Oil pump driving circuit and medical equipment

Abstract

The utility model provides an oil pump drive circuit and medical equipment, the oil pump drive circuit includes: voltage stabilization drive circuit, in-phase addition circuit, resistance voltage division circuit and control signal input circuit, voltage stabilization drive circuit includes voltage stabilizer, control signal input circuit includes voltage follower and resistance capacitance circuit; the voltage stabilizer is respectively and electrically connected with the power supply and the in-phase addition circuit and is electrically connected with an external oil pump, the resistance voltage division circuit is respectively and electrically connected with the voltage stabilizer and the in-phase addition circuit, the voltage follower is respectively and electrically connected with the resistance-capacitance circuit and the in-phase addition circuit, and the resistance-capacitance circuit is further electrically connected with an external pulse width modulation signal generator. Through the implementation of the utility model, the voltage stabilizer provides the driving voltage for the oil pump, and the in-phase summing circuit adjusts the working parameters of the voltage stabilizer according to the comparison result of the output voltage and the reference voltage, so that the voltage stabilizer outputs the stable driving voltage, and the stable movement speed of equipment can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to an oil pump drive circuit and a medical device. Background Art

[0002] In an electric integrated operating bed, a DC oil pump can be used to provide hydraulic power for a hydraulic system, so that the operating bed can realize various angle adjustments and movements. Usually, the electric integrated operating bed has the function of being powered by an internal battery. When the external AC power supply is disconnected, the internal battery can supply power to the drive circuit of the oil pump. In the related art, the oil pump drive circuit usually adopts the MOS switch control drive method. The MOS switch controls the magnitude of the output voltage according to the change of the input voltage. Therefore, this control method will cause the working voltage of the oil pump to change with the change of the battery voltage, resulting in inconsistent hydraulic power provided by the oil pump during operation, and thus the movement speed of the bed body also changes with the change of the battery voltage. Summary of the Utility Model

[0003] The utility model provides an oil pump drive circuit and a medical device, aiming to solve the problem of poor stability of the working voltage of the oil pump caused by the oil pump drive control method in the related art.

[0004] To solve the above technical problems, a first aspect of the utility model provides an oil pump drive circuit, including: a voltage stabilization drive circuit, a non-inverting summing circuit, a resistor voltage division circuit, and a control signal input circuit. The voltage stabilization drive circuit includes a voltage regulator, and the control signal input circuit includes a voltage follower and a resistor-capacitor circuit. The voltage regulator is electrically connected to the power supply and the non-inverting summing circuit respectively and is used to be electrically connected to an external oil pump. The resistor voltage division circuit is electrically connected to the voltage regulator and the non-inverting summing circuit respectively. The voltage follower is electrically connected to one end of the resistor-capacitor circuit and the non-inverting summing circuit respectively. The other end of the resistor-capacitor circuit is used to be electrically connected to an external pulse width modulation signal generator.

[0005] Further, the oil pump drive circuit further includes a current sampling resistor, a first differential amplifier circuit, and a second differential amplifier circuit. The current sampling resistor is electrically connected between the voltage regulator and the resistor voltage division circuit. The first end of the first differential amplifier circuit is electrically connected to the current sampling resistor, and the second end of the first differential amplifier circuit is used to be electrically connected to an external main control unit. The first end of the second differential amplifier circuit is electrically connected to the resistor voltage division circuit, and the second end of the second differential amplifier circuit is used to be electrically connected to an external main control unit.

[0006] Further, the resistor-capacitor circuit includes a first resistor, a second resistor, a first capacitor, and a second capacitor; the second resistor is electrically connected to the voltage follower and one end of the first resistor respectively, the other end of the first resistor is used to be electrically connected to the pulse width modulation signal generator, one end of the first capacitor is electrically connected to one end of the first resistor, one end of the second capacitor is electrically connected to the common connection end of the voltage follower and the second resistor, and the other ends of the first capacitor and the second capacitor are both grounded.

