Soft start control circuit, method, and apparatus for lamp module, and power assist lamp

Abstract

The present application discloses a soft start control circuit, method, and apparatus for a lamp module, and a power assist lamp. The soft start control circuit comprises: a switch transistor drive circuit; a switch transistor circuit, comprising at least one switch transistor, an input end of the switch transistor circuit being connected to the switch transistor drive circuit, and an output end of the switch transistor circuit being connected to a control end of the lamp module; a main control module, an output end of the main control module being connected to the switch transistor drive circuit, and used to receive an on signal of the lamp module and output a control signal, so that the switch transistor drive circuit periodically controls on and off states of the switch transistor in the switch transistor circuit on the basis of the control signal, until a duration for which the main control module outputs the control signal reaches a target duration.

Description

Soft-start control circuit, method, device for lamp modules and auxiliary lamps

[0001] Related applications

[0002] This application claims priority to Chinese patent applications filed on November 26, 2024, with application number 202411708628.7 and 202411711520.3, the entire contents of which are incorporated herein by reference.

[0003] Technical Field

[0004] This application relates to the field of power-assisted lamp control technology, and in particular to a soft-start control circuit, method, device for a lamp module and a power-assisted lamp. Background Technology

[0005] Currently, the power-assisted lights used in devices such as electric bicycles typically employ electronic switching transistors (such as MOSFETs) to achieve basic control of the light module within the power-assisted light.

[0006] However, lamp modules are often equipped with a large capacitor, which can cause a large inrush current when the lamp module is turned on. This inrush current far exceeds the current stress that the electronic switch tube can withstand, which can easily cause the electronic switch tube to fail to control the lamp module, resulting in poor control reliability. Summary of the Invention

[0007] The main objective of this application is to provide a soft-start control circuit for a lamp module, which aims to improve the reliability of lamp module control.

[0008] To achieve the above objectives, this application proposes a soft-start control circuit for a lamp module, comprising:

[0009] Switching transistor drive circuit;

[0010] A switching transistor circuit includes at least one switching transistor, the input terminal of the switching transistor circuit is connected to the switching transistor driving circuit, and the output terminal of the switching transistor circuit is connected to the control terminal of the lamp module.

[0011] The main control module, whose output terminal is connected to the switching transistor driving circuit, is used to receive the turn-on signal of the lamp module and output a control signal so that the switching transistor driving circuit periodically controls the switching transistor in the switching transistor circuit to turn on and off according to the control signal until the duration of the control signal output by the main control module reaches the target time.

[0012] Wherein, the conduction time of the switching transistor in the switching transistor circuit within one cycle is less than the turn-off time, and is less than or equal to the time it takes for the inductance current of the cable between the switching transistor circuit and the charging capacitor in the lamp module to reach a stable state; the target time is greater than or equal to the time required for the charging capacitor to be charged to saturation.

[0013] In one embodiment, the switching transistor driving circuit includes a first resistor and a second resistor;

[0014] The first end of the first resistor is connected to the output terminal of the main control module, the second end of the first resistor is connected to the first end of the second resistor and the input terminal of the switching transistor circuit, and the second end of the second resistor is grounded.

[0015] In one embodiment, the switching transistor circuit includes a first switching transistor and a second switching transistor;

[0016] The first terminal of the first switch is connected to the switch drive circuit, the second terminal of the first switch is connected to the first terminal of the second switch, the second terminal of the second switch is grounded, and the third terminals of the first switch and the second switch are connected together to the control terminal of the lamp module.

[0017] In one embodiment, both the first switching transistor and the second switching transistor are NPN transistors.

[0018] To achieve the above objectives, this application also provides a soft-start control method for a lamp module, comprising:

[0019] Upon receiving the turn-on signal of the lamp module, the system periodically controls the switching transistors in the switching transistor circuit used to turn on the lamp module to turn on and off until the control duration reaches the target time.

[0020] Wherein, the conduction time of the switching transistor in the switching transistor circuit within one cycle is less than the turn-off time, and is less than or equal to the time it takes for the inductance current of the cable between the switching transistor circuit and the charging capacitor in the lamp module to reach a stable state; the target time is greater than or equal to the time required for the charging capacitor to be charged to saturation.

[0021] In one embodiment, the method further includes:

[0022] Obtain the maximum current that the switching transistor in the switching transistor circuit can withstand and the inductance value of the cable;

[0023] Based on the maximum current that the switching transistor can withstand and the inductance value of the cable, the conduction time of the switching transistor in the switching transistor circuit within one cycle is determined.

[0024] In one embodiment, the method further includes:

[0025] The temperature rise of the switching transistor in the switching circuit when it is in the on state is obtained;

[0026] Based on the temperature, determine the turn-off time of the switching transistor in the switching transistor circuit within one cycle.

[0027] In one embodiment, the method further includes:

[0028] The target time is determined based on the capacitance of the charging capacitor.

[0029] To achieve the above objectives, this application also proposes an auxiliary lamp, which includes a lamp module and a soft-start control circuit for the lamp module as described above, wherein the output terminal of the soft-start control circuit is connected to the control terminal of the lamp module.

[0030] To achieve the above objectives, this application also provides a computer-readable storage medium storing a computer program that is executed by a processor to implement the soft-start control method for the lamp module as described above.

[0031] To achieve the above objectives, this application proposes a pre-start control circuit for a lamp module, comprising:

[0032] A driving voltage supply circuit is connected to the driving switch of the lamp module and is used to provide driving voltage to the driving switch.

[0033] A current sampling circuit is connected to the driving switch transistor and is used to collect the operating current of the driving switch transistor.

[0034] The main control module is connected to the drive voltage supply circuit and the current sampling circuit respectively. After receiving the turn-on signal of the lamp module, the main control module gradually outputs control signals so that the drive voltage supply circuit gradually increases the drive voltage according to the control signals until the operating current of the drive switch reaches the target current; the target current is less than or equal to the maximum current that the drive switch can withstand.

[0035] In one embodiment, the drive voltage providing circuit includes a first resistor, a second resistor, and a first capacitor;

[0036] The first end of the first resistor is connected to the signal output terminal of the main control module, the second end of the first resistor is connected to the first end of the driving switch and the first end of the second resistor, the first end of the second resistor is also connected to the first end of the first capacitor, and the second end of the second resistor is grounded to the second end of the first capacitor.

