WO2002075909A1 - Alimentation de courant multiple et procede et dispositif de protection contre les surtensions d'une alimentation de courant multiple - Google Patents

Alimentation de courant multiple et procede et dispositif de protection contre les surtensions d'une alimentation de courant multiple Download PDF

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Publication number
WO2002075909A1
WO2002075909A1 PCT/JP2001/002201 JP0102201W WO02075909A1 WO 2002075909 A1 WO2002075909 A1 WO 2002075909A1 JP 0102201 W JP0102201 W JP 0102201W WO 02075909 A1 WO02075909 A1 WO 02075909A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
voltage
output
power supply
secondary side
Prior art date
Application number
PCT/JP2001/002201
Other languages
English (en)
Japanese (ja)
Inventor
Hiroya Tanaka
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/JP2001/002201 priority Critical patent/WO2002075909A1/fr
Publication of WO2002075909A1 publication Critical patent/WO2002075909A1/fr

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Classifications

    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection

Definitions

  • the present invention relates to a method and a device for controlling overcurrent protection of a multi power supply device and a multi power supply device. In particular, it is used for overcurrent protection of switching type multi power supply devices.
  • a personal computer and its peripheral devices are equipped with a multi-power supply device for supplying a necessary DC voltage to each part of the device.
  • a multi-power supply device is generally configured so that a switching circuit controls an input current flowing to a primary side of a transformer and extracts output from a plurality of output circuits provided on a secondary side of the transformer.
  • the multi-power supply mounted on the device has three output circuits of 9 volts, 15 volts and 24 volts to supply the control circuits, and 80 volts and 1 volts for driving the brown tube. It has two output circuits of 60 volts.
  • an overcurrent protection device for stopping the operation when the output circuit is short-circuited or when the current of the output circuit becomes excessive has been conventionally provided.
  • the input current on the primary side is not always increased to the input upper limit. For example, if the output circuit of 80 volts is short-circuited, the power consumed there will be large, and the input current on the primary side will increase significantly and the protection device will operate. However, if the 9 volt output circuit is short-circuited, the power consumed there will be small and the primary side input current will not be as high. It may not increase and the protection device may not operate.
  • An object of the present invention is to protect an apparatus by detecting an overcurrent of each of a plurality of output circuits with a simple circuit.
  • a multi-power-supply device configured to control an input current flowing to a primary side of a transformer by a switching circuit and extract output from a plurality of output circuits provided on a secondary side of the transformer
  • a protection circuit for stopping the switching circuit when an input current exceeds an input upper limit, and a voltage for detecting a voltage of at least one output circuit provided on the secondary side.
  • a detection circuit a differentiating circuit connected to the voltage detection circuit for detecting a change in voltage of another output circuit provided on the secondary side, and a voltage detected by the voltage detection circuit.
  • a control circuit for operating the protection circuit when the voltage falls below a threshold value.
  • the switching circuit includes a switching element, and a drive circuit that supplies a pulse signal to the switching element to drive the switching element, wherein the drive circuit has a control input terminal for controlling an ON time of the pulse signal.
  • the control circuit has a control signal that maximizes the ON time of the pulse signal when the voltage detected by the voltage detection circuit drops below a threshold. It is composed of a gate circuit that outputs to BRIEF DESCRIPTION OF THE FIGURES
  • FIG. 1 is a circuit diagram of a power supply device 1 showing an embodiment according to the present invention
  • FIG. 2 is a power supply device.
  • FIG. 3 is a diagram illustrating a state of a signal of each unit of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
  • a power supply 1 includes a transformer T1, an input circuit 11, a switching circuit 12, five output circuits 21 to 25, and a protection circuit 31.
  • the input circuit 11 includes, for example, a rectifier RC for rectifying 100-volt AC power, a smoothing capacitor C11, and the like.
  • the switching circuit 12 includes power such as the drive circuit 12 1 and the switching element Q 1.
  • a transistor or FET is used as the switching element Q1.
  • the drive circuit 1221 drives the switching element Q1 by supplying a pulse signal SD.
  • the pulse signal SD is on, the switching element Q1 conducts.
  • the drive circuit 122 has a control input terminal FB.
  • the potential VFB of the control input terminal FB is varied according to the resistance value connected between the control input terminal FB and the ground, thereby controlling the on-time (duty ratio) of the pulse signal SD.
  • the potential VFB of the control input terminal FB becomes the maximum value.
  • the potential VFB at that time is, for example, 5 volts.
  • the ON time of the pulse signal SD becomes the maximum, and the maximum power is supplied to the primary side of the transformer T1.
  • the control input terminal FB is grounded, the potential VFB becomes zero, the on-time of the pulse signal SD becomes minimum, and the power supplied to the primary side of the transformer T1 becomes minimum.
