CN113194588A - Dimming circuit based on NFC and PCB thereof - Google Patents
Dimming circuit based on NFC and PCB thereof Download PDFInfo
- Publication number
- CN113194588A CN113194588A CN202110350090.7A CN202110350090A CN113194588A CN 113194588 A CN113194588 A CN 113194588A CN 202110350090 A CN202110350090 A CN 202110350090A CN 113194588 A CN113194588 A CN 113194588A
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- circuit
- nfc
- electrically connected
- control chip
- control circuit
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/175—Controlling the light source by remote control
- H05B47/19—Controlling the light source by remote control via wireless transmission
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a dimming circuit based on NFC and a PCB thereof, comprising a main control circuit, an NFC control circuit, a filter rectification circuit, a secondary filter circuit and a ripple suppression circuit, wherein the main control circuit is respectively electrically connected with a rectifier filter circuit, the secondary rectification circuit and the NFC control circuit; through NFC control circuit and outside NFC inductor wireless communication to feedback control master control circuit adjusts output current, makes output current can carry out the regulation of arbitrary value, and the user only needs to be close to NFC control circuit with the NFC inductor that carries the current control procedure and can adjust.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a dimming circuit based on NFC and a PCB thereof.
Background
The current of the existing power supply is generally regulated by a dial switch, an external plug resistor or wireless control, while the dial switch and the external plug resistor can only be regulated in a fixed value mode and cannot meet the requirement of stepless regulation, while the wireless control can meet the requirement of stepless regulation, but the use condition of the wireless control is limited, the cost is extremely high, for example, a gateway needs to be configured, and a wireless transmission signal can be normally used only by ensuring the normal state.
It is seen that improvements and enhancements to the prior art are needed.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide an NFC-based dimming circuit that inductively adjusts current through NFC, simplifies the adjustment process, and is convenient to use.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a dimmer circuit based on NFC, includes master control circuit, NFC control circuit, filter rectifier circuit, secondary filter circuit and suppression ripple circuit, master control circuit respectively with rectification filter circuit secondary rectifier circuit with NFC control circuit electric connection, suppression ripple circuit with secondary rectifier circuit electric connection, master control circuit is used for controlling output current and output voltage, NFC control circuit is used for receiving the signal of outside NFC inductor and to master control circuit sends control signal, filter rectifier circuit is used for input power source rectification filtering, secondary filter circuit is used for output power source rectification filtering, suppression ripple circuit is used for absorbing the ripple current of output power source.
In the NFC-based dimming circuit, the master control circuit includes a first control chip U1 and a receiving portion, the NFC control circuit includes a second control chip U2 and a transmitting portion, pin 4 of the first control chip U1 and the receiving portion are electrically connected, pin 1 of the second control chip U2 and the transmitting portion are electrically connected, and the receiving portion and the transmitting portion are electrically connected.
In the NFC-based dimming circuit, the NFC control circuit further includes an NFC receiving unit, and the NFC receiving unit is electrically connected to the pin 4 and the pin 5 of the second control chip U2, respectively.
In the NFC-based dimming circuit, the NFC control circuit further includes a third control chip U3, pins 1 and 3 of the third control chip U3 are electrically connected to the transmitter, respectively, and pin 5 of the third control chip U3 is electrically connected to pin 3 of the second control chip U2; the third control chip U3 is used for supplying power to the second control chip U2.
In the NFC-based dimming circuit, the main control circuit includes a primary winding of a transformer T1, an auxiliary winding T2, a rectifying portion, a first energy storage portion, a voltage stabilizing unit, a second energy storage portion, and a first field effect transistor Q1, one end of the primary winding of the transformer T1 is electrically connected to the filter and rectifier circuit, the other end of the primary winding of the transformer T1 is electrically connected to a drain of the first field effect transistor Q1, a gate of the first field effect transistor Q1 is electrically connected to a pin 7 of the first control chip U1, a source of the first field effect transistor Q1 is electrically connected to a pin 6 of the first control chip, one end of the auxiliary winding T2 is electrically connected to one end of the rectifying portion, and the other end of the rectifying portion is electrically connected to one end of the first energy storage portion, one end of the voltage stabilizing unit, one end of the second energy storage portion, and a pin 8 of the first control chip U1, the other end of the auxiliary winding T2, the other end of the first energy storage part, the other end of the voltage stabilizing unit and the other end of the second energy storage part are grounded.
