JPS6019686B2 - PWM modulation method - Google Patents
PWM modulation methodInfo
- Publication number
- JPS6019686B2 JPS6019686B2 JP7576877A JP7576877A JPS6019686B2 JP S6019686 B2 JPS6019686 B2 JP S6019686B2 JP 7576877 A JP7576877 A JP 7576877A JP 7576877 A JP7576877 A JP 7576877A JP S6019686 B2 JPS6019686 B2 JP S6019686B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- pwm modulation
- triangular wave
- wave signal
- modulation method
- 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
Landscapes
- Amplifiers (AREA)
- Inverter Devices (AREA)
- Analogue/Digital Conversion (AREA)
Description
【発明の詳細な説明】
本発明はＰＷＭ（ｐ山ｓｅＭｄｔｈｍｏｄ山ａｔｉｏｎ
）変調において、過大入力信号によって生じるＰＷＭ変
調信号のキャリアの欠除を防ぐことを目的とするもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention provides PWM (PWM)
) In modulation, the purpose is to prevent carrier deletion of a PWM modulated signal caused by an excessive input signal.
ＰＷＭ変調を行なう場合、一般的によく知られている方
式として、三角波信号あるいは鏡歯状波信号を用いて入
力信号と比較をすることによりＰＷＭ変調信号を得る方
式がある。When performing PWM modulation, a generally well-known method is to obtain a PWM modulated signal by using a triangular wave signal or a mirror-tooth wave signal and comparing it with an input signal.
ここで三角波信号を用いた代表的な例を第１図の波形図
により説明する。ある一定の繰返し周波数をもつ三角波
信号ａを作り、この三角波信号ａと入力信号ｂとで電圧
比較を行なうと、同図ｂに示す信号ｃが得られる。この
信号ｃは入力信号ｂの振中に比例してパル中が変化する
もので、ＰＷＭ変調信号である。しかしこのように三角
波信号ａと入力信号ｂを比較する方式では第２図イに示
すように入力信号ｄが三角波信号ｅよりも大きくなった
場合には、同図口に示すように信号ｆのようになり、キ
ャリアが欠除したＰＷＭ変調信号となってしまう。Here, a typical example using a triangular wave signal will be explained with reference to the waveform diagram of FIG. When a triangular wave signal a having a certain repetition frequency is created and a voltage comparison is made between this triangular wave signal a and an input signal b, a signal c shown in b in the figure is obtained. This signal c has a pulse that changes in proportion to the oscillation of the input signal b, and is a PWM modulated signal. However, in this method of comparing the triangular wave signal a and the input signal b, if the input signal d becomes larger than the triangular wave signal e as shown in Figure 2A, the signal f will be This results in a PWM modulated signal without a carrier.
したがってこの信号を復調すると、出力がなくなったり
、また雑音の原因となったりする。この欠点′をなくす
ためには入力信号を三角波信号より大きくならないよう
に入力側で制御するか、ＰＷＭ変調信号に何らかの方法
でキャリアを付加すればよい。本発明は電圧比較を行な
いＰＷＭ変調信号を得た後に、ディジタル信号処理を行
なうことにより、キャリアを付加し、過大入力に対する
キャリアの欠除を防ぐ方式を提供するもので、以下図面
を用いてその一実施例を説明する。Therefore, if this signal is demodulated, there will be no output or it will cause noise. In order to eliminate this drawback, the input signal may be controlled on the input side so that it does not become larger than the triangular wave signal, or a carrier may be added to the PWM modulation signal by some method. The present invention provides a method of adding a carrier by performing digital signal processing after obtaining a PWM modulated signal by performing voltage comparison, and thereby preventing carrier deletion due to excessive input. An example will be described.
第３図において１は基本クロック信号を発生する発生回
路、２はそのクロック信号に同期した三角波信号を発生
する三角波発生回路、３，４はそれぞれクロック信号の
立上り部、立下り部でＰＷＭ変調時における最大変調さ
れた信号よりもパルス中の狭いパルスを発生する単安定
マルチバイブレータである。In Fig. 3, 1 is a generation circuit that generates a basic clock signal, 2 is a triangular wave generation circuit that generates a triangular wave signal synchronized with the clock signal, and 3 and 4 are the rising and falling portions of the clock signal, respectively, during PWM modulation. is a monostable multivibrator that generates narrower pulses within a pulse than the maximum modulated signal at.
