CN110958730A - Low-cost bluetooth ad hoc network LED drive circuit - Google Patents
Low-cost bluetooth ad hoc network LED drive circuit Download PDFInfo
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- CN110958730A CN110958730A CN201811107908.7A CN201811107908A CN110958730A CN 110958730 A CN110958730 A CN 110958730A CN 201811107908 A CN201811107908 A CN 201811107908A CN 110958730 A CN110958730 A CN 110958730A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses a low-cost Bluetooth ad hoc network LED drive circuit, which comprises an AC/DC constant voltage and constant current conversion circuit, a Bluetooth power supply circuit, a light source drive control circuit, an MLE-Mesh module and a Bluetooth signal processing control module; the AC/DC constant voltage and constant current conversion circuit is connected with the blue power supply circuit and the light source driving control circuit, and the AC/DC constant voltage and constant current conversion circuit and the light source driving control circuit are both connected with the light emitting source; the intelligent mobile phone can be connected with the intelligent sound box through the mobile phone APP, voice control is achieved, the wireless control distance is long, signals are stable, the Bluetooth nodes can be self-organized, any light scene is set, the timing switch and dimming are achieved, the timing scene is turned on and off, voice instructions of multiple languages are received, and the intelligent living needs are met. Each path of the R-G-B-3 output circuit is independently controlled by a constant current circuit, so that the out-of-control caused by signal faults is avoided, and the reliability is high; in addition, the warm light dimming control MOS tube Q8 and the white light dimming control MOS tube Q9 pass through the U1 and the peripheral circuit for constant current, so that the cost is low and the benefit is high.
Description
Technical Field
The invention relates to the technical field of lighting circuits, in particular to a low-cost Bluetooth ad hoc network LED driving circuit.
Background
In daily life, lamps and lanterns such as down lamp, panel light, projecting lamp, ceiling lamp and shot-light all are comparatively common illumination products, however, these illumination product functions are comparatively single. With the rapid development of the internet of things technology, the material culture life needs of people are continuously improved, and the common lighting products in the past can not meet the requirements of pursuing intelligent situation life gradually.
Disclosure of Invention
In view of the above, the present invention is directed to the defects in the prior art, and a main object of the present invention is to provide a low-cost bluetooth ad hoc network LED driving circuit, which can effectively solve the problem that the existing lighting product cannot meet the requirements of pursuing intelligent situation life.
In order to achieve the purpose, the invention adopts the following technical scheme:
a low-cost Bluetooth ad hoc network LED drive circuit comprises an AC/DC constant voltage and constant current conversion circuit, a Bluetooth power supply circuit, a light source drive control circuit, an MLE-Mesh module and a Bluetooth signal processing control module; the AC/DC constant voltage and constant current conversion circuit is connected with a blue power supply circuit and a light source drive control circuit, the AC/DC constant voltage and constant current conversion circuit and the light source drive control circuit are both connected with a light emitting source, the Bluetooth power supply circuit is connected with an MLE-Mesh module, the MLE-Mesh module is connected with a Bluetooth signal processing control module and wirelessly connected with a mobile phone intelligent sound Bluetooth signal emitting module, and the Bluetooth signal processing control module is connected with a light source drive control circuit;
the AC/DC constant voltage and constant current conversion circuit consists of a bridge circuit, an EMC filter circuit, an output constant voltage and constant current control circuit, a secondary arrangement filter circuit and an overshoot prevention clamping circuit;
the Bluetooth power supply circuit consists of a chip U2 and peripheral circuits thereof; the MLE-Mesh module is provided with a Bluetooth module;
the 7 th pin of the socket CON1 of the Bluetooth module outputs an adjustable PWM signal to connect with the MOS tube Q9, the MOS tube Q9, the chip U1 and the surrounding circuits process the signal and connect with the 5 th pin W of the socket CON2 at the output end, and the external warm light LED and the 6 th pin of the socket CON2 share the anode output voltage LED +, so as to form a loop, and the brightness of the external warm light LED can be changed randomly;
