Bluetooth light modulator and light modulation system

Abstract

The utility model discloses a Bluetooth light modulator and a light modulation system, and aims to solve the technical problem that the voltage control characteristic and the multi-device use consistency of an existing light modulation method are poor. The system comprises Bluetooth dimmers which are electrically connected with light source equipment to be controlled respectively, a mobile control terminal which is in Bluetooth communication connection with the Bluetooth dimmers, and a wireless remote controller which is in wireless communication connection with the Bluetooth dimmers. The Bluetooth light modulator comprises a power supply module, a power output module, a voltage sampling unit, a feedback voltage stabilizing module and a Bluetooth main control module, wherein the power output module is correspondingly and electrically connected with a rectifying unit and comprises a PWM (Pulse Width Modulation) control unit; the feedback voltage stabilizing module is electrically connected between the PWM control unit and the voltage sampling unit; and the feedback voltage adjusting module is electrically connected between the Bluetooth main control module and the feedback voltage stabilizing module. The dimmer has the advantages that a good voltage stabilization effect can be kept in a wide voltage regulation range, multiple devices can be controlled at the same time, and control, configuration and regulation are convenient and fast.

Description

Technical Field

[0001] The present application relates to the field of LED control technology, and in particular to a Bluetooth dimmer and a dimming system. Background Art

[0002] High-voltage LED light strips use LED as the light source and 220V AC mains as the power supply. They have the characteristics of high brightness and high light efficiency, can emit bright and stable light, and are commonly used for indoor and outdoor decorative lighting to provide indirect lighting, background lighting or functional lighting to create different atmospheres and effects.

[0003] In actual application, it is necessary to adjust the brightness of the high-voltage LED light strip according to actual needs. The inventor knows a dimmer based on thyristor phase angle adjustment, but this type of dimmer is greatly affected by voltage fluctuations, resulting in serious flickering, and the brightness adjustment range is generally less than 80%, and the adjustment range is relatively narrow. In addition, the inventor also knows a method of using a traditional isolated power supply to adjust the voltage range, but the traditional isolated power supply has a narrow voltage adjustment range, and the voltage control and voltage stabilization effect is poor in the low-brightness and low-power segments, and there is a flicker problem. And when facing the control requirements of multiple devices, the above two dimming methods need to be adjusted manually in sequence, and the consistency of multiple devices is poor.

[0004] The information disclosed in this background technology section is only used to deepen the understanding of the background technology of the present disclosure, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to those skilled in the art. Summary of the invention

[0005] In view of at least one of the above technical problems, the present disclosure provides a Bluetooth dimmer and a dimming system, aiming to solve the technical problems of voltage control characteristics and poor consistency in multi-device use of existing dimming methods.

[0006] According to one aspect of the present disclosure, a Bluetooth dimmer is provided, comprising a power module provided with a rectifier unit, a power output module electrically connected to the rectifier unit and comprising a PWM control unit, a voltage sampling unit for sampling the output voltage of the power output module, a feedback voltage stabilizing module electrically connected between the PWM control unit and the voltage sampling unit, a Bluetooth main control module for receiving control signals from the mobile control terminal and the wireless remote controller, and a feedback voltage adjustment module electrically connected between the Bluetooth main control module and the feedback voltage stabilizing module.

[0007] In some embodiments of the present disclosure, the power module further includes a step-down unit electrically connected to the rectifier unit and configured to provide a voltage of a corresponding level to the PWM control unit and the Bluetooth main control module.

[0008] In some embodiments of the present disclosure, the power output module further includes a filter unit electrically connected between the rectifier unit and the PWM control unit, and a BUCK power output unit electrically connected between the PWM control unit and an output port of the power output module.

[0009] In some embodiments of the present disclosure, the PWM control unit includes a PWM control chip, the voltage sampling unit is electrically connected to the current detection input pin of the PWM control chip, and the feedback voltage regulation module is electrically connected to the feedback input pin of the PWM control chip.

[0010] In some embodiments of the present disclosure, the voltage sampling unit includes a first resistor and a second resistor electrically connected between the output terminals of the power output module and arranged in series, a transistor whose base is electrically connected between the first resistor and the second resistor, and an emitter of the transistor is correspondingly connected in series with a third resistor and electrically connected to the corresponding output terminal of the power output module, and the feedback voltage stabilizing unit is electrically connected to the collector of the transistor through a resistance ratio voltage divider.

[0011] In some embodiments of the present disclosure, the feedback voltage regulator unit includes a TL431 regulator, the reference end of the TL431 regulator is electrically connected to the voltage sampling unit and the feedback voltage adjustment module, and the cathode of the TL431 regulator is electrically connected to the PWM control unit after voltage division and low-pass filtering.

