JP2673876B2 - Driving circuit for electromagnetic induction coil and charging device using the driving circuit - Google Patents
Driving circuit for electromagnetic induction coil and charging device using the driving circuitInfo
- Publication number
- JP2673876B2 JP2673876B2 JP6329271A JP32927194A JP2673876B2 JP 2673876 B2 JP2673876 B2 JP 2673876B2 JP 6329271 A JP6329271 A JP 6329271A JP 32927194 A JP32927194 A JP 32927194A JP 2673876 B2 JP2673876 B2 JP 2673876B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- source
- electromagnetic induction
- induction coil
- drain
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、コードレス電話機等の
電源として利用される二次電池（充電式電池）を、電磁
誘導で電力を伝送することにより非接触（電気接続を伴
わない）で充電するための電磁誘導コイルの駆動回路及
び該駆動回路を用いた充電装置に係り、とくに雑音の影
響を極端に嫌うために電磁誘導の際の使用周波数を数１
００ｋＨｚ以上に上げる必要のある機器の二次電池充電
に適した電磁誘導コイルの駆動回路及び該駆動回路を用
いた充電装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention charges a secondary battery (rechargeable battery) used as a power source for a cordless telephone or the like in a contactless manner (without electrical connection) by transmitting electric power by electromagnetic induction. The present invention relates to a drive circuit for an electromagnetic induction coil and a charging device using the drive circuit. In particular, the frequency used for electromagnetic induction is 1
The present invention relates to a drive circuit of an electromagnetic induction coil suitable for charging a secondary battery of equipment that needs to be raised to 00 kHz or higher, and a charging device using the drive circuit.
【０００２】[0002]
【従来の技術】従来、電動歯ブラシ等で利用されていた
非接触充電器は、スイッチングレギュレータ用の回路を
応用し、ＲＣＣ回路（リンギング・チョーク・コンバー
タ回路）やロイヤー発振回路で電磁誘導コイルを駆動
し、充電部側の電磁誘導コイルから受電部側の受電コイ
ルへ電磁誘導によって電力伝送を行っていた。それらの
発振回路は商用交流電源の直接入力（ＡＣ１００Ｖの場
合、整流後のＤＣ１４１Ｖをそのまま使用）であって
も、発振コイルとしての電磁誘導コイルの励磁インダク
タンスが大きくとれるため、周波数が３０〜１００ｋＨ
ｚで殆ど問題なく動作する。2. Description of the Related Art Non-contact chargers that have been conventionally used in electric toothbrushes, etc., apply circuits for switching regulators to drive electromagnetic induction coils with RCC circuits (ringing choke converter circuits) and Royer oscillation circuits. However, power is transmitted from the electromagnetic induction coil on the charging unit side to the power receiving coil on the power receiving unit side by electromagnetic induction. These oscillator circuits have a frequency of 30 to 100 kHz because the exciting inductance of the electromagnetic induction coil as the oscillation coil can be large even if the commercial AC power source is directly input (DC 141 V after rectification is used as it is in the case of AC 100 V).
Works with almost no problems with z.
【０００３】[0003]
【発明が解決しようとする課題】ところで、３０〜１０
０ｋＨｚ程度の周波数を使用して電力伝送を行う場合に
は、使用する機器によっては３０〜１００ｋＨｚの発振
周波数の高調波が雑音として悪影響を及ぼす問題があ
る。例えば、コードレス電話機は２８０ＭＨｚのセンタ
ーキャリアに対し１バンド１２.５ｋＨｚで８９チャン
ネル持つため、１.１ＭＨｚより低い周波数で電磁誘導
による非接触充電を行う場合、通話信号の中に発振周波
数の高調波が雑音として妨害を与える問題がある。By the way, 30 to 10
When power transmission is performed using a frequency of about 0 kHz, there is a problem that harmonics having an oscillation frequency of 30 to 100 kHz adversely affect as noise depending on the device used. For example, since a cordless telephone has 89 channels at 12.5 kHz per band for a center carrier of 280 MHz, when contactless charging by electromagnetic induction is performed at a frequency lower than 1.1 MHz, harmonics of the oscillation frequency are included in the call signal. There is a problem of interference as noise.
【０００４】しかしながら、従来一般的なＲＣＣ回路や
ロイヤー発振回路で発振周波数を上げるには、いずれも
発振コイルの励磁インダクタンスを小さくする必要があ
り、商用交流電源の直接入力による使用は困難となり、
入力電圧を変圧器内蔵のアダプター等で下げて発振コイ
ルの励磁電流を小さくする方法しか無かった。実験で
は、それらのＲＣＣ回路やロイヤー発振回路ではＡＣ１
００Ｖの直接入力で３００ｋＨｚが入力５Ｗ以下にする
ための限界であり、発振周波数を１.１ＭＨｚ以上に設
定するには不十分な回路となっていた。However, in order to increase the oscillation frequency in the conventional general RCC circuit and Royer oscillation circuit, it is necessary to reduce the exciting inductance of the oscillation coil, which makes it difficult to use the commercial AC power source by direct input.
The only way to reduce the exciting current of the oscillating coil is to lower the input voltage with an adapter with a built-in transformer. In the experiment, AC1 was used for those RCC circuits and Royer oscillator circuits.
With a direct input of 00 V, 300 kHz is the limit for making the input 5 W or less, and the circuit was insufficient to set the oscillation frequency to 1.1 MHz or more.
【０００５】高周波発振回路としては、ハートレー型、
コルピッツ型発振回路があるが、信号レベルでの応用が
殆どで、電力を取り出すために設計されたものでは無か
った。また、充電装置への使用を考慮した場合、発熱が
少なく、すなわち効率が良く、しかも二次電池を充電し
ていないときの電力消費を抑える必要があるが、従来の
高周波発振回路にはこのような配慮がないため、非充電
時の電力損失が多い嫌いがある。As the high frequency oscillation circuit, Hartley type,
Although there is a Colpitts type oscillation circuit, it is mostly applied at the signal level and was not designed to extract electric power. In addition, when considering use in a charging device, it is necessary to generate less heat, that is, to improve efficiency, and to suppress power consumption when the secondary battery is not being charged. Since there is no consideration, there is a lot of dislike of power loss when not charging.
【０００６】なお、非充電時の電力損失を低減するもの
として実開昭５７−１９２７３７号の充電回路がある
が、充電部に対する受電部の結合を検出するコイル等が
必要となって回路構成が複雑化する嫌いがあり、また非
充電時に発振回路が間欠発振するため、コードレス電話
機等の用途においては、やはり高調波による雑音妨害の
危険性がある。There is a charging circuit of Japanese Utility Model Laid-Open No. 57-192737 as a means for reducing power loss during non-charging, but a coil or the like for detecting the coupling of the power receiving section to the charging section is required and the circuit configuration is There is a risk of complication, and since the oscillator circuit oscillates intermittently when not charged, there is still a risk of noise interference due to harmonics in applications such as cordless telephones.
【０００７】本発明の第１の目的は、上記の点に鑑み、
高周波発振により電磁誘導結合のための電磁誘導コイル
を効率よく励磁でき、発熱及び電力損失の少ない電磁誘
導コイルの駆動回路を提供することにある。[0007] A first object of the present invention is to solve the above problems,
An object of the present invention is to provide a drive circuit for an electromagnetic induction coil that can efficiently excite an electromagnetic induction coil for electromagnetic induction coupling by high frequency oscillation, and generate less heat and power loss.
