Projection lamp control circuit with small night light and projection lamp with small night light

Abstract

The application provides a projection lamp control circuit with a small night light and a projection lamp with a small night light, which comprises a master control module, a projection lamp module electrically connected with the master control module, and a power supply module electrically connected with the master control module and the projection lamp module respectively; further comprising an inductor module electrically connected with the master control module and the power supply module respectively, wherein the inductor module controls the master control module to adjust the power of the projection lamp module by whether there is an inductive substance corresponding to the inductor module in the projection tray; when the inductor module senses that the projection tray with the inductive substance enters the projection lamp with a small night light, the inductor module controls the power of the projection lamp module to be adjusted to the power corresponding to the setting of the inductive substance through the master control module; when the inductor module does not sense that the projection tray with the inductive substance enters the projection lamp with a small night light, the inductor module controls the power of the projection lamp module to be adjusted to the power corresponding to the non-setting of the inductive substance through the master control module.

Description

Technical Field

[0001] This invention belongs to the technical field of projection lamps with night lights, and specifically relates to a projection lamp control circuit with a night light and a projection lamp with a night light. Background Technology

[0002] A projection lamp generally includes: a light source, a parallel light lens, a projection sheet, and a projection lens. The light emitted by the light source passes through the parallel light lens, the projection sheet, and the projection lens in sequence before projecting the pattern on the projection sheet onto the outside world. In the prior art, the projection sheet generally includes upper and lower cover plates and a film sandwiched between the upper and lower cover plates. When the temperature of the film is greater than or equal to 25°C, the film begins to fade slowly; when the temperature is greater than or equal to 40°C, the film enters a rapid fading stage; when the temperature is greater than or equal to 60°C, the film suffers irreversible high-temperature fading and damage.

[0003] In existing technologies, once a projector lamp is designed and finalized, the power of the light source is fixed and will not change. Generally, projector lamps have two types of light sources: one is a low-power light source, which generates less heat and has less impact on the projection film. The top and bottom covers of the projection film can be made of materials with low heat transfer capacity, such as transparent plastic. The other type is a high-power light source, which generates more heat. If the top and bottom covers of the projection film are made of materials with low heat transfer capacity, the film inside the projection film can easily suffer irreversible high-temperature fading and damage. The projection film needs to be made of materials with better heat transfer capacity, such as transparent glass. However, in the same projector lamp, when the light source power is low, the two types of projection films can be used interchangeably to meet safety requirements. However, if the top and bottom covers are made of materials with better heat transfer capacity, it will increase the cost of the projection film. When the light source power is high, the two types of projection films cannot be used interchangeably because the heat from the light source will damage the film inside the projection film with lower heat transfer capacity in the top and bottom covers, reducing the lifespan of the projection film.

[0004] Therefore, developing a projection lamp that can combine the two types of projection sheets mentioned above and achieve long-term operation while balancing costs has become an urgent problem for those skilled in the art. Summary of the Invention

[0005] The main objective of this invention is to provide a projection lamp control circuit with a night light and a projection lamp with a night light, so as to solve the problems in the background art mentioned above.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A projection lamp control circuit with a night light includes: a main control module, a projection lamp module electrically connected to the main control module, and a power supply module electrically connected to the main control module and the projection lamp module respectively. It also includes: a sensor module electrically connected to the main control module and the power supply module respectively, which controls the main control module to adjust the power of the projection lamp module to the level corresponding to the presence or absence of the sensing substance by sensing whether there is a sensing substance corresponding to the sensor module in the projection tray of the projection lamp with night light. When the sensor module detects that the projection tray with the sensing material has entered the projection lamp with a night light, the sensor module controls the power of the projection lamp module through the main control module to adjust to the power corresponding to the setting of the sensing material. When the sensor module does not detect the projection tray containing the sensing material entering the projection lamp with a night light, the sensor module controls the power of the projection lamp module through the main control module to adjust to the power corresponding to the absence of the sensing material.

[0007] As a preferred embodiment of the control circuit for a projection lamp with a night light, the power supply module includes: a USB power supply circuit and a step-down power supply circuit; the USB power supply circuit includes: an FPC1 interface; the step-down power supply circuit includes: a power supply chip U1, a resistor R2, a capacitor C1, and a capacitor C2; the first pin of the FPC1 interface is electrically connected to one end of the resistor R2, the projection lamp module, and the sensor module, respectively; the second, third, and fourth pins of the FPC1 interface are all grounded; the first pin of the power supply chip U1, one end of the capacitor C1, and one end of the capacitor C2 are all grounded; the second pin of the power supply chip U1 is electrically connected to the other end of the capacitor C2 and the main control module, respectively; and the third pin of the power supply chip U1 is electrically connected to the other end of the resistor R2 and the other end of the capacitor C1, respectively.

