142results about "Constant-current supply dc circuit" patented technology

A direct current (DC) microgrid is provided. The microgrid includes a power converter, a power-voltage (PV) droop control loop, and an inner current control loop of the power converter. The PV droop control loop is configured to receive measurements of a droop current quantity that is not a DC bus current of the DC microgrid. The droop current quantity is used to determine a droop power quantity selected as a power quantity in a PV relationship. The PV droop control loop is further configured to derive a current reference based on droop in the droop power quantity. The inner current control loop is configured to control operation of the power converter by deriving a measured current corresponding to the control quantity based on the measurements of the droop current quantity, directly comparing the current reference with the measured current, and generating switching signals of switches in the power converter.

The utility model discloses a current stabilization control system for connecting a photovoltaic direct current to an electrolytic aluminum direct current bus. The current stabilization control system for connecting the photovoltaic direct current to the electrolytic aluminum direct current bus comprises an electrolytic aluminum power supply rectification part and a photovoltaic station part, the photovoltaic station part further comprises a photovoltaic monitoring system which is connected with all Hall current sensors and a current stabilization control system in the photovoltaic station part and the electrolytic aluminum power supply rectification part. All Hall current sensors in the photovoltaic field station part and the electrolytic aluminum power supply rectification part are used for measuring current data at different positions and sending the current data to the photovoltaic monitoring system, and the photovoltaic monitoring system carries out mutual verification and comparison on the current data, gives an alarm when the current data exceed the limit, and is also used for carrying out communication and interaction with the current stabilization control system. According to the utility model, accurate, safe and reliable operation of the current stabilization control system for accessing the photovoltaic direct current into the electrolytic aluminum direct current bus can be realized, and the constant current of the electrolytic aluminum direct current bus is further maintained.

To provide a power supply switching circuit capable of maintaining the operation of a circuit without any malfunction.SOLUTION: A power supply switching circuit 101 is connected to a first power source 210 and a second power source 220, and is also connected to a first circuit 310 and a second circuit 320. The power supply switching circuit includes a first main path 1m, a second main path 2m, a first switching path 3, and a second switching path 4. The power supply switching circuit also includes a control circuit 20 that forms a power supply path by controlling each of the first main path, the second main path, the first switching path, and the second switching path to either a conductive state or a non-conductive state. When a malfunction occurs in one of the first and second circuits, the control circuit forms a power supply path that does not affect the operation of the other circuit.SELECTED DRAWING: Figure 1

The power supply capacity of the entire system can be increased.SOLUTION: The load control system includes a main line cable 9 including a power supply line for supplying DC power to a plurality of load control systems 20, a plurality of branch means provided for each load control system 20 for branching the power supply line, and a plurality of power supply lines provided for each load control system 20 and connected to the power supply line branched by the branch means. A power supply system 100 includes a plurality of branch line cables 17 that supply DC power to a load control system 20, and a plurality of power supply devices 10 each including a generation unit 110 that generates DC power from AC power, a first connection terminal 13 that is connected to the generation unit 110 and to which a main line cable 9 can be connected, and a second connection terminal 14 that is connected to the generation unit 110 and the first connection terminal 13 and to which the main line cable 9 can be connected.SELECTED DRAWING: Figure 2

In a power supply whose connection state can be changed, this enables easy switching of the connection state with a simple configuration. [Solution] The system comprises a first power supply unit 110 and a second power supply unit 110 capable of supplying DC power and changing the output voltage; a first connector 120 connected to the first power supply unit 110; a second connector 120 connected to the second power supply unit 110; an information acquisition unit 140 that acquires connection information including at least one of the following regarding the external connection status to the first connector 120 and the second connector 120: information that identifies the first connector 120 and the second connector 120 as being connected in series; information that identifies the first connector 120 and the second connector 120 as being connected in parallel; and a control unit 150 that controls the first power supply unit 110 and the second power supply unit 110 based on the connection information.