【０００８】本発明の第２の目的は、コードレス電話機
等のような雑音の影響を極端に嫌う機器に対する高周波
発振の高調波に起因する雑音妨害を回避することが可能
な電磁誘導コイルの駆動回路を提供することにある。A second object of the present invention is a drive circuit of an electromagnetic induction coil capable of avoiding noise interference caused by harmonics of high frequency oscillation in a device such as a cordless telephone which is extremely disliked by the influence of noise. To provide.
【０００９】本発明の第３の目的は、高周波を用いた電
磁誘導結合により非接触で効率的に電力伝送が可能で、
発熱及び電力損失が少なく、しかもコードレス電話機等
のような雑音の影響を極端に嫌う機器に対する高周波発
振の高調波に起因する雑音妨害を回避可能な充電装置を
提供することにある。A third object of the present invention is to enable non-contact and efficient power transmission by electromagnetic induction coupling using high frequency.
It is an object of the present invention to provide a charging device that generates less heat and power, and that can avoid noise interference caused by harmonics of high-frequency oscillation with respect to devices such as cordless telephones that are extremely disliked by noise.
【００１０】本発明のその他の目的や新規な特徴は後述
の実施例において明らかにする。Other objects and novel features of the present invention will be clarified in the embodiments described later.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するため
に、本発明の電磁誘導コイルの駆動回路は、電界効果ト
ランジスタのドレイン、ゲート間に磁束発生用電磁誘導
コイルと直流阻止用の第１のコンデンサとの直列回路を
接続し、ゲート、ソース間に第２のコンデンサを接続
し、ドレイン、ソース間に第３のコンデンサを接続し、
前記ドレイン、ゲート間の誘導性と、前記ゲート、ソー
ス間及びドレイン、ソース間の容量性とで自励発振回路
を構成し、前記第２及び第３のコンデンサの接続点と前
記ソースとの間に抵抗を挿入するとともに、前記電界効
果トランジスタにスイッチング動作を行わせる構成とし
ている。To achieve the above object, a drive circuit for an electromagnetic induction coil according to the present invention comprises a magnetic flux generating electromagnetic induction coil between a drain and a gate of a field effect transistor and a first direct current blocking circuit. Connect a series circuit with the capacitor of, connect the second capacitor between the gate and the source, connect the third capacitor between the drain and the source,
A self-excited oscillation circuit is formed by the inductive property between the drain and the gate and the capacitive property between the gate and the source and between the drain and the source, and between the connection point of the second and third capacitors and the source. A resistor is inserted in and the field effect transistor is made to perform a switching operation.
【００１２】また、前記電磁誘導コイルの駆動回路にお
いて、前記自励発振回路の発振周波数を１.１ＭＨｚ以
上に設定してもよい。In the drive circuit of the electromagnetic induction coil, the oscillation frequency of the self-excited oscillation circuit may be set to 1.1 MHz or higher.
【００１３】本発明の充電装置は、電界効果トランジス
タのドレイン、ゲート間に磁束発生用電磁誘導コイルと
直流阻止用の第１のコンデンサとの直列回路を接続し、
ゲート、ソース間に第２のコンデンサを接続し、ドレイ
ン、ソース間に第３のコンデンサを接続し、前記ドレイ
ン、ゲート間の誘導性と、前記ゲート、ソース間及びド
レイン、ソース間の容量性とで自励発振回路を構成し、
前記第２及び第３のコンデンサの接続点と前記ソースと
の間に抵抗を挿入するとともに、前記電界効果トランジ
スタにスイッチング動作を行わせる駆動回路を具備し、
該駆動回路を充電部ケース内に設けた充電部と、前記充
電部ケース内に配置された前記磁束発生用電磁誘導コイ
ルに電磁結合可能な受電コイル及び該受電コイルの誘起
電圧を整流して二次電池に供給する整流回路を受電部ケ
ース内に配置してなる受電部とを備えた構成である。In the charging device of the present invention, a series circuit of a magnetic flux generating electromagnetic induction coil and a DC blocking first capacitor is connected between the drain and gate of the field effect transistor,
A second capacitor is connected between the gate and the source, and a third capacitor is connected between the drain and the source, the inductive property between the drain and the gate, and the capacitive property between the gate and the source and between the drain and the source. Configure a self-excited oscillation circuit with
A drive circuit for inserting a resistor between the connection point of the second and third capacitors and the source and for causing the field effect transistor to perform a switching operation;
A charging unit provided with the drive circuit in a charging unit case, a power receiving coil electromagnetically coupled to the magnetic flux generating electromagnetic induction coil disposed in the charging unit case, and an induced voltage of the power receiving coil are rectified to generate two. The power receiving unit has a rectifying circuit that supplies the secondary battery in a power receiving unit case.
【００１４】また、前記充電装置において、前記電磁誘
導コイルは中央部の先端面が周辺部よりも一段高くなっ
た断面凸状フェライトコアに、前記中央部を周回する環
状巻線を設けた構成でもよい。In the charging device, the electromagnetic induction coil may have a structure in which a ferrite core having a convex cross section in which a front end surface of a central portion is higher than a peripheral portion is provided with an annular winding winding around the central portion. Good.
【００１５】さらに、前記受電コイルに対し第４のコン
デンサが接続され、前記受電コイルと第４のコンデンサ
とで前記発振回路の発振周波数で共振する共振回路を構
成してもよい。Further, a fourth capacitor may be connected to the power receiving coil, and the power receiving coil and the fourth capacitor may constitute a resonance circuit that resonates at the oscillation frequency of the oscillation circuit.
【００１６】[0016]
【作用】本発明の電磁誘導コイルの駆動回路及び該駆動
回路を用いた充電装置においては、高周波発振を行うコ
ルピッツ型自励発振回路で駆動回路を構成しており、数
１００ｋＨｚ乃至数１０ＭＨｚの発振周波数で安定に発
振でき、しかも商用交流電源の直接入力（ＡＣ１００Ｖ
の場合、整流後のＤＣ１４１Ｖをそのまま使用）が可能
であり、回路構成の簡略化ができ、その駆動回路を用い
て電磁誘導コイルを励振することで非接触で受電部側の
受電コイルに電力伝送ができる。In the drive circuit of the electromagnetic induction coil and the charging device using the drive circuit of the present invention, the drive circuit is constituted by a Colpitts type self-excited oscillation circuit which oscillates at a high frequency, and an oscillation of several 100 kHz to several 10 MHz is generated. It can oscillate stably at a frequency and is directly input to a commercial AC power supply
In the case of, DC141V after rectification can be used as it is), the circuit configuration can be simplified, and the drive circuit can excite the electromagnetic induction coil to transmit power to the power receiving coil on the power receiving unit side without contact. You can
【００１７】そして、コードレス電話機等のような雑音
の影響を極端に嫌う機器に応用する場合、当該機器に高
周波発振の高調波が雑音妨害を与えないように発振周波
数を適切に設定することも可能である。When applied to a device such as a cordless telephone which is extremely unfavorable to the influence of noise, it is possible to appropriately set the oscillation frequency so that harmonics of high frequency oscillation do not cause noise interference in the device. Is.
【００１８】さらに、発振トランジスタとして電界効果
トランジスタを用い、ゲートバイアス電圧を低めに設定
して当該電界効果トランジスタにスイッチング動作を行
わせることで、バイポーラ型トランジスタ等のようなバ
イアス電流を必要とするものに比べて、効率を上げるこ
とができ、ひいては発熱の低減及び電力損失の低減を図
ることができる。Further, a field effect transistor is used as an oscillating transistor, and a gate bias voltage is set to a low level to cause the field effect transistor to perform a switching operation, thereby requiring a bias current like a bipolar type transistor. The efficiency can be increased, and as a result, heat generation and power loss can be reduced.
