A processor-based device includes a chassis having a chassis ground node that is arranged to electrically couple the chassis to an earth ground. The device also includes a connector accessible from an exterior of the chassis. The connector conforms to a standardized powerline interface having a hot power signal, a load power signal, and a neutral power signal. A processor-based apparatus housed at least in part within the chassis is arranged to operate using DC power derived from AC power present at the powerline interface. A stray voltage detector is arranged to detect a stray voltage potential existing between the neutral power signal of the standardized powerline interface and the chassis ground node, and the processor-based device is arranged to communicate at least one indication of the detected stray voltage potential.

A load control device for controlling power delivered from an alternating-current power source to an electrical load may comprise a controllably conductive device, a control circuit, and an overcurrent protection circuit that is configured to be disabled when the controllably conductive device is non-conductive. The control circuit may be configured to control the controllably conductive device to be non-conductive at the beginning of each half-cycle of the AC power source and to render the controllably conductive device conductive at a firing time during each half-cycle (e.g., using a forward phase-control dimming technique). The overcurrent protection circuit may be configured to render the controllably conductive device non-conductive in the event of an overcurrent condition in the controllably conductive device. The overcurrent protection circuit may be disabled when the controllably conductive device is non-conductive and enabled after the firing time when the controllably conductive device is rendered conductive during each half-cycle.

Technologies for alternating current regulation controller include a controller configured to determine a voltage duty cycle based on a target voltage, and to determine a delay time based on the voltage duty cycle. The controller is coupled to input phases of an alternating current generator having multiple phases. Each phase is coupled to a silicon controlled rectifier. For each phase, the controller identifies a rising edge asserted on the input phase, waits the delay time after identifying the rising edge, and asserts an output pulse on an output driver coupled to the silicon controlled rectifier coupled to the input phase in response to waiting the delay time. Other embodiments are described and claimed.

A voltage-regulating phase-cut dimmable power supply includes an electromagnetic interference filter circuit, a rectifier circuit, a power conversion circuit, a transformer, a rectifier and filter circuit, a phase-cut dimming signal conversion circuit, a first optocoupler, a dimming signal conversion circuit, a voltage comparison control circuit, a second optocoupler, a pulse width modulation (PWM) control circuit, and a voltage sampling circuit. The electromagnetic interference filter circuit, the rectifier circuit, the power conversion circuit, the transformer and the rectifier and filter circuit are electrically connected in sequence. The phase-cut dimming signal conversion circuit, the first optocoupler, the dimming signal conversion circuit, the voltage comparison control circuit, the second optocoupler and the PWM control circuit are electrically connected in sequence to an output end of the electromagnetic interference filter circuit. The voltage sampling circuit is electrically connected to the voltage comparison control circuit and an output end of the rectifier and filter circuit.

Described herein are active rectification methods and systems for a rectifier of a wireless power system. Exemplary methods can include detecting, by a zero-crossing detector, one or more zero-crossings of a current at an input of the rectifier and determining a first delay time based on at least one wireless power system parameter and the zero-crossings. The methods can include generating first and second control signals for first and second switches of the rectifier, respectively, based on the first delay time; inserting a first dead time between the first control signal and the second control signal; and providing the first and second control signals to the first and second switches, respectively.

According to one embodiment, a power conversion apparatus includes: semiconductor elements mutually coupled in parallel; gate drivers which corresponds to the respective semiconductor elements and which supplies a drive voltage to the corresponding semiconductor elements; and a controller configured to supply to the respective gate drivers a gate command corresponding to the drive voltage in accordance with a carrier wave, wherein the semiconductor elements are set to a conductive state at different timings in an operation period of the semiconductor elements.

Operating an electrical load controller includes, in one aspect, detecting zero-crossings of an AC waveform, determining periods each corresponding to a full cycle of the AC waveform, determining a frequency of the AC waveform based on the determined periods, and controlling a supply of AC power to a load based thereon using the determined frequency to fire a switching circuit of the electrical load controller. In another aspect, a method includes maintaining a minimum on-time for which a control signal to the switching circuit is to remain in an ON state to fire the switching circuit; based on a desired load level setting of the electrical load controller, setting a corresponding control signal turn-on time to turn the control signal to the ON state to conduct the supply of AC power to the load, the control signal turn-on time corresponding to a firing angle of half cycles of the AC power; selecting a control signal turn-off time to turn the control signal to the OFF state, where the selecting is made between (i) a first turn-off time equal to the set turn-on time plus the minimum on-time, and (ii) a second turn-off time equal to a default turn-off time for turning the control signal to the OFF state, the control signal turn-off time corresponding to a second angle of half cycles of the AC power; and controlling the supply of AC power to the load by selectively controlling the switching circuit to conduct the supply of AC power to the load, the controlling the supply of AC power to the load including: based on turning the control signal to the ON state during a half cycle of the AC power at the set control signal turn-on time, holding the control signal in the ON state until the selected control signal turn-off time during the half cycle.

The power converter A1 includes a semiconductor device B1, and a substrate H on which the semiconductor device B1 is mounted, where the semiconductor device B1 includes a control chip constituting a primary control circuit, a semiconductor chip constituting a secondary power circuit, and a transmission circuit for electrically insulating the primary control circuit and the secondary power circuit and for signal transmission between the primary control circuit and the secondary power circuit. The substrate H has a conductive portion K. The power converter A1 includes a connecting terminal T1 disposed on the substrate H and electrically connected to the conductive portion K. The power converter A1 includes a conductive path D1 that is at least partially formed by the conductive portion K of the substrate H, and that electrically connects the primary control circuit and the connecting terminal T1. Such a configuration contributes to downsizing the power converter A1.

A load control device for controlling power delivered from an alternating-current power source to an electrical load may comprise a controllably conductive device, a control circuit, and an overcurrent protection circuit that is configured to be disabled when the controllably conductive device is non-conductive. The control circuit may be configured to control the controllably conductive device to be non-conductive at the beginning of each half-cycle of the AC power source and to render the controllably conductive device conductive at a firing time during each half-cycle (e.g., using a forward phase-control dimming technique). The overcurrent protection circuit may be configured to render the controllably conductive device non-conductive in the event of an overcurrent condition in the controllably conductive device. The overcurrent protection circuit may be disabled when the controllably conductive device is non-conductive and enabled after the firing time when the controllably conductive device is rendered conductive during each half-cycle.

Disclosed in the present invention are a charge pump circuit, a chip, and a communication terminal. The charge pump circuit comprises a phase clock generation module, an acceleration response control module, and a plurality of sub charge pump modules. By generating a plurality of clock signals with a fixed phase difference by means of the phase clock generation module, correspondingly controlling the plurality of sub charge pump modules to generate output voltages, and by means of the acceleration response control module, measuring the output voltage of each sub charge pump module, and separately outputting a logic signal to the phase clock generation module and each sub charge pump module, the frequency of the clock signals outputted by the phase clock generation module is changed, and the charge and discharge time of a capacitor in each sub charge pump module is reduced.