JPH071943B2 - 2-wire remote control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention connects a main body of a water heater, a bathtub, an air conditioner or the like and an operating device for remotely controlling them by a two-core cable. The present invention relates to a two-wire remote control device.

<Prior art and its problems> Two lines of a conventional digital signal transmission system in which a main body controller attached to a main body to be controlled such as a water heater and one or a plurality of remote controllers are connected by a two-core cable. The first problem of the remote control device is that, as disclosed in Japanese Utility Model Publication No. 1-19504, for example, a digital signal transmission system using a microcomputer, a dedicated IC, etc. is adopted, and therefore the entire device is It's a big complex thing, and thus an expensive thing. The second problem is the case of a simple two-wire remote control device, which is different from the above. However, as seen in some cases, the variable voltage when the constant voltage is divided by the reference resistance and the variable resistance is used. Since the voltage across the resistor is used as the signal voltage for operating the main control circuit, the linearity of the total operating signal voltage with respect to the variable resistance is poor, and the operating signal voltage range cannot be wide. is there.

The present invention is a two-wire remote control device using a complete analog signal transmission system which can eliminate the first problem, that is, the complexity and cost of the device, by the above-mentioned digital signal transmission system. A device capable of solving the problem, that is, a main control circuit, which is a simple method, has a circuit related to the operation signal voltage generation composed of a constant current circuit and a variable resistance circuit. It is an object of the present invention to provide a two-wire remote control device that can ensure the linearity with respect to.

<Means for Solving the Problems> In order to achieve the above object, a two-wire remote control device of the present invention includes a main body controller attached to a main body to be controlled,
A two-wire remote control device comprising a remote controller installed at a location different from the main body controller and a single two-core cable connecting the main body controller and the remote controller, a). The main body controller is connected between a DC power supply, a constant voltage circuit, a main control circuit, a power operational amplifier having a plus input terminal, a minus input terminal, and an output terminal, and between the main control circuit and the plus input terminal. A voltage setting circuit, a mode switching element connected between the negative input terminal and the main control circuit and used for switching the operation mode of the power operational amplifier, and between the main body controller and the remote controller. A main body controller terminal for transmitting and receiving the signal, and a differential amplifier circuit type input signal conversion circuit connected to the main body controller terminal and the main control circuit, (b). The remote controller comprises an analog operation signal generation circuit composed of a switch connected to short-circuit a plurality of low antibodies among a plurality of resistors including a variable resistor by turning the switch ON, and an analog drive signal. An analog drive signal determination circuit and a lamp / buzzer circuit for receiving and processing
A bridge type rectifier circuit in which a remote controller terminal corresponding to the main body controller terminal is connected to the AC side terminal, and the DC side terminal is connected to the analog drive signal discrimination circuit and the lamp / buzzer circuit. And (c). In the input mode in which the main body controller inputs an analog operation signal from the remote controller, (a) the voltage setting circuit generates an input voltage under the command of the main control circuit, and this voltage is As a constant current circuit, the signal is transmitted to the positive input terminal of the power operational amplifier, and (b) the power operational amplifier receives a negative feedback signal from the remote controller of the output destination through the mode switching element. While functioning, the input voltage transmitted from the voltage setting circuit as described above is supplied to the analog operation signal generation circuit by a constant current method, and (c) the analog operation signal generation circuit An analog operation signal is generated by inputting the input voltage of the constant current method of, and the same signal is transmitted to the input signal circuit. (D) The input signal conversion circuit (D) has a circuit configuration for inputting a control signal and converting the signal into a voltage value suitable for the main control circuit and outputting the voltage value to the main control circuit. In the output mode in which the main body controller outputs an analog drive signal to the remote controller, (a) the main control circuit starts a required control process based on the analog operation signal input in the input mode, and For the purpose of displaying the state of the control process on the lamp buzzer in the remote controller, it is used to generate an analog drive signal for the voltage setting circuit and transmit it to the power operational amplifier. (B) Voltage setting circuit Generates an analog drive signal under the command of the main control circuit and transmits it to the positive input terminal of the power operational amplifier, and (c) the power operational amplifier outputs a negative signal from its output terminal side. It functions as a constant voltage circuit by receiving the feedback signal through the mode switching element, and it is transmitted from the voltage setting circuit as described above. The analog drive signal is supplied to the bridge type rectifier circuit of the remote controller at a constant voltage. (D) The analog drive signal discrimination circuit and the lamp / buzzer circuit output the analog drive signal of the above constant voltage. It has a circuit configuration for receiving via a bridge rectifier circuit, determining the nature of the signal, and starting a lamp / buzzer, (e). Further, it is characterized in that the input mode for inputting the analog operation signal and the output mode for outputting the analog drive signal are configured to be switched at a constant cycle based on a command from the main control circuit.

<Operation> In the two-wire remote control device of the present invention, the circuit that generates the analog operation signal voltage output from the remote controller to the main control circuit of the main body controller is composed of a constant current and a variable resistance circuit. Therefore, the linearity of the analog operation signal voltage input to the main control circuit with respect to the variable resistance becomes very good. In addition, since the analog operation signal is input to the main control circuit via the input signal conversion circuit of the differential amplifier circuit type, the accuracy of the operation signal becomes very good. In addition, the final stage output circuit that generates the lamp / buzzer drive signal output from the main unit controller to the remote controller is a variable constant circuit consisting of an operational amplifier and a simple resistance circuit connected to the negative input terminal of the operational amplifier. Since it is a voltage circuit, it is extremely simple,
The variation in characteristics is also small. Furthermore, since the signals exchanged between the main body controller and the remote controller are all analog signals, the two-wire remote control device of the present invention is a complete analog signal transmission system, and the conventional digital signal transmission system. Compared with the two-wire type remote control device of the type, the complexity of the circuit is eliminated and the manufacturing cost of the device is remarkably low.

<Example> A two-wire remote control device of the present invention will be described with reference to the drawings illustrating an example thereof. FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a flow chart showing an input mode operation of this embodiment, FIG. 3 is a flow chart showing an output mode operation of this embodiment, and FIG. A flow chart showing the operation of switching between the input mode and the output mode in the present embodiment, FIG. 5 is a graph showing the type of voltage of the analog operation signal, and FIG.
The figure is a graph showing the type of voltage of the analog drive signal.

First, as the first case, the description starts from the case where the main body controller of the two-wire remote control device of the present invention is in the input mode in which an analog operation signal is input from the remote controller. In FIG. 1, the main control circuit 100 (comprising a microcomputer) in the main body controller 150 attached to the main body to be controlled stands by for an input of an operation signal, that is, an input voltage. To do. At this time, the terminal O ₁ of the main control circuit 100 is OFF, so the switching element (transistor array) 101 is also OFF, and the resistor 107 and the resistor 111 are turned off.
The switching element (FET) 112 connected via is also turned off. Also, at this time, the terminal O ₂ of the main control circuit 100 is also turned off.
Therefore, the switching element (transistor array) 102 is also turned off. At this time, the combination output terminals O ₃ -O ₄ -O ₅ of the main control circuit 100 issue a command to the voltage setting circuit 103 to set and output the input voltage (the flowchart of FIG. 2, Step 20
0, 201). As a result, the voltage setting circuit 103
The input voltage (Vi) is set and applied to the plus input terminal 116 of the power operational amplifier 114 (at this point, the voltage at the end 120 of the DC power supply 119 passes through the resistor 108 and the resistor 118, Applied to the negative input terminal 115 of the power opamp 114). The output voltage Vo from the output terminal 113 of the power operational amplifier 114 is transmitted to the remote controller (hereinafter, abbreviated as remote controller) 50 via one wire 140 of the two-core cable 130, and the analog signal in the remote controller is transmitted. It is applied to the end point 121 of the resistor 108 in the main body controller 150 via the variable resistance circuit (that is, the resistor 1, the resistor 2, the temperature adjustment variable resistor 3) of the operation signal generation circuit 60. Remote control at this point
When the operation switch 4 in the analog operation signal generation circuit 60 in 50 is turned on, the variable resistance circuit (resistors 1, 2,
The resistance value of 3) becomes small, so that the resistor 108 described above is used.
The voltage at the end point 121 of (1) increases (compared to before the operation switch 4 was turned on). The voltage value (V
i ') is led to the minus input terminal 115 of the power operational amplifier 114 through the resistor 118, the above-mentioned input voltage (Vi)
The input of the power operational amplifier 114 is Vi-V
Since it becomes i ′, the output voltage Vo of the power operational amplifier 114 decreases. Next, the voltage generated in the analog operation signal generation circuit 60 of the remote controller, that is, the potential difference Vo-Vi ′ between the circuit 110 and the circuit point 109 is applied to the differential amplification circuit type input signal conversion circuit 104 of the amplification degree α, The voltage conversion of V = α (Vo-Vi ′) is performed. (The input signal conversion circuit 104 includes a negative feedback buffer circuit type operational amplifier 105 in the first stage for the purpose of accurately detecting a voltage, and a negative feedback differential amplifier circuit type in the latter stage for the purpose of maintaining the accuracy of the amplification degree (α). The operational amplifier 106 is used.) Now, the output voltage V of the input signal conversion circuit 104 is input to the input terminal I ₁ of the main control circuit 100. Since the voltage V in this case is V = v ₁ (see FIG. 5), the main control circuit 100 determines that the operation switch 4 of the analog operation signal generation circuit 60 described above is ON ( Flowchart of FIG. 2, steps 202, 203, 204
reference).

(If the setting of the variable resistor 3 for temperature control is changed while the operation switch 4 is OFF, V = v _{2 to} v ₃ (Fig. 5
Then, the main control circuit 100 controls the required temperature adjustment based on the main voltage value V (see the flowchart of FIG. 2, steps 205 and 206). ) As described above, in the input mode of the two-wire remote control device of the present invention, the analog operation signal for operating the main control circuit is the constant current circuit, the resistance circuit (resistors 1, 2, 3) and the operation switch. Since it is formed on the basis of No. 4, the linearity of the analog operation signal is very good, so that a wide range operation range can be given to the main control circuit.

Next, as a second case, a case of an output mode in which an analog drive signal is output from the main body controller 150 of the two-wire remote control device of the present invention to the remote controller 50 will be described. In FIG. 1, when the main control circuit 100 detects the ON state of the operation switch 4 of the remote controller 50, its terminal O ₁ turns ON, and therefore the switching element (transistor array) 101 also turns ON.
The switching element (FET) 112 connected to the resistor 107 and the resistor 111 is also turned on. Furthermore, the main control circuit
The terminal O _{2 of} 100 is also turned on, and thus the switching element (transistor array) 102 is also turned on, and
Contrary to the above case, the end point 121 of the resistor 108 becomes the ground potential. Turning OFF the terminals O ₁ and O ₂ of the main control circuit 100 as described above
→ As a result of the ON switching, the output Vo is connected to the resistor 117 and the resistor 117 at the negative input terminal 115 of the power operational amplifier 114.
The voltage of the line point 122 divided by 118 is applied, and as a result, the power operational amplifier 114 functions as a variable constant voltage source. Now, at this time, a command indicating that a signal for lighting the operation lamp 10 of the remote controller 50 should be output from the combination output terminals O ₃ -O ₄ -O _{5 of} the main control circuit 100 is the voltage setting circuit. Issued for 103. as a result,
The voltage setting circuit 103 outputs an analog drive signal Vi (where Vi = V ₁ (see FIG. 6)) for turning on the operation lamp 10, which is applied to the positive input terminal 116 of the power operational amplifier 114. To be done. Negative input terminal 115
Is the ground potential, the result of the above is that the power
An output of Vo = V ₁ is output from the operational amplifier 114 (see the flowchart of FIG. 3, steps 300, 301 and 302). This output is then applied to the remote control terminal 132, passed through the bridge rectifier circuit 5, and further applied to the constant voltage diode 9 via the resistors 7 and 8, where V ₁ > V _ZD9 (however,
Since V ₁ is set so that V _ZD9 is the operating voltage of the constant voltage diode 9, the switching transistor 6 is turned on, and therefore the analog drive signal voltage V ₁ is
The operation lamp (LED) 10 is applied via the resistors 11 and 12 to light the operation lamp. However, since this signal voltage V ₁ is set lower than the operating voltage of the constant voltage diode 16 connected to the next stage of these circuits, the combustion lamp (LED) 17
Never light up. Now, when the combustion sequence is started after the operation is started in this way, first, the combustion lamp 17 of the remote controller 50 is turned on from the combined output terminals O ₃ -O ₄ -O _{5 of} the main control circuit 100. A command indicating that a signal for causing the voltage to be output is output to the voltage setting circuit 103. As a result, the voltage setting circuit 103 outputs an analog drive signal Vi (where Vi = V ₂ (see FIG. 6)) for lighting the combustion lamp 17. as a result,
Finally, in the remote controller 50, the voltage (voltage value V ₂ ) of this analog drive signal is applied to the constant voltage diode 16 via the resistors 13 and 14, and this voltage value V ₂ is applied to this diode.
Since it is set to exceed the operating voltage of 16, switching transistor 15 is turned on, and the same signal voltage is applied to resistor 18