【００１９】また、前記電磁誘導コイルと共に共振回路
を構成するコンデンサの接続点と電界効果トランジスタ
のソースとの間に抵抗を挿入することで、電界効果トラ
ンジスタに加わるピーク電圧を低減して電界効果トラン
ジスタとして耐圧の低いものを使用できるとともに、そ
の抵抗により発振電力の調整が可能である。Further, by inserting a resistor between the connection point of the capacitor forming the resonance circuit together with the electromagnetic induction coil and the source of the field effect transistor, the peak voltage applied to the field effect transistor is reduced and the field effect transistor is reduced. It is possible to use a low withstand voltage, and the oscillation power can be adjusted by the resistance.
【００２０】さらに、前記自励発振回路の発振周波数を
１.１ＭＨｚ以上に設定すれば、とくにコードレス電話
機への使用に適した構成とすることができる。すなわ
ち、２８０ＭＨｚのセンターキャリアに対し１バンド１
２.５ｋＨｚで８９チャンネル持つコードレス電話機に
対して発振周波数の高調波が通話信号に雑音妨害を与え
ないように設定できる。Further, if the oscillation frequency of the self-excited oscillation circuit is set to be 1.1 MHz or more, it is possible to make the configuration particularly suitable for use in a cordless telephone. That is, one band for one center carrier of 280 MHz
For a cordless telephone with 89 channels at 2.5 kHz, it can be set so that harmonics of the oscillation frequency do not interfere with the call signal.
【００２１】また、充電装置において、充電部側（送電
側）の前記電磁誘導コイルを、中央部の先端面が周辺部
よりも一段高くなった断面凸状フェライトコアに、前記
中央部を周回する環状巻線を設けた構成とした場合、受
電部側の受電コイルとの間の電磁結合度を大きくしかつ
電磁誘導コイルの外形寸法を小型化することができる。Further, in the charging device, the electromagnetic induction coil on the charging portion side (power transmission side) is wound around the central portion with a ferrite core having a convex cross section in which the front end surface of the central portion is one step higher than the peripheral portion. In the case of providing the annular winding, the degree of electromagnetic coupling with the power receiving coil on the power receiving unit side can be increased and the external dimensions of the electromagnetic induction coil can be reduced.
【００２２】さらに、前記受電コイルに対しコンデンサ
を接続して前記発振回路の発振周波数で共振する共振回
路を構成した場合、前記電磁誘導コイルと受電コイルと
を電磁結合させた状態において高周波発振波形が前記共
振回路で波形整形され（正弦波に近い波形にされ）、ス
プリアス雑音を少なくすることができる。Further, when a capacitor is connected to the power receiving coil to form a resonance circuit that resonates at the oscillation frequency of the oscillation circuit, a high-frequency oscillation waveform is generated when the electromagnetic induction coil and the power receiving coil are electromagnetically coupled. The resonant circuit performs waveform shaping (waveform close to a sine wave) to reduce spurious noise.
【００２３】[0023]
【実施例】以下、本発明に係る電磁誘導コイルの駆動回
路及び該駆動回路を用いた充電装置の実施例を図面に従
って説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electromagnetic induction coil drive circuit and a charging device using the drive circuit according to the present invention will be described below with reference to the drawings.
【００２４】図１乃至図２は電磁誘導コイルの駆動回路
及び該駆動回路を用いた充電装置の実施例の全体構成で
あって、図１は回路図、図２は機械的構造を示す断面図
である。これらの図において、充電装置は充電部１と、
これより電磁誘導による電力伝送を受ける受電部２とか
らなっており、充電部１は高周波の磁束を発生する送電
側の電磁誘導コイルＬ１とこれを励磁する駆動回路４と
商用電源入力（ＡＣ１００Ｖ、５０Ｈｚ／６０Ｈｚ）を
整流平滑する一次側整流平滑回路５とを具備している。1 and 2 show the overall structure of an embodiment of a drive circuit for an electromagnetic induction coil and a charging device using the drive circuit. FIG. 1 is a circuit diagram and FIG. 2 is a sectional view showing a mechanical structure. Is. In these figures, the charging device includes a charging unit 1,
The charging unit 1 includes a power receiving unit 2 that receives power transmission by electromagnetic induction, and the charging unit 1 includes an electromagnetic induction coil L1 on the power transmission side that generates a high-frequency magnetic flux, a drive circuit 4 that excites the electromagnetic induction coil L1, and a commercial power input (AC100V, And a primary side rectifying / smoothing circuit 5 for rectifying and smoothing (50 Hz / 60 Hz).
【００２５】図１に示すように、駆動回路４の発振用ト
ランジスタは電界効果トランジスタの１種であって入力
インピーダンスの高いＭＯＳ ＦＥＴ Ｑ１であり、駆動
回路４は、ＭＯＳ ＦＥＴ Ｑ１と、該ＭＯＳ ＦＥＴ Ｑ
１のゲートに所定のゲートバイアス電圧を印加する抵抗
Ｒ１，Ｒ２と、ドレイン、ゲート間に接続された高周波
の磁束発生用の電磁誘導コイルＬ１と直流阻止用のコン
デンサＣ１との直列回路と、ゲート、ソース間のコンデ
ンサＣ２と、ドレイン、ソース間のコンデンサＣ３と、
コンデンサＣ２，Ｃ３の接続点と前記ソースとの間に挿
入された抵抗Ｒ３と、ドレインに接続された正側コネク
タ端子Ｐ１と負側コネクタ端子Ｐ２間に接続されたコン
デンサＣ４と、前記コンデンサＣ２，Ｃ３の接続点と負
側端子Ｐ２とを接続するコイルＬ２とからなっている。
そして、ＭＯＳ ＦＥＴ Ｑ１のドレイン、ゲート間の誘
導性と、ゲート、ソース間及びドレイン、ソース間の容
量性とでコルピッツ型自励発振回路を構成している。As shown in FIG. 1, the oscillating transistor of the drive circuit 4 is a MOS FET Q1 having a high input impedance, which is one kind of field effect transistor. The drive circuit 4 includes a MOS FET Q1 and the MOS FET. Q
A series circuit of resistors R1 and R2 for applying a predetermined gate bias voltage to the gate of No. 1, an electromagnetic induction coil L1 for generating high-frequency magnetic flux and a capacitor C1 for blocking direct current, which are connected between the drain and the gate; , A capacitor C2 between the source and a capacitor C3 between the drain and the source,
A resistor R3 inserted between the connection point of the capacitors C2 and C3 and the source, a capacitor C4 connected between the positive side connector terminal P1 and the negative side connector terminal P2 connected to the drain, and the capacitor C2. The coil L2 connects the connection point of C3 and the negative terminal P2.
The inductive property between the drain and the gate of the MOS FET Q1 and the capacitive property between the gate and the source and between the drain and the source form a Colpitts self-excited oscillation circuit.
【００２６】なお、ＭＯＳ ＦＥＴ Ｑ１にゲートバイア
ス電圧を印加するための抵抗Ｒ１，Ｒ２は、ソースを基
準としたゲート電位が零Ｖ近傍（ソースとほぼ同じ電
位）となるように動作バイアス点を設定する。これによ
り、電磁誘導コイルＬ１両端に発生する交流電圧がゲー
トに対し正の向きに加わったときのみＭＯＳ ＦＥＴ Ｑ
１がオンとなり、負の向きに加わったときはオフとな
り、ＭＯＳ ＦＥＴ Ｑ１がスイッチング動作を行うよう
にする。The resistors R1 and R2 for applying the gate bias voltage to the MOS FET Q1 are set at the operation bias point so that the gate potential with reference to the source is near 0 V (potential almost the same as the source). To do. As a result, the MOS FET Q is applied only when the AC voltage generated across the electromagnetic induction coil L1 is applied in the positive direction with respect to the gate.
