Direct-current carrier signal transmission circuit, circuit board and lamp

Abstract

The utility model discloses a direct current carrier signal transmission circuit, a circuit board and a lamp, the direct current carrier signal transmission circuit comprises a receiving end and an equipment end, and a control end comprises a receiving coding circuit and a switch control circuit; the input end of the switch control circuit is connected with the output end of the receiving coding circuit, and is used for controlling two output ends of the switch control circuit to respectively output a second level and a third level which are opposite according to a first level output by the receiving coding circuit; the equipment end comprises a rectification filter circuit, a signal sampling circuit, a decoding control circuit and a lighting circuit, two input ends of the rectification filter circuit are respectively connected with two output ends of the switch control circuit, and an input end of the decoding control circuit is connected with one input end of the rectification filter circuit through the signal sampling circuit; the decoding module decodes according to a second level and outputs a control signal; the control end of the lighting circuit is connected with the output end of the decoding control circuit and used for adjusting the lighting state. According to the invention, the control instruction is carried in the DC signal, and the stability and reliability of data transmission are improved.

Description

Technical Field

[0001] This application relates to the field of circuit control technologies, and particularly to a DC carrier signal transmission circuit, a circuit board, and a lamp. Background Art

[0002] In modern homes, commercial, and office settings, lighting systems are increasingly evolving towards intelligence. The popularity of smart lamps has made functions such as dimming, color adjustment, scene control, and remote control the norm. These advanced functions not only enhance the quality of the living and working environments for users but also greatly improve the efficiency of energy management. However, to achieve these intelligent control functions, an essential key link is data transmission.

[0003] In the current market, data transmission is mainly divided into two methods: wired and wireless. Wired transmission is renowned for its stable performance and strong anti-interference ability, capable of ensuring the accurate transmission of control commands to the target device. However, this method requires additional laying of data communication lines, which not only increases the installation cost but also limits the flexibility of the installation location, especially when retrofitting in an existing environment, facing greater challenges.

[0004] In contrast, the wireless transmission method eliminates the need for additional wiring work, greatly simplifies the installation process, and improves flexibility. It uses radio waves in space for data transmission, enabling control signals to cross physical barriers and achieve remote or cross-room control. However, wireless transmission also faces problems such as susceptibility to external interference, such as electromagnetic interference and signal attenuation, which may affect the stability and reliability of data transmission. Utility Model Content

[0005] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application provides a DC carrier signal transmission circuit, a circuit board, and a lamp, which can carry control commands in a DC signal to improve the stability and reliability of data transmission.

[0006] In a first aspect, this application provides a DC carrier signal transmission circuit, including:

[0007] A control terminal, the control terminal includes a receiving and encoding circuit and a switch control circuit. The receiving and encoding circuit is used to receive control commands transmitted externally and output a first level according to the control commands. The input end of the switch control circuit is connected to the output end of the receiving and encoding circuit, and is used to receive the first level and control the first output end of the switch control circuit to output a second level and the second output end to output a third level according to the level state of the first level; wherein, the level states of the second level and the third level are opposite;

[0008] Device side, the device side includes a rectifying and filtering circuit, a signal sampling circuit, a decoding and control circuit, and a lighting circuit. The first input terminal and the second input terminal of the rectifying and filtering circuit are respectively connected to the first output terminal and the second output terminal of the switch control circuit, and are respectively used to receive the second level and the third level. The second output terminal of the rectifying and filtering circuit is grounded. The input terminal of the decoding and control circuit is connected to the first input terminal of the rectifying and filtering circuit through the signal sampling circuit, and is used to receive the second level. The output terminal of the decoding and control circuit is used to decode and output a control signal according to the level state of the second level. The input terminal of the lighting circuit is connected to the first output terminal of the rectifying and filtering circuit, and the control terminal of the lighting circuit is connected to the output terminal of the decoding and control circuit, and is used to adjust the lighting state of the lighting circuit according to the control signal.

