JPS645360A - Power-controlling pwm signal generator - Google Patents
Power-controlling pwm signal generatorInfo
- Publication number
- JPS645360A JPS645360A JP62158433A JP15843387A JPS645360A JP S645360 A JPS645360 A JP S645360A JP 62158433 A JP62158433 A JP 62158433A JP 15843387 A JP15843387 A JP 15843387A JP S645360 A JPS645360 A JP S645360A
- Authority
- JP
- Japan
- Prior art keywords
- pwm
- comparators
- vicinity
- triangular wave
- peak values
- 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 prevent the breakdown of element by providing first and second comparators at respective positive and negative symmetric levels in tie vicinity of the upper and lower peak points out of triangular wave signals and by forbidding an ignition signal in the vicinity of said peak values. CONSTITUTION:A PWM signal generator generates a PWM control signal from ROM 12; and is composed of counter 11, D/A converter 14, interpolation circuit 21, PWM modulator 22, triangular wave generator 23, comparators 24-25, rise/fall detector 32, forced set/reset circuit 37, flip-flop 40 and others. Then, a reference voltage is given to comparators 24-25 so that minute PWM modulation signals are generated when control signals a little lower and higher than the peak values of triangular wave signals and respectively having the same absolute value exceed said level. Thus, because an ignition signal is forbidden in the vicinity of the peak values of said triangular waves, the phase lag of a pulse does not occur to enable a PWM control with high accuracy.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62158433A JPS645360A (en) | 1987-06-24 | 1987-06-24 | Power-controlling pwm signal generator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62158433A JPS645360A (en) | 1987-06-24 | 1987-06-24 | Power-controlling pwm signal generator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS645360A true JPS645360A (en) | 1989-01-10 |
Family
ID=15671655
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62158433A Pending JPS645360A (en) | 1987-06-24 | 1987-06-24 | Power-controlling pwm signal generator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS645360A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06203982A (en) * | 1992-12-26 | 1994-07-22 | U R D:Kk | Fluorescent lamp lighting system |
-
1987
- 1987-06-24 JP JP62158433A patent/JPS645360A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06203982A (en) * | 1992-12-26 | 1994-07-22 | U R D:Kk | Fluorescent lamp lighting system |
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