1 is turned on, and when it is applied in the negative direction, it is turned off so that the MOS FET Q1 performs a switching operation.
【００２７】図２乃至図５に示すように、駆動回路４は
プリント基板１１に回路部品１２を搭載して組み立てら
れており、樹脂等の非磁性材の内ケース１３の底部（下
段）側に収納固定されている。また、プリント基板１１
には前記正側コネクタ端子Ｐ１と負側コネクタ端子Ｐ２
とを有するコネクタ１４が固着されていおり、該コネク
タ１４の正側コネクタ端子Ｐ１と負側コネクタ端子Ｐ２
とは内ケース１３の側面開口１５より外部に露出してい
る。As shown in FIGS. 2 to 5, the drive circuit 4 is assembled by mounting the circuit component 12 on the printed circuit board 11, and is mounted on the bottom (lower) side of the inner case 13 made of a non-magnetic material such as resin. The storage is fixed. The printed circuit board 11
The positive side connector terminal P1 and the negative side connector terminal P2.
And a positive connector terminal P1 and a negative connector terminal P2 of the connector 14 are fixed.
Is exposed to the outside through the side opening 15 of the inner case 13.
【００２８】また、前記電磁誘導コイルＬ１は中央部
（柱状部）２０ａの先端面が周辺部２０ｂよりも一段高
くなった断面凸状フェライトコア２０に、前記中央部２
０ａを周回する環状巻線２１を設けたものであり、例え
ば断面凸状フェライトコア２０として固有抵抗の高いＮ
i−Ｚn系フェライトコアを用い、環状巻線２１として融
着性被覆導線（いわゆるセメントワイヤー）を巻回し
て、加熱処理、溶剤処理等で導線の各巻回部分を相互に
固着したものを前記コア中央部２０ａに嵌合することで
ボビンレス構造とすることができる。このような電磁誘
導コイルＬ１は、中央部２０ａの先端面が内ケース１３
の上面開口に向くようにして当該内ケース１３の開口
（上段）側に配置、固定される（内ケース１３に対する
接着等で固定される）。なお、電磁誘導コイルＬ１の外
形は、例えば縦３４mm×横２６mm×厚み３.３mm程度で
ある。Further, in the electromagnetic induction coil L1, the central portion 2 is formed on the ferrite core 20 having a convex cross section in which the tip end surface of the central portion (columnar portion) 20a is one step higher than that of the peripheral portion 20b.
0a is provided, and an annular winding 21 is provided. For example, as a ferrite core 20 having a convex cross section, N having a high specific resistance is used.
The core is obtained by winding a fusible coated conductive wire (so-called cement wire) as the annular winding 21 using an i-Zn ferrite core and fixing each wound portion of the conductive wire to each other by heat treatment, solvent treatment or the like. A bobbinless structure can be obtained by fitting the central portion 20a. In such an electromagnetic induction coil L1, the tip surface of the central portion 20a is the inner case 13
Is arranged and fixed on the opening (upper) side of the inner case 13 so as to face the upper surface opening (fixed by adhesion or the like to the inner case 13). The outer shape of the electromagnetic induction coil L1 is, for example, about 34 mm length × 26 mm width × thickness 3.3 mm.
【００２９】駆動回路４及び電磁誘導コイルＬ１を配設
した内ケース１３の周囲にはカバー１６が被せられてい
る。このカバー１６は、内ケース１３の開口部分を除い
た幅広の３面（底面及び両側面）を少なくとも覆うこと
ができるように折り曲げ形成したものである。A cover 16 covers the inner case 13 in which the drive circuit 4 and the electromagnetic induction coil L1 are arranged. The cover 16 is formed by bending so as to cover at least three wide surfaces (a bottom surface and both side surfaces) of the inner case 13 excluding an opening portion.
【００３０】このように、内ケース１３内に駆動回路４
と電磁誘導コイルＬ１とを収納し、内ケース１３の外側
にカバー１６を被せることで電磁誘導による送電ユニッ
ト３０が構成され、この送電ユニット３０はカバー１６
の取付用折曲部１７を利用して充電部ケース３１の内側
に固定される。すなわち、送電ユニット３０の取付用折
曲部１７が充電部ケース３１の内側の係止部３２に嵌め
込まれて固定される。このとき、電磁誘導コイルＬ１の
断面凸状フェライトコア２０の中央部２０ａを充電部ケ
ース３１の内面に密着乃至近接対向させる。なお、送電
ユニット３０を充電部ケース３１内にビス等で固定する
こともできる。In this way, the drive circuit 4 is provided in the inner case 13.
The power transmission unit 30 by electromagnetic induction is configured by accommodating the electromagnetic induction coil L1 and the electromagnetic induction coil L1 and covering the outside of the inner case 13 with the cover 16.
It is fixed to the inside of the charging section case 31 by utilizing the mounting bent section 17 of. That is, the mounting bent portion 17 of the power transmission unit 30 is fitted and fixed in the locking portion 32 inside the charging portion case 31. At this time, the central portion 20a of the ferrite core 20 having a convex cross section of the electromagnetic induction coil L1 is brought into close contact with or close to the inner surface of the charging portion case 31. The power transmission unit 30 may be fixed in the charging unit case 31 with screws or the like.
【００３１】前記コネクタ１４の正側コネクタ端子Ｐ１
と負側コネクタ端子Ｐ２に直流電源電圧を供給するため
に図１の一次側整流平滑回路５が充電部ケース３１内に
設けられている。この一次側整流平滑回路５は、ヒュー
ズＦを介し交流商用電源（ＡＣ１００Ｖ）を受ける整流
器ＤＳ及び平滑用コンデンサＣ５を有している。Positive side connector terminal P1 of the connector 14
The primary side rectifying and smoothing circuit 5 of FIG. 1 is provided in the charging section case 31 in order to supply the DC power supply voltage to the negative side connector terminal P2. The primary side rectifying / smoothing circuit 5 includes a rectifier DS that receives an AC commercial power source (AC100V) via a fuse F and a smoothing capacitor C5.
【００３２】一方、受電部２は、内蔵するニッケル−カ
ドミウム（Ｎi−Ｃd）電池等の繰り返し充電の行える複
数の二次電池Ｂを充電するために、受電コイルＬ３及び
この両端に接続されたコンデンサＣ６からなっていて前
記駆動回路４の発振周波数に同調した並列共振回路と、
該並列共振回路の誘起電圧を整流平滑する二次側整流平
滑回路としてのダイオードＤ１及び平滑用コンデンサＣ
７と、トランジスタＱ２、定電圧ダイオードＺＤ及び抵
抗Ｒ４からなる電圧安定化回路４２と、電流安定化用の
抵抗Ｒ５，Ｒ６及び抵抗Ｒ６に並列接続された切換用ト
ランジスタＱ３とからなる電流切換回路４３と、逆流防
止用ダイオードＤ２とを有し、これらの回路は図２の受
電部ケース４０内のプリント基板４１上に組み立てられ
ている。On the other hand, the power receiving section 2 is provided with a power receiving coil L3 and capacitors connected to both ends of the power receiving coil L3 to charge a plurality of rechargeable batteries B such as a built-in nickel-cadmium (Ni-Cd) battery which can be repeatedly charged. A parallel resonance circuit composed of C6 and tuned to the oscillation frequency of the drive circuit 4;
A diode D1 and a smoothing capacitor C as a secondary side rectifying / smoothing circuit for rectifying and smoothing the induced voltage of the parallel resonant circuit.
