A security reminding system

Abstract

The utility model relates to wireless communication technical field especially relates to a security protection reminding system, including transmitter and receiver, the transmitter includes first MCU circuit, wireless transmitting circuit and infrared induction circuit, the receiver includes second MCU circuit, wireless receiving circuit and voice reminding circuit, and wireless transmitting circuit includes CMT2119A type wireless transmitting chip, and wireless receiving circuit includes CMT2219A type wireless receiving chip. Visible, this security protection reminding system adopts CMT2119A type wireless transmitting chip and CMT2219A type wireless receiving chip that work in 433MHz frequency band to establish wireless communication, utilizes the advantage that this frequency band signal is strong, and the anti -interference ability is high, effectively promotes the wireless communication stability of security protection reminding system. Again in combination infrared induction circuit and voice reminding circuit, has realized accurate perception and efficient reminding, has promoted the overall performance and user experience of security protection monitoring.

Description

Technical Field

[0001] This utility model relates to the field of wireless communication technology, and in particular to a security alert system. Background Technology

[0002] A security monitoring system is a system used to monitor and protect the safety of people and property. Such a system typically includes monitoring equipment, control equipment, and alarm equipment. Monitoring equipment monitors changes in the surrounding environment in real time, while control equipment analyzes and judges whether there are any anomalies in the surrounding environment, such as unauthorized intrusions. Once an anomaly is confirmed, the alarm equipment will sound an alarm and take corresponding measures to ensure safety. Currently, security monitoring systems are widely used in various settings such as homes, commercial premises, and public places. However, traditional security monitoring systems often require extensive wiring to establish communication between monitoring, control, and alarm equipment, resulting in high installation and maintenance costs. Some security monitoring systems establish WiFi wireless communication between monitoring and control equipment to save on extensive wiring. However, the instability of WiFi signals often leads to monitoring delays and failures. Therefore, how to establish a stable wireless communication connection for security monitoring systems to achieve more reliable security monitoring is an urgent problem to be solved. Utility Model Content

[0003] In view of this, the present invention proposes a security reminder system, which aims to solve the problems of unstable wireless communication signals and the need to improve the reliability of security monitoring in existing security monitoring systems.

[0004] This utility model proposes a security alert system, including a transmitter and a receiver. The transmitter includes a first MCU circuit and a wireless transmitting circuit electrically connected to each other. The receiver includes a second MCU circuit and a wireless receiving circuit electrically connected to each other. The wireless transmitting circuit is also wirelessly connected to the wireless receiving circuit. The transmitter also includes an infrared sensing circuit electrically connected to the first MCU circuit. The receiver also includes a voice alert circuit electrically connected to the second MCU circuit. Both the first and second MCU circuits include an FT61E0A3-RB type microcontroller. The wireless transmitting circuit includes a CMT2119A type wireless transmitting chip. The wireless receiving circuit includes a CMT2219A type wireless receiving chip. The voice alert circuit includes a WTN6 type OTP voice chip. The infrared sensing circuit includes a D220AX type infrared sensor.

[0005] Furthermore, the first MCU circuit includes an FT61E0A3-RB type microcontroller U3, a phototransistor D10, a capacitor C23, a resistor R1, and a resistor R9; wherein, the first pin of the microcontroller U3 is connected to a 3.3V power supply terminal, the second pin of the microcontroller U3 is connected to the emitter of the phototransistor D10, one end of the capacitor C23, and one end of the resistor R1 respectively, the collector of the phototransistor D10 is connected to the 3.3V power supply terminal, the fourth pin of the microcontroller U3 is connected to the other end of the resistor R1 and one end of the resistor R9 respectively, the other ends of the capacitor C23 and the other ends of the resistor R9 are both grounded, and the 16th pin of the microcontroller U3 is grounded.

[0006] Furthermore, the wireless transmission circuit includes a CMT2119A type wireless transmission chip U2, a crystal oscillator X1, a resistor R5, a capacitor C0, an inductor L1, a capacitor C1, a resistor R4, an inductor L2, a capacitor C2, an inductor L3, a capacitor C3, an inductor L4, a capacitor C4, and an antenna ANT; wherein, the first pin of the wireless transmission chip U2 is grounded through the crystal oscillator X1, the second pin of the wireless transmission chip U2 is grounded, the third pin of the wireless transmission chip U2 is connected to the DATA1 terminal and one end of the resistor R5, the other end of the resistor R5 is connected to the DATA terminal, the fourth pin of the wireless transmission chip U2 is connected to the CLK1 terminal and one end of the resistor R4, the other end of the resistor R4 is connected to the DATA terminal, and the fourth pin of the wireless transmission chip U2 is connected to the CLK1 terminal and one end of the resistor R4, the other end of the resistor R4 is connected to the DATA terminal. Connecting to the CLK terminal, pin 5 of the wireless transmitter chip U2 is connected to one end of inductor L1 and one end of capacitor C1. The other end of inductor L1 is connected to the 3.3V power supply. The other end of capacitor C1 is connected to one end of inductor L2. The other end of inductor L2 is connected to one end of inductor L3 and one end of capacitor C2. The other end of inductor L3 is connected to one end of inductor L4 and one end of capacitor C3. The other end of inductor L4 is connected to one end of capacitor C4 and antenna ANT. The other ends of capacitors C2, C3, and C4 are all grounded. Pin 6 of the wireless transmitter chip U2 is connected to the 3.3V power supply and one end of capacitor C0. The other end of capacitor C0 is grounded.

[0007] Furthermore, the infrared sensing circuit includes a D220AX type infrared sensor PIR, an AS232-8A type serial interface chip U1, resistors R11 and R7, and capacitor C22. Pins 1 and 2 of the serial interface chip U1 are both connected to a 3.3V power supply. Pin 5 of the serial interface chip U1 is connected to the OUT terminal via resistor R11. Pin 6 of the serial interface chip U1 is connected to the SEN terminal via resistor R7 and grounded via capacitor C22. Pin 7 of the serial interface chip U1 is connected to pin 2 of the infrared sensor PIR. Pin 1 of the infrared sensor PIR is connected to the 3.3V power supply. Pin 8 of the serial interface chip U1 and pin 3 of the infrared sensor PIR are both grounded.

