Marking lamp circuit and marking lamp

Abstract

The utility model relates to the technical field of sign lamps, and provides a sign lamp circuit and a sign lamp, and the sign lamp circuit comprises an input rectification circuit which is used for carrying out the voltage reduction and filtering of an input direct current, and then outputting a stable voltage; the charging management circuit is connected with the voltage output end of the input rectifying circuit and is used for outputting voltage to carry out constant-voltage charging on a standby battery; the protection circuit is connected with the voltage output end of the charging management circuit and used for being connected with an LED lamp and achieving overvoltage protection; and the control circuit is respectively connected with the input rectifying circuit, the charging management circuit and the protection circuit. According to the marker lamp circuit provided by the invention, the technical problem that the marker lamp circuit possibly ignites explosive gas due to electric spark or heat effect in the related technology can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of sign lamps, and in particular to a sign lamp circuit and a sign lamp. Background Art

[0002] Sign lamps are a type of special lighting equipment that convey safety, guidance or warning information through specific graphics, text or colors, for example, sign lamps used in explosion-proof fire emergency evacuation situations.

[0003] However, when the sign lamp is used in an explosive gas environment, there is a possibility that the sign lamp circuit in the sign lamp will ignite the explosive gas due to electric sparks or thermal effects. Utility Model Content

[0004] The embodiments of the present application provide a sign lamp circuit and a sign lamp, which can improve the technical problem in the related art that the sign lamp circuit may ignite explosive gas due to electric sparks or thermal effects.

[0005] In a first aspect, an embodiment of the present application provides a sign lamp circuit, comprising:

[0006] Input rectifier circuit, used to output a stable voltage after reducing and filtering the input DC power;

[0007] A charging management circuit is connected to the voltage output terminal of the input rectifier circuit and is used to output a voltage to charge the backup battery at a constant voltage;

[0008] a protection circuit, connected to the voltage output terminal of the charging management circuit, for connecting to the LED lamp and implementing overvoltage protection; and

[0009] A control circuit is connected to the input rectifier circuit, the charging management circuit and the protection circuit respectively, and the control circuit is used for voltage sampling and outputting a control signal to control the input rectifier circuit, the charging management circuit and the protection circuit.

[0010] The above technical solutions in the embodiments of the present application have at least the following technical effects:

[0011] The sign lighting circuit provided in the embodiments of the present application converts the input 24-36V DC power into a stable DC voltage through voltage reduction and filtering via an input rectifier circuit. The circuit voltage is limited to a safe range before powering the charging management circuit, protection circuit, and control circuit. The charging management circuit receives the voltage output by the input rectifier circuit and charges the backup battery (such as a lead-acid or lithium battery) with constant current / constant voltage while preventing overcharging. The protection circuit drives the LED lamp to illuminate and provides overcurrent protection, limiting the circuit current to a safe range to prevent short circuits or overloads. The circuit temperature is monitored, and when the monitored circuit temperature is too high, a protection mechanism is triggered to prevent overheating, thereby reducing the possibility of explosive gases ignited by electric sparks or thermal effects.

[0012] In a second aspect, an embodiment of the present application provides a sign lamp, which includes the above-mentioned sign lamp circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0014] Figure 1 A schematic diagram of the structure of a sign lamp circuit provided in an embodiment of the present application;

[0015] Figure 2 A schematic diagram of the structure of the input module provided in an embodiment of the present application;

[0016] Figure 3 A schematic diagram of the structure of the input acquisition module provided in an embodiment of the present application;

[0017] Figure 4 A schematic diagram of the structure of the output module provided in an embodiment of the present application;

[0018] Figure 5 A schematic diagram of the structure of the input protection module provided in an embodiment of the present application;

[0019] Figure 6 A schematic diagram of the structure of the charging management circuit provided in an embodiment of the present application;

[0020] Figure 7 A schematic diagram of the structure of the temperature protection module and the voltage protection module provided in the embodiment of the present application;

[0021] Figure 8 A schematic diagram of the structure of the LED control module and the safety discharge module provided in the embodiment of the present application;

[0022] Figure 9 A schematic diagram of the structure of the control circuit provided in an embodiment of the present application.

[0023] Among them, the reference numerals in the figures are:

[0024] 100. Sign lighting circuit; 10. Input rectifier circuit; 11. Input module; 12. Input acquisition module; 13. Output module; 14. Input protection module; 20. Charging management circuit; 21. Charging control module; 22. Battery connection module; 23. Switch control module; 24. Power conversion module; 30. Protection circuit; 31. Temperature protection module; 32. Voltage protection module; 33. LED control module; 34. Safety discharge module; 40. Control circuit. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the accompanying drawings are intended to cover non-exclusive inclusions.

[0027] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0030] In this application, "and / or" is simply a way to describe the relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0031] It should be noted that, in this application, words such as "in some embodiments", "exemplarily", "for example", etc. are used to indicate examples, illustrations or explanations. Any embodiment or design described in this application as "in some embodiments", "exemplarily", "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "in some embodiments", "exemplarily", "for example" is intended to present related concepts in a concrete way, meaning that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] Sign lamps are a type of special lighting equipment that convey safety, guidance or warning information through specific graphics, text or colors, for example, sign lamps used in explosion-proof fire emergency evacuation situations.

[0033] However, when the sign lamp is used in an explosive gas environment, there is a possibility that the sign lamp circuit in the sign lamp will ignite the explosive gas due to electric sparks or thermal effects.

[0034] Based on this, in order to improve the technical problem in the related art that the circuit of the sign lamp may ignite explosive gas due to electric sparks or thermal effects, the embodiments of the present application provide the following solutions.

[0035] See also Figure 1 An embodiment of the present application provides a sign lamp circuit 100 , which includes an input rectifier circuit 10 , a charging management circuit 20 , a protection circuit 30 , and a control circuit 40 .

[0036] The input rectifier circuit 10 is used to step down and filter the input DC power before outputting a stable voltage. The charging management circuit 20 is connected to the voltage output terminal of the input rectifier circuit 10 and outputs a voltage to charge the backup battery at a constant voltage. The protection circuit 30 is connected to the voltage output terminal of the charging management circuit 20 and is used to connect to the LED light and provide overvoltage protection. The control circuit 40 is connected to the input rectifier circuit 10, the charging management circuit 20, and the protection circuit 30, respectively. The control circuit 40 is used to sample the voltage and output control signals to control the input rectifier circuit 10, the charging management circuit 20, and the protection circuit 30.

[0037] As can be seen from the foregoing, the sign lamp circuit 100 provided in the embodiment of the present application converts the input 24-36V DC power into a stable DC voltage through voltage reduction and filtering via the input rectifier circuit 10. After limiting the circuit voltage to a safe range, it supplies power to the charging management circuit 20, the protection circuit 30, and the control circuit 40. The charging management circuit 20 receives the voltage output by the input rectifier circuit 10 and charges the backup battery (such as a lead-acid or lithium battery) with constant current / constant voltage while preventing overcharging. The protection circuit 30 drives the LED lamp to illuminate and provides overcurrent protection, limiting the circuit current to a safe range to prevent short circuits or overloads. It also monitors the circuit temperature and, if the detected circuit temperature is too high, triggers a protection mechanism to prevent overheating, thereby reducing the possibility of igniting explosive gases due to sparks or thermal effects.

[0038] In some embodiments, please refer to Figures 2 to 5 The input rectifier circuit 10 includes an input module 11 , an input acquisition module 12 , an output module 13 and an input protection module 14 .

[0039] The input module 11 is connected to an external power source and is used to configure the electronic components to receive direct current input from the external power source. The input acquisition module 12 is connected to the input module 11 and to the control circuit 40 and is used to configure the electronic components for signal transmission and switch control. The output module 13 is connected to the charging management circuit 20 and the input acquisition module 12 and is used to configure the electronic components for voltage regulation and power supply to the backend. The input protection module 14 is connected to the input acquisition module 12, the output module 13, and the control circuit 40 and is used to configure the electronic components to control the output module 13.

[0040] It can be understood that the input module 11 is a circuit structure that can establish a connection with an external power supply and receive input DC power by configuring specific electronic components to provide DC power for subsequent circuit modules. For example, the input module 11 can be a full-wave rectifier circuit or a bridge rectifier circuit, etc., but is not limited to this.