[0007] Further, the non-inverting summing circuit includes a non-inverting summer, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor; the non-inverting input terminal of the non-inverting summer is electrically connected to the voltage follower through the third resistor and electrically connected to the resistor voltage dividing circuit through the fourth resistor, the inverting input terminal and the output terminal of the non-inverting summer are interconnected through the fifth resistor, and the output terminal of the non-inverting summer is electrically connected to the voltage feedback terminal of the voltage regulator through the sixth resistor, one end of the seventh resistor is electrically connected to the inverting input terminal of the non-inverting summer, and the other end of the seventh resistor is grounded.

[0008] Further, the second differential amplifier circuit includes a second differential amplifier, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, and a fifteenth resistor; the first terminal of the second differential amplifier is electrically connected to the resistor voltage dividing circuit through the twelfth resistor, the second terminal of the second differential amplifier is grounded through the thirteenth resistor, and the second terminal and the third terminal of the second differential amplifier are interconnected through the fourteenth resistor, and the third terminal of the second differential amplifier is further used to be electrically connected to the main control unit through the fifteenth resistor.

[0009] Further, the resistor voltage dividing circuit includes a first voltage dividing resistor and a second voltage dividing resistor, one end of the first voltage dividing resistor is electrically connected to the common connection end of the voltage regulator and the oil pump, the other end of the first voltage dividing resistor is electrically connected to one end of the second voltage dividing resistor, and the other end of the second voltage dividing resistor is grounded.

[0010] Further, the voltage regulator includes any one of the following: a buck voltage regulator, a boost voltage regulator, and a buck-boost voltage regulator.

[0011] In the second aspect of the present invention, a medical device is provided, including the oil pump driving circuit as described in the first aspect of the present invention.

[0012] As can be seen from the above description, the utility model uses a voltage regulator to provide a driving voltage for the oil pump, and adjusts the working parameters of the voltage regulator according to the comparison result of the output voltage and the reference voltage through a non-inverting summing circuit, so that the driving voltage output by the voltage regulator remains stable. At the same time, by adjusting the duty cycle of the pulse width modulation signal, different voltage values can be output by the voltage regulator, thereby ensuring that the oil pump obtains a stable and adjustable working voltage to ensure that the equipment can maintain a stable movement speed under power-off conditions. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of an oil pump driving circuit according to an embodiment of the utility model;

[0014] Figure 2 is a circuit schematic diagram of a non-inverting summing circuit and a control signal input circuit according to an embodiment of the utility model;

[0015] Figure 3 is a schematic structural diagram of another oil pump driving circuit according to an embodiment of the utility model;

[0016] Figure 4 is a circuit schematic diagram of a first differential amplifier circuit according to an embodiment of the utility model;

[0017] Figure 5 is a circuit schematic diagram of a second differential amplifier circuit according to an embodiment of the utility model;

[0018] Figure 6 is a circuit schematic diagram of an oil pump driving circuit according to an embodiment of the utility model.

[0019] In the drawings, each reference numeral denotes: 100, a voltage stabilizing drive circuit; 110 (U1), a voltage regulator; 200, a non-inverting summing circuit; 300, a resistive voltage dividing circuit; 400, a control signal input circuit; 410 (U3A), a voltage follower; 420, a resistor-capacitor circuit; 500, an oil pump; 600, a pulse width modulation signal generator; 700 (R5), a current sampling resistor; 800, a first differential amplifier circuit; 900, a second differential amplifier circuit; 1000, a main control unit; R33, a first resistor; R34, a second resistor; R35, a third resistor; R32, a fourth resistor; R38, a fifth resistor; R36, a sixth resistor; R37, a seventh resistor; R22, an eighth resistor; R26, a ninth resistor; R31, a tenth resistor; R25, an eleventh resistor; R23, a twelfth resistor; R24, a thirteenth resistor; R30, a fourteenth resistor; R27, a fifteenth resistor; R8, a sixteenth resistor; R9, a seventeenth resistor; R13, an eighteenth resistor; R10, a first voltage dividing resistor; R21, a second voltage dividing resistor; C26, a first capacitor; C24, a second capacitor; C15, a third capacitor; U3B, a non-inverting summer; U2A, a first differential amplifier; U2B, a second differential amplifier. Detailed implementation manners

[0020] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. In addition, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] In the related art, since there is a problem that the working voltage stability of an oil pump drive circuit with a MOS switch control method is poor, for this reason, the embodiments of the present utility model provide an oil pump drive circuit.

[0022] As Figure 1The following is a schematic structural diagram of an oil pump drive circuit provided by this embodiment. The oil pump drive circuit includes: a voltage stabilization drive circuit 100, a non-inverting summing circuit 200, a resistor voltage division circuit 300, and a control signal input circuit 400. The voltage stabilization drive circuit 100 includes a voltage regulator 110. The control signal input circuit 400 includes a voltage follower 410 and a resistor-capacitor circuit 420. The voltage regulator 110 is electrically connected to the power supply and the non-inverting summing circuit 200 respectively and is used to be electrically connected to an external oil pump 500. The resistor voltage division circuit 300 is electrically connected to the voltage regulator 110 and the non-inverting summing circuit 200 respectively. The voltage follower 410 is electrically connected to one end of the resistor-capacitor circuit 420 and the non-inverting summing circuit 200 respectively. The other end of the resistor-capacitor circuit 420 is used to be electrically connected to an external pulse width modulation signal generator 600.

[0023] Specifically, in this embodiment, the oil pump drive circuit provides a power supply voltage for the oil pump 500 through a DC-DC voltage regulator 110. The voltage regulator 110 can be any one of the following: a buck regulator, a boost regulator, and a buck-boost regulator. The DC-DC voltage regulator 110 can be used to convert the DC voltage provided by the input power supply into an adjustable DC low voltage or DC high voltage. The non-inverting summing circuit 200 adjusts the working parameters of the voltage regulator 110 according to the comparison result between the reference voltage and the output voltage, so that the output voltage of the voltage regulator 110 remains stable, thereby providing a stable drive voltage for the oil pump 500. In addition, by adjusting the pulse width modulation (PWM) signal, different output voltages can be obtained to provide an adjustable working voltage for the oil pump 500. Among them, the resistor-capacitor (RC) circuit 420 is used to convert the PWM signal into an analog voltage signal, and the voltage follower 410 isolates the influence of the control signal (i.e., the PWM signal) on the non-inverting summing circuit 200 to improve the stability of the circuit. Thus, this embodiment can effectively solve the problem that the working voltage of the oil pump is affected by the input voltage, ensure the stability of the movement speed of equipment such as an operating table body, and improve the reliability of equipment control.

[0024] Further, please refer to Figure 2 the circuit schematic diagram of a non-inverting summing circuit and a control signal input circuit as shown. The resistor-capacitor circuit 420 includes a first resistor R33, a second resistor R34, a first capacitor C26, and a second capacitor C24. The second resistor R34 is electrically connected to the voltage follower U3A (i.e., 410) and one end of the first resistor R33 respectively. The other end of the first resistor R33 is used to be electrically connected to the pulse width modulation signal generator 600. One end of the first capacitor C26 is electrically connected to one end of the first resistor R33. One end of the second capacitor C24 is electrically connected to the common connection end of the voltage follower U3A and the second resistor R34. The other ends of the first capacitor C26 and the second capacitor C24 are both grounded.

[0025] Further, please refer to Figure 2 , the non-inverting summing circuit 200 includes a non-inverting summing amplifier U3B, a third resistor R35, a fourth resistor R32, a fifth resistor R38, a sixth resistor R36, and a seventh resistor R37; the non-inverting input terminal of the non-inverting summing amplifier U3B is electrically connected to the voltage follower U3A through the third resistor R35 and is electrically connected to the resistor voltage dividing circuit 300 through the fourth resistor R32. The inverting input terminal and the output terminal of the non-inverting summing amplifier U3B are interconnected through the fifth resistor R38, and the output terminal of the non-inverting summing amplifier U3B is electrically connected to the voltage feedback terminal of the voltage regulator 110 through the sixth resistor R36. One end of the seventh resistor R37 is electrically connected to the inverting input terminal of the non-inverting summing amplifier U3B, and the other end of the seventh resistor R37 is grounded.

[0026] Specifically, in this embodiment, the RC circuit 420 has a low-pass filtering function and can convert the PWM signal into an analog voltage signal. When the output voltage of the voltage regulator 110 deviates from the set value, the non-inverting summing amplifier U3B can adjust the output feedback voltage of the voltage regulator 110 to adjust the output voltage and restore it to the set value. The third resistor R35, the fourth resistor R32, the fifth resistor R38, the sixth resistor R36, and the seventh resistor R37 connected to each terminal of the non-inverting summing amplifier U3B can be used for current limiting to protect the device.

[0027] As Figure 3 shown is a schematic structural diagram of another oil pump drive circuit provided in this embodiment. Please refer to Figure 3 , the oil pump drive circuit further includes: a current sampling resistor 700, a first differential amplifier circuit 800, and a second differential amplifier circuit 900; the current sampling resistor 700 is electrically connected between the voltage regulator 110 and the resistor voltage dividing circuit 300. The first end of the first differential amplifier circuit 800 is electrically connected to the current sampling resistor 700, the second end of the first differential amplifier circuit 800 is used for electrically connecting to an external main control unit 1000, the first end of the second differential amplifier circuit 900 is electrically connected to the resistor voltage dividing circuit 300, and the second end of the second differential amplifier circuit 900 is used for electrically connecting to an external main control unit 1000.

[0028] Specifically, this embodiment is also provided with two differential amplifier circuits, which are respectively used to amplify the output current signal and the output voltage signal and then transmit them to the external main control unit 1000 for current monitoring and voltage monitoring. Among them, the output current signal can be obtained through the current sampling resistor 700, and the output voltage signal can be obtained through the resistor voltage dividing circuit 300. In addition, the main control unit 1000 in this embodiment can be an MCU. The MCU can control the voltage regulator 110 according to the output current signal and the output voltage signal. For example, when the output voltage or the output current is abnormal, the MCU controls the voltage regulator 110 to stop working, thereby ensuring the stability of the circuit.

[0029] AsFigure 4 , Figure 5 The circuit schematic diagrams of a first differential amplifier circuit and a second differential amplifier circuit provided in this embodiment are shown respectively. Please refer to Figures 3 to 5 . The first differential amplifier circuit 800 includes a first differential amplifier U2A, an eighth resistor R22, a ninth resistor R26, a tenth resistor R31, and an eleventh resistor R25. One end of the current sampling resistor R5 is electrically connected to the first terminal of the first differential amplifier U2A through the eighth resistor R22, and the other end of the current sampling resistor R5 is electrically connected to the second terminal of the first differential amplifier U2A through the ninth resistor R26. Moreover, the second terminal and the third terminal of the first differential amplifier U2A are interconnected through the tenth resistor R31, and the third terminal of the first differential amplifier U2A is further used to be electrically connected to the main control unit 1000 through the eleventh resistor R25.

[0030] The second differential amplifier circuit 900 includes a second differential amplifier U2B, a twelfth resistor R23, a thirteenth resistor R24, a fourteenth resistor R30, and a fifteenth resistor R27. The first terminal of the second differential amplifier U2B is electrically connected to the resistor voltage division circuit 300 through the twelfth resistor R23, the second terminal of the second differential amplifier U2B is grounded through the thirteenth resistor R24, and the second terminal and the third terminal of the second differential amplifier U2B are interconnected through the fourteenth resistor R30. The third terminal of the second differential amplifier U2B is further used to be electrically connected to the main control unit 1000 through the fifteenth resistor R27.

[0031] In addition, both the first differential amplifier circuit 800 and the second differential amplifier circuit 900 further include resistors R28 / R29, capacitors C22 / C23, capacitors C18 / C20, and capacitors C19 / C21. One end of the resistors R28 / R29 and the capacitors C18 / C20 is electrically connected to the first terminal of the differential amplifier U2A / U2B, the other end of the resistors R28 / R29 and the capacitors C18 / C20 is grounded, one end of the capacitors C19 / C21 is electrically connected to the third terminal of the differential amplifier U2A / U2B, the other end of the capacitors C19 / C21 is grounded, and the capacitors C22 / C23 are connected in parallel across both ends of the resistors R31 / R30.

[0032] Specifically, in this embodiment, the structures of the two differential amplifier circuits for transmitting the output current and the output voltage are similar. They are both composed of a differential amplifier, resistors, and capacitors. By combining resistors and capacitors, the differential amplifier can stably amplify the received output current signal and output voltage signal and then transmit them to the MCU.

[0033] As Figure 6 shown is the circuit schematic diagram of an oil pump drive circuit provided in this embodiment. Please refer to Figure 6, the resistor voltage division circuit 300 includes a first voltage division resistor R10 and a second voltage division resistor R21. One end of the first voltage division resistor R10 is electrically connected to the common connection end of the voltage regulator U1 (i.e., 110) and the oil pump 500. The other end of the first voltage division resistor R10 is electrically connected to one end of the second voltage division resistor R21, and the other end of the second voltage division resistor R21 is grounded.

[0034] Further, please refer to Figure 6 , the oil pump drive circuit further includes a sixteenth resistor R8, a seventeenth resistor R9, an eighteenth resistor R13, and a third capacitor C15; one end of the sixteenth resistor R8 is electrically connected to one end of the current sampling resistor R5 (i.e., 700), the other end of the sixteenth resistor R8 is electrically connected to the first current sensing end of the voltage regulator U1, one end of the seventeenth resistor R9 is electrically connected to the other end of the current sampling resistor R5, one end of the seventeenth resistor R9 is electrically connected to the second current sensing end of the voltage regulator U1, and the eighteenth resistor R13 and the third capacitor C15 are respectively electrically connected to the other ends of the sixteenth resistor R8 and the seventeenth resistor R9.

[0035] Specifically, in this embodiment, the resistor voltage division circuit 300 uses two voltage division resistors to collect the voltage signal output to the oil pump. One end of the first voltage division resistor R10 is connected to the output end of the voltage regulator U1 to obtain the output voltage Vout_PMUP. Figure 6 The connector J1 in [[ ]] is the power input interface of the oil pump, V_SPS_BAT is the voltage provided by the internal battery of the device, and the model of the voltage regulator U1 can be MP9928. The current sampling resistor R5 transmits the current sampling signal to the first differential amplifier U2A and the voltage regulator U1 through a resistor-capacitor combination, which can make the current sampling signal obtained by the first differential amplifier U2A and the voltage regulator U1 have better accuracy and stability, thereby improving the processing accuracy of the subsequent circuit.

[0036] The oil pump drive circuit provided by the embodiment of the present invention uses a voltage regulator to provide a drive voltage for the oil pump, and adjusts the working parameters of the voltage regulator according to the comparison result of the output voltage and the reference voltage through a non-inverting summing circuit, so that the drive voltage output by the voltage regulator remains stable. At the same time, by adjusting the duty cycle of the pulse width modulation signal, different voltage values can be output by the voltage regulator, thereby ensuring that the oil pump obtains a stable and adjustable working voltage to ensure that the device can maintain a stable movement speed in the case of power-off.

[0037] The embodiment of the present invention also provides a medical device, which includes the above-mentioned oil pump drive circuit. Among them, the medical device can be an electric operating table.

[0038] It should be noted that the various embodiments in the content of the present utility model are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0039] It should also be noted that in the content of the present utility model, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0040] The above description of the disclosed embodiments enables those skilled in the art to implement or use the content of the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined in the content of the present utility model can be implemented in other embodiments without departing from the spirit or scope of the content of the present utility model. Therefore, the content of the present utility model will not be limited to these embodiments shown in the content of the present utility model, but rather to the widest scope consistent with the principles and novel features disclosed in the content of the present utility model.

Claims

1. An oil pump drive circuit, characterized in that, Comprising: A voltage stabilizing drive circuit, a non-inverting summing circuit, a resistive voltage dividing circuit, and a control signal input circuit. The voltage stabilizing drive circuit includes a voltage regulator, and the control signal input circuit includes a voltage follower and a resistive-capacitive circuit; The voltage regulator is electrically connected to the power supply and the non-inverting summing circuit respectively and is used to be electrically connected to an external oil pump. The resistive voltage dividing circuit is electrically connected to the voltage regulator and the non-inverting summing circuit respectively. The voltage follower is electrically connected to one end of the resistive-capacitive circuit and the non-inverting summing circuit respectively. The other end of the resistive-capacitive circuit is used to be electrically connected to an external pulse width modulation signal generator.

2. The oil pump drive circuit according to claim 1, wherein It further includes a current sampling resistor, a first differential amplifier circuit, and a second differential amplifier circuit; The current sampling resistor is electrically connected between the voltage regulator and the resistive voltage dividing circuit. The first end of the first differential amplifier circuit is electrically connected to the current sampling resistor, and the second end of the first differential amplifier circuit is used to be electrically connected to an external main control unit. The first end of the second differential amplifier circuit is electrically connected to the resistive voltage dividing circuit, and the second end of the second differential amplifier circuit is used to be electrically connected to an external main control unit.

3. The oil pump drive circuit according to claim 1, characterized in that The resistive-capacitive circuit includes a first resistor, a second resistor, a first capacitor, and a second capacitor; The second resistor is electrically connected to the voltage follower and one end of the first resistor respectively. The other end of the first resistor is used to be electrically connected to the pulse width modulation signal generator. One end of the first capacitor is electrically connected to one end of the first resistor. One end of the second capacitor is electrically connected to the common connection end of the voltage follower and the second resistor. The other ends of the first capacitor and the second capacitor are both grounded.

4. The oil pump drive circuit according to claim 1, wherein The non-inverting summing circuit includes a non-inverting summer, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor; The non-inverting input terminal of the non-inverting summer is electrically connected to the voltage follower through the third resistor and is electrically connected to the resistive voltage dividing circuit through the fourth resistor. The inverting input terminal and the output terminal of the non-inverting summer are interconnected through the fifth resistor. And the output terminal of the non-inverting summer is electrically connected to the voltage feedback terminal of the voltage regulator through the sixth resistor. One end of the seventh resistor is electrically connected to the inverting input terminal of the non-inverting summer, and the other end of the seventh resistor is grounded.

5. The oil pump drive circuit according to claim 2, wherein The first differential amplifier circuit includes a first differential amplifier, an eighth resistor, a ninth resistor, a tenth resistor, and an eleventh resistor; The first end of the first differential amplifier is electrically connected to one end of the current sampling resistor through the eighth resistor. The second end of the first differential amplifier is electrically connected to the other end of the current sampling resistor through the ninth resistor. And the second end and the third end of the first differential amplifier are interconnected through the tenth resistor. The third end of the first differential amplifier is also used to be electrically connected to the main control unit through the eleventh resistor.

6. The oil pump drive circuit according to claim 2, characterized in that, The second differential amplifier circuit includes a second differential amplifier, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, and a fifteenth resistor; The first end of the second differential amplifier is electrically connected to the resistor voltage dividing circuit through the twelfth resistor, the second end of the second differential amplifier is grounded through the thirteenth resistor, and the second end and the third end of the second differential amplifier are interconnected through the fourteenth resistor. The third end of the second differential amplifier is further configured to be electrically connected to the main control unit through the fifteenth resistor.

7. The oil pump drive circuit according to claim 1, characterized in that, The resistor voltage dividing circuit includes a first voltage dividing resistor and a second voltage dividing resistor. One end of the first voltage dividing resistor is electrically connected to the common connection end of the voltage regulator and the oil pump, the other end of the first voltage dividing resistor is electrically connected to one end of the second voltage dividing resistor, and the other end of the second voltage dividing resistor is grounded.

8. The oil pump drive circuit according to claim 2, characterized in that, It further includes a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, and a third capacitor; One end of the sixteenth resistor is electrically connected to one end of the current sampling resistor, the other end of the sixteenth resistor is electrically connected to the first current sensing end of the voltage regulator, one end of the seventeenth resistor is electrically connected to the other end of the current sampling resistor, one end of the seventeenth resistor is electrically connected to the second current sensing end of the voltage regulator, and both the eighteenth resistor and the third capacitor are respectively electrically connected to the other ends of the sixteenth resistor and the seventeenth resistor.

9. The oil pump drive circuit according to any one of claims 1 to 8, characterized in that, The voltage regulator includes any one of the following: a buck voltage regulator, a boost voltage regulator, and a buck-boost voltage regulator.

10. A medical device, characterized in that, It includes an oil pump drive circuit according to any one of claims 1 to 9.

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