JP7045913B2 - Motion sensor and lighting system - Google Patents

Description

The present invention relates to a motion sensor and a lighting system.

A load control system including a human body detection sensor that outputs a detection signal when the presence of a person is detected and a controller that is connected to the human body detection sensor via a two-wire signal line and controls the load according to the detection signal has been proposed. (See, for example, Patent Document 1). In this load control system, when the human body detection sensor detects the presence of a person, a detection signal is sent to the controller by changing the line voltage of the two-wire signal line, and the controller controls the load according to the detection signal. .. Thereby, for example, the controller can control the power supply to the lighting device, which is a load, so as to cut off the power supply to the lighting device when no person is present, so that the power consumption can be reduced even in the lighting device.

Japanese Unexamined Patent Publication No. 2-291795

By the way, as a human body detection sensor, a sensor provided with a light source for an indicator is provided in order to notify people around the human body detection sensor that the human body detection sensor is in operation. Since the human body detection sensor is provided with a light source for an indicator, people around it can check the operating status of the human body detection sensor, so that it is easy to check the operating status when performing maintenance work on the human body detection sensor, for example. The work efficiency is improved.

A human body detection sensor equipped with this type of light source keeps the light source on continuously during general operation. The human body detection sensor provided with this type of light source consumes more power because it needs to supply power to the light source. In particular, as the number of human body detection sensors installed increases, the power consumption of the light source of each human body detection sensor also increases.

The present invention has been made in view of the above reasons, and an object of the present invention is to provide a motion sensor and a lighting system having a light source and reduced power consumption.

In order to achieve the above object, the motion sensor according to the present invention is
A detection element that detects people and
A constant voltage circuit that receives power from an external power supply via a signal line and outputs a constant drive voltage.
A detection processing unit that receives the drive voltage from the constant voltage circuit and outputs a detection notification signal when a person is detected by the detection element.
A voltage drop circuit that is connected to the detection processing unit and drops the voltage of the signal line from the first voltage to a second voltage lower than the first voltage when the detection notification signal is input from the detection processing unit.
Light source and
Upon receiving the drive voltage from the constant voltage circuit, the light source is intermittently turned on while the voltage of the signal line is dropped to the second voltage by the voltage drop circuit, and the voltage of the signal line is the voltage of the signal line. A lighting control circuit that turns off the light source while being maintained at the first voltage is provided.
The voltage drop circuit is
A Zener diode whose cathode is connected to the high potential side of the signal line,
It has a first switching element, one end connected to the anode of the Zener diode, the other end grounded, and turned on and off in response to the detection notification signal input from the detection processing unit.
The light source is a light emitting diode whose cathode is connected between the anode of the Zener diode and the first switching element.
The lighting control circuit is
A capacitor whose one end is connected to the output end on the high potential side of the constant voltage circuit via the first resistance and whose other end is grounded.
A second switching element having one end connected to the one end of the capacitor and the other end connected to the anode of the light emitting diode via a second resistor.
It has a switch drive unit that turns the second switching element on and off according to the charging voltage of the capacitor.
The period of intermittent lighting of the light source is determined based on the period corresponding to the sum of the discharge period and the charge period of the capacitor .

According to the present invention, the lighting control circuit receives a drive voltage from the constant voltage circuit, and while the voltage of the signal line drops to the second voltage by the voltage drop circuit, the light source is turned on and the voltage of the signal line is changed. The light source is turned off while being maintained at the first voltage. As a result, the ratio of the time during which the light source is lit while the motion sensor is operating can be reduced, so that the power consumption of the motion sensor is reduced.

Schematic diagram showing an example of a lighting system according to an embodiment of the present invention. A block diagram showing a hardware configuration of a part of the lighting system according to the embodiment. Partial circuit diagram of the lighting system according to the embodiment Time chart for explaining the operation of the motion sensor according to the embodiment

Hereinafter, the lighting system according to the embodiment of the present invention will be described with reference to the accompanying drawings. The lighting system according to the present embodiment is connected to the lighting device, a controller for controlling the power supply to the lighting device, and the controller via a two-wire signal line, and the line voltage of the signal line is set to the first voltage. It is provided with a motion sensor that transmits a detection signal to the controller via a signal line by changing the voltage from the first voltage to the second voltage lower than the first voltage. Here, the motion sensor includes a detection element that detects a person, a detection processing unit that outputs a detection notification signal when a person is detected by the detection element, a constant voltage circuit, a voltage drop circuit, and a light source for an indicator. And a lighting control circuit that controls the lighting state of the light source. The constant voltage circuit receives power from the controller via the signal line and outputs a constant drive voltage lower than the second voltage to the detection processing unit. The voltage drop circuit is connected to the detection processing unit, and when the detection notification signal is input from the detection processing unit, the line voltage of the signal line is lowered to the second voltage. The lighting control circuit receives the drive voltage from the constant voltage circuit and intermittently lights the light source while the line voltage of the signal line drops to the second voltage by the voltage drop circuit, and the line voltage of the signal line. Turns off the light source while it is maintained at the first voltage.

