WO2007020692A1 - Circuit de réduction de courant d'appel et alimentation - Google Patents

Circuit de réduction de courant d'appel et alimentation Download PDF

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Publication number
WO2007020692A1
WO2007020692A1 PCT/JP2005/015048 JP2005015048W WO2007020692A1 WO 2007020692 A1 WO2007020692 A1 WO 2007020692A1 JP 2005015048 W JP2005015048 W JP 2005015048W WO 2007020692 A1 WO2007020692 A1 WO 2007020692A1
Authority
WO
WIPO (PCT)
Prior art keywords
current
circuit
capacitor
switching element
load
Prior art date
Application number
PCT/JP2005/015048
Other languages
English (en)
Japanese (ja)
Inventor
Masashi Takamatsu
Original Assignee
Fujitsu Limited
Fujitsu Peripherals Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Limited, Fujitsu Peripherals Limited filed Critical Fujitsu Limited
Priority to PCT/JP2005/015048 priority Critical patent/WO2007020692A1/fr
Priority to JP2007530876A priority patent/JP4662992B2/ja
Publication of WO2007020692A1 publication Critical patent/WO2007020692A1/fr

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/16—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for capacitors
    • 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
    • H02H9/001—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters

Definitions

  • the present invention relates to an inrush current reduction circuit that reduces an inrush current to a capacitor connected to a power input terminal of a load circuit, and a power supply apparatus that reduces the inrush current.
  • a display device connected to a personal computer exchanges various signals with the personal computer and obtains power from the personal computer. Since the current that a personal computer can supply to the display device is limited, the maximum value is determined as the specification.
  • Patent Document 1 Previously, in order to reduce the inrush current flowing into the load circuit, it was proposed to use multiple timers and switching elements and connect the divided capacitors to the power supply line with a time difference Being! (Patent Document 1).
  • Patent Document 1 JP 2000-175438
  • the capacitor is divided, whereby the inrush current is dispersed, and the purpose can be achieved.
  • the load circuit when the load circuit is activated, all the switching elements are turned on in a short time, and all the Since the capacitor is connected to the power supply circuit, all capacitors are fully loaded and operating. Therefore, the specifications must be selected on the premise of full operation for all capacitors, which is disadvantageous in terms of cost reduction. If the capacitor specifications are lowered to reduce costs, the lifetime of the capacitor becomes a problem.
  • the present invention has been made in view of the above-described problems, and can reduce inrush current to a capacitor in a load circuit or a power supply device, and can reduce the cost without shortening the life of the capacitor.
  • An object is to provide an inrush current reduction circuit and a power supply device.
  • An inrush current reducing circuit is an inrush current reducing circuit that reduces an inrush current to a capacitor connected to a power input terminal of a load circuit, and detects a current flowing through the load circuit.
  • a load current detection circuit, a switching element that is turned on when a current force S threshold value detected by the load current detection circuit exceeds a threshold value or a current change exceeds a threshold value, and the switching element And a second capacitor connected in parallel with the capacitor when turned on.
  • the switching element is controlled such that the current detected by the load current detection circuit does not exceed a value, or when the current changes or a change in the current does not exceed the value, and is sometimes turned off.
  • the switching element is turned off, the resistance connected in parallel with the second capacitor is substantially infinite, and the charging charge of the second capacitor is maintained.
  • the load current detection circuit detects a current including a current flowing through an audio output circuit included in the load circuit, and the current threshold is increased by an increase in an audio level in the audio output circuit.
  • the switching element is configured to be turned on when the value is exceeded.
  • the load current detection circuit detects a current including a current flowing through an inverter circuit having a variable duty ratio included in the load circuit, and the duty ratio in the inverter circuit is 50%.
  • the switching element is configured to turn on when the current change exceeds a threshold value due to the approach.
  • a plurality of switching elements that operate respectively with a plurality of different threshold values are provided, and each switching element is connected in parallel with the capacitor when turned on. A second capacitor is provided.