[0008] Furthermore, the transmitter also includes a first linear voltage regulator circuit and a second linear voltage regulator circuit, which are electrically connected to the first MCU circuit respectively.

[0009] The first linear regulator circuit includes an LN1152B332MR-G type voltage linear regulator chip U4, a capacitor C16, a resistor R2, a capacitor C15, and a capacitor C17. The first pin of the voltage linear regulator chip U4 is connected to the VCC terminal, one end of capacitor C16, and one end of resistor R2. The other end of resistor R2 is connected to the third pin of the voltage linear regulator chip U4. The fifth pin of the voltage linear regulator chip U4 is connected to the 3.3V power supply terminal, one end of capacitor C15, and one end of capacitor C17. The other end of capacitor C16, the second pin of the voltage linear regulator chip U4, the other end of capacitor C15, and the other end of capacitor C17 are all grounded.

[0010] The second linear regulator circuit includes an HT7133 type low dropout linear regulator chip U5, capacitors C18, C19, and C20; wherein, the third pin of the low dropout linear regulator chip U5 is connected to the VCC terminal and one end of capacitor C18, the second pin of the low dropout linear regulator chip U5 is connected to the 3.3V power supply terminal, one end of capacitor C19, and one end of capacitor C20, and the other end of capacitor C18, the first pin of the low dropout linear regulator chip U5, the other end of capacitor C19, and the other end of capacitor C20 are all grounded.

[0011] Furthermore, the wireless receiving circuit includes a CMT2219A type wireless receiving chip U2, inductor L2, antenna ANT, capacitor C4, inductor L3, inductor L4, capacitor C11, capacitor C0, capacitor C1, inductor L1, crystal oscillator X1, capacitor C2, and capacitor C3; wherein, pin 5 of the wireless receiving chip U2 is connected to the GP04 terminal, pin 7 of the wireless receiving chip U2 is connected to one end of crystal oscillator X1 and one end of capacitor C3, pin 8 of the wireless receiving chip U2 is connected to the other end of crystal oscillator X1 and one end of capacitor C2, the other end of capacitor C2, the other end of capacitor C3, and pin 13 of the wireless receiving chip U2 are all grounded, and pin 1 of the wireless receiving chip U2 is grounded. Pin 1 is connected to pin 12 of the wireless receiver chip U2 via inductor L2. Pin 14 of the wireless receiver chip U2 is connected to one end of capacitor C1 and one end of inductor L1. Pin 15 of the wireless receiver chip U2 is connected to the other end of inductor L1 and ground. Pin 16 of the wireless receiver chip U2 is connected to one end of capacitor C0 and the 3.3V power supply. The other end of capacitor C0 is grounded. The other end of capacitor C1 is connected to one end of capacitor C11, one end of inductor L3, and one end of inductor L4. The other ends of capacitor C11 and inductor L4 are both grounded. The other end of inductor L3 is connected to antenna ANT and one end of capacitor C4. The other end of capacitor C4 is grounded.

[0012] Furthermore, the voice reminder circuit includes a WTN6 type OTP voice chip U1, resistors R5 and R3, capacitors C5 and C10, connector J3, and connector J1. Specifically, pin 1 of the OTP voice chip U1 is connected to one end of resistor R5 and pin 4 of connector J3; pin 2 of the OTP voice chip U1 is connected to one end of resistor R3 and pin 3 of connector J3; the other end of resistor R5 is connected to the DATA terminal; the other end of resistor R3 is connected to the BUSY terminal; pin 3 of the OTP voice chip U1 is connected to pin 2 of connector J3; pin 4 of the OTP voice chip U1 is connected to pin 1 of connector J3; pin 5 of the OTP voice chip U1 is connected to pin 2 of connector J1; pin 7 of the OTP voice chip U1 is connected to pin 1 of connector J1; pin 6 of the OTP voice chip U1 is connected to one end of capacitor C5, one end of capacitor C10, and the VCC terminal; and pin 8 of the OTP voice chip U1 is connected to the other end of capacitor C5, the other end of capacitor C10, and the ground terminal.

[0013] Furthermore, the receiver also includes an LED driving circuit, which is electrically connected to the second MCU circuit. The LED driving circuit includes resistors R10 and R13, a 3400 / SOT23-3 type MOSFET Q1, a 3400 / SOT23-3 type MOSFET Q2, resistors R6, R7, R8, and R9. The source of MOSFET Q1 is connected to the source of MOSFET Q2, one end of resistor R10, and ground. The gate of MOSFET Q1 is connected to the gate of MOSFET Q2, one end of resistor R13, and the other end of resistor R10. The other end of resistor R13 is connected to the PWM terminal. The drain of MOSFET Q1 is connected to the drain of MOSFET Q2, one end of resistor R6, one end of resistor R7, one end of resistor R8, and one end of resistor R9. The other ends of resistors R6, R7, R8, and R9 are all connected to the LED terminal.

[0014] Furthermore, the receiver also includes a third linear voltage regulator circuit and a fourth linear voltage regulator circuit, which are electrically connected to the second MCU circuit respectively.

[0015] The third linear regulator circuit includes an LN1152B332MR-G type voltage linear regulator chip U7, capacitor C16, resistor R2, capacitor C15, and capacitor C17. Pin 1 of the voltage linear regulator chip U7 is connected to a 5V power supply terminal, one end of capacitor C16, and one end of resistor R2. The other end of resistor R2 is connected to pin 3 of the voltage linear regulator chip U7. Pin 5 of the voltage linear regulator chip U7 is connected to a 3.3V power supply terminal, one end of capacitor C15, and one end of capacitor C17. The other end of capacitor C16, pin 2 of the voltage linear regulator chip U7, the other end of capacitor C15, and the other end of capacitor C17 are all grounded.

[0016] The fourth linear regulator circuit includes a ZF7550 type low dropout linear regulator chip U6, capacitors C20, C21, and C22; wherein, the third pin of the low dropout linear regulator chip U6 is connected to the 5V power supply terminal and one end of capacitor C20, the second pin of the low dropout linear regulator chip U6 is connected to the VCC power supply terminal, one end of capacitor C21, and one end of capacitor C22, and the other end of capacitor C20, the first pin of the low dropout linear regulator chip U6, the other end of capacitor C21, and the other end of capacitor C22 are all grounded.

