JP2020017496A - Load control system - Google Patents

Abstract

To provide a load control system that can control multiple loads individually.SOLUTION: Each of a plurality of switching circuits 10 includes a switch 11 that is electrically connected between a corresponding one of a plurality of second terminals T2 and a first terminal T1. A control circuit 20 controls power supply to a load 3 corresponding to each of the plurality of switching circuits 10 by controlling the switch 11 included in each of the plurality of switching circuits 10. A power supply circuit 30 obtains power from a power supply 2 via some of the second terminals T2 and the first terminal T1, and generates at least power to be supplied to the control circuit 20.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a load control system. More specifically, the present disclosure relates to a load control system that controls a load.

  2. Description of the Related Art Conventionally, a dimming device for dimming a lighting load is known (for example, Patent Document 1).

  The dimmer described in Patent Literature 1 includes a pair of terminals, a control circuit unit, and a control power supply unit that supplies control power to the control circuit unit.

  A control circuit section and a control power supply section are connected in parallel between the pair of terminals. A series circuit of an AC power supply and a lighting load is connected between the pair of terminals. The lighting load includes a plurality of LED (Light Emitting Diode) elements and a power supply circuit for lighting each LED element. The power supply circuit includes a smoothing circuit including a diode and an electrolytic capacitor.

  The control circuit unit includes a switch unit that controls the phase of the AC voltage supplied to the lighting load, a switch drive unit that drives the switch unit, and a control unit that controls the switch drive unit and the control power supply unit.

  The control power supply is connected in parallel to the switch. The control power supply unit converts an AC voltage of the AC power supply into a control power supply. The control power supply unit includes an electrolytic capacitor that stores control power.

  The control unit is supplied with control power from a control power supply unit (power supply unit) through an electrolytic capacitor. The control unit performs anti-phase control to cut off power supply to the lighting load during the half-cycle of the AC voltage according to the dimming level set by the dimming operation unit.

JP 2013-149495 A

  In the light control device (load control system) disclosed in Patent Literature 1, the AC power supply and the lighting load are connected by two electric wires. Therefore, when the AC power supply and the lighting load are connected by two electric wires, respectively. In comparison, the number of electric wires can be reduced, but a plurality of loads cannot be individually controlled.

  An object of the present disclosure is to provide a load control system capable of individually controlling a plurality of loads.

  A load control system according to an embodiment of the present disclosure includes a first terminal, a plurality of second terminals, a plurality of switching circuits, a control circuit, and a power supply circuit. The first terminal is electrically connected to a power supply. The plurality of second terminals correspond to the plurality of loads on a one-to-one basis. Each of the plurality of second terminals is electrically connected to the power supply via a corresponding one of the plurality of loads. The plurality of switching circuits correspond one-to-one with the plurality of second terminals. Each of the plurality of switching circuits has a switch electrically connected between a corresponding one of the plurality of second terminals and the first terminal. The control circuit controls power supply to the load corresponding to each of the plurality of switching circuits by controlling the switches included in each of the plurality of switching circuits. The power supply circuit obtains power from the power supply via a part of the plurality of second terminals and the first terminal, and generates at least power to be supplied to the control circuit.

  According to the present disclosure, it is possible to provide a load control system capable of individually controlling a plurality of loads.

FIG. 1 is a schematic circuit diagram of a load control system according to an embodiment of the present disclosure. FIG. 2 is a front view of the load control system. FIG. 3 is a waveform diagram of each part of the load control system according to the first embodiment. FIG. 4 is a schematic circuit diagram of a load control system according to Modification 1 of one embodiment of the present disclosure. FIG. 5 is a schematic circuit diagram of a load control system according to Modification 2 of one embodiment of the present disclosure. FIG. 6 is a schematic circuit diagram of a load control system according to Modification 3 of one embodiment of the present disclosure. FIG. 7 is an explanatory diagram illustrating an operation when one lamp is in a no-load state in the load control system according to the third modification. FIG. 8 is a schematic circuit diagram of a load control system according to Modification 4 of one embodiment of the present disclosure. FIG. 9 is a schematic circuit diagram of a load control system according to Modification 5 of one embodiment of the present disclosure. FIG. 10 is a schematic circuit diagram of a load control system according to Modification 6 of one embodiment of the present disclosure.

(Embodiment)
(1) Overview As shown in FIG. 1, the load control system 1 according to the present embodiment includes a first terminal T1, a plurality (for example, two) of second terminals T2 (T21, T22), and a plurality (for example, 2). ), A switching circuit 10 (101, 102), a control circuit 20, and a power supply circuit 30.

  The first terminal T1 is electrically connected to a power supply (AC power supply 2).

  The plurality of second terminals T2 (T21, T22) correspond one-to-one to a plurality of (for example, two) loads 3 (3A, 3B).

  The plurality of switching circuits 10 (101, 102) correspond one-to-one to the plurality of second terminals T2 (T21, T22).

  Each of the plurality of second terminals T2 (T21, T22) is electrically connected to a power supply (AC power supply 2) via a corresponding one of the plurality of loads 3 (3A, 3B).

  Each of the plurality of switching circuits 10 (101, 102) is electrically connected between a corresponding one of the second terminals T2 (T21, T22) and the first terminal T1. It has a switch 11.

  The control circuit 20 controls the switches 11 included in each of the plurality of switching circuits 10 (101, 102) to load the load 3 (3A, 3B) corresponding to each of the plurality of switching circuits 10 (101, 102). To control the power supply.

  The power supply circuit 30 obtains power from a power supply (AC power supply 2) through a part of the second terminals T2 (T21, T22) and the first terminal T1 of the plurality of second terminals T2 (T21, T22), and at least controls the control circuit. 20 to generate power to be supplied.

  Here, the “first terminal” and the “second terminal” may not be components (terminals) for connecting electric wires or the like, but may be, for example, leads of an electronic component or a part of a conductor included in a circuit board. There may be.

  The load control system 1 according to the present embodiment has a two-wire load in which a series circuit of the AC power supply 2 and the load 3 is connected by two electric wires, when viewed from each of the plurality of loads 3 (3A, 3B). It is a control device. The plurality of switching circuits 10 (101, 102) correspond one-to-one to the plurality of loads 3 (3A, 3B). Each of the plurality of switching circuits 10 (101, 102) is electrically connected to a corresponding one of the plurality of loads 3 (3A, 3B) with respect to a power supply (AC power supply 2). Thus, the power supply (AC power supply 2) and the load 3 are electrically connected.

  In other words, in order to electrically connect the load 3A to the switching circuit 101, an electric wire a1 connected to a power supply (AC power supply 2) is electrically connected to the first terminal T1 of the load control system 1, and the second terminal An electric wire a21 connected to the load 3A is electrically connected to T21. The switch 11 of the switching circuit 101 is electrically connected between the two electric wires a1 and a21. When the control circuit 20 turns on the switch 11 of the switching circuit 101, an AC voltage Vac from a power supply (AC power supply 2) is applied to the load 3A, and power is supplied to the load 3A. When the control circuit 20 turns off the switch 11 of the switching circuit 101, the AC voltage Vac from the power supply (AC power supply 2) is applied between the first terminal T1 and the second terminal T21, and is applied to the load 3A. Power supply stops.

  In order to electrically connect the load 3B to the switching circuit 102, an electric wire a1 connected to a power supply (AC power supply 2) is electrically connected to a first terminal T1 of the load control system 1, and a second terminal T22. Is electrically connected to a wire a22 connected to the load 3B. The switch 11 of the switching circuit 102 is electrically connected between the two electric wires a1 and a22. When the control circuit 20 turns on the switch 11 of the switching circuit 102, the AC voltage Vac from the AC power supply 2 is applied to the load 3B, and power is supplied to the load 3B. When the control circuit 20 turns off the switch 11 of the switching circuit 102, the AC voltage Vac from the AC power supply 2 is applied between the first terminal T1 and the second terminal T22 to supply power to the load 3B. Stops.

