Apparatus for increasing input voltage of electric vehicle, electric vehicle and apparatus operation method

Abstract

A device (102) for increasing the input voltage (105) of an electric vehicle (100) has an energy supply interface (110) connected to a vehicle battery (114), a DC-DC converter (111), and an inverter (112). The DC-DC converter (111) has a first connection (116) for connection to the energy supply interface (110) and a second connection (118) for connection to the inverter (112), wherein the DC-DC converter (111) is designed to supply an output voltage (122) at the second connection (118) in response to an amplifier signal (120), the output voltage being increased relative to the input voltage (105) applied to the first connection (116). The inverter (112) has an inverter connection portion (124) for connecting the inverter (112) to a second connection portion (118), and has at least one excitation interface (126) for exciting at least one unit coupled to the excitation interface (126), wherein the inverter (112) is designed to convert a DC voltage applied to the inverter connection portion (124) into an AC voltage and provide the AC voltage to the excitation interface (124).

Description

Technical Field

[0001] This invention relates to a device for increasing the input voltage of an electric vehicle, the electric vehicle, and a method for operating the device. Background Technology

[0002] In this industry, electric driving is becoming increasingly important as part of environmental protection, and its purpose is not only for electric passenger cars, but also for electric commercial vehicles. Summary of the Invention

[0003] Against this backdrop, according to the main claims, the present invention provides an improved device for increasing the input voltage of an electric vehicle, and further provides an improved electric vehicle and an improved method of operating the device. Advantageous improvements are embodied in the dependent claims and the following description.

[0004] The advantage that can be achieved by using the present invention is that it can increase the DC voltage supplied by the vehicle battery, thereby reliably supplying the electrical energy required for operating units inside or outside the vehicle.

[0005] A device for increasing the input voltage of an electric vehicle includes an energy supply interface, a DC-DC converter, and an inverter. The energy supply interface is configured to connect the device to a vehicle battery or a vehicle fuel cell of the electric vehicle. The DC-DC converter has a first connection for connecting the DC-DC converter to the energy supply interface and a second connection for connecting the DC-DC converter to the inverter. The DC-DC converter is designed to supply an output voltage at the second connection in response to an amplifier signal, the output voltage being increased relative to the input voltage applied to the first connection. The inverter has an inverter connection for connecting the inverter to the second connection and an excitation interface for exciting at least one unit coupled to the excitation interface. The inverter is designed to convert the DC voltage applied to the inverter connection to an AC voltage and supply the AC voltage to the excitation interface.

[0006] Electric vehicles can be implemented as electric commercial vehicles, such as trucks. The excitation interface can be designed to electrically connect one or more units inside or outside the vehicle. The inverter can be designed to convert the DC voltage applied to the inverter connection to an AC voltage and provide that AC voltage to the excitation interface in response to an inverter signal. Alternatively, the inverter can also be designed to convert the applied DC voltage to an AC voltage and automatically provide that AC voltage to the excitation interface when the DC voltage is applied to the inverter connection. Using the device presented herein, it is possible to ensure that the voltage provided by the vehicle battery and / or vehicle fuel cell can be increased as needed before supplying power to the unit battery. This is helpful because the voltage and energy that can be provided by the vehicle battery or vehicle fuel cell may decrease with increasing service life.

[0007] A DC-DC converter can be designed to provide an output voltage at a second connection point, where the output voltage corresponds to the input voltage when no amplifier signal is present. It can provide an unchanged or increased output voltage as needed. For example, an amplifier signal is generated only when an increased output voltage relative to the input voltage is required.

[0008] The inverter can be designed to provide an AC voltage of substantially 400 to 600 volts or 230 volts, and / or a frequency range of substantially 50 Hz to 60 Hz, at the excitation interface. Therefore, the excitation interface can be designed to connect one or more units inside or outside the vehicle. For example, the excitation interface can be coupled to, or may be coupled to, a unit connection for that unit, which is operable within a 15% tolerance of 230 volts and, for example, within a 10% tolerance of a frequency range of 50 Hz to 60 Hz, or within a 15% tolerance of 400 to 600 volts AC and, for example, within a 10% tolerance of a frequency range of 50 Hz to 60 Hz. The unit connection can be formed as a plug. However, there can be more, for example, three such unit connections that can be coupled to or may be coupled to three units for three units, wherein at least one can operate within a 15% tolerance range of 230 volts AC, and for example within a 10% tolerance range of a frequency range of 50 Hz to 60 Hz, and / or at least one can operate within a 15% tolerance range of 400 volts to 600 volts AC, and for example within a 10% tolerance range of a frequency range of 50 Hz to 60 Hz. For example, another electric vehicle, such as another vehicle battery for charging another vehicle battery via a vehicle battery and / or a vehicle fuel cell, can be connected to the excitation interface.

[0009] According to one embodiment, the DC-DC converter can also have a third connection for connecting the DC-DC converter to another inverter. The DC-DC converter is designed to further provide an output voltage at the third connection in response to an amplifier signal, the output voltage being increased relative to the input voltage applied to the first connection. Alternatively, the DC-DC converter can be designed to provide an output voltage at the third connection in response to another amplifier signal, the output voltage being increased relative to the input voltage applied to the first connection. For example, another inverter can be used to provide operating power to an auxiliary drive for an electric vehicle using the output voltage. The auxiliary drive can be designed to provide, for example, a function that extends beyond the gradual movement of the electric vehicle. For example, the auxiliary drive can be used to drive an excavator shovel or crane of the electric vehicle. Therefore, the increased output voltage can be advantageously used to ensure the proper operation of the auxiliary drive.

[0010] It is also advantageous for the device according to one embodiment to have another inverter, which has a fourth connection for connecting the other inverter to the third connection and a fifth connection for connecting the other inverter to an additional driver. The other inverter is designed to convert the DC voltage applied to the fourth connection to an AC voltage and provide the AC voltage at the fifth connection. Therefore, an AC voltage can be provided to the additional driver. The other inverter can be designed to convert the DC voltage applied to the fourth connection to an AC voltage and provide the AC voltage to the fifth connection in response to a signal from the other inverter. Alternatively, the other inverter can also be designed to convert the applied DC voltage to an AC voltage and automatically provide the AC voltage at the fifth connection when the DC voltage is applied to the fourth connection.

[0011] Another inverter can be designed to provide an AC voltage of substantially 400 to 600 volts and / or a frequency range of substantially 50 to 60 Hz at the fifth connection. Therefore, the AC voltage provided by the other inverter is also within a 15% tolerance range for the 400 to 600 volt range and / or within a 10% tolerance range for the 50 to 60 Hz frequency range. Such a voltage is suitable for the operation of an additional drive.

[0012] The device may further include an additional driver, which has an additional driver connector for connecting to the fifth connector.

[0013] Furthermore, it is advantageous for the device according to one embodiment to have a control device designed to output an amplifier signal to provide an output voltage at the second connection, the output voltage being increased relative to the input voltage applied to the first connection. The control device can also be designed to further output another amplifier signal to provide an output voltage at the third connection, the output voltage being increased relative to the input voltage applied to the first connection. Therefore, the increase in the input voltage can be controlled as needed.

[0014] The control device can be designed to output an amplifier signal when the input voltage is at or below a defined minimum voltage limit. For example, the minimum voltage limit could be 500 volts. Therefore, it is possible to ensure that a lower voltage value is amplified.

[0015] The control device can also be designed to not output an amplifier signal when the input voltage exceeds a predetermined minimum voltage limit. For example, the minimum voltage limit could be 500 volts. Therefore, it can be ensured that higher voltage values ​​are not increased.

[0016] According to one embodiment, the DC-DC converter can be designed to provide an output voltage of at least 576 volts at a second connection in response to an amplifier signal. Correspondingly, the DC-DC converter can be designed to provide an output voltage of at least 576 volts at a third connection in response to an amplifier signal or another amplifier signal. Therefore, it is possible to provide the voltage required to operate an auxiliary drive, maintain the power grid, or charge a battery or fuel cell of another vehicle.

[0017] The device can also include a vehicle battery and / or a vehicle fuel cell, which are designed to provide a DC voltage between 500 and 650 volts. Therefore, a common vehicle battery can be used, and due to the use of this device, an output voltage with a predetermined value can be used both at a low supply voltage of only 500 volts (e.g., due to aging) and at a high supply voltage of 650 volts.

[0018] Electric vehicles include devices configured as one of the aforementioned variations. Electric vehicles can be implemented as electric commercial vehicles, such as trucks. Electric vehicles can also include an additional drive unit electrically connected to the fifth connection.

[0019] The operating method of the device, which is one of the above-described variations, includes an addition step and a conversion step. In the addition step, the input voltage applied to the first connection is increased in response to an amplifier signal, and an increased output voltage relative to the input voltage is provided at the second connection. In the conversion step, the DC voltage applied to the inverter connection is converted to an AC voltage, and the AC voltage is provided at the excitation interface.

[0020] This method can be implemented, for example, in software, hardware, or a combination of both, such as in a controller. Attached Figure Description

[0021] Exemplary embodiments of the invention are illustrated herein in the accompanying drawings, and will be described in more detail below. In the drawings:

[0022] Figure 1 A schematic diagram of an electric vehicle having a device for increasing input voltage according to an exemplary embodiment is shown;

[0023] Figure 2 A schematic diagram of a device according to an exemplary embodiment is shown; and

[0024] Figure 3 A flowchart illustrating a device operation method according to an exemplary embodiment is provided. Detailed Implementation

[0025] In the following description of preferred exemplary embodiments of the present invention, the same or similar reference numerals are used to denote elements with similar functions shown in the figures, and repeated descriptions of these elements are omitted.

[0026] Figure 1 A schematic diagram of an electric vehicle 100 having a device 102 for increasing input voltage 105 according to an exemplary embodiment is shown.

[0027] According to this exemplary embodiment, device 102 is arranged, by way of example, within or on an electric vehicle 100. The electric vehicle 100 is, for example, an electric truck, having a grinder or, for example, a concrete pump. Device 102 has an energy supply interface 110, a DC-DC converter 111, and an inverter 112. The energy supply interface 110 is configured to connect device 102 to the vehicle battery 114 and / or the vehicle fuel cell of the electric vehicle 100. The DC-DC converter 111 has a first connection 116 for connecting the DC-DC converter 111 to the energy supply interface 110; and a second connection 118 for connecting the DC-DC converter 111 to the inverter 112. The DC-DC converter 111 is designed to supply an output voltage 122 at the second connection 118 in response to an amplifier signal 120, the output voltage being increased relative to the input voltage 105 applied to the first connection 116. Inverter 112 has an inverter connection portion 124 for connecting inverter 112 to a second connection portion 118, and has at least one excitation interface 126 for exciting at least one unit coupled to excitation interface 126, wherein inverter 112 is designed to convert DC voltage applied to inverter connection portion 124 into AC voltage and provide the AC voltage to excitation interface 126.

[0028] The excitation interface 126 is designed to electrically connect one or more units inside or outside the vehicle. According to this exemplary embodiment, the inverter 112 is designed to convert the DC voltage applied to the inverter connection 124 into an AC voltage and, in response to the inverter signal 128, provide the AC voltage to the excitation interface 126. According to an alternative exemplary embodiment, the inverter 112 is designed to convert the applied DC voltage into an AC voltage and automatically provide the AC voltage to the excitation interface 126 when the DC voltage is applied to the inverter connection 124. According to this exemplary embodiment, the DC-DC converter 111 is further designed to provide an output voltage at the second connection 118, the output voltage corresponding to the input voltage 105 when the amplifier signal 120 is not present.

[0029] According to this exemplary embodiment, the inverter 112 is designed to provide an AC voltage of 400 to 600 volts or 230 volts at the excitation interface 126. According to one exemplary embodiment, an AC voltage in the frequency range of 50 Hz to 60 Hz is provided.

[0030] According to one exemplary embodiment, the DC-DC converter 111 may optionally have a third connection 130 for connecting the DC-DC converter 111 to another inverter 132, wherein the DC-DC converter 111 is configured to further provide an output voltage 122 at the third connection 130 in response to an amplifier signal 120, the output voltage being increased relative to the input voltage 105 applied to the first connection 116. According to an alternative exemplary embodiment, the DC-DC converter 111 is configured to provide an output voltage 122 at the third connection 130 in response to another amplifier signal, the output voltage being increased relative to the input voltage 105 applied to the first connection 116. According to one exemplary embodiment, the other inverter 132 is used to provide operating energy 134 to an additional drive 136 of the electric vehicle 100 using the output voltage 122. According to this exemplary embodiment, the additional drive 136 is designed, for example, to provide a function that extends beyond the progressive movement of the electric vehicle 100. For example, the additional drive 136 is used to drive an excavator shovel or crane of the electric vehicle 100.

[0031] According to one exemplary embodiment, device 102 further includes another inverter 132, which has a fourth connection 138 for connecting the other inverter 132 to a third connection 130, and a fifth connection 140 for connecting the other inverter 132 to an additional driver 136. The other inverter 132 is configured to convert a DC voltage applied to the fourth connection 138 into an AC voltage and provide the AC voltage at the fifth connection 140. According to this exemplary embodiment, the other inverter 132 is designed to convert a DC voltage applied to the fourth connection 138 into an AC voltage and, in response to a signal from the other inverter, provide the AC voltage to the fifth connection 140. According to an alternative exemplary embodiment, the other inverter 132 is designed to convert an applied DC voltage into an AC voltage and automatically provide the AC voltage to the fifth connection 140 when a DC voltage is applied to the fourth connection 138.

[0032] According to an exemplary embodiment, another inverter 132 may be designed to provide an AC voltage of substantially 400 volts to 600 volts and / or a frequency range of substantially 50 Hz to 60 Hz at the fifth connection 140.

[0033] According to an exemplary embodiment, the device 102 further includes an additional driver 136, which has an additional driver connection for connection to the fifth connection 140.

[0034] According to one exemplary embodiment, device 102 further includes a control device 145 configured to output an amplifier signal 120 to provide an output voltage 122 at a second connection 118, the output voltage being increased relative to an input voltage 105 applied to a first connection 116. According to an alternative exemplary embodiment, control device 145 is also configured to output another amplifier signal to provide an output voltage 122 at a third connection 130, the output voltage being increased relative to an input voltage 105 applied to a first connection 116. According to one exemplary embodiment, control device 145 is configured to output amplifier signal 120 when the input voltage 105 has or is below a predetermined minimum voltage limit. According to one exemplary embodiment, for example, the minimum voltage limit is 500 volts. According to one exemplary embodiment, control device 145 is also configured not to output amplifier signal 120 when the input voltage 105 exceeds the predetermined minimum voltage limit.

[0035] According to this exemplary embodiment, the DC-DC converter 111 is designed to supply an output voltage 122 at the second connection 118 in response to an amplifier signal 120, the output voltage being at least 576 volts. According to another exemplary embodiment, correspondingly, the DC-DC converter 111 is designed to provide an output voltage 122 at the third connection 130 in response to an amplifier signal or another amplifier signal, the output voltage being at least 576 volts.

[0036] According to an exemplary embodiment, device 102 also includes vehicle battery 114 and / or vehicle fuel cell, which are designed to provide a DC voltage between 500 and 650 volts.

[0037] Due to the presence of the DC-DC converter 111 (also referred to as a DC / DC converter), the device 102 proposed herein advantageously implements the boost function of the excitation interface 126 and / or the electrically operable auxiliary driver 136 having a microgrid (i.e., a local limited grid). The auxiliary driver 136 can also be referred to as "ePower to work application" or "ePTO".

[0038] In this configuration, DC-DC converter 111 is connected between vehicle battery 114 and / or vehicle fuel cell and inverter 112 and / or another inverter 132. DC-DC converter 111 advantageously increases the DC voltage supplied by vehicle battery 114 and / or vehicle fuel cell, meaning that DC line voltage stabilization is achieved at low voltages supplied by vehicle battery 114 and / or vehicle fuel cell. Furthermore, the presence of DC-DC converter 111 optimizes the operating point and / or improves the efficiency of the additional driver 132 (also referred to as "eMotor"). Additionally, the presence of DC-DC converter 111 ensures a minimum voltage for the grid, referred to as a "microgrid." According to one exemplary embodiment, the minimum voltage at the second connection 118 and / or the third connection 130 is 576 volts DC, which is used to provide, for example, an AC voltage of 400VAC / 50Hz at the excitation interface 126 and / or the additional driver connection. According to one exemplary embodiment, device 102 includes at least one electrically insulating portion.

[0039] When constructing a 400VAC / 50Hz microgrid, for example when the vehicle battery 114 and / or the vehicle fuel cell provides a minimum voltage of approximately 500V DC at a rated voltage of 650V DC, this is insufficient for the construction of a 400VAC / 50Hz microgrid. The boost function achievable via the DC-DC converter 111 ensures sufficient voltage levels and proper functionality. A minimum DC voltage of 576V is necessary for constructing such a microgrid. Therefore, when the voltage drops below this minimum DC voltage of 576V, according to an exemplary embodiment, the DC-DC converter 111 increases the voltage to 576V or higher DC, thereby ensuring the proper functioning of the 400VAC / 50Hz microgrid without voltage drop.

[0040] Figure 2 A schematic diagram of a device 102 according to an exemplary embodiment is shown. The device may be... Figure 1 The device 102 described herein.

[0041] According to this exemplary embodiment, the vehicle fuel cell 200 is externally electrically connected to the energy supply interface 110 of the vehicle battery 114. According to this exemplary embodiment, a booster device 205 is contact-connected between the vehicle fuel cell 200 and the energy supply interface 110, and the booster device is designed to increase the energy supplied by the vehicle fuel cell 200. According to one exemplary embodiment, the vehicle fuel cell 200 and / or the booster device 205 are part of the device 102.

[0042] The DC-DC converter 111 is designed to increase or decrease the DC voltage according to the switching frequency of one or more DC-DC converter switches 207, 208. The conversion is performed by periodically operating one or more DC-DC converter switches 207, 208 and one or more energy storage devices (in this case, capacitors). The inductor 209, acting as an inductive converter and used for intermediate energy storage, is composed of, for example, a coil or a commutator transformer. Therefore, a known converter with an adjustable amplification factor can be used as the DC-DC converter 111.

[0043] According to this exemplary embodiment, inverter 112 and / or another inverter 132 have at least one bridge circuit consisting of switches (typically transistors). Known inverters, such as inverters 112 and 132, can be used.

[0044] According to this exemplary embodiment, three unit connectors 210, 215 for each vehicle interior or vehicle exterior unit are electrically coupled to excitation interface 126. According to one exemplary embodiment, the first unit connector 210 is formed as a first plug and is designed to power the first unit within a 15% deviation range of 400V to 600V AC, for example, within a 10% deviation range of the 50Hz to 60Hz frequency range. According to one exemplary embodiment, the second unit connector 215 is formed as a second plug and is designed to power the second unit within a 15% deviation range of 230V AC, for example, within a 10% deviation range of the 50Hz to 60Hz frequency range. According to one exemplary embodiment, another second unit connector 215 is formed as another second plug and is designed to power the second unit within a 15% deviation range of 230V AC, for example, within a 10% deviation range of the 50Hz to 60Hz frequency range. According to one exemplary embodiment, the first unit connection portion 210, the second unit connection portion 215, and / or another second unit connection portion 215 are all part of the device 102. According to an alternative exemplary embodiment, the device 102 has a larger [specification] at the excitation interface 126 than [specification]. Figure 2 The unit connection portions 210, 215 shown may include fewer or any number of additional first unit connection portions 210 and / or additional second unit connection portions 215, which are formed, for example, in the form of plugs. Figure 2 As shown.

[0045] According to an exemplary embodiment, a microgrid (400VAC / 50Hz) refers to a power grid with an AC voltage of 3x0 to 230V ±15% or 3x0 to 400V ±15%, and for example, in a frequency range of 50Hz ±10% or 60Hz ±10%.

[0046] Figure 3 A flowchart illustrating a device operation method 300 according to an exemplary embodiment is provided. The device may be the proposed... Figure 1 or Figure 2 A variation of the device shown.

[0047] Method 300 includes an amplification step 305 and a conversion step 310. In the amplification step 305, the input voltage applied to the first connection is increased in response to an amplifier signal, and an increased output voltage relative to the input voltage is provided at the second connection. In the conversion step 310, the DC voltage applied to the inverter connection is converted to an AC voltage, and this AC voltage is provided at the excitation interface.

[0048] Figure Labels

[0049] 100 electric vehicles

[0050] 102 Equipment

[0051] 105 Input Voltage

[0052] 110 Energy Supply Interface

[0053] 111 DC-DC Converter

[0054] 112 Inverter

[0055] 114 Vehicle Battery

[0056] 116 First Connection

[0057] 118 Second Connection

[0058] 120 Amplifier Signal

[0059] 122 Output Voltage

[0060] 124 Inverter Connections

[0061] 126. Excitation Interface

[0062] 128 Inverter Signal

[0063] 130 Third Connection

[0064] 132 Another inverter

[0065] 134 Operating Energy

[0066] 136 Additional Driver

[0067] 138 Fourth Connection

[0068] 140 Fifth Connection

[0069] 145 Control device

[0070] 200 vehicle fuel cells

[0071] 205 Boosting Unit

[0072] 210 First Unit Connection

[0073] 215 Second Unit Connection

[0074] 300 Equipment Operation Method

[0075] 305 Add steps

[0076] 310 Conversion Steps

Claims

1. A device (102) for increasing the input voltage (105) of an electric vehicle (100), said device (102) having the following features: An energy supply interface (110) is provided for connecting the device (102) to the vehicle battery (114) of the electric vehicle (100) and / or the vehicle fuel cell (200) of the electric vehicle (100). A DC-DC converter (111) having a first connection (116) for connecting the DC-DC converter (111) to the power supply interface (110) and a second connection (118) for connecting the DC-DC converter (111) to an inverter (112), the DC-DC converter (111) being designed to provide an output voltage (122) at the second connection (118) in response to an amplifier signal (120), the output voltage being increased relative to an input voltage (105) applied to the first connection (116); and The inverter (112) has an inverter connection portion (124) for connecting the inverter (112) to the second connection portion (118), and has at least one excitation interface (126) for exciting at least one unit coupled to the at least one excitation interface (126). The inverter (112) is designed to convert a DC voltage applied to the inverter connection portion (124) into an AC voltage and provide the AC voltage to the at least one excitation interface (126). in, The DC-DC converter (111) is designed to provide an output voltage (122) at the second connection (118), which corresponds to the input voltage (105) when the amplifier signal (120) is not present. The DC-DC converter (111) has a third connection (130) for connecting the DC-DC converter (111) to another inverter (132), wherein the DC-DC converter (111) is designed to further respond to the amplifier signal (120) by providing the output voltage (122) at the third connection (130), the output voltage being increased relative to the input voltage (105) applied to the first connection (116).

2. The device (102) according to claim 1, wherein, The inverter (112) is designed to provide an AC voltage of 400 to 600 volts or 230 volts and / or a frequency range of 50 Hz to 60 Hz at at least one excitation interface (126).

3. The device (102) according to claim 1, comprising the other inverter (132) having a fourth connection (138) for connecting the other inverter (132) to the third connection (130) and a fifth connection (140) for connecting the other inverter (132) to an additional driver (136), the other inverter (132) being designed to convert a DC voltage applied to the fourth connection (138) into the AC voltage and provide the AC voltage at the fifth connection (140).

4. The device (102) according to claim 3, wherein, The other inverter (132) is designed to provide the AC voltage of 400 to 600 volts and / or a frequency range of 50 Hz to 60 Hz at the fifth connection (140).

5. The device (102) according to claim 4, including the additional driver (136), the additional driver (136) having an additional driver connection for connection to the fifth connection (140).

6. The device (102) according to claim 1, comprising a control device (145) configured to output the amplifier signal (120) to provide the output voltage (122) at the second connection (118), the output voltage being increased relative to the input voltage (105) applied to the first connection (116).

7. The device (102) according to claim 6, wherein, The control device (145) is designed to output the amplifier signal (120) when the input voltage (105) has or is below a specified minimum voltage limit.

8. The device (102) according to claim 6, wherein, The control device (145) is designed to not output the amplifier signal (120) when the input voltage (105) exceeds a specified minimum voltage limit.

9. The device (102) according to claim 1, wherein, The DC-DC converter (111) is designed to provide the output voltage (122) at the second connection (118) in response to the amplifier signal (120), the output voltage being at least 576 volts.

10. The device (102) according to claim 1. Includes the vehicle battery (114) and / or the vehicle fuel cell (200), the vehicle battery (114) and / or the vehicle fuel cell (200) being designed to provide the DC voltage between 500 and 650 volts.

11. An electric vehicle (100) comprising the device (102) according to any one of the preceding claims.

12. A method (300) of operating the device (102) according to any one of claims 1-10, wherein, The method (300) includes the following steps: In response to the amplifier signal (120), the input voltage (105) applied to the first connection (116) is increased (305), and an increased output voltage (122) relative to the input voltage (105) is provided at the second connection (118); and The DC voltage applied to the inverter connection (124) is converted (310) into AC voltage and the AC voltage is provided at the excitation interface (126).

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