[0041] The input acquisition module 12 is a circuit structure that can collect the DC signal output by the input module 11, process it, and transmit it to the control circuit 40, and perform switch control operations according to the instructions of the control circuit 40. For example, the input module 11 may include electronic components such as resistors, diodes, and capacitors, but is not limited thereto.

[0042] The output module 13 is a circuit structure that stabilizes the DC power output by the input acquisition module 12 to provide a stable voltage output to power the back-end circuit. For example, the output module 13 can be a linear regulator, a switching regulator, etc., but is not limited to this.

[0043] The input protection module 14 is a circuit structure that is connected to the control circuit 40 and can control whether the chip U4 in the output module 13 is working according to the signal output by the control circuit 40. For example, the input protection module 14 can be an overvoltage protection circuit composed of a Zener diode. When the input voltage exceeds the set threshold, the overvoltage protection circuit limits the input voltage to a safe range or cuts off the power supply. The input protection module 14 can also be an overcurrent protection circuit composed of a current sensor. When it is detected that the input current exceeds the set maximum value, the overcurrent protection circuit cuts off the power supply to protect electronic components, etc., but is not limited to this.

[0044] With this setup, 24-36V DC power is connected via input module 11, which converts the DC power into a stable DC voltage through rectification and filtering before transmitting it to input acquisition module 12. Input acquisition module 12 provides a stable voltage signal through filtering and voltage divider circuits. It also receives the signal output by control circuit 40 to control the conduction or cutoff of circuit 40, thereby regulating the circuit's operating state. Output module 13 receives the voltage output from input acquisition module 12, filters it, smoothes the voltage waveform to reduce ripple, and samples the output voltage in real time through the voltage divider circuit in the circuit. Based on the sampled voltage, it regulates the switching frequency or duty cycle to ensure a stable output VDD voltage.

[0045] In some embodiments, see Figure 2 The input module 11 includes a power input connector J1, an inductor L4, an inductor L5, a fuse F1, a diode D2, a capacitor C1, a capacitor C2, and a rectifier bridge D3.

[0046] The power input connector J1 is used to connect to an external power supply to introduce power.

[0047] Inductor L4 is connected in series between pin 1 of the power input connector J1 and fuse F1, and inductor L5 is connected in series between pin 2 of the power input connector J1 and diode D2 to suppress high-frequency interference and common-mode noise.

[0048] The fuse F1 is connected in series between the inductor L4 and the rectifier bridge D3 and is used to melt when the current exceeds 0.5A to achieve overcurrent protection.

[0049] The diode D2 is connected between the fuse F1 and the output end of the inductor L5 and is used to conduct when an overvoltage occurs in the circuit to protect the downstream components.

[0050] The capacitor C1 and the capacitor C2 are respectively connected in parallel at both ends of the diode D2 for high-frequency filtering and are grounded through a connection line between the capacitor C1 and the capacitor C2.

[0051] The DC input end of the rectifier bridge D3 is connected to the output end of the inductor L5 and the output end of the fuse F1 respectively, and the DC output end of the rectifier bridge D3 is connected to the input acquisition module 12. The rectifier bridge D3 is used to simplify the wiring so that the input wiring (pin 1 and pin 2 of the rectifier bridge D3) does not need to distinguish between positive and negative poles, that is, the power input connector J1 can be connected to the positive pole at pin 1 and the negative pole at pin 2, or to the positive pole at pin 2 and the negative pole at pin 1.

[0052] Exemplarily, the power input connector J1 is a 2.0-2mm power input interface, which is used to provide a 24-36V power input channel for connecting to an external power supply.

[0053] Inductor L4 and inductor L5 are inductors with an inductance value of 150 μH, and are used to suppress high-frequency noise in the power input to smooth the current by using the principle of electromagnetic induction.

[0054] Fuse F1 is a 0.5A / 60V fuse, which is used to melt when the circuit current exceeds 0.5A, thereby cutting off the circuit and preventing overcurrent from damaging subsequent components.

[0055] Diode D2 is an SMF48CA transient suppression diode (TVS), which is used to quickly break down and conduct when the voltage suddenly changes (such as a surge), clamping the voltage to a safe value to protect the circuit from high voltage shocks.

[0056] Capacitors C1 and C2 are 30pF / 50V capacitors used to filter out high-frequency noise in the power supply through charge and discharge characteristics to stabilize the voltage.

[0057] Rectifier bridge D3 is an MB6S single-phase bridge rectifier, which is used to ensure the correct output polarity (pin 3 outputs positive and pin 4 outputs negative) through four internal diodes when the input power polarity is reversed.

[0058] With this setup, L4, L5, C1, and C2 form a filter network that removes high-frequency interference from the input power supply, improving power purity. F1 fuses out abnormal current flow, providing overcurrent protection. D2 suppresses transient overvoltages, providing overvoltage protection. D3 ensures correct output voltage polarity, ensuring normal output even if the input power supply is connected with reverse polarity.

[0059] In some embodiments, see Figure 3 The input acquisition module 12 includes a resistor R1, a resistor R2, a resistor R5, a resistor R6, a resistor R8, a resistor R9, a resistor R48, a transistor Q2, a diode D27, a capacitor C6, and a capacitor C21.

[0060] Resistors R1 and R2 are connected in series and bridged across the output end of the rectifier bridge D3 to form a voltage divider circuit, and are connected to the control circuit 40 via the SI signal point between the resistors R1 and R2 to provide voltage.

[0061] The resistor R5 is connected in series between the control circuit 40 and the base of the transistor Q2 to limit the base current. The control circuit 40 outputs the SO signal to the base of the transistor Q2 through the resistor R5. The SO signal is a high level or low level signal.

[0062] The resistor R6 is connected in series to the collector of the transistor Q2 and is used as a collector load resistor.

[0063] Resistors R8 and R9 are connected in series and connected across the output end of diode D27 to form a voltage divider circuit. The circuit is connected to the control circuit 40 via the M_CH signal point between resistors R8 and R9 to provide voltage.

[0064] The anode of the diode D27 is connected to the output end of the rectifier bridge D3, and the cathode of the diode D27 is connected to the output module 13, so as to prevent the power supply from being reversely connected to protect the circuit.

[0065] The resistor R48 is connected in series between the DC_EN signal interface and the cathode of the diode D27 . The DC_EN signal interface is connected to the output module 13 and the input protection module 14 .

[0066] The base of transistor Q2 is connected to the SO signal via resistor R5, the emitter of transistor Q2 is grounded, and the collector of transistor Q2 is connected to the anode of diode D27 via resistor R6. Transistor Q2 is used as a switching element to control the base current via the SO signal to achieve conduction or cutoff between the collector and emitter, thereby controlling the on / off of circuit 40.

[0067] Capacitor C6 and capacitor C21 are connected in parallel in the circuit, and both ends of capacitor C6 and capacitor C21 are connected to the cathode of diode D27 and ground respectively for filtering.

[0068] Exemplarily, the resistor R1 is a 150KΩ resistor, the resistor R2 is an 18KΩ resistor, the resistors R1 and R2 are used to form a voltage divider circuit, and the control circuit 40 obtains the SI signal through the voltage divider circuit formed by the resistors R1 and R2.

[0069] Resistor R5 is a 1kΩ resistor, resistor R6 is a 100Ω resistor, and transistor Q2 is a BC846B NPN transistor. Control circuit 40 outputs an SO signal to the base of transistor Q2 via resistor R5 to control whether transistor Q2 is turned on or off. Resistor R5 is connected in series with the base of Q2 to provide the necessary bias voltage for the transistor. Resistor R6 is used to limit the current at the collector of transistor Q2.

[0070] Diode D27 is a US1M diode used for rectification and freewheeling to protect the circuit from reverse voltage shock.

[0071] Resistor R8 is a 200kΩ (1% accuracy) resistor, and resistor R9 is a 10kΩ (1% accuracy) resistor. Resistors R8 and R9 form a voltage divider circuit. Control circuit 40 is connected to this voltage divider circuit. When control circuit 40 performs main circuit sampling to obtain the M-CH signal through this voltage divider circuit, resistors R8 and R9 provide a precise reference voltage to ensure signal processing accuracy.

[0072] Capacitor C6 is a 22μF / 50V electrolytic capacitor, which is used to filter out low-frequency ripple noise and smooth the voltage to provide a stable DC power supply for the circuit.

[0073] Capacitor C21 is a 104 (0.1μF) / 50V ceramic electrolytic capacitor, which is used to filter out high-frequency noise and ensure signal purity.

