JPH07184316A - Open phase detecting circuit - Google Patents
Open phase detecting circuitInfo
- Publication number
- JPH07184316A JPH07184316A JP32676293A JP32676293A JPH07184316A JP H07184316 A JPH07184316 A JP H07184316A JP 32676293 A JP32676293 A JP 32676293A JP 32676293 A JP32676293 A JP 32676293A JP H07184316 A JPH07184316 A JP H07184316A
- Authority
- JP
- Japan
- Prior art keywords
- phase
- output
- section
- input current
- open
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Landscapes
- Control Of Voltage And Current In General (AREA)
- Power Conversion In General (AREA)
- Emergency Protection Circuit Devices (AREA)
- Rectifiers (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、三相交流電圧を入力す
る直流安定化電源における欠相検出回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open phase detection circuit in a stabilized direct current power supply for inputting a three-phase AC voltage.
【0002】[0002]
【従来の技術】特開平3−11925号公報には、交流
の整流前に入力の線間電圧の状態から装置に入力される
電源に停電が発生したか否かを検出する電源検出器5
と、この電源検出器5の出力から欠相状態を検出する判
定回路とを備えている。2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 3-11925 discloses a power supply detector 5 for detecting whether or not a power failure has occurred in a power supply input to a device based on a state of an input line voltage before AC rectification.
And a determination circuit for detecting the open phase state from the output of the power supply detector 5.
【0003】[0003]
【発明が解決しようとする課題】この技術では、入力の
欠相や停電などの異常を検知できるが電源を安定させる
ための技術が開示されていない。このため電源の安定化
のための信頼性を向上させることはできないという欠点
がある。This technique can detect abnormalities such as input phase loss and power failure, but does not disclose a technique for stabilizing the power supply. Therefore, there is a drawback that the reliability for stabilizing the power source cannot be improved.
【0004】[0004]
【課題を解決するための手段】本発明の回路は、三相交
流電源の交流を直流に変換する整流平滑部と、この整流
平滑部から供給される電圧を安定な電圧に変換するDC
−DCコンバータ部と、このDC−DCコンバータ部の
投入および切断を制御する電源投入切断制御部と、前記
三相交流電源の入力電流を監視する入力電流検出部と、
この入力電流検出部の出力電圧が基準電圧より高いとき
欠相と判断し入力電流が定格電流より低い場合は異常と
判断し検出信号を前記電源投入切断制御部へ供給する欠
相検出部とを含む。SUMMARY OF THE INVENTION The circuit of the present invention comprises a rectifying / smoothing section for converting an alternating current of a three-phase AC power supply into a direct current, and a DC for converting a voltage supplied from the rectifying / smoothing section into a stable voltage.
A DC converter section, a power supply on / off control section for controlling the turning on and off of the DC-DC converter section, and an input current detecting section for monitoring the input current of the three-phase AC power supply,
When the output voltage of the input current detection unit is higher than the reference voltage, it is judged as an open phase, and when the input current is lower than the rated current, it is judged as abnormal and the open phase detection unit for supplying a detection signal to the power-on / off control unit is provided. Including.
【0005】[0005]
【実施例】次に本発明の一実施例について図面を参照し
て詳細に説明する。An embodiment of the present invention will now be described in detail with reference to the drawings.
【0006】図1を参照すると、本発明の一実施例は、
同一コア上にR相、およびS相を同じ巻始め、同じ巻数
で巻きT相を逆向に同じ巻数巻きさらに電流検出用の巻
綿を巻いたカレントトランス25、このカレントトラン
ス25の出力を整流平滑するためダイオード6−11お
よび平滑用コンデンサ12で構成される整流平滑部1、
この整流平滑部1の出力を入力し安定化された直流電圧
を出力するDC−DCコンバータ部2、この整流平滑部
1の一出力とDC−DCコンバータ部2の対応する一入
力との間に配置されこのDC−DCコンバータ部2への
入力電流を検出する入力電流検出回路13、入力電流を
検出するため前記カレントトランス25の他電流を電圧
に変換する抵抗24、整流用コンデンサ23、および平
滑コンテンサ22を有する入力電流検出部21、この入
力電流検出部21の出力電圧と基準電圧とを比較する比
較器17および18、これら比較器の一方18の出力と
入力電流検出回路13の出力との論理積をとるアンド回
路16、およびこのアンド回路16の出力と他方の比較
器17の出力の論理和をとるオア回路15を有する欠相
検出部14、およびこの欠相検出部14の出力を入力し
DC−DCコンバータ部2の投入切断を制御する電源投
入切断制御部4を含む。Referring to FIG. 1, one embodiment of the present invention is
R-phase and S-phase are started on the same core, the same number of turns is applied, the T-phase is turned in the opposite direction, the same number of turns, and the current transformer 25 is wound with cotton for current detection. In order to do so, the rectifying / smoothing unit 1 including the diode 6-11 and the smoothing capacitor 12,
A DC-DC converter unit 2 which receives the output of the rectifying / smoothing unit 1 and outputs a stabilized DC voltage, and between one output of the rectifying / smoothing unit 1 and one corresponding input of the DC-DC converter unit 2. An input current detection circuit 13 arranged to detect an input current to the DC-DC converter unit 2, a resistor 24 for converting another current of the current transformer 25 to detect an input current into a voltage, a rectifying capacitor 23, and a smoothing. An input current detection unit 21 having a contenter 22, comparators 17 and 18 for comparing an output voltage of the input current detection unit 21 with a reference voltage, an output of one of the comparators 18 and an output of the input current detection circuit 13 are provided. An AND circuit 16 that takes a logical product, and an open-phase detector 14 that has an OR circuit 15 that takes a logical sum of the output of the AND circuit 16 and the output of the other comparator 17, and Inputs the output of the phase failure detector 14 includes a power-off control unit 4 for controlling the charged disconnection of the DC-DC converter unit 2.
【0007】次に本発明の一実施例の動作について図面
を参照して詳細に説明する。Next, the operation of one embodiment of the present invention will be described in detail with reference to the drawings.
【0008】図1および図2を参照すると、正常状態に
おいて、R、S、T相の入力電流は図2のようになり入
力電流検出部21の出力電圧は比較器17の基準電圧よ
り低く比較器17の出力はLレベルであり、また比較器
18の基準電圧20より高いため比較器18の出力もL
レベルとなり欠相検出部14の出力は正常状態を示すレ
ベルが出力される。Referring to FIGS. 1 and 2, in a normal state, the input currents of the R, S, and T phases are as shown in FIG. 2, and the output voltage of the input current detector 21 is lower than the reference voltage of the comparator 17. The output of the comparator 17 is at L level and is higher than the reference voltage 20 of the comparator 18, so the output of the comparator 18 is also L level.
The output of the open-phase detector 14 is at a level indicating a normal state.
【0009】R相が欠相した場合、抵抗22の両端の電
圧は、図2に示されるようにピークの大きなパルス状の
電圧となり入力電流検出部21の出力は正常状態より高
い電圧が出力され比較器17の出力はHレベルとなり欠
相検出部14は電源投入切断制御部4に欠相検出信号を
送出する。電源投入切断制御部4は、DC−DCコンバ
ータ部に対し切断指示を行うかまたは、欠相状態である
ことを警告する。S相欠相の場合もR相の場合と同じで
ある。When the R phase is open, the voltage across the resistor 22 becomes a pulsed voltage with a large peak as shown in FIG. 2, and the output of the input current detector 21 is higher than in the normal state. The output of the comparator 17 becomes H level, and the open-phase detection section 14 sends the open-phase detection signal to the power-on / off control section 4. The power-on / off control unit 4 issues a disconnection instruction to the DC-DC converter unit or warns that the phase is in the open phase state. The case of the S phase open phase is the same as that of the R phase.
【0010】T相が欠相した場合図2に示されるように
入力電流検出部の出力は比較器18の基準電圧より低く
なり比較器18の出力はHレベルとなる。またDC−D
Cコンバータ部の入力電流が流れている場合DC−DC
コンバータ入力電流検出部13の出力はHレベルであり
アンド回路16の出力はHレベルとなり欠相検出部14
の出力は欠相検出信号を電源切断投入制御部4に送出し
電源投入切断制御部4はDC−DCコンバータ部2に切
断指示するするかまたは欠相状態であることを警告す
る。DC−Dコンバータ部の入力電流がない場合は、D
C−DCコンバータ入力電流検出部13の出力はLとな
る。この時比較器18の出力はHとなっているがアンド
回路16の出力はLであるため、欠相検出部の出力は、
正常状態を示すLレベルを出力する。When the T phase is out of phase, the output of the input current detector becomes lower than the reference voltage of the comparator 18 and the output of the comparator 18 becomes H level as shown in FIG. DC-D
When the input current of the C converter is flowing DC-DC
The output of the converter input current detection unit 13 is at H level, and the output of the AND circuit 16 is at H level.