[0017] Furthermore, the receiver also includes a constant voltage circuit, which is electrically connected to the second MCU circuit; wherein the constant voltage circuit includes a BP2571D type step-down constant voltage chip U5, a fuse F1, a common mode inductor L6, a varistor MOV1, a capacitor CX1, an MB10F type rectifier DB1, a polarized capacitor C14, an inductor L8, a polarized capacitor C12, an inductor L7, a resistor R4, a polarized capacitor C19, a resistor R12, and an inductor L... 9 and inductor L10; wherein, the first pin of the step-down constant voltage chip U5 is connected to one end of inductor L7 and one end of resistor R4, the second pin of the step-down constant voltage chip U5 is connected to the other end of resistor R4, LED+ terminal, one end of inductor L9, one end of resistor R12, the positive terminal of polarized capacitor C19 and the third pin of the step-down constant voltage chip U5, the fourth pin of the step-down constant voltage chip U5 is grounded, and the other end of inductor L9 is connected to the 5V power supply terminal. Pin 5 of the step-down constant voltage chip U5 is connected to one end of inductor L8 and the positive terminal of polarized capacitor C12. Pin 8 of the step-down constant voltage chip U5 is connected to the other end of inductor L7. The negative terminal of polarized capacitor C12 is connected to the negative terminal of polarized capacitor C14, pin 4 of rectifier DB1, ground, the negative terminal of polarized capacitor C19, the other end of resistor R12, and one end of inductor L10. The other end of inductor L10 is grounded. The positive terminal of polarized capacitor C14 is... Connect the other end of inductor L8 to pin 1 of rectifier DB1. Connect pin 2 of rectifier DB1 to one end of capacitor CX1, one end of varistor MOV1, and pin 3 of common mode inductor L6. Connect pin 3 of rectifier DB1 to the other end of capacitor CX1, the other end of varistor MOV1, and pin 1 of common mode inductor L6. Connect pin 2 of common mode inductor L6 to the live wire L end through fuse F1. Connect pin 4 of common mode inductor L6 to the neutral wire N end.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: A security reminder system includes a transmitter and a receiver. The transmitter includes a first MCU circuit and a wireless transmitting circuit electrically connected to each other. The receiver includes a second MCU circuit and a wireless receiving circuit electrically connected to each other. The wireless transmitting circuit is also wirelessly connected to the wireless receiving circuit. The transmitter also includes an infrared sensing circuit electrically connected to the first MCU circuit. The receiver also includes a voice reminder circuit electrically connected to the second MCU circuit. The first MCU circuit and the second MCU circuit both include a FT61E0A3-RB type microcontroller. The wireless transmitting circuit includes a CMT2119A type wireless transmitting chip. The wireless receiving circuit includes a CMT2219A type wireless receiving chip. The voice reminder circuit includes a WTN6 type OTP voice chip. The infrared sensing circuit includes a D220AX type infrared sensor. As can be seen, this security alert system uses the CMT2119A wireless transmitter chip and CMT2219A wireless receiver chip operating in the 433MHz frequency band to establish wireless communication. Leveraging the strong penetration and high anti-interference capabilities of this frequency band, the system effectively improves the stability of wireless communication. Compared to traditional WiFi wireless communication, the 433MHz band offers more stable signals and lower power consumption in complex environments, reducing communication interruptions caused by network congestion or environmental interference, thus significantly enhancing the reliability of security monitoring. Once the infrared sensing circuit detects an anomaly in the external environment, the wireless transmitter circuit can use the 433MHz frequency band to send a wireless communication signal to the wireless receiver circuit, triggering the voice alert circuit to issue a voice prompt. This achieves accurate perception and efficient alerts, further improving the overall performance of security monitoring and the user experience. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0020] Figure 1 A block diagram of the circuit structure of the security reminder system provided in this embodiment of the utility model;

[0021] Figure 2 A schematic diagram of the circuit structure of the first MCU circuit provided in this embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the circuit structure of the wireless transmission circuit provided in this embodiment of the utility model;

[0023] Figure 4 The circuit structure schematic diagram of the infrared sensing circuit provided in the embodiment of this utility model;

[0024] Figure 5 The circuit structure schematic diagram of the first linear voltage regulator circuit provided in the embodiment of this utility model;

[0025] Figure 6 The circuit structure schematic diagram of the second linear voltage regulator circuit provided in the embodiment of this utility model;

[0026] Figure 7 The circuit structure schematic diagram of the second MCU circuit provided in the embodiment of this utility model;

[0027] Figure 8 A schematic diagram of the circuit structure of the wireless receiving circuit provided in this embodiment of the utility model;

[0028] Figure 9 A schematic diagram of the circuit structure of the voice reminder circuit provided in this embodiment of the utility model;

[0029] Figure 10 A schematic diagram of the LED driving circuit provided in this embodiment of the utility model;

[0030] Figure 11 The circuit structure schematic diagram of the third linear voltage regulator circuit provided in the embodiment of this utility model;

[0031] Figure 12 The circuit structure schematic diagram of the fourth linear voltage regulator circuit provided in the embodiment of this utility model;

[0032] Figure 13 The circuit structure diagram of the constant voltage circuit provided in the embodiment of this utility model. Detailed Implementation

[0033] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0034] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] Please refer to Figure 1 As shown, this utility model proposes a security alert system, including a transmitter and a receiver. The transmitter includes a first MCU circuit and a wireless transmitting circuit electrically connected to each other. The receiver includes a second MCU circuit and a wireless receiving circuit electrically connected to each other. The wireless transmitting circuit is also wirelessly connected to the wireless receiving circuit. The transmitter also includes an infrared sensing circuit electrically connected to the first MCU circuit. The receiver also includes a voice alert circuit electrically connected to the second MCU circuit. Both the first and second MCU circuits include an FT61E0A3-RB type microcontroller. The wireless transmitting circuit includes a CMT2119A type wireless transmitting chip. The wireless receiving circuit includes a CMT2219A type wireless receiving chip. The voice alert circuit includes a WTN6 type OTP voice chip. The infrared sensing circuit includes a D220AX type infrared sensor.

[0037] Specifically, both the first and second MCU circuits utilize the stable, low-power, and feature-rich FT61E0A3-RB general-purpose 8-bit microcontroller to ensure the security alert system possesses efficient real-time control capabilities. The wireless transmitting and receiving circuits employ the CMT2119A and CMT2219A wireless transmitting and receiving chips, respectively, operating in the 433MHz band, offering low power consumption, strong signal penetration, and high anti-interference capabilities. Their combined high sensitivity enables the rapid establishment of a long-distance and reliable wireless communication link. The voice alert circuit uses the WTN6 OTP voice chip, which supports one-time programming and delivers clear voice feedback. Its built-in power amplifier allows direct driving of a small speaker, facilitating accurate transmission of alert information. The infrared sensing circuit is equipped with a fast-responding and highly sensitive D220AX passive infrared sensor, capable of accurately detecting human presence and effectively perceiving environmental anomalies.

[0038] Compared to existing technologies, the security alert system proposed in this embodiment uses a CMT2119A wireless transmitter chip and a CMT2219A wireless receiver chip operating in the 433MHz frequency band to establish wireless communication. Leveraging the strong penetration and high anti-interference capabilities of this frequency band, the wireless communication stability of the security alert system is effectively improved. Compared to traditional WiFi wireless communication, the 433MHz frequency band offers more stable signals and lower power consumption in complex environments, reducing communication interruptions caused by network congestion or environmental interference, thus significantly enhancing the reliability of security monitoring. Once the infrared sensing circuit detects an abnormal external environment, the wireless transmitter circuit can use the 433MHz frequency band to send a wireless communication signal to the wireless receiver circuit, triggering the voice alert circuit to issue a voice prompt. This achieves accurate perception and efficient alerts, further improving the overall performance of security monitoring and the user experience.

[0039] Please refer to Figure 2 As shown, in some embodiments of this application, the first MCU circuit includes a microcontroller U3 of type FT61E0A3-RB, a phototransistor D10, a capacitor C23, a resistor R1, and a resistor R9; wherein, the first pin of the microcontroller U3 is connected to a 3.3V power supply terminal, the second pin of the microcontroller U3 is connected to the emitter of the phototransistor D10, one end of the capacitor C23, and one end of the resistor R1, the collector of the phototransistor D10 is connected to a 3.3V power supply terminal, the fourth pin of the microcontroller U3 is connected to the other end of the resistor R1 and one end of the resistor R9, the other end of the capacitor C23 and the other end of the resistor R9 are both grounded, and the 16th pin of the microcontroller U3 is grounded.

[0040] Specifically, the FT61E0A3-RB microcontroller is a highly integrated 8-bit general-purpose microcontroller with multiple built-in peripheral interfaces (such as UART, SPI, I2C, etc.), supports rich interrupt sources and timer functions, and has excellent anti-interference capabilities and low power consumption characteristics, which can meet the strict requirements of stability and response speed in the security monitoring field.

[0041] Please refer to Figure 3As shown, in some embodiments of this application, the wireless transmitting circuit includes a CMT2119A type wireless transmitting chip U2, a crystal oscillator X1, a resistor R5, a capacitor C0, an inductor L1, a capacitor C1, a resistor R4, an inductor L2, a capacitor C2, an inductor L3, a capacitor C3, an inductor L4, a capacitor C4, and an antenna ANT; wherein, the first pin of the wireless transmitting chip U2 is grounded through the crystal oscillator X1, the second pin of the wireless transmitting chip U2 is grounded, the third pin of the wireless transmitting chip U2 is connected to the DATA1 terminal and one end of the resistor R5, the other end of the resistor R5 is connected to the DATA terminal, the fourth pin of the wireless transmitting chip U2 is connected to the CLK1 terminal and one end of the resistor R4, and the resistor R... The other end of pin 4 is connected to the CLK terminal. Pin 5 of the wireless transmitter chip U2 is connected to one end of inductor L1 and one end of capacitor C1. The other end of inductor L1 is connected to the 3.3V power supply. The other end of capacitor C1 is connected to one end of inductor L2. The other end of inductor L2 is connected to one end of inductor L3 and one end of capacitor C2. The other end of inductor L3 is connected to one end of inductor L4 and one end of capacitor C3. The other end of inductor L4 is connected to one end of capacitor C4 and antenna ANT. The other ends of capacitors C2, C3, and C4 are all grounded. Pin 6 of the wireless transmitter chip U2 is connected to the 3.3V power supply and one end of capacitor C0. The other end of capacitor C0 is grounded.

[0042] Specifically, the CMT2119A wireless transmitter chip operates in the 433MHz frequency band and possesses excellent signal penetration and long-distance transmission capabilities. This wireless transmitter chip integrates a frequency synthesizer, power amplifier, and modulation module, supports multiple modulation methods, and ensures stable wireless communication signals for reliable wireless data transmission.

[0043] Please refer to Figure 4 As shown, in some embodiments of this application, the infrared sensing circuit includes a D220AX type infrared sensor PIR, an AS232-8A type serial interface chip U1, resistors R11 and R7, and capacitor C22; wherein, pins 1 and 2 of the serial interface chip U1 are both connected to a 3.3V power supply terminal, pin 5 of the serial interface chip U1 is connected to the OUT terminal through resistor R11, pin 6 of the serial interface chip U1 is connected to the SEN terminal through resistor R7 and grounded through capacitor C22, pin 7 of the serial interface chip U1 is connected to pin 2 of the infrared sensor PIR, pin 1 of the infrared sensor PIR is connected to a 3.3V power supply terminal, and pin 8 of the serial interface chip U1 and pin 3 of the infrared sensor PIR are both grounded.

[0044] Specifically, the D220AX infrared sensor is a high-sensitivity passive infrared (PIR) sensor capable of accurately detecting changes in human infrared radiation, enabling effective perception of human activity in the environment. This infrared sensor features fast response, strong anti-interference capabilities, and low power consumption, ensuring timely response and accurate detection of human activity by the security alert system.

