A vehicle reverse alarm detection control circuit and a reverse alarm
By designing a vehicle reversing alarm detection and control circuit, the first and second level alarms of the reversing alarm were realized, improving the timeliness and stability of the alarm effect, enhancing the ease of use, and ensuring the reliability of the alarm sound while controlling costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU TONNY ELECTRIC & TOOLS
- Filing Date
- 2025-03-22
- Publication Date
- 2026-06-19
AI Technical Summary
Existing reversing alarms use a constant alarm sound when an obstacle is detected, which has poor alarm effect and is not convenient to use.
Design a vehicle reversing alarm detection and control circuit. Through the connection of control chip and solder pad, it realizes first-level and second-level alarms. In the alarm sound amplification circuit, transistors and field-effect transistors are used to control the alarm volume of the buzzer. Combined with the communication port of the reversing radar system, the alarm signal is transmitted in a timely manner.
It improves the alarm effect, ensures the timeliness and stability of alarm signals, enhances the ease of use and reliability, and reduces production costs.
Smart Images
Figure CN224383776U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of reversing alarm manufacturing technology, specifically relating to a vehicle reversing alarm detection and control circuit and a reversing alarm device. Background Technology
[0002] CN 205706401 U, entitled "A Simple Reversing Alarm," includes a speaker and a circuit board connected to the speaker. The circuit board is equipped with a power module, a detection module, a main control module, and a drive module connected in sequence. The input terminal of the power module is connected to the vehicle's battery, and the output terminal is connected to the detection module. A diode is also connected between the power module and the detection module. The detection module is a voltage transformer with a variable circuit. The main control module uses a microcontroller U1. The output terminal of the drive module is connected to the speaker. The diode includes a reverse-connection protection diode D1 and a Zener diode D2 connected in parallel, wherein the reverse-connection protection diode D1 is a 1N4007 type, and the Zener diode D2 is a 5V1 type. At least two current-limiting resistors R3 and R4 and a filter capacitor C3 are provided on the variable circuit. Its drawback is that this simple reversing alarm uses a constant alarm sound (it continuously alarms at a constant volume when the reversing radar detects that the distance between the vehicle and an obstacle has reached the alarm value), resulting in relatively poor alarm effectiveness. Utility Model Content
[0003] Design objective: To overcome the shortcomings of the prior art, this design aims to create a vehicle reversing alarm detection and control circuit and a reversing alarm device that not only provides better alarm performance (first-level and second-level alarms within the alarm range), but also delivers timely and stable alarm signals while being easy to use.
[0004] Design scheme: To achieve the above design objectives.
[0005] 1. In the alarm signal generating circuit, pin 1 of the control chip is electrically connected via wires to pin 2 of the control chip, one end of capacitor C2, one end of capacitor C3, one end of resistor R1, and the negative terminal of diode D2. The other end of capacitor C2 is electrically connected via wires to one end of capacitor C1 and pin 14 of the control chip. The other end of capacitor C1 is electrically connected via wires to the first solder pad. The other end of capacitor C3 is electrically connected via wires to the first solder pad. The other end of resistor R1 is electrically connected via wires to the control chip... Pin 3 provides an electrical connection. The positive terminal of diode D2 is electrically connected to pin 6 of the control chip via a wire. Pin 4 of the control chip is electrically connected to pin 5 of the control chip, the output terminal of the three-terminal regulator, and one end of capacitor C9 via wires. The common terminal of the three-terminal regulator and the other end of capacitor C9 are electrically connected to the first solder pad via wires. The input terminal of the three-terminal regulator is electrically connected to the fourth solder pad via a wire. Pin 7 of the control chip is electrically connected to the first solder pad via a wire. Pin 8 of the control chip is electrically connected to... The wires are electrically connected to one end of resistor R4, one end of resistor R15, pin 12 of the control chip, and pin 13 of the control chip, respectively. The other end of resistor R4 is electrically connected to the negative terminal of diode D4 via a wire, and the positive terminal of diode D4 is electrically connected to one end of capacitor C4, the other end of resistor R15, pin 9 of the control chip, and the positive terminal of diode D3 via wires, respectively. The other end of capacitor C4 is electrically connected to the first solder pad via a wire, and the negative terminal of diode D3 is electrically connected to pin 10 of the control chip via a wire. The connection is as follows: the output terminal of the three-terminal Zener diode is electrically connected to pin 14 of the control chip via a wire; pin 11 of the control