JPH04253103A - Illumination device - Google Patents

Abstract

PURPOSE:To save electric power by distinguishing the display content as the display of human body detection by day and as the display of the overdischarge state at night. CONSTITUTION:When the ambient illuminance is a preset value or above, an H-level signal is outputted from a brightness identification section 4. When a human body is detected and an H-level signal is outputted from a human body detection section 5, all inputs to an AND gate G7 are made the H-level. A transistor Tr3 is turned on, and a light emitting diode LED is lighted. When the ambient illuminance is the preset value or below, an L-level signal is outputted from the brightness identification section 4. When the charging voltage of a storage battery 2 becomes a preset value or below and the output of an overdischarge protecting circuit 3 becomes an L-level, all inputs to an OR gate G5 are made the L-level, and its output is made the L-level. The transistor Tr3 is turned on, and the light emitting diode LED is lighted.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell-type lighting device that combines a solar cell and a storage battery and lights up a load depending on the ambient temperature and whether or not a human body is detected.

0002

[Prior Art]■ Over-discharge protection operation status display function Conventionally, devices that supply power stored in a storage battery to a load are equipped with an over-discharge protection circuit to prevent the storage battery from becoming over-discharged and deteriorating. is common. Additionally, some devices have a function of lighting up a light emitting diode or the like to indicate when overdischarge protection is working. As a result, the reason why the load does not light up even though human body detection is performed during the overdischarge protection operation can be easily determined by the lighting of the light emitting diode.

[0003] Human body detection display function When a human body is detected, a device that supplies power to a load has a function to display that a human body is detected by lighting up a light emitting diode or the like when a human body is detected. be. In particular, even during the day when the load is not lit, it is possible to confirm whether or not a human body has been detected by lighting the light emitting diode, which is useful as a function that facilitates setting of the human body detection area.

0004

[Problems to be Solved by the Invention] Since the above functions (1) and (2) exist completely independently and have similar display functions, it is possible to consider whether a single device can serve as both functions. In addition, in ■, even in an overdischarge state,
It is meaningless to display an over-discharge state during the day when the solar cells are charging the battery, and it also leads to power consumption.

[0005]Also in (2), even though the load lights up when a human body is detected at night, there is no point in displaying the human body detection, which only results in wasted power consumption. In particular, since the power source is limited to the amount of electricity charged by solar cells during the day, it is necessary to avoid wasteful consumption as much as possible. The present invention has been provided in view of the above-mentioned points, and has a single notification function that provides notification of over-discharge state and notification of human body detection, and also includes notification of human body detection during daytime, The purpose of the present invention is to provide a lighting device that aims to save power by distinguishing it from notifying over-discharge states at night.

[0006]

[Means for Solving the Problems] The present invention receives signals from an over-discharge protection circuit, a light/dark discrimination section, and a human body detection section, and detects a human body during the day and when the over-discharge protection is activated at night. A control means is provided for selectively notifying the state using the same notifying element.

[0007]

[Operation] The control means receives signals from the over-discharge protection circuit, the light/dark discrimination section, and the human body detection section, and the same effect is obtained when a human body is detected during the day and when the over-discharge protection is activated at night. The notification element selectively reports the status.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a specific circuit diagram, in which a storage battery 2 is charged with electric power obtained from a solar cell 1, and a lamp 8, which is a load, is lit by this amount of electricity.The main components include an overdischarge protection circuit 3, It consists of a brightness discrimination section 4, a human body detection section 5, and a load control circuit 6 that controls on/off of a lamp 8. This lighting device is provided with a lighting display control circuit 9 that controls lighting of a light emitting diode LED for display monitoring.

The overdischarge protection circuit 3 outputs an H level signal when the charging voltage of the storage battery 2 is above a predetermined value, and outputs an L level signal when it becomes below a predetermined value. The bright/dark discriminator 4 selects H when the surrounding illuminance is higher than a predetermined value (when it is bright).
Outputs a level signal, and when it falls below a predetermined value (when it is dark)
Outputs an L level signal. Further, the human body detection section 5 outputs an H level signal when detecting a human body.

The output of the bright/dark discriminator 4 is a NAND gate G1.
is inverted and input to one input terminal of NAND gate G2. The output of the human body detection section 5 is directly input to the other input terminal of the NAND gate G2, and the output of the NAND gate G2 is determined by the outputs of both. The output of the NAND gate G2 is connected to the B terminal of the multivibrator 7 and one input terminal of the NAND gate G4 via a resistor R1. Since the multivibrator 7 has the A terminal connected to L level and the C terminal connected to H level,
In response to the signal input to the B terminal falling from H level to L level, the QB output (inverted output of Q) outputs an L level signal for a predetermined time determined by resistor R6 and capacitor C3. It is something to do.