[0045] Please refer to Figure 5 and Figure 6 As shown, in some embodiments of this application, the transmitter further includes a first linear voltage regulator circuit and a second linear voltage regulator circuit, the first linear voltage regulator circuit and the second linear voltage regulator circuit being electrically connected to the first MCU circuit respectively;

[0046] The first linear regulator circuit includes an LN1152B332MR-G type voltage linear regulator chip U4, a capacitor C16, a resistor R2, a capacitor C15, and a capacitor C17. The first pin of the voltage linear regulator chip U4 is connected to the VCC terminal, one end of capacitor C16, and one end of resistor R2. The other end of resistor R2 is connected to the third pin of the voltage linear regulator chip U4. The fifth pin of the voltage linear regulator chip U4 is connected to the 3.3V power supply terminal, one end of capacitor C15, and one end of capacitor C17. The other end of capacitor C16, the second pin of the voltage linear regulator chip U4, the other end of capacitor C15, and the other end of capacitor C17 are all grounded.

[0047] The second linear regulator circuit includes an HT7133 type low dropout linear regulator chip U5, capacitors C18, C19, and C20; wherein, the third pin of the low dropout linear regulator chip U5 is connected to the VCC terminal and one end of capacitor C18, the second pin of the low dropout linear regulator chip U5 is connected to the 3.3V power supply terminal, one end of capacitor C19, and one end of capacitor C20, and the other end of capacitor C18, the first pin of the low dropout linear regulator chip U5, the other end of capacitor C19, and the other end of capacitor C20 are all grounded.

[0048] Specifically, the transmitter is equipped with two different linear voltage regulator circuits. These circuits provide independent and stable power to different circuit modules, preventing mutual interference, and also serve as redundancy, ensuring reliable operation of the other circuit even if one fails. Furthermore, using linear voltage regulator circuits of different specifications can meet the varying voltage and current requirements of each circuit module, ensuring the transmitter's high efficiency and stability during operation. The LN1152B332MR-G voltage linear regulator chip has excellent load and temperature regulation performance and a stable output voltage. This chip incorporates overcurrent protection and thermal shutdown circuits to effectively prevent damage from overload and overheating. The HT7133 low-dropout linear regulator chip features low dropout voltage and fast response capability, with an output voltage of 3.3V. This compact and efficient chip incorporates overcurrent protection and thermal shutdown circuits to ensure the safe operation of the security alert system under abnormal conditions.

[0049] Please refer to Figure 7 and Figure 8 As shown, in some embodiments of this application, the wireless receiving circuit includes a CMT2219A type wireless receiving chip U2, inductor L2, antenna ANT, capacitor C4, inductor L3, inductor L4, capacitor C11, capacitor C0, capacitor C1, inductor L1, crystal oscillator X1, capacitor C2, and capacitor C3; wherein, pin 5 of the wireless receiving chip U2 is connected to the GP04 terminal, pin 7 of the wireless receiving chip U2 is connected to one end of crystal oscillator X1 and one end of capacitor C3, pin 8 of the wireless receiving chip U2 is connected to the other end of crystal oscillator X1 and one end of capacitor C2, the other ends of capacitor C2, the other ends of capacitor C3, and pin 13 of the wireless receiving chip U2 are all grounded. Pin 11 of U2 is connected to pin 12 of the wireless receiver chip U2 via inductor L2. Pin 14 of the wireless receiver chip U2 is connected to one end of capacitor C1 and one end of inductor L1. Pin 15 of the wireless receiver chip U2 is connected to the other end of inductor L1 and ground. Pin 16 of the wireless receiver chip U2 is connected to one end of capacitor C0 and the 3.3V power supply. The other end of capacitor C0 is grounded. The other end of capacitor C1 is connected to one end of capacitor C11, one end of inductor L3, and one end of inductor L4. The other ends of capacitor C11 and inductor L4 are both grounded. The other end of inductor L3 is connected to antenna ANT and one end of capacitor C4. The other end of capacitor C4 is grounded.

[0050] Specifically, the CMT2219A wireless receiver chip operates in the 433MHz frequency band, featuring high sensitivity and excellent signal selectivity, effectively receiving weak signals over long distances. This wireless receiver chip integrates a low-noise amplifier, frequency synthesizer, and demodulation module, supporting multiple modulation methods to ensure the stability and accuracy of received wireless communication signals.

[0051] Please refer to Figure 9 As shown, in some embodiments of this application, the voice reminder circuit includes a WTN6 type OTP voice chip U1, resistors R5 and R3, capacitors C5 and C10, connector J3, and connector J1; wherein, the first pin of the OTP voice chip U1 is connected to one end of resistor R5 and the fourth pin of connector J3, the second pin of the OTP voice chip U1 is connected to one end of resistor R3 and the third pin of connector J3, the other end of resistor R5 is connected to the DATA terminal, and the other end of resistor R3 is connected to the BUSY terminal. Pin 3 of the OTP voice chip U1 is connected to pin 2 of connector J3. Pin 4 of the OTP voice chip U1 is connected to pin 1 of connector J3. Pin 5 of the OTP voice chip U1 is connected to pin 2 of connector J1. Pin 7 of the OTP voice chip U1 is connected to pin 1 of connector J1. Pin 6 of the OTP voice chip U1 is connected to one end of capacitor C5, one end of capacitor C10, and VCC terminal. Pin 8 of the OTP voice chip U1 is connected to the other end of capacitor C5, the other end of capacitor C10, and ground terminal.

[0052] Specifically, the WTN6 OTP voice chip is a highly integrated single-chip voice storage and player that uses One-Time Programmable (OTP) technology. It supports the storage and flexible retrieval of multiple voice data segments and can also identify the physical location of the transmitter based on different voice content. This OTP voice chip supports audio files up to 170 seconds long, with a maximum sampling rate of 32kHz. It features low power consumption and excellent sound quality, enabling convenient and reliable voice prompts and information broadcasts.

[0053] Please refer to Figure 10As shown, in some embodiments of this application, the receiver further includes an LED driving circuit, which is electrically connected to the second MCU circuit. The LED driving circuit includes resistors R10 and R13, a 3400 / SOT23-3 type MOSFET Q1, a 3400 / SOT23-3 type MOSFET Q2, resistors R6, R7, R8, and R9. The source of MOSFET Q1 is connected to the source of MOSFET Q2, one end of resistor R10, and ground. The gate of MOSFET Q1 is connected to the gate of MOSFET Q2, one end of resistor R13, and the other end of resistor R10. The other end of resistor R13 is connected to the PWM terminal. The drain of MOSFET Q1 is connected to the drain of MOSFET Q2, one end of resistor R6, one end of resistor R7, one end of resistor R8, and one end of resistor R9. The other ends of resistors R6, R7, R8, and R9 are all connected to the LED terminal.

[0054] Specifically, the LED driver circuit provides a stable and reliable LED driving signal. Applying this signal to an external LED light enables a clear LED light signal alert. Combined with a voice alert circuit, the security alert system can achieve synchronized sound and light alerts, significantly improving the alert effect and user experience, and effectively increasing the response efficiency of security monitoring.

[0055] Please refer to Figure 11 and Figure 12 As shown, in some embodiments of this application, the receiver further includes a third linear voltage regulator circuit and a fourth linear voltage regulator circuit, which are electrically connected to the second MCU circuit respectively.

[0056] The third linear regulator circuit includes an LN1152B332MR-G type voltage linear regulator chip U7, capacitor C16, resistor R2, capacitor C15, and capacitor C17. Pin 1 of the voltage linear regulator chip U7 is connected to a 5V power supply terminal, one end of capacitor C16, and one end of resistor R2. The other end of resistor R2 is connected to pin 3 of the voltage linear regulator chip U7. Pin 5 of the voltage linear regulator chip U7 is connected to a 3.3V power supply terminal, one end of capacitor C15, and one end of capacitor C17. The other end of capacitor C16, pin 2 of the voltage linear regulator chip U7, the other end of capacitor C15, and the other end of capacitor C17 are all grounded.

[0057] The fourth linear regulator circuit includes a ZF7550 type low dropout linear regulator chip U6, capacitors C20, C21, and C22; wherein, the third pin of the low dropout linear regulator chip U6 is connected to the 5V power supply terminal and one end of capacitor C20, the second pin of the low dropout linear regulator chip U6 is connected to the VCC power supply terminal, one end of capacitor C21, and one end of capacitor C22, and the other end of capacitor C20, the first pin of the low dropout linear regulator chip U6, the other end of capacitor C21, and the other end of capacitor C22 are all grounded.

[0058] Specifically, like the transmitter, the receiver is also equipped with two linear voltage regulator circuits. Among them, the ZF7550 low-dropout linear regulator chip features low dropout voltage and fast response capability, small size, high efficiency, and also has overcurrent protection and thermal shutdown functions, making it suitable for providing stable power to digital circuits and microcontrollers.

[0059] Please refer to Figure 13As shown, in some embodiments of this application, the receiver further includes a constant voltage circuit, which is electrically connected to the second MCU circuit; wherein, the constant voltage circuit includes a BP2571D type step-down constant voltage chip U5, a fuse F1, a common mode inductor L6, a varistor MOV1, a capacitor CX1, an MB10F type rectifier DB1, a polarized capacitor C14, an inductor L8, a polarized capacitor C12, an inductor L7, a resistor R4, a polarized capacitor C19, and a capacitor... The circuit consists of resistors R12, inductors L9 and L10. Pin 1 of the step-down constant voltage chip U5 is connected to one end of inductor L7 and one end of resistor R4. Pin 2 of the step-down constant voltage chip U5 is connected to the other end of resistor R4, the LED+ terminal, one end of inductor L9, one end of resistor R12, the positive terminal of polarized capacitor C19, and pin 3 of the step-down constant voltage chip U5. Pin 4 of the step-down constant voltage chip U5 is grounded. The other end of inductor L9 is connected to... At the 5V power supply terminal, pin 5 of the step-down constant voltage chip U5 is connected to one end of inductor L8 and the positive terminal of polarized capacitor C12. Pin 8 of the step-down constant voltage chip U5 is connected to the other end of inductor L7. The negative terminal of polarized capacitor C12 is connected to the negative terminal of polarized capacitor C14, pin 4 of rectifier DB1, ground, the negative terminal of polarized capacitor C19, the other end of resistor R12, and one end of inductor L10. The other end of inductor L10 is grounded. Polarized capacitor C14... The positive terminals are connected to the other end of inductor L8 and pin 1 of rectifier DB1. Pin 2 of rectifier DB1 is connected to one end of capacitor CX1, one end of varistor MOV1 and pin 3 of common mode inductor L6. Pin 3 of rectifier DB1 is connected to the other end of capacitor CX1, the other end of varistor MOV1 and pin 1 of common mode inductor L6. Pin 2 of common mode inductor L6 is connected to the live wire L terminal through fuse F1. Pin 4 of common mode inductor L6 is connected to the neutral wire N terminal.

[0060] Specifically, the constant voltage circuit can stabilize the voltage to a constant level when the input power supply voltage fluctuates significantly, providing a stable input voltage source for the subsequent linear voltage regulator circuit. This not only improves the overall stability of the power supply but also effectively reduces the power consumption and heat generation of the linear voltage regulator circuit, extending its lifespan. The BP2571D buck-type constant voltage chip is a high-efficiency buck converter with a wide input voltage range and high conversion efficiency, capable of stably reducing higher input voltages to the required constant output voltage. This buck-type constant voltage chip integrates multiple protection functions, including overcurrent protection, overtemperature protection, and short-circuit protection, ensuring the safe and stable operation of the security alert system in complex power supply environments.

[0061] It should be noted that other pin connection structures and related component parameters not mentioned in the text description can be found in the attached diagram, and will not be elaborated upon here. Furthermore, the above connection layout is only an example; in actual applications, other connection schemes can be adopted according to specific requirements, and will not be further illustrated here.

[0062] The security alert system provided in this embodiment of the invention leverages the excellent penetration and anti-interference capabilities of the 433MHz band wireless communication signal to achieve stable and reliable wireless data transmission between the transmitter and receiver. Simultaneously, the system combines voice and LED light signals for synchronized alerts, significantly improving the intuitiveness and response speed of the alert information. Furthermore, the security alert system is equipped with multiple linear voltage regulator circuits and a high-efficiency step-down constant voltage chip, ensuring stable power supply to each circuit module and thus guaranteeing the overall stable and reliable performance of the product.

[0063] It should be noted that the technical solutions of the various embodiments of this utility model can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0064] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.

Claims

1. A security alert system, characterized in that, The device includes a transmitter and a receiver. The transmitter includes a first MCU circuit and a wireless transmitting circuit electrically connected to each other. The receiver includes a second MCU circuit and a wireless receiving circuit electrically connected to each other. The wireless transmitting circuit is also wirelessly connected to the wireless receiving circuit. The transmitter also includes an infrared sensing circuit electrically connected to the first MCU circuit. The receiver also includes a voice prompt circuit electrically connected to the second MCU circuit. Both the first and second MCU circuits include an FT61E0A3-RB type microcontroller. The wireless transmitting circuit includes a CMT2119A type wireless transmitting chip. The wireless receiving circuit includes a CMT2219A type wireless receiving chip. The voice prompt circuit includes a WTN6 type OTP voice chip. The infrared sensing circuit includes a D220AX type infrared sensor.

2. The security alert system according to claim 1, characterized in that, The first MCU circuit includes an FT61E0A3-RB type microcontroller U3, a phototransistor D10, a capacitor C23, a resistor R1, and a resistor R9. The first pin of the microcontroller U3 is connected to a 3.3V power supply. The second pin of the microcontroller U3 is connected to the emitter of the phototransistor D10, one end of the capacitor C23, and one end of the resistor R1. The collector of the phototransistor D10 is connected to the 3.3V power supply. The fourth pin of the microcontroller U3 is connected to the other end of the resistor R1 and one end of the resistor R9. The other ends of the capacitor C23 and the other ends of the resistor R9 are both grounded. The 16th pin of the microcontroller U3 is grounded.

3. The security alert system according to claim 1, characterized in that, The wireless transmitting circuit includes a CMT2119A type wireless transmitting chip U2, crystal oscillator X1, resistor R5, capacitor C0, inductor L1, capacitor C1, resistor R4, inductor L2, capacitor C2, inductor L3, capacitor C3, inductor L4, capacitor C4, and antenna ANT. Pin 1 of the wireless transmitting chip U2 is grounded through crystal oscillator X1; pin 2 of the wireless transmitting chip U2 is grounded; pin 3 of the wireless transmitting chip U2 is connected to the DATA1 terminal and one end of resistor R5, with the other end of resistor R5 connected to the DATA terminal; pin 4 of the wireless transmitting chip U2 is connected to the CLK1 terminal and one end of resistor R4, with the other end of resistor R4 connected to... At the CLK terminal, pin 5 of the wireless transmitter chip U2 is connected to one end of inductor L1 and one end of capacitor C1. The other end of inductor L1 is connected to the 3.3V power supply. The other end of capacitor C1 is connected to one end of inductor L2. The other end of inductor L2 is connected to one end of inductor L3 and one end of capacitor C2. The other end of inductor L3 is connected to one end of inductor L4 and one end of capacitor C3. The other end of inductor L4 is connected to one end of capacitor C4 and antenna ANT. The other ends of capacitors C2, C3, and C4 are all grounded. Pin 6 of the wireless transmitter chip U2 is connected to the 3.3V power supply and one end of capacitor C0. The other end of capacitor C0 is grounded.

4. The security alert system according to claim 1, characterized in that, The infrared sensing circuit includes a D220AX type infrared sensor PIR, an AS232-8A type serial interface chip U1, resistors R11 and R7, and capacitor C22. Pins 1 and 2 of the serial interface chip U1 are both connected to a 3.3V power supply. Pin 5 of the serial interface chip U1 is connected to the OUT terminal via resistor R11. Pin 6 of the serial interface chip U1 is connected to the SEN terminal via resistor R7 and grounded via capacitor C22. Pin 7 of the serial interface chip U1 is connected to pin 2 of the infrared sensor PIR. Pin 1 of the infrared sensor PIR is connected to the 3.3V power supply. Pin 8 of the serial interface chip U1 and pin 3 of the infrared sensor PIR are both grounded.

5. The security alert system according to claim 1, characterized in that, The transmitter further includes a first linear voltage regulator circuit and a second linear voltage regulator circuit, which are electrically connected to the first MCU circuit respectively. The first linear regulator circuit includes an LN1152B332MR-G type voltage linear regulator chip U4, a capacitor C16, a resistor R2, a capacitor C15, and a capacitor C17. The first pin of the voltage linear regulator chip U4 is connected to the VCC terminal, one end of capacitor C16, and one end of resistor R2. The other end of resistor R2 is connected to the third pin of the voltage linear regulator chip U4. The fifth pin of the voltage linear regulator chip U4 is connected to the 3.3V power supply terminal, one end of capacitor C15, and one end of capacitor C17. The other end of capacitor C16, the second pin of the voltage linear regulator chip U4, the other end of capacitor C15, and the other end of capacitor C17 are all grounded. The second linear regulator circuit includes an HT7133 type low dropout linear regulator chip U5, capacitors C18, C19, and C20; wherein, the third pin of the low dropout linear regulator chip U5 is connected to the VCC terminal and one end of capacitor C18, the second pin of the low dropout linear regulator chip U5 is connected to the 3.3V power supply terminal, one end of capacitor C19, and one end of capacitor C20, and the other end of capacitor C18, the first pin of the low dropout linear regulator chip U5, the other end of capacitor C19, and the other end of capacitor C20 are all grounded.

6. The security alert system according to claim 1, characterized in that, The wireless receiving circuit includes a CMT2219A type wireless receiving chip U2, inductor L2, antenna ANT, capacitor C4, inductor L3, inductor L4, capacitor C11, capacitor C0, capacitor C1, inductor L1, crystal oscillator X1, capacitor C2, and capacitor C3. Pin 5 of the wireless receiving chip U2 is connected to the GP04 terminal. Pin 7 of the wireless receiving chip U2 is connected to one end of crystal oscillator X1 and one end of capacitor C3. Pin 8 of the wireless receiving chip U2 is connected to the other end of crystal oscillator X1 and one end of capacitor C2. The other ends of capacitors C2 and C3, and pin 13 of the wireless receiving chip U2 are all grounded. Pin 11 of the wireless receiving chip U2... The pin is connected to pin 12 of the wireless receiver chip U2 via inductor L2. Pin 14 of the wireless receiver chip U2 is connected to one end of capacitor C1 and one end of inductor L1. Pin 15 of the wireless receiver chip U2 is connected to the other end of inductor L1 and ground. Pin 16 of the wireless receiver chip U2 is connected to one end of capacitor C0 and the 3.3V power supply. The other end of capacitor C0 is grounded. The other end of capacitor C1 is connected to one end of capacitor C11, one end of inductor L3, and one end of inductor L4. The other ends of capacitor C11 and inductor L4 are both grounded. The other end of inductor L3 is connected to antenna ANT and one end of capacitor C4. The other end of capacitor C4 is grounded.

