Voltage conversion device with adjustable gear, neural stimulator and electronic device

Abstract

The present specification provides a voltage conversion device, a neural stimulator and an electronic device with adjustable gears, wherein the device comprises: a voltage feedback module and a voltage conversion module, wherein the voltage feedback module comprises a gear selection switch and a feedback voltage control circuit, wherein the input end of the feedback voltage control circuit is connected to the input end of the feedback circuit, and the output end is connected to the feedback voltage input end of the voltage feedback module; wherein: when the gear selection switch is in a target gear, the feedback voltage control circuit adjusts the feedback voltage input to the input end of the feedback circuit to a target feedback voltage matching the target gear and outputs it to the feedback voltage input end; and when the target feedback voltage is not equal to a preset reference voltage, the voltage conversion module adjusts the load voltage output from the voltage output end of the voltage conversion module to a target load voltage matching the target gear.

Description

Technical Field

[0001] The present invention relates to the field of control engineering technology, and in particular to a voltage conversion device with adjustable gears, a neural stimulator and an electronic device. Background Art

[0002] DC-DC converters are used to adjust the voltage of batteries, power adapters, or other power sources to the voltage level required by load devices, thereby meeting the specific voltage requirements of different load devices. For example, implantable neurostimulators need to work in the body for a long time and rely on built-in batteries for power. Some circuits may require higher voltages to generate effective neurostimulation signals, while control circuits or sensor circuits may require lower voltages. DC-DC converters can convert a single battery voltage into multiple required voltage levels.

[0003] The gear design of the DC-DC converter in the related art adopts the linear grading principle, that is, the load voltage range is linearly divided into multiple gears according to the same voltage step, and the load voltage change difference between adjacent gears is the same. When the voltage step remains unchanged, the voltage range is proportional to the number of voltage gears. However, in some usage scenarios, the rate of change between different load voltages required by some load devices is large, but the number of load voltages that need to be provided is limited, which causes the DC-DC converter to only need to use a few of the gears during actual use, and the remaining gears between these gears are wasted because they are not used. Summary of the invention

[0004] In order to overcome the problems existing in the related art, this specification provides a voltage conversion device with adjustable gears, a neural stimulator and an electronic device.

[0005] According to a first aspect of an embodiment of this specification, there is provided a voltage conversion device with adjustable gear, the device comprising:

[0006] A voltage feedback module and a voltage conversion module, wherein the voltage feedback module includes a gear selection switch and a feedback voltage control circuit, wherein the input end of the feedback voltage control circuit is connected to the input end of the feedback circuit, and the output end is connected to the feedback voltage input end of the voltage feedback module; wherein:

[0007] When the gear selection switch is in the target gear, the feedback voltage control circuit adjusts the feedback voltage inputted from the feedback circuit input terminal to a target feedback voltage matching the target gear and outputs it to the feedback voltage input terminal;

[0008] When the target feedback voltage is not equal to a preset reference voltage, the voltage conversion module adjusts the load voltage outputted from the voltage output terminal of the voltage conversion module to a target load voltage matching the target gear; wherein the load voltage values ​​of each gear are nonlinearly distributed.

[0009] According to a second aspect of an embodiment of this specification, a neural stimulator is provided, wherein the neural stimulator employs the device as described in the first aspect.

[0010] According to a third aspect of the embodiments of this specification, an electronic device is provided, wherein the electronic device is applied with the apparatus as described in the first aspect.

[0011] The technical solutions provided by the embodiments of this specification may have the following beneficial effects:

[0012] In the embodiments of this specification, corresponding gears can be set for all nonlinearly distributed load voltage values ​​that the load device needs to use, and when the gear selection switch is in the target gear, the voltage conversion device is adjusted to output the target load voltage. Since this solution sets the gears according to the load voltage requirements, rather than using a linear grading method to grade the load voltage range, it can ensure that there are no redundant gears in the device, thereby reducing the design complexity of the gear circuit.

[0013] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.

[0015] Figure 1 1 is a schematic structural diagram of a DC-DC converter of related technology shown in this specification according to an exemplary embodiment.

[0016] Figure 2 It is a structural schematic diagram of a voltage conversion device with adjustable gears according to an exemplary embodiment of this specification.

[0017] Figure 3 It is a structural schematic diagram of another voltage conversion device with adjustable gears according to an exemplary embodiment of this specification.

[0018] Figure 4 It is a structural schematic diagram of another voltage conversion device with adjustable gears according to an exemplary embodiment of this specification.

[0019] Figure 5It is a schematic diagram of the structure of resistors at various gears shown in this specification according to an exemplary embodiment.

[0020] Figure 6 It is a structural schematic diagram of another voltage conversion device with adjustable gears according to an exemplary embodiment of this specification. DETAILED DESCRIPTION

[0021] A DC-DC converter (i.e., direct current-to-direct current converter) is used to adjust the voltage of a battery, power adapter, or other power source to the voltage level required by the load device, thereby meeting the specific voltage requirements of different load devices. For example, an implantable neurostimulator needs to work in the body for a long time and relies on a built-in battery for power. Some circuits may require a higher voltage to generate effective neurostimulation signals, while control circuits or sensor circuits may require a lower voltage. A DC-DC converter can convert a single battery voltage into multiple required voltage levels.

[0022] Figure 1 Schematic diagram of the structure of the DC-DC converter proposed in the related art. Figure 1 As shown, the DC-DC converter includes a voltage conversion module 12, one or more gear switches 16, and gear resistors 15 and fixed resistors R0 having the same resistance value as the gear switches. The power supply inputs the voltage to the voltage input terminal 11 of the voltage conversion module 12, and the voltage conversion module 12 converts the input voltage into the load voltage required by the load device 17, and outputs it to the load device 17 from the voltage output terminal 13. The combination of multiple gear resistors R, fixed resistor R0 and different gear switches can form a feedback loop. By adjusting the conduction state of each switch, the total resistance of the feedback loop can be changed, thereby changing the target feedback voltage input to the feedback voltage input terminal 14 of the feedback loop. The voltage conversion module 12 adjusts the load voltage value outputted from the voltage output terminal 13 based on the target feedback voltage to match the target load voltage required by the load device 17.

[0023] Figure 1 The gears of the DC-DC converter shown are linear gears, and in terms of circuit structure, the gear resistance values ​​corresponding to the gear switches at each level are the same, that is, Figure 1The resistance values ​​of the various gear resistors R in the same size. The resistance values ​​of the gear resistors R at each level are equal, and each time the gears of adjacent levels are switched, the change in the load voltage is equal, that is, the output voltage shows a linear increase or decrease trend with the change in the gear. For example, the load voltage output at the first gear is 1V, the load voltage output at the second gear is 2V, and the load voltage output at the third gear is 3V. The load voltage change between the first gear and the second gear, and the load voltage change between the third gear and the second gear are both 1V. When the voltage change required by the load device 17 is linear, that is, the voltage change is the same each time, the DC-DC converter of the linear gear can meet the application requirements. However, if the application scenario requires nonlinear voltage regulation, such as the output load voltage needs to change in an exponential, logarithmic or other nonlinear manner, the design concept of the linear gear is not suitable. In addition, the design concept of the linear gear may not be suitable for scenarios that require a wide range of voltage regulation. If the voltage range is large, then in order to achieve full range coverage, the linear gear requires a large number of gear resistors and gear switches to support the voltage changes in the voltage range, which will lead to a significant increase in circuit complexity and cost. For example, for a load voltage range of [1V, 100V], if the desired step is 0.1V, and each gear corresponds to 1V, 1.1V, 1.2V, ..., 100V, then more than 990 gears are required, and more than 990 gear switches and gear resistors are required in the circuit structure to achieve this.

[0024] In view of the above problems, this specification proposes a voltage conversion device with adjustable gears, so that when switching different gears, the change in the voltage output by the voltage conversion device is nonlinear, so as to adapt to the application scenario of nonlinear voltage regulation. See the following embodiments for details:

[0025] like Figure 2 As shown, Figure 2 This specification shows a voltage conversion device 2 with adjustable gear according to an exemplary embodiment. The device may include a voltage feedback module 21 and a voltage conversion module 12, the voltage feedback module 21 includes a feedback voltage control circuit 211 and a gear selection switch 212, the input end of the feedback voltage control circuit 211 is connected to the feedback circuit input end 22, and the output end is connected to the feedback voltage input end 14 of the voltage feedback module 21.

