DE2247336A1 - REMOTE CONTROL CIRCUIT FOR OPERATING ELECTRICAL SWITCHES - Google Patents

Description

8871-72 / Kö / s 2 2 A 7336

Convention Date:
September 27, 197 2

Andrew Francis Kay, Del Mar, California, V.St.A

Remote control circuit for operating electrical switches

The invention relates to a remote control circuit for operating electrical switches for relatively high voltages. she is particularly applicable to low voltage switching controls for domestic and commercial use, with the help of relative low voltages and currents, relatively high-voltage and / or high-amperage circuit arrangements can be controlled.

In the electrical industry, switching controls have so far been vej? applies, where by means of a low-voltage push-button switch a solenoid is energized, which is a switch in a relatively high-voltage circuit, for example for incandescent lamps in lighting circuits controls. Such Schaltungsar.ordnunfren usually consist of a low voltage source, for example a step-down transformer, one to the low voltage source connected solenoid or magnetic coil and one in series between the secondary winding of the step-down transformer and the Solenoid on push button switch. The solenoid actuates mechanically an ON-OFF switch in the circuit of the High voltage circuit.

Such arrangements have several obvious ones. Disadvantages mainly that when the push button switch is accidentally pressed and held in the pressed state current will flow through the solenoid coil, which may overheat or damage it.

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BAD ORIOINAt. "

The invention is based on the object of providing a remote control device to create that when closing the remote control push button switch generates a pulse to actuate the remote solenoid, but the solenoid is not continuously excited even if the push button switch ge remains closed.

A remote control circuit of the type mentioned is according to the invention characterized by an electronic switch in series with the high-voltage switch, which is only when applied with a control pulse of sufficient Size conducts the current from a high-voltage power source and thereby the high-voltage switch effectively with the current ^ source connects; by a relatively low-voltage control circuit with a control switch; and by a pulse generator which is in a given switching state Control switch applied to the electronic switch with only one control pulse of said size, while the control switch is held in this switching state.

Another disadvantage of the known remote control circuits is that the current in the remote control switch is one for actuation of the solenoid must be of sufficient size and tension. In contrast, with the device according to the invention on site the remote control with a much lower. Voltage and an extremely low current.

The invention is explained in detail below with reference to the drawing. Show it:

Figure 1 shows the circuit diagram of an embodiment of the invention Remote control circuit;

Figure 2 shows the current curve of the sinusoidal input alternating current the control circuit;

FIG. 3 shows the current curve at one point in the control circuit occurring distorted sinusoidal current;

FIG. 4 shows the pulse for / actuation of the Solenoids; and

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FIG. 5 shows the circuit diagram of a modified embodiment of the control circuit according to the invention.

In Figure 1 is the circuit of the high voltage circuit given by the two conductors 10 and 11. The ^ expression "high voltage" is to be understood relatively here, namely in contrast to the relatively low-voltage control circuits. At a Incandescent lamp circuit: for example, the high voltage is normally 110 volts.

The first control circuit includes a step-down transformer T-I, which is connected with its primary winding 12 via the conductors 10 and 11.

If it is desired to further reduce the voltage or power on the primary winding 12, a resistor can be used Provide 13 in series with the primary winding 12.

The step-down transformer TI has a secondary or output winding 15 with connections 16 and 17.In the output circuit of the transformer TI there are a normally open push-button switch 18, a rectifier 19, a capacitor 20 and an isolating transformer T-2 with its primary winding 21 and its connections 22 and 23. In parallel with the capacitor 20 and the isolating transformer T-2 there is a resistor 1 &,.

The connections 27 and 28 of the secondary winding 26 of the isolating transformer T-2 are connected to an electronic gate element or electric valve 30, for example in the form of a triac.

A solenoid or solenoid 31 is in series with the gate member 30 by means of conductors 32, 33 and 34 via the high voltage conductors 10 and 11 switched.

