TW202027396A - Load control circuit, load control method, and program - Google Patents

Abstract

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Description

Load control circuit, load control method and program

The present invention generally relates to load control circuits, load control methods, and programs. In more detail, the present invention relates to a load control circuit, a load control method, and a program for controlling a load by a bidirectional switch.

Document 1 (JP2011-87260A) discloses a 2-wire load control device connected in series between a commercial power supply and a load. The load control device includes: a main switching unit; an operation switch; and a control unit. The main switching unit has a main switching element (three-pole body current switch) connected in series to the commercial power supply and the load, and controls the operation of supplying electric power to the load. The operating relationship is operated by the user, and at least a start signal for starting the load is output. The control part is connected to the operation switch, and cooperates with the signal transmitted from the operation switch to control the opening and closing of the main opening and closing part.

The object of the present invention is to provide a load control circuit, a load control method, and a program that are not easily restricted by the load that can be used.

A load control circuit of one aspect of the present invention includes: a bidirectional switch; a voltage-driven first switching element; a self-holding second switching element; and a control unit. The aforementioned bidirectional switch is electrically connected between the power source and the load, and switches conduction/non-conduction between the aforementioned power source and the aforementioned load. The first switching element and the second switching element are electrically connected in parallel to the control terminal of the bidirectional switch, and switch whether to supply driving power from the power source to the bidirectional switch. The control unit synchronizes the on/off of each of the first switching element and the second switching element to control the bidirectional switch.

In one aspect of the load control method of the present invention, the on/off of each of the voltage-driven first switching element and the self-holding second switching element is synchronized to control the bidirectional switch. The aforementioned bidirectional switch is electrically connected between the power source and the load, and switches conduction/non-conduction between the aforementioned power source and the aforementioned load. The first switching element and the second switching element are electrically connected in parallel to the control terminal of the bidirectional switch, and switch whether to supply driving power from the power source to the bidirectional switch. A program of one aspect of the present invention is a program for making one or more processors execute the above-mentioned load control method.

(1) Summary The load control circuit 10 of this embodiment is as shown in FIG. 1, is electrically connected between the power source 11 and the load 12, and is used to switch the energized state from the power source 11 to the load 12. The power source 11 is, for example, a single-phase commercial power source of 100 [V] and 60 [Hz]. The load 12 may include, for example, a light source having solid light emitting elements such as LED (Light Emitting Diode), and a ventilation fan. The ventilation fan may include an AC motor type ventilation fan, a DC motor type ventilation fan, a ventilation fan with an electronic circuit, or a ventilation fan with an electric switch attached. That is, the load 12 may include an inductive load.

The load control circuit 10 is housed, for example, in a housing of a switch installed on a wall of a house. As an example, the switch includes a switch having a timer function that switches the energized state from the power source 11 to the load 12 in accordance with a set time. In addition, the switch includes, for example, a switch that switches the energized state from the power source 11 to the load 12 in accordance with the detection result of the human body sensor or the brightness sensor. In addition, the above-mentioned switch also has a function of switching the energized state from the power source 11 to the load 12 by accepting an operation from any user.

The load control circuit 10 includes: a bidirectional switch Q0; a first switching element Q1 of a voltage drive type; a second switching element Q2 of a self-holding type; and a control unit 1. The bidirectional switch Q0 is electrically connected between the power source 11 and the load 12, and switches the conduction/non-conduction between the power source 11 and the load 12.

Among them, the bidirectional switch Q0 is connected between the connection terminal 101 and the connection terminal 102 of the load control circuit 10. In other words, inside the load control circuit 10, the connection terminal 101 and the connection terminal 102 are electrically connected via the bidirectional switch Q0. Therefore, if the bidirectional switch Q0 is in the ON state, the connection terminal 101 and the connection terminal 102 are turned on via the bidirectional switch Q0. In addition, when the bidirectional switch Q0 is in the off state, the connection terminal 101 and the connection terminal 102 become non-conductive. In other words, when the bidirectional switch Q0 is turned on, the power supply 11 and the load 12 are turned on, and the power supply 11 supplies power to the load 12. In this embodiment, the on state of the bidirectional switch Q0 is not only a state in which the bidirectional switch Q0 is continuously on, but also includes a state in which the bidirectional switch Q0 is intermittently on. That is, the on state of the bidirectional switch Q0 is a state in which power is supplied from the power source 11 to the load 12, and the off state of the bidirectional switch Q0 is a state in which the power supply from the power source 11 to the load 12 is stopped.

