CN107979893A - A kind of magnet coupled resonant type wireless night-light circuit - Google Patents

Abstract

A magnetically coupled resonant wireless night light circuit, including a power transmitting module and a power receiving module; using a time base chip as a control chip, and setting the inductance coil reasonably, based on the principle of electromagnetic induction, the wireless energy transmission method is adopted to control the The LED light is powered, and the light intensity of the outside world can be sensed through the photoresistor, and the transmission power of the power transmitter can be automatically adjusted to realize intelligent dimming. The wireless power transmission avoids repeated power plugging and unplugging, and improves the safety and service life of electricity. In addition, the invention has simple structure, convenient use, low circuit cost and good practical application value and application prospect.

Description

A magnetically coupled resonant wireless night light circuit

technical field

The invention relates to a magnetic coupling resonance type wireless night light circuit.

Background technique

Night lights are commonly used electrical equipment, and are widely used in bedrooms, especially in families with infants, so that people can get up at night. At present, night lights are generally powered by in-line adapters and dry batteries. Among them, the direct plug-in night light needs to be plugged into the indoor 220V socket, and infants and young children will have a certain curiosity about the night light, so there is a certain potential safety hazard in electricity use, and repeated wiping and unplugging will also affect the night light. The lifespan of the light; dry battery-powered night lights require frequent battery replacements and are not conducive to environmental protection.

Contents of the invention

In order to solve the above technical problems, the present invention provides a magnetic coupling resonant wireless night light circuit.

The present invention is achieved through the following technical solutions.

A magnetic coupling resonant wireless night light circuit provided by the present invention includes a power transmitting module and a power receiving module;

The power transmission module includes a time base chip, a photoresistor, a first potentiometer, a second resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first inductor, a first LED lamp and a field effect tube , where pin 1 of the time base chip is grounded, pin 4 and pin 8 are connected to a 5V power supply, pin 7 and pin 8 are connected to a photoresistor, pin 7 and pin 6 are connected to the first potentiometer, pin 2 and pin 6 are in phase Connection, pin 6 is connected to one end of the second capacitor, pin 5 is connected to one end of the first capacitor, pin 3 is connected to the G pole of the field effect tube; pin 1 and pin 2 of the first potentiometer are short-circuited; one end of the second resistor is connected to 5V power supply, the other end is connected to the positive pole of the first LED light; the negative pole of the first LED light is grounded; one end of the second capacitor is connected to pin 6 of the time base chip, and the other end is grounded; the third capacitor, the fourth capacitor and the first inductor In parallel with each other, one end is connected to the power supply, and the other end is connected to the D pole of the field effect tube; the S pole of the field effect tube is connected to the ground;

The power receiving module includes a second inductor, a fifth capacitor, a sixth capacitor and a second LED lamp, wherein the second inductor, the fifth capacitor, the sixth capacitor and the second LED lamp are connected in parallel.

The time base chip of the power transmitting module is NE555 chip.

The first potentiometer is a 10K adjustable potentiometer.

Both the third capacitor and the fourth capacitor are 100nF capacitors.

The magnitudes of the first inductor and the second inductor are both 40 μH.

The first inductance and the second inductance are inductance coils with a radius of 65 mm, which are wound with enameled wires.

The enameled wires of the first inductor and the second inductor are wound with 25 turns.

Both the fifth capacitor and the sixth capacitor are 100nF capacitors.

The beneficial effect of the present invention is that: the present invention is based on the principle of electromagnetic induction, adopts the way of wireless energy transmission to supply power to the LED lamp, and can feel the intensity of external light through the photoresistor, and automatically adjust the transmission power of the power transmitting end to realize intelligent adjustment. Light, while wireless power transmission avoids repeated power plugging and unplugging, and improves power safety and service life. In addition, the present invention has simple structure, convenient use, and low circuit cost, so it has good practical application value and application prospect.

Description of drawings

Fig. 1 is a schematic diagram of the circuit connection of the present invention.

Detailed ways

The technical solution of the present invention is further described below, but the scope of protection is not limited to the description.

As shown in Figure 1, a magnetically coupled resonant wireless night light circuit includes a power transmitting module and a power receiving module;

The power transmission module includes a time base chip U1, a photoresistor R1, a first potentiometer R2, a second resistor R3, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a first inductor L1 1. The first LED light D1 and the field effect tube Q1, wherein pin 1 of the time base chip U1 is grounded, pin 4 and pin 8 are connected to a 5V power supply, pin 7 and pin 8 are connected to a photoresistor R1, and pin 7 and pin 6 are connected to a photoresistor R1. Indirect access to the first potentiometer R2, pin 2 and pin 6 are connected, pin 6 is connected to one end of the second capacitor C2, pin 5 is connected to one end of the first capacitor C1, pin 3 is connected to the G pole of the field effect transistor Q1; the first Pin 1 and pin 2 of the potentiometer R2 are short-circuited; one end of the second resistor R3 is connected to a 5V power supply, and the other end is connected to the positive pole of the first LED light D1; the negative pole of the first LED light D1 is grounded; one end of the second capacitor C2 is connected to Pin 6 of the time base chip U1, the other end is grounded; the third capacitor C3, the fourth capacitor C4 and the first inductor L1 are connected in parallel, one end is connected to the power supply, and the other end is connected to the D pole of the field effect transistor Q1; the field effect transistor Q1 The S pole is connected to the ground;

The power receiving module includes a second inductor L2, a fifth capacitor C5, a sixth capacitor C6 and a second LED lamp D2, wherein the second inductor L2, the fifth capacitor C5, the sixth capacitor C6 and the second LED lamp D2 are four connected in parallel.

The time base chip U1 of the power transmission module is a NE555 chip.

The potentiometer R2 is a 10K adjustable potentiometer.

