JPH02239398A - Indicator dimming circuit - Google Patents

Abstract

PURPOSE:To make excellent the contrast between a light lamp and a dark lamp in the whole area to be dimmed, to use only a single power source and to improve a function and an economical effect by selecting the values of a current restricting resistance and a bypass resistance according to the lightness of a room. CONSTITUTION:When a driver 10 is turned on by a switch 1, a current applied to an LED 3 flows through a current restricting resistance 9 and the driver 10, and the LED 3 is lit up. In such a state, the output voltage of an externally set type DC power source 6 is changed by a dimming quantity setting device 5, and the lightness of the light lamp is changed. When the driver 10 is turned off by the switch 1, the current of the LED 3 flows through the resistance 9 and a bypass resistance 11, and dims the LED 3. Further the output voltage of the power source 6 is changed by the setting device 5, and the lightness of the dark lamp is changed. Thus by selecting the values of the voltage controlled resistance and the bias resistance, the contrast between the light lamp and the dark lamp in the whole area to be dimmed is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to the dimming of an indicator with a built-in switch mounted on a control table for driving and operating an 81 machine, device, or system.

[Conventional technology]

FIG. 3 is a diagram showing a conventional indicator dimming circuit. (1) is an indicator with a built-in switch and LED,
(2) is a switch, (3) is an LED, (41 is a switch interface, (5) is a dimming amount setting 11161 is an external setting type DC that can change the output voltage by the signal from a dimming amount setting device. (7) is a second external setting type DC power supply whose output voltage can be changed by the signal from the dimming amount setting device, and (8) is the external setting type DC power supply by the signal from the switch.
A switch (9) is a current limiting resistor for switching between the output of the power source (6) and the output of the second externally set DC power source (7).

The output of the external setting type DC power supply (6) is set to the second external setting type DCTi over the entire output level of the dimming amount setting device (5).
By making the output larger than the output of the external setting type DCW source (7), the external setting type DCW source (6) can be used as a power source for bright lights and a second external setting power source (
7) becomes the m source for dark light.

This conventional indicator dimming circuit is used and operates as follows.

When the switch (2) is turned on, if the target machine, device, or system starts a predetermined operation due to this signal, the LED D (31
is connected to the external setting type DC power source (7) using the switch (9) to turn on the light.If the room where the control console is installed with this indicator (1) is bright, it means that the indicator (1) is brightly lit. In this case, increase the output of the dimming amount setting device (5) and turn on the LED (3) strongly.If the room is dark when the light is on, the indicator will cause halation, or if this room is a theater. If so, it may affect the image being projected.In this case, lower the output of the dimming amount setting device {5} and set the L E D (31
Reduces the amount of light. If the operator tries to turn on the switch (2) from OFF to ON in order to operate the desired machine, device, or system in a pitch-dark room, but does not know where the indicator (1) is, the operator will be left groping and cannot perform the next operation immediately. It may happen that you cannot move on. To avoid such cases, it is necessary to keep the indicator in a dark state at all times.

Note that a variable resistor with a knob is often used for the dimming amount setting (5), and is operated by the operator according to the brightness of the room.

[Problem to be solved by the invention]

The conventional indicator light control circuit is configured as described above and has the following problems. First, the external setting type DC power supply for bright lights and dark lights cannot output voltage according to a free function in response to the signal from the dimming amount setting device, so the contrast between bright lights and dark lights can be adjusted depending on the brightness of the room. This means that it cannot be maintained well over the entire area.

The second problem is that two externally set DC power supplies are used, which is uneconomical.

This invention attempts to solve the above problems.

[Means to solve the problem]

The indicator light control circuit according to the present invention solves the above problems by connecting the output of an external setting 9DCri source that can change the output voltage according to the signal from the light control amount setting device to the LED of the indicator. The other end is connected via a current limiting resistor to a driver that is turned on and off by an indicator switch, and a bypass resistor is connected to the same driver. When the light is on, the driver is turned on and current flows through the driver, and when the light is dark, the driver is turned on and current flows through the driver. The circuit configuration is such that the driver is turned off and current flows through the bypass resistor.

In order to solve the problem, the other indicator light control circuit according to the present invention includes two arithmetic units that can output free function data according to the signal from the light control amount setting device, a clock circuit, and a clock circuit that is turned on by the same clock. Two timers that turn off at the timing instructed by the data output from the two arithmetic units? An AND circuit that ANDs the signal from one timer output and the indicator switch, an OR circuit that ORs the output of the AND circuit and the other timer output, and a drive circuit that drives the indicator LED with the OR output. It has a circuit configuration that realizes bright lighting and dark lighting by changing the duty of energizing the LED within one clock cycle.