chip is electrically connected to one end of resistor R12 in the reversing alarm circuit via a wire; the second solder piece is electrically connected to the positive terminal of diode D10 in the reversing alarm circuit via a wire; and the third solder piece is electrically connected to one end of resistor R16 via a wire, with the other end of resistor R16 electrically connected to the positive terminal of diode D6 in the alarm sound amplification circuit via a wire. This design is one of the technical features of this utility model. The purpose of this design is that, in use, the second solder piece 5 and the third solder piece 6 are respectively connected to the corresponding communication terminals in the controller of the car reversing radar system via data lines (this is prior art and will not be described further here); the first solder piece is grounded via a wire; and the fourth solder piece 7 is connected to the power supply via a wire. When the car reversing radar system sends an electrical signal to the control chip in the alarm signal generation circuit 2 via the second solder pad 5, the alarm signal generation circuit 2 will generate an alarm signal. At this time, the control chip in the alarm signal generation circuit 2 will control the buzzer in the reversing alarm circuit 1 to sound an alarm.When the car's reversing radar system sends an electrical signal to the alarm sound amplification circuit 3 via the third solder pad 6, the buzzer in the reversing alarm circuit 1 will increase its alarm sound. When the car is reversing and the reversing radar system starts working, when the reversing radar detects an obstacle behind it reaching the set value A, the car's reversing radar system sends an electrical signal to the control chip in the alarm signal generation circuit 2 via the second solder pad 5. At this time, the buzzer starts to sound (performing a first-level alarm). When the reversing radar detects an obstacle behind it reaching the set value B (A and B are the distance values between the car and the obstacle, with distance value A being greater than distance value B), the car's reversing radar system sends an electrical signal to the alarm sound amplification circuit 3 via the third solder pad 6. At this time, the buzzer in the reversing alarm circuit 1 will... Increasing the alarm volume (for a secondary alarm) improves the effectiveness of a vehicle reversing alarm detection and control circuit and a reversing alarm device. Simultaneously, the placement of the first, second, third, and fourth solder pads enhances the ease of use of the vehicle reversing alarm detection and control circuit and the reversing alarm device. Furthermore, pin 1 of the control chip in the alarm signal generation circuit is electrically connected via wires to pin 2 of the control chip, one end of capacitor C2, one end of capacitor C3, one end of resistor R1, and the negative terminal of diode D2. The other end of capacitor C2 is electrically connected via wires to one end of capacitor C1 and pin 14 of the control chip. The other end of capacitor C1 is electrically connected via wires to the first solder pad. The other end of capacitor C3 is electrically connected to the first solder pad via a wire. The other end of resistor R1 is electrically connected to pin 3 of the control chip via a wire. The positive terminal of diode D2 is electrically connected to pin 6 of the control chip via a wire. Pin 4 of the control chip is electrically connected to pin 5 of the control chip, the output terminal of the three-terminal regulator, and one end of capacitor C9 via wires. The common terminal of the three-terminal regulator and the other end of capacitor C9 are electrically connected to the first solder pad via wires. The input terminal of the three-terminal regulator is electrically connected to the fourth solder pad via a wire. Pin 7 of the control chip is electrically connected to the first solder pad via a wire. Pin 8 of the control chip is electrically connected to one end of resistor R4, the output terminal of the three-terminal regulator, and the output terminal of the three-terminal regulator via a wire. One end of resistor R15 is electrically connected to pins 12 and 13 of the control chip. The other end of resistor R4 is electrically connected to the negative terminal of diode D4 via a wire. The positive terminal of diode D4 is electrically connected to one end of capacitor C4, the other end of resistor R15, pin 9 of the control chip, and the positive terminal of diode D3 via wires. The other end of capacitor C4 is electrically connected to the first solder pad via a wire. The negative terminal of diode D3 is electrically connected to pin 10 of the control chip via a wire. The output terminal of the three-terminal Zener diode is electrically connected to pin 14 of the control chip via a wire. Pin 11 of the control chip is electrically connected to one end of resistor R12 in the reversing alarm circuit via a wire.The second solder pad is electrically connected to the positive terminal of diode D10 in the reversing alarm circuit via a wire. The third solder pad is electrically connected to one end of resistor R16 via a wire, and the other end of resistor R16 is electrically connected to the positive terminal of diode D6 in the alarm sound amplification circuit via a wire. This ensures that the alarm signal generation circuit can generate alarm signals promptly and stably.
