CN104901270A - Self-recovery high side overvoltage protection circuit for electronic control unit of nitrogen oxygen sensor - Google Patents
Self-recovery high side overvoltage protection circuit for electronic control unit of nitrogen oxygen sensor Download PDFInfo
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- CN104901270A CN104901270A CN201510222715.6A CN201510222715A CN104901270A CN 104901270 A CN104901270 A CN 104901270A CN 201510222715 A CN201510222715 A CN 201510222715A CN 104901270 A CN104901270 A CN 104901270A
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Abstract
The invention discloses a self-recovery high side overvoltage protection circuit for an electronic control unit of a nitrogen oxygen sensor. The circuit comprises an MOS (Metal Oxide Semiconductor) transistor C2, a comparator C1, a voltage regulator tube D1, a first voltage dividing branch and a second voltage dividing branch; by comparing voltages between positive and negative input ends, when the voltage at the positive input end is greater than that at the negative input end, the comparator automatically controls the output end thereof to output high level, so as to realize disconnection of the MOS transistor C2 connected with the output end of the comparator and then realize high voltage protection; and when the voltage at the positive input end is smaller than that at the negative input end, the comparator automatically controls the output end thereof to output low level, so as to realize connection of the MOS transistor C2 connected with the output end and then realize self-recovery. The circuit is used for protecting the electronic control unit and improves the measurement precision of the nitrogen oxygen sensor at the same time.
Description
Technical field
The invention belongs to nitrogen oxide sensor field, more specifically, relate to a kind of nitrogen oxide sensor ECU (Electrical Control Unit) self-recoverage height side overvoltage protective circuit.
Background technology
Along with the increase of vehicles number, the tail gas of motor vehicle emission has become main atmosphere pollution, and wherein the pollution of nitrogen oxide is particularly serious.Along with the appearance of more and more stricter automobile exhaust emission standard, need to detect in real time the discharged nitrous oxides in vehicle exhaust, and nitrogen oxide sensor is one of core component in this detection system.
Nitrogen oxide sensor chip as shown in Figure 1, suppressed by several layers of zirconia ceramics substrate and form, its ECU (Electrical Control Unit) comprises two parts, Survey control ECU (Electrical Control Unit) and computer heating control ECU (Electrical Control Unit) respectively, Survey control ECU (Electrical Control Unit) comprises main electrode 1, first diffusion layer 2, determines oxygen electrode 3, determines oxygen chamber 4, second diffusion layer 5, reference electrode 6, reduction chamber 7, measurement electrode 8, reference electrode 9 and with reference to chamber 10, and computer heating control ECU (Electrical Control Unit) comprises heating cathode 13, adds antilogous pole 12, thermometric electrode 11.Computer heating control ECU (Electrical Control Unit) can control nitrogen oxide sensor chip and remain within the scope of a steady temperature, thus the electrolyte characteristics utilizing zirconia ceramics at high temperature to present.Survey control ECU (Electrical Control Unit), by a series of control measure, can be measured 02 content that NOx decomposes out, thus calculate the content of the NOx in gas, namely completes the measurement of nitrogen oxide sensor to NOx gas.
The nitrogen oxide sensor of automobile industry has the severe feature of control strategy complexity, environment for use, the performance requirement of its antagonism transient pulse interference is very high, cause in the course of work of nitrogen oxide sensor, the situation of Survey control ECU (Electrical Control Unit) and computer heating control ECU (Electrical Control Unit) overtension may be there is, the accuracy that impact is measured, even causes the damage of nitrogen oxide sensor chip.Therefore, there is the technical need of the ECU (Electrical Control Unit) enforcement overvoltage protection for nitrogen oxide sensor.
At present; normal employing downside over-voltage protection method is protected nitrogen oxide sensor ECU (Electrical Control Unit); (1) traditional downside protection; nitrogen oxide sensor is connected to ground after metal-oxide-semiconductor, due to nitrogen oxide sensor operationally, heating voltage and detect voltage be apply with the form of square-wave voltage; employing downside is protected; because metal-oxide-semiconductor self exists a fixed resistance value, float while reference will be caused, measurement result inaccuracy.(2) downside overvoltage protection also can cause interference to the work of ECU (Electrical Control Unit), brings adverse effect to certainty of measurement, causes the measurement result inaccuracy of transducer, can not meet practical application request.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides a kind of nitrogen oxide sensor ECU (Electrical Control Unit) self-recoverage height side overvoltage protective circuit, its object is to by by multiple resistance, metal-oxide-semiconductor, comparator and voltage-stabiliser tube are electrically connected and are designed to high side overvoltage protective circuit, open circuit is there is when making oxygen nitrogen transducer ECU (Electrical Control Unit) both end voltage be greater than rated voltage, and at voltage lower than conducting during rated voltage, the corresponding nitrogen oxide sensor ECU (Electrical Control Unit) that avoids suffers instantaneous pressure impact and damage, this high side high voltage protective avoids in downside overvoltage protection to exist measures coarse problem.
