JPH11235017A - Protection circuit of air cooled power converter - Google Patents

Protection circuit of air cooled power converter

Info

Publication number
JPH11235017A
JPH11235017A JP10048989A JP4898998A JPH11235017A JP H11235017 A JPH11235017 A JP H11235017A JP 10048989 A JP10048989 A JP 10048989A JP 4898998 A JP4898998 A JP 4898998A JP H11235017 A JPH11235017 A JP H11235017A
Authority
JP
Japan
Prior art keywords
converter
protection circuit
overcurrent
fan motor
circuit
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.)
Pending
Application number
JP10048989A
Other languages
Japanese (ja)
Inventor
Toshiyuki Kimura
利之 木村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyo Electric Manufacturing Ltd
Original Assignee
Toyo Electric Manufacturing Ltd
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 Toyo Electric Manufacturing Ltd filed Critical Toyo Electric Manufacturing Ltd
Priority to JP10048989A priority Critical patent/JPH11235017A/en
Publication of JPH11235017A publication Critical patent/JPH11235017A/en
Pending legal-status Critical Current

Links

Landscapes

  • Dc-Dc Converters (AREA)
  • Power Conversion In General (AREA)
  • Inverter Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent breakdown of a DC/DC converter when an internal failure occurs in a DC fan and the D/DC converter becomes overloaded and moreover easily recognize a defective point by quickly turning off the power converter. SOLUTION: In a DC/DC converter 7 to supply one of the outputs of a DC/DC converter 7 to a control circuit 6 of an inverter main circuit 4 and the other to a fan motor 9 as the DC power supply, an over-current protection circuit 9 is provided between this DC/DC converter 7 and the fan motor 8, and when the impedance of the fan motor 8 is lowered to result in over-current, this over-current protection circuit 9 controls an over-current through operation of the over-current protection element and generates a fault detecting signal.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、インバータ等電力
変換装置の主スイッチング素子を冷却するためのファン
モータを具備する風冷式電力変換装置に係わり、ファン
モータが内部故障を発生した場合、直流/直流変換器が
過負荷状態となることを防止して、さらに制御回路に故
障信号の送信を行う風冷式電力変換装置の保護回路装置
に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wind-cooled power converter having a fan motor for cooling a main switching element of a power converter such as an inverter. The present invention relates to a protection circuit device for an air-cooled power converter that prevents an overload state of a DC / DC converter and transmits a failure signal to a control circuit.

【0002】[0002]

【従来の技術】従来知られている風冷式電力変換装置の
1例として、図3に示される。図3において、1は交流
入力電源、2は交流入力電源1を直流に変換するための
コンバータ、3はフィルタコンデンサ、4はインバータ
主回路部、5は負荷機、6はインバータ主回路部4の制
御回路、7はフィルタコンデンサ3の両端電圧を入力と
する直流/直流変換器、8は直流/直流変換器7の出力
側を電源とし、インバータ主回路部4のスイッチング素
子を冷却するためのファンモータ(以下DCファンと称
する)である。この回路で制御回路6の駆動用電源も直
流/直流変換器7より供給している。この様な回路構成
にする事により電力変換装置を駆動する。
2. Description of the Related Art FIG. 3 shows an example of a conventionally known air-cooled power converter. In FIG. 3, 1 is an AC input power supply, 2 is a converter for converting the AC input power supply 1 to DC, 3 is a filter capacitor, 4 is an inverter main circuit section, 5 is a load machine, and 6 is an inverter main circuit section 4. A control circuit, 7 is a DC / DC converter that receives the voltage across the filter capacitor 3 as an input, 8 is a fan that uses the output side of the DC / DC converter 7 as a power source, and cools a switching element of the inverter main circuit unit 4. It is a motor (hereinafter referred to as a DC fan). In this circuit, the driving power of the control circuit 6 is also supplied from the DC / DC converter 7. The power converter is driven by such a circuit configuration.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、従来の
電力変換装置において、DCファン8が内部故障を発生
して低インピーダンスになると、DCファン8の電源と
なっている直流/直流変換器7が過負荷状態となり、破
損してさらに制御回路6の電源が無くなるため、電力変
換装置を駆動することができないという不具合があっ
た。本発明は、前述の欠点を解決するためになされたも
のであり、その目的とするところは、DCファン8が内
部故障して、直流/直流変換器7が過負荷状態となった
ときに直流/直流変換器7が破損することを防止し、さ
らに電力変換装置の駆動を速やかに停止して、故障箇所
を容易に認識することができる電力変換装置を提供する
ことにある。
However, in the conventional power converter, when the DC fan 8 has an internal failure and has a low impedance, the DC / DC converter 7 which is the power supply of the DC fan 8 is over-driven. Since the power converter is in a load state, the power converter is damaged, and the power supply of the control circuit 6 is lost, the power converter cannot be driven. The present invention has been made in order to solve the above-mentioned drawbacks, and an object of the present invention is to provide a DC-DC converter 7 which has an internal failure and has a DC-DC converter 7 which is overloaded. An object of the present invention is to provide a power conversion device that can prevent the / DC converter 7 from being damaged, and further quickly stop the driving of the power conversion device, and can easily recognize a failure point.

