WO2010061652A1 - Pfcコンバータ - Google Patents
Pfcコンバータ Download PDFInfo
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- WO2010061652A1 WO2010061652A1 PCT/JP2009/059749 JP2009059749W WO2010061652A1 WO 2010061652 A1 WO2010061652 A1 WO 2010061652A1 JP 2009059749 W JP2009059749 W JP 2009059749W WO 2010061652 A1 WO2010061652 A1 WO 2010061652A1
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- pfc converter
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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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
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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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- 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
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- the present invention relates to an AC-DC converter that inputs an AC power supply and outputs a DC voltage, and more particularly to a PFC converter that improves the power factor.
- a general switching power supply device that uses a commercial AC power supply as an input power supply rectifies and smoothes the commercial AC power supply and converts it to a DC voltage, which is then switched by a DC-DC converter. Is greatly distorted. This is the cause of the harmonic current.
- a PFC converter is provided after the full-wave rectifier circuit and before the smoothing circuit by the smoothing capacitor.
- This PFC converter is composed of a chopper circuit, and operates so that the input current waveform is similar to the input voltage waveform, that is, in the form of a sine wave having the same phase. Therefore, the harmonic current is suppressed to a certain level or less.
- a configuration example of the PFC converter disclosed in Patent Document 1 will be described with reference to FIG.
- a series circuit of an inductor L1, a switching element Q1 that is a MOSFET, and a current detection resistor R is provided at both ends of the diode bridge B1 that rectifies the AC power supply voltage of the AC input power supply Vac. It is connected.
- a series circuit of a diode D1 and a smoothing capacitor C1 is connected to both ends of the switching element Q1, and a load RL is connected to both ends of the smoothing capacitor C1.
- the switching element Q1 is turned on / off by PWM control of the control circuit 10.
- the current detection resistor R detects an input current flowing through the diode bridge B1.
- the control circuit 10 includes an error amplifier 111, a multiplier 112, an error amplifier 113, a voltage controlled oscillator (VCO) 115, and a PWM comparator 116.
- VCO voltage controlled oscillator
- the error amplifier 111 obtains an error between the voltage of the smoothing capacitor C1 and the reference voltage E1.
- the multiplier 112 multiplies the error voltage signal and the rectified voltage by the diode bridge B1.
- the error amplifier 113 generates an error between the multiplication result of the multiplier 112 and the current signal flowing through the diode bridge B1 and outputs the error to the PWM comparator 116.
- the VCO 115 generates a triangular wave signal having a frequency corresponding to the voltage value after rectification of the AC power supply voltage.
- the PWM comparator 116 the triangular wave signal from the VCO 115 is input to the-terminal, and the signal from the error amplifier 113 is input to the + terminal. That is, the PWM comparator 116 applies a duty pulse corresponding to the current flowing through the diode bridge B1 and the output voltage to the switching element Q1.
- the duty pulse is a pulse width control signal that continuously compensates for fluctuations in the AC power supply voltage and the DC load voltage at a constant period.
- the AC power supply current waveform is controlled to be similar to and in phase with the AC power supply voltage waveform, and the harmonics and the power factor are improved.
- Patent Document 2 is disclosed as a digitally controlled PFC converter. Also in the case of digital control, the current flowing through the inductor is detected, and the switching element is switched by PWM control according to the current value.
- JP 2004-282958 A Japanese Patent Laid-Open No. 7-177746
- An object of the present invention is to provide a PFC converter capable of detecting current flowing through an inductor at high speed and with high accuracy so that proper harmonics and power factor can be improved and an accurate operation state can be detected. It is in.
