JPS59139781A - Controller - Google Patents

Abstract

PURPOSE:To decrease the number of lines and to simplify the constitution for a control circuit by providing a constant current circuit containing a resistance, a transistor and a Zener diode between lines. CONSTITUTION:The electric power of a power supply 1 is rectified 26 and smoothed 57, and the prescribed voltage VA decided by a transistor (TR)4 and a Zener diode ZA is applied to a line 27. At the same time, a TR5, a Zener diode Z23 and a TR3 are connected to the line 27. The TR3 is energized when an output terminal 22 of a TRIAC driving circuit 52 is set at a high level. A constant current circuit 60 is set between the TR5 and lines 30 and 31. The electric power supplied from the circuit 60 is supplied to the terminal 22 from the lines 30 and 31 connected to outside from a line 28. In such a way, the number of lines is decreased with a simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical details The present invention provides a control device 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 units. Regarding.

Prior Art FIG. 1 is an electrical circuit diagram of the prior art. This light control device adjusts the conduction angle of a lighting lamp 2 powered by a power source 1 such as a commercial AC power source using a triac 4 provided in a base unit 3.
Light control can be performed by controlling the 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. including. Such a switch 5゜6.7
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 has too many lines 8. Therefore, it is desirable to reduce the number of lines 8.

Another prior art technique that can reduce the number of lines is to connect the power line that supplies power from the parent device to the slave devices by
For example, it is configured to superimpose a signal that has been subjected to pulse modulation or the like. Such prior art has a complicated structure, and a simple structure is desired, especially when the number of signals to be transmitted is relatively small, such as in a light control device.

the purpose The purpose of the present invention is to reduce the number of lines and to improve the structure.

An object of the present invention is to provide a control device that can simplify the process.

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 triac 21 provided in a base unit 20. triac 21
The illumination lamp 2 is dimmed by controlling the conduction angle of the illumination lamp 2. Triac drive circuit 52 has an output terminal 22.

The output terminal 22 is at a high level when the triac 21 is in the on state where the conduction angle is controlled and power is supplied to the illuminating lamp 2, and when the illuminating lamp 2 is not being supplied with power, the output terminal 22 is at a high level.
It even reaches the low level. This triac drive circuit 5
2 has three input terminals 23.24.25. Each time the input terminal 23 becomes high level, the triac 21
The conduction is controlled or the arc extinguishing side is controlled. 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 duration of the high-level signal, and finally 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 duration of the high level signal.
Eventually, the conduction angle remains at a predetermined small value, or finally the conduction angle becomes zero.The power from the power source 1 is full-wave rectified and smoothed by the rectifier circuit 26 and the capacitor 57, and the line 27 is connected to a transistor. A predetermined voltage VA determined by Tr4 and Zener diode ZA is applied. A transistor Tr5, a Zener diode Z23, and a transistor Tr3 are connected to the line 27. This transistor T
r31tj', becomes conductive when the output terminal 22 of the triac drive circuit 52 becomes high level. A constant current circuit 6 is connected between the transistor Tr5 and the line 30.31.
0 is interposed. This constant current circuit 6o includes a resistor R60, a transistor Tr6, and a Zener diode ZO1, and maintains the current flowing through the line 30, 31 at a predetermined value. Power from the constant current circuit 6o is connected to the slave device 32 through a line 30.31 connected to the outside from the line 28.

The level discrimination means 33 includes resistors R1 to R7 that divide the voltage of the line 27, and comparison circuits M1 to M8. Line 281d is connected to one input of comparison circuits M1 to M6. The voltage divided by the resistors R1 to R7 is applied to the other input terminals of the comparison circuits M1 to M6.

@: Figure 3 is a simplified block diagram of the comparison circuit M1. This comparison circuit Ml includes a so-called oven collector type transistor 34. When the voltage at the non-inverting input terminal 35 is higher than the voltage at the inverting input terminal 36, the transistor 34 becomes conductive and its output terminal 37 becomes low level. When the voltage at non-inverting input terminal 35 is less than the voltage at inverting input terminal 36, transistor 34 is cut off and the output impedance of output terminal 37 is high. Although the remaining comparison circuits M2 to M6 still have the same configuration, the connection mode of their pair of input terminals is that of comparison circuit M.
2, M4, and M6 are opposite to the comparison circuit M1. The output terminals of comparison circuits M1-M6 are connected in relation to resistors R11-R14 and diodes DI, D2. Comparison circuits Ml, M2. M6 is also a diode D3. D4 and the diodes D3. An on/off switch 38 is connected to D4. Diode D3. D
The input terminal 23 is connected to the connection point between the switch 4 and the switch 38 . The output terminal of the comparison circuit M3 is connected to the up switch 39 and to the input terminal 24 via a diode D5. Comparison circuit M4. The output of M5 is given to NOR gate 4]. 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.