In the NFC-based dimming circuit, the secondary filter circuit includes a secondary winding of a transformer T1, a fourth diode D4, a fifth diode D5, and a fifth capacitor C5, one end of the secondary winding of the transformer T1 is electrically connected to the anode of the fourth diode D4 and the anode of the fifth diode D5, the cathode of the fourth diode D4 and the cathode of the fifth diode D5 are electrically connected to one end of the fifth capacitor C5, and the other end of the fifth capacitor C5 is grounded to the other end of the secondary winding of the transformer T1.
In the NFC-based dimming circuit, the ripple suppression circuit comprises a plurality of ripple absorption parts which are connected in parallel; the plurality of ripple absorbing parts are respectively electrically connected with the anode of the fourth diode D4 and the anode of the fifth diode D5.
In the NFC-based dimming circuit, the filtering and rectifying circuit comprises an EMI filtering unit and a rectifying unit, and the EMI filtering unit is electrically connected with the rectifying unit; the EMI filtering unit is electrically connected with an external power supply, and the rectifying unit is electrically connected with the main control circuit.
The application also provides a PCB board printed with the NFC-based dimming circuit.
Has the advantages that:
the invention provides an NFC-based dimming circuit, which is in wireless communication with an external NFC inductor through an NFC control circuit and controls a main control circuit to adjust output current according to control information feedback, so that the output current can be adjusted at any value, and when a user needs to adjust the output current, the NFC inductor carrying a current control program is only required to be close to the NFC control circuit to be adjusted, so that the whole adjusting process is simplified, and the NFC-based dimming circuit is more convenient to use.
Drawings
Fig. 1 is a circuit diagram of an NFC-based dimming circuit according to the present invention;
fig. 2 is a circuit structure diagram of the main control circuit in the NFC-based dimming circuit according to the present invention;
fig. 3 is a circuit diagram of the NFC control circuit in the NFC-based dimming circuit according to the present invention;
fig. 4 is a circuit structure diagram of the rectifying and filtering circuit in the NFC-based dimming circuit according to the present invention;
fig. 5 is a circuit structure diagram of the secondary rectifier circuit in the NFC-based dimming circuit according to the present invention;
fig. 6 is a circuit structure diagram of the ripple suppression circuit in the NFC-based dimming circuit according to the present invention;
fig. 7 is a block diagram of a circuit structure of the NFC-based dimming circuit according to the present invention.
Detailed Description
The invention provides a dimming circuit based on NFC and a PCB thereof, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail below by referring to the attached drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit indication of the number of technical features indicated.
Referring to fig. 1 to 7, the present invention provides a dimming circuit based on NFC, which includes a main control circuit, an NFC control circuit, a filter and rectifier circuit, a secondary filter circuit, and a ripple suppression circuit, where the main control circuit is electrically connected to the rectifier and filter circuit, the secondary rectifier circuit, and the NFC control circuit, the ripple suppression circuit is electrically connected to the secondary rectifier circuit, the main control circuit is configured to control an output current and an output voltage, the NFC control circuit is configured to receive a signal from an external NFC sensor and send a control signal to the main control circuit, the filter and rectifier circuit is configured to rectify and filter an input power supply, the secondary filter circuit is configured to rectify and filter an output power supply, and the ripple suppression circuit is configured to absorb a ripple current of the output power supply.
The working principle of the application is as follows: when the NFC control circuit senses an external NFC inductor carrying a current control program, the NFC control circuit is started, receives a control signal sent by the external NFC inductor, converts the control signal into a PWM signal, and then sends the PWM signal to the main control circuit, and the main control circuit adjusts output current according to the PWM signal, so that adjustment of the output current is achieved; carry out the regulation of arbitrary value to output current through NFC to when user of service need adjust output current, only need to carry on the NFC inductor that carries current control procedure and be close to NFC control circuit and can adjust, simplified whole accommodation process, it is more convenient to use.
As shown in fig. 1 to 3, further, the master control circuit includes a first control chip U1 and a receiving portion, the NFC control circuit includes a second control chip U2 and a transmitting portion, a pin 4 of the first control chip U1 is electrically connected to the receiving portion, a pin 1 of the second control chip U2 is electrically connected to the transmitting portion, and the receiving portion is electrically connected to the transmitting portion; when the controller is used, the PWM signal generated by the second control chip U2 is transmitted to the transmitter through the pin 1, the transmitter transmits the PWM signal to the receiver, the receiver receives the PWM signal and transmits the PWM signal to the pin 4 of the first control chip U1, and the first control chip U1 adjusts the output current according to the PWM signal.