[For production]

The indicator dimmer circuit according to the present invention adjusts the contrast between bright light and dark light in a room by selecting the resistance values of two resistors: a current limiting resistor connected in series with the driver and a bypass resistor connected in parallel with the driver. In addition to being able to better maintain brightness across the entire brightness range, only one externally set DC power supply is required since current is passed through the driver for bright lights and current is passed through the bypass resistor for dark lights.

Another indicator light control circuit according to the present invention attempts to realize bright light and dark light by changing the energization duty of the LED within one clock cycle, and the method of changing this duty is based on the light control amount setting gain. By using a system that allows the output signal of DCf to be controlled as a free function using a computing unit, the contrast between bright light and dark light can be maintained perfectly over the entire brightness range of the room. fffi requires only one power supply that outputs a constant voltage.

〔Example〕

FIG. 1 is a diagram showing an embodiment of an indicator dimming circuit according to the present invention, in which an indicator (1), a switch (
21, L E D (31, Switch Interface (
4), Light control amount setting (5), External setting type DC power supply (6)
, the current limiting resistor (9) is the same or equivalent to the dimming circuit of a conventional indicator. QOI is a driver that is turned on and off by a signal from the switch interface (4), and 01) is a bypass resistor connected in parallel with the driver. When driver 001 is turned on by operating switch (1), L E D (current flowing through 31 passes through current limiting resistor (9) and most of it is driver 00)
The flow changes to L E D (31).In this state, by operating the dimming amount setting device (5), the external setting type DCi
The brightness of the light can be changed by changing the output voltage of the source (6). When the driver alarm is turned off by operating the switch (1), the current of the LED (3) is controlled by the current limiting resistor (
9) and flows to the bypass resistor 01) L E D f3
] Dim the lights.

In this state, you can change the output voltage of the external setting type DC power supply (6) by operating the dimming light setting # [51] to change the brightness of the dark light. The contrast between bright light and dark light in conventional indicator dimmer circuits is mainly due to the evening setting type DC.
Contrast with the brightness of the room cannot be maintained freely because it depends on the maximum output voltage and output curve of the power supply.In contrast, in the indicator dimmer circuit according to the present invention, the contrast between bright light and dark light is mainly controlled by the current limiting resistor. (9) and the bypass resistor (II), and the resistance value itself has a wide variety, making it easier to maintain the contrast between bright and dark lights than with conventional indicator dimming circuits.

Furthermore, since the circuit is such that current is passed through the driver 00) for bright lights, and current is passed through the bypass resistor θ1) for dark lights, only one externally set DC power supply is required.

FIG. 2 is a diagram showing an embodiment of a dimming circuit for other indicators according to the present invention, which includes an indicator (1), a switch (2+, L E D (31), a switch interface (4), a dimming amount setter ( 5), Current limiting resistance (9)
1 indicates a part that is the same as or equivalent to the dimming circuit of a conventional indicator, and a driver (101) indicates a part that is the same or equivalent to the dimming circuit of the indicator according to the present invention.

■Is it a DC for LED f31? llS source, (■ is an arithmetic unit 1 that performs calculations based on the signal from the dimming amount setting device (5) and outputs data, and (b) is an arithmetic unit that performs calculations based on the signal from the dimming amount setting device (5). Arithmetic units 2 and 09 are clock generators that output data different from ■, and (16a) is a clock generator (the output is turned on at one rising edge)
(16b) is a clock generator (16b) that turns on the output at the rising edge of clock generator (19) and turns off the output at the timing instructed by the data of the arithmetic unit 2 (self); (r?) is the output of the switch interface (4) and the timer (16 &)
An AND circuit that ANDs the output of (the bad one is an AND circuit) that ORs the output of
It is a circuit.

Operation N1 (■ output data is the switch interface (
When the output of 4) is "1", that is, on, determine the on time of driver 〇〇}. That is, the clock generator (19
Determine the energization duty during one cycle of the output. Similarly, the output data of the arithmetic unit 204) determines the energization duty when the output of the switch interface (4) is "0", that is, OFF.

Therefore, by using the output data of operation @8 1 03) as the function data for bright lights, and by using the output data of operation 2 (2) as the function data for dark lights, the operation of switch (1) It is possible to control bright and dark lights.

