Multi-voltage output circuit, gate structure voltage control circuit and X-ray equipment

Abstract

The invention provides a multi-voltage output circuit, a gate structure voltage control circuit, a multi-voltage output method, a gate structure voltage control method and X-ray equipment, a voltage establishing unit provides input voltage for a power amplification circuit according to a preset output range of the multi-voltage output circuit, and the power amplification circuit is set to work in a linear region, so that the output voltage of the power amplification circuit is increased; a control circuit outputs a voltage control signal to a base control port of a power amplification circuit, and a voltage output port of the power amplification circuit is controlled to output any voltage in a preset output range as target voltage, so that multiple continuous voltages are output based on the same hardware structure; the problem that an existing voltage control structure can only be switched among limited levels is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to a multi-voltage output circuit, a gate structure voltage control circuit, a multi-voltage output method, a gate structure voltage control method, and an X-ray device. Background Art

[0002] X-ray devices are divided into industrial X-ray devices and medical X-ray devices. Medical X-ray devices require special coping methods for certain parts and scanning functions, including methods for quickly switching the tube current of X-ray devices. There are various ways to implement the structure for the quick on / off function of the tube current of X-ray devices. According to the cathode structure of X-ray devices, they can be roughly divided into two categories: non-independent grid control type and independent grid control type.

[0003] In imaging devices such as computed tomography (CT), digital subtraction angiography (DSA), and X-ray machines that use X-ray devices to generate X-rays, an X-ray tube with an independent grid control structure can control the beam current in the X-ray device by changing the voltage of the grid structure in the X-ray tube, thereby realizing functions such as beam switching, current magnitude adjustment, focal spot size adjustment, and focal spot position adjustment. The grid structure voltage refers to the voltage of the grid relative to the cathode in the X-ray device, that is, the voltage difference between the grid and the cathode with the cathode as the reference ground. The widest range of the grid structure voltage is within plus or minus dozens of kV and can be zero.

[0004] In the current design, the grid structure voltage switches between two or a limited number of levels, and it is impossible to quickly switch to any level within the grid voltage control range, which will limit the grid control function. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi-voltage output circuit, a gate structure voltage control circuit, a multi-voltage output method, a gate structure voltage control method, and an X-ray device, aiming to solve the problem that the traditional grid structure voltage switches between two or a limited number of levels and cannot quickly switch to any level within the grid voltage control range.

[0006] To solve the above technical problems, the first aspect of the embodiments of the present application provides a multi-voltage output circuit, including:

[0007] A power amplification circuit, the power amplification circuit operating in the linear region; the power amplification circuit includes a base control port, a voltage input port, and a voltage output port;

[0008] A voltage establishing unit, the magnitude of the voltage of the voltage establishing unit is determined according to the preset output range of the multi-voltage output circuit, and the voltage establishing unit is connected to the voltage input port; the voltage establishing unit is used to provide an input voltage for the power amplifier circuit;

[0009] A control circuit, the control circuit is connected to the base control port; the control circuit is used to control the voltage output port of the power amplifier circuit to output a target voltage according to a voltage control signal; the target voltage is any voltage within the preset output range.

[0010] In some embodiments, the power amplifier circuit includes a first amplifier tube circuit and a second amplifier tube circuit; the voltage input port includes a first voltage input port and a second voltage input port; the voltage establishing unit includes a first voltage establishing unit and a second voltage establishing unit;

[0011] The base control port of the first amplifier tube circuit and the base control port of the second amplifier tube circuit are connected to the control circuit; the first voltage input port of the first amplifier tube circuit is connected to the first voltage establishing unit, and the second voltage input port of the second amplifier tube circuit is connected to the second voltage establishing unit; the first voltage output port of the first amplifier tube circuit and the second voltage output port of the second amplifier tube circuit are connected to the voltage output port.

[0012] In some embodiments, the first voltage establishing unit is set to provide a positive voltage, and the second voltage establishing unit is set to provide a negative voltage.

[0013] In some embodiments, a voltage bias circuit is provided between the power amplifier circuit and the control circuit;

[0014] The base control port of the first amplifier tube circuit and the base control port of the second amplifier tube circuit are connected to the control circuit through the voltage bias circuit.

[0015] In some embodiments, the power amplifier circuit includes an amplifier tube circuit;

[0016] The base control port of the amplifier tube circuit is connected to the control circuit; the voltage input port of the amplifier tube circuit is connected to the voltage establishing unit; the voltage output port of the amplifier tube circuit is set as the voltage output port of the power amplifier circuit.

[0017] In some embodiments, the power amplification circuit includes a plurality of amplifier transistor circuits. The amplifier transistor circuits are connected to each other through the voltage output port of one amplifier transistor circuit to the base control port of another amplifier transistor circuit to form a multi-stage amplifier transistor circuit. The base control port of the first amplifier transistor circuit in the multi-stage amplifier transistor circuit is used to connect to the control circuit, and the voltage output port of the last amplifier transistor circuit is set as the voltage output port of the power amplification circuit.

[0018] In some embodiments, the power amplification circuit includes a plurality of amplifier transistor circuits. The voltage output port of the previous amplifier transistor circuit is connected to the voltage input port of the next amplifier transistor circuit to form a multi-stage amplifier transistor circuit. The base control port of at least one amplifier transistor circuit in the multi-stage amplifier transistor circuit is connected to the control circuit. The voltage input port of the first amplifier transistor circuit in the multi-stage amplifier transistor circuit is connected to the voltage establishing unit, and the voltage output port of the last amplifier transistor circuit is set as the voltage output port of the power amplification circuit.

[0019] In a second aspect of the embodiments of the present application, a gate structure voltage control circuit is further provided for controlling the voltage of the gate structure in the X-ray tube. The gate structure voltage control circuit includes:

[0020] A power amplification circuit that operates in the linear region. The power amplification circuit includes a base control port, a voltage input port, and a voltage output port.

[0021] A voltage establishing unit whose voltage magnitude is determined according to the voltage requirement range of the gate structure in the X-ray tube. The voltage establishing unit is connected to the voltage input port. The voltage establishing unit is used to provide an input voltage for the power amplification circuit.

[0022] A control circuit that is connected to the base control port. The control circuit is used to control the voltage output port to output the target voltage of the gate structure after receiving an output voltage control signal. The target voltage of the gate structure is any voltage within the preset output range.

[0023] Wherein, the voltage output port is connected to the gate structure in the X-ray tube for providing a gate structure voltage for the gate structure in the X-ray tube.

[0024] In some embodiments, the power amplification circuit includes a first amplifier transistor circuit and a second amplifier transistor circuit. The voltage input port includes a first voltage input port and a second voltage input port. The voltage establishing unit includes a first voltage establishing unit and a second voltage establishing unit.

[0025] The base control port of the first amplifying tube circuit and the base control port of the second amplifying tube circuit are connected to the control circuit; the first voltage input port of the first amplifying tube circuit is connected to the first voltage establishing unit, and the second voltage input port of the second amplifying tube circuit is connected to the second voltage establishing unit; the first voltage output port of the first amplifying tube circuit and the second voltage output port of the second amplifying tube circuit are connected to the voltage output port.

[0026] In some embodiments, the first voltage establishing unit is configured to provide a positive voltage, and the second voltage establishing unit is configured to provide a negative voltage.

[0027] In some embodiments, the control circuit is further configured to provide a bias voltage signal to the base control port; or

[0028] A voltage bias circuit is provided between the power amplifying circuit and the control circuit;

[0029] The base control port of the first amplifying tube circuit and the base control port of the second amplifying tube circuit are connected to the control circuit through the voltage bias circuit.