The QB output terminal of the multivibrator 7 is
It is connected to the other input terminal of NAND gate G4. The output of the NAND gate G4 is connected to the base of the transistor Tr1 via a diode D2 and a resistor R2. The potential at point A changes depending on whether the transistor Tr1 is turned on or off, which causes the transistor Tr1 to change.
2 on/off is determined. When the transistor Tr2 is on, a current flows from its collector and the lamp 8 lights up.

[0012] Now, when the surrounding illuminance is above a predetermined value and the output of the bright/dark discriminator 4 is at H level, the NAND gate G1
Since the output of NAND gate G2 becomes L level, regardless of what kind of signal is output from human body detection section 5, the output of NAND gate G2 becomes H level and is input to multivibrator 7 and NAND gate G4. When the signal at the B terminal of the multivibrator 7 is at H level,
Since the QB terminal outputs an H level signal, all inputs of the NAND gate G4 become H level, and its output becomes L level. Therefore, transistor Tr1 is off, the potential at point A increases, and transistor Tr2
is off. Therefore, the lamp 8 is turned off.

Next, when the surrounding illuminance is below a predetermined value,
The output of the bright/dark discriminator 4 becomes L level, and the NAND gate G
1, and an H level signal is input to one input terminal of the NAND gate G2. At this time, the human body detection unit 5
When the output of the NAND gate G2 is at the L level, the output of the NAND gate G2 is at the H level, and the lamp 8 is turned off in the same way as when the H level is output from the bright/dark discriminator 4 described above.

On the other hand, when the human body detection unit 5 detects a human body and outputs an H level signal, all the inputs of the NAND gate G2 become H level, so its output becomes L level, and the multivibrator 7 and Input to NAND gate G4. In multivibrator 7, B
In response to the terminal input, that is, the output of the NAND gate G2 falling from the H level to the L level, the QB terminal outputs an L level signal for a predetermined period of time.

[0015] Nand Gate G4 is Nand Gate G2
When the output of the multivibrator 7 is at the L level, and when the output of the multivibrator 7 is at the L level, that is, when the human body is detected, and then for a predetermined time determined by the resistor R6 and the capacitor C3, the output is at the H level. Output. Therefore, the transistor Tr1 is turned on and the potential at point A is reduced to a value divided by the resistors R4 and R5, so the transistor Tr2 is turned on and the lamp 8 is lit.

The output of the overdischarge protection circuit 3 is connected to a diode D.
3 to the base of the transistor Tr1. Here, when the charging voltage of the storage battery 2 decreases and an L level signal is output from the overdischarge protection circuit 3, the diode D3 becomes conductive even if an H level signal is output from the NAND gate G4. Current is sucked in, and point B becomes L level.

As a result, the transistor Tr1 is turned off, and the transistor Tr2 is also turned off, so that the lamp 8 is turned off. That is, when the charging voltage of the storage battery 2 decreases to a predetermined value or less, the lamp 8 is forcibly turned off to prevent over-discharge. This commercial device is provided with a lighting display control circuit 9 that lights up a light emitting diode LED for display monitoring when a human body is detected during the day and when overdischarge protection is activated at night.

The output of the overdischarge protection circuit 3 and the output of the bright/dark discriminator 4 are each connected to the input terminal of an OR gate G5, and the output of the OR gate G5 is inverted by a NAND gate G6 and connected to one input terminal of an OR gate G8. has been done. Further, the output of the overdischarge protection circuit 3 and the output of the human body detection section 5 are connected to the input terminals of an AND gate G7, and the output of the AND gate G7 is connected to the other input terminal of the OR gate G8. The output of the OR gate G8 is connected to the base of the transistor Tr3, and the output of the OR gate G8 is connected to the base of the transistor Tr3.
r3 turns on and off. When the transistor Tr3 is on, current flows through its collector and the light emitting diode LED
lights up.

First, when the surrounding illuminance is above a predetermined value (the surrounding is bright), the bright/dark discriminator 4 outputs an H level signal. At this time, regardless of whether the output of the over-discharge protection circuit 3 is H level or L level, the output of OR gate G5 becomes H level, and therefore the output of NAND gate G6 becomes L level. Here, if human body detection is not performed and the output of the human body detection section 5 is at L level, the AND gate G
Since one of the inputs of 7 is at H level and the other is at L level, its output is at L level. Therefore, since all the inputs to OR gate G8 are at L level, its output is at L level, transistor Tr3 is off, and light emitting diode LED does not light up.

Further, when human body detection is performed and an H level signal is output from the human body detection section 5, the AND gate G7
Since all inputs are at H level, OR gate G7
outputs an H level signal, and as a result, OR gate G8
Since one input is at L level and the other is at H level, its output becomes H level, transistor Tr3 is turned on, and the light emitting diode LED lights up.

[0021] In other words, if the ambient illuminance is above a predetermined value, the operation or non-operation of overdischarge protection will not affect the lighting of the light emitting diode LED, and the light emitting diode LED will turn on only when a human body is detected. do. On the other hand, when the surrounding illuminance is less than a predetermined value (the surrounding is dark), the light/dark discriminator 4 outputs an L level signal. At this time, regardless of whether the output of the human body detection section 5 is H level or L level, the AND gate G
The output of 7 is at L level.

Here, when the charging voltage of the storage battery 2 is sufficient and the output of the overdischarge protection circuit 3 is at H level, an H level signal is input to one of the inputs of OR gate G5, so the output is The signal becomes H level, is inverted by NAND gate G6, and an L level signal is input to OR gate G8. Therefore, all inputs of OR gate G8 are L
level, its output becomes L level, and transistor Tr3 turns off, so the light emitting diode LED
does not light up.

Furthermore, when the charging voltage of the storage battery 2 falls below a predetermined value and the output of the overdischarge protection circuit 3 goes to L level, all the inputs of OR gate G5 go to L level, so its output goes to L level, and NAND gate G6 The output becomes H level. Therefore, one of the inputs of OR gate G8 is at L level, but the other is at H level, so its output becomes H level, thereby causing transistor T
r3 is turned on and the light emitting diode LED lights up.

In other words, if the ambient illuminance is below a predetermined value, whether or not a human body is detected does not affect the lighting of the light emitting diode LED, and the light emitting diode LED is turned on only when the overdischarge protection is activated. Incidentally, in the above circuit, an incandescent lamp was used as the load, but it is not limited to this, as long as it emits light,
Any type and lighting method may be used. Similarly, the display element for the display monitor is not limited to a light emitting diode (LED), but may be a device such as a buzzer as long as it has the function of displaying its status. Further, the load control circuit 6 is not limited to this, and there is also a method in which the bright/dark discriminator 4 uses the output of the solar cell 1.

Incidentally, the lighting display control circuit 9 constitutes a control means.

[0026]

[Effects of the Invention] As described above, the present invention receives signals from the over-discharge protection circuit, the light/dark discrimination section, and the human body detection section, and detects a human body during the day and when the over-discharge protection is activated at night. Since the control means is provided to selectively notify the state of the same notification element, the control means receives signals from the overdischarge protection circuit, the light/dark discrimination section, and the human body detection section, and detects the human body during the daytime. When over-discharge protection is detected and when over-discharge protection is activated at night, the same notification element selectively notifies the state. Therefore, the human body detection alarm and over-discharge state alarm functions are It is possible to reduce the number of parts by making it possible to use a single device, and because it only notifies human body detection during the day and only overdischarge state at night, it is possible to reduce the load due to human body detection at night. This can reduce wasteful power consumption, such as notifying a person when a human body is detected even though the is lit, or notifying an over-discharge state even though the storage battery is being charged from the solar battery during the day. In particular, since the load must be turned on with only a limited amount of electricity charged in the storage battery by the solar battery, this is more effective in terms of power saving.

[Brief explanation of the drawing]

FIG. 1 is a specific circuit diagram of an embodiment of the present invention.

[Explanation of symbols]

1. Solar cells 2 Storage battery 3 Overdischarge protection circuit 4 Bright/dark identification section 5 Human body detection section 6 Load control circuit

Claims (1)

[Claims] Claim 1: A lighting device that charges a storage battery using a solar battery and lights up a load using the electric power, the lighting device comprising: a light/dark discrimination section that detects the brightness of the surroundings; a human body detection section that detects the presence or absence of a human body; A load control circuit that lights up the load based on signals from the light/dark discrimination section and human body detection section when a human body is detected at a predetermined level of brightness or below, and a load control circuit that controls the load control circuit when the storage battery's charging voltage falls below a predetermined charging voltage. In a lighting device equipped with an over-discharge protection circuit that turns off the load and prevents over-discharge of the storage battery, a human body is detected during the daytime by receiving signals from the over-discharge protection circuit, the bright/dark discrimination section, and the human body detection section. 1. A lighting device comprising a control means for selectively notifying the state using the same notification element when overdischarge protection is activated at night and at night.