JPS60126720A - Automatic power source voltage changing circuit - Google Patents

Automatic power source voltage changing circuit

Info

Publication number
JPS60126720A
JPS60126720A JP23563483A JP23563483A JPS60126720A JP S60126720 A JPS60126720 A JP S60126720A JP 23563483 A JP23563483 A JP 23563483A JP 23563483 A JP23563483 A JP 23563483A JP S60126720 A JPS60126720 A JP S60126720A
Authority
JP
Japan
Prior art keywords
circuit
voltage
power supply
power source
diode
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.)
Pending
Application number
JP23563483A
Other languages
Japanese (ja)
Inventor
Kengo Ohashi
大橋　堅固
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP23563483A priority Critical patent/JPS60126720A/en
Priority to BR8406363A priority patent/BR8406363A/en
Publication of JPS60126720A publication Critical patent/JPS60126720A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/125—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M3/135—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

PURPOSE:To obtain efficiently nearly constant DC voltage by detecting whether AC power source input voltage is 110V or 220V by an AC power source input voltage detecting circuit and on/off controlling automatically a switching element according to the detected output. CONSTITUTION:The input terminal of a bridge rectifier circuit 9 consisting of diodes 5, 6-8 is connected between AC power source input terminals 1, 2. The connecting point of diodes 5, 6 in the circuit 9 is grounded and the connecting point of diodes 7, 8 is grounded through a condenser 10. Further, the connecting point if diodes 6, 8 in the circuit 9 is grounded through a condenser 11 and the DC circuit of an Si control rectifier cell 12. A diode 13 for reverse current is inserted in parallel to the element 12. An AC power source input voltage detecting circuit 32 is formed of a transistor TR14, diode 15, Zener diode 16, and an element 17 etc., and the element 12 is on/off controlled basing on the detected output of the circuit 32.

Description

【発明の詳細な説明】 七技術分野〉 本発明は、交流電源より整流回路を介して直流電圧を得
るように構成した電源回路を使用するテレビジョン受像
機若しくはラジオ受信機等において、電圧値の異なる交
流電源を使用する際にも導出される直流電圧を一定とす
るだめの電源電圧自動切換回路に関するものである。Detailed Description of the Invention Seven Technical Fields The present invention is directed to a television receiver, a radio receiver, etc. that uses a power supply circuit configured to obtain a DC voltage from an AC power supply via a rectifier circuit. The present invention relates to an automatic power supply voltage switching circuit that keeps the derived DC voltage constant even when different AC power supplies are used.

〈従来技術〉 一般に、交流電源が例えば１１０Ｖと２２０ｖのように
相異なる複数の電源電圧が共用される地域で使用される
機器においては、切換回路を設は交流電源電圧に従って
切換えることにより異なる交流電源電圧に対しても適応
し得るように構成していた。<Prior art> In general, in equipment used in areas where multiple different AC power supply voltages are shared, such as 110V and 220V, a switching circuit is installed to switch between different AC power supplies by switching according to the AC power supply voltage. It was designed to be adaptable to voltage.

従来使用されていたこのような切換回路は、第１図に示
す如く、交流電源入力端子１，２より電源トランス３を
接続し、該トランス３の一方端を切換スイッチ４の一方
の切換端子４ａに接続し、且つトランス３の中間タップ
を導出し他方の切換端子４ｂに接続し、該スイッチ４の
固定端子４Ｃと・τ呪ンンス３の他方端間にダイオード
５’、６，７゜８よりなるブリッジ整流回路９を接続し
、ダイオード５．６の接続点を接地し、ダイオード７．
８の接続点よりコンデンサ１０の両端に直流電圧Ｅを導
出するように構成し、１１０ｖの交流電源で使用する場
合には、切換スイッチ４の一方の切換端子４ａと固定端
子４Ｃを短絡すれば、交流電源入力端子１，２より整流
回路を経て１１０ｖの直流電圧Ｅが導出され、２２０Ｖ
の交流電源で使用する場合には、切換スイッチ４の他方
の切換端子４ｂと固定端子４Ｃを短絡するように切換え
れば、他方の切換端子４Ｃが電源トランス３の中間タッ
プに接続されているため、交流電源入力端子１゜２に２
２０ｖが印加されても電源トランス３により１１０ｖに
降圧された電圧が電流回路９に供給され、該整流回路９
を経てコンデンサ１０の両端に１１０Ｖの直流電圧が導
出されることになり、切換スイッチ４を切換ることによ
り交流電源が１１０■であっても２２０Ｖであっても機
器の使用を可能としている。As shown in FIG. 1, such a conventional switching circuit connects a power transformer 3 to AC power input terminals 1 and 2, and connects one end of the transformer 3 to one switching terminal 4a of a switch 4. The center tap of the transformer 3 is led out and connected to the other switching terminal 4b, and a diode 5', 6, 7° 8 is connected between the fixed terminal 4C of the switch 4 and the other end of the .tau. A bridge rectifier circuit 9 is connected, the connection point of the diode 5.6 is grounded, and the connection point of the diode 7.
When the DC voltage E is derived from the connection point 8 to both ends of the capacitor 10, and when used with a 110V AC power source, one switching terminal 4a of the switch 4 and the fixed terminal 4C are short-circuited. A DC voltage E of 110V is derived from the AC power input terminals 1 and 2 through a rectifier circuit, and the voltage is 220V.
When used with an AC power source, if the other switching terminal 4b of the changeover switch 4 and the fixed terminal 4C are short-circuited, the other switching terminal 4C is connected to the intermediate tap of the power transformer 3. , AC power input terminal 1゜2 to 2
Even if 20V is applied, the voltage stepped down to 110V by the power transformer 3 is supplied to the current circuit 9, and the rectifier circuit 9
Through this, a DC voltage of 110V is derived across the capacitor 10, and by switching the selector switch 4, the device can be used regardless of whether the AC power source is 110V or 220V.

しかしこのような従来の回路構成によれば、電源電圧を
電源トランスにより降圧して整流回路へ供給するので、
大容量の電源トランスが必要となり、電源トランスによ
る消費電力が増大すると共・に、電源トランス自体の重
量、スペースにより機器の軽量化、小型化に支障をきた
１、ていた。However, with this conventional circuit configuration, the power supply voltage is stepped down by a power transformer and then supplied to the rectifier circuit.
A large-capacity power transformer is required, which increases power consumption by the power transformer, and the weight and space of the power transformer itself impedes efforts to reduce the weight and size of equipment.

さらにまたこの゛ような場合、電源電圧に応じて手動に
より切換スイッチを切換えなければならず、もしこの切
換を誤まれば機器が動作せずそればかりか機器内の部品
を損傷する危険すらあった。Furthermore, in such cases, it is necessary to manually change the selector switch according to the power supply voltage, and if the switch is incorrectly changed, the device may not operate, and there is even a risk of damaging the components inside the device. .

〈発明の目的〉 本発明は上述した従来の欠点に鑑みなされたものであり
、電源トランスを用いることなく且つ電源電圧に応じて
自動的に切換が行なわれる電源電圧自動切換回路を提供
するものである。<Object of the Invention> The present invention has been made in view of the above-mentioned conventional drawbacks, and an object of the present invention is to provide an automatic power supply voltage switching circuit that automatically switches according to the power supply voltage without using a power transformer. be.

〈実施例〉 以下第２図に示す実施例に従って本発明を説明する。な
お第１図と同一部分には同一符号を附記して説明する。<Example> The present invention will be described below according to an example shown in FIG. The same parts as those in FIG. 1 will be described with the same reference numerals.

