JPH0357313A - Pwm control system - Google Patents

Pwm control system

Info

Publication number
JPH0357313A
JPH0357313A JP1193262A JP19326289A JPH0357313A JP H0357313 A JPH0357313 A JP H0357313A JP 1193262 A JP1193262 A JP 1193262A JP 19326289 A JP19326289 A JP 19326289A JP H0357313 A JPH0357313 A JP H0357313A
Authority
JP
Japan
Prior art keywords
triangular wave
voltage
power supply
input voltage
pwm control
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
JP1193262A
Other languages
Japanese (ja)
Inventor
Takashi Igarashi
尚 五十嵐
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP1193262A priority Critical patent/JPH0357313A/en
Publication of JPH0357313A publication Critical patent/JPH0357313A/en
Pending legal-status Critical Current

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  • Control Of Direct Current Motors (AREA)
  • Dc-Dc Converters (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。
(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、パワーMO8FET等のスイッチング素子を
オン,オ7駆動するのに適したPWM(PulssWi
dth Modulatlon)制御方式に関するもの
である。
Detailed Description of the Invention [Field of Industrial Application] The present invention is a PWM (Pulss Wire) suitable for driving switching elements such as power MO8FETs on and off.
dth Modulatlon) control system.

〔従来の技術〕[Conventional technology]

従来の技術として、PWM制御でモータを駆動する場合
を例にとって第5図を参照して説明する。
As a conventional technique, a case where a motor is driven by PWM control will be explained with reference to FIG. 5 as an example.

第5図はそのPWM制御にょるモータ駆動系のブロック
図である。これは、第5図に示すように、三角波発生部
11と、入力電圧変換部2と、コンパレータ3からなり
、そのコンパレータ3よb出力するPWM信号9によっ
てパフ−MOSFETSをオン,オフ駆動することによ
う、その負荷となるモータ6の可変速制御を行なうもの
となっている。
FIG. 5 is a block diagram of a motor drive system using PWM control. As shown in FIG. 5, this consists of a triangular wave generator 11, an input voltage converter 2, and a comparator 3, and the puff MOSFETs are turned on and off by the PWM signal 9 output from the comparator 3. In this way, variable speed control of the motor 6 serving as the load is performed.

なお図中、4は駆動用電源、7及び8は各MOSFET
5,モータ6の両端間にそれぞれ挿入された保護用ダイ
オードである。
In the figure, 4 is the drive power supply, 7 and 8 are each MOSFET.
5. Protection diodes inserted between both ends of the motor 6.

このとき、駆動用電源はその電圧VCCを標準値vcc
zとし、ある値vcctからVccs ’!での範囲と
する( Vcc1<Vcc2<Vccs)。1た第6図
は、前記電源の電圧が標準値vcczのときの入カ電圧
vINと出力電圧の平均値vou’rの関係を示すもの
であう、入力電圧VINがv工のとき出カ電圧VOU’
f’はVo (ただし、v0〉vI)、そノvrHがv
cczのときVoυTはVGC2 となる関係とする。
At this time, the driving power supply changes the voltage VCC to the standard value vcc.
z, and from a certain value vcct to Vccs'! (Vcc1<Vcc2<Vccs). FIG. 6 shows the relationship between the input voltage vIN and the average value vou'r of the output voltage when the voltage of the power supply is the standard value vccz.When the input voltage VIN is vmin, the output voltage VOU '
f' is Vo (where v0>vI), and vrH is v
When ccz, VoυT is assumed to be VGC2.

さらに、第7図に三角波発生部11よb発生する三角波
11mの波形を示し、この三角波の振幅は0▼から電源
電圧VCaまでとする。
Further, FIG. 7 shows the waveform of a triangular wave 11m generated by the triangular wave generator 11b, and the amplitude of this triangular wave is from 0▼ to the power supply voltage VCa.

ここで、第5図に示すPWM制御系において、第7図の
三角波11富を用いて、第6図の入出力の関係を満足さ
せるためには、入力電圧変換部2にその出力電圧V’I
Nと入力電圧VXHとの間に、V’lH=aXVB−1
−b    **e*e*eas (11ただし、a=
(Vo−Vccz)/(Vx−Vcc2)b=V6  
aV1 なる関数をあてればよい。しかし、電源の電圧vceが
下限値vcctに変化した場合、入力電圧vIがVc(
jlのとき、入力電圧変換部2の出力電圧はvcct 
より高くなる。このことは、入力電圧変換部2の出力電
圧がvcct となるのは入力電圧がVCCt よう低
いときである。また、三角波11&の振幅ぱO▼からv
cc1″&でなので、入力電圧がVCCt よう低い電
圧で出力電圧の平均値がvcctになる。これは出力電
圧の平均値をvoからvcci1で変化させる場合、入
力電圧は■IからVCCIより低い範囲となう、制御の
範囲が狭くなる。
Here, in the PWM control system shown in FIG. 5, in order to satisfy the input/output relationship shown in FIG. 6 using the triangular wave 11 shown in FIG. I
Between N and input voltage VXH, V'lH=aXVB-1
-b **e*e*eas (11, where a=
(Vo-Vccz)/(Vx-Vcc2)b=V6
All you have to do is apply the function aV1. However, when the power supply voltage vce changes to the lower limit value vcct, the input voltage vI changes to Vc(
jl, the output voltage of the input voltage converter 2 is vcct
Becomes higher. This means that the output voltage of the input voltage converter 2 becomes vcct when the input voltage is as low as VCCt. Also, the amplitude of the triangular wave 11 & is from O▼ to v
cc1''&, so when the input voltage is as low as VCCt, the average value of the output voltage will be vcct.This means that when changing the average value of the output voltage from vo to vcci1, the input voltage will be in the range from ■I to lower than VCCI. As a result, the range of control becomes narrower.

オた、電源の電圧VCCがvcc 3に変化したとき、
入力電圧vIがvcc 3のとき入力電圧変換部2の出
力電圧はVCC !より低くなる。そして三角波11m
の振幅は0▼からVcc 3 tでであるので、入力電
圧がvccsになっても出力電圧の平均値はvcc 3
より低い電圧となシ、入力電圧をvIからYea3tで
変化させても出力電圧の平均値はvoからvcc 3よ
り低い範囲hなシ、制御の範囲が狭くなる。その結果を
第8図に示す。
Also, when the power supply voltage VCC changes to vcc 3,
When the input voltage vI is vcc3, the output voltage of the input voltage converter 2 is Vcc! becomes lower. And triangular wave 11m
The amplitude of is from 0▼ to Vcc 3 t, so even if the input voltage becomes vccs, the average value of the output voltage is vcc 3
If the voltage is lower, even if the input voltage is changed from vI to Yea3t, the average value of the output voltage will be in the range h lower than vo to vcc3, and the control range will become narrower. The results are shown in FIG.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

以上のように従来のPWM制御では、電源の電圧が変化
した場合、制御の範囲が狭くなるとhう問題があった。
As described above, the conventional PWM control has a problem in that when the voltage of the power supply changes, the control range becomes narrower.

本発明は上記のような問題を解消するためになされたも
ので、電源電圧の変化に影響されることなく、所定の制
御範囲を得ることができるPWM制御方式を提供するこ
とを目的とする。
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a PWM control method that can obtain a predetermined control range without being affected by changes in power supply voltage.

〔課題を解決するための手段〕[Means to solve the problem]

本発明に係るPWM制御方式は、三角波発生部と入力電
圧変換部及びコンバレータから構成されるPWM制御系
において、前記三角波発生部よう発生する三角波として
、その波形の一部にデイレ部を設けてそのディレ時間の
周期に対する割合を電源電圧によって変化する三角波を
用いるようにしたものである。
In the PWM control system according to the present invention, in a PWM control system composed of a triangular wave generating section, an input voltage converting section, and a comparator, a delayed section is provided in a part of the waveform of the triangular wave generated by the triangular wave generating section. A triangular wave whose ratio of delay time to period changes depending on the power supply voltage is used.

〔作用〕[Effect]

本発明におけるPWM制御方式は、電源の電圧によって
その長さが変わるデイレ部を備えた三角波を用いること
により、電源の電圧が変化しても、制御の範囲が入力電
圧の範囲vIからV00に対して出力電圧の範囲をvo
からVcctで制御することが可能にZる。
The PWM control method of the present invention uses a triangular wave with a delay portion whose length changes depending on the power supply voltage, so that even if the power supply voltage changes, the control range is within the input voltage range vI to V00. to set the output voltage range to vo
It is possible to control with Vcct from Z.

〔実施例〕〔Example〕

以下、本発明の実施例を図について説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

第1図は本発明のPWM制御方式をモータ駆動系に適用
したときの一実施例を示すブロック図である。この実施
例にかいて第5図に示した従来例のものと異なる点は、
PWM制御系を構成する三角波発生部として、第3図に
示すように、振幅値がO▼から電源電圧筐で変化すると
きその0▼を一定時間保持するデイレ時間T1を有する
デイレ部21を備えた三角波1aを発生する三角波発生
部1を設け、その三角波1aのデイレ部21を電源の電
圧によってその長さを変えて変化させるようにしたこと
である。なお図中、同一符号は同一筐たは相当部分を示
し、記号T2は三角波1aのO▼から電源電圧筐で立ち
上がる立上b時間を示す。
FIG. 1 is a block diagram showing an embodiment in which the PWM control method of the present invention is applied to a motor drive system. The difference between this embodiment and the conventional example shown in FIG. 5 is as follows.
As shown in FIG. 3, the triangular wave generating section constituting the PWM control system includes a delay section 21 having a delay time T1 that maintains 0▼ for a certain period of time when the amplitude value changes from 0▼ in the power supply voltage range. A triangular wave generator 1 is provided which generates a triangular wave 1a, and the length of the delay portion 21 of the triangular wave 1a is changed by changing the voltage of the power supply. In the figure, the same reference numerals indicate the same cases or corresponding parts, and the symbol T2 indicates the rising time b of the triangular wave 1a from O▼ to the power supply voltage case.

ここで、上述の従来例と同様に、電源はその電圧VCC
の標準値をvcczとし、下限値vcctから上限値V
CO3の範囲とする。ただし、Vccx <Vacz 
<Vccsとする。筐た、第2図は電源の電圧がVCC
2のときの入力電圧VrNと出力電圧の平均値VOUT
の関係を示すものであシ、VINがv工のときVQUT
はVo (ただし、VO >VI ) 、VrNがVC
,lのεきvOυTはVCC2となる関係とする。
Here, as in the conventional example described above, the power supply has its voltage VCC
Let vccz be the standard value of
CO3 range. However, Vccx < Vacz
<Vccs. In Figure 2, the power supply voltage is VCC.
Average value of input voltage VrN and output voltage VOUT when 2
This shows the relationship between VQUT and VIN.
is Vo (however, VO > VI ), and VrN is VC
, l, ε and vOυT are assumed to be VCC2.

しかして、第1図の実施例において、第3図の三角波1
mを用いて第2図の入出力の関係を満足するデイレ時間
T1は次のようになる。すなわち、デイレ部21をもつ
三角波1aの振幅をVSOとし、電源の電圧をVCaと
すると、第3図のデイレ時間T1の割合は次式で表わせ
る。
Therefore, in the embodiment of FIG. 1, the triangular wave 1 of FIG.
The delay time T1 that satisfies the input/output relationship shown in FIG. 2 using m is as follows. That is, when the amplitude of the triangular wave 1a having the delay portion 21 is VSO and the voltage of the power supply is VCa, the ratio of the delay time T1 in FIG. 3 can be expressed by the following equation.

筐た、三角波1aの振幅V80は電源電圧に比例するの
で、T1の割合は ただしs v80 ”’&vCC と々る。
However, since the amplitude V80 of the triangular wave 1a is proportional to the power supply voltage, the ratio of T1 is s v80 ''&vCC.

したがって、三角波1&のデイレ時間T,に上記のよう
な電源電圧の関数をあてることにより、電源電圧が変化
しても、第4図に示すように、制御の範囲は入力電圧W
INの範囲vIからVacに対して出力電圧の範囲をv
oからMCatで制御することが可能となる。なか、第
4図は電源電圧が変化した場合の入出力特性を示す。
Therefore, by applying the above power supply voltage function to the delay time T, of the triangular wave 1&, even if the power supply voltage changes, the control range is within the input voltage W, as shown in FIG.
From the IN range vI to Vac, the output voltage range is v
It becomes possible to control with MCat from o. Among them, FIG. 4 shows the input/output characteristics when the power supply voltage changes.

上述の実施例では三角波発生部,入力電圧変換部,コン
パレータから構成されるPWM制御に適用した場合であ
ったが、本発明は、それに類似した構成のPWM制御に
も同様に適用することができる。
Although the above embodiment is applied to PWM control consisting of a triangular wave generator, an input voltage converter, and a comparator, the present invention can be similarly applied to PWM control with a similar configuration. .

〔発明の効果〕〔Effect of the invention〕

以上のように本発明によれば、PWM制御の三角波発生
部より発生する三角波として、その波形の一部にデイレ
部をもつ三角波を用いることにより、電源の電圧が変化
しても、その入出力の関係がずれることはなく、従来の
ものに比べて、制御の範囲を広〈とることができ、特に
PWMでモータの可変速を行う場合に有効である。
As described above, according to the present invention, by using a triangular wave having a delayed part in a part of its waveform as the triangular wave generated by the PWM-controlled triangular wave generating section, even if the voltage of the power supply changes, the input/output The relationship between the two does not deviate, and the range of control can be expanded compared to the conventional method, which is particularly effective when variable speed of the motor is performed using PWM.

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

第1図は本発明の一実施例のブロック図、第2図は上記
実施例の説明に供する入出力特性図、第3図は上記実施
例に用いた三角波の波形図、第4図は上記実施例より得
られる電源電圧が変化したときの入出力特性を示す図、
第5図は従来のPWM制御の一例を示すブロック図、第
6図は従来例の説明に供する入出力特性図、第7図は従
来のPWM制御に用いている三角波の波形図、第8図は
従来例による電源電圧が変化したときの入出力特性を示
す図である。 1●●●・三角波発生部、1a●●●●デイレ部をもつ
三角波、2・●●●入力電圧変換部、3●●●●コンパ
レータ、4●●●●電源、5●●●●パワーMOSFE
T,6●●●●モータ。
Fig. 1 is a block diagram of one embodiment of the present invention, Fig. 2 is an input/output characteristic diagram for explaining the above embodiment, Fig. 3 is a waveform diagram of the triangular wave used in the above embodiment, and Fig. 4 is the above A diagram showing the input/output characteristics when the power supply voltage changes obtained from the example,
Fig. 5 is a block diagram showing an example of conventional PWM control, Fig. 6 is an input/output characteristic diagram for explaining the conventional example, Fig. 7 is a waveform diagram of a triangular wave used in conventional PWM control, and Fig. 8 1 is a diagram showing input/output characteristics when the power supply voltage changes according to a conventional example. 1●●●・Triangular wave generator, 1a●●●●Triangular wave with delay section, 2・●●●Input voltage conversion section, 3●●●●Comparator, 4●●●●Power supply, 5●●●●Power MOSFE
T, 6●●●● motor.

Claims (1)

【特許請求の範囲】[Claims] 三角波発生部と、入力電圧変換部と、これら入力電圧変
換部の出力電圧と三角波発生部の三角波を比較してPW
M信号を出力するコンパレータからなり、前記入力電圧
変換部の入力電圧が一定の値から電源電圧までの範囲で
変化するのに対して、出力電圧が所定の値から電源電圧
までの範囲で変化させる形式のPWM制御において、前
記三角波発生部より発生する三角波として、デイレ部を
備えた三角波を用いることを特徴とするPWM制御方式
The triangular wave generator, the input voltage converter, and the output voltage of these input voltage converters are compared with the triangular wave of the triangular wave generator.
It consists of a comparator that outputs an M signal, and while the input voltage of the input voltage conversion section changes within a range from a constant value to the power supply voltage, the output voltage changes within the range from a predetermined value to the power supply voltage. A PWM control method characterized in that a triangular wave having a delay section is used as the triangular wave generated by the triangular wave generating section.
JP1193262A 1989-07-26 1989-07-26 Pwm control system Pending JPH0357313A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1193262A JPH0357313A (en) 1989-07-26 1989-07-26 Pwm control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1193262A JPH0357313A (en) 1989-07-26 1989-07-26 Pwm control system

Publications (1)

Publication Number Publication Date
JPH0357313A true JPH0357313A (en) 1991-03-12

Family

ID=16305020

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1193262A Pending JPH0357313A (en) 1989-07-26 1989-07-26 Pwm control system

Country Status (1)

Country Link
JP (1) JPH0357313A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006180666A (en) * 2004-12-24 2006-07-06 Sanyo Electric Co Ltd Pwm signal generating circuit
CN102635564A (en) * 2012-02-27 2012-08-15 石家庄市公共交通总公司 Air-conditioning blower control system of natural gas bus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50151049A (en) * 1974-05-23 1975-12-04
JPS61227663A (en) * 1985-03-30 1986-10-09 Toshiba Corp Chopper controller

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50151049A (en) * 1974-05-23 1975-12-04
JPS61227663A (en) * 1985-03-30 1986-10-09 Toshiba Corp Chopper controller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006180666A (en) * 2004-12-24 2006-07-06 Sanyo Electric Co Ltd Pwm signal generating circuit
CN102635564A (en) * 2012-02-27 2012-08-15 石家庄市公共交通总公司 Air-conditioning blower control system of natural gas bus

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