  Here, since the load 3 and the AC power supply 2 are connected in series between each of the plurality of second terminals T2 and the first terminal T1, two AC power supplies 2 and a plurality of loads 3 are provided. The number of electric wires for connecting the plurality of loads 3 can be reduced as compared with the case where the electric wires are connected with each other.

  Further, since the control circuit 20 controls the power supply to the loads 3 corresponding to the respective switching circuits 10 by controlling the switches 11 of the respective switching circuits 10, the power supply to the plurality of loads 3 is individually controlled. Can be controlled. Therefore, according to the present embodiment, it is possible to provide a two-wire type load control system 1 that can individually control a plurality of loads 3.

  In addition, the power supply circuit 30 obtains power from a power supply (AC power supply 2) via a part of the second terminals T2 and the first terminal T1. Therefore, if the load 3 is connected to only some of the second terminals T2 for the power supply circuit 30 to obtain power, the control circuit 20 operates even when the remaining second terminals are in a no-load state. The necessary voltage can be supplied.

  In the present embodiment, as an example, a case where the load 3 is an illumination load including a plurality of LED elements and a lighting circuit for lighting the plurality of LED elements will be described. That is, the load control system 1 constitutes a dimming device that adjusts the magnitude of the light output of the load 3 by, for example, controlling the phase of the voltage supplied to the load 3 including the illumination load by the switch 11. Here, the lighting circuit of the load 3 reads the dimming level from the waveform of the AC voltage Vac phase-controlled by the load control system 1 and changes the magnitude of the light output of the LED element. The lighting circuit of the load 3 includes a current securing circuit such as a bleeder circuit, for example. Therefore, current can flow through the load 3 even during a period in which the switch 11 of the load control system 1 is in a non-conductive state. The AC power supply 2 is, for example, a single-phase 100 [V], 60 [Hz] commercial power supply. Further, the load control system 1 is applicable to, for example, a wall switch or the like.

(2) Details The load control system 1 according to the present embodiment will be described in detail with reference to FIGS.

  As shown in FIG. 1, the load control system 1 includes the above-described first terminal T1, a plurality (for example, two) of second terminals T2 (T21, T22), and a plurality (for example, two) of switching circuits 10 (for example, two). 101, 102), a control circuit 20, and a power supply circuit 30. Further, the load control system 1 further includes a rectifier circuit DB1, an interface unit 40, an insulated power supply circuit 50, an insulated circuit 60, and zero-cross detection units (ZC) 231, 232, 241, 242. Further, the control circuit 20 includes a main control circuit 21 and a sub control circuit 22. In the present embodiment, the control circuit 20 and the power supply circuit 30 are shared by the plurality of switching circuits 10. That is, the control circuit 20 and the power supply circuit 30 include a shared circuit. Here, the shared circuit is shared by the plurality of switching circuits 10. In the present embodiment, since the plurality of switching circuits 10 share the shared circuit, the circuit scale of the entire load control system 1 can be reduced. It is not essential that both the control circuit 20 and the power supply circuit 30 include a shared circuit, and it is sufficient that at least one of the control circuit 20 and the power supply circuit 30 includes one shared circuit. Control circuit 20 may include one shared circuit, and power supply circuit 30 may include one shared circuit. Further, only one of the control circuit 20 and the power supply circuit 30 may include the shared circuit, or both the control circuit 20 and the power supply circuit 30 may not include the shared circuit.

  As described above, each of the plurality of switching circuits 10 (101, 102) electrically connects between the corresponding one of the second terminals T2 (T21, T22) and the first terminal T1. It has a switch 11 that is electrically connected.

  The switch 11 includes, for example, two switch elements Q1 and Q2 electrically connected in series between the first terminal T1 and the corresponding second terminal T2 among the plurality of second terminals T2 (T21 and T22). Consists of For example, each of the switch elements Q1 and Q2 is a semiconductor switch element composed of a MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor).

  The switching elements Q1 and Q2 are connected in a so-called anti-series manner between the first terminal T1 and the corresponding second terminal T2 among the plurality of second terminals T2 (T21 and T22). That is, the sources of the switch elements Q1 and Q2 are connected to each other. The drain of the switch element Q1 is connected to the first terminal T1, and the drain of the switch element Q2 is connected to the corresponding second terminal T2. Here, the sources of the switching elements Q1 and Q2 included in the switching circuit 101 are electrically connected to the ground of the power supply circuit 30. The sources of the switching elements Q1 and Q2 included in the switching circuit 102 are electrically connected to the ground of the insulating power supply circuit 50 that supplies power to the switching circuit 102.

  The switch 11 of each switching circuit 10 can switch between four states by a combination of ON and OFF of the switch elements Q1 and Q2. The switching elements Q1 and Q2 are turned on or off by the control circuit 20, respectively. Here, the four states include a “bidirectional off state” in which both switch elements Q1 and Q2 are off, a “bidirectional on state” in which both switch elements Q1 and Q2 are on, and a switch element Q1. , Q2 are ON, and there are two types of “one-way ON state”. In the one-way ON state, of the switch elements Q1 and Q2, one-way conduction is provided between the first terminal T1 and the second terminal T2 from the ON switch element through the parasitic diode of the OFF switch element. Will be. For example, when the switch element Q1 is on and the switch element Q2 is off, a “first one-way ON state” in which a current flows from the first terminal T1 to the second terminal T2. When the switch element Q2 is on and the switch element Q1 is off, a "second one-way ON state" in which a current flows from the second terminal T2 to the first terminal T1. Therefore, when the AC voltage Vac is applied from the AC power supply 2 between the first terminal T1 and the second terminal T2, the positive polarity of the AC voltage Vac, that is, in the half cycle of the positive polarity of the first terminal T1 is the first voltage. The one-way ON state is a “forward ON state”, and the second one-way ON state is a “reverse ON state”. On the other hand, in the negative polarity of the AC voltage Vac, that is, in the half cycle of the positive polarity of the second terminal T2, the second one-way ON state is a “forward ON state”, and the first one-way ON state is a “reverse ON state”. ".

  Here, the switch 11 is in a “conducting state” in which a current flows to the load 3 (3A, 3B) via the switch 11 in both the “bidirectional ON state” and the “forward direction ON state”. The switch 11 is in a “non-conducting state” in which no current flows to the load 3 (3A, 3B) via the switch 11 in both the “bidirectional off state” and the “reverse on state”. In the present embodiment, the control circuit 20 controls the switch elements Q1 and Q2 to be on or off in the positive half cycle or the negative half cycle of the AC voltage Vac, thereby turning the switch 11 “on”. Alternatively, it can be controlled to “non-conductive state”.

  The zero cross detectors 231 and 232 detect a zero cross point of the AC voltage Vac applied between the first terminal T1 and the second terminal T21.

  The zero-cross detecting unit 231 compares the voltage of the first terminal T1 with a predetermined threshold. When the zero-cross detecting unit 231 detects that the voltage having the first terminal T1 as the positive electrode has shifted from the state below the threshold to the state above the threshold, the AC voltage Vac shifts from the negative half cycle to the positive half cycle. Is determined to be a zero crossing point. When detecting the zero-cross point, the zero-cross detector 231 outputs a detection signal to the sub-control circuit 22.

