CN109149540A - A kind of esd protection circuit and electronic equipment - Google Patents
A kind of esd protection circuit and electronic equipment Download PDFInfo
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- CN109149540A CN109149540A CN201810995610.8A CN201810995610A CN109149540A CN 109149540 A CN109149540 A CN 109149540A CN 201810995610 A CN201810995610 A CN 201810995610A CN 109149540 A CN109149540 A CN 109149540A
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- esd
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- 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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- Semiconductor Integrated Circuits (AREA)
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Abstract
It includes: input terminal, ground terminal, ESD protective device, Subloop Protect circuit and output end that the embodiment of the present invention, which provides a kind of esd protection circuit and electronic equipment, the circuit, wherein the input terminal, for when an esd event occurs, receiving ESD current signal；The ESD protective device is connect with the input terminal and the ground terminal respectively, and for providing discharge path to the ESD current signal, the ESD current signal is directed at the ground terminal from the input terminal；The Subloop Protect circuit, it is in parallel with the ESD protective device, for inhibiting the ESD current signal；The output end, and the Subloop Protect circuit connection, for by protection circuit connection.In this way, can carry out ESD protection by ESD protective device and Subloop Protect circuit to by protection circuit, reduce influence of the ESD to electronic component in circuit.
Description
Technical field
The present embodiments relate to electronics field more particularly to a kind of esd protection circuits and electronic equipment.
Background technique
With the continuous development of Internet technology and smart home, the electronics such as intelligent sound box, wearable device, wireless headset
Equipment has become the necessity in people's daily life, allows people that can enjoy development in science and technology bring convenient.
In practical applications, electrostatic is ubiquitous in daily life, for example, human body walks dyanainic friction, on the person on the ground
The mutual friction of clothing phase, human body is contacted with the object of static electrification lotus, human body is in electrostatic field when electrification by induction to exist
Electrostatic is accumulated on human body, when this person touches electronic equipment, it may occur that static discharge (Electro-Static discharge,
ESD) process forms the instantaneous discharge for reaching several amperes of high voltage, strong electrical field, wideband within the time for being short to several hundred microseconds
Current signal.The current signal can electricity on the PCB (Printed Circuit Board, printed circuit board) to electronic equipment
Sub- component is interfered, or even the consequence of meeting causing damage property of electron component, so that electronic component failure or mistake
Movement, causes electronic equipment can not work normally, occurs bluetooth disconnection for example, static discharge will lead to wireless headset product, broadcasts
The problems such as stopping, the audio output of putting the music on be noiseless, earphone fever.
Therefore, the problem of urgent need to resolve ESD interferes even damage to the electronic component of circuit.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of esd protection circuit and electronic equipment, main purpose are to pass through
ESD protective device and Subloop Protect circuit are realized and carry out ESD protection to by protection circuit, can be avoided ESD to electronics in circuit
Component, which is interfered, damaged etc., to be influenced.
In order to achieve the above objectives, the embodiment of the present invention mainly provides the following technical solutions:
In a first aspect, the embodiment of the present invention provides a kind of esd protection circuit, the circuit include: input terminal, ground terminal,
ESD protective device, Subloop Protect circuit and output end, wherein the input terminal, for when an esd event occurs, receiving
ESD current signal；The ESD protective device is connect with the input terminal and the ground terminal respectively, for the ESD electricity
It flows signal and discharge path is provided, the ESD current signal is directed at the ground terminal from the input terminal；The Subloop Protect electricity
Road, it is in parallel with the ESD protective device, for inhibiting the ESD current signal；The output end, with the Subloop Protect electricity
Road connection, for by protection circuit connection.
In embodiments of the present invention, the Subloop Protect circuit includes: impedor and capacitor, wherein the impedance
Element includes: the first impedor and the second impedor, wherein the first end of first impedor and the input terminal
Connection, the second end of first impedor are connect with the first end of the capacitor；The first of second impedor
End is connect with the ground terminal, and the second end of second impedor is connect with the second end of the capacitor；The output
End is formed by the first end of the capacitor and the second end of the capacitor.
In embodiments of the present invention, the first end of the capacitor is used to connect with the power end by protection circuit,
The second end of the capacitor with the ground terminal by protection circuit for connecting.
In embodiments of the present invention, the impedor is one of magnetic bead, inductance and resistance or multiple combinations.
