TWI733469B - Load control device, load control method and program - Google Patents

Abstract

The object of the present invention is to provide a load control device that can prevent the power supply voltage supplied from the output voltage of the buffer unit from falling below a predetermined voltage. The load control device (1) includes: a switch unit (2); a switch control unit (4); a rectifier circuit (10); a wireless unit (5); a buffer unit (14); and a control unit (17). The switch part (2) conducts and cuts off the AC power supply (B1) and the load (Q1). The switch control part (4) controls the switch part (2). The rectifier circuit (10) converts the AC power supplied from the AC power supply (B1) into DC power. The wireless unit (5) operates using DC power converted by the rectifier circuit (10). The buffer unit (14) is charged in a dischargeable manner by the DC power converted by the rectifier circuit (10), and then the stored power can be discharged to the wireless unit (5) and the switch control unit (4) as The aforementioned DC power. The control unit (17) controls the wireless unit (5) based on the output voltage (V4) of the buffer unit (14).

Description

Load control device, load control method and program

The present invention generally relates to a load control device, a load control method, and a program, and more specifically, relates to a load control device, a load control method, and a program that control power supply from an AC power source to a load.

Document 1 (Patent No. 4620773) discloses a two-wire dimming device (load control device) that controls the lighting load. The two-wire dimming device is equipped with: 2 FETs, which open and close the power supply path from the AC power supply to the lighting load; a diode (conversion unit), which generates DC power from the AC power supplied by the AC power supply; and a capacitor (buffer unit) ), which smoothes the aforementioned DC power; and a control circuit, which operates by the DC power smoothed by a capacitor, and then controls the FET to turn on and off. In this two-wire dimming device, the power supply voltage is supplied by the output voltage of the capacitor.

In the above-mentioned two-wire dimming device, if the power supply voltage supplied by the output voltage of the capacitor is lower than a predetermined voltage, the control circuit may be reset. If the control circuit is reset, the control circuit becomes unusable until the control circuit restarts, and the load control device becomes unusable.

[The problem to be solved by the invention]

In view of the above reasons, an object of the present invention is to provide a load control device, load control method, and program that can prevent the power supply voltage supplied by the output voltage of the buffer from falling below a predetermined voltage. [Means used to solve the problem]

The load control device in one aspect of the present invention includes: a switch unit; a switch control unit; a conversion unit; an additional function unit; a buffer unit; and a control unit. The switch unit conducts and disconnects the AC power source and the load, thereby controlling the supply of electric power from the AC power source to the load, and causes the load to operate and stop. The switch control unit controls the switch unit. The conversion unit converts AC power supplied from the AC power source into DC power. The additional function unit is operated using the direct current power converted by the conversion unit. The buffer unit is charged in a dischargeable manner by the direct current power converted by the conversion unit, and then the stored power can be discharged to the additional function unit as the direct current power. The control unit controls the additional function unit based on the output voltage of the buffer unit.

The load control method in one aspect of the present invention is a load control method for controlling a load control device. The load control device includes: a switch part; a switch control part; a conversion part; an additional function part; and a buffer part. The switch unit conducts and disconnects the AC power source and the load, thereby controlling the supply of electric power from the AC power source to the load, and causes the load to operate and stop. The switch control unit controls the switch unit. The conversion unit converts AC power supplied from the AC power source into DC power. The additional function unit is operated using the direct current power converted by the conversion unit. The buffer unit is charged in a dischargeable manner by the direct current power converted by the conversion unit, and then the stored power can be discharged to the additional function unit as the direct current power. The aforementioned load control method includes a control process of controlling the aforementioned additional function unit based on the output voltage of the aforementioned buffer unit. [Effects of the invention]

The program in one aspect of the present invention is a program for causing the computer system to execute the load control method of the above aspect.

Hereinafter, the load control device in the embodiment will be described. The following embodiments are only examples of various embodiments of the present invention. In addition, the following embodiment only needs to achieve the purpose of the invention, and various changes can be made in accordance with the design and the like.

(Implementation Type 1) Referring to Fig. 1, the load control device 1 in the first embodiment will be described.

As shown in Fig. 1, the load control device 1 is a two-wire type load control device. The load control device 1 is connected in series between the AC power source B1 and the load Q1, and controls the power supplied from the AC power source B1 to the load Q1. The load control device 1 is operated by electric power from the AC power supply B1. That is, the load Q1 and the load control device 1 are operated by the electric power from the AC power supply B1.

The load control device 1 can be controlled by a control signal generated by a wireless signal from the remote control device 20, for example. In other words, the load control device 1 is controlled by the operation from the remote control device 20, and the operation of the load Q1 can be controlled.

The load Q1 is, for example, a lighting fixture. The lighting fixture is, for example, a lighting fixture installed in a building to illuminate the interior. The load Q1 has two power supply terminals. Input AC power from AC power supply B1 to the two power supply terminals.

The AC power source B1 is, for example, a commercial AC power source. The AC power supply B1 has 2 output terminals. One output terminal is connected to one power terminal of the load Q1 through the circuit H1, and the other output terminal is connected to the other power terminal of the load Q1 through the circuit H2.

The load control device 1 includes: a switch unit 2; a drive circuit 3; a switch control unit 4; a wireless unit 5 (additional function unit); and a power supply unit 6.

The switch unit 2 conducts and disconnects the AC power source B1 and the load Q1. Thereby, the supply of electric power from the AC power supply B1 to the load Q1 is controlled, and the load Q1 is operated and stopped. To actuate the load Q1 means to turn on the load Q1 when the load Q1 is a lighting appliance, and to stop the load Q1 means to turn off the load Q1 when the load Q1 is a lighting appliance. The switch unit 2 is connected in series between the AC power source B1 and the load Q1. That is, the switch section 2 is connected in series to the circuit H1.

The switching unit 2 has two switching elements M1 and M2. The two switching elements M1 and M2 are, for example, semiconductor switching elements, and more specifically, are enhanced N-channel MOSFETs (Metal-Oxide-Semiconductor Field Effect Transistor). The drain of a switch element M1 is electrically connected to an output terminal of the AC power source B1. again. The drain of the other switching element M2 is electrically connected to the other output terminal of the AC power source B1 through the load Q1. Furthermore, the sources of the two switching elements M1 and M2 are electrically connected to each other. The connection point NP3 of the sources of the two switching elements M1 and M2 is grounded. The gates of the two switching elements M1 and M2 are electrically connected to the driving circuit 3. The drive circuit 3 cooperates with the control of the switch control unit 4 to turn on and off the two switching elements M1 and M2.

The switching elements M1 and M2 are connected in series to the circuit H1, and the circuit H1 is turned on and off. One switching element M1 is turned on during the positive half cycle of the AC power source B1, and the other switching element M2 is turned on during the negative half cycle of the AC power source B1. In short, the load control device 1 controls the phase of the AC voltage supplied from the AC power supply B1 to the load Q1, that is, the lighting equipment, by turning on and off the respective switching elements M1 and M2, so as to turn on and dim the lighting equipment. For example, each switching element M1, M2 cooperates with the control of the switch control unit 4, and is turned on (conducted) at the beginning of each half cycle of the AC power supply B1, and at a certain time during the half cycle according to the desired brightness of the load Q1 Close (cut off). In addition, the respective switching elements M1 and M2 can be turned on (conducted) in a desired phase within a half cycle of the AC power supply B1 in accordance with the control of the switch control unit 4, and can be closed (disconnected) at the end of the half cycle.

The drive circuit 3 cooperates with the control of the switch control unit 4 to drive the switch unit 2. In more detail, the driving circuit 3 applies a driving voltage between the gates and sources of the two switching elements M1 and M2 of the switching section 2, so that the two switching elements M1 and M2 are turned on (conducted state) and turned off. (Off state) to switch between.

The wireless unit 5 performs communication (wireless communication) by wireless signals with the remote control device 20 (external communication device). The wireless unit 5 receives the control signal caused by the wireless signal from the remote control device 20. The wireless unit 5 outputs the received control signal to the switch control unit 4. With this output, the wireless unit 5 controls the switch control unit 4. In addition, the signal medium of the wireless signal is infrared or radio waves. The wireless unit 5 is controlled by a control unit 17 described later. The wireless unit 5 may be any of Bluetooth (registered trademark), Zigbee (registered trademark), Wi-Fi (registered trademark), and specific low-power wireless, for example.

The switch control unit 4 cooperates with the control of the wireless unit 5 and controls the switch unit 2 to turn on and off via the drive circuit 3. In this way, the lighting, extinguishing and dimming of the load Q1 are controlled.

In more detail, the switch control unit 4 controls the length of the ON period in each half cycle of the AC power from the AC power source B1. The open period refers to the period from when the switch unit 2 is turned on to when it is turned off. For example, the switch control unit 4 controls the switch unit 2 to turn on at the beginning of each half cycle of the AC power from the AC power source B1 (zero cross point of the AC power), and turns the switch unit 2 off at a desired time within the half cycle. In other words, the switch control section 4 controls the length of the open time of the switch section 2 by controlling the timing of turning off the switch section 2. By controlling the on-time to be zero or a desired length other than zero, the load Q1 is switched between off and on. In addition, the load Q1 is dimmed by controlling the length of the turn-on time.

In addition, the switch control unit 4 can control the length of the ON time by controlling the switch unit 2 to be turned on at a desired timing of the half cycle of the AC power from the AC power source B1, and closing the switch unit 2 at the end of the half cycle.

The power supply unit 6 converts the AC power supplied from the AC power supply B1 into DC power, and then supplies the converted DC power to the drive circuit 3, the switch control unit 4, and the wireless unit 5. That is, the drive circuit 3, the switch control unit 4, and the wireless unit 5 are operated by AC power from the AC power supply B1.

The power supply unit 6 includes: a rectifier circuit 10 (conversion unit); a constant voltage circuit 11; a constant current circuit 12; a DC-DC converter 16 (step-down circuit); smoothing capacitors C1 and C3; a buffer unit 14;

The rectifier circuit 10 converts the AC power supplied from the AC power source B1 into DC power. That is, the rectifier circuit 10 generates DC power from AC power to be supplied to the drive circuit 3, the switch control unit 4, and the wireless unit 5. The rectifier circuit 10 has two rectifier elements D1 and D2. The anodes of the rectifying elements D1 and D2 are connected to branch points NP1 and NP2 on both sides of the switch section 2 in the circuit H1. The cathodes of the rectifier elements D1 and D2 are connected to each other and connected to the input terminal of the constant voltage circuit 11.

The rectifier circuit 10 inputs AC power from the AC power source B1 at the branch points NP1 and NP2, and then converts the input AC power into DC power. In more detail, the rectifier circuit 10 inputs AC power from the branch point NP1 when the cycle of the AC power from the AC power source B1 is a positive half cycle, and converts the input AC power into DC power by the rectification element D1. When the cycle of the AC power from the AC power source B1 is a negative half cycle, the rectifier circuit 10 inputs AC power from the branch point NP2, and converts the input AC power into DC power by rectification by the rectifier element D2. The rectifier circuit 10 outputs a pulsating voltage (direct current voltage) obtained by full-wave rectification of the alternating current voltage supplied from the alternating current power source B1 to the constant voltage circuit 11.

The constant voltage circuit 11 converts the pulsating voltage supplied from the rectifier circuit 10 into a stable direct current voltage (for example, a direct current voltage of 80V) to make the voltage constant. Thereby, the constant voltage circuit 11 stabilizes the DC voltage supplied to the drive circuit 3, the switch control unit 4, and the wireless unit 5. In more detail, the constant voltage circuit 11 converts the voltage value of the voltage V1 of the DC power from the rectifier circuit 10 into a predetermined voltage value and outputs it, and maintains the voltage value of the output voltage V2 at the predetermined voltage value. The constant voltage circuit 11 is composed of, for example, a Zener diode, a resistor, a semiconductor switch, and the like.

A smoothing capacitor C1 is provided in the subsequent stage of the constant voltage circuit 11. In more detail, the smoothing capacitor C1 is connected between the branch point of the circuit between the output terminal of the constant voltage circuit 11 and the input terminal of the constant current circuit 12 and the ground point.

The constant current circuit 12 controls the current I2 of the DC power from the constant voltage circuit 11 (that is, the DC power controlled by the constant voltage circuit 11) to a predetermined current value. That is, the constant current circuit 12 converts the DC current supplied to the drive circuit 3, the switch control unit 4, and the wireless unit 5 into constant current. More specifically, the constant current circuit 12 converts the current value of the current I2 of the DC power from the constant voltage circuit 11 into a predetermined current value and outputs it, and maintains the current value of the output current I3 at the above-mentioned predetermined current value.

