CN217591149U

CN217591149U - LED drive circuit with battery protection function and corresponding make-up mirror

Info

Publication number: CN217591149U
Application number: CN202221615716.9U
Authority: CN
Inventors: 钟清; 黄驹; 徐辉
Original assignee: Shenzhen Youshi Diantong Technology Co ltd
Current assignee: Shenzhen Youshi Diantong Technology Co ltd
Priority date: 2022-06-24
Filing date: 2022-06-24
Publication date: 2022-10-14
Anticipated expiration: 2032-06-24

Abstract

The utility model provides a LED drive circuit with battery protection function, it includes battery, magnetic induction switch module, voltage stabilizing module, control module, drive module. The battery is used for providing working voltage for the LED driving circuit with the battery protection function, and the magnetic induction switch module comprises a Hall sensor and a first MOS (metal oxide semiconductor) tube. Based on the working state of the Hall sensor, the magnetic induction switch module is used for outputting working voltage through the first MOS tube or isolating the battery from a following circuit. The voltage stabilizing module receives the working voltage and is used for performing voltage stabilizing operation on the working voltage, so that the voltage stabilizing module generates a first voltage. The control module receives the first voltage, and the control module can perform analog-to-digital conversion on the first voltage, so that the control module generates a PWM signal. Based on the PWM signal and the first voltage, the driving module generates a driving signal, and the driving signal is used for driving the LED lamp. The circuit is applied to a makeup mirror.

Description

LED drive circuit with battery protection function and corresponding make-up mirror

Technical Field

The utility model relates to a circuit field, in particular to drive circuit.

Background

In modern society, LED lamps are often built-in to portable makeup mirror. When light is not enough, the portable makeup mirror can utilize the LED lamp to supplement light, so that a user can clearly see the face. The LED lamp is powered by the battery, and if the user does not use the portable make-up mirror for a long time, the battery in the make-up mirror can be over-discharged, and the battery can be irreversibly damaged. Therefore, the battery in the existing make-up mirror has the technical problem of easy over-discharge.

Therefore, it is desirable to provide an LED driving circuit with a battery protection function and a cosmetic mirror for solving the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model provides a LED drive circuit and corresponding makeup mirror with battery protection function has effectively solved the inside battery of current makeup mirror and has had the technical problem that takes place excessive discharge easily.

The utility model provides a LED drive circuit with battery protection function, it includes:

the battery is used for providing working voltage for the LED driving circuit with the battery protection function;

the magnetic induction switch module comprises a Hall sensor and a first MOS tube, and is used for outputting the working voltage or isolating the battery from a circuit behind through the first MOS tube based on the working state of the Hall sensor;

the voltage stabilizing module receives the working voltage and is used for performing voltage stabilizing operation on the working voltage to generate a first voltage;

the control module receives the first voltage and is used for carrying out analog-to-digital conversion on the first voltage so as to generate a PWM signal;

the driving module is used for generating a driving signal based on the PWM signal and the first voltage, and the driving signal is used for driving an LED lamp;

the magnetic induction switch module further comprises a first filtering unit, a first diode and a second diode, the first filtering unit is connected with the battery, the first filtering unit is used for filtering the working voltage, the Hall sensor comprises a first end, a second end and a third end, the first end is connected with the battery, the second end is grounded, a grid electrode of the first MOS tube is connected with the third end and the 5V power supply, a source electrode of the first MOS tube is connected with the battery, a drain electrode of the first MOS tube is used for outputting the working voltage, an anode of the first diode is connected with a drain electrode of the first MOS tube, a cathode of the first diode is connected with the source electrode of the first MOS tube, the first diode is used for flowing current to protect the first MOS tube, an anode of the second diode is connected with the 5V power supply, a cathode of the second diode is connected with the drain electrode of the first MOS tube, and the second diode is used for preventing the voltage from flowing backwards to the 5V power supply.

