Lighting module driving circuit and electric equipment
By combining a driver module, a sampling module, a monitoring module, and a controller, the problem of excessive driving current damaging high-power LED lights is solved, redundant protection is achieved, and the reliability of safe driving and overcurrent protection for LED lights is ensured.
Patent Information
- Application Number
- CN202520217265.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-11
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-02-11
AI Technical Summary
Existing technologies pose a risk of damaging high-power LEDs due to excessive driving current, and current current limiting methods cannot effectively solve this problem.
The circuit design employs a combination of a drive module, a sampling module, a monitoring module, and a controller. By generating sampling signals and setting a preset acquisition period, the drive current is monitored, and protective measures are immediately taken in case of overcurrent, including a clamping module to prevent excessive voltage from damaging the controller, thus achieving redundant protection.
It effectively reduces the risk of LED light damage caused by excessive drive current, realizes safe driving of high-power LED lights, and improves the reliability and fast response capability of overcurrent protection.
Smart Images
Figure CN223928493U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] Embodiments of the present application relate to the technical field of electronic circuit, in particular to a lighting module driving circuit and an electric device. BACKGROUND
[0002] LED lamp is a new type of light-emitting semiconductor device, mainly composed of N-type material and P-type material, and has unidirectional conductivity. Compared with the traditional tungsten filament bulb, LED lamp has long service life and energy saving, and is widely used.
[0003] At present, in the scheme of driving LED lamp, in order to prevent the driving current from being too large to damage the LED lamp, the driving current is usually limited, but this method cannot be applied to drive high-power LED lamp because the driving current is small. Therefore, in order to drive high-power LED lamp, a driving chip without limiting the driving current is selected, but this driving method is easy to cause the driving current to be too large to damage the LED lamp. CONTENT OF THE INVENTION
[0004] Embodiments of the present application provide a lighting module driving circuit and an electric device, which can drive high-power LED lamp and reduce the risk of damaging LED lamp due to excessive driving current.
[0005] In a first aspect, embodiments of the present application provide a lighting module driving circuit, comprising: a driving module, a sampling module, a monitoring module and a controller; the driving module is connected with the lighting module, the sampling module, the monitoring module and the controller respectively, and the driving module is configured to drive the lighting module to emit light and output the driving current of the lighting module to the sampling module and the monitoring module; the sampling module is configured to generate a sampling signal based on the driving current, wherein the controller collects the sampling signal at a preset collection period, and when the controller collects the sampling signal, the controller determines the size of the driving current based on the sampling signal; the monitoring module is configured to output a feedback signal in response to the driving current being greater than a first current threshold, wherein when the controller receives the feedback signal, the controller collects the sampling signal.
[0006] In one or more embodiments, the lighting module driving circuit further comprises a clamping module; the clamping module is connected with the sampling module and the controller respectively, and the clamping module is configured to clamp the voltage of the sampling signal to the first voltage threshold in response to the voltage of the sampling signal being greater than a first voltage threshold.
[0007] In one or more embodiments, the monitoring module comprises a pre-processing unit, a signal generating unit and a filtering unit; the pre-processing unit is connected with the driving module, the sampling module and the signal generating unit respectively, and is configured to divide and filter the voltage of the sampling signal and output a first voltage to the signal generating unit; the signal generating unit is configured to generate a first level signal in response to the first voltage being greater than a second voltage threshold, wherein the driving current is greater than the first current threshold when the first voltage is greater than the second voltage threshold; the filtering unit is connected with the signal generating unit and the controller respectively, and is configured to filter the first level signal and output the feedback signal to the controller.
[0008] In one or more embodiments, the driving module comprises a driving chip, a first capacitor and a second capacitor; a power pin of the driving chip inputs a second voltage, the first capacitor is connected between the power pin of the driving chip and the ground, the second capacitor is connected in parallel with the first capacitor, an output pin of the driving chip is connected with the lighting module, and a current output pin of the driving chip outputs the driving current.
[0009] In one or more embodiments, the sampling module comprises a first resistor; the first resistor is connected between the driving module and the ground.
[0010] In one or more embodiments, the clamping module comprises a first diode; an anode of the first diode is connected with the driving module, the sampling module and the controller respectively, a cathode of the first diode inputs a third voltage, and the sum of the third voltage and the conduction voltage drop of the first diode is the first voltage threshold.
