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CN-224203627-U - Current-voltage conversion circuit structure for electroporation delivery

CN224203627UCN 224203627 UCN224203627 UCN 224203627UCN-224203627-U

Abstract

The utility model discloses a current-voltage conversion circuit structure for electroporation delivery, which comprises a current-voltage conversion circuit and a voltage-pulse conversion circuit. The current-to-voltage circuit converts a current signal into voltage through an input signal processing module, high-precision amplification is realized through an operational amplifier and a feedback network of a signal amplifying module, driving capability is enhanced through a transistor cascade circuit, and temperature drift is dynamically compensated by combining a thermistor. The voltage-to-pulse circuit corrects nonlinear errors through a resistor network of the linearization processing module, gain adjustment is achieved through an operational amplifier and an adjustable resistor, and finally load change is adapted through a field effect transistor and a negative feedback network. The circuit realizes high conversion precision, wide temperature area stability and load self-adaption capability, and is suitable for high-precision scenes such as medical treatment or beauty electroporation, industrial sensing and the like.

Inventors

  • Yang Bingcong

Assignees

  • 广州姿洁科学技术有限公司

Dates

Publication Date
20260505
Application Date
20250527

Claims (10)

  1. 1. A current-to-voltage conversion circuit structure for electroporation delivery, characterized by comprising a current-to-voltage conversion circuit (1) connected to an external signal source, the current-to-voltage conversion circuit (1) comprising: An input signal processing module (11) with an input end connected with an external signal source and used for converting an input current signal into a voltage signal; The signal amplification processing module (12) is connected with the output end of the input signal processing module (11) and is used for amplifying the converted voltage signal; The output driving module (13) is connected with the output end of the signal amplification processing module (12) and is used for enhancing the current driving capability of the circuit and outputting a stable voltage signal; The temperature compensation module (14) is connected to the power supply loop of the signal amplification processing module (12) and is used for dynamically adjusting the equivalent impedance of the power supply loop to compensate the influence of temperature change on circuit accuracy, wherein the signal amplification processing module (12) comprises a first operational amplifier (121).
  2. 2. The current-to-voltage conversion circuit arrangement according to claim 1, characterized in that the input signal processing module (11) comprises a current signal input (111) connected to an external signal source and a sampling unit (112) for converting an input current into a voltage, the sampling unit (112) comprising a first resistor (R20), the current signal input (111) being connected to the non-inverting input of the first operational amplifier (121) via the first resistor (R20).
  3. 3. The current-voltage conversion circuit structure according to claim 1, wherein the signal amplification processing module (12) comprises the first operational amplifier (121) and a feedback network for optimizing frequency characteristics, the feedback network comprises a second resistor (R14), a fourth resistor (R5) and a first capacitor (C4), one end of the second resistor (R14) is grounded through the fourth resistor (R5), the other end of the second resistor is connected to an inverting input end of the first operational amplifier (121), and the first capacitor (C4) is connected between the inverting input end and an output end of the first operational amplifier (121).
  4. 4. A current to voltage conversion circuit arrangement according to claim 3, characterized in that the first operational amplifier (121) is an operational amplifier of model LMV321 IDBVR and the second resistor (R14) is a metal film resistor of 0.1% precision.
  5. 5. The current-voltage conversion circuit structure according to claim 1, wherein the output driving module (13) comprises a transistor circuit (131) for enhancing current driving capability and cascading, a voltage clamping circuit (132) for stabilizing output voltage and a first interface (P1), the transistor circuit (131) comprises a fifth resistor (R13), a first transistor (Q5) and a second transistor (Q3), the output end of the first operational amplifier (121) is connected with the base electrode of the first transistor (Q5) through the fifth resistor (R13), the collector electrode of the first transistor (Q5) is connected with the emitter electrode of the second transistor (Q3), the voltage clamping circuit (132) comprises a first diode (D1), a second diode (D2) and a third resistor (R10), the base electrode of the second transistor (Q3) is respectively connected with the positive electrode of the direct current voltage input end (3) and the second diode (D2) through the third resistor (R10), and the second diode (D2) is respectively connected with the negative electrode of the first diode (D1) to the positive electrode of the first diode (D1).
  6. 6. The current-to-voltage conversion circuit arrangement according to claim 1, wherein the temperature compensation module (14) comprises a temperature sensitive element for adjusting a power supply loop parameter according to a temperature change, the temperature sensitive element being a thermistor (R19) connected between a power supply terminal of the first operational amplifier (121) and ground.
  7. 7. The current-voltage conversion circuit structure according to claim 1, further comprising a voltage-to-pulse conversion circuit (2) connected with an external signal source, wherein the voltage-to-pulse conversion circuit (2) comprises a linearization processing module (21), a gain adjustment module (22) for adjusting the amplitude of an output voltage and a load adaptation module (23) for automatically adjusting the output impedance according to load changes, an input end of the linearization processing module (21) is used for receiving the input voltage, an output end of the linearization processing module is connected with an input end of the gain adjustment module (22), an output end of the gain adjustment module (22) is connected with an input end of the load adaptation module (23), and an output end of the load adaptation module (23) is used for outputting pulse signals, and the linearization processing module (21) adopts a nonlinear correction circuit for correcting nonlinear relations between input currents and output voltages.
  8. 8. The current-voltage conversion circuit structure according to claim 7, wherein the nonlinear correction circuit of the linearization processing module (21) comprises a sixth resistor (R21), a seventh resistor (R24), an eighth resistor (R23) and a ninth resistor (R18), wherein the external signal source is respectively connected with one end of the sixth resistor (R21), one end of the ninth resistor (R18) and one end of the seventh resistor (R24) through the eighth resistor (R23), the other end of the sixth resistor (R21) is connected with a direct-current voltage input end (VC 3), the other end of the ninth resistor (R18) is grounded, one end of the seventh resistor (R24) is connected with an input end of the gain adjusting module (22), and the other end of the seventh resistor (R24) is connected with the direct-current voltage input end (VC 3).
  9. 9. The current-to-voltage conversion circuit structure according to claim 8, wherein the gain adjustment module (22) comprises a second operational amplifier (U1) and peripheral circuits thereof, the operational amplifier (U1) adopts an amplifier chip with a model of LTC6090 IS8E, and an adjustable resistor or a digital potentiometer IS connected between an inverting input end and an output end of the operational amplifier (U1).
  10. 10. The current-voltage conversion circuit structure according to claim 7, wherein the load adaptation module (23) comprises a third transistor (Q1), a field effect transistor (Q4), a fourteenth resistor (R2), a fifteenth resistor (R1), a sixteenth resistor (R8), a seventeenth resistor (R9), a nineteenth resistor (R4) and a second interface (P2), wherein an output end of the gain adjustment module (22) is respectively connected with a source of the field effect transistor (Q4) and one end of the sixteenth resistor (R8), a gate of the field effect transistor (Q4) is respectively connected with the other end of the sixteenth resistor (R8) and one end of the nineteenth resistor (R4), a drain of the field effect transistor (Q4) is connected with the second interface (P2) and is grounded through the seventeenth resistor (R9), the other end of the nineteenth resistor (R4) is connected with the third transistor (Q1), an external signal source is connected with one end of the fifteenth resistor (R1) and one end of the fifteenth resistor (Q1) through the fourteenth resistor (R2), the other end of the fifteenth resistor (R1) is connected with the collector of the third transistor (Q1) and the third transistor is grounded.

