CN214799326U - Driving circuit - Google Patents
Driving circuit Download PDFInfo
- Publication number
- CN214799326U CN214799326U CN202120983201.3U CN202120983201U CN214799326U CN 214799326 U CN214799326 U CN 214799326U CN 202120983201 U CN202120983201 U CN 202120983201U CN 214799326 U CN214799326 U CN 214799326U
- Authority
- CN
- China
- Prior art keywords
- square wave
- resistor
- module
- type triode
- negative
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
The utility model discloses a drive circuit belongs to acoustoelectric drive technical field, can guarantee the stability of piezoelectricity buzzing piece operation effect. The driving circuit comprises a square wave generation module, a negative square wave generation module, a control module and a power supply module; one end of the positive square wave generation module is connected with the power supply module and the control module, the other end of the positive square wave generation module is connected with the piezoelectric buzzer, one end of the negative square wave generation module is connected with the power supply module and the control module, and the other end of the negative square wave generation module is connected with the piezoelectric buzzer; the power module is used for providing a power supply for the piezoelectric buzzer through the positive wave generation module or the negative square wave generation module, and the control module is used for controlling the positive wave generation module to provide a positive wave signal for the piezoelectric buzzer or controlling the negative square wave generation module to provide a negative square wave signal for the piezoelectric buzzer.
Description
Technical Field
The utility model relates to an acoustoelectric drive technical field especially relates to a drive circuit.
Background
The piezoelectric buzzer is a passive device which fixes a ceramic chip after high-voltage polarization on a vibrating metal chip and then generates a piezoelectric effect by supplying an alternating current signal so as to work. Generally, the piezoelectric buzzer can generate sound only by applying an ac signal, but if the waveform of the ac signal is asymmetric or the amplitude is too small, the sound generating effect of the piezoelectric buzzer is distorted, and therefore, those skilled in the art have made efforts to develop a circuit capable of ensuring the sound generating effect of the piezoelectric buzzer to be stable by a simple circuit structure.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned defect of prior art, the utility model aims to solve the technical problem of how to guarantee the stability of piezoelectricity buzzer buzzing piece operation effect.
In order to achieve the above object, the present invention provides a driving circuit for driving a piezoelectric buzzer, the driving circuit includes a square wave generating module, a negative square wave generating module, a control module and a power module; one end of the positive square wave generation module is connected with the power supply module and the control module, the other end of the positive square wave generation module is connected with the piezoelectric buzzer, one end of the negative square wave generation module is connected with the power supply module and the control module, and the other end of the negative square wave generation module is connected with the piezoelectric buzzer; the power module is used for passing through square wave generation module or negative square wave generation module does piezoelectricity buzzer piece provides the power, control module is used for controlling square wave generation module does piezoelectricity buzzer piece provides positive square wave signal, perhaps controls negative square wave generation module does piezoelectricity buzzer piece provides negative square wave signal.
In a preferred embodiment of the present invention, the control module is configured to control the negative square wave generating module to be in a non-operating state under the condition that the positive square wave generating module is controlled to provide a positive square wave signal for the piezoelectric buzzer; and under the condition that the negative square wave generating module is controlled to provide a negative square wave signal for the piezoelectric buzzer, the positive square wave generating module is controlled to be in a non-working state.
In a preferred embodiment of the present invention, the control module includes a signal source, a first power source, a first NPN transistor, a first resistor, a second resistor, a third resistor, and a fourth resistor; the positive electrode of the signal source is respectively connected with the first end of the first resistor and the first end of the second resistor, and the negative electrode of the signal source is grounded; the second end of the first resistor is connected with the base of the first NPN type triode, the first end of the third resistor is connected between the base of the first NPN type triode and the second end of the first resistor, the second end of the third resistor is respectively connected with a ground terminal and the emitting electrode of the first NPN type triode, the second end of the second resistor is connected with the negative square wave generating module, the positive electrode of the first power supply is connected with the first end of the fourth resistor, the negative electrode of the first power supply is grounded, and the second end of the fourth resistor is respectively connected with the collector of the first NPN type triode and the square wave generating module.
In the preferred embodiment of the present invention, the circuit structure of the square wave generating module is the same as the circuit structure of the negative square wave generating module.
