WO2022168335A1 - Circuit de prévention de courant d'appel et son procédé de commande - Google Patents

Circuit de prévention de courant d'appel et son procédé de commande Download PDF

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Publication number
WO2022168335A1
WO2022168335A1 PCT/JP2021/008407 JP2021008407W WO2022168335A1 WO 2022168335 A1 WO2022168335 A1 WO 2022168335A1 JP 2021008407 W JP2021008407 W JP 2021008407W WO 2022168335 A1 WO2022168335 A1 WO 2022168335A1
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WO
WIPO (PCT)
Prior art keywords
current
inrush
circuit
switch element
prevention
Prior art date
Application number
PCT/JP2021/008407
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English (en)
Japanese (ja)
Inventor
昌明 長野
智紀 渡邉
光平 谷野
弘佑 吉丸
昂祐 角
Original Assignee
オムロン株式会社
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Filing date
Publication date
Application filed by オムロン株式会社 filed Critical オムロン株式会社
Publication of WO2022168335A1 publication Critical patent/WO2022168335A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current

Definitions

  • the present invention relates to an inrush current prevention circuit used, for example, in a power supply device and a control method thereof.
  • power is transmitted from an AC power supply through a breaker to a circuit in which a plurality of N load devices such as electrical equipment are connected in parallel.
  • Patent Document 1 discloses a general inrush current prevention circuit.
  • the object of the present invention is to solve the above-mentioned problems by controlling a rush current exceeding a predetermined value even when a plurality of load devices are used, and preventing a current exceeding a predetermined value from flowing through the load devices.
  • An inrush current prevention circuit includes: An inrush current prevention circuit for preventing an inrush current from flowing from a power supply to a load device via a connection line, an inrush prevention resistor that is inserted into the connection line to reduce and flow a current when the load device is started; a switch element connected in parallel with the inrush prevention resistor; a current detector inserted into the connection line; a control circuit that controls on and off of the switch element based on the current value detected by the current detector; The control circuit controls to turn on the switch element when the current value is less than a predetermined reference current, and controls to turn off the switch element when the current value is equal to or greater than the reference current. do.
  • the inrush current exceeding a predetermined value is controlled so as not to flow, and a current exceeding a predetermined value is applied to the load devices. It can be controlled so that it does not flow.
  • FIG. 1 is a circuit diagram showing a configuration example of an inrush current prevention circuit according to an embodiment
  • FIG. 1 is a circuit diagram showing a configuration example of an inrush current prevention circuit according to an embodiment.
  • the inrush current prevention circuit according to the embodiment is configured by including an inrush current prevention main circuit 2 and an inrush current control circuit 3 .
  • the inrush current prevention main circuit 2 is a main circuit that allows an alternating current from, for example, a breaker output end of the AC power supply 1 to flow to the load device 4, (1) A series circuit 6 of a protection circuit 5 and a rush prevention resistor Rp (for example, 10 ⁇ ); (2) an electromagnetic relay RE1 connected to both ends of the series circuit 6 and turned on and off based on a control signal from the inrush current control circuit 3; (3) A voltage supply circuit 7 including a bipolar transistor Q1 that rectifies an alternating current by a rectifier circuit 21, converts it into a voltage value, and supplies the voltage to an electromagnetic relay RE1.
  • connection lines 9a and 9b The AC power supply 1 and the load device 4 are connected via a pair of connection lines 9a and 9b, the series circuit 6 is inserted in the connection line 9a, and the current detection resistor Rd described later is inserted in the connection line 9b. be.
  • the inrush prevention resistor Rp is provided to reduce and flow the current when the load device 4 is started.
  • the current from the AC power supply 1 flows to the load device 4 through the series circuit 6 of the protection circuit 5 and the inrush prevention resistor Rp provided on the connection line 9a, and returns from the load device 4.
  • the current returns to the AC power supply 1 via the connecting line 9b.
  • the protection circuit 5 is, for example, a thermal fuse or the like, and is disconnected when a predetermined current flows and reaches a predetermined temperature. This protection circuit 5 may be omitted depending on the circuit configuration.
  • One end of the series circuit 6 is connected to the movable contact c of the electromagnetic relay RE1, and the other end of the series circuit 6 is connected to the fixed contact a of the electromagnetic relay RE1.
  • a voltage from an AC power supply 1 is rectified by a rectifier circuit 21 having diodes D1 to D4 connected in a bridge form, and then the rectified voltage is applied to a smoothing capacitor C1, the collector and emitter of a bipolar transistor Q1, a capacitor C2 and a resistor R1. It is applied to the coil REc of the electromagnetic relay RE1 via the time constant circuit 8, the diode D11 and the smoothing capacitor C3.
  • the inrush current prevention main circuit 2 configured as described above, the current from the AC power supply 1 at the time of starting the load device 4 is suppressed by the inrush prevention resistor Rp, and then flows under the control of the inrush current control circuit 3 to be described later.
  • the bipolar transistor Q1 is turned on after a certain delay time by the time constant circuit 8, a predetermined voltage is applied to the coil REc of the electromagnetic relay RE1, and the electromagnetic relay RE1 is turned on. and the main current flows through the electromagnetic relay RE1 without passing through the rush prevention resistor Rp.
  • the inrush current control circuit 3 is (1) a current detection resistor Rd inserted in the connection line 9b; (2) a voltage detection circuit 31 including voltage dividing resistors R11, R12 and voltage dividing resistors R13, R14; (3) a source-grounded MOS field effect transistor (hereinafter referred to as a MOS transistor) Q2 having a drain connected to the base of the bipolar transistor Q1 and controlling on/off of the bipolar transistor Q1; (4) R10 that supplies a bias voltage for the MOS transistor Q2 based on the voltage of the capacitor C1; (5) a differential amplifier circuit 32 for detecting a differential voltage corresponding to the current flowing through the current detection resistor Rd; (6) the output voltage from the differential amplifier circuit 32, which is output based on the reference voltage at one end (AC power supply 1 side) of the current detection resistor Rd and the voltage at the other end (ground side) of the current detection resistor Rd; A differential amplifier circuit 33 that detects the difference voltage of (7) By comparing the output voltage from the differential
  • CM1 that outputs a high-level output voltage signal at a certain time and outputs a low-level output voltage signal when the current is less than the reference current;
  • a resistor R41 for applying the output voltage signal from the comparator CM1 to the gate of the MOS transistor Q2.
  • the differential amplifier circuit 32 includes an operational amplifier OP1, input resistors R21 and R22, a feedback resistor R23, and backflow prevention diodes D11 and D12.
  • the differential amplifier circuit 33 includes an operational amplifier OP2, an input resistor R32, and a bias resistor R31.
  • the reference voltage at one end of the current detection resistor Rd which is based on the ground potential of the capacitor C1 is detected by the voltage dividing resistors R11 and R12 and input to the non-inverting input terminal of the operational amplifier OP1 via the input resistor R22.
  • the voltage at the other end of the current detection resistor Rd which is based on the ground potential of the capacitor C1 is detected by the voltage dividing resistors R13 and R14 and input to the inverting input terminal of the operational amplifier OP1 via the input resistor R21.
  • the differential amplifier circuit 32 can detect a differential voltage corresponding to the current flowing through the current detection resistor Rd.
  • the output voltage from the differential amplifier circuit 32 is input to the inverting input terminal of the operational amplifier OP2 via the resistor R32. Also, the voltage of the non-inverting input terminal of the operational amplifier OP1 is input to the non-inverting input terminal of the operational amplifier OP2. As a result, the differential amplifier circuit 33 outputs a differential amplification voltage based on the reference voltage at one end of the current detection resistor Rd (AC power supply 1 side) and the voltage at the other end (ground side) of the current detection resistor Rd. A voltage difference from the output voltage from the circuit 32 is detected.
  • the comparator CM1 compares the output voltage from the differential amplifier circuit 33 with the reference voltage Vref, so that when the current flowing through the current detection resistor Rd is equal to or higher than the reference current Iref corresponding to the reference voltage Vref, the comparator CM1 outputs a high-level signal. It outputs an output voltage signal, and outputs a low-level output voltage signal when the current is less than the reference current Iref.
  • the output voltage signal is applied to the gate of MOS transistor Q2 via resistor R41.
  • the MOS transistor Q2 is on/off controlled based on the output voltage signal.
  • the MOS transistor Q2 when the current flowing through the current detection resistor Rd is equal to or higher than the reference current, the MOS transistor Q2 is turned on, and at this time the bipolar transistor Q1 is turned off to stop the voltage supply to the coil REc of the electromagnetic relay RE1. .
  • the MOS transistor Q2 when the current flowing through the current detection resistor Rd is less than the reference current, the MOS transistor Q2 is turned off, the bipolar transistor Q1 is turned on at this time, and voltage is supplied to the coil REc of the electromagnetic relay RE1.
  • each grounding of the load device 4 and the other end of the current detection resistor Rd is different from the grounding of the internal circuit of the inrush current prevention main circuit 2 and the inrush current control circuit 3 .
  • the electromagnetic relay RE1 Since the electromagnetic relay RE1 is turned off when the load device 4 is started, a predetermined current flows through the rush prevention resistor Rp. After that, a predetermined voltage is applied from the voltage supply circuit 7 to the coil REc of the electromagnetic relay RE1. Then, the current detection resistor Rd detects a voltage corresponding to the flowing current by the voltage detection circuit 31 of the rush current control circuit 3 and the differential amplifier circuits 32 and 33. At this time, the output voltage signal of the comparator CM1 is The MOS transistor Q2 is turned on by turning on the high level, thereby turning off the bipolar transistor Q1 and stopping the voltage supply from the voltage supply circuit 7 to the coil REc of the electromagnetic relay RE1.
  • a protection circuit 5 such as a thermal fuse is connected in series with the inrush prevention resistor Rp, so that a large current can be prevented from flowing through the load device 4 .
  • the user can select the breaker on the output side of the AC power supply 1 only by considering the current that always flows without worrying about the rush current.
  • a momentary voltage drop is less likely to occur in the load devices 4 of other facilities, so that the influence of the input voltage on the surrounding circuits can be reduced.
  • damage occurs in the load device 4 as described above, the current flowing through the load device 4 is suppressed so that the current exceeding the reference current Iref does not flow, and the components in the load device 4 are prevented from burning. can be prevented.
  • the electromagnetic relay RE1 is turned off and current flows through the rush prevention resistor Rp. As a result, it is possible to suppress a current greater than or equal to the reference current Iref from flowing through the load device 4 on the output side, and prevent damage or fire due to overcurrent on the primary side.
  • a protection circuit 5 such as a thermal fuse in series with the rush prevention resistor Rp, it is possible to prevent the rush prevention resistor Rp from firing.
  • the electromagnetic relay RE1 is used in the above embodiment, the present invention is not limited to this, and a switch element such as a semiconductor switch element such as a MOS transistor may be used.
  • the present invention is not limited to this, and a power supply such as a DC power supply may be used.
  • a DC power supply circuits such as the rectifier circuit 21 are not required.
  • the rush prevention resistor Rp and the current detection resistor Rd are inserted in different connection lines 9a and 9b, but the present invention is not limited to this, and they are inserted in the same connection line 9a or 9b. good too.
  • the current detecting resistor Rd and the voltage detecting circuit 31 are used to detect the current flowing through the connection line 9b and the current flowing through the current detecting resistor Rd, but the present invention is not limited to this.
  • Other current detection means such as a current detector may be used.
  • the inrush current prevention circuit of the present invention even when a plurality of load devices are used, the inrush current exceeding a predetermined value does not flow, It is possible to control so that the current does not exceed the flow.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