Description

Current-voltage conversion circuit structure for electroporation delivery Technical Field The utility model relates to the field of medical electronic circuits, in particular to a current-voltage conversion circuit structure for electroporation delivery. Background In modern electronic systems, current signals and the conversion of current signals are common demands in signal processing. For example, in sensor signal processing, analog signal transmission, and data acquisition systems, it is often necessary to convert a current signal to a current signal for further processing or measurement. The traditional current-voltage conversion circuit generally adopts a simple resistance conversion mode, but the mode has the problems of low precision, large temperature drift, poor linearity and the like, and is difficult to meet the requirements of high-precision measurement and complex signal processing. In addition, conventional circuits often require redesign of circuit parameters in the face of different input current ranges, lacking flexibility and versatility. Therefore, how to overcome the above-mentioned drawbacks has become an important issue to be solved by the person skilled in the art. Disclosure of utility model The utility model overcomes the defects of the technology, provides a current-voltage conversion circuit structure for electroporation delivery, and solves the problems of low precision, large temperature drift and poor linearity caused by simple resistance conversion adopted by the traditional circuit. In order to achieve the above purpose, the present utility model adopts the following technical scheme: A current-to-voltage conversion circuit structure for electroporation delivery, comprising a current-to-voltage conversion circuit 1 connected to an external signal source, the current-to-voltage conversion circuit 1 comprising: An input signal processing module 11, the input end of which is connected with an external signal source and is used for converting an input current signal into a voltage signal; The signal amplification processing module 12 is connected with the output end of the input signal processing module 11 and is used for amplifying the converted voltage signal; the output driving module 13 is connected with the output end of the signal amplification processing module 12 and is used for enhancing the current driving capability of the circuit and outputting a stable voltage signal; The temperature compensation module 14 is connected to the power supply loop of the signal amplification processing module 12, and is used for dynamically adjusting the equivalent impedance of the power supply loop to compensate the influence of temperature variation on the circuit precision, wherein the signal amplification processing module 12 comprises a first operational amplifier 121. Preferably, the input signal processing module 11 includes a current signal input terminal 111 connected to an external signal source and a sampling unit 112 for converting an input current into a voltage, and the sampling unit 112 includes a first resistor R20, and the current signal input terminal 111 is connected to a non-inverting input terminal of the first operational amplifier 121 through the first resistor R20. Preferably, the signal amplification processing module 12 includes the first operational amplifier 121 and a feedback network for optimizing frequency characteristics, the feedback network includes a second resistor R14, a fourth resistor R5, and a first capacitor C4, one end of the second resistor R14 is grounded through the fourth resistor R5, the other end is connected to the inverting input end of the first operational amplifier 121, and the first capacitor C4 is connected between the inverting input end and the output end of the first operational amplifier 121. Preferably, the first operational amplifier 121 is an operational amplifier with a model number of LMV321 IDBVR, and the second resistor R14 is a metal film resistor with 0.1% precision. Preferably, the output driving module 13 comprises a transistor circuit 131 for enhancing current driving capability and cascading, a voltage clamping circuit (132) for stabilizing output voltage and a first interface P1, wherein the transistor circuit 131 comprises a fifth resistor R13, a first transistor Q5 and a second transistor Q3, an output end of the first operational amplifier 121 is connected with a base electrode of the first transistor Q5 through the fifth resistor R13, a collector electrode of the first transistor Q5 is connected with an emitter electrode of the second transistor Q3, the voltage clamping circuit (132) comprises a first diode D1, a second diode D2 and a third resistor (R10), a base electrode of the second transistor Q3 is respectively connected with a direct-current voltage input end VC3 and a positive electrode of the second diode D2 through the third resistor R10, a negative electrode of the second diode D2 is respectively conn