A power transmission apparatus with over-loading protection and power-saving mechanism is provided. The power transmission apparatus includes a switch module and a control module. The switch module includes a first switch circuit, a second switch circuit and a protection circuit. The first switch circuit is coupled between a power input module and a power supply port. The second switch circuit is coupled to the power input module. The protection circuit is coupled between the second switch circuit and the power supply port and detects a load power of the power supply port when the second switch circuit is turned-on. When the load power is greater than a predetermined over-loading threshold, the protection circuit enables the first switch circuit. After the control module determines that the first switch circuit is enabled, the control module controls the first switch circuit keeps enabling and disables the second switch circuit and the protection circuit.

A power supply apparatus is disclosed. The power supply apparatus to supply power to an electronic apparatus includes a first relay and a second relay which are turned on and off to control power supply with respect to the electronic apparatus, and a processor configured to control a switching operation of the first relay and the second relay based on at least one of a connection detection signal indicating connection of the power supply apparatus and the electronic apparatus, and a power on/off signal indicating a power on/off command with respect to the electronic apparatus.

A homeostatic heat trace powered by wind and solar electrical generators for preventing freeze-up of equipment at remote sites. A heat trace system wherein solar power may be used as backup when wind velocities are too low or high. A heat trace with a UPS backup for preventing freeze-up of equipment at remote sites during power failure. A homeostatic control system for maximizing the utilization of energy stored in a bank of batteries. A programmable logic controller with a homeostatic control system for maintaining battery charge. A homeostatic heat trace system powered by wind and backed up by solar power to prevent freeze-up of equipment at remote sites, including oil and gas wells.

Systems and methods for supplying power (both active and reactive) at a medium voltage from a DCSTATCOM to an IT load without using a transformer are disclosed. The DCSTATCOM includes an energy storage device, a two-stage DC-DC converter, and a multi-level inverter, each of which are electrically coupled to a common negative bus. The DC-DC converter may include two stages in a bidirectional configuration. One stage of the DC-DC converter uses a flying capacitor topology. The voltages across the capacitors of the flying capacitor topology are balanced and switching losses are minimized by fixed duty cycle operation. The DC-DC converter generates a high DC voltage from a low or high voltage energy storage device such as batteries and/or ultra-capacitors. The multi-level, neutral point, diode-clamped inverter converts the high DC voltage into a medium AC voltage using a space vector pulse width modulation (SVPWM) technique.

The present invention provides an apparatus for receiving non-contact energy that includes; a receiving unit that is spaced from a transmitting unit and receives thermal or light energy from the transmitting unit; an energy converting unit that converts the thermal or light energy received from the receiving unit into electric energy and supplies electric energy to a target device; and an auxiliary power that receives electric energy from the receiving unit or the energy converting unit and supplies electric energy to the target device when the energy transmitted from the receiving unit or the energy converting unit to the target device is cut off, and a method of controlling the device. According to the present invention, it is possible to stably supply energy that is not harmful to the human body and, has a wide transmission region.

A Network Distributed High Voltage Direct Current Power Supply Management Method, includes the following steps: multiple high voltage direct current power supply devices are deployed in parallel connected, ensuring that at least one high voltage direct current power supply device not needs to connect with load; there are four power supply modes pre-set in each high voltage direct current power supply device, and the first detection node and the second detection node are set in each device; detect the status of the first detection node and the second detection node, and adopt the predetermined method to change the power supply mode of the high voltage direct current power supply device as per the predetermined condition.

A Network Distributed High Voltage Direct Current Power Supply Management Method, includes the following steps: multiple high voltage direct current power supply devices are deployed in parallel connected, ensuring that at least one high voltage direct current power supply device not needs to connect with load; there are four power supply modes pre-set in each high voltage direct current power supply device, and the first detection node and the second detection node are set in each device; detect the status of the first detection node and the second detection node, and adopt the predetermined method to change the power supply mode of the high voltage direct current power supply device as per the predetermined condition.

An uninterruptible power supply (UPS) includes a rectifier circuit coupled to an AC input and configured to produce a DC voltage between first and second DC buses, an inverter circuit coupled to the first and second DC buses and configured to produce an AC voltage at the AC output. The UPS further includes an auxiliary power circuit comprising third and fourth DC buses configured to be coupled to a DC power source and third and fourth capacitors coupled between respective ones of the third and fourth DC buses and the neutral and respective first and second switches configured to couple and decouple respective ones of the third and fourth DC buses to and from respective ones of the first and second DC buses. The third and fourth capacitors may have capacitances greater than capacitances of the first and second capacitors.

A standby circuit and device to reduce power consumption of appliances in standby mode comprise a power regulator, a power detecting circuit, and a HIC module. The HIC module can control the power regulator to turn off when a detected power consumption of a load is within a predetermined power consumption range.

An apparatus may include a plurality of power inputs configured to receive direct current from a plurality of external power adapters that convert alternating current to direct current. The plurality of external power adapters may include a primary external power adapter and at least one backup external power adapter. The apparatus may also include a power output configured to provide direct current to a device. In addition, the apparatus may include a switching mechanism that, when the primary external power adapter is operational, supplies direct current from the primary external power adapter to the power output and, when the primary external power adapter fails, supplies direct current from the backup external power adapter to the power output. Various additional apparatuses, systems, and methods are also disclosed.