JP2015023766A - Power supply switching circuit - Google Patents

Power supply switching circuit Download PDF

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JP2015023766A
JP2015023766A JP2013152873A JP2013152873A JP2015023766A JP 2015023766 A JP2015023766 A JP 2015023766A JP 2013152873 A JP2013152873 A JP 2013152873A JP 2013152873 A JP2013152873 A JP 2013152873A JP 2015023766 A JP2015023766 A JP 2015023766A
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power
power supply
load
converter
switching circuit
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佐江 竹中
Sae Takenaka
佐江 竹中
金井　康通
Yasumichi Kanai
康通 金井
忠利 馬場崎
Tadatoshi Babasaki
忠利 馬場崎
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Nippon Telegraph and Telephone Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a power supply switching circuit capable of selecting a power supply for supplying power to a load regardless of the magnitude of the power supply voltage of an input power supply.SOLUTION: In a power supply switching circuit for switching a plurality of DC power supplies for supplying power to a load, a plurality of power lines to which an input from at least one of the plurality of DC power supplies is connected are connected via a branch part to the load, and the plurality of power lines are respectively provided with a DC/DC converter capable of changing an output voltage and a rectifier element configured to allow currents to flow from the DC/DC converter to the branch part. The output voltage of each of the plurality of DC/DC converters disposed at the plurality of power lines is adjusted such that the priority order of the DC power supply for supplying power to the load is set. The output voltage of the DC/DC converter disposed in the power line connected to the DC power supply whose priority order is high among the plurality of DC/DC converters is made higher than the output voltage of each of the other DC/DC converters such that the DC power supply for supplying power to the load is selected.

Description

本発明は、電力を供給する電源の切替を行う電源切替回路に関する。   The present invention relates to a power supply switching circuit that switches a power supply that supplies electric power.

従来の電子機器には、電圧が変動する電力を対象とした電源回路を有するものがあった。このような電子機器には、複数の電源回路から入力が可能な構成とされ、電源電圧に応じて入力電源を切り替える電源切替回路を有しているものがある。例えば、電源電圧に応じて入力電源を切り替える電源切替回路で、主電源ラインと補助電源ラインとダイオードとを備え、電源電圧に応じて電源の供給元である主電源ラインと補助電源ラインとを切り替える電源切替回路が知られている。   Some conventional electronic devices have a power supply circuit for power whose voltage fluctuates. Some of such electronic devices have a configuration capable of inputting from a plurality of power supply circuits and have a power supply switching circuit that switches input power according to a power supply voltage. For example, a power supply switching circuit that switches input power according to the power supply voltage, and includes a main power supply line, an auxiliary power supply line, and a diode, and switches between the main power supply line and the auxiliary power supply line, which are power supply sources, according to the power supply voltage. A power supply switching circuit is known.

特開２００５−３１２２１８号公報Japanese Patent Laid-Open No. 2005-31218

しかしながら、上記のような電源切替回路は、電源の供給元が入力電源の電源電圧の大小関係に依存するため、常に電源電圧の高い方が優先的に電源の供給元となり、電源電圧の低い方の入力電源の優先順位を任意につけることが出来なかった。   However, in the power supply switching circuit as described above, since the power supply source depends on the magnitude relationship of the power supply voltage of the input power supply, the higher power supply voltage is always preferentially the power supply source, and the lower power supply voltage is It was not possible to arbitrarily prioritize the input power.

本発明は上記従来の問題に鑑みてなされたものであり、本発明の課題は、入力電源の電源電圧の大小関係に関係なく、負荷に電力を供給する電源を選択することができる電源切替回路を提供することにある。   The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a power supply switching circuit capable of selecting a power supply that supplies power to a load regardless of the power supply voltage level of the input power supply. Is to provide.

