Abstract: Described herein are systems and methods for generating short load current pulses using an H-bridge. In various embodiments, this is accomplished by controlling, in a shunting mode, a low-side switch of the H-bridge to drive a first average current and controlling, in a non-shunting mode, a high-side switch of the H-bridge to drive a second average current such that the first and second average currents are substantially the same and reduce a current pulse width of the load current.

Abstract: Presented are systems and methods for controlling a compensation circuit. In embodiments, a detection circuit receives a set of control signals that have been generated by a control circuit to drive a set of light emitting diode (LED) switches. The switches control a set of LEDs driven by a DC-DC converter that is coupled to a feedback loop to which the compensation circuit is removably coupled. In embodiments, the detection circuit determines whether the status of an LED is about to change and, in response, uses the compensation circuit to control the feedback loop in a manner such as to reduce a current overshoot or current undershoot in the LED current.

Abstract: Presented are systems and methods for improving transient response in buck-boost circuits avoid circuit instabilities in both boost mode and buck mode. In embodiments, this is accomplished when, in response to determining that the circuit operates in buck mode, a compensation circuit is adjusted to operate at a first bandwidth. In response to determining that the circuit operates in boost mode, the compensation circuit may then be adjusted to decrease a boost mode crossover frequency and operate at a second, lower bandwidth.

Abstract: Presented are average current mode control systems and methods for driving a load with a constant current. In embodiments, this is accomplished when, in response to a zero-current detection circuit detecting a zero current condition in the load current, a compensation circuit is disconnected from a first error amplifier to enable that error amplifier to provide a first voltage to a second error amplifier. The second error amplifier increases a charging current in a capacitor to reduce a dead time in the load current. Similarly, in response to an overcurrent detection circuit detecting an overcurrent condition in the load current, the compensation circuit is disconnected from the first error amplifier to enable the first error amplifier to provide a second voltage to the second error amplifier to decrease the charging current and reduce an overshoot condition.

Abstract: To generate sequential addresses when multiple integrated circuit (IC) devices are accessing the same memory, an address token is sent along the IC devices communicatively coupled in a ring topology. The address token is first transferred along the ring topology during a memory reservation phase in which each IC device can set a corresponding memory request bit to indicate that the IC device has data to write to the memory. The modified address token is then transferred along the ring topology again during a memory access phase. During the memory access phase, each IC device that has data to write can perform a memory write operation using a sequential address determined from the contents of the address token.

Abstract: To generate sequential addresses when multiple integrated circuit (IC) devices are accessing a memory region, an address token is sent along the IC devices communicatively coupled in a ring topology. The address token includes a data increment value for the memory region. When a device receives the address token, a memory write address is determined based on the data increment value and a base address corresponding to the memory region for the current write cycle. The IC device can perform a write operation using the memory write address if the device has data to write. The data increment value of the address token is then updated based on the number of data units being written in the current write cycle to the memory region by the IC device, and the updated address token is transmitted to the next IC device of the ring topology.

Abstract: The present disclosure relates generally to systems and methods for transient response improvements in electrical circuits. More particularly, the present disclosure relates to systems and methods for suppressing overshoot currents and overshoot durations in circuits using switching regulators, such as driver circuits for LED applications. Embodiments of the invention relate to an LED driver that utilizes transient suppression systems and method for LED applications.

Abstract: Described are light emitting diode (LED) and non-LED driver systems and methods that reduce current overshoot and, deadtime, and other undesirable effects in applications such as adaptive driving beam headlamp application that negatively impact circuit parameters, including efficiency. In certain embodiments, this is accomplished by using a current clamp circuit that is controlled such as to limit an overshoot in load current, e.g., when a number of LEDs that are turned on changes.

Abstract: Described herein are systems and methods for operating DC-DC regulators such as LED drivers. Various embodiments herein allow a DC-DC regulator to switch between buck mode and buck-boost mode without suffering effects otherwise resulting from transient currents when switching between modes. In certain embodiments, this is accomplished by operating the DC-DC regulator in a buck-boost mode to charge a boost capacitor with a substantially constant inductor current. The inductor current is also used to control a set of switches to operate the DC-DC regulator in a buck mode to drive a load by using the capacitor as a power source.

Abstract: Described herein are systems and methods for generating short load current pulses using an H-bridge. In various embodiments, this is accomplished by controlling, in a shunting mode, a low-side switch of the H-bridge to drive a first average current and controlling, in a non-shunting mode, a high-side switch of the H-bridge to drive a second average current such that the first and second average currents are substantially the same and reduce a current pulse width of the load current.

Abstract: Described herein are systems and methods for operating DC-DC regulators such as LED drivers. Various embodiments herein allow a DC-DC regulator to switch between buck mode and buck-boost mode without suffering effects otherwise resulting from transient currents when switching between modes. In certain embodiments, this is accomplished by operating the DC-DC regulator in a buck-boost mode to charge a boost capacitor with a substantially constant inductor current. The inductor current is also used to control a set of switches to operate the DC-DC regulator in a buck mode to drive a load by using the capacitor as a power source.

Abstract: The present disclosure relates generally to systems and methods for transient response improvements in electrical circuits. More particularly, the present disclosure relates to systems and methods for suppressing overshoot currents and overshoot durations in circuits using switching regulators, such as driver circuits for LED applications. Embodiments of the invention relate to an LED driver that utilizes transient suppression systems and method for LED applications.

Abstract: Described herein are embodiments for systems and methods LED driver. In one or more embodiments, the LED driver may operate in a boost mode to charge a capacitor using a power source or in a boost mode to use the charged capacitor to provide current to a load, such as an LED string. In one or more embodiments, the LED driver uses a single inductor for boost mode operation or buck mode operation. Such embodiments simplify the LED driver and therefore provide an economic advantage. In one or more embodiments, the power source is disconnected in the buck mode, such that the capacitor may be discharged to a low voltage. Therefore, the capacitor may need smaller capacitance to deliver the same discharge energy which otherwise requires a capacitor with larger capacitance.

Abstract: A new architecture for buck LED drivers and buck DC-DC converters is disclosed for providing response to both line and loads. The architecture uses a new average current mode control scheme that does not use an error amplifier to regulate the current in the inductor in the buck converter. Even though there is no oscillator the switching frequency remains constant over line and load. The architecture provides a low cost solution with very fast response times.

Abstract: Described herein are embodiments for systems and methods LED driver. In one or more embodiments, the LED driver may operate in a boost mode to charge a capacitor using a power source or in a boost mode to use the charged capacitor to provide current to a load, such as an LED string. In one or more embodiments, the LED driver uses a single inductor for boost mode operation or buck mode operation. Such embodiments simplify the LED driver and therefore provide an economic advantage. In one or more embodiments, the power source is disconnected in the buck mode, such that the capacitor may be discharged to a low voltage. Therefore, the capacitor may need smaller capacitance to deliver the same discharge energy which otherwise requires a capacitor with larger capacitance.

Abstract: An apparatus and method provides a driver circuit that provides for power factor correction (PFC) to a load, such as a solid-state lighting (SSL) device, such as, for example, a light emitting diode (LED) or an array or cluster of LEDs. A programmable reference is provided in the circuit to operate in a fixed frequency peak current mode control (FFPCMC) or in a fixed frequency average current mode control (FFACMC). A driver circuit is employed to operate the SSL device using power derived from a main power source which may be DC or AC. In a FFPCMC embodiment, a programmable power reference is programmed to be a fixed DC voltage. In a FFACMC embodiment, source input current to the circuit can be programmed to be proportional to the rectified AC voltage after a bridge rectifier.

Abstract: A system includes a driver circuit, a modulator circuit, and a reset circuit. The driver circuit drives a plurality of light emitting diodes via a switch. The switch is controlled by a first signal having a first frequency. The driver circuit controls brightness of the light emitting diodes based on a second signal including a plurality of pulses. The modulator circuit modulates the first signal using a direct sequence spread spectrum modulation. The direct sequence spread spectrum modulation uses a sequence generated based on the first signal. The reset circuit resets the modulator circuit at each of the plurality of pulses of the second signal. The modulator circuit repeats the sequence at each of the plurality of pulses of the second signal.

Abstract: Various embodiments of the invention allow LED lamp fixtures to pass EMI testing irrespective of whether the lamp fixture is operated by a magnetic transformer or an electric transformer without causing input current waveform distortion and without defeating transformer compatibility. In certain embodiments, the type of transformer is determined based on detecting characteristic voltage waveforms and based that determination an EMI filter is automatically switched in and out of the lamp circuit.

Abstract: A system includes a driver circuit, a modulator circuit, and a reset circuit. The driver circuit drives a plurality of light emitting diodes via a switch. The switch is controlled by a first signal having a first frequency. The driver circuit controls brightness of the light emitting diodes based on a second signal including a plurality of pulses. The modulator circuit modulates the first signal using a direct sequence spread spectrum modulation. The direct sequence spread spectrum modulation uses a sequence generated based on the first signal. The reset circuit resets the modulator circuit at each of the plurality of pulses of the second signal. The modulator circuit repeats the sequence at each of the plurality of pulses of the second signal.

Abstract: The invention relates to a light emitting diode (LED) illumination system, and more particularly, to systems, devices and methods of rapidly ramping up a transformer current and a LED driver current by coupling a transformer load compensation circuitry to an output of an electronic transformer. A bridge rectifier is coupled to the electronic transformer and provides full-wave rectification to an AC supply at the output of the electronic transformer. The load compensation circuitry senses the rectified AC supply and compensates the load of the electronic transformer, such that the electronic transformer starts up properly when the level of the signal envelope is below a threshold voltage. Therefore, the load compensation circuit is active for a programmed time during which the LED driver current has been increased to a sufficient value to keep the electronic transformer operational.