LED module capable of avoiding uneven brightness of LEDs and control circuit
By setting the LED components in parallel and connecting resistors on each LED lamp, combining filter capacitors and NTC resistors, the control circuit is used to achieve LED brightness uniformity, which solves the problems of uneven LED brightness and high cost in the prior art, and reduces single The cost of series circuit.
Patent Information
- Application Number
- CN202420184644.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-25
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-01-25
AI Technical Summary
The uneven brightness of LEDs in existing automotive integrated lamps leads to high cost problems, especially the single series circuit requires too many driving channels, which is not practical.
Design an LED module, and set up LED components in parallel. Each LED component is connected in series, and a resistor is connected in series on each LED lamp. Combining the filter capacitor and NTC resistor, the control circuit is adopted, including the power input module, The signal input module, power management module, constant current module and MCU module control the work of the LED module through the MCU module to achieve uniform LED brightness.
The uniformity of LED brightness is achieved, the cost is reduced, and the market demand is suitable, and the electromagnetic compatibility and temperature monitoring capabilities are improved through filter capacitors and NTC resistors.
Smart Images
Figure CN222263082U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of LED control, in particular to an LED module and a control circuit for avoiding uneven brightness of LEDs. Background Art
[0002] At present, integrated lamps are becoming increasingly popular in the automotive market. As this type of lamp is larger in size, a large number of LEDs are used to achieve uniformity requirements. Considering the cost issue, most of them will choose to use a series-parallel LED circuit connection method.
[0003] The existing series-parallel circuit only connects LEDs into a mesh form. When used in large-sized integrated lamps, various factors such as the length of the wiring will cause uneven current distribution of each LED, resulting in inconsistent brightness. If the LED brightness needs to be consistent, a single series circuit needs to be used. However, due to the large number of LED particles, too many driving channels are required, so the cost is very high and this solution is not practical.
[0004] The above problems need to be solved urgently. Utility Model Content
[0005] The utility model aims to provide an LED module and a control circuit for avoiding uneven brightness of LEDs.
[0006] In order to solve the above technical problems, the utility model provides an LED module for avoiding uneven brightness of LEDs, comprising:
[0007] A plurality of LED assemblies arranged in parallel;
[0008] Each of the LED components is connected in series with a plurality of LED lamps;
[0009] There is a resistor connected in series above each LED light.
[0010] Furthermore, each of the LED lamps is connected in parallel with a filter capacitor.
[0011] Furthermore, the LED module also includes a light board;
[0012] The plurality of LED components are fixedly arranged on the lamp board.
[0013] Furthermore, the LED module also includes an NTC resistor.
[0014] The utility model also provides a control circuit for controlling the LED module to avoid uneven brightness of LEDs as described above, comprising:
[0015] Power input module, signal input module, power management module, constant current module, SBC module, and MCU module;
[0016] The power input module is electrically connected to the power management module;
[0017] The power management module is suitable for supplying power to the constant current module and the SBC module;
[0018] The SBC module is electrically connected to the main control module and is suitable for supplying power to the MCU module;
[0019] The SBC module is also electrically connected to the signal input module and is adapted to transmit the received lamp signal to the MCU module;
[0020] The MCU module is electrically connected to the constant current module and the LED module, and the MCU module is suitable for controlling the constant current module to supply power to the LED module, and at the same time, controlling the operation of the LED module according to the received lamp signal.
[0021] Furthermore, the power management module includes a filter unit, an anti-reverse MOS tube Q6, a switch MOS tube Q7 and an ideal diode controller;
[0022] The control terminal DGATE pin of the ideal diode controller is electrically connected to the gate of the anti-reverse MOS tube Q6;
[0023] The control terminal HGATE pin of the ideal diode controller is electrically connected to the gate of the switch MOS tube Q7;
[0024] The enable terminal EN_UVLO pin of the ideal diode controller is electrically connected to the MCU module;
[0025] The power input terminal Power of the power input module outputs the normally-on power supply terminal SBC_POWER through the anti-reverse MOS tube Q6 and then outputs the controllable power supply terminal POWER_IN after passing through the switch MOS tube Q7;
[0026] The MCU module is suitable for sending a control signal to the enable terminal EN_UVLO of the ideal diode controller, so as to control the on-off of the switch MOS tube Q7, and further control the on-off of the controllable power supply terminal POWER_IN;
[0027] The power supply terminal POWER_IN is suitable for supplying power to the constant current module;
[0028] The filter unit is arranged between the power input terminal Power and the anti-reverse MOS tube Q6.
