JPS6473816A - Pulse width modulation control circuit - Google Patents
Pulse width modulation control circuitInfo
- Publication number
- JPS6473816A JPS6473816A JP23072187A JP23072187A JPS6473816A JP S6473816 A JPS6473816 A JP S6473816A JP 23072187 A JP23072187 A JP 23072187A JP 23072187 A JP23072187 A JP 23072187A JP S6473816 A JPS6473816 A JP S6473816A
- Authority
- JP
- Japan
- Prior art keywords
- carrier
- sine wave
- generator
- reference sine
- approximated
- 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
Links
Landscapes
- Inverter Devices (AREA)
Abstract
PURPOSE:To reduce a high frequency component included in output, by preserving a reference waveform in which a phase angle is divided in (n) steps and approximated as (m) reference waveforms by phase-shifting at every 2pi/n.m, setting a carrier frequency at a sufficiently large value, and obtaining a PWM signal by sequentially selecting the reference waveform at every carrier frequency. CONSTITUTION:A reference waveform generator 10 is provided with a ring counter 10A which issues a prescribed access timing signal based on a frequency command, and (m) ROMs 10B divided to (n) steps and approximated to each address and store reference sine wave data phase-shifted by 2pi/n.m, respectively. A carrier generator 20 generates a carrier which sets the number of carriers included in one step of the reference sine wave sufficiently larger than (m). A selector 40 selects the (m) reference sine waves sequentially at every carrier cycle of the carrier generator 20, and obtains a pulse modulation signal by comparing the sequentially selected reference sine wave with the carrier.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23072187A JPS6473816A (en) | 1987-09-14 | 1987-09-14 | Pulse width modulation control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23072187A JPS6473816A (en) | 1987-09-14 | 1987-09-14 | Pulse width modulation control circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6473816A true JPS6473816A (en) | 1989-03-20 |
Family
ID=16912267
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23072187A Pending JPS6473816A (en) | 1987-09-14 | 1987-09-14 | Pulse width modulation control circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6473816A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007514391A (en) * | 2003-12-11 | 2007-05-31 | コンティ テミック マイクロエレクトロニック ゲゼルシャフト ミット ベシュレンクテル ハフツング | Control method for pulse width modulation of multiple load elements |
-
1987
- 1987-09-14 JP JP23072187A patent/JPS6473816A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007514391A (en) * | 2003-12-11 | 2007-05-31 | コンティ テミック マイクロエレクトロニック ゲゼルシャフト ミット ベシュレンクテル ハフツング | Control method for pulse width modulation of multiple load elements |
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