Buzzer gradual sound control circuit and device

Abstract

The utility model discloses a buzzer gradual sound control circuit and a buzzer gradual sound control device. The buzzer gradual sound control circuit comprises a main control module, a power supply management module, a detection driving module, a signal processing module and a buzzer driving module. The power supply management module is electrically connected with the main control module, the detection driving module, the signal processing module and the buzzer driving module respectively; the main control module is electrically connected with the detection driving module and the buzzer driving module, the detection driving module is electrically connected with the signal processing module, and the signal processing module is electrically connected with the main control module. According to the utility model, the driving of the buzzer can be controlled so as to achieve a gradual sounding effect, thereby preventing sudden alarm sound from frightening people at a short distance, and improving the user experience.

Description

Technical Field

[0001] The utility model relates to the technical field of fire fighting, in particular to a buzzer gradual sounding control circuit and a device. Background Art

[0002] Independent fire detectors are used to send out sound and light signal alarms when they detect smoke concentrations higher than the preset concentration threshold, reminding people to evacuate in time and extinguish the source, take measures to protect themselves and their property, and minimize losses.

[0003] In the prior art, when the fire detection alarm detects that the smoke concentration reaches a certain threshold, the controller controls the fire detection alarm to emit an alarm sound. When the fire detection alarm is working, the sound emitted by its buzzer is sharp and sudden. However, in some relatively quiet application scenarios such as nursing homes and hospitals, when a fire occurs, the high-decibel sound emitted by the buzzer is more likely to disturb people's thoughts, scare people, and even cause irreversible physical damage to people's eardrums. Therefore, inventing a reliable buzzer gradual sound control circuit and device is a problem that needs to be solved urgently by technicians in this field. Utility Model Content

[0004] The purpose of the present application is to provide a buzzer gradual sound control circuit and device. In this scheme, the gradual sound control of the buzzer can be realized, so that when the fire alarm is triggered, the sound pressure of the buzzer is increased rapidly to sound an alarm, so as to avoid scaring people in close proximity and reduce damage to the eardrum, thereby meeting the application needs of more scenarios.

[0005] In order to solve the above technical problems, the present application provides a buzzer gradual sound control circuit, including a main control module, a power management module, a detection drive module, a signal processing module and a buzzer drive module;

[0006] The power management module is electrically connected to the main control module, the detection drive module, the signal processing module and the buzzer drive module respectively;

[0007] The main control module is electrically connected to the detection driving module and the buzzer driving module respectively, the detection driving module is electrically connected to the signal processing module, and the signal processing module is electrically connected to the main control module.

[0008] Preferably, the buzzer driving module includes a driving unit, a first PWM control unit, a second PWM control unit and a buzzer;

[0009] The driving unit is electrically connected to the first PWM control unit, the second PWM control unit and the buzzer respectively, the first PWM control unit is electrically connected to the power management module and the main control module respectively, and the second PWM control unit is electrically connected to the buzzer and the main control module respectively.

[0010] Preferably, the first PWM control unit includes a first transistor and a second transistor;

[0011] The base of the first transistor is electrically connected to the main control module, the emitter of the first transistor is grounded, the collector of the first transistor is electrically connected to the base of the second transistor and the main control module respectively, the emitter of the second transistor is electrically connected to the power management module, and the collector of the second transistor is grounded.

[0012] Preferably, the first PWM control unit further includes a first resistor, a second resistor, a third resistor and a fourth resistor;

[0013] The first end of the first resistor is electrically connected to the base of the first transistor, the second end of the first resistor is grounded, the first end of the second resistor is electrically connected to the first end of the third resistor and the collector of the first transistor respectively, the second end of the second resistor is electrically connected to the base of the second transistor, the second end of the third resistor is electrically connected to the first end of the fourth resistor, the driving unit and the collector of the second transistor respectively, and the second end of the fourth resistor is grounded.

[0014] Preferably, the second PWM control unit includes a third transistor;

[0015] The base of the third transistor is electrically connected to the main control module, the emitter of the third transistor is grounded, and the collector of the third transistor is electrically connected to the buzzer and the driving unit respectively.

[0016] Preferably, the second PWM control unit further includes a fifth resistor and a sixth resistor;

[0017] The first end of the fifth resistor is electrically connected to the main control module, the second end of the fifth resistor is electrically connected to the first end of the sixth resistor and the base of the third transistor respectively, and the second end of the sixth resistor is grounded.

