JP7004557B2 - Inrush power control device, power control system and control method - Google Patents

Description

The present invention relates to an inrush power suppression device, a power control system and a control method.

A contact type switch is generally used for a switch of a lighting device because of its advantages of good insulation performance, low cost, and high availability. These include rocker switches for manual use and electromagnetic relays for external control.

However, in a device having an AC / DC (alternating current / direct current) power supply unit such as LED (light emitting diode) lighting, a capacitor is provided in the DC circuit section for voltage smoothing and stabilization. Therefore, when the contact type switch is turned on and off, a large inrush current may flow if the AC voltage at the time of turning on is high, depending on the turning on timing of the switch.

If a large inrush current flows through the switch when the switch is turned on, such as LED lighting, problems such as contact welding of the switch, noise generation, and deterioration of semiconductor parts may occur. In order to prevent such a problem, the number of LED lights supplied from one switch may be limited to a number far smaller than the allowable current of the switch. In this case, since the number of switches required is larger than the number of lights, there is a problem that the cost of goods and the cost of construction work are increased. For example, in an electromagnetic relay, the TV rating is specified separately from the rated current for the supply to the inrush current load, and the inrush current upper limit and the usage range of the steady current are separately specified for each TV rating category. There is. The TV rating is one of the typical ratings for evaluating the inrush current performance in the UL and CSA standards, and indicates the degree to which the relay can open and close the load including the inrush current.

Patent Document 1 describes an example of a technique for suppressing an inrush current as described above. In the switchgear described in Patent Document 1, a bypass circuit including a variable impedance and a series circuit of the auxiliary switchgear is connected in parallel with the main switchgear. When the circuit is closed, the auxiliary switch is first closed, then the impedance of the variable impedance is changed from high to low, and then the main switch is closed. On the other hand, when opening the circuit, the main switch is first opened, then the impedance of the variable impedance is changed from low to high, and then the auxiliary switch is opened. According to this configuration, the change in impedance can be moderated at the time of opening and closing, and for example, the inrush current can be suppressed. The variable impedance described in Patent Document 1 is configured by connecting a plurality of sets of resistances and a pair of thyristors connected in parallel to the resistances in opposite directions in series.

Japanese Unexamined Patent Publication No. 4-82119

As described above, in the switchgear described in Patent Document 1, a variable impedance for passing a current flowing through a load is configured by using a plurality of resistances. Therefore, depending on the magnitude of the current that opens and closes, there is a problem that the size of the resistance becomes large or special cooling is required.

The present invention has been made in view of the above circumstances, and provides an inrush current suppression device, a power control system, and a control method capable of suppressing an inrush current without using a variable impedance for passing a current flowing through a load. The purpose is.

In order to solve the above problems, one aspect of the present invention is an inrush power suppression device that suppresses an inrush current when starting to supply AC power to a load that consumes AC power, and is in a conduction state or a cutoff state. When the first control signal instructing is input, the semiconductor element that transitions to the conduction state or the cutoff state at a predetermined phase of AC, the first switch electrically connected to the semiconductor element in series, and the semiconductor. A second switch arranged in a bypass circuit that bypasses the element, a control unit that controls the semiconductor element, the first switch, and the second switch are provided , and supply of the AC power to the load is started. And there is a power supply control device that shuts off, the load includes a plurality of electric devices that are input in synchronization with each other, and the addition result of each inrush current of the plurality of electric devices is the tolerance of the inrush current of the power supply control device. The value is exceeded, and the first switch and the second switch are provided between the power supply control device and the load when the control unit starts supplying power to the load. From the state in which both are cut off, (1) the first switch is made to be in a conductive state, and the first control signal instructing the semiconductor element to be in a conductive state is output, and then (2) for a predetermined time. After that, it is a rush power suppression device that suppresses the rush current to the load by making the second switch conductive.

In the inrush power suppression device of the above aspect, the bypass circuit is electrically connected to the first switch and the semiconductor element connected in series so as to be electrically parallel to each other.

In the inrush power suppression device of the above aspect, when the control unit starts supplying power to the load, both the first switch and the second switch are cut off from the state (1). The first switch is put into a conductive state and the first control signal instructing the semiconductor element to be in a conductive state is output. Then, after (2) a predetermined time, the second switch is put into a conductive state. Further, (3) after a predetermined time, the first switch is turned off and the first control signal instructing the semiconductor element of the cutoff state is output.

