Capacitor explosion-proof protection circuit, high voltage generator and digital X-ray photography system

Abstract

A capacitor explosion-proof protection circuit, a high voltage generator and a digital X-ray photography system are characterized in that a charging protection assembly is added between a power supply and an energy-storage capacitor bank to isolate charging loops of energy-storage capacitors in the energy-storage capacitor bank, and a discharging protection assembly is added between the energy-storage capacitor bank and a load to isolate the charging loops of the energy-storage capacitors in the energy-storage capacitor bank. Due to the fact that the discharging loop and the charging loop of each energy storage capacitor are isolated, when one or more energy storage capacitors have a short-circuit fault, the discharging loop of each energy storage capacitor in the energy storage capacitor bank is isolated from the charging loop of each energy storage capacitor. The charging protection assembly and the discharging protection assembly can prevent short-circuit current from influencing other energy storage capacitors which are not short-circuited, so that the circuit is protected from secondary damage, and accidents are prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of high-power pulse energy, and particularly to a capacitor explosion-proof protection circuit, a high-voltage generator, and a digital X-ray imaging system. Background Art

[0002] In electrical applications, large-capacity capacitors are often used for energy storage. For example, in the high-voltage generator of a digital X-ray imaging system, an energy storage capacitor bank is used to store the charging voltage to obtain an energy storage voltage, so that the subsequent circuit performs a high-voltage conversion process on the energy storage voltage to obtain an excitation voltage, and the excitation voltage is used to be applied to the X-ray source to enable the X-ray source to emit X-rays. In order to store more energy, multiple capacitors are usually connected in parallel for energy storage, and in order to apply to higher voltage occasions, multiple capacitors are usually connected in series to increase the withstand voltage; however, the more the number of series and parallel connections of capacitors, the greater the probability of a short-circuit fault occurring in a single capacitor, and once a capacitor short-circuit occurs, serious consequences may occur to the circuit.

[0003] To protect the circuit and prevent serious accidents, generally a fuse is currently connected in series at the end of each capacitor. When a capacitor short-circuit occurs, the short-circuit current flowing through will quickly blow the fuse, thereby protecting the circuit from secondary damage. However, this method also has the following defects:

[0004] 1. The large-current fuse itself is expensive, and in addition, a fuse holder needs to be added, which makes the circuit cost too high, the circuit volume also increases accordingly, and the installation time and labor cost are increased.

[0005] 2. The fuse blowing requires a current duration. When the short-circuit current duration is as short as the ms level, there is a possibility of untimely blowing, which may lead to protection failure. Summary of the Invention

[0006] Considering the above problems, the present invention provides a capacitor explosion-proof protection circuit, a high-voltage generator, and a digital X-ray imaging system, which are described in detail below.

[0007] In one embodiment, a high-voltage generator of a digital X-ray imaging system is provided, including:

[0008] A charging voltage providing circuit for providing a charging voltage;

[0009] An energy storage capacitor bank including energy storage capacitors for storing energy based on the charging voltage to obtain an energy storage voltage;

[0010] A high-voltage conversion circuit for performing a high-voltage conversion process on the energy storage voltage to obtain an excitation voltage, and the excitation voltage is used to be applied to the X-ray source to enable the X-ray source to emit X-rays;

[0011] A charging protection component and a discharging protection component, the charging protection component is connected between the charging voltage providing circuit and the energy storage capacitor bank, and the discharging protection component is connected between the energy storage capacitor bank and the high-voltage conversion circuit, for isolating the charging circuit and the discharging circuit of each energy storage capacitor;

[0012] Wherein,

[0013] The charging protection component includes a charging protection diode; the charging voltage providing circuit includes a charging voltage positive output terminal and a charging voltage negative output terminal; wherein: the anode of the charging protection diode is connected to the charging voltage positive output terminal, and the cathode of the charging protection diode is connected to the high-voltage end of the energy storage capacitor; and / or, the anode of the charging protection diode is connected to the low-voltage end of the energy storage capacitor, and the cathode of the charging protection diode is connected to the charging voltage negative output terminal;

[0014] The discharging protection component includes a discharging protection diode; the high-voltage conversion circuit includes an energy storage voltage positive input terminal and an energy storage voltage negative input terminal; wherein: the anode of the discharging protection diode is connected to the high-voltage end of the energy storage capacitor, and the cathode of the discharging protection diode is connected to the energy storage voltage positive input terminal; and / or, the anode of the discharging protection diode is connected to the energy storage voltage negative input terminal, and the cathode of the discharging protection diode is connected to the low-voltage end of the energy storage capacitor.

[0015] In one embodiment, it further includes:

[0016] An overcurrent protection component, the overcurrent protection component is connected between the charging voltage providing circuit and the charging protection component, and is used to disconnect the connection between the charging voltage providing circuit and the charging protection component when the current flowing through it exceeds a preset current value.

[0017] In one embodiment, the overcurrent protection component is a fuse.

[0018] In one embodiment, the energy storage capacitor bank includes a plurality of energy storage capacitors, the charging protection component includes a plurality of charging protection diodes, and the discharging protection component includes a plurality of discharging protection diodes. Among them, the plurality of energy storage capacitors form a plurality of parallel branches, and each branch is respectively connected in series with at least one charging protection diode among the plurality of charging protection diodes and / or each branch is respectively connected in series with at least one discharging protection diode among the plurality of discharging protection diodes.