  • Another embodiment of the inrush current reducing circuit according to the present invention is an inrush current reducing circuit for reducing an inrush current to a capacitor connected to a power supply input terminal of a load circuit, the current flowing through the load circuit.
  • a load current detection resistor that detects a load
  • a comparison circuit that outputs an ON signal when the voltage across the load current detection resistor exceeds a set value, and an ON signal that is output from the comparison circuit
  • a switching element and a second capacitor connected in parallel with the capacitor when the switching element is turned on.
  • a power supply device is a power supply device that supplies a direct current to a load circuit, and detects a current flowing in the load circuit and a capacitor for stabilizing the current supplied to the load circuit.
  • a load current detection circuit that turns on when the current detected by the load current detection circuit exceeds a threshold value or when a change in current exceeds the threshold value, and the switching element turns on And a second capacitor connected in parallel with the capacitor.
  • the switching element is controlled so that the current detected by the load current detection circuit does not exceed a value, or when the current changes, or does not exceed the value, and is sometimes turned off.
  • the switching element is turned off, the resistance connected in parallel to the second capacitor is substantially infinite, and the charging charge of the second capacitor is maintained.
  • FIG. 1 is a schematic circuit diagram of an electronic device provided with an inrush current reducing circuit according to the present invention.
  • FIG. 2 is a diagram showing an example of the operation of an inrush current reducing circuit.
  • FIG. 3 is a diagram showing another example of the operation of the inrush current reduction circuit.
  • FIG. 4 is a circuit diagram of an electronic device provided with an inrush current reducing circuit according to another example of the present invention.
  • FIG. 5 is a circuit diagram of a power supply device provided with an inrush current reducing circuit of another example according to the present invention.
  • FIG. 6 is a circuit diagram showing still another example of an inrush current reducing circuit.
  • FIG. 1 is a schematic circuit diagram of an electronic device DK provided with an inrush current reduction circuit 5 according to the present invention
  • FIG. 2 is a diagram showing an example of the operation of the inrush current reduction circuit 5
  • the circuit of the electronic device DK is provided with a protection circuit 11, a detection circuit 12, a load circuit 13, a switching element Ql, and two capacitors CI and C2.
  • the protection circuit 11 is for protecting the circuit when the power supply line L1 of the electronic device DK (including the load circuit 13) is abnormal, or protecting the power supply device that supplies power to the electronic device DK. belongs to.
  • the protection circuit 11 detects the current i flowing through the power supply line L1 and cuts off the connection between the power input terminal TM1 and the power supply line L1 when the current i exceeds a specified value.
  • the voltage e of the power line L1 is detected, and when the voltage e is out of the set range, the circuit is cut off in the same way.
  • the detection circuit 12 detects a current id flowing through the load circuit 13 or a change A id of the current id flowing through the load circuit 13. That is, the detection signal S1 is output when the current id exceeds the threshold value Thl or when the change Aid exceeds the threshold value Th8.
  • the load circuit 13 is an electronic circuit for realizing an original function of the electronic device DK.
  • the electronic device DK is a display device, a lighting circuit, a control circuit, a synchronization circuit, a dimming circuit, a video circuit, a knock light, etc. for displaying on an LCD, PDP, or CRT
  • It is included in the power load circuit 13 such as a circuit, a sound output circuit for outputting sound from a speaker, a sound effect circuit, a sound quality adjustment circuit, etc., a remote operation circuit, and other various circuits.
  • Switching element Q1 outputs detection signal S1 when detection signal S1 is turned on. Turns on when In other words, the switching element Q1 has a current id detected by the detection circuit 12 that does not exceed the threshold value! /, The value Thl! /, Or the current change ⁇ id does not exceed the threshold value! /, The value Th8. Controlled to turn off.
  • capacitor C2 is connected to power supply line L1.
  • the switching element Q1 for example, a MOS type FET, a bipolar transistor, a thyristor, an IC formed of them, or a relay is used.