[0006] 2. In the alarm sound amplification circuit, the base terminal of transistor Q1 is electrically connected to one end of resistor R9 via a wire, and the other end of resistor R9 is electrically connected to one end of resistor R10 and one end of capacitor C5 via wires. The other end of resistor R10 is electrically connected to the negative terminal of Zener diode via a wire. The other end of capacitor C5 and the positive terminal of Zener diode are electrically connected to the first solder pad via wires. The emitter terminal of transistor Q1 is electrically connected to one end of capacitor C6 via a wire, and the other end of capacitor C6 is connected to... The second technical feature of this utility model is that the transistor Q1 is electrically connected to the first solder pad via a wire, the emitter terminal of the transistor Q1 is electrically connected to the fourth solder pad via a wire, the collector terminal of the transistor Q1 is electrically connected to one end of the resistor R7 and the positive terminal of the polarized capacitor E1 via wires, the negative terminal of the polarized capacitor E1 is electrically connected to the first solder pad via a wire, and the other end of the resistor R7 is electrically connected to one end of the resistor R6 via a wire, and the other end of the resistor R6 is electrically connected to the negative terminal of the diode D6 via a wire. The purpose of this design is as follows: the base terminal of transistor Q1 in the alarm sound amplification circuit is electrically connected to one end of resistor R9 via a wire, and the other end of resistor R9 is electrically connected to one end of resistor R10 and one end of capacitor C5 via wires. The other end of resistor R10 is electrically connected to the negative terminal of Zener diode via a wire. The other end of capacitor C5 and the positive terminal of Zener diode are electrically connected to the first solder joint via wires. The emitter terminal of transistor Q1 is electrically connected to one end of capacitor C6 via a wire, and the other end of capacitor C6 is electrically connected to the first solder joint via a wire. The emitter terminal of transistor Q1 is electrically connected to the fourth solder pad via a wire. The collector terminal of transistor Q1 is electrically connected to one end of resistor R7 and the positive terminal of polarized capacitor E1 via wires. The negative terminal of polarized capacitor E1 is electrically connected to the first solder pad via a wire. The other end of resistor R7 is electrically connected to one end of resistor R6 via a wire, and the other end of resistor R6 is electrically connected to the negative terminal of diode D6 via a wire. This structure of the alarm sound amplifier circuit ensures the reliability of the alarm sound amplifier circuit while controlling the production cost.
