Current detection device, control method, and vascular calcification treatment apparatus

Abstract

The application discloses a current detection device, a control method and a blood vessel calcification treatment equipment. The current detection device comprises a current detection module, a processing module and a control module. The current detection module is arranged in a high-voltage discharge loop. The current detection module is used for detecting the currents of a first branch and a second branch of the high-voltage discharge loop to obtain a first current signal and a second current signal respectively. The processing module is coupled with the current detection module. When the current difference between the first current signal and the second current signal is not within an allowable range, the processing module generates a discharge abnormality prompt signal. The control module is connected with the processing module and the current detection module. When the control module receives the discharge abnormality prompt signal sent by the processing module, the control module sends a pulse signal to disconnect the first branch and the second branch. The application can be used for avoiding the serious unevenness of the currents of the parallel first branch and the second branch in the high-voltage discharge loop, and can improve the stability of the system and the safety of the equipment.

Description

Technical Field

[0001] This invention relates to the field of electronic circuit technology, and in particular to a current detection device, a control method, and a device for treating vascular calcification. Background Technology

[0002] Vascular calcification is a common pathological manifestation in atherosclerosis, hypertension, diabetic vascular complications, vascular injury, chronic kidney disease, and aging. It mainly manifests as increased stiffness and decreased compliance of the blood vessel walls, easily leading to myocardial ischemia, left ventricular hypertrophy, and heart failure, triggering thrombosis and plaque rupture. It is a significant factor contributing to the high incidence and mortality of cardiovascular and cerebrovascular diseases; it is also an important biomarker for atherosclerotic cardiovascular events, stroke, and peripheral vascular disease.

[0003] For vascular calcification lesions, commonly used clinical treatments include non-compliant balloons, cutting balloons, rotational atherectomy, and excimer laser therapy. However, these treatments are only suitable for mild to moderate calcification lesions and are difficult to treat deep calcification lesions. Shockwave lithotripsy, as an emerging technology, combines traditional electrohydraulic lithotripsy and balloon angioplasty, and can efficiently and safely perform pretreatment for moderate to severe calcification lesions of the coronary or peripheral arteries. It ruptures calcified plaques without damaging the vascular intima, and can achieve good treatment results for calcified nodules, eccentric calcifications, and superficial and deep calcification lesions.

[0004] The shockwave energy system based on electrohydraulic lithotripsy and balloon angioplasty comprises a shockwave generator, a connector, and a shockwave catheter. The shockwave generator produces the high-voltage pulse signal required for treatment. The connector connects the shockwave generator and the shockwave catheter, transmitting the pulse signal. Upon reaching the shockwave catheter, the high-voltage pulse signal acts on the conductive medium inside the catheter balloon, causing breakdown and generating a shockwave. Under the pressure of the shockwave and the tension of the calcified blood vessel itself, the calcification is broken up. The shockwave generator operates on the principle of high voltage, high current, and instantaneous discharge. During the process, a high-energy-density, high-voltage, high-temperature plasma region appears in the discharge channel, converting electrical energy into acoustic, light, mechanical, and thermal energy. Simultaneously, the entire discharge channel expands rapidly, forming a pressure pulse in the liquid medium, thus creating the shockwave.

[0005] The rapid release of high-voltage energy within a short period makes precise and rapid control of the shock wave energy crucial. To obtain greater pulse power, the system requires high voltage or a large pulse current. Therefore, a suitable high-voltage or high-current DC switch is needed in the circuit to perform high-voltage isolation and high-current path interruption. IGBT (Insulated Gate Bipolar Transistor) switching elements are fully controlled field-effect transistor devices with very low turn-on and turn-off losses. They have mature applications in various fields, and their switching action time is on the order of microseconds or even nanoseconds, making them the best choice for high-current DC switching applications with strict requirements for turn-on and turn-off times. However, due to the inherent performance of the semiconductor power devices and materials that make up the IGBT module, the output current of a single IGBT cannot meet the current requirements of the shock wave equipment. The IGBT will withstand extremely large surge currents and voltage spikes during turn-on and turn-off, inevitably leading to increased IGBT power consumption, module overheating, and in severe cases, device failure or even damage to the main circuit. In practical applications, to carry higher output currents, IGBTs are usually used in parallel. This not only provides the required current but also forms a redundant structure, improving system stability.

[0006] However, when IGBTs are operated in parallel, the dispersion of parameters among the modules means that their output currents cannot be exactly the same, leading to some modules being overloaded while others are underloaded. This reduces system stability and may have serious consequences for system operation, as well as significantly shortening the lifespan of the IGBT modules themselves. Therefore, the current in each IGBT branch needs to be considered when using them in parallel. In shock wave therapy equipment, the high-voltage discharge time is short and the discharge current is large, which puts a tremendous strain on the IGBTs. If the current in the IGBT branches is uneven, it can accelerate the aging of the IGBT modules, greatly shortening their lifespan and the lifespan of the shock wave equipment. In severe cases, the severely uneven current in the IGBT branches can cause the IGBT modules to fail and be damaged, resulting in abnormal discharge and equipment damage.

[0007] Shockwave therapy for endovascular calcification is based on the principles of electrohydraulic effects and balloon angioplasty. High-voltage energy is rapidly released in the liquid channel, generating a massive current in the high-voltage discharge circuit. Due to the outstanding performance of IGBTs in turn-on and turn-off times and high-current DC applications, IGBTs are generally used for circuit control. However, a single IGBT cannot handle the large current generated during discharge. Therefore, IGBTs are typically used in parallel to improve their load current handling capacity. However, in parallel operation, the dispersion of parameters among the modules means that the output current cannot be completely uniform. Some IGBT modules are overloaded, while others are underloaded, reducing system stability and significantly shortening the lifespan of the IGBTs themselves. Current shockwave therapy equipment generally lacks current sharing detection and control for parallel IGBT modules, making it impossible to know the current distribution in each branch. If an IGBT branch experiences overcurrent, it will overload a single IGBT, significantly reducing its lifespan over time and impacting the overall lifespan of the equipment. Severe overcurrent in an IGBT branch will cause IGBT failure or damage, resulting in equipment failure and preventing further treatment of the patient. Summary of the Invention

[0008] In view of this, the purpose of the present invention is to provide a current detection device, a control method, and a vascular calcification treatment device to solve the problem of severe uneven branch current in the prior art, which causes abnormal device discharge and device damage.

[0009] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0010] In a first aspect, embodiments of the present invention disclose a current detection device, the current detection device comprising:

[0011] A current detection module is installed in the high-voltage discharge circuit. The current detection module is used to detect the current in the first branch and the second branch of the high-voltage discharge circuit to obtain the first current signal and the second current signal respectively.

[0012] The processing module, coupled to the current detection module, generates a discharge abnormality warning signal when the current difference between the first current signal and the second current signal is not within the allowable range.

[0013] The control module, connected to the processing module and the current detection module, is used to send a pulse signal to disconnect the first branch and the second branch when it receives the discharge abnormality warning signal sent by the processing module.

[0014] In one embodiment, the current detection device includes a differential amplifier circuit connected between the current detection module and the processing module, which differentially amplifies the first current signal and the second current signal.

[0015] In one embodiment, the current detection module includes:

[0016] The first PCB Rogowski coil generates a first coil output voltage based on the first current signal;

[0017] The second PCB Rogowski coil generates a second coil output voltage based on the second current signal;

[0018] Specifically, the difference between the output voltage of the first coil and the output voltage of the second coil is used to determine whether the current difference between the first current signal and the second current signal is within the allowable range.

[0019] In one embodiment, the current detection device further includes:

[0020] The resistor under test has its first end connected to the first end of the first PCB Rogowski coil, and its second end connected to the first end of the second PCB Rogowski coil. The potential difference between the two ends of the resistor under test is a value. The second end of the first PCB Rogowski coil is connected to the second end of the second PCB Rogowski coil, and the winding directions of the first PCB Rogowski coil and the second PCB Rogowski coil are opposite, so that the output voltages of the first coil and the second coil are in opposite directions.

[0021] The control module transmits the pulse signal to the control terminal of the second switching element and the control terminal of the first switching element through the fourth resistor and the fifth resistor, respectively; wherein, the first switching element is disposed in the first branch, and the first terminal of the first switching element receives the first current signal through the first current sharing resistor; the second switching element is disposed in the second branch, and the first terminal of the second switching element receives the second current signal through the second current sharing resistor; the second terminals of the first switching element and the second terminal of the second switching element are both connected to the third resistor.

[0022] Wherein, when the current difference between the first current signal and the second current signal is not within the allowable range, the pulse signal sent by the control module is used to disconnect the first switching element and the second switching element;

[0023] When the current difference between the first current signal and the second current signal is within the allowable range, the pulse signal sent by the control module after a preset time is used to disconnect the first switching element and the second switching element.

[0024] When the current value of the first current signal is the same as the current value of the second current signal, the output voltage of the first coil and the output voltage of the second coil are the same, and the current flowing through the measured resistor is zero.

[0025] When the current value of the first current signal is greater than the current value of the second current signal, the output voltage of the first coil is greater than the output voltage of the second coil, the first induced current is greater than the second induced current, the current flowing through the resistor under test is the first induced current minus the second induced current, and the potential value of the first end of the resistor under test is higher than the potential value of the second end.

[0026] When the current value of the first current signal is less than the current value of the second current signal, the output voltage of the first coil is less than the output voltage of the second coil, the first induced current is less than the second induced current, the current flowing through the resistor under test is the second induced current minus the first induced current, and the potential value of the first terminal of the resistor under test is lower than the potential value of the second terminal.

[0027] In one embodiment, the current detection device includes a differential amplifier circuit, the differential amplifier circuit comprising:

[0028] A first comparator, the first input terminal of which is connected to the first terminal of the resistor under test, and the second input terminal of which is connected to the first terminal of a sixth resistor;

[0029] The second comparator has its first input terminal connected to the second terminal of the sixth resistor, and its second input terminal connected to the second terminal of the resistor being measured.

[0030] A first differential resistor, the first end of which is connected to the first end of the sixth resistor and the second input terminal of the first comparator, and the second end of which is connected to the output terminal of the first comparator;

[0031] The second differential resistor has its first end connected to the second end of the sixth resistor and the first input terminal of the second comparator, and its second end connected to the output terminal of the second comparator.

[0032] The third differential resistor has its first end connected to the second end of the first differential resistor and the output of the first comparator.

[0033] A third comparator, wherein the first input terminal of the third comparator is connected to the second terminal of the third differential resistor;

[0034] A fourth differential resistor, the first end of which is connected to the second end of the third differential resistor and the first input terminal of the third comparator, and the second end of the fourth differential resistor is connected to the output terminal of the third comparator;

[0035] The fifth differential resistor has its first end connected to the second end of the second differential resistor and the output of the second comparator.

[0036] The sixth differential resistor has its first end connected to the second end of the fifth differential resistor and the second input terminal of the third comparator, and its second end receives a bias voltage signal.

[0037] Among them, the first differential resistor and the second differential resistor are the same, and the third differential resistor, the fourth differential resistor, the fifth differential resistor and the sixth differential resistor are the same.

[0038] In one embodiment, the voltage difference between the output voltage of the first comparator and the output voltage of the second comparator is expressed as:

[0039] ;

[0040] When the bias voltage signal acts alone, the first output voltage at the output terminal of the third comparator is expressed as:

[0041] ;

[0042] The voltage at the second input terminal of the third comparator is the voltage divided by the fifth and sixth differential resistors of the output terminal of the second comparator; the voltage at the first input terminal of the third comparator is the voltage divided by the third differential resistor and the fourth differential resistor of the second output terminal of the third comparator; when the output voltage of the second comparator acts alone...

[0043] ;

[0044] The second output voltage at the output terminal of the third comparator is expressed as: ;

[0045] When the output voltage of the first comparator acts alone:

[0046] ;

[0047] The third output voltage at the output terminal of the third comparator is expressed as follows: ;

[0048] The output voltage of the third comparator is equal to the sum of the first output voltage, the second output voltage, and the third output voltage of the third comparator. Therefore, the output voltage of the third comparator can be expressed as:

[0049] ;

[0050] ;

[0051] Wherein, the magnification factor G is: .

[0052] In one embodiment, the processing module includes:

[0053] The processor, connected to the control module, controls the pulse signal sent by the control module to disconnect the first switching element and the second switching element when the current difference between the first current and the second current signal is not within the allowable range.

[0054] In one embodiment, the processing module further includes:

[0055] A first digital-to-analog converter (DAC) is connected at its first terminal to the processor and at its second terminal to the second terminal of the sixth differential resistor, and provides the bias voltage signal.

[0056] A second digital-to-analog converter, the first end of which is connected to the processor;

[0057] The fourth comparator has its first input terminal connected to the second terminal of the second digital-to-analog converter to receive a first reference comparison voltage; the second input terminal of the fourth comparator is connected to the output terminal of the third comparator to receive the output voltage of the third comparator.

[0058] A third digital-to-analog converter, the first end of which is connected to the processor;

[0059] The fifth comparator has its first input terminal connected to the output terminal of the third comparator and the second input terminal of the fourth comparator, and receives the output voltage of the third comparator; the second input terminal of the fifth comparator is connected to the second terminal of the third digital-to-analog converter, and receives the second reference comparison voltage.

[0060] In one embodiment, the processing module further includes:

[0061] A first diode, the first end of which is connected to the output of the fourth comparator;

[0062] The second diode, the first end of which is connected to the output of the fifth comparator;

[0063] The first bistable trigger has its pulse signal terminal connected to the second terminal of the first diode, and its preset level signal terminal, input terminal, clear signal terminal and output terminal connected to the processor.

[0064] The second bistable trigger has its pulse signal terminal connected to the second terminal of the second diode, and its preset level signal terminal, input terminal, clear signal terminal and output terminal connected to the processor.

[0065] Specifically, when the current value of the first current signal is greater than the current difference of the second current signal and is not within the allowable range, the output voltage of the third comparator is lower than the first reference comparison voltage, the output of the fourth comparator is low, the output of the fifth comparator is high, the output of the first bistable trigger is low, the output of the second bistable trigger is high, and the processor sends the discharge abnormality warning signal to the control module and disconnects the first switching element and the second switching element.

[0066] Specifically, when the difference between the current value of the first current signal and the current value of the second current signal is within the allowable range, the output voltage of the third comparator is between the first reference comparison voltage and the second reference comparison voltage, the output of the fourth comparator is high, the output of the fifth comparator is high, the output of the first bistable trigger is high, the output of the second bistable trigger is high, and the processor does not send the discharge abnormality warning signal to the control module.

[0067] Specifically, when the current value of the first current signal is less than the current difference of the second current signal and is not within the allowable range, the output voltage of the third comparator is higher than the second reference comparison voltage, the output of the fourth comparator is high, the output of the fifth comparator is low, the output of the first bistable trigger is high, the output of the second bistable trigger QD2 is low, the processor sends the discharge abnormality warning signal to the control module and disconnects the first switching element and the second switching element.

[0068] Secondly, embodiments of the present invention also disclose a control method for a current detection device, the control method being applied to the aforementioned current detection device, the control method comprising:

[0069] Current detection is performed on the first and second branches of the high-voltage discharge circuit to obtain the first current signal and the second current signal, respectively.

[0070] When the current difference between the first current signal and the second current signal is not within the allowable range, a discharge abnormality warning signal is generated;

[0071] A pulse signal is sent according to the discharge abnormality warning signal to disconnect the first branch and the second branch.

[0072] Thirdly, the present invention provides a vascular calcification treatment device, including the aforementioned current detection device and a solution tank; wherein, the two ends of the solution tank are respectively connected to positive and negative high voltages to form a high-voltage discharge circuit.

[0073] As described above, this invention discloses a current detection device, a control method, and a vascular calcification treatment device. The current detection device includes a current detection module, a processing module, and a control module. The current detection module is disposed in a high-voltage discharge circuit and is used to detect the current in the first and second branches of the high-voltage discharge circuit to obtain a first current signal and a second current signal, respectively. The processing module is coupled to the current detection module. When the current difference between the first and second current signals is not within the allowable range, the processing module generates a discharge abnormality warning signal. The control module is connected to the processing module and the current detection module and is used to send a pulse signal to disconnect the first and second branches when receiving the discharge abnormality warning signal from the processing module. This invention can be used to avoid severe current unevenness in the first and second branches connected in parallel in a high-voltage discharge circuit, thereby improving the stability of the system and the safety of the equipment. In other words, the current detection device proposed in this invention can monitor and handle the overcurrent problem of the first and second branches by setting a processor. Simultaneously, by setting pre-thresholds for the first, second, and third digital-to-analog converters (bias voltage signal, first reference comparison voltage, and second reference comparison voltage, respectively), the discharge process can be ignored; only the electrical interface level of the processor needs to be read to make a judgment. The pre-threshold setting ensures that system parameters can have errors during product manufacturing and testing, providing high flexibility. Furthermore, the current detection module can be equipped with a PCB Rogowski coil. The PCB Rogowski coil is electrically isolated from the tested conductors (first and second branches), so it does not consume primary energy during measurement. Non-contact measurement does not alter the original electrical circuit, and the coreless structure avoids magnetic saturation. The PCB Rogowski coil has high manufacturing precision, good consistency, and low manufacturing cost, and it does not require connection to a high-voltage discharge circuit, avoiding the influence of the high-voltage circuit on the tested circuit, thus providing high safety. Attached Figure Description

[0074] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0075] Figure 1 A circuit diagram of a current detection device provided in an embodiment of the present invention.

[0076] Figure 2 The PCB coil equivalent circuit diagram of the first PCB Rogowski coil and the second PCB Rogowski coil in the current detection device provided in the embodiment of the present invention.

[0077] Figure 3 A flowchart of a control method for a current detection device provided in an embodiment of the present invention.

[0078] Figure 4 A detailed flowchart of the control method for the current detection device provided in an embodiment of the present invention.

[0079] Figure 5 This is a circuit diagram of a vascular calcification treatment device provided in an embodiment of the present invention. Detailed Implementation

[0080] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. Based on the description of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0081] In the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0082] The terms “first,” “second,” “third,” etc., are used merely to distinguish numerical values ​​or elements with similar properties, rather than to indicate or imply relative importance or a specific order.

[0083] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0084] Please see Figure 1 , Figure 1 This is a circuit diagram of a current detection device provided in an embodiment of the present invention. The current detection device 100 includes a current detection module 110, a processing module 130, and a control module 140. The current detection module 110 is disposed in a high-voltage discharge circuit and is used to detect the current in the first branch and the second branch of the high-voltage discharge circuit to obtain a first current signal I2 and a second current signal I3, respectively. The processing module 130 is coupled to the current detection module 110. When the current difference between the first current signal I2 and the second current signal I3 is not within the allowable range, the processing module 130 generates a discharge abnormality warning signal. The control module 140 is connected to the processing module 130 and the current detection module 110 and is used to send a pulse signal to disconnect the first branch and the second branch when receiving the discharge abnormality warning signal sent by the processing module 130.

[0085] In one embodiment, such as Figure 1 As shown, the current detection device includes a differential amplifier circuit 120, which is connected between the current detection module 110 and the processing module 130 to differentially amplify the first current signal I2 and the second current signal I3.

[0086] In one embodiment, such as Figure 1 As shown, the current detection module 110 includes a first PCB Rogowski coil L1 and a second PCB Rogowski coil L2. The first PCB Rogowski coil L1 generates a first coil output voltage U1 based on a first current signal I2. The second PCB Rogowski coil L2 generates a second coil output voltage U2 based on a second current signal I3. The difference between the first coil output voltage U1 and the second coil output voltage U2 is used to determine whether the current difference between the first current signal I2 and the second current signal I3 is within an allowable range.

[0087] In one embodiment, such as Figure 1 As shown, the current detection device 100 also includes a resistor to be measured, RS. The first end of the resistor to be measured is connected to the first end of the first PCB Rogowski coil L1, and the second end of the resistor to be measured is connected to the first end of the second PCB Rogowski coil L2. The potential difference between the two ends of the resistor to be measured is Uba. The second end of the first PCB Rogowski coil L1 is connected to the second end of the second PCB Rogowski coil L2, and the winding directions of the first PCB Rogowski coil L1 and the second PCB Rogowski coil L2 are opposite, so that the directions of the first coil output voltage U1 and the second coil output voltage U2 are opposite.

[0088] The control module 140 transmits pulse signals to the control terminals of the second switching element Q2 and the first switching element Q1 respectively through the fourth resistor R4 and the fifth resistor R5. The first switching element Q1 is located in the first branch, and its first terminal receives the first current signal I2 through the first current sharing resistor R1. The second switching element Q2 is located in the second branch, and its first terminal receives the second current signal I3 through the second current sharing resistor R2. The second terminals of both the first and second switching elements Q1 and Q2 are connected to the third resistor R3.

[0089] Figure 2 The equivalent circuit diagrams of the first and second PCB Rogowski coils in the current detection device provided in this embodiment of the invention are shown below. When measuring current with the PCB Rogowski coil, a sampling resistor needs to be connected to the coil output terminal. The equivalent circuit is shown below. Figure 2 As shown, where L0 is the self-inductance of the PCB coil, R0 is the internal resistance of the coil, C0 is the distributed capacitance, and R... S For sampling resistors; i 1 represents the measured current. i 2 represents the coil induced current, and U0 represents the coil output voltage. e The induced electromotive force of the coil can be integrated by an integrating circuit. The coil output voltage U0 and the measured current are then compared. i The signal is directly proportional to the measured current. The sensing principle of a PCB Rogowski coil is electromagnetic induction, characterized by its small size and low cost. The relationship between the signal output and the measured current intensity is highly linear. Due to electrical isolation between the coil and the conductor being measured, no primary energy is consumed during measurement. Furthermore, the coreless structure avoids magnetic saturation issues. Large pulse currents have large peak values, fast rise times, and wide frequency coverage, requiring short measurement times and wide bandwidths from the sensor. Changes in magnetic flux represent changes in current. Rogowski coils were initially developed to measure large pulse currents, and with technological advancements, their accuracy and response time for measuring large pulse currents have significantly improved. PCB coils are manufactured by mounting the Rogowski coil on a PCB board, resulting in high manufacturing precision, good consistency, ease of mass production, and low cost in mass production.

[0090] Specifically, the first switching element Q1 receives the first current I2 from the first branch of the high-voltage discharge circuit through the first current-sharing resistor R1. The second switching element Q2 receives the second current I3 from the second branch of the high-voltage discharge circuit through the second current-sharing resistor R2. The first current-sharing resistor R1 and the second current-sharing resistor R2 are connected to the positive high voltage HV+. Wherein, I1 = I2 + I3. The first current signal I2 is used to generate the first coil output voltage U1 in the first PCB Rogowski coil L1. The second current signal I3 is used to generate the second coil output voltage U2 in the second PCB Rogowski coil L2. The second switching element Q2 is connected in parallel with the first switching element Q1. The second terminal of the first switching element Q1 and the second terminal of the second switching element Q2 are connected to the first terminal of the third resistor R3, and the third resistor R3 is connected to the negative high voltage HV-.

[0091] The processing module 130 is coupled to the current detection module 110. When the current difference between the first current signal I2 and the second current signal I3 is not within the allowable range, the processing module 130 generates a discharge abnormality warning signal. The control module 140 is connected to the processing module 130 and the current detection module 110. When it receives the discharge abnormality warning signal sent by the processing module 130, it sends a pulse signal to disconnect the first branch and the second branch.

[0092] When the current difference between the first current signal I2 and the second current signal I3 is not within the allowable range, the pulse signal sent by the control module 140 is used to disconnect the first switching element Q1 and the second switching element Q2.

[0093] When the current difference between the first current signal I2 and the second current signal I3 is within the allowable range, the control module 140 sends a pulse signal after a preset time to disconnect the first switching element Q1 and the second switching element Q2.

[0094] When the current value of the first current signal I2 is the same as the current value of the second current signal I3, the output voltage U1 of the first coil and the output voltage U2 of the second coil are the same, and the current flowing through the measured resistor RS is zero.

[0095] When the current value of the first current signal I2 is greater than the current value of the second current signal I3, the output voltage U1 of the first coil is greater than the output voltage U2 of the second coil, the first induced current IS1 is greater than the second induced current IS2, the current flowing through the measured resistor RS is the first induced current IS1 minus the second induced current IS2, and the potential value Ua at the first end of the measured resistor RS is higher than the potential value Ub at the second end.

[0096] When the current value of the first current signal I2 is less than the current value of the second current signal I3, the output voltage U1 of the first coil is less than the output voltage U2 of the second coil, the first induced current IS1 is less than the second induced current IS2, the current flowing through the measured resistor RS is the second induced current IS2 minus the first induced current IS1, and the potential value Ua at the first end of the measured resistor RS is lower than the potential value Ub at the second end.

[0097] Therefore, when the current difference between the first current signal I2 and the second current signal I3 is not within the allowable range, the control module 140, such as the field-programmable gate array (FPGA), sends a pulse signal to disconnect the first switching element Q1 and the second switching element Q2. Conversely, when the current difference between the first current signal I2 and the second current signal I3 is within the allowable range, the control module 140, such as the FPGA, sends a pulse signal to close the first switching element Q1 and the second switching element Q2. The current detection device 100 provided by this invention, through the setting of a preset threshold, can ensure that the current difference between the first current signal I2 and the second current signal I3 allows for a preset error in the system parameters before disconnecting or closing the first switching element Q1 and the second switching element Q2, such as a transistor, after comparison, thus exhibiting high flexibility and accurate automatic circuit control.

[0098] In other words, the current detection device 100 proposed in this application, with the first and second branches connected in parallel, can share the large current in the high-voltage discharge circuit, improve the system's ability to withstand load current, enhance system stability, and offer high cost-effectiveness. However, due to differences in the internal parameters of switching elements such as IGBTs in each branch, as well as the asymmetry in circuit topology and drive circuit layout, the output current of the parallel branches is difficult to maintain completely consistent. This leads to static and dynamic current imbalance problems among the switching elements such as IGBTs in the parallel branches. Static current imbalance mainly refers to the uneven distribution of load current in each branch where the switching elements such as IGBTs are located when they are turned on. This usually stems from inconsistencies in the following factors among the switching elements such as IGBTs: the output characteristics of the switching elements such as IGBTs, the drive voltage applied to the gate of the switching elements such as IGBTs, the power circuit characteristics of each branch where the parallel switching elements such as IGBTs are located, and the temperature characteristics. Dynamic current imbalance mainly refers to the inconsistency in the start time of the turn-on and turn-off processes of various parallel switching elements such as IGBTs, as well as the rate of change of collector and gate current during the corresponding processes. This causes some switching elements, such as IGBTs, to bear larger currents. Factors causing dynamic current imbalance typically include: the switching characteristics of the switching elements, such as IGBTs, the gate drive circuit parameters, the power circuit characteristics, and the temperature characteristics. With long-term use of switching elements such as IGBTs, those bearing larger currents may prematurely age or fail, affecting the reliability and stability of the system. By detecting the branch current in each branch of the high-voltage discharge, the current status of each switching element, such as IGBT, during the discharge process can be understood. When the branch current difference reaches a set value, the detection output status changes, and the processing module 130 receives the information and provides a prompt to inform the user of the equipment's discharge status. If necessary, the discharge process can be terminated, and an abnormal alarm can be issued.

[0099] In one embodiment, the current detection device 100 further includes a differential amplifier circuit 120. The differential amplifier circuit 120 includes a first comparator A1, a second comparator A2, a third comparator A3, a first differential resistor RF1, a second differential resistor RF2, a third differential resistor RF3, a fourth differential resistor RF4, a fifth differential resistor RF5, and a sixth differential resistor RF6. The first input terminal of the first comparator A1 is connected to the first terminal of the resistor being measured, RS. The second input terminal of the first comparator A1 is connected to the first terminal of the sixth resistor, RG. The first input terminal of the second comparator A2 is connected to the second terminal of the sixth resistor, RG. The second input terminal of the second comparator A2 is connected to the second terminal of the resistor being measured, RS. The first terminal of the first differential resistor RF1 is connected to the first terminal of the sixth resistor, RG, and the second input terminal of the first comparator A1. The second terminal of the first differential resistor RF1 is connected to the output terminal of the first comparator A1. The first terminal of the second differential resistor RF2 is connected to the second terminal of the sixth resistor, RG, and the first input terminal of the second comparator A2. The second terminal of the second differential resistor RF2 is connected to the output terminal of the second comparator A2. The first terminal of the third differential resistor RF3 is connected to the second terminal of the first differential resistor RF1 and the output terminal of the first comparator A1. The first input terminal of the third comparator A3 is connected to the second terminal of the third differential resistor RF3. The first terminal of the fourth differential resistor RF4 is connected to the second terminal of the third differential resistor RF3 and the first input terminal of the third comparator A3. The second terminal of the fourth differential resistor RF4 is connected to the output terminal of the third comparator A3. The first terminal of the fifth differential resistor RF5 is connected to the second terminal of the second differential resistor RF2 and the output terminal of the second comparator A2. The first terminal of the sixth differential resistor RF6 is connected to the second terminal of the fifth differential resistor RF5 and the second input terminal of the third comparator A3. The second terminal of the sixth differential resistor RF6 receives the bias voltage signal Uref. In this embodiment, the first differential resistor RF1 and the second differential resistor RF2 are set to be the same, and the third differential resistor RF3, the fourth differential resistor RF4, the fifth differential resistor RF5, and the sixth differential resistor RF6 are also set to be the same. This facilitates subsequent formula calculations and derivation, allowing for errors in system parameters during the testing process through the setting of a pre-defined threshold. This provides greater flexibility and increases the accuracy of circuit control.

[0100] In one embodiment, the voltage difference Udc between the output voltage Uc of the first comparator A1 and the output voltage Ud of the second comparator A2 is expressed as:

[0101] ;

[0102] When the bias voltage signal Uref acts alone, the first output voltage Uout1 at the output terminal of the third comparator A3 is expressed as:

[0103] ;

[0104] The voltage Uf at the second input terminal of the third comparator A3 is the voltage division of the output voltage Ud of the second comparator A2 across the fifth differential resistor RF5 and the sixth differential resistor RF6; the voltage Ue at the first input terminal of the third comparator A3 is the voltage division of the second output voltage Uout2 of the third comparator A3 across the third differential resistor RF3 and the fourth differential resistor RF4; when the output voltage Ud of the second comparator A2 acts alone...

[0105] ;

[0106] Then the second output voltage Uout2 at the output terminal of the third comparator A3 is expressed as: ;

[0107] When the output voltage Uc of the first comparator A1 acts alone:

[0108] ;

[0109] The third output voltage Uout3 at the output terminal of the third comparator A3 is expressed as: ;

[0110] The output voltage Uout of the third comparator A3 is equal to the sum of the first output voltage Uout1, the second output voltage Uout2, and the third output voltage Uout3 of the third comparator A3. Therefore, the output voltage Uout of the third comparator A3 can be expressed as:

[0111] ;

[0112] ;

[0113] Wherein, the magnification factor G is:

[0114] .

[0115] In one embodiment, the processing module 130 further includes a processor MCU connected to the control module 140. When the current difference between the first current I2 and the second current signal I3 is not within the allowable range, the processor MCU controls the pulse signal sent by the control module 140 to disconnect the first switching element Q1 and the second switching element Q2.

[0116] In one embodiment, the processing module 130 further includes a first digital-to-analog converter (DAC1), a second digital-to-analog converter (DAC2), a third digital-to-analog converter (DAC3), a fourth comparator A4, and a fifth comparator A5. The processor MCU is connected to a field-programmable gate array (FPGA). When the current difference between the first current I2 and the second current signal I3 is not within the allowable range, the controller MCU controls the FPGA to send a pulse signal to disconnect the first switching element Q1 and the second switching element Q2 to avoid overcurrent damage. The first terminal of the first digital-to-analog converter (DAC1) is connected to the processor MCU. The second terminal of the first digital-to-analog converter (DAC1) is connected to the second terminal of the sixth differential resistor RF6 and provides a bias voltage signal Uref. The first terminal of the second digital-to-analog converter (DAC2) is connected to the processor MCU. The first input terminal of the fourth comparator A4 is connected to the second terminal of the second digital-to-analog converter (DAC2) and receives a first reference comparison voltage Ucon1. The second input terminal of the fourth comparator A4 is connected to the output terminal of the third comparator A3 and receives the output voltage Uout of the third comparator A3. The first terminal of the third digital-to-analog converter (DAC3) is connected to the processor MCU. The first input terminal of the fifth comparator A5 is connected to the output terminal of the third comparator A3 and the two input terminals of the fourth comparator A4, receiving the output voltage Uout from the output terminal of the third comparator A3. The second input terminal of the fifth comparator A5 is connected to the second terminal of the third digital-to-analog converter DAC3, receiving the second reference comparison voltage Ucon2.

[0117] In one embodiment, the current detection device 100 further includes a first diode D1, a second diode D2, a first bistable trigger QD1, and a second bistable trigger QD2. The first terminal of the first diode D1 is connected to the output terminal of a fourth comparator A4. The first terminal of the second diode D2 is connected to the output terminal of a fifth comparator A5. The pulse signal terminal CK of the first bistable trigger QD1 is connected to the second terminal of the first diode D1. The preset level signal terminal PR, input terminal D, clear signal terminal CLR, and output terminal Q of the first bistable trigger QD1 are connected to the processor MCU. The pulse signal terminal CK of the second bistable trigger QD2 is connected to the second terminal of the second diode D2. The preset level signal terminal PR, input terminal D, clear signal terminal CLR, and output terminal Q of the second bistable trigger QD2 are connected to the processor MCU.

[0118] Specifically, when the current value of the first current signal I2 is greater than the current difference of the second current signal I3 and is not within the allowable range, the output voltage Uout of the third comparator A3 is lower than the first reference comparison voltage Ucon1, the output of the fourth comparator A4 is low, the output of the fifth comparator A5 is high, the output of the first bistable trigger QD1 is low, the output of the second bistable trigger QD2 is high, the processor MCU sends a discharge abnormality warning signal value to the field programmable gate array circuit FPGA and disconnects the first switching element Q1 and the second switching element Q2.

[0119] In one embodiment, when the current value of the first current signal I2 and the current difference of the second current signal I3 are within the allowable range, the output voltage Uout of the third comparator A3 is between the first reference comparison voltage Ucon1 and the second reference comparison voltage Ucon2. The output of the fourth comparator A4 is high, the output of the fifth comparator A5 is high, the output of the first bistable flip-flop QD1 is high, the output of the second bistable flip-flop QD2 is high, and the pulse signal sent by the controller MCU to the field programmable gate array circuit FPGA is used to close the first switching element Q1 and the second switching element Q2.

[0120] In one embodiment, when the current value of the first current signal I2 is less than the current difference of the second current signal I3 and is outside the allowable range, the output voltage Uout of the third comparator A3 is higher than the second reference comparison voltage Ucon2. The output of the fourth comparator A4 is high, the output of the fifth comparator A5 is low, the output of the first bistable trigger QD1 is high, the output of the second bistable trigger QD2 is low, and the processor MCU sends a discharge abnormality warning signal to the field programmable gate array circuit FPGA and disconnects the first switching element Q1 and the second switching element Q2. The current detection device 100 of the present invention simultaneously sets the pre-threshold through the first, second, and third digital-to-analog conversion circuits, so it does not need to worry about the problem of excessive error generated during the discharge process. It only needs to read the electrical interface level status of the processor to make a judgment, which has high flexibility and automatic control precision.

[0121] Therefore, the current detection device 100 proposed in this application can be used for branch current sharing detection. By detecting the branch current in each branch of the high-voltage discharge circuit, the signals collected from each branch are differentially amplified. After differential amplification, the output amplitude increases, and after biasing, the output voltage is positive. The processing module 130 sets the upper and lower limits of the current difference voltage through the DAC module. The output voltage is compared by a comparator and the level is held by a bistable trigger. If the differentially amplified and biased voltage is within the upper and lower limits, and the output levels of the bistable triggers are both high, then the branch current difference is within the allowable range, the current difference between the two branches is not significant, and the branch current is within the carrying capacity of the switching elements such as IGBTs, so there will be no risk of overcurrent to the switching elements such as IGBTs. If the differentially amplified and biased voltage is outside the upper and lower limits, and the output levels of the first bistable trigger QD1 and the second bistable trigger QD2 are low, then the branch current difference is too large, indicating that either the first branch current or the second branch current is too large. Long-term use will greatly shorten the service life of the switching elements such as IGBTs on the branches, and in severe cases, it will cause the switching elements such as IGBTs to fail and be damaged. The branch that is experiencing overcurrent can be identified by the pin that shows a low level. To prevent the IGBT from experiencing overcurrent in one branch due to large current differences, which could easily lead to IGBT failure or damage, the processing module 130 immediately sends a switch-off command to the control module 140 (FPGA) when an abnormal pin level signal is detected. The control module 140 (FPGA) then shuts down the IGBT and stops the high-voltage pulse output, thus preventing damage to the equipment.

[0122] Please see Figure 3 , Figure 3 This is a flowchart illustrating a control method for a current detection device provided in an embodiment of the present invention. The present invention also provides a control method applied to the aforementioned current detection device; its specific implementation can be found in the corresponding content of the current detection device in the above embodiments. The control method includes:

[0123] S210 performs current detection on the first and second branches of the high-voltage discharge circuit to obtain the first current signal and the second current signal respectively.

[0124] S220 generates a discharge abnormality warning signal when the current difference between the first current signal and the second current signal is not within the allowable range;

[0125] S230 sends a pulse signal based on the discharge abnormality warning signal to disconnect the first branch and the second branch.

[0126] Please also refer to Figure 1 and Figure 4 , Figure 4A flowchart illustrating the control method for the current detection device provided in an embodiment of the present invention. One embodiment of the control method specifically includes:

[0127] The S301 uses the processor MCU to set the reference comparison voltage of the digital-to-analog converter (DAC) output to set the upper and lower limit voltages.

[0128] S302 is driven by a field-programmable gate array (FPGA) to close the first switching element Q1 and the second switching element Q2, such as an IGBT.

[0129] S303 The first current signal I2 flows through the first branch, and the second current signal I3 flows through the second branch;

[0130] The first PCB Rogowski coil of the first branch of S304 generates a first induced electromotive force, or the second PCB Rogowski coil of the second branch generates a second induced electromotive force.

[0131] S305 differentially amplifies and biases the first coil output voltage U1 and the second coil output voltage U2;

[0132] S306 compares the output voltage at the output terminal of the third comparator A3 with the upper and lower limit voltages;

[0133] S307 compares the level state of the output terminal of the first bistable flip-flop QD1 and the level state of the output terminal of the second bistable flip-flop QD2.

[0134] S308 stabilizes the level states of the first bistable flip-flop QD1 and the second bistable flip-flop QD2;

[0135] S309 determines whether the output levels of the first bistable flip-flop QD1 and the second bistable flip-flop QD2 are both high; if yes, execute S310; if no, execute S314.

[0136] The outputs of the first bistable flip-flop QD1 and the second bistable flip-flop QD2 of the S310 are both at a high level.

[0137] The current value of the first current signal I2 and the current difference between the second current signal I3 are within the allowable range;

[0138] The S312 field-programmable gate array circuit controls the first switching element Q1 and the second switching element Q2, such as turning off the IGBT after the time limit is reached.

[0139] The high-voltage discharge of the S313 current detection device is normal, end;

[0140] S314 determines whether the output level of the first bistable flip-flop QD1 is low.

[0141] When the first bistable trigger QD1 is low, an overcurrent event occurs as the first current signal I2 flows through the first branch.

[0142] The S316 field-programmable gate array (FPGA) controls the first and second switching elements to turn off immediately.

[0143] The S317 processor MCU generates a discharge abnormality warning signal based on the overcurrent event in the first branch, and then terminates.

[0144] When the first bistable trigger is not at a low level, the second current signal I2 flows through the second branch, causing an overcurrent event.

[0145] The S319 field-programmable gate array (FPGA) circuit controls the first switching element Q1 and the second switching element Q2, such as the IGBT, to turn off immediately.

[0146] The S320 processor MCU generates a discharge abnormality warning signal based on the overcurrent event in the second branch, and then terminates.

[0147] Please also refer to Figure 1 and Figure 5 , Figure 5 This is a circuit diagram of a vascular calcification treatment device provided in an embodiment of the present invention. The present invention provides a vascular calcification treatment device 300, including the aforementioned current detection device 100 and a solution tank 310. The two ends of the solution tank 310 are respectively connected to positive and negative high voltages HV+ and HV- to form a high-voltage discharge circuit. HV+ and HV- have voltages as high as several kilovolts. When the control module, such as an FPGA, controls the parallel switching elements to conduct, there is a large voltage difference across the solution G, causing ionization and breakdown of the solution G. During the breakdown process, the equivalent impedance of the solution is relatively small, and a very large current will be generated in the discharge circuit. This current will flow through the two parallel switching elements Q1 and Q2, and then through HV-. Due to the mismatch between usage requirements and the characteristics of conventional switching elements such as IGBTs, the current that switching elements such as IGBTs can carry is limited. A single switching element such as an IGBT cannot withstand the current surge generated during discharge. Using parallel switching elements allows them to share the discharge current. Under ideal conditions, the current in the circuit is evenly distributed between the two branches, and the current carried by a single IGBT is within the device's allowable range, preventing damage to the IGBT. However, in actual use, due to the differences between IGBTs and their circuit topologies, it is difficult to maintain complete consistency. The branch currents are different, and the current carried by the IGBTs will also be different.

[0148] This embodiment aims to detect the current in each parallel branch of a high-voltage discharge circuit in a vascular calcification treatment device. By setting corresponding PCB Rogowski coils in each parallel branch of the discharge circuit and differentially amplifying the output signals of the PCB Rogowski coils, the current differences in each branch can be obtained, allowing for current sharing analysis of each branch. During the high-voltage discharge process of the shock wave device, a huge current flows through the high-voltage discharge circuit, meaning the parallel branches will carry a massive current. If PCB Rogowski coils are added to each branch, the magnetic flux of the PCB Rogowski coils changes when current flows through them, generating a corresponding coil output voltage. The larger the current flowing through a branch, the stronger the magnetic induction, and the higher the coil output voltage. Therefore, the magnitude of the current flowing through switching elements such as IGBTs in the branch can be reflected in the PCB coil output voltage. If the coil output voltages of two branches are superimposed in opposite directions, differentially amplified, and biased, the output voltage waveform shifts upwards overall, preventing voltages below 0V, reducing the complexity of the detection circuit and facilitating analysis and comparison. The output is then connected to the comparator circuit. The processing module 130 (such as an MCU) sets the upper and lower limits of the comparison reference voltage through the digital-to-analog converter module. After comparison, it outputs high and low levels, which are then connected to a bistable trigger QD to maintain the level, facilitating reading by the processing module 130 (such as the MCU). Based on the state of the two output levels, it can be determined whether the branch current is overcurrent and which branch is experiencing overcurrent. The current sharing detection scheme compares the detected current difference with the set value. If the detected branch current difference is within the set value range, it indicates that the current difference between the two branches is small, and the discharge is as expected. If the detected branch current difference is outside the allowable range, it indicates that the branch current difference is large, and one branch is experiencing overcurrent. In this case, the control module 140 will prohibit the high-voltage pulse output and issue an abnormality warning to prevent equipment damage and other safety accidents.

[0149] The present invention provides a current detection device, a control method, and a vascular calcification treatment device. The current detection device includes a current detection module, a processing module, and a control module. The current detection module is disposed in a high-voltage discharge circuit and is used to detect the current in the first and second branches of the high-voltage discharge circuit to obtain a first current signal and a second current signal, respectively. The processing module is coupled to the current detection module. When the current difference between the first and second current signals is not within the allowable range, the processing module generates a discharge abnormality warning signal. The control module is connected to the processing module and the current detection module and is used to send a pulse signal to disconnect the first and second branches when receiving the discharge abnormality warning signal from the processing module. The present invention can be used to avoid severe current unevenness in the first and second branches connected in parallel in a high-voltage discharge circuit, thereby improving the stability of the system and the safety of the equipment. In other words, the current detection device proposed in this invention can monitor and handle the overcurrent problem of the first and second branches by setting a processor. Simultaneously, by setting pre-thresholds for the first, second, and third digital-to-analog converters (bias voltage signal, first reference comparison voltage, and second reference comparison voltage, respectively), the discharge process can be ignored; only the electrical interface level of the processor needs to be read to make a judgment. The pre-threshold setting ensures that system parameters can have errors during product manufacturing and testing, providing high flexibility. Furthermore, the current detection module can be equipped with a PCB Rogowski coil. The PCB Rogowski coil is electrically isolated from the tested conductors (first and second branches), so it does not consume primary energy during measurement. Non-contact measurement does not alter the original electrical circuit, and the coreless structure avoids magnetic saturation. The PCB Rogowski coil has high manufacturing precision, good consistency, and low manufacturing cost, and it does not require connection to a high-voltage discharge circuit, avoiding the influence of the high-voltage circuit on the tested circuit, thus providing high safety.

[0150] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A current detection device, characterized in that, A high-voltage discharge circuit used in a device for treating vascular calcification, wherein the current detection device includes: A current detection module (110) is disposed in the high-voltage discharge circuit. The current detection module (110) is used to detect the current in the first branch and the second branch of the high-voltage discharge circuit to obtain a first current signal (I2) and a second current signal (I3) respectively. The current detection module (110) includes: The first PCB Rogowski coil (L1) generates a first coil output voltage (U1) based on the first current signal (I2); The second PCB Rogowski coil (L2) generates a second coil output voltage (U2) based on the second current signal (I3); The resistor under test (RS) has its first end connected to the first end of the first PCB Rogowski coil (L1), and its second end connected to the first end of the second PCB Rogowski coil (L2). The potential difference between the two ends of the resistor under test (RS) is Uba. The second end of the first PCB Rogowski coil (L1) is connected to the second end of the second PCB Rogowski coil (L2), and the winding directions of the first PCB Rogowski coil (L1) and the second PCB Rogowski coil (L2) are opposite, so that the output voltage (U1) of the first coil and the output voltage (U2) of the second coil are in opposite directions. The processing module (130) is coupled to the current detection module (110). When the current difference between the first current signal (I2) and the second current signal (I3) is not within the allowable range, the processing module (130) generates a discharge abnormality warning signal. The control module (140), connected to the processing module (130) and the current detection module (110), is used to send a pulse signal to disconnect the first branch and the second branch when receiving the discharge abnormality prompt signal sent by the processing module (130).

2. The current detection device according to claim 1, characterized in that, The current detection device includes: A differential amplifier circuit (120) is connected between the current detection module (110) and the processing module (130) to differentially amplify the first current signal (I2) and the second current signal (I3).

3. The current detection device according to claim 1, characterized in that, The current detection module (110) determines whether the current difference between the first current signal (I2) and the second current signal (I3) is within the allowable range based on the difference between the first coil output voltage (U1) and the second coil output voltage (U2).

4. The current detection device according to claim 3, characterized in that, The control module (140) transmits the pulse signal to the control terminal of the second switching element (Q2) and the control terminal of the first switching element (Q1) through the fourth resistor (R4) and the fifth resistor (R5), respectively; wherein, the first switching element (Q1) is disposed in the first branch, and the first terminal of the first switching element (Q1) receives the first current signal (I2) through the first current sharing resistor (R1); the second switching element (Q2) is disposed in the second branch, and the first terminal of the second switching element (Q2) receives the second current signal (I3) through the second current sharing resistor (R2); the second terminals of the first switching element (Q1) and the second terminals of the second switching element (Q2) are both connected to the third resistor (R3). When the current difference between the first current signal (I2) and the second current signal (I3) is not within the allowable range, the pulse signal sent by the control module (140) is used to disconnect the first switching element (Q1) and the second switching element (Q2). When the current difference between the first current signal (I2) and the second current signal (I3) is within the allowable range, the control module (140) sends a pulse signal after a preset time to disconnect the first switching element (Q1) and the second switching element (Q2). When the current value of the first current signal (I2) is the same as the current value of the second current signal (I3), the magnitudes of the first coil output voltage (U1) and the second coil output voltage (U2) are the same, and the current flowing through the measured resistor (RS) is zero. When the current value of the first current signal (I2) is greater than the current value of the second current signal (I3), the output voltage of the first coil (U1) is greater than the output voltage of the second coil (U2), the first induced current (IS1) is greater than the second induced current (IS2), the current flowing through the measured resistor (RS) is the first induced current (IS1) minus the second induced current (IS2), and the potential value (Ua) of the first terminal of the measured resistor (RS) is higher than the potential value (Ub) of the second terminal. When the current value of the first current signal (I2) is less than the current value of the second current signal (I3), the output voltage of the first coil (U1) is less than the output voltage of the second coil (U2), the first induced current (IS1) is less than the second induced current (IS2), the current flowing through the measured resistor (RS) is the second induced current (IS2) minus the first induced current (IS1), and the potential value (Ua) of the first terminal of the measured resistor (RS) is lower than the potential value (Ub) of the second terminal.

5. The current detection device according to claim 4, characterized in that, The current detection device (100) includes a differential amplifier circuit (120), which includes: A first comparator (A1) has its first input terminal connected to the first terminal of the resistor under test (RS), and its second input terminal connected to the first terminal of the sixth resistor (RG). The second comparator (A2) has its first input terminal connected to the second terminal of the sixth resistor (RG), and its second input terminal connected to the second terminal of the resistor under test (RS). The first differential resistor (RF1) has its first end connected to the first end of the sixth resistor (RG) and the second input of the first comparator (A1), and its second end connected to the output of the first comparator (A1). The second differential resistor (RF2) has its first end connected to the second end of the sixth resistor (RG) and the first input of the second comparator (A2), and its second end connected to the output of the second comparator (A2). The third differential resistor (RF3) has its first terminal connected to the second terminal of the first differential resistor (RF1) and the output terminal of the first comparator (A1); The third comparator (A3) has its first input terminal connected to the second terminal of the third differential resistor (RF3); The fourth differential resistor (RF4) has its first end connected to the second end of the third differential resistor (RF3) and the first input terminal of the third comparator (A3), and its second end connected to the output terminal of the third comparator (A3). The fifth differential resistor (RF5) has its first terminal connected to the second terminal of the second differential resistor (RF2) and the output terminal of the second comparator (A2); The sixth differential resistor (RF6) has its first terminal connected to the second terminal of the fifth differential resistor (RF5) and the second input terminal of the third comparator (A3). The second terminal of the sixth differential resistor (RF6) receives the bias voltage signal (Uref). Among them, the first differential resistor (RF1) and the second differential resistor (RF2) are the same, and the third differential resistor (RF3), the fourth differential resistor (RF4), the fifth differential resistor (RF5) and the sixth differential resistor (RF6) are the same.

6. The current detection device according to claim 5, characterized in that, The voltage difference (Udc) between the output voltage (Uc) of the first comparator (A1) and the output voltage (Ud) of the second comparator (A2) is expressed as: ； When the bias voltage signal (Uref) acts alone, the first output voltage (Uout1) at the output terminal of the third comparator (A3) is expressed as: ； The second input voltage (Uf) of the third comparator (A3) is the voltage division of the output voltage (Ud) of the second comparator (A2) across the fifth differential resistor (RF5) and the sixth differential resistor (RF6); the first input voltage (Ue) of the third comparator (A3) is the voltage division of the second output voltage (Uout2) of the third comparator (A3) across the third differential resistor (RF3) and the fourth differential resistor (RF4); when the output voltage (Ud) of the second comparator (A2) acts alone, ； The second output voltage (Uout2) at the output terminal of the third comparator (A3) is expressed as: ; When the output voltage (Uc) of the first comparator (A1) acts alone: ； The third output voltage (Uout3) at the output terminal of the third comparator (A3) is expressed as: ; The output voltage (Uout) of the third comparator (A3) is equal to the sum of the first output voltage (Uout1), the second output voltage (Uout2), and the third output voltage (Uout3) of the third comparator (A3). Therefore, the output voltage (Uout) of the third comparator (A3) is expressed as: ； ； Wherein, the magnification factor G is: 。 7. The current detection device according to claim 6, characterized in that, The processing module (130) includes: The processor (MCU) is connected to the control module (140). When the current difference between the first current signal (I2) and the second current signal (I3) is not within the allowable range, the processor (MCU) controls the control module (140) to send the pulse signal to disconnect the first switching element (Q1) and the second switching element (Q2).

8. The current detection device according to claim 7, characterized in that, The processing module (130) further includes: A first digital-to-analog converter (DAC1) is connected at its first terminal to the processor, and at its second terminal to the second terminal of the sixth differential resistor (RF6), and provides the bias voltage signal (Uref). A second digital-to-analog converter (DAC2) is connected at its first end to the processor (MCU); The fourth comparator (A4) has its first input terminal connected to the second terminal of the second digital-to-analog converter (DAC2) and receives a first reference comparison voltage (Ucon1); the second input terminal of the fourth comparator (A4) is connected to the output terminal of the third comparator (A3) and receives the output voltage (Uout) of the third comparator (A3). A third digital-to-analog converter (DAC3) is connected at its first end to the processor (MCU); The fifth comparator (A5) has its first input terminal connected to the output terminal of the third comparator (A3) and the two input terminals of the fourth comparator (A4), and receives the output voltage (Uout) from the output terminal of the third comparator (A3); the second input terminal of the fifth comparator (A5) is connected to the second terminal of the third digital-to-analog converter (DAC3), and receives the second reference comparison voltage (Ucon2).

9. The current detection device according to claim 8, characterized in that, The processing module (130) further includes: The first diode (D1) has its first terminal connected to the output terminal of the fourth comparator (A4); The second diode (D2) has its first terminal connected to the output terminal of the fifth comparator (A5); The first bistable multivibrator (QD1) has its pulse signal terminal (CK) connected to the second terminal of the first diode (D1), and its preset level signal terminal (PR), input terminal (D), clear signal terminal (CLR), and output terminal (Q) connected to the processor (MCU). The second bistable multivibrator (QD2) has its pulse signal terminal (CK) connected to the second terminal of the second diode (D2), and its preset level signal terminal (PR), input terminal (D), clear signal terminal (CLR), and output terminal (Q) connected to the processor (MCU). When the current value of the first current signal (I2) is greater than the current difference of the second current signal (I3) and is not within the allowable range, the output voltage (Uout) of the third comparator (A3) is lower than the first reference comparison voltage (Ucon1), the output of the fourth comparator (A4) is low, the output of the fifth comparator (A5) is high, the output of the first bistable trigger (QD1) is low, the output of the second bistable trigger (QD2) is high, the processor (MCU) sends the discharge abnormality warning signal to the control module (140) and disconnects the first switching element (Q1) and the second switching element (Q2). When the difference between the current value of the first current signal (I2) and the current value of the second current signal (I3) is within the allowable range, the output voltage (Uout) of the third comparator (A3) is between the first reference comparison voltage (Ucon1) and the second reference comparison voltage (Ucon2), the output of the fourth comparator (A4) is high, the output of the fifth comparator (A5) is high, the output of the first bistable trigger (QD1) is high, the output of the second bistable trigger (QD2) is high, and the processor (MCU) does not send the discharge abnormality warning signal to the control module (140). When the current value of the first current signal (I2) is less than the current difference of the second current signal (I3) and is not within the allowable range, the output voltage (Uout) of the third comparator (A3) is higher than the second reference comparison voltage (Ucon2), the output of the fourth comparator (A4) is high, the output of the fifth comparator (A5) is low, the output of the first bistable trigger (QD1) is high, the output of the second bistable trigger (QD2) is low, the processor (MCU) sends the discharge abnormality warning signal to the control module (140) and disconnects the first switching element (Q1) and the second switching element (Q2).

10. A control method for a current detection device, characterized in that, The control method, applied to the current detection device according to any one of claims 1 to 9, comprises: Current detection is performed on the first and second branches of the high-voltage discharge circuit to obtain the first current signal and the second current signal, respectively. When the current difference between the first current signal and the second current signal is not within the allowable range, a discharge abnormality warning signal is generated; A pulse signal is sent according to the discharge abnormality warning signal to disconnect the first branch and the second branch.

11. A device for treating vascular calcification, characterized in that, The invention includes the current detection device and the solution tank as described in any one of claims 1 to 9; wherein the two ends of the solution tank are respectively connected to positive and negative high voltages to form a high-voltage discharge circuit.

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