JP7390589B2 - Switching control device and switching control system - Google Patents

Description

The present invention generally relates to a switching control device and a switching control system, and more particularly relates to a switching control device and a switching control system used with a circuit device including a switch section electrically connected between an AC power source and a load. .

BACKGROUND ART Electronic switch devices (automatic switches with heat ray sensors) that turn on/off a load by detecting heat rays emitted from a human body are known (for example, see Patent Document 1). The electronic switch device described in Patent Document 1 includes a load control circuit having, between connection terminals, a primary winding of a current transformer, a full-wave rectifier, and a bidirectional thyristor that controls on/off the power supply to the load. are connected in series.

Further, in the electronic switch device described in Patent Document 1, a power supply circuit is connected between the DC output terminals of the full-wave rectifier. The power supply circuit supplies power to a constant voltage circuit that generates control power (operating power) for a control IC (Integrated Circuit) when the load is not energized. Further, when the load is energized, the auxiliary power supply circuit supplies power to the constant voltage circuit by the current flowing through the secondary winding of the current transformer.

Japanese Patent Application Publication No. 2000-131456

The electronic switch device described in Patent Document 1 requires a current transformer to ensure a control power source when the load is energized, so there is a problem in that it is difficult to miniaturize the device.

The present invention has been made in view of the above reasons, and an object of the present invention is to provide a switching control device and a switching control system that can be miniaturized.

The switching control device of the present invention is used together with a circuit device. The circuit device includes a switch section, a power supply section, a switch control section, two or more power supply paths, a switching section, and a voltage monitoring section. The switch section is electrically connected between an AC power source and a load, and switches conduction/non-conduction between the AC power source and the load. The power supply unit is electrically connected between both ends of the switch unit, and generates a control power supply using power supplied from the AC power supply. The switch control section operates upon receiving the control power from the power supply section, and controls the switch section. The two or more power supply paths are electrically connected between both ends of the switch section, and serve as paths for the supplied power between the switch section and the power supply section. The two or more power feeding paths have different impedances. The switching unit switches a power feeding path used as a path for the supplied power to any one of the two or more power feeding paths. The voltage monitoring unit monitors a voltage across the switch, which is a voltage across the switch unit. The switching control device includes a switching control section. The switching control unit acquires a monitoring signal representing a comparison result between the voltage between the switches and a reference value from the voltage monitoring unit, and determines whether the voltage between the switches is equal to or higher than the reference value or the reference value based on the monitoring signal. Find the pulse width, which is the length of time less than or equal to The switching control section controls the switching section based on a comparison result between the pulse width and a threshold value .

The switching control system of the present invention includes a plurality of the switching control devices, and the plurality of switching control devices are used together with the plurality of circuit devices. The plurality of switch sections included in the plurality of circuit devices are electrically connected in parallel between the AC power source and the load. When the switch portion of any one of the plurality of circuit devices is in a conductive state , the switching control corresponding to another circuit device in which the switch portion is in a non-conductive state among the plurality of circuit devices. In the device , the switching control section controls the switching section so that a power feeding path used for the path of the supplied power is switched.

The present invention has the advantage that miniaturization is possible.

FIG. 1 is a schematic circuit diagram showing the configuration of an electronic switch device according to Embodiment 1 of the present invention. FIG. 2 is a schematic circuit diagram showing the configuration of an electronic switch system according to Embodiment 1 of the present invention. FIG. 3 is a timing chart showing the first operation of the above electronic switch system. FIG. 4 is a timing chart showing a second operation of the above electronic switch system. FIG. 5 is a schematic circuit diagram showing the configuration of an electronic switch system according to Embodiment 2 of the present invention.

(Embodiment 1)
(1) Overview As shown in FIG. 2, the electronic switch devices 1A and 1B according to the first embodiment are electrically connected between an AC power source 11 and a load 12, and are in an energized state from the AC power source 11 to the load 12. It is a wiring device that switches the The electronic switch devices 1A and 1B are attached to, for example, a wall of a house. The AC power supply 11 is, for example, a single-phase 100 [V], 60 [Hz] commercial power supply. The load 12 is, for example, a lighting device including a light source having an LED (Light Emitting Diode) and a lighting circuit that lights the light source. In this load 12, the light source lights up when power is supplied from the AC power source 11.

In the example shown in FIG. 2, an electronic switch system 10 is configured by two electronic switch devices 1A and 1B. That is, the electronic switch system 10 includes a plurality of (here, two) electronic switch devices 1A and 1B. The two electronic switch devices 1A and 1B have a common configuration. Hereinafter, unless the two electronic switch devices 1A, 1B are particularly distinguished, each of the two electronic switch devices 1A, 1B will be referred to as "electronic switch device 1."

The electronic switch device 1 includes a switch section Q1 made of a semiconductor switch such as a bidirectional thyristor and a transistor, for example. The electronic switch device 1 electronically switches conduction/non-conduction between the AC power source 11 and the load 12 by electronically controlling the switch unit Q1.

In this embodiment, the electronic switch device 1 is a so-called three-way switch to which three wires can be connected. The electronic switch device 1 includes three connection terminals 101, 102, and 103. Therefore, in the electronic switch system 10 that combines the two electronic switch devices 1A and 1B, it is possible to switch the energization state to the load 12 at two locations, for example, the upper floor and the lower floor of the stairs in a building. be.

In the example of FIG. 2, the connection terminal 101 of the electronic switch device 1A (hereinafter also referred to as “first electronic switch device 1A”) is connected to the load 12. A connection terminal 101 of the electronic switch device 1B (hereinafter also referred to as “second electronic switch device 1B”) is connected to the AC power source 11. Furthermore, the connection terminal 102 of the electronic switch device 1A is connected to the connection terminal 103 of the electronic switch device 1B. The connection terminal 103 of the electronic switch device 1A is connected to the connection terminal 102 of the electronic switch device 1B. In each electronic switch device 1, the connection terminal 101 and the connection terminal 102 are connected inside the electronic switch device 1.

Further, in each electronic switch device 1, the switch section Q1 is connected between the connection terminal 101 and the connection terminal 103. Therefore, in each electronic switch device 1, when the switch portion Q1 is in a conductive state (turned on), the connection terminals 101 and 102 are electrically connected to the connection terminal 103 via the switch portion Q1. Further, in each electronic switch device 1, when the switch portion Q1 is in a non-conductive (off) state, there is no conduction between the connection terminals 101 and 102 and the connection terminal 103.