  • the capacitor C1 is always connected to the power supply line L1. That is, it is indirectly connected to the power input terminal TM1 through the protection circuit 11. As described above, the capacitor C2 is connected to the power supply line L1 via the switching element Q1. When the switching element Q1 is turned on, the capacitor C2 is actually connected to the power supply line L1 and is in an operating state. . In other words, when the switching element Q1 is turned off, the resistance connected in parallel to the capacitor C2 is practically infinite, and in this state, the charge of the capacitor C2 is maintained almost as it is.
  • capacitors CI and C2 are intended to stabilize the power supply by suppressing the fluctuation of the voltage in the power supply line L1, and usually a large-capacity aluminum electrolytic capacitor or the like is used. .
  • Capacitors CI and C2 have the same capacitance, for example, 500 F each. In other words, in this case, the capacitor C for stabilizing the power supply is divided into two capacitors CI and C2 having a capacity of 1000 F.
  • capacitor C2 Since the capacitor C2 operates only when necessary as described later, the actual operation time is shorter than that of the capacitor C1. Therefore, the specification of the capacitor C2 can be selected lower than that of the capacitor C1. For example, if capacitor C1 can be used in an environment of 105 ° C and has a 1000 hour specification, capacitor C2 can be used in an environment of 85 ° C and has a 1000 hour specification.
  • the detection circuit 12 the switching element Ql, and the capacitor C2 constitute an inrush current reduction circuit 5.
  • Electronic device DK power input terminal TM1 suitable device such as a personal computer Connect to the power supply terminal.
  • the power switch is turned on to operate the electronic device DK.
  • a power switch may be provided in the protection circuit 11 so as to connect or block between the power input terminal TM1 and the power line L1.
  • a power switch may be provided separately from the protection circuit 11 and the load circuit 13 to control the function and operation of the electronic device DK.
  • the inrush current itl flows through the capacitor C1 at the time tl when the power input terminal TM1 is connected to the power terminal or the power switch is turned on. Since the magnitude of the inrush current itl depends on the capacitance of the capacitor C1, by setting the capacitor C1 to 500 F, it is about half that of 1000 F. Thereafter, since the load circuit 13 operates normally, an idling current (load current id) flows due to the operation of the load circuit 13.
  • load current id load current
  • the sound output circuit outputs a loud sound such as an explosion sound, so that the current id increases, and the increased current id is detected by the detection circuit 12.
  • the detection signal SI is output.
  • the switching element Q1 When the detection signal S1 is output, the switching element Q1 is turned on, and the capacitor C2 is connected to the power supply line L1. At that time t2, the inrush current it2 flows through the capacitor C2. Since the magnitude of the inrush current it2 depends on the capacitance of the capacitor C2, when the capacitor C2 is set to 500 / z F, it starts from the same force as the inrush current itl of the capacitor C1 or a certain amount of charge. Less than.
  • the detection signal S1 While the current id of the load circuit 13 exceeds the threshold value Thl, the detection signal S1 is output. Therefore, during this period, the switching element Q1 is turned on and the capacitor C2 is activated. . When the current id becomes smaller than the threshold value Thl, the detection signal S1 is turned off, so that the switching element Q1 is turned off and the connection of the capacitor C2 is released.
  • the detection circuit 12 detects the current id including the current flowing through the audio output circuit. Then, the switching element Q1 is turned on when the current id exceeds the threshold value Thl due to the increase in the sound level in the sound output circuit. In this way, the capacitor C2 is connected and activated only when the load circuit 13 operates above a certain level, and the capacitor C2 is not operating when it is not needed. C2 life is extended. Therefore, the mounting cost of the capacitor C2 can be reduced.
  • the knock light lighting circuit is turned on by applying a square-wave voltage with a variable duty ratio to the arc tube, and its luminance is adjusted.
  • an inverter circuit that outputs a square wave voltage with a variable duty ratio is provided.
  • the duty ratio is 100%, a continuous current flows and the maximum brightness is obtained. In this case, since the current does not fluctuate, it is not necessary to stabilize the power supply. Therefore, the capacitor C 1 alone is sufficient.
  • an inrush current it 1 flows through the capacitor C1 at the time tl when the power is turned on.