As shown in FIG. 1, for example, the lighting system according to the present embodiment includes a plurality of motion sensors 1 installed on the ceiling of the living room RM, a lighting device 3, and a controller 2 installed on the wall of the living room RM. , Equipped with. The controller 2 is connected to the lighting device 3 via a two-wire control line Lc, and controls the power supply to the lighting device 3. The motion sensor 1 is arranged according to the size of the living room RM and the detection range of each motion sensor 1. The plurality of motion sensors 1 are multi-drop connected to the controller 2 via the two-wire signal line Ls. When each motion sensor 1 detects a person in the detection range, it outputs a detection signal to the controller 2 by changing the line voltage of the signal line Ls from the first voltage to the second voltage lower than the first voltage. Further, the controller 2 is connected to the commercial power supply AC via the power supply line Lp.

The controller 2 operates in three types of operation modes: automatic mode, on mode, and off mode. When operating in the automatic mode, the controller 2 controls the on / off state of the lighting device 3 according to the presence / absence of the detection signal transmitted from the motion sensor 1. Further, when the controller 2 is operating in the on mode, the lighting device 3 is maintained in the on state regardless of whether or not the detection signal from the motion sensor 1 is received. This on mode is selected when it is desired to turn on the lighting device 3 regardless of whether or not the detection signal from the motion sensor 1 is received, such as when cleaning the inside of the living room RM. Further, when the controller 2 is operating in the off mode, the lighting device 3 is maintained in the off state regardless of whether or not the detection signal from the motion sensor 1 is received. This off mode is selected when it is desired to turn off the lighting device 3 regardless of the presence or absence of a person in the living room RM, for example, when using an overhead projector. As shown in FIG. 2, the controller 2 includes a power supply circuit 21, a constant voltage circuit 22, a signal detection circuit 24, an operation mode switching circuit 25, an operation mode notification circuit 28, a timer circuit 27, a load control circuit 26, and a load control state. A notification circuit 29 is provided.

The power supply circuit 21 steps down the commercial power supply AC and then rectifies and smoothes it. The constant voltage circuit 22 receives a DC voltage from the power supply circuit 21 and outputs a constant drive voltage. The constant voltage circuit 22 outputs the drive voltage to each of the signal detection circuit 24, the operation mode switching circuit 25, the operation mode notification circuit 28, the timer circuit 27, and the load control status notification circuit 29. The constant voltage circuit 22 maintains the line voltage of the signal line Ls at a constant first voltage V1 in a state where a person is not detected by the motion sensor 1.

The signal detection circuit 24 receives power from the constant voltage circuit 22 and supplies power to the motion sensor 1 via the signal line Ls, and detects the detection signal transmitted from the motion sensor 1. The signal detection circuit 24 is connected to the constant voltage circuit 22 via the current limiting circuit 210. As a result, the current flowing from the constant voltage circuit 22 into the signal line Ls is limited, and even if the line voltage of the signal line Ls changes, the fluctuation of the drive voltage output from the constant voltage circuit 22 is suppressed. When the signal detection circuit 24 detects the detection signal transmitted from the motion sensor 1, it outputs an on signal to the operation mode switching circuit 25.

The operation mode switching circuit 25 has a switch (not shown) for setting the operation mode of the controller 2 to either an automatic mode, an on mode, or an off mode. The user can change the operation mode of the controller 2 by operating this switch. When the operation mode is the automatic mode, the operation mode switching circuit 25 outputs an on signal to the load control circuit 26 and the timer circuit 27 when the signal detection circuit 24 receives the detection signal. Further, the operation mode switching circuit 25 always outputs an on signal to the load control circuit 26 and the timer circuit 27 when the operation mode is the on mode. Further, the operation mode switching circuit 25 always outputs an off signal to the load control circuit 26 and the timer circuit 27 when the operation mode is the off mode.

The timer circuit 27 starts timing when an off signal is input while an on signal is input from the operation mode switching circuit 25. Then, the timer circuit 27 outputs the off signal to the load control circuit 26 when a preset reference time elapses after the off signal is input. Here, the reference time is set to, for example, about 5 minutes.

