[특허]Fluid heating control system

[미국특허] Fluid heating control system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F24H-001/10
출원번호	US-0334337 (1999-06-16)
발명자 / 주소	Seitz David E. Sharp David Paul Harman Thomas Lamson Everett Louis J. Neumann Rodney H.
출원인 / 주소	David Seitz
대리인 / 주소	Bushman
인용정보	피인용 횟수 : 132 인용 특허 : 18

초록 ▼

An improved system, method and apparatus for control of an instantaneous flow-through fluid heater system is disclosed. The control incorporates a logic control method providing modulation of power in small steps to a plurality of heating elements retaining responsiveness to closed-loop control needs without inducing light flicker. Further, the life of the coils of heating circuit electromechanical relays are extended by energizing the coils with a pulse-width-modulated drive decreasing in duty cycle and thus the latent coil heat when an increase in mains voltage is sensed. The life of the contacts of same relays are extended by inhibiting heating element triac drive immediately upon sensing loss of relay coil power, such as by an over temperature limit switch opening, thus ensuring that relay contacts open with zero heating element current. In addition to the software "watchdog timer" internal to the microcontroller, a redundant fail-safe circuit external to the microcontroller prevents a program lockup condition from leaving any heating element triac or relay drive in an energized state. A combination of control hardware and program provide self-diagnostic detection of an inoperative thermistor, stuck relay, or a failed triac or heating element. An improved means of sensing water level is disclosed incorporating a low-level, high frequency signal, allowing detection of non-conducting distilled water and the reliable detection of water in the presence of main-frequency currents as would exist in ungrounded sheathed heating elements with electrical leakage or as would exist with bare-elements.

대표청구항 ▼

[ What is claimed is:] [1.]1. A fluid heater powered by an alternating current (AC) electric power source, said heater comprising:a housing having at least one chamber, said housing having a fluid inlet and a fluid outlet;a plurality of electrically powered heating elements, each of said plurality of heating elements positioned within a respective one of said at least one chamber for heating a flowing fluid;a power controller for controlling the connection of each of said plurality of heating elements to the AC power source such that each of said plurality of heating elements is connected for at least one half cycle of each of the plurality of power cycle patterns defining a power level, the plurality of power levels at which said plurality of heating elements operate are selected from the group consisting of 0/2x, 12.5/2x, 25/2x, 37.5/2x, 50/2x, 62.5/2x, 75/2x, 87.5/2x and 100/2x, wherein a numerator of each of these fractions represents the number of half cycles of an x Hz AC power source within one second during which said plurality of heating elements are powered, wherein the operation of each of said plurality of heating elements is sequentially timed to substantially reduce switching frequencies which otherwise would cause visually perceptible lighting flicker from the AC power source;one or more fluid temperatures sensors each responsive to fluid temperature at a selected location within the at least one chamber; anda logic circuit for controlling a desired temperature of the flowing fluid from the fluid outlet, said logic circuit receiving temperature information from the one or more fluid temperature sensors and providing temperature information to said power controller.

이 특허에 인용된 특허 (18) 인용/피인용 타임라인 분석

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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

내보내기 구분	파일저장 인쇄 메일전송
구성항목	기본정보 상세정보 관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표IPC 관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 공고번호, 공고일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표출원인, 출원인국적, 출원인주소, 발명자, 발명자E, 발명자코드, 발명자주소, 발명자 우편번호, 발명자국적, 대표IPC, IPC코드, 요약, 미국특허분류, 대리인주소, 대리인코드, 대리인(한글), 대리인(영문), 국제공개일자, 국제공개번호, 국제출원일자, 국제출원번호, 우선권, 우선권주장일, 우선권국가, 우선권출원번호, 원출원일자, 원출원번호, 지정국, Citing Patents, Cited Patents
저장형식	Text(ASCII format) Excel format PIAS분석(.xls)
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
안내	총 건의 자료가 검색되었습니다. 다운받으실 자료의 인덱스를 입력하세요. (1-10,000) 검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다. 데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요) 다운로드 파일은 UTF-8 형태로 저장됩니다. 파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오. ~ Text(ASCII format) Excel format

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