JPH04355669A - Control circuit for inverter - Google Patents

Control circuit for inverter

Info

Publication number
JPH04355669A
JPH04355669A JP3153755A JP15375591A JPH04355669A JP H04355669 A JPH04355669 A JP H04355669A JP 3153755 A JP3153755 A JP 3153755A JP 15375591 A JP15375591 A JP 15375591A JP H04355669 A JPH04355669 A JP H04355669A
Authority
JP
Japan
Prior art keywords
inverter
power
control circuit
current
apparent power
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
JP3153755A
Other languages
Japanese (ja)
Inventor
Kouji Funamoto
船元 孝二
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.)
Fuji Electric Co Ltd
Original Assignee
Fuji Electric Co 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 Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP3153755A priority Critical patent/JPH04355669A/en
Publication of JPH04355669A publication Critical patent/JPH04355669A/en
Pending legal-status Critical Current

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  • Inverter Devices (AREA)

Abstract

PURPOSE:To protect an inverter by preventing an output from exceeding a rated value to an excess. CONSTITUTION:In addition to a PI regulator 7 for detecting a current corresponding to an apparent power from an output current of an inverter 2 and so controlling it as to become equal to a set value, a PI regulator 10 for detecting a current corresponding to an effective power and so controlling it as to become equal to the set value, is provided to prevent both the apparent power and the effective power from exceeding rated values, thereby protecting the inverter.

Description

【発明の詳細な説明】[Detailed description of the invention]

【0001】0001

【産業上の利用分野】この発明は、インバータ制御回路
に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter control circuit.

【0002】0002

【従来の技術】図2にこの種の従来回路を示す。同図に
おいて、1は直流電源、2はスイッチング素子T1〜T
4等からなるインバータ回路、3は変流器、4はフィル
タ、5は電流検出回路、6は設定器、7はPI調節器で
ある。すなわち、変流器3および電流検出回路5を介し
て皮相電力相当分の電流を検出し、PI調節器7により
これを設定器6からの設定値と一致するように、インバ
ータ回路2の各スイッチング素子T1〜T4を駆動する
ことにより、出力負荷(皮相電力)が定格を越えないよ
うに制御するものである。
2. Description of the Related Art FIG. 2 shows a conventional circuit of this type. In the same figure, 1 is a DC power supply, 2 is a switching element T1 to T
3 is a current transformer, 4 is a filter, 5 is a current detection circuit, 6 is a setting device, and 7 is a PI regulator. That is, a current equivalent to the apparent power is detected via the current transformer 3 and the current detection circuit 5, and each switching of the inverter circuit 2 is adjusted so that the current corresponds to the setting value from the setting device 6 using the PI controller 7. By driving the elements T1 to T4, the output load (apparent power) is controlled so as not to exceed the rated value.

【0003】0003

【発明が解決しようとする課題】しかしながら、このよ
うな回路では皮相電力相当の電流を検出してこれを制御
するようにしているため、負荷の力率が大きくなると、
皮相電力は定格を越えなくとも有効電力が定格を越えて
しまうという問題がある。したがって、この発明は課題
は負荷の力率の如何にかかわらず皮相電力,有効電力と
もに定格を越えないようにし、インバータ回路の保護を
図ることにある。
[Problem to be Solved by the Invention] However, since such a circuit detects and controls a current equivalent to the apparent power, when the power factor of the load increases,
There is a problem in that even though the apparent power does not exceed the rating, the effective power exceeds the rating. Therefore, the object of the present invention is to protect the inverter circuit by preventing both the apparent power and the active power from exceeding the ratings, regardless of the power factor of the load.

【0004】0004

【課題を解決するための手段】このような課題を解決す
るため、この発明では、皮相電力と有効電力の2つの定
格を持つインバータ装置の出力電流を検出してその皮相
電力成分を一定値になるよう制御する第1の電流制御回
路と、同じく有効電力成分を一定値になるよう制御する
第2の電流制御回路とを設け、皮相電力,有効電力とも
に定格値を越えないように制御することを特徴としてい
る。
[Means for Solving the Problems] In order to solve the above problems, the present invention detects the output current of an inverter device having two ratings of apparent power and active power, and sets the apparent power component to a constant value. A first current control circuit that controls the active power component so as to have a constant value, and a second current control circuit that similarly controls the active power component to a constant value are provided, and control is performed so that both the apparent power and the active power do not exceed the rated values. It is characterized by

【0005】[0005]

【作用】第1,第2電流制御回路を設けることにより、
力率の如何にかかわらず皮相電力,有効電力ともに定格
値を越えないようにし、インバータ回路の保護を図るよ
うにする。
[Operation] By providing the first and second current control circuits,
Regardless of the power factor, both the apparent power and the active power should not exceed the rated values to protect the inverter circuit.

