CN203705467U - Acquisition circuit of airborne frequency signal - Google Patents
Acquisition circuit of airborne frequency signal Download PDFInfo
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- CN203705467U CN203705467U CN201320775898.0U CN201320775898U CN203705467U CN 203705467 U CN203705467 U CN 203705467U CN 201320775898 U CN201320775898 U CN 201320775898U CN 203705467 U CN203705467 U CN 203705467U
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- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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Abstract
The utility model belongs to the technical field of aviation electronics and especially relates to an acquisition circuit of an airborne frequency signal. The circuit comprises a voltage clamping circuit (1), a filter circuit (2), a comparison circuit (3) and a digital shaping circuit (4). The voltage clamping circuit (1) is connected with the filter circuit (2), an output end of the filter circuit (2) is accessed to the comparison circuit, and an output end of the comparison circuit (3) is connected to the digital shaping circuit (4). The acquisition circuit can acquire a rotation speed signal of a single end to ground and is also suitable for a differential type rotation speed signal; an acquisition interface does not limit positive and negative ends of an input signal, and the input signal can be normally connected and also can be reversely connected; and an operational amplifier is used to replace a comparator in use, symmetry of two thresholds of the comparator is realized, and flexibility of application is improved.
Description
Technical field
The utility model belongs to avionics field, particularly relates to a kind of Acquisition Circuit of airborne frequency signal.
Background technology
Airborne frequency signal Acquisition Circuit is mainly used in gathering the engine speed of aircraft, is a kind of more conventional circuit.
Traditional engine rotational speed signal Acquisition Circuit is mainly nursed one's health into engine rotational speed signal by the device such as comparer, optocoupler the pulse type signal of standard, for controller collection, circuit theory is simple, in Fig. 1, the modulate circuit that adopts comparer, resistance, trigger etc. to form, can convert tach signal to pulse signal, for processor collection.In Fig. 2, the frequency signal modulate circuit forming with inductance, resistance, electric capacity and optocoupler, also can nurse one's health into pulse type signal by tach signal, gathers for processor.
As frequency signal Acquisition Circuit 1 traditional in Fig. 1, comprise protection, comparison, filtering and four parts of shaping, holding circuit forms, is respectively used to prevent that by two diodes too high or too low magnitude of voltage from appearring in input signal; Comparator circuit part is made up of a hysteresis loop comparator, owing to having introduced feedback, not only has hysteretic characteristic, and correspondingly, its antijamming capability has also obtained reinforcement.Filtering circuit is made up of an electric capacity, and shaping circuit is made up of two triggers.This circuit can effectively be realized tach signal is nursed one's health into pulse form signal, possesses certain antijamming capability simultaneously.
But this circuit exists following three large shortcomings: first, this Acquisition Circuit is not suitable for signal reversal connection, " tach signal " and " tach signal ground " two signals can only adopt illustrated connection, and after reversal connection, illustrated circuit cannot be nursed one's health normally; Secondly, this circuit is only applicable to the single-ended tach signal of type over the ground, but on machine, engine signal mostly is difference type frequency signal, and circuit in Fig. 1 can cause the positive and negative signal impedance of sensor source unbalanced, if the output of speed probe is also parallel with other airborne equipments, this circuit easily affects equipment in parallel.Again; in the time that the amplitude of input speed signal becomes large gradually; because be connected with the reason of protection diode between the power supply VCC of the positive input terminal of comparer and comparer; there will be the positive input terminal voltage of comparer to be greater than the situation of comparer power supply VCC; the situation that easily occurs in this case the upset of comparer mistake, causes back-end controller pulse signal to be made mistakes.
As frequency signal Acquisition Circuit 2 traditional in Fig. 2, this circuit employing inductance and electric capacity filtering high frequency clutter, diode are back clamping, for the protection of the light emitting diode of optocoupler inside.The tach signal that sensor is sent here, after interface circuit clamp, filtering, shaping, anti-interference process, enters optocoupler and triggers judgement, generates the pulse type signal that processor can be processed.
But also there are following two large shortcomings in this technology: first, optocoupler is current drive-type device, only has drive current when illuminator to reach certain ability could to drive the triode of rear end, therefore, can the circuit of Fig. 2 be realized the normal conditioning functions of frequency signal and will be subject to the restriction such as source sensor output voltage amplitude and output driving current size.Secondly, this circuit can only gather the single-ended frequency signal of type over the ground, and the positive and negative terminal of input signal can not reversal connection.
Summary of the invention
Goal of the invention: a kind of Acquisition Circuit of airborne frequency signal is provided, can overcomes the existing defect of traditional airborne tach signal Acquisition Circuit.
Technical scheme: a kind of Acquisition Circuit of airborne frequency signal, circuit comprises voltage clamping circuit 1, filtering circuit 2, comparator circuit 3 and digital shaping circuit 4, described voltage clamping circuit 1 is connected with filtering circuit 2, the output terminal of filtering circuit 2 is linked into comparator circuit, and the output terminal of comparator circuit 3 is connected to digital shaping circuit 4.
Described clamp circuit is made up of four diode V1, V2, V3, V4.
Described comparator circuit 3 is made up of operational amplifier A D1 and feedback resistance R3, and the anode of operational amplifier A D1 is connected with two diode V1 and V2, opposite direction, and negative terminal is connected with two diode V3 and V4, opposite direction.
Numeral shaping circuit 4 use metal-oxide-semiconductor V5 realize, and V5 is the metal-oxide-semiconductor of N raceway groove.
Beneficial effect: the utility model not only can gather single-ended tach signal over the ground, also be applicable to difference type tach signal, and acquisition interface does not limit the positive and negative terminal of input signal, can just connect, also can reversal connection, replace the use of comparer with operational amplifier, make two threshold values of comparer realize symmetry, improved the dirigibility of application.
Brief description of the drawings
Fig. 1 is traditional tach signal Acquisition Circuit 1;
Fig. 2 is traditional tach signal Acquisition Circuit 2;
Fig. 3 is the schematic block circuit diagram of the utility model embodiment;
Fig. 4 is the circuit diagram of the utility model embodiment;
Fig. 5 is the oscillogram after the utility model conditioning.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail, refers to Fig. 3 to Fig. 5.
A kind of Acquisition Circuit of airborne frequency signal, circuit comprises voltage clamping circuit 1, filtering circuit 2, comparator circuit 3 and digital shaping circuit 4, described voltage clamping circuit 1 is connected with filtering circuit 2, the output terminal of filtering circuit 2 is linked into comparator circuit, and the output terminal of comparator circuit 3 is connected to digital shaping circuit 4.
Described clamp circuit is made up of four diode V1, V2, V3, V4.
Described comparator circuit 3 is made up of operational amplifier A D1 and feedback resistance R3, and the anode of operational amplifier A D1 is connected with two diode V1 and V2, opposite direction, and negative terminal is connected with two diode V3 and V4, opposite direction.
Numeral shaping circuit 4 use metal-oxide-semiconductor V5 realize, and V5 is the metal-oxide-semiconductor of N raceway groove.
Consult Fig. 3, the airborne tach signal Acquisition Circuit of the utility model is by voltage clamping circuit 1, filtering circuit 2, and threshold value comparator circuit 3, digital shaping circuit 4 forms.
The course of work of the present utility model is as follows:
The positive and negative terminal of input speed signal, by after isolation resistance, carries out clamp by the positive and negative terminal voltage of input speed signal respectively by clamp circuit 1, the comparator circuit 3 of protection rear end.The output of clamp circuit 1 is connected on filtering circuit 2, and filtering circuit 2 carries out filtering processing to input signal.The output of filtering circuit 2 is connected on comparator circuit on 3 input end, and comparator circuit 3 carries out shaping for the first time to filtered circuit, and tach signal is nursed one's health into the pulse form signal that amplitude is very high.The output of comparator circuit 3 is connected on the input end of digital shaping circuit 4, the full sized pules shape signal that digital shaping circuit 4 becomes processor to gather pulse form signal condition very high amplitude.
Consult Fig. 4:
The positive and negative terminal of input speed signal is connected on the input end of clamp circuit 1 after by isolation resistance R1, R2, clamp circuit 1 is made up of four commutation diode V1, V2, V3 and V4, wherein the anode of input signal connects two diode V1 and V2, positive and negative terminal opposite direction, the negative terminal of input signal connects two commutation diode V3 and V4, positive and negative terminal opposite direction.By clamp circuit 1, within the scope of be all clamped to-0.7V of the positive and negative terminal voltage-to-ground～+ 0.7V of input signal, for the circuit of rear end provides protection, can allow front end input signal to reach very high voltage simultaneously.
Filtering circuit 2 is made up of R1 and C1, by the low-pass filter of R1 and C1 composition, input signal is carried out to High frequency filter.
Comparator circuit 3 is made up of operational amplifier A D1 and feedback resistance R3, feedback resistance R3 is connected across the positive input terminal of operational amplifier A D1 and the output terminal of operational amplifier A D1, form a hysteresis loop comparator by the positive feedback of operational amplifier, improved the antijamming capability of circuit.Meanwhile, replace comparer can realize the symmetry of positive and negative two threshold values of comparator circuit to 0V with operational amplifier.Realize the first step of shaping modulate circuit through comparator circuit 3, tach signal is nursed one's health into amplitude be ± the pulse form signal of 15V, the oscillogram of waveform after as comparator circuit conditioning in Fig. 5.
Numeral shaping circuit 4 is made up of the metal-oxide-semiconductor of resistance R 4 and N raceway groove.The VGS of metal-oxide-semiconductor is 1-2V, and the signal of exporting when comparator circuit 3 is during for+15V, and this magnitude of voltage is greater than the gate source voltage VGS of metal-oxide-semiconductor, metal-oxide-semiconductor V5 conducting, and drain electrode place of metal-oxide-semiconductor is low level; The signal of exporting when comparator circuit 3 is during for-15V, and this magnitude of voltage is less than the gate source voltage of metal-oxide-semiconductor, metal-oxide-semiconductor V5 cut-off, and drain electrode place of metal-oxide-semiconductor is high level.Utilize the switching characteristic of metal-oxide-semiconductor, the pulse form signal of the pulse form signal condition one-tenth+5V that the amplitude that comparator circuit 3 is exported is ± 15V, the oscillogram of waveform after as digital shaping conditioning in Fig. 5, controller can gather the pulse signal of canonical form, calculates the frequency values of front end tach signal.
Claims (4)
1. the Acquisition Circuit of an airborne frequency signal, it is characterized in that: circuit comprises voltage clamping circuit [1], filtering circuit [2], comparator circuit [3] and digital shaping circuit [4], described voltage clamping circuit [1] is connected with filtering circuit [2], the output terminal of filtering circuit [2] is linked into comparator circuit, and the output terminal of comparator circuit [3] is connected to digital shaping circuit [4].
2. the Acquisition Circuit of a kind of airborne frequency signal according to claim 1, is characterized in that: described clamp circuit is made up of four diode V1, V2, V3, V4.
3. the Acquisition Circuit of a kind of airborne frequency signal according to claim 2, it is characterized in that, described comparator circuit [3] is made up of operational amplifier A D1 and feedback resistance R3, the anode of operational amplifier A D1 is connected with two diode V1 and V2, opposite direction, negative terminal is connected with two diode V3 and V4, opposite direction.
4. the Acquisition Circuit of a kind of airborne frequency signal according to claim 3, is characterized in that: digital shaping circuit [4] is realized with metal-oxide-semiconductor V5, and V5 is the metal-oxide-semiconductor of N raceway groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320775898.0U CN203705467U (en) | 2013-11-28 | 2013-11-28 | Acquisition circuit of airborne frequency signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320775898.0U CN203705467U (en) | 2013-11-28 | 2013-11-28 | Acquisition circuit of airborne frequency signal |
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| Publication Number | Publication Date |
|---|---|
| CN203705467U true CN203705467U (en) | 2014-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320775898.0U Expired - Lifetime CN203705467U (en) | 2013-11-28 | 2013-11-28 | Acquisition circuit of airborne frequency signal |
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| CN (1) | CN203705467U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330583A (en) * | 2014-10-28 | 2015-02-04 | 陕西千山航空电子有限责任公司 | Aircraft engine rotating speed signal acquisition circuit |
| CN106248986A (en) * | 2016-08-16 | 2016-12-21 | 中车株洲电力机车研究所有限公司 | A kind of speed acquisition device and method |
| CN108519540A (en) * | 2018-06-29 | 2018-09-11 | 东莞市李群自动化技术有限公司 | A kind of break detection circuit |
| CN109839511A (en) * | 2017-11-27 | 2019-06-04 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of tach signal Acquisition Circuit |
| CN110441598A (en) * | 2019-09-10 | 2019-11-12 | 西安联飞智能装备研究院有限责任公司 | Isolated form wide range of frequencies Acquisition Circuit |
| CN110823316A (en) * | 2019-10-25 | 2020-02-21 | 德阳市新泰自动化仪表有限公司 | Capacitance signal detection circuit with interference shielding function |
| CN111769829A (en) * | 2020-07-22 | 2020-10-13 | 上海客益电子有限公司 | Signal conversion circuit supporting positive and negative connection |
-
2013
- 2013-11-28 CN CN201320775898.0U patent/CN203705467U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330583A (en) * | 2014-10-28 | 2015-02-04 | 陕西千山航空电子有限责任公司 | Aircraft engine rotating speed signal acquisition circuit |
| CN106248986A (en) * | 2016-08-16 | 2016-12-21 | 中车株洲电力机车研究所有限公司 | A kind of speed acquisition device and method |
| CN106248986B (en) * | 2016-08-16 | 2019-05-03 | 中车株洲电力机车研究所有限公司 | A kind of speed acquisition device and method |
| CN109839511A (en) * | 2017-11-27 | 2019-06-04 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of tach signal Acquisition Circuit |
| CN108519540A (en) * | 2018-06-29 | 2018-09-11 | 东莞市李群自动化技术有限公司 | A kind of break detection circuit |
| CN110441598A (en) * | 2019-09-10 | 2019-11-12 | 西安联飞智能装备研究院有限责任公司 | Isolated form wide range of frequencies Acquisition Circuit |
| CN110823316A (en) * | 2019-10-25 | 2020-02-21 | 德阳市新泰自动化仪表有限公司 | Capacitance signal detection circuit with interference shielding function |
| CN110823316B (en) * | 2019-10-25 | 2021-10-01 | 德阳市新泰自动化仪表有限公司 | Capacitance signal detection circuit with interference shielding function |
| CN111769829A (en) * | 2020-07-22 | 2020-10-13 | 上海客益电子有限公司 | Signal conversion circuit supporting positive and negative connection |
| CN111769829B (en) * | 2020-07-22 | 2023-12-08 | 上海先积集成电路有限公司 | Signal conversion circuit supporting forward and reverse connection |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140709 |