Infrared transmitting device based on PLC power line carrier technology

Abstract

The utility model discloses a signal emission technical field's infrared emission device based on PLC power line carrier technology, including power, and power provides the working voltage for infrared emission device, and its characterized in that, the output of power is electrically connected electrolytic capacitor, the first end of current -limiting infrared LED lamp group and the first end of sixth current -limiting resistance, the second end of current -limiting infrared LED lamp group is electrically connected electrolytic capacitor's second end, the first end of sixth current -limiting resistance is electrically connected microcontroller's GPIO port and the first end of seventh current -limiting resistance, the second end of sixth current -limiting resistance is electrically connected MOS tube's gate and the first end of pull -down resistance. The utility model discloses through setting filter capacitor and current -limiting resistance, can carry out smooth restriction to the current and voltage of each branch, prevent component overvoltage overcurrent damage, through setting the infrared signal emission structure of 38KHz's carrier modulation, can support multichannel signal control, improve the anti -interference ability of circuit.

Description

Technical Field

[0001] This utility model relates to the field of signal transmission technology, specifically an infrared transmitting device based on PLC power line carrier technology. Background Technology

[0002] PLC (Power Line Communication) is a technology that uses power lines as the communication medium to transmit data, and is used for data transmission in communication devices such as infrared transmitters. Infrared transmitters are electronic devices that emit infrared light and are widely used in remote control, communication, and security fields. Based on different control methods, infrared transmitters are classified into infrared remote control transmitters, infrared beam transmitters, and infrared sensor transmitters.

[0003] Existing infrared transmitters are mostly single-point controlled, with weak anti-interference capabilities, which can easily lead to overvoltage and overcurrent damage to the infrared emitting elements, thus hindering the reliability and stability of the infrared emitting device. Utility Model Content

[0004] The purpose of this invention is to provide an infrared transmitting device based on PLC power line carrier technology. By setting filter capacitors and current-limiting resistors, the current and voltage of each branch can be stably limited to prevent damage to components due to overvoltage and overcurrent. By setting a 38KHz carrier-modulated infrared signal transmitting structure, it can support multi-channel signal control and improve the anti-interference capability of the circuit.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An infrared emitting device based on PLC power line carrier technology includes a power supply that provides operating voltage to the infrared emitting device. The power supply's output terminal is electrically connected to an electrolytic capacitor C1, a first terminal of a current-limiting infrared LED group, and a first terminal of a sixth current-limiting resistor R6. The second terminal of the current-limiting infrared LED group is electrically connected to a second terminal of the electrolytic capacitor C1. The first terminal of the sixth current-limiting resistor R6 is electrically connected to a GPIO (General Purpose Input / Output) port of a microcontroller and a first terminal of a seventh current-limiting resistor R7. The second terminal of the sixth current-limiting resistor R6 is electrically connected to the gate of a MOSFET Q2 and a first terminal of a pull-down resistor R5. The drain of the MOSFET Q2 is electrically connected to a second terminal of the current-limiting infrared LED group, and the source of the MOSFET Q2 is electrically connected to a second terminal of the pull-down resistor R5. The second terminal of pull-down resistor R5 is electrically connected to the ground terminal of the crystal oscillator. The second terminal of the seventh current-limiting resistor R7 is electrically connected to the emitter of transistor Q1. The base of transistor Q1 is electrically connected to the output of the crystal oscillator. The collector of transistor Q1 is electrically connected to the first terminal of the ninth current-limiting resistor R9. The second terminal of the ninth current-limiting resistor R9 is electrically connected to the third pin of the 555 timer. The fourth pin of the 555 timer is electrically connected to the enable terminal of the microcontroller. The sixth pin of the 555 timer is electrically connected to the first terminal of the frequency generating resistor R8. The second terminal of the frequency generating resistor R8 is electrically connected to the seventh pin of the 555 timer and the first terminal of the frequency generating capacitor C2. The second terminal of the frequency generating capacitor C2 is electrically connected to the first pin of the 555 timer. The first pin of the 555 timer is grounded.

[0006] As a further embodiment of this utility model: the current-limiting infrared LED lamp group includes a first current-limiting resistor R1, the first end of the first current-limiting resistor R1 is electrically connected to the output terminal of the power supply and the first end of the second current-limiting resistor R2, the second end of the first current-limiting resistor R1 is electrically connected to the first end of the first infrared LED1, the second end of the second current-limiting resistor R2 is electrically connected to the first end of the second infrared LED2, the second end of the second infrared LED2 is electrically connected to the second end of the first infrared LED1, the second end of the first infrared LED1 is electrically connected to the second end of the electrolytic capacitor C1, the first end of the second current-limiting resistor R2 is electrically connected to the first end of the third current-limiting resistor R3, the second end of the third current-limiting resistor R3 is electrically connected to the first end of the third infrared LED3, and the second end of the third infrared LED3 is grounded.