To solve the imbalance among outputs of a plurality of power source vehicles the DC outputs of which are connected, irrespective of the configurations of the power source vehicles or the configuration of wiring of a load.SOLUTION: A power distribution control device includes an output information acquisition unit that acquires, from power source vehicles the DC outputs of which are connected, output information indicating the respective DC outputs of the power source vehicles, and a control parameter calculation unit that calculates, for each of the power source vehicles, a control parameter for equalizing the DC outputs from the output information on the power source vehicles. The power distribution control device transmits the control parameter to a vehicle control device provided in each of the power source vehicles and configured to be able to control an output voltage. Accordingly, the control parameter is given to droop control which is performed by the vehicle control device.SELECTED DRAWING: Figure 5

A plurality of DC power supply apparatuses which are CVCC power supplies have output sides connected in parallel to a load. In each of the plurality of DC power supply apparatuses, an upper limit current maintained in a CC mode is designed to be equal to or lower than a rated current. Output voltages from the plurality of DC power supply apparatuses are actually different from equivalently set reference voltages Vr, due to variation within an allowable voltage range of the load 120. The plurality of DC power supply apparatuses operate to supply currents, as being accompanied by transition from a CV mode to the CC mode, sequentially in the descending order of magnitude of actual output voltages thereof, with increase in output current to the load.

To provide an intermittent driving device for realizing a system for supplying power at a fixed frequency in terms of hardware without depending on software.SOLUTION: The intermittent driving device 5 includes a first power output section 15, a first capacitor 7, a trigger power output section 20, a trigger power input section 21 electrically connected to the trigger power output section 20, a second capacitor 8 electrically connected to the trigger power output section 20 and the trigger power input section 21, a load switch 35, a second power output section 23 for supplying power to the driven device 100, a circulating power line 45 for circulating part of the power supplied from the second power output section 23 to the second capacitor 8, and a voltage dividing circuit 50 electrically connected to the second capacitor 8. The load switch 35 electrically connects the first power output 15 to the second power output 23 when the voltage at the trigger power input 21 is higher than a switching threshold.SELECTED DRAWING: Figure 1

This control device is used for performing a control on a DC power feeding system in which a plurality of hubs are connected with feeders, said plurality of hubs having at least a first hub equipped with a first power feeding device and a second hub equipped with a second power feeding device and a load device. The control device comprises: an information acquiring unit that acquires information of the bus between the second power feeding device and the load device; a determination unit that determines, on the basis of the information and a threshold value, whether or not to perform a voltage control in the DC power feeding system; and a control unit that, when it is determined by the determination unit that the control is performed, performs the voltage control on at least either the first power feeding device or the second power feeding device.

Operation unit for photovoltaic power generation, photovoltaic power generation stop system using the same, photovoltaic power generation system, and photovoltaic power generation method, capable of suppressing electric shock and fire caused by a photovoltaic power generation panel due to an earthquake and flood damage, and taking into consideration that a correct operation for stopping power generation is performed by preventing an operator's erroneous operation SOLUTION: An operation unit for a hybrid switch that is connected between terminals of a module or a string of a photovoltaic panel to obtain an output and short-circuits the terminals to stop the output includes a first manual switch corresponding to the hybrid switch, a seismic sensor, a water level sensor, a control unit that short-circuits the terminals in the hybrid switch under a predetermined condition, a second manual switch that restarts photovoltaic power generation from DC interruption by the control unit, and a display element that displays that power is being generated.SELECTED DRAWING: Figure 2A

This technology provides a way to prevent power supply shortages to specific loads. [Solution] The vehicle power supply unit 20 includes a control unit 35. When the first detection target, which is at least one of the voltage value of the first conductive path 15 and the current value flowing through the first conductive path 15, falls below a first threshold V1, the control unit 35 controls the switching unit (e.g., third voltage conversion unit 23) to a second state and switches all or part of the switch units (e.g., switch units 33, 34) provided in response to loads (e.g., first load 13, second load 14) among a plurality of first loads 12, 13 and at least one second load 14, excluding a specific first load (e.g., first load 12), to an off state.

To provide a power supply control device and a computer program that enable appropriate handling in accordance with an added or exchanged new on-vehicle machine.SOLUTION: Provided is a vehicle power supply control device that controls power supply to an on-vehicle machine, including: a switch that interrupts power supply to the on-vehicle machine; and a control unit that acquires, from the newly connected new on-vehicle machine, new apparatus information related to the new on-vehicle machine and performs open / close control over the switch based on the acquired new apparatus information.SELECTED DRAWING: Figure 2

To provide a technique capable of promoting miniaturization of a device while stably securing power at inspection of an inspection object.SOLUTION: An inspection device electrically inspects an inspection object. The inspection device comprises: a power supply module that supplies power to be used for the inspection; a secondary battery that is separately provided from the power supply module, and can charge and discharge power; and a power control circuit that electrically connects the power supply module, the secondary battery, and the inspection object. In addition, the inspection device comprises: a switch part that is provided in the power control circuit, and can switch a connection state of the power supply module, the secondary battery, and the inspection object; and a control part that sets the power to be used for the inspection, and controls the connection state of the switch part on the basis of the set power.SELECTED DRAWING: Figure 5

To provide an on-vehicle device, etc., capable of efficiently performing power supply-related processing on an on-vehicle ECU handling a service that is performed in a vehicle.SOLUTION: An on-vehicle device is installed in a vehicle, and is communicably connected to an on-vehicle ECU connected to an on-vehicle network. The on-vehicle device includes a control unit that performs processing related to power supply to the on-vehicle ECU. The control unit obtains a current value in the on-vehicle ECU handling a service that is performed in the vehicle, obtains a usable capacity that can be used in a power source device installed in the vehicle when the service is performed, determines whether or not to continue power supply to the on-vehicle ECU handling the service on the basis of the obtained usable capacity and current value, and performs processing related to the power supply in accordance with the determination result.SELECTED DRAWING: Figure 1

The charging control apparatus according to the present disclosure includes a voltage sensor configured to detect the voltage of a battery cell and a controller configured to execute an intermittent charging process to alternately repeat a charging mode and a resting mode for the battery cell. Under the condition that the charging mode is switched to the resting mode while the intermittent charging process is being executed, the controller is configured to execute: an operation of determining an internal resistance of the battery cell based on an amount of change in voltage of the battery cell in a resting period where the resting mode continues; and an operation of recording the internal resistance in association with SOC of the battery cell.

To easily switch the connection state of a power supply whose connection state is changeable with a simple configuration. [Solution] The device comprises a first power supply unit 110 and a second power supply unit 110 capable of supplying DC power and changing the output voltage, a first connector 120 connected to the first power supply unit 110, a second connector 120 connected to the second power supply unit 110, an information acquisition unit 140 that acquires connection information regarding the external connection state of the first connector 120 and the second connector 120, the information including at least one of information specifying that the first connector 120 and the second connector 120 are connected in series, information specifying that the first connector 120 and the second connector 120 are connected in parallel, and information specifying that the first connector 120 and the second connector 120 are not connected, and a control unit 150 that controls the first power supply unit 110 and the second power supply unit 110 based on the connection information.

A power supply (100) for feeding direct current (IDC) to a load (109) comprises an input voltage terminal (101) for receiving input voltage (VAC), a direct voltage terminal (102) for supplying the direct current (IDC) to the load, an input voltage converter (103) configured to convert the input voltage (VAC) to direct voltage (VDC) of the direct voltage terminal, and a capacitor (104) connected to the direct voltage terminal to respond to beginnings of peak current needs of the load. To respond to continuation sections of the peak current needs of the load, the power supply comprises a super-capacitor (105) and a direct voltage converter (106) between the super-capacitor and the direct voltage terminal and configured to carry out voltage conversion between direct voltage (VDC_S) of the super-capacitor and the direct voltage (VDC) of the direct voltage terminal.

To suppress cost and to protect a wire from a temperature rise of the wire.SOLUTION: A protection device is a protection circuit which cuts off current flowing from a switch installed between a power supply and a load to the load via the wire, and includes: a current measurement part for measuring current flowing in a shunt resistor connected in series with the wire; and a determination part for turning the switch on or off on the basis of current measured by the current measurement part. The shunt resistor has the same temperature at energization as the wire when temperature characteristics are approximately the same as the wire and an environment temperature is equal to the environment temperature of the wire. The determination part turns off the switch when a current value measured by the current measurement part is equal to or higher than a threshold which is previously determined from an environment temperature upper limit of the wire, a wire limit temperature of the wire and the temperature characteristics of the shunt resistor.SELECTED DRAWING: Figure 1