The constant current circuit 12 matches the operation state and the stop state of the switch unit 2 (that is, when the load Q1 is on and when it is off), and uses the current value of the output current I2 of the constant voltage circuit 11 as a predetermined current value. Switch between the current value (for example, 0.5 mA) and the second current value (for example, 3.0 mA). The operating state of the switch unit 2 refers to a state in which the switching elements M1 and M2 are controlled to turn on and off, the phase of the AC voltage supplied from the AC power supply B1 to the load Q1 is controlled, and the load Q1 is operated (lit). The stop state of the switch unit 2 refers to a state in which the switching elements M1 and M2 are controlled to turn off, the power supply from the AC power supply B1 to the load Q1 is stopped, and the load Q1 is stopped (extinguished). The second current value is larger than the first current value. In more detail, the constant current circuit 12 converts the current value of the output current I2 of the constant voltage circuit 11 into a first current value and outputs it when the switch unit 2 is stopped (that is, when the load Q1 is off), and the output current The voltage value of I3 is maintained at the first current value. In addition, the constant current circuit 12 converts the current value of the output current I2 of the constant voltage circuit 11 into a second current value in the operating state of the switch section (that is, when the load Q1 is lit) and outputs the current value of the output current I3 The value is maintained at the second current value. The constant current circuit 12 is composed of, for example, a semiconductor switch, a bias resistor, a shunt resistor, a shunt regulator, and the like.

The buffer unit 14 is provided in the subsequent stage of the constant current circuit 12. In more detail, the buffer unit 14 is connected between the branch point NP4 of the circuit between the output terminal of the constant current circuit 12 and the input terminal of the DC-DC converter 16 and the ground point. The buffer unit 14 is composed of a capacitor C2 for buffering. The buffer unit 14 is charged by the output voltage V3 of the constant current circuit 12. That is, the buffer unit 14 stores the output power (output current I3) of the constant current circuit 12 as a chargeable and dischargeable energy source. In addition, the output power of the constant current circuit 12 is generated by the DC power converted by the rectifier circuit 10, so it can be said that "the buffer unit 14 is discharged in a manner by using the DC power converted by the rectifier circuit 10. Being charged". When the output current I3 of the constant current circuit 12 is insufficient, the buffer unit 14 can discharge the charging charge (charging power) as the output current I3 of the constant current circuit 12. Thereby, the shortage of the output current I3 of the constant current circuit 12 is supplemented. In addition, the output voltage V4 of the buffer unit 14 is used as a power supply voltage, and is supplied to the drive circuit 3, the switch control unit 4, and the wireless unit 5 through the DC-DC converter 16. The output voltage V4 of the buffer unit 14 is proportional to the stored charge (stored power) of the buffer unit 14.

The DC-DC converter 16 steps down the voltage value of the DC power voltage V3 output from the constant current circuit 12 to a predetermined voltage value (for example, 3.3V), and supplies the stepped DC power to the switch control unit 4 and the wireless unit 5 and drive circuit 3. That is, the switch control unit 4, the wireless unit 5, and the drive circuit 3 operate using the output power of the DC-DC converter 16. The output power of the DC-DC converter 16 is generated by the DC power converted by the rectifier circuit 10, so it can be said that "the switching control unit 4, the wireless unit 5, and the drive circuit 3 are converted by the rectifier circuit 10). Which is produced by DC power." The above-mentioned predetermined voltage value (for example, 3.3V) is an example of the required voltage required by the switch control unit 4, the wireless unit 5, and the drive circuit 3.

A smoothing capacitor C3 is provided in the subsequent stage of the DC-DC converter 16. In more detail, the smoothing capacitor C3 is connected between the output terminal of the DC-DC converter 16 and the ground point.

The control unit 17 controls the wireless unit 5 based on the output voltage V4 of the buffer unit 14. That is, the control unit 17 determines the operation content of the wireless unit 5 based on the output voltage V4 of the buffer unit 14. In addition, the output voltage V4 of the buffer unit 14 refers to the voltage between the two electrodes of the buffer unit 14.

In more detail, the control unit 17 controls the wireless unit 5 so as to reduce the power consumption of the wireless unit 5 as the output voltage V4 of the buffer unit 14 decreases. In more detail, the control unit 17 detects (that is, monitors) whether the output voltage V4 of the buffer unit 14 is above the threshold voltage. In addition, the output voltage V4 of the buffer unit 14 is proportional to the charge charge of the buffer unit 14. Therefore, the output voltage V4 of the detection buffer 14 is equivalent to the stored charge of the detection buffer 14.

Then, when the output voltage V4 of the buffer unit 14 exceeds the threshold voltage, the control unit 17 operates the wireless unit 5 in a normal operation. Normal operation means that the operation of the wireless unit 5 is not restricted, and both the transmitting and receiving parties can make the wireless unit 5 operate. In addition, the control unit 17 restricts the operation of the wireless unit 5 when the output voltage V4 of the buffer unit 14 is below the threshold voltage. The control unit 17 stops the wireless unit 5 as an example of the restriction on the operation of the wireless unit 5.

The above-mentioned threshold voltage is, for example, a voltage higher than the respective reset voltages of the switch control unit 4 and the wireless unit 5. The reset voltage of the switch control unit 4 refers to the voltage at which the microcontroller (microcomputer) in the switch control unit 4 is reset and restarted. That is, the microcontroller in the switch control unit 4 restarts when the supplied voltage becomes equal to or lower than the reset voltage. Similarly, the reset voltage of the wireless unit 5 refers to the voltage at which the microcontroller in the wireless unit 5 is reset and restarted. That is, the microcontroller in the wireless unit 5 restarts when the supplied voltage becomes equal to or lower than the reset voltage.

In addition, in this embodiment, the switch control unit 4 and the wireless unit 5 are each constituted by, for example, a microcontroller. When the switch control unit 4 and the wireless unit 5 decrease the output voltage of the constant current circuit 12 (that is, the output voltage V4 of the buffer unit 14), and then the voltage of the power supplied to the switch control unit 4 and the wireless unit 5 is lower than the reset voltage , Automatically reset and restart.

As shown in FIG. 2, the control unit 17 is configured as a comparison circuit, for example. The comparison circuit has two input units 17a and 17b; and one output unit 17c. An input portion 17a is electrically connected to the electrode on the high potential side among the two electrodes of the buffer portion 14. Thereby, the output voltage V4 of the buffer unit 14 is input to an input unit 17a. To the other input portion 17b, the threshold voltage Vref is input as a reference voltage. The output part 17c is electrically connected to the wireless part 5. That is, the comparison circuit compares the two voltages (the output voltage V4 of the buffer unit 14 and the threshold voltage Vref) input to the two input units 17a and 17b. Then, the control unit 17 outputs an H-level signal from the output unit 17c when the output voltage V4 of the buffer unit 14 is greater than the threshold voltage Vref as a result of the comparison. In addition, in the above comparison result, the control unit 17 outputs an L-level signal from the output unit 17c when the output voltage V4 of the buffer unit 14 is less than or equal to the threshold voltage Vref. In contrast, the wireless unit 5 operates in a normal operation when receiving the H-level signal from the control unit 17, and restricts (for example, stops) the operation when receiving the L-level signal. In addition, the H-level signal is an example of a control signal for causing the wireless unit 5 to operate in a normal operation, and the L-level signal is an example of a control signal for stopping the wireless unit 5. In this embodiment, the control unit 17 is configured as a comparison circuit to function as a voltage detection circuit that detects the output voltage V4 of the buffer unit 14.