[0074] Resistor R48 is a 510KΩ resistor used to adjust the DC_EN signal level to control the enable state of chip U4.

[0075] With this configuration, control circuit 40 collects the SI and M-CH signals and outputs the SO signal, which in turn controls the conduction or cutoff of transistor Q2, thereby controlling circuit on / off or signal transmission. Capacitors C6 and C21 work together to filter low-frequency ripple, while capacitor C6 filters high-frequency noise, ensuring a stable and pure power supply and providing reliable power for subsequent circuits. Diode D27 prevents reverse voltage damage to the circuit (e.g., freewheeling protection). Resistors R8 and R9 provide precise voltage division, providing a reference for the M-CH signal. Resistor R48 adjusts the DC-EN level to enable chip U4, ensuring the circuit operates as desired. The coordinated operation of various electronic components implements functions such as signal processing, power filtering, circuit protection, and state control, ensuring stable and reliable operation of the entire circuit system and providing suitable operating conditions for subsequent circuits.

[0076] In some embodiments, see Figure 4The output module 13 includes a chip U4, an inductor L21, a diode D14, a resistor R55, a resistor R56, a resistor R30, a capacitor C8, a capacitor C11, a capacitor C4, a diode ZD3, and a transistor Q1.

[0077] The cathode of diode D27 is connected to the VIN pin of chip U4, the DC_EN signal interface is connected to the EN pin of chip U4, the SW pin of chip U4 is connected to the inductor L21, and the FB pin of chip U4 obtains output voltage feedback through the voltage divider circuit composed of resistors R55 and R56. The GND pin of chip U4 is grounded.

[0078] Inductor L21 is connected in series between the SW pin of chip U4 and the collector of transistor Q1 for current smoothing.

[0079] The cathode of the diode D14 is connected to the circuit node between the inductor L21 and the chip U4, and the anode is grounded, so as to provide a freewheeling path for the inductor L21 and prevent voltage spikes to protect the circuit.

[0080] The two ends of resistor R55 are connected to the FB pin of chip U4 and ground respectively. The two ends of resistor R56 are connected to the FB pin of chip U4 and the circuit node between inductor L21 and the collector of transistor Q1 respectively. Resistors R55 and R56 are used to form a voltage divider circuit to feed back the output voltage to the FB pin of chip U4.

[0081] Capacitor C8 , capacitor C11 , and capacitor C4 are all connected in parallel between the output terminal of the output module 13 and the ground. Capacitors C8 and C11 are used to filter out high-frequency noise, and capacitor C4 smoothes the output voltage.

[0082] The cathode of the diode ZD3 is connected to the base of the transistor Q1 , and the anode of the diode ZD3 is grounded. The diode ZD3 is used to stabilize the base voltage of the transistor Q1 .

[0083] The collector of the transistor Q1 is connected to the inductor L21, and the emitter of the transistor Q1 is connected to the charging management circuit 20 and the control circuit 40 for power supply. The base of the transistor Q1 is connected to the cathode of the diode ZD3. The transistor Q1 is used to control the base voltage through the voltage regulation value of the diode ZD3, and then adjust the degree of conduction between the collector and the emitter to achieve further regulation or protection of the voltage at the output end of the circuit.

[0084] The two ends of the resistor R30 are respectively connected to the circuit node between the inductor L21 and the collector of the transistor Q1 and the circuit node between the base of the transistor Q1 and the cathode of the diode ZD3, for limiting the base current of the transistor Q1 to protect the transistor Q1.

[0085] For example, the chip U4 is an OCX5864 chip, which controls the switching action of the SW pin through an internal circuit and cooperates with external components to achieve voltage conversion. The FB pin is used for feedback regulation of the output voltage, and the EN pin controls the chip enable.

[0086] Inductor L21 is a 47μH inductor used to store and release energy in the switching power supply, suppress current mutations, and play a filtering and energy storage role.

[0087] The diode D14 is an SS16 Schottky diode. When the SW of the chip U4 is turned off, it provides a current path for the inductor L21 to protect the chip U4.

[0088] Capacitor C8 is a 104 / 50V capacitor, and capacitor C11 is a 22 / 16V1266 capacitor, which is used to smooth the voltage by storing and releasing charge. Capacitor C8 filters out high-frequency noise, and capacitor C11 filters out low-frequency ripple, thereby jointly stabilizing the VCC voltage.

[0089] Resistor R55 is an 18.7K / 1% resistor, and resistor R56 is a 110K / 1% resistor. Resistor R55 and resistor R56 together form a voltage divider circuit to divide the VCC voltage and feed it back to the FB pin of chip U4 to achieve closed-loop regulation, thereby ensuring stable output voltage.

[0090] Transistor Q1 is an MMBT5551 NPN transistor, used in conjunction with ZD3 to stabilize the VDD output. Diode ZD3 is a 5.6V voltage regulator diode that utilizes its reverse breakdown characteristics. When the voltage across it reaches 5.6V, it breaks down and conducts, stabilizing the voltage and ensuring a stable VDD output at the emitter of transistor Q1. Resistor R30 is a 2KΩ resistor connected in parallel between the base and collector of transistor Q1 to prevent damage from excessive current and provide a stable bias voltage for transistor Q1.

[0091] Capacitor C4 is a 106 / 50V, 10μF capacitor used for further filtering, storing and releasing charges, smoothing the VDD voltage, and providing a stable power supply for the subsequent circuits.

[0092] This setup forms a buck circuit with chip U4, inductor L21, and diode D14. Chip U4 controls the SW pin, while inductor L21 stores energy and diode D14 provides freewheeling. Capacitors C8 and C11 filter and smooth the voltage. Resistors R55 and R56 divide the voltage and feed 0.8V back to chip U4's FB pin, adjusting the switching frequency or duty cycle within chip U4 to stabilize the VCC voltage. Transistor Q1, diode ZD3, and resistor R30 form a voltage regulator circuit. Diode ZD3 clamps the voltage, transistor Q1 regulates the current, and capacitor C4 further filters the voltage, converting VCC to a stable VDD output to ensure that VDD meets the requirements of downstream circuits.

[0093] In some embodiments, see Figure 5 The input protection module 14 includes a resistor R20 and a transistor Q4.

[0094] One end of resistor R20 is connected to control circuit 40 via the DC_CON signal interface, and the other end is connected to the base of transistor Q4. The emitter of transistor Q4 is grounded, and the collector of transistor Q4 is connected to the EN pin of chip U4 via the DC_EN signal interface. Transistor Q4 functions as a switching element to control the switching or control of the signal according to the DC_CON signal.

[0095] For example, transistor Q4 is MMBT5551, an NPN transistor. Resistor R20 is a 2KΩ resistor used to limit the base current, protect the transistor base from excessive current shock, and ensure that the DC_CON signal output by the control circuit 40 is converted into a base drive voltage.

[0096] With this setting, when the DC_CON signal input is low, the base voltage of transistor Q4 is insufficient, the collector and emitter of transistor Q4 are not conducting, the EN pin of chip U4 is pulled up externally to maintain a high level, and chip U4 works; when the DC_CON signal input is high, after current limiting by resistor R20, the base voltage of transistor Q4 increases, causing the collector and emitter of transistor Q4 to conduct, the EN pin of chip U4 is grounded, the EN pin level is pulled low, and chip U4 stops working.

[0097] In some embodiments, see Figure 6 The charging management circuit 20 includes a charging control module 21 , a battery connection module 22 , a switch control module 23 and a power conversion module 24 .

[0098] The charging control module 21 is connected to the voltage output terminal of the output module 13 and to the control circuit 40, and is used to configure the electronic components to control the on / off of the circuit 40 according to the BAT-CHAR signal output by the control circuit 40. The battery connection module 22 is connected to the charging control module 21 and the control circuit 40, and is used to configure the electronic components to control the on / off of the circuit 40 and charge the battery. The switch control module 23 is connected to the charging control module 21 and the battery connection module 22, and is used to configure the electronic components to control the on / off of the circuit 40. The power conversion module 24 is connected to the charging control module 21, the control circuit 40, and the protection circuit 30, and is used to configure the electronic components to output and regulate the voltage.

