CH615772A5 - Arrangement for remote-controlled, wireless transmission of a variable control parameter - Google Patents

Description

The invention relates to an arrangement for the remote-controlled, wireless transmission of a variable control variable for an electrical device of a receiving point from a transmitting point by means of a control command with different frequencies.

In the known methods for transmitting a variable control variable, pulse width modulation is preferably used. A control command with a certain frequency is assigned to the control variable at the sending point. The value of the control variable is determined by the ratio of the pulse to the pause time of a predetermined pulse sequence clock. The pause time can be filled in with a control command of a different frequency for safe transmission and easier evaluation at the receiving point. At the receiving point, the value for the control variable is then derived from the pulse width ratio of the two control commands.

With this method, the control command or commands must be sent continuously. At the receiving station, the control variable transmitted in this way is evaluated by counting the pulse and / or the pause time with the aid of a clock generator, which delivers a fixed counting clock. However, the evaluation can also be carried out by integrating the control command or the control commands over time. If the value of the control variable is changed, the pulse-pause ratio is changed in one direction or the other at the sending point, for which purpose adjustable time elements are required. At the receiving point, the receiving and evaluating devices must adapt to the new pulse-pause ratio and ignore the previously determined value of the control variable, since the pulse-pause ratio is directly proportional to the value of the control variable. This adjustment makes it difficult to count the pulse-pause ratio, since the evaluation result has to be determined anew at each period of the control command or the control commands and must be corrected accordingly. The evaluation becomes easier if an integration of the control command or the control commands is selected. However, this presupposes a constant transmission of the control command or the control commands.

There are now cases of remote-controlled, wireless transmission in which it is sufficient not to change a control variable continuously, but to transmit it only in a few stages. In this context, reference is made to an air bubble massage device in which the speed of the blower motor in the control device should be able to be changed in a limited number of steps from the bathtub using a hand control device.

It is an object of the invention to design an arrangement of the type mentioned at the outset in such a way that the transmission of the value of the control variable and the change of this value of the control variable are made possible with simple circuits, the control commands sent by the transmitting station only having to be transmitted for a short time.

This is achieved according to the invention in that two control commands with different frequencies are provided on the sending point for the control variable, that one control command sent with the first frequency denotes an enlargement and the other control command with the second frequency denotes a reduction in the control variable, that during the pending control command with the help of a clock generator with a fixed switching cycle switching pulses

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or switch-back pulses for a stepping forward and backward adjustable digital-analog converter of the receiving point can be derived and that the analog output signal of the digital-analog converter represents the value of the control variable. By assigning the two control commands to a control variable, it is achieved that the storing digital-to-analog converter of the receiving point can be optionally switched forward and backward. Each pulse of the pending control command brings about a defined increase or decrease in the value of the control variable. After the control command has ended, the last value of the control variable is retained via the digital-to-analog converter of the receiving point. The change in the control variable depends on the duration of the control command, since this duration is converted by the fixed switching clock of the clock generator into a proportional number of pulses for advancing the digital-analog converter.

For the transmission of the control command, it is provided according to one embodiment that the control command can be transmitted at the sending point by means of a switch button, the contact of which sets a transmitting generator to the assigned frequency, and that the control command can be screened out at the receiving point and fed to a switching logic, which, depending on the presence of one or the other control command with the pulses of a clock at the receiving point, switches the digital-to-analog converter on or down. The conversion of the control command into the advance pulses for the digital-to-analog converter takes place at the receiving point.

The design of the new arrangement can, however, also be carried out in such a way that the control command can be initiated at the sending point by means of a switch button, the contact of which adjusts a transmitting generator to the assigned frequency, that the control command with the impulses of a clock of the sending point as Pulse sequence can be emitted with a predetermined pulse repetition frequency, and that on the receiving point the pulses of the screened control command directly switch the digital-analog converter on or down. The conversion of the control command into the stepping pulses for the digital-to-analog converter takes place at the sending point.

