CN104981078A - LED music lamp based on Bluetooth control - Google Patents

Abstract

The invention discloses a Bluetooth-based LED music lamp, which includes an AC/DC conversion circuit, a Bluetooth music module, a DC/DC circuit, an LED load and a speaker, wherein: the AC/DC conversion circuit is directly connected to the LED load, Power supply for the LED load; the AC/DC conversion circuit, DC/DC circuit and Bluetooth music module are connected in series with the speaker; the Bluetooth music module is connected to the AC/DC conversion circuit; the DC The /DC circuit is directly connected to the speaker to supply power to the speaker. The invention adopts the AC/DC circuit to realize the constant current function, which can directly supply power to the LED load, ensures that the size of the PCB is small, avoids the loss of efficiency on the DC/DC circuit, improves the efficiency, and is conducive to heat dissipation; no need to use Expensive and bulky high-voltage speaker power supply reduces the cost of the whole lamp, shrinks the volume, and is suitable for small-volume lamps; it does not need AC/DC conversion circuit to output high voltage, which improves the reliability of the Bluetooth music module.

Description

A LED music light based on bluetooth control

technical field

The invention belongs to the field of power supplies, and in particular relates to an LED music lamp based on bluetooth control.

Background technique

LED lighting has the advantages of energy saving, long life, good color rendering and fast response, so it is widely used in people's home life. People's demand for intelligent LED lighting has prompted the rapid development of LED lighting technology. At present, LED lamps that can be controlled by mobile phones or remote controls through Bluetooth, LED lamps with music playback function, and other intelligently controlled multifunctional lamps have appeared on the market. Therefore, the driving power supply for such intelligent LED lamps has become one of the technical focuses of intelligent LED lighting technology.

The existing bluetooth-based LED music lamp driving power mainly has the following two schemes:

(1) The input alternating current is converted into a constant voltage output through an AC/DC conversion circuit, and a DC/DC circuit is used to realize constant current and dimming functions to supply power for LED loads; another DC/DC circuit is used for Bluetooth music modules and lamps The speaker is powered, and the Bluetooth music module controls the speaker to emit music. The advantage of this solution is that both the LED load and the Bluetooth music module are powered by a dedicated DC/DC solution, and the performance is relatively stable, but the DC/DC circuit is usually composed of an IC chip, a power inductor, a Schottky diode and an electrolytic capacitor. The cost of multiple DC/DC circuits is high, the EMC (electromagnetic compatibility) is poor, and the size of the PCB board is large, which is not conducive to the promotion of small-volume Bluetooth music lights.

(2) The input alternating current is converted into a constant voltage output through the AC/DC conversion circuit, which directly supplies power to the speaker, and a DC/DC circuit is used to realize constant current and dimming functions, and to supply power to the LED load; the Bluetooth music module adopts LDO (low dropout linear Regulator) circuit power supply. The advantage of this solution is that it only uses one DC/DC circuit for driving, low production cost, good electromagnetic compatibility, and small PCB size, but it still has some disadvantages: the speaker should use a model with high input voltage, and the volume of this type of speaker Larger and higher prices, so the overall cost advantage of lamps is not great.

Contents of the invention

The object of the present invention is to overcome the deficiencies of the prior art, and provide a Bluetooth-controlled LED music lamp with low production cost, good stability and small speaker volume.

The technical solution of the present invention is realized in this way: a kind of LED music lamp based on bluetooth control, comprises AC/DC conversion circuit, bluetooth music module, DC/DC circuit, LED load and loudspeaker, wherein:

The AC/DC conversion circuit is directly connected to the LED load to supply power to the LED load;

The AC/DC conversion circuit, the DC/DC circuit and the Bluetooth music module are connected in series with the speaker in sequence, and the Bluetooth music module is used to control the speaker to play music;

The bluetooth music module is connected to the AC/DC conversion circuit for providing PWM dimming signals for the AC/DC conversion circuit;

The DC/DC circuit is directly connected to the speaker to supply power to the speaker.

Specifically, the AC/DC conversion circuit includes an input rectification and filtering circuit, a switch control IC1, a power switch tube Q1, a transformer, a constant current and constant voltage IC2, a photocoupler, and a secondary dimming circuit. The input rectification and filtering circuit is connected to switch control IC1, the switch control IC1 controls the power switch tube Q1, the power switch tube Q1 is connected to the primary coil of the transformer, the auxiliary coil of the transformer is connected to the switch control IC1; the secondary coil of the transformer is connected to The constant current and constant voltage IC2, the output voltage of the secondary coil of the transformer and the output voltage of the constant current and constant voltage IC2 are respectively connected to the two input terminals of the photocoupler; the output terminal of the photocoupler The switch control IC1 is connected; the secondary coil of the transformer is connected to the secondary dimming circuit.

Further, the output of the input rectification and filtering circuit is connected to the VDD pin of the switch control IC1 through resistors R4 and R5, and the SENSE pin of the switch control IC1 is grounded through the first sampling resistor, and the first sampling resistor includes resistors RS1 and RS2 connected in parallel , the RT pin of the switch control IC1 is grounded through the resistor R10; the GATE pin of the switch control IC1 is connected to the gate of the power switch Q1 through the resistor R7, the drain of the power switch Q1 is connected to the primary coil of the transformer, and the source is connected through the The first sampling resistor is grounded; the transformer auxiliary coil is connected to the VDD pin of the switch control IC1 through the diode D2 and the resistor R6.

Further, the secondary coil of the transformer outputs a voltage VOUT after passing through the rectifier diode D3 and the filter capacitor EC3; the voltage VOUT is connected to the VCC pin of the constant current and constant voltage IC2, and the voltage VOUT is also connected to the photoelectric The input anode of the coupler is connected to the second sampling resistor; the second sampling resistor includes resistors R11, R12, and R13, the resistors R11 and R12 are connected in parallel, and one end of the parallel resistors R11 and R12 is connected to the voltage VOUT, and the other end is connected to Resistor R13, and the other end of R13 is connected to the output ground terminal; the connection node of the resistor R12 and the resistor R13 is connected to the VCTRL pin of the constant current and constant voltage IC2; the ICTRL pin of the constant current and constant voltage IC2 is connected to resistor R24, and the other end of the resistor R24 is connected to the output ground terminal; the VSENSE pin of the constant current constant voltage IC2 is connected to the third sampling resistor through the resistor R25; the third sampling resistor includes parallel resistors R21 and R22, and the first The other ends of the three sampling resistors are connected to the output ground; the VOUT pin of the constant current and constant voltage IC2 is connected to the input cathode of the optocoupler, and the output end of the optocoupler is connected to the FB pin of the switch control IC1.

Specifically, the secondary dimming circuit includes resistors R14, R15, R16, R17, R19, R20 and switch tubes Q2, Q3, and one end of the resistor R14 and R15 is connected in series to a Bluetooth music module to receive a PWM dimming signal. The other end is connected to the output ground terminal; the resistors R14 and R15 divide the voltage, and the connection point of the resistors R14 and R15 is connected to the gate of the switching tube Q2; the resistors R16 and R17 are connected in series, and the voltage VOUT is connected to One end of the resistor R16 and the other end of the resistor R17 are connected to the drain of the switch tube Q2, and the source of the switch tube Q2 is connected to the output ground terminal; the voltage dividing connection point of the resistors R16 and R17 is connected to the gate of the switch tube Q3 The source of the switching tube Q3 is connected to the voltage VOUT, and the drain is connected to the positive pole of the LED load through parallel resistors R19 and 20; the negative pole of the LED load is connected to the output ground terminal through the third sampling resistor;

Further, the secondary dimming circuit also includes a short-circuit protection circuit composed of a resistor R18 and a diode D4 to prevent the LED load from being short-circuited from affecting the work of the Bluetooth music module.

