JPS6030157B2 - Multi-output switching power supply circuit - Google Patents
Multi-output switching power supply circuitInfo
- Publication number
- JPS6030157B2 JPS6030157B2 JP55074482A JP7448280A JPS6030157B2 JP S6030157 B2 JPS6030157 B2 JP S6030157B2 JP 55074482 A JP55074482 A JP 55074482A JP 7448280 A JP7448280 A JP 7448280A JP S6030157 B2 JPS6030157 B2 JP S6030157B2
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- switching power
- output
- supply circuit
- noise
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Direct Current Feeding And Distribution (AREA)
- Devices For Supply Of Signal Current (AREA)
Description
【発明の詳細な説明】
本発明は時分割形電話交換機の加入者回路等の低雑音を
要求される多出力スイッチング電源回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-output switching power supply circuit that requires low noise, such as a subscriber circuit of a time division telephone exchange.
従来、この種の電源には個々の単出力電源を複数個用い
るか、あるいはクロック周波数を同期させた多出力スイ
ッチング電源を用いていた。Conventionally, this type of power supply has used a plurality of individual single-output power supplies or a multi-output switching power supply with synchronized clock frequencies.
しかしながら、前者は複数の標準化された電源を用いる
為、そのスイッチング周波数はほぼ同じになり得るが複
数個の電源間におけるスイッチング周波数の僅かな偏差
によってビート雑音の発生を招く。したがって、音声帯
城（Ｃメッセージフィル夕，鮒ＨＺフラットフィル夕）
での雑音に対拠するため加入者回路側の電源フィル夕に
高性能な低周波（低域通過）フィル夕を設ける必要があ
る。一方、後者はスイッチング周波数が完全に同期して
いる為、上述したようなビート雑音の発生およびこれに
よる音声帝域雑音の問題はないが、入出力をフローティ
ングとする電源の場合は基準発振器，パルス幅制御回路
，および主スイッチングトランジスタの駆動回路等を入
力側に設置する必要があり、誤差増幅器等の検出回路が
出力側に設置される為回路は必然的に個別部品によって
構成される。よって、この方式はスイッチング電源制御
回路部をＬＳＩ化できず構成部品点数が増大するため電
源の小形化に限度がある。本発明の目的は、それぞれの
スイッチング電源回路部のスイッチング周波数を予め所
定間隔ずらせて設定し非同期形の多出力スイッチング電
源を構成することにより、音声帯城のビート雑音を抑制
すると共に、制御回路部のＬＳＩ化を可能として小形且
つ低雑音の多出力スイッチング電源回路を提供すること
にある。本発明は個々にスイッチング制御される複数の
スイッチング電源のスイッチング周波数を異なる値に設
定し、複数の電源回路間のビート雑音の最低周波数を通
話路帯域（Ｃメッセージフィル夕，雛日２フラットフィ
ル夕）より高周波に規定した多出力スイッチング電源回
路である。However, since the former uses a plurality of standardized power supplies, their switching frequencies can be almost the same, but a slight deviation in switching frequency between the plurality of power supplies causes beat noise. Therefore, the audio obi castle (C message fill evening, Funa HZ flat fill evening)
In order to counteract the noise generated by the subscriber circuit, it is necessary to install a high-performance low-frequency (low-pass) filter in the power supply filter on the subscriber circuit side. On the other hand, in the latter case, the switching frequencies are completely synchronized, so there is no problem with the generation of beat noise and the resulting audio noise as described above, but in the case of a power supply with floating input and output, the reference oscillator, pulse Since the width control circuit, the main switching transistor drive circuit, etc. must be installed on the input side, and the detection circuit such as an error amplifier is installed on the output side, the circuit is necessarily constructed of individual components. Therefore, in this method, the switching power supply control circuit section cannot be integrated into an LSI, and the number of component parts increases, so there is a limit to miniaturization of the power supply. An object of the present invention is to suppress beat noise in the audio band by setting the switching frequencies of the respective switching power supply circuit sections at predetermined intervals to configure an asynchronous multi-output switching power supply, and to suppress beat noise in the control circuit section. An object of the present invention is to provide a small, low-noise multi-output switching power supply circuit that can be integrated into an LSI. The present invention sets the switching frequencies of a plurality of switching power supplies whose switching is controlled individually to different values, and sets the lowest frequency of beat noise between the plurality of power supply circuits to a communication path band (C message filter, Hinabi 2 flat filter, ) This is a multi-output switching power supply circuit specified for higher frequencies.
次に、本発明の実施例について図面を参照して説明する
。Next, embodiments of the present invention will be described with reference to the drawings.
第１図は本発明の対象となる独立制御形多出力スイッチ
ング電源回路の構成を示すブロック図、第２図は第１図
に示すスイッチング電源回路の雑音分布を示すスペクト
ル図である。FIG. 1 is a block diagram showing the configuration of an independently controlled multi-output switching power supply circuit to which the present invention is applied, and FIG. 2 is a spectrum diagram showing the noise distribution of the switching power supply circuit shown in FIG. 1.