[0019] In one embodiment, the energy storage capacitor bank includes a plurality of energy storage capacitors, wherein the plurality of energy storage capacitors are connected in parallel; alternatively, the plurality of energy storage capacitors include a plurality of first energy storage capacitors and a plurality of second energy storage capacitors, the plurality of first energy storage capacitors are connected in parallel, the plurality of second energy storage capacitors are connected in parallel, the first energy storage capacitors and the second energy storage capacitors correspond one by one, the low-voltage end of the first energy storage capacitor is connected to the high-voltage end of its corresponding second energy storage capacitor, and one end of the connection between the first energy storage capacitor and the second energy storage capacitor is used as a common terminal, and a plurality of the common terminals are connected.

[0020] In one embodiment, a high-voltage generator of a digital X-ray imaging system is provided, including:

[0021] A charging voltage providing circuit for providing a charging voltage;

[0022] An energy storage capacitor bank including energy storage capacitors for storing energy based on the charging voltage to obtain a stored energy voltage;

[0023] A high-voltage conversion circuit for performing a high-voltage conversion process on the stored energy voltage to obtain an excitation voltage, and the excitation voltage is used to be applied to an X-ray source to cause the X-ray source to emit X-rays;

[0024] A charging protection component, the charging protection component being connected between the charging voltage providing circuit and the energy storage capacitor bank;

[0025] Wherein, the charging protection component includes a charging protection diode; the charging voltage providing circuit includes a charging voltage positive output terminal and a charging voltage negative output terminal; wherein: the anode of the charging protection diode is connected to the charging voltage positive output terminal, and the cathode of the charging protection diode is connected to the high-voltage end of the energy storage capacitor; and / or, the anode of the charging protection diode is connected to the low-voltage end of the energy storage capacitor, and the cathode of the charging protection diode is connected to the charging voltage negative output terminal.

[0026] In one embodiment, a high-voltage generator of a digital X-ray imaging system is provided, including:

[0027] A charging voltage providing circuit for providing a charging voltage;

[0028] An energy storage capacitor bank including energy storage capacitors for storing energy based on the charging voltage to obtain a stored energy voltage;

[0029] A high-voltage conversion circuit for performing a high-voltage conversion process on the stored energy voltage to obtain an excitation voltage, and the excitation voltage is used to be applied to an X-ray source to cause the X-ray source to emit X-rays;

[0030] A discharge protection component, which is connected between the energy storage capacitor bank and the high-voltage conversion circuit;

[0031] Wherein, the discharge protection component includes a discharge protection diode; the high-voltage conversion circuit includes a positive input terminal of the energy storage voltage and a negative input terminal of the energy storage voltage; wherein: the anode of the discharge protection diode is connected to the high-voltage end of the energy storage capacitor, and the cathode of the discharge protection diode is connected to the positive input terminal of the energy storage voltage; and / or, the anode of the discharge protection diode is connected to the negative input terminal of the energy storage voltage, and the cathode of the discharge protection diode is connected to the low-voltage end of the energy storage capacitor.

[0032] In one embodiment, a capacitor explosion-proof protection circuit is provided for explosion-proof protection of a plurality of energy storage capacitors in the energy storage capacitor bank. The energy storage capacitor bank is connected between a power supply and a load. The capacitor explosion-proof protection circuit includes:

[0033] A charging protection component, which is connected between the power supply and the energy storage capacitor bank and is used for isolating the charging circuits of the respective energy storage capacitors;

[0034] A discharge protection component, which is connected between the energy storage capacitor bank and the load and is used for isolating the discharge circuits of the respective energy storage capacitors. Wherein,

[0035] The charging protection component includes a plurality of charging protection diodes. Wherein, the anode of the charging protection diode is connected to the positive pole of the power supply, and the cathode of the charging protection diode is connected to the high-voltage end of the energy storage capacitor; and / or, the anode of the charging protection diode is connected to the low-voltage end of the energy storage capacitor, and the cathode of the charging protection diode is connected to the negative pole of the power supply;

[0036] The discharge protection component includes a plurality of discharge protection diodes. Wherein, the anode of the discharge protection diode is connected to the high-voltage end of the energy storage capacitor, and the cathode of the discharge protection diode is connected to one end of the load; and / or, the anode of the discharge protection diode is connected to the other end of the load, and the cathode of the discharge protection diode is connected to the low-voltage end of the energy storage capacitor.

[0037] In one embodiment, it further includes:

[0038] An overcurrent protection component, which is connected between the positive pole of the power supply and the charging protection component and is used for disconnecting the connection between the positive pole of the power supply and the charging protection component when the current flowing through it exceeds a preset current value.

[0039] In one embodiment, the overcurrent protection component is a fuse.

[0040] In one embodiment, a digital X-ray imaging system is provided, including:

[0041] A high-voltage generator as described in any of the above embodiments, the high-voltage generator being configured to generate an excitation voltage;

[0042] An X-ray source configured to emit X-rays when the excitation voltage is applied thereto, the X-rays being configured to be directed at a target to be detected;

[0043] A detector configured to receive the X-rays that have passed through the target to be detected and convert the received X-rays into a digital image.

[0044] According to the capacitor explosion-proof protection circuit, high-voltage generator, and digital X-ray imaging system of the above embodiments, a charging protection component is added between the power supply and the energy storage capacitor bank to isolate the charging circuits of the individual energy storage capacitors in the energy storage capacitor bank, and a discharging protection component is added between the energy storage capacitor bank and the load to isolate the discharging circuits of the individual energy storage capacitors in the energy storage capacitor bank. Since the discharging circuits and charging circuits of each energy storage capacitor are isolated, when one or more energy storage capacitors have a short-circuit fault, the charging protection component and the discharging protection component can prevent the short-circuit current from affecting other non-shorted energy storage capacitors, protecting the circuit from secondary damage and preventing accidents from occurring. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic structural diagram of a digital X-ray imaging system according to an embodiment;

[0046] Figure 2 A schematic structural diagram of a high-voltage generator according to an embodiment;