[0011] In one or more embodiments, the pre-processing unit comprises a second resistor, a third resistor and a third capacitor; the second resistor and the third resistor are connected in series between the driving module and the ground, a connection point between the second resistor and the third resistor is connected with the first end of the third capacitor and the signal generating unit respectively, and the second end of the third capacitor is grounded.
[0012] In one or more embodiments, the signal generating unit comprises a first switch tube and a fourth resistor; a first end of the first switch tube is connected with the pre-processing unit, a second end of the first switch tube is grounded, a third end of the first switch tube is connected with the filtering unit and a first end of the fourth resistor respectively, and a second end of the fourth resistor inputs a third voltage.
[0013] In one or more embodiments, the filter unit comprises a fifth resistor and a fourth capacitor; the fifth resistor and the fourth capacitor are connected in series between the signal generation unit and the ground, and a connection point between the fifth resistor and the fourth capacitor is connected to the controller.
[0014] In a second aspect, the embodiments of the present application provide a lighting module, comprising a lighting module and a lighting module driving circuit as described above.
[0015] The beneficial effects of the present application are: the lighting module driving circuit of the embodiments of the present application comprises a driving module, a sampling module, a monitoring module and a controller. The driving module is connected to the lighting module, the sampling module, the monitoring module and the controller, respectively, and is configured to drive the lighting module to emit light and output a driving current of the lighting module to the sampling module and the monitoring module. On the one hand, the sampling module generates a sampling signal based on the driving current, wherein the controller collects the sampling signal at a preset collection period, and when the controller collects the sampling signal, the controller determines the size of the driving current based on the sampling signal. Thus, the controller can take appropriate overcurrent protection measures in time when the driving current is too large, so as to reduce the risk of damaging the LED lamp due to the driving current being too large. On the other hand, the monitoring module outputs a feedback signal in response to the driving current being greater than a first current threshold, wherein the controller collects the sampling signal when the controller receives the feedback signal. Thus, when overcurrent occurs, the controller collects the sampling signal immediately even if it is not the preset collection period of the controller, so as to achieve overcurrent protection as quickly as possible. In summary, the above process realizes redundant protection of overcurrent protection, so that when driving a high-power LED lamp, the controller can take appropriate overcurrent protection measures in time when the driving current is too large, so as to reduce the risk of damaging the LED lamp due to the driving current being too large. BRIEF DESCRIPTION OF DRAWINGS
[0016] One or more embodiments are illustrated by way of example in the drawings, which are not configured to limit the embodiments, and elements with the same reference numerals in the drawings represent similar elements.
[0017] Figure 1 is a schematic diagram of a component block diagram of the lighting module driving circuit provided by the embodiments of the present application Figure 1 ;
[0018] Figure 2 is a schematic diagram of a component block diagram of the lighting module driving circuit provided by the embodiments of the present application Figure 2 ;
[0019] Figure 3 is a schematic diagram of a component block diagram of the lighting module driving circuit provided by the embodiments of the present application Figure 3 ;
[0020] Figure 4 is a circuit structure diagram corresponding to the composition block diagram shown in Figure 3 . DETAILED DESCRIPTION
[0021] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and in detail below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain and not limit the present application.
[0022] It should be noted that when an element is described as "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements can be present between them.
[0023] In addition, the technical features involved in each of the embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.
[0024] Please refer to Figure 1 , Figure 1 is a schematic diagram of a composition block diagram of the lighting module driving circuit provided by the embodiments of the present application. As Figure 1 shown, the lighting module driving circuit 100 includes a driving module, a sampling module, a monitoring module and a controller.
[0025] Among them, the driving module 10 is connected with the lighting module 200, the sampling module 20, the monitoring module 30 and the controller 40 respectively. That is, the first end of the driving module 10 is connected with the first end of the sampling module 20, the first end of the monitoring module 30 and the first end of the controller 40 respectively, and the second end of the driving module 10 is connected with the lighting module 200. The second end of the monitoring module 30 is connected with the second end of the controller 40.
[0026] Specifically, the driving module 10 is configured to drive the lighting module 200 to emit light and output the driving current of the lighting module 200 to the sampling module 20 and the monitoring module 30. The sampling module 20 is configured to generate a sampling signal based on the driving current, wherein the controller 40 collects the sampling signal at a preset collection period, and when the controller 40 collects the sampling signal, the controller 40 determines the size of the driving current based on the sampling signal. The preset collection period is a time interval set in advance, and within this time interval, the controller 40 periodically acquires the sampling signal. The monitoring module 30 is configured to output a feedback signal in response to the driving current being greater than a first current threshold, wherein when the controller 40 receives the feedback signal, the controller 40 collects the sampling signal. The first current threshold is a pre-set current threshold, which can be set based on the actual application scenario, and the embodiments of the present application do not make specific limitations.
