JP2000253662A - Switching power supply - Google Patents
Switching power supplyInfo
- Publication number
- JP2000253662A JP2000253662A JP11056413A JP5641399A JP2000253662A JP 2000253662 A JP2000253662 A JP 2000253662A JP 11056413 A JP11056413 A JP 11056413A JP 5641399 A JP5641399 A JP 5641399A JP 2000253662 A JP2000253662 A JP 2000253662A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- capacitor
- switching power
- light load
- charging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、商用電源を入力と
するスイッチング電源に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching power supply having a commercial power supply as an input.
【０００２】[0002]
【従来の技術】図３は、従来のスイッチング電源の効率
特性例を示す図であり、図４は、その回路構成例を示す
図である。図４において、商用電源１をダイオードブリ
ッジ２およびコンデンサ３により整流平滑し、得られた
直流電圧をスイッチング電源制御回路１３からの信号で
ＭＯＳＦＥＴ５をスイッチングし、トランス４の２次側
に接続されたダイオード６およびコンデンサ７で整流平
滑して、負荷１２に直流電力を供給している。2. Description of the Related Art FIG. 3 is a diagram showing an example of efficiency characteristics of a conventional switching power supply, and FIG. 4 is a diagram showing an example of a circuit configuration thereof. In FIG. 4, the commercial power supply 1 is rectified and smoothed by a diode bridge 2 and a capacitor 3, the obtained DC voltage is switched by a signal from a switching power supply control circuit 13 to a MOSFET 5, and a diode connected to a secondary side of a transformer 4. DC power is supplied to the load 12 after being rectified and smoothed by the capacitor 6 and the capacitor 7.
【０００３】一般に、スイッチング電源の場合、図３に
示すように定格負荷時の効率に比べ軽負荷時の効率は非
常に悪くなる。例えば、定格負荷時の効率が８０％なの
に対して、軽負荷時の効率は２０％程度になる。但し、
変換電力が小さいため、発生している損失そのものは小
さく、例えば発熱などもあまり問題とはならない。その
ため、軽負荷の場合でも、効率が低い状態で使用してい
た。例えば、テレビなどに代表されるように、使用して
いないときにもリモコンの信号が受信可能となるよう
に、制御回路の一部を動作させている（待機状態）が、
これがスイッチング電源を軽負荷で使用している状態で
ある。In general, in the case of a switching power supply, as shown in FIG. 3, the efficiency under a light load is much lower than the efficiency under a rated load. For example, while the efficiency under a rated load is 80%, the efficiency under a light load is about 20%. However,
Since the converted power is small, the generated loss itself is small and, for example, heat generation does not cause much problem. Therefore, even in the case of a light load, it has been used with a low efficiency. For example, as typified by a television, a part of the control circuit is operated (standby state) so that a signal of a remote controller can be received even when not in use.
This is a state in which the switching power supply is used with a light load.
【０００４】しかし、近年、待機状態の電力消費が問題
になってきている。待機状態の電力は小さいが継続時間
が長いため、総合的な使用電力量は大きくなってしま
う。このため、この待機時の消費電力を小さく押さえよ
うとする動きがある。However, in recent years, power consumption in a standby state has become a problem. Although the power in the standby state is small but the duration is long, the total power consumption increases. For this reason, there is a movement to reduce the power consumption during the standby time.
【０００５】[0005]
【発明が解決しようとする課題】図５は、従来のスイッ
チング電源の別の回路構成例を示す図である。前述の待
機時の消費電力を小さく押さえるために、軽負荷状態を
狙って作った別の電源回路２７をダイオード２４を介し
て図４に示す電源回路に並列に追加接続して、軽負荷時
の効率を改善したものである。しかし、このように新た
な電源回路を追加する方式では、回路が複雑になり、外
形も大きくなり、価格も高いスイッチング電源となって
しまう問題があった。本発明の目的は、軽負荷時の効率
改善を安価に実現したスイッチング電源を提供すること
にある。FIG. 5 is a diagram showing another example of a circuit configuration of a conventional switching power supply. In order to suppress the power consumption during standby described above, another power supply circuit 27 made for light load condition is additionally connected in parallel to the power supply circuit shown in FIG. It is an improvement in efficiency. However, such a method of adding a new power supply circuit has a problem that the circuit becomes complicated, the outer shape becomes large, and the switching power supply becomes expensive. SUMMARY OF THE INVENTION An object of the present invention is to provide a switching power supply that can improve the efficiency at light load at low cost.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
に、本発明においては、負荷を監視する軽負荷検出手段
と、スイッチング電源の２次側に接続されたコンデンサ
またはバッテリと、該コンデンサまたはバッテリと負荷
との間に接続され前記軽負荷検出手段からの指令信号に
より軽負荷時にオンして負荷に電力を供給する電圧変換
手段と、前記軽負荷検出手段からの指令信号により軽負
荷時にオンして前記コンデンサまたはバッテリの充放電
量を監視し、所定の充電量でスイッチング電源の１次側
の動作を停止させ、所定の放電量でスイッチング電源の
１次側を動作させる充放電量監視手段とを具備すること
とした。In order to solve the above problems, the present invention provides a light load detecting means for monitoring a load, a capacitor or a battery connected to a secondary side of a switching power supply, and the capacitor or a battery. A voltage converter connected between a battery and a load, which is turned on at a light load by a command signal from the light load detecting means to supply power to the load, and turned on at a light load by a command signal from the light load detecting means. Charge / discharge amount monitoring means for monitoring the charge / discharge amount of the capacitor or the battery, stopping the operation of the primary side of the switching power supply at a predetermined charge amount, and operating the primary side of the switching power supply at a predetermined discharge amount It was decided to have.
