WO2019039047A1 - Power conversion device and method for controlling the same - Google Patents
Power conversion device and method for controlling the same Download PDFInfo
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- WO2019039047A1 WO2019039047A1 PCT/JP2018/022153 JP2018022153W WO2019039047A1 WO 2019039047 A1 WO2019039047 A1 WO 2019039047A1 JP 2018022153 W JP2018022153 W JP 2018022153W WO 2019039047 A1 WO2019039047 A1 WO 2019039047A1
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
Definitions
- the present invention relates to a power conversion device applied to a traveling system such as a hybrid vehicle and an electric vehicle and a control method thereof.
- patent documents 1 and 2 exist as a prior art example regarding this invention.
- the power conversion device can be discharged rapidly by the discharge resistor of the power conversion device including the switching element and the switching element being turned on during the discharge period of the power conversion device. .
- the resistance value of the discharge resistor is determined by the capacitance of the smoothing capacitor and the target discharge time, so if the power converter is to be rapidly discharged, the excessive power is discharged. There is a possibility that the inside of the discharge resistor may be disconnected due to the heat generation which is input to the resistor. Therefore, a relatively large discharge resistor that can withstand excessive power has been applied to the power conversion device.
- the present invention has been made in consideration of the above points, and will propose a power conversion device and its control method for preventing excessive power from being input to the discharge resistor even if the power conversion device is discharged rapidly. It is said that.
- a capacitor connected in parallel to an inverter circuit for converting DC power to AC power, and a switching element and a discharging resistor connected in parallel to the capacitor are connected in series.
- the control circuit includes a discharge circuit and a control circuit that controls the switching element to control discharging from the capacitor to the discharging resistor.
- the control circuit changes the ON / OFF duty ratio of the switching element when discharging from the capacitor. I let it go.
- control method of the power conversion device is such that discharge from the discharge circuit is performed by controlling the switching element connected to the discharge circuit of the power conversion device by the control circuit.
- the circuit changes the ON / OFF duty ratio of the switching element at the time of discharge.
- the present invention it is possible to realize a power conversion device and a control method thereof that prevent excessive power from being input to the discharge resistor even if the power conversion device is rapidly discharged.
- the power conversion device of the present invention is applied to a vehicle provided with a motor as a motive power source such as a hybrid car or an electric car.
- a vehicle 15 including the power converter 10 includes a battery 1, a contactor 2, an inverter circuit 3, a motor 4, a capacitor (smoothing capacitor 5), A discharge circuit 6 and a control circuit 7 of the discharge circuit 6 are provided.
- the battery 1 is a power source of the vehicle 15, and DC power from the battery 1 is converted into AC power by the inverter circuit 3, and the converted AC power drives the motor 4. Then, the motor 4 drives the vehicle 15.
- the inverter circuit 3 includes six IGBTs (Insulated Gate Bipolar Transistors) 31 and is configured of, for example, elements A to C including two IGBTs 31.
- the elements A to C correspond to the U phase, the B phase, and the W phase of the three-phase alternating current.
- the smoothing capacitor 5 is mounted to suppress voltage fluctuation generated when the inverter circuit 3 operates, and requires a relatively large capacitance.
- the contactor 2 is mounted for the purpose of separating the battery 1 and the power conversion device 10, and is turned on when the ignition switch is turned on and turned off when the ignition switch is turned off. The contactor 2 is also turned OFF when the vehicle detects an impact due to an abnormality of the power conversion device 10 or an accident.
- the discharge circuit 6 includes a discharge resistor 61 and a MOSFET 62, and is controlled by the control circuit 7 so as to quickly discharge the charge stored in the smoothing capacitor 5 when the contactor 2 is turned off.
- MOSFET 62 is mentioned here as an example of the switching element, the present invention is not limited to this.
- the relationship between the voltage Vc of the smoothing capacitor 5 and the elapsed time t can be expressed by the following equation.
- the elapsed time t is 2 seconds, which is a target time for discharging the voltage Vc of the smoothing capacitor 5 to 50 V or less after the contactor 2 is turned off.
- the equation (1) can be transformed into the following equation for obtaining the time constant ⁇ .
- the time constant ⁇ is determined by the product of the resistance value R of the discharge resistor 61 and the capacitance C of the smoothing capacitor 5 as the following equation.
- the resistance value R is It can be asked like.
