CN207937828U - A kind of analog-to-digital conversion observation circuit and electronic controller - Google Patents
A kind of analog-to-digital conversion observation circuit and electronic controller Download PDFInfo
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- CN207937828U CN207937828U CN201820468074.1U CN201820468074U CN207937828U CN 207937828 U CN207937828 U CN 207937828U CN 201820468074 U CN201820468074 U CN 201820468074U CN 207937828 U CN207937828 U CN 207937828U
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Abstract
The utility model discloses a kind of analog-to-digital conversion observation circuit and electronic controllers.The analog-to-digital conversion observation circuit includes：Reference power source, monitoring unit, AD conversion unit and micro-control unit, the output end of reference power source are electrically connected with the reference signal end of AD conversion unit；The input terminal of monitoring unit is electrically connected with the first output end of micro-control unit, output end is electrically connected with the first input end of AD conversion unit, monitoring unit is used to receive the monitoring signals of micro-control unit output, monitoring signals are converted into simulation monitoring signals, and simulation monitoring signals are sent to AD conversion unit；AD conversion unit is converted to the first digital signal for that will simulate monitoring signals, and the first digital signal is sent to micro-control unit；Micro-control unit is for comparing the first digital signal and theoretical digital signal corresponding with monitoring signals, to monitor the working condition of AD conversion unit.The utility model provides a kind of analog-to-digital conversion monitoring scheme of inexpensive and gamut monitoring.
Description
Technical field
The utility model is related to element function monitoring field more particularly to a kind of analog-to-digital conversion observation circuit and electronic controls
Device.
Background technology
In existing automobile electronic controller, the acquisition much to analog quantity can be related to, the acquisition scheme of current main-stream is equal
To convert analog quantity to digital quantity, then handled by the control chip in automobile electronic controller.Currently for simulation
To digital quantity convert mode in using control chip interior integrate AD conversion unit or external AD conversion unit come
It realizes.Analog quantity is compared by AD conversion unit with reference source, and analog quantity is converted to digital quantity using specific algorithm.
However, current overwhelming majority automobile electronic controller all adopts AD conversion unit without monitoring or minority
The reference source of AD conversion unit is monitored with other high-precision reference source, but cost is very high, and high-precision
Reference source generally also only has a kind of reference voltage, cannot be satisfied to the monitoring in AD conversion unit gamut scope, works as modulus
The transfer process of converting unit when something goes wrong, can not judge whether collected analog quantity goes wrong.
Utility model content
A kind of analog-to-digital conversion observation circuit of the utility model offer and electronic controller, to provide a kind of inexpensive and full dose
The analog-to-digital conversion monitoring scheme of journey monitoring.
In a first aspect, the utility model provides a kind of analog-to-digital conversion observation circuit, which includes：
Reference power source, monitoring unit, AD conversion unit and micro-control unit；Wherein,
The output end of the reference power source is electrically connected with the reference signal end of the AD conversion unit；
The input terminal of the monitoring unit is electrically connected with the first output end of the micro-control unit, output end and the mould
The first input end electrical connection of number converting unit, the monitoring unit are used to receive the monitoring letter of the micro-control unit output
Number, the monitoring signals are converted into simulation monitoring signals, and the simulation monitoring signals are sent to the analog-to-digital conversion list
Member；
The output end of the AD conversion unit is electrically connected with the input terminal of the micro-control unit；The analog-to-digital conversion list
First digital signal is sent to the micro-control by member for the simulation monitoring signals to be converted to the first digital signal
Unit processed；
The micro-control unit is for first digital signal and theoretical number corresponding with the monitoring signals
Signal, to monitor the working condition of the AD conversion unit.
Further, the monitoring signals are that pulse width modulates (Pulse Width Modulation, PWM) signal.
Further, the monitoring unit is low-pass filter.
Further, the monitoring unit includes first resistor, second resistance, 3rd resistor, the first capacitance, the second capacitance
With third capacitance；Wherein,
The first end of the first resistor is electrically connected with the first output end of the micro-control unit, second end respectively with institute
State the first end electrical connection of the first end and second resistance of the first capacitance；
The second end of the second resistance respectively with the first end of second capacitance and the 3rd resistor first
End electrical connection；
The second end of the 3rd resistor respectively with the first end of the third capacitance and the AD conversion unit
First input end is electrically connected；
The second end of the second end of first capacitance, the second end of second capacitance and the third capacitance with
Ground terminal is electrically connected.