  • the current id is large (for example, about 2A), but the change Aid is zero. Since the duty ratio has been adjusted to 50 percent at time t3, it is between the threshold value Th8H and threshold value Th8L, and the change A id has exceeded the threshold value Th8. Therefore, the detection signal S1 is output, the switching element Q1 is turned on, and the capacitor C2 is connected to the power supply line L1.
  • the detection circuit 12 detects the change A id of the current id, and the switching element Q 1 is controlled to be turned on when the change A id exceeds the threshold V and the value Th8.
  • capacitor C2 becomes active only when inrush current it to capacitor C decreases and current id changes Aid increases, so capacitor C2 Can reduce the cost of the capacitor C2.
  • FIG. 4 is a schematic circuit diagram of an electronic device DK provided with an inrush current reducing circuit 5B according to another example of the present invention.
  • parts having the same functions as those in FIG. 4 are shown in FIG. 4, and in FIG. 4, parts having the same functions as those in FIG.
  • the switching element Q 1 is turned on / off in response to the detection signal S 1, and the capacitor C 2 is connected to or released from the power supply line L 1.
  • the inrush current reduction circuit 5B shown in FIG. 4 it is possible to detect the current id with a simple configuration and determine whether or not the magnitude exceeds the threshold value Thl.
  • FIG. 5 is a circuit diagram of the power supply device 1 provided with the inrush current reducing circuit 5C of another example according to the present invention.
  • the power supply device 1 includes a protection circuit 21, an ACZDC converter 22, and an inrush current reduction circuit 5C.
  • the protection circuit 21 is for protecting the circuit when an abnormality occurs in the power supply device 1.
  • the protection circuit 21 is an overcurrent circuit breaker, a fuse, or the like. May include a power switch.
  • the ACZDC converter 22 converts the input AC voltage such as AC 100 volts or AC 200 volts into a predetermined DC voltage (for example, 5 volts, 9 volts, 12 volts, etc.).
  • a predetermined DC voltage for example, 5 volts, 9 volts, 12 volts, etc.
  • various known ones such as one using a power transformer and a rectifier or one using an inverter circuit can be adopted.
  • Capacitors CI and C2 are for stabilizing the power supply, and also serve as smoothing capacitors for reducing ripple.
  • an appropriate electronic device serving as a load is connected to the DC output terminal and an AC voltage is supplied to the power supply device 1, an inrush current first flows through the capacitor C1.
  • the detection circuit 23 does not output the detection signal S1, and therefore the switching element Q1 is off and the capacitor C2 is not connected to the power supply line L1.
  • the detection circuit 23 outputs the detection signal S1, the switching element Q1 is turned on, and the capacitor C2 is connected to the power supply line L1. At this time, an inrush current flows through the capacitor C2.
  • the capacitor C is divided into two capacitors CI and C2, and the second capacitor C2 is connected only when the current id increases, so that the inrush current to the capacitor Are dispersed and the peak value is halved. The actual operating time of the capacitor C2 is also reduced.
  • FIG. 6 is a circuit diagram showing still another example of the inrush current reducing circuit 5D.
  • the capacitor C is divided into three capacitors CI, C2, and C3 each having a capacity of one third.
  • One capacitor C1 is always connected to the power line L1.
  • the second capacitor C2 is connected when the current id exceeds the threshold value Thl
  • the third capacitor C3 is connected when the current id exceeds the threshold value Th2 (Th2> Thl).
  • the inrush current to the capacitor C is distributed in three parts, which can further reduce the peak value of the inrush current.
  • Capacitor C may be further divided so that the inrush current is distributed four times, five times, six times, or seven times or more.
  • the protection circuit 11, the detection circuit 12, the load circuit 13, the inrush current reduction circuit 5, 5B, 5C, 5D, and the circuit configuration or circuit constants of the whole or each part of the power supply device 1, the types of capacitors and switching elements can be appropriately changed in accordance with the spirit of the present invention.
  • the present invention is used to reduce inrush current due to a capacitor in a display device or the like that is supplied with power from a computer main body, and can also be used as a power supply device.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Dc-Dc Converters (AREA)
  • Control Of Voltage And Current In General (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Rectifiers (AREA)