- the discharge resistor 61 if the resistance value R of the discharge resistor 61 is not 1737 ⁇ or less, the discharge can not be performed within the target 2 seconds. For example, in the case where a resistance value of 1600 ⁇ is selected, if discharge is to be performed by the conventional method, rush power Pin such as the following equation is input to discharge resistor 61.
- the broken line in FIG. 2 shows the waveform in the case of discharge according to the conventional method.
- the gate signal of the MOSFET 62 remains ON for 2 seconds from the discharge start.
- the smoothing capacitor voltage decreases to about 41 V after 2 seconds, and the power of the discharge resistor 61 decreases with the attenuation of the smoothing capacitor voltage.
- the time for detecting a collision is set to 3 seconds, and the voltage is reduced in the remaining 2 seconds of the 5 seconds defined in the US Regulation FMVSS 305.
- the discharge resistor 61 As the discharge resistor 61, a metal clad type or the like having high inrush power tolerance is used, but the limit is still about 10 times the rated power. Therefore, conventionally, since the rush power Pin is about 160 W, a resistor having a rated power of about 16 W is required.
- the control circuit 7 sets the ON / OFF duty ratio (hereinafter referred to as the duty ratio) to 50%, with the first mode 0.5 second to the second mode 0.5 second from the discharge start as the second mode. , 100%, the MOSFET 62 is driven by PWM.
- the value of the rated power of the discharge resistor 61 can be made lower than before. Note that the rush power Pin does not increase so much even if the duty ratio is increased after discharging to a certain extent.
- the resistance value of the discharge resistor 61 is such that the discharge period is shortened by the idle period during PWM driving, and even if the value is smaller than the conventional one, the same target time as the conventional one can be achieved. For this reason, in the present embodiment, the resistance value of the discharge resistor 61 is 1500 ⁇ , and the rush power Pin in the first mode and the second mode averaged by the PWM drive is expressed by the equations (6) and (7), respectively. The rush power Pin is approximately half the power compared to the equation (5).
- the duty ratio at the start of discharge is set lower than that after that.
- the inrush power Pin is suppressed by lowering the duty ratio, and after the battery is discharged to some extent, the duty ratio is increased without prolonging the time until the discharge is completed. Inrush power can be suppressed, and excessive power can be prevented from being input to discharge resistor 61 even if power converter 10 is rapidly discharged.
- the power converter 10 for example, if the control pattern for the first mode and the second mode is created with a logic IC, the power converter 10 can be miniaturized because the modulation circuit is not necessary.
- the control circuit 7 sets the first mode for 0.5 seconds from the discharge start, the second mode for 0.5 seconds to 0.9 seconds, and the third mode for 0.9 seconds to 2 seconds.
- the MOSFET 62 is driven by PWM with the respective duty ratios being 30%, 50% and 100%.
- the rush power in each mode is 62.5 W, 63.0 W, 64.9 W, which is about 1/3 of the conventional rush power, and the discharge resistor 61 with lower allowable power compared to the above embodiment. It becomes possible to employ for the power converter 10.
- the present invention is not limited to this and the mode may be switched according to the smoothing capacitor voltage.
- the value of the smoothing capacitor voltage for switching this mode is set so that the rush power by the duty ratio in each mode becomes approximately the same.
- the present invention is not limited to this. May be changed gradually and continuously. In this case, it is possible to adopt the discharge resistor 61 having a lower allowable power to the power conversion device 10 as compared with the above-described embodiment.
Abstract
Provided are a power conversion device which keeps excessive power from being input to a discharging resistor even in the case of rapid electric discharge from the power conversion device, and a method for controlling the power conversion device. The power conversion device is provided with: a capacitor connected in parallel with an inverter circuit which converts DC power into AC power; a discharge circuit in which a discharging resistor and a switching element connected in parallel with the capacitor are connected in series; and a control circuit which controls electric discharge from the capacitor to the discharging resistor by controlling the switching element. The control circuit changes an ON/OFF duty ratio of the switching element at the time of electric discharge from the capacitor.
Description
本発明は、ハイブリッド自動車、電気自動車等の走行システムに適用される電力変換装置及びその制御方法に関する。
The present invention relates to a power conversion device applied to a traveling system such as a hybrid vehicle and an electric vehicle and a control method thereof.
