CN102116832B - Parameter tester for interference rejection circuit of vehicle power supply - Google Patents
Parameter tester for interference rejection circuit of vehicle power supply Download PDFInfo
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- CN102116832B CN102116832B CN 200910247762 CN200910247762A CN102116832B CN 102116832 B CN102116832 B CN 102116832B CN 200910247762 CN200910247762 CN 200910247762 CN 200910247762 A CN200910247762 A CN 200910247762A CN 102116832 B CN102116832 B CN 102116832B
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Abstract
本发明提供一种汽车电源干扰抑制电路的参数测试装置，属于汽车电子技术领域。本发明提高的测试装置包括用于过滤高频信号、消除振荡、吸收高压能量的第一电路模块以及用于控制频域特性、过滤干扰波形的第二电路模块，并可以通过两端开关和四端开关配合使用来选择工作模式，尤其适用于干扰多样性的汽车电源。因此，该测试装置具有通用性强、方便使用、测试效率高、测试准确的优点。
The invention provides a parameter testing device for an automobile power supply interference suppression circuit, which belongs to the technical field of automobile electronics. The improved test device of the present invention includes a first circuit module for filtering high-frequency signals, eliminating oscillations, and absorbing high-voltage energy, and a second circuit module for controlling frequency domain characteristics and filtering interference waveforms, and can pass two-terminal switches and four The terminal switch is used together to select the working mode, which is especially suitable for the automotive power supply with interference diversity. Therefore, the testing device has the advantages of strong versatility, convenient use, high testing efficiency and accurate testing.
Description
Technical field
The invention belongs to technical field of automotive electronics, be specifically related to a kind of parameter test device of automobile power source codan.
Background technology
Along with the development of automotive electronic technology, the automotive electronics associated circuitry becomes increasingly complex, and it is more and more important that its reliability of operation also becomes.Wherein, the control of the many critical components in the automobile is that the controller (ECU) with chip form is realized, for example, and the controller of the controller of its generator, the controller of engine, instrument etc.Controller normally places complicated automobile electronic system, accepts the power supply signal input from automobile power system.The common operating voltage of the controller of chip form lower and to the semaphore request of automobile power source than higher, when it places the power generating facilities and power grids of automobile, disturbed by the undesired signal of automobile power source and cause its inefficacy or output signal distortion.
Simultaneously, because the complicacy of automobile electronic system self can cause the power supply signal interference of automobile power source more, for example, because exposing, the energy of portfire causes existing in the automobile power source signal big pulse signal.Therefore, generally include various undesired signals (such as high pressure, high impulse sharp wave, high-frequency impulse etc.) in the automobile power source of controller.And the power supply that the common power supply of accepting of controller is a kind of signal specific form, for example, the automobile power source of the controller of engine is the pulse power of a kind of PWM of characteristic frequency (pulse-length modulation).The incidental undesired signal of automobile power source can cause controller to lose efficacy or the output signal distortion.
For solving this Problem of Failure, common two ends at controller automobile power source codan in parallel in the prior art is to realize the protection to controller.
Figure 1 shows that the principle schematic of the inhibition automobile power source interference of prior art.As shown in Figure 1,12 is controller, and 11 is the automobile power source codan, and the signal of automobile power source is imported controller 12 and automobile power source codan 11 simultaneously from the power supply signal input end.Automobile power source codan 11 comprises that electric capacity, resistance etc. are used for removing the components and parts of undesired signal, can remove undesired signals such as high-frequency signal, high-voltage pulse signal within the specific limits, thereby the power supply signal that controller 12 is received can not produce controller and destroy, and improves the reliability of automotive electronics greatly.
But, because the undesired signal of automobile power source is complicated and changeable, different vehicles, different running state of the vehicle etc. can produce different undesired signals, and the circuit parameter of power supply codan also needs change to suppress interference, for example parameter such as resistance sizes, capacitance size.Therefore, for reaching better protection effect, to the controller of the different critical components of different automobile types, the parameter of its corresponding automobile power source codan can be made respective design.This design need repeatedly be tested automobile power source in conjunction with the on-the-spot real-time motion of every kind of automobile usually, to draw the parameter of corresponding automobile power source codan.In the prior art, to the automobile power source test circuit (being the parameter test device of automobile power source codan) of different automobile types, different critical components overlap joint temporarily normally, time and effort consuming relatively, inefficiency, and do not have versatility.
In view of this, be necessary logical parameter test device for a kind of energy automobile power source codan general, that be convenient to test use.
Summary of the invention
The technical problem to be solved in the present invention is, at the parameter test device of a kind of energy of property complicated and changeable proposition of the interference of automobile power source automobile power source codan general, that be convenient to test use.
For solving above technical matters, the parameter test device of automobile power source codan, it comprises:
Be used for filtering first circuit module of high-frequency signal, oscillation-damped, absorption high-pressure energy;
The second circuit module of be used for the control frequency domain characteristic, filtering interference waveform;
Be used for selecting two end switch of first circuit module; And
Four end switch;
Described first circuit module is connected with parallel way with the second circuit module and places between automobile power source signal input part and the ground wire; First end of described four end switch connects the automobile power source signal input part, the output terminal of the second termination second circuit module of described four end switch, and the 3rd end of described four end switch is unsettled, the 4th end output signal of described four end switch.
Parameter test device according to automobile power source codan provided by the invention, wherein, described first circuit module comprises first variable capacitance and the Zener diode that is connected in parallel, described second circuit module comprises variable resistor and second variable capacitance that is connected in series, and the link of variable resistor and second variable capacitance is the output terminal of described second circuit module.
The parallel way connection simultaneously of first end of described variable-resistance first end, two end switch, first end of four end switch places the automobile power source signal input part, described Zener diode and the first variable capacitance parallel connection place between second end and ground of two end switch, the second end ground connection of the backward end of described Zener diode and described second variable capacitance.The 4th end of described four end switch outputs signal to controller.
Preferably, it is characterized in that, the capacitance of described second variable capacitance be first variable capacitance capacitance 10-100 doubly.
The capacitance scope of described second variable capacitance be 0.1 microfarad to 10 microfarads, the capacitance scope of described first variable capacitance is that 1 nanofarad is to 100 nanofarads.
Described variable-resistance Standard resistance range is 0.8 kilohm to 2 kilohms.
The breakdown reverse voltage scope of described Zener diode is the 20-100 volt.
According to the parameter test device of automobile power source codan provided by the invention, wherein, when first end of described two end switch disconnection, four end switch and the 4th end were closed, described proving installation worked in first kind of pattern; When the 3rd end of described two end switch disconnection, four end switch and the 4th end were closed, described proving installation worked in second kind of pattern; When the 3rd end of described two ends switch closure, four end switch and the 4th end were closed, described proving installation worked in the third pattern; When second end of described two end switch disconnection, four end switch and the 4th end were closed, described proving installation worked in the 4th kind of pattern; When first end of described two ends switch closure, four end switch and the 4th end were closed, described proving installation worked in the 5th kind of pattern; When second end of described two ends switch closure, four end switch and the 4th end were closed, described proving installation worked in the 6th kind of pattern.
Technique effect of the present invention is, the parameter test device of the automobile power source codan of this invention can various modes incision transformation change and device parameters adjustable, can change circuit-mode flexibly according to the demonstration result of output signal with the test circuit parameter; It does not need to change the circuit board of proving installation, does not more need to change the mould of relevant critical component etc.; It can be overlapped in outside the body of a motor car simultaneously, does not need to consider the assembly problem of proving installation and automobile substantially.Therefore, this proving installation has highly versatile, convenient use, testing efficiency height, tests advantage accurately.