[0008] As a preferred embodiment of the control circuit for a projection lamp with a night light, the main control module includes: a main control chip U3, a capacitor C4, and a capacitor C5; the second pin of the main control chip U3 is electrically connected to one end of the capacitor C4, the second pin of the power supply chip U1, and the other end of the capacitor C2, respectively; the third pin of the main control chip U3 is electrically connected to the other end of the capacitor C4 and one end of the capacitor C5, respectively; the other end of the capacitor C5 is grounded; the fourth pin of the main control chip U3 is electrically connected to the projection lamp module; the sixth pin of the main control chip U3 is electrically connected to the sensor module; and the seventh pin of the main control chip U3 is grounded.

[0009] As a preferred embodiment of the control circuit for a projection lamp with a night light, the sensor module includes: a Hall sensor chip U4, resistors R11, R12, and R13, a capacitor C3, and a transistor Q2; the first pin of the Hall sensor chip U4 is electrically connected to the first pin of the FPC1 interface, one end of resistor R2, one end of resistor R11, one end of resistor R12, and one end of capacitor C3; the second pin of the Hall sensor chip U4 is electrically connected to the other end of capacitor C3 and ground; the third pin of the Hall sensor chip U4 is connected to the other end of resistor R12 and one end of resistor R13; the emitter of the transistor Q2 is electrically connected to the sixth pin of the main control chip U3 and the other end of resistor R11; the base of the transistor Q2 is electrically connected to the other end of resistor R13; and the collector of the transistor Q2 is grounded.

[0010] As a preferred embodiment of a projection lamp control circuit with a night light, the projection lamp module includes: a projection lamp chip U2, resistors R3, R6, R7, R8, and R9, an LED chip 6, a diode D1, and a diode D2; the first pin of the projection lamp chip U2 is electrically connected to the first pin of the FPC1 interface and one end of the resistor R2; the second pin of the projection lamp chip U2 is electrically connected to one end of the resistor R3; the other end of the resistor R3 is electrically connected to the fourth pin of the main control chip U3; the fourth pin of the projection lamp chip U2 is electrically connected to one end of the LED chip 6; and the other end of the LED chip 6... One end of the diode is electrically connected to one end of diode D1 and one end of diode D2 respectively. The other ends of diode D1 and diode D2 are electrically connected to the first pin of the FPC1 interface and one end of resistor R2 respectively. The fifth and sixth pins of the projection lamp chip U2 are electrically connected to one end of resistor R6, one end of resistor R7, one end of resistor R8 and one end of resistor R9 respectively. The other ends of resistor R6, resistor R7, resistor R8, resistor R9, the eighth pin and the ninth pin of the projection lamp chip U2 are all grounded.

[0011] As a preferred embodiment of the projection lamp control circuit with a night light, the projection lamp control circuit with a night light further includes: a night light module electrically connected to the main control module and the power supply module respectively. The night light module includes: resistors R1, R4, and R5, a MOSFET Q1, LED1, LED2, LED3, LED4, LED5, and LED7; one end of each of the LEDs is electrically connected to one end of resistor R1, and the other end of each of the LEDs is electrically connected to the other end of resistor R1. One end of the LED1, the other end of the LED2, the other end of the LED3, the other end of the LED4, the other end of the LED5, and the other end of the LED7 are all electrically connected to the first pin of the FPC1 interface and one end of the resistor R2, respectively; the drain of the MOSFET Q1 is electrically connected to the other end of the resistor R1, the gate of the MOSFET Q1 is electrically connected to one end of the resistor R4 and one end of the resistor R5, the source of the MOSFET Q1 is grounded and electrically connected to the other end of the resistor R5, and the other end of the resistor R4 is electrically connected to the first pin of the FPC1 interface and one end of the resistor R2, respectively.

[0012] As a preferred embodiment of the projection lamp control circuit with a night light, the projection lamp control circuit with a night light further includes: a switch module electrically connected to the main control module, one end of the switch module being grounded, and the other end of the switch module being electrically connected to the first pin of the main control chip U3, the switch module being used to control the opening and closing of the projection lamp module and the night light module.

[0013] As a preferred embodiment of the projection lamp control circuit with a night light, the projection lamp control circuit with a night light further includes: a voice control receiving module electrically connected to the main control module, the voice control receiving module including: a microphone MIC1; one end of the microphone MIC1 is grounded, and the other end of the microphone MIC1 is electrically connected to the eighth pin of the main control chip U3.

[0014] The present invention also provides a projection lamp with a night light, comprising: a control circuit board and a light source board disposed at the bottom of the control circuit board and perpendicular to the control circuit board, and further comprising the projection lamp control circuit with a night light as described above; the projection lamp module is disposed on the top surface of the light source board, the night light module and the USB power supply circuit are disposed on the bottom surface of the light source board, and the step-down power supply circuit, the main control module, the switch module, the voice control receiving module and the sensor module are disposed on one side of the control circuit board.

[0015] As a preferred embodiment of a projection lamp with a night light, the projection lamp with a night light further includes: a mounting sleeve, a housing, a telescopic projection lens, a light-transmitting lampshade, and a projection tray; The mounting sleeve is provided with a projection channel running through it from top to bottom. After the light source board is installed at the bottom of the mounting sleeve, the projection lamp module on the top surface of the light source board is located at the bottom opening of the projection channel and emits light towards the projection channel. The control circuit board is installed on one side of the mounting sleeve. The housing is fitted onto the mounting sleeve and the control circuit board. The projection tray can be pulled into the housing at the top of the mounting sleeve. The telescopic projection lens is installed at the opening at the top of the housing. The light emitted by the projection lamp module passes through the projection channel, the projection tray and the telescopic projection lens in sequence to project the projection pattern on the projection tray to the outside. The light-transmitting lampshade is installed at the bottom opening of the housing and covers the bottom surface of the light source board. The USB power cable passes through the light-transmitting lampshade and is electrically connected to the FPC1 interface. The light emitted by the night light module passes through the light-transmitting lampshade and shines out to the outside.

[0016] The beneficial effects of this invention are: This invention provides a control circuit for a projection lamp with a night light and a projection lamp with a night light, comprising: a main control module, a projection lamp module electrically connected to the main control module, and a power supply module electrically connected to both the main control module and the projection lamp module; it also includes: a sensor module electrically connected to both the main control module and the power supply module. The sensor module controls the main control module to adjust the power of the projection lamp module to correspond to the presence of a sensing substance corresponding to the sensor module by detecting whether a sensing substance is present in the projection tray of the projection lamp with the night light. When the sensor module detects that a projection tray with a sensing substance has entered the projection lamp with the night light, the sensor module controls the power of the projection lamp module to correspond to the power of the sensor substance through the main control module; when the sensor module does not detect that a projection tray with a sensing substance has entered the projection lamp with the night light, the sensor module controls the power of the projection lamp module to correspond to the power of the projection lamp module without a sensing substance through the main control module. By configuring a sensor module and a corresponding sensing material, when the sensor module detects the sensing material, it controls the projection lamp module to adjust to a corresponding power level via the main control module. This typically involves increasing the power, thereby increasing the brightness of the projected image without damaging the projection sheet. Conversely, when the sensor module does not detect the sensing material, it controls the projection lamp module to adjust to a corresponding power level via the main control module. This typically involves decreasing the power, thereby dimming the brightness of the projected image to prevent damage to the projection sheet. This approach allows for two different projection brightness levels to be achieved on the same product without damaging the projection sheet, which is beneficial for the promotion of projection lamps with nightlight functionality. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, and all of them fall within the protection scope of the present invention. Figure 1 This is a circuit diagram of the projection lamp control circuit with a night light shown in this invention; Figure 2 yes Figure 1 The flowchart shown is a control circuit for a projector lamp with a night light. Figure 3 yes Figure 1 The circuit diagram shown is for the power supply module of the projector lamp control circuit with a night light. Figure 4 yes Figure 1 The circuit diagram shown is of the main control module of the projection lamp control circuit with a night light. Figure 5 yes Figure 1 The circuit diagram shown is of the sensor module of the projection lamp control circuit with a night light. Figure 6 yes Figure 1 The circuit diagram shown is of a projection lamp module with a projection lamp control circuit that includes a night light. Figure 7 yes Figure 1 The circuit diagram shown is for a night light module with a projection light control circuit that includes a night light. Figure 8 yes Figure 1 The circuit diagram shown is of the switching module of the projection lamp control circuit with a night light. Figure 9 yes Figure 1 The circuit diagram shown is of the sound-controlled receiver module of the projection lamp control circuit with a night light. Figure 10 This is a schematic diagram of the structure of the projection lamp with a night light as shown in this invention; Figure 11 yes Figure 10 A cross-sectional view of a projection lamp with a night light shown; Figure 12 yes Figure 10 An exploded diagram of a projector lamp with a night light shown; Figure 13 yes Figure 10 The circuit diagram shown is for the control circuit board of a projection lamp with a night light. Figure 14 yes Figure 10 The circuit diagram shown is of the top and bottom surfaces of the light source board of the projection lamp with a night light. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a rotatable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the present invention provides a projection lamp control circuit 100 with a night light, which includes: a main control module 110, a projection lamp module 120 electrically connected to the main control module 110, a power supply module 130 electrically connected to the main control module 110 and the projection lamp module 120 respectively, a night light module 140 electrically connected to the main control module 110 and the power supply module 130 respectively, a switch module 150 electrically connected to the main control module 110, and a voice control receiving module 160 electrically connected to the main control module 110. The switch module 150 and the voice control receiving module 160 can both control the projection lamp module 120 and the night light module 140 through the main control module 110. The system also includes a sensor module 170 that is electrically connected to the main control module 110 and the power supply module 130, respectively. By checking whether a sensing substance 180 corresponding to the sensor module 170 is provided in the projection tray of the projection lamp with a night light, the sensor module 170 controls the main control module 110 to adjust the power of the projection lamp module 120 to the level corresponding to the presence or absence of the sensing substance 180. When the sensor module 170 senses that the projection tray with the sensing material 180 has entered the projection lamp with a night light, the sensor module 170 controls the power of the projection lamp module 120 through the main control module 110 to adjust to the power corresponding to the setting of the sensing material 180. When the sensor module 170 does not detect the projection tray with the sensing material 180 entering the projection lamp with a night light, the sensor module 170 controls the projection lamp module 120 through the main control module 110 to adjust the power to the power corresponding to the absence of the sensing material 180.

