JP2019102338A - Rush power suppression device, power control system, and control method - Google Patents

Abstract

To suppress a rush current without using a variable impedance for flowing a current flowed in a load.SOLUTION: A rush power suppression device comprises: a semiconductor element transited to a conduction state or a cut-off state in a prescribed AC phase when a first control signal indicating the conduction state or the cut-off state is input; a first switch electrically connected to the semiconductor element in series; a second switch arranged in a bypass circuit bypassing the semiconductor element; and a control part controlling the semiconductor element, the first switch, and the second switch. The control part controls so that when starting the supply of a power in response to the load, a cut-off state of the first and second switches is transited to a conductive state of (1) the first switch, the first control signal instructing the conductive state to the semiconductor element is output, and sequentially, the second switch is set to the conductive state after (2) a predetermined time.SELECTED DRAWING: Figure 1

Description

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

  In the switch of the lighting equipment, the contact type is generally used because of the advantages of good insulation performance, low cost and high availability. These include a rocker switch for manual operation and an electromagnetic relay for external control.

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

  When a large inrush current flows in the switch when the switch such as the LED lighting is turned on, problems such as welding of the contact of the switch, noise generation, and deterioration of the semiconductor component may occur. In order to prevent such a problem, the number of LED lights supplied with power from one switch may be limited to a number much smaller than the allowable current of the switch. In this case, since the number of switches required for lighting increases, there is a problem that leads to an increase in the cost of goods and construction. For example, in the electromagnetic relay, the TV rating is specified separately from the rated current in the supply to the inrush current load, and the usage range of the inrush current upper limit value and the steady current is separately specified for each category of the TV rating There is. The TV rating is one of the representative ratings that evaluates the inrush current performance among 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 the inrush current as described above. In the switchgear described in Patent Document 1, a bypass circuit consisting of a series circuit of a variable impedance and an auxiliary switch is connected in parallel with the main switch. When the circuit is closed, first, the auxiliary switch is 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 the circuit is opened, the main switch is first opened, then the variable impedance impedance is changed from low to high, and then the auxiliary switch is opened. According to this configuration, the change in impedance can be made gentle at the time of opening and closing, and for example, rush current can be suppressed. The variable impedance described in Patent Document 1 is configured by connecting in series a plurality of pairs of resistances and a pair of thyristors in opposite directions connected in parallel to the resistances.

Unexamined-Japanese-Patent No. 4-82119

  As described above, in the switchgear described in Patent Document 1, the variable impedance that causes the current flowing to the load is configured using a plurality of resistors. Therefore, there is a problem that the size of the resistor may be increased or special cooling may be required depending on the magnitude of the current to be switched.

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

  In order to solve the above-mentioned subject, one mode of the present invention is a rush power control device which controls rush current at the time of starting supply of alternating current power to load which consumes alternating current power, and is in a conducting state or a blocking state A semiconductor element that transits to a conducting state or a blocking state at a predetermined phase of alternating current when a first control signal instructing the input is inputted, a first switch electrically connected in series to the semiconductor element, and the semiconductor A second switch disposed in a bypass circuit that bypasses the element; and a control unit that controls the semiconductor element, the first switch, and the second switch, the control unit being configured to transmit power to the load When starting supply, from the state in which both the first switch and the second switch are disconnected, (1) the first switch is made conductive and the conductive state is made with respect to the semiconductor element It outputs the first control signal for instructing, then (2) after a predetermined time, a rush power suppression device for the second switch conductive.

  In the rush power suppression device according to the above aspect, the bypass circuit is electrically connected in parallel to the first switch and the semiconductor element connected in series.

  In the inrush power suppression apparatus according to the above aspect, when the control unit starts supplying power to the load, the first switch and the second switch are both shut off (1) The first switch is turned on and the first control signal instructing the semiconductor element to be turned on is output, and then (2) the second switch is turned on after a predetermined time, (3) After a predetermined time, the first switch is turned off and the first control signal is output to instruct the semiconductor element to turn off.

  In the rush power suppression device according to 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 disconnected state. From the control state, (4) turning on the first switch and outputting the first control signal instructing the semiconductor element to turn on, and (5) after a predetermined time, (2) After the predetermined time, output the first control signal instructing the semiconductor element to be in the cut-off state, and (7) after the predetermined time, Put the first switch in the closed state.

