CN106803668A - A kind of sensor external terminal protection device - Google Patents
A kind of sensor external terminal protection device Download PDFInfo
- Publication number
- CN106803668A CN106803668A CN201710133722.8A CN201710133722A CN106803668A CN 106803668 A CN106803668 A CN 106803668A CN 201710133722 A CN201710133722 A CN 201710133722A CN 106803668 A CN106803668 A CN 106803668A
- Authority
- CN
- China
- Prior art keywords
- protection circuit
- diode
- electric capacity
- magnetic bead
- analog switch
- 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.)
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Classifications
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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
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
- H02H9/046—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere responsive to excess voltage appearing at terminals of integrated circuits
Abstract
The invention discloses a kind of sensor external terminal protection device, it includes the first order protection circuit, the second level protection circuit that are sequentially connected, also including third level protection circuit.First order protection circuit filters treatment of releasing for doing the first order to signal；Second level protection circuit filters treatment of releasing for doing the second level to the signal that first order protection circuit is treated.First order protection circuit is the whole key protected and release, and most of energy is all consumed in the first order protection circuit being made up of front end inductance and transient diode.Protection circuit topmost effect in the second level is the energy that first order protection circuit do not process completely of releasing, so as to ensure that energy can be consumed fully, it is to avoid senser element suffers damage.Protection device of the invention is very suitable for protection of the electrical fire field to sensor external terminal, the protection of sensor in other industrial products is also applied for, with very wide application prospect.
Description
Technical field
The application is related to circuit protection field, and in particular to a kind of sensor external terminal protection device.
Background technology
Electro Magnetic Compatibility (EMC, Electromagnetic Compatibility) refers to equipment or system in its electromagnetism ring
Met the requirements in border operation and not to its environment in any equipment produce the ability of intolerable electromagnetic interference.EMC bags
Include two requirements of aspect：On the one hand refer to that equipment can not surpass in normal course of operation to the electromagnetic interference that place environment is produced
Cross certain limit value；On the other hand refer to that utensil has a certain degree of immunity to interference to electromagnetic interference present in the environment of place,
That is electromagnetic susceptibility.
Product comprising sensor wire terminal at present, have plenty of sensor terminal is all built-in, because terminal is not outer
Leakage, therefore cause product to use inconvenience in itself；Some products cause product cost high and account in input front end plus common mode inductance
Use significant volume；Some use magnet rings, then take more volume.When sensor connection terminal especially multiple ends of such product
When son exposes, if EMC processes bad, ESD (electrostatic discharge, static discharge), surge
(peak value beyond stationary value, including surge voltage and surge current occur in Electrical surge between referring in wink) test or existing
Product is easily caused during the static discharge of field to crash or reset, and device failure can be caused when serious.
The content of the invention
According to an aspect of the present invention, there is provided a kind of sensor external terminal protection device, it includes be sequentially connected
First class of protection circuit, second level protection circuit；The first order protection circuit is used for the signal from sensor external terminal
Do the first order and filter treatment of releasing；The second level protection circuit is used to do the signal that the first order protection circuit is treated
The second level filters treatment of releasing.
Protection device of the invention can be used for electrically, in fire protection field to the EMC protections of sensor external terminal, the
First class of protection circuit is the whole key protected and release, and most of energy is all consumed by front end inductance and transient diode group
Into first order protection circuit on.Although being reduced much by energy after first order protection circuit, the electricity more than 100V
Pressure is still enough to break the integrated circuit of correlation, and protection circuit topmost effect in the second level is that first order protection circuit of releasing does not have
The energy for processing completely, so as to ensure that energy can be consumed fully, it is to avoid senser element suffers damage.Protection device of the invention
Protection of the electrical fire field to sensor external terminal is especially suitable for, the guarantor of sensor in other industrial products is also applied for
Shield, with very wide application prospect.
Brief description of the drawings
Fig. 1 is the protection device and residual current transformer connection diagram of embodiment one；
Fig. 2 is the protection device and temperature sensor connection diagram of embodiment one；
Fig. 3 is the first order protection circuit structural representation of the protection device of embodiment one；
Fig. 4 is the relation schematic diagram of high-frequency inductor impedance absolute value and frequency；
Fig. 5 is the second level protection circuit structural representation of the protection device of embodiment one；
Fig. 6 is the third level protection circuit structural representation of the protection device of embodiment one.
Specific embodiment
The application is described in further detail below by specific embodiment combination accompanying drawing.
Embodiment one：
The sensor external terminal protection device of the present embodiment includes the first order protection circuit and the second level that are sequentially connected
Protection circuit, also including third level protection circuit.
The sensor external terminal protection device 10 of the present embodiment both can be with residual current transformer 20 as shown in Figure 1
Connection, it is also possible to be connected with temperature sensor 30 as shown in Figure 2, may also connect to other types of sensor external connection end
Son.Can be applied to sensor external terminal contact discharge 8KV tests and the surging line protection that 1KV impacts over the ground.
As shown in figure 3, first order protection circuit includes the one or four inductance L14, the 3rd transient diode D3, the 8th inductance
L8, the 5th transient diode D5.One or four inductance L14, the 8th inductance L8 are high-frequency inductor.
The input of the one or four inductance L14 is used to receive the first signal SIN1_A from sensor external terminal, and its is defeated
Go out the first end that end is connected to the 3rd transient diode D3；The input of the 8th inductance L8 is used to receive from sensor external connection end
The secondary signal SIN1_B of son；Second end of the 3rd transient diode D3 and the output end of the 8th inductance L8 are connected to the 5th transient state
The first end of diode D5, the output head grounding of the 5th transient diode D5.First signal SIN1_A and secondary signal SIN1_B
Can be the current signal that residual current transformer is produced or the signal that temperature sensor is produced, be analog quantity.
First order protection circuit filters the place that releases for doing the first order to the first signal SIN1_A and secondary signal SIN1_B
Reason, the 3rd transient diode D3, the 5th transient diode D5 are used to suppress the high-voltage pulse of electrostatic generation, by the 5th transient state two
Pole pipe D5 is released to the GND of system.Actual tests result surface, by the one or four inductance L14, two high-frequency inductors of the 8th inductance L8
Being placed on end of incoming cables can reach best effect.The induction reactance characteristic of inductance can well suppress sensor terminal when ESD is tested and produce
Raw spark discharge and then the impulse disturbances for causing, this spark discharge are a kind of extremely complex physical phenomenons, in mobile fire
In the case of flower gap, when velocity variations, the rise time (climbing speed) of resulting discharge current can be from less than 1nS
Value changed to more than the value of 20ns, thus produce the checker in electric field and magnetic field, cause circuit, the device to product
Part, printed circuit board (PCB) can produce strong crosstalk and radiation.
High-frequency inductor equivalent circuit be inductance in itself after the series connection of parasitic capacitance C, equivalent resistance and inductance and together with constitute,
The high frequency characteristics of inductance is different from the expected characteristic of ideal inductance, shown in such as Fig. 4 and formula (1), when frequency approaches resonance point,
The impedance of high-frequency inductor is improved rapidly；When frequency continues to improve, parasitic capacitance C turns into main influence factor, coil impedance
Gradually reduce.The impulse disturbances produced when thus selecting the high-frequency inductor of suitable parameters to electrostatic test have buffering well and inhale
The function of decay is received, actual test shows, using high-frequency inductor than having more preferable effect using the magnetic bead of various plug-in units.
In formula (1), ZeIt is the equivalent resistance of inductance, w is angular frequency, and L is own inductance (perfect condition), RLIt is loss
Resistance, CLIt is distribution capacity.
The DM EMI that 3rd transient diode D3 is produced to electrostatic and surge is produced has the good effect of releasing, when the 3rd
When the voltage at transient diode D3 two ends is higher than its threshold voltage, the 3rd transient diode D3 can be turned on so that energy ezpenditure immediately
Fall or return GND to consume, the 5th transient diode D5 there are common mode disturbances the good effect of releasing, the 5th transient diode D5
Reaction time be ns ranks and capacitive reactance is 1.5pf to the maximum.
ESD is tested and surge test can all produce different pulses, lightning surge to be mainly characterized by energy big, electrostatic
It is mainly characterized by the wide ranges of pulse.Specifically, when ESD is tested, the effect of the one or four inductance L14 is to buffer, absorb, decaying,
The effect of the 8th inductance L8 is to buffer, absorb, decaying, and the effect of the 3rd transient diode D3 is to release, the 5th transient diode
The effect of D5 is to release；During surge test, the effect of the one or four inductance L14 is buffering, and the effect of the 8th inductance L8 is buffering, the
The effect of three transient diode D3 be release, the effect of the 5th transient diode D5 is to release.
One or four inductance L14 output ends of first order protection circuit are connected to the first paster magnetic bead of second level protection circuit
BL1 inputs；8th inductance L8 output ends of first order protection circuit are connected to the second paster magnetic bead of second level protection circuit
BL2 inputs.The SIN1_A1 signal outputs that first signal SIN1_A is produced after being processed through the one or four inductance L14 to the second level is protected
First paster magnetic bead BL1 inputs of protection circuit；Secondary signal SIN1_B produces SIN1_B1 signals after being processed through the 8th inductance L8
Export to the second paster magnetic bead BL2 inputs of second level protection circuit.
As shown in figure 5, second level protection circuit includes the first paster magnetic bead BL1, the one or seven transient diode D17, second
Six switching diode D26, the second paster magnetic bead BL2, the one or six transient diode D16, the two or nine switching diode D29, simulation
Switch module U3, the 8th electric capacity C80, the 5th electric capacity C5.Paster magnetic bead is a kind of passive device, also referred to as magnet ring, EMI filtering
Device, iron core etc., are a kind of special choke coils, and its composition is mostly ferrite, is exclusively used in suppressing the height on holding wire, power line
Frequency noise and spike are disturbed, with the ability for absorbing electrostatic pulse.Paster magnetic bead is mainly used in absorbing ultra-high frequency signal, there is very high
Resistivity and magnetic conductivity, be equivalent to resistance and inductance series connection, but resistance value and inductance value all with frequency change.
The input of the first paster magnetic bead BL1 is used to receive SIN1_A1 signals, and its output end is connected to the one or seven transient state two
The first end of pole pipe D17, the first end of the two or six switching diode D26, the COM1 ends of analog switch module U3；One or seven transient state
The second end ground connection of diode D17；Second termination+3.3V the power supplys of the two or six switching diode D26, its 3rd end ground connection.The
The input of two paster magnetic bead BL2 is used to receive SIN1_B1 signals, and its output end is connected to the one or six transient diode D16's
First end, the first end of the two or nine switching diode D29, the COM2 ends of analog switch module U3；One or six transient diode D16
The second end ground connection；Second termination+3.3V the power supplys of the two or nine switching diode D29, its 3rd end ground connection.
The first end of the 8th electric capacity C80 and the first end of the 5th electric capacity C5 be connected to analog switch module U3 VCC ends and+
3.3V power supplys；Second end of the 8th electric capacity C80 and the second end ground connection of the 5th electric capacity C5；8th electric capacity C80 be electrochemical capacitor or
Electric capacity with polarity, its second end is negative pole end.The design of the 8th electric capacity C80 and the 5th electric capacity C5 can ensure analog switch mould
Block U3 normal works are so as to interference-free.
One or seven transient diode D17, the one or six transient diode D16 can specifically use ESDA-05 transient diodes, the
Two or six switching diode D26, the two or nine switching diode D29 can specifically use D26Bav99 switching diodes.
First paster magnetic of the SIN1_A1 signals and SIN1_B1 signals of first order protection circuit output respectively through 600 Ω
Pearl BL1 and the second paster magnetic bead BL2 do and once filter, for example, filter the signal of 90-150Mhz scopes, then respectively through the one or six
Transient diode D16 and the one or seven transient diode D17 further release for ESD (5v) device carries out interference, and the present embodiment can
With using cache switching diodes (High-speed switching diodes), such as switching diode of BAV99 models,
The interference voltage clamper of sensor signal lines can be made in certain scope, electrostatic interference and the surge impact to device is dropped
To minimum, the phenomenon of device failure is prevented.BAV99 is one kind of semiconductor diode, its from turn on be changed into cut-off or by
Time needed for cut-off is changed into conducting is shorter than general diode, is mainly used in on-off circuit, detecting circuit, the height of electronic equipment
Frequency and impulse commutation circuit and automatic control circuit.
The IN1 ends of analog switch module U3 are used to receive TS_SEL0 signals, and its IN2 end is used to receive TS_SEL1 signals；
TS_SEL0 signals and TS_SEL1 signals are respectively MCU (Micro Control Unit, micro-control unit) control analog switches
The signal of module U3 strobe pins.Its NC1 end and NC2 ends are grounded by the first resistor R109 of 1K.Its NO1 end is used to export
TS_IN1 signals, its NO2 end is used to export TS_IN2 signals；TS_IN1 signals and TS_IN2 signals are respectively by analog switch
Output signal after module gating, is transferred to MCU.Its GND end is grounded.SIN1_A1 signals, SIN1_B1 signals, TS_SEL0 letters
Number, TS_SEL1 gated by analog switch module U3, then the analog-to-digital conversion I/O port for exporting micro-control unit.
As shown in fig. 6, third level protection circuit includes the first magnetic bead L1, the second magnetic bead L2, the two or three transient diode
D23, the 3rd electric capacity C36, the 4th resistance R4, third level protection circuit are total leadage circuits of power filter and GND interference signals.
The input of the first magnetic bead L1 is connected to total input filter end of the sensor of sensor, and its output end is connected to
The first end and power supply of two or three transient diode D23；The input of the second magnetic bead L2 is connected to the earth terminal of sensor；Two or three
Second end of transient diode D23 and the output head grounding of the second magnetic bead L2.The first end and the 4th resistance R4 of the 3rd electric capacity C36
First end ground connection, the second end ground connection of second end of the 3rd electric capacity C36 and the 4th resistance R4.First magnetic bead L1, the second magnetic bead
Model BL3-3.5 × 6 of L2.
First magnetic bead L1, the second magnetic bead L2 can be using the ferrites (magnetic bead) of plug-in unit, to the ESD of sensor power part
There is good filter action with surge interference (i.e. to the absorption function of clutter).Two or three transient diode D23 can be disposed
The DM EMI signal at sensor power end, the 3rd electric capacity C36 (i.e. high-voltage capacitance) and four resistance R4 (i.e. bleeder resistance) are letting out
The interference for being put into whole product is released to the earth.
The protection device of the present embodiment can be used for electrically, in fire protection field to the EMC protections of sensor external terminal,
First order protection circuit is the whole key protected and release, and most of energy is all consumed by front end inductance and transient diode
In the first order protection circuit of composition.Although being reduced a lot, more than 100V's by energy after first order protection circuit
Voltage is still enough to break the integrated circuit of correlation, and protection circuit topmost effect in the second level is that first order protection circuit of releasing does not have
There is the energy for processing completely, so as to ensure that energy can be consumed fully, it is to avoid senser element suffers damage.Third level power protection
Circuit is the path that whole circuit system is released, offer protection of being powered to sensor or circuit system.The protection dress of the present embodiment
Put and reduce product cost, reduce the volume of product, released by multistage, be especially suitable for electrical fire field to sensor outside
The protection of connecting terminal, is also applied for the protection of sensor in other industrial products, with very wide application prospect.
Above content is to combine the further description that specific embodiment is made to the application, it is impossible to assert this Shen
Specific embodiment please is confined to these explanations.For person of an ordinary skill in the technical field, do not departing from
On the premise of the design of the application, some simple deduction or replace can also be made.
Claims (10)
1. a kind of sensor external terminal protection device, it is characterised in that including the first order protection circuit, second that are sequentially connected
Level protection circuit；
The first order protection circuit filters treatment of releasing for doing the first order to the signal from sensor external terminal；
The second level protection circuit filters the place that releases for doing the second level to the signal that the first order protection circuit is treated
Reason.
2. device as claimed in claim 1, it is characterised in that
The first order protection circuit includes the one or four inductance, the 3rd transient diode, the 8th inductance, the 5th transient diode；
The input of the one or four inductance is used to receive the first signal from sensor external terminal, and its output end is connected to
The first end of the 3rd transient diode；
The input of the 8th inductance is used to receive the secondary signal from sensor external terminal；
Second end of the 3rd transient diode and the output end of the 8th inductance are connected to the 5th transient diode
First end, the output head grounding of the 5th transient diode.
3. device as claimed in claim 1, it is characterised in that
The second level protection circuit includes the first paster magnetic bead, the one or seven transient state diode, the two or six switching diode, second
Paster magnetic bead, the one or six transient diode, the two or nine switching diode, analog switch module；
The input of the first paster magnetic bead is used to receive the SIN1_A1 signals from the first order protection circuit, and its is defeated
Go out first end, first end, the simulation of the two or six switching diode that end is connected to the one or seven transient diode
Switch module；
The second end ground connection of the one or seven transient diode；
Second termination power of the two or six switching diode, its 3rd end ground connection；
The input of the second paster magnetic bead is used to receive the SIN1_B1 signals of the first order protection circuit, its output end
It is connected to first end, first end, the analog switch of the two or nine switching diode of the one or six transient diode
Module；
The second end ground connection of the one or six transient diode；
Second termination power of the two or nine switching diode, its 3rd end ground connection.
4. device as claimed in claim 3, it is characterised in that
The output end of the first paster magnetic bead, the first end of the one or seven transient diode, two poles of the two or six switch
The first end of pipe is connected to the COM1 ends of the analog switch module；
The IN1 ends of the analog switch module are used to receive TS_SEL0 signals；
The IN2 ends of the analog switch module are used to receive TS_SEL1 signals, and the TS_SEL0 signals and the TS_SEL1 believe
Number be respectively described in micro-control unit controls analog switch module gating pin signal；
The output end of the second paster magnetic bead, the first end of the one or six transient diode, two poles of the two or nine switch
The first end of pipe is connected to the COM2 ends of the analog switch module；
The NC1 ends and NC2 ends of the analog switch module are grounded by first resistor；
The NO1 ends of the analog switch module are used to export TS_IN1 signals；
The NO2 ends of the analog switch module are used to export TS_IN2 signals, the TS_IN1 signals and the TS_IN2 signals
Respectively by the output signal after analog switch module gating；
The GND ends ground connection of the analog switch module.
5. device as claimed in claim 3, it is characterised in that
Also include the 8th electric capacity, the 5th electric capacity；
The first end of the 8th electric capacity and the first end of the 5th electric capacity are connected to the analog switch module and power supply；
Second end of the 8th electric capacity and the second end ground connection of the 5th electric capacity.
6. device as claimed in claim 5, it is characterised in that
8th electric capacity is electrochemical capacitor or the electric capacity with polarity；
Second end of the 8th electric capacity is negative pole end.
7. device as claimed in claim 5, it is characterised in that
3rd end of the two or six switching diode, the 3rd end of the two or nine switching diode, the 8th electric capacity
First end, the first end of the 5th electric capacity are connected to+3.3V power supplys.
8. device as claimed in claim 3, it is characterised in that
One or four inductance output end of the first order protection circuit is connected to the first paster magnetic of the second level protection circuit
Pearl input；8th inductance output end of the first order protection circuit is connected to the second paster of the second level protection circuit
Magnetic bead input.
9. the device as described in claim any one of 1-8, it is characterised in that also including being released path as whole sensor
Third level protection circuit；
The third level protection circuit includes the first magnetic bead, the second magnetic bead, the two or three transient diode, the 3rd electric capacity, the 4th electricity
Resistance；
The input of first magnetic bead is used to be connected to total input filter end of sensor, and its output end is connected to described second
The first end and power supply of three transient diodes；
The input of second magnetic bead is used to be connected to the earth terminal of sensor；
Second end of the two or three transient diode and the output head grounding of second magnetic bead；
The first end ground connection of the first end of the 3rd electric capacity and the 4th resistance, the second end of the 3rd electric capacity and described
The second end ground connection of the 4th resistance.
10. the device as described in claim any one of 1-8, it is characterised in that
The sensor external terminal protection device is used to connect with the external terminal of temperature sensor and/or residual current transformer
Connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710133722.8A CN106803668A (en) | 2017-03-08 | 2017-03-08 | A kind of sensor external terminal protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710133722.8A CN106803668A (en) | 2017-03-08 | 2017-03-08 | A kind of sensor external terminal protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106803668A true CN106803668A (en) | 2017-06-06 |
Family
ID=58987889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710133722.8A Pending CN106803668A (en) | 2017-03-08 | 2017-03-08 | A kind of sensor external terminal protection device |
Country Status (1)
| Country | Link |
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| CN (1) | CN106803668A (en) |
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Application publication date: 20170606 |