JP2005080369A

JP2005080369A - Dc/dc converting circuit

Info

Publication number: JP2005080369A
Application number: JP2003306110A
Authority: JP
Inventors: Akitake Takizawa; 聡毅滝沢
Original assignee: Fuji Electric FA Components and Systems Co Ltd
Current assignee: Fuji Electric FA Components and Systems Co Ltd
Priority date: 2003-08-29
Filing date: 2003-08-29
Publication date: 2005-03-24

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a malfunction phenomenon of other apparatus by reducing a high frequency wave leakage current value flowing from a load side of a DC/DC converting circuit through a ground. <P>SOLUTION: The DC/DC converting circuit increases an impedance value of a high frequency leakage current route, by connecting a series circuit of a switch function element 17 and a rectifying function element 18 including a reactor 3 and a diode between a positive side potential and a negative side potential of a DC power source 9 of an input, connecting a series circuit of the reactor 3 and a rectifying functional element 4 including a capacitor 5 and a diode, and connecting a load 6 to the capacitor 5 as a DC output circuit; and decreases its current value. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この発明は、昇圧，降圧が可能なＤＣ／ＤＣ（直流／直流）変換回路に関する。 The present invention relates to a DC / DC (direct current / direct current) conversion circuit capable of step-up and step-down.

図９−１に例えば特許文献１に示されている従来例を示す。
同図において、１は直流電源回路（交流電源入力の場合は、整流回路＋コンデンサとなる）、２はＩＧＢＴ（絶縁ゲート形バイポーラトランジスタ）などのスイッチ素子、３はリアクトル、４はダイオード、５はコンデンサで直流出力として負荷６に接続される。
この回路の動作は、ＩＧＢＴ２がオンすることで電流ｉａが流れ、リアクトル３にエネルギが蓄積される。その後、ＩＧＢＴ２がオフすると、リアクトル３に蓄積されていたエネルギは、コンデンサ５に供給される。 FIG. 9A shows a conventional example shown in Patent Document 1, for example.
In the figure, 1 is a DC power supply circuit (in the case of an AC power supply input, it becomes a rectifier circuit + capacitor), 2 is a switching element such as an IGBT (insulated gate bipolar transistor), 3 is a reactor, 4 is a diode, 5 is The capacitor is connected to the load 6 as a DC output.
In the operation of this circuit, the current ia flows when the IGBT 2 is turned on, and energy is stored in the reactor 3. Thereafter, when the IGBT 2 is turned off, the energy stored in the reactor 3 is supplied to the capacitor 5.

理想的な回路の場合は、入力電圧Ｖ１と出力電圧Ｖ２との関には、ＩＧＢＴ２のオンデューティをαとして、次の（１）式のような関係がある。
Ｖ２＝αＶ／（１−α） …（１）
上記（１）式より、αの値に応じて任意の電圧を出力可能なため、図９−１の回路は昇降圧変換回路となる。また、図９−２にＩＧＢＴ２とダイオード４の接続位置を変えた例を示す。動作的には図９−１と全く同じなので、直列に接続された素子の接続位置の違いによるものは同一のものとし、特に区別しないものとする。 In the case of an ideal circuit, the relationship between the input voltage V1 and the output voltage V2 is expressed by the following equation (1) where the on-duty of the IGBT 2 is α.
V2 = αV / (1-α) (1)
From the above equation (1), since an arbitrary voltage can be output according to the value of α, the circuit of FIG. 9-1 becomes a step-up / down conversion circuit. FIG. 9-2 shows an example in which the connection position of the IGBT 2 and the diode 4 is changed. Since the operation is exactly the same as in FIG. 9A, the difference due to the difference in the connection position of the elements connected in series is assumed to be the same and not particularly distinguished.

