Pre-start control circuit, method and device of lamp module and booster lamp

Abstract

This application discloses a pre-start control circuit, method, device, and auxiliary lamp for a lamp module. The application relates to the field of auxiliary lamp control technology. The pre-start control circuit includes: a drive voltage supply circuit connected to the drive switch of the lamp module, used to provide drive voltage to the drive switch; a current sampling circuit connected to the drive switch, used to collect the operating current of the drive switch; and a main control module connected to both the drive voltage supply circuit and the current sampling circuit, used to gradually output control signals after receiving the lamp module's turn-on signal, 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 a target current; the target current is less than or equal to the maximum current that the drive switch can withstand. This application can improve 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 pre-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 pre-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 pre-start control circuit for a lamp module, comprising:

[0006] 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.

[0007] A current sampling circuit is connected to the driving switch transistor and is used to collect the operating current of the driving switch transistor.

[0008] 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.

[0009] In one embodiment, the drive voltage providing circuit includes a first resistor, a second resistor, and a first capacitor;

[0010] 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.

[0011] In one embodiment, the current sampling circuit includes a sampling resistor;

[0012] 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.

[0013] In one embodiment, the sampling circuit further includes a filtering circuit;

[0014] 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.

[0015] In one embodiment, the filter circuit includes a third resistor and a second capacitor;

[0016] 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.

[0017] To achieve the above objectives, this application also provides a pre-start control method for a lamp module, comprising:

[0018] 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;

[0019] Obtain the current operating current of the driving switch transistor of the lamp module;

[0020] 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.

[0021] Wherein, the target current is less than or equal to the maximum current that the driving switch can withstand.

[0022] In one embodiment, the method further includes:

[0023] Obtain the ambient temperature;

[0024] The target current is determined based on the power of the driving switch and the ambient temperature.

[0025] In one embodiment, the step of gradually increasing the driving voltage supplied to the driving switch of the lamp module includes:

[0026] Gradually increase the duty cycle of the control signal to increase the driving voltage.

[0027] In one embodiment, the step of gradually increasing the duty cycle of the control signal includes:

[0028] The duty cycle increment is determined based on the capacitance of the charging capacitor in the lamp module.

[0029] Based on the increase in duty cycle, the duty cycle of the control signal is gradually increased.

[0030] To achieve the above objectives, this application also proposes a pre-start control device for a lamp module assembly. The pre-start control device includes a processor and a memory. The memory stores a pre-start control program, which is called by the processor to implement the pre-start control method for the lamp module assembly as described above.

[0031] 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.

[0032] 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.

[0033] This application provides a pre-start control circuit for a lamp module, including a drive voltage supply circuit connected to the drive switch of the lamp module for providing drive voltage to the drive switch; a current sampling circuit connected to the drive switch for collecting the operating current of the drive switch; and a main control module connected to both the drive voltage supply circuit and the current sampling circuit for gradually outputting control signals after receiving the lamp module's turn-on signal, 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.

[0034] In summary, during the lamp module activation process, this application utilizes the control signal output by the main control module to gradually increase the drive voltage supplied by the drive voltage supply circuit to the drive switch transistor. This gradually increases the operating current of the drive switch transistor until the current sampling circuit detects that the operating current of the drive switch transistor has reached the target current, at which point the increase in drive voltage stops. Because the operating current of the drive switch transistor used to control the lamp module gradually increases within its maximum withstand current range during the activation process, rather than increasing instantaneously, the generation of inrush current is avoided. This ensures that the drive switch transistor's control of the lamp module is effective, improving the reliability of lamp module control. Attached Figure Description

[0035] 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.

[0036] Figure 1 A schematic diagram of a module structure of the pre-start control circuit of the lamp module provided in the embodiments of this application;

[0037] Figure 2 A schematic diagram of the pre-start control circuit of the lamp module provided in the embodiments of this application;

[0038] Figure 3 This is a schematic diagram of another module structure of the pre-start control circuit of the lamp module provided in the embodiments of this application;

[0039] Figure 4 Another circuit structure diagram of the pre-start control circuit of the lamp module provided in the embodiments of this application;

[0040] Figure 5 A flowchart illustrating the pre-start control method for a lamp module provided in this application embodiment;

[0041] Figure 6 A schematic diagram illustrating the implementation principle of the pre-start control method for the lamp module provided in this application embodiment;

[0042] Figure 7 A schematic diagram of the hardware operating environment of the pre-start control device for the lamp module provided in this application embodiment.

