An infrared alarm signal transmission system based on a power bus

Abstract

This invention proposes an infrared alarm signal transmission system based on a power bus, comprising an infrared transmitting unit, an infrared receiving unit, a power bus, and a host. The input terminal of the infrared transmitting unit is connected to the input terminal of the infrared receiver head HR1, and the output terminal of the infrared receiver head HR1 is connected to the power bus and the input terminal of the first signal processing circuit, respectively. The power indicator LED1 is connected in parallel to the power bus, and the display mode changes according to the carrier state of the power bus. This completely eliminates the need for a dedicated signal line between the infrared receiving unit and the alarm host, and only the power bus that powers the infrared receiving unit is needed to simultaneously complete the bidirectional transmission of power supply and status signals. By loading a first frequency signal and a second frequency signal representing different states onto the power bus, the system has strong anti-interference capability and accurate signal recognition. At the same time, the second signal processing circuit is set up to effectively prevent the false triggering of the first processing circuit under normal signal conditions, further improving the reliability of status judgment.

Description

Technical Field

[0001] This utility model relates to the field of security technology, and more specifically, to an infrared alarm signal transmission system based on a power bus. Background Technology

[0002] Infrared alarm systems are widely used in the security field, especially in perimeter security and door / window intrusion detection, due to their advantages such as non-contact operation, good concealment, and moderate cost. Traditional infrared alarm systems typically consist of an infrared transmitter, an infrared receiver, and an alarm control panel. In common implementations, the infrared receiver, upon detecting that the infrared beam is blocked (i.e., in an alarm state) or receiving the beam normally, needs to transmit its status signal (normal / alarm) to the alarm control panel for processing and response.

[0003] The closest existing technology, authorized by announcement number CN205247537U, discloses an intelligent infrared alarm device, which includes: a power supply, a keyboard, an LCD display device, a microcontroller, a carrier wave generator, a modulation device, an infrared transmitter, an infrared receiver, a demodulation device, and an alarm device. The power supply, keyboard, LCD display device, modulation device, demodulation device, and alarm device are respectively connected to the microcontroller. The carrier wave generator is connected to the modulation device, the modulation device is connected to the infrared transmitter, and the infrared receiver is connected to the demodulation device.

[0004] Existing alarms rely on encrypted communication using random numbers, but infrared signals are easily blocked by ambient light and strong electromagnetic interference, leading to communication interruptions or false alarms. Furthermore, they require a microcontroller to generate digital signals, increasing the cost of program development, chip computing power, and peripheral circuits.

[0005] Therefore, existing infrared alarm systems urgently need a technical solution that can simplify wiring, reduce costs, improve reliability, and is particularly suitable for simple status signal transmission. Utility Model Content

[0006] The purpose of this invention is to propose a highly reliable, simple, and low-cost infrared alarm signal transmission system based on a power bus.

[0007] An infrared alarm signal transmission system based on a power bus is characterized by comprising an infrared transmitting unit, an infrared receiving unit, a power bus, and a main unit. The output terminal of the infrared transmitting unit is connected to the input terminal of the infrared receiving unit, and the output terminal of the infrared receiving unit is connected to the main unit via the power bus. An infrared transmitting unit is used to generate a first frequency signal; an infrared receiving unit is used to detect the infrared signal status and control the power bus to output an alarm signal; the infrared receiving unit includes a power supply interface JP2, an infrared receiver head HR1, a first signal processing circuit, and a power indicator LED1. The power supply interface JP2 provides operating voltage for the infrared receiver head HR1, the first signal processing circuit, and the power indicator LED1. The input terminal of the infrared transmitting unit is connected to the input terminal of the infrared receiver head HR1, and the output terminal of the infrared receiver head HR1 is connected to the power bus and the input terminal of the first signal processing circuit, respectively. The power indicator LED1 is connected in parallel to the power bus. The display mode changes according to the carrier state of the power bus. When the infrared receiver head HR1 receives a valid signal output by the transmitting unit, the power bus is loaded with the first frequency signal, and the power indicator LED1 remains constantly lit without flashing; when the infrared receiver head HR1 does not receive a valid signal output by the transmitting unit, the first signal processing circuit generates a second frequency signal to drive the power bus, and the power indicator LED1 enters a flashing state.

[0008] Furthermore, the infrared receiver HR1 is also connected to a second signal processing circuit. The second signal processing circuit is used to generate a signal with a frequency greater than that of the first signal processing circuit. When the infrared receiver receives a valid signal output by the transmitting unit, it prevents the first processing unit from falsely triggering an alarm signal.

