CN106531140B - Piezoelectric buzzer driving circuit - Google Patents
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- CN106531140B CN106531140B CN201611102144.3A CN201611102144A CN106531140B CN 106531140 B CN106531140 B CN 106531140B CN 201611102144 A CN201611102144 A CN 201611102144A CN 106531140 B CN106531140 B CN 106531140B
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 28
- 230000000694 effects Effects 0.000 claims description 6
- 230000009466 transformation Effects 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
- G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The application discloses a piezoelectric buzzer driving circuit, which comprises an enabling control module, a stabilizing module, an oscillation control module and a boosting driving module which are sequentially connected; the enabling control module comprises a transistor Q1 and a transistor Q2, the stabilizing module comprises a transistor Q3, the oscillation control module comprises a transistor Q4, and the boosting driving module comprises a transformer L1 and a piezoelectric buzzer B1; when the transistor Q1 is turned on, the transistor Q2 is controlled to be turned on and the transistor Q3 is controlled to be turned off, the transistor Q2 is turned on, the transistor Q4 is controlled to be turned on, and the oscillation control module works; after the oscillation control module works, when the capacitor C1 is charged and discharged, the transistor Q4 is in a switching state of on or off, so that the primary coil of the transformer L1 continuously oscillates, and the piezoelectric buzzer B1 emits continuous high-decibel beeping; when the piezoelectric buzzer B1 does not work, the current consumption of the transistor Q1, the transistor Q2, the transistor Q3 and the transistor Q4 is extremely low, so that the standby power consumption of the whole driving circuit is extremely low and the driving circuit is more energy-saving.
Description
Technical Field
The application relates to the field of buzzers, in particular to a piezoelectric buzzer driving circuit.
Background
The piezoelectric buzzer is characterized in that a metal sheet vibrates through a ceramic sheet with a piezoelectric effect to generate sound, the piezoelectric ceramic sheet subjected to high-voltage extreme pressure is generally adhered to the vibrating metal sheet, and after alternating voltage is applied, the piezoelectric ceramic sheet mechanically deforms due to the piezoelectric effect to generate stretching or shrinking phenomena, and the metal sheet vibrates to generate sound by utilizing the characteristic. The piezoelectric buzzer belongs to capacitive load devices, has infinite direct current impedance and larger alternating current impedance, and needs higher driving voltage during driving, but has smaller driving current, and is generally about 10 mA.
The prior piezoelectric buzzer driving circuit needs higher voltage, and a special boosting power supply chip and a special driving integrated chip are often needed in a low-voltage power supply system. The piezoelectric buzzer driving circuit is limited by the integrated chip, and the output sound decibel is low; the input-output voltage difference is large, the loss power consumption is large, the static power consumption is high, and the energy is not saved. The piezoelectric buzzer driving circuit has higher cost and overhigh cost, and in a battery power supply system, the service life of a battery is seriously influenced, the life cycle of a product is shortened, the piezoelectric buzzer driving circuit cannot be widely used in alarms which are sensitive in cost, low in power consumption and have longer service life when the battery is needed (such as independent smoke alarms),
disclosure of Invention
The piezoelectric buzzer driving circuit is low in static power consumption and low in cost, and can be widely used in an alarm with a battery needing a longer service life.