ハイブリッド自動車、電気自動車のように高電圧バッテリによってモータを駆動するシステムでは、バッテリから電力変換装置を速やかに切り離したり、電力変換装置に残留した電荷を急速に放電したりすることが必要な場合がある。例えば、米国法規ＦＭＶＳＳ３０５（電気自動車の電解液の流出および感電防止）においては、車両が衝突などで停車してから５秒以内に、電力変換装置の出力電圧が所定の値になるまで放電をする必要がある。
In a system where a motor is driven by a high voltage battery such as a hybrid car or an electric car, it may be necessary to quickly separate the power converter from the battery or to rapidly discharge the residual charge in the power converter. is there. For example, under US regulation FMVSS 305 (electrolytic solution outflow and electric shock prevention for electric vehicles), discharge is performed until the output voltage of the power conversion device reaches a predetermined value within 5 seconds after the vehicle stops due to a collision or the like. There is a need.
本発明に関する従来例として例えば特許文献１，２がある。これらの従来例には、電力変換装置の放電用抵抗器がスイッチング素子を備え、電力変換装置の放電期間中スイッチング素子がオンされることによって、電力変換装置が急速に放電できることが開示されている。
For example, patent documents 1 and 2 exist as a prior art example regarding this invention. In these conventional examples, it is disclosed that the power conversion device can be discharged rapidly by the discharge resistor of the power conversion device including the switching element and the switching element being turned on during the discharge period of the power conversion device. .
従来の電力変換装置において、放電用抵抗器の抵抗値は平滑コンデンサの静電容量と、目標とする放電時間とにより決まるため、電力変換装置から急速に放電させようとすると、過大な電力が放電用抵抗器に入力され、発熱によって放電用抵抗器の内部が断線するおそれがある。そこで、過大な電力に耐えうる比較的大型の放電用抵抗器が電力変換装置に適用されていた。
In the conventional power converter, the resistance value of the discharge resistor is determined by the capacitance of the smoothing capacitor and the target discharge time, so if the power converter is to be rapidly discharged, the excessive power is discharged. There is a possibility that the inside of the discharge resistor may be disconnected due to the heat generation which is input to the resistor. Therefore, a relatively large discharge resistor that can withstand excessive power has been applied to the power conversion device.
本発明は以上の点を考慮してなされたもので、電力変換装置から急速に放電させても、過大な電力が放電用抵抗器に入力されないようにする電力変換装置及びその制御方法を提案しようとするものである。
The present invention has been made in consideration of the above points, and will propose a power conversion device and its control method for preventing excessive power from being input to the discharge resistor even if the power conversion device is discharged rapidly. It is said that.
かかる課題を解決するため本発明においては、電力変換装置において、直流電力を交流電力に変換するインバータ回路に並列接続するコンデンサと、コンデンサに並列接続したスイッチング素子及び放電用抵抗器を直列に接続した放電回路と、スイッチング素子を制御して、コンデンサから放電用抵抗器への放電を制御する制御回路とを備え、制御回路は、コンデンサからの放電の際、スイッチング素子のＯＮ／ＯＦＦデューティ比を変化させるようにした。
In order to solve such problems, in the present invention, in the power converter, a capacitor connected in parallel to an inverter circuit for converting DC power to AC power, and a switching element and a discharging resistor connected in parallel to the capacitor are connected in series. The control circuit includes a discharge circuit and a control circuit that controls the switching element to control discharging from the capacitor to the discharging resistor. The control circuit changes the ON / OFF duty ratio of the switching element when discharging from the capacitor. I let it go.
また本発明においては、電力変換装置の放電回路に接続されたスイッチング素子が制御回路によって制御されることにより、放電回路からの放電が実行されるようにした、電力変換装置の制御方法において、制御回路が、放電の際、スイッチング素子のＯＮ／ＯＦＦデューティ比を変化させるようにした。
Further, in the present invention, the control method of the power conversion device is such that discharge from the discharge circuit is performed by controlling the switching element connected to the discharge circuit of the power conversion device by the control circuit. The circuit changes the ON / OFF duty ratio of the switching element at the time of discharge.
本発明によれば、電力変換装置から急速に放電させても、過大な電力が放電用抵抗器に入力されないようにする電力変換装置及びその制御方法を実現できる。
According to the present invention, it is possible to realize a power conversion device and a control method thereof that prevent excessive power from being input to the discharge resistor even if the power conversion device is rapidly discharged.
以下、本発明の電力変換装置をハイブリッド自動車や電気自動車等の動力源としてモータを備える車両に適用した例を用いて、本発明の実施形態を説明する。
Hereinafter, an embodiment of the present invention will be described using an example in which the power conversion device of the present invention is applied to a vehicle provided with a motor as a motive power source such as a hybrid car or an electric car.
