CN111384937A - Load control circuit, load control method, and storage medium - Google Patents
Load control circuit, load control method, and storage medium Download PDFInfo
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- CN111384937A CN111384937A CN201911381694.7A CN201911381694A CN111384937A CN 111384937 A CN111384937 A CN 111384937A CN 201911381694 A CN201911381694 A CN 201911381694A CN 111384937 A CN111384937 A CN 111384937A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
- H03K17/725—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region for ac voltages or currents
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/0009—AC switches, i.e. delivering AC power to a load
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Abstract
The invention provides a load control circuit, a load control method and a storage medium, which can prevent the limit of the usable load. A load control circuit (10) is provided with a bidirectional switch (Q0), a voltage-driven first switching element (Q1), a self-holding second switching element (Q2), and a control unit (1). A bidirectional switch (Q0) is electrically connected between the power source (11) and the load (12) and switches conduction/non-conduction between the power source (11) and the load (12). The first switch element (Q1) and the second switch element (Q2) are electrically connected in parallel to a control terminal of the bidirectional switch (Q0) and are used for switching whether or not drive power is supplied from the power supply (11) to the bidirectional switch (Q0). A control unit (1) controls a bidirectional switch (Q0) by synchronizing the on/off states of a first switching element (Q1) and a second switching element (Q2).
Description
Technical Field
The present disclosure relates generally to load control circuits, load control methods, and storage media. More particularly, the present disclosure relates to a load control circuit, a load control method, and a storage medium that control a load through a bidirectional switch.
Background
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 opening/closing unit, an operation switch, and a control unit. The main switching unit has a main switching element (triac) connected in series with the commercial power supply and the load, and controls power supply to the load. The operation switch is operated by a user and outputs at least a start signal for starting the load. The control unit is connected to the operation switch and controls the opening and closing of the main opening and closing unit in accordance with a signal transmitted from the operation switch.
Disclosure of Invention
Problems to be solved by the invention
An object of the present disclosure is to provide a load control circuit, a load control method, and a storage medium, in which a usable load is not easily limited.
Means for solving the problems
A load control circuit according to an aspect of the present disclosure includes a bidirectional switch, a voltage-driven first switching element, a self-holding second switching element, and a control unit. The bidirectional switch is electrically connected between a power supply and a load and used for switching conduction/non-conduction between the power supply and the load. The first switching element and the second switching element are electrically connected in parallel to a control terminal of the bidirectional switch, and are used for switching whether or not drive power is supplied from the power supply to the bidirectional switch. The control unit controls the bidirectional switch in synchronization with on/off of each of the first switching element and the second switching element.
In the load control method according to one aspect of the present disclosure, the bidirectional switch is controlled so that the on/off states of the first voltage-driven switching element and the second self-holding switching element are synchronized. The bidirectional switch is electrically connected between a power supply and a load and used for switching conduction/non-conduction between the power supply and the load. The first switching element and the second switching element are electrically connected in parallel to a control terminal of the bidirectional switch, and are used for switching whether or not drive power is supplied from the power supply to the bidirectional switch.
A storage medium according to an aspect of the present disclosure is a non-transitory computer-readable storage medium storing a program for causing 1 or more processors to execute the load control method.
ADVANTAGEOUS EFFECTS OF INVENTION
The present disclosure has an advantage that a load that can be used is not easily limited.
Drawings
Fig. 1 is a schematic circuit diagram showing a configuration of a load control circuit according to an embodiment of the present disclosure.
Fig. 2 is a flowchart showing an example of the operation of the load control circuit.
Fig. 3 is an explanatory diagram of an operation example of the first switching element and the second switching element of the load control circuit.
Fig. 4 is an explanatory diagram of the operation of the load control circuit.
Fig. 5 is an explanatory diagram of an operation of the load control circuit of the second comparative example.
Description of the reference numerals
1: a control unit; 10: a load control circuit; 11: a power source; 12: a load; q0: a bi-directional switch; q1: a first switching element; q2: a second switching element; t1: a control terminal; v1: the load voltage.
Detailed Description
(1) Summary of the invention
As shown in fig. 1, the load control circuit 10 according to the present embodiment is electrically connected between a power source 11 and a load 12, and switches a state of current flow from the power source 11 to the load 12. The power source 11 is, for example, a single-phase 100[ V ] or 60[ Hz ] commercial power source. The load 12 may include, for example, a ventilation fan or a Light source having a solid-state Light Emitting element such as an LED (Light Emitting Diode). The ventilation fan may include an AC motor type ventilation fan, a DC motor type ventilation fan, a ventilation fan with an electronic circuit mounted thereon, a ventilation fan with an electric louver, or the like. That is, the load 12 can comprise an inductive load.