The application provides a piezoelectric buzzer driving circuit, include: the system comprises an enabling control module, a stabilizing module, an oscillation control module and a boost driving module which are sequentially connected;
the enabling control module comprises a transistor Q1 and a transistor Q2, wherein a first electrode of the transistor Q1 is connected with a control electrode of the transistor Q2, and the control electrode is connected with an input end of the piezoelectric buzzer driving circuit and used for receiving an external enabling control signal; according to the external enabling control signal, the transistor Q1 controls the transistor Q2 to be turned off or turned on, when the transistor Q1 is turned off, the transistor Q2 is turned off, and when the transistor Q1 is turned on, the transistor Q2 is turned on;
the stabilizing module provides a stabilizing control signal for the oscillation control module and comprises a transistor Q3, wherein the control electrode of the transistor Q3 is connected with the first electrode of the transistor Q1; the transistor Q1 controls the transistor Q3 to be turned off or on according to the external enabling control signal, when the transistor Q1 is turned off, the transistor Q3 is turned on, and when the transistor Q1 is turned on, the transistor Q3 is turned off;
the oscillation control module comprises a transistor Q4 and a capacitor C1, wherein the control electrode of the transistor Q4 is connected with the first electrode of the transistor Q2 and the first electrode of the transistor Q3; when the transistor Q2 is turned on, the transistor Q2 controls the transistor Q4 to be turned on, the oscillation control module works, when the transistor Q3 is turned on, the transistor Q3 controls the transistor Q4 to be turned off, and the oscillation control module does not work; one end of the capacitor C1 is connected with the stabilizing module and the control electrode of the transistor Q4, and the other end of the capacitor C is connected with the boost driving module;
the boosting driving module comprises a transformer L1 and a piezoelectric buzzer B1, wherein a primary coil of the transformer L1 is connected with a first electrode of the transistor Q4, and a secondary coil of the transformer L1 is connected with a first pin and a second pin of the piezoelectric buzzer B1 in parallel; when the capacitor C1 is charged or discharged, the transistor Q4 is in a switching state of on or off, so that the oscillation control module controls the boost driving module to work, the primary coil of the transformer L1 continuously oscillates, and the piezoelectric buzzer B1 sounds due to piezoelectric effect.
In some embodiments, the third pin of the piezoelectric buzzer B1 is further connected to the capacitor C1, and outputs an oscillation feedback signal of the piezoelectric buzzer B1 to the capacitor C1, the capacitor C1 discharges to turn off the transistor Q4, the oscillation feedback signal beep_f is at a high level, and when the transistor Q4 is turned on, the oscillation feedback signal beep_f is at a low level, and the capacitor C1 charges.
In some embodiments, when the oscillation control module is started, the transistor Q4 is turned on for the first time, so that the boost driving module is started, at this time, the oscillation feedback signal beep_f is first at a low level, the capacitor C1 is instantaneously discharged to turn off the transistor Q4, the oscillation feedback signal beep_f is turned to a high level, after the capacitor C1 is discharged, the transistor Q4 is controlled by the transistor Q2 to be turned on, and the oscillation feedback signal beep_f is turned to a low level again.
In some embodiments, the stabilizing module further includes a diode D1, where the diode D1 is connected in parallel with the transistor Q3 and is a voltage stabilizing diode, and is used to stabilize the oscillation feedback signal beep_f and protect the transistor Q3.
In some embodiments, the oscillation control module further includes a diode D2, where the diode D2 is connected in parallel with the transistor Q4 and is a zener diode, and the transistor Q4 is protected when the oscillation control module operates.
In some embodiments, the first electrode of the transistor Q3 is further connected to the first electrode of the transistor Q2, and when the transistor Q2 is turned on, the power supply is provided to the stabilizing module.
In some embodiments, the transformer L1 is an autotransformer.
In some embodiments, changing the transformation ratio of the transformer L1 can make the secondary coil obtain higher electromotive force, and the piezoelectric buzzer B1 sounds in a high decibel.
In some embodiments, the transistor Q3 operates on a voltage control principle.
In some embodiments, the transistors Q1, Q2, Q3, and Q4 comprise bipolar transistors or MOS transistors.
