Abstract: A switching power converter is provided that uses at least two peak current thresholds. In particular, the switching power converter clamps a desired peak current to not fall below a low peak current threshold value while a rectified input voltage is decreasing and to not fall below a high peak current threshold value subsequent to zero crossing times for an AC input voltage.

Abstract: A single configuration terminal of a device is used to configure multiple operating parameters of the device based on a resistor and a capacitor selectively connected to the configuration terminal. The device includes a detection circuit configured to monitor a voltage signal at the configuration terminal to determine multiple values in response to a regulated current source providing a current to the configuration terminal selectively connected to the resistor and the capacitor in parallel, and configure multiple operating parameters based on the determined values. A method for configuring operating parameters using a single configuration terminal of a device includes providing a current to the configuration terminal selectively connected to a resistor and a capacitor in parallel, monitoring a voltage signal at the configuration terminal, determining multiple values based on the monitoring, and configuring multiple operating parameter based on the determined values.

Abstract: Provided are a terminal and a terminal call soft switching method. The method includes the following steps: when a terminal sends an INVITE message to a first server to which the terminal is registered at current but receives no response, the terminal retransmits the INVITE message to the first server according to a retransmission interval; when a number of retransmission times for the INVITE message is greater than a preset value and no response has been received from the first server, the terminal sends a register message to a second server; and after the terminal is registered to the second server, the terminal sends the INVITE message to the second server.

Abstract: Embodiments of the present disclosure disclose a service processing method, a PCRF, and a system.

Abstract: A service processing method and device, and a home gateway are provided. A dialing message sent by a terminal is received. It is judged whether the dialing message is a message for processing a predetermined service. When a judgment result is that the dialing message is the message for processing the predetermined service, the predetermined service is processed.

Abstract: A multi-mode control scheme for an LED lamp system uses the detected firing angle of an AC input voltage waveform to select from multiple regulation modes. In operation, a current controller compares the detected firing angle to one or more specified thresholds and selects the appropriate regulation scheme based on the comparison result. When the detected firing angle is less than a first firing angle threshold, the controller employs a current shaping regulation mode. When the detected firing angle is greater than a second firing angle threshold, the controller employs a switching cycle-I_Peak modulation regulation mode. And when the detected firing angle is greater than the first firing angle threshold and less than the second firing angle threshold, the controller employs a hybrid regulation mode.

Abstract: A system and method for controlling a light output from a LED-based lighting solution is provided that may receive phase-cut AC signals and/or external digital control signals. The invention is capable of receiving both a phase-cut AC signal and an external digital control signal simultaneously and providing a desired light output from a LED-based lighting solution. The system generally includes a power source electronically connected to one or more dimmers and an AC power output of the dimmer connected to a solid state lighting device such as an LED. The system is capable of receiving signals from a wired and/or wireless external digital control device to additionally control the desired light output from a LED-based lighting solution.

Abstract: The present document relates to driver circuits and/or power converters, e.g. for Solid State Lighting (SSL) devices, such as Light Emitting Diodes (LEDs). A controller for a driver circuit which is configured to provide a drive voltage to a load subject to an input voltage is described. The driver circuit comprises a power converter network and a power transistor. The controller comprises a control transistor which is configured to couple or to decouple a low voltage terminal of the power transistor to or from a low voltage potential, to put the power transistor to a conduction-state or an off-state, respectively. Furthermore, the controller comprises a charging transistor, arranged in parallel to the control transistor, and configured to couple or to decouple the low voltage terminal of the power transistor to a supply voltage capacitor, to put the power transistor to the conduction-state or off-state, respectively.

Abstract: Intelligent control of a solid state lamp when coupled to a trailing edge phase cut dimmer switch is provided. On and off cycles of the lamp's power stage switch are enabled during a period when the energy in the bulk capacitor is at its highest levels. During this period a bleeder circuit does not have to be enabled, which results in a greater operational efficiency as compared with normal switching schemes for trailing edge dimmers.