7, a voltage stabilizing circuit 42 including a transistor Q2, a constant voltage diode ZD and a resistor R4, and a switching transistor Q3 connected in parallel with the current stabilizing resistors R5 and R6 and the resistor R6. 2 and a backflow prevention diode D2, and these circuits are assembled on the printed circuit board 41 in the power receiving unit case 40 of FIG.
【００３３】前記受電コイルＬ３は、例えば外形が縦３
０mm×横２６mm×厚み１.６mmであって図６及び図７に
示すように、偏平有底筒状ボビン５０の筒状部５１の内
側に偏平フェライトコア５２を巻回固着し、筒状部５１
の外周に環状巻線５３を巻回固着し、ボビン５０の底面
側に一対の端子５４を固着したものである。受電コイル
Ｌ３は図２のように受電部ケース４０内側に対し偏平フ
ェライトコア５２を密着乃至近接対向させた状態で固着
され、各端子５４は前記プリント基板４１に接続され
る。受電コイルＬ３の偏平フェライトコア５２の先端面
形状は電磁誘導コイルＬ１の断面凸状フェライトコア２
０の中央部２０ａの形状とほぼ同じである。The power receiving coil L3 has, for example, a vertical external shape of 3
As shown in FIGS. 6 and 7, the flat ferrite core 52 is wound and fixed inside the tubular portion 51 of the flat-bottomed tubular bobbin 50, which is 0 mm × width 26 mm × thickness 1.6 mm. 51
An annular winding 53 is wound around and fixed to the outer periphery of the bobbin 50, and a pair of terminals 54 is fixed to the bottom surface of the bobbin 50. As shown in FIG. 2, the power receiving coil L3 is fixed to the inside of the power receiving unit case 40 with the flat ferrite core 52 in close contact with or close to each other, and each terminal 54 is connected to the printed circuit board 41. The shape of the end surface of the flat ferrite core 52 of the power receiving coil L3 is the ferrite core 2 having a convex cross section of the electromagnetic induction coil L1.
It is almost the same as the shape of the central portion 20a of 0.
【００３４】なお、受電部２を図２のように充電部１に
結合配置したとき、電磁誘導コイルＬ１と受電コイルＬ
３とのギャップは例えば６mmとした。When the power receiving section 2 is connected to the charging section 1 as shown in FIG. 2, the electromagnetic induction coil L1 and the power receiving coil L are arranged.
The gap with 3 is 6 mm, for example.
【００３５】この実施例の構成において、充電部１内の
駆動回路４に一次側整流平滑回路５から商用電源を整流
平滑した電圧を印加すれば、コルピッツ型自励発振回路
を構成している駆動回路４は次式で定まる発振周波数ｆ
oscで発振を開始する。In the configuration of this embodiment, if a voltage obtained by rectifying and smoothing the commercial power source from the primary side rectifying / smoothing circuit 5 is applied to the driving circuit 4 in the charging section 1, the drive forming the Colpitts type self-excited oscillation circuit is formed. The circuit 4 has an oscillation frequency f determined by the following equation.
Start oscillation with osc.
【００３６】[0036]
【数１】 但し、ΔＹeはソース（エミッタ）接地の場合における
トランジスタのＹパラメータの周波数に寄与する成分で
ある。このΔＹeはバイポーラトランジスタの場合大き
な値で温度変動により大きく変化するが、ＭＯＳ ＦＥ
Ｔの場合には小さな値で無視でき、ｆoscが温度変動に
かかわらず安定し、負荷変動に対しても安定である。こ
こで、コードレス電話機の場合、発振周波数は１.１Ｍ
Ｈｚ以上に設定して、通話信号中に発振周波数の高調波
が雑音妨害を与えないようにする。また、ゲートバイア
ス電圧印加用の抵抗Ｒ１，Ｒ２はＭＯＳ ＦＥＴ Ｑ１が
スイッチング動作を行うようにゲート電圧を低めに設定
してあるので、図８に示す如く発振時のＭＯＳ ＦＥＴ
Ｑ１のソース、ドレイン間電圧波形（ドレインを０Ｖ基
準として示す）は半サイクルのみ導通するスイッチング
動作となっている。従って、発振回路の電力損失を少な
くすることができる。また、ＭＯＳ ＦＥＴ Ｑ１のソー
ス側に挿入された抵抗Ｒ３の抵抗値を適切に設定するこ
とで、ソース、ドレイン間電圧のピーク値を低下させて
ＭＯＳ ＦＥＴ Ｑ１の耐圧の問題を解消している。すな
わち、抵抗Ｒ３が無いと前記ソース、ドレイン間電圧の
ピーク値は相当高く、ＭＯＳ ＦＥＴ Ｑ１の耐圧不足と
なる危険性があるが、抵抗Ｒ３を挿入することでピーク
値が抑えられ（例えば図８のように抵抗Ｒ３を６８０Ω
に選んだ場合ＭＯＳ ＦＥＴ Ｑ１のドレイン、ソース間
のピーク電圧は５５Ｖ抑制され、５０５Ｖが４５０Ｖ程
度以下に抑えられ）、耐圧不足は無くなる。なお、抵抗
Ｒ３は数１００Ω程度が好ましく、１００Ωより小さい
と電圧抑制効果が少なく、１０００Ωより大きいと電力
損失の増大が問題となる。(Equation 1) However, ΔYe is a component that contributes to the frequency of the Y parameter of the transistor when the source (emitter) is grounded. This ΔYe is a large value in the case of a bipolar transistor and changes greatly due to temperature fluctuations.
In the case of T, a small value can be ignored, and fosc is stable regardless of temperature fluctuations and is stable against load fluctuations. Here, in the case of a cordless telephone, the oscillation frequency is 1.1M
Set it to Hz or higher so that harmonics of the oscillation frequency do not cause noise interference during a call signal. Further, since the gate bias voltage applying resistors R1 and R2 are set to have a low gate voltage so that the MOS FET Q1 performs a switching operation, as shown in FIG.
The voltage waveform between the source and the drain of Q1 (the drain is shown with 0V as a reference) is a switching operation in which conduction occurs only in a half cycle. Therefore, the power loss of the oscillation circuit can be reduced. Further, by appropriately setting the resistance value of the resistor R3 inserted on the source side of the MOS FET Q1, the peak value of the voltage between the source and the drain is lowered and the problem of the breakdown voltage of the MOS FET Q1 is solved. That is, without the resistor R3, the peak value of the voltage between the source and the drain is considerably high, and there is a risk that the withstand voltage of the MOS FET Q1 may be insufficient, but the peak value is suppressed by inserting the resistor R3 (for example, FIG. 8). Resistance R3 to 680Ω
In the case of the selection, the peak voltage between the drain and source of the MOS FET Q1 is suppressed to 55V and 505V is suppressed to about 450V or less), and the lack of withstand voltage is eliminated. The resistance R3 is preferably about several hundred Ω. If it is less than 100Ω, the voltage suppressing effect is small, and if it is more than 1000Ω, an increase in power loss becomes a problem.
