JPH0443997Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a device for setting and storing the dimming level of a lighting load, for example in a memory.

Prior Art A typical prior art is shown in FIG.
The plurality of lighting loads L1 to Ln are driven by drive circuits DR1 to
The power is energized under phase control by DRn, and the illumination is performed at a brightness corresponding to the dimming level. In order to set this dimming level, each lighting load L1~
Level setters R1 to Rn, which are variable resistors, are provided for each channel CH1 to CHn of Ln. The output from these variable resistors R1 to Rn is the switch S
The signal is applied from line 1 to analog/digital conversion circuit 2 via lines 1 to Sn, where it is converted into a digital value, and is applied to processing circuit 3 realized by a microcomputer or the like. The control circuit 4 sequentially controls the switches S1-Sn so that one of the switches S1-Sn becomes conductive.
Thus, for example, a signal representing the dimming level set in the level setter R1 is transmitted to the switch S1.
When one switch S1 of ~Sn is conductive, it is applied to the analog/digital conversion circuit 2 via line 1, converted into a digital value, and stored in the memory provided in the processing circuit 3. . Based on the contents stored in the processing circuit 3, the drive circuit DR1 drives the lighting load L1, and the lighting load L1 is dimmed at the dimming level set by the level setter R1.

In the prior art shown in FIG. 5, for example, when the switch S1 is switched from a conductive state to a switch S2 conductive state, the value set in the level setter R1 is changed to the remaining level setter R2. There is a problem that the values set in .

Another prior art solution to this problem is shown in FIG. 6, where corresponding parts are given the same reference numerals. The level setters R1 to Rn are provided with transistors Q1 to Qn in series, and the control circuit 4 sequentially turns on one of these transistors Q1 to Qn. Level setter R1~
In order to prevent mutual interference of Rn, diodes D1 to Dn are connected in series to the outputs of these operating pieces, and the cathodes of these diodes D1 to Dn are commonly connected to line 5. Line 5 is resistance R
05 and is pulled down, and is applied to the analog/digital conversion circuit 2 through an impedance conversion circuit 6 having an operational amplifier, where it is converted into a digital value, and the digital value is applied to the processing circuit 3.

Problems to be Solved by the Invention The first problem shown in FIG. 6 is poor responsiveness. Diode D1~
Dn has a capacitance, and line 5 has a stray capacitance. Due to this capacitance, transistors Q1, Q2, and
When . . . is sequentially conducted, the level setter R
1, R2, . . . to the impedance conversion circuit 6 through the line 5, the signal is distorted, that is, rounded, at the portion indicated by reference numeral 8, as shown in FIG. 72. This reduces the response speed. To improve this response speed,
As described above, the pull-down resistor R05 may be provided and the resistance value of this resistor R05 may be reduced to improve the charging/discharging speed of the capacitance, but if this is done, the following second problem will occur.

The second problem shown in FIG. 6 is that the voltage applied to the impedance conversion circuit 6 by the resistor R05 in response to the amount of displacement of the operating piece to which the diode D1 of the level setter R1 is connected is linear. However, as shown in FIG. 8, the characteristics become worse. If the resistance value of this pull-down resistor R05 becomes small, the characteristics shown by lines 1 and 2 will be obtained, and the desired linear characteristic 3 cannot be obtained. The resistance of the line 5 also promotes such nonlinear characteristics.

An object of the present invention is to provide a dimming level setting device that improves response speed and has linear characteristics between the amount of operational displacement of the output from the level setter and the dimming level.

Means for Solving the Problems The present invention comprises: a lighting load; a switching means provided for each lighting load and sequentially turned on; A series circuit in which a level setter that sets a dimming level that is an output between the potential and a diode and a first resistor are connected in series, and one end is connected in series to the output of the level setter. a resistor connected between the other end of the series circuit and the first potential or the second potential, the resistor being smaller than the first resistor; A dimming level setting device comprising: a second resistor having a value; and means for reading a potential near the second resistor at a connection point between the first resistor and the second resistor.

