JPS6127922B2 - - Google Patents
Info
- Publication number
- JPS6127922B2 JPS6127922B2 JP10741576A JP10741576A JPS6127922B2 JP S6127922 B2 JPS6127922 B2 JP S6127922B2 JP 10741576 A JP10741576 A JP 10741576A JP 10741576 A JP10741576 A JP 10741576A JP S6127922 B2 JPS6127922 B2 JP S6127922B2
- Authority
- JP
- Japan
- Prior art keywords
- input
- phase shift
- resistor
- capacitor
- multiplier
- 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
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B27/00—Generation of oscillations providing a plurality of outputs of the same frequency but differing in phase, other than merely two anti-phase outputs
Landscapes
- Ac-Ac Conversion (AREA)
Description
【発明の詳細な説明】
〔発明の属する技術分野〕
本発明は演算増幅器を用いた３相正弦波発生装
置に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a three-phase sine wave generator using an operational amplifier.
第１図はこの種の従来装置を示す。この装置で
は３つの全く同じ構成の移送回路が環状接続され
ている。各移相回路は演算増幅器Ａ、入力抵抗、
負帰還抵抗、積分コンデンサから構成されてい
る。入力抵抗の値をＲ／２、負帰還抵抗の値を
Ｒ、そして積分コンデンサの容量を２Ｃとする
と、各移相回路の周波数伝達関数は
Ｇ（jw）＝２／１＋ｊ（２ｗＣＲ）
と表わすことができ、３つの移相回路から得られ
る３相正弦波電圧の角周波数ωは
となる。
FIG. 1 shows a conventional device of this type. In this device, three identical transfer circuits are connected in a ring. Each phase shift circuit includes an operational amplifier A, an input resistor,
It consists of a negative feedback resistor and an integrating capacitor. If the value of the input resistance is R/2, the value of the negative feedback resistor is R, and the capacity of the integrating capacitor is 2C, the frequency transfer function of each phase shift circuit can be expressed as G (jw) = 2/1 + j (2wCR). The angular frequency ω of the three-phase sinusoidal voltage obtained from the three phase shift circuits is becomes.
従つて、角周波数ωはコンデンサ容量Ｃを変化
させるか、入力抵抗と負帰還抵抗との比を１：２
に保ちながら抵抗Ｒを変化させるかのいずれかに
よつて変化させることができる。しかしながらこ
のようなやり方は一般には困難である。 Therefore, the angular frequency ω changes the capacitance C or changes the ratio of the input resistance to the negative feedback resistance to 1:2.
The resistance R can be changed by either changing the resistance R while keeping the resistance R constant. However, such an approach is generally difficult.
本発明の目的は極めて簡単な付加手段により周
波数指令信号に応じて連続的に周波数を変化でき
るようにした３相弦波発生装置を提供することに
ある。
SUMMARY OF THE INVENTION An object of the present invention is to provide a three-phase sinusoidal wave generator that can continuously change the frequency according to a frequency command signal using extremely simple additional means.
このような目的を達成するために、本発明は、
演算増幅器と入力抵抗と積分コンデンサとからな
る積分器の出力側に掛算器を接続し、前記入力抵
抗の２倍の抵抗値に選定した負帰還抵抗を介して
前記掛算器の出力端を積分器の入力側に帰還結合
してなる同じ移相回路を３個設けて、これらの移
相回路を環状に接続し、かつそれらの移相回路の
うち一つの移相回路の入力側に、抵抗およびコン
デンサから成り直流電源に接続された初期値投入
回路を接続して、各移相回路における掛算器に共
通な係数入力を与えることにより、これらの掛算
器の出力端において前記共通な係数入力に応じて
可変の周波数を持つた３相正弦波電圧を取り出せ
るようにしたことを特徴とする。
In order to achieve such an objective, the present invention
A multiplier is connected to the output side of an integrator consisting of an operational amplifier, an input resistor, and an integrating capacitor, and the output end of the multiplier is connected to the integrator via a negative feedback resistor whose resistance value is twice the input resistance. Three identical phase shift circuits formed by feedback coupling are provided on the input side of the circuit, and these phase shift circuits are connected in a ring, and a resistor and a resistor are connected to the input side of one of the phase shift circuits. By connecting an initial value input circuit consisting of a capacitor and connected to a DC power supply, and giving a common coefficient input to the multipliers in each phase shift circuit, the output terminals of these multipliers can respond to the common coefficient input. It is characterized by being able to extract a three-phase sine wave voltage having a variable frequency.
