Title:
TRIANGULAR WAVE GENERATING CIRCUIT
Document Type and Number:
Japanese Patent JP3906982
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a triangular wave generating circuit suitable for the PWM control of a semiconductor power converting circuit.
SOLUTION: The circuit is composed of resistors R1-R4, diodes D1-D3, a capacitor C, a comparator element Cp having the output terminal of an open collector system and a control power source with an intermediate potential point (0V) as a reference potential terminal (ground symbol). In this comparator element Cp, when the potential of an inverted input terminal is lower than the potential of a non-inverted input terminal, the output terminal is turned off and when the potential of the inverted input terminal is higher than the potential of the non-inverted input terminal, the output terminal is turned on. Thus, a triangular wave voltage having a minimum value of both terminal voltages equal to 0V can be generated in both the terminals of the capacitor C.
Inventors:
Yoshihiko Yamagata
Application Number:
JP2002005653A
Publication Date:
April 18, 2007
Filing Date:
January 15, 2002
Export Citation:
Assignee:
Fuji Electric Systems Co., Ltd.
International Classes:
H02M1/08; H03K4/06; (IPC1-7): H03K4/06; H02M1/08
Domestic Patent References:
| JP56136021A | ||||
| JP58205326A | ||||
| JP58213522A | ||||
| JP4322514A |
Attorney, Agent or Firm:
Iwao Yamaguchi
Yoshihide Komada
Kiyoshi Matsuzaki
Yoshihide Komada
Kiyoshi Matsuzaki