  When the zero-cross detecting unit 232 detects that the voltage having the second terminal T21 as a positive electrode has shifted from a state below the threshold to a state above the threshold, the AC voltage Vac changes from a positive half cycle to a negative half cycle. Is determined to be the zero crossing point when shifting to. When detecting the zero-cross point, the zero-cross detector 232 outputs a detection signal to the sub-control circuit 22.

  Here, the threshold value is a value (absolute value) set near 0 [V]. For example, the threshold values of the zero-cross detection units 231 and 232 are each about several [V]. Therefore, the detection points of the zero cross points detected by the zero cross detection units 231 and 232 are slightly delayed from the zero cross point (0 [V]) in a strict sense.

  Similarly, the zero-cross detectors 241 and 242 detect a zero-cross point of the AC voltage Vac applied between the first terminal T1 and the second terminal T22. When detecting the zero-cross points, the zero-cross detectors 241, 242 output a detection signal to the sub-control circuit 22. Here, the ground of the zero-cross detection units 241 and 242 (that is, the ground of the insulated power supply circuit 50 that supplies power to the zero-cross detection units 241 and 242) and the ground of the power supply circuit 30 are different. , 242 are input to the sub-control circuit 22 via an insulating circuit (for example, a photocoupler or the like).

  An input level that defines brightness for each of the loads 3A and 3B is input to the interface unit (operation unit) 40. The input level defines the timing at which switch 11 is turned on or turned off in a half cycle of AC voltage Vac. The interface unit 40 may receive different input levels for the loads 3A and 3B, or the same input level. In the present embodiment, since the load control system 1 is a dimming device, the interface unit 40 receives an operation by a user and receives an input of a dimming level as an input level. The interface unit 40 outputs a dimming signal indicating the dimming level to the main control circuit 21. The dimming signal is a numerical value or the like that specifies the magnitude of the light output of the load 3, and may include an “OFF level” for turning off the load 3. In the present embodiment, as an example, the interface unit 40 includes a touch panel 41 (see FIG. 2) that receives a user's touch operation. The touch panel 41 is held on the surface of the container body 90 of the load control system 1, and is configured to be able to accept a user's touch operation in a state where the container body 90 of the load control system 1 is attached to a building material 100 such as a wall. Have been. The interface unit 40 may be any configuration that outputs a signal representing an input level (dimming level), and is, for example, a variable resistor, a rotary switch, or an operation button disposed on the surface of the body. Is also good. Further, the interface section 40 may include a plurality of operation sections corresponding to the plurality of switching circuits 10 on a one-to-one basis. The control circuit 20 controls on / off of a switch 11 of the switching circuit 10 corresponding to one of the plurality of switching circuits 10 based on an operation input from one of the plurality of switching sections. I do. In the present embodiment, the interface unit 40 is realized by the touch panel 41. For example, by performing a predetermined operation (operation such as right slide, left slide, etc.) on the touch panel 41, the load 3 to be operated is switched, and then the touch panel 41 is switched. The user performs a predetermined operation (for example, upward slide, downward slide, etc.) to operate the dimming level of the load 3 to be operated. In other words, a single touch panel 41 implements a plurality of operation units corresponding to the plurality of opening / closing circuits 10 on a one-to-one basis. May be realized by the operation buttons or the like. In addition, one operation unit corresponding to one switching circuit 10 performs a plurality of operations related to one switching circuit 10 (for example, an operation of switching on / off, an operation of increasing a dimming level, an operation of decreasing a dimming level, and the like). A set of operation elements (for example, operation buttons and the like) for performing the operation.

  Further, the interface unit 40 may further include a display unit (indicator) for displaying the input brightness (dimming level) of the load 3. The interface unit 40 includes, for example, a display unit including a plurality of LED elements, and displays an input level based on the number of lighting of the LED elements.

  Next, the control circuit 20 will be described. In the present embodiment, the control circuit 20 includes a main control circuit 21 and a sub control circuit 22.

  For example, the main control circuit 21 and the sub-control circuit 22 each have a microcontroller having one or more processors and one or more memories as main components. The functions of the main control circuit 21 and the sub-control circuit 22 are realized by the processor of the microcontroller executing the program recorded in the memory of the microcontroller. The program may be recorded in a memory, may be provided through an electric communication line such as the Internet, or may be recorded in a non-temporary recording medium such as a memory card and provided. In the present embodiment, the main control circuit 21 and the sub-control circuit 22 are realized by separate microcontrollers, but the main control circuit 21 and the sub-control circuit 22 may be realized by one microcontroller.

  The main control circuit 21 has a communication function of communicating with the control base unit 5 by a wireless communication method. Here, the communication function of the main control circuit 21 is, for example, a communication function conforming to a communication standard for specific low-power radio, but conforming to a communication method such as Bluetooth (registered trademark), Wi-Fi (registered trademark), or the like. Communication module may be used.

  The main control circuit 21 outputs a control signal indicating the dimming level of the load 3 (3A, 3B) to be controlled to the sub control circuit 22 based on the control signal received from the control master device 5. Further, the main control circuit 21 has a function of receiving an operation input from the interface unit 40. The main control circuit 21 outputs a control signal indicating the dimming level of the load 3 (3A, 3B) to be controlled to the sub control circuit 22 based on the operation input received from the operation unit 40.

  The sub-control circuit 22 outputs a control signal S1 to the switching circuit 101 based on the control signal of the load 3A input from the main control circuit 21 and the detection signals input from the zero-cross detectors 231 and 232, On / off of the switch 11 of the circuit 101 is controlled. In the present embodiment, since the ground of the switching circuit 101 and the ground of the sub-control circuit 22 are common, the control signal S1 output from the sub-control circuit 22 is directly input to the switching circuit 101. The sub-control circuit 22 controls on / off of the switch 11 by individually controlling the switch elements Q1 and Q2 of the switch 11 included in the switching circuit 101, and controls the AC voltage Vac supplied from the AC power supply 2 to the load 3A. The phase is controlled by the switch 11 of the switching circuit 101.

  In addition, the sub control circuit 22 outputs a control signal S2 to the switching circuit 102 based on the control signal of the load 3B input from the main control circuit 21 and the detection signals input from the zero cross detection units 241 and 242. , The on / off of the switch 11 of the switching circuit 102 is controlled. In the present embodiment, since the ground of the switching circuit 102 and the ground of the sub-control circuit 22 are not common, the control signal S2 output from the sub-control circuit 22 is input to the switching circuit 102 via the insulating circuit 60. . The sub-control circuit 22 controls on / off of the switch 11 by individually controlling the switch elements Q1 and Q2 of the switch 11 included in the switching circuit 102, and controls the AC voltage Vac supplied from the AC power supply 2 to the load 3B. The phase is controlled by the switch 11 of the switching circuit 102.

  Here, the “phase control” is to change a phase angle (conduction angle) at which the energization of the load 3 is started and a phase angle at which the energization of the load 3 is ended for each half cycle of the AC voltage Vac. Means a method of controlling the AC voltage Vac supplied (applied) to the load 3. In the present embodiment, the sub-control circuit 22 performs “reverse phase control” in which power supply to the loads 3A and 3B is interrupted in the middle of each half cycle of the AC voltage Vac.

  In the present embodiment, there is provided an insulating circuit 60 that electrically insulates between the switching circuit 102 and the control circuit 20 (specifically, the sub-control circuit 22). By electrically insulating the switching circuit 102 and the control circuit 20 from each other, the insulating circuit 60 transmits signals such as control signals S1 and S2 between the switching circuit 102 and the control circuit 20 having different ground levels. be able to. Since the control circuit 20 obtains power from the power supply circuit 30, the insulating circuit 60 electrically insulates the switching circuit 102 and the control circuit 20 from each other so that the switching circuit 102 and the power supply circuit 30 This means that they are electrically insulated from each other. In the present embodiment, the insulation circuit 60 electrically insulates between the switching circuit 102 and the control circuit 20. However, the insulation circuit includes at least one of the control circuit 20 and the power supply circuit 30 and a plurality of switching circuits. At least a part of the circuit 10 may be electrically insulated. Although the insulation circuit 60 electrically insulates between the input and the output by a light transmission element such as a photocoupler, the input and output are controlled by using an electromagnetic transmission element such as a transformer. May be electrically insulated.

