JP2003333855A - Current detection circuit - Google Patents
Current detection circuitInfo
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- JP2003333855A JP2003333855A JP2002134846A JP2002134846A JP2003333855A JP 2003333855 A JP2003333855 A JP 2003333855A JP 2002134846 A JP2002134846 A JP 2002134846A JP 2002134846 A JP2002134846 A JP 2002134846A JP 2003333855 A JP2003333855 A JP 2003333855A
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- Japan
- Prior art keywords
- circuit
- wave
- rectifying
- current detection
- resistor
- Prior art date
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Rectifiers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はブリッジ型力率改善
回路における、入力電流検出回路に関する発明である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input current detection circuit in a bridge type power factor correction circuit.
【０００２】[0002]
【従来の技術】図５に昇圧チョッパ型力率改善回路にお
ける、入力電流検出回路の従来例を示す。なお、１はイ
ンダクタ、２は整流素子、４はスイッチ素子、８はコン
デンサである。制御回路の基準電位はＭＯＳＦＥＴのソ
ースとするのが、ＭＯＳＦＥＴの駆動が容易であること
から、一般的である。市販の制御ＩＣも、そのような前
提で作られていることが多い。2. Description of the Related Art FIG. 5 shows a conventional example of an input current detection circuit in a boost chopper type power factor correction circuit. 1 is an inductor, 2 is a rectifying element, 4 is a switching element, and 8 is a capacitor. The reference potential of the control circuit is generally used as the source of the MOSFET because it is easy to drive the MOSFET. Commercially available control ICs are often made on such a premise.
【０００３】図５の場合、制御回路の基準電位に電流検
出抵抗６が接続されているので、この抵抗６の電圧を直
接、制御回路で読むことができる。そしてこの抵抗６に
は、入力電流を全波整流した波形が流れており、その波
形は図９の様になる。マイナス側に検出されるのは、電
流が図５のIinで示した矢印の向きに流れるためであ
る。例えば富士電機の制御ＩＣ、ＦＡ５３３１は図９の
様な電流波形を入力するように設計されている。したが
って、図５の昇圧チョッパ型力率改善回路では、抵抗一
つで入力電流検出回路を実現できる。In the case of FIG. 5, since the current detection resistor 6 is connected to the reference potential of the control circuit, the voltage of this resistor 6 can be directly read by the control circuit. A waveform obtained by full-wave rectifying the input current flows through the resistor 6, and the waveform is as shown in FIG. The minus side is detected because the current flows in the direction of the arrow indicated by Iin in FIG. For example, the Fuji Electric control IC, FA5331, is designed to input a current waveform as shown in FIG. Therefore, in the boost chopper type power factor correction circuit of FIG. 5, the input current detection circuit can be realized by one resistor.
【０００４】[0004]
【発明が解決しようとする課題】ところが図６のような
ブリッジ型力率改善回路、具体的には、ブリッジ接続さ
れた四個の整流素子２，３，４，５と一つのコンデンサ
８からなり、インダクタ１を介して単相交流電源に接続
され負荷に直流電力を供給する全波整流回路と、前記整
流素子２，３，４，５のうち、入力端子が前記コンデン
サ８に接続されている二つの整流素子にそれぞれ並列に
接続された二つのスイッチ素子４，５とを備えたブリッ
ジ型力率改善回路では、そもそも回路構成が異なるた
め、これと同じ事ができない。However, a bridge-type power factor correction circuit as shown in FIG. 6, specifically, four bridge rectifying elements 2, 3, 4, 5 and one capacitor 8 are used. , A full-wave rectifier circuit connected to a single-phase AC power source via an inductor 1 to supply DC power to a load, and an input terminal of the rectifier elements 2, 3, 4, 5 is connected to the capacitor 8. The bridge type power factor correction circuit including the two rectifying elements and the two switching elements 4 and 5 connected in parallel cannot perform the same thing because the circuit configuration is different from the beginning.
【０００５】図７の様に入力側に電流検出抵抗６を挿入
すれば、このラインには入力電流それ自体が流れている
ので、入力電流を検出する事が可能である。しかし制御
回路の基準電位はＭＯＳＦＥＴのソースとするのが、Ｍ
ＯＳＦＥＴの駆動が容易であることから一般的である事
を考えると、電流検出抵抗６の電位は制御回路とは異な
る事になる。したがって、読みとった電圧をそのまま制
御回路に入力することはできない。何らかの手段で電位
を変換する必要がある。If the current detection resistor 6 is inserted on the input side as shown in FIG. 7, the input current itself flows through this line, so that the input current can be detected. However, the reference potential of the control circuit is the source of the MOSFET.