【０００７】[0007]
【発明の実施の形態】図１は、本発明の第１の実施例を
示す回路構成図である。図１において、８，９，１０は
ダイオード、１１は大容量のコンデンサ、１４は充放電
量監視回路、１５は例えばＤＣ−ＤＣコンバータなどの
電圧変換回路、１６は軽負荷検出回路、１７はスイッ
チ、１９はフライバック電源であり、その他の構成要素
は図４と同じであり同じ符号を付してある。FIG. 1 is a circuit diagram showing a first embodiment of the present invention. In FIG. 1, 8, 9, and 10 are diodes, 11 is a large-capacity capacitor, 14 is a charge / discharge amount monitoring circuit, 15 is a voltage conversion circuit such as a DC-DC converter, 16 is a light load detection circuit, and 17 is a switch. , 19 are flyback power supplies, and other components are the same as those in FIG.
【０００８】破線で囲んだフライバック電源１９は、従
来から一般的に用いられているフライバック方式の電源
とほぼ同じであり、定格での電源の動作は通常用いられ
ているものと何ら変わりはない。The flyback power supply 19 surrounded by a broken line is almost the same as a flyback type power supply generally used in the past, and the operation of the rated power supply is different from that of a normally used power supply. Absent.
【０００９】スイッチ１７とダイオード８は、軽負荷動
作時に不要となる回路（例えばコンデンサ７）を切り離
すためのものである。従って、定格負荷時は、スイッチ
１７は閉じた状態で使用される。また、ＤＣ−ＤＣコン
バータ１５は動作を停止しており、充放電量監視回路１
４も動作を停止している。The switch 17 and the diode 8 are for disconnecting a circuit (for example, the capacitor 7) which becomes unnecessary at the time of light load operation. Therefore, at the time of rated load, the switch 17 is used in a closed state. The operation of the DC-DC converter 15 is stopped, and the charge / discharge amount monitoring circuit 1 is stopped.
4 also stops operating.
【００１０】軽負荷になると、先ず軽負荷検出回路１６
がこの軽負荷の状態を検出する。軽負荷検出回路１６か
らの信号によりスイッチ１７が開となり、フライバック
方式の電源１９を定格と同程度の変換電力で動作させ、
この電力でコンデンサ１１を急速に充電する。定格と同
程度の変換電力で充電を行うため、電力変換の効率の高
い領域が使用できる。軽負荷検出回路１６からの信号に
より動作する充放電量監視回路１４はこの充電の状況を
監視しており、所定の充電量になった時点でスイッチン
グ電源制御回路１３にオフ指令信号を送ってフライバッ
ク電源１９の動作を停止させる。When the load becomes light, first, the light load detection circuit 16
Detects this light load condition. The switch 17 is opened by a signal from the light load detection circuit 16, and the flyback type power supply 19 is operated with the same converted power as the rated power.
This power charges the capacitor 11 rapidly. Since charging is performed with the converted power equivalent to the rating, a region with high power conversion efficiency can be used. The charge / discharge amount monitoring circuit 14 operated by a signal from the light load detection circuit 16 monitors the state of this charge, and sends an off command signal to the switching power supply control circuit 13 at the time when the charge amount reaches a predetermined charge amount. The operation of the back power supply 19 is stopped.
【００１１】一方、軽負荷時には、軽負荷検出回路１６
からの指令信号により、ＤＣ−ＤＣコンバータ１５が動
作を開始する。このＤＣ−ＤＣコンバータ１５は、コン
デンサ１１に貯えられたエネルギーを入力として、所定
の出力電圧に変換して負荷１２に電力を供給する。On the other hand, when the load is light, the light load detection circuit 16
, The DC-DC converter 15 starts operating. The DC-DC converter 15 receives the energy stored in the capacitor 11 as an input, converts the energy into a predetermined output voltage, and supplies power to the load 12.
