CN214543622U - Electrostatic protection circuit for buzzer driving chip power supply - Google Patents
Electrostatic protection circuit for buzzer driving chip power supply Download PDFInfo
- Publication number
- CN214543622U CN214543622U CN202120538932.7U CN202120538932U CN214543622U CN 214543622 U CN214543622 U CN 214543622U CN 202120538932 U CN202120538932 U CN 202120538932U CN 214543622 U CN214543622 U CN 214543622U
- Authority
- CN
- China
- Prior art keywords
- signal line
- chip power
- power supply
- chip
- electrostatic discharge
- 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
- Semiconductor Integrated Circuits (AREA)
Abstract
The utility model provides an electrostatic protection circuit for buzzer driver chip power, including resistance R1, one-way conductive device, electrostatic discharge device. The signal line VDD is a power supply signal line of a functional module in the chip, one end of the resistor R1 is connected with the signal line VDD, the other end of the resistor R1 is connected with the chip power supply VCC, one end of the unidirectional conductive device is connected with the chip power supply VCC, the other end of the unidirectional conductive device is connected with the signal line A, one end of the electrostatic discharge device is connected with the signal line A, and the other end of the electrostatic discharge device is connected with the ground wire. This circuit is through when chip power VCC adds reverse normal operating voltage with the ground wire, one-way conductive device and electrostatic discharge device at least one device be the off-state to and resistance R1 carries out the current-limiting to the inside functional module of chip, play the existing electrostatic protection function of chip power VCC, prevent the effect that chip was burnt out when chip power VCC connects reversely again, this circuit has with low costs and the advantage of high performance.
Description
Technical Field
The utility model relates to a buzzer circuit field, concretely relates to an electrostatic protection circuit and buzzer driver chip for buzzer driver chip power.
Background
As shown in fig. 9, the conventional electrostatic protection circuit for the buzzer driving chip power supply may cause a large current to pass through the electrostatic discharge device between the ground line and the chip power supply VCC when the chip power supply VCC is connected with the ground line in an inverse manner, as shown in fig. 10, the power supply VCC electrostatic protection of the buzzer driving chip adopts such a circuit, when the chip power supply VCC is connected with the ground line in an inverse manner, the NMOS transistor N1 may have a large current to pass through, which may cause burning of the NMOS transistor N1, thereby causing failure of the buzzer driving chip, the internal functional module of the chip may also have similar large current to cause damage to the circuit, and during electrostatic protection, the internal functional module of the chip may also be damaged prior to the electrostatic discharge device.
SUMMERY OF THE UTILITY MODEL
The utility model provides an electrostatic protection circuit for buzzer driver chip power to solve buzzer driver chip power cord and ground wire and connect when reverse, cause the problem that chip electrostatic discharge device and chip internal function module damaged easily, and further improve chip internal function module's electrostatic protection ability.
In order to solve the above technical problem, the utility model provides an electrostatic protection circuit for buzzer driver chip power, as shown in fig. 1, including resistance R1, one-way conductive device, electrostatic discharge device. The signal line VDD is a power supply signal line of a functional module in the chip, one end of the resistor R1 is connected with the signal line VDD, the other end of the resistor R1 is connected with the chip power supply VCC, one end of the unidirectional conductive device is connected with the chip power supply VCC, the other end of the unidirectional conductive device is connected with the signal line A, one end of the electrostatic discharge device is connected with the signal line A, and the other end of the electrostatic discharge device is connected with the ground wire.
As shown in fig. 1, under the condition that the normal operating voltage is applied from the chip power source VCC to the signal line a and from the signal line a to the ground, at least one of the unidirectional conductive device and the electrostatic discharge device is in an off state, for example: the normal working voltage is 5V, when the voltage of-5V is added from the chip power supply VCC to the signal line A, the one-way conductive device is cut off, when the voltage of-5V is added from the signal line A to the ground wire, the electrostatic discharge device is switched on, and when the buzzer drives the chip power supply VCC to be reversely connected with the ground wire, the one-way conductive device is cut off, so that the ground wire and the chip power supply VCC are in a cut-off state, and the chip electrostatic discharge device and the one-way conductive device can not be damaged; similarly, the conducting directions of the unidirectional conducting device and the electrostatic discharging device can be interchanged, such as: the normal operating voltage is 5V, when-5V voltage is added from the chip power supply VCC to the signal line A, the one-way conductive device is conducted, when-5V voltage is added from the signal line A to the ground wire, the electrostatic discharge device is cut off, when the buzzer drives the chip power supply VCC to be reversely connected with the ground wire, the electrostatic discharge device is cut off, so that the ground wire and the chip power supply VCC are in a cut-off state, and the chip electrostatic discharge device and the one-way conductive device cannot be damaged. Properly select the resistance of resistance R1, when bee calling organ drive chip VCC and ground connection were in the reverse direction, resistance R1 can carry out the current-limiting to the inside function module of chip to prevent that the inside function module of chip from being damaged because of the electric current is too big, in addition during electrostatic protection, resistance R1 can carry out the current-limiting to the inside function module of chip, make static mainly discharge through one-way conductive device and electrostatic discharge device, thereby improve the electrostatic protection ability of the inside function module of chip. The other scheme of the connection relation between the unidirectional conductive device and the electrostatic discharge device is as follows: one end of the electrostatic discharge device is connected with the chip power supply VCC, the other end of the electrostatic discharge device is connected with the signal line A, one end of the one-way conductive device is connected with the signal line A, and the other end of the one-way conductive device is connected with the ground wire. The chip internal functional module refers to other circuits in the chip except for a port circuit connected with a port, such as an oscillator and other functional module circuits.