[0047] Figure 3 A schematic structural diagram of a high-voltage conversion circuit according to an embodiment;

[0048] Figure 4 A schematic structural diagram of a high-voltage generator according to another embodiment;

[0049] Figure 5 A schematic structural diagram of an X-ray source according to an embodiment;

[0050] Figure 6 A schematic circuit diagram of an energy storage capacitor bank according to an embodiment;

[0051] Figure 7 A schematic circuit diagram of an energy storage capacitor bank according to another embodiment;

[0052] Figure 8 A schematic circuit diagram of a charging protection component and a discharging protection component according to an embodiment;

[0053] Figure 9Schematic diagram of the circuit structure of the charging protection component and the discharging protection component for another embodiment;

[0054] Figure 10 Schematic diagram of the circuit structure of the charging protection component and the discharging protection component for yet another embodiment;

[0055] Figure 11 Schematic diagram of the circuit structure of the charging protection component and the discharging protection component for yet another embodiment;

[0056] Figure 12 Schematic diagram of the structure of the capacitor explosion-proof protection circuit for one embodiment;

[0057] Figure 13 Schematic diagram of the structure of the capacitor explosion-proof protection circuit for another embodiment. Detailed implementation manners

[0058] The present invention will be further described in detail below in conjunction with the accompanying drawings through specific implementation manners. Similar elements in different implementation manners are labeled with related similar element numbers. In the following implementation manners, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification, which is to avoid the core part of the present application being overwhelmed by excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the descriptions in the specification and the general technical knowledge in the art.

[0059] In addition, the features, operations, or characteristics described in the specification can be combined in any appropriate manner to form various implementation manners. At the same time, the steps or actions in the method description can also be reordered or adjusted in an obvious manner by those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for clearly describing a certain embodiment, and do not mean that they are the necessary sequences, unless it is stated that a certain sequence must be followed.

[0060] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connection (coupling).

[0061] In view of the problems existing in protecting the circuit by connecting a fuse in series on each energy storage capacitor, in the present invention, a charging protection component is connected to the charging circuit of each energy storage capacitor, and a discharging protection component is connected to the discharging circuit of each energy storage capacitor, so that the charging circuits and discharging circuits of the respective energy storage capacitors are isolated, more effectively avoiding the short-circuit fault of one or more energy storage capacitors and damaging the entire circuit. Moreover, the charging protection component and the discharging protection component are composed of diodes, and the unidirectional conduction characteristic of the diodes is used to realize the isolation of the charging circuits and discharging circuits of the respective energy storage capacitors. The circuit implementation is simple and has no great impact on the circuit volume, without spending a lot of time on installation, saving labor costs.

[0062] Please refer to Figure 1 , the digital radiography system may include: a high-voltage generator 101, an X-ray source 102, and a detector 103, which will be described in detail below.

[0063] The high-voltage generator 101 is used to generate an excitation voltage. Please refer to Figure 2 , and may include a charging voltage supply circuit 1011, a charging protection component 1012, an energy storage capacitor bank 1013, a discharging protection component 1014, and a high-voltage conversion circuit 1015.

[0064] The charging voltage supply circuit 1011 is used to perform voltage conversion processing on the input AC voltage to obtain a charging voltage. The charging voltage supply circuit 1011 is used to convert the AC voltage input from the power grid into a DC voltage, that is, to obtain a charging voltage. In one embodiment, the charging voltage supply circuit 1011 may also boost the converted DC voltage so that the voltage value of the DC voltage meets the voltage required for charging the energy storage capacitors in the energy storage capacitor bank 1013.

[0065] The energy storage capacitor bank 1013 may include one energy storage capacitor or may include multiple energy storage capacitors. In this article, the case of multiple energy storage capacitors is taken as an example for description.

[0066] As Figure 6 shown, the energy storage capacitor bank 1013 includes multiple energy storage capacitors, which are used to store the charging voltage to obtain a stored energy voltage. Since the charging voltage that the charging voltage supply circuit 1011 can provide is very high, therefore, when exposure is not required, the energy storage capacitor bank 1013 will maintain a high voltage and store sufficient energy. When exposure is required, the energy storage capacitor bank 1013 provides power for the high-voltage conversion circuit 1015 and at the same time provides high-power energy for the exposure of the X-ray tube in the X-ray source 102. In this embodiment, the charging voltage output by the charging voltage supply circuit 1011 is used to charge the energy storage capacitor bank 1013, and the energy storage capacitor bank is used for energy storage to provide sufficient energy for exposure. The energy storage capacitor bank 1013 is usually a series-parallel combination of multiple energy storage capacitors, and some energy storage capacitor banks 1013 can also change their capacitance values through a changeover switch.

[0067] The high-voltage conversion circuit 1015 is used to perform high-voltage conversion processing on the energy storage voltage to obtain an excitation voltage, and the excitation voltage is used to be applied to the X-ray source 102 so that the X-ray source 102 emits X-rays.

[0068] Please refer to Figure 3 , the high-voltage conversion circuit 1015 includes an inverter 201 and a high-voltage oil tank 202. The input end of the inverter 201 is connected to the energy storage capacitor bank 1013, and the output end of the inverter 101 is connected to the high-voltage oil tank 202. The inverter 201 is used to obtain power from the energy storage capacitor bank 1013 and invert and output high-frequency alternating current to the high-voltage oil tank 202. For example, it is inverted into a high-frequency power supply of 20 kHz and input to the high-voltage oil tank 202. The high-voltage oil tank 202, as a high-voltage generating device, is usually used to apply an excitation voltage to the X-ray source 102. In other embodiments, the high-voltage generating device can also generate high voltage by other means or devices.