The beneficial effects of this application are: according to the piezoelectric buzzer driving circuit, the piezoelectric buzzer B1 is controlled to emit or stop emitting beeps through ingenious circuit connection among the transistors Q1, Q2, Q3 and Q4, and when the piezoelectric buzzer B1 does not work, the current consumption of the transistors Q1, Q2, Q3 and Q4 is extremely low, so that the standby power consumption of the piezoelectric buzzer driving circuit is extremely low, and the piezoelectric buzzer driving circuit is more energy-saving; in addition, as the autotransformer is adopted, the secondary coil can obtain higher electromotive force through changing the transformation ratio design of the transformer L1, and the piezoelectric buzzer B1 sounds in a high decibel, so that the high decibel piezoelectric buzzer driving circuit is realized in a low-voltage power supply system, and the piezoelectric buzzer driving circuit can be widely used in an alarm with a longer service life of a battery.
Drawings
Fig. 1 is a block diagram of a piezoelectric buzzer driving circuit provided in the present application;
fig. 2 is a schematic diagram of a driving circuit of a piezoelectric buzzer according to an embodiment of the present application.
Detailed Description
Embodiment one:
referring to fig. 1 and 2, the present application provides a piezoelectric buzzer driving circuit, which includes an enable control module 1, a stabilizing module 2, an oscillation control module 3 and a boost driving module 4 connected in sequence.
The enabling control module 1 comprises a transistor Q1, a transistor Q2, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5 which play a role in current limiting, wherein the transistor Q1 and the transistor Q2 are bipolar transistors. The resistor R1 is connected between the input end EN of the piezoelectric buzzer driving circuit and the base B of the transistor Q1, and the transistor Q1 receives an external enabling control signal through the resistor R1. The resistor R2 is connected between the emitter E of the transistor Q1 and the base B of the transistor Q1, wherein the emitter E of the transistor Q1 is grounded. Resistor R3 is connected to collector C of transistor Q1, and transistor Q1 is connected to stabilization module 2 via resistor R3. The resistor R4 is connected between the collector C of the transistor Q1 and the base B of the transistor Q2, the transistor Q1 controls the transistor Q2 to be turned off or on through the resistor R2 according to an external enabling control signal, and when the transistor Q1 is turned off, the transistor Q2 is turned off; when the transistor Q1 is turned on, the transistor Q2 is turned on. The resistor R5 is connected between the emitter E of the transistor Q2 and the collector C of the transistor Q2, the emitter E of the transistor Q2 is connected to the power source VCC, the collector C of the transistor Q2 is also connected to the stabilizing module 2, and when the transistor Q2 is turned on and in a saturated state, the power source is provided to the stabilizing module 2.
The stabilizing module 2 comprises a transistor Q3, a resistor R6 which plays a role in current limiting and a zener diode D1. The transistor Q3 is an NMOS transistor, the gate G of the transistor Q3 is connected with the collector C of the transistor Q1 through a resistor R3, the transistor Q1 controls the transistor Q3 to be cut off or to be switched on according to an external enabling control signal, when the transistor Q1 is cut off, the transistor Q3 is switched on, and when the transistor Q1 is switched on, the transistor Q3 is cut off; the drain electrode D of the transistor Q3 is connected with a resistor R6; the source S of transistor Q3 is grounded. One end of the resistor R6 is connected to the transistor Q2, and the other end is connected to the transistor Q3 and the oscillation control module 3, so that the drain D of the transistor Q3 is connected to the oscillation control module 3. Therefore, the transistor Q2 controls the drain D of the transistor Q3 through the resistor R6, and when the transistor Q2 is turned on, the drain D of the transistor Q3 is at a high level; the stabilizing module 2 provides a stabilizing control signal to the oscillation control module 3 via the drain D of the transistor Q3. The zener diode D1 is connected in parallel with the drain D and the source S of the transistor Q3, and is used for stabilizing the oscillation feedback signal beep_f and protecting the transistor Q3.