When the on signal is input from the operation mode switching circuit 25, the load control circuit 26 starts supplying AC power from the commercial power supply AC to the lighting device 3. The load control circuit 26 continues to supply AC power from the commercial power supply AC to the lighting device 3 even if the on signal is stopped after the on signal is input from the operation mode switching circuit 25. Then, when the off signal is input from the timer circuit 27 or the operation mode switching circuit 25, the load control circuit 26 cuts off the supply of AC power from the commercial power supply AC to the lighting device 3.

The operation mode notification circuit 28 has, for example, LEDs (not shown) corresponding to each of the three operation modes, and lights each LED according to the operation mode notification signal input from the operation mode switching circuit 25.

When the on signal is input from the operation mode switching circuit 25, the load control status notification circuit 29 outputs the on signal to the monitoring device 4. Further, the load control status notification circuit 29 outputs an off signal to the monitoring device 4 when an on signal is input from the operation mode switching circuit 25 and then an off signal is input from the operation mode switching circuit 25 or the timer circuit 27. do. In this way, the load control status notification circuit 29 outputs an on signal or an off signal depending on the supply status of the AC power from the commercial power supply AC controlled by the load control circuit 26 to the lighting device 3. Then, the load control state notification circuit 29 outputs an on signal or an off signal depending on the presence or absence of the detection signal received from the motion sensor 1 even when the controller 2 is in the on mode or the off mode. As a result, the monitoring device 4 can recognize the presence / absence of the detection signal transmitted from the motion sensor 1 to the controller 2 regardless of the operation mode of the controller 2.

The controller 2 has, for example, a circuit configuration as shown in FIG. In FIG. 3, the operation mode notification circuit 28 and the load control status notification circuit 29 are not shown. The terminals Te1 and Te2 are connected to the lighting device 3 via a two-wire control line Lc. A relay switch SW11 is inserted in the control line Lc. The power supply circuit 21 includes a transformer T and a rectifying smoothing circuit 211. The transformer T steps down the alternating current input from the terminals Te1 and Te2 connected to the primary side and outputs the AC to the rectifying smoothing circuit 211 connected to the secondary side. A commercial power supply AC is connected to the terminals Te1 and Te2. The rectifying smoothing circuit 211 includes a rectifying circuit (not shown) such as a diode bridge, and a capacitor (not shown) for smoothing the pulsating current output from the rectifying circuit. The constant voltage circuit 22 includes, for example, a Zener diode (not shown), and its high potential side output end VH1 is connected to the terminal Te3 via a current limiting circuit 210. The output end VL1 on the low potential side of the constant voltage circuit 22 is grounded. The current limiting circuit 210 has two transistors Q11 and Q12 and two resistors R11 and R12. The transistor Q11 is, for example, an NPN type transistor, and a collector is connected to the output end VH1 of the constant voltage circuit 22. The resistance R11 is connected between the collector and the base of the transistor Q11. The transistor Q12 is, for example, an NPN type transistor, and the collector is connected to the base of the transistor Q12, the base is connected to the emitter of the transistor Q11, and the emitter is connected to the terminal Te3. The resistor R12 is connected between the emitter and the base of the transistor Q12. The terminal Te3 is connected to the high potential side of the two-wire signal line Ls, and the terminal Te4 is connected to the constant potential side of the signal line Ls. As a result, the constant voltage circuit 22 supplies DC power to the motion sensor 1 via the terminals Te3, Te4 and the signal line Ls.

The signal detection circuit 24 has a comparator CMP and a reference voltage source 241. The positive input end of the comparator CMP is connected to the reference voltage source 241 and the negative input end of the comparator CMP is connected to the terminal Te3. A noise absorbing capacitor (not shown) is connected between the negative input end of the comparator CMP and the terminal Te3. The reference voltage source 241 has, for example, a Zener diode (not shown) and a resistor (not shown) connected between the output ends of the constant voltage circuit 22, and outputs the cathode voltage of the Zener diode. The comparator CMP outputs an H level voltage when the voltage between the terminals Te3 and Te4 becomes lower than the reference voltage output from the reference voltage source 241.

The operation mode switching circuit 25 includes an operation mode setting circuit 251 and a NOR circuit NOR1. The operation mode setting circuit 251 has a flip-flop circuit (not shown) and a switch (not shown) for setting the operation mode of the controller 2 described above, and has an output terminal according to the state of the switch. H level or L level voltage is output from To1 and To2. One input end of the NOR circuit NOR1 is connected to the output end of the comparator CMP of the signal detection circuit 24, and the other input end is connected to the output terminal To2 of the operation mode setting circuit 251.