[0026] The gear selection switch 212 can be selectively adjusted to different levels of gears, and each level of gear is used to instruct the voltage conversion module 12 to convert the input voltage into the target load voltage required by the load device 17. For example, the input voltage is 10V, the first-level load voltage indicated by the first-level gear is 5V, and the second-level load voltage indicated by the second-level gear is 6V. When the gear selection switch 212 is in the first gear, the voltage conversion module 12 converts the 10V input voltage into a 5V load voltage for the load device 17; when the gear selection switch 212 is in the second gear, the voltage conversion module 12 converts the 10V input voltage into a 6V load voltage for the load device 17. Specifically, when the gear selection switch 212 is in the target gear, the feedback voltage control circuit 211 adjusts the feedback voltage inputted from the feedback circuit input terminal 22 to a target feedback voltage matching the target gear and outputs it to the feedback voltage input terminal 14. When the target feedback voltage is not equal to the preset reference voltage, the voltage conversion module 12 adjusts the load voltage outputted by the voltage output terminal 13 of the voltage conversion module 12 to a target load voltage matching the target gear. The load voltage values ​​of each gear are nonlinearly distributed.

[0027] In this solution, the number of adjustable gears of the gear selection switch 212 and the magnitude of the load voltage value indicated by each level gear can be determined according to the power supply characteristics of the load device 17 to which the voltage conversion device with adjustable gears will be installed. For example, taking the load device 17 as a neurostimulator, if the neurostimulator can select stimulation voltages of 3V, 5V and 8V, which is a nonlinear distribution, the number of adjustable gears of the gear selection switch 212 can be set to 3, the load voltage magnitude indicated by the first level gear is 3V, the load voltage magnitude indicated by the second level gear is 5V, and the load voltage magnitude indicated by the third level gear is 8V. When the neurostimulator needs to output a voltage of 3V, the gear selection switch 212 can be adjusted to the first level gear, and when the neurostimulator needs to output a voltage of 5V, the gear selection switch 212 can be adjusted to the second level gear.

[0028] It can be seen that this scheme is aimed at the nonlinear distribution characteristics of the load voltage of the load device 17, and the corresponding gear can be set according to the voltage required for the power supply of the load device 17, which can meet the nonlinear changes between the gears at each level. The design idea of ​​linear grading is that the load voltage change indicated by each gear is linear. For example, the change of each linear gear may be 3V, 4V, 5V, ..., 8V, and a total of 6 gears are required to realize the conversion between the load voltages in the above example, while the three gears of 4V, 6V, and 7V are not used in actual use, which causes a waste of useless gears. However, this scheme can set three gears corresponding to the required load voltages of 3V, 5V and 8V to realize the conversion between each load voltage. Compared with the design idea of ​​linear grading, the gears can be designed specifically without having to design redundant transition gears between adjacent load voltages. In the scenario of realizing a wide range of voltage regulation, the number of gears that can be designed in this scheme is smaller, thereby reducing the complexity of the designed circuit.

[0029] In one illustrated embodiment, Figure 3 As shown, the feedback circuit input terminal 22 can be connected to the voltage output terminal 13, and is used to collect the load voltage outputted by the voltage output terminal 13 in real time, and when the gear selection switch 212 is in the connected state, the load voltage is outputted to the feedback voltage control circuit 211. One end of the gear selection switch 212 is connected to the feedback circuit input terminal 22, and the other end of the gear selection switch 212 is connected to the input end of the feedback voltage control circuit 211, and the output end of the feedback voltage control circuit 211 is connected to the feedback voltage input terminal 14. When the gear selection switch 212 is in different gears, the feedback voltage control circuit 211 can form a feedback loop including the gear resistance and / or gear capacitance array of the corresponding gear, and the size of the gear resistance value and the gear capacitance array value on the feedback loop is related to the load voltage indicated by the gear. In this solution, the gear selection switch 212 controls the gear resistance value and / or the gear capacitance array value on the feedback loop, and the feedback loop adjusts the load voltage outputted by the voltage output terminal 13 to a target feedback voltage matching the target gear, and outputs the target feedback voltage to the feedback voltage input terminal 14. When the target feedback voltage is not equal to the preset reference voltage, the voltage conversion module 12 adjusts the load voltage outputted by the voltage output terminal 13 of the voltage conversion module 12 to a target load voltage matching the target gear. The adjustment process can be completed based on the aforementioned one round of steps, or the load voltage can be adjusted to a target load voltage matching the target gear after multiple rounds of adjustment.

[0030] The gear resistors may be resistors with different resistance values ​​connected in series to the feedback voltage control circuit 211; the gear capacitor arrays may be capacitors with different capacitance values ​​connected in series to the feedback voltage control circuit 211. When the gear selection switch is in different gears, the corresponding gear resistors and / or gear capacitors are selectively added to the feedback loop to form a feedback loop including the gear resistors and / or gear arrays of the corresponding gears.

[0031] An error amplifier can be set inside the voltage conversion module 12 to receive the target feedback voltage value and the preset reference voltage value and calculate the difference between the two. When the target feedback voltage is not equal to the preset reference voltage, the voltage conversion module 12 generates a corresponding control signal for adjusting the duty cycle or switching frequency of the output voltage circuit, thereby adjusting the load voltage output by the voltage output end of the voltage conversion module 12 to the target load voltage of the target gear.

[0032] This program can be Figure 1 Based on the improvement Figure 1 The linear binning design of the DC-DC converter is improved to a nonlinear binning design to adapt to the scenario of wide range voltage regulation. See the following embodiments for details:

[0033] In one illustrated embodiment, Figure 4 As shown, the gear selection switch 212 can be used to select Figure 1The gear is set from low to high multi-level gear switch. The feedback voltage control circuit includes an initial resistor R0 and gear resistors R1, R2, ..., Rn of different levels. One end of each gear switch is connected to the voltage output terminal 13 of the voltage conversion module 12, and the other end is connected to the corresponding gear resistor. For example, the first gear switch from left to right is connected to the resistor R1, the second gear switch is connected to the resistor R2, and so on, the nth gear switch is connected to the resistor Rn. When each level of the gear switch is in the on state, the gear resistor connected to it can be added to the feedback loop formed between the voltage output terminal 13 and the feedback voltage input terminal 14 connected to the gear switch. For example, when the first gear switch is turned on, the resistor R1 will be added to the feedback loop of the gear switch, when the second gear switch is turned on, the resistor R2 will be added to the feedback loop of the gear switch, and so on, when the nth gear switch is turned on, the resistor Rn will be added to the feedback loop of the gear switch. When the gear selection switch is in different gears, the feedback voltage control circuit 211 can form a feedback loop including the gear resistance of the corresponding gear. Specifically, when any level of the gear switch is in the on state, the feedback voltage control circuit 211 can form a feedback circuit including the initial resistance R0, the gear resistance connected to the gear switches of this level and all levels before it. For example, when the first level gear switch is in the on state, the feedback voltage control circuit 21 can form a feedback circuit including the initial resistance R0 and the gear resistance R1. When the second level gear switch is in the on state, the feedback voltage control circuit 21 can form a feedback circuit including the initial resistance R0, the gear resistance R1, and the gear resistance R2. By analogy, when the nth level gear switch is in the on state, the feedback voltage control circuit 21 can form a feedback circuit including the initial resistance R0, R1, ..., Rn.

[0034] and Figure 1 The difference between the DC-DC converter designed in the related art shown is that Figure 1The gears are linear gears, that is, the gear resistance values ​​of each gear are the same, and the voltage change rate when each gear is switched is also the same. The gears in this scheme are nonlinear gears, and the gear resistance values ​​of each gear can be different. The resistance value of the gear resistor of each gear can be flexibly designed according to the power consumption characteristics of the load equipment. For example, in some scenarios, fine-tuned gear changes can be designed for key voltage ranges, while larger steps are used in other voltage ranges. For example, for a voltage range with uneven voltage change distribution, such as the load voltages required by the load equipment are 1V, 1.1V, 1.2V, 4V, and 10V, in this scheme, corresponding gears and gear resistors can be designed for each load voltage to meet the power consumption requirements of each load voltage. At this time, five gears can be designed, corresponding to 1V, 1.1V, 1.2V, 4V, and 10V, respectively. For the linear step design, if the step of different gears designed between the voltage variation range [1V, 10V] is 0.1V, then 11 gears such as 1V, 1.1V, 1.2V, ..., 10V need to be designed. If the step is greater than 0.1V, although the number of gears can be reduced, the accuracy of the output load voltage cannot be guaranteed. Therefore, for the voltage range with uneven voltage variation distribution, this solution can simplify the design by reducing unnecessary gears, while still meeting the fine control requirements within a specific voltage range.

[0035] Figure 4 The figure shows a scheme for setting the corresponding gear according to the requirement of the finite number of discrete load voltages to be output by the load device 17. Figure 4 Different from the application scenarios, in some scenarios, the load voltage required by the load device 17 is continuously adjustable, and its voltage change is not linear, which makes the linear gear also unsuitable for the application scenarios of the load device 17. Taking the load device 17 as a neural stimulator as an example, the change of the electrical stimulation signal in each cycle is not linear, and the change between the voltages of each gear increases exponentially. At this time, if a DC-DC converter with a linear gear is used, since the voltage change between each gear is a fixed linear step, in order to cover the required larger voltage range, the linear gear design usually needs to add a large number of gears to meet the requirements of the voltage range.