[0009] In some implementations, the first frequency signal is a DC equivalent waveform of 300Hz; the second frequency signal is a low-frequency oscillation waveform of 2.36Hz.

[0010] In some embodiments, the infrared transmitting unit includes a power supply interface JP1, a carrier oscillation circuit, a modulation wave circuit, and an infrared emitting tube D2; the power supply interface JP1 is connected to the carrier oscillation circuit, the modulation wave circuit, and the infrared emitting tube D2, and the power supply interface JP1 provides operating voltage to the carrier oscillation circuit, the modulation wave circuit, and the infrared emitting tube D2; the carrier oscillation circuit generates a carrier signal; the modulation wave circuit generates a modulation signal through a second RC network; and the infrared emitting tube D2 transmits the modulation signal generated by the modulation wave circuit to the infrared receiving unit through the carrier signal.

[0011] In some embodiments, the carrier oscillation circuit includes: a first comparator U1A; a resistor R2, one end of which is connected to the output terminal of the first comparator U1A; a capacitor C2, one end of which is connected to the other end of the resistor R2 and the inverting input terminal of U1A, and the other end is grounded; a resistor R1, one end of which is connected to the power supply voltage VCC; a resistor R4, one end of which is connected to the other end of the resistor R1 and the non-inverting input terminal of the first comparator U1A, and the other end is grounded; wherein, the first comparator U1A charges and discharges the capacitor C2 through the resistor R2, and combined with the voltage divider threshold of the resistors R1 and R4, finally outputs a 38kHz square wave.

[0012] In some embodiments, the modulation wave circuit includes a second comparator U1B, a resistor R12, a capacitor C4, a resistor R13, and a resistor R14. The second comparator U1B has one end electrically connected to the output terminal of the second comparator U1B; one end of the capacitor C4 is connected to the other end of R12 and the inverting input terminal of the second comparator U1B, and the other end is grounded; one end of the resistor R13 is connected to the power supply voltage VCC; one end of the resistor R14 is connected to the other end of the resistor R13 and the non-inverting input terminal of the second comparator U1B, and the other end is grounded. The voltage divider network formed by the resistors R13 and R14 generates a threshold voltage at the non-inverting input terminal of the second comparator U1B, and the output terminal of the second comparator U1B periodically charges and discharges the capacitor C4 through the resistor R12, triggering the second comparator U1B to flip and generate a modulated square wave with a frequency of 300Hz at the output terminal.

[0013] In some embodiments, the first signal processing circuit includes a diode D8, an operational amplifier U1C processing circuit, and an amplification and shaping circuit. Pin 1 of the infrared receiver head HR1 is connected to pin 2 of the diode D8, pin 3 of the diode D8 is connected to the input terminal of the amplification and shaping circuit, the output terminal of the amplification and shaping circuit is connected to the power supply interface JP2 through the power bus, and pin 1 of the diode D8 is connected to the operational amplifier U1C processing circuit.

[0014] In some implementations, the infrared emitting unit and the infrared receiving unit are arranged on the same plane to form an infrared beam-through structure.

[0015] In some implementations, the first comparator U1A, the second comparator U1B, the operational amplifier U1C, the third comparator U1C used in the processing circuit, and the fourth comparator U1D used in the second signal processing circuit are all of the LM393DR2G specification.

[0016] The beneficial effects of this utility model are as follows: This utility model proposes an infrared alarm signal transmission system based on a power bus, including an infrared transmitting unit, an infrared receiving unit, a power bus, and a host. The input end of the infrared transmitting unit is connected to the input end of the infrared receiver head HR1, and the output end of the infrared receiver head HR1 is connected to the power bus and the input end of the first signal processing circuit, respectively. The power indicator LED1 is connected in parallel on the power bus, and the display mode changes according to the carrier state of the power bus. This completely eliminates the need for a dedicated signal line between the infrared receiving unit and the alarm host. Only the power bus that powers the infrared receiving unit is needed to simultaneously complete the bidirectional transmission of power supply and status signals (normal / alarm). By loading a first frequency signal (e.g., 300Hz, constantly lit) and a second frequency signal (e.g., 2.36Hz, flashing) representing different states onto the power bus, the system has strong anti-interference ability and accurate signal recognition. At the same time, the second signal processing circuit is set up to effectively prevent the false triggering of the first processing circuit under normal signal conditions, further improving the reliability of status judgment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the circuit structure of the infrared transmitting unit of the infrared alarm signal transmission system based on the power bus of this application.

