Abstract:
A switch state detector for use in a system wherein a plurality of n switches (S1,..., Sn) produces on a single line (22) a number of discrete voltage levels each representative of one particular state of open and closed switches. The switch state detector comprises a plurality of reference voltage sources each of which corresponds to one of the discrete voltage levels and a set of comparators (C1,..., Cm-1) each having a first input connected to the single line (22) and a second input connected to one of the reference voltage sources. The switch state detector further comprises a decoder (24) with inputs receiving the outputs from the comparators (C1,..., Cm-1) and with outputs (28) providing a digital representation of the particular state of each of the switches (S1,..., Sn). There is further provided an encoder comprising a plurality of n switches (S1,..., Sn) and encoding circuitry interconnecting said n switches as well as a method for communicating an information representative of a particular state of a plurality of n open and closed switches on a single line (22).
Abstract:
A first current is driven through a first current path from a first common node, through a key matrix, and to a second common node when a key is pressed. A first measurement of the first current path resistance is made. A second current is then driven through a second current path from the second common node, through the key matrix, and to the first common node. A second measurement of the second current path resistance is made. The first and second measurements are used to identify the key that was pressed. Each key corresponds to a unique pair of first and second measurement values. In one example, non-linear resistance circuits are disposed at the ends of the row and column conductors of the key matrix such that a row resistor in the first current path is measured independently of a column resistor in the second current path.
Abstract:
An electronic equipment which provides an easier-to-use interface for the changing of the settings of various parameters on an LCD panel or the screen of a computer by the pushing by a user of a simple ON/OFF switch or holding it down, includes a switch connected to a pressure-sensitive unit, a processing circuit that performs processing depending on an output value of the switch, and a display unit that displays the results of processing of the processing circuit. The processing circuit changes the settings of parameters of electronic equipment in increments depending on the output value of the switch.
Abstract:
An electronic circuit providing a linear keypad and an apparatus comprising such electronic circuit are provided. Methods for detecting that a button of a linear keypad is being pressed and for determining which button is being pressed are also provided. A method for calibrating an apparatus comprising a linear keypad to enable the subsequent determination by the apparatus of which button of the linear keypad is being pressed is also provided.
Abstract:
The invention is, in its various aspects, an apparatus and a method for scanning a keypad or a keyboard. The apparatus (20, 80) comprises a keypad (25, 88) and an integrated circuit (30, 84). The keypad includes a plurality of chained resistors (24) and a plurality of key switches (22, 86). Each of the plurality of key switches (22, 86) is tied to a common node (35, 92) at a first terminal (34, 87) thereof and tapping the chained resistors (24, 90) at a second node (44, 89) thereof. Each of the key switches (22, 86) generates a signal indicative of the respective key switch (22, 86) being pressed when the key switch (22, 86) is pressed. The integrated circuit (30, 84) is capable of receiving the generated signal. The integrated circuit (30, 84) furthermore includes an analog to digital converter (45 & 46, 100) capable of generating a reference signal and a circuit capable of determining which key switch (22, 86) has been pressed from the magnitude of the generated voltage signal and the reference signal. The method for scanning a keypad comprises generating a voltage signal whose magnitude indicates which key (22, 86) is being pressed, and determining from the magnitude of the generated voltage signal which key (22, 86) was pressed.
Abstract:
Die erfindungsgemäße Stromverteileinheit (10) umfasst eine Lastdetektionseinheit (20) für wenigstens einen an der Lastdetektionseinheit (20) angeordneten elektrischen Kontakt (21, 22, 23, 24) zum Messen einer Detektionsspannung (UD) zur Prüfung einer Belegung des Kontakts (21, 22, 23, 24). Die Erfindung ist dadurch gekennzeichnet, 1. die Lastdetektionseinheit (20) für eine Vielzahl von elektrischen Kontakten (21, 22, 23, 24) eingerichtet ist, von denen jeder mit wenigstens einem parallel zu den Kontakten (21, 22, 23, 24) geschalteten Schalter (S1, S2, S3, Sn) versehen ist und wobei die Lastdetektionseinheit (20) jeweils einen zu einem der Schalter (S1, S2, S3, Sn) paarweise parallel angeordneten Widerstand (R1, R2, R3, Rn) aufweist und die Parallelschaltungen (S1 mit R1; S2 mit R2, S3 mit R3,..., Sn mit Rn) in Stromrichtung eines Prüfstroms (I) in Reihe geschaltet sind. Die Erfindung betrifft ferner ein Verfahren zum Messen einer Detektionsspannung (UD) und eine Verwendung einer erfindungsgemäßen Stromverteileinheit (10).
Abstract:
La présente invention concerne un système de surveillance (10) redondant et dissimilaire de l'état de contacteurs (22) d'une poignée de commande (20) d'un aéronef. Ce système de surveillance (10) comporte au moins une source d'alimentation électrique (2), au moins un calculateur (8) et plusieurs circuits de surveillance (1) de l'état des interrupteurs (6) desdits contacteurs (22). Chaque circuit de surveillance (1) comporte une source d'alimentation électrique (2), un interrupteur (6) de chaque contacteur (22), lesdits interrupteurs (6) d'un contacteur (22) étant liés entre eux, et un ensemble électronique (4) muni de récepteurs (41) agencés en série entre eux. Chaque interrupteur (6) est agencé en parallèle avec au moins un récepteur (41) de sorte à court-circuiter ledit au moins un récepteur (41) lorsque ledit interrupteur (6) est à l'état fermé. Chaque calculateur (8) mesure et analyse une caractéristique électrique dudit ensemble électronique (4), telle une tension électrique de réseau VE aux bornes dudit ensemble électronique (4), afin de déterminer l'état de chaque interrupteur (6).