上記の課題を解決するために、一実施形態に記載の発明は、負荷に電力を供給する複数の直流電源を切り替える電源切替回路において、前記負荷に電力を供給する電力線が電源に接続される複数の電力線に分岐される分岐のうち、負荷に直接接続されている電力線が接続されている分岐におけるすべての電源側配線の分岐近傍に、電源から負荷に電流が流れるようにダイオードを配置し、該ダイオードの電源側近傍に出力電圧の変更が可能なＤＣ／ＤＣコンバータを配置し、前記複数のＤＣ／ＤＣコンバータの出力電圧を調整することにより、前記負荷に供給する前記直流電源の優先順位を設定することを特徴とする電源切替回路である。   In order to solve the above-described problem, the invention described in an embodiment is a power supply switching circuit that switches a plurality of DC power supplies that supply power to a load. A plurality of power lines that supply power to the load are connected to a power supply. A diode is arranged in the vicinity of all the power supply side wiring branches in the branch to which the power line directly connected to the load is connected among the branches branched to the power line, so that a current flows from the power source to the load. A DC / DC converter capable of changing the output voltage is arranged near the power supply side of the diode, and the priority order of the DC power supply to be supplied to the load is set by adjusting the output voltage of the plurality of DC / DC converters. This is a power supply switching circuit.

本発明に係る電源切替回路の構成を表す回路図である。It is a circuit diagram showing the structure of the power supply switching circuit which concerns on this invention. 本発明に係る電源切替回路の構成を表す回路図で、第１の実施形態を示す回路図である。1 is a circuit diagram illustrating a configuration of a power supply switching circuit according to the present invention, and is a circuit diagram illustrating a first embodiment. FIG. 本発明に係る電源切替回路の構成を表す回路図で、第２の実施形態を示す回路図である。It is a circuit diagram showing the structure of the power supply switching circuit which concerns on this invention, and is a circuit diagram which shows 2nd Embodiment.

以下、本発明の実施の形態について、詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail.

本実施形態の電源切替回路は、負荷に電力を供給する複数の直流電源を切り替える電源切替回路において、前記複数の直流電源のうちの少なくとも１つからの入力がそれぞれ接続された複数の電力線を、分岐部を介して前記負荷に接続し、前記複数の電力線は、出力電圧の変更が可能なＤＣ／ＤＣコンバータと該ＤＣ／ＤＣコンバータから前記分岐部に電流が流れるように構成した整流素子とをそれぞれ有し、前記複数の電力線のそれぞれに設けられた複数のＤＣ／ＤＣコンバータの出力電圧を調整することにより、負荷に供給する直流電源の優先順位を設定する。複数のＤＣ／ＤＣコンバータのうち、優先順位の高い直流電源に接続された電力線に設けられたＤＣ／ＤＣコンバータの出力電圧を他のＤＣ／ＤＣコンバータの出力電圧よりも高くすることにより、負荷に電力を供給する電源を選択する。   The power supply switching circuit of the present embodiment is a power supply switching circuit that switches a plurality of DC power supplies that supply power to a load, and a plurality of power lines to which inputs from at least one of the plurality of DC power supplies are respectively connected, The plurality of power lines are connected to the load via a branch unit, and the plurality of power lines include a DC / DC converter capable of changing an output voltage and a rectifying element configured to allow a current to flow from the DC / DC converter to the branch unit. The priority order of the DC power supplies to be supplied to the load is set by adjusting the output voltages of the plurality of DC / DC converters provided in the respective power lines. Among a plurality of DC / DC converters, by making the output voltage of a DC / DC converter provided on a power line connected to a DC power supply with high priority higher than the output voltage of other DC / DC converters, Select a power supply to supply power.

従来の電源切替回路では、負荷に電力を供給する電力線に電源からの複数の電力線を接続する際に、電源から負荷に向かってのみ電流が流れるようにダイオードを配置し、複数の電源の内、電圧のより高い電源の電力のみを負荷に供給する回路が知られていた。しかし、電源電圧により電力を供給する電源が自動的に決まってしまい、電源電圧にかかわらず希望する電源から電力を供給することができないという問題があった。   In a conventional power supply switching circuit, when connecting a plurality of power lines from a power source to a power line that supplies power to a load, a diode is arranged so that a current flows only from the power source toward the load. There has been known a circuit that supplies only a power source having a higher voltage to a load. However, the power source that supplies power is automatically determined by the power source voltage, and there is a problem that power cannot be supplied from the desired power source regardless of the power source voltage.

本実施形態による電源切替回路においては、負荷に電力を供給する複数の直流電源を切り替える電源切替回路において、負荷に電力を供給する電力線が電源に接続される複数の電力線に分岐される分岐のうち、最も負荷に近い分岐におけるすべての電源側配線の分岐近傍に、電源から負荷に電流が流れるようにダイオードを配置し、更にすべてのダイオードの電源側近傍に出力電圧の変更が可能なＤＣ／ＤＣコンバータを配置する。これにより、電力を供給したい電源に接続されたＤＣ／ＤＣコンバータの出力電圧を他のＤＣ／ＤＣコンバータの出力電圧よりも高くすることで、電源電圧にかかわらずに負荷に電力を供給する電源を選択することが可能となり、複数の電源が接続された電力系においてより自由に電源を選択することができる。   In the power supply switching circuit according to the present embodiment, in the power supply switching circuit that switches a plurality of DC power supplies that supply power to the load, a power line that supplies power to the load is divided into a plurality of power lines that are connected to the power supply. DC / DC in which a diode is arranged near the branch of all power supply side wirings in the branch closest to the load so that current flows from the power supply to the load, and the output voltage can be changed near the power supply side of all the diodes Place the converter. As a result, by setting the output voltage of the DC / DC converter connected to the power supply to which power is desired to be higher than the output voltage of other DC / DC converters, the power supply that supplies power to the load regardless of the power supply voltage can be obtained. The power source can be selected, and the power source can be selected more freely in the power system to which a plurality of power sources are connected.

図１は電源切替回路の回路構成の一例を示す図である。図１において、電源１１、１２と、ＤＣ／ＤＣコンバータ１３、１４と、負荷１５と、ＤＣ／ＤＣコンバータ側をアノード端子で接続する整流素子１６、１７とを設けて、整流素子１６と整流素子１７とのカソード端子同士を接続して負荷１５に接続して構成されている。この回路において、ＤＣ／ＤＣコンバータ１３、１４の出力電圧を任意に設定することで、負荷に供給する電源の優先順位を任意に決めて入力電源を切り替えることができる。なお、入力電源の数は限定しない。   FIG. 1 is a diagram illustrating an example of a circuit configuration of a power supply switching circuit. In FIG. 1, power sources 11 and 12, DC / DC converters 13 and 14, a load 15, and rectifier elements 16 and 17 that connect the DC / DC converter side with an anode terminal are provided. 17 is connected to the load 15 by connecting the cathode terminals to the load 15. In this circuit, by arbitrarily setting the output voltages of the DC / DC converters 13 and 14, it is possible to arbitrarily determine the priority order of the power supplies to be supplied to the load and switch the input power supply. The number of input power supplies is not limited.

（第１の実施形態）
太陽光発電と蓄電池とＡＣアダプタの３電源を入力電源とした第１の実施形態について説明する。 (First embodiment)
A first embodiment will be described in which three power sources of solar power generation, a storage battery, and an AC adapter are input power sources.

図２は、第１の実施形態の電源切替回路の回路構成を示す図である。電源切替回路は、太陽光発電２１と、蓄電池２２と、ＡＣアダプタ２３を電源とし、太陽光発電２１に接続したＤＣ／ＤＣコンバータ２４と、蓄電池２２に接続したＤＣ／ＤＣコンバータ２５と、ＡＣアダプタ２３に接続したＤＣ／ＤＣコンバータ２６と、アノード端子をＤＣ／ＤＣコンバータ２４に接続したダイオード２７と、アノード端子をＤＣ／ＤＣコンバータ２５に接続したダイオード２８と、アノード端子をＤＣ／ＤＣコンバータ２６に接続したダイオード２９と、ダイオード２７、２８、２９のカソード端子同士を負荷２０に接続する構成を備えている。   FIG. 2 is a diagram illustrating a circuit configuration of the power supply switching circuit according to the first embodiment. The power supply switching circuit uses a photovoltaic power generation 21, a storage battery 22, and an AC adapter 23 as a power source, a DC / DC converter 24 connected to the photovoltaic power generation 21, a DC / DC converter 25 connected to the storage battery 22, and an AC adapter. 23, a DC / DC converter 26 connected to 23, a diode 27 whose anode terminal is connected to the DC / DC converter 24, a diode 28 whose anode terminal is connected to the DC / DC converter 25, and an anode terminal to the DC / DC converter 26. The connected diode 29 and the cathode terminals of the diodes 27, 28, 29 are connected to the load 20.

図２に示す電源切替回路において、太陽光発電２１と蓄電池２２とＡＣアダプタ２３の電源電圧が、それぞれ３０Ｖ、２０Ｖ、１０Ｖ、ＤＣ／ＤＣコンバータ２４、２５、２６の出力電圧が、それぞれ１Ｖ、２Ｖ、３Ｖと設定したと仮定する。   In the power supply switching circuit shown in FIG. 2, the power supply voltages of the photovoltaic power generation 21, the storage battery 22, and the AC adapter 23 are 30V, 20V, and 10V, respectively, and the output voltages of the DC / DC converters 24, 25, and 26 are 1V and 2V, respectively. Assume that 3V is set.

上記条件では、入力電源の出力電圧の大きさは、太陽光発電２１の電圧＞蓄電池２２の電圧＞ＡＣアダプタ２３の電圧となっている。しかし、ＤＣ／ＤＣコンバータの出力電圧の大きさは、ＤＣ／ＤＣコンバータ２６の電圧＞ＤＣ／ＤＣコンバータ２５の電圧＞ＤＣ／ＤＣコンバータ２４の電圧であるため、入力電源の電圧の大小に依存せず、常に入力電源の優先順位は、ＡＣアダプタ２３、蓄電池２２、太陽光発電２１の順になる。すなわち、全ての電源から出力されている場合は、その電源の出力電圧の大小にかかわらずＡＣアダプタ２３の出力が最も優先的に負荷２０に接続される。ＡＣアダプタ２３が切断された場合には、蓄電池２２の出力が負荷２０に接続される。さらにＡＣアダプタ２３に加えて蓄電池２２も切断された場合は、太陽光発電２１の出力が負荷２０に接続される。このように、ＤＣ／ＤＣコンバータの出力電圧を調整することによって、入力電圧の大小に依存せず、負荷に接続される入力電源の優先順位を設定することができる。   Under the above conditions, the magnitude of the output voltage of the input power supply is the voltage of the photovoltaic power generation 21> the voltage of the storage battery 22> the voltage of the AC adapter 23. However, since the magnitude of the output voltage of the DC / DC converter is the voltage of the DC / DC converter 26> the voltage of the DC / DC converter 25> the voltage of the DC / DC converter 24, it depends on the magnitude of the voltage of the input power supply. Instead, the priority order of the input power supply is always the order of the AC adapter 23, the storage battery 22, and the solar power generation 21. That is, when output is from all power supplies, the output of the AC adapter 23 is connected to the load 20 with the highest priority regardless of the output voltage of the power supply. When the AC adapter 23 is disconnected, the output of the storage battery 22 is connected to the load 20. Further, when the storage battery 22 is also disconnected in addition to the AC adapter 23, the output of the photovoltaic power generation 21 is connected to the load 20. Thus, by adjusting the output voltage of the DC / DC converter, it is possible to set the priority of the input power source connected to the load without depending on the magnitude of the input voltage.

また、複数の電源導入時の運転モードを任意に設定できるという利点もある。すなわち、入力電源の出力電圧の大きさに依存せずＤＣ／ＤＣコンバータの設定次第で、ＡＣアダプタ＞蓄電池＞太陽光発電の優先順位に設定した商用電源優先モードや、太陽光発電＞ＡＣアダプタ＞蓄電池の優先順位に設定した太陽光優先モード（省エネ）などに設定することができ、複数の電源が分散配置された電力系において、より自由に電源を選択することができる。   There is also an advantage that the operation mode at the time of introducing a plurality of power supplies can be arbitrarily set. That is, depending on the setting of the DC / DC converter without depending on the magnitude of the output voltage of the input power supply, depending on the setting of the AC adapter> storage battery> solar power generation priority mode or photovoltaic power generation> AC adapter> It can be set to the solar power priority mode (energy saving) or the like set to the priority order of the storage battery, and the power source can be selected more freely in the power system in which a plurality of power sources are distributed.

