JP2011145928A - Power source control system - Google Patents

Power source control system Download PDF

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JP2011145928A
JP2011145928A JP2010006845A JP2010006845A JP2011145928A JP 2011145928 A JP2011145928 A JP 2011145928A JP 2010006845 A JP2010006845 A JP 2010006845A JP 2010006845 A JP2010006845 A JP 2010006845A JP 2011145928 A JP2011145928 A JP 2011145928A
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power supply
power source
supply unit
voltage
constant current
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Shinya Sakaida
信也 境田
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Sharp Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a power source control system for supplying minimum output voltage to a load device from a power source unit and suppressing wasteful power consumption as much as possible in a power source input/output system for connecting the power source unit and the load device operated by receiving supply of a DC power source by wiring. <P>SOLUTION: LED lighting devices 1, 2, ..., being the load devices are driven with constant current by a constant current circuit 12. A control circuit part 17 transmits a command signal for raising output of the constant voltage circuit 1 to the control circuit part 17 of a power source unit-side via a command transmission/reception circuit part 13 when a determining result shows that a necessary constant current value is not obtained in determination of quality of a power source supply state. The control circuit part 17 raises the output of the constant voltage circuit 1, compensates a voltage drop due to wiring resistors 5 and 6 of a DC power source supply line, supplies the minimum output voltage to the LED lighting devices 1, 2, ..., from the power source unit and suppresses wasteful power consumption. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、電源ユニットとそのＤＣ電源の供給を受けて動作する負荷装置を配線で接続して電源入出力を制御する電源制御システムに関する。   The present invention relates to a power supply control system for controlling power supply input / output by connecting a power supply unit and a load device that operates by receiving the DC power supply by wiring.

従来、電源ユニットとそのＤＣ電源の供給を受けて動作する負荷装置を配線で接続する電源入出力システムに関して、電源ユニットは負荷装置に対して、出力電圧については、予め負荷装置が必要とする最小電圧を調査の上、その最小電圧以上になるように手動で出力電圧を設定することが多かった。   Conventionally, regarding a power input / output system in which a power supply unit and a load device that operates by receiving the DC power supply are connected by wiring, the power supply unit has a minimum output voltage required for the load device in advance. In many cases, after investigating the voltage, the output voltage was manually set to be equal to or higher than the minimum voltage.

一方、出力電圧を自動で設定する例としては、液晶表示装置の面光源電源制御回路がある（特許文献１参照）。面光源電源制御回路は、電源出力電圧より参照電圧を検出し、その参照電圧が必要な最小限の駆動電位以上となるように電源出力電圧を自動制御するものである。こうした電源出力電圧の自動制御は、出力電圧の手動設定を不要化し、また、効率的な電圧値に自動設定することにより消費電力の低減を図るものである。   On the other hand, as an example of automatically setting the output voltage, there is a surface light source power supply control circuit of a liquid crystal display device (see Patent Document 1). The surface light source power supply control circuit detects a reference voltage from the power supply output voltage, and automatically controls the power supply output voltage so that the reference voltage becomes equal to or higher than a necessary minimum driving potential. Such automatic control of the power supply output voltage eliminates the need for manual setting of the output voltage and reduces power consumption by automatically setting the voltage to an efficient voltage value.

電源ユニットとそのＤＣ電源の供給を受けて動作する負荷装置を配線で接続する電源入出力システムに関して、電源ユニットは接続する負荷装置への配線長によって必要な最小出力電圧が異なる。そのため、電源ユニットの出力電圧は予め余裕をもった配線長に対応した電圧となるように設定する必要があり、無駄な消費電力の発生があった。特許文献１に開示されている回路は、内部回路で参照電圧を検出してその結果をフィードバックし、出力電圧を適切な値に自動設定することにより無駄な電力消費を低減するものである。   Regarding a power input / output system in which a power supply unit and a load device that operates by receiving the supply of DC power are connected by wiring, the power supply unit has a different minimum output voltage depending on the wiring length to the load device to be connected. Therefore, the output voltage of the power supply unit needs to be set in advance so as to be a voltage corresponding to the wiring length having a margin, and wasteful power consumption occurs. The circuit disclosed in Patent Document 1 is to reduce useless power consumption by detecting a reference voltage in an internal circuit, feeding back the result, and automatically setting the output voltage to an appropriate value.