The operation mode setting circuit 251 outputs an L level voltage from both the output terminals To1 and To2 when the operation mode of the controller 2 is set to the automatic mode. On the other hand, when the operation mode of the controller 2 is set to the on mode, the operation mode setting circuit 251 outputs an L level voltage from the output terminal To1 and outputs an H level voltage from the output terminal To2. Further, when the operation mode of the controller 2 is set to the off mode, the operation mode setting circuit 251 outputs an H level voltage from the output terminal To1 and outputs an L level voltage from the output terminal To2. In the NOR circuit NOR1, when the operation mode of the controller 2 is the automatic mode or the off mode, an L level voltage is input from the output terminal To2, and when the signal detection circuit 24 detects a detection signal, the signal detection circuit 24 to the H level. The voltage of is input. Then, the NOR circuit NOR1 outputs an L-level voltage. Further, in the NOR circuit NOR1, when the operation mode of the controller 2 is the on mode, the H level voltage is input from the output terminal To2, so that the NOR circuit NOR1 is always at the L level regardless of the voltage level input from the signal detection circuit 24. Output voltage.

The timer circuit 27 has a timer integrated circuit 271 and a NOR circuit NOR4 connected to the output terminal of the NOR circuit NOR1 of the operation mode switching circuit 25. The integrated circuit 271 for a timer is connected to the output end of the NOR circuit NOR1 of the operation mode switching circuit 25, starts counting when the voltage input from the output end of the NOR circuit NOR1 reaches the H level, and starts timing, and sets a preset reference time. After that, the H level voltage is output. One input end of the NOR circuit NOR4 is connected to the output terminal To1 of the operation mode setting circuit 251 and the other input end is connected to the output end of the timer integrated circuit 271. The NOR circuit NOR4 outputs an L-level voltage when either the input voltage from the output terminal To1 or the input voltage from the timer integrated circuit 271 reaches the H level. That is, in the NOR circuit NOR4, when the operation mode of the controller 2 is the automatic mode, the voltage input from the output terminal To1 is L level, so that it is H level or L level depending on the voltage level output from the timer integrated circuit 271. Outputs the voltage of. On the other hand, when the operation mode of the controller 2 is the off mode, the NOR circuit NOR4 always outputs the L level voltage regardless of the voltage level of the timer integrated circuit 271 because the voltage input from the output terminal To1 is H level. ..

The load control circuit 26 includes a set relay coil SC, a reset relay coil RC, switching elements Q2 and Q3, NOR circuits NOR3 and NOR5, an inverter IN9, resistors R29 and R210, and a relay switch SW12. The switching element Q2 is, for example, a PNP type transistor, and the switching element Q3 is, for example, an NPN type transistor. The set relay coil SC opens and closes the relay switch SW11 inserted in the control line Lc described above, and the reset relay coil RC opens and closes the relay switch SW12. The relay switches SW11 and SW12 are latching relays and operate so that the open / closed state is always reversed. That is, when the relay switch SW11 is in the open state, the relay switch SW12 is in the closed state, and when the relay switch SW11 is in the closed state, the relay switch SW12 is in the open state.

One end of the series circuit of the resistors R29 and R210 is connected to the output end of the comparator CMP of the signal detection circuit 24, and the other end is grounded. The relay switch SW12 is connected in parallel with the low potential side resistance R210 among the resistances R29 and R210. The NOR circuit NOR3 is a three-input NOR circuit, one input end is connected to the output terminal To1 of the operation mode setting circuit 251 and the other one input end is connected to the output end of the comparator CMP of the signal detection circuit 24. The remaining input end is connected between the resistors R29 and R210. As a result, the NOR circuit NOR3 has an output end due to the level of the output voltage of the comparator CMP, the level of the output voltage of the output terminal To1 of the operation mode setting circuit 251 and the level of the voltage generated between the resistors R29 and R210. Voltage level changes. The voltage level generated between the resistors R29 and R210 is L level when the relay switch SW12 is closed, and H level when the relay switch SW12 is open. A capacitor (not shown) connected in parallel between the resistors R29 and R210 and the relay switch SW12, and between the resistors R29 and R210 and the relay switch SW12 are connected in series. An integrating circuit for chattering prevention having a connected resistor (not shown) may be provided.

The voltage level output from the output terminals To1 and To2 of the operation mode setting circuit 251 is L level when the operation mode of the controller 2 is the automatic mode. Further, when the relay switch SW12 is in the closed state, the level of the voltage generated between the resistors R29 and R210 becomes the L level. Here, when the detection signal is input from the motion sensor 1 to the signal detection circuit 24, the level of the voltage output from the NOR circuit NOR1 changes from the H level to the L level. At this time, the level of the voltage output from the NOR circuit NOR3 changes to the H level, and the switching element Q2 is turned on. Then, when a current flows from the constant voltage circuit 22 to the set relay coil SC, the above-mentioned relay switch SW11 is closed. As a result, AC power is supplied from the commercial power supply AC to the lighting device 3, and the lighting device 3 is turned on. At this time, the relay switch SW12 is opened, and the voltage level generated between the resistors R29 and R210 becomes the H level. Then, the NOR circuit NOR3 outputs the L level voltage again, the switching element Q2 is turned off, and the current flowing through the set relay coil SC is cut off. At this time, since the relay switch SW11 is a latching relay, it maintains a closed state.