【0006】[0006]

【実施例】図1にこの発明の実施例を示す。同図からも
明らかなように、この実施例は図2に示すものに対し、
電流検出回路8およびPI調節器10を付加した点が特
徴である。なお、9は設定器である。すなわち、電流検
出回路8により有効電力相当の電流を検出し、PI調節
器10によりこれを設定器9にて設定される設定値に一
致するように制御することにより、有効電力が定格を越
えないようにするものである。そして、PI調節器7お
よび10の出力をダイオード11,12を介して取り出
すことにより、出力負荷が過大になって皮相電力が定格
を越えたときはダイオード11を介してPI調節器7の
出力を取り出すことにより、また有効電力が定格を越え
たときはダイオード12を介してPI調節器10の出力
を取り出し、インバータ回路2のスイッチング素子T1
〜T4を駆動することにより、皮相電力,有効電力とも
に定格を越えないようにするもので、これによりインバ
ータ回路の安全を確保することができる。なお、ダイオ
ード11,12はオア回路を形成し、PI調節器7,1
0のいずれか小さい方の出力が優先して取り出されるこ
とになる。
Embodiment FIG. 1 shows an embodiment of the present invention. As is clear from the same figure, this embodiment has the following differences from the one shown in FIG.
It is characterized by the addition of a current detection circuit 8 and a PI regulator 10. Note that 9 is a setting device. That is, the current detection circuit 8 detects a current equivalent to the active power, and the PI controller 10 controls this so that it matches the setting value set by the setting device 9, so that the active power does not exceed the rating. It is intended to do so. By extracting the outputs of the PI regulators 7 and 10 via diodes 11 and 12, when the output load becomes excessive and the apparent power exceeds the rating, the output of the PI regulator 7 is extracted via the diode 11. When the active power exceeds the rated value, the output of the PI regulator 10 is taken out via the diode 12, and the switching element T1 of the inverter circuit 2 is
By driving T4, both the apparent power and the active power are prevented from exceeding the ratings, thereby ensuring the safety of the inverter circuit. Note that the diodes 11 and 12 form an OR circuit, and the PI regulators 7 and 1
The smaller output of 0 will be taken out with priority.

【0007】[0007]

【発明の効果】この発明によれば、負荷の力率の如何に
関係なく皮相電力,有効電力ともに定格を越えないよう
制御するようにしたので、出力容量が定格を越えて過大
になることを防止することができ、インバータの安全を
確保することが可能となる利点が得られる。
[Effects of the Invention] According to the present invention, both the apparent power and the active power are controlled so as not to exceed the ratings regardless of the power factor of the load, so that the output capacity is prevented from exceeding the ratings. This provides the advantage of being able to prevent this and ensure the safety of the inverter.

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

【図1】この発明の実施例を示す回路図である。FIG. 1 is a circuit diagram showing an embodiment of the present invention.

【図2】従来例を示す回路図である。FIG. 2 is a circuit diagram showing a conventional example.

【符号の説明】[Explanation of symbols]

1  直流電源 2  インバータ回路 3  変流器 4  フィルタ 5  電流検出回路 6  設定器 7  PI調節器 8  電流検出回路 9  設定器 10  PI調節器 11  ダイオード 12  ダイオード 1 DC power supply 2 Inverter circuit 3 Current transformer 4 Filter 5 Current detection circuit 6 Setting device 7 PI controller 8 Current detection circuit 9 Setting device 10 PI controller 11 Diode 12 Diode

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】  皮相電力と有効電力の2つの定格を持
つインバータ装置の出力電流を検出してその皮相電力成
分を一定値になるよう制御する第1の電流制御回路と、
同じく有効電力成分を一定値になるよう制御する第2の
電流制御回路とを設け、皮相電力,有効電力ともに定格
値を越えないように制御することを特徴とするインバー
タ制御回路。
1. A first current control circuit that detects the output current of an inverter device having two ratings of apparent power and active power and controls the apparent power component to a constant value;
An inverter control circuit comprising: a second current control circuit that also controls the active power component to a constant value, and controls the apparent power and the active power so that they do not exceed rated values.
JP3153755A 1991-05-30 1991-05-30 Control circuit for inverter Pending JPH04355669A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3153755A JPH04355669A (en) 1991-05-30 1991-05-30 Control circuit for inverter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3153755A JPH04355669A (en) 1991-05-30 1991-05-30 Control circuit for inverter

Publications (1)

Publication Number Publication Date
JPH04355669A true JPH04355669A (en) 1992-12-09

Family

ID=15569420

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3153755A Pending JPH04355669A (en) 1991-05-30 1991-05-30 Control circuit for inverter

Country Status (1)

Country Link
JP (1) JPH04355669A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017118782A (en) * 2015-12-25 2017-06-29 パナソニックIpマネジメント株式会社 Electric power conversion device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017118782A (en) * 2015-12-25 2017-06-29 パナソニックIpマネジメント株式会社 Electric power conversion device

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