JP3973747B2 - Switching power supply - Google Patents
Switching power supply Download PDFInfo
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- JP3973747B2 JP3973747B2 JP35749897A JP35749897A JP3973747B2 JP 3973747 B2 JP3973747 B2 JP 3973747B2 JP 35749897 A JP35749897 A JP 35749897A JP 35749897 A JP35749897 A JP 35749897A JP 3973747 B2 JP3973747 B2 JP 3973747B2
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- Prior art keywords
- voltage
- power supply
- circuit
- rectifying
- switching
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Description
【０００１】
【発明の属する技術分野】
本発明は、スイッチング電源装置に係り、特に、保護回路動作時に間欠発振の状態になるスイッチング電源装置に関する。
【０００２】
【従来の技術】
従来のスイッチング電源装置は、図２に示すように、交流電源１と、この交流電源１の供給／停止を行なうスイッチＳＷと、このスイッチＳＷで供給された交流電源１を整流平滑して出力電圧を出力する整流平滑回路１０３と、この整流平滑回路１０３から出力された出力電圧をスイッチングして直流電圧を生成するスイッチング回路２と、このスイッチング回路２を制御する制御ＩＣ８と、この制御ＩＣ８の起動電圧を出力電圧から生成する起動抵抗Ｒ及びコンデンサＣとで構成され、整流平滑回路１０３から出力された出力電圧を起動抵抗ＲでコンデンサＣに充電し、その充電電圧が制御ＩＣ８の起動開始電圧に到達した時に、制御ＩＣ８が発振を開始してスイッチング動作するため、負荷短絡等の保護回路が働いた時の間欠発振の周期は、起動抵抗ＲとコンデンサＣとの時定数で決まっていた。
【０００３】
【発明が解決しようとする課題】
従来のスイッチング電源装置は、制御ＩＣの起動時間を早くすると、負荷短絡等の保護回路が働いた時の間欠発振の周期が短くなり、出力側の整流ダイオードやチョークコイルに多大なストレスがかかり、電流定格の大きい部品を必要とする課題があった。
【０００４】
そこで、本発明の目的は、制御ＩＣの起動開始時間を早くし、かつ間欠発振の周期を長くするスイッチング電源装置を提供することにある。
【０００５】
【課題を解決するための手段】
上述の課題を解決するために、本発明のスイッチング電源装置は、交流電源と、この交流電源を整流平滑して第１電圧を出力し、かつ上記交流電源に接続された第１整流平滑回路と、上記交流電源の供給／停止を行なうスイッチと、このスイッチで供給された上記交流電源を整流平滑して第２電圧及び第３電圧を各々出力する第２整流平滑回路及び第３整流平滑回路と、この第２整流平滑回路から出力された第２電圧をスイッチングして直流電圧を生成するスイッチング回路と、このスイッチング回路を制御する制御ＩＣと、この制御ＩＣの起動電圧を上記第２電圧から生成する起動抵抗及びコンデンサと、この起動抵抗及びコンデンサで生成された起動電圧より低いレギュレート電圧を上記第１整流平滑回路から生成して上記コンデンサを充電するレギュレータ回路と、このレギュレータ回路を停止するリセット電圧を上記第３電圧から生成するリセット回路とで構成されたことを特徴とする。
また、本発明のスイッチング電源装置は、前記スイッチがオンになった場合に、前記第２整流平滑回路が出力する第２電圧により前記起動抵抗を通して前記コンデンサを充電し、前記コンデンサの電圧が前記制御ＩＣの起動開始電圧に到達したときに、前記制御ＩＣが発振を開始する。
【０００６】
【発明の実施の形態】
次に、本発明の一実施の形態によるスイッチング電源装置を図面を参照して説明する。
【０００７】
図１は、本発明の一実施の形態によるスイッチング電源装置のブロック構成図である。
【０００８】
本発明の一実施の形態によるスイッチング電源装置は、図１に示すように、交流電源１と、この交流電源１を整流平滑して第１電圧を出力し、かつ交流電源１に接続された第１整流平滑回路４と、交流電源１の供給／停止を行なうスイッチＳＷと、このスイッチＳＷで供給された交流電源１を整流平滑して第２電圧及び第３電圧を各々出力する第２整流平滑回路３及び第３整流平滑回路４と、この第２整流平滑回路３から出力された第２電圧をスイッチングして直流電圧を生成するスイッチング回路２と、このスイッチング回路２を制御する制御ＩＣ８と、この制御ＩＣ８の起動電圧を第２電圧から生成する起動抵抗Ｒ及びコンデンサＣと、この起動抵抗Ｒ及びコンデンサＣで生成された起動電圧より低いレギュレート電圧を第１整流平滑回路４から生成するレギュレータ回路６と、このレギュレータ回路６を停止するリセット電圧を第３電圧から生成するリセット回路７とで構成される。