Further, the magnetic induction switch module further comprises a first resistor and a second resistor, the first resistor is connected in series between the battery and the first end, and the first resistor is used for protecting the hall sensor; one end of the second resistor is connected between the grid electrode of the first MOS tube and the 5V power supply, the other end of the second resistor is grounded, and the second resistor is used for discharging static electricity to protect the first MOS tube.

Further, when the hall sensor does not sense the magnetic field of the magnet, the first MOS transistor is in a conducting state, and the drain electrode of the first MOS transistor is used for outputting the working voltage; when the Hall sensor induces the magnetic field of the magnet, the first MOS tube is in a cut-off state, and the magnetic induction switch module is used for isolating the battery from a circuit behind.

Further, the control module includes a first chip and a second MOS transistor, the first chip includes a VDD pin, a PA0 pin, a PA3 pin, and a PA4 pin, the VDD pin is connected to the voltage stabilizing module, the VDD pin is configured to receive a first voltage, the PWM signal includes a first PWM signal and a second PWM signal, the PA3 pin is configured to output the first PWM signal, and the PA4 pin is configured to output the second PWM signal; the PA0 pin is connected with a grid electrode of a second MOS tube, a source electrode of the second MOS tube is connected with the voltage stabilizing module, and a drain electrode of the second MOS tube is connected with the driving module.

Further, the control module further comprises a touch unit, the chip further comprises a PB0 pin, the PB0 pin is connected with the touch unit, and the touch unit is configured to switch a low-power standby mode and a normal operating mode of the first chip.

Further, the control module further includes an indication unit, the first chip further includes a BP7 pin, the indication unit is connected with the BP7 pin, and the indication unit is configured to indicate whether the voltage regulator module fails.

Further, the driver module includes the second chip, the second chip includes DIM pin, VCC pin, DRV pin, the DIM pin with the PA3 pin is connected, the VCC pin is connected the drain electrode of second MOS pipe, drive signal includes first drive signal and second drive signal, the LED lamp includes first LED lamp and second LED lamp, the DRV pin is used for exporting first drive signal, first drive signal is used for driving first LED lamp.

Further, the driving module comprises a third chip, the third chip comprises a DIM pin, a VCC pin and a DRV pin, the DIM pin is connected to the PA4 pin, the VCC pin is connected to the drain of the second MOS transistor, the DRV pin is used for outputting a second driving signal, and the second driving signal is used for driving a second LED lamp.

Furthermore, the voltage stabilizing module further comprises a second filtering unit, the second filtering unit is connected to the output end of the voltage stabilizing module, and the second filtering unit is used for performing filtering operation on the first voltage.

A makeup mirror comprises the LED drive circuit with the battery protection function.

The utility model discloses compare in prior art, its beneficial effect does: the utility model provides a LED drive circuit with battery protection function, this LED drive circuit are provided with the magnetic induction switch module. When the LED driving circuit works normally, the Hall sensor drives the first MOS tube to be conducted, and the magnetic induction switch module can output working voltage to a circuit behind the Hall sensor. When the LED driving circuit stops working, the first MOS tube is controlled to be cut off based on the Hall sensor, and the battery can be isolated from a circuit behind by the magnetic induction switch module. Therefore, the LED driving circuit can save the power consumption of the following circuit. Because the magnetic induction switch module isolates and disconnects the battery from a circuit behind, the LED driving circuit can effectively save the electric quantity of the battery. And the battery only needs to maintain the quiescent current of the Hall sensor, so that the LED driving circuit can prevent the battery from being over-discharged, prolong the service life of the battery, make the battery more durable and accord with the low-carbon and environment-friendly idea. This LED drive circuit with battery protection function has effectively solved the inside battery of current makeup mirror and has had the technical problem that takes place overdischarge easily.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments are briefly introduced below, and the drawings in the following description are only corresponding drawings of some embodiments of the present invention.

Fig. 1 is a block diagram of an embodiment of the present invention of an LED driving circuit with a battery protection function.

Fig. 2 is a circuit diagram of an embodiment of the LED driving circuit with battery protection function according to the present invention. One of them.

Fig. 3 is a circuit diagram of an embodiment of the LED driving circuit with battery protection function according to the present invention. And two, respectively.

In the figure, 10, an LED driving circuit having a battery protection function; 11. a battery; 12. a magnetic induction switch module; 121. a first filtering unit; 13. a voltage stabilization module; 131. a second filtering unit; 14. a control module; 141. a touch unit; 142. an indicating unit; 15. and a driving module.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

In the present invention, the directional terms mentioned in the following description, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", refer to the orientation of the drawings, and the directional terms are used for illustration and understanding of the present invention, but not for limiting the present invention.

The terms "first," "second," and the like in the terms of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, nor should they be construed as limiting in any way.

In the drawings, elements having similar structures are denoted by the same reference numerals.

Referring to fig. 1, fig. 2 and fig. 3, the present invention provides an LED driving circuit 10 with a battery 11 protection function, and the LED driving circuit 10 with the battery 11 protection function includes a battery 11, a magnetic induction switch module 12, a voltage stabilizing module 13, a control module 14, and a driving module 15. The battery 11 can output a working voltage through the battery 11 output terminal BAT +, so that the battery 11 can provide the working voltage for the LED driving circuit 10 with the battery 11 protection function, the magnetic induction switch module 12 includes a hall sensor and a first MOS transistor Q2, and the first MOS transistor Q2 is a P-type low-voltage MOS transistor. Based on the operating state of the hall sensor Q1, the magnetic induction switch module 12 is used to output an operating voltage through the first MOS transistor Q2 or to isolate the battery 11 from the following circuit.

Referring to fig. 1, fig. 2 and fig. 3, the magnetic induction switch module 12 further includes a first filter unit 121, a first diode D1 and a second diode D6. The first filtering unit 121 is connected to the battery 11, and the first filtering unit 121 is used for performing a filtering operation on the operating voltage. The first filter unit 121 includes a first filter capacitor C3 and a second filter capacitor C4, and the first filter capacitor C3 is connected in parallel with the second filter capacitor C4. The Hall sensor Q1 comprises a first end a, a second end b and a third end c, the first end a is connected with the battery 11, the second end b is grounded, and the grid electrode of the first MOS tube Q2 is connected with the third end c and the 5V power supply USB. The source electrode of the first MOS tube Q2 is connected with the battery 11, the drain electrode of the first MOS tube Q2 is used for outputting working voltage, the positive electrode of the first diode D1 is connected with the drain electrode of the first MOS tube Q2, the negative electrode of the first diode D1 is connected with the source electrode of the first MOS tube Q2, and the first diode D1 can be used for continuous current so as to protect the first MOS tube. When a higher voltage is present at the drain of the first MOS transistor Q2, the higher voltage can be output through the first diode D1. Therefore, the first diode D1 is arranged to prevent the first MOS transistor Q2 from being damaged by a higher voltage. The positive pole of the second diode D6 is connected with the 5V power supply USB, the negative pole of the second diode D6 is connected with the drain electrode of the first MOS tube Q2, and the second diode D6 can be used for preventing the voltage from flowing backwards to the 5V power supply USB.

Referring to fig. 1, 2 and 3, when the hall sensor Q1 does not sense the magnetic field of the magnet, the hall sensor Q1 outputs a low-level signal to the gate of the first MOS transistor Q2. Therefore, the first MOS tube is in a conducting state, and the source electrode and the drain electrode of the first MOS tube Q2 are conducted. Since the source of the first MOS transistor Q2 is connected to the battery 11, the drain of the first MOS transistor Q2 can output the operating voltage. When the hall sensor Q1 senses the magnetic field of the magnet, the hall sensor Q1 outputs a high-level signal to the gate of the first MOS transistor Q2. Thus, the first MOS transistor Q2 is in an off state. Therefore, the magnetic induction switch module 12 can isolate the battery 11 from the following circuit by the first MOS transistor Q2.

Referring to fig. 1, fig. 2 and fig. 3, the magnetic induction switch module 12 further includes a first resistor R1 and a second resistor R2. The first resistor R1 is connected in series between the battery 11 and the first end a, and the first resistor R1 is used for protecting the hall sensor Q1. Since the first resistor R1 is connected in series between the battery 11 and the first end a, the first resistor R1 can prevent a large current from damaging the hall sensor Q1. One end of the second resistor R2 is connected between the grid of the first MOS transistor Q2 and the 5V power supply USB, the other end of the second resistor R2 is grounded, and the second resistor R2 is used for discharging static electricity to protect the first MOS transistor Q2. The impedance between the gate and the source of the MOS transistor is very large, and if a small amount of static electricity exists between the source and the gate, a very high voltage is generated across the equivalent capacitance between the source and the gate. The voltage is easy to damage the MOS tube, however, the static electricity can be discharged by the resistor, so that the resistor can play a role of protecting the MOS tube. A third resistor R13 is connected between the first MOS transistor Q2 and the 5V power supply USB. A fourth resistor R15 is further connected between the drain electrode and the source electrode of the first MOS transistor Q2, and the third resistor R13 and the fourth resistor R15 are both free-mounted.

Referring to fig. 1, 2 and 3, the voltage stabilizing module 13 receives the working voltage, and the voltage stabilizing module 13 can perform a voltage stabilizing operation on the working voltage. Thus, the voltage stabilization module 13 may generate the first voltage. The voltage stabilizing module 13 includes a fourth chip U4, a first capacitor C5 and a second capacitor C7, where the fourth chip U4 includes a Vin pin and a Vout pin, and the Vin pin is connected to the drain of the first MOS transistor Q2. The voltage stabilizing module 13 further includes a second filtering unit 131, and the second filtering unit 131 includes a third filtering capacitor C8 and a fourth filtering capacitor C6. The second filtering unit 131 is connected to the output end of the voltage stabilizing module 13, and the second filtering unit 131 is configured to perform a filtering operation on the first voltage. One end of the third filter capacitor C8 is connected to the Vout pin, and the other end of the third filter capacitor C8 is grounded. One end of the fourth filter capacitor C6 is connected to the Vout pin, and the other end of the fourth filter capacitor C6 is grounded. One end of the first capacitor C5 is connected to the Vin pin, and the other end of the first capacitor C5 is grounded. One end of the second capacitor C7 is connected to the Vin pin, and the other end of the second capacitor C7 is grounded. The voltage stabilizing module 13 further includes a fifteenth resistor R17, and one end of the fifteenth resistor R17 is connected to the Vin pin. The other end of the fifteenth resistor R17 is connected to the Vout pin, and the fifteenth resistor R17 is a dummy strip.

Referring to fig. 1, 2 and 3, the control module 14 receives the first voltage, and the control module 14 may perform analog-to-digital conversion on the first voltage. Accordingly, the control module 14 generates the PWM signal, and the control module 14 includes a first chip U1 and a second MOS transistor Q3. The first chip U1 comprises a VDD pin, a PA0 pin, a PA3 pin and a PA4 pin, wherein the VDD pin is connected with the voltage stabilizing module 13, and the VDD pin is used for receiving a first voltage. The PWM signals comprise a first PWM signal and a second PWM signal, a pin PA3 is used for outputting the first PWM signal, and a pin PA4 is used for outputting the second PWM signal. The pin PA0 is connected with the grid electrode of the second MOS tube Q3, the source electrode of the second MOS tube Q3 is connected with the voltage stabilizing module 13, and the drain electrode of the second MOS tube Q3 is connected with the driving module 15. The first chip U1 includes a PA5 pin, a PA6 pin, a PA7 pin, and a GND pin, and the control module 14 further includes a third capacitor C11, a fourth capacitor C12, and a fifth capacitor C13. One end of the third capacitor C11 is connected to the pin PA7, and the other end of the third capacitor C11 is grounded. One end of the fourth capacitor C12 is connected to the VDD pin, and the other end of the fourth capacitor C12 is grounded. One end of the fifth capacitor C13 is connected to the VDD pin, and the other end of the fifth capacitor C13 is grounded.

Referring to fig. 1, 2 and 3, the control module 14 further includes a touch unit 141, and the first chip U1 further includes a PB0 pin. The PB0 pin is connected to the touch unit 141, and the touch unit 141 is configured to switch the first chip U1 between a standby mode and a normal operating mode with low power consumption. Under the condition that the first chip U1 is powered and no touch operation is performed after 1 minute, the first chip U1 automatically enters a standby mode with low power consumption, and at this time, the first chip U1 reduces power consumption. When the user performs a touch operation on the touch unit 141, the first chip U1 enters the normal operating mode quickly. When the PWM signal is output from the pin PA3 or the pin PA4, the pin PA0 of the first chip U1 outputs a low-level signal to the gate of the second MOS transistor Q3. Thus, the second MOS transistor Q3 is in a conducting state. Further, the second chip U3 and the third chip U2 receive the first voltage, and the second chip U3 and the third chip U2 may normally operate. When the PA3 pin or the PA4 pin stops outputting the PWM signal, the PA0 pin of the first chip U1 outputs a high level signal to the gate of the second MOS transistor Q3. Thus, the second MOS transistor Q3 is in an off state. The second chip U3 and the third chip U2 do not receive the first voltage, and then the second chip U3 and the third chip U2 stop working. Therefore, the touch unit 141 can be used to reduce power consumption of the circuit.

Referring to fig. 1, 2 and 3, the control module 14 further includes an indication unit 142, and the first chip U1 further includes a BP7 pin. The indication unit 142 is connected to the BP7 pin, and the indication unit 142 is used for indicating whether the voltage regulator module 13 has a fault. The indicating unit 142 includes a sixth resistor R16 and a light emitting diode D7, and one end of the sixth resistor R16 is connected to the Vout pin. The other end of the sixth resistor R16 is connected to the anode of the led D7, and the cathode of the led D7 is connected to the BP7 pin. When the voltage stabilizing module 13 fails, the light emitting diode D7 is in an off state. When the voltage stabilizing module 13 works normally, the light emitting diode D7 is in a light emitting state, and the light emitting diode D7 can emit red light. The control module 14 further includes a sixth resistor R12, one end of the sixth resistor R12 is connected to the PB0 pin, and the other end of the sixth resistor R12 is connected to the touch unit 141. The control module 14 further includes a seventh resistor R11 and an eighth resistor R100, one end of the seventh resistor R11 is connected to the Vout pin, and the other end of the seventh resistor R11 is connected to the VDD pin. One end of the eighth resistor R100 is connected to the gate of the second MOS transistor, and the other end of the eighth resistor R100 is grounded.

Referring to fig. 1, 2 and 3, based on the PWM signal and the first voltage, the driving module 15 generates a driving signal, and the driving signal is used for driving the LED lamp. The PWM signal is used to control the second chip U3 and the third chip U2 of the driving module 15, and the first voltage may supply power to the second chip U3 and the third chip U2 of the driving module 15. The second chip U3 comprises a DIM pin, a VCC pin and a DRV pin, the DIM pin is connected with the PA3 pin, and the VCC pin is connected with the drain electrode of the second MOS transistor Q3. The driving signal comprises a first driving signal and a second driving signal, and the LED lamp comprises a first LED lamp and a second LED lamp. The DRV pin is used for outputting a first driving signal, the first driving signal is a low-level signal, and the first driving signal is used for driving a first LED lamp. The first LED lamp comprises an LED lamp CW1, an LED lamp CW2, an LED lamp CW3, an LED lamp CW4, an LED lamp CW5, an LED lamp CW6, an LED lamp CW7 and an LED lamp CW8, and the first LED lamp is a cold white LED lamp. The positive electrode of the first LED lamp is connected to the Vin pin of the fourth chip U4, the positive electrode of the first LED lamp is used for receiving a working voltage, and the negative electrode of the first LED lamp is connected to the DRV pin. The second chip U4 includes a VFB pin and a GND pin, and the driving module 15 includes a ninth resistor R7, a tenth resistor R9, an eleventh resistor R5, and a sixth capacitor C9. One end of the ninth resistor R7 is connected to the VFB pin, the other end of the ninth resistor R7 is grounded, and the GND pin is grounded. One end of the tenth resistor R9 is connected to the PA3 pin of the first chip U1, and the other end of the tenth resistor R9 is connected to the DIM pin of the second chip U3. One end of the eleventh resistor R5 is connected between the tenth resistor R9 and the DIM pin of the second chip U3, and the other end of the eleventh resistor R5 is grounded. One end of the sixth capacitor C9 is connected to the VCC pin of the second chip U3, and the other end of the sixth capacitor C9 is grounded.

Referring to fig. 1, 2 and 3, the third chip U3 includes a DIM pin, a VCC pin and a DRV pin, and the DIM pin is connected to the PA4 pin. The VCC pin is connected with the drain electrode of the second MOS transistor Q3, and the DRV pin is used for outputting a second driving signal. The second driving signal is a low-level signal, and the second driving signal is used for driving a second LED lamp. The second LED lamp comprises an LED lamp WW1, an LED lamp WW2, an LED lamp WW3, an LED lamp WW4, an LED lamp WW5, an LED lamp WW6, an LED lamp WW7 and an LED lamp WW8, and the second LED lamp is a warm white light LED lamp. The positive electrode of the second LED lamp is connected with the Vin pin, the positive electrode of the second LED lamp is used for receiving working voltage, and the negative electrode of the second LED lamp is connected with the DRV pin. The third chip U2 includes a VFB pin and a GND pin, and the driving module 15 includes a twelfth resistor R8, a thirteenth resistor R10, a fourteenth resistor R6, and a seventh capacitor C10. One end of the twelfth resistor R8 is connected to the VFB pin, the other end of the twelfth resistor R8 is grounded, and the GND pin is grounded. One end of the thirteenth resistor R10 is connected to the pin PA4 of the first chip U1, and the other end of the thirteenth resistor R10 is connected to the pin DIM of the third chip U2. One end of the fourteenth resistor R6 is connected between the thirteenth resistor R10 and the DIM pin of the third chip U2, and the other end of the fourteenth resistor R6 is grounded. One end of the seventh capacitor C10 is connected to the VCC pin of the third chip U2, and the other end of the seventh capacitor C10 is grounded.

Referring to fig. 1, 2 and 3, the LED driving circuit 10 with the battery 11 protection function is applied to a make-up mirror. The makeup-supplementing mirror further comprises a magnet, an upper cover and a lower cover, wherein the magnet is arranged on the upper cover, and an LED driving circuit 10 with a battery 11 protection function is arranged on the lower cover. When the upper cover of the makeup mirror is closed, the circuit is positioned under the magnet, the circuit receives the magnetic field of the magnet, and the LED lamp of the makeup mirror is automatically turned off. And, the battery 11 is disconnected from the following circuit. When the upper cover of the makeup mirror is opened, the circuit does not receive the magnetic field of the magnet, the battery 11 and the rear circuit form a circuit path, and the battery 11 supplies power to the rear circuit, so that the circuit can work normally. Moreover, the user can replace the hall sensor with a photosensitive sensor according to different magnetic induction circuits. When the upper cover of the make-up mirror is closed, the illumination of light is reduced, so that the photosensitive sensor sends a low-level signal to control the PMOS tube to be cut off, and the battery 11 is isolated from a circuit behind. According to different magnetic induction circuits required, a user can replace the Hall sensor with an infrared pair tube. When the upper cover of the make-up mirror is closed, the infrared geminate transistors can be detected, so that the infrared geminate transistors can send low-level signals to control the PMOS transistor to be cut off, and the battery 11 is isolated from a circuit behind.

Referring to fig. 1, 2 and 3, the static current of the touch control chip or the key control chip is 30-100 μ a. The quiescent current of the driving chip is generally 30-200 muA, while the quiescent current of the Hall sensor is only 2-5 muA. After the first MOS tube Q2 is cut off, the power consumption of three 30-100 muA current chips can be saved, and the magnetic induction switch module 12 isolates and disconnects the battery 11 from a circuit behind, so that the battery 11 only maintains one Hall sensor 2-5uA quiescent current, and the standby loss of the battery 11 can be effectively lower. Therefore, the LED driving circuit 10 with the battery 11 protection function can achieve the purpose of saving power. The circuit can effectively prevent the over-discharge of the battery 11, prolong the service life of the battery 11, make the battery 11 more durable and accord with the low-carbon and environment-friendly idea.

The utility model discloses a theory of operation does: when the LED driving circuit 10 with the battery 11 protection function normally works, the battery 11 outputs a working voltage, and the source of the first MOS transistor Q2 receives the working voltage. Then, the hall sensor Q1 of the magnetic induction switch module 12 outputs a low-level signal to the gate of the first MOS transistor Q2. Therefore, the first MOS transistor Q2 is turned on, and the drain of the first MOS transistor Q2 outputs the working voltage. The voltage stabilizing module 13 inputs the working voltage through a Vin pin of the fourth chip U4, the fourth chip U4 can perform voltage stabilizing operation on the working voltage, and a Vout pin of the fourth chip U4 outputs a first voltage. The control module 14 inputs the first voltage through a VDD pin of the first chip U1, and the first chip U1 may perform analog-to-digital conversion on the first voltage to generate a first PWM signal and a second PWM signal. The pin PA3 of the first chip U1 outputs a first PWM signal, and the pin PA4 of the first chip U1 outputs a second PWM signal. When the PA3 pin or the PA4 pin has a PWM signal output, the PA0 pin of the first chip U1 outputs a low level signal to the gate of the second MOS transistor Q3, so that the second MOS transistor Q3 is turned on. Accordingly, the control module 14 may output the first voltage to the driving module 15 through the second MOS transistor Q3. The VCC pin of the second chip U3 receives the first voltage, and the DIM pin of the second chip U3 receives the first PWM signal. Subsequently, the DRV pin of the second chip U3 outputs the first driving signal. Further, the first LED lamp is turned on. Meanwhile, the VCC pin of the third chip U2 receives the first voltage, and the DIM pin of the third chip U2 receives the second PWM signal. Subsequently, the DRV pin of the third chip U2 receives the second driving signal. Further, the second LED lamp is turned on.

When the LED driving circuit 10 with the battery 11 protection function stops operating, the battery 11 outputs an operating voltage. However, the hall sensor of the magnetic induction switch module 12 outputs a high-level signal to the gate of the first MOS transistor. The first MOS transistor Q2 is in an off state, and therefore, the voltage regulator module 13, the control module 14, and the driving module 15 cannot receive the operating voltage. Therefore, the magnetic induction switch module 12 can isolate the battery 11 from the following circuit through the first MOS transistor Q2, and the battery 11 only needs to maintain the quiescent current of the hall sensor.

The utility model provides a LED drive circuit with battery protection function, this LED drive circuit are provided with the magnetic induction switch module. When the LED driving circuit works normally, the Hall sensor drives the first MOS tube to be conducted, and the magnetic induction switch module can output working voltage to a circuit behind the Hall sensor. When the LED driving circuit stops working, the first MOS tube is controlled to be cut off based on the Hall sensor, and the battery can be isolated from a circuit behind by the magnetic induction switch module. Therefore, the LED driving circuit can save the power consumption of the following circuit. Because the magnetic induction switch module isolates and disconnects the battery from a circuit behind, the LED driving circuit can effectively save the electric quantity of the battery. And the battery only needs to maintain the quiescent current of the Hall sensor, so that the LED driving circuit can prevent the battery from being over-discharged, prolong the service life of the battery, make the battery more durable and accord with the low-carbon and environment-friendly idea. This LED drive circuit with battery protection function has effectively solved the inside battery of current makeup mirror and has had the technical problem that takes place overdischarge easily.

In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so that the scope of the present invention shall be determined by the scope of the appended claims.

Claims

1. An LED drive circuit with a battery protection function, comprising:

the magnetic induction switch module comprises a Hall sensor and a first MOS tube, and is used for outputting the working voltage or isolating the battery from a following circuit through the first MOS tube based on the working state of the Hall sensor;

2. The LED driving circuit with the battery protection function according to claim 1, wherein the magnetic induction switch module further comprises a first resistor and a second resistor, the first resistor is connected in series between the battery and the first terminal, and the first resistor is used for protecting the Hall sensor; one end of the second resistor is connected between the grid electrode of the first MOS tube and the 5V power supply, the other end of the second resistor is grounded, and the second resistor is used for discharging static electricity to protect the first MOS tube.

3. The LED driving circuit with the battery protection function according to claim 1, wherein when the Hall sensor does not sense a magnetic field of a magnet, the first MOS transistor is in a conducting state, and a drain of the first MOS transistor is used for outputting the operating voltage; when the Hall sensor induces the magnetic field of the magnet, the first MOS tube is in a cut-off state, and the magnetic induction switch module is used for isolating the battery from a circuit behind.

4. The LED driving circuit with the battery protection function according to claim 1, wherein the control module comprises a first chip and a second MOS transistor, the first chip comprises a VDD pin, a PA0 pin, a PA3 pin and a PA4 pin, the VDD pin is connected with the voltage stabilizing module, the VDD pin is used for receiving a first voltage, the PWM signals comprise a first PWM signal and a second PWM signal, the PA3 pin is used for outputting the first PWM signal, and the PA4 pin is used for outputting the second PWM signal; the PA0 pin is connected with a grid electrode of a second MOS tube, a source electrode of the second MOS tube is connected with the voltage stabilizing module, and a drain electrode of the second MOS tube is connected with the driving module.

5. The LED driving circuit with the battery protection function according to claim 4, wherein the control module further comprises a touch unit, the chip further comprises a PB0 pin, the PB0 pin is connected to the touch unit, and the touch unit is configured to switch between a standby mode and a normal operating mode of the first chip with low power consumption.

6. The LED driving circuit with the battery protection function according to claim 4, wherein the control module further comprises an indication unit, the first chip further comprises a BP7 pin, the indication unit is connected with the BP7 pin, and the indication unit is used for indicating whether the voltage regulator module has a fault or not.

7. The LED driving circuit with the battery protection function according to claim 4, wherein the driving module includes a second chip, the second chip includes a DIM pin, a VCC pin, and a DRV pin, the DIM pin is connected to the PA3 pin, the VCC pin is connected to the drain of the second MOS transistor, the driving signals include a first driving signal and a second driving signal, the LED lamp includes a first LED lamp and a second LED lamp, the DRV pin is used for outputting the first driving signal, and the first driving signal is used for driving the first LED lamp.

8. The LED driving circuit with battery protection function of claim 7, wherein the driving module comprises a third chip, the third chip comprises a DIM pin, a VCC pin and a DRV pin, the DIM pin is connected to the PA4 pin, the VCC pin is connected to the drain of the second MOS transistor, the DRV pin is used for outputting a second driving signal, and the second driving signal is used for driving a second LED lamp.

9. The LED driving circuit with the battery protection function according to claim 1, wherein the voltage regulation module further comprises a second filtering unit, the second filtering unit is connected to an output terminal of the voltage regulation module, and the second filtering unit is configured to perform a filtering operation on the first voltage.

10. A makeup mirror comprising the LED driving circuit having a battery protection function according to any one of claims 1 to 9.