WO2015136592A1 - 電流検出器及び電力変換装置 - Google Patents
電流検出器及び電力変換装置 Download PDFInfo
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- WO2015136592A1 WO2015136592A1 PCT/JP2014/056108 JP2014056108W WO2015136592A1 WO 2015136592 A1 WO2015136592 A1 WO 2015136592A1 JP 2014056108 W JP2014056108 W JP 2014056108W WO 2015136592 A1 WO2015136592 A1 WO 2015136592A1
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- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- 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
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
- G01R15/185—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core with compensation or feedback windings or interacting coils, e.g. 0-flux sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/32—Compensating for temperature change
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- 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
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
Definitions
- the present invention relates to a current detector that detects a current flowing through an inductor, and a power conversion device that performs on / off control of a semiconductor switching element using a current detection value of the current detector to perform power conversion.
- FIG. 5 shows a general step-down chopper provided with the current detection function of the main circuit.
- semiconductor switching elements 12 such as MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) and diodes 13 are connected in series in opposite directions to each other at both ends of the DC power supply 11.
- the inductor 14, the current detection unit 15, and the smoothing capacitor 16 are connected in series to both ends of the diode 13, and the load 17 is connected to both ends of the smoothing capacitor 16.
- Reference numeral 12 d denotes a parasitic diode.
- the semiconductor switching element 12 is turned on to store energy in the inductor 14. In addition, the semiconductor switching element 12 is turned off to release the stored energy of the inductor 14 and the energy is supplied to the smoothing capacitor 16 through the diode 13 to realize the step-down operation.
- the control circuit 30 turns on the semiconductor switching element 12 using the detection value of the current (main circuit current) I L output from the current detection unit 15 and the detection value of the output voltage V out obtained from the smoothing capacitor 16. ⁇ Feedback control is performed so as to turn off and make the output voltage Vout equal to the command value.
- the current detection unit 15 is, for example, a circuit using a shunt resistor or a hole CT (Current-Transformer), and these components convert the current IL into a voltage value.
- FIG. 6 is a circuit diagram in the case where the prior art described in Patent Document 1 is applied to the current detection unit 15 in FIG. 5, 141 is a main winding of the inductor 14, 142 is an auxiliary winding, and 20 is a voltage detection unit. is there.
- the main winding 141 and the auxiliary winding 142 are wound in the same direction, and the number of turns is also equal. Note that a and b are one end and the other end of the main winding 141, and a ′ and b ′ are one end and the other end of the auxiliary winding 142.
- the main winding 141 is connected in series to the main circuit (between the output side of the semiconductor switching element 12 in FIG. 5 and one end of the smoothing capacitor 16). Further, one end a ′ of the auxiliary winding 142 is connected to the main circuit, and the other end b ′ is connected to the voltage detection unit 20 together with the other end b of the main winding 141. 6, if the input impedance of the voltage detection unit 20 is sufficiently large, the current I L because not flow in the auxiliary winding 142 flows to the main winding 141, the voltage drop due to the winding resistance R of the main winding 141 (R ⁇ I L ) occurs only in the main winding 141.
- an alternating voltage of a magnitude of (L ⁇ dI L / dt) is generated at both ends of the main winding 141.
- L is an inductance of the main winding 141.
- the main winding 141 and the auxiliary winding 142 have the same relationship as the primary winding and the secondary winding of the transformer having a turns ratio of 1: 1, both ends of the auxiliary winding 142 electromotive force of the alternating voltage (L ⁇ dI L / dt) equal magnitude generated across occurs with the same polarity.
- JP-A-3-178555 page 3, upper right column, line 17 to lower right column, line 20, FIG. 1, etc.
- the resistance value of the winding of the inductor depends on the temperature of the winding material (copper), the winding temperature becomes high as in the case of supplying power to a heavy load. Winding resistance also increases. For example, when the temperature rises by 80 [K], the winding resistance R becomes 1.3 times as large, so in the prior art of Patent Document 1 on the premise that the winding resistance R has a fixed value, the current detection The error of the value is extremely large and not practical.