Further, the DC/DC circuit includes DC/DC control IC3, resistors R29, R30, R31, R32, R33, R34, capacitors C11, C12, C13 and inductor L2, and the IN pin of the DC/DC control IC3 is connected to Voltage VOUT, the voltage VOUT is connected to the EN pin of the DC/DC control IC3 through the resistor R29, the IN pin of the DC/DC control IC3 is connected to the output ground terminal through the capacitor C9; the BST pin of the DC/DC control IC3 is connected to the resistor R31, the resistor R31 is connected to the capacitor C12, and the other end of the capacitor C12 is connected to the SW pin of the DC/DC control IC3.

Specifically, the resistor R30 and the capacitor C11 are connected in parallel, one end of the parallel connected R30 and C11 is connected to the output ground terminal, and the other end is connected to the AAM pin of the DC/DC control IC3, and the SW pin of the DC/DC control IC3 is connected to the inductor L2 After outputting 5V voltage, it is used to supply power to the Bluetooth music module and the loudspeaker.

Further, the resistor R33 and the resistor R34 are connected in series, and the connection point of the two is connected to the FB pin of the DC/DC control IC3 through the resistor R32; the capacitor C13 is connected in parallel to both ends of the resistor R33.

Compared with the prior art, the present invention has the following beneficial effects:

1. The AC/DC conversion circuit is used to realize the precise and constant control of the current under the premise of realizing voltage conversion and constant voltage. The PWM dimming is realized through the switching tube, which can directly supply power to the LED load, saving the DC- The DC circuit ensures that the size of the PCB is small, and also eliminates the loss of efficiency in the DC/DC circuit. The efficiency is improved and the heat dissipation effect is good; it does not need to be powered by expensive and large high-voltage speakers, which reduces the cost of the entire lamp. Reduced size, suitable for small volume lamps.

2. In the traditional solution, a DC/DC circuit is used to supply power to the LED load, so the output voltage of the AC/DC conversion circuit connected to the DC/DC circuit needs to be about 3V higher than the voltage drop of the LED lamp beads in the LED load. In this way, the DC/DC circuit IC powered by the Bluetooth music module will bear higher voltage stress, and the AC/DC circuit is adopted in the present invention to realize the constant current function and directly supply power to the LED load, so the output of the AC/DC conversion circuit is not required. High voltage improves the reliability of the Bluetooth music module.

Description of drawings

Fig. 1 is a kind of circuit structural block diagram of the LED music lamp based on bluetooth control of the present invention;

Fig. 2 is a schematic diagram of an AC/DC conversion circuit in a Bluetooth-controlled LED music lamp of the present invention;

Fig. 3 is a schematic diagram of a DC/DC circuit in a Bluetooth-based LED music light according to the present invention.

Detailed ways

The present invention will be further described in conjunction with the accompanying drawings.

As shown in Figure 1, a Bluetooth-based LED music light includes an AC/DC conversion circuit, a Bluetooth music module, a DC/DC circuit, an LED load, and a speaker, wherein:

The AC/DC conversion circuit is directly connected to the LED load to supply power to the LED load;

The AC/DC conversion circuit, the DC/DC circuit and the Bluetooth music module are connected in series with the speaker in sequence, and the Bluetooth music module is used to control the speaker to play music;

The bluetooth music module is connected to the AC/DC conversion circuit for providing PWM dimming signals for the AC/DC conversion circuit;

The DC/DC circuit is directly connected to the speaker to supply power to the speaker.

Specifically, as shown in FIG. 2, the AC/DC conversion circuit includes an input rectification and filtering circuit, a switch control IC1, a power switch tube Q1, a transformer, a constant current and constant voltage IC2, a photocoupler, and a secondary dimming circuit. The input rectification and filtering circuit is connected to switch control IC1, and the switch control IC1 controls the power switch tube Q1, and the power switch tube Q1 is connected to the primary coil of the transformer, and the auxiliary coil of the transformer is connected to the switch control IC1; The secondary coil of the transformer is connected to the constant current and constant voltage IC2, and the output voltage of the secondary coil of the transformer and the output voltage of the constant current and constant voltage IC2 are respectively connected to the two input terminals of the photocoupler; The output terminal of the photocoupler is connected to the switch control IC1; the secondary coil of the transformer is connected to the secondary dimming circuit.

The output of the input rectification filter circuit is connected to the VDD pin of the switch control IC1 through the resistors R4 and R5, and the SENSE pin of the switch control IC1 is grounded through the first sampling resistor, and the first sampling resistor includes resistors RS1 and RS2 connected in parallel. The RT pin of the switch control IC1 is grounded through the resistor R10. The GATE pin of the switch control IC1 is connected to the gate of the power switch Q1 through the resistor R7, the drain of the power switch Q1 is connected to the primary coil of the transformer, and the source is grounded after passing through the first sampling resistor. The auxiliary coil of the transformer is connected to the VDD pin of the switch control IC1 through the diode D2 and the resistor R6.

Further, the secondary coil of the transformer outputs a voltage VOUT after passing through the rectifier diode D3 and the filter capacitor EC3; the voltage VOUT is connected to the VCC pin of the constant current and constant voltage IC2, and the voltage VOUT is also connected to the photoelectric The input anode of the coupler is connected to the second sampling resistor; the second sampling resistor includes resistors R11, R12, and R13, the resistors R11 and R12 are connected in parallel, and one end of the parallel resistors R11 and R12 is connected to the voltage VOUT, and the other end is connected to Resistor R13, and the other end of R13 is connected to the output ground terminal; the connection node between the resistor R12 and the resistor R13 is connected to the VCTRL pin of the constant current and constant voltage IC2; the ICTRL pin of the constant current and constant voltage IC2 is connected Connect the resistor R24, and the other end of the resistor R24 is connected to the output ground terminal; the VSENSE pin of the constant current and constant voltage IC2 is connected to the third sampling resistor through the resistor R25; the third sampling resistor includes parallel resistors R21 and R22, the The other end of the third sampling resistor is connected to the output ground; the VOUT pin of the constant current and constant voltage IC2 is connected to the input cathode of the optocoupler, and the output end of the optocoupler is connected to the FB pin of the switch control IC1.

In addition, the secondary dimming circuit includes resistors R14, R15, R16, R17, R19, R20 and switch tubes Q2, Q3. After the resistors R14 and R15 are connected in series, one end is connected to the Bluetooth music module to receive the PWM dimming signal. One end is connected to the output ground terminal; the resistors R14 and R15 divide the voltage, and the connection point of the resistors R14 and R15 is connected to the gate of the switching tube Q2; the resistors R16 and R17 are connected in series, and the voltage VOUT is connected to the resistor One end of R16 and the other end of resistor R17 are connected to the drain of the switch tube Q2, and the source of the switch tube Q2 is connected to the output ground terminal; the voltage dividing connection point of the resistors R16 and R17 is connected to the gate of the switch tube Q3; The source of the switching tube Q3 is connected to the voltage VOUT, and the drain is connected to the anode of the LED load through parallel resistors R19 and 20; the cathode of the LED load is connected to the output ground terminal through the third sampling resistor. The secondary dimming circuit also includes a short-circuit protection circuit composed of a resistor R18 and a diode D4 to prevent the LED load from being short-circuited from affecting the work of the Bluetooth music module.

As shown in Figure 3, the DC/DC circuit includes DC/DC control IC3, resistors R29, R30, R31, R32, R33, R34, capacitors C11, C12, C13 and inductor L2, the DC/DC control IC3 The IN pin is connected to the voltage VOUT, the voltage VOUT is connected to the EN pin of the DC/DC control IC3 through the resistor R29, and the IN pin of the DC/DC control IC3 is connected to the output ground terminal through the capacitor C9; the BST of the DC/DC control IC3 The pin is connected to a resistor R31, the resistor R31 is connected to a capacitor C12, and the other end of the capacitor C12 is connected to the SW pin of the DC/DC control IC3. The resistor R30 and the capacitor C11 are connected in parallel, one end of the parallel connected R30 and C11 is connected to the output ground terminal, and the other end is connected to the AAM pin of the DC/DC control IC3, and the SW pin of the DC/DC control IC3 is connected to the inductor L2 to output 5V The voltage is used to supply power to the Bluetooth music module and the speaker. The resistor R33 and the resistor R34 are connected in series, and the connection point of the two is connected to the FB pin of the DC/DC control IC3 through the resistor R32; the capacitor C13 is connected in parallel to both ends of the resistor R33.

The present invention has the following beneficial effects:

1. The AC/DC conversion circuit is used to realize the precise and constant control of the current under the premise of realizing the voltage conversion and constant voltage, and realize the switch dimming through the switching tube, which can directly supply power to the LED load, saving the DC- of the LED load. The DC circuit ensures that the size of the PCB is small, and also eliminates the loss of efficiency in the DC/DC circuit. The efficiency is improved and the heat dissipation effect is good; it does not need to be powered by expensive and large high-voltage speakers, which reduces the cost of the entire lamp. Reduced size, suitable for small volume lamps.

2. In the traditional solution, a DC/DC circuit is used to supply power to the LED load, so the output voltage of the AC/DC conversion circuit connected to the DC/DC circuit needs to be about 3V higher than the voltage drop of the LED lamp beads in the LED load. In this way, the DC/DC circuit IC powered by the Bluetooth music module will bear higher voltage stress, and the AC/DC circuit is adopted in the present invention to realize the constant current function and directly supply power to the LED load, so the output of the AC/DC conversion circuit is not required. High voltage improves the reliability of the Bluetooth music module.

According to the disclosure and teaching of the above-mentioned specification, those skilled in the art to which the present invention belongs can also make changes and modifications to the above-mentioned embodiment. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims (9)

1. A kind of LED music light based on bluetooth control, it is characterized in that, comprises AC/DC conversion circuit, bluetooth music module, DC/DC circuit, LED load and loudspeaker, wherein: The AC/DC conversion circuit is directly connected to the LED load to supply power to the LED load; The AC/DC conversion circuit, the DC/DC circuit and the Bluetooth music module are connected in series with the speaker in sequence, and the Bluetooth music module is used to control the speaker to play music; The bluetooth music module is connected to the AC/DC conversion circuit for providing PWM dimming signals for the AC/DC conversion circuit; The DC/DC circuit is directly connected to the speaker to supply power to the speaker. 2. A Bluetooth-based LED music light as claimed in claim 1, wherein the AC/DC conversion circuit includes an input rectification filter circuit, a switch control IC1, a power switch tube Q1, a transformer, a constant current constant Voltage IC2, photocoupler and secondary dimming circuit, the input rectification filter circuit is connected to the switch control IC1, the switch control IC1 controls the power switch tube Q1, and the power switch tube Q1 is connected to the primary coil of the transformer , the auxiliary coil of the transformer is connected to the switch control IC1; the secondary coil of the transformer is connected to the constant current and constant voltage IC2, and the secondary coil of the transformer is connected to the output terminal of the constant current and constant voltage IC2 after rectification and filtering The input terminals of the photocoupler are respectively connected; the output terminal of the photocoupler is connected with the switch control IC1; the secondary coil of the transformer is connected with the secondary dimming circuit. 3. A Bluetooth-based LED music light as claimed in claim 2, wherein the output terminal of the input rectification filter circuit is connected to the VDD pin of the switch control IC1 through resistors R4 and R5, and the switch controls the VDD pin of the IC1. The SENSE pin is grounded through the first sampling resistor RS, and the RT pin of the switch control IC1 is grounded through the resistor R10; the GATE pin of the switch control IC1 is connected to the grid of the power switch tube Q1 through the resistor R7, and the power switch tube The drain of Q1 is connected to the primary coil of the transformer, and the source is grounded through the first sampling resistor RS; the auxiliary coil of the transformer is connected to the VDD pin of the switch control IC1 through the diode D2 and the resistor R6. 