JP4552849B2 - 2-wire electronic switch - Google Patents

Description

  The present invention relates to a two-wire electronic switch for turning on and off the power supply from an AC power supply to a load, and it is necessary to secure an operating power supply by itself.

  Conventionally, as a switch to turn on / off the power supply from the AC power supply to the load, a non-contact switching element such as a thyristor or a triac is inserted into the power supply path from the AC power supply to the load as a load switching unit with the digitization of the wiring equipment. However, there is provided a type (first conventional switch) that electrically opens and closes (turns on and off) the contactless switching element using an electronic circuit. The first conventional switch needs to secure its own operating power supply (circuit power supply) because the electronic circuit drives the non-contact switching element when a person operates the operation unit (operation switch). For this reason, the first conventional switch has a configuration in which wiring is performed by three lines or four lines.

  However, from the viewpoint of reduced wiring, when a two-wire wiring is a general wiring device, the first conventional switch cannot individually draw in the power source wire when connected to the AC power source and the load by the two wires. As a result, securing a self-operating power supply became a problem.

  In order to solve the above problem, a two-wire electronic switch (2 wire electronic switch that enables two-wire wiring in a state in which a contactless switching element is used as a load switching unit while being connected in series with an AC power source and a load. A second conventional switch) has been proposed. A configuration almost similar to that of the second conventional switch is disclosed in Patent Document 1.

  The operation of the second conventional switch will be described with reference to FIG. FIG. 4 is a circuit diagram of a second conventional switch. In the second conventional switch 9, a triac 90 as a load switching unit is connected in series with the AC power source AC and the load L. First, when the control signal from the control output terminal 910 of the control unit 91 becomes low level, the third power supply unit 92 is turned off. At this time, the second power supply unit 93 supplies power to the first power supply unit 94. In this state, the gate current (drive signal) of a magnitude necessary to turn on the triac 90 does not flow through the gate (drive signal input terminal) of the triac 90, so the triac 90 is turned off (opened). The power supply from the AC power supply AC to the load L is cut off.

  On the other hand, when the control signal from the control output terminal 910 of the control unit 91 becomes a high level, the third power supply unit 92 is turned on. As a result, the third power supply unit 92 supplies power to the first power supply unit 94. At this time, when the charging of the first power supply unit 94 is completed, a current flows from the charging completion detection unit 920 to the auxiliary opening / closing unit 95, and the auxiliary opening / closing unit 95 is turned on (closed). When the auxiliary opening / closing unit 95 is turned on, a current having a magnitude necessary for turning on the triac 90 flows to the triac drive unit 96, and a gate current flows from the triac drive unit 96 to the triac 90. Thus, the triac 90 is turned on (closed), and power is supplied from the AC power supply AC to the load L.

In addition, a two-wire electronic switch (third conventional switch) including a function unit (additional function unit) having, for example, a notification function and a sensor function has been proposed as the second conventional switch. In a state in which the third conventional switch is connected to the AC power supply, the functional unit is always operating based on the power converted from the AC power from the AC power supply.
JP 2001-227804 A (pages 2 to 5 and FIG. 7)

  However, in the third conventional switch, when the power consumption of the functional unit increases, the current flowing through the functional unit increases, so that even if the power supply from the AC power supply to the load is stopped, There is a problem in that it does not operate or the load is not smoothly switched from the on state to the off state.

  The present invention has been made in view of the above points, and the purpose of the present invention is to reduce the power consumption by stopping the operation of the functional unit as necessary, thereby reducing the influence on the load. It is an object of the present invention to provide a two-wire electronic switch that can be used.

The invention according to claim 1 is a two-wire electronic switch that is connected to an AC power source and a load by two wires and secures its own operating power source based on the AC power from the AC power source. A load opening / closing unit that is inserted into a power supply path to the load and that switches electrical opening and closing between both ends, and operates with electric power based on the AC power, and switches the electrical opening and closing of the load opening and closing unit from the AC power source A control unit that outputs a control signal for controlling power supply to the load; and an additional function unit that operates with power based on the AC power, wherein the load is a lighting fixture, and the control unit includes the additional unit. The power supply to the function unit is controlled , and the power supply to the additional function unit is stopped for a predetermined period immediately after starting to turn on the operation power of the own unit from the AC power source .

  In this configuration, the power supply to the additional function unit can be controlled by the control unit, so that the operation of the additional function unit can be stopped as necessary to reduce power consumption and reduce the impact on the load. can do. Thereby, it can be used by connecting to various loads.

In this configuration, it is possible to stop the operation of the additional function unit by the control unit in the above period, it is possible to reduce the flash lighting fixtures.

According to a second aspect of the present invention, in the first aspect of the invention, the load is a lighting fixture, and the control is performed for a predetermined period immediately after the power supply from the AC power source to the load is stopped. The unit stops power supply to the additional function unit. In this configuration, since the operation of the additional function unit can be stopped by the control unit during the above period, it is possible to prevent a decrease in the interlocking function with the two-wire electronic switch in the lighting fixture and to reduce flicker. Can do.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the first power supply unit serving as an operation power supply for the control unit and the additional function unit, and the load opening / closing unit are in an open state. Based on the control signal, a second power supply unit that supplies power converted from the AC power to the first power supply unit when the power supply from the AC power supply to the load is stopped A third power supply unit that supplies power converted from the AC power to the first power supply unit, and the drive unit is electrically connected in series, and the first power supply is connected from the third power supply unit. When the input voltage of the first power supply unit becomes higher than a predetermined voltage value when power is supplied to the unit, the electrical switching is switched to the load switching unit by being closed. And an auxiliary opening / closing part. In this configuration, the first power supply unit, the second power supply unit, the third power supply unit, and the auxiliary switching unit can reliably supply power to the control unit, and the load switching unit can be electrically opened and closed. You can switch to

  According to the present invention, if necessary, the operation of the additional function unit can be stopped to reduce power consumption, and the influence on the load can be reduced.

( Basic form )
A basic form will be described with reference to FIG. FIG. 1 is a circuit diagram of a two- wire electronic switch A.

First, the basic configuration of the two-wire electronic switch A will be described . The two- wire electronic switch A secures its own operating power source based on AC power from the AC power source AC. As shown in FIG. 1, the load opening / closing unit 1, the rectifying unit 2, and the control unit 3 A first power supply unit 4, a second power supply unit 5, a third power supply unit 6, an auxiliary opening / closing unit 7, and a function unit (additional function unit) 8, and an AC power supply AC and a load L Connected in series with two wires. The AC power supply AC is, for example, a commercial power supply of 100V. The load L is, for example, a lighting device including a fluorescent lamp or an incandescent bulb, a ventilation fan, or the like.

The load opening / closing unit 1 includes a triac 10 and a triac drive unit 11. The triac 10 is formed of, for example, a semiconductor such as silicon, and switches electrical opening and closing between the two terminals 100 and 101 according to a gate current (drive signal). The TRIAC 10 is connected in series with an AC power source AC and a load L via terminals 12 and 13 and a filter inductor 14. The triac 10 and the inductor 14 are connected in parallel with the surge absorbing element 15 and the filter capacitor 16, respectively. On the other hand, the triac drive unit 11 includes a resistor 110 and a capacitor 111 connected in parallel, and is connected to the gate (drive signal input terminal) of the triac 10 at one end and to the terminal 101 of the triac 10 at the other end. ing. Further, the triac drive unit 11 is connected in series with a thyristor 70 of the auxiliary opening / closing unit 7 described later via the rectifying unit 2. When the thyristor 70 is turned on (closed), the current flowing through the triac drive unit 11 increases, and a gate current having a magnitude necessary for turning on the triac 10 is caused to flow to the gate of the triac 10 . When bets Raiakku 10 is turned on (closed) state, the AC power source AC, the triac 10, inductor 14, and conduction circuit of the load L, the load L is operated is supplied with electric power to the load L. On the other hand, when the triac 10 is turned off (opened), power is not supplied to the load L, and the operation of the load L is stopped.