Considering that it is general because the OSFET is easily driven, the potential of the current detection resistor 6 is different from that of the control circuit. Therefore, the read voltage cannot be directly input to the control circuit. It is necessary to convert the electric potential by some means.
【０００６】ここで扱う情報は、オンオフのデジタル情
報ではなく、アナログ情報であるので、アナログ情報を
扱える電位変換手段が必要である。例えば絶縁アンプを
使う方法が考えられるが、これにはいくつかの問題があ
る。第一の問題は絶縁アンプ用の電源が必要なことであ
る。このための電源回路を組むと、それだけ部品点数が
増え、大型化、コストアップにつながる。第二の問題
は、絶縁アンプ自体が高価であることである。このよう
に、図７の回路では、電流検出は抵抗一つでも、それに
必要となる電位変換手段が高コストになる問題があっ
た。Since the information handled here is analog information rather than on / off digital information, a potential conversion means capable of handling analog information is required. For example, an isolation amplifier can be used, but this has some problems. The first problem is the need for a power supply for the isolation amplifier. If a power supply circuit for this purpose is assembled, the number of parts increases, which leads to increase in size and cost. The second problem is that the isolation amplifier itself is expensive. As described above, in the circuit of FIG. 7, there is a problem that even if only one resistor is used for current detection, the potential conversion means required for it becomes expensive.
【０００７】図８の様に入力側に電流検出抵抗６を挿入
する代わりに、カレントトランス１４を挿入すれば、こ
のラインには入力電流それ自体が流れているので、入力
電流を検出する事が可能である。トランスなので異なる
巻線は電位的に独立している。したがって、電流検出抵
抗を挿入した場合と異なり、電位変換の必要もない。し
かしながら、ここで扱う入力電流の周波数は５０〜６０
Ｈｚといった低周波数であるため、カレントトランスが
大型化する問題があった。If the current transformer 14 is inserted instead of inserting the current detecting resistor 6 on the input side as shown in FIG. 8, the input current itself flows in this line, so that the input current may be detected. It is possible. Since it is a transformer, the different windings are potential independent. Therefore, unlike the case where the current detection resistor is inserted, there is no need for potential conversion. However, the frequency of the input current handled here is 50 to 60.
Since the frequency is as low as Hz, there is a problem that the current transformer becomes large.
【０００８】また、過大電流が流れたときにカレントト
ランスが飽和してしまう問題もある。飽和してしまえば
検出巻線に電流は流れなくなり、電流を検出することは
できない。過大電流が流れた時にこそ、それを検出して
保護回路を働かせる事が必要であるのに、それができな
くなる問題があった。以上のようにブリッジ型力率改善
回路では、入力電流検出回路の実現に当たって様々な問
題があった。There is also a problem that the current transformer is saturated when an excessive current flows. Once saturated, no current flows in the detection winding, and no current can be detected. Only when an excessive current flows, it is necessary to detect it and activate the protection circuit, but there was a problem that it could not be done. As described above, the bridge type power factor correction circuit has various problems in realizing the input current detection circuit.
【０００９】[0009]
【課題を解決するための手段】ブリッジ接続された四個
の整流素子と一つのコンデンサからなり、インダクタを
介して単相交流電源に接続され負荷に直流電力を供給す
る全波整流回路と、前記整流素子のうち、入力端子が前
記コンデンサに接続されている二つの整流素子にそれぞ
れ並列に接続された二つのスイッチ素子とを備えた電力
変換装置において、前記スイッチ素子と整流素子の並列
回路に直列にそれぞれ第一の抵抗と第二の抵抗を挿入
し、前記第一の抵抗の電圧を半波整流する第一の半波整
流回路と前記第二の抵抗の電圧を半波整流する第二の半
波整流回路と、前記第一の半波整流回路と第二の半波整
流回路の出力を加算する加算回路とを備える事により、
課題を解決する。A full-wave rectifier circuit comprising four rectifying elements connected in bridge and one capacitor, connected to a single-phase AC power source via an inductor and supplying DC power to a load, Among the rectifying elements, in a power conversion device including two rectifying elements each having an input terminal connected to the capacitor, and two rectifying elements each connected in parallel, the rectifying elements are connected in series with a parallel circuit of the switching element and the rectifying element. The first resistor and the second resistor are respectively inserted into a first half-wave rectifying circuit for half-wave rectifying the voltage of the first resistor and a second half-wave rectifying circuit for half-wave rectifying the voltage of the second resistor. By including a half-wave rectifier circuit and an adder circuit that adds the outputs of the first half-wave rectifier circuit and the second half-wave rectifier circuit,
Solve the problem.