The first switching element Q1 is a voltage-driven type, that is, a switch that switches on/off according to the magnitude of the voltage applied to the control terminal of the first switching element Q1. In this embodiment, the first switching element Q1 is a FET (Field Effect Transistor). The second switching element Q2 is a self-holding type, that is, once it is turned on, it maintains the on state until the holding current becomes zero. In this embodiment, the second switching element Q2 is a thyristor.

The first switching element Q1 and the second switching element Q2 are electrically connected in parallel to the control terminal T1 of the bidirectional switch Q0. In addition, the first switching element Q1 and the second switching element Q2 are switches for switching whether to supply driving power from the power source 11 to the bidirectional switch Q0, as described later. The "driving power" of the present invention is the power (voltage) supplied to the control terminal T1 of the bidirectional switch Q0 for the bidirectional switch Q0.

The control unit 1 controls the bidirectional switch Q0 by synchronizing the on/off of each of the first switching element Q1 and the second switching element Q2. Specifically, the control unit 1 controls the on/off of each of the first switching element Q1 and the second switching element Q2 based on the time when the zero crossing of the load voltage V1 applied from the power supply 11 to the load 12 is detected.

As described above, in this embodiment, both the voltage-driven first switching element Q1 and the self-holding second switching element Q2 are used to control the bidirectional switch Q0. Therefore, in this embodiment, it is possible to use a load 12 of a type that is difficult to use when only the first switching element Q1 is used to control the bidirectional switch Q0. Similarly, in this embodiment, it is possible to use a load 12 of a type that is difficult to use when controlling the bidirectional switch Q0 using only the second switching element Q2. That is, in the present embodiment, there is an advantage that it is not easily restricted by the load 12 that can be used.

(2) Details Hereinafter, the configuration of the load control circuit 10 of this embodiment will be described in detail with reference to FIG. 1. In the following, it is assumed that the load control circuit 10 is used for a switch having a timer function. In addition, in the following, it is assumed that the load 12 connected to the load control circuit 10 is a light source or a ventilation fan having the above-mentioned solid-state light-emitting element.

As described above, the load control circuit 10 includes: two connection terminals 101 and 102; a bidirectional switch Q0; a first switching element Q1; a second switching element Q2; and a control unit 1. The two connection terminals 101 and 102 are respectively Wiring is a part connected electrically or mechanically. The two connection terminals 101 and 102, the bidirectional switch Q0, the first switching element Q1, the second switching element Q2, and the control unit 1 are housed in one housing. The “terminals” such as the “connecting terminals” in this embodiment may not be parts (terminals) for connecting the power cord, and may be, for example, wires of electronic parts or part of conductors included in the circuit board.

Between the two connection terminals 101 and 102, the parallel circuit of the capacitor C1 and the varistor VR1 is electrically connected. In addition, the connection terminal 101 of one of the two connection terminals 101 and 102 is electrically connected to the AC input terminal A1 of one of the pair of AC input terminals A1 and A2 of the rectifier DB1 via the inductor L1.

The rectifier DB1 is composed of a diode bridge and has: a pair of AC input terminals A1, A2; and a pair of DC output terminals B1, B2. The rectifier DB1 rectifies the full-wave rectification of the voltage applied between the two ends of the bidirectional switch Q0 (hereinafter also referred to as "inter-switch voltage"), and then outputs the full-wave rectified voltage from a pair of DC output terminals B1 and B2 .

The bidirectional switch Q0 is electrically connected between the power source 11 and the load 12, and switches the conduction/non-conduction between the power source 11 and the load 12. In this embodiment, the bidirectional switch Q0 is composed of a 3-terminal bidirectional thyristor (triode flow switch). The bidirectional switch Q0 is electrically connected between the connection terminal 101 and the connection terminal 102, and switches the passage/blocking of the bidirectional current between the connection terminal 101 and the connection terminal 102. The control terminal T1 (gate terminal) of the bidirectional switch Q0 is electrically connected to the AC input terminal A2 of one of the pair of AC input terminals A1 and A2 of the rectifier DB1.

In addition, the control terminal T1 of the bidirectional switch Q0 is electrically connected to the connection terminal 102 via a circuit composed of resistors R1, R2 and a capacitor C2. The connection point of the resistors R1 and R2 is electrically connected to the AC input terminal A2 of one of the AC input terminals A1 and A2 of the rectifier DB1. The connection point of the capacitor C2 and the resistor R1 is electrically connected to the control terminal T1 of the bidirectional switch Q0. In addition, the connection point of the capacitor C2 and the resistor R2 is electrically connected to the connection terminal 102.

