JPH0896971A - Lamp switching lighting device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a lamp switching and lighting device for automatically switching between two lamps for lighting and prolonging the lamp replacement cycle. [Configuration] A negative phase detection circuit 2 that detects a negative phase when the AC power supply 1 is turned on, a positive phase detection circuit 3 that detects a positive phase, a rectifying element 4, and a negative phase detection circuit 2 When the negative phase is detected, the negative holding circuit 5 that sends out a control signal that blocks the operation of the positive phase detection circuit 3 and the operation of the negative phase detection circuit 2 when the positive phase detection circuit 3 detects the positive phase are blocked. A positive holding circuit 6 for sending a control signal to operate, a switch 7 for operating the negative holding circuit 5, a switch 8 for operating the positive holding circuit 6, and a first holding circuit in the state of the positive holding circuit 6.
And a load switching circuit 9 that controls a relay 10 for switching and lighting the second lamps 11 and 12 to form a switching lighting device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp switching lighting device having a function of automatically switching between two lamps for lighting and prolonging a lamp replacement cycle.

[0002]

2. Description of the Related Art Generally, in exterior lighting and the like,
Depending on the installation location of the lighting fixture and the structure of the lighting fixture, replacing the lamp may be very troublesome, and if a light source with a short life is used, the replacement interval of the lamp will be shortened, which makes maintenance very easy. Becomes worse. Therefore, conventionally, a configuration has been used in which a plurality of lamps are arranged in a single lighting fixture, and after one lamp becomes defective, the other lamps are turned on.

[0003]

However, such a configuration in which a plurality of lamps are arranged in a single luminaire and one lamp is lit up and then the other lamp is lit is arranged. However, since it is used after long-term storage, there is a risk that the life of the second lamp will be impaired.

The present invention has been made in order to solve the above-mentioned problems in the conventional switching and lighting device. The two lamps are selectively switched and lit at the same time in a progressive manner at an equal probability, and the apparent lamp life is increased. It is an object of the present invention to provide a lamp switching lighting device capable of doubling the number of lamps and prolonging the lamp replacement cycle.

[0005]

In order to solve the above problems, the invention according to claim 1 is to detect the positive and negative phases of the voltage waveform when the AC power source is turned on, and to detect the phase detecting means. A lamp switching lighting device is configured by providing means for selectively lighting the two lamps based on a signal.

In the lamp switching and lighting device configured as described above, the phase detecting means detects the positive and negative phases of the voltage waveform when the power is turned on, and the two lamps are selectively switched and turned on based on the detection signal. It The probability that positive and negative phases appear when the power is turned on can be considered to be approximately 1/2, so the two lamps are lit with approximately equal probability, and thus the two lamps are used alternately in a progressive manner. The apparent lamp life can be doubled, and the lamp replacement cycle can be extended.

According to a second aspect of the present invention, the means for detecting the positive and negative phases of the voltage waveform when the AC power source is turned on, and the two lamps are selectively switched and turned on based on the detection signal of the phase detecting means. And a means for detecting the lighting state of the lamp, and a means for reversing the switching state of the switching lighting means when an astigmatism state of the lamp is detected.

In the invention described in claim 1, there is a possibility that a lamp defect will occur accidentally, and in that case, the switching lighting means remains switched to the side corresponding to the phase of the voltage waveform on the defect side. Therefore, there is a problem that the lamp does not light until the power is turned on again, and the lamp replacement cycle is not necessarily doubled. According to the second aspect of the invention, since the lamp lighting state detecting means and the switching state reversing means are provided as described above, when a defect occurs in the selected lamp, the defect condition is detected. The lamp can be switched to the other lamp and turned on, and the lamp replacement cycle can be extended more reliably.

[0009]

EXAMPLES Next, examples will be described. FIG. 1 is a block diagram showing an embodiment according to the invention described in claim 1. In the figure, 1 is an AC power supply, 2 is a negative phase detection circuit for detecting the negative phase of the voltage waveform when the AC power supply 1 is turned on,
3 is a positive phase detecting circuit for detecting the positive phase of the voltage waveform, 4 is a rectifying element for supplying DC power to a lamp selecting circuit and a holding circuit, which will be described later, and 5 is a negative phase detecting circuit by the negative phase detecting circuit 2. A negative holding circuit that sends out a control signal for blocking the operation of the positive phase detection circuit 3 at times, and 6 also blocks the operation of the negative phase detection circuit 2 when the positive phase detection circuit 3 detects a positive phase. A positive holding circuit for sending a control signal for controlling the negative holding circuit, 7 is a switch for operating the negative holding circuit 5 when the negative phase detection circuit 2 detects the negative phase, and 8 is also a positive holding circuit when the positive phase is detected. A switch for operating the circuit 6 and a load switching circuit 9 for controlling the relay 10 for switching and lighting the first and second lamps 11 and 12 in the state of the positive holding circuit 6.

Next, the operation of the lamp switching and lighting device thus constructed will be described. First, when the power supply 1 is turned on, one of the phase detection circuits 2 and 3 detects the input phase of the voltage waveform, and the detection signal is sent to either the switch 7 or 8. For example, when the power-on phase is negative, a signal is sent from the negative phase detection circuit 2 to the switch 7, the negative holding circuit 5 operates, and a signal is output from the holding circuit 5 to detect the positive phase. The operation of the circuit 3 is blocked. When the power-on phase is positive, a signal is sent from the positive phase detection circuit 3 to the switch 8, the positive holding circuit 6 operates, and the control signal from the holding circuit 6 causes the negative phase detection circuit 2 to operate. Prevent movement. In this way, the positive or negative holding circuits 5 and 6 are connected to the power source 1 to detect the phase only when the power is turned on.
Holds the phase at the time of turning on.

The load switching circuit 9 is a positive holding circuit 6.
When the positive holding circuit 6 is not operating, that is, when the negative holding circuit 5 is operating, the second lamp 12 is turned on via the relay 10 and vice versa. When the positive holding circuit 6 is operating, the first lamp 11 is turned on.

In this way, one lamp is selected and lit depending on whether the voltage waveform phase is positive or negative when the power is turned on.
By the way, the AC power supply 1 is a high frequency sine wave,
° ~ 180 ° becomes a positive phase, 180 ° ~ 360 ° becomes a negative phase, and this is detected by the phase detection circuits 2 and 3, but when the power is turned on at random, positive and negative phases appear. The probability is approximately 1/2, so the two ramps will be selected with approximately equal probability.

Next, a concrete circuit configuration example of the embodiment shown in FIG. 1 will be described with reference to FIG. In FIG. 2, 101 is an AC power supply, 102 is a voltage dividing resistor, and 103 is a first photocoupler PC1 connected in parallel with one of the voltage dividing resistors.
The light emitting diode 104 is a phototransistor of the fourth photocoupler PC4, which is also connected in parallel to one of the voltage dividing resistors, and constitutes a negative phase detection circuit. 105 is a voltage dividing resistor, 106 is a photodiode of the second photocoupler PC2 which is connected in parallel to one of the voltage dividing resistors, and 107 is a third photodiode which is also connected in parallel to one of the voltage dividing resistors 105. The phototransistor of the photocoupler PC3 constitutes a positive phase detection circuit.

Reference numeral 108 is a rectifying element, 109 is a charging resistor for the state holding electrolytic capacitor described below, which is connected to one end of the output of the rectifying element 108, and 110 is a charging resistor 109.
The photo-switching element of the first photo-coupler PC1 connected in series to the above constitutes a switch for the negative holding circuit. 111 is a negative-state holding electrolytic capacitor connected in series with the photo-switching element 110 and charged via the charging resistor 109 and the photo-switching element 110 to hold the state. 112 is a state-holding electrolytic capacitor. A voltage dividing resistor for dividing the voltage of the capacitor 111, and 113 is a third photocoupler connected to the voltage dividing point of the voltage dividing resistor 112.
The light-emitting diode of PC3 constitutes a negative holding circuit.

Reference numeral 114 is also the charging resistor 109.
The photo-switching element of the second photo-coupler PC2 connected in series to the above constitutes a switch for the positive holding circuit. Reference numeral 115 denotes a positive state holding electrolytic capacitor connected in series with the switching element 114 and charged via a charging resistor 109 and a photoswitching element 114 for holding a state. 116 denotes a state holding electrolytic capacitor.
A voltage dividing resistor for dividing the voltage of 115, 117 is a light emitting diode of the fourth photocoupler PC4 connected to the voltage dividing point of the voltage dividing resistor 116, and these elements constitute a positive holding circuit. .

118 is the electrolytic capacitor for maintaining the positive state
Positive state electrolytic capacitor connected in parallel with 115
When 115 is charged, it is a base resistor for dividing this voltage to drive the transistor described below, and 119 is a switching transistor whose base is connected to the voltage dividing point of the base resistor 118. The load switching circuit is composed of these elements. 120 is a switching relay, a rectifying element
It is connected between the output terminal of 108 and the collector of the switching transistor 119. Reference numeral 121 is a palister for protecting relay contacts connected in parallel with the switching relay 120, 120a is a relay contact of the switching relay 120, and the common terminal is the power source. The switching contacts are the first lamp 11 and the second lamp respectively. It is connected to one of the 12 input terminals.