Abstract: An adaptive switch mode LED driver provides an intelligent approach to driving multiple strings of LEDs. The LED driver determines an optimal current level for each LED channel from a limited set of allowed currents. The LDO driver then determines a PWM duty cycle for driving the LEDs in each LED channel to provide precise brightness control over the LED channels. Beneficially, the LED driver minimizes the power dissipation in the LDO circuits driving each LED string, while also ensuring that the currents in each LED string are maintained within a limited range. A sample and hold LDO allows PWM control over extreme duty cycles with very fast dynamic response. Furthermore, fault protection circuitry ensures fault-free startup and operation of the LED driver.

Abstract: A switching power converter includes a controller configured to transition from a first operating mode to a second operating mode by determining the operating conditions at the transition point between the operation modes. The controller uses a point where a switch included in the power converter would have been turned on if operating under the first operating mode as a reference point to determine when to turn on the switch under the second operating mode. Using the reference point, the switching power converter determines a control period for regulating the switching period of the switch in a second operating mode.

Abstract: LED lamp systems as described herein include a dimmer switch and a bleeder circuit. The bleeder circuit provides a bleeder current to management voltage and to prevent the dimmer switch from turning off prematurely. The bleeder circuit may monitor the AC input voltage outputted by the dimmer switch. When the AC input voltage is less than a first threshold, the bleeder circuit provides a bleeder current. When the AC input voltage is greater than a second threshold, the bleeder circuit adjusts the bleeder current to less than a predetermined level.

Abstract: Intelligent control of a solid state lamp when coupled to a trailing edge phase cut dimmer switch is provided. On and off cycles of the lamp's power stage switch are enabled during a period when the energy in the bulk capacitor is at its highest levels. During this period a bleeder circuit does not have to be enabled, which results in a greater operational efficiency as compared with normal switching schemes for trailing edge dimmers.

Abstract: LED lamp systems as described herein include a dimmer switch and a bleeder circuit. The bleeder circuit provides a bleeder current to management voltage and to prevent the dimmer switch from turning off prematurely. The bleeder circuit may monitor the AC input voltage outputted by the dimmer switch. When the AC input voltage is less than a first threshold, the bleeder circuit provides a bleeder current. When the AC input voltage is greater than a second threshold, the bleeder circuit adjusts the bleeder current to less than a predetermined level.

Abstract: A power supply detection system and method for determining the AC mains voltage range when a device (e.g., LED based bulbs) is indirectly connected to the AC mains and the device does not receive the complete sinusoidal AC mains signal.

Abstract: A TRIAC dimmer controller for an LED lamp dynamically adjusts the amount of additional current supplied to the TRIAC dimmer based on the TRIAC dimmer operating mode. A TRIAC dimmer current controller continually senses the TRIAC dimmer current loading and determines a TRIAC dimmer operating mode based on the detected current. The TRIAC dimmer controller compares the detected current with a threshold current value called a TRIAC holding current, and adjusts the amount of bleeder current based on the difference between the detected current and the threshold current value. By continually sensing the TRIAC dimmer current loading, the LED controller regulates the amount of bleeder current supplied to the TRIAC dimmer using a single sink current path to satisfy the TRIAC dimmer current demands of multiple TRIAC dimmer operating modes.

Abstract: An LED controller reduces jitter of an LED lamp. In one embodiment, the LED controller includes a jitter detection circuit adapted to determine an amount of jitter in an input voltage signal. The input voltage signal includes a plurality of cycles and indicates an amount of dimming for the LED lamp. The LED controller further includes a jitter compensation circuit, which generates a control signal to control regulated in the LED lamp such that an output light intensity of the LED lamp substantially corresponds to the amount of dimming for the LED lamp. The control signal controls current delivery to the LED lamp to compensate for the determined amount of jitter in the input voltage signal.

Abstract: A method and server for recommending information to a group is provided, the method comprising obtaining a characteristic vector for each of a plurality of information items to be recommended to the group, wherein the characteristic vector comprises at least one characteristic; obtaining interest characteristics of a plurality of external users not in the group and having one-way correlation relationship with the group; and filtering the information items based on the interest characteristics of the external users, and recommending the retained information items to the group. The characteristics of external users outside the group are used to select information items to be recommended to the group, which enhances the efficacy of information recommendation.