[0018] Preferably, the detection driving module includes a fourth triode, a photoelectric emission tube and a first diode;

[0019] The anode of the first diode is electrically connected to the main control module, the cathode of the first diode is electrically connected to the base of the fourth transistor, the emitter of the fourth transistor is grounded, the collector of the fourth transistor is electrically connected to the cathode of the photoelectric transmitting tube, and the anode of the photoelectric transmitting tube is electrically connected to the power management module.

[0020] Preferably, the detection driving module further includes a seventh resistor and an eighth resistor;

[0021] The first end of the seventh resistor is electrically connected to the main control module, the second end of the seventh resistor is electrically connected to the base of the fourth transistor, the first end of the eighth resistor is electrically connected to the emitter of the fourth transistor, and the second end of the eighth resistor is grounded.

[0022] Preferably, the signal processing module includes a photoelectric receiving unit, a first amplifying unit and a second amplifying unit;

[0023] The photoelectric receiving unit is electrically connected to the power management module, the first amplifying unit is electrically connected to the photoelectric receiving unit, and the second amplifying unit is electrically connected to the power management module, the first amplifying unit and the main control module respectively.

[0024] In order to solve the above technical problems, the present application provides a buzzer gradual loudness control device, including the above buzzer gradual loudness control circuit.

[0025] The utility model discloses a buzzer gradual loudness control circuit and has the following beneficial effects. The utility model discloses a buzzer gradual loudness control circuit including a main control module, a power management module, a detection drive module, a signal processing module and a buzzer drive module; the power management module is electrically connected to the main control module, the detection drive module, the signal processing module and the buzzer drive module respectively; the main control module is electrically connected to the detection drive module and the buzzer drive module respectively, the detection drive module is electrically connected to the signal processing module, and the signal processing module is electrically connected to the main control module. Therefore, the utility model can control the buzzer drive to achieve a gradual loudness effect, avoid sudden alarm sounds from scaring people in close proximity, and improve user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0027] Figure 1This is a schematic diagram of the principle of a buzzer gradual sound control circuit of a preferred embodiment of the utility model;

[0028] Figure 2 It is a circuit diagram of a power management module of a buzzer gradual sound control circuit in a preferred embodiment of the utility model;

[0029] Figure 3 It is a circuit diagram of a buzzer driving module of a buzzer gradual sound control circuit in a preferred embodiment of the utility model;

[0030] Figure 4 It is a circuit diagram of a detection drive module of a buzzer gradual sound control circuit in a preferred embodiment of the utility model;

[0031] Figure 5 The utility model is a circuit diagram of a signal processing module of a buzzer gradual sound control circuit in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0032] The core of this application is to provide a buzzer gradual sound control circuit and device. In this solution, the gradual sound control of the buzzer can be realized, so that when a fire alarm is triggered, the sound pressure of the buzzer is increased rapidly to sound an alarm, so as to avoid scaring people in close proximity and reduce damage to the eardrum, thereby meeting the application needs of more scenarios.

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] See also Figure 1 , Figure 1 A schematic block diagram of a buzzer gradual sound control circuit provided in the present application, comprising a main control module 1, a power management module 2, a detection and driving module 3, a signal processing module 4 and a buzzer driving module 5;

[0035] The power management module 2 is electrically connected to the main control module 1, the detection drive module 3, the signal processing module 4 and the buzzer drive module 5 respectively;

[0036] The main control module 1 is electrically connected to the detection driving module 3 and the buzzer driving module 5 respectively, the detection driving module 3 is electrically connected to the signal processing module 4 , and the signal processing module 4 is electrically connected to the main control module 1 .

[0037] In the prior art, when the fire detection alarm detects that the smoke concentration reaches a certain threshold, the controller controls the fire detection alarm to sound an alarm. When the fire detection alarm is working, the sound emitted by its buzzer is sharp and sudden. However, in some relatively quiet application scenarios such as nursing homes and hospitals, when a fire occurs, the high-decibel sound emitted by the buzzer is more likely to disturb people's thoughts, scare people, and even cause irreversible physical damage to people's eardrums.

[0038] In view of the above shortcomings, in the present application, the buzzer gradual alarm control is realized through the cooperation of the main control module 1, the power management module 2, the detection drive module 3, the signal processing module 4 and the buzzer drive module 5.

