An infrared remote control circuit

Abstract

The utility model discloses an infrared remote control circuit, including infrared emission circuit, infrared receiving circuit and signal processor, and emission circuit contains drive module and a plurality of infrared emission tube branch, and drive module contains MOS pipe, triode and first to third resistance, first electric capacity: MOS pipe connects triode collector and emission tube branch respectively, and first resistance both ends connect MOS pipe, and first electric capacity parallels with it, and second resistance connects triode base, and third resistance both ends connect triode. Emission tube branch contains infrared emission tube and current -limiting resistance each, and current -limiting resistance connects emission tube anode, and emission tube cathode connects ground. Receiving circuit includes infrared receiving module, and parallel filter resistance and filter electric capacity: receiving module output end exports signal. Processor handles signal and controls emission, and its first pin connects triode, and second pin connects receiving module. The utility model passes through a plurality of infrared emission tube branch, and under single emission tube does not exceed rated current, promotes emission power to increase remote control distance.

Description

Technical Field

[0001] This utility model relates to, but is not limited to, the field of electronic technology, and in particular to an infrared remote control circuit. Background Technology

[0002] In existing infrared remote control circuits, the infrared emitting section often uses a single infrared emitting diode, or, when omnidirectional coverage is required, only a single infrared emitting diode is configured in each direction. Since the remote control distance of an infrared emitting diode mainly depends on its operating current, and the operating current has a rated upper limit, increasing the current to improve the distance will lead to accelerated light decay of the emitting diode and significantly shorten its lifespan. Therefore, with the performance of the infrared receiving equipment fixed, the remote control distance of existing infrared remote control circuits has a clear upper limit. Utility Model Content

[0003] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims. This invention aims to at least solve one of the technical problems existing in the prior art. To this end, embodiments of this invention provide an infrared remote control circuit that, through multiple infrared emitting diode branches, increases the transmission power of a single emitting diode without exceeding its rated current, thereby increasing the remote control distance.

[0004] This utility model embodiment provides an infrared remote control circuit, including: an infrared emitting circuit, comprising a driving module and multiple infrared emitting diode branches. The driving module includes a MOSFET and a transistor. The gate of the MOSFET is connected to the collector of the transistor, and the drain of the MOSFET is connected to the multiple infrared emitting diode branches. Each infrared emitting diode branch includes an infrared emitting diode and a current-limiting resistor. The current-limiting resistor is connected to the positive terminal of the infrared emitting diode, and the negative terminal of the infrared emitting diode is grounded. The driving module further includes a first resistor, a second resistor, a third resistor, and a first capacitor. The two ends of the first resistor are respectively connected to the gate and source of the MOSFET. The second resistor is connected to the base of the transistor. The two ends of the third resistor are respectively connected to the base and emitter of the transistor. The first capacitor is connected to the... A resistor is connected in parallel; an infrared receiving circuit includes an infrared receiving module, a filter resistor, and a filter capacitor. The infrared receiving module is connected to the filter resistor and the filter capacitor respectively. The output terminal of the infrared receiving module is used to output an infrared received signal. The filter resistor includes a fourth resistor and a fifth resistor. The filter capacitor includes a second capacitor and a third capacitor. The fourth resistor is connected in parallel with the second capacitor, and the fifth resistor is connected in parallel with the third capacitor. The second capacitor and the third capacitor are grounded. The fourth resistor and the fifth resistor are connected to a power supply terminal. A signal processor is used to process the infrared received signal and control the signal transmission of the infrared transmitting circuit. The signal processor has a first pin and a second pin. The first pin is connected to the base of the transistor, and the second pin is connected to the output terminal of the infrared receiving module.

[0005] According to some embodiments of this utility model, the signal processor is connected to the power supply.

[0006] According to some embodiments of this utility model, the source of the transistor is connected to the power supply terminal.

[0007] According to some embodiments of the present invention, the signal processor has a built-in signal learning module, which is used to learn and store infrared signals.

[0008] According to some embodiments of the present invention, the signal processor includes a wired communication interface and / or a wireless communication interface.

[0009] According to some embodiments of the present invention, the signal processor includes a wired communication interface, which includes at least one of RS485, CAN, Ethernet, RS232 and USB.

[0010] According to some embodiments of the present invention, the signal processor includes a wireless communication interface, which includes at least one of Wi-Fi, Bluetooth, Zigbee, 2.4G, LoRa, NB-IoT, and 4G.

[0011] This utility model embodiment has at least the following beneficial effects: By setting multiple infrared emitting tube branches, the overall infrared emission power can be improved through the synergistic effect of multiple branches of emitting tubes, effectively increasing the remote control distance, provided that the operating current of a single infrared emitting tube does not exceed its rated upper limit. Simultaneously, it avoids the light decay problem caused by a single emitting tube operating with high current, extending the lifespan of the emitting tube. Furthermore, the reasonable configuration of resistors and capacitors in the drive module ensures the stability of the circuit operation, further improving the reliability of infrared remote control.