  In the rush power suppression device according to the above aspect, the control unit outputs the first control signal that instructs the semiconductor element to be in a conductive state, and then the second switch is brought into a conductive state. The predetermined time of 2) is set to be longer than a period from when energization to the load is started until the inrush current accompanying it falls within a predetermined range. It further comprises an adjustment unit that allows at least one to be adjusted from the outside.

  Further, according to one aspect of the present invention, there is provided a power supply control device for starting and interrupting supply of the alternating current power to the load, wherein the plurality of loads are applied in synchronization with each other. And the addition result of each inrush current of the plurality of electric devices exceeds the allowable value of the inrush current of the power supply control device, and the inrush power suppression device includes the power supply control device and the load. Power control system for suppressing inrush current to the load.

  In the power control system according to the above aspect, the plurality of electrical devices are a plurality of lighting devices of the same type connected in parallel to one another.

  Further, one aspect of the present invention is a control method of an inrush power suppression device that suppresses inrush current when starting supply of AC power to a load that consumes AC power, the inrush power suppression device being A semiconductor element that transitions to the conduction state or the interruption state at a predetermined phase of alternating current when a first control signal instructing the conduction state or the interruption state is input, and a first electrically connected to the semiconductor element in series The load includes a switch, a second switch disposed in a bypass circuit that bypasses the semiconductor element, and a control unit that controls the semiconductor element, the first switch, and the second switch, and the control unit When the supply of power is started, the first switch and the second switch are both cut off, and (1) the first switch is made conductive and the semiconductor It outputs the first control signal instructing the conduction state to the element, then, is (2) after a predetermined time, the control method of the second switch conductive.

  According to the present invention, it is possible to suppress inrush current without using a variable impedance for causing current to flow to a load.

It is a figure showing an example of composition of a power control system concerning one embodiment of the present invention. It is a figure which shows the setting state of input-output port I / O (1)-I / O (4) of the controller 11 shown in FIG. It is a figure which shows the operation example of the rush electric power control apparatus 10 shown in FIG. It is a figure which shows the control sequence at the time of the electric power supply start of the rush electric power control apparatus 10 shown in FIG. It is a figure which shows the control sequence at the time of electric power supply interruption | blocking of the rush electric power control 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 a rush power suppression device 10, a power supply control device 20, and an operation switch 30. The power control system 1 uses a single-phase alternating current power supply 2 such as a commercial power supply as a power supply to control the supply start and cut-off of power supplied to the load 40. The load 40 includes, for example, a plurality of electrical devices 41 which are synchronously input with one another. The plurality of electrical devices 41 are, for example, a plurality of lighting devices of the same type (such as LED lighting) connected in parallel to one another.

  The operation switch 30 turns the electrical contact (switch) on (on) or off (off) according to the user's operation. In the power control system 1, when the operation switch 30 is turned on, the load 40 is instructed to start supplying power, and when the operation switch 30 is turned off, it is instructed to shut off the power to the load 40. 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, for example, a binary signal representing on or off. 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). In addition, an operation switch signal indicating the on or off state of the operation switch 30 is input from the operation switch 30 directly to the controller 11 of the rush power suppression device 10 via the terminal unit 22 or the like.

  The power supply control device 20 is a device that starts and shuts off the supply of the AC power output from 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 turns on or off the electromagnetic relay 21 according to the on or off state of the operation switch 30. At that time, when the terminal unit 22 turns off the electromagnetic relay 21, it takes longer than the time for the inrush power suppression device 10 described later to complete the processing at the time of power interruption after the operation switch 30 is turned off. After waiting for a period of time, the electromagnetic relay 21 is put into a disconnected state after a delay. The electromagnetic relay 21 connects one end of the electrical contact to the AC power supply 2 via a wire or the like, and connects the other end to the input terminal 101 of the rush power suppression device 10 via the wire or the like. The electromagnetic relay 21 has a switch (the above-mentioned electrical contact) which is turned on or off in accordance with the conduction state of the electromagnetic unit and the electromagnetic unit, and the energization of the electromagnetic unit is performed according to a predetermined control signal output from the terminal unit 22. Vary the state, turning the switch on (on) or off (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 the operation switch 30, for example. Then, the operation switch 30 supplies the shorter standby time to the rush power suppressing device 10 and the longer standby time to the power supply control device 20. In this case, the standby time may not be provided when the electromagnetic relay 21 is turned off by the terminal unit 22 described above.