[0029] Further, the filtering unit includes a capacitor C49, a capacitor C62 and a resistor R49;
[0030] The capacitor C49, the capacitor C62 and the resistor R49 are sequentially connected in parallel between the power input terminal Power and GND.
[0031] Furthermore, the constant current module includes a BOOST constant voltage unit and a BUCK constant current unit;
[0032] The power management module sequentially cooperates with the BOOST constant voltage unit and the BUCK constant current unit to supply power to the LED module.
[0033] Furthermore, the control circuit also includes a signal acquisition module;
[0034] The signal acquisition module is electrically connected to the MCU module.
[0035] Furthermore, the signal acquisition module includes a voltage detection unit, a temperature acquisition unit and an LED current output adjustment unit.
[0036] The beneficial effect of the utility model is that the utility model provides an LED module and control circuit for avoiding uneven brightness of LEDs, wherein the LED module includes: a plurality of LED components arranged in parallel; a plurality of LED lamps are connected in series on each of the LED components; and a resistor is connected in series above each LED lamp. By connecting a small resistance resistor in series with each LED lamp, the impedance difference of the LED line is avoided and after the LED lamp with the lowest conduction voltage clamps the voltage, the phenomenon of inconsistent working current of other LED lamps with higher conduction voltage is avoided, so that the working current of each LED lamp tends to be average, the brightness is uniform, and the cost is lower than that of a single series circuit, which is more suitable for market demand. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0038] Figure 1 is a circuit diagram of the LED module provided in this embodiment.
[0039] Figure 2 It is a principle block diagram of the control circuit provided in this embodiment.
[0040] Figure 3 is a circuit diagram of the power management module provided in this embodiment.
[0041] Figure 4 is a circuit diagram of the SBC module provided in this embodiment.
[0042] Figure 5 is a circuit diagram of the BOOST constant voltage unit provided in this embodiment.
[0043] Figure 6is a circuit diagram of the BUCK constant current unit provided in this embodiment.
[0044] Figure 7 is a circuit diagram of the signal acquisition module provided in this embodiment.
[0045] Figure 8 is a circuit diagram of the MCU module provided in this embodiment. DETAILED DESCRIPTION
[0046] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.
[0047] Example 1
[0048] See also Figure 1 This embodiment provides an LED module for avoiding uneven brightness of LEDs, including: multiple LED components arranged in parallel; multiple LED lamps connected in series on each LED component; and a resistor connected in series above each LED lamp. By connecting a small resistance resistor in series with each LED lamp, the impedance difference of the LED line is avoided, and after the LED lamp with the lowest on-voltage is clamped, the other LED lamps with higher on-voltages will have inconsistent working currents, so that the working currents of each LED lamp tend to be average, the brightness is uniform, and the cost is lower than that of a single series circuit, which is more suitable for market demand.
[0049] In this embodiment, each LED lamp is connected in parallel with a filter capacitor, so that each LED lamp is filtered, which is helpful for electromagnetic compatibility testing.
[0050] In this embodiment, the LED module further comprises a lamp board; a plurality of the LED components are fixedly arranged on the lamp board. The LED module further comprises an NTC resistor. By arranging the NTC resistor on the lamp board, the temperature of the lamp board is monitored to protect the lamp board from damage caused by overheating.
[0051] See also Figure 2The present embodiment also provides a control circuit for controlling an LED module for avoiding uneven brightness of LEDs as described above, comprising: a power input module, a signal input module, a power management module, a constant current module, an SBC module, and an MCU module; the power input module is electrically connected to the power management module; the power management module is suitable for supplying power to the constant current module and the SBC module; the SBC module is electrically connected to the main control module and is suitable for supplying power to the MCU module; the SBC module is also electrically connected to the signal input module and is suitable for transmitting the received lamp signal to the MCU module; the MCU module is electrically connected to the constant current module and the LED module, and the MCU module is suitable for controlling the constant current module to supply power to the LED module, and at the same time, controlling the operation of the LED module according to the received lamp signal.