The input end of the inverter IN9 is connected between the resistors R29 and R210. In the NOR circuit NOR5, one input end is connected to the output end of the NOR circuit NOR4 of the timer circuit 27, and the other input end is connected to the output end of the inverter IN9. When the relay switch SW11 is in the closed state and the relay switch SW12 is in the open state, the level of the voltage output from the inverter IN9 becomes the L level. The level of the voltage output from the NOR circuit NOR5 changes according to the level of the voltage output from the NOR circuit NOR4. When the operation mode of the controller 2 is the automatic mode, in the timer circuit 27, after the voltage input from the output end of the NOR circuit NOR1 reaches the H level, it is output from the timer integrated circuit 271 when the above-mentioned reference time elapses. The voltage level is H level. At this time, the voltage level output from the NOR circuit NOR4 changes to the L level, the NOR circuit NOR5 outputs the H level voltage, and the switching element Q3 is turned on. Then, a current flows through the reset relay coil RC, the relay switch SW12 is closed, and the relay switch SW11 is open. As a result, the AC power supplied from the commercial power supply AC to the lighting device 3 is cut off, and the lighting device 3 is turned off. When the relay switch SW12 is closed, the voltage level generated between the resistors R29 and R210 becomes the L level, and the inverter IN9 outputs the H level voltage. Then, since the voltage at the output end of the NOR circuit NOR5 becomes the L level, the switching element Q3 is turned off and the current flowing to the reset relay coil RC is cut off. At this time, since the relay switch SW12 is a latching relay, it maintains a closed state.

Returning to FIG. 2, the human sensor 1 includes a detection element 11, a detection processing unit 12, a constant voltage circuit 14, a lighting control circuit 16, and a light emitting diode (hereinafter, “LED (Light Emitting Diode)” which is a light source for an indicator. It has 17 and a voltage drop circuit 15 and a diode bridge 13. The detection element 11 is, for example, a pyroelectric element, and changes the output voltage when the amount of infrared rays emitted from a person changes. When a person is detected by the detection element 11 and the output voltage of the detection element 11 changes, the detection processing unit 12 outputs a detection notification signal to the voltage drop circuit 15. The detection notification signal is an H level voltage signal. The voltage drop circuit 15 is connected to the detection processing unit 12, and when the detection notification signal is input from the detection processing unit 12, the line voltage of the signal line Ls is lowered from the first voltage V1 to the second voltage V2. The lighting control circuit 16 intermittently lights the LED 17 while the line voltage of the signal line Ls is reduced to the second voltage V2 by the voltage drop circuit 15. On the other hand, the lighting control circuit 16 turns off the LED 17 while the line voltage of the signal line Ls is maintained at the first voltage V1. The constant voltage circuit 14 and the voltage drop circuit 15 are connected to the terminals Te11 and Te12 to which the two-wire signal line Ls is connected via a diode bridge 13. By being connected to the terminals Te11 and Te12 via the diode bridge 13 in this way, the signal line Ls can be connected to the terminals Te11 and Te12 without considering the polarities of the terminals Te3 and Te4 of the controller 2. .. Therefore, there is an advantage that the construction work of the motion sensor 1 can be easily performed.

The constant voltage circuit 14 receives power from the controller 2 which is an external power supply via the signal line Ls, and outputs a constant drive voltage to the detection processing unit 12 and the lighting control circuit 16. The output voltage of the constant voltage circuit 14 is set lower than the second voltage V2, which is the line voltage of the signal line Ls in a state where the line voltage of the signal line Ls is dropped by the voltage drop circuit 15. As a result, fluctuations in the voltage output from the constant voltage circuit 14 to the detection processing unit 12 and the lighting control circuit 16 are suppressed. The lighting control circuit 16 intermittently lights the LED 17 by intermittently supplying a current to the LED 17 while the detection notification signal is output from the detection processing unit 12 to the voltage drop circuit 15.