Abstract

Afin de réduire le courant d'appel sur un condensateur dans un circuit de charge ou dans une alimentation et de réduire le coût sans réduire la durée de vie du condensateur, un circuit destiné à réduire le courant d'appel sur un condensateur qui est relié à une borne d'entrée d'alimentation d'un circuit de charge comprend un circuit de détection de courant de charge (12) destiné à détecter un courant (id) circulant dans un circuit de charge (13), un élément de commutation (Q1) qui est fermé lorsque le courant (id) détecté par le circuit de détection de courant de charge (12) dépasse un seuil ou que la variation du courant dépasse un seuil, ainsi qu'un second condensateur (C2) qui est relié en parallèle au condensateur (C1) lorsque l'élément de commutation (Q1) est fermé.
PCT/JP2005/015048 2005-08-18 2005-08-18 Circuit de réduction de courant d'appel et alimentation WO2007020692A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP2005/015048 WO2007020692A1 (fr) 2005-08-18 2005-08-18 Circuit de réduction de courant d'appel et alimentation
JP2007530876A JP4662992B2 (ja) 2005-08-18 2005-08-18 突入電流軽減回路および電源装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2005/015048 WO2007020692A1 (fr) 2005-08-18 2005-08-18 Circuit de réduction de courant d'appel et alimentation

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WO2007020692A1 true WO2007020692A1 (fr) 2007-02-22

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014106894A1 (fr) * 2013-01-07 2014-07-10 三菱電機株式会社 Dispositif de conversion de puissance électrique et dispositif de climatisation d'air l'utilisant
JP2014131446A (ja) * 2012-12-28 2014-07-10 Daikin Ind Ltd 電力変換装置
US9614456B2 (en) 2012-11-20 2017-04-04 Mitsubishi Electric Corporation Power conversion apparatus that prevents inrush current and air-conditioning apparatus using the same
EP2835886B1 (fr) * 2013-03-28 2021-06-02 Vertiv Corporation Module d'alimentation électrique et procédé de démarrage souple

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1195845A (ja) * 1997-09-19 1999-04-09 Fujitsu Ltd 電源投入制御回路
JP2000175438A (ja) * 1998-12-07 2000-06-23 Nec Yonezawa Ltd 突入電流軽減回路
JP3188873B2 (ja) * 1998-10-13 2001-07-16 フェニックス電機株式会社 放電ランプの点灯装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1195845A (ja) * 1997-09-19 1999-04-09 Fujitsu Ltd 電源投入制御回路
JP3188873B2 (ja) * 1998-10-13 2001-07-16 フェニックス電機株式会社 放電ランプの点灯装置
JP2000175438A (ja) * 1998-12-07 2000-06-23 Nec Yonezawa Ltd 突入電流軽減回路

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9614456B2 (en) 2012-11-20 2017-04-04 Mitsubishi Electric Corporation Power conversion apparatus that prevents inrush current and air-conditioning apparatus using the same
JP2014131446A (ja) * 2012-12-28 2014-07-10 Daikin Ind Ltd 電力変換装置
WO2014106894A1 (fr) * 2013-01-07 2014-07-10 三菱電機株式会社 Dispositif de conversion de puissance électrique et dispositif de climatisation d'air l'utilisant
JP5933038B2 (ja) * 2013-01-07 2016-06-08 三菱電機株式会社 電力変換装置及びこれを用いた空気調和装置
EP2942862A4 (fr) * 2013-01-07 2016-08-24 Mitsubishi Electric Corp Dispositif de conversion de puissance électrique et dispositif de climatisation d'air l'utilisant
EP2835886B1 (fr) * 2013-03-28 2021-06-02 Vertiv Corporation Module d'alimentation électrique et procédé de démarrage souple

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JP4662992B2 (ja) 2011-03-30
JPWO2007020692A1 (ja) 2009-02-19

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