Energy supply for an x-ray system comprising an x-ray tube

Abstract

An energy supply device (2) of an X-ray tube (1) has an input stage (3), an output stage (4) and an intermediate circuit (5). The intermediate circuit (5) has two lines (6, 7) which are connected to the input stage (3) and to the output stage (4), respectively. The two lines (6, 7) of the intermediate circuit (5) have different potentials from one another, the difference of which forms an intermediate circuit voltage (U). The input stage (3) is connected to an AC network (9) such that the input stage (3) can take electrical energy from the AC network (9) and deliver the electrical energy taken to the intermediate circuit (5). The output stage (4) is connected to the X-ray tube (1) such that the output stage (4) can extract electrical energy from the intermediate circuit (5) and convert the electrical energy extracted into a high voltage and deliver the high voltage to the X-ray tube (1). The energy supply device (2) has an electrical energy storage system (10) which has an electrical energy storage capacitor bank (11) and an energy storage-side converter circuit (12) which is exclusively assigned to the electrical energy storage capacitor bank (11). The electrical energy storage capacitor bank (11) is connected to the intermediate circuit (5) via the energy storage-side converter circuit (12).

Description

Technical Field

[0001] This invention is based on an energy supply device for an X-ray system including an X-ray tube.

[0002] - The energy supply device described herein has an input stage, an output stage, and an intermediate circuit.

[0003] - The intermediate loop has two lines, which are connected to the input stage and the output stage respectively.

[0004] - The two lines in the intermediate loop have different potentials, and the difference in potentials forms the intermediate loop voltage.

[0005] - The input stage is connected to the AC power grid, allowing it to draw power from the grid and transmit it to the intermediate circuit.

[0006] The output stage is connected to the X-ray tube, allowing it to extract electrical energy from the intermediate circuit, convert the extracted energy into high voltage, and supply it to the X-ray tube.

[0007] - The energy supply device has an electric energy storage system, which has an electric energy storage capacitor bank. Background Technology

[0008] The above content is generally known. See US 2022 / 0086 997 A1 and US 2023 / 0137 033 A1 for examples only.

[0009] Such an energy supply device is also known from DE 10 2021 003 254 A1. In this energy supply device, an intermediate circuit capacitor is directly connected to the intermediate circuit. The voltage drop across the intermediate circuit capacitor corresponds to the intermediate circuit voltage at any given time. The battery is connected to the intermediate circuit via a converter circuit. A high-voltage converter is connected to the intermediate circuit via another converter circuit. An energy storage capacitor is disposed between the other converter circuit and the high-voltage converter.

[0010] X-ray facilities are used for various purposes, particularly for interventional medical procedures. In these procedures, X-ray images are repeatedly examined at short time intervals and output via a screen or similar device. These time intervals are typically between approximately 33 ms and 140 ms, corresponding to an image sequence of 7 to 30 images per second. The examination of a single image takes only a few milliseconds, for example, between 3 ms and 10 ms.

[0011] This type of operation of an X-ray facility has different consequences. One consequence is that, for short periods (i.e., during the corresponding image detection period, such as 5 ms), the operation of the X-ray tube and thus the entire X-ray equipment requires very high energy. In this mode of operation, the maximum energy requirement of the X-ray tube is typically in the double-digit kW range, for example, between 25 kW and 40 kW. For detections in computed tomography (CT) equipment, the maximum energy requirement can even be in the low triple-digit kW range. During the rest of the time, the energy requirement of the X-ray equipment is significantly lower, and the energy requirement of the X-ray tube itself—may be zero, except for anode drive and emitter heating. Therefore, the time-varying curve of the X-ray equipment's electrical power consumption fluctuates significantly.

[0012] The entire energy supply chain, from the AC grid to the X-ray tube, can be designed to capture maximum power. However, this is disadvantageous because not only the connections to the AC grid but also the protective technology devices (cable cross-sections, fuses, etc.) must be designed for such high maximum power capture (in the triple kW range). Furthermore, the AC grid itself must have the necessary power reserves to provide the required peak power for short periods. This is often not the case, especially in developing countries.

