摘要:
The device is for feeding electricity into a power grid (8) with a DC generator (1), a DC converter (2) and an inverter (3), and particularly to a DC converter (2) suited for the device. The DC converter (2) comprises a choking coil (15) having two windings (w1, w2) that are magnetically coupled and conductively connected to each other, two switches (86, 86) and three diodes (D6, D7, D8), and is configured such that grounding of the direct current generator (1) at the negative output (5) thereof is possible and the power load of the switches (85, 86) is kept small.
摘要:
In an inverter includes two input lines for connection to a DC voltage source, two half-bridges connecting the two input lines, and two output lines for connection to an alternating current load or an AC power grid. Each half-bridge includes two pulse-operated switches with reverse connected diodes, each output line is connected to a center point of one of the half-bridges via an inductance, and the two output lines are connected to the same one of the input lines via a further pulse-operated switch behind the inductance with respect to the associated half-bridge.
摘要:
The apparatus for feeding electrical energy into a power grid (8) with a DC voltage converter (2) intended for connection to a DC voltage generator (1) and with an inverter (3) connected thereto and intended for connection to a power grid (8), wherein the inverter contains a bipolar voltage intermediate circuit with two capacitors (C1, C2) that are placed in series and are connected together at a ground terminal (E3) intended for connection to a terminal of the DC voltage generator (1). The DC voltage converter (2) comprises at least two diodes (D3, D4), one switch and one storage choke (16) which is charged by the DC voltage generator (1) when the switch is closed and is discharged via the capacitors (C1, C2) and the diodes (D3, D4) when the switch is open. On the one side, the storage choke (16) forms, together with two switches (S3, S4), a first electric circuit intended for charging said storage choke (16), the electric circuit being adapted for connection to the DC voltage generator (1) by closing the switches (S3, S4) and that, on the other side, it lies, together with the two diodes (D3, D4) and the two capacitors (C1, C2), in a second electric circuit intended for simultaneously discharging of the storage choke (16) via both capacitors (C1, C2) and diodes (D3, D4), the second electric circuit being made operative by opening the switches (S3, S4).
摘要:
The apparatus for feeding electrical energy into a power grid (8) with a DC voltage converter (2) intended for connection to a DC voltage generator (1) and with an inverter (3) connected thereto and intended for connection to a power grid (8), wherein the inverter contains a bipolar voltage intermediate circuit with two capacitors (C1, C2) that are placed in series and are connected together at a ground terminal (E3) intended for connection to a terminal of the DC voltage generator (1). The DC voltage converter (2) comprises at least two diodes (D3, D4), one switch and one storage choke (16) which is charged by the DC voltage generator (1) when the switch is closed and is discharged via the capacitors (C1, C2) and the diodes (D3, D4) when the switch is open. On the one side, the storage choke (16) forms, together with two switches (S3, S4), a first electric circuit intended for charging said storage choke (16), the electric circuit being adapted for connection to the DC voltage generator (1) by closing the switches (S3, S4) and that, on the other side, it lies, together with the two diodes (D3, D4) and the two capacitors (C1, C2), in a second electric circuit intended for simultaneously discharging of the storage choke (16) via both capacitors (C1, C2) and diodes (D3, D4), the second electric circuit being made operative by opening the switches (S3, S4).
摘要:
An inverter (1) for a grounded direct voltage source, in particular for a photovoltaic generator (2), a battery or a fuel cell, for converting the direct voltage into an alternative voltage with a DC-DC converter (3) and a pulse inverter that is supplied by said DC-DC converter (3), said DC-DC converter (3) being configured to be an oscillating circuit inverter and comprising a series resonant oscillating circuit, said DC-DC converter (3), which is configured to be an oscillating circuit inverter, being configured to be a series-compensated oscillating circuit inverter with a choke (L1) and a series-mounted capacitor array consisting of two or several oscillating circuit capacitors, a rectifier bridge branch including 2 diodes (D3, D4; D5, D6, . . . ), being connected to each of the partial oscillating circuit capacitors, said rectifier bridge branch being connected with its positive or its negative pole to output side intermediate circuit capacitors which are preferably connected in series so that said DC-DC converter (3) delivers at least two bipolar output voltages and is combined with the pulse inverter (4) with a divided voltage intermediate circuit that is supplied from the oscillating circuit inverter.
摘要:
A buck converter for converting a DC voltage at input terminals into an output voltage at output terminals is disclosed. The buck converter includes a DC voltage link including a series-connection of at least two capacitors between the output terminals, and one subcircuit per each capacitor of the series-connection. Each subcircuit includes an inductor and a freewheeling diode. A first one of the input terminals is connected to a first output terminal by a series-connection of a semiconductor switch and the inductor of a first one of the subcircuits, and the subcircuits are coupled for balancing the voltages across their inductors. The buck converter may be used upstream of an inverter bridge of an inverter, such that a maximum voltage at the input terminals may exceed a maximum voltage rating of the bridge switches within the inverter.
摘要:
The device is for feeding electricity into a power grid (8) with a DC generator (1), a DC converter (2) and an inverter (3), and particularly to a DC converter (2) suited for the device. The DC converter (2) comprises a choking coil (15) having two windings (w1, w2) that are magnetically coupled and conductively connected to each other, two switches (S5, S6) and three diodes (D6, D7, D8), and is configured such that grounding of the direct current generator (1) at the negative output (5) thereof is possible and the power load of the switches (S5, S6) is kept small.
摘要:
A transformerless inverter that serves to feed electricity from a DC current source into an AC power grid, has an inverter bridge and a DC/DC converter connected upstream of the inverter bridge. The DC/DC converter converts an input DC voltage that is present between two input lines of the inverter into a DC link voltage present between two input lines of the inverter bridge. The inverter bridge converts the DC link voltage present at the input lines thereof into an output AC voltage. The DC/DC converter includes at least one resonant circuit that has a resonance inductance and a resonance capacitance and is connected on its input side via at least two clocked switches to one of the two input lines of the inverter or an intermediate potential line carrying a potential in between. The input lines of the inverter and the input lines of the inverter bridge are galvanically isolated from one another by a capacitive method. The resonant circuit may be undivided and is connected alternately to the two input lines of the inverter bridge.
摘要翻译:用于从直流电源馈入交流电网的无变压器逆变器具有逆变桥和连接在逆变桥上游的DC / DC转换器。 DC / DC转换器将存在于逆变器桥的两个输入线之间的直流链路电压中的逆变器的两个输入线之间存在的输入直流电压进行转换。 逆变桥将其输入线上存在的直流母线电压转换为输出交流电压。 DC / DC转换器包括至少一个谐振电路,其具有谐振电感和谐振电容,并且通过至少两个时钟控制的开关连接到其输入侧到逆变器的两个输入线之一或承载一个 之间的潜力。 逆变器的输入线和逆变桥的输入线通过电容法彼此电隔离。 谐振电路可以不分开,并且交替地连接到逆变器桥的两条输入线。
摘要:
An inverter (3) is described for feeding electrical energy into a power supply system (2) having in each case one input (6, 7) which is intended for connection to the negative and positive output (4, 5) respectively of a DC voltage generator (1) two outputs (8, 9) which are intended for connection to the power supply system (2), and a device, which has a strong inductor (L1) and switches (S1 to S6), for conversion of a DC voltage to an AC voltage. The input (7) which can be connected to the negative output (5) of the DC voltage generator (1) can be grounded, and at least one of the two outputs (8, 9) is provided with a mains inductor (L2). According the invention, the device contains a bridge circuit with two current paths (S4, L1, S6; S5, L1, S3) of which the one provides positive and the other negative output currents, a switching unit for switching, which is carried out at the power supply frequency, between the two current paths (S4, L1, S6; S5, L1, S3) and a coupling capacitor (1) which connects the bridge circuit to the switching unit.
摘要:
A direct current-direct current (DC/DC) converter operated in the resonant mode of operation for converting a direct input voltage into a direct output voltage with a bridge circuit located on the input side and incorporating switching elements, with a resonance circuit incorporating a resonance inductance and a resonance capacitance as well as with a high-frequency transformer for galvanic separation is disclosed, the transformer incorporates at least one primary winding and at least one secondary winding with at least two winding terminals each. The alternating current (AC) output of the bridge circuit is connected to the primary winding and a rectifier bridge with diodes to the secondary winding. A voltage boosting circuit array is connected downstream of the resonant circuit in such a manner that at least one additionally controllable switching element is contained, which is connected in parallel or in series to at least one additional diode or to at least one diode of the rectifier bridge on the secondary side, this array being connected in parallel to the high-frequency transformer so that the additional switching element short-circuits the resonance circuit in a triggered condition so that energy is stored in the resonance inductance and is delivered in the non-triggered condition.