The load control circuit 10 is housed in a case of a switch mounted on a wall of a house, for example. As an example, the switch includes a switch having a timer function of switching the state of current supply from the power source 11 to the load 12 according to a set time. In addition, the switch includes, for example, a switch that switches the state of current supplied from the power supply 11 to the load 12 in accordance with the detection result of the human detection sensor or the brightness sensor. The switches described above also have a function of switching the state of current flow from power supply 11 to load 12 upon receiving an operation from a user.
The load control circuit 10 includes a bidirectional switch Q0, a voltage-driven first switching element Q1, a self-holding second switching element Q2, and a controller 1. The bidirectional switch Q0 is electrically connected between the power source 11 and the load 12, and switches conduction/non-conduction between the power source 11 and the load 12.
Here, 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. Thus, if the bidirectional switch Q0 is in the on state, conduction between the connection terminal 101 and the connection terminal 102 is made via the bidirectional switch Q0. In addition, if the bidirectional switch Q0 is in the off state, the connection terminal 101 and the connection terminal 102 are non-conductive. That is, if the bidirectional switch Q0 is turned on, conduction is established between the power source 11 and the load 12, and power is supplied from the power source 11 to the load 12. In the present embodiment, the on state of the bidirectional switch Q0 includes not only a state in which the bidirectional switch Q0 is continuously turned on, but also a state in which the bidirectional switch Q0 is intermittently turned on. That is, the on state of the bidirectional switch Q0 is a state in which power supply from the power source 11 to the load 12 is performed, and the off state of the bidirectional switch Q0 is a state in which power supply from the power source 11 to the load 12 is cut off.
The first switching element Q1 is a voltage-driven type switch, that is, a switch that switches on/off according to the magnitude of a voltage applied to a control terminal of the first switching element Q1. In the present embodiment, the first switching element Q1 is a FET (Field Effect Transistor). The second switching element Q2 is a self-holding switch, that is, a switch that once turned on maintains the on state until the holding current becomes zero. In the present 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 bi-directional switch Q0. As described later, the first switching element Q1 and the second switching element Q2 are switches for switching whether or not the drive power is supplied from the power source 11 to the bidirectional switch Q0. The "drive power" referred to in the present disclosure is power (voltage) supplied to the control terminal T1 of the bidirectional switch Q0 to turn on the bidirectional switch Q0.
The control section 1 controls the bidirectional switch Q0 by synchronizing on/off of each of the first switching element Q1 and the second switching element Q2. Specifically, the controller 1 controls on/off of each of the first switching element Q1 and the second switching element Q2 with reference to the timing at which the zero crossing of the load voltage V1 applied from the power supply 11 to the load 12 is detected.
As described above, in the present embodiment, the bidirectional switch Q0 is controlled using both the voltage-driven first switching element Q1 and the self-holding second switching element Q2. Therefore, in the present embodiment, it is possible to use a load 12 of a type that is difficult to use when the bidirectional switch Q0 is controlled using only the first switching element Q1. Similarly, in the present embodiment, it is possible to use a load 12 of a type that is difficult to use when the bidirectional switch Q0 is controlled using only the second switching element Q2. That is, the present embodiment has an advantage that the load 12 that can be used is not easily restricted.
(2) Detailed description of the invention
Next, the configuration of the load control circuit 10 according to the present 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. It is assumed that the load 12 connected to the load control circuit 10 on the lower surface is the above-described ventilation fan or a light source having a solid-state light emitting element.
As described above, the load control circuit 10 includes the 2 connection terminals 101 and 102, the bidirectional switch Q0, the first switching element Q1, the second switching element Q2, and the control unit 1. Each of the 2 connection terminals 101 and 102 is a member for electrically and mechanically connecting wires. These 2 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 1 case. The "terminal" such as the "connection terminal" in the present embodiment may not be a member (terminal) for connecting a power supply line, and may be, for example, a lead wire of an electronic component or a part of a conductor included in a circuit board.
A parallel circuit of a capacitor C1 and a varistor VR1 is electrically connected between the 2 connection terminals 101 and 102. Further, 1 connection terminal 101 out of the 2 connection terminals 101 and 102 is electrically connected to 1 ac input terminal a1 out of the pair of ac input terminals a1 and a2 of the rectifier DB1 via the inductor L1.
