A constant current control device and ablation apparatus

Abstract

The application discloses a kind of constant current control device and ablation equipment, the constant current control device includes control module, arithmetic constant current module, signal feedback module and load output end;The output end of control module is electrically connected with the input end of arithmetic constant current module, control module is used to provide drive signal to arithmetic constant current module;Arithmetic constant current module is used to export constant current signal to load output end according to drive signal and feedback signal provided by feedback end;The input end of control module is electrically connected with signal feedback module;Signal feedback module is used to obtain current signal flowing through load, control module is used to adjust drive signal provided to arithmetic constant current module according to preset signal and digital detection signal.The technical scheme of the application can output the constant current signal matched with the impedance value of load, which is beneficial to improve the practicability and reliability of constant current control device.

Description

Technical Field

[0001] This application relates to the field of constant current control technology, and in particular to a constant current control device and an ablation device. Background Technology

[0002] A constant current signal circuit is a circuit used to generate specific frequencies, amplitudes, and waveforms. It consists of a signal generator and amplifiers, and is commonly used in positioning, measurement, or communication systems.

[0003] Current constant current signal circuits typically use operational amplifier (op-amp) modules as the constant current source to directly drive the output. However, for high-impedance loads, the range of the constant current and the parameters of the maximum undistorted load impedance depend on the maximum output voltage that the op-amp module can provide, and must satisfy Ohm's law I=U / R. The biggest drawback of this approach is the limited power supply range of the op-amp module. When the product of the load impedance and the constant current value exceeds the maximum supply voltage of the op-amp module, the voltage waveform will exhibit clipping distortion, resulting in the current flowing through the load being less than the constant current value. In this case, the constant current signal circuit will limit the current flowing through the load, leading to a narrow constant current range and the inability to drive high-impedance loads. Summary of the Invention

[0004] This application provides a constant current control device and an ablation device that can output a constant current signal that matches the impedance value of the load, thereby improving the practicality and reliability of the constant current control device.

[0005] In a first aspect, this application provides a constant current control device, including: a control module, a computational constant current module, a transformer circuit, a signal feedback module, and a load output terminal; The load output terminal is used to connect to the load; The output terminal of the control module is electrically connected to the input terminal of the operational constant current module, and the control module is used to provide a drive signal to the operational constant current module; The constant current module is used to output a constant current signal to the load output terminal based on the drive signal and the feedback signal provided by the feedback terminal; The input terminal of the control module is electrically connected to the signal feedback module; the signal feedback module is used to acquire the current signal flowing through the load, and the control module is used to adjust the drive signal provided to the operational constant current module according to the preset signal and the current signal.

[0006] Optionally, the control module includes: a controller and a computing module; The output terminal of the controller is electrically connected to the input terminal of the arithmetic module. The controller is used to regulate the waveform control signal provided to the arithmetic module according to the preset signal and the current signal. The arithmetic module is used to output the drive signal according to the waveform control signal.

[0007] Optionally, the computing module includes: a digital frequency synthesizer, a digital-to-analog converter, and a multiplier; The output terminal of the controller is electrically connected to the input terminals of the digital frequency synthesizer and the digital-to-analog converter, respectively. The first input terminal of the multiplier is electrically connected to the output terminal of the digital frequency synthesizer, the second input terminal of the multiplier is electrically connected to the output terminal of the digital-to-analog converter, and the multiplication output terminal of the multiplier is electrically connected to the input terminal of the constant current module.

[0008] Optionally, the multiplication unit includes a multiplier and a phase-locked loop; The first input terminal of the multiplier is electrically connected to the output terminal of the digital frequency synthesizer, the second input terminal of the multiplier is electrically connected to the output terminal of the digital-to-analog converter, and the output terminal of the multiplier is electrically connected to the modulation signal input terminal of the phase-locked loop. The reference terminal of the phase-locked loop is electrically connected to the output terminal of the digital frequency synthesizer, and the feedback terminal of the phase-locked loop is electrically connected to the output terminal of the phase-locked loop; the phase-locked loop is used to adjust the output driving signal according to the target phase provided by the digital frequency synthesizer, the feedback phase provided by the feedback terminal, and the modulation phase provided by the multiplier; Wherein, the phase of the driving signal is equal to the phase of the target.

[0009] Optionally, the controller is specifically configured to, when the absolute value of the difference between the preset signal and the current signal is greater than zero and less than a first preset value, and when the preset signal is greater than the current signal, use the sum of the first control signal and the first preset value as the control signal provided to the digital-to-analog converter this time; the first control signal is the control signal previously provided to the digital-to-analog converter; or, When the absolute value of the difference between the preset signal and the current signal is greater than zero and less than the first preset value, and when the preset signal is less than the current signal, the difference between the first control signal and the first preset value is used as the control signal provided to the digital-to-analog converter this time.

