LED flashlight driving circuit compatible with dry battery and rechargeable battery

Abstract

An LED flashlight driving circuit compatible with a dry battery and a rechargeable battery comprises a main control circuit, a buck-boost circuit and a battery charging circuit, the battery charging circuit is connected with the buck-boost circuit, the buck-boost circuit is connected with the main control circuit, the battery charging circuit comprises a power management chip U4, a TYPE C power supply and a battery, the TYPE C power supply and the battery are respectively connected with the power management chip U4, and the power management chip U4 is connected with the main control circuit. The battery is a dry battery or a rechargeable battery, the power management chip U4 is connected with a light-emitting diode R and a light-emitting diode G, the light-emitting diode R and the light-emitting diode G are connected in parallel and then are connected with the pin 4 through a resistor R9, the power management chip U4 is connected with a TYPE C power supply through a magnetic bead L2, the battery is connected with the power management chip U4 and is grounded, and the TYPE C power supply is connected with a resistor R7 and a resistor R8 in parallel. The utility model can satisfy the use of a dry battery and a rechargeable battery, and is more flexible to use.

Description

Technical Field

[0001] The utility model relates to a flashlight, in particular to an LED flashlight driving circuit which is compatible with dry batteries and rechargeable batteries. Background Art

[0002] LED flashlights are a common tool used in daily life and in some workplaces. Traditional LED flashlights typically use dry-cell batteries, which are non-rechargeable batteries such as AA or AAA batteries. With this type of battery, the batteries need to be replaced when they run out. To allow for recycling, some use rechargeable batteries, which can be recharged when they run out. Both of these use a single battery type, and the internal circuit structure of existing LED flashlights can often only accommodate one type of battery: either dry-cell batteries or rechargeable batteries, making compatibility and interchangeability difficult. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides an LED flashlight driving circuit that is compatible with dry cells and rechargeable batteries.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A LED flashlight drive circuit compatible with dry cells and rechargeable batteries includes a main control circuit, a buck-boost circuit, and a battery charging circuit. The battery charging circuit is connected to the buck-boost circuit, which is connected to the main control circuit. The battery charging circuit includes a power management chip U4, a TYPE C power supply, and a battery. The TYPE C power supply and the battery are respectively connected to the power management chip U4. The battery can be a dry cell or a rechargeable battery.

[0006] As a further improvement, the power management chip U4 has pins 1, 2, 3, 4, 5 and 6. Pin 1 is connected to a light-emitting diode R, pin 5 is connected to a light-emitting diode G, and the light-emitting diode R and the light-emitting diode G are connected in parallel and connected to pin 4 via a resistor R9. Pin 4 is connected to a TYPE C power supply via a magnetic bead L2. Pin 3 is connected to a buck-boost circuit through a line to deliver power to the buck-boost circuit. One end of the battery is connected to pin 3, and the other end is connected to pin 2 and grounded. Resistors R7 and R8 are connected in parallel to the TYPE C power supply, and resistors R7 and R8 are grounded.

[0007] As a further improvement, pin 6 of the power management chip U4 is connected to a resistor R10, and pin 3 is connected to a capacitor C3. The resistor R10 and the capacitor C3 are connected to ground, and the magnetic bead L3 is grounded through the capacitor C4.

[0008] As a further improvement, the buck-boost circuit includes a buck-boost chip U3 and a transistor Q2. The buck-boost chip has pins 1, 2, 3, 4 and 5. The base of the transistor Q2 is connected to pin 5, the emitter of the transistor Q2 is connected to pin 4, the collector of the transistor Q2 is connected to the magnetic bead L1, and an LED is connected in parallel between the collector and emitter of the transistor Q2. The magnetic bead L1 is connected to pin 3 of the power management chip U4. The magnetic bead L1 is connected to the main control circuit through a resistor R6, and a capacitor C1 is connected in parallel at both ends of the resistor R6.

[0009] As a further improvement, the emitter of the transistor Q2 is connected to a resistor R11 , the resistor R11 is connected to pin 4 of the buck-boost chip U3 , and the resistor R11 is connected to the main control circuit.

[0010] As a further improvement, the main control circuit includes an MCU controller U1, a boost voltage stabilization module and a MOS tube Q1. The MCU controller U1 is connected to a button S1. The MCU controller U1 is connected to the gate of the MOS tube through a resistor R5. The source of the MOS tube Q1 is grounded and connected to the resistor R5 through a resistor R12. The MCU controller U1 is connected to the boost voltage stabilization module through a resistor R13. The boost voltage stabilization module is connected to a diode D3. The diode D3 is connected to a resistor R11. The diode D3 is connected in parallel to a capacitor C6, and the capacitor C6 is grounded.

[0011] As a further improvement, the boost voltage stabilizing module includes a boost voltage stabilizing chip U2, a diode D2, a resistor L2 and a capacitor C5. The output end of the boost voltage stabilizing chip U2 is connected to the resistor R13, the input end of the boost voltage stabilizing chip U2 is connected to the resistor L2, the resistor L2 is connected to the diode D3, one end of the capacitor C5 is connected to the output end of the voltage stabilizing chip U2 and the other end is grounded, and the two ends of the diode D2 are connected to the input and output ends of the boost voltage stabilizing chip U2.

[0012] As a further improvement, the MCU controller U1 is connected to a voltage stabilizing diode ZD1 , one end of which is connected to the resistor R13 and the other end is grounded.

[0013] As a further improvement, the MCU controller U1 is a single-chip microcomputer PY32F002, the model of the boost voltage regulator chip U2 is BL8530, the model of the buck-boost chip U3 is ZXSC310, and the model of the power management chip U4 is TP4057.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects:

[0015] The invention can realize the flexible use of dry batteries and rechargeable batteries, can be driven by dry batteries alone, can also be driven by rechargeable batteries, and can charge rechargeable batteries, and has strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the circuit framework of the utility model;

[0017] Figure 2 This is a connection diagram of the battery charging circuit in the present utility model;

[0018] Figure 3 This is a schematic diagram of the connection between the main control circuit and the buck-boost circuit of the utility model;

[0019] Figure 4 This is a connection diagram of the main control circuit in the present utility model;

[0020] Figure 5 This is a connection diagram of the boost / step-up circuit in the utility model. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0022] In the description of the present invention, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like are used to indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, they are only for the convenience of describing the present invention 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 limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0023] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, removable connections, or integral connections. They may refer to mechanical connections or electrical connections. They may refer to direct connections or indirect connections through an intermediary, and they may refer to internal communication between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0024] refer to Figure 1-5 As shown, an LED flashlight driving circuit that is compatible with dry cells and rechargeable batteries includes a main control circuit, a buck-boost circuit and a battery charging circuit. The battery charging circuit is connected to the buck-boost circuit, which is connected to the main control circuit. The battery charging circuit includes a power management chip U4, a TYPE C power supply and a battery B1. The TYPE C power supply and the battery are respectively connected to the power management chip U4. The battery is a dry cell or a rechargeable battery. When battery B1 is selected as a dry cell, the main control circuit will be partially disconnected and will not charge the dry cell. At this time, the dry cell provides power for supply. When battery B1 is a rechargeable battery, such as a lithium battery, the main control circuit can charge the rechargeable battery without conflict, achieving precise control and flexible use of compatible dry cells and rechargeable batteries. When designing an LED flashlight, a position for assembling dry cells and a position for assembling rechargeable batteries can be set in the shell. The corresponding control can be achieved in whichever position is equipped with the battery.

[0025] The power management chip U4 has pins 1, 2, 3, 4, 5, and 6. Pin 1 is connected to a light-emitting diode R, and pin 5 is connected to a light-emitting diode G. Light-emitting diodes R and G are connected in parallel and then connected to pin 4 via resistor R9. Pin 4 is connected to a Type C power supply via a ferrite bead L2. Pin 3 is connected to a buck-boost circuit via a circuit to deliver power to the buck-boost circuit. One end of a battery is connected to pin 3, and the other end is connected to pin 2 and grounded. Resistors R7 and R8 are connected in parallel to the Type C power supply, and resistors R7 and R8 are grounded. Light-emitting diodes G and R serve as indicator lights. Power from the power management chip U4 is output via pin 3.

[0026] Pin 6 of the power management chip U4 is connected to resistor R10, and pin 3 is connected to capacitor C3. Resistor R10 and capacitor C3 are connected to ground, and ferrite bead L3 is grounded via capacitor C4. Resistor R10 is a current-limiting resistor, which acts as a current limiter, while capacitors C3 and C4 filter the current.

[0027] When battery B1 is at 1.5V, a single dry cell battery, the Type C power supply is controlled by power management chip U4, shutting down its output and not charging the dry cell battery. At this point, the power supply relies entirely on the dry cell battery. When battery B1 is at 3.7V, the Type C power supply detects the 5V output of the Type C charger through resistors R7 and R8. This voltage is filtered by ferrite bead L2 for interference prevention and then transmitted to power management chip U4 for control of the rechargeable battery charging. LEDs R and G indicate the charging process. This control allows for flexible and compatible use of dry cells and rechargeable batteries.

[0028] The buck-boost circuit includes a buck-boost chip U3 and a transistor Q2. The buck-boost chip has pins 1, 2, 3, 4, and 5. The base of transistor Q2 is connected to pin 5, the emitter of transistor Q2 is connected to pin 4, the collector of transistor Q2 is connected to a magnetic bead L1, and an LED is connected between the collector and emitter of transistor Q2. Magnetic bead L1 is connected to pin 3 of the power management chip U4, and magnetic bead L1 is connected to the main control circuit via resistor R6. Capacitor C1 is connected across resistor R6. The emitter of transistor Q2 is connected to resistor R11, which is connected to pin 4 of the buck-boost chip U3 and the main control circuit. Resistor R11 is a current-limiting resistor that serves to limit current.

[0029] The battery charging circuit supplies current to the buck-boost circuit. Part of the current is supplied to the main control circuit through resistor R6, and part of the current is provided to the boost voltage regulator chip U3 and the LED. After the voltage regulation processing of the boost voltage regulator chip U3, it is supplied to the main control circuit through resistor R11. The main control circuit outputs PWM according to the control requirements and then transmits it back to the buck-boost circuit to control the LED.

[0030] The main control circuit includes an MCU controller U1, a boost voltage stabilization module and a MOS tube Q1. The MCU controller U1 is connected to a button S1. The MCU controller U1 is connected to the gate of the MOS tube through a resistor R5. The source of the MOS tube Q1 is grounded and connected to the resistor R5 through a resistor R12. The MCU controller U1 is connected to the boost voltage stabilization module through a resistor R13. The boost voltage stabilization module is connected to a diode D3. The diode D3 is connected to a resistor R11. The diode D3 is connected in parallel to a capacitor C6, and the capacitor C6 is grounded.

[0031] The boost and voltage stabilizing module includes a boost and voltage stabilizing chip U2, a diode D2, a resistor L2 and a capacitor C5. The output end of the boost and voltage stabilizing chip U2 is connected to the resistor R13, the input end of the boost and voltage stabilizing chip U2 is connected to the resistor L2, the resistor L2 is connected to the diode D3, one end of the capacitor C5 is connected to the output end of the voltage stabilizing chip U2 and the other end is grounded, and the two ends of the diode D2 are connected to the input and output ends of the boost and voltage stabilizing chip U2.

[0032] The MCU controller U1 is connected to a voltage stabilizing diode ZD1, one end of which is connected to the resistor R13 and the other end is grounded. The voltage stabilizing diode ZD1 protects the MCU controller U1 from damage when the power supply voltage rises abnormally.

[0033] In addition, the MCU controller U1 is a single-chip microcomputer PY32F002, the model of the boost voltage regulator chip U2 is BL8530, the model of the buck-boost chip U3 is ZXSC310, and the model of the power management chip U4 is TP4057.

[0034] When the present invention is working, if the battery is a dry cell battery, the Type C power supply is controlled by the power management chip U4, the output is shut down, and the dry cell battery is not charged. If the battery is a rechargeable battery, the corresponding charging operation is performed.

[0035] After power enters the buck-boost circuit, it's processed by buck-boost chip U3 and then fed through resistor R11. It then passes through diode D3, capacitor C6, and resistor L2 to boost-regulator chip U2 for voltage conversion. Diode D3 conducts forward, capacitor 6 stores energy, and the voltage is boosted by boost-regulator chip U2, resistor L2, diode D2, and capacitor C5. Current limiting by resistor R13 provides operating voltage for MCU controller U1. When button S1 is pressed, a different PWM signal is output through pin 3 of MCU controller U3. This signal passes through resistor R5, and resistor R12 limits the current and divides the voltage to drive MOS transistor Q1, controlling the LED output brightness. The energy stored by capacitor C6 ensures the normal power cycle of MCU controller U1.

[0036] It should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A LED flashlight driving circuit compatible with dry cell batteries and rechargeable batteries, characterized in that: It includes a main control circuit, a buck-boost circuit and a battery charging circuit. The battery charging circuit is connected to the buck-boost circuit, which is connected to the main control circuit. The battery charging circuit includes a power management chip U4, a TYPE C power supply and a battery. The TYPE C power supply and the battery are respectively connected to the power management chip U4. The battery is a dry cell or a rechargeable battery.

2. The dry cell and rechargeable battery compatible LED flashlight driving circuit according to claim 1, characterized in that: The power management chip U4 has pins 1, 2, 3, 4, 5 and 6. Pin 1 is connected to a light-emitting diode R, and pin 5 is connected to a light-emitting diode G. The light-emitting diodes R and G are connected in parallel and connected to pin 4 via a resistor R9. Pin 4 is connected to a TYPE C power supply via a magnetic bead L2. Pin 3 is connected to a buck-boost circuit through a line to deliver power to the buck-boost circuit. One end of the battery is connected to pin 3, and the other end is connected to pin 2 and grounded. Resistors R7 and R8 are connected in parallel to the TYPE C power supply, and resistors R7 and R8 are grounded.

3. The dry cell and rechargeable battery compatible LED flashlight driving circuit according to claim 2, characterized in that: Pin 6 of the power management chip U4 is connected to a resistor R10, and pin 3 is connected to a capacitor C3. The resistor R10 and the capacitor C3 are connected to ground, and the magnetic bead L3 is grounded through the capacitor C4.

4. The dry cell and rechargeable battery compatible LED flashlight driving circuit according to claim 3, characterized in that: The buck-boost circuit includes a buck-boost chip U3 and a transistor Q2. The buck-boost chip has pins 1, 2, 3, 4 and 5. The base of the transistor Q2 is connected to pin 5, the emitter of the transistor Q2 is connected to pin 4, the collector of the transistor Q2 is connected to the magnetic bead L1, and an LED is connected in parallel between the collector and emitter of the transistor Q2. The magnetic bead L1 is connected to pin 3 of the power management chip U4. The magnetic bead L1 is connected to the main control circuit through a resistor R6, and a capacitor C1 is connected in parallel at both ends of the resistor R6.

5. The dry cell and rechargeable battery compatible LED flashlight driving circuit according to claim 4, characterized in that: The emitter of the transistor Q2 is connected to a resistor R11 , which is connected to pin 4 of the buck-boost chip U3 , and is also connected to the main control circuit.

6. The dry cell and rechargeable battery compatible LED flashlight driving circuit according to claim 5, characterized in that: The main control circuit includes an MCU controller U1, a boost voltage stabilization module and a MOS tube Q1. The MCU controller U1 is connected to a button S1. The MCU controller U1 is connected to the gate of the MOS tube through a resistor R5. The source of the MOS tube Q1 is grounded and connected to the resistor R5 through a resistor R12. The MCU controller U1 is connected to the boost voltage stabilization module through a resistor R13. The boost voltage stabilization module is connected to a diode D3. The diode D3 is connected to a resistor R11. The diode D3 is connected in parallel to a capacitor C6, and the capacitor C6 is grounded.

7. The dry cell and rechargeable battery compatible LED flashlight driving circuit according to claim 6, characterized in that: The boost and voltage stabilizing module includes a boost and voltage stabilizing chip U2, a diode D2, a resistor L2 and a capacitor C5. The output end of the boost and voltage stabilizing chip U2 is connected to the resistor R13, the input end of the boost and voltage stabilizing chip U2 is connected to the resistor L2, the resistor L2 is connected to the diode D3, one end of the capacitor C5 is connected to the output end of the voltage stabilizing chip U2 and the other end is grounded, and the two ends of the diode D2 are connected to the input and output ends of the boost and voltage stabilizing chip U2.

8. The dry cell and rechargeable battery compatible LED flashlight driving circuit according to claim 7, characterized in that: The MCU controller U1 is connected to a voltage stabilizing diode ZD1 , one end of which is connected to the resistor R13 and the other end of which is grounded.

9. The dry cell and rechargeable battery compatible LED flashlight driving circuit according to claim 8, characterized in that: The MCU controller U1 is a single-chip microcomputer PY32F002, the model of the boost and voltage regulator chip U2 is BL8530, the model of the buck-boost chip U3 is ZXSC310, and the model of the power management chip U4 is TP4057.

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