The rectifier DB1 is formed of a diode bridge, and has a pair of ac input terminals a1 and a2 and a pair of dc output terminals B1 and B2. The rectifier DB1 full-wave rectifies a voltage applied across the bidirectional switch Q0 (hereinafter also referred to as an "inter-switch voltage"), and 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 conduction/non-conduction between the power source 11 and the load 12. In the present embodiment, the bidirectional switch Q0 is composed of a 3-terminal triac (bidirectional thyristor). The bidirectional switch Q0 is electrically connected between the connection terminal 101 and the connection terminal 102, and switches the passage/interruption of a bidirectional current between the connection terminal 101 and the connection terminal 102. A control terminal T1 (gate terminal) of the bidirectional switch Q0 is electrically connected to 1 ac input terminal a2 of the pair of ac input terminals a1 and a2 of the rectifier DB 1.
In addition, the control terminal T1 of the bidirectional switch Q0 is electrically connected to the connection terminal 102 via a circuit including resistors R1, R2, and a capacitor C2. The connection point of the resistors R1 and R2 is electrically connected to 1 ac input terminal a2 of the ac input terminals a1 and a2 of the rectifier DB 1. The connection point of the capacitor C2 and the resistor R1 is electrically connected to the control terminal T1 of the bidirectional switch Q0. Further, 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 high-potential-side dc output terminal B1 of the pair of dc output terminals B1 and B2 of the rectifier DB1 via the 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 DB 1. In the present embodiment, the first switching element Q1 is formed of an enhancement-mode 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 high-potential-side dc output terminal B1 of the rectifier DB1 via a resistor R6. The source terminal of the first switching element Q1 is electrically connected to the low-potential-side dc output terminal B2 (ground) of the rectifier DB 1. The gate terminal of the first switching element Q1 is electrically connected to the control section 1 via a parallel circuit of a resistor R3 and a capacitor C3. Then, the first control signal Sig1 as a voltage signal is input from the control unit 1 to the gate terminal of the first switching element Q1, whereby conduction/non-conduction between the pair of dc output terminals B1 and B2 of the rectifier DB1 is switched.
The second switching element Q2 is electrically connected to the high-potential-side dc output terminal B1 of the pair of dc output terminals B1 and B2 of the rectifier DB1 via the 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 DB 1. In the present embodiment, the second switching element Q2 is formed of a thyristor (reverse blocking triac).
An anode of the second switching element Q2 is electrically connected to a high-potential-side dc output terminal B1 of the rectifier DB1 via a resistor R5. The cathode of the second switching element Q2 is electrically connected to the low-potential-side dc output terminal B2 (ground) of the rectifier DB 1. The gate of the second switching element Q2 is electrically connected to the control section 1 via a parallel circuit of a resistor R4 and a capacitor C4. Then, the second control signal Sig2 as a current signal is input from the controller 1 to the gate of the second switching element Q2, whereby conduction/non-conduction between the pair of dc output terminals B1 and B2 of the rectifier DB1 is switched.
Here, if the first switching element Q1 and the second switching element Q2 are non-conductive, 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 maintains a non-conductive state. On the other hand, if at least one of the first switching element Q1 and the second switching element Q2 is turned on, a current flows through the rectifier DB1, whereby 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. 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 are used to switch whether or not the drive power is supplied from the power source 11 to the bidirectional switch Q0. Further, the bidirectional switch Q0 is a self-holding type switch, and therefore, if the load voltage V1 applied to the load 12 makes a zero crossing, that is, the holding current flowing through the bidirectional switch Q0 becomes zero, the bidirectional switch Q0 switches to a non-conductive state.
For example, the control unit 1 is a main structure of a computer system having 1 or more processors and 1 or more memories. The processor realizes the function of the control unit 1 by executing a program recorded in the memory. The program may be recorded in advance in the memory, may be provided by being recorded in a non-transitory recording medium such as a memory card, or may be provided through an electric communication line.
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 controller 1 outputs the first control signal Sig1 to the control terminal (gate terminal) of the first switching element Q1, thereby switching the conduction/non-conduction of the first switching element Q1. The controller 1 outputs a second control signal Sig2 to the control terminal (gate) of the second switching element Q2 to switch the second switching element Q2 between on and off states. 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 a non-conductive state and the holding current flowing through the bidirectional switch Q0 becomes zero, the bidirectional switch Q0 switches to the non-conductive state.
