LED abnormity monitoring control circuit and monitoring controller

Abstract

The utility model discloses an LED abnormity monitoring control circuit and a monitoring controller, the LED abnormity monitoring control circuit comprises a power supply management circuit which comprises a positive connection end and a negative connection end, an LED lamp group is electrically connected between the positive connection end and the negative connection end, a sampling control unit is electrically connected with the LED lamp group, and the sampling control unit is electrically connected with the LED lamp group. The sampling control unit is configured to control the connection or disconnection of the LED lamp group and the power management circuit at at least one first switching frequency, so that the current passing through the LED lamp group is kept at a first threshold value; when it is monitored that the current passing through the LED lamp set is larger than or equal to a second threshold value, the LED lamp set and the power management circuit are controlled to be switched on or switched off at least at a second switching frequency, and the second threshold value is larger than the first threshold value, so that the sampling control unit is introduced, the current of the LED lamp set can be monitored in real time, protection measures are taken in time when the current is increased abnormally, and the service life of the LED lamp set is prolonged. And the LED lamp group is prevented from being damaged. And meanwhile, the current of the LED lamp group can be controlled, so that the LED lamp group keeps stable brightness output.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of lighting, especially relates to a control circuit and monitoring controller of LED abnormal monitoring. BACKGROUND

[0002] LED lighting equipment can provide higher brightness under lower power consumption, and has less impact on the environment, so it has been widely recognized and used in the market. In order to ensure that the LED equipment can run stably for a long time, various types of LED driving circuit gradually become one of its core components, which is used to provide stable voltage and current to ensure the normal light emission of LED.

[0003] The prior art usually adopts constant voltage power supply mode, that is, a constant working voltage is provided for LED row lights through a voltage stabilizing circuit. In this circuit, the power supply output is directly connected to a plurality of LED light strings through a voltage stabilizer, and each LED light string has the same input voltage.

[0004] Although the above-mentioned prior art design can provide stable voltage, it cannot effectively perform overcurrent protection in the face of abnormally increased current (for example, due to power supply fluctuation, LED aging or short circuit, etc.). UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a control circuit for LED abnormal monitoring, which aims to solve the problem that the existing LED driving circuit cannot effectively perform overcurrent protection.

[0006] To achieve the above-mentioned purpose, the utility model provides a control circuit for LED abnormal monitoring, which comprises:

[0007] A power management circuit comprising a positive connection end and a negative connection end, wherein the LED lamp group is electrically connected between the positive connection end and the negative connection end.

[0008] A sampling control unit electrically connected to the LED lamp group, wherein the sampling control unit is configured to control the conduction or turn-off of the LED lamp group and the power management circuit at at least one first switching frequency, so that the current passing through the LED lamp group is maintained at a first threshold value; and when it is monitored that the current passing through the LED lamp group is greater than or equal to a second threshold value, the conduction or turn-off of the LED lamp group and the power management circuit is controlled at at least one second switching frequency, wherein the second threshold value is greater than the first threshold value.

[0009] In some embodiments, the sampling control unit comprises:

[0010] A differential amplification circuit for collecting a current parameter between the LED lamp group and the power management circuit and generating an analog signal;

[0011] A main control unit electrically connected to the differential amplification circuit to receive the analog signal, the main control unit being configured to: control the turn-on or turn-off of the LED lamp group and the power management at at least one first switching frequency when the analog signal is greater than a first threshold value and less than a second threshold value; control the turn-on or turn-off of the LED lamp group and the power management circuit at at least one second switching frequency when the analog signal is greater than or equal to the second threshold value.

[0012] In some embodiments, the sampling control unit is electrically connected between the LED lamp group and the negative connection end;

[0013] The main control unit comprises:

[0014] A switching module comprising a control end and at least two turn-on ends, one turn-on end of the switching module being electrically connected to the LED lamp group;

[0015] The differential amplification circuit comprises a first collection end and a second collection end and a feedback end, the first collection end being electrically connected to another turn-on end of the switching module, and the second collection end being grounded;

[0016] A main control module for generating a PWM signal to adjust the switching module by receiving an analog signal from the feedback end of the differential amplification circuit;

[0017] The main control module is configured to generate a first PWM signal to adjust the turn-on duty cycle of the switching module when the analog signal is greater than the first threshold value and less than the second threshold value.

[0018] The main control module generates a second PWM signal to adjust the turn-on duty cycle of the switching module when the analog signal is greater than or equal to the second threshold value.

[0019] In some embodiments, the differential amplification circuit comprises:

[0020] An operational amplifier comprising a non-inverting input end, an inverting input end, and an output end;

[0021] A sampling resistor having one end electrically connected to the first collection end and the other end electrically connected to the second collection end;

[0022] The inverting input end of the operational amplifier is electrically connected to one end of the sampling resistor, the non-inverting input end of the operational amplifier is electrically connected to the other end of the sampling resistor, and the output end of the operational amplifier is electrically connected to the main control unit.

[0023] In some embodiments, the main control unit comprises a switch module and a main control module, the switch module comprises at least two conducting ends, one conducting end of the switch module is electrically connected with the LED lamp group; the main control module is used to generate a PWM signal to adjust the switch module by receiving an analog signal from a feedback end of the differential amplification circuit;

[0024] The differential amplification circuit comprises a first collection end, a second collection end and a feedback end, the first collection end is electrically connected with another conducting end of the switch module, and the second collection end is grounded; the differential amplification circuit comprises:

[0025] An operational amplifier, the operational amplifier comprises a non-inverting input end, an inverting input end and an output end;

[0026] A sampling resistor, one end of the sampling resistor is electrically connected with the first collection end, and the other end of the sampling resistor is electrically connected with the second collection end;

[0027] The inverting input end is electrically connected with one end of the sampling resistor, the non-inverting input end is electrically connected with the other end of the sampling resistor, and the output end of the operational amplifier is electrically connected with the main control unit.