[0007] As a further embodiment of this utility model: the electrolytic capacitor C1, the first current-limiting resistor R1, the second current-limiting resistor R2 and the third current-limiting resistor R3 constitute a power supply filter circuit. The power supply filter circuit is used to filter out the voltage ripple of the power supply output. By filtering out the voltage ripple of the power supply output, the output voltage of the power supply can be stabilized.

[0008] As a further embodiment of this utility model: the resistance of the sixth current-limiting resistor R6 is 1KΩ, the resistance of the pull-down resistor R5 is 10KΩ, the GPIO port is used for modulation signals, the sixth current-limiting resistor R6, the pull-down resistor R5, the GPIO port and the MOS transistor Q2 constitute a driving circuit, and the sixth current-limiting resistor R6 is used for current limiting protection of the GPIO port.

[0009] As a further embodiment of this invention: the MOS transistor Q2 is a control switch, used to control the conduction and cutoff of the third infrared lamp LED3, and the GPIO port of the microcontroller is used to send GPIO control signals to the gate of the MOS transistor Q2.

[0010] As a further aspect of this invention: the pull-down resistor R5 is used to turn off the MOSFET Q2 when there is no signal input. By setting the pull-down resistor R5, the potential of the gate of the MOSFET Q2 can be lowered, so that the MOSFET Q2 can be reliably turned off, thereby improving the stability of the circuit.

[0011] As a further embodiment of this invention: the 555 timer, the frequency generating resistor R8, and the frequency generating capacitor C2 constitute a multivibrator, which is used to generate a 38kHz carrier signal.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. In this utility model, by setting a filter capacitor and a current-limiting resistor, the current and voltage of each branch can be stably limited to prevent damage to components due to overvoltage and overcurrent. By setting a 38KHz carrier-modulated infrared signal transmission structure, it can support multi-channel signal control and improve the anti-interference capability of the circuit.

[0013] 2. In this utility model, by setting a pull-down resistor, the potential of the MOS transistor gate can be lowered, so that the MOS transistor can be reliably cut off, thereby improving the stability of the circuit. By setting the first infrared lamp and the second infrared lamp to be constantly lit lamps, and the third infrared lamp being controlled by the MOS transistor, a multi-mode infrared emission mode can be formed. Attached Figure Description

[0014] Figure 1 This is the infrared emitting circuit diagram of this utility model. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example: Please see Figure 1 In this embodiment of the invention, an infrared emitting device based on PLC power line carrier technology includes a power supply that provides operating voltage to the infrared emitting device. The power supply's output terminal is electrically connected to an electrolytic capacitor C1, the first terminal of a current-limiting infrared LED group, and the first terminal of a sixth current-limiting resistor R6. The second terminal of the current-limiting infrared LED group is electrically connected to the second terminal of the electrolytic capacitor C1. The first terminal of the sixth current-limiting resistor R6 is electrically connected to a GPIO (General Purpose Input / Output) port of a microcontroller and the first terminal of a seventh current-limiting resistor R7. The second terminal of the sixth current-limiting resistor R6 is electrically connected to the gate of a MOSFET Q2 and the first terminal of a pull-down resistor R5. The drain of the MOSFET Q2 is electrically connected to the second terminal of the current-limiting infrared LED group, and the source of the MOSFET Q2 is electrically connected to the pull-down resistor R5. The second terminal of resistor R5 is electrically connected to the ground terminal of the crystal oscillator. The second terminal of the seventh current-limiting resistor R7 is electrically connected to the emitter of transistor Q1. The base of transistor Q1 is electrically connected to the output of the crystal oscillator. The collector of transistor Q1 is electrically connected to the first terminal of the ninth current-limiting resistor R9. The second terminal of the ninth current-limiting resistor R9 is electrically connected to the third pin of the 555 timer. The fourth pin of the 555 timer is electrically connected to the enable terminal of the microcontroller. The sixth pin of the 555 timer is electrically connected to the first terminal of the frequency generating resistor R8. The second terminal of the frequency generating resistor R8 is electrically connected to the seventh pin of the 555 timer and the first terminal of the frequency generating capacitor C2. The second terminal of the frequency generating capacitor C2 is electrically connected to the first pin of the 555 timer. The first pin of the 555 timer is grounded.