[0012] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0013] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.

[0014] Figure 1 This is a schematic diagram of an infrared remote control circuit provided in one embodiment of the present invention; Figure 2 This is a schematic diagram of an infrared emitting circuit provided in one embodiment of the present invention; Figure 3 This is a schematic diagram of an infrared receiving circuit provided in one embodiment of the present invention. Detailed Implementation

[0015] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein 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 this utility model, and should not be construed as limiting this utility model.

[0016] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features or the order of the technical features.

[0018] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0019] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0020] See Figure 1 , Figure 1 This is a schematic diagram of an infrared remote control circuit according to one embodiment of the present invention. The infrared remote control circuit includes an infrared transmitting circuit, an infrared receiving circuit, and a low-power signal processor (MCU), which work together to realize the transmission, reception, and processing control of infrared signals.

[0021] like Figure 2 As shown, the infrared emitting circuit includes a driving module and multiple infrared emitting diode branches. The driving module includes a MOSFET and a transistor. The gate of the MOSFET is connected to the collector of the transistor, and the drain of the MOSFET is connected to multiple infrared emitting diode branches. Each infrared emitting diode branch includes an infrared emitting diode and a current-limiting resistor. The current-limiting resistor is connected to the positive terminal of the infrared emitting diode, and the negative terminal of the infrared emitting diode is grounded. Further, the driving module also includes a first resistor R1, a second resistor R2, a third resistor R3, and a first capacitor C1. The two ends of the first resistor R1 are connected to the gate and source of the MOSFET, respectively. The second resistor R2 is connected to the base of the transistor, and the two ends of the third resistor R3 are connected to the base and emitter of the transistor, respectively. The first capacitor C1 is connected in parallel with the first resistor R1.

[0022] like Figure 3As shown, the infrared receiving circuit includes an infrared receiving module, a filter resistor, and a filter capacitor. The infrared receiving module is connected to both the filter resistor and the filter capacitor. The output terminal of the infrared receiving module is used to output the infrared received signal. Further, the filter resistor includes a fourth resistor R4 and a fifth resistor R5, and the filter capacitor includes a second capacitor C8 and a third capacitor C9. The fourth resistor R4 is connected in parallel with the second capacitor C8, and the fifth resistor R5 is connected in parallel with the third capacitor C9. The second capacitor C8 and the third capacitor C9 are grounded, and the fourth resistor R4 and the fifth resistor R5 are connected to the power supply terminal.

[0023] The signal processor is used to process infrared received signals and control the signal transmission of the infrared transmitting circuit. The signal processor has a first pin (control pin) and a second pin. The first pin is connected to the base of the transistor, and the second pin is connected to the output terminal of the infrared receiving module.

[0024] Specifically, the first pin is connected to the transmission interface IR_TXD, which is connected to the base of the transistor. The infrared control signal is output through IR_TXD to drive the infrared emitting diode. The current-limiting resistors (R24 to R29) in each infrared emitting diode branch are for the corresponding branch's infrared emitting diode. Adjusting these resistor parameters allows for adjustment of the transmission power and thus the remote control distance. D3 to D8 are the infrared emitting diodes. When laying them out on the PCB, they can be arranged in the same direction, in different directions, or at a certain angle to increase the remote control range. The output of the infrared receiving module is connected to the second pin of the signal processor via the transmission interface IR_RXD to transmit the received infrared signal to the signal processor for processing.

[0025] This infrared remote control circuit addresses the issue that the remote control distance is insufficient when a single infrared emitter's current is adjusted to its maximum allowable value. Multiple infrared emitters (such as multiple infrared LEDs) can be connected in parallel and controlled by the same driver and control signal. This results in a superposition effect of light intensity, significantly extending the remote control distance. The specific number of LEDs can be increased as needed. In one feasible embodiment, the signal processor is connected to the power supply, and the source of the transistor is also connected to the power supply.

[0026] In one feasible embodiment, the signal processor has a built-in signal learning module. The module's normal operating principle is as follows: it receives external infrared signals to be learned through the infrared receiving circuit (including an infrared receiver head, filtering circuit, and signal amplification unit, etc.) integrated into the module. After the original signal is processed by the circuit to remove noise interference, it enters the core processing unit of the module for a series of processing such as parsing and encoding. Finally, the processed signal data is stored in the module's internal storage unit. When it is necessary to transmit the infrared signal to the target device, the module directly retrieves the pre-stored signal data from the storage unit. After digital-to-analog conversion and signal driving circuit amplification, the signal is transmitted through the infrared transmitting circuit (including an infrared emitting tube and a matching driving chip, etc.) according to the original characteristic parameters, thereby completing the remote control operation of the device.