the 6 th pin of the socket CON1 of the Bluetooth module outputs an adjustable PWM signal to connect with the MOS tube Q8, the MOS tube Q8, the chip U1 and the peripheral circuits thereof process the signal and connect with the 3 rd pin C-of the socket CON2 at the output end, and the external white light LED is connected with the 6 th pin of the socket CON2 to output the voltage LED + by sharing the anode, so that a loop is formed, and the brightness of the external white light LED can be changed randomly;
the 5 th pin of the socket CON1 of the Bluetooth module outputs an adjustable PWM signal to be connected with triodes Q4 and Q7, the triodes Q4 and Q7 and the peripheral circuits thereof process the signal and are connected with the 2 nd pin B-of the socket CON2 at the output end, and the external blue light LED is connected with the 6 th pin of the socket CON2 to output a voltage LED + by common anode to form a loop, so that the brightness of the external blue light source can be changed randomly;
the 4 th pin of the socket CON1 of the Bluetooth module outputs an adjustable PWM signal to be connected with triodes Q3 and Q6, the triodes Q3 and Q6 and the peripheral circuits thereof process the signal and are connected with the 4 th pin G-of the socket CON2 at the output end, and a green light LED is externally connected to the 6 th pin of the socket CON2 to output a voltage LED + which is a common anode, so that a loop is formed, and the brightness of the externally connected green light LED is changed randomly;
the 3 rd pin of the socket CON1 of the Bluetooth module outputs an adjustable PWM signal to connect the triodes Q2 and Q5, the triodes Q2 and Q5 and the peripheral circuits thereof process the signal and connect the 1 st pin R-of the socket CON2 at the output end, and the external red light LED is connected to the 6 th pin of the socket CON2 to output the voltage LED + by common anode, so that a loop is formed, and the brightness of the external red light LED can be changed randomly.
Preferably, the bridge circuit is a bridge BD 1.
Preferably, the EMC filter circuit is composed of an inductor L1, a resistor R1, a capacitor C1 and a capacitor C2.
Preferably, the output constant voltage and constant current control circuit is composed of a chip U1, a resistor R9, a resistor R10, a resistor R11, a resistor R6 and a resistor R7.
Preferably, the secondary tidying and filtering circuit is composed of a diode D2, a capacitor C5, a capacitor C6 and a resistor R31.
Preferably, the overshoot protection clamp circuit is a voltage regulator ZD 1.
Preferably, the light source driving control circuit comprises two dimming driving enhancement circuits, wherein one dimming driving enhancement circuit comprises a transistor Q12, a transistor Q16, a transistor Q10, a transistor Q14, a transistor Q9 and peripheral circuits thereof, and the other dimming driving enhancement circuit comprises a transistor Q13, a transistor Q17, a transistor Q15, a transistor Q11, a transistor Q8 and peripheral circuits thereof.
Preferably, the bluetooth module drives the trigger digital signal to convert the digital signal into an analog signal without dimming stroboflash through a digital-to-analog conversion circuit, and the digital-to-analog conversion circuit is connected with the light source driving control circuit.
Preferably, the digital-to-analog conversion circuit is composed of a resistor R36, a capacitor C1, a DA converter U3 and a resistor R37.
Compared with the prior art, the invention has obvious advantages and beneficial effects, and specifically, the technical scheme includes that:
the intelligent mobile phone can be connected with the intelligent sound box through the mobile phone APP, voice control is achieved, the wireless control distance is long, signals are stable, the Bluetooth nodes can be self-organized, any light scene is set, the timing switch and dimming are achieved, the timing scene is turned on and off, voice instructions of multiple languages are received, and the intelligent living needs are met. Each path of the R-G-B-3 output circuit is independently controlled by a constant current circuit, so that the out-of-control caused by signal faults is avoided, and the reliability is high; in addition, the warm light dimming control MOS tube Q8 and the white light dimming control MOS tube Q9 pass through the U1 and the peripheral circuit for constant current, so that the cost is low and the benefit is high.
