JPH11215819A - Switching power unit saving power at standby - Google Patents
Switching power unit saving power at standbyInfo
- Publication number
- JPH11215819A JPH11215819A JP10044182A JP4418298A JPH11215819A JP H11215819 A JPH11215819 A JP H11215819A JP 10044182 A JP10044182 A JP 10044182A JP 4418298 A JP4418298 A JP 4418298A JP H11215819 A JPH11215819 A JP H11215819A
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- Prior art keywords
- transistor
- base
- switch element
- circuit
- voltage
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はスイッチング電源装置に
関し、特に待機時の消費電力を減ずる回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching power supply, and more particularly to a circuit for reducing power consumption during standby.
【０００２】[0002]
【従来の技術】リンギングチョークコンバータ型のスイ
ッチング電源の待機時の消費電力を減ずる回路として、
従来は図３に示すような回路が用いられていた。この回
路は、待機回路だけが電力を消費するときに、待機回路
に供給される電圧に対してより高い他の出力電圧を待機
回路が必要とする電圧まで下げて、その下がった電圧を
トランジスタスイッチ回路によって待機回路に供給する
方法を用いている。2. Description of the Related Art As a circuit for reducing power consumption during standby of a ringing choke converter type switching power supply,
Conventionally, a circuit as shown in FIG. 3 has been used. This circuit reduces the other output voltage higher than the voltage supplied to the standby circuit to a voltage required by the standby circuit when only the standby circuit consumes power, and reduces the reduced voltage to a transistor switch. A method of supplying a signal to a standby circuit by a circuit is used.
【０００３】リンギングチョークコンバータは自励式で
あり、その発振周波数ｆは、入力電圧と出力電圧を各々
Ｖ１とＶ２、１次巻線と２次巻線の巻数を各々ｎ１とｎ
２、１次巻線のインダクタンスをＬ１、入力電力をＰ１
とすると、数１で表すことができる。The ringing choke converter is a self-excited type, and its oscillation frequency f is determined by changing the input voltage and the output voltage to V1 and V2, respectively, and the number of turns of the primary winding and the secondary winding to n1 and n, respectively.
2. The inductance of the primary winding is L1, and the input power is P1.
Then, it can be expressed by Equation 1.
【０００４】[0004]
【数１】 (Equation 1)
【０００５】数１が示すように、負荷が軽くなってＰ１
が小さくなる程発振周波数が高くなる。そして、スイッ
チングロスが増える。しかし、出力電圧Ｖ２を下げるこ
とによって発振周波数が下がるので、待機回路だけが電
力を消費する負荷の軽いときに、出力電圧を下げること
によって発振周波数の上昇を抑えることができ、これに
よってスイッチングロスの増加をある程度抑えることが
できる。[0005] As shown in Equation 1, the load is reduced and P1
Becomes smaller, the oscillation frequency becomes higher. Then, switching loss increases. However, since the oscillation frequency is reduced by lowering the output voltage V2, when only the standby circuit consumes light power, the increase in the oscillation frequency can be suppressed by lowering the output voltage, thereby reducing the switching loss. The increase can be suppressed to some extent.
【０００６】[0006]
【発明が解決しようとする課題】ノイズを小さくするた
めにスイッチ素子に並列にスナバコンデンサが接続され
ているリンギングチョークコンバータにおいて、スイッ
チ素子のオフ期間にスナバコンデンサに充電される電圧
は、入力電圧に１次巻線のフライバック電圧を足した値
になる。スイッチ素子のオフ期間にトランスの励磁エネ
ルギーが放出しきると、スナバコンデンサの電圧が入力
電圧より高くなるため、この差の電圧であるフライバッ
ク電圧を振幅とする共振現象が生じる。もし、スイッチ
素子を共振の開始より半周期遅れてターンオンさせるこ
とができれば、スナバコンデンサの電圧が入力電圧から
１次巻線のフライバック電圧を引いた値になったときに
ターンオンし、スナバコンデンサの放電によるスイッチ
素子内のロス（ターンオンロス）を小さくできる。本出
願人はこの原理を応用した自励式スイッチング電源のソ
フトスイッチ回路を提供している（登録第２５６０２０
８号）。In a ringing choke converter in which a snubber capacitor is connected in parallel with a switch element to reduce noise, the voltage charged in the snubber capacitor during the off period of the switch element is equal to the input voltage. It becomes a value obtained by adding the flyback voltage of the primary winding. When the excitation energy of the transformer is completely released during the off period of the switch element, the voltage of the snubber capacitor becomes higher than the input voltage, and a resonance phenomenon occurs in which the flyback voltage, which is the difference voltage, is used as an amplitude. If the switch element can be turned on with a half cycle delay from the start of resonance, it turns on when the voltage of the snubber capacitor becomes a value obtained by subtracting the flyback voltage of the primary winding from the input voltage, and the snubber capacitor is turned on. Loss (turn-on loss) in the switch element due to discharge can be reduced. The present applicant provides a soft switch circuit of a self-excited switching power supply applying this principle (registered 256020).