[0027] In practical applications, the signal learning module can adopt differentiated adaptation strategies for different types of remote control devices. For example, for conventional remote control devices (such as certain major brand home appliances and electronic devices on the market), since their infrared remote control protocols have formed standardized specifications, the signal learning module has a pre-set standard signal library. This library contains the characteristic data of common remote control command parameters (such as power on / off, function adjustment, etc.) for these brands of devices. No additional learning is required; users can directly call the corresponding signal parameters from the standard library by matching the device model or selecting the function, quickly achieving accurate remote control of these devices. However, for some niche brand devices or customized devices, because they are not included in the standard signal library… In situations where there is no standardized remote control protocol, the module can activate its self-learning mode. Specifically, the user can point the signal processor's infrared receiver circuit at the transmitter of the original remote control. After triggering the learning command, the specific infrared signal emitted by the original remote control will be fully received. The module comprehensively collects and analyzes the signal's carrier frequency, pulse timing, encoding rules, and other characteristics. The learned complete signal feature data is then stored in the module's non-volatile register. In subsequent use, the module retrieves the signal data stored in the register and emits a consistent infrared signal with the same characteristic parameters through the infrared transmitter, thus achieving the same remote control function as the original remote control for this niche brand device.

[0028] In one feasible embodiment, the signal processor includes a wired communication interface and / or a wireless communication interface.

[0029] In one feasible embodiment, the wired communication interface includes at least one of RS485, CAN, Ethernet, RS232 and USB.

[0030] In one feasible embodiment, the wireless communication interface includes at least one of Wi-Fi, Bluetooth, Zigbee, 2.4G, LoRa, NB-IoT, and 4G.

[0031] It should be noted that the low-power signal processor (MCU) can be a conventional low-power MCU, such as the STM32L series. It can work in conjunction with the infrared transmitting and receiving circuits. By setting up multiple infrared emitting diode branches, the overall infrared transmission power can be increased through the synergistic effect of multiple branches, while ensuring that the operating current of a single infrared emitting diode does not exceed its rated limit. This effectively increases the remote control distance and avoids the light decay problem caused by high current operation of a single emitting diode, extending the lifespan of the emitting diode. Furthermore, the configuration of resistors and capacitors in the driver module ensures the stability and reliability of the circuit operation. The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of the present utility model.

Claims

1. An infrared remote control circuit, characterized in that, include: An infrared emitting circuit includes a driving module and multiple infrared emitting diode branches. The driving module includes a MOSFET and a transistor. The gate of the MOSFET is connected to the collector of the transistor, and the drain of the MOSFET is connected to the multiple infrared emitting diode branches. Each infrared emitting diode branch includes an infrared emitting diode and a current-limiting resistor. The current-limiting resistor is connected to the positive terminal of the infrared emitting diode, and the negative terminal of the infrared emitting diode is grounded. The driving module also includes a first resistor, a second resistor, a third resistor, and a first capacitor. The two ends of the first resistor are connected to the gate and source of the MOSFET, respectively. The second resistor is connected to the base of the transistor. The two ends of the third resistor are connected to the base and emitter of the transistor, respectively. The first capacitor is connected in parallel with the first resistor. An infrared receiving circuit includes an infrared receiving module, a filter resistor, and a filter capacitor. The infrared receiving module is connected to the filter resistor and the filter capacitor respectively. The output terminal of the infrared receiving module is used to output an infrared received signal. The filter resistor includes a fourth resistor and a fifth resistor, the filter capacitor includes a second capacitor and a third capacitor, the fourth resistor is connected in parallel with the second capacitor, the fifth resistor is connected in parallel with the third capacitor, the second capacitor and the third capacitor are grounded, and the fourth resistor and the fifth resistor are connected to the power supply terminal. A signal processor is used to process infrared received signals and control the signal transmission of the infrared transmitting circuit; the signal processor has a first pin and a second pin, the first pin is connected to the base of the transistor, and the second pin is connected to the output terminal of the infrared receiving module.

2. The infrared remote control circuit according to claim 1, characterized in that, The signal processor is connected to the power supply.

3. The infrared remote control circuit according to claim 2, characterized in that, The source of the transistor is connected to the power supply terminal.

4. The infrared remote control circuit according to claim 1, characterized in that, The signal processor has a built-in signal learning module, which is used to learn and store infrared signals.

5. The infrared remote control circuit according to claim 1, characterized in that, The signal processor includes a wired communication interface and / or a wireless communication interface.

6. The infrared remote control circuit according to claim 5, characterized in that, The signal processor includes a wired communication interface, which includes at least one of RS485, CAN, Ethernet, RS232 and USB.

7. The infrared remote control circuit according to claim 5, characterized in that, The signal processor includes a wireless communication interface, which includes at least one of Wi-Fi, Bluetooth, Zigbee, 2.4G, LoRa, NB-IoT, and 4G.

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