JP4637413B2 - Switching power supply - Google Patents
Switching power supply Download PDFInfo
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- JP4637413B2 JP4637413B2 JP2001225854A JP2001225854A JP4637413B2 JP 4637413 B2 JP4637413 B2 JP 4637413B2 JP 2001225854 A JP2001225854 A JP 2001225854A JP 2001225854 A JP2001225854 A JP 2001225854A JP 4637413 B2 JP4637413 B2 JP 4637413B2
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- 238000004804 winding Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000009499 grossing Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Description
【０００１】
【発明の属する技術分野】
本発明は、多出力のスイッチング電源装置に関するものであり、電圧制御系の電流変動に対して、非電圧制御系の電圧の安定化を図り、かつ待機時の消費電力を低減することができるスイッチング電源装置に関するものである。
【０００２】
【従来の技術】
この種の電源装置として、図２のものが提案されている。
電圧制御系の出力側では、出力巻線Ｐ２で得られる電圧を整流・平滑後、分圧抵抗で分圧された電圧に基づき制御回路でスイッチング素子Ｑ１を制御して安定化した出力電圧Ｖ１を得ている。また、非電圧制御系の出力側では、出力巻線Ｐ３で得られる電圧を整流・平滑した電圧Ｖ２を定電圧回路ＩＣ１に入力して安定化した出力電圧Ｖ３を得ている。しかし、電圧制御系の負荷は、動作時に大きく、待機時に小さくなるため、動作時／待機時に関係なく入力電圧Ｖ２が定電圧回路ＩＣ１に入力される非電圧制御系では、定電圧回路ＩＣ１から接地端子へと回路電流が流れ、待機時に電力損失が発生するという問題を有していた。
【０００３】
【発明が解決しようとする課題】
このように、従来の定電圧回路ＩＣ１を用いる手段では、回路電流Ｉ２による電力損失が発生し、待機時の消費電力が増大するという問題があったため、多出力のスイッチング電源装置において、定電圧回路ＩＣ１を使用することなく出力を安定化させることができ、かつ待機時の電力損失の少ないスイッチング電源装置が要求されていた。
【０００４】
【課題を解決するための手段】
本発明は、上記の課題を解決するもので、図１のように非電圧制御系の出力側と接地側との間に直列接続された抵抗と定電圧ダイオードにより、非電圧制御系の入力電圧Ｖ２の上昇を抑え、待機時には抵抗Ｒ３、定電圧ダイオードＤ３による損失をゼロにするスイッチング電源装置を提供するものである。
【０００５】
すなわち、整流して得られる直流電圧を一次側のスイッチング素子Ｑ１でオン／オフすることにより、コンバータトランスＴの二次側回路に電圧を安定供給する負帰還電圧制御系と他の非電圧制御系とからなる多出力のスイッチング電源装置において、非電圧制御系の出力側と接地側とを抵抗Ｒ３と定電圧ダイオードＤ３とで直列接続し、負帰還電圧制御系の負荷が大きい動作時に、非電圧制御系の入力電圧が定電圧ダイオードＤ３のツェナー電圧値を超えた時点で非電圧制御系の出力電圧の上昇を抑制する一方、負帰還電圧制御系の負荷が小さい待機時に、非電圧制御系の入力電圧が定電圧ダイオードＤ３のツェナー電圧値以下になると、抵抗Ｒ３および定電圧ダイオードＤ３における電力損失をゼロにすることを特徴とするスイッチング電源装置である。
【０００６】
【発明の実施の形態】
以下、本発明について、図面を参照しながら詳細に説明する。図１は、本発明による非電圧制御系の出力段に抵抗Ｒ３と定電圧ダイオードＤ３とを直列接続した多出力のスイッチング電源装置の一例である。
Ｅｉｎは入力電源、Ｑ１はスイッチング素子、Ｔは一次側に蓄積されたエネルギーを二次側へと伝達するためのコンバータトランス、Ｐ１は一次主巻線、Ｐ２は電圧制御系用の出力巻線、Ｐ３は非電圧制御系用の出力巻線、Ｖ１は電圧制御系の出力電圧、Ｖ２は非電圧制御系の入力電圧、Ｖ３は非電圧制御系の出力電圧、Ｒ３は抵抗、Ｄ３は定電圧ダイオードである。
抵抗Ｒ３と定電圧ダイオードＤ３とを直列接続したものを非電圧制御系出力段に入れたことが、従来の多出力のスイッチング電源装置と異なる点であり、この構成のスイッチング電源装置により、非電圧制御系の出力電圧の安定化を図るとともに待機時の電力損失を少なくすることができる。すなわち、非電圧制御系の入力電圧Ｖ２は、図３に示すように動作時の制御系出力電流Ｉ１の増大に比例して上昇するが、定電圧ダイオードＤ３のツェナー電圧値を超えた時点で回路電流Ｉ３が流れ、非電圧制御系の出力電圧Ｖ３の上昇が抑えられる。また、待機時は、電圧制御系出力電流Ｉ１の減少に比例して入力電圧Ｖ２が降下し、定電圧ダイオードＤ３のツェナー電圧以下になると、図４に示すように回路電流Ｉ３が流れなくなり、抵抗Ｒ３、および定電圧ダイオードＤ３での電力損失がゼロとなる。