第１図に示すように、２出力電源回路構成は入力側ライ
ンフィルターと、２つのＤＣ−ＤＣコンバータ２，４と
、２つの電源制御回路３，５と、入力電源端子６と、第
１の出力端子７と、第２の出力端子８と、入力ラインフ
ィルタ出力端子９とを含む。第１図において、２つのコ
ンバータ２，４の変換周波数を各々ｆ，，ｆ２とすると
、この多出力スイッチング電源回路の雑音スペクトルの
基本波成分は各々のスイッチング電源が間欠動作を行わ
ない領域では第２図に示すように、各コンバータの変換
周波数ｆ，，ｆ２及びそのビート周波数（ら−ｆ，），
（ｆ，十ｆ２）の４成分となる。コンバータの変換周波
数は通常２０ＫＨＺ以上となっており、可聴周波数以上
に設定されている為、ｆ，，ｆ２，（ｆ，十ｆ２）の各
成分は音声帯城以上となっており音声帯城（特にＣメッ
セージ，靴ＨＺフラット雑音等の通話路帯城評価雑音）
には無関係である。しかしながら、（ら−ｆ，）の周波
数成分は同じシリーズとして標準化された電源群では通
常同一周波数に設定されている為、最低ＯＨＺ〜最大周
波数酸定偏差までの低周波成分を持つ。通話路系電源に
要求される電源評価雑音は例えばＣメッセ‐ジ１幻Ｂｍ
ｃ（−７＆旧ｍ），雛ＨＺフラット２４ｄＢｒｍ（一６
６旧ｍ）以下と極めて低レベルである為、通話路帯域内
に基本波成分を持つ通常のスイッチング電源では、この
要求を満足することができない。この対策として従来の
電源では電源出力側に高性能の低周波フィル夕を設け、
かつ電源の入力フィル夕を強化又は各コンバータごとに
分割して入力側からのコンバータ間干渉を防ぐ方式をと
っていた。本発明は多出力スイッチング電源回路の基本
変換周波数を個々に設定することにより（ら−ｆ，）の
ビート雑音成分の最低周波数を音声帯城（又は通話路帯
城）以上となるようにして従来の高性能出力フィル夕を
不要とするとともに入力フィル夕を簡素化した低雑音多
出力スイッチング電源回路を実現する。なお、この発明
は３出力以上の電源回路においても同様に変換周波数を
予めずらして設定すれば同様に電源回路を構成できる。
詳述するならば、ｎ出力電源の場合の変換周波数の設定
は次のように行う。As shown in FIG. 1, the two-output power supply circuit configuration includes an input side line filter, two DC-DC converters 2 and 4, two power supply control circuits 3 and 5, an input power supply terminal 6, and a first It includes an output terminal 7 , a second output terminal 8 , and an input line filter output terminal 9 . In Fig. 1, if the conversion frequencies of the two converters 2 and 4 are respectively f, , f2, then the fundamental wave component of the noise spectrum of this multi-output switching power supply circuit will be approximately As shown in Figure 2, the conversion frequency f,, f2 of each converter and its beat frequency (ra-f,),
There are four components: (f, 10f2). The conversion frequency of the converter is usually 20 KHz or higher, which is set above the audible frequency, so each component of f,, f2, (f, 10f2) is above the audio band range ( In particular, communication channel evaluation noise such as C messages, shoe HZ flat noise, etc.)
is irrelevant. However, since the frequency component of (ra-f,) is usually set to the same frequency in power supply groups standardized as the same series, it has a low frequency component from the lowest OHZ to the highest frequency constant deviation. The power evaluation noise required for the communication line power supply is, for example, C message 1 phantom Bm.
c (-7 & old m), chick HZ flat 24dBrm (-6
Since the level is extremely low (below 6 old m), a normal switching power supply having a fundamental wave component within the channel band cannot satisfy this requirement. As a countermeasure for this, conventional power supplies are equipped with a high-performance low-frequency filter on the power output side.
In addition, the input filter of the power supply is strengthened or divided for each converter to prevent interference between converters from the input side. The present invention sets the basic conversion frequency of the multi-output switching power supply circuit individually to make the lowest frequency of the beat noise component of (ra-f,) higher than the voice band (or communication path band), which was conventional. To realize a low-noise multi-output switching power supply circuit that eliminates the need for a high-performance output filter and simplifies the input filter. Note that, according to the present invention, a power supply circuit having three or more outputs can be configured in the same way by shifting the conversion frequency in advance and setting it.
To be more specific, the setting of the conversion frequency in the case of an n-output power supply is performed as follows.
つまり、ｎ個のコンパ−タ変換周波数をｆ．・・・・・
・ｆｎとすると、■ 第１次ビート周波数制限音声帯城
＜ｌｆｉ−ｆｉｌ（ｉ≠ｊ、１，ｊ＝１〜ｎ）■ 第２
次ビート周波数制限音声帯域＜ｌｆｈ−ｆｉｌ−ｌｆｉ
一触ｌ（ｈキｉ，ｊ≠ｋ、ｈ，ｉ，ｊ，ｋ＝１〜ｎ、ｈ
二ｊかつｉ：ｋ，
ｈ＝ｋかつｉ＝ｊを除く）
なお、高次ビート周波数の設定は電源に要求される雑音
レベルに応じて行うが、通常の要求条件では第１次ビー
ト雑音か第２次ビート雑音程度までで性能は満足される
。In other words, n converter conversion frequencies are set to f.・・・・・・
・If fn, ■ 1st beat frequency limit voice band castle < lfi-fil (i≠j, 1, j = 1 to n) ■ 2nd
Next beat frequency limited audio band < lfh-fil-lfi
One touch (hkii, j≠k, h,i,j,k=1~n,h
2j and i:k, h=k and i=j) The higher-order beat frequency is set according to the noise level required of the power supply, but under normal requirements, the first-order beat noise Performance is satisfied up to the level of second-order beat noise.
また、このビート雑音は個々の電源回路の制御回路に給
電する補助電源回路に対しても考慮する必要がある。本
発明は以上説明したように、独立に制御される複数のス
イッチング電源回路で構成する多出力スイッチング電源
回路において、個々のスイッチング周波数を所定間隔ず
らせて設定することにより、電源相互間の低周波ビート
雑音の周波数成分を音声帯城以上として音声帯城での低
雑音多出力電源を実現できる上に、従来の多出力スイッ
チング電源回路に比べ、出力側低周波フィル夕を不要と
し、且つ入力側ラインフィル夕を簡素化できるさらに、
本発明によれば、制御山ＳＩ等の高集積部品を使用でき
回路の小形化を図かることもできる。Furthermore, this beat noise must also be taken into account for the auxiliary power supply circuits that feed power to the control circuits of the individual power supply circuits. As explained above, in a multi-output switching power supply circuit composed of a plurality of independently controlled switching power supply circuits, the present invention sets the individual switching frequencies at predetermined intervals to avoid low-frequency beats between the power supplies. In addition to making it possible to realize a low-noise multi-output power supply in the audio band by making the noise frequency component higher than the audio band, it also eliminates the need for a low-frequency filter on the output side compared to conventional multi-output switching power supply circuits, and eliminates the need for a low-frequency filter on the input side. Additionally, it can simplify filtering
According to the present invention, highly integrated components such as the control unit SI can be used, and the circuit can be miniaturized.
第１図は本発明による多出力スイッチング電源回路の一
実施例を示すブロック図、第２図は第１図に示す多出力
スイッチング電源回路の雑音成分を示すスペクトル図で
ある。
１・・・・・・入力ラインフィル夕、２・・・・・・第
１のＤＣ−ＤＣコンバータ、３……第１の電源制御回路
、４…・・・第２のＤＣ−ＤＣコンバータ、５・・・・
・・第２の電源制御回路、６・・・・・・入力電源端子
、７・・・・・・第１の電源出力端子、８・・…・第２
の電源出力端子、９・・・・・・入力ラインフィルタ出
力端子。
策／図第２図FIG. 1 is a block diagram showing an embodiment of a multi-output switching power supply circuit according to the present invention, and FIG. 2 is a spectrum diagram showing noise components of the multi-output switching power supply circuit shown in FIG. 1... Input line filter, 2... First DC-DC converter, 3... First power supply control circuit, 4... Second DC-DC converter, 5...
...Second power supply control circuit, 6...Input power supply terminal, 7...First power supply output terminal, 8...Second power supply terminal
power output terminal, 9... Input line filter output terminal. Strategy/Figure 2
Claims (1)
流電圧を出力する複数個のＤＣ−ＤＣコンバータと、こ
れら複数個のＤＣ−ＤＣコンバータ対応に設けられてそ
れぞれを独立にスイツチング制御する複数個の制御回路
とを備え、該複数個の制御回路のそれぞれのスイツチン
グ周波数の差を通話路帯域より大きくしたことを特徴と
する多出力スイツチング電源回路。1. A plurality of DC-DC converters that are commonly connected to an input filter and each output a predetermined DC voltage, and a plurality of controls that are provided corresponding to the plurality of DC-DC converters and independently switch and control each of them. What is claimed is: 1. A multi-output switching power supply circuit comprising: a multi-output switching power supply circuit, characterized in that the difference between the switching frequencies of the plurality of control circuits is greater than the communication path band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55074482A JPS6030157B2 (en) | 1980-06-03 | 1980-06-03 | Multi-output switching power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55074482A JPS6030157B2 (en) | 1980-06-03 | 1980-06-03 | Multi-output switching power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56169987A JPS56169987A (en) | 1981-12-26 |
| JPS6030157B2 true JPS6030157B2 (en) | 1985-07-15 |
Family
ID=13548531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55074482A Expired JPS6030157B2 (en) | 1980-06-03 | 1980-06-03 | Multi-output switching power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6030157B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002237395A (en) * | 2001-02-13 | 2002-08-23 | Koito Mfg Co Ltd | Discharge lamp lighting device |
| CN103546023B (en) * | 2013-10-31 | 2015-09-30 | 烽火通信科技股份有限公司 | A kind of method suppressing multiple Switching Power Supply beat frequency noise |
-
1980
- 1980-06-03 JP JP55074482A patent/JPS6030157B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56169987A (en) | 1981-12-26 |
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