[0021] To supply power to the main control module 110 and the projection lamp module 120, the power supply module 130 includes a USB power supply circuit 131 and a step-down power supply circuit 132, which are used to provide stable power support for the entire control circuit. The USB power supply circuit 131 includes an FPC1 interface, and the step-down power supply circuit 132 includes a power supply chip U1, a resistor R2, a capacitor C1, and a capacitor C2. The first pin of the FPC1 interface is electrically connected to one end of the resistor R2, the projection lamp module 120, and the sensor module 170, respectively, to provide them with a 5V operating voltage. The second, third, and fourth pins of the FPC1 interface are all grounded. The first pin of the power supply chip U1, one end of the capacitor C1, and one end of the capacitor C2 are all grounded. The second pin of the power supply chip U1 is electrically connected to the other end of the capacitor C2 and the main control module 110, respectively. The third pin of the power supply chip U1 is electrically connected to the other end of the resistor R2 and the other end of the capacitor C1, respectively. The USB power supply circuit 131 utilizes the FPC1 interface to access an external power source, making it compatible with common USB charging devices (such as mobile phone chargers, computer USB ports, and power bank USB ports), offering strong versatility. The step-down power supply circuit 132 uses the power supply chip U1 to step down the 5V input from the USB interface to the operating voltage (e.g., 3.3V) required by the main control module 110. Simultaneously, capacitors C1 and C2 perform filtering to reduce voltage fluctuations, ensuring power supply stability and providing stable and reliable power support for the entire control circuit. Resistor R2 limits the current, protecting the power supply chip U1 from damage due to excessive current and extending the circuit's lifespan.

[0022] To control the entire system, the main control module 110 includes: a main control chip U3, a capacitor C4, and a capacitor C5; the second pin of the main control chip U3 is electrically connected to one end of the capacitor C4, the second pin of the power supply chip U1, and the other end of the capacitor C2, respectively; the third pin of the main control chip U3 is electrically connected to the other end of the capacitor C4 and one end of the capacitor C5, respectively; the other end of the capacitor C5 is grounded; the fourth pin of the main control chip U3 is electrically connected to the projection lamp module 120; the sixth pin of the main control chip U3 is electrically connected to the sensor module 170; and the seventh pin of the main control chip U3 is grounded. The main control chip U3, as the core of the entire control circuit, is responsible for receiving signals from the sensor module 170, the switch module 150, and the voice-controlled receiver module 160, and controlling the working state of the projection lamp module 120 and the night light module 140 according to a preset program. Capacitors C4 and C5 form a filter circuit to stabilize the operating voltage of the main control chip U3, reduce external interference, ensure the signal processing accuracy and operational stability of the main control chip U3, and prevent control failure due to voltage fluctuations.

[0023] To control the power of the projection lamp module 120, the sensor module 170 includes: a Hall sensor chip U4, resistors R11, R12, and R13, a capacitor C3, and a transistor Q2; the first pin of the Hall sensor chip U4 is electrically connected to the first pin of the FPC1 interface, one end of resistor R2, one end of resistor R11, one end of resistor R12, and one end of capacitor C3; the second pin of the Hall sensor chip U4 is electrically connected to the other end of capacitor C3 and ground; the third pin of the Hall sensor chip U4 is connected to the other end of resistor R12 and one end of resistor R13; the emitter of the transistor Q2 is electrically connected to the sixth pin of the main control chip U3 and the other end of resistor R11; the base of the transistor Q2 is electrically connected to the other end of resistor R13; and the collector of the transistor Q2 is grounded.

[0024] In this embodiment, the sensor module 170 is preferably the Hall sensor, and the corresponding sensing material 180 is preferably a magnet. The magnet is embedded in the corresponding position of the projection tray. However, this invention is not limited to the present invention. The sensor module 170 can also be a reed switch, magnetoresistive device, or other magnetic sensing element corresponding to the magnet. The sensor module 170 only needs to be able to respond to changes in magnetic flux. The present invention does not limit this.

[0025] When the projection tray is inserted into the device, the magnet approaches the Hall sensor chip U4. Upon sensing the magnetic field signal, the Hall sensor chip U4 outputs a corresponding electrical signal. This signal, after being divided by resistors R12 and R13, controls the conduction and cutoff of transistor Q2, thereby sending a level signal to the main control chip U3 to identify the status of the projection tray. The Hall sensor chip U4 features contactless operation, low power consumption, long service life, high precision, and high response frequency. It can accurately identify the insertion and removal status of the projection tray and has strong anti-interference capabilities, ensuring the stability of the sensing signal. Capacitor C3 is used for filtering to reduce the impact of external interference on the operation of the Hall sensor chip U4; resistor R11 is used to limit the current, protecting the pins of transistor Q2 and the main control chip U3; resistors R12 and R13 are used for voltage division to adjust the conduction threshold of transistor Q2, ensuring accurate transmission of the sensing signal.