[0043] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0044] Explanation of icon numbers:

[0045] 10. Drive voltage supply circuit; 20. Current sampling circuit; 30. Main control module; 21. Filtering circuit; Q1. Drive switching transistor; R1~R3. Resistors; C1~C2. Capacitors; Rx. Sampling resistor; Ca. Charging capacitor; D1. Diode; GND. Ground; VDD. Power supply;

[0046] 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

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] Based on this, this application proposes a pre-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 Ca is a charging capacitor). The pre-start control circuit may include a drive voltage supply circuit 10, a current sampling circuit 20, and a main control module 30.

[0053] The driving voltage supply circuit 10 is connected to the driving switch Q1 of the lamp module, the current sampling circuit 20 is connected to the driving switch Q1, and the main control module 30 is connected to the driving voltage supply circuit 10 and the current sampling circuit 20 respectively.

[0054] The drive voltage supply circuit 10 is used to provide drive voltage to the drive switch Q1;

[0055] Current sampling circuit 20 is used to collect the operating current of driving switch Q1;

[0056] 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 10 gradually increases the drive voltage according to the control signal until the working current of the drive switch Q1 reaches the target current.

[0057] The target current is less than or equal to the maximum current that the drive switch Q1 can withstand.

[0058] It should be noted that the driving switch Q1 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 Q1 can be used to control the switching on and off of the lamp module. The operating current of the driving switch Q1 refers to the current flowing through the driving switch Q1. The driving voltage and the operating current of the driving switch Q1 are positively correlated; that is, the larger the driving voltage, the larger the operating current of the driving switch Q1; the smaller the driving voltage, the smaller the operating current of the driving switch Q1. The lamp module's turn-on signal is used to indicate that the lamp module needs to be turned on.

[0059] 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.

[0060] This embodiment provides a pre-start control circuit for a lamp module, including a drive voltage supply circuit 10 connected to the drive switch Q1 of the lamp module, used to provide drive voltage to the drive switch Q1; a current sampling circuit 20 connected to the drive switch Q1, used to collect the operating current of the drive switch Q1; and a main control module 30 connected to the drive voltage supply circuit 10 and the current sampling circuit 20, used to gradually output control signals after receiving the lamp module's turn-on signal, so that the drive voltage supply circuit 10 gradually increases the drive voltage according to the control signals until the operating current of the drive switch Q1 reaches the target current; the target current is less than or equal to the maximum current that the drive switch Q1 can withstand.

[0061] 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 10 to the driving switch Q1 during the lamp module activation process. This gradually increases the operating current of the driving switch Q1 until the current sampling circuit 20 detects that the operating current of the driving switch Q1 has reached the target current, at which point the increase in driving voltage stops. Because the operating current of the driving switch Q1, 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 Q1 can effectively control the lamp module, improving the reliability of lamp module control.

[0062] In one feasible implementation, please refer to Figure 2 The driving voltage supply circuit 10 may include a first resistor R1, a second resistor R2, and a first capacitor C1;

[0063] The first end of the first resistor R1 is connected to the signal output terminal of the main control module 30. The second end of the first resistor R1 is connected to the first end of the driving switch Q1 and the first end of the second resistor R2. The first end of the second resistor R2 is also connected to the first end of the first capacitor C1. The second end of the second resistor R2 and the second end of the first capacitor C1 are grounded to GND.

[0064] It is understandable that the first resistor R1, the second resistor R2, and the first capacitor C1 form an integrating circuit. This circuit can obtain the driving voltage by integrating the control signal output by the main control module 30.

[0065] In one feasible implementation, please refer to Figure 2 The current sampling circuit 20 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 Q1, respectively, and the second end of the sampling resistor Rx is grounded to GND, which is used to collect the operating current of the driving switch Q1.

[0066] It should be noted that, in addition to using the sampling resistor Rx to collect the operating current of the driving switch Q1, 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 Q1. This embodiment does not specifically limit this.

[0067] Furthermore, in another feasible implementation, please refer to Figure 3 The current sampling circuit 20 may also include a filter circuit 21; the filter circuit 21 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 working current.

[0068] It should be noted that the filter circuit 21 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. When the filter circuit 21 is an RC filter circuit, please refer to... Figure 4 It may include a third resistor R3 and a second capacitor C2; the first end of the second capacitor C2 is connected to the signal input terminal of the main control module 30 and the first end of the third resistor R3 respectively, the second end of the second capacitor C2 is grounded to GND, and the second end of the third resistor R3 is connected to the first end of the sampling resistor Rx.