[0017] In this embodiment, the third pin of the 555 timer is the output pin of the 555 timer.

[0018] In this embodiment, the capacitance of electrolytic capacitor C1 is 10μF.

[0019] Preferably, the current-limiting infrared LED lamp group includes a first current-limiting resistor R1, the first end of the first current-limiting resistor R1 is electrically connected to the output terminal of the power supply and the first end of the second current-limiting resistor R2, the second end of the first current-limiting resistor R1 is electrically connected to the first end of the first infrared LED 1, the second end of the second current-limiting resistor R2 is electrically connected to the first end of the second infrared LED 2, the second end of the second infrared LED 2 is electrically connected to the second end of the first infrared LED 1, the second end of the first infrared LED 1 is electrically connected to the second end of the electrolytic capacitor C1, the first end of the second current-limiting resistor R2 is electrically connected to the first end of the third current-limiting resistor R3, the second end of the third current-limiting resistor R3 is electrically connected to the first end of the third infrared LED 3, and the second end of the third infrared LED 3 is grounded.

[0020] In this embodiment, the first infrared LED1 and the second infrared LED2 are both always-on LEDs, and the third infrared LED3 is controlled by the MOSFET Q2 to form a multi-mode infrared emission mode.

[0021] In this embodiment, the first current-limiting resistor R1 and the first infrared LED1 form the first infrared LED branch, the second current-limiting resistor R2 and the second infrared LED2 form the second infrared LED branch, and the third current-limiting resistor R3 and the third infrared LED3 form the third infrared LED branch.

[0022] In this embodiment, the resistance values ​​of the first current-limiting resistor R1, the second current-limiting resistor R2, and the third current-limiting resistor R3 are all 100Ω.

[0023] Preferably, the electrolytic capacitor C1, the first current-limiting resistor R1, the second current-limiting resistor R2, and the third current-limiting resistor R3 constitute a power supply filter circuit. The power supply filter circuit is used to filter out the voltage ripple of the power supply output. By filtering out the voltage ripple of the power supply output, the output voltage of the power supply can be stabilized.

[0024] In this embodiment, the power supply provides a working voltage of +5V.

[0025] Preferably, the resistance of the sixth current-limiting resistor R6 is 1KΩ, the resistance of the pull-down resistor R5 is 10KΩ, the GPIO port is used for modulation signals, and the sixth current-limiting resistor R6, the pull-down resistor R5, the GPIO port and the MOSFET Q2 constitute a driving circuit. The sixth current-limiting resistor R6 is used to limit the current and protect the GPIO port.

[0026] Preferably, MOSFET Q2 is a control switch used to control the conduction and cutoff of the third infrared LED 3, and the GPIO port of the microcontroller is used to send GPIO control signals to the gate of MOSFET Q2.

[0027] Preferably, the pull-down resistor R5 is used to turn off the MOSFET Q2 when there is no signal input. By setting the pull-down resistor R5, the potential of the gate of the MOSFET Q2 can be pulled down, so that the MOSFET Q2 can be reliably turned off, thereby improving the stability of the circuit.

[0028] Preferably, the 555 timer, frequency generating resistor R8, and frequency generating capacitor C2 constitute a multivibrator, which is used to generate a 38kHz carrier signal.

[0029] In this embodiment, the fourth pin of the 555 timer is connected to an enable control signal to control the start and stop of the 555 timer.

[0030] In this embodiment, the frequency generating resistor R8 and the frequency generating capacitor C2 constitute an RC circuit.

[0031] The working principle of this embodiment is as follows: The infrared emitting device in this embodiment is an infrared signal emitting system based on 38kHz carrier modulation. It controls the output of multiple infrared LEDs through coded signals to achieve remote control or communication. The +5V power supply is filtered by a 10μF electrolytic capacitor to eliminate power supply ripple and provide a stable voltage for subsequent circuits. The first infrared LED1 and the second infrared LED2 are directly connected to the +5V power supply through a 100Ω first current-limiting resistor and a second current-limiting resistor. They are either constantly lit or driven by other control signals to emit constant infrared light. The third infrared LED3 is controlled to conduct by the MOSFET Q2 to form a multi-mode infrared emission mode. When the GPIO port outputs a high level, the gate voltage of the MOSFET Q2 rises, the drain conducts, and the third infrared LED3 emits light. The 555 timer is used to generate a 38kHz square wave signal. The 38kHz frequency signal is the standard carrier for infrared communication, which can filter out ambient light interference and improve the anti-interference capability of the circuit. The output frequency of the 555 timer is determined by the RC circuit.