　゛ まずここで交流電源入力端子１，２間にダイオード５，
６，７，８よりなるブリッジ整流回路９の入力端子を接
続し、該整流回路９の一方の出力端子即ちダイオード５
，６の接続点を接地し、他方の出力端子即ちダイオード
７．８の接続点は第１のコンデンサ１０を介して接地し
ている。゛First, connect the diode 5 between the AC power input terminals 1 and 2.
The input terminal of a bridge rectifier circuit 9 consisting of 6, 7, and 8 is connected to one output terminal of the rectifier circuit 9, that is, the diode 5.
, 6 are grounded, and the other output terminal, ie, the connection point of the diode 7.8, is grounded via the first capacitor 10.

また上記ブリッジ整流回路９の一方の入力端子即ちダイ
オード６．８の接続点を第２のコンデンサ１１とシリコ
ン制御整流素子（ＳＣＲ）１２の直勿」回路を介して接
地している。なお、また該整流素子１２と並列に逆流用
のダイオード１３を挿入している。Further, one input terminal of the bridge rectifier circuit 9, that is, the connection point of the diode 6.8 is grounded through a circuit of a second capacitor 11 and a silicon controlled rectifier (SCR) 12. Furthermore, a diode 13 for reverse current is inserted in parallel with the rectifying element 12.

さらにここでは上記の回路に加えてトランジスタ１４．
ダイオード１５．ツェナーダイオード１６゜シリコン制
御整流素子１７．その他抵抗１８〜２７及びコンデンサ
２８〜３１によって交流電源入力電圧検出回路３２を構
成し、かかる検出回路３２の検出出力に基いてシリコン
制御整流素子１２をオンオフ制御するものである。Furthermore, in addition to the above circuit, a transistor 14.
Diode 15. Zener diode 16° silicon controlled rectifier 17. The other resistors 18 to 27 and capacitors 28 to 31 constitute an AC power supply input voltage detection circuit 32, and the silicon controlled rectifier 12 is controlled to be turned on or off based on the detection output of the detection circuit 32.

次に上記のように構成される回路の電源電圧の自動切換
動作について説明すると、いま交流電源入力端子１，２
間にまず１１０Ｖの比較的低い交流電源電圧が印加され
た場合には、この交流電源電圧の大きさが上記入力電圧
検出回路３２にて検出される。即ち、まずこの交流電源
電圧がダイオ、−ド１５にて整流され、コンデンサ３１
の両端に入力電圧に応じた比較的低い直流電圧が導出さ
れる。この直流電圧は抵抗２６．２７にて分割してツェ
ナーダイオード１６の陰極に印加される。この場合分割
電圧はツェナー電圧よりも低いため、ツェナーダイオー
ド１６はカットオフ状態にありそれ故にトランジスタ１
４もまだオフ状態にある。Next, to explain the automatic switching operation of the power supply voltage of the circuit configured as above, the AC power input terminals 1 and 2
When a relatively low AC power supply voltage of 110 V is first applied during this period, the magnitude of this AC power supply voltage is detected by the input voltage detection circuit 32. That is, first, this AC power supply voltage is rectified by the diode 15, and then the capacitor 31
A relatively low DC voltage corresponding to the input voltage is derived across the terminal. This DC voltage is divided by resistors 26 and 27 and applied to the cathode of Zener diode 16. Since in this case the dividing voltage is lower than the Zener voltage, the Zener diode 16 is in the cut-off state and therefore the transistor 1
4 is still in the off state.

従ってこの場合トランジスタ１４のコレクタ電位が高い
ため、抵抗２１を介してシリコン制御整流素子１７のゲ
ート電極に比較的高いゲート電圧が印加され、これに伴
いシリコン制御整流素子１７はターンオン状態となる。Therefore, in this case, since the collector potential of the transistor 14 is high, a relatively high gate voltage is applied to the gate electrode of the silicon-controlled rectifier 17 via the resistor 21, and accordingly, the silicon-controlled rectifier 17 is turned on.

これによりシリコン制御整流素子１２のゲート電極も高
電位状態にあり該整流素子１２もまたターンオン状態に
ある。即ちこのときダイオード６．８の接続点は第２の
コンデンサ１１を介して接地される。このような結果、
入力端子１，２間に比較的低い交流電源電圧（１１０Ｖ
）が印加されている場合には、いま入力端子１側に■電
圧が印加されている半サイクルでは、このとき入力端子
１−ダイオード７−コンデンサ１〇−接地−ダイオード
６−入力端子２の経路で電流が流れてコンデンサ１０が
充電され、また入力端子２側に■電圧が印加されている
半サイクルでは、入力端子２−コンデンサ１１−整流素
子１２−接地−ダイオード５−入力端子１の経路で電流
が流れてコンデンサ１１が充電される。As a result, the gate electrode of the silicon-controlled rectifier 12 is also in a high potential state, and the rectifier 12 is also turned on. That is, at this time, the connection point of the diode 6.8 is grounded via the second capacitor 11. Such a result,
A relatively low AC power supply voltage (110V) is applied between input terminals 1 and 2.
) is being applied, in the half cycle in which ■ voltage is currently being applied to the input terminal 1 side, at this time, the path of input terminal 1 - diode 7 - capacitor 1 - ground - diode 6 - input terminal 2 In the half cycle when current flows and charges capacitor 10, and voltage is applied to input terminal 2, the path from input terminal 2 - capacitor 11 - rectifying element 12 - ground - diode 5 - input terminal 1 Current flows and capacitor 11 is charged.

さらに入力端子１側に■電圧が印加される次の半サイク
ルで入力端子１−ダイオード７−コンデンサ１〇−接地
−ダイオード１３−コンデンサ１１−入力端子２の経路
で電流が流れ、コンデンサ１０には前の半サイクルで充
電された電荷と合わせて２倍の電荷が積上げられる。Furthermore, in the next half cycle when ■ voltage is applied to the input terminal 1 side, current flows through the path of input terminal 1 - diode 7 - capacitor 1 - ground - diode 13 - capacitor 11 - input terminal 2, and the current flows in the capacitor 10. Combined with the charge charged in the previous half cycle, twice the charge is accumulated.

このような結果、倍電圧整流動作が行なわれ、出力端子
には１１０Ｖの交流電源電圧が倍電圧整流されたほぼ２
倍の直流電圧が導出される。As a result, a voltage double rectification operation is performed, and the 110V AC power supply voltage is voltage doubled and rectified at the output terminal.
Double the DC voltage is derived.

一方いま入力端子１，２間に２２０ｖの比較的高い交流
電源電圧が印加された場合には、この交流電源電圧がダ
イオード１５にて整流され、ツェナーダイオード１６の
陰極には比較的高い直流電圧が印加されるため、ツェナ
ーダイオード１６がオンされこれに伴いトランジスタ１
４もオン状態となる。これによりトランジスタ１４のコ
レクタ電位が低下するため、シリコン制御整流素子１７
−はカットオフ状態となり、これに伴い整流素子１２も
またカットオフ状態に保たれこのときコンデンサ１１の
一端が開放状態となる。このような結果上記回路はブリ
ッジ整流回路９とコンデンサ１０とによって全波整流回
路が形成され、出力端子には直流電圧Ｅが導出される。On the other hand, when a relatively high AC power supply voltage of 220V is applied between the input terminals 1 and 2, this AC power supply voltage is rectified by the diode 15, and a relatively high DC voltage is applied to the cathode of the Zener diode 16. Therefore, the Zener diode 16 is turned on and the transistor 1 is turned on.
4 is also turned on. As a result, the collector potential of the transistor 14 decreases, so that the silicon-controlled rectifier 17
- is in the cutoff state, and accordingly, the rectifying element 12 is also kept in the cutoff state, and at this time, one end of the capacitor 11 is in the open state. As a result, in the circuit described above, a full-wave rectifier circuit is formed by the bridge rectifier circuit 9 and the capacitor 10, and a DC voltage E is derived from the output terminal.