（１）本実施形態による電力変換装置の構成
図１に示すように、本電力変換装置１０を含む車両１５は、バッテリ１、コンタクタ２、インバータ回路３、モータ４、コンデンサ（平滑コンデンサ５）、放電回路６及び放電回路６の制御回路７を備えている。 (1) Configuration of Power Converter According to the Present Embodiment As shown in FIG. 1, avehicle 15 including the power converter 10 includes a battery 1, a contactor 2, an inverter circuit 3, a motor 4, a capacitor (smoothing capacitor 5), A discharge circuit 6 and a control circuit 7 of the discharge circuit 6 are provided.
図１に示すように、本電力変換装置１０を含む車両１５は、バッテリ１、コンタクタ２、インバータ回路３、モータ４、コンデンサ（平滑コンデンサ５）、放電回路６及び放電回路６の制御回路７を備えている。 (1) Configuration of Power Converter According to the Present Embodiment As shown in FIG. 1, a
バッテリ１は車両１５の電力源であって、バッテリ１からの直流電力はインバータ回路３によって交流電力に変換され、変換された交流電力がモータ４を駆動させる。そしてモータ４が車両１５を駆動させる。
The battery 1 is a power source of the vehicle 15, and DC power from the battery 1 is converted into AC power by the inverter circuit 3, and the converted AC power drives the motor 4. Then, the motor 4 drives the vehicle 15.
インバータ回路３は、６つのＩＧＢＴ（Insulated Gate Bipolar Transistor）３１を備え、例えば、２つのＩＧＢＴ３１からなる素子Ａ～Ｃから構成される。この素子Ａ～Ｃは３相交流のＵ相、Ｂ相及びＷ相に相当する。平滑コンデンサ５は、このインバータ回路３が動作するときに発生する電圧変動を抑制するために搭載されており、比較的大きな静電容量を必要とする。
The inverter circuit 3 includes six IGBTs (Insulated Gate Bipolar Transistors) 31 and is configured of, for example, elements A to C including two IGBTs 31. The elements A to C correspond to the U phase, the B phase, and the W phase of the three-phase alternating current. The smoothing capacitor 5 is mounted to suppress voltage fluctuation generated when the inverter circuit 3 operates, and requires a relatively large capacitance.
コンタクタ２は、バッテリ１と電力変換装置１０とを切り離す目的で搭載されており、イグニッションスイッチＯＮ時にＯＮ、イグニッションスイッチＯＦＦ時にＯＦＦとなる。またコンタクタ２は、電力変換装置１０の異常時や事故等により車両が衝撃を検出したときもＯＦＦとなる。
The contactor 2 is mounted for the purpose of separating the battery 1 and the power conversion device 10, and is turned on when the ignition switch is turned on and turned off when the ignition switch is turned off. The contactor 2 is also turned OFF when the vehicle detects an impact due to an abnormality of the power conversion device 10 or an accident.
放電回路６は、放電用抵抗器６１及びＭＯＳＦＥＴ６２から構成され、コンタクタ２がＯＦＦとなると、平滑コンデンサ５に充電された電荷を速やかに放電するように制御回路７によって制御される。なおここでは、スイッチング素子の一例としてＭＯＳＦＥＴ６２を挙げているが本発明はこれに限られない。
The discharge circuit 6 includes a discharge resistor 61 and a MOSFET 62, and is controlled by the control circuit 7 so as to quickly discharge the charge stored in the smoothing capacitor 5 when the contactor 2 is turned off. Although the MOSFET 62 is mentioned here as an example of the switching element, the present invention is not limited to this.
以下、本発明の特徴の説明を容易にするため、数値例を用いて説明する。
Hereinafter, in order to facilitate the description of the features of the present invention, it will be described using numerical examples.
バッテリ１の電圧Ｖｂａｔを５００Ｖ、平滑コンデンサ５の静電容量Ｃを５００μＦ、時定数をτとすると、平滑コンデンサ５の電圧Ｖｃと経過時間ｔとの関係は次式で表すことができる。ここで経過時間ｔは、コンタクタ２がＯＦＦとなってから平滑コンデンサ５の電圧Ｖｃが５０Ｖ以下まで放電する時間の目標である２秒とする。
Assuming that the voltage Vbat of the battery 1 is 500 V, the capacitance C of the smoothing capacitor 5 is 500 μF, and the time constant is τ, the relationship between the voltage Vc of the smoothing capacitor 5 and the elapsed time t can be expressed by the following equation. Here, it is assumed that the elapsed time t is 2 seconds, which is a target time for discharging the voltage Vc of the smoothing capacitor 5 to 50 V or less after the contactor 2 is turned off.