The operation of this specific configuration example will be briefly described as follows. When the power is turned on, in the case of a negative phase, the light emitting diode 103 of the first photocoupler PC1 of the negative phase detector emits light, whereby the first photocoupler PC1
The photoswitching element 110 of turns on, the negative state holding electrolytic capacitor 111 is charged thereby, the voltage is divided by the voltage dividing resistor 112, and the light emission of the third photocoupler PC3 of the negative holding circuit. The diode 113 emits light. This enables the third photocoupler of the positive phase detection circuit.
The phototransistor 107 of PC3 is turned on, the light emitting diode 106 of the second photocoupler PC2 is short-circuited, and the operation of the positive phase detection circuit is blocked. As a result, the photoswitching element 114 of the second photocoupler PC2 remains off and the positive holding circuit becomes inoperative. Therefore, the switching transistor 119 is off, the relay 120 does not operate, the relay contact 120a is connected to the second switching contact side, and the second lamp 12 is turned on.

On the other hand, when the power is turned on and the phase is positive, the positive phase detection circuit and the positive holding circuit operate in the same manner, the switching transistor 119 is turned on to operate the relay 120, and the relay contact 120a. Is connected to the first switching contact side to light the first lamp 11.

Next, the embodiment of the invention described in claim 2 is shown in FIG.
A description will be given based on the block diagram shown in FIG. 3, the same or corresponding members as those of the embodiment of the invention described in claim 1 shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. The embodiment of the invention according to claim 2 is different from the embodiment of the invention according to claim 1 in that a lighting detection circuit 13 for detecting a lighting state of the first lamp 11 or the second lamp 12 which is further selected. Then, after receiving a detection signal from the lighting detection circuit 13, a state inversion circuit 14 that inverts the operation blocking states of the positive and negative phase detection circuits 2 and 3 and a delay in the state inversion circuit 14 after a lapse of a certain delay time. A delay circuit 15 for giving is provided.

Next, the operation of the embodiment thus constructed will be described. When the power is turned on and the load switching circuit 9 operates according to the phase at the time of turning on, one of the lamps 11 and 12
Up to the operation of selectively lighting, is the same as the embodiment shown in FIG. Next, the state inversion circuit 14 in this embodiment
The operation of will be described. The state inversion circuit 14 is a delay circuit 15
After a lapse of a certain period of time, the positive holding circuit 6 sends the same signal as the signal sent to the negative phase detection circuit 2 to the positive phase detection circuit 3 when the voltage phase is positive when the power is turned on. The operation of the phase detection circuit 3 is canceled. As a result, the operation of the positive holding circuit 6 is stopped, and the negative phase detection circuit 2
Becomes an operating state, and thereafter only negative phase detection is possible. When the voltage phase is negative, the negative holding circuit 5
Sends the same signal to the negative phase detection circuit 2 as the signal sent to the positive phase detection circuit 3, whereby the negative phase detection circuit 2
Is canceled. As a result, the operation of the negative holding circuit 5 is stopped, the positive phase detection circuit 3 is in the operating state, and only the positive phase detection is possible thereafter. Then, the series of operations is repeated by the delay circuit 15 every time a fixed time elapses.

However, with this state inversion circuit 14 alone, the lamp load is switched at regular intervals as described above, so in this embodiment, this state inversion operation is performed by the lamp selected at power-on. The lighting detection circuit 13 is added so that it is performed only when there is no point. This lighting detection circuit 13 detects the lighting state of the selected lamp, although the detection method differs depending on the lamp used, and when the lamp is lighting, sends a switching non-permission signal to the state inversion circuit 14 to perform this state inversion operation. Prevent. Conversely, when the selected lamp is defective, the lighting detection circuit 13 does not send the switching disapproval signal,
Therefore, the state inversion circuit 14 operates to switch to the other lamp and light it.

The delay circuit 15 is provided for the state inverting circuit 14 to wait for the switching non-permission signal sent when the lighting of the lamp 11 or 12 is detected until the output state of the lamp becomes stable. , HID lamps that take a long time to rise are considered.

As described above, when the selected lamp is imperfect, the voltage phase can be detected not only when the power is turned on, but the other lamp is switched on without turning on the power again. Can be made.

Next, a concrete circuit configuration example of the embodiment shown in FIG. 3 will be described with reference to FIG. In FIG. 4, FIG.
The same or corresponding members as those of the circuit configuration example shown in FIG. In FIG. 4, 122 is a backflow blocking diode connected to one end of the output of the rectifying element 8, 123 is a series connection with the backflow blocking diode 122,
A time constant resistor for charging the electrolytic capacitor, which will be described below, 124 is connected between the time constant resistor 123 and the other end of the output of the rectifying element 8, and is charged by the time constant resistor 123. A time constant electrolytic capacitor 125 is a trigger element connected to a connection point between the resistor 123 and the electrolytic capacitor 124, and these members constitute a delay circuit.

Reference numeral 126 is a current reducing resistor connected in series with the trigger element 125, and the relay contact of the relay 120 is provided at the other end.
The common contact of 120a and the collector of the phototransistor 127 of the seventh photocoupler PC7 are connected. Further, the switching contacts of the relay contact 120a are connected to the light emitting diodes 128 and 129 of the fifth and sixth photocouplers PC5 and PC6, respectively. The phototransistor 133 of the fifth photocoupler PC5 is the fourth phase of the negative phase detection circuit.
Is connected in parallel with the phototransistor 104 of the photocoupler PC4, and the phototransistor 134 of the sixth photocoupler PC6 is connected in parallel with the phototransistor 107 of the third photocoupler PC3 forming the positive phase detection circuit. They are connected to each other, and the above-described constituent elements form a state inversion circuit.

Reference numeral 135 denotes an electronic transformer which serves as a power source for a lamp such as a low-pressure halogen lamp. The transformer 135 is configured by using a self-excited half-bridge inverter. When the output stops and the load is connected, the oscillation starts and the output appears. The first lamp 11 and the second lamp 12 are switchably connected to the output end of the transformer 135 via the relay contact 120a of the relay 120. Also, at the output end of the electronic transformer 135, a protective resistor is
A series circuit of 130 and the light emitting diode 131 of the seventh photocoupler PC7 is connected, and a protective diode 132 is connected in parallel to the light emitting diode 131, and these elements constitute a lighting detection circuit.

The operation of this concrete circuit configuration will be briefly described below. First, when the power is turned on, a negative phase is detected, and the second lamp 12 is selected and turned on as shown in the figure. In this case, when the second lamp 12 is in a faulty state, the electronic transformer 135 does not output, and the light emitting diode 131 of the seventh photocoupler PC7 stops emitting light, which causes the phototransistor 127 of the seventh photocoupler PC7. Is turned off, and therefore, after the elapse of the time set by the delay circuit, the phototransistor 133 of the fifth photocoupler PC5.
Turn on to cancel the operation of the negative phase detection circuit. This activates the positive phase detection circuit and the positive holding circuit, switching the relay 120 and switching the relay contact.
120a is switched and the first lamp 11 is turned on.

[0028]

As described above on the basis of the embodiments,
According to the first aspect of the present invention, the phase of the voltage waveform when the power is turned on is detected, and the two lamps are selectively switched and lit based on the detection signal, so that the apparent lamp life is doubled. The lamp replacement cycle can be extended. Further, according to the invention of claim 2, even when a defect occurs in the lamp selected in the invention of claim 1, the defect state is detected, and the other lamp is switched to be lit. As a result, the lamp replacement cycle can be extended more reliably.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the invention described in claim 1.

FIG. 2 is a diagram showing a specific circuit configuration example of the embodiment shown in FIG.

FIG. 3 is a block diagram showing an embodiment of the invention described in claim 2.

FIG. 4 is a diagram showing a specific circuit configuration example of the embodiment shown in FIG.

[Explanation of symbols]

 1 AC power supply 2 Negative phase detection circuit 3 Positive phase detection circuit 4 Rectifier element 5 Negative holding circuit 6 Positive holding circuit 7, 8 switch 9 Load switching circuit 10 Switching relay 11 First lamp 12 Second lamp 13 Lighting detection circuit 14 State inversion circuit 15 Delay circuit

Claims (2)

[Claims] 1. A means for detecting positive and negative phases of a voltage waveform when an AC power source is turned on, and means for selectively switching on and lighting two lamps based on a detection signal of the phase detecting means. Lamp switching lighting device characterized by. 2. A means for detecting positive and negative phases of a voltage waveform when an AC power supply is turned on, a means for selectively switching between two lamps based on a detection signal of the phase detecting means, and a lighting state of the lamps. And a means for inverting the switching state of the switching and lighting means when a faulty state of the lamp is detected.