An interface circuit includes: a plurality of signal transmitter circuits each receiving an input signal and outputting an output signal responsive to a first power supply voltage based on the input signal; an operation control circuit controlling operation/suspension of the signal transmitter circuits; and an amplitude control circuit exerting control so that the first power supply voltage be greater with increase in the number of operating circuits among the signal transmitter circuits and thereby the amplitude of the output signals of the signal transmitter circuits become greater.

A conference system with low standby power consumption includes a transmitter, an image data source, a receiver, and a display device. The transmitter includes a battery for providing power, at least one link port for accessing data, and a processor coupled to the battery and the at least one link port. The image data source is used for transmitting the image data to the transmitter. The receiver is linked to the transmitter for receiving the image data. The display device is linked to the receiver for displaying the image data. When the transmitter and the image data source are electrically coupled, the processor ceases to use the battery of the transmitter and controls the image data source for providing power to the transmitter. When the transmitter and the image data source are separated, the processor uses the battery of the transmitter for driving firmware of the transmitter.

A computer may be provided on a mining machine comprising a mother board, a power supply in operable communication with the mother board, an input/output interface in communication with the mother board, and a plurality of hash boards each in communication with the mother board and comprising a plurality of mining chips. The computer may execute instructions that cause the computer to perform establishing communication with an external device, retrieving at least one profit variable from the external device, calculating an estimated profitability of a first mining chip based on the profit variable, and adjusting a chip voltage supplied to the first mining chip and adjusting a chip frequency of the first mining chip to maximize the estimated profitability. Alternatively, the instructions may cause the computer to adjust the chip voltage and the chip frequency to maintain a temperature within a predetermined range.

A buck-boost power converter is operable in a first mode (step-down) or in a second mode (step-up). The power converter has an inductor, a flying capacitor, a network of six switches and a driver adapted to drive the network of switches with a sequence of states. Depending on the mode of operation the sequence of states comprises at least one of a first state and a second state. In the first state the ground port is coupled to the second port via two paths, a first path comprising the flying capacitor and the inductor, and a second path comprising the flying capacitor while bypassing the inductor. In the second state the first port is coupled to the second port via a path that includes the inductor and the ground port is coupled to the first port via a path that includes the flying capacitor while bypassing the inductor.

A system is provided that includes a power transmitter configured to provide power to a current loop, a power receiver configured to receive the power from the current loop. The power receiver is configured to, on a periodic basis, disconnect from the current loop to stop pulling power from the current loop for a period of time to enable a safety check to be performed by the power transmitter. The power transmitter is configured to: monitor current on the current loop; determine whether a current level on the current loop passes the safety check within a predetermined time interval since a determination that the current level was not within a safe range; and control connectivity of the power to the current loop depending on whether the safety check has or has not passed within the predetermined time interval.

A rated power supply system powered by PoE receives power from external power sources and supplies power to PDs. The system connects with PDs through PoE output interfaces. The system has a PoE analog controller to turn on/off of the output power of all the PoE output interfaces. The PoE analog controller also detects the output current of all the PoE output interfaces. The system has a packet switch controller, a power state detecting circuit and a voltage conversion circuit. The voltage conversion circuit merges the power received from external power sources to generate a first voltage. The CPU calculates an output current upper limit based on the first voltage. The CPU gets a total output current from the PoE analog controller. If the total output current exceeds the output current upper limit, the CPU will turn off the PoE output interfaces according to power output priorities of the PoE output interfaces.

A mobile terminal, an on-the-go (OTG) control and configuration method, and a storage medium, wherein the method includes: obtaining an accumulated number of changes of differences in voltages of at least one of a positive data line and a negative data line in an OTG data cable at intervals; according to the accumulated number of changes of the differences in the voltages of at least one of the positive data line and the negative data line in the OTG cable, querying a lookup table pre-stored in the mobile terminal for a current value corresponding to the number of changes; and according to the queried current value, controlling the mobile terminal to set the current value as a current limit for an OTG peripheral device.

A power supply device includes: a power supply circuit configured to operate with reference to a second ground connected to a first ground via a common ground and output a direct current (DC) voltage between the first ground and an output line; and a sensing circuit configured to sense a first potential difference between the first ground and the second ground, wherein the power supply circuit adjusts the DC voltage according to the first potential difference sensed by the sensing circuit.

A power supply device includes: a power supply circuit configured to operate with reference to a second ground connected to a first ground via a common ground and output a direct current (DC) voltage between the first ground and an output line; and a sensing circuit configured to sense a first potential difference between the first ground and the second ground, wherein the power supply circuit adjusts the DC voltage according to the first potential difference sensed by the sensing circuit.

A demand response system includes a mobile application of a mobile device that is configured to initiate altering an operating condition of a network device disposed at a site using location based services. A demand response application interface module is configured to enable access between a utility company and the network device to communicate energy management information therebetween. The network device is configured to be remotely altered by each of the demand response application interface module and the mobile application separately based on the location based services and the energy management information. A method of managing a demand response system includes detecting a user being disposed away from a site, detecting energy management information from a utility company associated with the site, and initiating a reduction in energy use at the site in response to the relative location of the user and the energy management information.