SU834912A1 - Static switch - Google Patents

Description

(54) CONTACTLESS SWITCH

clock generator, element 2I-NOT, third element 2ILI-2I and summing-up and subtractive counters are entered, the output of the clock generator is connected to the second input of the first and the first input of the third element 2I, the output of the imaging device is connected to the first inputs of the elements 2I-HE and 2IL -2and with a different output for the turn-on of the power button, the inverse output of the first RS-flip-flop is connected to the second input of the 2ILI-2 elementIt the second input of the 2I-NO element is connected to the forward output of the first short-circuiting trigger, and its output is. to the installation inputs of the routing and subtracting counters, the counting inputs of which are connected to the outputs of the first and third elements 2I, respectively, and you-. moves - with the corresponding inputs of the second comparator, the output of which is connected to the third input of the element, the output of the latter is connected. to the single input of the second RS flip-flop, the zero input of which is connected to the output of the second element 2I, in addition, the output of the second RS-flip-flop is connected to the input of the amplifier and to the second input of the third element 2I, and the output of the first comparator is connected to the second input of the second element 2I .

The drawing shows the functional diagram of the contactless switch.

The device contains a driver 1, bus 2 AC, RS-triggers 3 and 4, the closing buttons 5 and 6, elements 7 and 8 2I, auditor 9, switch 10, load 11, current sensor 12, comparators 13 and 14, oscillator 15 clock pulses, element 16 2I-NOT, element 17 2I, element 18 2ILI-2I and counters 19 and

20.

The device works as follows.

in a way.

In the initial state at the direct output of the RS flip-flop 3, the signal has. zero level. This signal is fed to the input element 7 2Y, to the input element 8 2I and to the input element. 16 2I-NOT, providing at the output of elements 7 and 8 2I a zero signal, and at the output of the element 16 2I-NOT a single signal A single signal from the output of the element 16 2I-NOT goes to the installation inputs of the summing and subtracting counters 19 and 20 by writing to the summing the counter 19 has a zero code, and in the reading of the counter 20, a code corresponding to the number of clock pulses of the generator 15; per one half of 1). voltage source of alternating voltage; . current. At the same time, a single one is formed at the output of the comparator 14. | Zero signal from the output element

8 2I sets RS-trigger 4 to zero. Zero signals at the inputs of elements 7 and 17 2I prohibit the pulses from the generator to output 15 clock pulses to the counting input of the summing and subtracting counters 19 and 20. The zero signal at the input of the amplifier 9 ensures the switch is locked 10, with the result that the voltage on the non-linear load 11 is missing. A single signal from the inverse output of the RS flip-flop 3, coming through the element 18 2ILI-2I to the single input of the RS flip-flop 4, does not change the state of the latter.

Claims (2)