In embodiments of the present invention, when the impedor is magnetic bead, the impedance value of the magnetic bead is more than or equal to
120Ω。
In embodiments of the present invention, the capacitance of the capacitor is more than or equal to 1 μ F.
In embodiments of the present invention, the ESD protective device is ESD protection diode, transient voltage suppressor diode, pressure
One of quick resistance and gas-discharge tube.
Second aspect, the embodiment of the present invention provide a kind of electronic equipment, and the electronic equipment includes: shell, printed circuit
Plate PCB, circuit system and above-mentioned esd protection circuit, wherein the shell offers the first opening and the second opening, and described
The setting position of one opening is corresponding with the setting position of the input terminal, the setting position of second opening and the ground terminal
Setting position it is corresponding；The PCB is set in the shell, and the circuit system is provided on the PCB and the ESD is protected
Protection circuit；The circuit system is connect with the output end of the esd protection circuit.
In embodiments of the present invention, the input terminal and the ground terminal are formed by metal contact element respectively, the metal
One end of contact is set on the PCB, and the other end of the metal contact element is for the output end in contact with external power supply
Connection.
In embodiments of the present invention, the electronic equipment is wireless headset, and the other end of the metal contact element is described in
The distance of the outer surface of shell is 2 millimeters.
Esd protection circuit and electronic equipment provided in an embodiment of the present invention, the esd protection circuit include input terminal, ground connection
End, ESD protective device, Subloop Protect circuit and output end, wherein input terminal, for when an esd event occurs, receiving ESD
The current signal of generation；ESD protective device is connect with input terminal and ground terminal respectively, for providing electric discharge to ESD current signal
ESD current signal is directed at ground terminal from input terminal by access；Subloop Protect circuit, it is in parallel with ESD protective device, for inhibiting
ESD current signal；Output end, and Subloop Protect circuit connection, for by protection circuit connection.In this way, passing through ESD protector
Part and Subloop Protect circuit carry out ESD protection to by protection circuit to realize, on the one hand, when ESD protective device is connected, Neng Gouti
For the discharge path of the ESD current signal by input terminal to ground terminal, realization will be put into the ESD current signal of input terminal one
Divide and be put into ground terminal, on the other hand, another part in ESD current signal is inhibited by Subloop Protect circuit, avoids ESD
Current signal enters subsequent by protection circuit.To realize dual ESD protection, improve by the ESD protection of protection circuit
Ability, can be when occurring electrostatic discharge event, and avoiding static discharge current from entering in protection circuit, is prevented static discharge electric
Flow to by protection circuit electronic component and chip interfering and damage.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is a kind of structural schematic diagram of the esd protection circuit in the embodiment of the present invention；
Fig. 2 is another structural schematic diagram of the esd protection circuit in the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the electronic equipment in the embodiment of the present invention.
Specific embodiment
The exemplary embodiment that the present invention will be described in more detail below with reference to accompanying drawings.Although showing the present invention in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the present invention without should be by embodiments set forth here
It is limited.It is to be able to thoroughly understand the present invention on the contrary, providing these embodiments, and can be by the scope of the present invention
It is fully disclosed to those skilled in the art.
The embodiment of the present invention provides a kind of esd protection circuit, which can be used for various need to electronics member
Device or circuit carry out in the occasion of ESD protection, and specifically, which can be set in the electronic device, use
In circuit system, the core circuit etc. of protecting the electronic equipment.
In practical applications, which can implement in a variety of manners.For example, described in the embodiment of the present invention
Electronic equipment may include the smart home devices such as intelligent sound box, Intelligent set top box, also may include such as wireless headset,
Carry-on equipment such as smart phone, tablet computer, smartwatch, Intelligent bracelet etc..It is, of course, also possible to be mentioned for other types of needs
The electronic equipment of high ESD protection performance, such as laptop.Here, specific implementation of the embodiment of the present invention to electronic equipment
Form is not specifically limited.
Fig. 1 is a kind of structural schematic diagram of the esd protection circuit in the embodiment of the present invention, shown in Figure 1, which protects
Protection circuit 10 may include: input terminal 11, ground terminal 12, ESD protective device 13, Subloop Protect circuit 14 and output end 15；
Wherein, input terminal 11, for when an esd event occurs, receiving ESD current signal；ESD protective device 13, respectively
It is connect with input terminal 11 and ground terminal 12, for giving ESD current signal to provide discharge path, by ESD current signal from input terminal
11 are directed at ground terminal 12；Subloop Protect circuit 14, it is in parallel with ESD protective device 13, for inhibiting ESD current signal；Output end
15, it is connect with Subloop Protect circuit 14, for being connect with by protection circuit 16.