[0030] In some embodiments, the power amplifying circuit includes an amplifying tube circuit;

[0031] The base control port of the amplifying tube circuit is connected to the control circuit; the voltage input port of the amplifying tube circuit is connected to the voltage establishing unit; the voltage output port of the amplifying tube circuit is set as the voltage output port of the power amplifying circuit.

[0032] In some embodiments, the power amplifying circuit includes a plurality of amplifying tube circuits. The amplifying tube circuits are connected to form a multi-stage amplifying tube circuit by connecting the voltage output port of one amplifying tube circuit to the base control port of another amplifying tube circuit. The base control port of the first amplifying tube circuit in the multi-stage amplifying tube circuit is used to connect to the control circuit, and the voltage output port of the last amplifying tube circuit is set as the voltage output port of the power amplifying circuit

[0033] In some embodiments, the power amplifying circuit includes a plurality of amplifying tube circuits. The voltage output port of the previous amplifying tube circuit is connected to the voltage input port of the next amplifying tube circuit to form a multi-stage amplifying tube circuit. The base control port of at least one amplifying tube circuit in the multi-stage amplifying tube circuit is connected to the control circuit. The voltage input port of the first amplifying tube circuit in the multi-stage amplifying tube circuit is connected to the voltage establishing unit, and the voltage output port of the last amplifying tube circuit is set as the voltage output port of the power amplifying circuit.

[0034] In some embodiments, the control circuit is further configured to control the voltage of the base control port according to a gate structure voltage control instruction, and control the voltage of the base control port to be a preset control voltage after the voltage of the voltage output port reaches the target voltage of the gate structure.

[0035] In some embodiments, the preset control voltage is the control voltage of the base port for maintaining the target voltage of the gate structure.

[0036] In some embodiments, the gate structure voltage control circuit further includes: a cathode parameter sampling circuit, connected to the control circuit, for sampling the operating parameters of the cathode in the X-ray tube;

[0037] The control circuit adjusts the voltage of the base control port according to the operating parameters to control the target voltage of the gate structure to change following the operating parameters of the cathode in the X-ray tube.

[0038] In some embodiments, the cathode parameter sampling circuit includes a cathode voltage sampling circuit and / or a tube current sampling circuit.

[0039] In some embodiments, the gate structure voltage control circuit further includes:

[0040] A current limiting circuit, disposed between the voltage output port and the gate structure in the X-ray tube, for performing current limiting processing on the current output from the voltage output port.

[0041] In some embodiments, the control circuit is a digital controller; a digital-to-analog conversion circuit is provided between the control circuit and the power amplifier circuit, and the digital-to-analog conversion circuit is configured to convert the digital control signal output by the control circuit into an analog control signal and output it to the base control port.

[0042] In some embodiments, the control circuit is further configured to adjust the output voltage of the voltage establishing unit to control the input voltage of the power amplifier circuit.

[0043] In some embodiments, the gate structure voltage control circuit is integrated in the X-ray tube.

[0044] The third aspect of the embodiments of the present application further provides a multi-voltage output method, including:

[0045] Setting the power amplifier circuit to operate in the linear region; wherein, the power amplifier circuit includes a base control port, a voltage input port, and a voltage output port;

[0046] Output a voltage control signal to the base control port to control the voltage output port of the power amplifier circuit to output a target voltage; wherein, the target voltage is any voltage within a preset output range; the preset output range is determined by a voltage establishing unit connected to the voltage input port.

[0047] In some embodiments, it further includes:

[0048] After the voltage at the voltage output port reaches the target voltage, control the voltage at the base control port of the power amplifier circuit to be a preset control voltage.

[0049] The fourth aspect of the embodiments of the present application further provides a method for controlling the voltage of a grid structure, which is used to control the voltage of the grid structure in an X-ray tube. The method for controlling the voltage of the grid structure includes:

[0050] Set the power amplifier circuit to operate in the linear region; the power amplifier circuit includes a base control port, a voltage input port, and a voltage output port;

[0051] Output a grid structure voltage control signal to the base control port according to a grid structure voltage control instruction, so that the voltage output port of the power amplifier circuit outputs a grid structure target voltage; wherein, the grid structure target voltage is any voltage within the preset output range; the preset output range is determined by the voltage establishing unit connected to the voltage input port.

[0052] In some embodiments, it further includes:

[0053] Sample the operating parameters of the cathode in the X-ray tube;

[0054] Adjust the voltage of the base control port according to the operating parameters to control the grid structure target voltage to change following the operating parameters of the cathode in the X-ray tube.

[0055] In some embodiments, the method for controlling the voltage of the grid structure further includes:

[0056] Control the voltage of the base control port according to the operating parameters of the cathode in the X-ray tube to adjust the voltage of the voltage output port.

[0057] The fifth aspect of the embodiments of the present application further provides an X-ray device, which includes an X-ray tube and a grid structure voltage control circuit as described in any one of the above embodiments. Wherein, the X-ray tube includes a grid structure, a cathode, and an anode, and the grid structure voltage control circuit is connected to the grid structure in the X-ray tube.

[0058] In some embodiments, the X-ray device further includes:

[0059] A high-voltage generator for providing power to the gate structure voltage control circuit.

[0060] In some embodiments, optical fibers are used to establish communication between the high-voltage generator and the control circuit.

[0061] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows: The voltage establishment unit provides an input voltage to the power amplification circuit according to the preset output range of the multi-voltage output circuit. By setting the power amplification circuit to operate in the linear region, the control circuit outputs a voltage control signal to the base control port of the power amplification circuit to control the voltage output port of the power amplification circuit to output any voltage within the preset output range as the target voltage, so as to output continuous multiple voltages based on the same hardware structure, solving the problem that the current voltage control structure can only switch between a limited number of levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0063] Figure 1 Schematic diagram of a multi-voltage output circuit provided by an embodiment of the present application;

[0064] Figure 2 Schematic diagram of a multi-voltage output circuit provided by an embodiment of the present application;

[0065] Figure 3 Schematic diagram of a multi-voltage output circuit provided by an embodiment of the present application;

[0066] Figure 4 Schematic diagram of a multi-voltage output circuit provided by an embodiment of the present application;

[0067] Figure 5 Schematic diagram of a multi-voltage output circuit provided by an embodiment of the present application;

[0068] Figure 6 Schematic diagram of a multi-voltage output circuit provided by an embodiment of the present application;

[0069] Figure 7 Schematic diagram of a gate structure voltage control circuit provided by an embodiment of the present application;

[0070] Figure 8It is a schematic diagram of a gate structure voltage control circuit provided by an embodiment of the present application;

[0071] Figure 9 It is a schematic diagram of a gate structure voltage control circuit provided by an embodiment of the present application;

[0072] Figure 10 It is a schematic diagram of a gate structure voltage control circuit provided by an embodiment of the present application;

[0073] Figure 11 It is a schematic diagram of a gate structure voltage control circuit provided by an embodiment of the present application;

[0074] Figure 12 It is a schematic diagram of a gate structure voltage control circuit provided by an embodiment of the present application;

[0075] Figure 13 It is a schematic diagram of a gate structure voltage control circuit provided by an embodiment of the present application;

[0076] Figure 14 It is a schematic diagram of a gate structure voltage control circuit provided by an embodiment of the present application;

[0077] Figure 15 It is a schematic diagram of a gate structure voltage control circuit provided by an embodiment of the present application;

[0078] Figure 16 It is a schematic diagram of an X-ray device provided by an embodiment of the present application. Detailed implementation manners

[0079] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0080] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0081] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0082] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0083] The gate voltage control unit (hereinafter simply referred to as the gate control unit) is placed in the high-voltage generator. After generating the gate voltage, the gate control unit applies the gate structure voltage between the gate and the cathode of the X-ray device through a high-voltage cable. Imaging devices often require the gate structure voltage to be quickly switched between two or more levels. The fastest switching needs to be completed within several microseconds or even several hundred nanoseconds. However, after receiving the voltage switching instruction, the high-voltage generator needs to transmit the applied voltage to the gate inside the tube through the high-voltage cable. The voltage is affected by the parasitic capacitance on the high-voltage cable during the transmission process, resulting in energy dissipation during the voltage transmission and an increase in the voltage switching time. In order to transmit sufficient energy, it is necessary to increase the energy of the voltage generated by the high-voltage generator and increase the volume of the gate control unit, which increases the design difficulty of the high-voltage generator and affects the feasibility.

