JPS58117680A - Controller for illumination - 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 includes brightness, illuminance, brightness, etc. of artificial lighting in lighting facilities that utilize natural light. (hereinafter referred to as illuminance)
The present invention relates to a lighting control device that controls lighting.

When detecting the illuminance due to only natural light or the illuminance due only to artificial illumination separately in a state where natural light and artificial illumination are mixed, the method shown in FIG. 1 is used. In FIG. 1, the light receiver 10 detects illuminance in a state where natural light and artificial lighting are mixed. The output signal of the photoreceiver 1o is applied to a first amplifier 12 through a bypass filter 11 that passes signals with a frequency of 100 hertz or more. The reason why the frequency of the bypass filter 11 is set to 100 hertz or more is because the light output waveform of the artificial lighting has a frequency twice that of the power supply that turns on the light. The gain of the first amplifier 12 is determined by the type of light source used for artificial lighting, and is set to average value/(flat value - minimum value) from the average value and minimum value of the light output waveform of the light source. The illumination intensity due to artificial lighting is obtained as the output of the amplifier 12. On the other hand, in the second amplifier 13, by determining the difference between the output of the light receiver 10 and the output of the first amplifier 12,
Illuminance from natural light is obtained at the output of the amplifier 13.

The reference signal generator 14 generates m1 corresponding to the design illuminance, and the third amplifier 16 calculates the difference from the output of the second amplifier 13, that is, the difference between the design illuminance and the illuminance due to natural light. The illuminance to be achieved by artificial illumination is obtained as the output of the amplifier 16 of 3. Next, the comparator 16 compares the output of the third amplifier 15 and the output of the first amplifier 12, that is, the illuminance to be achieved by artificial lighting and the illuminance obtained by measurement, so that the two match. The light source 19 which controls the lighting circuit 18 through the control circuit 17 is turned on by the lighting circuit 18 .

Such a method is effective when the light source 19 is controlled by changing the applied voltage or the number of lit light sources, as long as the optical output waveform does not change as shown in FIG. 2d, but in the case of phase control. cannot be applied to This is because, as shown in FIG. 2, a zero section occurs in the optical output waveform of the light source 18, and the average value/(average value - minimum value) of the optical output waveform fluctuates. Incidentally, the phase control value (minimum value) is 1 regardless of the firing phase.

The present invention provides a device that separately detects natural light and artificial illumination and controls artificial illumination even when a light source is phase-controlled. explain.

FIG. 3 shows that depending on the ignition phase angle of the lighting circuit 18 of FIG.
It controls the gain of the first amplifier 12. The AC power supply 20 is full-wave rectified by diodes 21, 22, 23, and 24, and clipped into a trapezoidal wave by a Zener diode 26. A trigger element 31, such as a PUT, generates a pulse with a bias voltage determined by resistor 29, 30, a time constant determined by transistor 27, and capacitor 28. The pulse generated by the trigger element 31 is
Triac 3 via pulse transformer 32 and resistor 33
4 and the triac 34 is activated.

After the triac 34 is ignited, a current flows through the load (lamp) 36. A transformer 36 is connected to the triac 34 to detect the voltage across the triac 34, and a single voltage is connected to the secondary side of the transformer 36. A stable multivibrator 37 is connected. Monostable multi-bi break 37
operates at the falling edge of the voltage waveform across the triac 340, and its pulse width T is expressed by the following equation.

T = 1/2f (sea) where f is the frequency of the power supply. The output current of the monostable multivibrator 37 is applied to the analog switch 41. The analog switch 41 is conductive while a pulse is applied from the monostable multivibrator 37, and functions to set the gain of the analog amplifier 38 to 1. The gain of analog amplifier 38 when analog switch 41 is off is determined by resistor 39.40. As previously mentioned, an analog amplifier is used as the first amplifier 12 in FIG. By adding the circuit of FIG. 3 to the circuit of FIG. 1, when the load (lamp) 36 is phase controlled, the gain of the analog amplifier 38 is set to 1,
The gain of the analog amplifier 38 can be set to a preset value only when the firing angle is approximately O degrees.As explained above, according to the present invention, even when the light source is phase-controlled, the gain of the analog amplifier 38 can be set to a preset value. It is possible to control artificial lighting by detecting it separately from artificial lighting, which is of great value.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional example, FIG. 2 a shows an optical output waveform when the phase is not controlled, and FIG. 2 b shows an optical output waveform when the phase is controlled. FIG. 3 is a circuit diagram of one embodiment of the present invention. 36... Load (lamp), 37... Monostable multi-bi break 3911@II@II6 analog amplifier, 41...0, analog switch 0

Claims (1)

[Claims] a light receiver, a bypass filter that passes a signal component having a frequency of 100 hertz or more in the output signal of the light receiver, and a first amplifier that is connected to the bypass filter and has a gain of 1 when the light source is dimmed; a second amplifier for determining the difference between the output of the optical receiver and the output of the first amplifier; a reference signal generator; and a third amplifier for determining the difference between the output of the second amplifier and the output of the reference signal generator. a comparison circuit that compares the output of the first amplifier and the output of the third amplifier; a control circuit that is controlled by the output of the comparison circuit; and a lighting device whose ignition phase is determined in accordance with the output of the control circuit. A lighting control device consisting of a circuit and a light source lit by a lighting circuit.