Effect According to the present invention, a series circuit consisting of a diode and a first resistor is connected in series to the output of the level setting device, and a second resistor is connected in parallel to the output end of this series circuit. , this second resistor has a smaller resistance value than the first resistor, and the potential is read in the vicinity of the second resistor. By setting the resistance value of the second resistor small, the charging and discharging speed of the capacitance of the diode and the capacitance of the conductor line between the series circuit and the second resistor is increased, and the response speed is increased. You can improve your performance.

By setting the resistance value of the first resistor to a large value, it is possible to achieve linearity between the set operation displacement amount of the level setter and the potential read by the reading means. The first resistor can be provided near the level setter to lengthen the low impedance region provided by the second resistor, thereby further improving the response speed.

Embodiment FIG. 1 is a block diagram of an embodiment of the present invention. The plurality of lighting loads L1 to Ln are driven by a drive circuit DR1.
~ Phase controlled and power energized by DRn,
The light is turned on at a brightness corresponding to the dimming level set by the level setters R21 to R2n.

The level setting device R21 is a variable resistor, and an operating piece 13 is slidably contacted between one end 11 and the other end 12 of the resistor 10 to be manually displaced. resistor 1 between
The resistance value of 0 is configured to vary linearly. The other level setters R22 to R2n are also configured in the same manner. Level setter R21~R2n
are provided individually corresponding to the channels CH1 to CHn of the lighting loads L1 to Ln. Switching transistors Q1 to Qn are connected in series to these level setters 21 to R2n, and these switching transistors Q1 to Qn are connected to the control circuit 1.
5, only one of them is controlled to conduct in sequence. Switching transistors Q1-Qn are connected to line 16 to
Potential Vcc is applied. Level setting device R21~R
2n is grounded, which is a second potential.

The operating piece 13 of the level setter R21 includes a series circuit 17 consisting of a diode D1 and a first resistor R1.
is connected. Other level setting devices R22~R
2n as well, diodes D2 to Dn and first resistors R2 to Rn are connected in the same way. Series circuit 17
is connected to the conductor line 18. This line 18
is connected in parallel to a pull-down resistor R01, which is a second resistor, and this resistor R01 is connected to the ground potential. Similarly, resistors R2 to Rn are also commonly connected to line 18. In the vicinity of the connection point 19 between the line 18 and the resistor R01, there is an impedance conversion circuit 20 that constitutes a part of the reading means.
is connected. This impedance conversion circuit 20
has an operational amplifier circuit 21, a resistor R03 connected to its input terminal, and a resistor R04 connected to a feedback loop. Impedance conversion circuit 20
The output is applied to an analog/digital conversion circuit 21, converted into a digital value, inputted to a processing circuit 23 realized by a microcomputer, etc., and stored in a memory provided therein. The resistance values of the first resistors R21 to R2n are equal;
This resistance value is set equal to the resistance R04 of the impedance conversion circuit 20. The resistance value of the resistor R01 is the resistor R0 of the impedance conversion circuit 20.
is set equal to the resistance value of 3. As a result, the impedance conversion circuit 20 derives an output that maintains the linearity of the voltage applied from the connection point 19.

The operation will be explained with reference to FIG. Processing circuit 2
3 operates the control circuit 15 to sequentially turn on the transistors Q1 to Qn one by one as shown in FIG. With this, channel CH1~
A signal representing the dimming level of the level setters R21 to R2n of CHn is led out to line 18. Each channel CH1 to CHn obtained at connection point 19
The signal representing each dimming level is as shown in FIG. 2, and the processing circuit 23 is as shown in FIG.
At the time indicated by the arrow, the signal representing the dimming level of each channel is read and stored in the memory. As a result, based on the contents stored in the processing circuit 23, the drive circuits DR1 to DRn can energize the lighting loads L1 to Ln as described above to obtain brightness corresponding to the dimming level.

Diodes D1~Dn are connected to each channel CH1~
It functions to prevent mutual interference among the level setters R21 to R2n for each CHn. These diodes D1
The decrease in response speed due to the capacitance of ~Dn and the capacitance or stray capacitance of the line 18 and the lines between that line 18 and the resistors R1 to Rn is due to the 2
This is achieved by setting the resistance value of the resistor R01 to be smaller than the resistance values of the first resistors R1 to Rn.