[0084] Secondly, the existing gate structure voltage control structures and methods can only ensure the switching of the gate structure voltage between two or a limited number of levels, and cannot achieve the quick switching of any level within the gate voltage control range, which will limit the gate control function.

[0085] To solve the above technical problems, the embodiments of the present application provide a multi-voltage output circuit. See Figure 1As shown, the multi-voltage output circuit in this embodiment includes a power amplifier circuit 200, a voltage establishment unit 300, and a control circuit 100. Among them, the power amplifier circuit 200 operates in the linear region. The power amplifier circuit 200 includes a base control port, a voltage input port, and a voltage output port. The voltage magnitude of the voltage establishment unit 300 is determined according to the preset output range of the multi-voltage output circuit. The voltage establishment unit 300 is connected to the voltage input port, and the control circuit 100 is connected to the base control port. The voltage establishment unit 300 can provide an input voltage for the power amplifier circuit 200, and the control circuit 100 can control the voltage output port of the power amplifier circuit 200 to output a target voltage according to the voltage control signal. The target voltage is any voltage within the preset output range.

[0086] In this embodiment, the power amplifier circuit 200 includes at least one semiconductor device. This semiconductor device can be a triode, a MOS transistor, or a base-controllable semiconductor device such as an IGBT. By setting the semiconductor device to operate in the saturation region, the power amplifier circuit 200 can be made to operate in the linear region. At this time, when the voltage at the base control port of the power amplifier circuit 200 remains unchanged, the voltage at the voltage output port of the power amplifier circuit 200 changes linearly and continuously. The voltage establishment unit 300 can determine the preset output range of the voltage that the multi-voltage output circuit can output. By controlling the voltage at the base control port of the power amplifier circuit 200, the voltage output port of the power amplifier circuit 200 can be controlled to output any voltage within the preset output range, realizing continuous adjustment of the output voltage of the multi-voltage output circuit. It is not necessary to set multiple switching switches for combination to achieve any level switching within the preset output range, greatly expanding the application scenarios of the multi-voltage output circuit.

[0087] In some embodiments, as shown in Figure 2 the power amplifier circuit 200 includes a first amplifier tube circuit 210 and a second amplifier tube circuit 220. The voltage input port includes a first voltage input port and a second voltage input port. The voltage establishment unit 300 includes a first voltage establishment unit 310 and a second voltage establishment unit 320.

[0088] In this embodiment, the base control port of the first amplifier tube circuit 210 is connected to the control circuit 100 together with the base control port of the second amplifier tube circuit 220. The first voltage input port of the first amplifier tube circuit 210 is connected to the first voltage establishment unit 310, and the second voltage input port of the second amplifier tube circuit 220 is connected to the second voltage establishment unit 320. The first voltage output port of the first amplifier tube circuit 210 and the second voltage output port of the second amplifier tube circuit 220 are connected to the voltage output port.

[0089] In this embodiment, the first amplifying transistor circuit 210 and the second amplifying transistor circuit 220 can form a class-B power amplifier. The first amplifying transistor circuit can serve as the upper arm of the class-B power amplifier, and the second amplifying transistor circuit can serve as the lower arm of the class-B power amplifier. The first amplifying transistor circuit 210 and the second amplifying transistor circuit 220 can be formed by a triode, a MOS transistor, or an IGBT device, or formed by a combination of a triode, a MOS transistor, or an IGBT device and a resistor.

[0090] In some embodiments, the first voltage establishing unit 310 is configured to provide a positive voltage, and the second voltage establishing unit 320 is configured to provide a negative voltage.

[0091] In some embodiments, the first voltage establishing unit 310 and the second voltage establishing unit 320 have two polarities. For example, the first voltage establishing unit 310 and the second voltage establishing unit 320 are both of positive polarity. At this time, the first voltage establishing unit 310 can provide a positive voltage for the first voltage input port, and the second establishing unit can provide a positive voltage for the second voltage input port. Or the first voltage establishing unit 310 and the second voltage establishing unit 320 are both of negative polarity. At this time, the first voltage establishing unit 310 can provide a negative voltage for the first voltage input port, and the second establishing unit can provide a negative voltage for the second voltage input port.

[0092] In some embodiments, the first voltage establishing unit 310 can be set to a positive voltage, and the second voltage establishing unit 320 can be grounded.

[0093] In some embodiments, the control circuit 100 can also provide a voltage bias signal for the base control port of the first amplifying transistor circuit 210 and the base control terminal of the second amplifying transistor circuit 220, so as to form a class-AB power amplifier circuit.

[0094] In some embodiments, referring to Figure 3 as shown, the power amplifier circuit 200 further includes a voltage bias circuit 400; the base control port of the first amplifying transistor circuit 210 and the base control port of the second amplifying transistor circuit 220 are connected to the control circuit 100 through the voltage bias circuit 400.

[0095] In this embodiment, by providing a voltage bias circuit 400 between the base control port of the first amplifier tube circuit 210 and the control circuit 100, and between the base control port of the second amplifier tube circuit 220 and the control circuit 100, the voltage bias circuit 400 can provide bias current for the base control port of the first amplifier tube circuit 210 and the base control port of the second amplifier tube circuit 220, and a class-AB power amplifier can be formed. The first amplifier tube circuit can serve as the upper bridge arm of the class-AB power amplifier, and the second amplifier tube circuit can serve as the lower bridge arm of the class-AB power amplifier. The first amplifier tube circuit 210 and the second amplifier tube circuit 220 can be formed by a triode, a MOS tube, or an IGBT device, or formed by a combination of a triode, a MOS tube, or an IGBT device and a resistor.

[0096] In some embodiments, referring to Figure 4 as shown, the first amplifier tube circuit 210 may include a first triode Q1 and a first resistor R1. The first end of the first resistor R1 is connected to the first voltage establishment unit 310, the second end of the first resistor R1 is connected to the collector of the first triode Q1, the base of the first triode Q1 is connected to the voltage bias circuit 400, the emitter of the first triode Q1 and the collector of the second triode Q2 are commonly connected as the voltage output port of the power amplifier circuit 200. The emitter of the second triode Q2 is connected to the first end of the second resistor, the second end of the second resistor is connected to the second voltage establishment unit 320, and the base of the second triode Q2 is connected to the voltage bias circuit 400.

[0097] In some embodiments, Figure 4 the base of the first triode Q1 in can be directly connected to the control circuit 100, and the base of the second triode Q2 can be directly connected to the control circuit 100 to form a class-B power amplifier.

[0098] In some embodiments, the power amplifier circuit 200 includes an amplifier tube circuit; the base control port of the amplifier tube circuit is connected to the control circuit 100; the voltage input port of the amplifier tube circuit is connected to the voltage establishment unit 300; the voltage output port of the amplifier tube circuit is set as the voltage output port of the power amplifier circuit 200.

[0099] In this embodiment, the power amplifier circuit 200 may include only one amplifier tube circuit to form a class-A power amplifier. The amplifier tube circuit can be formed by a triode, a MOS tube, or an IGBT device, or formed by a combination of a triode, a MOS tube, or an IGBT device and a resistor.

[0100] In some embodiments, the circuit structure of the amplifier tube circuit can be the same as that of the first amplifier tube circuit 210, or the same as that of the second amplifier tube circuit 220.

[0101] In some embodiments, the power amplification circuit 200 includes a plurality of amplifier transistor circuits. The amplifier transistor circuits are connected to each other through the voltage output port of one amplifier transistor circuit to the base control port of another amplifier transistor circuit to form a multi-stage amplifier transistor circuit. The base control port of the first amplifier transistor circuit in the multi-stage amplifier transistor circuit is used to connect to the control circuit 100, and the voltage output port of the last amplifier transistor circuit is set as the voltage output port of the power amplification circuit 200.

[0102] In this embodiment, by arranging a plurality of amplifier transistor circuits to be connected in series, a multi-stage amplifier transistor circuit for current amplification can be formed. The base control port of the first amplifier transistor circuit is used to connect to the control circuit 100 and receive the voltage control signal provided by the control circuit 100. This voltage control signal can determine the voltage magnitude of the target voltage output from the voltage output port of the power amplification circuit 200. The number of amplifier transistor circuits in the multi-stage amplifier transistor circuit can determine the maximum current magnitude that the power amplification circuit 200 can withstand.

[0103] In some embodiments, as shown in Figure 5 the third resistor R3 and the third triode Q3 form the first amplifier transistor circuit, the fourth resistor R4 and the fourth triode Q4 form the last amplifier transistor circuit. The number of amplifier transistor circuits between the first amplifier transistor circuit and the last amplifier transistor circuit is not limited. A plurality of amplifier transistor circuits are connected in series to form a multi-stage amplifier transistor circuit for current amplification.

[0104] In some embodiments, the power amplification circuit 200 includes a plurality of amplifier transistor circuits. The voltage output port of the previous amplifier transistor circuit is connected to the voltage input port of the subsequent amplifier transistor circuit to form a multi-stage amplifier transistor circuit. The base control port of at least one amplifier transistor circuit in the multi-stage amplifier transistor circuit is connected to the control circuit 100. The voltage input port of the first amplifier transistor circuit in the multi-stage amplifier transistor circuit is connected to the voltage establishing unit 300, and the voltage output port of the last amplifier transistor circuit is set as the voltage output port of the power amplification circuit 200.

[0105] In this embodiment, by arranging a plurality of amplifier transistor circuits to be connected in series, a multi-stage amplifier transistor circuit for voltage amplification can be formed. One or more of the base control ports of the plurality of amplifier transistor circuits can be selected to be connected to the control circuit 100, that is, the base control port of at least one amplifier transistor circuit receives the voltage control signal provided by the control circuit 100, so as to control the multi-stage amplifier transistor circuit to operate in the saturation region. This voltage control signal can determine the voltage magnitude of the target voltage output from the voltage output port of the power amplification circuit 200. The number of amplifier transistor circuits in the multi-stage amplifier transistor circuit can determine the maximum voltage magnitude that the power amplification circuit 200 can withstand.

[0106] In some embodiments, referring to Figure 6 As shown, the fifth resistor R5 and the fifth triode Q5 form the first amplifier circuit, and the sixth triode Q6 forms the last amplifier circuit. The number of amplifier circuits between the first amplifier circuit and the last amplifier circuit is not limited. Multiple amplifier circuits connected in series can form a multi-stage amplifier circuit for voltage amplification.

[0107] In some embodiments, the base control port of one of the amplifier circuits in the multi-stage amplifier circuit is connected to the control circuit 100. The voltage input port of the first amplifier circuit in the multi-stage amplifier circuit is connected to the voltage establishing unit 300. The voltage output port of the last amplifier circuit is set as the voltage output port of the power amplifier circuit 200. The voltage of the base control ports of other amplifier circuits can follow the voltage of the base control port of the amplifier circuit connected to the control circuit 100 through a following circuit, realizing the following control of multiple amplifier circuits in the multi-stage amplifier circuit.

[0108] In some embodiments, the circuit structure of the amplifier circuit in the multi-stage amplifier circuit can be the same as that of the first amplifier circuit 210 in the above embodiments, or can be the same as that of the second amplifier circuit 220 in the above embodiments.

[0109] The embodiment of the present application also provides a grid structure voltage control circuit, which is used to control the voltage of the grid structure 510 in the X-ray tube. Referring to Figure 7 As shown, the grid structure voltage control circuit includes: a power amplifier circuit 200, a voltage establishing unit 300, and a control circuit 100. The power amplifier circuit 200 operates in the linear region; the power amplifier circuit 200 includes at least one bridge arm, and the bridge arm includes a base control port, a voltage input port, and a voltage output port; the magnitude of the voltage of the voltage establishing unit 300 is determined according to the voltage requirement range of the grid structure 510 in the X-ray tube, and the voltage establishing unit 300 is connected to the voltage input port; the voltage establishing unit 300 is used to provide an input voltage for the power amplifier circuit 200; the control circuit 100 is connected to the base control port; the control circuit 100 is used to control the voltage output port to output the grid structure target voltage after receiving the output voltage control signal; the grid structure target voltage is any voltage within the preset output range; wherein, the voltage output port is connected to the grid structure 510 in the X-ray tube to provide the grid structure voltage for the grid structure 510 in the X-ray tube.

[0110] In this embodiment, the voltage output port of the gate structure voltage control circuit is connected to the gate structure 510 inside the X-ray tube. The power amplification circuit 200 includes at least one semiconductor device, which can be formed by a triode, a MOS transistor, or an IGBT device. By setting the semiconductor device to operate in the saturation region, the power amplification circuit 200 can be made to operate in the linear region. At this time, when the voltage at the base control port of the power amplification circuit 200 remains unchanged, the voltage at the voltage output port of the power amplification circuit 200 changes linearly and continuously. The voltage establishment unit 300 can determine the preset output range of the voltage that the multi-voltage output circuit can output. By controlling the voltage at the base control port of the power amplification circuit 200, any voltage within the preset output range can be output from the voltage output port of the power amplification circuit 200, realizing continuous adjustment of the output voltage of the multi-voltage output circuit. It is not necessary to set multiple switching switches for combination to achieve any level switching within the preset output range, greatly expanding the application scenarios of the multi-voltage output circuit.

[0111] In some embodiments, as shown in Figure 8 FIG. 5, the power amplification circuit 200 includes a first amplifier circuit 210 and a second amplifier circuit 220; the voltage input port includes a first voltage input port and a second voltage input port; the voltage establishment unit 300 includes a first voltage establishment unit 310 and a second voltage establishment unit 320. The base control port of the first amplifier circuit 210 is connected to the control circuit 100 with the base control port of the second amplifier circuit 220; the first voltage input port of the first amplifier circuit 210 is connected to the first voltage establishment unit 310, and the second voltage input port of the second amplifier circuit 220 is connected to the second voltage establishment unit 320; the first voltage output port of the first amplifier circuit 210 and the second voltage output port of the second amplifier circuit 220 are connected to the voltage output port.

[0112] In some embodiments, the first amplifier circuit 210 and the second amplifier circuit 220 can form a class B power amplifier. The first amplifier circuit 210 can serve as the upper bridge arm of the class AB power amplifier, and the second amplifier circuit 220 can serve as the lower bridge arm of the class AB power amplifier. The first amplifier circuit 210 and the second amplifier circuit 220 can be the first amplifier circuit.

[0113] In some embodiments, the first voltage establishment unit 310 is set to provide a positive voltage, and the second voltage establishment unit 320 is set to provide a negative voltage.

[0114] In some embodiments, the first voltage establishing unit 310 and the second voltage establishing unit 320 have two polarities. For example, when the first voltage establishing unit 310 and the second voltage establishing unit 320 are both of positive polarity, the first voltage establishing unit 310 can provide a positive voltage for the first voltage input port, and the second establishing unit can provide a positive voltage for the second voltage input port. Or when the first voltage establishing unit 310 and the second voltage establishing unit 320 are both of negative polarity, the first voltage establishing unit 310 can provide a negative voltage for the first voltage input port, and the second establishing unit can provide a negative voltage for the second voltage input port.

[0115] In some embodiments, the first voltage establishing unit 310 can be set to a positive voltage, and the second voltage establishing unit 320 can be grounded.

[0116] In some embodiments, referring to Figure 9 As shown, the power amplifier circuit 200 further includes a voltage biasing circuit 400; the base control port of the first amplifier transistor circuit 210 and the base control port of the second amplifier transistor circuit 220 are connected to the control circuit 100 through the voltage biasing circuit 400.

[0117] In this embodiment, by providing the voltage biasing circuit 400 between the base control port of the first amplifier transistor circuit 210 and the control circuit 100, and between the base control port of the second amplifier transistor circuit 220 and the control circuit 100, the voltage biasing circuit 400 can provide a bias current for the base control port of the first amplifier transistor circuit 210 and the base control port of the second amplifier transistor circuit 220, and an AB - class power amplifier can be formed. The first amplifier transistor circuit can serve as the upper bridge arm of the AB - class power amplifier, and the second amplifier transistor circuit can serve as the lower bridge arm of the AB - class power amplifier. The first amplifier transistor circuit 210 and the second amplifier transistor circuit 220 can be formed by a triode, a MOS transistor, or an IGBT device, or formed by a combination of a triode, a MOS transistor, or an IGBT device and a resistor.

[0118] In some embodiments, referring to Figure 10 As shown, the first amplifier transistor circuit 210 can include a first triode Q1 and a first resistor R1. The first end of the first resistor R1 is connected to the first voltage establishing unit 310, the second end of the first resistor R1 is connected to the collector of the first triode Q1, the base of the first triode Q1 is connected to the voltage biasing circuit 400, the emitter of the first triode Q1 and the collector of the second triode Q2 are commonly connected as the voltage output port of the power amplifier circuit 200, the emitter of the second triode Q2 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is connected to the second voltage establishing unit 320, and the base of the second triode Q2 is connected to the voltage biasing circuit 400.

[0119] In some embodiments,Figure 10 The base of the first triode Q1 in

[0120] In some embodiments, the power amplifier circuit 200 includes an amplifying transistor circuit; the base control port of the amplifying transistor circuit is connected to the control circuit 100; the voltage input port of the amplifying transistor circuit is connected to the voltage establishing unit 300; and the voltage output port of the amplifying transistor circuit is set as the voltage output port of the power amplifier circuit 200.

[0121] In this embodiment, the power amplifier circuit 200 may only include one amplifying transistor circuit to form a class-A power amplifier. The amplifying transistor circuit may be formed by a triode, a MOS transistor, or an IGBT device, or may be formed by a combination of a triode, a MOS transistor, or an IGBT device and a resistor.

[0122] In some embodiments, the circuit structure of the amplifying transistor circuit may be the same as that of the first amplifying transistor circuit 210 or the same as that of the second amplifying transistor circuit 220.

[0123] In some embodiments, referring to Figure 11 As shown, the power amplifier circuit 200 includes a plurality of amplifying transistor circuits. The amplifying transistor circuits are connected to each other through the voltage output port of one amplifying transistor circuit connected to the base control port of another amplifying transistor circuit to form a multi-stage amplifying transistor circuit. The base control port of the first amplifying transistor circuit in the multi-stage amplifying transistor circuit is used to connect to the control circuit 100, and the voltage output port of the last amplifying transistor circuit is set as the voltage output port of the power amplifier circuit 200.

[0124] In this embodiment, by setting a plurality of amplifying transistor circuits to be connected in series, a multi-stage amplifying transistor circuit for current amplification can be formed. The base control port of the first amplifying transistor circuit is used to connect to the control circuit 100 to receive the voltage control signal provided by the control circuit 100. This voltage control signal can determine the voltage magnitude of the target voltage output from the voltage output port of the power amplifier circuit 200. The number of amplifying transistor circuits in the multi-stage amplifying transistor circuit can determine the maximum current that the power amplifier circuit 200 can withstand.

[0125] In some embodiments, referring to Figure 12As shown, the power amplifier circuit 200 includes a plurality of amplifier transistor circuits. The voltage output port of the previous amplifier transistor circuit is connected to the voltage input port of the next amplifier transistor circuit to form a multi-stage amplifier transistor circuit. The base control port of at least one amplifier transistor circuit in the multi-stage amplifier transistor circuit is connected to the control circuit 100. The voltage input port of the first amplifier transistor circuit in the multi-stage amplifier transistor circuit is connected to the voltage establishing unit 300. The voltage output port of the last amplifier transistor circuit is set as the voltage output port of the power amplifier circuit 200.

[0126] In this embodiment, by setting a plurality of amplifier transistor circuits connected in series, a multi-stage amplifier transistor circuit for voltage amplification can be formed. One or more of the base control ports of the plurality of amplifier transistor circuits can be selected to be connected to the control circuit 100, that is, the base control port of at least one amplifier transistor circuit receives the voltage control signal provided by the control circuit 100, so as to control the multi-stage amplifier transistor circuit to operate in the saturation region. This voltage control signal can determine the voltage magnitude of the target voltage output from the voltage output port of the power amplifier circuit 200. The number of amplifier transistor circuits in the multi-stage amplifier transistor circuit can determine the maximum voltage that the power amplifier circuit 200 can withstand.

[0127] In some embodiments, the base control port of one of the amplifier transistor circuits in the multi-stage amplifier transistor circuit is connected to the control circuit 100. The voltage input port of the first amplifier transistor circuit in the multi-stage amplifier transistor circuit is connected to the voltage establishing unit 300. The voltage output port of the last amplifier transistor circuit is set as the voltage output port of the power amplifier circuit 200. The voltages of the base control ports of the other amplifier transistor circuits can follow the voltage of the base control port of the amplifier transistor circuit connected to the control circuit 100 through a following circuit, realizing the following control of the plurality of amplifier transistor circuits in the multi-stage amplifier transistor circuit.

[0128] In some embodiments, the circuit structure of the amplifier transistor circuit in the multi-stage amplifier transistor circuit can be the same as the circuit structure of the first amplifier transistor circuit 210 in the above embodiment, or can be the same as the circuit structure of the second amplifier transistor circuit 220 in the above embodiment.

[0129] In some embodiments, the control circuit 100 is further configured to control the voltage of the base control port according to the gate structure voltage control instruction, and control the voltage of the base control port to be a preset control voltage after the voltage at the voltage output port reaches the gate structure target voltage.

[0130] In this embodiment, when the target voltage of the gate structure is a fixed value, after the voltage at the voltage output port reaches the target voltage of the gate structure, the voltage at the base control port is controlled to be a preset control voltage; when the target voltage of the gate structure is a continuously varying value, the voltage at the base control port can be controlled so that the output voltage of the power amplifier tube circuit follows the continuously varying target voltage of the gate structure.

[0131] In some embodiments, the preset control voltage is the control voltage of the base terminal for maintaining the target voltage of the gate structure.

[0132] In this embodiment, there may be some parasitic capacitances of components in the gate structure 510 connected to the voltage output port of the power amplifier circuit 200, thus forming a leakage current at the voltage output port of the power amplifier circuit 200. In order to maintain the voltage at the voltage output port at the target voltage of the gate structure, the control voltage applied to the base control port of the power amplifier circuit 200 can be determined according to the circuit structure or component parameters and operating states connected to the voltage output port of the power amplifier circuit 200, so that the charging current at the voltage output port of the power amplifier circuit 200 cancels out its leakage current, maintaining the voltage stability at the voltage output port of the power amplifier circuit 200.

[0133] In some embodiments, as shown in Figure 13 the gate structure voltage control circuit further includes a cathode parameter sampling circuit 610. The cathode parameter sampling circuit 610 is connected to the control circuit 100, and the cathode parameter sampling circuit 610 samples the operating parameters of the cathode in the X-ray tube. The control circuit 100 adjusts the voltage at the base control port according to the operating parameters to control the target voltage of the gate structure to vary with the operating parameters of the cathode in the X-ray tube.

[0134] In the X-ray tube, the cathode can be used as a reference ground. The operating parameters of the cathode in the X-ray tube can be sampled through the cathode parameter sampling circuit 610, so as to obtain the operating parameters of the cathode in the X-ray tube during the rising and falling stages of the high-voltage generator 710, and based on these operating parameters, the target voltage of the gate structure is adjusted so that the target voltage of the gate structure varies with the operating parameters of the cathode in the X-ray tube, thereby using the radiation dose during the rising and falling stages of the high-voltage generator 710 for CT sampling and avoiding the patient from absorbing ineffective doses.

[0135] In some embodiments, the cathode parameter sampling circuit 610 includes a cathode voltage sampling circuit.

[0136] In this embodiment, the cathode voltage sampling circuit can sample the voltage of the cathode in the X-ray tube, and the control circuit 100 adjusts the voltage of the base control port according to the voltage of the cathode in the X-ray tube, so as to control the target voltage of the gate structure to change following the operating parameters of the cathode in the X-ray tube.

[0137] In some embodiments, the cathode parameter sampling circuit 610 includes a tube current sampling circuit.

[0138] In this embodiment, the tube current sampling circuit can sample the current flowing through the cathode in the X-ray tube, and the control circuit 100 adjusts the voltage of the base control port according to the current flowing through the cathode in the X-ray tube, so as to control the target voltage of the gate structure to change following the operating parameters of the cathode in the X-ray tube.

[0139] In some embodiments, referring to Figure 14 As shown, the gate structure voltage control circuit further includes a current limiting circuit 620. The current limiting circuit 620 is disposed between the voltage output port and the gate structure 510 in the X-ray tube, and the current limiting circuit 620 is used to perform current limiting processing on the current output from the voltage output port.

[0140] In some embodiments, the current limiting circuit 620 can be composed of one or more current limiting resistors, and the multiple current limiting resistors can be arranged in series or in parallel.

[0141] In some embodiments, the control circuit 100 can be an analog controller, and the analog controller can provide a control voltage for the base control port of the power amplifier circuit 200 to control the working state of the power amplifier circuit 200.

[0142] In some embodiments, referring to Figure 15 As shown, the control circuit 100 is a digital controller; a digital-to-analog conversion circuit 630 is provided between the control circuit 100 and the power amplifier circuit 200, and the digital-to-analog conversion circuit 630 is used to convert the digital control signal output by the control circuit 100 into an analog control signal and output it to the base control port.

[0143] In some embodiments, the control circuit 100 is further used to adjust the output voltage of the voltage establishing unit 300 to control the input voltage of the power amplifier circuit 200.

[0144] In some embodiments, the gate structure voltage control circuit is integrated in the X-ray tube.

[0145] In this embodiment, by integrating the gate structure voltage control circuit in the X-ray tube, it is possible to avoid problems such as voltage delay or excessive output voltage difference caused by the parasitic capacitance of the high-voltage cable when the gate structure voltage control circuit transmits voltage to the gate structure 510 in the X-ray tube.

[0146] The embodiment of the present application further provides a multi-voltage output method, including: setting the power amplifier circuit 200 to operate in the linear region, and outputting a voltage control signal to the base control port to control the voltage output port of the power amplifier circuit 200 to output a target voltage. In this embodiment, the power amplifier circuit 200 includes a base control port, a voltage input port, and a voltage output port, and the target voltage is any voltage within a preset output range; the preset output range is determined by a voltage establishing unit 300 connected to the voltage input port.

[0147] In some embodiments, the multi-voltage output method further includes, after the voltage at the voltage output port reaches the target voltage, controlling the voltage at the base control port of the power amplifier circuit 200 to be a preset control voltage.

[0148] In this embodiment, there may be some component parasitic capacitances in the gate structure 510 connected to the voltage output port of the power amplifier circuit 200, thereby forming a leakage current at the voltage output port of the power amplifier circuit 200. In order to maintain the voltage at the voltage output port at the gate structure target voltage, the control voltage applied to the base control port of the power amplifier circuit 200 can be determined according to the circuit structure or component parameters and operating state connected to the voltage output port of the power amplifier circuit 200, so that the charging current at the voltage output port of the power amplifier circuit 200 cancels out its leakage current, maintaining the voltage stability at the voltage output port of the power amplifier circuit 200.

[0149] The embodiment of the present application further provides a gate structure voltage control method, which is used to control the voltage of the gate structure 510 in the X-ray tube. The gate structure voltage control method includes: setting the power amplifier circuit 200 to operate in the linear region; outputting a gate structure voltage control signal to the base control port according to the gate structure voltage control instruction, so that the voltage output port of the power amplifier circuit 200 outputs the gate structure target voltage.

[0150] In this embodiment, the power amplification circuit 200 includes a base control port, a voltage input port, and a voltage output port. The target voltage of the gate structure is any voltage within a preset output range, and the preset output range can be determined by a voltage establishment unit 300 connected to the voltage input port. The voltage output port of the gate structure voltage control circuit is connected to the gate structure 510 in the X-ray tube. The power amplification circuit 200 includes at least one semiconductor device, which can be a triode, a MOS transistor, or an IGBT device. By setting the semiconductor device to operate in the saturation region, the power amplification circuit 200 can be made to operate in the linear region. At this time, when the voltage at the base control port of the power amplification circuit 200 remains unchanged, the voltage at the voltage output port of the power amplification circuit 200 changes linearly and continuously. The voltage establishment unit 300 can determine the preset output range of the voltage that the multi-voltage output circuit can output. By controlling the voltage at the base control port of the power amplification circuit 200, any voltage within the preset output range can be output from the voltage output port of the power amplification circuit 200, realizing continuous adjustment of the output voltage of the multi-voltage output circuit. Without setting multiple switching switches for combination, any level switching within the preset output range can be achieved, greatly expanding the application scenarios of the multi-voltage output circuit.

[0151] In some embodiments, the gate structure voltage control method further includes: sampling the operating parameters of the cathode in the X-ray tube; adjusting the voltage at the base control port according to the operating parameters to control the target voltage of the gate structure to change following the operating parameters of the cathode in the X-ray tube.

[0152] In the X-ray tube, the cathode can be used as a reference ground. The operating parameters of the cathode in the X-ray tube can be sampled by a cathode parameter sampling circuit 610, so as to obtain the operating parameters of the cathode in the X-ray tube during the rising and falling stages of the high-voltage generator 710, and adjust the target voltage of the gate structure based on the operating parameters, so that the target voltage of the gate structure changes following the operating parameters of the cathode in the X-ray tube, thereby using the radiation dose during the rising and falling stages of the high-voltage generator 710 for CT sampling and avoiding the patient from absorbing ineffective dose.

[0153] In some embodiments, the operating parameters of the cathode in the X-ray tube can include the voltage of the cathode in the X-ray tube, or can also include the current of the cathode in the X-ray tube.

[0154] For example, by sampling the voltage of the cathode in the X-ray tube in real time to obtain a cathode voltage sampling signal, adjusting the gate structure voltage control signal according to the cathode voltage sampling signal, and then adjusting the voltage at the base control port according to the gate structure voltage control signal to control the target voltage of the gate structure to follow the voltage of the cathode in the X-ray tube.

[0155] In this embodiment, the voltage of the cathode in the X-ray tube can be sampled to obtain a cathode voltage sampling signal, and the control circuit 100 adjusts the voltage of the base control port according to the voltage of the cathode in the X-ray tube, so as to control the target voltage of the gate structure to change following the voltage of the cathode in the X-ray tube.

[0156] In some embodiments, the current flowing through the cathode in the X-ray tube can be sampled, and the voltage of the base control port is adjusted according to the current flowing through the cathode in the X-ray tube, so as to control the target voltage of the gate structure to change following the current of the cathode in the X-ray tube.

[0157] In some embodiments, the gate structure voltage control method further includes: controlling the voltage of the base control port according to the cathode operating parameters in the X-ray tube, so as to adjust the voltage of the voltage output port.

[0158] In this embodiment, the cathode operating parameters in the X-ray tube can be sampled or predicted according to the operating model of the X-ray tube. By predicting the cathode operating parameters in the X-ray tube and controlling the voltage of the base control port in advance, the voltage on the gate structure 510 connected to the voltage output port can reach the target voltage of the gate structure in a shorter time, reduce the delay in the voltage switching process, maximize the use of the radiation dose in the X-ray tube, and reduce the absorption dose of the patient during one imaging process.

[0159] The embodiment of the present application further provides an X-ray device, including an X-ray tube and the gate structure voltage control circuit according to any one of the above embodiments. Wherein, the X-ray tube includes a gate structure 510, a cathode and an anode, and the gate structure voltage control circuit is connected to the gate structure 510 in the X-ray tube.

[0160] In some embodiments, as shown in Figure 16 the X-ray device further includes a high-voltage generator 710, and the high-voltage generator 710 is used to provide power for the gate structure voltage control circuit.

[0161] In some embodiments, the high-voltage generator 710 can be used as a grid control power supply to provide power for the gate structure voltage control circuit, and the high-voltage generator 710 can communicate with the control circuit 100 by using an optical fiber.

[0162] In some embodiments, the high-voltage generator 710 can also directly communicate with and be controlled by the imaging device.

[0163] In some embodiments, the first voltage establishing unit 310 and the second voltage establishing unit 320 may be disposed outside the X-ray tube, and the first voltage and the second voltage are transmitted to the grid control power supply through a high-voltage cable, and are respectively output to the first amplifier tube circuit 210 and the second amplifier tube circuit 220.

[0164] In some embodiments, if the high-voltage cable between the high-voltage generator 710 and the X-ray tube is not long, and on the premise that the grid control voltage switching speed and the grid power supply output power meet the requirements of the imaging device, the entire grid control power supply and the control circuit 100 may also be disposed outside the X-ray tube.

[0165] In some specific application embodiments, the voltage establishing unit provides an input voltage for the power amplifier circuit according to the preset output range of the multi-voltage output circuit. By setting the power amplifier circuit to operate in the linear region, the control circuit outputs a voltage control signal to the base control port of the power amplifier circuit, and controls the voltage output port of the power amplifier circuit to output any voltage within the preset output range as the target voltage, so as to output continuous multiple voltages based on the same hardware structure, solving the problem that the current voltage control structure can only switch between a limited number of levels. On the other hand, the operating parameters of the cathode of the X-ray tube can also be used as a control instruction for tracking, and the focal spot can also be ensured to meet the imaging requirements during the change stage of the operating parameters of the cathode of the X-ray tube, improving the X-ray dose utilization rate and reducing the ineffective dose radiation received by the patient.

[0166] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A multi-voltage output circuit, characterized in that, comprising; a power amplifier circuit, the power amplifier circuit operating in the linear region; the power amplifier circuit includes a base control port, a voltage input port, and a voltage output port; a voltage establishing unit, the magnitude of the voltage of the voltage establishing unit being determined according to a preset output range of the multi-voltage output circuit, the voltage establishing unit being connected to the voltage input port; the voltage establishing unit is used to provide an input voltage for the power amplifier circuit; a control circuit, the control circuit being connected to the base control port; the control circuit is used to control the voltage output port of the power amplifier circuit to output a target voltage according to a voltage control signal; the target voltage is any voltage within the preset output range.

2. The multi-voltage output circuit according to claim 1, wherein the power amplifier circuit includes a first amplifier tube circuit and a second amplifier tube circuit; the voltage input port includes a first voltage input port and a second voltage input port; the voltage establishing unit includes a first voltage establishing unit and a second voltage establishing unit; the base control port of the first amplifier tube circuit and the base control port of the second amplifier tube circuit are connected to the control circuit; the first voltage input port of the first amplifier tube circuit is connected to the first voltage establishing unit, and the second voltage input port of the second amplifier tube circuit is connected to the second voltage establishing unit; the first voltage output port of the first amplifier tube circuit and the second voltage output port of the second amplifier tube circuit are connected to the voltage output port.

3. The multi-voltage output circuit according to claim 2, wherein the first voltage establishing unit is set to provide a positive voltage, and the second voltage establishing unit is set to provide a negative voltage.

4. The multi-voltage output circuit according to claim 2, wherein the control circuit is further used to provide a bias voltage signal for the base control port; or a voltage bias circuit is provided between the power amplifier circuit and the control circuit; the base control port of the first amplifier tube circuit and the base control port of the second amplifier tube circuit are connected to the control circuit through the voltage bias circuit.

5. The multi-voltage output circuit according to claim 1, wherein the power amplifier circuit includes an amplifier tube circuit; the base control port of the amplifier tube circuit is connected to the control circuit; the voltage input port of the amplifier tube circuit is connected to the voltage establishing unit; the voltage output port of the amplifier tube circuit is set as the voltage output port of the power amplifier circuit.

6. The multi-voltage output circuit according to claim 1, wherein the power amplifier circuit includes a plurality of amplifier tube circuits, and the amplifier tube circuits are connected to each other through the voltage output port of one amplifier tube circuit to the base control port of another amplifier tube circuit to form a multi-stage amplifier tube circuit. The base control port of the first amplifier tube circuit in the multi-stage amplifier tube circuit is used to be connected to the control circuit, and the voltage output port of the last amplifier tube circuit is set as the voltage output port of the power amplifier circuit.

7. The multi-voltage output circuit according to claim 1, wherein The power amplifier circuit includes multiple amplifier transistor circuits. The voltage output port of the previous amplifier transistor circuit is connected to the voltage input port of the subsequent amplifier transistor circuit to form a multi-stage amplifier transistor circuit. The base control port of at least one of the amplifier transistor circuits in the multi-stage amplifier transistor circuit is connected to the control circuit. The voltage input port of the first amplifier transistor circuit in the multi-stage amplifier transistor circuit is connected to the voltage establishing unit. The voltage output port of the last amplifier transistor circuit is set as the voltage output port of the power amplifier circuit.