【００３７】そして、図２のように充電部ケース３１上
に受電部ケース４０を載置して送電側の電磁誘導コイル
Ｌ１と受電コイルＬ３とを対面させ電磁結合させた状態
では、それらはトランスとして実質的に機能し電磁誘導
コイルＬ１の環状巻線２１がトランス一次巻線、受電コ
イルＬ３の環状巻線５３が二次巻線となって電磁誘導で
電力が伝送される。このとき受電コイルＬ３とコンデン
サＣ６とで駆動回路４の発振周波数に一致する共振周波
数を持つ並列共振回路が構成されているので波形整形作
用があり、図９のように電磁誘導コイルＬ１に流れる励
磁電流波形は正弦波に近似した波形で、誘起電圧波形も
同じく正弦波に近い波形となり、スプリアス雑音の発生
を低減できる。Then, as shown in FIG. 2, when the power receiving unit case 40 is placed on the charging unit case 31 and the power transmission side electromagnetic induction coil L1 and the power receiving coil L3 are faced to each other and electromagnetically coupled, they are transformers. The annular winding 21 of the electromagnetic induction coil L1 serves as a transformer primary winding, and the annular winding 53 of the power receiving coil L3 serves as a secondary winding to transmit electric power by electromagnetic induction. At this time, the power receiving coil L3 and the capacitor C6 form a parallel resonance circuit having a resonance frequency that matches the oscillation frequency of the drive circuit 4, so that there is a waveform shaping action and the excitation that flows in the electromagnetic induction coil L1 as shown in FIG. The current waveform is a waveform similar to a sine wave, and the induced voltage waveform is also a waveform close to a sine wave, so that the generation of spurious noise can be reduced.
【００３８】前記受電コイルＬ３の両端の誘起電圧は二
次側整流平滑回路としてのダイオードＤ１及び平滑用コ
ンデンサＣ７で整流、平滑されて電圧安定化回路４２に
加えられる。電圧安定化回路４２では定電圧ダイオード
ＺＤによりトランジスタＱ２のベース電圧が一定値とさ
れるため、トランジスタＱ２のエミッタに安定化された
出力電圧が得られる。電流切換回路４３の切換用トラン
ジスタＱ３は受電部２内のＣＰＵ（中央演算処理部）か
ら急速充電を指示するハイレベルの電圧信号がベースに
印加されているときはオンであり、電流安定化用の抵抗
Ｒ５及びオン状態の切換用トランジスタＱ３とを通して
電圧安定化回路４２の直流出力で二次電池Ｂを急速充電
する。The induced voltage across the power receiving coil L3 is rectified and smoothed by the diode D1 as a secondary side rectifying and smoothing circuit and the smoothing capacitor C7, and then applied to the voltage stabilizing circuit 42. In the voltage stabilization circuit 42, the base voltage of the transistor Q2 is set to a constant value by the constant voltage diode ZD, so that a stabilized output voltage is obtained at the emitter of the transistor Q2. The switching transistor Q3 of the current switching circuit 43 is ON when a high-level voltage signal for instructing quick charging is applied to the base from the CPU (central processing unit) in the power receiving unit 2, and for current stabilization. The secondary battery B is rapidly charged by the DC output of the voltage stabilizing circuit 42 through the resistor R5 and the switching transistor Q3 in the ON state.
【００３９】前記二次電池Ｂの急速充電が完了した後
は、前記ＣＰＵからの電圧信号はローレベルとなり、切
換用トランジスタＱ３はオフに変わり、二次電池の自然
放電を補うためのトリクル充電を行うようにする。すな
わち、電流安定化用の抵抗Ｒ５，Ｒ６を通して微小電流
で二次電池Ｂの充電が行われる。After the rapid charging of the secondary battery B is completed, the voltage signal from the CPU becomes low level, the switching transistor Q3 is turned off, and trickle charging for supplementing the spontaneous discharge of the secondary battery is performed. Try to do it. That is, the secondary battery B is charged with a minute current through the current stabilizing resistors R5 and R6.
【００４０】この実施例によれば、次の通りの効果を得
ることができる。According to this embodiment, the following effects can be obtained.
【００４１】(1) 駆動回路４として構成が簡単で、部
品点数の少ない自励式コルピッツ発振回路を用いてお
り、数１００ｋＨｚ乃至数１０ＭＨｚの発振周波数で安
定に発振可能であり、駆動回路４で電磁誘導コイルＬ１
を励磁することにより受電部側の受電コイルＬ３に非接
触で電力伝送ができる。その際、商用交流電源を直接整
流平滑した直流電圧で駆動回路４を動作させることがで
き、この点でも構成の簡略化が可能である。また、コー
ドレス電話機の充電装置として利用する場合、駆動回路
４の発振周波数を１.１ＭＨｚ以上に設定して通話信号
の中に発振周波数の高調波が入らないように設定可能
で、高調波による雑音妨害の発生を回避することができ
る。(1) As the drive circuit 4, a self-excited Colpitts oscillator circuit having a simple structure and a small number of parts is used, and it is possible to stably oscillate at an oscillation frequency of several 100 kHz to several tens of MHz. Induction coil L1
Is excited, the electric power can be transmitted to the power receiving coil L3 on the power receiving unit side in a non-contact manner. At that time, the drive circuit 4 can be operated by the DC voltage obtained by directly rectifying and smoothing the commercial AC power supply, and the configuration can be simplified also in this respect. When used as a charging device for cordless telephones, the oscillation frequency of the drive circuit 4 can be set to 1.1 MHz or higher so that harmonics of the oscillation frequency do not enter the call signal, and noise due to harmonics can be set. It is possible to avoid the occurrence of interference.
【００４２】(2) 駆動回路４の発振トランジスタとし
て電界効果トランジスタであるＭＯＳＦＥＴ Ｑ１を用
いており、バイポーラトランジスタのようなバイアス電
流を必要とせず、しかもＭＯＳ ＦＥＴ Ｑ１のゲートバ
イアス電圧の低めに設定することでＭＯＳ ＦＥＴ Ｑ１
にスイッチング動作を行わせることができる。このた
め、電力損失を低減することが可能で、電磁誘導による
電力伝送を効率的に実行できる。また、駆動回路４の発
振周波数ｆoscは前記式（１）で定まるが、ＭＯＳＦＥ
Ｔ Ｑ１はバイポーラトランジスタに比べ式（１）中の
ΔＹeが極めて小さいので、発振周波数が温度変化に対
し安定で、かつ負荷変動に対しても安定である。(2) Since the MOSFET Q1 which is a field effect transistor is used as the oscillation transistor of the drive circuit 4, it does not require a bias current unlike a bipolar transistor, and is set to a low gate bias voltage of the MOS FET Q1. Therefore, MOS FET Q1
Can perform a switching operation. Therefore, power loss can be reduced, and power transmission by electromagnetic induction can be efficiently performed. Further, the oscillation frequency fosc of the drive circuit 4 is determined by the above equation (1),
Since TQ1 has a much smaller ΔYe in the formula (1) than that of the bipolar transistor, the oscillation frequency is stable with respect to temperature changes and also with respect to load fluctuations.
【００４３】(3) 受電部２において、受電コイルＬ３
とコンデンサＣ６とで発振周波数に等しい共振周波数を
持つ並列共振回路を構成したので、発振波形を波形整形
でき（正弦波に近づけることができ）、スプリアス雑音
を小さくすることができる。(3) In the power receiving section 2, the power receiving coil L3
Since the parallel resonance circuit having a resonance frequency equal to the oscillation frequency is formed by the capacitor C6 and the capacitor C6, the oscillation waveform can be shaped (close to a sine wave) and the spurious noise can be reduced.
【００４４】(4) ＭＯＳ ＦＥＴ Ｑ１のソース側に抵
抗Ｒ３を挿入したことで、容易に発振電力の調整が可能
であり、かつＭＯＳ ＦＥＴ Ｑ１のソース、ドレイン間
電圧のピーク値を低下させてＭＯＳ ＦＥＴ Ｑ１の耐圧
の問題を解消できる。(4) By inserting the resistor R3 on the source side of the MOS FET Q1, the oscillation power can be easily adjusted, and the peak value of the voltage between the source and drain of the MOS FET Q1 can be lowered to reduce the MOS. The problem of withstand voltage of the FET Q1 can be solved.