[0037] In one embodiment, the current sampling circuit includes a sampling resistor;

[0038] The first end of the sampling resistor is connected to the signal input terminal of the main control module and the second end of the driving switch, respectively. The second end of the sampling resistor is grounded and is used to collect the operating current of the driving switch.

[0039] In one embodiment, the sampling circuit further includes a filtering circuit;

[0040] The filtering circuit is connected between the signal input terminal of the main control module and the first terminal of the sampling resistor, and is used to filter the collected operating current.

[0041] In one embodiment, the filter circuit includes a third resistor and a second capacitor;

[0042] The first end of the second capacitor is connected to the signal input terminal of the main control module and the first end of the third resistor, respectively. The second end of the second capacitor is grounded, and the second end of the third resistor is connected to the first end of the sampling resistor.

[0043] To achieve the above objectives, this application also provides a pre-start control method for a lamp module, comprising:

[0044] Upon receiving the turn-on signal of the lamp module, an initial drive voltage is provided to the drive switch transistor of the lamp module;

[0045] Obtain the current operating current of the driving switch transistor of the lamp module;

[0046] When it is determined that the current operating current has not reached the target current, the driving voltage supplied to the driving switch of the lamp module is gradually increased until the current operating current reaches the target current.

[0047] Wherein, the target current is less than or equal to the maximum current that the driving switch can withstand.

[0048] In one embodiment, the method further includes:

[0049] Obtain the ambient temperature;

[0050] The target current is determined based on the power of the driving switch and the ambient temperature.

[0051] In one embodiment, the step of gradually increasing the driving voltage supplied to the driving switch of the lamp module includes:

[0052] Gradually increase the duty cycle of the control signal to increase the driving voltage.

[0053] In one embodiment, the step of gradually increasing the duty cycle of the control signal includes:

[0054] The duty cycle increment is determined based on the capacitance of the charging capacitor in the lamp module.

[0055] Based on the increase in duty cycle, the duty cycle of the control signal is gradually increased.

[0056] To achieve the above objectives, this application also proposes an auxiliary lamp, which includes a lamp module, a drive switch transistor, and a pre-start control circuit for the lamp module as described above, wherein the drive switch transistor is connected to the lamp module and the pre-start control circuit respectively.

[0057] To achieve the above objectives, this application also provides a computer-readable storage medium storing a computer program that is executed by a processor to implement the pre-start control method for the lamp module as described above.

[0058] To achieve the above objectives, this application also proposes a start-up control device for a lamp module assembly. The start-up control device includes a processor and a memory. The memory stores a start-up control program, which is called by the processor to implement the soft-start control method or pre-start control method for the lamp module assembly as described above. Attached Figure Description

[0059] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art 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 the structures shown in these drawings without creative effort.

[0060] Figure 1 is a schematic diagram of the module structure of the soft-start control circuit of the lamp module provided in the embodiment of this application;

[0061] Figure 2 is a schematic diagram of the circuit structure of the soft-start control circuit of the lamp module provided in the embodiment of this application;

[0062] Figure 3 is a flowchart illustrating the soft-start control method for the lamp module provided in an embodiment of this application;

[0063] Figure 4 is a schematic diagram illustrating the implementation principle of the soft-start control method for the lamp module provided in the embodiments of this application;

[0064] Figure 5 is a schematic diagram of the hardware operating environment of the lamp module start-up control device provided in the embodiment of this application;

[0065] Figure 6 is a schematic diagram of a module structure of the pre-start control circuit of the lamp module provided in the embodiment of this application;

[0066] Figure 7 is a schematic diagram of a circuit structure of the pre-start control circuit of the lamp module provided in an embodiment of this application;

[0067] Figure 8 is a schematic diagram of another module structure of the pre-start control circuit of the lamp module provided in the embodiment of this application;

[0068] Figure 9 is another circuit structure diagram of the pre-start control circuit of the lamp module provided in the embodiment of this application;

[0069] Figure 10 is a flowchart illustrating the pre-start control method for the lamp module provided in an embodiment of this application;

[0070] Figure 11 is a schematic diagram illustrating the implementation principle of the pre-start control method for the lamp module provided in the embodiment of this application.

[0071] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0072] Explanation of icon numbers:

[0073] 10. Switching transistor driver circuit; 20. Switching transistor circuit; 30. Main control module; R1~R2, resistors; Q1~Q2, switching transistors; C1, charging capacitor; D1, diode; GND, ground; VDD, power supply;

[0074] 40. Drive voltage supply circuit; 50. Current sampling circuit; 51. Filtering circuit; Q3. Drive switch transistor; R4~R6. Resistors; C2~C3. Capacitors; Rx. Sampling resistor;

[0075] 101. Processing device; 102. ROM; 103. Storage device; 104. RAM; 105. Bus; 106. I / O interface; 107. Input device; 108. Output device; 109. Communication device. Embodiments of the present invention

[0076] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0077] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0078] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0079] Currently, the power-assisted lights used in devices such as electric bicycles typically employ electronic switching transistors (such as MOSFETs) to achieve basic control of the light module within the power-assisted light.

[0080] However, lamp modules are often equipped with a large capacitor, which can cause a large inrush current when the lamp module is turned on. This inrush current far exceeds the current stress that the electronic switch tube can withstand, which can easily cause the electronic switch tube to fail to control the lamp module, resulting in poor control reliability.

[0081] Based on this, this application proposes a soft-start control circuit for a lamp module. Please refer to Figure 1 (in which D1 is a diode, VCC is a power supply, and C1 is a charging capacitor). The soft-start control circuit may include a switching transistor drive circuit 10, a switching transistor circuit 20 including at least one switching transistor, and a main control module 30.

[0082] The input terminal of the switching transistor circuit 20 is connected to the switching transistor driver circuit 10, the output terminal of the switching transistor circuit 20 is connected to the control terminal of the lamp module, and the output terminal of the main control module 30 is connected to the switching transistor driver circuit 10.