図１０に、図９の回路の応用として、入力の直流電源側は交流電源７と整流回路８とコンデンサ９からなり、直流負荷回路としては直流交流変換回路であるインバータ１０（スイッチング素子としてのＩＧＢＴ１１と逆並列ダイオード１２を組とする６組で構成）と、実際の負荷であるモータ１３とからなる例を示す。 In FIG. 10, as an application of the circuit of FIG. 9, the input DC power supply side is composed of an AC power supply 7, a rectifier circuit 8 and a capacitor 9, and the DC load circuit is an inverter 10 (an IGBT 11 as a switching element) which is a DC / AC conversion circuit. And an anti-parallel diode 12 as a set) and an motor 13 that is an actual load.

図１０の回路でインバータ運転を実施した場合、ＩＧＢＴ１１のスイッチングに伴い、モータ１３からはモータの巻線とモータのフレーム間の浮遊容量１４を介しアース１５に漏れ電流が流れる。この漏れ電流は、アース１５および交流電源７を介し、主に図１０のｉ１〜ｉ４の経路で流れる。ここで、ｉ１とｉ２はインバータ１０の下アーム側のＩＧＢＴ（例えばＩＧＢＴ１６）がオンしているときに流れ、ｉ３とｉ４はインバータ１０の上アーム側のＩＧＢＴ（例えばＩＧＢＴ１１）がオンしているときに流れる。 When the inverter operation is performed in the circuit of FIG. 10, a leakage current flows from the motor 13 to the ground 15 via the stray capacitance 14 between the motor winding and the motor frame as the IGBT 11 is switched. This leakage current flows mainly through the paths i1 to i4 in FIG. 10 via the ground 15 and the AC power supply 7. Here, i1 and i2 flow when the IGBT on the lower arm side of the inverter 10 (for example, IGBT16) is turned on, and i3 and i4 flow when the IGBT on the upper arm side of the inverter 10 (for example, IGBT11) is turned on. Flowing into.

特開平１０−３０４５８０号公報（第３−４頁、図１）Japanese Patent Laid-Open No. 10-304580 (page 3-4, FIG. 1)

図１０の電流ｉ１〜ｉ４は高周波電流であるため、同一電源系統につながっている他の装置の誤動作原因になったり、伝導ノイズ規格である雑音端子電圧レベルが高くなり、大型のフィルタが必要になるなどの問題がある。
したがって、この発明の課題は、負荷の浮遊容量とアースを介する高周波電流値を小さくし、同一系統につながっている他の装置の誤動作を低減することにある。 Since the currents i1 to i4 in FIG. 10 are high-frequency currents, it may cause malfunction of other devices connected to the same power supply system, or the noise terminal voltage level, which is a conduction noise standard, becomes high, and a large filter is required. There are problems such as becoming.
Accordingly, an object of the present invention is to reduce the stray capacitance of the load and the high-frequency current value via the ground, and to reduce malfunctions of other devices connected to the same system.

このような課題を解決するため、請求項１の発明では、直流電源回路または交流電源からコンバータを介する直流回路より任意の直流電圧を出力するＤＣ／ＤＣ変換回路において、入力の直流電源の正側電位と負側電位間にスイッチ素子とリアクトルとダイオードを含む整流素子との直列回路を接続し、さらに、前記リアクトルと並列にコンデンサとダイオードを含む整流素子との直列回路を接続し、前記コンデンサを直流出力回路としてこれに負荷を接続することを特徴とする。
請求項２の発明では、直流電源回路または交流電源からコンバータを介する直流回路より任意の直流電圧を出力するＤＣ／ＤＣ変換回路において、入力の直流電源の正側電位と負側電位間にスイッチ素子とリアクトルとの直列回路を接続し、さらに、前記リアクトルと並列にコンデンサと前記コンデンサを中間に配置した２素子以上のダイオードを含む整流素子との直列回路を接続し、前記コンデンサを直流出力回路としてこれに負荷を接続することを特徴とする。 In order to solve such problems, according to the first aspect of the present invention, in the DC power supply circuit or the DC / DC conversion circuit that outputs an arbitrary DC voltage from the AC power supply through the converter, the positive side of the input DC power supply is provided. A series circuit of a switching element, a reactor, and a rectifying element including a diode is connected between the potential and the negative potential, and further, a series circuit of a rectifying element including a capacitor and a diode is connected in parallel with the reactor, and the capacitor is As a direct current output circuit, a load is connected to the circuit.
According to a second aspect of the present invention, there is provided a switching element between a positive side potential and a negative side potential of an input DC power supply in a DC power supply circuit or a DC / DC conversion circuit that outputs an arbitrary DC voltage from an AC power supply through a DC circuit via a converter. And a series circuit of a reactor and a rectifying element including two or more diodes in which the capacitor is disposed in parallel with the reactor, and the capacitor as a DC output circuit. A load is connected to this.

請求項３の発明では、直流電源回路または交流電源からコンバータを介する直流回路より任意の直流電圧を出力するＤＣ／ＤＣ変換回路において、入力の直流電源の正側電位と負側電位間にスイッチ素子とリアクトルとの直列回路を接続し、さらに、前記リアクトルと並列にスイッチ素子とコンデンサとダイオードを含む整流素子との直列回路を接続し、前記コンデンサを直流出力回路としてこれに負荷を接続することを特徴とする。
請求項４の発明では、直流電源回路または交流電源からコンバータを介する直流回路より任意の直流電圧を出力するＤＣ／ＤＣ変換回路において、入力の直流電源の正側電位と負側電位間にスイッチ素子とリアクトルとダイオードを含む整流素子との直列回路を接続し、さらに、前記リアクトルと並列にスイッチ素子とコンデンサとダイオードを含む整流素子との直列回路を接続し、前記コンデンサを直流出力回路としてこれに負荷を接続することを特徴とする。 According to a third aspect of the present invention, there is provided a switching element between a positive side potential and a negative side potential of an input DC power source in a DC power source circuit or a DC / DC conversion circuit that outputs an arbitrary DC voltage from an AC power source through a DC circuit via a converter. Connecting a series circuit of a rectifier including a switching element, a capacitor and a diode in parallel with the reactor, and connecting a load to the capacitor as a DC output circuit. Features.
According to a fourth aspect of the present invention, there is provided a switching element between a positive side potential and a negative side potential of an input DC power supply in a DC power supply circuit or a DC / DC conversion circuit that outputs an arbitrary DC voltage from an AC power supply through a DC circuit via a converter. And a series circuit of a reactor and a rectifying element including a diode, and further, a series circuit of a switching element, a capacitor and a rectifying element including a diode are connected in parallel to the reactor, and the capacitor is used as a DC output circuit. It is characterized by connecting a load.

請求項５の発明では、直流電源回路または交流電源からコンバータを介する直流回路より任意の直流電圧を出力するＤＣ／ＤＣ変換回路において、入力の直流電源の正側電位と負側電位間にリアクトルと前記リアクトルを中間に配置した２素子以上のスイッチ素子との直列回路を接続し、さらに、前記リアクトルと並列にスイッチ素子とコンデンサとダイオードを含む整流素子との直列回路を接続し、前記コンデンサを直流出力回路としてこれに負荷を接続することを特徴とする。
請求項６の発明では、直流電源回路または交流電源からコンバータを介する直流回路より任意の直流電圧を出力するＤＣ／ＤＣ変換回路において、入力の直流電源の正側電位と負側電位間にスイッチ素子とリアクトルとダイオードを含む整流素子との直列回路を接続し、さらに、前記リアクトルと並列にスイッチ素子とコンデンサと逆耐圧機能を有するスイッチ素子との直列回路を接続し、前記コンデンサを直流出力回路としてこれに負荷を接続することを特徴とする。 According to the fifth aspect of the present invention, in the DC / DC conversion circuit that outputs an arbitrary DC voltage from the DC power supply circuit or the DC circuit via the converter from the AC power supply, the reactor is connected between the positive potential and the negative potential of the input DC power supply. A series circuit of two or more switching elements arranged in the middle of the reactor is connected, and further, a series circuit of a switching element, a rectifying element including a capacitor and a diode is connected in parallel with the reactor, and the capacitor is connected to a direct current. As an output circuit, a load is connected to this.
According to a sixth aspect of the present invention, there is provided a switching element between a positive side potential and a negative side potential of an input DC power supply in a DC power supply circuit or a DC / DC conversion circuit that outputs an arbitrary DC voltage from an AC power supply through a converter. And a series circuit of a rectifying element including a reactor and a diode, and further, a series circuit of a switching element, a capacitor, and a switching element having a reverse withstand voltage function is connected in parallel with the reactor, and the capacitor is used as a DC output circuit. A load is connected to this.

請求項７の発明では、直流電源回路または交流電源からコンバータを介する直流回路より任意の直流電圧を出力するＤＣ／ＤＣ変換回路において、入力の直流電源の正側電位と負側電位間にリアクトルと前記リアクトルを中間に配置した２素子以上のスイッチ素子との直列回路を接続し、さらに、前記リアクトルと並列にスイッチ素子とコンデンサと逆耐圧機能を有するスイッチ素子との直列回路を接続し、前記コンデンサを直流出力回路としてこれに負荷を接続することを特徴とする。
すなわち、上記いずれの発明も、負荷側からアースを介して流れる高周波漏れ電流の、電流経路のインピーダンス値をダイオードやスイッチ素子を用いることで等価的に大きくし、漏れ電流値を小さくするものである。 In a seventh aspect of the present invention, in a DC / DC conversion circuit that outputs an arbitrary DC voltage from a DC power supply circuit or an AC power supply through a converter, a reactor is connected between a positive potential and a negative potential of the input DC power supply. Connecting a series circuit of two or more switch elements arranged in the middle of the reactor, and further connecting a series circuit of a switch element, a capacitor, and a switch element having a reverse breakdown voltage function in parallel with the reactor; As a DC output circuit, a load is connected to this.
That is, in any of the above-described inventions, the impedance value of the current path of the high-frequency leakage current flowing from the load side through the ground is equivalently increased by using a diode or a switch element, and the leakage current value is decreased. .

この発明によれば、負荷の浮遊容量とアースを介する高周波電流値が小さくなるため、本装置と同一系統につながっている他の装置の誤動作現象を低減することが可能となる。その結果、伝導ノイズ規格である雑音端子電圧レベルの低減化、ＥＭＩ（ＥｌｅｃｔｒｏｍａｇｎｅｔｉｃＩｎｔｅｒｆｅｒｅｎｃｅ）フィルタの小型化などにより、高信頼で小型低コストの装置が実現可能となる。 According to the present invention, since the high-frequency current value via the stray capacitance of the load and the ground becomes small, it becomes possible to reduce malfunction of other devices connected to the same system as this device. As a result, it is possible to realize a highly reliable, small and low cost apparatus by reducing the noise terminal voltage level, which is a conduction noise standard, and reducing the size of an EMI (Electromagnetic Interference) filter.

図１−１はこの発明の第１の実施の形態その１を示す構成図である。
図１からも明らかなように、これは図９，図１０の従来例に対し、コンデンサ９とリアクトル３間にダイオード１８を接続した点が特徴である。こうすることで、図１０における電流ｉ１がダイオード１８によってブロックされ、流れなくなる。その分、従来のものより浮遊容量１４およびアース１５を介する漏れ電流値は減少する。ダイオード１８の代わりに、逆耐圧のあるスイッチング素子や複合素子などを用いることができ、以下、これをダイオードを含む整流素子とも言う。 FIG. 1-1 is a block diagram showing a first embodiment 1 of the present invention.
As is apparent from FIG. 1, this is characterized in that a diode 18 is connected between the capacitor 9 and the reactor 3 with respect to the conventional example of FIGS. By doing so, the current i1 in FIG. 10 is blocked by the diode 18 and does not flow. Accordingly, the leakage current value via the stray capacitance 14 and the ground 15 is reduced as compared with the conventional one. Instead of the diode 18, a switching element or a composite element having a reverse withstand voltage can be used. Hereinafter, this is also referred to as a rectifying element including a diode.

図１−２はこの発明の第１の実施の形態その２を示す構成図である。
図１−１に対し、コンデンサ５とリアクトル３間にダイオード１９を接続して構成される。こうすることで、図１０における電流ｉ４もダイオード１９によってブロックされ、流れなくなる。その分、従来のものより浮遊容量１４およびアース１５を介する漏れ電流値は、図１−１に示すものより減少する。 FIG. 1-2 is a block diagram showing a first embodiment 2 of the present invention.
1-1, a diode 19 is connected between the capacitor 5 and the reactor 3. By doing so, the current i4 in FIG. 10 is also blocked by the diode 19 and does not flow. Accordingly, the leakage current value via the stray capacitance 14 and the ground 15 is smaller than that shown in FIG.

図２はこの発明の第２の実施の形態を示す構成図である。
図９，図１０の従来例に対し、コンデンサ５とリアクトル３間にダイオード１９を接続した点が特徴である。こうすることで、図１０における電流ｉ４がダイオード１９によってブロックされ、流れなくなる。その分、従来のものより浮遊容量１４およびアース１５を介する漏れ電流値は減少する。 FIG. 2 is a block diagram showing a second embodiment of the present invention.
9 and 10 is characterized in that a diode 19 is connected between the capacitor 5 and the reactor 3. By doing so, the current i4 in FIG. 10 is blocked by the diode 19 and does not flow. Accordingly, the leakage current value via the stray capacitance 14 and the ground 15 is reduced as compared with the conventional one.

図３−１は図２の変形例その１を示す構成図である。
図９，図１０の従来例に対し、コンデンサ９とリアクトル３間にＩＧＢＴなどのスイッチ素子２０を接続し、このスイッチ素子２０をスイッチ素子１７と同時にオン，オフさせる点が特徴である。こうすることで、スイッチ素子１７，２０がオフしている期間中は、図１０における電流ｉ１〜ｉ４は流れなくなる。その分、従来のものより浮遊容量１４およびアース１５を介する漏れ電流値は減少する。 FIG. 3A is a configuration diagram illustrating a first modification of FIG.
9 and 10 is characterized in that a switch element 20 such as an IGBT is connected between the capacitor 9 and the reactor 3 and the switch element 20 is turned on and off simultaneously with the switch element 17. By doing so, the currents i1 to i4 in FIG. 10 do not flow while the switch elements 17 and 20 are off. Accordingly, the leakage current value via the stray capacitance 14 and the ground 15 is reduced as compared with the conventional one.

図３−２は図２の変形例その２を示す構成図である。
図３−１に示すものに対し、コンデンサ５とリアクトル３間にダイオード１９を接続した点が特徴である。こうすることで、スイッチ素子１７，２０がオフしている期間中は、図１０における電流ｉ１〜ｉ４は流れなくなるとともに、オンしている期間にも電流ｉ４がダイオード１９によってブロックされて流れなくなり、その分、従来のものより浮遊容量１４およびアース１５を介する漏れ電流値は、図３−１のものより減少する。 FIG. 3-2 is a configuration diagram showing a second modification of FIG.
A characteristic of the device shown in FIG. 3A is that a diode 19 is connected between the capacitor 5 and the reactor 3. By doing so, the currents i1 to i4 in FIG. 10 do not flow during the period when the switch elements 17 and 20 are off, and the current i4 is blocked by the diode 19 and does not flow during the period when the switch elements 17 and 20 are on. Accordingly, the leakage current value through the stray capacitance 14 and the ground 15 is smaller than that in FIG.

図４はこの発明の第３の実施の形態を示す構成図である。
図９，図１０の従来例に対し、コンデンサ５とリアクトル３間にＩＧＢＴなどのスイッチ素子２１とダイオード１９を接続し、スイッチ素子１７とスイッチ素子２１を交互にオン，オフさせる点が特徴である。こうすることで、スイッチ素子２１がオフしている期間中は、図１０における電流ｉ３，ｉ４はスイッチ素子２１とダイオード１９によってブロックされ、流れなくなる。その分、従来のものより浮遊容量１４およびアース１５を介する漏れ電流値は減少する。 FIG. 4 is a block diagram showing a third embodiment of the present invention.
9 and 10 is characterized in that a switch element 21 such as an IGBT and a diode 19 are connected between the capacitor 5 and the reactor 3, and the switch element 17 and the switch element 21 are alternately turned on and off. . Thus, during the period when the switch element 21 is off, the currents i3 and i4 in FIG. 10 are blocked by the switch element 21 and the diode 19 and do not flow. Accordingly, the leakage current value via the stray capacitance 14 and the ground 15 is reduced as compared with the conventional one.

図５はこの発明の第４の実施の形態を示す構成図である。
図４に示すものに対し、コンデンサ９とリアクトル３間にダイオード１８を接続した点が特徴である。こうすることで、図１０における電流ｉ１がダイオード１８によってブロックされ、流れなくなる。その分、従来のものより浮遊容量１４およびアース１５を介する漏れ電流値は、図４に示すものよりも減少する。 FIG. 5 is a block diagram showing a fourth embodiment of the present invention.
4 is characterized in that a diode 18 is connected between the capacitor 9 and the reactor 3. By doing so, the current i1 in FIG. 10 is blocked by the diode 18 and does not flow. Accordingly, the leakage current value through the stray capacitance 14 and the ground 15 is smaller than that shown in FIG.

図６はこの発明の第５の実施の形態を示す構成図である。
図４に示すものに対し、コンデンサ９とリアクトル３間にスイッチ素子２０を接続し、スイッチ素子１７とスイッチ素子２０は同時にオン，オフさせ、２１とは交互にオン，オフさせる点が特徴である。こうすることで、スイッチ素子１７，２０がオフしている期間中は、図１０における電流ｉ１〜ｉ４は流れなくなるとともに、オンしている期間にもスイッチ素子２１はオフしているため、電流ｉ３，ｉ４はスイッチ素子２１とダイオード１９によってブロックされて流れなくなり、その分、従来のものより浮遊容量１４およびアース１５を介する漏れ電流値は、図４に示すものよりも減少する。 FIG. 6 is a block diagram showing a fifth embodiment of the present invention.
4 is characterized in that a switch element 20 is connected between the capacitor 9 and the reactor 3, the switch element 17 and the switch element 20 are simultaneously turned on and off, and 21 is alternately turned on and off. . By doing so, the currents i1 to i4 in FIG. 10 do not flow during the period when the switch elements 17 and 20 are off, and the switch element 21 is also off during the period when the switch elements 17 and 20 are on. , I4 is blocked by the switching element 21 and the diode 19 and does not flow, and accordingly, the leakage current value via the stray capacitance 14 and the ground 15 is smaller than that shown in FIG.

図７−１はこの発明の第６の実施の形態その１を示す構成図である。
図５に示すものに対し、逆耐圧機能を有するスイッチ素子として、ダイオード１９と直列にスイッチ素子２２を接続し、スイッチ素子１７とスイッチ素子２１，２２とを交互にオン，オフさせる点が特徴である。こうすることで、スイッチ素子２１，２２がオフしている期間中は、図１０における電流ｉ１〜ｉ４は流れなくなるとともに、オンしている期間にもオフしているスイッチ素子１７とダイオード１８によって電流ｉ１，ｉ２はブロックされて流れなくなり、その分、浮遊容量１４およびアース１５を介する漏れ電流値は、図５に示すものよりも減少する。 FIG. 7-1 is a block diagram showing the first embodiment of the sixth embodiment of the present invention.
5 is characterized in that, as a switch element having a reverse withstand voltage function, a switch element 22 is connected in series with a diode 19 and the switch element 17 and the switch elements 21 and 22 are alternately turned on and off. is there. By doing so, the currents i1 to i4 in FIG. 10 do not flow during the period in which the switch elements 21 and 22 are off, and the current by the switch element 17 and the diode 18 that are also off during the on period. i1 and i2 are blocked and do not flow, and accordingly, the leakage current value via the stray capacitance 14 and the ground 15 is smaller than that shown in FIG.

図７−２はこの発明の第６の実施の形態その２を示す構成図である。
図７−１に示すものに対し、スイッチ素子２２とダイオード１９の代わりに、ＧＴＯ（ゲートターンオフサイリスタ）などの逆耐圧機能を有するスイッチ素子２３を用いた例である。その動作，効果は図７−１と同様である。 FIG. 7-2 is a block diagram showing the second embodiment 6 of the present invention.
FIG. 7A shows an example in which a switch element 23 having a reverse breakdown voltage function such as a GTO (gate turn-off thyristor) is used instead of the switch element 22 and the diode 19. The operation and effect are the same as in FIG.

図８−１はこの発明の第７の実施の形態その１を示す構成図である。
図６に示すものに対し、逆耐圧機能を有するスイッチ素子として、ダイオード１９と直列にスイッチ素子２２を接続し、これをスイッチ素子２１と同時にオン，オフさせる点が特徴である。こうすることで、スイッチ素子１７，２０がオフしている期間中は、図１０における電流ｉ１〜ｉ４は流れなくなるとともに、オンしている期間にもスイッチ素子２１，２２はオフしているため、電流ｉ１〜ｉ４は流れない。これにより、原理的には浮遊容量１４およびアース１５を介する漏れ電流値をなくすことができる。 FIG. 8-1 is a block diagram showing the first embodiment 1 of the present invention.
6 is characterized in that, as a switch element having a reverse withstand voltage function, a switch element 22 is connected in series with the diode 19 and is turned on / off simultaneously with the switch element 21. By doing so, the currents i1 to i4 in FIG. 10 do not flow while the switch elements 17 and 20 are off, and the switch elements 21 and 22 are also off during the on period. Currents i1 to i4 do not flow. Thereby, in principle, the leakage current value via the stray capacitance 14 and the ground 15 can be eliminated.

図８−２はこの発明の第７の実施の形態その２を示す構成図である。
図８−１に示すものに対し、スイッチ素子２２とダイオード１９の代わりに、ＧＴＯ（ゲートターンオフサイリスタ）などの逆耐圧機能を有するスイッチ素子２３を用いた例である。その動作，効果は図８−１と同様である。 FIG. 8-2 is a block diagram showing a second embodiment 7 of the present invention.
FIG. 8A shows an example in which a switch element 23 having a reverse breakdown voltage function such as a GTO (gate turn-off thyristor) is used instead of the switch element 22 and the diode 19. The operation and effect are the same as in FIG.

この発明の第１の実施の形態その１を示す構成図Configuration diagram showing the first embodiment 1 of the present invention この発明の第１の実施の形態その２を示す構成図The block diagram which shows the 1st Embodiment 2 of this invention この発明の第２の実施の形態を示す構成図The block diagram which shows 2nd Embodiment of this invention 図２の変形例その１を示す構成図The block diagram which shows the modification 1 of FIG. 図２の変形例その２を示す構成図FIG. 2 is a block diagram showing a second modification of FIG. この発明の第３の実施の形態を示す構成図The block diagram which shows 3rd Embodiment of this invention この発明の第４の実施の形態を示す構成図The block diagram which shows 4th Embodiment of this invention この発明の第５の実施の形態を示す構成図The block diagram which shows 5th Embodiment of this invention この発明の第６の実施の形態その１を示す構成図The block diagram which shows the 6th Embodiment 1 of this invention この発明の第６の実施の形態その２を示す構成図The block diagram which shows the 6th Embodiment 2 of this invention この発明の第７の実施の形態その１を示す構成図The block diagram which shows the 7th Embodiment of this invention 1 この発明の第７の実施の形態その２を示す構成図The block diagram which shows the 7th Embodiment of this invention 2 昇降圧形ＤＣ／ＤＣ変換回路の従来例を示す回路図Circuit diagram showing a conventional example of a step-up / step-down DC / DC converter circuit 図９−１の変形例を示す回路図Circuit diagram showing a modification of FIG. インバータ回路図と漏れ電流経路説明図Inverter circuit diagram and leakage current path explanatory diagram

Explanation of symbols

１…直流電源、２，１７，２０，２１，２２，２３…スイッチ素子、３…リアクトル、４，１８，１９…ダイオード、５，９…コンデンサ、６…負荷。 DESCRIPTION OF SYMBOLS 1 ... DC power supply, 2, 17, 20, 21, 22, 23 ... Switch element, 3 ... Reactor, 4, 18, 19 ... Diode, 5, 9 ... Capacitor, 6 ... Load.

Claims

In a DC / DC conversion circuit that outputs an arbitrary DC voltage from a DC power supply circuit or a DC circuit via a converter from an AC power supply, rectification including a switch element, a reactor, and a diode between the positive side potential and the negative side potential of the input DC power source A DC circuit comprising: connecting a series circuit with an element; connecting a series circuit of a rectifier element including a capacitor and a diode in parallel with the reactor; and connecting the capacitor to a load as a DC output circuit. / DC conversion circuit.

In a DC / DC conversion circuit that outputs an arbitrary DC voltage from a DC power supply circuit or an AC power supply through a converter, a series circuit of a switch element and a reactor is provided between the positive potential and negative potential of the input DC power supply. Connecting a series circuit of a capacitor and a rectifying element including two or more diodes arranged in parallel with the reactor in parallel with the reactor, and connecting the capacitor to a load as a DC output circuit DC / DC conversion circuit characterized by the above.

In a DC / DC conversion circuit that outputs an arbitrary DC voltage from a DC power supply circuit or an AC power supply through a converter, a series circuit of a switch element and a reactor is provided between the positive potential and negative potential of the input DC power supply. DC / DC conversion characterized by connecting a series circuit of a switch element, a capacitor, and a rectifier element including a diode in parallel with the reactor, and connecting the capacitor to a load as a DC output circuit circuit.

In a DC / DC conversion circuit that outputs an arbitrary DC voltage from a DC power supply circuit or a DC circuit via a converter from an AC power supply, rectification including a switch element, a reactor, and a diode between the positive side potential and the negative side potential of the input DC power source A series circuit with an element is connected, and further, a series circuit of a switching element, a capacitor and a rectifying element including a diode is connected in parallel with the reactor, and the capacitor is connected to a load as a DC output circuit. DC / DC conversion circuit.

In a DC / DC conversion circuit that outputs an arbitrary DC voltage from a DC power supply circuit or an AC power supply through a converter, the reactor and the reactor are arranged between the positive potential and negative potential of the input DC power supply. A series circuit of two or more switch elements is connected, and a series circuit of a switch element, a rectifier element including a capacitor and a diode is connected in parallel with the reactor, and the capacitor is used as a DC output circuit as a load. A DC / DC conversion circuit characterized by being connected.

In a DC / DC conversion circuit that outputs an arbitrary DC voltage from a DC power supply circuit or a DC circuit via a converter from an AC power supply, rectification including a switch element, a reactor, and a diode between the positive side potential and the negative side potential of the input DC power source Connect a series circuit with an element, and further connect a series circuit of a switch element, a capacitor, and a switch element having a reverse withstand voltage function in parallel with the reactor, and connect the capacitor to a load as a DC output circuit. DC / DC conversion circuit characterized by the above.

In a DC / DC conversion circuit that outputs an arbitrary DC voltage from a DC power supply circuit or a DC circuit via a converter from an AC power supply, the reactor and the reactor are arranged between the positive potential and the negative potential of the input DC power supply. A series circuit of two or more switch elements is connected, and a series circuit of a switch element, a capacitor, and a switch element having a reverse withstand voltage function is connected in parallel with the reactor, and the capacitor is used as a DC output circuit. A DC / DC conversion circuit characterized by being connected to a load.