No. 8).
【０００７】図３に示した従来方式は、出力電圧を下げ
る方式であるため、１次巻線のフライバック電圧も下が
る。スナバコンデンサが使われていれば、共振の振幅が
小さくなるので、仮にスイッチ素子のターンオンのタイ
ミングを共振開始の半周期後に合わせても、スナバコン
デンサの電圧の下がりきったところの電圧そのものが小
さくならず、ターンオンロスを小さくすることができな
い。すなわち、図３の従来方式はスナバコンデンサを用
いてソフトスイッチ化したリンギングチョークコンバー
タには向いていない。そこで本発明は、スナバコンデン
サを用いるリンギングチョークコンバータにも応用でき
る待機時の入力電力を小さくする回路を提供することを
目的としている。[0007] Since the conventional method shown in FIG. 3 is a method for lowering the output voltage, the flyback voltage of the primary winding also decreases. If a snubber capacitor is used, the amplitude of the resonance will be small, so even if the turn-on timing of the switch element is adjusted half a cycle after the start of resonance, if the voltage itself at the point where the voltage of the snubber capacitor has dropped is small, Therefore, the turn-on loss cannot be reduced. That is, the conventional system shown in FIG. 3 is not suitable for a ringing choke converter which is soft-switched using a snubber capacitor. Therefore, an object of the present invention is to provide a circuit that can be applied to a ringing choke converter using a snubber capacitor and that reduces input power during standby.
【０００８】[0008]
【課題を解決するための手段】上の目的を達成するため
に本発明は、待機回路だけが電力を消費するときは、ス
イッチングを連続動作から間欠動作に変え、かつ、間欠
動作によって生じやすいトランスの音を抑えるために、
スイッチ素子を流れる電流の包絡線を正弦波状に近い形
にした。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for switching from continuous operation to intermittent operation when only a standby circuit consumes power, and a transformer which is apt to be caused by intermittent operation. In order to suppress the sound of
The envelope of the current flowing through the switch element was shaped like a sine wave.
【０００９】[0009]
【作用】スイッチング電源の効率は負荷が小さくなるに
従って低くなる。そこで、待機時の電力より大きい電力
を間欠的に供給する方が連続的に供給するより高い効率
を得ることができる。The efficiency of the switching power supply decreases as the load decreases. Therefore, it is possible to obtain higher efficiency by intermittently supplying power larger than the power in the standby state than by continuously supplying power.
【００１０】間欠発振はトランスから音が発するという
問題点を含んでいるが、音の原因はトランスの１次巻線
を流れるスイッチング電流の包絡線の形と関係が強い。
スイッチングの波と包絡線が作る波の合成波のスペクト
ラム分布は、数＋ＫＨｚのスイッチング周波数を中心に
して、上下両方向に広がる。包絡線の形が矩形波であれ
ば、スペクトラムはスイッチング周波数を中心に上下両
方向にかなり広がり、可聴周波数にまで及ぶが、包絡線
が数ＫＨｚ以下の正弦波に近い形であれば、スペクトラ
ムの広がりが小さく可聴範囲に及ばなくなり、トランス
の音が聞こえなくなる。The intermittent oscillation has a problem that sound is emitted from the transformer, but the cause of the sound is strongly related to the shape of the envelope of the switching current flowing through the primary winding of the transformer.
The spectrum distribution of the composite wave of the switching wave and the wave formed by the envelope spreads both up and down around the switching frequency of several + KHz. If the shape of the envelope is a rectangular wave, the spectrum spreads significantly up and down around the switching frequency and extends to the audible frequency, but if the envelope is close to a sine wave of several KHz or less, the spectrum spreads. Is too small to reach the audible range and the sound of the trance cannot be heard.
【００１１】[0011]
【実施例】図１は本発明の実施例に係る省電力スイッチ
ング電源装置を示す回路図である。図において、スイッ
チ回路８は待機回路２７だけが電力を消費するときにオ
フになる。このスイッチ回路８がオフのとき第１のトラ
ンジスタ４はオン状態になる。リニアレギュレータ２５
の入力電圧が定電圧ダイオード３の降伏電圧とフォトカ
プラ発光素子１の順方向電圧の和より大きいとき、発光
素子１が発光し、受光素子２はオン状態となり、スイッ
チ素子１６はゲート電荷が受光素子２と第２のトランジ
スタ９によって放電するのでオフになる。起動抵抗１７
を流れる電流も受光素子２と第２のトランジスタ９を流
れるのでオフが続き、発振停止状態になる。発振停止の
間も待機回路２７によって電力が消費されるので、リニ
アレギュレータ２５の入力電圧が下がり、やがて発光素
子１を流れる電流がゼロになって受光素子２はオフにな
る。これによって起動抵抗１７の電流は、第１のコンデ
ンサ１８とスイッチ素子１６のゲートの充電を開始し、
スイッチ素子１６のケート電圧がスレッショルド電圧に
達すると、スイッチ素子１６はごく短いオン期間の発振
を開始する。スイッチ素子１６の最初のターンオンによ
って電荷が放出された第１のコンデンサ１８は、スイッ
チ素子１６のオフ期間に再び充電されるが、オフ期間も
短いため充電々圧がいきなり大きくなることはなく、オ
ンオフの繰り返しと共に上昇する。FIG. 1 is a circuit diagram showing a power-saving switching power supply according to an embodiment of the present invention. In the figure, the switch circuit 8 is turned off when only the standby circuit 27 consumes power. When the switch circuit 8 is off, the first transistor 4 is turned on. Linear regulator 25
Is larger than the sum of the breakdown voltage of the constant voltage diode 3 and the forward voltage of the photocoupler light emitting element 1, the light emitting element 1 emits light, the light receiving element 2 is turned on, and the switch element 16 receives the gate charge. It is turned off because the element 2 and the second transistor 9 discharge. Starting resistance 17
Is also flowing through the light receiving element 2 and the second transistor 9, so that the current is kept off and the oscillation is stopped. Since power is consumed by the standby circuit 27 even during the stop of the oscillation, the input voltage of the linear regulator 25 decreases, and eventually the current flowing through the light emitting element 1 becomes zero and the light receiving element 2 is turned off. As a result, the current of the starting resistor 17 starts charging the first capacitor 18 and the gate of the switch element 16,
When the gate voltage of the switch element 16 reaches the threshold voltage, the switch element 16 starts oscillating for a very short ON period. The first capacitor 18 whose charge has been released by the first turn-on of the switch element 16 is charged again during the off-period of the switch element 16, but since the off-period is also short, the charged voltage does not suddenly increase. Rise with the repetition of.
【００１２】第１のコンデンサ１８の電圧が大きくなる
とオン期間も長くなるが、オン期間の間に第３のコンデ
ンサ１０の電圧は正帰還巻線１５の電圧が第３の抵抗１
１を介して加わるために上昇し、やがて第２のトランジ
スタ９をオン状態にする。そして、スイッチ素子１６は
ターンオフする。As the voltage of the first capacitor 18 increases, the on-period also increases, but during the on-period, the voltage of the third capacitor 10 is reduced by the voltage of the positive feedback winding 15 to the third resistor 1.