[0099] It can be understood that the charging control module 21 is a circuit structure that can receive the DC voltage from the output module 13 and dynamically control the on / off state of the circuit 40 based on the BAT-CHAR signal (PWM or digital signal) output by the control circuit 40. The battery connection module 22 is a circuit structure that can provide a battery interface and manage the charging process, including temperature monitoring and charging status indication, and control the on / off state of the circuit 40 based on the BAT-CON signal (PWM or digital signal) output by the control circuit 40. The switch control module 23 is a circuit structure that can control the on / off state of the circuit 40 based on the BAT-CON signal output by the control circuit 40. The power conversion module 24 is a circuit structure that can convert the input voltage into a suitable charging voltage.

[0100] With this setup, control circuit 40 detects the battery voltage and determines the battery status (e.g., low or normal). It then uses the BAT-CHAR signal to control charging control module 21 to turn the charging circuit on and off, thereby controlling whether the battery is charged or not when power conversion module 24 powers protection circuit 30 to illuminate the LED. Power conversion module 24 converts the voltage output by charging control module 21 to power protection circuit 30.

[0101] In some embodiments, see Figure 6 The charging control module 21 includes a transistor Q11 , a resistor R11 , a resistor R12 , a resistor R15 , and a resistor R25 .

[0102] The base of the transistor Q11 is connected to the control circuit 40 through the resistor R25, and is used to receive the BAT-CHAR signal output by the control circuit 40 to control the conduction or cutoff of the transistor Q11. The collector of the transistor Q11 is connected to the voltage output end of the output module 13, and the emitter of the transistor Q11 is connected to the first end of the resistor R15.

[0103] The first end of the resistor R12 is connected to the second end of the resistor R15, the second end of the resistor R12 is connected to one end of the resistor R11, and the other end of the resistor R11 is grounded. The control circuit 40 is used to obtain the BAT-CH voltage signal through the circuit node between the resistor R11 and the resistor R15.

[0104] Illustratively, transistor Q11 is an S8550 PNP transistor. Resistor R25 is a 2kΩ resistor used to limit the base current of transistor Q11, protecting its base while converting the BAT-CHAR signal into a suitable base drive voltage. Resistor R15 is a 15Ω resistor (1206 package) used for current limiting. Resistor R11 is a 47kΩ resistor, and resistor R12 is a 36kΩ resistor. Resistors R11 and R12 form a voltage divider circuit, providing a specific reference voltage for the BAT-CH signal node when the control circuit 40 samples the signal through the voltage divider circuit formed by resistors R11 and R12.

[0105] With this configuration, when the BAT-CHAR signal input is high, it is transmitted through resistor R25 to the base of transistor Q11, driving the collector and emitter of transistor Q11 into conduction. The output of output module 13 is then transmitted through the collector and emitter of transistor Q11 and resistor R15 to power the back-end circuitry. When the BAT-CHAR signal input is low, the collector and emitter of transistor Q11 are non-conductive. The voltage divider circuit formed by resistors R11 and R12 converts the BAT-CHAR signal to a specific level, which is used to monitor the battery's charge status (e.g., voltage level) and provide feedback to the control circuit 40.

[0106] In some embodiments, see Figure 6 The battery connection module 22 includes a charging battery interface J2, a fuse F3, a transistor Q6, a resistor R26, and a resistor R29.

[0107] Rechargeable battery interface J2 is connected to switch control module 23 and fuse F3. The base of transistor Q6 is connected to control circuit 40 via resistor R26 and receives the BAT-CON signal output by control circuit 40. The emitter of transistor Q6 is grounded, and the collector of transistor Q6 is connected to switch control module 23. The two ends of resistor R29 are respectively connected to the base of transistor Q6 and ground.

[0108] Exemplarily, the rechargeable battery interface J2 is a 2.54-2mm specification interface. Fuse F3 is a 50CF fuse, which is used to melt when the current in the circuit exceeds the rated value to cut off the circuit, prevent overcurrent from damaging other components, and achieve overcurrent protection. Transistor Q6 is MMBT5551, an NPN type transistor, which is used to control the on and off of the collector and emitter according to the BAT-CON signal output by the control circuit 40. Resistor R26 is a 2KΩ resistor, which is used to limit the base current of the transistor Q6, protect the base of the transistor Q6, and convert the BAT-CON signal output by the control circuit 40 into a suitable base drive voltage. Resistor R29 is a 10KΩ resistor, which is used as a base bias resistor. It cooperates with resistor R26 to ensure the stability of the base voltage of the transistor Q6 and assist in controlling the on or off state of the transistor Q6.

[0109] With this arrangement, when the BAT-CON signal output by the control circuit 40 is at a high level, transistor Q6 is turned on, and current can form a loop from the rechargeable battery interface J2 through the fuse F3 and transistor Q6, thereby starting charging; when the BAT-CON signal output by the control circuit 40 is at a low level, transistor Q6 is turned off, and charging stops.

[0110] Exemplarily, the battery connection module 22 may further include an LED lamp J7. When the BAT-CON signal is at a high level, the LED lamp J7 is lit, and when the BAT-CON signal is at a low level, the LED lamp J7 is off.

[0111] In some embodiments, see Figure 6 The switch control module 23 includes a resistor R3, a resistor R4, and a PMOS tube Q3.

[0112] Two ends of the resistor R4 are connected to the collector of the transistor Q6 and one end of the resistor R3 respectively.

[0113] The source of the PMOS transistor Q3 is connected to the other end of the resistor R3 and the charging battery interface J2. The gate of the PMOS transistor Q3 is connected to the circuit node between the resistor R3 and the resistor R4. The drain of the PMOS transistor Q3 is connected to the second end of the resistor R15, the first end of the resistor R12, and the power conversion module 24. The gate of the PMOS transistor Q3 is used to control the connection between the source and drain of the PMOS transistor Q3 according to the voltage of the circuit node between the resistor R3 and the resistor R4.

[0114] Illustratively, resistors R3 and R4 are both 10KΩ resistors, which are used to form a voltage divider circuit to provide a stable bias voltage for the gate of the PMOS tube Q3. The drain of the PMOS tube Q3 is used to receive the current output from the resistor R15, and the source of the PMOS tube Q3 is used to connect to pin 2 of the rechargeable battery interface J2.

[0115] With this configuration, when the BAT-CON signal is at a high level, the transistor Q6 is turned on, causing the gate of the PMOS transistor Q3 to be grounded, causing the voltage level at the gate to be pulled low, and the source and drain of the PMOS transistor Q3 to be turned on; when the BAT-CON signal is at a low level, the gate of the PMOS transistor Q3 remains at a high level, and the source and drain of the PMOS transistor Q3 are not turned on.

[0116] In some embodiments, see Figure 6 The power conversion module 24 includes a chip U2, an inductor L1, a diode D26, a resistor R10, a resistor R14, a resistor R24, a capacitor C12, a capacitor C10, a capacitor E2, and a capacitor C13.

[0117] The EN pin of chip U2 is connected to the control circuit 40 through resistor R10 and receives the DC_CON signal output by the control circuit 40. The IN pin of chip U2 is connected to the voltage output end of the output module 13 through resistor R15. The SW pin of chip U2 is connected to the inductor L1 and the diode D26. The GND pin of chip U2 is grounded. Chip U2 is used to adjust the output voltage.

[0118] One end of the inductor L1 is connected to the second end of the resistor R15, the first end of the resistor R12 and the drain of the PMOS tube Q3, and the other end of the inductor L1 is connected to the anode of the diode D26. The inductor L1 is connected in series with the SW pin of the chip U2 and the diode D26 to cooperate with the chip U2 to achieve energy conversion.

[0119] The cathode of diode D26 outputs VCC and is connected to the protection circuit 30. One end of capacitor C10, capacitor E2, and capacitor C13 are connected to the cathode output end of diode D26. The other ends of capacitors C10, E2, and capacitor C13 are grounded to filter out high-frequency and low-frequency ripples and stabilize the output voltage VCC.

[0120] One end of the capacitor C12 is connected to a circuit node between the second end of the resistor R15 and the first end of the resistor R12 , and the other end of the capacitor C12 is grounded.

[0121] One end of the resistor R14 is connected to the cathode output end of the diode D26, the other end of the resistor R14 is connected to one end of the resistor R24 and the FB pin of the chip U2, the other end of the resistor R24 is grounded, and the FB pin of the chip U2 receives the feedback voltage through the voltage divider circuit composed of the resistors R14 and R24.

[0122] For example, chip U2 is the SX1308, a DC-DC converter chip. It uses an internal switching circuit to control the on / off state of the SW pin, and works with external inductor L1 and diode D26 to achieve boost conversion. Power is input through the IN pin, the EN pin is an enable pin (active high), and the FB pin is a feedback pin that monitors the output voltage and adjusts the internal switching frequency to maintain output stability. Inductor L1 is a MWSA0603S-4R7MT, a 4.7μH inductor. It stores energy when the SW pin is on and releases it when the SW pin is off, working in conjunction with diode D26 to achieve boost. Diode D26 is an SS16 Schottky diode. Leveraging the Schottky diode's low forward voltage drop and short reverse recovery time, it provides a freewheeling path for inductor L1 when the SW pin is off, ensuring energy transfer to the output. R10 is a 100kΩ resistor that converts the DC-CON signal level to the drive voltage of the EN pin, controlling the chip enable. Resistor R14 is a 110kΩ / 1% resistor, and resistor R24 is a 12kΩ / 1% resistor. They form a feedback voltage divider circuit, dividing the output voltage VCC and inputting it to the FB pin. Capacitor C12 is a 106 / 25V, 10μF capacitor, capacitor C10 is a 106 / 50V, 10μF capacitor, and capacitor E2 is a 47μF / 16V electrolytic capacitor. They filter out ripple in the input and output voltages and smooth the voltage waveforms. Capacitor C13 is a 104, 0.1μF capacitor connected in parallel across resistor R24 to improve feedback loop stability and suppress high-frequency noise.

[0123] With this setup, chip U2 controls the SW pin, which, in conjunction with inductor L1 and diode D26, boosts the input voltage to output a stable VCC voltage, powering subsequent circuits. The DC-CON signal output by control circuit 40, via resistor R10, controls the EN pin to determine circuit operation (high level for operation, low level for shutdown). A feedback network composed of resistors R14 and R24 monitors the VCC voltage in real time, receiving feedback signals through the FB pin to enable the chip to adjust the switching frequency, ensuring the output voltage remains stable at the set value. Capacitors C12, C10, and E2 filter out ripple, providing a clean VCC power supply and ensuring stable operation of subsequent circuits.

[0124] In some embodiments, please refer to Figures 7 and 8 The protection circuit 30 includes a temperature protection module 31 , a voltage protection module 32 , an LED control module 33 and a safety discharge module 34 .

[0125] The input of the temperature protection module 31 is connected to the voltage output of the power conversion module 24. The temperature protection module 31 is used to configure electronic components to implement temperature protection functions to prevent overheating. The input of the voltage protection module 32 is connected to the output of the temperature protection module 31. The voltage protection module 32 is used to configure electronic components to connect to the LED lamp and implement overcurrent protection, overvoltage protection, and current limiting functions. The input of the LED control module 33 is connected to the output of the voltage protection module 32. The LED control module 33 is connected to the control circuit 40. The LED control module 33 is used to configure electronic components to receive signals sent by the control circuit 40 and control the on and off of the circuit 40. The safety discharge module 34 is connected to the working ground and the protection ground and is used to configure electronic components to achieve safe charge discharge.

[0126] It can be understood that the temperature protection module 31 is a circuit structure that can monitor temperature in real time and trigger a protection mechanism when the temperature exceeds a safety threshold to prevent circuit damage due to overheating. The voltage protection module 32 is a circuit structure that integrates overvoltage protection, overcurrent protection, and current limiting functions to ensure that the output voltage and current are within a safe range. The LED control module 33 is a circuit structure that can receive the digital signal output by the control circuit 40 to control the lighting or extinguishing of the LED light. The safety discharge module 34 is a circuit structure that can quickly discharge the charge in energy storage elements (such as capacitors and inductors) to prevent residual voltage from causing harm to personnel or equipment.

[0127] With this arrangement, the temperature protection module 31 prevents the circuit from continuously overheating, the voltage protection module 32 provides overvoltage protection, overcurrent protection and current limiting functions, and the safety discharge module 34 quickly discharges the charge in the energy storage element to provide all-round safety protection.

[0128] In some embodiments, see Figure 7 The temperature protection module 31 includes a temperature protection element RS1 and a resistor R32.

[0129] The two ends of temperature protection element RS1 are connected to the voltage output terminal of power conversion module 24 and the input terminal of voltage protection module 32, respectively. Temperature protection element RS1 is used to detect circuit temperature and control the on / off operation of circuit 40 based on the circuit temperature. Resistor R32 is connected in parallel with temperature protection element RS1. The voltage output by power conversion module 24 is supplied to voltage protection module 32 through the parallel path formed by resistor R32 and temperature protection element RS1.

[0130] For example, resistor R32 is a 1206 package resistor. The resistance value of resistor R32 can be selected based on actual conditions to limit the current in the circuit. Temperature protection element RS1 is a 72°C thermal fuse that melts when the ambient temperature reaches 72°C, thereby shutting off the circuit path and providing over-temperature protection.

[0131] With this configuration, during normal operation, current flows from VCC (DC6.5V) through resistor R32 to LED+. Resistor R32 limits the current through its own resistance value, preventing excessive current from damaging subsequent circuits (such as the LED load). When the temperature is too high, the temperature protection element RS1 melts, cutting off the circuit path from VCC to LED+, preventing component damage or failure due to excessive temperature, thereby ensuring circuit safety.

[0132] In some embodiments, see Figure 7 The voltage protection module 32 includes a fuse RS3, a fuse RS2, a diode D9, a diode D10, a diode D11, a diode D12, a diode D5, a diode D6, a diode D7, a diode D8, a resistor RA1, a resistor RA2, a resistor RA3, a resistor RA4, a resistor RA5, a resistor RA6, a resistor RA7, a resistor RA8, a resistor RA9, a resistor RA10, a resistor RA11, a resistor RA12, and an LED lamp J3.

[0133] After the diode D9 and the diode D11 are connected in series, they are connected in parallel with the series branch of the diode D10 and the diode D12 to form a first parallel suppression circuit.

[0134] The resistors RA1 , RA3 , and RA5 are connected in parallel and then connected in series with a parallel branch of the resistors RA2 , RA4 , and RA6 to form a first resistor array.

[0135] One end of the first parallel suppression circuit is connected to one end of the fuse RS3 and one end of the first resistor array, the other end of the first parallel suppression circuit is grounded, the other end of the first resistor array is connected to the LED lamp J3, and the other end of the fuse RS3 is connected to the parallel path formed by the fuse R32 and the temperature protection element RS1.

[0136] One end of the fuse RS2 is connected to the LED lamp J3.

[0137] After the diode D5 and the diode D6 are connected in series, they are connected in parallel with the series branch of the diode D7 and the diode D8 to form a second parallel suppression circuit.

[0138] The resistors RA7, RA9, and RA11 are connected in parallel and then connected in series with the parallel branch of the resistors RA8, RA10, and RA12 to form a second resistor array.

[0139] One end of the second parallel suppression circuit is connected to the other end of the fuse RS2 and one end of the second resistor array. The other end of the second parallel suppression circuit is grounded. The other end of the second resistor array is connected to the LED control module 33 .

[0140] The first parallel suppression circuit and the second parallel suppression circuit are used to conduct when transient high voltage appears in the circuit to limit the voltage to a safe range. The first resistor array and the second resistor array are used to limit the current and share the voltage. The fuse RS3 and the fuse RS2 are used for overcurrent protection.

[0141] For example, fuses RS3 and RS2 are both 50CF fuse resistors, designed to melt and disconnect the circuit when the circuit current exceeds the rated value, providing overcurrent protection and preventing abnormal current from damaging subsequent components. Diodes D9, D10, D11, D12, D5, D6, D7, and D8 are all SMBJ5.0CA bidirectional transient suppression diodes (TVS). They are designed to quickly break down and conduct when transient overvoltages (such as surges) occur in the circuit, clamping the voltage to a safe value (approximately 5.0V) and absorbing overvoltage energy, protecting the circuit from high-voltage surges. Resistors RA1, RA2, RA3, RA4, RA5, RA6, RA7, RA8, RA9, RA10, RA11, and RA12 are all 10Ω resistors (2512 package). Multiple resistors are connected in parallel to increase current-carrying capacity, thereby shunting or limiting the current in the circuit and preventing overload on individual resistors. LED light J3 is an interface component used to connect external loads (such as LED light strips) to achieve power and signal transmission.

[0142] This configuration uses fuses RS3 and RS2 as fuse resistors, shutting off the circuit when the current increases abnormally, thereby protecting subsequent components. TVS diodes, such as diodes D9 to D12 and diodes D5 to D8, suppress transient overvoltages, ensuring that the circuit voltage remains within a safe range and preventing components from being damaged by high voltage. Connecting multiple resistors in parallel, such as resistors RA1 to RA6 and RA7 to RA12, increases current-carrying capacity and distributes current appropriately, preventing damage to individual resistors due to excessive current. Connecting an external load through the LED light J3 interface ensures the circuit provides stable power input to the load while ensuring its safety.

[0143] In some embodiments, see Figure 8 The LED control module 33 includes a resistor R16, a resistor R17, a resistor R18, a transistor Q7, and a capacitor C14.

[0144] The collector of transistor Q7 is connected to the other end of the second resistor array, the base of transistor Q7 is connected to one end of resistor R18, the other end of resistor R18 is connected to control circuit 40, and control circuit 40 is used to output the LED-M signal to the base of transistor Q7 through resistor R18. The emitter of transistor Q7 is connected to resistor R17 and resistor R16. Transistor Q7 is used as a switching element to control the base current through the LED-M signal to achieve conduction or cutoff between the collector and emitter.

[0145] One end of the resistor R17 is connected to the control circuit 40 for outputting the LED-M-CH signal to the control circuit 40 and limiting the current of the LED-M-CH signal. The other end of the resistor R17 is connected to the circuit node between the emitter of the transistor Q7 and the resistor R16.

[0146] One end of the resistor R16 is connected to the circuit node between the emitter of the transistor Q7 and the resistor R17, and the other end of the resistor R16 is grounded. The resistor R16 is used for current detection and reflects the circuit current through the voltage drop.

[0147] Capacitor C14 is connected in parallel between the LED-M-CH signal and ground to filter out high-frequency noise in the LED-M-CH signal.

[0148] For example, transistor Q7 is an SS8050 NPN transistor, designed to conduct when the LED-M signal is high. Resistor R18 is a 10kΩ resistor with a 5% precision, used to limit the base current of transistor Q7, protecting the base of transistor Q7 and converting the LED-M signal into an appropriate base drive voltage. Resistor R17 is a 2kΩ resistor with a 5% precision, used for voltage division. Resistor R16 is a 5.1Ω resistor (1206 package) used as a current sampling resistor, monitoring or providing feedback of current information through the voltage drop across it. Capacitor C14 is a 104 / 50V, 0.1μF capacitor used to filter high-frequency noise.

[0149] With this setup, the LED-M signal output by control circuit 40 controls the conduction or cutoff of transistor Q7 via resistor R18, thereby controlling the on / off state of the LED- path. When the LED-M signal is high, transistor Q7 conducts, allowing current to flow through transistor Q7 to LED-. When the LED-M signal is low, transistor Q7 turns off, interrupting the LED- path. Control circuit 40 collects the voltage (LED-M-CH) across resistor R16 via resistor R17 and capacitor C14, providing feedback to control circuit 40 for monitoring or controlling current in circuit 40.

[0150] In some embodiments, see Figure 8 The safety discharge module 34 includes a resistor RA13 and a capacitor C3.

[0151] Resistor RA13 is connected in parallel across capacitor C3, with one end connected to the operating ground and the other to the protective ground. Resistor RA13 is used to suppress high-voltage noise. Capacitor C3 is connected in parallel between the operating ground and the protective ground for safe charge discharge.

[0152] For example, resistor RA13 is a 1MΩ resistor (2512 package) for discharging charge, and capacitor C3 is a 223 / 2KV, 22nF capacitor for suppressing high-frequency interference.

[0153] With this setup, resistor RA13 acts as a high-value resistor, slowly discharging the charge stored in capacitor C3 when the circuit is powered off or in standby mode. This prevents charge accumulation from causing electric shock or component damage, ensuring operational safety and circuit stability. By connecting the circuit to GND (signal ground) and PE (protective earth), resistor RA13 and capacitor C3 effectively discharge static electricity or abnormal voltage, preventing high-voltage shock and protecting the circuit and personnel.

[0154] In some embodiments, see Figure 9 The control circuit 40 includes a chip U1, a connector J5, an inductor L3, a capacitor C5, a resistor R7, and a light-emitting diode LED0.

[0155] Two ends of the inductor L3 are connected to the output end of the input rectifier circuit 10 and one end of the capacitor C5 respectively. The inductor L3 is used to suppress high-frequency interference and smooth the power supply current.

[0156] The other end of the capacitor C5 is grounded. The capacitor C5 is used to filter out high-frequency noise and stabilize the voltage.

[0157] The VDD pin of chip U1 is connected to the circuit node between L3 and C5, and the input rectifier circuit 10 supplies power to chip U1 through inductor L3 and VDD pin; the GND pin of chip U1 is grounded; the PB0 pin of chip U1 is connected to the input rectifier circuit 10 for outputting the DC_CON signal; the PB1 pin of chip U1 is connected to the charging management circuit 20 for outputting the BAT-CHAR signal; the PB2 pin of chip U1 is connected to the charging management circuit 20 for collecting the BAT-CH voltage signal; the PB3 pin of chip U1 is connected to the charging management circuit 20 for collecting the BAT-CH voltage signal. The circuit 20 is connected to output the BAT-CON signal; the PA0 pin of the chip U1 is connected to the input acquisition module 12 to output the SO signal; the PA1 pin of the chip U1 is connected to the input acquisition module 12 to collect the SI voltage signal; the PA2 pin of the chip U1 is connected to the input acquisition module 12 to collect the M-CH voltage signal; the PA3 pin of the chip U1 is connected to the protection circuit 30 to collect the LED-M-CH voltage signal; the PA7 pin of the chip U1 is connected to the protection circuit 30 to output the LED-M signal.

[0158] One end of the light-emitting diode LED0 is connected to the PB4 pin of the chip U1 for receiving the Status signal output by the PB4 pin. The other end of the light-emitting diode LED0 is connected to one end of the resistor R7. The other end of the resistor R7 is grounded. The resistor R7 is used to limit the current.

[0159] For example, chip U1 is a TD313A01TI microcontroller (MCU), which processes input pin signals through an internal program and outputs control signals based on logic, enabling driving and data communication for input acquisition module 12, output module 13, input protection module 14, charging control module 21, battery connection module 22, power conversion module 24, and LED control module 33. Inductor L3 is a 100μH inductor that suppresses sudden changes in power supply current, filters out low-frequency interference, and ensures VDD power supply stability. Capacitor C5 is a 104 / 50V, 0.1μF capacitor that filters high-frequency noise in the VDD power supply and smoothes the voltage waveform. Resistor R7 is a 10KΩ resistor that limits the current in LED 0 to prevent damage from excessive current. LED 0 is a light-emitting diode. When the Status signal output by chip U1 is high, current flows through resistor R7 to LED 0, causing it to illuminate, indicating system status.

[0160] In this configuration, the filter circuit formed by inductor L3 and capacitor C5 suppresses power supply interference and provides a stable VDD power supply for chip U1. Chip U1 receives input signals, processes them, and then outputs control signals to control the on and off of each module.

[0161] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A sign lamp circuit, characterized in that, include: Input rectifier circuit, used to output a stable voltage after reducing and filtering the input DC power; A charging management circuit is connected to the voltage output terminal of the input rectifier circuit and is used to output a voltage to charge the backup battery at a constant voltage; A protection circuit, connected to the voltage output terminal of the charging management circuit, for connecting to the LED lamp and implementing overvoltage protection; as well as A control circuit is connected to the input rectifier circuit, the charging management circuit and the protection circuit respectively, and the control circuit is used for voltage sampling and outputting a control signal to control the input rectifier circuit, the charging management circuit and the protection circuit.

2. The marker lamp circuit according to claim 1, wherein: The input rectifier circuit comprises: An input module, connected to an external power supply, for configuring electronic components to receive direct current input from the external power supply; An input acquisition module, connected to the input module and the control circuit, for configuring electronic components for signal transmission and switch control; an output module, connected to the charging management circuit and the input acquisition module, for configuring electronic components to stabilize voltage and provide power to the backend; and An input protection module is connected to the output module and the control circuit, and is used to configure electronic components to control the on and off of the output module.

3. The marker lamp circuit according to claim 2, wherein: The input module includes a power input connector J1, an inductor L4, an inductor L5, a fuse F1, a diode D2, a capacitor C1, a capacitor C2, and a rectifier bridge D3, wherein: The power input connector J1 is used to connect to an external power source to introduce power; The inductor L4 is connected in series between pin 1 of the power input connector J1 and the fuse F1, and the inductor L5 is connected in series between pin 2 of the power input connector J1 and the diode D2 to suppress high-frequency interference and common-mode noise; The fuse F1 is connected in series between the inductor L4 and the rectifier bridge D3, and is used to melt when the current exceeds 0.5A to achieve overcurrent protection; The diode D2 is connected between the fuse F1 and the output end of the inductor L5, and is used to conduct when an overvoltage occurs in the circuit to protect the back-end components; The capacitor C1 and the capacitor C2 are respectively connected in parallel at both ends of the diode D2 for high-frequency filtering and are grounded through the connection line between the capacitor C1 and the capacitor C2; The DC input end of the rectifier bridge D3 is connected to the output end of the inductor L5 and the output end of the fuse F1 respectively, and the DC output end of the rectifier bridge D3 is connected to the input acquisition module. The rectifier bridge D3 is used to simplify the wiring so that the input wiring does not need to distinguish between positive and negative poles; And / or, the input acquisition module includes a resistor R1, a resistor R2, a resistor R5, a resistor R6, a resistor R8, a resistor R9, a resistor R48, a transistor Q2, a diode D27, a capacitor C6, and a capacitor C21, wherein: The resistor R1 and the resistor R2 are connected in series and connected across the output end of the rectifier bridge D3 to form a voltage divider circuit, and are connected to the control circuit through the SI signal point located between the resistor R1 and the resistor R2 to provide voltage; The resistor R5 is connected in series between the control circuit and the base of the transistor Q2 to limit the base current. The control circuit outputs an SO signal to the base of the transistor Q2 through the resistor R5. The SO signal is a high level or low level signal. The resistor R6 is connected in series to the collector of the transistor Q2 and is used as a collector load resistor; The resistor R8 and the resistor R9 are connected in series and connected across the output end of the diode D27 to form a voltage divider circuit, and are connected to the control circuit through the M_CH signal point located between the resistor R8 and the resistor R9 to provide voltage; The anode of the diode D27 is connected to the output end of the rectifier bridge D3, and the cathode of the diode D27 is connected to the output module, so as to prevent the power supply from being reversely connected to protect the circuit; The resistor R48 is connected in series between the DC_EN signal interface and the cathode of the diode D27, and the DC_EN signal interface is connected to the output module and the input protection module; The base of the transistor Q2 is connected to the SO signal via the resistor R5, the emitter of the transistor Q2 is grounded, and the collector of the transistor Q2 is connected to the anode of the diode D27 via the resistor R6, and is used as a switching element to control the base current according to the SO signal to achieve conduction or cutoff between the collector and the emitter, thereby controlling the on / off of the circuit; The capacitor C6 and the capacitor C21 are connected in parallel in the circuit, and the two ends of the capacitor C6 and the capacitor C21 are connected to the cathode of the diode D27 and the ground respectively for filtering; And / or, the output module includes a chip U4, an inductor L21, a diode D14, a resistor R55, a resistor R56, a resistor R30, a capacitor C8, a capacitor C11, a capacitor C4, a diode ZD3, and a transistor Q1, wherein: The cathode of the diode D27 is connected to the VIN pin of the chip U4, the DC_EN signal interface is connected to the EN pin of the chip U4, the SW pin of the chip U4 is connected to the inductor L21, the FB pin of the chip U4 obtains output voltage feedback through the voltage divider circuit composed of the resistors R55 and R56, and the GND pin of the chip U4 is grounded; The inductor L21 is connected in series between the SW pin of the chip U4 and the collector of the transistor Q1 to smooth the current; The cathode of the diode D14 is connected to the circuit node between the inductor L21 and the chip U4, and the anode is grounded, so as to provide a freewheeling path for the inductor L21 to prevent voltage spikes and protect the circuit. The two ends of the resistor R55 are respectively connected to the FB pin of the chip U4 and the ground, and the two ends of the resistor R56 are respectively connected to the FB pin of the chip U4 and the circuit node between the inductor L21 and the collector of the transistor Q1. The resistor R55 and the resistor R56 are used to form a voltage divider circuit to feed back the output voltage to the FB pin of the chip U4; The capacitor C8, the capacitor C11 and the capacitor C4 are all connected in parallel between the output terminal of the output module and the ground. The capacitors C8 and C11 are used to filter out high-frequency noise, and the capacitor C4 smoothes the output voltage. The cathode of the diode ZD3 is connected to the base of the transistor Q1, and the anode of the diode ZD3 is grounded. The diode ZD3 is used to stabilize the base voltage of the transistor Q1. The collector of the transistor Q1 is connected to the inductor L21, the emitter of the transistor Q1 is connected to the charging management circuit and the control circuit for power supply, and the base of the transistor Q1 is connected to the cathode of the diode ZD3. The transistor Q1 is used to control the base voltage through the voltage regulation value of the diode ZD3, thereby adjusting the degree of conduction between the collector and the emitter to achieve further regulation or protection of the voltage at the output end of the circuit; The two ends of the resistor R30 are respectively connected to the circuit node between the inductor L21 and the collector of the transistor Q1 and the circuit node between the base of the transistor Q1 and the cathode of the diode ZD3, for limiting the base current of the transistor Q1 to protect the transistor Q1; And / or, the input protection module includes a resistor R20 and a transistor Q4, wherein: One end of the resistor R20 is connected to the control circuit via the DC_CON signal interface, and the other end is connected to the base of the transistor Q4; The emitter of the transistor Q4 is grounded, and the collector of the transistor Q4 is connected to the EN pin of the chip U4 through the DC_EN signal interface. The transistor Q4 is used as a switching element to control the switching or control of the signal according to the DC_CON signal.

4. The marker lamp circuit according to claim 2, wherein: The charging management circuit includes: a charging control module, connected to the voltage output terminal of the output module and to the control circuit, and configured to configure electronic components to control the on / off of the circuit according to the BAT-CHAR signal output by the control circuit; A battery connection module, connected to the charging control module and the control circuit, for configuring electronic components to control the on / off of the circuit and charge the battery; a switch control module connected to the charging control module and the battery connection module, and configured to configure electronic components to control the on / off of the circuit; and A power conversion module is connected to the charging control module, the control circuit and the protection circuit, and is used to configure electronic components to output and regulate voltage.

5. The marker lamp circuit according to claim 4, wherein: The charging control module includes a transistor Q11, a resistor R11, a resistor R12, a resistor R15, and a resistor R25, wherein: The base of the transistor Q11 is connected to the control circuit through the resistor R25, and is used to receive the BAT-CHAR signal output by the control circuit to control the conduction or cutoff of the transistor Q11. The collector of the transistor Q11 is connected to the voltage output end of the output module, and the emitter of the transistor Q11 is connected to the first end of the resistor R15; The first end of the resistor R12 is connected to the second end of the resistor R15, the second end of the resistor R12 is connected to one end of the resistor R11, and the other end of the resistor R11 is grounded, and the control circuit is used to obtain the BAT-CH voltage signal through the circuit node between the resistor R11 and the resistor R15; And / or, the battery connection module includes a rechargeable battery interface J2, a fuse F3, a transistor Q6, a resistor R26, and a resistor R29, wherein: The rechargeable battery interface J2 is connected to the switch control module and the fuse F3; The base of the transistor Q6 is connected to the control circuit through the resistor R26 and receives the BAT-CON signal output by the control circuit, the emitter of the transistor Q6 is grounded, and the collector of the transistor Q6 is connected to the switch control module; The two ends of the resistor R29 are connected to the base of the transistor Q6 and the ground respectively; And / or, the switch control module includes a resistor R3, a resistor R4, and a PMOS transistor Q3, wherein: The two ends of the resistor R4 are connected to the collector of the transistor Q6 and one end of the resistor R3 respectively; The source of the PMOS tube Q3 is connected to the other end of the resistor R3 and the rechargeable battery interface J2, the gate of the PMOS tube Q3 is connected to the circuit node between the resistor R3 and the resistor R4, the drain of the PMOS tube Q3 is connected to the second end of the resistor R15, the first end of the resistor R12, and the power conversion module, and the gate of the PMOS tube Q3 is used to control the connection and disconnection between the source of the PMOS tube Q3 and the drain of the PMOS tube Q3 according to the voltage of the circuit node between the resistor R3 and the resistor R4.

6. The marker lamp circuit according to claim 5, wherein: The power conversion module includes a chip U2, an inductor L1, a diode D26, a resistor R10, a resistor R14, a resistor R24, a capacitor C12, a capacitor C10, a capacitor E2, and a capacitor C13, wherein: The EN pin of the chip U2 is connected to the control circuit through the resistor R10 and receives the DC_CON signal output by the control circuit. The IN pin of the chip U2 is connected to the voltage output end of the output module through the resistor R15. The SW pin of the chip U2 is connected to the inductor L1 and the diode D26. The GND pin of the chip U2 is grounded. The chip U2 is used to adjust the output voltage. One end of the inductor L1 is connected to the second end of the resistor R15, the first end of the resistor R12, and the drain of the PMOS transistor Q3. The other end of the inductor L1 is connected to the anode of the diode D26. The inductor L1 is connected in series with the SW pin of the chip U2 and the diode D26 to cooperate with the chip U2 to achieve energy conversion. The cathode of the diode D26 outputs VCC and is connected to the protection circuit. One end of the capacitor C10, the capacitor E2, and the capacitor C13 are connected to the cathode output end of the diode D26. The other ends of the capacitors C10, E2, and C13 are grounded, for filtering high-frequency and low-frequency ripples and stabilizing the output voltage VCC. One end of the capacitor C12 is connected to a circuit node between the second end of the resistor R15 and the first end of the resistor R12, and the other end of the capacitor C12 is grounded; One end of the resistor R14 is connected to the cathode output end of the diode D26, the other end of the resistor R14 is connected to one end of the resistor R24 and the FB pin of the chip U2, the other end of the resistor R24 is grounded, and the FB pin of the chip U2 receives the feedback voltage through the voltage divider circuit composed of the resistor R14 and the resistor R24.

7. The marker lamp circuit according to claim 4, wherein: The protection circuit comprises: a temperature protection module, wherein the input end of the temperature protection module is connected to the voltage output end of the power conversion module, and the temperature protection module is used to configure electronic components to implement a temperature protection function to prevent overheating; A voltage protection module, the input end of which is connected to the output end of the temperature protection module, and the voltage protection module is used to configure electronic components to connect to the LED lamp and implement overcurrent protection, overvoltage protection, and current limiting functions; An LED control module, wherein the input end of the LED control module is connected to the output end of the voltage protection module, the LED control module is connected to the control circuit, and the LED control module is used to configure electronic components to receive signals sent by the control circuit and control the circuit on and off; and The safety discharge module is connected to the working ground and the protection ground and is used to configure electronic components to achieve safe discharge of charge.

8. The marker lamp circuit according to claim 7, wherein: The temperature protection module includes a temperature protection element RS1 and a resistor R32, wherein: The two ends of the temperature protection element RS1 are respectively connected to the voltage output end of the power conversion module and the input end of the voltage protection module. The temperature protection element RS1 is used to detect the circuit temperature and control the circuit on and off according to the circuit temperature; The resistor R32 is connected in parallel with the temperature protection element RS1; The voltage output by the power conversion module supplies power to the voltage protection module through a parallel path formed by the resistor R32 and the temperature protection element RS1; And / or, the voltage protection module includes a fuse RS3, a fuse RS2, a diode D9, a diode D10, a diode D11, a diode D12, a diode D5, a diode D6, a diode D7, a diode D8, a resistor RA1, a resistor RA2, a resistor RA3, a resistor RA4, a resistor RA5, a resistor RA6, a resistor RA7, a resistor RA8, a resistor RA9, a resistor RA10, a resistor RA11, a resistor RA12, and an LED lamp J3, wherein: The diode D9 is connected in series with the diode D11, and then connected in parallel with the series branch of the diode D10 and the diode D12 to form a first parallel suppression circuit; The resistors RA1, RA3, and RA5 are connected in parallel and then connected in series with the parallel branch of the resistors RA2, RA4, and RA6 to form a first resistor array; One end of the first parallel suppression circuit is connected to one end of the fuse RS3 and one end of the first resistor array, the other end of the first parallel suppression circuit is grounded, the other end of the first resistor array is connected to the LED lamp J3, and the other end of the fuse RS3 is connected to the parallel path formed by the fuse R32 and the temperature protection element RS1; One end of the fuse RS2 is connected to the LED lamp J3; The diode D5 is connected in series with the diode D6, and then connected in parallel with the series branch of the diode D7 and the diode D8 to form a second parallel suppression circuit; The resistors RA7, RA9, and RA11 are connected in parallel and then connected in series with the parallel branch of the resistors RA8, RA10, and RA12 to form a second resistor array; One end of the second parallel suppression circuit is connected to the other end of the fuse RS2 and one end of the second resistor array, the other end of the second parallel suppression circuit is grounded, and the other end of the second resistor array is connected to the LED control module; The first parallel suppression circuit and the second parallel suppression circuit are used to conduct when a transient high voltage occurs in the circuit to limit the voltage to a safe range. The first resistor array and the second resistor array are used to limit the current and share the voltage. The fuse RS3 and the fuse RS2 are used for overcurrent protection. And / or, the LED control module includes a resistor R16, a resistor R17, a resistor R18, a transistor Q7, and a capacitor C14, wherein: The collector of the transistor Q7 is connected to the other end of the second resistor array, the base of the transistor Q7 is connected to one end of the resistor R18, the other end of the resistor R18 is connected to the control circuit, the control circuit is used to output the LED-M signal to the base of the transistor Q7 through the resistor R18, the emitter of the transistor Q7 is connected to the resistor R17 and the resistor R16, and the transistor Q7 is used as a switching element to control the base current according to the LED-M signal to achieve conduction or cutoff between the collector and the emitter; One end of the resistor R17 is connected to the control circuit, and is used to output the LED-M-CH signal to the control circuit and limit the current of the LED-M-CH signal. The other end of the resistor R17 is connected to the circuit node between the emitter of the transistor Q7 and the resistor R16. One end of the resistor R16 is connected to the circuit node between the emitter of the transistor Q7 and the resistor R17, and the other end of the resistor R16 is grounded. The resistor R16 is used for current detection and reflects the circuit current through the voltage drop; The capacitor C14 is connected in parallel between the LED-M-CH signal and the ground, and is used to filter out high-frequency noise in the LED-M-CH signal.

9. The marker lamp circuit according to claim 2, wherein: The control circuit includes a chip U1, a connector J5, an inductor L3, a capacitor C5, a resistor R7, and a light-emitting diode LED0, wherein: The two ends of the inductor L3 are respectively connected to the output end of the input rectifier circuit and one end of the capacitor C5. The inductor L3 is used to suppress high-frequency interference and smooth the power supply current. The other end of the capacitor C5 is grounded, and the capacitor C5 is used to filter out high-frequency noise and stabilize the voltage; The VDD pin of the chip U1 is connected to the circuit node between the L3 and the C5, and the input rectifier circuit supplies power to the chip U1 through the inductor L3 and the VDD pin; the GND pin of the chip U1 is grounded; the PB0 pin of the chip U1 is connected to the input rectifier circuit for outputting a DC_CON signal; the PB1 pin of the chip U1 is connected to the charging management circuit for outputting a BAT-CHAR signal; the PB2 pin of the chip U1 is connected to the charging management circuit for collecting a BAT-CH voltage signal; the PB3 pin of the chip U1 is connected to the charging management circuit for collecting a BAT-CH voltage signal. The pin is connected to the charging management circuit for outputting the BAT-CON signal; the PA0 pin of the chip U1 is connected to the input acquisition module for outputting the SO signal; the PA1 pin of the chip U1 is connected to the input acquisition module for collecting the SI voltage signal; the PA2 pin of the chip U1 is connected to the input acquisition module for collecting the M-CH voltage signal; the PA3 pin of the chip U1 is connected to the protection circuit for collecting the LED-M-CH voltage signal; the PA7 pin of the chip U1 is connected to the protection circuit for outputting the LED-M signal; One end of the light-emitting diode LED0 is connected to the PB4 pin of the chip U1 for receiving the Status signal output by the PB4 pin. The other end of the light-emitting diode LED0 is connected to one end of the resistor R7. The other end of the resistor R7 is grounded. The resistor R7 is used to limit current.

10. A sign lamp, characterized in that: The marker lamp comprises the marker lamp circuit according to any one of claims 1 to 9.

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