Alarm buzzer suitable for hovercar

Abstract

The invention relates to the technical field of buzzers, in particular to an alarm buzzer suitable for an aerocar, which comprises a working circuit and a buzzer connected with the working circuit, wherein the working circuit comprises a control circuit, a fundamental frequency circuit, a power supply circuit, a power module circuit and a protection FET circuit; the control circuit is respectively connected with the fundamental frequency circuit, the power supply circuit and the protection FET circuit, and the power supply circuit and the protection FET circuit are also connected with the power module circuit; and a buzzer is arranged beside the power module circuit. By improving the circuit structure, the performance defect of an existing alarm buzzer in an aerocar application scene is overcome, the technical effects that the alarm sound pressure level is larger than or equal to 110dB at 1m, the frequency response range is 2-3KHz, and the high and low temperature (-40 DEG C to 90 DEG C) performance attenuation is smaller than or equal to 5% are achieved, and the multi-scene alarm requirement of an aerocar can be accurately met.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of automobile accessories, and particularly relates to a warning buzzer suitable for a flying automobile. BACKGROUND

[0002] As a new type of transportation tool with the functions of ground driving and low-altitude flying, the flying automobile has a more complex running environment than traditional automobiles, and needs to face harsh conditions such as high-altitude low air pressure, wide temperature fluctuation of-40 DEG C to 85 DEG C, strong vibration (acceleration can reach more than 15G) generated by the engine and propeller, and electromagnetic interference. As a core safety component of the flying automobile, the warning buzzer is responsible for sending an explicit warning signal in dangerous scenarios such as power system failure, battery abnormality, and unbalanced flight attitude, and its performance reliability is directly related to the safety of the driver and passengers.

[0003] The existing traditional automobile warning buzzer cannot meet the special needs of the flying automobile, and mainly has the following technical defects: firstly, the acoustic directivity is poor, the traditional buzzer adopts omnidirectional sound emission design, and in the complex acoustic environment of the flying automobile cockpit, the warning sound propagation is easy to be scattered, leading to delayed recognition of the driver; secondly, the environmental adaptability is insufficient, the magnetic energy product of ordinary magnetic steel decays by more than 15% in the alternating environment of high and low temperature, and the diaphragm and support structure are easy to be damaged due to vibration fatigue; thirdly, the anti-interference ability is weak, the electromagnetic interference generated by the motor, radar and other equipment of the flying automobile can cause the buzzer to be mis-triggered or the sound to be distorted; fourthly, the response speed is slow, the response delay of the traditional driving circuit is more than 5ms, which cannot meet the millisecond-level emergency warning needs of the flying automobile.

[0004] In view of the above problems, although the existing technology has a scheme of increasing the sound emission power to improve the warning sound pressure, the directivity problem is not solved, and the power increase leads to increased heat dissipation and energy consumption; there is also a try of using a simple sealing structure to enhance protection, but it cannot balance the anti-vibration and acoustic performance. Therefore, it is a key bottleneck for the design of the safety system of the flying automobile to develop a high-performance warning buzzer with strong directivity, wide temperature stability, anti-vibration and anti-interference, and fast response. SUMMARY

[0005] The purpose of the present application is to provide a warning buzzer suitable for a flying automobile, which overcomes the performance defects of the existing warning buzzer in the application scenario of the flying automobile by improving the circuit structure, realizes the technical effects of warning sound pressure level ≥110dB@1m, frequency response range 2-3KHz, and performance attenuation ≤5% at high and low temperatures (-40 DEG C to 90 DEG C), and can accurately adapt to the multi-scenario warning needs of the flying automobile.

[0006] The above purpose is realized by the following technical scheme:

[0007] The application discloses an alarm buzzer suitable for a flying car, which comprises a working circuit and a buzzer connected with the working circuit; wherein the working circuit comprises a control circuit, a basic frequency circuit, a power supply circuit, a power module circuit and a protection FET circuit; the control circuit is connected with the basic frequency circuit, the power supply circuit and the protection FET circuit respectively; the power supply circuit and the protection FET circuit are further connected with the power module circuit; and the power module circuit is provided with the buzzer.

[0008] One end of the basic frequency circuit is connected with the power supply circuit, and the other end is connected with the control circuit; the basic frequency circuit comprises a bidirectional diode T1, a resistor R4, a resistor R5 and a capacitor C1; the input end of the bidirectional diode T1 is connected with the power supply circuit and the control circuit respectively; the output end of the bidirectional diode T1 is connected with the capacitor C2 after being connected with the resistor R4 and the resistor R5 in series respectively, and then grounded GND; and the capacitor C2 is further connected with the control circuit; the basic frequency circuit can adjust the output frequency and duty cycle by adjusting the resistor and the capacitor.

[0009] The power supply circuit comprises an external resistor R12, a resistor R13, a capacitor C3 and a voltage stabilizing tube D1; one end of the resistor R12 and the resistor R13 in parallel is connected with the basic frequency circuit and the anti-reverse diode D3 respectively; the anti-reverse diode D3 is connected with a +12V power supply; the other end of the resistor R12 and the resistor R13 in parallel is connected with the control circuit, and then grounded GND after being connected with the capacitor C3 and the voltage stabilizing tube D1 in parallel; the power supply circuit limits the chip power supply voltage by the external resistor R12, R13 and the voltage stabilizing tube D1, so as to protect the chip.

[0010] The resistor R3 is further connected in series between the basic frequency circuit and the power supply circuit.

[0011] The control circuit comprises a control chip U1, a capacitor C1, a resistor R4, a resistor R5 and an external capacitor C2; the common end points of the capacitor C1, the resistor R4 and the resistor R5 are connected with the TRIG pin and the THR pin of the control chip U1 through the leading wires respectively; the DIS pin of the control chip U1 is connected with the input end of the bidirectional diode T1 of the basic frequency circuit; the R pin and the VCC pin of the control chip U1 are connected with the external resistor R12 and the resistor R13 of the power supply circuit; the Cout pin of the control chip U1 is grounded GND through the capacitor C1; the GND pin of the control chip U1 is grounded; and the Vo pin of the control chip U1 is connected with the protection FET circuit. In the multi-resonance oscillation working mode, the frequency and the duty cycle are independently controlled by adjusting the two external resistors R4 and R5 and the external capacitor C2; the threshold value and the trigger level are two-thirds and one-third of VCC respectively.

[0012] The control chip U1 adopts a 555 chip.

[0013] The protection FET circuit comprises a discharge resistor R9, one end of which is connected with the power module and the other end of which is grounded GND.

[0014] The power module comprises an electronic switch T2 and a transformer L1; the electronic switch T2 adopts an N-channel MOS tube, the gate G of the N-channel MOS tube is connected with a discharge resistor R9 of a protection FET circuit, the source S of the N-channel MOS tube is grounded GND, the drain D of the N-channel MOS tube is connected with a pin 1 of one side of the transformer L1 as an output end, a pin 3 of one side of the transformer L1 is connected with a power supply circuit, and the other side of the transformer L1 is connected with a buzzer. The power module realizes high sound pressure level driving of the buzzer through amplification of a signal of the transformer.

[0015] The Vo pin of the control chip U1 of the control circuit is further connected with the gate G of the N-channel MOS tube after being connected with the resistor R8 in series.

[0016] The resistor adopts a patch resistor, and the capacitor adopts a ceramic capacitor.

[0017] The present application has the following advantages and benefits:

[0018] 1. According to the principle of the buzzer itself, the optimal frequency band 2-3KHZ of the buzzer is displayed. The advantages are that the output frequency and duty cycle are simple and adjustable, and the sound state is adjusted according to different scenes and requirements.

[0019] 2. The present application overcomes the performance defects of the existing alarm buzzer in the application scene of the flying car through improvement of the circuit structure, realizes the technical effects of alarm sound pressure level ≥110dB@1m, frequency response range 2-3KHz, and performance attenuation ≤5% of high and low temperature (-40℃~90℃), and can accurately adapt to the multi-scene alarm demand of the flying car. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the circuit schematic diagram of the present application. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation method of the present application is described in detail below. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific implementation disclosed below.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The present application is further described in detail below with reference to the drawings and examples.