Further, the monitoring unit includes the first inductance, the second inductance, the 4th capacitance and the 5th capacitance；Wherein,
The first end of first inductance is electrically connected with the first output end of the micro-control unit, second end respectively with institute
State the first end of the 4th capacitance and the first end electrical connection of the second inductance；
The second end of second inductance respectively with the first end of the 5th capacitance and the AD conversion unit
First input end is electrically connected；
The second end of 4th capacitance is electrically connected with the second end of the 5th capacitance and ground terminal respectively.
Further, the monitoring unit is D/A conversion unit.
Second aspect, the utility model additionally provide a kind of electronic controller, which includes the utility model
The analog-to-digital conversion observation circuit that any embodiment provides.
In the utility model, monitoring unit by the monitoring signals that micro-control unit is sent be converted to simulation monitoring signals it is concurrent
It is sent to AD conversion unit, the first digital signal is converted to by AD conversion unit, micro-control unit is by comparing the first number
Signal and theoretical digital signal, judge whether the transformation result of AD conversion unit is correct, to monitor AD conversion unit
Whether working condition is abnormal, simple in structure to be easy to real since monitoring unit is only used for monitoring signals being converted to analog signal
It is existing and at low cost, and by the size of micro-control unit controls monitoring signals, the full dose to AD conversion unit may be implemented
Journey range monitors.
Description of the drawings
Fig. 1 is a kind of schematic diagram for analog-to-digital conversion observation circuit that the utility model embodiment provides；
Fig. 2 is the schematic diagram for another analog-to-digital conversion observation circuit that the utility model embodiment provides；
Fig. 3 is the schematic diagram for another analog-to-digital conversion observation circuit that the utility model embodiment provides；
Fig. 4 is the schematic diagram for another analog-to-digital conversion observation circuit that the utility model embodiment provides；
Fig. 5 is a kind of schematic diagram for electronic controller that the utility model embodiment provides.
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, it illustrates only for ease of description, in attached drawing and the relevant part of the utility model rather than entire infrastructure.
A kind of analog-to-digital conversion observation circuit is present embodiments provided, Fig. 1 is a kind of mould that the utility model embodiment provides
The schematic diagram of number conversion observation circuit, with reference to figure 1, which includes：Reference power source 110, monitoring unit
120, AD conversion unit 130 and micro-control unit 140；Wherein,
The output end of reference power source 110 is electrically connected with the reference signal end of AD conversion unit 130；
The input terminal of monitoring unit 120 is electrically connected with the first output end of micro-control unit 140, output end and analog-to-digital conversion
The first input end of unit 130 is electrically connected, and monitoring unit 120 is used to receive the monitoring signals of the output of micro-control unit 140, will supervise
It surveys signal and is converted to simulation monitoring signals, and simulation monitoring signals are sent to AD conversion unit 130；
The output end of AD conversion unit 130 is electrically connected with the input terminal of micro-control unit 140；AD conversion unit 130
The first digital signal is converted to for monitoring signals will to be simulated, and the first digital signal is sent to micro-control unit 140；
Micro-control unit 140 is for comparing the first digital signal and theoretical digital signal corresponding with monitoring signals, with prison
Survey the working condition of AD conversion unit 130.
Wherein, reference power source 110 is that AD conversion unit 130 provides reference voltage, and mould is realized for AD conversion unit 130
Quasi- number transformation function.AD conversion unit 130 can be the analog-to-digital conversion module built in micro-control unit 140, can also be
Independently of the modulus conversion chip except micro-control unit 140, the present embodiment does not limit this.Micro-control unit 140 can be with
For microcontroller, Digital Signal Processing (Digital Signal Processing, DSP) chip or field programmable gate array
(Field-Programmable Gate Array, FPGA) chip etc..Monitoring signals are digital signal.
In the present embodiment, the monitoring signals that micro-control unit is sent are converted to simulation monitoring signals and sent by monitoring unit
To AD conversion unit, the first digital signal is converted to by AD conversion unit, micro-control unit is believed by comparing the first number
Number and theoretical digital signal, judge whether the transformation result of AD conversion unit correct, to monitor the work of AD conversion unit
Whether abnormal make state, it is simple in structure to be easily achieved since monitoring unit is only used for monitoring signals being converted to analog signal
And it is at low cost, and by the size of micro-control unit controls monitoring signals, the gamut to AD conversion unit may be implemented
Range monitors.
Optionally, it continues to refer to figure 1, micro-control unit 140 is additionally operable to when the first digital signal and theoretical digital signal
When difference is more than the first predetermined threshold value, 130 operation irregularity of AD conversion unit is determined.
Wherein, the first predetermined threshold value can be set according to the conversion accuracy of AD conversion unit 130, and the present embodiment is not
It is specifically limited.
Optionally, monitoring signals are pwm signal.
Specifically, since pwm signal by simply filtering can be exchanged into analog signal, the present embodiment, which passes through, is arranged prison
Survey signal be pwm signal so that the structure of monitoring unit 120 more it is simple easily realization, further reduced observation circuit at
This.
Optionally, monitoring unit 120 is low-pass filter.
Specifically, monitoring unit 120 can be one or more levels RC low-pass filter, or LC low-pass filters or
Other low-pass filters.
Fig. 2 is the schematic diagram for another analog-to-digital conversion observation circuit that the utility model embodiment provides, optionally, reference
Fig. 2, monitoring unit 120 include the first inductance L1, the second inductance L2, the 4th capacitance C4 and the 5th capacitance C5；Wherein,
The first end of first inductance L1 is electrically connected with the first output end of micro-control unit 140, and second end is respectively with the 4th
The first end of capacitance C4 and the electrical connection of the first end of the second inductance L2；
The second end of second inductance L2 is defeated with the first of the first end of the 5th capacitance C5 and AD conversion unit 130 respectively
Enter end electrical connection；
The second end of 4th capacitance C4 and the second end of the 5th capacitance C5 are electrically connected with ground terminal respectively.
Wherein, the first inductance L1 and the 4th capacitance C4, the second inductance L2 and the 5th capacitance C5 respectively constitute level-one LC low passes
Filter, the monitoring unit 120 of the present embodiment is realized using two-stage LC low-pass filters is filtered into direct current signal by pwm signal,
Relative to one or more levels LC low-pass filter is used, filtering speed is very fast, that is, meets required precision, in turn ensures circuit
With higher dynamic responding speed and lower cost.
Fig. 3 is the schematic diagram for another analog-to-digital conversion observation circuit that the utility model embodiment provides, optionally, reference
Fig. 3, monitoring unit 120 include first resistor R1, second resistance R2,3rd resistor R3, the first capacitance C1, the second capacitance C2 and the
Three capacitance C3；Wherein,
The first end of first resistor R1 is electrically connected with the first output end of micro-control unit 140, and second end is respectively with first
The first end of capacitance C1 and the first end electrical connection of second resistance R2；
First end of the second end of second resistance R2 respectively with the first end of the second capacitance C2 and 3rd resistor R3 is electrically connected
It connects；
The second end of 3rd resistor R3 is defeated with the first of the first end of third capacitance C3 and AD conversion unit 130 respectively
Enter end electrical connection；
The second end of the second end of first capacitance C1, the second end of the second capacitance C2 and third capacitance C3 is electric with ground terminal
Connection.
Wherein, first resistor R1 and the first capacitance C1, second resistance R2 and the second capacitance C2,3rd resistor R3 and third electricity
Hold C3 and respectively constitute level-one RC low-pass filters, the monitoring unit 120 of the present embodiment is realized using three-level RC low-pass filters will
Pwm signal is filtered into direct current signal.Relative to level-one or two-stage RC low-pass filters is used, filtering speed is very fast, that is, meets
Required precision in turn ensures that circuit has higher dynamic responding speed.Relative to LC low-pass filter structures are used, using three
Grade RC filters, further reduce costs, and resistance device reduces observation circuit occupancy relative to inductance small volume
Area.
Fig. 4 is the schematic diagram for another analog-to-digital conversion observation circuit that the utility model embodiment provides, optionally, reference
Fig. 4, monitoring unit 120 can also be D/A conversion unit.Monitoring signals can be converted directly into simulation by D/A conversion unit
Amount, the requirement to monitoring signals are relatively low.
Optionally, micro-control unit 140 is additionally operable to the comparison result tune according to the first digital signal and theoretical digital signal
The duty ratio of whole pwm signal.
Specifically, when normal work, micro-control unit 140 can generate the pwm signal of different duty, such as 90% duty
The pwm signal of ratio, if the pwm signal high level that micro-control unit 140 exports is+5V, low level is 0V, passes through three-level RC low passes
After filter, the simulation monitoring signals be converted to are 5V*90%=4.5V, and AD conversion unit 130 monitors the simulation of 4.5V
Signal carries out simulation numeral conversion, obtains the first digital signal, micro-control unit 140 compares the first digital signal and the mould of 4.5V
Intend the corresponding theoretical digital signal of monitoring signals, if the difference of the two is less than or equal to the first predetermined threshold value, transformation result is accurate
Really, AD conversion unit 130 works normally, and reference power source 110 is without exception.
If the two difference is more than the first predetermined threshold value, transformation result is inaccurate, 130 operation irregularity of AD conversion unit,
Then micro-control unit 140 exports the pwm signal of new duty ratio, such as the pwm signal of 80% duty ratio, passes through three-level RC low pass filtereds
After wave device, the simulation monitoring signals be converted to are 5V*80%=4V, continue to monitor the simulation of 4V by AD conversion unit 130
Signal carries out simulation numeral conversion, and micro-control unit 140 continues to judge whether transformation result is accurate.If transformation result is accurate,
It is abnormal to think that ADC works in 4.25V~4.75V or so range sections.If transformation result is still inaccurate at this time, microcontroller list
Member 140 continues to change the duty ratio of pwm signal, until 10% duty ratio, can monitor modulus in gamut scope in this way and turn
Whether abnormal change the work of unit 130.
If transformation result is inaccurate in 130 gamut scope of AD conversion unit, it is judged as that reference power source 110 works
Abnormal, if the transformation result only in the range ability of part of AD conversion unit 130 is inaccurate, micro-control unit 140 is further according to this
The pwm signal of part range output duty cycle stepping, such as 1% stepping, the work for judging AD conversion unit 130 that can be finer
Make state.
Optionally, micro-control unit 140 is additionally operable to when the working condition exception of AD conversion unit 130, exports alarm
Signal.
Specifically, if micro-control unit 140 can be able to be microcontroller with user interface direct communication, the alarm signal
The display signal that unit 140 exports directly shows 130 exception information of AD conversion unit in user interface.If micro-control unit
140 can not be with user interface direct communication, then micro-control unit 140 can be with the controller of user's direct communication to other
Alarm signal is sent, with by 130 operation irregularity of controller prompt user AD conversion unit.
The present embodiment additionally provides a kind of electronic controller, which includes the utility model any embodiment institute
The analog-to-digital conversion observation circuit stated.The electronic controller is set in the equipment such as automobile, illustratively, the electronic controller
It can be automobile electronic controller.
Fig. 5 is a kind of schematic diagram for electronic controller that the utility model embodiment provides, optionally, with reference to figure 5, the electricity
Sub-controller further includes：
The input terminal of main control unit 210, main control unit 210 is electrically connected with the second output terminal of micro-control unit 140；
Micro-control unit 140 is additionally operable to when the working condition exception of AD conversion unit 130, and alarm is sent to main control unit 210
Signal.
Specifically, main control unit 210 is the control unit with user interface direct communication, micro-control unit 140 passes through
Alarm signal is sent to main control unit 210, to prompt 130 operation irregularity of user's AD conversion unit by main control unit 210.
Optionally, with reference to figure 5, which further includes signal gathering unit 220, for acquiring the equipment such as automobile fortune
Operating parameter during row.Specifically, the second input of the output end of signal gathering unit 220 and AD conversion unit 130
End electrical connection.After signal gathering unit 220 collects operating parameter, AD conversion unit 130 is sent it to, by analog-to-digital conversion
Unit 130, which is converted to, to be sent to micro-control unit 140 after digital quantity and is handled.
The gamut to AD conversion unit may be implemented in analog-to-digital conversion observation circuit in the electronic controller of the present embodiment
Range monitors, it can be ensured that the transformation result of the operating parameter of acquisition is accurate, so as to accurately judge operating parameter
It is whether abnormal.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, can carry out for a person skilled in the art various bright
Aobvious variation is readjusted, be combined with each other and is substituted without departing from the scope of protection of the utility model.Therefore, although passing through
Above example is described in further detail the utility model, but the utility model is not limited only to the above implementation
Example can also include other more equivalent embodiments in the case where not departing from the utility model design, and the utility model
Range is determined by scope of the appended claims.
Claims (7)
1. a kind of analog-to-digital conversion observation circuit, which is characterized in that including：
Reference power source, monitoring unit, AD conversion unit and micro-control unit；Wherein,
The output end of the reference power source is electrically connected with the reference signal end of the AD conversion unit；
The input terminal of the monitoring unit is electrically connected with the first output end of the micro-control unit, and output end turns with the modulus
The first input end electrical connection of unit is changed, the monitoring unit is used to receive the monitoring signals of the micro-control unit output, will
The monitoring signals are converted to simulation monitoring signals, and the simulation monitoring signals are sent to the AD conversion unit；
The output end of the AD conversion unit is electrically connected with the input terminal of the micro-control unit；The AD conversion unit is used
In the simulation monitoring signals are converted to the first digital signal, and first digital signal is sent to the microcontroller list
Member；
The micro-control unit is used for first digital signal and theoretical digital signal corresponding with the monitoring signals,
To monitor the working condition of the AD conversion unit.
2. circuit according to claim 1, it is characterised in that：
The monitoring signals are pulse width modulation (PWM) signal.
3. circuit according to claim 2, it is characterised in that：
The monitoring unit is low-pass filter.
4. circuit according to claim 3, it is characterised in that：
The monitoring unit includes first resistor, second resistance, 3rd resistor, the first capacitance, the second capacitance and third capacitance；Its
In,
The first end of the first resistor is electrically connected with the first output end of the micro-control unit, and second end is respectively with described
The first end electrical connection of the first end and second resistance of one capacitance；
The second end of the second resistance is electric with the first end of the first end of second capacitance and the 3rd resistor respectively
Connection；
The second end of the 3rd resistor respectively with the first end of the third capacitance and the AD conversion unit first
Input terminal is electrically connected；
The second end of the second end of first capacitance, the second end of second capacitance and the third capacitance is and ground terminal
Electrical connection.
5. circuit according to claim 3, it is characterised in that：
The monitoring unit includes the first inductance, the second inductance, the 4th capacitance and the 5th capacitance；Wherein,
The first end of first inductance is electrically connected with the first output end of the micro-control unit, and second end is respectively with described
The first end of four capacitances and the electrical connection of the first end of the second inductance；
The second end of second inductance respectively with the first end of the 5th capacitance and the AD conversion unit first
Input terminal is electrically connected；
The second end of 4th capacitance is electrically connected with the second end of the 5th capacitance and ground terminal respectively.
6. circuit according to claim 1, it is characterised in that：
The monitoring unit is D/A conversion unit.
7. a kind of electronic controller, which is characterized in that including claim 1-6 any one of them analog-to-digital conversion observation circuits.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820468074.1U CN207937828U (en) | 2018-03-30 | 2018-03-30 | A kind of analog-to-digital conversion observation circuit and electronic controller |
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| CN201820468074.1U CN207937828U (en) | 2018-03-30 | 2018-03-30 | A kind of analog-to-digital conversion observation circuit and electronic controller |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387777A (en) * | 2018-11-09 | 2019-02-26 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of infrared processing adc circuit performance is than survey method |
| CN109765477A (en) * | 2018-12-20 | 2019-05-17 | 西安现代控制技术研究所 | Test equipment for accelerometer signal collection plate |
| CN110441592A (en) * | 2019-09-17 | 2019-11-12 | 贵州电网有限责任公司 | A kind of the sampling early warning system and method for GIS electronic mutual inductor acquisition unit |
-
2018
- 2018-03-30 CN CN201820468074.1U patent/CN207937828U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387777A (en) * | 2018-11-09 | 2019-02-26 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of infrared processing adc circuit performance is than survey method |
| CN109765477A (en) * | 2018-12-20 | 2019-05-17 | 西安现代控制技术研究所 | Test equipment for accelerometer signal collection plate |
| CN109765477B (en) * | 2018-12-20 | 2021-07-02 | 西安现代控制技术研究所 | Test equipment for accelerometer signal acquisition board |
| CN110441592A (en) * | 2019-09-17 | 2019-11-12 | 贵州电网有限责任公司 | A kind of the sampling early warning system and method for GIS electronic mutual inductor acquisition unit |
| CN110441592B (en) * | 2019-09-17 | 2024-05-07 | 贵州电网有限责任公司 | Sampling early warning system and method of electronic transformer acquisition unit for GIS |
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Address after: 4 / F, building 1, No.14 Jiuxianqiao Road, Chaoyang District, Beijing 100020 Patentee after: Beijing Jingwei Hengrun Technology Co., Ltd Address before: 100101 Beijing city Chaoyang District Anxiang Beili 11 B block 8 layer of Beijing Jingwei Hengrun Technology Co. Ltd. Patentee before: Beijing Jingwei HiRain Technologies Co.,Ltd. |
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