Moreover, by setting the resistance values of the first resistors R1 to Rn provided near the level setters R21 to R2n to be larger than the resistance value of the second resistor R01, the second resistor R01 and Due to the resistance of the line 18 and the lines connected to the line 18 and the resistors R1 to Rn, dimming is obtained at the connection point 19 in response to the amount of displacement of the operating pieces 13 of the level setters R21 to R2n. Characteristics with good linearity with the voltage representing the level can be obtained. For example, level setter R21
It becomes possible to obtain a voltage at the connection point 19 that changes linearly between the one end 11 and the other end 12 of the resistor 10 in response to the amount of displacement of the operating piece 13.

FIG. 3 is an electrical circuit diagram of another embodiment of the present invention. Although this embodiment is similar to the previous embodiment, it should be noted that each level setter R21 to
Diode D of the series circuit connected to R2n
The order of connection between 1~Dn and the first resistors R1~Rn is as follows:
The embodiment of FIG. 1 is reversed. Such an embodiment can also achieve the same effects as the embodiment shown in FIG. 1 described above.

FIG. 4 is an electrical circuit diagram of still another embodiment of the present invention. In this embodiment, the level setter R21
Switching transistors Q1 to Qn are interposed on the ground potential side of R2n, and this configuration
Transistor Q1 in the embodiment of FIGS.
This is the opposite of the configuration in which Qn is provided on the potential Vcc side. A pull-up resistor R011 is connected to the line 8a at a connection point 19, and resistors R031 and R041 are connected to the impedance conversion circuit 21 in association with the operational amplifier circuit 21. The rest of the structure is similar to the previous embodiment, and corresponding parts are given the same reference numerals. First resistor R1~Rn and resistor R
041, and the second resistor R01 has the same resistance value.
1 and the resistance value of the resistor R031 are the same.
Also, compared to the resistance values of the first resistors R1 to Rn, the second
The resistance value of resistor R011 is selected to be small.

In the embodiments shown in FIGS. 1 to 3, the resistance value of the resistor 10 of the level setter R21 is represented by the same reference numeral R21, the resistance value of the first resistor R1 is represented by the same reference numeral R1, and When the resistance values of the two resistors R01 are expressed by the same reference numeral R01, by setting R21<<R1+R01 (1), it is possible to prevent the characteristics of the level setter R21 from deteriorating. This also applies to the remaining level setters R22 to R2n, and also applies to the embodiment shown in FIG.

Effects of the invention As described above, according to the invention, it is possible to achieve linearity between the operating displacement of the level setter and the dimming level, and to reduce the A decrease in response speed can be prevented, and a dimming level setting device with good responsiveness can be realized.

[Brief explanation of the drawing]

Fig. 1 is an electrical circuit diagram of one embodiment of the present invention;
The figures are diagrams for explaining the operation of the embodiment shown in Fig. 1, Fig. 3 is an electric circuit diagram of another embodiment of the present invention, and Fig. 4 is an electric circuit diagram of still another embodiment of the present invention. 5 is an electrical circuit diagram of the prior art, FIG. 6 is an electrical circuit diagram of another prior art, FIG. 7 is a diagram for explaining the operation of the prior art shown in FIG.
The figure is a diagram showing the characteristics of the prior art shown in FIG. L1~Ln...Lighting load, DR1~DRn...Drive circuit, R21~R2n...Level setter, Q1~
Qn...Switching transistor, D1~Dn...
...Diode, R1~Rn...First resistor, R01,
R011...Second resistor, 18, 18a...Conductor line, 17...Series circuit.

Claims (1)

[Scope of Claim for Utility Model Registration] A lighting load, a switching means provided for each lighting load and sequentially turned on, and a switching means provided individually corresponding to the lighting load and switching between a first potential and a second potential. A series circuit in which a level setter that sets the dimming level that is the output between the two, a diode and a first resistor are connected in series, one end being connected in series to the output of the level setter, and the other end being connected in series to the output of the level setter. such a series circuit, the ends of which are connected in common; and a series circuit connected between the other end of the series circuit and the first potential or the second potential and having a resistance value smaller than a first resistance. A dimming level setting device comprising: a second resistor; and means for reading a potential near the second resistor at a connection point between the first resistor and the second resistor.