- the problem to be solved by the present invention is to use a current detector that can accurately detect the magnitude of the main circuit current flowing in the inductor without being affected by the temperature of the winding of the inductor, and the current detector.
- An object of the present invention is to provide a power converter.
- the present invention is a current detector for detecting a main circuit current flowing through an inductor by switching operation of a semiconductor switching element, wherein the inductor includes a main winding and an auxiliary winding having the same number of turns,
- the present invention also relates to a current detector connected so as to cancel an electromotive force generated in a main winding and an auxiliary winding by a switching operation, and a power conversion device using the current detector.
- the other ends of the main winding and the auxiliary winding whose one end is connected to the main circuit line are respectively connected to the input terminal, and the other end of the main winding and the auxiliary A voltage detection unit is provided that detects only the voltage between the other end of the winding. Furthermore, the current detector corrects the winding resistance of the main winding based on the temperature detection unit that detects the temperature of the main winding and the detected temperature, and corrects the voltage by the winding resistance and the voltage detection unit. And a current calculation unit that calculates a main circuit current flowing through the main winding using the detection value.
- the current calculation unit calculates the main circuit current using a voltage detection value sampled in synchronization with the switching operation of the semiconductor switching element.
- a plurality of strands of wire are connected in parallel to form a main winding, and the number of strands of the auxiliary winding is less than or equal to the number of parallel connections of the main winding. is there.
- the diameter of the wire of the auxiliary winding can be smaller than the diameter of the wire of the main winding.
- the current detector according to claim 5 is one in which the auxiliary winding is substituted by a secondary winding of a transformer. That is, the present invention includes a transformer having a primary winding connected in parallel to an inductor connected in series to a main circuit line, and a secondary winding having the same turns ratio as the primary winding. In addition, the other end of each of the inductor and the secondary winding whose one end is connected to the main circuit line is connected to the input terminal, and the electromotive force generated in the inductor and the secondary winding due to the switching operation is canceled and the inductor And a voltage detection unit that detects only the voltage between the other end of the secondary winding and the other end of the secondary winding.
- the temperature detection unit that detects the temperature of the inductor, the winding resistance of the inductor is corrected based on the detected temperature, and the corrected coil current flows in the inductor using the voltage detection value by the voltage detection unit And a current calculation unit that calculates a main circuit current.
- the power converter described in claim 6 controls DC power by controlling the switching operation of the semiconductor switching element using the current detection value by the current detector according to any one of claims 1 to 5. Or it converts AC power.
- FIG. 1A It is a block diagram which shows 1st Embodiment of this invention. It is a circuit diagram of FIG. 1A.
- FIG. It is a circuit diagram showing a modification of a 1st embodiment of the present invention. It is a circuit diagram showing a 2nd embodiment of the present invention. It is a circuit diagram of a common step-down chopper. It is a circuit diagram of the prior art described in patent document 1.
- FIG. 1A It is a circuit diagram showing a modification of a 1st embodiment of the present invention. It is a circuit diagram showing a 2nd embodiment of the present invention. It is a circuit diagram of a common step-down chopper. It is a circuit diagram of the prior art described in patent document 1.
- FIG. 1A It is a circuit diagram showing a modification of a 1st embodiment of the present invention. It is a circuit diagram showing a 2nd embodiment of the present invention. It is a circuit diagram of a common step-down chopper. It is a circuit
- FIG. 1A is a block diagram of a current detector according to a first embodiment of the present invention
- FIG. 1B is a circuit diagram thereof.
- This current detector is connected, for example, between the output terminal of the semiconductor switching element 12 and one end of the smoothing capacitor 16 as shown in FIG. 5, and the current (main circuit current) I L flowing through the inductor And switches the semiconductor switching element 12 by the control circuit 30, and is used to control the output voltage Vout according to the command value.
- the main winding 1 and the auxiliary winding 2 having the same number of turns are wound around the iron core 4 of the inductor 3 in the same direction.
- One end 1a, 2a of the winding start of the main winding 1 and the auxiliary winding 2 is connected to the main circuit line 50, and the main circuit line 50 is connected to the output side of the power converter as shown in FIG. There is.