【０００９】
次に、本発明の一実施の形態によるスイッチング電源装置の動作を図面を参照して説明する。
【００１０】
本発明の一実施の形態によるスイッチング電源装置の動作は、図１に示すように、交流電圧１をスイッチＳＷがオンする前に第１整流平滑回路４で第１電圧を作り、この第１電圧をレギュレータ回路６で制御ＩＣ８の起動開始電圧より低い電圧をコンデンサＣに充電しておき、スイッチＳＷがオンすると、第２整流平滑回路３で作られた第２電圧を起動抵抗Ｒを通してコンデンサＣに充電し、この起動抵抗Ｒからの充電によってコンデンサＣの電圧が、制御ＩＣ８の起動開始電圧に到達し、制御ＩＣ８は発振を開始してスイッチＳＷがオンすると、第３整流平滑回路５で作られた第３電圧によってリセット回路７を動作させ、レギュレータ回路６の動作を停止させる。
【００１１】
【発明の効果】
以上説明したように、本発明のスイッチング電源装置によれば、スイッチオン前に制御ＩＣに起動開始電圧より低い電圧を既に供給しているため、スイッチオン後に制御ＩＣの起動開始電圧までの充電時間は短くて済み、起動抵抗の抵抗値を大きくしても起動時間は遅くならず、かつスイッチオン後にレギュレータ回路を止めてしまうことから、負荷短絡等の間欠発振時は起動抵抗の抵抗値を大きくすることができ、間欠発振の周期を長くできるので、出力側の整流ダイオードやチョークコイルを電流定格の小さい部品にできる効果がある。
【図面の簡単な説明】
【図１】本発明の一実施の形態によるスイッチング電源装置のブロック構成図である。
【図２】従来のスイッチング電源装置のブロック構成図である。
【符号の説明】
１ 交流電源
２ スイッチング回路
３ 第２整流平滑回路
４ 第１整流平滑回路
５ 第３整流平滑回路
６ レギュレータ回路
７ リセット回路
８ 制御ＩＣ
Ｒ 起動抵抗
Ｃ コンデンサ
ＳＷ スイッチ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a switching power supply device, and more particularly, to a switching power supply device that enters an intermittent oscillation state when a protection circuit operates.
[0002]
[Prior art]
As shown in FIG. 2, the conventional switching power supply device rectifies and smoothes the AC power supply 1, the switch SW for supplying / stopping the AC power supply 1, and the AC power supply 1 supplied by the switch SW to output voltage. , A switching circuit 2 that generates a DC voltage by switching the output voltage output from the rectifying and smoothing circuit 103, a control IC 8 that controls the switching circuit 2, and activation of the control IC 8 The output voltage output from the rectifying / smoothing circuit 103 is charged to the capacitor C by the start resistor R, and the charge voltage becomes the start start voltage of the control IC 8. Since the control IC 8 starts to oscillate when it reaches the switching operation, the period of intermittent oscillation when a protective circuit such as a load short circuit is activated It was determined by the time constant of the starting resistor R and a capacitor C.