５は入力端子６に加わる入力信号と三角波信号の比較を
行なうコンパレータ、７はＯＲ回路、８はＡＮＤ回路で
ある。5 is a comparator for comparing the input signal applied to the input terminal 6 and the triangular wave signal, 7 is an OR circuit, and 8 is an AND circuit.
９は出力端子である。9 is an output terminal.
第４図においてイは発生回路１の発生するクロック信号
ｇ、口，ハはそれぞれ単安定マルチパイプレータ３，４
の出力信号ｈ，ｉ、二は端子６に加わる入力信号ｉおよ
び発生回路２の発生する信号ｋを示す。In FIG. 4, A is the clock signal g generated by the generating circuit 1, and C and A are the monostable multipipulators 3 and 4, respectively.
The output signals h, i, 2 represent the input signal i applied to the terminal 6 and the signal k generated by the generating circuit 2.
木はコンパレータ５の出力信号１、へはＯＲ回路７の出
力信号ｍ、トはＡＮＤ回路８の出力信号ｎを示す。次に
動作を説明する。The tree indicates the output signal 1 of the comparator 5, the symbol "g" indicates the output signal m of the OR circuit 7, and the symbol "g" indicates the output signal n of the AND circuit 8. Next, the operation will be explained.
入力端子６に加わった信号ｉが第４図ニに示すように、
三角波信号ｋよりも大きな信号の場合、コンパレー夕５
の出力信号は第４図木に示すようにキャリアのないＰＷ
Ｍ変調信号となる。しかしＯＲ回路７によりＰＷＭ変調
信号１と単安定マルチパイプレータ３の出力信号ｈとを
加算すると第４図へに示す信号波形となる。即ち入力信
号ｋが三角波信号ｋよりも十側に大きくなりキャリアが
欠除した部分のキャリアを付加することができる。そし
てこの信号ｍと単安定マルチパイプレータ４の出力信号
ｉとをＡＮＤ回路８でかけ合すと第４図卜に示す信号波
形となり、入力信号ｉが三角波信号ｋよりも−側に大き
くなってキャリアが欠除した部分のキャリアが付加され
、ＰＷＭ変調信号が得られる。しかもキャリアのある部
分には何ら影響を与えない。なお上記実施例では入力信
号との比較信号として三角波信号を用いたが、銀歯状波
信号を用いても同様である。As shown in FIG. 4D, the signal i applied to the input terminal 6 is
If the signal is larger than the triangular wave signal k, the comparator 5
The output signal is PW without a carrier as shown in the tree in Figure 4.
It becomes an M modulation signal. However, when the PWM modulation signal 1 and the output signal h of the monostable multipipulator 3 are added by the OR circuit 7, the signal waveform shown in FIG. 4 is obtained. In other words, it is possible to add a carrier to a portion where the input signal k is larger than the triangular wave signal k and the carrier is deleted. When this signal m and the output signal i of the monostable multipipulator 4 are multiplied by the AND circuit 8, the signal waveform shown in FIG. A carrier corresponding to the deleted portion is added to obtain a PWM modulated signal. Moreover, it does not affect certain aspects of your career in any way. Note that in the above embodiment, a triangular wave signal is used as a comparison signal with the input signal, but the same effect can be achieved even if a silver tooth wave signal is used.
以上のように本発明によれば簡単なディジタル信号処理
により確実にキャリアを付加することができる。As described above, according to the present invention, carriers can be reliably added by simple digital signal processing.
第１図はＰＷＭ変調方式の原理を示す信号波形図、第２
図はＰＷＭ変調方式でキャリアが欠除する場合の信号波
形図、第３図は本発明によるＰＷＭ変調方式を用いた装
置の回路図、第４図は各部の信号波形図である。
２・・・・・・三角波発生回路、３，４・・・・・・単
安定マルチパイプレータ、５……コンパレータ、７……
ＯＲ回路、８・・・・・・ＡＮＤ回路。
第１図
第３図
第２図
第４図Figure 1 is a signal waveform diagram showing the principle of PWM modulation method, Figure 2
The figure is a signal waveform diagram when a carrier is deleted in the PWM modulation method, FIG. 3 is a circuit diagram of a device using the PWM modulation method according to the present invention, and FIG. 4 is a signal waveform diagram of each part. 2... Triangular wave generation circuit, 3, 4... Monostable multipipulator, 5... Comparator, 7...