ところが、従来例では、図３の点線で示したとおり、動作時において、定電圧ダイオードＤ３のツェナー電圧を超えた時、非電圧制御系の出力電圧Ｖ３の上昇が抑えられることがなく、また、図４の点線で示したとおり、待機時において、ツェナー電圧以下となった時も回路電流Ｉ３が流れているので、電力損失を抑えることができない。
【０００７】
図３は、抵抗Ｒ３と定電圧ダイオードＤ３とが接続された実施例と、抵抗Ｒ３と定電圧ダイオードではなく、定電圧回路ＩＣ１を接続した従来例の制御系出力電流Ｉ１に対する非電圧制御系電圧Ｖ３との関係を示し、図４は非電圧制御系電圧Ｖ３に対する回路電流Ｉ３の関係を示す。
図３、図４から分かるように、非電圧制御系電圧Ｖ３がＤ３のツェナー電圧を超えた時点で電圧上昇が抑えられ、また待機時には、回路電流Ｉ３がゼロとなり、回路電流による損失をなくすことができる。
【０００８】
【発明の効果】
上記のように、非制御系の出力段に抵抗Ｒ３と定電圧ダイオードＤ３とを直列接続することにより、非制御系の電圧を安定させるとともに、待機時には回路電流をゼロにすることができ、待機時の消費電力を低減できる多出力のスイッチング電源装置を提供することができる。
【図面の簡単な説明】
【図１】本発明によるスイッチング電源装置の実施例を示した回路図である。
【図２】従来のスイッチング電源装置の回路図である。
【図３】図１の実施例による回路と、図２の従来例による回路との制御系出力電流Ｉ１に対する非電圧制御系電圧Ｖ３の特性比較図である。
【図４】図１の実施例による回路の非電圧制御系電圧Ｖ３に対する回路電流Ｉ３の特性図である。
【符号の説明】
Ｅｉｎ 入力電源
Ｑ１ スイッチング素子
Ｔ コンバータトランス
Ｐ１ １次主巻線
Ｐ２ 電圧制御系用の出力巻線
Ｐ３ 非電圧制御系用の出力巻線
ＩＣ１ 定電圧回路
Ｖ１ 電圧制御系の出力電圧
Ｖ２ 非電圧制御系の入力電圧
Ｖ３ 非電圧制御系の出力電圧
Ｉ１ 電圧制御系の出力電流
Ｃ２，Ｃ３ コンデンサ
Ｒ１，Ｒ２ 抵抗
Ｒ３ 抵抗（ダミー抵抗）
Ｄ１，Ｄ２ ダイオード
Ｄ３ 定電圧ダイオード
Ｉ２ ＩＣ１の回路電流
Ｉ３ Ｒ３およびＤ３の回路電流（ダミー電流）[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a multi-output switching power supply apparatus, which is capable of stabilizing the voltage of a non-voltage control system against current fluctuations in the voltage control system and reducing power consumption during standby. The present invention relates to a power supply device.
[0002]
[Prior art]
As this type of power supply device, the one shown in FIG. 2 has been proposed.
On the output side of the voltage control system, after rectifying and smoothing the voltage obtained by the output winding P2, the control circuit controls the switching element Q1 based on the voltage divided by the voltage dividing resistor, and the output voltage V1 stabilized is obtained. It has gained. On the output side of the non-voltage control system, a voltage V2 obtained by rectifying and smoothing the voltage obtained at the output winding P3 is input to the constant voltage circuit IC1 to obtain a stabilized output voltage V3. However, since the load of the voltage control system is large during operation and small during standby, in the non-voltage control system in which the input voltage V2 is input to the constant voltage circuit IC1 regardless of operation / standby, the load is grounded from the constant voltage circuit IC1. There is a problem that a circuit current flows to the terminal and power loss occurs during standby.