[0010] Optionally, the controller is further configured to, when the absolute value of the difference between the preset signal and the current signal is greater than a second preset value, and when the preset signal is greater than the current signal, use the sum of the first control signal and the second step value as the control signal provided to the digital-to-analog converter in this instance; or, If the absolute value of the difference between the preset signal and the current signal is greater than the second preset value, and the preset signal is less than the current signal, the difference between the first control signal and the second step value shall be used as the control signal provided to the digital-to-analog converter in this instance. Wherein, the second preset value is greater than the first preset value, and the second step value is greater than the first step value.

[0011] Optionally, the operational constant current module includes: an operational constant current circuit and a transformer circuit; The feedback terminal of the operational constant current circuit is electrically connected to the output terminal of the transformer circuit, and the output terminal of the operational constant current circuit is electrically connected to the input terminal of the transformer circuit. The operational constant current circuit is used to regulate the excitation signal provided to the input terminal of the transformer circuit according to the driving signal and the feedback signal provided by the feedback terminal of the operational constant current circuit. The transformer circuit is used to output a constant current signal to the load output terminal according to the excitation signal.

[0012] Optionally, the control module further includes: a digital isolation module; The digital isolation module is electrically connected between the controller and the computing module.

[0013] Optionally, the signal feedback module includes: a sampling circuit and an analog-to-digital conversion module; The sampling circuit is connected in series with the load at the load output terminal. The sampling output terminal of the sampling circuit is electrically connected to the input terminal of the analog-to-digital converter module, and the output terminal of the analog-to-digital converter module is electrically connected to the input terminal of the controller.

[0014] Optionally, the constant current control device may also include: a feedback isolation module; The feedback isolation module is electrically connected between the analog-to-digital conversion module and the controller.

[0015] Optionally, the constant current control device may also include: a power isolation circuit; The input terminal of the power isolation circuit is electrically connected to the power supply, and the output terminal of the power isolation circuit is electrically connected to each of the power supply terminals of the operational constant current module and the signal feedback module.

[0016] Optionally, the power module further includes: an isolation circuit and at least one step-down circuit; The input terminal of the isolation circuit is electrically connected to the power supply, the output terminal of the isolation circuit is electrically connected to the input terminal of each of the step-down circuits, and the output terminal of each of the step-down circuits is electrically connected to the power supply terminal of the operational constant current module and the power supply terminal of the signal feedback module, respectively.

[0017] Optionally, the operational constant current module includes a feedback circuit and a comparator; The first comparison terminal of the comparator is electrically connected to the output terminal of the control module, the second comparison terminal of the comparator is electrically connected to the output terminal of the feedback circuit, the input terminal of the feedback circuit is electrically connected to the output terminal of the transformer circuit, and the comparison output terminal of the comparator is electrically connected to the input terminal of the transformer circuit.

[0018] Optionally, the transformer circuit includes a boost circuit.

[0019] Secondly, this application provides an ablation device, including the constant current control device described in the first aspect.

[0020] The technical solution of this application embodiment, by setting a signal feedback module, enables the control module to regulate the drive signal provided to the operational constant current module according to the preset signal and the current signal fed back by the signal feedback module and the current signal flowing through the load. This ensures that the operational constant current module can output a constant current signal corresponding to the preset signal under the action of the drive signal, which is beneficial to improving the accuracy and reliability of the constant current signal output by the constant current control device. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a constant current control device provided in an embodiment of this application; Figure 2 This is a schematic diagram of another constant current control device provided in the embodiments of this application; Figure 3 A schematic diagram of another constant current control device provided in the embodiments of this application; Figure 4 A schematic diagram of another constant current control device provided in the embodiments of this application; Figure 5 This is a schematic diagram of the structure of a constant current control device provided in an embodiment of this application; Figure 6 This is a schematic diagram of another constant current control device provided in the embodiments of this application; Figure 7 A schematic diagram of another constant current control device provided in the embodiments of this application; Figure 8 A schematic diagram of another constant current control device provided in the embodiments of this application; Figure 9 This is a schematic diagram of the structure of a constant current control device provided in an embodiment of this application; Figure 10 This is a schematic diagram of the circuit structure of a constant current operational circuit provided in an embodiment of this application.

[0022] Figure 11This is a schematic diagram of the structure of a multiplication operator provided in an embodiment of this application. Detailed Implementation

[0023] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present application, not the entire structure.

[0024] Figure 1 This is a schematic diagram of the structure of a constant current control device provided in an embodiment of this application, as shown below. Figure 1 As shown, the constant current control device includes a control module 10, a computational constant current module 02, a signal feedback module 40, and a load output terminal P. The load output terminal P is used to connect to a load. The output terminal of the control module 10 is electrically connected to the input terminal of the computational constant current module 02, and the control module 10 provides a drive signal to the computational constant current module 02. The computational constant current module 02 outputs a constant current signal to the load output terminal P according to the drive signal. The input terminal of the control module 10 is electrically connected to the signal feedback module 40; the signal feedback module 40 acquires the current signal flowing through the load and transmits the current signal to the control module 10. The control module 10 adjusts the drive signal provided to the computational constant current module 02 according to a preset signal and the current signal.

