RU2546071C1 - Current flow control device - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: device includes the first and the second CMDS keys, a threshold element, a D-trigger, a diode, a current-setting resistor, the second power source, and an isolating diode.

EFFECT: improving operating reliability of a switching device.

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Description

The invention relates to the field of electronics and can be used in control systems of a rocket launcher, in control systems of an accelerating unit for controlling the passage of commands in switching circuits.

Known device for the flow of current "Element of comparison" (1), related to the pulse technique. It contains input buses, resistors, diodes, comparators, a P-N-P transistor and an N-P-N transistor. The device generates a total input signal, which is fed to the comparators, which allows you to work with bipolar signals and in the absence of signals provides new connections between the elements.

The closest method in essence and the achieved effect is a switch with a current flow control circuit (2).

This device contains the first and second KMDP keys, the first and second D-flip-flops, the And element, the inverter, the input bus, the output bus, the control bus, the voltage reference, the threshold element, the delay element.

Each KMDP key consists of parallel-connected MOS transistors of different types of conductivity and an additional inverter.

Monitoring the status of the output bus of the device occurs during the operation of the switch, which ensures an increase in its throughput.

To do this, a threshold element and a delay element are introduced into the switch, with the help of which information on the state of the output bus is recorded in the D-flip-flops at the moments after switching on and off the KMDP key used for control circuits, while the main KMDP key is turned on only after matches control information recorded in the D-flip-flops.

But this device is not reliable enough, because control is carried out upon the presence of voltage in the circuit. This does not allow checking the integrity of the circuits between the switch and the load, which is not reliable enough for management. Current control is more reliable.

Therefore, the objective of the invention is to create a device for monitoring the flow of current, increasing the reliability of the switching device.

The current flow control device is shown in the diagram.

The device comprises a first KMDP-key 1, a diode 2, a second KMDP-key 3, a threshold element with an inverse output 4, a D-flip-flop 5, a current-sensing resistor 6, a decoupling diode 7, a secondary power supply 8, an input positive bus 9, a control bus 10 , the output plus bus 11, the input negative bus 12, the output negative bus 13, the information output of the D-trigger 14, the clock input of the D-trigger 15.

The relationship between the elements of a technical solution should be constructed as follows.

The information inputs of the first KMDP key 1 and the second KMDP key 3 are combined and connected to the control bus 10, and the outputs are connected respectively to the output plus 11 and minus 13 buses of the device.

The input of the first KMDP key 1 is connected to the input plus bus 9.

The cathode of the diode 2 is connected to the input negative bus 12, and the anode to the input of the second KMDP key 3, to the first output of the current-setting resistor 6, to the first input of the threshold element with inverse output 4.

The output of the threshold element with inverse output 4 is connected to the information input of the D-trigger 5. At the clock input of the D-trigger 15, a clock frequency is supplied for recording information in the D-trigger. The output of the D-flip-flop 14 is the information output of the current flow control device.

The second input of the threshold element with an inverse output is connected to the input negative bus 12 and to the positive output of the secondary power supply 8. The negative output of the secondary power supply 8 is connected through the decoupling diode 7 to the second output of the lead-in resistor 6.

The device operates as follows.

Switching voltage is applied to the input (positive and negative) buses of the device.

In the initial state, in the absence of a signal from the control bus, the first and second KMDP keys are closed, the signal from the input bus does not go to the plus and minus output buses. The signal from the positive output of the secondary power source is fed to the second input of the threshold element with an inverse output and from the negative output of the secondary power source through the decoupling diode and a current-setting resistor is fed to the first input of the threshold element with an inverse output, there is no signal at the output of the threshold element with an inverse output, t .e. at the input of the D-trigger receives a logical "0". Using a threshold element with an inverse output, information on the state of the output buses at the moments after turning on and off the KMDP keys is recorded in the D-trigger.

When a single signal is received from the control bus to the inputs of the first and second KMDP keys, they open, and the signal from the input plus bus through the open first KMDP key goes to the output plus bus and through the diode, the open second KMDP key goes to the output minus bus of the device .

In parallel with the diode, a circuit is set that defines the response threshold, consisting of a threshold element with an inverse output, a current-sensing resistor, and a decoupling diode powered by a secondary power source, while the positive polarity of the secondary power source is connected to the negative polarity of the switching voltage supplied to the negative input bus.

A threshold element with an inverse output generates a single signal in the case when the amount of current flowing from the input negative bus through the diode and open KMDP keys is greater than the amount of current flowing through the second input of the threshold element with an inverse output, decoupling the diode and a current-setting resistor , i.e. a blocking potential equal to the voltage drop across the diode will be applied to the input of the threshold element with an inverse output.

A signal is present at the output of the threshold element with an inverse output, i.e. the input of the D-trigger receives a logical "1".

The current-sensing resistor sets the maximum permissible current of the threshold element with an inverse output. The parameters of the lead-in resistor are selected so that the maximum permissible current of the threshold element with an inverse output in the on state is minimal.

D-flip-flop is a trigger that fires on the leading edge of the clock signal, i.e. when it goes from zero to a unit level, it serves to store information about the state of the output buses when the device is turned on, for example, when a single signal is applied to the control bus or the device is turned off, i.e. when the control bus takes zero potential. In other words, with the help of these devices information about the state of the output buses is recorded in the D-trigger at the moments after switching on and off the KMDP keys, which are the output keys of the switch, and information about the status of the output buses is removed from the information output of the D-trigger.

A current flow control circuit is built into the switch, and current control is carried out before starting work and directly during operation of the device, which provides a more reliable operation circuit.

The current flow control device contains the first and second KMDP keys, the information inputs of which are combined and connected to the control bus, the outputs are connected respectively to the output positive and negative buses of the device, and the input of the first KMDP key is connected to the positive input bus, a threshold element, the output of which connected to the input of the D-flip-flop, to the clock input of which a clock frequency is supplied, and its output is the information output of the current flow control device.

In addition, a diode is introduced into it, the cathode of which is connected to the input negative bus, and the anode to the input of the second KMDP key, to the first output of the current-setting resistor and to the first input of the threshold element, the output of which is inverted, and the second input is connected to the input negative bus and with the positive output of the secondary power source, the negative output of which is connected through the decoupling diode to the second output of the current-setting resistor.

The technical result from the use of the proposed device is that the control of the state of the output bus of the device occurs during the operation of the switch, which provides an increase in reliability during control. Full diagnostics of the device’s operability is ensured by introducing direct control of the current flow through the output bus.

Information sources

1. USSR copyright certificate No. 1575306, priority 01/08/1988, H03K 19/00 (analogue).

2. USSR copyright certificate No. 1370763, priority 04/08/1986, H03K 17/00 (prototype).

Claims (1)

A current flow control device containing the first and second KMDP keys, the information inputs of which are combined and connected to the control bus, the outputs are connected respectively to the output plus and minus buses of the device, and the input of the first KMDP key is connected to the positive input bus, threshold element, output which is connected to the information input of the D-flip-flop, to the clock input of which a clock frequency is supplied, and its output is the information output of the current flow control device, characterized in that a diode, the cathode of which is connected to the input negative bus, and the anode to the input of the second KMDP key, to the first output of the current-setting resistor and to the first input of the threshold element, the output of which is inverted, and the second input is connected to the input negative bus and with the positive output of the secondary a power source, the negative terminal of which is connected through a decoupling diode to the second terminal of the lead-in resistor.