（第２の実施形態）
次に、第２の実施形態について説明する。第２の実施形態は、太陽光発電と蓄電池とＡＣアダプタの３電源を本システムの入力電源とし、外部条件によって電源の供給元が変わることで、任意に設定した優先順位の通りにシステムが運転する構成である。 (Second Embodiment)
Next, a second embodiment will be described. In the second embodiment, three power sources of photovoltaic power generation, a storage battery, and an AC adapter are used as input power sources of this system, and the power source is changed according to external conditions. It is the structure to do.

図３は、本発明の第２の実施形態に係る実施の形態を示す図である。電源切替回路は、太陽光発電３１と、蓄電池３２と、ＡＣアダプタ３３を電源とし、アノード端子を太陽光発電３１に接続したダイオード３４と、アノード端子をＡＣアダプタ３３に接続したダイオード３５と、ダイオード３４とダイオード３５のカソード端子を接続したＤＣ／ＤＣコンバータ３６と、蓄電池３２に接続したＤＣ／ＤＣコンバータ３７と、アノード端子をＤＣ／ＤＣコンバータ３６の出力に接続したダイオード３８と、アノード端子をＤＣ／ＤＣコンバータ３７の出力に接続したダイオード３９と、ダイオード３８と３９のカソード端子を負荷３０に接続して構成される。図３に示す電源切替回路を用いて、ＤＣ／ＤＣコンバータの出力電圧を任意に設定することで以下の条件の動作を行うことができる。   FIG. 3 is a diagram showing an embodiment according to the second embodiment of the present invention. The power supply switching circuit includes a photovoltaic power generation 31, a storage battery 32, and an AC adapter 33 as a power source, a diode 34 having an anode terminal connected to the photovoltaic power generation 31, a diode 35 having an anode terminal connected to the AC adapter 33, and a diode. 34 and a cathode terminal of a diode 35, a DC / DC converter 36 connected to the storage battery 32, a diode 38 having an anode terminal connected to the output of the DC / DC converter 36, and a DC terminal DC connected to the output of the DC / DC converter 36. A diode 39 connected to the output of the DC converter 37, and cathode terminals of the diodes 38 and 39 are connected to a load 30. The operation under the following conditions can be performed by arbitrarily setting the output voltage of the DC / DC converter using the power supply switching circuit shown in FIG.

（１）ＤＣ／ＤＣコンバータ３６の出力電圧がＤＣ／ＤＣコンバータ３７の出力電圧よりも高い場合
（１−１）太陽光発電３１の電源電圧がＡＣアダプタ３３の電源電圧より高いとき：
太陽光発電３１の電源電圧がＡＣアダプタ３３の電源電圧より高いので、ダイオード３４の出力がダイオード３５の出力よりも優先される。また、ＤＣ／ＤＣコンバータ３６の出力電圧がＤＣ／ＤＣコンバータ３７の出力電圧よりも高いのでダイオード３８の出力がダイオード３９の出力より優先されるため、太陽光発電３１が負荷３０の消費電力を賄うこととなる。 (1) When the output voltage of the DC / DC converter 36 is higher than the output voltage of the DC / DC converter 37 (1-1) When the power supply voltage of the photovoltaic power generation 31 is higher than the power supply voltage of the AC adapter 33:
Since the power supply voltage of the photovoltaic power generation 31 is higher than the power supply voltage of the AC adapter 33, the output of the diode 34 has priority over the output of the diode 35. Further, since the output voltage of the DC / DC converter 36 is higher than the output voltage of the DC / DC converter 37, the output of the diode 38 is prioritized over the output of the diode 39, so that the photovoltaic power generation 31 covers the power consumption of the load 30. It will be.

