JP3533928B2 - 2-wire wiring device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a two-wire wiring device.

[0002]

2. Description of the Related Art FIGS. 3 to 6 are block diagrams illustrating different conventional two-wire wiring devices.

Conventionally, as shown in FIG. 3, when a person approaches, the load opening / closing section 53 is automatically turned on to supply the commercial power source 1 to the lighting fixture 2 corresponding to the load and light the same. A load detection switch with a human body detection function, which is used for automatic lighting control of the lighting fixture 2, in which the supply of the commercial power source 1 to the lighting fixture 2 is cut off by automatically turning off the load opening / closing unit 53 when moving away There is a device 50. The load opening / closing device 50 with a human body detecting function includes a power supply unit 51, an operating unit 52, and a load opening / closing unit 53. Operation unit 52
Is a portion that drives the load opening / closing unit 53, and includes an opening / closing control unit 52a, an infrared sensor unit 52b, and a daylight sensor unit 52.
and c.

The power supply unit 51 converts the alternating current supplied from the commercial power supply 1 into a constant voltage of direct current and constantly supplies power to the operation unit 52 (that is, the opening / closing control unit 52a, the infrared sensor unit 52b and the daylight sensor unit 52c). To do. The operation unit 52 always operates by receiving power from the power supply unit 51.

The infrared sensor section 52b operates by receiving power from the power source section 51, has a predetermined sensing area (not shown), and detects infrared rays from the human body passing through the sensing area. The human body detection signal is output to the opening / closing control unit 52a.
Output to.

The daylight sensor section 52c operates by receiving power from the power source section 51, constantly detecting the ambient illuminance which is the brightness of the surroundings, and the ambient illuminance higher than the predetermined illuminance value. When is darker, a dark signal that tells that the ambient illuminance is darker than a predetermined illuminance value set in advance,
Output to the opening / closing control unit 52a.

The opening / closing control unit 52a operates by receiving power from the power supply unit 51, and supplies the commercial power supply 1 to the luminaire 2 based on the logical product (AND) of the dark signal and the human body detection signal. Every time a judgment is made and the judgment result changes from NO to NO, the load switch 53 is turned on for a predetermined time to turn on the lighting fixture 2, and then the load switch 53 is turned on again.
Is turned off to turn off the lighting fixture 2.

Therefore, in the load switching device 50 with the human body detection function as described above, the commercial power source 1 → the load switching unit 53.
→ Lighting equipment 2 → Commercial power supply 1 besides the closed circuit of commercial power supply 1
→ power supply unit 51 → must be secured closed circuit of the operation unit 52 → the commercial power source 1, the four wire connection terminals T _1, ... T ₄ must comprise, of the human body detection function with load switching devices 50 At the time of installation, there was a problem in that wiring was increased.

In order to solve the above-mentioned problems, only the two electric wire connecting terminals are provided, and the power source unit 51, the operating unit 52, the load opening / closing unit in the load switching device 50 with the human body detection function described above. 53 can be built in.
A two-wire wiring device shown in No. 133535 is known.

The two-wire type wiring device disclosed in JP-A-1-133535 is a remote control adapter 6 as shown in FIG.
It is 0. This remote control adapter 60 includes two electric wire connection terminals T _{1 and} T ₂ and has a power supply unit 61 inside.
An operating unit 62, a load switching unit 63, and an auxiliary circuit 64 are provided. The operation unit 62 includes an opening / closing control unit 62a and an opening / closing control unit 6
The remote control signal receiving unit 62b for giving an instruction to 2a.

In the remote controller adapter 60 shown in FIG. 4, the auxiliary circuit 64 is connected to the circuit including the load 2 in parallel with the load switching unit 63, and the load switching unit 6 is connected.
It has an impedance that can reduce the load voltage to a level that does not drive the load 2 when 3 is off. The power supply unit 61 is connected to a circuit including the load 2 in series with the load switching unit 63 and the auxiliary circuit 64, respectively.
Regardless of whether the load switching unit 63 is turned on or off, the operation unit 62
(Opening / closing control unit 62a and remote control signal receiving unit 62b)
Always power.

