218results about "Constant-current supply dc circuit" patented technology

To provide an electronic component unit and a wire harness which can supply power properly to various apparatuses equipped in a vehicle.SOLUTION: An electronic component unit 10, which is applied to a wire harness, includes: a power source terminal 11 equipped in a vehicle and connected to a power source B2 for supplying power at a first voltage V1; a circuit branch part 13 connected to the power source terminal 11, the circuit branch part causing power supplied from the power source B2 to branch to a plurality of power source systems PL; and a voltage converter 15 removably provided to at least one of the power source systems PL in the circuit branch part 13, the voltage converter converting the voltage of power supplied from the power source B2 to a second voltage V2, which is lower than the first voltage V1, and outputting the second voltage V2.SELECTED DRAWING: Figure 6

To provide an electronic component unit and a wire harness which can supply power properly to various apparatuses equipped in a vehicle.SOLUTION: An electronic component unit 10, which is applied to a wire harness, includes: a power source terminal 11 equipped in a vehicle and connected to a power source B2 for supplying power at a first voltage V1; a circuit branch part 13 connected to the power source terminal 11, the circuit branch part causing power supplied from the power source B2 to branch to a plurality of power source systems PL; and a voltage converter 15 provided to at least one of the power source systems PL in the circuit branch part 13, the voltage converter converting the voltage of power supplied from the power source B2 to a second voltage V2, which is lower than the first voltage V1, and outputting the second voltage V2.SELECTED DRAWING: Figure 6

To provide an anti-theft device capable of preventing vehicle theft without affecting driving comfort. [Solution] The theft prevention device 10 includes a relay unit 12 connectable to a fuse box 100. The relay unit 12 includes a circuit breaker 70a and a control unit 28. The circuit breaker 70a includes a socket 22 having a pair of terminals 23a, a first wiring unit (wires 50d, 50f) electrically connected to one terminal 23a of the socket 22, a second wiring unit (wire 50e) electrically connected to the other terminal 23a of the socket 22, and a switching unit 32 provided in the first wiring unit and switching between energization and de-energization of the first wiring unit. The control unit 28 controls the switching unit 32 based on an operation signal from a remote control device 14.

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.

To suppress power consumption of an on-vehicle battery in a case in which power can be supplied from a post-attachment power source in a parking state of a vehicle.SOLUTION: An on-vehicle control device 10 includes a switching part 11, a control part 13, and a conducive path (for example, second conductive path 22). The switching part 11 is provided between an on-vehicle battery 2 mounted on a vehicle and a load (for example, first load 3), and is switched between an allowable state where power supply to the load from the on-vehicle battery 2 is allowed and a cut-off state where the power supply is cut off. The control part 13 controls the switching part 11. The conductive path is provided between the switching part 11 and the load, and can be electrically connected with a post-attachment power source 40. The control part 13 determines whether or not the post-attachment power source 40 is electrically connected to the conductive path in a parking state of the vehicle in a connection state, and exerts control such that when the control part 13 determines that the vehicle is in the connection state, the switching part 11 is in the cut-off state.SELECTED DRAWING: Figure 1

To provide an on-vehicle device or the like capable of efficiently determining a failure state of an opening / closing device.SOLUTION: An on-vehicle device includes: an opening / closing device provided on a power line from a power supply device mounted on a vehicle; and a control unit for controlling output of electric power of the opening / closing device to a downstream side in a flow direction of electric current from the power supply device by applying voltage to the opening / closing device, where the control unit acquires a current value corresponding to the electric power output from the opening / closing device to the downstream side, and determines whether or not the opening / closing device is in a failure state based on an application state of the voltage to the opening / closing device, the current value acquired from the opening / closing device, and an input current value due to the electric power supplied from the power supply device.SELECTED DRAWING: Figure 1

To handle an accident current of a DC bus by one DC circuit breaker.SOLUTION: A control unit (30) of a DC circuit breaker (1) includes: a first AD converter for a current and a second AD converter for a current that perform AD conversion of a current value flowing in a semiconductor cutoff unit (10) to derive a first digital current value and a second digital current value, respectively; and an AD converter for a voltage that performs AD conversion of a voltage value applied to a capacitor of a PN clamper (20) to derive a digital voltage value. The first AD converter for the current has higher AD conversion speed and lower resolution than the second AD converter for the current. When the first digital current value is equal to or greater than a fault current threshold value, the control unit (30) cuts off a main switch element of the semiconductor cutoff unit (10). When the digital voltage value is equal to or greater than a bypass voltage threshold value, the control unit conducts a bypass switch element of the PN clamper (20). When the first digital current value is less than an operation mode determination current threshold value, the control unit controls a surge energy consumption circuit of the PN damper (20) according to the second digital current value.SELECTED DRAWING: Figure 1

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

To suppress occurrence of inrush current when attaching a terminal of an electric power unit to an auxiliary machinery.SOLUTION: An electric power unit mounted on a vehicle to supply an auxiliary machinery with electric power comprises: a battery; a terminal which is connected to the auxiliary machinery; a current sensor which detects discharge current of the battery; a main circuit which includes a main relay and connects through the main relay between the battery and the terminal; a bypass circuit which includes a sub relay, bypasses through the sub relay the main relay and has a high resistance value compared with the main circuit; a processing circuit which controls the main relay and the sub relay based on a detection current value by the current sensor. The processing circuit turns off, when the detection current value is a first specified value or less during parking of the vehicle, the main relay and turns on the sub relay.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

To provide a power storage device which improves safety of a vehicle by securing a power source in the case of emergency.SOLUTION: A power storage device 50 comprises: a power storage cell 62, a current cutoff device 53 which cuts off a current I of the power storage cell 62; and a control unit 121. The control unit 121 cuts off the current by open-circuiting the current cutoff device 53 in a case where abnormality of the power storage device 50 is detected at the time of a vehicle crush, and restarts power supply to a crushed vehicle by close-circuiting the current cutoff device 53 in a case where the abnormality is not detected any more.SELECTED DRAWING: Figure 7

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.

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

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.

The present invention discloses a constant current power supply optical network power supply system and a power supply method. At least one constant current power supply device is arranged between a near-end constant current power supply device and a far-end constant current power supply device, and the input end of each constant current power supply device is connected in series and the output end is connected in parallel. In each constant current power supply device, one control module and at least two constant voltage conversion modules with input ends connected in series and output ends connected in parallel are arranged. The control module calculates the real-time total output power of the constant current power supply device according to the real-time output power of each constant voltage conversion module, so as to judge the power demand of the power-consuming device, and dynamically control the working state of each constant voltage conversion module in real time, so as to achieve the purpose of adaptively adjusting the rated operating total power of the constant current power supply device according to the power demand of the power-consuming device, effectively improve the power conversion efficiency of the constant current power supply device when supplying power to the outside in a wide power range, and reduce thermal power consumption.

To provide an on-vehicle power supply apparatus that can maintain supply of power from a power source to an important load and reduce dark currents which are consumed by a redundant function or the like, even when a defect occurs in the power source of a vehicle.SOLUTION: An on-vehicle power supply apparatus is provided with a main power supply part including a semiconductor switch IPD3 in a zone ECU 10 and a bypass circuit 14 which supply power from a power source of a main battery 21 or of a sub battery 23 to an important load 33 that regularly requires supply of power from the power source, from the zone ECU 10. The bypass circuit 14 has a bypass route bypassing the semiconductor switch IPD3, which can supply necessary power from the power source to the important load 33 even when the semiconductor switch IPD3 is in an OFF-state. Further the circuit can turn off the semiconductor switch IPD3 or the like while maintaining a function of the important load 33 to reduce dark currents, and suppress currents flowing into the important load 33 to the requisite minimum using a resistor 14a of the bypass circuit 14. The apparatus wakes up from a sleep state by detection of a busy state of a communication bus.SELECTED DRAWING: Figure 1

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