In the inrush power suppression device of the above aspect, when the control unit cuts off the supply of power to the load, the second switch is in a conductive state and the first switch and the semiconductor switch are in a cutoff state. From the control state, (4) the first switch is brought into the conduction state and the first control signal instructing the semiconductor element of the continuity state is output, and then (5) after a predetermined time, the first. 2 The switch is turned off, then (6) after a predetermined time, the first control signal instructing the semiconductor element of the cutoff state is output, and then (7) after a predetermined time, the said Turn off the first switch.

In the inrush current suppression device of the above aspect, the control unit outputs the first control signal indicating the conduction state to the semiconductor element until the second switch is brought into the conduction state. The predetermined time of 2) is set longer than the period from when the energization of the load is started until the inrush current accompanying the start of energization falls within the predetermined range, and the inrush power suppression device is used for each of the predetermined times. Further, an adjusting unit is provided so that at least one can be adjusted from the outside.

Further, one aspect of the present invention is a power control system including the inrush power suppression device and a power supply control device for starting and stopping the supply of the AC power to the load.

In the power control system of the above aspect, the plurality of electric devices are a plurality of lighting devices of the same type connected in parallel to each other.

Further, one aspect of the present invention is a control method for an inrush current suppressing device that suppresses an inrush current when starting supply of AC power to a load that consumes AC power. When a first control signal indicating a conduction state or a cutoff state is input, a semiconductor element that transitions to the continuation state or the cutoff state in a predetermined phase of AC and a first one electrically connected in series to the semiconductor element. It includes a switch, a second switch arranged in a bypass circuit that bypasses the semiconductor element, a control unit that controls the semiconductor element, the first switch, and the second switch, and the AC power to the load. There is a power supply control device that starts and shuts off the supply of the power supply, the load includes a plurality of electric devices that are input in synchronization with each other, and the addition result of each inrush current of the plurality of electric devices is the result of the power supply control device. When the allowable value of the inrush current is exceeded, the inrush current suppression device is provided between the power supply control device and the load, and the control unit starts supplying power to the load. In addition, from the state in which both the first switch and the second switch are shut off, (1) the first control switch is put into a conductive state and the first control signal instructing the semiconductor element to be in a conductive state is output. Next, (2) is a control method for suppressing the inrush current to the load by making the second switch in a conductive state after a predetermined time.

According to the present invention, the inrush current can be suppressed without using the variable impedance that allows the current flowing through the load to flow.

It is a figure which shows the structural example of the electric power control system which concerns on one Embodiment of this invention. It is a figure which shows the setting state of the input / output port I / O (1) to I / O (4) of the controller 11 shown in FIG. It is a figure which shows the operation example of the inrush current suppression apparatus 10 shown in FIG. It is a figure which shows the control sequence at the time of starting the power supply of the inrush power suppression apparatus 10 shown in FIG. It is a figure which shows the control sequence at the time of power supply cutoff of the inrush power suppression apparatus 10 shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration example of a power control system 1 according to an embodiment of the present invention. The power control system 1 shown in FIG. 1 includes an inrush power suppression device 10, a power supply control device 20, and an operation switch 30. The power control system 1 uses a single-phase AC power supply 2 such as a commercial power supply as a power source to control the start and cutoff of power supplied to the load 40. The load 40 includes, for example, a plurality of electric devices 41 that are input in synchronization with each other. The plurality of electric devices 41 are, for example, a plurality of lighting devices of the same type (LED lighting, etc.) connected in parallel to each other.

The operation switch 30 sets the electrical contact (switch) in a conductive state (on) or a cutoff state (off) according to the operation of the user. In the power control system 1, when the operation switch 30 is turned on, the power supply to the load 40 is instructed to start, and when the operation switch 30 is turned off, the power supply to the load 40 is cut off. The on or off state of the operation switch 30 is input to the terminal unit 22 via a predetermined signal line as an operation switch signal which is a binary signal representing on or off, for example. Alternatively, the on or off state of the operation switch 30 is transmitted to the terminal unit 22 as a wired or wireless communication signal via a signal transmission device (not shown). Further, the operation switch signal indicating the on or off state of the operation switch 30 is input from the operation switch 30 directly or via the terminal unit 22 or the like to the controller 11 of the inrush power suppression device 10.

