Abstract:
The invention relates to a variable-frequency drive that includes a DC power supply bus with a positive line (16) and a negative line (17), an inverter module (14) powered by the DC bus for supplying a variable voltage to an electric load (M). The inverter includes a first DC/DC converter (20) having output terminals (20b) connected in series on the positive line (16) of the DC bus, a second DC/DC converter (30) having input terminals (30b) connected between the positive line (16) and the negative line (17) of the DC bus, a filtering capacitor (Cf) connected in parallel to the input terminals (20a) of the first converter (20) and to the first output terminals (30b) of the second converter (30), and an electric power storage module (Cs) connected in parallel to the second output terminals (30c) of the second converter (30).
Abstract:
A system and method for driving an electric vehicle is provided. The system has, for example, a power source generating a voltage, a voltage converter, a control system, and one or more motors for driving or propelling the vehicle. The voltage converter is configured to accept an input voltage and generate an output voltage, which is different from the input voltage. The power source provides the input voltage to the voltage converter. A switch is further provided to switch the delivery of power to the control system between a power source voltage and an increased voltage derived from the voltage converter.
Abstract:
Es wird ein neuartiges Fahrzeugbordnetzsystem vorgeschlagen, das seine Spannungsversorgung aus einem Starter/Generator erhält, der im Normalbetrieb als Generator und im Startfall als Starter eingesetzt werden kann, wobei der Starter/Generator über Pulswechselrichter und einen 300 Volt DC-Zwischenkreis sowie einen bedirektionalen Wandler mit einem 24 Volt-Ringnetz sowie einer 24 Volt-Batterie verbunden ist. Aus dem bidirektionalen Gegentaktwandler bzw. dem 300 Volt DC-Zwischennetz werden weitere Verbraucher mit höheren Spannungen als 24 Volt sowie elektrische Steuergeräte, gegebenenfalls über weitere Wandler mit Spannung versorgt. Weiterhin soll dieses Bordnetzsystem eine Steckdose mit einer 220 Volt 50 Hz-Spannung enthalten. Abstract A novel vehicle circuit system is supplied with electrical energy by a starter/generator which functions normally as a generator and can be used as a starter for starting. The starter/generator is connected to a 24 volt ring main system and to a 24 volt battery by pulse rectifiers, a 300 volt d.c. intermediate circuit, and a bidirectional transformer. Other consumers, as well as electric control devices, are supplied with voltages greater than 24 volts by the bidirectional push-pull transformer or the 300 volt d.c. intermediate circuit, if necessary via other transformers. This vehicle circuit system also contains a socket with a 220 volt 50 Hz power supply.
Abstract:
Das Bord-Batterieladegerät dient zum Laden der Hauptbatterie eines Elektrospeicher-Straßenfahrzeuges aus einem Wechselspannungsnetz während des Stillsstandes des Fahrzeuges, wobei ein sinusförmiger Strom mit einem Leistungsfaktor von 1 aus dem Netz entnommen werden soll. Hierzu sind ein netzseitiges Hochfrequenzfilter (1), ein Netzgleichrichter (2), ein Hochsetzgleichstromsteller (3), ein kapazitiver Zwischenspeicher (4), ein Wechselrichter (5) ein Batteriegleichrichter (6) und ein batterieseitiger Hochfrequenzfilter (7) vorgesehen. Der Wechselrichter (5) enthält vorzugsweise zwei im Gegentakt mit hoher Frequenz betriebene Leistungstransistoren (T 2 , T 3 ). Zur Versorgung des Fahrzeug-Bordnetzes aus der Hauptbatterie während der Fahrt, wird die Hauptbatterie direkt an den kapazitiven Zwischenspeicher angeschlossen. Zur Spannungsanpassung kann zwischen Wechselrichter (5) und Batteriegleichrichter (6) ein Spartransformator vorgesehen sein.
Abstract in simplified Chinese:一种主动滤波器,其降低在PWM控制之马达驱动电路中的接地配线中之共模电流。该主动滤波器在部份上集成到一集成电路芯片中,且包含一缓冲放大器,其线性地驱动两个接合式或MOSFET晶体管以把共模电流从一接地配线和透过该等晶体管而引开。该等晶体管系连接在把d-c电力供应到驱动一个a-c马达的PWM发生器之正和负d-c总线间,在其接地框架中产生共模接地电流。一电流变压器监视共模电流,且其输出耦合至缓冲放大器之输入来控制该等晶体管。供放大器用的一内部电源供应器形成于两电流源和连接在d-c总线导体间之两齐纳二极管间的节点处。首间控制电路被揭露,以在所有输入a-c电压情况下对各个晶体管供应充分的首间电压。
Abstract:
It is an object of the invention to realize minimization of the total loss from magnification relationships among a fundamental wave loss generated by an AC motor, a loss of an inverter that drives the motor, and a loss generated by a harmonic of the inverter. Since the fundamental wave loss is increased along with the increase in load of the AC motor, a switching frequency of the inverter is lowered to reduce the fundamental wave loss, and the loss caused by fundamental wave current is lowered, so that the efficiency of a system is improved. In contrast, since the harmonic loss of the AC motor is dominant in a light load area, the efficiency is maximized by increasing the switching frequency of the inverter or the number of pulses and reducing a harmonic current.
Abstract:
An electronically commutated fan system (100) includes a conversion module (10), an inverter unit (20), and a control unit (30). The conversion module (10) receives an input power source (Vin) and converts the input power source (Vin) into a first DC power source (Vdcl). The inverter unit (20) receives the first DC power source (Vdcl) and converts the first DC power source (Vdcl) into an output power source (Vout) to make a fan (40) rotate. The control unit (30) controls a rotational speed of the fan (40) to be within a first error range (Rel) when the control unit (30) determines that an amplitude of the input power source (Vin) is varied. The control unit (30) determines that the input power source (Vin) is a DC power source or an AC power source. The conversion module (10) is controlled by the control unit (30) to convert the DC power source or the AC power source into the first DC power source (Vdcl).
Abstract:
A motor drive device provided with a booster circuit in a converter, wherein a converter control unit (15) is provided with a command setting unit (20) and a switching control unit (30). The command setting unit (20) has a first command determination unit (21) for determining a first DC voltage command Vi* corresponding to a power supply input current Ia, a second command determination unit (22) for determining a second DC voltage command Vω* corresponding to the speed ω at which a compressor motor rotates, and a selection unit (23) for selecting the first DC voltage command Vi* or the second DC voltage command Vω*, whichever is larger, and imparting the selected one as a DC voltage command Vdc* to the switching control unit (30).