The oscillation control module 3 includes a transistor Q4, a capacitor C1, a resistor R7 for current limiting, and a zener diode D2. The transistor Q4 is an NMOS transistor, the gate G of the transistor Q4 is connected to the drain D of the transistor Q3, the other end of the resistor R6, and the capacitor C1, when the transistor Q2 is turned on, the transistor Q2 controls the transistor Q4 to be turned on through the resistor R6, the oscillation control module 3 works, and when the transistor Q3 is turned on, that is, the drain D of the transistor Q3 outputs a stable low level, so that the transistor Q4 is turned off, and the oscillation control module 3 does not work; the source S of the transistor Q4 is grounded; the drain D of the transistor Q4 is connected to the boost driving module 4, and controls the boost driving module 4 to operate. The capacitor C1 and the power supply VCC are respectively connected to two ends of the resistor R7. The zener diode D2 is connected in parallel with the drain D and the source S of the transistor Q4, and protects the transistor Q4 when the oscillation control module 3 is operated. One end of the capacitor C1 is connected to the stabilizing module 2 and the transistor Q4, and the other end is connected to the resistor R7 and the boost driving module 4, and receives the oscillation feedback signal beep_f from the boost driving module 4.
The step-up driving module 4 is controlled by the oscillation control module 3, and includes a transformer L1 and a piezoelectric buzzer B1. The primary coil of the transformer L1 is connected with the transistor Q4 and the power supply VCC, the secondary coil of the transformer L1 is connected with the first pin M and the second pin S of the piezoelectric buzzer B1 in parallel, and when the transistor Q4 is conducted, the boost driving module 4 is controlled to start working, so that the primary coil of the transformer L1 oscillates, and the piezoelectric buzzer B1 sounds due to the piezoelectric effect. The third pin F of the piezoelectric buzzer B1 is further connected to the capacitor C1, and outputs an oscillation feedback signal of the piezoelectric buzzer B1 to the capacitor C1. The transformer L1 is an autotransformer (three-terminal inductance), and the transformation ratio design of the transformer L1 is changed to enable the secondary coil to obtain higher electromotive force, so that the piezoelectric buzzer B1 emits high-decibel beeping.
Discharging the capacitor C1 to turn off the transistor Q4, and setting the oscillation feedback signal BEEP_F to be high level; when the transistor Q4 is turned on, the oscillation feedback signal beep_f is low, and the capacitor C1 is charged. The capacitor C1 is charged or discharged, the oscillation control module 3 controls the boost driving module 4 to work, so that the primary coil of the transformer L1 continuously oscillates, and the piezoelectric buzzer B1 emits high-decibel beeps due to the piezoelectric effect.
According to the piezoelectric buzzer driving circuit, when the piezoelectric buzzer B1 is required to generate a buzzing sound, the control process is as follows:
(1) The base B of the transistor Q1 receives an external enable control signal from the input terminal EN, and becomes a high level, the transistor Q1 is turned on, the collector C of the transistor Q1 is a low level, the base B of the transistor Q2 is a low level, so that the transistor Q2 is turned on, and the collector C of the transistor Q2 is a high level;
(2) The collector C of the transistor Q1 is low level, the grid G of the NMOS transistor Q3 is low level, and the NMOS transistor Q3 is cut off;
(3) The collector C of the transistor Q2 is high level, the drain D of the NMOS transistor Q3 is high level, the grid G of the NMOS transistor Q4 is high level, the NMOS transistor Q4 is conducted, and the oscillation control module 3 is started;
(4) The NMOS transistor Q4 is turned on for the first time, so that the boost driving module 4 is started, and the piezoelectric buzzer B1 emits a high db beep.
It should be noted that, when the transistor Q4 is turned on for the first time to start the boost driving module 4, the oscillation feedback signal beep_f is first at a low level, the capacitor C1 is instantaneously discharged to turn the transistor Q4 off, the oscillation feedback signal beep_f is turned to a high level, and after the capacitor C1 is discharged, the transistor Q4 is controlled by the transistor Q2 to be turned on again, and the oscillation feedback signal beep_f is turned to a low level again.
After the oscillation control module 3 is started, when the capacitor C1 is charged and discharged, the NMOS tube Q4 is in a switching state of on or off, so that the primary coil of the transformer L1 continuously oscillates, and the piezoelectric buzzer B1 emits continuous high-decibel beeps.