[0069] The charging protection component 1012 is connected between the charging voltage providing circuit 1011 and the energy storage capacitor bank 1013, and is used to isolate the charging circuits of the individual energy storage capacitors in the energy storage capacitor bank 1013. Among them, the charging circuit of the energy storage capacitor is the circuit in which the charging voltage providing circuit 1011 charges the energy storage capacitor.

[0070] The discharge protection component 1014 is connected between the energy storage capacitor bank 1013 and the high-voltage conversion circuit 1015, and is used to isolate the discharge circuits of the individual energy storage capacitors in the energy storage capacitor bank 1013. Among them, the charging circuit of the energy storage capacitor is the circuit in which the energy storage capacitor discharges the electrical energy stored therein to the high-voltage conversion circuit 1015.

[0071] In an embodiment where the energy storage capacitor bank includes a plurality of energy storage capacitors, the charging protection component 1012 may include a plurality of charging protection diodes, and the discharge protection component 1014 may include a plurality of discharge protection diodes. The plurality of energy storage capacitors can form a plurality of parallel branches, and each branch can be respectively connected in series with at least one of the plurality of charging protection diodes, and / or each branch can be respectively connected in series with at least one of the plurality of discharge protection diodes. Details are as follows.

[0072] In some embodiments, the charging protection component 1012 includes a plurality of charging protection diodes; wherein: the anode of the charging protection diode is connected to the positive-phase output end of the charging voltage providing circuit 1011, and the cathode of the charging protection diode is connected to the high-voltage end of the energy storage capacitor; and / or, the anode of the charging protection diode is connected to the low-voltage end of the energy storage capacitor, and the cathode of the charging protection diode is connected to the negative-phase output end of the charging voltage providing circuit 1011.

[0073] In some embodiments, the discharge protection component 1014 includes a plurality of discharge protection diodes; wherein: the anode of the discharge protection diode is connected to the high-voltage end of the energy storage capacitor, and the cathode of the discharge protection diode is connected to the positive-phase input end of the high-voltage conversion circuit 1015; and / or, the anode of the discharge protection diode is connected to the negative-phase input end of the high-voltage conversion circuit 1015, and the cathode of the discharge protection diode is connected to the low-voltage end of the energy storage capacitor.

[0074] In some embodiments, the high-voltage generator 101 may also include only the charging protection component 1012 or only the discharge protection component 1014.

[0075] In some embodiments, please refer to Figure 4 , the high-voltage generator 101 may further include an overcurrent protection component 1016. The overcurrent protection component 1016 is connected between the charging voltage supply circuit 1011 and the charging protection component 1012, and is configured to disconnect the connection between the charging voltage supply circuit 1011 and the charging protection component 1012 when the current flowing through it exceeds a preset current value. When a short-circuit fault occurs in the energy storage capacitor, if the diodes in the charging protection component 1012 and / or the discharge protection component 1014 also have short-circuit faults, at this time, the current flowing through the above overcurrent protection component will be very large, enabling it to quickly disconnect the connection between the positive pole of the power supply DC and the charging protection component 1012 to further reduce the risk. In one embodiment, the overcurrent protection component may be a fuse.

[0076] Please refer to Figure 5 , the X-ray source 102 includes an X-ray tube 203. The X-ray tube 203 is connected to the high-voltage oil tank 202 and is configured to generate X-rays under the action of an excitation voltage.

[0077] In some embodiments, the high-voltage generator 101 may further include a control circuit. The control circuit is respectively connected to the X-ray tube 203 in the X-ray source 102 and the inverter 201 in the high-voltage generator 101, and is configured to control the operation of the inverter according to an exposure request, that is, to obtain high-voltage direct current from the energy storage capacitor bank 1013 and output high-frequency alternating current through inversion. At the same time, the control circuit is also connected to the X-ray tube 203, and feeds back the voltage and current output by the X-ray tube 203 to the control circuit, and compares them with the voltage value and current value set in the control circuit to control and adjust the exposure amount output by the X-ray tube 203.

[0078] Detector 103 is used to receive X-rays passing through the target to be detected and convert the received X-rays into a digital image. Among them, detector 103 further includes a ray conversion layer and a TFT matrix layer. The ray conversion layer is used to convert radioactive rays such as X-rays into visible light; generally, a scintillation layer or a fluorescent layer is included in the ray conversion to convert the rays into visible light. Taking the scintillation layer as an example, it can generally be made of a scintillation material. Typically, for example, it is cesium iodide (CsI) or gadolinium oxysulfide (GOS), etc. The TFT matrix layer is used to sense the visible light converted by the ray conversion layer and convert the visible light into an electrical signal for image information acquisition.

[0079] In this embodiment, since the charging circuit and the discharging circuit of each energy storage capacitor in the energy storage capacitor bank 1013 are respectively isolated by the charging protection component 1012 and the discharging protection component 1014, when a certain energy storage capacitor fails, it will neither affect the normal operation of the system nor cause damage to other energy storage capacitors, thereby improving the safety of the high-voltage generator 101 in the digital X-ray imaging system in terms of design.

[0080] There can be multiple connection methods among the multiple energy storage capacitors in the energy storage capacitor bank 1013. In this embodiment, the parallel connection and the series-parallel connection of multiple energy storage capacitors are taken as examples for the following description. It should be noted that in the circuit described below, the input end of the energy storage capacitor bank 1013 is connected to the power supply DC to provide a charging voltage, and the output end of the energy storage capacitor bank 1013 is connected to the resistor R1 for discharging. In this embodiment, the power supply DC can be the charging voltage providing circuit 1011, and the resistor R1 can be the high-voltage conversion circuit 1015. In other embodiments, the power supply DC and the resistor R1 can also be other circuits or devices, which will not be elaborated here.

[0081] In some embodiments, multiple energy storage capacitors are connected in parallel. Please refer to Figure 6 , the energy storage capacitor bank 1013 includes multiple energy storage capacitors (C1, C2,..., Cn), and the multiple energy storage capacitors (C1, C2,..., Cn) are connected in parallel. Among them, the energy storage capacitors (C1, C2,..., Cn) have a high-voltage end and a low-voltage end. The high-voltage ends of the energy storage capacitors (C1, C2,..., Cn) are connected to form the first end of the energy storage capacitor bank 1013, and the low-voltage ends of the energy storage capacitors (C1, C2,..., Cn) are connected to form the second end of the energy storage capacitor bank 1013. The first end of the energy storage capacitor bank 1013 is connected to the positive pole of the power supply DC and one end of the resistor R1, and the second end of the energy storage capacitor bank 1013 is connected to the negative pole of the power supply DC and the other end of the resistor R1.

[0082] In some embodiments, multiple energy storage capacitors are connected in series-parallel. Please refer to Figure 7, the energy storage capacitor bank 1013 includes a plurality of first energy storage capacitors (C11, C12, …, C1n) and a plurality of second energy storage capacitors (C21, C22, …, C2n). The plurality of first energy storage capacitors (C11, C12, …, C1n) are connected in parallel with each other, and the plurality of second energy storage capacitors (C21, C22, …, C2n) are connected in parallel with each other. The first energy storage capacitors (C11, C12, …, C1n) and the second energy storage capacitors (C21, C22, …, C2n) correspond one by one, that is, the first energy storage capacitor C11 corresponds to the second energy storage capacitor C21, …, the first energy storage capacitor C1n corresponds to the second energy storage capacitor C2n. The low-voltage ends of the first energy storage capacitors (C11, C12, …, C1n) are connected to the high-voltage ends of their corresponding second energy storage capacitors (C21, C22, …, C2n). The ends where the first energy storage capacitors (C11, C12, …, C1n) and the second energy storage capacitors (C21, C22, …, C2n) are connected are used as common terminals (P1, P2, …, Pn), and the plurality of common terminals (P1, P2, …, Pn) are connected. Among them, the first energy storage capacitors (C11, C12, …, C1n) have high-voltage ends and low-voltage ends, and the second energy storage capacitors (C21, C22, …, C2n) have high-voltage ends and low-voltage ends. The high-voltage ends of the first energy storage capacitors (C11, C12, …, C1n) are the first ends of the energy storage capacitor bank 1013, and the low-voltage ends of the second energy storage capacitors (C21, C22, …, C2n) are the second ends of the energy storage capacitor bank 1013. The first end of the energy storage capacitor bank 1013 is connected to the positive electrode of the power supply DC and one end of the resistor R1, and the second end of the energy storage capacitor bank 1013 is connected to the negative electrode of the power supply DC and the other end of the resistor R1.

[0083] The above are some descriptions of the connection method of the energy storage capacitor bank 1013.

[0084] In some embodiments, taking the parallel connection of a plurality of energy storage capacitors (C1, C2, …, Cn) in the energy storage capacitor bank 1013 as an example. Please refer to Figure 8, the charging protection component 1012 includes a plurality of charging protection diodes (D11, D12, …, D1n), and there is a one-to-one correspondence between the charging protection diodes (D11, D12, …, D1n) and the energy storage capacitors (C1, C2, …, Cn). The anode of each charging protection diode (D11, D12, …, D1n) is connected to the positive pole of the power supply DC, and the cathode of each charging protection diode (D11, D12, …, D1n) is connected to the high-voltage end of its corresponding energy storage capacitor (C1, C2, …, Cn). The discharging protection component 1014 includes a plurality of discharging protection diodes (D21, D22, …, D2n), and there is a one-to-one correspondence between the discharging protection diodes (D11, D12, …, D1n) and the energy storage capacitors (C1, C2, …, Cn). The anode of each discharging protection diode (D21, D22, …, D2n) is connected to the high-voltage end of its corresponding energy storage capacitor (C1, C2, …, Cn), and the cathode of each discharging protection diode (D21, D22, …, D2n) is connected to one end of the resistor R1. In this way, when the energy storage capacitors in the energy storage capacitor bank 1013 are charged, the power supply DC charges its respective corresponding energy storage capacitors (C1, C2, …, Cn) through the respective charging protection diodes (D11, D12, …, D1n) in the charging protection component 1012. When the energy storage capacitors discharge, the energy storage capacitors (C1, C2, …, Cn) discharge to the resistor R1 through the discharging protection diodes (D11, D12, …, D1n) corresponding to them respectively. When a short-circuit fault occurs in a certain energy storage capacitor, for example, a short-circuit fault occurs in the energy storage capacitor C1, due to the unidirectional conduction characteristic of the diode, the other energy storage capacitors (C2, …, Cn) will be reversely blocked by their corresponding charging protection diodes and discharging protection diodes, which can prevent the other energy storage capacitors (C2, …, Cn) from discharging energy to the energy storage capacitor C1 and causing further damage.

[0085] In one embodiment, as Figure 9, the energy storage capacitor bank 1013 includes: energy storage capacitor C1 and energy storage capacitor C2, the charging protection component 1012 includes charging protection diode D11 and charging protection diode D12, and the discharging protection component 1014 includes discharging protection diode D21 and discharging protection diode D22. Among them, the anode of the charging protection diode D11 is connected to the positive pole of the power supply DC, the cathode of the charging protection diode D11 is connected to the high-voltage end of the energy storage capacitor C1 and the anode of the discharging protection diode D21, the low-voltage end of the energy storage capacitor C1 is connected to the negative pole of the power supply DC, the cathode of the discharging protection diode D21 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the negative pole of the power supply DC; the anode of the charging protection diode D12 is connected to the positive pole of the power supply DC, the cathode of the charging protection diode D12 is connected to the high-voltage end of the energy storage capacitor C2 and the anode of the discharging protection diode D22, the low-voltage end of the energy storage capacitor C2 is connected to the negative pole of the power supply DC, the cathode of the discharging protection diode D22 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the negative pole of the power supply DC. In one embodiment, the resistor R1 can be a load resistor.

[0086] In some other embodiments, please refer to Figure 10, taking the series and parallel connection of multiple energy storage capacitors in the energy storage capacitor bank 1013 as an example, that is, the energy storage capacitor bank 1013 includes multiple first energy storage capacitors (C11, C12, …, C1n) and multiple second energy storage capacitors (C21, C22, …, C2n); the charging protection component 1012 includes multiple first charging protection diodes (D31, D32, …, D3n) and multiple second charging protection diodes (D41, D42, …, D4n), the first charging protection diodes (D31, D32, …, D3n) correspond to the first energy storage capacitors (C11, C12, …, C1n) one by one, the second charging protection diodes (D41, D42, …, D4n) correspond to the second energy storage capacitors (C21, C22, …, C2n) one by one, the anode of each first charging protection diode (D31, D32, …, D3n) is connected to the positive pole of the power supply DC, the cathode of each first charging protection diode (D31, D32, …, D3n) is connected to the high-voltage end of the corresponding first energy storage capacitor (C11, C12, …, C1n), the anode of each second charging protection diode (D41, D42, …, D4n) is connected to the low-voltage end of the corresponding first energy storage capacitor (C11, C12, …, C1n), and the cathode of each first charging protection diode (D31, D32, …, D3n) is connected to the negative pole of the power supply DC; the discharging protection component 1014 includes multiple first discharging protection diodes (D51, D52, …, D5n) and multiple second discharging protection diodes (D61, D62, …, D6n), the first discharging protection diodes (D51, D52, …, D5n) correspond to the first energy storage capacitors (C11, C12, …, C1n) one by one, the second discharging protection diodes (D61, D62, …, D6n) correspond to the second energy storage capacitors (C21, C22, …, C2n) one by one, the anode of each first discharging protection diode (D51, D52, …, D5n) is connected to the high-voltage end of the corresponding second energy storage capacitor (C21, C22, …, C2n), the cathode of each first discharging protection diode (D51, D52, …, D5n) is connected to one end of the resistor R1, the anode of each second discharging protection diode (D61, D62, …, D6n) is connected to the other end of the resistor R1, and the cathode of each second discharging protection diode (D61, D62, …, D6n) is connected to the low-voltage end of the corresponding second energy storage capacitor (C21, C22, …, C2n).In this way, when the energy storage capacitors in the energy storage capacitor bank 1013 are charged, the power supply DC charges the first energy storage capacitors (C11, C12, …, C1n) and the second energy storage capacitors (C21, C22, …, C2n) through the first charge protection diodes (D31, D32, …, D3n) and the second charge protection diodes (D41, D42, …, D4n) in the charge protection component 1012. When the energy storage capacitors discharge, the first energy storage capacitors (C11, C12, …, C1n) and the second energy storage capacitors (C21, C22, …, C2n) discharge to the resistor R1 through the first discharge protection diodes (D51, D52, …, D5n) and the second discharge protection diodes (D61, D62, …, D6n) in the discharge protection component 1014. When a short circuit fault occurs in a certain energy storage capacitor, for example, a short circuit fault occurs in the first energy storage capacitor C11, due to the one-way conduction characteristic of the diode, other energy storage capacitors will be reversely blocked by their corresponding charge protection diodes and discharge protection diodes, which can prevent other energy storage capacitors from discharging energy to the first energy storage capacitor C1 and causing further damage.

[0087] In one embodiment, as Figure 11, the energy storage capacitor bank 1013 includes: the first energy storage capacitor C11, the first energy storage capacitor C12, the second energy storage capacitor C21, and the second energy storage capacitor C22. The charging protection component 1012 includes the first charging protection diode D31, the first charging protection diode D32, the second charging protection diode D41, and the second charging protection diode D42. The discharging protection component 1014 includes the first discharging protection diode D51, the first discharging protection diode D52, the second discharging protection diode D61, and the second discharging protection diode D62. Among them, the anodes of the first charging protection diode D31 and the first charging protection diode D32 are connected to the positive pole of the power supply DC. The cathode of the first charging protection diode D31 is connected to the high-voltage end of the first energy storage capacitor C11. The cathode of the first charging protection diode D32 is connected to the high-voltage end of the first energy storage capacitor C12. The low-voltage end of the first energy storage capacitor C11 is connected to the high-voltage end of the second energy storage capacitor C21 to form a common terminal P1. The low-voltage end of the first energy storage capacitor C12 is connected to the high-voltage end of the second energy storage capacitor C22 to form a common terminal P2. The common terminal P1 is connected to the common terminal P2. The anode of the second charging protection diode D41 is connected to the low-voltage end of the second energy storage capacitor C21. The anode of the second charging protection diode D42 is connected to the low-voltage end of the second energy storage capacitor C22. The cathodes of the second charging protection diode D41 and the second charging protection diode D42 are connected to the negative pole of the power supply DC. The anode of the first discharging protection diode D51 is connected to the high-voltage end of the first energy storage capacitor C11. The anode of the first discharging protection diode D52 is connected to the high-voltage end of the first energy storage capacitor C12. The cathodes of the first discharging protection diode D51 and the first discharging protection diode D52 are connected to one end of the resistor R1. The anodes of the second discharging protection diode D61 and the second discharging protection diode D62 are connected to the other end of the resistor R1. The cathode of the second discharging protection diode D61 is connected to the low-voltage end of the second energy storage capacitor C21. The cathode of the second discharging protection diode D62 is connected to the low-voltage end of the second energy storage capacitor C22.

[0088] In the above circuit structure, the positive pole of the power supply DC is also connected with a fuse F1. When the energy storage capacitor and the charging protection diode (discharging protection diode) are short-circuited simultaneously, the fuse F1 will quickly blow to further reduce the risk.

[0089] The above are some examples of the charging protection component 1012 and the discharging protection component 1014 of the energy storage capacitor bank 1013 in the parallel connection and series-parallel connection modes. Those skilled in the art can understand that the charging protection component 1012 and the discharging protection component 1014 can also be realized by other circuits, which will not be elaborated one by one in this embodiment.

[0090] Please refer to Figure 12, An embodiment of the present invention provides a capacitor explosion-proof protection circuit. The capacitor explosion-proof protection circuit is used to provide explosion-proof protection for a plurality of energy storage capacitors in the energy storage capacitor bank 303. The energy storage capacitor bank 303 is connected between the power supply 301 and the load 305. The capacitor explosion-proof protection circuit may include: a charging protection component 302 and a discharging protection component 303, which will be described in detail below.

[0091] The charging protection component 302 is connected between the power supply 301 and the energy storage capacitor bank 303, and is used to isolate the charging circuits of the respective energy storage capacitors. Among them, the charging circuit of the energy storage capacitor is the circuit in which the power supply DC charges the energy storage capacitor.

[0092] The discharging protection component 304 is connected between the energy storage capacitor bank 303 and the load 30, and is used to isolate the discharging circuits of the respective energy storage capacitors. Among them, the charging circuit of the energy storage capacitor is the circuit in which the energy storage capacitor discharges the stored electric energy to the load.

[0093] In some embodiments, the charging protection component 302 includes a plurality of charging protection diodes; wherein: the anode of the charging protection diode is connected to the positive pole of the power supply 301, and the cathode of the charging protection diode is connected to the high-voltage end of the energy storage capacitor; and / or, the anode of the charging protection diode is connected to the low-voltage end of the energy storage capacitor, and the cathode of the charging protection diode is connected to the negative pole of the power supply 301.

[0094] In some embodiments, the discharging protection component 1014 includes a plurality of discharging protection diodes; wherein: the anode of the discharging protection diode is connected to the high-voltage end of the energy storage capacitor, and the cathode of the discharging protection diode is connected to one end of the load 305; and / or, the anode of the discharging protection diode is connected to the other end of the load 305, and the cathode of the discharging protection diode is connected to the low-voltage end of the energy storage capacitor.

[0095] Please refer to Figure 13 , The capacitor explosion-proof protection circuit may further include: an overcurrent protection component 306. The overcurrent protection component 306 is connected between the positive pole of the power supply 301 and the charging protection component 302, and is used to disconnect the connection between the positive pole of the power supply 301 and the charging protection component 302 when the current flowing through it exceeds a preset current value. In one embodiment, the overcurrent protection component is a fuse.

[0096] The specific implementation manners of the above-mentioned energy storage capacitor bank 303 and the charging protection component 302, discharging protection component 303, and overcurrent protection component 306 in the capacitor explosion-proof protection circuit have been described in detail in the above embodiments, and will not be elaborated here. It should be noted that in the circuit shown above Figures 6 - 11 , the power supply DC is the DC voltage source 301, and the resistor R1 is the load 305.

[0097] The above uses specific examples to illustrate the present invention, which is only for helping to understand the present invention and is not intended to limit the present invention. For those skilled in the art to which the present invention pertains, based on the idea of the present invention, several simple deductions, deformations or substitutions can also be made.

Claims

1. A high-voltage generator for a digital X-ray imaging system, characterized in that, it includes: A charging voltage supply circuit for supplying a charging voltage; A energy storage capacitor bank, including energy storage capacitors, for storing energy based on the charging voltage to obtain a stored energy voltage; A high-voltage conversion circuit for performing high-voltage conversion processing on the stored energy voltage to obtain an excitation voltage, and the excitation voltage is used to be applied to the X-ray source to enable the X-ray source to emit X-rays; A charging protection component and a discharging protection component, the charging protection component is connected between the charging voltage supply circuit and the energy storage capacitor bank, and the discharging protection component is connected between the energy storage capacitor bank and the high-voltage conversion circuit, for isolating the charging circuit and the discharging circuit of each energy storage capacitor; wherein, the charging protection component includes a charging protection diode; the charging voltage supply circuit includes a charging voltage positive output terminal and a charging voltage negative output terminal; wherein: the anode of the charging protection diode is connected to the charging voltage positive output terminal, and the cathode of the charging protection diode is connected to the high-voltage end of the energy storage capacitor; and / or, the anode of the charging protection diode is connected to the low-voltage end of the energy storage capacitor, and the cathode of the charging protection diode is connected to the charging voltage negative output terminal; the discharging protection component includes a discharging protection diode; the high-voltage conversion circuit includes a stored energy voltage positive input terminal and a stored energy voltage negative input terminal; wherein: the anode of the discharging protection diode is connected to the high-voltage end of the energy storage capacitor, and the cathode of the discharging protection diode is connected to the stored energy voltage positive input terminal; and / or, the anode of the discharging protection diode is connected to the stored energy voltage negative input terminal, and the cathode of the discharging protection diode is connected to the low-voltage end of the energy storage capacitor.

2. The high-voltage generator according to claim 1, characterized in that, it further includes: An overcurrent protection component, which is connected between the charging voltage supply circuit and the charging protection component, and is used to disconnect the connection between the charging voltage supply circuit and the charging protection component when the current flowing through it exceeds a preset current value.

3. The high-voltage generator according to claim 2, characterized in that, the overcurrent protection component is a fuse.

4. The high-voltage generator according to any one of claims 1-3, characterized in that: the energy storage capacitor bank includes a plurality of energy storage capacitors, the charging protection component includes a plurality of charging protection diodes, and the discharging protection component includes a plurality of discharging protection diodes. Among them, the plurality of energy storage capacitors form a plurality of parallel branches, and each branch is respectively connected in series with at least one charging protection diode among the plurality of charging protection diodes and / or each branch is respectively connected in series with at least one discharging protection diode among the plurality of discharging protection diodes.

5. The high-voltage generator according to any one of claims 1-3, characterized in that: the energy storage capacitor bank includes a plurality of energy storage capacitors, wherein, the plurality of energy storage capacitors are connected in parallel; or The multiple energy storage capacitors include multiple first energy storage capacitors and multiple second energy storage capacitors. The multiple first energy storage capacitors are connected in parallel, and the multiple second energy storage capacitors are connected in parallel. The first energy storage capacitors and the second energy storage capacitors correspond one by one. The low-voltage end of the first energy storage capacitor is connected to the high-voltage end of its corresponding second energy storage capacitor. One end of the connection between the first energy storage capacitor and the second energy storage capacitor is used as a common terminal, and multiple said common terminals are connected.

6. A high-voltage generator for a digital X-ray imaging system, characterized in that, it includes: a charging voltage providing circuit for providing a charging voltage; an energy storage capacitor bank including energy storage capacitors for storing energy based on the charging voltage to obtain a stored energy voltage; a high-voltage conversion circuit for performing high-voltage conversion processing on the stored energy voltage to obtain an excitation voltage, and the excitation voltage is used to be applied to an X-ray source to enable the X-ray source to emit X-rays; a charging protection component, and the charging protection component is connected between the charging voltage providing circuit and the energy storage capacitor bank; wherein, the charging protection component includes a charging protection diode; the charging voltage providing circuit includes a charging voltage positive output terminal and a charging voltage negative output terminal; wherein: the anode of the charging protection diode is connected to the charging voltage positive output terminal, and the cathode of the charging protection diode is connected to the high-voltage end of the energy storage capacitor; and / or, the anode of the charging protection diode is connected to the low-voltage end of the energy storage capacitor, and the cathode of the charging protection diode is connected to the charging voltage negative output terminal.

7. A high-voltage generator for a digital X-ray imaging system, characterized in that, it includes: a charging voltage providing circuit for providing a charging voltage; an energy storage capacitor bank including energy storage capacitors for storing energy based on the charging voltage to obtain a stored energy voltage; a high-voltage conversion circuit for performing high-voltage conversion processing on the stored energy voltage to obtain an excitation voltage, and the excitation voltage is used to be applied to an X-ray source to enable the X-ray source to emit X-rays; a discharging protection component, and the discharging protection component is connected between the energy storage capacitor bank and the high-voltage conversion circuit; wherein, the discharging protection component includes a discharging protection diode; the high-voltage conversion circuit includes a stored energy voltage positive input terminal and a stored energy voltage negative input terminal; wherein: the anode of the discharging protection diode is connected to the high-voltage end of the energy storage capacitor, and the cathode of the discharging protection diode is connected to the stored energy voltage positive input terminal; and / or, the anode of the discharging protection diode is connected to the stored energy voltage negative input terminal, and the cathode of the discharging protection diode is connected to the low-voltage end of the energy storage capacitor.

8. A capacitor explosion-proof protection circuit for performing explosion-proof protection on multiple energy storage capacitors in an energy storage capacitor bank, and the energy storage capacitor bank is connected between a power supply and a load, characterized in that, the capacitor explosion-proof protection circuit includes: a charging protection component, and the charging protection component is connected between the power supply and the energy storage capacitor bank for isolating the charging circuits of the respective energy storage capacitors; A discharge protection component, which is connected between the energy storage capacitor bank and the load, and is used to isolate the discharge circuits of each energy storage capacitor. Among them, The charging protection component includes a plurality of charging protection diodes. Among them, the anode of the charging protection diode is connected to the positive electrode of the power supply, and the cathode of the charging protection diode is connected to the high-voltage end of the energy storage capacitor; and / or, the anode of the charging protection diode is connected to the low-voltage end of the energy storage capacitor, and the cathode of the charging protection diode is connected to the negative electrode of the power supply; The discharge protection component includes a plurality of discharge protection diodes. Among them, the anode of the discharge protection diode is connected to the high-voltage end of the energy storage capacitor, and the cathode of the discharge protection diode is connected to one end of the load; and / or, the anode of the discharge protection diode is connected to the other end of the load, and the cathode of the discharge protection diode is connected to the low-voltage end of the energy storage capacitor.

9. The capacitor explosion-proof protection circuit according to claim 8, characterized in that, further comprising: an overcurrent protection component, which is connected between the positive electrode of the power supply and the charging protection component, and is used to disconnect the connection between the positive electrode of the power supply and the charging protection component when the current flowing through it exceeds a preset current value.

10. The capacitor explosion-proof protection circuit according to claim 9, characterized in that, the overcurrent protection component is a fuse.

11. A digital X-ray imaging system, characterized in that, comprising: a high-voltage generator according to any one of claims 1 to 7, which is used to generate an excitation voltage; an X-ray source, which is used to emit X-rays when the excitation voltage is applied, and the X-rays are used to irradiate the object to be detected; a detector, which is used to receive the X-rays passing through the object to be detected and convert the received X-rays into a digital image.

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