  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 electromagnetic relay RY1 has a switch that is turned on or off in accordance with the energized state of the electromagnetic unit and the electromagnetic unit, changes the energized state of the electromagnetic unit in response to the RY1 operation signal output by the controller 11, and turns the switch on Or shut off. 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 formed by semiconductor switching elements such as thyristors, triacs, and transistors, and has a zero cross function. When an SSR operation signal instructing a conductive state or a cut-off state is input from the controller 11, the solid state relay SSR causes the switch to transition to the conductive state or the cut-off state with a predetermined phase of alternating current. The zero cross function, on the other hand, turns on the switch when the AC power supply voltage reaches zero or near zero when transition to a conducting state is instructed, and AC load current when transition to a blocking state is instructed. Is a function to turn off the switch when it becomes near zero or zero. According to this zero-cross function, when the transition to the conductive state is instructed, the switch is turned on when the AC power supply voltage reaches zero or near zero, so that, for example, rush current to the load 40 can be suppressed. . In addition, when the transition to the shutoff state is instructed, the switch is turned off when the AC load current reaches zero or near zero, so that the transient current change at the shutoff 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 RY 1 is connected to the input terminal 101 of the rush power suppressing apparatus 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 rush power suppressing apparatus 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 electromagnetic relay RY2 has a switch that is turned on or off in response to the energized state of the electromagnetic unit and the electromagnetic unit, changes the energized state of the electromagnetic unit in response to the RY2 operation signal output by the controller 11, and turns on the switch. Or shut off. The switch of this electromagnetic relay RY2 is a make contact (normally open). Both ends of the electromagnetic relay RY 2 are connected to the input terminal 101 and the output terminal 102 of the rush power suppressing 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 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 that connects the electromagnetic relay RY2 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 through the power supply control device 20 and the input terminal 101, and DC power of a plurality of types of voltages is Supply. The input unit 14 includes, for example, a semi-fixed variable resistor that can be changed by a user 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 . The semi-fixed variable resistor outputs the voltage value set by the user's operation, and does not flow the current flowing to the load 40. Alternatively, the input unit 14 includes a dip switch having a plurality of setting switches, and outputs a signal indicating the setting state of each setting switch to on or off to the controller 11. The power supply unit 13 may be connected to the AC power supply 2 without the power supply control device 20 via, for example, a circuit breaker (not shown) set in a conductive state.

  The controller 11 is, for example, a microcomputer (microcomputer), and internally has a CPU (central processing unit), a storage device, an input / output device, an A / D (analog / digital) converter, a D / A (digital / analog) converter , Timer, counter, clock, communication device, etc. The controller 11 also has input / output ports (input / output terminals) of a plurality of digital signals such as input / output ports I / O (1) to I / O (4), and an input / output terminal for analog signals. The controller 11 configures each function of the control unit 15, the adjustment unit 16, and the storage unit 17 by the CPU executing programs such as predetermined firmware stored in the storage device using internal hardware. .

  The controller 11 controls the solid state relay SSR, the electromagnetic relay RY1 and the electromagnetic relay RY2 in accordance with the on or off state of the operation switch 30. At this time, 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 setting states of 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 H level ("H") turns on (switch ON ON) the operation switch 30 or L At the level (“L”), an operation switch signal indicating an off (switch → off) state of the operation switch 30 is input. The input / output port I / O (2) is set to the output terminal (digital OUT), and the H level ("H") turns on the switch of the relay RY1 (RY ON ON), L level ("L") The RY1 operation signal for setting the switch of the relay RY1 to the cut off state (RY⇒OFF) is output. The input / output port I / O (3) is set to the output terminal, and at the H level ("H"), instructs the solid state relay SSR to transition to the conductive state (SSR) ON), and the L level ("L") ) Outputs an SSR operation signal that instructs 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, and the H level ("H") turns on the switch of the relay RY2 (RY ON ON), and the L level ("L") turns on the relay RY2. Output the RY2 operation signal to turn off the switch (RY OFF OFF).

