JPH0442771A - High efficiency type dc/dc converter - Google Patents
High efficiency type dc/dc converterInfo
- Publication number
- JPH0442771A JPH0442771A JP14608090A JP14608090A JPH0442771A JP H0442771 A JPH0442771 A JP H0442771A JP 14608090 A JP14608090 A JP 14608090A JP 14608090 A JP14608090 A JP 14608090A JP H0442771 A JPH0442771 A JP H0442771A
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- converter
- pwm
- power
- present
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- 238000006243 chemical reaction Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 14
- 239000003990 capacitor Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
［１要］
ＰＷＭスイッチングレギュレータ方式のＤＣ／ＤＣＣ／
式−タに関し、
従来のＤＣ／ＤＣＣ／式−タでは、負荷電力の大小に関
係なく、コンバータ中のＰＷＭ制御回路部（通常は集積
回路化され、ｒＰＷＭスイッチングレギュレータ・コン
トロールＩＣＪと称される）が常時作動しており、該Ｐ
ＷＭ制御回路部の消費電力により低出力電力時の交換効
率が低下していた問題の解決を目的とし、ＤＣ／ＤＣＣ
／式−タの出力電力が所定の値以上の場合には、上記Ｐ
ＷＭ制御回路部を常時作動させる第一の手段と、出力電
力が所定の値以下の場合には、上記ＰＷＭ制御回路部を
間欠動作させろ第二の手段を設けて構成する。[Detailed Description of the Invention] [1 Required] PWM switching regulator type DC/DCC/
Regarding the Equator, in conventional DC/DCC/Equator, the PWM control circuit section (usually integrated circuit, called rPWM switching regulator control ICJ) in the converter, regardless of the magnitude of load power, is in constant operation, and the P
With the aim of solving the problem of reduced exchange efficiency at low output power due to power consumption of the WM control circuit, DC/DCC
/Formula-If the output power of the
A first means for constantly operating the WM control circuit section and a second means for intermittently operating the PWM control circuit section when the output power is below a predetermined value are provided.
［産業上の利用分野］
本発明はＰＷＭ （Ｐｕｌｓｅ Ｗｉｄｔｈ Ｍｏｄｕ
ｌａｔｉｏｎ）スイッチングレギュレータ方式のＤＣ／
ＤＣＣ／式−タに関し、特に低出力電力時の交換効率を
大幅に改善したＤＣ／ＤＣＣ／式−タに関する。[Industrial Application Field] The present invention uses PWM (Pulse Width Modulus)
ration) Switching regulator type DC/
The present invention relates to a DCC/type controller, and particularly to a DC/DCC/type controller that has greatly improved exchange efficiency at low output power.
［従来の技術］
直流入力電圧を所定の直流出力電圧に変換するＤＣ／Ｄ
ＣＣ／式−タとして、スイッチングレギュレータ方式の
ものがあり、この回路構成例を第８図、第９図に示す。[Prior art] DC/D converts DC input voltage to predetermined DC output voltage
There is a switching regulator type CC/type controller, and examples of this circuit configuration are shown in FIGS. 8 and 9.
すなわち、第８図は入力電圧を昇圧して出力するステッ
プアップ型のＤＣ／ＤＣＣ／式−タを、第９図は入力電
圧を降圧して出力するステップダウン型のＤＣ／ＤＣＣ
／式−タを表わしている。これら従来例はよく知られた
ものであるが、以下これらの従来例について簡単に説明
を加えると、第８図のステップアップ型ＤＣ／ＤＣコン
バータでは、電池５１を直流入力電圧源として用い、Ｐ
ＷＭスイッチングレギュレータ・コントロールＩＣ５４
により、スイッチング用トランジスタ５３をオン／オフ
（ＯＮｌｏＦＦ）させ、チョーク５２に誘起された電流
により、ダイオード５５を介してコンデンサー５６を充
電し昇圧された直流出力電圧を得るものである。なお、
図中の抵抗器５７．５８は出力電圧の監視信号を生成す
るためのものであり、該信号によりコントロールＩＣ５
４からのＰＷＭパルスが制御され出力電圧を一定値に保
つ。That is, Fig. 8 shows a step-up type DC/DCC that boosts the input voltage and outputs it, and Fig. 9 shows a step-down type DC/DCC that steps down the input voltage and outputs it.
/ represents the expression - ta. These conventional examples are well known, but a brief explanation of these conventional examples will be given below.In the step-up DC/DC converter shown in FIG. 8, a battery 51 is used as a DC input voltage source, and P
WM switching regulator control IC54
As a result, the switching transistor 53 is turned on/off (ONloFF), and the current induced in the choke 52 charges the capacitor 56 via the diode 55 to obtain a boosted DC output voltage. In addition,
Resistors 57 and 58 in the figure are for generating an output voltage monitoring signal, and the control IC 5 is controlled by this signal.
The PWM pulse from 4 is controlled to keep the output voltage at a constant value.
また、同様に、第９図のステップダウン型のＤＣ／ＤＣ
Ｃ／式−タでは、電池６１を直流入力電圧源として用い
、ＰＷＭスイッチングレギュレータ・コントロールＩＣ
６４により、スイッチング用トランジスタ６３をオン／
オフ（ＯＮｌｏＦＦ）させ、チョーク６２およびコンデ
ンサ６６により平滑された直流出力電圧を得るものであ
る。Similarly, the step-down type DC/DC shown in FIG.
In the C/type-type controller, the battery 61 is used as a DC input voltage source, and the PWM switching regulator control IC
64 turns on/off the switching transistor 63.
It is turned off (ONloFF) to obtain a DC output voltage smoothed by the choke 62 and capacitor 66.
なおダイオード６５はフライホイールダイオードである
。Note that the diode 65 is a flywheel diode.
［発明が解決しようとする課題］
以上、従来技術の項で説明した、ＤＣ／ＤＣコンバータ
中のＰＷＭスイッチングレギュレータ・コントロールＩ
Ｃとしては、バイポーラ（Ｂｉｐｏｌａｒ）型の物が良
く使用され、このバイポラ型の物はＣＭＯ３型の物と比
較して、動作発振周波数範囲が広く、高周波発振が可能
（〜５００ｋＨｚ）であり、これにより主回路のチョク
やコンデンサを小さくすることができ、ＰＷＭスイッチ
ングレギュレータ・コントロールＩＣへの供給電力が無
視できるような中、高出力電力時での変換効率が向上す
る。[Problem to be solved by the invention] As explained above in the section of the prior art, the PWM switching regulator control I in the DC/DC converter
Bipolar type C is often used, and this bipolar type has a wider operating oscillation frequency range and is capable of high frequency oscillation (~500kHz) compared to CMO3 type. This makes it possible to reduce the size of the choke and capacitor in the main circuit, improving conversion efficiency at high output power while the power supplied to the PWM switching regulator/control IC can be ignored.
しかしながら、スイッチングレギュレータ・コントロー
ルＩＣへの供給電力が無視できないような低出力電力時
での変換効率は大幅に悪くなり、電池から電力を供給す
る装置において、数ｍＷ〜数千ｍＷ程度の負荷に電力を
供給し、かつ、数ｍＷの負荷への電力供給が長時間必要
な場合には、コントロールＩＣ自身の電力消費により電
池が消耗してしまい、実用的とは言えなかった。However, the conversion efficiency deteriorates significantly at low output power when the power supplied to the switching regulator/control IC cannot be ignored. When it is necessary to supply several milliwatts of power to a load for a long time, the control IC itself consumes power and the battery is exhausted, making it impractical.
本発明は上記問題点に鑑みなされたものであり、低出力
電力時の変換効率を大幅に改善した高効率型ＤＣ／ＤＣ
コンバータを提供）−ることを目的とする。The present invention was made in view of the above problems, and provides a high-efficiency DC/DC that significantly improves conversion efficiency at low output power.
converter).
［課題を解決するための手段］
本発明によれば、上述の目的は前記特許請求の範囲に記
載した手段により達成される。[Means for Solving the Problems] According to the present invention, the above objects are achieved by the means described in the claims.
すなわち、本発明は、直流電圧源を入力電源とし、該入
力電源と接続されたスイッチング用トランジスタのオン
／オフ制御により所定の直流出力電圧を得るＰＷＭスイ
ッチングレギュレータ方式のＤＣ／ＤＣＣ／式−タにお
いて、上記ＤＣ／ＤＣＣ／式−タの出力電力が所定の値
以上の場合には、上記スイッチング用トランジスタをオ
ン／オフ制御するためのＰＷＭ制御回路部を常時作動さ
せる第一の手段と、ＤＣ／ＤＣＣ／式−タの出力電力が
所定の値以下の場合には、上記ＰＷＭ制御回路部を間欠
動作させ、出力電圧が所定の範囲内に入るよう制御する
第二の手段とを設けた高効率型ＤＣ／ＤＣＣ／式−タで
ある。That is, the present invention provides a PWM switching regulator type DC/DCC/type controller which uses a DC voltage source as an input power source and obtains a predetermined DC output voltage by on/off control of a switching transistor connected to the input power source. , a first means for constantly operating a PWM control circuit section for controlling on/off of the switching transistor when the output power of the DC/DCC/equation controller is equal to or higher than a predetermined value; When the output power of the DCC/type controller is below a predetermined value, the PWM control circuit section is operated intermittently to control the output voltage to fall within a predetermined range. Type DC/DCC/formula-ta.
［作 用］
本発明の高効率型ＤＣ／ＤＣＣ／式−タにおいては、負
荷に供給する電力が少なくて良い場合には、スイッチン
グトランジスタをオン／オフ駆動するＰＷＭ制御回路部
（通常はＩＣ化され、ｒＰＷＭスイッチングレギュレー
タ・コントロールＩＣＪと称される）での消費電力の割
合いが大きくなり、電力変換効率を悪化させていた問題
を解決するために、上記コントロールＩＣを中、高電力
時の変換効率のよい時は本来のＰＷＭコントロールをさ
せ、低出力電力時はコントロールＩＣを間欠動作させ変
換効率の改善を図る。[Function] In the high-efficiency DC/DCC/type controller of the present invention, when the power to be supplied to the load is small, the PWM control circuit section (usually IC-based) that turns on/off the switching transistor is used. In order to solve the problem that the ratio of power consumption in the rPWM switching regulator control ICJ (rPWM switching regulator control ICJ) was increasing and the power conversion efficiency was worsening, the above control IC was changed to a converter for medium and high power. When the efficiency is high, the original PWM control is performed, and when the output power is low, the control IC is operated intermittently to improve the conversion efficiency.
［実施例コ
実施例その１
第１図は本発明の第一の実施例を示しており、ステップ
アップ型ＤＣ／ＤＣコンバータに本発明を応用した例で
あり、かつ、スイッチングレギュレータ・コントロール
ＩＣにその動作の禁止／許可を指示するコントロール端
子（ＣＴＬ）を有する場合の例である。[Embodiment 1] Figure 1 shows a first embodiment of the present invention, which is an example in which the present invention is applied to a step-up DC/DC converter, and is applied to a switching regulator control IC. This is an example of a case where a control terminal (CTL) is provided to instruct prohibition/permission of the operation.
第１図において、１は電池、２はチョーク、３はスイッ
チング用トランジスタ（Ｔｒｉ） 、４ハスイツチング
レギユレータ・コントロールＩＣ，５は整流用ダイオー
ド、６はコンパレータ、７はコンデンサ、８〜１４は抵
抗器、１５〜１７はダイオード、１８はツェナーダイオ
ードを表わしており、第８図の従来のステップアップ型
のＤＣ／ＤＣコンバータと比較して新たに破線で囲まれ
る部分が追加回路部として付加されたものである。In Figure 1, 1 is a battery, 2 is a choke, 3 is a switching transistor (Tri), 4 is a switching regulator control IC, 5 is a rectifier diode, 6 is a comparator, 7 is a capacitor, 8 to 14 15 to 17 are resistors, 15 to 17 are diodes, and 18 is a Zener diode. Compared to the conventional step-up DC/DC converter shown in Fig. 8, the part surrounded by the broken line is newly added as an additional circuit part. It is what was done.
以下、本実施例の動作について説明する。The operation of this embodiment will be explained below.
ｒン）ｏ−ルＴＣ４はそのコントロール端子（ＣＴＬ）
を低レベル（Ｌｏｗ ）にすることにより動作を開始す
る。そこで中、高電力出力時には、例えば負荷電流を検
出するか、スイッチ切り換えなどして、負荷側からの信
号◎を低レベル（Ｌｏｗ ）にしておき、コントロール
ＩＣ４に通常のＰＷＭ制御動作を実行させる。TC4 is its control terminal (CTL)
The operation is started by setting the signal to a low level (Low). Therefore, when outputting medium or high power, the signal ◎ from the load side is kept at a low level (Low) by, for example, detecting the load current or switching a switch, and the control IC 4 is caused to perform a normal PWM control operation.
また、低出力電力時には信号■を高レベル（Ｈｉｇｈ）
とし、追加回路部によりコントロールＩＣ４を間欠動作
させる。Also, when the output power is low, the signal ■ is set to high level (High).
Then, the control IC 4 is operated intermittently by the additional circuit section.
すなわち、出力電圧（Ｖｏｕｔ）はコンパレータ６によ
りツェナーダイオード１８のツェナー電圧を基準とし監
視されており、第２図の本発明の第一の実施例の動作波
形を示す図に示されるごとく、出力電圧が低下しＶｌ
に到達すると、コンパレータ６の出力電圧（第１図中
の０点）は低レベル（ＬＯＷ）トナリ、コントロールＩ
Ｃ４ＩｔＰＷＭ動作（数１００七のＰＷＭパルス発生
）を開始し、出力電圧は上昇し始める。そして、出力電
圧がｖ２に到達するとコンパレータ６の出力％Ｅ 圧ハ
高レベル（Ｈ＋ｇｈ）となり、コントロールＩＣ４の動
作が停止する。That is, the output voltage (Vout) is monitored by the comparator 6 with reference to the Zener voltage of the Zener diode 18, and as shown in the diagram showing the operating waveforms of the first embodiment of the present invention in FIG. decreases and Vl
When the output voltage of the comparator 6 (0 point in Figure 1) reaches the low level (LOW), the control I
C4It PWM operation (generation of several hundred seven PWM pulses) is started, and the output voltage begins to rise. Then, when the output voltage reaches v2, the output %E voltage of the comparator 6 becomes a high level (H+gh), and the operation of the control IC 4 is stopped.
このように、コントロールＩＣ４を間欠動作（数１００
＆周期）させることにより、出力１圧（Ｖｏｕｔ）の変
動を所定の範囲内（△Ｖｏｕｔ）に収めることができる
。In this way, the control IC 4 is operated intermittently (several 100
& period), it is possible to keep fluctuations in the output 1 pressure (Vout) within a predetermined range (ΔVout).
ナオ、電圧値Ｖ１．Ｖ２ はコンパレータ６にヒステリ
ンス特性をもたせて決定する。Nao, voltage value V1. V2 is determined by giving the comparator 6 a hysteresis characteristic.
また、第３図は本発明の第一の実施例の変形例を示す図
であり、ＰＷＭスイッチングレギュレータ・コントロー
ルＩＣにその動作の禁止／許可を指示するコントロール
端子（ＣＴＬ）がなし）場合の例であり、２０はコント
ロールＩＣ４への供給電源をオン／オフ（○Ｎ１０ＦＦ
）するトランジスタ（丁ｒ ２ ） 、２１．２２は抵
抗器を表わしており、他の符号は第１図の場合と同様で
ある。Further, FIG. 3 is a diagram showing a modification of the first embodiment of the present invention, in which the PWM switching regulator control IC does not have a control terminal (CTL) for instructing prohibition/permission of its operation. 20 turns on/off the power supply to the control IC4 (○N10FF
), 21.22 represents a resistor, and the other symbols are the same as in FIG.
この実施例では、コントロールＩＣ４へノ供給電源をオ
ン／オフし、該コントロールＩＣ４の間欠動作を行なわ
せるものである。In this embodiment, the power supply to the control IC 4 is turned on/off to cause the control IC 4 to perform intermittent operation.
また、第４図は本発明の効果について説明する図を示し
ており、第４図（ａ）は従来例の場合（通常使用時）、
第４図（ｂ）、第４図（ｃ）は本発明の場合（ＣＴＬ制
御）で、それぞれ、入力電圧・電流に対する出力電圧・
電流と変換効率とを示したものである。Moreover, FIG. 4 shows a diagram explaining the effects of the present invention, and FIG. 4(a) shows the conventional example (during normal use);
Figures 4(b) and 4(c) show the case of the present invention (CTL control), and the output voltage and the input voltage and current are respectively
It shows current and conversion efficiency.
すなわち、本発明によれば、低出力電力時の変換効率を
従来例の２０〜３０％から６０〜７０％に改善すること
ができる。That is, according to the present invention, the conversion efficiency at low output power can be improved from 20 to 30% in the conventional example to 60 to 70%.
実施例その２゜
第４図は本発明の第二の実施例を示す図であり、ステッ
プダウン型ＤＣ／ＤＣコンバータに本発明を応用した例
である。本例は、第９図に示した従来の回路構成と比較
して、新たに破線で囲まれた部分が追加回路部として付
加されており、図中の各記号は第１図の場合と同様であ
る。Embodiment 2 FIG. 4 is a diagram showing a second embodiment of the present invention, which is an example in which the present invention is applied to a step-down type DC/DC converter. In this example, compared to the conventional circuit configuration shown in Fig. 9, a part surrounded by a broken line has been newly added as an additional circuit section, and each symbol in the figure is the same as in Fig. 1. It is.
さらに、破線内の追加回路部中の動作も、第１図の場合
と同様であり、第５図の本発明の第二の実施例の動作波
形を示す図のごとく、出力電圧（Ｖｏυｔ）は電圧値Ｖ
、から■４まで、コントロールＩＣ４を間欠動作させて
制御される。Furthermore, the operation in the additional circuit section within the broken line is also the same as in the case of FIG. 1, and as shown in FIG. Voltage value V
, to (4) are controlled by intermittently operating the control IC 4.
さらに、第７図は本発明の第二の実施例の変形例を示す
図であり、コントロールＩＣ４にその動作の禁止／許可
を制御するためのコントロール端子（ＣＴＬ）を有しな
い場合の例であり、トランジス９ （Ｔｒ２） ２０に
よりコントロールＩＣ４への供給電源をオン／オフして
間欠動作を行なわせる。Furthermore, FIG. 7 is a diagram showing a modification of the second embodiment of the present invention, and is an example in which the control IC 4 does not have a control terminal (CTL) for controlling prohibition/permission of its operation. , transistors 9 (Tr2) 20 turn on/off the power supply to the control IC 4 to perform intermittent operation.
［発明の効果］
以上説明したごとく、本発明のＤＣ／ＤＣコンバータに
よれば、中、高出力電力時の変換効率のよい時は本来の
ＰＷＭコントロールをさせ、低出力電力時は外部からコ
ントロールＩＣを間欠動作させ、コントロールＩＣへの
平均供給電力を１７２〜１１５に低減することにより、
変換効率を２０〜３０％から６０〜７０％に改善するこ
とができる。[Effects of the Invention] As explained above, according to the DC/DC converter of the present invention, the original PWM control is performed when the conversion efficiency is good during medium and high output power, and the control IC is controlled from the outside when the output power is low. By operating intermittently and reducing the average power supplied to the control IC to 172 to 115,
Conversion efficiency can be improved from 20-30% to 60-70%.
第１図は本発明の第一の実施例を示す図、第２図は本発
明の第一の実施例の動作波形を示す図、第３図は本発明
の第一の実施例の変形例を示す図、第４図は本発明の効
果について説明する図、第５図は本発明の第二の実施例
を示す図、第６図は本発明の第二の実施例の動作波形を
示す図、第７図は本発明の第二の実施例の変形例を示す
図、第８図は従来のステップアップ型ＤＣ／ＤＣコンバ
ータの回路構成例を示す図、第９図は従来のステップダ
ウン型ＤＣ／ＤＣフンバータの回路構成例を示す図であ
る。
１・・・・・電池、２・・・−・・チョーク、３・・・
・・・スイッチング用トランジスタ （Ｔｒｉ）、４・
・・−・・ＰＷＭスイッチングレギュレータ・コントロ
ールＩＣ。FIG. 1 is a diagram showing a first embodiment of the present invention, FIG. 2 is a diagram showing operating waveforms of the first embodiment of the present invention, and FIG. 3 is a modification of the first embodiment of the present invention. FIG. 4 is a diagram explaining the effects of the present invention, FIG. 5 is a diagram showing a second embodiment of the present invention, and FIG. 6 is a diagram showing operating waveforms of the second embodiment of the present invention. 7 is a diagram showing a modification of the second embodiment of the present invention, FIG. 8 is a diagram showing an example of the circuit configuration of a conventional step-up type DC/DC converter, and FIG. 9 is a diagram showing a conventional step-down type DC/DC converter. FIG. 3 is a diagram illustrating an example of a circuit configuration of a type DC/DC humbatterer. 1...Battery, 2...-Choke, 3...
...Switching transistor (Tri), 4.
...PWM switching regulator control IC.
Claims (1)
イッチング用トランジスタのオン／オフ制御により所定
の直流出力電圧を得るＰＷＭスイッチングレギュレータ
方式のＤＣ／ＤＣコンバータにおいて、 上記ＤＣ／ＤＣコンバータの出力電力が所定の値以上の
場合には、上記スイッチング用トランジスタをオン／オ
フ制御するためのＰＷＭ制御回路部を常時作動させる第
一の手段と、 ＤＣ／ＤＣコンバータの出力電力が所定の値以下の場合
には、上記ＰＷＭ制御回路部を間欠動作させ、出力電圧
が所定の範囲内に入るよう制御する第二の手段とを、 設けたことを特徴とする高効率型ＤＣ／ＤＣコンバータ
。[Scope of Claims] A PWM switching regulator type DC/DC converter that uses a DC voltage source as an input power source and obtains a predetermined DC output voltage by on/off control of a switching transistor connected to the input power source, comprising: a first means for constantly operating a PWM control circuit section for controlling on/off of the switching transistor when the output power of the DC/DC converter is equal to or higher than a predetermined value; and second means for controlling the output voltage to fall within a predetermined range by intermittently operating the PWM control circuit when the voltage is below a predetermined value. DC converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14608090A JPH0442771A (en) | 1990-06-06 | 1990-06-06 | High efficiency type dc/dc converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14608090A JPH0442771A (en) | 1990-06-06 | 1990-06-06 | High efficiency type dc/dc converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0442771A true JPH0442771A (en) | 1992-02-13 |
Family
ID=15399664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14608090A Pending JPH0442771A (en) | 1990-06-06 | 1990-06-06 | High efficiency type dc/dc converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0442771A (en) |
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5949226A (en) * | 1995-04-10 | 1999-09-07 | Kabushiki Kaisha Toyoda Jidoshokki Seisakush | DC/DC converter with reduced power consumpton and improved efficiency |
| US5994885A (en) * | 1993-03-23 | 1999-11-30 | Linear Technology Corporation | Control circuit and method for maintaining high efficiency over broad current ranges in a switching regulator circuit |
| US6127815A (en) * | 1999-03-01 | 2000-10-03 | Linear Technology Corp. | Circuit and method for reducing quiescent current in a switching regulator |
| US6294903B1 (en) | 1999-04-15 | 2001-09-25 | Matsushita Electric Industrial Co., Ltd. | Switching power supply |
| US6307356B1 (en) | 1998-06-18 | 2001-10-23 | Linear Technology Corporation | Voltage mode feedback burst mode circuit |
| US6476589B2 (en) | 2001-04-06 | 2002-11-05 | Linear Technology Corporation | Circuits and methods for synchronizing non-constant frequency switching regulators with a phase locked loop |
| US7019507B1 (en) | 2003-11-26 | 2006-03-28 | Linear Technology Corporation | Methods and circuits for programmable current limit protection |
| US7030596B1 (en) | 2003-12-03 | 2006-04-18 | Linear Technology Corporation | Methods and circuits for programmable automatic burst mode control using average output current |
| JP2008182891A (en) * | 2002-07-10 | 2008-08-07 | Marvell World Trade Ltd | Output regulator |
| JP2009189108A (en) * | 2008-02-05 | 2009-08-20 | Shindengen Electric Mfg Co Ltd | Switching power supply |
| USRE41037E1 (en) | 2002-09-12 | 2009-12-15 | Linear Technology Corp. | Adjustable minimum peak inductor current level for burst mode in current-mode DC-DC regulators |
| JP2009303303A (en) * | 2008-06-10 | 2009-12-24 | Ricoh Co Ltd | Switching regulator |
| JP2010206949A (en) * | 2009-03-04 | 2010-09-16 | Shindengen Electric Mfg Co Ltd | Switching power supply |
| US7876076B2 (en) | 2006-05-11 | 2011-01-25 | Fujitsu Semiconductor Limited | Circuit for preventing through current in DC-DC converter |
| US7990120B2 (en) | 2006-08-04 | 2011-08-02 | Linear Technology Corporation | Circuits and methods for adjustable peak inductor current and hysteresis for burst mode in switching regulators |
| TWI408881B (en) * | 2011-04-18 | 2013-09-11 | Richtek Technology Corp | Enhanced phase control circuit and method for a multiphase power converter |
| JP2014508505A (en) * | 2011-07-14 | 2014-04-03 | ソフトキネティック センサーズ エヌヴィー | LED driver circuit for time-of-flight calculation |
| US10103632B2 (en) | 2011-04-18 | 2018-10-16 | Richtek Technology Corp. | Enhanced phase control circuit and method for a multiphase power converter |
| KR102250427B1 (en) | 2020-10-15 | 2021-05-12 | 주식회사 파워엘에스아이 | Low power control device using sleep timer |
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|---|---|---|---|---|
| JPS62501381A (en) * | 1985-01-10 | 1987-06-04 | モトロ−ラ・インコ−ポレ−テッド | DC-DC converter |
| JPS6439265A (en) * | 1987-07-31 | 1989-02-09 | Toshiba Corp | Dc-dc converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62501381A (en) * | 1985-01-10 | 1987-06-04 | モトロ−ラ・インコ−ポレ−テッド | DC-DC converter |
| JPS6439265A (en) * | 1987-07-31 | 1989-02-09 | Toshiba Corp | Dc-dc converter |
Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5994885A (en) * | 1993-03-23 | 1999-11-30 | Linear Technology Corporation | Control circuit and method for maintaining high efficiency over broad current ranges in a switching regulator circuit |
| US6304066B1 (en) | 1993-03-23 | 2001-10-16 | Linear Technology Corporation | Control circuit and method for maintaining high efficiency over broad current ranges in a switching regular circuit |
| US6580258B2 (en) | 1993-03-23 | 2003-06-17 | Linear Technology Corporation | Control circuit and method for maintaining high efficiency over broad current ranges in a switching regulator circuit |
| US6157182A (en) * | 1995-04-10 | 2000-12-05 | Kabushiki Kaisha Toyoda | DC/DC converter with multiple operating modes |
| US5949226A (en) * | 1995-04-10 | 1999-09-07 | Kabushiki Kaisha Toyoda Jidoshokki Seisakush | DC/DC converter with reduced power consumpton and improved efficiency |
| US6307356B1 (en) | 1998-06-18 | 2001-10-23 | Linear Technology Corporation | Voltage mode feedback burst mode circuit |
| US6127815A (en) * | 1999-03-01 | 2000-10-03 | Linear Technology Corp. | Circuit and method for reducing quiescent current in a switching regulator |
| US6366066B1 (en) | 1999-03-01 | 2002-04-02 | Milton E. Wilcox | Circuit and method for reducing quiescent current in a switching regulator |
| US6294903B1 (en) | 1999-04-15 | 2001-09-25 | Matsushita Electric Industrial Co., Ltd. | Switching power supply |
| US7019497B2 (en) | 2001-04-06 | 2006-03-28 | Linear Technology Corporation | Circuits and methods for synchronizing non-constant frequency switching regulators with a phase locked loop |
| US6476589B2 (en) | 2001-04-06 | 2002-11-05 | Linear Technology Corporation | Circuits and methods for synchronizing non-constant frequency switching regulators with a phase locked loop |
| US6774611B2 (en) | 2001-04-06 | 2004-08-10 | Linear Technology Corporation | Circuits and methods for synchronizing non-constant frequency switching regulators with a phase locked loop |
| JP2008182891A (en) * | 2002-07-10 | 2008-08-07 | Marvell World Trade Ltd | Output regulator |
| USRE41037E1 (en) | 2002-09-12 | 2009-12-15 | Linear Technology Corp. | Adjustable minimum peak inductor current level for burst mode in current-mode DC-DC regulators |
| US7019507B1 (en) | 2003-11-26 | 2006-03-28 | Linear Technology Corporation | Methods and circuits for programmable current limit protection |
| US7030596B1 (en) | 2003-12-03 | 2006-04-18 | Linear Technology Corporation | Methods and circuits for programmable automatic burst mode control using average output current |
| US7876076B2 (en) | 2006-05-11 | 2011-01-25 | Fujitsu Semiconductor Limited | Circuit for preventing through current in DC-DC converter |
| US7990120B2 (en) | 2006-08-04 | 2011-08-02 | Linear Technology Corporation | Circuits and methods for adjustable peak inductor current and hysteresis for burst mode in switching regulators |
| JP2009189108A (en) * | 2008-02-05 | 2009-08-20 | Shindengen Electric Mfg Co Ltd | Switching power supply |
| JP2009303303A (en) * | 2008-06-10 | 2009-12-24 | Ricoh Co Ltd | Switching regulator |
| US8581567B2 (en) | 2008-06-10 | 2013-11-12 | Ricoh Company, Ltd. | Controlling switching regulator under light load conditions |
| JP2010206949A (en) * | 2009-03-04 | 2010-09-16 | Shindengen Electric Mfg Co Ltd | Switching power supply |
| TWI408881B (en) * | 2011-04-18 | 2013-09-11 | Richtek Technology Corp | Enhanced phase control circuit and method for a multiphase power converter |
| US9461544B2 (en) | 2011-04-18 | 2016-10-04 | Richtek Technology Corporation | Enhanced phase control circuit and method for a multiphase power converter |
| US10103632B2 (en) | 2011-04-18 | 2018-10-16 | Richtek Technology Corp. | Enhanced phase control circuit and method for a multiphase power converter |
| JP2014508505A (en) * | 2011-07-14 | 2014-04-03 | ソフトキネティック センサーズ エヌヴィー | LED driver circuit for time-of-flight calculation |
| KR102250427B1 (en) | 2020-10-15 | 2021-05-12 | 주식회사 파워엘에스아이 | Low power control device using sleep timer |
| US11791706B2 (en) | 2020-10-15 | 2023-10-17 | Power LSI Co.ltd | Low power control device using sleep timer |
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