SU1185357A1 - Device for simulating thyristor-diode group - Google Patents

Description

The invention relates to elements of computing technology and can be used in modeling and research on analog computing "machines of various electronic 5 objects containing thyristor-diode groups.

The purpose of the invention is to increase the accuracy of modeling.

The drawing shows the structural scheme of the proposed device.

The device contains an operational amplifier 1, a feedback feedback resistor 2, a first switch 3, a first and second scale resistor, 5 ry 4 and 5, a second switch 6, a third scale resistor 7, the first comparator 8, a two-input logic element OR 9, a control source voltage 10, trigger 11, the second comp-20 rator 12.

The device works as follows.

The input signal and _{ah is} proportional. thyristor-diode voltage 25

group, and the output signal and _{bb | x is} proportional to the current through the thyristorodiod group

Consider the operation of the device in the absence of a control signal.

-If there is a positive signal at the input of the device at the output of the comparator 8, "1" appears. At the output of the element OR 9, “1” also appears and at the output of I of the trigger 11 appears “1”, and at the exit of II - “0”. Therefore, the key 6 will be closed, and the key 3 is open. The transfer ratio of the operational amplifier 1 opreKg. 40

divided by the ratio K = ––––– and at K γ and K £

appropriate choice K. ₅ / <K ₇ ,

K _? “K ₂ reaches a large value, which models the open state of a 45 antiparallel diode connected in the forward direction. When the analogue of the current passes through zero, the output of the comparator 12 will appear "1", which will cause the trigger 11'50 to switch to the opposite state, i.e. At output I of trigger 11, a “0” appears, and at output I - “1.” Thus, key 6 will open and key 3 closes. The transfer ratio 55 of amplifier 1 will become small, which simulates the closed state of an anti-parallel diode.

With a negative input signal at the output of the comparator 8 appears "0". When a control pulse of positive polarity arrives from block 10 at input 2 of the element OR 9, a positive impulse appears at the input I of trigger 11 and the trigger 11 switches. At its output I, "1" appears, and at output II - "0", i.e. key 6 closes and key 3 opens. The gain of amplifier 1 will become large, which simulates the open state of an anti-parallel thyristor connected in opposite to the diode.

When the current analogue passes through the "0" from the positive to negative area. dutory, which corresponds to the shutdown of the simulated thyristor, the output of the comparator 12 appears "0", which does not trigger the trigger 11. The keys 3 and 6 remain in the same position, the gain of the operational amplifier remains large, which simulates the open state of the antiparallel diode.

When the current analogue passes through "0" from the negative to the positive region, which corresponds to switching off the diode model, the output of comparator 12 will appear "G, trigger 11 will switch, key 6 will be open, and key 3 will be closed, which will reduce the gain of the operational amplifier 1. In the absence of control pulses from the output of block 10 in this case, the closed state of the diode and thyristor is simulated.

Thus, with an appropriate choice of resistance resistors 2, 4, 5 and 7, you can adjust the slope of the characteristics of the characteristics of the simulating diode-thyristor groups. In this case, the angle of inclination of the characteristic can be brought closer to the characteristic of a real thyristor-diode group, which increases the accuracy of the simulation.

In the particular case, when it is required to simulate only the current-voltage characteristic of the diode, the element OR 9 and the control voltage source 1P can be excluded from the device by connecting the output paraparator directly with the first trigger input 11.

1 185357

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Claims (1)

A DEVICE FOR MODELING A THYRISTOR-DIODE GROUP containing a control voltage source, a large-scale feedback resistor and an operational amplifier whose output is a device output, a large-scale feedback resistor is connected between the output and the input of the operational amplifier, characterized in that in order to increase accuracy, it contains the first and second comparators, the first and second keys, the first, second and third large-scale resistors, a trigger and an OR element, whose two inputs are connected respectively to the output of the first comparator and to the output of the control voltage source, and the output is connected to the first input of the trigger connected to the second input to the output of the second comparator, the first switch and the first scale resistor are connected in series and connected in parallel with the feedback scale resistor, the second switch and the second scale resistor are connected in series and connected in parallel with the third scaling resistor between the input of the operational amplifier and an input device that is connected to the input of the first comparator, a second comparator input connected to the output of the operational amplifier, the control inputs of the first and second keys are respectively connected to first and second flip-flop outputs. 00 SP From £ SP 1185357 2