Description of drawings
Fig. 1 is the principle schematic that the inhibition automobile power source of prior art disturbs;
Fig. 2 is the electrical block diagram according to the parameter test device of the automobile power source codan of an embodiment provided by the invention;
Fig. 3 is the schematic equivalent circuit according to first kind of mode of operation of proving installation embodiment illustrated in fig. 2 provided by the invention;
Fig. 4 is the schematic equivalent circuit according to second kind of mode of operation of proving installation embodiment illustrated in fig. 2 provided by the invention;
Fig. 5 is the schematic equivalent circuit according to the third mode of operation of proving installation embodiment illustrated in fig. 2 provided by the invention;
Fig. 6 is the 4th kind of mode of operation according to proving installation embodiment illustrated in fig. 2 provided by the invention;
Fig. 7 is the schematic equivalent circuit according to the 5th kind of mode of operation of proving installation embodiment illustrated in fig. 2 provided by the invention;
Fig. 8 is the schematic equivalent circuit according to the 6th kind of mode of operation of proving installation embodiment illustrated in fig. 2 provided by the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Among the present invention the automobile power source codan of indication refer to be similar to that background technology is described, the undesired signal that is used for removing automobile power source, avoid controller be subjected to automobile power source disturb destroy or the circuit of output distortion.Generally speaking, the automobile power source codan comprises for the resistance of filtering and electric capacity etc., " parameter " of automobile power source codan mainly is the particular circuit configurations parameter in the power supply codan, for example, the direction voltage breakdown of resistance value size, capacitance size, Zener diode.
Figure 2 shows that the electrical block diagram according to the parameter test device of the automobile power source codan of an embodiment provided by the invention.This proving installation places between controller 12 and the automobile power source, as shown in Figure 2, the parameter test device of automobile power source codan exports controller 12 to by four end switch 240 then from the power supply signal of the outside automobile electrical network of automobile power source signal input part reception.In this embodiment, the parameter test device of automobile power source codan comprises two end switch 230, four end switch 240, Zener diode (Zener Diode) 211, first variable capacitance 212, variable resistor 221 and second variable capacitance 222.The a end of two end switch 230, No. 1 end of four end switch 240, the first termination automobile power source signal input part of variable resistor 221, Zener diode 211 and first variable capacitance 212 are connected in parallel in the b end of two end switch 230, wherein forward termination two ends switch, the backward end ground connection of Zener diode, the other end ground connection of first variable capacitance 211.Second variable capacitance 222 is connected with variable resistor 221 and is formed the RC circuit, wherein, and second end of the first termination variable capacitance resistance 221 of second variable capacitance 222, the second end ground connection of second variable capacitance 222.Switchblade knife one end of four end switch 240 is fixed in the 4th end, the other end can place No. 1, No. 2 or No. 3 ends, and wherein No. 3 ends are put sky.No. 2 ends are connected in first end (also being second end that resistance 221 is held in power transformation) of electric capacity 222.
See also Fig. 2, in this embodiment, because the complicacy of automobile electronic system self can cause having various interference in the power supply signal of automobile power source.In the automobile electrical network during to the power supply of the controller of each critical component, mainly there are undesired signals (" high frequency " described here, " high pressure " are at the frequency of the needed normal power source signal of controller itself, power supply) such as high-frequency signal, oscillator signal, high-voltage signal, simultaneously, for different vehicles, different critical components, the undesired signal in the automobile power source signal that its electrical network provides is difference to some extent also.Output signal for automobile power source is unmanageable, so we can regard automobile power source as one " black box ", and it may export various interference waveforms.For the controller to each critical component of each vehicle adds a relative accurate protection circuit (being the automobile power source codan); need to use the proving installation of this embodiment to measure the parameter of holding circuit; for example resistance sizes, capacitance size, thus can reach best protection effect and realize the simplification of holding circuit.
Continue to see also Fig. 2, when using the controller 12 of this proving installation to critical component and carry out the parameter testing of automobile power source codan, the automobile power source signal can be imported from input end, extremely holds through two end switch 230, in parallel first variable capacitance 212 and Zener diode 211 back then.When two end switch 230 were connected, first variable capacitance 212 can be used for the high-frequency signal in the automobile power source signal is filtered, and Zener diode 211 can be used for oscillator signal, high-voltage signal etc. is filtered, thereby absorbs redundant electric energy by the ground end.In this embodiment, Zener diode 211 and first variable capacitance 212 of parallel connection is defined as first circuit module 210, can realizes filtering high-frequency signal, oscillation-damped, absorption high-pressure energy by first circuit module 210 is set in this proving installation.Particularly, the frequency range of the high-frequency signal that filters is determined by the size of first variable capacitance 212, the hunting range of eliminating, the high-pressure energy that absorbs are determined by the breakdown reverse voltage of Zener diode 211, in this embodiment, the breakdown reverse voltage scope of Zener diode is the 20-100 volt, and the capacitance scope of first variable capacitance is that 1nF is to 100nF (nanofarad).For example, when the breakdown reverse voltage of Zener diode 211 was 40V, if the high-voltage signal in the undesired signal or vibration during greater than 40V, diode 211 was reversed puncture, thereby can filter high-voltage signal or vibration greater than 40V.The breakdown reverse voltage scope of Zener diode, the capacitance scope of first variable capacitance are not limited by embodiment of the present invention, and those skilled in the art can wait to determine scope according to the empirical data of the automobile power source of vehicle, the power source performance requirement of controller.
Continue to see also Fig. 2, the automobile power source signal can input to variable resistor 221, second variable capacitance 222 from input end and hold then extremely, in this embodiment, the RC circuit that variable resistor 221 and second variable capacitance 222 are formed is defined as second circuit module 220, this second circuit module 220 also can realize filtering the effect of interference waveform, control frequency domain characteristic by electric capacity, and its concrete waveform that filters and the frequency domain characteristic of controlling are influenced by the resistance value size of variable resistor 221 and the capacitance size of second variable capacitance 222.The link of second variable capacitance 222 and variable resistor 221 is defined as the output terminal of second circuit module 220, variable-resistance No. 2 ends of output termination four ends of second circuit module 220.In this embodiment, the capacitance size scope of second variable capacitance 222 be 0.1 microfarad to 10 microfarads, the resistance value magnitude range of variable resistor 221 is 0.8 kilo-ohm to 2 kilo-ohms.The resistance value magnitude range of variable resistor 221, the capacitance scope of second variable capacitance are not limited by embodiment of the present invention, and those skilled in the art can wait to determine scope according to the empirical data of the automobile power source of vehicle, the power source performance requirement of controller.
Because the difference of factors such as vehicle, critical component; therefore the different elements that needs to make up in this proving installation in the parameter testing process in conjunction with automobile carries out the test of certain sequencing; drawing the circuit parameter of the holding circuit that is matched with the controller of being protected, thereby can instruct the optimal design to the holding circuit of each vehicle, each critical component.Can make up six kinds of test circuits of realization by two end switch 230 and four end switch 240, simultaneously, variable resistor, variable capacitance also are to regulate within the specific limits, therefore can realize various automobile power source signal is tested.Describe below in conjunction with the principle of work of concrete method of testing process to the proving installation of this invention.
The S110 step disconnects (S2 state) with two end switch 230, No. 1 end and No. 4 end short circuits (K1 state) of four end switch 240.
At this moment, proving installation works in first kind of pattern, Figure 3 shows that the schematic equivalent circuit according to first kind of mode of operation of proving installation embodiment illustrated in fig. 2 provided by the invention.As shown in Figure 3, under this pattern, first circuit module 210 can be left in the basket, and the automobile power source signal is directly inputted into controller 12, the signal of controller 12 outputs is measured by external oscillograph, and the output signal of controller 12 is exported by MOSFET usually.The controller that with the controller is the control motor is example, and just often, it exports PWM (pulse-length modulation) ripple of certain waveform or frequency with the rotation of control motor.If this moment, the PWM waveform of output was normal, represent that then the automobile power source signal quality meets the requirements substantially, this critical component to this vehicle can not arrange the automobile power source codan, and the parameter that also can be understood as the automobile power source codan all is set to " 0 ".If the waveform distortion of controller output or not output represent that then the automobile power source signal quality is undesirable, need the automobile power source codan be set to controller, therefore need carry out the parameter of pacing examination automobile power source codan.
The S120 step disconnects two end switch 230 or closure, No. 3 ends and No. 4 end short circuits (K2 state) of four end switch 240.
At this moment, proving installation works in second kind of pattern or the third pattern, Figure 4 shows that according to the schematic equivalent circuit of second kind of mode of operation of proving installation embodiment illustrated in fig. 2 provided by the invention, Figure 5 shows that the schematic equivalent circuit according to the third mode of operation of proving installation embodiment illustrated in fig. 2 provided by the invention.As Fig. 4, shown in Figure 5, under this pattern, the output terminal of proving installation is by unsettled, so the input of the power supply of first circuit module 210 and 220 pairs of controllers of second circuit module is not influence, therefore, second kind of pattern and the third pattern are basic equivalences.By the direct input signal of testing automobile power input of this step, if input signal is normal substantially, be that state no interference signal or undesired signal are smaller, the result that then can show " waveform distortion of controller output or not have output " in the previous step is likely because controller self damage or controller itself cause the self reasons such as influence of automobile electrical network, thereby determined the key point of problem.
The S130 step disconnects (S2 state) with two end switch 230, No. 2 ends and No. 4 end short circuits (K3 state) of four end switch 240.
At this moment, proving installation works in the 4th kind of pattern, Figure 6 shows that the schematic equivalent circuit according to the 4th kind of mode of operation of proving installation embodiment illustrated in fig. 2 provided by the invention.Under this pattern, first circuit module 210 is left in the basket, the automobile power source signal is undertaken by the second circuit module that waveform filters and frequency domain characteristic control, and the automobile power source signal can export controller 12 to after by variable resistor 221, and the output signal of controller 12 is monitored by oscillograph in real time at this moment.In this S130 step, for whether test can only realize disturbing by second circuit module 220 suppress, can comprise two steps.
First step can calculate preferable value of setting of variable resistor, second variable capacitance by theory, thereby variable resistor, second variable capacitance are arranged on this calculated value realization " coarse adjustment " process; If this moment controller undesirable, the distortion of output signal or do not have, then representative also needs to continue test parameter.
Second step; regulate second variable capacitance 222 and variable resistor 221 by fine motion; for example variable resistor is fixed; regulate second variable capacitance, 222 sizes; if the output waveform of controller reaches target call; then show in the automobile power source codan of this controller and can be designed as circuitous pattern shown in Figure 6; its resistance; the parameter of electric capacity can respective design be variable resistor 221 this moment; the size of second variable capacitance 222; thereby can realize with the simplest; the most accurate circuit is realized the protection to controller; reduce the cost of automobile power source codan, improve the protection effect.If, the output waveform of controller does not reach target call yet, then show undesired signals such as existence is bigger in the automobile power source oscillator signal, high-voltage signal, high-frequency signal, need further to test by increasing by first circuit module, the tester also thus the S130 step have one to understand qualitatively to the input signal of automobile power source, can instruct next step debugging.
The S140a step, with two end switch, 230 closures (S1 state), No. 1 end and No. 4 end short circuits (K1 state) of four end switch 240.
At this moment, proving installation works in the 5th kind of pattern, Figure 7 shows that the schematic equivalent circuit according to the 5th kind of mode of operation of proving installation embodiment illustrated in fig. 2 provided by the invention.As shown in Figure 7, under this pattern, first circuit module 210 and the parallel connection of second circuit module place between automobile power source signal input part and the ground, in this embodiment, because the capacitance of first variable capacitance much smaller than the capacitance of second variable capacitance, therefore can be ignored 220 pairs of second circuit modules at this and suppress the effect that automobile power source disturbs.If the breakdown reverse voltage of the Zener diode 211 that oppositely arranges with respect to the automobile power source input signal is the Vbd volt, the electric signal greater than the Vbd volt will be filtered when automotive ignition or throw load (for example high back electromotive force) via Zener diode 211 with inputing in the automobile power source input signal so; In like manner, the above high-frequency signal of certain frequency also can be inputed to ground by first variable capacitance 212 and filter out.In this step process, can regulate the capacitance of first variable capacitance 212, up to reaching best high frequency filter effect, for example, first theory calculates desired value and instructs realization coarse adjustment process, finishes with the fine tuning process; The selection of Zener diode 211 can be determined according to the ceiling voltage of the required desirable input power supply of controller, and for example can select breakdown reverse voltage is the ceiling voltage of desirable input power supply or than the high a little 1-5 volt of ceiling voltage.When the output waveform of oscillograph display controller 12 just often, the automobile power source codan can be made parameter designing with the size of first variable capacitance this moment, this moment Zener diode model of being used.
The S140b step, with two end switch, 230 closures (S1 state), No. 2 ends and No. 4 end short circuits (K3 state) of four end switch 240.
At this moment, proving installation works in the 6th kind of pattern, Figure 8 shows that the schematic equivalent circuit according to the 6th kind of mode of operation of proving installation embodiment illustrated in fig. 2 provided by the invention.As shown in Figure 8, under this pattern, first circuit module 210 and second circuit module 220 all play a role, therefore can carry out high-frequency signal by the automobile power source of regulating first variable capacitance 212, second variable capacitance 222,221 pairs of inputs of variable resistor regulates, to realize effects such as high-frequency signal filters, vibration elimination, high-pressure energy absorption, frequency domain characteristic control, waveform filtration, in the adjustment process, observe the output waveform of controller 12 to find out its best output effect.The size of first variable capacitance when the automobile power source codan can be with best output effect, the Zener diode model of being used, the size of second variable capacitance, variable-resistance size are used as the parameter designing of automobile power source codan.Above adjustment process also can combine with " coarse adjustment " and " fine tuning " process and finish.
Need to prove that above S140a and S140b are coordinations, namely after the S130 step, according to test result, both can select to carry out earlier the S140a step, also can select to carry out earlier the S140b step." connection " that reach described in this invention all refers to " electric connection ".
From the above, the multimodal design of the parameter test device of the automobile power source codan of this invention can change circuit-mode flexibly according to the demonstration result of output signal, do not need to change the circuit board of proving installation, more do not need to change the mould of relevant critical component etc.Because it can be overlapped in outside the body of a motor car, does not need to consider the assembly problem of proving installation and automobile substantially.Therefore, this proving installation has highly versatile, the convenient advantage of using, and higher, the test of the efficient the during parameter of testing automobile power supply codan simultaneously accurately.
Under situation without departing from the spirit and scope of the present invention, can also constitute many very embodiment of big difference that have.Should be appreciated that except as defined by the appended claims, the invention is not restricted at the specific embodiment described in the instructions.
Claims (13)
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| CN 200910247762 CN102116832B (en) | 2009-12-30 | 2009-12-30 | Parameter tester for interference rejection circuit of vehicle power supply |
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| CN 200910247762 CN102116832B (en) | 2009-12-30 | 2009-12-30 | Parameter tester for interference rejection circuit of vehicle power supply |
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| CN102116832B true CN102116832B (en) | 2013-08-14 |
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| CN102759703B (en) * | 2012-07-11 | 2015-03-04 | 深圳珈伟光伏照明股份有限公司 | Testing method and related device for reliability of circuit |
| CN104716947B (en) * | 2013-12-13 | 2023-05-02 | 上海普锐马电子有限公司 | Coupling circuit for pulse generator and tested equipment power supply |
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| CN2049426U (en) * | 1989-07-20 | 1989-12-13 | 许伦 | Microcomputer power supply protective device |
| CN1274834A (en) * | 1999-05-24 | 2000-11-29 | 湖南计算机股份有限公司 | Sensor signal processing circuit |
| US7239497B2 (en) * | 2002-01-02 | 2007-07-03 | Ruggedcom Inc. | Environmentally hardened Ethernet switch |
| CN201247955Y (en) * | 2008-08-26 | 2009-05-27 | 四川登巅微电子有限公司 | Direct-current power supply filter circuit capable of restraining power-supply interference |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH10227820A (en) * | 1997-02-12 | 1998-08-25 | Nippon Telegr & Teleph Corp <Ntt> | Sensor time response correction method and sensor time response correction device |
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|---|---|---|---|---|
| CN2049426U (en) * | 1989-07-20 | 1989-12-13 | 许伦 | Microcomputer power supply protective device |
| CN1274834A (en) * | 1999-05-24 | 2000-11-29 | 湖南计算机股份有限公司 | Sensor signal processing circuit |
| US7239497B2 (en) * | 2002-01-02 | 2007-07-03 | Ruggedcom Inc. | Environmentally hardened Ethernet switch |
| CN201247955Y (en) * | 2008-08-26 | 2009-05-27 | 四川登巅微电子有限公司 | Direct-current power supply filter circuit capable of restraining power-supply interference |
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| JP特开平10-227820A 1998.08.25 |
| 张信高.显示器开关式稳压电源与抗干扰电路设计.《能源与环境》.2005,(第4期),30-32. |
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