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

Abstract

This application discloses a soft-start control circuit, method, device, and auxiliary lamp for a lamp module. The soft-start control circuit relates to the field of auxiliary lamp control technology. The soft-start control circuit includes: a switching transistor drive circuit; a switching transistor circuit including at least one switching transistor, with its input connected to the drive circuit and its output connected to the control terminal of the lamp module; and a main control module, whose output is connected to the drive circuit. The main control module receives the lamp module's on / off signal and outputs a control signal, causing the drive circuit to periodically control the switching transistor in the drive circuit to turn on and off according to the control signal until the duration of the main control module's output control signal reaches a target time. This application improves the reliability of lamp module control.

Description

Technical Field

[0001] 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

[0002] Currently, the power assist 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 assist light.

[0003] 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

[0004] 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.

[0005] To achieve the above objectives, this application proposes a soft-start control circuit for a lamp module, comprising:

[0006] Switching transistor drive circuit;

[0007] 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.

[0008] 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.

[0009] 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.

[0010] In one embodiment, the switching transistor driving circuit includes a first resistor and a second resistor;

[0011] 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.

[0012] In one embodiment, the switching transistor circuit includes a first switching transistor and a second switching transistor;

[0013] 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.

[0014] In one embodiment, both the first switching transistor and the second switching transistor are NPN transistors.

[0015] To achieve the above objectives, this application also provides a soft-start control method for a lamp module, comprising:

[0016] 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.

[0017] 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.

[0018] In one embodiment, the method further includes:

[0019] Obtain the maximum current that the switching transistor in the switching transistor circuit can withstand and the inductance value of the cable;

[0020] 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.

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

[0022] The temperature rise of the switching transistor in the switching circuit when it is in the on state is obtained;

[0023] Based on the temperature, determine the turn-off time of the switching transistor in the switching transistor circuit within one cycle.

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

[0025] The target time is determined based on the capacitance of the charging capacitor.

[0026] To achieve the above objectives, this application also proposes a soft-start control device for a lamp module, the soft-start control device comprising a processor and a memory, the memory storing a soft-start control program for the processor to call and implement the soft-start control method for the lamp module as described above.

[0027] 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.

[0028] 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.

[0029] This application provides a soft-start control circuit for a lamp module, including a switching transistor driving circuit; a switching transistor circuit, including at least one switching transistor, whose input terminal is connected to the switching transistor driving circuit and whose output terminal is connected to the control terminal of the lamp module; a main control module, whose output terminal is connected to the switching transistor driving circuit, for receiving the lamp module's turn-on signal and outputting 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 main control module's output control signal reaches a target time; wherein, the on-time of the switching transistor in the switching transistor circuit 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 and the charging capacitor in the lamp module reaches stability; the target time is greater than or equal to the time required for the charging capacitor to charge to saturation.

[0030] In summary, this application utilizes the control signals output by the main control module to repeatedly control the switching transistors in the switching circuit during the lamp module activation process, thereby intermittently charging the charging capacitors in the lamp module. Since the switching transistor's on-time is always shorter than its off-time, sufficient heat dissipation time is provided for the cables, ensuring complete heat dissipation. Furthermore, the on-time is always less than or equal to the time it takes for the inductance current in the cable between the switching transistor circuit and the charging capacitor in the lamp module to stabilize. Therefore, it ensures that the circuit charges the capacitors before the cable's inductance current stabilizes, effectively preventing inrush current. In addition, the duration of the control signal output by the main control module is greater than or equal to the time required for the charging capacitor to reach saturation, ensuring that the circuit can charge the charging capacitors in the lamp module to saturation.

[0031] Therefore, this application utilizes the inductive characteristics of the cable to achieve intermittent charging of the charging capacitor 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. Attached Figure Description

[0032] 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.

[0033] Figure 1 A schematic diagram of the module structure of the soft-start control circuit for the lamp module provided in the embodiments of this application;

[0034] Figure 2 A schematic diagram of the soft-start control circuit for the lamp module provided in this application embodiment;

[0035] Figure 3 A flowchart illustrating the soft-start control method for a lamp module provided in this application embodiment;

[0036] Figure 4 A schematic diagram illustrating the implementation principle of the soft-start control method for the lamp module provided in this application embodiment;

[0037] Figure 5 A schematic diagram of the hardware operating environment of the soft-start control device for the lamp module provided in this application embodiment.

[0038] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0039] Explanation of icon numbers:

[0040] 10. Switching transistor drive 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;

[0041] 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. Detailed Implementation

[0042] 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.

[0043] 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.

[0044] 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.

[0045] Currently, the power assist 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 assist light.