The solenoid 31 is mechanically connected to an electromechanical holder 3 5, preferably of the lever type ("'live! Schr.3 ter), so that with every impulse or every actuation of the solenoid 31 the switching mechanism bctäti gi and thereby the electrical supply ■ bond between the high-voltage line 10 and the '"switch

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aisle 36 is successively established or interrupted. The means of switch 3 5 energized or controlled electrical equipment, i.e. the consumer is switched via the connections or terminals 36 and 37.

When the control circuit is in operation, the connections 10 and 11 are subjected to an alternating current of relatively high voltage. This alternating current is sinusoidal, as shown in FIG. The resistor 13 fulfills the double task of maintaining the voltage on the Reduce primary winding 12 and distort the sinusoidal shape of the current so that the apex of the current waveform is pulse-shaped can be lifted out, as shown in FIG.

When the push button switch 18 is closed, the secondary circuit of the transformer T-I closed, so that the capacitor 20 by the half-wave pulses passing through the rectifier 19 being charged. During the charging of the capacitor 20, a current flows through the primary winding 21, through which in the Secondary winding 26 induces a series of pulses.

Since the first half-wave from the secondary winding 15 passes through the rectifier IQ, the capacitor 20 essentially charges completely, the first half-wave pulse in the secondary winding 26 generates a relatively large or strong one Impulse which is sufficient to switch the gate element 30 on or off to open. Because of the charged state of the capacitor 20, each additional half-wave pulse passing through the rectifier 19 results an increasingly smaller output pulse in the secondary winding 26, as shown in FIG.

When the gate member 30 is activated, the solenoid 31 becomes traversed by a current which is sufficient to switch the switch 35 to switch to the next switching state, i.e. either to close or to open.

As soon as the capacitor 20 is fully charged, it does not matter how long the switch 13 is kept closed, since no further significant current flows in the secondary winding 26 can, which is sufficient to the gate element 30 in the conductive

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To switch state so that no more current through the solenoid "31 flows.

When the switch 18 is opened, the capacitor 20 is discharged through the resistor 24. Resistance 24 is natural dimensioned so large that an excessively rapid discharge of the capacitor 20 is avoided.

The invention is explained here in its broadest scope as an electrical remote control device. It is mainly for the low-voltage control of lighting circuits and other facilities for domestic and industrial use The help of so-called pushbutton devices was thought. The scarf, ter 18 can therefore be designed as a push button switch or push button switch (push button switch) that when you touch or press the Magnetic switch (solenoid switch) 3 5 actuated. One of the known Key switch devices occurring main difficulties is avoided in the present control circuit by regardless of how long a user has closed switch 18 holds, there is no risk of the solenoid overheating.

Furthermore, with the present remote control circuit, it is possible to work with currents and voltages at the remote control location, the self versus the for the actuation of the electromechanical The voltage required by the switch are extremely small.

Fig. 5 shows a modified embodiment of the control circuit, the same parts in FIGS. 5 and 1 being denoted by the same reference numbers. Here, too, is a high voltage source in the form of conductors 10 and 11. *

In series across the high voltage conductors 10 and 11, a resistor 40 and a Zener diode 41 are connected so that the Zener diode a rectangular low voltage is generated. The series connection of a capacitor is parallel to the Zener diode 41 42, a resistor 43, a control switch 44 and a resistor 45.

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The capacitor 42 differentiates the square wave voltage from of the Zener diode 41 to sharp pulse spikes, e.g. 47, the respectively occur on the front and rear flanks of the rectangular tension.

A diode 49 is connected to the high voltage conductor via a resistor 40 10, via a resistor 50 to the collector 51 a transistor T-3 and via a capacitor 52 to the high voltage conductor 11 connected. The diode 49 »the resistor and the capacitor 52 form a half-wave operating voltage source for transistor T-3.

The capacitor 42 is connected to the base 55 of the transistor T-3 connected in series with a diode 56. The emitter of the transistor T-3 is connected to the high voltage conductor via a resistor 54 11 and via a diode 57 to the electronic gate element or the triac 30 connected.

