High-pressure dose accuracy control system
By constructing a high-pressure dose accuracy control system and combining kV, mA, ms and temperature feedback signals, the problem of inaccurate high-pressure dose adjustment in microfocus X-ray equipment was solved, and high-precision high-pressure dose control was achieved.
Patent Information
- Application Number
- CN202520030342.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2035-01-07
AI Technical Summary
The high-pressure dose adjustment function of existing microfocus X-ray equipment is not reliable enough, resulting in a large deviation between the high-pressure dose and the standard value, making it impossible to achieve precise control.
The high-voltage dosage accuracy control system, composed of an AC input unit, a control unit, an inverter, a kV feedback unit, a mA feedback unit, a ms adjustment unit, a temperature feedback unit, and a high-voltage transformer, controls the inverter through multiple detection feedback signals to achieve precise control of the high-voltage dosage.
It achieves precise control of high-voltage dosage, ensuring that the deviations of kV, mA, and ms parameters are less than the requirements of national standards, thus meeting the high-precision requirements.
Smart Images
Figure CN223539131U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of power management technology, and specifically relates to a high-voltage dosage accuracy control system. Background Technology
[0002] Microfocus X-ray equipment and its accessories include a target and a target bombardment device using a target stream. Existing microfocus X-ray equipment also includes a device for adjusting the high-voltage dose, thereby allowing for regulation and control of the radiation energy emitted by the filament. High-voltage dose is a physical unit used to measure the "absorbed energy dose" (absorbed dose) caused by ionizing radiation; it describes the amount of ionizing radiation energy absorbed per unit mass of object. One gray (1 Gy) represents one joule of radiation energy absorbed per kilogram of matter. The high-voltage dose is related to three parameters of the high-voltage generator: - X-ray tube voltage, kV; - X-ray tube current, mA; - loading time, s and / or ms. National Standard GB9706.254 (Clause 203.6.4.3.104.4 / 5 / 6) requires that the deviation between the measured and indicated values of kV should not exceed 8%, the deviation between the measured and indicated values of mA should not exceed 20%, and the deviation between the measured and indicated values of ms should not exceed ±(10%+1ms). However, one drawback of known microfocus X-ray equipment is that the adjustment function it provides is not very reliable, which may result in a large deviation between the high pressure dose and the required standard value during use, making it impossible to achieve precise control. Summary of the Invention
[0003] In view of this, the purpose of this utility model is to provide a high-pressure dosage accuracy control system to solve the problems existing in the background art.
[0004] The objective of this utility model can be achieved through the following technical solution: A high-pressure dose accuracy control system, characterized in that it includes an AC input unit, a control unit, an inverter, a kV feedback unit, an mA feedback unit, a ms adjustment unit, a high-voltage transformer, and an X-ray generator. The AC input unit is connected to the power input terminal of the inverter; the signal output terminal of the control unit is connected to the control terminal of the inverter; the input terminal of the high-voltage transformer is connected to the power output terminal of the inverter; and the output terminal of the high-voltage transformer is connected to the X-ray generator. The kV feedback unit is connected to the signal input terminal of the control unit and is used to collect the kV value at the X-ray tube end of the X-ray generator, compare it with a preset kV value, and then feed it back to the control unit. The mA feedback unit is connected to the signal input terminal of the control unit and is used to collect the current value of the X-ray generator, compare it with a preset mA value, and then feed it back to the control unit. The ms adjustment unit is connected to the control unit and is used to control the loading time of the X-ray generator. The control unit outputs a corresponding PWM signal to control the inverter based on the signals sent by the kV feedback unit, the mA feedback unit, and the ms adjustment unit.
[0005] Preferably, the signal input terminal of the control unit is also connected to a temperature feedback unit. The temperature feedback unit is used to detect the ambient temperature of the filament of the X-ray generator and feed it back to the control unit. The control unit has a preset correspondence table between temperature and filament mA value. The control unit outputs a corresponding control signal to compensate the filament current value according to the temperature value fed back by the temperature feedback unit and the correspondence table.
[0006] Preferably, the temperature feedback unit is a temperature sensor, which is disposed inside the X-ray tube of the X-ray generator.
[0007] Preferably, the control unit is a PWM chip, the ms adjustment unit is a timer, and the timer is integrated in the control unit; the kV preset value and the mA preset value are both stored in the control unit.
[0008] Preferably, the kV feedback unit includes a voltage sensor and a first comparator, wherein the inverting input of the first comparator is connected to the voltage sensor, and the non-inverting input of the first comparator is connected to the control unit.
[0009] Preferably, the mA feedback unit includes a current sensor and a second comparator, the inverting input of the second comparator is connected to the current sensor, and the non-inverting input of the second comparator is connected to the control unit.
[0010] Compared with existing technologies, this invention utilizes multiple detection feedbacks of kV, mA, ms, and temperature of the X-ray generating device to achieve precise control of high-pressure dose, thereby enabling the equipment to provide accurate high-pressure dose and ensuring high-precision requirements. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the high-pressure dose accuracy control system in the embodiment.
[0012] Figure 2 This is a schematic diagram of the kV feedback unit in the embodiment.
[0013] Figure 3 This is a schematic diagram of the mA feedback unit in the embodiment. Detailed Implementation
[0014] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.
[0015] like Figure 1 As shown, this utility model provides a high-voltage dose accuracy control system, including an AC input unit, a control unit, an inverter, a kV feedback unit, an mA feedback unit, a ms adjustment unit, a temperature feedback unit, a high-voltage transformer, and an X-ray generator. The kV feedback unit, mA feedback unit, ms adjustment unit, and temperature feedback unit respectively detect the kV value, mA value, ms value, and temperature value of the X-ray generator, and are used as the control basis for the control unit to regulate the inverter.
[0016] In this system, the AC input unit is connected to the power input terminal of the inverter, the signal output terminal of the control unit is connected to the control terminal of the inverter, the input terminal of the high-voltage transformer is connected to the power output terminal of the inverter, and the output terminal of the high-voltage transformer is connected to the X-ray generator. The kV feedback unit is connected to the signal input terminal of the control unit. The kV feedback unit is used to collect the kV value at the X-ray tube end of the X-ray generator and compare it with the preset kV value before feeding it back to the control unit. The mA feedback unit is connected to the signal input terminal of the control unit. The mA feedback unit is used to collect the current value of the X-ray generator and compare it with the preset mA value before feeding it back to the control unit. The ms adjustment unit is connected to the control unit and is used to control the loading time of the X-ray generator. The temperature feedback unit is used to detect the ambient temperature of the filament of the X-ray generator and feed it back to the control unit. The control unit outputs corresponding PWM signals to control the inverter based on the signals sent by the kV feedback unit, mA feedback unit, ms adjustment unit, and temperature feedback unit.
[0017] Combination Figure 2 , 3Specifically, the control unit is a PWM chip. The kV feedback unit includes a voltage sensor and a first comparator. The inverting input of the first comparator is connected to the voltage sensor, and the non-inverting input is connected to the control unit. The preset kV value is stored in the control unit. The control unit compares the kV applied across the X-ray tube of the X-ray generator with the preset kV value using the first comparator to obtain the deviation of the kV value. This deviation is amplified by the first comparator and fed back to the control unit. The control unit adjusts the output PWM wave to control the duty cycle of the inverter so that the final output kV meets the requirement of a deviation of less than 8%.
[0018] Similarly, the mA feedback unit includes a current sensor and a second comparator. The inverting input of the second comparator is connected to the current sensor, and the non-inverting input is connected to the control unit. The preset mA value is also stored in the control unit. The actual mA value in the entire circuit is measured using the current value fed back from the current sensor. This actual mA value is compared with the preset mA value by the second comparator to obtain the deviation of the mA value. This deviation is amplified by the second comparator and fed back to the control unit as a current value. The control unit adjusts the output PWM wave to control the duty cycle of the inverter so that the final output mA meets the requirement of a deviation of less than 5%.
