Constant current control device and ablation equipment

Abstract

The invention discloses a constant current control device and ablation equipment. The constant current control device comprises a control module, an operation constant current module, a signal feedback module and a load output end. The output end of the control module is electrically connected with the input end of the operation constant-current module, and the control module is used for providing a driving signal for the operation constant-current module; the operation constant current module is used for outputting a constant current signal to a load output end according to the driving signal and a feedback signal provided by a feedback end; the input end of the control module is electrically connected with the signal feedback module; the signal feedback module is used for acquiring a current signal flowing through a load, and the control module is used for adjusting a driving signal provided for the operation constant current module according to a preset signal and a digital detection signal. According to the technical scheme, the constant current signal matched with the impedance value of the load can be output, and the practicability and reliability of the constant current control device can be improved.

Description

Technical Field

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

[0002] A constant current signal circuit is a circuit used to generate a specific frequency, amplitude, and waveform. It consists of a signal generator and an amplifier, and is often used in positioning, measurement, or communication systems.

[0003] Current technology's constant current signal circuits typically use an op amp module as a constant current source to directly drive the output. However, for high-impedance loads, the constant current range and the maximum undistorted load impedance parameters 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 solution is that the power supply range of the op amp module is limited. If 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 be clipped and distorted, causing the current flowing through the load to be less than the constant current value. At this time, the constant current signal circuit will limit the current flowing through the load, resulting in a narrow constant current range and an inability to drive high-impedance loads. Summary of the Invention

[0004] The present application provides a constant current control device and an ablation device, which can output a constant current signal that matches the impedance value of the load, so as to improve the practicality and reliability of the constant current control device.

[0005] In a first aspect, the present application provides a constant current control device, comprising: a control module, a calculation constant current module, a voltage conversion circuit, a signal feedback module, and a load output terminal;

[0006] The load output terminal is used to connect a load;

[0007] The output end of the control module is electrically connected to the input end of the operation constant current module, and the control module is used to provide a driving signal to the operation constant current module;

[0008] The computational constant current module is configured to output a constant current signal to the load output terminal according to the drive signal and the feedback signal provided by the feedback terminal;

[0009] The input end of the control module is electrically connected to the signal feedback module; the signal feedback module is used to obtain the current signal flowing through the load, and the control module is used to adjust the drive signal provided to the operation constant current module according to the preset signal and the current signal.

[0010] Optionally, the control module includes: a controller and a calculation module;

[0011] The output end of the controller is electrically connected to the input end of the operation module. The controller is used to adjust the waveform control signal provided to the operation module according to the preset signal and the digital detection signal. The operation module is used to output the drive signal according to the waveform control signal.

[0012] Optionally, the operation module includes: a digital frequency synthesizer, a digital-to-analog converter and a multiplier;

[0013] The output end of the controller is electrically connected to the input end of the digital frequency synthesizer and the input end of the digital-to-analog converter respectively;

[0014] The first input end of the multiplier is electrically connected to the output end of the digital frequency synthesizer, the second input end of the multiplier is electrically connected to the output end of the digital-to-analog converter, and the multiplication output end of the multiplier is electrically connected to the input end of the operation constant current module.

[0015] Optionally, the multiplier includes a multiplier and a phase-locked loop;

[0016] 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;

[0017] 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 drive 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;

[0018] The phase of the driving signal is equal to the target phase.

[0019] Optionally, the controller is specifically configured to, when an absolute value of a 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 a sum of a first control signal and a first step value as the control signal provided to the digital-to-analog converter this time; the first control signal is the control signal provided to the digital-to-analog converter last time;

[0020] or,

[0021] When the absolute value of the difference between the preset signal and the digital detection signal is greater than zero and less than the first preset value, and the preset signal is less than the current signal, the difference between the first control signal and the first step value is used as the control signal provided to the digital-to-analog converter this time.

[0022] Optionally, 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 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,

[0023] When 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 is used as the control signal provided to the digital-to-analog converter this time;

[0024] The second preset value is greater than the first preset value, and the second step value is greater than the first step value.

[0025] Optionally, the computational constant current module includes: a computational constant current circuit and a voltage conversion circuit;

[0026] The feedback end and output end of the operational constant current circuit are electrically connected to the input end of the transformer circuit respectively; the operational constant current circuit is used to regulate the excitation signal provided to the input end of the transformer circuit according to the drive signal and the feedback signal provided by the feedback end; the transformer circuit is used to output a constant current signal to the load output end according to the excitation signal.

[0027] Optionally, the control module further includes: a digital isolation module;

[0028] The digital isolation module is electrically connected between the controller and the operation module.

[0029] Optionally, the signal feedback module includes: a sampling circuit and an analog-to-digital conversion module;

[0030] The sampling circuit and the load are connected in series at the load output end, the sampling output end of the sampling circuit is electrically connected to the input end of the analog-to-digital conversion module, and the output end of the analog-to-digital conversion module is electrically connected to the input end of the controller.

[0031] Optionally, the constant current control device further includes: a feedback isolation module;

[0032] The feedback isolation module is electrically connected between the analog-to-digital conversion module and the controller.

[0033] Optionally, the constant current control device further includes: a power isolation circuit;

[0034] The input end of the power isolation circuit is electrically connected to the power supply, and the output end of the power isolation circuit is electrically connected to the power supply ends of the operation constant current module and the signal feedback module.

[0035] Optionally, the power module further includes: an isolation circuit and at least one step-down circuit;

[0036] The input end of the isolation circuit is electrically connected to the power supply, the output end of the isolation circuit is electrically connected to the input end of each step-down circuit, and each output end of each step-down circuit is electrically connected to the power supply end of the operational constant current module and the power supply end of the signal feedback module respectively.

[0037] Optionally, the computational constant current module includes a feedback circuit and a comparator;

[0038] 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.

[0039] Optionally, the voltage conversion circuit includes a boost circuit.

[0040] In a second aspect, the present application provides an ablation device, comprising the constant current control device described in the first aspect.

[0041] The technical solution of the embodiment of the present application is to set up a signal feedback module so that the control module can regulate the drive signal provided to the operation 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 operation constant current module can output a constant current signal corresponding to the preset signal under the action of the drive signal, which is conducive to improving the accuracy and reliability of the constant current signal output by the constant current control device. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic structural diagram of a constant current control device provided in an embodiment of the present application;

[0043] Figure 2 A schematic structural diagram of another constant current control device provided in an embodiment of the present application;

[0044] Figure 3 A structural diagram of another constant current control device provided in an embodiment of the present application;

[0045] Figure 4 A schematic structural diagram of another constant current control device provided in an embodiment of the present application;

[0046] Figure 5A schematic structural diagram of a constant current control device provided in an embodiment of the present application;

[0047] Figure 6 A schematic structural diagram of another constant current control device provided in an embodiment of the present application;

[0048] Figure 7 A structural diagram of another constant current control device provided in an embodiment of the present application;

[0049] Figure 8 A schematic structural diagram of another constant current control device provided in an embodiment of the present application;

[0050] Figure 9 A schematic structural diagram of a constant current control device provided in an embodiment of the present application;

[0051] Figure 10 A schematic diagram of the circuit structure of an operational constant current circuit provided in an embodiment of the present application.

[0052] Figure 11 A schematic diagram of the structure of a multiplier provided in an embodiment of the present application. DETAILED DESCRIPTION

[0053] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present application and are not intended to limit the present application. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions of the present application, not all of the structures.

[0054] Figure 1 A structural diagram of a constant current control device provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the constant current control device includes a control module 10, an operation constant current module 02, a signal feedback module 40 and a load output terminal P. The load output terminal P is used to connect a load. The output terminal of the control module 10 is electrically connected to the input terminal of the operation constant current module 02, and the control module 10 is used to provide a driving signal to the operation constant current module 02. The operation constant current module 02 is used to output a constant current signal to the load output terminal P according to the driving signal. The input terminal of the control module 10 is electrically connected to the signal feedback module 40; the signal feedback module 40 is used to obtain a current signal flowing through the load and transmit the current signal to the control module 10. The control module 10 is used to adjust the driving signal provided to the operation constant current module 02 according to the preset signal and the current signal.

[0055] Wherein, load includes human body surface impedance or other equipment with certain impedance value, etc., and can be set according to actual needs. Constant current signal includes voltage signal and current signal, and the current signal of constant current signal at different moments is the same. The driving signal that control module 10 provides to operation constant current module 02 includes AC voltage signal, etc., operation constant current module 02 includes devices such as amplifier, and signal feedback module 40 may include devices such as resistor. The specific circuit structure of control module 10, operation constant current module 02 and signal feedback module 40 can all be designed according to actual needs. Under the premise of being able to meet their respective functions, the embodiment of the present application does not limit the specific structure of control module 10, operation constant current module 02 and signal feedback module 40.

[0056] Specifically, after the control module 10 provides a driving signal to the operation constant current module 02, the operation constant current module 02 provides a constant current signal to the load output terminal P according to the driving signal, so that the current signal flowing through the load can be kept constant. When the load output terminal P of the constant current control device is electrically connected to the load and is in a working state, the signal feedback module 40 is used to obtain the analog current signal flowing through the load and convert the analog current signal into a digital current signal, and then transmit it to the control module 10, so that the control module 10 compares the digital current signal with the preset signal, and then adjusts the driving signal provided to the operation constant current module 02, so that the operation constant current module 02 can output a constant current signal corresponding to the preset signal according to the driving signal. Exemplarily, the preset signal is a digital signal corresponding to a current of 5A, and 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 adjust the driving signal outputted last time by a certain value as the driving signal to be outputted currently, so that the operation constant current module 02 outputs a constant current signal corresponding to the preset signal with a current of 5A according to the driving signal. In this way, by providing the signal feedback module, the accuracy and reliability of the constant current signal output by the constant current control device can be improved to drive different loads, which helps to improve the practicality of the constant current control device.

[0057] The technical solution of the embodiment of the present application is to set up a signal feedback module so that the control module can regulate the drive signal provided to the operation 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 operation 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.

[0058] Optional, Figure 2 A structural diagram of another constant current control device provided in an embodiment of the present application is shown in FIG. Figure 2As shown, the control module 10 includes a controller 11 and an operation module 12. The output end of the controller 11 is electrically connected to the input end of the operation module 12. The controller 11 is used to regulate the waveform control signal provided to the operation module 12 according to the preset signal and the current signal. The operation module 12 is used to output a drive signal according to the waveform control signal.

[0059] Among them, the controller 11 includes a control chip, etc., the operation module 12 includes a device with information conversion or calculation processing, etc., the preset signal may include a digital signal corresponding to a fixed current value, the preset signal can be a fixed numerical value, and the specific size can be set according to actual needs, and no specific limitation is made here.

[0060] Specifically, the operation module 12 outputs different drive signals under the action of different waveform control signals. A storage module can be set inside the controller 11 to store preset signals. The controller 11 compares the difference between the current signal and the preset signal. When the difference between the current signal and the preset signal is large and the current signal is greater than the preset signal, it indicates that the current signal actually flowing through the load is greater than the preset current corresponding to the preset signal. At this time, the controller 11 can lower the waveform control signal output last time and output it to the operation module 12. The operation module 12 and the operation constant current module 02 output an adjusted constant current signal according to the adjusted waveform control signal. The signal feedback module 40 continues to obtain the current signal flowing through the load under the action of the adjusted waveform control signal, and converts the analog current signal into a digital current signal and transmits it to the controller 11, so that the controller 11 further adjusts the waveform control signal according to the preset signal and the current signal until the difference between the current signal and the preset signal is within the preset range or the current signal is equal to the preset signal. In this way, the constant current signal flowing through the load is adjusted in real time through the signal feedback module 40 , the controller 11 and the operation module 12 , which is beneficial to improving the stability of the current signal flowing through the load.

[0061] In one possible implementation, Figure 3 A structural diagram of another constant current control device provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the operation module 12 includes a digital frequency synthesizer 121, a digital-to-analog converter 122, and a multiplier 123. The output end of the controller 11 is electrically connected to the input ends of the digital frequency synthesizer 121 and the digital-to-analog converter 122 respectively; the first input end of the multiplier 123 is electrically connected to the output end of the digital frequency synthesizer 121, the second input end of the multiplier 123 is electrically connected to the output end of the digital-to-analog converter 122, and the multiplication output end of the multiplier 123 is electrically connected to the input end of the operation constant current module 02.

[0062] In one possible implementation, the waveform control signal includes waveform generation parameters and an amplitude control digital control signal. The controller 11 provides the waveform generation parameters (for example, waveform information such as waveform, amplitude, and period) to the digital frequency synthesizer 121, and the digital frequency synthesizer 121 generates a waveform signal based on the waveform generation parameters. The controller 11 provides the amplitude control digital control signal to the digital-to-analog converter 122, and the digital-to-analog converter 122 converts the amplitude-adjusting digital control signal into an analog control signal for adjusting the amplitude. The multiplier 123 is used to multiply the waveform signal provided by the digital frequency synthesizer 121 with the analog control signal provided by the digital-to-analog converter 122 to adjust the amplitude of the waveform signal. In this way, by setting 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, the phase offset is zero, and the phase error is avoided, thereby improving the accuracy and simplicity of adjustment.

[0063] In one possible implementation, Figure 11 A schematic diagram of the structure of a multiplier provided in an embodiment of the present application, referring to Figure 3 and Figure 11 The multiplier 123 includes a multiplier 1231 and a phase-locked loop 1232. The first input terminal IN1 of the multiplier 1231 is electrically connected to the output terminal of the digital frequency synthesizer 121, the second input terminal IN2 of the multiplier 1231 is electrically connected to the output terminal of the digital-to-analog converter 122, and the output terminal of the multiplier 1231 is electrically connected to the modulation signal input terminal T1 of the phase-locked loop 1232. The reference terminal T2 of the phase-locked loop 1232 is electrically connected to the output terminal of the digital frequency synthesizer 121, and the feedback terminal T3 of the phase-locked loop 1232 is electrically connected to the output terminal of the phase-locked loop 1232. The phase-locked loop 1232 is configured to adjust the output drive signal based on 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.

[0064] For example, when the digital frequency synthesizer 121 and the digital-to-analog converter 122 provide a signal to the multiplier 1231 for the first time, 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 a target phase, and the digital-to-analog converter 122 provides an amplitude control signal. The phase of the modulated signal after the multiplier 1231 performs a multiplication operation 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 modulation 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 then integrate it to obtain the target frequency. Then, based on the target frequency, the target phase is obtained. Then, based on the amplitude of the modulation signal, the target frequency, and the target phase, a drive signal having a phase equal to the target phase is obtained. When the output end of the phase-locked loop 1232 outputs a driving signal, the feedback end T3 of the phase-locked loop 1232 can receive the feedback signal, and then compare the feedback phase in the feedback signal with the target phase. The processing principle can refer to the above description, so that the phase of the adjusted output driving signal is equal to the target phase, thereby reducing the problem of large phase changes of the driving signal after the signal passes through the multiplier 1231, resulting in oscillation and other problems, and improving the working stability of the multiplier 123.

[0065] In one possible implementation, the multiplier includes a multiplier and a phase shifter, wherein a first input terminal of the multiplier is electrically connected to an output terminal of a digital frequency synthesizer, a second input terminal of the multiplier is electrically connected to an output terminal of a digital-to-analog converter, and an output terminal of the multiplier is electrically connected to a phase-shifted modulation signal input terminal of the phase shifter; a phase-shifted reference terminal of the phase shifter is electrically connected to the output terminal of the digital frequency synthesizer, and the phase shifter is used to make the phase of a driving signal output by the multiplier identical to the phase of a 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 identical to the phase of the waveform signal output by the digital frequency synthesizer.

[0066] Optionally, the controller 11 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 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 this time; or,

[0067] 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 the preset signal is less than the current signal, the difference between the first control signal and the first step value is used as the control signal provided to the digital-to-analog converter this time.

[0068] Among them, the first control signal is the control signal provided to the digital-to-analog converter last time, the first step value can be a fixed value or a non-fixed value, and the first step value can be a binary value, which can be set according to actual needs and is not specifically limited here.

[0069] 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. At this time, 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, so that 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.

[0070] 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 provided to the digital-to-analog converter 122 last time and the first step value can be used as the control signal provided to the digital-to-analog converter 122 this time, so that 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.

[0071] Optionally, the controller 11 is further specifically configured to, when 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 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,

[0072] When 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 smaller 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.

[0073] The second preset value is greater than the first preset value, and the second step value is greater than the first step value.

[0074] 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 current signal and the preset signal are significantly different. In this case, the sum of the first control signal and the second 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 this control signal, the current signal fed back next time can be quickly 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.

[0075] 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 smaller than the current signal, it indicates that the current signal and the preset signal are relatively different. At this time, the difference between the first control signal provided to the digital-to-analog converter 122 last time and the first step value can be used as the control signal provided to the digital-to-analog converter 122 this time, so that 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.

[0076] In one possible implementation, Figure 4 A structural diagram of another constant current control device provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, the computational constant current module 02 includes a computational constant current circuit 20 and a voltage conversion circuit 30. The feedback terminal and output terminal of the computational constant current circuit 20 are electrically connected to the input terminal of the voltage conversion circuit 30, respectively. The computational constant current circuit 20 is used to regulate the excitation signal provided to the input terminal of the voltage conversion circuit 30 based on the drive signal and the feedback signal provided by the feedback terminal. The voltage conversion circuit 30 is used to output a constant current signal to the load output terminal P based on the excitation signal. The voltage conversion circuit 30 may include a boost circuit and a buck circuit.

[0077] Specifically, the operational constant current circuit 20 includes a feedback terminal electrically connected to the input terminal of the voltage transformer circuit 30, so as to compare the current excitation signal fed back by the feedback terminal with the excitation signal determined according to the drive signal, and then output an excitation signal corresponding to the drive signal, which helps to improve the accuracy and reliability of the excitation signal. After receiving the excitation signal, the voltage transformer circuit 30 can boost the excitation signal and output it to the load output terminal P to increase the maximum output voltage value of the constant current signal output to the load output terminal P, so that the constant current control device can adapt to loads with different impedances, which is conducive to improving the practicality and reliability of the constant current control device. In this way, by setting a double closed-loop feedback to improve the accuracy and reliability of the constant current signal output by the constant current control device, the voltage transformer circuit 30 boosts or steps down the excitation signal provided by the operational constant current circuit 20, so that the constant current control device can provide different constant current signals to loads with different impedances to drive different loads, which helps to improve the practicality of the constant current control device. The current signals in the constant current signals are the same.

[0078] In a possible implementation, the voltage transformation circuit 30 includes a voltage boost circuit.

[0079] Among them, the boost circuit includes a booster and the like.

[0080] The maximum voltage that can be carried in the excitation signal provided by the computational constant current circuit 20 is limited and cannot adapt to different load impedance values. By configuring the voltage conversion circuit 30 to include a boost circuit, the boost circuit then boosts the excitation signal and outputs a constant current signal with a larger carrying voltage, thereby 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 of the boost circuit is 4 times, but other factors are possible and are not specifically limited here.

