High-voltage power supply and high-voltage power supply circuit for X-ray tube

Abstract

The utility model discloses a high-voltage power supply and a high-voltage power supply circuit for an X-ray tube. The high-voltage power supply circuit comprises a high-voltage circuit, a filament circuit, a control circuit, an over-temperature protection circuit and a global protection circuit. The high-voltage circuit is connected with the anode of the X-ray tube and is used for generating a target voltage signal; the filament circuit is connected with a filament of the X-ray tube and is used for generating filament working voltage; the over-temperature protection circuit is connected with the control circuit and is used for generating an over-temperature protection signal based on the filament temperature; the control circuit is connected with the high-voltage circuit and the filament circuit and is used for generating an enable signal based on the over-temperature protection signal or an external control signal; and the global protection circuit is connected with the control circuit, the high-voltage circuit and the filament circuit and is used for turning off the high-voltage circuit and the filament circuit based on the enable signal. By arranging the global protection circuit, the high-voltage circuit and the filament circuit can be started only after active enabling of a user, accidental starting or wrong operation is avoided, and the accident risk is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to nondestructive testing technical field, specifically about a kind of high voltage power supply and high voltage power supply circuit for X-ray tube. BACKGROUND

[0002] Traditional high-voltage power supply system has problems such as low efficiency and insufficient stability, especially under high load and frequent start-stop conditions, these problems are more prominent. Existing solutions often cannot meet the requirements of high precision, high stability and high efficiency, especially in the case of increasing demand in the fields of industry, medicine and scientific research, the protection mode of high-voltage power supply is single, and when accidental start or error operation occurs, it cannot effectively avoid accident risk.

[0003] Therefore, in view of the above technical problems, it is necessary to provide a high voltage power supply and high voltage power supply circuit for X-ray tube. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a high voltage power supply and high voltage power supply circuit for X-ray tube, which can avoid accidental start or error operation and reduce accident risk.

[0005] In order to achieve the above purpose, the technical scheme provided by a specific embodiment of the utility model is as follows:

[0006] A high voltage power supply circuit for X-ray tube, the X-ray tube includes anode and filament, the high voltage power supply circuit includes high voltage circuit, filament circuit, control circuit, over-temperature protection circuit and global protection circuit; wherein,

[0007] The high voltage circuit is connected with the anode of X-ray tube, and is used for generating target voltage signal;

[0008] The filament circuit is connected with the filament of X-ray tube, and is used for generating filament working voltage;

[0009] The over-temperature protection circuit is connected with the control circuit, and is used for generating over-temperature protection signal based on filament temperature;

[0010] The control circuit is connected with the high voltage circuit and the filament circuit, and is used for generating enable signal based on over-temperature protection signal or external control signal;

[0011] The global protection circuit is connected with the control circuit, the high voltage circuit and the filament circuit, and is used for shutting down the high voltage circuit and the filament circuit based on enable signal.

[0012] In one or more embodiments of the utility model, the high voltage circuit includes first oscillation module, voltage doubler module, tube voltage feedback acquisition module, tube voltage regulation module and voltage limiting protection module; wherein,

[0013] The first oscillation module is configured to generate a first PWM signal.

[0014] The voltage doubling module is connected with the first oscillation module and configured to generate a target voltage signal based on the first PWM signal, and to sample the target voltage signal and obtain a feedback voltage signal.

[0015] The tube voltage feedback acquisition module is connected with the voltage doubling module and configured to generate a first voltage signal and a second voltage signal based on the feedback voltage signal, respectively.

[0016] The tube voltage adjustment module is connected with the tube voltage feedback acquisition module and the first oscillation module, and configured to compare the second voltage signal with a first reference voltage signal and generate a first compensation signal, and the first oscillation module is configured to adjust the first PWM signal based on the first compensation signal.

[0017] The voltage limiting protection module is connected with the tube voltage feedback acquisition module and the tube voltage adjustment module, and configured to generate a voltage limiting signal, and the tube voltage adjustment module is configured to adjust the first PWM signal based on the voltage limiting signal.

[0018] In one or more embodiments of the present application, the filament circuit comprises a second oscillation module, a rectification module, a current feedback acquisition module, a filament voltage adjustment module and a filament protection module; wherein,

[0019] The second oscillation module is configured to generate a second PWM signal and generate a first filament voltage based on the second PWM signal.

[0020] The rectification module is connected with the second oscillation module and connected with the filament of the X-ray tube, and is configured to generate a second filament voltage based on the first filament voltage.

[0021] The current feedback acquisition module is connected with the rectification module and configured to generate a third voltage signal and a fourth voltage signal based on the second filament voltage, respectively.

[0022] The filament voltage adjustment module is connected with the current feedback acquisition module and the second oscillation module, and is configured to generate a second comparison signal based on the fourth voltage signal, a second reference voltage signal and a third reference voltage signal, and the second oscillation module is configured to adjust the second PWM signal based on the second comparison signal.

[0023] The filament protection module is connected with the second oscillation module, the rectification module and the control circuit, and is configured to generate a second shutdown signal based on the second filament voltage, the control circuit is configured to generate a first control signal based on the second shutdown signal, and the filament protection module is configured to shut down the second oscillation module based on the first control signal.

[0024] In one or more embodiments of the present application, the global protection circuit comprises a first clamping unit, a second clamping unit and an enable control unit; wherein,

[0025] The first clamping unit comprises a first amplifier and a first diode, the non-inverting input terminal of the first amplifier is connected with a reference potential, the inverting input terminal receives a first driving voltage or a second driving voltage, the output terminal is connected with the cathode of the first diode, and the anode of the first diode is connected with a high-voltage circuit;

[0026] The second clamping unit comprises a second amplifier and a second diode, the non-inverting input terminal of the second amplifier is connected with a reference potential, the inverting input terminal receives a first driving voltage or a second driving voltage, the output terminal is connected with the cathode of the second diode, and the anode of the second diode is connected with a filament circuit;

[0027] The enable control unit is connected with the first clamping unit and the second clamping unit, and is connected with a control circuit to receive an enable signal, when the enable signal is at a first level, the enable control unit generates a first driving voltage, the first clamping unit turns off the high-voltage circuit based on the first driving voltage, and the second clamping unit turns off the filament circuit based on the first driving voltage, when the enable signal is at a second level, the enable control unit generates a second driving voltage, the first clamping unit turns on the high-voltage circuit based on the second driving voltage, and the second clamping unit turns on the filament circuit based on the second driving voltage.

[0028] In one or more embodiments of the utility model, the enable control unit comprises a first bipolar transistor and a switching diode, wherein,

[0029] The control terminal of the first bipolar transistor is connected with the control circuit and receives the enable signal, the first end is connected with a reference potential, and the first end is directly or indirectly short-circuited with the control terminal, and the second end is connected with the third end of the switching diode;

[0030] The first end of the switching diode is connected with the inverting input terminal of the first amplifier, the second end of the switching diode is connected with the inverting input terminal of the second amplifier, and the third end of the switching diode is directly or indirectly connected with the first power supply voltage.

