Inductive current mode regulation circuit, method and light emitting diode driving apparatus

Abstract

The application provides an inductance current mode regulation circuit, a method and a light emitting diode driving device, and belongs to the field of light emitting diode driving. A first time acquisition module is used for multiplying and signal converting the change time corresponding to the sampling voltage in the on time of the switch tube to obtain a first time signal. A third time acquisition module is used for multiplying and signal converting the change time corresponding to the sampling voltage of the sampling resistor in the on time of the switch tube to obtain a third time signal. A time comparison module is used for obtaining an off time reference adjustment signal according to the first time signal and the second time signal. Alternatively, the time comparison module is used for obtaining an off time reference adjustment signal according to the third time signal and the second time signal to update the off time of the switch tube, regulate the working mode of the inductance current, and solve the problem that the different inductance current working mode switching cannot be accurately realized due to the low detection accuracy in the prior art.

Description

Technical Field

[0001] This application belongs to the field of light-emitting diode driving technology, and particularly relates to an inductor current mode control circuit, method, and light-emitting diode driving device. Background Technology

[0002] Light-emitting diodes (LEDs), as a new generation of green and energy-saving lighting sources, possess numerous advantages such as high luminous efficiency, long lifespan, fast response speed, and low energy consumption. They are now widely used in various scenarios, including indoor lighting, outdoor engineering lighting, automotive lighting, and industrial backlighting. LEDs are driven by a BUCK step-down driver circuit, and the inductor energy release state is determined in real time through inductor current zero-crossing detection (or inductor demagnetization detection). This, in turn, coordinates with the circuit to adjust the switching timing, enabling the switching of different inductor current operating modes.

[0003] However, in traditional technology, the zero-crossing detection of inductor current (or inductor demagnetization detection) is achieved through the parasitic capacitance of the switching transistor in the drive circuit, resulting in low detection accuracy and an inability to accurately switch between different inductor current operating modes. Summary of the Invention

[0004] The purpose of this application is to provide an inductor current mode control circuit, method, and light-emitting diode driving device, which aims to solve the problem that the low detection accuracy in traditional technology makes it impossible to accurately switch between different inductor current operating modes.

[0005] This application provides an inductor current-mode control circuit applied to a light-emitting diode (LED) driving circuit. The LED driving circuit includes a switching transistor, a sampling resistor, and an inductor. A first terminal of the switching transistor is connected to the inductor, and a second terminal of the switching transistor is connected to the sampling resistor. The inductor current-mode control circuit includes: A logic control module is connected to the control terminal of the switching transistor and is used to control the switching transistor's on / off state. The first-time acquisition module is connected to the common connection terminal of the switching transistor and the sampling resistor. It is used to perform multiplication and signal conversion on the change time corresponding to the sampling voltage of the sampling resistor during the conduction time of the switching transistor to obtain the first-time signal. The second time acquisition module is connected to the logic control module and is used to acquire the conduction time of the switching transistor and convert the conduction time to obtain a second time signal. A time comparison module, connected to the first time acquisition module and the second time acquisition module, is used to obtain a shutdown time reference adjustment signal based on the first time signal and the second time signal; The logic control module is connected to the time comparison module and is used to update the turn-off time of the switching transistor according to the turn-off time reference adjustment signal, so as to regulate the working mode of the inductor current; the working mode of the inductor current corresponds to the turn-off time of the switching transistor.

[0006] In some embodiments, the first time acquisition module is used to acquire the sampling time from the change of the sampling voltage to the second reference voltage during the conduction time of the switching transistor and when the sampling voltage is greater than the first reference voltage, and to perform a signal conversion of the sampling time by a factor of n / (n-1) to obtain the first time signal; Wherein, the second reference voltage is n times the first reference voltage, and n is a positive number greater than 1.

[0007] In some embodiments, the first time acquisition module is used to acquire the sampling time from the change of the sampling voltage to the first reference voltage during the conduction time of the switching transistor and when the sampling voltage is less than the first reference voltage, and to perform a signal conversion of the sampling time by a factor of n to obtain the first time signal.

[0008] In some embodiments, the time comparison module is used to obtain the turn-off time reference adjustment signal when the first time signal is greater than the second time signal, so as to control the logic control module to extend the turn-off time of the switching transistor.

[0009] In some embodiments, the time comparison module is used to obtain the turn-off time reference adjustment signal when the first time signal and the second time signal are equal, so as to control the logic control module to shorten the turn-off time of the switching transistor.

[0010] In some embodiments, the first time acquisition module includes: A first comparison module, connected to the common connection terminal of the switching transistor and the sampling resistor, is used to output a first signal when the sampling voltage is greater than the first reference voltage, and to stop outputting the first signal when the sampling voltage is equal to the second reference voltage; wherein, the sampling time is the duration of the first signal. The first time conversion module is connected to the first comparison module and is used to perform a signal conversion of n / (n-1) times the duration of the first signal to obtain the first time signal.

[0011] In some embodiments, the circuit further includes: A first AND operation module, connected to the first comparison module and the second time acquisition module, is used to perform an AND operation on the first signal and the acquired signal of the second time acquisition module to obtain a first AND signal; wherein, the sampling time is the time during which the first AND signal exists; The first time conversion module is connected to the first AND operation module and is used to perform a signal conversion of n / (n-1) times on the duration of the first AND signal to obtain the first time signal.

[0012] This application provides an inductor current-mode control circuit applied to a light-emitting diode (LED) driving circuit. The LED driving circuit includes a switching transistor, a sampling resistor, and an inductor. A first terminal of the switching transistor is connected to the inductor, and a second terminal of the switching transistor is connected to the sampling resistor. The inductor current-mode control circuit includes: A logic control module is connected to the control terminal of the switching transistor and is used to control the switching transistor's on / off state. The third time acquisition module is connected to the common connection terminal of the switching transistor and the sampling resistor. It is used to perform multiplication and signal conversion on the change time corresponding to the sampling voltage of the sampling resistor during the conduction time of the switching transistor to obtain the third time signal. The second time acquisition module is connected to the logic control module and is used to acquire the conduction time of the switching transistor and convert the conduction time to obtain a second time signal. A time comparison module, connected to the third time acquisition module and the second time acquisition module, is used to obtain a shutdown time reference adjustment signal based on the third time signal and the second time signal; The logic control module is connected to the time comparison module and is used to update the turn-off time of the switching transistor according to the turn-off time reference adjustment signal, so as to regulate the working mode of the inductor current.

[0013] In some embodiments, the third time acquisition module is used to acquire the sampling time from when the switch is turned on to when the sampling voltage changes to the first reference voltage during the conduction time of the switch and when the sampling voltage is less than the first reference voltage, and to perform a signal conversion of n times on the sampling time to obtain the third time signal; Where n is a positive number greater than 1.

[0014] In some embodiments, the time comparison module is used to obtain the turn-off time reference adjustment signal when the third time signal is less than the second time signal, so as to control the logic control module to extend the turn-off time of the switching transistor.

[0015] In some embodiments, the time comparison module is used to obtain the turn-off time reference adjustment signal when the third time signal is equal to the second time signal, so as to control the logic control module to shorten the turn-off time of the switching transistor.

[0016] In some embodiments, the third time acquisition module includes: The second comparison module is connected to the common connection terminal of the switching transistor and the sampling resistor, and is used to output a second signal when the sampling voltage is less than the first reference voltage, and to stop outputting the second signal when the sampling voltage is equal to the first reference voltage; wherein, the sampling time is the time during which the second signal exists; The second time conversion module, connected to the second comparison module, is used to perform a signal conversion of n times the duration of the second signal to obtain the third time signal.

[0017] In some embodiments, the circuit further includes: The second AND operation module, connected to the second comparison module and the second time acquisition module, is used to perform an AND operation on the second signal and the acquired signal of the second time acquisition module to obtain a second AND signal; wherein, the sampling time is the time during which the second AND signal exists; The second time conversion module is connected to the second AND operation module and is used to perform a signal conversion of n times the duration of the second AND signal to obtain the third time signal.

[0018] In some embodiments, the logic control module includes: A shutdown control module, connected to the time comparison module, is used to update the shutdown time according to the shutdown time reference adjustment signal and generate a shutdown control signal. A logic module, connected to the shutdown control module, is used to output a shutdown drive signal according to the shutdown control signal; A drive module, connected to the logic module, is used to control the switching transistor to turn off according to the turn-off drive signal.

[0019] In some embodiments, the logic control module further includes: An automatic adjustment module, connected to the shutdown control module and the time comparison module, is used to adjust the signal according to the shutdown time reference, generate an adjustment signal, and send the adjustment signal to the shutdown control module to update the shutdown time.

[0020] In some embodiments, the circuit further includes: A conduction control module is connected to the common connection terminal of the switching transistor and the sampling resistor, and is used to acquire the sampling voltage and output a conduction control signal when the sampling voltage is less than the second reference voltage; The logic module is connected to the conduction control module and is used to output a conduction drive signal according to the conduction control signal; The driving module is connected to the logic module and is used to control the switching transistor to turn on according to the turn-on driving signal.