[0027] In summary, on the one hand, the sampling module 20 generates the sampling signal based on the driving current, and the controller 40 collects the sampling signal at the preset collection period, and when the controller 40 collects the sampling signal, the controller 40 determines the size of the driving current based on the sampling signal. Thus, the controller 40 can take corresponding overcurrent protection measures in time when the driving current is too large, so as to reduce the risk of damaging the LED lamp due to the driving current being too large. On the other hand, the monitoring module 30 outputs the feedback signal in response to the driving current being greater than the first current threshold, and when the controller 40 receives the feedback signal, the controller 40 immediately collects the sampling signal. Thus, when overcurrent occurs, even if the preset collection period of the controller 40 has not arrived, the controller 40 still collects the sampling signal immediately to achieve overcurrent protection as soon as possible. In summary, the above process realizes redundant protection of overcurrent protection, so that when driving a high-power LED lamp, the controller 40 can take corresponding overcurrent protection measures in time when the driving current is too large, so as to reduce the risk of damaging the LED lamp due to the driving current being too large.
[0028] In some embodiments, as shown in Figure 2 The lighting module driving circuit 100 further includes a clamping module 50. The clamping module 50 is connected with the sampling module 20 and the controller 40, respectively.
[0029] The clamping module 50 is configured to clamp the voltage of the sampling signal to the first voltage threshold in response to the voltage of the sampling signal being greater than the first voltage threshold. Thus, it can be prevented that the controller 40 is damaged due to the voltage of the sampling signal being too large.
[0030] In some embodiments, as shown in Figure 3 The monitoring module 30 includes a preprocessing unit 31, a signal generating unit 32 and a filtering unit. The preprocessing unit 31 is connected with the driving module 10, the sampling module 20 and the signal generating unit 32, respectively.
[0031] Specifically, the preprocessing unit 31 is configured to divide and filter the voltage of the sampling signal, and output a first voltage to the signal generating unit 32. The signal generating unit 32 is configured to generate a first level signal in response to the first voltage being greater than a second voltage threshold, wherein when the first voltage is greater than the second voltage threshold, the driving current is greater than the first current threshold. The filtering unit 33 is connected with the signal generating unit 32 and the controller 40, respectively, and the filtering unit 33 is configured to filter the first level signal and output a feedback signal to the controller 40. In this way, a voltage suitable for input to the controller 40 can be output to prevent the controller 40 from being damaged due to the input voltage being too large, and noise is filtered out to improve the quality of the signal, which is conducive to improving the accuracy and reliability of the controller 40 in judging whether the driving current is too large.
[0032] Please refer to Figure 4 ,Figure 4 An exemplary circuit structure corresponding to the block diagram shown is illustrated in Figure 3 FIG. 1. As shown, the driving module 10 includes a driving chip U1, a first capacitor C1, and a second capacitor C2. Figure 4
[0033] The power pin VS of the driving chip U1 inputs the second voltage V2. The first capacitor C1 is connected between the power pin VS of the driving chip U1 and the ground GND. The second capacitor C2 is connected in parallel with the first capacitor C1. The output pin OUT of the driving chip U1 is connected with the lighting module 200. The current output pin IS of the driving chip U1 outputs a driving current. The first capacitor C1 is used for energy storage and low frequency wave filtering. The second capacitor C2 is used for high frequency wave filtering.
[0034] In some embodiments, the driving chip U1 is a high-side driving chip, such as a BTS7200, a BTS7030, or a BTS7004. It can be understood that, since the driving chip U1 has different types, the specific pin definitions can be different when different types of driving chip U1 are used, but the functions and signal definitions are the same. Therefore, if different types of driving chip U1 are used, it is only necessary to set up in a similar manner as the above-described embodiments, which is within the scope of understanding of those skilled in the art, and will not be described here in detail
[0035] In some embodiments, the sampling module 20 includes a first resistor R1. The first resistor R1 is connected between the driving module 10 and the ground GND.
[0036] The driving current output by the current output pin IS of the driving chip U1 flows through the first resistor R1, and the voltage generated on the first resistor R1 is the sampling signal.
[0037] In some embodiments, the clamping module 50 includes a first diode D1. The anode of the first diode D1 is connected with the driving module 10, the sampling module 20, and the controller 40, respectively.
[0038] The cathode of the first diode D1 inputs a third voltage V3. The sum of the third voltage V3 and the conduction voltage drop of the first diode D1 is a first voltage threshold. When the voltage of the sampling signal is greater than the sum of the third voltage V3 and the conduction voltage drop of the first diode D1, the voltage of the sampling signal is clamped to the sum of the third voltage V3 and the conduction voltage drop of the first diode D1, i.e., the voltage of the sampling signal is clamped to the first voltage threshold.
[0039] In some embodiments, the preprocessing unit 31 includes a second resistor R2, a third resistor R3, and a third capacitor C3.
[0040] The second resistor R2 and the third resistor R3 are connected in series between the driving module 10 and the ground GND, and the connection point between the second resistor R2 and the third resistor R3 is connected to the first end of the third capacitor C3 and the signal generation unit 32 respectively, and the second end of the third capacitor C3 is connected to the ground GND. The second resistor R2 and the third resistor R3 are used for voltage division, and the third capacitor C3 is used for filtering.
[0041] In some embodiments, the signal generation unit 32 includes a first switch Q1 and a fourth resistor R4.
[0042] The first end of the first switch Q1 is connected to the preprocessing unit 31, the second end of the first switch Q1 is connected to the ground GND, the third end of the first switch Q1 is connected to the filtering unit 33 and the first end of the fourth resistor R4 respectively, and the second end of the fourth resistor R4 inputs the third voltage V3.
[0043] In this embodiment, the first switch Q1 is taken as an example of an NPN type triode. The base of the NPN type triode is the first end of the first switch Q1, the emitter of the NPN type triode is the second end of the first switch Q1, and the collector of the NPN type triode is the third end of the first switch Q1.
[0044] In addition, the first switch Q1 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate-commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field-effect transistor (JFET) device, a MOS-controlled thyristor (MCT) device, etc. In addition, Figure 4 The first switch Q1 shown in the figure can be implemented as a plurality of switches connected in parallel.
[0045] In some embodiments, the filtering unit 33 includes a fifth resistor R5 and a fourth capacitor C4.
[0046] The fifth resistor R5 and the fourth capacitor C4 are connected in series between the signal generation unit 32 and the ground GND, and the connection point between the fifth resistor R5 and the fourth capacitor C4 is connected to the controller 40. The fifth resistor R5 and the fourth capacitor C4 are used for RC filtering.
[0047] In some embodiments, the lighting module 200 comprises a LED lamp LD1. It can be immediately understood that the embodiment takes the driving of one LED lamp as an example, while in other embodiments, the same driving chip U1 can also drive multiple LED lamps at the same time, in which case, the driving chip U1 can be controlled to output the driving current of the specified LED lamp through the current output pin IS of the driving chip U1. For example, in some implementations, the driving chip U1 is used to drive a first LED lamp and a second LED lamp, and the driving current of the first LED lamp needs to be detected, the driving chip U1 outputs the driving current of the first LED lamp through the current output pin IS.
[0048] The working principle of the above-mentioned process will be described below. Figure 4
[0049] On the one hand, the driving current flows through the first resistor R1 to generate a sampling signal. The controller 40 collects the sampling signal at a preset collection period, and when the controller 40 collects the sampling signal, the controller 40 determines the size of the driving current based on the sampling signal. Thus, the controller 40 can take corresponding overcurrent protection measures in time when the driving current is too large, so as to reduce the risk of damaging the LED lamp due to the driving current being too large.
[0050] On the other hand, the voltage of the sampling signal is divided and filtered to be a first voltage, and when the voltage of the sampling signal is greater than a first voltage threshold (corresponding to the driving current being greater than a first current threshold), the first voltage is greater than a second voltage threshold. The first switch tube Q1 is turned on, and the collector of the first switch tube Q1 generates a first level signal (at this time, since the collector of the first switch tube Q1 is grounded GND, the first level signal is a low level signal), and the first level signal is filtered to be a feedback signal (still a low level signal). The feedback signal is input to the controller 40, and no matter whether it is the preset collection period at this time, the controller 40 collects the sampling signal immediately. Thus, when overcurrent occurs, even if it is not the preset collection period of the controller 40, the controller 40 also collects the sampling signal immediately to achieve overcurrent protection as soon as possible.