[0012] In some embodiments of the present disclosure, the feedback voltage adjustment module includes a small current MOS tube and a resistor-capacitor filter unit that are electrically connected in sequence.

[0013] In some embodiments of the present disclosure, the Bluetooth main control module includes a Bluetooth main control chip and a potentiometer adjustment unit electrically connected to a data input pin of the Bluetooth main control chip.

[0014] According to another aspect of the present disclosure, a Bluetooth dimming system is disclosed, including multiple Bluetooth dimmers electrically connected to each light source device to be controlled, a mobile control terminal connected to the Bluetooth dimmer via Bluetooth communication, and a wireless remote control connected to the Bluetooth dimmer via wireless communication.

[0015] In some embodiments of the present disclosure, the Bluetooth main control module of the Bluetooth dimmer includes a Bluetooth main control chip and a remote control receiving unit for receiving a control signal of the wireless remote control, the remote control receiving unit includes a wireless receiving chip, and the output pin of the wireless receiving chip is correspondingly connected to the detection pin of the Bluetooth main control chip.

[0016] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0017] 1. Through the mobile control terminal, the output voltage range of the Bluetooth dimmer can be configured according to different types of LED light strips, thereby realizing remote brightness adjustment of the light source equipment to be controlled; and at the same time, remote adjustment can be performed through a wireless remote control, which is convenient to operate.

[0018] 2. The feedback voltage regulator module samples the output voltage of the power output module and relies on feedback control to deal with output voltage fluctuations, thereby ensuring the stability of the output voltage and solving the flicker fluctuation problem of the light source equipment.

[0019] 3. The Bluetooth main control module adjusts the output voltage through the PWM signal, so as to achieve voltage regulation within the set voltage range by changing the PWM value in the range of 0 to 100%. The adjustment range is wide and the voltage regulation effect is excellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the composition of a Bluetooth dimming system in one embodiment of the present application.

[0021] Figure 2 This is a schematic diagram of the composition principle of a Bluetooth dimmer in one embodiment of the present application.

[0022] Figure 3 1 is a circuit diagram of a power module in one embodiment of the present application.

[0023] Figure 4 1 is a circuit schematic diagram of a power output module and a voltage sampling unit in an embodiment of the present application.

[0024] Figure 5 4 is a circuit diagram of a feedback voltage stabilization module in an embodiment of the present application.

[0025] Figure 6 This is a circuit schematic diagram of a feedback voltage adjustment module and part of a Bluetooth main control module in an embodiment of the present application.

[0026] Figure 7 1 is a circuit diagram of a remote control receiving unit in one embodiment of the present application.

[0027] Figure 8 1 is a circuit schematic diagram of a potentiometer adjustment unit in one embodiment of the present application. DETAILED DESCRIPTION

[0028] The programs involved or relied upon in the following embodiments are all conventional programs or simple programs in the technical field, and those skilled in the art can make conventional choices or adaptive adjustments according to specific application scenarios. The "connection" and "connection" involved in this application, unless otherwise specified, include direct and indirect connections (connections). The components involved in the following embodiments, unless otherwise specified, are all conventional commercially available products.

[0029] In order to better understand the technical solution of the present application, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] This example discloses a Bluetooth dimming system, see Figure 1 , which includes several Bluetooth dimmers, mobile control terminals and / or wireless remote controllers.

[0031] Each Bluetooth dimmer is electrically connected to each light source device to be regulated, and is used to adjust the brightness of the light source of the corresponding light source device. The mobile control terminal initiates a control instruction through Bluetooth wireless communication with the Bluetooth dimmer to perform unified or specified control of multiple Bluetooth dimmers. Specifically, in the present embodiment, the mobile control terminal is a smart phone. By turning on the Bluetooth function of the mobile control terminal and using the corresponding applet or APP to enter the control operation interface of the light source device, the control software will automatically search for nearby Bluetooth dimmers via Bluetooth. After checking the Bluetooth dimmer to be regulated in the software device list area, the brightness of the light source device corresponding to the selected Bluetooth dimmer can be adjusted by dragging the brightness bar on the operation interface.

[0032] In this embodiment, the brightness adjustment function of the light source device can also be realized through the wireless remote control in the Bluetooth dimming system. In this example, a 433M remote control or a 433M wall-mounted wireless remote control is configured. After the address code is configured for the wireless remote control through the mobile control terminal, the control signal can be wirelessly sent to the Bluetooth dimmer through the wireless remote control to realize the brightness and switch control of the light source device.