Next, the operation of the load control device 1 will be described. In this load control device 1, the AC power from the AC power supply B1 is input to the power supply unit 6. Then, the AC power input to the power supply unit 6 is rectified by the rectifier circuit 10 to be converted into DC power. Then, the converted DC power is maintained at a predetermined voltage value (for example, 80V) by the constant voltage circuit 11, and maintained at a predetermined current value (first current value or second current value) by the constant current circuit 12, and the DC -The DC converter 16 steps down to a predetermined voltage value (for example, 3.3V). Then, the DC power stepped down by the DC-DC converter 16 is supplied to the drive circuit 3, the switch control unit 4, and the wireless unit 5. With this power supply, the drive circuit 3, the switch control unit 4, and the wireless unit 5 operate. In addition, the buffer unit 14 is charged by the output voltage V3 of the constant current circuit 12. Then, the current consumption of the drive circuit 3, the switch control unit 4, and the wireless unit 5 increases, and if the output current I3 of the constant current circuit 12 is insufficient, the charging charge (charging power) of the buffer unit 14 is used as the output current I3 of the constant current circuit 12 Release to make up for the insufficient amount. Then, the discharge current is supplied to the drive circuit 3, the switch control unit 4, and the wireless unit 5 as the output current I3. In this way, insufficient power supplied to the drive circuit 3, the switch control unit 4, and the wireless unit 5 can be avoided.

In this embodiment, the first current value (the current value of the output current I3 of the constant current circuit 12 when the load Q1 is off) is set to 0.5 mA as an example. The premise of this setting is that when the load Q1 is off, when the current consumption of the circuit for controlling the power supply to the load Q1 (such as the switch control unit 4 and the wireless unit 5) is 0.7 mA or less, the load Q1 will not light up by mistake. Then, in order to maintain a slight margin in this case, the first current value is set to 0.5 mA.

When the first current value is 0.5 mA, if the output voltage of the constant current circuit 12 is set to 50V, the output power of the constant current circuit 12 is 25 mW (=0.5mA×50V). Then, if the efficiency of the DC-DC converter 16 is set to 80%, the output power of the DC-DC converter 16 is 20 mW (=25 mW×80%). At this time, the current consumption that can be consumed by the switch control unit 4 and the wireless unit 5 is about 6 mA. At this time, when the current consumption of the switch control unit 4 and the wireless unit 5 exceeds 6 mA instantaneously, the charge of the buffer unit 14 is discharged, and the output current I3 of the constant current circuit 12 is maintained at the first current value (0.5 mA).

In this embodiment, as an example, the second current value (the current value of the output current I3 of the constant current circuit 12 when the load Q1 is on) is set to a relatively low current value, namely 5.0 mA, as an example. As a result, when the load Q1 is lit, the impedance seen from the load Q1 becomes smaller. As a result, when the current consumption of the switch control unit 4 and the wireless unit 5 is large, even if the current consumption of the switch control unit 4 and the wireless unit 5 fluctuates, the load Q1 can be maintained in a stable lighting state without fluctuations.

In the load control device 1, when the output voltage V4 of the buffer unit 14 exceeds the threshold voltage Vref, the control unit 17 does not restrict the operation of the wireless unit 5 (that is, the normal operation), but causes the wireless unit 5 to operate. In addition, when the output voltage V4 of the buffer unit 14 is equal to or lower than the threshold voltage Vref, the control unit 17 restricts (for example, stops) the transmission of the wireless unit 5. Thereby, the power consumption of the wireless unit 5 is suppressed. As a result, it is possible to prevent the output voltage V4 of the buffer unit 14 from falling below the prescribed voltage (reset voltage). Then, when the output voltage V4 of the buffer unit 14 exceeds the threshold voltage Vref, the control unit 17 causes the wireless unit 5 to operate in a normal operation.

As described above, according to the load control device 1 in this embodiment, the discharge charge of the buffer unit 14 can absorb the fluctuations in the power consumption of the switch control unit 4 and the wireless unit 5. Thereby, it is possible to prevent the erroneous operation of the load Q1 caused by the fluctuation of the power consumption of the switch control unit 4 and the wireless unit 5. Furthermore, the wireless unit 5 is controlled by the output voltage V4 of the buffer unit 14. Therefore, it is possible to prevent the power supply voltage supplied from the output voltage V4 of the buffer unit 14 from falling below a predetermined voltage (for example, a reset voltage). That is, if the switch control unit 4 and the wireless unit 5 are reset and restarted, the switch control unit 4 and the wireless unit 5 cannot be used for a certain period of time until the switch control unit 4 and the wireless unit 5 are reset and restarted. As described above, by preventing the power supply voltage supplied by the output voltage V4 of the buffer unit 14 from falling below the predetermined voltage, it is possible to prevent the switch control unit 4 and the wireless unit 5 from being unavailable for a certain period of time.

(Modifications of Implementation Type 1, and Other Implementation Types) The first embodiment is only one of the various embodiments of the present invention. As long as the purpose of the invention can be achieved, various changes can be made in accordance with the design and the like. Furthermore, the aspect in the first embodiment is not necessarily realized by the load control device 1. For example, the aspect in the first embodiment can be realized by a load control method, a computer program, or a storage medium storing the program. The modification of Embodiment 1 described below and other embodiments (including modification examples) can be appropriately combined and applied.

The above-mentioned load control method is a load control method for controlling the load control device 1. The load control device 1 includes: a switch unit 2; a switch control unit 4; a rectifier circuit 10 (conversion unit); additional function units 5, 5A, 5B, 7;部14;及控制部4. The switch unit 2 controls the supply of electric power from the AC power supply B1 to the load Q1 by turning on and cutting off the AC power supply B1 and the load Q1, thereby causing the load Q1 to operate and stop. The switch control unit 4 controls the switch unit 2. The rectifier circuit 10 converts the AC power supplied from the AC power source B1 into DC power. The additional function units 5, 5A, 5B, and 7 operate using the DC power converted by the rectifier circuit 10. The buffer unit 14 is charged in a dischargeable manner by the DC power converted by the rectifier circuit 10, and then the stored power is discharged to the additional function units 5, 5A, 5B, and 7 as DC power. The load control method includes a control process of controlling the additional function units 5, 5A, 5B, and 7 based on the output voltage V4 of the buffer unit 14.

(Modification 1) In the first embodiment, a case where the additional function unit is the wireless unit 5 is exemplified. However, the additional function unit is not limited to the wireless unit 5, and it may be any processing unit as long as it is a processing unit operated by direct current power converted by the rectifier circuit 10 through power conversion. For example, the additional function unit may be a display unit or a voice recognition unit, or a processing unit that performs operations different from the switch control unit. In addition, the display unit is, for example, a device that can display information about the load Q1. The voice recognition unit is a device for the user to input the operation of the load Q1 by voice.

(Modification 2) In the first embodiment, the constant voltage circuit 11, the constant current circuit 12, and the DC-DC converter 16 are provided, but all of the circuits 12, 13, and 16 may not be provided as shown in FIG. 3A. In the case of the example of FIG. 3A, the output current of the rectifier circuit 10 directly causes the buffer section 14 to be charged in a chargeable and dischargeable manner. Then, the discharged power of the buffer unit 14 is directly supplied to the switch control unit 4 and the wireless unit 5. In addition, only one or both of the circuits 12, 13, and 16 may be provided. For example, in a case where only the constant current circuit 12 among the circuits 12, 13, and 16 is provided, the configuration is as shown in FIG. 3B. In the case of the example of FIG. 3B, the output current of the rectifier circuit is directly input to the constant current circuit. Then, as in the case of FIG. 3A, the discharged power of the buffer unit 14 is directly supplied to the switch control unit 4 and the wireless unit 5.

(Modification 3) In the first embodiment, the control unit 17 can be constituted by, for example, a microcomputer mainly composed of a processor and a memory. In other words, the control unit 17 can be realized by a computer system having a processor and a memory. At this time, the processor executes an appropriate program, so that the computer system functions as the control unit 17. The program can be pre-stored in the memory, and can also be stored in a non-temporary recording medium such as a memory card via the network and other electrical communication loops. Similarly, the switch control unit 4 and the wireless unit 5 (additional function unit) may be composed of, for example, a microcomputer mainly composed of a processor and a memory.

(Implementation Type 2) The second embodiment is different from the first embodiment in the following point: the operation of the wireless unit 5 is limited in stages in accordance with the output voltage V4 of the buffer unit 14. The load control device 1 in the second embodiment is configured in the same manner as in the first embodiment as shown in FIG. 1.

In the second embodiment, the control unit 17 has a plurality of (for example, two) threshold voltages Vref1 and Vref2 (Vref1>Vref2) which are different voltages from each other. The control unit 17 compares the output voltage V4 of the buffer unit 14 and the magnitude of each of the two threshold voltages Vref1 and Vref2, and then outputs the comparison result to the wireless unit 5. The wireless unit 5 restricts the operation in stages in accordance with the comparison result from the control unit 17.

The wireless unit 5 has a plurality of (for example, three) operation modes. The multiple operation modes include normal mode, transmission prohibition mode, and reception prohibition mode. The normal mode is a mode in which the wireless unit 5 can transmit and receive (that is, a mode in which the operation of the wireless unit 5 is not restricted). The transmission prohibition mode is a mode in which transmission during transmission and reception by the wireless unit 5 is prohibited, and only reception is permitted. The reception prohibition mode is a mode in which reception during transmission and reception by the wireless unit 5 is prohibited, and only transmission is permitted.

In this embodiment, the power consumption required for reception by the wireless unit 5 is smaller than the power consumption required for transmission by the wireless unit 5. Therefore, in the order of the normal mode, the reception prohibition mode, and the transmission prohibition mode, the power consumption becomes smaller.

As shown in FIG. 4, the wireless unit 5 restricts the operation in stages from among the three operation modes in accordance with the comparison result from the control unit 17. In the example of FIG. 4, the wireless unit 5 restricts the operation mode of the wireless unit 5 by gradually reducing the power consumption in accordance with the decrease in the output voltage V4 of the buffer unit 14. That is, when the comparison result of the control unit 17 is that the output voltage V4 of the buffer unit 14 is greater than the threshold voltage Vref1 (S1: Yes), the wireless unit 5 operates in the normal mode (S2). That is, since the output voltage V4 of the buffer unit 14 is very high, the wireless unit 5 can operate without restriction. Then, the process returns to step S1. In addition, when the comparison result of the control unit 17 is that the output voltage V4 of the buffer unit 14 is below the threshold voltage Vref1 (S1: No) and greater than the threshold voltage Vref2 (S3: Yes), the output of the buffer unit 14 The voltage V4 drops slightly, so the wireless unit 5 operates in the reception prohibition mode (S4). Then, the process returns to step S1. In addition, when the comparison result of the control unit 17 is that the output voltage V4 of the buffer unit 14 is below the threshold voltage Vref2 (S3: No), the output voltage V4 of the buffer unit 14 is greatly reduced, so the wireless unit 5 consumes power The smallest transfer prohibited mode action (S5). Then, the process returns to step S1.

In this way, by cooperating with the output voltage V4 of the buffer unit 14 to restrict the operation of the wireless unit 5 in stages, the wireless unit 5 can be prevented from being completely stopped.

In addition, in the second embodiment, a case where there are three operation modes is exemplified, and the number of operation modes is not limited to three. For example, when there are two operation modes (for example, a normal mode and a transmission prohibited mode), the threshold voltage is one. At this time, when the output voltage V4 of the buffer unit 14 exceeds the threshold voltage, the wireless unit 5 operates in the normal mode, and when the output voltage V4 of the buffer unit 14 is below the threshold voltage, the wireless unit 5 operates in the transmission prohibition mode. That is, when the output power V4 of the buffer unit 14 decreases, transmission is prohibited and reception is activated. As a result, the receiving function with low power consumption can be operated for a longer time than the transmitting function.

(Implementation Type 3) As shown in FIG. 5, the load control device 1 of the third embodiment includes a plurality of additional function units (for example, two wireless units 5A, 5B) in the first embodiment. The two wireless units 5A and 5B are different from each other in at least one of a frequency and a communication method, for example. The two wireless units 5A and 5B may be, for example, two different communication methods among Bluetooth, Zigbee, Wi-Fi, and specific low-power wireless. In this embodiment, the wireless unit 5A is, for example, Bluetooth, and the wireless unit 5B is, for example, specific low-power wireless.

