JPH0595669A - Voltage converter - Google Patents

Voltage converter

Info

Publication number
JPH0595669A
JPH0595669A JP3253480A JP25348091A JPH0595669A JP H0595669 A JPH0595669 A JP H0595669A JP 3253480 A JP3253480 A JP 3253480A JP 25348091 A JP25348091 A JP 25348091A JP H0595669 A JPH0595669 A JP H0595669A
Authority
JP
Japan
Prior art keywords
terminal
analog switch
voltage
common
changeover
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
JP3253480A
Other languages
Japanese (ja)
Inventor
Takeshi Fujita
武 藤田
Mitsuo Tamura
光夫 田村
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP3253480A priority Critical patent/JPH0595669A/en
Publication of JPH0595669A publication Critical patent/JPH0595669A/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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0083—Converters characterised by their input or output configuration
    • H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs

Abstract

PURPOSE:To reduce the number of capacitors, by providing first-fourth change-over switches, and by outputting positive and negative voltages from the capacitor which has completed its charging. CONSTITUTION:Respective common terminals (c) of first and second change-over switches 1, 2 are connected respectively with the sides of respective first change-over terminals (a), and a capacitor C1 is charged. Then, the respective common terminals (c) of the first and second change-over switches 1, 2 are connected respectively with the sides of respective second change-over terminals (b), and respective terminals (c) of third and fourth change-over switches 3, 4 are connected respectively with the sides of the respective first change-over terminals (a), and thereby, a positive voltage is outputted from the side of the positive electrode of the capacitor C1 to a positive output voltage terminal 7. Also, the respective common terminals (c) of the third and fourth change-over switches 3, 4 are connected respectively with the sides of the respective change-over terminals (b), and thereby, a negative voltage is outputted from the side of the negative electrode of the capacitor C1 to a negative output voltage terminal 6. Therefore, the one capacitor C1 can be used in common between the generations of both the positive and negative voltages. Thereby, the number of capacitors can be reduced.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】この発明は電圧変換装置に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voltage converter.

【０００２】[0002]

【従来の技術】近年、電圧変換装置はビデオカメラなど
の民生用機器の電源として用いられている。以下に、従
来の電圧変換装置について説明する。図３は従来の電圧
変換装置の構成を示す回路図である。図３において、１
０，２０，３０および４０はアナログスイッチであり、
ａは各アナログスイッチ１０，２０，３０，４０の第１
切換え端子、ｂは各アナログスイッチ１０，２０，３
０，４０の第２切換え端子、ｃは各アナログスイッチ１
０，２０，３０，４０の共通端子、５は入力電圧端子、
６は正出力電圧端子、７は負出力電圧端子、８０はアナ
ログスイッチ１０，２０，３０および４０を切り替える
パルス入力（以下、「アナログスイッチ切り替えパル
ス」と称す。）、Ｃ１０，Ｃ２０は電圧充電用コンデン
サ、Ｃ３，Ｃ４は出力電圧安定化用コンデンサである。2. Description of the Related Art In recent years, voltage converters have been used as power sources for consumer equipment such as video cameras. The conventional voltage converter will be described below. FIG. 3 is a circuit diagram showing the configuration of a conventional voltage converter. In FIG. 3, 1
0, 20, 30 and 40 are analog switches,
a is the first of the analog switches 10, 20, 30, 40
Switching terminal, b is each analog switch 10, 20, 3
0, 40 second switching terminal, c is each analog switch 1
0, 20, 30, 40 common terminal, 5 is an input voltage terminal,
6 is a positive output voltage terminal, 7 is a negative output voltage terminal, 80 is a pulse input for switching the analog switches 10, 20, 30 and 40 (hereinafter referred to as "analog switch switching pulse"), and C10 and C20 are for voltage charging. The capacitors C3 and C4 are capacitors for stabilizing the output voltage.