[0028] In some embodiments, the differential amplification circuit further comprises:

[0029] An input resistor, one end of the input resistor is electrically connected with one end of the sampling resistor, and the other end of the input resistor is electrically connected with the inverting input end;

[0030] A balancing resistor, one end of the balancing resistor is electrically connected with the other end of the sampling resistor, and the other end of the balancing resistor is electrically connected with the non-inverting input end.

[0031] In some embodiments, the differential amplification circuit further comprises a negative feedback circuit, one end of the negative feedback circuit is electrically connected with the inverting input end, and the other end of the negative feedback circuit is electrically connected with the output end.

[0032] In some embodiments, the negative feedback circuit comprises a feedback resistor, one end of the feedback resistor is electrically connected with the output end, and the other end of the feedback resistor is electrically connected with the inverting input end.

[0033] In some embodiments, the main control module comprises:

[0034] An analog-to-digital converter, electrically connected with the feedback end, used to convert an analog signal fed back by the differential amplification circuit into a digital signal;

[0035] A main controller, electrically connected with the analog-to-digital converter, the main controller controls the switch module to work at least at a first frequency based on the digital signal.

[0036] In some embodiments, the sampling control unit is electrically connected between the LED lamp group and the positive connection end.

[0037] The utility model further proposes a monitoring controller, including the control circuit of LED abnormal monitoring as preceding embodiment.

[0038] The utility model discloses the technical scheme has the advantage that through sampling control unit real -time monitoring the current of LED lamp group, sampling control unit can control LED lamp group and power management circuit's switch on or off with at least one first switch frequency, make the current that flows through LED lamp group stabilize in the first threshold range that sets, realize constant current control, in the constant current process, sampling control unit continues monitoring the current variation of LED lamp group, when the current reaches or exceeds the second threshold value, sampling control unit further adjusts or off the connection of LED lamp group and power management circuit through the second switch frequency, provides reliable dynamic overcurrent protection, prevents the LED damage caused by current anomaly, reduces the influence of current fluctuation to LED life, improves the security of system. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is module electric connection schematic drawing for the control circuit of LED abnormal monitoring of an embodiment of the utility model;

[0040] Figure 2 It is circuit diagram for the control circuit of LED abnormal monitoring of an embodiment of the utility model.

[0041] BRIEF DESCRIPTION OF DRAWINGS

[0042] 100, power management circuit;A1, positive connection end;A2, negative connection end;

[0043] 110, LED lamp group;

[0044] 200, sampling control unit;

[0045] 210, difference amplification circuit;A3, first acquisition end;A4, second acquisition end;A5, feedback end;U1, operational amplifier;R1, sampling resistance;R2, input resistance;R3, balance resistance;R4, negative feedback circuit;

[0046] 220, main control unit;222, switch module;A6, control end;A7, one conduction end;A8, another conduction end;224, main control module;U2, analog-digital converter;U3, main controller.

[0047] The realization of the utility model, functional characteristics and advantages will be further explained with reference to the drawings. DETAILED DESCRIPTION

[0048] The schemes in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0049] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0050] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or can have a middle element present at the same time. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or can have a middle element present at the same time.

[0051] In addition, the descriptions of "first", "second", etc. in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0052] The existing LED driving circuit usually has deficiencies in dealing with abnormal increase of current (for example, due to power fluctuation, LED aging or short circuit, etc.), and cannot effectively perform overcurrent protection. In particular, when the current abnormally increases, the conventional circuit cannot respond and adjust in time, which may cause the LED lamp set to overheat or even be damaged. Therefore, the present application proposes an improved LED abnormal monitoring control circuit, which aims to solve the above problems and provide reliable current monitoring and control mechanism, thereby improving the safety and service life of the LED lamp set. For details, please refer to Figure 1 The present application embodiment proposes an LED abnormal monitoring control circuit for current monitoring and control of the LED lamp set 110, which comprises:

[0053] The power management circuit 100 comprises a positive connection end A1 and a negative connection end A2, and the LED lamp set 110 is electrically connected between the positive connection end A1 and the negative connection end A2.

[0054] The sampling control unit 200 is electrically connected to the LED lamp group 110. The sampling control unit 200 is configured to control the on or off of the LED lamp group 110 and the power management circuit 100 at at least one first switching frequency, so as to keep the current through the LED lamp group 110 within a first threshold value. When the current through the LED lamp group 110 is detected to be greater than or equal to a second threshold value, the sampling control unit 200 controls the on or off of the LED lamp group 110 and the power management circuit 100 at at least one second switching frequency, wherein the second threshold value is greater than the first threshold value.

[0055] In the embodiment, the control circuit for LED abnormality monitoring includes the power management circuit 100, the sampling control unit 200 and the LED lamp group 110.

[0056] Specifically, the power management circuit 100 includes a positive connection end A1 and a negative connection end A2, and the LED lamp group 110 is electrically connected between the positive connection end A1 and the negative connection end A2. The power management circuit 100 provides stable voltage and current for the LED lamp group 110, ensuring the normal operation of the system. In the embodiment, the power management circuit 100 can use a direct current power supply to provide a constant direct current voltage.