[0033] In addition, this example also discloses a Bluetooth dimmer, in which the Bluetooth dimmer adjusts the current through the volt-ampere characteristics of the LED to adjust the power, thereby realizing the regulation of the brightness of the light source device. Specifically, after receiving the dimming signal data sent by the mobile control terminal or the wireless remote controller, the Bluetooth dimmer stores the dimming signal data, and outputs PWM to adjust the output voltage according to the PWM parameters corresponding to the dimming signal, thereby realizing the brightness regulation of the light source device.

[0034] Specifically, to realize the control function of the Bluetooth dimmer, see Figure 2 In this embodiment, the Bluetooth dimmer includes a power module, a power output module, a voltage sampling unit, a feedback voltage stabilization module, a Bluetooth main control module, and a feedback voltage adjustment module.

[0035] The power module is used to provide power supply to the power output module, the feedback voltage regulator module, and the control of the Bluetooth main control module. Figure 3 The input of the power module is 220V AC mains. To meet the DC power requirements of the LED light source and Bluetooth dimmer modules, the power module includes a rectifier unit. The rectifier unit rectifies the AC power into DC power through a full-bridge circuit composed of diodes D101, D102, D103, and D104, and outputs the AC power from the P1 port. Considering that the feedback voltage regulator module in this example requires a 15V DC voltage and the Bluetooth main control module requires a 5V DC voltage, a step-down unit is provided after the full-bridge rectifier circuit. In this example, the step-down unit is specifically a voltage conversion chip, which is used to obtain 15V and 5V DC voltages respectively.

[0036] The power output module is used to respond to the corresponding control signal and adjust the brightness of the light source device through different output powers. Figure 4 , the input of the power output module is the P1 port, which is connected to the power module to obtain the corresponding voltage. In this example, a filter unit is provided at the input port of the power output module, and the filter unit specifically includes a capacitor C101. The input voltage is stabilized and filtered by the charge and discharge of the capacitor C101. In order to control the output power, the power output module also includes a PWM control unit. In this example, the PWM control unit adopts a PWM control chip of model OB2263, and uses the PWM signal corresponding to the corresponding control demand output by the Bluetooth main control module as the control reference to control the output power of the power output module, thereby achieving the purpose of brightness control of the light source device. Specifically, the PWM control chip is powered by the 15V DC voltage output by the power module, and the PWM duty cycle of its output is determined by the voltage of the feedback input pin FB and the current detection input pin SENSE; in addition, the output pin GATA of the PWM control chip is connected to the gate of the power MOS tube Q101 through the resistor R102, thereby controlling the conduction degree of the power MOS tube, and using the corresponding duty cycle voltage signal to control the conduction time ratio of the power MOS tube, thereby achieving the adjustment of the output voltage and the brightness adjustment of the light source device. In this example, the current measurement input pin SENSE of the PWM control chip is connected to the source of the power MOS tube Q101, thereby realizing cycle-by-cycle detection and current limiting to protect the power MOS tube Q101 from overcurrent and limit the maximum output power; and the feedback input pin FB takes the output of the feedback voltage regulator module as input, and adjusts the PWM signal according to the feedback voltage and the control signal of the Bluetooth main control module, thereby avoiding voltage fluctuations while accurately responding to the control signal.

[0037] In addition, the power output module also includes a BUCK power output unit for achieving step-down conversion. The specific BUCK power output unit includes a diode D105, an inductor L101 and a capacitor C104. The BUCK power output unit is correspondingly connected to the drain of the power MOS tube Q101. Energy storage and high-frequency signal filtering can be achieved through the inductor L101 and the capacitor C104.

[0038] In order to obtain the voltage fluctuation of the power output module, the Bluetooth dimmer is equipped with a voltage sampling unit. Since the power output is not directly related to GND, the output needs to be processed by proportional inversion to obtain a proportional voltage sampling signal related to GND. For details, see Figure 4 The voltage sampling unit includes a first resistor R106 and a second resistor R105 disposed between the output ports of the power output module, the two resistors are connected in series, and a transistor Q102 is disposed, the base of the transistor Q102 is connected between the first resistor R106 and the second resistor R105, the emitter of the transistor Q102 is connected to the other end of the first resistor R106 through a third resistor R107, and the collector of the transistor Q102 is grounded through a fourth resistor R108; in this example, the resistance values ​​of the first resistor, the third resistor and the fourth resistor are equal to 100K, and the resistance value of the second resistor is 300K, thus, a voltage divider circuit is formed between R106 and R105, and since the emitter resistance of the PNP transistor Q102 is relatively large, the voltage across the first resistor R106 after voltage division is approximately one-fourth of the output voltage U O , and the voltage across the third resistor R107 is close to the voltage across the first resistor R106, so the inverted voltage obtained at the fourth resistor R108 is also close to the divided voltage sampling voltage of the first resistor R106, thereby achieving sampling of the output voltage.

[0039] The feedback voltage stabilization module can output a control signal to the PWM control unit according to the fluctuation of the sampled voltage obtained by the voltage sampling unit, so as to regulate the output of the power output module and realize the feedback stabilization control of the sampled voltage. Figure 5 The feedback voltage regulator module includes a TL431 regulator. The P3 port is connected to the voltage sampling unit, and the P4 port is connected to the feedback voltage adjustment module. The sampling voltage output by the voltage sampling unit is input to the reference end of the TL431 regulator after being divided by resistors R109 and R110 and the feedback voltage adjustment module. When the sampling voltage input to the reference end of the TL431 regulator is higher than the internal reference voltage 2.5V of the TL431 regulator, the output current of the TL431 regulator becomes larger. See Figure 5Since the cathode of the TL431 regulator is connected to the 15V power supply through the resistor R111, when the output current of the TL431 regulator increases, the voltage of the cathode of the TL431 regulator, i.e., pin 1, is pulled down, and then passes through the voltage divider of resistors R112 and R113, and after passing through the composite low-pass filter network composed of resistor R114 and capacitors C105 and C106, it is input to the feedback input pin FB of the PWM control chip through the P2 port, thereby lowering the voltage of the PWM control chip, making the conduction pulse of the power MOS tube Q101 narrower, thereby reducing the output voltage, eliminating the voltage fluctuation at the output end, and realizing the feedback voltage regulation control of the voltage.

[0040] The Bluetooth main control module is used to communicate with the mobile control terminal and to receive control signals from the wireless remote control. Figure 6 The Bluetooth main control module includes a Bluetooth main control chip U202. The Bluetooth main control chip U202 has a built-in memory that can be used to store the brightness adjustment data sent by the mobile control terminal device. In addition, the built-in MCU of the Bluetooth main control chip U202 can decode the remote control signal sent by the wireless remote control according to the set address to achieve wireless remote control adjustment; in addition, the built-in MCU of the Bluetooth main control chip U202 can also calculate the PWM value corresponding to the corresponding brightness of different types of high-voltage LED light strips according to the corresponding relationship between the brightness value and PWM configured by the user, thereby achieving adaptation to different types of high-voltage LED light strips.

[0041] The Bluetooth main control chip outputs the corresponding PWM signal from the PWM pin according to the control signal. To realize the brightness adjustment of the light source device to be adjusted by the PWM signal, see Figure 6The Bluetooth dimmer also includes a feedback voltage adjustment module. Specifically, the feedback voltage adjustment module is connected between the PWM pin of the Bluetooth main control chip and the P4 port of the feedback voltage regulator module. It includes a small current MOS tube Q401 and a resistance-capacitance filter unit composed of resistors R401, R402, R403 and capacitors C401 and C402. The PWM pin of the Bluetooth main control chip outputs a PWM signal corresponding to the required brightness, and the analog adjustable resistance circuit composed of the small current MOS tube and the resistance-capacitance filter unit is used to adjust the sampling voltage ratio, thereby adjusting the output voltage of the power output module to change the brightness of the LED light strip and realize stepless dimming. Specifically, when the PWM signal output by the PWM pin of the Bluetooth main control chip is the minimum value 0, the small current MOS tube Q401 is completely non-conductive, which is equivalent to the analog adjustable resistance circuit being in a high-resistance state, thereby minimizing the degree of shunting the resistor R110 of the feedback voltage regulator module. At this time, the sampled voltage value at the reference end of the TL431 regulator is relatively large, so that after being fed back to the power output module, the output voltage of the power output module is minimized; when the PWM signal output by the PWM pin of the Bluetooth main control chip is the maximum value 100%, the small current MOS tube Q401 is completely conductive, and the resistance of the analog adjustable resistance circuit is equivalent to the sum of the resistance values ​​of the resistors R401, R402, and R403, and is in the lowest resistance state, thereby maximizing the degree of shunting the resistor R110 of the feedback voltage regulator module. At this time, the sampled voltage value at the reference end of the TL431 regulator is relatively small, so that after being fed back to the power output module, the output voltage of the power output module is maximized. Therefore, by adjusting the PWM signal output by the PWM pin of the Bluetooth main control chip within the range of 0 to 100%, voltage regulation can be achieved within the set voltage range, and by configuring the PWM values ​​corresponding to the minimum brightness value and the maximum brightness value, the PWM values ​​corresponding to each intermediate brightness value can be calculated, thereby realizing voltage regulation of different high-voltage LED light strips, thereby achieving the purpose of brightness adjustment.