[0036] In one illustrated embodiment, Figure 4 As shown, this plan further Figure 3 The resistance design of the graded resistor is improved to better adapt to the application scenario where the load voltage is continuously adjustable and its voltage change is not linear.

[0037] Specifically, the resistance value of the gear resistor connected to any level of gear switch can be positively correlated with the conversion efficiency between the load voltages indicated by the gear switch of this level and the gear switch of the previous level respectively; and / or, the resistance value of the gear resistor connected to any level of gear switch is positively correlated with the resistance value of the initial resistor.

[0038] For example, for the n-th level gear switch, the resistance value of the gear resistor connected thereto can be determined using Formula 1:

[0039] (Formula 1)

[0040] Wherein, η is the conversion rate between the load voltage of the n-th gear switch and the load voltage of the n-1-th gear switch, and R is the resistance value of the initial resistor.

[0041] The conversion rate can be calculated using Formula 2:

[0042] (Formula 2)

[0043] in, Indicates the load voltage indicated by the n-1th gear position, Indicates the load voltage indicated by the nth gear position.

[0044] This scheme designs Formula 1 from the perspective of the power demand that the load voltage of the load device needs to change at a specified rate of change. The resistance value of the gear resistor of each gear calculated by Formula 1 can meet the load voltage of adjacent gears that changes at a specified rate of change η, thereby adapting to the power demand scenario where the load voltage of the load device needs to change at a specified rate of change.

[0045] In addition, Figure 5 For example, assuming that the adjustable voltage range of the adjustable voltage conversion device 2 is set to 1-15V, the conversion rate is required to be no less than 90%, the preset reference voltage of the device is set to 0.5V, R0=30kΩ, R*=30kΩ. At this time, it needs to be divided into 27 levels, and the range of the graded resistance is 6.67~868.6kΩ to meet this requirement. Figure 1 If the linear grading design structure is used to achieve the above requirements, the minimum grading is 0.1V, and 141 grading levels are required to meet the requirement. When the linear grading is also 27 levels, the minimum step is 0.54V, and the lowest conversion rate occurs when the 1V jumps to the 1.54V level, with a conversion rate of only 65%. It can be seen that this solution can also achieve the technical effect of reducing the complexity of circuit design or improving the conversion rate.

[0046] In one illustrated embodiment, Figure 5As shown, the initial resistor R may include a first initial resistor R0 and a second initial resistor R*, and the resistance value of the second initial resistor R* is positively correlated with the minimum value of the output voltage range of the voltage conversion device 2. Figure 5 As shown, at the beginning of the design of the voltage conversion device 2, based on the fact that the first initial resistor R0 may not meet the minimum value requirement of the output voltage range, at this time, it is necessary to add the second initial resistor R* to make it meet the minimum value requirement of the output voltage range. Of course, since the first initial resistor R0 and the second initial resistor R* are connected in series, the first initial resistor R0 and the second initial resistor R* can be designed as an integral initial resistor R, and this specification does not impose any restrictions on this.

[0047] The above shows a solution based on resistor grading or capacitor array grading. The more gears there are, the more gear resistors or gear capacitor arrays are required, and the number of gears is proportional to the complexity of circuit design, which will eventually increase the complexity of circuit design. In this regard, this solution further improves the structure of the voltage feedback module 21, abandons the design solution based on the mutual cooperation of the gear resistor and the gear array to adjust the feedback voltage, so as to simplify the circuit design complexity of the voltage feedback module 21, and specifically refers to the following embodiments:

[0048] In one illustrated embodiment, Figure 6 As shown, the type of the feedback voltage control circuit 211 can be an exponential circuit 612, and the feedback circuit input terminal 22 can be an exponential voltage input terminal. The type of the gear selection switch 212 can be a linear voltage grading circuit 611, and the linear voltage grading circuit 611 can be cascaded with the exponential circuit 612 to control the magnitude of the feedback voltage input to the exponential voltage input terminal. When the linear voltage grading circuit 611 is in the target gear, the exponential circuit 612 can adjust the feedback voltage input to the exponential voltage input terminal to match the target gear and output it to the feedback voltage input terminal 14.

[0049] Specifically, the linear voltage grading circuit 611 can input a feedback voltage to the exponential circuit 612 according to different gear requirements. The exponential circuit 612 adjusts the feedback voltage to a target feedback voltage that matches the target gear and outputs it to the feedback voltage input terminal 14. When the target feedback voltage is not equal to a preset reference voltage, the voltage conversion module 12 adjusts the load voltage output from the voltage output terminal 13 of the voltage conversion module to a target load voltage that matches the target gear.

[0050] In this embodiment, the linear voltage grading circuit 611 can output feedback voltages of different gears according to voltage requirements, and the exponential circuit 612 adjusts the feedback voltage of the corresponding gear to a target feedback voltage that matches the target gear. Compared with the method of adjusting the feedback voltage based on the cooperation of the grading resistor and the grading switch, in the scenario where the load voltage has a large range of variation and the load voltage changes continuously, the linear voltage grading circuit 611 and the exponential circuit 612 will not be affected by the load voltage variation range and the requirements of whether the load voltage is continuous as the former, and in the scenario where the load voltage has a large range of variation and the load voltage changes continuously, the design structure can be simplified, the number of components can be reduced, and the circuit complexity can be reduced.

[0051] In an embodiment shown, this specification provides a neurostimulator, which can be applied with an adjustable-level voltage conversion device as shown in any of the above embodiments. For the application scenario where the load voltage of the neurostimulator has a large range of variation and the load voltage changes continuously, the adjustable-level voltage conversion device designed in this solution can reduce the design complexity of the level circuit.

[0052] In an illustrated embodiment, the present specification further provides an electronic device, which can be applied with the voltage conversion device with adjustable gear as illustrated in any of the aforementioned embodiments.

Claims

1. A voltage conversion device with adjustable gear, characterized in that: The device comprises a voltage feedback module and a voltage conversion module, wherein the voltage feedback module comprises a gear selection switch and a feedback voltage control circuit, and the output end of the feedback voltage control circuit is connected to the feedback voltage input end of the voltage feedback module; wherein: One end of the gear selection switch is connected to the input end of the feedback circuit, and the other end is connected to the input end of the feedback voltage control circuit, and the feedback circuit input end is connected to the voltage output end of the voltage conversion module; wherein, when the gear selection switch is in different gears, the feedback voltage control circuit forms a feedback loop including the gear resistor and / or the gear capacitor array of the corresponding gear, and the resistance value of the gear resistor and the capacitance value of the gear capacitor array on the feedback loop are related to the load voltage indicated by the gear; The gear selection switch includes a multi-stage gear switch with gears from low to high, the feedback voltage control circuit includes an initial resistor and gear resistors of different levels, one end of each gear switch is connected to the input end of the feedback circuit, and the other end is connected to the gear resistor corresponding to it, and when each gear switch is in the on state, the gear resistor connected to it is added to the feedback loop; when the gear selection switch is in different gears, the feedback voltage control circuit forms a feedback loop including the gear resistor of the corresponding gear, including: when any gear switch is in the on state, the feedback voltage control circuit forms a feedback circuit including the initial resistor and the gear resistors respectively connected to the gear switches of this level and all the previous levels; The resistance value of the gear resistor connected to any level of gear switch is positively correlated with the conversion efficiency between the load voltages indicated by the gear switch of this level and the gear switch of the previous level respectively; and / or, the resistance value of the gear resistor connected to any level of gear switch is positively correlated with the resistance value of the initial resistor; For the nth level gear switch, the resistance of the gear resistor connected thereto is [(η-1)^(-n)×R]; wherein η is the conversion ratio between the load voltage of the nth level gear switch and the load voltage of the n-1th level gear switch, and R is the resistance value of the initial resistor; When the gear selection switch is in the target gear, the feedback voltage control circuit adjusts the feedback voltage inputted from the feedback circuit input terminal to a target feedback voltage matching the target gear and outputs it to the feedback voltage input terminal; When the target feedback voltage is not equal to a preset reference voltage, the voltage conversion module adjusts the load voltage outputted from the voltage output terminal of the voltage conversion module to a target load voltage matching the target gear; wherein the load voltage values ​​of each gear are nonlinearly distributed.

2. The device according to claim 1, characterized in that The initial resistor includes a first initial resistor and a second initial resistor, and the resistance value of the second initial resistor is positively correlated with the minimum value of the output voltage range of the voltage conversion device.

3. A neural stimulator, characterized in that: The neurostimulator is equipped with a device as described in any one of claims 1-2.

4. An electronic device, characterized in that: The electronic device is equipped with the device according to any one of claims 1-2.

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