SU1456917A1 - Device for checking electronic circuit - Google Patents

Abstract

This invention relates to instrumentation technology. The purpose of the invention is to expand the functionality of the device. The device contains current sources 1 and 2, transistors 3-5, operational amplifiers 7 and 8, and resistors 9 and 10. The introduction of current control unit 11, which includes two comparators and a resistor, provides the ability to control the current consumed by a controlled electronic circuit output. 2 Il. (L 4 sa O) with figure 1 19 th 12 / J

Description

The invention relates to instrumentation technology and can be used to control electrical, circular circuits.

The purpose of the invention is to expand the functionality of the device by providing the possibility of a counter current consumed by a controlled output of an electronic circuit.

Figure 1 shows the functional diagram of the device; figure 2 - diagram of the control unit current.

The device contains the first 1 and second 2 current sources, the first 3, second 4, third 5 and fourth 6 transistors, first 7 and second 8 operational amplifiers, first 9 and second 10 resistors, current control unit 11, first 12, second 13, third 14, quarter 15, fifth of 16 and sixth. 17 inputs, the first 18, second 19 and third 20 ext.

The current control unit 11 comprises first 21 and second 22 comparators and a resistor 23.

The output of current source 1 is connected to the first terminals of transistors 3 and 5 and to the first input of operational amplifier 7, the second input of which is connected to input 14 of the device, and the output to the control output of transistor 3, the second output of which is connected to the first input of current control unit 11 , the first and second outputs of which are connected respectively to the outputs 19 and 20 of the device, inputs 15 and 16 of which are connected respectively to the second and third inputs of the current control unit 11, the fourth input of which is connected to the first output of the transistor 4, the second output to torogo connected to the output of the current source 2 and the first input operatsi- onnogo amplifier 8, a second input coupled to an input device 17, input 13 - to the control terminal of the transistor 6, a first terminal of which is connected with. the output of current source 2 2, and the second output through a resistor 10 with an output 18 of the device, input 12 of which is connected to the control output of the transistor. 5, the second output of which is connected via a resistor 9 to the output 18 of the device.

The first input of the current control block 11 is connected to the first inputs of the comparators 21 and 22 and through a resistor 23 with a common bus, the second input of the block 11

current control - with the second input of the comparator 21, the output of which is connected to the first output of the control unit 11

current, the third and fourth inputs of which are connected respectively to the second and first inputs of the comparator 22, the output of which is connected to the second output of the current control unit 11.

The device works as follows.

With the help of operational amplifiers 7, 8 and transistors 3 and 4, the first terminals of the latter maintain voltages equal to the upper and lower values of U and U of the setup voltage supplied respectively to the inputs 14 and 17 of the device. The output voltage of the device 18 supplied to the controllable output of the electronic circuit is equal to U or U. depending on the input of control signals to the inputs 12 and 13 of the device. Control signals arrive at

the control pins of transistors 5 and 6 open one of them. Moreover, if we ignore the input currents of the operational amplifiers 7 and 8 and transistors 3-6, the input current 1c of the controlled output of the electronic circuit and the current 1x of the control supplied to the current control unit 11 are related by

IK fuck

where I is the value of the flowing current & t

source 1 TOKaj 1 „- the value of the current flowing

Bbt, source 2 current.

The current supplied to the first and fourth inputs of the current control unit 11 is compared with the upper and lower values of I, and (, the adjusting current supplied respectively from the inputs

15 and 16 devices .. Comparison of currents in the current control unit 11 is as follows. Current 1 of control coming to the first and fourth of its inputs is converted

to the voltage across the resistor 23, which is further compared by the comparators 21 and 22 with the control boundary voltage levels proportional to the upper and lower values of 1, and

IP setting current. Here, the signals at the outputs of the current control unit 11 are determined by which of the following inequalities is fulfilled:,, IK 1, IK lo

Since the value of I

Tue

and

145691 Ifeb.T are known in advance and can be taken into account when setting I, and I- or set

in such a way that 1 is controlled by 1c, the device actually controls 1.

At outputs 19 and 20 of the device, the signals are determined by the inequalities

 BT

1out - 1yg

- 1, + I

wht tue

I,

- I

RT

Thus, the proposed device allows control of the current in the circuit of the monitored output in the mode of the voltage specified on this output.

Claims (1)

Invention Formula A device for controlling an electronic circuit containing a first current source, the output of which is connected to the first output of the first transistor and to the first input of the first operational amplifier, a second current source, which is connected to the first output of the second transistor and to the first input of the second operational amplifier. the control input of the device is connected to the control output of the third transistor, the first output of which is connected through the first resistor to the first output of the device 0 five five 0 7 The second control input of which is connected to the control terminal of the fourth transistor, the first output of which is connected through the second resistor to the output of the device, and the third and fourth inputs of the device, characterized in that, to expand its functionality, a current control unit is inserted into it, the first and second outputs of which are connected respectively to the second and third information outputs of the device, the third input of which is connected to the second input of the first operational amplifier, the output of which is connected to the control The first output transistor, the second output of which is connected to the first input of the current control unit, the second and third inputs of which are connected respectively to the fifth and sixth inputs of the device, the fourth input of which is connected to the second input of the second operational amplifier, the output of which is connected to the control output of the second transistor, the second output of which is connected to the fourth input of the current control unit, the output of the first current source is connected to the second output of the third transistor, the output of the second current source is connected to v The fourth pin of the fourth transistor. From 8x16 KSbixZQ