8results about "Constant-current supply dc circuit" patented technology

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

To limit a current flowing from a power path into a first conducting path to an upper-limit current value or less by controlling a charging operation of a charging section provided on a second conducting path which branches from the first conducting path.SOLUTION: An auxiliary power unit 60 includes: a first conducting path 61 through which a current supplied from a power path 30 flows; a second conducting path 62 and a third conducting path 63 which branch from the first conducting path 61; a charging section 64 that performs at least a charging operation of supplying a charging current to a power storage section 40 based on power supplied from the second conducting path 62; and a control unit 65 that controls the charging section 64. The control section 65 makes the charging section 64 perform the charging operation so as to limit the current flowing from the power path 30 to the first conducting path 61 to an upper-limit value or less.SELECTED DRAWING: Figure 1

A direct-current bus control system is provided for controlling power variation in a DC bus connecting an input power source and a load, including: a main stabilizer including a first charge / discharge element and a first power converter; and a plurality of sub-stabilizers each including a second charge / discharge element, a charge element, or a discharge element, and a second power converter. The plurality of sub-stabilizers include a first sub-stabilizer and a second sub-stabilizer including the charge element. When the voltage of the DC bus is higher than a first charge threshold, the second power converter of the first sub-stabilizer supplies a current equal to a current target value obtained by the second power converter of the first sub-stabilizer from the DC bus to the charge element of the first sub-stabilizer.

To realize a power supply and method for supplying direct current to a load. [Solution] Direct current (I DC The power supply (100) for supplying power to the ) has an input voltage (V AC An input voltage terminal (101) for receiving ) and a DC current (I DC A DC voltage terminal (102) for supplying the load, and an input voltage (V AC ) to the DC voltage (V) of the DC voltage terminal DC The power supply comprises an input voltage converter (103) configured to convert to ), and a capacitor (104) connected to the DC voltage terminal to accommodate the initial peak current needs of the load. To accommodate the continuous portion of the peak current needs of the load, the power supply comprises a supercapacitor (105) and the DC voltage (V) of the supercapacitor located between the supercapacitor and the DC voltage terminal. DC_S ) and the DC voltage (V) of the DC voltage terminal DC The system comprises a DC voltage converter (106) configured to perform voltage conversion between and ).

To provide a power conversion device which parallels off only a switch of a breaking part just above a short-circuit part without causing unnecessary power outage.SOLUTION: A power conversion device includes: a power converter which is provided between a power supply part and a plurality of breaking parts provided so that a breaking current value decreases as one progresses from an upstream to a terminal end of a power distribution system and converts power supplied from the power supply part to output DC power; and a control part which increases output current so that the breaking parts are paralleled off in order from the breaking part with the smallest breaking current value after output current of the power converter is lowered below the lowest breaking current value in the breaking current values required for opening the switches of the plurality of breaking parts when a short-circuit accident occurs in the power distribution system.SELECTED DRAWING: Figure 2

To realize a DC circuit breaker that properly interrupts the current when a large current flows and needs to be interrupted.SOLUTION: A DC circuit breaker (1) has a series-connected semiconductor switch (2) and a first switch (3), a first voltmeter (7) that measures the voltage on the secondary side of the semiconductor switch, and an ammeter (6) that measures the current flowing through the semiconductor switch, and the semiconductor switch is turned off when the first voltmeter detects a voltage below a predetermined value until after a predetermined time has passed since the ammeter detected a predetermined current value or higher.SELECTED DRAWING: Figure 1

To provide a power transfer system which can stop operation of slave units when a master unit is down while power transfer is balanced between a plurality of slave units.SOLUTION: A power transfer system S includes: a master unit 1 which is connected to a DC bus B and controls bus voltage of the DC bus B; a slave unit 2A which is connected to the DC bus B and supplies power to the DC bus B; and a slave unit 2B which is connected to the DC bus B and receives power from the DC bus B. The master unit 1 measures a transfer amount A1 of current or power between itself and the DC bus B, and when a measurement result of the transfer amount A1 is less than a threshold which is previously set, controls the bus voltage so as to be prescribed first set voltage, and when the measurement result of the transfer amount A1 is equal to or more than the threshold, controls the bus voltage to be prescribed second set voltage. The slave unit 2A measures the bus voltage, and when the measurement result of bus voltage is the first set voltage, performs operation to temporarily increase / decrease a transfer amount A2 between the slave unit 2A and the DC bus B.SELECTED DRAWING: Figure 1

This application provides a dual-power supply system for a high-voltage lighting system for tethered drones, belonging to the field of tethered drone technology. The system includes a ground unit, a tethered drone, a tether cable, and a high-voltage lighting system. The ground unit includes a switching power supply module and a main control module, with the main control module connected to the switching power supply module. The switching power supply module is connected to both the tethered drone and the high-voltage lighting system via the tether cable, with the high-voltage lighting system fixed to the tethered drone. The switching power supply module converts the input AC power into two output power links: one is a constant voltage output link, and the other is a constant current output link. The constant voltage output link provides the first high-voltage power to sustain flight for the tethered drone, while the constant current output link provides the second high-voltage power to the high-voltage lighting system. The main control module controls the output voltage and current of the constant voltage output link. This solution reduces power supply interference, energy consumption, and weight.