As shown in FIG. 3, the voltage drop circuit 15 has a Zener diode ZD1 and a switching element Q1. The cathode of the Zener diode ZD1 is connected to the high potential side of the signal line Ls via the diode bridge 13. The switching element Q1 is a first switching element having one end connected to the anode of the Zener diode ZD1 and the other end grounded. Here, the switching element Q1 is, for example, an NPN type transistor, and when an H level voltage signal, which is a detection notification signal, is input from the detection processing unit 12 to the base, the switching element Q1 is turned on and the line voltage of the signal line Ls. Is reduced to the voltage between both ends of the Zener diode ZD1. That is, when a person is detected by the detection element 11 and the detection notification signal is output from the detection processing unit 12, the voltage drop circuit 15 outputs the detection signal to the controller 2 by lowering the line voltage of the signal line Ls. ..

In the LED 17, the anode is connected to the lighting control circuit 16 via the resistor R12, and the cathode is connected between the Zener diode ZD1 of the voltage drop circuit 15 and the switching element Q1.

The lighting control circuit 16 switches between a resistor R11 having one end connected to the output end VH2 of the constant voltage circuit 14 and a capacitor C1 having one end connected to the other end of the resistor R11 and the other end being grounded. It has an element 161 and a switch drive unit 162. The capacitor C1 is charged by supplying a current from the output terminal VH2 of the constant voltage circuit 14 through the resistor R11. The switching element 161 is a second switching element having one end connected between the capacitor C1 and the resistor R11 and the other end connected to the anode of the LED 17 via the resistor R12 which is the second resistance. The switching element Q1 is a semiconductor switch that is turned on when the voltage level output from the switch drive unit 162 is L level, and turned off when the voltage level is H level.

The switch drive unit 162 is a Schmitt trigger circuit in which the voltage at the output end changes with hysteresis with respect to the voltage change at the input end. Here, the Schmitt trigger circuit may be, for example, a circuit in which the voltage at the input end on the positive side of one operational amplifier is positively fed back to the output end, or may be a combination of two transistors. If the Schmitt trigger circuit uses one operational amplifier, the number of parts can be reduced. The switch drive unit 162 has an input end connected between the capacitor C1 and the resistor R11, and turns on and off the switching element 161 according to the charging voltage of the capacitor C1 generated between the capacitor C1 and the resistor R11. When the charging voltage of the capacitor C1 becomes equal to or higher than the first threshold voltage from a state lower than the first threshold voltage, the switch drive unit 162 outputs an L level voltage to the switching element 161 to turn on the switching element Q1. .. On the other hand, the switch drive unit 162 outputs an H level voltage to the switching element 161 when the charging voltage of the capacitor C1 becomes lower than the second threshold voltage from a state higher than the second threshold voltage lower than the first threshold voltage. Turns off the switching element 161.

Here, when a person is not detected by the detection element 11, the switching element Q1 is maintained in the off state, so that the potential of the cathode of the LED 17 becomes equal to the potential of the output end on the high potential side of the diode bridge 13. Therefore, no current flows through the LED 17. On the other hand, when a person is detected by the detection element 11, an H level voltage signal, which is a detection notification signal, is output from the detection processing unit 12 to the switching element Q1, the switching element Q1 is turned on, and the potential of the cathode of the LED 17 is raised. Equal to the ground potential. At this time, if the charging voltage of the capacitor C1 is equal to or higher than the first threshold voltage, the switch drive unit 162 outputs an L level voltage to the switching element 161 and the switching element 161 is maintained in the ON state. Then, a current is supplied from the capacitor C1 to the LED 17 through the switching element 161 to light the LED 17. Along with this, the charging voltage of the capacitor C1 gradually decreases.

After that, as the capacitor C1 is discharged, when the charging voltage of the capacitor C1 becomes lower than the second threshold voltage from a state higher than the second threshold voltage lower than the first threshold voltage to the second threshold voltage or less, the switch drive unit 162 sets the H level voltage. Output to the switching element 161. As a result, the switching element 161 is turned off, the current supply from the capacitor C1 to the LED 17 is cut off, and the LED 17 is turned off. When the switching element 161 is turned off, the capacitor C1 is charged by supplying a current from the constant voltage circuit 14 to the capacitor C1 via the resistor R11. Along with this, the charging voltage of the capacitor C1 gradually increases. Then, when the charging voltage of the capacitor C1 becomes equal to or higher than the first threshold voltage from a state lower than the first threshold voltage, the switch drive unit 162 outputs an L level voltage to the switching element 161. As a result, the switching element 161 is turned on again, a current is supplied from the capacitor C1 to the LED 17 through the switching element 161 and the LED 17 is turned on again. In this way, while a person is detected by the detection element 11 and the switching element Q1 is maintained in the on state, the switching element 161 repeats on / off operations in response to fluctuations in the charging voltage of the capacitor C1, so that the LED 17 is intermittent. Lights up.

For example, as shown in FIG. 4, the LED 17 is maintained in the off state while the detection element 11 does not detect a person and the voltage level output from the detection processing unit 12 is maintained at the L level. Here, at time T1, when the charging voltage VC1 of the capacitor C1 becomes the first threshold voltage VCM1 or more from the state lower than the first threshold voltage VCM1, the switch drive unit 162 outputs the L level voltage to the switching element 161. .. As a result, the switching element 161 is turned on. The capacitor C1 is charged until the upper limit of the charging voltage VC1max is reached.

Next, at time T2, when the level of the voltage output from the detection processing unit 12 changes to the H level when a person is detected by the detection element 11, a current is supplied from the capacitor C1 to the LED 17 through the switching element 161. As a result, the LED 17 is turned on. At this time, the capacitor C1 is discharged, and the charging voltage VC1 of the capacitor C1 is gradually reduced accordingly.

Subsequently, at time T3, when the charging voltage of the capacitor C1 becomes lower than the second threshold voltage from a state higher than the second threshold voltage lower than the first threshold voltage to the second threshold voltage or less, the switch drive unit 162 switches the H level voltage to the switching element. Output to 161. As a result, the switching element 161 is turned off again. Then, the capacitor C1 is charged again, and the charging voltage of the capacitor C1 gradually increases accordingly.

After that, at time T4, when the charging voltage of the capacitor C1 becomes equal to or higher than the first threshold voltage from a state lower than the first threshold voltage, the switch drive unit 162 outputs an L level voltage to the switching element 161. As a result, the switching element 161 is turned on again. Then, the capacitor C1 is discharged again, and the charging voltage of the capacitor C1 is gradually reduced accordingly. The period corresponding to the sum of the discharge period ΔTD and the charge period ΔTC of the capacitor C1 at this time corresponds to the intermittent lighting cycle of the LED 17.

As described above, in the human sensor 1 according to the present embodiment, the lighting control circuit 16 receives the drive voltage from the constant voltage circuit 14, and the line voltage of the signal line Ls is seconded by the voltage drop circuit 15. While the voltage drops to V2, the LED 17 is intermittently turned on. On the other hand, the lighting control circuit 16 turns off the LED 17 while the line voltage of the signal line Ls is maintained at the first voltage V1. As a result, the ratio of the time during which the LED 17 is lit while the motion sensor 1 is operating can be reduced, so that the power consumption of the motion sensor 1 is reduced.

Further, in the motion sensor 1 according to the present embodiment, since the power consumption of the motion sensor 1 is reduced, the power consumption of the controller 2 that supplies power to the motion sensor 1 is also reduced. There is also an advantage that it is easy to increase the number of motion sensors 1 that can be connected to 2.

Further, the voltage drop circuit 15 according to the present embodiment is a series circuit of the Zener diode ZD1 and the switching element Q1. Further, the lighting control circuit 16 includes a resistor R11, a capacitor C1, a switching element 161 and a switch drive unit 162 which is a Schmitt trigger circuit. As a result, the charging period ΔTC of the capacitor C1 can be changed and the intermittent lighting cycle of the LED 17 can be changed only by changing the resistance value of the resistor R11 to be used or the capacitance of the capacitor C1 to be used. There is an advantage that it is easy to respond to the specification change required for the sensor 1. Further, the lighting control circuit 16 is simplified as compared with a lighting control circuit that intermittently lights the LED 17 by using, for example, an MPU (Micro Processing Unit), and has an advantage that it is easy to manufacture. Further, since the lighting control circuit 16 does not include the MPU, there is an advantage that the power consumption in the lighting control circuit 16 is reduced. Further, in the motion sensor 1 according to the present embodiment, when a person is detected by the detection element 11, the LED 17 is turned on by the discharge current of the capacitor C1, so that the time from when the person is detected until the LED 17 is turned on. Can be shortened, and visibility is improved accordingly.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments. For example, the other end of the capacitor C1 of the lighting control circuit 16 of the motion sensor 1 may be connected between the Zener diode ZD1 of the voltage drop circuit 15 and the switching element Q1. In this case, charging of the capacitor C1 is started after a person is detected by the detection element 11 and the switching element Q1 is turned on.

In the embodiment, an example in which the detection element 11 is a pyroelectric element has been described, but the present invention is not limited to this, and for example, the detection element 11 is an element that detects the presence of a person by using visible light or ultrasonic waves. There may be.

Although the embodiments and modifications of the present invention (including those described in the description; the same shall apply hereinafter) have been described above, the present invention is not limited thereto. The present invention includes a combination of embodiments and modifications as appropriate, and modifications thereof as appropriate.

The present invention is suitable for a lighting system equipped with a motion sensor.