[0003]
[Problems to be solved by the invention]
As described above, in the means using the conventional constant voltage circuit IC1, there is a problem that the power loss due to the circuit current I2 occurs and the power consumption during standby increases. Therefore, in the multi-output switching power supply apparatus, the constant voltage circuit There has been a demand for a switching power supply device that can stabilize the output without using the IC 1 and has low power loss during standby.
[0004]
[Means for Solving the Problems]
The present invention solves the above-described problem. As shown in FIG. 1, the input voltage of the non-voltage control system is constituted by a resistor and a constant voltage diode connected in series between the output side and the ground side of the non-voltage control system. The present invention provides a switching power supply device that suppresses the increase in V2 and that eliminates the loss caused by the resistor R3 and the constant voltage diode D3 during standby.
[0005]
That is, a negative feedback voltage control system and other non-voltage control systems that stably supply a voltage to the secondary side circuit of the converter transformer T by turning on / off the DC voltage obtained by rectification by the switching element Q1 on the primary side. In a multi-output switching power supply device comprising: a non-voltage control system output side and a ground side are connected in series by a resistor R3 and a constant voltage diode D3, and the negative feedback voltage control system has a large load during operation. When the input voltage of the control system exceeds the Zener voltage value of the constant voltage diode D3, the rise of the output voltage of the non-voltage control system is suppressed, while the non-voltage control system When the input voltage falls below the Zener voltage of the constant voltage diode D3, switching, characterized in that the power loss in the resistors R3 and constant voltage diodes D3 to zero The source is a device.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an example of a multi-output switching power supply device in which a resistor R3 and a constant voltage diode D3 are connected in series to an output stage of a non-voltage control system according to the present invention.
Ein is an input power source, Q1 is a switching element, T is a converter transformer for transmitting energy accumulated on the primary side to the secondary side, P1 is a primary main winding, P2 is an output winding for a voltage control system, P3 is an output winding for the non-voltage control system, V1 is an output voltage of the voltage control system, V2 is an input voltage of the non-voltage control system, V3 is an output voltage of the non-voltage control system, R3 is a resistor, D3 is a constant voltage diode It is.
The difference between the resistor R3 and the constant voltage diode D3 connected in series in the non-voltage control system output stage is the difference from the conventional multi-output switching power supply device. It is possible to stabilize the output voltage of the control system and reduce power loss during standby. That is, the input voltage V2 of the non-voltage control system rises in proportion to the increase of the control system output current I1 during operation as shown in FIG. 3, but the circuit is reached when the Zener voltage value of the constant voltage diode D3 is exceeded. A current I3 flows, and an increase in the output voltage V3 of the non-voltage control system is suppressed. During standby, when the input voltage V2 drops in proportion to the decrease in the voltage control system output current I1 and becomes equal to or lower than the Zener voltage of the constant voltage diode D3, the circuit current I3 stops flowing as shown in FIG. The power loss at R3 and the constant voltage diode D3 becomes zero.
However, in the conventional example, as shown by the dotted line in FIG. 3, when the zener voltage of the constant voltage diode D3 is exceeded during operation, the increase in the output voltage V3 of the non-voltage control system is not suppressed, As indicated by the dotted line in FIG. 4, the power loss cannot be suppressed because the circuit current I3 flows even when the voltage becomes equal to or lower than the Zener voltage during standby.
[0007]
FIG. 3 shows a non-voltage control system voltage with respect to the control system output current I1 in the embodiment in which the resistor R3 and the constant voltage diode D3 are connected and in the conventional example in which the resistor R3 and the constant voltage diode are connected instead of the constant voltage circuit IC1. FIG. 4 shows the relationship between the circuit current I3 and the non-voltage control system voltage V3.
As can be seen from FIGS. 3 and 4, the voltage rise is suppressed when the non-voltage control system voltage V3 exceeds the Zener voltage of D3, and the circuit current I3 becomes zero during standby, thereby eliminating the loss due to the circuit current. Can do.
[0008]
【The invention's effect】
As described above, by connecting the resistor R3 and the constant voltage diode D3 in series to the output stage of the non-control system, the voltage of the non-control system can be stabilized and the circuit current can be made zero during standby. It is possible to provide a multi-output switching power supply device that can reduce power consumption at the time.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing an embodiment of a switching power supply device according to the present invention.
FIG. 2 is a circuit diagram of a conventional switching power supply device.
