A lighting load error reporting circuit

Abstract

This utility model discloses a lighting load error reporting circuit, including a load driving circuit, an LED load circuit group, and a load detection circuit. The LED load circuit group includes at least two sets of LED load circuits. The load driving circuit is connected to both a power supply module and the LED load circuit group, and is used to drive the LED load circuit group to operate at a constant current. The load detection circuit is connected to both the LED load circuit group and the load driving circuit, and is used to detect the operating state of each set of LED load circuits in the LED load circuit group, and control the operating state of the load driving circuit according to the operating state of the LED load circuits. This utility model can achieve load error reporting functionality through a hardware logic circuit structure, with high detection accuracy and response sensitivity, and low cost.

Description

Technical Field

[0001] This utility model relates to the field of LED load detection technology, and in particular to a lighting load error reporting circuit. Background Technology

[0002] Currently, in factory R&D, most LED load control and error reporting methods rely on programmable microcontrollers (MCUs), which need to be designed onto the driver board. This forces the driver board to accommodate other external circuits such as DC chips and MCU chips, requiring it to detect load errors, determine fault conditions using the MCU, and output fault signals to the main control unit. If the MCU is used in conjunction with a current sensing chip, the MCU can use program code instructions to read the current value calculated by the current sensing chip, and then determine if the current value is within a preset range. If it does not, the load circuit is cut off. However, this solution requires an additional current sensing chip besides the programmable chip to detect and determine load errors, resulting in higher costs. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a lighting load error reporting circuit that can realize the load error reporting function through hardware logic circuit structure, with high detection accuracy and response sensitivity, and low cost.

[0004] To address the aforementioned technical problems, this utility model provides a lighting load error reporting circuit, comprising a load driving circuit, an LED load circuit group, and a load detection circuit. The LED load circuit group includes at least two sets of LED load circuits. The load driving circuit is connected to both the power supply module and the LED load circuit group, and is used to drive the LED load circuit group to operate at a constant current. The load detection circuit is connected to both the LED load circuit group and the load driving circuit, and is used to detect the operating state of each set of LED load circuits in the LED load circuit group, and control the operating state of the load driving circuit according to the operating state of the LED load circuits.

[0005] As an improvement to the above solution, the LED load circuit includes an LED load sub-circuit and a load error reporting sub-circuit; the load driving circuit is connected to the LED load sub-circuit and is used to provide a constant current power supply to the LED load sub-circuit so that the LED load sub-circuit operates at a constant current; the load error reporting sub-circuit is connected to both the load detection circuit and the LED load sub-circuit and is used to output a load control signal to the load detection circuit according to the operating state of the LED load sub-circuit, so that the load detection circuit controls the operating state of the load driving circuit according to the load control signal.

[0006] As an improvement to the above solution, the load driving circuit includes a constant current driving chip, which includes a power supply pin, an enable pin, a switch control pin, a feedback pin, a positive power supply pin, and a ground pin. The power supply pin is connected to the output terminal of the power module, the switch control pin is connected to one power supply terminal of the LED load circuit group, the feedback pin is connected to the other power supply terminal of the LED load circuit group, the positive power supply pin is connected to the ground pin via a capacitor, and the ground pin is grounded. The enable pin is connected to the output terminal of the load detection circuit and is used to control the working state of the constant current driving chip according to the detection signal output by the load detection circuit.

[0007] As an improvement to the above solution, the load detection circuit includes a first switch module and a second switch module; the first switch module is connected to the LED load circuit group and the second switch module respectively, and is used to control the on / off state of the first switch module according to the working state of the LED load circuit in the LED load circuit group, and to control the on / off state of the second switch module according to the on / off state of the first switch module; the second switch module is connected to the load driving circuit, and is used to control the working state of the load driving circuit according to the on / off state of the second switch module.

[0008] As an improvement to the above solution, the LED load sub-circuit and the load error reporting sub-circuit are configured in a one-to-one correspondence. The LED load sub-circuit includes an LED load module and a first resistor. The positive terminal of the LED load module is connected to the positive terminal of the power supply, and the negative terminal is grounded through the first resistor. The connection point between the LED load module and the first resistor is set as the load connection point. The load error reporting sub-circuit includes a third switch module and a fourth switch module. The third switch module is connected to the load connection point and the fourth switch module respectively, and is used to control the on / off state of the third switch module according to the working state of the LED load module, and to control the on / off state of the fourth switch module according to the on / off state of the third switch module. The load detection circuit is connected to the fourth switch module and is used to control the working state of the load driving circuit according to the on / off state of the fourth switch module.

[0009] As an improvement to the above solution, multiple LED load sub-circuits are respectively connected to the same load error reporting sub-circuit. Each LED load sub-circuit includes an LED load module and a first resistor. The positive terminal of the LED load module is connected to the positive terminal of the power supply, and the negative terminal is grounded through the first resistor. The connection point between the LED load module and the first resistor is designated as the load connection point. The load error reporting sub-circuit includes a third switch module, a fourth switch module, a first diode, a second resistor, and a second diode. The positive terminal of the power supply is connected to multiple load connection points through the forward-biased first diode, and the positive terminal of the power supply is also connected to the third switch module through the forward-biased second diode. The third switch module is connected to the fourth switch module and is used to control the on / off state of the third switch module according to the working state of the LED load module, and to control the on / off state of the fourth switch module according to the on / off state of the third switch module. The load detection circuit is connected to the fourth switch module and is used to control the working state of the load driving circuit according to the on / off state of the fourth switch module.

[0010] As an improvement to the above solution, the LED load sub-circuit and the load error reporting sub-circuit are configured in a one-to-one correspondence. The LED load sub-circuit includes an LED load module and a first resistor. The positive terminal of the LED load module is connected to the positive terminal of the power supply via the first resistor, and the negative terminal is connected to the negative terminal of the power supply. The connection point between the LED load module and the first resistor is designated as the load connection point. The load error reporting sub-circuit includes a third switch module, a fourth switch module, and a fifth switch module. The third switch module is connected to the load connection point and the fourth switch module, respectively, and is connected to the LED load module via the first resistor. It is used to control the on / off state of the third switch module according to the working state of the LED load module, and to control the on / off state of the fourth switch module according to the on / off state of the third switch module. The fifth switch module is connected to the fourth switch module and the load detection circuit, respectively. It is used to control the working state of the load detection circuit according to the on / off state of the fourth switch module, thereby controlling the working state of the load driving circuit.

[0011] As an improvement to the above solution, multiple LED load sub-circuits are respectively connected to the same load error reporting sub-circuit. Each LED load sub-circuit includes an LED load module and a first resistor. The positive terminal of the LED load module is connected to the positive terminal of the power supply via the first resistor, and the negative terminal is connected to the negative terminal of the power supply. The connection point between the LED load module and the first resistor is designated as the load connection point. The load error reporting sub-circuit includes a third switch module, a fourth switch module, a fifth switch module, a first diode, a second resistor, and a second diode. The third switch module is grounded via a forward-biased second diode and a second resistor. The connection point between the second diode and the second resistor is connected to multiple load connection points via reverse-biased second diodes. The third switch module is connected to the fourth switch module and is used to control the on / off state of the third switch module according to the working state of the LED load module, and to control the on / off state of the fourth switch module according to the on / off state of the third switch module. The fifth switch module is connected to the fourth switch module and the load detection circuit respectively and is used to control the working state of the load detection circuit according to the on / off state of the fourth switch module, thereby controlling the working state of the load driving circuit.

[0012] As an improvement to the above solution, the constant current drive chip further includes a fault reporting pin, which is used to send a fault signal to the external master controller based on the detection signal output by the load detection circuit, or to control the drive external reporting circuit to send a fault signal to the external master controller; the drive external reporting circuit includes a sixth switch module, which is connected to the fault reporting pin and the external master controller respectively.

[0013] As an improvement to the above solution, the power module includes a rectifier circuit, the two ends of which are respectively connected to the external power supply and the load drive circuit.

[0014] The beneficial effects of implementing this utility model are as follows:

[0015] This invention can detect the working status of each LED load circuit in the LED load circuit group through a load detection circuit, and control the working status of the load drive circuit according to the working status of the LED load circuit, thereby realizing the "one fail all fail" function, that is, when one group of LED load circuits fails, all groups of LED load circuits stop working.

[0016] Furthermore, this invention employs a logic circuit design method, utilizing the conduction characteristics of the logic switch module to automatically implement the hardware logic error reporting function. This eliminates the need for additional programmable chips and current detection chips, resulting in low circuit cost. Moreover, the hardware circuit enables rapid and accurate response, efficiently cutting off the power supply to all load circuits and achieving rapid feedback of anomalies. Therefore, compared to microprocessors and other digital circuits, this logic circuit offers advantages such as faster response speed, higher control precision, lower cost, and the elimination of the need for software control. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the lighting load error reporting circuit of this utility model;

[0018] Figure 2 This is a schematic diagram of the load drive circuit, rectifier circuit, and drive external circuit of this utility model;

[0019] Figure 3 This is a circuit structure diagram of the load drive circuit of this utility model;

[0020] Figure 4 This is a circuit structure diagram of the first embodiment of the load detection circuit and LED load circuit group of this utility model;

[0021] Figure 5 This is a circuit structure diagram of the second embodiment of the LED load circuit group of this utility model;

[0022] Figure 6 This is a circuit structure diagram of the third embodiment of the LED load circuit group of this utility model;

[0023] Figure 7 This is a circuit structure diagram of the fourth embodiment of the LED load circuit group of this utility model;

[0024] Figure 8 This is a circuit structure diagram of the driving external alarm circuit of this utility model;

[0025] Figure 9 This is a circuit diagram of the rectifier circuit of this utility model. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will describe this utility model in further detail with reference to the accompanying drawings. It is hereby declared that the terms "up," "down," "left," "right," "front," "back," "inner," and "outer," etc., appearing or about to appear in this document, are based solely on the accompanying drawings and are not intended to specifically limit this utility model.

[0027] like Figure 1As shown in the figure, a specific embodiment of this utility model provides a lighting load error reporting circuit, including a load driving circuit 1, an LED load circuit group 2, and a load detection circuit 3. The LED load circuit group 2 includes at least two groups of LED load circuits 21. The load driving circuit 1 is connected to the power supply module 4 and the LED load circuit group 2 respectively, and is used to drive the LED load circuit group 2 to operate at a constant current. The load detection circuit 3 is connected to the LED load circuit group 2 and the load driving circuit 1 respectively, and is used to detect the working state of each group of LED load circuits 21 in the LED load circuit group 2, and control the working state of the load driving circuit 1 according to the working state of the LED load circuits 21.

[0028] The load driving circuit 1 drives all LED load circuits 21 in the LED load circuit group 2 to operate at a constant current. When all LED load circuits 21 are working normally, the load detection circuit 3 detects the corresponding control signal and sends it to the load driving circuit 1 to drive the load driving circuit 1 to continue working, ensuring stable operation of the lighting. When any LED load circuit 21 in the group fails to work due to damage, the load detection circuit 3 detects the corresponding detection signal and sends it to the load driving circuit 1 to control the load driving circuit 1 to stop working, thereby controlling all LED load circuits 21 in the LED load circuit group 2 to stop working, realizing the "one fail all fail" function and the rapid error reporting function, so that users can know that the lighting is abnormal and need to be repaired in time. The lighting load error reporting circuit of this utility model can be applied to different lighting scenarios and has high applicability.

[0029] Furthermore, this invention employs a logic circuit design method, utilizing the conduction characteristics of the logic switch module to automatically implement the hardware logic error reporting function. This eliminates the need for additional programmable chips and current detection chips, resulting in low circuit cost. Moreover, the hardware circuit enables rapid and accurate response, efficiently cutting off the power supply to all load circuits and achieving rapid feedback of anomalies. Therefore, compared to microprocessors and other digital circuits, this logic circuit offers advantages such as faster response speed, higher control precision, lower cost, and the elimination of the need for software control.

[0030] Specifically, the LED load circuit 21 includes an LED load sub-circuit and a load error reporting sub-circuit; the load driving circuit 1 is connected to the LED load sub-circuit and is used to provide a constant current power supply to the LED load sub-circuit so that the LED load sub-circuit operates at a constant current; the load error reporting sub-circuit is connected to the load detection circuit 3 and the LED load sub-circuit respectively, and is used to output a load control signal to the load detection circuit 3 according to the operating state of the LED load sub-circuit, so that the load detection circuit 3 controls the operating state of the load driving circuit 1 according to the load control signal.

[0031] According to the actual circuit design requirements, in the multiple LED load circuits 21, multiple LED load sub-circuits can share a load error reporting sub-circuit. That is, the multiple LED load circuits 21 include multiple LED load sub-circuits and a shared load error reporting sub-circuit. Alternatively, each of the multiple LED load sub-circuits can be equipped with a corresponding load error reporting sub-circuit to achieve a one-to-one circuit connection. That is, each LED load circuit 21 includes a set of LED load sub-circuits and a set of load error reporting sub-circuits. The above circuit designs can all realize the "one fail all fail" function and the fast error reporting function.

[0032] If any LED load sub-circuit in the multiple LED load sub-circuits fails to work due to damage, the load error reporting sub-circuit connected to the corresponding LED load sub-circuit or the shared load error reporting sub-circuit can detect the corresponding load control signal and send the load control signal to the load detection circuit 3. The load detection circuit 3 then controls the working state of the load drive circuit 1 according to the load control signal, thereby controlling the working state of the LED load circuit group 2 and realizing the "one fail all fail" function and the fast error reporting function.

[0033] Furthermore, in this embodiment, as Figure 2 As shown, the load drive circuit 1 is connected to the external alarm circuit to control the external alarm circuit to send a fault signal to the external main controller, thereby causing the external main controller to issue a warning fault message to the user, thus promptly reminding the user to perform maintenance and further realizing a rapid error reporting function. For example, when a car's headlights malfunction, the fault warning light can be controlled to activate. In other embodiments, the load drive circuit 1 can also be directly connected to the external main controller to send a fault signal to the external main controller, achieving the same function.

[0034] Furthermore, such as Figure 2As shown, the power module 4 includes a rectifier circuit. The two ends of the rectifier circuit are connected to the external power supply and the load drive circuit 1, respectively. The rectifier circuit is used to rectify the power input from the external power supply, provide a clean power input for the subsequent circuits, prevent the drive chip in the load drive circuit 1 from being affected by voltage surges, and improve the stability of circuit operation.

[0035] Specifically, such as Figures 3 to 9 As shown, the load driving circuit 1, load detection circuit 3, LED load circuit group 2, driver alarm circuit and power supply module 4 are described in detail below with reference to specific embodiments:

[0036] I. Load Drive Circuit 1

[0037] like Figure 3 As shown, the load drive circuit 1 includes a constant current drive chip U300 and its peripheral circuits. The constant current drive chip U300 includes a power supply pin VIN, an enable pin EN, a switch control pin SW, a feedback pin FB, a power supply positive pin VCC, and a ground pin GND.

[0038] The power supply pin VIN is connected to the output terminal of the power module to power on the constant current driver chip U300; the switch control pin SW is connected to one power supply terminal of the LED load circuit group, and the feedback pin FB is connected to the other power supply terminal of the LED load circuit group to drive the LED load circuit group to illuminate; the positive power supply pin VCC is connected to the ground pin GND through capacitor C307, and the ground pin GND is grounded; the enable pin EN is connected to the output terminal of the load detection circuit and is used to control the working state of the constant current driver chip according to the detection signal output by the load detection circuit.

[0039] If any LED load circuit in the LED load circuit group fails, the load detection circuit will detect the corresponding detection signal and send an enable control signal EN to the enable pin of the constant current driver chip. This controls the constant current driver chip to stop working, thus ceasing to provide constant current power to the LED load circuit group, effectively cutting off the power supply and stopping the LED load circuit group from lighting up. This achieves the "one fail, all fail" function and rapid error reporting. Conversely, when all LED load circuits in the LED load circuit group are working normally, the load detection circuit also sends a corresponding enable control signal EN to keep the constant current driver chip working, thereby maintaining the lighting operation of the LED load circuit group.

[0040] In this embodiment, the specific circuit structure and connection relationship of the peripheral circuit can be seen in the following figure. Figure 3The circuit diagram shown will not be described in detail here. In other embodiments, the peripheral circuit structure of the constant current driver chip can be adjusted according to actual design requirements, as long as it meets the circuit design functions of the constant current driver chip described above.