The control unit 17 of this embodiment causes the two wireless units 5A and 5B to operate in the normal mode when the output voltage V4 of the buffer unit 14 exceeds the threshold voltage. Also, the normal mode refers to a mode in which both transmission and reception can be performed without restricting actions. In addition, when the output voltage V4 of the buffer unit 14 is below the threshold voltage, the control unit 17 causes one of the two wireless units 5A and 5B to operate in the normal mode (the wireless unit that communicated last time). That is, the operation is not restricted, but the operation of other wireless units is restricted (for example, stopped). As a result, the wireless unit that communicated last time can be used in the normal mode for a longer period of time. Also, "the last time communication was performed" refers to the last communication in time sequence. In addition, the control unit 17 stores the communication history of each of the two wireless units 5A and 5B, and based on the communication history, defines the wireless unit that has performed communication most recently from among the two wireless units 5A and 5B.

(Implementation Type 4) In the third embodiment, when the output voltage V4 of the buffer unit 14 is below the threshold voltage, from among the plurality of wireless units 5A and 5B, the wireless unit that communicated most recently is operated in the normal mode and restricted (e.g., stopped) Actions of other wireless parts. In contrast, in this embodiment, when the output voltage V4 of the buffer unit 14 is below the threshold voltage, the operation of the wireless unit 5A that consumes the most power is restricted (e.g., stopped) among the wireless units 5A and 5B. , And make the other wireless unit 5B operate in the normal mode. Thereby, the other wireless unit 5B among the plurality of wireless units 5A and 5B can be operated for a longer time. Also, in this embodiment, similar to the third embodiment, when the output voltage V4 of the buffer unit 14 exceeds the threshold voltage, the control unit 17 causes the plurality of wireless units 5A and 5B to operate in the normal mode. In addition, the load control device 1 of the present embodiment is also configured in the same manner as in the third embodiment as shown in FIG. 5.

(Implementation Type 5) As shown in FIG. 6, the load control device 1 in this embodiment includes a plurality of (for example, two) additional function units 5 and 7 in the first embodiment. In this embodiment, the additional function unit 5 is, for example, the same wireless unit as in the first embodiment, and the additional function unit 7 is, for example, a display unit that displays various information related to the load Q1. Hereinafter, the additional function units 5 and 7 are also referred to as the wireless unit 5 and the display unit 7, respectively. The display unit 7 can cooperate with the control of the control unit 17 to switch the brightness of the display screen between two levels (high brightness and low brightness).

In addition, the control unit 17 of the present embodiment has a plurality of (for example, two) threshold voltages Vref3 and Vref4. The plurality of threshold voltages Vref3 and Vref4 correspond to the plurality of additional function units 5 and 7, respectively. That is, the threshold voltages Vref3 and Vref4 are set for each of the plurality of additional function units 5 and 7. In this embodiment, the two threshold voltages Vref3 and Vref4 are, for example, voltages different from each other.

The control unit 17 cooperates with the output voltage V4 of the buffer unit 14 to control the plurality of additional function units 5 and 7 with different control contents. In more detail, the control unit 17 causes the wireless unit 5 to operate in the normal mode when the output voltage V4 of the buffer unit 14 exceeds the threshold voltage Vref3, for example, as in the first embodiment. In addition, the control unit 17 restricts (for example, stops) the operation of the wireless unit 5 when the output voltage V4 of the buffer unit 14 is equal to or lower than the threshold voltage Vref3. In addition, the control unit 17 makes the display screen of the display unit 7 emit light with high luminance when the output voltage V4 of the buffer unit 14 exceeds the threshold voltage Vref4 for the display unit 7, for example. In addition, the control unit 17 causes the display unit 7 to emit light with low luminance when the output voltage V4 of the buffer unit 14 is equal to or lower than the threshold voltage Vref4 for the display unit 7.

In this embodiment, the control unit 17 includes a plurality of (for example, two) comparison circuits 17A and 17B. The plurality of comparison circuits 17A and 17B correspond to the plurality of additional function units 5 and 7, respectively. Each of the comparison circuits 17A and 17B includes two input units and one output unit, respectively. In each of the comparison circuits 17A and 17B, one input part is connected to the electrode on the high potential side among the two electrodes of the buffer part 14, and the other input part is input with corresponding threshold voltages Vref3 and Vref4, and the output part is electrically connected to Corresponding additional functions 5, 7.

In this embodiment, when the output voltage V4 of the buffer unit 14 exceeds the threshold voltage Vref3, the comparison circuit 17A outputs an H-level signal to the wireless unit 5, and the wireless unit 5 operates in the normal mode by the signal. In addition, when the output voltage V4 of the buffer unit 14 is below the threshold voltage Vref3, the comparison circuit 17A outputs an L-level signal to the wireless unit 5, and the wireless unit 5 is caused by the signal.

Furthermore, when the output voltage V4 of the buffer unit 14 exceeds the threshold voltage Vref4, the comparison circuit 17B outputs an H-level signal to the display unit 7, and the signal causes the display screen of the display unit 7 to emit light with high brightness. In addition, when the output voltage V4 of the buffer unit 14 is below the threshold voltage Vref4, the comparison circuit 17B outputs an L-level signal to the display unit 7, and the display screen of the display unit 7 emits light with low brightness based on the signal. By making the brightness of the display screen emit light with low brightness, the power consumption of the display unit 7 is reduced.

According to this embodiment, a plurality of additional function units 5 and 7 are provided, and threshold voltages Vref1 and Vref2 are set for each of the plurality of additional function units 5 and 7. Therefore, when a plurality of additional function units 5 and 7 are provided, the threshold voltages Vref1 and Vref2 that restrict the operation of the respective additional function units 5 and 7 can be made different for the respective additional function units 5 and 7. In this way, the voltage required for the operation of the additional function parts 5 and 7 can be individually considered, and the operation of the additional function parts 5 and 7 can be restricted.

In addition, the plurality of additional function units 5 and 7 are controlled with different control contents according to the output voltage V4 of the buffer unit 14. Therefore, it is possible to control each of the plurality of additional function units 5 and 7 with optimal content.

In addition, in this embodiment, the wireless unit and the display unit are exemplified as the plurality of additional function units 5 and 7, and the plurality of additional function units 5 and 7 are not limited to the wireless unit and the display unit.

(Summarize) The load control device (1) of the first aspect includes: a switch part (2); a switch control part (4); a conversion part (10); an additional function part (5, 5A, 5B, 7); a buffer part (14) ; And the control section (17). The switch unit (2) conducts and cuts off the AC power supply (B1) and the load (Q1), thereby controlling the supply of power from the AC power supply (B1) to the load (Q1), and operating the load (Q1) And stop. The switch control part (4) controls the switch part (2). The conversion unit (10) converts the AC power supplied from the AC power supply (B1) into DC power. The additional function units (5, 5A, 5B, 7) operate using DC power converted by the conversion unit (10). The buffer part (14) is charged in a dischargeable manner by the DC power converted by the conversion part (10), and then the stored power can be discharged to the additional function part (5, 5A, 5B, 7) as The aforementioned DC power. The control unit (17) controls the additional function units (5, 5A, 5B, 7) based on the output voltage (V4) of the buffer unit (14).

According to this configuration, the additional function units (5, 5A, 5B, 7) are controlled by the output voltage (V4) of the buffer unit (14), thereby suppressing the output voltage (V4) of the buffer unit (14). The supplied power supply voltage is reduced to become a predetermined voltage (for example, reset voltage) or less.

The load control device (1) of the second aspect is the same as the first aspect. The control part (17) controls the additional function parts (5, 5A, 5B, 7) so that the output voltage (V4) of the buffer part (14) ) To reduce the power consumption of the additional function units (5, 5A, 5B, and 7).

According to this configuration, it is possible to prevent the power supply voltage supplied from the output voltage (V4) of the buffer unit (14) from falling to a predetermined voltage (for example, a reset voltage) or less.

The load control device (1) of the third aspect is the same as the first or second aspect, in which a constant current circuit (12) is provided to supply one of the direct current power to the additional function unit (5, 5A, 5B, 7) The current is constant current.

According to this configuration, the constant current circuit (12) can avoid the influence of the fluctuation of the consumption current of the additional function unit (5, 5A, 5B, 7) from affecting the operation of the load (Q1). This prevents the load (Q1) from malfunctioning due to fluctuations in the consumption current of the additional function units (5, 5A, 5B, and 7).

The load control device (1) of the fourth aspect is the same as any one of the first to third aspects, wherein the additional function parts (5, 5A, 5B, 7) are for wireless communication with an external communication device (20) Wireless Department (5, 5A, 5B).

According to this configuration, it is possible to avoid the influence of the fluctuation of the consumption current of the wireless unit (5, 5A, 5B) on the operation of the load (Q1).

The load control device (1) of the fifth aspect is the same as any one of the first to fourth aspects, wherein the number of additional function units (5, 5A, 5B, 7) is multiple. The control unit (17) matches the output voltage (V4) of the buffer unit (14), and among the additional function units (5A, 5B), it does not limit the operation of the last additional function unit that communicated last time, but Restrict the actions of other additional functions.

According to this configuration, it is possible to use the wireless unit that communicated last time for a longer period of time.

The load control device (1) of the sixth aspect is the same as any one of the first to fifth aspects, and includes a constant voltage circuit (11), which will be supplied to the additional function parts (5, 5A, 5B, 7) The voltage of the DC power is constant.

According to this structure, the constant voltage circuit (11) can avoid the influence of the voltage fluctuation of the additional function unit (5, 5A, 5B, 7) from affecting the operation of the load (Q1). In this way, it is possible to prevent the load (Q1) from malfunctioning due to voltage fluctuations of the additional function units (5, 5A, 5B, and 7).

The load control device (1) of the seventh aspect is the same as any one of the first to sixth aspects, wherein the additional function part (7) is a display part that displays information about the load (Q1).

According to this structure, it is possible to avoid the influence of the fluctuation of the power consumption of the display unit (7) on the operation of the load (Q1).

The load control device (1) of the eighth aspect is the same as any one of the first to seventh aspects, wherein the output voltage (V4) of the control section (17) in the buffer section (14) is the threshold voltage (Vref, Below Vref1~Vref4), the operation of the additional function unit (5, 5A, 5B, 7) is restricted.

According to this configuration, when the output voltage (V4) of the buffer unit (14) is below the threshold voltage (Vref, Vref1~Vref4), the operation of the additional function unit (5, 5A, 5B, 7) is restricted, so it can be avoided The power supply voltage supplied from the output voltage (V4) of the buffer unit (14) decreases and becomes below a predetermined voltage (for example, a reset voltage).

The load control device (1) of the ninth aspect is the same as the eighth aspect, in which the additional function units (5, 5A, 5B, 7) are restarted when the voltage of the supplied DC power becomes lower than the reset voltage. The threshold voltage (Vref, Vref1~Vref4) is larger than the aforementioned reset voltage.

According to this configuration, the output voltage (V4) of the buffer unit (14) can be further prevented from falling below a predetermined voltage (for example, the reset voltage) due to the fluctuation of the power consumption of the additional function units (5, 5A, 5B, and 7).

The load control device (1) of the tenth aspect is the same as the eighth or ninth aspect, in which the number of additional function parts (5, 7) is multiple. The threshold voltage (Vref3, Vref4) is set for each of the plurality of additional function units (5, 7).

According to this configuration, when a plurality of additional function units (5, 7) are provided, the threshold voltage (Vref3, Vref4) that restricts the operation of each additional function unit (5, 7) can be adjusted along with the additional function unit (5, 7). ) But different. In this way, the voltage required for the operation of the additional function unit (5, 7) can be individually considered, and the operation of the additional function unit (5, 7) can be restricted.

The load control device (1) of the eleventh aspect is the same as any one of the first to tenth aspects, wherein the number of additional function parts (5A, 5B) is multiple. When the output voltage (V4) of the buffer unit (14) is below the threshold voltage, the control unit (17) restricts the additional function unit (5A, 5B) that consumes the most power from among the plurality of additional function units (5A, 5B) ) Of the action.

According to this configuration, from among the plurality of additional function units (5A, 5B), other additional function units that minimize power consumption can be operated for a longer period of time.

The load control device (1) of the twelfth aspect is the same as any one of the first to eleventh aspects, wherein the number of additional function parts (5A, 5B) is multiple. The control unit (17) controls a plurality of additional function units (5A, 5B) with different control contents according to the output voltage (V4) of the buffer unit (14).

According to this configuration, it is possible to control each of the plurality of additional function units (5A, 5B) with optimal control content based on the output voltage (V4) of the buffer unit (14).

The load control device (1) of the thirteenth aspect is the same as any one of the first to twelfth aspects, wherein the control part (17) matches the output voltage (V4) of the buffer part (14), and limits the addition in stages The action of the functional part (5).

According to this configuration, it is possible to prevent the operation of the additional function unit (5) from suddenly stopping completely.

