Abstract: A luminaire has a light emitting portion extending between first second end caps to define a length between the first end cap and the second end cap. The first end cap comprises a receptacle and the second end cap comprises a post both of which extend in an insertion direction. The receptacles are configured to closely receive the posts and the insertion direction is disposed transversely to the length. A method of assembling a luminaire assembly includes positioning a first end cap of a first luminaire over a second end cap of a second luminaire; moving the first end cap relative to the second end cap in the insertion direction; and inserting the post into the receptacle. An electrical connector on the first end cap may connect with a mating electrical connector on the second end cap to complete an electrical connection between the first luminaire and the second luminaire.

Abstract: A power converter may be configured to power multiple output loads, including a main output load and at least one auxiliary output load. The power converter may include control circuitry that controls power delivery to output circuits coupled to the output loads. When the main output load is operating in a reduced power mode, the control circuitry may trigger the switching circuitry to increase the supply of power in order to increase the auxiliary voltages used to power the auxiliary loads if one or more of the auxiliary voltages drops below a threshold due to the main output load operating in the reduced power mode.

Abstract: A luminaire has a light emitting portion extending between first second end caps to define a length between the first end cap and the second end cap. The first end cap comprises a receptacle and the second end cap comprises a post both of which extend in an insertion direction. The receptacles are configured to closely receive the posts and the insertion direction is disposed transversely to the length. A method of assembling a luminaire assembly includes positioning a first end cap of a first luminaire over a second end cap of a second luminaire; moving the first end cap relative to the second end cap in the insertion direction; and inserting the post into the receptacle. An electrical connector on the first end cap may connect with a mating electrical connector on the second end cap to complete an electrical connection between the first luminaire and the second luminaire.

Abstract: A circuit for generating an output current includes a control signal generating circuit that is configured to generate a control signal. The control signal is a function of a level of an analog input voltage signal, and a level of the output current is a function of a level of an analog input current signal and the level of the analog input voltage signal.

Abstract: A level shifting circuit can include a level shifting circuit input node that can be coupled to an input signal, where the input signal can be configured to switch between discrete voltage levels in an input voltage domain. A level shifting circuit output node of the level shifting circuit can be configured to provide shifted voltage levels that are shifted relative to the input signal responsive to switching of the input signal. A constant voltage element can have a first terminal that can be coupled to the level shifting circuit input node and can have a second terminal that can be coupled to the level shifting circuit output node. The constant voltage element can be configured to provide a constant voltage level shift to the input signal to provide the shifted voltage levels responsive to switching of the input signal between the discrete voltage levels in the first voltage domain.

Abstract: A power converter may be configured to power multiple output loads, including a main output load and at least one auxiliary output load. The power converter may include control circuitry that controls power delivery to output circuits coupled to the output loads. When the main output load is operating in a reduced power mode, the control circuitry may trigger the switching circuitry to increase the supply of power in order to increase the auxiliary voltages used to power the auxiliary loads if one or more of the auxiliary voltages drops below a threshold due to the main output load operating in the reduced power mode.

Abstract: A high efficiency driver circuit with fast response is disclosed. Embodiments of the present invention relate to an LED driver that can drive a plural number of LED strings. The driver according to example embodiments includes a voltage converter stage with a feedback loop. The driver can include a speed-up circuit, and/or an adaptive output voltage control circuit, also referred to herein as an overhead control circuit. In at least some embodiments, an input inductor helps to attenuate input current ripple, which could otherwise lead to low high-frequency winding loss in other inductors. The speed-up circuit can provide current regulation of the LED strings and prevent flickering of the LEDs. The overhead control circuit can adjust the output voltage of the driver to an optimum value to improve operating efficiency.

Abstract: A solid state light fixture includes a light emitting diode (LED) load and a driver circuit that selectively provides one of a switched-mode drive current and a linear-mode drive current to the LED load in response to a dimming control signal.

Abstract: A solid state light fixture includes a light emitting diode (LED) load and a driver circuit that selectively provides one of a switched-mode drive current and a linear-mode drive current to the LED load in response to a dimming control signal.

Abstract: Driver circuitry includes power converter circuitry, switching control circuitry, and switching frequency limiting circuitry. The power converter circuitry is configured to receive and selectively provide an input signal to one or more power conversion components via a power converter switching element to produce a regulated output signal. The switching control circuitry is coupled to the power converter switching element and configured to provide a switching control signal for controlling the power converter switching element based on a frequency limited switching trigger signal.

Abstract: A circuit for generating an output current includes a control signal generating circuit that is configured to generate a control signal. The control signal is a function of a level of an analog input voltage signal, and a level of the output current is a function of a level of an analog input current signal and the level of the analog input voltage signal.

Abstract: A circuit for generating an output current includes a control signal generating circuit that is configured to generate a control signal. The control signal is a function of a level of an analog input voltage signal, and a level of the output current is a function of a level of an analog input current signal and the level of the analog input voltage signal.

Abstract: A level shifting circuit can include a level shifting circuit input node that can be coupled to an input signal, where the input signal can be configured to switch between discrete voltage levels in an input voltage domain. A level shifting circuit output node of the level shifting circuit can be configured to provide shifted voltage levels that are shifted relative to the input signal responsive to switching of the input signal. A constant voltage element can have a first terminal that can be coupled to the level shifting circuit input node and can have a second terminal that can be coupled to the level shifting circuit output node. The constant voltage element can be configured to provide a constant voltage level shift to the input signal to provide the shifted voltage levels responsive to switching of the input signal between the discrete voltage levels in the first voltage domain.

Abstract: A power conversion circuit includes a voltage boost circuit including a boost inductor configured to generate an output voltage in response to an input voltage, and a boost controller configured to control operation of the voltage boost circuit. The boost controller is configured to control operation of the voltage boost circuit in response to a level of current in the boost inductor.

Abstract: Driver circuitry includes power converter circuitry, switching control circuitry, and switching frequency limiting circuitry. The power converter circuitry is configured to receive and selectively provide an input signal to one or more power conversion components via a power converter switching element to produce a regulated output signal. The switching control circuitry is coupled to the power converter switching element and configured to provide a switching control signal for controlling the power converter switching element based on a frequency limited switching trigger signal.

Abstract: A power supply circuit includes an input configured to receive an input voltage, an output configured to supply an output voltage, at least one inductor, at least one diode, and at least one switch. The inductor may have a parasitic capacitance less than about 100 pF. Related inductors are also disclosed.

Abstract: A SEPIC driver circuit with low input current ripple is disclosed. Embodiments of the present invention provide a driver circuit that accommodates universal input, has a wide output voltage range and good efficiency. An LED lighting system using such as circuit is also disclosed. In at least some embodiments, the circuit is configured as a single-ended primary inductor converter circuit using a magnetic element, and a floating capacitor is connected between the input winding and the output winding of the magnetic element. In some embodiments, an inductor is also included at the DC input to the circuit. An output rectifier such as a diode can also be connected to the output winding of the magnetic element, and an output capacitor can be connected across the output of the circuit. An FET, a bipolar transistor, or a plurality of FETs can be used as the switching device.

Abstract: A SEPIC driver circuit with low input current ripple is disclosed. Embodiments of the present invention provide a driver circuit that accommodates universal input, has a wide output voltage range and good efficiency. An LED lighting system using such as circuit is also disclosed. In at least some embodiments, the circuit is configured as a single-ended primary inductor converter circuit using a magnetic element, and a floating capacitor is connected between the input winding and the output winding of the magnetic element. In some embodiments, an inductor is also included at the DC input to the circuit. An output rectifier such as a diode can also be connected to the output winding of the magnetic element, and an output capacitor can be connected across the output of the circuit. An FET, a bipolar transistor, or a plurality of FETs can be used as the switching device.

Abstract: A high efficiency driver circuit with fast response is disclosed. Embodiments of the present invention relate to an LED driver that can drive a plural number of LED strings. The driver according to example embodiments includes a voltage converter stage with a feedback loop. The driver can include a speed-up circuit, and/or an adaptive output voltage control circuit, also referred to herein as an overhead control circuit. In at least some embodiments, an input inductor helps to attenuate input current ripple, which could otherwise lead to low high-frequency winding loss in other inductors. The speed-up circuit can provide current regulation of the LED strings and prevent flickering of the LEDs. The overhead control circuit can adjust the output voltage of the driver to an optimum value to improve operating efficiency.

Abstract: Systems and methods are provided for managing switching operation of a power converter, for example and without limitation, for powering LEDs in an efficient manner. According to one aspect, a system for managing a switching operation of a power converter includes an off time control system for managing operation modes of a power converter. The off time control system includes an active device for transmitting a bias signal, where the bias signal is configured for modulating a zero diode current signal for controlling a trigger signal, and a resistive body for discharging the bias signal.