CN209526516U - A kind of ESD protection circuit and detector - Google Patents
A kind of ESD protection circuit and detector Download PDFInfo
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- CN209526516U CN209526516U CN201920184625.6U CN201920184625U CN209526516U CN 209526516 U CN209526516 U CN 209526516U CN 201920184625 U CN201920184625 U CN 201920184625U CN 209526516 U CN209526516 U CN 209526516U
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Abstract
The utility model discloses a kind of ESD protection circuit and the detector with ESD protection circuit；Above-mentioned ESD protection circuit includes: capacitor and ESD protection device, and one end connection of capacitor is for receiving the signal transmssion line of input signal all the way, one end of the other end connection ESD protection device of capacitor, the other end ground connection of ESD protection device.The utility model can simply and effectively prevent reverse power connection, power supply short circuit to signal wire etc. from causing the damage of ESD protection device.
Description
Technical field
The utility model relates to but be not limited to electrostatic protection technical field more particularly to a kind of static discharge (ESD,
Electrostatic Discharge) protection circuit and detector.
Background technique
Static discharge (ESD, Electrostatic Discharge) be released by a non-conductive surface moment it is quiet
State electric current, static discharge will cause the damage of electronic component and performance decline in circuit, therefore, get over to the protection of static discharge
To be more taken seriously.
Utility model content
The utility model embodiment provides a kind of ESD protection circuit and detector, can simply and effectively prevent power supply
Reversal connection, power supply short circuit to signal wire etc. cause the damage of ESD protection device.
On the one hand, the utility model embodiment provides a kind of ESD protection circuit, comprising: capacitor and ESD protection device；
One end connection of the capacitor is for receiving the signal transmssion line of input signal all the way, described in the other end of the capacitor connects
One end of ESD protection device, the other end ground connection of the ESD protection device.
On the other hand, the utility model embodiment provides a kind of detector, including above-mentioned ESD protection circuit.
In the utility model embodiment, one end connection of capacitor is used to receive the signal transmssion line of input signal all the way,
One end of the other end connection ESD protection device of capacitor, the other end ground connection of ESD protection device；By the way that ESD protection device is connected
It connects in the rear end of capacitor, to simply and effectively prevent power supply misplug and accidentally be shorted to signal transmssion line bring failure.
Other features and advantages of the utility model will illustrate in the following description, also, partly from specification
In become apparent, or understood and implementing the utility model.The purpose of this utility model and other advantages can pass through
Specifically noted structure is achieved and obtained in the specification, claims and drawings.
Detailed description of the invention
Attached drawing is used to provide to further understand technical solutions of the utility model, and constitutes part of specification,
It is used to explain the technical solution of the utility model together with embodiments herein, not constitute to technical solutions of the utility model
Limitation.
Fig. 1 is a kind of schematic diagram of traditional ESD protection circuit；
Fig. 2 is a kind of illustrative diagram of ESD protection circuit provided by the embodiment of the utility model；
Fig. 3 is another illustrative diagram of ESD protection circuit provided by the embodiment of the utility model.
Specific embodiment
The embodiments of the present invention are described in detail below in conjunction with attached drawing.It should be noted that not conflicting
In the case where, the features in the embodiments and the embodiments of the present application can mutual any combination.
In order to remove common mode interference, signal is transmitted to be transmitted usually using AC coupled signals.With detector (for example, ray
Detector) for, it in debugging, installation and maintenance, is both needed to operate signaling interface, it is therefore desirable to carry out in interface
ESD protection design.Common safeguard procedures are to add ESD protection circuit, such as ESD protection diode in interface.
Fig. 1 is a kind of schematic diagram of traditional ESD protection circuit.As shown in Figure 1, one end of capacitor C11 is connected for connecing
The AC coupled transmission line of input signal all the way is received, the cathode of ESD protection diode D11 connects the AC coupled transmission line, ESD
Protect the plus earth of diode D11.Wherein, ESD protection diode D11 is connected to the front end of capacitor C11.ESD shown in FIG. 1
The protection circuit not protection consideration for reverse power connection, power supply short circuit to signal wire, reverse power connection, power supply short circuit to signal wire
It will cause the damage of ESD protection diode D11.Power supply short circuit is to AC coupled signals transmission line in order to prevent, generallys use pair
The clamp circuit of ground and supply connection, with guarantee the voltage of AC coupled signals transmission line in clamp voltage range, however, this
Kind mode needs to increase additional component.
The embodiment of the present application provides a kind of ESD protection electricity with reverse power connection, power supply short circuit to signal wire safeguard function
Road, in the case where not increasing additional devices, can prevent reverse power connection, power supply short circuit compared to traditional ESD protection circuit
To the damage of ESD protection device caused by signal wire, to enhance the reliability of the equipment with ESD protection function.
The embodiment of the present application provides a kind of ESD protection circuit, comprising: capacitor and ESD protection device；Wherein, capacitor
One end connection connects one end of ESD protection device for receiving the signal transmssion line of input signal all the way, the other end of capacitor,
The other end of ESD protection device is grounded.
Fig. 2 show a kind of illustrative diagram of ESD protection circuit provided by the embodiments of the present application.In this exemplary reality
It applies in example, ESD protection device is illustrated by taking ESD protection diode as an example.In the present exemplary embodiment, signal transmssion line is used for
Transmit AC coupled signals.As shown in Fig. 2, ESD protection circuit provided in this embodiment includes: capacitor C21 and ESD protection two
Pole pipe D21；One end connection of capacitor C21 is for receiving the signal transmssion line of input signal all the way, the other end connection of capacitor C21
The cathode of ESD protection diode D21, the plus earth of ESD protection diode D21.Wherein, ESD protection diode D21 is connected to
The rear end of capacitor C21.
Wherein, the application for the capacitor C21 component connected with the rear end of ESD protection diode D21 or circuit not
It limits, for example, can be data processing circuit.
As shown in Fig. 2, the parameter of the coupled capacitor C21 by selection signal transmission line, it is ensured that the pressure resistance of capacitor C21
Parameter is greater than supply voltage, and the pressure-resistant parameter of capacitor C21 is higher than its external ESD impact accumulation voltage being subject to, while meeting friendship
Coupled signal transmission is flowed to need.Wherein, the load voltage value of capacitor C21 can be greater than supply voltage value, the capacitance of capacitor C21
It can be determined according to the frequency of AC coupled signals transmission line, for example, the frequency of AC coupled signals transmission line is higher, then capacitor
The capacitance of C21 is smaller.
As shown in Fig. 2, increasing ESD protection diode D21 after ac coupling capacitor C21.Due to esd discharge transient voltage
It is larger, and signal voltage is smaller, then by the parameter of selection ESD protection diode D21, it is ensured that reach the same of protecting effect
When, the transmission of signal is not influenced.The application does not limit the selection mode of the parameter of ESD protection diode D21.
As shown in Fig. 2, when esd discharge occurs, Low ESR that ESD signal can be provided by ac coupling capacitor C21
Path reaches ESD protection diode D21, and is released to negative supply or protecting field.When generation power supply misplug or power supply short circuit
To when signal input, due to the presence of ac coupling capacitor C21, DC power supply cannot be conducting to the rear end of coupled capacitor C21, then
The damage of ESD protection diode D21 is not will cause.It is possible thereby to ESD caused by avoiding because of reverse power connection, power supply short circuit to signal wire
Protect the damage of diode D21.
In one exemplary embodiment, signal transmssion line may include following one: high frequency transmission line, radio-frequency transmission line.
Compared to ESD protection circuit shown in FIG. 1, the embodiment of the present application can be realized on AC coupled signals transmission line
While ESD protection, in the case where not increasing additional devices, simply and effectively prevents power supply misplug or be accidentally shorted to exchange coupling
Close bring failure on signal transmssion line.The embodiment of the present application not only saves component and occupied space, and reduces and set
Cost is counted, the reliability of ESD protection circuit is increased.
In one exemplary embodiment, when can be multiple, ESD protection device there are the number of multichannel input signal, capacitor
The number of part can be to be multiple, and capacitor can be corresponded with the signal transmssion line of input signal to be connected, capacitor and ESD protection device
Part can correspond connected.
Fig. 3 is a kind of illustrative diagram of ESD protection circuit provided by the embodiments of the present application.As shown in figure 3, exchanging
Coupled signal transmitting scene provides each or one group of input signal identical for there are in the case where multiple input signals
ESD protection processing.As shown in figure 3, being directed to the first input signal, one end connection of capacitor C31 is for receiving the first input letter
Number signal transmssion line, the other end connect ESD protection diode D31 anode, ESD protection diode D31 cathode ground connection；Needle
To the second input signal, one end connection of capacitor C32 is for receiving the signal transmssion line of the second input signal, other end connection
The anode of ESD protection diode D32, the cathode ground connection of ESD protection diode D32.
In the present exemplary embodiment, in the case where not increasing additional devices, prevent reverse power connection, power supply short by providing
Road not only effectively prevents ESD protection caused by reverse power connection, power supply short circuit to signal wire to the ESD protection function of signal wire
The damage of device, and component and occupied space are saved, reduce design cost, increases the reliable of ESD protection circuit
Property.
In addition, the embodiment of the present application also provides a kind of detector, including the ESD protection circuit as described in above-described embodiment.
Wherein, detector can be ray detector, for example, X-ray detector.The basic functional principle of ray detector are as follows: ray
After irradiated object, because material absorbing portion of energy causes ray energy spectrum to change, it can be differentiated by detecting ray energy spectrum
Illuminated substance out.
In one exemplary embodiment, ray detector may include multiple probe units and a data processing unit；
Wherein, after ray passes through irradiated object, probe unit can be absorbed ray and be converted to electronic signal, and electronic signal is turned
It changes digital signal into, digital data transmission is carried out to data processing unit by imaging by cable.Wherein, probe unit and
ESD protection circuit provided by the above embodiment can be set by the interface that cable is connected between data processing unit, thus
While realizing ESD protection on the AC coupled signals transmission line of ray detector, it can simply and effectively prevent power supply wrong
Insert or be accidentally shorted to bring failure on signal transmssion line.
In description in the present invention, it should be noted that term " on ", "lower", " side ", " other side ", " one
The orientation or positional relationship of the instructions such as end ", " other end ", " side ", " opposite ", " quadrangle ", " periphery ", " " mouth " word structure " is base
In orientation or positional relationship shown in the drawings, be merely for convenience of describing the present invention and simplifying the description, rather than indicate or
It implies that signified structure has specific orientation, is constructed and operated in a specific orientation, therefore should not be understood as practical new to this
The limitation of type.
In the description of the utility model embodiment unless specifically defined or limited otherwise, term " connection ", " directly
Connection ", " being indirectly connected with ", " being fixedly connected ", " installation ", " assembly " shall be understood in a broad sense, for example, it may be fixedly connected,
It can be and be detachably connected, or be integrally connected；Term " installation ", " connection ", " being fixedly connected " can be directly connected, can also
Indirectly connected through an intermediary, can be the connection inside two elements.For the ordinary skill in the art,
The concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
Although embodiment disclosed by the utility model is as above, the content only the utility model for ease of understanding
And the embodiment used, it is not intended to limit the utility model.Technical staff in any the utility model fields,
Under the premise of not departing from spirit and scope disclosed by the utility model, it can be carried out in the form and details of implementation any
Modification and variation, but the scope of patent protection of the utility model, the appended claims that must still be subject to are defined.
Claims (5)
1. a kind of ESD protection circuit characterized by comprising
Capacitor and ESD protection device；
One end connection of the capacitor connects institute for receiving the signal transmssion line of input signal all the way, the other end of the capacitor
State one end of ESD protection device, the other end ground connection of the ESD protection device.
2. ESD protection circuit according to claim 1, which is characterized in that the ESD protection device includes ESD protection two
Pole pipe；The other end of the capacitor connects the cathode of the ESD protection diode, the plus earth of the ESD protection diode.
3. ESD protection circuit according to claim 1, which is characterized in that the signal transmssion line includes following one: high
Frequency transmission line, radio-frequency transmission line.
4. ESD protection circuit according to claim 1, which is characterized in that when there are multichannel input signal, the capacitor
Number be it is multiple, the number of the ESD protection device be it is multiple, the signal transmssion line of the capacitor and the input signal is one by one
Corresponding to be connected, the capacitor is connected with ESD protection device one-to-one correspondence.
5. a kind of detector, which is characterized in that including ESD protection circuit according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920184625.6U CN209526516U (en) | 2019-02-01 | 2019-02-01 | A kind of ESD protection circuit and detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920184625.6U CN209526516U (en) | 2019-02-01 | 2019-02-01 | A kind of ESD protection circuit and detector |
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| Publication Number | Publication Date |
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| CN209526516U true CN209526516U (en) | 2019-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920184625.6U Active CN209526516U (en) | 2019-02-01 | 2019-02-01 | A kind of ESD protection circuit and detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023040583A1 (en) * | 2021-09-17 | 2023-03-23 | 中兴光电子技术有限公司 | Electrostatic discharge protection circuit, protection unit, chip and apparatus |
-
2019
- 2019-02-01 CN CN201920184625.6U patent/CN209526516U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023040583A1 (en) * | 2021-09-17 | 2023-03-23 | 中兴光电子技术有限公司 | Electrostatic discharge protection circuit, protection unit, chip and apparatus |
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