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

  Next, with reference to FIGS. 3 to 5, an operation example of the rush power suppressing apparatus 10 shown in FIG. 1 will be described. FIG. 3 is a flow chart showing an operation example of the rush power suppressing apparatus 10 shown in FIG. FIG. 4 is a diagram showing a control sequence at the start of power supply of inrush power suppression apparatus 10. FIG. 5 is a diagram showing a control sequence at the time of power supply interruption of the rush power suppression device 10. As shown in FIG. In addition, in FIG. 4 and FIG. 5, the start time or finish time of time T1-T8 may be simply shown. That is, in FIG. 4 and FIG. 5, even when there is a short time lag between time t11 to t15 or time t21 to t25 indicated by the broken line and the start time or end time of time T1 to T8, they are represented as the same timing. Sometimes. Further, as an example, in the following description, 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 (in this example, the illumination switch) 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 turns on the electromagnetic relay 21. Then, the power supply unit 13 of the rush power suppressing apparatus 10 starts to supply power to each unit. Here, after the controller 11 is activated and executes predetermined initialization processing and the like, the adjusting unit 16 adjusts at least one of times T1 to T8 described later according to the setting state of the input unit 14 as necessary. (Step S100). Next, the control unit 15 determines whether the level of the input / output port I / O (1) (hereinafter referred to as I / O (n), where n is 1 to 4) is “H” (step S101). If I / O (1) is "L" ("No" in step S101), the determination process is repeated at a predetermined cycle. If the I / O (1) is “H” (“Yes” in step S101), the control unit 15 waits for T1 time (“Yes” after repeating “No” in step S102), and then performs I / O ( 2) to "H" is output (step S103, time t12). Here, the electromagnetic relay RY1 is turned on.

  Next, after waiting for a time T2 ("Yes" after repeating "No" in step S104), the control unit 15 outputs "H" from the I / O (3) (step S105, time t13). After that, the switch of the solid state relay SSR is turned on when the voltage of the AC power supply 2 becomes zero or near zero. At this time, the power supply from the AC power supply 2 to the electric device 41 (in this example, the lighting device) is started, and the electric device 41 is turned on. In this case, since the switch is turned on when the AC power supply voltage reaches zero or near zero, the solid state relay SSR can suppress inrush current to the electric device 41.

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

  Next, after waiting for T4 time (Yes in step S108 after repeating "No" in step S108), the control unit 15 outputs "L" from the I / O (2) and "I / O (3)". L "is output (step S109, time t15). Here, the electromagnetic relay RY1 is turned off and the switch of the solid state relay SSR is turned off. Thereafter, the power consumed by the electromagnetic unit of the electromagnetic relay RY1 can be reduced to turn on the electromagnetic relay RY1.

  Next, the control unit 15 determines whether the I / O (1) is “L” (step S110). If I / O (1) becomes "L" ("Yes" in step S110, time t21 in FIG. 5), the control unit 15 waits for T5 time ("No" in "No" in step S111) And “H” from I / O (2) and “H” from I / O (3) (step S112, time t22). Here, when the electromagnetic relay RY1 is turned on and the voltage of the AC power supply 2 becomes zero or near zero, the switch of the solid state relay SSR is turned on.

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

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

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

  As described above, the inrush power suppression apparatus 10 according to the present embodiment can suppress inrush current without using a variable impedance.

  In addition, the time interval of 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 one selected from them has elapsed It is desirable to control to perform the next switch operation. Each time T1 to T8 can be, for example, about 0.2 seconds.

  Further, in the present embodiment, the electromagnetic relay RY2 connected in parallel is provided, provided in the bypass circuit 12, and after the switch is turned on by the zero cross function of the solid state relay SSR, the solid state relay SSR is performed before the operation to cut off the power supply. Use bypass circuit 12 instead of. Therefore, it is possible to reduce the power loss due to the heat generation by the solid state relay SSR and the heat load on the electronic circuit.

  In addition, 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 and the excitation current of the electromagnetic unit of the electromagnetic relay RY1.

  The present embodiment is a hybrid electronic control switch by control of a microcomputer etc. combining an electromagnetic relay RY1 and a solid state relay SSR of a zero cross closing type, and it is possible to significantly suppress rush current at the time of lighting of LED lighting etc. (For example, about 1/10).