  Next, the power supply circuit 30 will be described.

  A rectifier circuit DB1 is connected between the first terminal T1 and the second terminal T21. The power supply circuit 30 is electrically connected between the first terminal T1 and the second terminal T21 via the rectifier circuit DB1. The AC voltage Vac applied between the first terminal T1 and the second terminal T21 is full-wave rectified by the rectifier circuit DB1, and the rectified voltage is input to the power supply circuit 30.

  As a result, the power supply circuit 30 converts the DC voltage input from the rectifier circuit DB1 into a DC voltage having a predetermined voltage value, and switches the switching circuit 10, the control circuit 20 (the main control circuit 21 and the sub-control circuit 22) and The power is supplied to the insulated power supply circuit 50 and the like. That is, the power supply circuit 30 obtains electric power from the AC power supply 2 through a part of the second terminals T21 (T21, T22) and the first terminal T1 of the plurality of second terminals T2 (T21, T22), and It generates power to be supplied to the control circuit 20, the insulated power supply circuit 50, and the like.

  Here, the power supply circuit 30 includes a first power supply circuit that generates a voltage to be supplied to the switching circuit 101, the control circuit 20, the insulated power supply circuit 50, and the like during the ON period of the load 3; A second power supply circuit that generates a voltage to be supplied to the insulated power supply circuit 50 and the like.

  The first power supply circuit generates a voltage during the ON period of the load 3 (when the load 3 is turned on). When the switching circuit 101 is turned on, the voltage between the first terminal T1 and the second terminal T21 is increased. The voltage will be approximately zero. Since the load control system 1 of the present embodiment controls the load 3 in the opposite phase, the first power supply circuit receives the AC power from the AC power supply 2 during the period from the zero-cross point of the AC voltage Vac until the switching circuit 101 becomes conductive. Getting power. For example, the first power supply circuit includes a charging element (for example, a capacitor or the like) that is charged by a current input from the rectifier circuit DB1 during a period from a zero-cross point of the AC voltage Vac to a time when the switching circuit 101 is turned on. The first power supply circuit supplies a voltage generated between both ends of the charging element to the switching circuit 101, the control circuit 20, the insulated power supply circuit 50, and the like. Note that the first power supply circuit is not limited to a circuit including a charging element, and can be appropriately changed.

  The second power supply circuit generates a voltage to be supplied to the switching circuit 101, the control circuit 20, the insulated power supply circuit 50, and the like during the off period of the load 3 (when the load 3 is turned off). During the off period of the load 3, the AC voltage Vac is applied between the first terminal T1 and the second terminal T21, and the rectified pulsating voltage from the rectifier circuit DB1 is applied to the power supply circuit 30. The second power supply circuit is, for example, a series regulator type dropper power supply, converts the pulsating voltage input from the rectifier circuit DB1 into a DC voltage having a predetermined voltage value, and converts the converted DC voltage into the switching circuit 101. The power is supplied to the circuit 20 and the insulated power supply circuit 50 and the like. Note that the second power supply circuit is not limited to the dropper power supply, and can be appropriately changed.

  The insulated power supply circuit 50 converts a voltage input from the power supply circuit 30 into a predetermined voltage and supplies the same to the switching circuit 102, the insulating circuit 60, and the like. The insulated power supply circuit 50 electrically insulates the input side and the output side using an electromagnetic coupling element such as a transformer, and is connected to the ground on the input side of the insulated power supply circuit 50 (that is, the ground of the power supply circuit 30). , And the ground on the output side of the insulated power supply circuit 50 is different.

(3) Operation Next, the operation of the load control system 1 of the present embodiment will be described with reference to FIGS.

(3.1) Operation when turning off two lights When the load control system 1 turns off both the loads 3A and 3B in response to a control signal from the control master unit 5 or an operation input from the interface unit 40. Will be described.

  When the main control circuit 21 outputs a control signal for turning off both the loads 3A and 3B to the sub-control circuit 22, the sub-control circuit 22 uses the OFF-level dimming signals as the control signals S1 and S2 and the switching circuits 101 and 102. Output to The switching circuit 101 maintains the switch 11 in a non-conductive state based on the control signal S1 input from the sub-control circuit 22, and turns off the load 3A. When the control signal S2 from the sub-control circuit 22 is input via the insulating circuit 60, the switching circuit 102 keeps the switch 11 non-conductive based on the control signal S2 and turns off the load 3B. .

  When the switches 11 of the switching circuits 101 and 102 are non-conductive, the AC voltage Vac of the AC power supply 2 is applied between both ends of the switches 11 of the switching circuits 101 and 102, respectively.

  In this case, the power supply circuit 30 can obtain power from the AC power supply 2 via the first terminal T1 and the second terminal T21 (in other words, via the rectifier circuit DB1), and the switching circuit 10, the control circuit 20, and the Electric power to be supplied to the insulated power supply circuit 50 and the like can be generated. The insulated power supply circuit 50 converts the voltage input from the power supply circuit 30 into a DC voltage having a predetermined voltage value, and supplies the DC voltage to the switching circuit 102, the insulation circuit 60, the zero-cross detectors 241, 242, and the like.

(3.2) Operation when One or Two Lights are Turned On When the main control circuit 21 turns on the load 3 </ b> A in response to a control signal from the control base unit 5 or an operation input from the interface unit 40. The operation will be described with reference to FIGS. In FIG. 3, Vac is an AC voltage of the AC power supply 2, VL is a voltage generated between both ends of the load 3A, and V10 is a voltage generated between both ends of the switching circuit 101.

  The main control circuit 21 outputs a control signal indicating the dimming level of the load 3A to the sub-control circuit 22 in order to dimming the load 3A. The sub-control circuit 22 changes the control signal S1 for turning on or off the switch 11 on the basis of the control signal input from the main control circuit 21 and the detection signals of the zero-cross detectors 231 and 232, into the switching circuit 101. Output to As a result, the switch 11 of the switching circuit 101 conducts in the range of the phase angle corresponding to the dimming level in each half cycle of the AC voltage Vac, so that the load 3A is dimmed and lit at the desired dimming level.

  Here, the operation in which the load control system 1 dims the load 3A in the half cycle of the positive polarity of the AC voltage Vac will be described in detail with reference to FIG. Based on the result of the zero-crossing detection unit 231 detecting the zero-crossing point of the AC voltage Vac, the sub-control circuit 22 performs timing (time t1 in FIG. 3) at which the first period TA1 has elapsed from the zero-crossing point (time t0 in FIG. 3). Then, the switch 11 of the switching circuit 101 is controlled to a conductive state. The first period TA1 is a period required for the power supply circuit 30 to generate a required voltage, and is a period until the output voltage of the power supply circuit 30 exceeds a predetermined lower limit voltage. When the output voltage of the power supply circuit 30 input from the power supply circuit 30 exceeds the lower limit voltage, the sub control circuit 22 determines that the first period TA1 has elapsed from the zero cross point of the AC voltage Vac.

  Here, in the positive half cycle of the AC voltage Vac, in the first period TA1 from the zero crossing point (time t0) of the AC voltage Vac to the time t1, the switch 11 of the switching circuit 101 is non-conductive. Therefore, the power supply circuit 30 can perform an operation of generating a voltage to be supplied to the switching circuit 101, the control circuit 20, the insulated power supply circuit 50, and the like by receiving power supply from the AC power supply 2.