It rises to be applied via 1 and eventually turns on the second transistor 9. Then, the switch element 16 turns off.
【００１３】スイッチ素子１６のオフ期間には、第３の
コンデンサ１０は正帰還巻線１５の負の電圧によって充
電されるが、負の電圧は出力電圧に正比例するため、出
力電圧の上昇と共に絶対値が大きくなる。During the OFF period of the switch element 16, the third capacitor 10 is charged by the negative voltage of the positive feedback winding 15, but the negative voltage is directly proportional to the output voltage. The value increases.
【００１４】第３のコンデンサ１０の負の電圧の絶対値
が大きくなる程、スイッチ素子１６がターンオンしてか
ら、第３のコンデンサ１０の電圧が第２のトランジスタ
９をオン状態にする電圧に達するまでの時間が長くな
り、その結果スイッチ素子１６のオン期間が長くなる。As the absolute value of the negative voltage of the third capacitor 10 increases, the voltage of the third capacitor 10 reaches a voltage that turns on the second transistor 9 after the switching element 16 is turned on. The on-time of the switch element 16 becomes longer as a result.
【００１５】スイッチ素子１６のオン期間が長くなるに
従って出力電圧が上昇するが、やがて定電圧ダイオード
３の降伏電圧と発光素子１の順方向電圧の和に達すると
発光素子１に電流が流れ始め、受光素子２であるフォト
トランジスタは遮断領域から能動領域に入りコレクタ・
エミッタ間飽和電圧が下がり始める。これによってスイ
ッチ素子１６のゲート電圧が下がり始め、オン期間が小
さくなり始める。The output voltage increases as the ON period of the switch element 16 increases, but when the breakdown voltage of the constant voltage diode 3 reaches the sum of the forward voltage of the light emitting element 1, a current starts flowing through the light emitting element 1, The phototransistor which is the light receiving element 2 enters the active region from the cutoff region and has a collector.
The saturation voltage between the emitters starts to decrease. As a result, the gate voltage of the switch element 16 starts to decrease, and the ON period starts to decrease.
【００１６】発光素子１の電流が上昇するためには第１
のトランジスタのコレクタ電流が増えなければならな
い。コレクタ電流の上昇はベース・エミッタ間飽和電圧
の上昇にともなっているが第２のコンデンサ６が第１の
トランジスタ４のベース・エミッタ間飽和電圧の上昇を
遅らせる。その遅れの間は、第１のトランジスタ４は完
全に飽和領域に入れず、発光素子１の電流が受光素子２
を完全にオン状態にするまでの大きさに達しない。その
ためスイッチ素子１６は序々に短いオン期間になってい
くが発振を継続し、出力電圧は上昇を続ける。第２のコ
ンデンサ６による遅延時間は、第２のコンデンサ６の容
量と第２の抵抗７の値、及びこれらに直流電流を供給す
る抵抗５の値によって決まる。In order for the current of the light emitting element 1 to increase, the first
The collector current of the transistor must increase. Although the rise of the collector current is accompanied by the rise of the base-emitter saturation voltage, the second capacitor 6 delays the rise of the base-emitter saturation voltage of the first transistor 4. During that delay, the first transistor 4 does not completely enter the saturation region, and the current of the light emitting element 1
Does not reach the size required to completely turn on. As a result, the switch element 16 gradually starts to turn on for a short period of time, but continues to oscillate, and the output voltage continues to rise. The delay time of the second capacitor 6 is determined by the capacitance of the second capacitor 6, the value of the second resistor 7, and the value of the resistor 5 that supplies a direct current to these.
【００１７】第１のトランジスタ４が完全に飽和領域に
入りオン状態になると、受光素子２も完全にオン状態と
なって、スイッチ素子１６は発振を停止する。このとき
リニアレギュレータ２５の入力電圧は定電圧ダイオード
３の降伏電圧と発光素子１の順方向電圧の和を超えて上
昇しているため、この電圧が待機回路２７に流れる電流
によって下がり、発光素子１の電流がゼロになるまで発
振停止は続く。When the first transistor 4 completely enters the saturation region and is turned on, the light receiving element 2 is also completely turned on, and the switch element 16 stops oscillating. At this time, since the input voltage of the linear regulator 25 has risen beyond the sum of the breakdown voltage of the constant voltage diode 3 and the forward voltage of the light emitting element 1, this voltage decreases due to the current flowing through the standby circuit 27, and Oscillation stop continues until the current of becomes zero.