When receiving an on control instruction by a user operation or reaching a time set in advance by the user, the control unit 1 performs control to switch the bidirectional switch Q0 to the on state. Thereby, power is supplied from power supply 11 to load 12 to drive load 12.
Here, the control unit 1 monitors the zero crossing of the inter-switch voltage (indirectly, the load voltage V1 applied to the load 12) by monitoring the magnitude of the voltage (inter-switch voltage) applied between both ends of the bidirectional 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, 12V) to detect the zero crossing of the inter-switch voltage when the connection terminal 101 of the connection terminals 101 and 102 is at the high potential. Further, the control unit 1 compares the magnitude of the voltage between the connection terminal 102 and the ground with a reference value to detect a zero crossing when the connection terminal 102 of the connection terminals 101 and 102 is at a high potential. Further, there is a possibility that a slight deviation may occur between the timing of the zero crossing detected by the control unit 1 and the timing of the zero crossing in a strict sense (the timing at which the load voltage V1 becomes 0[ V ]).
Then, the controller 1 turns on/off the first switching element Q1 every time a zero crossing of the inter-switch voltage (indirectly, the load voltage V1 applied to the load 12) is detected. That is, in the present embodiment, controller 1 controls first switching element Q1 based on the zero crossing of load voltage V1 applied to load 12. In the present embodiment, controller 1 turns on first switching element Q1 every half cycle of load voltage V1 applied to load 12.
Here, when detecting the zero crossing of the inter-switching voltage when the first switching element Q1 is in the on state, the controller 1 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 controller 1 turns on the second switching element Q2 during the on period of the first switching element Q1. Further, since the second switching element Q2 is a self-holding type 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 second switching element Q2 is switched to the off state. The timing at which the second switching element Q2 switches to the off state is the off period of the first switching element Q1. That is, the controller 1 adjusts the timing of turning on the second switching element Q2 to turn off the second switching element Q2 during the off period of the first switching element Q1.
In this manner, the controller 1 controls on/off of each of the first switching element Q1 and the second switching element Q2 with reference to the timing at which the zero crossing of the load voltage V1 applied from the power supply 11 to the load 12 is detected. Then, the conduction/non-conduction of the bidirectional switch Q0 is switched according to the on/off of each of the first switching element Q1 and the second switching element Q2. That is, the control section 1 controls the bidirectional switch Q0 by synchronizing on/off of each of the first switching element Q1 and the second switching element Q2.
(3) Movement of
Next, the operation of the load control circuit 10 according to the present embodiment will be described with reference to fig. 2 and 3. Next, it is assumed that control unit 1 receives an on control instruction by a user operation, and performs control to turn on bidirectional switch Q0. In addition, "Q1" and "Q2" in fig. 3 indicate states of on/off of the first switching element Q1 and on/off of the second switching element Q2, respectively.
First, the control unit 1 continuously monitors the magnitude of the inter-switch voltage. Then, the control unit 1 detects a zero crossing of the inter-switch voltage (indirectly, the load voltage V1) (S1). Then, if the first switching element Q1 is in the off state at the time point when the zero crossing is detected (S2: yes), the control section 1 switches the first switching element Q1 to the on state by supplying the first control signal Sig1 to the control terminal of the first switching element Q1 (S3). Thus, 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, control unit 1 detects a zero crossing of the inter-switch voltage at time t 0. Thereafter, the controller 1 switches the first switching element Q1 to the on state at a time point when the first time has elapsed since the time point t0, that is, at a time point t 1. For example, the first time is set in consideration of a difference between a timing at which a zero crossing of the inter-switch voltage is detected and a timing at which the zero crossing of the inter-switch voltage is assumed to be actually performed.
After that, when the time corresponding to the half cycle of the load voltage V1 has elapsed, the control unit 1 detects the zero crossing of the inter-switch voltage again (S1). Further, since the first switching element Q1 is in the on state at the time point when the zero crossing is detected (S2: no), the control section 1 switches the second switching element Q2 to the on state by supplying the second control signal Sig2 to the control terminal of the second switching element Q2 (S4). That is, as described above, the controller 1 turns on the second switching element Q2 during the on period of the first switching element Q1.
In addition, after switching the second switching element Q2 to the on state, the controller 1 stops supplying the first control signal Sig1 to the control terminal of the first switching element Q1, thereby switching the first switching element Q1 to the off state (S5). Thereafter, when the load voltage V1 actually makes a zero crossing, that is, the holding current flowing through the second switching element Q2 becomes zero, the second switching element Q2 is switched to the off state (S6). That is, as described above, the controller 1 turns off the second switching element Q2 during the off 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, and the bidirectional switch Q0 is switched to a non-conductive state.
