JP2021164391A - Contactless power reception device - Google Patents

Contactless power reception device Download PDF

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JP2021164391A
JP2021164391A JP2020074400A JP2020074400A JP2021164391A JP 2021164391 A JP2021164391 A JP 2021164391A JP 2020074400 A JP2020074400 A JP 2020074400A JP 2020074400 A JP2020074400 A JP 2020074400A JP 2021164391 A JP2021164391 A JP 2021164391A
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power receiving
switch
circuit
coil
capacitor
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佳克 松垣
Yoshikatsu Matsugaki
大和 竹永
Yamato Takenaga
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Tecmo Electronic Co Ltd
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Tecmo Electronic Co Ltd
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Abstract

To provide a device to supply a constant voltage to a load with low loss by only a power reception device side, regardless of a circuit constant or a coupling coefficient of a power-transmitting side coil and a power-receiving side coil.SOLUTION: A contactless power reception device comprises: a power reception coil 5 supplied with AC power by the electromagnetic induction action; a resonance capacitor 6 connected in series to the coil; and a rectifier circuit 7 connected in series to the capacitor and the coil. Turning on or off a switch between two, positive and negative terminals of the rectifier circuit can turn on or off a resonance operation of a resonance circuit formed by the coil 1, capacitor and diode bridge. Connecting the capacitor in series to the switch allows DC voltage to be taken from both ends of the capacitor. Therefore, the device can be used as a power source for an electronic circuit serving as a load.SELECTED DRAWING: Figure 1

Description

本発明は、非接触給電装置に関し、特に非接触受電装置の制御技術に関する。 The present invention relates to a non-contact power feeding device, and more particularly to a control technique for a non-contact power receiving device.

近年、各種電気機器の充電、電気自動車への給電等の幅広い分野において、非接触で電力を伝送する非接触給電技術が用いられるようになってきている。非接触給電装置では、送受コイル間の相対位置や負荷電流、素子定数の変動により出力電圧が変化し、出力電圧が規定値から外れるおそれがある。例えば負荷が軽くなった場合やコイルが近づきすぎた場合は、出力電圧が必要以上に上昇してしまうため、例えば特許文献１には、共振コンデンサの両端にスイッチを配置して、負荷が軽くなった場合にスイッチをオンして共振コンデンサの両端を短絡して負荷側への電流を遮断することにより負荷側の電圧の上昇を抑制し、また特許文献２には、ダイオードブリッジの交流入力部を短絡することにより負荷側への電流を遮断することにより負荷側の電圧の上昇を抑制する技術が開示されている。 In recent years, non-contact power supply technology for transmitting electric power in a non-contact manner has come to be used in a wide range of fields such as charging of various electric devices and power supply to electric vehicles. In a non-contact power feeding device, the output voltage may change due to fluctuations in the relative position between the transmission / reception coils, the load current, and the element constant, and the output voltage may deviate from the specified value. For example, if the load becomes lighter or the coil gets too close, the output voltage will rise more than necessary. Therefore, for example, in Patent Document 1, switches are arranged at both ends of the resonance capacitor to reduce the load. In this case, the switch is turned on to short-circuit both ends of the resonant capacitor to cut off the current to the load side, thereby suppressing the voltage rise on the load side. A technique for suppressing an increase in voltage on the load side by interrupting the current on the load side by short-circuiting is disclosed.

特開平１０−２４８１８３号公報Japanese Unexamined Patent Publication No. 10-248183 特開２０１６−１５８４７１号公報Japanese Unexamined Patent Publication No. 2016-158471

しかしながら、特許文献１の技術では、共振コンデンサの両端を短絡することで平滑コンデンサに電流を供給しない期間を制御することにより負荷側の直流電圧を一定になるように制御しているが、共振コンデンサの両端の短絡時にもダイオードブリッジを経由して受電コイルに電流が流れ続けており、電力の無駄が生じる。 However, in the technique of Patent Document 1, the DC voltage on the load side is controlled to be constant by controlling the period during which the current is not supplied to the smoothing capacitor by short-circuiting both ends of the resonance capacitor. Even when both ends of the circuit are short-circuited, current continues to flow through the power receiving coil via the diode bridge, resulting in waste of power.

