Patent application number | Description | Published |
20130127353 | Driving Circuits for Solid-State Lighting Apparatus With High Voltage LED Components and Related Methods - A driving circuit for a solid state lighting apparatus includes a full wave rectifier configured to rectify an alternating current (AC) input voltage signal to generate a rectified input signal, a boost conversion circuit configured to receive the rectified input signal and responsively generate a direct current (DC) output voltage signal and to supply the output voltage signal to a solid state light source, and a boost control circuit coupled to the boost conversion circuit and configured to cause the boost conversion circuit to operate in a constant power mode. | 05-23-2013 |
20130293135 | DRIVER CIRCUITS FOR DIMMABLE SOLID STATE LIGHTING APPARATUS - A voltage regulator for generating a housekeeping voltage in a high voltage power supply circuit includes a charging switch coupled to a high voltage node and to a storage device at an output node, and a control voltage regulation circuit coupled to the charging switch and configured to cause the charging switch to generate a current pulse for charging the storage device. | 11-07-2013 |
20140117964 | Dual Mode Power Supply Controller with Charge Balance Multipliers and Charge Balance Multiplier Circuits - 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. | 05-01-2014 |
20140119078 | Dual Mode Power Supply Controller with Current Regulation - 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. | 05-01-2014 |
20140218987 | POWER SUPPLY WITH LOW ELECTRO-MAGNETIC INTERFERENCE AND INDUCTOR FOR POWER SUPPLY WITH LOW ELECTRO-MAGNETIC INTERFERENCE - 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. | 08-07-2014 |
20140265885 | MULTIPLE POWER OUTPUTS GENERATED FROM A SINGLE CURRENT SOURCE - A system includes a power converter that is configured to supply current to a plurality of output loads connected in series. At least one of the output loads is connected in parallel with a switch that switches in accordance with a duty cycle. The duty cycle may be set in accordance with a predetermined current ratio of average current flow through the output loads. | 09-18-2014 |
20150123565 | MINIMUM OFF TIME CONTROL SYSTEMS AND METHODS FOR SWITCHING POWER CONVERTERS IN DISCONTINUOUS CONDUCTION MODE - 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. | 05-07-2015 |
20150312974 | SEPIC DRIVER CIRCUIT WITH LOW INPUT CURRENT RIPPLE - 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. | 10-29-2015 |
20150312983 | HIGH EFFICIENCY DRIVER CIRCUIT WITH FAST RESPONSE - 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. | 10-29-2015 |