  Further, in the hybrid electronic control switch of this embodiment, since the rush current can be suppressed, the number of lights that can be connected per switch (switches such as the electromagnetic relay 21) is significantly increased, and the cost of goods and construction is increased. It became possible to reduce

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

  The switches (the switch of the solid state relay SSR, the switch of the electromagnetic relay RY1, and the switch of the electromagnetic relay RY2 (hereinafter the same)) controlled in this embodiment include, for example, combinations of the following three switches: The time lags from the respective control signal inputs 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 microseconds (however, however, the zero cross type is several ms to 10 ms). When the electromagnetic relays RY1 and RY2 are general electromagnetic relays, the operation response time is about 50 ms. Moreover, when making electromagnetic relay RY1 and RY2 into external motor operation of a breaker, operation | movement response time will be 0.1 second-several second. It is possible to change the time lag to the operation of the switch so that it can be applied to the combination of these switches. For example, in the case of using the LED switch for closing control, if the time lag until the operation of the switch is shorter than the longest operation response time among the operation response times of the combined switch, the switches may not operate in the intended order There is. Therefore, it is desirable that the time lag of this switch control be adjustable by the adjustment unit 16. For example, the input section 14 is input to the controller 11 as an analog voltage signal by a voltage division signal by a variable resistor or the like, and controlled by firmware so that the time lag can be adjusted by a change in resistance value. Can be varied, and switch operations can be performed in the intended order.

  The rush power suppressing apparatus 10 according to the present embodiment sets the start point or the end point of each standby time to, for example, a time point at which a change in each operation signal for each switch is detected. Control may be performed at the time of detection of a predetermined change in voltage).

  In addition, at the time of turning on, the period until time when selection of the bypass circuit 12 is started (time T3 in FIG. 4) leaves the fluctuation of the past performance (power supply current or power supply voltage) in the history and is required from the history information A period may be selected and set to that time.

  The present embodiment has, for example, the following aspect.

  [1] That is, the rush power suppressing apparatus 10 suppresses the rush current when starting the supply of AC power to the load 40 that consumes AC power. In addition, inrush power suppression device 10 is a solid state relay SSR that transitions to the conduction state or the interruption state at a predetermined phase of alternating current when an SSR operation signal (first control signal) instructing the conduction state or the interruption state is input. (Semiconductor element), an electromagnetic relay RY1 (first switch) electrically connected in series to the solid state relay SSR, and an electromagnetic relay RY2 (second one) disposed in the bypass circuit 12 bypassing the solid state relay SSR And a control unit 15 for controlling the solid state relay SSR, the electromagnetic relay RY1, and the electromagnetic relay RY2. Then, when the supply of power to the load 40 is started, the control unit 15 changes the state in which both the electromagnetic relay RY1 and the electromagnetic relay RY2 are cut off, and An SSR operation signal instructing a conductive state is output to the relay SSR, and then (2) after a predetermined time T3, the electromagnetic relay RY2 is made conductive.

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

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

  According to this aspect, the electromagnetic relay RY1 can be brought into the cut-off state by bringing the bypass circuit 12 into conduction when supplying power. Therefore, the operation loss of the electromagnetic relay RY1 can be eliminated.

  [3] In addition, when the supply of power to the load 40 is started, the control unit 15 causes (1) the electromagnetic relay RY1 to be in a conductive state from a state in which both the electromagnetic relay RY1 and the electromagnetic relay RY2 are disconnected. At the same time, an SSR operation signal instructing the conductive state to the solid state relay SSR is output, and (2) after a predetermined time T3, the electromagnetic relay RY2 is made conductive, and (3) after the predetermined time T4 The electromagnetic relay RY1 may be turned off and an SSR operation signal may be output to instruct the solid state relay SSR to turn off.

  According to this aspect, it is possible to reduce the operation loss of the solid state relay SSR and the electromagnetic relay RY1 after a predetermined time when the bypass circuit 12 is made conductive.

  [4] In addition, when the control unit 15 cuts off the supply of power to the load 40, the control unit 15 sets the electromagnetic relay RY2 in the conductive state and the electromagnetic relay RY1 and the solid state relay SSR in the disconnected state from the control state (4) The electromagnetic relay RY1 is turned on and an SSR operation signal instructing the solid state relay SSR to be turned on is output, and then (5) the electromagnetic relay RY2 is turned off after a predetermined time T6, and then (6) After a predetermined time T7, output an SSR operation signal instructing the solid state relay SSR to shut off, and then (7) turn off the electromagnetic relay RY1 after a predetermined time T8. You may

  According to this aspect, since the switch is turned off when the AC load current reaches zero or near zero, it is possible to suppress a change in transient current at the time of cutoff, for example, to suppress a surge voltage.

  [5] Further, the control unit 15 outputs the SSR operation signal instructing the solid state relay SSR to the conductive state, and then the predetermined time T3 of the above (2) until the electromagnetic relay RY2 is made conductive, It is desirable to set the time longer than the time until the inrush current associated with the start of current supply to the load 40 falls within a predetermined range. In addition, rush power suppression device 10 can further include adjustment unit 16 that allows at least one of the predetermined times to be adjusted from the outside.