また、特許文献２の技術では、ダイオードブリッジ交流入力端子間を短絡することで、負荷側に電流を供給しない期間を制御することにより負荷側の直流電圧を一定になるように制御しているが、ダイオードブリッジの交流入力端子間の短絡時には、共振回路が構成されており、この期間に大きな共振電流が流れ続けるので、電力の無駄が生じる。 Further, in the technique of Patent Document 2, the DC voltage on the load side is controlled to be constant by controlling the period during which the current is not supplied to the load side by short-circuiting the AC input terminals of the diode bridge. When the AC input terminals of the diode bridge are short-circuited, a resonance circuit is configured, and a large resonance current continues to flow during this period, resulting in waste of power.

本発明は上記事情に鑑みてなされたものであり、その目的は入力電圧、負荷電流、素子定数の変動に対する出力電圧制御を、低損失で且つ送受間の通信という複雑な処理をすることなく受電側のみで実現可能な非接触受電装置を提供することにある。 The present invention has been made in view of the above circumstances, and an object of the present invention is to control output voltage with respect to fluctuations in input voltage, load current, and device constant, with low loss and without complicated processing of communication between transmission and reception. The purpose is to provide a non-contact power receiving device that can be realized only on the side.

本発明に係る非接触受電装置の第１の構成は、電力供給ユニットから非接触給電によって電力を取得する受電コイルと、共振コンデンサと、ダイオードがブリッジ接続された整流回路とスイッチとを有し、前記受電コイルの端子の一方と前記共振コンデンサの端子の一方が接続され、前記共振コンデンサの他方の端子と前記整流回路の交流端子の一方と接続され、前記整流回路の他方の交流端子と前記受電コイルの他方の端子とが接続され、前記整流回路の正の端子とスイッチの一方の端子が接続されており、前記スイッチの他方の端子と前記整流回路の負の端子が接続されていることを特徴とする。 The first configuration of the non-contact power receiving device according to the present invention includes a power receiving coil that acquires power from a power supply unit by non-contact power supply, a resonance capacitor, and a rectifier circuit and a switch to which a diode is bridge-connected. One of the terminals of the power receiving coil and one of the terminals of the resonance capacitor are connected, the other terminal of the resonance capacitor and one of the AC terminals of the rectifier circuit are connected, and the other AC terminal of the rectifier circuit and the power receiving are received. The other terminal of the coil is connected, the positive terminal of the rectifier circuit and one terminal of the switch are connected, and the other terminal of the switch and the negative terminal of the rectifier circuit are connected. It is a feature.

この構成によれば、交流電力の供給を受ける受電コイルと、このコイルと直列に接続される共振コンデンサとダイオードがブリッジ接続された整流回路により直列共振回路が構成され、前記整流回路の正負の端子間にスイッチが接続され、スイッチをＯＮまたはＯＦＦすることにより、直列共振回路に電流を流したり、あるいは遮断することができ、遮断時には共振回路による損失が発生しないので、損失を抑制することが可能となる。また、前記遮断時には送電側からみた受電装置のインピーダンスが非常に大きくなるので、送電側の電力損失も抑制することが可能となる。 According to this configuration, a series resonance circuit is composed of a power receiving coil that receives AC power supply and a rectifying circuit in which a resonant capacitor connected in series with the coil and a diode are bridge-connected, and positive and negative terminals of the rectifying circuit are formed. A switch is connected between them, and by turning the switch on or off, a current can be passed through or cut off in the series resonant circuit, and loss due to the resonant circuit does not occur at the time of breaking down, so loss can be suppressed. It becomes. Further, when the power is cut off, the impedance of the power receiving device as seen from the power transmission side becomes very large, so that it is possible to suppress the power loss on the power transmission side.

