An apparatus monitoring system stability of a DC power system includes a switching power converter with a control loop. The converter is connected to a DC bus of the system. A monitoring loop injected into the control loop includes a sensor circuit monitoring voltage and current of the DC bus and a small signal injector producing a periodic signal with variable amplitude and frequency and injects the periodic signal on a reference signal of the control loop. The monitoring loop includes a stability measurement circuit that varies a frequency input to the small signal injector until the periodic signal has a frequency equal to a system minor loop gain crossover frequency of an impedance ratio of a converter closed loop output impedance and an impedance of the DC power system. The monitoring loop includes a measurement output circuit that outputs a DC power system stability margin at the crossover frequency.

An electronic device includes a power receiving unit that receives power from an external device, a first voltage conversion unit that generates a first output voltage regardless of a variation of the input voltage, a second voltage conversion unit in which a second output voltage varies due to a variation of the input voltage, a voltage supply unit that steps up or down the first output voltage or the second output voltage and supplies the output voltage to a load circuit of the electronic device, and a control unit that performs control so as to supply power to the load circuit of the electronic device by switching to the first voltage conversion unit or the second voltage conversion unit based on a voltage supplied to the load circuit of the electronic device.

A hierarchical approach is provided to integrate functions and components into the various systems and subsystems within a distribution network, including standardization of modular and scalable power electronics power blocks with embedded diagnostics and prognostics.

A power control circuit and a control method thereof. The circuit includes: a power supply module, a voltage change signal module, an output module, a first switch module and a second switch module; the power supply module is configured to output power supplies of different power through two output terminals according to an output of an external power supply end and a received first control signal; the output module is configured to provide the power supplies to an information processing system connected to the output module, and transmit a trigger signal provided by the information processing system to the voltage change signal module; the first switch module and the second switch module are configured to disconnect and conduct a power supply channel between the output module and the power supply module according to a received second control signal and third control signal; the voltage change signal module is configured to output the first control signal to the power supply module according to the trigger signal, and output the second control signal and the third control signal to the first switch module and the second switch module, respectively.

In a power supplying system, a selection unit that selects one of a first power feed unit and a second power feed unit, a first voltage determination unit that compares a voltage of an output of the first power feed unit with a first threshold value, a second voltage determination unit that compares a voltage of an output of the second power feed unit with a second threshold value, and a management unit that sets the first threshold value and the second threshold value are provided.

A control method for a power source, the method including the following steps: detecting the electric power quality of multiple channels of inputs of a power source; in response to the electric power quality of the multiple channels of inputs being normal, acquiring and comparing the resistance of a relay when the power source is respectively working at each channel of input; in response to the resistance of the relay at each channel of input meeting a preset condition, acquiring the duration how long each power source is working at one channel of input among the multiple channels of inputs; and in response to the duration how long the power source is working at the channel of input in the multiple channels of inputs being greater than a threshold value, adjusting the power source to work at other channel of input.

A motorized window treatment may be configured to adjust a position of a covering material to control the amount of daylight entering a space. The motorized window treatment may include a DC power source for charging an energy storage element, such as a supercapacitor and/or rechargeable battery. The energy storage element may be configured to provide power for the operation of a motor used to adjust the position of the covering material. The energy storage element may discharge when providing power to the motor and may charge such that the current it draws from a battery is at a desired average current level that extends the lifetime of the battery.

A power generation grid for a vessel, rig or platform includes a primary energy source located above the waterline and a plurality of DC sub-assemblies, located below the waterline. Each DC sub-assembly has a DC bus, a DC/DC converter adapted to couple the DC bus to a DC energy source; an AC/DC converter adapted to couple the DC bus to an AC energy source; a DC/AC converter adapted to couple the DC bus to a corresponding load, and a first switch adapted to couple the DC bus to a DC bus of another DC sub-assembly.

Based on a first signal, a first voltage output circuit outputs a first output voltage which is based on a first voltage or does not output the first output voltage. Based on a second signal, a second voltage output circuit outputs a second output voltage which is based on a second voltage or does not output the second output voltage. When a level of the first voltage is lower than a reference level, a voltage detector circuit outputs the first signal such that the first voltage output circuit does not output the first output voltage and outputs the second signal such that the second voltage output circuit outputs the second output voltage. The second voltage output circuit outputs the second output voltage such that the second output voltage has a level of the first output voltage when the level of the first voltage is the reference level.

A charger, a data cable, and a charging device. The charger includes a first Type-A port, a PD charging processing unit, a non-PD charging processing unit, a data cable matching unit, and a first switching unit; where the first Type-A port includes a first communication pin and a second communication pin, and in a case that the charger is connected to a first data cable, the first switching unit connects the first communication pin to the PD charging processing unit and the second communication pin to the data cable matching unit to transmit a PD charging signal through the first communication pin, where the data cable matching unit determines, based on a communication signal transmitted through the second communication pin, whether the data cable is a first data cable.