（１−２）太陽光発電３１の電源電圧とＡＣアダプタ３３の電源電圧とが等しいとき：
太陽光発電３１の電源電圧とＡＣアダプタ３３の電源電圧が等しいので、ダイオード３４の出力とダイオード３５の出力との両方が出力される。また、ＤＣ／ＤＣコンバータ３６の出力電圧がＤＣ／ＤＣコンバータ３７の出力電圧よりも高いのでダイオード３８の出力がダイオード３９の出力より優先されるため、太陽光発電３１およびＡＣアダプタ３３が負荷３０の消費電力を賄うこととなる。 (1-2) When the power supply voltage of the photovoltaic power generation 31 and the power supply voltage of the AC adapter 33 are equal:
Since the power supply voltage of the photovoltaic power generation 31 and the power supply voltage of the AC adapter 33 are equal, both the output of the diode 34 and the output of the diode 35 are output. Further, since the output voltage of the DC / DC converter 36 is higher than the output voltage of the DC / DC converter 37, the output of the diode 38 is prioritized over the output of the diode 39, so that the photovoltaic power generation 31 and the AC adapter 33 are connected to the load 30. It will cover power consumption.

（１−３）ＡＣアダプタ３３の電源電圧が太陽光発電３１の電源電圧より高いとき：
ＡＣアダプタ３３の電源電圧が太陽光発電３１の電源電圧より高いので、ダイオード３５の出力がダイオード３４の出力よりも優先される。また、ＤＣ／ＤＣコンバータ３６の出力電圧がＤＣ／ＤＣコンバータ３７の出力電圧よりも高いのでダイオード３８の出力がダイオード３９の出力より優先されるため、ＡＣアダプタ３３が負荷３０の消費電力を賄うこととなる。 (1-3) When the power supply voltage of the AC adapter 33 is higher than the power supply voltage of the photovoltaic power generation 31:
Since the power supply voltage of the AC adapter 33 is higher than the power supply voltage of the photovoltaic power generation 31, the output of the diode 35 has priority over the output of the diode 34. In addition, since the output voltage of the DC / DC converter 36 is higher than the output voltage of the DC / DC converter 37, the output of the diode 38 is given priority over the output of the diode 39, so that the AC adapter 33 covers the power consumption of the load 30. It becomes.

（１−４）太陽光発電３１が遮断され、かつＡＣアダプタ３３からは出力されているとき：
ＤＣ／ＤＣコンバータ３６の出力電圧がＤＣ／ＤＣコンバータ３７の出力電圧よりも高いのでダイオード３８の出力がダイオード３９の出力より優先されるため、ＡＣアダプタ３３が負荷３０の消費電力を賄うこととなる。 (1-4) When the photovoltaic power generation 31 is shut off and output from the AC adapter 33:
Since the output voltage of the DC / DC converter 36 is higher than the output voltage of the DC / DC converter 37, the output of the diode 38 is prioritized over the output of the diode 39, so the AC adapter 33 covers the power consumption of the load 30. .

ＡＣアダプタ３３が遮断され、かつ太陽光発電３１からは出力されているとき：
ＤＣ／ＤＣコンバータ３６の出力電圧がＤＣ／ＤＣコンバータ３７の出力電圧よりも高いのでダイオード３８の出力がダイオード３９の出力より優先されるため、太陽光発電３１が負荷３０の消費電力を賄うこととなる。 When the AC adapter 33 is shut off and output from the photovoltaic power generation 31:
Since the output voltage of the DC / DC converter 36 is higher than the output voltage of the DC / DC converter 37, the output of the diode 38 is prioritized over the output of the diode 39, so that the photovoltaic power generation 31 covers the power consumption of the load 30. Become.

（２）ＤＣ／ＤＣコンバータ３７の出力電圧がＤＣ／ＤＣコンバータ３６の出力電圧よりも高い場合 (2) When the output voltage of the DC / DC converter 37 is higher than the output voltage of the DC / DC converter 36

ＤＣ／ＤＣコンバータ３７の出力電圧がＤＣ／ＤＣコンバータ３６の出力電圧よりも高いのでダイオード３９の出力がダイオード３８の出力より優先されるため、蓄電池３２が負荷３０の消費電力を賄うこととなる。   Since the output voltage of the DC / DC converter 37 is higher than the output voltage of the DC / DC converter 36, the output of the diode 39 has priority over the output of the diode 38, so the storage battery 32 covers the power consumption of the load 30.