The first switching element Q1 is electrically connected to the DC output terminal B1 on the high potential side among the pair of DC output terminals B1 and B2 of the rectifier DB1 via a resistor R6. In other words, the first switching element Q1 is electrically connected to the control terminal T1 of the bidirectional switch Q0 via the rectifier DB1. In this embodiment, the first switching element Q1 is composed of an enhanced n-channel MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor). In other words, the first switching element Q1 is a field effect transistor.

The drain terminal of the first switching element Q1 is electrically connected to the DC output terminal B1 on the high potential side of the rectifier DB1 via the resistor R6. The source terminal of the first switching element Q1 is electrically connected to the DC output terminal B2 (ground) on the low potential side of the rectifier DB1. The gate terminal of the first switching element Q1 is electrically connected to the control unit 1 via a parallel circuit of a resistor R3 and a capacitor C3. Then, the first switching element Q1 inputs the voltage signal, that is, the first control signal Sig1, from the control unit 1 to the gate terminal to switch conduction/non-conduction between the pair of DC output terminals B1 and B2 of the rectifier DB1.

The second switching element Q2 is electrically connected to the DC output terminal B1 on the high potential side among the pair of DC output terminals B1 and B2 of the rectifier DB1 via a resistor R5. In other words, the second switching element Q2 is electrically connected to the control terminal T1 of the bidirectional switch Q0 via the rectifier DB1. In this embodiment, the second switching element Q2 is composed of a thyristor (anti-blocking 3-terminal thyristor).

The anode of the second switching element Q2 is electrically connected to the DC output terminal B1 on the high potential side of the rectifier DB1 via the resistor R5. The cathode of the second switching element Q2 is electrically connected to the DC output terminal B2 (ground) on the low potential side of the rectifier DB1. The gate of the second switching element Q2 is electrically connected to the control unit 1 via a parallel circuit of a resistor R4 and a capacitor C4. Then, the second switching element Q2 inputs a current signal, that is, a second control signal Sig2, from the control unit 1 to the gate to switch conduction/non-conduction between the pair of DC output terminals B1 and B2 of the rectifier DB1.

Here, if the first switching element Q1 and the second switching element Q2 are non-conducting, a sufficiently large control voltage (gate voltage) is not applied to the control terminal T1 of the bidirectional switch Q0, and the bidirectional switch Q0 is kept non-conducting status. In addition, if at least one of the first switching element Q1 and the second switching element Q2 is turned on, the current flows through the rectifier DB1, and a sufficiently large control voltage is applied to the control terminal T1 of the bidirectional switch Q0, so that the dual The direction switch Q0 is turned on. That is, the first switching element Q1 and the second switching element Q2 are electrically connected in parallel to the control terminal T1 of the bidirectional switch Q0, and switch whether to supply driving power from the power source 11 to the bidirectional switch Q0. Furthermore, the bidirectional switch Q0 is a self-holding switch, and the load voltage V1 applied to the load 12 is zero-crossing, that is, if the holding current flowing through the bidirectional switch Q0 becomes zero, it switches to a non-conducting state.

As an example, the control unit 1 is mainly composed of a computer system having one or more processors and one or more memories. The processor implements the function of the control unit 1 by executing the program recorded in the memory. The program can be pre-recorded in the memory, can also be recorded on a temporary recording medium like a memory card to be provided, or provided through an electrical communication loop.

The control unit 1 has a function of indirectly controlling the bidirectional switch Q0 by controlling the first switching element Q1 and the second switching element Q2. Specifically, the control unit 1 outputs the first control signal Sig1 to the control terminal (gate terminal) of the first switching element Q1 to switch the conduction/non-conduction of the first switching element Q1. In addition, the control unit 1 outputs the second control signal Sig2 to the control terminal (gate) of the second switching element Q2 to switch the conduction/non-conduction of the second switching element Q2. As described above, if at least one of the first switching element Q1 and the second switching element Q2 is turned on, the bidirectional switch Q0 is switched to the on state. In addition, if both the first switching element Q1 and the second switching element Q2 are in the non-conducting state, and the holding current flowing through the bidirectional switch Q0 becomes zero, the bidirectional switch Q0 is switched to the non-conducting state.

The control unit 1 accepts an on-control instruction generated by a user's operation, or executes control to switch the two-way switch Q0 to the on state when the time is set by the user in advance. Thereby, electric power is supplied from the power source 11 to the load 12, and the load 12 is driven.