Le circuit de prévention de courant d'appel selon la présente invention empêche la circulation d'un courant d'appel entre une alimentation électrique et un dispositif de charge par l'intermédiaire d'une ligne de connexion et comprend : une résistance de prévention d'appel insérée dans la ligne de connexion et réduisant et faisant circuler le courant pendant le démarrage du dispositif de charge ; un élément de commutation connecté en parallèle à la résistance de prévention d'appel ; un détecteur de courant inséré dans la ligne de connexion ; et un circuit de commande pour commander le démarrage/l'arrêt de l'élément de commutation sur la base de la valeur de courant détectée par le détecteur de courant. Lorsque la valeur de courant est inférieure à un courant de référence prédéterminé, le circuit de commande effectue une commande de telle sorte que l'élément de commutation est allumé. Lorsque la valeur de courant est supérieure ou égale au courant de référence, le circuit de commande effectue une commande de telle sorte que l'élément de commutation est éteint.
PCT/JP2021/008407 2021-02-05 2021-03-04 Circuit de prévention de courant d'appel et son procédé de commande WO2022168335A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021017626A JP2022120614A (ja) 2021-02-05 2021-02-05 突入電流防止回路とその制御方法
JP2021-017626 2021-02-05

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WO2022168335A1 true WO2022168335A1 (fr) 2022-08-11

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63168509U (fr) * 1987-04-23 1988-11-02
JP2011101512A (ja) * 2009-11-06 2011-05-19 Toko Inc Ｕｓｂ接続機器に用いる入力保護回路

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63168509U (fr) * 1987-04-23 1988-11-02
JP2011101512A (ja) * 2009-11-06 2011-05-19 Toko Inc Ｕｓｂ接続機器に用いる入力保護回路

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