【０００３】図３に示すように、電圧充電用コンデンサ
Ｃ１０は、正電極側をアナログスイッチ１０の共通端子
ｃに接続し、負電極側をアナログスイッチ２０の共通端
子ｃに接続してある。同様に、電圧充電用コンデンサＣ
２０は、正電極側をアナログスイッチ３０の共通端子ｃ
に接続し、負電極側をアナログスイッチ４０の共通端子
ｃに接続してある。アナログスイッチ切り替えパルス８
０がＨＩＧＨレベルの時、アナログスイッチ１０，３０
の共通端子ｃは入力電圧端子５につながり、アナログス
イッチ２０，４０の共通端子ｃはグランドにつながる。
また、アナログスイッチ切り替えパルス８０がＬＯＷレ
ベルの時、アナログスイッチ１０の共通端子ｃは正出力
電圧端子６につながり、アナログスイッチ２０の共通端
子ｃは入力電圧端子５につながり、アナログスイッチ３
０の共通端子ｃはグランドにつながり、アナログスイッ
チ４０の共通端子ｃは負出力電圧端子７につながるよう
に配線されている。As shown in FIG. 3, the voltage charging capacitor C10 has its positive electrode side connected to the common terminal c of the analog switch 10 and its negative electrode side connected to the common terminal c of the analog switch 20. Similarly, the voltage charging capacitor C
20 is a common terminal c of the analog switch 30 on the positive electrode side.
, And the negative electrode side is connected to the common terminal c of the analog switch 40. Analog switch switching pulse 8
When 0 is HIGH level, analog switch 10, 30
The common terminal c of is connected to the input voltage terminal 5, and the common terminal c of the analog switches 20 and 40 is connected to the ground.
Further, when the analog switch switching pulse 80 is LOW level, the common terminal c of the analog switch 10 is connected to the positive output voltage terminal 6, the common terminal c of the analog switch 20 is connected to the input voltage terminal 5, and the analog switch 3 is connected.
The common terminal c of 0 is connected to the ground, and the common terminal c of the analog switch 40 is connected to the negative output voltage terminal 7.

【０００４】以下、このように構成された従来の電圧変
換装置について、その動作を説明する。なお、入力電圧
端子５が＋５〔Ｖ〕電源に接続され、アナログスイッチ
切り替えパルス８０としてＤｕｔｙ５０〔％〕のパルス
が入力され、正出力電圧端子６から＋１０〔Ｖ〕が出力
され、負出力電圧端子７から−５〔Ｖ〕が出力される場
合について説明する。The operation of the conventional voltage conversion device thus configured will be described below. The input voltage terminal 5 is connected to a +5 [V] power supply, a pulse of Duty 50 [%] is input as an analog switch switching pulse 80, +10 [V] is output from the positive output voltage terminal 6, and a negative output voltage terminal is output. A case where 7 to -5 [V] is output will be described.

【０００５】まず、アナログスイッチ切り替えパルス８
０としてＨＩＧＨレベルが入力されている時は、アナロ
グスイッチ１０，３０の共通端子ｃは入力電圧端子５に
つながり、アナログスイッチ２０，４０の共通端子ｃは
グランドにつながる。したがって、電圧充電用コンデン
サＣ１０，Ｃ２０はグランドに対して＋５〔Ｖ〕に充電
される。First, the analog switch switching pulse 8
When the HIGH level is input as 0, the common terminal c of the analog switches 10 and 30 is connected to the input voltage terminal 5, and the common terminal c of the analog switches 20 and 40 is connected to the ground. Therefore, the voltage charging capacitors C10 and C20 are charged to +5 [V] with respect to the ground.