【００４５】[0045]
【００４６】（５） 送電側電磁誘導コイルＬ１は中央
部２０ａの先端面が周辺部２０ｂよりも一段高くなった
断面凸状Ｎｉ−Ｚｎ系フェライトコア２０に、前記中央
部２０ａを周回するボビンレスの環状巻線２１を設けた
ものであり、受電コイルＬ３との電磁結合を密にすると
ともに、環状巻線２１を中央部２０ａより一段低い周辺
部２０ｂに配置することで小型化することができる。 (5) In the power transmission side electromagnetic induction coil L1, a Ni-Zn ferrite core 20 having a convex cross section in which the front end surface of the central portion 20a is one step higher than the peripheral portion 20b is a bobbin-less coil that surrounds the central portion 20a. Since the annular winding 21 is provided, the electromagnetic coupling with the power receiving coil L3 is made dense, and the annular winding 21 is arranged in the peripheral portion 20b which is one step lower than the central portion 20a, whereby the size can be reduced.
【００４７】なお、受電部側の構成は、用途に応じて適
宜変更でき、電圧安定化回路等を省略することもでき
る。また、受電コイルも、送電側の電磁誘導コイルと同
様の断面凸状Ｎi−Ｚn系フェライトコアに、融着性被覆
導線を巻回して相互に固着してなる環状巻線を設けたボ
ビンレス構造としてもよい。The configuration of the power receiving unit side can be appropriately changed according to the application, and the voltage stabilizing circuit and the like can be omitted. Further, the power receiving coil also has a bobbinless structure in which a Ni-Zn ferrite core having a convex cross section similar to the electromagnetic induction coil on the power transmitting side is provided with an annular winding formed by winding fusible coated conductive wires and fixing them to each other. Good.
【００４８】以上本発明の実施例について説明してきた
が、本発明はこれに限定されることなく請求項の記載の
範囲内において各種の変形、変更が可能なことは当業者
には自明であろう。Although the embodiment of the present invention has been described above, it is obvious to those skilled in the art that the present invention is not limited to this and various modifications and changes can be made within the scope of the claims. Let's do it.
【００４９】[0049]
【発明の効果】以上説明したように、本発明は、電界効
果トランジスタのドレイン、ゲート間に磁束発生用電磁
誘導コイルと直流阻止用の第１のコンデンサとの直列回
路を接続し、ゲート、ソース間に第２のコンデンサを接
続し、ドレイン、ソース間に第３のコンデンサを接続
し、前記ドレイン、ゲート間の誘導性と、前記ゲート、
ソース間及びドレイン、ソース間の容量性とで自励式コ
ルピッツ発振回路を構成しており、簡単で部品点数の少
ない駆動回路の構成によって数１００ｋＨｚ以上の高周
波発振を安定して行うことができる。そして、この駆動
回路で電磁誘導コイルを励磁することにより受電部側の
受電コイルに非接触で電力伝送ができる。As described above, according to the present invention, a series circuit of a magnetic flux generating electromagnetic induction coil and a DC blocking first capacitor is connected between the drain and gate of a field effect transistor, and the gate and source are connected. A second capacitor is connected between them, a third capacitor is connected between the drain and the source, the inductive property between the drain and the gate, and the gate,
A self-excited Colpitts oscillation circuit is configured by the capacitance between the sources and between the drains and the sources, and high frequency oscillation of several 100 kHz or more can be stably performed by the configuration of the driving circuit which is simple and has a small number of components. Then, by exciting the electromagnetic induction coil with this drive circuit, electric power can be transmitted in a non-contact manner to the power receiving coil on the power receiving unit side.
【００５０】また、駆動回路の発振トランジスタとして
の電界効果トランジスタを用い、そのゲートバイアス電
圧を低めに設定してスイッチング動作を行わせること
で、電磁誘導による電力伝送を効率的に実行でき、発熱
を少なくすることができる。Further, by using the field effect transistor as the oscillation transistor of the drive circuit and setting the gate bias voltage thereof to be low to perform the switching operation, the electric power transmission by the electromagnetic induction can be efficiently executed and the heat generation. Can be reduced.
【００５１】さらに、前記第２及び第３のコンデンサの
接続点と前記ソースとの間に抵抗を挿入したことにより
発振電力を容易に調整できるとともにソース、ドレイン
間電圧のピーク値を低下させて前記電界効果トランジス
タの耐圧の問題を解消することができる。Further, by inserting a resistor between the connection point of the second and third capacitors and the source, the oscillating power can be easily adjusted and the peak value of the voltage between the source and the drain can be lowered to reduce the peak value. The problem of breakdown voltage of the field effect transistor can be solved.
【００５２】また、駆動回路の発振周波数を数１００ｋ
Ｈｚ乃至数ＭＨｚ以上の適切な値に設定することで、コ
ードレス電話機等の雑音の影響を極端に嫌う機器の充電
装置として使用した場合に、当該機器に対する高調波雑
音妨害を回避可能である。Further, the oscillation frequency of the drive circuit is set to several 100 k.
By setting an appropriate value of Hz to several MHz or more, when used as a charging device for a device such as a cordless telephone which is extremely disliked by noise, it is possible to avoid harmonic noise interference with the device.
【図１】本発明に係る電磁誘導コイルの駆動回路及び該
駆動回路を用いた充電装置の実施例を示す回路図であ
る。FIG. 1 is a circuit diagram showing an embodiment of a drive circuit of an electromagnetic induction coil and a charging device using the drive circuit according to the present invention.
【図２】実施例の機械的な構造を示す部分断面図であ
る。FIG. 2 is a partial cross-sectional view showing the mechanical structure of the embodiment.
【図３】実施例で用いる駆動回路を内ケースに収納しさ
らにカバーを被せた送電ユニットを示す正面図である。FIG. 3 is a front view showing a power transmission unit in which a drive circuit used in the embodiment is housed in an inner case and further covered with a cover .
【図４】同平面図である。FIG. 4 is a plan view of the same.
【図５】同じくカバーを装着した側からみた斜視図であ
る。FIG. 5 is a perspective view of the same as seen from the side where the cover is mounted.
【図６】実施例で用いる受電コイルの側断面図である。FIG. 6 is a side sectional view of a power receiving coil used in an example.
【図７】同底面図である。FIG. 7 is a bottom view of the same.
【図８】駆動回路の発振トランジスタであるＭＯＳ Ｆ
ＥＴのソース、ドレイン間電圧を示す波形図である。FIG. 8: MOS F which is an oscillation transistor of a drive circuit
It is a wave form diagram which shows the source-drain voltage of ET.
【図９】送電側の電磁誘導コイルに流れる電流を示す波
形図である。FIG. 9 is a waveform diagram showing a current flowing through the electromagnetic induction coil on the power transmission side.