[0019] Because the filament resistance is affected by temperature, the voltage applied to the filament terminals needs adjustment in both cold and hot X-ray tube environments to ensure a stable filament current output. Therefore, in addition to mA feedback, a temperature feedback function is also incorporated. The control unit's signal input is connected to a temperature feedback unit. In this embodiment, the temperature feedback unit is a temperature sensor, which is installed inside the X-ray tube of the X-ray generator. The control unit has a pre-set table mapping temperature to filament mA values. Based on the temperature value fed back by the temperature feedback unit and the table, the control unit outputs a corresponding control signal to compensate for the filament current value, thereby achieving precise control of the X-ray tube's mA value.
[0020] In this embodiment, the ms adjustment unit is a timer, which can be integrated into the control unit. The timer allows for accurate control of the loading time, ensuring that the deviation of the measured ms value is less than ±(10%+1ms).
[0021] This invention combines kV feedback control, mA feedback control, temperature feedback control, and ms regulation functions, enabling the three parameters of the high-voltage generator to meet or even far exceed national standards, thereby achieving precise control of the high-voltage dose of the high-voltage generator.
[0022] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.
Claims
1. A high-pressure dosage accuracy control system, characterized in that, The system includes an AC input unit, a control unit, an inverter, a kV feedback unit, an mA feedback unit, a ms adjustment unit, a high-voltage transformer, and an X-ray generator. The AC input unit is connected to the power input terminal of the inverter. The signal output terminal of the control unit is connected to the control terminal of the inverter. The input terminal of the high-voltage transformer is connected to the power output terminal of the inverter, and the output terminal of the high-voltage transformer is connected to the X-ray generator. The kV feedback unit is connected to the signal input terminal of the control unit and is used to collect the kV value at the X-ray tube end of the X-ray generator, compare it with a preset kV value, and then feed it back to the control unit. The mA feedback unit is connected to the signal input terminal of the control unit and is used to collect the current value of the X-ray generator, compare it with a preset mA value, and then feed it back to the control unit. The ms adjustment unit is connected to the control unit and is used to control the loading time of the X-ray generator. The control unit outputs corresponding PWM signals to control the inverter based on the signals sent by the kV feedback unit, the mA feedback unit, and the ms adjustment unit.
2. The high-pressure dosage accuracy control system according to claim 1, characterized in that, The signal input terminal of the control unit is also connected to a temperature feedback unit. The temperature feedback unit is used to detect the ambient temperature of the filament of the X-ray generator and feed it back to the control unit. The control unit has a preset correspondence table between temperature and filament mA value. The control unit outputs a corresponding control signal to compensate the filament current value according to the temperature value fed back by the temperature feedback unit and the correspondence table.
3. The high-pressure dosage accuracy control system according to claim 2, characterized in that, The temperature feedback unit is a temperature sensor, which is installed inside the X-ray tube of the X-ray generator.
4. A high-pressure dosage accuracy control system according to claim 1, 2, or 3, characterized in that, The control unit is a PWM chip, the ms adjustment unit is a timer, and the timer is integrated in the control unit; the kV preset value and mA preset value are both stored in the control unit.
5. A high-pressure dosage accuracy control system according to claim 4, characterized in that, The kV feedback unit includes a voltage sensor and a first comparator. The inverting input of the first comparator is connected to the voltage sensor, and the non-inverting input of the first comparator is connected to the control unit.
6. A high-pressure dosage accuracy control system according to claim 4, characterized in that, The mA feedback unit includes a current sensor and a second comparator. The inverting input of the second comparator is connected to the current sensor, and the non-inverting input of the second comparator is connected to the control unit.