That is, the plurality of switch sections Q1 included in the plurality of (here, two) electronic switch devices 1A and 1B are electrically connected in parallel between the AC power supply 11 and the load 12. Therefore, in the electronic switch system 10, if the switch unit Q1 of the two electronic switch devices 1A, 1B is conductive, the AC power supply 11 and the load 12 are conductive, and the two electronic switch devices 1A, 1B are conductive. Power is supplied from the AC power supply 11 to the load 12 via 1B. Therefore, in the electronic switch system 10, it is possible to switch the energization state to the load 12 in both the switch section Q1 of the electronic switch device 1A and the switch section Q1 of the electronic switch device 1B.

(2) Details (2.1) Overall configuration of electronic switch device The configuration of the electronic switch device of this embodiment will be described below with reference to FIGS. 1 and 2.

As shown in FIG. 2, the electronic switch device 1 includes a rectifier 2 and a circuit section 3 in addition to a switch section Q1 and three connection terminals 101, 102, 103. These switch unit Q1, three connection terminals 101, 102, 103, rectifier 2, and circuit unit 3 are housed in one housing, and when the housing is fixed to a wall etc., electronic switch device 1 can be attached to a wall, etc.

The switch unit Q1 is electrically connected between the AC power source 11 and the load 12, and switches conduction/non-conduction between the AC power source 11 and the load 12. In this embodiment, the switch section Q1 is configured with a three-terminal bidirectional thyristor (TRIAC). The switch section Q1 is electrically connected between the connection terminal 101 and the connection terminal 103, and switches between passing and blocking of bidirectional current between the connection terminal 101 and the connection terminal 103. A control terminal (gate terminal of the bidirectional thyristor) of the switch section Q1 is electrically connected to the circuit section 3. Thereby, the switch section Q1 is controlled by a switch control section 51, which will be described later. In FIGS. 1, 2, etc., the switch portion Q1 is indicated by the same circuit symbol as a mechanical switch having contacts.

Each of the three connection terminals 101, 102, and 103 is a component to which wiring is electrically and mechanically connected. The switch section Q1 is connected between the first connection terminal 101 and the third connection terminal 103 as described above. The second connection terminal 102 is a sending terminal for the first connection terminal 101 and is electrically connected to the first connection terminal 101 .

Rectifier 2 consists of a diode bridge. The rectifier 2 performs full-wave rectification on the voltage applied across the switch section Q1 (hereinafter also referred to as "switch voltage Vsw"), and outputs it to the circuit section 3. Therefore, the circuit section 3 is connected between the DC output terminals of the rectifier 2. The circuit section 3 uses the full-wave rectified power input from the rectifier 2 to generate a "control power source" necessary for controlling the switch section Q1, driving the sensor section 31, etc., for example.

In the following, it is assumed that both switch sections Q1 of the two electronic switch devices 1A and 1B are in a non-conductive state, and that an alternating current voltage Vac is applied to the switch section Q1 from the alternating current power supply 11. That is, if both of the two electronic switch devices 1A and 1B are in the OFF state, the inter-switch voltage Vsw becomes equal to the AC voltage Vac from the AC power supply 11. Further, the polarity of the AC voltage Vac is set to be positive in the direction of the arrow in FIG.

Next, details of the circuit section 3 will be explained with reference to FIG. The circuit section 3 includes a power generation block 4, a control section 5, a sensor section 31, and a voltage monitoring section 32.

The power generation block 4 includes two power supply paths (a first power supply path 41 and a second power supply path 42), a power supply section 43, and a switching section 44. The power supply unit 43 is electrically connected between both ends of the switch unit Q1, and is configured to generate control power using the power supplied from the AC power supply 11. The first power supply path 41 and the second power supply path 42 are electrically connected in parallel between the switch section Q1 and the power supply section 43. Therefore, two paths are formed as paths for supplying power from the AC power source 11 to the power supply section 43: one including the first power feed path 41 and the other including the second power feed path 42. The switching section 44 is electrically connected between the switch section Q1 and two power feeding paths (the first power feeding path 41 and the second power feeding path). The switching unit 44 is configured to switch the power feeding path used for the path of the power supplied from the AC power source 11 to the power source unit 43 between the first power feeding path 41 and the second power feeding path 42 . Note that "switching the power supply path" means electrically switching the power supply path used for the power supply route between the first power supply path 41 and the second power supply path 42; The present invention is not limited to physically switching the power supply path 42.

The first power supply path 41 is composed of a low impedance element with relatively low impedance. The second power supply path 42 is configured to include a high impedance element with relatively high impedance. An example of a low impedance element is a load switch including, for example, a PNP type bipolar transistor. The load switch is electrically connected in series between the switching unit 44 and the power supply unit 43, and when turned on, the impedance of the first power supply path 41 becomes low. Note that the load switch is not limited to a configuration including a bipolar transistor, but may include, for example, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor). An example of a high impedance element is a dropper circuit that steps down the input voltage (switch voltage Vsw) and outputs it to the power supply section 43.

The switching unit 44 includes, for example, a semiconductor switch such as a transistor, and is electrically connected between the power input terminal 401 and the first power supply path 41. The power input terminal 401 is electrically connected to the positive DC output terminal of the rectifier 2 . When the switching section 44 is turned on, the first power feeding path 41 is used as the path for supplying power to the power supply section 43, and when the switching section 44 is turned off, the second power feeding path is used as the path for supplying power to the power supply section 43. path 42 is used. For example, if the low impedance element is a load switch including a bipolar transistor, when the switching section 44 is turned on, a base current flows through the bipolar transistor of the load switch. The switching unit 44 is controlled by a switching control unit 52, which will be described later. Based on the switching control signal output from the switching control unit 52, the switching unit 44 switches the power feeding path used for the path of the power supplied to the power supply unit 43 between the first power feeding path 41 and the second power feeding path 42. Switch. In FIG. 1, the switching unit 44 is represented by the same circuit symbol as a mechanical switch having contacts.