[0025] The load includes the impedance of the human body surface or other devices with a certain impedance value, which can be set according to actual needs. The constant current signal includes voltage and current signals, and the current signal is the same at different times. The drive signal provided by the control module 10 to the operational constant current module 02 includes AC voltage signals, etc. The operational constant current module 02 includes amplifiers and other devices, and the signal feedback module 40 may include resistors and other devices. The specific circuit structures of the control module 10, the operational constant current module 02, and the signal feedback module 40 can all be designed according to actual needs. Under the premise that their respective functions can be met, the specific structures of the control module 10, the operational constant current module 02, and the signal feedback module 40 are not limited in this application embodiment.

[0026] Specifically, after the control module 10 provides a drive signal to the operational constant current module 02, the operational constant current module 02 provides a constant current signal to the load output terminal P according to the drive signal, so that the current signal flowing through the load can remain constant. When the load output terminal P of the constant current control device is electrically connected to the load and is in the working state, the signal feedback module 40 is used to acquire the analog current signal flowing through the load, convert the analog current signal into a digital current signal, and transmit it to the control module 10. The control module 10 compares the digital current signal with a preset signal, and then adjusts the drive signal provided to the operational constant current module 02, so that the operational constant current module 02 can output a constant current signal corresponding to the preset signal according to the drive signal. For example, the preset signal is a digital signal corresponding to a current of 5A. The control module 10 receives a digital current signal corresponding to an analog current signal of 4A. At this time, the control module 10 can use the previously output drive signal, adjusted by a certain value, as the current drive signal to be output, so that the operational constant current module 02 outputs a constant current signal of 5A corresponding to the preset signal according to the drive signal. Thus, by setting up a signal feedback module, it is beneficial to improve the accuracy and reliability of the constant current signal output by the constant current control device, so as to drive different loads and improve the practicality of the constant current control device.

[0027] The technical solution of this application embodiment, by setting a signal feedback module, enables the control module to regulate the drive signal provided to the operational constant current module according to the preset signal and the current signal flowing through the load fed back by the signal feedback module, so as to ensure that the operational constant current module can output a constant current signal corresponding to the preset signal under the action of the drive signal, thereby improving the accuracy and reliability of the constant current signal output by the constant current control device.

[0028] Optional, Figure 2 This is a schematic diagram of another constant current control device provided in an embodiment of this application, as shown below. Figure 2 As shown, the control module 10 includes a controller 11 and an arithmetic module 12. The output terminal of the controller 11 is electrically connected to the input terminal of the arithmetic module 12. The controller 11 is used to regulate the waveform control signal provided to the arithmetic module 12 according to the preset signal and the current signal. The arithmetic module 12 is used to output a drive signal according to the waveform control signal.

[0029] The controller 11 includes a control chip, the arithmetic module 12 includes devices for information conversion or calculation, and the preset signal may include a digital signal corresponding to a fixed current value. The preset signal may be a fixed value, and the specific size can be set according to actual needs, without specific limitations here.

[0030] Specifically, the arithmetic module 12 outputs different drive signals under different waveform control signals. The controller 11 can have an internal storage module to store preset signals. The controller 11 compares the difference between the current signal and the preset signal. When the difference is significant and the current signal is greater than the preset signal, it indicates that the actual current flowing through the load is greater than the preset current. In this case, the controller 11 can lower the previously output waveform control signal and output it to the arithmetic module 12. The arithmetic module 12 and the constant current module 02 output an adjusted constant current signal based on the adjusted waveform control signal. The signal feedback module 40 continues to acquire the current signal flowing through the load under the adjusted waveform control signal and converts the analog current signal into a digital current signal, transmitting it to the controller 11. This allows the controller 11 to further adjust the waveform control signal based on the preset signal and the current signal until the difference between the current signal and the preset signal is within a preset range or the current signal is equal to the preset signal. Thus, by adjusting the constant current signal flowing through the load in real time through the signal feedback module 40, the controller 11, and the arithmetic module 12, the stability of the current signal flowing through the load can be improved.

[0031] In one possible implementation, Figure 3 A schematic diagram of another constant current control device provided in the embodiments of this application is shown below. Figure 3 As shown, the arithmetic module 12 includes a digital frequency synthesizer 121, a digital-to-analog converter 122, and a multiplier 123. The output terminal of the controller 11 is electrically connected to the input terminals of the digital frequency synthesizer 121 and the digital-to-analog converter 122, respectively; the first input terminal of the multiplier 123 is electrically connected to the output terminal of the digital frequency synthesizer 121, the second input terminal of the multiplier 123 is electrically connected to the output terminal of the digital-to-analog converter 122, and the multiplication output terminal of the multiplier 123 is electrically connected to the input terminal of the arithmetic constant current module 02.

[0032] In one possible implementation, the waveform control signal includes waveform generation parameters and amplitude modulation digital control signals. The controller 11 provides waveform generation parameters (exemplary waveform information such as waveform, amplitude, and period) to the digital frequency synthesizer 121, which generates a waveform signal based on these parameters. The controller 11 provides amplitude modulation digital control signals to the digital-to-analog converter 122, which converts the amplitude modulation digital control signal into an analog control signal for amplitude adjustment. A multiplier 123 performs a multiplication operation between the waveform signal provided by the digital frequency synthesizer 121 and the analog control signal provided by the digital-to-analog converter 122 to adjust the amplitude of the waveform signal. Thus, by configuring the digital frequency synthesizer 121, the digital-to-analog converter 122, and the multiplier 123, only the amplitude of the waveform signal provided by the digital frequency synthesizer 121 is adjusted, resulting in zero phase offset, avoiding phase errors, and improving adjustment accuracy and ease of use.

[0033] In one possible implementation, Figure 11 This is a schematic diagram of a multiplication operator provided in an embodiment of this application, with reference to... Figure 3 and Figure 11 The multiplier unit 123 includes a multiplier 1231 and a phase-locked loop (PLL) 1232. The first input terminal IN1 of the multiplier 1231 is electrically connected to the output terminal of the digital frequency synthesizer 121, and the second input terminal IN2 of the multiplier 1231 is electrically connected to the output terminal of the digital-to-analog converter 122. The output terminal of the multiplier 1231 is electrically connected to the modulation signal input terminal T1 of the PLL 1232. The reference terminal T2 of the PLL 1232 is electrically connected to the output terminal of the digital frequency synthesizer 121, and the feedback terminal T3 of the PLL 1232 is electrically connected to the output terminal of the PLL 1232. The PLL 1232 is used to adjust the output drive signal according to the target phase provided by the digital frequency synthesizer 121, the feedback phase provided by the feedback terminal T3, and the modulation phase provided by the multiplier 1231. The phase of the drive signal is equal to the target phase.

[0034] For example, when the digital frequency synthesizer 121 and the digital-to-analog converter 122 first provide signals to the multiplier 1231, there is no feedback signal at the feedback terminal T3 of the phase-locked loop 1232. The waveform signal provided by the digital frequency synthesizer 121 includes the target phase, and the digital-to-analog converter 122 provides the amplitude control signal. The phase of the modulated signal after the multiplier 1231 performs multiplication based on the waveform signal and the amplitude control signal may differ from the target phase. Therefore, by setting up the phase-locked loop 1232, the phase-locked loop 1232 can obtain the target phase and the modulation phase of the modulated signal, calculate the phase difference between the two, convert the phase difference into an error voltage signal, perform low-pass filtering on the error voltage signal and integrate it to obtain the target frequency, and then obtain the target phase based on the target frequency. Finally, based on the amplitude of the modulated signal, the target frequency, and the target phase, a drive signal with a phase equal to the target phase is obtained. When the output terminal of the phase-locked loop 1232 outputs a drive signal, the feedback terminal T3 of the phase-locked loop 1232 can receive the feedback signal. Then, the feedback phase in the feedback signal is compared with the target phase. The processing principle can be referred to the above description to make the phase of the adjusted output drive signal equal to the target phase, thereby reducing the large phase change of the drive signal after the signal passes through the multiplier 1231, which leads to oscillation and other problems, and improving the working stability of the multiplier 123.

[0035] In one possible implementation, the multiplier includes a multiplier and a phase shifter. The first input of the multiplier is electrically connected to the output of a digital frequency synthesizer, the second input of the multiplier is electrically connected to the output of a digital-to-analog converter, and the output of the multiplier is electrically connected to the phase-shifting modulation signal input of the phase shifter. The phase-shifting reference terminal of the phase shifter is electrically connected to the output of the digital frequency synthesizer. The phase shifter is used to make the phase of the driving signal output by the multiplier the same as the phase of the waveform signal output by the digital frequency synthesizer, thereby keeping the amplitude and frequency of the driving signal output by the multiplier unchanged while making the phase of the driving signal output by the multiplier the same as the phase of the waveform signal output by the digital frequency synthesizer.

[0036] Optionally, the controller 11 is specifically used to, when the absolute value of the difference between the preset signal and the current signal is greater than zero and less than a first preset value, and when the preset signal is greater than the current signal, use the sum of the first control signal and the first step value as the control signal provided to the digital-to-analog converter for this operation; or, When the absolute value of the difference between the preset signal and the current signal is greater than zero and less than the first preset value, and when the preset signal is less than the current signal, the difference between the first control signal and the first preset value is used as the control signal provided to the digital-to-analog converter.

[0037] The first control signal is the control signal previously provided to the digital-to-analog converter. The first step value can be a fixed value or a non-fixed value. The first step value can be a binary value and can be set according to actual needs. No specific limitation is made here.

[0038] Specifically, if the absolute value of the difference between the preset signal and the current signal is greater than zero and less than the first preset value, and the preset signal is greater than the current signal, it indicates that the difference between the current signal and the preset signal is small. In this case, the sum of the first control signal and the first step value provided to the digital-to-analog converter 122 last time can be used as the control signal provided to the digital-to-analog converter 122 this time. Under the action of the control signal, the current signal fed back next time can be increased until the current signal is equal to the preset signal, which is beneficial to improving the constancy of the current signal flowing through the load.

