LED lamp charging control management circuit

Abstract

The utility model relates to LED lamp technical field, propose a kind of LED lamp charging control management circuit, including main control circuit, charging management circuit, battery charging circuit and USB charging circuit, battery charging circuit exports VBAT power supply, USB charging circuit exports 5V power supply, charging management circuit includes voltage stabiliser IC1, zener diode D1, zener diode D2, MOS tube T1 and resistance R1, zener diode D1's anode connects 5V power supply, zener diode D2's anode connects VBAT power supply, cathode connects the input end of voltage stabiliser IC1, MOS tube T1's drain electrode connects VBAT power supply, source electrode connects the input end of voltage stabiliser IC1, the output end of voltage stabiliser IC1 exports 2.5V power supply.Through above-mentioned technical scheme, the problem that traditional power switching circuit lacks intelligent management mechanism in prior art, influence LED work stability is solved.

Description

Technical Field

[0001] This utility model relates to the field of LED lighting technology, specifically to an LED lighting charging control and management circuit. Background Technology

[0002] In the process of popularizing LED lighting technology, traditional driving solutions face significant challenges in high-power application scenarios. Taking automotive headlights and large-screen LCD backlights as examples, these scenarios require driving multiple high-power LED arrays connected in series. Traditional linear regulator solutions suffer from low efficiency, leading to a surge in heat dissipation. While multi-IC switching regulator configurations improve efficiency, they increase system complexity. Furthermore, the color spectrum characteristics of LEDs are strongly correlated with current. Analog dimming methods are prone to color shift issues when adjusting current, and the dimming range is limited (typically only 10:1). In addition, traditional power switching circuits lack intelligent management mechanisms, easily causing voltage fluctuations when switching between USB power and battery power, affecting the stability of LED operation. Utility Model Content

[0003] This invention proposes an LED lamp charging control and management circuit, which solves the problem that traditional power switching circuits in the prior art lack intelligent management mechanisms, thus affecting the stability of LED operation.

[0004] The technical solution of this utility model is as follows:

[0005] An LED lamp charging control and management circuit includes a main control circuit, a charging management circuit, a battery charging circuit, and a USB charging circuit. The battery charging circuit outputs a VBAT power supply, and the USB charging circuit outputs a 5V power supply. The charging management circuit includes a voltage regulator IC1, a Zener diode D1, a Zener diode D2, a MOSFET T1, and a resistor R1. The anode of the Zener diode D1 is connected to the 5V power supply, and the cathode is connected to the input terminal of the voltage regulator IC1. The anode of the Zener diode D2 is connected to the VBAT power supply, and the cathode is connected to the input terminal of the voltage regulator IC1. The 5V power supply is grounded through the resistor R1. The far end of the resistor R1 is connected to the gate of the MOSFET T1. The drain of the MOSFET T1 is connected to the VBAT power supply, and the source is connected to the input terminal of the voltage regulator IC1. The output terminal of the voltage regulator IC1 outputs a 2.5V power supply.

[0006] Furthermore, the battery charging circuit includes a charging chip U1, a MOSFET Q7, resistors R3, R5, R7, and R12. The ST1 and ST2 terminals of the charging chip U1 are connected to the main control circuit. The ST1 and ST2 terminals of the charging chip U1 are connected to a 2.5V power supply through resistors R3 and R5, respectively. The IPRG terminal of the charging chip U1 is connected to the drain of the MOSFET Q7 through resistor R12. The source of the MOSFET Q7 is grounded, and the gate of the MOSFET Q7 is connected to the main control circuit. The gate of the MOSFET Q7 is also connected to a 2.5V power supply through resistor R7. The VOUT terminal of the charging chip U1 outputs a VBAT power supply.

[0007] Furthermore, the USB charging circuit includes a USB interface, a Zener diode D3, a bidirectional thyristor TVS1, a resistor R10, and a capacitor C3. The VBUS terminal of the USB interface is connected to the first terminal of the resistor R10. The second terminal of the resistor R10 outputs a 5V power supply. The second terminal of the resistor R10 is grounded through the Zener diode D3, the bidirectional thyristor TVS1, and the capacitor C3.

[0008] Furthermore, it also includes a voltage feedback circuit, which includes resistors R16, R17, R18, and R19, and capacitors C15 and C17. Resistors R16 and R17 are connected in series between the VBAT power supply and ground. The series connection point of resistors R16 and R17 is connected to the main control circuit, and the series connection point of resistors R16 and R17 is also grounded through capacitor C15. Resistors R18 and R19 are connected in series between the 5V power supply and ground. The series connection point of resistors R18 and R19 is connected to the main control circuit, and the series connection point of resistors R18 and R19 is also grounded through capacitor C17.

[0009] Furthermore, it also includes an indicator light circuit, which includes a load indicator branch and multiple battery indicator branches. The load indicator branch includes a light-emitting diode (LED1), a resistor R2, and a transistor Q1. The base of the transistor Q1 is connected to the main control circuit, the emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is connected to the cathode of the LED1 through the resistor R2. The anode of the LED1 is connected to the VCC power supply. The circuit connection structure of each battery indicator branch is the same as that of the load indicator branch.

[0010] The working principle and beneficial effects of this utility model are as follows:

[0011] In this invention, MOSFET T1 automatically switches between external 5V power supply and battery power, prioritizing external energy utilization, reducing battery charge / discharge cycles, and extending battery life. It also avoids the voltage drop losses of traditional diode switching schemes, improving energy efficiency. Zener diodes D1 / D2 clamp and protect the 5V and VBAT inputs respectively, preventing voltage fluctuations or abnormal surges from damaging downstream circuits. Regulator IC1 outputs a stable 2.5V voltage, ensuring the reliability of the main controller and LED driver, adapting to different input voltage scenarios, and enhancing system robustness.

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0013] Figure 1 This is a circuit diagram of the charging management circuit in this utility model;

[0014] Figure 2 This is a circuit diagram of the battery charging circuit in this utility model;

[0015] Figure 3 This is a circuit diagram of the USB charging circuit in this utility model;

[0016] Figure 4 This is a circuit diagram of the voltage feedback circuit in this utility model;

[0017] Figure 5 This is a circuit diagram of the indicator light circuit in this utility model;

[0018] Figure 6 This is a circuit diagram of the main control circuit in this utility model. Detailed Implementation

[0019] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0020] Example 1

[0021] This embodiment proposes an LED lamp charging control and management circuit, including a main control circuit, a charging management circuit, a battery charging circuit, and a USB charging circuit. The battery charging circuit outputs VBAT power, and the USB charging circuit outputs 5V power.

[0022] like Figure 1As shown, the charging management circuit includes a voltage regulator IC1, a Zener diode D1, a Zener diode D2, a MOSFET T1, and a resistor R1. The anode of Zener diode D1 is connected to a 5V power supply, and the cathode is connected to the input terminal of voltage regulator IC1. The anode of Zener diode D2 is connected to a VBAT power supply, and the cathode is connected to the input terminal of voltage regulator IC1. The 5V power supply is grounded through resistor R1. The far end of resistor R1 is connected to the gate of MOSFET T1. The drain of MOSFET T1 is connected to the VBAT power supply, and the source is connected to the input terminal of voltage regulator IC1. The output terminal of voltage regulator IC1 outputs a 2.5V power supply.

[0023] In this embodiment, the LED lamp charging control and management circuit achieves efficient power supply through intelligent power switching and voltage regulation mechanisms. When the USB is connected, the 5V power supply, after being clamped and protected by the Zener diode D1, is directly used as the input of the charging management circuit. At the same time, the voltage divider resistor R1 cuts off the MOSFET T1, cutting off the power supply path of the battery VBAT, and prioritizing the use of external power to avoid battery damage. When the USB is disconnected, the gate voltage of T1 is pulled high from the battery side, T1 conducts, and VBAT is clamped and protected by the Zener diode D2 before being connected to the circuit, ensuring that the system is powered by the battery when there is no external power supply. The voltage regulator IC1 converts the input voltage (5V or VBAT) into a stable 2.5V output, providing reliable power for the subsequent main control circuit and LED driver, realizing seamless switching between charging and power consumption.

[0024] The system automatically switches between external 5V power and battery power via MOSFET T1, prioritizing external energy use, reducing battery charge / discharge cycles, extending battery life, and avoiding voltage drop losses common in traditional diode switching schemes, thus improving energy efficiency. Zener diodes D1 / D2 clamp the 5V and VBAT inputs respectively, preventing voltage fluctuations or abnormal surges from damaging downstream circuitry. The voltage regulator IC1 outputs a stable 2.5V voltage, ensuring the reliability of the main controller and LED driver, adapting to different input voltage scenarios, and enhancing system robustness.

[0025] Furthermore, such as Figure 2 As shown, the battery charging circuit includes a charging chip U1, a MOSFET Q7, resistors R3, R5, R7, and R12. The ST1 and ST2 terminals of the charging chip U1 are connected to the main control circuit. The ST1 and ST2 terminals of the charging chip U1 are connected to a 2.5V power supply through resistors R3 and R5, respectively. The IPRG terminal of the charging chip U1 is connected to the drain of the MOSFET Q7 through resistor R12. The source of the MOSFET Q7 is grounded, and the gate of the MOSFET Q7 is connected to the main control circuit. The gate of the MOSFET Q7 is also connected to a 2.5V power supply through resistor R7. The VOUT terminal of the charging chip U1 outputs the VBAT power supply.

[0026] In this embodiment, the charging chip U1 is the core control unit. Its ST1 / ST2 terminals communicate with the main control circuit to provide feedback on the charging status (such as charging, fully charged, fault, etc.). The ST1 / ST2 terminals are pulled up to a 2.5V power supply through resistors R3 / R5 to ensure a stable default level and avoid signal interference. The main control circuit regulates the charging current by controlling the gate level of the MOSFET Q7: when the gate is pulled low by the main control, Q7 conducts, and resistor R12 pulls the IPRG terminal of the charging chip U1 low. U1 adjusts the VBAT voltage / current output at the VOUT terminal according to its internal algorithm to achieve constant current or constant voltage charging mode. At the same time, the gate of Q7 is pulled up to 2.5V through resistor R7 to prevent Q7 from being mis-conducted when the main control is not in control. Finally, the stable VBAT power supply output at the VOUT terminal charges the battery and is used by subsequent circuits.

[0027] Furthermore, such as Figure 3 As shown, the USB charging circuit includes a USB interface, a Zener diode D3, a bidirectional thyristor TVS1, a resistor R10, and a capacitor C3. The VBUS terminal of the USB interface is connected to the first terminal of the resistor R10. The second terminal of the resistor R10 outputs a 5V power supply. The second terminal of the resistor R10 is grounded through the Zener diode D3, the bidirectional thyristor TVS1, and the capacitor C3.

[0028] In this embodiment, the VBUS terminal of the USB interface outputs 5V power after current limiting by resistor R10, providing external charging input for the system. A Zener diode D3 is connected in reverse parallel between 5V and ground to clamp the voltage and prevent overvoltage (e.g., if the voltage exceeds the Zener value of D3, it will conduct discharge current). A bidirectional thyristor TVS1 is connected in parallel between 5V and ground to absorb transient high-voltage pulses (such as ESD or lightning surges) and protect subsequent circuits. Capacitor C3 is connected in parallel between 5V and ground to filter high-frequency noise and stabilize the power output. This circuit, through quadruple protection of current limiting, voltage regulation, surge protection, and filtering, ensures the safe and reliable 5V power supply from the USB input, providing a stable power supply for the battery charging circuit or system load.

[0029] Furthermore, it also includes voltage feedback circuits, such as Figure 4 As shown, the voltage feedback circuit includes resistors R16, R17, R18, and R19, and capacitors C15 and C17. Resistors R16 and R17 are connected in series between the VBAT power supply and ground. The series connection point of resistors R16 and R17 is connected to the main control circuit, and the series connection point of resistors R16 and R17 is also grounded through capacitor C15. Resistors R18 and R19 are connected in series between the 5V power supply and ground. The series connection point of resistors R18 and R19 is connected to the main control circuit, and the series connection point of resistors R18 and R19 is also grounded through capacitor C17.

[0030] In this embodiment, a voltage feedback circuit is used to achieve real-time monitoring and stable control of the battery voltage (VBAT) and the USB input voltage (5V): the VBAT power supply is divided by resistors R16 and R17, and the midpoint voltage is fed back to the main control circuit to detect the battery charging status or whether the supply voltage is normal. At the same time, capacitor C15 filters the feedback signal to eliminate high-frequency noise interference. The 5V power supply is also divided by resistors R18 and R19, and the midpoint voltage is fed back to the main control to monitor the stability of the USB input. Capacitor C17 further filters out interference to ensure that the main control obtains accurate voltage sampling values. The main control dynamically adjusts the working mode of the charging chip (such as constant current / constant voltage switching) or the power switching logic according to the feedback voltage, thereby ensuring the safe and efficient operation of the system under different power supply scenarios.

[0031] Furthermore, it also includes indicator light circuits, such as Figure 5 As shown, the indicator circuit includes a load indicator branch and multiple battery indicator branches. The load indicator branch includes a light-emitting diode (LED1), a resistor (R2), and a transistor (Q1). The base of transistor Q1 is connected to the main control circuit, the emitter of transistor Q1 is grounded, the collector of transistor Q1 is connected to the cathode of LED1 through resistor R2, and the anode of LED1 is connected to the VCC power supply. The circuit connection structure of each battery indicator branch is the same as that of the load indicator branch.

[0032] In this embodiment, the main control circuit dynamically controls each indicator branch to achieve status visualization: In the load indicator branch, the main control outputs a level signal to the base of transistor Q1. When the signal is high, Q1 is turned on, and the VCC power supply drives the light-emitting diode LED1 to light up after being current-limited by resistor R2, indicating the working status of the load (such as being powered on or running); Each battery indicator branch adopts the same structure, and the main control allocates different signals to control the on and off of the corresponding transistors, thereby driving independent LEDs to display the battery power (such as multi-level brightness or color differentiation) or charging status (such as flashing to indicate charging, and solid light to indicate fully charged). Resistor R2 plays a current-limiting protection role in each branch to prevent LED overcurrent damage, and the whole system realizes multi-state time-sharing / synchronous indication function.

[0033] like Figure 6 As shown, the main control circuit in this embodiment includes a main control chip U2, which is used to receive detection signals output by other circuits and send corresponding control signals.

[0034] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An LED lamp charging control and management circuit, characterized in that, The system includes a main control circuit, a charging management circuit, a battery charging circuit, and a USB charging circuit. The battery charging circuit outputs VBAT power, and the USB charging circuit outputs 5V power. The charging management circuit includes a voltage regulator IC1, a Zener diode D1, a Zener diode D2, a MOSFET T1, and a resistor R1. The anode of the Zener diode D1 is connected to the 5V power supply, and the cathode is connected to the input terminal of the voltage regulator IC1. The anode of the Zener diode D2 is connected to the VBAT power supply, and the cathode is connected to the input terminal of the voltage regulator IC1. The 5V power supply is grounded through the resistor R1. The far end of the resistor R1 is connected to the gate of the MOSFET T1. The drain of the MOSFET T1 is connected to the VBAT power supply, and the source is connected to the input terminal of the voltage regulator IC1. The output terminal of the voltage regulator IC1 outputs 2.5V power.

2. The LED lamp charging control and management circuit according to claim 1, characterized in that, The battery charging circuit includes a charging chip U1, a MOSFET Q7, resistors R3, R5, R7, and R12. The ST1 and ST2 terminals of the charging chip U1 are connected to the main control circuit. The ST1 and ST2 terminals of the charging chip U1 are connected to a 2.5V power supply through resistors R3 and R5, respectively. The IPRG terminal of the charging chip U1 is connected to the drain of the MOSFET Q7 through resistor R12. The source of the MOSFET Q7 is grounded, and the gate of the MOSFET Q7 is connected to the main control circuit. The gate of the MOSFET Q7 is also connected to a 2.5V power supply through resistor R7. The VOUT terminal of the charging chip U1 outputs a VBAT power supply.

3. The LED lamp charging control and management circuit according to claim 1, characterized in that, The USB charging circuit includes a USB interface, a Zener diode D3, a bidirectional thyristor TVS1, a resistor R10, and a capacitor C3. The VBUS terminal of the USB interface is connected to the first terminal of the resistor R10. The second terminal of the resistor R10 outputs a 5V power supply. The second terminal of the resistor R10 is grounded through the Zener diode D3, the bidirectional thyristor TVS1, and the capacitor C3.

4. The LED lamp charging control and management circuit according to claim 1, characterized in that, It also includes a voltage feedback circuit, which includes resistors R16, R17, R18, and R19, and capacitors C15 and C17. Resistors R16 and R17 are connected in series between the VBAT power supply and ground. The series connection point of resistors R16 and R17 is connected to the main control circuit, and the series connection point of resistors R16 and R17 is also grounded through capacitor C15. Resistors R18 and R19 are connected in series between the 5V power supply and ground. The series connection point of resistors R18 and R19 is connected to the main control circuit, and the series connection point of resistors R18 and R19 is also grounded through capacitor C17.

5. The LED lamp charging control and management circuit according to claim 1, characterized in that, It also includes an indicator light circuit, which includes a load indicator branch and multiple battery indicator branches. The load indicator branch includes a light-emitting diode (LED1), a resistor R2, and a transistor Q1. The base of the transistor Q1 is connected to the main control circuit, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected to the cathode of the LED1 through the resistor R2, and the anode of the LED1 is connected to the VCC power supply. The circuit connection structure of each battery indicator branch is the same as that of the load indicator branch.

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