8. A gate structure voltage control circuit for controlling the voltage of a gate structure within an X-ray tube, characterized in that, The gate structure voltage control circuit includes: A power amplifier circuit that operates in the linear region. The power amplifier circuit includes a base control port, a voltage input port, and a voltage output port. A voltage establishing unit, the magnitude of the voltage of which is determined according to the voltage requirement range of the gate structure in the X-ray tube. The voltage establishing unit is connected to the voltage input port. The voltage establishing unit is used to provide an input voltage for the power amplifier circuit. A control circuit that is connected to the base control port. The control circuit is used to control the voltage output port to output the target voltage of the gate structure after receiving the output voltage control signal. The target voltage of the gate structure is any voltage within the preset output range. Wherein, the voltage output port is connected to the gate structure in the X-ray tube and is used to provide the gate structure voltage for the gate structure in the X-ray tube.

9. The gate structure voltage control circuit according to claim 8, wherein, The power amplifier circuit includes a first amplifier transistor circuit and a second amplifier transistor circuit. The voltage input port includes a first voltage input port and a second voltage input port. The voltage establishing unit includes a first voltage establishing unit and a second voltage establishing unit. The base control port of the first amplifier transistor circuit and the base control port of the second amplifier transistor circuit are connected to the control circuit. The first voltage input port of the first amplifier transistor circuit is connected to the first voltage establishing unit. The second voltage input port of the second amplifier transistor circuit is connected to the second voltage establishing unit. The first voltage output port of the first amplifier transistor circuit and the second voltage output port of the second amplifier transistor circuit are connected to the voltage output port.

10. The gate structure voltage control circuit according to claim 9, characterized in that, The first voltage establishing unit is set to provide a positive voltage, and the second voltage establishing unit is set to provide a negative voltage.

11. The gate structure voltage control circuit according to claim 9, wherein The control circuit is further used to provide a bias voltage signal for the base control port; or A voltage bias circuit is provided between the power amplifier circuit and the control circuit; The base control port of the first amplifier transistor circuit and the base control port of the second amplifier transistor circuit are connected to the control circuit through the voltage bias circuit.

12. The gate structure voltage control circuit according to claim 8, wherein The power amplifier circuit includes an amplifier transistor circuit. The base control port of the amplifier transistor circuit is connected to the control circuit. The voltage input port of the amplifier transistor circuit is connected to the voltage establishing unit. The voltage output port of the amplifier transistor circuit is set as the voltage output port of the power amplifier circuit.

13. The gate structure voltage control circuit according to claim 8, characterized in that, The power amplifier circuit includes a plurality of amplifier tube circuits. The amplifier tube circuits are connected to the base control port of another amplifier tube circuit through the voltage output port of one of the amplifier tube circuits to form a multi-stage amplifier tube circuit. The base control port of the first amplifier tube circuit in the multi-stage amplifier tube circuit is used to connect to the control circuit, and the voltage output port of the last amplifier tube circuit is set as the voltage output port of the power amplifier circuit.

14. The gate structure voltage control circuit according to claim 8, wherein The power amplifier circuit includes a plurality of amplifier tube circuits. The voltage output port of the previous amplifier tube circuit is connected to the voltage input port of the next amplifier tube circuit to form a multi-stage amplifier tube circuit. The base control port of at least one amplifier tube circuit in the multi-stage amplifier tube circuit is connected to the control circuit. The voltage input port of the first amplifier tube circuit in the multi-stage amplifier tube circuit is connected to the voltage establishing unit, and the voltage output port of the last amplifier tube circuit is set as the voltage output port of the power amplifier circuit.

15. The gate structure voltage control circuit according to claim 8, characterized in that, The control circuit is further configured to control the voltage of the base control port according to the gate structure voltage control instruction, and control the voltage of the base control port to be a preset control voltage after the voltage of the voltage output port reaches the gate structure target voltage.

16. The gate structure voltage control circuit according to claim 15, wherein The preset control voltage is the control voltage of the base port for maintaining the gate structure target voltage.

17. The gate structure voltage control circuit according to claim 8, wherein, The gate structure voltage control circuit further includes: a cathode parameter sampling circuit, connected to the control circuit, for sampling the operating parameters of the cathode in the X-ray tube. The control circuit adjusts the voltage of the base control port according to the operating parameters to control the gate structure target voltage to change following the operating parameters of the cathode in the X-ray tube.

18. The gate structure voltage control circuit according to claim 17, characterized in that The cathode parameter sampling circuit includes a cathode voltage sampling circuit and / or a tube current sampling circuit.

19. The gate structure voltage control circuit according to claim 8, characterized in that, The gate structure voltage control circuit further includes: A current limiting circuit, disposed between the voltage output port and the gate structure in the X-ray tube, for performing current limiting processing on the current output from the voltage output port.

20. The gate structure voltage control circuit according to claim 8, wherein The control circuit is a digital controller; a digital-to-analog conversion circuit is provided between the control circuit and the power amplifier circuit, and the digital-to-analog conversion circuit is configured to convert the digital control signal output by the control circuit into an analog control signal and output it to the base control port.

21. The gate structure voltage control circuit according to claim 8, characterized in that, The control circuit is further configured to adjust the output voltage of the voltage establishing unit to control the input voltage of the power amplifier circuit.

22. The gate structure voltage control circuit according to claim 8, wherein The gate structure voltage control circuit is integrated in the X-ray tube.

23. A multi-voltage output method, characterized in that, Including; Set the power amplifier circuit to operate in the linear region; wherein, the power amplifier circuit includes a base control port, a voltage input port and a voltage output port. Output a voltage control signal to the base control port to control the voltage output port of the power amplifier circuit to output a target voltage; wherein, the target voltage is any voltage within a preset output range; the preset output range is determined by a voltage establishing unit connected to the voltage input port.

24. The multi-voltage output method according to claim 23, wherein, Further includes: After the voltage at the voltage output port reaches the target voltage, control the voltage at the base control port of the power amplifier circuit to a preset control voltage.

25. A method for controlling the voltage of a grid structure, which is used to control the voltage of the grid structure in an X-ray tube, is characterized in that, The gate structure voltage control method includes: Set the power amplifier circuit to operate in the linear region; the power amplifier circuit includes a base control port, a voltage input port, and a voltage output port; Output a gate structure voltage control signal to the base control port according to the gate structure voltage control instruction, so that the voltage output port of the power amplifier circuit outputs a gate structure target voltage; wherein, the gate structure target voltage is any voltage within a preset output range; the preset output range is determined by a voltage establishing unit connected to the voltage input port.

26. The method for controlling the voltage of the gate structure according to claim 25, wherein The gate structure voltage control method further includes: Sample the operating parameters of the cathode in the X-ray tube; Adjust the voltage at the base control port according to the operating parameters to control the gate structure target voltage to change following the operating parameters of the cathode in the X-ray tube.

27. The method for controlling the voltage of the gate structure according to claim 25, wherein The gate structure voltage control method further includes: Control the voltage at the base control port according to the operating parameters of the cathode in the X-ray tube to adjust the voltage at the voltage output port.

28. An X-ray device, characterized in that, It includes an X-ray tube and the gate structure voltage control circuit according to any one of claims 8-22, wherein, the X-ray tube includes a gate structure, a cathode, and an anode, and the gate structure voltage control circuit is connected to the gate structure in the X-ray tube.

29. The X-ray device according to claim 28, characterized in that, It further includes: A high-voltage generator, which is used to provide power for the gate structure voltage control circuit.

30. The X-ray device according to claim 29, characterized in that, Optical fibers are used to establish communication between the high-voltage generator and the control circuit.

Images