However, in the above-described conventional two-wire wiring apparatus, the power supply unit 61 is always provided in the circuit including the load 2 in order to always function the power supply unit 61 regardless of whether the load switching unit 63 is turned on or off. They are inserted in series. Moreover, in order to always output a constant voltage stably from the power supply unit 61 connected in this way, a constant voltage element such as a constant voltage diode is used, but the load 2 is driven when the load switching unit 63 is off. Since the impedance of the auxiliary circuit 64 connected in parallel to the load switching unit 63 is increased so that the load switching unit 63 does not turn on, the current flowing through the power supply unit 61 turns on / off the load switching unit 63.
It will be significantly different depending on the off.

This means that the output voltage of the power supply section 61 becomes unstable and a large current capacity element is used in order to withstand the inrush current when the load is turned on (the load switching section 63 is turned on). Therefore, it is necessary to take measures against heat generation, which leads to increase in size and cost. In addition, inverter type fluorescent lighting fixtures, etc., which have become popular due to energy saving in recent years, are much more prone to load loads than conventional incandescent lighting fixtures and fluorescent lighting fixtures that use iron-copper type ballasts. A large rush current flows, and elements such as the constant voltage diode of the power supply unit 61 are easily destroyed. Therefore, although a circuit for preventing the destruction of the element is required, there is a problem that the circuit configuration becomes very complicated.

Therefore, in order to solve the above-mentioned problems, the present inventors stably supply power to the operation unit regardless of the change of the load impedance and the ON / OFF state of the load switching unit. Invented a two-wire wiring device as shown in Japanese Patent Application No. 9-204533.

The two-wire type wiring device disclosed in Japanese Patent Application No. 9-204533 is a load switchgear 70 with a human body detecting function as shown in FIGS. The load switchgear 70 with a human body detection function shown in FIG. 5 includes two electric wire connection terminals T _{1 and} T ₂ , and internally has a rectifying circuit section 71 and a power supply section 7.
2, an auxiliary power supply circuit 73, an operation unit 74, and a load opening / closing unit 75. The operation unit 74 includes an opening / closing control unit 74a,
The infrared sensor section 74b and the daylight sensor section 74c are included. Further, the load switchgear 70 with a human body detection function shown in FIG. 6 is newly provided with power supply means 76 in the case where the auxiliary power supply circuit 73 of the load switchgear 70 with a human body detection function shown in FIG. 5 is not provided.

Load switchgear 7 with human body detection function shown in FIG.
In 0, the power supply unit 72 is connected in parallel to the load switching unit 75, and the power supply unit 72 applies the load voltage to a level that does not drive the load 2 when the load switching unit 75 is in the OFF state. Equipped with impedance that can be reduced. Further, the auxiliary power supply circuit 73 stably supplies power to the operation unit regardless of the impedance change of the load 2 and the ON / OFF state of the load switching unit 75.

A load switchgear 7 with a human body detecting function shown in FIG.
In 0, since the power supply means 76 always inputs a part of the energy of the current flowing through the load switching section 75 to the input section of the power source section 72, the load opening / closing apparatus 70 with human body detection function shown in FIG. It is possible to continuously supply power to the switching control section 74a for a long time even without the auxiliary power supply circuit 73 as described above, and to continuously load the load switching section 75a for a long time.
Allows you to turn on.

[0018]

However, in the two-wire wiring device shown in FIG. 5, when the power is not supplied from the power source 72, that is, when the load switching unit 75 remains on for a long time, the auxiliary power supply circuit is provided. Since the electric charge stored in 73 is completely consumed by the operating unit 74, there is a limit to supplying power to the operating unit 74 for a long time. Further, in the two-wire wiring device shown in FIG. 6, the power is not supplied from the power supply 72, that is, the load opening / closing unit 7
When the fifth on-state also, for feeding to the operation unit 7 4, but is provided with a power supply means 76 such as a transformer, in size since a large load current is also need the capacity to withstand, There is a problem in that it is disadvantageous in terms of downsizing because it is necessary to secure the installation location.

The present invention has been made to solve the above problems, and its purpose is to reduce the influence of the impedance of the load and the change of the load current depending on the ON / OFF state of the load switching unit. An object of the present invention is to provide an excellent two-wire wiring device that can be downsized regardless of size.