- a rectifying circuit for rectifying an AC voltage input from an AC input power supply, a series circuit including an inductor and a switching element connected to the next stage of the rectifying circuit, and a rectifying / smoothing connected in parallel to the switching element
- a PFC converter comprising: a circuit; and switching control means for controlling on / off of the switching element so that an input current input from the AC input power source is similar to the AC voltage,
- a current detection circuit for detecting a current flowing through the switching element or the inductor during an on period of the switching element;
- First current detection means for sampling a detection signal of a current flowing through the switching element or the inductor at the center of the ON period of the switching element and detecting it as a first current value;
- Second current detection means for sampling a detection signal of a current flowing through the inductor at the center of the off period of the switching element and detecting it as a second current value;
- the first current value is an average value of currents flowing through the switching element and the inductor during the ON period of the switching element.
- the second current value is an average value of the current flowing through the inductor during the OFF period of the switching element. Therefore, the increase / decrease state of the current flowing through the inductor can be detected substantially by this two-point sampling, and control corresponding to the increase / decrease state can be performed at high speed.
- the current increase / decrease state detection means considers the current continuous mode when the first current value and the second current value are equal, and when the second current value is smaller than the first current value. Considered as a discontinuous current mode.
- the current increase / decrease state detection unit determines a steady state and a transient state based on a change between the first current values or a change between the second current values at different periods.
- the steady state and the transient state can be determined at a high speed with a very small amount of calculation processing, and the control according to the state can be performed at a high speed.
- an increase / decrease state of the current flowing through the inductor can be detected based on the first current value and the second current value, and control corresponding to the increase / decrease state can be performed at high speed.
- the current continuous mode and the current discontinuous mode can be performed with a very small amount of calculation processing. Can be determined at high speed, and control according to the mode can be performed at high speed.
- the determination between the steady state and the transient state can be performed at a high speed with a very small amount of calculation processing. It is possible to perform control according to the mode at high speed.
- FIG. 1 is a circuit diagram of a PFC converter according to an embodiment of the present invention.
- FIG. 3 is a diagram showing various control methods of the PFC converter 101 by the digital signal processing circuit 13.
- FIG. It is a wave form diagram of the voltage and current of the PFC converter 101 in the unit of a switching cycle in the state in which control is performed in the current continuous mode. It is a figure which shows about the method of calculating
- 6A is a waveform diagram of the inductor current in the continuous current mode, and FIG.
- FIG. 6B is a waveform diagram of the inductor current in the current discontinuous mode.
- FIG. 7A is a waveform diagram of the inductor current in the continuous current mode and in the steady state
- FIG. 7B is a waveform diagram of the inductor current in the current continuous mode and in the transient state.
- 8A is a waveform diagram of the inductor current in the current discontinuous mode and in the steady state
- FIG. 8B is a waveform diagram of the inductor current in the current continuous mode and in the transient state.
- FIG. 2 is a circuit diagram of the PFC converter 101 according to the embodiment of the present invention.
- reference signs P ⁇ b> 11 and P ⁇ b> 12 are input ports of the PFC converter 101
- reference signs P ⁇ b> 21 and P ⁇ b> 22 are output ports of the PFC converter 101.
- An AC input power supply Vac which is a commercial AC power supply, is input to the input ports P11 to P12, and a load circuit 20 is connected to the output ports P21 to P22.
- the load circuit 20 is, for example, a DC-DC converter and a circuit of an electronic device that is supplied with power by the DC-DC converter.
- a diode bridge B1 which is a rectifier circuit for full-wave rectifying the AC voltage of the AC input power supply Vac is provided.
- a series circuit of an inductor L1, a switching element Q1, and a current detecting resistor R1 is connected to the output side of the diode bridge B1.
- a rectifying / smoothing circuit including a diode D1 and a smoothing capacitor C1 is connected in parallel to both ends of the switching element Q1.
- the inductor L1, the switching element Q1, the diode D1, and the smoothing capacitor C1 constitute a so-called boost chopper circuit.
- An input voltage detection circuit 11 is provided between both ends on the output side of the diode bridge B1.
- An output voltage detection circuit 12 is provided between the output ports P21 and P22.
