Circuit structure and method for realizing power supply adaptive drive

Abstract

The present invention relates to a circuit structure for realizing adaptive power supply drive, comprising a voltage detection module for detecting the power supply voltage value of the circuit power supply, and determining the indication signal output to the LDO module and the indication signal output to the drive variable drive level module according to the magnitude of the power supply voltage value; the LDO module, connected to the voltage detection module, for converting the power supply voltage into a gate drive voltage; and the drive variable drive level module, for converting the input signal into the gate drive signal required by the output end. The present invention also relates to a method for realizing adaptive power supply drive. The circuit structure and method for realizing adaptive power supply drive of the present invention can not only enable the circuit to obtain the highest possible withstand voltage, but also obtain better electrical performance and sound quality when working at a relatively low power supply voltage, and quickly improve the withstand voltage of the output tube to adapt to the fluctuation of the power supply voltage, thereby ensuring that the circuit is not damaged or the high-voltage protection is not easily triggered. The method is simple, easy to implement, and has significant effects.

Description

Technical Field

[0001] The present invention relates to the field of Class D audio power amplifiers, and in particular to the field of power supply voltage design, and specifically to a circuit structure and method for realizing power supply adaptive driving. Background Art

[0002] Class D audio amplifiers, especially those using BCD technology, typically have a wide supply voltage range. This means that the same circuit can have a supply voltage that is sometimes very high or sometimes very low in different applications. Furthermore, in most applications, due to cost or other factors, the power supply system often cannot provide a very stable voltage, which means that the amplifier's supply voltage will experience large random fluctuations.

[0003] Existing technologies address this issue by using redundant or conservative designs to cover wide voltage and fluctuation scenarios. For example, a circuit with a maximum withstand voltage of 30V is designed to operate below 26V. This allows stable operation with power supplies of 12V, 16V, 20V, 26V, and so on, and prevents device breakdown and damage from small voltage fluctuations.

[0004] The disadvantage is that key electrical performance is not optimal for low-voltage applications compared to high-voltage applications. The output transistor gate drive voltage is generally designed to be lower to increase the breakdown voltage, at the expense of a higher on-resistance (Rds(on)) at low gate drive voltages. The output transistor gate drive current is also designed to be lower to reduce voltage overshoot and prevent device breakdown, at the expense of increased switching losses, distortion, and reduced sound quality.

[0005] Furthermore, large fluctuations in the power supply voltage can still cause device breakdown and damage, thus limiting the maximum operating power supply voltage to a certain extent. To overcome voltage fluctuations, the maximum operating voltage must be lowered, limiting the circuit's application range. Switching to a higher-voltage circuit significantly increases product costs, which are ultimately passed on to users.

[0006] Existing technologies typically use a fixed output transistor gate drive voltage. To control the Miller plateau and the Miller effect, the drive current is precisely controlled when driving the gate terminal to achieve a balance between drive efficiency, EMI, and reliability. For example, a high drive current is used at the beginning of charging Cgd, a lower drive current is used when entering the Miller plateau to charge Cgd, and a higher drive current is used after the Miller plateau, creating a segmented drive method.

[0007] The fixed output transistor gate drive voltage mentioned above may have different options depending on the process, withstand voltage requirements, and on-resistance requirements. There are also multiple design options for the drive current in the prior art.

[0008] In terms of drive structure, the use of multi-stage buffers in series is a common form, while the more complex ones adopt a feedback design scheme.

[0009] A drawback of existing technologies is that their optimal performance is typically achieved near a fixed power supply voltage, often close to the maximum operating voltage. Performance is poorer, or suboptimal, when operating in the lower voltage range. Furthermore, the maximum operating voltage is limited, and for redundancy purposes, the designed withstand voltage is significantly lower than the device withstand voltage. This is primarily due to the fixed output transistor gate drive voltage and relatively fixed drive current design. Summary of the Invention

[0010] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a circuit structure and method for realizing power supply adaptive driving with good performance, good stability and significant effect.

[0011] In order to achieve the above-mentioned purpose, the circuit structure and method for realizing power supply adaptive driving of the present invention are as follows:

[0012] The circuit structure for realizing power supply adaptive driving has the following main features:

[0013] The voltage detection module is used to detect the power supply voltage value of the circuit power supply and determine the indication signal output to the LDO module and the indication signal output to the variable drive level module according to the size of the power supply voltage value;

[0014] An LDO module, connected to the voltage detection module, is used to convert the power supply voltage into a gate drive voltage, and the gate drive voltage generates different gate drive voltage values according to the output indication signal of the voltage detection module;

[0015] The variable drive level module is connected to the voltage detection module and the LDO module, and is used to convert the input signal into the gate drive signal required by the output end, and adjust the drive current size according to the output indication signal of the voltage detection module.

[0016] Preferably, the circuit structure further includes a gate of an upper input tube and a lower output tube, wherein the gate of the upper output tube and the gate of the lower output tube are both connected to the variable drive stage module, the source of the upper output tube and the drain of the lower output tube are connected and connected to the output end, the drain of the upper output tube is connected to the power supply, and the source of the lower output tube is grounded.

[0017] The method for realizing power supply adaptive driving by using the above circuit structure is mainly characterized in that the method comprises the following steps:

[0018] (1) Divide the power supply voltage into intervals and determine the corresponding relationship between different intervals and the gate drive voltage and gate drive current. Each interval corresponds to a gate drive voltage, and different power supply voltages set different gate drive currents.

[0019] (2) Detect the current power supply voltage value;

[0020] (3) Determine the current power supply voltage range, control gate drive voltage and control gate drive current;

[0021] (4) Continue with step (2) and change the gate drive voltage and gate drive current in real time according to the changes in power supply and voltage.

[0022] Preferably, the higher the power supply voltage interval value in step (1), the smaller the corresponding gate drive voltage is, and the lower the power supply voltage interval value is, the larger the corresponding gate drive voltage is.

[0023] Preferably, in step (1), the higher the power supply voltage is, the smaller the gate drive current is, and the lower the power supply voltage is, the larger the gate drive current is.

[0024] The circuit structure and method for realizing adaptive power supply drive of the present invention can not only enable the circuit to obtain the highest possible withstand voltage, but also obtain better electrical performance and sound quality when working at a relatively low power supply voltage. When the power supply is unstable and suddenly increases, since the gate drive voltage and gate drive current will change in real time with the voltage, the withstand voltage can be quickly increased, the output tube can be prevented from breakdown and damage, and the normal operation of the circuit can be maintained. The present invention can quickly increase the withstand voltage of the output tube by changing (reducing) the gate drive voltage and reducing the gate drive current to adapt to the fluctuation of the power supply voltage (voltage increase), ensure the normal operation of the circuit, and ensure that the circuit is not damaged or not easily triggering high-voltage protection. The method is simple, easy to implement, and has significant effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. 1 is a relationship diagram between the drain current Id and the source-drain voltage Vds of the circuit structure for realizing power adaptive driving of the present invention.

[0026] Figure 2 Schematic diagram of the circuit structure for realizing power supply adaptive driving according to the present invention.

[0027] Figure 3 The figure is a schematic diagram of the overall flow of the method for realizing power supply adaptive driving of the present invention. DETAILED DESCRIPTION

[0028] In order to more clearly describe the technical content of the present invention, further description is given below in conjunction with specific embodiments.

[0029] The circuit structure for realizing power supply adaptive driving of the present invention includes:

[0030] The voltage detection module is used to detect the power supply voltage value of the circuit power supply and determine the indication signal output to the LDO module and the indication signal output to the variable drive level module according to the size of the power supply voltage value;

[0031] An LDO module, connected to the voltage detection module, is used to convert the power supply voltage into a gate drive voltage, and the gate drive voltage generates different gate drive voltage values according to the output indication signal of the voltage detection module;

[0032] The variable drive level module is connected to the voltage detection module and the LDO module, and is used to convert the input signal into the gate drive signal required by the output end, and adjust the drive current size according to the output indication signal of the voltage detection module.

[0033] Preferably, the circuit structure further includes a gate of an upper input tube and a lower output tube, wherein the gate of the upper output tube and the gate of the lower output tube are both connected to the variable drive stage module, the source of the upper output tube and the drain of the lower output tube are connected and connected to the output end, the drain of the upper output tube is connected to the power supply, and the source of the lower output tube is grounded.

[0034] The method of the present invention for realizing power supply adaptive driving by using the above circuit structure comprises the following steps:

[0035] (1) Divide the power supply voltage into intervals and determine the corresponding relationship between different intervals and the gate drive voltage and gate drive current. Each interval corresponds to a gate drive voltage, and different power supply voltages set different gate drive currents.

[0036] (2) Detect the current power supply voltage value;

[0037] (3) Determine the current power supply voltage range, control gate drive voltage and control gate drive current;

[0038] (4) Continue with step (2) and change the gate drive voltage and gate drive current in real time according to the changes in power supply and voltage.

[0039] Preferably, the higher the power supply voltage interval value in step (1), the smaller the corresponding gate drive voltage is, and the lower the power supply voltage interval value is, the larger the corresponding gate drive voltage is.

[0040] Preferably, in step (1), the higher the power supply voltage is, the smaller the gate drive current is, and the lower the power supply voltage is, the larger the gate drive current is.

[0041] In a specific embodiment of the present invention, the working principle of the present invention is as follows:

[0042] The output tube operates in the linear region, and the on-resistance and the output tube gate drive voltage have the following relationship:

[0043] Ron = 1 / (μ × Cox × W / L × (Vgs - Vth)), where μ is the carrier mobility, Cox is the gate oxide capacitance per unit area, W and L are the trench width and length of the output transistor, respectively, Vgs is the gate-source voltage (gate drive voltage), and Vth is the turn-on threshold voltage. It can be seen that Ron is negatively correlated with Vgs: the higher the gate drive voltage, the lower the on-resistance, and the lower the gate drive voltage, the higher the on-resistance.

[0044] The breakdown voltage BV is also related to Vgs, which is manifested as the larger the Vgs, the lower the breakdown voltage (low withstand voltage), and the smaller the Vgs, the higher the breakdown voltage (high withstand voltage).

[0045] like Figure 1 As shown in FIG, the relationship diagram between the drain current Id and the source-drain voltage Vds reveals the relationship diagram between the above-mentioned output tube characteristics and Vgs.

[0046] In the linear region on the left, the larger the Vgs, the greater the slope of Id versus Vds, that is, the smaller the on-resistance; on the right, the larger the Vgs, the smaller the breakdown voltage.

[0047] Furthermore, the magnitude of the drive current directly affects the charging process of the parasitic capacitances of the output transistors, Cgs and Cgd. Due to the presence of parasitic inductance, overshoot and ringing are inevitable. To mitigate these effects, the drive current can be reduced without changing the aforementioned parasitic parameters, thereby reducing overshoot and ringing and minimizing output transistor breakdown. The trade-off is increased level shift (i.e., edge time), increased power consumption, increased distortion, and reduced sound quality.

[0048] In summary, there's a trade-off between the output transistor's gate drive voltage (Vgs) and current (Ig), and the output transistor's withstand voltage, on-resistance, and power dissipation and distortion. A design employing relatively fixed Vgs and Ig values inevitably sacrifices performance under certain conditions. For example, while lower Vgs and Ig provide higher withstand voltage, they also increase on-resistance, power dissipation, and distortion, leading to lower sound quality. Conversely, higher Vgs and Ig reduce withstand voltage.

[0049] The circuit structure of the present invention realizes power supply adaptive driving based on the above circuit structure, such as Figure 2As shown, the driver stage and output tube structure of a Class D audio power amplifier typically includes a driver stage, an LDO for generating gate drive voltage, and a voltage detection module for high-voltage and low-voltage protection of the power supply voltage. The structure of the present invention is unique in that: 1) one of the outputs of the voltage detection module is used to control the LDO to generate different gate drive voltage values; 2) the second output of the voltage detection module is used to control a variable drive stage, where variable drive refers to the drive current; and 3) the variable drive stage.

[0050] The voltage detection module can detect the power supply voltage value of the circuit and determine the indication signal output to the LDO based on the power supply voltage value. For example, when the power supply voltage is in the ranges of 10V-21V, 21V-24V, 24V-27V, and 27V-30V, the indication signals output to the LDO are logical control signals of 00, 01, 10, and 11, respectively. Similarly, the voltage detection module can detect the power supply voltage value of the circuit and determine the indication signal output to the variable drive stage based on the power supply voltage value. For example, when the power supply voltage is in the ranges of 10V-21V and 21V-30V, the indication signals output are logical control signals of 0 and 1, respectively.

[0051] The LDO module converts the power supply voltage into the gate drive voltage required by the output transistors. In the present invention, this gate drive voltage generates different gate drive voltage values based on the output indication signal from the voltage detection module. For example, 00 corresponds to a 6V DC voltage, 01 corresponds to a 6V DC voltage, 10 corresponds to a 5V DC voltage, and 11 corresponds to a 4V voltage. Whenever the input indication signal changes, the output voltage changes immediately.

[0052] The variable driver stage converts the input signal into the gate drive signals required by the upper and lower output transistors. Compared to the driver stage in the prior art, the driver stage of the present invention can adjust the drive current based on the output indication signal from the voltage detection module. For example, if the indication signal is 0, the drive current is increased, and if the indication signal is 1, the drive current is decreased. Whenever the input indication signal changes, the driver stage immediately changes the drive current.

[0053] The logic signals described above are not limited to the number or data bit widths described in the examples. Their function is to properly adjust the gate drive voltage and gate drive current based on the power supply voltage. The adjustment scheme, specifically the relationship between the power supply voltage, gate drive voltage, and gate drive current, is designed based on the chip process used for the circuit and can be well adapted to the actual circuit operation.

[0054] The voltage detection module of the present invention has new functions and features compared to the prior art. It outputs two control signals: a gate drive voltage control signal and a gate drive current control signal. These two signals are generated based on the power supply voltage detection results described in the present invention. They can control the voltage output by the LDO module and adjust the gate drive current generated by the variable drive stage. Therefore, the most innovative module of the present invention should be the voltage detection module, followed by the variable drive stage (which accepts the LDO output as the gate drive voltage and has a variable gate drive current structure), and finally the LDO module (with adjustable output voltage). The three work together to produce new beneficial effects.

[0055] The present invention uses a dynamic and adaptive design strategy to achieve better balance under the same conditions. The present invention implements a method for power supply adaptive driving based on the above circuit structure, such as Figure 3 As shown, wherein the following steps are included:

[0056] Step 1: Divide the power supply voltage into intervals and determine the gate drive voltages corresponding to different intervals. The power supply voltage can be divided into two intervals: high and low, or three intervals: high, medium, and low, or a greater number of intervals. Each interval corresponds to a gate drive voltage. Typically, the relationship between the power supply voltage interval and the gate drive voltage value is: the higher the power supply voltage interval value, the smaller the corresponding gate drive voltage, and the lower the power supply voltage interval value, the larger the corresponding gate drive voltage.

[0057] Step 2: Divide the power supply voltage into intervals and determine the gate drive current corresponding to each interval. Different power supply voltages set different gate drive currents. Generally speaking, the higher the power supply voltage, the smaller the gate drive current, and the lower the power supply voltage, the larger the gate drive current.

[0058] Step 3: Detect the current power supply voltage value of the circuit.

[0059] Step 4: Determine the current power supply voltage range and control the gate drive voltage.

[0060] Step 5: Determine the current power supply voltage range and control the gate drive current.

[0061] Step 6: When the power supply voltage changes, the gate drive voltage and gate drive current respond to changes in real time and dynamically to cope with unstable power supply conditions and achieve power supply self-adaptation.

[0062] The specific embodiment of the method for realizing power supply adaptive driving of the present invention is as follows:

[0063] Assuming a circuit under certain process conditions, when the gate drive current is small, the breakdown voltage of its output tube is 24V when Vgs = 6V, 27V when Vgs = 5V, and 30V when Vgs = 4V.

[0064] According to step 1, first determine the gate drive voltage range. Set 27V to 30V as the very high voltage range, corresponding to a gate drive voltage of 4V, set 24V to 27V as the high voltage range, corresponding to a gate drive voltage of 5V, set 21V to 24V as the medium-high voltage range, corresponding to a gate drive voltage of 6V, and set the range below 21V as the medium-low voltage range, corresponding to a gate drive voltage of 6V.

[0065] According to step 2, the interval division of the gate drive current is determined again, 21V to 30V is set as the high voltage interval, and the corresponding gate drive current is small, and below 21V is set as the low voltage interval, and the corresponding gate drive current is large.

[0066] According to step 3, the current power supply voltage value of the circuit is detected. For example, the current voltage is 20V.

[0067] According to step 4, it can be determined that the current gate drive voltage range is divided into a medium and low voltage range, and the gate drive voltage output is controlled to be 6V.

[0068] According to step 5, it can be determined that the current gate drive current interval is divided into a low voltage interval, and the gate drive current is controlled to be a high current drive.

[0069] According to step 6, the process from step 3 to step 4 is repeated, and the settings of the gate drive voltage and the gate drive current can be changed in real time.

[0070] Assuming that when step 3 is repeated, the power supply voltage detection value is 22V, then in step 4, the gate drive voltage is still 6V, and in step 5, the gate drive current is changed to a low current drive.

[0071] Assuming that when step 3 is repeated, the power supply voltage detection value is 25V, then in step 4, the gate drive voltage is changed to 5V, and in step 5, the gate drive current is changed to a low current drive.

[0072] Compared to the fixed gate drive voltage and relatively fixed gate drive current settings in the prior art, this embodiment has significant advantages. Assume that there are two prior art solutions: Solution A has a gate drive voltage of 4V and a low gate drive current, and Solution B has a gate drive voltage of 6V and a high gate drive current. These solutions are compared with the solutions in this embodiment.

[0073] 1) When the power supply voltage is 20V, the gate drive voltage of this embodiment is 6V, and the gate drive current is high current drive, which is superior to Solution A and consistent with Solution B. This is mainly because the high gate drive voltage results in lower on-resistance, high gate drive current, low power consumption, low distortion, and good sound quality.

[0074] 2) When the power supply voltage is 22V, the gate drive voltage of this embodiment is 6V, and the gate drive current is a small current drive, which is still better than solution A. Compared with solution B, the gate drive voltage is reduced, the withstand voltage is higher, and the reliability is better.

[0075] 3) When the power supply voltage is 25V, the gate drive voltage of this embodiment is 5V, and the gate drive current is a small current drive. At this time, the B solution may have broken down or protected. Compared with the A solution, the high gate drive voltage of this embodiment brings a smaller on-resistance.

[0076] In summary, the advantages of the embodiments of the present invention are significant, and the circuit can achieve a balance between voltage resistance and performance at any power supply voltage. However, the existing technology that uses fixed gate drive voltage and drive current has only a very small voltage range for the optimal working state, and cannot adapt well to changes in the power supply voltage. In particular, if the power supply voltage rises instantaneously, or even if the voltage rises frequently, the circuit of solution B will be very easy to be damaged, or it will easily enter the protection state and fail to work normally when there is a high-voltage protection function. The solution of the present invention can overcome the early breakdown voltage caused by the abnormal increase of the power supply by quickly reducing the gate drive voltage and reducing the gate drive current, and can also quickly return to the optimal performance state after the power supply voltage returns to normal.

[0077] The dynamic adaptive design step of the present invention is a more reasonable embodiment of the present invention, but is not limited to this embodiment. For example, the gate drive current can be determined first and then the gate drive voltage can also achieve the expected effect of the method of the present invention, and the corresponding structural invention remains unchanged. The gate drive voltage determined by the prior art is fixed, and the gate drive current determined is also a drive mode, which can only adapt to a narrow operating voltage or a narrow optimal operating voltage range. Through the dynamic adaptive design step of the present invention, it is possible to well match the optimal drive voltage and drive current for different voltage conditions according to the selected process conditions, and can well respond to fluctuations in the power supply voltage, thereby improving circuit performance and ensuring circuit reliability.

[0078] The key protection point of the present invention lies in determining the corresponding relationship between the power supply voltage range and the gate drive voltage and gate drive current. The more intervals, gate drive voltage steps, and gate drive current steps, the more significant the effect, but this also increases implementation cost and design complexity. The key to the present invention's method is the rational selection of the power supply voltage range, gate drive voltage, gate drive current, and their corresponding relationship. These factors determine performance characteristics such as the circuit's withstand voltage, on-resistance, power consumption, temperature rise, distortion, and sound quality.

[0079] A key aspect of the present invention lies in the voltage detection module's output of an indication signal to control the LDO and driver stages that determine the gate drive voltage and current. Existing voltage detection modules often provide high and low voltage protection and do not control the generation of gate drive voltage or the change in gate drive current.

[0080] A beneficial feature of the method and structure of the present invention is that it can adapt to large power supply fluctuations by quickly and dynamically adjusting the gate drive voltage and gate drive current, achieving ideal balanced performance under the application conditions. Existing technologies either sacrifice withstand voltage or on-resistance, power consumption, temperature rise, distortion, sound quality, and other performance. If feedback technology is used, the response speed is inferior to the present invention.

[0081] The present invention can greatly enhance the performance of a Class D audio power amplifier with a wide power supply voltage operating range under different operating voltage conditions.

[0082] The present invention does not require a special or complex structure for implementation, and is economical. The present invention is not limited to the power supply voltage interval division method, number, and range, the gate drive voltage value, and the number of gate drive current gradations illustrated in the embodiments. The corresponding relationship between the power supply voltage and the gate drive voltage and gate drive current depends on the actual circuit process and design, and is not limited to the embodiments.

[0083] Compared to existing structures, the present invention can select the most appropriate gate drive voltage and gate drive current according to different power supply voltages, achieving power supply adaptation. This avoids problems such as insufficient withstand voltage, excessive on-resistance, excessive power consumption, excessive heat generation, excessive distortion, and degraded sound quality when the circuit operates under non-ideal power supply voltages. The circuit can achieve relatively ideal electrical performance and sound quality under various power supply voltages. Therefore, it is suitable for circuits with a wide operating voltage range.

[0084] Since the design does not have feedback, it can respond well to real-time fluctuations in the power supply voltage and is less likely to cause output tube breakdown or trigger high-voltage protection. Therefore, it is suitable for application scenarios where the power supply voltage is not stable.

[0085] The voltage detection structure is usually similar to the high-voltage protection detection structure, which is easy to implement and not costly. To make the LDO generate different gate drive voltages, it can be achieved by changing the input reference voltage and the voltage divider resistor ratio, which is relatively easy to implement.

[0086] The circuit structure and method for realizing adaptive power supply drive of the present invention can not only enable the circuit to obtain the highest possible withstand voltage, but also obtain better electrical performance and sound quality when working at a relatively low power supply voltage. When the power supply is unstable and suddenly increases, since the gate drive voltage and gate drive current will change in real time with the voltage, the withstand voltage can be quickly increased, the output tube can be prevented from breakdown and damage, and the normal operation of the circuit can be maintained. The present invention can quickly increase the withstand voltage of the output tube by changing (reducing) the gate drive voltage and reducing the gate drive current to adapt to the fluctuation of the power supply voltage (voltage increase), ensure the normal operation of the circuit, and ensure that the circuit is not damaged or not easily triggering high-voltage protection. The method is simple, easy to implement, and has significant effects.

[0087] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Accordingly, the specification and drawings are to be regarded as illustrative rather than restrictive.

Claims

1. A circuit structure for realizing power supply adaptive driving, characterized in that: The circuit structure includes: The voltage detection module is used to detect the power supply voltage value of the circuit power supply and determine the indication signal output to the LDO module and the indication signal output to the variable drive level module according to the size of the power supply voltage value; An LDO module, connected to the voltage detection module, is used to convert the power supply voltage into a gate drive voltage, and the gate drive voltage generates different gate drive voltage values according to the output indication signal of the voltage detection module; A drive variable drive level module is connected to the voltage detection module and the LDO module, and is used to convert the input signal into the gate drive signal required by the output end, and adjust the drive current according to the output indication signal of the voltage detection module; Among them, the higher the power supply voltage value, the smaller the corresponding gate drive voltage, the smaller the gate drive current, and the higher the output tube withstand voltage; the lower the power supply voltage value, the larger the corresponding gate drive voltage, and the larger the gate drive current.

2. The circuit structure for realizing power supply adaptive driving according to claim 1, characterized in that: The circuit structure further includes an upper output tube and a lower output tube. The gate of the upper output tube and the gate of the lower output tube are both connected to the variable drive stage module. The source of the upper output tube and the drain of the lower output tube are connected and connected to the output end. The drain of the upper output tube is connected to the power supply, and the source of the lower output tube is grounded.

3. A method for realizing power supply adaptive driving using the circuit structure of claim 1, characterized in that: The method comprises the following steps: (1) Divide the power supply voltage into intervals and determine the corresponding relationship between different intervals and the gate drive voltage and gate drive current. Each interval corresponds to a gate drive voltage, and different power supply voltages set different gate drive currents; (2) Detect the current power supply voltage value; (3) Determine the current power supply voltage range, control gate drive voltage and control gate drive current; (4) Continue with step (2) and change the gate drive voltage and gate drive current in real time according to the changes in power supply and voltage.

4. The method for realizing power supply adaptive driving according to claim 3, characterized in that: The higher the power supply voltage interval value in step (1), the smaller the corresponding gate drive voltage is; the lower the power supply voltage interval value, the larger the corresponding gate drive voltage is.

5. The method for realizing power supply adaptive driving according to claim 3, characterized in that: The higher the power supply voltage interval value in step (1), the smaller the gate drive current is, and the lower the power supply voltage interval value is, the larger the gate drive current is.

Images