[0039] Specifically, in this embodiment, the fire detector works periodically through the timing of the internal timer of the main control module 1. The main control module 1 is used to enable the smoke detection function of the smoke sensor after reaching the smoke detection task cycle.

[0040] Specifically, the detection driving module 3 is turned on after detecting the smoke signal, so that the detection unit in the detection driving module 3 works, and the smoke signal is transmitted to the signal processing module 4 through the detection driving module 3. The signal processing module 4 receives the smoke signal and amplifies the smoke signal and then transmits it to the main control module 1. The main control module 1 obtains the ADC sampling value of the smoke signal. If the ADC sampling value of the smoke signal is greater than the ADC value set for the fire alarm, it is determined that the current state is a fire alarm, and the main control module 1 controls the buzzer driving module 5 to output a gradually sounding alarm.

[0041] Specifically, the main control module 1 is set as an MCU (Microcontroller Unit, also known as a single chip microcomputer) or a single chip microcomputer, which appropriately reduces the frequency and specifications of the central processing unit (CPU), and integrates peripheral interfaces such as memory, timer, USB, A / D conversion, UART, PLC, DMA, and even LCD drive circuits on a single chip to form a chip-level computer. In this embodiment, the chip model of the main control module 1 is not specifically limited.

[0042] In summary, the present application provides a buzzer gradual sound control circuit, which includes a main control module 1, a power management module 2, a detection drive module 3, a signal processing module 4 and a buzzer drive module 5; the power management module 2 is electrically connected to the main control module 1, the detection drive module 3, the signal processing module 4 and the buzzer drive module 5 respectively; the main control module 1 is electrically connected to the detection drive module 3 and the buzzer drive module 5 respectively, the detection drive module 3 is electrically connected to the signal processing module 4, and the signal processing module 4 is electrically connected to the main control module 1. Therefore, the utility model can control the buzzer drive to achieve a gradual sound effect, avoid the sudden alarm sound from scaring people in close proximity, and improve the user experience.

[0043] Based on the above embodiments:

[0044] Please refer to Figure 2 , Figure 2 A circuit schematic diagram of a power management module provided in this application.

[0045] Specifically, in this embodiment, the power management module 2 is provided with a boost circuit.

[0046] Specifically, see Figure 2 When the smoke detection function is not started, the main control module 1 maintains a low level for Power_EN, that is, the fifth transistor Q17 is not turned on, the voltage of capacitor C50 is VCC voltage, and V_blue is equal to VDD; when the smoke detection function is started, the main control module 1 outputs a high level for Power_EN, thereby enabling the control of the fifth transistor Q17 to turn on, and at the same time, the VSD of MOS tube Q16 is turned on. Due to the characteristics of the capacitor, the voltage cannot change suddenly, the voltage of capacitor C50 remains at VDD, and the voltage at one end of capacitor C50 is already POWER_IR voltage, so the voltage at the other end of capacitor C50 becomes VDD+POWER_IR, that is, V_blue is equal to VDD+POWER_IR, thereby achieving the purpose of boosting.

[0047] Please refer to Figure 3 , Figure 3 A circuit schematic diagram of a buzzer driving module provided in this application.

[0048] As a preferred embodiment, the buzzer driving module 5 includes a driving unit 61, a first PWM control unit 62, a second PWM control unit 63 and a buzzer;

[0049] The driving unit 61 is electrically connected to the first PWM control unit 62, the second PWM control unit 63 and the buzzer respectively, the first PWM control unit 62 is electrically connected to the power management module 2 and the main control module 1 respectively, and the second PWM control unit 63 is electrically connected to the buzzer and the main control module 1 respectively.

[0050] As a preferred embodiment, the first PWM control unit 62 includes a first transistor Q13 and a second transistor Q15;

[0051] The base of the first transistor Q13 is electrically connected to the main control module 1, the emitter of the first transistor Q13 is grounded, the collector of the first transistor Q13 is electrically connected to the base of the second transistor Q15 and the main control module 1 respectively, the emitter of the second transistor Q15 is electrically connected to the power management module 2, and the collector of the second transistor Q15 is grounded.