For achieving the above object; the invention provides a kind of nitrogen oxide sensor ECU (Electrical Control Unit) self-recoverage height side overvoltage protective circuit; for the protection of the measurement precision improving nitrogen oxide sensor while ECU (Electrical Control Unit); it is characterized in that; comprise metal-oxide-semiconductor C2, comparator C1, voltage-stabiliser tube D1; sectional pressure element, the first dividing potential drop branch road and the second dividing potential drop branch road, wherein
The S pole of described metal-oxide-semiconductor C2 is connected with external power supply negative pole, and its D pole is connected with nitrogen oxide sensor ECU (Electrical Control Unit) positive terminal, and its G pole is connected with the output of comparator C1;
The power positive end of described comparator C1 is connected with external power supply positive pole, and its power-is extremely connected with nitrogen oxide sensor ECU (Electrical Control Unit) negative pole end by sectional pressure element;
Described voltage-stabiliser tube D1 is connected in parallel on the power positive end of described comparator and power-is extreme, with make comparator C1 power positive end and power-extreme between maintain fixed value voltage;
The power positive end of described comparator and power-are extremely parallel with the second dividing potential drop branch road, and this second dividing potential drop branch road is connected with the negative input end of comparator, for regulating the voltage being carried in negative input end;
Described external power supply positive terminal and described nitrogen oxide sensor ECU (Electrical Control Unit) negative pole end are parallel with the first dividing potential drop branch road, and this first dividing potential drop branch road is connected with the positive input terminal of comparator, for regulating the voltage being carried in positive input terminal;
Described comparator is by voltage between more positive and negative input, it is corresponding when between positive input terminal, voltage is greater than voltage between negative input end, control comparator output terminal voluntarily and export high level, thus the metal-oxide-semiconductor C2 open circuit that realization is connected with comparator output terminal, and then realize high voltage protective; And when positive input terminal voltage is less than negative input end voltage, control comparator output terminal output low level voluntarily, thus realize the metal-oxide-semiconductor C2 conducting that is connected with output and then realize self-recoverage.
In above inventive concept, (1) metal-oxide-semiconductor C2 is connected between external power supply and nitrogen oxide sensor ECU (Electrical Control Unit), when external voltage is too high, metal-oxide-semiconductor disconnects, the equal no-voltage of whole nitrogen oxide sensor ECU (Electrical Control Unit) loads, and namely computer heating control ECU (Electrical Control Unit) wherein and the equal no-voltage of Survey control ECU (Electrical Control Unit) load.In nitrogen oxide sensor, computer heating control ECU (Electrical Control Unit) and Survey control ECU (Electrical Control Unit) are closely adjacent, and the operating voltage of Survey control ECU (Electrical Control Unit) is at about 2V, operating current usually only has several microampere, comparatively sensitive, also the interference of computer heating control ECU (Electrical Control Unit) adjacent with it is easily subject to, especially the operating voltage of heat control unit is about 20v ~ 30v, and easier formation Survey control ECU (Electrical Control Unit) disturbs, and affects its certainty of measurement.In the present invention's design; computer heating control ECU (Electrical Control Unit) and Survey control ECU (Electrical Control Unit) disconnect simultaneously rear all with reference to be connected; keep identical electronegative potential; although there is not computer heating control ECU (Electrical Control Unit) in downside over-voltage protection method to disconnect; but appoint and so keep operating voltage; then and there is between Survey control ECU (Electrical Control Unit) the problem of very large pressure reduction, correspondingly avoid the interference of computer heating control ECU (Electrical Control Unit) to Survey control ECU (Electrical Control Unit), the accuracy measured can be improved.When external voltage is suitable, comparator C1 can make metal-oxide-semiconductor C2 conducting, recovers the work of transducer; (2) nitrogen oxide sensor ECU (Electrical Control Unit) is directly connected with earth terminal, fluctuates with avoiding reference, further can improve the accuracy of measurement.Comprehensive above known, the present invention's design improves certainty of measurement while realizing high voltage protective.
Further, described sectional pressure element is the 5th resistance R5, and described 5th resistance R5 is used for dividing potential drop with the fixed value making the voltage being loaded on described comparator C1 equal voltage-stabiliser tube.
