KR900002169Y1 - Automatic lighting control circuit - Google Patents

Abstract

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Description

Dimming Control Circuit

1 is a block diagram of the present invention.

2 is an embodiment circuit diagram of the present invention.

3 is a waveform diagram of the main part of the present invention.

* Explanation of symbols for main parts of the drawings

1: Zero voltage detector 2: Comparator

3: firing pulse generator 41: first triac

42: second triac 7: rectifier

a: Dimming control circuit

The present invention relates to a dimming control circuit capable of linearly controlling the dimming state from a relatively dimmer to a small load.

Known in this technical field, it was mainly to control the brightness of the light by performing phase control on the input sinusoidal alternating current by a thyme dimmer, but it was 0-30 and 70 It was hard to achieve good control at all down to -100.

In addition, the 30-70 had a lot of problems in varying the dimming characteristics due to the sharply changed by the on / off switch function.

Therefore, to improve their irrationality, another prior art was to use a single fader with reverse characteristics of the type timer, but in these, as shown in (Table 1), the change in dimming characteristics is almost nonlinear. It was difficult to satisfy the conditions as the dimming control circuit having better characteristics.

TABLE 1

An object of the present invention is to solve all the above-mentioned drawbacks in the prior art, which is to efficiently control the dimming in such an article by allowing the dimming output output from the dimmer to be linearly varied. .

Another object of the present invention is to ideally control the power control applied to the dimmer by detecting a zero point in the input phase of the AC power and giving a technical means for generating a firing pulse compared with the DC variable signal source.

If this is described in detail as follows.

That is, FIG. 1 is a circuit diagram of the present invention, which is connected to the rectifier 7 through a power transformer Ts through a commercial power input terminal ACi and a zero voltage detector 1 connected to the output thereof.

On the other hand, a DC signal is applied to the comparator 2 from a DC variable stage DC, which is a phase control variable signal of an actual AC sine wave, and an output terminal of the zero voltage detector 1 and an input terminal of the comparator 2 are connected. .

The output of the zero voltage detector 1 and the output of the comparator 2 are applied to the firing pulse generator 3, respectively, and the firing pulse generator 3 passes through the signal pulse transformer T ₁ . The triac 41 is applied to the gate of the first triac 41, and the triac 41 is connected to the second triac 42 connected in parallel to the load 5 stage, and the cathode of the first triac 41 is The configuration leads to the gate of the second triac 42.

The comparator 2 is composed of the OP amp 21 and the feedback circuit 22. The op amp 21 is supplied with ti power from the second power supply terminal 71 of the rectifier 7.

The circuit including the rectifier 7, the second power supply terminal 71, the zero voltage detector 1, the comparator 2, the firing pulse generator 3, and the first triac 41 is dimmed. It becomes control circuit part a, and is comprised as a single circuit unit.

On the other hand, the block diagram of FIG. 1 is an embodiment similar to that of FIG. 2, and the manufacturing voltage detection unit 1 includes the zener diodes 11 and 12, the capacitor 13, and the resistors 14, 15 and 16 of the common connection with the ground point. The comparator 2 is composed of the OP amp 21 and the feedback circuit, and the firing pulse generator 3 is used to adjust the PUT 31, the capacitor 32, and the gate voltage of the PUT 31. Each consists of a resistor 33.

Reference numeral 51 is a neon lamp, 52 is a fuse, T ₂ is a pulse coil, 61 is a thyristor, 6 is a thyristor portion.

The present invention of such a configuration has the following actions and effects.

That is, a voltage equivalent to 100 V AC (the voltage when the commercial power supply is 200 V) is applied to the bridge rectifier 7 at the secondary side of the power transformer TS of the AC power used, which is the zener diode 11 of the zero voltage detector 1. , 12).

This voltage waveform ((2) in FIG. 3) becomes a waveform whose AC input coincides with the 0V point and is used as a signal for synchronizing in the circuit.

The waveform divided into the resistor 14 and the resistor 15 is applied to the + input of the OP amp 21 of the comparator 2 by adjusting the semi-fixed variable resistor 16.

The dimming variable signal is a DC VV-10V range, and a variable control voltage is supplied from the outside to the DS, which in turn is applied to the + side of the OP amp 21.

[3] (3)

The + side of the amp 21 of the comparator 2 is supplied with + power by a diode and a capacitor.

The output of the OP amp 21 of the comparator 2 is applied to the input of the PUT 31 of the firing pulse generator 3 (Fig. 3 (4)), and its anode is also passed through the zero voltage detector 1. The synchronizing signal is simultaneously applied (FIG. 5 (5)) or the gate of the PUT 31 is set to the resistor 33, and the synchronizing signal captured thereby is applied to the gate voltage.

At this time, the capacitor 32 which is in common with the anode of the PUT 31 is a time constant capacitor, and the voltage charged therein is conducted when the gate voltage of the PUT 31 becomes-with respect to the anode so that the number _{1 of the} pulse transformer T ₁ is increased. Discharged to the windings and at the same time the cathode electrodes of the PUT 31 generate sharp firing pulses (FIG. 3).

The firing pulse is firing the pulse transformer (T ₁₎ and the mutual inductive first triac (T ₁₎ to a T ₂ of the secondary side thyristor unit (6).

When the first triac 41 is turned on, the second triac 42 is torn and the load 5 is supplied with a commercial AC power.

Therefore, when the commercial AC power becomes 60 cycles, this circuit operates 120 times in one second, and the maximum power control is achieved when the DC signal input stage DS is 0V.

Therefore, the phase control capability is achieved by controlling the phase of the AC power input to the outside of the dimmer only by varying the DC signal source, which is a commercial input control means of the dimmer control circuit (a).

In addition, the zero cross detection and the interaction with the comparison unit can ensure the accuracy of the phase control and the linear variable control is possible.

Since the present invention can linearly control the dimming output in the dimming control circuit by the direct current variable, it is possible to ensure the reliability and convenience of the dimmer control according to this, and to provide the correct control performance.

Claims (1)

In the phase control of the commercial AC power supply, the lighting power of the load is variably controlled. In the commercial power transformer TS, the zero voltage detector 1 is connected via the rectifier 7 to the zero voltage detector 1. The output is connected between the direct current variable stage DS and the comparator 2 and to the firing pulse generator 3, respectively, and the output of the comparator 2 is connected to another input terminal of the firing pulse generator 3. And an output thereof connected to the second triac 42 for load stage control and the first triac 41 transmitted through a pulse transformer T ₁ .