According to the piezoelectric buzzer driving circuit, when the piezoelectric buzzer B1 is required to stop sounding, the control process is as follows:
(1) The base B of the transistor Q1 receives an external enable control signal from the input terminal EN, becomes a low level, the transistor Q1 is turned off, the collector C of the transistor Q1 is a high level, and the base B of the transistor Q2 is a high level, so that the transistor Q2 is turned off;
(2) The collector C of the transistor Q1 is high level, the grid G of the NMOS transistor Q3 is high level, the NMOS transistor Q3 is conducted, and the drain D of the NMOS transistor Q3 is stable low level;
(3) The drain electrode D of the NMOS tube Q3 is in a stable low level, so that the grid electrode G of the NMOS tube Q4 is also in a stable low level, the NMOS tube Q4 is cut off, and the oscillation control module 3 stops working;
(4) The oscillation control module 3 stops operating so that the step-up drive module 4 also stops operating, and the piezoelectric buzzer B1 stops emitting beeps.
When the piezoelectric buzzer B1 does not generate beeps, the transistors Q1, Q2 and Q4 are all turned off, so that the control module 1, the oscillation control module 2 and the boost driving module 4 have almost no current consumption; the NMOS transistor Q3 of the stabilizing module 3 is in a conducting state, but the operating principle of the NMOS transistor Q3 is voltage control, so that the stabilizing module 3 has almost no current consumption, and the stabilizing module 2 adopts NMOS transistor control, so that the static power consumption is low, and therefore, the piezoelectric buzzer driving circuit of the present application has extremely low standby power consumption.
Embodiment two:
the transistors Q1 and Q2 in the first embodiment may be replaced by other transistors with the same operation principle, such as MOS transistors.
Embodiment III:
the transistors Q3 and Q4 in the first embodiment may be replaced by other transistors with the same operation principle, such as bipolar transistors.
Embodiment four:
the transformer L1 in the first embodiment may be replaced with a normal transformer without taking the volume, cost, and efficiency into consideration.
The ingenious circuit connection of the piezoelectric buzzer driving circuit can be realized: when the transistor Q1 is turned on, the transistor Q2 is controlled to be turned on and the transistor Q3 is controlled to be turned off, the transistor Q2 is controlled to be turned on, the transistor Q4 is controlled to be turned on, and the oscillation control module works; after the oscillation control module works, when the capacitor C1 is charged and discharged, the transistor Q4 is in a switching state of on or off, so that the primary coil of the transformer L1 continuously oscillates, and the piezoelectric buzzer B1 emits continuous high-decibel beeping; the transistor Q1 is turned off, the transistor Q2 is controlled to be turned off and the transistor Q3 is controlled to be turned on, the transistor Q3 is turned on, the drain electrode D of the transistor Q3 outputs a stable low level, the grid electrode G of the NMOS transistor Q4 is also in the stable low level, the NMOS transistor Q4 is controlled to be turned off, the oscillation control module stops working, the boosting driving module 4 stops working, and the piezoelectric buzzer B1 stops emitting beeps.
In summary, in the piezoelectric buzzer driving circuit provided by the present application, since the transistors Q1, Q2, Q3 and Q4 are connected through smart circuits to control the piezoelectric buzzer B1 to emit or stop emitting the buzzer, when the piezoelectric buzzer B1 does not work, the current consumption of the transistors Q1, Q2, Q3 and Q4 is extremely low, so that the standby power consumption of the piezoelectric buzzer driving circuit is extremely low, and the piezoelectric buzzer driving circuit is more energy-saving; in addition, as the autotransformer is adopted, the secondary coil can obtain higher electromotive force through changing the transformation ratio design of the transformer L1, and the piezoelectric buzzer B1 sounds in a high decibel, so that the high decibel piezoelectric buzzer driving circuit is realized in a low-voltage power supply system, and the piezoelectric buzzer driving circuit can be widely used in an alarm with a longer service life of a battery.