Both the third capacitor C3 and the fourth capacitor C4 are 100 nF.

The magnitudes of the inductors L1 and L2 are both 40 μH.

The first inductance L1 and the second inductance L2 are inductance coils with a radius of 65 mm, which are wound with enameled wires.

The enameled wires of the first inductor L1 and the second inductor L2 are wound with 25 turns.

Both the fifth capacitor C5 and the sixth capacitor C6 are 100nF.

In FIG. 1 , the fourth capacitor C4 and the third capacitor C3 are 100nF, and the first inductor L1 is 40uH. The resonance frequency of the capacitor and inductor composed of these three components is 47K Hz. The fifth capacitor C5 and the sixth capacitor C6 are 100nF, the second inductor L2 is 40uH, and the resonant frequency of the capacitor and inductor composed of these three components is also 47K Hz.

When working, the second resistor R3 and the first LED light D1 are used as power indication; the power transmission part is composed of a time base chip U1, a photosensitive resistor R1, a first resistor R2, a first capacitor C1 and a second capacitor C2 to form a multivibrator device, and pin 3 of the time base chip U1 generates a square wave with a pulse width and duty ratio greater than 1 and a frequency close to 47K Hz, and connects the square wave to the G pole of the field effect transistor Q1, thereby controlling the conduction and cutoff of the field effect transistor Q1 .

The resonance circuit composed of the first inductor L1, the third capacitor C3, and the fourth capacitor C4 makes the parallel inductor oscillate near the central resonance frequency through the cut-off and conduction of the field effect transistor Q1, so that the coil generates 47K Hz alternating current, through A changing current produces a changing magnetic field. When the power receiving module is close to a part of the coil of the power transmitting module, the second inductance L2 generates an alternating induced electromotive force, thereby realizing wireless power transmission, and because the second LED lamp D2 has unidirectional conductivity, the LED lamp D2 is lit.

The first potentiometer R2 can change the pulse width duty cycle of the multivibrator to adjust the transmission power by changing the resistance value of the resistor, thereby changing the brightness of the receiving lamp; the photosensitive resistor R1 is a photosensitive element, and its resistance The smaller the resistance value, the larger the duty cycle of the pulse width of the multivibrator, and the larger the transmit power, and the brighter the second LED light D2 to realize automatic dimming.

Based on the principle of electromagnetic induction, the present invention uses wireless energy transmission to supply power to LED lights, and can sense the intensity of external light through a photoresistor, and automatically adjust the transmission power of the power transmitter to realize intelligent dimming, while wireless energy transmission avoids Repeated plugging and unplugging of the power supply is avoided, and the safety and service life of electricity use are improved. In addition, the present invention has simple structure, convenient use, low circuit cost and good practical application value and application prospect.

Claims (8)

1. A magnetically coupled resonant wireless night light circuit, characterized in that: it includes a power transmitting module and a power receiving module; The power transmission module includes a time base chip (U1), a photoresistor (R1), a first potentiometer (R2), a second resistor (R3), a first capacitor (C1), a second capacitor (C2), a third Capacitor (C3), fourth capacitor (C4), first inductor (L1), first LED light (D1) and field effect tube (Q1), where pin 1 of the time base chip (U1) is grounded, pin 4 and pin 8 Connect pins to 5V power supply, connect photoresistor (R1) between pins 7 and 8, connect the first potentiometer (R2) between pins 7 and 6, connect pins 2 and 6, and connect pin 6 to the second One end of the capacitor (C2), the 5th pin is connected to one end of the first capacitor (C1), and the 3rd pin is connected to the G pole of the field effect transistor (Q1); the 1st and 2nd pins of the first potentiometer (R2) are short-circuited; the second One end of the resistor (R3) is connected to the 5V power supply, and the other end is connected to the positive pole of the first LED lamp (D1); the negative pole of the first LED lamp (D1) is grounded; one end of the second capacitor (C2) is connected to the time base chip (U1) 6 feet, the other end is grounded; the third capacitor (C3), the fourth capacitor (C4) and the first inductor (L1) are connected in parallel with each other, one end is connected to the power supply, and the other end is connected to the D pole of the field effect transistor (Q1); The S pole of the field effect transistor (Q1) is connected to the ground; The power receiving module includes a second inductor (L2), a fifth capacitor (C5), a sixth capacitor (C6) and a second LED lamp (D2), wherein the second inductor (L2), the fifth capacitor (C5), The sixth capacitor (C6) and the second LED lamp (D2) are connected in parallel. 2. The magnetic coupling resonant wireless night light circuit according to claim 1, characterized in that: the time base chip (U1) of the power transmitting module is a NE555 chip. 3. The magnetic coupling resonant wireless night light circuit according to claim 1, characterized in that: the first potentiometer (R2) is a 10K adjustable potentiometer. 4. The magnetic coupling resonant wireless night light circuit according to claim 1, characterized in that: the third capacitor (C3) and the fourth capacitor (C4) are both 100nF capacitors. 5. The magnetic coupling resonant wireless night light circuit according to claim 1, characterized in that: the size of the first inductance (L1) and the second inductance (L2) are both 40 μH. 6 . The magnetic coupling resonant wireless night light circuit according to claim 1 , wherein the first inductor ( L1 ) and the second inductor ( L2 ) are inductor coils with a radius of 65 mm, which are wound with enameled wires. 7 . 7 . The magnetic coupling resonant wireless night light circuit according to claim 6 , characterized in that: the enameled wires of the first inductor ( L1 ) and the second inductor ( L2 ) are wound with 25 turns. 8. The magnetic coupling resonant wireless night light circuit according to claim 1, characterized in that: the fifth capacitor (C5) and the sixth capacitor (C6) are both 100nF capacitors.