Arithmetic unit 1 (13) and arithmetic unit 2 (b) are equipped with functional calculations or data tables that optimize the contrast between bright light and dark light, and this is realized using a small microcomputer or digital circuit. can.

As described above, the other indicator dimmer circuit according to the present invention can maintain the contrast between the bright light and the dark light in a perfect form over the entire area to be dimmed depending on the brightness of the room, and also allows the dimming method to be adjusted. Since it is a method that changes the duty of energizing, only one power supply is required, not a variable voltage type but a fixed voltage type.

〔Effect of the invention〕

As described above, the indicator dimming circuit according to the present invention can better maintain the contrast between bright lights and dark lights in the entire area where the dimming is desired depending on the brightness of the room by selecting the values of the current limiting resistor and the bypass resistor. In addition to this, only one externally set DC power supply is needed, improving functionality and achieving economical benefits.

In addition, another light control circuit according to the present invention prepares two computing units that can perform free function calculations or generate data, and uses one for bright lights and the other for dark lights to control the energization duty of the LED. It is possible to maintain the perfect contrast between bright lights and dark lights in the entire area where you want to adjust the brightness, and the power supply required is a fixed voltage DC? Only one Li source is required, improving functionality and providing economic benefits.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of a dimming circuit for an indicator of the present invention, FIG. 2 is a diagram showing an embodiment of a dimming circuit for another indicator of the present invention, and FIG. 3 is a diagram showing an embodiment of a dimming circuit for a conventional indicator. It is a diagram showing a dimming circuit. In the figure, (1) is an indicator, (2) is a switch, (3) is an LED, [41 is a switch interface,
(5) is a dimming amount setting device, (6) is an external setting type DC power supply,
(7) is the second external setting type DC power supply, (8) is the switch,
(9) is the current limiting resistor, α [is the driver, 01) is the bypass resistor, ■ is the DC power supply, 03) is the computing unit 1, (2)
is the arithmetic unit 2, (+!) is the clock generator, (16
a) is timer 1, (16b) is timer 2, (r
? ) is an AND circuit, (the cup is an OR circuit. The same reference numerals in the figures indicate the same or equivalent parts.

Claims (2)

[Claims] (1) The brightness of the LED or lamp of an indicator with a built-in switch and LED or lamp is lit brightly (bright light) when the switch is on, and dimly lit (dark light) when the switch is off. ), and the brightness of the bright light and dark light can be changed at the same time using a dimming amount setting device. It has an external setting type DC power supply to supply, a driver that drives the LED or lamp according to the switch signal, and a bypass resistor connected in parallel with the driver, and when the signal from the switch is on, the driver is turned on and the LED is turned on. Or turn on the lamp, and when the signal from the switch is off, turn off the driver and turn on the LED.
Or darken the lamp with the current flowing through the bypass resistor,
A dimming circuit for an indicator, characterized in that it is possible to dim the light while maintaining the relationship between bright light and dark light by changing the output voltage of the externally set DC power supply in response to a signal from the dimming amount setting device. (2) Set the brightness of the LED or lamp of an indicator that has a built-in switch and LED or lamp to be bright when the switch is on, dim when the switch is off, and set the amount of dimming. In an indicator dimmer circuit that can simultaneously change the brightness of a bright light and a dark light using a device, a calculator 1 receives a signal from a dimming amount setter and outputs first function data; an arithmetic unit 2 that outputs second function data that receives the signal as input; a clock generator that generates a clock at a predetermined period; a timer 1 that turns off the output at the timing when the
A timer 2 that turns on the output at the rising edge of the same clock and turns off the output at the timing specified by the second function data.
, an AND circuit that ANDs the output of timer 1 and the signal of the above switch, an OR circuit that ORs the output of the AND circuit and the output of timer 2, and the output of the OR circuit that outputs the signal from the above switch.
D or a driver for driving a lamp, a calculation such that the first function data becomes bright light data is incorporated into the calculation unit 1, and a calculation such that the second function data becomes dark light data is incorporated into the calculation unit 2. By incorporating the power into the LED or lamp, the duty of energizing the LED or lamp within one clock period can be changed between bright light and dark light, so that the LED or lamp is brightly lit when the switch is on, and the LED is lit when the switch is off. Alternatively, a dimming circuit for an indicator is characterized in that it dims a lamp and enables dimming while maintaining the relationship between a bright light and a dark light by a signal from a dimming amount setting device.