A wireless communications unit is provided, such as a portable unit to serve as an access point and/or a repeater node in a wireless meshing network, including at least two removable power source modules engageable with and electrically connectable to the unit to provide electrical power thereto, and a mechanism to allow selective disconnection and removal of one power source module from the unit while maintaining connection and retention to the unit of another power source module. The mechanism comprises a rotatable wheel having a radially projecting portion (such as a cam lobe). When the wheel is rotated the projecting portion bears against a part of the first power source module to push it into an ejected position while electrically disconnecting it from the unit, to allow removal and recharge/replacement.
H01M 10/48 - Accumulateurs combinés à des dispositions pour mesurer, tester ou indiquer l'état des éléments, p. ex. le niveau ou la densité de l'électrolyte
A wireless communications unit is provided, such as a portable unit to serve as an access point and/or a repeater node in a wireless meshing network, including at least two removable power source modules engageable with and electrically connectable to the unit to provide electrical power thereto, and a mechanism to allow selective disconnection and removal of one power source module from the unit while maintaining connection and retention to the unit of another power source module. The mechanism comprises a rotatable wheel having a radially projecting portion (such as a cam lobe). When the wheel is rotated the projecting portion bears against a part of the first power source module to push it into an ejected position while electrically disconnecting it from the unit, to allow removal and recharge/replacement.
A wireless communications unit is provided, such as a portable unit to serve as an access point and/or a repeater node in a wireless meshing network, including at least two removable power source modules engageable with and electrically connectable to the unit to provide electrical power thereto, and a mechanism to allow selective disconnection and removal of one power source module from the unit while maintaining connection and retention to the unit of another power source module. The mechanism comprises a rotatable wheel having a radially projecting portion (such as a cam lobe). When the wheel is rotated the projecting portion bears against a part of the first power source module to push it into an ejected position while electrically disconnecting it from the unit, to allow removal and recharge/replacement.
The invention generally relates to a field regulator, particularly a field regulator for a resonant circuit, a transmitter including such a field regulator, a proximity detection system including such a transmitter, and a method of regulating a resonant circuit. In one aspect the invention provides a field regulator for a resonant circuit, the resonant circuit including an inductor coil around a core, the field regulator including a DC bias circuit configured to apply a DC bias current to the inductor coil for regulating an electromagnetic field generated by the inductor. The DC bias circuit can be used to selectively change the inductance of the inductor in the resonant circuit so as to maintain a consistent field strength in a changing environment, particularly to take into account the presence of large metal bodies which might otherwise adversely impact on operation. In particular, the DC bias current may be used to selectively change the natural frequency of the resonant circuit so as to shift the resonant circuit towards a desired resonance point.
H03K 17/95 - Commutateurs de proximité utilisant un détecteur magnétique
G01D 5/20 - Moyens mécaniques pour le transfert de la grandeur de sortie d'un organe sensibleMoyens pour convertir la grandeur de sortie d'un organe sensible en une autre variable, lorsque la forme ou la nature de l'organe sensible n'imposent pas un moyen de conversion déterminéTransducteurs non spécialement adaptés à une variable particulière utilisant des moyens électriques ou magnétiques influençant la valeur d'un courant ou d'une tension en faisant varier l'inductance, p. ex. une armature mobile
H03K 3/017 - Réglage de la largeur ou du rapport durée période des impulsions
H01F 21/08 - Inductances ou transformateurs variables du type pour signaux continûment variables, p. ex. variomètres par variation de la perméabilité du noyau, p. ex. par variation de la polarisation magnétique
H02M 7/5387 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant alternatif sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs, p. ex. onduleurs à impulsions à un seul commutateur dans une configuration en pont
H02M 7/48 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant alternatif sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande
The invention generally relates to a field regulator, particularly a field regulator for a resonant circuit, a transmitter including such a field regulator, a proximity detection system including such a transmitter, and a method of regulating a resonant circuit. In one aspect the invention provides a field regulator for a resonant circuit, the resonant circuit including an inductor coil around a core, the field regulator including a DC bias circuit configured to apply a DC bias current to the inductor coil for regulating an electromagnetic field generated by the inductor. The DC bias circuit can be used to selectively change the inductance of the inductor in the resonant circuit so as to maintain a consistent field strength in a changing environment, particularly to take into account the presence of large metal bodies which might otherwise adversely impact on operation. In particular, the DC bias current may be used to selectively change the natural frequency of the resonant circuit so as to shift the resonant circuit towards a desired resonance point.
H01F 21/08 - Inductances ou transformateurs variables du type pour signaux continûment variables, p. ex. variomètres par variation de la perméabilité du noyau, p. ex. par variation de la polarisation magnétique
H01F 27/42 - Circuits spécialement adaptés à la modification ou la compensation des caractéristiques électriques des transformateurs, réactances ou bobines d'arrêt
The invention generally relates to a field regulator, particularly a field regulator for a resonant circuit, a transmitter including such a field regulator, a proximity detection system including such a transmitter, and a method of regulating a resonant circuit. In one aspect the invention provides a field regulator for a resonant circuit, the resonant circuit including an inductor coil around a core, the field regulator including a DC bias circuit configured to apply a DC bias current to the inductor coil for regulating an electromagnetic field generated by the inductor. The DC bias circuit can be used to selectively change the inductance of the inductor in the resonant circuit so as to maintain a consistent field strength in a changing environment, particularly to take into account the presence of large metal bodies which might otherwise adversely impact on operation. In particular, the DC bias current may be used to selectively change the natural frequency of the resonant circuit so as to shift the resonant circuit towards a desired resonance point.
H01F 21/08 - Inductances ou transformateurs variables du type pour signaux continûment variables, p. ex. variomètres par variation de la perméabilité du noyau, p. ex. par variation de la polarisation magnétique
H01F 27/42 - Circuits spécialement adaptés à la modification ou la compensation des caractéristiques électriques des transformateurs, réactances ou bobines d'arrêt
H04B 5/00 - Systèmes de transmission en champ proche, p. ex. systèmes à transmission capacitive ou inductive
7.
AN INDUCTOR, A RELATED METHOD OF MANUFACTURE, A TRANSMITTER INCLUDING SAID INDUCTOR, AND A RELATED PROXIMITY DETECTION SYSTEM
The invention relates to an inductor, and particularly to an inductor for a transmitter circuit. The invention also concerns a transmitter including said inductor, a proximity detection system employing such a transmitter, and a method of making said inductor. The inductor of the invention includes a core having non-uniform permeability and a conductor winding arranged around the core. When used in a transmitter circuit, this allows an induced electromagnetic field to propagate through the core in a more efficient manner than otherwise possible, so resulting in a higher dynamic field strength for a given resonant circuit drive.
H01F 21/08 - Inductances ou transformateurs variables du type pour signaux continûment variables, p. ex. variomètres par variation de la perméabilité du noyau, p. ex. par variation de la polarisation magnétique
8.
AN INDUCTOR, A RELATED METHOD OF MANUFACTURE, A TRANSMITTER INCLUDING SAID INDUCTOR, AND A RELATED PROXIMITY DETECTION SYSTEM
The invention relates to an inductor, and particularly to an inductor for a transmitter circuit. The invention also concerns a transmitter including said inductor, a proximity detection system employing such a transmitter, and a method of making said inductor. The inductor of the invention includes a core having non-uniform permeability and a conductor winding arranged around the core. When used in a transmitter circuit, this allows an induced electromagnetic field to propagate through the core in a more efficient manner than otherwise possible, so resulting in a higher dynamic field strength for a given resonant circuit drive.
H01F 21/08 - Inductances ou transformateurs variables du type pour signaux continûment variables, p. ex. variomètres par variation de la perméabilité du noyau, p. ex. par variation de la polarisation magnétique
The present invention concerns a network node comprising: first and second modems and a digital switch having one or more ports for attaching peripheral devices, the switch being interposed between the first and second modems, first and second cables being' respectively connectable to the first and second modems, wherein the network node is operable as a point-to-point link Further, the invention concerns a network of such nodes, connected by cables to form a series of point -to "point links. The invention allows a new, cable-based network topology of point-to-point links, which finds particular application in environments such as underground mines, subways and tunnels.