To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic block diagram of a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the AC/DC constant voltage and constant current converting circuit according to the present invention;
FIG. 3 is a schematic diagram of a specific circuit structure of a Bluetooth power supply circuit according to a preferred embodiment of the present invention;
figure 4 is a schematic diagram of the specific circuit structure of the BLE-Mesh module and the bluetooth signal processing module in the preferred embodiment of the present invention;
FIG. 5 is a schematic diagram of a specific circuit structure of a light source driving control circuit according to a preferred embodiment of the present invention;
FIG. 6 is a schematic diagram of a specific circuit structure of the digital-to-analog conversion circuit according to the preferred embodiment of the present invention.
Detailed Description
Referring to fig. 1 to 6, a specific structure of a preferred embodiment of the invention is shown, which includes an AC/DC constant voltage and constant current converting circuit, a bluetooth power supply circuit, a light source driving control circuit, an MLE-Mesh module, and a bluetooth signal processing control module.
The AC/DC constant voltage and constant current conversion circuit is connected with the blue power supply circuit and the light source driving control circuit, the AC/DC constant voltage and constant current conversion circuit and the light source driving control circuit are both connected with the light emitting source, the Bluetooth power supply circuit is connected with the MLE-Mesh module, the MLE-Mesh module is connected with the Bluetooth signal processing control module and is in wireless connection with the mobile phone intelligent sound Bluetooth signal emitting module, and the Bluetooth signal processing control module is connected with the light source driving control circuit.
As shown in fig. 2, the AC/DC constant voltage and constant current conversion circuit is composed of a bridge circuit, an EMC filter circuit, an output constant voltage and constant current control circuit, a secondary trimming filter circuit, and an overshoot prevention clamp circuit. The bridge circuit is a vertebra BD 1; the EMC filter circuit consists of an inductor L1, a resistor R1, a capacitor C1 and a capacitor C2; the output constant voltage and constant current control circuit consists of a chip U1, a resistor R9, a resistor R10, a resistor R11, a resistor R6 and a resistor R7; the secondary tidying and filtering circuit consists of a diode D2, a capacitor C5, a capacitor C6 and a resistor R31; the overshoot protection clamp circuit is a voltage regulator tube ZD 1.
As shown in fig. 3, the bluetooth power supply circuit is composed of a chip U2 and its peripheral circuits; the MLE-Mesh module is provided with a Bluetooth module, and the driving trigger signal is not limited to a wireless signal of the Bluetooth module and also comprises at least one of a WiFi (wireless fidelity), a Zigbee touch module and an entity key.
The 7 th pin of the socket CON1 of the bluetooth module outputs an adjustable PWM signal to connect the MOS transistor Q9, the MOS transistor Q9, the chip U1 and the peripheral circuits thereof process the signal and connect the 5 th pin W of the socket CON2 at the output end, and the external warm light LED is connected to the 6 th pin of the socket CON2 to output the voltage LED +, which is the common anode, to form a loop, so that the brightness of the external warm light LED can be changed arbitrarily.
The 6 th pin of the socket CON1 of the bluetooth module outputs an adjustable PWM signal to connect the MOS transistor Q8, the MOS transistor Q8, the chip U1 and the peripheral circuits thereof connect the output end of the processing of the signal to the socket CON2, the 3 rd pin C-, and the external white light LED is connected to the 6 th pin of the socket CON2 to output the voltage LED + as the common anode, so as to form a loop, and the brightness of the external white light LED can be changed arbitrarily.
The 5 th pin of the socket CON1 of the Bluetooth module outputs an adjustable PWM signal to connect the triodes Q4 and Q7, the triodes Q4 and Q7 and the peripheral circuits thereof process the signal and connect the 2 nd pin B-of the socket CON2 of the output end, and the external blue light LED is connected to the 6 th pin of the socket CON2 to output the voltage LED + in a common anode way, so that a loop is formed, and the brightness of the external blue light source can be changed randomly.
The 4 th pin of the socket CON1 of the Bluetooth module outputs an adjustable PWM signal to connect the triodes Q3 and Q6, the triodes Q3 and Q6 and the peripheral circuits thereof process the signal and connect the 4 th pin G-of the socket CON2 at the output end, and the external green light LED is connected to the 6 th pin of the socket CON2 to output the voltage LED + by common anode, so that a loop is formed, and the brightness of the external green light LED is changed randomly.
The 3 rd pin of the socket CON1 of the Bluetooth module outputs an adjustable PWM signal to connect the triodes Q2 and Q5, the triodes Q2 and Q5 and the peripheral circuits thereof process the signal and connect the 1 st pin R-of the socket CON2 at the output end, and the external red light LED is connected to the 6 th pin of the socket CON2 to output the voltage LED + by common anode, so that a loop is formed, and the brightness of the external red light LED can be changed randomly.
As shown in fig. 5, the light source driving control circuit includes two dimming driving enhancement circuits, one of which is composed of transistors Q12, Q16, Q10, Q14, and MOS transistor Q9 and its peripheral circuit, and the other of which is composed of transistors Q13, Q17, Q15, Q11, and MOS transistor Q8 and its peripheral circuit.
In addition, the Bluetooth module drives the trigger digital signal to convert the digital signal into an analog signal without dimming stroboflash through a digital-to-analog conversion circuit, and the digital-to-analog conversion circuit is connected with the light source driving control circuit. As shown in fig. 6, the digital-to-analog conversion circuit is composed of a resistor R36, a capacitor C1, a DA converter U3, and a resistor R37. The digital-to-analog conversion circuit converts the digital signal into an analog signal, provides the analog signal for the light source driving control circuit and removes the stroboscopic of digital signal dimming. The single circuit can remove dimming stroboflash of single-path driving, and can also add a plurality of circuits to remove dimming stroboflash of a plurality of driving circuits.
Detailed description the working principle of the present embodiment is as follows:
after the alternating current AC voltage is input, the alternating current AC voltage is converted into constant output voltage through an AC/DC constant voltage and constant current conversion circuit; the constant output voltage is converted into 3.3V voltage through a Bluetooth power supply circuit, and the voltage is provided for the BLE-Mesh module; the AC/DC constant voltage and constant current conversion circuit provides a common anode constant voltage for the luminous source and the light source driving control circuit; the BLE-Mesh module identifies and processes signals of the Bluetooth signal transmitting module of the mobile phone intelligent sound equipment and provides control commands for the Bluetooth signal processing control module; the Bluetooth signal processing control module provides a driving signal for the light source driving control circuit to control the color temperature brightness and color change of the light emitting source.
The invention can realize the following functions:
1. the LED lamp comprises red light R-interface constant current control circuit triodes Q2 and Q3 and surrounding elements thereof, green light R-interface constant current control circuit triodes Q4 and Q5 and surrounding elements thereof, and blue light B-interface constant current control circuit triodes Q6 and Q7 and surrounding elements thereof; the scheme is simple and practical, and the cost is low. The maximum current of the warm light W-dimming control MOS tube Q8 and the maximum current of the white light C-dimming control MOS tube Q9, the chip U1, the triode Q1, the resistor R8, the resistor R9, the resistor R10 and surrounding components control the MOS tube Q8 and the MOS tube Q9 to be constant.
2. Soft start function: when the pin signal of socket CON1 of bluetooth module is opened and is shut off, the PWM signal pulse width is opened gradually and is shut off, and every pin makes the light source softly open and shut off through respective signal processing circuit control again, protects LED lamp pearl, extension light source life-span.
3, in the process of maximum adjustment of the PWM pulse width, pins 6 and 7 of a socket CON1 of the Bluetooth module transmit and connect a driving circuit by a PWM pulse width automatic adjustment signal, and the maximum total power is kept constant; when the pulse width of the 6-pin PWM of the socket CON1 pin of the Bluetooth module is maximum, and the pulse width of the 7-pin PWM is adjusted to gradually change from minimum to maximum, the pulse width of the 6-pin PWM is automatically adjusted from large to small, the power is maintained constant, and the overload phenomenon cannot occur.
4. When the bluetooth module successfully matches the code, the 4 th pin of the socket CON1 of the bluetooth module triggers a pulse to the connected driving circuit, so that the light source connected to the 3 rd pin of the socket CON2 and the 1 st pin of the common anode flickers once.
5. The pins 6 and 7 of the socket CON1 of the bluetooth module are connected with the MOS transistors Q8 and Q9, when the white light of the pin 5 and the warm light of the pin 6 of the socket CON2 are connected to be turned on, the pins 3, 4 and 5 of the socket CON1 and the connection circuit are turned on, and the light source for RGB red, green and blue output by the pins 2, 3 and 4 of the socket CON2 is turned off. The socket CON 13 rd, 4 th, 5 th pins and the connecting circuit of the Bluetooth module, when the socket CON2 2 nd, 3 th, 4 th output RGB red green blue light source is turned on, MOS tubes Q8, Q9 connected to the 6 th pin and 7 th pin of the socket CON1 of the Bluetooth module, and the connecting socket CON2 5 th pin white light and 6 th pin warm light are turned off.
The socket CON1 of the bluetooth module 6 can set the output duty ratio at regular time according to the PWM pulse widths of the 3 rd, 4 th, 5 th, 6 th and 7 th PWM pulse widths, and set the brightness, color temperature and lighting scenes of various scenes of the light source at different time periods at regular time by the light source driving circuit, and set the on and off of the light source at regular time.
7. The BLE-Mesh module receives the music signal transmitted by the Bluetooth signal transmitting module, is connected with the Bluetooth signal processing control module, and controls the light source to flash the music signal synchronously through the light source driving control circuit.
8. The chip U2 and surrounding elements and voltage settings thereof reduce the standby power consumption of the Bluetooth module and reduce the energy consumption.
The design key points of the invention are as follows: the intelligent mobile phone can be connected with the intelligent sound box through the mobile phone APP, voice control is achieved, the wireless control distance is long, signals are stable, the Bluetooth nodes can be self-organized, any light scene is set, the timing switch and dimming are achieved, the timing scene is turned on and off, voice instructions of multiple languages are received, and the intelligent living needs are met. Each path of the R-G-B-3 output circuit is independently controlled by a constant current circuit, so that the out-of-control caused by signal faults is avoided, and the reliability is high; in addition, the warm light dimming control MOS tube Q8 and the white light dimming control MOS tube Q9 pass through the U1 and the peripheral circuit for constant current, so that the cost is low and the benefit is high.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (9)
1. The utility model provides a low-cost bluetooth ad hoc network LED drive circuit which characterized in that: the system comprises an AC/DC constant voltage and constant current conversion circuit, a Bluetooth power supply circuit, a light source driving control circuit, an MLE-Mesh module and a Bluetooth signal processing control module; the AC/DC constant voltage and constant current conversion circuit is connected with a blue power supply circuit and a light source drive control circuit, the AC/DC constant voltage and constant current conversion circuit and the light source drive control circuit are both connected with a light emitting source, the Bluetooth power supply circuit is connected with an MLE-Mesh module, the MLE-Mesh module is connected with a Bluetooth signal processing control module and wirelessly connected with a mobile phone intelligent sound Bluetooth signal emitting module, and the Bluetooth signal processing control module is connected with a light source drive control circuit;
the AC/DC constant voltage and constant current conversion circuit consists of a bridge circuit, an EMC filter circuit, an output constant voltage and constant current control circuit, a secondary arrangement filter circuit and an overshoot prevention clamping circuit;
the Bluetooth power supply circuit consists of a chip U2 and peripheral circuits thereof; the MLE-Mesh module is provided with a Bluetooth module;
the 7 th pin of the socket CON1 of the Bluetooth module outputs an adjustable PWM signal to connect with the MOS tube Q9, the MOS tube Q9, the chip U1 and the surrounding circuits process the signal and connect with the 5 th pin W of the socket CON2 at the output end, and the external warm light LED and the 6 th pin of the socket CON2 share the anode output voltage LED +, so as to form a loop, and the brightness of the external warm light LED can be changed randomly;
the 6 th pin of the socket CON1 of the Bluetooth module outputs an adjustable PWM signal to connect with the MOS tube Q8, the MOS tube Q8, the chip U1 and the peripheral circuits thereof process the signal and connect with the 3 rd pin C-of the socket CON2 at the output end, and the external white light LED is connected with the 6 th pin of the socket CON2 to output the voltage LED + by sharing the anode, so that a loop is formed, and the brightness of the external white light LED can be changed randomly;
the 5 th pin of the socket CON1 of the Bluetooth module outputs an adjustable PWM signal to be connected with triodes Q4 and Q7, the triodes Q4 and Q7 and the peripheral circuits thereof process the signal and are connected with the 2 nd pin B-of the socket CON2 at the output end, and the external blue light LED is connected with the 6 th pin of the socket CON2 to output a voltage LED + by common anode to form a loop, so that the brightness of the external blue light source can be changed randomly;
the 4 th pin of the socket CON1 of the Bluetooth module outputs an adjustable PWM signal to be connected with triodes Q3 and Q6, the triodes Q3 and Q6 and the peripheral circuits thereof process the signal and are connected with the 4 th pin G-of the socket CON2 at the output end, and a green light LED is externally connected to the 6 th pin of the socket CON2 to output a voltage LED + which is a common anode, so that a loop is formed, and the brightness of the externally connected green light LED is changed randomly;
the 3 rd pin of the socket CON1 of the Bluetooth module outputs an adjustable PWM signal to connect the triodes Q2 and Q5, the triodes Q2 and Q5 and the peripheral circuits thereof process the signal and connect the 1 st pin R-of the socket CON2 at the output end, and the external red light LED is connected to the 6 th pin of the socket CON2 to output the voltage LED + by common anode, so that a loop is formed, and the brightness of the external red light LED can be changed randomly.
2. The low-cost bluetooth ad hoc network LED driving circuit according to claim 1, wherein: the bridge circuit is a bridge BD 1.
3. The low-cost bluetooth ad hoc network LED driving circuit according to claim 1, wherein: the EMC filter circuit is composed of an inductor L1, a resistor R1, a capacitor C1 and a capacitor C2.
4. The low-cost bluetooth ad hoc network LED driving circuit according to claim 1, wherein: the output constant voltage and constant current control circuit is composed of a chip U1, a resistor R9, a resistor R10, a resistor R11, a resistor R6 and a resistor R7.
5. The low-cost bluetooth ad hoc network LED driving circuit according to claim 1, wherein: the secondary tidying and filtering circuit is composed of a diode D2, a capacitor C5, a capacitor C6 and a resistor R31.
6. The low-cost bluetooth ad hoc network LED driving circuit according to claim 1, wherein: the overshoot protection clamp circuit is a voltage regulator tube ZD 1.
7. The low-cost bluetooth ad hoc network LED driving circuit according to claim 1, wherein: the light source driving control circuit comprises two dimming driving enhancement circuits, wherein one dimming driving enhancement circuit comprises triodes Q12, Q16, Q10 and Q14, a MOS transistor Q9 and peripheral circuits thereof, and the other dimming driving enhancement circuit comprises triodes Q13, Q17, Q15 and Q11, a MOS transistor Q8 and peripheral circuits thereof.
8. The low-cost bluetooth ad hoc network LED driving circuit according to claim 1, wherein: the Bluetooth module drives the trigger digital signal to convert the digital signal into an analog signal without dimming stroboflash through a digital-to-analog conversion circuit, and the digital-to-analog conversion circuit is connected with the light source driving control circuit.
9. The low-cost bluetooth ad hoc network LED driving circuit according to claim 8, wherein: the digital-to-analog conversion circuit is composed of a resistor R36, a capacitor C1, a DA converter U3 and a resistor R37.
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| CN201811107908.7A CN110958730A (en) | 2018-09-21 | 2018-09-21 | Low-cost bluetooth ad hoc network LED drive circuit |
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| CN201811107908.7A CN110958730A (en) | 2018-09-21 | 2018-09-21 | Low-cost bluetooth ad hoc network LED drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112437516A (en) * | 2020-12-08 | 2021-03-02 | 宁波恒达高智能科技股份有限公司 | Digital timing dimmer control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112437516A (en) * | 2020-12-08 | 2021-03-02 | 宁波恒达高智能科技股份有限公司 | Digital timing dimmer control circuit |
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