【００１０】[0010]
【発明の実施の形態】図１に本発明の一実施例を示す。
この実施例は、前記従来例と同様に、ブリッジ接続され
た四個の整流素子２，３，４，５と一つのコンデンサ８
からなり、インダクタ１を介して単相交流電源に接続さ
れ負荷に直流電力を供給する全波整流回路と、前記整流
素子２，３，４，５のうち、入力端子が前記コンデンサ
８に接続されている二つの整流素子にそれぞれ並列に接
続された二つのスイッチ素子４，５とを備えている。な
お、本実施例では、スイッチ素子４，５がＭＯＳＦＥＴ
で構成してあり、ＭＯＳＦＥＴのボディーダイオードが
整流素子の役割をする。1 shows an embodiment of the present invention.
In this embodiment, like the above-mentioned conventional example, four rectifying elements 2, 3, 4, 5 connected in a bridge and one capacitor 8 are connected.
And a full-wave rectifier circuit connected to a single-phase AC power source via an inductor 1 to supply DC power to a load, and an input terminal of the rectifier elements 2, 3, 4, 5 connected to the capacitor 8. The two rectifying elements are provided with two switch elements 4 and 5 connected in parallel. In this embodiment, the switch elements 4 and 5 are MOSFETs.
The body diode of the MOSFET functions as a rectifying element.
【００１１】図１に示す６，７は電流検出抵抗である。
前記スイッチ素子４，５と整流素子２，３の直列回路に
直列にそれぞれ第一の抵抗６と第二の抵抗７を挿入し、
前記第一の抵抗６の電圧を半波整流する第一の半波整流
回路９と、前記第二の抵抗７の電圧を半波整流する第二
の半波整流回路１０と、前記第一の半波整流回路９と第
二の半波整流回路１０の出力を加算する加算回路１１と
を備えている。Reference numerals 6 and 7 shown in FIG. 1 are current detection resistors.
The first resistor 6 and the second resistor 7 are inserted in series in the series circuit of the switch elements 4 and 5 and the rectifying elements 2 and 3, respectively,
A first half-wave rectifying circuit 9 that half-wave rectifies the voltage of the first resistor 6, a second half-wave rectifying circuit 10 that half-wave rectifies the voltage of the second resistor 7, and the first half-wave rectifying circuit 10. It is provided with a half-wave rectifier circuit 9 and an adder circuit 11 that adds the outputs of the second half-wave rectifier circuit 10.
【００１２】力率改善回路は、入力電流波形を入力電圧
波形と相似になるように制御し、かつ出力電圧を一定に
保つように動作する。このとき抵抗６，７に流れる電流
の波形は、図３(A)、(B)の様になる。The power factor correction circuit controls the input current waveform so as to be similar to the input voltage waveform, and operates so as to keep the output voltage constant. At this time, the waveforms of the currents flowing through the resistors 6 and 7 are as shown in FIGS. 3 (A) and 3 (B).
【００１３】図で上から下に流れる向きをプラスとする
と、抵抗６，７の電流は、プラス側ではスイッチングさ
れているが、マイナス側では連続となっている。これは
電流がプラス側の場合はスイッチ素子４，５のオン・オ
フによって電流が流れるか流れないかが決まるが、電流
がマイナス側の場合スイッチ素子４，５のオンオフによ
らず、それと並列の整流素子４，５を通過して流れる為
である。図1の場合は、スイッチ素子４，５がＭＯＳＦ
ＥＴなので、そのボディダイオードを通過して電流が流
れる為、連続となる。Assuming that the direction of flow from top to bottom in the figure is positive, the currents of the resistors 6 and 7 are switched on the positive side, but continuous on the negative side. When the current is on the plus side, whether the current flows or not depends on the on / off of the switching elements 4 and 5, but when the current is on the minus side, the rectification in parallel with it does not depend on the on / off of the switching elements 4 and 5. This is because it flows through the elements 4 and 5. In the case of FIG. 1, the switching elements 4 and 5 are MOSFs.
Since it is ET, a current flows through the body diode, so that it is continuous.
