JP2006228076A - Voltage regulator - Google Patents

Voltage regulator Download PDF

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JP2006228076A
JP2006228076A JP2005043335A JP2005043335A JP2006228076A JP 2006228076 A JP2006228076 A JP 2006228076A JP 2005043335 A JP2005043335 A JP 2005043335A JP 2005043335 A JP2005043335 A JP 2005043335A JP 2006228076 A JP2006228076 A JP 2006228076A
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voltage
intermittent operation
voltage regulator
circuit
output
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Atsuko Matsumura
敦子 松村
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Seiko Instruments Inc
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Seiko Instruments Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a voltage regulator for outputting a stable voltage, even in sharp fluctuations in supply voltage, in a voltage regulator with intermittent operation functions. <P>SOLUTION: The voltage regulator is provided with a control means for an intermittent operation function, having a circuit configuration for stopping the intermittent operation function for continuous operation by detecting lowering of the supply voltage, when the voltage regulator is operated intermittently, thereby obtaining a stable output voltage. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、間欠動作機能を具備するボルテージ・レギュレータにおいて、その間欠動作機能の制御が可能なボルテージ・レギュレータに関する。   The present invention relates to a voltage regulator having an intermittent operation function and a voltage regulator capable of controlling the intermittent operation function.

従来のボルテージ・レギュレータとしては、図４の回路図に示すような回路が知られていた。即ち、抵抗１１と抵抗１２からなる電圧分圧回路１と、基準電圧回路２と、コンパレータ３と、Ｐチャネル型ＭＯＳトランジスタ４で構成されている（例えば、特許文献１）。 As a conventional voltage regulator, a circuit as shown in the circuit diagram of FIG. 4 has been known. In other words, the voltage dividing circuit 1 is composed of a resistor 11 and a resistor 12, a reference voltage circuit 2, a comparator 3, and a P-channel MOS transistor 4 (for example, Patent Document 1).

エラーアンプ３は、基準電圧回路２の基準電圧と電圧分圧回路１の出力電圧を比較し、出力電圧Ｖｏｕｔが基準電圧と同じ電圧に保つようにＰチャネル型ＭＯＳトランジスタ４のゲート電圧を制御する。   The error amplifier 3 compares the reference voltage of the reference voltage circuit 2 with the output voltage of the voltage divider circuit 1 and controls the gate voltage of the P-channel MOS transistor 4 so that the output voltage Vout is kept at the same voltage as the reference voltage. .

また、このボルテージ・レギュレータを間欠動作させ、消費電流を削減するという使い方がされていた。
特開２００１−２８２３７１ In addition, the voltage regulator is operated intermittently to reduce current consumption.
JP 2001-282371 A

しかしながら従来のボルテージ・レギュレータにおいては、間欠動作状態で電源電圧が急激に下がると過度の出力電圧降下を引き起こし、ボルテージ・レギュレータの出力電圧を一定値に保つ事が不可能になり、ボルテージ・レギュレータの出力電圧を電源電圧として動作している他の回路を誤動作させるという問題点があった。
そこで本発明の目的は、従来のこのような課題を解決するため、間欠動作機能付きボルテージ・レギュレータの安定動作を可能にすることである。 However, in the conventional voltage regulator, if the power supply voltage drops rapidly in the intermittent operation state, an excessive output voltage drop occurs, making it impossible to keep the output voltage of the voltage regulator at a constant value. There has been a problem in that other circuits operating with the output voltage as a power supply voltage malfunction.
Accordingly, an object of the present invention is to enable a stable operation of a voltage regulator with an intermittent operation function in order to solve such a conventional problem.

上記問題点を解決するために、本発明のボルテージ・レギュレータは、間欠動作機能の制御手段を具備し、電源電圧が低下した際に間欠動作機能を停止して常時動作する回路構成とした。 In order to solve the above problems, the voltage regulator of the present invention has a control means for intermittent operation function, and has a circuit configuration in which the intermittent operation function is stopped and always operated when the power supply voltage decreases.

