SU1599981A1 - Commutator - Google Patents

Abstract

The invention relates to a pulse technique and can be used as a power semiconductor key or pulse generator in controllable electric drive and automation devices. The purpose of the invention is to increase reliability by timely disconnecting the main transistor switch. The switch contains the main and additional transistor switches, made on the input transistors 1-1, 1-2, power transistors 2-1, 2-2, collector resistors 3-1, 3-2, resistors 4-1, 4-2, 5 -1, 5-2, 6-1, 6-2, control bus 7, actuator, made on the relay 8 with two contact groups 9-1, 9-2 and the actuator key 10, trigger 11, zero body 12, a sensor 13, a load 14, a reset bus 15, and two power supply buses 16-1, 16-2. Due to the timely disconnection of the main transistor switch, if one of its component power transistors fails, one actuator is triggered with an additional transistor switch connected, which increases the reliability of the switch. 1 il.

Description

The invention relates to a pulse technique and can be used as a power semiconductor of a key switch or pulse shaper in devices of a controlled electric drive and automation.

The purpose of the invention is to increase reliability by timely switching off the jq main transistor switch.

The drawing shows an electrical diagram of the switch.

The device contains a primary and secondary transistor keys, and made on the input transistors

1.1, 1. £, power transistors 2.1,

2.2, collector resistors 3.1.

3.2, resistors 4.1, 4.2, 5.1, 5.2,

6.1, 6.2, control bus 7, executive device made on relay 8 with two contact groups 9.1, 9.2 and actuating key 10, trigger 11, null-element 12, sensor 13 (for example, current transformer), 25 load 14, initialization bus 15 and two buses 16.1,

16.2 power supply.

The first terminals of the transistor switch are connected to the second bus 16.2 of the power supply source jq, the second terminals of the transistor switch are respectively connected to the second contact group

9.2, the movable contacts of which through the load 14 are connected to the first bus

16.1 power supply.

The main transistor key to the collectors of the input transistor

1.1 and the second conclusions are connected to the inputs of the sensor 13, the OUTPUTS of which are connected via a zero-organ 12 to the single input of the trigger 11, to the zero input of which the installation bus 15 is connected to the initial state. The output of the trigger 11 through the actuator key 10 is connected to the coil of the relay 8 of the actuator. Bus 7 control through the contact group

9.1 is connected to the base circuits in axial condition and the load 14 is de-energized.

When applying a trigger pulse to the control bus 7 transistors

1.1 and 2.1 of the main transistor switch are unlocked and current flows through load 14.

In case of malfunctions such as an open or breakdown of one of the transitions of any of the transistors 2.1, 2.2, the amount of current flowing through the input transistor 1.1 increases. Using the sensor 13, you can switch to an additional key or disconnect a working key from the input and load in the event of a malfunction.

The sensor 13 in the form of a winding of a current or voltage transformer determines the response of the zero-organ 12. The threshold of the zero-organ 12 is determined depending on the task of analysis. Usually this is the number of malfunctions of the parallel circuits that can be allowed without disrupting the operation of the key as a whole.

Thus, in case of malfunction of the null-body 12, the trigger 11 is activated and is set to a single state,

Setting the trigger 11 to 1 ”determines the actuation of the actuator key 10, as a result of which the actuator is activated, the contact group of which switches the inputs of the transistor keys, and the second group switches their load or disconnects the faulty key from the inputs and load with the unreserved option (when there is no additional transistor key )

Thus, the proposed switch provides timely disconnection of the main transistor switch before it fails, which increases the reliability of the entire device.

Claims (1)

The claims of the new and additional transistor keys. The collector of the input transistor 1.2 of the additional key is connected by a jumper to its second output. The device operates as follows. In the initial state, the primary and secondary switches are locked on the base circuits, trigger 11 is located in the switch, containing the main transistor switch, made on the input transistor with a resistive divider in the base circuit, the emitter of which is connected to the bases of the power transistors and through the emitter resistor with the first output of the main transistor the key to which the power transformer emitters are connected 5 159998 tori, the collectors of which are connected through the corresponding collector resistors to the second output of the main transistor switch, bus to the power supply and control, the first of which is connected to the first load output, characterized in that, in order to increase reliability by timely disconnecting the main transistor switch, an additional transistor switch, similar to the main one, a sensor, a zero-organ, a trigger and an actuator with two contact bodies and pads, and the input terminals of the sensor are included dy input transistor collector terminal and a second main transistor switch, sensor output through zero-body connected to the trigger input unit 20, the zero input of which is connected to the bus resetting state, the output 1 6 of the trigger is connected to the input of the actuator, the movable contact of the first contact group of which is connected to the control bus, the opening contact is 1 to the base circuit of the input transistor of the main transistor key, the closing contact of the first contact group is to the base circuit of the input transistor of the additional transistor key, the first terminal of which is connected to the second bus of the power source and the first terminal of the main transistor switch, the collector of the input transistor is connected to the second terminal of the additional a transistor switch and a make contact of the second contact group, the make contact of which is connected to the second terminal of the main transistor switch, and the movable contact of the second contact group is connected to the second load terminal.