（１）式は時定数τを求める次式に変形することができる。
The equation (1) can be transformed into the following equation for obtaining the time constant τ.
時定数τは次式のように、放電用抵抗器６１の抵抗値Ｒ及び平滑コンデンサ５の静電容量Ｃの積で決まる。
The time constant τ is determined by the product of the resistance value R of the discharge resistor 61 and the capacitance C of the smoothing capacitor 5 as the following equation.
また（２）式及び（３）式から抵抗値Ｒは次式
のように求めることができる。
Also, from the equations (2) and (3), the resistance value R is
It can be asked like.
つまり、放電用抵抗器６１の抵抗値Ｒは１７３７Ω以下にしなければ、目標である２秒以内に放電できない。例えば１６００Ωの抵抗値を選定した場合、従来の方法で放電しようとすると、放電用抵抗器６１には次式のような突入電力Ｐｉｎが入力される。
That is, if the resistance value R of the discharge resistor 61 is not 1737 Ω or less, the discharge can not be performed within the target 2 seconds. For example, in the case where a resistance value of 1600 Ω is selected, if discharge is to be performed by the conventional method, rush power Pin such as the following equation is input to discharge resistor 61.
図２に破線で従来の方法で放電した場合の波形を示す。ＭＯＳＦＥＴ６２のゲート信号は放電開始から２秒間はＯＮのままとなっている。平滑コンデンサ電圧は２秒後には約４１Ｖまで低下し、放電用抵抗器６１の電力は、平滑コンデンサ電圧の減衰に伴って下がっている。なお本発明においては、衝突の検出のための時間を３秒とし、米国法規ＦＭＶＳＳ３０５において定められている５秒のうちの残り２秒で電圧を低減させるようにすることを想定している。
The broken line in FIG. 2 shows the waveform in the case of discharge according to the conventional method. The gate signal of the MOSFET 62 remains ON for 2 seconds from the discharge start. The smoothing capacitor voltage decreases to about 41 V after 2 seconds, and the power of the discharge resistor 61 decreases with the attenuation of the smoothing capacitor voltage. In the present invention, it is assumed that the time for detecting a collision is set to 3 seconds, and the voltage is reduced in the remaining 2 seconds of the 5 seconds defined in the US Regulation FMVSS 305.
放電用抵抗器６１にはメタルクラッド型等の突入電力耐量の大きなものが使用されるが、それでも定格電力の１０倍程度が限度である。このため、従来においては、突入電力Ｐｉｎが１６０Ｗ程度であるため１６Ｗ程度の定格電力を持つ抵抗が必要となる。
As the discharge resistor 61, a metal clad type or the like having high inrush power tolerance is used, but the limit is still about 10 times the rated power. Therefore, conventionally, since the rush power Pin is about 160 W, a resistor having a rated power of about 16 W is required.
本発明を適用した場合の波形を図２において実線で示す。制御回路７は、放電開始から０．５秒を第１モード、０．５秒から２秒を第２モードとして、それぞれのＯＮ／ＯＦＦデューティ比（以下、これをデューティ比と呼ぶ）を５０％，１００％として、ＭＯＳＦＥＴ６２をＰＷＭで駆動している。
A waveform when the present invention is applied is shown by a solid line in FIG. The control circuit 7 sets the ON / OFF duty ratio (hereinafter referred to as the duty ratio) to 50%, with the first mode 0.5 second to the second mode 0.5 second from the discharge start as the second mode. , 100%, the MOSFET 62 is driven by PWM.
なお言うまでもないが、デューティ比が高い程、平滑コンデンサ５の放電を完了させるまでの時間は短くて済むため、デューティ比を高くしたいが放電開始時にデューティ比を高くすると従来のように放電用抵抗器６１の持つ定格電力の値を高くしなければならない。
Although it is needless to say that the higher the duty ratio, the shorter the time until the discharge of the smoothing capacitor 5 is completed can be shortened. Therefore, it is desirable to increase the duty ratio. The power rating of 61 must be increased.
これに対して、放電開始時のデューティ比を低くし、突入電力Ｐｉｎが低くなる本発明においては放電用抵抗器６１の持つ定格電力の値を従来に比べて低くすることができる。なおある程度放電をした後であれば、デューティ比を高くしても、突入電力Ｐｉｎはそれほど高くなることはない。
On the other hand, in the present invention in which the duty ratio at the start of discharge is lowered and the inrush power Pin is lowered, the value of the rated power of the discharge resistor 61 can be made lower than before. Note that the rush power Pin does not increase so much even if the duty ratio is increased after discharging to a certain extent.
放電用抵抗器６１の抵抗値は、ＰＷＭ駆動中の休止期間の分だけ放電期間が短くなり、従来と比較して小さい値でも従来と同じ目標時間とすることができる。このため、本実施形態では放電用抵抗器６１の抵抗値を１５００Ωとしており、ＰＷＭ駆動により平均化された第１モード、及び第２モードの突入電力Ｐｉｎはそれぞれ（６）式及び（７）式のようになり、突入電力Ｐｉｎは（５）式と比較して、約半分の電力となる。
The resistance value of the discharge resistor 61 is such that the discharge period is shortened by the idle period during PWM driving, and even if the value is smaller than the conventional one, the same target time as the conventional one can be achieved. For this reason, in the present embodiment, the resistance value of the discharge resistor 61 is 1500Ω, and the rush power Pin in the first mode and the second mode averaged by the PWM drive is expressed by the equations (6) and (7), respectively. The rush power Pin is approximately half the power compared to the equation (5).
（２）本実施形態の効果
以上のように本実施形態の電力変換装置１０では、放電開始時のデューティ比をそれ以降に対して低く設定する。 (2) Effects of the Present Embodiment As described above, in thepower conversion device 10 of the present embodiment, the duty ratio at the start of discharge is set lower than that after that.
以上のように本実施形態の電力変換装置１０では、放電開始時のデューティ比をそれ以降に対して低く設定する。 (2) Effects of the Present Embodiment As described above, in the
従って、本電力変換装置１０によれば、放電開始時には、デューティ比を低くすることで突入電力Ｐｉｎを抑え、ある程度放電された後にデューティ比を高くすることで放電完了までの時間を長くすることなく突入電力を抑えることができ、電力変換装置１０から急速に放電させても、過大な電力が放電用抵抗器６１に入力されないようにすることができる。
Therefore, according to the power conversion device 10, at the start of discharge, the inrush power Pin is suppressed by lowering the duty ratio, and after the battery is discharged to some extent, the duty ratio is increased without prolonging the time until the discharge is completed. Inrush power can be suppressed, and excessive power can be prevented from being input to discharge resistor 61 even if power converter 10 is rapidly discharged.
なお本電力変換装置１０においては、例えばロジックＩＣで第１のモード及び第２のモードのための制御パータンを作成すればよく変調回路を要しないため電力変換装置１０の小型化も可能である。
In the power converter 10, for example, if the control pattern for the first mode and the second mode is created with a logic IC, the power converter 10 can be miniaturized because the modulation circuit is not necessary.
（３）他の実施形態
なお上述の実施形態においては、デューティ比の異なる２つのモードを利用した場合について述べたが、本発明はこれに限らず、デューティ比の異なる３つ以上のモードを利用するようにしても良い。 (3) Other Embodiments Although the above embodiment has described the case where two modes having different duty ratios are used, the present invention is not limited to this and three or more modes having different duty ratios are used. You may do it.
なお上述の実施形態においては、デューティ比の異なる２つのモードを利用した場合について述べたが、本発明はこれに限らず、デューティ比の異なる３つ以上のモードを利用するようにしても良い。 (3) Other Embodiments Although the above embodiment has described the case where two modes having different duty ratios are used, the present invention is not limited to this and three or more modes having different duty ratios are used. You may do it.
例えば図３に示すように制御回路７は、放電開始から０．５秒を第1モード、０．５秒から０．９秒を第２モード、０．９秒から２秒を第３モードとして、それぞれのデューティ比を３０％，５０％，１００％として、ＭＯＳＦＥＴ６２をＰＷＭで駆動する。それぞれのモードでの突入電力は、６２．５Ｗ，６３．０Ｗ，６４．９Ｗと従来の突入電力の１／３程度となり、上述の実施形態と比較し更に許容電力の低い放電用抵抗器６１を電力変換装置１０に採用することが可能となる。
For example, as shown in FIG. 3, the control circuit 7 sets the first mode for 0.5 seconds from the discharge start, the second mode for 0.5 seconds to 0.9 seconds, and the third mode for 0.9 seconds to 2 seconds. The MOSFET 62 is driven by PWM with the respective duty ratios being 30%, 50% and 100%. The rush power in each mode is 62.5 W, 63.0 W, 64.9 W, which is about 1/3 of the conventional rush power, and the discharge resistor 61 with lower allowable power compared to the above embodiment. It becomes possible to employ for the power converter 10.