When button 5 is pressed, single-level RS-flip-flop 3 passes zero-level pulses generated at the output of shaper 1 at each zero-sinusoidal signal crossing a zero, the duration of which does not exceed the period of the clock pulses. The first of these pulses synchronizes the switching of the RS flip-flop 3 to one state. A single signal from the direct output of the RS flip-flop 3 permits the passage of pulses from the generator output of 15 clocks to the counting input of summing counter 19, and a zero signal. from the inverse output RS-triggerp 3 permits the passage of zero-level signals to the input of element 18 2ИЛИ-2И from the output of the feed rammer 1. These signals switch RS-flip-flop 4 to single state. A single signal from the output of RS flip-flop 4 permits the flow through the element 17 2I of the output from the generator output 15 clock pulses to the counting input of the subtractive counter 20, and also switches the switch 10 through the amplifier 9. In this case, the nonlinear load 11 is connected to the AC source at the moment when its voltage goes through zero. With an increase in the level of sinusoidal voltage in the circuit of a nonlinear load 11. a current, the magnitude of which is monitored by current sensor 12, is present. At the time of the current increase in. the nonlinear 11 exceeds the specified value, the comparator 13 is triggered, which switches to the zero state and sends to the zero state via element 8 2I RS flip-flop 4. In this case, amplifier 9 turns off the switch 10, relieves the voltage from the nonlinear load 11. After switching off the switch 10, the first comparator 13 returns to a single, state. At the same time. & TIMI a zero signal from the output of RS-Trigger 4 prohibits the arrival of pulses from the generator’s output of 15 clocks to the counting input of the subtractive counter 20, in which is fixed a code that carries information about a phase that is symmetrical about the center of a half period of sinusoidal voltage in which the switch 10 is turned off when the current sensor 12 is activated. The counting of impulses in the summing counter 19 is not prohibited and is accompanied by a gradual increase (8M of the code recorded in n, the value of l6 tjporo increases, c to the value of the code recorded in the subtracting counter 20. When the code in the summing counter 19 exceeds the value of - fixed in a subtractive counter 20, a comparator 14 is triggered, which switches to the zero state and resets it to one state via e (trigger 18 2ILI-2I RS-flip-flop 4, turning on the amplifier 9 again through switch 10, ° resulting in a non-linear load 11 A voltage pulse from an alternating current source is applied at the same time to the same period. Switching torus 10 is switched on again in the second half of the half-period when the sinusoidal voltage of the alternating current drops. To reduce this voltage to zero, the pulse from the output of the former is set to summing and subtracting counters 19 and 20 to the initial state and in the next half-period the switching process of the voltage of the non-linear load 11 is repeated Under the influence of the applied voltage The resistance of the nonlinear load increases, and with it the voltage phase also increases in the direction of increase, at which the comparator 13 operates. In this case, the supply voltage of the nonlinear load 11 has the form of pulses symmetrical with respect to the middle of each half-period and increasing with time both in amplitude, and in duration, which is accompanied by a further increase in the power supplied to the nonlinear load 11. This process is completed by outputting the nonlinear load 11 to the nominal supply voltage. When the button pressing device 6 is set in the initial state the supply voltage to the nonlinear load 11 is removed. . In the proposed device, the maximum voltage rise rate of the supply voltage of the nonlinear load is automatically set, which is ensured by controlling the switching transient, the nonlinear load in such a way that each non-linear load is connected to the alternating current source twice - in the first and second J half-periods , as a result, the power doubled increases to the non-linear load, i.e. The process of outputting a non-linear load to the nominal supply voltage is more intense. In addition, a symmetrical load on an alternating current source in a non-linear load transient causes a reduction in the effect of switching a non-linear load on the voltage form of an alternating current source, since the nonlinear distortions include higher harmonics, starting with the third harmonic. The invention is a contactless switch comprising a driver, the input of which is connected to. AC bus, two RS-flip-flops, the single input of the first of which is connected to the output of the closing power button, and the zero input through the closing power button to the zero, bus, two elements 2I, the first input of the first of which is connected to the forward output of the first RS -trigger and the first input of the second element 2I, amplifier, the output of which is connected to the input of the switch-. The torus is connected in series with the load and the current sensor to the AC source circuit, and two comparators, the input of the first of which is connected to the output of the current sensor, characterized in that, in order to increase the efficiency, a pulse generator, element 2I-NOT, the third element 2I, the element 2ILI-2I and summing and subtracting. Counters, the output of the clock generator is connected to the second INPUT of the first and the first input of the third element 2I, the output of the generator is connected to the first inputs 2I-NOT and 2IL-2I with another output of the pushing power button, the inverse output of the first RS flip-flop is connected to the second input of the 2ILI-g2I element, the second input of the 2I-NOT element is connected to the right output of the first RS-flip-flop, and the output - to the installation inputs of the summing and subtracting meters, the counting inputs of which are connected to the outputs of the first and three elements of the 2I, respectively, and the outputs - with the corresponding inputs of the second comparator, the output of which is connected to the third input of the 2IL-2I element, the output of the latter is connected toa single input of the second RS flip-flop, the zero input of which is connected to the output of the second element 2I, in addition, the output of the second RS flip-flop is connected to the input. the amplifier and to the second input of the third element 2I, and the output of the first comparator is connected to the second input of the second element 2I. Sources of information taken into account during examination 8349 128 1. Patent SZH1A, 3743861, cl. H 03 K 17/72, 07/03/73. 2. USSR author's certificate according to the application 2588121 / 18-21, cl. H 03 K 17/00, 03/07/78.