本発明に係る非接触受電装置の第２の構成は、前記非接触受電装置は、前記スイッチに直列に平滑コンデンサが接続されており、前記スイッチのＯＮ時に、前記平滑コンデンサの２つの端子間に直流電圧を生成し、負荷となる電子回路に前記直流電圧を供給することを特徴とする。 The second configuration of the non-contact power receiving device according to the present invention is that the non-contact power receiving device has a smoothing capacitor connected in series with the switch, and when the switch is turned on, between the two terminals of the smoothing capacitor. It is characterized in that a DC voltage is generated and the DC voltage is supplied to an electronic circuit that serves as a load.

この構成によれば、前記スイッチがＯＮ時に前記スイッチに直列に接続された平滑コンデンサに電流が供給され、前記平滑コンデンサの両端に直流電圧を生成し、ここから負荷となる電子回路に前記直流電圧を供給することが可能となる。 According to this configuration, when the switch is turned on, a current is supplied to a smoothing capacitor connected in series with the switch, a DC voltage is generated across the smoothing capacitor, and the DC voltage is generated from this to an electronic circuit as a load. Can be supplied.

本発明に係る非接触受電装置の第３の構成は、前記非接触受電装置は、前記受電コイルに発生する交流電圧の変化に基づいて、前記スイッチをＯＮまたはＯＦＦを制御することにより、前記コンデンサの両端に生成する直流電圧を制御することを特徴とする。 The third configuration of the non-contact power receiving device according to the present invention is that the non-contact power receiving device controls the switch ON or OFF based on the change of the AC voltage generated in the power receiving coil, thereby controlling the capacitor. It is characterized in that the DC voltage generated across the above is controlled.

この構成によれば、スイッチのＯＮまたはＯＦＦのタイミングと共振回路に流れる電流とのタイミング関係により、前記スイッチの両端や平滑コンデンサの両端に発生するパルス状のノイズ電圧を抑制することが可能となる。 According to this configuration, it is possible to suppress the pulsed noise voltage generated at both ends of the switch and both ends of the smoothing capacitor by the timing relationship between the ON or OFF timing of the switch and the current flowing through the resonance circuit. ..

本発明に係る非接触受電装置の第４の構成は、前記非接触受電装置は、前記コイルおよび前記共振コンデンサおよび前記整流回路に直列に負荷となる電子回路が接続された構成であることを特徴とする。 A fourth configuration of the non-contact power receiving device according to the present invention is characterized in that the non-contact power receiving device is configured such that an electronic circuit as a load is connected in series with the coil, the resonance capacitor, and the rectifier circuit. And.

この構成によれば、ヒーターや交流駆動が可能な交流点灯用ＬＥＤ等の交流負荷を、前記コイルや前記共振コンデンサに直列に接続する構成にすることにより、前記スイッチのＯＮまたはＯＦＦにより、交流負荷への電流供給をＯＮまたはＯＦＦにすることが可能となる。 According to this configuration, an AC load such as a heater or an AC lighting LED capable of AC driving is connected in series with the coil or the resonance capacitor, so that the AC load can be turned on or off by turning the switch on or off. It is possible to turn on or off the current supply to.

本発明に係非接触受電装置の第５の構成は、前記非接触受電装置は、前記受電コイルの両端に生じる交流電圧を整流して得た直流電圧を前記スイッチ制御回路に供給することを特徴とする。 A fifth configuration of the non-contact power receiving device according to the present invention is characterized in that the non-contact power receiving device supplies a DC voltage obtained by rectifying an AC voltage generated at both ends of the power receiving coil to the switch control circuit. And.

この構成によれば、前記受電コイルの両端に生成する交流電圧を整流して得た直流電圧を前記スイッチの制御回路用の電源にすることにより、請求項１乃至４における前記スイッチ制御回路へ前記直流電圧を供給することが可能となる。 According to this configuration, the DC voltage obtained by rectifying the AC voltage generated at both ends of the power receiving coil is used as the power supply for the control circuit of the switch, whereby the switch control circuit according to claims 1 to 4 is used. It becomes possible to supply a DC voltage.

本発明によれば、共振回路の動作を電気的にＯＮまたはＯＦＦにできるので、受電電力を制御する際に、共振回路の損失を低減することができ、また送電側との通信も必要ないので、低コストの装置の実現が可能になる。 According to the present invention, since the operation of the resonance circuit can be electrically turned on or off, the loss of the resonance circuit can be reduced when controlling the received power, and communication with the power transmission side is not required. , It becomes possible to realize a low-cost device.

本発明に係る非接触受電装置を含む非接触給電装置の実施図である。It is an execution drawing of the non-contact power feeding device including the non-contact power receiving device which concerns on this invention. 図１に示す回路の共振回路を構成する共振コンデンサに流れる電流波形をシミュレーションした結果を示す図である。It is a figure which shows the result of simulating the current waveform flowing through the resonance capacitor which constitutes the resonance circuit of the circuit shown in FIG. 図１に記載の回路のスイッチに直列に平滑コンデンサおよび前記平滑コンデンサに並列に負荷を挿入した、本発明の第２の構成の実施例である。It is an embodiment of the second configuration of the present invention in which a smoothing capacitor and a load are inserted in parallel with the smoothing capacitor in series with the switch of the circuit shown in FIG. 本発明の第３の構成の実施例である。This is an example of the third configuration of the present invention. 本発明の第４の構成の実施例である。This is an example of the fourth configuration of the present invention. 交流点灯用ＬＥＤを使用した場合の、本発明の第４の構成の実施例である。This is an embodiment of the fourth configuration of the present invention when an AC lighting LED is used. 本発明の第５の構成の実施例である。This is an example of the fifth configuration of the present invention.

以下、本発明を実施するための形態について、図面を参照しながら説明する。尚，以下の実施の形態は，本発明を具体化した一例であって，本発明の技術的範囲を限定する性格のものではない。 Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The following embodiments are examples that embody the present invention, and do not limit the technical scope of the present invention.

図１は、本発明の基本となる実施形態であり、図２が図１において４つのダイオードがブリッジ接続された整流回路７の正負端子間を短絡および開放しながら、共振回路を構成する共振コンデンサ６に流れる電流波形のシミュレーション結果である。 FIG. 1 is a basic embodiment of the present invention, and FIG. 2 shows a resonance capacitor that constitutes a resonance circuit while short-circuiting and opening between the positive and negative terminals of a rectifying circuit 7 in which four diodes are bridge-connected in FIG. It is a simulation result of the current waveform flowing in 6.

受電コイル５と共振コンデンサ６と整流回路７の交流端子で共振回路が構成され、整流回路７の正負端子間を短絡することにより共振回路が動作し、また整流回路７の正負端子間を開放することにより、共振回路が電気的に遮断されるため共振電流が流れることができず共振動作を停止する。 A resonance circuit is formed by the power receiving coil 5, the resonance capacitor 6, and the AC terminal of the rectifying circuit 7, and the resonance circuit operates by short-circuiting the positive and negative terminals of the rectifying circuit 7, and the positive and negative terminals of the rectifying circuit 7 are opened. As a result, the resonance circuit is electrically cut off, so that the resonance current cannot flow and the resonance operation is stopped.

図３は、スイッチ８に直列に平滑コンデンサ９と負荷１０を挿入した回路図であり、平滑コンデンサ９の両端に直流電圧が発生し、負荷１０を構成する電子回路に直流電圧を供給することができ、スイッチのＯＮまたはＯＦＦの時間を制御することにより、この直流電圧を制御することが可能となる。 FIG. 3 is a circuit diagram in which a smoothing capacitor 9 and a load 10 are inserted in series with the switch 8, and a DC voltage is generated across the smoothing capacitor 9 to supply the DC voltage to the electronic circuits constituting the load 10. It is possible to control this DC voltage by controlling the ON or OFF time of the switch.

