Self-eliminating abnormal sound buzzer tail circuit and electrical equipment applying the same

Abstract

The present invention discloses a buzzer tail circuit capable of self-eliminating abnormal sounds and an electrical device applying the same. Among them, the buzzer tail circuit capable of self-eliminating abnormal sounds includes: an input-output splitting module for realizing dual-input and dual-output of signals, a dual-reverse module for in-phase outputting high and low levels according to the dual-output states, and a tail voltage output module for realizing buzzer tail output and self-eliminating abnormal sounds according to the dual-output states and high and low levels. The buzzer tail circuit capable of self-eliminating abnormal sounds of the present invention abandons dual-IO control, reduces the resource cost of the single-chip microcomputer IO port, realizes the resonant sound generation of the passive piezoelectric buzzer through a single-IO control method, realizes the open circuit of the buzzer through the dual-reverse module to self-eliminate abnormal sounds, and realizes the tail sound output through the single-IO splitting circuit to output a dual-level state, avoiding interference, improving the development efficiency of developers, shortening the development cycle, and improving the product reliability.

Description

Technical Field

[0001] The present invention belongs to the technical field of buzzers, and particularly relates to a buzzer tail circuit for self-eliminating abnormal sounds and an electrical device applying the same. Background Art

[0002] Generally, the buzzer circuits of home appliances such as range hoods and steam ovens on the market adopt a piezoelectric buzzer circuit controlled by "dual IO + triode".

[0003] However, this piezoelectric buzzer circuit has disadvantages such as high hardware cost, abnormal sound when powered on, and waste of single-chip microcomputer IO resources. In the past, R & D personnel or enterprises ignored the innovation and improvement of this part of the application due to following conventions and limitations in technology improvement, directly leading to objective phenomena such as low product reliability, high cost in the development process, and decline in brand quality. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a buzzer tail circuit for self-eliminating abnormal sounds, which reduces the resource cost of the single-chip microcomputer IO port and realizes self-elimination of abnormal sounds of the buzzer.

[0005] Another object of the present invention is to provide an electrical device.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A buzzer tail circuit for self-eliminating abnormal sounds includes an input-output splitting module for realizing dual-input and dual-output of signals, a dual-reverse module for in-phase output of high and low levels according to the dual-output state, and a tail voltage output module for realizing buzzer tail output and self-eliminating abnormal sounds according to the dual-output state and high and low levels. The input-output splitting module is electrically connected to the dual-reverse module and the tail voltage output module, and the dual-reverse module is electrically connected to the tail voltage output module.

[0008] Preferably, it further includes a buzzer module, and the buzzer module is electrically connected to the dual-reverse module and the tail voltage output module.

[0009] Preferably, the input-output splitting module includes a first triode Q1, a first capacitor C1, a first diode D1, and a first resistor R1. The base of the first triode Q1 is connected in parallel with one end of the first capacitor C1, the positive electrode of the first diode D1, and one end of the first resistor R1. The other end of the first capacitor C1 is grounded, and the negative electrode of the first diode D1 and one end of the first resistor R1 are both electrically connected to the IO port B0 and the dual-reverse module.

[0010] Preferably, the double reverse module includes a second triode Q2, a second resistor R2, a third resistor R3, a fourth resistor R4, and a field effect transistor Q4. The base of the second triode Q2 is electrically connected to the input-output splitting module. The collector of the second triode Q2 is connected in parallel with one end of the second resistor R2, one end of the third resistor R3, and the gate of the field effect transistor Q4. The other end of the second resistor R2 is connected to the first power supply. The emitter of the second triode Q2, the other end of the third resistor R3, and the source of the field effect transistor Q4 are all grounded. The drain of the field effect transistor Q4 is connected in parallel with one end of the fourth resistor R4 and the buzzer module. The other end of the fourth resistor R4 is connected to the end voltage output module.