[0026] Specifically, when the projection tray is inserted into the device, the magnet inside the tray approaches the Hall sensor chip U4. After the Hall sensor chip U4 senses the magnetic field, its third pin outputs a high level. This high level is then input to the base of the transistor Q2 after being divided by the resistor R13, causing the transistor Q2 to conduct. The sixth pin of the main control chip U3 receives a low-level signal, determining that a projection tray with the sensing material 180 has been inserted, and thus controlling the projection lamp module 120 to adjust to a higher power (e.g., 4W). When the projection tray is removed, the Hall sensor chip U4 does not sense the magnetic field, its third pin outputs a low level, the transistor Q2 is cut off, and the sixth pin of the main control chip U3 receives a high-level signal, determining that the projection tray has not been inserted, and controlling the projection lamp module 120 to adjust to a lower power (e.g., 0.3W).

[0027] Specifically, the projection lamp module 120 includes: a projection lamp chip U2, resistors R3, R6, R7, R8, and R9, LED6, diodes D1 and D2; the projection lamp chip U2 enables the continuous current drive of the LED6, ensuring stable brightness and extending the lifespan of the LED. The first pin of the projection lamp chip U2 is electrically connected to the first pin of the FPC1 interface and one end of the resistor R2, respectively, and is connected to a 5V operating voltage; the second pin of the projection lamp chip U2 is electrically connected to one end of the resistor R3, and the other end of the resistor R3 is electrically connected to the fourth pin of the main control chip U3. The main control chip U3 controls the output current of the projection lamp chip U2 by outputting a PWM pulse width modulation signal, thereby adjusting the power of the LED6; the fourth pin of the projection lamp chip U2 is connected to the LED6. One end of LED6 is electrically connected, and the other end of LED6 is electrically connected to one end of diode D1 and one end of diode D2, respectively. The other ends of diode D1 and diode D2 are respectively electrically connected to the first pin of the FPC1 interface and one end of resistor R2, forming a circuit. The fifth and sixth pins of the projection lamp chip U2 are respectively electrically connected to one end of resistor R6, one end of resistor R7, one end of resistor R8 and one end of resistor R9, for adjusting the current parameter of the projection lamp chip U2 to ensure the stability of the operating current of LED6. The other ends of resistor R6, resistor R7, resistor R8, resistor R9, the eighth pin and the ninth pin of the projection lamp chip U2 are all grounded to avoid interference.

[0028] The projection lamp chip U2 drives the LED6 to emit light. The main control chip U3 outputs a control signal through its fourth pin, which is transmitted to the second pin of the projection lamp chip U2 via the resistor R3 to control the working state of the projection lamp chip U2 and thus adjust the power of the LED6. The LED6 serves as the projection light source, and its power can be adaptively adjusted according to the state of the projection tray: when a projection tray with the sensing material 180 (magnet) is inserted, the main control chip U3 controls the projection lamp chip U2 to output higher power to ensure a clear and bright projection image; when the projection tray is not inserted or is inserted without the sensing material 180, the main control chip U3 controls the projection lamp chip U2 to output lower power to avoid energy waste caused by direct strong light or damage to the projection sheet in the projection tray. Diodes D1 and D2 are used to protect the LED6 and prevent reverse voltage from damaging it. Therefore, resistors R6, R7, R8, and R9 are used to adjust the operating parameters of the projection lamp chip U2 to ensure its stable operation, while limiting the current and protecting the LED6 and the projection lamp chip U2.

[0029] Specifically, the night light module 140 includes: resistors R1, R4, and R5; a MOSFET Q1; and LEDs LED1, LED2, LED3, LED4, LED5, and LED7. One end of each of the following LEDs is electrically connected to one end of resistor R1: LED1, LED2, LED3, LED4, LED5, and LED7. The other ends of each of the following LEDs are also electrically connected: LED1, LED2, LED3, LED4, LED5, and LED7. The other ends of LED4, LED5, and LED7 are electrically connected to the first pin of the FPC1 interface and one end of resistor R2, respectively. The drain of MOSFET Q1 is electrically connected to the other end of resistor R1, the gate of MOSFET Q1 is electrically connected to one end of resistor R4 and one end of resistor R5, the source of MOSFET Q1 is grounded and electrically connected to the other end of resistor R5, and the other end of resistor R4 is electrically connected to the first pin of the FPC1 interface and one end of resistor R2. The main control module 110 controls the gate voltage of MOSFET Q1 to turn the night light module 140 on and off. When on, MOSFET Q1 is turned on, and LEDs 1-5 and LED7 emit light; when off, MOSFET Q1 is turned off, and the LEDs are extinguished.

