SU842640A1 - Device for automatic checking of electric networks - Google Patents

Description

one

The invention relates to electrical measuring equipment and can be used for automatic control of products having a large number of electrical circuits, such as printed circuit boards, boards, cable trunks, etc.

A device is known that contains switching and decoupling relays connected to direct and feedback buses connected to the meter fl.

A disadvantage of the known device is low reliability.

The closest to the proposed technical entity is a device for automatic control of electrical circuits, containing a switch with switching modules made in the form of two series-connected switching elements, a meter, an open circuit control unit, a control unit, a software unit, address keys, a task unit stimulus and trigger switching tires G2.

The disadvantage of this device lies in the low speed.

The purpose of the invention is to increase speed.

The goal is achieved by the fact that the device contains a switch with switching modules made in the form of two serially connected switching elements connected between two output buses of the switch, the midpoints of each of which are connected to the inputs of the control object, each first control input connected with the output of each address key of both groups, and the second control inputs are combined together and connected to the housing, the control unit is connected to the control input through a programmable block ka.zhdogo address key both groups and ILIB specifying input stimulus, the second output controlling unit is connected to the inputs of flip-flop switching tires, both connected vyhodakotorogo

0 with the second inputs, respectively, of the first and second groups of address keys, the third output of the control unit is connected to the first input of the meter, the second input of which is connected to the second output bus of the switch, and the open circuit control unit, a pulse co-generator, a stimulus interrupter and a failure analyzer, and switching the modules are made in the form of mythic devices, and the open circuit control unit is made in the form of a code selector and amplitude discriminator, while the output of the code selector is connected to the first input m of amplitude discriminator, the second input of which is connected to the fourth WELLPHONE of the control unit, and the output is connected to the first input of the failure analyzer, the second input of which is connected to the output of the meter, and the output is connected to the input of the control unit, the fifth output of which is connected to the input of the , pulse code generator, the output of which is connected to the third inputs of all address keys, the first input of the stimulus breaker and the input of the code selector, two other inputs of which are connected to the output buses of the switch, the second input of the breaker From the mule connected to the output of the block, the stimulus is set, and the output is connected to the first output bus of the switch. The drawing shows a block diagram of the device. The device contains a commutator 1 switching modules 2 ,,. . .2 consisting of the co-mutation elements 3 and 3, respectively., 3 and the rear Za. , m 3, which contain matching transformers 4-, 4,. ..,, 4 and .ministor instruments 3, 5,. .,. , 5, respectively, and output buses 6 and 7, groups of address keys 8 and 9, respectively, containing address keys 8, 8.2. S and 9-1 Oe ,,. . . , 9 block break control unit, consisting of code selector 11 and amplitude discriminator 12, failure analysis torus 13, stimulus interrupter 14, stimulus assignment block 15, bus switching trigger 16, control meter 18, control block 18, program block 19 and impulse code generator 20 The device operates as follows. Upon a command from control block 18, software block 19 provides input to the program of the check and tolerances on the monitored parameters and decrypts the code of control operations: dialing, monitoring insulation resistance, monitoring electrical strength, etc. According to the results of decoding the operation code in block 15 of the task. test stimuli are generated; and that, through the stimulator interrupter 14, are sent to the output bus 6 of switch 1, the national bus 7 of switch 1 is connected to the meter 17, each of the monitored circuits (not shown) of the control object 21 using mythical instruments 5 ., 5, j ,. . can be connected to the output bus b or 7 of switch 1. Access to the corresponding output bus 6 or 7 of switch 1 is made by supplying a resolution of only the potential from the bus switching trigger 16, with its own signals associated with groups of address keys 8 and 9. The group of address keys 8 includes on the signal; llamas from the program of the second block 19 switching elements 3, 3 -j,. . , 3, connected to the output bus b, and the group of address keys 9 causes the switching elements 3, 3 ,, .. to work, connected to the output bus 7. Thus, for each address key 8, 8, j, . . ., 8 „, 9i, 9, ..., 9g, comes two enabling signals: bus selection and switching module selection. The switching module selection signal is generated based on the results of decoding the address of the monitored circuit in program block 19. Pulse code generator 20 generates two time-shifted pulse signals: polling and recording, normalized in duration and amplitude. These signals open selected from address keys b-, 8.2., ..., 8, 9. ,, 9 ,, ... affect the corresponding of the switching elements 3, 3h,. . . , 3) -,. The first pulse from the pulse coder 20 performs switching; corresponding of the switching elements 3 ,,, 3,. . ., Sn. Depending on which of the switching elements 3, 3 ...... 3f, is turned on, the monitored circuit is connected to the output bus 6 or 7. The stimulus breaker 14 is gated with signals from the pulse code generator 20, including the stimulating voltage at the switching points of the Switching elements 3, 3,. . ., 3v2vc The integrity of the communication link between the monitored circuits of the control object 21 and the switch 1 is performed at the time of switching of the particular monitored circuit. At the same time, on the output buses 6 and 7 of the switch 1, an emf is induced, having the form of a control signal. The code selector 11 selects the control of the signal against the background of various kinds of interference induced on the output buses 6 and 7 of the commutator 1. The selection is performed by temporarily gating the signal removed from the output buses 6 and 7 of the switch 1 by pulses from the pulse coder 20. The amplitude discriminator 12 produces comparing the polling pulse shifted with respect to the recording pulse with the threshold voltage coming from the control unit 18.

When the communication line is broken between the output of the corresponding switching modules 2, 2, ji ,, .., 2 and the controlled circuit in the control object 2, the signal from the interrogation pulse induced on the output buses b or .7 is insufficient to trigger the amplitude discriminator 12. Analyzer 13 failures are sent to the control unit 18 and then to the meter 17, the signal by closing the meter 17. In case of a positive result received from the amplitude discriminator 12, the meter 17 is connected to; the output bus 7 of the switch 1 and the measurement of the corresponding electrical parameter.

The use of the mythistor switching device in the switch allows to significantly increase the device speed by analyzing the integrity of the communication line by the control voltage at the time of switching the next circuit to be tested, i.e. the operations of monitoring the continuity of the communication line and the commutation of the circuit under test are combined in time.

The device can be used in high-speed switches, which ensure that the electrical parameters of products with a large number of electrical circuits to be monitored are checked, in particular for testing printed circuit boards, cables, etc.

Claims (2)

1. USSR author's certificate 5 568910, class G 01 ft 31/02, 1976. 2. USSR author's certificate number 550591, cl. G 0) R 27/16, 1975 (prototype).