CN114399874A - Audible alarm and method for driving buzzer in audible alarm - Google Patents
Audible alarm and method for driving buzzer in audible alarm Download PDFInfo
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- G08B3/00—Audible signalling systems; Audible personal calling systems
- G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
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- G—PHYSICS
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- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
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Abstract
The invention discloses an audible alarm and a method for driving a buzzer in the audible alarm, wherein the audible alarm comprises the following steps: the signal driving module is connected with a buzzer, the signal driving module periodically outputs a driving signal, and the buzzer sounds according to the received driving signal; the frequency of the driving signal is the same as the resonance frequency of the buzzer; each driving signal is divided into a first driving signal section and a second driving signal section, wherein the duty ratio of the first driving signal section is larger than that of the second driving signal section. The invention has the advantage of greatly reducing power consumption on the premise of ensuring the sound intensity to be unchanged.
Description
Technical Field
The invention relates to the technical field of alarm equipment, in particular to an acoustic alarm and a method for driving a buzzer in the acoustic alarm.
Background
The acoustic alarm of the traditional fire-fighting fire alarm system generally adopts a four-wire wiring connection mode, namely 2 signal wires, and is used for signal transmission between the acoustic alarm and a controller; 2 power cords, the effect is to provide energy for the sounding of the audible alarm by using an independent power supply.
The disadvantages of such four-wire wiring are: engineering cost is higher, except that needing extra wire rod, the wiring still needs to spend the cost of labor, connects 4 lines simultaneously and connects wrong risk great, when the debugging, finds the fault point and rework cost is high.
Therefore, on the basis, a two-wire system sound alarm is developed, namely 2 signal wires, the 2 signal wires are used for carrying out signal transmission on the sound alarm and the controller, energy needs to be provided for sounding of the sound alarm, the two-wire system sound alarm can reduce the cost of a customer in engineering application, and meanwhile, the risk of wrong wiring connection is greatly reduced.
However, the two-wire system acoustic alarm is powered by the controller (driving circuit), and since the controller generally has multiple loops that share the output capacity of the controller capacitor, the acoustic alarm is required to have less power consumption than the four-wire system independent power supply because the current supply capability is smaller. However, the power consumption of the conventional technology is proportional to the sound intensity, i.e., the larger the sound is, the higher the power consumption is, so how to achieve the purpose that the sound intensity of the acoustic alarm meets the standard under the condition of ensuring the small power consumption provided by the two-wire system is a problem which needs to be solved urgently.
Disclosure of Invention
The invention aims to provide an acoustic alarm and a method for driving a buzzer in the acoustic alarm, which can greatly reduce power consumption on the premise of ensuring that the sound intensity is not changed so as to support the application and implementation of a two-wire system.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
an audible alarm, comprising: the signal driving module is connected with the buzzer, the signal driving module periodically outputs a driving signal, and the buzzer sounds according to the received driving signal; the frequency of the driving signal is the same as the resonance frequency of the buzzer; each driving signal is divided into a first driving signal section and a second driving signal section, wherein the duty ratio of the first driving signal section is larger than that of the second driving signal section.
Optionally, the resonance frequency of the buzzer is 20Hz to 20 kHz.
Optionally, the duty ratio of the first driving signal segment is 20% -70%; the duty ratio of the second driving signal section is 5% -20%.
Optionally, the first 10% -40% of the drive signal is the first drive signal segment; the last 60% -90% of the driving signal is the second driving signal segment.
Optionally, the signal driving module includes a driving circuit connected to the single chip microcomputer; the singlechip is used for outputting the driving signal, and the driving circuit drives the buzzer to sound according to the driving signal.
Optionally, the driving circuit comprises: the energy storage capacitor C9 and the inductor L5 are connected with the two-wire system communication line and used for storing voltage from the two-wire system communication line, the inductor L5 is connected to two ends of an interface J1 of the buzzer in parallel and used for releasing stored energy in the form of induced electromotive voltage, and high voltage is generated at two ends of an interface J1 of the buzzer to drive the buzzer to sound.
Optionally, the driving circuit further comprises: a first triode Q2 and a second triode Q3, wherein the emitter of the first triode Q2 is connected with the base of the second triode Q3, and the collector of the first triode Q2 and the collector of the second diode Q3 are respectively connected with the inductor L5; the first triode Q2 and the second triode Q3 are used for conducting and conducting; when the first transistor Q2 and the second transistor Q3 are turned on, the voltage on the energy storage capacitor C9 is stored in the inductor L5 in the form of current; when the first triode Q2 and the second triode Q3 are turned off, the energy stored in the inductor L5 is released in the form of induced electromotive voltage, and the buzzer is driven to sound.
Optionally, when the bases of the first transistor Q2 and the second transistor Q3 receive the first driving signal segment in the driving signal, the total time that the first transistor Q2 and the second transistor Q3 are turned on is the first time period.
When the bases of the first transistor Q2 and the second transistor Q3 receive the second driving signal segment in the driving signal, the total time of the conduction of the first transistor Q2 and the second transistor Q3 is a second time period. The first time period is greater than the second time period.
In another aspect, the present invention provides a method of driving a buzzer in an acoustic alarm, comprising: acquiring the resonance frequency of the buzzer; setting the frequency of a driving signal to be equal to the resonance frequency of the buzzer; setting the driving signals as a first driving signal segment and a second driving signal segment in each frequency period of the driving signals, wherein the duty ratio of the first driving signal segment is greater than that of the second driving signal segment; and generating a periodic driving signal for driving the buzzer to sound.
Optionally, the resonance frequency of the buzzer is 20Hz to 20 kHz.
Optionally, the duty ratio of the first driving signal segment is 20% -70%; the duty ratio of the second driving signal section is 5% -20%.
Optionally, the first 10% -40% of the drive signal is the first drive signal segment; the last 60% -90% of the driving signal is the second driving signal segment.
The invention has at least one of the following advantages:
the invention provides an acoustic alarm, in particular to a two-wire system acoustic alarm, which comprises: the signal driving module periodically outputs a driving signal, and the buzzer sounds according to the received driving signal; the frequency of the driving signal is the same as the resonance frequency of the buzzer; it can be seen that since the buzzer resonant frequency is a self-contained property of its manufacture, the resonance can be generated and the sound is maximized as the frequency of the sound driving the driving signal is consistent with it.
Each drive signal divide into first drive signal section and second drive signal section, wherein the duty cycle of first drive signal section is greater than the duty cycle of second drive signal section, can know from this, the duty cycle of this first drive signal section is bigger, and its mainly used controls the sound intensity that bee calling organ produced accords with the preset standard, the duty cycle of second drive signal section is smaller, and its mainly used reduces the consumption under the prerequisite that bee calling organ lasts to produce sound.
According to the invention, the on-off time proportion of the Q2 and the Q3 is controlled by controlling the duty ratio distribution of the driving signals, namely, when the bases of the first triode Q2 and the second triode Q3 receive the first driving signal section in the driving signals, the total on-time of the first triode Q2 and the second triode Q3 is the first time section, and when the bases of the first triode Q2 and the second triode Q3 receive the second driving signal section in the driving signals, the total on-time of the first triode Q2 and the second triode Q3 is the second time section. Because the duty cycle of first drive signal section is greater than the duty cycle of second drive signal section, then first time quantum is greater than the second time quantum, and from this can know, bee calling organ sends sound time longer at first drive signal section, can guarantee the sound intensity, bee calling organ sends sound short at second drive signal section, can reduce the consumption.
Drawings
Fig. 1 is a main structural block diagram of an acoustic alarm provided in an embodiment of the present invention;
fig. 2 is a schematic circuit structure diagram of a driving circuit of an acoustic alarm according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a waveform structure of a driving signal of an acoustic alarm according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating duty ratios of a first driving signal segment and a second driving signal segment of an acoustic alarm according to an embodiment of the present invention;
fig. 5 is a schematic flowchart of a method for driving a buzzer in an audible alarm according to an embodiment of the present invention.
Detailed Description
The following describes an acoustic alarm and a method for driving a buzzer in the acoustic alarm in further detail with reference to the accompanying drawings and the detailed description. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
As shown in fig. 1 to 4, the present embodiment provides an acoustic alarm apparatus, including: the signal driving module is connected with the buzzer 103, the signal driving module periodically outputs a driving signal, and the buzzer 103 sounds according to the received driving signal; the frequency of the driving signal is the same as the resonance frequency of the buzzer 103; each driving signal is divided into a first driving signal section and a second driving signal section, wherein the duty ratio of the first driving signal section is larger than that of the second driving signal section.