【０００６】次に、アナログスイッチ切り替えパルス８
０としてＬＯＷレベルが入力されている時は、アナログ
スイッチ１０の共通端子ｃは正出力電圧端子６につなが
り、アナログスイッチ２０の共通端子ｃは入力電圧端子
５につながる。このとき、電圧充電用コンデンサＣ１０
は、＋５〔Ｖ〕を基準として＋５Ｖに充電されているこ
ととなり、したがって、グランドから見れば正出力電圧
端子６に＋１０〔Ｖ〕の電圧が出力される。また、同時
に、アナログスイッチ３０の共通端子ｃはグランドにつ
ながり、アナログスイッチ４０の共通端子ｃは負出力電
圧端子７につながる。このとき、電圧充電用コンデンサ
Ｃ２０の共通端子ｃはグランドを基準として−５〔Ｖ〕
に充電されていることとなり、したがって、グランドか
ら見れば負出力電圧端子７に−５〔Ｖ〕の電圧が出力さ
れる。Next, the analog switch switching pulse 8
When the LOW level is input as 0, the common terminal c of the analog switch 10 is connected to the positive output voltage terminal 6, and the common terminal c of the analog switch 20 is connected to the input voltage terminal 5. At this time, the voltage charging capacitor C10
Is charged to +5 V with reference to +5 [V], and therefore a voltage of +10 [V] is output to the positive output voltage terminal 6 when viewed from the ground. At the same time, the common terminal c of the analog switch 30 is connected to the ground, and the common terminal c of the analog switch 40 is connected to the negative output voltage terminal 7. At this time, the common terminal c of the voltage charging capacitor C20 is -5 [V] with respect to the ground.
Therefore, when viewed from the ground, a voltage of -5 [V] is output to the negative output voltage terminal 7.

【０００７】[0007]

【発明が解決しようとする課題】しかしながら、このよ
うに構成された従来の電圧変換装置では、正負電圧発生
のために各１個ずつ計２個の電圧充電用コンデンサＣ１
０，Ｃ２０が必要となり、さらに、出力電圧安定化用コ
ンデンサＣ３，Ｃ４を用いるので、計４個の外付けコン
デンサが必要であるという問題があった。However, in the conventional voltage conversion device having such a configuration, two voltage charging capacitors C1 each are provided to generate positive and negative voltages.
Since 0 and C20 are required and the output voltage stabilizing capacitors C3 and C4 are used, there is a problem that a total of four external capacitors are required.

【０００８】この発明の目的は、上記従来の問題点を解
決するもので必要なコンデンサの数を削減した電圧変換
装置を提供することである。An object of the present invention is to solve the above-mentioned conventional problems and to provide a voltage converter in which the number of required capacitors is reduced.

【０００９】[0009]

【課題を解決するための手段】この発明の電圧変換装置
は、入力電圧端子に第１切換え端子を接続した第１の切
換えスイッチと、この第１の切換えスイッチの共通端子
に正電極側を接続したコンデンサと、このコンデンサの
負電極側に共通端子を接続し第１切換え端子を接地した
第２の切換えスイッチと、この第２の切換えスイッチの
第２切換え端子に共通端子を接続し入力電圧端子に第１
切換え端子を接続し負出力電圧端子に第２切換え端子を
接続した第３の切換えスイッチと、第１の切換えスイッ
チの第２切換え端子に共通端子を接続し正出力電圧端子
に第１切換え端子を接続し第２切換え端子を接地した第
４の切換えスイッチとを備えたものである。In the voltage converter of the present invention, a first changeover switch in which a first changeover terminal is connected to an input voltage terminal and a positive electrode side is connected to a common terminal of the first changeover switch. Connected to the negative terminal side of the capacitor, a second change-over switch having the first change-over terminal grounded, and a common terminal connected to the second change-over terminal of the second change-over switch First
A third changeover switch having a changeover terminal connected thereto and a second changeover terminal connected to the negative output voltage terminal, a common terminal connected to the second changeover terminal of the first changeover switch, and a first changeover terminal connected to the positive output voltage terminal. And a fourth changeover switch which is connected and whose second changeover terminal is grounded.

【００１０】[0010]

【作用】この発明の構成によれば、第１および第２の切
換えスイッチの各共通端子を各第１切換え端子側に接続
することによりコンデンサを充電した後、第１および第
２の切換えスイッチの各共通端子を各第２切換え端子側
に接続し、第３および第４の切換えスイッチの各共通端
子を各第１切換え端子側に接続することによりコンデン
サの正電極側から正出力電圧端子に正電圧を出力させ、
また、第３および第４の切換えスイッチの各共通端子を
各第２切換え端子側に接続することによりコンデンサの
負電極側から負出力電圧端子に負電圧を出力させること
ができる。したがって、１個のコンデンサを正負両電圧
の発生に共用することができる。According to the structure of the present invention, the common terminals of the first and second changeover switches are connected to the first changeover terminal side to charge the capacitors, and then the first and second changeover switches are connected. By connecting each common terminal to each second switching terminal side and connecting each common terminal of the third and fourth switching switches to each first switching terminal side, the positive electrode side of the capacitor is positively connected to the positive output voltage terminal. Output voltage,
Also, by connecting each common terminal of the third and fourth changeover switches to each second changeover terminal side, a negative voltage can be output from the negative electrode side of the capacitor to the negative output voltage terminal. Therefore, one capacitor can be shared to generate both positive and negative voltages.