[0041] Preferably, in this embodiment, the switch control pin SW is connected to the positive terminal of the power supply of the LED load circuit group, and the feedback pin FB is connected to the negative terminal of the power supply of the LED load circuit group. At this time, the constant current driving chip is a high-side constant current driving chip, which has a high-side constant current output mode. Constant current lighting is achieved by controlling the switch between the positive terminal of the driving power supply and the positive terminal of the LED load circuit group.

[0042] In another embodiment, the switch control pin SW is connected to the negative terminal of the power supply of the LED load circuit group, and the feedback pin FB is connected to the positive terminal of the power supply of the LED load circuit group. In this case, the constant current driver chip is a low-side constant current driver chip, which has a low-side constant current output mode. Constant current lighting is achieved by controlling the current path of the negative circuit of the LED load circuit group.

[0043] II. Load Detection Circuit 3

[0044] like Figure 4 As shown, the load detection circuit 3 includes a first switch module Q4 and a second switch module Q3, a third resistor R7, a fourth resistor R5, a fifth resistor R3, a first capacitor C7, a second capacitor C6, and a third capacitor C5.

[0045] The base of the first switching module Q4 is connected to the LED load circuit group and to the power supply 5V_VCC via the third resistor R7. The base of the first switching module Q4 is also grounded via the first capacitor C7. The collector of the first switching module Q4 is connected to the power supply 5V_VCC via the fourth resistor R5. The emitter of the first switching module Q4 is grounded. The base of the second switching module Q3 is connected to the collector of the first switching module Q4 and to the ground via the second capacitor C6. The collector of the second switching module Q3 is connected to the power supply 5V_VCC via the fifth resistor R3 and to the ground via the third capacitor C5. The collector of the second switching module Q3 is also connected to the enable terminal of the load drive circuit. The emitter of the second switching module Q3 is grounded.

[0046] It should be noted that when the LED load circuit group is working normally, the first switch module Q4 is turned on and the second switch module Q3 is not turned on. The load detection circuit 3 outputs a high-level enable control signal EN to the enable terminal of the load drive circuit (i.e., the enable pin EN of the constant current drive chip) to control the load drive circuit to work, thereby driving the LED load circuit group to work normally.

[0047] When any LED load circuit in the LED load circuit group malfunctions, the base level of the first switch module Q4 will be pulled low, causing it to stop conducting. At this time, the second switch module Q3 will turn on, and the load detection circuit 3 will output a low-level enable control signal EN to the enable terminal of the load drive circuit to control the load drive circuit to stop working, thereby driving all LED load circuits in the LED load circuit group to stop lighting, realizing the "one fail all fail" function.

[0048] Preferably, in other embodiments, if the subsequent circuit of the load detection circuit does not have ESD protection requirements, the load detection circuit can retain only the first switch module Q4 and the third resistor R7, without retaining other circuit structures to achieve level conversion between the load detection circuit and the subsequent circuit. This circuit can also send an enable control signal of the corresponding level to the load drive circuit to control the operating state of the load drive circuit and the LED load circuit group.

[0049] III. LED Load Circuit Group 2

[0050] like Figure 4 As shown, Figure 4 A circuit diagram of a first embodiment of the LED load circuit group is shown.

[0051] The LED load circuit group in this embodiment is adapted to the high-side constant current output mode of the load drive circuit. The LED load circuit group includes multiple LED load circuits. The LED load sub-circuit 211 and the load error reporting sub-circuit 212 are configured in a one-to-one correspondence. The first LED load sub-circuit 211 includes an LED load module 7 and a first resistor R6. The positive terminal of the LED load module 7 is connected to the positive power supply LED+. The positive power supply LED+ is connected to the negative power supply LED- through a fourth capacitor C8. The negative terminal of the LED load module 7 is grounded through the first resistor R6. The connection point between the LED load module 7 and the first resistor R6 is set as the load connection point. The LED load module 7 includes multiple LEDs.

[0052] The first set of load error reporting sub-circuits 212 includes a third switch module Q2, a fourth switch module Q1, a sixth resistor R4, a seventh resistor R1, an eighth resistor R2, a fifth capacitor C4, and a sixth capacitor C3. The base of the third switch module Q2 is connected to the load connection point via the sixth resistor R4 and grounded via the fifth capacitor. The collector of the third switch module Q2 is connected to the positive power supply VBAT via the seventh resistor R1 and connected to the base of the fourth switch module Q1 via the eighth resistor R2. The base of the fourth switch module Q1 is grounded via the sixth capacitor C3. The collector of the fourth switch module Q1 is connected to the load detection circuit. The emitters of both the third switch module Q2 and the fourth switch module Q1 are grounded.

[0053] It should be noted that the circuit structures of the multiple sets of LED load sub-circuits 211 are the same, and the circuit structures of the multiple sets of load error reporting sub-circuits 212 are the same, which will not be described in detail here.

[0054] When any LED load sub-circuit 211 fails, such as when any LED in the first LED load sub-circuit 211 fails, the first LED load sub-circuit 211 stops working. The third switch module Q2 is not turned on, and the fourth switch module Q1 is turned on. At this time, the level of the detection terminal of the load detection circuit will be pulled low. The load detection circuit will output a low-level enable control signal EN to control the load drive circuit to give the enable terminal of the load drive circuit, so as to control the load drive circuit to stop working, thereby driving all LED load circuits in the LED load circuit group to stop lighting, realizing the "one fail all fail" function.

[0055] Conversely, when all LED load sub-circuits 211 are working normally, the third switch module Q2 in the first load error reporting sub-circuit 212 is turned on and the fourth switch module Q1 is not turned on. The other load error reporting sub-circuits 212 operate in the same way. At this time, the level of the detection terminal of the load detection circuit remains high. The load detection circuit outputs a high-level enable control signal EN to the enable terminal of the load drive circuit to control the load drive circuit to work, thereby driving the LED load circuit group to work normally.

[0056] Furthermore, in the existing LED load error reporting scheme, the working state of each LED load needs to be controlled through multiple pins of the MCU chip. When the driver board and the load board are separated into two boards, these pins will increase the wiring harness between the two boards, resulting in too many inter-board connection wires, and also hindering the universality of the driver board.

[0057] In this regard, such as Figure 4 As shown, the LED load circuit group is set on the load board 8, and the load detection circuit is set on the driver board 9. Only five wires are needed to electrically connect the two boards, thus achieving the electrical connection between the LED load circuit group and the load detection circuit. This method saves on the connecting wires between the driver board 9 and the load board 8, ensures versatility between them, and achieves the effect of all LEDs turning off if one LED fails.

[0058] like Figure 5 As shown, Figure 5 A circuit diagram of a second embodiment of the LED load circuit group is shown.

[0059] In this embodiment, the LED load circuit group is adapted to the high-side constant current output mode of the load drive circuit. In multiple LED load circuits, multiple LED load sub-circuits 211 are respectively connected to the same load error reporting sub-circuit 212. The first group of LED load sub-circuits 211 includes an LED load module 7 and a first resistor R18. The positive terminal of the LED load module 7 is connected to the positive power supply LED+, and the positive power supply LED+ is connected to the negative power supply LED- through a sixth capacitor C20. The negative terminal of the LED load module 7 is grounded through the first resistor R18. The connection point between the LED load module 7 and the first resistor R18 is set as the load connection point. The LED load module 7 includes multiple LEDs.

[0060] The load error reporting subcircuit 212 includes a third switch module Q12, a fourth switch module Q11, a first diode D1, a second diode D2, a second resistor R21, a ninth resistor R20, a seventh capacitor C19, and an eighth capacitor C18. The positive terminal VBAT of the power supply is connected sequentially to the base of the third open-circuit module Q12 and one end of the seventh capacitor C19 via the second resistor R21 and the forward-biased second diode D2, respectively. The other end of the second capacitor C19 is grounded. The connection point between the second resistor R21 and the second diode D2 is connected to multiple load connection points via forward-biased first diodes (D1, D3, and D4). The collector of the third switch module Q12 is connected to the positive terminal VBAT of the power supply and the base of the fourth switch module Q11 via the ninth resistor R20. The base of the fourth switch module Q11 is also grounded via the eighth capacitor C18. The collector of the fourth switch module Q11 is connected to the detection terminal of the load detection circuit. The emitters of both the third switch module Q12 and the fourth switch module Q11 are grounded.

[0061] It should be noted that the circuit structures of the multiple LED load sub-circuits 211 are the same, and will not be described in detail here.

[0062] When any LED load sub-circuit 211 fails, such as when any LED in the first LED load sub-circuit 211 fails, the first LED load sub-circuit 211 stops working. The first diode D1 is turned on, the second diode D2 is not turned on, the third switch module Q12 is not turned on, and the fourth switch module Q11 is turned on. At this time, the level of the detection terminal of the load detection circuit will be pulled low. The load detection circuit will output a low-level enable control signal EN to control the load drive circuit to give the enable terminal of the load drive circuit, so as to control the load drive circuit to stop working, thereby driving all LED load circuits in the LED load circuit group to stop lighting, realizing the "one fail all fail" function.

[0063] Conversely, when all LED load sub-circuits 211 are working normally, the first diode D1 in the load error reporting sub-circuit 212 is not conducting, the second diode D2 is conducting, the third switch module Q12 is conducting, and the fourth switch module Q11 is not conducting. At this time, the level of the detection terminal of the load detection circuit remains high, and the load detection circuit outputs a high-level enable control signal EN to the enable terminal of the load drive circuit to control the load drive circuit to work, thereby driving the LED load circuit group to work normally.

[0064] like Figure 6 As shown, Figure 6 The circuit diagram of the third embodiment of the LED load circuit group is shown.

[0065] In this embodiment, the LED load circuit group is adapted to the low-side constant current output mode of the load drive circuit. In multiple LED load circuits, the LED load sub-circuit 211 and the load error reporting sub-circuit 212 are arranged in a one-to-one correspondence. The first group of LED load sub-circuits 211 includes an LED load module 7 and a first resistor R24. The positive terminal of the LED load module 7 is connected to the positive power supply LED+ via the first resistor R24, and the negative terminal is connected to the negative power supply LED-. The positive power supply LED+ is connected to the negative power supply LED- via a ninth capacitor C20. The connection point between the LED load module 7 and the first resistor R24 ​​is set as the load connection point. The LED load module 7 includes multiple LEDs.

[0066] The first group of load error reporting sub-circuits 212 includes a third switch module Q13, a fourth switch module Q15, a fifth switch module Q14, a tenth resistor R26, an eleventh resistor R30, a twelfth resistor R28, a thirteenth resistor R25, a tenth capacitor C21, an eleventh capacitor C25, and a twelfth capacitor C24.

[0067] The base of the third switch module Q13 is connected to the load connection point via the tenth resistor R26. The base of the third switch module Q13 is also connected to one end of the first resistor R24 ​​and the positive power supply VBAT via the tenth capacitor C21. The emitter of the third switch module Q13 is connected to the positive power supply VBAT. The collector of the third switch module Q13 is grounded via the eleventh resistor R30. The base of the third switch module Q13 is also connected to the base of the fourth switch module Q15 via the twelfth resistor R28. The base of the fourth switch module Q15 is grounded via the eleventh capacitor C25. The collector of the fourth switch module Q15 is connected to the positive power supply VBAT via the thirteenth resistor R25 and is also grounded via the twelfth capacitor C24. The base of the fifth switch module Q14 is connected to the collector of the fourth switch module Q15. The collector of the fifth switch module Q14 is connected to the detection terminal of the load detection circuit. The emitters of both the fifth switch module Q14 and the fourth switch module Q15 are grounded.

[0068] It should be noted that the circuit structures of the multiple sets of LED load sub-circuits 211 are the same, and the circuit structures of the multiple sets of load error reporting sub-circuits 212 are the same, which will not be described in detail here.

[0069] When any LED load sub-circuit 211 fails, such as when any LED in the first LED load sub-circuit 211 fails, the first LED load sub-circuit 211 stops working. The third switch module Q13 and the fourth switch module Q15 are not conducting, while the fifth switch module Q14 is conducting. At this time, the level of the detection terminal of the load detection circuit will be pulled low, and the load detection circuit will output a low-level enable control signal EN to control the load drive circuit to give to the enable terminal of the load drive circuit, so as to control the load drive circuit to stop working, thereby driving all LED load circuits in the LED load circuit group to stop lighting, realizing the "one fail all fail" function.

[0070] Conversely, when all LED load sub-circuits 211 are working normally, the third switch module Q13 is turned on, the fourth switch module Q15 is turned on, and the fifth switch module Q14 is not turned on. The other load error reporting sub-circuits 212 operate in the same way. At this time, the level of the detection terminal of the load detection circuit remains high, and the load detection circuit outputs a high-level enable control signal EN to the enable terminal of the load drive circuit to control the load drive circuit to work, thereby driving the LED load circuit group to work normally.

[0071] like Figure 7 As shown, Figure 7 The circuit structure diagram of the fourth embodiment of the LED load circuit group is shown.

[0072] In this embodiment, the LED load circuit group is adapted to the low-side constant current output mode of the load drive circuit. In multiple LED load circuits, multiple LED load sub-circuits 211 are respectively connected to the same load error reporting sub-circuit 212. Each LED load sub-circuit 211 includes an LED load module 7 and a first resistor R42. The positive terminal of the LED load module 7 is connected to the positive power supply LED+ via the first resistor R42, and the negative terminal is connected to the negative power supply LED-. The positive power supply LED+ is connected to the negative power supply LED- via the thirteenth capacitor C44. The connection point between the LED load module 7 and the first resistor R42 is designated as the load connection point. The LED load module 7 includes multiple LEDs.

[0073] The load error reporting sub-circuit 212 includes a third switch module Q26, a fourth switch module Q28, a fifth switch module Q27, a first diode D5, a second resistor R49, a second diode D6, a fourteenth resistor R50, a fifteenth resistor R48, a sixteenth resistor R46, a fourteenth capacitor C38, a fifteenth capacitor C43, and a sixteenth capacitor C42.

[0074] The base of the third switch module Q26 is grounded via a forward-biased second diode D6 and a second resistor R49. The connection point between the second diode D6 and the second resistor R49 is connected to multiple load connection points via reverse-biased second diodes (D5, D7, and D8). The base of the third switch module Q26 is also connected to the emitter and the positive power supply VBAT via a fourteenth capacitor C38. The collector of the third switch module Q26 is grounded via a fourteenth resistor R50 and is also connected to the base of the fourth switch module Q28 and one end of the fifteenth capacitor C43 via a fifteenth resistor R48. The other end of the fifteenth capacitor C43 is grounded. The collector of the fourth switch module Q28 is connected to the base of the fifth switch module Q27 and is connected to the positive power supply VBAT via a sixteenth resistor R46. The sixteenth capacitor C42 is also grounded. The collector of the fifth switch module Q27 is connected to the detection terminal of the load detection circuit. The emitters of both the fourth switch module Q28 and the fifth switch module Q27 are grounded.

[0075] It should be noted that the circuit structures of the multiple LED load sub-circuits 211 are the same, and will not be described in detail here.

[0076] When any LED load sub-circuit 211 fails, such as when any LED in the first LED load sub-circuit 211 fails, the first LED load sub-circuit 211 stops working. The voltage level between the second diode D6 and the second resistor R49 is pulled high by the LED load module 7. The second diode D6 is not conducting, the third switch module Q26 is not conducting, the fourth switch module Q28 is not conducting, and the fifth switch module Q27 is conducting. At this time, the voltage level at the detection terminal of the load detection circuit will be pulled low. The load detection circuit will output a low-level enable control signal EN to control the load drive circuit to give the enable terminal of the load drive circuit, so as to control the load drive circuit to stop working, thereby driving all LED load circuits in the LED load circuit group to stop lighting, realizing the "onefail all fail" function.

[0077] Conversely, when all LED load sub-circuits 211 are working normally, the voltage level between the second diode D6 and the second resistor R49 in the load error reporting sub-circuit 212 is pulled low by the LED load module 7. The second diode D6 is turned on, the third switch module Q26 is turned on, the fourth switch module Q28 is turned on, and the fifth switch module Q27 is not turned on. At this time, the voltage level at the detection terminal of the load detection circuit remains high. The load detection circuit outputs a high-level enable control signal EN to the enable terminal of the load drive circuit to control the load drive circuit to work, thereby driving the LED load circuit group to work normally.

[0078] IV. External Reporting Circuit 5

[0079] like Figure 8 As shown. The driving external alarm circuit includes a Zener diode DZ400, a third diode D400, a seventeenth resistor R400, an eighteenth resistor R401, a nineteenth resistor R404, a twentieth resistor R403, a twenty-first resistor R402, a twenty-second resistor R405, a seventeenth capacitor C401, an eighteenth capacitor C400, and a sixth switch module. The sixth switch module includes a first transistor Q400 and a second transistor Q401. The constant current driving chip U300 also includes a fault report pin FAULTB.

[0080] The collector of the first transistor Q400 is connected to the positive power supply pin VCC of the constant current driver chip U300 via the eighteenth resistor R401 and the seventeenth resistor R400. The connection point between the eighteenth resistor R401 and the seventeenth resistor R400 is grounded through the Zener diode DZ400 and also connected to the fault report pin FAULTB of the constant current driver chip U300 via the twenty-second resistor R405. The emitter of the first transistor Q400 is grounded through the nineteenth resistor R404. The base of the first transistor Q400 is connected to the collector of the first transistor Q400 and grounded through the seventeenth capacitor C401. The base of the second transistor Q401 is connected to the base of the first transistor Q400. The collector of the second transistor Q401 is connected to the connection terminal of the external main controller and grounded through the eighteenth capacitor C400. The twenty-first resistor R402 and the third diode D400 are both connected in parallel with the eighteenth capacitor C400. The emitter of the eighteenth capacitor C400 is grounded through the twentieth resistor R403.

[0081] It should be noted that when any LED load circuit in the LED load circuit group malfunctions, the constant current driver chip U300 in the load drive circuit will receive a signal from the load detection circuit. In response, the constant current driver chip will send a corresponding signal to drive the external alarm circuit to send a fault signal to the external controller, and then it will stop working. The external controller can then send a warning fault message to the user based on this signal, thus promptly reminding the user to perform maintenance and further realizing a rapid fault reporting function. For example, when a car's headlights malfunction, the warning lights can be activated.

[0082] V. Rectifier Circuit 41

[0083] like Figure 9 As shown, the rectifier circuit includes a 23rd resistor R200, a 19th capacitor C200, a 20th capacitor C201, a 21st capacitor C204, a 22nd capacitor C205, a 23rd capacitor C202, a 24th capacitor C203, a 4th diode D202, a 5th diode D200, a 6th diode D201, a TVS diode TV202, and an inductor L200.

[0084] External power supply PWR1 is grounded sequentially through the nineteenth capacitor C200 and the twentieth capacitor C201, and also through the twenty-third resistor R200. External power supply PWR1 is also connected to the fourth diode D202. External power supply PWR1 is connected to one end of inductor L200 through the fifth diode D200. The sixth diode D201 is connected in parallel with the fifth diode D200. The connection point between the fifth diode D200 and inductor L200 is grounded through TVS diode TV202. The twenty-first capacitor C204 and the twenty-second capacitor C205 are both connected in parallel with TVS diode TV202. The other end of inductor L200 is grounded through the twenty-third capacitor C202 and the twenty-fourth capacitor C203. The other end of inductor L200 also outputs power VIN-AFT to the load drive circuit to power it on.

[0085] It should be noted that the above rectifier circuit can rectify the input external power supply PWR1 to output a clean DC power supply VIN-AFT to the load drive circuit, preventing the drive chip in the load drive circuit from being interfered with by voltage surges and improving the stability of circuit operation.

[0086] In summary, the load detection circuit of this utility model can detect the working status of each LED load circuit in the LED load circuit group, and control the working status of the load driving circuit according to the working status of the LED load circuit, thereby realizing the "one fail all fail" function, that is, when one group of LED load circuits fails, all groups of LED load circuits stop working.

[0087] Furthermore, this invention employs a logic circuit design method, utilizing the conduction characteristics of the logic switch module to automatically implement the hardware logic error reporting function. This eliminates the need for additional programmable chips and current detection chips, resulting in low circuit cost. Moreover, the hardware circuit enables rapid and accurate response, efficiently cutting off the power supply to all load circuits and achieving rapid feedback of anomalies. Therefore, compared to microprocessors and other digital circuits, this logic circuit offers advantages such as faster response speed, higher control precision, lower cost, and the elimination of the need for software control.

[0088] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A lighting load error reporting circuit, characterized in that, It includes a load driving circuit, an LED load circuit group, and a load detection circuit, wherein the LED load circuit group includes at least two LED load circuits; The load driving circuit is connected to the power module and the LED load circuit group respectively, and is used to drive the LED load circuit group to operate at constant current. The load detection circuit is connected to the LED load circuit group and the load driving circuit respectively, and is used to detect the working status of each LED load circuit in the LED load circuit group, and control the working status of the load driving circuit according to the working status of the LED load circuit.

2. The lighting load error reporting circuit as described in claim 1, characterized in that, The LED load circuit includes an LED load sub-circuit and a load error reporting sub-circuit; The load driving circuit is connected to the LED load sub-circuit and is used to provide a constant current power supply to the LED load sub-circuit so that the LED load sub-circuit can operate at a constant current. The load error reporting sub-circuit is connected to the load detection circuit and the LED load sub-circuit respectively, and is used to output a load control signal to the load detection circuit according to the working state of the LED load sub-circuit, so that the load detection circuit controls the working state of the load drive circuit according to the load control signal.

3. The lighting load error reporting circuit as described in claim 1 or 2, characterized in that, The load driving circuit includes a constant current driving chip, which includes a power supply pin, an enable pin, a switch control pin, a feedback pin, a positive power supply pin, and a ground pin. The power supply pin is connected to the output terminal of the power module, the switch control pin is connected to one power supply terminal of the LED load circuit group, the feedback pin is connected to the other power supply terminal of the LED load circuit group, and the enable pin is connected to the output terminal of the load detection circuit, which is used to control the working state of the constant current drive chip according to the detection signal output by the load detection circuit.

4. The lighting load error reporting circuit as described in claim 1 or 2, characterized in that, The load detection circuit includes a first switching module and a second switching module; The first switch module is connected to the LED load circuit group and the second switch module respectively, and is used to control the on / off state of the first switch module according to the working state of the LED load circuit in the LED load circuit group, and to control the on / off state of the second switch module according to the on / off state of the first switch module. The second switch module is connected to the load drive circuit and is used to control the working state of the load drive circuit according to the on / off state of the second switch module.

5. The lighting load error reporting circuit as described in claim 2, characterized in that, The LED load sub-circuit and the load error reporting sub-circuit are configured in a one-to-one correspondence. The LED load sub-circuit includes an LED load module and a first resistor. The positive terminal of the LED load module is connected to the positive terminal of the power supply, and the negative terminal is grounded through the first resistor. The connection point between the LED load module and the first resistor is set as the load connection point. The load error reporting sub-circuit includes a third switch module and a fourth switch module. The third switch module is connected to the load connection point and the fourth switch module respectively. It is used to control the on / off state of the third switch module according to the working state of the LED load module, and to control the on / off state of the fourth switch module according to the on / off state of the third switch module. The load detection circuit is connected to the fourth switch module and is used to control the working state of the load drive circuit according to the on / off state of the fourth switch module.

6. The lighting load error reporting circuit as described in claim 2, characterized in that, Multiple LED load sub-circuits are respectively connected to the same load error sub-circuit. Each LED load sub-circuit includes an LED load module and a first resistor. The positive terminal of the LED load module is connected to the positive terminal of the power supply, and the negative terminal is grounded through the first resistor. The connection point between the LED load module and the first resistor is set as the load connection point. The load error reporting sub-circuit includes a third switch module, a fourth switch module, a first diode, a second resistor, and a second diode. The positive terminal of the power supply is connected to multiple load connection points via the forward-biased first diode, and the positive terminal of the power supply is also connected to the third switch module via the forward-biased second diode. The third switch module is connected to the fourth switch module and is used to control the on / off state of the third switch module according to the working state of the LED load module, and to control the on / off state of the fourth switch module according to the on / off state of the third switch module. The load detection circuit is connected to the fourth switch module and is used to control the working state of the load drive circuit according to the on / off state of the fourth switch module.

7. The lighting load error reporting circuit as described in claim 2, characterized in that, The LED load sub-circuit and the load error reporting sub-circuit are configured in a one-to-one correspondence. The LED load sub-circuit includes an LED load module and a first resistor. The positive terminal of the LED load module is connected to the positive terminal of the power supply through the first resistor, and the negative terminal is connected to the negative terminal of the power supply. The connection point between the LED load module and the first resistor is set as the load connection point. The load error reporting sub-circuit includes a third switch module, a fourth switch module, and a fifth switch module. The third switch module is connected to the load connection point and the fourth switch module respectively, and is connected to the LED load module through the first resistor. It is used to control the on / off state of the third switch module according to the working state of the LED load module, and to control the on / off state of the fourth switch module according to the on / off state of the third switch module. The fifth switch module is connected to the fourth switch module and the load detection circuit respectively, and is used to control the working state of the load detection circuit according to the on / off state of the fourth switch module, thereby controlling the working state of the load drive circuit.

8. The lighting load error reporting circuit as described in claim 7, characterized in that, Multiple LED load sub-circuits are respectively connected to the same load error sub-circuit. Each LED load sub-circuit includes an LED load module and a first resistor. The positive terminal of the LED load module is connected to the positive terminal of the power supply via the first resistor, and the negative terminal is connected to the negative terminal of the power supply. The connection point between the LED load module and the first resistor is designated as the load connection point. The load error reporting sub-circuit includes a third switch module, a fourth switch module, a fifth switch module, a first diode, a second resistor, and a second diode. The third switch module is grounded via a forward-biased second diode and a second resistor. The connection point between the second diode and the second resistor is connected to multiple load connection points via a reverse-biased second diode. The third switch module is connected to the fourth switch module and is used to control the on / off state of the third switch module according to the working state of the LED load module, and to control the on / off state of the fourth switch module according to the on / off state of the third switch module. The fifth switch module is connected to the fourth switch module and the load detection circuit respectively, and is used to control the working state of the load detection circuit according to the on / off state of the fourth switch module, thereby controlling the working state of the load drive circuit.

9. The lighting load error reporting circuit as described in claim 3, characterized in that, The constant current drive chip also includes a fault reporting pin, which is used to send a fault signal to the external main controller based on the detection signal output by the load detection circuit, or to control the drive external reporting circuit to send a fault signal to the external main controller. The drive external reporting circuit includes a sixth switch module, which is connected to the fault report pin and the external master controller respectively.

10. The lighting load error reporting circuit as described in claim 1, characterized in that, The power module includes a rectifier circuit, the two ends of which are connected to an external power supply and the load drive circuit, respectively.

Images