OR circuit, 8...AND circuit. Figure 1 Figure 3 Figure 2 Figure 4
Claims (1)
較することによりＰＷＭ変調を行なう方式において、過
大入力信号の加わつた時に補償用のパルス信号をＰＷＭ
変調信号に付加し、キヤリアの欠除を防ぐことを特徴と
するＰＷＭ変調方式。 ２ 補償用のパルス信号のパルス中をＰＷＭ最大変調時
の被変調信号よりも細くしたことを特徴とする特許請求
の範囲第１項記載のＰＷＭ変調方式。 ３ 補償用のパルス信号をＰＷＭ変調信号に付加する手
段として三角波信号あるいは鋸歯状波信号に同期したパ
ルス信号を常時発生する手段、そのパルス信号をＰＷＭ
変調信号に常時印加する手段を設けてなる特許請求の範
囲第２項記載のＰＷＭ変調方式。[Claims] 1. In a system that performs PWM modulation by comparing an input signal with a triangular wave signal or a sawtooth wave signal, when an excessive input signal is applied, the compensation pulse signal is
A PWM modulation method that is added to a modulated signal to prevent carrier deletion. 2. The PWM modulation method according to claim 1, wherein the pulse of the compensation pulse signal is made thinner than the modulated signal at the time of maximum PWM modulation. 3 Means for constantly generating a pulse signal synchronized with a triangular wave signal or a sawtooth wave signal as a means for adding a compensation pulse signal to a PWM modulation signal, and a means for constantly generating a pulse signal synchronized with a triangular wave signal or sawtooth wave signal,
3. The PWM modulation method according to claim 2, further comprising means for constantly applying the modulation signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7576877A JPS6019686B2 (en) | 1977-06-24 | 1977-06-24 | PWM modulation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7576877A JPS6019686B2 (en) | 1977-06-24 | 1977-06-24 | PWM modulation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5410653A JPS5410653A (en) | 1979-01-26 |
| JPS6019686B2 true JPS6019686B2 (en) | 1985-05-17 |
Family
ID=13585707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7576877A Expired JPS6019686B2 (en) | 1977-06-24 | 1977-06-24 | PWM modulation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6019686B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6358194U (en) * | 1986-10-06 | 1988-04-18 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5725157A (en) * | 1980-07-18 | 1982-02-09 | Fanuc Ltd | Triangular wave comparing circuit |
| US6339360B1 (en) | 2000-05-09 | 2002-01-15 | Peavey Electronics Corporation | Digital amplifier with pulse insertion circuit |
| JP4770292B2 (en) * | 2004-07-02 | 2011-09-14 | ヤマハ株式会社 | Pulse width modulation amplifier |
-
1977
- 1977-06-24 JP JP7576877A patent/JPS6019686B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6358194U (en) * | 1986-10-06 | 1988-04-18 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5410653A (en) | 1979-01-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1290822C (en) | Retriggerable monostable multivibrator | |
| KR850001645A (en) | Magnification circuit | |
| JPS6019686B2 (en) | PWM modulation method | |
| JP2956309B2 (en) | Signal receiving circuit | |
| SU765984A1 (en) | Amplitude-modulated signal demodulator | |
| SU921057A2 (en) | Signal shaper | |
| SU732800A1 (en) | Drive | |
| JPS60103980U (en) | phase modulation circuit | |
| JPS5829636Y2 (en) | Periodic signal deletion compensation device | |
| JPH048669Y2 (en) | ||
| SU677079A1 (en) | Time interval shaping arrangement | |
| SU960852A1 (en) | Timebase amplifier | |
| SU570026A1 (en) | Device for measuring time intervals | |
| SU372675A1 (en) | PULSE GENERATOR | |
| JPS6145715U (en) | digital magnetic recording device | |
| JPS589091U (en) | Pulse width modulation type inverter control device | |
| SU601819A1 (en) | Time-to-pulse converter | |
| JPS62169514A (en) | Edge trigger generating circuit | |
| JPS5987166U (en) | Semiconductor laser pulse width modulation circuit | |
| JPH0434583Y2 (en) | ||
| JPS55150028A (en) | Clock circuit for digital operation processor | |
| JPS5850462B2 (en) | Received data diagnostic circuit | |
| JPS58139198A (en) | Echo apparatus | |
| JPH0535972B2 (en) | ||
| JPS54159210A (en) | Emphasis circuit of fm modulator and demodulator |