[0003]
[Problems to be solved by the invention]
In the conventional switching power supply device, if the start-up time of the control IC is shortened, the period of intermittent oscillation when a protective circuit such as a load short circuit is activated is shortened, and a large amount of stress is applied to the rectifier diode and choke coil on the output side. There was a problem that required parts with large ratings.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a switching power supply device that increases the start time of starting a control IC and lengthens the period of intermittent oscillation.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problem, a switching power supply apparatus according to the present invention includes an AC power supply, a first rectifying / smoothing circuit that outputs a first voltage by rectifying and smoothing the AC power supply, and connected to the AC power supply. A switch for supplying / stopping the AC power, and a second rectifying / smoothing circuit and a third rectifying / smoothing circuit for rectifying and smoothing the AC power supplied by the switch and outputting a second voltage and a third voltage, respectively. A switching circuit that generates a DC voltage by switching the second voltage output from the second rectifying and smoothing circuit, a control IC that controls the switching circuit, and a starting voltage for the control IC is generated from the second voltage. start a resistor and a capacitor to, the capacitor generates a lower regulated voltage than the starting voltage generated in the starting resistor and a capacitor from said first rectifying and smoothing circuit A regulator circuit for electricity, a reset voltage to stop the regulator circuit, characterized in that it is composed of a reset circuit for generating from said third voltage.
In the switching power supply device of the present invention, when the switch is turned on, the capacitor is charged through the starting resistor by the second voltage output from the second rectifying and smoothing circuit, and the voltage of the capacitor is controlled by the control voltage. When the IC start-up voltage is reached, the control IC starts to oscillate.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, a switching power supply device according to an embodiment of the present invention will be described with reference to the drawings.
[0007]
FIG. 1 is a block diagram of a switching power supply device according to an embodiment of the present invention.
[0008]
As shown in FIG. 1, a switching power supply according to an embodiment of the present invention includes an AC power supply 1, a first voltage that is rectified and smoothed from the AC power supply 1, and is connected to the AC power supply 1. 1 rectifying / smoothing circuit 4, switch SW for supplying / stopping AC power supply 1, and second rectifying / smoothing that rectifies and smoothes AC power supply 1 supplied by switch SW and outputs a second voltage and a third voltage, respectively. A circuit 3 and a third rectifying / smoothing circuit 4, a switching circuit 2 for generating a DC voltage by switching the second voltage output from the second rectifying / smoothing circuit 3, a control IC 8 for controlling the switching circuit 2, A starting resistor R and a capacitor C that generate the starting voltage of the control IC 8 from the second voltage, and a regulated voltage lower than the starting voltage generated by the starting resistor R and the capacitor C are supplied to the first rectifying and smoothing circuit. A regulator circuit 6 for generating from 4, and a reset circuit 7 for generating a reset voltage to stop the regulator circuit 6 from the third voltage.
[0009]
Next, the operation of the switching power supply device according to the embodiment of the present invention will be described with reference to the drawings.
[0010]
As shown in FIG. 1, the operation of the switching power supply device according to the embodiment of the present invention is to create a first voltage in the first rectifying / smoothing circuit 4 before the switch SW is turned on. The regulator circuit 6 charges the capacitor C with a voltage lower than the starting start voltage of the control IC 8, and when the switch SW is turned on, the second voltage generated by the second rectifying and smoothing circuit 3 is supplied to the capacitor C through the starting resistor R. When charging is performed from the starting resistor R, the voltage of the capacitor C reaches the starting start voltage of the control IC 8. When the control IC 8 starts oscillation and the switch SW is turned on, the third rectifying and smoothing circuit 5 generates the voltage. The reset circuit 7 is operated by the third voltage, and the operation of the regulator circuit 6 is stopped.