7. The security alert system according to claim 1, characterized in that, The voice reminder circuit includes a WTN6 type OTP voice chip U1, resistors R5 and R3, capacitors C5 and C10, connector J3, and connector J1. Specifically, pin 1 of the OTP voice chip U1 is connected to one end of resistor R5 and pin 4 of connector J3; pin 2 of the OTP voice chip U1 is connected to one end of resistor R3 and pin 3 of connector J3; the other end of resistor R5 is connected to the DATA terminal; the other end of resistor R3 is connected to the BUSY terminal; pin 3 of the OTP voice chip U1 is connected to pin 2 of connector J3; pin 4 of the OTP voice chip U1 is connected to pin 1 of connector J3; pin 5 of the OTP voice chip U1 is connected to pin 2 of connector J1; pin 7 of the OTP voice chip U1 is connected to pin 1 of connector J1; pin 6 of the OTP voice chip U1 is connected to one end of capacitor C5, one end of capacitor C10, and the VCC terminal; and pin 8 of the OTP voice chip U1 is connected to the other end of capacitor C5, the other end of capacitor C10, and the ground terminal.

8. The security alert system according to claim 1, characterized in that, The receiver also includes an LED driving circuit, which is electrically connected to the second MCU circuit. The LED driving circuit includes resistors R10 and R13, a 3400 / SOT23-3 type MOSFET Q1, a 3400 / SOT23-3 type MOSFET Q2, resistors R6, R7, R8, and R9. The source of MOSFET Q1 is connected to the source of MOSFET Q2, one end of resistor R10, and ground. The gate of MOSFET Q1 is connected to the gate of MOSFET Q2, one end of resistor R13, and the other end of resistor R10. The other end of resistor R13 is connected to the PWM terminal. The drain of MOSFET Q1 is connected to the drain of MOSFET Q2, one end of resistor R6, one end of resistor R7, one end of resistor R8, and one end of resistor R9. The other ends of resistors R6, R7, R8, and R9 are all connected to the LED terminal.

9. The security alert system according to claim 1, characterized in that, The receiver further includes a third linear voltage regulator circuit and a fourth linear voltage regulator circuit, which are electrically connected to the second MCU circuit respectively. The third linear regulator circuit includes an LN1152B332MR-G type voltage linear regulator chip U7, capacitor C16, resistor R2, capacitor C15, and capacitor C17. Pin 1 of the voltage linear regulator chip U7 is connected to a 5V power supply terminal, one end of capacitor C16, and one end of resistor R2. The other end of resistor R2 is connected to pin 3 of the voltage linear regulator chip U7. Pin 5 of the voltage linear regulator chip U7 is connected to a 3.3V power supply terminal, one end of capacitor C15, and one end of capacitor C17. The other end of capacitor C16, pin 2 of the voltage linear regulator chip U7, the other end of capacitor C15, and the other end of capacitor C17 are all grounded. The fourth linear regulator circuit includes a ZF7550 type low dropout linear regulator chip U6, capacitors C20, C21, and C22; wherein, the third pin of the low dropout linear regulator chip U6 is connected to the 5V power supply terminal and one end of capacitor C20, the second pin of the low dropout linear regulator chip U6 is connected to the VCC power supply terminal, one end of capacitor C21, and one end of capacitor C22, and the other end of capacitor C20, the first pin of the low dropout linear regulator chip U6, the other end of capacitor C21, and the other end of capacitor C22 are all grounded.

10. The security alert system according to claim 1, characterized in that, The receiver further includes a constant voltage circuit, which is electrically connected to the second MCU circuit; wherein the constant voltage circuit includes a BP2571D type step-down constant voltage chip U5, a fuse F1, a common mode inductor L6, a varistor MOV1, a capacitor CX1, an MB10F type rectifier DB1, a polarized capacitor C14, an inductor L8, a polarized capacitor C12, an inductor L7, a resistor R4, a polarized capacitor C19, a resistor R12, an inductor L9, and a... Inductor L10; wherein, the first pin of the step-down constant voltage chip U5 is connected to one end of inductor L7 and one end of resistor R4, the second pin of the step-down constant voltage chip U5 is connected to the other end of resistor R4, LED+ terminal, one end of inductor L9, one end of resistor R12, the positive terminal of polarized capacitor C19, and the third pin of the step-down constant voltage chip U5, the fourth pin of the step-down constant voltage chip U5 is grounded, and the other end of inductor L9 is connected to the 5V power supply terminal. Pin 5 of the step-down constant voltage chip U5 is connected to one end of inductor L8 and the positive terminal of polarized capacitor C12. Pin 8 of the step-down constant voltage chip U5 is connected to the other end of inductor L7. The negative terminal of polarized capacitor C12 is connected to the negative terminal of polarized capacitor C14, pin 4 of rectifier DB1, ground, the negative terminal of polarized capacitor C19, the other end of resistor R12, and one end of inductor L10. The other end of inductor L10 is grounded. The positive terminal of polarized capacitor C14 is connected to... Connect the other end of inductor L8 to pin 1 of rectifier DB1. Connect pin 2 of rectifier DB1 to one end of capacitor CX1, one end of varistor MOV1, and pin 3 of common mode inductor L6. Connect pin 3 of rectifier DB1 to the other end of capacitor CX1, the other end of varistor MOV1, and pin 1 of common mode inductor L6. Connect pin 2 of common mode inductor L6 to the live wire L end through fuse F1. Connect pin 4 of common mode inductor L6 to the neutral wire N end.

Images