【００１１】[0011]

【実施例】以下、この発明の一実施例について、図面を
参照しながら説明する。図１はこの発明の一実施例の電
圧変換装置の構成を示す回路図である。図１において、
１は第１の切換えスイッチとなるアナログスイッチ、２
は第２の切換えスイッチとなるアナログスイッチ、３は
第３の切換えスイッチとなるアナログスイッチ、４は第
４の切換えスイッチとなるアナログスイッチであり、ａ
は各アナログスイッチ１，２，３，４の第１切換え端
子、ｂは各アナログスイッチ１，２，３，４の第２切換
え端子、ｃは各アナログスイッチ１，２，３，４の共通
端子である。また、５は入力電圧端子、６は負出力電圧
端子、７は正出力電圧端子、８はアナログスイッチ１，
２を切換える第１の制御パルス、９はアナログスイッチ
３，４を切換える第２の制御パルス、Ｃ１は電圧充電用
コンデンサ、Ｃ２，Ｃ３は出力電圧安定化用コンデンサ
である。第１の制御パルス８は第２の制御パルス９を２
分周したパルスである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing the configuration of a voltage converter according to an embodiment of the present invention. In FIG.
1 is an analog switch that serves as a first changeover switch, 2
Is an analog switch which is a second changeover switch, 3 is an analog switch which is a third changeover switch, 4 is an analog switch which is a fourth changeover switch, and a
Is a first switching terminal of each analog switch 1, 2, 3, 4; b is a second switching terminal of each analog switch 1, 2, 3, 4; c is a common terminal of each analog switch 1, 2, 3, 4 Is. Further, 5 is an input voltage terminal, 6 is a negative output voltage terminal, 7 is a positive output voltage terminal, 8 is an analog switch 1,
2 is a first control pulse for switching 2, 9 is a second control pulse for switching the analog switches 3 and 4, C1 is a voltage charging capacitor, and C2 and C3 are output voltage stabilizing capacitors. The first control pulse 8 is equal to the second control pulse 9
The divided pulse.

【００１２】図１に示すように、電圧変換装置は、入力
電圧端子５に第１切換え端子ａを接続したアナログスイ
ッチ１と、このアナログスイッチ１の共通端子ｃに正電
極側を接続した電圧充電用コンデンサＣ１と、この電圧
充電用コンデンサＣ１の負電極側に共通端子ｃを接続し
第１切換え端子ａを接地したアナログスイッチ２と、こ
のアナログスイッチ２の第２切換え端子ｂに共通端子ｃ
を接続し入力電圧端子５に第１切換え端子ａを接続し負
出力電圧端子６に第２切換え端子ｂを接続したアナログ
スイッチ３と、アナログスイッチ１の第２切換え端子ｂ
に共通端子を接続し正出力電圧端子７に第１切換え端子
ａを接続し第２切換え端子ｂを接地したアナログスイッ
チ４とを備えたものである。そして、正出力電圧端子７
および接地間に出力電圧安定化用コンデンサＣ２を接続
し、負出力電圧端子６および接地間に出力電圧安定化用
コンデンサＣ３を接続したものである。As shown in FIG. 1, the voltage converter has an analog switch 1 in which a first switching terminal a is connected to an input voltage terminal 5 and a voltage charging in which a positive electrode side is connected to a common terminal c of the analog switch 1. Capacitor C1, an analog switch 2 in which the common terminal c is connected to the negative electrode side of the voltage charging capacitor C1 and the first switching terminal a is grounded, and the common terminal c is connected to the second switching terminal b of the analog switch 2.
, The analog switch 3 having the first switching terminal a connected to the input voltage terminal 5 and the second switching terminal b connected to the negative output voltage terminal 6, and the second switching terminal b of the analog switch 1.
An analog switch 4 having a common terminal connected thereto, a positive output voltage terminal 7 connected to a first switching terminal a, and a second switching terminal b grounded. And the positive output voltage terminal 7
And a capacitor C2 for stabilizing the output voltage is connected between the ground and the ground, and a capacitor C3 for stabilizing the output voltage is connected between the negative output voltage terminal 6 and the ground.

【００１３】第１の制御パルス８がＨＩＧＨレベルの
時、アナログスイッチ１の共通端子ｃは入力電圧端子５
につながり、アナログスイッチ２の共通端子ｃはグラン
ドにつながる。また、第１の制御パルス８がＬＯＷレベ
ルの時、アナログスイッチ１のの共通端子ｃはアナログ
スイッチ４の共通端子ｃにつながり、アナログスイッチ
２の共通端子ｃはアナログスイッチ３の共通端子ｃにつ
ながる。When the first control pulse 8 is HIGH level, the common terminal c of the analog switch 1 is the input voltage terminal 5
, And the common terminal c of the analog switch 2 is connected to the ground. Further, when the first control pulse 8 is at the LOW level, the common terminal c of the analog switch 1 is connected to the common terminal c of the analog switch 4, and the common terminal c of the analog switch 2 is connected to the common terminal c of the analog switch 3. ..

【００１４】また、第２の制御パルス９がＨＩＧＨレベ
ルの時、アナログスイッチ３の共通端子ｃは入力電圧端
子５につながり、アナログスイッチ４の共通端子ｃは正
出力電圧端子７につながり、また、第２の制御パルス９
がＬＯＷレベルの時、アナログスイッチ３の共通端子ｃ
は負出力電圧端子６につながり、アナログスイッチ４の
共通端子ｃはグランドにつながる。Further, when the second control pulse 9 is at the high level, the common terminal c of the analog switch 3 is connected to the input voltage terminal 5, the common terminal c of the analog switch 4 is connected to the positive output voltage terminal 7, and Second control pulse 9
Is low level, common terminal c of analog switch 3
Is connected to the negative output voltage terminal 6, and the common terminal c of the analog switch 4 is connected to the ground.

【００１５】次に、このように構成した電圧変換回路の
動作を図２を参照しながら説明する。なお、図２(a) は
第１および第２の制御パルス８，９の入力波形図、図２
(b)は第１および第２の制御パルス８，９の各期間Ａ，
Ｂ，Ｃ，Ｄにおけるアナログスイッチ１，２，３，４の
接続状態を示す図であり、図１と同符号の部分は同様の
部分を示す。Next, the operation of the voltage conversion circuit thus configured will be described with reference to FIG. 2 (a) is an input waveform diagram of the first and second control pulses 8 and 9, and FIG.
(b) shows each period A of the first and second control pulses 8 and 9,
It is a figure which shows the connection state of the analog switches 1, 2, 3, and 4 in B, C, and D, and the part of the same code | symbol as FIG. 1 shows the same part.

【００１６】入力電圧端子５に＋５〔Ｖ〕電源を接続
し、第２の制御パルス９としてＤｕｔｙ５０〔％〕のパ
ルスを入力し、第１の制御パルス８として第２の制御パ
ルス９を２分周したパルスを入力する。まず、第１の制
御パルス８および第２の制御パルス９がともにＨＩＧＨ
レベルの期間Ａでは、アナログスイッチ１，３の共通端
子ｃは入力電圧端子５につながり、アナログスイッチ２
の共通端子ｃはグランドにつながり、アナログスイッチ
４の共通端子ｃは正出力電圧端子７につながっている。
これにより、電圧充電用コンデンサＣ１はグランドに対
して＋５〔Ｖ〕に充電される。A +5 [V] power supply is connected to the input voltage terminal 5, a duty 50 [%] pulse is input as the second control pulse 9, and the second control pulse 9 is divided into 2 minutes as the first control pulse 8. Input the lapped pulse. First, both the first control pulse 8 and the second control pulse 9 are HIGH.
In the level period A, the common terminal c of the analog switches 1 and 3 is connected to the input voltage terminal 5, and the analog switch 2
Of the analog switch 4 is connected to the ground, and the common terminal c of the analog switch 4 is connected to the positive output voltage terminal 7.
As a result, the voltage charging capacitor C1 is charged to +5 [V] with respect to the ground.