The structure and control of the digital-to-analog converter are such that it contains a switching counter with a predetermined number of counting positions, that each counting position is assigned an equally large change in amplitude of the analog output signal, that the switching counter is between a zero position and an end position in any counting position can be set and that this setting of the switching counter can be carried out via a common control input by means of pulses of different polarity in the forward and reverse directions. The derivation of the correct polarity of the switching pulses for the digital-to-analog converter is achieved when using the clock generator at the receiving point in that the switching logic, depending on the presence of one or the other control command, applies the pulses of the clock generator in one or the other polarity forwards the switching counter of the digital-to-analog converter so that it can be switched in the forward or reverse direction. If the clock generator is arranged at the sending point, this derivation takes place in such a way that the impulses of the control command sifted out at the receiving point via a non-clock-controlled switching logic in the assigned polarity can be forwarded directly to the switching counter of the digital-to-analog converter, so that this is forward - or reverse direction is switchable.

If the clock is arranged at the sending point, there is a simple possibility to monitor the value of the control variable which is effective in the receiving point at the sending point. It is intended that the impulses

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of the transmitted control command can be fed to a control counter of the sending point and that this control counter can be switched forward via the pulses of one control command and switched back via the pulses of the other control command. The control counter is designed with the same number of counting positions as the switching counter of Digital-to-analog converter of the receiving point. This control counter then always contains the value of the control variable as soon as it is pending at the receiving point. For reading the control counter, it is provided that the counting position of the control counter can be displayed via a decoder and a digital display device and that this decoder and this digital display device can only be connected to supply voltage via contacts of the switch buttons during the transmission of a control command. This connection of the decoder and the digital display device ensures that the change in the control variable can be observed in any case via the digital display device.

If the electrical device of the receiving point is a motor operated by the mains voltage and its speed is to be changed, then this can be controlled directly via the control variable if it is provided that the analog output signal of the digital-analog converter and a mains Synchronizer signal in the form of mains-synchronous sawtooth voltages can be fed to a phase shifter, which by comparison derives the ignition pulses for a phase control of the motor, that two further control commands are available at the sending point, via which a switch-on and a switch-off command can be transmitted to the receiving point and that on the The receiving point controls the screened control commands a bistable switching amplifier with switching relay, whereby the switching relay takes over the switching on and off of the electrical device, as well as the resetting of the digital-analog converter to the zero position. At the beginning, the manipulated variable is therefore always set to the value zero t.

The switch-on of the electrical device can be limited at the same time to a predefinable switch-on time. For this purpose, the arrangement is designed in such a way that when the switch-on control command is sent, a switching relay that characterizes the switch-on state and switches the transmitting devices to the supply voltage can be excited and switched into a holding circuit, so that a time counter can also be set to a counter reading that specifies the switch-on duration in time units. that the time counter can be reset with a reset clock corresponding to the time units, that when the time counter is reset to zero via a zero position control circuit and a switch-off device, a switch-off control command that characterizes the switch-off can be sent automatically and the switch-off circuit holding circuit is delayed by a switch-off delay device it can be initiated that the counter setting the duty cycle is provided in an initial time value circuit, which is designed as an assignor, and that this The counter reading can be transferred to the time counter when the switch-on control command is sent. The switch-on duration specified in the time counter is paid off in such a way that the transmitter's clock generator is connected to the control inputs of the time counter via a counter control circuit, that this counter control circuit can be controlled via the stable initial position of a time selection switch in such a way that the reset clock of the clock generator can be fed to the reset input of the time counter is or can be fed to the control input of the time counter in such a way that it is reset, that the time selector switch has two self-triggering working positions, in which the counter control circuit can be controlled so that the fixed switching clock of the clock for the duration of maintaining the working position switches the time counter faster or switches back and that the counter reading of the time counter can be displayed via the decoder and the digital display device for the control counter of the control variable

The dual use of the decoder and digital display device is achieved in that the decoder and the digital display device can be switched off by the control counter for the control variable and connected to a time counter via a query button and via the working positions of the time selector switch, as well as can be connected to supply voltage.

The invention is explained in more detail with reference to the drawings, for example.