Further, described first dividing potential drop branch road comprises the first resistance R1 and the second resistance R2 of series connection mutually, and the positive input terminal of described comparator is connected between this first resistance R1 and the second resistance R2.
Further, described second dividing potential drop branch road comprises the 3rd resistance R3 and the 4th resistance R4 of series connection mutually, and the negative input end of described comparator is connected between the 3rd resistance R3 and the 4th resistance R4.
In general, the above technical scheme conceived by the present invention compared with prior art, can obtain following beneficial effect:
Metal-oxide-semiconductor C2 is connected between external power supply and nitrogen oxide sensor ECU (Electrical Control Unit), when external voltage is too high, metal-oxide-semiconductor C2 disconnects, the equal no-voltage of whole nitrogen oxide sensor ECU (Electrical Control Unit) loads, namely computer heating control ECU (Electrical Control Unit) wherein and the equal no-voltage of Survey control ECU (Electrical Control Unit) load, there is not the problem between computer heating control ECU (Electrical Control Unit) and Survey control ECU (Electrical Control Unit) in downside over-voltage protection method with pressure reduction, correspondingly avoid the interference of computer heating control ECU (Electrical Control Unit) to Survey control ECU (Electrical Control Unit), the accuracy measured can be improved; Further, nitrogen oxide sensor ECU (Electrical Control Unit) is directly connected with earth terminal, fluctuates with avoiding reference, further can improve the accuracy of measurement.
Accompanying drawing explanation
Fig. 1 is nitrogen oxide sensor chip structure schematic diagram; Be connected to the dark line shows wire of nitrogen oxide sensor ECU (Electrical Control Unit), the material object of nitrogen oxide sensor ECU (Electrical Control Unit) is circuit board, and nitrogen oxide sensor chip material object is that multilayer zirconia ceramics preform layer is stacked as one, and in this figure, oblique scribe area is zirconia ceramics compressing tablet;
Fig. 2 is self-recoverage height side overvoltage protective circuit structural representation in the embodiment of the present invention.
In all of the figs, identical Reference numeral is used for representing identical element or structure, wherein:
1-main electrode 2-first diffusion layer 3-determines oxygen electrode
4-determines oxygen chamber 5-second diffusion layer 6-reference electrode
7-reduction chamber 8-measurement electrode 9-reference electrode
10-adds antilogous pole with reference to chamber 11-thermometric electrode 12-
13-heating cathode
14-output 15-negative input end 16-positive input terminal
The extreme 18-power positive end of 17-power-
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each execution mode of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
Fig. 2 is self-recoverage height side overvoltage protective circuit structural representation in the preferred embodiments of the present invention.As seen from the figure, this circuit comprises metal-oxide-semiconductor C2, comparator C1, voltage-stabiliser tube D1, sectional pressure element, the first dividing potential drop branch road and the second dividing potential drop branch road.The S pole of wherein said metal-oxide-semiconductor C2 is connected with external power supply negative pole, and its D pole is connected with nitrogen oxide sensor ECU (Electrical Control Unit) positive terminal, and its G pole is connected with the output 14 of comparator C1.The power positive end 18 of comparator C1 is connected with external power supply positive pole, and its power-extreme 17 is connected with sectional pressure element.Voltage-stabiliser tube D1 is connected in parallel on power positive end 18 and the power-extreme 17 of comparator C1, to make to maintain fixed value voltage between comparator C1 power positive end 18 and power-extreme 17.The power positive end 18 of comparator C1 and power-extreme 17 are parallel with the second dividing potential drop branch road, and this second dividing potential drop branch road is connected with the negative input end 15 of comparator, for regulating the voltage being carried in negative input end 15.External power supply positive terminal and nitrogen oxide sensor ECU (Electrical Control Unit) negative pole end are parallel with the first dividing potential drop branch road, and this first dividing potential drop branch road is connected with the positive input terminal 16 of comparator, for regulating the voltage being carried in positive input terminal 16.Comparator is by voltage between more positive and negative input, it is corresponding when between positive input terminal, voltage is greater than voltage between negative input end, control comparator output terminal voluntarily and export high level, thus the metal-oxide-semiconductor C2 open circuit that realization is connected with comparator output terminal, and then realize high voltage protective; And when positive input terminal voltage is less than negative input end voltage, control comparator output terminal output low level voluntarily, thus realize the metal-oxide-semiconductor C2 conducting that is connected with output and then realize self-recoverage.
In a preferred embodiment of the present invention, sectional pressure element is divider resistance R5.The power-extreme 17 of comparator C1 is connected with nitrogen oxide sensor ECU (Electrical Control Unit) negative pole end by the 5th resistance R5, and described resistance R5 is used for dividing potential drop, makes the voltage being loaded on described comparator C1 equal the fixed value of voltage-stabiliser tube.In a preferred embodiment of the present invention, described first dividing potential drop branch road comprises the first resistance R1 and the second resistance R2 of series connection mutually, and the positive input terminal 16 of described comparator is connected between this first resistance R1 and the second resistance R2.
In a preferred embodiment of the present invention, described second dividing potential drop branch road comprises the 3rd resistance R3 and the 4th resistance R4 of series connection mutually, and the negative input end 15 of described comparator is connected between the 3rd resistance R3 and the 4th resistance R4.
In the present invention, voltage-stabiliser tube D1 make comparator power positive end and power-extreme between have a stable fixed value voltage, also namely the 3rd resistance R3 and the 4th resistance R4 two ends have stable fixed value voltage, thus provide the reference voltage of definite value by the negative input end that the dividing potential drop of resistance R3 and R4 is comparator.R1 and R2 by dividing potential drop for comparator positive input terminal provides measuring voltage.Because the operating voltage in the external world is in change, therefore make the measuring voltage of the positive input terminal of comparator C1 also change thereupon, namely measuring voltage changes with operating voltage change, but the reference voltage of the negative input end of comparator C1 is constant, therefore, comparator can by comparing and measuring the magnitude of voltage deciding output 14 of voltage and reference voltage, when measuring voltage is greater than reference voltage, comparator output terminal 14 exports high level, and metal-oxide-semiconductor C2 conducting hardly, is equivalent to open circuit.When measuring voltage is less than reference voltage, comparator output terminal 14 output low level, metal-oxide-semiconductor C2 conducting.
Protective circuit working mechanism of the present invention is: the present invention protects the operating voltage of nitrogen oxide sensor ECU (Electrical Control Unit) by comparator C1 and metal-oxide-semiconductor C2, and this operating voltage refers to the voltage difference being loaded into nitrogen oxide sensor ECU (Electrical Control Unit) two ends.When operating voltage is lower than load voltage value, comparator C1 output LOW voltage, metal-oxide-semiconductor conducting, nitrogen oxide sensor ECU (Electrical Control Unit) normally works; When operating voltage is higher than load voltage value, comparator output HIGH voltage, metal-oxide-semiconductor C2 only allows minimum electric current (being close to 0) by nitrogen oxide sensor ECU (Electrical Control Unit) circuit, is equivalent to open circuit, thus plays the object of overvoltage protection; When operating voltage drops to lower than load voltage value, the electric current passed through in metal-oxide-semiconductor C2 can increase, i.e. conducting again, and nitrogen oxide sensor ECU (Electrical Control Unit) recovers normal work.Namely; operating voltage is higher than rated voltage; nitrogen oxide sensor is equivalent to open circuit, and when operating voltage is lower than rated voltage, nitrogen oxide sensor can normally work; this circuit make nitrogen oxide sensor can when operating voltage is suitable automatic operation; when voltage is improper, there is open circuit to protect self, and transfer appropriate at voltage conditions; automatic operation once more, has self-healing function.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a nitrogen oxide sensor ECU (Electrical Control Unit) self-recoverage height side overvoltage protective circuit; for the protection of the measurement precision improving nitrogen oxide sensor while ECU (Electrical Control Unit); it is characterized in that; comprise metal-oxide-semiconductor C2, comparator C1, voltage-stabiliser tube D1; sectional pressure element; first dividing potential drop branch road and the second dividing potential drop branch road, wherein
The S pole of described metal-oxide-semiconductor C2 is connected with external power supply negative pole, and its D pole is connected with nitrogen oxide sensor ECU (Electrical Control Unit) positive terminal, and its G pole is connected with the output (14) of comparator C1;
The power positive end (18) of described comparator C1 is connected with external power supply positive pole, and its power-extreme (17) is connected with nitrogen oxide sensor ECU (Electrical Control Unit) negative pole end by sectional pressure element;
Described voltage-stabiliser tube D1 is connected in parallel between the power positive end (18) of described comparator and power-extreme (17), to make to maintain fixed value voltage between comparator C1 power positive end (18) and power-extreme (17);
The second dividing potential drop branch road is also parallel with between the power positive end (18) of described comparator and power-extreme (17), this the second dividing potential drop branch road is connected with the negative input end (15) of comparator, for regulating the voltage being carried in negative input end (15);
Described external power supply positive pole and described nitrogen oxide sensor ECU (Electrical Control Unit) negative pole end are parallel with the first dividing potential drop branch road, and this first dividing potential drop branch road is connected with the positive input terminal (16) of comparator, for regulating the voltage being carried in positive input terminal (16);
Described comparator is by voltage between more positive and negative input, it is corresponding when between positive input terminal, voltage is greater than voltage between negative input end, control comparator output terminal voluntarily and export high level, thus the metal-oxide-semiconductor C2 open circuit that realization is connected with comparator output terminal, and then realize high voltage protective; And when positive input terminal voltage is less than negative input end voltage, control comparator output terminal output low level voluntarily, thus realize the metal-oxide-semiconductor C2 conducting that is connected with output and then realize self-recoverage.
2. a kind of nitrogen oxide sensor ECU (Electrical Control Unit) self-recoverage height side overvoltage protective circuit as claimed in claim 1; it is characterized in that; described sectional pressure element is the 5th resistance R5, and described 5th resistance R5 is used for dividing potential drop with the fixed value making the voltage being loaded on described comparator C1 equal voltage-stabiliser tube.
3. a kind of nitrogen oxide sensor ECU (Electrical Control Unit) self-recoverage height side overvoltage protective circuit as claimed in claim 2; it is characterized in that; described first dividing potential drop branch road comprises the first resistance R1 and the second resistance R2 of series connection mutually, and the positive input terminal (16) of described comparator is connected between this first resistance R1 and the second resistance R2.
4. a kind of nitrogen oxide sensor ECU (Electrical Control Unit) self-recoverage height side overvoltage protective circuit as claimed in claim 2; it is characterized in that; described second dividing potential drop branch road comprises the 3rd resistance R3 and the 4th resistance R4 of series connection mutually, and the negative input end (15) of described comparator is connected between the 3rd resistance R3 and the 4th resistance R4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510222715.6A CN104901270A (en) | 2015-04-30 | 2015-04-30 | Self-recovery high side overvoltage protection circuit for electronic control unit of nitrogen oxygen sensor |
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| CN201510222715.6A CN104901270A (en) | 2015-04-30 | 2015-04-30 | Self-recovery high side overvoltage protection circuit for electronic control unit of nitrogen oxygen sensor |
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| CN104901270A true CN104901270A (en) | 2015-09-09 |
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| CN201510222715.6A Pending CN104901270A (en) | 2015-04-30 | 2015-04-30 | Self-recovery high side overvoltage protection circuit for electronic control unit of nitrogen oxygen sensor |
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| CN103457244A (en) * | 2013-08-27 | 2013-12-18 | 中国兵器工业集团第二一四研究所苏州研发中心 | DC/DC power protection circuit |
| CN104505807A (en) * | 2014-12-10 | 2015-04-08 | 无锡必创传感科技有限公司 | Automobile sensor protection circuit |
| CN204696651U (en) * | 2015-04-30 | 2015-10-07 | 武汉爱德威科技有限责任公司 | A kind of nitrogen oxide sensor ECU (Electrical Control Unit) self-recoverage height side overvoltage protective circuit |
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2015
- 2015-04-30 CN CN201510222715.6A patent/CN104901270A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040170031A1 (en) * | 2003-02-27 | 2004-09-02 | Canon Kabushiki Kaisha | AC/DC converter and power supply system using the same |
| CN201846058U (en) * | 2010-09-29 | 2011-05-25 | 厦门振泰成科技有限公司 | Over-voltage/over-current protecting circuit |
| CN202917954U (en) * | 2012-10-30 | 2013-05-01 | 佛山市顺德区瑞德电子实业有限公司 | Input under-voltage/ overvoltage protection circuit for invertion power supply |
| CN103457244A (en) * | 2013-08-27 | 2013-12-18 | 中国兵器工业集团第二一四研究所苏州研发中心 | DC/DC power protection circuit |
| CN104505807A (en) * | 2014-12-10 | 2015-04-08 | 无锡必创传感科技有限公司 | Automobile sensor protection circuit |
| CN204696651U (en) * | 2015-04-30 | 2015-10-07 | 武汉爱德威科技有限责任公司 | A kind of nitrogen oxide sensor ECU (Electrical Control Unit) self-recoverage height side overvoltage protective circuit |
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Effective date of registration: 20160229 Address after: 430000 Hubei Province, Wuhan city Optics Valley Road No. 303 core Center Industrial Park building 503 Wenxuan Applicant after: Hubei Dan Rui new material Science and Technology Ltd. Address before: 430212 Hubei city of Wuhan province and Jiangxia Economic Development Zone Avenue landscape Vista room 6 2-202 Applicant before: Wuhan Ai Dewei science and technology limited Company |
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