The output of the signal is sent to the power-off / on control unit 4 and the power-on / off control unit 4 instructs the DC-DC converter unit 2 to disconnect or warns that the phase is off. If there is no input current to the DC-D converter, D
The output of the C-DC converter input current detection unit 13 becomes L. At this time, the output of the comparator 18 is H, but the output of the AND circuit 16 is L. Therefore, the output of the open-phase detector is
The L level indicating a normal state is output.
【0011】また上記検出方式は入力電流を検出して欠
相検出を行っているため欠相状態となっても入力電流が
定格電流より低い場合は異常と判断しないため、直流安
定化電源の信頼性を高くすることができる。Further, in the above detection method, since the input current is detected and the open phase is detected, if the input current is lower than the rated current, it is not judged as abnormal even in the open phase state. It is possible to increase the sex.
【0012】[0012]
【発明の効果】本発明は、三相電源の入力電流を監視し
欠相検出することにより、整流平滑部の信頼性を高め、
また欠相した場合でも入力電流が一定値以下であればD
C−DCコンバータ部を停止させないため直流安定化電
源装置としての信頼性を高めるという効果がある。The present invention improves the reliability of the rectifying / smoothing section by monitoring the input current of the three-phase power supply and detecting the open phase.
If the input current is below a certain value even if the phase is lost, D
Since the C-DC converter unit is not stopped, there is an effect that the reliability as the DC stabilized power supply device is enhanced.
【図1】本発明の一実施例を示す図。FIG. 1 is a diagram showing an embodiment of the present invention.
【図2】本発明の一実施例の動作を示す図。FIG. 2 is a diagram showing the operation of one embodiment of the present invention.
1 整流平滑部 2 DC−DCコンバータ部 3 負荷 4 電源投入切断制御部 5 不足電圧検出部 6〜11 ダイオード 12 平滑用コンデンサ 13 DC−DCコンバータ入力電流検出部 14 欠相検出部 15 オア回路 16 アンド回路 17、18 比較器 19、20 基準電圧 21 入力電流検出部 22 平滑コンデンサ 23 ダイオード 24 抵抗 25 カレントトランス DESCRIPTION OF SYMBOLS 1 rectification smoothing part 2 DC-DC converter part 3 load 4 power supply on / off control part 5 undervoltage detection part 6-11 diode 12 smoothing capacitor 13 DC-DC converter input current detection part 14 open phase detection part 15 OR circuit 16 AND Circuits 17 and 18 Comparators 19 and 20 Reference voltage 21 Input current detector 22 Smoothing capacitor 23 Diode 24 Resistor 25 Current transformer
Claims (1)
滑整流部とこの平滑整流部から供給される電圧を安定な
電圧に変換するDC−DCコンバータ部と、このDC−
DCコンバータ部の投入および切断を制御する電源投入
切断制御部と、前記三相交流電源の入力電流を監視する
入力電流検出部と、前記DC−DCコンバータ部の入力
電流を検出するDC−DCコンバータ入力電流検出部と
前記入力電流検出部とDC−DCコンバータ入力電源検
出部の出力を入力し欠相を検出して前記電源投入切断制
御部へ出力する欠相検出部を含むことを特徴とする直流
安定化電源の欠相検出回路。1. A smoothing rectification unit for converting AC of a three-phase AC power supply into DC, a DC-DC converter unit for converting a voltage supplied from this smoothing rectification unit into a stable voltage, and this DC-DC converter unit.
A power-on / off control unit that controls turning on and off of the DC converter unit, an input current detection unit that monitors an input current of the three-phase AC power supply, and a DC-DC converter that detects an input current of the DC-DC converter unit. An input current detection unit, an input current detection unit, and a phase loss detection unit for inputting the outputs of the DC-DC converter input power supply detection unit to detect a phase loss and output it to the power-on / off control unit. Open-phase detection circuit for DC stabilized power supply.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5326762A JP2739814B2 (en) | 1993-12-24 | 1993-12-24 | Open phase detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5326762A JP2739814B2 (en) | 1993-12-24 | 1993-12-24 | Open phase detection circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07184316A true JPH07184316A (en) | 1995-07-21 |
JP2739814B2 JP2739814B2 (en) | 1998-04-15 |
Family
ID=18191411
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5326762A Expired - Lifetime JP2739814B2 (en) | 1993-12-24 | 1993-12-24 | Open phase detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2739814B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005012928A1 (en) * | 2003-07-30 | 2005-02-10 | Kabushiki Kaisha Yaskawa Denki | Method for detecting open-phase of power supply of three-phase converter |
WO2006038544A1 (en) * | 2004-10-04 | 2006-04-13 | Daikin Industries, Ltd. | Power supply circuit protecting method and apparatus for the same |
JP2010187521A (en) * | 2009-01-16 | 2010-08-26 | Mitsubishi Electric Corp | Motor drive controller, compressor, blower, air conditioner and refrigerator or freezer |
CN102879656A (en) * | 2012-09-25 | 2013-01-16 | 广东志高暖通设备股份有限公司 | Method for detecting phase loss or phase dislocation of three-phase power |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6132901A (en) * | 1984-07-25 | 1986-02-15 | 樫尾 信祐 | Luminous display |
JPH0211366U (en) * | 1988-07-04 | 1990-01-24 | ||
JPH02179481A (en) * | 1988-12-28 | 1990-07-12 | Toshiba Corp | Apparatus for detecting missing phase of three-phase power source |
-
1993
- 1993-12-24 JP JP5326762A patent/JP2739814B2/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6132901A (en) * | 1984-07-25 | 1986-02-15 | 樫尾 信祐 | Luminous display |
JPH0211366U (en) * | 1988-07-04 | 1990-01-24 | ||
JPH02179481A (en) * | 1988-12-28 | 1990-07-12 | Toshiba Corp | Apparatus for detecting missing phase of three-phase power source |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005012928A1 (en) * | 2003-07-30 | 2005-02-10 | Kabushiki Kaisha Yaskawa Denki | Method for detecting open-phase of power supply of three-phase converter |
CN100447574C (en) * | 2003-07-30 | 2008-12-31 | 株式会社安川电机 | Open-phase detecting method of three-phase transformer |
WO2006038544A1 (en) * | 2004-10-04 | 2006-04-13 | Daikin Industries, Ltd. | Power supply circuit protecting method and apparatus for the same |
JP2006109583A (en) * | 2004-10-04 | 2006-04-20 | Daikin Ind Ltd | Protection method for power circuit, and its device |
AU2005290575B2 (en) * | 2004-10-04 | 2009-08-13 | Daikin Industries, Ltd. | Power supply circuit protecting method and apparatus for the same |
US7667941B2 (en) | 2004-10-04 | 2010-02-23 | Daikin Industries, Ltd. | Power supply circuit protecting method and apparatus for the same |
JP2011092003A (en) * | 2004-10-04 | 2011-05-06 | Daikin Industries Ltd | Method for protecting matrix converter and protecting apparatus therefor |
JP2010187521A (en) * | 2009-01-16 | 2010-08-26 | Mitsubishi Electric Corp | Motor drive controller, compressor, blower, air conditioner and refrigerator or freezer |
JP2012196142A (en) * | 2009-01-16 | 2012-10-11 | Mitsubishi Electric Corp | Motor drive control device, compressor, air blower, air conditioner, and refrigerator or freezer |
JP2012231672A (en) * | 2009-01-16 | 2012-11-22 | Mitsubishi Electric Corp | Motor drive control device, compressor, air blower, air conditioner and refrigerator or freezer |
JP2012231671A (en) * | 2009-01-16 | 2012-11-22 | Mitsubishi Electric Corp | Motor drive control device, compressor, air blower, air conditioner and refrigerator or freezer |
CN102879656A (en) * | 2012-09-25 | 2013-01-16 | 广东志高暖通设备股份有限公司 | Method for detecting phase loss or phase dislocation of three-phase power |
Also Published As
Publication number | Publication date |
---|---|
JP2739814B2 (en) | 1998-04-15 |
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Legal Events
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A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19971224 |