[0013] To limit power extraction from the AC grid while still providing the required peak power to the X-ray tube, prior art energy supply devices incorporate an electrical energy storage system with an electrical energy storage capacitor. In the prior art, the electrical energy storage capacitor is implemented as a common intermediate-loop capacitor. Therefore, the electrical energy storage capacitor is directly connected to the two lines of the intermediate loop. The voltage dropped across the intermediate-loop capacitor is the intermediate-loop voltage. The electrical energy stored in the intermediate-loop capacitor can be used for short-term buffering. Therefore, the input stage can be configured such that it limits the power extracted from the AC grid by the input stage and also causes a uniform (possibly sinusoidal) power extraction.

[0014] However, the seemingly convincing solution has some drawbacks upon closer inspection.

[0015] For the electrical energy E stored in the intermediate-loop capacitor, the relationship E = CU² / 2 applies at every moment. C is the capacitance of the intermediate-loop capacitor, and U is the current intermediate-loop voltage. Therefore, the maximum value of the intermediate-loop voltage should be chosen as high as possible. However, the upper limit of the intermediate-loop voltage is derived from the electrical design of the input stage, and especially the output stage, particularly the blocking voltage of the semiconductor switches and other semiconductor components used. In practice, for power supplied from a single-phase AC grid, the upper limit is typically around 480V. However, there is usually a lower limit due to the design of the output stage. Typically, the lower limit is around 290V.

[0016] In many cases, the input stage is also configured such that it can only operate as a boost converter. In this case, the input stage also limits the downward voltage of the intermediate loop. This is particularly critical when operating a so-called wide-range mains input, which should be able to operate with single-phase mains voltages between 100V and 240V. In this case, the downward limit increases to approximately 340V.

[0017] Therefore, in practice, only a portion of the total electrical energy stored in the intermediate circuit capacitor can be used. If—for example—the voltage is limited upwards to 480V and downwards to 290V, only about 63.5% of the maximum stored internal energy can be used. At the 480V and 340V limits, this value drops to about 50%.

[0018] While a reduction to 50% can be avoided through appropriate input stage design, particularly by designing the input stage to function as a buck converter, this design is associated with increased costs and overhead. Furthermore, it introduces disadvantages to the uniformity of energy extraction from the AC grid, resulting in grid backlash.

[0019] Additionally, a battery is present in DE 10 2021 003 254 A1, which is connected to the intermediate circuit via a converter circuit. While the battery is typically capable of storing a relatively large amount of internal energy, it is generally not capable of providing a large current for short periods of time. Summary of the Invention

[0020] The object of the present invention is to create the following feasibility, by which the disadvantages of the prior art can be avoided or at least mitigated.

[0021] The objective is achieved by an energy supply device having the features of claim 1. Advantageous designs of the energy supply device are the subject of dependent claims 2 to 8.

[0022] According to the present invention, the energy supply device of the type described at the beginning is designed such that the electric energy storage system has a converter circuit on the energy storage side specifically configured for the energy storage capacitor bank, the energy storage capacitor bank being connected to the intermediate circuit via the energy storage side converter circuit.

[0023] The wording "dedicated configuration" should indicate that, although the energy storage capacitor bank is connected to the intermediate circuit via the converter circuit on the energy storage side, no other unit or device is connected to the intermediate circuit except for the energy storage capacitor bank.

[0024] Energy storage capacitor banks can only achieve relatively small amounts of electrical energy storage. Therefore, while they can store energy for detecting a single X-ray image or a small number of X-ray images, they cannot sustain long-term emergency operation. More precisely, power still needs to be supplied via the AC grid and the input stage. Nevertheless, significant advantages are still available.

[0025] On the one hand, compared to intermediate circuit capacitors, the limitation on the operating voltage of the capacitor can be significantly reduced, for example, to about 130V. If the capacitor can now—for example—operate between 470V and 130V, then more than 92% of the internal energy stored in the capacitor can be utilized. Due to the higher utilization rate, the capacitor can be selected to be smaller than the capacitors previously required for intermediate circuit capacitors. This also reduces size, weight, and cost.

[0026] On the other hand, the input stage does not need to be designed to operate as a buck converter. This is because the low operating voltage of 130V is for the energy storage device, not the intermediate circuit. Therefore, the intermediate circuit voltage can still be maintained, for example, at least 290V or at least 340V.

[0027] The converter circuit and output stage on the energy storage side are preferably designed so that they can operate directly at the intermediate loop voltage without the need for other converter stages, i.e., no other converter stages are required. This also preferably applies when the input stage is configured as a wide-range grid input.

[0028] Therefore, the advantages achievable through the converter circuit on the energy storage side far outweigh the disadvantages due to the increased loop technology costs and associated financial costs. Furthermore, at least a portion of the financial costs can be offset by the ability to design smaller energy storage capacitor banks and simpler input stage designs.

[0029] With the help of the converter circuit on the energy storage side, bidirectional power transfer must be feasible, i.e., from the intermediate loop to the energy storage device and vice versa. Furthermore, the converter circuit on the energy storage side can be configured according to requirements. Preferably, the converter circuit on the energy storage side is configured as a combined boost / buck converter, a pure boost converter, or a pure buck converter.

[0030] In all three cases, bidirectional power transfer is feasible. However, in the case of a combined boost / buck converter design, power transfer is feasible regardless of whether the intermediate loop voltage is greater than or less than the current operating voltage of the energy storage device. In a boost converter design, the intermediate loop voltage must be greater than the operating voltage of the energy storage device. The opposite is true in a buck converter design.

[0031] The output stage design can be conventional. Specifically, it can include an output-side converter, a high-voltage transformer, and an output-side rectifier. The output-side converter converts the intermediate circuit voltage to AC voltage on the output side, the high-voltage transformer transforms the AC voltage on the output side into high voltage, and the output-side rectifier rectifies the high voltage and supplies it to the X-ray tube. However, the intermediate circuit voltage can be stabilized by supplying energy from the energy storage capacitor bank to the intermediate circuit via a converter circuit on the energy storage side during the power phase of the X-ray tube. Therefore, in many cases, the output stage can be designed more simply and cost-effectively.

[0032] While it is still feasible to discharge the energy storage device during the detection of the corresponding X-ray image and recharge it during the interval until the next X-ray image is detected, the energy drawn from the AC grid can be largely homogenized by the energy storage capacitor bank. Therefore, the input stage can be configured such that it limits the power drawn from the AC grid. This power limitation must, of course, be configured so that the energy storage capacitor bank can be recharged separately during the intervals between X-ray image detections. However, this is easily achieved through a corresponding design scheme for the input stage.

[0033] A typical design for the input stage includes an input-side rectifier and an input-side converter circuit. The input-side rectifier rectifies the AC voltage supplied from the AC mains, and the input-side converter circuit delivers the rectified AC voltage to the intermediate loop. The input-side converter circuit can, in particular, be configured as a boost converter. Therefore, the design of the input stage commonly used in the prior art can be retained. Alternatively, a design with a so-called wide-range mains input (typically 100V to 240V) can also be retained.

[0034] The converter circuit on the energy storage side is equipped with a control device. Preferably, the intermediate loop voltage and the operating parameters of the energy storage device are supplied to the control device. In this case, it is feasible for the control device to determine the operation of the converter circuit on the energy storage side using only the intermediate loop voltage and operating parameters, and possibly the operating parameters of the converter circuit on the energy storage side, and to operate the converter circuit on the energy storage side according to the determined operation.

[0035] Therefore, real-time communication with the input stage is particularly unnecessary, as such communication would be necessary if the operation of the converter circuitry on the energy storage side were clearly coordinated. More precisely, the control unit primarily determines the operating mode based on the intermediate loop voltage, unless the energy storage capacitor bank is fully charged or over-discharged (e.g., the operating voltage reaches a lower limit when the energy storage capacitor bank is discharging). Operating parameters typically include the operating voltage of the energy storage capacitor bank and / or the current currently charging or discharging the energy storage capacitor bank.

[0036] This decentralized control of the converter circuitry on the energy storage side also offers several other advantages. Firstly, existing energy supply units can be retrofitted without requiring any intervention in other controls of the energy supply unit. Secondly, multiple energy storage systems can be configured, each with its own energy storage-side converter circuitry and its own energy storage capacitor device. This is because different energy storage systems can be controlled independently of each other, as each system only requires the intermediate loop voltage and the operating parameters of its own energy storage capacitor device to determine the appropriate operation.

[0037] Preferably, a filter is installed upstream of the control device to filter the intermediate loop voltage before it is supplied to the control device. This filters out fluctuations in the intermediate loop voltage that remain even after rectification of the AC voltage on the input side by the input stage. This leads to improved operation of the converter circuit on the energy storage side. Attached Figure Description

[0038] The features, characteristics, and advantages of the present invention described above, as well as the ways and methods of achieving said features, characteristics, and advantages, become clearer and easier to understand in conjunction with the following description of the embodiments, which are illustrated in detail with reference to the accompanying drawings. Schematic diagrams are shown here:

[0039] Figure 1 The power supply device and X-ray tube are shown.

[0040] Figures 2 to 4 This illustrates the design scheme of the converter circuit.

[0041] Figure 5 Show the output stage,

[0042] Figure 6 The electric energy storage system is shown.

[0043] Figure 7 Show the input level,

[0044] Figures 8 to 11 A timeline is shown.

[0045] Figure 12 The characteristic curves are shown, and

[0046] Figure 13 A feasible structural design for the control device is shown. Detailed Implementation

[0047] according to Figure 1The X-ray tube 1 is powered by an energy supply device 2. For this purpose, the energy supply device 2 has an input stage 3, an output stage 4, and an intermediate circuit 5. The intermediate circuit 5 has two lines 6 and 7, which are connected to the input stage 3 and the output stage 4, respectively. These two lines 6 and 7 have different potentials. The difference between these two potentials forms the intermediate circuit voltage U. An intermediate circuit capacitor 8 is also present in the prior art and, generally, within the scope of this invention.

[0048] Input stage 3 is connected to AC power grid 9. Therefore, input stage 3 can obtain electrical energy from AC power grid 9 and transmit the obtained electrical energy to intermediate circuit 5. AC power grid 9... Figure 1 The circuit is shown as a single-phase circuit. However, the AC power grid 9 can also be configured as a multi-phase circuit. The output stage 4 is connected to the X-ray tube 1. Thus, the output stage 4 can extract electrical energy from the intermediate circuit 5 and convert the extracted electrical energy into high voltage and supply it to the X-ray tube 1.

[0049] The energy supply device 2 also includes an energy storage system 10. The energy storage system 10 includes an energy storage unit 11 and a converter circuit 12 on the energy storage side. The energy storage unit 11 is connected to the intermediate circuit 5 via the converter circuit 12 on the energy storage side. The converter circuit 12 on the energy storage side is dedicated to the energy storage unit 11. Therefore, the converter circuit 12 controls the transmission of electrical energy from the intermediate circuit 5 to the energy storage unit 11 and vice versa, but does not control other transmissions of electrical energy. Thus, the converter circuit 12 is connected to the intermediate circuit 5 on one hand and to the energy storage unit 11 on the other, but not to other units or devices.

[0050] The purpose of referring to converter circuit 12 as an energy storage-side converter circuit is to distinguish it linguistically from other converter circuits that will be described later. The term "energy storage-side" does not have a deeper meaning.

[0051] The converter circuit 12 on the energy storage side can be configured as a combined boost / buck converter. Figure 2 ), pure boost converter ( Figure 3 or a pure buck converter ( Figure 4 The preferred design is a combination of boost / buck converters.

[0052] according to Figure 5The output stage includes an output-side converter 13, a high-voltage transformer 14, and an output-side rectifier 15. The output-side converter 13 converts the intermediate circuit voltage U into an output-side AC voltage. The high-voltage transformer 14 transforms the output-side AC voltage into a high voltage. The output-side rectifier 15 rectifies the high voltage and delivers the rectified high voltage to the X-ray tube 1. The purpose of designating converter 13 as an output-side converter and rectifier 15 as an output-side rectifier is to distinguish these two components 13 and 15 linguistically from other converters and rectifiers. The term "output-side" has no further specific meaning.

[0053] according to Figure 6 The energy storage device 11 is configured as an energy storage capacitor bank 11. In its simplest form, the energy storage capacitor bank 11 is a simple energy storage capacitor. Furthermore, the input stage 3 is preferably configured such that it limits the power drawn from the AC power grid 9 by the input stage 3. For example, the input stage 3 may correspond to... Figure 7 The diagram shows an input-side rectifier 16 and an input-side converter circuit 17. In this case, the input-side rectifier 16 rectifies the AC voltage supplied by the AC power grid 9. The input-side converter circuit 17 converts the rectified input-side AC voltage and delivers it to the intermediate circuit 5. Here, referring to the input-side rectifier 16 and the input-side converter circuit 17 as "input-side" is merely for linguistic distinction from other rectifiers and other converter circuits. The rectifier 16 can be configured as a B6 rectifier, particularly a diode rectifier. The input-side converter circuit 17 can be configured as a combined boost / buck converter. Preferably, the input-side converter circuit is configured as a boost converter. In the case of the input-side converter circuit 17, it is sufficient for the input-side converter circuit to transfer energy only unidirectionally (i.e., from the rectifier 16 to the intermediate circuit 5).

[0054] In many cases, additional devices are also connected to intermediate circuit 5. For example, another converter may be connected to intermediate circuit 5 to power the rotation drive of X-ray tube 1. Another converter device may also be connected to intermediate circuit 5 to supply voltage to the focusing device of X-ray tube 1. Energy may also be supplied to the heating device of X-ray tube 1, for example, via another converter or another converter device. Electrical energy may also be supplied to other devices. Such devices are not shown in the accompanying drawings.

[0055] Figure 8 The acquisition of electrical power P1 by X-ray tube 1 is shown as a function of time t. According to... Figure 8X-ray tube 1 does not continuously acquire electrical energy. More precisely, energy acquisition occurs only during the power phase of X-ray tube 1. Energy is acquired from intermediate circuit 5 by output stage 4 only during the power phase. There are power intervals between the power phases, during which X-ray tube 1 does not acquire energy, and therefore output stage 4 does not acquire energy either. For example, the power phase begins at time t1 and the power interval begins at time t2. The power phase has a duration T1, and the power interval has a duration T2. ​​Therefore, Figure 8 This illustrates a single period. In practice, periods typically follow each other periodically over longer time periods. Duration T1 is usually significantly shorter than duration T2. ​​The ratio of duration T1 to duration T2 is typically 0.2 or less.

[0056] Figure 9 This illustrates the corresponding transfer of electrical energy or power P2 from the energy storage capacitor bank 11 to the intermediate circuit 5. According to... Figure 9 During the corresponding power phase, electrical energy is transferred from the energy storage capacitor bank 11 to the intermediate loop 5 via the converter circuit 12 on the energy storage side. This results in at least one of the two effects described below.

[0057] On the one hand, according to Figure 10 The illustration shows that the acquisition of electrical energy or power P3 from AC grid 9 is homogenized. Therefore, the acquisition of electrical energy from AC grid 9 fluctuates only slightly around the time average of the desired electrical power P1. Ideally, this acquisition would be completely stable.

[0058] On the other hand, according to Figure 11 The illustration shows that it is feasible to stabilize the intermediate loop voltage U. This effect is particularly evident when the power P3 obtained from the AC grid 9 is limited by the corresponding design scheme of the input stage 3. Figure 11 The time variation curve of the intermediate circuit voltage U is shown as a solid line, as the time variation curve is generated due to the transfer of electrical energy from the energy storage capacitor bank 11 to the intermediate circuit 5. Figure 11 The (theoretical) time variation curve of the intermediate circuit voltage U is also shown in dashed lines, as would occur if the transfer of electrical energy from the energy storage capacitor bank 11 to the intermediate circuit 5 were not taking place.

[0059] according to Figure 11During the power phase, although electrical energy is transferred from the energy storage capacitor bank 11 to the intermediate circuit 5, the intermediate circuit voltage U still decreases. This is because the electrical energy extracted through the output stage 4 is greater than the electrical energy supplied through the input stage 3 and the energy storage capacitor bank 11. In this case, at the start of the corresponding power interruption, the intermediate circuit voltage U rises again as quickly as possible. This is achieved by extracting electrical energy from the AC grid 9 and / or by transferring electrical energy from the energy storage capacitor bank 11 to the intermediate circuit 5.

[0060] Figure 12 The possible characteristic curves of power transfer between intermediate loop 5 and energy storage capacitor bank 11 are shown as a function of intermediate loop voltage U. According to... Figure 12 Energy is transferred from the energy storage capacitor bank 11 to the intermediate circuit 5 as long as the intermediate circuit voltage U is below the limit value U0. Specifically, a lower limit voltage U1 and an upper limit voltage U2 can be defined. If the intermediate circuit voltage U is below the lower limit voltage U1, as much energy as possible—if necessary, limited to a relatively high value—is transferred from the energy storage capacitor bank 11 to the intermediate circuit 5 by means of the energy storage-side converter circuit 12. If the intermediate circuit voltage U is above the upper limit voltage U2, the energy transferred from the intermediate circuit 5 to the energy storage capacitor bank 11 is limited to a maximum value by means of the energy storage-side converter circuit 12. This maximum value is at most as large as the maximum power P3 delivered to the intermediate circuit 5 by the input stage 3. The energy storage capacitor bank 11 is recharged by the transfer of electrical energy from the intermediate circuit 5 to the energy storage capacitor bank 11.

[0061] A continuous curve, such as a linear curve, can be defined between the lower and upper voltage limits U1 and U2. The limiting value U0 is the voltage between the lower and upper voltage limits U1 and U2 at which the following voltage, Figure 12 The characteristic curve shown intersects the horizontal axis.

[0062] according to Figure 13 The converter circuit 12 on the energy storage side is controlled by a control device 18 associated with the converter circuit 12 on the energy storage side. In a particularly simple and preferred design, according to Figure 13 The intermediate loop voltage U and the operating parameters BG of the energy storage capacitor bank 11 are supplied to the control device 18. In this case, the control device 18 can determine the operation C of the energy storage side converter circuit 12 using only the intermediate loop voltage U and the operating parameters BG, and operate the energy storage side converter circuit 12 according to the determined operation C. The operating parameters BG may in particular include the operating voltage U' of the energy storage capacitor bank 11.

[0063] Figure 13 A feasible and currently preferred design of the control device 18 is shown. According to... Figure 13A filter 19 is provided upstream of the control device 18. By means of the filter 19, the intermediate loop voltage U is filtered before being supplied to the control device 18. This allows for the (at least substantially) filtering out of fluctuations in the intermediate loop voltage U that remain despite rectification of the AC voltage on the input side by the input stage 3. Subsequently, within the control device 18, in block 20, for example by applying... Figure 12 The characteristic curve is used to determine the expected value P2* (with a sign) of the power P2 to be transferred from the energy storage capacitor bank 11 to the intermediate circuit 5. In the following block 21, the expected value I* for the current is determined, taking into account the operating parameter BG. In the following block 22, the control C for the converter circuit 12 on the energy storage side is determined. For example, a regulator can be implemented through block 22. In this case, the control device 18 also additionally utilizes the operating parameter BG' of the converter circuit 12 on the energy storage side, especially the driven current. The regulator characteristics can, for example, correspond to a PI regulator. The determined control C is then output to the converter circuit 12 on the energy storage side.

[0064] This invention offers numerous advantages. Depending on the specific design, at least the maximum power extraction from the AC grid 9 can be reduced (so-called peak shaving). Furthermore, a compact and cost-effective construction can be achieved. Additionally, a rapid and near-impactless switching between energy supply via the AC grid 9 and energy supply via the energy storage capacitor bank 11 can be realized.

[0065] In this patent application, nouns and pronouns referring to people generally do not specify a particular gender.

Claims

1. An energy supply device for an X-ray system, the X-ray system comprising an X-ray tube (1). - The energy supply device described therein has an input stage (3), an output stage (4) and an intermediate circuit (5). - The intermediate loop (5) has two lines (6, 7), which are connected to the input stage (3) and the output stage (4) respectively. - The two lines (6, 7) of the intermediate loop (5) have different potentials from each other, and the difference in potentials forms the intermediate loop voltage (U). - The input stage (3) is connected to the AC power grid (9) so that the input stage (3) can obtain electrical energy from the AC power grid (9) and transmit the obtained electrical energy to the intermediate circuit (5). - The output stage (4) is connected to the X-ray tube (1) so that the output stage (4) can extract electrical energy from the intermediate circuit (5) and convert the extracted electrical energy into high voltage and deliver it to the X-ray tube (1). - The energy supply device wherein the energy supply device has an electric energy storage system (10), and the electric energy storage system has an electric energy storage capacitor bank (11). Its features are, The energy storage system (10) has a converter circuit (12) on the energy storage side dedicated to the energy storage capacitor bank (11), and the energy storage capacitor bank (11) is connected to the intermediate circuit (5) via the converter circuit (12) on the energy storage side.

2. The energy supply device according to claim 1, Its features are, The converter circuit (12) on the energy storage side is configured as a combination of boost / buck converter, boost converter or buck converter.

3. The energy supply device according to claim 1 or 2, Its features are, The output stage (4) has an output-side converter (13), a high-voltage transformer (14), and an output-side rectifier (15). The output-side converter (13) converts the intermediate circuit voltage (U) into an output-side AC voltage. The high-voltage transformer (14) transforms the output-side AC voltage into a high voltage. The output-side rectifier (15) rectifies the high voltage and supplies it to the X-ray tube (1).

4. The energy supply device according to claim 1, 2 or 3, Its features are, The input stage (3) is configured such that the input stage limits the power obtained by the input stage (3) from the AC power grid (9).

5. The energy supply device according to claim 4, Its features are, The input stage (3) has an input-side rectifier (16) and an input-side converter circuit (17), the input-side rectifier (16) rectifies the input-side AC voltage provided by the AC power grid (9), and the input-side converter circuit (17) delivers the rectified input-side AC voltage to the intermediate circuit (5).

6. The energy supply device according to claim 5, Its features are, The input-side converter circuit (17) is configured as a boost converter.

7. The energy supply device according to any one of the preceding claims, Its features are, The energy storage side converter circuit (12) is equipped with a control device (18), the intermediate loop voltage (U) and the operating parameters (BG) of the energy storage device (11) are supplied to the control device (18), and the control device (18) determines the operation (C) of the energy storage side converter circuit (12) using only the intermediate loop voltage (U) and the operating parameters (BG) and possibly the operating parameters (BG') of the energy storage side converter circuit (12), and operates the energy storage side converter circuit (12) according to the determined operation (C).

8. The energy supply device according to claim 7, Its features are, A filter (19) is provided upstream of the control device (18). The intermediate circuit voltage (U) is filtered by the filter before it is supplied to the control device (18), so that the fluctuations of the intermediate circuit voltage (U) that remain after the AC voltage on the input side is rectified by the input stage (3) are filtered out.

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