[0052] like Figure 3 As shown, in this embodiment, the power management module includes a filtering unit, an anti-reverse MOS tube Q6, a switch MOS tube Q7 and an ideal diode controller; the control end DGATE pin of the ideal diode controller is electrically connected to the gate of the anti-reverse MOS tube Q6; the control end HGATE pin of the ideal diode controller is electrically connected to the gate of the switch MOS tube Q7; the enable end EN_UVLO pin of the ideal diode controller is electrically connected to the MCU module; the power input end Power of the power input module outputs the normally-on power supply end SBC_POWER through the anti-reverse MOS tube Q6 and then outputs the controllable power supply end POWER_IN after passing through the switch MOS tube Q7; the MCU module is suitable for sending a control signal to the enable end EN_UVLO of the ideal diode controller, thereby controlling the on and off of the switch MOS tube Q7, and then controlling the on and off of the controllable power supply end POWER_IN; the power supply end POWER_IN is suitable for supplying power to the constant current module; the filtering unit is arranged between the power input end Power and the anti-reverse MOS tube Q6.
[0053] It should be noted that the filtering unit includes a capacitor C49, a capacitor C62 and a resistor R49; the capacitor C49, the capacitor C62 and the resistor R49 are sequentially connected in parallel between the power input terminal Power and GND.
[0054] See also Figure 4 The chip model of the SBC module is NXP's UJA1169 series, which integrates CAN and LDO. CAN transmits and feeds back the vehicle body signal and the lamp signal to meet the user's lighting needs, and LDO converts POWER electricity into 5V electricity for MCU operation.
[0055] In this embodiment, the constant current module includes a BOOST constant voltage unit and a BUCK constant current unit; the power management module sequentially cooperates with the BOOST constant voltage unit and the BUCK constant current unit to supply power to the LED module.
[0056] See also Figure 5 The BOOST constant voltage unit uses TI's TPS92 series, which can output up to 65V. It is a dual-channel constant current chip that provides a stable BOOST constant voltage power supply for the circuit and drives the BUCK chip. Pin 1 is the power input pin, which is input to the internal LDO of the chip. Pin 31 is the internal LDO converted 5V electrical output. Pins 5, 6, 7, and 8 are the chip select line, clock line, output, and input of SPI, respectively, and communicate with the microcontroller through SPI interaction. Pins 19 and 22 are used by the chip to output the high and low levels of the main frequency switch, control the load, and output a stable boost voltage, making the driving efficiency higher.
[0057] See also Figure 6 The BUCK constant current unit uses TI's TPS92 series, which has a wide operating input voltage range of 4.5V-65V. It is a monolithic dual-synchronous buck LED driver. Pins 1 and 2 are power input pins, which are powered by the output voltage of the BOOST module. Pins 22, 23, 24, and 25 are the output, input, clock line, and chip select line of the SPI, respectively, for SPI interactive communication with the microcontroller. Pin 27 is the fault feedback pin. When a fault occurs, the output value is too low and is fed back to the MCU module through a signal. Pin 26 is the LED current reference setting, and the voltage is used instead of the SPI register to set the LED current. Pins 20, 21, 28, and 29 control the load. L8 and L9 are inductors, which make the LED drive channel more stable.
[0058] In this embodiment, the control circuit further includes a signal acquisition module; the signal acquisition module is electrically connected to the MCU module. The signal acquisition module includes a voltage detection unit, a temperature acquisition unit and an LED current output adjustment unit.
[0059] Among them, the circuit of the voltage detection unit is as follows Figure 7 As shown in (a), the voltage of AD8 is set by the resistance of TR1 and TR3, and connected to the AD acquisition port of MCU to detect and identify the power signal. Figure 7 As shown in (b), the voltage of AD3 is set by setting the R55 resistor and the NTC resistor of the lamp board, and connected to the AD acquisition port of the MCU module to detect the temperature change of the lamp board to protect the lamp board from damage caused by overheating. The circuit of the LED current output adjustment unit is shown in Figure 7As shown in (c), the voltage of AD4 is set by setting the R54 resistor and the LED BIN resistor of the light board, and connected to the AD acquisition port of the MCU to read the LED information of the light board to output the current required by the corresponding LED to meet the lighting requirements.
[0060] The circuit of the MCU module is as follows Figure 8 As shown, the MCU module's single-chip microcomputer processing chip uses the S23K146 series, is powered by 5V, has 128 I / O interfaces, and has sufficient functional resources, which is completely sufficient for the entire circuit, making the logic of the entire control circuit more rigorous.
[0061] In summary, the utility model provides an LED module and control circuit for avoiding uneven brightness of LEDs, wherein the LED module includes: a plurality of LED components arranged in parallel; a plurality of LED lamps are connected in series on each of the LED components; and a resistor is connected in series above each LED lamp. By connecting a small resistance resistor in series with each LED lamp, the impedance difference of the LED line is avoided and the LED lamp with the lowest conduction voltage clamps the voltage, so that the working current of other LED lamps with higher conduction voltages is inconsistent, so that the working current of each LED lamp tends to be average, the brightness is uniform, and the cost is lower than that of a single series circuit, which is more suitable for market demand.
[0062] All devices (parts without specific structure) selected in this application are universal standard parts or parts known to those skilled in the art, and their structures and principles are known to those skilled in the art through technical manuals or conventional experimental methods. In addition, the software programs involved in this application are all prior art, and this application does not involve any improvement to the software programs.
[0063] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0064] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0065] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.
[0066] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
[0067] In addition, each functional unit in each embodiment of the present utility model may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
[0068] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. An LED module for avoiding uneven brightness of LEDs, characterized in that: include: A plurality of LED assemblies arranged in parallel; Each of the LED components is connected in series with a plurality of LED lamps; There is a resistor connected in series above each LED light.
2. The LED module according to claim 1, wherein: Each of the LED lamps is connected in parallel with a filter capacitor.
3. The LED module according to claim 1, characterized in that: The LED module also includes a light board; The plurality of LED components are fixedly arranged on the lamp board.
4. The LED module according to claim 3, characterized in that: The LED module also includes an NTC resistor.
5. A control circuit for controlling the LED module for avoiding uneven brightness of LEDs as claimed in any one of claims 1 to 4, characterized in that: include: Power input module, signal input module, power management module, constant current module, SBC module, and MCU module; The power input module is electrically connected to the power management module; The power management module is suitable for supplying power to the constant current module and the SBC module; The SBC module is electrically connected to the MCU module and is suitable for supplying power to the MCU module; The SBC module is also electrically connected to the signal input module and is adapted to transmit the received lamp signal to the MCU module; The MCU module is electrically connected to the constant current module and the LED module, and the MCU module is suitable for controlling the constant current module to supply power to the LED module, and at the same time, controlling the operation of the LED module according to the received lamp signal.
6. The control circuit according to claim 5, characterized in that: The power management module includes a filter unit, an anti-reverse MOS tube Q6, a switch MOS tube Q7 and an ideal diode controller; The control terminal DGATE pin of the ideal diode controller is electrically connected to the gate of the anti-reverse MOS tube Q6; The control terminal HGATE pin of the ideal diode controller is electrically connected to the gate of the switch MOS tube Q7; The enable terminal EN_UVLO pin of the ideal diode controller is electrically connected to the MCU module; The power input terminal Power of the power input module outputs the normally-on power supply terminal SBC_POWER through the anti-reverse MOS tube Q6 and then outputs the controllable power supply terminal POWER_IN after passing through the switch MOS tube Q7; The MCU module is suitable for sending a control signal to the enable terminal EN_UVLO of the ideal diode controller, so as to control the on-off of the switch MOS tube Q7, and further control the on-off of the controllable power supply terminal POWER_IN; The power supply terminal POWER_IN is suitable for supplying power to the constant current module; The filter unit is arranged between the power input terminal Power and the anti-reverse MOS tube Q6.
7. The control circuit according to claim 6, characterized in that: The filtering unit includes a capacitor C49, a capacitor C62 and a resistor R49; The capacitor C49, the capacitor C62 and the resistor R49 are sequentially connected in parallel between the power input terminal Power and GND.
8. The control circuit according to claim 5, characterized in that: The constant current module includes a BOOST constant voltage unit and a BUCK constant current unit; The power management module sequentially cooperates with the BOOST constant voltage unit and the BUCK constant current unit to supply power to the LED module.
9. The control circuit according to claim 5, characterized in that: The control circuit also includes a signal acquisition module; The signal acquisition module is electrically connected to the MCU module.
10. The control circuit according to claim 9, characterized in that: The signal acquisition module includes a voltage detection unit, a temperature acquisition unit and an LED current output adjustment unit.