JPS55140327A - Pulse width modulator - Google Patents

Pulse width modulator

Info

Publication number
JPS55140327A
JPS55140327A JP4823979A JP4823979A JPS55140327A JP S55140327 A JPS55140327 A JP S55140327A JP 4823979 A JP4823979 A JP 4823979A JP 4823979 A JP4823979 A JP 4823979A JP S55140327 A JPS55140327 A JP S55140327A
Authority
JP
Japan
Prior art keywords
voltages
pulse width
output
wave
always
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
JP4823979A
Other languages
Japanese (ja)
Inventor
Yukio Kino
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.)
NIPPON HAMONDO KK
Original Assignee
NIPPON HAMONDO KK
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 NIPPON HAMONDO KK filed Critical NIPPON HAMONDO KK
Priority to JP4823979A priority Critical patent/JPS55140327A/en
Publication of JPS55140327A publication Critical patent/JPS55140327A/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

  • Amplifiers (AREA)

Abstract

PURPOSE:To set always the average DC potential to the earth level to prevent click sound, by using a saw tooth wave or a triangular wave as the input signal and by varying the duty ratio of the output square wave by the modulation signal. CONSTITUTION:Saw tooth wave Vin 11 is input to comparator CMPA11, and voltages VD1 and VS1 are varied by modulation signal Vref 12 connected in parallel to DC power sources A12 and A13 which supply positive and negative DC voltages VD1 and VS1 of CMPA11. Therefore, the threshold voltage is always 1/2(VD1+VS1) for voltages VD1 and VS1, which determine the output crest value, and is variable for the earth level to vary the pulse width of the output square wave. Simultaneously, positive and negative crest values of output signal Vout 13 is caused to be proportional to voltages VD1 and VS1 by voltages VD1 and VS1, and control is so performed that the average value DC potential of the output square wave which has the pulse width modulated may be always the earth level. Thus, click sound at a demodulation time can be prevented from being generated.
JP4823979A 1979-04-18 1979-04-18 Pulse width modulator Pending JPS55140327A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4823979A JPS55140327A (en) 1979-04-18 1979-04-18 Pulse width modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4823979A JPS55140327A (en) 1979-04-18 1979-04-18 Pulse width modulator

Publications (1)

Publication Number Publication Date
JPS55140327A true JPS55140327A (en) 1980-11-01

Family

ID=12797886

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4823979A Pending JPS55140327A (en) 1979-04-18 1979-04-18 Pulse width modulator

Country Status (1)

Country Link
JP (1) JPS55140327A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61256825A (en) * 1985-05-09 1986-11-14 Matsushita Electric Ind Co Ltd Pwm digital-analog converter
JPS61264920A (en) * 1985-05-20 1986-11-22 Matsushita Electric Ind Co Ltd Digital-analog converter
US6342822B1 (en) 2000-11-28 2002-01-29 Fairchild Semiconductor Corporation Method and apparatus for implementing improved pulse width modulation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61256825A (en) * 1985-05-09 1986-11-14 Matsushita Electric Ind Co Ltd Pwm digital-analog converter
JPS61264920A (en) * 1985-05-20 1986-11-22 Matsushita Electric Ind Co Ltd Digital-analog converter
US6342822B1 (en) 2000-11-28 2002-01-29 Fairchild Semiconductor Corporation Method and apparatus for implementing improved pulse width modulation

Similar Documents

Publication Publication Date Title
ATE306801T1 (en) DIGITAL PULSE WIDTH MODULATION GENERATOR
KR830006695A (en) Electronic electricity meter
GB1560350A (en) Pulse-width modulators
ES483999A1 (en) Switched-mode voltage converter
JPS559147A (en) Electric power meter
JPS55140327A (en) Pulse width modulator
JPS56101379A (en) Controlling method and apparatus for pulse width modulating inverter
GB935242A (en) Improvements in pulse width modulators
JPS57111121A (en) Pulse width modulating method and its circuit by negative feedback circuit configuration
JPS5590133A (en) Pulse-width modulator
RU2046528C1 (en) Method for controlling follow-up pulsed converter
SU651472A1 (en) Pulse-width modulator
JPS56119883A (en) Sound timepiece
JPS56132020A (en) Pulse width modulating circuit
SU964969A1 (en) Pulse-width amplifier
GB1040244A (en) An inverter arrangement
SU1161961A1 (en) Multiplying device
JPS6472620A (en) Pulse width modulation type d/a converter
JPS54161371A (en) Wattmeter
SU375778A1 (en) ENERGY CONVERTER OF PERMANENT AND ALTERNATING CURRENT IN AMOUNT OF IL \ PULTS
JPS5731001A (en) Analog input device
JPS52100865A (en) Signal conversion circuit
SU1125551A1 (en) Wide-band ac-to-dc voltage converter
SU809220A1 (en) Operational timebase amplifier
JPS57177281A (en) Power supplying method using converter