[0011] Preferably, the end voltage output module includes a third triode Q3, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an electrolytic capacitor EC1. The base of the third triode Q3 is connected in parallel with one end of the sixth resistor R6 and one end of the seventh resistor R7. The other end of the seventh resistor R7 and the emitter of the third triode Q3 are both connected to the first power supply. The other end of the sixth resistor R6 is electrically connected to the collector of the first triode Q1. The collector of the third triode Q3 is connected in series with the fifth resistor R5 and then connected in parallel with one end of the electrolytic capacitor EC1 and the double reverse module. The other end of the electrolytic capacitor EC1 is grounded.

[0012] Preferably, the buzzer module includes a buzzer BUZ and an eighth resistor R8. Both ends of the buzzer BUZ are electrically connected to both ends of the eighth resistor R8. One end of the eighth resistor R8 is electrically connected to the common connection end of the fourth resistor R4 and the fifth resistor R5. The other end of the eighth resistor R8 is electrically connected to the common connection end of the fourth resistor R4 and the field effect transistor Q4.

[0013] Preferably, the voltage of the first power supply is 5V.

[0014] Preferably, the frequency of the buzzer BUZ is 2 ± 0.5 KHZ, and the decibel of the buzzer BUZ is 75 dB.

[0015] Preferably, the fourth resistor R4 is a clamping resistor.

[0016] Another technical solution of the present invention is implemented as follows:

[0017] An electrical device includes the buzzer end circuit for self-eliminating abnormal sounds described above.

[0018] Compared with the prior art, the buzzer tail circuit for self-eliminating abnormal sounds in the present invention realizes dual input and dual output of signals through an input-output splitting module, outputs high and low levels in phase according to the dual output states through a dual-reverse module, and realizes the buzzer tail output and self-eliminates abnormal sounds according to the dual output states and high and low levels through a tail voltage output module. Thus, the dual-IO control is abandoned, the resource cost of the single-chip microcomputer IO port is reduced, the resonant sound of the passive piezoelectric buzzer is realized through a single-IO control method, the buzzer is opened through the dual-reverse module to self-eliminate abnormal sounds, and the tail sound output is realized by the single-IO splitting circuit to output a dual-level state, avoiding interference, improving the development efficiency of developers, shortening the development cycle, and improving the product reliability. Description of the Drawings

[0019] Figure 1 It is a circuit diagram of a buzzer tail circuit for self-eliminating abnormal sounds provided in Embodiment 1 of the present invention.

[0020] Description of the Reference Numerals

[0021] 1 - Input-output splitting module, 2 - Dual-reverse module, 3 - Tail voltage output module. Detailed Embodiments

[0022] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] Embodiment 1

[0024] The embodiment of the present invention provides a buzzer tail circuit for self-eliminating abnormal sounds, as Figure 1 shown, including an input-output splitting module 1 for realizing dual input and dual output of signals, a dual-reverse module 2 for outputting high and low levels in phase according to the dual output states, and a tail voltage output module 3 for realizing the buzzer tail output and self-eliminating abnormal sounds according to the dual output states and high and low levels. The input-output splitting module 1 is electrically connected to the dual-reverse module 2 and the tail voltage output module 3, and the dual-reverse module 2 is electrically connected to the tail voltage output module 3.

[0025] In this way, dual input and dual output of signals are realized through the input-output splitting module 1, high and low levels are output in phase according to the dual output states through the dual reverse module 2, and buzzer tail sound output and self-elimination of abnormal sound are realized through the tail sound voltage output module 3 according to the dual output states and high and low levels, thereby abandoning dual IO control and reducing the resource cost of the IO port of the single-chip microcomputer. The resonant sound of the passive piezoelectric buzzer is realized through the single IO control method, the buzzer is disconnected and the abnormal sound is self-eliminated through the dual reverse module, and the tail sound output is realized for the output dual level state through the single IO splitting module, thereby avoiding interference, improving the development efficiency of developers, shortening the development cycle, and improving product reliability.

[0026] It also includes a buzzer module 4 , which is electrically connected to the dual inversion module 2 and the tail sound voltage output module 3 .

[0027] In this way, the buzzer module 4 receives high and low level sounds.

[0028] The input-output splitting module 1 includes a first transistor Q1, a first capacitor C1, a first diode D1 and a first resistor R1. The base of the first transistor Q1 is connected in parallel to one end of the first capacitor C1, the positive electrode of the first diode D1 and one end of the first resistor R1. The other end of the first capacitor C1 is grounded. The negative electrode of the first diode D1 and one end of the first resistor R1 are both electrically connected to the IO port B0 and the dual reverse module 2.

[0029] In this way, the IO split state output is realized through the input-output split module 1, which specifically includes the following steps:

[0030] 1.1: When the IO port "B0" is at a high level, due to the saturation conduction of the first transistor Q1, the output of B1 is low level and the output of B2 is high level;

[0031] 1.2: When the IO port "B0" is at a low level, due to the cutoff of the first transistor Q1, the output of B1 is high level and the output of B2 is low level;

[0032] 1.3: When the IO port "B0" is PWM, due to the low-pass filter composed of the first resistor R1, the first capacitor C1 and the first diode D1, the first transistor Q1 is cut off, so that B1 outputs a high level and B2 outputs a PWM level. From then on, the split state output of IO is realized.

[0033] The double reverse module 2 includes a second triode Q2, a second resistor R2, a third resistor R3, a fourth resistor R4, and a field effect transistor Q4. The base of the second triode Q2 is electrically connected to the input-output splitting module 1. The collector of the second triode Q2 is connected in parallel with one end of the second resistor R2, one end of the third resistor R3, and the gate of the field effect transistor Q4. The other end of the second resistor R2 is connected to the first power supply. The emitter of the second triode Q2, the other end of the third resistor R3, and the source of the field effect transistor Q4 are all grounded. The drain of the field effect transistor Q4 is connected in parallel with one end of the fourth resistor R4 and the buzzer module 4. The other end of the fourth resistor R4 is connected to the end voltage output module 3. Among them, the voltage of the first power supply is 5V.

[0034] In this way, the in-phase output of the B2 state is realized through the double reverse module 2, which specifically includes the following steps:

[0035] 2.1: When B2 is at a high level, due to the saturation conduction of the second triode Q2, VCE_Q2 = 0, and the field effect transistor Q4 is cut off, resulting in the E2 output being at a high level;

[0036] 2.2: When B2 is at a low level, since the second triode Q2 is cut off, the field effect transistor Q4 is forward-biased and conducted through the second resistor R2 and the third resistor R3, and the E2 output is at a low level;

[0037] 2.3: When B2 is at a PWM level, due to the second triode Q2 and the field effect transistor Q4 alternately repeating steps 2.2 to 2.3, the E2 output is at a PWM level.

[0038] The end voltage output module 3 includes a third triode Q3, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an electrolytic capacitor EC1. The base of the third triode Q3 is connected in parallel with one end of the sixth resistor R6 and one end of the seventh resistor R7. The other end of the seventh resistor R7 and the emitter of the third triode Q3 are both connected to the first power supply. The other end of the sixth resistor R6 is electrically connected to the collector of the first triode Q1. The collector of the third triode Q3 is connected in series with the fifth resistor R5 and then connected in parallel with one end of the electrolytic capacitor EC1 and the double reverse module 2. The other end of the electrolytic capacitor EC1 is grounded. Among them, the fourth resistor R4 is a clamping resistor, and its resistance value is 200KΩ. Among them, the capacitance of the electrolytic capacitor EC1 is 100μF, and the voltage is 16V.

[0039] In this way, the buzzer end voltage pre-charging is realized through the end voltage output module 3, and the abnormal sound of the buzzer is self-eliminated by the clamping resistor R30, which specifically includes the following steps:

[0040] 3: When B0 is at a high level, the circuit enters the 1.1 and 2.1 stages. The third triode Q3 conducts and is connected to the first power supply +5V. The electrolytic capacitor EC1 is charged through the fifth resistor R5. Since one end of the buzzer BUZ is connected to the electrolytic capacitor EC1 at point E1, the voltage of the buzzer BUZ is equal to the voltage of the electrolytic capacitor EC1 at this time.

[0041] According to 2.1, when B0 high level → B2 high level → E2 low level → Q4 cutoff, the other end of the buzzer is connected to point E1 through the clamping resistor, the fourth resistor R4. At this time, the voltages on both sides of the buzzer are equal, and no current flows through, so the inherent conduction abnormal sound caused by the rising voltage of the electrolytic capacitor EC1 is automatically eliminated.

[0042] The buzzer module 4 includes a buzzer BUZ and an eighth resistor R8. Both ends of the buzzer BUZ are electrically connected to both ends of the eighth resistor R8. One end of the eighth resistor R8 is electrically connected to the common connection end of the fourth resistor R4 and the fifth resistor R5, and the other end of the eighth resistor R8 is electrically connected to the common connection end of the fourth resistor R4 and the field effect transistor Q4. Among them, the frequency of the buzzer BUZ is 2 ± 0.5KHZ, and the decibel of the buzzer BUZ is 75dB.

[0043] In this way, the end output of the piezoelectric buzzer is realized by setting the B0 port to continuously output a PWM signal, which specifically includes the following steps:

[0044] 4.1: When the IO port B0 is a PWM signal, it enters the 1.3 and 2.3 stages, and the first power supply +5V stops charging the electrolytic capacitor EC1.

[0045] 4.2: When the PWM signal is at a high level, according to 3, it can be known that the buzzer outputs without abnormal sound.

[0046] 4.3: When the PWM signal is at a low level, according to 2.2, the field effect transistor Q4 conducts, and the electrolytic capacitor EC1 outputs current to the buzzer through point E1, and the buzzer sounds.

[0047] 4.4: Repeat steps 4.2 to 4.3, and the buzzer sound continues. However, since the voltage of the electrolytic capacitor EC1 gradually decreases as the buzzer sound is consumed, a trailing effect of the buzzer sound is generated.

[0048] 5: Set the B0 port to continuously output a high level to turn off the piezoelectric buzzer.

[0049] When a buzzer cycle is completed, set B0 to continuously output a high level and enter the 1.1, 2.1, and 3 stages; the electrolytic capacitor EC1 is pre-charged to +5V for the next cycle, the field effect transistor Q4 is turned off, and the buzzer eliminates abnormal sound by itself due to the clamping effect of the fourth resistor R4, making the potentials at both ends of the buzzer equal.

[0050] The buzzer tail circuit for self-eliminating abnormal sounds of the present invention realizes dual input and dual output of signals through an input-output splitting module, outputs high and low levels in phase according to the dual output states through a dual reverse module, and realizes buzzer tail output and self-elimination of abnormal sounds according to the dual output states and high and low levels through a tail voltage output module. Thus, dual IO control is abandoned, the resource cost of the single-chip microcomputer IO port is reduced, the resonant sound of the passive piezoelectric buzzer is realized through a single IO control method, the buzzer is opened through the dual reverse module to avoid abnormal sounds during power-on, the tail sound output is realized by the single IO splitting circuit for outputting a dual-level state, a clamping resistor is set to realize self-elimination of abnormal sounds of the buzzer, interference is avoided, the development efficiency of developers is improved, the development cycle is shortened, and the product reliability is improved.

[0051] Embodiment 2

[0052] Embodiment 2 of the present invention provides an electrical device, which includes the buzzer tail circuit for self-eliminating abnormal sounds described above.

[0053] Among them, the electrical device is a high-power electrical device such as a range hood or a steam oven.

[0054] For the electrical device of the present invention, dual input and dual output of signals are realized through an input-output splitting module, high and low levels are output in phase according to the dual output states through a dual reverse module, and buzzer tail output and self-elimination of abnormal sounds are realized according to the dual output states and high and low levels through a tail voltage output module. Thus, dual IO control is abandoned, the resource cost of the single-chip microcomputer IO port is reduced, the resonant sound of the passive piezoelectric buzzer is realized through a single IO control method, the buzzer is opened through the dual reverse module to avoid abnormal sounds during power-on, the tail sound output is realized by the single IO splitting circuit for outputting a dual-level state, a clamping resistor is set to realize self-elimination of abnormal sounds of the buzzer, interference is avoided, the development efficiency of developers is improved, the development cycle is shortened, and the product reliability is improved.

[0055] As described above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A buzzer tail circuit for self-eliminating abnormal sounds, characterized in that, it includes an input-output splitting module (1) for realizing dual-input and dual-output of signals, a dual-inverting module (2) for in-phase outputting high and low levels according to the dual-output states, a tail voltage output module (3) for realizing buzzer tail output and self-eliminating abnormal sounds according to the dual-output states and high and low levels, and a buzzer module (4). The input-output splitting module (1) is electrically connected to the dual-inverting module (2) and the tail voltage output module (3), and the dual-inverting module (2) is electrically connected to the tail voltage output module (3); the buzzer module (4) is electrically connected to the dual-inverting module (2) and the tail voltage output module (3); The input-output splitting module (1) includes a first triode Q1, a first capacitor C1, a first diode D1, and a first resistor R1. The base of the first triode Q1 is connected in parallel with one end of the first capacitor C1, the positive electrode of the first diode D1, and one end of the first resistor R1. The other end of the first capacitor C1 is grounded, and the negative electrode of the first diode D1 and one end of the first resistor R1 are both electrically connected to the IO port B0 and the dual-inverting module (2); The dual-inverting module (2) includes a second triode Q2, a second resistor R2, a third resistor R3, a fourth resistor R4, and a field-effect transistor Q4. The base of the second triode Q2 is electrically connected to the input-output splitting module (1). The collector of the second triode Q2 is connected in parallel with one end of the second resistor R2, one end of the third resistor R3, and the gate of the field-effect transistor Q4. The other end of the second resistor R2 is connected to the first power supply. The emitter of the second triode Q2, the other end of the third resistor R3, and the source of the field-effect transistor Q4 are all grounded. The drain of the field-effect transistor Q4 is connected in parallel with one end of the fourth resistor R4 and one end of the buzzer module (4), and the other end of the fourth resistor R4 is connected to the tail voltage output module (3); The tail voltage output module (3) includes a third triode Q3, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an electrolytic capacitor EC1. The base of the third triode Q3 is connected in parallel with one end of the sixth resistor R6 and one end of the seventh resistor R7. The other end of the seventh resistor R7 and the emitter of the third triode Q3 are both connected to the first power supply. The other end of the sixth resistor R6 is electrically connected to the collector of the first triode Q1. The collector of the third triode Q3 is connected in series with the fifth resistor R5 and then in parallel with one end of the electrolytic capacitor EC1, the other end of the fourth resistor R4, and the other end of the buzzer module (4). The other end of the electrolytic capacitor EC1 is grounded; the capacitance of the electrolytic capacitor EC1 is 100 μF and the voltage is 16V.

2. The buzzer tail circuit for self-eliminating abnormal sounds according to claim 1, characterized in that, The buzzer module (4) includes a buzzer BUZ and an eighth resistor R8. Both ends of the buzzer BUZ are electrically connected to both ends of the eighth resistor R8. One end of the eighth resistor R8 is electrically connected to the common connection end of the fourth resistor R4 and the fifth resistor R5. The other end of the eighth resistor R8 is electrically connected to the common connection end of the fourth resistor R4 and the field effect transistor Q4.

3. The buzzer tail sound circuit for self-eliminating abnormal sound according to claim 1 or 2, characterized in that, the voltage of the first power supply is 5V.

4. The buzzer tail sound circuit for self-eliminating abnormal sound according to claim 2, characterized in that, the frequency of the buzzer BUZ is 2 ± 0.5 KHZ, and the decibel of the buzzer BUZ is 75 dB.

5. The buzzer tail sound circuit for self-eliminating abnormal sound according to claim 4, characterized in that, the fourth resistor R4 is a clamping resistor.

6. An electrical equipment, characterized in that, it includes the buzzer tail sound circuit for self-eliminating abnormal sound according to any one of claims 1-5.

Images