In a preferred embodiment of the present invention, the square wave generating module comprises: the second NPN type triode, the first PNP type triode, the fifth resistor and the sixth resistor; the base electrode of the second NPN type triode is connected with the control module, the collector electrode of the second NPN type triode is connected with the first end of the fifth resistor and the first end of the piezoelectric buzzer, the first end of the sixth resistor is connected with the base electrode of the second NPN type triode, the second end of the sixth resistor is respectively connected with the grounding end and the emitting electrode of the second NPN type triode, the second end of the fifth resistor is connected with the base electrode of the first PNP type triode, the emitting electrode of the first PNP type triode is connected with the power supply module, and the collector electrode of the first PNP type triode is connected with the second end of the piezoelectric buzzer.
The utility model discloses an in the preferred embodiment, this square wave generation module still includes first zener diode, first zener diode's anodal ground connection, the negative pole is connected the collecting electrode of first PNP type triode with between the second end of piezoelectricity buzzer piece.
In a preferred embodiment of the present invention, the negative square wave generating module comprises: the third NPN type triode, the second PNP type triode, the seventh resistor and the eighth resistor; the base electrode of the third NPN type triode is connected with the control module, the collector electrode of the third NPN type triode is connected with the first end of the seventh resistor and the second end of the piezoelectric buzzer, the first end of the eighth resistor is connected with the base electrode of the third NPN type triode, the second end of the eighth resistor is respectively connected with the grounding end and the emitting electrode of the third NPN type triode, the second end of the seventh resistor is connected with the base electrode of the second PNP type triode, the emitting electrode of the second PNP type triode is connected with the power supply module, and the collector electrode of the second PNP type triode is connected with the first end of the piezoelectric buzzer.
The utility model discloses an in the preferred embodiment, this negative square wave generation module still includes second zener diode, second zener diode's positive ground, the negative pole is connected the collecting electrode of second PNP type triode with between the first end of piezoelectricity buzzer piece.
The present invention provides a power supply module, which comprises a second power supply and a ninth resistor, wherein the negative electrode of the second power supply is grounded and the positive electrode of the second power supply is connected to the first end of the ninth resistor, and the second end of the ninth resistor is connected to the square wave generating module and the negative square wave generating module respectively.
The utility model provides a driving circuit, which comprises a square wave generation module, a negative square wave generation module, a control module and a power module; the power module is used for providing a power supply for the piezoelectric buzzer, and the control module is used for controlling the square wave generation module to provide a square wave signal for the piezoelectric buzzer or controlling the negative square wave generation module to provide a negative square wave signal for the piezoelectric buzzer. Through this scheme, because square wave generation module can provide square wave signal for piezoelectricity buzzer, negative square wave generation module can provide negative square wave signal for piezoelectricity buzzer, consequently, piezoelectricity buzzer can obtain a stable complete wave signal to realize stable operation effect.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.
Drawings
Fig. 1 is a schematic diagram of a frame of a driving circuit provided by the present invention;
fig. 2 is one of the circuit diagrams of the driving circuit provided by the present invention;
fig. 3 is a second circuit diagram of the driving circuit provided by the present invention;
fig. 4 is a waveform diagram of the piezoelectric buzzer provided by the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
In order to facilitate clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present invention, words such as "first" and "second" are used to distinguish the same items or similar items with substantially the same functions and actions. For example, the first capacitor and the second capacitor are only used for distinguishing different capacitors, and the sequence order of the capacitors is not limited. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.
Some exemplary embodiments of the invention have been described for illustrative purposes, and it is to be understood that the invention may be practiced otherwise than as specifically described.
As shown in fig. 1, the present invention provides a driving circuit for driving a piezoelectric buzzer, which may include a square wave generating module 100, a negative square wave generating module 101, a control module 102 and a power module 103. The positive square wave generating module 100 is connected with the power module 103 and the control module 102 at one end, and is connected with the piezoelectric buzzer at the other end, and the negative square wave generating module 101 is connected with the power module 103 and the control module 102 at one end and is connected with the piezoelectric buzzer at the other end.