  The rectification unit 2 is a diode bridge composed of four diodes, and is connected to the AC power supply AC and the load L via terminals 12 and 13 at the input end, and the second power supply unit 5 and the third power supply unit at the output end. 6 and the auxiliary opening / closing part 7. The rectifying unit 2 performs full-wave rectification on the AC power from the AC power supply AC, and outputs the full-wave rectified power to the second power supply unit 5, the third power supply unit 6, and the auxiliary opening / closing unit 7.

  The control unit 3 is a microcomputer that outputs a control signal for switching electrical opening and closing of the triac 10 from the control output terminal 30 to the third power supply unit 6 by, for example, a human operation. The control unit 3 operates with electric power from the first power supply unit 4. In addition, the control unit 3 is provided with an operation unit (operation switch) (not shown) such as a tact switch, which is operated by a person, and the control signal is output every time the operation unit is operated. 3 to the power supply unit 6. The control signal is a binary signal having a high level and a low level, and the control unit 3 outputs a high-level control signal when the triac 10 is turned on, and when the triac 10 is turned off. Outputs a low level control signal. Thereby, the control unit 3 controls power supply from the AC power supply AC to the load L.

  In addition, the control unit 3 supplies power to the function unit 8 and, when the function unit 8 is a notification unit, for example, provides a notification signal that notifies that the two-wire electronic switch is operating. Output to. On the other hand, when the functional unit 8 is a sensor means, a sensor signal based on the state of the sensor is input from the functional unit 8, and the control signal is output to the third power source unit 6 based on the sensor signal.

  The first power supply unit 4 is an operation power supply for the control unit 3 and the function unit 8, and sequentially connects a buffer capacitor 40, a three-terminal regulator 41, a capacitor 42, and a capacitor 43 from the input end side. The input terminal is connected to the second power supply unit 5 and the third power supply unit 6, and the output terminal is connected to the input terminal of the control unit 3. The buffer capacitor 40 is charged with power from the second power supply unit 5 and the third power supply unit 6 and smoothed by removing ripple components. The three-terminal regulator 41 stabilizes the direct-current voltage of the buffer capacitor 40 to, for example, 3V. From the above, the first power supply unit 4 supplies stable power to the control unit 3.

  The second power supply unit 5 includes, in order from the input end side, a current-limiting resistor 50, an NPN transistor 51, and a resistor 52 connected in series, and is connected to the output end of the rectifying unit 2 at the input end. In addition, the first power supply unit 4 is connected on the output end side. The second power supply unit 5 includes a bias resistor 53 connected between the base and collector of the transistor 51, and a Zener diode 54 whose cathode is connected to the base of the transistor 51. The base of the transistor 51 is grounded via a Zener diode 54. The impedance conversion of the second power supply unit 5 is performed according to the on state and the off state of the transistor 51. The second power supply unit 5 supplies AC power from the AC power supply AC via the rectifying unit 2 when the triac 10 is turned off and power supply from the AC power supply AC to the load L is stopped. The power is received as full-wave rectified power, is converted into power whose size is regulated by the Zener diode 54, and the converted power is supplied to the first power supply unit 4. At this time, the load current in the two-wire electronic switch A is divided into a current flowing through the first power supply unit 4 and a current flowing through the Zener diode 54, both of which are finally connected to the rectifying unit via the ground. 2 and returns to the AC power source AC via the load L. The load current at this time is large enough to prevent the load L from malfunctioning. Further, the current consumption of the control unit 3 is kept low, and the impedance of the second power supply unit 5 is kept high.

  The third power supply unit 6 includes, in order from the input end side, a PNP transistor 60 and a diode 61 connected in series. The third power supply unit 6 is connected to the output end of the rectifying unit 2 at the input end and the first at the output end. Is connected to the power supply unit 4 of That is, the third power supply unit 6 is connected in parallel with the second power supply unit 5. The third power supply unit 6 includes a resistor 62 and a capacitor 63 connected between the base and emitter of the transistor 60, and a resistor 64 and an NPN transistor 65 connected to the base of the transistor 60. Further, the third power supply unit 6 includes a resistor 66 connected between the base and emitter of the transistor 65. The transistor 65 has an emitter grounded and a base connected to the control output terminal 30 of the control unit 3. The transistor 65 controls the on / off state of the transistor 60. The third power source unit 6 receives AC power from the AC power source AC as full-wave rectified power via the rectifying unit 2 based on a control signal from the control unit 3, and receives the power from the first power source AC. The power is supplied to the power supply unit 4. A specific procedure will be described. When a high-level control signal is received from the control unit 3, the transistor 65 is turned on. Accordingly, the transistor 60 is turned on. At this time, the impedance of the two-wire electronic switch A decreases. Thereafter, the third power supply unit 6 supplies power to the first power supply unit 4. In contrast, when a low level control signal is received from the control unit 3, the transistor 65 is turned off and the transistor 60 is also turned off. As a result, the third power supply unit 6 stops supplying power to the first power supply unit 4.

  The auxiliary opening / closing unit 7 includes a thyristor 70 and a thyristor driving unit 71. The thyristor 70 is connected to the output terminal of the rectifying unit 2 and is also connected to the input terminals of the second power supply unit 5 and the third power supply unit 6. On the other hand, the thyristor driving unit 71 includes a resistor 710 and a capacitor 711 connected in parallel, one end connected to the gate of the thyristor 70 and the Zener diode 72, and the other end connected to the cathode of the thyristor 70. The zener diode 72 is connected to the DC voltage of the buffer capacitor 40 of the first power supply unit 4 when the power is supplied from the third power supply unit 6 to the first power supply unit 4. When the input voltage becomes higher and the cathode potential becomes higher than the zener voltage, the charging completion detection unit detects that the charging of the first power supply unit 4 is completed by flowing a reverse current to the thyristor driving unit 71. . When a reverse current flows from the Zener diode 72, the thyristor driving unit 71 causes a gate current of a magnitude necessary to turn on the thyristor 70 to flow through the thyristor 70 for a certain period. As a result, the load current flowing from the rectifying unit 2 to the third power supply unit 6 flows from the rectifying unit 2 to the thyristor 70, and the auxiliary opening / closing unit 7 is necessary to turn on the triac 10 with respect to the triac drive unit 11. A large amount of gate current is caused to flow through the triac 10 to switch the triac 10 to the on state.

  The function unit 8 has, for example, a notification function and a sensor function, and operates by supplying a part of the operating power of the control unit 3 directly from the control unit 3. For example, there are an indicator lamp and a speaker having a notification function, and these notify the operation state of the two-wire electronic switch. Moreover, there exist a human sensor, a brightness sensor, etc. as what has a sensor function, for example. When the function unit 8 has a notification function, the function unit 8 notifies based on a notification signal from the control unit 3. On the other hand, when the functional unit 8 has a sensor function, the functional unit 8 outputs a sensor signal based on the state of the sensor to the control unit 3.

Next , the operation of the two- wire electronic switch A will be described. First, an operation in a state where the power supply from the AC power supply AC to the load L is not performed (off state) will be described. When the control signal of the control unit 3 becomes low level, the transistor 65 and the transistor 60 of the third power supply unit 6 are turned off. On the other hand, the second power supply unit 5 supplies power to the first power supply unit 4. As a result, the first power supply unit 4 serves as an operating power supply for the control unit 3. At this time, if the control unit 3 is set to supply power to the function unit 8, power is supplied from the control unit 3 to the function unit 8. On the other hand, if the control unit 3 is set so that the power supply to the function unit 8 is stopped, the power supply to the function unit 8 is not performed. Further, in this state, the gate current of the magnitude necessary to turn on the triac 10 does not flow through the gate of the triac 10, so the triac 10 is turned off, and the AC power source AC applies the load L to the load L. Not enough power to operate.

  Next, an operation in a state where the power supply from the AC power supply AC to the load L is performed (on state) will be described. When the control signal of the control unit 3 becomes high level, the transistor 65 and the transistor 60 are turned on, and the third power supply unit 6 supplies power to the first power supply unit 4. As a result, the first power supply unit 4 serves as an operating power supply for the control unit 3. At this time, if the control unit 3 is set to supply power to the function unit 8, power is supplied from the control unit 3 to the function unit 8. On the other hand, if the control unit 3 is set so that the power supply to the function unit 8 is stopped, the power supply to the function unit 8 is not performed. On the other hand, when the input voltage of the first power supply unit 4 increases and the cathode potential of the Zener diode 72 becomes higher than the Zener voltage, the Zener diode 72 causes a reverse current to flow to the thyristor driving unit 71. After that, the thyristor driving unit 71 passes a gate current of a magnitude necessary for turning on the thyristor 70 to the thyristor 70, and the thyristor 70 is turned on. As a result, the load current flowing from the rectifying unit 2 to the third power supply unit 6 flows from the rectifying unit 2 to the thyristor 70. After that, the triac drive unit 11 causes a gate current of a magnitude necessary to turn on the triac 10 to flow to the gate of the triac 10, and the triac 10 is turned on. As described above, power is supplied from the AC power supply AC to the load L.

  Here, when the triac 10 is turned on, a load current flows through the triac 10, but when the zero cross point is reached, the arc is turned off and turned off. When the triac 10 is turned off, a load current flows again from the rectifying unit 2 to the first power supply unit 4 via the third power supply unit 6, and an operating power supply for the two-wire electronic switch A is secured, and a thyristor 70 is provided. Then, an operation to turn on the triac 10 is performed. That is, the operation of securing the operating power supply is performed every half cycle of the AC power from the AC power supply AC.

As described above, according to the two-wire electronic switch A , since the power supply to the function unit 8 can be controlled by the control unit 3, the operation of the function unit 8 is stopped if necessary, and the function of the two-wire electronic switch is stopped. Power consumption can be reduced and the influence on the load L can be reduced. Thereby, it can be used by connecting to various loads L. In addition, the first power supply unit 4, the second power supply unit 5, and the third power supply unit 6 can reliably supply power based on the AC power from the AC power supply AC to the control unit 3. Further, the auxiliary opening / closing unit 7 can reliably switch the triac 10 of the load opening / closing unit 1 to the off state.

FIG. 2 is a main circuit diagram of the two- wire electronic switch B. 2a and 2b are connected to the first power supply unit 4 and the third power supply unit 6 in FIGS.

As shown in FIGS. 1 and 2, the two- wire electronic switch B includes a load switching unit 1, a rectifying unit 2, a first power supply unit 4, a second power supply unit 5, and a third power supply unit 6. When an auxiliary switching unit 7, and a function unit 8, it has like the 2-wire electronic switch a, there is a characteristic portion described below is not the two-wire electronic switch a.

As shown in FIG. 2, the two- wire electronic switch B includes a control unit 3 a and a power supply control IC 31. The control unit 3a has the same function as the control unit of the two-wire electronic switch A. The power supply control IC 31 is, for example, a regulator with enable, and is connected to the control unit 3a, the first power supply unit 4 (see FIG. 1), and the function unit 8.

As described above, even with the two-wire electronic switch B , the same effect as the two-wire electronic switch A can be obtained.

(Working-shaped state)
It will be described with reference to FIGS. 1 and 3 with the embodiment type state of the present invention. Figure 1 is a circuit diagram of a two-wire electronic switch of the present embodiment forms condition. Figure 3 is a diagram showing the operation timing of the two-wire electronic switch of the present embodiment forms condition.

2-wire electronic switch A of the present embodiment forms state, as shown in FIG. 1, the load switch unit 1, a rectifying unit 2, a first power supply unit 4, and the second power supply portion 5, the third a power supply unit 6, an auxiliary switching unit 7, and a function unit 8, it has like the 2-wire electronic switch a, there is a characteristic portion described below is not the two-wire electronic switch a.

First, Oite the present type condition, the load L is a luminaire including, for example fluorescent or incandescent.

The control unit 3 of the present embodiment forms condition is immediately after stopping the power supply for a predetermined period immediately after the operation power is started on of the AC power source AC from the two-wire electronic switch A, and from the AC power source AC to the lighting equipment The power supply to the functional unit 8 is stopped for a certain period. The control unit of the present embodiment forms condition, in other respects, is similar to the control unit of the two-wire electronic switch A.

Next, the operation of the two-wire electronic switch A of the present embodiment forms state will be described with reference to FIG. In FIG. 3, the power supply to the functional unit 8 is 100% in a steady state. First, the case where electric power is supplied from the AC power source AC to the two-wire electronic switch A will be described. When the power is turned on at time t1, charging of the first power supply unit 4 serving as the operation power supply for the control unit 3 starts. At this time, the power supply to the functional unit 8 remains stopped. At time t2, the charging of the first power supply unit 4 is completed and the control unit 3 starts up. Even at time t2, the power supply to the functional unit 8 remains stopped. Thereafter, the control unit 3 starts to supply power to the functional unit 8 at time t3. From the above, during the period from time t1 to time t3 when power is supplied from the AC power source AC to the two-wire electronic switch A, the operation of the functional unit 8 is stopped by the control unit 3, and the function of the two-wire electronic switch A is Since the power consumption for starting up can be dispersed over time, it is possible to reduce the flashing of the lighting fixture from time t1 to time t3 in the extinguished state.

  Next, the case where the power supply from the AC power supply AC to the lighting fixture is stopped and the lighting fixture is turned off will be described. After the lighting fixture is turned on at time t4, the control signal of the control unit 3 is set to a low level at time t5 to stop the power supply to the lighting fixture. Moreover, the control part 3 stops the electric power supply to the function part 8 for the fixed time to time t6. At this time, since the two-wire electronic switch A has a high impedance, the load current of the two-wire electronic switch A that becomes a leakage current for the lighting fixture is reduced. From the above, the applied voltage of the luminaire becomes low, and it can be easily recognized that the luminaire has turned off even if it is switched from the lit state to the unlit state. It can be performed smoothly, and the occurrence of flicker due to the energy remaining in the lighting fixture is reduced, or the reduction in the interlocking function with the two-wire electronic switch A is reduced.

As described above, according to the present embodiment form condition, and stops the power supply between the AC power source AC from the two-wire electronic switch A operation power poured start the time t1 to time t3, and from the AC power source AC to the lighting equipment Since the operation of the functional unit 8 can be stopped by the control unit 3 from the time t5 to the time t6, the flashing of the lighting fixture can be reduced from the time t1 to the time t3. Further, during the period from time t5 to time t6, it is possible to prevent a decrease in the interlocking function with the two-wire electronic switch A in the lighting fixture, and it is possible to reduce flicker.

( Reference example )
A reference example will be described.

Similar to the two- wire electronic switch A (see FIG. 1) , the two- wire electronic switch of the reference example includes a rectifying unit 2, a control unit 3, a first power supply unit 4, and a second power supply unit 5. The third power supply unit 6, the auxiliary opening / closing unit 7, and the function unit 8 are provided. However , the two- wire electronic switch A has the following characteristic portions.

In the load switching unit of the reference example , the triac has temperature dependency on the amplitude values of the gate current and the gate voltage when the electrical switching between the two terminals is switched. Specifically, the gate current decreases at a high temperature and increases at a low temperature. Further, the gate voltage becomes low when the temperature is high and becomes high when the temperature is low. From the above, the sensitivity of the triac increases as the temperature increases. That is, it turns on with a small gate current or a low gate voltage. On the other hand, when the temperature is lowered, the sensitivity is lowered, and a large gate current and a high gate voltage are required for turning on.

In addition, the load opening / closing unit of the reference example includes a triac driving unit including a temperature-sensitive resistor instead of the triac driving unit of the two-wire electronic switch A. The temperature-sensitive resistance is, for example, an NTC thermistor, and the temperature rise of the triac is monitored, and the resistance value changes according to the temperature of the triac. Specifically, the temperature-sensitive resistance decreases as the temperature of the triac rises, and increases the flowing current. On the other hand, when the temperature of the triac decreases, the resistance value increases and the flowing current is reduced. Such a temperature-sensitive resistor controls the gate current so that the turn-on timing of the triac is constant with respect to the temperature change of the triac. This prevents the load current in the two-wire electronic switch of the reference example from being too small when the triac is turned on and turned on even if the triac becomes highly sensitive due to temperature rise. The load opening / closing part of the reference example is the same as the load opening / closing part 1 (see FIG. 1) of the two-wire electronic switch A except for the points described above.

Next, the operation of the two-wire electronic switch of the reference example will be described. The operation in the state where the power supply from the AC power supply AC to the load L is not performed (off state) is the same as that of the two-wire electronic switch A. Next, an operation in a state where the power supply from the AC power supply AC to the load L is performed (on state) will be described. When the control signal of the control unit 3 becomes high level, like the two-wire electronic switch A , when the cathode potential of the Zener diode 72 becomes higher than the Zener voltage, the Zener diode 72 causes a reverse current to flow to the thyristor driving unit 71. Thereafter, the thyristor driving unit 71 passes a gate current to the thyristor 70, and the thyristor 70 is turned on. Then, the resistance value corresponding to the temperature of the triac is set for the temperature-sensitive resistance so that the turn-on timing of the triac is constant. Due to the temperature sensitive resistance, a gate current flows to the gate of the triac, and the triac is turned on.

As described above, according to the reference example , the triac has temperature dependence, and even when the temperature increase of the triac becomes large, the switching timing of the electrical opening and closing of the triac is constant with respect to the temperature change of the triac. Since the resistance value of the temperature sensitive resistor can be changed so that the operation power of the two-wire electronic switch is secured, it can be reduced that the triac is turned on and turned on. A stable power supply can be secured. In addition, by using the temperature sensitive resistor, the switching timing of the electrical opening / closing of the triac can be made constant with respect to the temperature at a small size and at a low cost.

In addition, as a modification of the embodiment , the basic form, or the reference example , the load opening / closing unit may include a thyristor instead of the triac. Even with such a configuration, the same effects as those of the embodiment , the basic mode, or the reference example can be obtained.

As another modification of the embodiment , basic form, or reference example , when the triac is turned on and when the triac is turned off, the control unit sends a pulsed control signal to the third power supply unit. The configuration may be such that the third power supply unit supplies power to the first power supply unit based on the control signal. Even with such a configuration, the same effects as those of the embodiment , the basic mode, or the reference example can be obtained.

1 is a circuit diagram of a two-wire electronic switch according to an embodiment and a basic form of the present invention. It is a principal part circuit diagram of the other 2-wire type electronic switch of the basic form by this invention. It shows an operation timing of the two-wire electronic switch exemplary type status in accordance with the present invention. It is a circuit diagram of the conventional 2-wire type electronic switch.

DESCRIPTION OF SYMBOLS 1 Load switching part 10 Triac 3 Control part 4 1st power supply part 6 3rd power supply part 8 Function part

Claims (3)

A two-wire electronic switch that is connected to an AC power source and a load with two wires and secures its own operating power source based on the AC power from the AC power source,
A load switching unit that is inserted into a power supply path from the AC power source to the load and switches electrical switching between both ends;
A controller that operates with power based on the AC power, and outputs a control signal that controls power supply from the AC power supply to the load by switching the electrical switching of the load switching unit;
An additional function unit that operates with power based on the AC power,
The load is a lighting fixture;
Wherein the control unit controls the power supply to the additional function unit, a predetermined period immediately after the start-up operating power of the self from the AC power source, stopping the power supply to the additional function unit 2-wire electronic switch. The load is a lighting fixture;
The two-wire according to claim 1 , wherein the control unit stops power supply to the additional function unit for a predetermined period immediately after the power supply from the AC power supply to the load is stopped. Electronic switch. A first power supply unit serving as an operation power supply for the control unit and the additional function unit;
A second power source configured to supply power converted from the AC power to the first power source when the load switching unit is in an open state and the power supply from the AC power source to the load is stopped. A power supply,
A third power supply unit that supplies power converted from the AC power to the first power supply unit based on the control signal;
The input voltage of the first power supply unit is a predetermined voltage when the first power supply unit is electrically connected in series with the drive unit and power is supplied from the third power supply unit to the first power supply unit. An auxiliary opening / closing part that switches the electrical opening / closing to the load opening / closing part by being in a closed state when higher than a value;
2-wire electronic switch according to claim 1, wherein further comprising a.

Images