To increase power transmission efficiency.SOLUTION: A host power management device 3 includes an acquisition unit 32, an update unit 33, and an output unit 34. The acquisition unit 32 obtains a received power value of power received by a first power supply system that makes a power transmission request, and a power transmission value of power transmitted by a second power supply system that responds to the power transmission request. The update unit 33 updates an object target value based on the received power value and the power transmission value. The object target value includes at least one of a reception power target value of an external bus voltage in a first converter that can bidirectionally convert between the external bus voltage and a first internal bus voltage supplied to a first internal DC bus in the first power supply system, and a power transmission target value of the external bus voltage in a second converter that can bidirectionally convert between the external bus voltage and a second internal bus voltage supplied to a second internal DC bus in the second power supply system. The output unit 34 outputs a first setting instruction for setting the reception power target value to the first converter, and a second setting instruction for setting the power transmission target value to the second converter.SELECTED DRAWING: Figure 4

To provide an electronic apparatus which acquires power from a power supply device via a relay device and can acquire appropriate power from the relay device.SOLUTION: The electronic apparatus includes a connection unit configured to be connectable to an external apparatus, a power receiving unit configured to receive power supply from the external apparatus via the connection unit, a communication unit configured to communicate with the external apparatus, and a control unit. The communication means requests the external device to change an output setting from a first setting to a second setting when the output setting, which is a setting of power output in the external device, is the first setting. The control means controls the operation of each component so as to make power consumption of the electronic apparatus less than a specific amount in a period until the output setting is changed from the first setting to the second setting.SELECTED DRAWING: Figure 1

The present application relates to the technical field of underwater power supply, and provides a long-distance underwater power supply system applicable to a seabed observation system including a plurality of load nodes. [Solution] The power supply system includes at least one terminal power source and a plurality of branch nodes, the terminal power source being electrically connected to the plurality of branch nodes in sequence via a trunk cable, the terminal power source being capable of outputting a constant current to the trunk cable, the plurality of branch nodes being respectively connected to at least one corresponding load node, each branch node and the corresponding load node being respectively connected to an undersea earth, and the branch nodes being capable of converting the constant current transmitted through the trunk cable into a constant voltage current and outputting the constant voltage current to the load node.

Automatically configures a set of packet energy transmission operation parameters. [Solution] A set of packet energy transmission operation parameters is automatically configured to optimize safety, efficiency, and / or resilience in a digital power system. A set of limits is configured for packet energy transmission operation that does not immediately preclude the safe operation of the transmission line, and each limit in the set specifies a constraint for at least one of the measurements and calculations based on the impedance in series or parallel with the transmission line, the operating efficiency of the digital power system, and / or the voltage or current signal integrity. When the operation of the transmission line is measured and compared to the limits, and at least one of the limits is exceeded, the set of limits is automatically reconfigured or a new configuration is generated based on which limit was exceeded. Measurement, comparison, and reconfiguration are repeated until an acceptable operating range is identified or until a predetermined time limit is exceeded.

The invention relates to a method and a power supply for providing direct current to a load. A power supply (100) for feeding a direct current (IDC) to a load (109) comprises an input voltage terminal (101) for receiving an input voltage (VAC), a direct current voltage terminal (102) for providing the direct current (IDC) to the load, an input voltage converter (103) configured to convert the input voltage (VAC) to a direct current voltage (VDC) of the direct current voltage terminal, and a capacitor (104) connected to the DC voltage terminal in response to a load peak current demand. In response to a continuous section of load peak current demand, the power supply includes a supercapacitor (105) and a DC voltage converter (106) between the supercapacitor and the DC voltage terminal, the DC voltage converter configured to voltage convert between a DC voltage (VDCS) of the supercapacitor and a DC voltage (VDC) of the DC voltage terminal.

An electrical bicycle electrical system includes a battery, various accessories and an electrical power distribution module. The electrical power distribution module includes a control device, various accessory modules and a voltage convertor module. The electrical power distribution module operates to convert the bicycle battery voltage to the corresponding voltages of the bicycle accessories which are commonly lower than the battery voltage. The electrical power distribution module adapts to a variety of different bicycles, manufactured by different manufacturers, allowing users to replace the manufacturer's engine control unit to fit their application.