１ 充電部 ２ 受電部 ４ 駆動回路 ５ 一次側整流平滑回路 １１ プリント基板 １３ 内ケース １４ コネクタ １６ カバー ２０，５２ フェライトコア ２０ａ 中央部 ２０ｂ 周辺部 ２１，５３ 環状巻線 ３０ 送電ユニット ３１ 充電部ケース ４０ 受電部ケース ４１ プリント基板 ４２ 電圧安定化回路 ４３ 電流切換回路 ５０ ボビン Ｂ 二次電池 Ｌ１ 電磁誘導コイル Ｌ３ 受電コイル Ｃ１乃至Ｃ７ コンデンサ Ｄ１，Ｄ２ ダイオード ＺＤ 定電圧ダイオード Ｒ１乃至Ｒ６ 抵抗器 Ｑ１ ＭＯＳＦＥＴ Ｑ２，Ｑ３ トランジスタDESCRIPTION OF SYMBOLS 1 Charging part 2 Power receiving part 4 Drive circuit 5 Primary side rectification / smoothing circuit 11 Printed circuit board 13 Inner case 14 Connector 16 Cover 20,52 Ferrite core 20a Central part 20b Peripheral part 21,53 Annular winding 30 Power transmission unit 31 Charging part case 40 Power receiving part 41 Printed circuit board 42 Voltage stabilizing circuit 43 Current switching circuit 50 Bobbin B Secondary battery L1 Electromagnetic induction coil L3 Power receiving coil C1 to C7 Capacitors D1 and D2 Diodes ZD Constant voltage diode R1 to R6 Resistors Q1 MOSFETs Q2 and Q3 Transistor
Claims (5)
ト間に磁束発生用電磁誘導コイルと直流阻止用の第１の
コンデンサとの直列回路を接続し、ゲート、ソース間に
第２のコンデンサを接続し、ドレイン、ソース間に第３
のコンデンサを接続し、前記ドレイン、ゲート間の誘導
性と、前記ゲート、ソース間及びドレイン、ソース間の
容量性とで自励発振回路を構成し、前記第２及び第３の
コンデンサの接続点と前記ソースとの間に抵抗を挿入す
るとともに、前記電界効果トランジスタにスイッチング
動作を行わせることを特徴とする電磁誘導コイルの駆動
回路。1. A series circuit of a magnetic flux generating electromagnetic induction coil and a direct current blocking first capacitor is connected between a drain and a gate of a field effect transistor, and a second capacitor is connected between a gate and a source, Third between drain and source
Capacitor is connected, and a self-excited oscillation circuit is constituted by the inductive property between the drain and the gate and the capacitive property between the gate and the source and between the drain and the source, and the connection point of the second and third capacitors. A drive circuit for an electromagnetic induction coil, wherein a resistance is inserted between the source and the source and the field effect transistor is caused to perform a switching operation.
ＭＨｚ以上に設定されている請求項１記載の電磁誘導コ
イルの駆動回路。2. The oscillation frequency of the self-excited oscillation circuit is 1.1.
The drive circuit for the electromagnetic induction coil according to claim 1, wherein the drive circuit is set to MHz or higher.
ト間に磁束発生用電磁誘導コイルと直流阻止用の第１の
コンデンサとの直列回路を接続し、ゲート、ソース間に
第２のコンデンサを接続し、ドレイン、ソース間に第３
のコンデンサを接続し、前記ドレイン、ゲート間の誘導
性と、前記ゲート、ソース間及びドレイン、ソース間の
容量性とで自励発振回路を構成し、前記第２及び第３の
コンデンサの接続点と前記ソースとの間に抵抗を挿入す
るとともに、前記電界効果トランジスタにスイッチング
動作を行わせる駆動回路を具備し、該駆動回路を充電部
ケース内に設けた充電部と、 前記充電部ケース内に配置された前記磁束発生用電磁誘
導コイルに電磁結合可能な受電コイル及び該受電コイル
の誘起電圧を整流して二次電池に供給する整流回路を受
電部ケース内に配置してなる受電部とを備えたことを特
徴とする充電装置。3. A series circuit of a magnetic flux generating electromagnetic induction coil and a direct current blocking first capacitor is connected between the drain and the gate of the field effect transistor, and a second capacitor is connected between the gate and the source, Third between drain and source
Capacitor is connected, and a self-excited oscillation circuit is constituted by the inductive property between the drain and the gate and the capacitive property between the gate and the source and between the drain and the source, and the connection point of the second and third capacitors. A charging circuit having a driving circuit for inserting a resistor between the source and the source and causing the field effect transistor to perform a switching operation, the charging circuit having the driving circuit provided in a charging unit case, and the charging unit case in the charging unit case. A power receiving coil that is electromagnetically coupled to the magnetic flux generating electromagnetic induction coil that is disposed, and a power receiving unit that rectifies an induced voltage of the power receiving coil and supplies the secondary battery with a rectifying circuit in a power receiving unit case. A charging device characterized by being provided.
周辺部よりも一段高くなった断面凸状フェライトコア
に、前記中央部を周回する環状巻線を設けたものである
請求項３記載の充電装置。4. The electromagnetic induction coil according to claim 3, wherein a ferrite core having a convex cross section in which a front end surface of the central portion is one step higher than a peripheral portion is provided with an annular winding that surrounds the central portion. Charging device.
が接続され、前記受電コイルと第４のコンデンサとで前
記発振回路の発振周波数で共振する共振回路を構成して
いる請求項３又は４記載の充電装置。5. A fourth capacitor is connected to the power receiving coil, and the power receiving coil and the fourth capacitor form a resonance circuit that resonates at an oscillation frequency of the oscillation circuit. Charging device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6329271A JP2673876B2 (en) | 1994-12-05 | 1994-12-05 | Driving circuit for electromagnetic induction coil and charging device using the driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6329271A JP2673876B2 (en) | 1994-12-05 | 1994-12-05 | Driving circuit for electromagnetic induction coil and charging device using the driving circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08163792A JPH08163792A (en) | 1996-06-21 |
| JP2673876B2 true JP2673876B2 (en) | 1997-11-05 |
Family
ID=18219587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6329271A Expired - Fee Related JP2673876B2 (en) | 1994-12-05 | 1994-12-05 | Driving circuit for electromagnetic induction coil and charging device using the driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2673876B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112010000855T5 (en) | 2009-01-08 | 2012-06-21 | Nec Tokin Corp. | Transmitting device of electrical power and non-contact transmission system of electrical power |
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| JP5746049B2 (en) | 2009-12-17 | 2015-07-08 | トヨタ自動車株式会社 | Power receiving device and power transmitting device |
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| EP2751900B1 (en) * | 2011-09-07 | 2021-08-04 | Auckland UniServices Limited | Magnetic field shaping for inductive power transfer |
| JP6049165B2 (en) * | 2011-10-24 | 2016-12-21 | Ｎｅｃトーキン株式会社 | Non-contact power transmission device and electronic device |
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| JP5688549B2 (en) | 2013-04-10 | 2015-03-25 | パナソニック インテレクチュアル プロパティ コーポレーション オブアメリカＰａｎａｓｏｎｉｃ Ｉｎｔｅｌｌｅｃｔｕａｌ Ｐｒｏｐｅｒｔｙ Ｃｏｒｐｏｒａｔｉｏｎ ｏｆ Ａｍｅｒｉｃａ | Coil module and electronic device |
| JP6148552B2 (en) * | 2013-07-02 | 2017-06-14 | 矢崎総業株式会社 | Coil unit |
| JPWO2015063920A1 (en) * | 2013-10-31 | 2017-03-09 | 三菱電機エンジニアリング株式会社 | Resonant type high frequency power supply |
| WO2015097805A1 (en) * | 2013-12-26 | 2015-07-02 | 三菱電機エンジニアリング株式会社 | Automatic matching circuit for high-frequency matching circuit |
| CN105262240A (en) * | 2015-11-06 | 2016-01-20 | 深圳市独尊科技开发有限公司 | Wireless induction power transmission circuit and system |
| JP7122137B2 (en) * | 2018-03-29 | 2022-08-19 | 株式会社Lixil | Electric unit for wireless power supply |
-
1994
- 1994-12-05 JP JP6329271A patent/JP2673876B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112010000855T5 (en) | 2009-01-08 | 2012-06-21 | Nec Tokin Corp. | Transmitting device of electrical power and non-contact transmission system of electrical power |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08163792A (en) | 1996-06-21 |
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