図４は、スイッチ８をＯＮまたはＯＦＦする制御信号を受電コイル５の交流電圧波形に基づいて生成する構成の実施例である。コイル５と共振コンデンサ６と整流回路７で構成される共振回路に流れる電流波形の状態とスイッチ８のＯＮまたはＯＦＦするタイミング関係によっては、大きなパルス性の電圧を発生する恐れがあるが、前記タイミングを最適に制御することにより、前記パルス性の高電圧を抑えることが可能となる。 FIG. 4 is an example of a configuration in which a control signal for turning ON or OFF the switch 8 is generated based on the AC voltage waveform of the power receiving coil 5. A large pulse voltage may be generated depending on the state of the current waveform flowing in the resonance circuit composed of the coil 5, the resonance capacitor 6, and the rectifier circuit 7 and the timing of turning the switch 8 on or off. By optimally controlling the above, it is possible to suppress the pulsed high voltage.

図５は、ヒーター等の交流で動作する負荷１１の場合の実施例であり、スイッチ８をＯＮまたはＯＦＦすることにより、ヒーターに流れる電流をＯＮまたはＯＦＦすることができ、ヒーターの温度制御が可能となる。 FIG. 5 shows an example in the case of a load 11 that operates by alternating current such as a heater. By turning the switch 8 on or off, the current flowing through the heater can be turned on or off, and the temperature of the heater can be controlled. It becomes.

図６は交流で動作する交流点灯用ＬＥＤを共振回路に直列に挿入した実施例であり、スイッチ８をＯＮまたはＯＦＦすることにより、ＬＥＤを点灯させたり、消灯させたりの制御をすることが可能となる。 FIG. 6 shows an example in which an AC lighting LED that operates by alternating current is inserted in series in a resonance circuit, and it is possible to control whether the LED is turned on or off by turning the switch 8 on or off. It becomes.

図７は、図５あるいは図６のように共振回路に直列に挿入した負荷のＯＮまたはＯＦＦを制御する回路において、受電コイルの両端に生成する交流電圧を整流して得た直流電圧をスイッチ制御回路に供給している実施例であり、ダイオード１４の代わりにブリッジ接続された整流回路を使用することも可能である。 FIG. 7 shows a switch control of a DC voltage obtained by rectifying an AC voltage generated at both ends of a power receiving coil in a circuit for controlling ON or OFF of a load inserted in series with a resonance circuit as shown in FIG. 5 or 6. It is an embodiment supplied to the circuit, and it is also possible to use a bridge-connected rectifier circuit instead of the diode 14.

なお、スイッチ８としては、Ｎ−ＭＯＳＦＥＴやＰ−ＭＯＳＦＥＴ等の半導体やリレー等のメカニカルスイッチも使用可能である。 As the switch 8, a semiconductor such as an N-MOSFET or a P-MOSFET or a mechanical switch such as a relay can also be used.

１…非接触送電装置
２…非接触受電装置
３…送電コイル駆動回路
４…送電コイル
５…受電コイル
６…共振コンデンサ
７…整流回路
８…スイッチ
９…平滑コンデンサ
１０…負荷（電子回路）
１１…交流負荷（ヒーター等）
１２…スイッチ制御回路
１３…ＬＥＤ
１４…整流用ダイオード1 ... Non-contact power transmission device 2 ... Non-contact power receiving device 3 ... Power transmission coil drive circuit 4 ... Power transmission coil 5 ... Power receiving coil 6 ... Resonant capacitor 7 ... Rectifying circuit 8 ... Switch 9 ... Smoothing capacitor 10 ... Load (electronic circuit)
11 ... AC load (heater, etc.)
12 ... Switch control circuit 13 ... LED
14 ... Rectifying diode