The transistors used in embodiments of the present application may be any structure of transistors, such as field effect transistors (FETs, field Effect Transistor), or bipolar transistors (BJTs, bipolar Junction Transistor). When the transistor is an FET, the control electrode refers to a grid electrode, the first electrode refers to a drain electrode, and the second electrode refers to a source electrode; when the transistor is a BJT, the control electrode refers to a base electrode, the first electrode refers to a collector electrode, and the second electrode refers to an emitter electrode. When the transistor is used as a switch, the drain and source thereof may be interchanged according to the type of transistor actually used (e.g., P-type or N-type).
The foregoing is a further detailed description of the present application in connection with the specific embodiments, and it is not intended that the practice of the present application be limited to such descriptions. It will be apparent to those skilled in the art from this disclosure that several simple deductions or substitutions can be made without departing from the inventive concepts of the present application.
Claims (10)
1. A piezoelectric buzzer driving circuit, comprising: the system comprises an enabling control module, a stabilizing module, an oscillation control module and a boost driving module which are sequentially connected;
the enabling control module comprises a transistor Q1 and a transistor Q2, wherein a first electrode of the transistor Q1 is connected with a control electrode of the transistor Q2, and the control electrode is connected with an input end of the piezoelectric buzzer driving circuit and used for receiving an external enabling control signal; according to the external enabling control signal, the transistor Q1 controls the transistor Q2 to be turned off or turned on, when the transistor Q1 is turned off, the transistor Q2 is turned off, and when the transistor Q1 is turned on, the transistor Q2 is turned on;
the stabilizing module provides a stabilizing control signal for the oscillation control module and comprises a transistor Q3, wherein the control electrode of the transistor Q3 is connected with the first electrode of the transistor Q1; the transistor Q1 controls the transistor Q3 to be turned off or on according to the external enabling control signal, when the transistor Q1 is turned off, the transistor Q3 is turned on, and when the transistor Q1 is turned on, the transistor Q3 is turned off;
the oscillation control module comprises a transistor Q4 and a capacitor C1, wherein the control electrode of the transistor Q4 is connected with the first electrode of the transistor Q2 and the first electrode of the transistor Q3; when the transistor Q2 is turned on, the transistor Q2 controls the transistor Q4 to be turned on, the oscillation control module works, when the transistor Q3 is turned on, the transistor Q3 controls the transistor Q4 to be turned off, and the oscillation control module does not work; one end of the capacitor C1 is connected with the stabilizing module and the control electrode of the transistor Q4, and the other end of the capacitor C is connected with the boost driving module;
the boosting driving module comprises a transformer L1 and a piezoelectric buzzer B1, wherein a primary coil of the transformer L1 is connected with a first electrode of the transistor Q4, and a secondary coil of the transformer L1 is connected with a first pin and a second pin of the piezoelectric buzzer B1 in parallel; when the capacitor C1 is charged or discharged, the transistor Q4 is in a switching state of on or off, so that the oscillation control module controls the boost driving module to work, the primary coil of the transformer L1 continuously oscillates, and the piezoelectric buzzer B1 sounds due to piezoelectric effect.
2. The piezoelectric buzzer driving circuit of claim 1, wherein the third pin of the piezoelectric buzzer B1 is further connected to the capacitor C1, and outputs an oscillation feedback signal of the piezoelectric buzzer B1 to the capacitor C1, the capacitor C1 discharges to turn off the transistor Q4, the oscillation feedback signal beep_f is at a high level, and the oscillation feedback signal beep_f is at a low level when the transistor Q4 is turned on, and the capacitor C1 charges.