[0021] This application provides an inductor current-mode modulation method applied to a light-emitting diode (LED) driving circuit. The LED driving circuit includes a switching transistor, a sampling resistor, and an inductor. A first terminal of the switching transistor is connected to the inductor, and a second terminal of the switching transistor is connected to the sampling resistor. The method includes: During the conduction time of the switching transistor, the change time corresponding to the sampling voltage of the sampling resistor is multiplied and converted into a signal to obtain a first time signal; The on-time of the switching transistor is acquired, and the on-time is converted to obtain a second time signal; Based on the first time signal and the second time signal, the off-time reference adjustment signal is obtained; The turn-off time of the switching transistor is updated according to the turn-off time reference adjustment signal to regulate the operating mode of the inductor current.

[0022] In some embodiments, the step of performing a multiple conversion and signal conversion on the change time corresponding to the sampling voltage of the sampling resistor during the conduction time of the switching transistor to obtain a first time signal includes: During the conduction time of the switching transistor, and when the sampling voltage is greater than the first reference voltage, the sampling time from the change of the sampling voltage to the second reference voltage is collected, and the sampling time is converted by n / (n-1) times to obtain the first time signal; Wherein, the second reference voltage is n times the first reference voltage, and n is a positive number greater than 1.

[0023] In some embodiments, the step of obtaining the shutdown time reference adjustment signal based on the first time signal and the second time signal includes: When the first time signal is greater than the second time signal, the off-time reference adjustment signal is obtained to extend the off-time of the switching transistor.

[0024] In some embodiments, the step of obtaining the shutdown time reference adjustment signal based on the first time signal and the second time signal includes: When the first time signal and the second time signal are equal, the turn-off time reference adjustment signal is obtained to shorten the turn-off time of the switching transistor.

[0025] This application provides an inductor current-mode modulation method applied to a light-emitting diode (LED) driving circuit. The LED driving circuit includes a switching transistor, a sampling resistor, and an inductor. A first terminal of the switching transistor is connected to the inductor, and a second terminal of the switching transistor is connected to the sampling resistor. The method includes: During the conduction time of the switching transistor, the change time corresponding to the sampling voltage of the sampling resistor is multiplied and converted into a signal to obtain a third time signal; The on-time of the switching transistor is acquired, and the on-time is converted to obtain a second time signal; Based on the third time signal and the second time signal, a shutdown time reference adjustment signal is obtained; The turn-off time of the switching transistor is updated according to the turn-off time reference adjustment signal to regulate the operating mode of the inductor current.

[0026] In some embodiments, the step of performing a factor conversion and signal conversion on the change time corresponding to the sampling voltage of the sampling resistor during the conduction time of the switching transistor to obtain a third time signal includes: During the conduction time of the switching transistor, and when the sampling voltage is less than the first reference voltage, the sampling time from the change of the sampling voltage to the first reference voltage is collected, and the sampling time is converted by n times to obtain the third time signal; Where n is a positive number greater than 1.

[0027] In some embodiments, the step of obtaining the shutdown time reference adjustment signal based on the third time signal and the second time signal includes: When the third time signal is less than the second time signal, the off-time reference adjustment signal is obtained to extend the off-time of the switching transistor.

[0028] In some embodiments, the step of obtaining the shutdown time reference adjustment signal based on the third time signal and the second time signal includes: When the third time signal is equal to the second time signal, the turn-off time reference adjustment signal is obtained to shorten the turn-off time of the switching transistor.

[0029] This application provides a light-emitting diode driving device, including the inductor current mode control circuit described in any of the above embodiments.

[0030] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows: The logic control module controls the switching transistor's on and off states. During the transistor's on-time (which can also be understood as the Ton period), a constant voltage difference is applied across the inductor. Based on the inductor's volt-ampere characteristic, the inductor current increases linearly with the on-time. Subsequently, a sampling resistor is connected in series in the circuit, and current flows through it. The sampling voltage across the sampling resistor changes synchronously and linearly with the on-time.

[0031] Based on the time-voltage ratio, it can be determined that the time ratio equals the voltage ratio in both CRM and DCM operating modes. Therefore, when T1×n / (n-1) = Ton or T0×n = Ton, it indicates that the system is operating in either CRM or DCM mode, and the Toff time needs to be gradually reduced to adjust towards CCM mode. When T1×n / (n-1) is greater than Ton, it indicates that the system is operating in CCM mode, and the Toff time needs to be gradually increased. When T0×n is less than Ton, it indicates that the system is operating in CCM mode, and the Toff time needs to be gradually increased. This ultimately achieves dynamic switching between CCM and DCM operating modes.

[0032] Therefore, the change time corresponding to the sampling voltage of the sampling resistor can be understood as T0 and T1. During the conduction time of the switching transistor (which can also be understood as the Ton period), the first time acquisition module acquires the change time corresponding to the sampling voltage of the sampling resistor, and performs a multiplication and signal conversion on the change time to obtain the corresponding first time signal. Alternatively, the third time acquisition module acquires the change time corresponding to the sampling voltage of the sampling resistor, and performs a multiplication and signal conversion on the change time to obtain the corresponding third time signal. The first time signal can be understood as the signal corresponding to time T1×n / (n-1). The third time signal can be understood as the signal corresponding to time T0×n.

[0033] Simultaneously, by connecting the second time acquisition module to the logic control module, the on-time (Ton) of the switching transistor can be acquired in real time. This on-time is then converted to obtain the corresponding second time signal. The second time signal can be understood as the signal corresponding to time Ton. By comparing the first and second time signals using the time comparison module, the relationship between time T1×n / (n-1) and time Ton can be reflected. Alternatively, by comparing the third and second time signals using the time comparison module, the relationship between time T0×n and time Ton can be reflected. Therefore, based on the first and second time signals or the third and second time signals, the time comparison module can determine the turn-off time reference adjustment signal. This allows the logic control module to update the turn-off time of the switching transistor according to the turn-off time reference adjustment signal, either by reducing or increasing the Toff time. Reducing the Toff time allows for adjustment to switch to CCM operating mode. Increasing the Toff time allows for adjustment to switch to DCM operating mode.

[0034] Therefore, the inductor current mode control circuit provided in this application can achieve switching between different inductor current operating modes without directly detecting the inductor current, the parasitic capacitance across the inductor, or the switching transistor. It is not affected by the parasitic parameters of the switching transistor and is not limited by integrated circuit technology. The inductor current mode control circuit provided in this application achieves switching between different inductor current operating modes by detecting the sampling voltage of the sampling resistor to acquire the time. It can automatically and dynamically adjust the Toff time, achieving dynamic adjustment of the switching transistor's turn-off time. It does not require high-voltage detection and is convenient for current integration. Thus, the inductor current mode control circuit provided in this application can improve detection accuracy and accurately achieve switching between different inductor current operating modes, solving the problem of low detection accuracy in traditional technologies that prevents accurate switching between different inductor current operating modes. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A schematic diagram of the circuit structure for comparing T1×n / (n-1) with Ton using a multiplier and a comparator in some embodiments provided in this application; Figure 2Schematic diagrams of circuit structures using multipliers and comparators to compare T0×n and Ton in some embodiments provided in this application; Figure 3 Waveform diagrams of inductor current operating modes in some embodiments provided in this application; Figure 4 A schematic diagram of the circuit structure for comparing T1×n / (n-1) with Ton using the first AND operation module in some embodiments provided in this application; Figure 5 Schematic diagrams of circuit structures for comparing T0×n and Ton using a second AND operation module in some embodiments provided in this application; Figure 6 The connection structure diagram of the logic control module is provided in some embodiments of this application; Figure 7 Schematic diagram of the circuit structure for comparing T1×n / (n-1) with Ton using a multiplier and operational amplifier in some embodiments provided in this application; Figure 8 Schematic diagrams of the connection structure between the automatic control module and the second AND operation module in some embodiments provided in this application; Figure 9 A schematic diagram of the connection structure of the first current source, the first capacitor, and the first multiplier in some embodiments provided in this application; Figure 10 A schematic diagram of the circuit structure for comparing T1×n / (n-1) with Ton using a frequency-doubled clock or a multiplier current source and a comparator in some embodiments provided in this application; Figure 11 Schematic diagram of the circuit structure for comparing T1×n / (n-1) with Ton using a frequency multiplier clock or a multiplier current source and a first AND operation module in some embodiments provided in this application; Figure 12 A schematic diagram of the circuit structure of the second current source and the second capacitor in some embodiments provided in this application; Figure 13 The circuit structure diagrams of the first counter and the first clock generator provided in some embodiments of this application are shown below; Figure 14 A schematic diagram of the circuit structure of the first comparator in some embodiments provided in this application; Figure 15 The circuit structure diagram provided in some embodiments of this application shows the use of a multiplier and a second AND operation module to compare T0×n with Ton; Figure 16 Circuit diagrams of the third current source, third capacitor, and third multiplier provided in some embodiments of this application; Figure 17A schematic diagram of a circuit structure for comparing T0×n and Ton using a frequency-doubling clock or a multiplier current source and an operational amplifier in some embodiments provided in this application; Figure 18 A schematic diagram of the circuit structure of the fourth current source and the fourth capacitor in some embodiments provided in this application; Figure 19 Circuit diagrams of the second counter and the second clock generator provided in some embodiments of this application; Figure 20 The circuit structure diagram of the second comparator in some embodiments provided in this application; Figure 21 A schematic diagram of the circuit structure for comparing T1×n / (n-1) with Ton using a frequency multiplier clock or a multiplier current source and an operational amplifier in some embodiments provided in this application; Figure 22 A schematic diagram of the circuit structure of the fifth current source and the fifth capacitor in some embodiments provided in this application; Figure 23 A schematic diagram of the circuit structure for comparing T1×n / (n-1) with Ton using a frequency multiplier clock or a multiple current source, an operational amplifier, and a first AND operation module in some embodiments provided in this application; Figure 24 Circuit diagrams of the third counter and the third clock generator provided in some embodiments of this application; Figure 25 A schematic diagram of the circuit structure for comparing T0×n and Ton using a frequency multiplier clock or multiple current source, a comparator, and a second AND operation module in some embodiments provided in this application; Figure 26 A schematic diagram of the circuit structure of the fourth comparator in some embodiments provided in this application; Figure 27 The circuit structure diagram of the operational amplifier in some embodiments provided in this application; Figure 28 A schematic diagram of the circuit structure of the third comparator in some embodiments provided in this application; Figure 29 The following is a flowchart illustrating the steps of the inductor current mode control method in some embodiments provided in this application. Detailed Implementation

[0037] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0038] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0039] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. Additionally, in the embodiments of this application, the terms "first" and "second" are used to distinguish identical or similar items that have substantially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or order of execution, and that "first" and "second" do not necessarily imply difference.