Claims (5)

電力供給ユニットから非接触給電によって電力を取得する受電コイルと、共振コンデンサと、ダイオードがブリッジ接続された整流回路とスイッチとを有し、前記受電コイルの端子の一方と前記共振コンデンサの端子の一方が接続され、前記共振コンデンサの他方の端子と前記整流回路の交流端子の一方と接続され、前記整流回路の他方の交流端子と前記受電コイルの他方の端子とが接続され、前記整流回路の正の端子とスイッチの一方の端子が接続されており、前記スイッチの他方の端子と前記整流回路の負の端子が接続されていることを特徴とする、非接触受電装置。 It has a power receiving coil that acquires power from a power supply unit by non-contact power supply, a resonance capacitor, a rectifying circuit and a switch to which a diode is bridge-connected, and one of the terminals of the power receiving coil and one of the terminals of the resonance capacitor. Is connected, the other terminal of the resonance capacitor and one of the AC terminals of the rectifier circuit are connected, the other AC terminal of the rectifier circuit and the other terminal of the power receiving coil are connected, and the positive of the rectifier circuit is connected. A non-contact power receiving device, wherein one terminal of the switch and one terminal of the switch are connected, and the other terminal of the switch and a negative terminal of the rectifying circuit are connected. 前記非接触受電装置は、前記スイッチに直列に平滑コンデンサが接続されており、前記スイッチのＯＮ時に、前記平滑コンデンサの２つの端子間に直流電圧を生成し、負荷となる電子回路に前記直流電圧を供給することを特徴とする、請求項１の非接触受電装置。 In the non-contact power receiving device, a smoothing capacitor is connected in series with the switch, and when the switch is turned on, a DC voltage is generated between the two terminals of the smoothing capacitor, and the DC voltage is generated in an electronic circuit serving as a load. The non-contact power receiving device according to claim 1, wherein the power receiving device is provided. 前記非接触受電装置は、前記受電コイルに発生する交流電圧の変化に基づいて、前記スイッチをＯＮまたはＯＦＦを制御することにより、前記コンデンサの両端に生成する直流電圧を制御することを特徴とする、請求項２の非接触受電装置。 The non-contact power receiving device is characterized in that the DC voltage generated across the capacitor is controlled by controlling the switch ON or OFF based on the change in the AC voltage generated in the power receiving coil. , The non-contact power receiving device according to claim 2. 前記非接触受電装置は、前記コイルおよび前記共振コンデンサおよび前記整流回路に直列に負荷となる電子回路が接続された構成であることを特徴とする、請求項１乃至３の非接触受電装置。 The non-contact power receiving device according to claim 1 to 3, wherein the non-contact power receiving device has a configuration in which an electronic circuit serving as a load is connected in series with the coil, the resonance capacitor, and the rectifier circuit. 前記非接触受電装置は、前記受電コイルの両端に生じる交流電圧を整流して得た直流電圧を前記スイッチ制御回路に供給することを特徴とする、請求項１乃至４の非接触受電装置。 The non-contact power receiving device according to any one of claims 1 to 4, wherein the non-contact power receiving device supplies a DC voltage obtained by rectifying an AC voltage generated at both ends of the power receiving coil to the switch control circuit.
JP2020074400A 2020-03-31 2020-03-31 Contactless power reception device Pending JP2021164391A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021166927A (en) * 2020-05-29 2021-10-21 株式会社三洋物産 Game machine
JP2022136178A (en) * 2021-03-03 2022-09-15 株式会社三洋物産 game machine
JP2022141901A (en) * 2021-02-22 2022-09-29 株式会社三洋物産 game machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021166927A (en) * 2020-05-29 2021-10-21 株式会社三洋物産 Game machine
JP2022141901A (en) * 2021-02-22 2022-09-29 株式会社三洋物産 game machine
JP2022136178A (en) * 2021-03-03 2022-09-15 株式会社三洋物産 game machine

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