[0031] In one or more embodiments of the utility model, the first clamping unit further comprises a third diode, the cathode of the third diode is connected with the output terminal of the first amplifier, and the anode is connected with the filament circuit.

[0032] In one or more embodiments of the utility model, the over-temperature protection circuit comprises a first capacitor, a second capacitor, a first resistor, a second resistor and a third resistor;

[0033] The first end of the first capacitor is connected with a reference potential, the second end is connected with the first end of the first resistor, and the second end of the first resistor is connected with the control circuit through a connector;

[0034] The first end of the second capacitor is connected with a reference potential, the second end is connected with the first end of the second resistor, the second end of the second resistor is connected with the first end of the third resistor, and the second end of the third resistor is connected with the control circuit through the connector.

[0035] The technical scheme provided by another specific embodiment of the utility model is as follows:

[0036] A high-voltage power supply for an X-ray tube, the high-voltage power supply comprising a shell and a high-voltage power supply circuit arranged in the shell, the X-ray tube comprising an anode and a filament, the high-voltage power supply circuit comprising a high-voltage circuit, a filament circuit, a control circuit, an over-temperature protection circuit and a global protection circuit, the high-voltage power supply further comprising a temperature sensor arranged on the surface of the shell, the temperature sensor being used to collect the temperature of the filament and generate a first sensing signal representing the temperature;

[0037] The high-voltage circuit is connected with the anode of the X-ray tube and is used to generate a target voltage signal;

[0038] The filament circuit is connected with the filament of the X-ray tube and is used to generate a filament working voltage;

[0039] The over-temperature protection circuit is connected with the control circuit and is used to generate an over-temperature protection signal based on the first sensing signal;

[0040] The control circuit is connected with the high-voltage circuit and the filament circuit and is used to generate an enable signal based on the over-temperature protection signal or an external control signal;

[0041] The global protection circuit is connected with the control circuit, the high-voltage circuit and the filament circuit and is used to shut down the high-voltage circuit and the filament circuit based on the enable signal.

[0042] In one or more embodiments of the utility model, the shell is provided with a USB communication interface, an RS232 communication interface and a DC power input interface on one side;

[0043] The USB communication interface, the RS232 communication interface and the DC power input interface are connected with the control circuit.

[0044] In one or more embodiments of the utility model, part of the circuits in the over-temperature protection circuit and the high-voltage circuit are packaged in a first circuit board, and the remaining part of the circuits in the high-voltage circuit, the filament circuit, the control circuit and the global protection circuit are packaged in a second circuit board;

[0045] The first circuit board and the second circuit board are arranged inside the shell, and the first circuit board and the second circuit board are filled with silicone rubber between the inner surface of the shell.

[0046] Compared with the prior art, the high-voltage power supply and the high-voltage power supply circuit for the X-ray tube have the global protection circuit, and the high-voltage circuit and the filament circuit can be started only after the user actively enables, so that the accidental start or the wrong operation is avoided, and the accident risk is reduced.

[0047] The temperature sensor and the corresponding over-temperature protection circuit are arranged, and over-temperature protection is realized.

[0048] The rectifier module is arranged to rectify the alternating voltage output by the second transformer of the filament circuit, so that the direct current voltage is obtained to supply power to the filament, the light source of the X-ray tube is more stable and smooth, the thermal fatigue of the filament is reduced, and the corresponding protection function is arranged for the filament circuit, so that the service life of the filament is effectively prolonged.

[0049] The silicon rubber is filled between the shell and the circuit board to form a protection layer, so as to protect the electronic elements and the circuit board inside, improve the insulation performance of the high-voltage power supply, prevent high-voltage breakdown short circuit, and prevent moisture, dust and other external factors from causing damage to the inside of the power supply.

[0050] The high-voltage power supply supports multiple communication modes, does not need to be manually configured, has high transmission rate, wide compatibility and strong anti-interference ability.

[0051] The corresponding protection modules are arranged in the high-voltage circuit and the filament circuit to reduce the failure rate, improve the overall reliability of the system, ensure that the equipment operates in the best state, and improve the use efficiency and safety of the high-voltage power supply. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the present application, and those skilled in the art can obtain other drawings according to these drawings without creating labor.

[0053] Figure 1 It is a schematic diagram of the high-voltage power supply circuit for the X-ray tube in an embodiment of the present application.

[0054] Figure 2 It is a first oscillation module circuit diagram of the high-voltage power supply circuit for the X-ray tube in an embodiment of the present application.

[0055] Figure 3 It is a second circuit board schematic diagram of the high-voltage power supply circuit for the X-ray tube in an embodiment of the present application.

[0056] Figure 4 It is a circuit diagram of the first transformer of the high-voltage power supply circuit for the X-ray tube in an embodiment of the present application.

[0057] Figure 5 Circuit diagram of the voltage doubling unit and the sampling unit circuit of the high-voltage power supply circuit for the X-ray tube in an embodiment of the present application;

[0058] Figure 6 Circuit diagram of the high-voltage circuit part of the high-voltage power supply circuit for the X-ray tube in an embodiment of the present application;

[0059] Figure 7 Circuit diagram of the tube voltage feedback acquisition module of the high-voltage power supply circuit for the X-ray tube in an embodiment of the present application;

[0060] Figure 8 Circuit diagram of the tube voltage regulation module of the high-voltage power supply circuit for the X-ray tube in an embodiment of the present application;

[0061] Figure 9 Circuit diagram of the voltage limiting protection module of the high-voltage power supply circuit for the X-ray tube in an embodiment of the present application;

[0062] Figure 10 Circuit diagram of the second oscillation module of the high-voltage power supply circuit for the X-ray tube in embodiment 1 of the present application;

[0063] Figure 11 Circuit diagram of the rectification module of the high-voltage power supply circuit for the X-ray tube in embodiment 1 of the present application;

[0064] Figure 12 Circuit diagram of the current feedback acquisition module of the high-voltage power supply circuit for the X-ray tube in embodiment 1 of the present application;

[0065] Figure 13 Circuit diagram of the tube current feedback acquisition module of the high-voltage power supply circuit for the X-ray tube in embodiment 1 of the present application;

[0066] Figure 14 Circuit diagram of the filament voltage regulation module of the high-voltage power supply circuit for the X-ray tube in embodiment 1 of the present application;

[0067] Figure 15 Circuit diagram of the filament protection module of the high-voltage power supply circuit for the X-ray tube in embodiment 1 of the present application;

[0068] Figure 16 Circuit diagram of the current limiting module of the high-voltage power supply circuit for the X-ray tube in embodiment 1 of the present application;

[0069] Figure 17 Circuit diagram of the global protection circuit of the high-voltage power supply circuit for the X-ray tube in embodiment 1 of the present application;

[0070] Figure 18The shell schematic view of the high-voltage power supply for the X-ray tube in the embodiment 2 of the utility model;

[0071] Figure 19 The shell schematic view of the high-voltage power supply for the X-ray tube in the embodiment 2 of the utility model;

[0072] Figure 20 The shell schematic view of the high-voltage power supply for the X-ray tube in the embodiment 2 of the utility model. DETAILED DESCRIPTION

[0073] In order to make the personnel in the technical field better understand the technical scheme in the utility model, the technical scheme in the embodiment of the utility model will be described clearly and completely in the following with reference to the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the utility model.

[0074] Unless otherwise explicitly indicated, in the entire specification and claims, the term "comprise" or its variants such as "contain" or "include" and the like will be understood to include the stated element or component, but not exclude other elements or components.

[0075] In the specification, "coupling" or "connection" or "connection" includes both direct connection and indirect connection. Indirect connection is the connection through an intermediate medium, such as the connection through an electrically conductive medium, which can have a parasitic inductance or a parasitic capacitance; indirect connection can also include the connection through other active devices or passive devices on the basis of achieving the same or similar functional purposes, such as the connection through circuits or components such as switches, follower circuits, etc. In addition, in the utility model, for example, the words "first", "second" and the like are mainly used to distinguish one technical feature from another technical feature, and do not necessarily require or imply a certain actual relationship, quantity or order between the technical features.

[0076] In the detailed description of the specification, the drawings forming a part thereof are referred to, wherein the same reference signs always represent the same parts, and wherein the exemplary embodiments can be shown by way of example. It should be understood that other embodiments can be utilized without departing from the scope of the present disclosure, and structural or logical changes can be made. Therefore, the following detailed description should not be regarded as limiting.

[0077] The various operations in the specification may be described sequentially as multiple discrete actions or operations in a manner most conducive to understanding the claimed subject matter. However, the order of description should not be construed as implying that these operations must be sequentially related. Specifically, these operations may not be performed in the order presented. The described operations may be performed in a different order than in the described embodiments. Various additional operations may be performed in additional embodiments and / or the described operations may be omitted.

[0078] For the purposes of this disclosure, the phrase “A and / or B” means (A), (B), or (A and B). For the purposes of this disclosure, the phrase “A, B and / or C” means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).

[0079] Various components and devices may be referred to or shown in the singular (e.g., “MOS transistor”, “transistor”, “switch”, etc.) in this document, but only for the convenience of discussion, and any element referred to in the singular may include multiple such elements as taught herein.

[0080] The description uses the phrases "in one embodiment," "in other embodiments," or "in some embodiments," each of which may refer to one or more of the same or different embodiments. Furthermore, the terms "comprising," "including," "having," etc., used with respect to embodiments of this disclosure are synonymous.

[0081] Example 1:

[0082] like Figure 1 As shown, in one embodiment of this utility model, a high-voltage power supply circuit for an X-ray tube is provided. The X-ray tube includes an anode and a filament. The high-voltage power supply circuit includes a high-voltage circuit 10, a filament circuit 20, a control circuit 40, an over-temperature protection circuit 30, and a global protection circuit 50.

[0083] Specifically, the high-voltage circuit 10 is connected to the anode of the X-ray tube to generate the target voltage signal HV_out;

[0084] The filament circuit 20 is connected to the filament of the X-ray tube and is used to generate the filament operating voltage;

[0085] The over-temperature protection circuit 30 is connected to the control circuit 40 and the temperature sensor, and is used to generate an over-temperature protection signal based on the filament temperature.

[0086] The control circuit 40 is connected to the high-voltage circuit 10 and the filament circuit 20, and is used to generate an enable signal PTE9 based on the over-temperature protection signal or the external control signal. In this embodiment, the control circuit 40 includes a microcontroller.

[0087] The global protection circuit 50 is connected with the control circuit 40, the high-voltage circuit 10 and the filament circuit 20, and is used for shutting down the high-voltage circuit 10 and the filament circuit 20 or starting the high-voltage circuit 10 and the filament circuit 20 based on the enable signal PTE9.

[0088] The high-voltage circuit 10 in the embodiment comprises a first oscillation module, a voltage doubling module, a tube voltage feedback acquisition module, a tube voltage regulation module and a voltage limiting protection module.

[0089] As shown in the figure, Figure 2 The first oscillation module is used for generating a first PWM signal HV VCO. The first oscillation module comprises a pulse modulation chip U17 and its peripheral circuit, and preferably, the model of the pulse modulation chip U17 is UC3525ADW. In the embodiment, the peripheral circuit of the pulse modulation chip U17 comprises a power tube Q5 and a resistor R100, the control end of the power tube Q5 is connected with the second end of the resistor Q100, the first end of the resistor R100 is connected with the control circuit 40 to receive the signal PTE10, the second end of the power tube Q5 is indirectly connected with the RT pin 6 of the pulse modulation chip U17, the control circuit 40 controls the starting and shutting down of the power tube Q5 by generating the signal PTE10, thereby controlling the state of the pulse modulation chip U17, and when the RT pin 6 of the pulse modulation chip U17 is at a first level, the pulse modulation chip U17 works and generates the first PWM signal HV VCO through the OutputA pin 11. Further, the first oscillation module further comprises a voltage dividing resistor R93, the first end of the voltage dividing resistor R93 is connected with the tube voltage regulation module (as shown in S11 in the figure), Figure 2 and the second end is connected with the Compensation pin 9 of the pulse modulation chip U17.

[0090] Further, the first oscillation module in the embodiment further comprises a surge protection unit, the surge protection unit comprises an ESD protection diode CR10 and an ESD protection diode CR11, and preferably, the model of the ESD protection diode CR10 and the ESD protection diode CR11 is SMAJ15CA-13-F. Specifically, the first end of the ESD protection diode CR10 is indirectly connected with the pin 14 of the pulse modulation chip U17, and the second end is connected with a reference potential. The first end of the ESD protection diode CR11 is indirectly connected with the pin 11 of the pulse modulation chip U17, and the second end is connected with a reference potential, wherein the voltage of the first end of the ESD protection diode CR11 is the first PWM signal HV VCO. It can be understood that the reference potential involved in the utility model can be regarded as the ground potential.

[0091] As shown in the figure, Figure 3As shown, in this embodiment, the voltage multiplier module and the over-temperature protection circuit are packaged on the same circuit board (i.e., the second circuit board). Specifically, the voltage multiplier module is connected to the first oscillation module and is used to generate a target voltage signal HV_out based on the first PWM signal HV VCO, and to sample the target voltage signal HV_out to obtain a feedback voltage signal KV_FDBK.

[0092] The voltage multiplier module in this embodiment includes a voltage multiplier unit, a sampling unit, a first power transistor Q1, a second power transistor Q2, and a first transformer T1. Further, in this embodiment, the voltage multiplier module and the first oscillation module are connected via a control circuit 40 and a connector JB1. Specifically, the control circuit 40 receives the first PWM signal HV VCO generated by the first oscillation module and transmits it to the voltage multiplier module via connector JB1.

[0093] like Figure 4 As shown, the control terminal of the first power transistor Q1 is connected to pin 8 of connector JB1 and receives the first PWM signal HV VCO. The control terminal is shorted to the first terminal, and the second terminal is connected to the first terminal of the primary inductor of the first transformer T1. The control terminal of the second power transistor Q2 is connected to pin 2 of connector JB1 and receives the first PWM signal HV VCO. The control terminal is shorted to the first terminal, and the second terminal is connected to the second terminal of the primary inductor of the first transformer T1. The first PWM signal HV VCO controls the first power transistor Q1 and the second power transistor Q2. The second terminals of the first power transistor Q1 and the second power transistor Q2 output high-frequency AC signals that couple with the first transformer T1. The secondary inductor side of the first transformer T1 outputs a primary high voltage T1_6 to the voltage multiplier unit.

[0094] like Figure 5 As shown, in this embodiment, the voltage multiplier unit utilizes the unidirectional conductivity of a diode and the energy storage characteristics of a capacitor. During each half-cycle of the AC input voltage, the capacitors in the voltage multiplier unit alternately charge and discharge, ultimately obtaining a DC voltage at the output that is N times the input voltage. In this embodiment, the voltage multiplier unit is a 6th-order voltage multiplier circuit. The target voltage signal HV_out generated by the 6th-order voltage multiplier circuit is the operating voltage of the X-ray tube, with a total voltage approximately 64 times the peak input voltage.

[0095] like Figure 5 As shown, the voltage multiplier module in this embodiment also includes a sampling unit. The sampling unit is connected to pin 1 (i.e., JB1_1) of the voltage multiplier unit and connector JB1, and is used to obtain the feedback voltage signal KV_FDBK (via the target voltage signal HV_out) based on the target voltage signal HV_out. Figure 5 As shown in the JB1_1 output, connector JB1 outputs the feedback voltage signal KV_FDBK to the tube voltage feedback acquisition module.

[0096] like Figure 6As shown in FIG. 4, a schematic diagram of the connection relationship among the tube pressure feedback acquisition module, the tube pressure adjusting module and the voltage limiting protection module is shown. The tube pressure feedback acquisition module is connected with the voltage doubling module, for generating the first voltage signal adc_hv and the second voltage signal TP_KV_FDBK based on the feedback voltage signal KV_FDBK. The tube pressure adjusting module is connected with the tube pressure feedback acquisition module and the first oscillation module, for comparing the second voltage signal TP_KV_FDBK with the first reference voltage signal set_hv and generating the first compensation signal, and the first oscillation module is used for adjusting the first PWM signal HV VCO based on the first compensation signal. The voltage limiting protection module is connected with the tube pressure feedback acquisition module and the tube pressure adjusting module, for generating the voltage limiting signal, and the tube pressure adjusting module adjusts the first PWM signal HV VCO based on the voltage limiting signal.

[0097] As shown in FIG. 5, the tube pressure feedback acquisition module in the embodiment includes the amplifier OP1D and its peripheral circuit, the amplifier OP1A and its peripheral circuit, and the model of the amplifier OP1D is preferably OPA4277UA. Figure 7

[0098] Specifically, the non-inverting input terminal of the amplifier OP1D is connected with the reference potential, the inverting input terminal of the amplifier OP1D receives the feedback voltage signal KV_FDBK, and the output terminal of the amplifier OP1D is connected with the tube pressure adjusting module and the voltage limiting protection module and generates the second voltage signal TP_KV_FDBK. The inverting input terminal of the amplifier OP1A is connected with the output terminal of the amplifier OP1D, the non-inverting input terminal of the amplifier OP1A is short-circuited with the output terminal of the amplifier OP1A, and the output terminal of the amplifier OP1A is connected with the control circuit 40 and generates the first voltage signal adc_hv. The control circuit 40 includes an analog-to-digital converter ADC, the analog-to-digital converter ADC is connected with the output terminal of the amplifier OP1A, and the analog-to-digital converter ADC is used for analog-to-digital conversion of the first voltage signal adc_hv, so that the control circuit 40 reads the first voltage signal adc_hv.

[0099] As shown in FIG. 6, the tube pressure adjusting module in the embodiment includes the amplifier OP2A and its peripheral circuit, the amplifier OP2B and its peripheral circuit, and the model of the amplifier OP2A is preferably OPA4277UA. Figure 8 ​As shown, in this embodiment, the tube voltage regulation module includes amplifier OP1B and its peripheral circuits, and amplifier OP1C and its peripheral circuits. The non-inverting input terminal of amplifier OP1B receives the first reference voltage signal set_hv. The inverting input terminal of amplifier OP1B is connected to the output terminal of amplifier OP1D and receives the second voltage signal TP_KV_FDBK, and is directly or indirectly connected to the non-inverting input terminal of amplifier OP1C. The output terminal of amplifier OP1B is connected to the inverting input terminal 6 of amplifier OP1B through capacitor C96. The inverting input terminal of amplifier OP1C is connected to the power supply voltage -10VAA (-10V), and the inverting input terminal of amplifier OP1C is short-circuited to the output terminal of amplifier OP1C. The output terminal 8 of amplifier OP1C is directly or indirectly connected to the Compensation pin 9 of pulse modulation chip U17. Figure 8 In the diagram, S11 represents the connection point with the first oscillation module.

[0100] like Figure 9 As shown, the voltage limiting protection module includes amplifier OP2A and its peripheral circuits, amplifier OP2D and its peripheral circuits, and amplifier OP2C and its peripheral circuits. The inverting input of amplifier OP2A is connected to a reference potential, and the non-inverting input of amplifier OP2A is connected to the tube voltage feedback acquisition module and the tube voltage regulation module to receive the second voltage signal TP_KV_FDBK. The output of amplifier OP2A is connected to the inverting input of amplifier OP2D, the non-inverting input of amplifier OP2D is connected to the reference potential, the output of amplifier OP2D is connected to the inverting input of amplifier OP2C, the non-inverting input of amplifier OP2C is connected to the power supply voltage +10VAA (+10V), the output of amplifier OP2C is connected to the cathode of diode CR12 in the tube voltage regulation module (i.e., S13 shown), and the anode of diode CR12 is connected to the non-inverting input of amplifier OP2C.

[0101] Understandably, when the second voltage signal TP_KV_FDBK is greater than the set value, the voltage limiting protection module generates a voltage limiting signal. Based on the voltage limiting signal, diode CR12 clamps the non-inverting input terminal of amplifier OP1C, thereby regulating the first PWM signal HV VCO and preventing the target voltage signal HV_out from exceeding the maximum operating voltage of the X-ray tube.

[0102] In this embodiment, the filament circuit 20 includes a second oscillation module, a rectification module, a current feedback acquisition module, a filament voltage adjustment module, a filament protection module, and a tube current feedback acquisition module.

[0103] like Figure 10As shown, the second oscillation module is configured to generate a second PWM signal and generate the first filament voltage based on the second PWM signal. The second oscillation module includes a pulse modulation chip U20, a third power tube Q6, a fourth power tube Q7, and a second transformer T2. The OUTPUT A pin 13 and the OUTPUT B pin of the pulse modulation chip U20 are configured to generate the second PWM signal. The OUTPUT A pin 13 of the pulse modulation chip U20 is connected to the control end of the fourth power tube Q7. The first end of the fourth power tube Q7 is connected to the reference potential, and the second end is connected to the first end of the primary inductor of the second transformer T2. The OUTPUT B pin 16 of the pulse modulation chip U20 is connected to the control end of the third power tube Q6. The first end of the third power tube Q6 is connected to the reference potential, and the second end is connected to the second end of the primary inductor of the second transformer T2. The secondary inductor of the second transformer T2 generates the first filament voltage. It can be understood that the pulse modulation chip U20 generates the second PWM signal, and controls the third power tube Q6 and the fourth power tube Q7 through the second PWM signal. The high-frequency alternating current signals output by the third power tube Q6 and the fourth power tube Q7 are coupled with the second transformer T2 to generate the first filament voltage without filtering.

[0104] The rectification module is connected to the second oscillation module and the filament of the X-ray tube, and is configured to generate a second filament voltage FIL_OUT based on the first filament voltage.

[0105] As shown, Figure 11 The rectification module includes a rectifier diode D8, a rectifier diode D9, a first inductor L6, a capacitor C126, a capacitor C156, a capacitor C157, and a sampling resistor R150. The first end of the rectifier diode D8 is connected to the first end of the secondary inductor of the second transformer T2, and the second end is connected to the first end of the first inductor L6. The first end of the rectifier diode D9 is connected to the second end of the secondary inductor of the second transformer T2, and the second end is connected to the first end of the first inductor L6. The second end of the first inductor L6 is connected to the first end of the capacitor C126, the capacitor C156, the capacitor C157, and the sampling resistor R150, and generates the second filament voltage FIL_OUT. The capacitor C126, the capacitor C156, and the capacitor C157 are connected to the connector CN8, and the second end of the sampling resistor R150 is connected to the connector CN8. It can be understood that the rectification module is configured to filter out the high-frequency alternating current signal in the first filament voltage to generate a stable direct-current second filament voltage FIL_OUT, and output the second filament voltage FIL_OUT to the filament of the X-ray tube through the connector CN8. The second filament voltage FIL_OUT serves as the power supply voltage of the filament.

[0106] The current feedback acquisition module is connected to the rectification module and is configured to generate a third voltage signal adc_fil_ma and a fourth voltage signal FIL_MA based on the second filament voltage FIL_OUT.

[0107] As shown in Figure 12 , the current feedback acquisition module comprises an operational amplifier chip U18 and its peripheral circuit, an operational amplifier chip U21 and its peripheral circuit, and a resistor R130. The model of the operational amplifier chip U18 is preferably INA128UA / 2K5, and the model of the operational amplifier chip U21 is preferably AD8421ARZ-R7.

[0108] The V-IN pin 2 and the V+IN pin 3 of the operational amplifier chip U18 receive the second filament voltage FIL_OUT, and the VO pin 6 generates the fourth voltage signal FIL_MA. The V-IN pin 1 and the V+IN pin 4 of the operational amplifier chip U21 are connected to the V-IN pin 2 and the V+IN pin 3 of the operational amplifier chip U18 respectively, and the VOUT pin 7 of the operational amplifier chip U21 is connected to the VO pin 6 of the operational amplifier chip U18.

[0109] The first end of the resistor R130 is connected to the VO pin 6 of the operational amplifier chip U18, and the second end is connected to the analog-to-digital converter ADC of the control circuit 40 and generates the third voltage signal adc_fil_ma. The analog-to-digital converter ADC is used to perform analog-to-digital conversion on the third voltage signal adc_fil_ma, so that the control circuit 40 reads the third voltage signal adc_fil_ma.

[0110] As shown in Figure 13 , the tube current feedback acquisition module comprises an operational amplifier chip U19 and its peripheral circuit, an amplifier OP3C and its peripheral circuit, and an amplifier OP2B and its peripheral circuit. The V+IN pin 3 of the operational amplifier chip U19 is connected to the rectifier module, the VO pin 6 of the operational amplifier chip U19 is connected to the non-inverting input terminal of the amplifier OP3C, and the non-inverting input terminal of the amplifier OP3C is connected to the reference potential. The inverting input terminal of the amplifier OP3C is connected to the reference potential and is short-circuited to the output terminal of the amplifier OP3C. The output terminal of the amplifier OP3C is connected to the filament voltage regulation module, the voltage limiting protection circuit, and the non-inverting input terminal of the amplifier OP2B and generates the signal mA FDBK. The inverting input terminal of the amplifier OP2B is short-circuited to the output terminal, and is connected to the control circuit 40 and generates the signal adc_ma.

[0111] The filament voltage regulation module is connected to the current feedback acquisition module and the second oscillation module, and is used to generate a second comparison signal based on the fourth voltage signal FIL_MA, the second reference voltage signal set_ma, and the third reference voltage signal set_ph. The second oscillation module is used to adjust the second PWM signal based on the second comparison signal.

[0112] As shown in Figure 14As shown in the figure, the filament voltage regulation module includes an amplifier OP3B and its peripheral circuit, an amplifier OP3D and its peripheral circuit, and an amplifier OP3A and its peripheral circuit. The inverting input terminal of the amplifier OP3B is connected with the tube current feedback acquisition module, the non-inverting input terminal of the amplifier OP3B receives a second reference voltage signal set_ma, the second reference voltage signal set_ma is an upper limit value of the tube current, the output terminal of the amplifier OP3B is connected with the non-inverting input terminal of the amplifier OP3D, the inverting input terminal of the amplifier OP3D is short-circuited with the output terminal and receives a third reference signal set_ph, wherein the third reference signal set_ph is an upper limit value of the filament current. The non-inverting input terminal of the amplifier OP3D is connected with the filament protection module. The output terminal of the amplifier OP3D is connected with the non-inverting input terminal of the amplifier OP3A, the inverting input terminal of the amplifier OP3A is short-circuited with the output terminal, and the output terminal of the amplifier OP3A is connected with the COMP pin 4 of the pulse modulation chip U20.

[0113] As shown in the figure, Figure 15 The filament protection module is connected with the second oscillation module, the rectification module and the control circuit 40, and is used to generate a second shutdown signal FIL_V based on the second filament voltage FIL_OUT. The control circuit generates a first control signal shutdown based on the second shutdown signal FIL_V, and the filament protection module shuts down the second oscillation module based on the first control signal shutdown.

[0114] The filament protection module includes an amplifier OP4B and its peripheral circuit, a diode D12 and an eighth power tube Q8. The non-inverting input terminal and the inverting input terminal of the amplifier OP4B are connected with the rectification module, the output terminal generates the second shutdown signal FIL_V, and the output terminal is connected with the control circuit 40. The control circuit 40 generates the first control signal shutdown based on the second shutdown signal FIL_V. The anode of the diode D12 receives the control signal shutdown, the cathode is connected with the control terminal of the eighth power tube Q8, the first terminal of the eighth power tube Q8 is connected with the reference potential, and the second terminal is connected with the SHUTDOWN# pin 8 of the pulse modulation chip U20 in the second oscillation module. The second oscillation module is stopped by controlling the eighth power tube Q8 to shut down. In the embodiment, the model of the diode D12 is preferably B5819WS-MS. As shown in the figure, Figure 16 The current limiting module is connected with the filament voltage regulation module, and is used to limit the upper limit value of the fourth voltage signal. The current limiting module includes an amplifier OP4A and its peripheral circuit. The non-inverting input terminal of the amplifier OP4A receives a filament limiting voltage set_limit, the inverting input terminal is short-circuited with the output terminal, and the inverting input terminal is connected with the filament voltage regulation module and the global protection circuit 50.

[0115] As shown in the figure, Figure 17As shown, the global protection circuit 50 comprises a first clamping unit, a second clamping unit and an enable control unit.

[0116] The first clamping unit comprises a first amplifier OP4D and its peripheral circuit, a first diode CR33, the non-inverting input terminal 12 of the first amplifier OP4D is connected to a reference potential, the inverting input terminal 13 receives a first driving voltage or a second driving voltage, the output terminal 14 is connected to the cathode of the first diode CR33, and the anode of the first diode CR33 is connected to the high-voltage circuit 10.

[0117] The second clamping unit comprises a second amplifier OP4C and its peripheral circuit, a second diode CR29, the non-inverting input terminal 10 of the second amplifier OP4C is connected to a reference potential, the inverting input terminal 9 receives a first driving voltage or a second driving voltage, the output terminal is connected to the cathode of the second diode CR29, and the anode of the second diode CR29 is connected to the filament circuit 20.

[0118] The enable control unit is connected to the first clamping unit and the second clamping unit, and is connected to the control circuit 40 to receive an enable signal PTE9. When the enable signal PTE9 is at a first level (high level), the enable control unit generates a first driving voltage +10VAA (10V), and the first clamping unit and the second clamping unit turn off the high-voltage circuit 10 and the filament circuit 20 based on the first driving voltage +10VAA (10V). When the enable signal PTE9 is at a second level (low level), the enable control unit generates a second driving voltage -10V_EN (-10V), and the first clamping unit and the second clamping unit turn on the high-voltage circuit 10 and the filament circuit 20 based on the second driving voltage -10V_EN (-10V).

[0119] The enable control unit comprises a first bipolar transistor Q9 and a switching diode CR31, and corresponding peripheral circuits; wherein,

[0120] The control terminal of the first bipolar transistor Q9 is connected to the control circuit 40 and receives the enable signal PTE9, the first terminal is connected to a reference potential, and the first terminal is directly or indirectly connected to the control terminal, and the second terminal is connected to the third terminal of the switching diode CR31;

[0121] The first terminal of the switching diode CR31 is connected to the inverting input terminal of the first amplifier OP4C, and is used to generate a first driving voltage or a second driving voltage, the second terminal of the switching diode CR31 is connected to the inverting input terminal of the second amplifier OP4D, and is used to generate a first driving voltage or a second driving voltage, and the third terminal of the switching diode CR31 is directly or indirectly connected to the first power supply voltage VDD (3.3V).

[0122] The first clamping unit further comprises a third diode CR34, the cathode of which is connected to the output of the first amplifier OP4D, and the anode of which is connected to the filament circuit 20.

[0123] The global protection circuit 50 utilizes the clamping effect of diodes, and only after the user actively enables can the high-voltage circuit 10 and the filament circuit 20 be started, thereby avoiding the mis-starting of the high-voltage circuit 10 and the filament circuit 20 and abnormal output. When the enable signal PTE9 is at the first level (high level), the first bipolar transistor Q9 is turned on, and the enable control unit generates a first driving voltage +10VAA (10V), that is, the inverting input end 13 of the second amplifier OP4D inputs a positive voltage, so that the output end 14 of the second amplifier OP4D outputs a negative voltage. Similarly, the inverting input end 9 of the first amplifier OP4C inputs a negative voltage, so that the output end 8 of the first amplifier OP4C outputs a negative voltage. Based on the clamping effect of the first diode CR33 and the second diode CR29, the anode of the first diode CR33 and the anode of the second diode CR29 are both negative voltages. The anode of the first diode CR33 is connected to the non-inverting input end of the amplifier OP1B, that is, the voltage TP_KV_PROG on the non-inverting input end of the amplifier OP1B is a negative voltage, resulting in a negative voltage output of the amplifier OP1B, and further causing the high-voltage circuit 10 to be unable to start. The anode of the second diode CR29 is connected to the non-inverting input end of the amplifier OP3B, and similarly, the voltage on the non-inverting input end of the amplifier OP3B is a negative voltage, resulting in a negative voltage output of the amplifier OP3B, and further causing the filament circuit 20 to be unable to start.

[0124] Conversely, when the enable signal PTE9 is at the second level (low level), the first bipolar transistor Q9 is turned off, and the enable control unit generates a second driving voltage -10V_EN (-10V), that is, the inverting input end 13 of the second amplifier OP4D inputs a negative voltage, so that the output end 14 of the second amplifier OP4D outputs a positive voltage. Similarly, the inverting input end 9 of the first amplifier OP4C inputs a positive voltage, so that the output end 8 of the first amplifier OP4C outputs a positive voltage. Based on the clamping effect of the first diode CR33 and the second diode CR29, the voltages on the non-inverting input end of the amplifier OP1B and the non-inverting input end of the amplifier OP3B are not affected by the first diode CR33 and the second diode CR29, and the filament circuit 20 and the high-voltage circuit 10 work normally.

[0125] Further, the global protection circuit 50 in the embodiment is also used to limit the tube current output when the tube current is abnormal, so as to avoid burning the filament. When the tube current is abnormal, the anode of the diode CR18 connected to the output end of the amplifier OP3B is connected to the positive input end of the amplifier OP3D and the first end of the resistor R177, the amplifier OP4A is a positive follower, the positive input end of the amplifier OP4A is connected to the filament limiting voltage set_limit (the signal limits the maximum value of the filament voltage, and the voltage value is the maximum voltage that the filament can withstand), and the output end of the amplifier OP4A is connected to the second end of the resistor R177. Due to the clamping effect of the diode CR18 and the third diode CR34, when the cathode voltage of the third diode CR34 is less than the filament limiting voltage set_limit, the cathode voltage of the third diode CR34 is equal to the filament limiting voltage set_limit minus the diode voltage drop, and when the cathode voltage of the third diode CR34 is greater than the filament limiting voltage set_limit, the situation that the filament voltage rises sharply and burns the filament is effectively avoided.

[0126] As shown in Figure 4 , the over-temperature protection circuit 30 includes a first capacitor C10, a second capacitor C8, a first resistor R3, a second resistor R4, and a third resistor R2;

[0127] The first end of the first capacitor C10 is connected to a reference potential, the second end is connected to the first port 1 of the temperature sensor AD590LH and the first end of the first resistor R3, and the second end of the first resistor R3 is connected to the control circuit 40 through the connector JB1;

[0128] The first end of the second capacitor C8 is connected to a reference potential and the third port of the temperature sensor AD590LH, the second end is connected to the first end of the second resistor R4, the second end of the second resistor R4 is connected to the second port 2 of the temperature sensor AD590LH and the first end of the third resistor R2, and the second end of the third resistor R2 is connected to the control circuit 40 through the connector JB1. It can be understood that the over-temperature protection circuit 30 in the embodiment is connected to the control circuit, and is used to generate an over-temperature protection signal based on the filament temperature, that is, the over-temperature protection signal is generated when the filament temperature exceeds the set threshold, and the control circuit 40 can generate an enable signal PTE9 (high level) based on the over-temperature protection signal to stop the filament circuit and the high-voltage circuit from working.

[0129] Embodiment 2:

[0130] As shown in Figures 18-20As shown, a high-voltage power supply for an X-ray tube, the high-voltage power supply comprising a housing and a high-voltage power supply circuit arranged in the housing, the X-ray tube comprising an anode and a filament, the high-voltage power supply circuit comprising a high-voltage circuit, a filament circuit, a control circuit, an over-temperature protection circuit and a global protection circuit, the high-voltage power supply further comprising a temperature sensor arranged on a surface of the housing, the temperature sensor being configured to collect a temperature of the filament and generate a first sensing signal representing the temperature.

[0131] The high-voltage circuit is connected to the anode of the X-ray tube and configured to generate a target voltage signal (i.e. Figure 19 HV_OUT as shown), the filament circuit is connected to the filament of the X-ray tube and configured to generate a filament operating voltage (i.e. Figure 20 filament output as shown), the over-temperature protection circuit is connected to the control circuit and configured to generate an over-temperature protection signal based on the first sensing signal, the control circuit is connected to the high-voltage circuit and the filament circuit and configured to generate an enable signal based on the over-temperature protection signal or an external control signal, and the global protection circuit is connected to the control circuit, the high-voltage circuit and the filament circuit and configured to shut down the high-voltage circuit and the filament circuit based on the enable signal.

[0132] The housing is provided with a USB communication interface, an RS232 communication interface and a DC power input interface, which are connected to the control circuit 40. The high-voltage power supply further comprises a communication circuit 70 connected to the control circuit 40, the communication circuit 70 comprising an RS232 communication unit, a USB communication unit, an offline adjustment unit and an analog adjustment unit. The USB communication unit is configured to realize USB to high-speed asynchronous serial port conversion, support communication baud rate of 50bps-6Mbps, realize mutual conversion between USB signal level and UART signal level, and provide an ESD protection diode array at the USB communication interface to avoid static damage to the serial port. The circuit uses an optocoupler chip to effectively isolate the input side from the output side, thereby protecting the device from high-voltage surges and electromagnetic interference, preventing current backflow from damaging the serial port when the system fails. The RS232 communication unit is configured to realize RS232 to high-speed asynchronous serial port conversion, realize mutual conversion between RS232 and TTL level, support communication baud rate of 250kbps, and have strong anti-static ability.

[0133] The host computer realizes USB communication with the control circuit 40 through the USB communication interface and the USB communication unit, and realizes RS232 communication with the control circuit 40 through the RS232 communication interface and the RS232 communication unit.

[0134] Further, the off-line adjusting unit comprises four slide rheostats corresponding to the tube voltage, the tube current, the filament limiting voltage and the filament preheating voltage, and the output voltage is adjusted to the control circuit 40 by adjusting the resistance of the slide rheostats through the voltage division principle of the series circuit, so that the tube voltage, the tube current, the filament limiting voltage and the filament preheating voltage are adjusted off-line.

[0135] Further, the analog adjusting unit inputs analog quantities to the connector through the outside, and the pin 3, the pin 6, the pin 5, the pin 2 and the pin 8 of the connector correspond to the tube voltage setting, the tube current setting, the tube voltage detection, the tube current detection and the high voltage enablement respectively.

[0136] The over-temperature protection circuit 30 and part of the circuits in the high voltage circuit 10 are packaged in the first circuit board, and the rest of the circuits in the high voltage circuit 10, the filament circuit 20, the control circuit 40 and the global protection circuit 50 are packaged in the second circuit board.

[0137] The first circuit board and the second circuit board are arranged in the inside of the shell, and the first circuit board and the second circuit board are filled with silicone rubber between the inside surface of the shell.

[0138] The high voltage power supply provided by the embodiment has low static power consumption, and the voltage is 24V and the current is 80mA in the static state, and the power consumption is less than 2W.

[0139] It can be seen from the above technical solutions that the utility model has the following beneficial effects:

[0140] By setting the global protection circuit, the high voltage circuit and the filament circuit can be started only after the user actively enables, so that accidental starting or wrong operation is avoided, and the risk of accidents is reduced.

[0141] By setting the temperature sensor and the corresponding over-temperature protection circuit, over-temperature protection is realized.

[0142] The filament is powered by the direct current voltage obtained by rectifying the alternating voltage output by the second transformer of the filament circuit through the rectification module, so that the light source of the X-ray tube is more stable and smooth, and the thermal fatigue of the filament is reduced.

[0143] The silicon rubber is filled between the shell and the circuit board to form a protective layer to protect the internal electronic components and the circuit board, improve the insulation performance of the high-voltage power supply, prevent high-voltage breakdown short circuit, and prevent external factors such as moisture and dust from causing damage to the internal power supply;

[0144] Supports multiple communication methods, does not need manual configuration, has high transmission rate, wide compatibility, and strong anti-interference ability;

[0145] By setting corresponding protection modules in the high-voltage circuit and the filament circuit, the failure rate is reduced, the overall reliability of the system is improved, the equipment is ensured to operate in the best state, and the use efficiency and safety of the high-voltage power supply are improved.

[0146] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as exemplary and not restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and thus all changes falling within the meaning and range of equivalent elements of the claims are intended to be embraced in the present application. Any reference signs in the claims should not be considered as limiting the claims to which they relate.