  [6] Further, the power control system 1 according to the embodiment of the present invention is a feed control device for starting and interrupting the supply of AC power to the inrush power suppressing device 10 of the above [1] to [5] and the load 40. And 20. Here, the load 40 includes a plurality of electrical devices 41 which are synchronously input to 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 allowable value of the inrush current of the power supply control device 20, for example, the inrush power suppression device 10 can be replaced by the power supply control device 20. The feed control device 20 can be operated safely by suppressing the inrush current to the load 40 by providing the load control device 20 between the power supply control device 20 and the load 40.

  [7] The rush current can be sufficiently suppressed even when the plurality of electric devices 41 are the same kind of lighting devices (for example, LED lights) connected in parallel to each other.

  The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and includes design and the like within the scope of the present invention.

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

Claims (8)

An inrush power suppression device that suppresses inrush current when starting supply of AC power to a load that consumes AC power,
A semiconductor element which transits to a conducting state or a blocking state at a predetermined phase of alternating current when a first control signal instructing the conducting state or the blocking state is input;
A first switch electrically connected in series to the semiconductor element;
A second switch disposed in a bypass circuit that bypasses the semiconductor element;
A control unit configured to control the semiconductor element, the first switch, and the second switch;
When the control unit starts supplying power to the load, (1) the first switch is made conductive from the state in which the first switch and the second switch are both cut off. An inrush power suppression device, which outputs the first control signal instructing a semiconductor element to be in a conductive state, and then (2) puts the second switch into a conductive state after a predetermined time. The inrush power control device according to claim 1, wherein the bypass circuit is electrically connected in parallel to the first switch and the semiconductor element connected in series. When the control unit starts supplying power to the load, (1) the first switch is made conductive from the state in which the first switch and the second switch are both cut off. The first control signal instructing the semiconductor device to conduct is output, and (2) after a predetermined time, the second switch is rendered conductive, and (3) after the predetermined time The inrush power control device according to claim 2, wherein the first control signal for instructing the semiconductor element to be in the cut-off state is output while the first switch is in the cut-off state. When the control unit cuts off the supply of power to the load, from the control state in which the first switch and the semiconductor element are in the cut-off state with the second switch in the conductive state, (4) the first switch Is turned on and the first control signal instructing the semiconductor element to be turned on is output, and (5) after a predetermined time, the second switch is turned off and then 6) After a predetermined time, the first control signal for instructing the semiconductor device to be in the cutoff state is output, and (7) after the predetermined time, the first switch is in the cutoff state. Or the rush power control device according to 3. The predetermined time of (2) from when the control unit outputs the first control signal instructing the semiconductor element to the conduction state to when the second switch is brought into the conduction state is the load to the load. Is set longer than the period until the inrush current accompanying it is within the predetermined range after the start of
The rush power suppression device according to any one of claims 1 to 4, further comprising: an adjustment unit configured to adjust at least one of the predetermined times from the outside. The rush power suppression device according to any one of claims 1 to 5,
A feed control device for starting and stopping supply of the alternating current power to the load;
Equipped with
The load includes a plurality of electrical devices that are synchronously applied to each other,
The addition result of each inrush current of the plurality of electric devices exceeds the allowable value of the inrush current of the power supply control device,
The power control system, wherein the inrush power suppression device is provided between the power supply control device and the load to suppress inrush current to the load. The power control system according to claim 6, wherein the plurality of electric devices are a plurality of lighting devices of the same type connected in parallel to one another. A control method of an inrush power suppression apparatus, which suppresses inrush current when starting supply of AC power to a load that consumes AC power,
The rush power suppression device is
A semiconductor element which transits to a conducting state or a blocking state at a predetermined phase of alternating current when a first control signal instructing the conducting state or the blocking state is input;
A first switch electrically connected in series to the semiconductor element;
A second switch disposed in a bypass circuit that bypasses the semiconductor element;
A control unit configured to control the semiconductor element, the first switch, and the second switch;
When the supply of power to the load is started by the control unit, (1) the first switch is made conductive while the first switch and the second switch are both cut off. A control method of outputting the first control signal instructing a semiconductor element to be in a conductive state, and then (2) bringing the second switch into a conductive state after a predetermined time.

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