Here, the electronics member device for needing the circuit for carrying out ESD protection or needing to carry out ESD protection is referred to by protection circuit
Circuit where part may include one or more electronic components for needing to carry out ESD protection.In practical applications, as general
When the ESD circuit is set in electronic equipment, this can be the circuit system of the electronic equipment, core circuit etc. by protection circuit
Internal circuit.When the ESD circuit to be set on circuit board, this can be other electricity on the circuit board by protection circuit
Road, such as functional circuit etc..
In practical applications, ESD protective device can be ESD protection diode, such as ESD5E150TA, or transient state
Voltage inhibits (TVS, Transient Voltage Suppressor) diode, such as two-way TVS diode, can also be for such as
Glass gas-discharge pipe (can also be referred to as SPG), ceramic gas discharge tube (or being referred to as GDT), semiconducting solid are put
The discharge tubes such as fulgurite (TSS, Thyristor Surge Suppressors), it is, of course, also possible to be other types of circuit protection
Device, for example, varistor (MOV, Metal Oxide Varistor), self-recovery fuse (PPTC, Polymer
Positive Temperature Coefficient) etc., alternatively, can also be the combination of above-mentioned a variety of protection devices.Having
, can be by those skilled in the art according to actual needs come sets itself in body implementation process, here, the embodiment of the present invention is to ESD
The type of protection device is not specifically limited.
Below for being used to the esd protection circuit protect by protection circuit, the ESD in the embodiment of the present invention is protected
The course of work of circuit is illustrated.
Specifically, it is assumed that the human body with electrostatic is in contact with the electronic equipment, and esd event has occurred, several being short to
In the time of hundred microseconds, the transient high-current for reaching several amperes of high voltage, strong electrical field, wideband can be formed on an electronic device,
That is ESD current signal, at this point, the input terminal in esd protection circuit will receive ESD current signal.
Next, ESD current signal will flow in esd protection circuit after input terminal receives ESD current signal
It is dynamic.It since Subloop Protect circuit is in parallel with ESD protective device, is connect in esd protection circuit in esd protection circuit
Input terminal and ground terminal between, then, ESD current signal in esd protection circuit can bifurcated, in this way, ESD current signal
In a part can branch to the branch (input terminal-> ESD protective device-> output end) where ESD protective device, ESD electricity
Another part in stream signal can branch to the branch (input terminal-> Subloop Protect circuit-> output where Subloop Protect circuit
End).To which subsequent circuit can be protected by the two branches, so that the electronic component in subsequent circuit will not
Impact by ESD current signal.
Next, since ESD current signal is a transient high-current, under the action of the ESD current signal, the ESD
Protection device can be connected.So, when ESD protective device is connected, it is logical that the branch where ESD protective device just will form electric discharge
Road, by the discharge path, the major part in ESD current signal can flow to ground connection from input terminal by ESD protective device
End, is directed at ground terminal for the ESD current signal for being put into input terminal in this way, realizing, can be to avoid one of the ESD current signal
Divide and enter by protection circuit, to play the role of the subsequent circuit of protection, so that subsequent circuit element is not by high voltage transient
The impact of spike.
Finally, due to which Subloop Protect circuit is able to suppress ESD current signal, do not led in this way, being in the ESD protective device
When logical state or the ESD protective device in the conductive state, branch to another in the ESD current signal of Subloop Protect circuit
Portion of electrical current signal can be inhibited to decay, inhibit ESD current signal in this way, realizing, can further keep away by Subloop Protect circuit
The another part exempted from the ESD current signal enters by protection circuit, to further function as the effect for protecting subsequent circuit.
