CN116156721B - X-ray source adopting bipolar low-ripple high-precision controllable constant current source circuit - Google Patents
X-ray source adopting bipolar low-ripple high-precision controllable constant current source circuit Download PDFInfo
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- CN116156721B CN116156721B CN202310155264.3A CN202310155264A CN116156721B CN 116156721 B CN116156721 B CN 116156721B CN 202310155264 A CN202310155264 A CN 202310155264A CN 116156721 B CN116156721 B CN 116156721B
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- 238000001514 detection method Methods 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 7
- 230000003321 amplification Effects 0.000 claims description 27
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 27
- 230000001105 regulatory effect Effects 0.000 claims description 22
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 abstract description 5
- 239000003990 capacitor Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 230000000694 effects 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
- H05G1/10—Power supply arrangements for feeding the X-ray tube
- H05G1/12—Power supply arrangements for feeding the X-ray tube with dc or rectified single-phase ac or double-phase
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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
Abstract
The invention provides an X-ray source adopting a bipolar low-ripple high-precision controllable constant current source circuit, which comprises: the device comprises a power supply module, a transistor amplifying module, a control module, a current feedback module, a setting module, a current detection module, a first switch module and a second switch module. By arranging the current feedback module, the current output by the transistor amplifying module has the characteristics of low ripple, high precision, controllability and stability; by arranging the current detection module, the control module can accurately set the current value and the current direction of the magnetic focusing load of the X-ray source and play a role in protecting the magnetic focusing load of the X-ray source; through setting up first switch module and second switch module, can reduce the influence of current detection module to the load magnetic focusing coil's of X-ray source electric current, reduce the oscillation of control process and avoid load magnetic focusing coil to appear transshipping to control and drive structure is simpler, stable.
Description
Technical Field
The invention relates to the technical field of constant current source control, in particular to an X-ray source adopting a bipolar low-ripple high-precision controllable constant current source circuit.
Background
In recent years, the electronic industry has developed rapidly, and the use demands of bidirectional current executing devices, such as motors, fans and other loads, are all bidirectional current control devices, no matter in industry or civilian use. The controllable linear constant current source existing in the market is basically all a high-frequency switch power supply. The switching power supply has the advantages of high efficiency and small volume. However, the existing X-ray source has the following disadvantages:
1. because the power device needs to work in a high-frequency state, ripple noise interference is brought to the system, and the requirements of the rapidity and the stability of the load magnetic focusing coil of the X-ray source cannot be met.
2. The ripple noise can be effectively reduced by increasing the switching frequency, but the control and driving methods of discrete components are complex, and uncertainty is brought to design and debugging.
3. The current is directly output to the load magnetic focusing coil after the current is amplified by the transistor by the existing X-ray source, so that the oscillation time of the X-ray source is long and the load magnetic focusing coil is overloaded easily.
Disclosure of Invention
The invention aims to: aiming at the problems existing in the prior art, the invention provides an X-ray source adopting a bipolar low-ripple high-precision controllable constant current source circuit.
The technical scheme is as follows: the invention provides an X-ray source adopting a bipolar low-ripple high-precision controllable constant current source circuit, which comprises:
a power supply module configured to convert an ac input to a dc output;
a transistor amplification module configured to output a direct current output of the power supply module and a control signal of the control module as a smooth, controllable current to a magnetically focused load of the X-ray source;
the control module is configured to output a control signal to the transistor amplification module according to the current feedback signal output by the current feedback module and the setting signal output by the setting module;
a current feedback module configured to sample a current of a magnetic focus load of the X-ray source and output a current feedback signal;
and the setting module is configured to output a setting signal to the control module according to the input of the input panel so as to control the current of the magnetic focusing load of the X-ray source.
Further, the control module includes: a controller and a PI regulating circuit;
the controller is configured to receive a setting signal;
the PI regulation circuit is configured to output a control signal to the transistor amplification module according to a setting signal and a current feedback signal received by a controller.
Further, the X-ray source further comprises a current detection module;
the current detection module is used for detecting the direction and the current value of the output current of the transistor amplification module.
Further, the X-ray source also comprises a first switch module and a second switch module;
the controller is further configured to control the current detection module to detect the direction of the output current of the transistor amplification module by controlling the state of the first switch module;
the controller is further configured to control a connection state of the magnetic focus load of the X-ray source and the transistor amplification module by controlling a state of the second switching module.
Further, the control module further comprises an alarm module;
the alarm module is configured to send out a first alarm signal when the current direction detected by the current detection module is inconsistent with the current direction corresponding to the setting signal.
Further, the PI regulating circuit comprises a first operational amplifier circuit, and the current feedback module comprises a second operational amplifier circuit;
the power supply module is further configured to provide an operating voltage to the first operational amplifier circuit and the second operational amplifier circuit.
Further, the working process of the X-ray source comprises the following steps:
s1: the controller performs initialization setting: the controller controls the first switch module to be closed, and the controller controls the second switch module to be opened;
s2: the controller acquires a setting signal output by the input panel;
s3: the controller outputs a setting signal to the PI regulating circuit;
s4: the current detection module detects the direction of the output current of the transistor amplifying module and sends the direction to the controller;
s5: the controller compares the current direction detected by the current detection module with the current direction corresponding to the set signal; if the directions are consistent, entering S7; if the directions are inconsistent, entering S6;
s6: the controller controls the alarm module to send out a first alarm signal;
s7: the controller controls the first switch module to be opened, and the controller controls the second switch module to be closed; the current feedback module samples the current of the magnetic focusing load of the X-ray source and outputs a current feedback signal to the PI regulating circuit;
s8: the PI regulating circuit controls the output current direction and the output current value of the transistor amplifying module according to the setting signal and the current feedback signal.
Further, when the controller detects that the current direction corresponding to the setting signal is changed, the controller immediately performs the initialization setting.
Further, when the current detection module detects that the difference value between the current value output by the transistor amplification module and the current value corresponding to the set signal exceeds a preset value, the controller controls the alarm module to send out a second alarm signal.
Further, when the controller detects that the current value corresponding to the setting signal is larger than the maximum current value which can be output by the transistor amplifying module, the controller controls the first switch module to be switched off, the controller controls the second switch module to be switched off, and the controller controls the alarm module to send out a third alarm signal.
The technical effects are as follows: compared with the prior art, the invention has the following advantages: the X-ray source designed by the invention adopts a bipolar low-ripple high-precision controllable constant current source circuit, and the alternating current input is converted into direct current output through a power supply module; then the control module compares and analyzes the current feedback value of the load magnetic focusing coil of the X-ray source with the current value set by the setting module, realizes the control of the transistor amplifying module through the regulated control signal, finally realizes the control and regulation of the output current, ensures that the load magnetic focusing coil of the X-ray source needing to run positively and negatively can realize the positive and negative rotation control quickly and efficiently, improves the control efficiency and realizes the bidirectional control of the current; by arranging the current feedback module, the current output by the transistor amplifying module has the characteristics of low ripple, high precision, controllability and stability; by arranging the current detection module, the control module can accurately set the current value and the current direction of the magnetic focusing load of the X-ray source and play a role in protecting the magnetic focusing load of the X-ray source; through setting up first switch module and second switch module, can reduce the influence of current detection module to the load magnetic focusing coil's of X-ray source electric current, reduce the oscillation of control process and avoid load magnetic focusing coil to appear transshipping to control and drive structure is simpler, stable.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a block diagram of an X-ray source employing a bipolar low ripple high precision controllable constant current source circuit provided by an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of an X-ray source employing a bipolar low ripple high precision controllable constant current source circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a power module of an X-ray source using a bipolar low ripple high precision controllable constant current source circuit according to an embodiment of the present invention;
fig. 4 is a flowchart of an operation of an X-ray source using a bipolar low ripple high precision controllable constant current source circuit according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only one unit embodiment of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As an embodiment of the present invention, as shown in fig. 1 to 4, the present embodiment provides an X-ray source using a bipolar low ripple high precision controllable constant current source circuit, including:
a power supply module configured to convert an ac input to a dc output;
specifically, the power supply module is respectively connected with the transistor amplifying module, the control module and the current feedback module, converts alternating current input into positive and negative direct current signals, and provides direct current power supply voltages required by the transistor amplifying module, the control module and the current feedback module.
More specifically, as shown in fig. 3, the schematic diagram of the power supply module is that the ac power of the power grid is input to the transformer, the ac power is stepped down and stepped up by the input transformer and then flows to the rectifier bridge, the dc power is output by the rectifier bridge and then flows through the large electrolytic capacitors C3 and C5, and finally stable and constant positive and negative dc power supplies va+ and VA-, are obtained and supplied to the following transistor amplifying modules. Positive and negative direct current power supplies VA+ and VA-respectively flow through LDO chips U3 and U4 through current limiting resistors R22 and R23, and VCC+ and VCC-for supplying power to a later control module and a current feedback module are obtained through filtering of capacitors C4 and C6.
A transistor amplification module configured to output a current to a magnetic focus load of the X-ray source from a direct current output of the power supply module and a control signal of the control module;
the control module is configured to output a control signal to the transistor amplification module according to the current feedback signal output by the current feedback module and the setting signal output by the setting module;
a current feedback module configured to sample a current of a magnetic focus load of the X-ray source and output a current feedback signal;
and the setting module is configured to output a setting signal to the control module according to the input of the input panel so as to control the current of the magnetic focusing load of the X-ray source.
Further, the control module includes: a controller and a PI regulating circuit;
the controller is configured to receive a setting signal;
specifically, the controller has an output pin 1, an input pin 2, an output pin 3, an output pin 4, and an input pin 5.
The PI regulation circuit is configured to output a control signal to the transistor amplification module according to a setting signal and a current feedback signal received by a controller.
Specifically, as shown in fig. 2, the schematic diagram of the PI adjusting circuit is shown, where the PI adjusting circuit includes resistors R8 and R9, capacitors C1 and C2, and a first op-amp circuit U1, a second end of the resistor R8 is connected to a first end of the capacitor C1, a first end of the capacitor C2, and a reverse input end of the U1, a second end of the capacitor C2 is connected to the first end of the resistor R9, and a second end of the capacitor C1 is connected to a second end of the resistor R9, and an output end of the U1.
Further, the X-ray source further comprises a current detection module;
the current detection module is used for detecting the direction and the current value of the output current of the transistor amplification module.
Specifically, the current detection module adopts a current transformer, and the current detection module sends a current detection signal to the input pin 5 of the controller.
Further, the X-ray source also comprises a first switch module and a second switch module;
the controller is further configured to control the current detection module to detect the direction of the output current of the transistor amplification module by controlling the state of the first switch module;
specifically, the first switch module adopts the relay K1, and the controller controls the relay K1 through the output pin 4.
The controller is further configured to control a connection state of the magnetic focus load of the X-ray source and the transistor amplification module by controlling a state of the second switching module.
Specifically, the second switch module adopts a relay K2, and the controller controls the relay K2 through the output pin 1.
Further, the control module further comprises an alarm module;
the alarm module is configured to send out a first alarm signal when the current direction detected by the current detection module is inconsistent with the current direction corresponding to the setting signal.
Specifically, the alarm module is provided with a loudspeaker and a display, wherein the loudspeaker sends out corresponding alarm sound according to the type of the alarm signal, and meanwhile, the display displays corresponding alarm information according to the type of the alarm signal.
Further, the PI regulating circuit comprises a first operational amplifier circuit U1, and the current feedback module comprises a second operational amplifier circuit U2;
the power supply module is further configured to provide an operating voltage to the first operational amplifier circuit U1 and the second operational amplifier circuit U2.
Specifically, the power supply module supplies the operating voltages vcc+ and VCC-to the first and second operational circuits U1 and U2.
Further, as shown in fig. 4, the operation of the X-ray source includes the steps of:
s1: the controller performs initialization setting: the controller controls the first switch module to be closed, and the controller controls the second switch module to be opened;
s2: the controller acquires a setting signal output by the input panel;
s3: the controller outputs a setting signal to the PI regulating circuit;
s4: the current detection module detects the direction of the output current of the transistor amplifying module and sends the direction to the controller;
s5: the controller compares the current direction detected by the current detection module with the current direction corresponding to the set signal; if the directions are consistent, entering S7; if the directions are inconsistent, entering S6;
s6: the controller controls the alarm module to send out a first alarm signal;
s7: the controller controls the first switch module to be opened, and the controller controls the second switch module to be closed; the current feedback module samples the current of the magnetic focusing load of the X-ray source and outputs a current feedback signal to the PI regulating circuit;
s8: the PI regulating circuit controls the output current direction and the output current value of the transistor amplifying module according to the setting signal and the current feedback signal.
Specifically, the purpose of step S1 is to connect the current detection module with the transistor amplification module, disconnect the magnetic focusing load of the X-ray source from the transistor amplification module, set the resistance value of the test resistor R6 equal to the resistance value of the magnetic focusing load R10 of the X-ray source, so that the current value and the current direction output by the transistor amplification module can be detected first, and protect the magnetic focusing load of the X-ray source. After step S7, the controller controls the first switch module to be opened, and the controller controls the second switch module to be closed, which aims to confirm that the current direction detected by the current detection module is consistent with the current direction corresponding to the set signal, firstly disconnect the connection between the current detection module and the transistor amplification module, then connect the magnetic focusing load of the X-ray source with the transistor amplification module, reduce the influence of the current detection module on the magnetic focusing load current of the X-ray source, and improve the accuracy of the X-ray source.
Further, when the controller detects that the current direction corresponding to the setting signal is changed, the controller immediately performs the initialization setting.
Specifically, when the setting signal output by the setting module is switched to the current direction, the controller immediately executes initialization setting, namely, the controller controls the first switch module to be closed, and the controller controls the second switch module to be opened.
Further, when the current detection module detects that the difference value between the current value output by the transistor amplification module and the current value corresponding to the set signal exceeds a preset value, the controller controls the alarm module to send out a second alarm signal.
Specifically, when the current detection module detects that the difference value between the current value output by the transistor amplification module and the current value corresponding to the set signal exceeds a preset value, the transistor amplification module is indicated to have a fault, and the controller controls the alarm module to send out a second alarm signal. If the current exceeding the preset value is directly output to the X-ray source, the control system can cause serious oscillation phenomenon; only the difference value is within the preset value range, the system can be quickly stabilized, and the step can shorten the adjustment time of the system.
Further, when the controller detects that the current value corresponding to the setting signal is larger than the maximum current value which can be output by the transistor amplifying module, the controller controls the first switch module to be switched off, the controller controls the second switch module to be switched off, and the controller controls the alarm module to send out a third alarm signal.
Specifically, when the controller detects that the current value corresponding to the setting signal is greater than the maximum current value which can be output by the transistor amplifying module, the transistor amplifying module is indicated to have a fault, if the current detecting module does not detect the current, the transistor amplifying module directly outputs the current to the X-ray source, so that the magnetic focusing load of the X-ray source is overloaded, the controller controls the first switch module to be disconnected, the controller controls the second switch module to be disconnected, the overload of the magnetic focusing load of the X-ray source is avoided, and the magnetic focusing load of the X-ray source is protected.
Preferably, with reference to fig. 1 to 4, the specific working process of the X-ray source using the bipolar low-ripple high-precision controllable constant current source circuit provided in this embodiment is as follows:
the input panel of the setting module outputs the voltage Vi1 to the input pin 2 of the controller, and the output pin 3 of the controller outputs the voltage Vi2, vi1=vi2, i.e., the input pin 2 and the output pin 3 have the function of a voltage follower.
Vi2 is then coupled to the inverting input of U1 via R8, and the subsequent current feedback signal Vo3 is coupled to the non-inverting input of U1, and C1, R9, C2 form a PI regulation circuit. A voltage Vb is output by a PI regulating circuit and flows into a following transistor amplifying module, and the PI regulating circuit can improve the steady-state performance of an X-ray source.
The transistor amplifying module outputs a current Io to flow through a magnetic focusing load R10 of the X-ray source and the four-wire sampling resistor R11 to generate voltages Vo1 and Vo2, wherein Vo 1-vo2=io×rs, and then the voltage Vo3 is outputted by the differential amplifier formed by the resistors R16, R17, R20, R21 and U2 and the voltage Vi2 outputted by the previous controller form closed loop regulation, so that the difference of output currents is controlled.
The current Io flowing through the load R10 and the four-wire sampling resistor R11 from left to right is defined as positive, and the current Io flowing through the load R10 and the four-wire sampling resistor R11 from right to left is defined as negative.
When the input panel outputs a positive voltage, both Vi1 and Vi2 are positive. The reverse input terminal of U1 is connected through R8, the positive input terminal has no voltage, then a PI regulating circuit is formed by C1, R9, C2 and U1 to output a voltage Vb, when the value of Vb is negative, when the output of U1 is smaller than-0.7V, the transistor Q4 enters the amplifying region, the base current Iq4_b of the transistor Q4 is Iq4_b= (1.4V-Vb)/R12, because the collector current is equal to beta times of the base current, iq4_c=beta.Iq4_b, the voltage drop on the resistor R18 is beta.Iq4_b.R18, when the voltage value of Vb is known to be larger, the voltage drop on the resistor R18 is larger, the absolute value of Vb2 is smaller, then, the base current of Q6 is obtained from the base current Iq 6_b= ((va+) -Vb 2)/(r15+r19), the base current of Q6 is increased because the collector current is equal to β times the base current, so the collector current of Q6 is also increased, the voltage drop on R13 is increased to cause the absolute value of the base voltage Vb4 of Q5 to be increased and the base current to be increased, then the output current Io of Q5 is increased, and the output current Io of Q5 flows from left to right through the load R10 and the four-wire sampling resistor R11 to generate voltages Vo1 and Vo2, where Vo 1-vo2=io=rs, and where r16=r17, r20=r21, vo1 and Vo2 are calculated by virtual shortening and breaking of U2, where vo3=r21/r17 (Vo 1-Vo 2), and where vo3=r21/r17 (Io 11) is calculated by virtual shortening and virtual breaking of U2. Finally Vo3 and the voltage Vi2 output by the previous control module form closed-loop regulation and always circulate, so as to control the difference of output currents.
Similarly, when the input panel outputs a negative voltage, both Vi1 and Vi2 are negative. The positive input terminal of U1 is connected through R8, no voltage is present at the positive input terminal, then a PI regulating circuit is formed by C1, R9, C2 and U4 to output a voltage Vb, the value of Vb is positive, the transistor Q3 enters the amplifying region when the operational amplifier output Vb is greater than 0.7V, the base current Iq3_b of the transistor Q3 is Iq 3_b= ((Vb-) -1.4V)/R7, because the collector current is equal to β times the base current, iq 3_c=β times Iq3_b, then the voltage drop over the resistor R2 is β times Iq3_b R2, at this time, the positive voltage drop over the resistor R2 is known from the voltage value of Vb, the absolute value of Vb is thus smaller, then the base current Iq 1_b= (Vb-) (R1+r3) is obtained from the base current Iq1, and the voltage drop over the resistor Q1 is also larger than the voltage of the resistor R1, and the voltage drop over the resistor R2 is calculated from the resistor R1, and the voltage drop over the resistor R1, R2 is known from the voltage value of the resistor R1, R2 is larger, and the voltage drop over the resistor R2 is calculated from the resistor R1 = V1, the voltage drop over the resistor R2 = V is larger, and the voltage drop over the resistor is calculated from the resistor R1 = 11 to the voltage over the resistor R2, and the voltage is larger. Finally Vo3 and the voltage Vi2 output by the previous control module form closed-loop regulation and always circulate, so as to control the difference of output currents.
Through the design of the circuit, the current output by the transistor amplifying module has the characteristics of low ripple, high precision, controllability and stability.
The X-ray source designed by the invention adopts a bipolar low-ripple high-precision controllable constant current source circuit, and the alternating current input is converted into direct current output through a power supply module; then the control module compares and analyzes the current feedback value of the load magnetic focusing coil of the X-ray source with the current value set by the setting module, realizes the control of the transistor amplifying module through the regulated control signal, finally realizes the control and regulation of the output current, ensures that the load magnetic focusing coil of the X-ray source needing to run positively and negatively can realize the positive and negative rotation control quickly and efficiently, improves the control efficiency and realizes the bidirectional control of the current; by arranging the current feedback module, the current output by the transistor amplifying module has the characteristics of low ripple, high precision, controllability and stability; by arranging the current detection module, the control module can accurately set the current value and the current direction of the magnetic focusing load of the X-ray source and play a role in protecting the magnetic focusing load of the X-ray source; through setting up first switch module and second switch module, can reduce the influence of current detection module to the load magnetic focusing coil's of X-ray source electric current, reduce the oscillation of control process and avoid load magnetic focusing coil to appear transshipping to control and drive structure is simpler, stable.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (5)
1. An X-ray source adopting a bipolar low-ripple high-precision controllable constant current source circuit,
characterized by comprising the following steps:
a power supply module configured to convert an ac input to a dc output;
a transistor amplification module configured to output a direct current output of the power supply module and a control signal of the control module as a smooth, controllable current to a magnetically focused load of the X-ray source;
the control module is configured to output a control signal to the transistor amplification module according to the current feedback signal output by the current feedback module and the setting signal output by the setting module;
a current feedback module configured to sample a current of a magnetic focus load of the X-ray source and output a current feedback signal;
the setting module is configured to output a setting signal to the control module according to the input of the input panel, so as to control the current of the magnetic focusing load of the X-ray source;
the control module includes: a controller and a PI regulating circuit;
the controller is configured to receive a setting signal;
the PI regulating circuit is configured to output a control signal to the transistor amplifying module according to a setting signal and a current feedback signal received by the controller;
the X-ray source also comprises a current detection module;
the current detection module is used for detecting the direction and the current value of the output current of the transistor amplification module;
the X-ray source also comprises a first switch module and a second switch module;
the controller is further configured to control the current detection module to detect the direction of the output current of the transistor amplification module by controlling the state of the first switch module;
the controller is further configured to control a connection state of the magnetic focus load of the X-ray source and the transistor amplification module by controlling a state of the second switching module;
the control module further comprises an alarm module;
the alarm module is configured to send out a first alarm signal when the current direction detected by the current detection module is inconsistent with the current direction corresponding to the set signal;
the PI regulating circuit comprises a first operational amplifier circuit, and the current feedback module comprises a second operational amplifier circuit;
the power supply module is further configured to provide an operating voltage to the first operational amplifier circuit and the second operational amplifier circuit.
2. The X-ray source of claim 1, wherein: the working process of the X-ray source comprises the following steps:
s1: the controller performs initialization setting: the controller controls the first switch module to be closed, and the controller controls the second switch module to be opened;
s2: the controller acquires a setting signal output by the input panel;
s3: the controller outputs a setting signal to the PI regulating circuit;
s4: the current detection module detects the direction of the output current of the transistor amplifying module and sends the direction to the controller;
s5: the controller compares the current direction detected by the current detection module with the current direction corresponding to the set signal; if the directions are consistent, entering S7; if the directions are inconsistent, entering S6;
s6: the controller controls the alarm module to send out a first alarm signal;
s7: the controller controls the first switch module to be opened, and the controller controls the second switch module to be closed; the current feedback module samples the current of the magnetic focusing load of the X-ray source and outputs a current feedback signal to the PI regulating circuit;
s8: the PI regulating circuit controls the output current direction and the output current value of the transistor amplifying module according to the setting signal and the current feedback signal.
3. The X-ray source of claim 2, wherein:
when the controller detects that the current direction corresponding to the setting signal changes, the controller immediately executes initialization setting.
4. An X-ray source according to claim 3, characterized in that:
when the current detection module detects that the difference value between the current value output by the transistor amplification module and the current value corresponding to the set signal exceeds a preset value, the controller controls the alarm module to send out a second alarm signal.
5. The X-ray source of claim 4, wherein:
when the controller detects that the current value corresponding to the setting signal is larger than the maximum current value which can be output by the transistor amplifying module, the controller controls the first switch module to be disconnected, the controller controls the second switch module to be disconnected, and the controller controls the alarm module to send out a third alarm signal.
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| CN202310155264.3A CN116156721B (en) | 2023-02-23 | 2023-02-23 | X-ray source adopting bipolar low-ripple high-precision controllable constant current source circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116156721A (en) | 2023-05-23 |
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