また上述の実施形態においては、放電開始からの経過時間により制御回路７がモードを切り替る場合について述べたが、本発明はこれに限らず、平滑コンデンサ電圧によってモードを切り替えるようにしても良い。なおこのモードを切り替えるための平滑コンデンサ電圧の値は、それぞれのモードでのデューティ比による突入電力が同程度となるようにする。
In the above embodiment, although the case where the control circuit 7 switches the mode according to the elapsed time from the discharge start has been described, the present invention is not limited to this and the mode may be switched according to the smoothing capacitor voltage. The value of the smoothing capacitor voltage for switching this mode is set so that the rush power by the duty ratio in each mode becomes approximately the same.
さらに上述の実施形態においては、制御回路７がデューティ比の異なる２つのモードを利用しデューティ比を段階的に変化させる場合について述べたが、本発明はこれに限らず、制御回路７がデューティ比を連続的に徐々に変化させるようにしても良い。この場合上述の実施形態と比較し更に許容電力の低い放電用抵抗器６１を電力変換装置１０に採用することが可能となる。
Furthermore, in the above-mentioned embodiment, although the case where the control circuit 7 changes the duty ratio stepwise using two modes with different duty ratios has been described, the present invention is not limited to this. May be changed gradually and continuously. In this case, it is possible to adopt the discharge resistor 61 having a lower allowable power to the power conversion device 10 as compared with the above-described embodiment.
１……バッテリ、２……コンタクタ、３……インバータ回路、４……モータ、５……平滑コンデンサ、６……放電回路、７……制御回路、１０……電力変換装置、６１……放電用抵抗器、６２……ＭＯＳＦＥＴ。
DESCRIPTION OFSYMBOLS 1 ...... Battery 2, 2 ...... Contactor, 3 ...... Inverter circuit, 4 ...... Motor, 5 ...... Smoothing capacitor, 6 ...... Discharge circuit, 7 ...... Control circuit, 10 ...... Power conversion device, 61 ...... Discharge Resistor, 62 ... MOSFET.
DESCRIPTION OF
Claims (8)
- 直流電力を交流電力に変換するインバータ回路に並列接続するコンデンサと、
前記コンデンサに並列接続したスイッチング素子及び放電用抵抗器を直列に接続した放電回路と、
前記スイッチング素子を制御して、前記コンデンサから前記放電用抵抗器への放電を制御する制御回路と
を備え、
前記制御回路は、前記コンデンサからの放電の際、前記スイッチング素子のＯＮ／ＯＦＦデューティ比を変化させる
電力変換装置。 A capacitor connected in parallel to an inverter circuit that converts DC power into AC power;
A discharge circuit in which a switching element connected in parallel to the capacitor and a discharge resistor are connected in series;
A control circuit that controls the switching element to control discharge from the capacitor to the discharge resistor;
The said control circuit changes the ON / OFF duty ratio of the said switching element, when the said capacitor | condenser discharges. Power converter. - 前記制御回路は、放電を開始してから所定時間が経過した以降において、前記スイッチング素子のＯＮ／ＯＦＦデューティ比を増加させる
請求項１記載の電力変換装置。 The power conversion device according to claim 1, wherein the control circuit increases the ON / OFF duty ratio of the switching element after a predetermined time has elapsed since the start of the discharge. - 前記制御回路は、前記所定時間が経過するまでの第１モードと、所定時間経過した以降の第２モードと、に応じて、前記スイッチング素子のＯＮ／ＯＦＦデューティ比を変化させ、
前記第１モードに於ける前記スイッチング素子のＯＮ／ＯＦＦデューティ比より、前記第２モードにおける前記スイッチング素子のＯＮ／ＯＦＦデューティ比を増加させる
請求項２記載の電力変換装置。 The control circuit changes the ON / OFF duty ratio of the switching element according to a first mode until the predetermined time passes and a second mode after the predetermined time passes.