[0046] 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.

[0047] Based on this, this application proposes a soft-start control circuit for a lamp module. Please refer to... Figure 1 (In the figure, 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] In one feasible implementation, please refer to Figure 2 The switching transistor drive circuit 10 may include a first resistor R1 and a second resistor R2.

[0057] 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.

[0058] 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.

[0059] In one feasible implementation, please refer to Figure 2 The switching transistor circuit 20 may include a first switching transistor Q1 and a second switching transistor Q2;

[0060] 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.

[0061] In this configuration, both the first switching transistor Q1 and the second switching transistor Q2 can be NPN transistors.

[0062] 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.

[0063] 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.

[0064] In addition, this application embodiment also provides a soft-start control method for a lamp module, please refer to... Figure 3 The soft-start control method for the lamp module may include step S10:

[0065] 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.

[0066] 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.

[0067] 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 the switching transistor circuit within 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 to S02:

[0068] Step S01: Obtain the maximum current that the switching transistor in the switching transistor circuit can withstand and the inductance value of the cable;

[0069] 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.

[0070] 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.

[0071] T = L * I / Vcc Formula 1

[0072] 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.

[0073] 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.

[0074] 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 to S04:

[0075] Step S03: Obtain the temperature rise of the switching transistor in the switching transistor circuit when it is in the conducting state;

[0076] Step S04: Determine the turn-off time of the switching transistor in the switching transistor circuit within one cycle based on the temperature.

[0077] 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.

[0078] 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.

[0079] Furthermore, the target time can be determined using the capacitance of the charging capacitor. The specific determination process may include step S05:

[0080] Step S05: Determine the target time based on the capacitance of the charging capacitor.

[0081] 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.

[0082] 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.

[0083] 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 .Depend on Figure 4 It can be seen that after receiving the turn-on signal from the lamp module, the main control module will output a control signal. This control signal will run at a high level for time t0 and a low level for time t1 within each signal period t. Consequently, the switching transistor drive circuit will periodically control the switching transistor in the switching circuit to be on for time t0 and off for time t1, until the duration of the main control module's output control signal reaches the target time T. At this point, the charging capacitor in the lamp module will be fully charged, and the main control module will output a high level to complete the lamp-on control.

[0084] 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.

[0085] Furthermore, this application embodiment also provides a soft-start control device for a lamp module assembly. The soft-start control device may include a processor and a memory. The memory stores a soft-start control program, which is called by the processor to implement the soft-start control method for the lamp module assembly provided in the above embodiment.

[0086] The following is for reference. Figure 5 It shows a structural schematic diagram of a soft-start control device suitable for implementing the lamp module of the embodiments of this application. Figure 5 The soft-start control device for the lamp module shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0087] like Figure 5 As shown, the soft-start 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 read-only memory (ROM) 102 or a program loaded from storage device 103 into random access memory (RAM) 104. RAM 104 also stores various programs and data required for the operation of the soft-start control device for the lamp module. The processing unit 101, ROM 102, and RAM 104 are interconnected via bus 105. Input / output (I / O) interface 106 is also connected to the bus. Typically, the following systems can be connected to I / O interface 106: input devices 107 including, for example, touchscreens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices 108 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 103 including, for example, magnetic tapes, hard disks, etc.; and communication devices 109. Communication device 109 allows the soft-start control unit of the lamp module to communicate wirelessly or wiredly with other devices to exchange data. Although the figures show soft-start control units 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.

[0088] 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.

[0089] The soft-start control device 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 device for lamp modules provided in this application are the same as those of the soft-start control method for lamp modules provided in the above embodiments, and will not be repeated here.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] Furthermore, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the soft-start control method for the lamp module as described above.

[0096] 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 for lamp modules provided in the above embodiments, and will not be repeated here.

[0097] The above description is merely a preferred 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 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, characterized in that, include: 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 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 fully charged.

2. The soft-start control circuit for the lamp module as described in claim 1, characterized in that, 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, characterized in that, 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, characterized in that, Both the first and second switching transistors are NPN transistors.

5. A soft-start control method for a lamp module, characterized in that, include: 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 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 fully charged.

6. The soft-start control method for the lamp module as described in claim 5, characterized in that, 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, characterized in that, 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 claim 5, characterized in that, The method further includes: The target time is determined based on the capacitance of the charging capacitor.

9. A soft-start control device for a lamp module, characterized in that, The soft-start control device includes a processor and a memory. The memory stores a soft-start control program, which the processor can call to implement the soft-start control method for the lamp module as described in any one of claims 5 to 8.

10. An auxiliary light, characterized in that, 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.

Images