Abstract: The present disclosure relates to a central negative pressure arc welding apparatus and method. Through a pumping gas pipeline from the suction device to hollow tubular electrode, a suction device may establish a stable, high energy density and binding arc beneath hollow tubular electrode. The binding degree, energy density and voltage of arc may be adjusted by changing the value of negative pressure in the center of arc. Accordingly, welding heat input and coefficient of weld may be precisely controlled. This apparatus may further set up central pulsating negative pressure arc by turning on valve periodically to make a periodic negative pressure in the center of arc. This present disclosure both possesses good stability and adaptability of traditional Gas Tungsten Arc Welding and achieves binding arc and good penetration of Plasma Arc Welding. Furthermore, this present disclosure improves the mechanical properties of welded joints.

Abstract: The present disclosure relates to an LED driving circuit and method using a single inductor. A constant current controller controls a power stage circuit to provide a constant output signal, and thus to provide a constant current signal for an LED load. A dimming controller regulates luminance of the LED load. A constant voltage generating circuit receives the current signal at an output terminal of the power stage circuit and a reserve supply voltage for providing a supply voltage for the dimming controller. Compared with the prior art, the present disclosure does not need an independent power supply chip, and reduces components such as inductors and rectifying transistors. Thus, a peripheral circuit is simplified, and an overall size of the system is reduced.

Abstract: The present disclosure relates to LED driving circuit and method using a single inductor. A constant current controller controls a power stage circuit to provide a constant output signal, and thus to provide a constant current signal for an LED load. A dimming controller regulates luminance of the LED load. A constant voltage generating circuit receives the current signal at an output terminal of the power stage circuit and a reserve supply voltage for providing a supply voltage for the dimming controller. Compared with the prior art, the present disclosure does not need an independent power supply chip, and reduces components such as inductors and rectifying transistors. Thus, a peripheral circuit is simplified, and an overall size of the system is reduced.

Abstract: A multichannel constant current LED controlling circuit can include: (i) a control loop configured to generate a first control signal in accordance with a current feedback signal that represents a driving current flowing through an LED load, where the LED load comprises a plurality of LED strings coupled in series; (ii) a loop steady state network comprising a plurality of steady state holding components configured to hold a plurality of steady state control signals that correspond to a plurality of load states of the LED load, where when a state of the LED load varies, at least one of the steady state holding components is selected by the control loop to generate the first control signal; and (iii) a power switching transistor of a power stage circuit configured to generate a pseudo-constant output current to drive the LED load.

Abstract: A multichannel constant current LED driving circuit can include: (i) a power stage circuit having a power switching transistor, an inductor, and a rectifier circuit, where the power stage circuit is configured to receive a DC bus voltage, and to generate a pseudo-constant output signal to drive a plurality of LED strings; (ii) a current control unit configured to control an average current of each of the plurality of LED strings in accordance with a corresponding one of a plurality of dimming signals; and (iii) the current control unit being configured to control the power switching transistor in accordance with a current feedback signal that represents a current flowing through the LED strings, where the plurality of LED strings are coupled in series to receive the pseudo-constant output signal.

Abstract: Traffic control techniques are provided for intercepting an initial message in a handshaking procedure for a secure communication between a first device and a second device at a proxy device. Identification information associated with the second device is extracted from the initial message. A policy is applied to communications between the first device and second device based on the identification information.

Abstract: System, apparatus, and methods for authenticating a device for access to a server. The method includes receiving a set of device-specific attributes from the device as a part of a device registration process, storing the set of device-specific attributes in a device attribute storage, and receiving a request to perform an operation using the device and involving the server. The method further includes transmitting a set of device-specific challenge questions derived from the set of device-specific attributes to the device, receiving responses to the set of device-specific challenge questions from the device, confirming that the responses each conform to the set of device-specific attributes, and enabling the operation involving the server.

Abstract: Systems and methods for a device connected to a private network to efficiently retrieve a software/firmware update. The device may retrieve an update scheme that defines an external Uniform Resource Identifier (URI) for a resource external to the private network and a primary URI for a primary resource connected to the private network. The device may compare own Internet Protocol address and the primary URI to determine whether or not the device is the primary resource. When the device is the primary resource, the device may retrieve the software/firmware update from the external URI.

Abstract: Systems, methods, and servers for providing services to a device are described. A device connected to a network is configured to transmit, via the network, a request for a service in accordance with a first communications schedule. The device may receive, via the network, a modified communications schedule. The device may re-transmit, via the network, the request for the service in accordance with the modified communications schedule.

Abstract: In one embodiment, two way communication between an IP phone behind a firewall and an IP phone behind a translation device is established. A network security device receives a remote packet from the translation device. The header of the remote packet includes the address of the translation device, and a payload of the remote packet includes an embedded remote address and the media port of the IP phone behind the translation device. A memory stores the media port matched with the address of the translation device. When the network security device receives a local packet from the IP phone behind the firewall destined for the IP phone behind the translation device, a controller rewrites the destination port of the local packet with the media port.

Abstract: In one embodiment, a control circuit configured to control a power stage circuit of a primary-controlled flyback converter, can include: (i) a current sense circuit that generates a current sense signal by sampling a primary current; (ii) a voltage sense circuit that generates a voltage sense signal by sampling an auxiliary voltage after a blanking time has elapsed; (iii) a control signal generator that generates a switch control signal according to the voltage sense signal and the current sense signal; and (iv) the switch control signal being configured to control a power switch of the power stage circuit, where the switch control signal is active during a constant on time.

Abstract: Techniques are presented for seamless engagement and disengagement of Transport Layer Security proxy services. A first initial message of a handshaking procedure for a first secure communication session between a first device and a second device is intercepted at a proxy device. The first initial message of the handshaking procedure is saved at the proxy device. A second initial message of a second handshaking procedure for a second secure communication session between the proxy device and the second device is sent from the proxy device to the second device. It is determined from the second handshaking procedure that inspection of the first secure communication session is not to be performed by the proxy device. The first secure communication session is established without examination of the communication traffic by the proxy device.

Abstract: Apparatus, methods, and other embodiments associated with securing and authenticating multiple devices behind a network address translation (NAT) device are described. One example method includes controlling a phone proxy to provide security credential information to an Internet Protocol (IP) phone located behind the NAT device. The credentials may be selectively provided in response to receiving a certificate request from the IP phone. The certificate request includes IP phone identifying addresses. The method may also include controlling the phone proxy to update an entry in a secure IP phone data store to relate together the IP phone identifying addresses, a source port associated with the IP phone, and the fact that credential information was provided to the IP phone. This entry can mark the IP phone as an authorized phone. The entry may be addressable as a function of a least a portion of the IP phone identifying addresses.

Abstract: Techniques are presented for seamless engagement and disengagement of Transport Layer Security proxy services. A first initial message of a handshaking procedure for a first secure communication session between a first device and a second device is intercepted at a proxy device. The first initial message of the handshaking procedure is saved at the proxy device. A second initial message of a second handshaking procedure for a second secure communication session between the proxy device and the second device is sent from the proxy device to the second device. It is determined from the second handshaking procedure that inspection of the first secure communication session is not to be performed by the proxy device. The first secure communication session is established without examination of the communication traffic by the proxy device.

Abstract: An electrical connector having a body having a shoulder receiving recess formed in a terminal end wall, and a plurality of contacts positioned in the body. Each contact has a pin projecting from a terminal end of the body. Each pin has a base with a pair of protruding shoulders.

Abstract: Traffic control techniques are provided for intercepting an initial message in a handshaking procedure for a secure communication between a first device and a second device at a proxy device. Identification information associated with the second device is extracted from the initial message. A policy is applied to communications between the first device and second device based on the identification information.

Abstract: In one embodiment, a proxy device located between a first device and a second device intercepts a security session request for a security session between the first device and the second device. The proxy device obtains security information from the first device that includes at least a subject name of the first device. The proxy device creates a dynamic certificate using the subject name of the first device and a trusted proxy certificate of the proxy device. The proxy device establishes a security session between the proxy device and the second device using the dynamic certificate. Further, the proxy device establishes a security session between the first device and the proxy device using the trusted proxy certificate of the proxy device. The two security sessions collectively operate as a security session between the first device and the second device.

Abstract: The subject application is directed to coordinating document processing operations among devices having differing functionality. A document is received into a first document processing device that has a first set of processing functions. A display is generated on the first device that includes indicia of an available document processing operation having a function of a first set and a secondary function of a second device, with any secondary function outside the first set. Selection data is received of an operation having functions from the first set and one or more secondary functions. Operation of the first device is controlled by a controller operable to control the functions of the first set by the first device on the document. The document is communicated to the second device following completion of any first set functions. The document processing operation is completed by the second device via completion of any secondary functions.

Abstract: A card connector includes a body, a first contact, and a second contact. The body includes an electrical card receiving groove with an upper sidewall and a lower sidewall. The upper sidewall includes a first contact slot, while the lower sidewall includes a second contact slot. The first contact is positioned in the first contact slot and includes a first securing portion secured to the body, a first elastic portion extending from the first securing portion, and a first contact portion positioned at an end of the first elastic portion. The second contact is positioned in the second contact slot and includes a second securing portion secured in the second contact slot, a second elastic portion extending from the second securing portion, and a second contact portion positioned at an end of the second elastic portion and extending away from the second securing portion and the second elastic portion.

Abstract: In one embodiment, a proxy device located between a first device and a second device intercepts a security session request for a security session between the first device and the second device. The proxy device obtains security information from the first device that includes at least a subject name of the first device. The proxy device creates a dynamic certificate using the subject name of the first device and a trusted proxy certificate of the proxy device. The proxy device establishes a security session between the proxy device and the second device using the dynamic certificate. Further, the proxy device establishes a security session between the first device and the proxy device using the trusted proxy certificate of the proxy device. The two security sessions collectively operate as a security session between the first device and the second device.