The power converter according to claim 2, wherein the ON / OFF duty ratio of the switching element in the second mode is increased from the ON / OFF duty ratio of the switching element in the first mode. - 前記制御回路は、放電を開始してから、前記コンデンサの電圧が所定の値まで下降した以降、前記スイッチング素子のＯＮ／ＯＦＦデューティ比を増加させる
請求項１記載の電力変換装置。 The power conversion device according to claim 1, wherein the control circuit increases the ON / OFF duty ratio of the switching element after the voltage of the capacitor falls to a predetermined value after the discharge is started. - 前記制御回路は、放電を開始してから、前記コンデンサの前記電圧が所定の値に下降するまでの第１モードと、前記コンデンサの前記電圧が所定の値に下降した以降の第２モードと、に応じて、前記スイッチング素子のＯＮ／ＯＦＦデューティ比を変化させ、
前記第１モードでの前記スイッチング素子のＯＮ／ＯＦＦデューティ比より前記第２モードでの前記スイッチング素子のＯＮ／ＯＦＦデューティ比を増加させる
請求項４記載の電力変換装置。 The control circuit is in a first mode until the voltage of the capacitor falls to a predetermined value after the discharge is started, and a second mode after the voltage of the capacitor falls to a predetermined value, Changing the ON / OFF duty ratio of the switching element according to
The power converter according to claim 4, wherein the ON / OFF duty ratio of the switching element in the second mode is increased from the ON / OFF duty ratio of the switching element in the first mode. - 前記制御回路は、放電を開始した以降に存在する複数のモードのそれぞれにおいて、前記スイッチング素子のＯＮ／ＯＦＦデューティ比を変化させる
請求項１記載の電力変換装置。 The power conversion device according to claim 1, wherein the control circuit changes an ON / OFF duty ratio of the switching element in each of a plurality of modes existing after the start of the discharge. - 前記制御回路が、前記スイッチング素子のＯＮ／ＯＦＦデューティ比を増加する際、当該デューティ比を連続的に変化させる
請求項１記載の電力変換装置。 The power conversion device according to claim 1, wherein the control circuit continuously changes the duty ratio when increasing the ON / OFF duty ratio of the switching element. - 電力変換装置の放電回路に接続されたスイッチング素子が制御回路によって制御されることにより、前記放電回路からの放電が実行されるようにした、電力変換装置の制御方法であって、
前記制御回路は、
放電の際、前記スイッチング素子のＯＮ／ＯＦＦデューティ比を変化させる
電力変換装置の制御方法。
A control method of a power conversion device, wherein discharge from the discharge circuit is performed by controlling a switching element connected to a discharge circuit of the power conversion device by a control circuit,
The control circuit
The control method of the power converter device which changes ON / OFF duty ratio of the said switching element at the time of discharge.
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| JP2017158393A JP2020202600A (en) | 2017-08-21 | 2017-08-21 | Power conversion equipment and method of controlling the same |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020105161A1 (en) | 2020-02-27 | 2021-09-02 | Audi Aktiengesellschaft | Method for operating an intermediate circuit for a motor vehicle and a corresponding intermediate circuit |
| DE112020003460T5 (en) | 2019-08-30 | 2022-04-07 | Hitachi Astemo, Ltd. | DISCHARGE CONTROL CIRCUIT AND POWER CONVERSION DEVICE |
| US11780334B2 (en) | 2020-09-24 | 2023-10-10 | Audi Ag | Control of the active discharge of a high-voltage intermediate circuit |
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|---|---|---|---|---|
| JP2013188092A (en) * | 2012-03-09 | 2013-09-19 | Aisin Aw Co Ltd | Inverter device for electric vehicle |
| JP2015116097A (en) * | 2013-12-13 | 2015-06-22 | 本田技研工業株式会社 | Discharge circuit failure detection device and discharge circuit failure detection method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013188092A (en) * | 2012-03-09 | 2013-09-19 | Aisin Aw Co Ltd | Inverter device for electric vehicle |
| JP2015116097A (en) * | 2013-12-13 | 2015-06-22 | 本田技研工業株式会社 | Discharge circuit failure detection device and discharge circuit failure detection method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112020003460T5 (en) | 2019-08-30 | 2022-04-07 | Hitachi Astemo, Ltd. | DISCHARGE CONTROL CIRCUIT AND POWER CONVERSION DEVICE |
| DE102020105161A1 (en) | 2020-02-27 | 2021-09-02 | Audi Aktiengesellschaft | Method for operating an intermediate circuit for a motor vehicle and a corresponding intermediate circuit |
| DE102020105161B4 (en) | 2020-02-27 | 2023-08-24 | Audi Aktiengesellschaft | Method for operating an intermediate circuit for a motor vehicle and corresponding intermediate circuit |
| US11780334B2 (en) | 2020-09-24 | 2023-10-10 | Audi Ag | Control of the active discharge of a high-voltage intermediate circuit |
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