[0007] 3. In the reversing alarm circuit, the negative terminal of diode D10 is electrically connected to one end of resistor R17 via a wire. The other end of resistor R17 is electrically connected to the base of transistor Q3 and one end of resistor R18 via wires. The collector of transistor Q3 is electrically connected to one end of resistor R19 and the base of transistor Q2 via wires. The other end of resistor R18, the emitter of transistor Q3, and the emitter of transistor Q2 are electrically connected to the first solder pad via wires. The collector of transistor Q2 is electrically connected to one end of resistor R20 and the gate of field-effect transistor M2 via wires. The other ends of resistor R20 and resistor R19 are electrically connected to the fourth solder pad via wires. The drain of field-effect transistor M2 is electrically connected to one end of the buzzer and one end of resistor R13 via wires. The other end of the buzzer and the source terminal of the field-effect transistor M2 are electrically connected to the first solder pad through wires. The other end of the buzzer is electrically connected to one end of the resistor R11 and the negative terminal of the diode D8 through wires. The other end of the resistor R11 is electrically connected to the positive terminal of the diode D9 through wires. The negative terminal of the diode D9 is electrically connected to the positive terminal of the diode D8, the negative terminal of the diode D7, and the drain terminal of the field-effect transistor M1 through wires. The positive terminal of the diode D7 is electrically connected to one end of the resistor R8 and one end of the inductor L1 through wires. The other end of the resistor R8 and the other end of the inductor L1 are electrically connected to the fourth solder pad through wires. The design that the source terminal of the field-effect transistor M1 is electrically connected to the first solder pad through wires and the gate terminal of the field-effect transistor M1 is electrically connected to the other end of the resistor R12 through wires is the third technical feature of this utility model.The purpose of this design is as follows: the negative terminal of diode D10 in the reversing alarm circuit is electrically connected to one end of resistor R17 via a wire; the other end of resistor R17 is electrically connected to the base of transistor Q3 and one end of resistor R18 via wires; the collector of transistor Q3 is electrically connected to one end of resistor R19 and the base of transistor Q2 via wires; the other end of resistor R18, the emitter of transistor Q3, and the emitter of transistor Q2 are electrically connected to the first solder pad via wires; the collector of transistor Q2 is electrically connected to one end of resistor R20 and the gate of MOSFET M2 via wires; the other ends of resistor R20 and resistor R19 are electrically connected to the fourth solder pad via wires; the drain of MOSFET M2 is electrically connected to one end of the buzzer and one end of resistor R13 via wires; and the other end of resistor R13 is electrically connected to the MOSFET... The source terminal of M2 is electrically connected to the first solder pad via wires. The other end of the buzzer is electrically connected to one end of resistor R11 and the negative terminal of diode D8 via wires. The other end of resistor R11 is electrically connected to the positive terminal of diode D9 via wires. The negative terminal of diode D9 is electrically connected to the positive terminal of diode D8, the negative terminal of diode D7, and the drain terminal of field-effect transistor M1 via wires. The positive terminal of diode D7 is electrically connected to one end of resistor R8 and one end of inductor L1 via wires. The other ends of resistor R8 and inductor L1 are electrically connected to the fourth solder pad via wires. The source terminal of field-effect transistor M1 is electrically connected to the first solder pad via wires, and the gate terminal of field-effect transistor M1 is electrically connected to the other end of resistor R12 via wires. This reversing alarm circuit structure ensures the reliability of the reversing alarm circuit while controlling the production cost.
[0008] Technical Solution 1: A vehicle reversing alarm detection and control circuit, comprising a reversing alarm circuit, an alarm signal generation circuit, an alarm sound amplification circuit, a first solder pad, a second solder pad, a third solder pad, and a fourth solder pad. The first solder pad is used for grounding, and the fourth solder pad is used for connecting to a power supply. Pin 1 of the control chip in the alarm signal generation circuit is electrically connected via wires to pin 2 of the control chip, one end of capacitor C2, one end of capacitor C3, one end of resistor R1, and the negative terminal of diode D2, respectively. The other end of capacitor C2 is electrically connected via wires to one end of capacitor C1 and pin 14 of the control chip, respectively. The other end of capacitor C1 is electrically connected to the first solder pad via a wire. The other end of capacitor C3 is electrically connected to the first solder pad via a wire. The other end of resistor R1 is electrically connected to pin 3 of the control chip via a wire. The positive terminal of diode D2 is electrically connected to pin 6 of the control chip via a wire. Pin 4 of the control chip is electrically connected to pin 5 of the control chip, the output terminal of the three-terminal regulator, and one end of capacitor C9 via wires. The common terminal of the three-terminal regulator and the other end of capacitor C9 are electrically connected to the first solder pad via wires. The input of the three-terminal regulator... The first terminal is electrically connected to the fourth solder pad via a wire. Pin 7 of the control chip is electrically connected to the first solder pad via a wire. Pin 8 of the control chip is electrically connected to one end of resistor R4, one end of resistor R15, pin 12 of the control chip, and pin 13 of the control chip via wires. The other end of resistor R4 is electrically connected to the negative terminal of diode D4 via a wire, and the positive terminal of diode D4 is electrically connected to one end of capacitor C4, the other end of resistor R15, pin 9 of the control chip, and the positive terminal of diode D3 via wires. The other end of capacitor C4 is electrically connected to the first solder pad via a wire. The three-terminal Zener diode is electrically connected to the control chip. The negative terminal of the diode D3 is electrically connected to pin 10 of the control chip via a wire. The output terminal of the three-terminal Zener diode is electrically connected to pin 14 of the control chip via a wire. Pin 11 of the control chip is electrically connected to one end of resistor R12 in the reversing alarm circuit via a wire. The second solder pad is electrically connected to the positive terminal of diode D10 in the reversing alarm circuit via a wire. The third solder pad is electrically connected to one end of resistor R16 via a wire, and the other end of resistor R16 is electrically connected to the positive terminal of diode D6 in the alarm sound amplification circuit via a wire.
[0009] Technical Solution 2: A reversing alarm device, comprising an alarm device housing and a circuit board, wherein the circuit board is installed inside the alarm device housing, and the circuit board is provided with a vehicle reversing alarm detection and control circuit.
[0010] Compared with the prior art, the present invention provides a vehicle reversing alarm detection and control circuit and a reversing alarm device that not only have a better alarm effect, but also provide timely and stable alarm signals, and are easy to use. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the alarm signal generation circuit in a vehicle reversing alarm detection and control circuit.
[0012] Figure 2 This is a schematic diagram of the reversing alarm circuit in a vehicle reversing alarm detection and control circuit.
[0013] Figure 3 This is a schematic diagram of the alarm sound amplification circuit in a vehicle reversing alarm detection and control circuit.
[0014] Figure 4 This is a schematic diagram of the exploded structure of a reversing alarm.
[0015] Figure 5 This is a 3D structural diagram of a reversing alarm. Detailed Implementation
[0016] Example 1: Refer to Appendix Figures 1-4A vehicle reversing alarm detection and control circuit includes a reversing alarm circuit 1, an alarm signal generating circuit 2, an alarm sound amplification circuit 3, a first solder pad 4, a second solder pad 5, a third solder pad 6, and a fourth solder pad 7. The first solder pad 4 is used for grounding, and the fourth solder pad 7 is used for connecting to a power supply. Pin 1 of the control chip in the alarm signal generating circuit 2 is electrically connected via wires to pin 2 of the control chip, one end of capacitor C2, one end of capacitor C3, one end of resistor R1, and the negative terminal of diode D2, respectively. The other end of capacitor C2 is electrically connected via wires to one end of capacitor C1 and pin 14 of the control chip, respectively. The capacitor C1 is electrically connected to the first solder pad via a wire, the capacitor C3 is electrically connected to the first solder pad via a wire, the resistor R1 is electrically connected to pin 3 of the control chip via a wire, the positive terminal of the diode D2 is electrically connected to pin 6 of the control chip via a wire, pin 4 of the control chip is electrically connected to pin 5 