The combustion lamp (LED) 17 is turned on via. (Refer to the flow chart of FIG. 3, steps 303 and 304) Now, the operation of the two-wire remote control device of the present invention in the input mode and the output mode is as shown in the flow sheets of FIG. 2 and FIG. 3, respectively. However, further, the constituent elements / elements of the main body controller 150 switch the input mode and the output mode based on a command of the main control circuit 100 at a constant cycle (see FIG. 4) to perform an analog operation signal and an analog drive signal. A circuit structure for performing control such that a single two-core cable 130 laid between the main body controller terminal 131 and the remote controller terminal 132 is periodically and alternately transmitted, that is, analog two-core transmission control is performed. By using such a configuration, a complete analog signal transmission system is realized. Therefore, comparing the two-wire remote control device of the present invention with a similar device of the conventional digital signal transmission system eliminates circuit complexity.

In this embodiment, the case where one operation switch is used in one remote controller has been described. However, since the analog operation signal generation circuit in this embodiment is a simple circuit including a resistance circuit and a switch, Not only can the number of switches in the remote controller be increased, but also the number of remote controllers can be increased easily and at low cost. Further, in the present embodiment, only the single operation lamp and the single combustion lamp are considered as the display lamps, but the number of these lamps is increased and other lamps (for example, temperature control lamps) are used.
It is also possible to easily add various types of buzzers, etc. (although it is necessary to change the command signal from the combined output terminal of the main control circuit and the number of output stages in the main controller). it can.

<Effect> The first effect of the two-wire remote control device of the present invention is input to the main control circuit because the circuit involved in the generation of the analog operation signal is composed of the constant current circuit and the variable resistance circuit. The linearity of this analog control signal is very good. Second
The effect of the above is that the analog operation signal is input to the main control circuit via the input signal conversion circuit of the differential amplifier circuit method with high amplification accuracy, so that the range of the operation signal is combined with the good linearity described above. Can be wide, and its accuracy is extremely good. The third effect is that the circuit for generating the analog drive signal output from the main body controller to the remote controller is composed of an operational amplifier and a simple resistance circuit connected to its negative input terminal. Therefore, this drive signal generation circuit is extremely simple and has little variation in characteristics. The fourth effect is that since the signals exchanged between the main body controller and the remote controller are all analog signals, the two-wire remote controller of the present invention is a complete analog signal transmission system. Compared with the conventional two-wire remote control device of digital signal transmission system,
The complexity of the circuit is eliminated and the cost of manufacturing the device is significantly lower. The fifth effect is that since the analog operation signal generation circuit in the remote controller is composed of a simple variable resistance circuit and operation switches, it is easy and economical not only to increase the number of switches but also to increase the number of remote controllers themselves. Can be carried out.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a two-wire remote control device of the present invention, FIG. 2 is a flow chart showing an operation in an input mode of the embodiment, and FIG. 3 is an operation in an output mode of the embodiment. FIG. 4 is a flow chart showing the operation of switching the input mode and the output mode of the embodiment, and FIG.
FIG. 6 is a graph showing the type of voltage of the analog operation signal, and FIG. 6 is a graph showing the type of voltage of the analog drive signal. 5: Bridge type rectifier circuit 50: Remote controller 60: Analog operation signal generation circuit 70: Analog drive signal discrimination circuit 80: Lamp circuit 100: Main control circuit 103: Voltage setting circuit 104: Input signal conversion circuit 114: Power operational amplifier 101, 107, 111, 112, 117, 102, 108, 118: Mode switching terminals 114: Power operational amplifier 119: DC power supply 123: Constant voltage circuit 130: 2-core cable 131: Main unit controller terminal 132: Remote controller Terminal 150: Main unit controller

