Electrical system for a vehicle which can be electrically driven
The invention relates to an electrical system (10a) for a vehicle which can be electrically driven, comprising a high-voltage DC system (12a) having a high-voltage DC energy store (14a); a low-voltage DC system (16a) with a low-voltage DC energy store (18a); a DC/DC converter (20a) which is electrically connected or can be electrically connected to the high-voltage DC system (12a) at one end and to the low-voltage DC system (16a) at the other end; a first DC/AC converter (22a) and an AC line passage (24a) which is electrically connected or can be electrically connected to said first DC/AC converter, wherein the first DC/AC converter (22a) is electrically connected or can be electrically connected to the high-voltage DC system (12a) at one end and to an AC drive device (26a) of the vehicle by means of the AC line passage (24a) at the other end; and a DC energy source (28a), in particular a fuel cell device for example. A second DC/AC converter (40a) which is electrically connected or can be electrically connected to the DC energy source (28a) at one end and to the AC line passage (24a) at the other end is provided according to the invention.
Publication number: WO2016041711A1 | Search similar patents
Ac/ac and ac/dc reversible electrical energy conversion system
The invention relates to a conversion system able to reversibly convert an AC voltage at high frequency and/or at variable frequency (3) either into an AC voltage at a predetermined frequency (5) or into a DC voltage (9). The conversion system comprises a matrix of controlled switches (8) comprising means for connection for each type of voltage.
Publication number: WO2015185319A1 | Search similar patents
Power supply device
A battery mounted on a vehicle is efficiently charged using a commercial power supply while suppressing increase in weight.A power supply device is provided with: a first conversion circuit (11) the DC-side terminal of which is connected with a first DC power supply and the AC-side terminal of which is connected with a primary coil of a transformer; a second conversion circuit (12) the AC-side terminal of which is connected with a secondary coil of the transformer and the DC-side terminal of which is connected with a second DC power supply; and a control circuit (10) which controls opening and closing of switching elements configuring the first and second conversion circuits.� AC power supplied to the AC-side terminal of the first conversion circuit is supplied to the first or second DC power supply.
Publication number: WO2010143304A1 | Search similar patents
Charging/discharging control system for electricity storage device
This charging/discharging control system (10) for an electricity storage device is provided with: a motor/generator (13); an electricity storage device (14); an AC/DC conversion unit (15) that performs AC/DC conversion processing between the AC power of the motor/generator (13) and the DC power of the electricity storage device (14); and a control device (12) that controls the charging/discharging of the electricity storage device (14) via the AC/DC conversion unit (15). During charging control, in accordance with the charging state of the electricity storage device (14), the control device (12) limits the magnitude of the DC power supplied to the electricity storage device (14) by converting the power generated when braking the motor/generator (13).
Publication number: WO2015079605A1 | Search similar patents
Flyback ac-dc conversion device and conversion method thereof
A flyback AC-DC conversion device and a conversion method thereof. The device contains a rectifier circuit (R), an electronic switch (SW), a flyback transformer (10) and an automatic charge pumping circuit (20), wherein the flyback transformer (10) is provided with a primary side and a secondary side, wherein the primary side is electrically connected to the rectifier circuit (R) and the electronic switch (SW); and one side of the automatic charge pumping circuit (20) is electrically connected to the secondary side of the flyback transformer (10), and the other side thereof is electrically connected to a load (200), so as to improve the conversion efficiency of a power source and be capable of restraining the ripple of an output voltage. Additionally, further disclosed is a power source conversion method for the flyback AC-DC conversion device.
Publication number: WO2015078095A1 | Search similar patents
Ac-dc conversion circuit
An alternating current (AC)-direct current (DC) conversion circuit, comprising an input module, a rectifier module, a transformer module, an output module, a voltage detection module and a control module; the voltage detection module is used to detect the DC voltage outputted by the rectifier module; the control module is used to control the operation of the AC-DC conversion circuit. The voltage detection module and the control module are provided to prevent AC-DC conversion circuit damage and unstable voltage output.
Publication number: WO2016015356A1 | Search similar patents
An air-conditioning system for a vehicle
An air-conditioning system for a vehicle includes a generator (11) driven by an engine (10) for the vehicle, a control circuit (2) for controlling the output voltage and current for the generator, and an electric refrigeration compressor (22) controlled by the circuit. The control circuit also includes a voltage and current regulating circuit (20). The compressor can be a DC electric compressor, or an AC electric compressor, or an AC frequency conversion compressor, or a DC frequency conversion compressor. When the compressor is an AC frequency conversion compressor, the circuit is an AC frequency conversion control circuit. When the compressor is a DC frequency conversion compressor, the circuit is a DC frequency conversion control circuit.
Publication number: WO2007006207A1 | Search similar patents
Motor drive device
The present invention relates to a motor drive device for driving an AC motor (3) by converting the DC voltage of a battery (2) to an AC voltage using a power conversion circuit. The motor drive device includes a full bridge circuit (10) which is constituted by a plurality of legs connected in parallel, the plurality of legs having semiconductor switching elements (101) respectively at the upper and lower arms. While the full bridge circuit (10) is connected to an AC power source (1), a high-frequency AC voltage output from the full bridge circuit (10) is converted to a DC voltage through a transformer (21) and an AC/DC conversion circuit (11) to charge the battery (2). Further, while the AC power source (1) is cut off from the full bridge circuit (10), the DC voltage of the battery (2) is converted to an AC voltage through the full bridge circuit (10) and the AC voltage is supplied to the AC motor (3). Thereby, the power conversion circuit for driving a motor is also used for charging a battery while the transformer (21) for insulation is set to be driven at high frequency, and thus the overall device can be reduced in size and manufactured at low cost.
Publication number: WO2013168491A1 | Search similar patents
Energy conversion system
The purpose of the present invention is to improve the shape of AC voltage waveform, in an energy conversion system capable of performing conversion between DC power and AC power, and conversion between AC power and mechanical force. Accordingly, the present invention is provided with: a plurality of DC/AC conversion circuits which have DC voltage applied thereto, which are each formed from a full-bridge circuit provided with four switching elements, and which convert direct current into alternating current; and a rotational electric machine or a linear motor provided with a plurality of AC input/output terminals which are insulated from each other. DC input/output terminals of the plurality of DC/AC conversion circuits are respectively connected in series. AC input/output terminals of the DC/AC conversion circuits are respectively connected, either directly or via transformers, to the plurality of AC input/output terminals of the rotational electric machine or the linear motor, said plurality of AC input/output terminals of the rotational electric machine or the linear motor being insulated from each other. When switching the switching elements in the DC/AC conversion circuits ON and OFF, phases such as that obtained by switching three or more of the four switching elements ON are formed.
Publication number: WO2015045013A1 | Search similar patents
High voltage on-board network structure for vehicles
A power supply system (2) for vehicles, comprising an electric machine (6), a DC-AC converter (8) having a DC connection and an AC connection, and an energy storage element (4) wherein the energy storage element (4) can be connected to the DC connection and the electric machine (6) can be connected to the AC connection, wherein the electric machine (6) can be operated using the energy stored in the energy storage element (4), characterised in that a DC-DC converter (14) is arranged between the energy storage element (4) and the converter (8) and an external power supply (12) can be coupled into the DC-DC converter (14) for charging the energy storage element (4) wherein the DC-DC converter (14) can be uncoupled from the converter (8) in the event of power supply.
Publication number: WO2014180606A2 | Search similar patents
Power control device, power control method, program, and energy management system
The present invention pertains to a power control device, a power control method, a program, and an energy management system that are configured so as to be capable of more efficiently using generated power. The power control device comprises: a first conversion device that DC/DC converts DC power from a power generation unit that utilizes natural energy and generates power, and outputs same; a second conversion device that DC/DC converts the output power from the first conversion device, charges a storage unit that stores power, DC/DC converts the power from the storage unit, and discharges said power; a third conversion device that DC/AC converts either or both the output power from the first conversion device and the discharge power from the second conversion device, and supplies AC power to a power grid and an AC load; and a control unit that controls the driving of the first to third conversion devices. The control unit discharges the second conversion device such that the output power from the third conversion device is greater than the power consumed by the AC load. The present invention can be applied, for example, to a power conditioner.
Publication number: WO2014103352A1 | Search similar patents
Power conversion system, power conversion device, and method for determining status of electricity-storage device
[Problem] To make it more convenient to determine the status of an electricity-storage device. [Solution] This power conversion system (1) includes an AC-to-DC converter (20) that converts AC power from an AC power supply (10) to first DC power, a DC-to-DC converter (50) that converts the first DC power from the AC-to-DC converter (20) to separate second DC power that has a different power value, and an electricity-storage device (70) that stores the second DC power from the DC-to-DC converter (50). The DC-to-DC converter (50) has a control-signal generation unit (110) that superimposes an AC voltage onto the DC voltage of the second DC power and/or superimposes an AC current onto the DC current of the second DC power, a detection/signal-processing unit (200) that obtains a detected second DC voltage (V2) with the aforementioned AC voltage superimposed thereon and/or a detected second DC current (I2) with the aforementioned AC current superimposed thereon, and a status determination unit (120) that determines the status of the electricity-storage device (70) on the basis of the detected second DC voltage (V2) and/or detected second DC current (I2).
Publication number: WO2015125279A1 | Search similar patents
Power conversion device for electric locomotive
An isolation transformer in the power conversion device of an embodiment used for an electric locomotive receives the supply of a high-voltage AC power from an AC feeder and converts the high voltage to a low voltage, thereby outputting a low voltage AC power. An AC/DC converter receives the low voltage AC power and converts AC to DC, thereby outputting the DC to an inverter. Meanwhile, a PWM control unit outputs a PWM control signal to the inverter, said PWM control signal having a predetermined pattern for removing a specific harmonic component from the output of the inverter or attenuating the specific harmonic component to a predetermined level or less. A voltage control unit controls the output DC voltage of the AC/DC converter. As a result, the inverter receives the output signal of the AC/DC converter, converts DC to AC under the control of the voltage control unit, and supplies the AC to a load, so that the power conversion device for the electric locomotive, including an APU circuit, can be reduced in size.
Publication number: WO2015060000A1 | Search similar patents
Power conversion device
A power conversion device uses a plurality of magnetically coupled coils to distribute input power in a multiple output manner in accordance with a power request from a load. When supplying power from an AC power supply (1), at least one of an AC/DC converter (2) and first to fourth switching circuits (4, 8, 13, 30) controls the voltage at the output side of the AC/DC converter (2) according to the deviation of the detected value of the voltage from the target value of the voltage. When supplying power from a first DC voltage source (11) or a second DC voltage source (34), the second switching circuit (8) between the first DC voltage source (11) and a transformer (6) or the fourth switching circuit (30) between the second DC voltage source (34) and the transformer (6) supplies the power according to an arbitrary time ratio.
Publication number: WO2015060255A1 | Search similar patents