【００１４】この波形を半波整流回路９，１０に入力
し、マイナス側の電流連続の部分だけを取り出すと、図
３(C)、(D)の様になる。そして図３(C)、(D)の二つの波
形を加算すると、目的である入力電流波形図３(E)が得
られるのである。When this waveform is input to the half-wave rectifier circuits 9 and 10 and only the portion of the current on the negative side is taken out, it becomes as shown in FIGS. 3C and 3D. Then, by adding the two waveforms of FIGS. 3 (C) and 3 (D), the target input current waveform diagram 3 (E) is obtained.
【００１５】半波整流回路９，１０と加算回路１１の実
施例として、オペアンプ１８，２５，３０を使用した回
路を図４に示す。As an embodiment of the half-wave rectifier circuits 9 and 10 and the adder circuit 11, a circuit using operational amplifiers 18, 25 and 30 is shown in FIG.
【００１６】具体的に、半波整流回路９は、オペアンプ
２５を備え、正の入力側並びに負の入力側に抵抗２２，
２３を介してあり、負の入力と出力と並列に抵抗２４を
接続し、さらに、この抵抗２４とダイオード２６のカソ
ードを、このダイオード２６のアノードとオペアンプ２
５の出力とを接続し、同じくオペアンプ２５の出力には
別のダイオード２７のカソードと接続し、このダイオー
ド２７のアノードはオペアンプ２５の負の入力側に接続
してある。Specifically, the half-wave rectifier circuit 9 includes an operational amplifier 25, and has resistors 22 on the positive input side and the negative input side.
23, a resistor 24 is connected in parallel with the negative input and output, and the resistor 24 and the cathode of the diode 26 are connected to the anode of the diode 26 and the operational amplifier 2
The output of the operational amplifier 25 is connected to the cathode of another diode 27, and the anode of the diode 27 is connected to the negative input side of the operational amplifier 25.
【００１７】半波整流回路１０もオペアンプ１８、抵抗
１５，１６，１７、ダイオード１９，２０を備えてあ
り、半波整流回路９と同様の構成をしている。The half-wave rectifier circuit 10 is also provided with an operational amplifier 18, resistors 15, 16, 17 and diodes 19, 20 and has the same structure as the half-wave rectifier circuit 9.
【００１８】加算回路１１は、オペアンプ３０を備え、
このオペアンプ３０の負の入力を、抵抗２１，抵抗１８
を介して、半波整流回路９，１０に接続してある。ま
た、正の入力には抵抗２９を接続し、負の入力と出力と
並列に抵抗３１を接続している。The adder circuit 11 includes an operational amplifier 30,
The negative input of the operational amplifier 30 is connected to the resistor 21 and the resistor 18
Is connected to the half-wave rectifier circuits 9 and 10. A resistor 29 is connected to the positive input, and a resistor 31 is connected in parallel with the negative input and output.
【００１９】この実施例では半波整流回路９，１０も加
算回路１１も波形を反転させる回路となっているが、二
回反転させるので最終的に得られる波形は図３(E)と等
しい。In this embodiment, both the half-wave rectifier circuits 9 and 10 and the adder circuit 11 are circuits for inverting the waveform, but since they are inverted twice, the finally obtained waveform is the same as that in FIG. 3 (E).
【００２０】さて、実際の応用では半波整流回路９，１
０の前段に増幅回路１２，１３を入れる事も多い。これ
は大電力出力のＰＦＣで、抵抗６、７の損失が大きくな
りすぎることを防ぐためである。増幅回路１２，１３を
入れた場合の実施例を図２に示す。Now, in an actual application, the half-wave rectifying circuit 9, 1 is used.
In many cases, amplifier circuits 12 and 13 are inserted before 0. This is to prevent the loss of the resistors 6 and 7 from becoming too large in the PFC of high power output. An embodiment in which the amplifier circuits 12 and 13 are inserted is shown in FIG.
【００２１】また、図１、２では、出力端子がコンデン
サ８に接続されている二つの整流素子２，３があるが、
これら整流素子２，３のそれぞれ並列に、スイッチ素子
を接続することが可能である。このような回路方式でも
抵抗６，７に流れる電流の波形は、図３(A)、(B)と変わ
らないため、本発明を適用する事ができる。また、この
場合におけるスイッチ素子にＭＯＳＦＥＴを使用すれ
ば、ＭＯＳＦＥＴのボディーダイオードが整流素子の役
割をするため、整流素子２，３を省略することができ
る。1 and 2, there are two rectifying elements 2 and 3 whose output terminals are connected to the capacitor 8,
A switch element can be connected in parallel with each of these rectifying elements 2 and 3. Even with such a circuit system, the waveforms of the currents flowing through the resistors 6 and 7 are the same as those in FIGS. 3A and 3B, and thus the present invention can be applied. If a MOSFET is used as the switch element in this case, the body diode of the MOSFET functions as a rectifying element, and thus the rectifying elements 2 and 3 can be omitted.
【００２２】[0022]
【発明の効果】以上のように本発明によれば、ブリッジ
型力率改善回路において、通常の昇圧チョッパ型力率改
善回路における入力電流検出波形と同等の波形を得るこ
とが可能である。したがって既存の昇圧チョッパ型力率
改善回路用制御ＩＣを使用することが可能となり、これ
を使わず個別部品で同等の制御回路を組んだ場合と比べ
て、大幅な部品点数の削減となる効果がある。As described above, according to the present invention, in the bridge type power factor correction circuit, it is possible to obtain a waveform equivalent to the input current detection waveform in the normal boost chopper type power factor correction circuit. Therefore, it is possible to use the existing control IC for the boost chopper type power factor correction circuit, and it is possible to significantly reduce the number of parts as compared with the case where an equivalent control circuit is formed by using individual parts without using this. is there.
【００２３】また、本発明では、入力電流検出波形を得
るのにカレントトランスを使用していないため、異常時
に大電流が流れたときに飽和する心配がないメリットも
ある。Further, in the present invention, since the current transformer is not used to obtain the input current detection waveform, there is also an advantage that there is no fear of saturation when a large current flows in an abnormal condition.
【図１】本発明の一実施例である。FIG. 1 is an example of the present invention.
【図２】本発明の他の実施例である。FIG. 2 is another embodiment of the present invention.
【図３】図１の回路における電流検出波形である。FIG. 3 is a current detection waveform in the circuit of FIG.
【図４】半波整流回路と加算回路の一例である。FIG. 4 is an example of a half-wave rectification circuit and an addition circuit.
【図５】従来の昇圧チョッパ型力率改善回路の回路図で
ある。FIG. 5 is a circuit diagram of a conventional boost chopper type power factor correction circuit.
【図６】ブリッジ型力率改善回路の回路図である。FIG. 6 is a circuit diagram of a bridge type power factor correction circuit.
【図７】電流検出回路の一例である。FIG. 7 is an example of a current detection circuit.
【図８】電流検出回路の他の例である。FIG. 8 is another example of a current detection circuit.
【図９】図５の回路における電流検出波形である。9 is a current detection waveform in the circuit of FIG.
１ インダクタ ２、３ 整流素子 ４、５ スイッチ素子（整流素子） ６、７ 抵抗 ８ コンデンサ ９、１０ 半波整流回路 １１ 加算回路 １２、１３ 増幅回路 １４ カレントトランス １５、１６、１７ 抵抗 １８ オペアンプ １９、２０ 整流素子 ２１〜２４ 抵抗 ２５ オペアンプ ２６、２７ 整流素子 ２８、２９ 抵抗 ３０ オペアンプ ３１ 抵抗 1 inductor A few rectifiers 4, 5 switch element (rectifier element) 6, 7 resistance 8 capacitors 9,10 Half-wave rectifier circuit 11 adder circuit 12, 13 Amplifier circuit 14 Current Transformer 15, 16, 17 resistance 18 operational amplifier 19, 20 Rectifying element 21-24 resistance 25 operational amplifier 26, 27 Rectifying element 28, 29 resistance 30 operational amplifier 31 resistance
Claims (6)
のコンデンサからなり、インダクタを介して単相交流電
源に接続され負荷に直流電力を供給する全波整流回路
と、前記整流素子のうち、入力端子が前記コンデンサに
接続されている二つの整流素子にそれぞれ並列に接続さ
れた二つのスイッチ素子とを備えた電力変換装置におい
て、前記スイッチ素子と整流素子の並列回路に直列にそ
れぞれ第一の抵抗と第二の抵抗を挿入し、前記第一の抵
抗の電圧を半波整流する第一の半波整流回路と、前記第
二の抵抗の電圧を半波整流する第二の半波整流回路と、
前記第一の半波整流回路と第二の半波整流回路の出力を
加算する加算回路とを備えたことを特徴とする電流検出
回路。1. A full-wave rectifier circuit comprising four rectifying elements bridge-connected and one capacitor, connected to a single-phase AC power source via an inductor to supply DC power to a load, and the rectifying element among the rectifying elements. A power conversion device comprising two rectifying elements each having an input terminal connected to the capacitor and two rectifying elements each connected in parallel, the first rectifying element being connected in series with a parallel circuit of the rectifying element. A first half-wave rectification circuit for inserting a first resistance and a second resistance into half-wave rectification of the voltage of the first resistance, and a second half-wave rectification for half-wave rectification of the voltage of the second resistance. Circuit,
A current detection circuit comprising: a first half-wave rectifier circuit and an adder circuit that adds the outputs of the second half-wave rectifier circuit.
回路の入力にそれぞれ第一の増幅回路と第二の増幅回路
を備えたことを特徴とする請求項１記載の電流検出回
路。2. The current according to claim 1, wherein a first amplifier circuit and a second amplifier circuit are provided at the inputs of the first half-wave rectifier circuit and the second half-wave rectifier circuit, respectively. Detection circuit.
デンサに接続されている二つの整流素子に、それぞれ並
列にスイッチ素子が接続された電力変換装置に適用され
たことを特徴とする請求項１あるいは請求項２記載の電
流検出回路。3. The power conversion device according to claim 1, wherein among the rectifying elements, two rectifying elements whose output terminals are connected to the capacitor are respectively connected to switching elements in parallel. The current detection circuit according to claim 1 or claim 2.
前記スイッチ素子との並列回路に備えた整流素子を、前
記ＭＯＳＦＥＴのボディーダイオードが代用しているこ
とを特徴とする請求項１、請求項２あるいは請求項３記
載の電流検出回路。4. The switch element is a MOSFET,
4. The current detection circuit according to claim 1, wherein the body diode of the MOSFET substitutes for a rectifying element provided in a parallel circuit with the switch element.
とを特徴とする請求項１、請求項２、請求項３あるいは
請求項４記載の電流検出回路。5. The current detection circuit according to claim 1, wherein the half-wave rectifier circuit is provided with an operational amplifier.
特徴とする請求項１、請求項２、請求項３、請求項４あ
るいは請求項５記載の電流検出回路。6. The current detection circuit according to claim 1, claim 2, claim 3, claim 4, or claim 5, wherein the adder circuit includes an operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002134846A JP2003333855A (en) | 2002-05-10 | 2002-05-10 | Current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002134846A JP2003333855A (en) | 2002-05-10 | 2002-05-10 | Current detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003333855A true JP2003333855A (en) | 2003-11-21 |
Family
ID=29697330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002134846A Pending JP2003333855A (en) | 2002-05-10 | 2002-05-10 | Current detection circuit |
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| Country | Link |
|---|---|
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010093881A (en) * | 2008-10-06 | 2010-04-22 | Shindengen Electric Mfg Co Ltd | Converter with improved three-phase power factor |
| JP2011101571A (en) * | 2009-11-06 | 2011-05-19 | Ohira Electronics Co Ltd | Ac-dc converter |
| JP2011102737A (en) * | 2009-11-10 | 2011-05-26 | Shindengen Electric Mfg Co Ltd | Current detection circuit |
| JP2011147202A (en) * | 2010-01-12 | 2011-07-28 | Tdk-Lambda Corp | Switching power unit |
| JP2012085389A (en) * | 2010-10-07 | 2012-04-26 | Mitsubishi Electric Corp | Dc power supply device |
| CN103376346A (en) * | 2012-04-26 | 2013-10-30 | 比亚迪股份有限公司 | Low-side current detecting system |
| JP2014166050A (en) * | 2013-02-26 | 2014-09-08 | Origin Electric Co Ltd | Ac-dc power conversion device |
-
2002
- 2002-05-10 JP JP2002134846A patent/JP2003333855A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010093881A (en) * | 2008-10-06 | 2010-04-22 | Shindengen Electric Mfg Co Ltd | Converter with improved three-phase power factor |
| JP2011101571A (en) * | 2009-11-06 | 2011-05-19 | Ohira Electronics Co Ltd | Ac-dc converter |
| JP2011102737A (en) * | 2009-11-10 | 2011-05-26 | Shindengen Electric Mfg Co Ltd | Current detection circuit |
| JP2011147202A (en) * | 2010-01-12 | 2011-07-28 | Tdk-Lambda Corp | Switching power unit |
| JP2012085389A (en) * | 2010-10-07 | 2012-04-26 | Mitsubishi Electric Corp | Dc power supply device |
| CN103376346A (en) * | 2012-04-26 | 2013-10-30 | 比亚迪股份有限公司 | Low-side current detecting system |
| JP2014166050A (en) * | 2013-02-26 | 2014-09-08 | Origin Electric Co Ltd | Ac-dc power conversion device |
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