Under the action of the power module 103 and the control module 102, the square wave generation module 100 may provide a square wave signal for the piezoelectric buzzer, and the negative square wave generation module 101 may provide a negative square wave signal for the piezoelectric buzzer. Specifically, the power module 103 may be configured to provide a power source for the piezoelectric buzzer through the positive square wave generating module or the negative square wave generating module, the control module 102 may be configured to control the positive square wave generating module 100 to provide a positive square wave signal for the piezoelectric buzzer, or control the negative square wave generating module 101 to provide a negative square wave signal for the piezoelectric buzzer, and the piezoelectric buzzer may be configured to keep operating normally under the driving of the positive square wave signal and the negative square wave signal.
Optionally, the control module 102 may be configured to control the negative square wave generating module to be in a non-working state under the condition that the positive square wave generating module is controlled to provide a positive square wave signal for the piezoelectric buzzer; and under the condition that the negative square wave generating module is controlled to provide a negative square wave signal for the piezoelectric buzzer, the positive square wave generating module is controlled to be in a non-working state. The circuit configuration of the square wave generation module 100 is the same as that of the negative square wave generation module 101.
The following provides a detailed description of examples of the present application.
As shown in fig. 2, the control module 102 may include a signal source XFG1, a first power source V1, a first NPN transistor Q11, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The positive pole of the signal source XFG1 is respectively connected with the first end of the first resistor R1 and the first end of the second resistor R2, and the negative pole of the signal source XFG1 is grounded. A second end of the first resistor R1 is connected to a base of the first NPN transistor Q11, a first end of the third resistor R3 is connected between the base of the first NPN transistor Q11 and a second end of the first resistor R1, a second end of the third resistor R3 is connected to a ground terminal and an emitter of the first NPN transistor Q11, a second end of the second resistor R2 is connected to the negative square wave generating module 101, a positive electrode of the first power source V1 is connected to a first end of the fourth resistor R4, a negative electrode of the first power source V1 is grounded, and a second end of the fourth resistor R4 is connected to a collector of the first NPN transistor Q11 and the square wave generating module 100.
With continued reference to fig. 2, the square wave generation module 100 may include: a second NPN transistor Q12, a first PNP transistor Q21, a fifth resistor R5, and a sixth resistor R6. The base of the second NPN type triode Q12 is connected to the control module 102, the collector of the second NPN type triode Q12 is connected to the first end of the fifth resistor R5 and the first end of the piezoelectric buzzer C1, the first end of the sixth resistor R6 is connected to the base of the second NPN type triode Q12, the second end of the sixth resistor R6 is connected to the ground terminal and the emitter of the second NPN type triode Q12, the second end of the fifth resistor R5 is connected to the base of the first PNP type triode Q21, the emitter of the first PNP type triode Q21 is connected to the power module 103, and the collector of the first PNP type triode Q21 is connected to the second end of the piezoelectric buzzer C1.
The negative square wave generation module 101 may include: a third NPN transistor Q13, a second PNP transistor Q22, a seventh resistor R7, and an eighth resistor R8. A base electrode of the third NPN type triode Q13 is connected to the control module 102, a collector electrode of the third NPN type triode Q13 is connected to a first end of the seventh resistor R7 and a second end of the piezoelectric buzzer C1, a first end of the eighth resistor R8 is connected to a base electrode of the third NPN type triode Q13, a second end of the eighth resistor R8 is connected to a ground terminal and an emitter electrode of the third NPN type triode Q13, a second end of the seventh resistor R7 is connected to a base electrode of the second PNP type triode Q22, an emitter electrode of the second PNP type triode Q22 is connected to the power module 103, and a collector electrode of the second PNP type triode Q22 is connected to a first end of the piezoelectric buzzer C1.
Optionally, with continued reference to fig. 2, the power module 103 may include a second power source V2 and a ninth resistor R9, a negative electrode of the second power source V2 is grounded, a positive electrode of the second power source V is connected to a first end of the ninth resistor R9, and a second end of the ninth resistor R9 is connected to the square wave generating module 100 and the negative square wave generating module 101, respectively.