of the control chip, the output terminal of the three-terminal regulator, and one end of capacitor C9 via wires, the common terminal of the three-terminal regulator and the other end of capacitor C9 are electrically connected to the first solder pad via wires, and the input of the three-terminal regulator... The first solder pad is electrically connected to the fourth solder pad via a wire. Pin 7 of the control chip is electrically connected to the first solder pad via a wire. Pin 8 of the control chip is electrically connected to one end of resistor R4, one end of resistor R15, pin 12 of the control chip, and pin 13 of the control chip via wires. The other end of resistor R4 is electrically connected to the negative terminal of diode D4 via a wire, and the positive terminal of diode D4 is electrically connected to one end of capacitor C4, the other end of resistor R15, pin 9 of the control chip, and the positive terminal of diode D3 via wires. The other end of capacitor C4 is electrically connected to the first solder pad via a wire. The diode D3 is electrically connected to pin 10 of the control chip via a wire. The output of the three-terminal Zener diode is electrically connected to pin 14 of the control chip via a wire. Pin 11 of the control chip is electrically connected to one end of resistor R12 in the reversing alarm circuit via a wire. The second solder piece 5 is electrically connected to the positive terminal of diode D10 in the reversing alarm circuit 1 via a wire. The third solder piece 6 is electrically connected to one end of resistor R16 via a wire, and the other end of resistor R16 is electrically connected to the positive terminal of diode D6 in the alarm sound amplification circuit 3 via a wire. In use, the second solder piece 5 and the third solder piece 6 are connected to the corresponding communication terminals in the controller of the car reversing radar system via data lines (this is existing technology and will not be described further here). The first solder piece is grounded via a wire, and the fourth solder piece 7 is connected to the power supply via a wire.When the car reversing radar system sends an electrical signal to the control chip in the alarm signal generation circuit 2 via the second solder pad 5, the alarm signal generation circuit 2 will generate an alarm signal. At this time, the control chip in the alarm signal generation circuit 2 will control the buzzer in the reversing alarm circuit 1 to sound an alarm. When the car reversing radar system sends an electrical signal to the alarm sound amplification circuit 3 via the third solder pad 6, the buzzer in the reversing alarm circuit 1 will increase the alarm sound. When the car is reversing and the car reversing radar system starts working, when the reversing radar detects an obstacle behind it reaching the set value A, the car reversing radar system sends an electrical signal to the control chip in the alarm signal generation circuit 2 via the second solder pad 5, at which time the buzzer starts to sound an alarm. When the reversing radar detects an obstacle behind it reaching the set value B (A and B are the distance values between the car and the obstacle, with distance value A being greater than distance value B), the car reversing radar system sends an electrical signal to the alarm sound amplification circuit 3 via the third solder pad 6, at which time the buzzer in the reversing alarm circuit 1 will increase the alarm volume, thereby improving the performance of the vehicle reversing alarm detection and control circuit and the reversing alarm device.
[0017] The base of transistor Q1 in the alarm sound amplification circuit 3 is electrically connected to one end of resistor R9 via a wire, and the other end of resistor R9 is electrically connected to one end of resistor R10 and one end of capacitor C5 via a wire. The other end of resistor R10 is electrically connected to the negative terminal of Zener diode via a wire. The other end of capacitor C5 and the positive terminal of Zener diode are electrically connected to the first solder joint via wires. The emitter of transistor Q1 is electrically connected to one end of capacitor C6 via a wire, and the other end of capacitor C6 is electrically connected to the first solder joint via a wire. The emitter of transistor Q1 is electrically connected to the fourth solder joint via a wire. The collector of transistor Q1 is electrically connected to one end of resistor R7 and the positive terminal of polarized capacitor E1 via a wire. The negative terminal of polarized capacitor E1 is electrically connected to the first solder joint via a wire. The other end of resistor R7 is electrically connected to one end of resistor R6 via a wire, and the other end of resistor R6 is electrically connected to the negative terminal of diode D6 via a wire.