[0009] The DC carrier signal transmission circuit according to the first aspect embodiment of the present application has at least the following beneficial effects: The receiving and encoding circuit receives the control instruction transmitted externally, and thus outputs the first level to the switch control circuit. The control information of the control instruction is carried in the first level. Subsequently, the switch control circuit receives the first level, and controls the second level and the third level output by the first output terminal and the second output terminal of the switch control circuit according to the level state of the first level, and the level states of the second level and the third level are opposite. Therefore, the signals output from the first output terminal and the second output terminal of the control switch control circuit are AC signals. The first input terminal and the second input terminal of the rectifying and filtering circuit are respectively connected to the first output terminal and the second output terminal of the control switch control circuit, and convert the AC signal formed by the second level and the third level into a DC signal, and output it from the first output terminal and the second output terminal of the switch control circuit. The input terminal of the lighting circuit is connected to the first output terminal of the rectifying module. Since the AC signal formed by the second level and the third level is converted into a DC signal, a stable power supply can be provided for the lighting circuit. In addition, the acquisition terminal of the decoding and control circuit is connected to the first input terminal of the rectifying and filtering circuit. Since the level states of the second level and the third level are opposite and the second level is generated according to the first level, the control information of the control instruction is also carried in the second level. The decoding and control circuit generates a control signal for the lighting circuit according to the level state of the second level, so as to control the lighting state in the lighting circuit. In the present application, in the power supply line of the lighting circuit, a switch control circuit and a rectifying and filtering circuit are added. Through the cooperation of the switch control circuit and the rectifying and filtering circuit, in addition to not affecting the normal DC power supply of the lighting circuit, the control signal is carried in the DC signal, and the power line (such as the DC power line) is cleverly used as the transmission medium, avoiding the complexity of the traditional wired transmission that requires additional laying of data communication lines, and at the same time effectively avoiding common problems such as electromagnetic interference and signal attenuation in wireless transmission, ensuring the stability and reliability of data transmission.

[0010] According to some embodiments of the first aspect of the present application, the switch control circuit includes a first switch module and a second switch module. The input ends of the first switch module and the second switch module are connected to the output end of the receiving and encoding circuit. The first output end of the switch control circuit is the output end of the first switch module, and the second output end of the switch control circuit is the output end of the second switch module.

[0011] According to some embodiments of the first aspect of the present application, the switch control circuit further includes an inverter. The first switch module includes a first switch transistor and a second switch transistor, and the second switch module includes a third switch transistor and a fourth switch transistor. The input end of the inverter is connected to the output end of the receiving and encoding circuit. The control ends of the first switch transistor and the third switch transistor are connected to the output end of the receiving and encoding circuit. The control ends of the second switch transistor and the fourth switch transistor are connected to the output end of the inverter. The input ends of the first switch transistor and the fourth switch transistor are connected to a first power supply. The output end of the first switch transistor is connected to the input end of the second switch transistor. The output end of the fourth switch transistor is connected to the input end of the third switch transistor. The output ends of the third switch transistor and the second switch transistor are grounded. The first output end of the switch control circuit is arranged between the output end of the first switch transistor and the input end of the second switch transistor, and the second output end of the switch control circuit is arranged between the output end of the fourth switch transistor and the input end of the third switch transistor.

[0012] According to some embodiments of the first aspect of the present application, the first switch module further includes a first resistor and a second resistor, and the second switch module further includes a third resistor and a fourth resistor. The control ends of the first switch transistor and the third switch transistor are respectively connected to the output end of the receiving and encoding circuit through the first resistor and the third resistor. The control ends of the second switch transistor and the fourth switch transistor are respectively connected to the output end of the inverter through the second resistor and the fourth resistor.

[0013] According to some embodiments of the first aspect of the present application, the first switch transistor, the second switch transistor, the third switch transistor, and the fourth switch transistor are NPN-type triodes.

[0014] According to some embodiments of the first aspect of the present application, the receiving and encoding circuit includes a first main control module, a fifth resistor, a sixth resistor, and a first capacitor. The power supply end of the first main control module is connected to a first power supply through the fifth resistor. A ground connection is made between the fifth resistor and the power supply end of the first main control module through the first capacitor. The input end of the main control module is used to receive a control instruction transmitted externally. The output end of the main control module is connected to the input end of the switch control circuit through the sixth resistor.

[0015] According to some embodiments of the first aspect of the present application, the rectifying and filtering circuit includes a rectifying module and a second capacitor. The first input terminal and the second input terminal of the rectifying module are respectively connected to the first output terminal and the second output terminal of the switch control circuit, and are respectively used to receive the second level and the third level. The second output terminal of the rectifying module is grounded, and the first output terminal of the rectifying module is also grounded through the second capacitor between the input terminal of the lighting circuit.

[0016] According to some embodiments of the first aspect of the present application, the decoding control circuit includes a second main control module, a seventh resistor, an eighth resistor, and a third capacitor. The signal sampling circuit includes a ninth resistor and a tenth resistor. The lighting circuit includes an LED lamp group and a fifth switching tube. The power supply terminal of the second main control module is connected to the first output terminal of the rectifying module through the seventh resistor to receive the second level. A third capacitor is grounded between the seventh resistor and the power supply terminal of the second main control module. The input terminal of the LED lamp group is connected to the first output terminal of the rectifying module. The output terminal of the LED lamp group is connected to the input terminal of the fifth switching tube. The output terminal of the fifth switching tube is grounded. The input terminal of the second main control module is the input terminal of the decoding control circuit and is connected to the first input terminal of the rectifying and filtering circuit through the ninth resistor. A tenth resistor is grounded between the ninth resistor and the input terminal of the second main control module. The output terminal of the second main control module is connected to the control terminal of the fifth switching tube through the eighth resistor to output a control signal according to the level state of the second level to control the lighting state of the LED lamp group.

[0017] In a second aspect, the present application further provides a circuit board including the DC carrier signal transmission circuit according to any one of the embodiments of the first aspect.

[0018] In a third aspect, the present application further provides a lighting fixture including the circuit board according to the embodiment of the second aspect.

[0019] The additional aspects and advantages of the present application will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The additional aspects and advantages of the present application will become apparent and be easily understood in conjunction with the following description of the embodiments with reference to the accompanying drawings, in which:

[0021] Figure 1 is a circuit block diagram of the DC carrier signal transmission circuit according to some embodiments of the first aspect of the present application;

[0022] Figure 2 is a circuit diagram of the switch control circuit according to some embodiments of the first aspect of the present application;

[0023] Figure 3 Circuit diagram of the receiving encoding circuit for some embodiments of the first aspect of the present application;

[0024] Figure 4 Circuit diagram of the rectifying and filtering circuit, signal sampling circuit, decoding control circuit, and lighting circuit for some embodiments of the first aspect of the present application;

[0025] Figure 5 Signal schematic diagram of the DC carrier signal transmission circuit for one embodiment of the present application. Detailed implementation manners

[0026] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as a limitation to the present application.

[0027] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0028] In the description of the present application, if the first and second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0029] In the description of the present application, unless otherwise clearly defined, terms such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific content of the technical solution.

[0030] In modern homes, commercial, and office places, the lighting system is increasingly developing towards the direction of intelligence. The popularization of smart lamps has made functions such as dimming, color adjustment, scene control, and remote control become normal. These advanced functions not only improve the quality of the user's living and working environment but also greatly enhance the efficiency of energy management. However, to achieve these intelligent control functions, an essential key link is data transmission.

[0031] In the current market, data transmission is mainly divided into two methods: wired and wireless. Wired transmission is known for its stable performance and strong anti-interference ability, and can ensure that control instructions are accurately transmitted to the target device. However, this method requires additional laying of data communication lines, which not only increases the installation cost but also limits the flexibility of the installation location. Especially when retrofitting in a built environment, it faces greater challenges.