The load control method of the fourteenth aspect controls a load control device (1), which includes: a switch part (2); a switch control part (4); a conversion part (10); an additional function part (5, 5A, 5B, 7) ; And the buffer (14). The switch unit (2) conducts and cuts off the AC power supply (B1) and the load (Q1), thereby controlling the supply of power from the AC power supply (B1) to the load (Q1), and operating the load (Q1) And stop. The switch control part (4) controls the switch part (2). The conversion unit (10) converts the AC power supplied from the AC power supply (B1) into DC power. The additional function units (5, 5A, 5B, 7) operate using DC power converted by the conversion unit (10). The buffer part (14) is charged in a dischargeable manner by the DC power converted by the conversion part (10), and then the stored power can be discharged to the additional function part (5, 5A, 5B, 7) as DC power. The load control method includes a control process of controlling the additional function units (5, 5A, 5B, 7) based on the output voltage (V4) of the buffer unit (14).

According to this configuration, the additional function units (5, 5A, 5B, 7) are controlled by the output voltage (V4) of the buffer unit (14), so the power supplied by the output voltage (V4) of the buffer unit (14) The voltage drops and becomes below a predetermined voltage (for example, reset voltage).

The program of the 15th aspect is a program for the computer system to execute the load control method of the 14th aspect.

According to this configuration, a program for causing the processor to execute the above-mentioned load control method can be provided.

1: Load control device 2: Switch part 3: drive circuit 4: Switch control part 5, 5A, 5B: Wireless Department (Additional Function Department) 6: Power supply department 7: Display part (additional function part) 10: Rectifier circuit (conversion part) 11: Constant voltage circuit 12: Constant current circuit 14: Buffer 16: DC-DC converter 17: Control Department 20: Remote control device B1: AC power C1, C2, C3: smoothing capacitor D1, D2: rectifier components H1, H2: Circuit I2, I3, I4: output current M1, M2: switching element NP1, NP2, NP3, NP4: branch point Q1: Load V1, V2, V3, V4: output voltage Vref, Vref1~Vref4: threshold voltage

[Fig. 1] Fig. 1 is a schematic diagram of the configuration of a load control device in Embodiment 1. [Fig. [Fig. 2] Fig. 2 is a schematic diagram of the configuration of the control unit of the same load control device. [Fig. 3A] Fig. 3A is a schematic configuration diagram of a load control device in a modification 2 of the first embodiment. [Fig. 3B] Fig. 3B is a schematic configuration diagram of a modification of the load control device in modification 2. [Fig. 4] Fig. 4 is a flowchart illustrating the operation of the control unit of the load control device in the second embodiment. [Fig. 5] Fig. 5 is a schematic diagram of the configuration of the load control device in the third and fourth embodiments. [Fig. 6] Fig. 6 is a schematic diagram of the configuration of a load control device in the fifth embodiment.

1: Load control device

2: Switch part

3: drive circuit

4: Switch control part

5: Wireless Department (Additional Function Department)

6: Power supply department

10: Rectifier circuit (conversion part)

11: Constant voltage circuit

12: Constant current circuit

14: Buffer

16: DC-DC converter

17: Control Department

20: Remote control device

B1: AC power

C1, C2, C3: smoothing capacitor

D1, D2: rectifier components

H1, H2: Circuit

I2, I3, I4: output current

M1, M2: switching element

NP1, NP2, NP3, NP4: branch point

Q1: Load

V1, V2, V3, V4: output voltage

Claims (14)

A load control device comprising: a switch unit that conducts and cuts off an AC power source and a load, thereby controlling the supply of power from the AC power source to the load, and operating and stopping the load; switch control Section, which controls the switch section; conversion section, which converts the AC power supplied from the AC power supply into DC power; additional function section, which operates using the DC power converted by the conversion section; buffer section, which The DC power converted by the conversion unit is charged in a dischargeable manner, and then the stored power can be discharged to the additional function unit as the DC power; the control unit is based on the output of the buffer unit The additional function part is controlled by voltage; and a constant current circuit which converts the current of the DC power supplied to the additional function part into a constant current. The load control device of claim 1, wherein the control unit controls the additional function unit so as to reduce the power consumption of the additional function unit as the output voltage of the buffer unit decreases. Such as the load control device of claim 1 or 2, wherein the aforementioned additional function part is a wireless part that performs wireless communication with an external communication device. For example, the load control device of claim 1 or 2, wherein the number of the aforementioned additional function units is multiple, the aforementioned control unit cooperates with the output voltage of the aforementioned buffer unit, and among the aforementioned multiple additional function units, the latest communication is not restricted The action of an additional function part is restricted to the actions of other additional function parts. The load control device of claim 1 or 2 further includes a constant voltage circuit that converts the voltage of the direct current power supplied to the additional function unit into a constant voltage. Such as the load control device of claim 1 or 2, wherein the additional function part includes a display part that displays information about the load. The load control device of claim 1 or 2, wherein the control unit restricts the operation of the additional function unit when the output voltage of the buffer unit is below the threshold voltage. Such as the load control device of claim 7, wherein the additional function unit restarts when the voltage of the supplied DC power becomes below the reset voltage, and the threshold voltage is greater than the reset voltage. Such as the load control device of claim 7, wherein the number of the aforementioned additional functional units is plural, and the aforementioned threshold voltage is set separately for each of the aforementioned multiple additional functional units. For example, in the load control device of claim 1 or 2, wherein the number of the additional function units is plural, and the control unit restricts the output voltage of the buffer unit below the threshold voltage from among the plurality of additional function units. The operation of the additional function unit that consumes the most power. For example, the load control device of claim 1 or 2, wherein the number of the additional function parts is multiple, and the control part controls the plurality of additional function parts with different control contents according to the output voltage of the buffer part. Such as the load control device of claim 1 or 2, wherein the control unit cooperates with the output voltage of the buffer unit to limit the action of the additional function unit in stages. A load control method that controls a load control device, the load control device having: a switch unit that conducts and cuts off an AC power source and a load, thereby controlling the supply of power from the AC power source to the load, and Operate and stop the aforementioned load; switch control unit, which controls the aforementioned switch unit; conversion unit, which converts the AC power supplied from the aforementioned AC power supply into DC power; additional function unit, which uses the aforementioned conversion unit converted by the aforementioned conversion unit Actuated by direct current power; a buffer part, which is charged in a dischargeable manner by the direct current power converted by the conversion part, and then the stored power can be discharged to the additional function part as the direct current power; and A constant current circuit that converts the current of the DC power supplied to the additional function part into a constant current; the load control method includes a control process of controlling the additional function part according to the output voltage of the buffer part. A program for making the computer system execute the load control method described in claim 13.

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