[0018] In the reversing alarm circuit 1, the negative terminal of diode D10 is electrically connected to one end of resistor R17 via a wire. The other end of resistor R17 is electrically connected to the base of transistor Q3 and one end of resistor R18 via wires. The collector of transistor Q3 is electrically connected to one end of resistor R19 and the base of transistor Q2 via wires. The other end of resistor R18, the emitter of transistor Q3, and the emitter of transistor Q2 are electrically connected to the first solder pad via wires. The collector of transistor Q2 is electrically connected to one end of resistor R20 and the gate of field-effect transistor M2 via wires. The other ends of resistor R20 and resistor R19 are electrically connected to the fourth solder pad via wires. The drain of field-effect transistor M2 is electrically connected to one end of the buzzer and one end of resistor R13 via wires. The other end of resistor R13 and the source terminal of MOSFET M2 are electrically connected to the first solder pad via wires. The other end of the buzzer is electrically connected to one end of resistor R11 and the negative terminal of diode D8 via wires. The other end of resistor R11 is electrically connected to the positive terminal of diode D9 via wires. The negative terminal of diode D9 is electrically connected to the positive terminal of diode D8, the negative terminal of diode D7, and the drain terminal of MOSFET M1 via wires. The positive terminal of diode D7 is electrically connected to one end of resistor R8 and one end of inductor L1 via wires. The other ends of resistor R8 and inductor L1 are electrically connected to the fourth solder pad via wires. The source terminal of MOSFET M1 is electrically connected to the first solder pad via wires, and the gate terminal of MOSFET M1 is electrically connected to the other end of resistor R12 via wires. The control chip is model 74HC132D.
[0019] Example 2: Based on Example 1, refer to Appendix Figure 5 A reversing alarm includes an alarm housing 8 and a circuit board 9. The circuit board 9 is installed inside the alarm housing 8 and is equipped with a vehicle reversing alarm detection and control circuit. A first solder pad 4, a second solder pad 5, a third solder pad 6, and a fourth solder pad 7 are fixedly mounted side-by-side on the alarm housing 8, with the outer ends of all four solder pads extending beyond the alarm housing 8.
[0020] It should be understood that although the above embodiments provide a relatively detailed textual description of the design concept of this utility model, these textual descriptions are merely simple textual descriptions of the design concept of this utility model, and not limitations on the design concept of this utility model. Any combination, addition, or modification that does not exceed the design concept of this utility model shall fall within the protection scope of this utility model.
Claims
1. A vehicle reversing alarm detection and control circuit, comprising a reversing alarm circuit (1), an alarm signal generating circuit (2), an alarm sound amplification circuit (3), a first solder pad (4), a second solder pad (5), a third solder pad (6), and a fourth solder pad (7), wherein the first solder pad (4) is used for grounding, and the fourth solder pad (7) is used for connecting to a power supply, characterized in that: The control chip pin 1 in the alarm signal generating circuit (2) is electrically connected to the control chip pin 2, one end of capacitor C2, one end of capacitor C3, one end of resistor R1, and the negative terminal of diode D2 via wires. The other end of capacitor C2 is electrically connected to one end of capacitor C1 and pin 14 of the control chip via wires. The other end of capacitor C1 is electrically connected to the first solder pad via wires. The other end of capacitor C3 is electrically connected to the first solder pad via wires. The other end of resistor R1 is electrically connected to the control chip pin 14 via wires. Pin 3 of the chip is electrically connected. The positive terminal of diode D2 is electrically connected to pin 6 of the control chip via a wire. Pin 4 of the control chip is electrically connected to pin 5 of the control chip, the output terminal of the three-terminal regulator, and one end of capacitor C9 via wires. The common terminal of the three-terminal regulator and the other end of capacitor C9 are electrically connected to the first solder pad via wires. The input terminal of the three-terminal regulator is electrically connected to the fourth solder pad via a wire. Pin 7 of the control chip is electrically connected to the first solder pad via a wire.
8. Electrical connections are established via wires to one end of resistor R4, one end of resistor R15, pin 12 of the control chip, and pin 13 of the control chip, respectively. The other end of resistor R4 is electrically connected via a wire to the negative terminal of diode D4. The positive terminal of diode D4 is electrically connected via wires to one end of capacitor C4, the other end of resistor R15, pin 9 of the control chip, and the positive terminal of diode D3, respectively. The other end of capacitor C4 is electrically connected via a wire to the first solder pad. The negative terminal of diode D3 is electrically connected via a wire to pin 13 of the control chip. 0 achieves electrical connection. The output terminal of the three-terminal Zener diode is electrically connected to pin 14 of the control chip through a wire. Pin 11 of the control chip is electrically connected to one end of resistor R12 in the reversing alarm circuit through a wire. The second solder piece (5) is electrically connected to the positive terminal of diode D10 in the reversing alarm circuit (1) through a wire. The third solder piece (6) is electrically connected to one end of resistor R16 through a wire, and the other end of resistor R16 is electrically connected to the positive terminal of diode D6 in the alarm sound amplification circuit (3) through a wire.