The power supply control device 20 is a device that starts and cuts off the supply of the AC power output by the AC power supply 2 to the load 40. The power supply control device 20 includes an electromagnetic relay 21 and a terminal unit 22. The terminal unit 22 makes the electromagnetic relay 21 conductive or cut off depending on whether the operation switch 30 is on or off. At that time, when the electromagnetic relay 21 is turned off, the terminal unit 22 takes longer than the time from when the operation switch 30 is turned off until the inrush power suppression device 10 described later completes the process at the time of power cutoff. After waiting for a time, the electromagnetic relay 21 is turned off with a delay. In the electromagnetic relay 21, one end of the electrical contact is connected to the AC power supply 2 via wiring or the like, and the other end is connected to the input terminal 101 of the inrush power suppression device 10 via wiring or the like. The solenoid relay 21 has a switch (the above-mentioned electrical contact) that turns on or off according to the energization state of the electromagnetic part and the electromagnetic part, and energizes the electromagnetic part according to a predetermined control signal output by the terminal unit 22. Change the state and put the switch in a conductive state (on) or a cutoff state (off).

When the operation switch 30 changes from on to off, two types of operation switch signals having different standby times may be output from, for example, the operation switch 30. Then, the operation switch 30 supplies the one with the shorter standby time to the inrush power suppression device 10, and supplies the one with the longer standby time to the power supply control device 20. In this case, it is not necessary to provide a standby time when the electromagnetic relay 21 by the terminal unit 22 described above is cut off.

The inrush power suppression device 10 includes an electromagnetic relay RY1, a solid state relay SSR, a controller 11, a bypass circuit 12, a power supply unit 13, and an input unit 14.

The solenoid relay RY1 has a switch that turns on or off depending on the energized state of the electromagnetic part and the electromagnetic part, changes the energized state of the electromagnetic part according to the RY1 operation signal output by the controller 11, and makes the switch conductive. Or, it is in a cutoff state. Further, the switch of the electromagnetic relay RY1 is a make contact (normally open).

The solid-state relay SSR (semiconductor element) is a relay in which a switch is composed of semiconductor switching elements such as a thyristor, a triac, and a transistor, and has a zero-cross function. When an SSR operation signal indicating a conduction state or a cutoff state is input from the controller 11, the solid state relay SSR shifts the switch to the continuation state or the cutoff state in a predetermined phase of alternating current. The zero-cross function, on the one hand, turns on the switch when the transition to the conduction state is instructed, when the AC power supply voltage becomes zero or near zero, and on the other hand, when the transition to the cutoff state is instructed, the AC load current. It is a function to turn off the switch when becomes zero or near zero. According to this zero cross function, when the transition to the conduction state is instructed, the switch is turned on when the AC power supply voltage becomes zero or near zero, so that the inrush current to the load 40 can be suppressed, for example. .. Further, when the transition to the cutoff state is instructed, the switch is turned off when the AC load current becomes zero or near zero, so that the transient current change at the time of cutoff can be suppressed, for example, the surge voltage can be suppressed. ..

The electromagnetic relay RY1 and the solid state relay SSR are electrically connected in series. One end of the electromagnetic relay RY1 is connected to the input terminal 101 of the inrush power suppression device 10. The other end of the electromagnetic relay RY1 is connected to one end of the solid state relay SSR. The other end of the solid state relay SSR is connected to the output terminal 102 of the inrush power suppression device 10.

The bypass circuit 12 constitutes a circuit that bypasses the solid state relay SSR. The bypass circuit 12 includes an electromagnetic relay RY2. The solenoid relay RY2 has a switch that turns on or off depending on the energized state of the electromagnetic part and the electromagnetic part, changes the energized state of the electromagnetic part according to the RY2 operation signal output by the controller 11, and makes the switch conductive. Or, it is in a cutoff state. The switch of this electromagnetic relay RY2 is a make contact (normally open). Both ends of the electromagnetic relay RY2 are connected to the input terminal 101 and the output terminal 102 of the inrush power suppression device 10. In this case, the bypass circuit 12 is electrically connected in parallel to the electromagnetic relay RY1 and the solid state relay SSR connected in series. That is, in this case, the bypass circuit 12 is a circuit that bypasses the electromagnetic relay RY1 and the solid state relay SSR when the electromagnetic relay RY2 is in a conductive state. However, the bypass circuit 12 may be a circuit in which the electromagnetic relay RY2 is connected in parallel with the solid state relay SSR to bypass only the solid state relay SSR.