[0052] As a preferred embodiment, the first PWM control unit 62 further includes a first resistor R41, a second resistor R65, a third resistor R77 and a fourth resistor R33;

[0053] The first end of the first resistor R41 is electrically connected to the base of the first transistor Q13, the second end of the first resistor R41 is grounded, the first end of the second resistor R65 is electrically connected to the first end of the third resistor R77 and the collector of the first transistor Q13, the second end of the second resistor R65 is electrically connected to the base of the second transistor Q15, the second end of the third resistor R77 is electrically connected to the first end of the fourth resistor R33, the driving unit 61 and the collector of the second transistor Q15, and the second end of the fourth resistor R33 is grounded.

[0054] As a preferred embodiment, the second PWM control unit 63 includes a third transistor Q11;

[0055] The base of the third transistor Q11 is electrically connected to the main control module 1 , the emitter of the third transistor Q11 is grounded, and the collector of the third transistor Q11 is electrically connected to the buzzer and the driving unit 61 , respectively.

[0056] As a preferred embodiment, the second PWM control unit 63 further includes a fifth resistor R42 and a sixth resistor R43;

[0057] The first end of the fifth resistor R42 is electrically connected to the main control module 1 , the second end of the fifth resistor R42 is electrically connected to the first end of the sixth resistor R43 and the base of the third transistor Q11 , respectively, and the second end of the sixth resistor R43 is grounded.

[0058] Specifically, in the buzzer driving module, VDD is used as the power supply of the driving unit 61, and the main control module 1 outputs a high level to the IRPower_EN enable port of U2 in the driving unit 61 to control the action of U2. B1 is a passive buzzer, and the main control module 1 needs to control the first transistor Q13 and the second transistor Q15 to conduct through MCU_PWM to input the oscillation source to the passive buzzer B1. Therefore, the present application controls the duty cycle and frequency of the first PWM waveform output in the first PWM control unit 62 to control the passive buzzer B1 to output different sound pressures.

[0059] Specifically, when the passive buzzer B1 operates at a non-resonant frequency, the sound it emits becomes sharp and harsh. In the present application, the main control module 1 outputs a second PWM waveform to the second PWM control unit 63 through BEEP_DOWM, and adjusts the conduction of the third transistor Q11 to control the voltage amplitude of the passive buzzer B1, thereby further controlling the sound pressure output by the buzzer. Therefore, the present application controls the duty cycle, frequency, and voltage amplitude of the passive buzzer B1 through two PWM waveforms, so that the buzzer achieves a gradually louder effect.

[0060] Please refer to Figure 4 , Figure 4 A circuit schematic diagram of a detection drive module provided in this application.

[0061] As a preferred embodiment, the detection driving module 3 includes a fourth transistor Q18, a photoelectric emission tube H4 and a first diode D2;

[0062] The anode of the first diode D2 is electrically connected to the main control module 1, the cathode of the first diode D2 is electrically connected to the base of the fourth transistor Q18, the emitter of the fourth transistor Q18 is grounded, the collector of the fourth transistor Q18 is electrically connected to the cathode of the photoelectric emission tube H4, and the anode of the photoelectric emission tube H4 is electrically connected to the power management module 2.

[0063] As a preferred embodiment, the detection driving module 3 further includes a seventh resistor R88 and an eighth resistor R90;

[0064] The first end of the seventh resistor R88 is electrically connected to the main control module 1, the second end of the seventh resistor R88 is electrically connected to the base of the fourth transistor Q18, the first end of the eighth resistor R90 is electrically connected to the emitter of the fourth transistor Q18, and the second end of the eighth resistor R90 is grounded.

[0065] Please refer to Figure 5 , Figure 5 A circuit schematic diagram of a signal processing module provided in this application.

[0066] As a preferred embodiment, the signal processing module 4 includes a photoelectric receiving unit 51, a first amplifying unit 52 and a second amplifying unit 53;

[0067] The photoelectric receiving unit 51 is electrically connected to the power management module 2 , the first amplifying unit 52 is electrically connected to the photoelectric receiving unit 51 , and the second amplifying unit 53 is electrically connected to the power management module 2 , the first amplifying unit 51 and the main control module 1 , respectively.

[0068] Specifically, in this embodiment, in the detection drive circuit, the main control module 1 outputs a high level through blue_START, thereby controlling the fourth transistor Q18 to be turned on, so that the photoelectric emission tube H4 works.

[0069] Specifically, in this embodiment, the H3 receiving tube in the photoelectric receiving unit 51 is turned on after receiving the infrared light from the H4 photoelectric tube, and is amplified by the operational amplifier circuit composed of the first amplifying unit 52 and the second amplifying unit 53 and then sent to the INPUT end of the MCU. The INPUT input is the ADC sampling value. If the ADC value of the current detection sampling is greater than the ADC value set for the fire alarm, the detector determines that the current state is a fire alarm.

[0070] The present application also provides a buzzer gradual-sounding control device, comprising the buzzer gradual-sounding control circuit described above.

[0071] For an introduction to a buzzer gradual sound control circuit provided in the present application, please refer to the above-mentioned embodiment, and the present application will not go into details here.

[0072] It should be noted that, in this specification, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0073] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A buzzer gradual sound control circuit, characterized in that: It includes a main control module, a power management module, a detection drive module, a signal processing module and a buzzer drive module; The power management module is electrically connected to the main control module, the detection drive module, the signal processing module and the buzzer drive module respectively; The main control module is electrically connected to the detection driving module and the buzzer driving module respectively, the detection driving module is electrically connected to the signal processing module, and the signal processing module is electrically connected to the main control module.

2. A buzzer gradual sound control circuit according to claim 1, characterized in that: The buzzer driving module includes a driving unit, a first PWM control unit, a second PWM control unit and a buzzer; The driving unit is electrically connected to the first PWM control unit, the second PWM control unit and the buzzer respectively, the first PWM control unit is electrically connected to the power management module and the main control module respectively, and the second PWM control unit is electrically connected to the buzzer and the main control module respectively.

3. A buzzer gradual sound control circuit according to claim 2, characterized in that: The first PWM control unit includes a first transistor and a second transistor; The base of the first transistor is electrically connected to the main control module, the emitter of the first transistor is grounded, the collector of the first transistor is electrically connected to the base of the second transistor and the main control module respectively, the emitter of the second transistor is electrically connected to the power management module, and the collector of the second transistor is grounded.

4. A buzzer gradual sound control circuit according to claim 3, characterized in that: The first PWM control unit further includes a first resistor, a second resistor, a third resistor and a fourth resistor; The first end of the first resistor is electrically connected to the base of the first transistor, the second end of the first resistor is grounded, the first end of the second resistor is electrically connected to the first end of the third resistor and the collector of the first transistor respectively, the second end of the second resistor is electrically connected to the base of the second transistor, the second end of the third resistor is electrically connected to the first end of the fourth resistor, the driving unit and the collector of the second transistor respectively, and the second end of the fourth resistor is grounded.

5. A buzzer gradual sound control circuit according to claim 2, characterized in that: The second PWM control unit includes a third transistor; The base of the third transistor is electrically connected to the main control module, the emitter of the third transistor is grounded, and the collector of the third transistor is electrically connected to the buzzer and the driving unit respectively.

6. A buzzer gradual sound control circuit according to claim 5, characterized in that: The second PWM control unit also includes a fifth resistor and a sixth resistor; The first end of the fifth resistor is electrically connected to the main control module, the second end of the fifth resistor is electrically connected to the first end of the sixth resistor and the base of the third transistor respectively, and the second end of the sixth resistor is grounded.

7. A buzzer gradual sound control circuit according to claim 1, characterized in that: The detection driving module includes a fourth triode, a photoelectric transmitting tube and a first diode; The anode of the first diode is electrically connected to the main control module, the cathode of the first diode is electrically connected to the base of the fourth transistor, the emitter of the fourth transistor is grounded, the collector of the fourth transistor is electrically connected to the cathode of the photoelectric transmitting tube, and the anode of the photoelectric transmitting tube is electrically connected to the power management module.

8. A buzzer gradual sound control circuit according to claim 7, characterized in that: The detection driving module also includes a seventh resistor and an eighth resistor; The first end of the seventh resistor is electrically connected to the main control module, the second end of the seventh resistor is electrically connected to the base of the fourth transistor, the first end of the eighth resistor is electrically connected to the emitter of the fourth transistor, and the second end of the eighth resistor is grounded.

9. A buzzer gradual sound control circuit according to claim 1, characterized in that: The signal processing module includes a photoelectric receiving unit, a first amplifying unit and a second amplifying unit; The photoelectric receiving unit is electrically connected to the power management module, the first amplifying unit is electrically connected to the photoelectric receiving unit, and the second amplifying unit is electrically connected to the power management module, the first amplifying unit and the main control module respectively.

10. A buzzer gradual sound control device, characterized in that: A buzzer gradual sound control circuit comprising any one of claims 1 to 9.

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