To provide a railroad vehicle storage battery system in which the number of contactors required to suppress cross current between storage battery groups or storage battery boxes is minimized.SOLUTION: A railroad vehicle storage battery system forms a battery pack and includes one or more storage battery boxes in which a plurality of storage battery groups connected in parallel are housed, a parallelization control unit that maintains the equalized voltages of the plurality of storage battery groups, and group switch devices that are disposed in the storage battery boxes, are connected in series with at least one pole of the corresponding storage battery group, and are provided for the respective groups. The system includes one box switch device that is connected in series with a connection point where the plurality of storage battery groups are connected in parallel at a pole opposite to the pole with which the group switch devices are connected in series. The parallelization control unit establishes parallel connection between the storage battery groups in the storage battery boxes by closing the group switch devices, and establishes parallel connection between the storage battery boxes by closing the group switch devices and the box switch device.SELECTED DRAWING: Figure 4

The invention belongs to the technical field of power electronic equipment, and particularly provides an active damping constant-power control method for a common-high-frequency-link direct-current transformer and a medium, and the method comprises the steps: firstly obtaining a port direct-current side current i2 at a constant-power operation mode port of the common-high-frequency-link direct-current transformer; in the active damping constant-power controller, port direct-current side current i2 at a constant-power operation mode port is used as input, and an output value yc is obtained after the port direct-current side current i2 passes through an active damping unit; after the port current error ei2 passes through a PI regulator, an output value yc of the active damping unit is superposed to obtain an intermediate quantity yd; and finally, amplifying the intermediate quantity yd through a gain amplification unit to generate a phase shift ratio d2 of the constant-power operation mode port, and outputting the phase shift ratio d2 to the constant-power operation mode port to control the constant-power operation mode port to operate. According to the scheme, on the premise that the actual line resistance is not additionally changed and the loss is not increased, the operation stability of the common-high-frequency-link direct-current transformer can be effectively improved, and low-frequency oscillation is restrained.

To provide a control system for enabling energy saving.SOLUTION: A control system controls autonomous traveling of an autonomous transport device Ma to which power is supplied from a power generation unit 9 for generating power by receiving sunlight, in order to accommodate an article requiring cold storage in a transport chamber 20 and transport the article by the autonomous traveling. A processor included in the control system executes: acquiring incident information on incidence of the sunlight onto the autonomous transport device Ma; and adjusting a traveling attitude of the autonomous transport device Ma during the autonomous traveling to a control attitude Ac in which, with respect to a light-receiving surface 92 directed according to the incident information in a sun direction Ds for receiving the sunlight in the power generation unit, the transport chamber 20 is located in a reverse direction Dr to the sun direction Ds.SELECTED DRAWING: Figure 6

To accurately create an operation plan for achieving efficient operation in a hydrogen system.SOLUTION: According to an embodiment, in a hydrogen system operation planning device, an acquisition unit is configured to acquire performance data related to performance of a plurality of hydrogen producing apparatuses, and tentative operation plan data related to a tentative operation plan tentatively created for an operation plan. A prediction unit is configured to acquire performance prediction data by predicting the performance of the plurality of hydrogen producing apparatuses during a plan object period on the basis of the performance data and the tentative operation plan data acquired by the acquisition unit. A planning unit is configured to acquire an operation plan by correcting the tentative operation plan on the basis of the performance prediction data acquired by the prediction of the prediction unit.SELECTED DRAWING: Figure 2

This technology provides a way to prevent power supply shortages to specific loads. [Solution] The vehicle power supply unit 20 includes a control unit 35. When the first detection target, which is at least one of the voltage value of the first conductive path 15 and the current value flowing through the first conductive path 15, falls below a first threshold V1, the control unit 35 controls the switching unit (e.g., third voltage conversion unit 23) to a second state and switches all or part of the loads (e.g., first load 13, second load 14) of the plurality of first loads 12, 13 and at least one second load 14, excluding a specific first load (e.g., first load 12), to a power-saving state.

Method for managing an electrical circuit of a motor vehicle. Management method comprising: - a high-voltage electrical source (1), having a positive pole and a negative pole, - a branch (2) of the high-voltage electrical circuit supplying at least one high-voltage component, a first end (21) of said branch being connected to the positive pole via a first contactor (4), a second end (22) of said branch being connected to the negative pole via a second contactor (5), the first and second contactors (4, 5) being independently controllable to open or close, the method comprising increasing a voltage between the first and second ends, and selecting the given contactor, including executing alternating logic between the first and second contactors so as to increase the lifetime of an assembly consisting of the first and second contactors. Figure for the abstract: 1