In the example shown in fig. 3, control unit 1 detects a zero crossing of the inter-switch voltage at time t 2. Thereafter, the controller 1 switches the second switching element Q2 to the on state at a time point when the second time elapses from the time point t2, i.e., at a time point t 3. Further, the control unit 1 switches the second switching element Q2 to the off state at a time point t4, which is a time point when the third time (> second time) has elapsed from the time point t 2. For example, the second time and the third time are both set in consideration of a difference between a timing at which a zero crossing of the inter-switch voltage is detected and a timing at which the zero crossing of the inter-switch voltage is assumed to be actually performed. Thereafter, at time t5, the holding current flowing through the second switching element Q2 becomes zero, whereby 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, thereby intermittently turning on the bidirectional switch Q0. Thereby, the load 12 is driven by intermittently supplying power from the power source 11. For example, when the load 12 is a light source, the controller 1 repeatedly performs the above-described processes of steps S1 to S6 to turn on the light source. In addition, for example, when the load 12 is a ventilation fan, the control unit 1 drives the ventilation fan by repeating the processing of steps S1 to S6.
Next, in order to explain the advantages of the load control circuit 10 of the present embodiment, first, a load control circuit of the first comparative example and a control circuit of the second comparative example are explained. The load control circuit of the first comparative example is different from the load control circuit 10 of the present embodiment in that: the bidirectional switch is controlled only by turning on/off the second switching element without providing the first switching element. The control circuit of the first comparative example is basically used in the case where an AC motor type ventilation fan is used as a load. The load control circuit of the second comparative example is different from the load control circuit 10 of the present embodiment in that: the bidirectional switch is controlled only by turning on/off the first switching element without providing the second switching element. The load control circuit of the second comparative example is basically used when a light source having a solid-state light emitting element, a DC motor type ventilation fan, a ventilation fan having an electronic circuit mounted thereon, or a ventilation fan having an electric louver is used as a load.
In the load control circuit of the first comparative example, the control unit switches the second switching element to the on state by supplying 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 an off state. The following may occur in the load control circuit of the first comparative example: the holding current flowing through the second switching element does not become zero, so that the second switching element does not switch to the off state and maintains the on state. In this case, since the bidirectional switch is also maintained in the on state, if the load is a light source, for example, there is a problem that the light source is maintained in the on state even though the light source must be turned off. In addition, the following may occur in the load control circuit of the first comparative example: when noise is superimposed on the output voltage of the power supply, the second switching element is repeatedly turned on and off, and thus the bidirectional switch is also repeatedly turned on and off, and the operation of the load becomes unstable.
In the load control circuit of the second comparative example, the control unit switches the first switching element to the on state by supplying the first control signal to the control terminal of the first switching element. The control unit switches the first switching element to the off state by stopping the supply of 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 bidirectional switch is controlled using the voltage-driven first switching element, the above-described problem that may occur in the load control circuit of the first comparative example is unlikely to occur. 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 based on the timing at which the zero crossing of the inter-switching voltage is detected. Therefore, the first switching element does not have to be switched to the off state at the timing when the load voltage actually makes a zero crossing. When the first switching element is switched to the off state at a timing before and after the load voltage actually crosses zero, that is, in a state where a current flows through the load, the current flowing through the load changes rapidly, and there is a possibility that a back electromotive voltage is generated due to an inductance component included in the load (see fig. 5). In the example shown in fig. 5, "Q10" represents the on/off state of the first switching element in the load control circuit of the second comparative example, and "V10" represents the waveform of the load voltage applied to the load in the load control circuit of the second comparative example. The generation of the counter electromotive voltage may break the rotational balance of the motor of the ventilation fan, thereby generating an abnormal noise such as a whining sound.
As described above, in the load control circuit of the first comparative example, the loads that can be used are limited to the AC motor type ventilation fan, and it is difficult to use a light source having a solid-state light emitting element, a DC motor type ventilation fan, or the like as the load. In the load control circuit of the second comparative example, the loads that can be used are limited to a light source having a solid-state light emitting element, a DC motor type ventilation fan, and the like, and it is difficult to use an AC motor type ventilation fan as a load. That is, in both 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 is less likely to cause the above-described problem, and there is a problem that the usable load is likely to be limited.
On the other hand, in the load control circuit 10 of the present embodiment, the bidirectional switch Q0 is controlled by synchronizing on/off of each of the voltage-driven first switching element Q1 and the self-holding second switching element Q2, thereby solving the above-described problem. That is, in the present embodiment, the controller 1 basically controls the bidirectional switch Q0 using the first switching element Q1, and thus the above-described problem that may occur in the load control circuit of the first comparative example is unlikely to occur. In the present embodiment, the controller 1 switches the second switching element Q2 to the on state in synchronization with the timing of switching the first switching element Q1 to the off state, so that the above-described problem that may occur in the load control circuit of the second comparative example is unlikely to occur.
Specifically, in the present embodiment, the controller 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 timing when the first switching element Q1 is switched to the off state. Therefore, in the present embodiment, even when first switching element Q1 is switched to the off state at the timing before and after the load voltage V1 actually crosses zero, that is, in a state where a current flows through load 12, the current flowing through load 12 does not change rapidly. Therefore, in the present embodiment, a back electromotive voltage is less likely to be generated by an inductance component included in the load 12 (see 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 the present embodiment, the load 12 of a type that is difficult to use in the load control circuit of the first comparative example can be used. Similarly, in the present embodiment, the load 12 of a type that is difficult to use in the load control circuit of the second comparative example can be used. That is, the present embodiment has an advantage that the load 12 that can be used is not easily restricted.
(4) Modification example
The above-described embodiment is only one of various embodiments of the present disclosure. The above-described embodiment can be variously modified in accordance with design and the like as long as the object of the present disclosure can be achieved. The same functions as those of the load control circuit 10 may be embodied by a load control method, a (computer) program, a non-transitory recording medium on which a program is recorded, or the like.
In the load control method according to one embodiment, the bidirectional switch Q0 is controlled by synchronizing 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 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 bi-directional switch Q0.
A storage medium according to one embodiment is a non-transitory computer-readable storage medium storing a program for causing 1 or more processors to execute the load control method.
Next, modifications of the above embodiment will be described. The modifications described below can be applied in appropriate combinations.
The load control circuit 10 of the present disclosure includes a computer system in the control section 1 or the like, for example. The computer system is mainly structured by a processor and a memory as hardware. The function as the load control circuit 10 in the present disclosure is realized by executing a program recorded in a memory of a computer system by a processor. The program may be recorded in advance in a memory of the computer system, may be provided via 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 that can be read by the computer system. A processor of a computer system is constituted by 1 or more electronic circuits including a semiconductor Integrated Circuit (IC) or a large scale integrated circuit (LSI). The term "integrated circuit" as used herein, such as an IC or an LSI, may be referred to as a system LSI, a VLSI (Very Large Scale Integration) or an ULSI (Ultra Large Scale Integration) integrated circuit, depending on the degree of Integration. An FPGA (Field-Programmable Gate Array) programmed after LSI manufacture or a logic device capable of reconstructing a bonding relationship or a circuit partition in the LSI can be used as the processor. The plurality of electronic circuits may be collected in 1 chip, or may be provided in a plurality of chips in a dispersed manner. The plurality of chips may be collected in 1 device, or may be provided in a plurality of devices in a distributed manner. A computer system as referred to herein includes a microcontroller having more than 1 processor and more than 1 memory. Thus, the microcontroller is also constituted by 1 or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.
It is not essential for the load control circuit 10 that at least a part of the functions of the load control circuit 10 be integrated in 1 housing, and the components of the load control circuit 10 may be provided in a plurality of housings in a distributed manner. At least a part of the functions of the load control circuit 10, for example, the functions of the control unit 1, may be realized by cloud (cloud computing) or the like.
In the above embodiment, the power source 11 may be a single-phase 100[ VHz ], 50[ Hz ] commercial power source. In addition, the voltage value of the power source 11 is not limited to 100[ V ].
In the above-described embodiment, the bidirectional switch Q0 is not limited to the triac, and may be 2 MOSFETs (Metal-Oxide-Semiconductor Field-effect transistors) electrically connected in series between the connection terminal 101 and the connection terminal 102. The 2 MOSFETs are connected to each other at their source terminals, i.e., connected in series in opposite directions, to switch the current flow in/out in both directions. The bidirectional switch Q0 may be a semiconductor element of a double-gate (double-gate) structure using a semiconductor material having a wide band gap such as GaN (gallium nitride), for example.
In the above-described embodiment, the first switching element Q1 is not limited to the FET, and may be, for example, an IGBT (insulated gate Bipolar Transistor).
In the above-described embodiment, the control unit 1 does not need to have 1 circuit, but may be implemented by 2 or more circuits. For example, the controller 1 may be configured by a circuit for controlling the first switching element Q1 and a circuit for controlling the second switching element Q2.
(conclusion)
As described above, the load control circuit (10) according to the first aspect includes the bidirectional switch (Q0), the voltage-driven first switching element (Q1), the self-holding second switching element (Q2), and the control unit (1). A bidirectional switch (Q0) is electrically connected between the power source (11) and the load (12) and switches 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 a control terminal (T1) of the bidirectional switch (Q0) and are used for switching whether or not drive power is supplied from the power supply (11) to the bidirectional switch (Q0). A control unit (1) controls a bidirectional switch (Q0) by synchronizing the on/off states of a first switching element (Q1) and a second switching element (Q2).
According to this mode, there is an advantage that the load (12) that can be used is not easily restricted.
In a load control circuit (10) according to a second aspect, in the first aspect, the second switching element (Q2) is a thyristor.
According to this mode, there is an advantage that the second switching element (Q2) is easily turned off when the load current flowing through the load (12) becomes zero.
In the load control circuit (10) according to the third aspect, in the first or second aspect, the first switching element (Q1) is a field effect transistor.
This configuration has an advantage that the on state of the first switching element (Q1) is easily maintained.
In a load control circuit (10) according to a fourth aspect, in any one of the first to third aspects, the control unit (1) turns on the second switching element (Q2) during the on period of the first switching element (Q1).
According to this aspect, since the dead time in which both the first switching element (Q1) and the second switching element (Q2) are off does not occur, there is an advantage in that the influence of the dead time on the load (12) is not easily generated.
In a load control circuit (10) according to a fifth aspect, in any one of the first to fourth aspects, the control unit (1) turns on the first switching element (Q1) every half cycle of a load voltage (V1) applied to the load (12).
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 a load control circuit (10) according to a sixth aspect, in any one of the first to fifth aspects, the control unit (1) turns off the second switching element (Q2) during the off period of the first switching element (Q1).
According to this method, there is an advantage that the second switching element (Q2) is easily turned off at the timing when the load voltage (V1) applied to the load (12) actually crosses zero.
In a load control circuit (10) according to a seventh aspect, in any one of the first to sixth aspects, a control unit (1) controls a first switching element (Q1) based on a zero crossing of a load voltage (V1) applied to a load (12).
According to this embodiment, compared to the case where the first switching element Q1 is turned on without depending on 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 a load control circuit (10) according to an eighth aspect, in any one of the first to seventh aspects, the load (12) includes an inductive load.
According to this aspect, there is an advantage that a back electromotive voltage due to an inductance component included in the inductive load is not easily generated.
In a load control circuit (10) according to a ninth aspect, in any one of the first to eighth aspects, the load (12) includes a ventilation fan and a light source having a solid-state light-emitting element.
According to this aspect, both the ventilation fan and the light source having the solid-state light-emitting element can be used for 1 load control circuit (10).
In a load control method according to a tenth aspect, a bidirectional switch (Q0) is controlled by synchronizing on/off of a first voltage-driven switching element (Q1) and a second self-holding switching element (Q2). A bidirectional switch (Q0) is electrically connected between the power source (11) and the load (12) and switches 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 a control terminal (T1) of the bidirectional switch (Q0) and are used for switching whether or not drive power is supplied from the power supply (11) to the bidirectional switch (Q0).
According to this mode, there is an advantage that the load (12) that can be used is not easily restricted.
A storage medium according to an eleventh aspect is a computer-readable non-transitory storage medium storing a program for causing 1 or more processors to execute the load control method according to the tenth aspect.
According to this mode, there is an advantage that the load (12) that can be used is not easily restricted.
The configurations according to the second to ninth aspects are not essential to the load control circuit 10 and can be omitted as appropriate.
Claims (11)
1. A load control circuit is provided with:
a bidirectional switch electrically connected between a power source and a load for switching conduction/non-conduction between the power source and the load;
a first switching element of a voltage-driven type and a second switching element of a self-holding type, the first switching element and the second switching element being electrically connected in parallel to a control terminal of the bidirectional switch, for switching whether or not drive power is supplied from the power supply to the bidirectional switch; and
and a control unit that controls the bidirectional switch in synchronization with on/off of each of the first switching element and the second switching element.
2. The load control circuit of claim 1,
the second switching element is a thyristor.
3. The load control circuit according to claim 1 or 2,
the first switching element is a field effect transistor.
4. The load control circuit according to claim 1 or 2,
the control unit turns on the second switching element during turning on of the first switching element.
5. The load control circuit according to claim 1 or 2,
the control unit turns on the first switching element every half cycle of a load voltage applied to the load.
6. The load control circuit according to claim 1 or 2,
the control section turns off the second switching element during turning off of the first switching element.
7. The load control circuit according to claim 1 or 2,
the control section controls the first switching element based on a zero crossing of a load voltage applied to the load.
8. The load control circuit according to claim 1 or 2,
the load comprises an inductive load.
9. The load control circuit according to claim 1 or 2,
the load includes a ventilation fan and a light source having a solid light emitting element.
10. A method for controlling a load in a load control system,
a bidirectional switch is controlled by synchronizing on/off of a first switch element of a voltage drive type and a second switch element of a self-hold type, the bidirectional switch being electrically connected between a power source and a load for switching conduction/non-conduction between the power source and the load, the first switch element and the second switch element being electrically connected in parallel to a control terminal of the bidirectional switch for switching whether or not drive power is supplied from the power source to the bidirectional switch.
11. A storage medium, which is a non-transitory storage medium readable by a computer,
a program for causing 1 or more processors to execute the load control method according to claim 10 is stored.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018246278A JP7300636B2 (en) | 2018-12-27 | 2018-12-27 | LOAD CONTROL CIRCUIT, LOAD CONTROL METHOD, AND PROGRAM |
| JP2018-246278 | 2018-12-27 |
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| Publication Number | Publication Date |
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| CN111384937A true CN111384937A (en) | 2020-07-07 |
| CN111384937B CN111384937B (en) | 2023-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911381694.7A Active CN111384937B (en) | 2018-12-27 | 2019-12-27 | Load control circuit, load control method, and storage medium |
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| Country | Link |
|---|---|
| JP (1) | JP7300636B2 (en) |
| CN (1) | CN111384937B (en) |
| TW (1) | TWI741463B (en) |
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| CN1244311A (en) * | 1996-11-07 | 2000-02-09 | 许益宗 | Apparatus for controlling AC supply switches |
| JP2007174409A (en) * | 2005-12-22 | 2007-07-05 | Matsushita Electric Works Ltd | Two-wire electronic switch |
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| JP4367269B2 (en) * | 2004-07-16 | 2009-11-18 | パナソニック電工株式会社 | switch |
| US8779680B2 (en) * | 2006-11-26 | 2014-07-15 | Tritonics Technologies Ltd | Enabling simultaneous dimming and power supply operations within a dimmer assembly through a single pair of electrical wires |
| JP5358350B2 (en) | 2009-08-26 | 2013-12-04 | パナソニック株式会社 | Load control device |
| JP6103478B2 (en) * | 2013-03-22 | 2017-03-29 | 東芝ライテック株式会社 | Power supply circuit and lighting device |
| EP2901483B1 (en) * | 2013-06-24 | 2016-09-07 | Ideal Power Inc. | Systems, circuits, devices, and methods with bidirectional bipolar transistors |
| JP6751908B2 (en) * | 2016-03-25 | 2020-09-09 | パナソニックＩｐマネジメント株式会社 | Electronic switch device and electronic switch system |
| JP6653452B2 (en) * | 2016-09-20 | 2020-02-26 | パナソニックＩｐマネジメント株式会社 | Protection circuit for dimmer and dimmer |
| JP6830204B2 (en) * | 2016-12-27 | 2021-02-17 | パナソニックＩｐマネジメント株式会社 | Load control device |
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2018
- 2018-12-27 JP JP2018246278A patent/JP7300636B2/en active Active
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| CN1244311A (en) * | 1996-11-07 | 2000-02-09 | 许益宗 | Apparatus for controlling AC supply switches |
| JP2007174409A (en) * | 2005-12-22 | 2007-07-05 | Matsushita Electric Works Ltd | Two-wire electronic switch |
| JP2014072917A (en) * | 2012-09-27 | 2014-04-21 | Taiyo Yuden Co Ltd | Bidirectional dc-dc converter |
| JP2017163681A (en) * | 2016-03-09 | 2017-09-14 | 富士電機株式会社 | Drive circuit for voltage-driven semiconductor switch element |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2020108040A (en) | 2020-07-09 |
| CN111384937B (en) | 2023-08-15 |
| TW202027396A (en) | 2020-07-16 |
| TWI741463B (en) | 2021-10-01 |
| JP7300636B2 (en) | 2023-06-30 |
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