the transformer 2, which leads to a decrease in the voltage at the input of the selective organ 3 and the formation of a signal at its output . 1 il. eight

Description

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The invention relates to electrical engineering, in particular to converter technology, and can be used in control systems for valve converters.

The aim of the invention is to simplify the sensor state of the converter valves,

The drawing shows the scheme of the proposed sensor.

The sensor consists of a switching voltage generator 1, a transformer 2, an expansive organ 3, an element 4, which together are an electronic switch with galvanic isolation 5. The valve state control channels include limiting resistors 6.1-bt and non-linear elements 7.1-7g respectively. Controlled valves are connected through limiting resistors 6.1-6.gt to the inputs of non-linear elements 7.1-7.t, the outputs of which are connected to the inputs of element 4. The input of the supply rectifier 8 is connected to one of the group of controlled valves, and the output to non-linear elements 7.1 -7.t and element 4. The common point of connection of a group of valves is a common point for the supply rectifier 8 and the non-linear elements 7.1-7.t.

Each of the non-linear elements 7.1 to 7.t is made in the form of two transistors and two resistors, the junction point of the collectors of the transistors and the first terminal of the first resistor is the output of the non-linear element, the junction point

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the emitter of the first transistor, the base of the second and first terminals of the second resistor are the input of the nonlinear element, the second terminal of the second resistor is connected to the base of the first transistor, the emitter of the second and common point.

The sensor works as follows.

A controlled valve is considered closed if there is a voltage of any sign on it, modulo greater than a certain threshold. The value of this threshold determines the ratio of the resistances of the limiting resistor b, the second resistor of the nonlinear element 7, and the threshold for opening the transistors of this nonlinear element. The valve state sensor only works if all controlled valves are closed.

If the magnitude of the monitored voltage is less than the threshold, then both transistors of the nonlinear element are closed. At its output there is the potential of the output of the supplying rectifier 8, which closes the corresponding transistor of the element And 4. If the magnitude of the monitored voltage modulo more than the threshold, then one of the transistors of the nonlinear element opens, at its output there is the potential of a common point, which opens the corresponding transistor element and 4.

If the magnitude of all monitored voltages is greater than the threshold, then one of the transistors of all nonlinear elements 7 opens, all transistors of the AND 4 element open, the electronic switch 5 operates (its output transistor closes), which means the valve state sensor works.

If the magnitude of one or several monitored voltages is less than the threshold modulus, then one or more element 4 transistors are closed, the electronic key 5 (its output transistor is open) and the sensor as a whole do not work.

The electronic key is triggered if all the transistors of the element 4 are opened, and with their small internal resistance they shunt the secondary winding of the transformer 2, as a result of which the voltage of the switching generator 1

the voltage across the primary winding of the transformer 2 decreases and the output transistor of the selective organ 3 closes.

The power supplying line 8 can be performed, for example, as shown in the drawing, according to the well-known one-half-one rectifier circuit with a doubling of the voltage and its limiting by the zener diode (or its equivalent).

Claims (1)

Claims of the converter valve state sensor, containing a switching voltage source, the output of which is connected to the primary winding of the transformer, an selective organ and control channels, each of which includes a limiting resistor and a nonlinear element made in the form of two transistors, collectors which are connected to the output of the nonlinear element, and the emitter of the first transistor is connected to the base of the second transistor directly, and with its emitter - through the transistor A resistor, characterized in that, in order to simplify, a supply rectifier, an I element and each nonlinear element are inserted into the second resistor, and in each control channel the base of the first transistor of the nonlinear element is connected to the common bus of the device and the emitter of the second transistor, the base which is connected to the first pin of the limiting resistor, the second pin of which is intended to be connected to the corresponding controlled valve, the outputs of the nonlinear elements of all channels are connected to the corresponding input The I element and through the corresponding second resistors are connected to the output of the supply rectifier, whose input is intended to be connected to one of the monitored gates, and the element is made in the form of a circuit consisting of series-connected field-effect transistors according to the number of control channels connected to the secondary winding of the transformer The gates of the field effect transistors are the inputs of the element. And the input of the selective organ is connected to the primary winding of the transformer. d rwTl 2i F 2L {53-CIll j n g . - „J