[0032] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. An infrared transmitting device based on PLC power line carrier technology, comprising a power supply, wherein the power supply provides operating voltage to the infrared transmitting device, characterized in that, The power supply output is electrically connected to electrolytic capacitor C1, the first terminal of the current-limiting infrared LED group, and the first terminal of the sixth current-limiting resistor R6. The second terminal of the current-limiting infrared LED group is electrically connected to the second terminal of electrolytic capacitor C1. The first terminal of the sixth current-limiting resistor R6 is electrically connected to the GPIO port of the microcontroller and the first terminal of the seventh current-limiting resistor R7. The second terminal of the sixth current-limiting resistor R6 is electrically connected to the gate of MOSFET Q2 and the first terminal of pull-down resistor R5. The drain of MOSFET Q2 is electrically connected to the second terminal of the current-limiting infrared LED group. The source of MOSFET Q2 is electrically connected to the second terminal of pull-down resistor R5. The second terminal of pull-down resistor R5 is electrically connected to the ground terminal of the crystal oscillator. The seventh current-limiting resistor R7 is electrically connected to the gate of MOSFET Q2 and the first terminal of pull-down resistor R5. The second terminal of resistor R7 is electrically connected to the emitter of transistor Q1. The base of transistor Q1 is electrically connected to the output of the crystal oscillator. The collector of transistor Q1 is electrically connected to the first terminal of the ninth current-limiting resistor R9. The second terminal of the ninth current-limiting resistor R9 is electrically connected to the third pin of the 555 timer. The fourth pin of the 555 timer is electrically connected to the enable pin of the microcontroller. The sixth pin of the 555 timer is electrically connected to the first terminal of the frequency generating resistor R8. The second terminal of the frequency generating resistor R8 is electrically connected to the seventh pin of the 555 timer and the first terminal of the frequency generating capacitor C2. The second terminal of the frequency generating capacitor C2 is electrically connected to the first pin of the 555 timer. The first pin of the 555 timer is grounded.

2. The infrared transmitting device based on PLC power line carrier technology according to claim 1, characterized in that: The current-limiting infrared LED light group includes a first current-limiting resistor R1, the first end of which is electrically connected to the output terminal of the power supply and the first end of a second current-limiting resistor R2. The second end of the first current-limiting resistor R1 is electrically connected to the first end of a first infrared LED1. The second end of the second current-limiting resistor R2 is electrically connected to the first end of a second infrared LED2. The second end of the second infrared LED2 is electrically connected to the second end of the first infrared LED1. The second end of the first infrared LED1 is electrically connected to the second end of an electrolytic capacitor C1. The first end of the second current-limiting resistor R2 is electrically connected to the first end of a third current-limiting resistor R3. The second end of the third current-limiting resistor R3 is electrically connected to the first end of a third infrared LED3. The second end of the third infrared LED3 is grounded.

3. The infrared transmitting device based on PLC power line carrier technology according to claim 2, characterized in that: The electrolytic capacitor C1, the first current-limiting resistor R1, the second current-limiting resistor R2, and the third current-limiting resistor R3 constitute a power supply filter circuit, which is used to filter out the voltage ripple of the power supply output.

4. The infrared transmitting device based on PLC power line carrier technology according to claim 1, characterized in that: The sixth current-limiting resistor R6 has a resistance of 1KΩ, the pull-down resistor R5 has a resistance of 10KΩ, the GPIO port is used for modulation signals, and the sixth current-limiting resistor R6, the pull-down resistor R5, the GPIO port and the MOSFET Q2 constitute a driving circuit. The sixth current-limiting resistor R6 is used to limit the current and protect the GPIO port.

5. The infrared transmitting device based on PLC power line carrier technology according to claim 1, characterized in that: The MOSFET Q2 is a control switch used to control the conduction and cutoff of the third infrared LED 3. The GPIO port of the microcontroller is used to send GPIO control signals to the gate of the MOSFET Q2.

6. The infrared transmitting device based on PLC power line carrier technology according to claim 1, characterized in that: The pull-down resistor R5 is used to turn off the MOSFET Q2 when there is no signal input.

7. The infrared transmitting device based on PLC power line carrier technology according to claim 1, characterized in that: The 555 timer, frequency generating resistor R8, and frequency generating capacitor C2 constitute a multivibrator, which is used to generate a 38kHz carrier signal.

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