[0083] The main control module 30 is used to receive the turn-on signal of the lamp module and output a control signal so that the switching tube drive circuit 10 periodically controls the switching tube in the switching tube circuit 20 to turn on and off according to the control signal until the duration of the control signal output by the main control module 30 reaches the target time.

[0084] Among them, the conduction time of the switching transistor in the switching transistor circuit 20 within one cycle is less than the turn-off time, and less than or equal to the time when the inductance current of the cable between the switching transistor circuit 20 and the charging capacitor C1 in the lamp module reaches a stable state; the target time is greater than or equal to the time required for the charging capacitor C1 to be charged to saturation.

[0085] It should be noted that the switching transistor can be a MOSFET, a bipolar transistor, an IGBT (Insulated Gate Bipolar Transistor), or other types of field-effect transistors, etc., and this embodiment does not specifically limit it. The lamp module's turn-on signal is used to indicate that the lamp module needs to be turned on.

[0086] Additionally, it should be noted that the main control module 30 can be a microcontroller unit (MCU), a controller, or other control chip or control circuit with control functions; this embodiment does not specifically limit this. The control signal output by the main control module 30 can be a PWM (Pulse Width Modulation) signal or other signal that causes the switching transistor to turn on and off.

[0087] This embodiment provides a soft-start control circuit for a lamp module, including a switching transistor drive circuit 10; a switching transistor circuit 20, including at least one switching transistor, whose input terminal is connected to the switching transistor drive circuit 10 and whose output terminal is connected to the control terminal of the lamp module; and a main control module 30, whose output terminal is connected to the switching transistor drive circuit 10, for receiving the lamp module's turn-on signal and outputting a control signal, so that the switching transistor drive circuit 10 periodically controls the switching transistor in the switching transistor circuit 20 to turn on and off according to the control signal, until the duration of the main control module 30 outputting the control signal reaches a target time; wherein, the on-time of the switching transistor in the switching transistor circuit 20 in one cycle is less than the off-time, and less than or equal to the time when the inductance current of the cable between the switching transistor circuit 20 and the charging capacitor C1 in the lamp module reaches stability; the target time is greater than or equal to the time required for the charging capacitor C1 to charge to saturation.

[0088] In summary, this embodiment utilizes the control signal output by the main control module 30 to repeatedly control the switching transistor in the switching transistor circuit 20 to turn on and off during the lamp module activation process, thereby intermittently charging the charging capacitor C1 in the lamp module. Since the on-time of each switching transistor is shorter than the off-time, sufficient heat dissipation time is provided for the cable, allowing it to dissipate heat completely. Furthermore, the on-time of each switching transistor is less than or equal to the time it takes for the inductance current of the cable between the switching transistor circuit 20 and the charging capacitor C1 in the lamp module to reach a stable state. Therefore, it can be ensured that the circuit charges the charging capacitor C1 each time before the inductance current of the cable reaches a stable state, effectively avoiding the generation of inrush current. In addition, the duration of the control signal output by the main control module 30 is greater than or equal to the time required for the charging capacitor C1 to reach saturation, ensuring that the circuit can charge the charging capacitor C1 in the lamp module to saturation.

[0089] Therefore, this embodiment utilizes the inductive characteristics of the cable to achieve intermittent charging of the charging capacitor C1 in the lamp module, effectively avoiding the generation of inrush current, ensuring that the drive switch can effectively control the lamp module, and improving the reliability of lamp module control.

[0090] In one embodiment, referring to FIG2, the switching transistor drive circuit 10 may include a first resistor R1 and a second resistor R2.

[0091] The first end of the first resistor R1 is connected to the output terminal of the main control module 30, the second end of the first resistor R1 is connected to the first end of the second resistor R2 and the input terminal of the switching transistor circuit 20, and the second end of the second resistor R2 is grounded to GND.

[0092] Understandably, during the high-level phase of the control signal, the first resistor R1 and the second resistor R2 will divide the control signal to limit the current flowing into the switching transistor circuit 20, ensuring that the current meets the conduction condition of the switching transistor in the switching transistor circuit 20, thereby controlling the switching transistor in the switching transistor circuit 20 to conduct. During the low-level phase of the control signal, the first resistor R1 and the second resistor R2 will assist in rapidly reducing the current in the switching transistor, causing the switching transistor to turn off.

[0093] In one embodiment, referring to FIG2, the switching transistor circuit 20 may include a first switching transistor Q1 and a second switching transistor Q2;

[0094] The first terminal of the first switch Q1 is connected to the switch drive circuit 10, the second terminal of the first switch Q1 is connected to the first terminal of the second switch Q2, the second terminal of the second switch Q2 is grounded to GND, and the third terminal of the first switch Q1 and the third terminal of the second switch Q2 are connected together to the control terminal of the lamp module.

[0095] In this configuration, both the first switching transistor Q1 and the second switching transistor Q2 can be NPN transistors.

[0096] It should be noted that the first terminal of the first switch Q1 is the input terminal of the switch circuit 20, and the third terminal of the first switch Q1 and the third terminal of the second switch Q2 together serve as the output terminal of the switch circuit 20.

[0097] In this embodiment, the switching circuit 20 is composed of two NPN transistors, so that when the switching circuit 20 is working, these two NPN transistors will operate in the amplification cutoff region. In this case, the switching speed of the switching transistors is very fast, and the switching transistors in the switching circuit 20 can quickly enter the conduction state, thereby improving the turn-on efficiency of the lamp module.

[0098] Furthermore, this application embodiment also provides a soft-start control method for a lamp module. Referring to Figure 3, the soft-start control method for a lamp module may include step S10:

[0099] Step S10: Upon receiving the turn-on signal of the lamp module, periodically control the switching transistor in the switching transistor circuit used to turn on the lamp module to turn on and off until the control duration reaches the target time.

[0100] Among them, the conduction time of the switching transistor in the switching transistor circuit is less than the turn-off time in one cycle, and is less than or equal to the time when the inductance current of the cable between the switching transistor circuit and the charging capacitor in the lamp module reaches a stable state; the target time is greater than or equal to the time required for the charging capacitor to be charged to saturation.

[0101] It should be noted that the switching transistor in the switching transistor drive circuit of the soft-start control circuit can be used to periodically control the on and off of the switching transistor used to turn on the lamp module. The on-time of the switching transistor in one cycle can be determined using the maximum current that the switching transistor in the switching transistor circuit can withstand and the inductance value of the cable. The specific determination process can include steps S01~S02:

[0102] Step S01: Obtain the maximum current that the switching transistor in the switching transistor circuit can withstand and the inductance value of the cable;

[0103] Step S02: Determine the conduction time of the switching transistor in the switching transistor circuit within one cycle based on the maximum current that the switching transistor can withstand and the inductance value of the cable.

[0104] In determining the conduction time of the switching transistor in one cycle based on the maximum current the switching transistor can withstand and the inductance of the cable, the conduction time can be directly calculated using the maximum current the switching transistor can withstand and the inductance of the cable. The specific calculation process can be expressed as Formula 1 below. Alternatively, the conduction time corresponding to different maximum current and inductance values ​​of the switching transistor can be calculated in advance and recorded using a relationship table. Therefore, the conduction time corresponding to the maximum current the switching transistor can withstand and the inductance of the cable can be found in the preset relationship table using the maximum current the switching transistor can withstand and the inductance of the cable as an index, and this value can be used as the conduction time of the switching transistor in one cycle. This embodiment does not specifically limit the implementation of step S02.

[0105] Formula 1

[0106] Where T is the conduction time, L is the inductance of the cable, I is the maximum current that the switching transistor can withstand, and Vcc is the voltage of the power supply.

[0107] It should be noted that the time calculated using the above formula is actually the time required for the inductor to accumulate energy from zero until the current tends to stabilize.

[0108] Furthermore, the off-time of the switching transistor in the switching transistor circuit within one cycle can be determined using the temperature rise of the switching transistor in the on-state. The specific determination process may include steps S03~S04:

[0109] Step S03: Obtain the temperature rise of the switching transistor in the switching transistor circuit when it is in the conducting state;

[0110] Step S04: Determine the turn-off time of the switching transistor in the switching transistor circuit within one cycle based on the temperature.

[0111] In determining the turn-off time of the switching transistor in a switching circuit within one cycle based on temperature, the thermal balance formula can be used to directly calculate the turn-off time of the switching transistor within one cycle using the temperature rise of the switching transistor in the on state. Alternatively, the turn-off times corresponding to different temperatures can be calculated in advance and recorded using a relational table. Therefore, the turn-off time can be found in a preset relational table using the temperature rise of the switching transistor in the on state as an index, and thus used as the turn-off time of the switching transistor in a switching circuit within one cycle. This embodiment does not specifically limit the implementation of step S04.

[0112] It should be noted that as an inductor accumulates energy from zero until the current stabilizes, its heat gradually increases. Therefore, based on the law of thermal equilibrium, by utilizing the temperature rise of the switching transistor in the on-state of the switching circuit, the time required for the inductor to completely dissipate heat can be determined. This determined time is then used as the off-state time of the switching transistor within one cycle. This not only ensures complete heat dissipation of the inductor, avoiding inrush current, but also prevents excessively long off-state times from causing prolonged capacitor discharge, which could negatively impact the switching efficiency of the lamp module, thus guaranteeing the lamp module's switching efficiency.

[0113] Furthermore, the target time can be determined using the capacitance of the charging capacitor. The specific determination process may include step S05:

[0114] Step S05: Determine the target time based on the capacitance of the charging capacitor.

[0115] In determining the target time based on the capacitance of the charging capacitor, the target time can be calculated directly using the capacitance; alternatively, the times corresponding to different capacitances can be calculated in advance and recorded using a relationship table. Therefore, the target time can be obtained by looking up the corresponding time in the preset relationship table using the capacitance of the charging capacitor as an index. This embodiment does not specifically limit the implementation of step S05.

[0116] The soft-start control method for lamp modules provided in this application can improve the reliability of lamp module control. Compared with the prior art, the beneficial effects of the soft-start control method for lamp modules provided in this application are the same as those of the soft-start control circuit for lamp modules provided in the above embodiments, and other technical features in the soft-start control method for lamp modules are the same as those disclosed in the above embodiments, and will not be repeated here.

[0117] For example, to help understand the implementation principle of the soft-start control method for the lamp module of this application, please refer to Figure 4. As shown in Figure 4, after receiving the turn-on signal of the lamp module, the main control module will output a control signal. The control signal output by the main control module will run at a high level for time t0 and a low level for time t1 within each signal period t. Thus, the switching transistor drive circuit will periodically control the switching transistor in the switching transistor circuit to be turned on for time t0 and turned off for time t1 until the duration of the control signal output by the main control module reaches the target time T. The charging capacitor in the lamp module is then fully charged, and the main control module outputs a high level to complete the lamp-on control.

[0118] It should be noted that this example is only for the purpose of assisting in understanding this application and does not constitute a limitation on the soft start control method of the lamp module of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0119] Furthermore, this application also provides a power-assisted lamp, which may include a lamp module and a soft-start control circuit for the lamp module in the above embodiments. The output terminal of the soft-start control circuit is connected to the control terminal of the lamp module. It is understood that since the power-assisted lamp uses the aforementioned soft-start control circuit for the lamp module, the embodiments of this power-assisted lamp include all the technical solutions of all embodiments of the aforementioned soft-start control circuit for the lamp module, and the achieved technical effects are completely the same, and will not be repeated here.

[0120] It should be noted that the assist light can be a light used on an electric bicycle or a light used on other products to achieve the assist function. This embodiment does not make any specific limitation on this.

[0121] For example, consider the power-assisted light used on a power-assisted bicycle. Generally, the electronic control system of a power-assisted bicycle may include a system control drive module, a human-machine interface display instrument, and four light modules (front, rear, left, and right). Based on this, in practical applications, the soft-start control circuit of the light module can be jointly housed in the system control drive module along with the diodes connected to the switching transistor circuit.

[0122] Currently, the power-assisted lights used in devices such as electric bicycles typically employ electronic switching transistors (such as MOSFETs) to achieve basic control of the light module within the power-assisted light.

[0123] However, lamp modules are often equipped with a large capacitor, which can cause a large inrush current when the lamp module is turned on. This inrush current far exceeds the current stress that the electronic switch tube can withstand, which can easily cause the electronic switch tube to fail to control the lamp module, resulting in poor control reliability.