- the digital signal processing circuit 13 is constituted by a DSP, and controls the PFC converter 101 by digital signal processing. That is, the digital signal processing circuit 13 receives the output signal of the input voltage detection circuit 11 and detects the phase of the voltage of the AC input power supply by a method described later. Further, the output signal of the output voltage detection circuit 12 is inputted to detect the output voltage. Further, the switching element Q1 is turned on / off at a predetermined switching frequency.
- the processing unit related to the switching control signal for the switching element Q1 of the digital signal processing circuit 13 corresponds to the “switching control means” according to the present invention.
- the current detection resistor R1 corresponds to a “current detection circuit” according to the present invention.
- the processing section related to current detection of the digital signal processing circuit 13 corresponds to the “first current detection means” and the “second current detection means” according to the present invention.
- the digital signal processing circuit 13 is provided with a port for communicating with the load circuit 20, and for example, performs data communication or signal input / output, and indicates the state of the converter with respect to the load circuit (electronic device). Always transmit, transmit input voltage, output voltage, output current, etc., or receive the load status from the load circuit side and reflect it in switching control.
- FIG. 3 is a diagram showing various control methods of the PFC converter 101 by the digital signal processing circuit 13.
- 3A, 3B, and 3C are current waveforms in one cycle of the AC input power supply.
- the waveform IL is a waveform of a current flowing through the inductor L1 in the PFC converter 101 shown in FIG. Ip is an envelope of the peak value (peak current), and Ia is an envelope of the average value (average current).
- FIG. 3A is a waveform diagram in the current continuous mode
- FIG. 3B is a waveform diagram in the current discontinuous mode
- FIG. 3C is a waveform diagram in the current critical mode.
- the current flowing through the inductor L1 of the PFC converter 101 does not become zero except near the zero cross of the AC input power supply.
- a period in which the current value becomes 0 occurs every time the excitation energy is accumulated / released in the inductor L1 of the PFC converter 101.
- the critical mode shown in FIG. 3C the current value becomes 0 each time the excitation energy is accumulated / released in the inductor L1, and the state of the current value 0 does not continue.
- FIG. 4 is a voltage / current waveform diagram of the PFC converter 101 in units of switching periods in a state where control is performed in the continuous current mode.
- the digital signal processing circuit 13 performs switching control so that the input current to the PFC converter 101, that is, the average value of the current flowing through the inductor L1, is similar to the full-wave rectified waveform. In this way, when an input current similar to the input voltage flows, harmonics are suppressed and the power factor is improved.
- FIG. 4A shows a current waveform of the average value Ii of the current flowing through the inductor L1 in a half cycle unit of the commercial power supply frequency
- FIG. 4B shows a switching cycle of a part of the time axis.
- a waveform diagram of the current IL flowing through the inductor L1 in units, (C) is a waveform diagram of the drain-source voltage Vds of the switching element Q1.
- the current IL flows through the inductor L1, and the current IL increases with a slope determined according to the voltage across the inductor L1 and the inductance of the inductor L1. Thereafter, the current IL decreases with an inclination determined by the voltage across the inductor L1 and its inductance during the OFF period Toff of the switching element Q1. As described above, the current IL flowing through the inductor L1 with the width of the current ripple ⁇ IL varies in the switching cycle.
- FIG. 5 is a diagram illustrating a method for obtaining an average value of the current flowing through the inductor L1 in order to perform the average current control in the current continuous mode.
- the current value (peak value) flowing through the inductor L1 at the turn-off timing of the switching element Q1 is represented by ILp
- the current value (minimum value) flowing through the inductor L1 at the turn-on timing of the switching element Q1 is represented by ILb
- the on period Ton of the switching element Q1 the on period Ton of the switching element Q1.
- the average value (average current) of the current flowing through the inductor L1 is expressed by the following relationship.
- the drop voltage of the resistor R1 at the center timing of the ON period Ton of the switching element Q1 is sampled.
- This sampling value is a value proportional to the average current value ILav of the current flowing through the inductor L1 during the ON period Ton of the switching element Q1.
- the voltage drop of the resistor R1 at the center timing of the off period Toff of the switching element Q1 is sampled.
- This sampling value is a value proportional to the average current value ILav of the current flowing through the inductor L1 during the OFF period Toff of the switching element Q1.
- the switching control signal given to the gate of the switching element Q1 is generated by the digital signal processing circuit 13, the central timing ts1 of the on period Ton and the central timing ts2 of the off period Toff are also digital signal processed.
- the circuit 13 knows (under control). Therefore, for example, the voltage drop of the current detection resistor R1 can be sampled at the above timing without inputting a timing signal from the outside.
- FIG. 6A is a waveform diagram of the inductor current in the continuous current mode
- FIG. 6B is a waveform diagram of the inductor current in the current discontinuous mode.
- the current critical mode is a special state of the continuous current mode, and the relationship between the first and second current values is the same as in the continuous current mode.
- “current continuous mode” includes “current critical mode”.
- FIG. 7A is a waveform diagram of the inductor current in the continuous current mode and steady state
- FIG. 7B is a waveform diagram of the inductor current in the continuous current mode and transient state.
- the average current flowing through the inductor L1 during the ON period Ton of the switching element Q1 and the inductor L1 flows during the OFF period Toff of the switching element Q1. It is equal to the average current.
- the first current value ILav1 is obtained a plurality of times, and the switching element Q1 is turned off in different periods.
- the second current value ILav2 is obtained by sampling at the central timing (ts21, ts22,%) Of the period Toff, and when the first current value and the second current value at a plurality of timings are equal, It is determined to be a continuous mode and a steady state.
- the average current flowing through the inductor L1 during the ON period Ton of the switching element Q1 increases by ⁇ IL1. Further, the average current flowing through the inductor L1 during the OFF period Toff of the switching element Q1 is increased by ⁇ IL2.
- the first current value is obtained a plurality of times by sampling at the central timing (ts11, ts12,%) Of the on-period Ton in different periods of the switching element Q1, and the first current values are obtained from each other. If it changes and it has changed, it will determine with it being in a transient state.
- the second current value is obtained a plurality of times by sampling at the central timing (ts21, ts22,%) Of the off period Toff in different periods of the switching element Q1, and the second current values are obtained from each other. If it changes and it has changed, it will determine with it being in a transient state.
- FIG. 8A is a waveform diagram of the inductor current in the current discontinuous mode and steady state
- FIG. 8B is a waveform diagram of the inductor current in the current continuous mode and transient state.
- the average current value ILav1 of the current flowing in the inductor L1 during the ON period Ton of the switching element Q1 and the inductor L1 flows during the OFF period Toff of the switching element Q1. It differs from the average current value ILav2 of the current.
- the average current value ILav1 of the current flowing through the inductor L1 during the ON period Ton of the switching element Q1 is constant in different switching cycles.
- the average current value ILav2 of the current flowing through the inductor L1 during the OFF period Toff of the switching element Q1 is constant.
- the first current value is obtained a plurality of times by sampling at the central timing (ts11, ts12,%) Of the ON period Ton in different periods of the switching element Q1, or the switching element Q1 is different.
- the second current value is obtained a plurality of times by sampling at the center timing (ts21, ts22,%) Of the off period Toff in the cycle, and the first current values or the second current values are compared, If it has not changed, it is determined that it is in a steady state.
- the switching element Q1 is turned off based on the average current flowing through the inductor L1 during the on period Ton of the switching element Q1.
- the average current flowing through the inductor L1 during the period Toff decreases.
- the change in the average current in one cycle appears in the same manner as in the case shown in FIG.
- the average currents of the currents flowing through the inductor L1 in the ON period Ton of the switching element Q1 are compared with each other in different switching periods, they change as indicated by ⁇ IL1. Even if the average currents of the currents flowing through the inductor L1 during the OFF period Toff of the switching element Q1 are compared, they are similarly changed as indicated by ⁇ IL2.