本発明の間欠動作機能付きボルテージ・レギュレータは、電源電圧が低下した時にその間欠動作機能を停止する制御手段を具備することにより、電源電圧が極度に低下した際に間欠動作機能を止めて常時動作することで、安定動作ができるという効果がある。 The voltage regulator with an intermittent operation function according to the present invention includes a control means for stopping the intermittent operation function when the power supply voltage drops, so that the intermittent operation function is stopped when the power supply voltage is extremely reduced to always operate. By doing so, there is an effect that stable operation can be performed.

本発明のボルテージ・レギュレータは、間欠動作機能の制御手段を具備し、ボルテージ・レギュレータが間欠動作状態にあるときに電源電圧が低下したことを検出して、間欠動作機能を停止し常時動作することにより、安定した出力電圧が得られる回路構成としたものである。   The voltage regulator of the present invention has a control means for the intermittent operation function, detects that the power supply voltage has dropped when the voltage regulator is in the intermittent operation state, stops the intermittent operation function, and operates constantly. Thus, a circuit configuration in which a stable output voltage can be obtained is obtained.

図１は、第１の実施例の間欠動作機能付きボルテージ・レギュレータのブロック図である。   FIG. 1 is a block diagram of a voltage regulator with an intermittent operation function according to the first embodiment.

ボルテージ・レギュレータ７は間欠動作を制御する制御信号を入力するＣＥ端子を具備しており、ＣＥ端子に入力される制御信号であるＣＬＫ信号に基づいて間欠動作する。ＣＬＫ信号はＮＡＮＤ回路６を介してＣＥ端子に入力される。ＮＡＮＤ回路６のもう一方の入力端子には、間欠動作を制限する信号であるコンパレータ５の出力を入力する。コンパレータ５は、抵抗２１と抵抗２２からなる抵抗分圧回路２３の出力と、基準電圧回路２０の出力を比較して、抵抗分圧回路２３の出力に応じてボルテージ・レギュレータの間欠動作を制御する。   The voltage regulator 7 has a CE terminal for inputting a control signal for controlling the intermittent operation, and operates intermittently based on a CLK signal that is a control signal input to the CE terminal. The CLK signal is input to the CE terminal via the NAND circuit 6. The other input terminal of the NAND circuit 6 receives the output of the comparator 5 that is a signal for limiting the intermittent operation. The comparator 5 compares the output of the resistance voltage dividing circuit 23 composed of the resistors 21 and 22 with the output of the reference voltage circuit 20, and controls the intermittent operation of the voltage regulator according to the output of the resistance voltage dividing circuit 23. .

抵抗分圧回路２３の出力が基準電圧回路２０の出力よりも高い場合は、コンパレータ５の出力からＨレベル信号が出力される。従って、ＮＡＮＤ回路６はＣＬＫの反転信号をボルテージ・レギュレータ７のＣＥ端子に出力し、ボルテージ・レギュレータはＣＬＫ信号の周波数で間欠動作を行う。   When the output of the resistance voltage dividing circuit 23 is higher than the output of the reference voltage circuit 20, an H level signal is output from the output of the comparator 5. Therefore, the NAND circuit 6 outputs an inverted signal of CLK to the CE terminal of the voltage regulator 7, and the voltage regulator performs an intermittent operation at the frequency of the CLK signal.

一方、抵抗分圧回路２３の出力が基準電圧回路２０の出力よりも低い場合は、コンパレータ５の出力からＬレベル信号が出力される。従って、ＮＡＮＤ回路６はＣＬＫ信号によらずＨレベル信号をボルテージ・レギュレータ７のＣＥ端子に出力し、ボルテージ・レギュレータ７は常に動作することになる。   On the other hand, when the output of the resistance voltage dividing circuit 23 is lower than the output of the reference voltage circuit 20, an L level signal is output from the output of the comparator 5. Therefore, the NAND circuit 6 outputs an H level signal to the CE terminal of the voltage regulator 7 regardless of the CLK signal, and the voltage regulator 7 always operates.

