CN111787676A - Frequency conversion KV control system of medical diagnosis X-ray high-voltage generator - Google Patents
Frequency conversion KV control system of medical diagnosis X-ray high-voltage generator Download PDFInfo
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- CN111787676A CN111787676A CN202010729694.8A CN202010729694A CN111787676A CN 111787676 A CN111787676 A CN 111787676A CN 202010729694 A CN202010729694 A CN 202010729694A CN 111787676 A CN111787676 A CN 111787676A
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 title claims description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 238000001816 cooling Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000003574 free electron Substances 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 3
- 239000000306 component Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000002699 waste material Substances 0.000 description 3
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
- H05G1/08—Electrical details
- H05G1/26—Measuring, controlling or protecting
- H05G1/30—Controlling
- H05G1/46—Combined control of different quantities, e.g. exposure time as well as voltage or current
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4488—Means for cooling
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Abstract
The invention discloses a medical diagnosis X-ray high-voltage generator variable-frequency KV control system which comprises a control module, a processing module, a circuit module, a high-voltage generating circuit, an X-ray bulb tube, temperature feedback and current feedback, wherein the control module comprises manual control and PLC control, the circuit module comprises an inverter circuit, a control circuit and a filament heating circuit, the filament heating circuit and the high-voltage generating circuit jointly act on the X-ray bulb tube, the cooling module acts on the high-voltage generating circuit, the resonance circuit and the control circuit jointly act on the high-voltage generating circuit, and the control circuit is connected with the filament heating circuit. The variable-frequency KV control system of the high-voltage generator is simple in structure, safe, reliable, low in use cost, simple, feasible and easy to master, can effectively utilize energy to act in a circuit, realizes cooling of components through the cooling module, and prolongs service life.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to a frequency conversion KV control system of a medical diagnosis X-ray high-voltage generator.
Background
The high voltage generator is also called as a direct current high voltage generator, is a traditional name of a high voltage power supply, and is a high voltage power supply mainly used for insulation and leakage detection, and at present, the high voltage power supply and the high voltage generator are not strictly distinguished. The high-frequency direct-current high-voltage generator adopts a high-frequency voltage doubling circuit, applies the latest PWM high-frequency pulse width modulation technology, performs closed-loop adjustment, and adopts large voltage feedback, so that the voltage stability is greatly improved. The high-power IGBT device with excellent use performance and the driving technology thereof adopt measures such as special shielding, isolation, grounding and the like according to the electromagnetic compatibility theory. The high-voltage generator is one of the core components of DR, and is a device for changing power supply voltage and current into X-ray tube voltage tube current, and its quality is directly related to the safety of DR product and its whole service life, and its inversion frequency of high-frequency high-voltage generator is greater than 20 kHz. With the increase of the inversion frequency, the KV output of the high-voltage generator approaches to a constant straight line, the KV fluctuation is extremely small, the KV output can be generally displayed as a straight line in a waveform diagram, the waveform period is extremely short, and the controllable exposure shortest time is 1ms and is far lower than 3ms of the power frequency high-voltage generator. The high-voltage generator is the first choice of the existing high-voltage generator because of small size, light weight, low skin dosage, high imaging quality, large output dosage, real-time control, ultra-short time control and the like.
When the high voltage generator is in operation, the inverter is required to control the circuit to be turned on and off, along with the high frequency of the power electronic device, the miniaturization and high power density of the power electronic device become possible, however, if the switching mode is not changed, the switching frequency is simply increased, the switching loss of the device is increased, the efficiency is reduced, the heating is serious, the electromagnetic interference is increased, and the electromagnetic compatibility problem occurs, the rapidly developed resonant soft switching technology changes the switching mode of the device, the switching loss can be reduced to zero in principle, and the switching frequency can be increased without limitation, so that the resonant soft switching technology is an effective method for reducing the switching loss of the device and increasing the switching frequency, but in the actual switching process, a large amount of current can be caused to act on the device to cause the loss of the device, the overheating of the device is caused, the waste of the resource is also caused by the wasted electric quantity, and a frequency conversion KV control system of the medical, the current is guided and utilized to realize the cooling of the line.
Disclosure of Invention
The invention aims to solve the defects that a large amount of current acts on an element to cause element loss, the element is overheated, and the waste of resources is caused by the waste of electric quantity in the existing actual switching-on process, and the proposed medical diagnosis X-ray high-voltage generator variable-frequency KV control system guides and utilizes the current to realize the cooling of a line.
In order to achieve the purpose, the invention adopts the following technical scheme:
the frequency conversion KV control system for the medical diagnosis X-ray high-voltage generator comprises a control module, a processing module, a circuit module, a high-voltage generating circuit, an X-ray bulb tube, temperature feedback and current feedback, wherein the control module comprises manual control and PLC control, the circuit module comprises an inverter circuit, a control circuit and a filament heating circuit, the filament heating circuit and the high-voltage generating circuit jointly act on the X-ray bulb tube, the inverter circuit comprises a resonance circuit and a cooling module, the cooling module acts on the high-voltage generating circuit, the resonance circuit and the control circuit jointly act on the high-voltage generating circuit, the control circuit is connected with the filament heating circuit, the filament heating circuit is connected with the processing module through the temperature feedback, and the high-voltage generating circuit is connected with the processing module through the current feedback.
Preferably, the control module is controlled by hand as main control, the PLC is controlled by auxiliary control, the processing module converts the control module signal into a control signal which can be accepted by a component, and converts feedback signals of temperature feedback and current feedback into electric signals which can be accepted by the control module.
Preferably, the circuit module comprises an inverter circuit, a control circuit and a filament heating circuit, wherein the filament heating circuit directly acts on the X-ray bulb tube, and the filament heating circuit mainly reduces the low voltage (220V/380V) to the ultra-low voltage (12V) so as to supply power to the filament and heat the filament to generate free electrons.
Preferably, the control circuit controls the high voltage generating circuit and the filament heating circuit, and simultaneously controls the output voltage, the output filament current and the loading time.
Preferably, the inverter circuit includes a resonant circuit and a cooling module:
the internal elements of the resonance circuit comprise a resonance switch VT, a circuit power supply E, a resonance inductor L/, a resonance capacitor C/, a diode VD/, and the like;
the cooling module comprises parts such as a water storage cavity, a cooling circulating pipe and the like, and electronic elements such as a diode VD// and an electromagnetic cutting element K and the like.
Preferably, the high voltage generating circuit mainly boosts an alternating current low voltage (220V/380V) to a direct current high voltage (150 kV), supplies power to the X-ray bulb tube, and acts on the X-ray bulb tube together with the filament heating circuit.
Preferably, the cooling circulation pipe acts on components of the high voltage generation circuit.
Compared with the prior art, the invention has the beneficial effects that: the variable-frequency KV control system of the high-voltage generator is simple in structure, safe, reliable, low in use cost, simple, feasible and easy to master, can effectively utilize energy sources to act in the circuit, and can cool components through the cooling module, so that the service life is prolonged.
Drawings
Fig. 1 is a system framework diagram of a frequency conversion KV control system of a medical diagnosis X-ray high-voltage generator according to the present invention;
FIG. 2 is a schematic structural diagram of a middle resonant circuit of the variable frequency KV control system of the medical diagnostic X-ray high-voltage generator according to the present invention;
fig. 3 is a schematic structural diagram of a power consumption comparison diagram (resonant dc link circuit) of a hard switching mode (a) and a soft switching mode (b) in the variable frequency KV control system of the medical diagnostic X-ray high voltage generator according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-3, the medical diagnosis X-ray high-voltage generator frequency conversion KV control system comprises a control module, a processing module, a circuit module, a high-voltage generating circuit, an X-ray bulb tube, a temperature feedback, and a current feedback, wherein the control module comprises a manual control and a PLC control, the circuit module comprises an inverter circuit, a control circuit, and a filament heating circuit, the filament heating circuit and the high-voltage generating circuit jointly act on the X-ray bulb tube, the inverter circuit comprises a resonance circuit and a cooling module, the cooling module acts on the high-voltage generating circuit, the resonance circuit and the control circuit jointly act on the high-voltage generating circuit, the control circuit is connected with the filament heating circuit, the filament heating circuit is connected with the processing module through the temperature feedback, the high-voltage generating circuit is connected with the processing module through the current feedback, and the control circuit is mainly used for controlling the output voltage of the high, And filament current and loading time are output, and meanwhile, the filament current and the loading time are communicated with other X-ray equipment image chain components, so that the exposure accuracy is ensured. The application device circuit: besides supplying power to the X-ray tube, the high-voltage generator also has circuits for supplying power to other devices, such as a flat panel detector, a beam limiter and the like.
Furthermore, the control module is controlled by a manual mode as a main control mode, the PLC is controlled by an auxiliary control mode, the processing module converts signals of the control module into control signals which can be accepted by components, and converts feedback signals of temperature feedback and current feedback into electric signals which can be accepted by the control module.
Furthermore, the circuit module comprises an inverter circuit, a control circuit and a filament heating circuit, wherein the filament heating circuit directly acts on the X-ray bulb tube, and the filament heating circuit mainly reduces the low voltage (220V/380V) to the ultra-low voltage (12V) so as to supply power to the filament and heat the filament to generate free electrons; further, control circuit control high voltage generating circuit and filament heating circuit, control output voltage, output filament current and loading time simultaneously, furtherly, inverter circuit includes resonant circuit and cooling module: the internal elements of the resonance circuit comprise a resonance switch VT, a circuit power supply E, a resonance inductor L/, a resonance capacitor C/, a diode VD/, and the like; the cooling module comprises parts such as a water storage cavity, a cooling circulating pipe and the like, and electronic elements such as a diode VD// and an electromagnetic cutting element K and the like, and further, the cooling circulating pipe acts on each part of the high-voltage generating circuit: no matter DC-DC conversion or DC-AC conversion, the circuit works in a Pulse Width Modulation (PWM) mode, the device is in repeated and continuous switching-on and switching-off processes,
because the voltage it and the current it on the device exist at the same time in the switching process, the switching power loss occurs, when VT is turned off, the load current L is provided by the freewheeling diode VD, if VT is triggered to be switched on again, the current is transferred (converted) from the VD to the VT, and the current gradually drops in the period, so that the switching loss is generated; when the turn-on VT is stopped, it rises from zero, during which Ur = E is maintained until it decreases to zero, thus generating turn-off losses, by acting on the electromagnetic cutting element by the diverted current on the circuit, when the fluctuation of the linear current I has a clockwise moment on the circular current of the small needle N. The moment acts on electrons rotating around a core to enable the electrons to rotate clockwise, macroscopically, the north pole of a small magnetic needle N is perpendicular to a paper surface and is outward, a magnetic needle turntable arranged at an electromagnetic position is enabled to rotate to apply and consume current, the phenomenon that the current reflows to act on an element to cause the consumption of the element is avoided, the turntable drives a driving impeller arranged at the outer side of the turntable to rotate, liquid in a cooling circulating pipe flows through the rotation of the impeller, the driving of the water flow is further realized, the water flow in a water storage cavity flows in the pipe to act on a high-voltage generating circuit to effectively cool the element, the current is limited by a diode VD// and cannot reflow and can only be consumed, the influence of the current reflowing on the element is avoided during circulation, and the effective cooling of the element on the high-voltage generating circuit is met, the switching device VT is an ideal device, leads current to the electromagnetic cutting element K for consumption when being switched off, has no pipe voltage rise and drop when being switched on, has no loss when being switched on or switched off stably, and effectively cools the circuit by applying redundant current to the cooling module, thereby ensuring that the element operates in necessary environment.
Furthermore, the high voltage generating circuit mainly boosts the alternating current low voltage (220V/380V) to the direct current high voltage (150 kV) to supply power to the X-ray bulb tube, and the high voltage generating circuit and the filament heating circuit act on the X-ray bulb tube together.
The invention uses manual control as main control, PLC control as auxiliary control to form control module to operate, the processing module converts the electric signal of the control module into control signal which can be accepted by each component, and transmits the control signal to each component, so that the circuit module is started, the temperature reduction module in the inverter circuit reduces the temperature of the high voltage generation circuit, and the inverter circuit in the control circuit acts to control the high voltage generation circuit, the control circuit and the filament heating circuit, the filament heating circuit acts on the X-ray bulb tube directly, the filament heating circuit reduces the low voltage (220V/380V) to the ultra-low voltage (12V) to supply power to the filament, heats the filament to generate free electrons, the high voltage generation circuit increases the alternating low voltage (220V/380V) to the direct current high voltage (150 kV), the system circuit is mainly used for controlling the output voltage, the output filament current and the loading time of the high-voltage generator, simultaneously communicating with other X-ray equipment image chain components to ensure the exposure accuracy, and simultaneously communicating with other X-ray equipment image chain components to ensure the exposure accuracy.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The frequency conversion KV control system of the medical diagnosis X-ray high-voltage generator is characterized by comprising a control module, a processing module, a circuit module, a high-voltage generating circuit, an X-ray bulb tube, temperature feedback and current feedback, wherein the control module comprises manual control and PLC control, the circuit module comprises an inverter circuit, a control circuit and a filament heating circuit, the filament heating circuit and the high-voltage generating circuit jointly act on the X-ray bulb tube, the inverter circuit comprises a resonant circuit and a cooling module, the cooling module acts on the high-voltage generating circuit, the resonant circuit and the control circuit jointly act on the high-voltage generating circuit, the control circuit is connected with the filament heating circuit, the filament heating circuit is connected with the processing module through the temperature feedback, and the high-voltage generating circuit is connected with the processing module through the current feedback.
2. The medical diagnostic X-ray high voltage generator variable frequency KV control system of claim 1, wherein the control module is controlled by hand as a main control and PLC as an auxiliary control, and the processing module converts the control module signal into a control signal that can be accepted by the component and converts the feedback signal of temperature feedback and current feedback into an electrical signal that can be accepted by the control module.
3. The medical diagnostic X-ray high voltage generator variable frequency KV control system according to claim 1, wherein the circuit module comprises an inverter circuit, a control circuit and a filament heating circuit, the filament heating circuit directly acts on the X-ray bulb, the filament heating circuit mainly steps down a low voltage (220V/380V) to an ultra-low voltage (12V) to supply power to the filament, heating the filament to generate free electrons.
4. The medical diagnostic X-ray high voltage generator variable frequency KV control system of claim 1, wherein the control circuit controls the high voltage generating circuit and the filament heating circuit, and controls the output voltage, the output filament current and the loading time at the same time.
5. The medical diagnostic X-ray high-voltage generator variable-frequency KV control system as claimed in claim 1, wherein the inverter circuit comprises a resonant circuit and a cooling module:
the internal elements of the resonance circuit comprise a resonance switch VT, a circuit power supply E, a resonance inductor L/, a resonance capacitor C/, a diode VD/, and the like;
the cooling module comprises parts such as a water storage cavity, a cooling circulating pipe and the like, and electronic elements such as a diode VD// and an electromagnetic cutting element K and the like.
6. The medical diagnostic X-ray high voltage generator variable frequency KV control system of claim 1, wherein the high voltage generating circuit boosts an ac low voltage (220V/380V) to a dc high voltage (150 KV) to power the X-ray bulb, acting with the filament heating circuit on the X-ray bulb.
7. The medical diagnostic X-ray high voltage generator variable frequency KV control system of claim 5, wherein the cooling circulation tube acts on the components of the high voltage generating circuit.
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| CN202010729694.8A CN111787676A (en) | 2020-07-27 | 2020-07-27 | Frequency conversion KV control system of medical diagnosis X-ray high-voltage generator |
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| CN202010729694.8A CN111787676A (en) | 2020-07-27 | 2020-07-27 | Frequency conversion KV control system of medical diagnosis X-ray high-voltage generator |
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