また、本出願人は、単一又は複数のＬＥＤが直列に接続されたＬＥＤ群に電力を供給するＬＥＤドライバであって、ＬＥＤ群に直列に定電流回路部を接続して自己に流れる電流を所定値に調整して維持し、定電流回路部に直列に、スイッチングレギュレータによって電圧を調整する電圧調整部を接続して、定電流回路部が負担する電圧降下がより適正状態となるように電圧調整をすることで、定電流回路部の負担を軽減させることを提案している（特許文献２）。   In addition, the present applicant is an LED driver that supplies power to an LED group in which a single or a plurality of LEDs are connected in series, and a constant current circuit unit is connected in series to the LED group to generate a current flowing through the LED driver. A voltage adjustment unit that adjusts and maintains the voltage to a predetermined value and is connected in series with the constant current circuit unit by a switching regulator so that the voltage drop borne by the constant current circuit unit is more appropriate. It has been proposed to reduce the burden on the constant current circuit section by adjusting (Patent Document 2).

特開２００６−１８５９４２号公報JP 2006-185942 A 特開２００８−１３４２８８号公報JP 2008-134288 A

ところで、電源ユニットと負荷装置の間には配線長に応じた電圧降下（以下、「配線長ドロップ」と記す）があり、配線長ドロップとしては電源側配線とＧＮＤ（接地）側配線による電位降下が発生するため、上記特許文献１に記載の参照電圧検出方法では対応できない。その理由は、配線ドロップが電源側のみに存在していてＧＮＤ側では電源ユニットと負荷装置とで共通電位であれば、特許文献１における電圧検出方法で対応できるが、ＧＮＤ側にも配線ドロップが発生する場合には、電源ユニットと負荷装置とがＧＮＤ側で共通電位でなくなるため、対応できなくなるからである。   Incidentally, there is a voltage drop (hereinafter referred to as “wiring length drop”) between the power supply unit and the load device, and the potential drop due to the power supply side wiring and the GND (grounding) side wiring as the wiring length drop. Therefore, the reference voltage detection method described in Patent Document 1 cannot cope with this. The reason is that if the wiring drop exists only on the power supply side and the GND side has a common potential between the power supply unit and the load device, the voltage detection method in Patent Document 1 can cope with it, but there is also a wiring drop on the GND side. This is because, when it occurs, the power supply unit and the load device are not at a common potential on the GND side, and thus cannot be handled.

そこで、電源ユニットとそのＤＣ電源の供給を受けて動作する負荷装置を配線で接続する電源入出力システムにおいて、負荷装置側を定電流駆動しようとする際に必要な定電流値が得られない場合には、そうした事態に自動的に対応して、負荷装置に対して必要最小限の出力電圧を電源ユニットより供給することを可能にする点で解決すべき課題がある。 この発明の目的は、負荷装置側を定電流駆動しようとする際に、無駄な電力消費を極力抑えることを可能にする電源制御システムを提供することである。   Therefore, in a power supply input / output system in which a power supply unit and a load device that operates by receiving the DC power supply are connected by wiring, a constant current value necessary for constant current drive on the load device side cannot be obtained. However, there is a problem to be solved in that it is possible to automatically respond to such a situation and to supply the minimum necessary output voltage to the load device from the power supply unit. An object of the present invention is to provide a power supply control system that can suppress wasteful power consumption as much as possible when the load device side is driven at a constant current.

上記課題に対する解決策として、この発明による電源制御システムは、電源ユニットとそのＤＣ電源の供給を受けて動作する負荷装置を複数の配線で接続する電源入出力システムにおいて、前記負荷装置側は定電流駆動され、必要な定電流値が得られるか否かで電源供給状態の良否を判定し、その判定結果に基づいてＤＣ電源供給ラインの配線による電圧降下を補償した上で、前記負荷装置に対して必要最小限の電圧を前記電源ユニットより供給することを特徴としている。   As a solution to the above problem, a power control system according to the present invention is a power input / output system in which a power supply unit and a load device that operates by receiving the supply of DC power are connected by a plurality of wirings. Whether the power supply state is good or not is determined based on whether or not a required constant current value is obtained, and based on the determination result, a voltage drop due to the wiring of the DC power supply line is compensated for the load device. The minimum necessary voltage is supplied from the power supply unit.