- the other ends 1b and 2b of the winding ends of the main winding 1 and the auxiliary winding 2 are respectively connected to the input side of a voltage detection unit 5 which detects and amplifies the voltage between the other ends 1b and 2b. .
- Reference numeral 7 denotes a temperature detection element such as a thermistor for detecting the temperature of the main winding 1, and the output thereof is input to the current calculation circuit 6 composed of a microcomputer and the like together with the output of the voltage detection unit 5.
- the current operation circuit 6 has a function of correcting the winding resistance of the main winding 1 according to the temperature of the main winding 1 detected by the temperature detection element 7 as a first function, and has a second function It has a function to correct the voltage detection value by the voltage detection unit 5 using the corrected winding resistance. In the second function, it is also possible to correct an error due to an imbalance in the amount of increase or decrease in the voltage detection value V generated due to the leakage inductance of the main winding 1 during switching operation. .
- FIG. 2 is a schematic waveform diagram of the current IL and the voltage detection value V in the present embodiment, and the areas S 1 and S 2 of the hatched portion in the waveform of the voltage detection value V Since it depends on the ratio to the leakage inductance, the conduction ratio (on duty) of the semiconductor switching element, and the voltage across the reactor 3, it can be estimated by calculation by the current calculation circuit 6.
- the conduction ratio of the semiconductor switching element and the voltage across the reactor 3 can obtain information from the control circuit, the inductance component of the main winding 1 has individual variation with respect to the design value, There is a risk that high-precision values can not be obtained. Therefore, in this embodiment, the waveform of the voltage detection value V is observed while sampling at a frequency twice the switching frequency, and the fact that the areas S 1 and S 2 are equal to the observed waveform is used. The average value V average is calculated while taking into account the conduction ratio of the semiconductor switching element. As a result, the average value V average can be determined without error without being influenced by the leakage inductance of the main winding 1.
- t s indicates sampling timing, and this timing corresponds to the middle point of the on period ⁇ t on and the off period ⁇ t off of the semiconductor switching element.
- the control circuit microcomputer
- software may be simply added. For example, a dedicated circuit for taking in the conduction ratio may be separately added. There is no need to provide it.
- a low pass filter may be connected to the output side of the voltage detection unit 5 to remove the influence of the leakage inductance of the main winding 1 .
- the main circuit current does not flow to the auxiliary winding 2 if the input impedance of the voltage detection unit 5 is large. Therefore, if a wire with a diameter smaller than that of the main winding 1 is used for the auxiliary winding 2, cost is reduced. The increase can be suppressed.
- the inductor for large current a plurality of main windings are often connected in parallel in many cases.
- a one-turn type inductor 3A shown in FIG. 3 as a modification one of the plurality of strands of the main winding 1A connected in parallel to one another is used as the auxiliary winding 2 and the other end is It may be connected to the voltage detection unit 5.
- the auxiliary winding 2 may be configured by connecting a plurality of strands in parallel, and in any case, the parallel number of strands of the main winding 1A N> the parallel number of strands of the auxiliary winding 2 It should be in the relationship of M.
- FIG. 4 is a circuit diagram showing a second embodiment of the present invention.
- the same components as in FIGS. 1A, 1B and 3 are denoted by the same reference numerals, and in the following, differences will be mainly described.
- the remodeled inductors 3 and 3A are used, but in the second embodiment, it is not necessary to remodel the inductor itself.
- the inductor connected in series to the main circuit line 50 is configured of only the main winding 1.
- Reference numeral 8 is a transformer having a 1: 1 turns ratio, and its primary winding 8A is connected in parallel to the main winding 1. Furthermore, one end of the secondary winding 8B is connected to one end of the main winding 1, and the other end of the secondary winding 8B is connected to one input terminal of the voltage detection unit 5. The other end of the main winding 1 is connected to the other input terminal of the voltage detection unit 5 as in the first embodiment.
- the secondary winding 8B of the transformer 8 connected in parallel to the inductor as the auxiliary winding, the same function and effect as those of the first embodiment can be obtained without remodeling the inductor itself. be able to.