[0020]

In order to solve the above problems, the present invention provides a load switching unit for controlling on / off of supply of commercial power to a load, and a load. A phase detection unit that outputs a phase signal when the rectified voltage of the voltage across the switching unit reaches a predetermined reference voltage,
When supplying commercial power to the load, the drive circuit unit that turns on the load switching unit every half cycle of the commercial power supply based on the phase signal output from the phase detection unit, and whether or not commercial power is supplied to the load An operation unit that gives an instruction to the drive circuit unit, a power supply unit that supplies power to the operation unit using the voltage across the load switching unit, and if the power supply unit is connected to the output side of the power supply unit and the power supply unit cannot supply power to the operation unit It is connected to the auxiliary power supply circuit that supplies power and is connected to the preceding stage of the power supply unit, and is set to a first impedance value when the necessity instruction is required, and is set to a second impedance value that is larger than the first impedance value when it is not required. Half cycle of commercial power supply with variable limit block
Each time the phase of the commercial power supply starts from 0 degree phase angle
The first impedance until the phase signal is output
It is characterized in that power is supplied to the power supply unit via the threshold value .

According to a second aspect of the present invention, the impedance value of the variable limit block is a third impedance value smaller than the second impedance value during the charging period of the auxiliary power supply circuit when the commercial power supply is initially turned on. It is characterized by being

According to the third aspect of the invention, even if the current consumption of the operating portion changes in accordance with the change of the state of the operating portion,
A dummy load for adjusting the total output current of the power supply unit to be substantially constant is provided on the output side of the power supply unit.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a two-wire wiring device according to the present invention will be described in detail below with reference to FIGS. 1 and 2. FIG. 1 is a block diagram showing a two-wire wiring device. 2A and 2B are timing charts for explaining the operation of the two-wire wiring device. FIG. 2A is a waveform of a commercial power supply, FIG. 2B is an output waveform of a rectifier circuit unit, and FIG. 2C is an input waveform of a power supply unit.
(D) is the output waveform of the power supply unit, (e) is the output waveform of the phase detection unit, (f) is the output waveform of the infrared sensor unit, (g) is the output waveform of the daylight sensor unit, and (h) is the operation unit. Output waveform of
(I) is an on / off waveform of the switch S ₁ , (j) is an on / off waveform of the switch S ₂ , (k) is an on / off waveform of the switch S ₃ , and (l) is on / off of the switch S _4. Waveforms, (m) is an output waveform of the drive circuit unit, (n) is an on / off waveform of the load switching unit, and (o) is a time axis.

In FIG. 1, reference numeral 1 is a commercial AC power supply of 100 VAC, 2 is a load such as a lighting device which is controlled to be turned on / off, and 10 is a load switch with a human body detection function corresponding to a two-wire wiring device. is there. As shown in FIG. 1, the load switchgear 10 with a human body detection function has two wire connection terminals T _1,
As it has a T _2, within a rectifier circuit 11, a power supply unit 12, an auxiliary power supply circuit 13, an operation unit 14, a load switching unit 15, a drive circuit section 16, a phase detector 17, Variable limit block 18, control unit 19, and dummy load 20
With.

The rectifier circuit section 11 is a section for rectifying an AC voltage obtained from the commercial power source 1 including the load 2, and is composed of a diode bridge or the like. One input section of the diode bridge is connected to the electric wire connecting terminal T ₁ . The other input part of the diode bridge is connected to the wire connection terminal T ₂ , respectively.
The power supply unit 12 includes a smoothing capacitor C in the input unit, removes a ripple component from the pulsating current voltage supplied via the rectifier circuit unit 11 for smoothing, and converts the voltage to a predetermined voltage before the auxiliary power supply circuit. 13 is a portion for supplying power to the operation unit 14 and the operation unit 14, and is configured by a three-terminal regulator or the like.

The auxiliary power supply circuit 13 supplies power to the operation unit 14 instead of the power supply unit 12 when the load switching unit 15 is in the ON state and the power supply unit 12 cannot supply the predetermined power to the operation unit 14. It is supplied, and is composed of a storage element such as an electrolytic capacitor.

The operation section 14 is a section which is constantly operated by being supplied with power from the power supply section 12 or the auxiliary power supply circuit 13, and includes a judgment processing section 14a, an infrared sensor section 14b, and a daylight sensor section 14c. To be done. Infrared sensor section 1
4b is always operated by receiving power from the power supply unit 12 or the auxiliary power supply circuit 13, and has a predetermined sensing area (not shown).
When the infrared ray emitted from the human body passing through the sensing area is detected, the human body detection signal is output to the determination processing unit 14a. Once the human body detection signal from the infrared sensor section 14b is output, a timer circuit (not shown) continues for a predetermined time and then stops.