The embodiment provides an acoustic alarm device, because the resonance frequency of the buzzer is the self-contained property of the acoustic alarm device, when the frequency of the sound driving signal is consistent with the resonance frequency, the resonance can be generated, and the sound is maximum. This embodiment is passed through each drive signal divide into first drive signal section and second drive signal section, wherein the duty cycle of first drive signal section is greater than the duty cycle of second drive signal section, can know from this, the duty cycle of this first drive signal section is bigger, its mainly used control the sound intensity that bee calling organ produced accords with the preset standard, the duty cycle of second drive signal section is smaller, its mainly used is under the prerequisite that bee calling organ continuously produced sound, reduces the consumption.
In this embodiment, as shown in fig. 3, since the resonance frequency of the buzzer is 20Hz to 20kHz, which is a sensitive frequency band of human ears, the sound emitted by the buzzer is captured by human ears, so that a person can hear the alarm sound emitted during the acoustic alarm more easily and respond in time. For example, when the acoustic alarm is applied to an automatic fire alarm system, people can escape in time.
As shown in fig. 3 and 4, the first 10% -40% of the driving signal provided by this embodiment is the first driving signal segment; the last 60% -90% of the driving signal is the second driving signal segment. The duty ratio of the first driving signal section provided by the embodiment is 20% -70%; the duty ratio of the second driving signal section is 5% -20%. Therefore, the purpose of ensuring the sound intensity on the premise of ensuring the reduction of the power consumption can be further realized.
With continued reference to fig. 3 and 4, a preferred embodiment is that the first 30% of the driving signal is the first driving signal segment; the last 70% of the drive signal is the second drive signal segment. The duty ratio of the second driving signal section is 55%; the duty ratio of the second driving signal segment is 10%, but the invention is not limited thereto.
With continued reference to fig. 1 and fig. 2, the signal driving module includes a single chip microcomputer 101 and a driving circuit 102 connected to the single chip microcomputer 101; the single chip microcomputer 101 is used for outputting the driving signal, and the driving circuit 102 drives the buzzer 103 to sound according to the driving signal. In some other embodiments, the device further includes a rectifier circuit 100 for rectifying a signal output by the communication line, the two-wire system communication line is connected to the rectifier circuit 100, and the rectifier circuit 100 is further connected to the single chip 101 through the two-wire system positive communication line and the two-wire system negative communication line.
With continued reference to fig. 2, in some other embodiments, the driving circuit 102 includes: the energy storage capacitor C9 and the inductor L5 are connected with the two-wire system communication line and used for storing voltage from the two-wire system communication line, the inductor L5 is connected to two ends of an interface J1 of the buzzer in parallel and used for releasing stored energy in the form of induced electromotive voltage, and high voltage is generated at two ends of an interface J1 of the buzzer to drive the buzzer to sound.
In some other embodiments, the driving circuit 102 further includes: a first triode Q2 and a second triode Q3, wherein the emitter of the first triode Q2 is connected with the base of the second triode Q3, and the collector of the first triode Q2 and the collector of the second diode Q3 are respectively connected with the inductor L5; the first triode Q2 and the second triode Q3 are used for conducting and conducting; when the first transistor Q2 and the second transistor Q3 are turned on, the voltage on the energy storage capacitor C9 is stored in the inductor L5 in the form of current; when the first triode Q2 and the second triode Q3 are turned off, the energy stored in the inductor L5 is released in the form of induced electromotive voltage, and the buzzer is driven to sound.
Referring to fig. 2, in the present embodiment, the driving circuit 102 includes: the circuit comprises an energy storage capacitor C9, an inductor L5, a first diode D7, a second diode D8, a first triode Q2, a second triode Q3, a first resistor R7, a second resistor R9 and a third resistor R10. The anode of the second diode D8 is connected to the two-wire medium-positive communication line, and the cathode thereof is connected to the anode of the first diode D7 and the energy-storage capacitor C9 through the first resistor R7. The cathode of the first diode D7 is connected with the first end of the inductor L5; one end of the second resistor R9 is connected with the output end of the singlechip; the other end of the second resistor R9 is respectively connected with the base of the first triode Q2 and one end of the third resistor R10; the other end of the third resistor R10 is grounded. The emitter of the first triode Q2 is connected with the base of the second triode Q3, and the collector of the first triode Q2 and the collector of the second diode Q3 are respectively connected with the second end of the inductor L5; the emitter of the second diode Q3 is grounded.
The interface J1 of the buzzer is connected in parallel with two ends of the inductor L5; the energy storage capacitor C9 is used to store the voltage from the two-wire system positive communication line, i.e. the energy storage capacitor C9 is used to collect the energy of the bus (two-wire system positive communication line) and provide energy for the buzzer 103 to sound.