[0039] Correspondingly, if the absolute value of the difference between the preset signal and the current signal is greater than zero and less than the first preset value, and the preset signal is less than the current signal, it indicates that the difference between the current signal and the preset signal is small. At this time, the difference between the first control signal and the first step value provided to the digital-to-analog converter 122 last time can be used as the control signal provided to the digital-to-analog converter 122 this time. Under the action of the control signal, the current signal fed back next time can be reduced until the current signal is equal to the preset signal, so as to improve the constancy of the current signal flowing through the load.

[0040] Optionally, the controller 11 is further configured to use the sum of the first control signal and the second step value as the control signal provided to the digital-to-analog converter in the following cases: the absolute value of the difference between the preset signal and the current signal is greater than a second preset value, and the preset signal is greater than the current signal; or, When the absolute value of the difference between the preset signal and the current signal is greater than the second preset value, and when the preset signal is less than the current signal, the difference between the first control signal and the second step value is used as the control signal provided to the digital-to-analog converter this time.

[0041] Among them, the second preset value is greater than the first preset value, and the second step value is greater than the first step value.

[0042] Specifically, if the difference between the preset signal and the current signal is greater than the second preset value, and the preset signal is greater than the current signal, it indicates that the difference between the current signal and the preset signal is large. In this case, the sum of the first control signal and the second step value previously provided to the digital-to-analog converter 122 can be used as the control signal provided to the digital-to-analog converter 122 this time. Under the action of this control signal, the current signal fed back next time can be rapidly increased until the current signal is equal to the preset signal, which is beneficial to improving the control efficiency of the current signal flowing through the load.

[0043] Correspondingly, if the absolute value of the difference between the preset signal and the current signal is greater than the second preset value, and the preset signal is less than the current signal, it indicates that the difference between the current signal and the preset signal is large. At this time, the difference between the first control signal and the first step preset value provided to the digital-to-analog converter 122 last time can be used as the control signal provided to the digital-to-analog converter 122 this time. Under the action of the control signal, the current signal fed back next time can be reduced until the current signal is equal to the preset signal, which is beneficial to improving the constancy of the current signal flowing through the load.

[0044] In one possible implementation, Figure 4 A schematic diagram of another constant current control device provided in the embodiments of this application is shown below. Figure 4 As shown, the operational constant current module 02 includes an operational constant current circuit 20 and a transformer circuit 30. The feedback terminal of the operational constant current circuit 20 is electrically connected to the output terminal of the transformer circuit 30, and the output terminal of the operational constant current circuit 20 is electrically connected to the input terminal of the transformer circuit 30. The operational constant current circuit 20 is used to regulate the excitation signal provided to the input terminal of the transformer circuit 30 according to the drive signal and the feedback signal provided by the feedback terminal. The transformer circuit 30 is used to output a constant current signal to the load output terminal P according to the excitation signal. The transformer circuit 30 may include a boost circuit and a buck circuit.

[0045] Specifically, the operational constant current circuit 20 includes a feedback terminal electrically connected to the output terminal of the transformer circuit 30. This feedback terminal compares the current excitation signal with the excitation signal determined based on the drive signal, and then outputs an excitation signal corresponding to the drive signal, thus improving the accuracy and reliability of the excitation signal. After receiving the excitation signal, the transformer circuit 30 can boost the excitation signal before outputting it to the load output terminal P, increasing the maximum output voltage value of the constant current signal output to the load output terminal P. This allows the constant current control device to adapt to loads with different impedances, improving its practicality and reliability. Thus, by setting up dual closed-loop feedback to improve the accuracy and reliability of the constant current signal output by the constant current control device, the transformer circuit 30 boosts or bucks the excitation signal provided by the operational constant current circuit 20, enabling the constant current control device to provide different constant current signals to loads with different impedances, thereby driving different loads and improving the practicality of the constant current control device. The current signal in the constant current signal is the same.

[0046] In one possible implementation, transformer circuit 30 includes a boost circuit.

[0047] The boost circuit includes a boost converter, etc.

[0048] The excitation signal provided by the operational constant current circuit 20 has a limited maximum voltage capacity and cannot adapt to different load impedance values. By incorporating a boost circuit into the transformer circuit 30, the excitation signal is boosted to output a constant current signal with a larger voltage capacity, thus adapting to different load impedance values ​​and improving the practicality of the constant current control device. The boost factor of the boost circuit can be set according to actual needs; for example, the boost factor is 4 times, but other factors are also possible, and no specific limitation is made here.

[0049] It is understandable that when the load is the human body surface, the impedance value of the human body surface will fluctuate under different temperature or humidity environments. By setting up a boost circuit, the voltage waveform of the load can be kept undistorted under the premise that the current value flowing through the impedance of the human body surface is constant, thereby improving the ability of the constant current control device to drive different load impedances.

[0050] Optional, Figure 5 This is a schematic diagram of the structure of a constant current control device provided in an embodiment of this application, as shown below. Figure 5 As shown, the control module 10 also includes a digital isolation module 60, which is electrically connected between the controller 11 and the arithmetic module 12.

[0051] The digital isolation module 60 includes isolation chips or magnetic coupling isolators, which can be configured according to actual needs, and no specific limitations are made here.

[0052] Specifically, because the control module 10 receives a relatively high supply voltage, when the controller 11 experiences a short circuit or other fault, the supply voltage on the control module 10 side may be transmitted to the arithmetic module 12 and the constant current module 02 through the controller 11, potentially burning out the arithmetic module 12 or the constant current module 02 and affecting the normal operation of the constant current control device. Therefore, by setting a digital isolation module 60 between the controller 11 and the arithmetic module 12 to isolate the high-voltage supply signal on the controller 11 side from the arithmetic module 12 and the constant current module 02, it is beneficial to prevent the high-voltage supply signal on the controller 11 side from being transmitted to the arithmetic module 12 and the constant current module 02, improving the safety of the arithmetic module 12 and the constant current module 02, and thus improving the overall operational safety of the constant current control device. The high-voltage supply voltage can be a 202V AC signal.

[0053] Optional, Figure 6 This is a schematic diagram of another constant current control device provided in an embodiment of this application, as shown below. Figure 6As shown, the signal feedback module 40 includes a sampling circuit 41 and an analog-to-digital converter module 42; the sampling circuit 41 is connected in series with the load at the load output terminal P, the sampling terminal of the sampling circuit 41 is electrically connected to the input terminal of the analog-to-digital converter module 42, and the output terminal of the analog-to-digital converter module 42 is electrically connected to the input terminal of the controller 11.

[0054] The sampling circuit 41 may include components such as sampling resistors, which can be set according to actual needs, and no specific limitations are made here.

[0055] Specifically, when the constant current control device provides a constant current signal to the load, since the sampling circuit 41 is connected in series with the load and to the load output terminal P, the current flowing through the sampling circuit 41 is the same as the current signal flowing through the load. The sampling circuit 41 transmits the collected current signal to the analog-to-digital converter module 42 through the sampling terminal. The analog-to-digital converter module 42 is used to convert the current signal into a digital detection signal so that it can be recognized and processed by the controller 11.

[0056] In an optional embodiment, the sampling circuit 41 includes a sampling resistor. The sampling circuit 41 collects the voltage across the sampling resistor and transmits the ratio of the voltage to the sampling resistor as the collected current signal to the analog-to-digital conversion module 42.

[0057] Optional, Figure 7 A schematic diagram of another constant current control device provided in the embodiments of this application is shown below. Figure 7 As shown, the constant current control device also includes a feedback isolation module 43, which is electrically connected between the analog-to-digital conversion module 42 and the controller 11.

[0058] The feedback isolation module 43 includes an isolation chip or a magnetic coupling isolator, which can be configured according to actual needs, and no specific limitation is made here.

[0059] Specifically, because the control module 10 receives a relatively high supply voltage, when the controller 11 experiences a short circuit or other fault, the supply voltage on the control module 10 side may be transmitted to the analog-to-digital converter (ADC) 42 through the controller 11, potentially burning out the ADC 42 and affecting the normal operation of the constant current control device. Therefore, by setting a feedback isolation module 43 between the controller 11 and the ADC 42, the high-voltage signal on the controller 11 side is isolated from the ADC 42, preventing the high-voltage supply signal on the controller 11 side from being transmitted to the ADC 42, thus improving the operational safety and reliability of the ADC 42, and consequently improving the overall operational safety of the constant current control device.

[0060] Optional, Figure 8 A schematic diagram of another constant current control device provided in the embodiments of this application is shown below. Figure 8As shown, the constant current control device also includes a power isolation circuit 80; the input terminal of the power isolation circuit 80 is electrically connected to the power supply 50, and the output terminal of the power isolation circuit 80 is electrically connected to each power supply terminal of the operational constant current module 02 and the signal feedback module 40.

[0061] The power isolation circuit 80 includes isolation devices such as transformers, which can be configured according to actual needs, and no specific limitations are made here.

[0062] Specifically, the power supply 50 provides a relatively high supply voltage, while the operational constant current module 02 and the signal feedback module 40 require a relatively low supply voltage. If the high supply voltage provided by the power supply 50 is transmitted to the operational constant current module 02 and the signal feedback module 40 through the power supply module 70, it will burn out the operational constant current module 02 and the signal feedback module 40. Therefore, a power isolation circuit 80 is set between the power supply 50 and the operational constant current module 02 and the signal feedback module 40 to isolate the supply voltage provided by the power supply 50 from the operational constant current module 02 and the signal feedback module 40, thereby improving the power supply safety and operational reliability of the operational constant current module 02 and the signal feedback module 40.

[0063] Optional, Figure 9 This is a schematic diagram of the structure of a constant current control device provided in an embodiment of this application, as shown below. Figure 9 As shown, the power isolation module 80 includes an isolation circuit 81 and at least one step-down circuit 71; the input terminal of the isolation circuit 81 is electrically connected to the power supply 50, the output terminal D1 of the isolation circuit 81 is electrically connected to the input terminal of each step-down circuit 71, and the output terminal of each step-down circuit 71 is electrically connected to the power supply terminal of the operational constant current module 02 and the power supply terminal of the signal feedback module 40, respectively.

[0064] The step-down circuit 71 includes a step-down transformer, etc.

[0065] Specifically, when the power supply voltages required by the operational constant current module 02 and the signal feedback module 40 are the same, the power isolation module 80 can have only one step-down circuit 71. This allows the power signals stepped down by the step-down circuit 71 to be transmitted to both the operational constant current module 02 and the signal feedback module 40, simplifying the structure of the power module 70. When the power supply voltages required by the operational constant current module 02 and the signal feedback module 40 are different, the power module 70 can include two step-down circuits 71, each corresponding to the operational constant current module 02 and the signal feedback module 40 respectively. This provides the required power signals to both modules, improving the accuracy and reliability of the power signal supply.

[0066] In one possible implementation, Figure 10 A schematic diagram of the circuit structure of an operational constant current circuit provided in an embodiment of this application is shown below. Figure 10 As shown, the operational constant current circuit 20 includes a feedback circuit 21 and a comparator 22; the first comparison terminal In1 of the comparator 22 is electrically connected to the output terminal of the control module 10, the second comparison terminal In2 of the comparator 22 is electrically connected to the output terminal of the feedback circuit 21, the input terminal 0- of the feedback circuit 21 is electrically connected to the output terminal of the transformer circuit 30, and the comparison output terminal 0+ of the comparator 22 is electrically connected to the input terminal of the transformer circuit 30.

[0067] In one possible implementation, the feedback circuit 21 may include a first resistor R1, a second resistor R2, and a third resistor R3. One end of the parallel connection of the first resistor R1 and the second resistor R2 is electrically connected to one end of the third resistor R3 and the negative output terminal O- of the operational constant current circuit 20, respectively. The other end of the parallel connection of the first resistor R1 and the second resistor R2 is electrically connected to the ground terminal GND. The other end of the third resistor R3 is electrically connected to the second comparison terminal of the comparator 22. The first resistor R1 and the second resistor R2 in the feedback circuit 21 are connected in series with the output terminal of the transformer circuit 30. The voltage at the end of the parallel connection of the first resistor R1 and the second resistor R2 that is electrically connected to the third resistor R3 can change with the excitation signal output by the comparator 22, thereby transmitting a feedback signal corresponding to the current excitation signal to the second comparison terminal through the third resistor R3. Provided that the feedback circuit 21 can receive the feedback signal corresponding to the currently output excitation signal, the specific circuit structure of the feedback circuit 21 can also be other, and is not specifically limited here.

[0068] In one possible implementation, R3 / ((R1 / / R2)+R3) is equal to N2 / N1, where N1 is the number of turns at the output of the transformer circuit and N2 is the number of turns at the input of the transformer circuit. Since current is inversely proportional to the number of turns, the more turns the transformer circuit uses for boosting, the smaller the current at the output of the transformer circuit. Therefore, after the current at the input of the transformer circuit 30 is input from the input 0 of the feedback circuit 21, it is shunted through R1 / / R2 to make the current at the output of the feedback circuit 21 equal to the current output of the transformer circuit 30, thus ensuring constant current in the constant current control device.

[0069] Specifically, the feedback terminal of the feedback circuit 21 is electrically connected to the output terminal of the operational constant current circuit 20 to receive the feedback signal corresponding to the current excitation signal. The comparator 22 is used to compare the feedback signal with the drive signal provided by the control module 10. When the feedback signal is less than the drive signal, the excitation signal output by the comparator is greater than the previous output excitation signal. When the feedback signal is greater than the drive signal, the excitation signal output by the comparator is less than the previous output excitation signal, so that the output excitation signal corresponds to the drive signal provided by the control module 10, thereby improving the accuracy of the excitation signal.

[0070] Based on the same inventive concept, this application also provides an ablation device, which includes the constant current control device provided in any embodiment of this application. Therefore, the ablation device possesses the technical features of the constant current control device provided in the embodiments of this application and can achieve the beneficial effects of the constant current control device provided in the embodiments of this application. The similarities can be referred to the above description of the constant current control device provided in the embodiments of this application, and will not be repeated here.

[0071] Note that the above description is merely a preferred embodiment and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of this application, the scope of which is determined by the scope of the appended claims.

Claims

1. A constant current control device, characterized in that, include: Control module, constant current operation module, signal feedback module, and load output terminal; The load output terminal is used to connect to the load; The output terminal of the control module is electrically connected to the input terminal of the operational constant current module, and the control module is used to provide a drive signal to the operational constant current module; The constant current module is used to output a constant current signal to the load output terminal according to the drive signal; The input terminal of the control module is electrically connected to the signal feedback module; the signal feedback module is used to acquire the current signal flowing through the load, and the control module is used to adjust the drive signal provided to the operational constant current module according to the preset signal and the current signal. The control module includes: a controller and a processing module; the output terminal of the controller is electrically connected to the input terminal of the processing module; The computing module includes: a digital frequency synthesizer, a digital-to-analog converter, and a multiplier; The output terminal of the controller is electrically connected to the input terminals of the digital frequency synthesizer and the digital-to-analog converter, respectively. The first input terminal of the multiplier is electrically connected to the output terminal of the digital frequency synthesizer, the second input terminal of the multiplier is electrically connected to the output terminal of the digital-to-analog converter, and the multiplication output terminal of the multiplier is electrically connected to the input terminal of the constant current module. The multiplication unit includes a multiplier and a phase-locked loop; The first input terminal of the multiplier is electrically connected to the output terminal of the digital frequency synthesizer, the second input terminal of the multiplier is electrically connected to the output terminal of the digital-to-analog converter, and the output terminal of the multiplier is electrically connected to the modulation signal input terminal of the phase-locked loop. The reference terminal of the phase-locked loop is electrically connected to the output terminal of the digital frequency synthesizer, and the feedback terminal of the phase-locked loop is electrically connected to the output terminal of the phase-locked loop; the phase-locked loop is used to adjust the output driving signal according to the target phase provided by the digital frequency synthesizer, the feedback phase provided by the feedback terminal, and the modulation phase provided by the multiplier; Wherein, the phase of the driving signal is equal to the phase of the target.

2. The constant current control device according to claim 1, characterized in that, The controller is used to adjust the waveform control signal provided to the arithmetic module according to the preset signal and the current signal, and the arithmetic module is used to output the drive signal according to the waveform control signal.

3. The constant current control device according to claim 1, characterized in that, The controller is specifically used to, when the absolute value of the difference between the preset signal and the current signal is greater than zero and less than a first preset value, and when the preset signal is greater than the current signal, use the sum of the first control signal and the first preset value as the control signal provided to the digital-to-analog converter this time; the first control signal is the control signal previously provided to the digital-to-analog converter; or, When the absolute value of the difference between the preset signal and the current signal is greater than zero and less than the first preset value, and when the preset signal is less than the current signal, the difference between the first control signal and the first preset value is used as the control signal provided to the digital-to-analog converter this time.

4. The constant current control device according to claim 3, characterized in that, The controller is further specifically configured to, when the absolute value of the difference between the preset signal and the current signal is greater than a second preset value, and when the preset signal is greater than the current signal, use the sum of the first control signal and the second step value as the control signal provided to the digital-to-analog converter this time; or, If the absolute value of the difference between the preset signal and the current signal is greater than the second preset value, and the preset signal is less than the current signal, the difference between the first control signal and the second step value shall be used as the control signal provided to the digital-to-analog converter in this instance. Wherein, the second preset value is greater than the first preset value, and the second step value is greater than the first step value.

5. The constant current control device according to claim 1, characterized in that, The operational constant current module includes: an operational constant current circuit and a transformer circuit; The feedback terminal of the operational constant current circuit is electrically connected to the output terminal of the transformer circuit, and the output terminal of the operational constant current circuit is electrically connected to the input terminal of the transformer circuit. The operational constant current circuit is used to regulate the excitation signal provided to the input terminal of the transformer circuit according to the driving signal and the feedback signal provided by the feedback terminal of the operational constant current circuit. The transformer circuit is used to output a constant current signal to the load output terminal according to the excitation signal.

6. The constant current control device according to claim 2, characterized in that, The control module further includes: a digital isolation module; The digital isolation module is electrically connected between the controller and the computing module.

7. The constant current control device according to claim 6, characterized in that, The signal feedback module includes: a sampling circuit and an analog-to-digital conversion module; The sampling circuit is connected in series with the load at the load output terminal. The sampling output terminal of the sampling circuit is electrically connected to the input terminal of the analog-to-digital converter module, and the output terminal of the analog-to-digital converter module is electrically connected to the input terminal of the controller.

8. The constant current control device according to claim 7, characterized in that, Also includes: Feedback isolation module; The feedback isolation module is electrically connected between the analog-to-digital conversion module and the controller.

9. The constant current control device according to claim 1, characterized in that, Also includes: Power isolation module; The input terminal of the power isolation module is connected to the power supply, and the output terminal of the power isolation module is electrically connected to the power supply terminals of the operational constant current module and the signal feedback module.

10. The constant current control device according to claim 9, characterized in that, The power isolation module includes: an isolation circuit and at least one step-down circuit; The input terminal of the isolation circuit is electrically connected to the power supply, the output terminal of the isolation circuit is electrically connected to the input terminal of each of the step-down circuits, and the output terminal of each of the step-down circuits is electrically connected to the power supply terminal of the operational constant current module and the power supply terminal of the signal feedback module, respectively.

11. The constant current control device according to claim 5, characterized in that, The operational constant current circuit includes a feedback circuit and a comparator; The first comparison terminal of the comparator is electrically connected to the output terminal of the control module, the second comparison terminal of the comparator is electrically connected to the output terminal of the feedback circuit, the input terminal of the feedback circuit is electrically connected to the output terminal of the transformer circuit, and the comparison output terminal of the comparator is electrically connected to the input terminal of the transformer circuit.

12. The constant current control device according to claim 5, characterized in that, The transformer circuit includes a boost circuit.

13. An ablation device, characterized in that, Includes the constant current control device according to any one of claims 1 to 12.

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