The daylight sensor section 14c receives power from the power supply section 12 or the auxiliary power supply circuit 13, and is always operating.
For example, it is composed of a CdS light receiving element or a photodiode, and constantly detects the ambient brightness, that is, the ambient illuminance, and when the ambient illuminance is darker than a predetermined illuminance value set in advance, a dark signal indicating that is determined. Processing unit 14a
Output to.

The determination processing section 14a is always operated by receiving power from the power source section 12, and uses the logical product (AND) of the dark signal and the human body detection signal with respect to the drive circuit section 16 to open / close the load. A drive signal instructing to turn on 15 is output. In addition, the determination processing unit 14a uses the switches S _1, S _2, S ₃
To the switch S ₄ directly via the control unit 19 as follows.

In other words, the judgment processing section 14a does not charge the auxiliary power supply circuit 13 as when the load switchgear 10 with human body detection function is connected to the commercial power supply 1 including the load 2 for the first time. For a few seconds when the voltage applied to the operation unit 14 does not reach the predetermined voltage, the switch S ₁ remains in the ON state and the switches S _2, S _3, S ₄ maintain the OFF state in the normal state. When the voltage applied to the section 14 reaches a predetermined voltage, an instruction is given to turn off the switches S _{1 and} S ₃ and turn on the switches S _{2 and} S ₄ . And
The load switch with human body detection function 10 includes switches S _1, S ₃
Is in the off state and the switch S ₂ is in the on state, which is the standby state.

The determination processing section 14a uses the logical product (AND) of the dark signal and the human body detection signal to instruct the drive circuit section 16 to turn on the load opening / closing section 15, Switch S ₃ is turned on and switches S _1, S _2,
Instruct to turn off S ₄ . Then, the load switchgear 10 with a human body detection function is in an operating state in which the switch S ₃ is on and the switches S _1, S _2, S ₄ are off.

Further, the judgment processing section 14a is provided with the presence / absence of a human body detection signal from the infrared sensor section 14b, the presence / absence of a dark signal from the daylight sensor section 14c, and the daylight sensor section 14 due to changes in ambient illuminance.
The dummy load 20 keeps the total load current of the power supply unit 12 constant so that the input impedance of the power supply unit 12 does not change due to the change of the total current consumption of the operation unit 14 caused by the state change of c. The ON / OFF control of the switch S ₄ is performed in order to adjust the current consumption of the switch and to always enable stable power supply. Specifically, a switching element such as a transistor or FET is used as the switch S ₄ , and a resistor is used as the dummy load 20.

The load switching section 15 is connected to the load circuit section 16 from the drive circuit section 16.
Wire connection terminal T based on the ON instruction_1,T₂Short circuit between
The part to be put in a state, for example, triac or siri
A semiconductor switching element such as a star is used.
The phase detector 17 is configured as a comparison circuit for the reference voltage.
Monitor the full-wave rectified waveform output from the rectifier circuit section 11.
And the full-wave rectified waveform has a preset reference voltage
Phase angle θ reaching ₁To θ₂High only during the period
Output the phase signal. The reference voltage of the phase detector 17 is almost
It is set to about 50V and the impedance of load 2 is low.
In some cases, the phase detector 17 may be half
Phase angle θ₁= 20 degree to phase angle θ₂= 160
It outputs a phase signal that goes high over time. Drive circuit section
16 is a phase signal output from the phase detector 17
The logical product (AND) with the drive signal output from the processing unit 14a
Thus, the load switching unit 15 is instructed to turn on.

The variable limit block 18 includes a switch S._1,S
_2,S_3,And impedance Z_1,Z_2,Z ₃With. variable
The limit block 18 is a switch S₁And impedance Z
₁Series circuit with switch S₂And impedance Z₂
Series circuit with switch S ₃And impedance Z₃When
It is configured as a parallel circuit with a series circuit of. Inn
Peedance Z_1,Z_2,Z₃The magnitude relationship between the values of Z is₃<Z₁
<Z₂There is a relationship of, for example, impedance Z₁Is 2
0KΩ, impedance Z₂Is 1 MΩ, impedance
Z₃Is set to 200Ω. The control unit 19 includes the determination processing unit 1
Based on the instruction from 4a, the switch S_1,S_2,S₃The
This is the part that controls the on / off.

The load switchgear 10 with the human body detection function described above is connected as follows. That is, the wire connection terminal T ₁ is connected to _one of the commercial power sources 1. The wire connection terminal T ₂ is connected to the other side of the commercial power supply 1 via the load 2. Further, the electric wire connection terminals T _{1 and} T ₂ are respectively connected in parallel with the input section of the rectifier circuit section 11 and the load switching section 15.

The drive circuit section 16 and the phase detection section 17 are connected in parallel between the anode output section and the cathode output section of the rectification circuit section 11. The anode output section of the rectifier circuit section 11 is connected to the anode of the smoothing capacitor C and the input section of the power supply section 12 via the variable limiting block 18. The common portion between the cathode of the smoothing capacitor C and the power supply unit 12 is the rectifier circuit unit 1
1 cathode output. Between the output section of the power supply section 12 and the common section of the power supply section 12, a series circuit of the switch S ₄ and the dummy load 20, the auxiliary power supply circuit 13, the determination processing section 14a, the infrared sensor section 14b, Daylight sensor unit 14
and c are connected in parallel.

Next, the human body detector configured as described above
The operation of the function load switchgear 10 will be described with reference to FIG.
It The load switch 10 with human body detection function
Installation work is done when the environment is bright and commercial power including load 2
Wire connection terminal T for source 1_1,T₂Connection is made through
Tick t₀Then, the supply of AC100V is started. Then the person
The load switchgear 10 with a body detection function is applied to the operation unit 14.
Time t when the voltage does not reach the predetermined voltage₀To t₁Number up to
For a second, the switch S is in the off state with the switch S ₁Is on
Switch S in the state_2,S_3,S_FourIs in the off state, the so-called
-Maintain a round state.

That is, during the several seconds from the time t ₀ to the time t _{1, the} rectification circuit section 11 is not connected via the load 2.
The commercial power source 1 to the AC 10 as shown in FIG.
0V is applied. Then, the rectifier circuit unit 11 turns the AC1
Full-wave rectification is applied to 00V to output a voltage as shown in FIG. At this time, the variable limit block 18
At, an impedance Z _{1 of} 20 KΩ has been selected. Accordingly, the input portion of the power supply unit 12, commercial power supply 1 through the load 2 and the rectifier circuit 11 and the impedance Z ₁
As a result, a considerably large amount of power is supplied to the smoothing capacitor C, and a considerably large amount of power can be output from the output section of the power source section 12 and the auxiliary power source circuit 13 is supplied. The electricity is also stored rapidly, and the voltage can be established for the operation unit 14 in a short time of several seconds.

In this way, the input / output voltage of the power supply unit 12
Is established, the phase detection unit 17 and the operation unit 14
That is, the determination processing unit 14a, the infrared sensor unit 14b, and the daylight
The sensor unit 14c starts the original operation. And
The phase detection unit 17 uses the full-wave rectification output from the rectification circuit unit 11.
Phase angle θ at which the waveform reaches the preset reference voltage ₁
To θ₂The phase signal that becomes High only during the period of
Output every half cycle of.

The determination processing section 14a outputs a standby state signal to the control section 19 to bring the variable limit block 18 into a standby state in which the switches S _{1 and} S ₃ are off and the switch S ₂ is on. , The impedance Z ₂ of 1 MΩ is selected for the variable limit block 18 to reduce the input voltage to the power supply unit 12, and the switch S ₄ is turned on to stabilize the output of the power supply unit 12 by the dummy load 20. Start extra power consumption to turn on. At this time, since the human body detection function-equipped load switching device 10 passes only a small amount of current, the load 2 is not turned on or driven.

[0041] Then, as from time t ₁ to time t ₂ in the standby state until t _3, even when the daylight sensor unit 14c does not output a dark signal, the infrared sensor unit 14b in FIG. 2 (f) Although the human body detection signal may be output as shown in FIG. 3, the determination processing unit 14a instructs the drive circuit unit 16 to turn on the load opening / closing unit 15 using a logical product (AND) of the dark signal and the human body detection signal. Since it is a thing, time t
_In No. ₂ , the drive circuit unit 16 and the load switching unit 15 do not change at all, and the load switching device with human body detection function 1
Since 0 supplies only a small current, the load 2 does not turn on or drive. Although not shown, the daylight sensor unit 14c outputs a dark signal, but the infrared sensor unit 1 does not.
Similarly, even when 4b does not output a human body detection signal, there is no change in the drive circuit unit 16 and the load switching unit 15, and the human body detection function-equipped load switching device 10 allows only a small current to flow. The load 2 does not turn on or drive.

After that, when it becomes dark at night and the surroundings become dark, the daylight sensor section 14c outputs a dark signal to the judgment processing section 14a. Then, the human body, such as a visitor is detected by the infrared sensor unit 14b, as shown at time t _3, with respect to the determination processing section 14a, the infrared sensor unit 14
b outputs a human body detection signal, and the daylight sensor unit 14c is in a state of outputting a dark signal.

Then, during the period from the time t ₃ to the time t ₉ , the judgment processing unit 14a, that is, the operation unit 14 controls the drive circuit unit 16 as shown in FIG.
5 is turned on, the control unit 19 is instructed to turn on the switch S ₃ and the switches S _{1 and} S ₂ are turned off, and at the same time, the switch S ₄ is turned off.

That is, from time t ₃ to time t ₉ ,
The switch S ₁ is in the off state as shown in FIG. 2 (i), the switch S ₂ is in the off state as shown in FIG. 2 (j), and the switch S ₃ is in the on state as shown in FIG. 2 (k). , The switch S ₄ maintains the off state as shown in FIG.
In addition, from time t ₃ to time t ₉ , the drive circuit unit 16
As shown in FIG. 2 (m), AC1 from the commercial power source 1
A trigger pulse for turning on the load switching unit 15 is output to the load switching unit 15 every half cycle in which the phase of 00V becomes the phase angle θ ₁ .

Therefore, the load switching unit 15 operates from the commercial power source 1 to the time t ₃ to the time t ₉ as shown in FIG. 2 (n).
For each half cycle of AC100V from AC to ON, the phase of AC100V is turned on during the period from the phase angle θ ₁ to about 180 degrees, and the load 2 receives A from the commercial power supply 1
C100V is applied to bring the load 2 into a lighting state or a driving state.

Note that the determination processing unit 14a uses the switch S_FourTo
The reason why the judgment processing unit 14a is turned off is that the driving circuit unit is
16 an instruction signal for turning on the load switching unit 15
And outputs a switch S to the control unit 19.₃
Switch S to ON_1,S ₂To turn off the
Signal is output, the power consumption of the operation unit 14 is low.
However, the apparent power consumption of the power supply unit 12
Stabilize the power supply of the power supply unit 12 by keeping it constant
This is because

When 100 VAC from the commercial power source 1 is applied and the load 2 is turned on or driven, the load opening / closing section 15 is not always turned on regardless of the phase of the 100 VAC, but the commercial power source 1 is used. For each half cycle of AC100V, the phase of AC100V from the commercial power source 1 is turned on during the period until the phase angle θ ₁ becomes approximately 180 degrees, and the phase is changed from the phase angle 0 degree to the phase angle θ ₁ . The reason for turning off during the period is that the load switching unit 1
This is because the rectifying circuit section 11 connected in parallel to both ends of the power supply circuit 5, that is, the power supply section 12 is supplied with power enough to allow the operation section 14 to stably operate through the impedance Z ₃ of 200Ω.

In other words, the load switching unit 15 is turned on for every half cycle of AC100V from the commercial power source 1 until the phase of AC100V from the commercial power source 1 becomes approximately 180 degrees from the phase angle θ ₁ . Therefore, the phase angle θ
_{Although the} rectifier circuit unit 11 cannot supply power to the power supply unit 12 from the period of ₁ to about 180 degrees, the power supply unit 12 consumes the electric charge stored in the smoothing capacitor C during this period. While supplying electric power to the operation unit 14, the insufficient electric power is discharged by supplying the auxiliary power supply circuit 13.

Then, every half cycle of AC100V from the commercial power source 1, during the period from the phase angle of 0 degree to the phase angle θ ₁ of the phase of AC100V from the commercial power source 1,
The rectifier circuit unit 11 supplies power to the power supply unit 12 and charges the smoothing capacitor C, and the power supply unit 12 supplies power to the operation unit 14 and charges the auxiliary power supply circuit 13.

Note that the variable limit block 18 is controlled so as to select the lowest impedance Z ₃ of 200Ω from the time t ₃ to the time t _9.
As shown in FIG. 2B, the full-wave rectified waveform output from 1 is
Since the phase of AC100V from the commercial power source 1 is only a slight low voltage period from the phase angle 0 degree to the phase angle θ ₁ , the smoothing capacitor C is charged with high efficiency and without attenuation, and the power source unit 12 is charged. This is because the power is sufficiently supplied.

Further, as shown in FIG. 2 (e), phase detection
The output of section 17 is time t₃From time t ₉Going high
The short period is for every half cycle of the commercial power supply 1.
The full-wave rectified waveform output from the rectifier circuit unit 11 is preset
Phase angle θ₁From High to High
At the same time that the signal is output, the load switching unit 15 is turned on.
And the voltage across the load switching unit 15 becomes approximately zero volts,
The full-wave rectified voltage waveform output by the rectifier circuit unit 11 is also shown in FIG.
As shown in (b), the phase angle θ₁From 180 degree phase angle
This is because it becomes almost zero volt.

As described above, from time t ₃ to time t ₉
Although the load 2 is turned on or driven by applying AC 100 V from the commercial power source 1, the timer circuit (not shown) of the infrared sensor unit 14b times up and the infrared sensor unit 14b detects the human body. If you stop the output of the signal at time t _9, the determination processing section 14a outputs the wait state signal to the control unit 19, a variable restriction block 18 switches S _1, S ₃ is the switch S ₂ in the off-state on The variable limit block 18 is put in the standby state.
The impedance Z ₂ of 1 MΩ is selected to reduce the input voltage to the power source unit 12, and the switch S ₄ is turned on to set the dummy load 20 to the power source unit 12.
Since the extra power consumption for stabilizing the output of (3) is started, the human body detection function-equipped load switching device 10 again enters the standby state similar to that from the time t ₁ to the time t ₃ . At this time, the load switch with human body detection function 10
Since only a small amount of current flows, the load 2 does not turn on or drive.

That is, the two-wire type arrangement configured as described above.
According to the load switchgear 10 with a human body detection function corresponding to a wire appliance
If so, the power supply unit 12 is configured such that when the commercial power supply 1 is turned on, the power supply unit 1
Auxiliary power supply circuit 13 and operation unit 14 which are connected to the output unit 2
(Judgment processing unit 14a, infrared sensor unit 14b, daylight sensor
Power supply to the body part 14c) and a human body detector
The function load switchgear 10 can quickly charge the auxiliary power supply circuit 13.
Effective impedance Z ₁Human body detection function
The load switchgear 10 with load must be ready for operation.
You can

In the standby state such as from time t ₁ to time t ₃ , the auxiliary power supply circuit 13 and the operation unit 14 (determination processing unit 14) connected to the output unit of the power supply unit 12 are connected.
a, the infrared sensor section 14b, and the daylight sensor section 14c), power is supplied to the load switchgear 10 with the human body detection function when the load switchgear 15 is off. Since it has the impedance Z ₂ , the load 2 can be surely brought into an inoperable state (state in which it cannot be lit or driven).

Further, in the operating state such as from time t ₃ to time t ₉ , the load switching section 15 is turned on / off by the reference voltage in which the full-wave rectified waveform output from the rectifier circuit section 11 is preset. Since the phase is controlled based on the phase signal output from the phase detection unit 17, which becomes High only during the period from the phase angle θ ₁ to the angle θ ₂ which reaches, the lighting or driving of the load 2 and the operation unit 14 (determination processing It is possible to be compatible with the power supply to the section 14a, the infrared sensor section 14b, and the daylight sensor section 14c).

Furthermore, even if the impedance of the load 2 changes due to a change in the type of the load 2 from, for example, a fluorescent lighting fixture to an incandescent lighting fixture, the operating unit 14
Stable power supply can be performed to the (determination processing unit 14a, infrared sensor unit 14b, daylight sensor unit 14c).

Furthermore, the operation unit 1 is connected to the output unit of the power supply unit 12.
Although a series circuit of the switch S ₄ and the dummy load 20 is inserted in parallel with ₄ to cause the dummy load 20 to consume extra power, operation is performed so as to keep the total output power of the power supply unit 12 substantially constant. The switch S according to the power consumption state of the section 14
_{Since 4} is controlled to be turned on / off, stable power supply to the operation unit 14 can be performed without changing the input impedance of the power supply unit 12 even if the current consumption of the operation unit 14 changes. Will be possible.

The present invention is not limited to the above embodiment, but the rectifier circuit section 11 can be omitted by making the power supply section 12 compatible with AC, and the load switching section 15 can be omitted. Can be controlled by a switching element such as a transistor, an FET, or a thyristor by connecting the output side of the rectifier circuit section 11, and the impedance Z _{2 of the} variable limit block 18 can be controlled as necessary.
And the impedance Z ₃ may be commonly used.

In the above embodiment, the operation unit 14
Although the infrared sensor section 14b and the daylight sensor section 14c are included in the above, the invention may include a control signal receiving section from a wireless remote controller. Various modifications are possible within the range,
It includes all modified aspects.

[0060]

According to the first aspect of the invention, it is not necessary to use a transformer as in the prior art, and it has a simple structure, but is not affected by changes in the impedance of the load and the on / off state of the load switching section. It is possible to provide stable power supply to the operation unit regardless of the above, and to provide an excellent two-wire wiring apparatus that can be further downsized.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, when the power is turned on, the auxiliary power supply circuit can be rapidly charged from the power supply part, and the power supply part It is possible to provide an excellent two-wire wiring device in which the voltage supplied from the power supply to the operation unit can be established quickly, and an operable state can be obtained quickly after the power is turned on.

According to the third aspect of the invention, in addition to the effect of the second aspect of the invention, the output of the power source section is output by using the dummy load even if the current consumption of the operating section increases or decreases depending on the situation. Since the total current consumption of can be kept almost constant,
It is possible to provide stable power supply to the operation unit without changing the input impedance of the power supply unit, and to provide an excellent 2-wire wiring device that can compensate for stable operation.

[Brief description of drawings]

FIG. 1 is a block diagram showing a two-wire wiring device according to an embodiment of the present invention.

FIG. 2 is a timing chart for explaining the operation of the two-wire wiring device.

FIG. 3 is a block diagram showing a conventional two-wire wiring device.

FIG. 4 is a block diagram showing another conventional two-wire wiring device.

FIG. 5 is a block diagram showing still another conventional two-wire wiring device.

FIG. 6 is a block diagram showing still another conventional two-wire wiring device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Commercial power supply 2 Load 10 2-wire type wiring equipment 12 Power supply part 13 Auxiliary power supply circuit 14 Operation part 15 Load switching part 16 Drive circuit part 17 Phase detection part 18 Variable limit block 20 Dummy load Z ₁ Third impedance Z ₂ 2nd Impedance Z ₃ First impedance

─────────────────────────────────────────────────── ─── Continued Front Page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G05F 1/455 H02J 3/00

Claims (3)

(57) [Claims] 1. A load switching unit for controlling on / off of supply of commercial power to a load, and a phase detection unit for outputting a phase signal when a rectified voltage of a voltage across the load switching unit reaches a predetermined reference voltage. When a commercial power source is supplied to the load, the drive circuit section that turns on the load switching section on every half cycle of the commercial power source based on the phase signal output from the phase detection section, and the supply of the commercial power source to the load are required. An operating section that gives a denial instruction to the drive circuit section, a power supply section that supplies power to the operating section by using the voltage across the load switching section, and a substitute when the power supply section is connected to the output side of the power supply section and cannot supply power to the operating section. Is connected to the auxiliary power supply circuit that supplies power to the power supply unit, and is set to a first impedance value when the necessity instruction is required, which is connected to the preceding stage of the power supply unit.
And a variable restriction blocks a large second impedance value than the first impedance value when not, commercial
Is the phase angle of the commercial power supply 0 ° for each half cycle of the power supply?
From the phase detection unit to the output of the phase signal.
A two-wire wiring device characterized in that power is supplied to a power supply unit via an impedance value of 1 . 2. The impedance value of the variable limit block is set to a third impedance value smaller than the second impedance value during the charging period of the auxiliary power supply circuit when the commercial power supply is initially turned on. Item 2. A two-wire wiring device according to item 1. 3. A dummy load for adjusting the total output current of the power supply unit to be substantially constant even if the current consumption of the operation unit changes in accordance with a change in the state of the operation unit. The device according to claim 1 or 2, wherein the device is provided on the output side.
The described two-wire wiring device.