2. The vehicle reversing alarm detection and control circuit according to claim 1, characterized in that: The base terminal of transistor Q1 in the alarm sound amplification circuit (3) is electrically connected to one end of resistor R9 via a wire, and the other end of resistor R9 is electrically connected to one end of resistor R10 and one end of capacitor C5 via a wire. The other end of resistor R10 is electrically connected to the negative terminal of Zener diode via a wire. The other end of capacitor C5 and the positive terminal of Zener diode are electrically connected to the first solder pad via wires. The emitter terminal of transistor Q1 is electrically connected to one end of capacitor C6 via a wire, and the other end of capacitor C6 is electrically connected to the first solder pad via a wire. The emitter terminal of transistor Q1 is electrically connected to the fourth solder pad via a wire. The collector terminal of transistor Q1 is electrically connected to one end of resistor R7 and the positive terminal of polarized capacitor E1 via a wire. The negative terminal of polarized capacitor E1 is electrically connected to the first solder pad via a wire. The other end of resistor R7 is electrically connected to one end of resistor R6 via a wire, and the other end of resistor R6 is electrically connected to the negative terminal of diode D6 via a wire.
3. The vehicle reversing alarm detection and control circuit according to claim 1, characterized in that: In the reversing alarm circuit (1), the negative terminal of diode D10 is electrically connected to one end of resistor R17 via a wire. The other end of resistor R17 is electrically connected to the base of transistor Q3 and one end of resistor R18 via wires. The collector of transistor Q3 is electrically connected to one end of resistor R19 and the base of transistor Q2 via wires. The other end of resistor R18, the emitter of transistor Q3, and the emitter of transistor Q2 are electrically connected to the first solder pad via wires. The collector of transistor Q2 is electrically connected to one end of resistor R20 and the gate of field-effect transistor M2 via wires. The other ends of resistor R20 and resistor R19 are electrically connected to the fourth solder pad via wires. The drain of field-effect transistor M2 is electrically connected to one end of the buzzer and one end of resistor R13 via wires. The other end of resistor R13 and the source terminal of field-effect transistor M2 are electrically connected to the first solder pad via wires. The other end of the buzzer is electrically connected to one end of resistor R11 and the negative terminal of diode D8 via wires. The other end of resistor R11 is electrically connected to the positive terminal of diode D9 via wires. The negative terminal of diode D9 is electrically connected to the positive terminal of diode D8, the negative terminal of diode D7, and the drain terminal of field-effect transistor M1 via wires. The positive terminal of diode D7 is electrically connected to one end of resistor R8 and one end of inductor L1 via wires. The other end of resistor R8 and the other end of inductor L1 are electrically connected to the fourth solder pad via wires. The source terminal of field-effect transistor M1 is electrically connected to the first solder pad via wires, and the gate terminal of field-effect transistor M1 is electrically connected to the other end of resistor R12 via wires.
4. The vehicle reversing alarm detection and control circuit according to claim 1, characterized in that: The control chip is model 74HC132D.
5. A reversing alarm, comprising an alarm housing (8) and a circuit board (9), wherein the circuit board (9) is installed inside the alarm housing (8), characterized in that: The circuit board (9) is provided with any of the vehicle reversing alarm detection and control circuits as described in claims 1-4.
6. A reversing alarm according to claim 5, characterized in that: The first welding piece (4), the second welding piece (5), the third welding piece (6) and the fourth welding piece (7) are fixedly installed side by side on the alarm housing (8), and the outer ends of the first welding piece (4), the second welding piece (5), the third welding piece (6) and the fourth welding piece (7) all extend out of the alarm housing (8).