[0057] The sampling control unit 200 is electrically connected to the LED lamp group 110 and is responsible for real-time monitoring of the current through the LED lamp group 110. In the embodiment, the sampling control unit 200 is configured to control the on or off of the LED lamp group 110 and the power management circuit 100 at at least one first switching frequency, so as to keep the current through the LED lamp group 110 within a first threshold value. When the current through the LED lamp group 110 is detected to be greater than or equal to a second threshold value, the sampling control unit 200 controls the on or off of the circuit at a second switching frequency. The sampling control unit 200 can use a variety of alternatives, such as sampling current through a shunt resistor, measuring current through a Hall sensor, or achieving accurate sampling through other current detection modules.

[0058] In the embodiment, the LED lamp group 110 can be composed of one or more LED lamps in series or in parallel. The number and type of the LED lamp group 110 can be flexibly selected according to different specific application scenarios. For example, high-power LED beads can be used to improve overall brightness, or multiple low-power LED combinations can be used to achieve uniform light emission. The specific number and arrangement of the LED lamp group 110 can be determined according to the required light intensity and illumination area.

[0059] In the embodiment, the control circuit for LED abnormality monitoring can have two working modes, such as an overcurrent protection mode and a constant current mode.

[0060] In the over-current protection mode, when the sampling control unit 200 monitors that the current passing through the LED light set 110 is greater than or equal to the second threshold value (e.g., the second threshold value is 2V, and the first threshold value is 1V), the sampling control unit 200 controls the turn-on or turn-off of the LED light set 110 and the power management circuit 100 at the second switching frequency to attempt to reduce the current to the target threshold value, or directly disconnect the LED light set 110 and the power management circuit 100. After disconnecting for a predetermined period of time, the sampling control unit 200 attempts to turn on the LED light set 110 and the power management circuit 100 again. If the detected current is less than the second threshold value and greater than the first threshold value at this time, the circuit enters the constant current mode; if the detected current is still greater than the second threshold value, the sampling control unit 200 will disconnect the circuit again.

[0061] In the constant current mode, the sampling control unit 200 controls the turn-on of the LED light set 110 and the power management circuit 100 at the first switching frequency, so that the current passing through the LED light set 110 is equal to the first threshold value (allowing a certain positive and negative difference). In this mode, the LED light set 110 works at a preset brightness, and the sampling control unit 200 continuously monitors the current and makes necessary adjustments to ensure that the LED light set 110 maintains stable light output. If the current passing through the LED light set 110 is suddenly increased and exceeds the second threshold value in the constant current mode, the sampling control unit 200 will switch to the protection mode to disconnect the LED light set 110 and the power management circuit 100, preventing damage to the LED light set 110. In the protection mode, the sampling control unit 200 will keep the LED light set 110 and the power management circuit 100 disconnected, while continuously monitoring the change of the current. If the current remains outside the safe range for a period of time, the sampling control unit 200 will continue to remain disconnected to ensure that the LED light set 110 is not further damaged. Once the sampling control unit 200 detects that the current has returned to the safe range (e.g., below the first threshold value), it will attempt to turn on the circuit again to restore normal operation of the system. In addition, before resuming the turn-on, the sampling control unit 200 can perform multiple verifications to ensure that the current is stable within the safe range, thereby avoiding potential damage caused by frequent switching. This protection and recovery mechanism ensures the reliability and service life of the LED light set 110.

[0062] The beneficial effects of the technical scheme of the utility model lie in that: by introducing the sampling control unit 200, the current of the LED lamp set 110 is monitored in real time, the sampling control unit 200 can control the turn-on or turn-off of the LED lamp set 110 and the power management circuit 100 at least one first switching frequency, so that the current flowing through the LED lamp set 110 is stabilized in the set first threshold range to realize constant current control; during the constant current process, the sampling control unit 200 continuously monitors the current change of the LED lamp set 110, when the current reaches or exceeds the second threshold, the sampling control unit 200 further adjusts or turns off the connection of the LED lamp set 110 and the power management circuit through at least one second switching frequency, reliable dynamic overcurrent protection is provided, LED damage caused by abnormal current is prevented, the influence of current fluctuation on the service life of the LED is reduced, and the safety of the system is improved.

[0063] Reference Figure 2 In the embodiment, the sampling control unit 200 comprises:

[0064] The differential amplification circuit 210 is used for collecting the current parameters between the LED lamp set 110 and the power management circuit 100, and generating an analog signal;

[0065] The main control unit 220 is electrically connected with the differential amplification circuit 210 to receive the analog signal, and the main control unit 220 is configured to: when the analog signal is greater than the first threshold and less than the second threshold, control the turn-on or turn-off of the LED lamp set 110 and the power management at least one first switching frequency; when the analog signal is greater than or equal to the second threshold, control the turn-on or turn-off of the LED lamp set 110 and the power management circuit 100 at least one second switching frequency.

[0066] In the embodiment, the differential amplification circuit 210 is used for collecting the current parameters between the LED lamp set 110 and the power management circuit 100 and converting them into an analog signal for use by the main control unit 220. The main function of the differential amplification circuit 210 is to convert the current signal passing through the LED lamp set 110 into a voltage signal, which is the analog signal used to reflect the actual current change. In addition to the current collection function, the differential amplification circuit 210 also has a filtering function, which is particularly important in scenarios where the current fluctuates frequently. Since the sampling control unit 200 is directly connected between the LED lamp set 110 and the negative connection end A2, the current is adjusted by controlling the turn-on and turn-off of the LED lamp set 110 and the negative connection end A2, so the current may fluctuate during switching. These fluctuations may be caused by transient current spikes or the reaction of parasitic inductance generated by switching operation, and the differential amplification circuit 210 can attenuate these high-frequency components through a filter to obtain a relatively smooth current signal.