Preferably, the unidirectional current conducting device refers to three devices: diode, triode, MOS pipe.
Preferably, the electrostatic discharge device is a commonly used electrostatic protection discharge device, and the commonly used devices include: diode, triode, MOS pipe, silicon controlled rectifier.
To sum up, this circuit is through when chip power VCC adds reverse normal operating voltage with the ground wire, one-way conductive device and electrostatic discharge device at least one device be the off-state to and resistance R1 carries out the current-limiting to the inside functional module of chip, play the existing electrostatic protection function of chip power VCC, prevent the effect that chip was burnt out when chip power VCC connects reversely again, this circuit has with low costs and the high advantage of performance.
Drawings
Fig. 1 is a schematic structural diagram of an electrostatic protection circuit for a buzzer driving chip power supply of the present invention.
Fig. 2 is a schematic diagram of an electrostatic protection circuit for a buzzer driving chip power supply according to a first embodiment of the present invention.
Fig. 3 is a schematic diagram of an electrostatic protection circuit for a buzzer driving chip power supply according to a second embodiment of the present invention.
Fig. 4 is a schematic diagram of an electrostatic protection circuit for a buzzer driving chip power supply according to a third embodiment of the present invention.
Fig. 5 is a schematic diagram of an electrostatic protection circuit for a buzzer driving chip power supply according to a fourth embodiment of the present invention.
Fig. 6 is a schematic diagram of an electrostatic protection circuit for a buzzer driving chip power supply according to a fifth embodiment of the present invention.
Fig. 7 is a schematic diagram of an electrostatic protection circuit for a buzzer driving chip power supply according to a sixth embodiment of the present invention.
Fig. 8 is a schematic diagram of an electrostatic protection circuit for a buzzer driving chip power supply according to a seventh embodiment of the present invention.
Fig. 9 is a schematic diagram of a prior art circuit.
FIG. 10 is a circuit schematic of a prior art embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the utility model provides a pair of an electrostatic protection circuit for buzzer driver chip power, including resistance R1, one-way conductive device, electrostatic discharge device. The signal line VDD is a power supply signal line of a functional module in the chip, one end of the resistor R1 is connected with the signal line VDD, the other end of the resistor R1 is connected with the chip power supply VCC, one end of the unidirectional conductive device is connected with the chip power supply VCC, the other end of the unidirectional conductive device is connected with the signal line A, one end of the electrostatic discharge device is connected with the signal line A, and the other end of the electrostatic discharge device is connected with the ground wire.
As shown in fig. 1, under the condition that the normal operating voltage is applied from the chip power source VCC to the signal line a and from the signal line a to the ground, at least one of the unidirectional conductive device and the electrostatic discharge device is in an off state, for example: the normal working voltage is 5V, when the voltage of-5V is added from the chip power supply VCC to the signal line A, the one-way conductive device is cut off, when the voltage of-5V is added from the signal line A to the ground wire, the electrostatic discharge device is switched on, and when the buzzer drives the chip power supply VCC to be reversely connected with the ground wire, the one-way conductive device is cut off, so that the ground wire and the chip power supply VCC are in a cut-off state, and the chip electrostatic discharge device and the one-way conductive device can not be damaged; similarly, the normal working voltage is 5V, when the voltage of-5V is applied from the chip power supply VCC to the signal line A, the one-way conductive device is switched on, when the voltage of-5V is applied from the signal line A to the ground wire, the electrostatic discharge device is switched off, and when the buzzer drives the chip power supply VCC to be reversely connected with the ground wire, the electrostatic discharge device is switched off, so that the ground wire and the chip power supply VCC are in a cut-off state, and the chip electrostatic discharge device and the one-way conductive device can not be damaged. As shown in fig. 1, the functional module inside the chip refers to an oscillator, a frequency divider, a power-on reset and other module circuits with certain functions inside the chip except for the port circuit, the port circuit refers to a device connected to the port and an electrostatic protection circuit thereof, and the resistor R1 has two functions: one effect is that resistance R1 can carry out the current-limiting to the inside function module of chip when buzzer driver chip power VCC connects reverse with the ground wire to prevent that the inside function module of chip from being damaged because of the electric current is too big, and another effect is when electrostatic protection, resistance R1 can carry out the current-limiting to the inside function module of chip, makes static mainly discharge through one-way conductive device and electrostatic discharge device, thereby improves the electrostatic protection ability of the inside function module of chip.
The first embodiment of the present invention, as shown in fig. 2: the electrostatic discharge device comprises a resistor R1, a diode D1 and an electrostatic discharge device. The signal line VDD is a power supply signal line of a functional module in the chip, one end of the resistor R1 is connected with the signal line VDD, the other end of the resistor R1 is connected with the chip power supply VCC, the anode of the diode D1 is connected with the chip power supply VCC, the cathode of the diode D1 is connected with the signal line A, one end of the electrostatic discharge device is connected with the signal line A, and the other end of the electrostatic discharge device is connected with the ground wire.
The utility model discloses a first embodiment combines fig. 2, and the unidirectional conducting device is the diode in this embodiment, when chip power VCC and ground wire reverse connection, when chip power VCC adds reverse normal operating voltage to the ground wire promptly, diode D1 ends to be in the off-state between ground wire and the chip power VCC, chip electrostatic discharge device and diode D1 all can not damaged.
The second embodiment of the present invention, as shown in fig. 3: the device comprises an NPN triode Q1, a diode D1 and an electrostatic discharge device. The signal line VDD is a power supply signal line of a functional module in the chip, one end of a resistor R1 is connected with the signal line VDD, the other end of a resistor R1 is connected with a chip power supply VCC, a collector of an NPN triode Q1 is connected with the chip power supply VCC, a base and an emitter of the NPN triode Q1 are both connected with a signal line A, one end of an electrostatic discharge device is connected with the signal line A, and the other end of the electrostatic discharge device is connected with a ground wire.
The utility model discloses a second embodiment combines fig. 3, and the unidirectional conducting device is the NPN triode of diode connection in this embodiment, connects when reverse at chip power VCC and ground wire, when chip power VCC adds reverse normal operating voltage to the ground wire promptly, NPN triode Q1 ends to be in the off-state between ground wire and the chip power VCC, chip electrostatic discharge device and NPN triode Q1 all can not damaged.
The third embodiment of the present invention is shown in fig. 4: the device comprises a resistor R1, a diode D1 and an NMOS transistor N1. The signal line VDD is a power supply signal line of a functional module in the chip, one end of a resistor R1 is connected with the signal line VDD, the other end of a resistor R1 is connected with a chip power supply VCC, the anode of a diode D1 is connected with the chip power supply VCC, the cathode of a diode D1 is connected with a signal line A, the drain end of an NMOS tube N1 is connected with the signal line A, the source of an NMOS tube N1 is connected with a ground wire, the gate of the NMOS tube N1 is connected with a ground wire, and the substrate of the NMOS tube N1 is connected with the ground wire.
The utility model discloses a third embodiment combines fig. 4, and the unidirectional conducting device is the diode in this embodiment, and the electrostatic discharge device is NMOS pipe N1, connects when reverse at chip power VCC and ground wire, when chip power VCC adds reverse normal operating voltage to the ground wire promptly, and diode D1 ends to be in the off-state between ground wire and the chip power VCC, NMOS pipe N1 and diode D1 all can not damaged.
The fourth embodiment of the present invention is shown in fig. 5: the device comprises a resistor R1, an NMOS tube N1 and a diode D1. The signal line VDD is a power supply signal line of a functional module in the chip, one end of a resistor R1 is connected with the signal line VDD, the other end of the resistor R1 is connected with a chip power supply VCC, the drain end of an NMOS tube N1 is connected with the chip power supply VCC, the source electrode of the NMOS tube N1 is connected with a signal line A, the grid electrode of the NMOS tube N1 is connected with the signal line A, the substrate of the NMOS tube N1 is connected with the signal line A, the anode of a diode D1 is connected with the signal line A, and the cathode of the diode D1 is connected with the ground wire.
The utility model discloses a fourth embodiment combines fig. 5, and the unidirectional conducting device is the NMOS pipe in this embodiment, and the electrostatic discharge device is the diode, connects when reverse at chip power VCC and ground wire, when chip power VCC adds reverse normal operating voltage to the ground wire promptly, and diode D1 ends to be in the off-state between ground wire and the chip power VCC, NMOS pipe N1 and diode D1 all can not damaged.
The fifth embodiment of the present invention is shown in fig. 6: the circuit comprises a resistor R1, a diode D1 and a diode D3. The signal line VDD is a power supply signal line of a functional module inside the chip, one end of the resistor R1 is connected with the signal line VDD, the other end of the resistor R1 is connected with the chip power supply VCC, the anode of the diode D1 is connected with the chip power supply VCC, the cathode of the diode D1 is connected with the signal line A, the cathode of the diode D3 is connected with the signal line A, and the anode of the diode D3 is connected with the ground wire.
The utility model discloses a fifth embodiment combines fig. 6, and the unidirectional conducting device is the diode in this embodiment, and the electrostatic discharge device also is the diode, connects when reverse at chip power VCC and ground wire, when chip power VCC adds reverse normal operating voltage to the ground wire promptly, and diode D1 ends to be in the off-state between ground wire and the chip power VCC, diode D3 and diode D1 all can not damaged.
The sixth embodiment of the present invention, as shown in fig. 7: the circuit comprises a resistor R1, a transistor Q1 and a transistor Q2. The signal line VDD is a power supply signal line of a chip internal function module, one end of the resistor R1 is connected with the signal line VDD, the other end of the resistor R1 is connected with the chip power supply VCC, the emitter and the base of the triode Q1 are both connected with the chip power supply VCC, the collector of the triode Q1 is connected with the signal line A, the collector of the triode Q2 is connected with the signal line A, and the emitter and the base of the triode Q2 are both connected with the ground wire.
The utility model discloses a sixth embodiment combines fig. 7, and the unidirectional conducting device is the triode in this embodiment, and the electrostatic discharge device also is the triode, connects when reverse at chip power VCC and ground wire, when chip power VCC adds reverse normal operating voltage to the ground wire promptly, triode Q2 ends to be in the off-state between ground wire and the chip power VCC, triode Q1 and triode Q2 all can not damaged.
The seventh embodiment of the present invention, as shown in fig. 8: the circuit comprises a resistor R1, a diode D1 and a diode D3. The signal line VDD is a power supply signal line of a functional module inside the chip, one end of the resistor R1 is connected with the signal line VDD, the other end of the resistor R1 is connected with the chip power VCC, the cathode of the diode D1 is connected with the chip power VCC, the anode of the diode D1 is connected with the signal line A, the anode of the diode D3 is connected with the signal line A, and the cathode of the diode D3 is connected with the ground wire.
The utility model discloses a seventh embodiment combines fig. 8, and the unidirectional conducting device is the diode in this embodiment, and the electrostatic discharge device also is the diode, connects when reverse at chip power VCC and ground wire, when chip power VCC adds reverse normal operating voltage to the ground wire promptly, and diode D3 ends to be in the off-state between ground wire and the chip power VCC, diode D3 and diode D1 all can not damaged.
The resistor R1 in the above embodiment has two functions: one effect is that resistance R1 can carry out the current-limiting to the inside function module of chip when buzzer driver chip power VCC connects reverse with the ground wire to prevent that the inside function module of chip from being damaged because of the electric current is too big, and another effect is when electrostatic protection, resistance R1 can carry out the current-limiting to the inside function module of chip, makes static mainly discharge through one-way conductive device and electrostatic discharge device, thereby improves the electrostatic protection ability of the inside function module of chip.
In summary, the positions of the unidirectional conductive device and the electrostatic discharge device can be exchanged, so long as the unidirectional conductive device and the electrostatic discharge device are ensured to be in a cut-off state under the condition that reverse normal operating voltage is applied from the chip power supply VCC to the signal line a and from the signal line a to the ground wire, at least one of the unidirectional conductive device and the electrostatic discharge device is in a cut-off state, the effect of actual use is not affected, so that when the chip power supply VCC and the ground wire are connected reversely, namely when the chip power supply VCC is applied to the ground wire and the reverse normal operating voltage is applied to the ground wire, one of the unidirectional conductive device and the electrostatic discharge device is in a cut-off state, and the unidirectional conductive device and the electrostatic discharge device are not damaged. The fourth embodiment of the present invention can be regarded as a result of the exchange of the positions of the unidirectional conductive device and the electrostatic discharge device.
The above description is only an example of the present invention, and is not intended to limit the present invention, and those skilled in the art can make various modifications and variations. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (5)
1. The utility model provides an electrostatic protection circuit for bee calling organ drive chip power, a serial communication port, including resistance R1, one-way conductive device, electrostatic discharge device, wherein, signal line VDD is the power supply signal line of the inside function module of chip, resistance R1 one end is connected signal line VDD, chip power VCC is connected to the resistance R1 other end, chip power VCC is connected to one-way conductive device one end, signal line A is connected to the one-way conductive device other end, signal line A is connected to electrostatic discharge device one end, the ground wire is connected to the electrostatic discharge device other end.
2. The electrostatic protection circuit for a buzzer driving chip power supply according to claim 1, wherein at least one of said unidirectional conducting device and said electrostatic discharge device is in an off state under a condition that a reverse normal operating voltage is applied from a chip power supply VCC to a signal line a and from the signal line a to a ground.
3. The electrostatic protection circuit for a buzzer driving chip power supply according to claim 1, wherein said unidirectional conducting device refers to three devices: diode, triode, MOS pipe.
4. The esd circuit for a buzzer driver chip power supply of claim 1, wherein the esd device is a commonly used esd device, commonly used esd device includes: diode, triode, MOS pipe, silicon controlled rectifier.
5. The electrostatic protection circuit for the power supply of the buzzer driving chip as claimed in claim 1, wherein the connection relationship between the unidirectional conducting device and the electrostatic discharge device is as follows: one end of the electrostatic discharge device is connected with a chip power supply VCC, the other end of the electrostatic discharge device is connected with a signal line A, one end of the one-way conductive device is connected with the signal line A, and the other end of the one-way conductive device is connected with a ground wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120538932.7U CN214543622U (en) | 2021-03-17 | 2021-03-17 | Electrostatic protection circuit for buzzer driving chip power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120538932.7U CN214543622U (en) | 2021-03-17 | 2021-03-17 | Electrostatic protection circuit for buzzer driving chip power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214543622U true CN214543622U (en) | 2021-10-29 |
Family
ID=78262951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120538932.7U Active CN214543622U (en) | 2021-03-17 | 2021-03-17 | Electrostatic protection circuit for buzzer driving chip power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214543622U (en) |
-
2021
- 2021-03-17 CN CN202120538932.7U patent/CN214543622U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111934304B (en) | Protection circuit and protection method for preventing hot plug voltage surge | |
| JP2001244418A (en) | Semiconductor integrated circuit device | |
| CN201947216U (en) | Drive integrated circuit of a DC motor of a toy lock set | |
| CN201860305U (en) | Overvoltage protection circuit for USB (universal serial bus) analogue switch under power up and power down conditions | |
| CN112993964A (en) | Electrostatic protection circuit for buzzer driving chip power supply | |
| CN115882580A (en) | Power supply switching system and dual-power supply equipment | |
| CN214543622U (en) | Electrostatic protection circuit for buzzer driving chip power supply | |
| CN110311667B (en) | Port circuit with port voltage protection circuit | |
| CN215934520U (en) | Power supply switching system and dual-power supply equipment | |
| CN103325523A (en) | Electromagnet protection circuit | |
| CN202977969U (en) | Efficient protection circuit of laser coupling power source | |
| CN112865056A (en) | Electrostatic protection circuit based on buzzer driving chip power supply | |
| CN107910849B (en) | Overvoltage, reverse connection and power failure protection circuit | |
| CN206602111U (en) | For the reversed flow restriction without internal source of stable pressure integrated circuit | |
| CN110311668A (en) | A kind of chip output pin forward direction over-voltage and reverse voltage protection circuit and method | |
| CN210669880U (en) | Circuit for increasing drive current of integrated chip | |
| CN110601512A (en) | Discrete high-side driving circuit system | |
| CN217216529U (en) | Output control circuit and operation equipment | |
| CN217824247U (en) | Power supply reverse connection protection circuit of full-bridge output structure | |
| JP3941619B2 (en) | Electrostatic protection circuit and semiconductor integrated circuit | |
| CN217240326U (en) | Anti-reverse connection circuit, electronic equipment and vehicle | |
| CN209785543U (en) | Driving circuit for preventing reverse burning of power supply and ground connection of buzzer with low starting voltage | |
| CN218383711U (en) | Connecting circuit | |
| CN213461124U (en) | Power supply temperature protection circuit | |
| CN109712601A (en) | The reversed driving circuit burnt of power supply and ground is prevented for buzzer low start voltage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |