JPS57111121A - Pulse width modulating method and its circuit by negative feedback circuit configuration - Google Patents

Pulse width modulating method and its circuit by negative feedback circuit configuration

Info

Publication number
JPS57111121A
JPS57111121A JP18710180A JP18710180A JPS57111121A JP S57111121 A JPS57111121 A JP S57111121A JP 18710180 A JP18710180 A JP 18710180A JP 18710180 A JP18710180 A JP 18710180A JP S57111121 A JPS57111121 A JP S57111121A
Authority
JP
Japan
Prior art keywords
signal
negative
pulse width
voltage
reference signal
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
JP18710180A
Other languages
Japanese (ja)
Inventor
Michihiko Nagao
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP18710180A priority Critical patent/JPS57111121A/en
Publication of JPS57111121A publication Critical patent/JPS57111121A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/08—Duration or width modulation ; Duty cycle modulation

Landscapes

  • Amplitude Modulation (AREA)

Abstract

PURPOSE:To obtain a pulse width modulation signal without using a carrier signal, by negative-feeding back a fundamental wave component of an output signal to an input so that this feedback signal always follows a reference signal. CONSTITUTION:A negative feedback circuit is constituted of a comparator and an LPF. In case when the comparator has a hystereses characteristic, the polarity of output voltage generated in a terminal 2 is switched to positive from negative when voltage of a signal (called a deviation signal) Ve of a difference between a reference signal Vs and a feedback signal Vf has become higher than hysteresis voltage Vh, or to negative from positive when voltage of the deviation signal Ve has become lower than hysteresis voltage -Vh, and a pulse width modulation signal Vo following the reference signal Vs is obtained. Since this signal Vo cannot be compared directly with the reference signal Vs, a fundamental wave component of the signal Vo is fetched through the LPF, is negative-fed back as a feedback signal Vf, and a differnce Ve=Vs-Vf from the reference signal Vs is obtained.
JP18710180A 1980-12-27 1980-12-27 Pulse width modulating method and its circuit by negative feedback circuit configuration Pending JPS57111121A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18710180A JPS57111121A (en) 1980-12-27 1980-12-27 Pulse width modulating method and its circuit by negative feedback circuit configuration

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18710180A JPS57111121A (en) 1980-12-27 1980-12-27 Pulse width modulating method and its circuit by negative feedback circuit configuration

Publications (1)

Publication Number Publication Date
JPS57111121A true JPS57111121A (en) 1982-07-10

Family

ID=16200116

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18710180A Pending JPS57111121A (en) 1980-12-27 1980-12-27 Pulse width modulating method and its circuit by negative feedback circuit configuration

Country Status (1)

Country Link
JP (1) JPS57111121A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6436110A (en) * 1987-07-10 1989-02-07 Paul Buiee E Co Ets Method and apparatus for pulse code modulation
US5457435A (en) * 1994-03-25 1995-10-10 Caterpillar Inc. Pulse width modulated driver
WO2004049569A1 (en) * 2002-11-22 2004-06-10 Koninklijke Philips Electronics N.V. Pwm generator
CN102130624A (en) * 2011-04-28 2011-07-20 江西中能电气科技有限公司 Hysteresis loop and carrier hybrid modulation method for voltage inverter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6436110A (en) * 1987-07-10 1989-02-07 Paul Buiee E Co Ets Method and apparatus for pulse code modulation
US5457435A (en) * 1994-03-25 1995-10-10 Caterpillar Inc. Pulse width modulated driver
WO2004049569A1 (en) * 2002-11-22 2004-06-10 Koninklijke Philips Electronics N.V. Pwm generator
CN102130624A (en) * 2011-04-28 2011-07-20 江西中能电气科技有限公司 Hysteresis loop and carrier hybrid modulation method for voltage inverter

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