  • the drive circuit 122 has a stop terminal HC.
  • the stop signal SP is input to the stop terminal HC, the drive circuit 122 stops its operation.
  • the pulse signal SD is not output, and therefore, the switching element Q1 does not turn on.
  • Such a drive circuit 122 can be configured using a comparator that compares the voltage of the control input terminal FB with a triangular wave.
  • Drive circuit 1 2 1 It is commercially available as an integrated circuit device (for example, nominal type: UC3842) and is known.
  • Each of the output circuits 21 to 25 has a rectifying diode, a smoothing capacitor, and the like, and outputs a DC output OUT 1 to 5.
  • the output voltages of the output circuits 21 to 25 are, for example, 9 volts, 15 volts, 24 volts, 160 volts, and 80 volts.
  • Each of the output circuits 21 to 23 is provided with a constant voltage circuit 314 and a differentiation circuit 315 described later.
  • the output circuit 24 is provided with a voltage detection circuit 313 described later.
  • the output circuit 25 is provided with a gate circuit 312 described later.
  • the protection circuit 31 is composed of OCP (Over Current Protector) 311, current detection resistor R16, gate circuit 312, voltage detection circuit 313, constant voltage circuit 314, and differentiation.
  • the circuit consists of 3 15. '
  • the input current I flowing through the input circuit 11 is detected by the resistor R16.
  • the OCP 311 outputs the stop signal SP when the voltage SC generated across the resistor R16 exceeds the input upper limit value th1.
  • the drive circuit 122 stops due to the stop signal SP, and the switching circuit 122 stops.
  • the input upper limit value t h1 at which 0 C P 311 operates is set, for example, to correspond to about 1.3 to 1.6 times the steady-state current. This protects the power supply 1 from overcurrent.
  • the configuration and action of such OCP311 are known.
  • the gate circuit 3 1 2 is composed of a photo cover PC 1 and a Shuntregi-Yuraya SR.
  • the gate circuit 312 is connected to the output circuit 25 via a resistor R15, a constant voltage diode D4, a constant voltage circuit, and the like.
  • the rated voltage of the constant voltage diode D4 is, for example, 15 volts.
  • a constant DC voltage is supplied to the gate circuit 312 by the constant voltage circuit.
  • the shunt-reguler SR is a circuit element that conducts from the cathode to the node when the voltage (gate voltage) VG2 applied to the gate G2 exceeds the threshold th2.
  • the shunt regulée SR is configured using a comparator that compares a voltage equal to the threshold value th2 with a voltage input to the gate G2.
  • the photo force bra PC 1 is off. Therefore, the potential VFB of the control input terminal FB of the drive circuit 1 2 1 is the maximum value.
  • the on / off signal output from the photocoupler PC1 to the control input terminal FB corresponds to the control signal of the present invention.
  • the voltage detection circuit 313 includes a resistor R10 and a resistor R11.
  • the voltage detection circuit 3 13 detects the voltage of the output circuit 2 based on the voltage division ratio of the resistor R 10 and the resistor R 11.
  • the voltage detection circuit 3 1 The partial pressure ratio by 3 is 64 times smaller. Therefore, for example, the resistance R 10 may be set to 24.6 kOhm, and the resistance R 11 may be set to 3.9 kOhm.
  • the resistance R12 is of the order of 200 ohms.
  • the output voltage of the output circuit 24 is normally maintained at 160 volts, and the other output circuits are also at predetermined levels. Voltage is maintained.
  • the constant voltage circuit 314 includes resistors R1 to R3 and constant voltage diodes D1 to D3.
  • the rated voltages of the constant voltage diodes Dl, D2, and D3 are, for example, 7 volts, 12 volts, and 20 volts. These are connected to the output circuits 21 to 23, respectively, and remove the pulsating flow of each line to obtain a complete DC voltage.
  • the differentiating circuit 315 includes capacitors C1 to C3 and resistors R4 to R6. These are connected between the constant voltage circuit 31 and the midpoint of the voltage detection circuit 313. As a result, a change in each voltage when each of the output circuits 21 to 23 is short-circuited is detected as a voltage across the resistor R11.
  • capacitors C1 to C3 each have a 2-micron farad
  • resistors R4 to R6 each have a resistance of about 100 k ⁇
  • resistors R1 to R3 each have a resistance of about 1 k ⁇ . It is.
  • the gate voltage VG2 decreases, and 0CP311 operates through the same process as above.
  • the photo power PC 1 is turned off, and the OCP 311 operates through the same process as above.
  • the output circuits 21 to 25 are short-circuited, the input current I increases by itself, so that the OCP 311 directly performs the overcurrent protection operation without going through the operation of the gate circuit 312. There are cases.
  • the drive circuit 121, 0 CP 311 and the gate circuit 312 can have various circuit configurations or element configurations other than those described above.
  • the configurations and element constants of the voltage detection circuit 3 13, the constant voltage circuit 3 14, and the differentiation circuit 3 15 can be various other than those described above.
  • an adding circuit having a diode or a transistor can be used as a method of connecting the differentiating circuit 315 to the voltage detecting circuit 313, an adding circuit having a diode or a transistor can be used.
  • the present invention can protect the power supply device by detecting the overcurrent of each of the plurality of output circuits with a simple circuit. It is especially suitable when the voltages of the output circuits differ greatly.
  • the invention is useful in the electronics industry.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

L'invention concerne un dispositif d'alimentation de courant multiple comportant un circuit de commutation (12) commandant le courant d'entrée (I) appliqué à la partie primaire d'un transformateur, et une pluralité de circuits de sortie (21-25) disposée dans la partie secondaire du transformateur, produisant la sortie. Le dispositif d'alimentation de courant multiple selon l'invention comporte également un circuit de protection (311) destiné à arrêter un circuit de commutation (12) lorsqu'un courant d'entrée (I) dépasse un niveau d'entrée maximal, un circuit de détection de tension (313) destiné à détecter la tension d'au moins un circuit de sortie (24) disposé dans la partie secondaire, un circuit différentiateur relié au circuit de détection de tension (313) de manière à détecter la variation de la tension d'autres circuits de sortie (21-23) disposés dans la partie secondaire (315), et un circuit de commande (312) destiné à piloter le circuit de protection (311) lorsque la tension détectée par le circuit de détection de tension (313) est inférieure à un seuil.
PCT/JP2001/002201 2001-03-19 2001-03-19 Alimentation de courant multiple et procede et dispositif de protection contre les surtensions d'une alimentation de courant multiple WO2002075909A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2001/002201 WO2002075909A1 (fr) 2001-03-19 2001-03-19 Alimentation de courant multiple et procede et dispositif de protection contre les surtensions d'une alimentation de courant multiple

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2001/002201 WO2002075909A1 (fr) 2001-03-19 2001-03-19 Alimentation de courant multiple et procede et dispositif de protection contre les surtensions d'une alimentation de courant multiple

Publications (1)

Publication Number Publication Date
WO2002075909A1 true WO2002075909A1 (fr) 2002-09-26

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PCT/JP2001/002201 WO2002075909A1 (fr) 2001-03-19 2001-03-19 Alimentation de courant multiple et procede et dispositif de protection contre les surtensions d'une alimentation de courant multiple

Country Status (1)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008012121A1 (fr) * 2006-07-24 2008-01-31 Continental Automotive Gmbh Disposition de connexions
EP2544352A3 (fr) * 2011-07-08 2015-06-10 Vestel Elektronik Sanayi ve Ticaret A.S. Interruption momentanée de l'alimentation et protection de réinitialisation de chutes de tension
CN107104587A (zh) * 2017-06-20 2017-08-29 中国电子科技集团公司第四十三研究所 一种双路输出过流保护电路
CN115528901A (zh) * 2022-11-23 2022-12-27 浙江台邦星普智能科技有限公司 一种伺服驱动器多路输出电源装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH077870A (ja) * 1993-06-15 1995-01-10 Murata Mfg Co Ltd 電源回路装置
JPH08331843A (ja) * 1995-05-31 1996-12-13 Nemic Lambda Kk スイッチング電源装置の出力電圧検出回路
JPH09121537A (ja) * 1995-10-26 1997-05-06 Hitachi Ltd 電源短絡保護回路

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH077870A (ja) * 1993-06-15 1995-01-10 Murata Mfg Co Ltd 電源回路装置
JPH08331843A (ja) * 1995-05-31 1996-12-13 Nemic Lambda Kk スイッチング電源装置の出力電圧検出回路
JPH09121537A (ja) * 1995-10-26 1997-05-06 Hitachi Ltd 電源短絡保護回路

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008012121A1 (fr) * 2006-07-24 2008-01-31 Continental Automotive Gmbh Disposition de connexions
EP2544352A3 (fr) * 2011-07-08 2015-06-10 Vestel Elektronik Sanayi ve Ticaret A.S. Interruption momentanée de l'alimentation et protection de réinitialisation de chutes de tension
CN107104587A (zh) * 2017-06-20 2017-08-29 中国电子科技集团公司第四十三研究所 一种双路输出过流保护电路
CN107104587B (zh) * 2017-06-20 2023-10-27 中国电子科技集团公司第四十三研究所 一种双路输出过流保护电路
CN115528901A (zh) * 2022-11-23 2022-12-27 浙江台邦星普智能科技有限公司 一种伺服驱动器多路输出电源装置
CN115528901B (zh) * 2022-11-23 2023-03-24 浙江台邦星普智能科技有限公司 一种伺服驱动器多路输出电源装置

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