JPS5922717Y2 - Incandescent lamp dimmer - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an incandescent lamp dimmer.

FIG. 1 shows a conventional example.

2' is a random pulse generation circuit that generates random pulses at intervals longer than the period of the commercial power supply.The random pulses output from this random pulse generation circuit 2' are applied to the AC phase control circuit 6', and the random pulses are The pulse modulates the oscillation circuit of the AC phase control circuit 6', giving brightness and darkness to the incandescent lamp that is the load.

However, although the above-mentioned random pulse control allows the incandescent lamp to exhibit brightness and darkness, due to the characteristics of the pulse, the changes are steep, so the incandescent lamp gives the impression of a flickering, fluffy flame like a candle. There was a problem in that it was not possible to do so, and on the contrary, it caused discomfort.

The present invention has been proposed in view of the above-mentioned points, and aims to automatically change brightness and darkness to an incandescent lamp, thereby making the incandescent lamp appear to brighten and darken like a candle flame, and to appear to flutter. The purpose of the present invention is to provide an incandescent lamp dimming device.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 2 shows a block diagram. Reference numeral 4 denotes a control signal generation circuit, which is composed of a random pulse generation circuit 2 and a smoothing circuit 3. In FIG.

As shown in FIG. 3, the random pulse generation circuit 2 includes n oscillation circuits 7□, 7□, . . . each having a different oscillation period.
7n outputs are combined to obtain random pulses.

Further, as another example of the random pulse generation circuit 2, the fourth
As shown in the figure, random data is written in the p-ROM 8 in advance and is read out by the address setting circuit 9 to obtain random pulses.

The pulse interval of the random pulses outputted from these random pulse generation circuits 2 is set to be sufficiently longer than the commercial power supply period, for example, about 100 m5 ec to 2 sec.

The smoothing circuit 3 smoothes the random pulse from the random pulse generating circuit 2 and converts it into a ripple waveform signal, and includes a resistor R1R2, a capacitor C1, and a diode D1.
It is composed of D2.

The AC phase control circuit 6 uses the modulation signal of the control signal generation circuit 4 as a power source for setting the phase of the phase control element.

5 is an incandescent lamp for dimming.

FIG. 5 shows a specific circuit diagram, in which a light emitting diode LED is connected to the output terminal of the control signal generation circuit 2, and the AC phase control circuit 6 includes a Cd510, a resistor R3,
It is composed of a triac 11, which is a semiconductor control element, to dim a capacitor C2, a diac 12, and an incandescent lamp 5 by phase control.

A series circuit of the triac 11 and the incandescent lamp 5 is connected in parallel to the commercial power supply 1, and by controlling the phase of the triac 11, the voltage applied to the incandescent lamp 5 is changed to dim the incandescent lamp 5. It is.

Random pulses as shown in FIG. 6a are outputted from the random pulse generating circuit 2 (point ■ in the figure), and the capacitor C1 is charged by the time constant of the resistor R1 and the capacitor C1.

Further, the discharge is performed using the time constant of the resistor R2 and the capacitor C1, and the voltage across the capacitor C1 (point ■ in the figure) is
The result is a smooth, continuous, undulating waveform as shown in FIG.

When a continuous undulating control signal from the control signal generation circuit 4 is applied to the light emitting diode LED in this way, the brightness of the light emitting diode LED also becomes undulating, and the alternating current phase control circuit changes according to this change in brightness. 6 C
The resistance value of d510 also changes.

This causes Cd510, resistor R3 and capacitor C2 to
The time constant determined by changes with time, and the diac 12
The time required to exceed the breakover voltage also changes, and the conduction phase angle of the triac 11 also changes moment by moment.

In this way, the brightness of the incandescent lamp 5 flickers like a candle flame.

FIG. 7 shows a second embodiment, in which a control signal generation circuit 4 and an AC phase control circuit 6 are connected by a transformer T.

A voltage proportional to the change in the output waveform of the control signal generation circuit 4 is added to both ends of the capacitor C2 through the transformer T and the resistor R4.

As a result, the time constant determined by the resistor R3 and the capacitor C2 also changes with time, and the phase angle of the triac 11 also changes moment by moment.

As described above, the brightness of the incandescent lamp 5 comes to fluctuate like a candle flame.

FIG. 8 shows a third embodiment, in which a control signal generation circuit 4 and an AC phase control circuit 6 are directly connected.

The power supply voltage to the resistor R3 and the capacitor C2 serves as a control signal for the control signal generation circuit 4, and since this power supply voltage changes with time, the time constant also changes moment by moment, and the phase angle of the triac 11 changes.

As described above, the incandescent lamp 5 flickers like a candle flame.

FIG. 9 shows a fourth embodiment, in which the power source is a DC power source 13,
Mayo, instead of the triac 11, a transistor Tr
A series circuit of the transistor Tr and the incandescent lamp 5 is connected to the DC power supply 13, and the transistor Tr is controlled by the control signal from the control signal generation circuit 4 to dim the incandescent lamp 5. This is what I did.

That is, a smoothed continuous output voltage, which is a control signal from the control signal generation circuit 4, is applied to the base of the power control transistor Tr through the resistor R4, and as the base voltage changes, the incandescence increases. The value of the current flowing through the lamp 5 also changes, causing the brightness to fluctuate.

As mentioned above, the present invention consists of a random pulse generation circuit that generates random pulses at intervals longer than the commercial power supply cycle, and a continuous undulating control signal by smoothing the output signal from this random pulse generation circuit. A semiconductor control element which forms a control signal generation circuit with an output smoothing circuit, changes an incandescent lamp, and a voltage applied to the incandescent lamp or a current flowing through the incandescent lamp in accordance with a control signal from the control signal generation circuit. Since the series circuit is connected to the power supply, the control signal output from the control signal generation circuit has a continuous undulating waveform due to smoothing of random pulses by the smoothing circuit. By applying the control signal to the semiconductor control element that controls the incandescent lamp, it has the advantage that the incandescent lamp can be automatically turned on and off, and can also be made to flicker like a candle flame.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional example, Fig. 2 is a basic block diagram of an embodiment of the present invention, Fig. 3 is a block diagram of a random pulse generation circuit same as above, and Fig. 4 is another random pulse generation circuit same as above. 5 is a specific circuit diagram of the same as above, FIG. 6 a, l) is an operating waveform diagram of the same as above, FIG. 7 is a specific circuit diagram of the second embodiment of same as above, and FIG. 8 is a specific circuit diagram of the same as above. A specific circuit diagram of the third embodiment, and FIG. 9 is a specific circuit diagram of the fourth embodiment. 1 is a commercial power supply, 2 is a random pulse generation circuit, 3 is a smoothing circuit, 4 is a control signal generation circuit, 5 is an incandescent lamp, and 13 is a DC power supply.

Claims (1)

[Scope of utility model registration request] A control signal is generated by a random pulse generation circuit that generates random pulses at intervals longer than the commercial power supply cycle, and a smoothing circuit that smoothes the output signal from this random pulse generation circuit and outputs a continuous undulating control signal. A series circuit of an incandescent lamp and a semiconductor control element that forms a generation circuit and changes the voltage applied to the incandescent lamp or the current flowing through the incandescent lamp by a control signal from the control signal generation circuit is connected to a power source. Incandescent lamp dimmer.