As shown in the above, esd protection circuit provided by the embodiment of the present invention, comprising: input terminal, ground terminal, ESD
Protect device, Subloop Protect circuit and output end, wherein input terminal, for when an esd event occurs, receiving what ESD was generated
Current signal；ESD protective device is connect with input terminal and ground terminal respectively, for providing discharge path to ESD current signal,
ESD current signal is exported from input terminal to ground terminal；Subloop Protect circuit, it is in parallel with ESD protective device, for inhibiting ESD
Current signal；Output end, and Subloop Protect circuit connection, for by protection circuit connection.In this way, passing through ESD protective device
Realize that ESD is protected with Subloop Protect circuit, on the one hand, when ESD protective device is connected, be capable of providing by input terminal to ground terminal
ESD current signal discharge path, realization will be put into a part in the ESD current signal of input terminal and be put into ground terminal, another
Aspect inhibits another part in ESD current signal by Subloop Protect circuit, and ESD current signal is avoided to enter below
By protection circuit.To realize dual ESD protection, improve by the ESD protection capability of protection circuit, can occur
When electrostatic discharge event, avoids static discharge current from entering by protection circuit, prevent static discharge current to by protection circuit
In electronic component and chip interfering and damage.
Based on previous embodiment, the embodiment of the present invention also provides another esd protection circuit, and Fig. 2 is the embodiment of the present invention
In esd protection circuit another structural schematic diagram, shown in Figure 2, which may include: impedance element
Part and capacitor 142；
Wherein, impedor may include: the first impedor 141a and the second impedor 141b, wherein the first resistance
The first end of anti-element 141a is connect with input terminal 11, the second end of the first impedor 141a and the first end of capacitor 142
Connection；The first end of second impedor 141b is connect with ground terminal 12, the second end and capacitor of the second impedor 141b
142 second end connection；Output end 15 is formed by the first end of capacitor 142 and the second end of capacitor 142.
Here, the first impedor and the second impedor are capable of providing impedance, ESD current signal are consumed, for reducing
ESD current signal；Capacitor can store the energy of ESD current signal, and reduce esd discharge crest voltage.
In the specific implementation process, above-mentioned impedor can be magnetic bead, or inductance, it is, of course, also possible to be it
The combination that it is capable of providing the electronic component (such as resistance) or above-mentioned electronic component of impedance is (combination of such as inductance and resistance, more
The combination of a magnetic bead, combination of multiple inductance etc.).Can be by those skilled in the art's sets itself according to the actual situation, here, this
Inventive embodiments are not specifically limited.
In practical applications, when impedor by magnetic bead to realize when, the first impedor can be by one or more magnetic
Pearl realizes that similarly, the second impedor can be realized by one or more magnetic beads.Illustratively, when impedor is by magnetic
Pearl is come when realizing, the first impedor and the second impedor can be realized by a magnetic bead, alternatively, the first impedor
It can be realized by a magnetic bead, the second impedor can be realized by two magnetic bead series connection.
In practical applications, in order to reach preferably ESD protection effect, when the first impedor and the second impedor are equal
It when realizing, can choose the magnetic bead that impedance value is more than or equal to 120 Ω by a magnetic bead.
Illustratively, when the input terminal in esd protection circuit is also used to connect with the positive terminal of external power supply, ESD is protected
When ground terminal in circuit is also used to connect with the negative pole end of external power supply, in order to can be realized ESD protection in ESD,
And in normal work (for example, external power supply is powered by protection circuit), it can be avoided reduction and enter by protection circuit
Normal current current value, above-mentioned impedor can choose using magnetic bead.
In practical applications, in order to reach preferably ESD protection effect, the capacitance of capacitor is more than or equal to 1 μ F
(microfarad).
In an alternative embodiment of the invention, in order to preferably carry out ESD protection to by protection circuit, referring still to Fig. 2 institute
Show, for connecting with by the power end 16a of protection circuit, the second end of capacitor 142 is used for and quilt the first end of capacitor 142
Protect the ground terminal 16b connection of circuit.
Below referring still to shown in Fig. 2, the first impedor 141a, the second impedor are included with Subloop Protect circuit 14
For 141b and capacitor 142, the first impedor 141a and the second impedor 141b are magnetic bead, above-mentioned ESD is protected
The course of work of circuit is illustrated.
Specifically, when an esd event occurs, input terminal 11 can receive ESD current signal, then, ESD current signal
It will be flowed in esd protection circuit.In esd protection circuit, since Subloop Protect circuit 14 and ESD protective device 13 are simultaneously
Connection, be all connect between the input terminal 11 and ground terminal 12 of esd protection circuit, then, ESD in esd protection circuit electricity
Signal i meeting bifurcated is flowed, ESD current signal i1 and ESD current signal i2 is formed.
Next, mainly bleed off the ESD current signal that input terminal receives by following three current paths, to realize pair
ESD protection is carried out by protection circuit.
Wherein, current path A are as follows: input terminal 11-> ESD protective device 13-> output end 12；Current path B are as follows: input
End 11-> ESD protective device 13-> the second impedor 141b-> by the ground terminal 16b of protection circuit；Current path C are as follows:
Input terminal 11-> the first impedor 141a-> capacitor 142-> by the ground terminal 16b of protection circuit.
First, ESD current signal i1 can flow to branch (current path A and current path where ESD protective device 13
B), here, since ESD current signal is a transient high-current, under the action of the ESD current signal, the ESD protective device
13 can be connected, and the branch where ESD protective device 13 just will form discharge path, in this way, when being connected by ESD protective device 13
For the discharge path that ESD current signal i1 is provided, electrostatic can be bled off, can enter and be protected to avoid ESD current signal i1
In circuit.
Specifically, ESD current signal i1 flow through after ESD protective device 13 can bifurcated, formed ESD current signal i11 and
ESD current signal i12, ESD current signal i11 flow to output end 12 by current path A, and ESD current signal i12 flow to second
Impedor 141b is distributed in high frequency (30~200MHz) since the energy of ESD current signal i12 has significant portion here,
And the second impedor 141b is magnetic bead, and relatively high impedance can be provided in high frequency, can be absorbed in ESD current signal i12
High-frequency signal, to reduce ESD current signal, then, the low frequency signal in remaining ESD current signal i12, which can be flow to, to be protected
The ground terminal 16b of protection circuit.This way it is possible to avoid a part of the ESD current signal enters by protection circuit, to play guarantor
The effect of subsequent circuit is protected, so that subsequent circuit element is not by the impact of high voltage transient spike.
Second, ESD current signal i2 can flow to the branch (current path C) where the first impedor 141a, similarly, this
In, it is distributed in high frequency (30~200MHz) since the energy of ESD current signal i2 has significant portion, and the first impedor
141a is magnetic bead, and relatively high impedance can be provided in high frequency, the high-frequency signal in ESD current signal i2 can be absorbed, to subtract
Small ESD current signal, then, the low frequency signal in remaining ESD current signal i2 can flow to capacitor 142, capacitor 142 into
One step can get up the energy stores of ESD current signal i2, and can reduce ESD crest voltage.This way it is possible to avoid should
Another part of ESD current signal enters by protection circuit, to play the role of the subsequent circuit of protection, so that subsequent electricity
Circuit component is not by the impact of high voltage transient spike.
As shown in the above, esd protection circuit provided by the embodiment of the present invention passes through ESD protective device, the first resistance
The effect of anti-element, capacitor and the second impedor realizes ESD current signal received on input terminal being directed at ground connection
End, and inhibit ESD current signal, it can enter to avoid the ESD current signal by protection circuit, thus, it is subsequent to play protection
The effect of circuit.
Based on the same inventive concept, as the application to above-mentioned esd protection circuit, the embodiment of the present invention also provides a kind of electricity
Sub- equipment, the esd protection circuit being provided in the electronic equipment in said one or multiple embodiments, to realize that protection electronics is set
Standby internal circuit, such as circuit system improve the ESD protection capability of electronic equipment.To be easy to read, electronic equipment of the present invention is real
It applies example no longer to repeat the detail content in aforementioned esd protection circuit embodiment one by one, it should be understood that in the present embodiment
Electronic equipment can correspond to realize previous embodiment in full content.For not disclosed in electronic equipment embodiment of the present invention
Technical detail, please refer to the description of esd protection circuit embodiment of the present invention and understand.
Fig. 3 is the structural schematic diagram of the electronic equipment in the embodiment of the present invention, shown in Figure 3, which can be with
It include: the esd protection circuit in shell 31, printing board PCB, circuit system and such as above-mentioned one or more embodiments；Its
In, shell 31 offers the first opening 32 and the second opening 33, the setting position of the setting position and input terminal 11 of the first opening 32
Correspondence is set, the setting position of the second opening 33 is corresponding with the setting position of ground terminal 12；Above-mentioned PCB is set in shell 31, on
It states and is provided with circuit system and esd protection circuit on PCB；The connection of the output end of circuit system and esd protection circuit.
Here, esd protection circuit is to carry out ESD protection for the circuit system to electronic equipment.
Specifically, when the human body with electrostatic is contacted with electronic equipment, it may occur that esd event forms instantaneous ESD electricity
Signal is flowed, which can enter electronic equipment internal by the input terminal that the first opening is arranged, protect by ESD
Protection circuit carries out ESD protection to the circuit system of electronic equipment, and static discharge is avoided to cause the electronic component of electronic equipment
Interference or damage.
In practical applications, above-mentioned the first opening and the second opening can be the charge port of electronic equipment.
In other embodiments of the present invention, above-mentioned input terminal and ground terminal can use but not limit to following manner to come in fact
It is existing.Specifically, input terminal and ground terminal are formed by metal contact element respectively, and one end of metal contact element is set on PCB, gold
The other end for belonging to contact is used to connect with the output end of external power supply.
Here, above-mentioned metal contact element is made of the conductive metallic materials such as copper, aluminium, silver.
Illustratively, the cathode output end of the metal contact element and external power supply that form input terminal connects, and formation connects
The metal contact element of ground terminal and the cathode output end of external power supply connect.In this manner it is possible to pass through external power supply electron
Equipment power supply, for example, the battery in the circuit system of electron equipment charges.
In practical applications, above-mentioned metal contact element can be elastic slice, or Z-shaped sheet metal and metal column composition
Contact, it is, of course, also possible to be capable of conductive contact for other forms.Accordingly, the output end of said external power supply
It can be realized by spring thimble such as Pogo Pin.
In practical applications, which can implement in a variety of manners.For example, described in the embodiment of the present invention
Electronic equipment may include the smart home devices such as intelligent sound box, Intelligent set top box, also may include such as wireless headset,
Carry-on equipment such as smart phone, tablet computer, smartwatch, Intelligent bracelet etc..It is, of course, also possible to be mentioned for other types of needs
The electronic equipment of high ESD protection performance, such as laptop.Here, specific implementation of the embodiment of the present invention to electronic equipment
Form is not specifically limited.
In an alternative embodiment of the invention, when above-mentioned electronic equipment is realized by wireless headset, in order to further increase electricity
The distance of the ESD protection capability of sub- equipment, the other end to the housing outer surface of metal contact element is 2 millimeters.
In this way, since the distance of the other end to the housing outer surface of metal contact element is 2 millimeters, and the first opening and second
Opening forms the charge port of wireless headset, and the contact jaw of the metal contact element in charge port and shell can be made to occur 2 millimeters
Indent, then, when esd event occurs, compared with not doing indent, discharge path is able to extend, so that ESD current signal
Energy is weakened.To, it will be able to further avoid wireless headset from bringing ESD to destroy by user human contact.
Although in addition, charge port exist due to charge contact can be elastic slice thimble contact, charge port indent not
It will affect charge function.
As shown in the above, in embodiments of the present invention, esd protection circuit is applied in electronic equipment, ESD is protected
The output end of protection circuit and the circuit system of electronic equipment connect, in this way, esd event can occur by esd protection circuit
When, ESD protection is carried out to internal circuits such as the circuit systems of electronic equipment, thus, improve the anti-ESD of circuit in electronic equipment
Ability, so that electronic equipment has preferably electrostatic protection effect.
The foregoing is only a preferred embodiment of the present invention, is not used to make the present invention limit in any form
System.To those skilled in the art, the invention may be variously modified and varied.It is all spirit and principles of the present invention it
Interior any modification, equivalent replacement, improvement and so on, should be included within scope of the presently claimed invention.
Claims (10)
1. a kind of static discharge ESD protective circuit, which is characterized in that the circuit includes: input terminal, ground terminal, ESD protector
Part, Subloop Protect circuit and output end, wherein
The input terminal, for when an esd event occurs, receiving ESD current signal；
The ESD protective device is connect with the input terminal and the ground terminal respectively, for mentioning to the ESD current signal
For discharge path, the ESD current signal is directed at the ground terminal from the input terminal；
The Subloop Protect circuit, it is in parallel with the ESD protective device, for inhibiting the ESD current signal；
The output end, and the Subloop Protect circuit connection, for by protection circuit connection.
2. circuit according to claim 1, which is characterized in that the Subloop Protect circuit includes: impedor and capacitor
Device, wherein
The impedor includes: the first impedor and the second impedor, wherein the first end of first impedor
It is connect with the input terminal, the second end of first impedor is connect with the first end of the capacitor；Second resistance
The first end of anti-element is connect with the ground terminal, and the second end of second impedor and the second end of the capacitor connect
It connects；
The output end is formed by the first end of the capacitor and the second end of the capacitor.
3. circuit according to claim 2, which is characterized in that the first end of the capacitor is used for described by protection electricity
The power end on road connects, and the second end of the capacitor with the ground terminal by protection circuit for connecting.
4. circuit according to claim 2, which is characterized in that the impedor is one in magnetic bead, inductance and resistance
Kind or multiple combinations.
5. circuit according to claim 2, which is characterized in that when the impedor is magnetic bead, the resistance of the magnetic bead
Anti- value is more than or equal to 120 Ω.
6. circuit according to claim 2, which is characterized in that the capacitance of the capacitor is more than or equal to 1 μ F.
7. circuit according to claim 1, which is characterized in that the ESD protective device is ESD protection diode, transient state
One of voltage suppression diode, varistor and gas-discharge tube.
8. a kind of electronic equipment, which is characterized in that the electronic equipment include: shell, printing board PCB, circuit system and
Esd protection circuit as described in any one of claim 1 to 7, wherein
The shell offers the first opening and the second opening, the setting of the setting position and the input terminal of first opening
Position is corresponding, and the setting position of second opening is corresponding with the setting position of the ground terminal；
The PCB is set in the shell, and the circuit system and the esd protection circuit are provided on the PCB；
The circuit system is connect with the output end of the esd protection circuit.
9. electronic equipment according to claim 8, which is characterized in that the input terminal and the ground terminal are respectively by metal
Contact is formed, and one end of the metal contact element is set on the PCB, the other end of the metal contact element be used for it is outer
The output end of portion's power supply connects.
10. electronic equipment according to claim 9, which is characterized in that the electronic equipment is wireless headset, the metal
The distance of the other end of contact to the outer surface of the shell is 2 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810995610.8A CN109149540A (en) | 2018-08-29 | 2018-08-29 | A kind of esd protection circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810995610.8A CN109149540A (en) | 2018-08-29 | 2018-08-29 | A kind of esd protection circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109149540A true CN109149540A (en) | 2019-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810995610.8A Pending CN109149540A (en) | 2018-08-29 | 2018-08-29 | A kind of esd protection circuit and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110198503A (en) * | 2019-04-25 | 2019-09-03 | 华为技术有限公司 | A kind of wireless headset |
| CN112072626A (en) * | 2020-09-16 | 2020-12-11 | 亿嘉和科技股份有限公司 | Electrostatic protection circuit and wire stripper |
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| CN201323446Y (en) * | 2008-12-01 | 2009-10-07 | 闻泰集团有限公司 | Static-free handheld mobile device with soft USB function |
| CN201504095U (en) * | 2009-09-11 | 2010-06-09 | 深圳市中兴移动通信有限公司 | Electrostatic discharge protection circuit of voltage fluctuation sensitive-class power signal line |
| CN103001201A (en) * | 2011-09-13 | 2013-03-27 | 黄岩 | Method and device for suppressing high-energy surge |
| CN205791590U (en) * | 2016-05-11 | 2016-12-07 | 安徽锐能科技有限公司 | Battery management system power supply circuits |
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| CN201323446Y (en) * | 2008-12-01 | 2009-10-07 | 闻泰集团有限公司 | Static-free handheld mobile device with soft USB function |
| CN201504095U (en) * | 2009-09-11 | 2010-06-09 | 深圳市中兴移动通信有限公司 | Electrostatic discharge protection circuit of voltage fluctuation sensitive-class power signal line |
| CN103001201A (en) * | 2011-09-13 | 2013-03-27 | 黄岩 | Method and device for suppressing high-energy surge |
| CN205791590U (en) * | 2016-05-11 | 2016-12-07 | 安徽锐能科技有限公司 | Battery management system power supply circuits |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110198503A (en) * | 2019-04-25 | 2019-09-03 | 华为技术有限公司 | A kind of wireless headset |
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| CN112072626A (en) * | 2020-09-16 | 2020-12-11 | 亿嘉和科技股份有限公司 | Electrostatic protection circuit and wire stripper |
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Application publication date: 20190104 |