Here, the control unit 1 monitors the zero crossing of the voltage between the switches (indirectly monitors the load voltage V1 applied to the load 12) by monitoring the magnitude of the voltage (inter-switch voltage) applied to the two-way switch Q0. Specifically, the control unit 1 compares the magnitude of the voltage between the connection terminal 101 and the ground (reference potential point) with a reference value (for example, 12 [V]), and detects that the connection terminal 101 among the connection terminals 101 and 102 becomes The zero crossing of the voltage between switches at high potential. In addition, the control unit 1 compares the magnitude of the voltage between the connection terminal 102 and the ground with a reference value, and detects a zero crossing when the connection terminal 102 among the connection terminals 101 and 102 becomes a high potential. In addition, only a slight difference can occur between the time point of the zero crossing detected by the control unit 1 and the strictly defined time point of the zero crossing (the time point when the load voltage V1 becomes 0 [V]).

Then, the control unit 1 turns on/off the first switching element Q1 every time a zero crossing of the voltage between the switches is detected (the load voltage V1 applied to the load 12 is indirectly detected). That is, in this embodiment, the control unit 1 controls the first switching element Q1 based on the zero crossing of the load voltage V1 applied to the load 12. Then, in this embodiment, the control unit 1 turns on the first switching element Q1 every half cycle of the load voltage V1 applied to the load 12.

Here, when the control unit 1 detects the zero crossing of the voltage between the switches when the first switching element Q1 is in the on state, it turns on the second switching element Q2 before switching the first switching element Q1 to the off state. That is, in the present embodiment, the control unit 1 turns on the second switching element Q2 during the on period of the first switching element Q1. Then, since the second switching element Q2 is a self-holding switch, when the holding current flowing through the second switching element Q2, that is, the load voltage V1 applied to the load 12 becomes zero, the switching is switched to the off state. The time when the second switching element Q2 is switched to the off state is the off period of the first switching element Q1. That is, the control unit 1 turns off the second switching element Q2 during the turn-off period of the first switching element Q1 by adjusting the time when the second switching element Q2 is turned on.

In this way, the control unit 1 controls the on/off of each of the first switching element Q1 and the second switching element Q2 based on the time when the zero crossing of the load voltage V1 applied from the power supply 11 to the load 12 is detected. Then, in accordance with the on/off of each of the first switching element Q1 and the second switching element Q2, the conduction/non-conduction of the bidirectional switch Q0 is switched. That is, the control unit 1 controls the bidirectional switch Q0 by synchronizing the on/off of each of the first switching element Q1 and the second switching element Q2.

(3) Action Hereinafter, the operation of the load control circuit 10 of this embodiment will be described with reference to FIGS. 2 and 3. Hereinafter, it is assumed that the control unit 1 receives an ON control instruction generated by a user's operation, and then executes control to turn the two-way switch Q0 into an ON state. In addition, "Q1" and "Q2" in FIG. 3 indicate the on/off states of the first switching element Q1 and the on/off states of the second switching element Q2, respectively.

First, the control unit 1 can continuously monitor the voltage between the switches. Then, the control unit 1 detects the zero crossing of the voltage between the switches (indirectly detects the load voltage V1) (S1). Then, the control unit 1 sends the first control signal Sig1 to the control terminal of the first switching element Q1 by applying the first control signal Sig1 to the control terminal of the first switching element Q1 when the first switching element Q1 is in the off state (S2: Yes) at the time when the zero crossing is detected The first switching element Q1 is switched to the on state (S3). Thereby, a sufficiently large control voltage is applied to the control terminal T1 of the bidirectional switch Q0, and the bidirectional switch Q0 is turned on.

In the example shown in FIG. 3, the control unit 1 detects the zero crossing of the voltage between the switches at time t0. After that, the control unit 1 switches the first switching element Q1 to the ON state at the time t1 when the first time has passed from the time t0. As an example, the first time is set in consideration of the difference between the point in time when the zero-crossing of the voltage between switches is detected and the point in time when the voltage between the switches is expected to actually zero-cross.

After that, when the time corresponding to the half cycle of the load voltage V1 elapses, the control unit 1 again detects the zero crossing of the voltage between the switches (S1). Then, the control unit 1 turns on the first switching element Q1 at the time when the zero crossing is detected (S2: No), so that the second control signal Sig2 is applied to the control terminal of the second switching element Q2, and the second The switching element Q2 is switched to the on state (S4). That is, as described above, the control unit 1 turns on the second switching element Q2 during the on period of the first switching element Q1.

Furthermore, the control unit 1 stops the operation of applying the first control signal Sig1 to the control terminal of the first switching element Q1 after switching the second switching element Q2 to the on state, thereby switching the first switching element Q1 to Cut off state (S5). After that, the second switching element Q2 is switched to the off state when the load voltage V1 is actually zero-crossed, that is, when the holding current flowing through the second switching element Q2 becomes zero (S6). That is, as described above, the control unit 1 cuts off the second switching element Q2 during the cutoff period of the first switching element Q1. Thereby, both the first switching element Q1 and the second switching element Q2 are turned off. In this state, the holding current flowing through the bidirectional switch Q0 becomes zero, so that the bidirectional switch Q0 is switched to the non-conductive state.

In the example shown in FIG. 3, the control unit 1 detects the zero crossing of the voltage between the switches at time t2. After that, the control unit 1 switches the second switching element Q2 to the ON state at the time t3 when the second time has passed from the time t2. In addition, the control unit 1 switches the second switching element Q2 to the OFF state at time t4 when the third time (>second time) has passed from time t2. As an example, the second time and the third time are set in consideration of the difference between the time when the voltage between the switches is zero-crossed and the time when the voltage between the switches is expected to be actually zero-crossed. Thereafter, at time t5, when the holding current flowing through the second switching element Q2 becomes zero, the second switching element Q2 is switched to the off state.

The control unit 1 repeats the processing of steps S1 to S6 described above to turn on the bidirectional switch Q0 intermittently. Thereby, the load 12 is driven by intermittently supplying electric power from the power source 11. As an example, when the load 12 is a light source, the control unit 1 lights up the light source by repeating the processing of steps S1 to S6 described above. Also, as an example, when the load 12 is a ventilation fan, the control unit 1 repeats the above-mentioned processing of steps S1 to S6 to drive the ventilation fan.

Hereinafter, when describing the advantages of the load control circuit 10 of this embodiment, first, the load control circuit of the first comparative example and the control circuit of the second comparative example will be described. The load control circuit of the first comparative example is different from the load control circuit 10 of this embodiment in that the load control circuit of the first comparative example does not include the first switching element and only controls the bidirectional switch by turning on/off of the second switching element. The control circuit of the first comparative example is basically used when an AC motor type ventilation fan is used as a load. In addition, the load control circuit of the second comparative example is different from the load control circuit 10 of this embodiment in that the load control circuit of the second comparative example does not include the second switching element and only controls the bidirectional switch by the on/off of the first switching element. Basically, the load control circuit of the second comparative example is used to load a light source with solid-state light-emitting elements, a DC motor-type ventilation fan, a ventilation fan with an electronic circuit mounted, or a ventilation fan with an electric switch as the load. Happening.

In the load control circuit of the first comparative example, the control unit switches the second switching element to the ON state by applying the second control signal to the control terminal of the second switching element. When the holding current flowing through the second switching element becomes zero, the second switching element is switched to the off state. In the load control circuit of the first comparative example, the holding current flowing through the second switching element may not become zero, and the second switching element may not be switched to the off state but maintain the on state. At this time, since the bidirectional switch is also maintained in the on state, for example, if the load is a light source, even though the light source must be turned off, the light source may still maintain the on state. Also, in the load control circuit of the first comparative example, if noise is superimposed on the output voltage of the power supply, the second switching element is repeatedly turned on/off, causing the bidirectional switch to be repeatedly turned on/off, and the load behavior appears Instability may occur.

In the load control circuit of the second comparative example, the control section switches the first switching element to the ON state by applying the first control signal to the control terminal of the first switching element. In addition, the control unit switches the first switching element to the OFF state by stopping the operation of applying the first control signal to the control terminal of the first switching element. In the load control circuit of the second comparative example, since the voltage-driven first switching element is used to control the bidirectional switch, the above-mentioned problems that may occur in the load control circuit of the first comparative example are not easily generated. However, in the load control circuit of the second comparative example, when an inductive load such as an AC motor type ventilation fan is used, the following problems may occur.

That is, in the load control circuit of the second comparative example, the control unit switches the first switching element to the off state in accordance with the point in time when the zero crossing of the voltage between the switches is detected. Therefore, the first switching element does not need to be switched to the off state at the point in time when the load voltage actually crosses zero. Then, at the time before and after the actual zero-crossing of the load voltage, that is, when the current is flowing through the load, if the first switching element is switched to the off state, the current flowing through the load will change rapidly. The inductance component may produce a reverse voltage (refer to Figure 5). In the example shown in Figure 5, "Q10" represents the on/off state of the first switching element of the load control circuit of the second comparative example, and "V10" represents the load applied to the load in the load control circuit of the second comparative example The waveform of the voltage. Due to the occurrence of this reverse voltage, the motor of the ventilation fan loses its balance when rotating, which may cause abnormal noises such as whining.

As described above, in the load control circuit of the first comparative example, the usable load is limited to an AC motor type ventilation fan, and it is difficult to use a light source with a solid-state light-emitting element or a DC motor type ventilation fan as the load. Furthermore, in the load control circuit of the second comparative example, the usable load is limited to a light source having a solid-state light-emitting element, a DC motor type ventilation fan, etc., and it is difficult to use an AC motor type ventilation fan as a load. In other words, in the load control circuit of the first comparative example and the load control circuit of the second comparative example, it is necessary to select a load that does not easily cause the above-mentioned problems, and there is a problem that the usable load is easily limited.

In addition, in the load control circuit 10 of this embodiment, the on/off of each of the voltage-driven first switching element Q1 and the self-holding second switching element Q2 is synchronized to control the bidirectional switch Q0, thereby solving the problem. The above problem. That is, in this embodiment, the control unit 1 basically uses the first switching element Q1 to control the bidirectional switch Q0, thereby making it difficult to cause problems that may occur in the load control circuit of the first comparative example described above. Then, in the present embodiment, the control unit 1 switches the second switching element Q2 to the on state in synchronization with the time point when the first switching element Q1 is switched to the off state, thereby enabling the control unit 1 The possible problems of the load control circuit are not easy to produce.

Specifically, in this embodiment, the control unit 1 switches the second switching element Q2 to the on state before switching the first switching element Q1 to the off state. That is, in the present embodiment, the second switching element Q2 is in the on state at the time when the first switching element Q1 is switched to the off state. Therefore, in the present embodiment, even at the time before and after the actual zero crossing of the load voltage V1, that is, in the state where the current is flowing through the load 12, even if the first switching element Q1 is switched to the off state, the load 12 The current will not change rapidly. Therefore, in the present embodiment, the inductance component included in the load 12 is unlikely to generate a reverse voltage (refer to FIG. 4). In the example shown in FIG. 4, "Q1" represents the on/off state of the first switching element Q1, "Q2" represents the on/off state of the second switching element Q2, and "V1" represents the waveform of the load voltage V1.

As described above, in this embodiment, it is possible to use a load 12 of a type that is difficult to use in the load control circuit of the first comparative example. Similarly, in this embodiment, a load 12 of a type that is difficult to use in the load control circuit of the second comparative example can be used. In other words, the present embodiment has the advantage that it is not easily restricted by the load 12 that can be used.

(4) Modifications The above-mentioned embodiment is only one of various embodiments of the present invention. If the above-mentioned embodiment achieves the purpose of the invention, various changes can be made in accordance with the design. In addition, the same function as the load control circuit 10 can be realized by a load control method, a (computer) program, or a temporary recording medium in which the program has been recorded, or the like.

One aspect of the load control method controls the bidirectional switch Q0 by synchronizing the on/off of each of the voltage-driven first switching element Q1 and the self-holding second switching element Q2. The bidirectional switch Q0 is electrically connected between the power source 11 and the load 12 to switch conduction/non-conduction between the power source 11 and the load 12. The first switching element Q1 and the second switching element Q2 are electrically connected in parallel to the control terminal T1 of the bidirectional switch Q0.

One aspect of the program is a program for making one or more processors execute the above-mentioned load control method.

Hereinafter, modified examples of the above-mentioned embodiment are listed. The modified examples described below can be appropriately combined and applied.

The load control circuit 10 of the present invention includes, for example, a computer system in the control unit 1 and the like. The computer system is mainly composed of a processor and memory as hardware. The function of the load control circuit 10 of the present invention is realized by making the processor execute the program recorded in the memory of the computer system. The program can be pre-recorded in the memory of the computer system, can be provided through the electrical communication loop, and can be recorded on a temporary recording medium such as a memory card, optical disk, and hard disk drive that can be read by the computer system. The processor of a computer system consists of one or more electronic circuits including semiconductor integrated circuits (IC) or large-scale integrated circuits (LSI). The integrated circuits such as IC or LSI mentioned here are called differently according to the degree of integration, including system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). . Furthermore, even if it is an FPGA (Field-Programmable Gate Array) that is programmed after the manufacture of the LSI, or the reconfiguration of the bonding relationship within the LSI, or the reconfiguration of the circuit partition within the LSI, it can be used as a logic device. processor. Multiple electronic circuits can be designed to be concentrated on one chip or scattered on multiple chips. Multiple wafers can also be designed to be concentrated in one device, or they can be designed to be scattered across multiple devices. The computer system mentioned here includes a microcontroller with more than one processor and more than one memory. Therefore, the microcontroller can also be composed of one or more electronic circuits including semiconductor integrated circuits or large-scale integrated circuits.

In addition, the concentration of at least a part of the functions of the load control circuit 10 in one frame is not an essential component of the load control circuit 10, and the components of the load control circuit 10 may be designed to be dispersed in a plurality of frames. Further, at least a part of the functions of the load control circuit 10, such as the functions of the control unit 1, are realized by the cloud (cloud computing) or the like.

In the above-mentioned embodiment, the power supply 11 may be a single-phase commercial power supply of 100 [V] and 50 [Hz]. In addition, the voltage value of the power supply 11 is not limited to 100 [V].

In the foregoing embodiment, the bidirectional switch Q0 is not limited to a bidirectional thyristor, and may be two MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistor) electrically connected in series between the connection terminal 101 and the connection terminal 102. The two MOSFETs are connected to each other through their source terminals, that is, connected in a so-called reverse series connection to switch the flow of current in both directions. In addition, the bidirectional switch Q0 may be, for example, a semiconductor element with a double gate (double gate) structure using a wide band gap semiconductor material such as GaN (gallium nitride).

In the above-mentioned embodiment, the first switching element Q1 may not be limited to an FET, and may be, for example, an IGBT (Insulated Gate Bipolar Transistor: insulated gate bipolar transistor).

In the above-mentioned embodiment, the control unit 1 does not need to be one circuit, and can be realized by two or more circuits. As an example, the control unit 1 may be composed of a circuit that controls the first switching element Q1 and a circuit that controls the second switching element Q2.

(to sum up) As described above, the load control circuit (10) of the first aspect includes: a bidirectional switch (Q0); a voltage-driven first switching element (Q1); a self-holding second switching element (Q2); and Control part (1). The bidirectional switch (Q0) is electrically connected between the power source (11) and the load (12) and switches the conduction/non-conduction between the power source (11) and the load (12). The first switching element (Q1) and the second switching element (Q2) are electrically connected in parallel to the control terminal (T1) of the bidirectional switch (Q0), and switch whether to supply drive from the power source (11) to the bidirectional switch (Q0) electricity. The control unit (1) synchronizes the on/off of each of the first switching element (Q1) and the second switching element (Q2), and controls the bidirectional switch (Q0).

According to this aspect, it has the advantage of not being easily restricted by the load (12) that can be used. In the load control circuit (10) of the second aspect, the second switching element (Q2) in the first aspect is a thyristor.

According to this aspect, there is an advantage that the second switching element (Q2) can be easily turned off when the load current flowing through the load (12) becomes zero.

In the load control circuit (10) of the third aspect, the first switching element (Q1) in the first or second aspect is a field effect transistor.

According to this aspect, there is an advantage that the ON state of the first switching element (Q1) can be easily maintained.

In the load control circuit (10) of the fourth aspect, the control unit (1) in any one of the first to third aspects turns on the second switching element (Q2) during the on period of the first switching element (Q1).

According to this aspect, the non-inductive time when both the first switching element (Q1) and the second switching element (Q2) are turned off will not occur, so the non-inductive time has an effect on the load (12) Advantages that are not easy to produce.

In the load control circuit (10) of the fifth aspect, the control unit (1) in any one of the first to fourth aspects makes the first half cycle of the load voltage (V1) applied to the load (12) 1 The switching element (Q1) is turned on.

According to this aspect, compared to the case where the first switching element (Q1) is turned on every 1 cycle of the load voltage (V1), there is an advantage that the accuracy of controlling the bidirectional switch (Q0) is easily improved.

In the load control circuit (10) of the sixth aspect, the control unit (1) in any one of the first to fifth aspects switches the second switching element (Q2) off during the off period of the first switching element (Q1) Off.

According to this aspect, there is an advantage that the second switching element (Q2) can be easily turned off at the time when the load voltage (V1) applied to the load (12) actually zero-crosses.

In the load control circuit (10) of the seventh aspect, the control section (1) in any one of the first to sixth aspects controls the first to sixth aspect based on the zero crossing of the load voltage (V1) applied to the load (12) 1 switching element (Q1).

According to this aspect, compared to the case where the first switching element (Q1) is turned on without being limited by the zero crossing of the load voltage (V1), there is an advantage that the accuracy of controlling the bidirectional switch (Q0) is easily improved.

In the load control circuit (10) of the eighth aspect, the load (12) in any one of the first to seventh aspects includes an inductive load.

According to this aspect, there is an advantage that the reverse voltage caused by the inductance component contained in the inductive load is not easily generated.

In the load control circuit (10) of the ninth aspect, the load (12) in any one of the first to eighth aspects includes: a light source having a solid-state light-emitting element; and a ventilation fan.

According to this aspect, it has the advantage of being able to use both a light source with a solid-state light-emitting element and a ventilation fan with one load control circuit (10).

The load control method of the tenth aspect controls the bidirectional switch (Q0) by synchronizing the on/off of each of the voltage-driven first switching element (Q1) and the self-holding second switching element (Q2). The bidirectional switch (Q0) is electrically connected between the power source (11) and the load (12) and switches the conduction/non-conduction between the power source (11) and the load (12). The first switching element (Q1) and the second switching element (Q2) are electrically connected in parallel to the control terminal (T1) of the bidirectional switch (Q0), and switch whether to supply drive from the power source (11) to the bidirectional switch (Q0) electricity.

According to this aspect, it has the advantage of not being easily restricted by the load (12) that can be used.

The program of the eleventh aspect is a program for making one or more processors execute the load control method of the tenth aspect.

According to this aspect, it has the advantage of not being easily restricted by the load (12) that can be used. The configurations of the second to ninth aspects are not necessary for the load control circuit (10) and can be omitted as appropriate.

1: Control Department 10: Load control circuit 11: Power 12: load 101, 102: connection terminals A1, A2: AC input terminal B1, B2: DC output terminal C1, C2, C3, C4: capacitor DB1: Rectifier L1: Inductor Q0: Two-way switch Q1: The first switching element Q2: The second switching element R1, R2, R3, R4, R5, R6: resistance Sig1: The first control signal Sig2: The second control signal T1: Control terminal V1: Load voltage VR1: Varistor

[Fig. 1] Fig. 1 is a schematic circuit diagram showing the configuration of a load control circuit according to an embodiment of the present invention. [Fig. 2] Fig. 2 is a flowchart showing an example of the operation of the load control circuit as above. [Fig. 3] Fig. 3 is an explanatory diagram of an operation example of the first switching element and the second switching element of the same load control circuit. [Fig. 4] Fig. 4 is an explanatory diagram of the operation of the same load control circuit. Fig. 5 is an explanatory diagram of the operation of the load control circuit of the second comparative example.

1: Control Department

10: Load control circuit

11: Power

12: load

101, 102: connection terminals

A1, A2: AC input terminal

B1, B2: DC output terminal

C1, C2, C3, C4: capacitor

DB1: Rectifier

L1: Inductor

Q0: Two-way switch

Q1: The first switching element

Q2: The second switching element

R1, R2, R3, R4, R5, R6: resistance

Sig1: The first control signal

Sig2: The second control signal

T1: Control terminal

V1: Load voltage

VR1: Varistor

Claims (11)

A load control circuit with: A bidirectional switch, which is electrically connected between the power supply and the load, and switches the conduction/non-conduction between the power supply and the load; The first switching element of the voltage driving type and the second switching element of the self-holding type are electrically connected in parallel to the control terminal of the bidirectional switch, and switch whether to supply driving power from the power source to the bidirectional switch; and The control unit synchronizes the on/off of each of the first switching element and the second switching element, and controls the two-way switch. Such as the load control circuit of claim 1, where The aforementioned second switching element is a thyristor. Such as the load control circuit of claim 1 or 2, where The aforementioned first switching element is a field effect transistor. Such as the load control circuit of claim 1 or 2, where The control unit turns on the second switching element during the on period of the first switching element. Such as the load control circuit of claim 1 or 2, where The control unit turns on the first switching element every half cycle of the load voltage applied to the load. Such as the load control circuit of claim 1 or 2, where The control unit cuts off the second switching element during the cutoff period of the first switching element. Such as the load control circuit of claim 1 or 2, where The control unit controls the first switching element based on the zero crossing of the load voltage applied to the load. Such as the load control circuit of claim 1 or 2, where The aforementioned load includes an inductive load. Such as the load control circuit of claim 1 or 2, where The aforementioned load includes: light source. It has a solid light emitting element; and a ventilation fan. A load control method, which is characterized by: Synchronize the on/off of each of the voltage-driven first switching element and the self-holding second switching element to control the bidirectional switch, wherein the voltage-driven first switching element and the self-holding second switching element 2 The switching element is electrically connected in parallel to the control terminal of the aforementioned two-way switch, and switches whether to supply driving power from the aforementioned power source to the aforementioned two-way switch, and the two-way switch is electrically connected between the power source and the load, and switches the aforementioned power source Conduction/non-conduction with the aforementioned load. A program characterized by: It is used to make one or more processors execute the load control method described in claim 10.

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