摘要:
The present disclosure relates to a standby power cut-off device provided on a power line connected from a commercial alternating current (AC) power source to an inside of an electrical apparatus, the device including: a manual switch that supplies or cuts off power from the commercial AC power source; a non-contact relay that supplies the commercial AC power to an output side when a current flows to an input side according to the operation of the manual switch; a low-power supply unit that converts and supplies a voltage of the commercial AC power supplied by the non-contact relay; a microprocessor that receives power supplied by the low-power supply unit and controls the operation of the standby power cut-off device; a control signal generator that sends a control signal to the microprocessor when a current flows according to the operation of the manual switch; a capacitor that is charged and then discharged according to the operation of the manual switch; and a resistor that causes a charging voltage of the capacitor to be greater than an operating voltage of the control signal generator, wherein when the manual switch operates, that is, when turning on or off the electrical apparatus, a current flows uninterruptedly in the control signal generator due to a discharge of the capacitor so as to prevent a malfunction due to the multiple operation control of the microprocessor.
摘要:
A radio-frequency (RF) generator is provided that produces a controlled overshoot. One embodiment includes a RF power amplifier and a direct-current (DC) power supply that includes a primary DC power supply, an auxiliary DC power supply, a half-bridge circuit, and a control circuit. The half-bridge circuit, in a first switching state, electrically connects, in series, the auxiliary DC power supply with the primary DC power supply and, in a second switching state, electrically disconnects the auxiliary DC power supply from the primary DC power supply. The control circuit places the half-bridge circuit in the first switching state for a first period of time and places the half-bridge circuit in the second switching state for a second period of time to produce a controlled overshoot in the power produced by the RF generator throughout the first period of time.
摘要:
The invention relates to a method for determining the capacitance of an energy store (A1, A2) of a direct current supply unit for the uninterruptible supply of direct current to a load (L), the direct current supply unit comprising at least one input (E) for an input voltage, one output (A) for a DC output voltage, and two identical energy stores (A1, A2) which provide a standby DC output voltage in buffer mode. To determine the actual capacitance without jeopardising a buffer mode, the following steps are provided: in a first step, a charged first energy store (A1) is fully discharged at predefined intervals via a load (L) applied to the output (A); in a second step, the first energy store (A1) is charged from the fully charged second energy store (A2); and in a third step, the second energy store (A2) is fully charged again via the input (E); wherein the capacitance taken from the second energy store (A2) is measured in the second step and/or the capacitance in the charged second energy store (A2) is measured in the third step.
摘要:
An uninterruptible power supply includes a first power converter, a second power converter, and a DC-to-AC converter coupled to the first power converter and the second power converter. The first power converter includes a first AC-to-DC converter and a transformer having a primary winding coupled to the input and the output, and a secondary winding coupled to the first AC-to-DC converter. The first power converter is configured, during a first mode of operation of the UPS, to provide a first portion of the AC input power as the AC output power via the primary winding and convert a second portion of the AC input power into DC power via the first AC-to-DC converter. The second power converter includes a second AC-to-DC converter and is configured to convert the AC input power into DC power via the second AC-to-DC converter during a second mode of operation of the UPS.
摘要:
A power management and distribution system (100) may comprise a first plurality of power sources (102), a first collector bus (118) configured to receive power from the first plurality of power sources (102), an unregulated DC bus (120) configured to receive power from the first collector bus (118), a regulated high voltage direct current (HVDC) bus configured to receive a first power from the unregulated DC bus (120), a first primary load bidirectional DC/DC converter (132) configured to receive a second power from the unregulated DC bus, a first primary PDU configured to receive at least one of the first power from the regulated HVDC bus and the second power from the first primary load bidirectional DC/DC converter. The first primary PDU may be configured to supply power to a primary load such as a motor or actuator.
摘要:
Provided are a ship and a power management method of the ship. The ship comprises: a power grid; at least one generator that is connected to the power grid and supplies electricity to the power grid; a high-capacity battery connected to the power grid, and charged by receiving the electricity from the power grid or discharged to supply power to the power grid; a plurality of load components connected to the power grid; and a controller for receiving generator load information from the at least one generator, sensing a voltage of the power grid to calculate a current load and an average load, and controlling the generator to bear the average load and the high-capacity battery to bear a difference load between the current load and the average load.
摘要:
A lighting system (1) has a first lighting circuit (2) configured to provide a first predetermined level of lighting intensity. The first lighting circuit (2) is configured to receive power from a mains electricity supply (3) or from a battery source (4) if the mains supply is unavailable. The first lighting circuit (2) is connected to at least one first Light source (5) and configured, when actuated, to provide lighting at the first predetermined level of lighting intensity. At this time, the first light source is in either an on or off state or a level of light required to raise ambient light level above a predetermined level. The system (1) further has a second lighting circuit (13) configured to provide lighting at least a second predetermined level of lighting intensity. The second lighting circuit (13) is configured to receive power from the mains electricity supply (3) and is connected to at least one second light source (14). The second lighting circuit (13) has at least one sensor (18) with an input such that actuation thereof causes the second light source (14) to provide the second predetermined level of lighting intensity for a predetermined period of time, in response to ambient illumination meeting or exceeding a predetermined intensity, when said sensor has no input or has had no input for a predetermined period of time, or until re-set. In the system (1), the second predetermined level of lighting intensity is greater than said first predetermined level of lighting.
摘要:
A method of controlling an uninterruptible power supply system to increase component life includes decreasing a maximum output power limit of the uninterruptible power supply system when a temperature that the uninterruptible power supply system is experiencing has increased and increasing the maximum output power limit when this temperature has decreased. In an aspect, this temperature is ambient temperature of an equipment enclosure of the uninterruptible power supply system in which at least a rectifier and inverter of the uninterruptible power supply system are located. In an aspect, the method further includes upon the system going into an overload condition, determining an overload time limit based upon the temperature, the overload condition and an initial load condition. In an aspect, the method further includes upon the system going into a back-up power mode, determining a battery autonomy based upon the temperature.
摘要:
A wind turbine 275. The wind turbine 275 includes a blade pitch control system 520 to vary a pitch of one or more blades 200 and a turbine controller 500 coupled with the blade pitch control system 520. A first power source is coupled with the turbine controller 500 and with the blade pitch control system 520 to provide power during a first mode of operation. Uninterruptible power supplies 530 coupled to the turbine controller 500 and with the blade pitch control system 520 provide power during a second mode of operation. The turbine controller 500 detects a transition from the first mode of operation to the second mode of operation and causes the blade pitch control system 520 to vary the pitch of the one or more blades 200 in response to the transition.
摘要:
The control method, for a storage battery 100 provided in a consumer site receiving electric power supply from a system 104, includes: a first monitoring step of monitoring a first electric energy supplied from the system 104 per unit time period, where the unit time period is shorter than a predetermined time limit; a second monitoring step of monitoring a second electric energy supplied from the system 104 per predetermined time limit; a calculation step of obtaining a change over time in the first electric energy; and an instruction step of instructing the storage battery to discharge electric power to supply a load 108 located in the consumer site in accordance with the change over time in the first electric energy and with a peak value in the past pertaining to the second electric energy.