In this embodiment, the first control chip U1 is a power management chip with a model number RT7331, and the second control chip U2 is an NFC wireless configuration chip with a model number NML 0011.
In one embodiment, the receiving part may be a female seat NU1, the transmitting part may be a male seat NU2, the first control chip U1 and the second control chip U2 are detachably connected through the female seat NU1 and the male seat NU2, and when the order requires that dimming is not needed, the NFC control circuit may be detached, so as to reduce production cost.
As shown in fig. 3, the NFC control circuit further includes an NFC receiving unit, and the NFC receiving unit is electrically connected to the pin 4 and the pin 5 of the second control chip U2, respectively; sensing and receiving a control signal sent by an external NFC sensor through the NFC receiving unit; in this embodiment, an eighteenth capacitor C18 is connected in parallel between the pin 4 and the pin 5 of the second control chip U2, and the eighteenth capacitor C18 is used to filter the received control signal.
As shown in fig. 1 and 3, the NFC control circuit further includes a third control chip U3, wherein pins 1 and 3 of the third control chip U3 are electrically connected to the transmitter, respectively, and pin 5 of the third control chip U3 is electrically connected to pin 3 of the second control chip U2; the third control chip U3 is used for supplying power to the second control chip U2; the third control chip U3 is used for stabilizing the voltage of the power supply of the main control circuit and supplying power to the second control chip U2; in this embodiment, the voltage input to the third control chip U3 is an 18V power supply.
In this embodiment, the third control chip U3 is a voltage regulator chip with model No. DIO 7708.
In this embodiment, the NFC control circuit further includes a fifteenth capacitor C15, a sixteenth capacitor C16 and a seventeenth capacitor C17, one end of the fifteenth capacitor C15 is electrically connected to the pin 1 of the third control chip U3, one ends of the sixteenth capacitor C16 and the seventeenth capacitor C17 are respectively connected to the pin 5 of the third control chip U3 and the pin 3 of the second control chip, and the other end of the fifteenth capacitor C15, the other end of the sixteenth capacitor C16, the other end of the seventeenth capacitor C17, the pin 2 of the third control chip U3 and the pin 2 of the second control chip are grounded; the fifteenth capacitor C15 is used for filtering the input voltage, and the sixteenth capacitor C16 and the seventeenth capacitor C17 are used for filtering the output voltage, so that the second control chip U2 can stably work.
As shown in fig. 1, further, the main control circuit includes a primary winding of a transformer T1, an auxiliary winding T2, a rectifying portion, a first energy storage portion, a voltage stabilizing unit, a second energy storage portion, and a first fet Q1, one end of the primary winding of the transformer T1 is electrically connected to the smoothing and rectifying circuit, the other end of the primary winding of the transformer T1 is electrically connected to a drain of the first fet Q1, a gate of the first fet Q1 is electrically connected to a pin 7 of the first control chip U1, a source of the first fet Q1 is electrically connected to a pin 6 of the first control chip, one end of the auxiliary winding T2 is electrically connected to one end of the rectifying portion, and the other end of the rectifying portion is electrically connected to one end of the first energy storage portion, one end of the voltage stabilizing unit, one end of the second energy storage portion, and a pin 8 of the first control chip U1, the other end of the auxiliary winding T2, the other end of the first energy storage part, the other end of the voltage stabilizing unit and the other end of the second energy storage part are grounded; the working principle is as follows: the primary winding of the transformer T1 receives the input voltage of the filter rectification circuit and feeds the input voltage back to the auxiliary winding T2, the rectification part rectifies the feedback voltage, the rectified feedback voltage is stored in the first energy storage part, then the voltage stabilization processing is carried out on the feedback voltage in the first energy storage part through the voltage stabilization unit and the feedback voltage is output to the second energy storage unit for storage, the feedback voltage in the second energy storage unit is supplied to a pin 8 of the first control chip U1 to supply power to the first control chip U1, and the first control chip U1 can be guaranteed to work stably; in addition, the first control chip U1 controls the control voltage of the gate of the first fet Q1 through the pin 7, so as to control the magnitude of the output current conducted by the first fet Q1, thereby achieving the effect of regulating the current.
