CN112993964A - Electrostatic protection circuit for buzzer driving chip power supply - Google Patents
Electrostatic protection circuit for buzzer driving chip power supply Download PDFInfo
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- CN112993964A CN112993964A CN202110278764.7A CN202110278764A CN112993964A CN 112993964 A CN112993964 A CN 112993964A CN 202110278764 A CN202110278764 A CN 202110278764A CN 112993964 A CN112993964 A CN 112993964A
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- power supply
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- electrostatic discharge
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/003—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electrostatic apparatus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/008—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for protective arrangements according to this subclass
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Semiconductor Integrated Circuits (AREA)
Abstract
The invention provides an electrostatic protection circuit for a buzzer driving chip power supply, which comprises a resistor R1, a one-way conductive device 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, 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 invention relates to the field of buzzer circuits, in particular to an electrostatic protection circuit for a buzzer driving chip power supply and a buzzer driving chip.
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.
Disclosure of Invention
The invention provides an electrostatic protection circuit for a buzzer driving chip power supply, which aims to solve the problem that when a power line of a buzzer driving chip is reversely connected with a ground wire, a chip electrostatic discharge device and a chip internal functional module are easily damaged, and further improve the electrostatic protection capability of the chip internal functional module.
In order to solve the above technical problem, the present invention provides an electrostatic protection circuit for a power supply of a buzzer driving chip, as shown in fig. 1, including a resistor R1, a unidirectional conductive device, 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, 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 according to 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 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 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 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 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 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 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 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 more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the electrostatic protection circuit for the power supply of the buzzer driving chip provided by the invention comprises a resistor R1, a unidirectional conductive device 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, 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 first embodiment of the present invention is combined with fig. 2, in this embodiment, the unidirectional conductive device is a diode, and when the chip power VCC and the ground are reversely connected, that is, when the chip power VCC is applied with a reverse normal operating voltage to the ground, the diode D1 is cut off, so that the ground and the chip power VCC are in a cut-off state, and the chip electrostatic discharge device and the diode D1 are not damaged.
A second embodiment of the 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.
In the second embodiment of the present invention, with reference to fig. 3, in this embodiment, the unidirectional conductive device is a diode-connected NPN transistor, and when the chip power VCC and the ground line are connected in reverse, that is, when the chip power VCC is applied with a reverse normal operating voltage to the ground line, the NPN transistor Q1 is turned off, so that the ground line and the chip power VCC are in a cut-off state, and the chip electrostatic discharge device and the NPN transistor Q1 are not damaged.
A third embodiment of the present invention, as 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.
In the third embodiment of the present invention, referring to fig. 4, the unidirectional conductive device in this embodiment is a diode, the electrostatic discharge device is an NMOS transistor N1, and when the chip power VCC and the ground are connected in reverse, that is, when the chip power VCC is applied with a reverse normal operating voltage to the ground, the diode D1 is cut off, so that the ground and the chip power VCC are in a cut-off state, and neither the NMOS transistor N1 nor the diode D1 is damaged.
The fourth embodiment of the present invention, as 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.
In the fourth embodiment of the present invention, with reference to fig. 5, the unidirectional conductive device in this embodiment is an NMOS transistor, and the electrostatic discharge device is a diode, when the chip power VCC and the ground are connected in reverse, that is, when the chip power VCC is applied with a reverse normal operating voltage to the ground, the diode D1 is cut off, so that the ground and the chip power VCC are in a cut-off state, and neither the NMOS transistor N1 nor the diode D1 is damaged.
The fifth embodiment of the present invention, as 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.
A fifth embodiment of the present invention is shown in fig. 6, in which the unidirectional conductive device is a diode, the electrostatic discharge device is also a diode, and when the chip power VCC and the ground are connected in reverse, that is, when the chip power VCC is applied with a reverse normal operating voltage to the ground, the diode D1 is cut off, so that the ground and the chip power VCC are in a cut-off state, and neither the diode D3 nor the diode D1 is damaged.
A 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.
In the sixth embodiment of the present invention, with reference to fig. 7, the unidirectional conductive device is a triode, the electrostatic discharge device is also a triode, and when the chip power VCC and the ground are connected in reverse, that is, when the chip power VCC is applied with a reverse normal operating voltage to the ground, the triode Q2 is cut off, so that the ground and the chip power VCC are in a cut-off state, and neither the triode Q1 nor the triode Q2 is 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.
A seventh embodiment of the present invention is shown in fig. 8, in which the unidirectional conductive device is a diode, the electrostatic discharge device is also a diode, and when the chip power VCC and the ground are connected in reverse, that is, when the chip power VCC is applied with a reverse normal operating voltage to the ground, the diode D3 is cut off, so that the ground and the chip power VCC are in a cut-off state, and neither the diode D3 nor the diode D1 is 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. The fourth embodiment of the present invention can be considered as a result of the exchange of the positions of the unidirectional conducting device and the electrostatic discharging device.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. 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 electrostatic protection circuit for the buzzer driving chip power supply is characterized by comprising a resistor R1, a one-way conductive device 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, 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.
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 |
|---|---|---|---|
| CN202110278764.7A CN112993964A (en) | 2021-03-17 | 2021-03-17 | Electrostatic protection circuit for buzzer driving chip power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110278764.7A CN112993964A (en) | 2021-03-17 | 2021-03-17 | Electrostatic protection circuit for buzzer driving chip power supply |
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| CN112993964A true CN112993964A (en) | 2021-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110278764.7A Pending CN112993964A (en) | 2021-03-17 | 2021-03-17 | Electrostatic protection circuit for buzzer driving chip power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114421445A (en) * | 2021-09-06 | 2022-04-29 | 上海芯圣电子股份有限公司 | Chip for preventing reverse connection of power supply |
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2021
- 2021-03-17 CN CN202110278764.7A patent/CN112993964A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114421445A (en) * | 2021-09-06 | 2022-04-29 | 上海芯圣电子股份有限公司 | Chip for preventing reverse connection of power supply |
| CN114421445B (en) * | 2021-09-06 | 2024-02-23 | 上海芯圣电子股份有限公司 | Chip capable of preventing reverse connection of power supply |
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