In the handset 32, an on/off switch 43 and a Zener diode Z12 are connected in series to the line 30.31. At the connection point between the on-off switch 43 and the Zener diode z12, a diode D7 connected in the forward direction,
A Zener diode Z56 connected in reverse polarity is connected in series. Zener diode Z56 is connected to up switch 44 and down switch 45, respectively. Zener diode Z34. Each series circuit consisting of Z45 is connected in parallel, and a light emitting diode LD2 for display is also connected. Line 35 is resistor R21
and the Zener diode Z1 through the transistor Tri.
connected to the base of

A light emitting diode LDI for display is connected to this transistor Tri, as well as a series circuit of a resistor R23 and a diode D8. The connection point between the resistor R23 and the diode D8 is connected to the base of the transistor Tr2 via a diode D9. Transistor Tr
2 is Line 31 Seven Zena Tiode Z56. Z, 44
．． It is connected to the connection point with Z45 via a diode DIO.

Referring to FIG. 4, Zener diode ZOI.

Zl, 2. Z23. Z34. Z45 o, 1: and Z56's play 1 tau:/”i pressure VO1, Vl 2, V23
, V34, V4.5. V565: Ravi comparison circuit M
Voltage V due to voltage dividing resistors R1-R7 applied to l to M6
1 to v6 are resisted as shown. The breakdown voltage VA of the Zener diode ZA is chosen equal to the voltage V2.

Assume that the triac 21 is in the cutoff state. At this time, the output terminal 22 is at a low level "it", so the transistor Tr3 is cut off. The voltage between lines 30, 31 is therefore the voltage VOI, which corresponds to the Zener diode ZOI. At this time, Zener diode Z
1 is conducting, so the transistor T r 1
is 141. , the light emitting diode LDI lights up. The lighting of the light emitting diode LDI 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 Vl2. This voltage V12
is the voltage V applied to the comparison circuits M1 and M2 of the base unit 20
1. It is an intermediate value of V2. Therefore, the comparison circuit Ml
, M2's output terminals are both at the NO level. Therefore, this signal at the NO level is applied from the diode D3 to the input terminal 23 of the triac drive circuit 520, and the conduction angle of the triac 21 is controlled. At the same time, the output terminal 22 becomes a no-y level.

Transistor Tr3 is therefore conductive, so that the voltage across line 30.31 becomes the corresponding voltage V23 of Zener diode Z23. Therefore, the Zener diode Z1 of the handset 32 is cut off.

The transistor Tr2 becomes conductive, thereby lighting up the light emitting diode LD2. The lighting of the light emitting diode LD2 indicates that the illuminating lamp 2 is in a lighting state.

When the up switch 44 of the handset 32 is operated, line 3
The voltage between 0.31 and 0.31 becomes the voltage V34 corresponding to the Zener diode 234. Since this voltage v34 is a value between V3 and v4 in the level discriminator 33 of the base unit 20, the output terminals of the comparator circuits M3 and M4 are at the NO level. As a result, the signal of the signal leaks to the input terminal 24 of the triac drive circuit 520 via the diode D5. Therefore, the conduction 101 of the up switch 44
During this period, the conduction angle of the triac 21 changes to become larger.

When the down switch 45 of the handset 32 is operated, the Zener diode Z45 becomes conductive, and the voltage between the lines 30 and 31 becomes V45. Therefore, the comparison circuit M4. M5 to NOR
A high level signal is applied to input terminal 25 of triac drive circuit 52 via gate 41 and diode D6. Therefore, while the down switch 45 is being operated, the conduction angle of the triac 21 is controlled so that the conduction angle of the triac 21 changes small, and the lighting lamp 2
When the on/off switch 43 is operated while the line is lit, the Zener diode 256 becomes conductive, and the voltage between the lines 30 and 31 becomes VS2. 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
On-off switch 4 that leaves 1 in the cut-off state
When the operation of step 3 is stopped and the on/off switch 43 is turned off, the voltage between the lines 30 and 31 returns from VS2 to the voltage Vo1 corresponding to the Zener diode 201.