In the present embodiment, the rectifying unit includes a third diode D3, and the third diode D3 rectifies the feedback voltage of the auxiliary winding T2.
In this embodiment, the first energy storage unit includes a nineteenth capacitor C19, and the feedback voltage is filtered and stored by the nineteenth capacitor C19.
In this embodiment, the voltage stabilizing unit includes a seventeenth resistor R17, a second triode Q2 and a first voltage regulator ZD1, one end of the seventeenth resistor R17 and a collector of the second triode Q2 are respectively electrically connected to a negative electrode of the third diode D3, the other end of the seventeenth resistor R17 is respectively electrically connected to a base of the second triode Q2 and a negative electrode of the first voltage regulator ZD1, an anode of the first voltage regulator ZD1 is grounded, and an emitter of the second triode Q2 is connected to the pin 8 of the first control chip U1; the seventeenth resistor R17, the second triode Q2 and the first voltage regulator tube ZD1 form a linear voltage regulator circuit, and the feedback voltage is regulated by the linear voltage regulator circuit.
In this embodiment, the second energy storage unit includes a ninth capacitor C9, and the ninth capacitor C9 filters and stores the feedback voltage and supplies power to the pin 8 of the first control chip U1.
As shown in fig. 1, 2, and 3, the secondary filter circuit further includes a secondary winding of a transformer T1, a fourth diode D4, a fifth diode D5, and a fifth capacitor C5, wherein one end of the secondary winding of the transformer T1 is electrically connected to the anode of the fourth diode D4 and the anode of the fifth diode D5, the cathode of the fourth diode D4 and the cathode of the fifth diode D5 are electrically connected to one end of the fifth capacitor C5, and the other end of the fifth capacitor C5 is grounded to the other end of the secondary winding of the transformer T1; the input voltage of the secondary winding of the transformer T1 is rectified by the fourth diode D4 and the fifth diode D5, and the rectified voltage is stored in the fifth capacitor C5.
As shown in fig. 1 and fig. 3, further, the ripple suppression circuit includes a plurality of ripple absorption portions, and the ripple absorption portions are connected in parallel; the plurality of ripple absorbing parts are respectively electrically connected with the anode of the fourth diode D4 and the anode of the fifth diode D5; ripple current rectified by the secondary filter circuit is absorbed by the plurality of ripple absorption parts, so that the output current is more stable.
In the present embodiment, the ripple absorbing unit is a fet, the ripple suppression circuit includes a third fet Q3, a fourth fet Q4, a fifth fet Q5, a sixth fet Q6, a seventh fet Q7, and an eighth fet Q8, and the third fet Q3, the fourth fet Q4, the fifth fet Q5, the sixth fet Q6, the seventh fet Q7, and the eighth fet Q8 are connected in parallel; when the voltage in the fifth capacitor C5 reaches the turn-on voltage of the fets, the drain currents of all the fets will become large, but since the output current is constant, all the fets will absorb the extra ripple current to ensure that the output current is more stable to supply power to the external device.
As shown in fig. 1 and 4, further, the filtering and rectifying circuit includes an EMI filtering unit and a rectifying unit, and the EMI filtering unit is electrically connected to the rectifying unit; the EMI filtering unit is electrically connected with an external power supply, and the rectifying unit is electrically connected with the main control circuit; EMI interference of an external input power supply is filtered through the EMI filtering unit, and input alternating-current voltage is converted into direct-current voltage through the rectifying unit so as to supply power to a subsequent circuit to work.
The application also provides a switching power supply PCB board, it has above to print the dimming circuit based on NFC.
In conclusion, the NFC control circuit is in wireless communication with the external NFC inductor, the main control circuit is controlled to regulate the output current according to the control information feedback, the output current can be regulated at any value, and when a user needs to regulate the output current, the NFC inductor carrying a current control program is only required to be close to the NFC control circuit to be regulated, so that the whole regulation process is simplified, and the use is more convenient.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (9)
1. The utility model provides a dimmer circuit based on NFC, its characterized in that, including master control circuit, NFC control circuit, filter rectifier circuit, secondary filter circuit and suppression ripple circuit, master control circuit respectively with rectification filter circuit secondary rectifier circuit with NFC control circuit electric connection, suppression ripple circuit with secondary rectifier circuit electric connection, master control circuit is used for controlling output current and output voltage, NFC control circuit be used for receiving outside NFC inductor's signal and to master control circuit sends control signal, filter rectifier circuit is used for input power rectifier filtering, secondary filter circuit is used for output power rectifier filtering, suppression ripple circuit is used for absorbing output power's ripple current.
2. The NFC-based dimming circuit of claim 1, wherein the master control circuit comprises a first control chip U1 and a receiving portion, the NFC control circuit comprises a second control chip U2 and a transmitting portion, pin 4 of the first control chip U1 is electrically connected to the receiving portion, pin 1 of the second control chip U2 is electrically connected to the transmitting portion, and the receiving portion is electrically connected to the transmitting portion.
3. The NFC-based dimming circuit of claim 2, wherein the NFC control circuit further comprises an NFC receiving unit electrically connected to pin 4 and pin 5 of the second control chip U2, respectively.
4. The NFC-based dimming circuit of claim 3, wherein the NFC control circuit further comprises a third control chip U3, pins 1 and 3 of the third control chip U3 are electrically connected to the transmitter respectively, and pin 5 of the third control chip U3 is electrically connected to pin 3 of the second control chip U2; the third control chip U3 is used for supplying power to the second control chip U2.
5. The NFC-based dimming circuit according to claim 2, wherein the main control circuit includes a primary winding of a transformer T1, an auxiliary winding T2, a rectifying portion, a first energy storage portion, a voltage stabilizing unit, a second energy storage portion, and a first fet Q1, one end of the primary winding of the transformer T1 is electrically connected to the filter and rectifier circuit, the other end of the primary winding of the transformer T1 is electrically connected to a drain of the first fet Q1, a gate of the first fet Q1 is electrically connected to the pin 7 of the first control chip U1, a source of the first fet Q1 is electrically connected to the pin 6 of the first control chip, one end of the auxiliary winding T2 is electrically connected to one end of the rectifying portion, and the other ends of the rectifying portion are respectively connected to one end of the first energy storage portion, one end of the voltage stabilizing unit, and a terminal of the voltage stabilizing unit, One end of the second energy storage part is electrically connected with a pin 8 of the first control chip U1, and the other end of the auxiliary winding T2, the other end of the first energy storage part, the other end of the voltage stabilizing unit and the other end of the second energy storage part are grounded.
6. The NFC-based dimming circuit of claim 5, wherein the secondary filter circuit comprises a secondary winding of a transformer T1, a fourth diode D4, a fifth diode D5 and a fifth capacitor C5, one end of the secondary winding of the transformer T1 is electrically connected to the anode of the fourth diode D4 and the anode of the fifth diode D5, respectively, the cathode of the fourth diode D4 and the cathode of the fifth diode D5 are electrically connected to one end of a fifth capacitor C5, and the other end of the fifth capacitor C5 is grounded to the other end of the secondary winding of the transformer T1.
7. The NFC-based dimming circuit of claim 6, wherein the ripple rejection circuit comprises a plurality of ripple absorption sections, the plurality of ripple absorption sections being connected in parallel; the plurality of ripple absorbing parts are respectively electrically connected with the anode of the fourth diode D4 and the anode of the fifth diode D5.
8. The NFC-based dimming circuit of claim 1, wherein the filter rectification circuit comprises an EMI filter unit and a rectification unit, the EMI filter unit and the rectification unit being electrically connected; the EMI filtering unit is electrically connected with an external power supply, and the rectifying unit is electrically connected with the main control circuit.
9. A PCB board having printed thereon an NFC-based dimming circuit according to any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110350090.7A CN113194588A (en) | 2021-03-31 | 2021-03-31 | Dimming circuit based on NFC and PCB thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110350090.7A CN113194588A (en) | 2021-03-31 | 2021-03-31 | Dimming circuit based on NFC and PCB thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113194588A true CN113194588A (en) | 2021-07-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110350090.7A Pending CN113194588A (en) | 2021-03-31 | 2021-03-31 | Dimming circuit based on NFC and PCB thereof |
Country Status (1)
| Country | Link |
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| CN (1) | CN113194588A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114466487A (en) * | 2021-12-31 | 2022-05-10 | 珠海雷特科技股份有限公司 | Take LED intelligent light adjusting power and LED lamp system of NFC function |
-
2021
- 2021-03-31 CN CN202110350090.7A patent/CN113194588A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114466487A (en) * | 2021-12-31 | 2022-05-10 | 珠海雷特科技股份有限公司 | Take LED intelligent light adjusting power and LED lamp system of NFC function |
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