次に本発明の実施例を図面に基づいて詳細に説
明する。
Next, embodiments of the present invention will be described in detail based on the drawings.
第２図に示す本発明実施例によれば、３つの移
相回路のそれぞれの演算増幅器Ａの出力側に掛算
器Ｍが挿入され、それぞれにおいて負帰還抵抗Ｒ
は掛算器Ｍの外側に接続されている。これらの掛
算器Ｍには共通な係数入力信号が周波数指令用電
圧信号として与えられる。増幅器Ａの出力Ｘに対
して掛算器Ｍの出力をＫ・Ｘを表わすものとする
と各移相回路の周波数伝達関数Ｇ（ｊω）は
と表わせる。この場合にそれぞれ掛算器Ｍの出力
端のところで取り出される互いに120゜ずつ移相
のずれた電圧の角周波数ωは
と表わすことができる。つまり３相正弦波電圧の
周波数が係数入力信号によつて与えられる値Ｋに
よつて連続的に変化可能となる。なお、第１図お
よび第２図に示されている一つの移相回路の入力
側に接続されている直流電源Ｖ＋、抵抗ｒ、コン
デンサC0は初期値投入のための回路である。ま
た第２図に破線で接続が示されているように抵抗
R0により若干の正帰還をかけることは、発振振
幅の減衰を防ぐのに効果的である。 According to the embodiment of the invention shown in FIG. 2, a multiplier M is inserted on the output side of each operational amplifier A of the three phase shift circuits, and a negative feedback resistor R
is connected outside the multiplier M. A common coefficient input signal is given to these multipliers M as a frequency command voltage signal. If the output of the multiplier M is expressed as K×X for the output X of the amplifier A, the frequency transfer function G(jω) of each phase shift circuit is It can be expressed as In this case, the angular frequency ω of the voltages taken out at the outputs of the multipliers M with a phase shift of 120° from each other is It can be expressed as In other words, the frequency of the three-phase sinusoidal voltage can be changed continuously by the value K given by the coefficient input signal. Note that the DC power supply V+, resistor r, and capacitor C0 connected to the input side of one phase shift circuit shown in FIGS. 1 and 2 are circuits for inputting initial values. In addition, as shown in Figure 2 by the dashed line, the resistor
Applying some positive feedback to R 0 is effective in preventing attenuation of the oscillation amplitude.
以上に説明したように、本発明によれば、簡単
な付加手段により、３相正弦波電圧の周波数が係
数入力信号によつて与えられる値に応じて連続的
に変化可能となる。
As explained above, according to the present invention, the frequency of the three-phase sinusoidal voltage can be changed continuously according to the value given by the coefficient input signal by a simple addition means.
第１図は従来の実施例を示す回路図、第２図は
本発明の実施例を示す回路図。
Ａ……演算増幅器、Ｒ／２……入力抵抗値、Ｒ
……負帰還抵抗値、２Ｃ……コンデンサ容量、Ｍ
……掛算器。
FIG. 1 is a circuit diagram showing a conventional embodiment, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. A...Operation amplifier, R/2...Input resistance value, R
...Negative feedback resistance value, 2C...Capacitor capacity, M
...Multiplier.
Claims (1)
らなる積分器の出力側に掛算器を接続し、前記入
力抵抗の２倍の抵抗値に選定した負帰還抵抗を介
して前記掛算器の出力端を積分器の入力側に帰還
結合してなる同じ移相回路を３個設けて、これら
の移相回路を環状に接続し、かつそれらの移相回
路のうち一つの移相回路の入力側に、抵抗および
コンデンサから成り直流電源に接続された初期値
投入回路を接続して、各移相回路における掛算器
に共通な係数入力を与えることにより、これらの
掛算器の出力端において前記共通な係数入力に応
じて可変の周波数を持つた３相正弦波電圧を取り
出せるようにしたことを特徴とする３相正弦波発
生装置。1. A multiplier is connected to the output side of an integrator consisting of an operational amplifier, an input resistor, and an integrating capacitor, and the output end of the multiplier is integrated via a negative feedback resistor selected to have a resistance value twice that of the input resistor. Three identical phase shift circuits formed by feedback coupling are provided on the input side of the device, and these phase shift circuits are connected in a ring, and a resistor is connected to the input side of one of the phase shift circuits. By connecting an initial value input circuit consisting of a capacitor and a capacitor and connected to a DC power supply, and giving a common coefficient input to the multipliers in each phase shift circuit, the output terminals of these multipliers can be connected to the common coefficient input. A three-phase sine wave generator characterized in that a three-phase sine wave voltage having a variable frequency can be extracted according to the frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10741576A JPS5333037A (en) | 1976-09-08 | 1976-09-08 | Three-phase sine wave generating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10741576A JPS5333037A (en) | 1976-09-08 | 1976-09-08 | Three-phase sine wave generating equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5333037A JPS5333037A (en) | 1978-03-28 |
| JPS6127922B2 true JPS6127922B2 (en) | 1986-06-27 |
Family
ID=14458558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10741576A Granted JPS5333037A (en) | 1976-09-08 | 1976-09-08 | Three-phase sine wave generating equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5333037A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03122243U (en) * | 1990-03-27 | 1991-12-13 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55142014U (en) * | 1979-03-31 | 1980-10-11 | ||
| US4459566A (en) * | 1982-05-28 | 1984-07-10 | General Electric Company | Voltage controlled oscillator using a voltage tunable filter with feedback |
-
1976
- 1976-09-08 JP JP10741576A patent/JPS5333037A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03122243U (en) * | 1990-03-27 | 1991-12-13 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5333037A (en) | 1978-03-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3978420A (en) | Self-tuning filter | |
| Chang et al. | Realization of current-mode transfer function using second-generation current conveyors | |
| JPS58133004A (en) | Amplitude detector | |
| JPH0414526B2 (en) | ||
| Shah et al. | Current-mode active-only universal filter | |
| JPS6127922B2 (en) | ||
| US4227095A (en) | Deviation driver circuit | |
| US4459566A (en) | Voltage controlled oscillator using a voltage tunable filter with feedback | |
| SE426124B (en) | INTEGRATED IMPEDANCE CONVERSION CIRCUIT IN HYBRID EXTENSION | |
| JPH0158893B2 (en) | ||
| US4136289A (en) | Phase control circuit and oscillator circuit using it | |
| US3558925A (en) | Low ripple double demodulator subject to integration | |
| Rao et al. | Active RC Synthesis of Driving Impedances, Generalized Impedance Inverters/Converters, Oscillators and Filters | |
| JPS6218089B2 (en) | ||
| US2846643A (en) | Compensated electrical integrator | |
| US3479618A (en) | Resistively terminated single tee and pi one port network having a prescribed positive real bi-order-n immittance and utilizing a negative immittance | |
| SU598216A1 (en) | Active rc-filter | |
| JPH0522969Y2 (en) | ||
| Neelakantan | Design of active filters using double layer rc distributed lines | |
| SU815868A2 (en) | Broad-band active rc-filter | |
| SU623251A1 (en) | Arrangement for reactive input resistance | |
| JPS6033619Y2 (en) | Secondary state variable circuit | |
| JPH0614506Y2 (en) | Active filter circuit | |
| 洪君維 et al. | Two CFAs Based Four Inputs Voltage-Mode Universal Biquadratic Filter | |
| SU1149387A1 (en) | Phase inverter |