SU1383235A1 - Impulse noise simulator - Google Patents

Description

(21) 4125093 / 24-21 (22) 09/26/86 (46) 03/23/08/8. Bull. And (7l) Institute of Electrodynamics ... AN.USSR and the Special Design and Technological Bureau No. 1 of the Institute of Electrodynamics of the Academy of Sciences of the Ukrainian SSR C72) A.K. Shidlovsky,. V.A. Lizogub, V.F. Budenny and A.D. Muzychenko (53) 621.317.799 (088. 8) (56). Gurevich I.S. Computer protection from external interference. - 2 nd ed., - M .: Energ-. atomizdat, 1984, pp. 183-184. ... Devices and control systems. 1977 .. 1, p.26-27.

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(54) IMITATOR OF PULSED INTERFERENCE (57) The invention can be used for testing electronic equipment for susceptibility to short-term pulsed interference in a power network. The purpose of the invention is to increase the reliability of tests. The simulator contains a master oscillator 4, an adjustable power supply 6 and a shaping unit 7, including a galvanic isolation unit 10, keys 13–16. Introduction of a 1 series generator of pulses with a continuously varying frequency, counter 2, multiplexer 3, driver 5 single

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pulses and n - 1 formation units 7 allows to take into account the effect of resistive phenomena in the power supply circuits of the tested object and to improve the performance of the tests due to the possibility of simultaneous excitation of interference between all network conductors. In addition, the advantage.

The invention relates to a measurement technique and can be used for testing electronic equipment for susceptibility to short-term impulse noise in power cciTH,

The aim of the invention is to increase the reliability of the tests by taking into account the effect of resonant effects on the power of the test object and improving the performance of the tests to the possibility of one) - temporary excitation of interference between all networked devices.

FIG. Presented is a structural array of a pulse noise simulator} in FIG ,, 2, timing diagrams on Processes, for the sake of operation

The impulse noise attenuator consists of a series-connected pulse generator series 1 with a smoothly varying frequency, a counter 2 and a multiplexer 3 O, which also provides a single pulse forcing device 5, an adjustable power supply Hsoca 6, n forming units 7, n number branches in ... i tsepk ,. ,; .

The formation unit 7 contains resistors 8 and 9, blocks 10, 11 of galvanic isolation, capacitor 12, keys 13–16. The clock input of the driver 5 single pulses is connected to the output of the master oscillator 4, and the input of the generator of 5 single pulses is connected To the output of the generator of the first series of pulses with a smooth, but |) emfing frequency, the information input of the multiplexer 3 is connected to the output of the driver 5 with the single ycTpoftctBa signal forming the form of interference signals with a form that is close to real pulse interference in the circuits. Not changing the conditions for matching line segments at the point of attachment also increases the reliability of the tests. I zp , 2 Il.

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NIGHT pulses The outputs of the multiplexer 3 are connected to the information inputs of the formation blocks 7, the power inputs of which are connected in parallel and connected to the output of the regulated power supply 6. Resistors 8 and 9 are connected between the power inputs of the forming unit 7 and the electrodes of the condenser 12 in series with it, the inputs of the galvanic isolation units 10 and 11 are the information inputs of the formation unit 7, the control inputs of the keys 13 and

14 are connected to the outputs of the galvanic isolation unit 10, the control inputs of the keys 15 and J 6 are connected to the outputs of the electrical isolation unit 11, the first power outputs of the keys

13 and 16 are connected to the first electrode of the capacitor 12, and the first power terminals of the keys 14 and 15 are connected to the second electrode of the capacitor 12, the second power terminals of the keys 13 and

15 are connected to the first, output bus 17-1, and the second power terminals of the keys 4 and 16 are connected to the second output bus 18-1,,

The device works as follows

The test product is connected to the Power Network directly at the place of its further operation. After that, the network section connected to

the test article is connected through a low-pass filter to the rest of the network, the network section must,

to be maximally possible (Potential, Bus 17-1, 17-2 and 18-1, the simulator is connected to all conductors of the network section near the connection point to the low-pass filter and near the ends of all branches of the network section.