【００１７】次に、第１の制御パルス８がＨＩＧＨレベ
ルであり、第２の制御パルス９がＬＯＷレベルである期
間Ｂでは、アナログスイッチ１，２は期間Ａと同様にア
ナログスイッチ１は入力電圧端子５につながり、アナロ
グスイッチ２はグランドにつながる。また、アナログス
イッチ３の共通端子ｃは負出力電圧端子６につながり、
アナログスイッチ４の共通端子ｃはグランドにつなが
る。Next, in the period B in which the first control pulse 8 is at the HIGH level and the second control pulse 9 is at the LOW level, the analog switches 1 and 2 are the same as the period A, and the analog switch 1 is at the input voltage. The analog switch 2 is connected to the terminal 5 and the ground. The common terminal c of the analog switch 3 is connected to the negative output voltage terminal 6,
The common terminal c of the analog switch 4 is connected to the ground.

【００１８】次に、第１の制御パルス８がＬＯＷレベル
であり、第２の制御パルス９がＨＩＧＨレベルである期
間Ｃでは、アナログスイッチ１の共通端子ｃはアナログ
スイッチ４の共通端子ｃにつながり、アナログスイッチ
２の共通端子ｃはアナログスイッチ３の共通端子ｃにつ
ながり、アナログスイッチ３の共通端子ｃは入力電圧端
子５につながり、アナログスイッチ４の共通端子ｃは正
出力電圧端子７につながる。このとき、電圧充電用コン
デンサＣ１は＋５〔Ｖ〕を基準として＋５〔Ｖ〕に充電
されていることとなり、したがって、グランドからみれ
ば正出力電圧端子７に＋１０〔Ｖ〕の電圧が出力する。Next, during the period C in which the first control pulse 8 is at the LOW level and the second control pulse 9 is at the HIGH level, the common terminal c of the analog switch 1 is connected to the common terminal c of the analog switch 4. , The common terminal c of the analog switch 2 is connected to the common terminal c of the analog switch 3, the common terminal c of the analog switch 3 is connected to the input voltage terminal 5, and the common terminal c of the analog switch 4 is connected to the positive output voltage terminal 7. At this time, the voltage charging capacitor C1 is charged to +5 [V] with reference to +5 [V]. Therefore, when viewed from the ground, a voltage of +10 [V] is output to the positive output voltage terminal 7.

【００１９】そして、第１の制御パルス８および第２の
制御パルス９がともにＬＯＷレベルの期間Ｄでは、アナ
ログスイッチ１，２は期間Ｃと同様にアナログスイッチ
１はアナログスイッチ３につながり、アナログスイッチ
２はアナログスイッチ４につながる。また、アナログス
イッチ３の共通端子ｃは負出力電圧端子６につながり、
アナログスイッチ４の共通端子ｃはグランドにつなが
る。このとき、電圧充電用コンデンサＣ１はグランドを
基準として−５〔Ｖ〕に充電されていることとなり、し
たがって、グランドから見れば負出力電圧端子６に−５
〔Ｖ〕の電圧が出力する。In the period D in which both the first control pulse 8 and the second control pulse 9 are LOW level, the analog switches 1 and 2 are connected to the analog switch 3 in the same manner as in the period C in the analog switches 1 and 2, and the analog switch 3 is connected. 2 is connected to the analog switch 4. The common terminal c of the analog switch 3 is connected to the negative output voltage terminal 6,
The common terminal c of the analog switch 4 is connected to the ground. At this time, the voltage charging capacitor C1 is charged to -5 [V] with respect to the ground, and therefore, when viewed from the ground, the negative output voltage terminal 6 has a voltage of -5.
The voltage of [V] is output.

