CN210840170U - X-ray bulb tube filament control circuit - Google Patents
X-ray bulb tube filament control circuit Download PDFInfo
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- CN210840170U CN210840170U CN201921460130.8U CN201921460130U CN210840170U CN 210840170 U CN210840170 U CN 210840170U CN 201921460130 U CN201921460130 U CN 201921460130U CN 210840170 U CN210840170 U CN 210840170U
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Abstract
The utility model discloses an X ray bulb filament control circuit, including the main control circuit that electric connection forms closed loop circuit in proper order, voltage regulation circuit and feedback sampling circuit. The main control circuit is used for receiving the current set value and outputting reference voltage to the voltage regulating circuit according to the current set value. The voltage regulating circuit regulates the actual filament voltage according to the received reference voltage, so that the actual filament voltage is equal to the reference voltage, and the actual filament voltage is converted into a feedback voltage signal through the feedback sampling circuit and is output to the main control circuit. According to the utility model discloses an X ray bulb lamp filament control circuit has closed loop feedback, can improve the control accuracy to bulb lamp filament electric current.
Description
Technical Field
The utility model relates to a filament control circuit, in particular to X ray bulb filament control circuit.
Background
The X-ray bulb tube is a main part for generating X-rays by an X-ray machine and consists of a bulb tube filament, an anode target and a vacuum glass tube. When the device works, the bulb tube filament needs to be heated to generate free electrons on the bulb tube filament, and then an electron beam is formed under the action of a high-voltage electric field to bombard an anode target surface and generate X rays. At present, the bulb tube filament power supply control of an X-ray machine is mostly open loop control, no real-time feedback exists, and the control precision is poor.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve one of the technical problem that exists among the prior art at least, provide an X-ray machine X ray bulb lamp filament control circuit, have closed loop feedback circuit, can improve control accuracy.
According to the utility model, a DC filament control circuit of an X-ray machine comprises a main control circuit, a voltage regulating circuit and a feedback sampling circuit which are electrically connected in sequence to form a closed loop circuit,
the main control circuit is used for receiving a current set value and outputting a reference voltage to the voltage regulating circuit according to the current set value,
the voltage regulating circuit regulates the actual filament voltage according to the received reference voltage, so that the actual filament voltage is equal to the reference voltage, and the actual filament voltage is converted into a feedback voltage signal through the feedback sampling circuit and is output to the main control circuit.
According to the utility model discloses real X-ray machine direct current filament control circuit has following beneficial effect, and feedback sampling circuit feeds back filament voltage to master control circuit, forms closed loop, can improve control accuracy.
The filament protection circuit comprises a first protection circuit, a voltage regulation circuit and a second protection circuit, wherein the first protection circuit is respectively connected with a first reference voltage and the voltage regulation circuit, the voltage regulation circuit outputs the actual filament voltage to the first protection circuit, and the first protection circuit outputs a voltage abnormal signal to the voltage regulation circuit according to the actual comparison result of the first reference voltage and the filament. The filament voltage is detected, and a voltage abnormal signal is sent to the voltage regulating circuit when the filament voltage is abnormal, so that the current limiting circuit stops working, and the filament is protected from being damaged.
The second protection circuit is connected with the output end of the main control circuit, and clamps the reference voltage when the reference voltage is too large. The abnormal reference voltage caused by the setting error of the filament current value or the abnormity of the main control circuit is prevented, the voltage is clamped in time when the abnormity occurs, the larger damage is prevented, and the protection is in time.
Furthermore, the main control circuit comprises an MCU, an MCU configuration circuit and a filament voltage setting circuit, the MCU is respectively connected with the MCU configuration circuit and the filament voltage setting circuit, and the reference voltage is output to the voltage regulating circuit through the filament voltage setting circuit. The filament voltage setting circuit can realize strong and weak current isolation and isolate the interference to other pins.
Furthermore, the MCU configuration circuit comprises a burning circuit, a reset circuit and a clock circuit which are independent of each other.
Furthermore, the voltage regulating circuit comprises an integrated voltage regulating circuit and an MOS (metal oxide semiconductor) tube, an OUTPUT (OUTPUT) pin of the integrated voltage regulating circuit is connected with a grid electrode of the MOS tube, a gating end of the MOS tube is used as an OUTPUT end of the voltage regulating circuit, and an IN + pin of the integrated voltage regulating circuit is used as an input end of the voltage regulating circuit.
Further, the first protection circuit is a voltage comparison circuit including a first operational amplifier, an inverting input terminal of the first operational amplifier is connected to the first reference voltage, a unidirectional input terminal of the first operational amplifier is connected to an output terminal of the voltage regulation circuit, the unidirectional input terminal of the first operational amplifier is further connected to a cathode of a TVS tube, and the output terminal of the first operational amplifier outputs the voltage abnormality signal to the voltage regulation circuit. The TVS tube can quickly reflect the overvoltage, and can clamp the voltage in case of overvoltage, thereby preventing larger damage.
Further, the second protection circuit is a voltage follower circuit including a second operational amplifier, a reverse input end of the second operational amplifier is connected with an output end of the second operational amplifier, a same-direction input end of the second operational amplifier is connected with a second reference voltage, an output end of the second operational amplifier is connected with an output end of the main control circuit through a diode, and an output end of the second operational amplifier is connected with a cathode of the diode.
Furthermore, the filament voltage setting circuit is a syntropy proportional amplification circuit comprising a third operational amplifier, the syntropy input end of the third operational amplifier is connected with a certain pin of the MCU, the reverse input end of the third operational amplifier is connected with the output end of the third operational amplifier, and the output end of the third operational amplifier is connected with the input end of the voltage regulating circuit.
Further, the output end of the first protection circuit is further connected with the main control circuit, and the first protection circuit outputs the voltage abnormal signal to the main control circuit.
Drawings
The present invention will be further described with reference to the accompanying drawings and examples;
fig. 1 is a connection block diagram of an embodiment of the present invention;
fig. 2 is a connection block diagram of another embodiment of the present invention;
fig. 3 is a schematic diagram of a main control circuit and a feedback sampling circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a voltage regulating circuit and a protection circuit according to an embodiment of the present invention;
fig. 5 is an overall schematic diagram of an embodiment of the present invention.
Detailed Description
This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
Referring to fig. 1, according to the utility model discloses an X ray bulb filament control circuit of embodiment includes master control circuit 10, voltage regulation circuit 20 and feedback sampling circuit 30, two liang interconnect between the three. The main control circuit 10 outputs a reference voltage to the voltage regulating circuit 20 according to a set filament current setting value, the voltage regulating circuit 20 outputs an actual filament voltage to the bulb filament and the feedback sampling circuit 30 according to the reference voltage, and the feedback sampling circuit 30 converts the filament voltage into a feedback voltage signal which can be received by the main control circuit 10 and feeds the feedback voltage signal back to the main control circuit 10. The main control circuit 10 includes a main control chip MCU100, a filament voltage setting circuit 101, and a plurality of MCU configuration circuits 102 required for maintaining the normal operation of the MCU100, wherein the filament voltage setting circuit 101 converts a control signal calculated by the MCU100 according to a filament current setting value and a feedback voltage signal provided by the feedback sampling circuit 30 into a reference voltage value, and transmits the reference voltage value to the voltage regulating circuit 20.
In addition, in other embodiments of the present invention, the X-ray tube filament control circuit may further include a plurality of protection circuits, as shown in fig. 2. In this embodiment, the X-ray tube filament control circuit further includes a first protection circuit 40 and a second protection circuit 50. The first protection circuit 40 is a protection circuit for monitoring the actual filament voltage, and when the actual filament voltage is higher than the first reference voltage, sends a voltage abnormal signal to the voltage regulation circuit 20 to limit the current and stop working, thereby protecting the bulb filament from being damaged. The second protection circuit 50 is a protection circuit for monitoring the value of the reference voltage, and when the reference voltage is too high, the second protection circuit 50 clamps the reference voltage to a safe value, so that the filament voltage output through the voltage regulation circuit 20 is within a safe threshold range.
Referring to fig. 3, a schematic diagram of the main control circuit 10 and the feedback sampling circuit 30 according to an embodiment of the present invention is shown. In this embodiment, the MCU100 is a 51-series single chip microcomputer, and it should be understood that the MCU100 may be other programmable controllers or microcomputers, such as an ARM, an FPGA or a DSP. In this embodiment, in order to maintain the normal operation of the MCU100, the MCU configuration circuit 102 includes a burning circuit 1021, a reset circuit 1022 and a clock circuit 1023. In the present embodiment, the filament voltage setting circuit 101 is a two-fold amplification circuit with a same-direction scaling, wherein the pin 3 of the third operational amplifier U2A is connected to the pin 100 of the MCU 100. The pin 2 of the third operational amplifier U2A is grounded through a resistor R3, and is also connected to the pin 1 of the output terminal thereof through a resistor R6, and the pin 1 thereof is connected to the input terminal of the voltage regulating circuit 20 to output the reference voltage. In this embodiment, the feedback sampling circuit 30 is a voltage dividing circuit composed of a resistor R22 and a resistor R23, the R24 starts a current limiting function, and the C20 starts a filtering function, so as to convert the actual filament voltage into a feedback voltage signal that can be received by the MCU. It is understood that the feedback sampling circuit 30 may also be a proportional amplifier circuit or other converting circuit that can convert a large voltage into a small voltage.
Referring to fig. 4, the voltage regulating circuit 20 and the first protection circuit 40 and the second protection circuit 50 according to the embodiment of the present invention are shown. In this embodiment, the voltage regulation circuit 20 employs an integrated voltage regulator U3, and preferably, the voltage regulator U3 selects UA723CD, which may be directly replaced by W723, FG723, LM723, MC723, CA723C, and the like. The voltage regulator integrates the functions of temperature compensation, error amplification, frequency compensation, current limitation and the like, and has the advantages of quick response and stable output. Its IN + pin is connected as an input terminal to the output terminal of the main control circuit 10, receives the reference voltage, and its IN-pin is connected to the filament voltage outputted therefrom, forming an internal closed loop circuit, so that the output of the integrated circuit more rapidly approaches to the reference voltage and is equal finally. The OUTPUT pin OUTPUT is connected with the bulb filament through an MOS tube, and DZ1, D3 and D4 are used for protecting U3 from being damaged by overvoltage. The CRR LIM pin is connected with the output of the first protection circuit 40, and when a voltage abnormal signal is received, the U3 can enter the current-limiting working turntable to limit the output of the current-limiting working turntable and protect the bulb filament.
In the present embodiment, the first protection circuit 40 is a voltage comparison circuit composed of a first operational amplifier U4, and its pin 1 is connected to the first reference voltage, and pin 2 is connected to the output terminal of the voltage regulation circuit 20 to receive the actual filament voltage. The first protection circuit 40 compares the actual filament voltage with the first reference voltage, and outputs a high level to the voltage regulator U3 through the pin 7 of the first operational amplifier U4 and limits the output when the actual filament voltage is higher than the first reference voltage, so as to protect the bulb filament. It is understood that, in this embodiment, the output of the first protection circuit 40 may also be connected to the MCU100 through an inverter to implement software alarm. The 2-pin of the first operational amplifier U4 is also connected to a TVS transistor V1 for clamping voltage and protecting the device. It is to be understood that a circuit that realizes a similar function of the first protection circuit 40 may be formed by a transistor and other switching devices, etc.
In this embodiment, the second protection circuit 50 is a unidirectional voltage follower circuit formed by the second operational amplifier U5B, the pin 5 of the third operational amplifier U5B is connected to the second reference voltage, the pin 6 connector thereof outputs pin 7, and the pin 7 thereof is connected to the output of the main control circuit 10 through an inverted diode D7 to receive the reference voltage. When the main control circuit 10 is abnormal or the artificially set reference filament current is too large, the second protection circuit 50 will clamp the reference voltage to a safe voltage value, so that the filament voltage clock output by the voltage regulation circuit is within a safe threshold. Compared with a voltage stabilizing diode, the voltage value clamped by the voltage clamping circuit can be adjusted by adjusting the resistance values of R20 and R21, so that the voltage clamping circuit is flexible and has strong load carrying capacity. It is understood that the second protection circuit 50 may also use a zener diode that is optionally configured.
According to the utility model discloses an X ray bulb lamp filament control circuit has the closed loop feedback, can improve the control accuracy to bulb lamp filament electric current, and has a plurality of protection circuit, and work is more stable.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (10)
1. A filament control circuit of an X-ray bulb tube is characterized by comprising a main control circuit, a voltage regulating circuit and a feedback sampling circuit which are electrically connected in sequence to form a closed loop circuit,
the main control circuit is used for receiving a current set value and outputting a reference voltage to the voltage regulating circuit according to the current set value,
the voltage regulating circuit regulates the actual filament voltage according to the received reference voltage, so that the actual filament voltage is equal to the reference voltage, and the actual filament voltage is converted into a feedback voltage signal through the feedback sampling circuit and is output to the main control circuit.
2. The filament control circuit of claim 1, further comprising a first protection circuit, wherein the first protection circuit is connected to a first reference voltage and the voltage regulation circuit, the voltage regulation circuit outputs the actual filament voltage to the first protection circuit, and the first protection circuit outputs a voltage abnormality signal to the voltage regulation circuit according to the actual comparison result between the first reference voltage and the filament.
3. The filament control circuit of an X-ray tube according to claim 1 or 2, further comprising a second protection circuit, wherein the second protection circuit is connected to the output terminal of the main control circuit, and when the reference voltage is too large, the second protection circuit clamps the reference voltage.
4. The filament control circuit of an X-ray tube of claim 1, wherein the main control circuit comprises an MCU, an MCU configuration circuit and a filament voltage setting circuit, the MCU is connected to the MCU configuration circuit and the filament voltage setting circuit, respectively, and the reference voltage is output to the voltage regulating circuit via the filament voltage setting circuit.
5. The filament control circuit of an X-ray tube according to claim 4, wherein the MCU configuration circuit comprises a burning circuit, a reset circuit and a clock circuit which are independent of each other.
6. The filament control circuit of an X-ray tube according to claim 1, wherein the voltage regulation circuit comprises an integrated voltage regulation circuit and an MOS transistor, the OUTPUT pin of the integrated voltage regulation circuit is connected to the gate of the MOS transistor, the gate of the MOS transistor serves as the OUTPUT terminal of the voltage regulation circuit, and the IN + pin of the integrated voltage regulation circuit serves as the input terminal of the voltage regulation circuit.
7. The filament control circuit of claim 2, wherein the first protection circuit is a voltage comparator circuit including a first operational amplifier, an inverting input of the first operational amplifier is connected to the first reference voltage, a non-inverting input of the first operational amplifier is connected to the output of the voltage regulator circuit, a non-inverting input of the first operational amplifier is further connected to a cathode of a TVS tube, and the output of the first operational amplifier outputs the voltage abnormality signal to the voltage regulator circuit.
8. The filament control circuit of claim 3, wherein the second protection circuit is a voltage follower circuit comprising a second operational amplifier, the inverting input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier, the non-inverting input terminal of the second operational amplifier is connected to a second reference voltage, the output terminal of the second operational amplifier is connected to the output terminal of the main control circuit through a diode, and the output terminal of the second operational amplifier is connected to the cathode of the diode.
9. The filament control circuit of claim 4, wherein the filament voltage setting circuit is a proportional amplifier circuit having a third operational amplifier, a common input terminal of the third operational amplifier is connected to a pin of the MCU, an inverting input terminal of the third operational amplifier is connected to an output terminal of the third operational amplifier, and an output terminal of the third operational amplifier is connected to an input terminal of the voltage regulating circuit.
10. The filament control circuit of claim 2, wherein the output terminal of the first protection circuit is further connected to the main control circuit, and the first protection circuit outputs the voltage abnormality signal to the main control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921460130.8U CN210840170U (en) | 2019-09-03 | 2019-09-03 | X-ray bulb tube filament control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921460130.8U CN210840170U (en) | 2019-09-03 | 2019-09-03 | X-ray bulb tube filament control circuit |
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| Publication Number | Publication Date |
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| CN210840170U true CN210840170U (en) | 2020-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921460130.8U Active CN210840170U (en) | 2019-09-03 | 2019-09-03 | X-ray bulb tube filament control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114666960A (en) * | 2022-03-28 | 2022-06-24 | 珠海市睿影科技有限公司 | X-ray machine high-voltage generator control circuit and X-ray machine |
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2019
- 2019-09-03 CN CN201921460130.8U patent/CN210840170U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114666960A (en) * | 2022-03-28 | 2022-06-24 | 珠海市睿影科技有限公司 | X-ray machine high-voltage generator control circuit and X-ray machine |
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