The following explains the implementation principle of the driving circuit in detail:
the signal source XFG1 may be a Pulse Width Modulation (PWM) signal output port of a signal generator or a Micro Controller Unit (MCU), and the PWM signal may be a TTL level of 3.3V or 5V. In actual operation, the signal source XFG1 may output a fixed frequency PWM signal with an adjustable duty cycle.
When the signal source XFG1 outputs a high level, the base of the first NPN transistor Q11 and the base of the third NPN transistor Q13 are both at a high level, so the first NPN transistor Q11 and the third NPN transistor Q13 are both in an on state, and the base of the second NPN transistor Q12 is pulled low by the collector of the first NPN transistor Q11, so the second NPN transistor Q12 is in an off state, and the first PNP transistor Q21 is also in an off state. Since the third NPN transistor Q13 is in the on state, the base of the second PNP transistor Q22 is pulled low by the collector of the third NPN transistor Q13, and thus the second PNP transistor Q22 is also in the on state. That is, when the signal source XFG1 outputs a high level, the first NPN transistor Q11, the third NPN transistor Q13, and the second PNP transistor Q22 are in an on state, and the second NPN transistor Q12 and the first PNP transistor Q21 are in an off state.
When the signal source XFG1 outputs a low level, the base of the first NPN transistor Q11 and the base of the third NPN transistor Q13 are both at a low level, and therefore, the first NPN transistor Q11 and the third NPN transistor Q13 are both in an off state, and the second PNP transistor Q22 is also in an off state. At this time, the first power source V1 may provide a high voltage to the base of the second NPN transistor Q12, so that the second NPN transistor Q12 is in a conducting state, and the base of the first PNP transistor Q21 is pulled low by the collector of the second NPN transistor Q12, so that the first PNP transistor Q21 is also in a conducting state. That is, when the signal source XFG1 outputs a low level, the second NPN transistor Q12 and the first PNP transistor Q21 are in an on state, and the first NPN transistor Q11, the third NPN transistor Q13, and the second PNP transistor Q22 are in an off state.
Further, the second power supply V2 provides power for the piezoelectric buzzer C1, and when the first PNP transistor Q21 is in an on state and the second PNP transistor Q22 is in an off state, the first PNP transistor Q21 provides a square wave signal to the piezoelectric buzzer C1; in the case where the first PNP transistor Q21 is in the off state and the second PNP transistor Q22 is in the on state, the second PNP transistor Q22 supplies a negative square wave signal to the piezoelectric buzzer C1. Because the signal source XFG1 can continuously output signals with fixed frequency, the piezoelectric buzzer C1 can receive square wave signals and negative square wave signals with fixed frequency, so as to obtain a stable all-directional wave signal, and further achieve the purpose of outputting stable buzzer sound.
Optionally, with continued reference to fig. 2, the square wave generating module 100 may further include a first zener diode D1, wherein an anode of the first zener diode D1 is grounded, and a cathode of the first zener diode D1 is connected between a collector of the first PNP transistor Q21 and the second end of the piezoelectric buzzer C1. The negative square wave generating module 101 may further include a second zener diode D2, wherein the positive electrode of the second zener diode D2 is grounded, and the negative electrode of the second zener diode D2 is connected between the collector of the second PNP transistor Q22 and the first end of the piezoelectric buzzer C1. Under the coordination of the ninth resistor R9 in the power module 103, the first zener diode D1 can keep the voltage of the piezoelectric buzzer C1 in a fixed voltage range when the square wave generating module 100 is turned on; under the condition that the negative square wave generating module 101 is turned on, the second zener diode D2 can maintain the voltage of the piezoelectric buzzer C1 within a fixed voltage value range. For example, in the case where the second power source V2 is a 24V dc regulated power supply, D1 or D2 may maintain the voltage of the piezoelectric buzzer C1 at 15V.
Optionally, the first power source V1 may be a 3.3V or 5V dc power source; the second power supply V2 can be a DC stabilized power supply, a lithium battery pack and other devices; the piezoelectric buzzer C1 can be equivalent to a capacitance of 20 nF.
As shown in fig. 3, an oscilloscope XSC1 may be connected to both ends of the piezoelectric buzzer chip C1 to test the waveform on the piezoelectric buzzer chip C1 in actual operation.
Illustratively, as shown in fig. 4, when a TTL signal with a frequency of 1K, a duty cycle of 50%, and a voltage of 3.3V is output to the signal source XFG1, a voltage waveform is generated across the piezoelectric buzzer C1. The voltage waveforms of the two ends of the piezoelectric buzzer piece C1 are in the channel 1 and the channel 2, and the voltage difference between the channel 1 and the channel 2, that is, the voltage at the two ends of the piezoelectric buzzer piece C1, is in the channel M. When passageway 1 is +15V, passageway 2 is 0V, and piezoelectricity buzzer patch C1 both ends voltage is +15V (positive square wave) promptly, and when passageway 1 was 0V, passageway 2 was +15V, and piezoelectricity buzzer patch C1 both ends voltage was-15V (negative square wave), consequently, through the utility model provides a circuit has accomplished the effect of using single PWM to realize full square wave drive piezoelectricity buzzer patch.
The utility model provides a driving circuit, which comprises a square wave generation module, a negative square wave generation module, a control module and a power module; the power module is used for providing a power supply for the piezoelectric buzzer, and the control module is used for controlling the square wave generation module to provide a square wave signal for the piezoelectric buzzer or controlling the negative square wave generation module to provide a negative square wave signal for the piezoelectric buzzer. Through this scheme, because square wave generation module can provide square wave signal for piezoelectricity buzzer, negative square wave generation module can provide negative square wave signal for piezoelectricity buzzer, consequently, piezoelectricity buzzer can obtain a stable complete wave signal to realize stable operation effect.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A driving circuit for driving a piezoelectric buzzer, comprising: the device comprises a square wave generation module, a negative square wave generation module, a control module and a power supply module; one end of the positive square wave generation module is connected with the power supply module and the control module, the other end of the positive square wave generation module is connected with the piezoelectric buzzer, one end of the negative square wave generation module is connected with the power supply module and the control module, and the other end of the negative square wave generation module is connected with the piezoelectric buzzer;
the power module is used for passing through square wave generation module or negative square wave generation module does piezoelectricity buzzer piece provides the power, control module is used for controlling square wave generation module does piezoelectricity buzzer piece provides positive square wave signal, perhaps controls negative square wave generation module does piezoelectricity buzzer piece provides negative square wave signal.
2. The driving circuit according to claim 1, wherein the control module is configured to control the negative square wave generating module to be in a non-operating state under the condition that the positive square wave generating module is controlled to provide a positive square wave signal for the piezoelectric buzzer; and under the condition that the negative square wave generating module is controlled to provide a negative square wave signal for the piezoelectric buzzer, the positive square wave generating module is controlled to be in a non-working state.
3. The driving circuit of claim 2, wherein the control module comprises a signal source, a first power source, a first NPN transistor, a first resistor, a second resistor, a third resistor, and a fourth resistor; the positive electrode of the signal source is respectively connected with the first end of the first resistor and the first end of the second resistor, and the negative electrode of the signal source is grounded; the second end of the first resistor is connected with the base of the first NPN type triode, the first end of the third resistor is connected between the base of the first NPN type triode and the second end of the first resistor, the second end of the third resistor is respectively connected with a ground terminal and the emitting electrode of the first NPN type triode, the second end of the second resistor is connected with the negative square wave generating module, the positive electrode of the first power supply is connected with the first end of the fourth resistor, the negative electrode of the first power supply is grounded, and the second end of the fourth resistor is respectively connected with the collector of the first NPN type triode and the square wave generating module.
4. The drive circuit according to claim 1, wherein a circuit configuration of the positive square wave generating module is the same as a circuit configuration of the negative square wave generating module.
5. The driving circuit of claim 4, wherein the positive square wave generating module comprises: the second NPN type triode, the first PNP type triode, the fifth resistor and the sixth resistor; the base electrode of the second NPN type triode is connected with the control module, the collector electrode of the second NPN type triode is connected with the first end of the fifth resistor and the first end of the piezoelectric buzzer, the first end of the sixth resistor is connected with the base electrode of the second NPN type triode, the second end of the sixth resistor is respectively connected with the grounding end and the emitting electrode of the second NPN type triode, the second end of the fifth resistor is connected with the base electrode of the first PNP type triode, the emitting electrode of the first PNP type triode is connected with the power supply module, and the collector electrode of the first PNP type triode is connected with the second end of the piezoelectric buzzer.
6. The driving circuit of claim 5, wherein the positive wave generation module further comprises a first zener diode, an anode of the first zener diode is grounded, and a cathode of the first zener diode is connected between the collector of the first PNP transistor and the second end of the piezoelectric buzzer.
7. The driving circuit of claim 4, wherein the negative square wave generating module comprises: the third NPN type triode, the second PNP type triode, the seventh resistor and the eighth resistor; the base electrode of the third NPN type triode is connected with the control module, the collector electrode of the third NPN type triode is connected with the first end of the seventh resistor and the second end of the piezoelectric buzzer, the first end of the eighth resistor is connected with the base electrode of the third NPN type triode, the second end of the eighth resistor is respectively connected with the grounding end and the emitting electrode of the third NPN type triode, the second end of the seventh resistor is connected with the base electrode of the second PNP type triode, the emitting electrode of the second PNP type triode is connected with the power supply module, and the collector electrode of the second PNP type triode is connected with the first end of the piezoelectric buzzer.
8. The driving circuit of claim 7, wherein the negative square wave generating module further comprises a second zener diode, an anode of the second zener diode is grounded, and a cathode of the second zener diode is connected between the collector of the second PNP transistor and the first end of the piezoelectric buzzer.
9. The driving circuit according to any one of claims 1 to 8, wherein the power supply module comprises a second power supply and a ninth resistor, a negative electrode of the second power supply is grounded, a positive electrode of the second power supply is connected to a first end of the ninth resistor, and a second end of the ninth resistor is connected to the positive wave generation module and the negative wave generation module respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120983201.3U CN214799326U (en) | 2021-05-10 | 2021-05-10 | Driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120983201.3U CN214799326U (en) | 2021-05-10 | 2021-05-10 | Driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214799326U true CN214799326U (en) | 2021-11-19 |
Family
ID=78692670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120983201.3U Active CN214799326U (en) | 2021-05-10 | 2021-05-10 | Driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214799326U (en) |
-
2021
- 2021-05-10 CN CN202120983201.3U patent/CN214799326U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210246610U (en) | Controllable high-voltage power pulse generating circuit | |
| CN214799326U (en) | Driving circuit | |
| CN110247644A (en) | Micro EDM nanosecond pulse power supply based on avalanche transistor | |
| CN103929155B (en) | Pulse width broadening circuit | |
| CN208272940U (en) | A kind of pulse signal generator | |
| CN203851113U (en) | Day-night switching bird repelling device | |
| CN109474239A (en) | 5G standard source high-frequency crystal oscillator circuit | |
| US8247995B2 (en) | Control system for multiple light sources | |
| KR101616231B1 (en) | High voltage generation apparatus for generating an ion | |
| CN112332637A (en) | Adjustable PWM drive control circuit | |
| CN115407171A (en) | PCB (printed circuit board), and diode characteristic testing system and method | |
| CN100459431C (en) | Circuit for optimizing Zener diode bias current | |
| CN108696267B (en) | Driving device and driving method of field effect transistor and power supply device | |
| CN211318544U (en) | Signal generator | |
| CN218826152U (en) | LED display intelligent two-in-one controller | |
| CN106712471B (en) | PWM power control device | |
| CN104014472B (en) | Supersonic generator | |
| CN218603370U (en) | Laser radar photoelectric conversion booster circuit | |
| CN217469909U (en) | Pulse signal generating circuit and electronic device | |
| CN216774736U (en) | Double-pulse generating circuit with negative voltage output and adjustable pulse width frequency number | |
| CN215498730U (en) | Passive voltage doubling circuit of DC power supply | |
| CN213023465U (en) | High-speed switch circuit and test equipment for switch transient interruption | |
| CN203851111U (en) | Bird repelling circuit | |
| CN211702385U (en) | Frequency-following electronic horn | |
| CN219837291U (en) | Power output control circuit of inverter welding machine, circuit board and inverter welding machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |