JPS59178968A - Power source voltage switching circuit - Google Patents

Power source voltage switching circuit

Info

Publication number
JPS59178968A
JPS59178968A JP5179083A JP5179083A JPS59178968A JP S59178968 A JPS59178968 A JP S59178968A JP 5179083 A JP5179083 A JP 5179083A JP 5179083 A JP5179083 A JP 5179083A JP S59178968 A JPS59178968 A JP S59178968A
Authority
JP
Japan
Prior art keywords
switching
power supply
power
transistor
supply voltage
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
JP5179083A
Other languages
Japanese (ja)
Inventor
Masaaki Kanashiki
金「しき」 正明
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 JP5179083A priority Critical patent/JPS59178968A/en
Publication of JPS59178968A publication Critical patent/JPS59178968A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac

Abstract

PURPOSE:To lead high and low power voltages by switching by applying a switching element to a switching regulator, and controlling ON/OFF the switching element in response to the switching of the operation mode. CONSTITUTION:A transistor 12 for switching a power voltage is inserted between the power input terminal 8 in a switching regulator and the secondary coil of a switching power transformer 3. ''H'' or ''L'' switching control signal is applied through a resistor 14 to the control input terminal 13 to the base of the transistor 12. High and low DC output voltages are led to the power output terminals 10, 10' in response to the ON/OFF of the transistor 12.

Description

【発明の詳細な説明】 〈産業上の利用分野〉 本発明は電子機器の動作モード【こ応じてその電源電圧
を切換えることができる電源電圧切挽回げ各に関するも
のである。
DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a power supply voltage recovery system that can switch the power supply voltage according to the operating mode of an electronic device.

例えばビデオテープレコーダのキャプスタンモータ駆動
回路においては、通常の再生モード時と高速再生モード
時とで異なる電源電圧を切、・功えて供給する必要かあ
る。
For example, in a capstan motor drive circuit of a video tape recorder, it is necessary to turn off and supply different power supply voltages during normal playback mode and during high-speed playback mode.

〈従来技術と問題点〉 そこで従来から斯種の各モードで異なる電源電圧を必要
とする電子機器においては、昇圧と降圧の両機能を有す
る2段構成からなる複雑なスイッチングレギュレータ回
路を用い、モード切換に応じて何れか一方の機能を作動
し異なる所要の電源電圧を得ていた。
<Prior art and problems> Conventionally, electronic equipment of this kind that requires different power supply voltages for each mode uses a complex switching regulator circuit consisting of a two-stage configuration with both step-up and step-down functions. Depending on the switching, one of the functions was activated to obtain a different required power supply voltage.

く目 的〉 本発明はこのような点に鑑みなされたものであり、比較
的簡単な構成で動作モードの変化に応じてその電源電圧
を効率よく切換えることができる電源電圧切換回路を提
供するものである。
Purpose The present invention has been made in view of the above points, and provides a power supply voltage switching circuit that can efficiently switch the power supply voltage according to changes in the operating mode with a relatively simple configuration. It is.

〈実施例〉 以下図面に示す実施例に従って本発明を説明する。第1
図は本発明の一実施例の回路構成図を示し、ここで1は
一定の周波数で且つ一定の大きさく振幅)を有するスイ
ッチングパルスを発生するスイッチングパルス発゛生器
、2は該スイッチンクパルスを増幅するスイッチング出
力トランジスタ、3はスイッチング電源トランス、4.
5は整流ダイオード、6は平滑コンデンサ、7は出力゛
磁圧調整用可変抵抗であり、これらによって通常のスイ
ッチングレギュレータ回路が構成されている。このレギ
ュレータ回路の動作は周知であるか、ここで簡単に説明
すると、電源入力端子8.8′にノくッテリー9の電圧
が印加されているとき、スイ・ノチングパルス発生器1
より発生されたスイ・ノチンクパルスがトランジスタ2
にて増幅された後、トランス3を介して整流回路に供給
され、ダイオード4.5にて整流され且つコンデンサ6
にて平滑され、この結果電源出力端)10.10’間に
安定化された直流出力電圧V。が導出され、負荷11ン
供給される。この場合出力電圧調整用可変抵抗7を調整
すれば、スイッチングノくルス発生器1iこ帰還される
直流電圧が可変され、このときスイッチングパルス発生
器1より発生されるスイ・ノチングパルスのデユーティ
比が変化され、これ【こ応じて電源出力端子10.10
’に導出される出力・電圧V。の値も変化される。
<Examples> The present invention will be described below according to examples shown in the drawings. 1st
The figure shows a circuit configuration diagram of an embodiment of the present invention, where 1 is a switching pulse generator that generates a switching pulse having a constant frequency and a constant amplitude, and 2 is a switching pulse generator that generates a switching pulse having a constant frequency and a constant amplitude. 3 is a switching power supply transformer; 4 is a switching output transistor that amplifies the output voltage;
5 is a rectifier diode, 6 is a smoothing capacitor, and 7 is a variable resistor for adjusting the output magnetic pressure, and these constitute a normal switching regulator circuit. Is the operation of this regulator circuit well known? To briefly explain here, when the voltage of the notching pulse generator 1 is applied to the power input terminal 8, 8', the switching pulse generator 1
The switch pulse generated by transistor 2
After being amplified by the transformer 3, it is supplied to the rectifier circuit, rectified by the diode 4.
As a result, the DC output voltage V is stabilized between 10 and 10' at the power supply output terminal. is derived and supplied to the load 11. In this case, by adjusting the variable resistor 7 for adjusting the output voltage, the DC voltage fed back to the switching pulse generator 1i can be varied, and at this time, the duty ratio of the switching pulse generator 1 is changed. and this [accordingly, the power output terminal 10.10
Output/voltage V derived from '. The value of is also changed.

本発明では上記のような一般のスイッチングレギュレー
タ回路にさらに1個のスイッチングトランジスタを追加
し、このトランジスタをモード切換に呼応してオンオフ
制御することにより、動作モードに応じて電源出力端子
]、0.10’に異なる直流出力電圧を導出するもので
ある。
In the present invention, one switching transistor is further added to the general switching regulator circuit as described above, and this transistor is controlled on and off in response to mode switching, thereby controlling the power supply output terminals], 0. 10' to derive different DC output voltages.

即ち本実施例では上記スイッチングレギュレータ回路に
おける電源入力端子8とスイ・ノチンク電源トランス3
の2次コイルとの間に電源電圧切換用のトランジスタ1
2を1重大し、このトランジスタ12のベースに制御入
力端子13より抵抗14を介してIT HJ+または′
L″の切換制御信号を印加するようになしたものである
That is, in this embodiment, the power supply input terminal 8 and the power supply transformer 3 in the switching regulator circuit are connected to each other.
Transistor 1 for switching the power supply voltage is connected between the secondary coil of
2 by 1, and connect IT HJ+ or ' to the base of this transistor 12 from the control input terminal 13 through the resistor 14.
A switching control signal of L'' is applied.

そしていま上記のように構成された電源電圧切換回路を
例えばビデオテープレコーダのキャプスタンモータ駆動
回路に適用した場合には、ます通常の再生モード時には
制御入力端子13に’ H”なる制御信号を印加する。
Now, when the power supply voltage switching circuit configured as described above is applied to, for example, a capstan motor drive circuit of a video tape recorder, a control signal of 'H' is applied to the control input terminal 13 during normal playback mode. do.

このとき上記電源電圧切換用トランジスタ12はカット
オフ状態にあるため、既述したスイッチンクレギュレー
タ動作tこよりスイッチングレギュレータ回路内で発生
された第2図(atに示すスイッチングパルスが整流平
滑され、電源出力端子10.IC)’には第2図([)
lに示すような比較的低い直流出力電圧V。が導出され
る。従ってこの場合、負荷11となるキャプスタンモー
タ駆動回路はこの比較的低い出力電圧で駆動される。
At this time, the power supply voltage switching transistor 12 is in a cut-off state, so the switching pulse shown in FIG. Terminal 10.IC)' is shown in Figure 2 ([)
A relatively low DC output voltage V as shown in l. is derived. Therefore, in this case, the capstan motor drive circuit serving as the load 11 is driven with this relatively low output voltage.

一方上記通常再生モードから高速再生モードに切換えた
場合には、制御入力端子13にパL′″なる制御信号を
印加する。このとき電源電圧切換用トランジスタ12は
オン状態となるため、電源出力端子10.10’には第
2図(C)に示す如くスイッチングレギュレータ回路内
で得られる整流出力電圧V。′にバッテリー9による電
源入力電圧V1か重畳された比較的高い直流出力電圧が
導出される。従ってこの場合キャプスタンモータ駆動回
路は比較的高い直流出力電圧で駆動されることになる。
On the other hand, when switching from the normal playback mode to the high-speed playback mode, a control signal called "P" is applied to the control input terminal 13. At this time, the power supply voltage switching transistor 12 is in the on state, so the power supply output terminal At 10.10', a relatively high DC output voltage is derived, which is obtained by superimposing the power supply input voltage V1 from the battery 9 on the rectified output voltage V.' obtained within the switching regulator circuit as shown in FIG. 2(C). Therefore, in this case, the capstan motor drive circuit will be driven with a relatively high DC output voltage.

本発明の電源電圧切換回路は上記したビデオテープレコ
ーダのキャプスタンモータ駆動回路ばかりでなく、動作
モードに応じてその電源電圧の切換えを必要とする他の
回路や他の電子機器にももちろん適用することが可能で
ある。
The power supply voltage switching circuit of the present invention is of course applicable not only to the capstan motor drive circuit of the video tape recorder described above, but also to other circuits and other electronic devices that require switching of the power supply voltage depending on the operating mode. Is possible.

く効 果〉・ 本発明の電源電圧切換回路によれば、上記のようにスイ
ッチングパルス発生遷、スイッチンク電源トランス、電
流平滑回路等からなる一般のスイッチングレギュレータ
回路に1個のスイッチング素子を追加し、動作モードの
切換に応動してこのスイッチング素子をオンオフ制御す
ることによって高、低異なる2種の電源電圧を切換えて
導出することができる。
Effects>- According to the power supply voltage switching circuit of the present invention, one switching element is added to the general switching regulator circuit consisting of the switching pulse generation process, switching power transformer, current smoothing circuit, etc. as described above. By controlling the switching element on and off in response to switching of the operation mode, two different power supply voltages, high and low, can be switched and derived.

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

第1図は本発明の一実施例の回路構成図、第2図は同実
施例の動作説明のための波形図である。 1・・・スイッチングパルス発生器、2・・スイッチン
ク出力トランジスタ、3・・・スイッチング電源トラン
ス殻4.5・・・整流ダイオード、6・・・平滑コンデ
ンサζ匂8..+ 、 8 、・・・電源入力端子、9
・・・バッテリー、10.10’・・・電源出力端子、
12・・・電源電圧切換用トランジスタ。
FIG. 1 is a circuit configuration diagram of an embodiment of the present invention, and FIG. 2 is a waveform diagram for explaining the operation of the embodiment. 1... Switching pulse generator, 2... Switching output transistor, 3... Switching power supply transformer shell 4.5... Rectifying diode, 6... Smoothing capacitor 8. .. +, 8,...power input terminal, 9
...Battery, 10.10'...Power output terminal,
12...Transistor for switching power supply voltage.

Claims (1)

【特許請求の範囲】[Claims] 1 スイッチンクパルス発生器、スイ・yチンク゛亀源
トランス、整流平滑回路等からなるスイ・クチンダレギ
ュレーク回路において、電源入力端子と前記スイッチン
グ電源トランスの2次側との間に動作モードのり換に応
動してオンオフ制0される電源電圧切換用のスイ・ソチ
ング素子を挿入し、電源出力端子より動作モードに応じ
て高低2種の電源電圧を得ることを特徴とする電源電圧
切換回路。
1. In a switch regulator circuit consisting of a switching pulse generator, switch generator transformer, rectifier smoothing circuit, etc., the operation mode is switched between the power input terminal and the secondary side of the switching power transformer. A power supply voltage switching circuit characterized by inserting a switching element for switching the power supply voltage which is turned on and off in response to the power supply voltage, and obtaining two types of power supply voltages, high and low, from the power supply output terminal according to the operating mode.
JP5179083A 1983-03-26 1983-03-26 Power source voltage switching circuit Pending JPS59178968A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5179083A JPS59178968A (en) 1983-03-26 1983-03-26 Power source voltage switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5179083A JPS59178968A (en) 1983-03-26 1983-03-26 Power source voltage switching circuit

Publications (1)

Publication Number Publication Date
JPS59178968A true JPS59178968A (en) 1984-10-11

Family

ID=12896733

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5179083A Pending JPS59178968A (en) 1983-03-26 1983-03-26 Power source voltage switching circuit

Country Status (1)

Country Link
JP (1) JPS59178968A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62168791U (en) * 1986-04-12 1987-10-26
JPS63302217A (en) * 1986-06-25 1988-12-09 Toshiyasu Suzuki Ignition device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62168791U (en) * 1986-04-12 1987-10-26
JPH0537668Y2 (en) * 1986-04-12 1993-09-22
JPS63302217A (en) * 1986-06-25 1988-12-09 Toshiyasu Suzuki Ignition device

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