[0124] Based on this, this application proposes a pre-start control circuit for a lamp module. Please refer to Figure 6 (where D1 is a diode, VCC is a power supply, and C1 is a charging capacitor). The pre-start control circuit may include a drive voltage supply circuit 40, a current sampling circuit 50, and a main control module 30.

[0125] The driving voltage supply circuit 40 is connected to the driving switch Q3 of the lamp module, the current sampling circuit 50 is connected to the driving switch Q3, and the main control module 30 is connected to the driving voltage supply circuit 40 and the current sampling circuit 50 respectively.

[0126] The drive voltage supply circuit 40 is used to provide drive voltage to the drive switching transistor Q3;

[0127] The current sampling circuit 50 is used to collect the operating current of the drive switch Q3;

[0128] The main control module 30 is used to gradually output control signals after receiving the turn-on signal of the lamp module, so that the drive voltage supply circuit 40 gradually increases the drive voltage according to the control signal until the working current of the drive switch Q3 reaches the target current.

[0129] The target current is less than or equal to the maximum current that the drive switch Q3 can withstand.

[0130] It should be noted that the driving switch Q3 can be a MOSFET, transistor, IGBT (Insulated Gate Bipolar Transistor), or other types of field-effect transistors, etc., and this embodiment does not specifically limit it. The driving switch Q3 can be used to control the switching on and off of the lamp module. The operating current of the driving switch Q3 refers to the current flowing through it. The driving voltage and the operating current of the driving switch Q3 are positively correlated; that is, the higher the driving voltage, the higher the operating current of the driving switch Q3; the lower the driving voltage, the lower the operating current of the driving switch Q3. The lamp module's turn-on signal is used to indicate that the lamp module needs to be turned on.

[0131] Additionally, it should be noted that the main control module 30 can be a microcontroller unit (MCU), a controller, or other control chip or control circuit with control functions; this embodiment does not specifically limit this. The control signal output by the main control module 30 can be a PWM (Pulse Width Modulation) signal or other signal capable of adjusting the magnitude of the drive voltage.

[0132] This embodiment provides a pre-start control circuit for a lamp module, including a drive voltage supply circuit 40 connected to the drive switch Q3 of the lamp module, used to provide drive voltage to the drive switch Q3; a current sampling circuit 50 connected to the drive switch Q3, used to collect the operating current of the drive switch Q3; and a main control module 30 connected to both the drive voltage supply circuit 40 and the current sampling circuit 50, used to gradually output control signals after receiving the lamp module's turn-on signal, so that the drive voltage supply circuit 40 gradually increases the drive voltage according to the control signals until the operating current of the drive switch Q3 reaches the target current; the target current is less than or equal to the maximum current that the drive switch Q3 can withstand.

[0133] In summary, this embodiment utilizes the control signal output by the main control module 30 to gradually increase the driving voltage supplied by the driving voltage supply circuit 40 to the driving switch Q3 during the lamp module activation process. This gradually increases the operating current of the driving switch Q3 until the current sampling circuit 50 detects that the operating current of the driving switch Q3 has reached the target current, at which point the increase in driving voltage stops. Because the operating current of the driving switch Q3, which controls the lamp module, increases gradually within its maximum withstand current range during the lamp module activation process, rather than increasing instantaneously, the generation of inrush current is avoided. This ensures that the driving switch Q3 can effectively control the lamp module, improving the reliability of lamp module control.

[0134] In one embodiment, referring to FIG7, the drive voltage supply circuit 40 may include a first resistor R4, a second resistor R5 and a first capacitor C2;

[0135] The first end of the first resistor R4 is connected to the signal output terminal of the main control module 30. The second end of the first resistor R4 is connected to the first end of the driving switch Q3 and the first end of the second resistor R5. The first end of the second resistor R5 is also connected to the first end of the first capacitor C2. The second end of the second resistor R5 and the second end of the first capacitor C2 are grounded to GND.

[0136] It is understandable that the first resistor R4, the second resistor R5, and the first capacitor C2 form an integrating circuit. This circuit can obtain the driving voltage by integrating the control signal output by the main control module 30.

[0137] In one embodiment, referring to Figure 7, the current sampling circuit 50 may include a sampling resistor Rx; the first end of the sampling resistor Rx is connected to the signal input terminal of the main control module 30 and the second end of the driving switch Q3, respectively, and the second end of the sampling resistor Rx is grounded to GND, for collecting the operating current of the driving switch Q3.

[0138] It should be noted that, in addition to using the sampling resistor Rx to collect the operating current of the driving switch Q3, other feasible implementations may also use a current sensor, shunt, or other circuits or devices with current acquisition function to collect the operating current of the driving switch Q3. This embodiment does not specifically limit this.

[0139] Furthermore, in another feasible implementation, referring to Figure 8, the current sampling circuit 50 may also include a filter circuit 51; the filter circuit 51 is connected between the signal input terminal of the main control module 30 and the first terminal of the sampling resistor Rx, and is used to filter the collected operating current.

[0140] It should be noted that the filter circuit 51 can be an RC filter circuit, an LC filter circuit, or other circuits with filtering functions, etc., and this embodiment does not specifically limit it. Among them, when the filter circuit 51 is an RC filter circuit, please refer to Figure 9, which can include a third resistor R6 and a second capacitor C3; the first end of the second capacitor C3 is connected to the signal input terminal of the main control module 30 and the first end of the third resistor R6, the second end of the second capacitor C3 is grounded to GND, and the second end of the third resistor R6 is connected to the first end of the sampling resistor Rx.

[0141] In this embodiment, a filter circuit 51 is set between the signal input terminal of the main control module 30 and the first terminal of the sampling resistor Rx to filter the working current collected by the sampling resistor Rx, thereby filtering out noise in the working current, so that the main control module 30 receives a working current with higher accuracy and better stability, thereby further improving the reliability of the lamp module control.

[0142] Furthermore, this application embodiment also provides a pre-start control method for a lamp module. Referring to Figure 10, the pre-start control method for a lamp module may include steps S20 to S40:

[0143] Step S20: Upon receiving the turn-on signal of the lamp module, provide the initial drive voltage to the drive switch of the lamp module;

[0144] It should be noted that the initial drive voltage refers to the drive voltage initially supplied to the drive switch after receiving the turn-on signal from the lamp module. The initial drive voltage is a small voltage (assuming the drive switch can reach the target current under the action of the target voltage, then the initial drive voltage needs to be less than the target voltage). It can be a default value or can be flexibly set by the user according to the actual situation. This embodiment does not impose specific limitations on it.

[0145] Additionally, it should be noted that the initial drive voltage can be provided to the drive switch of the lamp module through the voltage supply circuit in the pre-start control circuit. Since the magnitude of the drive voltage provided by the voltage supply circuit in the pre-start control circuit to the drive switch of the lamp module is determined by the duty cycle of the control signal output by the main control module, to ensure that the voltage supply circuit can provide the initial drive voltage to the drive switch of the lamp module after receiving the lamp module's turn-on signal, the main control module can be configured to output a control signal with a duty cycle corresponding to the initial drive voltage after receiving the lamp module's turn-on signal.

[0146] Step S30: Obtain the current operating current of the driving switch transistor of the lamp module;

[0147] It should be noted that the current operating current refers to the operating current of the driving switch at the current moment. The current operating current of the driving switch of the lamp module can be obtained through the current acquisition circuit in the pre-start control circuit.

[0148] Step S40: When it is determined that the current operating current has not reached the target current, gradually increase the driving voltage supplied to the driving switch of the lamp module until the current operating current reaches the target current.

[0149] The target current is less than or equal to the maximum current that the driving switch can withstand.

[0150] It should be noted that the target current can be determined using the power of the driving switch and the ambient temperature of the operating environment of the driving switch. The specific determination process may include steps S01-S02:

[0151] Step S01: Obtain the ambient temperature;

[0152] Step S02: Determine the target current based on the power of the driving switch and the ambient temperature.

[0153] In determining the target current based on the power of the driving switch and the ambient temperature, the target current can be calculated directly using the power of the driving switch and the ambient temperature; alternatively, the current corresponding to different power and ambient temperatures can be calculated in advance and recorded using a relationship table. Therefore, using the power of the driving switch and the ambient temperature as an index, the current corresponding to both power and ambient temperature can be found in the preset relationship table and used as the target current. This embodiment does not specifically limit the implementation of step S02.

[0154] The pre-start control method for lamp modules provided in this application can improve the reliability of lamp module control. Compared with the prior art, the beneficial effects of the pre-start control method for lamp modules provided in this application are the same as the beneficial effects of the pre-start control circuit for lamp modules provided in the above embodiments, and other technical features in the pre-start control method for lamp modules are the same as those disclosed in the above embodiments, and will not be repeated here.

[0155] In one embodiment, the step of gradually increasing the driving voltage supplied to the driving switch of the lamp module may include step S31:

[0156] Step S31: Gradually increase the duty cycle of the control signal to increase the driving voltage.

[0157] It should be noted that the duty cycle of the control signal refers to the ratio of the time the control signal is at a high level (or effective level) within one cycle to the total cycle time. The driving voltage is positively correlated with the duty cycle of the control signal; that is, the larger the duty cycle of the control signal, the larger the driving voltage; and the smaller the duty cycle of the control signal, the smaller the driving voltage.

[0158] When gradually increasing the duty cycle of the control signal, the duty cycle can be gradually increased by the default set duty cycle increment; or the duty cycle increment can be flexibly determined according to the charging capacitor in the lamp module, so as to gradually increase the duty cycle of the control signal by using the flexibly determined duty cycle increment (the specific implementation process can be referred to in the following steps S311~S312). This embodiment does not make specific limitations on this.

[0159] Step S311: Determine the duty cycle increase based on the capacitance of the charging capacitor in the lamp module;

[0160] It should be noted that the duty cycle increase determined based on the capacitance of the charging capacitor in the lamp module is essentially the rising slope of the charging current during the charging process.

[0161] In determining the duty cycle increase based on the capacitance of the charging capacitor in the lamp module, the duty cycle increase can be calculated directly using the capacitance; alternatively, the duty cycle increase corresponding to different capacitances can be pre-calculated and recorded using a relationship table. Therefore, the corresponding duty cycle increase can be found in the preset relationship table using the capacitance of the charging capacitor in the lamp module as an index. This embodiment does not specifically limit the implementation of step S311.

[0162] Step S312: Based on the increase in duty cycle, gradually increase the duty cycle of the control signal.

[0163] In the process of gradually increasing the duty cycle of the control signal based on the duty cycle increment, each time the duty cycle of the control signal is increased by the duty cycle increment, it is determined whether the current operating current of the driving switch has reached the target current. If it has not reached the target current, the duty cycle of the control signal can be increased by the duty cycle increment. If it has reached the target current, the increase of the duty cycle of the control signal will stop and a high level will be output to complete the light-on control.

[0164] Understandably, by utilizing the capacitance of the charging capacitor in the lamp module, the amount by which the duty cycle of the control signal increases each time is set, thereby ensuring that the operating current of the drive switching transistor changes smoothly as it gradually increases, effectively preventing sudden fluctuations in current and thus ensuring the stability of the system.

[0165] For example, to help understand the principle of gradually increasing the operating current of the driving switch by gradually increasing the duty cycle of the control signal, please refer to Figure 11. As shown in Figure 11, after receiving the turn-on signal from the lamp module, starting from time t1, the duty cycle of the control signal output by the main control module gradually increases (corresponding to the gradually widening width of the high level in the figure), thereby gradually increasing the driving voltage provided by the driving voltage supply circuit. Based on this, the operating current of the driving switch gradually increases from zero until it reaches the target current at time t2, at which point the driving switch is turned on, and the main control module outputs a high level. This completes the lamp-on control.

[0166] It should be noted that this example is only for the purpose of assisting in understanding this application and does not constitute a limitation on the pre-start control method of the lamp module of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0167] In addition, this application embodiment also provides a start-up control device for a lamp module assembly. The start-up control device may include a processor and a memory. The memory stores a start-up control program, which is called by the processor to implement the pre-start-up control method for the lamp module assembly provided in the above embodiment.

[0168] Referring now to Figure 5, a schematic diagram of a start-up control device suitable for implementing the embodiments of this application is shown. The start-up control device for the lamp module shown in Figure 5 is merely an example and should not impose any limitation on the function and scope of use of the embodiments of this application.

[0169] As shown in Figure 5, the start-up control device for the lamp module may include a processing unit 101 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 102 or a program loaded from a storage device 103 into a random access memory (RAM) 104. The RAM 104 also stores various programs and data required for the operation of the start-up control device for the lamp module. The processing unit 101, ROM 102, and RAM 104 are interconnected via a bus 105. An input / output (I / O) interface 106 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 106: input devices 107 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 108 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 103 including, for example, magnetic tape, hard disk, etc.; and communication devices 109. Communication device 109 allows the lamp module's start-up control device to communicate wirelessly or wiredly with other devices to exchange data. Although the figures show start-up control devices for lamp modules with various systems, it should be understood that implementation or possession of all the systems shown is not required. More or fewer systems may be implemented alternatively.

[0170] In particular, according to embodiments of this disclosure, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this disclosure include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 103, or installed from ROM 102. When the computer program is executed by processing device 101, it performs the functions defined in the methods of the embodiments of this application.

[0171] The lamp module startup control device provided in this application embodiment can improve the reliability of lamp module control. Compared with the prior art, the beneficial effects of the lamp module startup control device provided in this application embodiment are the same as the beneficial effects of the lamp module pre-start control method provided in the above embodiments, and will not be repeated here.

[0172] It should be understood that various parts of the embodiments of this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0173] The above description is merely a specific implementation of the embodiments of this application, but the protection scope of the embodiments of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of the embodiments of this application. Therefore, the protection scope of the embodiments of this application should be determined by the protection scope of the above claims.

[0174] Furthermore, this application also provides a power-assisted lamp, which may include a lamp module, a drive switch transistor, and a pre-start control circuit for the lamp module as described in the above embodiments. The drive switch transistor is connected to both the lamp module and the pre-start control circuit. It is understood that since the power-assisted lamp uses the aforementioned pre-start control circuit for the lamp module, the embodiments of this power-assisted lamp encompass all the technical solutions of all embodiments of the aforementioned pre-start control circuit for the lamp module, and the achieved technical effects are completely identical, and will not be repeated here.

[0175] It should be noted that the assist light can be a light used on an electric bicycle or a light used on other products to achieve the assist function. This embodiment does not make any specific limitation on this.

[0176] For example, consider the power-assisted light used on a power-assisted bicycle. Generally, the electronic control system of a power-assisted bicycle may include a system control drive module, a human-machine interface display instrument, and four light modules (front, rear, left, and right). Based on this, in practical applications, the pre-start control circuit of the light module can be jointly housed in the system control drive module along with the drive switch transistor and the diode connected to the drive switch transistor.

[0177] In addition, this application embodiment also provides a start-up control device for a lamp module assembly. The start-up control device may include a processor and a memory. The memory stores a start-up control program, which is called by the processor to implement the soft start-up control method or pre-start-up control method for the lamp module assembly provided in the above embodiment.

[0178] Referring now to Figure 5, a schematic diagram of a start-up control device suitable for implementing the embodiments of this application is shown. The start-up control device for the lamp module shown in Figure 5 is merely an example and should not impose any limitation on the function and scope of use of the embodiments of this application.

[0179] As shown in Figure 5, the start-up control device for the lamp module may include a processing unit 101 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 102 or a program loaded from a storage device 103 into a random access memory (RAM) 104. The RAM 104 also stores various programs and data required for the operation of the start-up control device for the lamp module. The processing unit 101, ROM 102, and RAM 104 are interconnected via a bus 105. An input / output (I / O) interface 106 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 106: input devices 107 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 108 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 103 including, for example, magnetic tape, hard disk, etc.; and communication devices 109. Communication device 109 allows the lamp module's start-up control device to communicate wirelessly or wiredly with other devices to exchange data. Although the figures show start-up control devices for lamp modules with various systems, it should be understood that implementation or possession of all the systems shown is not required. More or fewer systems may be implemented alternatively.

[0180] In particular, according to embodiments of this disclosure, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this disclosure include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 103, or installed from ROM 102. When the computer program is executed by processing device 101, it performs the functions defined in the methods of the embodiments of this application.

[0181] The lamp module startup control device provided in this application embodiment can improve the reliability of lamp module control. Compared with the prior art, the beneficial effects of the lamp module startup control device provided in this application embodiment are the same as the beneficial effects of the soft-start control method or pre-start control method of lamp module provided in the above embodiments, and will not be repeated here.

[0182] It should be understood that various parts of the embodiments of this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0183] The above description is merely a specific implementation of the embodiments of this application, but the protection scope of the embodiments of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of the embodiments of this application. Therefore, the protection scope of the embodiments of this application should be determined by the protection scope of the above claims.

[0184] In addition, this application also provides a computer program product, including a computer program, which, when executed by a processor, implements the soft-start control method or pre-start control method for the lamp module as described above.

[0185] The computer program product provided in this application can improve the reliability of lamp module control. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as the beneficial effects of the soft start control method or pre-start control method of lamp module provided in the above embodiments, and will not be repeated here.

[0186] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the content of this application's specification and drawings under the application concept of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A soft-start control circuit for a lamp module, wherein, The soft-start control circuit includes: Switching transistor drive circuit; A switching transistor circuit includes at least one switching transistor, the input terminal of the switching transistor circuit is connected to the switching transistor driving circuit, and the output terminal of the switching transistor circuit is connected to the control terminal of the lamp module. The main control module, whose output terminal is connected to the switching transistor driving circuit, is used to receive the turn-on signal of the lamp module and output a control signal so that the switching transistor driving circuit periodically controls the switching transistor in the switching transistor circuit to turn on and off according to the control signal until the duration of the control signal output by the main control module reaches the target time. Wherein, the conduction time of the switching transistor in the switching transistor circuit within one cycle is less than the turn-off time, and is less than or equal to the time it takes for the inductance current of the cable between the switching transistor circuit and the charging capacitor in the lamp module to reach a stable state; the target time is greater than or equal to the time required for the charging capacitor to be charged to saturation.

2. The soft-start control circuit for the lamp module as described in claim 1, wherein, The switching transistor drive circuit includes a first resistor and a second resistor. The first end of the first resistor is connected to the output terminal of the main control module, the second end of the first resistor is connected to the first end of the second resistor and the input terminal of the switching transistor circuit, and the second end of the second resistor is grounded.

3. The soft-start control circuit for the lamp module as described in claim 1 or 2, wherein, The switching transistor circuit includes a first switching transistor and a second switching transistor; The first terminal of the first switch is connected to the switch drive circuit, the second terminal of the first switch is connected to the first terminal of the second switch, the second terminal of the second switch is grounded, and the third terminals of the first switch and the second switch are connected together to the control terminal of the lamp module.

4. The soft-start control circuit for the lamp module as described in claim 3, wherein, Both the first and second switching transistors are NPN transistors.

5. A soft-start control method for a lamp module, wherein, The soft-start control method includes: Upon receiving the turn-on signal of the lamp module, the system periodically controls the switching transistors in the switching transistor circuit used to turn on the lamp module to turn on and off until the control duration reaches the target time. Wherein, the conduction time of the switching transistor in the switching transistor circuit within one cycle is less than the turn-off time, and is less than or equal to the time it takes for the inductance current of the cable between the switching transistor circuit and the charging capacitor in the lamp module to reach a stable state; the target time is greater than or equal to the time required for the charging capacitor to be charged to saturation.

6. The soft-start control method for the lamp module as described in claim 5, wherein, The method further includes: Obtain the maximum current that the switching transistor in the switching transistor circuit can withstand and the inductance value of the cable; Based on the maximum current that the switching transistor can withstand and the inductance value of the cable, the conduction time of the switching transistor in the switching transistor circuit within one cycle is determined.

7. The soft-start control method for the lamp module as described in claim 5 or 6, wherein, The method further includes: The temperature rise of the switching transistor in the switching circuit when it is in the on state is obtained; Based on the temperature, determine the turn-off time of the switching transistor in the switching transistor circuit within one cycle.

8. The soft-start control method for the lamp module as described in any one of claims 5 to 7, wherein, The method further includes: The target time is determined based on the capacitance of the charging capacitor.

9. An auxiliary light, wherein, The assist lamp includes a lamp module and a soft-start control circuit for the lamp module as described in any one of claims 1 to 4, wherein the output terminal of the soft-start control circuit is connected to the control terminal of the lamp module.

10. A pre-start control circuit for a lamp module, wherein, The pre-start control circuit includes: A driving voltage supply circuit is connected to the driving switch of the lamp module and is used to provide driving voltage to the driving switch. A current sampling circuit is connected to the driving switch transistor and is used to collect the operating current of the driving switch transistor. The main control module is connected to the drive voltage supply circuit and the current sampling circuit respectively. After receiving the turn-on signal of the lamp module, the main control module gradually outputs control signals so that the drive voltage supply circuit gradually increases the drive voltage according to the control signals until the operating current of the drive switch reaches the target current; the target current is less than or equal to the maximum current that the drive switch can withstand.

11. The pre-start control circuit for the lamp module assembly as described in claim 10, wherein, The driving voltage supply circuit includes a first resistor, a second resistor, and a first capacitor; The first end of the first resistor is connected to the signal output terminal of the main control module, the second end of the first resistor is connected to the first end of the driving switch and the first end of the second resistor, the first end of the second resistor is also connected to the first end of the first capacitor, and the second end of the second resistor is grounded to the second end of the first capacitor.

12. The pre-start control circuit for the lamp module as described in claim 10 or 11, wherein, The current sampling circuit includes a sampling resistor; The first end of the sampling resistor is connected to the signal input terminal of the main control module and the second end of the driving switch, respectively. The second end of the sampling resistor is grounded and is used to collect the operating current of the driving switch.

13. The pre-start control circuit for the lamp module as described in claim 12, wherein, The sampling circuit also includes a filtering circuit; The filtering circuit is connected between the signal input terminal of the main control module and the first terminal of the sampling resistor, and is used to filter the collected operating current.

14. The pre-start control circuit for the lamp module as described in claim 13, wherein, The filter circuit includes a third resistor and a second capacitor; The first end of the second capacitor is connected to the signal input terminal of the main control module and the first end of the third resistor, respectively. The second end of the second capacitor is grounded, and the second end of the third resistor is connected to the first end of the sampling resistor.

15. A pre-start control method for a lamp module, wherein, The pre-start control method includes: Upon receiving the turn-on signal of the lamp module, an initial drive voltage is provided to the drive switch transistor of the lamp module; Obtain the current operating current of the driving switch transistor of the lamp module; When it is determined that the current operating current has not reached the target current, the driving voltage supplied to the driving switch of the lamp module is gradually increased until the current operating current reaches the target current. Wherein, the target current is less than or equal to the maximum current that the driving switch can withstand.

16. The pre-startup control method of a lamp module as claimed in claim 15, wherein, The method further includes: Obtain the ambient temperature; The target current is determined based on the power of the driving switch and the ambient temperature.

17. The pre-start control method for a lamp module as described in claim 15 or 16, wherein, The step of gradually increasing the driving voltage supplied to the driving switch of the lamp module includes: Gradually increase the duty cycle of the control signal to increase the driving voltage.

18. The pre-start control method for the lamp module as described in claim 17, wherein, The step of gradually increasing the duty cycle of the control signal includes: The duty cycle increment is determined based on the capacitance of the charging capacitor in the lamp module. Based on the increase in duty cycle, the duty cycle of the control signal is gradually increased.

19. An auxiliary light, wherein, The assist lamp includes a lamp module, a drive switch transistor, and a pre-start control circuit for the lamp module as described in any one of claims 10 to 14, wherein the drive switch transistor is connected to the lamp module and the pre-start control circuit respectively.

20. A start-up control device for a lamp module assembly, wherein, The startup control device includes a processor and a memory. The memory stores a startup control program, which the processor can call to implement the soft-start control method for the lamp module according to any one of claims 5 to 8 or the pre-start control method for the lamp module according to any one of claims 15 to 18.

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