JPH0137036B2 - - Google Patents

Description

Detailed Description of the Invention Technical Field The present invention relates to a control system in which one or more slave units are connected to a base unit, and a control device connected to the base unit can be controlled by the slave unit. Regarding equipment.

Prior Art FIG. 1 is a prior art electrical circuit diagram. This light control device can perform light control by controlling the conduction angle of a lighting lamp 2 powered by a power source 1 such as a commercial AC power source using a triax 4 provided in a base unit 3. . The base unit 3 includes an on-off switch 5 that turns on and off the illumination light 2, an up switch 6 that is operated to brighten the illumination light 2, and a down switch 7 that is operated to dim the illumination light 2. include. Such a switch 5,
6 and 7 are connected via six lines 8 to an on/off switch 10, an up switch 11, and a down switch 12 provided in the slave unit 9, respectively. Such prior art clearly
There are too many. Therefore, it is desirable to reduce the number of lines 8.

Another prior art technique capable of reducing the number of lines is configured to superimpose, for example, a pulse modulated signal on a power line for supplying power from a parent device to a slave device. Such prior art has a complex structure, especially when there are relatively few signals to be transmitted, such as in a dimming device.
A simple configuration is desired.

Purpose An object of the present invention is to provide a control device that can reduce the number of lines and simplify the configuration.

Composition of the Invention In the present invention, a parent device and a slave device are connected via a pair of lines, and the parent device includes a power source that applies voltage between the lines, a level discrimination means that discriminates the level of the voltage between the lines, and a power source that applies a voltage between the lines. A means provided in connection with the level discrimination means, for disabling the level discrimination means for a time longer than the delay time of a change in the signal from the slave unit due to stray capacitance between the lines; and control means for controlling the load so that the load is in an operating state corresponding to the voltage between the lines in response, and the slave unit is a control device characterized in that it includes means for changing the voltage between the lines. .

In a preferred embodiment, the power supply is characterized in that it maintains the current flowing through the line at a predetermined value.

Embodiment FIG. 2 is an electrical circuit diagram of an embodiment of the present invention. In the light control device, power from a power source 1 such as a commercial AC power source is applied to a lighting lamp 2 to be dimmed via a triax 21 provided in a base unit 20. By controlling the conduction angle of the triax 21, the illumination lamp 2 is dimmed. The triac drive circuit 52 has an output terminal 22. The output terminal 22 is at a high level in the ON state in which the conduction angle of the triac 21 is controlled and power is supplied to the illumination lamp 2, and remains at a low level when the illumination lamp 2 is not supplied with power. This triac drive circuit 52 has three input terminals 23, 24, and 25. Input terminal 23
The triac 21 is controlled to conduct or to extinguish each time the signal becomes high level. When a high-level signal is applied to the input terminal 24, the triac drive circuit 52 increases the conduction angle of the triac 21 during the high-level holding period, and then maintains the maximum conduction angle. . When a high-level signal is applied to the input terminal 25, the conduction angle of the triac 21 is gradually changed to a smaller value during the period in which the high-level signal is applied, and the conduction angle remains at a predetermined small value. The conduction angle becomes zero.

The power from the power supply 1 is full-wave rectified and smoothed by the rectifier circuit 26 and the capacitor 57, and then is passed through the line 27.
A predetermined voltage VA is applied to the transistor Tr4 and the Zener diode ZA. A transistor Tr5, a Zener diode Z23, and a transistor Tr3 are connected to the line 28. This transistor Tr3 becomes conductive when the output terminal 22 of the triac drive circuit 52 becomes high level. Transistor Tr5
A constant current circuit 60 is connected between the lines 30 and 31.
is intervened. This constant current circuit 60 includes a resistor R6
0, a transistor Tr6, and a Zener diode Z01, and maintains the current flowing through the lines 30 and 31 at a predetermined value. Power from the constant current circuit 60 is connected to the slave device 32 through lines 30 and 31 which are connected to the outside from the line 28 .

The level discrimination means 33 includes resistors R1 to R7, which divide the voltage of the line 27, and comparison circuits M1 to M6. Line 28 is connected to one input of comparator circuits M1-M6. The voltage divided by the resistors R1 to R7 is applied to the other input terminals of the comparison circuits M1 to M6.

FIG. 3 is a simplified block diagram of comparator circuit M1. This comparison circuit M1 includes a so-called open collector type transistor 34. When the voltage at the non-inverting input terminal 35 is greater than or equal to the voltage at the inverting input terminal 36, the transistor 34 is cut off and its output terminal 37 becomes high level. When the voltage at non-inverting input terminal 35 is less than the voltage at inverting input terminal 36, transistor 34 is conductive and the output impedance of output terminal 37 is low. Although the remaining comparison circuits M2 to M6 also have similar configurations, the connection manner of their pair of input terminals is different from that of comparison circuit M1 in comparison circuits M2, M4, and M6.
The opposite is true. The output terminals of the comparison circuits M1 to M6 are connected to resistors R11 to R14 and diodes D1,
Connected in relation to D2. Comparison circuit M1, M
2, M6 or diodes D3, D4, and an on/off switch 38 is connected to the diodes D3, D4. Diode D
The input terminal 23 is connected to the connection point between the switch 3, D4 and the switch 38. The output terminal of the comparator circuit M3 is connected to the up switch 39 via a diode D5, and is also connected to the input terminal 24. The outputs of comparison circuits M4 and M5 are given to NOR gate 41. The output from NOR gate 41 is applied to input terminal 25 via diode D6. A down switch 40 is connected to this input terminal 25. The input impedances of the comparison circuits M1 to M6 have extremely high values.

The disabling means 70 includes a buffer 71 receiving signals from a comparison circuit M6 and a resistor R15. The buffer 71 has a high input impedance, and when its input is at a high level, the output terminal 7
2 is at a high level, and when the input terminal is at a low level, the output terminal 72 is at a low level. The output terminal 72 of this buffer 71 rapidly charges the capacitor C via a diode D14 connected in the forward direction to the resistor R32. When the output terminal 72 of the buffer 71 becomes low level, the charge in the capacitor C is slowly discharged via the resistor R31. The output voltage of capacitor C is input to inverter 74 and inverted. Comparison circuit M
1 and M2 are connected to the output terminal of an inverter 74 via a diode D13. The input impedance of inverter 74 is extremely high.
The inverter 74 operates at a discrimination level l1 (sixth level to be described later).
(see FIG. 2), the output terminal is set to a low level, and when the input level is less than the discrimination level l1, a high level signal is derived.

In the handset 32, an on/off switch 43 and a Zener diode Z12 are connected in series to the lines 30 and 31. A diode D7 connected in the forward direction and a Zener diode Z56 connected in the opposite polarity are connected in series to the connection point between the on-off switch 43 and the Zener diode Z12. A series circuit consisting of Zener diodes Z34 and Z45 connected to the up switch 44 and the down switch 45, respectively, is connected in parallel to the Zener diode Z56, and a light emitting diode LD2 for display is also connected to the Zener diode Z56. line 3
0 is connected to the base of the transistor Tr1 via a resistor R21 and a Zener diode Z1.
A light emitting diode LD1 for display is connected to this transistor Tr1, and a resistor R23
A series circuit of the diode D8 and the diode D8 is connected. A connection point between resistor R23 and diode D8 is connected to the base of transistor Tr2 via diode D9. Transistor Tr2 is connected to line 31
and Zener diodes Z56, Z34, and Z45 via a diode D10.

Referring to FIG. 4, Zener diode Z01,
Breakdown voltage V01, V12, V23, 0 of Z12, Z23, Z34, Z45 and Z56
34, V45, V56, and comparison circuit M1~
Voltages V1 to V6 applied to M6 by voltage dividing resistors R1 to R7 are set as shown. The break voltage VA of the Zener diode Z1 is mixed with the voltage VA of the Zener diode ZA in the circuit diagram.

Assume that the triax 21 is in a disconnected state. At this time, the output terminal 22 remains at a low level, so the transistor Tr3 is cut off. Therefore, the voltage between lines 30 and 31 is
This is the voltage V01 corresponding to the Zener diode Z01. At this time, the Zener diode Z1 is conducting, so the transistor Tr1 is conducting,
Light emitting diode LD1 lights up. The lighting of the light emitting diode LD1 indicates that the lighting lamp 2 is turned off. Transistor Tr2 is cut off.

When the on/off switch 43 is operated, the Zener diode Z12 becomes conductive. Therefore, due to the action of the resistor R, the voltage between the lines 30 and 31 becomes V12. This voltage V12 is the comparator circuit M of the base unit 20.
This is an intermediate value between the voltages V1 and V2 applied to V1 and M2. Therefore, the output terminals of comparison circuits M1 and M2 both become high level. Therefore, this high level signal is applied from the diode D3 to the input terminal 23 of the triac drive circuit 52, and the conduction angle of the triac 21 is controlled. At the same time, the output terminal 22 becomes high level.
Transistor Tr3 is therefore conductive, so that the voltage between lines 30 and 31 becomes the corresponding voltage V23 of Zener diode Z23. Therefore, the Zener diode Z1 of the handset 32 is cut off.
Transistor Tr2 becomes conductive, thereby lighting light-emitting diode LD2. The lighting of the light emitting diode LD2 indicates that the lighting lamp 2 is in a lighting state.

When you operate the up switch 44 of the handset 32,
The voltage between lines 30 and 31 is the Zener diode Z
The voltage V34 corresponds to V34. This voltage V3
4 is V in the level discrimination means 33 of the base unit 20.
The value is between 3 and V4. Therefore, the comparison circuit M
3, the output terminal of M4 becomes high level. As a result, a high level signal is applied to the input terminal 24 of the triac drive circuit 52 via the diode D5. Therefore, during the conduction period of the up switch 44, the conduction angle of the triax 21 changes to become larger.

When you operate the down switch 45 of the handset 32,
Zener diode Z45 conducts, line 30,
The voltage between 31 and 31 becomes V45. Therefore, a high level signal is applied from the comparison circuits M4 and M5 to the input terminal 25 of the triac drive circuit 52 via the NOR gate 41 and the diode D6. Therefore, during the period when the down switch 45 is operated,
The conduction angle of the triax 21 changes gradually.

The conduction angle of the triax 21 is controlled,
When the on/off switch 43 is operated while the lighting lamp 2 is on, the Zener diode Z
56 conducts and the voltage between lines 30 and 31 is V5
It becomes 6. Therefore, the high level signal from the comparison circuit M6 is applied to the input terminal 23 of the triac drive circuit 52 from the diode D4. In this way, the triac drive circuit 52 drives the triac 2
1 remains shut off. Therefore, when the operation of the on-off switch 43 is stopped and the on-off switch 43 is turned off, the voltage between the lines 30 and 31 returns from V56 to the voltage V01 corresponding to the Zener diode Z01.

Due to the function of the constant current circuit 60, even if the Zener diode Z56 with a low breakdown voltage V56 becomes conductive, an excessive current will not flow through the lines 30 and 31, and the Zener diode Z12 with a high breakdown voltage V12 will not flow. This prevents a situation where only a small amount of current flows. Therefore, the level discrimination means 33 can operate accurately.

The operation of turning off the illuminating lamp 2 by operating the on-off switch 43 of the handset 32 in a state where the energizing angle of the triax 21 is controlled and the illuminating lamp 2 is turned on will be described. On-off switch 43
When conductive between times t1 and t2 in FIG. 5, the voltage between lines 30 and 31 becomes voltage V56 corresponding to Zener diode Z56. As a result, the output of the comparison circuit M6 becomes high level, and the voltage of the capacitor C is charged and rises as shown in FIG. 52. Thus, at time t3 when the output voltage of the capacitor C exceeds the discrimination level l1 of the inverter 74, the output of the inverter 74 becomes low level. Therefore, after a short time W1 between time t1 and time t3, the comparison circuit M
The output terminals of M1 and M2 are forced to a low level as shown in FIG.

At time t2, when the operation of the on-off switch 43 is stopped and the on-off switch 43 is turned off, the voltages on the lines 30 and 31 become the voltage V01 corresponding to the Zener diode Z01. At this time, the output terminal of the comparison circuit 6 becomes a low level, and accordingly, the output terminal 72 of the buffer 71 becomes a low level. Therefore, inverter C is resistor R31
discharge slowly through the After time W2 has elapsed from time t2, the voltage of capacitor C becomes less than the discrimination level l1 of inverter 74, thereby releasing the compulsion of the outputs of comparator circuits M1 and M2 to the low level. Therefore, from time t2 to time W2
After the elapsed time t4, the comparison circuits M1,
The output from the output terminal of M2 provides a high level signal to the input terminal 23 of the triac drive circuit 52 via the diode D3. Therefore, the triax 21 is cut off.

In this way, when the conduction angle of the triac 21 is controlled and the illumination lamp 2 is turned on, when the conduction angle is set to zero and the illumination lamp 2 is turned off, the on/off switch 43 is operated to turn on the illumination lamp 2. ,
After that, the time W starts from time t2 when the hand is removed and the interruption is interrupted.
The outputs of the comparison circuits M1 and M2 are held at low level by 2. By this, line 30,
31 are long and therefore their stray capacitance is large, it may happen that the voltage between lines 30, 31 changes slowly from a low voltage V56 to a high voltage V01. Therefore, the time W is longer than the delay time of the signal to the level discrimination means 33 due to the stray capacitance of the lines 30 and 31.
The output terminals of the comparator circuits M1 and M2 are set to low level and disabled by 2, thereby preventing the triac drive circuits 3 and 52 from malfunctioning. After the voltage between lines 30 and 31 reaches voltage V01 after a period of time less than time W2 has elapsed from time t2, the compulsion of the output terminals of comparator circuits M1 and M2 to low level is released and level discrimination means 33 is activated. By doing so, the comparator circuits M1 and M2 can accurately discriminate the level of this voltage V01.

The buffer 71 in the disabling means 70 is connected to the resistors R31 and R32 regardless of the value of the resistor R15.
(However, R31>R32) can be arbitrarily selected.

On-off switch 3 provided on the base unit 20
8. Up switch 39 and down switch 4
Even if 0 is operated, the triac drive circuit 52
controls the conduction angle of the triax 21.

The triax drive circuit 52 is the triax 21
When the output terminal 22 is at a low level with the circuit cut off, the voltage between the lines 30 and 31 is the voltage V01 corresponding to the Zener diode Z01, and therefore the up switches 39 and 44 and the down switches 40 and 45 are Even when operated, the voltage between lines 30 and 31 does not change, and accordingly, the voltage at input terminals 24 and 25 does not change. This is convenient because after controlling the conduction angle of the triac 21 and turning on the illumination lamp 2, the same brightness as before the illumination lamp 2 is turned off can be obtained. A plurality of cordless handsets 32 may be connected to the lines 30 and 31.

Although in the embodiment described above, the level discrimination means 33 includes resistors R1 to R7 and comparator circuits M1 to M6, in another embodiment of the present invention, the level discrimination means 33 includes the lines 30,
The level discrimination may be performed by detecting the voltage of 31, or may be realized by other configurations.

The present invention is not only implemented for dimming, but can also be widely implemented for delaying loads connected in connection with a master unit.

Effects As described above, according to the present invention, signals expressed by mutually different voltages are given to the level discrimination means provided in the base unit through a pair of lines, and the level discrimination means provided in the base unit can be controlled. In addition, the configuration of the parent unit and slave unit is different from the configuration in which a modulated signal is superimposed on the power line for supplying power, as described in relation to the prior art described above.
It can be extremely simplified.

Further, according to the present invention, since the level discrimination means is disabled for a time longer than the delay time of a change in the signal from the handset due to stray capacitance between lines, Even if the signal from the slave unit changes slowly, the load can be controlled accurately.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the prior art, FIG. 2 is an electric circuit diagram of an embodiment of the present invention, and FIG. 3 is a comparison circuit M.
1, the simplified block diagram of FIG. 4 shows the voltage V1~
Diagram showing the magnitude relationship of V6, V01 to V56, fifth
The figures include waveform diagrams to explain the operation. 1...Power supply, 2...Lighting light, 20...Base unit, 2
1...Triack, 30, 31...Line, 3
2...Slave unit, 33...Level discrimination means, 38,4
3...On-off switch, 39, 44...Up switch, 40,45...Down switch, 52
... Triac drive circuit, 60 ... Constant current circuit, 70 ... Disabling circuit, Z01 to Z56, Z
1...Zena diode, M1 to M6...comparison circuit.

Claims (1)

[Scope of Claims] 1. A parent device and a slave device are connected via a pair of lines, and the parent device includes: a power source that applies a voltage between the lines; a level discrimination means that discriminates the level of the voltage between the lines; A means provided in connection with the level discrimination means, for disabling the level discrimination means for a time longer than the delay time of a change in the signal from the slave unit due to stray capacitance between the lines; A control device for controlling a load so that the load is in an operating state corresponding to the voltage between the lines in response, and the slave device includes a means for changing the voltage between the lines. 2. Claim 1, wherein the power source maintains the current flowing through the line at a predetermined value.
Control device as described in section.