[0011]
【The invention's effect】
As described above, according to the switching power supply device of the present invention, since the voltage lower than the start-up voltage is already supplied to the control IC before the switch is turned on, the charging time until the start-up voltage of the control IC is turned on after the switch is turned on. The start-up time does not slow down even if the resistance value of the starting resistor is increased, and the regulator circuit is stopped after the switch is turned on, so the resistance value of the starting resistor is increased during intermittent oscillation such as a load short circuit. Since the period of intermittent oscillation can be increased, the output side rectifier diode and choke coil can be made into parts having a small current rating.
[Brief description of the drawings]
FIG. 1 is a block diagram of a switching power supply device according to an embodiment of the present invention.
FIG. 2 is a block diagram of a conventional switching power supply device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 AC power supply 2 Switching circuit 3 2nd rectification smoothing circuit 4 1st rectification smoothing circuit 5 3rd rectification smoothing circuit 6 Regulator circuit 7 Reset circuit 8 Control IC
R Starting resistor C Capacitor SW switch
Claims (2)
この交流電源を整流平滑して第１電圧を出力し、かつ上記交流電源に接続された第１整流平滑回路と、
上記交流電源の供給／停止を行なうスイッチと、
このスイッチで供給された上記交流電源を整流平滑して第２電圧及び第３電圧を各々出力する第２整流平滑回路及び第３整流平滑回路と、
この第２整流平滑回路から出力された第２電圧をスイッチングして直流電圧を生成するスイッチング回路と、
このスイッチング回路を制御する制御ＩＣと、
この制御ＩＣの起動電圧を上記第２電圧から生成する起動抵抗及びコンデンサと、
この起動抵抗及びコンデンサで生成された起動電圧より低いレギュレート電圧を上記第１整流平滑回路から生成して上記コンデンサを充電するレギュレータ回路と、
このレギュレータ回路を停止するリセット電圧を上記第３電圧から生成するリセット回路と
で構成されたことを特徴とするスイッチング電源装置。AC power supply,
Rectifying and smoothing the AC power supply to output a first voltage and connected to the AC power supply;
A switch for supplying / stopping the AC power supply;
A second rectifying / smoothing circuit and a third rectifying / smoothing circuit for outputting the second voltage and the third voltage by rectifying and smoothing the AC power supplied by the switch;
A switching circuit that generates a DC voltage by switching the second voltage output from the second rectifying and smoothing circuit;
A control IC for controlling the switching circuit;
A starting resistor and a capacitor for generating a starting voltage of the control IC from the second voltage;
A regulator circuit that generates a regulated voltage lower than the starting voltage generated by the starting resistor and the capacitor from the first rectifying and smoothing circuit and charges the capacitor ;
A switching power supply device comprising: a reset circuit for generating a reset voltage for stopping the regulator circuit from the third voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35749897A JP3973747B2 (en) | 1997-12-25 | 1997-12-25 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35749897A JP3973747B2 (en) | 1997-12-25 | 1997-12-25 | Switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11191959A JPH11191959A (en) | 1999-07-13 |
| JP3973747B2 true JP3973747B2 (en) | 2007-09-12 |
Family
ID=18454438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35749897A Expired - Fee Related JP3973747B2 (en) | 1997-12-25 | 1997-12-25 | Switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3973747B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005332209A (en) * | 2004-05-20 | 2005-12-02 | Rohm Co Ltd | Semiconductor integrated circuit device, and portable equipment using the same |
| WO2023157672A1 (en) * | 2022-02-16 | 2023-08-24 | パナソニックＩｐマネジメント株式会社 | Power generation device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02261049A (en) * | 1988-12-13 | 1990-10-23 | Murata Mfg Co Ltd | Switching regulator |
| JPH0654533A (en) * | 1992-07-24 | 1994-02-25 | Matsushita Electric Works Ltd | Power supply apparatus |
| JPH09308250A (en) * | 1996-05-14 | 1997-11-28 | Pfu Ltd | Power supply |
-
1997
- 1997-12-25 JP JP35749897A patent/JP3973747B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11191959A (en) | 1999-07-13 |
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