  Next, at the timing when the conduction period T10 according to the dimming level has elapsed from the time point t1 (time point t2 in FIG. 3), the sub-control circuit 22 controls the switch 11 of the switching circuit 101 to the non-conduction state. Is output. As a result, during the conduction period T10 from the time point t1 to the time point t2, power is supplied from the AC power supply 2 to the load 3A via the switch 11 of the switching circuit 101, so that the load 3A is turned on at a predetermined dimming level.

  Thereafter, when the absolute value of the voltage value of the AC voltage Vac falls below a predetermined reference voltage (time t3 in FIG. 3), the power supply circuit 30 executes a voltage generation operation. This reference voltage is set to a voltage lower than the voltage value at which the load 3A can operate. If the absolute value of the voltage value of the AC voltage Vac is equal to or less than the reference voltage, the load 3A will not light up even if the power supply circuit 30 executes the voltage generation operation. Thus, even in the second period TA2 from the time point t3 to the zero-cross point of the AC voltage Vac (time point t4 in FIG. 3), the power supply circuit 30 can receive power from the AC power supply 2. Therefore, the power supply circuit 30 can execute the voltage generation operation by receiving the power supply from the AC power supply 2 also in the second period TA2.

  Next, the operation of the load control system 1 in the half cycle of the negative polarity of the AC voltage Vac will be described. Based on the result of the zero-crossing detection unit 232 detecting the zero-crossing point of the AC voltage Vac, the sub-control circuit 22 performs timing (time t5 in FIG. 3) when the first period TA1 has elapsed from the zero-crossing point (time t4 in FIG. 3). Then, the switch 11 of the switching circuit 101 is controlled to a conductive state.

  Here, in the first period TA1 from the zero-cross point (time t4) of the AC voltage Vac to the time t5, the switch 11 of the switching circuit 101 is in a non-conductive state, and the power supply circuit 30 receives power supply from the AC power supply 2. Thus, a voltage generating operation can be performed.

  Next, the sub-control circuit 22 controls the switch 11 of the opening / closing circuit 102 to a non-conductive state at a timing when a conductive period T10 according to the dimming level has elapsed from the time t5 (time t6 in FIG. 3). As a result, during the conduction period T10 from the time point t5 to the time point t6, power is supplied from the AC power supply 2 to the load 3A via the switch 11 of the switching circuit 101, so that the load 3A is turned on at a predetermined dimming level.

  Thereafter, when the absolute value of the voltage value of the AC voltage Vac falls below a predetermined reference voltage (time t7 in FIG. 3), the power supply circuit 30 executes a voltage generation operation. Thus, even in the second period TA2 from the time point t7 to the zero cross point of the AC voltage Vac (time point t8 in FIG. 3), the power supply circuit 30 can receive power supply from the AC power supply 2. Therefore, the power supply circuit 30 can receive power from the AC power supply 2 even in the second period TA2 and generate power to be supplied to the switching circuit 101, the control circuit 20, the insulated power supply circuit 50, and the like.

  The load control system 1 dimly lights the load 3A by alternately repeating the operation in the half cycle of the positive polarity of the AC voltage Vac and the operation in the half cycle of the negative polarity of the AC voltage Vac.

  When the main control circuit 21 dims and lights the load 3 </ b> B, the sub control circuit 22 switches based on the control signal input from the main control circuit 21 and the detection signals of the zero-cross detection units 241 and 242. 11 is turned on / off. Here, since the power supply circuit 30 obtains power from the AC power supply 2 via the first terminal T1 and the second terminal T21, if the switch 11 of the switching circuit 101 is in a non-conducting state, the switching circuit 102 Power can be obtained from the AC power supply 2 even when the switch 11 is conductive. Accordingly, the sub-control circuit 22 turns on the switch 11 of the switching circuit 102 at a timing when a predetermined time has elapsed from the zero cross point in each half cycle of the AC voltage Vac. Further, the sub-control circuit 22 controls the switch 11 to be in a non-conductive state at a timing when a conductive period according to the dimming level has elapsed from the time when the switch 11 of the switching circuit 102 is in the conductive state, and controls the load 3B. Lighting can be performed at a dimming level according to a signal.

  Since the power supply circuit 30 can obtain power from the AC power supply 2 even when the load 3B is on, when the load 3B is fully lit, the sub-control circuit 22 turns on the switch 11 of the switching circuit 101. The switching circuit 101 may be controlled so as to keep the state.

  As described above, in the present embodiment, the power supply circuit 30 obtains power from the AC power supply 2 via the first terminal T1 and a part of the second terminal T2 (for example, the second terminal T21), and sends the power to the control circuit 20. Power is being supplied. Then, the control circuit 20 individually controls the plurality of loads 3 by individually controlling the plurality of switching circuits 10. Therefore, it is possible to realize the load control system 1 that can individually control the loads 3.

(4) Modifications The above embodiment is merely one of various embodiments of the present disclosure. The above embodiment can be variously modified according to the design and the like as long as the object of the present disclosure can be achieved.

  Hereinafter, modified examples of the above embodiment will be listed. The modifications described below can be applied in appropriate combinations.

  The load control system 1 according to the present disclosure includes a computer system. The computer system mainly has a processor and a memory as hardware. The function as the load control system 1 in the present disclosure is realized by the processor executing the program recorded in the memory of the computer system. The program may be pre-recorded in the memory of the computer system, may be provided through an electric communication line, or may be recorded in a non-transitory recording medium such as a memory card, an optical disk, or a hard disk drive readable by the computer system. May be provided. A processor of a computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). An integrated circuit such as an IC or an LSI referred to here differs depending on the degree of integration, and includes an integrated circuit called a system LSI, a VLSI (Very Large Scale Integration), or a ULSI (Ultra Large Scale Integration). Furthermore, a logic device which is programmed after the manufacture of the LSI and which can reconfigure an FPGA (Field-Programmable Gate Array) or a connection relation inside the LSI or a circuit section inside the LSI may be adopted as a processor. Can be. The plurality of electronic circuits may be integrated on one chip, or may be provided separately on a plurality of chips. The plurality of chips may be integrated in one device, or may be provided separately in a plurality of devices. The computer system includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller is also composed of one or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

  It is not an essential configuration of the load control system 1 that a plurality of functions in the load control system 1 are integrated in one housing (body 90). May be provided separately. Further, at least a part of the functions of the load control system 1 may be realized by a cloud (cloud computing) or the like.

  In the load control system 1 of the above embodiment, the number of the loads 3 is two, but three or more loads 3 may be individually controlled. That is, the number of the second terminals T2 and the number of the switching circuits 10 connected between the second terminal T2 and the first terminal T1 may be three or more, and the three or more loads 3 can be individually controlled. In this case, the power supply circuit 30 may be electrically connected to a part of the three or more second terminals T2. Here, if the power supply circuit 30 is connected to two or more second terminals T2, power can be obtained from the AC power supply 2 via the plurality of second terminals T2 and the first terminal T1. Therefore, even if a part of the two or more second terminals T2 is in a no-load state, power can be obtained through the remaining second terminals T2.

  The load control system 1 of the above embodiment is not limited to the load 3 using an LED element as a light source, but is applicable to a light source that has a capacitor input type circuit, has a high impedance, and is lit with a small current. An example of this type of light source is an organic EL (Electroluminescence) element. Further, the load control system 1 is applicable to loads 3 of various light sources such as a discharge lamp.

  Further, the load 3 controlled by the load control system 1 is not limited to an illumination load, and may be, for example, a heater, a fan, or the like. When the load 3 is a heater, the load control system 1 adjusts the amount of heat generated by the heater by adjusting the average power supplied to the heater. When the load 3 is a fan, the load control system 1 configures a regulator that adjusts the rotation speed of the fan.

  In addition, the switch 11 is not limited to the switch element Q1 and the switch element Q2 formed of MOSFETs, but may be, for example, two IGBTs (Insulated Gate Bipolar Transistors) connected in anti-series. Further, in the switch 11, the rectifying element (diode) for realizing the one-way ON state is not limited to the parasitic diode of the switch elements Q1 and Q2, but may be an external diode. The diode may be contained in the same package as each of the switching elements Q1 and Q2. The switch 11 may be a semiconductor element having a double gate (dual gate) structure using a wide band gap semiconductor material such as GaN (gallium nitride). According to this configuration, the conduction loss of the switch 11 can be reduced.

  In the control of the switch 11, it is also possible to control the switch to the "forward ON state" instead of the "bidirectional ON state". Can also be controlled. In addition, it is also possible to control to "reverse direction ON state" instead of "bidirectional OFF state", and to control to "bidirectional OFF state" instead of "reverse direction ON state". That is, the switch 11 does not need to change its conductive state or non-conductive state.

  Further, the control method of the switch 11 is an anti-phase control method. However, the power supply to the loads 3A and 3B is started in the middle of each half cycle of the AC voltage Vac, and at the zero cross point of the next half cycle of the AC voltage Vac. A positive phase control method for interrupting the power supply to the loads 3A and 3B may be used. Further, the control method of the switch 11 may be a universal control method capable of coping with both the normal phase control method and the reverse phase control method.

  Further, in the comparison of two values such as a voltage value, a part that is “above” may be “greater”. In other words, whether or not the comparison of the two values includes the case where the two values are equal can be arbitrarily changed depending on the setting of the reference value or the like, so that there is no technical difference between “greater than” and “greater than”. Similarly, “below” may be “below”.

(4.1) Modification 1
As shown in FIG. 4, the load control system 1 according to the first modification further includes a series circuit of a resistor R1 and a light emitting diode LD1 connected between a first terminal T1 and a second terminal T22. This is different from the above embodiment. Hereinafter, the same components as those of the above-described embodiment will be denoted by the same reference numerals, and the description thereof will not be repeated.

  Here, if the load 3A is connected between the first terminal T1 and the second terminal T21 and the load 3B is connected between the first terminal T1 and the second terminal T22, the control circuit 20 controls the load 3A. , 3B are turned on or off, respectively. Here, when the load 3B is turned on (that is, when the switching circuit 102 is turned on), the voltage between both ends of the switching circuit 102 becomes substantially zero, and the light emitting diode LD1 is turned off. When the load 3B is turned off (that is, when the switching circuit 102 is turned off), the AC voltage Vac is applied across the switching circuit 102, so that the light emitting diode LD1 is turned on. Accordingly, the light emitting diode LD1 emits light when the load 3B is turned off, so that the position of the load control system 1 can be displayed by the light of the light emitting diode LD1.

  Here, when the load 3 </ b> A is not connected or breaks down, so that no load occurs between the first terminal T <b> 1 and the second terminal T <b> 21, the power supply circuit 30 may obtain power from the AC power supply 2. No, the control circuit 20 stops operating. In this case, when the control circuit 20 stops operating, the load 3B also stops operating, but the AC voltage Vac is applied across the switching circuit 102, so that the light emitting diode LD1 is always lit. Therefore, although the load 3B is connected, the load 3B does not operate, and the light emitting diode LD1 continues to emit light. Therefore, the user operates in a no-load state between the first terminal T1 and the second terminal T21. It can be inferred that the load control system 1 has failed.

  In the first modification, a light emitting element such as the light emitting diode LD1 is connected between the first terminal T1 and the second terminal T21 via the resistor R1, but a neon lamp other than the light emitting diode LD1 or the like is used. May be connected. In the first modification, a light emitting element such as a light emitting diode may be connected between the first terminal T1 and the second terminal T22 via a resistor.

(4.2) Modification 2
As shown in FIG. 5, the load control system 1 according to the modified example 2 further includes a first circuit block B1 and a plurality (for example, two) of second circuit blocks B2 (B21, B22). This is different from the embodiment. Hereinafter, the same components as those of the above-described embodiment will be denoted by the same reference numerals, and the description thereof will not be repeated.

  The plurality of second circuit blocks B2 have a second connection unit. Specifically, the second circuit block B21 has a second connection portion 82, and the second circuit block B22 has a second connection portion 83. Part of the second connection part 82 of the second circuit block B21 is electrically connected to the first connection part 81 of the first circuit block B1, and the rest of the second connection part 82 of the second circuit block B21 is It is electrically connected to the second connection part 83 of the second circuit block B22. Part of the second connection part 83 of the second circuit block B22 is electrically connected to the first connection part 81 of the first circuit block B1, and the rest of the second connection part 83 of the second circuit block B22 is It is electrically connected to the second connection part 82 of the second circuit block B21. The second circuit blocks B21 and B22 are electrically connected to the first circuit block B1 via the second connection portions 82 and 83 by connecting the second connection portions 82 and 83 to the first connection portion 81. . Here, the first connection portion 81 and the second connection portions 82 and 83 may be formed of an appropriate conductive connection member such as a connector, a jumper wire, or an electric wire.

  The first circuit block B1 houses a circuit including at least a part of the control circuit 20 (all of the control circuit 20 in the second modification) and at least a part of the power supply circuit 30 (all of the power supply circuit 30 in the second modification). The first housing 91 is provided.

  The second circuit blocks B21 and B22 correspond one-to-one to the plurality of switching circuits 101 and 102, and the second circuit blocks B21 and B22 accommodate one corresponding switching circuit 10 among the switching circuits 101 and 102. The second housings 921 and 922 are provided. That is, the second circuit block B21 has a second housing 921 that houses the switching circuit 101, and the second circuit block B22 has a second housing 922 that houses the switching circuit 102. The second housings 921 and 922 are detachable from the first housing 91, respectively.

  Here, the case 90 of the load control system 1 includes a first housing 91 and second housings 921 and 922, and when the second housings 921 and 922 are attached to the first housing 91. The second connection portions 82 and 83 are electrically connected to the first connection portion 81. The first housing 91 and the second housings 921 and 922 are detachable, and the load control system 1 is realized by attaching the second circuit blocks B21 and B22 to the modularized first circuit block B1. it can.

(4.3) Modification 3
6 and 7, the load control system 1 according to the third modification selects a part of the second terminals T2 for the power supply circuit 30 to obtain power from among the plurality of second terminals T2. This embodiment differs from the above embodiment in further including the selection circuits 72 and 73. Further, the load control system 1 according to the third modification further includes a selection circuit 71 that selects an output destination of the control signals S1 and S2 from the sub control circuit 22. Hereinafter, the same components as those of the above-described embodiment will be denoted by the same reference numerals, and the description thereof will not be repeated.

  The selection circuits 72 and 73 switch the grounds of the switching circuits 101 and 102 according to the control signal from the sub-control circuit 22, thereby changing the second terminal T2 to which the input terminal of the rectifier circuit DB1 is connected to the second terminal T21. , T22. The selection circuits 72 and 73 are each configured by, for example, a contact of an electromagnetic relay. The selection circuits 72 and 73 connect the ground of the switching circuit 101 to one of the ground of the power supply circuit 30 and the ground of the insulated power supply circuit 50 according to a control signal from the sub control circuit 22. Note that the selection circuits 72 and 73 are not limited to those constituted by the contacts and the like of the electromagnetic relay, but may be constituted by semiconductor relays and the like.

  Further, the selection circuit 71 responds to the control signal from the sub-control circuit 22 to output the control signal S1 to the switching circuit 101 and the control signal S2 to the switching circuit 102, and to output the control signal S1 to the switching circuit 102. And the state in which the control signal S1 is output to the switching circuit 102. The selection circuit 71 is configured by, for example, a contact of an electromagnetic relay, but may be configured by a semiconductor relay or the like.

  Here, the sub-control circuit 22 determines whether or not the load 3A is connected between the first terminal T1 and the second terminal T21 based on the detection signals of the zero-cross detectors 231 and 232.

  FIG. 6 shows a contact state of the selection circuits 71 to 73 when the load 3A is connected between the first terminal T1 and the second terminal T21. When the load 3A is connected between the first terminal T1 and the second terminal T21, the sub-control circuit 22 connects the switching circuit 101 to the ground of the power supply circuit 30, and connects the switching circuit 102 and the insulated power supply circuit 50 to each other. The selection circuits 72 and 73 are controlled so that the ground is connected. The sub-control circuit 22 controls the selection circuit 71 such that the control signal S1 is output to the switching circuit 101 and the control signal S2 is output to the switching circuit 102. Thus, the input terminal of the rectifier circuit DB1 is electrically connected between the first terminal T1 and the second terminal T21. The power supply circuit 30 obtains power from the AC power supply 2 via the first terminal T1 and the second terminal T21, and can generate a voltage to be supplied to the switching circuit 101, the control circuit 20, the insulated power supply circuit 50, and the like. .

  FIG. 7 shows a contact state of the selection circuits 71 to 73 when the load 3A is not connected between the first terminal T1 and the second terminal T21. When the load 3A is not connected between the first terminal T1 and the second terminal T21, the sub-control circuit 22 connects the switching circuit 101 to the ground of the power supply circuit 30, and connects the switching circuit 102 and the isolated power supply circuit 50 to each other. The selection circuits 72 and 73 are controlled so that the ground is connected. The sub-control circuit 22 controls the selection circuit 71 such that the control signal S1 is output to the switching circuit 102 and the control signal S2 is output to the switching circuit 101. As a result, the input terminal of the rectifier circuit DB1 is electrically connected between the first terminal T1 and the second terminal T22. The power supply circuit 30 obtains power from the AC power supply 2 via the first terminal T1 and the second terminal T22, and can generate a voltage to be supplied to the switching circuit 101, the control circuit 20, the insulated power supply circuit 50, and the like. . Further, the control circuit 20 outputs the control signal S1 to the switching circuit 102, so that the on / off of the load 3B can be controlled.

(4.4) Modification 4
As shown in FIG. 8, the load control system 1 according to Modification 4 includes power supply circuits 30A and 30B for each of the switching circuits 101 and 102, and controls the switching circuits 101 and 102 from the sub-control circuit 22. Is different from the embodiment of FIG. Hereinafter, the same components as those of the above-described embodiment will be denoted by the same reference numerals, and the description thereof will not be repeated.

  A rectifier circuit DB2 is connected between the first terminal T1 and the second terminal T22. The power supply circuit 30B is electrically connected between the first terminal T1 and the second terminal T22 via the rectifier circuit DB2. The AC voltage Vac applied between the first terminal T1 and the second terminal T22 is full-wave rectified by the rectifier circuit DB1, and the rectified voltage is input to the power supply circuit 30B.

  The power supply circuit 30B converts the DC voltage input from the rectifier circuit DB2 into a DC voltage having a predetermined voltage value, and supplies the DC voltage to the switching circuit 102, the insulating circuits 61 and 62, and the like. Therefore, the power supply circuit 30B can supply a gate drive voltage to the switching circuit 102.

  The sub-control circuit 22 outputs a control signal S1 to the switching circuit 101 based on the control signal of the load 3A input from the main control circuit 21 and the detection signals of the zero-cross detection units 231 and 232, On / off of the switch 11 is controlled. Thereby, the sub control circuit 22 can control the power supply to the load 3A.

  Further, the sub control circuit 22 generates the control signal S2 based on the control signal of the load 3B input from the main control circuit 21 and the detection signal input from the zero cross detection units 241 and 242 via the insulating circuit 62. Output to the switching circuit 102. When the control signal S2 from the sub-control circuit 22 is input to the switching circuit 102 via the insulating circuit 61, the switch 11 of the switching circuit 102 turns on / off according to the control signal S2. Thereby, the sub control circuit 22 can control the power supply to the load 3B.

  In the fourth modification, the power supply circuits 30A and 30B for supplying the gate driving voltage to the switching circuits 10 are provided for each of the switching circuits 10. Controlled to non-conducting state. That is, in the fourth modification, since the shared circuit shared by the plurality of switching circuits 10 includes the control circuit 20 and the plurality of switching circuits 10 share the control circuit 20, the circuit scale of the entire load control system 1 is reduced. Can be reduced.

(4.5) Modification 5
The load control system 1 according to Modification 5 differs from Modification 4 in that sub-control circuits 221 and 222 are provided for each of the switching circuits 101 and 102 as shown in FIG. Hereinafter, the same components as those of the above-described modified example 4 are denoted by the same reference numerals, and the description will be appropriately omitted.

  The main control circuit 21 outputs a control signal S11 for controlling the load 3A to the sub-control circuit 221 based on the control signal received from the control master unit 5 or the operation input received from the interface unit 40, and controls the load 3B. The control signal S21 is output to the sub control circuit 222.

  The sub control circuit 221 generates a control signal S12 for controlling the switching circuit 101 based on the control signal S11 input from the main control circuit 21, and outputs the control signal S12 to the switching circuit 101. The switch 11 of the switching circuit 101 is turned on / off based on a control signal S12 input from the sub-control circuit 221 and power supply to the load 3A is controlled.

  When the control signal S21 from the main control circuit 21 is input via the insulating circuit 63, the sub-control circuit 222 generates a control signal S22 for controlling the switching circuit 101 based on the control signal S21. The control signal S22 is output to the switching circuit 102. The switch 11 of the switching circuit 102 is turned on / off based on a control signal S22 input from the sub-control circuit 222, and power supply to the load 3B is controlled.

  Here, in the fifth modification, the control circuit 20 includes a main control circuit 21 and a plurality of sub-control circuits 221 and 222. The plurality of sub-control circuits 221 and 222 correspond to the plurality of switching circuits 101 and 102 on a one-to-one basis. The main control circuit 21 controls the plurality of sub-control circuits 221 and 222. Each of the plurality of sub-control circuits 221 and 222 controls the switch 11 of the corresponding one of the plurality of switching circuits 101 and 102. Thus, in the fifth modification, the main control circuit 21 is shared by the plurality of switching circuits 10. That is, the main control circuit 21 which is a part of the control circuit 20 is shared by the plurality of switching circuits 10, so that the circuit scale of the entire load control system 1 can be reduced.

(4.6) Modification 6
The load control system 1 according to Modification 6 differs from the above-described embodiment in that the switching circuit 102 includes a switch 12 that does not require a power supply, such as a relay contact, as shown in FIG. Hereinafter, the same components as those of the above-described embodiment will be denoted by the same reference numerals, and the description thereof will not be repeated.

  Since the switching circuit 102 includes the switch 12 that does not require a power supply, a power supply for driving the switching circuit 102 is not required. The control signal S2 from the sub-control circuit 22 is input to the switching circuit 102 via the insulating circuit 60, and the switch 12 of the switching circuit 102 is turned on or off according to the control signal S2. Therefore, the sub-control circuit 22 can control power supply to the load 3B by controlling on / off of the switch 12 of the switching circuit 102.

  The switch 12 is not limited to a relay contact, and may be any switch element other than a relay contact as long as it does not require a power source, such as a triac.

(Summary)
As described above, the load control system (1) according to the first embodiment includes a first terminal (T1), a plurality of second terminals (T2), a plurality of switching circuits (10), and a control circuit (20). ) And a power supply circuit (30). The first terminal (T1) is electrically connected to the power supply (2). The plurality of second terminals (T2) correspond one-to-one to the plurality of loads (3). The plurality of switching circuits (10) correspond one-to-one to the plurality of second terminals (T2). Each of the plurality of second terminals (T2) is electrically connected to the power supply (2) via a corresponding one of the plurality of loads (3). Each of the plurality of switching circuits (10) is a switch () electrically connected between a corresponding second terminal (T2) and a first terminal (T1) among the plurality of second terminals (T2). 11, 12). The control circuit (20) controls the switches (11, 12) of each of the plurality of switching circuits (10) to supply power to the load (3) corresponding to each of the plurality of switching circuits (10). Control. The power supply circuit (30) obtains power from the power supply (2) through a part of the second terminals (T2) and the first terminal (T1) of the plurality of second terminals (T2), and at least controls the power supply. Generating power to be supplied to the circuit (20).

  According to this aspect, it is possible to provide a load control system (1) that can individually control a plurality of loads (3).

  A load control system (1) according to a second aspect is the load control system according to the first aspect, further comprising a selection circuit (72, 73) for selecting some of the second terminals (T2) from the plurality of second terminals (T2). Further provision.

  According to this aspect, the power supply circuit (30) obtains power from the power supply (2) via the second terminal (T2) and the first terminal (T1) selected by the selection circuits (72, 73). be able to.

  In a load control system (1) according to a third aspect, in the first or second aspect, at least one of the control circuit (20) and the power supply circuit (30) includes one shared circuit. The shared circuit is shared by a plurality of switching circuits (10).

  According to this aspect, the circuit scale can be reduced by sharing the shared circuit with the plurality of switching circuits (10).

  In a load control system (1) according to a fourth aspect, in the third aspect, the power supply circuit (30) includes a shared circuit.

  According to this aspect, the circuit scale can be reduced by sharing the power supply circuit (30) with the plurality of switching circuits (10).

  In a load control system (1) according to a fifth aspect, in the third aspect, the control circuit (20) includes a main control circuit (21) and a plurality of sub-control circuits (221, 222). The plurality of sub-control circuits (221, 222) correspond one-to-one to the plurality of switching circuits (10). The main control circuit (21) controls a plurality of sub-control circuits (221, 222). Each of the plurality of sub-control circuits (221, 222) controls a switch (11, 12) included in a corresponding one of the plurality of switching circuits (10).

  According to this aspect, the circuit scale can be reduced by sharing the main control circuit (21) with the plurality of switching circuits (10).

  A load control system (1) according to a sixth aspect is the load control system according to the first to fifth aspects, wherein at least one of the control circuit (20) and the power supply circuit (30) and at least a part of the plurality of switching circuits (10) are provided. And an insulation circuit (60) for electrically insulating between the two.

  According to this aspect, at least one of the control circuit (20) and the power supply circuit (30) and at least a part of the plurality of switching circuits (10) are electrically insulated by the insulating circuit (60). Thus, the circuit can be operated normally.

  A load control system (1) according to a seventh aspect, in the first to sixth aspects, further includes a first circuit block (B1) and a plurality of second circuit blocks (B21, B22). Each of the plurality of second circuit blocks (B21, B22) has a second connection portion (82, 83) electrically connected to the first connection portion (81) of the first circuit block (B1). , And are electrically connected to the first circuit block (B1) via the second connection portions (82, 83). The first circuit block (B1) has a first housing (91) that houses a circuit including at least a part of the control circuit (20) and at least a part of the power supply circuit (30). The plurality of second circuit blocks (B21, B22) correspond one-to-one to the plurality of switching circuits (10). Each of the plurality of second circuit blocks (B21, B22) has a second housing (921, 922) that accommodates a corresponding one of the plurality of switching circuits (10).

  According to this aspect, the load control system (1) can be configured by connecting the first circuit block (B1) and the plurality of second circuit blocks (B21, B22).

  The load control system (1) according to an eighth aspect is the load control system according to the first to seventh aspects, further comprising a plurality of operation units (40) corresponding to the plurality of switching circuits (10) on a one-to-one basis. The control circuit (20) corresponds to one of the plurality of switching circuits (10) based on an operation input from one of the plurality of operation units (40). The switches (11, 12) of the switching circuit (10) are controlled.

  According to this aspect, the user can control the power supply to the desired load (3) by operating the operation unit (40).

  The configurations according to the second to eighth aspects are not essential configurations for the load control system (1), and can be omitted as appropriate.

1 Load control system 2 AC power supply (power supply)
Reference Signs List 3 load 10 switching circuit 11, 12 switch 20 control circuit 21 main control circuit 30 power supply circuit 40 interface section (operation section)
Reference Signs List 60 Insulation circuit 71, 72, 73 Selection circuit 81 First connection part 82, 83 Second connection part 91 First case 221, 222 Sub-control circuit 921, 922 Second case B1 First circuit block B21, B21 Second circuit block T1 First terminal T2, T21, T22 Second terminal

Claims (8)

A first terminal, a plurality of second terminals, a plurality of switching circuits, a control circuit, and a power supply circuit;
The first terminal is electrically connected to a power supply;
The plurality of second terminals correspond one-to-one to a plurality of loads,
Each of the plurality of second terminals is electrically connected to the power supply via a corresponding one of the plurality of loads,
The plurality of switching circuits correspond one-to-one to the plurality of second terminals,
Each of the plurality of switching circuits has a switch electrically connected between a corresponding one of the plurality of second terminals and the first terminal,
The control circuit, by controlling the switch of each of the plurality of switching circuits, controls the power supply to the load corresponding to each of the plurality of switching circuits,
The power supply circuit obtains power from the power supply through a part of the second terminals and the first terminal, and generates power to be supplied to at least the control circuit.
Load control system. A selection circuit that selects the part of the second terminals from the plurality of second terminals;
The load control system according to claim 1. At least one of the control circuit and the power supply circuit includes one shared circuit,
The shared circuit is shared by the plurality of switching circuits,
The load control system according to claim 1. The power supply circuit includes the shared circuit,
The load control system according to claim 3. The control circuit includes a main control circuit and a plurality of sub-control circuits,
The plurality of sub-control circuits correspond one-to-one to the plurality of switching circuits,
The main control circuit controls the plurality of sub-control circuits,
Each of the plurality of sub-control circuits controls the switch of a corresponding one of the plurality of switching circuits,
The load control system according to claim 3. At least one of the control circuit and the power supply circuit, further comprising an insulating circuit for electrically insulating between at least a part of the plurality of switching circuits,
The load control system according to claim 1. A first circuit block, and a plurality of second circuit blocks;
Each of the plurality of second circuit blocks has a second connection portion electrically connected to a first connection portion of the first circuit block, and the first circuit block is connected via the second connection portion. Electrically connected to
The first circuit block has a first housing that houses a circuit including at least a part of the control circuit and at least a part of the power supply circuit,
The plurality of second circuit blocks correspond one-to-one to the plurality of switching circuits,
Each of the plurality of second circuit blocks has a second housing that accommodates a corresponding one of the plurality of switching circuits.
The load control system according to claim 1. A plurality of operation units corresponding to the plurality of switching circuits on a one-to-one basis,
The control circuit controls the switch included in the switching circuit corresponding to the one operation unit among the plurality of switching circuits, based on an operation input from one of the plurality of operation units.
The load control system according to claim 1.

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