[0032] In contrast, the wireless transmission method does not require additional wiring work, greatly simplifies the installation process, and improves flexibility. It uses radio waves in space for data transmission, enabling control signals to cross physical barriers and achieve remote or cross-room control. However, wireless transmission also faces problems such as being vulnerable to external interference, such as electromagnetic interference and signal attenuation, which may affect the stability and reliability of data transmission.

[0033] Based on this, the present application provides a DC carrier signal transmission circuit, a circuit board, and a lamp to solve the above-mentioned technical problems. The technical solutions provided by the present application will be described in detail one by one below.

[0034] In the first aspect, referring to Figure 1 , the present application provides a DC carrier signal transmission circuit: a control end and a device end. The control end includes a receiving and encoding circuit and a switch control circuit. The receiving and encoding circuit is used to receive control instructions transmitted externally and output a first level according to the control instructions. The input end of the switch control circuit is connected to the output end of the receiving and encoding circuit, and is used to receive the first level and control the first output end of the switch control circuit to output a second level and the second output end to output a third level according to the level state of the first level; wherein, the level states of the second level and the third level are opposite. The device end includes a rectifying and filtering circuit, a signal sampling circuit, a decoding and control circuit, and a lighting circuit. The first input end and the second input end of the rectifying and filtering circuit are respectively connected to the first output end and the second output end of the switch control circuit, and are respectively used to receive the second level and the third level. The second output end of the rectifying and filtering circuit is grounded. The input end of the decoding and control circuit is connected to the first input end of the rectifying and filtering circuit through the signal sampling circuit, and is used to receive the second level. The output end of the decoding and control circuit is used to decode and output a control signal according to the level state of the second level. The input end of the lighting circuit is connected to the first output end of the rectifying and filtering circuit, and the control end of the lighting circuit is connected to the output end of the decoding and control circuit, and is used to adjust the lighting state of the lighting circuit according to the control signal.

[0035] The receiving and encoding circuit receives the control instructions transmitted externally, and thus outputs a first level to the switch control circuit. The control information of the control instructions is carried in the first level. Subsequently, the switch control circuit receives the first level and controls the second level and the third level output from the first output terminal and the second output terminal of the switch control circuit according to the level state of the first level. Moreover, the level states of the second level and the third level are opposite, so that the signals output from the first output terminal and the second output terminal of the control switch control circuit are AC signals. The first input terminal and the second input terminal of the rectifying and filtering circuit are respectively connected to the first output terminal and the second output terminal of the control switch control circuit, convert the AC signal formed by the second level and the third level into a DC signal, and output it from the first output terminal and the second output terminal of the switch control circuit. The input terminal of the lighting circuit is connected to the first output terminal of the rectifying module DB1. Since the AC signal formed by the second level and the third level is converted into a DC signal, a stable power supply can be provided for the lighting circuit. In addition, the acquisition terminal of the decoding control circuit is connected to the first output terminal of the switch control circuit. Since the level states of the second level and the third level are opposite and the second level is generated according to the first level, the control information of the control instructions is also carried in the second level. The decoding control circuit generates a control signal for the lighting circuit according to the level state of the second level, thereby controlling the lighting state in the lighting circuit. In the present application, in the power supply line of the lighting circuit, a switch control circuit and a rectifying and filtering circuit are added. Through the cooperation of the switch control circuit and the rectifying and filtering circuit, in addition to not affecting the normal DC power supply of the lighting circuit, the control signal is also carried in the DC signal, making clever use of the power line (such as the DC power line) as the transmission medium, avoiding the complexity of the need for additional laying of data communication lines in traditional wired transmission, and at the same time effectively avoiding common problems such as electromagnetic interference and signal attenuation in wireless transmission, ensuring the stability and reliability of data transmission.

[0036] It should be noted that the control terminal and the device terminal can be the same product, or two different products, or there can be multiple control terminals corresponding to one device terminal. The control terminal converts the digital signals 0 and 1 into the positive and negative voltages of the DC power supply, and the device terminal obtains the data information by detecting the polarities of the positive and negative voltages.

[0037] Among them, the receiving and encoding circuit receiving the control instructions transmitted externally can be generated by pressing a key or by means of Bluetooth or wifi of a remote device, and the present application does not make any limitation in this regard.

[0038] Refer to Figure 2, It can be understood that the switch control circuit includes a first switch module and a second switch module. The input ends of the first switch module and the second switch module are connected to the output end of the receiving and encoding circuit. The first output end of the switch control circuit is the output end of the first switch module, and the second output end of the switch control circuit is the output end of the second switch module. By subdividing the switch control circuit into two independent first switch module and second switch module, different parts of the control signal can be processed separately or different control logics can be executed. This makes the entire circuit more flexible in signal processing and can be customized and optimized according to specific requirements. Adopting a differential signal transmission mode, that is, signals with opposite level states of the second level and the third level, can effectively suppress common-mode noise and electromagnetic interference and improve the reliability and stability of signal transmission.

[0039] Continue to refer to Figure 2 , It can be understood that the switch control circuit further includes an inverter U3; the first switch module includes a first switch tube Q1 and a second switch tube Q2, and the second switch module includes a third switch tube Q3 and a fourth switch tube Q4. The input end of the inverter U3 is connected to the output end of the receiving and encoding circuit. The control ends of the first switch tube Q1 and the third switch tube Q3 are connected to the output end of the receiving and encoding circuit. The control ends of the second switch tube Q2 and the fourth switch tube Q4 are connected to the output end of the inverter U3. The input ends of the first switch tube Q1 and the fourth switch tube Q4 are connected to the first power supply. The output end of the first switch tube Q1 is connected to the input end of the second switch tube Q2. The output end of the fourth switch tube Q4 is connected to the input end of the third switch tube Q3. The output ends of the third switch tube Q3 and the second switch tube Q2 are grounded; the first output end of the switch control circuit is arranged between the output end of the first switch tube Q1 and the input end of the second switch tube Q2, and the second output end of the switch control circuit is arranged between the output end of the fourth switch tube Q4 and the input end of the third switch tube Q3. The first switch tube Q1 and the third switch tube Q3 are directly controlled by the receiving and encoding circuit, while the second switch tube Q2 and the fourth switch tube Q4 are indirectly controlled through the inverter U3.

[0040] Among them, the inverter U3 can also be a dedicated MOS tube driver integrated circuit to drive 4 N-channel MOS tubes, or 2 P-channel MOS tubes and 2 N-channel MOS tubes to achieve the same function.

[0041] In one embodiment, when the first level output by the switch control circuit is a low level, the first switch tube Q1 and the third switch tube Q3 are turned off, and the second switch tube Q2 and the fourth switch tube Q4 are turned on due to the action of the inverter U3. Therefore, the second level output by the corresponding first output end is a low level, and the third level output by the second output end is a high level.

[0042] In another embodiment, when the first level output by the switch control circuit is a high level, the first switching transistor Q1 and the third switching transistor Q3 are turned on, and the second switching transistor Q2 and the fourth switching transistor Q4 are turned off due to the effect of the inverter U3. Therefore, the second level output by the corresponding first output terminal is a high level, and the third level output by the second output terminal is a low level.

[0043] As can be seen from the above, the level state of the second level is the same as that of the first level. Therefore, the acquisition terminal of the decoding control circuit is connected to the first output terminal of the switch control circuit to receive the second level. That is, by decoding the second level by the decoding control circuit, relevant control instructions can be obtained, and then a control signal is generated to adjust the illumination state of the lighting circuit. In addition, it should be noted that the acquisition terminal of the decoding control circuit can also be connected to the second output terminal to obtain the third level for decoding.

[0044] Continue to refer to Figure 2 It can be understood that the first switching module further includes a first resistor R1 and a second resistor R2, and the second switching module further includes a third resistor R3 and a fourth resistor R4. The control terminals of the first switching transistor Q1 and the third switching transistor Q3 are respectively connected to the output terminal of the receiving and encoding circuit through the first resistor R1 and the third resistor R3, and the control terminals of the second switching transistor Q2 and the fourth switching transistor Q4 are respectively connected to the output terminal of the inverter U3 through the second resistor R2 and the fourth resistor R4. By respectively connecting the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 in series at the control terminals of the first switching transistor Q1 and the second switching transistor Q2, the third switching transistor Q3 and the fourth switching transistor Q4, the current flowing through the control terminals of the switching transistors can be effectively limited, which helps to prevent the switching transistors or other circuit components from being damaged due to excessive current. In addition, the connection line between the resistor and the control terminal of the switching transistor may introduce certain noise or interference. By connecting the resistor in series, the noise can be attenuated to a certain extent, and the quality of the control signal can be improved.

[0045] It should be noted that the first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, and the fourth switching transistor Q4 are NPN-type triodes. Taking the first switching transistor Q1 as an example, the input terminal of the first switching transistor Q1 is the collector of the NPN-type triode, the control terminal of the first switching transistor Q1 is the base of the NPN-type triode, and the output terminal of the first switching transistor Q1 is the emitter of the NPN-type triode.

[0046] Refer to Figure 3, it can be understood that the receiving encoding circuit includes a first main control module U1, a fifth resistor R5, a sixth resistor R6, and a first capacitor C1. The power supply terminal of the first main control module U1 is connected to the first power supply through the fifth resistor R5, and the connection between the fifth resistor R5 and the power supply terminal of the first main control module U1 is grounded through the first capacitor C1. The input terminal of the main control module is used to receive the control instructions transmitted externally, and the output terminal of the main control module is connected to the input terminal of the switch control circuit through the sixth resistor R6. The first capacitor C1 and the fifth resistor R5 form a basic RC filtering circuit, which can effectively filter out the noise and interference from the first power supply and provide a stable and clean power supply environment for the first main control module U1. The sixth resistor R6 acts as a current limiting resistor and is connected in series between the output terminal of the main control module and the input terminal of the switch control circuit, limiting the current flowing through the input terminal of the switch control circuit and preventing damage to circuit components due to excessive current. At the same time, the sixth resistor R6 also plays a certain role in signal attenuation, helping to reduce the noise and interference during signal transmission.

[0047] Referring to Figure 4 , it can be understood that the rectifying and filtering circuit includes a rectifying module DB1 and a second capacitor C2. The first input terminal and the second input terminal of the rectifying module DB1 are respectively connected to the first output terminal and the second output terminal of the switch control circuit, and are respectively used to receive the second level and the third level. The second output terminal of the rectifying module DB1 is grounded, and the connection between the first output terminal of the rectifying module DB1 and the input terminal of the lighting circuit is also grounded through the second capacitor C2. The second capacitor C2 acts as a filtering capacitor and can effectively smooth the rectified DC output.

