JPS58121592A - Dimmer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a light control device capable of controlling the light of a light source such as an incandescent light bulb step by step, for example, by operating a pull switch.

For continuous dimming of illumination light sources,
Conventionally, for example, there is a power variable control device disclosed in Japanese Patent Application Laid-Open No. 50-82864.

This device uses a 21 touch switch to control the charging and discharging of a capacitor through a neon discharge tube.
The photoelectric timing of the relaxation oscillator circuit including the N-gate silicon control ft1l rectifier is controlled by the capacitor connected to the input terminal of the insulated gate type α field effect transistor, and the output of the rooting circuit is directly controlled. It has a configuration in which the phase of the load is controlled by applying it to a bidirectional thyristor.

First, the dimming is controlled by using two touch switches, which is cumbersome to operate. Next, there is a drawback that fluctuations in the terminal voltage of the capacitor provided at the input end of the insulated gate type α-field infant transistor directly affect the load a. Although it is a successful transistor, it has the disadvantage that the terminal voltage of the capacitor gradually decreases over time.

This invention eliminates the above drawbacks and changes the number of clock pulses depending on the operating time of the operating switch.

By cyclically measuring clock pulses using a shift register, selecting a resistor according to the error, and generating a gate signal according to that resistor to dim the light, operation of the operation switch is easy and the light source is It is an object of the present invention to provide a light control device q that can accurately and stably control light.

An embodiment of the present invention will be described below with reference to the drawings.
(As shown in Figure 2-1, the main circuit of this dimming device connects one end of the AC power supply 1.s to a triac Q, and a full-wave circuit consisting of four diodes between the terminals of the phase AC power supply h2 and 1Lll). A rectifier Do is connected, and a parallel circuit of a constant voltage diode ZD1 and a capacitor CI of the illustrated polarity is connected between its output terminals via a resistor to constitute a first rectified constant voltage power supply.

Similarly, a parallel circuit of a constant voltage diode ZD2 and a capacitor C2 is connected between the output terminals of the full-wave rectifier Do via a resistor to constitute a second rectified constant voltage power supply.

Next, to explain the clock pulse generation circuit in the ignition phase control circuit, this circuit connects a resistor and a resistor between the terminals of a constant voltage diode ZD, and connects this series circuit to the operation switch and pull switch SW. A series circuit of a resistor and a capacitor Cs is connected through the resistor island and the capacitor C3, and the connection point of the resistor island and the capacitor C3 is connected to the anode of PUT QA, and the connection point of the resistors R3 and R4 is connected to the gate of P[JT Q, respectively.

It is constructed by grounding the cathode via a resistive island.

Next, the clear pulse generating circuit is constructed by connecting a capacitor C4 and a resistor in series between the terminals of a constant voltage diode ZD2.

In addition, as a shift register IC, for example, the internal circuit is D.
A static shift register can be used, which is constructed of a type flip-flop and an inverter, and is adapted to read data on the rising edge of a shift pulse applied to a clock terminal.

In the shift register IC shown in Fig. 1, (1) is the power supply V
DT) terminal, (2) is a data input terminal, (3) is a clear input terminal, (4) is a clock terminal, (5) to (8)
) indicates the Q+' to q' output terminals, and (9) indicates the ground terminal.

A plurality of resistors 11 having different resistances are provided, one end of which is connected to each output terminal Q+ of the shift register 16.The resistors 1 to 11 are used to set a stepwise firing phase. Each resistance value is selected so that the range of change in illuminance at each stage is visible.

Next, let me explain about the gate signal generation circuit.

Connect the other end of the resistor to the other end of resistor 1 and connect it to the signal terminal of the gate signal generator circuit. That is, the resistance
~a, F, transistor Q, , PUT Q, , capacitor C1l and transformer T [(by P[JT
A gate signal generation circuit is composed of a oscillation circuit.More specifically, a constant voltage diode Zl)
The resistor connected between the terminals of , and the connection point of "+1" are used as the input terminal of the gate signal generation circuit, and this connection point is further connected to the base of the transistor Q through the resistor aI4. The collector of Q is connected to the positive terminal of a constant voltage diode Z1 through a resistor, and the emitter is grounded through a capacitor C1.

On the other hand, there is a resistance between the terminals of the constant voltage diode ZD.

and R, +7 are connected in series, and the connection point is connected to the gate of PUT Q, which is an ignition element, and the emitter of said transistor Q is connected to the anode of P[JTQ. Ground through the primary side of the The configuration is such that a triac signal (41) is supplied from the secondary side of the transformer TR.

Next, the operation of this light control device will be explained. First, with the pull switch SW as the operation switch open, turn on the power supply E.
When S is turned on, charging current for capacitor C4 flows in the clear pulse generation circuit.

Resistor] A pulse voltage is generated across both ends of the resistor. This voltage is applied as a clear pulse to the clear input terminal (3) of the shift register IC. In this state, the shift register IC
Although the power supply voltage VDD and data input are applied to the clock terminal (4), no shift pulse is applied to the clock terminal (4), so no output signal is generated at the output terminals (5) to (8). Therefore, the voltage applied by the constant voltage diode ZD2 is applied to the base of the transistor Q through the resistor and the voltage divided by -3 and applied through the resistors R and I4, thereby setting a relatively low pace bias voltage. Therefore, the trigger phase of the triac Q is also relatively delayed, and the voltage supplied to the light source is also relatively low.

Next, close the contact of the pull switch SW, and while the contact is closed, resistor 1~a, , PUT Q2. A clock pulse generation circuit constituted by capacitor C5 operates and equally spaced pulse voltages are generated across the resistor.

This voltage is supplied as a clock pulse to the clock input terminal (4) of the shift register IC. As a result, first, time 1. At this point, the shift register ICO')Q, /output is generated, and this output continues to be generated since the data input is continuously applied as a direct current.

In response to this, the base of the transistor Q in the relaxation oscillator circuit has a resistance of the voltage specified by the constant voltage diode ZD, [- and the parallel resistance value of 2 and the resistance island, 1
As a result, a voltage approximately equal to the divided voltage is applied. That is, the above-mentioned time t. The base bias of the transistor q increases compared to the bias between -11, which advances the trigger phase of the triac Q1 and increases the voltage applied to the light source. '□ When the time advances further and reaches 1t, the clock pulse generation circuit consisting of PUT Q7 etc. generates the second pulse at both ends of the resistor island, and this is supplied to the clock input terminal (4) of the resistor IC, so Similarly to the above, the Q2' output terminal (6) of the shift register IC also generates the output' voltage. As a result, the base of the transistor Q3 is connected to a resistor with a voltage specified by the constant voltage diode ZD2,
A value approximately equal to the voltage divided by the parallel resistance value of the cap and R, 12 and the resistive island is applied via the resistor Rqt.

As a result, the base bias of the transistor Q3 increases further than the bias between times t1 and 12, and therefore the trigger phase of the triac Q1 further advances and the voltage applied to the light source further increases.

Thereafter, following the same process, when time t3 is reached, Qs' output of the shift register is generated, and when time t is reached, Q4' output is generated, and the base bias of transistor Q increases accordingly, and the light source The applied voltage for each rises in steps.

In this state, even if the contact of the pull switch SW is kept closed after time t4, a clock pulse will still be generated, but in this case, there will be no output from the shift register IC in response to it, so it will not affect the voltage applied to the load.

Furthermore, no matter when the contact of the pull switch SW is opened, this switch SW is in a separate system from the power supply that supplies the power supply voltage vDD and data input of the shift register IC, so in the case of Fig. 1, the AC power supply IDs is As long as it is connected, the output of the shift register IC that has been generated up to that point will continue to be generated.

Therefore, the voltage applied to the light gLi does not change its value and is maintained at a constant level.

Thus, from one opening/closing operation of the contact of the pull switch SW,
You can get 5 output levels including the first level. The number of output levels can be easily increased by increasing the number of output terminals of the shift register IC.

This lighting equipment operates by opening and closing one contact in the signal circuit.
The level of voltage supplied to the light source can be set arbitrarily. Therefore, even if this unit is installed on a high ceiling, the illuminance can be changed to increase in stages as shown in Figure 2 depending on how long the pull switch SW is pulled, and when the pull switch SW is released. It is possible to maintain the illuminance immediately before the illumination.

Moreover, the time required for the change is constant for each stage, and the width of the change in illuminance for each stage (eight people) is adjusted to the extent that it can be seen by, for example, a setting of one resistor and one resistor. If the width of this change is small, it becomes difficult to distinguish between each stage due to the visual afterglow effect, and if it is too large, the desired brightness cannot be obtained because the number of changes from the dark state to the bright state is small.

Therefore, it is desirable to set the range of change as follows.

In other words, if the illuminance at maximum output is 100, then 5~
If 1.0 CI:L and the illumination intensity at time 1° in FIG. 2 is 40 to 60, about 6 levels can be obtained. Moreover, the time required to move to one stage is 0.3 to 0.8
Make it about seconds. In this way, the illuminance changes by 5 to 10 steps to move one stage, so there is little afterglow effect, the user can clearly feel the illuminance change, and the increments are small enough for practical use. There are times when you can do this.

Therefore, the user can adjust the illuminance easily and accurately by closing the pull switch SW and watching the illuminance change step by step, and when the desired brightness is reached, by opening the switch SW.

This light control device changes the number of clock pulses according to the operation time of the operation switch, counts the clock pulses cyclically using a shift register, selects a resistor according to the count, and Since the light is dimmed by generating a gate signal in response to (1) there is only a single operation switch, and the desired dimming level can be easily set by simply controlling the on/off of the switch.

(2) As long as there is no input pulse, the shift register reliably maintains the output for one lighting period (therefore, the dimming level does not change undesirably).

+3) At the same time as '11 is turned on, the clear pulse generating circuit operates to clear the shift register, so it is possible to always set a constant dimming level when the power is turned on.

It has the following features.

In this dimming device, the shift register operates cyclically as described above, so even if you want to adjust the dimming level once you have set it, you can simply operate a single operation switch in the same way as the first time. It can be set to the dimming level.

In the case of the conventional technology, one switch only increases the load conductivity, and the other switch only decreases it, so it is necessary to use them properly, which makes operation cumbersome, but in the case of the present invention, 1. For example, if the dimming level is configured to change from small to large, if the operation switch is operated continuously, the dimming level will change from small to large to large. When the desired level is reached, stop the operation. good.

Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without changing the gist.

For example, in the above embodiment, the illuminance increases step by step, but the present invention can also be implemented in four stages so that the illuminance gradually decreases over time, as shown in FIG.

Furthermore, as the operation switch, a pull switch as shown in FIG. 4 Cal has been described.

This invention is not necessarily limited to this;
b) and IC) A toggle switch or rotary switch as shown above may be selected as appropriate.

As described above, according to the present invention, the number of clock pulses is changed according to the operation time of the operation switch, the clock pulses are cyclically counted by the shift register, a resistor is selected according to the count, and the resistor is connected to the clock pulse. By generating a gate signal accordingly and controlling the light, it is possible to provide a light control device that allows easy operation of the operation switch and can accurately and stably control the light of the light source.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a circuit configuration diagram of an embodiment of the present invention, Figs. 2 and 83 are stepwise illuminance change characteristic diagrams for detailed explanation of this invention, and Fig. s4. FIG. 2 is an explanatory diagram showing examples of various operation switches used in the present invention. E S...AC 1 source Q,...Triac L...Light source Do...Full wave rectifier 1
(・1～Meitō...Trust C1～C5...
・Capacitor DZI, -DZ2- Constant'i It da-(,t-1'Q,,Q,...PUT Q
s...1-Rangista 〢p! Bachelor (] Figure 2, Figure 3, last time - Figure 4,.) (''

Claims (1)

[Claims] A clock pulse generation circuit connected to a phase control device that controls the phase of the father current, a τ filter light source that dims and turns on according to the output of this phase control device, a rectified constant voltage source, and a 1T4 connected to this power supply. Then, the operation switch 7, which controls the operation of the clock pulse generation circuit, inputs the clock pulse, and depending on the clock pulse output, multiple ends are connected to the clear terminal of the shift register, and when the power is turned on, a clear pulse is generated to shift. A clear pulse is generated to clear the register.
A gate signal whose phase is controlled according to the resistance value of one of the resistors selected by the operation of a shift register, with the other end of these resistors connected to the signal input terminal on a plurality of resistors with different resistance values? and a gate signal generating circuit configured to generate a gate signal and control the phase control device and the conduction phase using the gate signal.