EP0163746A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Pwm inverter apparatus
Assignee: Panasonic Ecology Systems Co Ltd
•
Filing: 1984-11-22
•
Granted: —
•
Expires: 2004-11-22
Abstract
Abstract A PWM inverter apparatus controls the rotational speed of a motor (9) by setting the carrier frequency of a PWM- generated voltage at between 8 kHz to 16 kHz, to limit electric noise generated to within the non-audible range. A control circuit section (2) is provided with a triangular wave oscillator (11) which varies the frequency in accordance with a signal from a frequency setting section (1), so as to control the rotational speed of the motor (9) so that the level of electric noise generated can be reduced to a desirable value.
Inventors
- 👤 Shigeki Yamane
- 👤 Keijiro Mori
- 👤 Kyooya Sakamoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 03:56
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/539; H02M7/5395
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
76 words
A PWM inverter apparatus comprising a frequency setting part setting the frequency, a control circuit part generating a PWM signal in response to the signal from said frequency setting part, a phase drive part receiving the PWM signal from said control circuit part, and a DC power source part connected to said phase drive part, the carrier frequency of the PWM signal from said control circuit part being selected to be 8 kHz - 24 kHz.
Claim 2
Dependent Claim
76 words
A PWM inverter apparatus comprising a frequency setting part setting the frequency, a control circuit part generating a PWM signal in response to the signal from said frequency setting part, a phase drive part receiving the PWM signal from said control circuit part, and a DC power source part connected to said phase drive part, the carrier frequency of the PWM signal from said control circuit part being selected to be 8 kHz - 24 kHz.
Claim 3
Dependent Claim
78 words
A PWM inverter apparatus comprising a frequency setting part setting the frequency, a control circuit part generating a PWM signal in response to the signal . from said frequency setting part, a phase drive part receiving the PWM signal from said control circuit part, and a DC power source part connected to said phase drive part, the carrier frequency of the PWM signal from said control circuit part being varied by the signal from said frequency setting part.
Claim 4
Dependent Claim
78 words
A PWM inverter apparatus comprising a frequency setting part setting the frequency, a control circuit part generating a PWM signal in response to the signal . from said frequency setting part, a phase drive part receiving the PWM signal from said control circuit part, and a DC power source part connected to said phase drive part, the carrier frequency of the PWM signal from said control circuit part being varied by the signal from said frequency setting part.
Claim 5
Dependent Claim
68 words
A PMM inverter apparatus according to claim 1, wherein said control circuit part 1 is composed of a fundamental wave oscillating part oscillating a fundamental wave and a triangular wave oscillating part making self-excited oscillation, in response to the signal from said frequency setting part, and a comparing part generating its output by comparing the outputs of said fundamental wave oscillating part and said triangular wave oscillating part.
Claim 6
Dependent Claim
65 words
A PWM inverter apparatus according to claim 1, wherein said phase drive part is composed of a first and a second power switching element connected in series, and a first and a second gate drive part alternately turning on-off said first and second power switching elements in response to the PWM signal from said control circuit part, and said power switching elements are power MOS-FET's.
Claim 7
Dependent Claim
21 words
A PWM inverter apparatus according to claim 1, wherein said carrier frequency is selected to be 8 kHz - 16 kHz.
Claim 8
Dependent Claim
21 words
A PWM inverter apparatus according to claim 1, wherein said carrier frequency is selected to be 16 kHz - 24 kHz.
Claim 9
Dependent Claim
67 words
A PWM inverter apparatus according to claim 2, wherein said control circuit part is composed of a fundamental wave oscillating part oscillating a fundamental wave and a triangular wave oscillating part varying the frequency, in response to the signal from said frequency setting part, and a comparing part generating its output by comparing the outputs of said fundamental wave oscillating part and said triangular wave oscillating part.
Claim 10
Dependent Claim
77 words
A PWM inverter apparatus according to claim 2, wherein said control circuit part is composed of a fundamental wave oscillating part oscillating a fundamental wave in response to the signal from said frequency setting part, a triangular wave oscillating part decreasing the frequency in response to the incremental signal from said frequency setting part, and a comparing part generating its output by comparing the outputs of said fundamental wave oscillating part and said triangular wave oscillating part.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.