The power supply unit 13 transforms and rectifies AC power input from the AC power supply 2 via the power supply control device 20 and the input terminal 101, and supplies DC power of, for example, a plurality of types of voltage to each unit in the inrush power suppression device 10. Supply. The input unit 14 includes, for example, a semi-fixed variable resistor that can be changed by a user's operation, and outputs a signal having a voltage value corresponding to the resistance value set in the semi-fixed variable resistor to the controller 11. .. This semi-fixed variable resistor outputs a voltage value set by a user's operation, and does not allow a current flowing through the load 40 to flow. Alternatively, the input unit 14 includes a DIP switch having a plurality of setting switches, and outputs a signal indicating an on or off setting state of each setting switch to the controller 11. The power supply unit 13 may be connected to the AC power supply 2 via, for example, a circuit breaker (not shown) set in a conductive state, without going through the power supply control device 20.

The controller 11 is, for example, a microcomputer, and has a CPU (central processing unit), a storage device, an input / output device, an A / D (analog / digital) converter, and a D / A (digital / analog) converter inside. , Has hardware such as timers, counters, clocks, and communication devices. Further, the controller 11 has a plurality of digital signal input / output ports (input / output terminals) such as input / output ports I / O (1) to I / O (4), and analog signal input / output terminals. The controller 11 uses internal hardware, and the CPU executes a program such as predetermined firmware stored in the storage device to configure each function of the control unit 15, the adjustment unit 16, and the storage unit 17. ..

The controller 11 controls the solid state relay SSR, the electromagnetic relay RY1 and the electromagnetic relay RY2 according to the on or off state of the operation switch 30. At that time, the input / output ports I / O (1) to I / O (4) of the controller 11 are set as shown in FIG. FIG. 2 is a diagram showing a setting state and the like of the input / output ports I / O (1) to I / O (4) of the controller 11 shown in FIG.

As shown in FIG. 2, the input / output port I / O (1) is set to the input terminal (digital IN), and the operation switch 30 is turned on (switch ⇒ ON) at the H level (“H”) or L. The operation switch signal indicating the off state (switch ⇒ OFF) of the operation switch 30 is input at the level (“L”). The input / output port I / O (2) is set to the output terminal (digital OUT), and the switch of the relay RY1 is set to the conduction state (RY⇒ON) at the H level (“H”), and the L level (“L”). Outputs the RY1 operation signal that puts the switch of the relay RY1 in the cutoff state (RY⇒OFF). The input / output port I / O (3) is set to the output terminal, and at the H level (“H”), the solid state relay SSR is instructed to transition to the conduction state (SSR⇒ON), and the L level (“L”). ) Outputs an SSR operation signal instructing the solid state relay SSR to transition to the cutoff state (SSR⇒OFF). The input / output port I / O (4) is set to the output terminal, the switch of the relay RY2 is set to the conduction state (RY⇒ON) at the H level (“H”), and the relay RY2 is set at the L level (“L”). Outputs the RY2 operation signal that puts the switch in the cutoff state (RY⇒OFF).

The control unit 15 outputs the RY1 operation signal from the input / output port I / O (2) and the input / output port I / O (3) according to the operation switch signal input to the input / output port I / O (1). It controls each level of the SSR operation signal output from and the RY2 operation signal output from the input / output port I / O (4) and the timing at which each level is changed. The adjusting unit 16 adjusts the timing at which the control unit 15 changes the level of each signal according to, for example, a setting state for the input unit 14 by the user. The storage unit 17 stores a program such as firmware executed by the control unit 15, setting information of each timing, information indicating the adjustment content of the adjustment unit 16, and the like.

Next, an operation example of the inrush power suppression device 10 shown in FIG. 1 will be described with reference to FIGS. 3 to 5. FIG. 3 is a flowchart showing an operation example of the inrush current suppression device 10 shown in FIG. FIG. 4 is a diagram showing a control sequence at the start of power supply of the inrush power suppression device 10. FIG. 5 is a diagram showing a control sequence when the power supply of the inrush power suppression device 10 is cut off. In addition, in FIG. 4 and FIG. 5, the start time or the end time of the time T1 to T8 may be simply shown. That is, in FIGS. 4 and 5, even if there is a short time difference between the time t11 to t15 or the time t21 to t25 shown by the broken line and the start time or the end time of the time T1 to T8, they are represented as the same timing. Sometimes. Further, as an example, in the following description, it is assumed that the electric device 41 is a lighting device and the operation switch 30 is a lighting switch.

When the user turns on the operation switch 30 (lighting switch in this example) while the operation switch 30 is off, the operation switch signal changes from “L” (low level) to “H” (high level) (FIG. 3). Time t11). When the operation switch signal changes from "L" to "H", the terminal unit 22 puts the electromagnetic relay 21 in a conductive state. Then, the power supply unit 13 of the inrush power suppression device 10 starts to supply electric power to each unit. Here, after the controller 11 is activated and a predetermined initialization process or the like is executed, the adjusting unit 16 adjusts at least one of the times T1 to T8, which will be described later, according to the setting state of the input unit 14 as necessary. (Step S100). Next, the control unit 15 determines whether or not the level of the input / output port I / O (1) (hereinafter referred to as I / O (n); n is 1 to 4) is “H” (step S101). , When the I / O (1) is “L” (“No” in step S101), the determination process is repeated in a predetermined cycle. When the I / O (1) is “H” (“Yes” in step S101), the control unit 15 waits for T1 hours (“Yes” from the repetition of “No” in step S102), and then the I / O ( “H” is output from 2) (step S103, time t12). Here, the electromagnetic relay RY1 is turned on.

Next, the control unit 15 outputs “H” from the I / O (3) after waiting for T2 hours (“Yes” from the repetition of “No” in step S104) (step S105, time t13). After that, when the voltage of the AC power supply 2 becomes zero or near zero, the solid state relay SSR is switched on. At this time, the power supply from the AC power source 2 to the electric device 41 (lighting device in this example) is started, and the electric device 41 is turned on. In this case, the solid-state relay SSR is switched on when the AC power supply voltage becomes zero or near zero, so that the inrush current to the electric device 41 can be suppressed.

Next, the control unit 15 outputs “H” from the I / O (4) after waiting for T3 hours (“Yes” from the repetition of “No” in step S106) (step S107, time t14). Here, the electromagnetic relay RY2 is turned on. It is desirable to set this time T3 longer than the period from the start of energization of the load 40 until the inrush current accompanying the start of energization falls within a predetermined range.

Next, after waiting for T4 hours (“Yes” from the repetition of “No” in step S108), the control unit 15 outputs “L” from the I / O (2) and “L” from the I / O (3). Output "L" (step S109, time t15). Here, the electromagnetic relay RY1 is turned off and the solid state relay SSR is switched off. After that, it is possible to reduce the power consumed by the electromagnetic part of the electromagnetic relay RY1 in order to turn on the electromagnetic relay RY1.

Next, the control unit 15 determines whether or not the I / O (1) is “L” (step S110). When the I / O (1) becomes “L” (“Yes” in step S110, time t21 in FIG. 5), the control unit 15 waits for T5 hours (“Yes” from the repetition of “No” in step S111). ), “H” is output from the I / O (2), and “H” is output from the I / O (3) (step S112, time t22). Here, the electromagnetic relay RY1 is turned on, and the solid-state relay SSR is switched on when the voltage of the AC power supply 2 becomes zero or near zero.

Next, the control unit 15 outputs “L” from the I / O (4) after waiting for T6 hours (“Yes” from the repetition of “No” in step S113) (step S114, time t23). Here, the electromagnetic relay RY2 is turned off.

Next, the control unit 15 waits for T7 hours (“Yes” from the repetition of “No” in step S115), and then outputs “L” from the I / O (3) (step S116, time t24). Here, the solid-state relay SSR is switched off when the current of the load 40 becomes zero or near zero. Here, the power supply from the AC power source 2 to the electric device 41 (lighting device in this example) is cut off, and the electric device 41 is turned off. In this case, since the switch of the solid-state relay SSR is turned off when the AC load current becomes zero or near zero, it is possible to suppress the transient current change at the time of interruption, for example, to suppress the surge voltage.

Next, the control unit 15 outputs “L” from the I / O (2) after waiting for T8 hours (“Yes” from the repetition of “No” in step S117) (step S118, time t25). Here, the electromagnetic relay RY1 is turned off.

As described above, the inrush current suppression device 10 of the present embodiment can suppress the inrush current without using variable impedance.

The time interval for the switch on / off operation can be set according to the response time of each switch. For example, considering that the response time of the solid state relay SSR is about 10 ms and the response time of the electromagnetic relays RY1 and RY2 is about 20 ms, after a time longer than the response time of the one selected from them has elapsed. , It is desirable to control to perform the following switch operations. Each time T1 to T8 can be, for example, about 0.2 seconds.

Further, in the present embodiment, an electromagnetic relay RY2 connected in parallel is installed, and this is provided in the bypass circuit 12. After the switch is turned on by the zero cross function of the solid state relay SSR, until the operation of cutting off the power supply, the solid state relay SSR The bypass circuit 12 is used instead of. Therefore, it is possible to reduce the power loss due to heat generation by the solid state relay SSR and the heat load on the electronic circuit.

Further, when the electric device 41, which is a lighting device such as LED lighting, establishes a lighting state by the bypass circuit 12, the solid state relay SSR is further turned off by turning off the switches of the electromagnetic relay RY1 and the solid state relay SSR. It is possible to reduce the power loss due to the base current to the current and the exciting current of the electromagnetic part of the electromagnetic relay RY1.

This embodiment is a hybrid electronic control switch controlled by a microcomputer or the like that combines an electromagnetic relay RY1 and a zero-cross input type solid-state relay SSR, and can significantly suppress an inrush current when lighting an LED lighting or the like. (For example, about 1/10).

In addition, since the inrush current can be suppressed by the hybrid electronic control switch of this embodiment, the number of lights that can be connected to one switch (switch such as electromagnetic relay 21) is greatly increased, and the cost of goods and construction is increased. Can be reduced.

In addition, for example, since the inrush current of LED lighting can be suppressed by a switch, a commercially available LED lighting with a relatively large inrush current should be introduced into a room where consideration for interfering electromagnetic waves is important, such as a communication machine room or server equipment. It has become possible to reduce the initial cost and running cost of lighting equipment.

Each switch controlled in this embodiment (solid-state relay SSR switch, electromagnetic relay RY1 switch, and electromagnetic relay RY2 switch (hereinafter, the same)) has, for example, a combination of the following three switches. The time lag from each control signal input of the SSR operation signal, the RY1 operation signal, and the RY2 operation signal to the operation can be set as follows.

The operation response time of the semiconductor switch (for example, triac) of the solid state relay SSR is several μs (however, the zero cross type is several ms to 10 ms). Further, when the electromagnetic relays RY1 and RY2 are general electromagnetic relays, the operation response time is about 50 ms. Further, when the electromagnetic relays RY1 and RY2 are operated by external electric operation of the breaker, the operation response time is 0.1 seconds to several seconds. Allows you to change the time lag to switch operation so that it can be applied to these switch combinations. For example, when used for ON control of an LED switch, if the time lag until the switch operates is shorter than the longest operation response time of the combined switch operation response times, the switches may not operate in the intended order. There is. Therefore, it is desirable that the time lag of this switch control can be adjusted by the adjusting unit 16. For example, in the input unit 14, a voltage dividing signal due to a variable resistor is input to the controller 11 as an analog voltage signal, and the time lag is controlled by the firmware so that the time lag can be adjusted by changing the resistance value. Can be changed, and the switches can be operated in the intended order.

In the inrush power suppression device 10 of the present embodiment, the start point or end point of each standby time is set to, for example, when a change in each operation signal for each switch is detected, or the power supply of each switch (DC after rectification). It may be controlled at the time when a predetermined change in voltage) is detected.

Further, at the time of turning on, the period until the selection of the bypass circuit 12 is started (time T3 in FIG. 4) is required from the history information by recording the fluctuation of the past actual results (power supply current or power supply voltage) in the history. You may select a period and set it to that time.

In addition, this embodiment has the following aspects, for example.

[1] That is, the inrush power suppression device 10 suppresses the inrush current when starting the supply of AC power to the load 40 that consumes AC power. Further, the inrush power suppression device 10 is a solid state relay SSR that transitions to a conduction state or a cutoff state in a predetermined phase of AC when an SSR operation signal (first control signal) indicating a continuity state or a cutoff state is input. (Semiconductor element), electromagnetic relay RY1 (first switch) electrically connected in series to the solid state relay SSR, and electromagnetic relay RY2 (second switch) arranged in the bypass circuit 12 that bypasses the solid state relay SSR. A switch), a solid state relay SSR, an electromagnetic relay RY1, and a control unit 15 for controlling the electromagnetic relay RY2. Then, when the control unit 15 starts supplying electric power to the load 40, the electromagnetic relay RY1 and the electromagnetic relay RY2 are both cut off, and (1) the electromagnetic relay RY1 is brought into a conductive state and is in a solid state. An SSR operation signal instructing the continuity state is output to the relay SSR, and then (2) after a predetermined time T3, the electromagnetic relay RY2 is brought into the continuity state.

According to this aspect, the inrush current can be suppressed without using the variable impedance.

[2] The bypass circuit 12 may be electrically connected to the electromagnetic relay RY1 (first switch) and the solid state relay SSR (semiconductor element) connected in series so as to be electrically parallel to each other.

According to this aspect, the electromagnetic relay RY1 can be cut off by making the bypass circuit 12 in a conductive state at the time of power supply. Therefore, the operation loss of the electromagnetic relay RY1 can be eliminated.

[3] Further, when the control unit 15 starts supplying power to the load 40, the electromagnetic relay RY1 and the electromagnetic relay RY2 are both cut off, and (1) the electromagnetic relay RY1 is brought into a conductive state. At the same time, an SSR operation signal instructing the solid state relay SSR to be in a conductive state is output, then (2) after a predetermined time T3, the electromagnetic relay RY2 is put into a conductive state, and (3) after a predetermined time T4. , The electromagnetic relay RY1 may be put into a cutoff state, and an SSR operation signal indicating the cutoff state may be output to the solid state relay SSR.

According to this aspect, the operation loss of the solid state relay SSR and the electromagnetic relay RY1 can be reduced after a predetermined time when the bypass circuit 12 is in a conductive state.

[4] Further, when the control unit 15 cuts off the supply of power to the load 40, from the control state in which the electromagnetic relay RY2 is in the conductive state and the electromagnetic relay RY1 and the solid state relay SSR are in the cutoff state, (4). The electromagnetic relay RY1 is put into a conductive state, and an SSR operation signal instructing the solid state relay SSR to be in a conductive state is output. Next, (5) after a predetermined time T6, the electromagnetic relay RY2 is turned off, and then , (6) After a predetermined time T7, an SSR operation signal instructing the solid state relay SSR to be in a cutoff state is output, and then (7) after a predetermined time T8, the electromagnetic relay RY1 is turned off. You may do it.

According to this aspect, since the switch is turned off when the AC load current becomes zero or near zero, the transient current change at the time of interruption can be suppressed, and for example, the surge voltage can be suppressed.

[5] Further, the predetermined time T3 of the above (2) from the output of the SSR operation signal instructing the solid state relay SSR to the conduction state by the control unit 15 to the conduction state of the electromagnetic relay RY2 is set. It is desirable to set the period longer than the period from the start of energization of the load 40 until the inrush current accompanying the start of energization falls within a predetermined range. Further, the inrush current suppression device 10 can further include an adjusting unit 16 that can adjust at least one of the predetermined times from the outside.

[6] Further, the power control system 1 according to the embodiment of the present invention is a power supply control device that starts and cuts off the supply of AC power to the inrush power suppression device 10 and the load 40 described in [1] to [5] above. 20 and. Here, the load 40 includes a plurality of electric devices 41 that are input in synchronization with each other. According to the present embodiment, even if the addition result of each inrush current of the plurality of electric devices 41 exceeds the permissible value of the inrush current of the power supply control device 20, for example, the inrush power suppression device 10 can be used with the power supply control device 20. By providing the device between the load 40 and the load 40 to suppress the inrush current to the load 40, the power supply control device 20 can be operated safely.

[7] Even when the plurality of electric devices 41 are a plurality of lighting devices of the same type (for example, LED lighting) connected in parallel to each other, the inrush current can be sufficiently suppressed.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes designs and the like within a range that does not deviate from the gist of the present invention.

1 ... Power control system 2 ... AC power supply 10 ... Inrush power suppression device 11 ... Controller 12 ... Bypass circuit 13 ... Power supply unit 14 ... Input unit 15 ... Control unit 16 ... Adjustment unit 17 ... Storage unit 20 ... Power supply control device 30 ... Operation Switch 40 ... Load 41 ... Electrical equipment RY1, RY2, 21 ... Electromagnetic relay SSR ... Solid state relay

Claims (8)

It is an inrush power suppression device that suppresses the inrush current when starting the supply of AC power to a load that consumes AC power.
When the first control signal indicating the conduction state or the cutoff state is input, the semiconductor element that transitions to the continuation state or the cutoff state in a predetermined phase of alternating current and
A first switch electrically connected in series to the semiconductor element,
A second switch arranged in a bypass circuit that bypasses the semiconductor element,
A control unit that controls the semiconductor element, the first switch, and the second switch ,
Equipped with
There is a power supply control device that starts and cuts off the supply of the AC power to the load.
The load includes a plurality of electrical appliances that are loaded synchronously with each other.
The addition result of each inrush current of the plurality of electric devices exceeds the permissible value of the inrush current of the power supply control device.
It is provided between the power supply control device and the load, and is provided.
When the control unit starts supplying power to the load, from the state in which both the first switch and the second switch are cut off, (1) the first switch is brought into a conductive state and the said. The first control signal instructing the conduction state to the semiconductor element is output, and then (2) after a predetermined time, the second switch is brought into the conduction state to suppress the inrush current to the load. do,
Inrush power suppression device. The inrush power suppression device according to claim 1, wherein the bypass circuit is connected to the first switch and the semiconductor element connected in series so as to be electrically parallel to each other. When the control unit starts supplying power to the load, from the state in which both the first switch and the second switch are cut off, (1) the first switch is brought into a conductive state and the said. The first control signal instructing the conduction state to the semiconductor element is output, then, after (2) a predetermined time, the second switch is put into the conduction state, and (3) after a predetermined time, the said. The inrush power suppression device according to claim 2, wherein the first switch is put into a cutoff state and the first control signal for instructing the semiconductor element of the cutoff state is output. When the control unit cuts off the supply of power to the load, the control unit changes from a control state in which the first switch and the semiconductor element are cut off while the second switch is in a conductive state to (4) the first switch. The first control signal for instructing the continuity state is output to the semiconductor element, and then (5) after a predetermined time, the second switch is turned off, and then ( 6) After a predetermined time, the first control signal instructing the semiconductor element of the cutoff state is output, and then (7) after the predetermined time, the first switch is put into the cutoff state. Or the inrush power suppression device according to 3. The predetermined time of (2) from the time when the control unit outputs the first control signal instructing the semiconductor element to the conduction state until the second switch is brought into the conduction state is to the load. It is set longer than the period from the start of energization until the inrush current that accompanies it falls within the specified range.
The inrush power suppression device according to any one of claims 1 to 4, further comprising an adjusting unit that allows at least one of the predetermined times to be adjusted from the outside. The inrush current suppression device according to any one of claims 1 to 5.
A power supply control device that starts and cuts off the supply of the AC power to the load, and
Power control system with. The power control system according to claim 6, wherein the plurality of electric devices are a plurality of lighting devices of the same type in which the plurality of electric devices are connected in parallel to each other. It is a control method of the inrush power suppression device that suppresses the inrush current when starting the supply of AC power to the load that consumes AC power.
The inrush current suppression device
When the first control signal indicating the conduction state or the cutoff state is input, the semiconductor element that transitions to the continuation state or the cutoff state in a predetermined phase of alternating current and
A first switch electrically connected in series to the semiconductor element,
A second switch arranged in a bypass circuit that bypasses the semiconductor element,
A control unit for controlling the semiconductor element, the first switch, and the second switch is provided.
There is a power supply control device that starts and cuts off the supply of the AC power to the load.
The load includes a plurality of electrical appliances that are loaded synchronously with each other.
The addition result of each inrush current of the plurality of electric devices exceeds the permissible value of the inrush current of the power supply control device.
The inrush current suppression device is provided between the power supply control device and the load.
When the control unit starts supplying power to the load, the first switch and the second switch are both cut off, and then (1) the first switch is made conductive and the first switch is made conductive. The first control signal instructing the conduction state to the semiconductor element is output, and then (2) after a predetermined time, the second switch is brought into the conduction state to suppress the inrush current to the load. ,
Control method.

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