[0067] By combining the differential amplification circuit 210 with the main control unit 220, the circuit realizes the dual functions of accurate current regulation and overcurrent protection for the LED lamp set 110. Specifically, the analog signal generated by the differential amplification circuit 210 reflects the real-time current state of the LED lamp set 110, and the main control unit 220 adjusts the working state of the LED lamp set 110 flexibly according to the signal. When the voltage value of the analog signal is between the first threshold value and the second threshold value, the main control unit 220 controls the on or off between the LED lamp set 110 and the power management circuit 100 at least one first switching frequency, so as to realize accurate current regulation and ensure the efficient operation of the LED lamp set 110 in a constant current state; when the voltage value of the analog signal reaches or exceeds the second threshold value, the main control unit 220 quickly responds at least one second switching frequency, effectively limits the current rise by adjusting the on or off of the circuit, and provides dynamic overcurrent protection.

[0068] This combination effect makes the circuit not only able to output stably under normal conditions and maintain the constant current operation of the LED lamp set, but also able to quickly respond under abnormal conditions and prevent the LED lamp set 110 from being damaged due to overcurrent, thereby improving the reliability, safety and service life of the system.

[0069] The sampling control unit 200 is directly connected to the LED lamp set 110 and the negative connection end A2, and is responsible for adjusting the current by controlling the on or off of the LED lamp set 110 and the negative connection end A2. The LED lamp set 110 can be composed of one or more LEDs in series or parallel, and can be flexibly configured according to the requirements of specific application scenarios. In actual operation, the current of the LED lamp set 110 is sampled by the differential amplification circuit 210 and converted into an analog signal, which is judged and controlled by the main control unit 220.

[0070] During control, the on or off operation between the LED lamp set 110 and the negative connection end A2 will cause sudden changes in current, which usually appear in the form of high-frequency noise and may affect the stability of the system. The low-pass filter in the differential amplification circuit 210 suppresses these high-frequency noises through the combination of resistance and capacitance elements. Specifically, when high-frequency components are generated due to current changes, these components will be attenuated by the low-pass filter, and only the low-frequency part of the signal can pass through the filter, so that the output analog signal is more stable. In this way, the differential amplification circuit 210 can effectively eliminate the transient current fluctuations caused by switching operations, ensuring that the main control unit 220 makes more accurate judgments on the system state, thereby improving the stability and service life of the LED lamp set 110.

[0071] The embodiment converts the current signal into an analog voltage signal by introducing the differential amplification circuit 210, and combines the filtering function to suppress high-frequency noise, thereby ensuring that the signal received by the main control unit 220 is more stable and reliable.

[0072] With reference to the foregoing Figure 2 In the embodiment, the sampling control unit 200 is electrically connected between the LED lamp group 110 and the negative connection end A2.

[0073] The main control unit 220 includes:

[0074] The switch module 222 includes a control end A6 and at least two conduction ends, and one conduction end A7 of the switch module 222 is electrically connected to the LED lamp group 110.

[0075] The differential amplification circuit 210 includes a first collection end A3, a second collection end A4, and a feedback end A5, the first collection end A3 is electrically connected to another conduction end A8 of the switch module 222, and the second collection end A4 is grounded.

[0076] The main control module 224 is configured to generate a PWM signal to adjust the switch module 222 by receiving an analog signal from the feedback end A5 of the differential amplification circuit 210.

[0077] The main control module 224 is configured to generate a first PWM signal to adjust the conduction duty cycle of the switch module 222 when the analog signal is greater than a first threshold value and less than a second threshold value.

[0078] The main control module 224 is configured to generate a second PWM signal to adjust the conduction duty cycle of the switch module 222 when the analog signal is greater than or equal to the second threshold value.

[0079] In the embodiment, the LED abnormality monitoring control circuit includes: a sampling control unit 200, a main control unit 220 (including a switch module 222, a differential amplification circuit 210, and a main control module 224), a power management circuit 100, and an LED lamp group 110.

[0080] Specifically, the sampling control unit 200 is electrically connected between the LED lamp group 110 and the negative connection end A2, and is mainly responsible for real-time sampling of the current of the LED lamp group 110. The sampling control unit 200 transmits current change information to the main control unit 220 by real-time detection of the current of the LED lamp group 110, so that the system can make timely adjustments to maintain the normal operation state of the LED lamp group 110. The main control unit 220 includes a switch module 222, a differential amplification circuit 210, and a main control module 224.

[0081] The switch module 222 includes a control terminal A6 and at least two conducting terminals, one of which, A7, is electrically connected to the LED lamp group 110, and the other conducting terminal, A8, is electrically connected to the first acquisition terminal A3 of the differential amplifier circuit 210. The switch module 222 receives a PWM signal generated by the main control module 224 through the control terminal A6 to control the conduction state, thereby realizing the current regulation of the LED lamp group 110.

[0082] The differential amplifier circuit 210 includes a first acquisition terminal A3, a second acquisition terminal A4, and a feedback terminal A5. The first acquisition terminal A3 is electrically connected to the other conducting terminal A8 of the switch module 222, and the second acquisition terminal A4 is grounded. The differential amplifier circuit 210 is used to acquire the current parameters between the LED lamp group 110 and the power management circuit 100 and convert them into analog signals. The feedback terminal A5 is used to transmit the converted analog signal to the main control module 224. In this way, the differential amplifier circuit 210 can convert the current fluctuation information in the system into a voltage signal that can be processed by the main control module 224, providing basic data for subsequent control decisions.