[0051] In summary, the above-mentioned process realizes the redundant protection of overcurrent protection, so that when driving a high-power LED lamp, the controller 40 can take corresponding overcurrent protection measures in time when the driving current is too large, so as to reduce the risk of damaging the LED lamp due to the driving current being too large.
[0052] The embodiment of the present application also provides a power consumption device. The power consumption device comprises a lighting module and the lighting module driving circuit 100 in any embodiment of the present application.
[0053] In some embodiments, the lighting module is a LED lamp. In a specific embodiment, the power consumption device is a vehicle, and the LED lamp is a tail lamp of the vehicle.
[0054] The above merely describes the embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made by using the contents of the present application specification and drawings, is also included in the patent protection scope of the present application.
[0055] The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; the technical features of the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. Those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A lighting module driving circuit, characterized in that, include: Drive module, sampling module, monitoring module and controller; The driving module is connected to the lighting module, the sampling module, the monitoring module and the controller respectively. The driving module is configured to drive the lighting module to emit light and output the driving current of the lighting module to the sampling module and the monitoring module. The sampling module is configured to generate a sampling signal based on the drive current, wherein the controller acquires the sampling signal at a preset acquisition period, and when the controller acquires the sampling signal, the controller determines the magnitude of the drive current based on the sampling signal; The monitoring module is configured to output a feedback signal in response to the drive current being greater than a first current threshold, wherein the controller acquires the sampling signal when the controller receives the feedback signal.
2. The lighting module driving circuit according to claim 1, characterized in that, The lighting module drive circuit also includes a clamping module; The clamping module is connected to the sampling module and the controller respectively. The clamping module is configured to clamp the voltage of the sampling signal to the first voltage threshold in response to the voltage of the sampling signal being greater than the first voltage threshold.
3. The lighting module driving circuit according to claim 1 or 2, characterized in that, The monitoring module includes a preprocessing unit, a signal generation unit, and a filtering unit; The preprocessing unit is connected to the driving module, the sampling module and the signal generation unit respectively. The preprocessing unit is configured to divide and filter the voltage of the sampled signal and output a first voltage to the signal generation unit. The signal generation unit is configured to generate a first level signal in response to the first voltage being greater than a second voltage threshold, wherein the driving current is greater than the first current threshold when the first voltage is greater than the second voltage threshold. The filtering unit is connected to the signal generation unit and the controller respectively. The filtering unit is configured to filter the first level signal and output the feedback signal to the controller.
4. The lighting module driving circuit according to claim 1, characterized in that, The driving module includes a driving chip, a first capacitor, and a second capacitor; The power supply pin of the driver chip receives a second voltage, the first capacitor is connected between the power supply pin of the driver chip and ground, the second capacitor is connected in parallel with the first capacitor, the output pin of the driver chip is connected to the lighting module, and the current output pin of the driver chip outputs the driving current.
5. The lighting module driving circuit according to claim 1, characterized in that, The sampling module includes a first resistor; The first resistor is connected between the drive module and ground.
6. The lighting module driving circuit according to claim 2, characterized in that, The clamping module includes a first diode; The anode of the first diode is connected to the driving module, the sampling module and the controller respectively, and the cathode of the first diode is input with a third voltage, wherein the sum of the third voltage and the forward voltage drop of the first diode is the first voltage threshold.
7. The lighting module driving circuit according to claim 3, characterized in that, The preprocessing unit includes a second resistor, a third resistor, and a third capacitor; The second resistor and the third resistor are connected in series between the driving module and ground. The connection point between the second resistor and the third resistor is connected to the first terminal of the third capacitor and the signal generation unit, respectively. The second terminal of the third capacitor is grounded.
8. The lighting module driving circuit according to claim 3, characterized in that, The signal generation unit includes a first switching transistor and a fourth resistor; The first terminal of the first switching transistor is connected to the preprocessing unit, the second terminal of the first switching transistor is grounded, the third terminal of the first switching transistor is connected to the filtering unit and the first terminal of the fourth resistor, and the second terminal of the fourth resistor is input with a third voltage.
9. The lighting module driving circuit according to claim 3, characterized in that, The filtering unit includes a fifth resistor and a fourth capacitor; The fifth resistor and the fourth capacitor are connected in series between the signal generation unit and ground, and the connection point between the fifth resistor and the fourth capacitor is connected to the controller.
10. An electrical appliance, characterized in that, It includes a lighting module and a lighting module driving circuit as described in any one of claims 1-9.