The resistance limits the operation of this control circuit the voltage across the zener diode 41 to a desired low voltage value, and it becomes a. Square wave voltage generated from the through the cooperation of the capacitor 42 sharp spike pulses how 47 is generated on the leading and trailing edges of the square wave voltage will. The diode 49 »the resistor 50 and the capacitor 52 form a half-wave voltage source.

In the normal state, the capacitor 42 remains charged and no current flows until the resistors 43 and 45 by means of the

lllli.

Switch 44 are turned on. If the return path or Circuit with these resistors is closed, the transistor T-3 is controlled via the diode 56 by positive pulses.

When the transistor T-3 is driven into the conductive or on state, the capacitor 52 overdischarges the transistor T-3 »where most of the discharge current occurs with the first pulse. As long as switch 44 remains closed, no further charging of the capacitor 42 is possible.

When discharging through the transistor T-3 and the resistor 54

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a pulse is generated at this, which via the diode 57 to the Triac 30 is coupled so that the triac is controlled or switched into the conductive state.

■ Because the pulses are synchronous with the high voltage mains frequency are generated, the control or ignition pulse occurs at the triac 30 at the same time as the high voltage or mains voltage on the Anode of the triac increases. The triac 30 is in the conductive state for the duration of the half-wave of the feeding alternating current controlled so that the solenoid is operated, thereby turning the switch ON or OFF. The maximum pulse amplitude occurs when the capacitor 52 is discharged simultaneously with the first Pulse from transistor T-3 on. The time constant of resistor 50 and capacitor 52 is such that the capacitor 52 Do not charge yourself so far between the individual impulses can to keep the triac 30 constantly in the ignited state.

An electrical control circuit is described above, in which a relatively high voltage is controlled with the aid of a relatively low voltage and in the low voltage part a switch and a device responsive to the switch are provided which emit a low-voltage pulse when the switch is closed generated, whereby a switch provided in the high-voltage part is switched to the conductive state by the low-voltage pulse is switched. .

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Claims (7)

Claims Γ) V \ J Remote control circuit for operating electrical switches for relatively high voltages, characterized by an electronic switch (30) lying in series with the high-voltage switch (31, 35), which only supplies the current from a high-voltage switch when a control pulse of sufficient size is applied Current source (10, 11) conducts and thereby operatively connects the high-voltage switch to the current source; by a relatively low-voltage control circuit with a control switch (18; 44) J and by a pulse generator arrangement which, when the control switch is in a given switching state, applies only one control pulse of said size to the electronic switch while the control switch is held in this switching state. 2. Remote control circuit according to claim 1, characterized in that the high-voltage switch (31, 3 5) a circuit with successive actuations closes and interrupts. 3. Remote control circuit according to claim 1 or 2, characterized characterized in that the pulse generator arrangement generates the control pulse during a half cycle of an alternating current. ,1' 4. Remote control circuit according to claim 3, characterized in that the high-voltage switch (31, 35), the electronic switch (30) and the control circuit via the same high-voltage alternating current source (10, 11) are connected and that the control circuit is a Contains voltage reduction element (13) and a rectifier (IQ). 5 · Remote control circuit nactr one ^ er claims 2 to 4 # characterized in that the high-voltage switch (31, 35) is a magnetic switch (solenoid-operated lever or pawl switch). 309815/0776 6. Remote control circuit according to one of the preceding claims, - characterized in that die.Impulsgeberanordnung the electronic switch (30) with applied to a sequence of pulses, of which only the first has the said size. 7. Remote control circuit according to claim 1, characterized in that the pulse generator arrangement comprises a transistor (T-3) which supplies the pulses for the electronic switch (30) at its emitter, a circuit arrangement connected between the base of the transistor and the control switch (44) which makes the transistor conductive only when the control switch is in said one position, a capacitor (52) connected to the collector (5 ^) of the transistor, which is discharged when the transistor is made conductive, and one on The circuit arrangement connected to the capacitor, which only fully charges the capacitor when the transistor is non-conductive, contains (FIG. 5). '■: · - π τ 309815 / 077.6
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