【0004】[0004]

【課題を解決するための手段】つまり、その目的を達成
するための手段は、 1)請求項1において、直流/直流変換器の出力の一方
をインバータ主回路部の制御回路に、他方をファンモー
タに供給する保護回路装置であって、この直流/直流変
換器と前記ファンモータ間に過電流保護回路を備え、こ
の過電流保護回路はファンモータのインピーダンスが低
下して過電流状態となったとき、 過電流保護素子が作用
して過電流を抑制すると共に、故障検出信号を発生せし
めるよう構成したものである。
Means for achieving the object are as follows: 1) In claim 1, one of the outputs of the DC / DC converter is provided to a control circuit of an inverter main circuit portion and the other is provided to a fan. A protection circuit device for supplying to a motor, comprising an overcurrent protection circuit between the DC / DC converter and the fan motor, wherein the overcurrent protection circuit is in an overcurrent state due to a reduction in the impedance of the fan motor. At this time, the overcurrent protection element acts to suppress the overcurrent and generate a failure detection signal.

【0005】2) 請求項2において、過電流保護素子
に、ポリマー正抵抗温度係数(ポリマーPTC)、セラ
ミックPTC、バイメタル、ヒューズを用いるものであ
る。 3) 請求項3において、故障検出信号を発生させる素
子に、フォトカプラ、フォトサイリスタ、フォトリレー
を用いるものである。
2) The overcurrent protection device according to claim 2, wherein a polymer positive temperature coefficient of resistance (polymer PTC), a ceramic PTC, a bimetal, and a fuse are used. 3) In the third aspect, a photocoupler, a photothyristor, or a photorelay is used as an element for generating a failure detection signal.

【0006】その作用は、DCファンが内部故障を発生
した場合、過電流保護素子が作用して、直流/直流変換
器とDCファンの間を速やかに高インピーダンス又は切
り離し、直流/直流変換器の過負荷状態による破損を防
止することができるため、電力変換装置の破損箇所を最
小限にすることができる。 以下、本発明の1実施例を
図面に基づいて詳述する。
[0006] The effect of this is that when an internal failure occurs in the DC fan, the overcurrent protection element acts to quickly disconnect or separate the DC / DC converter and the DC fan from each other, and the DC / DC converter has a high impedance. Since damage due to the overload state can be prevented, the number of damaged parts of the power converter can be minimized. Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

【0007】[0007]