Because a momentarily large current is required for the buzzer 103 to sound and the buzzer 103 is not continuously operated. Therefore, the first resistor R7 is a current-limiting resistor, which is used for limiting the magnitude of the current obtained from the bus when the buzzer 103 is in operation, and is also used for providing energy for the operation of the buzzer 103 when the buzzer 103 is not in operation, and the energy-storing capacitor C9 can be fully charged through the first resistor R7 for the next sounding cycle.
The second diode D8 is configured to conduct in one direction to prevent the power on the storage capacitor C9 from losing the stored energy by discharging the bus when the bus voltage is not high (because the bus is a signal bus and has a high or low level).
The first diode D7 is used for unidirectional conduction, and prevents the current on the inductor L5 from reversely recharging the energy storage capacitor C9 to impact the energy storage capacitor C9.
The first triode Q2 and the second triode Q3 form a Darlington composite structure, so that the Darlington composite structure has high amplification factor, and can realize larger current control through extremely small base driving current. The inductor L5 is a boost inductor, and is matched with the first triode Q2 and the second triode Q3 to realize boost.
The base electrodes of the first triode Q2 and the second triode Q3 receive the driving signal, namely the BUZZER signal, from the singlechip through the second resistor R9; wherein the BUZZER signal is a PWM signal, i.e., a pulse width modulation signal.
According to the driving signal, the first transistor Q2 and the second transistor Q3 are turned on and off.
When the first transistor Q2 and the second transistor Q3 are turned on, the voltage on the energy storage capacitor C9 is stored in the inductor L5 as a current.
When the first transistor Q2 and the second transistor Q3 are turned off, the energy stored in the inductor L5 is discharged in the form of induced electromotive voltage, so as to generate high voltage across the interface J1 of the buzzer 103, thereby driving the buzzer 103 to sound.
It will be appreciated that the buzzer 103 is a piezoelectric ceramic, i.e. when a voltage is applied across the piezoelectric ceramic (a high voltage is generated across the interface J1 of the buzzer 103), it will deform, and when a voltage is applied at a certain frequency (e.g. in the sensitive frequency range of the human ear), the deformation will vibrate and make a sound. The buzzer 103 has a natural resonance frequency, and when the frequency of the voltage application is the same as the frequency, the buzzer will have the maximum sound emission efficiency because of resonance. Meanwhile, the higher the voltage, the larger the deformation amount and the larger the sound.
In this embodiment, when the bases of the first transistor Q2 and the second transistor Q3 receive the first driving signal segment of the driving signal, the total time that the first transistor Q2 and the second transistor Q3 are turned on is the first time period.
When the bases of the first transistor Q2 and the second transistor Q3 receive the second driving signal segment in the driving signal, the total time of the conduction of the first transistor Q2 and the second transistor Q3 is a second time period. The first time period is greater than the second time period. Therefore, the duty ratio of the first driving signal section is larger than that of the second driving signal section, then the first time section is larger than the second time section, so that the buzzer can emit sound for a longer time in the first driving signal section, the sound intensity can be guaranteed, the buzzer emits sound for a shorter time in the second driving signal section, and the power consumption can be reduced.
On the other hand, as shown in fig. 5, the present embodiment provides a method of driving a buzzer in an acoustic alarm, including:
and step S1, the resonance frequency of the buzzer is obtained.
Step S2, setting the frequency of the driving signal equal to the resonance frequency of the buzzer.
Step S3, in each frequency cycle of the driving signal, setting the driving signal as a first driving signal segment and a second driving signal segment, where a duty ratio of the first driving signal segment is greater than a duty ratio of the second driving signal segment.
And step S4, generating a periodic driving signal for driving the buzzer to sound.
Specifically, the duty ratio of the driving signal is adjusted by the single chip 101, for example, the single chip 101 is a Micro Control Unit (MCU), but the invention is not limited thereto.
The driving signal with the duty ratio meeting the requirement is output by configuring a timer of the singlechip 101. The operation of the timer is specifically to change the duty ratio of the output signal by configuring a register inside the MCU and outputting high/low levels at different times.
In this embodiment, the resonance frequency of the buzzer is 20Hz to 20 kHz. The duty ratio of the first driving signal section is 20% -70%; the duty ratio of the second driving signal section is 5% -20%. The first 10% -40% of the driving signal is the first driving signal segment; the last 60% -90% of the driving signal is the second driving signal segment.
For better understanding of the present embodiment, for example, the period of the driving signal of the present embodiment is 800ms, the time for outputting the PWM signal is 360ms, and the interval part time is 440 ms; the first 30% of the PWM signal of 360ms is the first drive signal segment, whose duty cycle is preferably 55%, to achieve that the sound intensity meets the standard requirements.
