A load control device may control power delivered from a power source, such as an alternating-current (AC) power source, to at least two electrical loads, such as a lighting load and a motor load. The load control device may include multiple load control circuit, such as a dimmer circuit and a motor drive circuit, for controlling the power delivered to the lighting load and the motor load, respectively. The load control device may adjust the rotational speed of the motor load in a manner so as to minimize acoustic noise generated by the load control device and reduce the amount of time required to adjust the rotational speed of the motor load. The load control device may remain powered when one of the electrical loads (e.g., the lighting load) has been removed (e.g., electrically disconnected or uninstalled) and/or has failed in an open state (has “burnt out” or “blown out”).

A communication circuit generates a clock signal that is a digital signal corresponding to a serial clock, and a data signal that is a digital signal corresponding to serial data to be sent. A modulation circuit generates a first modulated signal obtained by digital modulating a first carrier wave having a first frequency with the clock signal and second modulated signal obtained by modulating the second carrier wave having a second frequency different than the first frequency with the data signal, and applies the first modulated signal and the second modulated signal between a first conductor and a second conductor. A demodulation circuit includes a buffer amplifier that has high input impedance, demodulates the first modulated signal and the second modulated signal, and generates the clock signal and the data signal. The communication circuit acquires serial data on the basis of the clock signal and the data signal.

Systems, devices, and methods include a controller and a power unit coupled to a load device. The controller receives an altered AC signal, the altered AC signal comprising delays within an AC signal during a downward portion of a positive half cycle of the AC signal, determines a message from the delays within the altered AC signal, determines an action to execute based on the message, determines whether the delays present within a portion of the altered AC signal include a rising type delay, in response to determining the presence of the rising type delay in the altered AC signal, causes the power unit to introduce voltage within the altered AC signal transforming the portion of the altered AC signal including the rising type delay into a conditioned power signal, and transmits the altered AC signal or the conditioned power signal to the load device based on the action.

A load control device may control power delivered from a power source, such as an alternating-current (AC) power source, to at least two electrical loads, such as a lighting load and a motor load. The load control device may include multiple load control circuit, such as a dimmer circuit and a motor drive circuit, for controlling the power delivered to the lighting load and the motor load, respectively. The load control device may adjust the rotational speed of the motor load in a manner so as to minimize acoustic noise generated by the load control device and reduce the amount of time required to adjust the rotational speed of the motor load. The load control device may remain powered when one of the electrical loads (e.g., the lighting load) has been removed (e.g., electrically disconnected or uninstalled) and/or has failed in an open state (has burnt out or blown out).

A power line communication device includes a DC power source device, a power line, and a master station that modulates a supply voltage VBUS supplied to the power line according to transmission data to be transmitted. The master station includes a modulation capacitor that is precharged with a modulation amplitude voltage, a polarity switch unit that determines a polarity of the modulation capacitor connected to the power line according to transmission data, and an inductor connected between the DC power source device and the power line.

A power line communication device includes a DC power source device, a power line, and a master station that modulates a supply voltage VBUS supplied to the power line according to transmission data to be transmitted. The master station includes a modulation capacitor that is precharged with a modulation amplitude voltage, a polarity switch unit that determines a polarity of the modulation capacitor connected to the power line according to transmission data, and an inductor connected between the DC power source device and the power line.

A load control device may control power delivered from a power source, such as an alternating-current (AC) power source, to at least two electrical loads, such as a lighting load and a motor load. The load control device may include multiple load control circuit, such as a dimmer circuit and a motor drive circuit, for controlling the power delivered to the lighting load and the motor load, respectively. The load control device may adjust the rotational speed of the motor load in a manner so as to minimize acoustic noise generated by the load control device and reduce the amount of time required to adjust the rotational speed of the motor load. The load control device may remain powered when one of the electrical loads (e.g., the lighting load) has been removed (e.g., electrically disconnected or uninstalled) and/or has failed in an open state (has burnt out or blown out).

The present invention discloses a method for generating a low-frequency power carrier control signal. An alternating current power supply voltage/current of a target control device is enabled to experience a specified small jump within n T periods; a jump state in each period is respectively represented by one binary code; different combinations of the jump states in the n T periods and different combinations of formed n binary codes are preset to correspond to different control instructions in a system. After the target control device monitors the voltage/current jump, on the basis of a preset corresponding rule between the n binary codes as well as the jump state codes and the control instructions, control can be implemented according to a corresponding control instruction.

An embodiment of a method of communicating between a surface processing unit and an energy industry tool includes: receiving a power signal from a power source at an integrated interface device of a communication and processing system, the communication and processing system located between a surface processing unit and an energy industry tool, the interface device including a processor and a variable output power supply; receiving a communication at the processor from a surface processing unit; transmitting a control signal from the processor to the variable output power supply, the control signal including a series of pulses having a duty cycle that is varied to cause the power supply to generate a modulated direct current (DC) output signal having at least one of a frequency and an amplitude that is modulated according to a communication protocol to represent the communication; and transmitting the modulated output signal to a tool.

The present disclosure relates to a system for at least one of identifying or verifying which specific data center device, from a plurality of data center devices, is being powered from an AC outlet of a power distribution unit. The system includes a message encoding algorithm module, a message decoding algorithm module and an input signal monitoring subsystem. The input signal monitoring subsystem monitors an AC power signal being supplied to the data center devices, wherein one of the data center devices includes an AC powered target device. A power distribution unit (PDU) supplies the AC power signal to the AC powered target device. The PDU has a controller which uses the message encoding algorithm to create a modulated AC power signal that includes an encoded message in accordance with a predetermined power cycle profile (PCP) event. The target device analyzes the PCP event as the modulated AC power signal is received and creates a decoded message therefrom. The decoded message is used to indicate whether the AC outlet of the PDU is providing power to the target device.