く効　果〉 以上のように本発明の電源電圧自動切換回路によれば、
交流電源入力電圧が１１０ｖであるか２２０ｖであるか
が交流電源入力電圧検出回路によって検知され、この検
出出力に応じてスイッチング素子が自動的にオンオフ制
御され、出力端子それ故に本発明によれば、従来のよう
に電源トランスを用いる必要がないばかりでなく、電源
電圧に応じて切換操作を行なう煩られしさを解消するこ
とができる。Effect> As described above, according to the power supply voltage automatic switching circuit of the present invention,
The AC power supply input voltage detection circuit detects whether the AC power supply input voltage is 110V or 220V, and the switching element is automatically controlled on and off according to this detection output, and the output terminal, therefore, according to the present invention, Not only is there no need to use a power transformer as in the past, but the hassle of switching operations depending on the power supply voltage can be eliminated.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は従来の回路図、第２図は本発明の１実施例の回
路図である。 １．２・・・交流電源入力端子、９・・・ブリッジ整流
回路、１０・・・第１のコンデンサ、１１・・・第２の
コンデンサ、１２・・・シリコン制御整流素子、３２・
・交流電源入力電圧検出回路。FIG. 1 is a conventional circuit diagram, and FIG. 2 is a circuit diagram of one embodiment of the present invention. 1.2... AC power supply input terminal, 9... Bridge rectifier circuit, 10... First capacitor, 11... Second capacitor, 12... Silicon controlled rectifier, 32...
・AC power supply input voltage detection circuit.

Claims (1)

【特許請求の範囲】 １、交流電源よりブリッジ整流回路を介して直流電圧を
得る電源回路において、前記整流回路の入力端子間に交
流電源入力電圧を印加し、前記ブリッジ整流回路の一方
の出力端子を接地し他方の出力端子は第１のコンデンサ
を介して接地し、また前記整流回路の一方の入力端子は
第２のコンデンサとスイッチング素子との直列回路を介
して接地し、さらに前記交流電源入力電圧の大きさを検
出しこの検出値に応じて前記スイッチング素子をオンオ
フ制御することを特徴とする電源電圧自動切換回路。 ２、前記スイッチング素子としてシリコン制御整流素子
を用いてなる前記特許請求の範囲１記載の電源電圧自動
切換回路。[Claims] 1. In a power supply circuit that obtains a DC voltage from an AC power supply via a bridge rectifier circuit, an AC power supply input voltage is applied between the input terminals of the rectifier circuit, and one output terminal of the bridge rectifier circuit. is grounded, the other output terminal is grounded via a first capacitor, one input terminal of the rectifier circuit is grounded via a series circuit of a second capacitor and a switching element, and the AC power input An automatic power supply voltage switching circuit characterized in that the circuit detects the magnitude of the voltage and controls the switching element on and off according to the detected value. 2. The power supply voltage automatic switching circuit according to claim 1, which uses a silicon-controlled rectifying element as the switching element.
JP23563483A 1983-12-12 1983-12-12 Automatic power source voltage changing circuit Pending JPS60126720A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP23563483A JPS60126720A (en) 1983-12-12 1983-12-12 Automatic power source voltage changing circuit
BR8406363A BR8406363A (en) 1983-12-12 1984-12-10 ELECTROMOTRIZ VOLTAGE SELF-SWITCHING CIRCUIT

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23563483A JPS60126720A (en) 1983-12-12 1983-12-12 Automatic power source voltage changing circuit

Publications (1)

Publication Number Publication Date
JPS60126720A true JPS60126720A (en) 1985-07-06

Family

ID=16988922

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23563483A Pending JPS60126720A (en) 1983-12-12 1983-12-12 Automatic power source voltage changing circuit

Country Status (2)

Country Link
JP (1) JPS60126720A (en)
BR (1) BR8406363A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102122677B1 (en) * 2019-02-06 2020-06-12 주식회사 에프램 A Sensing Signal Control Circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102122677B1 (en) * 2019-02-06 2020-06-12 주식회사 에프램 A Sensing Signal Control Circuit

Also Published As

Publication number Publication date
BR8406363A (en) 1985-10-08

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