The power supply unit 43 includes a capacitor C1 and a regulator 45. The capacitor C1 is electrically connected between the output terminals of the first power supply path 41 and the second power supply path 42 and the ground (reference potential point). Regulator 45 is a three-terminal regulator (series regulator). The input terminal of the regulator 45 is electrically connected to the high potential side terminal of the capacitor C1, that is, to the output terminals of the first power supply path 41 and the second power supply path 42, respectively. The regulator 45 converts the voltage across the capacitor C1 into a predetermined voltage and outputs the voltage. The output terminal of the regulator 45 corresponds to the output terminal of the power supply section 43 and is electrically connected to the power supply output terminal 402. Power output terminal 402 is electrically connected to control section 5 .

That is, between the DC output terminals of the rectifier 2, the parallel circuit of the first power feed path 41 and the second power feed path 42 and the power supply section 43 are electrically connected in series. A full-wave rectified inter-switch voltage Vsw, that is, a pulsating voltage output from the rectifier 2 is applied between the power supply input terminal 401 and the ground (reference potential point). This charges the capacitor C1. Power supplied to the power supply unit 43 is supplied to the power supply unit 43 via either the first power supply path 41 or the second power supply path 42 depending on the connection destination of the power input terminal 401 by the switching unit 44. It turns out.

A "terminal" such as a "power input terminal" in this embodiment does not need to have a physical component (terminal) for connecting an electric wire etc., for example, a lead of an electronic component or a terminal included in a circuit board. It may be part of a conductor.

The control unit 5 operates upon receiving control power from the power generation block 4 . The control section 5 includes a switch control section 51 that controls the switch section Q1, and a switching control section 52 that controls the switching section 44.

The switch control section 51 outputs a switch control signal to the control terminal (gate terminal of the bidirectional thyristor) of the switch section Q1 based on the detection result of the sensor section 31. Thereby, the switch control unit 51 controls the switch unit Q1 to switch the switch unit Q1 between conduction and non-conduction. Furthermore, when the switch unit Q1 is turned on, the control unit 5 determines the timing of outputting the switch control signal based on the monitoring signal output from the voltage monitoring unit 32. The control section 5 includes a drive circuit for driving the switch section Q1, and the control section 5 directly controls the switch section Q1.

The switching control section 52 outputs a switching control signal to the switching section 44 based on the monitoring signal output from the voltage monitoring section 32. Thereby, the switching control unit 52 controls the switching unit 44 so that the power feeding path used for the path of the power supplied to the power supply unit 43 is switched between the first power feeding path and the second power feeding path.

The control unit 5 includes, for example, a microcomputer as a main component. The microcomputer realizes the function of the control unit 5 by having a CPU (Central Processing Unit) execute a program recorded in the memory of the microcomputer. The program may be recorded in advance in the memory of the microcomputer, or may be provided recorded on a recording medium such as a memory card, or may be provided through a telecommunications line. In other words, the above program is a program for causing the microcomputer to function as the control unit 5.

The sensor unit 31 detects whether a person is present in the detection area. The sensor unit 31 includes, for example, a pyroelectric element, and determines whether a person is present in the detection area by detecting infrared rays emitted from a human body. When the sensor section 31 detects the presence of a person in the detection area, it outputs an on-control instruction to turn on the switch section Q1 to the switch control section 51 of the control section 5.

The voltage monitoring unit 32 is configured to monitor (detect) the magnitude of the inter-switch voltage Vsw, which is the voltage across the switch unit Q1. In this embodiment, the voltage monitoring unit 32 is electrically connected between the DC output terminals of the rectifier 2, and monitors the magnitude of the inter-switch voltage Vsw after full-wave rectification. The voltage monitoring unit 32 compares the magnitude (absolute value) of the inter-switch voltage Vsw with a reference value, and outputs a monitoring signal representing the comparison result to the control unit 5. The reference value is a value (absolute value) set around 0 [V], and is, for example, about several [V]. The voltage monitoring unit 32 also functions as a zero-crossing detection unit that detects the zero-crossing point [0V] of the AC voltage Vac, but the detection point of the zero-crossing is slightly delayed from the zero-crossing point [0V] of the AC voltage Vac.

Upon receiving the ON control instruction from the sensor section 31, the switch control section 51 outputs a switch control signal to the switch section Q1 based on the monitoring signal from the voltage monitoring section 32. Specifically, the switch control unit 51 makes the switch unit Q1 conductive when the magnitude (absolute value) of the inter-switch voltage Vsw exceeds a reference value based on the monitoring signal from the voltage monitoring unit 32. . As described above, the switch unit Q1 is composed of a bidirectional thyristor, so it becomes conductive when a switch control signal is input, and becomes non-conductive near the zero-crossing point (0 [V]) of the AC voltage Vac from the AC power supply 11. . Strictly speaking, after the switch part Q1 becomes conductive, when the current flowing through the switch part Q1 becomes 0 [A], the switch part Q1 becomes non-conductive. The switch portion Q1 may become non-conductive depending on the timing. Therefore, the switch control section 51 makes the switch section Q1 conductive by outputting a switch control signal every half cycle of the AC voltage Vac. That is, the on state of the switch section Q1 herein includes not only a state where the switch section Q1 is continuously conductive but also a state where the switch section Q1 is intermittently conductive. Further, when the switch unit Q1 is turned off, the switch control unit 51 maintains the switch unit Q1 in a non-conductive state by not outputting a switch control signal to the switch unit Q1.

The switching control unit 52 outputs a switching control signal to the switching unit 44 based on the monitoring signal from the voltage monitoring unit 32 when the switch control unit 51 controls the switch unit Q1 to be in the off state. Specifically, based on the monitoring signal from the voltage monitoring unit 32, the switching control unit 52 determines the length of time (hereinafter referred to as “pulse width”) during which the magnitude (absolute value) of the inter-switch voltage Vsw is equal to or greater than a reference value. '') and the threshold value. The switching control unit 52 sends a switching control signal to the switching unit 44 so that the first power supply path 41 is used as a path for supplying power to the power supply unit 43 when a state in which the pulse width is less than the threshold value continues multiple times. Output. Furthermore, when the pulse width is equal to or greater than the threshold value, the switching control unit 52 outputs a switching control signal to the switching unit 44 so that the second power supply path 42 is used as a path for supplying power to the power supply unit 43. That is, the switching control unit 52 determines whether or not the pulse width of the inter-switch voltage Vsw is equal to or greater than the threshold value, so that the power supply path used for the path of the power supplied to the power supply unit 43 is selected between the first power supply path 41 and the second power supply path. The switching unit 44 is controlled to switch between the 42 and 42. Further, in this embodiment, the threshold value is set to about ⅛ of one cycle of the AC voltage Vac. Note that "1/8 of one cycle of AC voltage Vac" is an example of the threshold value, and is not limited to this value. The pulse width of the inter-switch voltage Vsw may be the length of time during which the magnitude (absolute value) of the inter-switch voltage Vsw is less than a reference value. In this case, the switching control unit 52 switches the switching control signal so that the first power supply path 41 is used as a path for supplying power to the power supply unit 43 when a state in which the pulse width is equal to or greater than the threshold value continues multiple times. It is output to section 44. Further, when the pulse width is less than the threshold value, the switching control unit 52 outputs a switching control signal to the switching unit 44 so that the second power supply path 42 is used as a path for supplying power to the power supply unit 43.

Furthermore, when the switch control section 51 controls the switch section Q1 to be in the on state, the switching control section 52 outputs a switching control signal to the switching section 44 regardless of the monitoring signal from the voltage monitoring section 32. That is, while the switch unit Q1 is in the on state, the switching control unit 52 outputs a switching control signal to the switching unit 44 so that the first power supply path 41 is used as a path for supplying power to the power supply unit 43. .

(2.2) Operation Next, the operation of the electronic switch device 1 and the electronic switch system 10 will be described with reference to FIGS. 3 and 4.

FIG. 3 exemplifies the operation when both the switch portions Q1 of the first electronic switch device 1A and the second electronic switch device 1B are in the off state. FIG. 4 exemplifies the operation when the switch section Q1 of the first electronic switch device 1A is in the off state and the switch section Q1 of the second electronic switch device 1B is in the on state. 3 and 4 show, in order from the top, an AC voltage "Vac", an inter-switch voltage "Vsw", a monitoring signal "S1a" of the first electronic switching device 1A, a monitoring signal "S1b" of the second electronic switching device 1B, It shows conduction/non-conduction of the switch part Q1 of the second electronic switch device 1B. Regarding "Q1" representing conduction/non-conduction of the switch portion Q1, "ON" represents conduction and "OFF" represents non-conduction. In the examples of FIGS. 3 and 4, the signal levels of the monitoring signals S1a and S1b are set to L level when the absolute value of the voltage Vsw between the switches is equal to or higher than the reference value Vth1, and the absolute value of the voltage Vsw between the switches is the reference value. When it is less than the value Vth1, it is at H level (High level).

First, the operation when both the switch portions Q1 of the first electronic switch device 1A and the second electronic switch device 1B are in the off state will be described using FIG. 3.

Although FIG. 3 shows the voltage across the switch unit Q1 in the first electronic switch device 1A, the voltage across the switch unit Q1 in the second electronic switch device 1B also shows the voltage across the switch unit Q1 in the first electronic switch device 1A. Same as voltage. Further, in FIG. 3, time t0 is a zero-crossing point when the AC voltage Vac transitions from negative polarity to positive polarity. At time t1, the absolute value of the inter-switch voltage Vsw exceeds the reference value Vth1, and at time t2, the absolute value of the inter-switch voltage Vsw falls below the reference value Vth1. Time t3 is a zero-crossing point when AC voltage Vac transitions from positive polarity to negative polarity. At time t4, the absolute value of the inter-switch voltage Vsw exceeds the reference value Vth1, and at time t5, the absolute value of the inter-switch voltage Vsw falls below the reference value Vth1.

In this state, both the switch portions Q1 of the first electronic switch device 1A and the second electronic switch device 1B are in the off state, so that the inter-switch voltage Vsw of both the two electronic switch devices 1A and 1B is equal to the AC voltage Vac. The voltage will be the same. Therefore, the absolute value of the inter-switch voltage Vsw exceeds the reference value Vth1 during most of the period from time t1 to time t2 and from time t4 to time t5, which are most of the periods in one cycle of AC voltage Vac. As a result, the length (pulse width) of the period during which the absolute value of the inter-switch voltage Vsw is equal to or greater than the reference value Vth1 becomes equal to or greater than the threshold value. Therefore, in both of the two electronic switch devices 1A and 1B, the second power supply path 42 is used as a path for supplying power to the power supply section 43.

Next, the operation when the switch section Q1 of the first electronic switch device 1A is in the off state and the switch section Q1 of the second electronic switch device 1B is in the on state will be described using FIG. 4.

In FIG. 4, time t10 is a zero-crossing point when the AC voltage Vac transitions from negative polarity to positive polarity. At time t11, the absolute value of the inter-switch voltage Vsw exceeds the reference value Vth1, and at time t12 immediately after time t11, the switch portion Q1 of the second electronic switch device 1B is made conductive, and the absolute value of the inter-switch voltage Vsw exceeds the reference value Vth1. below the value Vth1. Time t13 is a zero-crossing point when AC voltage Vac transitions from positive polarity to negative polarity. At time t4, the absolute value of the inter-switch voltage Vsw exceeds the reference value Vth1, and at time t15 immediately after time t14, the switch portion Q1 of the second electronic switch device 1B is made conductive, and the absolute value of the inter-switch voltage Vsw exceeds the reference value Vth1. below the value Vth1.

In this state, while the switch section Q1 of the second electronic switch device 1B is conductive, due to the short circuit between both ends of the switch section Q1 of the second electronic switch device 1B, neither of the two electronic switch devices 1A and 1B is connected. , the inter-switch voltage Vsw becomes approximately 0 [V].

The switch unit Q1 of the second electronic switch device 1B becomes non-conductive near the zero-crossing point (0 [V]) of the AC voltage Vac, and becomes conductive when the absolute value of the inter-switch voltage Vsw exceeds the reference value Vth1. While the absolute value of the inter-switch voltage Vsw is less than the reference value Vth1, the monitoring signals S1a, S1b are at H level, but when the absolute value of the inter-switch voltage Vsw becomes equal to or higher than the reference value Vth1, the monitoring signals S1a, S1b become Become L level. Therefore, in the example of FIG. 4, the monitoring signals S1a and S1b are at H level during the period from time t12 when the switch part Q1 is turned on to time t14 when the absolute value of the inter-switch voltage Vsw reaches the reference value Vth1. At t14, the monitoring signals S1a and S1b become L level.

When the monitoring signal S1b becomes L level, the switch control section 51 of the second electronic switch device 1B makes the switch section Q1 conductive. Therefore, at time t12 immediately after time t11 and time t15 immediately after time t14, the switch portion Q1 of the second electronic switch device 1B becomes conductive, and the inter-switch voltage Vsw becomes approximately 0 [V]. Therefore, at times t12 and t15, the monitoring signals S1a and S1b become H level. While the switch unit Q1 of the second electronic switch device 1B is in the on state, the second electronic switch device 1B repeats the above-described operation. As a result, the inter-switch voltage Vsw is intermittently generated in both of the two electronic switch devices 1A and 1B during the period from time t10 to time t12 and from time t13 to time t15, and electricity will be supplied.

As described above, while the switch portion Q1 of the second electronic switch device 1B is conductive, the inter-switch voltage Vsw of the first electronic switch device 1A is also approximately 0 [V]. Therefore, the first electronic switch device 1A can detect the on/off state of the switch unit Q1 of the second electronic switch device 1B by monitoring the inter-switch voltage Vsw.

In FIG. 4, in the first electronic switch device 1A, the period during which the absolute value of the inter-switch voltage Vsw is equal to or greater than the reference value Vth1 is a short period from time t11 to time t12 and from time t14 to time t15. That is, a state in which the length (pulse width) of the period during which the absolute value of the inter-switch voltage Vsw is equal to or greater than the reference value Vth1 is less than the threshold value occurs continuously. Therefore, in the first electronic switch device 1A, the first power supply path 41 is used as a path for supplying power to the power supply section 43.

In the second electronic switch device 1B, the switching control section 52 causes the switch control section 51 to control the switch section Q1 to turn on, so that the first power supply path 41 is used as a path for supplying power to the power supply section 43. The switching section 44 is controlled so as to.

(3) Advantages As explained above, the electronic switch device 1 according to the first aspect includes the switch section Q1, the power supply section 43, the switch control section 51, and two or more power supply paths (the first power supply path 41, The second power supply path 42), a switching section 44, a voltage monitoring section 32, and a switching control section 52 are provided. The switch unit Q1 is electrically connected between the AC power source 11 and the load 12, and switches conduction/non-conduction between the AC power source 11 and the load 12. The power supply section 43 is electrically connected between both ends of the switch section Q1, and generates a control power supply using the power supplied from the AC power supply 11. The switch control section 51 operates upon receiving control power from the power supply section 43, and controls the switch section Q1. Two or more power feed paths (first power feed path 41, second power feed path 42) are electrically connected between both ends of the switch section Q1, and serve as paths for supplying power between the switch section Q1 and the power supply section 43. . The switching unit 44 switches the power feeding path used as the path of the supplied power to any one of two or more power feeding paths (the first power feeding path 41 and the second power feeding path 42). The voltage monitoring section 32 monitors the magnitude of the inter-switch voltage Vsw, which is the voltage across the switch section Q1. The switching control section 52 controls the switching section 44 based on the waveform of the inter-switch voltage Vsw.

According to this configuration, there are two power feeding paths (the first power feeding path 41 and the second power feeding path 42) as paths for supplying power from the AC power source 11 to the power supply section 43, and the power is transmitted through either of the power feeding paths. Power is supplied to the power supply unit 43. Switching between the two power feed paths (first power feed path 41 and second power feed path 42) is performed based on the inter-switch voltage Vsw. In the electronic switch device 1, the voltage monitoring unit 32 monitors the inter-switch voltage Vsw, thereby making it possible to detect the on/off state of the switch unit Q1 in the other electronic switch device 1. For example, assume that the switch section Q1 of the first electronic switch device 1A is in the off state, and the switch section Q1 of the second electronic switch device 1B is in the on state. In this case, the first electronic switch device 1A, in which the switch portion Q1 is in the off state, can detect that the switch portion Q1 of the second electronic switch device 1B is in the on state, based on the waveform of the inter-switch voltage Vsw. can. Therefore, the first electronic switch device 1A switches the power supply path in response to the on state of the switch unit Q1 in the second electronic switch device 1B. That is, in the electronic switch device 1, the power supply path is switched depending on the on/off state of the switch unit Q1 in the other electronic switch device 1. Thereby, the electronic switch device 1 can supply power to the power supply section 43 using a suitable power supply path, and can secure control power from the inter-switch voltage Vsw. As a result, the electronic switch device 1 does not require a current transformer to ensure control power when the load 12 is energized, and can be downsized.

Furthermore, in a configuration in which the on/off state of the switch section Q1 in another electronic switch device 1 is detected based on the voltage across the capacitor C1 of the power supply section 43, the on/off state of the switch section Q1 may be determined depending on the voltage across the capacitor C1. There is a risk of erroneously detecting the status. In contrast to such a configuration, the electronic switch device 1 of the present embodiment has a configuration that directly detects the on/off state of the switch unit Q1 in another electronic switch device 1 based on the inter-switch voltage Vsw. Therefore, the detection accuracy of the on/off state of the switch section Q1 is high. Therefore, the electronic switch device 1 can supply power to the power supply section 43 using a power supply path more suitable for the on/off state of the switch section Q1 in other electronic switch devices 1.

Furthermore, in the electronic switch device 1 according to the second aspect, in the first aspect, the voltage monitoring section 32 connects the switch section Q1 and two or more power supply paths (the first power supply path 41, the second power supply path 42). It is preferable that an electrical connection be made between the two. According to this configuration, the voltage monitoring section 32 can monitor the inter-switch voltage Vsw before the voltage is dropped by the power supply path (first power supply path 41, second power supply path 42), so that the voltage Vsw between the switches can be monitored. It is possible to improve the detection accuracy of on/off states. However, this configuration is not an essential configuration for the electronic switch device 1.do not have.

Further, in the electronic switch device 1 according to the third aspect, in the first or second aspect, the two or more power feeding paths include the first power feeding path 41 and the second power feeding path 42, and the first power feeding path 41 It is preferable that the impedance is lower than that of the second power supply path 42. According to this configuration, it is possible to switch to a power supply path having a different impedance depending on the on/off state of the switch unit Q1, and it is possible to efficiently secure a control power source from the inter-switch voltage Vsw. However, this configuration is not essential to the electronic switch device 1, and two or more power supply paths may include power supply paths with the same impedance.

Furthermore, in the electronic switch device 1 according to the fourth aspect, in the first or second aspect, the switching control unit 52 generates a pulse whose length of time is equal to or more than the reference value or less than the reference value. It is preferable to control the switching unit 44 based on the width. According to this configuration, the switching control section 52 can detect the on/off state of the switch section Q1 based on the pulse width of the inter-switch voltage Vsw, and complicated arithmetic processing is not required. However, this configuration is not an essential configuration for the electronic switch device 1, and for example, the switching control unit 52 may control the switching unit 44 based on the effective value (average value) of the inter-switch voltage Vsw. Further, the switching control unit 52 may control the switching unit 44 based on the peak value of the inter-switch voltage Vsw in every half cycle of the AC voltage Vac.

Further, in the electronic switching device 1 according to the fifth aspect, in the fourth aspect, the two or more power feeding paths include a first power feeding path 41 and a second power feeding path 42, and the first power feeding path 41 is It is preferable that the impedance is lower than that of the two feed paths 42. It is preferable that the switching control unit 52 controls the switching unit 44 so that the first power feeding path 41 is used as the power supply path when the pulse width is less than the threshold value. According to this configuration, when the switch section Q1 is in the on state and the magnitude of the inter-switch voltage Vsw is small, the first power supply path 41 with low impedance is used as a path for supplying power to the power supply section 43. This makes it possible to efficiently secure control power even when the load 12 is energized. Further, when the switch unit Q1 is in the off state and the inter-switch voltage Vsw is large, the second power supply path 42 having a large impedance is used as a path for supplying power to the power supply unit 43. Thereby, when the switch part Q1 is in the off state, leakage current flowing to the load 12 through the second power supply path 42 can be suppressed, and it becomes possible to suppress the occurrence of malfunction of the load 12. However, this configuration is not an essential configuration for the electronic switch device 1. For example, it is configured to adjust the duty of the current intermittently supplied to the power supply unit 43 according to the on/off state of the switch unit Q1. may have been done.

Further, in the electronic switch device 1 according to the sixth aspect, in any one of the first to fifth aspects, the sensor section 31 is further provided, and the switch control section 51 controls the switch section Q1 based on the output of the sensor section 31. Preferably, the device is configured to control. According to this configuration, the sensor section 31 can be driven by the control power generated by the power supply section 43, and the switch section Q1 can be automatically controlled by the output of the sensor section 31. However, this configuration is not an essential configuration for the electronic switch device 1, and the sensor section 31 may be omitted as appropriate.

Further, the electronic switch system 10 according to the first aspect includes a plurality of electronic switch devices 1 according to any one of the first to sixth aspects, and the plurality of switch parts Q1 included in the plurality of electronic switch devices 1 are The power supply 11 and the load 12 are electrically connected in parallel. When the switch portion Q1 of any one of the plurality of electronic switch devices 1 is in a conductive state, the other electronic switch devices 1 whose switch portion Q1 is in a non-conductive state among the plurality of electronic switch devices 1 are , the switching control unit 52 controls the switching unit 44 so that the power feeding path used as the path of the supplied power is switched.

In other words, the electronic switch system 10 includes a plurality of electronic switch devices 1. Each of the plurality of electronic switch devices 1 includes a switch section Q1, a power supply section 43, a switch control section 51, two or more power supply paths (a first power supply path 41, a second power supply path 42), and a switching section 44. , a voltage monitoring section 32 , and a switching control section 52 . The switch unit Q1 is electrically connected between the AC power source 11 and the load 12, and switches conduction/non-conduction between the AC power source 11 and the load 12. The power supply section 43 is electrically connected between both ends of the switch section Q1, and generates a control power supply using the power supplied from the AC power supply 11. The switch control section 51 operates upon receiving control power from the power supply section 43, and controls the switch section Q1. Two or more power feed paths (first power feed path 41, second power feed path 42) are electrically connected between both ends of the switch section Q1, and serve as paths for supplying power between the switch section Q1 and the power supply section 43. . The switching unit 44 switches the power feeding path used as the path of the supplied power to any one of two or more power feeding paths (the first power feeding path 41 and the second power feeding path 42). The voltage monitoring section 32 monitors the magnitude of the inter-switch voltage Vsw, which is the voltage across the switch section Q1. The switching control section 52 controls the switching section 44 based on the waveform of the inter-switch voltage Vsw. The plurality of switch sections Q1 included in the plurality of electronic switch devices 1 are electrically connected in parallel between the AC power supply 11 and the load 12. When the switch portion Q1 of any one of the plurality of electronic switch devices 1 is in a conductive state, one or more other electronic switches in which the switch portion Q1 of the plurality of electronic switch devices 1 is in a non-conductive state In the device 1, the one or more switching control units 52 control the one or more switching units 44 so that the power feeding path used for the route of the supplied power is switched.

According to this configuration, in each of the plurality of electronic switch devices 1, there are two power feeding paths (the first power feeding path 41 and the second power feeding path 42) as paths for supplying power from the AC power source 11 to the power supply section 43. , power is supplied via either one of the power supply paths. Switching between the two power feed paths (first power feed path 41 and second power feed path 42) is performed based on the inter-switch voltage Vsw. In the electronic switch device 1, the voltage monitoring unit 32 monitors the inter-switch voltage Vsw, thereby making it possible to detect the on/off state of the switch unit Q1 in the other electronic switch device 1. For example, assume that the switch section Q1 of the first electronic switch device 1A is in the off state, and the switch section Q1 of the second electronic switch device 1B is in the on state. In this case, the first electronic switch device 1A, in which the switch portion Q1 is in the off state, can detect that the switch portion Q1 of the second electronic switch device 1B is in the on state, based on the waveform of the inter-switch voltage Vsw. can. Therefore, the first electronic switch device 1A switches the power supply path in response to the on state of the switch unit Q1 in the second electronic switch device 1B. That is, in the electronic switch device 1, the power supply path is switched depending on the on/off state of the switch unit Q1 in the other electronic switch device 1. Thereby, the electronic switch device 1 can supply power to the power supply section 43 using a suitable power supply path, and can secure control power from the inter-switch voltage Vsw. As a result, the electronic switch device 1 does not require a current transformer to ensure control power when the load 12 is energized, and can be downsized. In particular, in an electronic switch system 10 that combines two electronic switch devices 1 each consisting of a three-way switch, both the electronic switch device 1A with the switch section Q1 in the OFF state and the electronic switch device 1B with the switch section Q1 in the ON state , it is possible to secure control power.

(4) Modifications The electronic switch device 1 according to the first embodiment is only an example of the present invention, and the present invention is not limited to the first embodiment, and even if the electronic switch device 1 is other than the first embodiment, the present invention Various changes can be made according to the design, etc., as long as they do not deviate from the technical concept. Modifications of Embodiment 1 are listed below.

The load 12 is not limited to a lighting device, and may be, for example, an electric device such as a ventilation fan or a security device. Further, the load 12 is not limited to one electrical device, but may be a plurality of electrical devices electrically connected in series or parallel.

Further, the switch section Q1 is not limited to a bidirectional thyristor, but may be another semiconductor switch. The switch section Q1 may be, for example, two MOSFETs electrically connected in series between the first connection terminal 101 and the third connection terminal 103. The source terminals of the two MOSFETs are connected to each other, that is, they are connected in so-called anti-series, thereby switching between passing and blocking current in both directions. Furthermore, the switch portion Q1 may be a semiconductor element having a double gate structure using a wide bandgap semiconductor material such as GaN (gallium nitride).

Further, the number of power feed paths (first power feed path 41, second power feed path 43) serving as paths for supplying power to the power supply section 43 is not limited to two, and may be three or more.

Further, a drive circuit for driving the switch section Q1 may be provided separately from the control section 5. In this case, the control power source is also used to operate the drive circuit.

Further, the sensor unit 31 is not limited to a human sensor that detects whether a person is present, but may be a brightness sensor, for example. Alternatively, the sensor section 31 may include both a human sensor and a brightness sensor. Furthermore, the electronic switch device 1 is not limited to a configuration in which the switch portion Q1 is controlled based on the detection result of the sensor portion 31, and may be an electronic switch device with a remote control function, a timer function, or a dimming function, for example. Good too. For example, in the electronic switch device 1 with a remote control function, the control section 5 controls the switch section Q1 based on a wireless signal from a remote controller. Furthermore, the electronic switch device 1 may be configured such that the switch section Q1 is controlled based on a human operation on an operation section such as a push button switch or a touch switch.

Further, the voltage monitoring unit 32 may be configured to monitor the magnitude of the inter-switch voltage Vsw before full-wave rectification instead of the inter-switch voltage Vsw after full-wave rectification. In this case, the voltage monitoring section 32 is electrically connected between the AC input terminals of the rectifier 2. The voltage monitoring unit 32 serves both as a zero-cross detection unit for detecting a zero-cross point and as a state detection unit for detecting the on/off state of the switch unit Q1 of the other electronic switch device 1. , the zero-cross detection section and the state detection section may be provided separately. The state detection unit may be configured to compare only the magnitude of the inter-switch voltage Vsw with a positive reference value, or may be configured to compare only the magnitude of the inter-switch voltage Vsw with a negative reference value.

Further, the switch control section 51 may be configured to conduct the switch section Q1 when a predetermined time has elapsed after the absolute value of the inter-switch voltage Vsw becomes equal to or greater than a reference value. The switch portion Q1 is maintained in a non-conductive state for a predetermined time after the absolute value of the inter-switch voltage Vsw becomes equal to or greater than the reference value. As a result, even if there are variations in the reference values among a plurality of electronic switch devices 1, when the switch section Q1 of another electronic switch device 1 becomes conductive, the inter-switch voltage Vsw of the own electronic switch device 1 is suppressed from not reaching the reference value. Therefore, it is possible to improve the accuracy of detecting the on/off state of the switch unit Q1 of the other electronic switch device 1.

Furthermore, the switch control section 51 may be configured to output a switch control signal to the switch section Q1 based on the voltage across the capacitor C1 of the power supply section 43. The switch control section 51 makes the switch section Q1 conductive when the voltage across the capacitor C1 becomes equal to or higher than the threshold voltage. This threshold voltage is the voltage across the capacitor C1 when the capacitor C1 is charged so that the control section 5 and the sensor section 31 can operate until the switch section Q1 becomes non-conductive. .

Further, the switching control unit 52 controls the first power supply path 41 to be used as the path for supplying power to the power supply unit 43 when the continuous time during which the inter-switch voltage Vsw is less than the reference value continues for a predetermined time or more. It may be configured to control the switching unit 44. If there are variations in the reference values among multiple electronic switch devices 1, the inter-switch voltage Vsw of the own electronic switch device 1 may be at the reference value even though the switch portion Q1 of the other electronic switch device 1 is in the on state. There is a possibility that it will not reach. Even in such a case, it is possible to detect that the switch unit Q1 of the other electronic switch device 1 is in the on state, and the first power supply path 41 with low impedance can be used as a path for supplying power to the power supply unit 43. can.

Furthermore, even when the switch section Q1 is controlled to be in the on state, the switching control section 52 performs switching based on the inter-switch voltage Vsw, as in the case where the switch section Q1 is controlled to be in the off state. It may be configured to control the section 44.

Further, when the pulse width of the inter-switch voltage Vsw is less than the threshold value, the configuration is not limited to the configuration in which only the first power supply path 41 is used as the power supply path of the power supply unit 43. For example, the switching control unit 52 may be configured to alternately switch between the first power supply path 41 and the second power supply path 42 at predetermined intervals when the pulse width of the inter-switch voltage Vsw is less than a threshold value. As a result, when the switch section Q1 is switched from the on state to the off state, current continues to flow to the load 12 via the first power supply path 41, and the switch section Q1 of the other electronic switch device 1 is turned on. /It is possible to improve the detection accuracy of the off state.

Furthermore, when a load switch is employed as the low impedance element of the first power supply path 41, the load switch and the switching section 44 may be used in combination. By turning on the load switch, both ends of the second power supply path 42 are short-circuited by the first power supply path 41, and power is supplied to the power supply section 43 via the first power supply path 41. Further, by turning off the load switch, power is supplied to the power supply section 43 via the second power supply path 42.