Claims (1)

[Claims] 1. A main body controller attached to a main body to be controlled, a remote controller installed in a place different from the main body controller, and a single unit connecting the main body controller and the remote controller. A two-wire remote control device comprising a two-core cable comprising: (a). The main body controller is connected between a DC power supply, a constant voltage circuit, a main control circuit, a power operational amplifier having a plus input terminal, a minus input terminal, and an output terminal, and between the main control circuit and the plus input terminal. A voltage setting circuit, a mode switching element connected between the negative input terminal and the main control circuit and used for switching the operation mode of the power operational amplifier, and between the main body controller and the remote controller. A main body controller terminal for transmitting and receiving the signal, and a differential amplifier circuit type input signal conversion circuit connected to the main body controller terminal and the main control circuit, (b). The remote controller comprises an analog operation signal generation circuit composed of a plurality of resistors including a variable resistor and a switch connected to short-circuit a plurality of low antibodies in the resistors, and an analog drive signal. Drive signal discrimination circuit and lamp / buzzer circuit for receiving and processing the signal, remote controller terminal corresponding to the main controller terminal, the remote controller terminal is connected to the AC side terminal, and the DC side terminal is the analog drive And a bridge type rectifier circuit connected to the signal discrimination circuit and the lamp / buzzer circuit, (c). In the input mode in which the main body controller inputs an analog operation signal from the remote controller, (a) the voltage setting circuit generates an input voltage under the command of the main control circuit, and this voltage is As a constant current circuit, the signal is transmitted to the positive input terminal of the power operational amplifier, and (b) the power operational amplifier receives a negative feedback signal from the remote controller of the output destination through the mode switching element. While functioning, the input voltage transmitted from the voltage setting circuit as described above is supplied to the analog operation signal generation circuit by a constant current method, and (c) the analog operation signal generation circuit An analog operation signal is generated by inputting an input voltage of the constant current method of, and the same signal is transmitted to the input signal conversion circuit, and (d) the input signal conversion circuit A circuit configuration for inputting the analog operation signal, converting the signal into a voltage value suitable for the main control circuit, and outputting the voltage value toward the main control circuit; (d). In the output mode in which the main body controller outputs an analog drive signal to the remote controller, (a) the main control circuit starts a required control process based on the analog operation signal input in the input mode, and For the purpose of displaying the state of the control process on the lamp buzzer in the remote controller, it is used to generate an analog drive signal for the voltage setting circuit and transmit it to the power operational amplifier. (B) Voltage setting circuit Generates an analog drive signal under the command of the main control circuit and transmits it to the positive input terminal of the power operational amplifier, and (c) the power operational amplifier outputs a negative signal from its output terminal side. It functions as a constant voltage circuit by receiving the feedback signal through the mode switching element, and it is transmitted from the voltage setting circuit as described above. The analog drive signal is supplied to the bridge type rectifier circuit of the remote controller at a constant voltage. (D) The analog drive signal discrimination circuit and the lamp / buzzer circuit output the analog drive signal of the above constant voltage. It has a circuit configuration for receiving via a bridge rectifier circuit, determining the nature of the signal, and starting a lamp / buzzer, (e). A two-wire remote control device configured to switch between an input mode for inputting the analog operation signal and an output mode for outputting the analog drive signal at a constant cycle based on a command from the main control circuit.