1 Human sensor, 2 Controller, 3 Lighting device, 4 Monitoring device, 11 Detection element, 12 Detection processing unit, 13 Diode bridge, 14, 22 Constant voltage circuit, 15 Voltage drop circuit, 16 Lighting control circuit, 17 LED, 21 Power supply circuit, 24 signal detection circuit, 25 operation mode switching circuit, 26 load control circuit, 27 timer circuit, 28 operation mode notification circuit, 29 load control status notification circuit, 161, Q1, Q2, Q3 switching element, 162 switch drive unit , 210 current limit circuit, 211 rectification smoothing circuit, 241 reference voltage source, 251 operation mode setting circuit, 271 timer integrated circuit, AC commercial power supply, C1 capacitor, CMP comparator, IN9 inverter, Lc control line, Lp power supply line, Ls signal line, NOR1, NOR3, NOR4, NOR5 NOR circuit, Q11, Q12 transistor, R11, R12, R29, R210 resistor, RC reset relay coil, RM living room, SC set relay coil, SW11, SW12 relay switch, T transformer , Te1, Te2, Te3, Te4, Te11, Te12 terminal, To1, To2 output terminal, ZD1 Zener diode, VH1, VH2, VL1 output terminal

Claims (4)

A detection element that detects people and
A constant voltage circuit that receives power from an external power supply via a signal line and outputs a constant drive voltage.
A detection processing unit that receives the drive voltage from the constant voltage circuit and outputs a detection notification signal when a person is detected by the detection element.
A voltage drop circuit that is connected to the detection processing unit and drops the voltage of the signal line from the first voltage to a second voltage lower than the first voltage when the detection notification signal is input from the detection processing unit.
Light source and
Upon receiving the drive voltage from the constant voltage circuit, the light source is intermittently turned on while the voltage of the signal line is dropped to the second voltage by the voltage drop circuit, and the voltage of the signal line is the voltage of the signal line. A lighting control circuit that turns off the light source while being maintained at the first voltage is provided.
The voltage drop circuit is
A Zener diode whose cathode is connected to the high potential side of the signal line,
It has a first switching element, one end connected to the anode of the Zener diode, the other end grounded, and turned on and off in response to the detection notification signal input from the detection processing unit.
The light source is a light emitting diode whose cathode is connected between the anode of the Zener diode and the first switching element.
The lighting control circuit is
A capacitor whose one end is connected to the output end on the high potential side of the constant voltage circuit via the first resistance and whose other end is grounded.
A second switching element having one end connected to the one end of the capacitor and the other end connected to the anode of the light emitting diode via a second resistor.
It has a switch drive unit that turns the second switching element on and off according to the charging voltage of the capacitor.
The intermittent lighting cycle of the light source is determined based on the period corresponding to the sum of the discharge period and the charge period of the capacitor.
Motion sensor. The switch drive unit
When the charging voltage becomes equal to or higher than the first threshold voltage from a state lower than the first threshold voltage, the second switching element is turned on and the charging voltage becomes higher than the second threshold voltage lower than the first threshold voltage. When the voltage becomes lower than the second threshold voltage from a high state, the second switching element is turned off.
The motion sensor according to claim 1 . The switch drive unit is a Schmitt trigger circuit.
The motion sensor according to claim 2 . A detection element that detects people and
A constant voltage circuit that receives power from an external power supply via a signal line and outputs a constant drive voltage.
A detection processing unit that receives the drive voltage from the constant voltage circuit and outputs a detection notification signal when a person is detected by the detection element.
A voltage drop circuit that is connected to the detection processing unit and drops the voltage of the signal line from the first voltage to a second voltage lower than the first voltage when the detection notification signal is input from the detection processing unit.
Light source and
Upon receiving the drive voltage from the constant voltage circuit, the light source is intermittently turned on while the voltage of the signal line is dropped to the second voltage by the voltage drop circuit, and the voltage of the signal line is the voltage of the signal line. A human sensor having a lighting control circuit that turns off the light source while being maintained at the first voltage is provided.
The voltage drop circuit is
A Zener diode whose cathode is connected to the high potential side of the signal line,
It has a first switching element, one end connected to the anode of the Zener diode, the other end grounded, and turned on and off in response to the detection notification signal input from the detection processing unit.
The light source is a light emitting diode whose cathode is connected between the anode of the Zener diode and the first switching element.
The lighting control circuit is
A capacitor whose one end is connected to the output end on the high potential side of the constant voltage circuit via the first resistance and whose other end is grounded.
A second switching element having one end connected to the one end of the capacitor and the other end connected to the anode of the light emitting diode via a second resistor.
It has a switch drive unit that turns the second switching element on and off according to the charging voltage of the capacitor.
The intermittent lighting cycle of the light source is determined based on the period corresponding to the sum of the discharge period and the charge period of the capacitor.
Lighting system.

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