Further, the specific circuit of the power supply section 43 is not limited to the circuit shown in FIG. 1, and can be modified as appropriate. In the power supply unit 43, for example, the capacitor C1 may be connected to the output of the regulator 45, or a capacitor other than the capacitor C1 may be connected to the output of the regulator 45. Further, the regulator 45 in the power supply section 43 is not an essential component of the electronic switch device 1, and the regulator 45 may be omitted.

In addition, in Embodiment 1, in the comparison between two values such as the inter-switch voltage and the reference value, "more than" means that the two values are equal, and that one of the two values exceeds the other. including both. However, the present invention is not limited to this, and "more than" herein may be synonymous with "greater than" which includes only the case where one of the two values exceeds the other. In other words, whether or not the two values are equal can be arbitrarily changed depending on the setting of the reference value, etc., so there is no technical difference between "greater than" and "greater than". Similarly, "less than" may have the same meaning as "less than or equal to".

(Embodiment 2)
As shown in FIG. 5, an electronic switch system 10A according to the second embodiment includes a combination of three electronic switch devices 1A, 1B, and 1C. Hereinafter, configurations similar to those in Embodiment 1 will be given the same reference numerals and descriptions will be omitted as appropriate.

The electronic switch devices 1A and 1B are so-called three-way switches as in the first embodiment. On the other hand, the electronic switch device 1C is a so-called four-way switch to which four wires can be connected. The electronic switch device 1C includes a fourth connection terminal 104 in addition to the three connection terminals 101, 102, 103 similar to the electronic switch devices 1A and 1B.

In the electronic switch device 1C, the connection terminal 103 and the connection terminal 104 are connected inside the electronic switch device 1C. The connection terminal 102 of the electronic switch device 1A is connected to the connection terminal 101 of the electronic switch device 1C. The connection terminal 103 of the electronic switch device 1A is connected to the connection terminal 104 of the electronic switch device 1C. The connection terminal 102 of the electronic switch device 1B is connected to the connection terminal 103 of the electronic switch device 1C. The connection terminal 103 of the electronic switch device 1B is connected to the connection terminal 102 of the electronic switch device 1C.

According to the above-mentioned connection relationship, the plurality of switch parts Q1 included in the plurality of (three in this case) electronic switch devices 1A, 1B, and 1C are electrically connected in parallel between the AC power supply 11 and the load 12. be done. Therefore, if the switch part Q1 of any of the three electronic switch devices 1A, 1B, 1C is conductive, the AC power supply 11 and the load 12 are conductive, and the three electronic switch devices 1A, 1B, 1C are connected. Power is supplied to the load 12 from the AC power supply 11 via the AC power supply 11 . Therefore, in the electronic switch system 10A, it is possible to switch the energization state to the load 12 in all of the switch section Q1 of the electronic switch device 1A, the switch section Q1 of the electronic switch device 1B, and the switch section Q1 of the electronic switch device 1C. It is. Therefore, in the electronic switch system 10A that combines the three electronic switch devices 1A, 1B, and 1C, it is possible to switch the energization state to the load 12 at three locations.

Similarly to the first embodiment, the electronic switch system 10A of the present embodiment described above does not require a current transformer to secure control power when the load 12 is energized, and the electronic switch device 1 can be miniaturized. There is an advantage.

Further, as a modification of the second embodiment, the electronic switch system 10A may include two or more electronic switch devices 1C (so-called four-way switches), and a total of four or more electronic switch devices 1A, 1B, 1C. good. In this case, a plurality of switch parts Q1 included in each of the plurality of electronic switch devices 1A, 1B, and 1C are electrically connected in parallel between the AC power source 11 and the load 12, so that the energization state to the load 12 can be changed. can be switched at four or more locations.

The configuration of Embodiment 2 (including modified examples) can be applied in appropriate combination with the configuration of Embodiment 1 (including modified examples).

1, 1A, 1B, 1C Electronic switch device 10, 10A Electronic switch system 11 AC power supply 12 Load 31 Sensor section 32 Voltage monitoring section 41 First power supply path (power supply path)
42 Second power supply line (power supply line)
43 Power supply section 44 Switching section 51 Switch control section 52 Switching control section Q1 Switch section

Claims (6)

a switch unit that is electrically connected between an AC power source and a load and switches conduction/non-conduction between the AC power source and the load;
a power supply unit that is electrically connected between both ends of the switch unit and generates a control power source using power supplied from the AC power supply;
a switch control unit that operates upon receiving the control power from the power supply unit and controls the switch unit;
two or more power supply paths having different impedances, which are electrically connected between both ends of the switch section and serve as paths for the supplied power between the switch section and the power source section;
a switching unit that switches a power supply path used for the power supply route to any one of the two or more power supply paths;
A switching control device for use with a circuit device comprising: a voltage monitoring unit that monitors the magnitude of a voltage across the switch, which is a voltage across the switch unit;
A monitoring signal representing a comparison result between the voltage between the switches and a reference value is acquired from the voltage monitoring unit, and based on the monitoring signal , the length of time during which the voltage between the switches is greater than or equal to the reference value or less than the reference value is determined. Equipped with a switching control section that determines the pulse width that is
The switching control device is characterized in that the switching control unit controls the switching unit based on a comparison result between the pulse width and a threshold value . The switching control device according to claim 1, wherein the voltage monitoring section is electrically connected between the switch section and the two or more power supply paths. The two or more power feeding paths include a first power feeding path and a second power feeding path,
The switching control device according to claim 1 or 2, wherein the first power supply path has a lower impedance than the second power supply path. The switching according to claim 3, wherein the switching control unit controls the switching unit so that the first power feeding path is used as the power supply path when the pulse width is less than the threshold value. Control device. It further includes a sensor section,
The switching control device according to any one of claims 1 to 4, wherein the switch control section is configured to control the switch section based on the output of the sensor section. A plurality of switching control devices according to any one of claims 1 to 5 are provided,
The plurality of switching control devices are used together with the plurality of circuit devices,
The plurality of switch units included in the plurality of circuit devices are electrically connected in parallel between the AC power source and the load,
When the switch portion of any one of the plurality of circuit devices is in a conductive state, the switching control device corresponding to another circuit device whose switch portion is in a non-conductive state among the plurality of circuit devices; In the switching control system, the switching control unit controls the switching unit so that a power feeding path used for the power supply path is switched.

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