LED drive circuit

Abstract

The embodiment of the utility model discloses an LED drive circuit, which comprises at least one LED lamp module, a drive module, a control module, a voltage conversion module and a touch switch, the driving module is connected with the LED lamp module, and the control module is connected with the driving module and used for controlling the driving module to drive the LED lamp module to work; the voltage conversion module is connected with an external power supply and is used for converting the voltage of the external power supply into the working voltage required by the LED lamp module, and the touch switch is connected with the voltage conversion module and is used for controlling the voltage conversion module to work; the LED lamp module comprises eight LED lamps, the driving module comprises at least one driving chip, the control module is connected with the driving chip, the driving chip is provided with eight output pins, and each output pin drives one LED, so that a power supply can be manually cut off in time when a circuit breaks down, the service life of a device is prolonged, and the circuit is protected.

Description

Technical Field

[0001] This utility model relates to the field of LED driving technology, and in particular to an LED driving circuit. Background Technology

[0002] LED lights are widely used in various fields due to their high efficiency and long lifespan, including lighting, displays, traffic lights, automotive lighting, and medical equipment. The driving circuit for LED lights typically requires a voltage conversion module to convert the external power supply to the voltage needed by the LED. However, existing voltage conversion modules are generally controlled by a microcontroller to shut down and cannot be manually turned off. When a circuit malfunctions and the microcontroller signal is abnormal, it cannot effectively control the voltage conversion module, thus failing to cut off the power supply in time. This can easily lead to overheating of other components in the circuit due to continuous operation, reducing their lifespan. Utility Model Content

[0003] This utility model provides an LED driver circuit that can manually cut off the power supply when a circuit failure occurs, thereby improving device lifespan and protecting the circuit.

[0004] To achieve the above objectives, this utility model provides an LED driving circuit, including an LED lamp module, a driving module, a control module, a voltage conversion module, and a tactile switch;

[0005] The driving module is connected to the LED lamp module, and the control module is connected to the driving module to control the driving module to drive the LED lamp module to work; the voltage conversion module is connected to an external power supply to convert the voltage of the external power supply into the working voltage required by the LED lamp module; the tactile switch is connected to the voltage conversion module to control the operation of the voltage conversion module.

[0006] The LED module includes eight LEDs, the driving module includes at least one driving chip, the control module is connected to the driving chip, and the driving chip has eight output pins, each of which drives one LED.

[0007] Furthermore, the voltage conversion circuit includes a power chip U1, capacitors CA1, CB1, CH1, CC1, CC2, inductors LL1 and L1, resistors RK1, RK2, RC1, RA2, RB1, and RA3.

[0008] One end of capacitor CA1 and one end of resistor RK1 are connected to the VIN pin of power chip U1. The other end of capacitor CA1 is grounded. The other end of resistor RK1 is connected to one end of capacitor CB1, the EN pin of power chip U1, and the first end of tactile switch. The VIN pin of power chip U1 is connected to an external power supply. The second end of tactile switch is grounded. The other end of capacitor CB1 is grounded. The CB pin of power chip U1 is connected to one end of inductor LL1 through capacitor CH1. The other end of inductor LL1 is connected to one end of resistor RK2, one end of capacitor CC1, one end of capacitor CC2, one end of resistor RA2, and one end of inductor L1. The other ends of resistor RK2 and resistor RC1 are both connected to the FB pin of power chip U1. The other end of resistor RC1 is grounded. The other ends of capacitor CC1, capacitor CC2, and resistor RA2 are all grounded. The other end of inductor L1 is connected to one end of resistor RB1, and the connection node is used to output the working voltage required by the LED module. The other end of resistor RB1 is grounded through resistor RA3.

[0009] Furthermore, the driving module includes a driving chip U3, and the driving module also includes diodes D1, D2, and D3, resistors RB2, RB3, and RB4, capacitor C5, and capacitor C10.

[0010] One end of capacitor C5 is connected to the cathodes of diodes D1, D2, and D3, the MRn pin of driver chip U3, the VCC pin of driver chip U3, and one end of capacitor C10, and is used to input the operating voltage; the other end of capacitor C5 is grounded, and the other end of capacitor C10, the OEn pin, and the GND pin of driver chip U3 are all grounded; the anode of diode D1 and one end of resistor RB2 are connected to the SDI pin of driver chip U3, the anode of diode D2 and one end of resistor RB4 are connected to the STO pin of driver chip U3, the anode of diode D3 and one end of resistor RB3 are connected to the SHP pin of driver chip U3, and the other ends of resistors RB2, RB3, and RB4 are respectively connected to the control module; the Q0 to Q7 pins of driver chip U3 are respectively connected to the eight LEDs of an LED module.

[0011] Furthermore, the driving module also includes a driving chip U4 and a capacitor C11. The MRn pin and VCC pin of the driving chip U4 and one end of the capacitor C11 are connected and used to input the working voltage. The other end of the capacitor C11 is grounded to the OEn pin and GND pin of the driving chip U4. The SDI pin of the driving chip U4 is connected to the SDO pin of the driving chip U3. The SHP pin of the driving chip U4 is connected to the SHP pin of the driving chip U3. The STO pin of the driving chip U4 is connected to the STO pin of the driving chip U3. The Q0 pin to Q7 pin of the driving chip U4 are respectively connected to eight LEDs of another LED module.

[0012] Furthermore, the Q0 to Q7 pins of the driver chip U3 are respectively connected to the eight LEDs of an LED module through eight resistors.

[0013] Furthermore, the Q0 to Q7 pins of the driver chip U4 are respectively connected to eight LEDs of another LED module through eight additional resistors.

[0014] Furthermore, the voltage of the external power supply is +24V, and the operating voltage is 4.7V.

[0015] Beneficial effects: The LED driver circuit of this utility model connects a tactile switch to the voltage conversion module to control the operation of the voltage conversion module. Thus, when a circuit fault occurs, the voltage conversion module can be stopped by pressing the tactile switch, thereby manually and promptly cutting off the power supply, improving the life of the device, and effectively protecting the circuit. Attached Figure Description

[0016] The technical solution and beneficial effects of this utility model will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the LED driver circuit of this utility model;

[0018] Figure 2 This is a circuit diagram of the voltage conversion module of this utility model;

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

[0020] Figure 4 This is a circuit diagram of an LED lamp module according to this utility model;

[0021] Figure 5 This is a circuit diagram of another LED lamp module of this utility model. Detailed Implementation

[0022] Please refer to the diagram, where the same component symbols represent the same components. The principle of this utility model is illustrated by example in a suitable computing environment. The following description is based on the illustrated specific embodiments of this utility model, and should not be considered as limiting other specific embodiments not detailed herein.

[0023] See Figures 1 to 5 The LED driving circuit of this utility model embodiment includes an LED lamp module 10, a driving module 11, a control module 12, a voltage conversion module 13, and a tactile switch SW1.

[0024] The driver module 11 is connected to the LED lamp module 10, and the control module 12 is connected to the driver module 11 to control the driver module 11 to drive the LED lamp module 10 to work. The voltage conversion module 13 is connected to an external power supply to convert the voltage of the external power supply into the working voltage required by the LED lamp module 10. The tactile switch SW1 is connected to the voltage conversion module to control the operation of the voltage conversion module 13. Therefore, by connecting the tactile switch SW1 to the voltage conversion module 13 to control its operation, when a circuit fault occurs, simply pressing the tactile switch SW1 will stop the power supply to the voltage conversion module 13, thus enabling manual and timely power disconnection, improving device lifespan, and effectively protecting the circuit.

[0025] The external power supply voltage is +24V, and the operating voltage is 4.7V.

[0026] The LED module 10 includes eight LEDs, the driver module 11 includes at least one driver chip, and the control module 12 is connected to the driver chip. The driver chip has eight output pins, each of which drives one LED. Thus, by driving multiple LEDs through an integrated chip, the number of circuit components can be reduced, the circuit can be simplified, and space can be saved.

[0027] Furthermore, such as Figure 2 As shown, the voltage conversion circuit 13 includes a power chip U1, capacitors CA1, CB1, CH1, CC1, CC2, inductors LL1 and L1, resistors RK1, RK2, RC1, RA2, RB1, and RA3.

[0028] One end of capacitor CA1 and one end of resistor RK1 are connected to the VIN pin of power chip U1. The other end of capacitor CA1 is grounded. The other end of resistor RK1 is connected to one end of capacitor CB1, the EN pin of power chip U1, and the first end of tactile switch SW1. The VIN pin of power chip U1 is connected to an external power supply. The second end of tactile switch SW1 is grounded. The other end of capacitor CB1 is grounded. The CB pin of power chip U1 is connected to one end of inductor LL1 through capacitor CH1. The other end of inductor LL1 is connected to one end of resistor RK2, one end of capacitor CC1, one end of capacitor CC2, one end of resistor RA2, and one end of inductor L1. The other end of resistor RK2 and one end of resistor RC1 are both connected to the FB pin of power chip U1. The other end of resistor RC1 is grounded. The other ends of capacitor CC1, capacitor CC2, and resistor RA2 are all grounded. The other end of inductor L1 is connected to one end of resistor RB1, and the connection node is used to output the operating voltage required by LED module 10. The other end of resistor RB1 is grounded through resistor RA3.

[0029] like Figures 3-5 As shown, the drive module 11 includes a drive chip U3, and also includes diodes D1, D2, and D3, resistors RB2, RB3, and RB4, capacitor C5, and capacitor C10.

[0030] One end of capacitor C5 is connected to the cathodes of diodes D1, D2, and D3, the MRn pin of driver chip U3, and the VCC pin of driver chip U3. One end of capacitor C10 is also connected and used for input operating voltage. The other end of capacitor C5 is grounded, and the other end of capacitor C10 is connected to both the OEn pin and the GND pin of driver chip U3. The anode of diode D1 and one end of resistor RB2 are connected to the SDI pin of driver chip U3. The anode of diode D2 and one end of resistor RB4 are connected to the STO pin of driver chip U3. The anode of diode D3 and one end of resistor RB3 are connected to the STO pin of driver chip U3. The SHP pin of the driver chip U3, the other end of resistor RB2, the other end of resistor RB3, and the other end of resistor RB4 are respectively connected to the control module 12, so as to receive the CN_LC_D signal, CN_LC_CK signal, and CN_LC_ST signal from the control module 12 respectively; the Q0 pin to Q7 pin of the driver chip U3 are respectively connected to eight LEDs of an LED module 10, namely LED DG5, LED DG7, LED DG9, LED DG11, LED DG13, LED DG15, LED DG17, and LED DG19.

[0031] Furthermore, the driver module 11 also includes a driver chip U4 and a capacitor C11. The MRn pin and VCC pin of the driver chip U4 and one end of the capacitor C11 are connected and used for inputting the working voltage. The other end of the capacitor C11 is grounded to the OEn pin and GND pin of the driver chip U4. The SDI pin of the driver chip U4 is connected to the SDO pin of the driver chip U3. The SHP pin of the driver chip U4 is connected to the SHP pin of the driver chip U3. The STO pin of the driver chip U4 is connected to the STO pin of the driver chip U3. The Q0 pin to Q7 pin of the driver chip U4 are respectively connected to eight LEDs of another LED module. The eight LEDs are LED DG6, LED DG8, LED DG10, LED DG12, LED DG14, LED DG16, LED DG18, and LED DG20.

[0032] Optionally, pins Q0 to Q7 of driver chip U3 are connected to eight LEDs via eight resistors. Pins Q0 to Q7 of driver chip U4 are connected to eight more LEDs via eight more resistors.

[0033] Understandably, the driver module 11 can contain more driver chips, which can be selected according to the number of LED light modules.

[0034] In this embodiment of the invention, when voltage conversion is required, the tactile switch SW1 is in the open state. At this time, the enable pin EN of the power chip U2 receives a high-level signal, and the power chip U1 starts working, thereby realizing voltage conversion. When the LED module 10 needs to be turned off or a circuit fault occurs, pressing the tactile switch SW1 closes it. At this time, the enable pin EN of the power chip U2 is grounded through the tactile switch, receiving a low-level signal, thus stopping the power chip U1 from working. Furthermore, this embodiment of the invention utilizes a driver chip to drive the LED module 10, which, compared to the driving method using discrete components, reduces the number of components, simplifies the circuit structure, and saves space.

[0035] This document uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An LED driving circuit, characterized in that, It includes at least one LED light module, a driver module, a control module, a voltage conversion module, and a tactile switch; The driving module is connected to the LED lamp module, and the control module is connected to the driving module to control the driving module to drive the LED lamp module to work; the voltage conversion module is connected to an external power supply to convert the voltage of the external power supply into the working voltage required by the LED lamp module; the tactile switch is connected to the voltage conversion module to control the operation of the voltage conversion module. The LED module includes eight LEDs, the driving module includes at least one driving chip, the control module is connected to the driving chip, and the driving chip has eight output pins, each of which drives one LED.

2. The LED driving circuit according to claim 1, characterized in that, The voltage conversion circuit includes a power chip U1, capacitors CA1, CB1, CH1, CC1, CC2, inductors LL1 and L1, resistors RK1, RK2, RC1, RA2, RB1, and RA3. One end of capacitor CA1 and one end of resistor RK1 are connected to the VIN pin of power chip U1. The other end of capacitor CA1 is grounded. The other end of resistor RK1 is connected to one end of capacitor CB1, the EN pin of power chip U1, and the first end of tactile switch. The VIN pin of power chip U1 is connected to an external power supply. The second end of tactile switch is grounded. The other end of capacitor CB1 is grounded. The CB pin of power chip U1 is connected to one end of inductor LL1 through capacitor CH1. The other end of inductor LL1 is connected to one end of resistor RK2, one end of capacitor CC1, one end of capacitor CC2, one end of resistor RA2, and one end of inductor L1. The other ends of resistor RK2 and resistor RC1 are both connected to the FB pin of power chip U1. The other end of resistor RC1 is grounded. The other ends of capacitor CC1, capacitor CC2, and resistor RA2 are all grounded. The other end of inductor L1 is connected to one end of resistor RB1, and the connection node is used to output the working voltage required by the LED module. The other end of resistor RB1 is grounded through resistor RA3.

3. The LED driving circuit according to claim 2, characterized in that, The driving module includes a driving chip U3, and also includes diodes D1, D2, and D3, resistors RB2, RB3, and RB4, capacitor C5, and capacitor C10. One end of capacitor C5 is connected to the cathodes of diodes D1, D2, and D3, the MRn pin of driver chip U3, the VCC pin of driver chip U3, and one end of capacitor C10, and is used to input the operating voltage; the other end of capacitor C5 is grounded, and the other end of capacitor C10, the OEn pin, and the GND pin of driver chip U3 are all grounded; the anode of diode D1 and one end of resistor RB2 are connected to the SDI pin of driver chip U3, the anode of diode D2 and one end of resistor RB4 are connected to the STO pin of driver chip U3, the anode of diode D3 and one end of resistor RB3 are connected to the SHP pin of driver chip U3, and the other ends of resistors RB2, RB3, and RB4 are respectively connected to the control module; the Q0 to Q7 pins of driver chip U3 are respectively connected to the eight LEDs of an LED module.

4. The LED driving circuit according to claim 3, characterized in that, The driving module also includes a driving chip U4 and a capacitor C11. The MRn pin and VCC pin of the driving chip U4 and one end of the capacitor C11 are connected and used to input the working voltage. The other end of the capacitor C11 is grounded to the OEn pin and GND pin of the driving chip U4. The SDI pin of the driving chip U4 is connected to the SDO pin of the driving chip U3. The SHP pin of the driving chip U4 is connected to the SHP pin of the driving chip U3. The STO pin of the driving chip U4 is connected to the STO pin of the driving chip U3. The Q0 pin to Q7 pin of the driving chip U4 are respectively connected to eight LEDs of another LED module.

5. The LED driving circuit according to claim 4, characterized in that, The Q0 to Q7 pins of the driver chip U3 are respectively connected to the eight LEDs of an LED module through eight resistors.

6. The LED driving circuit according to claim 5, characterized in that, The Q0 to Q7 pins of the driver chip U4 are respectively connected to eight LEDs of another LED module through eight additional resistors.

7. The LED driving circuit according to claim 1, characterized in that, The external power supply has a voltage of +24V, and the operating voltage is 4.7V.

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