[0018] Figure 2 This is a schematic diagram of the circuit structure of the infrared receiving unit, power bus, and host of the infrared alarm signal transmission system based on the power bus of this application.

[0019] Figure 3 This is a schematic diagram of the circuit structure of the infrared receiver HR1, the first signal processing circuit, and the second signal processing circuit of the infrared alarm signal transmission system based on the power bus of this application.

[0020] Figure 4 This is a schematic diagram of the amplification and shaping circuit of the infrared alarm signal transmission system based on the power bus of this application.

[0021] Figure 5 This is a schematic diagram of the circuit structure connecting the power supply interface JP2, the power supply bus, and the power indicator LED1 of the infrared alarm signal transmission system based on the power supply bus of this application.

[0022] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0023] The following embodiments are described to aid in understanding this application. These embodiments are not, and should not be, construed in any way as limiting the scope of protection of this application.

[0024] In the following description, those skilled in the art will recognize that throughout this discussion, components may be described as individual functional units (which may include subunits), but those skilled in the art will recognize that various components or portions thereof may be divided into individual components or may be integrated together (including integrated within a single system or component).

[0025] Furthermore, the connection between components or systems is not intended to be limited to a direct connection; on the contrary, data between these components may be modified, reformatted, or otherwise altered by intermediate components. Additionally, other or fewer connections may be used. It should also be noted that the terms "connection," "link," or "input" should be understood to include direct connections, indirect connections via one or more intermediate devices, and wireless connections. Example 1:

[0026] like Figure 1 The diagram shown is a schematic diagram of the circuit structure of the infrared transmitting unit of the infrared alarm signal transmission system based on the power bus of this application; as shown... Figure 2 The diagram shown is a schematic representation of the circuit structure of the infrared receiving unit, power bus, and host of the infrared alarm signal transmission system based on the power bus of this application; Figure 3 The diagram shown is a schematic representation of the circuit structure of the infrared receiver HR1, the first signal processing circuit, and the second signal processing circuit of the infrared alarm signal transmission system based on the power bus of this application; Figure 4 The diagram shown is a schematic diagram of the amplification and shaping circuit of the infrared alarm signal transmission system based on the power bus of this application; as shown... Figure 5 The diagram shown is a schematic diagram of the circuit structure connecting the power supply interface JP2, the power supply bus, and the power indicator LED1 of the infrared alarm signal transmission system based on the power supply bus of this application.

[0027] An infrared alarm signal transmission system based on a power bus is characterized by comprising an infrared transmitting unit, an infrared receiving unit, a power bus, and a main unit. The output terminal of the infrared transmitting unit is connected to the input terminal of the infrared receiving unit, and the output terminal of the infrared receiving unit is connected to the main unit via the power bus. An infrared transmitting unit is used to generate a first frequency signal; an infrared receiving unit is used to detect the infrared signal status and control the power bus to output an alarm signal; the infrared receiving unit includes a power supply interface JP2, an infrared receiver head HR1, a first signal processing circuit, and a power indicator LED1. The power supply interface JP2 provides operating voltage for the infrared receiver head HR1, the first signal processing circuit, and the power indicator LED1. The input terminal of the infrared transmitting unit is connected to the input terminal of the infrared receiver head HR1, and the output terminal of the infrared receiver head HR1 is connected to the power bus and the input terminal of the first signal processing circuit, respectively. The power indicator LED1 is connected in parallel to the power bus. The display mode changes according to the carrier state of the power bus. When the infrared receiver head HR1 receives a valid signal output by the transmitting unit, the power bus is loaded with the first frequency signal, and the power indicator LED1 remains constantly lit without flashing; when the infrared receiver head HR1 does not receive a valid signal output by the transmitting unit, the first signal processing circuit generates a second frequency signal to drive the power bus, and the power indicator LED1 enters a flashing state.

[0028] The infrared receiver head HR1 is also connected to a second signal processing circuit. The second signal processing circuit is used to generate a signal with a frequency greater than that of the first signal processing circuit. When the infrared receiver head receives a valid signal output by the transmitting unit, it prevents the first processing unit from falsely triggering an alarm signal.

[0029] The first frequency signal is a DC equivalent waveform of 300Hz; the second frequency signal is a low-frequency oscillation waveform of 2.36Hz.

