JPS62264599A - Dimming type lighting apparatus - 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 [Object of the Invention] (Industrial Application Field) The present invention relates to a dimmable lighting device that can be dimmed by human body contact.

(Prior art) Conventionally, as this type of lighting device, the
There is a light control device disclosed in No. 0. This is a dimming system in which a lamp that is dimmed by an AC power supply and a triac are connected in series, and the phase of the output signal is changed according to time by applying a potential difference to the control signal terminal.
111 section is connected in parallel to the above-mentioned try hook to have a power supply means for υIWJ in the dimming control section, and the output of this dimming control section 1 is connected to the load circuit via the trigger circuit.
A sensor circuit which is supplied with power from the i, Ill power supply means and has an oscillation circuit therein is connected in parallel to the dimming control section, and the oscillation circuit of the Gonley circuit is controlled. The dimming control 11 is actuated by the output.
The oscillation circuit includes a switch circuit that gives a potential difference to the υ control signal terminal of the oscillation circuit, and a capacitor that makes both ends of the AC power supply the same potential with respect to the high frequency output of the oscillation circuit is connected in parallel to the AC power supply. When a human body touches the touch plate connected to the output end of the oscillation circuit, touch play 1...
An oscillating current is passed through the closed circuit of the oscillating circuit at one end of the alternating current M'fl on the operating human body, earth, and the earth side to stop the oscillation, and at the same time, dimming the lamp by applying a potential difference to the υj double signal terminal. It is.

(Problem to be solved by the invention) However, this conventional example uses a Colpitts oscillation circuit as an oscillation circuit, and its normal oscillation frequency is 250 Kl-12.
In addition to the low level, there is also the problem of low oscillation output.

Therefore, a capacitor that makes both ends of the AC power source have the same potential with respect to the high-frequency output of the oscillation circuit must be connected in parallel to the AC power source, which increases the number of parts and increases the cost. In addition, when the oscillation frequency is low, the touch plate must be made small to minimize noise, and in order to improve dimming operability, it is necessary to reduce the touch area by, for example, using a touch sensor on the entire surface of the light base. There was also the problem that it could not be made wider.

The present invention has been made based on the above problems, and aims to provide a dimmable lighting device that can increase the oscillation frequency, eliminate unnecessary capacitors, and widen the touch area to improve operability. This is the purpose.

[Structure of the Invention] (Means for Solving the Problems) The present invention includes a lamp and a triac that are connected in series to an AC power source, and a triac that is connected in parallel to the triac via a trigger circuit to give a potential difference. a dimming control section 11 that outputs an output signal whose phase changes according to time to the triac; and a sensor circuit that has a touch plate and an excavation circuit and applies a potential difference to the dimming control section via a switch circuit. In the dimming type lighting device described above, the oscillation circuit is caused to oscillate at a high frequency, and when a human body comes into contact with the touch plate, a potential difference is applied to the dimming II 111 section due to a change in the sharpness of the oscillation of the oscillation circuit. It is something.

(Function) By oscillating the oscillation circuit at a high frequency, the oscillation output can be increased and the influence of noise can be reduced, the touch area of the touch plate can be expanded, and the operability can be improved.

(Example) Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

In FIG. 1, 1 is a load circuit, which is made up of an AC power supply 2, a lamp 3 which is a light source, 4 noristors 1 to 4 for phase control, and a choke coil L1 connected in series. .

3A is a fuse.

5 is an i-RIGA circuit, and the triac 4C first terminal T
A series circuit of a capacitor C+, a diode D++, a capacitor C2, and a resistor R1 is connected between + and the choke coil L1, and a series circuit of a capacitor C3, a diode D2, and a resistor R2 is connected between the first terminal T1 and the terminal of the AC power supply. is connected, and a capacitor C is connected between the first terminal T1 and the second terminal 2.
4 and a resistor R3 are connected in series.

6 is a dimming control unit connected in parallel to the triac 4, terminals a and C are power supply terminals, terminals a and b are control signal terminals, terminals c and d are $ control signal output terminals, and terminal e is connected to the intersection of resistor R3 and capacitor C4, and by applying a potential difference V between terminals a and b, the generation phase of the phase output signal is advanced according to time between terminals c and d. Or it has a characteristic of changing steplessly with a period of about 4 seconds, for example. The triac 4 is controlled by the dimming control unit 6 via the trigger circuit 1 to the trigger circuit 5.

A sensor circuit 7 includes an oscillation circuit 8 and a conductive touch plate 9. The oscillation circuit 8 is connected to the 1-transistor T'2
．． Coiled 2.13゜Capacitor Cs + Resistor R4, R5
, R6 and a capacitor C6, and normally oscillates at a frequency of about 2 MHI when the touch plate 9 is not touched by a human body. The touch plate 9 is connected to the surface coil L3. and,
As shown in FIG. 2, this touch plate 9 is made of a conductive plate disposed on the upper surface of an insulating base 11 of a lighting device 1i10 having a built-in lamp 2.

Note that 12 is pseudo.

13 is connected between the dimming control section 6 and the sensor circuit 7, and when the oscillation of the sensor circuit 7 weakens, the dimming control section 6
It generates a potential difference V between terminals a and b of the oscillation circuit 8, and has switching 1 to transistor Tr3 that are turned on and off according to the sharpness Q of oscillation of the oscillation circuit 8.

In the device of the present invention configured as described above, first, when the N source is turned on, the capacitor C5 is charged through the resistor R4.
Along with this, the base voltage of the transistor Tr2 increases, so the transistor Tr2 is turned on.

By turning on this 1-transistor Tr2, a power supply voltage is applied to both ends of the coil L2, and the voltage is applied to the coil L2.
2+E) A current flows which increases proportionally to the time. When current flows through this coil L2, a voltage is induced in the coil L3, which charges the capacitor C5 in a direction that turns off the transistor Tr2. And the transistor Tr
When the base current of transistor Tr2 decreases, the base current of transistor Tr2 decreases.
transitions from the saturated state to the active state, the collector current begins to decrease, and the transistor Tr2 instantly turns off due to the positive feedback of the coils L2 and L3. Capacitor C5 charged to negative voltage by voltage induced in coil L3
is again charged to a positive voltage through the resistor R4, increasing the base voltage of the transistor R2. By repeating the above, the 1-transistor Tr2 is repeatedly turned on and off to perform blocking oscillation.

Next, when the human body touches the touch plate 9 while the oscillation circuit 8 is oscillating in this way, the resistance valve RA and the capacitance C^ that the human body has are applied in series to the oscillation circuit 8, causing the oscillation to occur. The sharpness of ゛ changes. Then, the OF until then
The transistor Tr3, which was in the F state, is turned on, and a potential difference V is generated between the terminals a and b of the dimming control section 6. Due to this potential difference V, the generation phase of the output signal from terminals c and d of the dimming control section 6 changes, the conduction phase of the triac 4 changes, and the lamp 3 becomes steplessly brighter with a fixed period. It gets dark.

Then, when the human body leaves the touch plate 9, the change in the generation phase of the output signal of the dimming control unit 6 stops, and the phase C of the trigger current becomes constant, the conduction phase of the triac 4 is also fixed, and the lamp 3 It becomes the brightness when you leave.

In this way, the oscillation frequency of the oscillation circuit 8 is set to approximately 2MHz.
By doing so, the oscillation output can be made high, so there is no need for a capacitor to make both ends of the AC power supply the same potential for the high frequency output of the oscillation circuit as in the conventional example,
The circuit can be made smaller and cheaper. In addition, by increasing the oscillation output, the influence of noise is reduced, and even if the area of the touch plate 9 is widened as shown in FIG.
Malfunctions are eliminated and operability is improved.

Although one embodiment of the present invention has been described above in detail, it can be modified as appropriate within the scope of the gist of the present invention.

For example, the oscillation circuit 8 can be used other than a blocking oscillation circuit as long as it generates high-frequency oscillation.

[Effects of the Invention] As detailed above, according to the present invention, the oscillation circuit is caused to oscillate at a high frequency, and when a human body comes into contact with the touch play 1, the dimming is performed by changing the sharpness of the oscillation of the oscillation circuit. A potential difference is applied to the 12110 parts, causing the triac to i
By dimming the lamp using I+111II, it is possible to eliminate the need for a capacitor that makes both ends of the AC power supply the same potential for the high frequency output of the oscillation circuit, reducing the number of parts and reducing costs, as well as reducing the influence of noise. By increasing the area of the touch part, it is possible to provide a dimmable lighting device with high operability.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a perspective view of a lighting device.

Claims (1)

[Claims] A lamp and a triac connected in series to an AC power source, and an output signal that is connected in parallel to the triac via a trigger circuit and whose phase changes depending on time by applying a potential difference. A dimming type lighting device comprising a dimming control unit outputting to the triac, and a sensor circuit having a touch plate and an oscillation circuit and applying a potential difference to the dimming control unit via a switch circuit, wherein the oscillation circuit is A dimmable lighting device that oscillates at a high frequency and that when a human body contacts the touch plate, a potential difference is applied to the dimming control unit due to a change in the sharpness of oscillation of the oscillation circuit.