In the initial state (FIG. 2, then), the driving oscillator A produces pulses of calibrated duration (FIG. 2, a), which are fed to the clock input of the imaging unit 5 single pulses. The generator of a series of pulses with a smoothly varying pulse frequency at this moment does not produce and blocks the passage of a pulse series through the shaper 5 of single pulses. They do not enter multiplexer 3. Counter 2 maintains some arbitrary state. The regulated power supply 6 through the resistors 8 and 9 charges the capacitor 2 and it is then in the state charged to the voltage of the source 6. The keys 13-16 are closed and the output buses are disconnected from the capacitor 12. At the time T1 (Fig.2), the generator of the I pulse series begins to generate a sequence of pulses with a varying frequency, for example, with a decreasing frequency (Fig.2, b). These pulses are counted by counter 2 and sequentially switched over to multiplexer Z. During each of these pulses by the former of the single pulses, a pulse is generated that has a clock length. The multiplexer 3 distributes these pulses of the calibrated duration of the inputs of blocks 7-1, 7- 2 ,, .., 7-n formations (Fig. 2, c - 3). The forming units work in the same way, therefore, later, we consider the operation of one of them, for example, block 7-1. Suppose that at time T1 the input of block 10 of galvanic radiation comes from multiplex. litter 3 impulse. Block 10 opens the keys 13 and 14 and the capacitor 12 through the keys 13 and 14 is connected to the output buses 17-1 and 18-J. In this case, a pulse of the first polarity is formed on the output tires (Fig. 2, and). The capacitance of the capacitor 12 is chosen large enough to be discharged through the load slightly during the pulse. At time T2, the second impulse comes from multiplexer 3 through the block 11 for galvanic isolation of the keys 15 and 16.. l The keys lock and form into the keys.

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travel tires 17-1 and IB-I second polarity impulse. After that, the pulses from the outputs of the multiplexer 3 are received successively to the remaining formation blocks 74, which produce sign-alternating pulses with other phases, and then again to block 7-1, etc., until the series of pulses from the generator 1 has ended. capacitor 12 is charged through resistors 8 and 9.

Additional advantages of the device are the formation of interference signals with a form close to re-impulse noise in the circuits, unchanged conditions for matching line segments at the point of attachment, which also leads to an increase in the reliability of the tests.

Claims (1)

1. A pulse noise simulator containing a master oscillator, an rfCTO4Hinc adjustable power supply and a shaping unit, the first output of the regulated power supply connected to the first power input of the shaping unit, the first and second outputs of which are connected to the corresponding outputs of the simulator, aphid. that, in order to increase the reliability and performance of the tests, a pulse train generator with smoothly varying frequency, a counter, a multiplexer, a single pulse generator and an additional pulse generator were introduced into it GOVERNMENTAL forming blocks, the oscillator output pulse series with a continuously varying frequency is connected to the control input of the single pulse through the counter and - a controlled. .LYuG.G1M input of a multiplexer, whose information input is connected to the t output of a single pulse shaper, whose clock input is connected to the output of the master oscillator, the first power inputs n – J of the additional shaping units are connected to the first output of the adjustable power source, the second output of the coded power supply second, connected to the second power inputs of all the formation units, the first and second informational inputs of which are connected to the corresponding outputs of the multiplexer, and the outputs five . . 13832J The n-l pre-mode units are not connected to the corresponding outputs of the simulator. 2 "The simulator according to p. 2, and with the fact that the block is formed and the cortepmHt is the second and the second block of the galvanic isolation, the second is the second reenstor, the first is the fourth key and the capacitor The second power inputs of the unit are connected to each (through the first and second sources. with the first conclusions of the first 6 II of the second keys, a capacitor and the first views of the third and fourth keys and the second output of the capacitor, respectively, the second inputs of the first and third, and the second and fourth keys are connected to the first and second outputs of the block, respectively connected and corresponding to the first and second outputs of the first and second blocks of galvanic isolation.