以上のように電源電圧が任意の基準電圧より低い時に、間欠動作を停止して常時動作とすることにより、間欠動作機能付きボルテージ・レギュレータの安定動作を実現できる。   As described above, when the power supply voltage is lower than an arbitrary reference voltage, the stable operation of the voltage regulator with the intermittent operation function can be realized by stopping the intermittent operation and always operating.

図２は、第２の実施例の間欠動作機能付きボルテージ・レギュレータのブロック図である。   FIG. 2 is a block diagram of a voltage regulator with an intermittent operation function according to the second embodiment.

実施例１と同様に、ボルテージ・レギュレータ７は間欠動作を制御する制御信号を入力するＣＥ端子を具備しており、ＣＥ端子に入力される制御信号であるＣＬＫ信号に基づいて間欠動作する。ＣＬＫ信号はＮＡＮＤ回路６を介してＣＥ端子に入力される。ＮＡＮＤ回路６のもう一方の入力端子には、間欠動作を制限する信号を入力する。   Similar to the first embodiment, the voltage regulator 7 includes a CE terminal that inputs a control signal for controlling intermittent operation, and operates intermittently based on a CLK signal that is a control signal input to the CE terminal. The CLK signal is input to the CE terminal via the NAND circuit 6. A signal for limiting the intermittent operation is input to the other input terminal of the NAND circuit 6.

間欠動作を制限する信号は、ＸＮＯＲ回路８の出力信号としている。ＸＮＯＲ回路８は、実施例１と同様のコンパレータ５の出力と、コンパレータ５の出力を遅延回路９によって遅延した信号とを入力としている。   A signal for limiting the intermittent operation is an output signal of the XNOR circuit 8. The XNOR circuit 8 receives as inputs the output of the comparator 5 similar to that of the first embodiment and a signal obtained by delaying the output of the comparator 5 by the delay circuit 9.

図３に、本発明の第２の実施例の間欠動作機能付きボルテージ・レギュレータのタイミングチャート示す。抵抗分圧回路２３の出力が基準電圧回路２０の出力よりも高い場合は、コンパレータ５の出力からＨレベル信号が出力される。遅延回路９の信号もＨレベル信号が出力される。従って、ＸＮＯＲ回路８の出力信号はＨレベルとなり、ボルテージ・レギュレータはＣＬＫ信号の周波数で間欠動作を行う。   FIG. 3 shows a timing chart of a voltage regulator with an intermittent operation function according to the second embodiment of the present invention. When the output of the resistance voltage dividing circuit 23 is higher than the output of the reference voltage circuit 20, an H level signal is output from the output of the comparator 5. An H level signal is also output from the delay circuit 9. Therefore, the output signal of the XNOR circuit 8 becomes H level, and the voltage regulator performs an intermittent operation at the frequency of the CLK signal.

抵抗分圧回路２３の出力が徐々に下がってきて、基準電圧回路２０の出力よりも低くなった時に、コンパレータ５の出力からＨレベル信号からＬレベル信号に変わる。遅延回路９の信号は遅延時間分だけ遅れてＬレベル信号が出力される。従って、ＸＮＯＲ回路８の出力信号は遅延時間分だけＬレベルとなり、ボルテージ・レギュレータは遅延時間分だけ間欠動作を停止する。   When the output of the resistance voltage dividing circuit 23 gradually decreases and becomes lower than the output of the reference voltage circuit 20, the output of the comparator 5 changes from an H level signal to an L level signal. The signal of the delay circuit 9 is delayed by the delay time and an L level signal is output. Therefore, the output signal of the XNOR circuit 8 becomes L level for the delay time, and the voltage regulator stops the intermittent operation for the delay time.

以上のように電源電圧が任意の基準電圧より低くなった時に、間欠動作を停止して常時動作とすることにより、間欠動作機能付きボルテージ・レギュレータの安定動作を実現できる。   As described above, when the power supply voltage becomes lower than an arbitrary reference voltage, the stable operation of the voltage regulator with the intermittent operation function can be realized by stopping the intermittent operation and always operating.

本発明の第１の実施例の間欠動作機能付きボルテージ・レギュレータのブロック図である。1 is a block diagram of a voltage regulator with an intermittent operation function according to a first embodiment of the present invention. 本発明の第２の実施例の間欠動作機能付きボルテージ・レギュレータのブロック図である。It is a block diagram of the voltage regulator with an intermittent operation | movement function of the 2nd Example of this invention. 本発明の第２の実施例の間欠動作機能付きボルテージ・レギュレータのタイミングチャートである。It is a timing chart of the voltage regulator with an intermittent operation function of the 2nd example of the present invention. 従来のボルテージ・レギュレータのブロック図である。It is a block diagram of the conventional voltage regulator.

符号の説明Explanation of symbols

１、２３ 電圧分圧回路
２、２０ 基準電圧回路
３ エラーアンプ
５ コンパレータ
９ 遅延回路 1, 23 Voltage divider circuit 2, 20 Reference voltage circuit 3 Error amplifier 5 Comparator 9 Delay circuit

Claims (3)

少なくともエラーアンプと、基準電圧回路と、出力トランジスタからなり間欠動作機能を有したボルテージ・レギュレータにおいて、前記間欠動作機能の制御手段を具備したことを特徴とするボルテージ・レギュレータ。   A voltage regulator comprising at least an error amplifier, a reference voltage circuit, and an output transistor and having an intermittent operation function, wherein the voltage regulator includes a control means for the intermittent operation function. 前記制御手段は電圧検出回路を具備し、前記電圧検出回路は電源電圧が低下したことを検出して、前記間欠動作機能を停止することを特徴とする請求項1記載のボルテージ・レギュレータ。   2. The voltage regulator according to claim 1, wherein the control means includes a voltage detection circuit, and the voltage detection circuit detects that the power supply voltage has dropped and stops the intermittent operation function. 前記制御手段は電圧検出回路と遅延回路を具備し、前記電圧検出回路は電源電圧が低下したことを検出して、前記遅延回路による遅延時間において前記間欠動作機能を停止することを特徴とする前期請求項1記載のボルテージ・レギュレータ。   The control means includes a voltage detection circuit and a delay circuit, and the voltage detection circuit detects that the power supply voltage has dropped, and stops the intermittent operation function in a delay time by the delay circuit. The voltage regulator according to claim 1.
JP2005043335A 2005-02-21 2005-02-21 Voltage regulator Withdrawn JP2006228076A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
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
JPH01296323A (en) * 1988-05-24 1989-11-29 Nissan Motor Co Ltd Power source device
JPH05119855A (en) * 1991-10-29 1993-05-18 Nec Corp Series regulator
JPH0651909U (en) * 1992-12-11 1994-07-15 日本無線株式会社 DC constant voltage circuit
JPH10111723A (en) * 1996-10-04 1998-04-28 Seiko Epson Corp Voltage stabilizing circuit
JP2000132250A (en) * 1998-10-26 2000-05-12 Hitachi Ltd External bus controller, display device equipped with the same and power control system therefor
JP2003033018A (en) * 2001-07-13 2003-01-31 Fuji Electric Co Ltd Method and device of controlling dc/dc converter

Patent Citations (7)

* Cited by examiner, † Cited by third party
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
JPH01296323A (en) * 1988-05-24 1989-11-29 Nissan Motor Co Ltd Power source device
JPH05119855A (en) * 1991-10-29 1993-05-18 Nec Corp Series regulator
JPH0651909U (en) * 1992-12-11 1994-07-15 日本無線株式会社 DC constant voltage circuit
JPH10111723A (en) * 1996-10-04 1998-04-28 Seiko Epson Corp Voltage stabilizing circuit
JP2000132250A (en) * 1998-10-26 2000-05-12 Hitachi Ltd External bus controller, display device equipped with the same and power control system therefor
JP2003033018A (en) * 2001-07-13 2003-01-31 Fuji Electric Co Ltd Method and device of controlling dc/dc converter

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