[0042] The remote control receiving unit is used to receive the control signal of the wireless remote control. Figure 7 In this embodiment, the remote control receiving unit includes a wireless receiving chip SYN590, whose ANT pin is connected to a receiving antenna for receiving the remote control signal of the wireless remote controller, and the output pin DO of the wireless receiving chip is connected to the detection pin PB1 / SCL of the Bluetooth main control chip, thereby outputting the demodulated digital signal to the detection pin of the Bluetooth main control chip for decoding verification. When and only when the signal address is consistent with the configured address, the digital signal is identified as the remote control signal of the local machine and the response brightness adjustment is performed.

[0043] See also Figure 8The Bluetooth main control module also includes a potentiometer adjustment unit electrically connected to the data input pin DM / SDA of the Bluetooth main control chip, through which the manual adjustment of the light source device to be controlled can be realized. The potentiometer adjustment unit specifically includes a sliding rheostat VR201B and a filter capacitor C201. The knob is used to change the contact position of the sliding rheostat to adjust the output signal of the potentiometer adjustment unit P6 port, and then adjust the duty cycle of the PWM signal output by the Bluetooth main control chip, thereby realizing the brightness adjustment of the light source device.

[0044] Although some preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0045] Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A Bluetooth dimmer, characterized in that: It includes a power module provided with a rectifier unit, a power output module electrically connected to the rectifier unit and including a PWM control unit, a voltage sampling unit for sampling the output voltage of the power output module, a feedback voltage stabilizing module electrically connected between the PWM control unit and the voltage sampling unit, a Bluetooth main control module for receiving control signals from a mobile control terminal and a wireless remote controller, and a feedback voltage adjustment module electrically connected between the Bluetooth main control module and the feedback voltage stabilizing module; the PWM control unit includes a PWM control chip, the voltage sampling unit is electrically connected to a current detection input pin of the PWM control chip, and the feedback voltage stabilizing module is electrically connected to a feedback input pin of the PWM control chip.

2. The Bluetooth dimmer according to claim 1, characterized in that: The power module also includes a step-down unit which is electrically connected to the rectifier unit and is used to provide a voltage of a corresponding level to the PWM control unit and the Bluetooth main control module.

3. The Bluetooth dimmer according to claim 1, characterized in that: The power output module further includes a filter unit electrically connected between the rectifying unit and the PWM control unit, and a BUCK power output unit electrically connected between the PWM control unit and an output port of the power output module.

4. The Bluetooth dimmer according to claim 1, characterized in that: The voltage sampling unit includes a first resistor and a second resistor which are electrically connected between the output terminals of the power output module and are arranged in series, a transistor whose base is electrically connected between the first resistor and the second resistor, and an emitter of the transistor is connected in series with a third resistor and is electrically connected to the corresponding output terminal of the power output module. The feedback voltage stabilizing unit is electrically connected to the collector of the transistor through a resistor ratio voltage divider.

5. The Bluetooth dimmer according to claim 1, characterized in that: The feedback voltage stabilizing unit comprises a TL431 regulator, the reference end of the TL431 regulator is electrically connected to the voltage sampling unit and the feedback voltage adjustment module, and the cathode of the TL431 regulator is electrically connected to the PWM control unit after voltage division and low-pass filtering.

6. The Bluetooth dimmer according to claim 1, characterized in that: The feedback voltage adjustment module includes a small current MOS tube and a resistor-capacitor filter unit which are electrically connected in sequence.

7. The Bluetooth dimmer according to claim 1, characterized in that: The Bluetooth main control module comprises a Bluetooth main control chip and a potentiometer adjustment unit electrically connected to a data input pin of the Bluetooth main control chip.

8. A Bluetooth dimming system, characterized in that: It comprises a plurality of Bluetooth dimmers as claimed in claim 1 which are electrically connected to the light source devices to be controlled respectively, a mobile control terminal which is connected to the Bluetooth dimmer via Bluetooth communication, and a wireless remote controller which is connected to the Bluetooth dimmer via wireless communication.

9. The Bluetooth dimming system according to claim 8, characterized in that: The Bluetooth main control module of the Bluetooth dimmer includes a Bluetooth main control chip and a remote control receiving unit for receiving the control signal of the wireless remote control. The remote control receiving unit includes a wireless receiving chip. The output pin of the wireless receiving chip is correspondingly connected to the detection pin of the Bluetooth main control chip.

Images