An output inductance value controlling method, apparatus, and computer device for a multi-tap reactor. A single output port of the multi-tap reactor is correspondingly connected to a single relay, and each relay is connected to a general power supply of all air conditioner internal units. When in use, an air conditioning system acquires a motor speed and a phase current of each air conditioner internal unit separately, and then calculates a sum of motor powers of all the air conditioner internal units according to the motor speeds and the phase currents. The system matches a basic inductance value required by the air conditioner internal units according to the sum of motor powers, sets a current output inductance value of the multi-tap reactor according to the basic inductance value, and inputs the output inductance value into the corresponding air conditioner internal units.

An output inductance value controlling method, apparatus, and computer device for a multi-tap reactor. A single output port of the multi-tap reactor is correspondingly connected to a single relay, and each relay is connected to a general power supply of all air conditioner internal units. When in use, an air conditioning system acquires a motor speed and a phase current of each air conditioner internal unit separately, and then calculates a sum of motor powers of all the air conditioner internal units according to the motor speeds and the phase currents. The system matches a basic inductance value required by the air conditioner internal units according to the sum of motor powers, sets a current output inductance value of the multi-tap reactor according to the basic inductance value, and inputs the output inductance value into the corresponding air conditioner internal units.

A transformer assembly for electric grids including: an electric transformer including a magnetic core, a first side including one or more first windings enchained with said magnetic core and adapted to be electrically connected to a first grid section and a second side including one or more second windings enchained with said magnetic core and adapted to be electrically connected to a second grid section; a tap changer operatively associated with said electric transformer to vary the number of turns enchained with said magnetic core for said first windings; a control unit to: acquire input data indicative of an electrical connectivity condition of said second grid section with said second windings; determine whether said transformer is in a load condition or in a no-load condition; and, in a no-load condition, command said tap changer to set a maximum available number of turns for said first windings.

An electronic apparatus includes: an operator; and a power circuit configured to supply power to the operator, wherein the power circuit includes a first voltage converter configured to output a first voltage based on input power, and a power factor corrector (PFC) configured to output a second voltage by performing power factor correction for the first voltage, and supplies power based on the first voltage or the second voltage to the operator, wherein the power circuit stops an operation of the PFC, lowers the first voltage to have a level corresponding to the second voltage, and supplies power based on the lowered first voltage to the operator, based on power consumption of the operator lower than or equal to a predetermined value.

A switching power supply device that switches setting of an output voltage based on an external signal according to one or more embodiments includes: a transformer including a primary winding and n secondary windings; n synchronous rectification elements provided, corresponding to the n secondary windings; and n−1 switch elements that switch the secondary windings. Each of the n−1 switch elements is kept on or off according to a high or low voltage value out of set voltages of the output voltage, and all or any of the n synchronous rectification elements are selected to synchronously rectify pulse voltage of the secondary windings, and when operation with a high set value of the output voltage stops, a synchronous rectification element used to output the high set value performs switching operation until the output voltage goes down to the low voltage value of the set voltages of the output voltage.

System and methods for optimizing operation of a wind turbine are disclosed. In one aspect, the method also includes determining, via a converter controller of a power converter, a tap position of a tap changer configured between the power grid and a primary winding of a transformer. Another step includes calculating, via the converter controller, a primary voltage of the primary winding as a function of the tap position. The method also includes implementing, via the converter controller, a control action if the primary voltage or a measured secondary voltage of a secondary winding of the transformer is outside of a predetermined voltage range.

System and methods for optimizing operation of a wind turbine are disclosed. In one aspect, the method also includes determining, via a converter controller of a power converter, a tap position of a tap changer configured between the power grid and a primary winding of a transformer. Another step includes calculating, via the converter controller, a primary voltage of the primary winding as a function of the tap position. The method also includes implementing, via the converter controller, a control action if the primary voltage or a measured secondary voltage of a secondary winding of the transformer is outside of a predetermined voltage range.

An isolation transformer boost system. The system includes a power supply and an isolation transformer. The isolation transformer includes a primary winding electrically connected to the power supply, a secondary winding, a first voltage tap, and a second voltage tap. Wherein the isolation transformer is configured to, in response to a command from an electronic processor, disconnect a connection from the second voltage tap and establish a second connection from the first voltage tap, wherein the command is based on an electrical characteristic measurement of the power supply exceeding an upper limit threshold for a predetermined period of time.

It is described an outdoor lighting apparatus (1) for fixed installation adapted to be connected to a power grid for being supplied with a grid supply voltage. The apparatus (1) comprises at least one light source (6), a driving circuit (30) of the at least one light source (6), a control and communication circuit (20) adapted to control the driving circuit (30) and adapted to communicate with a remote control device (60). The lighting apparatus (1) is adapted to be selectively supplied from the power grid with a first supply voltage value and with a second supply voltage value lower than the first voltage value. In that way, it is possible advantageously to supply the lighting apparatus (1) during the daytime with a safety voltage in order to reduce the electrical hazard.

It is described an outdoor lighting apparatus (1) for fixed installation adapted to be connected to a power grid for being supplied with a grid supply voltage. The apparatus (1) comprises at least one light source (6), a driving circuit (30) of the at least one light source (6), a control and communication circuit (20) adapted to control the driving circuit (30) and adapted to communicate with a remote control device (60). The lighting apparatus (1) is adapted to be selectively supplied from the power grid with a first supply voltage value and with a second supply voltage value lower than the first voltage value. In that way, it is possible advantageously to supply the lighting apparatus (1) during the daytime with a safety voltage in order to reduce the electrical hazard.