[0023] As Figure 1 shown, the circuit schematic diagram of the present application. The present application provides an embodiment: a warning buzzer for flying car, including working circuit and connected with the buzzer; wherein, the working circuit includes control circuit, base frequency circuit, power supply circuit, power module circuit, protection FET circuit; the control circuit is connected with base frequency circuit, power supply circuit, protection FET circuit respectively, the power supply circuit, protection FET circuit is also connected with power module circuit; power module circuit side is equipped with buzzer. The specific structure is as follows:

[0024] Control circuit

[0025] The connection relationship includes: control chip U1, capacitor C1, resistor R4, resistor R5 and an external capacitor C2; the common terminal of capacitor C1, resistor R4 and resistor R5 is connected with the TRIG pin and THR pin of control chip U1 respectively, the DIS pin of control chip U1 is connected with the input end of base frequency circuit bidirectional diode T1, the R pin and VCC pin of control chip U1 are connected with external resistor R12 and resistor R13 of power supply circuit, the Cout pin of control chip U1 is connected with ground GND through capacitor C1, the GND pin of control chip U1 is grounded, and the Vo pin of control chip U1 is connected with protection FET circuit. The Vo pin of control chip U1 is also connected with power module circuit after connecting resistor R8 in series.

[0026] The working principle of control circuit: control chip U1, in the multi-resonance mode, the frequency and duty cycle can be controlled independently by adjusting two external resistors R4, R5 and an external capacitor C2. The threshold and trigger level are usually two-thirds and one-third of VCC respectively.

[0027] Base frequency circuit

[0028] The connection relationship includes: one end is connected with power supply circuit, and the other end is connected with control circuit; the base frequency circuit includes bidirectional diode T1, resistor R4, resistor R5 and capacitor C1; the input end of bidirectional diode T1 is connected with power supply circuit and control circuit respectively, the output end of bidirectional diode T1 is connected with ground GND after connecting resistor R4 and resistor R5 in series and connecting capacitor C2, and capacitor C2 is also connected with control circuit; there is also resistor R3 connected in series between base frequency circuit and power supply circuit.

[0029] The working principle of base frequency circuit: mainly composed of BAV199, R4, R5 and C2, so that the output frequency and duty cycle are simple and adjustable.

[0030] Power supply circuit

[0031] The connection relationship comprises: external resistance R12, resistance R13, capacitor C3 and voltage stabilizing tube D1; the one end of the parallel connection of resistance R12 and resistance R13 is connected with the base frequency circuit and anti-reverse diode D3 respectively, the anti-reverse diode D3 is connected to +12V power supply, the other end of the parallel connection of resistance R12 and resistance R13 is connected with the control circuit, and is further connected with capacitor C3 and voltage stabilizing tube D1 in parallel and then connected with ground GND.

[0032] The working principle of the power supply circuit is as follows: the chip supply voltage is limited through external resistance R12, R13 and voltage stabilizing tube D1, so as to achieve the purpose of protecting the chip.

[0033] Power module circuit

[0034] The connection relationship comprises: electronic switch T2 and transformer L1; the electronic switch T2 adopts N-channel MOS tube, the gate G of the N-channel MOS tube is connected with the discharge resistance R9 of the protection FET circuit, the source S of the N-channel MOS tube is connected with ground GND, the drain D of the N-channel MOS tube is connected with the pin 1 of one side of the transformer L1 as an output end, the pin 3 of one side of the transformer L1 is connected with the power supply circuit, the other side of the transformer L1 is connected with the buzzer. The Vo pin of the control chip U1 is further connected with the gate G of the N-channel MOS tube in series after connecting with resistance R8.

[0035] The working principle of the power module circuit is as follows: the buzzer is driven to sound through the amplification of the transformer.

[0036] Protection FET circuit

[0037] The connection relationship comprises: one end of the discharge resistance R9 is connected with the power module, and the other end is connected with ground GND.

[0038] In the example, the control chip U1 adopts 555 chip, the bidirectional diode T1 is of BAV199 type, the resistance adopts patch resistance, and the capacitor adopts ceramic capacitor.

[0039] The above description is only the preferred embodiment of the present application, and does not limit the present application, any simple modification, change and equivalent structure change according to the technical essence of the present application to the above embodiment are still within the protection scope of the technical solution of the present application.