[0030] The infrared transmitting unit includes a power supply interface JP1, a carrier oscillation circuit, a modulation wave circuit, and an infrared emitting tube D2. The power supply interface JP1 is connected to the carrier oscillation circuit, the modulation wave circuit, and the infrared emitting tube D2, and provides operating voltage to the carrier oscillation circuit, the modulation wave circuit, and the infrared emitting tube D2. The carrier oscillation circuit generates a carrier signal. The modulation wave circuit generates a modulation signal through a second RC network. The infrared emitting tube D2 transmits the modulation signal generated by the modulation wave circuit to the infrared receiving unit through the carrier signal.

[0031] The carrier oscillation circuit includes: a first comparator U1A; a resistor R2, one end of which is connected to the output terminal of the first comparator U1A; a capacitor C2, one end of which is connected to the other end of the resistor R2 and the inverting input terminal of U1A, and the other end is grounded; a resistor R1, one end of which is connected to the power supply voltage VCC; a resistor R4, one end of which is connected to the other end of the resistor R1 and the non-inverting input terminal of the first comparator U1A, and the other end is grounded; wherein, the first comparator U1A charges and discharges the capacitor C2 through the resistor R2, and combined with the voltage division threshold of the resistors R1 and R4, it finally outputs a 38kHz square wave.

[0032] The modulation wave circuit includes a second comparator U1B, a resistor R12, a capacitor C4, a resistor R13, and a resistor R14. The second comparator U1B is connected to the output of the second comparator U1B at one end. The capacitor C4 is connected to the inverting input of the second comparator U1B at one end, and grounded at the other end. The resistor R13 is connected to the power supply voltage VCC at one end. The resistor R14 is connected to the non-inverting input of the second comparator U1B at one end, and grounded at the other end. The voltage divider network formed by the resistors R13 and R14 generates a threshold voltage at the non-inverting input of the second comparator U1B. The output of the second comparator U1B periodically charges and discharges the capacitor C4 through the resistor R12, triggering the second comparator U1B to flip and generate a modulated square wave with a frequency of 300Hz at its output.

[0033] The first signal processing circuit includes diode D8, operational amplifier U1C processing circuit, and amplification and shaping circuit. Pin 1 of infrared receiver head HR1 is connected to pin 2 of diode D8, pin 3 of diode D8 is connected to the input terminal of amplification and shaping circuit, the output terminal of amplification and shaping circuit is connected to power supply interface JP2 through power bus, and pin 1 of diode D8 is connected to operational amplifier U1C processing circuit.

[0034] The infrared emitting unit and the infrared receiving unit are arranged on the same plane to form an infrared beam-through structure.

[0035] The first comparator U1A, the second comparator U1B, the operational amplifier U1C, the third comparator U1C used in the processing circuit, and the fourth comparator U1D used in the second signal processing circuit are all LM393DR2G.

[0036] The beneficial effects of this utility model are as follows: This utility model proposes an infrared alarm signal transmission system based on a power bus, including an infrared transmitting unit, an infrared receiving unit, a power bus, and a host. The input end of the infrared transmitting unit is connected to the input end of the infrared receiver head HR1, and the output end of the infrared receiver head HR1 is connected to the power bus and the input end of the first signal processing circuit, respectively. The power indicator LED1 is connected in parallel on the power bus, and the display mode changes according to the carrier state of the power bus. This completely eliminates the need for a dedicated signal line between the infrared receiving unit and the alarm host. Only the power bus that powers the infrared receiving unit is needed to simultaneously complete the bidirectional transmission of power supply and status signals (normal / alarm). By loading a first frequency signal (e.g., 300Hz, constantly lit) and a second frequency signal (e.g., 2.36Hz, flashing) representing different states onto the power bus, the system has strong anti-interference ability and accurate signal recognition. At the same time, the second signal processing circuit is set up to effectively prevent the false triggering of the first processing circuit under normal signal conditions, further improving the reliability of status judgment.

[0037] Although this application discloses several aspects and embodiments, other aspects and embodiments will be obvious to those skilled in the art. Various modifications and improvements can be made without departing from the concept of this application, and these all fall within the scope of protection of this application. The various aspects and embodiments disclosed in this application are for illustrative purposes only and are not intended to limit this application. The actual scope of protection of this application is determined by the claims.