The last 70% of the 360ms PWM signal is the second drive signal segment with a duty cycle of preferably 10% to allow the sound duration to continue the human ear receiving stimulation with relatively little power consumption.
This embodiment has also carried out technical test to it and compared corresponding test result:
test scheme 1 (implementing the technical scheme of the present invention): the test conditions were as follows: in the case of a anechoic room environment, A is weighted, the test distance is 3 meters, the right front is provided, and power supply DC is 24V, the driving signal is configured to be 360 milliseconds ON and 440 milliseconds OFF; the frequency is 2.81K, (the duty ratio of the first 30% filling wave in the ON stage is 55%, and the duty ratio of the last 70% filling wave in the ON stage is 10%), and the test result obtained by the test is that the sound intensity generated by the acoustic alarm provided by the embodiment is 87.6dB, the maximum value of the alarm current used is 4.216mA, and the average value is 2.16 mA.
Test scheme 2 (a common protocol in the art without the implementation of the technical solution of the present invention): the test conditions were as follows: in the anechoic room environment, A is weighted, the driving signal is configured to be 360 milliseconds ON and 440 milliseconds OFF under the condition that the distance is 3 meters and the power supply is direct ahead and the power supply is DC 24V; the frequency is 2.81K, (duty ratio is 55%), and the test result obtained by the test is that the sound intensity generated by the acoustic alarm is 87.3dB, the maximum value of the used alarm current is 6.42mA, and the average value of the used alarm current is 3.78 mA.
Comparing the test results of the above tests, it can be seen that, in order to meet the sound intensity requirement, the test scheme 2 (general scheme) uses a larger alarm current, and the average value and the maximum value of the alarm current are higher than the corresponding value of the alarm current used in the test scheme 1 (this embodiment).
Therefore, the test scheme 1, namely the technical scheme of the embodiment is adopted to drive the buzzer, so that the buzzer can emit larger sound intensity (the sound intensity meets the requirement), smaller alarm current can be used, the power consumption is reduced, the application of a two-wire system in an acoustic alarm system is ensured, and the cost is saved.
To sum up, the audible alarm that this embodiment provided, it specifically is a two-wire system audible alarm, includes: the signal driving module periodically outputs a driving signal, and the buzzer sounds according to the received driving signal; the frequency of the driving signal is the same as the resonance frequency of the buzzer; it can be seen that since the buzzer resonant frequency is a self-contained property of its manufacture, the resonance can be generated and the sound is maximized as the frequency of the sound driving the driving signal is consistent with it.
Each drive signal divide into first drive signal section and second drive signal section, wherein the duty cycle of first drive signal section is greater than the duty cycle of second drive signal section, can know from this, the duty cycle of this first drive signal section is bigger, and its mainly used controls the sound intensity that bee calling organ produced accords with the preset standard, the duty cycle of second drive signal section is smaller, and its mainly used reduces the consumption under the prerequisite that bee calling organ lasts to produce sound.
In this embodiment, the duty ratio distribution of the driving signal is controlled to control the on/off time ratio of the first transistor Q2 and the second transistor Q3, that is, when the bases of the first transistor Q2 and the second transistor Q3 receive the second driving signal segment in the driving signal, the total off time of the first transistor Q2 and the second transistor Q3 is the second time period. Because the duty cycle of first drive signal section is greater than the duty cycle of second drive signal section, then first time quantum is greater than the second time quantum, and from this can know, bee calling organ sends sound time longer at first drive signal section, can guarantee the sound intensity, bee calling organ sends sound short at second drive signal section, can reduce the consumption.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It should be noted that the apparatuses and methods disclosed in the embodiments herein can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments herein. In this regard, each block in the flowchart or block diagrams may represent a module, a program, or a portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments herein may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (12)
1. An audible alarm, comprising:
a signal driving module for driving the signal to be transmitted,
a buzzer connected with the signal driving module,
the signal driving module periodically outputs a driving signal, and the buzzer sounds according to the received driving signal;
the frequency of the driving signal is the same as the resonance frequency of the buzzer;
each driving signal is divided into a first driving signal section and a second driving signal section, wherein the duty ratio of the first driving signal section is larger than that of the second driving signal section.
2. An acoustic alarm as claimed in claim 1 wherein the resonant frequency of the buzzer is in the range 20Hz to 20 kHz.
3. The acoustic alarm of claim 1, wherein the duty cycle of the first drive signal segment is between 20% and 70%; the duty ratio of the second driving signal section is 5% -20%.
4. An acoustic alarm according to claim 1 or 3 wherein the first 10% to 40% of the drive signal is the first drive signal segment; the last 60% -90% of the driving signal is the second driving signal segment.
5. The acoustic alarm of claim 1, wherein the signal driving module comprises a driving circuit connected with a single chip microcomputer; the singlechip is used for outputting the driving signal, and the driving circuit drives the buzzer to sound according to the driving signal.
6. The audible alarm of claim 5, wherein said drive circuit comprises: the energy storage capacitor C9 and the inductor L5 are connected with the two-wire system communication line and used for storing voltage from the two-wire system communication line, the inductor L5 is connected to two ends of an interface J1 of the buzzer in parallel and used for releasing stored energy in the form of induced electromotive voltage, and high voltage is generated at two ends of an interface J1 of the buzzer to drive the buzzer to sound.
7. The audible alarm of claim 6, wherein said drive circuit further comprises: a first triode Q2 and a second triode Q3, wherein the emitter of the first triode Q2 is connected with the base of the second triode Q3, and the collector of the first triode Q2 and the collector of the second diode Q3 are respectively connected with the inductor L5; the first triode Q2 and the second triode Q3 are used for conducting and conducting; when the first transistor Q2 and the second transistor Q3 are turned on, the voltage on the energy storage capacitor C9 is stored in the inductor L5 in the form of current; when the first triode Q2 and the second triode Q3 are turned off, the energy stored in the inductor L5 is released in the form of induced electromotive voltage, and the buzzer is driven to sound.
8. The audible alarm as claimed in claim 7, wherein when the bases of the first transistor Q2 and the second transistor Q3 receive the first driving signal segment of the driving signal, the first transistor Q2 and the second transistor Q3 are turned on for a first period of time;
when the bases of the first transistor Q2 and the second transistor Q3 receive the second driving signal segment in the driving signal, the total time of the conduction of the first transistor Q2 and the second transistor Q3 is a second time period;
the first time period is greater than the second time period.
9. A method of driving a buzzer in an audible alarm, comprising:
acquiring the resonance frequency of the buzzer;
setting the frequency of a driving signal to be equal to the resonance frequency of the buzzer;
setting the driving signals as a first driving signal segment and a second driving signal segment in each frequency period of the driving signals, wherein the duty ratio of the first driving signal segment is greater than that of the second driving signal segment; and
and generating a periodic driving signal for driving the buzzer to sound.
10. A method of actuating a buzzer in an acoustic alarm unit according to claim 9,
the resonance frequency of the buzzer is 20 Hz-20 kHz.
11. A method of driving a buzzer in an acoustic alarm unit according to claim 10,
the duty ratio of the first driving signal section is 20% -70%;
the duty ratio of the second driving signal section is 5% -20%.
12. A method of actuating a buzzer in an acoustic alarm unit according to claim 11,
the first 10% -40% of the driving signal is the first driving signal segment;
the last 60% -90% of the driving signal is the second driving signal segment.
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| CN2123844U (en) * | 1992-03-12 | 1992-12-02 | 中国民航华北管理局航务管理中心 | Extra long distance vhf controller |
| CN109003597A (en) * | 2018-09-25 | 2018-12-14 | 无锡华润矽科微电子有限公司 | Buzzer drive circuit and corresponding buzzer driving method |
| CN111583607A (en) * | 2020-05-09 | 2020-08-25 | 山东众海智能科技有限公司 | Two-wire system automatic fire alarm system |
| CN112735366A (en) * | 2020-12-24 | 2021-04-30 | 青岛鼎信通讯消防安全有限公司 | PWM (pulse-width modulation) variable-frequency sound driving device for automatic fire alarm system and design method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2123844U (en) * | 1992-03-12 | 1992-12-02 | 中国民航华北管理局航务管理中心 | Extra long distance vhf controller |
| CN109003597A (en) * | 2018-09-25 | 2018-12-14 | 无锡华润矽科微电子有限公司 | Buzzer drive circuit and corresponding buzzer driving method |
| CN111583607A (en) * | 2020-05-09 | 2020-08-25 | 山东众海智能科技有限公司 | Two-wire system automatic fire alarm system |
| CN112735366A (en) * | 2020-12-24 | 2021-04-30 | 青岛鼎信通讯消防安全有限公司 | PWM (pulse-width modulation) variable-frequency sound driving device for automatic fire alarm system and design method |
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