負荷装置側が定電流駆動され、負荷装置側で必要な定電流値が得られるかどうかを見て、必要な定電流値が得られない場合は、電源ユニット側の出力電圧を上げるようにフィードバック制御する。初めは電源ユニットの出力電圧を低めにしておいて、負荷装置側で必要な定電流値が得られるようになるまで、徐々に電源ユニットの出力電圧を上げてゆく。このようにして電源ユニットの出力電圧を設定するようにすれば、必要以上に無駄な消費電力を低減することができる。1 台の電源ユニットに対して複数の負荷装置が接続されている場合は、全ての負荷装置で必要な定電流値が確保されるまで、電源ユニットの出力電圧を上げてゆく。   Feedback control to increase the output voltage on the power supply unit side when the load device side is driven with constant current and the required constant current value is not obtained on the load device side. To do. Initially, the output voltage of the power supply unit is lowered, and the output voltage of the power supply unit is gradually increased until the required constant current value is obtained on the load device side. By setting the output voltage of the power supply unit in this way, it is possible to reduce unnecessary power consumption more than necessary. When multiple load devices are connected to one power supply unit, increase the output voltage of the power supply unit until the necessary constant current value is secured in all load devices.

このような制御を行うためには、電源ユニットと負荷装置の間で制御信号の送受信が必要になる。電源ライン（プラス側とマイナス側）以外に専用の制御ラインを設けてもよいが、制御信号の送受信を電源ラインに重畳すれば、電源ユニットと負荷装置間の配線数を削減でき（複数の負荷装置が接続されている場合でも、電源ユニットと全ての負荷装置の電源ライン（プラス側）を共通に接続し、かつそれらの電源ライン（マイナス側）を共通に接続するような送り配線をすれば（後述の実施例参照）配線は2 本のみで済む）、配線工事が簡便となる。また、前記ＤＣ電源の入出力ラインをハイ・インピーダンスに構成することができる。   In order to perform such control, it is necessary to transmit and receive control signals between the power supply unit and the load device. A dedicated control line may be provided in addition to the power supply line (positive side and negative side), but if transmission and reception of control signals are superimposed on the power supply line, the number of wires between the power supply unit and the load device can be reduced (multiple loads Even if the device is connected, if the power supply unit and the power supply line (positive side) of all load devices are connected in common, and the power supply line (minus side) is connected in common (Refer to the examples described later.) Only two wires are required.) Wiring work is simplified. Further, the input / output line of the DC power source can be configured to have a high impedance.

この発明に係る電源制御システムによれば、電源ユニットとそのＤＣ電源の供給を受けて動作する負荷装置を配線で接続する電源入出力システムに関して、接続する各負荷装置への配線長が異なっても電源ユニットからはシステムとして必要な最小限の電圧を出力するようにして、無駄な消費電力の発生を低減することができる。また、負荷装置側で必要な定電流値が得られないことに応じて当該定電流値が得られるまで電源ユニット側の出力電圧を上昇させるフィードバック制御を行うので、必要以上に無駄な消費電力を低減することができる。更に、こうした電源制御のためには、電源ユニットと負荷装置の間で制御信号の送受信をする必要が生じるが、制御信号の送受信を電源ラインに重畳することで配線数を削減し、配線工事を簡便にすることができる。   According to the power supply control system of the present invention, regarding a power supply input / output system that connects a power supply unit and a load device that operates by receiving supply of DC power by wiring, even if the wiring length to each connected load device is different. By generating the minimum voltage necessary for the system from the power supply unit, it is possible to reduce generation of useless power consumption. In addition, feedback control is performed to increase the output voltage on the power supply unit side until the constant current value is obtained when the required constant current value is not obtained on the load device side. Can be reduced. Furthermore, for such power control, it is necessary to transmit and receive control signals between the power supply unit and the load device. However, by superimposing transmission and reception of control signals on the power supply line, the number of wires can be reduced, and wiring work can be performed. It can be simplified.

本発明による電源制御システムの一例について、電源ユニットの接続構成及び電源ユニット内部の回路構成のブロック図である。It is a block diagram of the connection configuration of a power supply unit and the circuit configuration inside the power supply unit for an example of the power supply control system according to the present invention. 図１におけるＬＥＤ部の回路図の具体例である。It is a specific example of the circuit diagram of the LED part in FIG.