[0069] In this embodiment, a filter circuit 21 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.

[0070] In addition, this application embodiment also provides a pre-start control method for a lamp module, please refer to... Figure 5 The pre-start control method for the lamp module may include steps S10 to S30:

[0071] Step S10: Upon receiving the turn-on signal of the lamp module, provide the initial drive voltage to the drive switch of the lamp module;

[0072] 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 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.

[0073] 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.

[0074] Step S20: Obtain the current operating current of the driving switch transistor of the lamp module;

[0075] 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.

[0076] Step S30: 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.

[0077] The target current is less than or equal to the maximum current that the driving switch can withstand.

[0078] 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 to S02:

[0079] Step S01: Obtain the ambient temperature;

[0080] Step S02: Determine the target current based on the power of the driving switch and the ambient temperature.

[0081] 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.

[0082] 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.

[0083] In one feasible implementation, the step of gradually increasing the driving voltage supplied to the driving switch of the lamp module may include step S31:

[0084] Step S31: Gradually increase the duty cycle of the control signal to increase the driving voltage.

[0085] 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) to the total time of the entire cycle. 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.

[0086] 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 to S312). This embodiment does not make specific limitations on this.

[0087] Step S311: Determine the duty cycle increase based on the capacitance of the charging capacitor in the lamp module;

[0088] It should be noted that the increase in duty cycle 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.

[0089] 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.

[0090] Step S312: Based on the increase in duty cycle, gradually increase the duty cycle of the control signal.

[0091] 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.

[0092] 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.

[0093] For example, to help understand the principle that the operating current of the driving switch can be gradually increased by gradually increasing the duty cycle of the control signal, please refer to... Figure 6 .Depend on Figure 6 As can be seen, 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 diagram), thus the driving voltage provided by the driving voltage supply circuit also gradually increases. Based on this, the operating current of the driving switch gradually rises 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.

[0094] 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.

[0095] Furthermore, this application embodiment also provides a pre-start control device for a lamp module assembly. The pre-start control device may include a processor and a memory. The memory stores a pre-start control program, which is called by the processor to implement the pre-start control method for the lamp module assembly provided in the above embodiment.

[0096] The following is for reference. Figure 7 It shows a schematic diagram of a pre-start control device suitable for implementing the lamp module of the present application. Figure 7 The pre-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.

[0097] like Figure 7As shown, the pre-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. The RAM 104 also stores various programs and data required for the operation of the pre-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, touch screens, 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 pre-start control device of the lamp module to communicate wirelessly or wiredly with other devices to exchange data. Although the figures show pre-start 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.

[0098] 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.

[0099] The pre-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 pre-start control device for lamp modules provided in this application are the same as the beneficial effects of the pre-start control method for lamp modules provided in the above embodiments, and will not be repeated here.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] Furthermore, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the pre-start control method for the lamp module as described above.

[0106] 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 pre-start control method of lamp module provided in the above embodiments, and will not be repeated here.

[0107] 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 pre-start control circuit for a lamp module, characterized in that, include: 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.

2. The pre-start control circuit for the lamp module as described in claim 1, characterized in that, 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.

3. The pre-start control circuit for the lamp module as described in claim 1 or 2, characterized in that, 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.

4. The pre-start control circuit for the lamp module as described in claim 3, characterized in that, 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.

5. The pre-start control circuit for the lamp module as described in claim 4, characterized in that, 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.

6. A pre-start control method for a lamp module, characterized in that, include: Upon receiving the turn-on signal of the lamp module, an initial drive voltage is provided to the drive switch 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.

7. The pre-start control method for the lamp module as described in claim 6, characterized in that, 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.

8. The pre-start control method for the lamp module as described in claim 6, characterized in that, 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.

9. The pre-start control method for the lamp module as described in claim 8, characterized in that, 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.

10. A pre-start control device for a lamp module assembly, characterized in that, The pre-start control device includes a processor and a memory. The memory stores a pre-start control program, which the processor can call to implement the pre-start control method for the lamp module as described in any one of claims 6 to 9.

11. An auxiliary light, characterized in that, 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 1 to 5, wherein the drive switch transistor is connected to the lamp module and the pre-start control circuit respectively.

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