Claims

1. An alarm buzzer suitable for flying cars, characterized in that, It includes a working circuit and a buzzer connected thereto; wherein, the working circuit includes a control circuit, a base frequency circuit, a power supply circuit, a power module circuit, and a protection FET circuit; the control circuit is connected to the base frequency circuit, the power supply circuit, and the protection FET circuit respectively, and the power supply circuit and the protection FET circuit are also connected to the power module circuit; a buzzer is provided next to the power module circuit.

2. The alarm buzzer for flying cars according to claim 1, characterized in that, One end of the baseband circuit is connected to the power supply circuit, and the other end is connected to the control circuit. The baseband circuit includes a bidirectional diode T1, a resistor R4, a resistor R5, and a capacitor C1. The input terminals of the bidirectional diode T1 are connected to the power supply circuit and the control circuit respectively. The output terminals of the bidirectional diode T1 are connected in series with resistors R4 and R5, and then connected to capacitor C2 and grounded to GND. Capacitor C2 is also connected to the control circuit. The baseband circuit allows the output frequency and duty cycle to be adjusted by adjusting the resistors and capacitors.

3. The alarm buzzer for flying cars according to claim 1, characterized in that, The power supply circuit includes external resistors R12 and R13, capacitor C3, and Zener diode D1. One end of resistors R12 and R13 connected in parallel is connected to the baseband circuit and the anti-reverse diode D3, respectively. The anti-reverse diode D3 is connected to the +12V power supply. The other end of resistors R12 and R13 connected in parallel is connected to the control circuit, and is also grounded to GND through capacitor C3 and Zener diode D1. The power supply circuit limits the chip's power supply voltage through external resistors R12 and R13 and Zener diode D1 to protect the chip.

4. An alarm buzzer suitable for flying cars according to claim 2 or 3, characterized in that, A resistor R3 is connected in series between the baseband circuit and the power supply circuit.

5. An alarm buzzer for flying cars according to claim 1, characterized in that, The control circuit includes a control chip U1, a capacitor C1, resistors R4 and R5, and an external capacitor C2. The common terminals of capacitors C1, R4, and R5 are connected to the TRIG and THR pins of the control chip U1, respectively. The DIS pin of the control chip U1 is connected to the input of the bidirectional diode T1 in the baseband circuit. The R and VCC pins of the control chip U1 are connected to the external resistors R12 and R13 of the power supply circuit. The Cout pin of the control chip U1 is grounded to GND via capacitor C1. The GND pin of the control chip U1 is grounded. The Vo pin of the control chip U1 is connected to the protection FET circuit. In multivibrator operation mode, the frequency and duty cycle are independently controlled by adjusting the two external resistors R4 and R5 and the external capacitor C2; the threshold and trigger levels are two-thirds and one-third of VCC, respectively.

6. An alarm buzzer for flying cars according to claim 5, characterized in that, The control chip U1 is a 555 chip.

7. An alarm buzzer for flying cars according to claim 1, characterized in that, The protection FET circuit includes a discharge resistor R9, one end of which is connected to the power module and the other end is grounded (GND).

8. An alarm buzzer for flying cars according to claim 1, characterized in that, The power module includes an electronic switch T2 and a transformer L1. The electronic switch T2 uses an N-channel MOSFET. The gate (G) of the N-channel MOSFET is connected to the bleeder resistor R9 of the protection FET circuit. The source (S) of the N-channel MOSFET is grounded to GND. The drain (D) of the N-channel MOSFET serves as the output terminal and is connected to pin 1 on one side of the transformer L1. Pin 3 on one side of the transformer L1 is connected to the power supply circuit. The other side of the transformer L1 is connected to a buzzer. The power module uses the amplified signal from the transformer to drive the buzzer to produce sound at a high sound pressure level.

9. An alarm buzzer suitable for flying cars according to claim 5 or 8, characterized in that, The Vo pin of the control chip U1 in the control circuit is connected in series with resistor R8 and then connected to the gate G of the N-channel MOS transistor.

10. An alarm buzzer suitable for flying cars according to any one of claims 1-9, characterized in that, The resistors are surface mount resistors, and the capacitors are ceramic capacitors.

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