- the present invention performs a step-up chopper, a step-down chopper, an inverter, and a converter for converting DC power or AC power by performing on / off control of a semiconductor switching element using a current detection value obtained by a current detector according to each embodiment.
- Etc. can be used for various power conversion devices.
- the phase type (single phase, multiphase) of these power converters is not particularly limited.
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Description
図5は、主回路の電流検出機能を備えた一般的な降圧チョッパを示している。図5において、直流電源11の両端には、MOSFET(Metal-Oxide-Semiconductor Field-Effect Transistor)等の半導体スイッチング素子12とダイオード13とが互いに逆方向に直列接続されている。また、ダイオード13の両端には、インダクタ14と電流検出部15と平滑コンデンサ16とが直列に接続され、平滑コンデンサ16の両端には負荷17が接続されている。なお、12dは寄生ダイオードを示す。
制御回路30では、電流検出部15から出力される電流(主回路電流)ILの検出値と、平滑コンデンサ16から得た出力電圧Voutの検出値と、を用いて半導体スイッチング素子12をオン・オフし、出力電圧Voutを指令値に一致させるようなフィードバック制御を行っている。
電流検出部15としては、例えばシャント抵抗やホールCT(Current-Transformer)を用いた回路があり、これらの部品によって電流ILを電圧値に換算している。
図6は、図5における電流検出部15に特許文献1記載の従来技術を適用した場合の回路図であり、141はインダクタ14の主巻線、142は補助巻線、20は電圧検出部である。主巻線141と補助巻線142とは同一方向に巻かれ、巻数も等しくなっている。なお、a,bは主巻線141の一端及び他端、a’,b’は補助巻線142の一端及び他端である。
図6において、電圧検出部20の入力インピーダンスが十分に大きければ、電流ILは主巻線141に流れて補助巻線142には流れないため、主巻線141の巻線抵抗Rによる電圧降下(R・IL)が主巻線141のみに生じる。
ここで、主巻線141及び補助巻線142は巻数比1:1のトランスの一次巻線及び二次巻線と同じ関係であるため、補助巻線142の両端には、主巻線141の両端に発生する交番電圧(L・dIL/dt)と等しい大きさの起電力が同じ極性で発生する。
従って、各一端a,a’ が同電位である主巻線141及び補助巻線142の他端b,b’の間の電圧は、主巻線141に流れる電流ILによる電圧降下(R・IL)のみとなり、この電圧が電圧検出部20により検出される。よって、主巻線141の巻線抵抗Rを予め測定しておけば、制御回路は、電圧検出部20による電圧検出値V(=R・IL)の関係から電流ILを求めることができる。
そして、請求項1に係る電流検出器は、各一端が主回路線路に接続された主巻線及び補助巻線の各他端が、入力端子にそれぞれ接続され、主巻線の他端と補助巻線の他端との間の電圧のみを検出する電圧検出部を備えている。
更に、この電流検出器は、主巻線の温度を検出する温度検出部と、その検出温度に基づいて主巻線の巻線抵抗を補正し、補正後の巻線抵抗と電圧検出部による電圧検出値とを用いて、主巻線に流れる主回路電流を演算する電流演算部と、を備えたものである。
また、請求項3に係る電流検出器は、複数の素線を並列接続して主巻線を構成し、補助巻線の素線の数を、主巻線の並列接続数以下にしたものである。
更に、請求項4に記載するように、補助巻線の素線の径は主巻線の素線の径よりも細くすることが可能である。
すなわち、この発明は、主回路線路に直列接続されたインダクタに並列接続される一次巻線、及び、この一次巻線と巻数比が同一である二次巻線を備えたトランスを備えている。また、各一端が主回路線路に接続されたインダクタ及び二次巻線の各他端が、入力端子にそれぞれ接続され、スイッチング動作によりインダクタ及び二次巻線に発生する起電力が打ち消されてインダクタの他端と二次巻線の他端との間の電圧のみを検出する電圧検出部を備えている。
更に、インダクタの温度を検出する温度検出部と、その検出温度に基づいてインダクタの巻線抵抗を補正し、補正後の巻線抵抗と電圧検出部による電圧検出値とを用いて、インダクタに流れる主回路電流を演算する電流演算部と、を備えたものである。
まず、図1Aは本発明の第1実施形態に係る電流検出器の構成図であり、図1Bはその回路図である。この電流検出器は、例えば、図5に示したように半導体スイッチング素子12の出力端子と平滑コンデンサ16の一端との間に接続されるものであり、インダクタに流れる電流(主回路電流)ILを検出して制御回路30により半導体スイッチング素子12をスイッチングし、出力電圧Voutを指令値通りに制御するために使用される。
この電流演算回路6は、第1の機能として、温度検出素子7により検出した主巻線1の温度に応じて主巻線1の巻線抵抗を補正する機能を備え、第2の機能として、補正後の巻線抵抗を用いて電圧検出部5による電圧検出値を補正する機能を備えている。なお、第2の機能においては、スイッチング動作時に主巻線1の漏れインダクタンスに起因して発生する電圧検出値Vの増加分、減少分の不均衡による誤差を補正することも可能になっている。
半導体スイッチング素子のスイッチング動作により電流ILが流れると、図6と同様の原理によって主巻線1及び補助巻線2に発生する起電力(L・dIL/dt)が打ち消され、主巻線1の巻線抵抗Rのみに依存する電圧Vが電圧検出部5により検出されて電流演算回路6に入力される。これと同時に、主巻線1の温度が温度検出素子7により検出されて電流演算回路6に入力される。
図2は本実施形態における電流IL及び電圧検出値Vの模式的な波形図であり、電圧検出値Vの波形におけるハッチング部分の面積S1,S2は、主巻線1の励磁インダクタンスと漏れインダクタンスとの比、半導体スイッチング素子の導通比(オンデューティ)、リアクトル3の両端電圧に依存するため、電流演算回路6による演算によって推定可能である。
そこで、この実施形態では、スイッチング周波数に対して2倍の周波数でサンプリングしつつ電圧検出値Vの波形を観測し、その観察波形に対して、面積S1,S2が等しくなることを利用して、半導体スイッチング素子の導通比を考慮しながら平均値Vaverageを演算する。これにより、主巻線1の漏れインダクタンスに影響されずに平均値Vaverageを誤差なく求めることができる。
図2におけるtsはサンプリングタイミングを示しており、このタイミングは、半導体スイッチング素子のオン期間Δton、オフ期間Δtoffのそれぞれ中点に相当する。
なお、半導体スイッチング素子を所定の導通比に従って制御する制御回路(マイコン)に電流演算回路6の機能を持たせる場合には、単にソフトウェアを追加すれば良く、例えば導通比を取り込む専用の回路を別途設ける必要はない。
なお、電流検出値を電力変換装置の低速制御や電流モニタリングのみに用いる場合には、ローパスフィルタを電圧検出部5の出力側に接続して主巻線1の漏れインダクタンスによる影響を除去すれば良い。
第1実施形態では改造したインダクタ3,3Aを用いているが、第2実施形態はインダクタ自体の改造を不要としている。
この実施形態によれば、インダクタに並列接続されたトランス8の二次巻線8Bを補助巻線として利用することにより、インダクタ自体を改造しなくても第1実施形態と同様の作用効果を得ることができる。
1a,2a:一端
1b,2b:他端
2:補助巻線
3,3A:インダクタ
4:鉄芯
5:電圧検出部
6:電流演算回路
7:温度検出素子
8:トランス
8A:一次巻線
8B:二次巻線
50:主回路線路
Claims (6)
- 半導体スイッチング素子のスイッチング動作によりインダクタを流れる主回路電流を検出する電流検出器であって、前記インダクタは、巻数が等しい主巻線及び補助巻線を備え、かつ、前記スイッチング動作により前記主巻線及び補助巻線に発生する起電力が打ち消されるように接続されている電流検出器において、
各一端が主回路線路に接続された前記主巻線及び補助巻線の各他端が、入力端子にそれぞれ接続され、前記主巻線の他端と前記補助巻線の他端との間の電圧のみを検出する電圧検出部と、
前記主巻線の温度を検出する温度検出部と、
前記温度検出部による検出温度に基づいて前記主巻線の巻線抵抗を補正し、補正後の巻線抵抗と前記電圧検出部による電圧検出値とを用いて、前記主巻線に流れる主回路電流を演算する電流演算部と、
を備えたことを特徴とする電流検出器。 - 請求項1に記載した電流検出器において、
前記電流演算部は、前記スイッチング動作に同期してサンプリングされた前記電圧検出値を用いて前記主回路電流を演算することを特徴とする電流検出器。 - 請求項1または2に記載した電流検出器において、
複数の素線を並列接続して前記主巻線を構成し、前記補助巻線の素線の数を、前記主巻線の並列接続数以下にしたことを特徴とする電流検出器。 - 請求項1~3の何れか1項に記載した電流検出器において、
前記補助巻線の素線の径を前記主巻線の素線の径よりも細くしたことを特徴とする電流検出器。 - 半導体スイッチング素子のスイッチング動作によりインダクタを流れる主回路電流を検出する電流検出器において、
主回路線路に直列接続された前記インダクタに並列接続される一次巻線、及び、前記一次巻線と巻数比が同一である二次巻線を備えたトランスと、
各一端が前記主回路線路に接続された前記インダクタ及び前記二次巻線の各他端が入力端子にそれぞれ接続され、前記スイッチング動作により前記インダクタ及び前記二次巻線に発生する起電力が打ち消されて前記インダクタの他端と前記二次巻線の他端との間の電圧のみを検出する電圧検出部と、
前記インダクタの温度を検出する温度検出部と、
前記温度検出部による検出温度に基づいて前記インダクタの巻線抵抗を補正し、補正後の巻線抵抗と前記電圧検出部による電圧検出値とを用いて、前記インダクタに流れる主回路電流を演算する電流演算部と、
を備えたことを特徴とする電流検出器。 - 請求項1~5の何れか1項に記載した電流検出器による電流検出値を用いて前記半導体スイッチング素子のスイッチング動作を制御することにより、直流電力または交流電力を変換することを特徴とする電力変換装置。
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| CN201480049504.0A CN105531594A (zh) | 2014-03-10 | 2014-03-10 | 电流检测器和电力变换装置 |
| JP2016507139A JPWO2015136592A1 (ja) | 2014-03-10 | 2014-03-10 | 電流検出器及び電力変換装置 |
| PCT/JP2014/056108 WO2015136592A1 (ja) | 2014-03-10 | 2014-03-10 | 電流検出器及び電力変換装置 |
| US15/067,320 US20160197545A1 (en) | 2014-03-10 | 2016-03-11 | Current detector and power conversion device |
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| CN110392974A (zh) * | 2017-03-17 | 2019-10-29 | 三菱电机株式会社 | 温度推测装置以及电气装置 |
| CN110431427A (zh) * | 2017-03-17 | 2019-11-08 | 三洋电机株式会社 | 电流检测器 |
| CN107132404B (zh) * | 2017-05-15 | 2019-11-05 | 矽力杰半导体技术(杭州)有限公司 | 检测方法、检测电路、控制器及开关电源 |
| JP6844589B2 (ja) * | 2018-06-27 | 2021-03-17 | 株式会社デンソー | 電流検出装置 |
| JP6826560B2 (ja) * | 2018-07-05 | 2021-02-03 | 横河電機株式会社 | 電流センサ |
| CN109193959B (zh) * | 2018-09-21 | 2024-09-17 | 全球能源互联网研究院有限公司 | 取能用电流互感器及使用其取能的静止同步串联补偿装置 |
| WO2020263289A1 (en) * | 2019-06-24 | 2020-12-30 | General Electric Company | Circuit and method for bus voltage variation in power converters |
| CN110768510B (zh) | 2019-09-30 | 2022-09-20 | 上海矽力杰微电子技术有限公司 | 控制电路和方法以及功率变换器 |
| CN115480201A (zh) * | 2021-06-16 | 2022-12-16 | 南京南瑞继保电气有限公司 | 一种高频磁性元件绕组交流电阻测量校正方法 |
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