【００２０】上述、期間Ａから期間Ｄまでの動作を繰り
返すことにより、＋５〔Ｖ〕の入力電圧から＋１０
〔Ｖ〕および−５〔Ｖ〕の変換電圧が得られる。このよ
うに、アナログスイッチ１，２の各共通端子ｃを各第１
切換え端子ａに接続することにより電圧充電用コンデン
サＣ１を充電した後（Ａ期間およびＢ期間）、アナログ
スイッチ１，２の各共通端子ｃを各第２切換え端子ｂに
接続し、アナログスイッチ３，４の各共通端子ｃを各第
１切換え端子ａに接続することにより電圧充電用コンデ
ンサＣ１の正電極側から正出力電圧端子７に正電圧を出
力させ（Ｃ期間）、また、アナログスイッチ３，４の各
共通端子ｃを各第２切換え端子ｂに接続することにより
電圧充電用コンデンサＣ１の負電極側から負出力電圧端
子６に負電圧を出力させることができる（Ｄ期間）。し
たがって、１個の電圧充電用コンデンサＣ１を正負両電
圧の発生に共用することができる。By repeating the operation from the period A to the period D, the input voltage of +5 [V] is changed to +10.
Converted voltages of [V] and -5 [V] are obtained. In this way, the common terminals c of the analog switches 1 and 2 are connected to the first
After charging the voltage charging capacitor C1 by connecting it to the switching terminal a (A period and B period), each common terminal c of the analog switches 1 and 2 is connected to each second switching terminal b, and the analog switch 3, By connecting each common terminal c of 4 to each first switching terminal a, a positive voltage is output from the positive electrode side of the voltage charging capacitor C1 to the positive output voltage terminal 7 (C period), and the analog switch 3, By connecting each common terminal c of 4 to each second switching terminal b, a negative voltage can be output from the negative electrode side of the voltage charging capacitor C1 to the negative output voltage terminal 6 (D period). Therefore, one voltage charging capacitor C1 can be shared to generate both positive and negative voltages.

【００２１】その結果、従来と比較してコンデンサの数
を削減した電圧変換装置を実現することができる。な
お、この実施例では＋５〔Ｖ〕の入力電圧から＋１０
〔Ｖ〕および−５〔Ｖ〕の変換電圧を発生させる場合に
ついて説明したが、コンデンサの容量と入力電圧を変え
ることにより、任意の出力電圧を得ることができる。ま
た、この実施例では第２の制御パルスとしてＤｕｔｙ５
０〔％〕のパルスを用いたが、Ｄｕｔｙについては任意
で良い。さらに、この実施例では第１の制御パルス８と
して第２の制御パルス９を２分周したパルスを用いた
が、分周比については任意で良い。As a result, it is possible to realize a voltage conversion device in which the number of capacitors is reduced as compared with the conventional one. In this embodiment, from an input voltage of +5 [V] to +10
The case where the converted voltages of [V] and -5 [V] are generated has been described, but an arbitrary output voltage can be obtained by changing the capacitance of the capacitor and the input voltage. Further, in this embodiment, Duty5 is used as the second control pulse.
A pulse of 0% was used, but the duty may be arbitrary. Further, in this embodiment, a pulse obtained by dividing the second control pulse 9 by two is used as the first control pulse 8, but the division ratio may be arbitrary.

【００２２】[0022]

【発明の効果】この発明の電圧変換装置によれば、第１
および第２の切換えスイッチの各共通端子を各第１切換
え端子側に接続することによりコンデンサを充電した
後、第１および第２の切換えスイッチの各共通端子を各
第２切換え端子側に接続し、第３および第４の切換えス
イッチの各共通端子を各第１切換え端子側に接続するこ
とによりコンデンサの正電極側から正出力電圧端子に正
電圧を出力させ、また、第３および第４の切換えスイッ
チの各共通端子を各第２切換え端子側に接続することに
よりコンデンサの負電極側から負出力電圧端子に負電圧
を出力させることができる。したがって、１個のコンデ
ンサを正負両電圧の発生に共用することができる。According to the voltage converter of the present invention, the first
And charging the capacitors by connecting the respective common terminals of the second changeover switch to the respective first changeover terminal sides, and then connecting the respective common terminals of the first and second changeover switches to the respective second changeover terminal sides. , The common terminals of the third and fourth changeover switches are connected to the respective first changeover terminal sides to output a positive voltage from the positive electrode side of the capacitor to the positive output voltage terminal, and the third and fourth changeover switches are connected. By connecting each common terminal of the changeover switch to each second changeover terminal side, it is possible to output a negative voltage from the negative electrode side of the capacitor to the negative output voltage terminal. Therefore, one capacitor can be shared to generate both positive and negative voltages.