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Abstract
Description
図1に示す力率改善回路において、交流入力電源Vacの交流電源電圧を整流するダイオードブリッジB1の出力両端には、インダクタL1と、MOSFETであるスイッチング素子Q1と電流検出抵抗Rとの直列回路が接続されている。スイッチング素子Q1の両端には、ダイオードD1と平滑コンデンサC1との直列回路が接続され、平滑コンデンサC1の両端には、負荷RLが接続されている。スイッチング素子Q1は、制御回路10のPWM制御によりオン/オフするようになっている。電流検出抵抗Rは、ダイオードブリッジB1に流れる入力電流を検出する。
ディジタル制御の場合もインダクタに流れる電流を検出して、その電流値に応じたPWM制御によりスイッチング素子をスイッチングすることになる。
(1)交流入力電源から入力される交流電圧を整流する整流回路と、前記整流回路の次段に接続された、インダクタ及びスイッチング素子を含む直列回路と、前記スイッチング素子に並列接続された整流平滑回路と、前記交流入力電源から入力される入力電流が前記交流電圧に対して相似形となるように前記スイッチング素子をオン/オフ制御するスイッチング制御手段と、を備えたPFCコンバータであって、
前記スイッチング素子のオン期間に前記スイッチング素子または前記インダクタに流れる電流を検出する電流検出回路と、
前記スイッチング素子のオン期間の中央で、前記スイッチング素子または前記インダクタに流れる電流の検出信号をサンプリングして第1の電流値として検出する第1の電流検出手段と、
前記スイッチング素子のオフ期間の中央で、前記インダクタに流れる電流の検出信号をサンプリングして第2の電流値として検出する第2の電流検出手段と、
前記第1の電流値と前記第2の電流値とを比較して電流増減状態を検知する手段と、
を設けたことを特徴とする。
図2はこの発明の実施形態に係るPFCコンバータ101の回路図である。図2において符号P11,P12はPFCコンバータ101の入力ポート、符号P21,P22はPFCコンバータ101の出力ポートである。入力ポートP11-P12には商用交流電源である交流入力電源Vacが入力され、出力ポートP21-P22には負荷回路20が接続される。
ディジタル信号処理回路13は、PFCコンバータ101に対する入力電流、すなわちインダクタL1に流れる電流の平均値、が全波整流波形に相似形となるようにスイッチング制御を行う。このようにして入力電圧と相似形の入力電流が流れることにより、高調波が抑制され、力率が改善される。
スイッチング素子Q1のターンオフタイミングでインダクタL1に流れる電流値(ピーク値)をILp、スイッチング素子Q1のターンオンタイミングでインダクタL1に流れる電流値(最低値)をILbで表すと、スイッチング素子Q1のオン期間TonにインダクタL1に流れる電流の平均値(平均電流)は次の関係で表される。
一方、スイッチング素子Q1のオフ期間ToffにインダクタL1に流れる電流は直線的に減少するので、スイッチング素子Q1のオフ期間Toffの中央タイミングにおけるインダクタL1の電流値は上記平均電流値ILavに等しい。
図6(A)は電流連続モードでのインダクタ電流の波形図、図6(B)は電流不連続モードでのインダクタ電流の波形図である。
図7(A)は電流連続モードで且つ定常状態でのインダクタ電流の波形図、図7(B)は電流連続モードで且つ過渡状態でのインダクタ電流の波形図である。
定常状態では、図7(A)に示すように、どのスイッチング周期においても、スイッチング素子Q1のオン期間TonにインダクタL1に流れる電流の平均電流と、スイッチング素子Q1のオフ期間ToffにインダクタL1に流れる電流の平均電流とは等しい。従って、スイッチング素子Q1の異なった周期におけるオン期間Tonの中央タイミング(ts11,ts12,・・・)でサンプリングすることによって第1の電流値ILav1を複数回求め、スイッチング素子Q1の異なった周期におけるオフ期間Toffの中央タイミング(ts21,ts22,・・・)でサンプリングすることによって第2の電流値ILav2を求め、複数のタイミングでの第1の電流値と第2の電流値が等しいとき、電流不連続モードで且つ定常状態であると判定する。
図8(A)は電流不連続モードで且つ定常状態でのインダクタ電流の波形図、図8(B)は電流連続モードで且つ過渡状態でのインダクタ電流の波形図である。
電流不連続モードであれば、図8(A)に示すように、スイッチング素子Q1のオン期間TonにインダクタL1に流れる電流の平均電流値ILav1と、スイッチング素子Q1のオフ期間ToffにインダクタL1に流れる電流の平均電流値ILav2とは異なる。また、定常状態であれば、異なったスイッチング周期において、スイッチング素子Q1のオン期間TonにインダクタL1に流れる電流の平均電流値ILav1は一定である。同様に、異なったスイッチング周期において、スイッチング素子Q1のオフ期間ToffにインダクタL1に流れる電流の平均電流値ILav2は一定である。
11…入力電圧検出回路
12…出力電圧検出回路
13…ディジタル信号処理回路
20…負荷回路
B1…ダイオードブリッジ
C1…平滑コンデンサ
D1…ダイオード
Q1…スイッチング素子
R1…電流検出用抵抗
Toff…オフ期間
Ton…オン期間
ts1,ts2…中央タイミング
Vac…交流入力電源
Claims (3)
- 交流入力電源から入力される交流電圧を整流する整流回路と、前記整流回路の次段に接続された、インダクタ及びスイッチング素子を含む直列回路と、前記スイッチング素子に並列接続された整流平滑回路と、前記交流入力電源から入力される入力電流が前記交流電圧に対して相似形となるように前記スイッチング素子をオン/オフ制御するスイッチング制御手段と、を備えたPFCコンバータであって、
前記スイッチング素子のオン期間に前記スイッチング素子または前記インダクタに流れる電流を検出する電流検出回路と、
前記スイッチング素子のオン期間の中央で、前記スイッチング素子または前記インダクタに流れる電流の検出信号をサンプリングして第1の電流値として検出する第1の電流検出手段と、
前記スイッチング素子のオフ期間の中央で、前記インダクタに流れる電流の検出信号をサンプリングして第2の電流値として検出する第2の電流検出手段と、
前記第1の電流値と前記第2の電流値とを比較して電流増減状態を検知する電流増減状態検知手段と、
を設けたPFCコンバータ。 - 前記電流増減状態検知手段は、前記第1の電流値と前記第2の電流値とが等しいとき電流連続モードと見なし、前記第2の電流値が前記第1の電流値より小さいとき電流不連続モードと見なす、請求項1または2に記載のPFCコンバータ。
- 前記電流増減状態検知手段は、異なった周期での、前記第1の電流値同士の変化分または前記第2の電流値同士の変化分に基づいて定常状態と過渡状態の判定を行う、請求項1または2に記載のPFCコンバータ。
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CN2009801408890A CN102187560B (zh) | 2008-11-25 | 2009-05-28 | Pfc变换器 |
JP2010540402A JP5141774B2 (ja) | 2008-11-25 | 2009-05-28 | Pfcコンバータ |
US13/106,908 US8228696B2 (en) | 2008-11-25 | 2011-05-13 | Power factor correction converter |
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Also Published As
Publication number | Publication date |
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CN102187560A (zh) | 2011-09-14 |
JPWO2010061652A1 (ja) | 2012-04-26 |
US20110211377A1 (en) | 2011-09-01 |
JP5141774B2 (ja) | 2013-02-13 |
CN102187560B (zh) | 2013-12-11 |
US8228696B2 (en) | 2012-07-24 |
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