A method for operation of UPS modules connected in parallel is provided. The method includes: in a case that a UPS system is constructed based on multiple UPS modules connected in parallel, sleeping, based on a system load rate, a predetermined number of UPS modules to control the UPS system to operate at a predetermined efficiency level; controlling UPS modules not being slept in the UPS system to enter into a main-inverter power supply mode or a main-bypass common mode to perform reactive power and harmonic compensation; and waking up the slept UPS modules when the system load rate drops by a predetermined value due to a sudden addition of a load. The UPS modules can be slept or waked up intelligently based on the system load rate in the dynamic online mode, ensuring that the UPS system operates around highest efficiency.

A device and method are provided for saving power and electricity in a charging device including external power supplies and battery chargers having a primary circuit and a secondary circuit where a switch is located in the primary circuit and a current sensing device in the secondary circuit to sense when there is a drop in current in the secondary circuit or no current in the secondary circuit because the load such as a cell phone or tablet is charged and when this occurs the switch in the primary circuit is opened and the primary circuit no longer draws power from the source of power until the switch in the primary circuit is closed by either a user activating a switch to reenergize the charging device, where the switch may be powered by an on-board battery to close the primary circuit, or where a control circuit is activated by a program in the load or device to be charged, such that the charging device will cycle on and off according to an external app program residing on the device to be charged or some other device not attached to the controller.

The technology described herein relates to methods and systems for reducing standby power consumed by electronic devices. A control unit is powered by a control unit power source. The control unit power source, in some embodiments, comprises a first photovoltaic driver and a second photovoltaic driver mounted in an anti-parallel configuration. In other embodiments, the control unit power source is a battery (e.g., a rechargeable battery). In addition, the control unit can cause a load power source to switch off upon detection of an absence of a load (e.g., by using the load detector) without the use of a shunt resistor. The control unit also causes the load power source to discharge electricity to the load upon detection of the load.

A portable energy system is provided and includes a controller configured to control periodic polling to determine when a load is attached or actively connected to the portable energy system, such that when the load is attached to the portable energy system, the controller energizes the portable energy system for supplying power to the load, and when the load is not attached or not actively connected to the portable energy system, the controller deenergizes the portable energy system output for not supplying power to the load.

Disclosed is an internet of things (IoT) smart home/building automation system (IoT smart system) for cutting off network standby power, the system comprising: a master which performs a hub function and a control function and comprises at least one of communication modules, a power source switching unit, a power source supply/cut-off module, a wired/wireless power transmitting/receiving unit which is a means supplying a wake-up power that causes the operation of various IoT devices, a power source unit, and a router or gateway for connection with an external network and a IoT smart system platform over a cloud; a smart multi-socket which, by connecting with a smart socket (one socket or a multi-socket with multiple sockets) that connects to a conventional power source socket, and connecting IoT devices for which the network standby power is in a cut-off state, receives wake-up power from the master and supplies wake-up power to the IoT devices; IoT devices having a structure so as to cut off the network standby power and the standby power for the devices themselves, and IoT devices for which a power source is always supplied; IoT devices comprising at least one sensor operated by a battery; and a non-IoT smart socket which can connect non-IoT devices to the system.

A power adapter (1) for cutting off standby power and a control method therefor are disclosed, the power adapter (1) comprising a power supply unit generating various kinds of power required for an electronic product (400) so as to supply the generated power through an adapter jack. The power adapter (1) comprises: a control unit (80) including at least one microprocessor (U1); a power switching unit (10) configured to cut off the power supplied to the electronic product and cut off a power supply to the power adapter when the power of the electronic product is turned off and a battery is fully charged or when the electronic product is disconnected, and to supply power under the control of the control unit (80); a current sensing unit (CT) configured to sense that the power of the electronic product is turned off and the battery thereof is fully charged; an electronic product connection sensing unit (50) for checking whether the electronic product is connected in a state in which power is cut off so as to provide the checking result to the control unit (80); a sleep power source unit (30) having a battery to be charged with power from the power supply unit (20) when the power is supplied, and configured to supply power only to the microprocessor (U1) and the product connection sensing unit (50) even when the power switching unit (10) is disconnected; a sensing power switching means (40) configured to supply operating power only during periodic checking of whether the electronic product is connected in a state in which power is cut off; and a sleep power sensing means for monitoring a voltage of the sleep power source unit (30) so as to prevent an operation error due to over-discharge of the sleep power source unit (30) when power is cut off. The power adapter of the present invention adds a circuit for the power adapter without a design change of the electronic product such that a conventional power supply jack of the electronic product can be connected and used as is.

The invention relates to a secure electrical supply system for powering an electrical load (3) comprising: a main electrical power supply source (1), an electrical power supply circuit (8) linking the main electrical power supply source (1) to the electrical load, at least one control unit (5) for opening or closing said electrical power supply circuit (8), a secondary electrical power supply source (2) connected to the electrical power supply circuit and designed to power the electrical load (3) in case of interruption of the electrical power supply provided by the main electrical power supply source (1), a control device (6) comprising an emitter device (60) designed to dispatch a message representative of a change of state of the control unit (5) and a receiver device (61) designed to receive said message and to control the turning on or the turning off of said secondary electrical power supply source (2) according to the new state taken by the control unit (5).

A charging device and a control method for the charging device are provided. The charging device includes an AC/DC converting circuit and a main controller. The main controller includes a first modulation module and a second modulation module. The operation of the switching circuit controlled by the second modulation module consumes less amount of electric energy than the operation of the switching circuit controlled by the first modulation module. When the charging device is in the heavy load condition, the first modulation module is enabled to control the operation of the switching circuit. When the charging device is in the light load condition or the no load condition, the second modulation module is enabled to control the operation of the switching circuit. Consequently, the power consumption of the charging device in the light load condition or the no load condition is reduced.

A control circuit includes a first input coupled to a power source, a second input coupled to an output of a power supply, and an output coupled to an input of the power supply. The control circuit senses current at the power supply output. If the sensed current exceeds a threshold, the control circuit connects the power supply input to the power source. If sensed current does not exceed the threshold, the control circuit disconnects the power supply input from the power source and applies a voltage to the power supply output. If the sensed current exceeds the threshold while the power supply input is disconnected from the power source and while the control circuit is applying voltage to the power supply output, the control circuit discontinues application of voltage to the power supply output and connects the power supply input to the power source.

An electric transfer apparatus includes a controller that maintains power to a user interface of an electronic device when a contact failure occurs for a battery pack used to power the electronic device. The power may be maintained by connecting an auxiliary storage to the user interface when the contact failure occurs. A controller may control a switch to selectively connect the user interface to the battery pack or auxiliary storage.