3. The piezoelectric buzzer driving circuit of claim 2, wherein when the oscillation control module is started, the transistor Q4 is turned on for the first time, so that the boost driving module is started, at this time, the oscillation feedback signal beep_f is first at a low level, the capacitor C1 is instantaneously discharged to turn off the transistor Q4, the oscillation feedback signal beep_f becomes a high level, and after the capacitor C1 is discharged, the transistor Q4 is turned on under the control of the transistor Q2, and the oscillation feedback signal beep_f becomes a low level again.
4. The piezoelectric buzzer driving circuit of claim 2, wherein the stabilizing module further comprises a diode D1, the diode D1 being connected in parallel with the transistor Q3, and being a voltage stabilizing diode for stabilizing the oscillation feedback signal beep_f to protect the transistor Q3.
5. The piezoelectric buzzer driving circuit of claim 2, wherein the oscillation control module further comprises a diode D2, the diode D2 being connected in parallel with the transistor Q4 and being a zener diode, the transistor Q4 being protected when the oscillation control module is in operation.
6. The piezoelectric buzzer driving circuit of claim 1, wherein the first electrode of the transistor Q3 is further connected to the first electrode of the transistor Q2, and when the transistor Q2 is on, in a saturated state, the stabilizing module is powered.
7. The piezoelectric buzzer driving circuit of claim 1, wherein the transformer L1 is an autotransformer.
8. The piezoelectric buzzer driving circuit of claim 7, wherein changing the transformation ratio of the transformer L1 is designed to make the secondary coil obtain a higher electromotive force, and the piezoelectric buzzer B1 sounds a high decibel.
9. The piezoelectric buzzer driving circuit of claim 1, wherein the transistor Q3 operates on a voltage controlled basis.
10. The piezoelectric buzzer driving circuit of any one of claims 1 through 9, wherein the transistors Q1, Q2, Q3 and Q4 comprise bipolar transistors or MOS transistors.
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| CN107599960B (en) * | 2017-07-31 | 2020-04-14 | 深圳市朗仁科技有限公司 | Buzzer driving circuit |
| CN109003597B (en) * | 2018-09-25 | 2023-11-03 | 华润微集成电路(无锡)有限公司 | Buzzer driving circuit and corresponding buzzer driving method |
| CN109272976B (en) * | 2018-10-25 | 2023-09-05 | 无锡十顶电子科技有限公司 | Buzzer driving circuit |
| CN111128105B (en) * | 2019-11-29 | 2022-09-23 | 深圳南云微电子有限公司 | Electromagnetic buzzer |
| CN113426651A (en) * | 2021-05-21 | 2021-09-24 | 四川步歌科技有限公司 | Ultrasonic circuit and pain therapeutic apparatus comprising same |
| CN113257213B (en) * | 2021-07-16 | 2021-09-14 | 深圳市泛海数据科技有限公司 | Dual-mode piezoelectric buzzer driving circuit and driving method |
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| JPH0819757A (en) * | 1994-07-08 | 1996-01-23 | Seikosha Co Ltd | Volumetric load drive circuit |
| CN201477871U (en) * | 2009-08-13 | 2010-05-19 | 合肥钦力电子有限公司 | back-up buzzer |
| JP2012037850A (en) * | 2010-08-05 | 2012-02-23 | Gcomm Corp | Piezoelectric buzzer driving circuit |
| CN203225104U (en) * | 2013-03-20 | 2013-10-02 | 杭州洲钜电子科技有限公司 | A boost application circuit used for a buzzer |
| CN206282605U (en) * | 2016-12-05 | 2017-06-27 | 深圳市泛海三江电子股份有限公司 | A kind of piezo buzzer drive circuit |
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| CN106531140A (en) | 2017-03-22 |
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Address after: 518054, Guangdong Shenzhen, Nanshan District Nanshan Road, glorious new world apartment three Applicant after: Shenzhen hi tech investment Sanjiang Electronics Co.,Ltd. Address before: 518054, Guangdong Shenzhen, Nanshan District Nanshan Road, glorious new world apartment three Applicant before: SHENZHEN FANHAI SANJIANG ELECTRONICS Co.,Ltd. |
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