4. A kind of LED music light based on bluetooth control as claimed in claim 2, it is characterized in that, after the secondary coil of the transformer passes through the rectifier diode D3 and the filter capacitor EC3, the output voltage VOUT; the voltage VOUT is connected to The VCC pin of the constant current and constant voltage IC2, the voltage VOUT is connected to the input anode of the photocoupler and the second sampling resistor; the second sampling resistor includes resistors R11, R12, R13, and the resistors R11 and R12 is connected in parallel, one end of the resistors R11 and R12 connected in parallel is connected to the voltage VOUT, the other end is connected to the resistor R13, and the other end of the resistor R13 is connected to the output ground terminal; the connection node between the resistor R12 and the resistor R13 is connected to the constant current The VCTRL pin of the constant voltage IC2 is connected; the ICTRL pin of the constant current constant voltage IC2 is connected to a resistor R24, and the other end of the resistor R24 is connected to the output ground terminal; the VSENSE pin of the constant current constant voltage IC2 is connected to the third Sampling resistor; the third sampling resistor includes parallel resistors R21 and R22, the other end of the third sampling resistor is connected to the output ground terminal; the VOUT pin of the constant current and constant voltage IC2 is connected to the input cathode of the photocoupler , the output terminal of the photocoupler is connected to the FB pin of the switch control IC1. 5. A Bluetooth-controlled LED music light as claimed in claim 2, wherein the secondary dimming circuit includes resistors R14, R15, R16, R17, R19, R20 and switch tubes Q2, Q3, After the resistance R14 and R15 are connected in series, one end is connected to the Bluetooth music module to receive the PWM dimming signal, and the other end is connected to the output ground terminal; The gate of Q2 is connected; the resistor R16 and the resistor R17 are connected in series, the voltage VOUT is connected to one end of the resistor R16, the other end of the resistor R17 is connected to the drain of the switching tube Q2, and the source of the switching tube Q2 connected to the output ground terminal; the resistor R16, R17 voltage divider connection point is connected to the gate of the switch tube Q3; the source of the switch tube Q3 is connected to VOUT, and the drain is connected to the LED load through the parallel resistors R19 and R20 positive pole; the negative pole of the LED load is connected to the output ground terminal through the third sampling resistor. 6. A bluetooth-based LED music light as claimed in claim 2, wherein the secondary dimming circuit further includes a short-circuit protection circuit composed of a resistor R18 and a diode D4, which is used to prevent the LED load from being short-circuited. Affect the work of the Bluetooth music module. 7. A Bluetooth-based LED music light as claimed in claim 1, wherein the DC/DC circuit includes a DC/DC control IC3, resistors R29, R30, R31, R32, R33, R34, capacitors C11, C12, C13 and inductor L2, the IN pin of the DC/DC control IC3 is connected to the voltage VOUT, the voltage VOUT is connected to the EN pin of the DC/DC control IC3 through the resistor R29, and the DC/DC control IC3 The IN pin is connected to the output ground terminal through the capacitor C9; the BST pin of the DC/DC control IC3 is connected to the resistor R31, the resistor R31 is connected to the capacitor C12, and the other end of the capacitor C12 is connected to the SW pin of the DC/DC control IC3 . 8. The LED music light based on Bluetooth control according to claim 7, characterized in that, the resistor R30 and the capacitor C11 are connected in parallel, one end of the parallel connected R30 and C11 is connected to the output ground terminal, and the other end is connected to the The AAM pin of the DC/DC control IC3, the SW pin of the DC/DC control IC3 is connected to the inductor L2 and then output to supply power to the Bluetooth music module and the speaker. 9. A Bluetooth-controlled LED music light as claimed in claim 7, wherein the resistor R33 and the resistor R34 are connected in series, and the connection point of the two is connected to the DC/DC control via the resistor R32. The FB pin of IC3; the capacitor C13 is connected in parallel with the two ends of the resistor R33.