[특허]Closed loop pulse width modulator inverter with volt-seconds feedback control

Closed loop pulse width modulator inverter with volt-seconds feedback control 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02M-001/12
출원번호	US-0987498 (1992-12-07)
발명자 / 주소	Garces Luis J. (Raleigh NC) Sember James W. (Zebulon NC)
출원인 / 주소	Square D Company (Palatine IL 02)
인용정보	피인용 횟수 : 71 인용 특허 : 0

초록 ▼

A closed loop pulse width modulator (PWM) inverter corrects for variations and distortion in the output AC voltage waveform caused by non-linearities of the switching devices or changes in the DC link voltage. A signal is generated that is a volt-seconds representation of the voltage error between a voltage command and the actual AC output voltage of the PWM inverter. The volt-seconds error signal becomes a controlling means in the closed loop of the PWM inverter to regulate the output AC voltage of the PWM inverter. Another signal that represents changes in the DC link voltage also modifies the voltage command signal. The system will compensate for the non-linear behavior of the PWM inverter due to deadtime, minimum on-times and off-times, and DC link voltage variations and voltage drops across the switching devices, and will also allow the operation of the inverter in a linear fashion for the region of operation when one or more of its phases are saturated, i.e., either full on or full off.

대표청구항 ▼

A closed loop pulse width modulator for converting DC to AC electrical power comprising: a) a DC source voltage; b) an inverter switching means connected across said DC source voltage to produce said AC electrical power in response to switching command signals generated by a PWM command circuit, said PWM command circuit generating said switching command signals in accordance with a voltage command signal; c) an on-delay means for preventing said switching command signals from causing said inverter switching means from short-circuiting said DC source; d) a first voltage detection means for measuring said DC source voltage to detect variations in said DC source voltage; e) a second voltage detection means for measuring said AC electrical power and generating a voltage error signal that represents a difference between the voltage command signal and the AC electrical power; f) an integration means for converting said voltage error signal to a volt-seconds representation of said voltage error signal; g) a scaling and normalizing circuit and a multiplier for modifying said voltage command signal for said variations in said DC source voltage: and h) wherein said volt-seconds representation of said voltage error signal further modifies said voltage command signal until said voltage error signal is equal to zero, said modification to continuously correct for distortions in said AC electrical power caused by said on-delay means.

이 특허를 인용한 특허 (71)

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Closed loop pulse width modulator inverter with volt-seconds feedback control 원문보기

초록 ▼

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연합인증

Closed loop pulse width modulator inverter with volt-seconds feedback control 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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이 특허를 인용한 특허 (71)

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