【００１２】その間、充放電量監視回路１４はコンデン
サ１１の放電量を監視しており、所定の放電量に達する
と、スイッチング電源制御回路１３にオン指令信号を送
ってフライバック電源１９を再度動作させ、コンデンサ
１１を急速充電する。以降、上記の動作を繰り返す。In the meantime, the charge / discharge amount monitoring circuit 14 monitors the discharge amount of the capacitor 11, and when a predetermined discharge amount is reached, sends an ON command signal to the switching power supply control circuit 13 to operate the flyback power supply 19 again. Then, the capacitor 11 is rapidly charged. Thereafter, the above operation is repeated.
【００１３】図２は、本発明の第２の実施例を示す回路
構成図である。図１との相違点は、大容量のコンデンサ
１１の代わりに充放電可能なバッテリ１８を使用してい
る点であり、回路の動作は図１と同じである。FIG. 2 is a circuit diagram showing a second embodiment of the present invention. The difference from FIG. 1 is that a chargeable / dischargeable battery 18 is used instead of the large-capacity capacitor 11, and the operation of the circuit is the same as in FIG.
【００１４】なお、エネルギー蓄積手段である大容量の
コンデンサ１１やバッテリ１８は、ＤＣ−ＤＣコンバー
タ１５を介して負荷１２に接続されるが、エネルギーを
蓄積する際の電圧は出力電圧よりも高くすることができ
る。エネルギーを蓄積する際の電圧を高くすると、特に
図１の大容量のコンデンサ１１を使用する場合には、よ
り大きなエネルギーを蓄積することが可能となる。こう
することで、フライバック電源１９の休止期間を長くす
ることが可能となる。The large-capacity capacitor 11 and the battery 18, which are energy storage means, are connected to the load 12 via the DC-DC converter 15, but the voltage for storing energy is higher than the output voltage. be able to. When the voltage at the time of storing the energy is increased, it is possible to store a larger amount of energy especially when the large-capacity capacitor 11 of FIG. 1 is used. By doing so, it is possible to lengthen the idle period of the flyback power supply 19.
【００１５】[0015]
【発明の効果】本発明によれば、ＤＣ−ＤＣコンバータ
を電圧変換回路として使用したとき、このＤＣ−ＤＣコ
ンバータは軽負荷の状態を狙って作成されるため、例え
ば９０％程度の高変換効率のものが実現可能である。従
って、従来技術でスイッチング電源の効率が定格時８０
％であったとすると、この発明によれば、 （電源の定格時効率）×（ＤＣ−ＤＣコンバータの効
率）＝約７０％ の変換効率が可能であり、従来技術の２０％程度に比べ
て大幅に効率改善を図ることが安価にできる。According to the present invention, when a DC-DC converter is used as a voltage conversion circuit, the DC-DC converter is made for a light load state, and thus has a high conversion efficiency of about 90%, for example. Is feasible. Therefore, the efficiency of the switching power supply is 80
%, A conversion efficiency of (efficiency at rated power supply) × (efficiency of DC-DC converter) = approximately 70% is possible according to the present invention. The efficiency can be improved at low cost.
【００１６】また、電圧変換回路として３端子レギュレ
ータを用いた場合、ＤＣ−ＤＣコンバータをもちいた場
合に比べて効率は落ちるが、それでも全体の効率は約５
０％程度が実現可能である。さらに、この軽負荷時に使
用される負荷が入力電圧の変動が許される場合、（例え
ば、ＬＥＤの点灯などの）新たな電圧変換回路を追加し
ないことも可能である。When a three-terminal regulator is used as the voltage conversion circuit, the efficiency is lower than when a DC-DC converter is used, but the overall efficiency is still about 5%.
About 0% is feasible. Further, when the load used at the time of light load is allowed to change the input voltage, it is also possible not to add a new voltage conversion circuit (for example, lighting of an LED).
【図１】この発明の第１の実施例を示す回路構成図。FIG. 1 is a circuit diagram showing a first embodiment of the present invention.
【図２】この発明の第２の実施例を示す回路構成図。FIG. 2 is a circuit diagram showing a second embodiment of the present invention.
【図３】従来のスイッチング電源の効率特性例を示す
図。FIG. 3 is a diagram showing an example of efficiency characteristics of a conventional switching power supply.
【図４】従来のスイッチング電源の回路構成例を示す
図。FIG. 4 is a diagram showing a circuit configuration example of a conventional switching power supply.
【図５】従来のスイッチング電源の別の回路構成例を示
す図。FIG. 5 is a diagram showing another example of a circuit configuration of a conventional switching power supply.