【発明の実施の形態】図1は本発明の1実施例を示すブ
ロック図であり、図中、図3と同符号のものは同じ構
成、機能を有する部分である。図1において、9は過電
流保護回路、10は故障検出信号である。すなわち、直
流/直流変換器7によるDCファン8の電源供給におい
て、直流/直流変換器7とDCファン8との間に過電流
保護回路9が配されてなり、さらには、過電流保護回路
9より制御回路6に故障検出信号10を与え得るもので
ある。次に、かような装置の具体例を挙げて説明する。
FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, the same reference numerals as those in FIG. 3 denote portions having the same configuration and function. In FIG. 1, 9 is an overcurrent protection circuit, and 10 is a failure detection signal. That is, in the power supply of the DC fan 8 by the DC / DC converter 7, the overcurrent protection circuit 9 is provided between the DC / DC converter 7 and the DC fan 8. More specifically, the failure detection signal 10 can be given to the control circuit 6. Next, a specific example of such an apparatus will be described.

【0008】図2は本発明の1実施例を示す回路図であ
り、図中、図1と同符号のものは同じ構成、機能を有す
る部分である。図2において、91はポリマーPTC、
セラミックPTC、バイメタル、ヒューズなどの過電流
保護素子、92は過電流保護素子91が作用したとき制
御回路6に故障検出信号10を送信するフォトカプラ、
フォトサイリスタ、フォトリレーなどの半導体素子、9
3は正常時に半導体素子92が動作するような電流を流
さないための抵抗である。
FIG. 2 is a circuit diagram showing one embodiment of the present invention. In FIG. 2, components having the same reference numerals as those in FIG. 1 are portions having the same configuration and function. In FIG. 2, 91 is a polymer PTC,
An overcurrent protection element such as a ceramic PTC, a bimetal, and a fuse; 92, a photocoupler that transmits a failure detection signal 10 to the control circuit 6 when the overcurrent protection element 91 operates;
Semiconductor devices such as photothyristors and photorelays, 9
Reference numeral 3 denotes a resistor for preventing a current from flowing such that the semiconductor element 92 operates in a normal state.

【0009】このような回路にすることにより、直流/
直流変換器7の出力側が過負荷状態となったときに、過
電流保護素子91が作用して、直流/直流変換器7とD
Cファン8の間を高インピーダンス又は切り離して過負
荷状態の原因である過電流を抑制する過電流保護回路9
を有する電力変換装置を構成してなる。すなわち、直流
/直流変換器7の出力側がファンモータ8のインピーダ
ンスの低下により過電流状態となり、過電流保護素子9
1がその過電流によって温度上昇する作用によって、直
流/直流変換器7とDCファン8の間を高インピーダン
ス又は切り離して過電流を抑制し、直流/直流変換器7
を保護する。また過電流保護素子91が作用した場合、
入力と出力に電位差が発生することにより半導体素子9
2を動作させ、制御回路6に故障検出信号10を送信す
る事ができるようにしたものである。
With such a circuit, the DC /
When the output side of the DC converter 7 is overloaded, the overcurrent protection element 91 operates and the DC / DC converter 7 and D
An overcurrent protection circuit 9 that suppresses an overcurrent that causes an overload state by separating or high impedance between the C fans 8
Is constituted. That is, the output side of the DC / DC converter 7 enters an overcurrent state due to a decrease in the impedance of the fan motor 8, and the overcurrent protection element 9
1 causes the DC / DC converter 7 and the DC fan 8 to have a high impedance or is cut off by suppressing the overcurrent by the action of increasing the temperature due to the overcurrent.
To protect. When the overcurrent protection element 91 operates,
The potential difference between the input and output causes the semiconductor element 9
2 is operated so that the failure detection signal 10 can be transmitted to the control circuit 6.

【0010】[0010]

【発明の効果】以上説明したように本発明によれば、電
力変換装置において過電流保護素子を有する保護回路を
加えることにより、直流/直流変換器が過負荷状態とな
った場合に保護することが出来、実用上、極めて有用性
の高いものである。
As described above, according to the present invention, protection is provided when a DC / DC converter is overloaded by adding a protection circuit having an overcurrent protection element in a power converter. It is extremely useful in practice.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の風冷式電力変換装置の1実施例を示す
ブロック図である。
FIG. 1 is a block diagram showing one embodiment of a wind-cooled power converter according to the present invention.

【図2】本発明の具体例の1実施例を示す回路図であ
る。
FIG. 2 is a circuit diagram showing one embodiment of a specific example of the present invention.

【図3】従来の風冷式電力変換装置の1例を示す回路図
である。
FIG. 3 is a circuit diagram showing an example of a conventional air-cooled power converter.

【符号の説明】[Explanation of symbols]

1 交流入力電源 2 コンバータ 3 フィルタコンデンサ 4 インバータ主回路部 5 負荷機 6 制御回路 7 直流/直流変換器 8 ファンモータ(DCファン) 9 過電流保護回路 91 過電流保護素子 92 半導体素子 93 抵抗 10 故障検出信号 DESCRIPTION OF SYMBOLS 1 AC input power supply 2 Converter 3 Filter capacitor 4 Inverter main circuit part 5 Load machine 6 Control circuit 7 DC / DC converter 8 Fan motor (DC fan) 9 Overcurrent protection circuit 91 Overcurrent protection element 92 Semiconductor element 93 Resistance 10 Failure Detection signal

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 直流/直流変換器の出力の一方をインバ
ータ主回路部の制御回路に、他方をファンモータに供給
する保護回路装置において、この直流/直流変換器と前
記ファンモータ間に過電流保護回路を備え、この過電流
保護回路はファンモータのインピーダンスが低下して過
電流状態となったとき、 過電流保護素子が作用して過電
流を抑制すると共に、故障検出信号を発生せしめるよう
構成したことを特徴とする風冷式電力変換装置の保護回
路装置。
In a protection circuit device for supplying one of an output of a DC / DC converter to a control circuit of an inverter main circuit unit and the other to a fan motor, an overcurrent between the DC / DC converter and the fan motor is provided. The overcurrent protection circuit has a protection circuit.When the impedance of the fan motor decreases and the overcurrent condition occurs, the overcurrent protection element works to suppress the overcurrent and generate a failure detection signal. A protection circuit device for an air-cooled power conversion device, characterized in that:
【請求項2】 過電流保護素子を、ポリマー正抵抗温度
係数、セラミック正抵抗温度係数、バイメタル、ヒュー
ズにより構成される回路を具備する請求項1記載の風冷
式電力変換装置の保護回路装置。
2. The protection circuit device for an air-cooled power converter according to claim 1, wherein the overcurrent protection element comprises a circuit composed of a polymer positive resistance temperature coefficient, a ceramic positive resistance temperature coefficient, a bimetal, and a fuse.
【請求項3】 故障検出信号を発生させる素子に、フォ
トカプラ、フォトサイリスタ、フォトリレーを用いる請
求項1又は2記載の風冷式電力変換装置の保護回路装
置。
3. The protection circuit device for an air-cooled power conversion device according to claim 1, wherein a photocoupler, a photothyristor, or a photorelay is used as an element for generating a failure detection signal.
JP10048989A 1998-02-13 1998-02-13 Protection circuit of air cooled power converter Pending JPH11235017A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10048989A JPH11235017A (en) 1998-02-13 1998-02-13 Protection circuit of air cooled power converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10048989A JPH11235017A (en) 1998-02-13 1998-02-13 Protection circuit of air cooled power converter

Publications (1)

Publication Number Publication Date
JPH11235017A true JPH11235017A (en) 1999-08-27

Family

ID=12818648

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10048989A Pending JPH11235017A (en) 1998-02-13 1998-02-13 Protection circuit of air cooled power converter

Country Status (1)

Country Link
JP (1) JPH11235017A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100782548B1 (en) 2006-08-01 2007-12-10 주식회사 서린건축사사무소 Device preventing over heat in fan

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100782548B1 (en) 2006-08-01 2007-12-10 주식회사 서린건축사사무소 Device preventing over heat in fan

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