[0030] The night light module 140 provides soft nighttime illumination, suitable for scenarios such as infant rooms and bedrooms. The LEDs 1-5 and 7 are low-power LEDs, providing soft light and avoiding eye strain. The MOSFET Q1 serves as the switching element of the night light module 140. The main control module 110 controls the conduction and cutoff of the MOSFET Q1 to turn the night light module 140 on and off. Resistor R1 limits the total current of the night light module 140, protecting the LEDs and the MOSFET Q1. Resistors R4 and R5 are used for voltage division to adjust the gate voltage of the MOSFET Q1, ensuring reliable conduction and cutoff of the MOSFET Q1 and preventing unstable operation of the night light module 140 due to voltage abnormalities. The night light module 140 and the projection light module 120 can operate independently or simultaneously, meeting diverse user needs.

[0031] In order to control the switching of the projection lamp module 120 and the night light module 140, one end of the switch module 150 is grounded, and the other end of the switch module 150 is electrically connected to the first pin of the main control chip U3. The switch module 150 is used to control the opening and closing of the projection lamp module 120 and the night light module 140.

[0032] The switch module 150 is a tactile switch, allowing users to start and stop the entire device by pressing the switch. Users can also switch between the projection lamp module 120 and the night light module 140 using short and long presses (e.g., short press toggles the projection lamp on / off, long press toggles the night light on / off), making operation convenient. The switch module 150 is grounded, has a simple structure, effectively avoids electrostatic interference, and ensures the accuracy of the control signal.

[0033] In order to control the switching of the projection lamp module 120 and the night light module 140, the projection lamp control circuit 100 with night light further includes: a voice control receiving module 160, the voice control receiving module 160 including: a microphone MIC1; one end of the microphone MIC1 is grounded, and the other end of the microphone MIC1 is electrically connected to the eighth pin of the main control chip U3.

[0034] The voice control receiving module 160 receives user voice commands, and the microphone MIC1 converts the voice signal into an electrical signal, which is then transmitted to the main control chip U3. The main control chip U3 processes the electrical signal and controls the operating status of the projection lamp module 120 and the night light module 140 (e.g., voice commands like "turn on the projection lamp" or "turn off the night light"), further improving ease of use and enabling device control without manual operation. The microphone MIC1 is grounded to reduce external interference and ensure the accuracy of voice signal recognition.

[0035] In this invention, the switch module 150 is not limited to the above-mentioned switch, but can also be other switches, such as mechanical tactile switches, distance sensor switches, photoelectric sensor switches, NFC sensor switches, etc. The above switches can control the switching of the projection lamp module 120 and the night light module 140, and this invention does not limit them.

[0036] The operation of the projection light control circuit 100 with a night light is as follows: 1. Power-on startup: Connect the USB power cable to an external power source to power the entire device through the FPC1 interface. The step-down power supply circuit 132 of the power supply module 130 steps down the 5V voltage to 3.3V to power the main control module 110. The main control chip U3 is powered on and reset, and the device enters standby mode.

[0037] 2. Projection Mode Control: When the user presses the touch switch of the switch module 150, the device starts. If the projection tray is not inserted at this time, the Hall sensor chip U4 of the sensor module 170 does not sense the magnetic field, and the main control chip U3 controls the projection lamp module 120 to work at low power, with soft light to avoid direct strong light. When the user inserts the projection tray with a magnet, the Hall sensor chip U4 senses the magnetic field and sends a signal to the main control chip U3. The main control chip U3 controls the projection lamp module 120 to switch to higher power, and the light emitted by the projection lamp module 120 projects a clear projection pattern to the outside world, ensuring that the pattern is clear.

[0038] 3. Night Light Mode Control: When the user presses and holds the touch switch of the switch module 150, the main control chip U3 controls the night light module 140 to turn on, the MOSFET Q1 conducts, and the LEDs LED1-LED5 and LED7 emit light, suitable for nighttime illumination; pressing and holding the switch again turns off the night light module 140. In addition, the user can control the night light via voice commands such as "turn on the night light" and "turn off the night light," which are received by the voice control receiver module 160 and transmitted to the main control chip U3.

[0039] 4. Voice control: When the user issues a preset voice command (such as "turn on the projector" or "turn off the projector"), the microphone MIC1 converts the voice signal into an electrical signal and transmits it to the main control chip U3. After recognizing the command, the main control chip U3 controls the start and stop of the projector module 120. When the "switch mode" command is issued, the main control chip U3 switches the working state of the projector module 120 and the night light module 140.

[0040] 5. Stop working: When the user presses the tactile switch of the switch module 150 again, the device stops working and enters standby mode; unplug the USB power cable to completely disconnect the power to the device.