Claims

1. A power bus based infrared alarm signal transmission system, characterized in that, The system includes an infrared transmitting unit, an infrared receiving unit, a power bus, and a main unit. The output of the infrared transmitting unit is connected to the input of the infrared receiving unit, and the output of the infrared receiving unit is connected to the main unit via the power bus. The infrared transmitting unit generates a first frequency signal; the infrared receiving unit detects the infrared signal status and controls the power bus to output an alarm signal. The infrared receiving unit includes a power supply interface JP2, an infrared receiver head HR1, a first signal processing circuit, and a power indicator LED1. The power supply interface JP2 provides operating voltage for the infrared receiver head HR1, the first signal processing circuit, and the power indicator LED1. The input of the infrared transmitting unit is connected to the input of the infrared receiver head HR1, and the output of the infrared receiver head HR1 is connected to the power bus and the input of the first signal processing circuit, respectively. The power indicator LED1 is connected in parallel to the power bus. The display mode changes according to the carrier state of the power bus. When the infrared receiver head HR1 receives a valid signal output by the transmitting unit, the power bus is loaded with the first frequency signal, and the power indicator LED1 remains constantly lit without flashing. When the infrared receiver head HR1 does not receive a valid signal output by the transmitting unit, the first signal processing circuit generates a second frequency signal to drive the power bus, and the power indicator LED1 enters a flashing state.

2. The infrared alarm signal transmission system based on the power bus as described in claim 1, characterized in that: The infrared receiver head HR1 is also connected to a second signal processing circuit. The second signal processing circuit is used to generate a signal with a frequency greater than that of the first signal processing circuit. When the infrared receiver head receives a valid signal output by the transmitting unit, it prevents the first processing unit from falsely triggering an alarm signal.

3. The infrared alarm signal transmission system based on the power bus as described in claim 1, characterized in that: The first frequency signal is a DC equivalent waveform of 300Hz; the second frequency signal is a low-frequency oscillation waveform of 2.36Hz.

4. The infrared alarm signal transmission system based on the power bus as described in claim 1, characterized in that: The infrared transmitting unit includes a power supply interface JP1, a carrier oscillation circuit, a modulation wave circuit, and an infrared emitting tube D2. The power supply interface JP1 is connected to the carrier oscillation circuit, the modulation wave circuit, and the infrared emitting tube D2, and provides operating voltage to the carrier oscillation circuit, the modulation wave circuit, and the infrared emitting tube D2. The carrier oscillation circuit generates a carrier signal. The modulation wave circuit generates a modulation signal through a second RC network. The infrared emitting tube D2 transmits the modulation signal generated by the modulation wave circuit to the infrared receiving unit through the carrier signal.

5. The infrared alarm signal transmission system based on the power bus as described in claim 4, characterized in that: The carrier oscillation circuit includes: a first comparator U1A; a resistor R2, one end of which is connected to the output terminal of the first comparator U1A; a capacitor C2, one end of which is connected to the other end of the resistor R2 and the inverting input terminal of U1A, and the other end is grounded; a resistor R1, one end of which is connected to the power supply voltage VCC; and a resistor R4, one end of which is connected to the other end of the resistor R1 and the non-inverting input terminal of the first comparator U1A, and the other end is grounded.

6. The infrared alarm signal transmission system based on the power bus as described in claim 4, characterized in that: The modulation wave circuit includes a second comparator U1B, a resistor R12, a capacitor C4, a resistor R13, and a resistor R14. The second comparator U1B is connected to the output terminal of the second comparator U1B, with one end of the resistor R12 electrically connected to the output terminal of the second comparator U1B. The capacitor C4 is connected to the other end of the resistor R12 and the inverting input terminal of the second comparator U1B, and the other end is grounded. The resistor R13 is connected to the power supply voltage VCC, and the resistor R14 is connected to the other end of the resistor R13 and the non-inverting input terminal of the second comparator U1B, and the other end is grounded.

7. The infrared alarm signal transmission system based on the power bus as described in claim 1, characterized in that: The first signal processing circuit includes diode D8, operational amplifier U1C processing circuit, and amplification and shaping circuit. Pin 1 of infrared receiver head HR1 is connected to pin 2 of diode D8, pin 3 of diode D8 is connected to the input terminal of amplification and shaping circuit, the output terminal of amplification and shaping circuit is connected to power supply interface JP2 through power bus, and pin 1 of diode D8 is connected to operational amplifier U1C processing circuit.

8. The infrared alarm signal transmission system based on the power bus as described in claim 1, characterized in that: The infrared emitting unit and the infrared receiving unit are arranged on the same plane to form an infrared beam-through structure.

9. The infrared alarm signal transmission system based on the power bus as described in claim 1, characterized in that: The first comparator U1A, the second comparator U1B, the operational amplifier U1C, the third comparator U1C used in the processing circuit, and the fourth comparator U1D used in the second signal processing circuit are all LM393DR2G.

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