[특허]Method and apparatus for controlling the current through a magnetic coil

[미국특허] Method and apparatus for controlling the current through a magnetic coil 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02H-003/093 H01H-047/32
출원번호	US-0344526 (1994-11-23)
우선권정보	DE-4140586 (1991-12-10)
발명자 / 주소	Wallaert Johan (Assebroek BEX)
출원인 / 주소	Clark Equipment Company (Statesville NC 02)
인용정보	피인용 횟수 : 71 인용 특허 : 0

초록 ▼

Apparatus and method for controlling current flow through a magnetic coil actuator of a solenoid valve. The current through the magnetic coil is measured by sensing the voltage drop across a precision resistor in series with the coil. The apparatus includes a power switch for alternately switching the coil on and off. A flyback diode is coupled in parallel with the coil for operation during coil shut-off. A first voltage sensor continuously measures the combined voltage drop across the coil and the power switch. A second sensor, coupled across the precision resistor, samples the current flowing through the coil. The samplings occur synchronously with coil turn-on, and are delayed by a predetermined time delay which is long enough to allow the current flowing through the coil to reach steady state before the current is sampled. Circuitry is provided for employing the sensed voltage signal and current samplings to produce a signal whose value is a function of the resistive component of coil impedance. Control circuitry turns the coil on at a fixed frequency. The control circuitry, however, adjusts the duration of the coil turn-on, i.e., the duty cycle, as a function of instantaneous voltage across the combined coil and power switch and also as a function of coil resistance in order to maintain current near a predetermined reference value.

대표청구항 ▼

A method for maintaining a non-zero current flow through a coil near a desired value, the coil connected in series with a resistor and with a switch and coupled to an external source of substantially d.c. electrical potential difference to energize the coil, the switch controlling energization of the coil by the external source and being switchable between a closed position permitting energization of the coil and an open position preventing energization of the coil, said method comprising the steps of: a) measuring a value of a voltage drop across the resistor; b) measuring a value of a voltage drop across the coil; c) determining a value of current flow through the coil based on the measured value of resistor voltage drop and a resistance of the resistor; d) determining a value of resistance of the coil based on the measured value of coil voltage drop and the determined value of current flow through the coil; e) determining a portion of a predetermined cycle time period during which the switch should closed thereby supplying a pulsed signal to the coil so as to maintain the current flow through the coil near the desired current flow based on the determined values of the current flow through the coil and the coil resistance; f) alternately opening and closing the switch such that it is closed for the determined portion of each cycle time period to energize the coil; and g) repeating steps a) through f) at predetermined, regular intervals of time so as to determine a revised value for a portion of the predetermined cycle time period during which the switch should be closed and, based on the revised portion of cycle time value, adjusting the opening and closing of the switch such that it is closed for the revised portion of the cycle time to energize the coil.

이 특허를 인용한 특허 (71) 인용/피인용 타임라인 분석

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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)
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[미국특허] Method and apparatus for controlling the current through a magnetic coil 원문보기

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[미국특허] Method and apparatus for controlling the current through a magnetic coil 원문보기

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