1 is a block diagram of the sending point according to a first embodiment,

2 is a block diagram of the receiving point with the clock for controlling the digital-to-analog converter for the control variable,

Fig. 3 is a diagram that explains the derivation of the ignition pulses for a phase control from the output signal of the digital-to-analog converter and

Fig. 4 in the block diagram of the sending point according to a second embodiment with the clock and devices for specifying a time-limited and changeable duty cycle for the electrical device of the receiving point.

The arrangement for wireless transmission of a variable control variable for an electrical device is shown in FIGS. 1 and 2, the sending point in FIG. 1 and the receiving point in FIG. 2 being shown in the block diagram.

The transmission generator SG can be set to four different frequencies f 1 to f4 using the switching buttons TI to T4. The downstream transmitter S emits the infrared waves at the frequency determined by the actuated switch button. The control command with the frequency f3 is sent when the switch key T3 is pressed. At the receiving point, the receiver E receives the infrared wave with the frequency f3. The amplitude control stage AR regulates the level fluctuations and delivers a constant output signal that is independent of the wireless transmission path with its different attenuation. The filter F3 sifts out this switch-on control command and switches on the switching relay A via the bistable switching amplifier SV. With the contact a1 the motor M is switched on to the AC voltage 220 V ~ and with the contact a2 the digital-to-analog converter DAW is set to its zero position. The control command with the frequency f4, which is transmitted when the switch key T4 is actuated, serves as a switch-off control command, which resets the switching amplifier SV via the filter F4 at the receiving point and switches off the motor M with its motor control MSt.

If the switch-on control command is given, the transmitter devices are switched on. The control buttons T1 and T2 can then be used to send two control commands to identify the control variable for the electrical device at the receiving point. In the exemplary embodiment, the speed of the motor M is to be changed. The control command with the frequency f 1 denotes an increase and the control command with the frequency f2 a decrease in the control variable. When the control command is sent with the frequency fl, an infrared wave with the frequency fl is emitted for the duration of the actuation of the switch button T1. This control command is screened out at the receiving point via the filter F1 and reaches the switching logic SL via the level shaper PF1, which is controlled by the clock generator TGe in the switching clock t2. As long as the switching logic SL is controlled via the level shaper PF1, the pulses of the clock generator TGe pass with the switching clock t2 from 1 Hz to the forward and backward adjustable digital-to-analog converter DAW, in such a way that each pulse is a switching counter in the Digital-to-analog converter DAW advances from the zero position by one count towards the end position For a sufficient

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Control of the motor M is sufficient for a few counting positions. In the exemplary embodiment, nine count positions are selected. The number of pulses that change the switching counter of the digital-to-analog converter DAW is determined by the duration of the key press. If the switch button T1 is pressed for nine seconds, the digital-to-analog converter DAW is set in its end position and remains in this end position, even if further impulses are supplied by the switching logic SL. However, if the switch button T2 is actuated, then the switching logic SL is controlled at the receiving point via the filter F2 and the level shaper PF2. The pulses from the clock generator TGe are now fed to the switching counter of the digital-to-analog converter DAW in such a way that it is adjusted in the direction of the zero position. If this zero position is reached, the digital-to-analog converter DAW maintains this zero position, even if further impulses arrive. The switching counter can only be adjusted in the direction of its end position again with pulses that are derived via the control command with the frequency f 1. With the two control commands, which can be sent via the switch buttons T1 and T2, the digital-to-analog converter DAW can be set to any desired counting position, the control command determining the direction of the change in the counting position and the size of the change by the duration of the transmitted Control command is determined.

The digital-to-analog converter DAW emits an analog output signal which increases or decreases by a predetermined amplitude value from count position to count position depending on the direction of advance. The output signal of the digital-to-analog converter DAW is fed to a phase shifter PS together with a synchronization signal which is formed via a power supply unit NT and a network synchronization unit NS. This phase shifter PS delivers ignition pulses for the phase control MSt of the motor M via the isolating stage TS, which, for. B. may contain a thyristor.

The count position of the digital-to-analog converter DAW remains even after the control command f 1 or f2 has been switched off, so that the set value of the control variable remains effective. In the present exemplary embodiment, this means that the motor M continues to run at the assigned speed. The final switch-off takes place via the control command with the frequency f4, the digital-to-analog converter DAW also being reset to its zero position.

3 shows the diagram; in the first part the analog output signal of the digital-to-analog converter DAW. The horizontal lines ani and an9 indicate that the output signal increases as a DC voltage from counting position to counting position by a predetermined amplitude. The sawtooth voltage sz, which, as the second part of the diagram shows, is synchronized with the AC mains voltage n from the power supply unit NT via the mains synchronization stage NS.

The sawtooth voltage sz and the direct voltage ani to an9 of the digital-to-analog converter DAW are fed to the phase shifter PS. The ignition pulses il to i9 are derived by comparing the two voltages. The ignition pulses il occur when the sawtooth voltage sz exceeds the analog signal ani from the digital-to-analog converter DAW. The ignition pulses il therefore lie at the beginning of the half-wave of the mains alternating voltage n. The sawtooth voltage sz changes as a reference variable, during the period twice from zero to a predetermined, constant end value.

FIG. 4 shows the block diagram of the sending point, the duty cycle for motor M according to FIG. 2 being predefined and the stepping pulses for the digital-to-analog converter DAW of the receiving point already being generated at the sending point. The clock generator TGe of the reception 615 772

This can be omitted, since the pulses via filters Fl and F2 can be fed directly to the digital-to-analog converter DAW via the non-clock-controlled switching logic SL in the correct polarity for switching on or switching back.

When the switch-on control command is issued via the switch key T3, the transmission generator SG is set to the frequency f3. Contact T3 'closes a response circuit for switching relay B, which indicates the switch-on state. This switching relay B closes a holding circuit via its contact b2, which can be interrupted with a delay by a switch-off delay device AbV. In the initial time value circuit AnZ, which is designed as an allocator, a counter reading is stored, which has a duty cycle in time units, for. B. minutes. This counter reading is transferred to the time counter Zj when the switch-on control command is given with the contact T3 '. A clock generator TGs, which, like the other transmission devices, can be connected to supply voltage + U via contact b2 of switching relay B, supplies reset pulses with the reset clock tl, which, for. B. has a frequency of Vöo. The time counter Zx is therefore reset by one counting position in one-minute intervals, based on the transmitted, preset counter reading, which determines the duty cycle. When the time counter Z \ reaches its zero position, the zero position control circuit NC responds, which switches on the shutdown device AS. This triggers the automatic transmission of the switch-off control command with the frequency f4. At the same time, the switch-off delay device AbV is activated, which delays switching relay B and thus switches off all transmission devices. As the contact T4 indicates, the switch-off control command can also be sent prematurely during the duration of the switch-on time. In this case, the switch-off device AS is preferably also controlled in order to achieve the delayed switch-off of the switching relay B and the resetting of the transmitter devices to their starting position.

The counter control circuit ZStl of the time counter Z can be controlled via a time selector switch ZW in such a way that the counter reading of the time counter Zx changes quickly and the duty cycle can be lengthened or shortened. The time selection switch ZW has a stable middle switch-off position m, in which the counter control circuit ZStl switches on the reset clock tl of the clock generator TGs for resetting the time counter Z. In the two self-triggering working positions v and r of the time selection switch ZW, the counter control circuit ZStl is reversed so that the faster switching clock t2 of the clock generator TGs is used either for switching on or for switching back the time counter Zt. The switching clock t2 with 1 Hz is selected so that the change in the counting positions of the time counter ZI can be observed. For this purpose, a decoder DK and a digital display device IN are provided, by means of which the counting position of the time counter Z1 can be converted and displayed. As the query key T indicates, the display can be switched on if necessary. It is advisable to switch on the display even if the time selector switch ZW changes the counting position of the time counter Z \ in one direction or the other. Since the decoder DK and the digital display device IN are also used to query the control counter Z2, it is advisable to use the query key T and the time selector switch ZW to switch over, which switches off the control counter Z2 and the time counter Zj turns on.

As the switching buttons T1 and T2 indicate for the two control commands of the control variable, the transmission generator SG with the assigned frequencies f 1 and f2 is now driven in pulses via the counter control circuit ZSt2 of the control counter Z2. The pulse generator TGs delivers the pulses with the fixed switching clock t2, for the duration

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the push of a button. In the counter control circuit ZSt2, precautions are taken to ensure that, regardless of the switch-on and switch-off times of the switch buttons T1 and T2, undistorted pulses are always transmitted. The control counter Z2 is controlled by the counter control circuit 5 ZSt2 such that it is switched on via the control pulses with the frequency f 1 and switched back via the control pulses with the frequency f2. If this control counter Z2 of the sending point is constructed in exactly the same way as the switching counter in the digital-to-analog converter DAW of the receiving point, I0 then the counting position of the control counter Z2 always indicates the value of the control variable effective in the receiving point. As the key contacts T1 'and T2' on the decoder Dk and the digital display device IN indicate, the counter reading of the control counter Z2 can be observed during the transmission of the 'control commands with the frequencies f 1 and f2 and the change in the control variable can thus be followed . Of course, with a control button, not shown,

Similar to the query button T, the counter reading of the control counter Z2 can be displayed at any time.

For the operation of the switch buttons, it is advantageous if the switch buttons T1 and T2 as well as the switch buttons T3 and T4 are combined into a common switch button with a stable switch-off position and two self-triggering working positions. Rocker switches are particularly suitable for this. The time selector switch ZW is also best designed as a rocker switch.

It is important that when the transmission devices are switched off, the counters ZI and Z2 and their control circuits ZStl and ZSt2 are reliably brought into their zero position. The easiest way to achieve this is if these devices are designed so that they always assume the zero position or the starting position after they have been switched off and on again. Then the control of these devices via the shutdown device AS can be omitted.

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2 sheets of drawings

Claims (11)

615772 PATENT CLAIMS 1. Arrangement for the remote-controlled, wireless transmission of a variable control variable for an electrical device of a receiving point from a transmitting point, by means of control commands with different frequencies, characterized in that two control commands with different frequencies (f 1, f2) are provided on the transmitting point for the control variable are that one transmitted control command with the first frequency (f 1) indicates an enlargement and the other control command with the second frequency (f2) a decrease in the control variable that during the duration of the pending control command (fl or f2) with the help of a Clock generator (TGs or Tge) with a fixed switching clock (t2) switching pulses or downshifting pulses for a step-wise adjustable forward and reverse digital-analog converter (DAW) of the receiving point can be derived and that the analog output signal of the digital ana log Converter (DAW) represents the value of the control variable. 2. Arrangement according to claim 1, characterized in that the control command (f 1 or f2) can be sent to the sending point by means of a switch button (T1 or T2), the contact (T1 or T2) of which is a transmitting generator (SG) assigned frequency (f 1 or f2), and that at the receiving point the control command (f 1 or f2) can be screened out via a filter (Fl or F2) and fed to a switching logic (SL) which is dependent on the presence of the Another or another control command (fl or f2) with the pulses of a clock generator (TGe) of the receiving point switches the digital-to-analog converter (DAW) on or down. 3. Arrangement according to claim 1, characterized in that the control command (f 1 or f2) can be initiated at the sending point by means of a switch button (T1 or T2), the contact (T1 or T2) of a transmitting generator (SG) on the assigned frequency (f 1 or f2) that the control command (f 1 or f2) with the pulses of a clock generator (TGs) of the transmitting station can be transmitted as a pulse sequence with a predetermined pulse repetition frequency (t2) during the duration of the key actuation, and that the receiving point, the pulses of the screened control command (fl or f2) directly switch the digital-to-analog converter (DAW) on or down. 4. Arrangement according to claim 3, characterized in that the digital-to-analog converter (DAW) contains a switching counter with a predetermined number of counting positions, that each counting position is assigned an equally large change in amplitude of the analog output signal that the switching counter is between a zero position and an end position can be set in any counting position and that this setting of the switching counter can be carried out via a common control input by means of pulses of different polarity in the forward and reverse directions. 5. Arrangement according to claim 2 and 4, characterized in that the switching logic (SL) depending on the presence of one or the other control command (f 1 or f2) the pulses of the clock generator (TGe) in one or the other polarity to the switching counter of the digital-to-analog converter (DAW) so that it can be switched in the forward or reverse direction 6. Arrangement according to claim 4, characterized in that the screened-out pulses of the control command (f 1 or f2) via a non-clock-controlled switching logic (SL) in the assigned polarity directly to the switching counter of the digital-to-analog converter (DAW ) can be forwarded so that it can be switched in the forward or reverse direction 7. Arrangement according to claim 6, characterized in that the pulses of the transmitted control command (f 1 or f2) can be fed to a control counter (Z2) of the sending point, that this control counter (Z2) via the pulses of a control command ( f 1) can be switched forward and switched back via the impulses of the other control command (f2) that the control counter (Z2) of the transmitting point is designed with the same number of counting positions as the switching counter of the digital-analog converter (DAW) the receiving point that the counting position of the control counter (Z2) can be displayed via a decoder (DK) and a digital display device (IN) and that this decoder (DK) and this digital display device (IN) via contacts (T1 'or . T2 ') of the switching buttons can only be switched on during the transmission of a control command (f 1 or f2) to the supply voltage. 8. Arrangement according to claims 5 and 7, wherein the device is provided for connection to an AC network, characterized in that the analog output signal (ani to an9) of the digital-to-analog converter (DAW) and a network synchronization signal (NS) in the form mains synchronous sawtooth voltages (nz) can be fed to a phase shifter (PS) so that by comparison the ignition pulses (i) for a phase control (MSt) of an electrical device, preferably a motor (M), are derived from that at the sending point Two further control commands (f3, f4) are available, via which a switch-on and switch-off command can be transmitted to the receiving point, and that the screened-out control commands (f3, f4) control a bistable switching amplifier (SV) with switching relay (A) at the receiving point, the Switching relay (A) takes over the switching on and off (al) of the electrical device (M) and the resetting (a2) of the digital-to-analog converter (DAW) to the zero position. 9. Arrangement according to claim 8, characterized in that with the transmission of the switch-on control command (f3) at the same time a characteristic of the switch-on state and the transmitting devices on supply voltage (+ U) switching (b2) switching relay (B) can be excited and switched into a holding circuit that a time counter (ZI) can also be set to a counter reading that specifies the switch-on duration in time units, that the time counter (ZI) can be reset via the clock generator (TGs) of the sending point with a reset clock (tl) corresponding to the time units, that when the zero position is reached of the time counter (ZI) via a zero position control circuit (NC) and a shutdown device (AS) can automatically send out a shutdown control command (f4) that characterizes the shutdown and the shutdown of the holding circuit of the switching relay (B) can be initiated with a delay using a shutdown delay device (AbV) that the meter reading specifying the duty cycle in a start ngszeitwerttschaltung (AnZ), which is designed as an assignor, is specified, and that this counter reading can be transferred to the time counter (ZI) when the switch-on control command (f3) is sent. 10. The arrangement according to claim 9, characterized in that the clock generator (TGs) of the transmitting point is connected via a counter control circuit (ZStl) to the control inputs of the time counter (ZI), that this counter control circuit (ZStl) via the stable starting position (m) of a time selection switch (ZW) can be controlled in such a way that the reset clock (tl) of the clock generator (TGs) can be fed to the reset input of the time counter (ZI) or can be fed to the control input of the time counter (ZI) in such a way that it is reset so that the time selection switch (ZW ) has two self-triggering working positions (v, r) in which the counter control circuit (ZST1) can be controlled in such a way that the fixed switching cycle (t2) of the clock generator (TGs) for the duration of maintaining the working position (v or r) the time counter ( ZI) switches on or back faster and that the counter reading of the time counter (ZI) via the decoder (DK) and the digital display device (IN) for the control counter (Z2) of the control variable can be displayed. 11. The arrangement according to claim 10, characterized in that the decoder (DK) and the digital display device (IN) via a query button (T) and the working positions (v, r) of the time selection switch (ZW) from the control counter ( Z2) 2nd 5 10th 15 20th 25th 30th 35 40 45 50 55 60 65 can be switched off for the control variable and connected to the time counter (ZI), as well as connected to the supply voltage (+ U).