Due to the function of the constant current circuit 6o, even if the Zener diode Z56 with a low breakdown voltage and voltage V56 is turned on, an excessive external current will not flow through the line 30.31, and the Zener diode Z1 with a high breakdown voltage V12 will not flow.
This prevents a situation where only a small current of 2 VC flows. That useless level. The operation by the discrimination means 33 can now be performed accurately.

Even if the on/off switch 38, up switch 39, and down switch 40 provided in the base unit 20 are operated, the triac drive circuit 52
control the conduction angle of

When the triac drive circuit 52 cuts off the triac 21 and the output terminal 22 is at a low level, the voltage between lines 30 and 31 is
Therefore, even if the up switch 39.44 and the down switch 40.45 are operated, the voltage across the line 30.31 will not change, and accordingly the voltage at the input terminal 24.25 will be It does not change. This is convenient because after controlling the conduction angle of the triac 21 and turning on the illuminating lamp 2, the same brightness as before the illuminating lamp is turned off can be obtained. A plurality of cordless handsets 32 may be connected to the lines 30 and 31.

In the above embodiment, the level discrimination means 33 includes resistors R1 to R
7 and comparator circuits M1 to M6, as another embodiment of the present invention, the voltage on the lines 30 and 31 may be detected and level discriminated by a breakdown operation using a Zener diode, or other configurations may be used. May be realized.

The present invention can be widely implemented not only for dimming, but also for controlling loads connected in connection with a base 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 parent device by a pair of lines, and the load provided in the parent device is controlled. be able to. Furthermore, the configuration of the base unit and slave unit can be extremely simplified compared to the configuration in which a modulated signal is superimposed on the power line to which power is supplied, as described in connection with the prior art described above. . In particular, according to the present invention, the current flowing through the line is maintained at a predetermined value, thereby stabilizing the operation. Even if the line is short-circuited, no excessive current will flow.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the prior art, FIG. 2 is an electric circuit diagram of an embodiment of the present invention, FIG. 3 is a simplified block diagram of the comparator circuit M1, and FIG. 4 is a block diagram of the voltages Vl to V6, VOI～V5
FIG. 6 is a diagram showing the symmetrical relationship of No.6. 1...Power supply, 2...Lighting light, 20...Base unit, 21
...Triac, 30.31...Line, 32.
...Slave unit, 33...Level discrimination means, 38.43...
・On, off switch, 39.44... Up switch, 40° 45... Down switch, 52... Triac drive circuit, 60... Constant current circuit, Z O1
~Z 56. Z]...Zena diode, M1~
M6... Comparison circuit agent Patent attorney Saikyo Hakubu Part 4 Parent Sugi 120 (Im) + Talent committee ← 32
Procedural amendments to the Commissioner of the Patent Office 1. Indication of the case Patent application 1982-13582 2. Name of the invention control device 3. Person making the amendment Relationship with the case Applicant address name (5'83) Representative of Matsushita Electric Works Co., Ltd. 4. Agent address: 1-13-38 Nishihonmachi, Nishi-ku, Osaka Shinkosan Hill International FAX GIII&Gl] ((+6)538-
02476, Column 7 of the detailed description of the invention in the specification to be amended, Contents of the amendment (1) In pz, on page 5, line 20 of the specification, the word "conduction" is corrected to "blocking"0 ( 2) "Low level" in the first line of page 6 of the specification
Correct the statement to "high level". (3) In page 6, line 3, number A of the specification, correct the word "blocking" to "conducting." (4) In the specification (page 6, line 4), the phrase "high 1/)" is corrected to "low". (5) On page 8, line 11 of the specification, "ZA" in l/) is corrected to "Zl". that's all

Claims (1)

[Claims] A master unit and a slave unit are connected via a pair of lines, and the master unit includes a power supply that applies a voltage between the lines and maintains the current flowing through the line at a predetermined value; a level discriminator for level discriminating the voltage between the lines; r(((
a control device for controlling a load so that the load is in an operating state corresponding to the voltage, and the slave device includes a device for changing a voltage between lines.