[0048] Continuing to refer to Figure 4, It can be understood that the decoding control circuit includes a second main control module U2, a seventh resistor R7, an eighth resistor R8, and a third capacitor C3. The signal sampling circuit includes a ninth resistor R9 and a tenth resistor R10. The lighting circuit includes an LED lamp group and a fifth switching tube S1. The power supply terminal of the second main control module U2 is connected to the first output terminal of the rectification module DB1 through the seventh resistor R7 for receiving the second level. The connection between the seventh resistor R7 and the power supply terminal of the second main control module U2 is grounded through the third capacitor C3. The input terminal of the LED lamp group is connected to the first output terminal of the rectification module DB1. The output terminal of the LED lamp group is connected to the input terminal of the fifth switching tube S1. The output terminal of the fifth switching tube S1 is grounded. The input terminal of the second main control module U2 is the acquisition terminal of the decoding control circuit and is connected to the first output terminal of the switch control circuit through the ninth resistor R9. The connection between the ninth resistor R9 and the input terminal of the second main control module U2 is grounded through the tenth resistor R10. The output terminal of the second main control module U2 is connected to the control terminal of the fifth switching tube S1 through the eighth resistor R8, for outputting a control signal according to the level state of the second level to control the lighting state of the LED lamp group. The RC filter circuit composed of the seventh resistor R7 and the third capacitor C3 provides a stable power supply environment for the second main control module U2, filters out the voltage fluctuations and noises from the rectification module DB1, and ensures the stable operation of the main control module. The eighth resistor R8 serves as a current-limiting resistor, which can limit the magnitude of the current flowing from the output terminal of the second main control module U2 to the control terminal of the fifth switching tube S1, protecting the control terminal of the fifth switching tube S1 and the circuit part connected thereto. The ninth resistor R9 is connected between the input terminal of the second main control module U2 and the first output terminal of the switch control circuit and serves as a signal acquisition resistor, so that the second main control module U2 can perform subsequent control operations based on this signal.

[0049] Among them, the fifth switching tube can be an N-channel MOS tube. The input terminal of the fifth switching tube is the drain of the N-channel MOS tube, the control terminal of the fifth switching tube is the gate of the N-channel MOS tube, and the control terminal of the fifth switching tube is the source of the N-channel MOS tube. It is also possible to change the control circuit into an integrated circuit or use an integrated circuit to drive two P-channel MOS tubes and two N-channel MOS tubes to achieve the same function.

[0050] In a second aspect, the present application further provides a circuit board, including the DC carrier signal transmission circuit of any one of the embodiments in the first aspect. The functions and principles of the circuit board in this embodiment are all based on the above DC carrier signal transmission circuit. Therefore, the circuit board in this embodiment has the same beneficial effects as the above DC carrier signal transmission circuit. For the sake of brevity, it will not be repeated here.

[0051] In a third aspect, the present application also provides a lighting fixture, which includes the circuit board of the embodiment of the second aspect. Similarly, the functions and principles of the lighting fixture in this embodiment are both based on the above circuit board. Therefore, the lighting fixture in this embodiment has the same beneficial effects as the above circuit board. For the sake of brevity, the description will not be repeated here.

[0052] The embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present application.

Claims

1. A DC carrier signal transmission circuit, characterized in that, Comprising: A control terminal, the control terminal includes a receiving and encoding circuit and a switch control circuit. The receiving and encoding circuit is configured to receive a control instruction transmitted externally and output a first level according to the control instruction; The input end of the switch control circuit is connected to the output end of the receiving and encoding circuit, and is configured to receive the first level and control the first output end of the switch control circuit to output a second level and the second output end to output a third level according to the level state of the first level; wherein, the level states of the second level and the third level are opposite; A device terminal, the device terminal includes a rectifying and filtering circuit, a signal sampling circuit, a decoding and control circuit, and a lighting circuit. The first input end and the second input end of the rectifying and filtering circuit are respectively connected to the first output end and the second output end of the switch control circuit, and are respectively configured to receive the second level and the third level. The second output end of the rectifying and filtering circuit is grounded; the input end of the decoding and control circuit is connected to the first input end of the rectifying and filtering circuit through the signal sampling circuit, and is configured to receive the second level. The output end of the decoding and control circuit is configured to decode and output a control signal according to the level state of the second level; The input end of the lighting circuit is connected to the first output end of the rectifying and filtering circuit, and the control end of the lighting circuit is connected to the output end of the decoding and control circuit, and is configured to adjust the lighting state of the lighting circuit according to the control signal.

2. The DC carrier signal transmission circuit according to claim 1, wherein The switch control circuit includes a first switch module and a second switch module. The input ends of the first switch module and the second switch module are connected to the output end of the receiving and encoding circuit. The first output end of the switch control circuit is the output end of the first switch module, and the second output end of the switch control circuit is the output end of the second switch module.

3. The DC carrier signal transmission circuit according to claim 2, wherein The switch control circuit further includes an inverter; the first switch module includes a first switch tube and a second switch tube, the second switch module includes a third switch tube and a fourth switch tube. The input end of the inverter is connected to the output end of the receiving and encoding circuit. The control ends of the first switch tube and the third switch tube are connected to the output end of the receiving and encoding circuit. The control ends of the second switch tube and the fourth switch tube are connected to the output end of the inverter. The input ends of the first switch tube and the fourth switch tube are connected to a first power supply. The output end of the first switch tube is connected to the input end of the second switch tube. The output end of the fourth switch tube is connected to the input end of the third switch tube. The output ends of the third switch tube and the second switch tube are grounded; the first output end of the switch control circuit is disposed between the output end of the first switch tube and the input end of the second switch tube, and the second output end of the switch control circuit is disposed between the output end of the fourth switch tube and the input end of the third switch tube.

4. The DC carrier signal transmission circuit according to claim 3, wherein The first switch module further includes a first resistor and a second resistor, and the second switch module further includes a third resistor and a fourth resistor. The control terminals of the first switch transistor and the third switch transistor are respectively connected to the output terminal of the receiving and encoding circuit through the first resistor and the third resistor, and the control terminals of the second switch transistor and the fourth switch transistor are respectively connected to the output terminal of the inverter through the second resistor and the fourth resistor.

5. The DC carrier signal transmission circuit according to claim 3, characterized in that, The first switch transistor, the second switch transistor, the third switch transistor, and the fourth switch transistor are NPN-type triodes.

6. The DC carrier signal transmission circuit according to claim 1, wherein The receiving and encoding circuit includes a first main control module, a fifth resistor, a sixth resistor, and a first capacitor. The power supply terminal of the first main control module is connected to a first power supply through the fifth resistor, and is grounded through the first capacitor between the fifth resistor and the power supply terminal of the first main control module. The input terminal of the main control module is used to receive a control instruction transmitted externally, and the output terminal of the main control module is connected to the input terminal of the switch control circuit through the sixth resistor.

7. The DC carrier signal transmission circuit according to claim 1, wherein The rectifying and filtering circuit includes a rectifying module and a second capacitor. The first input terminal and the second input terminal of the rectifying module are respectively connected to the first output terminal and the second output terminal of the switch control circuit, and are respectively used to receive the second level and the third level. The second output terminal of the rectifying module is grounded, and the first output terminal of the rectifying module and the input terminal of the lighting circuit are also grounded through the second capacitor.

8. The DC carrier signal transmission circuit according to claim 7, characterized in that, The decoding and control circuit includes a second main control module, a seventh resistor, an eighth resistor, and a third capacitor. The signal sampling circuit includes a ninth resistor and a tenth resistor. The lighting circuit includes an LED lamp group and a fifth switch transistor. The power supply terminal of the second main control module is connected to the first output terminal of the rectifying module through the seventh resistor to receive the second level, and is grounded through the third capacitor between the seventh resistor and the power supply terminal of the second main control module. The input terminal of the LED lamp group is connected to the first output terminal of the rectifying module, the output terminal of the LED lamp group is connected to the input terminal of the fifth switch transistor, the output terminal of the fifth switch transistor is grounded. The input terminal of the second main control module is the input terminal of the decoding and control circuit, and is connected to the first input terminal of the rectifying and filtering circuit through the ninth resistor, and is grounded through the tenth resistor between the ninth resistor and the input terminal of the second main control module. The output terminal of the second main control module is connected to the control terminal of the fifth switch transistor through the eighth resistor, and is used to output a control signal according to the level state of the second level to control the lighting state of the LED lamp group.

9. A circuit board, characterized in that, It includes the DC carrier signal transmission circuit according to any one of claims 1 to 8.

10. A lighting fixture, characterized in that, It includes the circuit board according to claim 9.

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