[0147] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A high voltage power supply circuit for an X-ray tube, the X-ray tube comprising an anode and a filament, characterized in that, The high-voltage power supply circuit comprises a high-voltage circuit, a filament circuit, a control circuit, an over-temperature protection circuit and a global protection circuit; wherein, The high-voltage circuit is connected with an anode of an X-ray tube and is used for generating a target voltage signal; The filament circuit is connected with a filament of the X-ray tube and is used for generating a filament working voltage; The over-temperature protection circuit is connected with the control circuit and is used for generating an over-temperature protection signal based on the filament temperature; The control circuit is connected with the high-voltage circuit and the filament circuit and is used for generating an enable signal based on the over-temperature protection signal or an external control signal; The global protection circuit is connected with the control circuit, the high-voltage circuit and the filament circuit and is used for shutting down the high-voltage circuit and the filament circuit based on the enable signal; The global protection circuit comprises a first clamping unit, a second clamping unit and an enable control unit; wherein, The first clamping unit comprises a first amplifier and a first diode, the non-inverting input terminal of the first amplifier is connected with a reference potential, the inverting input terminal receives a first drive voltage or a second drive voltage, the output terminal is connected with the cathode of the first diode, and the anode of the first diode is connected with the high-voltage circuit; The second clamping unit comprises a second amplifier and a second diode, the non-inverting input terminal of the second amplifier is connected with a reference potential, the inverting input terminal receives a first drive voltage or a second drive voltage, the output terminal is connected with the cathode of the second diode, and the anode of the second diode is connected with the filament circuit; The enable control unit is connected with the first clamping unit and the second clamping unit and is connected with the control circuit to receive the enable signal, when the enable signal is at a first level, the enable control unit generates the first drive voltage, the first clamping unit shuts down the high-voltage circuit based on the first drive voltage, the second clamping unit shuts down the filament circuit based on the first drive voltage, when the enable signal is at a second level, the enable control unit generates the second drive voltage, the first clamping unit starts the high-voltage circuit based on the second drive voltage, and the second clamping unit starts the filament circuit based on the second drive voltage; The enable control unit comprises a first bipolar transistor and a switching diode; wherein, The control terminal of the first bipolar transistor is connected with the control circuit and receives the enable signal, the first terminal is connected with a reference potential, and the first terminal is directly or indirectly short-circuited with the control terminal, and the second terminal is connected with the third terminal of the switching diode; The first terminal of the switching diode is connected with the inverting input terminal of the first amplifier, the second terminal of the switching diode is connected with the inverting input terminal of the second amplifier, and the third terminal of the switching diode is directly or indirectly connected with the first power supply voltage.

2. The high voltage power supply circuit for an X-ray tube according to claim 1, characterized in that, The high-voltage circuit comprises a first oscillation module, a voltage doubling module, a tube voltage feedback acquisition module, a tube voltage adjustment module and a voltage limiting protection module; wherein, The first oscillation module is used for generating a first PWM signal; The voltage doubling module is connected with the first oscillation module and is used for generating a target voltage signal based on the first PWM signal and for sampling the target voltage signal to obtain a feedback voltage signal; The tube voltage feedback acquisition module is connected with the voltage doubling module and is used for generating a first voltage signal and a second voltage signal based on the feedback voltage signal; The tube voltage adjusting module is connected with the tube voltage feedback collecting module and the first oscillation module, and is configured to compare the second voltage signal with a first reference voltage signal and generate a first compensation signal, and the first oscillation module is configured to adjust the first PWM signal based on the first compensation signal; The voltage limiting protection module is connected with the tube voltage feedback collecting module and the tube voltage adjusting module, and is configured to generate a voltage limiting signal, and the tube voltage adjusting module is configured to adjust the first PWM signal based on the voltage limiting signal.

3. The high voltage power supply circuit for an X-ray tube according to claim 1, characterized in that, The filament circuit comprises a second oscillation module, a rectification module, a current feedback collecting module, a filament voltage adjusting module and a filament protection module; wherein, The second oscillation module is configured to generate a second PWM signal, and generate a first filament voltage based on the second PWM signal; The rectification module is connected with the second oscillation module, and is connected with the filament of the X-ray tube, and is configured to generate a second filament voltage based on the first filament voltage; The current feedback collecting module is connected with the rectification module, and is configured to generate a third voltage signal and a fourth voltage signal based on the second filament voltage respectively; The filament voltage adjusting module is connected with the current feedback collecting module and the second oscillation module, and is configured to generate a second comparison signal based on the fourth voltage signal, a second reference voltage signal and a third reference voltage signal, and the second oscillation module is configured to adjust the second PWM signal based on the second comparison signal; The filament protection module is connected with the second oscillation module, the rectification module and the control circuit, and is configured to generate a second shutdown signal based on the second filament voltage, the control circuit is configured to generate a first control signal based on the second shutdown signal, and the filament protection module is configured to shut down the second oscillation module based on the first control signal.

4. The high voltage power supply circuit for an X-ray tube according to claim 1, characterized in that, The first clamping unit further comprises a third diode, a cathode of the third diode is connected with an output end of the first amplifier, and an anode of the third diode is connected with the filament circuit.

5. The high voltage power supply for an X-ray tube according to claim 1, characterized in that, The over-temperature protection circuit comprises a first capacitor, a second capacitor, a first resistor, a second resistor and a third resistor; A first end of the first capacitor is connected with a reference potential, and a second end of the first capacitor is connected with a first end of the first resistor, a second end of the first resistor is connected with the control circuit through a connector; A first end of the second capacitor is connected with the reference potential, and a second end of the second capacitor is connected with a first end of the second resistor, a second end of the second resistor is connected with a first end of the third resistor, and a second end of the third resistor is connected with the control circuit through a connector.

6. A high voltage power supply for an X-ray tube, characterized in that The high-voltage power supply comprises a shell and a high-voltage power supply circuit arranged in the shell, the X-ray tube comprises an anode and a filament, the high-voltage power supply circuit comprises a high-voltage circuit, a filament circuit, a control circuit, an over-temperature protection circuit and a global protection circuit, the high-voltage power supply further comprises a temperature sensor arranged on a surface of the shell, and the temperature sensor is configured to collect a filament temperature and generate a first sensing signal representing the temperature; The high-voltage circuit is connected with the anode of the X-ray tube, and is configured to generate a target voltage signal; The filament circuit is connected with the filament of the X-ray tube, and is configured to generate a filament working voltage; The over-temperature protection circuit is connected with the control circuit, and is configured to generate an over-temperature protection signal based on the first sensing signal; The control circuit is connected with the high-voltage circuit and the filament circuit, and is configured to generate an enable signal based on the over-temperature protection signal or an external control signal; The global protection circuit is connected with the control circuit, the high-voltage circuit and the filament circuit, and is used for shutting down the high-voltage circuit and the filament circuit based on the enable signal.

7. The high-voltage power supply for an X-ray tube according to claim 6, characterized in that The shell is provided with a USB communication interface, an RS232 communication interface and a DC power input interface on one side. The USB communication interface, the RS232 communication interface and the DC power input interface are connected with the control circuit.

8. The high voltage power supply for an X-ray tube according to claim 6, characterized in that, The over-temperature protection circuit and part of the circuits in the high-voltage circuit are packaged in a first circuit board, and the rest of the circuits in the high-voltage circuit, the filament circuit, the control circuit and the global protection circuit are packaged in a second circuit board. The first circuit board and the second circuit board are arranged in the shell, and the first circuit board and the second circuit board are filled with silicone rubber between the inner surface of the shell.

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