したがって、第２の実施形態により、供給電源の優先順位を高い方から順にＡＣアダプタ、太陽光発電、蓄電池となる系を実現することができ、負荷に供給する電源の優先順位を任意に設定できる。   Therefore, according to the second embodiment, it is possible to realize a system that becomes an AC adapter, solar power generation, and storage battery in order from the highest power supply priority, and arbitrarily set the power supply priority to the load. .

本発明の電源切替回路は、本実施例に限定されることなく、さらに複数の電源を追加しても同様の切替機能を実現することができる。   The power supply switching circuit of the present invention is not limited to this embodiment, and a similar switching function can be realized even if a plurality of power supplies are added.

１１、１２ 電源
１３、１４、２４、２５、２６、３６、３７ ＤＣ／ＤＣコンバータ
１５、２０、３０ 負荷
１６、１７ 整流素子
２１、３１ 太陽光発電
２２、３２ 蓄電池
２３、３３ ＡＣアダプタ
２７、２８、２９、３４、３５、３８、３９ ダイオード 11, 12 Power supply 13, 14, 24, 25, 26, 36, 37 DC / DC converter 15, 20, 30 Load 16, 17 Rectifier element 21, 31 Solar power generation 22, 32 Storage battery 23, 33 AC adapter 27, 28 , 29, 34, 35, 38, 39 Diode

Claims (4)

負荷に電力を供給する複数の直流電源を切り替える電源切替回路において、
前記負荷に電力を供給する電力線が電源に接続される複数の電力線に分岐される分岐のうち、負荷に直接接続されている電力線が接続されている分岐におけるすべての電源側配線の分岐近傍に、電源から負荷に電流が流れるようにダイオードを配置し、該ダイオードの電源側近傍に出力電圧の変更が可能なＤＣ／ＤＣコンバータを配置し、前記複数のＤＣ／ＤＣコンバータの出力電圧を調整することにより、前記負荷に供給する前記直流電源の優先順位を設定することを特徴とする電源切替回路。 In a power supply switching circuit that switches a plurality of DC power supplies that supply power to a load,
Of the branches branched to a plurality of power lines connected to the power supply power line for supplying power to the load, in the vicinity of all power supply side wiring branches in the branch connected to the power line directly connected to the load, Disposing a diode so that current flows from the power source to the load, disposing a DC / DC converter capable of changing the output voltage in the vicinity of the power source side of the diode, and adjusting the output voltage of the plurality of DC / DC converters To set a priority order of the DC power supplies to be supplied to the load. 前記複数のＤＣ／ＤＣコンバータの少なくとも一つにおいて、複数の直流電源からの電力線がダイオード分岐を介して接続されていることを特徴とする請求項１に記載の電源切替回路。   2. The power supply switching circuit according to claim 1, wherein in at least one of the plurality of DC / DC converters, power lines from a plurality of DC power supplies are connected via a diode branch. 前記複数のＤＣ／ＤＣコンバータのうち、優先順位の高い直流電源に接続された電力線に設けられたＤＣ／ＤＣコンバータの出力電圧を他のＤＣ／ＤＣコンバータの出力電圧よりも高くすることにより、負荷に電力を供給する直流電源を選択することを特徴とする請求項１または２に記載の電源切替回路。   Among the plurality of DC / DC converters, the output voltage of the DC / DC converter provided on the power line connected to the high-priority direct-current power supply is made higher than the output voltage of the other DC / DC converters. The power supply switching circuit according to claim 1, wherein a DC power supply for supplying power to the power supply is selected. 前記整流素子はダイオードであることを特徴とする請求項１から３のいずれか１項に記載の電源切替回路。   The power supply switching circuit according to any one of claims 1 to 3, wherein the rectifying element is a diode.
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