Abstract: An LED power supply (100) configured to detect a characteristic of an input signal, includes a Buck power factor control circuit (D1, U1, Q1, D2, L1, C1) being configured to receive an input signal, the input signal (VAC) being referenced to a power ground, and to output an output signal, the output signal (Vout) being referenced to an output ground, wherein the output ground is level shifted with respect to the power ground; and a controller (106) configured to output an LED drive signal, the controller referenced to the output ground, wherein the controller is configured to determine the characteristic of the input signal according to a switching time of the Buck power factor control circuit, the switching time of the Buck power factor control circuit being determined by the controller according to a switching signal referenced to the output ground.

Abstract: This disclosure describes, in part, techniques for reducing pulsating currents of internal power sources, such as batteries. For example, a device may include a power source, a load, and a control device located between the power source and the load. The control device may include a power converter that is configured to maintain a constant input current from the power source and output a pulsating current to the load. While regulating the power, the control device may determine whether an average output power is different than a reference power. If the average output power is equal to the reference power, then the control device may cause the power converter to maintain the constant input current. However, if the average output power is different than the reference power, then the control device may cause the power converter to alter (e.g., decrease/increase) the input current being received from the power source.

Abstract: An LED power supply (100) configured to detect a characteristic of an input signal, includes a Buck power factor control circuit (D1, U1, Q1, D2, L1, C1) being configured to receive an input signal, the input signal (VAC) being referenced to a power ground, and to output an output signal, the output signal (Vout) being referenced to an output ground, wherein the output ground is level shifted with respect to the power ground; and a controller (106) configured to output an LED drive signal, the controller referenced to the output ground, wherein the controller is configured to determine the characteristic of the input signal according to a switching time of the Buck power factor control circuit, the switching time of the Buck power factor control circuit being determined by the controller according to a switching signal referenced to the output ground.

Abstract: Techniques for synchronizing acquisition of image data by cameras in a multi-camera system using a waveform associated with an AC power supply for the cameras. Each camera in the multi-camera system may receive power from the AC power supply provided using an AC voltage signal. Further, each camera may be configured to identify predefined voltages on a waveform of the AC voltage signal. By detecting the predefined voltage on the waveform of the AC voltage signal, the cameras may be synchronized according to a frequency of the AC voltage signal. The cameras may be configured to synchronize acquisition of image data from respective imaging sensors based on the frequency of the AC voltage signal. In this way, the cameras of the multi-camera system may be synchronized using an AC power signal delivered through wires that are used to deliver power to the multiple cameras.