【００２３】その結果、従来と比較してコンデンサの数
を削減した電圧変換装置を実現することができる。As a result, it is possible to realize a voltage conversion device in which the number of capacitors is reduced as compared with the conventional one.

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

【図１】この発明の一実施例の電圧変換装置の構成を示
す回路図である。FIG. 1 is a circuit diagram showing a configuration of a voltage converter according to an embodiment of the present invention.

【図２】同電圧変換装置の動作説明図である。FIG. 2 is an operation explanatory diagram of the voltage conversion device.

【図３】従来の電圧変換装置の構成を示す回路図であ
る。FIG. 3 is a circuit diagram showing a configuration of a conventional voltage conversion device.

【符号の説明】[Explanation of symbols]

１ アナログスイッチ（第１の切換えスイッチ） ２ アナログスイッチ（第２の切換えスイッチ） ３ アナログスイッチ（第３の切換えスイッチ） ４ アナログスイッチ（第４の切換えスイッチ） ５ 入力電圧端子 ６ 負出力電圧端子 ７ 正出力電圧端子 Ｃ１ 電圧充電用コンデンサ（コンデンサ） ａ 第１切換え端子 ｂ 第２切換え端子 ｃ 共通端子 1 analog switch (first changeover switch) 2 analog switch (second changeover switch) 3 analog switch (third changeover switch) 4 analog switch (fourth changeover switch) 5 input voltage terminal 6 negative output voltage terminal 7 Positive output voltage terminal C1 Voltage charging capacitor (capacitor) a First switching terminal b Second switching terminal c Common terminal

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 入力電圧端子に第１切換え端子を接続し
た第１の切換えスイッチと、この第１の切換えスイッチ
の共通端子に正電極側を接続したコンデンサと、このコ
ンデンサの負電極側に共通端子を接続し第１切換え端子
を接地した第２の切換えスイッチと、この第２の切換え
スイッチの第２切換え端子に共通端子を接続し前記入力
電圧端子に第１切換え端子を接続し負出力電圧端子に第
２切換え端子を接続した第３の切換えスイッチと、前記
第１の切換えスイッチの第２切換え端子に共通端子を接
続し正出力電圧端子に第１切換え端子を接続し第２切換
え端子を接地した第４の切換えスイッチとを備えた電圧
変換装置。1. A first changeover switch having a first changeover terminal connected to an input voltage terminal, a capacitor having a positive electrode side connected to a common terminal of the first changeover switch, and a negative electrode side common to the capacitor. A second changeover switch having a terminal connected thereto and the first changeover terminal grounded, and a common terminal connected to the second changeover terminal of the second changeover switch and a first changeover terminal connected to the input voltage terminal to provide a negative output voltage. A third selector switch having a second selector terminal connected to the terminal, a common terminal connected to the second selector terminal of the first selector switch, a first selector terminal connected to the positive output voltage terminal, and a second selector terminal connected to the positive output voltage terminal. A voltage conversion device having a fourth changeover switch grounded.
JP3253480A 1991-10-01 1991-10-01 Voltage converter Pending JPH0595669A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3253480A JPH0595669A (en) 1991-10-01 1991-10-01 Voltage converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3253480A JPH0595669A (en) 1991-10-01 1991-10-01 Voltage converter

Publications (1)

Publication Number Publication Date
JPH0595669A true JPH0595669A (en) 1993-04-16

Family

ID=17251973

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3253480A Pending JPH0595669A (en) 1991-10-01 1991-10-01 Voltage converter

Country Status (1)

Country Link
JP (1) JPH0595669A (en)

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