【００１８】スイッチ素子１６の電流は図２に示したよ
うにゼロから序々に大きくなり、再び序々にゼロまで小
さくなるので、電流の包形波は正弦波に近くなりトラン
スの音は人の耳に聞き取りにくい。Since the current of the switching element 16 gradually increases from zero as shown in FIG. 2 and gradually decreases to zero again, the envelope of the current is close to a sine wave, and the sound of the transformer is a human ear. Hard to hear.
【００１９】このようにして、スイッチ素子１６の発振
と発振停止が繰り返される。スイッチ素子１６の電流が
最も大きくなるなるときの出力電力は、待機回路２７が
必要とする電力より大きく、瞬時的な効率が高いので、
平均した効率は、待機回路２７が必要な電力を連続的に
出力するときの効率より高くなる。In this way, the oscillation of the switch element 16 and the oscillation stop are repeated. Since the output power when the current of the switch element 16 becomes the largest is larger than the power required by the standby circuit 27 and the instantaneous efficiency is high,
The average efficiency is higher than the efficiency when the standby circuit 27 continuously outputs the required power.
【００２０】リニアレギュレータ２５の入力電圧は、ス
イッチ素子１６の発振の期間に上昇し停止期間に下降す
るので比較的大きいリップルを含むが、リニアレギュレ
ータ２５の出力電圧はフラットな定電圧となって待機回
路２７に供給される。The input voltage of the linear regulator 25 rises during the oscillation period of the switch element 16 and falls during the stop period, and therefore includes a relatively large ripple. However, the output voltage of the linear regulator 25 becomes a flat constant voltage and waits. The signal is supplied to the circuit 27.
【００２１】図１の実施例では第２のトランジスタ９が
スイッチ回路８がオフ状態のときだけ働く部品になって
いるが、スイッチ素子１６の制御電極に接続されている
ので、スイッチ回路８がオン状態のときに、出力電圧を
一定にするための発振制御回路の一部として働かすこと
も可能である。In the embodiment shown in FIG. 1, the second transistor 9 is a component that works only when the switch circuit 8 is off. However, since the second transistor 9 is connected to the control electrode of the switch element 16, the switch circuit 8 is turned on. In the state, it is possible to function as a part of the oscillation control circuit for keeping the output voltage constant.
【００２２】[0022]
【発明の効果】リンギングチョークコンバータは負荷が
軽くなると、発振周波数が高くなるために効率が低下す
る。本発明は間欠発振を生じさせることによって、発振
周波数の上昇を抑え、効率の低下を防いだ。そして、ト
ランスから音が発しやすいという間欠発振の短所を、ト
ランス１次巻線に流れる電流の包絡線が正弦波に近い形
をとるようにした。それらの機能をごくわずかな部品の
追加で可能にしたので経済的効果が大きい。As described above, when the load of the ringing choke converter is reduced, the oscillation frequency is increased and the efficiency is reduced. The present invention suppresses a rise in the oscillation frequency and prevents a decrease in efficiency by causing intermittent oscillation. The disadvantage of intermittent oscillation, in which sound is likely to be emitted from the transformer, is that the envelope of the current flowing through the primary winding of the transformer is shaped like a sine wave. Since these functions were enabled with the addition of very few parts, the economic effect was great.
【図１】本発明の実施例に係る省電力スイッチング電源
装置。FIG. 1 is a power-saving switching power supply according to an embodiment of the present invention.
【図２】図１のスイッチ素子１６の電流の波形を示す図
である。FIG. 2 is a diagram showing a waveform of a current of a switch element 16 in FIG.
【図３】従来の省電力スイッチング電源装置の一例を示
す図である。FIG. 3 is a diagram illustrating an example of a conventional power-saving switching power supply device.
１ フォトカプラの発光素子 ２ フォトカプラの受光素子 ３ 定電圧ダイオード ４ 第１のトランジスタ ５ 抵抗 ６ 第２のコンデンサ ７ 第２の抵抗 ８ スイッチ回路 ９ 第２のトランジスタ １０ 第３のコンデンサ １１ 第３の抵抗 １２ １次巻線 １３、１４ ２次側の巻線 １５ 正帰還巻線 １６ スイッチ素子 １７ 起動抵抗 １８ 第１のコンデンサ １９ 第１の抵抗 ２０ 発振制御回路 ２１、２２ ダイオード ２３、２４ コンデンサ ２５ リニアレギュレータ ２６ 主負荷回路 ２７ 待機回路 ２８、２９、３０、３１ 抵抗 ３２ 電圧検出ＩＣ ３３、３４、３５ トランジスタ ３６、３７ ダイオード ３８、３９ 抵抗 ４０ フォトカプラの発光素子 ４１ フォトカプラの受光素子 Reference Signs List 1 light emitting element of photocoupler 2 light receiving element of photocoupler 3 constant voltage diode 4 first transistor 5 resistor 6 second capacitor 7 second resistor 8 switch circuit 9 second transistor 10 third capacitor 11 third Resistor 12 Primary winding 13, 14 Secondary winding 15 Positive feedback winding 16 Switch element 17 Starting resistance 18 First capacitor 19 First resistor 20 Oscillation control circuit 21, 22 Diode 23, 24 Capacitor 25 Linear Regulator 26 Main load circuit 27 Standby circuit 28, 29, 30, 31 Resistance 32 Voltage detection IC 33, 34, 35 Transistor 36, 37 Diode 38, 39 Resistance 40 Photocoupler light emitting element 41 Photocoupler light receiving element
Claims (1)
上の巻線をもつトランスと、前記１次巻線に直列に接続
されたスイッチ素子と、前記スイッチ素子の制御電極と
前記正帰還巻線の正側の端子の間に接続された第１のコ
ンデンサと第１の抵抗とからなる直列回路と、前記２次
側の巻線に接続された整流平滑回路と、前記スイッチ素
子の発振を制御して前記整流平滑回路の出力電圧を一定
に保つ発振制御回路を備え、前記整流平滑回路の出力の
１つから待機回路に電力を供給しているリンギングチョ
ークコンバータにおいて、前記整流平滑回路の１組の出
力端子にフォトカプラの発光素子と定電圧ダイオードと
第１のトランジスタとからなる直列回路を接続し、前記
第１のトランジスタのベースに直流電流源を接続し、前
記第１のトランジスタのベースとエミッタの間に第２の
コンデンサと第２の抵抗とからなる並列回路を接続し、
更に前記第１のトランジスタのベースとエミッタの間に
待機時にオフになるスイッチ回路を接続し、前記スイッ
チ素子の制御電極に第２のトランジスタを接続し、前記
第２のトランジスタのベースとエミッタの間に第３のコ
ンデンサを接続し、前記第２のトランジスタのベースと
前記正帰還巻線の正側の端子の間に第３の抵抗を接続
し、前記フォトカプラの受光素子を前記スイッチ素子の
制御電極と前記第２のトランジスタのベースの間に接続
し、これによって待機時の消費電力を減ずることを特徴
とする待機時省電力スイッチング電源装置。1. A transformer having a primary winding, a positive feedback winding, and one or more windings on a secondary side, a switch element connected in series to the primary winding, and control of the switch element. A series circuit including a first capacitor and a first resistor connected between an electrode and a positive terminal of the positive feedback winding; a rectifying and smoothing circuit connected to the secondary winding; A ringing choke converter that includes an oscillation control circuit that controls the oscillation of the switch element to keep the output voltage of the rectifying / smoothing circuit constant, and supplies power to a standby circuit from one of the outputs of the rectifying / smoothing circuit; A series circuit including a light-emitting element of a photocoupler, a constant voltage diode, and a first transistor is connected to a set of output terminals of the rectifying and smoothing circuit; a DC current source is connected to a base of the first transistor; First Transis A parallel circuit consisting of a second capacitor and a second resistor is connected between the base and the emitter of the
Further, a switch circuit that is turned off during standby is connected between the base and the emitter of the first transistor, a second transistor is connected to a control electrode of the switch element, and a switch is connected between the base and the emitter of the second transistor. , A third resistor is connected between the base of the second transistor and the positive terminal of the positive feedback winding, and the light receiving element of the photocoupler is controlled by the switch element. A standby power-saving switching power supply device connected between an electrode and a base of the second transistor, thereby reducing power consumption during standby.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04418298A JP3665984B2 (en) | 1998-01-21 | 1998-01-21 | Standby power saving switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04418298A JP3665984B2 (en) | 1998-01-21 | 1998-01-21 | Standby power saving switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11215819A true JPH11215819A (en) | 1999-08-06 |
| JP3665984B2 JP3665984B2 (en) | 2005-06-29 |
Family
ID=12684442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04418298A Expired - Fee Related JP3665984B2 (en) | 1998-01-21 | 1998-01-21 | Standby power saving switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3665984B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6507504B2 (en) | 2000-12-11 | 2003-01-14 | Fuji Electric Co., Ltd. | Method of controlling DC/DC converter for reducing power consumption |
| KR20040008069A (en) * | 2002-07-15 | 2004-01-28 | 삼성전자주식회사 | Switching mode power supply for lowering stand-by power consumption |
| KR100476957B1 (en) * | 2002-07-23 | 2005-03-16 | 삼성전자주식회사 | Power supply controlling device of electronic equipment |
| US20110311260A1 (en) * | 2010-06-22 | 2011-12-22 | Canon Kabushiki Kaisha | Switching power source and image forming apparatus having the same |
| CN102299636A (en) * | 2010-06-22 | 2011-12-28 | 佳能株式会社 | Switching power source and image forming apparatus including the same |
| WO2014172723A1 (en) * | 2013-04-23 | 2014-10-30 | Tridonic Gmbh & Co Kg | Converter module for operating illuminants, having a galvanically isolated clocked converter |
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|---|---|---|---|---|
| JP5968152B2 (en) | 2011-09-07 | 2016-08-10 | キヤノン株式会社 | Switching power supply and image forming apparatus |
| JP6008521B2 (en) | 2012-03-09 | 2016-10-19 | キヤノン株式会社 | Power supply device and image forming apparatus |
| JP5950635B2 (en) | 2012-03-09 | 2016-07-13 | キヤノン株式会社 | Power supply device and image forming apparatus |
| JP6218446B2 (en) | 2013-06-14 | 2017-10-25 | キヤノン株式会社 | Power supply device and image forming apparatus |
-
1998
- 1998-01-21 JP JP04418298A patent/JP3665984B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6507504B2 (en) | 2000-12-11 | 2003-01-14 | Fuji Electric Co., Ltd. | Method of controlling DC/DC converter for reducing power consumption |
| KR20040008069A (en) * | 2002-07-15 | 2004-01-28 | 삼성전자주식회사 | Switching mode power supply for lowering stand-by power consumption |
| KR100476957B1 (en) * | 2002-07-23 | 2005-03-16 | 삼성전자주식회사 | Power supply controlling device of electronic equipment |
| US20110311260A1 (en) * | 2010-06-22 | 2011-12-22 | Canon Kabushiki Kaisha | Switching power source and image forming apparatus having the same |
| CN102299636A (en) * | 2010-06-22 | 2011-12-28 | 佳能株式会社 | Switching power source and image forming apparatus including the same |
| US8774669B2 (en) | 2010-06-22 | 2014-07-08 | Canon Kabushiki Kaisha | Switching power source and image forming apparatus including the same |
| US9025975B2 (en) * | 2010-06-22 | 2015-05-05 | Canon Kabushiki Kaisha | Switching power source and image forming apparatus having the same |
| WO2014172723A1 (en) * | 2013-04-23 | 2014-10-30 | Tridonic Gmbh & Co Kg | Converter module for operating illuminants, having a galvanically isolated clocked converter |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3665984B2 (en) | 2005-06-29 |
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