[0041] In the description of this application, unless otherwise stated, " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B can mean A or B. "And / or" in this application is merely a description of the relationship between the related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone, where A and B can be singular or plural. Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0042] Please see Figure 1This application provides an inductor current-mode control circuit 100. The inductor current-mode control circuit 100 is applied to a light-emitting diode (LED) driving circuit 200. The LED driving circuit 200 includes a switching transistor 210, a sampling resistor 220, and an inductor 230. The first terminal of the switching transistor 210 is connected to the inductor 230, and the second terminal of the switching transistor 210 is connected to the sampling resistor 220.

[0043] The inductor current mode control circuit 100 includes a logic control module 110, a first time acquisition module 120, a second time acquisition module 130, and a time comparison module 140. The logic control module 110 is connected to the control terminal of the switching transistor 210 and is used to control the on / off state of the switching transistor 210.

[0044] The first time acquisition module 120 is connected to the common connection terminal of the switching transistor 210 and the sampling resistor 220. It is used to perform multiplication and signal conversion on the change time corresponding to the sampling voltage of the sampling resistor 220 during the conduction time of the switching transistor 210 to obtain a first time signal. The second time acquisition module 130 is connected to the logic control module 110. It is used to acquire the conduction time of the switching transistor 210 and convert the conduction time to obtain a second time signal. Alternatively, the inductor current mode control circuit 100 includes a third time acquisition module 180. The third time acquisition module 180 is connected to the common connection terminal of the switching transistor 210 and the sampling resistor 220. It is used to perform multiplication and signal conversion on the change time corresponding to the sampling voltage of the sampling resistor 220 during the conduction time of the switching transistor 210 to obtain a third time signal, such as... Figure 2 As shown.

[0045] The time comparison module 140 is connected to the first time acquisition module 120 and the second time acquisition module 130, and is used to obtain a shutdown time reference adjustment signal based on the first time signal and the second time signal. Alternatively, the time comparison module 140 is connected to the third time acquisition module 180 and the second time acquisition module 130, and is used to obtain a shutdown time reference adjustment signal based on the third time signal and the second time signal.

[0046] The logic control module 110 is connected to the time comparison module 140 and is used to update the turn-off time of the switching transistor 210 according to the turn-off time reference, so as to regulate the working mode of the inductor current.

[0047] In this embodiment, the logic control module 110 controls the switching transistor 210 to turn on and off. During the on-time of the switching transistor 210 (which can also be understood as the Ton period), a constant voltage difference is applied across the inductor 230. According to the inductor's volt-ampere characteristic, the inductor current increases linearly with the on-time. Furthermore, the sampling resistor 220 is connected in series in the circuit, and current flows through the sampling resistor 220. The sampling voltage of the sampling resistor 220 changes synchronously and linearly with the on-time.

[0048] Please see Figure 3 In the continuous conduction mode (CCM mode), the waveform corresponding to the Ton period (which can also be understood as the on-time of the switching transistor 210) represents the change of the sampling voltage formed by the inductor current flowing through the sampling resistor 220 over time, showing a gradually increasing trend. During the Toff period (which can also be understood as the off-time of the switching transistor 210), the inductor current does not flow through the sampling resistor 220, and no sampling voltage is formed. However, the inductor current gradually decreases over time. The dashed line here is a schematic waveform for easier understanding.

[0049] Similarly, in the critical conduction mode (i.e., CRM mode), the waveform corresponding to the Ton period (which can also be understood as the on-time of switch 210) represents the change of the sampling voltage formed by the inductor current flowing through the sampling resistor 220 over time, showing a gradually increasing trend. During the Toff period (which can also be understood as the off-time of switch 210), the inductor current does not flow through the sampling resistor 220, and no sampling voltage is formed. However, the inductor current gradually decreases over time. The dashed line here is a schematic waveform for easier understanding.

[0050] Similarly, in the intermittent conduction mode (DCM mode), the waveform corresponding to the Ton period (which can also be understood as the on-time of the switching transistor 210) represents the change of the sampling voltage formed by the inductor current flowing through the sampling resistor 220 over time, showing a gradually increasing trend. During the Toff period (which can also be understood as the off-time of the switching transistor 210), the inductor current does not flow through the sampling resistor 220, and no sampling voltage is formed. However, the inductor current gradually decreases over time. The dashed line here is a schematic waveform for easier understanding.

[0051] In continuous conduction mode (CCM mode), T Vref / n The voltage at time T0 is the first reference voltage Vref / n, and the voltage at time Ton is the second reference voltage Vref. The time from the first reference voltage Vref / n to the second reference voltage Vref is T1 = Ton - T. Vref / n The time from voltage 0 to the first reference voltage Vref / n is T0 = T Vref / nSince the inductor current does not start from 0, T1×n / (n-1) calculated based on T1 is greater than Ton. T0×n calculated based on T0 is less than Ton. Here, n is a positive number greater than 1.

[0052] In the critical conduction mode (i.e., CRM mode), since the inductor current starts from 0, T1×n / (n-1)=Ton is calculated based on T1. T0×n=Ton is calculated based on T0.

[0053] In discontinuous conduction mode (DCM mode), since the inductor current starts from 0, T1×n / (n-1)=Ton is calculated based on T1. T0×n=Ton is calculated based on T0.

[0054] Based on the time-voltage ratio, it can be determined that the time ratio equals the voltage ratio in both CRM and DCM operating modes. Therefore, when T1×n / (n-1) = Ton or T0×n = Ton, it indicates that the system is operating in either CRM or DCM mode, and the Toff time needs to be gradually reduced to adjust towards CCM mode. When T1×n / (n-1) is greater than Ton, it indicates that the system is operating in CCM mode, and the Toff time needs to be gradually increased. Similarly, when T0×n is less than Ton, it also indicates that the system is operating in CCM mode, and the Toff time needs to be gradually increased. This ultimately achieves dynamic switching between CCM and DCM operating modes.

[0055] Therefore, the change time corresponding to the sampling voltage of sampling resistor 220 can be understood as T0 and T1. During the conduction time of switch 210 (which can also be understood as the Ton period), the change time corresponding to the sampling voltage of sampling resistor 220 is acquired by the first time acquisition module 120, and the change time is multiplied and converted into a signal to obtain the corresponding first time signal. The first time signal can be understood as the signal corresponding to time T1×n / (n-1). The third time signal can be understood as the signal corresponding to time T0×n.

[0056] Simultaneously, the second time acquisition module 130, connected to the logic control module 110, can also acquire the on-time (Ton) of the switching transistor 210 in real time and convert it to obtain the corresponding second time signal. The second time signal can be understood as the signal corresponding to time Ton. The time comparison module 140 compares the first and second time signals to reflect the relationship between time T1×n / (n-1) and time Ton. Alternatively, the time comparison module 140 compares the third and second time signals to reflect the relationship between time T0×n and time Ton. Therefore, the time comparison module 140 can determine the turn-off time reference adjustment signal based on the first and second time signals or the third and second time signals, enabling the logic control module 110 to update the turn-off time of the switching transistor 210 according to the turn-off time reference adjustment signal, either by reducing or increasing the Toff time. Reducing the Toff time allows for adjustment to the CCM operating mode. Increasing the Toff time allows for adjustment to the DCM operating mode.

[0057] Therefore, the inductor current mode control circuit 100 provided in this application can achieve switching between different inductor current operating modes without directly detecting the inductor current, the parasitic capacitance across the inductor, or the switching transistor. It is not affected by the parasitic parameters of the switching transistor and is not limited by integrated circuit technology. The inductor current mode control circuit 100 provides the ability to switch between different inductor current operating modes by detecting the sampling voltage of the sampling resistor 220 to acquire the time. It can automatically and dynamically adjust the Toff time to dynamically adjust the turn-off time of the switching transistor 210, without requiring high-voltage detection and facilitating current integration. Thus, the inductor current mode control circuit 100 provided in this application can improve detection accuracy and accurately achieve switching between different inductor current operating modes, solving the problem of low detection accuracy in traditional technologies that prevents accurate switching between different inductor current operating modes.

[0058] In some embodiments, the first time acquisition module 120 is used to acquire the sampling time from the change of the sampling voltage to the second reference voltage Vref during the conduction time of the switching transistor 210 and when the sampling voltage is greater than the first reference voltage Vref / n, and to perform a signal conversion on the sampling time by a factor of n / (n-1) to obtain the first time signal. Here, the second reference voltage is n times the first reference voltage, and n is a positive number greater than 1.

[0059] In this embodiment, when the sampling voltage is greater than the first reference voltage Vref / n, the sampling time for the sampling voltage to change to the second reference voltage Vref can be understood as the sampling time corresponding to the change of the sampling voltage from the first reference voltage Vref / n to the second reference voltage Vref, that is, the time T1 from the first reference voltage Vref / n to the second reference voltage Vref is T1 = Ton - T. Vref / n The signal conversion of sampling time T1 by a factor of n / (n-1) can be understood as multiplying sampling time T1 by n / (n-1) and then converting it into a first time signal to match the comparison type of time comparison module 140. Furthermore, based on the first and second time signals, time comparison module 140 can determine the turn-off time reference adjustment signal, enabling logic control module 110 to update the turn-off time of switching transistor 210 according to the turn-off time reference adjustment signal, either reducing or increasing the Toff time, thus achieving dynamic switching between CCM and DCM.

[0060] Please see Figure 2 In some embodiments, the inductor current mode control circuit 100 further includes a third time acquisition module 180. The third time acquisition module 180 is connected to the common connection terminal of the switching transistor 210 and the sampling resistor 220, and is used to perform multiplication and signal conversion on the change time corresponding to the sampling voltage of the sampling resistor 220 during the conduction time of the switching transistor 210 to obtain a third time signal.

[0061] The third time acquisition module 180 is used to acquire the sampling time from the change of the sampling voltage from the turn-on of the switch 210 to the first reference voltage when the sampling voltage is less than the first reference voltage Vref / n, and to perform a signal conversion of the sampling time by a factor of n to obtain the third time signal.

[0062] In this embodiment, when the sampled voltage is less than the first reference voltage Vref / n during the on-time Ton of the switching transistor 210, the sampling time from the change of the sampled voltage to the first reference voltage Vref / n can be understood as the sampling time T0. Performing a signal conversion on the sampling time T0 by a factor of n can be understood as multiplying the sampling time T0 by n and then converting it into a third time signal to match the comparison type of the time comparison module 140. Furthermore, the time comparison module 140 can determine the turn-off time reference adjustment signal based on the third time signal and the second time signal, enabling the logic control module 110 to update the turn-off time of the switching transistor 210 according to the turn-off time reference adjustment signal, either reducing or increasing the Toff time, thereby achieving dynamic switching between CCM and DCM.

[0063] In some embodiments, the time comparison module 140 is used to obtain a turn-off time reference adjustment signal when the first time signal is greater than the second time signal, so as to control the logic control module 110 to extend the turn-off time of the switch 210.

[0064] In this embodiment, when the first time signal is greater than the second time signal, it indicates that T1×n / (n-1) is greater than Ton, and the inductor current is in CCM operating mode. The turn-off time reference adjustment signal output by the time comparison module 140 is sent to the logic control module 110 to gradually increase the Toff time, extend the turn-off time of the switch 210, and realize the dynamic switching from CCM operating mode to DCM operating mode.

[0065] In some embodiments, the time comparison module 140 is used to obtain a turn-off time reference adjustment signal when the third time signal is less than the second time signal, so as to control the logic control module 110 to extend the turn-off time of the switch 210.

[0066] In this embodiment, when the third time signal is less than the second time signal, it indicates that T0×n is less than Ton, and the inductor current is in CCM operating mode. The turn-off time reference adjustment signal output by the time comparison module 140 is sent to the logic control module 110 to gradually increase the Toff time, extend the turn-off time of the switch 210, and realize the dynamic switching from CCM operating mode to DCM operating mode.

[0067] In some embodiments, the time comparison module 140 is used to obtain a turn-off time reference adjustment signal when the first time signal is equal to the second time signal, so as to control the logic control module 110 to shorten the turn-off time of the switching transistor 210.

[0068] In this embodiment, when the first time signal and the second time signal are equal, it indicates that T1×n / (n-1) equals Ton, and the inductor current is in either the CRM or DCM operating mode. The turn-off time reference adjustment signal output by the time comparison module 140 is sent to the logic control module 110 to gradually reduce the Toff time, shorten the turn-off time of the switching transistor 210, and realize the dynamic switching from the CRM or DCM operating mode to the CCM operating mode.

[0069] In some embodiments, the time comparison module 140 is used to obtain a turn-off time reference adjustment signal when the third time signal is equal to the second time signal, so as to control the logic control module 110 to shorten the turn-off time of the switching transistor 210.

[0070] In this embodiment, when the third time signal is equal to the second time signal, it indicates that T0×n equals Ton, and the inductor current is in either CRM or DCM operating mode. The turn-off time reference adjustment signal output by the time comparison module 140 is sent to the logic control module 110 to gradually reduce the Toff time, shorten the turn-off time of the switching transistor 210, and realize the dynamic switching from CRM or DCM operating mode to CCM operating mode.

[0071] In some embodiments, the first time acquisition module 120 includes a first comparison module 121 and a first time conversion module 122, such as Figure 1 The first comparison module 121 is connected to the common connection terminal of the switching transistor 210 and the sampling resistor 220, and is used to output a first signal when the sampling voltage is greater than the first reference voltage Vref / n, and to stop outputting the first signal when the sampling voltage is equal to the second reference voltage Vref; wherein, the sampling time is the time during which the first signal exists.

[0072] The first time conversion module 122 is connected to the first comparison module 121 and is used to perform a signal conversion of n / (n-1) times the duration of the first signal to obtain the first time signal.

[0073] In this embodiment, the first comparison module 121 compares the sampled voltage with the first reference voltage Vref / n and outputs a first signal. The first signal characterizes the comparison result between the sampled voltage and the first reference voltage Vref / n. In some embodiments, the first signal is high, indicating that the sampled voltage is greater than the first reference voltage Vref / n. The high-level output stops when the sampled voltage is equal to the second reference voltage Vref. Furthermore, by acquiring the duration of the first signal being high, the sampling time when the sampled voltage is greater than the first reference voltage Vref / n can be determined, that is, the sampling time is the duration of the first signal.

[0074] The first time conversion module 122 multiplies the duration of the first signal (which can also be understood as the sampling time) by n / (n-1) to convert it into a first time signal. The first time signal can be voltage or data, to match the comparison type of the time comparison module 140, and can be set according to the actual application scenario.

[0075] In some embodiments, the third time acquisition module 180 includes a second comparison module 181 and a second time conversion module 182, such as Figure 2As shown. The second comparison module 181 is connected to the common connection terminal of the switching transistor 210 and the sampling resistor 220, and is used to output a second signal when the sampling voltage is less than the first reference voltage Vref / n, and to stop outputting the second signal when the sampling voltage is equal to the first reference voltage; wherein, the sampling time is the time during which the second signal exists.

[0076] The second time conversion module 182 is connected to the second comparison module 181 and is used to perform a signal conversion of n times the duration of the second signal to obtain the third time signal.

[0077] In this embodiment, the second comparison module 181 compares the sampled voltage with the first reference voltage Vref / n and outputs a second signal. The second signal characterizes the comparison result between the sampled voltage and the first reference voltage Vref / n. In some embodiments, the second signal is high, indicating that the sampled voltage is less than the first reference voltage Vref / n. The high-level output stops when the sampled voltage is equal to the first reference voltage. Furthermore, by acquiring the duration of the second signal being high, the sampling time when the sampled voltage is less than the first reference voltage Vref / n can be determined, that is, the sampling time is the duration of the second signal.

[0078] The second time conversion module 182 multiplies the duration of the second signal (which can also be understood as the sampling time) by n times to convert it into a third time signal. The third time signal can be voltage or data to match the comparison type of the time comparison module 140, and can be set according to the actual application scenario.

[0079] Please see Figure 4 In some embodiments, the inductor current mode control circuit 100 further includes a first AND operation module 160. The first AND operation module 160 is connected to the first comparison module 121 and the second time acquisition module 130, and is used to perform an AND operation on the first signal and the acquired signal of the second time acquisition module 130 to obtain a first AND signal. The sampling time is the duration of the first AND signal.

[0080] The first time conversion module 122 is connected to the first AND operation module 160 and is used to perform a signal conversion of n / (n-1) times the duration of the first AND signal to obtain the first time signal.

[0081] In this embodiment, the first signal output by the first comparison module 121 and the signal acquired by the second time acquisition module 130 are ANDed by the first AND operation module 160, which can solve the problem of the difference between the sampling voltage and the falling edge of Ton, obtain a more accurate first AND signal, and improve the time detection accuracy.

[0082] Then, the first time conversion module 122 multiplies the existence time of the first signal (which can also be understood as the sampling time) by n / (n-1) times and performs signal conversion to convert it into a first time signal. The first time signal can be voltage or data to match the comparison type of the time comparison module 140, which can be set according to the actual application scenario.

[0083] Please see Figure 5 In some embodiments, the inductor current mode control circuit 100 further includes a second AND operation module 170. The second AND operation module 170 is connected to the second comparison module 181 and the second time acquisition module 130, and is used to perform an AND operation on the second signal and the acquired signal from the second time acquisition module 130 to obtain a second AND signal. The sampling time is the duration of the second AND signal.

[0084] The second time conversion module 182 is connected to the second AND operation module 170 and is used to perform a signal conversion of n times the duration of the second AND signal to obtain the third time signal.

[0085] In this embodiment, the second signal output by the second comparison module 181 and the acquisition signal of the second time acquisition module 130 are ANDed by the second AND operation module 170, which can solve the problem of the difference between the sampling voltage and the falling edge of Ton, obtain a more accurate second AND signal, and improve the time detection accuracy.

[0086] Then, the second time conversion module 182 multiplies the duration of the second signal (which can also be understood as the sampling time) by n times to convert it into a third time signal. The third time signal can be voltage or data to match the comparison type of the time comparison module 140, and can be set according to the actual application scenario.

[0087] Please see Figure 6 In some embodiments, the logic control module 110 includes a shutdown control module 111, a logic module 112, and a drive module 113. The shutdown control module 111 is connected to the time comparison module 140 and is used to update the shutdown time according to the shutdown time reference adjustment signal and generate a shutdown control signal. The logic module 112 is connected to the shutdown control module 111 and is used to output a shutdown drive signal according to the shutdown control signal. The drive module 113 is connected to the logic module 112 and is used to control the switching transistor 210 to turn off according to the shutdown drive signal.

[0088] In this embodiment, when the on-time of the switch 210 ends (which can also be understood as the Ton period), the corresponding time comparison module 140 outputs a turn-off time reference adjustment signal, causing the turn-off control module 111 to increment (or increment by n) or decrement (or decrement by n) cycle by cycle to increase or decrease the Toff time, thereby updating the turn-off time. Alternatively, the turn-off time reference adjustment signal output by the time comparison module 140 can be understood as the turn-off control module 111 incrementing (or incrementing by n) or decrementing (or decrementing by n) the Toff time of the previous cycle, thereby increasing or decreasing the Toff time and updating the turn-off time for the current cycle.

[0089] In some embodiments, the shutdown control module 111 includes a capacitor, a current source, and a comparator, etc. Alternatively, the shutdown control module 111 includes a latch, a clock generator, a counter, and a comparator, etc. The components used in the shutdown control module 111 can be adjusted according to the actual application scenario. The shutdown time reference adjustment signal output by the time comparison module 140 can be used to add 1 (or add n) or subtract 1 (or subtract n) from the Toff time of the previous cycle, serving as the comparison reference for the comparator, thereby increasing or decreasing the Toff time to update the shutdown time of the current cycle.

[0090] In some embodiments, the logic module 112 includes elements such as flip-flops. The specific type of flip-flop can be set according to the actual application scenario, and this application does not impose specific limitations. The drive module 113 includes N-type and P-type switching transistors, which can realize voltage conversion and current enhancement, thereby generating a turn-off voltage signal according to the turn-off drive signal to control the switch 210 to turn off. The drive module 113 can also be understood as a gate driver, which can be adjusted and set according to the actual application scenario.

[0091] Please see Figure 7 and Figure 8 In some embodiments, the logic control module 110 further includes an automatic adjustment module 114. The automatic adjustment module 114 is connected to the shutdown control module 111 and the time comparison module 140, and is used to adjust the signal according to the shutdown time reference, generate an adjustment signal, and send the adjustment signal to the shutdown control module 111 to update the shutdown time.

[0092] In this embodiment, the automatic adjustment module 114 is connected to the time comparison module 140. It can obtain the comparison result between the first time signal and the second time signal (or the third time signal and the second time signal) based on the turn-off time reference adjustment signal, and then automatically generate an adjustment signal so that the turn-off control module 111 can increment by 1 (or increment by n) or decrement by 1 (or decrement by n) cycle by cycle to increase or decrease the Toff time, thereby updating the turn-off time.

[0093] In some embodiments, the automatic control module 114 includes a signal generator for sending a pulse signal (i.e., a control signal) to the shutdown control module 111 based on the comparison result of the first time signal and the second time signal (or the third time signal and the second time signal) (i.e., the shutdown time reference adjustment signal).

[0094] In some embodiments, the inductor current-mode regulation circuit 100 further includes a turn-on control module 150. The turn-on control module 150 is connected to the common connection terminal of the switching transistor 210 and the sampling resistor 220, and is used to acquire the sampling voltage and output a turn-on control signal when the sampling voltage is less than the second reference voltage Vref.

[0095] Logic module 112 is connected to conduction control module 150 and is used to output conduction drive signal according to conduction control signal. Drive module 113 is connected to logic module 112 and is used to control switch 210 to conduct according to conduction drive signal.

[0096] In this embodiment, the conduction control module 150 can be understood as the control module for the conduction time (or Ton period) of the switching transistor 210. The conduction control module 150 compares the sampled voltage with the second reference voltage Vref, and when the sampled voltage is less than the second reference voltage Vref, it outputs a conduction control signal and sends it to the logic module 112. This causes the logic module 112 to output a conduction drive signal, controlling the drive module 113 to drive the switching transistor 210 to conduct, entering the conduction time (or Ton period) of the switching transistor 210.

[0097] Please see Figure 9In some embodiments, the first time conversion module 122 includes a first current source 1221, a first capacitor 1222, and a first multiplier 1223. The enable terminal of the first current source 1221 is connected to the output terminal of the first comparison module 121. Alternatively, the enable terminal of the first current source 1221 is connected to the output terminal of the first AND operation module 160. The inflow terminal of the first current source 1221 is used to obtain the supply voltage; wherein, the current of the first current source 1221 is a single current. The first terminal of the first capacitor 1222 is connected to the outflow terminal of the first current source 1221, and the second terminal of the first capacitor 1222 is grounded. The input terminal of the first multiplier 1223 is connected to the outflow terminal of the first current source 1221, and the output terminal of the first multiplier 1223 is connected to the time comparison module 140.

[0098] In this embodiment, the enable terminal of the first current source 1221 is connected to the output terminal of the first comparison module 121. Alternatively, the enable terminal of the first current source 1221 is connected to the output terminal of the first AND operation module 160. The current from the first current source 1221 charges the first capacitor 1222; the longer the charging time, the higher the voltage generated on the first capacitor 1222. Consequently, the voltage V of the first capacitor 1222... T（Vref / n-Vref） This precisely represents the change in time T1, converting time T1 into voltage. The voltage V across the first capacitor 1222 is... T（Vref / n-Vref） After passing through the first multiplier 1223, the time T1×n / (n-1) can be converted into voltage.

[0099] Through the first current source 1221, the first capacitor 1222 and the first multiplier 1223, time can be converted into a first time signal that the circuit can process and sent to the time comparison module 140.

[0100] Please see Figure 10 , Figure 11 as well as Figure 12 In some embodiments, the first time conversion module 122 includes a second current source 1224 and a second capacitor 1225. The enable terminal of the second current source 1224 is connected to the output terminal of the first comparison module 121. Alternatively, the enable terminal of the second current source 1224 is connected to the output terminal of the first AND operation module 160. The inflow terminal of the second current source 1224 is used to obtain the supply voltage. The current of the second current source 1224 is n / (n-1) times that of the first current source 1221, where n is a positive number greater than 1. The first terminal of the second capacitor 1225 is connected to the outflow terminal of the second current source 1224 and the time comparison module 140, and the second terminal of the second capacitor 1225 is grounded.

[0101] In this embodiment, the enable terminal of the second current source 1224 is connected to the output terminal of the first comparison module 121. Alternatively, the enable terminal of the second current source 1224 is connected to the output terminal of the first AND operation module 160. The current of the second current source 1224 is n / (n-1) times that of the first current source 1221, i.e., n / (n-1)×i. Since the second current source 1224 has a multiplier relationship, no multiplier is needed in the circuit; the conversion can be achieved through the second current source 1224 and the second capacitor 1225.

[0102] The current n / (n-1)×i from the second current source 1224 charges the second capacitor 1225. The longer the charging time, the higher the voltage generated across the second capacitor 1225. Consequently, the voltage n / (n-1)×V across the second capacitor 1225 increases. T（Vref / n-Vref） It accurately represents the change in time T1×n / (n-1), converts the time T1×n / (n-1) into a voltage signal, that is, obtains the first time signal, and sends it to the time comparison module 140.

[0103] The current through the second current source 1224 is n / (n-1) times that of the first current source 1221, which can save the first multiplier 1223 and reduce the number of devices.

[0104] Please see Figure 13 In some embodiments, the first time conversion module 122 includes a first counter 1226 and a first clock generator 1227. The enable terminal of the first counter 1226 is connected to the output terminal of the first comparison module 121. Alternatively, the enable terminal of the first counter 1226 is connected to the output terminal of the first AND operation module 160. The output terminal of the first counter 1226 is connected to the time comparison module 140. The output terminal of the first clock generator 1227 is connected to the clock input terminal of the first counter 1226; wherein the frequency of the first clock generator 1227 is fs×(n-1) / n, where n is a positive number greater than 1.

[0105] In this embodiment, the enable terminal of the first counter 1226 is connected to the output terminal of the first comparison module 121, such as... Figure 13 The CMP_out node is in the middle. The frequency of the first clock generator 1227 is fs×(n-1) / n, which is set with a multiple relationship, so there is no need to set a multiplier on the circuit. The conversion can be achieved by the first counter 1226 and the first clock generator 1227.

[0106] The first clock generator 1227, which multiplies the frequency by fs×(n-1) / n, and the first counter 1226 can acquire the time T1×n / (n-1) and convert the time T1×n / (n-1) into data, which can also be understood as the multi-bit parallel binary data output by the first counter 1226, that is, to obtain the first time signal and send it to the time comparison module 140.

[0107] By setting the frequency of the first clock generator 1227 to fs×(n-1) / n, multipliers can be saved, reducing the number of devices.

[0108] Please see Figure 14 In some embodiments, the first comparison module 121 includes a first comparator 1211. The non-inverting input of the first comparator 1211 is connected to the common connection terminal of the switching transistor 210 and the sampling resistor 220, the inverting input of the first comparator 1211 is used to obtain the first reference voltage Vref / n, and the output of the first comparator 1211 is used to output a first signal.

[0109] In this embodiment, the first comparator 1211 compares the sampled voltage with the first reference voltage Vref / n and outputs a first signal. The first signal characterizes the comparison result between the sampled voltage and the first reference voltage Vref / n. In some embodiments, the first signal is high, indicating that the sampled voltage is greater than the first reference voltage Vref / n. The high-level output stops when the sampled voltage is equal to the second reference voltage Vref.

[0110] Please see Figure 15 and Figure 16 In some embodiments, the second time conversion module 182 includes a third current source 1821, a third capacitor 1822, and a third multiplier 1823. The enable terminal of the third current source 1821 is connected to the output terminal of the second comparison module 181. Alternatively, the enable terminal of the third current source 1821 is connected to the output terminal of the second AND operation module 170. The inflow terminal of the third current source 1821 is used to obtain the supply voltage. The first terminal of the third capacitor 1822 is connected to the outflow terminal of the third current source 1821, and the second terminal of the third capacitor 1822 is grounded. The input terminal of the third multiplier 1823 is connected to the outflow terminal of the third current source 1821, and the output terminal of the third multiplier 1823 is connected to the time comparison module 140.

[0111] In this embodiment, the enable terminal of the third current source 1821 is connected to the output terminal of the second comparison module 181. Alternatively, the enable terminal of the third current source 1821 is connected to the output terminal of the second AND operation module 170. The current from the third current source 1821 charges the third capacitor 1822; the longer the charging time, the higher the voltage generated on the third capacitor 1822. Consequently, the voltage V of the third capacitor 1822... T0This precisely represents the change in time T0, converting time T0 into voltage. The voltage V across the third capacitor 1822... T0 The third multiplier 1823 can convert time T0×n into voltage.

[0112] Through the third current source 1821, the third capacitor 1822 and the third multiplier 1823, time can be converted into a third time signal that the circuit can process and sent to the time comparison module 140.

[0113] Please see Figure 17 and Figure 18 In some embodiments, the second time conversion module 182 includes a fourth current source 1824 and a fourth capacitor 1825. The enable terminal of the fourth current source 1824 is connected to the output terminal of the second comparison module 181. Alternatively, the enable terminal of the fourth current source 1824 is connected to the output terminal of the second AND operation module 170. The inflow terminal of the fourth current source 1824 is used to obtain the supply voltage. The current of the fourth current source 1824 is n times that of the third current source 1821, where n is a positive number greater than 1. The first terminal of the fourth capacitor 1825 is connected to the outflow terminal of the fourth current source 1824 and the time comparison module 140, and the second terminal of the fourth capacitor 1825 is grounded.

[0114] In this embodiment, the enable terminal of the fourth current source 1824 is connected to the output terminal of the second comparison module 181. Alternatively, the enable terminal of the fourth current source 1824 is connected to the output terminal of the second AND operation module 170. The current of the fourth current source 1824 is n times that of the third current source 1821, i.e., n×i. Because the fourth current source 1824 has a multiplier relationship, no multiplier is needed in the circuit; the conversion can be achieved through the fourth current source 1824 and the fourth capacitor 1825.

[0115] The current n×i from the fourth current source 1824 charges the fourth capacitor 1825. The longer the charging time, the higher the voltage generated across the fourth capacitor 1825. Consequently, the voltage n×V across the fourth capacitor 1825... T0 It accurately represents the changes in time T0×n, converts the time T0×n into a voltage signal, that is, obtains the third time signal, and sends it to the time comparison module 140.

[0116] The current from the fourth current source 1824 is n times that of the third current source 1821, which can save the third multiplier 1823 and reduce the number of devices.

[0117] Please see Figure 19In some embodiments, the second time conversion module 182 includes a second counter 1826 and a second clock generator 1827. The enable terminal of the second counter 1826 is connected to the output terminal of the second comparison module 181. Alternatively, the enable terminal of the second counter 1826 is connected to the output terminal of the second AND operation module 170. The output terminal of the second counter 1826 is connected to the time comparison module 140. The output terminal of the second clock generator 1827 is connected to the clock input terminal of the second counter 1826.

[0118] In this embodiment, the enable terminal of the second counter 1826 is connected to the output terminal of the first comparison module 121. Alternatively, the enable terminal of the second counter 1826 is connected to the output terminal of the second AND operation module 170. The frequency of the second clock generator 1827 is fs×n, which has a multiplicative relationship, so there is no need to set up a multiplier in the circuit; the conversion can be achieved through the second counter 1826 and the second clock generator 1827.

[0119] The second clock generator 1827 and the second counter 1826, which are multiplied by fs×n, can collect the time T0×n and convert the time T0×n into data. This can also be understood as the multi-bit parallel binary data output by the second counter 1826, which is used to obtain the third time signal and send it to the time comparison module 140.

[0120] By setting the frequency of the second clock generator 1827 to fs×n, multipliers can be saved, reducing the number of devices.

[0121] Please see Figure 20 In some embodiments, the second comparison module 181 includes a second comparator 1811. The inverting input of the second comparator 1811 is connected to the common connection terminal of the switching transistor 210 and the sampling resistor 220, the non-inverting input of the second comparator 1811 is used to obtain a first reference voltage, and the output of the second comparator 1811 is used to output a second signal.

[0122] In this embodiment, the second comparator 1811 compares the sampled voltage with the first reference voltage Vref / n and outputs a second signal. The second signal characterizes the comparison result between the sampled voltage and the first reference voltage Vref / n. In some embodiments, the second signal is high, indicating that the sampled voltage is less than the first reference voltage Vref / n. The high-level output stops when the sampled voltage is equal to the second reference voltage Vref.

[0123] Please see Figure 21 and Figure 22In some embodiments, the second time acquisition module 130 includes a fifth current source 131 and a fifth capacitor 132. The enable terminal of the fifth current source 131 is connected to the output terminal of the logic module 112, and the inflow terminal of the fifth current source 131 is used to acquire the supply voltage. The current of the fifth current source 131 is a single current. The first terminal of the fifth capacitor 132 is connected to the outflow terminal of the fifth current source 131 and the time comparison module 140, and the second terminal of the fifth capacitor 132 is grounded.

[0124] In this embodiment, the enable terminal of the fifth current source 131 is connected to the output terminal of the logic module 112. The current from the fifth current source 131 charges the fifth capacitor 132; the longer the charging time, the higher the voltage generated on the fifth capacitor 132. Consequently, the voltage V of the fifth capacitor 132... Ton It accurately represents the changes in Ton time, converting Ton time into voltage.

[0125] The fifth current source 131 and the fifth capacitor 132 can convert time into a second time signal that the circuit can process, and send it into the time comparison module 140.

[0126] Please see Figure 23 and Figure 24 In some embodiments, the second time acquisition module 130 includes a third counter 133 and a third clock generator 134. The enable terminal of the third counter 133 is connected to the output terminal of the logic module 112, and the output terminal of the third counter 133 is connected to the time comparison module 140. The output terminal of the third clock generator 134 is connected to the clock input terminal of the third counter 133; wherein, the frequency of the third clock generator 134 is a single frequency.

[0127] In this embodiment, the enable terminal of the third counter 133 is connected to the output terminal of the logic module 112. The frequency of the third clock generator 134 is fs. The third clock generator 134 with a frequency of fs and the third counter 133 can acquire the time of Ton and convert the time of Ton into data, which can also be understood as the multi-bit parallel binary data output by the third counter 133, that is, to obtain the second time signal, which is sent to the time comparison module 140.

[0128] Please see Figure 23 , Figure 25 as well as Figure 26 In some embodiments, the time comparison module 140 includes a fourth comparator 141, such as Figure 26 As shown. The non-inverting input of the fourth comparator 141 is connected to the first time conversion module 122 in the first time acquisition module 120, as follows. Figure 23As shown. Alternatively, the non-inverting input of the fourth comparator 141 is connected to the second time conversion module 182 in the third time acquisition module 180, as shown. Figure 25 As shown. The inverting input of the fourth comparator 141 is connected to the second time acquisition module 130, and the output of the fourth comparator 141 is connected to the logic control module 110.

[0129] In this embodiment, the non-inverting input of the fourth comparator 141 is connected to the first time acquisition module 120 to obtain a first time signal. Alternatively, the non-inverting input of the fourth comparator 141 is connected to the second time conversion module 182 to obtain a third time signal. The inverting input of the fourth comparator 141 is connected to the second time acquisition module 130 to obtain a second time signal.

[0130] The fourth comparator 141 compares the third time signal with the second time signal, and its output reflects the relationship between time T0×n and time Ton. Alternatively, the fourth comparator 141 compares the first time signal with the second time signal, and its output reflects the relationship between time T1×n / (n-1) and time Ton. Therefore, based on the first and second time signals (or the third and second time signals), the fourth comparator 141 can determine the turn-off time reference adjustment signal, enabling the logic control module 110 to update the turn-off time of the switching transistor 210 according to the turn-off time reference adjustment signal, either by reducing or increasing the Toff time. By reducing the Toff time, the Toff can be adjusted to switch to CCM operating mode. By increasing the Toff time, the Toff can be adjusted to switch to DCM operating mode.

[0131] Please see Figure 27 In some embodiments, the time comparison module 140 includes an operational amplifier 142. The non-inverting input of the operational amplifier 142 is connected to the first time conversion module 122 in the first time acquisition module 120. Alternatively, the non-inverting input of the operational amplifier 142 is connected to the second time conversion module 182 in the third time acquisition module 180. The inverting input of the operational amplifier 142 is connected to the second time acquisition module 130, and the output of the operational amplifier 142 is connected to the logic control module 110, such as... Figure 8 and Figure 15 As shown.

[0132] In this embodiment, the non-inverting input of operational amplifier 142 is connected to the first time conversion module 122 in the first time acquisition module 120 to acquire a first time signal. Alternatively, the non-inverting input of operational amplifier 142 is connected to the second time conversion module 182 in the third time acquisition module 180 to acquire a third time signal. The inverting input of operational amplifier 142 is connected to the second time acquisition module 130 to acquire a second time signal. When the first time signal is equal to the second time signal (or the third time signal is equal to the second time signal), the output of operational amplifier 142 may have an intermediate voltage. Therefore, an automatic adjustment module 114 is introduced. Operational amplifier 142 and automatic adjustment module 114 can be used together. The automatic control module 114 is connected to the operational amplifier 142 and can obtain the comparison result of the first time signal and the second time signal (or the comparison result of the third time signal and the second time signal). It can then automatically generate a control signal so that the shutdown control module 111 increments by 1 (or increments by n) or decrements by 1 (or decrements by n) cycle by cycle to increase or decrease the Toff time and update the shutdown time.

[0133] Please see Figure 28 In some embodiments, the conduction control module 150 includes a third comparator 151. The non-inverting input of the third comparator 151 is connected to the common connection terminal of the switching transistor 210 and the sampling resistor 220, the inverting input of the third comparator 151 is used to obtain the second reference voltage Vref, and the output of the third comparator 151 is connected to the logic module 112.

[0134] In this embodiment, the third comparator 151 compares the sampled voltage with the second reference voltage Vref and outputs a turn-on control signal. The turn-on control signal characterizes the comparison result between the sampled voltage and the second reference voltage Vref. The third comparator 151 sends the turn-on control signal to the logic module 112, causing the logic module 112 to output a turn-on drive signal, controlling the drive module 113 to drive the switch 210 to turn on, entering the turn-on time (which can also be understood as the Ton period) of the switch 210.

[0135] Please see Figure 29 This application provides an inductor current mode control method applied to a light-emitting diode (LED) driving circuit 200. The LED driving circuit 200 includes a switching transistor 210, a sampling resistor 220, and an inductor 230. The first terminal of the switching transistor 210 is connected to the inductor 230, and the second terminal of the switching transistor 210 is connected to the sampling resistor 220. The method includes: Step S10: During the conduction time of the switching transistor 210, the change time corresponding to the sampling voltage of the sampling resistor 220 is multiplied and converted into a signal to obtain the first time signal; Alternatively, during the conduction time of the switching transistor 210, the change time corresponding to the sampling voltage of the sampling resistor 220 is multiplied and converted into a signal to obtain a third time signal. Step S20: Acquire the conduction time of the switch transistor 210 and convert the conduction time to obtain a second time signal; Step S30: Obtain the off-time reference adjustment signal based on the first time signal and the second time signal; Alternatively, the off-time reference adjustment signal can be obtained based on the third time signal and the second time signal; In step S40, the turn-off time of the switching transistor 210 is updated according to the turn-off time reference adjustment signal to regulate the operating mode of the inductor current.

[0136] In this embodiment, the descriptions of steps S10, S20, S30, and S40 can be found in the descriptions in the above embodiments.

[0137] In some embodiments, step S10, which involves performing a multiple conversion and signal conversion on the change time corresponding to the sampling voltage of the sampling resistor 220 during the conduction time of the switching transistor 210 to obtain a first time signal, includes: Step S110: During the conduction time of the switching transistor 210 and when the sampling voltage is greater than the first reference voltage, the sampling time from the change of the sampling voltage to the second reference voltage is collected, and the sampling time is converted into a signal of n / (n-1) times to obtain the first time signal; The second reference voltage is n times the first reference voltage, where n is a positive number greater than 1.

[0138] In this embodiment, the relevant description of step S110 can be referred to the relevant description of the first time acquisition module 120 in the above embodiment.

[0139] In some embodiments, step S10, which involves performing a multiple conversion and signal conversion on the change time corresponding to the sampling voltage of the sampling resistor 220 during the conduction time of the switching transistor 210 to obtain a third time signal, includes: Step S120: During the conduction time of the switch 210 and when the sampling voltage is less than the first reference voltage, the sampling time from the change of the sampling voltage when the switch 210 is turned on to the first reference voltage is collected, and the sampling time is converted by n times to obtain the third time signal. Where n is a positive number greater than 1.

[0140] In this embodiment, the relevant description of step S120 can be found in the relevant description of the third time acquisition module 180 in the above embodiment.

[0141] In some embodiments, step S30, the step of obtaining the turn-off time reference adjustment signal based on the first time signal and the second time signal, includes: In step S310, when the first time signal is greater than the second time signal, a turn-off time reference adjustment signal is obtained to extend the turn-off time of the switch 210.

[0142] In this embodiment, the description of step S310 can be found in the description of the time comparison module 140 in the above embodiment.

[0143] In some embodiments, step S30, the step of obtaining the turn-off time reference adjustment signal based on the third time signal and the second time signal, includes: In step S320, when the third time signal is less than the second time signal, a turn-off time reference adjustment signal is obtained to extend the turn-off time of the switch 210.

[0144] In this embodiment, the description of step S320 can be found in the description of the time comparison module 140 in the above embodiment.

[0145] In some embodiments, step S30, the step of obtaining the turn-off time reference adjustment signal based on the first time signal and the second time signal, includes: In step S330, when the first time signal and the second time signal are equal, a turn-off time reference adjustment signal is obtained to shorten the turn-off time of the switch 210.

[0146] In this embodiment, the description of step S330 can be found in the description of the time comparison module 140 in the above embodiment.

[0147] In some embodiments, step S30, the step of obtaining the turn-off time reference adjustment signal based on the third time signal and the second time signal, includes: In step S340, when the third time signal is equal to the second time signal, a turn-off time reference adjustment signal is obtained to shorten the turn-off time of the switch 210.

[0148] In this embodiment, the description of step S340 can be found in the description of the time comparison module 140 in the above embodiment.

[0149] This application provides a light-emitting diode driving device, including the inductor current mode control circuit in any of the above embodiments.

[0150] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0151] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0152] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0153] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0154] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0155] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0156] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. An inductor current-mode control circuit, characterized in that, An LED driving circuit (200) is applied, comprising a switching transistor (210), a sampling resistor (220), and an inductor (230). The first terminal of the switching transistor (210) is connected to the inductor (230), and the second terminal of the switching transistor (210) is connected to the sampling resistor (220). The inductor current mode control circuit includes: A logic control module (110) is connected to the control terminal of the switching transistor (210) and is used to control the switching transistor (210) on and off. The first time acquisition module (120) is connected to the common connection terminal of the switch (210) and the sampling resistor (220), and is used to perform multiplication and signal conversion on the change time corresponding to the sampling voltage of the sampling resistor (220) during the conduction time of the switch (210) to obtain the first time signal; The second time acquisition module (130) is connected to the logic control module (110) and is used to acquire the conduction time of the switch (210) and convert the conduction time to obtain a second time signal; The time comparison module (140) is connected to the first time acquisition module (120) and the second time acquisition module (130) and is used to obtain the shutdown time reference adjustment signal based on the first time signal and the second time signal; The logic control module (110) is connected to the time comparison module (140) and is used to update the turn-off time of the switch (210) according to the turn-off time reference adjustment signal, so as to regulate the working mode of the inductor current.

2. The inductor current-mode control circuit as described in claim 1, characterized in that, The first time acquisition module (120) is used to acquire the sampling time from the change of the sampling voltage to the second reference voltage during the conduction time of the switch (210) and when the sampling voltage is greater than the first reference voltage, and to perform a signal conversion of the sampling time by n / (n-1) times to obtain the first time signal; Wherein, the second reference voltage is n times the first reference voltage, and n is a positive number greater than 1.

3. The inductor current-mode control circuit as described in claim 1, characterized in that, The time comparison module (140) is used to obtain a turn-off time reference adjustment signal when the first time signal is greater than the second time signal, so as to control the logic control module (110) to extend the turn-off time of the switch (210).

4. The inductor current-mode control circuit as described in claim 1, characterized in that, The time comparison module (140) is used to obtain the turn-off time reference adjustment signal when the first time signal and the second time signal are equal, so as to control the logic control module (110) to shorten the turn-off time of the switch (210).

5. The inductor current-mode control circuit as described in claim 2, characterized in that, The first time acquisition module (120) includes: The first comparison module (121) is connected to the common connection terminal of the switching transistor (210) and the sampling resistor (220), and is used to output a first signal when the sampling voltage is greater than the first reference voltage, and to stop outputting the first signal when the sampling voltage is equal to the second reference voltage; wherein, the sampling time is the time during which the first signal exists; The first time conversion module (122) is connected to the first comparison module (121) and is used to perform a signal conversion of n / (n-1) times the duration of the first signal to obtain the first time signal.

6. The inductor current-mode control circuit as described in claim 5, characterized in that, The circuit also includes: The first AND operation module (160) is connected to the first comparison module (121) and the second time acquisition module (130), and is used to perform an AND operation on the first signal and the acquired signal of the second time acquisition module (130) to obtain a first AND signal; wherein, the sampling time is the time during which the first AND signal exists; The first time conversion module (122) is connected to the first AND operation module (160) and is used to perform a signal conversion of n / (n-1) times the duration of the first AND signal to obtain the first time signal.

7. An inductor current-mode control circuit, characterized in that, An LED driving circuit (200) is applied, comprising a switching transistor (210), a sampling resistor (220), and an inductor (230). The first terminal of the switching transistor (210) is connected to the inductor (230), and the second terminal of the switching transistor (210) is connected to the sampling resistor (220). The inductor current mode control circuit includes: A logic control module (110) is connected to the control terminal of the switching transistor (210) and is used to control the switching transistor (210) on and off. The third time acquisition module (180) is connected to the common connection terminal of the switch (210) and the sampling resistor (220), and is used to perform multiplication and signal conversion on the change time corresponding to the sampling voltage of the sampling resistor (220) during the conduction time of the switch (210) to obtain the third time signal; The second time acquisition module (130) is connected to the logic control module (110) and is used to acquire the conduction time of the switch (210) and convert the conduction time to obtain a second time signal; The time comparison module (140) is connected to the third time acquisition module (180) and the second time acquisition module (130) and is used to obtain the shutdown time reference adjustment signal based on the third time signal and the second time signal; The logic control module (110) is connected to the time comparison module (140) and is used to update the turn-off time of the switch (210) according to the turn-off time reference adjustment signal, so as to regulate the working mode of the inductor current.

8. The inductor current-mode control circuit as described in claim 7, characterized in that, The third time acquisition module (180) is used to acquire the sampling time from when the switch (210) is turned on to when the sampling voltage changes to the first reference voltage, and when the sampling voltage is less than the first reference voltage, during the conduction time of the switch (210), and to perform a signal conversion of n times on the sampling time to obtain the third time signal; Where n is a positive number greater than 1.

9. The inductor current-mode control circuit as described in claim 7, characterized in that, The time comparison module (140) is used to obtain the turn-off time reference adjustment signal when the third time signal is less than the second time signal, so as to control the logic control module (110) to extend the turn-off time of the switch (210).

10. The inductor current-mode control circuit as described in claim 7, characterized in that, The time comparison module (140) is used to obtain the turn-off time reference adjustment signal when the third time signal is equal to the second time signal, so as to control the logic control module (110) to shorten the turn-off time of the switch (210).

11. The inductor current-mode control circuit as described in claim 8, characterized in that, The third time acquisition module (180) includes: The second comparison module (181) is connected to the common connection terminal of the switching transistor (210) and the sampling resistor (220), and is used to output a second signal when the sampling voltage is less than the first reference voltage, and to stop outputting the second signal when the sampling voltage is equal to the first reference voltage; wherein, the sampling time is the time during which the second signal exists; The second time conversion module (182) is connected to the second comparison module (181) and is used to perform a signal conversion of n times the duration of the second signal to obtain the third time signal.

12. The inductor current-mode control circuit as described in claim 11, characterized in that, The circuit also includes: The second AND operation module (170) is connected to the second comparison module (181) and the second time acquisition module (130), and is used to perform an AND operation on the second signal and the acquisition signal of the second time acquisition module (130) to obtain a second AND signal; wherein, the sampling time is the time during which the second AND signal exists; The second time conversion module (182) is connected to the second AND operation module (170) and is used to perform n times signal conversion on the existence time of the second AND signal to obtain the third time signal.

13. The inductor current-mode control circuit as described in claim 1 or claim 7, characterized in that, The logic control module (110) includes: The shutdown control module (111) is connected to the time comparison module (140) and is used to update the shutdown time according to the shutdown time reference adjustment signal and generate a shutdown control signal. The logic module (112) is connected to the shutdown control module (111) and is used to output a shutdown drive signal according to the shutdown control signal; The drive module (113) is connected to the logic module (112) and is used to control the switch (210) to turn off according to the turn-off drive signal.

14. The inductor current-mode control circuit as described in claim 13, characterized in that, The logic control module (110) further includes: An automatic adjustment module (114) is connected to the shutdown control module (111) and the time comparison module (140) and is used to adjust the signal according to the shutdown time reference, generate an adjustment signal, and send the adjustment signal to the shutdown control module (111) to update the shutdown time.

15. The inductor current-mode control circuit as described in claim 13, characterized in that, The circuit also includes: The conduction control module (150) is connected to the common connection terminal of the switching transistor (210) and the sampling resistor (220) to obtain the sampling voltage and output a conduction control signal when the sampling voltage is less than the second reference voltage. The logic module (112) is connected to the conduction control module (150) and is used to output a conduction drive signal according to the conduction control signal; The driving module (113) is connected to the logic module (112) and is used to control the switching transistor (210) to be turned on according to the turn-on driving signal.

16. A method for controlling inductor current mode, characterized in that, The method is applied to a light-emitting diode (LED) driving circuit (200), which includes a switching transistor (210), a sampling resistor (220), and an inductor (230). A first terminal of the switching transistor (210) is connected to the inductor (230), and a second terminal of the switching transistor (210) is connected to the sampling resistor (220). The method includes: During the conduction time of the switching transistor (210), the change time corresponding to the sampling voltage of the sampling resistor (220) is multiplied and converted into a signal to obtain a first time signal; The on-time of the switch (210) is collected and converted to obtain a second time signal; Based on the first time signal and the second time signal, the off-time reference adjustment signal is obtained; The turn-off time of the switch (210) is updated according to the turn-off time reference adjustment signal to regulate the working mode of the inductor current.

17. The inductor current mode control method as described in claim 16, characterized in that, The step of performing a multiple conversion and signal conversion on the change time corresponding to the sampling voltage of the sampling resistor (220) during the conduction time of the switching transistor (210) to obtain a first time signal includes: During the conduction time of the switch (210) and when the sampling voltage is greater than the first reference voltage, the sampling time from the change of the sampling voltage to the second reference voltage is collected, and the sampling time is converted by n / (n-1) times to obtain the first time signal; Wherein, the second reference voltage is n times the first reference voltage, and n is a positive number greater than 1.

18. The inductor current mode control method as described in claim 16, characterized in that, The step of obtaining the shutdown time reference adjustment signal based on the first time signal and the second time signal includes: When the first time signal is greater than the second time signal, the off-time reference adjustment signal is obtained to extend the off-time of the switch (210).

19. The inductor current mode control method as described in claim 16, characterized in that, The step of obtaining the shutdown time reference adjustment signal based on the first time signal and the second time signal includes: When the first time signal is equal to the second time signal, the off-time reference adjustment signal is obtained to shorten the off-time of the switch (210).

20. A method for controlling inductor current mode, characterized in that, The method is applied to a light-emitting diode (LED) driving circuit (200), which includes a switching transistor (210), a sampling resistor (220), and an inductor (230). A first terminal of the switching transistor (210) is connected to the inductor (230), and a second terminal of the switching transistor (210) is connected to the sampling resistor (220). The method includes: During the conduction time of the switching transistor (210), the change time corresponding to the sampling voltage of the sampling resistor (220) is multiplied and converted into a signal to obtain a third time signal; The on-time of the switch (210) is collected and converted to obtain a second time signal; Based on the third time signal and the second time signal, a shutdown time reference adjustment signal is obtained; The turn-off time of the switch (210) is updated according to the turn-off time reference adjustment signal to regulate the working mode of the inductor current.

21. The inductor current mode control method as described in claim 20, characterized in that, The step of performing a multiple conversion and signal conversion on the change time corresponding to the sampling voltage of the sampling resistor (220) during the conduction time of the switching transistor (210) to obtain a third time signal includes: During the conduction time of the switch (210) and when the sampling voltage is less than the first reference voltage, the sampling time from when the switch (210) is turned on to when the sampling voltage changes to the first reference voltage is collected, and the sampling time is converted by n times to obtain the third time signal; Where n is a positive number greater than 1.

22. The inductor current mode control method as described in claim 20, characterized in that, The step of obtaining the shutdown time reference adjustment signal based on the third time signal and the second time signal includes: When the third time signal is less than the second time signal, the off-time reference adjustment signal is obtained to extend the off-time of the switch (210).

23. The inductor current mode control method as described in claim 20, characterized in that, The step of obtaining the shutdown time reference adjustment signal based on the third time signal and the second time signal includes: When the third time signal is equal to the second time signal, the off-time reference adjustment signal is obtained to shorten the off-time of the switch (210).

24. A light-emitting diode driving device, characterized in that, Includes the inductor current mode control circuit as described in any one of claims 1 to 15.

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