SU440666A1 - Switch Control Device - Google Patents

Description

one

The invention relates to automation devices and is intended for use in multi-channel switches.

In electronic switching devices, in the process of operation, it is necessary to carry out monitoring, especially for key elements.

Known devices for controlling a switch include key elements connected between the input and output buses.

In known devices, control circuit elements (resistors and diodes) are connected directly to the measuring circuit of each channel. Non-rotatable channels are connected to each other and to the switched on channel by the inverse resistance of the control circuit diode.

In the known devices, the switch is interrupted for the monitoring time (the common output of the measuring switches is turned off), and it cannot be used when switching different polarity signals. In addition, if the input signal circuits and the control circuit are not ground, the elements of the control circuit will degrade the switching accuracy of the input signals.

The purpose of the invention is to expand the functionality of the switch while monitoring its channels. To accomplish this goal, isolating capacitors, output and input transformers of a parallel resonant circuit and a high-frequency generator, the output of which is connected to the primary winding of the input transformer, are introduced into the switchboard circuit, and the secondary windings of the input transformer are connected to the input busbars and to one of the terminals of each key element The other outputs of which are connected to the output bus through a parallel resonant circuit, and through the primary winding of the output transformer and the isolating the capacitors are connected to the input busbars, while the secondary winding of the output transformer is connected to the comparison circuit.

FIG. 1 shows a block diagram of the device; in fig. 2 - time diagram.

The device for controlling switches contains input buses 1 1 -, powering capacitors 2, input transformer 3 with primary 4 and secondary - 5 g windings, high frequency generator 6, key elements n, output transformer 8 with primary 9 and secondary 10 windings parallel the resonant circuit 11, the output bus 12 and the comparison circuit 13, the output of the high frequency generator 6 is connected to the primary winding 4 of the input transformer 3, and the secondary windings -5 n of the input transformer 3 are connected to the input buses 1 1 - and to one From the terminals of each key element, the other terminals of which are connected to the output bus 12 through the parallel resonant circuit 11, and through the primary winding 9 of the output transformer 8 and decoupling, the capacitors are connected to the input buses 1 1 - 1 p; in this case, the secondary winding 10 of the output transformer 8 is connected to the comparison circuit 13.

At the time ti, a control signal is applied to the input bus 1 1 (see Fig. 2, a), as a result of which the contacts of the key element are closed (see Fig. 1), and to the primary winding 4 of the input transformer 3 enters (see Fig. 2, (3) high frequency voltage from generator 6.

A high-frequency signal (pulse or sinusoidal) is supplied to the control circuit with a spectrum that does not overlap the frequency spectrum of the output signal of the switch.

E. d. S., Induced in the secondary winding (see fig. 1) of the input transformer 3, through the closed contacts of the key element will be allocated on the primary winding 9 of the output transformer 8 and will be induced (see fig. 2, e) in the secondary winding 10 (see Fig. 1) of the same transformer.

Further, by known methods, the high frequency voltage can be comparable, for example, with the set voltage, and in the case of the normal operation of the channel key element, no fault signal is generated at the output of the known comparison circuit 13.

The voltage drop of the control signal on one of the secondary windings is 5 n of the input transformer 3 and the closed contacts of one of the keys. the tested channel will not have undesirable effects on external devices (for example, ADC), since the parallel resonant circuit with a slice, and Lpes. For a control signal, it represents a large resistance. At the same time, for switched signals, the resistance of the mentioned circuit is negligible.

The absence of elements of one-sided conduction and galvanic connection of the control circuits and measurement circuits allows commuting different-polar signals. In addition, the capacitors 2-1, by limiting the effect of the high-frequency control signal within the control circuit, ensure the operation of the device when the input signal and control circuits are ground, and in the presence of a common power bus.

At the time tz, the input bus control signal 1 1 is cleared by the first channel (see Fig. 2, a), then the contacts of the key element (see Fig. 1) are open, and the high frequency voltage on the secondary winding of the output transformer 8 is not induced . Let the control signal (see FIG. 2.6) start to flow at the same time to the input bus

 (channel 2). Assume that the key 7 2 (see FIG. 1) is faulty and its contacts do not close. Then the high-frequency voltage induced on the secondary winding of the input transformer 3 cannot stand out on the primary winding 9 of the output transformer 8, and the voltage on the secondary winding 10 of the same transformer will be zero (see Fig. 2, e).

A setpoint voltage, unbalanced, will generate a signal for contact failure (in this case, a key). At time 4, the control signal is removed (see FIG. 2.6) from the input bus

(by the second channel) and the control signal (see Fig. 2, c) starts to be received on the input bus 1 3 (the third channel). Suppose that the key 7 3 (see Fig. 1) is healthy and that its contacts are closed. Further, similarly

monitoring the first channel, the setpoint voltage is balanced by the high frequency voltage induced (see fig. 2, e) on the secondary winding 10 (see fig. 1) of the output transformer 8, and no fault signal is generated. At time 4, the control signal to the input bus (the third channel) stops (see Fig. 2.8) and the control signal to the input bus (the fourth channel) starts to flow (see Fig. 2, d).

Suppose that the key (see Fig. 1) is out of order, and its contacts are not open (stuck), and the key 7 4 is operational and its contacts are closed. Then the voltage of the high frequency of the primary winding 4 of the input transformer 3 will induce e. d. in two secondary windings of the same transformer. Through the primary winding 9 of the output transformer 8, the current of the two secondary windings 5 - 3 and 5 4 of the input transformer 3 will flow, resulting in an output winding of the secondary transformer 10 of the output transformer 8 (see Fig. 2, e) larger in amplitude e. D. s., than in the case of closure of the contacts of any one key. it

a high-frequency voltage, greater in amplitude than the set-point voltage, will cause a fault signal to close the contacts of the keys of the two channels (in this case, the third and fourth channels).

Subject invention

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Device for controlling the switch, containing, its key elements included

between input and output buses, which is connected with the fact that, in order to expand the functionality of the device, additional capacitors, input and output transformers, a parallel resonant circuit and a high-frequency generator, the output of which is connected to the primary winding of the input transformer, are added and the secondary windings of the input transformer are connected to the input buses and to one of the terminals of each

The key element, the other terminals of which are connected to the output bus through a parallel resonant circuit, and through the primary winding of the output transformer and isolating capacitors are connected to the input busbars, while the secondary winding of the output transformer is connected to the comparison circuit.

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