3 is a characteristic comparison diagram of non-voltage control system voltage V3 with respect to control system output current I1 between the circuit according to the embodiment of FIG. 1 and the circuit according to the conventional example of FIG. 2;
4 is a characteristic diagram of a circuit current I3 with respect to a non-voltage control system voltage V3 of the circuit according to the embodiment of FIG.
[Explanation of symbols]
Ein input power source Q1 switching element T converter transformer P1 primary main winding P2 output winding P3 for voltage control system output winding IC1 for non-voltage control system constant voltage circuit V1 output voltage V2 for voltage control system non-voltage control system Input voltage V3 Non-voltage control system output voltage I1 Voltage control system output current C2, C3 Capacitors R1, R2 Resistor R3 Resistor (dummy resistor)
D1, D2 Diode D3 Constant voltage diode I2 IC1 circuit current I3 R3 and D3 circuit current (dummy current)
Claims (1)
非電圧制御系の出力側と接地側とを抵抗と定電圧ダイオードとで直列接続し、
前記負帰還電圧制御系の負荷が大きい動作時に、前記非電圧制御系の入力電圧が前記定電圧ダイオードのツェナー電圧値を超えた時点で前記非電圧制御系の出力電圧の上昇を抑制する一方、
前記負帰還電圧制御系の負荷が小さい待機時に、前記非電圧制御系の入力電圧が前記定電圧ダイオードのツェナー電圧値以下になると、前記抵抗および前記定電圧ダイオードにおける電力損失をゼロにすることを特徴とするスイッチング電源装置。A DC voltage obtained by rectification is turned on / off by a switching element on the primary side, whereby a negative feedback voltage control system that stably supplies a voltage to the secondary side circuit of the converter transformer and another non-voltage control system. In the output switching power supply,
Connect the output side and the ground side of the non-voltage control system in series with a resistor and a constant voltage diode ,
While operating the load of the negative feedback voltage control system is large, while suppressing the rise of the output voltage of the non-voltage control system when the input voltage of the non-voltage control system exceeds the Zener voltage value of the constant voltage diode,
When the input voltage of the non-voltage control system is equal to or less than the Zener voltage value of the constant voltage diode during standby when the load of the negative feedback voltage control system is small, power loss in the resistor and the constant voltage diode is reduced to zero. A switching power supply device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001225854A JP4637413B2 (en) | 2001-07-26 | 2001-07-26 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001225854A JP4637413B2 (en) | 2001-07-26 | 2001-07-26 | Switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003037977A JP2003037977A (en) | 2003-02-07 |
| JP4637413B2 true JP4637413B2 (en) | 2011-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001225854A Expired - Fee Related JP4637413B2 (en) | 2001-07-26 | 2001-07-26 | Switching power supply |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594124A (en) * | 2012-02-28 | 2012-07-18 | 深圳麦格米特电气股份有限公司 | Switching power circuit and control method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101720496B1 (en) * | 2015-08-27 | 2017-04-10 | 엘지전자 주식회사 | Power converting apparatus and air conditioner including the same |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4522221Y1 (en) * | 1966-09-10 | 1970-09-03 | ||
| JPS61235920A (en) * | 1985-04-11 | 1986-10-21 | Yanmar Diesel Engine Co Ltd | Voltage clipping circuit |
| JPH07288976A (en) * | 1994-04-18 | 1995-10-31 | Nippondenso Co Ltd | Multi-output converter |
| JP2000333452A (en) * | 1999-05-19 | 2000-11-30 | Murata Mfg Co Ltd | Forward converter |
| JP2000350452A (en) * | 1999-06-02 | 2000-12-15 | Canon Inc | Switching power-supply unit and switching control method |
-
2001
- 2001-07-26 JP JP2001225854A patent/JP4637413B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4522221Y1 (en) * | 1966-09-10 | 1970-09-03 | ||
| JPS61235920A (en) * | 1985-04-11 | 1986-10-21 | Yanmar Diesel Engine Co Ltd | Voltage clipping circuit |
| JPH07288976A (en) * | 1994-04-18 | 1995-10-31 | Nippondenso Co Ltd | Multi-output converter |
| JP2000333452A (en) * | 1999-05-19 | 2000-11-30 | Murata Mfg Co Ltd | Forward converter |
| JP2000350452A (en) * | 1999-06-02 | 2000-12-15 | Canon Inc | Switching power-supply unit and switching control method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594124A (en) * | 2012-02-28 | 2012-07-18 | 深圳麦格米特电气股份有限公司 | Switching power circuit and control method |
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| Publication number | Publication date |
|---|---|
| JP2003037977A (en) | 2003-02-07 |
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