[0081] It is understandable that when the load is the human body surface, the human body surface impedance value will fluctuate under different temperature or humidity environments. By setting up a boost circuit, the voltage waveform of the load can be ensured to be undistorted under the premise that the current value flowing through the human body surface impedance is constant, thereby improving the ability of the constant current control device to drive different load impedances.

[0082] Optional, Figure 5 A structural diagram of a constant current control device provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, the control module 10 further includes a digital isolation module 60 , which is electrically connected between the controller 11 and the operation module 12 .

[0083] The digital isolation module 60 includes an isolation chip or a magnetic coupling isolator, etc., and can be configured according to actual needs, which is not specifically limited here.

[0084] Specifically, since the power supply voltage received by the control module 10 is relatively large, when a fault such as a short circuit occurs in the controller 11, the power supply voltage on the control module 10 side may be transmitted through the controller 11 to the operation module 12 and the operation constant current module 02, thereby burning the operation module 12 or the operation constant current module 02, which may affect the normal operation of the constant current control device. Therefore, by providing a digital isolation module 60 between the controller 11 and the operation module 12 to isolate the high-voltage power supply signal on the controller 11 side from the operation module 12 and the operation constant current module 02, it is beneficial to avoid the high-voltage power supply signal on the controller 11 side from being transmitted to the operation module 12 and the operation constant current module 02, thereby improving the safety of the operation module 12 and the operation constant current module 02, and thus improving the overall working safety of the constant current control device. Among them, the high-voltage power supply voltage can be a 202V AC signal.

[0085] Optional, Figure 6 A structural diagram of another constant current control device provided in an embodiment of the present application is shown in FIG. Figure 6As shown, the signal feedback module 40 includes a sampling circuit 41 and an analog-to-digital conversion module 42; the sampling circuit 41 and the load are connected in series 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 conversion module 42, and the output terminal of the analog-to-digital conversion module 42 is electrically connected to the input terminal of the controller 11.

[0086] The sampling circuit 41 may include components such as a sampling resistor, and may be configured according to actual needs, which is not specifically limited here.

[0087] Specifically, when the constant current control device provides a constant current signal to the load, since sampling circuit 41 is connected in series with the load and the load output terminal P, the current flowing through sampling circuit 41 is the same as the current signal flowing through the load. Sampling circuit 41 transmits the collected current signal through the sampling terminal to analog-to-digital conversion module 42. Analog-to-digital conversion module 42 is used to convert the current signal into a digital detection signal for identification and processing by controller 11.

[0088] 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 .

[0089] Optional, Figure 7 A structural diagram of another constant current control device provided in an embodiment of the present application is shown in FIG. Figure 7 As shown, the constant current control device further includes a feedback isolation module 43 , which is electrically connected between the analog-to-digital conversion module 42 and the controller 11 .

[0090] The feedback isolation module 43 includes an isolation chip or a magnetic coupling isolator, etc., and can be configured according to actual needs, which is not specifically limited here.

[0091] Specifically, because the power supply voltage received by the control module 10 is relatively high, when a fault such as a short circuit occurs in the controller 11, the power supply voltage on the control module 10 side may be transmitted to the analog-to-digital conversion module 42 through the controller 11, thereby burning out the analog-to-digital conversion module 42 and affecting the normal operation of the constant current control device. Therefore, by providing a feedback isolation module 43 between the controller 11 and the analog-to-digital conversion module 42, the high-voltage signal on the controller 11 side is isolated from the analog-to-digital conversion module 42, thereby preventing the high-voltage power supply signal on the controller 11 side from being transmitted to the analog-to-digital conversion module 42, improving the operating safety and reliability of the analog-to-digital conversion module 42, and thereby improving the overall operating safety of the constant current control device.

[0092] Optional, Figure 8 A structural diagram of another constant current control device provided in an embodiment of the present application is shown in FIG. Figure 8As shown, the constant current control device also includes a power isolation circuit 80; the input end of the power isolation circuit 80 is electrically connected to the power supply 50, and the output end of the power isolation circuit 80 is electrically connected to the power supply ends of the operation constant current module 02 and the signal feedback module 40.

[0093] The power isolation circuit 80 includes isolation components such as a transformer, and can be configured according to actual needs, which are not specifically limited here.

[0094] Specifically, the power supply 50 provides a relatively high supply voltage, while the computing constant current module 02 and the signal feedback module 40 require a relatively low supply voltage. If the relatively high supply voltage provided by the power supply 50 is transmitted to the computing constant current module 02 and the signal feedback module 40 via the power supply module 70, the computing constant current module 02 and the signal feedback module 40 will be burned out. Therefore, a power isolation circuit 80 is provided between the power supply 50 and the computing constant current module 02 and the signal feedback module 40 to further isolate the supply voltage provided by the power supply 50 from the computing constant current module 02 and the signal feedback module 40, thereby improving the power supply safety and operational reliability of the computing constant current module 02 and the signal feedback module 40.

[0095] Optional, Figure 9 A structural diagram of a constant current control device provided in an embodiment of the present application is shown in FIG. Figure 9 As shown, the power isolation module 80 includes an isolation circuit 81 and at least one step-down circuit 71; the input end of the isolation circuit 81 is electrically connected to the power supply 50, the output end D1 of the isolation circuit 81 is electrically connected to the input end of each step-down circuit 71, and the output end of each step-down circuit 71 is electrically connected to the power supply end of the operation constant current module 02 and the power supply end of the signal feedback module 40 respectively.

[0096] The step-down circuit 71 includes a step-down transformer and the like.

[0097] Specifically, when the power supply voltages required by the operation constant current module 02 and the signal feedback module 40 are the same, the number of step-down circuits 71 provided in the power isolation module 80 can be one, so that the power supply signal after the step-down circuit 71 is respectively transmitted to the operation constant current module 02 and the signal feedback module 40, thereby simplifying the structure of the power supply module 70. When the power supply voltages required by the operation constant current module 02 and the signal feedback module 40 are different, the power supply module 70 can include two step-down circuits 71, so that each step-down circuit 71 corresponds to the operation constant current module 02 and the signal feedback module 40, respectively, to provide the required power supply signals to the operation constant current module 02 and the signal feedback module 40, respectively, thereby improving the accuracy and reliability of the supply of the power supply signal.

[0098] In one possible implementation, Figure 10 A schematic diagram of a circuit structure of an operational constant current circuit provided in an embodiment of the present application is shown in FIG. 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 input terminal of the voltage conversion circuit 30, and the comparison output terminal 0+ of the comparator 22 is electrically connected to the input terminal of the voltage conversion circuit 30.

[0099] 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 first resistor R1 and the second resistor R2 connected in parallel is electrically connected to one end of the third resistor R3 and the negative output terminal O- of the computational constant current circuit 20, respectively. The other end of the first resistor R1 and the second resistor R2 connected in parallel 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. In the feedback circuit 21, the first resistor R1 and the second resistor R2 are connected in series with the input terminal of the voltage conversion circuit 30. The voltage at one end of the first resistor R1 and the second resistor R2 connected in parallel and electrically connected to the third resistor R3 can change in accordance 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 a feedback signal corresponding to the currently output excitation signal, the specific circuit structure of the feedback circuit 21 may also be other and is not specifically limited herein.

[0100] 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 to boost the voltage, 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 to the input terminal 0 of the feedback circuit 21 minus the current at the input terminal, the current is divided by R1 / / R2, making the current at the output of the feedback circuit 21 equal to the current output of the transformer circuit 30, thereby ensuring a constant current in the constant current control device.

[0101] Specifically, the feedback end of the feedback circuit 21 is electrically connected to the output end of the operational constant current circuit 20 to receive a 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 excitation signal output last time. When the feedback signal is greater than the drive signal, the excitation signal output by the comparator is less than the excitation signal output last time, 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.

[0102] Based on the same inventive concept, the present application further provides an ablation device, comprising the constant current control device provided in any embodiment of the present application. Therefore, the ablation device possesses the technical features of the constant current control device provided in the embodiments of the present application and can achieve the beneficial effects of the constant current control device provided in the embodiments of the present application. For similarities, reference can be made to the above description of the constant current control device provided in the embodiments of the present application and will not be repeated here.

[0103] Note that the above are only preferred embodiments of the present application and the technical principles employed. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. A constant current control device, characterized in that: include: Control module, calculation constant current module, signal feedback module and load output terminal; The load output terminal is used to connect a load; The output end of the control module is electrically connected to the input end of the operation constant current module, and the control module is used to provide a driving signal to the operation constant current module; The computation constant current module is used to output a constant current signal to the load output terminal according to the driving signal; The input end of the control module is electrically connected to the signal feedback module; the signal feedback module is used to obtain the current signal flowing through the load, and the control module is used to adjust the drive signal provided to the operation constant current module according to the preset signal and the current signal.

2. The constant current control device according to claim 1, characterized in that: The control module includes: a controller and a calculation module; The output end of the controller is electrically connected to the input end of the operation module. The controller is used to regulate the waveform control signal provided to the operation module according to the preset signal and the current signal. The operation module is used to output the drive signal according to the waveform control signal.

3. The constant current control device according to claim 2, characterized in that: The operation module includes: a digital frequency synthesizer, a digital-to-analog converter and a multiplier; The output end of the controller is electrically connected to the input end of the digital frequency synthesizer and the input end of the digital-to-analog converter respectively; The first input end of the multiplier is electrically connected to the output end of the digital frequency synthesizer, the second input end of the multiplier is electrically connected to the output end of the digital-to-analog converter, and the multiplication output end of the multiplier is electrically connected to the input end of the operation constant current module.

4. The constant current control device according to claim 3, characterized in that: The multiplier 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 drive 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; The phase of the driving signal is equal to the target phase.

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

6. The constant current control device according to claim 5, characterized in that: The controller is further specifically configured to, when an absolute value of a 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, use a sum of the first control signal and a second step value as the control signal provided to the digital-to-analog converter this time; or, When 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 is used as the control signal provided to the digital-to-analog converter this time; The second preset value is greater than the first preset value, and the second step value is greater than the first step value.

7. The constant current control device according to claim 1, characterized in that: The computational constant current module comprises: a computational constant current circuit and a voltage conversion circuit; The feedback end and output end of the operational constant current circuit are electrically connected to the input end of the transformer circuit respectively; the operational constant current circuit is used to regulate the excitation signal provided to the input end of the transformer circuit according to the drive signal and the feedback signal provided by the feedback end; the transformer circuit is used to output a constant current signal to the load output end according to the excitation signal.

8. 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 operation module.

9. The constant current control device according to claim 8, characterized in that: The signal feedback module includes: a sampling circuit and an analog-to-digital conversion module; The sampling circuit and the load are connected in series at the load output end, the sampling output end of the sampling circuit is electrically connected to the input end of the analog-to-digital conversion module, and the output end of the analog-to-digital conversion module is electrically connected to the input end of the controller.

10. The constant current control device according to claim 9, 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.

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

12. The constant current control device according to claim 11, characterized in that: The power isolation module includes: an isolation circuit and at least one step-down circuit; The input end of the isolation circuit is electrically connected to the power supply, the output end of the isolation circuit is electrically connected to the input end of each step-down circuit, and each output end of each step-down circuit is electrically connected to the power supply end of the operational constant current module and the power supply end of the signal feedback module respectively.

13. The constant current control device according to claim 7, 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 input terminal of the transformer circuit, and the comparison output terminal of the comparator is electrically connected to the input terminal of the transformer circuit.

14. The constant current control device according to claim 7, characterized in that: The voltage conversion circuit includes a voltage boost circuit.

15. An ablation device, characterized in that: The constant current control device comprises the constant current control device according to any one of claims 1 to 14.

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