[0041] like Figure 10 , Figure 11 , Figure 12 , Figure 13 and Figure 14 As shown, the present invention also provides a projection lamp 200 with a night light, including: a control circuit board 210, and a light source board 220 disposed at the bottom of the control circuit board 210 and perpendicular to the control circuit board 210, and also includes the projection lamp control circuit 100 with a night light as described above. The projection lamp module 120 is located on the top surface of the light source board 220, the night light module 140 and the USB power supply circuit 131 are located on the bottom surface of the light source board 220, and the step-down power supply circuit 132, the main control module 110, the switch module 150, the voice control receiver module 160 and the sensor module 170 are located on one side of the control circuit board 210.

[0042] Furthermore, the projection lamp with a night light also includes: a mounting sleeve 230, a housing 240, a telescopic projection lens 250, a light-transmitting lampshade 260, and a projection tray 270; The mounting sleeve 230 is provided with a projection channel 231 that runs through it from top to bottom. After the light source board 220 is installed at the bottom of the mounting sleeve 230, the projection lamp module 120 on the top surface of the light source board 220 is located at the bottom opening of the projection channel 231 and emits light towards the projection channel 231. The control circuit board 210 is installed on one side of the mounting sleeve 230. The housing 240 is sleeved on the mounting sleeve 230 and the control circuit board 210. The projection tray 270 can be pulled into the housing 240 at the top of the mounting sleeve 230. The telescopic projection lens 250 is installed at the opening at the top of the housing 240. The light emitted by the projection lamp module 120 passes through the projection channel 231, the projection tray 270 and the telescopic projection lens 250 in sequence to project the projection pattern on the projection tray 270 to the outside. The light-transmitting lampshade 260 is installed at the bottom opening of the housing 240 and covers the bottom surface of the light source board 220. The USB power cable passes through the light-transmitting lampshade 260 and is electrically connected to the FPC1 interface. The light emitted by the night light module 140 passes through the light-transmitting lampshade 260 and shines out to the outside.

[0043] To dissipate heat from the control circuit board 210 and the light source board 220, the outer side of the mounting sleeve 230 extends outward to form multiple heat dissipation fins 232. The housing 240 has heat dissipation holes 241 at positions corresponding to the mounting sleeve 230. The heat emitted by the heat dissipation fins 232 is dissipated to the outside through the heat dissipation holes 241, thereby enabling the heat emitted by the control circuit board 210 and the light source board 220 to be dissipated to the outside, thus improving the service life of the product.

[0044] Obviously, the above embodiments of the present invention are merely examples to clearly illustrate the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, these obvious variations or modifications arising from the essential spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. A projection light control circuit with a night light, characterized in that, include: The system includes a main control module, a projection lamp module electrically connected to the main control module, and a power supply module electrically connected to both the main control module and the projection lamp module. It also includes: a sensor module electrically connected to the main control module and the power supply module respectively, which controls the main control module to adjust the power of the projection lamp module to the level corresponding to the presence or absence of the sensing substance by sensing whether there is a sensing substance corresponding to the sensor module in the projection tray of the projection lamp with night light. When the sensor module detects that the projection tray with the sensing material has entered the projection lamp with a night light, the sensor module controls the power of the projection lamp module through the main control module to adjust to the power corresponding to the setting of the sensing material. When the sensor module does not detect the projection tray containing the sensing material entering the projection lamp with a night light, the sensor module controls the power of the projection lamp module through the main control module to adjust to the power corresponding to the absence of the sensing material.

2. The projection light control circuit with a night light as described in claim 1, characterized in that, The power supply module includes: a USB power supply circuit and a step-down power supply circuit; The USB power supply circuit includes an FPC1 interface, and the step-down power supply circuit includes a power supply chip U1, a resistor R2, a capacitor C1, and a capacitor C2. The first pin of the FPC1 interface is electrically connected to one end of the resistor R2, the projection lamp module, and the sensor module, respectively. The second, third, and fourth pins of the FPC1 interface are all grounded. The first pin of the power supply chip U1, one end of the capacitor C1, and one end of the capacitor C2 are all grounded. The second pin of the power supply chip U1 is electrically connected to the other end of the capacitor C2 and the main control module, respectively. The third pin of the power supply chip U1 is electrically connected to the other end of the resistor R2 and the other end of the capacitor C1, respectively.

3. The projection light control circuit with a night light as described in claim 2, characterized in that, The main control module includes: a main control chip U3, a capacitor C4, and a capacitor C5; The second pin of the main control chip U3 is electrically connected to one end of the capacitor C4, the second pin of the power supply chip U1, and the other end of the capacitor C2. The third pin of the main control chip U3 is electrically connected to the other end of the capacitor C4 and one end of the capacitor C5. The other end of the capacitor C5 is grounded. The fourth pin of the main control chip U3 is electrically connected to the projection lamp module. The sixth pin of the main control chip U3 is electrically connected to the sensor module. The seventh pin of the main control chip U3 is grounded.

4. The projection light control circuit with a night light as described in claim 3, characterized in that, The sensor module includes: Hall sensor chip U4, resistor R11, resistor R12, resistor R13, capacitor C3, and transistor Q2; The first pin of the Hall sensor chip U4 is electrically connected to the first pin of the FPC1 interface, one end of resistor R2, one end of resistor R11, one end of resistor R12, and one end of capacitor C3. The second pin of the Hall sensor chip U4 is electrically connected to the other end of capacitor C3 and ground. The third pin of the Hall sensor chip U4 is connected to the other end of resistor R12 and one end of resistor R13. The emitter of transistor Q2 is electrically connected to the sixth pin of the main control chip U3 and the other end of resistor R11. The base of transistor Q2 is electrically connected to the other end of resistor R13. The collector of transistor Q2 is grounded.

5. The projection light control circuit with a night light as described in claim 4, characterized in that, The projection lamp module includes: projection lamp chip U2, resistors R3, R6, R7, R8, R9, LED6, diode D1, and diode D2; The first pin of the projection lamp chip U2 is electrically connected to the first pin of the FPC1 interface and one end of the resistor R2. The second pin of the projection lamp chip U2 is electrically connected to one end of the resistor R3. The other end of the resistor R3 is electrically connected to the fourth pin of the main control chip U3. The fourth pin of the projection lamp chip U2 is electrically connected to one end of the LED 6. The other end of the LED 6 is electrically connected to one end of the diode D1 and one end of the diode D2. The other ends of the diodes D1 and D2 are both electrically connected to the first pin of the FPC1 interface and one end of the resistor R2. The fifth and sixth pins of the projection lamp chip U2 are electrically connected to one end of the resistor R6, one end of the resistor R7, one end of the resistor R8, and one end of the resistor R9, respectively. The other ends of the resistors R6, R7, R8, and R9, the eighth pin of the projection lamp chip U2, and the ninth pin of the projection lamp chip U2 are all grounded.

6. The projection light control circuit with a night light as described in claim 5, characterized in that, The projection lamp control circuit with a night light further includes a night light module electrically connected to the main control module and the power supply module respectively. The night light module includes: resistor R1, resistor R4, resistor R5, MOSFET Q1, LED1, LED2, LED3, LED4, LED5 and LED7. One end of each of the LED beads LED1, LED2, LED3, LED4, LED5, and LED7 is electrically connected to one end of the resistor R1. The other ends of each of the LED beads LED1, LED2, LED3, LED4, LED5, and LED7 are electrically connected to the first pin of the FPC1 interface and one end of the resistor R2, respectively. The drain of the MOS transistor Q1 is electrically connected to the other end of the resistor R1. The gate of the MOS transistor Q1 is electrically connected to one end of the resistor R4 and one end of the resistor R5. The source of the MOS transistor Q1 is grounded and electrically connected to the other end of the resistor R5. The other end of the resistor R4 is electrically connected to the first pin of the FPC1 interface and one end of the resistor R2.

7. The projection light control circuit with a night light as described in claim 6, characterized in that, The projection lamp control circuit with a night light further includes: a switch module electrically connected to the main control module, one end of the switch module being grounded, and the other end of the switch module being electrically connected to the first pin of the main control chip U3. The switch module is used to control the opening and closing of the projection lamp module and the night light module.

8. The projection light control circuit with a night light as described in claim 7, characterized in that, The projection light control circuit with a night light also includes: a voice control receiving module electrically connected to the main control module, the voice control receiving module including: a microphone MIC1; One end of the microphone MIC1 is grounded, and the other end of the microphone MIC1 is electrically connected to the eighth pin of the main control chip U3.

9. A projection light with a night light function, comprising: The control circuit board and the light source board disposed at the bottom of the control circuit board and perpendicular to the control circuit board are characterized in that they further include the projection lamp control circuit with a night light as described in claim 8. The projection lamp module is located on the top surface of the light source board, the night light module and the USB power supply circuit are located on the bottom surface of the light source board, and the step-down power supply circuit, the main control module, the switch module, the voice control receiving module and the sensor module are located on one side of the control circuit board.

10. The projection lamp with a night light as described in claim 9, characterized in that, The projection lamp with a night light also includes: a mounting sleeve, a housing, a telescopic projection lens, a light-transmitting lampshade, and a projection tray; The mounting sleeve is provided with a projection channel running through it from top to bottom. After the light source board is installed at the bottom of the mounting sleeve, the projection lamp module on the top surface of the light source board is located at the bottom opening of the projection channel and emits light towards the projection channel. The control circuit board is installed on one side of the mounting sleeve. The housing is fitted onto the mounting sleeve and the control circuit board. The projection tray can be pulled into the housing at the top of the mounting sleeve. The telescopic projection lens is installed at the opening at the top of the housing. The light emitted by the projection lamp module passes through the projection channel, the projection tray and the telescopic projection lens in sequence to project the projection pattern on the projection tray to the outside. The light-transmitting lampshade is installed at the bottom opening of the housing and covers the bottom surface of the light source board. The USB power cable passes through the light-transmitting lampshade and is electrically connected to the FPC1 interface. The light emitted by the night light module passes through the light-transmitting lampshade and shines out to the outside.

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