以下、本考案における実施例を図面の記載に基づいて説明する。図１は本実施例に基づく電源ユニットの接続構成及び電源ユニット内部の回路構成のブロック図である。本実施例では1 台の電源ユニットに対してＬＥＤ照明装置１、ＬＥＤ照明装置２、ＬＥＤ照明装置３（ＬＥＤ照明装置１、２と同様の構造であるので詳細を省略）・・の複数の負荷装置が接続されている。電源ユニットは定電圧回路１、制御回路部２、コマンド信号送受信回路部４を備えて構成されている。   Embodiments of the present invention will be described below based on the drawings. FIG. 1 is a block diagram of a connection configuration of a power supply unit and a circuit configuration inside the power supply unit according to this embodiment. In this embodiment, a plurality of loads of LED lighting device 1, LED lighting device 2, LED lighting device 3 (the details are omitted because of the same structure as LED lighting devices 1 and 2) for one power supply unit. The device is connected. The power supply unit includes a constant voltage circuit 1, a control circuit unit 2, and a command signal transmission / reception circuit unit 4.

各ＬＥＤ照明装置は、定電流回路１２、コマンド信号送受信回路部１３、制御回路部１７、ＬＥＤ部１８、及びトランジスタＴＲ２で構成されている。定電流回路１２は、トランジスタＴＲ１、抵抗１４及び１９、ダイオード１５及び２０から構成される。ＴＲ２は、制御回路部１７からのパルス駆動出力を受けて、定電流回路１２からの出力を短時間にＯＮ／ＯＦＦする。ＴＲ２の出力ＯＮ時にはＬＥＤ部１８に電源供給をＯＮし、ＬＥＤ部１８のＬＥＤを点灯させる。ＴＲ２の出力ＯＦＦ時にはＬＥＤ部１８に電源供給をＯＦＦし、ＬＥＤ部１８のＬＥＤを消灯させる。この短時間でのＯＮ時間とＯＦＦ時間の割合を変更するＬＥＤの点灯／消灯動作により、ＬＥＤの明るさを所望の明るさに制御する、即ち調光することが可能となる。   Each LED illumination device includes a constant current circuit 12, a command signal transmission / reception circuit unit 13, a control circuit unit 17, an LED unit 18, and a transistor TR2. The constant current circuit 12 includes a transistor TR1, resistors 14 and 19, and diodes 15 and 20. TR2 receives the pulse drive output from the control circuit unit 17, and turns ON / OFF the output from the constant current circuit 12 in a short time. When the output of TR2 is ON, the power supply to the LED unit 18 is turned ON, and the LED of the LED unit 18 is turned on. When the output of TR2 is OFF, the power supply to the LED unit 18 is turned OFF, and the LED of the LED unit 18 is turned off. By turning on / off the LED for changing the ratio between the ON time and the OFF time in a short time, the brightness of the LED can be controlled to a desired brightness, that is, dimming can be performed.

電源ユニットとＬＥＤ照明装置との間は、配線抵抗で接続される。配線抵抗５と配線抵抗6 はＬＥＤ照明装置１への配線抵抗であり、配線抵抗５は電源ユニットの電源側とＬＥＤ照明装置１の電源側との間の配線抵抗であり、配線抵抗６は電源ユニットのＧＮＤ側とＬＥＤ照明装置１のＧＮＤ側との間の配線抵抗である。配線抵抗７，８、９，１０も同様に、ＬＥＤ照明装置２及びＬＥＤ照明装置３への配線抵抗である。すなわち、配線抵抗７は、ＬＥＤ照明装置１の電源側とＬＥＤ照明装置２の電源側との間の配線抵抗であり、配線抵抗９は、ＬＥＤ照明装置２の電源側とＬＥＤ照明装置３の電源側との間の配線抵抗である。また、配線抵抗８は、ＬＥＤ照明装置１のＧＮＤ側とＬＥＤ照明装置２のＧＮＤ側との間の配線抵抗であり、配線抵抗９は、ＬＥＤ照明装置２のＧＮＤ側とＬＥＤ照明装置３のＧＮＤ側との間の配線抵抗である。   The power supply unit and the LED lighting device are connected by a wiring resistance. The wiring resistance 5 and the wiring resistance 6 are wiring resistances to the LED lighting device 1, the wiring resistance 5 is the wiring resistance between the power source side of the power supply unit and the power source side of the LED lighting device 1, and the wiring resistance 6 is a power source. It is the wiring resistance between the GND side of the unit and the GND side of the LED lighting device 1. Similarly, wiring resistances 7, 8, 9, and 10 are wiring resistances to the LED lighting device 2 and the LED lighting device 3, respectively. That is, the wiring resistance 7 is a wiring resistance between the power source side of the LED lighting device 1 and the power source side of the LED lighting device 2, and the wiring resistance 9 is a power source side of the LED lighting device 2 and the power source of the LED lighting device 3. Wiring resistance between the two sides. The wiring resistance 8 is a wiring resistance between the GND side of the LED lighting device 1 and the GND side of the LED lighting device 2, and the wiring resistance 9 is a GND side of the LED lighting device 2 and the GND of the LED lighting device 3. Wiring resistance between the two sides.

図２は、ＬＥＤ部１８の詳細を示す回路図である。ＬＥＤ１〜ＬＥＤ１６０は照明用ＬＥＤであり、抵抗Ｒ１〜Ｒ２０はＬＥＤの電流制限抵抗である。   FIG. 2 is a circuit diagram showing details of the LED unit 18. LEDs 1 to 160 are illumination LEDs, and resistors R1 to R20 are LED current limiting resistors.

電源ユニット内のコマンド信号送受信回路部４とＬＥＤ照明装置内のコマンド信号送受信回路部１３との間でコマンド信号の送受信を行い、その結果に基づき、電源ユニット内の制御回路部２は定電圧回路１の定電圧出力値を設定する。電源入出力ラインに重畳するコマンド信号は高周波信号（例えば１ＭＨｚＦＳＫ信号）であり、電源回路の低インピーダンス性によってその信号レベルが小さくならないように、コイル３、コイル１１によってコマンド信号に対するインピーダンスを高くしている。定電圧回路１の定電圧値はＬＥＤ照明装置１，２…に必要な定電流値が確保できる最小値が設定され、不必要に高い電圧値を出力して無駄な消費電力を発生させないように制御される。   Command signal transmission / reception is performed between the command signal transmission / reception circuit unit 4 in the power supply unit and the command signal transmission / reception circuit unit 13 in the LED lighting device. Based on the result, the control circuit unit 2 in the power supply unit is a constant voltage circuit. A constant voltage output value of 1 is set. The command signal superimposed on the power input / output line is a high-frequency signal (for example, 1 MHz FSK signal), and the impedance to the command signal is increased by the coils 3 and 11 so that the signal level does not decrease due to the low impedance property of the power circuit. Yes. The constant voltage value of the constant voltage circuit 1 is set to the minimum value that can secure the constant current value necessary for the LED lighting devices 1, 2,..., So that unnecessary power consumption is not generated by outputting an unnecessarily high voltage value. Be controlled.

ＬＥＤ照明装置に必要な定電流値を確保するための最小の定電圧値（電源ユニット内の定電圧回路１の出力）は、次のように設定される。即ち、抵抗１４における電圧ドロップがダイオード１５における電圧ドロップ（≒０．６Ｖ；流れる電流が大きくなると電圧降下も大きくなるが、０．６Ｖまで上昇すると電流が増加しても略一定）と略等しくなるようＴＲ１に定電流が流れる時のＴＲ１の最小コレクタ−エミッタ間電圧（上記の電圧ドロップの関係が成立した後は、電源ユニットの出力電圧を上げても定電流値は変わらずＴＲ１のコレクタ−エミッタ間電圧が上昇する）に、コイル３及び１１、電源側配線抵抗５、ＧＮＤ側配線抵抗６、抵抗１４、ＴＲ２、ＬＥＤ部１８を直列に流れる定電流によって生ずる各電圧値を合計した値に上記の最小の定電圧値は定まる。   The minimum constant voltage value (the output of the constant voltage circuit 1 in the power supply unit) for securing the constant current value necessary for the LED lighting device is set as follows. That is, the voltage drop at the resistor 14 is substantially equal to the voltage drop at the diode 15 (≈0.6 V; the voltage drop increases as the flowing current increases, but increases to 0.6 V and is substantially constant even if the current increases). TR1 minimum collector-emitter voltage when a constant current flows through TR1 (After the above voltage drop relationship is established, the constant-current value does not change even if the output voltage of the power supply unit is increased. The voltage value generated by the constant current flowing in series through the coils 3 and 11, the power supply side wiring resistance 5, the GND side wiring resistance 6, the resistance 14, TR2, and the LED unit 18 is added to the above value. The minimum constant voltage value is determined.

電源ユニットとＬＥＤ照明装置の接続当初においては、定電圧出力は、やや低めに設定されており、必要な定電流値が確保できるまで、コマンド信号の送受信により徐々に上昇させる。ＬＥＤ照明装置内の制御回路部１７は、抵抗１４における電圧ドロップとダイオード１５における電圧ドロップの差がある規定範囲内に入るまで、電源ユニット内の定電圧回路１の定電圧出力を上昇させるように、コマンド信号の送受信を行うようコマンド信号送受信回路部１３に指示する。   At the beginning of the connection between the power supply unit and the LED lighting device, the constant voltage output is set slightly lower, and is gradually increased by transmission / reception of a command signal until a necessary constant current value can be secured. The control circuit unit 17 in the LED lighting device increases the constant voltage output of the constant voltage circuit 1 in the power supply unit until the difference between the voltage drop in the resistor 14 and the voltage drop in the diode 15 falls within a specified range. The command signal transmission / reception circuit unit 13 is instructed to transmit / receive the command signal.

即ち、制御回路部１７への電流値検出入力において、抵抗１４に流れる電流による電圧ドロップがダイオード１５における電圧ドロップ（≒０．６Ｖ）より小さい場合は、制御回路部１７はコマンド送受信回路部１３を制御し、コマンド送受信回路部１３から電源ユニット側のコマンド送受信回路４に対し、定電圧回路１の出力を上昇させるためのコマンド信号を送信する。定電圧回路１の出力を上昇させても、抵抗１４に流れる電流による電圧ドロップがダイオード１５における電圧ドロップ（≒０．６Ｖ）より小さい場合は、更に定電圧回路１の出力を上昇させるためのコマンドを送信する。このコマンド送信と定電圧回路１の出力上昇を抵抗１４に流れる電流による電圧ドロップがダイオード１５における電圧ドロップ（≒０．６Ｖ ）と略等しくなるまで繰り返す。   That is, in the current value detection input to the control circuit unit 17, when the voltage drop due to the current flowing through the resistor 14 is smaller than the voltage drop (≈0.6 V) in the diode 15, the control circuit unit 17 switches the command transmission / reception circuit unit 13. The command transmission / reception circuit unit 13 transmits a command signal for increasing the output of the constant voltage circuit 1 to the command transmission / reception circuit 4 on the power supply unit side. If the voltage drop due to the current flowing through the resistor 14 is smaller than the voltage drop (≈0.6 V) in the diode 15 even if the output of the constant voltage circuit 1 is increased, a command for further increasing the output of the constant voltage circuit 1 Send. This command transmission and the output increase of the constant voltage circuit 1 are repeated until the voltage drop due to the current flowing through the resistor 14 becomes substantially equal to the voltage drop (≈0.6 V) in the diode 15.

このようにすれば、電源ユニットとＬＥＤ照明装置間には配線抵抗５，６があるが、配線抵抗による電圧降下を加味した上で、最小の電源ユニットの定電圧出力が設定されることになる。また、電源ユニット１台に対して、複数のＬＥＤ照明装置が接続される場合でも、配線抵抗の最も高い箇所の電圧降下を加味した上で、最小の電源ユニットの定電圧出力を設定することになる。即ち、ＬＥＤ照明装置１に対して配線抵抗５，６があり、ＬＥＤ照明装置２に対して配線抵抗５，６に加えて配線抵抗７，８があり、ＬＥＤ照明装置２への総合配線抵抗の方が高いので、ＬＥＤ照明装置２への配線抵抗５，６に加えて配線抵抗７，８での電圧降下を加味して、電源ユニットの定電圧回路１の出力が設定され、ＬＥＤ照明装置２に対して必要最小限の電圧が入力されることになる。この場合、ＬＥＤ照明装置１に対しては高めの電圧が入力されるが、その余分の消費電力は定電流回路１２で消費される。   In this way, there are wiring resistances 5 and 6 between the power supply unit and the LED lighting device, but the minimum constant voltage output of the power supply unit is set in consideration of the voltage drop due to the wiring resistance. . In addition, even when a plurality of LED lighting devices are connected to one power supply unit, the constant voltage output of the minimum power supply unit is set after taking into account the voltage drop at the location with the highest wiring resistance. Become. That is, there are wiring resistances 5 and 6 for the LED lighting device 1, wiring resistances 7 and 8 are provided in addition to the wiring resistances 5 and 6 for the LED lighting device 2, and the total wiring resistance to the LED lighting device 2 is Therefore, the output of the constant voltage circuit 1 of the power supply unit is set in consideration of the voltage drop at the wiring resistors 7 and 8 in addition to the wiring resistors 5 and 6 to the LED lighting device 2. Therefore, the minimum necessary voltage is input. In this case, a higher voltage is input to the LED lighting device 1, but the extra power consumption is consumed by the constant current circuit 12.

上記の説明において、ＬＥＤ部１８は一般的な負荷回路部に置き換えてもよい。それにしたがって、ＬＥＤ照明装置は、一般的な負荷装置に置き換えることもできる。   In the above description, the LED unit 18 may be replaced with a general load circuit unit. Accordingly, the LED lighting device can be replaced with a general load device.

１ 定電圧回路 ２ 制御回路部
３ コイル ４ コマンド送受信回路部
５，６，７，８，９，１０ 配線抵抗
１１ コイル １２ 定電流回路
１３ コマンド送受信回路部 １４ 抵抗
１５，２０ ダイオード
１８ ＬＥＤ部 １９ 抵抗
ＴＲ１；ＴＲ２ トランジスタ DESCRIPTION OF SYMBOLS 1 Constant voltage circuit 2 Control circuit part 3 Coil 4 Command transmission / reception circuit part 5, 6, 7, 8, 9, 10 Wiring resistance 11 Coil 12 Constant current circuit 13 Command transmission / reception circuit part 14 Resistance 15, 20 Diode 18 LED part 19 Resistance TR1; TR2 transistor

Claims (5)

電源ユニットとそのＤＣ電源の供給を受けて動作する負荷装置を配線で接続する電源入出力システムにおいて、前記負荷装置側は定電流駆動され、必要な定電流値が得られるか否かで電源供給状態の良否を判定し、その判定結果に基づいて前記負荷装置に対して必要最小限の出力電圧を前記電源ユニットより供給することを特徴とする電源制御システム。   In a power supply input / output system in which a power supply unit and a load device that operates by receiving the DC power supply are connected by wiring, the load device side is driven at a constant current, and power is supplied depending on whether or not a necessary constant current value is obtained. A power supply control system characterized by determining whether the state is good or not and supplying the minimum necessary output voltage from the power supply unit to the load device based on the determination result. 前記負荷装置側で前記必要な定電流値が得られていないことに応答して、前記必要な定電流値が得られるまで前記電源ユニットの前記出力電圧を上昇させる制御を行うことを特徴とする請求項１に記載の電源制御システム。   In response to the fact that the required constant current value is not obtained on the load device side, control is performed to increase the output voltage of the power supply unit until the necessary constant current value is obtained. The power supply control system according to claim 1. 前記電源ユニット１台に対し複数の前記負荷装置を接続可能としており、全ての前記負荷装置で前記必要な定電流値が確保されるまで、前記電源ユニットの前記出力電圧を上昇させる制御を行うことを特徴とする請求項２に記載の電源制御システム。   A plurality of load devices can be connected to one power supply unit, and control is performed to increase the output voltage of the power supply unit until the necessary constant current value is secured in all the load devices. The power supply control system according to claim 2. 制御信号を前記ＤＣ電源上に重畳させて前記電源ユニットと前記負荷装置間で通信することにより、前記負荷装置側からの要求に応じて前記電源ユニットの前記出力電圧を制御することを特徴とする請求項１〜３のいずれか一項に記載の電源制御システム。   The output voltage of the power supply unit is controlled according to a request from the load device side by superimposing a control signal on the DC power supply and communicating between the power supply unit and the load device. The power supply control system as described in any one of Claims 1-3. 前記ＤＣ電源の入出力ラインをハイ・インピーダンスに構成したことを特徴とする請求項４に記載の電源制御システム。   5. The power supply control system according to claim 4, wherein the input / output line of the DC power supply is configured to have a high impedance.
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