[0083] The main control module 224 receives the analog signal from the feedback terminal A5 of the differential amplifier circuit 210 and generates a corresponding PWM signal based on the signal to adjust the operating state of the switching module 222. When the analog signal is greater than a first threshold but less than a second threshold, the main control module 224 generates a first PWM signal to control the duty cycle of the switching module 222, thereby maintaining a constant current output of the LED lamp group 110 and avoiding excessively high or low current. When the analog signal is greater than or equal to the second threshold, the main control module 224 generates a second PWM signal to reduce the duty cycle of the switching module 222 or directly turn off the switching module 222 to prevent the current from rising further and ensure the safety of the LED lamp group 110.

[0084] During normal operation, the sampling control unit 200 continuously collects the current passing through the LED group 110 and transmits the collected current signal to the differential amplifier circuit 210. The differential amplifier circuit 210 converts the current signal into a voltage signal (i.e., an analog signal) and transmits it to the main control module 224 through the feedback terminal A5. The main control module 224 determines the operating state of the LED group 110 based on the magnitude of the analog signal, thereby deciding which type of PWM signal to generate.

[0085] When the analog signal received by the main control module 224 is greater than the first threshold but less than the second threshold, it indicates that the current of the LED lamp group 110 is within a reasonable range, but further adjustment is needed to maintain a constant current. At this time, the main control module 224 generates a first PWM signal to adjust the duty cycle of the switching module 222, thereby achieving fine-tuning of the current and ensuring that the LED lamp group 110 operates in constant current mode.

[0086] When the main control module 224 detects that the analog signal is greater than or equal to the second threshold, it means that the current of the LED lamp group 110 has exceeded the safe range. At this time, the main control module 224 generates a second PWM signal to reduce the duty cycle of the switching module 222, or directly turn off the switching module 222, to prevent the LED lamp group 110 from being damaged due to excessive current. In this situation, the main control module 224 will continuously monitor the current change, and when the current returns to the safe range, it will readjust the PWM signal to restore normal operation.

[0087] The control circuit design in this embodiment enables precise adjustment and protection of the LED lamp group 110 current. Under normal operating conditions, the system maintains stable operation of the LED lamp group 110 in constant current mode, improving luminous efficiency and lifespan. When the current exceeds the safe range, the system can promptly switch to protection mode to prevent damage to the LED lamp group 110. Furthermore, the synergistic effect of the differential amplifier circuit 210 and the main control module 224 effectively suppresses the impact of current fluctuations, ensuring the overall stability and reliability of the system.

[0088] Continue reading Figure 2 In this embodiment, the differential amplifier circuit 210 includes:

[0089] Operational amplifier U1 includes a non-inverting input terminal, an inverting input terminal, and an output terminal;

[0090] The sampling resistor R1 is electrically connected at one end to the first acquisition terminal A3 and at the other end to the second acquisition terminal A4.

[0091] The inverting input terminal is electrically connected to one end of the sampling resistor R1, the non-inverting input terminal is electrically connected to the other end of the sampling resistor R1, and the output terminal of the operational amplifier U1 is electrically connected to the main control unit 220.

[0092] In this embodiment, operational amplifier U1 is the core component of differential amplifier circuit 210, used to amplify the voltage difference across sampling resistor R1, thereby converting the current signal into an analog voltage signal. Operational amplifier U1 includes a non-inverting input terminal, an inverting input terminal, and an output terminal. The non-inverting and inverting input terminals are respectively connected to the two ends of sampling resistor R1 to obtain the voltage difference of the current across sampling resistor R1. By using differential amplification, the influence of common-mode noise can be eliminated, enhancing the detection capability of small signals.

[0093] The sampling resistor R1 is used to convert the current signal of the LED group 110 into a voltage signal. One end of it is electrically connected to the first acquisition terminal A3, and the other end is electrically connected to the second acquisition terminal A4. By applying current to the sampling resistor R1, the resulting voltage difference can reflect the magnitude of the current.

[0094] In this embodiment, the inverting input of operational amplifier U1 is electrically connected to one end of sampling resistor R1, the non-inverting input is electrically connected to the other end of sampling resistor R1, and the output of operational amplifier U1 is electrically connected to main control unit 220. This connection method enables differential amplifier circuit 210 to accurately convert the current change passing through LED lamp group 110 into a voltage signal for use by main control unit 220.

[0095] In the LED anomaly monitoring and control circuit, the sampling control unit 200 monitors the current passing through the LED group 110 in real time and converts it into a voltage signal. The differential amplifier circuit 210 uses a combination of sampling resistor R1 and operational amplifier U1 to achieve this process.

[0096] When current flows through the sampling resistor R1, a voltage difference proportional to the current will be generated across the sampling resistor R1.

[0097] The non-inverting and inverting input terminals of operational amplifier U1 are connected to the two ends of sampling resistor R1, respectively. Operational amplifier U1 amplifies the voltage difference across sampling resistor R1, thereby converting the current signal into a voltage signal.

[0098] Operational amplifier U1 transmits the amplified voltage signal from its output to the main control unit 220. This voltage signal reflects the actual current flowing through the LED group 110.

[0099] The main control unit 220 generates a PWM signal based on the received analog voltage signal to adjust the conduction state of the LED lamp group 110, thereby realizing the current control and adjustment of the LED lamp group 110.

[0100] Through the differential amplifier circuit 210 design in this embodiment, the LED anomaly monitoring and control circuit can achieve accurate sampling and amplification of the current, effectively improving the system's monitoring accuracy of the LED lamp group 110's operating status. Simultaneously, the combination of operational amplifier U1 and sampling resistor R1 suppresses common-mode noise, thereby ensuring that the signal received by the main control unit 220 is more stable and accurate.

[0101] Continue reading Figure 2 In this embodiment, the differential amplifier circuit 210 further includes:

[0102] The input resistor R2 is connected at one end to one end of the sampling resistor R1; the other end of the input resistor R2 is connected to the inverting input terminal.

[0103] The balancing resistor R3 is connected at one end to the other end of the sampling resistor R1, and at the other end to the non-inverting input terminal.

[0104] In this embodiment, the LED anomaly monitoring and control circuit further optimizes the design of the differential amplifier circuit 210 by introducing an input resistor R2 and a balancing resistor R3 to improve the system's accuracy and anti-interference capability. The differential amplifier circuit 210 consists of an operational amplifier U1, a sampling resistor R1, an input resistor R2, and a balancing resistor R3.

[0105] Specifically, one end of the input resistor R2 is electrically connected to one end of the sampling resistor R1, and the other end is electrically connected to the inverting input terminal of the operational amplifier U1. The function of the input resistor R2 is to limit the current of the input signal, protect the input terminal of the operational amplifier U1, and prevent damage caused by excessive input current. At the same time, the input resistor R2 can also form a resistor network matched with the balancing resistor R3 to reduce the system offset voltage.

[0106] One end of the balancing resistor R3 is electrically connected to the other end of the sampling resistor R1, and the other end is electrically connected to the non-inverting input terminal of the operational amplifier U1. The function of the balancing resistor R3 is to maintain the symmetry of the input impedance, thereby improving the common-mode rejection ratio (CMRR) of the differential amplifier circuit 210. When the input impedance is symmetrical, the common-mode signal generated by external noise signals at the non-inverting and inverting input terminals can be effectively suppressed, making the differential amplifier circuit 210 less sensitive to common-mode noise and improving the accuracy and stability of the signal.

[0107] In actual operation, the sampling resistor R1 generates a voltage difference proportional to the current by monitoring the current flowing through the LED group 110. The input resistor R2 and the balancing resistor R3 are connected across the sampling resistor R1 to ensure the symmetry of the resistor network.

[0108] When current passes through the sampling resistor R1, a voltage difference is generated across the sampling resistor R1. This voltage difference reflects the magnitude of the current in the LED group 110.

[0109] The input resistor R2 transmits the voltage signal at one end of the sampling resistor R1 to the inverting input of the operational amplifier U1, while the balancing resistor R3 transmits the voltage signal at the other end to the non-inverting input.

[0110] Operational amplifier U1 amplifies the voltage difference between its non-inverting and inverting inputs to generate an output voltage signal. Since the input resistor R2 and the balancing resistor R3 form a symmetrical resistor network, operational amplifier U1 can effectively suppress common-mode noise in the input signal, thus ensuring the accuracy of the output signal.

[0111] Common-mode noise mainly originates from power supply fluctuations and environmental interference, but due to the presence of input resistor R2 and balancing resistor R3, this noise is canceled out at the input of operational amplifier U1 and will not affect the output signal in the end.

[0112] The output of operational amplifier U1 is connected to the main control unit 220, and the generated analog voltage signal reflects the current in the LED group 110. The main control unit 220 generates a PWM signal based on this signal to control the on and off states of the LED group 110, thereby achieving precise control of the LED current. By introducing input resistor R2 and balancing resistor R3, the differential amplifier circuit 210 in this embodiment can effectively improve the detection accuracy of the LED group 110 current and the system's anti-interference capability. The use of input resistor R2 not only protects the input of operational amplifier U1 but also, in conjunction with balancing resistor R3, forms a symmetrical input impedance structure, improving common-mode rejection capability.

[0113] Continue reading Figure 2 In this embodiment, the differential amplifier circuit 210 further includes a negative feedback circuit R4, one end of which is electrically connected to the inverting input terminal and the other end is electrically connected to the output terminal.

[0114] In this embodiment, the differential amplifier circuit 210 of the LED anomaly monitoring and control circuit further incorporates a negative feedback circuit R4 to improve the performance and stability of the operational amplifier U1. The differential amplifier circuit 210 includes the operational amplifier U1, sampling resistor R1, input resistor R2, balancing resistor R3, and negative feedback circuit R4.

[0115] Specifically, one end of the negative feedback circuit R4 is electrically connected to the inverting input terminal of operational amplifier U1, and the other end is electrically connected to the output terminal of operational amplifier U1. The main function of the negative feedback circuit R4 here is to adjust the gain of operational amplifier U1, improve the linearity of the circuit, reduce distortion, and make the output more stable.

[0116] The negative feedback circuit R4 feeds a portion of the output signal back to the inverting input, and the operational amplifier U1 adjusts the voltage difference at the input based on the feedback signal. This method allows for precise control of the amplifier gain, ensuring that the voltage amplification factor remains within the expected range and preventing excessive amplifier gain that could cause distortion or oscillation.

[0117] Furthermore, negative feedback makes the amplifier's output more linear, ensuring the output signal is proportional to the input signal and reducing nonlinear distortion. Negative feedback also flattens the circuit's frequency response, improving the stability of the entire differential amplifier circuit 210. Simultaneously, negative feedback effectively reduces the system's total distortion and noise, allowing the operational amplifier U1 to quickly adjust its output and maintain a stable output voltage when the input signal changes. This is particularly important for precise LED current control, as it ensures the main control unit 220 receives an accurate and stable current signal, enabling more precise control.

[0118] During operation, the sampling resistor R1 converts the current signal of the LED group 110 into a voltage signal, which is then amplified by the operational amplifier U1. The negative feedback circuit R4 connects the inverting input and output of the operational amplifier U1, forming a closed-loop control system. The operational amplifier U1 continuously adjusts the input difference based on the feedback signal, stabilizing the output voltage and ensuring that the current of the LED group 110 remains within the set range.

[0119] By introducing negative feedback circuit R4, the differential amplifier circuit 210 in this embodiment achieves precise control over the gain of operational amplifier U1 and greatly improves the linearity and stability of the circuit. Simultaneously, the use of negative feedback effectively reduces signal distortion and noise, making the current control of the LED lamp group 110 more precise and reliable.

[0120] Furthermore, the negative feedback circuit R4 includes a feedback resistor, one end of which is electrically connected to the output terminal and the other end is electrically connected to the inverting input terminal.

[0121] Continue reading Figure 2 In this embodiment, the main control module 224 includes:

[0122] The analog-to-digital converter U2 is electrically connected to the feedback terminal A5 and is used to convert the analog signal fed back by the differential amplifier circuit 210 into a digital signal.

[0123] The main controller U3 is electrically connected to the analog-to-digital converter U2. The main controller U3 controls the switching module 222 to operate based on digital signals at least at a first frequency.

[0124] In this embodiment, the main control module 224 of the LED anomaly monitoring and control circuit further includes an analog-to-digital converter U2 (ADC) and a main controller U3 to achieve more precise signal processing and control.

[0125] Specifically, the analog-to-digital converter U2 is used to convert the analog signal fed back from the differential amplifier circuit 210 into a digital signal. The input terminal of the analog-to-digital converter U2 is electrically connected to the feedback terminal A5 of the differential amplifier circuit 210. By converting the analog signal into a digital signal, the ADC can represent the current signal in the LED group 110 in digital form, facilitating subsequent digital processing.

[0126] The main controller U3 is connected to the analog-to-digital converter U2 and receives the digital signals converted by the converter. Based on these digital signals, the main controller U3 determines the operating state of the LED group 110 and controls the operating state of the switching module 222 at at least one first frequency. According to the magnitude of the digital signals, the main controller U3 generates corresponding PWM signals to adjust the switching module 222, thereby achieving precise control of the current of the LED group 110.

[0127] In some embodiments, the sampling control unit 200 can be electrically connected between the LED light group 110 and the positive connection terminal A1.

[0128] In this embodiment, the sampling control unit 200 of the LED anomaly monitoring and control circuit can be configured to be connected between the LED lamp group 110 and the positive connection terminal A1, thereby realizing high-end detection. This high-end detection method is different from the low-end detection in the previous embodiment, but it can still effectively monitor the current of the LED lamp group 110.

[0129] In this embodiment, the sampling control unit 200 is connected between the LED group 110 and the positive connection terminal A1. This means that the sampling resistor R1 is located between the power supply voltage and the LED group 110, used to collect current signals and provide them to the subsequent control unit for processing. This high-side detection method can directly measure the current flowing from the power supply to the LED group 110, avoiding interference that may be caused by ground voltage fluctuations, and is more suitable for use in application scenarios where the ground wire is unstable in the current path.

[0130] When current flows through the LED group 110, the sampling control unit 200 acquires a voltage signal across the sampling resistor R1 between the positive connection terminal A1 and the LED group 110. The voltage difference across the sampling resistor R1 reflects the magnitude of the current flowing through the LED group 110.

[0131] The sampling control unit 200 transmits the signal to the main control unit 220, which generates a PWM signal to adjust the current of the LED group 110 to ensure its stable operation.

[0132] By employing a high-end detection method, the control circuit in this embodiment achieves more accurate and stable current monitoring. High-end detection reduces the impact of voltage fluctuations on the ground wire on the sampling results, making it particularly suitable for LED driver applications requiring high precision and stability. Compared to low-end detection, high-end detection offers higher anti-interference capabilities in certain application scenarios, further improving the operational reliability of the LED lamp group 110.

[0133] This utility model further proposes a monitoring controller, including a control circuit for LED anomaly monitoring as described in the foregoing embodiments. The specific structure of the control circuit for LED anomaly monitoring is as described in the above embodiments. Since this monitoring controller adopts all the technical solutions of all the above embodiments, it has at least all the technical effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0134] In this embodiment, the monitoring controller can be used as another form of the aforementioned LED abnormality monitoring and control circuit. It can be implemented in the form of a device or chip, which is convenient to be assembled into other circuits to increase the monitoring and control functions of the LED light group 110.

[0135] Specifically, the sampling control unit 200 includes an input terminal and an output terminal. The input terminal is connected to the LED light group 110 and is used to collect the current signal passing through the LED light group 110 in real time. The output terminal is connected to the power management circuit 100. The sampling control unit 200 adjusts the current of the LED light group 110 according to its operating state to ensure its stable operation.

[0136] The sampling control unit 200 is configured to control the current passing through the LED lamp group 110 at at least one first switching frequency to keep it within a predetermined first threshold range. When the current of the LED lamp group 110 is detected to be greater than or equal to a second threshold, the sampling control unit 200 switches to at least one second switching frequency to adjust the current to ensure that the LED lamp group 110 is not affected by overcurrent.

[0137] The monitoring controller can be packaged as a chip, making it easy to integrate into different circuits. This design enables rapid upgrades to existing LED lighting systems, adding intelligent monitoring and control functions for the LED light group 110 without requiring complex modifications to existing circuits.

[0138] Furthermore, the monitoring controller in this embodiment can be used as a standalone module, making it easy to integrate into other circuits. Whether for newly designed circuits or for retrofitting existing circuits, this monitoring controller can be easily integrated, providing reliable current monitoring and regulation functions.

[0139] In summary, the monitoring controller in this embodiment can provide accurate current monitoring and control for the LED light group 110 through modularization and chip-based design. It has strong integration and flexibility, is suitable for various LED lighting application scenarios, and significantly improves the performance and reliability of the LED light group 110.

[0140] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A control circuit for LED anomaly monitoring for current monitoring and control of LED lamp banks, comprising: The LED anomaly monitoring control circuit comprises: a power management circuit comprising a positive connection end and a negative connection end, the LED lamp group being electrically connected between the positive connection end and the negative connection end; a sampling control unit electrically connected to the LED lamp group, the sampling control unit being configured to control the LED lamp group and the power management circuit to be turned on or turned off at at least one first switching frequency so that the current passing through the LED lamp group is maintained at a first threshold value, and to control the LED lamp group and the power management circuit to be turned on or turned off at at least one second switching frequency when it is monitored that the current passing through the LED lamp group is greater than or equal to a second threshold value, wherein the second threshold value is greater than the first threshold value.

2. The control circuit for LED anomaly monitoring according to claim 1, characterized in that, The sampling control unit comprises: a differential amplification circuit for collecting the current parameter between the LED lamp group and the power management circuit and generating an analog signal; a main control unit electrically connected to the differential amplification circuit to receive the analog signal, the main control unit being configured to control the LED lamp group and the power management to be turned on or turned off at at least one first switching frequency when the analog signal is greater than a first threshold value and less than a second threshold value, and to control the LED lamp group and the power management circuit to be turned on or turned off at at least one second switching frequency when the analog signal is greater than or equal to the second threshold value.

3. The LED anomaly monitoring control circuit according to claim 2, wherein the sampling control unit is electrically connected between the LED lamp group and the negative connection end; the main control unit comprises a switching module and a main control module, the switching module comprising a control end and at least two turn-on ends, one of the turn-on ends of the switching module being electrically connected to the LED lamp group, and the main control module being configured to generate a PWM signal to adjust the switching module by receiving the analog signal from the feedback end of the differential amplification circuit; the differential amplification circuit comprises a first collection end, a second collection end and a feedback end, the first collection end being electrically connected to the other turn-on end of the switching module, and the second collection end being grounded; wherein the main control module is configured to generate a first PWM signal to adjust the duty cycle of the switching module when the analog signal is greater than the first threshold value and less than the second threshold value, and to generate a second PWM signal to adjust the duty cycle of the switching module when the analog signal is greater than or equal to the second threshold value. The differential amplification circuit comprises:

4. The control circuit for LED anomaly monitoring according to claim 3, characterized in that, an operational amplifier comprising a non-inverting input end, an inverting input end and an output end; a sampling resistor having one end electrically connected to the first collection end and the other end electrically connected to the second collection end; wherein the inverting input end of the operational amplifier is electrically connected to one end of the sampling resistor, the non-inverting input end of the operational amplifier is electrically connected to the other end of the sampling resistor, and the output end of the operational amplifier is electrically connected to the main control unit. ​ 5. The control circuit for LED anomaly monitoring according to claim 2, wherein The main control unit comprises a switch module and a main control module, the switch module comprises at least two conducting ends, one conducting end of the switch module is electrically connected with the LED lamp group; the main control module is used for generating a PWM signal to adjust the switch module by receiving an analog signal from a feedback end of the differential amplification circuit; The differential amplification circuit comprises a first collecting end, a second collecting end and a feedback end, the first collecting end is electrically connected with another conducting end of the switch module, and the second collecting end is grounded; the differential amplification circuit comprises: An operational amplifier, the operational amplifier comprises a non-inverting input end, an inverting input end and an output end; A sampling resistor, one end of the sampling resistor is electrically connected with the first collecting end, and the other end of the sampling resistor is electrically connected with the second collecting end; Wherein, the inverting input end is electrically connected with one end of the sampling resistor, the non-inverting input end is electrically connected with the other end of the sampling resistor, and the output end of the operational amplifier is electrically connected with the main control unit.

6. The control circuit for LED anomaly monitoring according to claim 4, wherein The differential amplification circuit further comprises: An input resistor, one end of the input resistor is electrically connected with one end of the sampling resistor; the other end of the input resistor is electrically connected with the inverting input end; A balance resistor, one end of the balance resistor is electrically connected with the other end of the sampling resistor, and the other end of the balance resistor is electrically connected with the non-inverting input end.

7. The control circuit for LED anomaly monitoring according to claim 4, wherein The differential amplification circuit further comprises a negative feedback circuit, one end of the negative feedback circuit is electrically connected with the inverting input end, and the other end of the negative feedback circuit is electrically connected with the output end.

8. The control circuit for LED anomaly monitoring according to claim 7, characterized in that, The negative feedback circuit comprises a feedback resistor, one end of the feedback resistor is electrically connected with the output end, and the other end of the feedback resistor is electrically connected with the inverting input end.

9. The control circuit for LED anomaly monitoring according to claim 3, wherein, The main control module comprises: An analog-to-digital converter, electrically connected with the feedback end, used for converting the analog signal fed back by the differential amplification circuit into a digital signal; A main controller, electrically connected with the analog-to-digital converter, the main controller controls the switch module to work at least at a first frequency based on the digital signal.

10. The control circuit for LED anomaly monitoring according to claim 2, wherein, The sampling control unit is electrically connected between the LED lamp group and the positive connection end.

11. A monitoring controller, characterized by The control circuit comprises the LED abnormality monitoring circuit according to any one of claims 1 to 10.

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