１…商用電源、２…ダイオードブリッジ、３，７…コン
デンサ、４…トランス、５…ＭＯＳＦＥＴ、６，８，
９，１０…ダイオード、１１…大容量コンデンサ、１２
…負荷、１３…スイッチング電源制御回路、１４…充放
電量監視回路、１５…ＤＣ−ＤＣコンバータ、１６…軽
負荷検出回路、１７…スイッチ、１８…バッテリ、１９
…フライバック電源。1: Commercial power supply, 2: Diode bridge, 3, 7: Capacitor, 4: Transformer, 5: MOSFET, 6, 8,
9, 10 ... diode, 11 ... large capacity capacitor, 12
... Load, 13 ... Switching power supply control circuit, 14 ... Charge / discharge amount monitoring circuit, 15 ... DC-DC converter, 16 ... Light load detection circuit, 17 ... Switch, 18 ... Battery, 19
… Flyback power supply.
Claims (1)
チング電源の２次側に接続されたコンデンサまたはバッ
テリと、該コンデンサまたはバッテリと負荷との間に接
続され前記軽負荷検出手段からの指令信号により軽負荷
時にオンして負荷に電力を供給する電圧変換手段と、前
記軽負荷検出手段からの指令信号により軽負荷時にオン
して前記コンデンサまたはバッテリの充放電量を監視
し、所定の充電量でスイッチング電源の１次側の動作を
停止させ、所定の放電量でスイッチング電源の１次側を
動作させる充放電量監視手段とを具備したことを特徴と
するスイッチング電源。1. A light load detecting means for monitoring a load, a capacitor or a battery connected to a secondary side of a switching power supply, and a command from the light load detecting means connected between the capacitor or the battery and the load. A voltage conversion unit that is turned on at a light load by a signal to supply power to the load, and is turned on at a light load by a command signal from the light load detection unit to monitor the charge / discharge amount of the capacitor or the battery, and a predetermined charge And a charge / discharge amount monitoring means for stopping the operation of the primary side of the switching power supply at a predetermined amount and operating the primary side of the switching power supply at a predetermined discharge amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05641399A JP3591361B2 (en) | 1999-03-04 | 1999-03-04 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05641399A JP3591361B2 (en) | 1999-03-04 | 1999-03-04 | Switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000253662A true JP2000253662A (en) | 2000-09-14 |
| JP3591361B2 JP3591361B2 (en) | 2004-11-17 |
Family
ID=13026465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05641399A Expired - Fee Related JP3591361B2 (en) | 1999-03-04 | 1999-03-04 | Switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3591361B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002218753A (en) * | 2001-01-16 | 2002-08-02 | Ohira Denshi Kk | Switching power supply unit |
-
1999
- 1999-03-04 JP JP05641399A patent/JP3591361B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002218753A (en) * | 2001-01-16 | 2002-08-02 | Ohira Denshi Kk | Switching power supply unit |
| JP4644950B2 (en) * | 2001-01-16 | 2011-03-09 | 大平電子株式会社 | Switching power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3591361B2 (en) | 2004-11-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9570930B2 (en) | UPS electricity supply control circuit and UPS electricity supply | |
| US8314593B2 (en) | Power-saving line interactive uninterruptible power system | |
| JPH11191424A (en) | Operating method for fuel cell generating device | |
| US11121554B2 (en) | Electrical power control apparatus, electrical power control method and electrical power control system | |
| JP2002510460A (en) | Flyback converter with limited output power | |
| JP2001177995A (en) | Hybrid power supply system | |
| JP3591361B2 (en) | Switching power supply | |
| JP2004129337A (en) | Uninterruptible power supply | |
| JPH05168160A (en) | Ac/dc converter system | |
| US8493015B2 (en) | Door drive | |
| JP3446773B2 (en) | Uninterruptible power system | |
| JP3910725B2 (en) | Power system | |
| JP2000224779A (en) | Uninterruptible power supply | |
| JPH02269426A (en) | Dc uninterruptible power supply unit | |
| CN218940750U (en) | Off-line uninterrupted power supply | |
| CN217693117U (en) | Starting circuit, voltage conversion circuit and electronic equipment | |
| JP2002281693A (en) | Power storage system | |
| JP2004343850A (en) | Charging system | |
| CN220692989U (en) | Power supply management circuit, switching power supply circuit and switching power supply controller | |
| CN220934897U (en) | Power supply circuit of battery discharge control chip | |
| JPH09308135A (en) | Backup device at power failure | |
| JPH09130995A (en) | Uninterruptive power supply | |
| JPH0750850Y2 (en) | Power storage battery power converter | |
| US20230246478A1 (en) | Backup power supply device and method for controlling backup power supply device | |
| JP3350270B2 (en) | Switching power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20031225 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20040510 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20040518 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20040803 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20040816 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070903 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080903 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080903 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090903 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090903 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100903 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100903 Year of fee payment: 6 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100903 Year of fee payment: 6 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110903 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110903 Year of fee payment: 7 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110903 Year of fee payment: 7 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110903 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120903 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120903 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130903 Year of fee payment: 9 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |