CN103825600B - A kind of contact input interface circuit - Google Patents
A kind of contact input interface circuit Download PDFInfo
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- CN103825600B CN103825600B CN201410102133.XA CN201410102133A CN103825600B CN 103825600 B CN103825600 B CN 103825600B CN 201410102133 A CN201410102133 A CN 201410102133A CN 103825600 B CN103825600 B CN 103825600B
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Abstract
The present invention relates to a kind of contact input interface circuit.nullComparator U1 pin BS of the present invention、Pin BAL and pin VCC+ is connected with the electric capacity C2 of ground connection after being connected，The pin BS of comparator U1 is also associated with the resistance R5 and resistance R6 of supply voltage+5V VSI and series connection，Resistance R5 one end is connected with the earth terminal of electric capacity C2，The common port of resistance R5 and resistance R6 connects the pin IN of comparator U1,The pin VCC and pin EO of comparator U1 connects the earth terminal of electric capacity C2，The pin CO of comparator U1 connects resistance R7 and resistance R8，Resistance R7 connects external power source+5V VSI，Resistance R8 connects the base stage of NPN audion Q1，The grounded emitter of NPN audion Q1，The colelctor electrode of NPN audion Q1 connects indicator light circuit，Comparator U1 is also associated with input circuit.Strong interference immunity of the present invention, can effectively filter out disturbing pulse, and stable signal transmission.
Description
Technical field
The present invention relates to a kind of signal interface circuit, a kind of contact input interface circuit.
Background technology
Time check instrument, for the precision of checking time, is used for some and counts field accurately, requires time for, such as rocket launching, satellite navigation, astronomical clock etc., the field that precision is high.
The sinusoidal wave power frequency component of input is converted into square-wave signal and is input to FPGA by the power frequency measurement part of the signal plate of time check instrument, FPGA measure the square-wave signal cycle of input, thus obtain work frequency；Sometimes due to external issues or operational issue, the output frequency that can make work frequency and the setting obtained is inconsistent so that follow-up signal analysis goes wrong, thus reduces time check precision, affects instrument and uses.
Summary of the invention
The invention provides the testing circuit of a kind of power frequency output frequency, the power frequency output frequency that power frequency can be measured signaling conversion circuit conversion output detects, to ensure that output frequency is consistent with setpoint frequency, solve conventional output frequency and there is error, the problem affecting appliance time checking precision.
nullFor solving above-mentioned technical problem，The present invention is by the following technical solutions: the testing circuit of a kind of power frequency output frequency，Including comparator U1，The pin BS of comparator U1、Pin BAL and pin VCC+ is all connected with the electric capacity C2 of ground connection，And described pin BS、Pin BAL and pin VCC+ is respectively connected with high-voltage power supply+15V VFO，The pin VCC-of described comparator U1 connects outside LVPS-15V VFO，It is also associated with electric capacity C1 between LVPS-15V VFO and the earth terminal of electric capacity C2，The pin IN-of described comparator U1 connects high-voltage power supply+15V VFO by resistance R1，Described pin IN-is also associated with diode D1，The anode of diode D1 connects pin IN-，The negative electrode of described diode D1 is connected on the earth terminal of electric capacity C2，The pin EO of described comparator U1 connects the earth terminal of electric capacity C2，The pin CO of described comparator U1 is connected by resistance R3 audion Q1，The base stage of audion Q1 is connected with R3，The grounded emitter of described audion Q1，Described audion Q1 colelctor electrode connects LED light circuit，LED light circuit is also associated with photo-coupler U2.
Described LED light circuit includes LED VFO-circuit and LED VFO+ circuit, and LED VFO-circuit on one side is connected with the emitter stage of audion Q1 and the pin 2 of comparator U1, and the described LED VFO-circuit other end connects external LED display lamp；Described LED VFO+ circuit includes that the resistance R4 of concatenation and resistance R5, resistance R4 are connected with external LED display lamp, and the pin 1 of described resistance R5 and comparator U1 is connected, and the common port of described resistance R4 and resistance R5 connects external power source+5V
VFO and ground capacity C3.
The pin 3 of described photo-coupler U2 meets external power source PWRM
Being connected with external power source PWRM+3.3V by electric capacity C4 after pin 5 ground connection of+3.3V, described photo-coupler U2, the pin 4 of described photo-coupler U2 is back to examine signal VFO F1 output circuit, and described external power source PWRM+3.3V examines signal VFO with returning
The resistance R6 that resistance is 470 ohm it is also associated with between F1 output circuit.
Described comparator U1 selects LM211D type comparator.
Described photo-coupler U2 selects PS9714 type photo-coupler.
Described audion Q1 selects 9013 type audions.
Compared with prior art, the invention has the beneficial effects as follows: this contact input interface circuit of present invention design, strong interference immunity, disturbing pulse, and stable signal transmission can be effectively filtered out.
Accompanying drawing explanation
With detailed description of the invention, the present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 is the structural representation of the present invention.
Detailed description of the invention
The present invention is further illustrated below in conjunction with the accompanying drawings.
Embodiment
A kind of contact input interface circuit as shown in Figure 1, is connected with the electric capacity C2 of ground connection after being connected including pin BS, pin BAL and the pin VCC+ of comparator U1, comparator U1, and the pin BS of described comparator U1 is also associated with supply voltage+5V
The resistance R5 and resistance R6 of VSI and series connection, resistance R5 one end is connected with the earth terminal of electric capacity C2, the common port of described resistance R5 and resistance R6 connects the pin IN-of comparator U1, the pin VCC-and pin EO of described comparator U1 connects the earth terminal of electric capacity C2, the pin CO of described comparator U1 connects resistance R7 and resistance R8, resistance R7 connects external power source+5V VSI, described resistance R8 connects the base stage of NPN audion Q1, the grounded emitter of described NPN audion Q1, the colelctor electrode of described NPN audion Q1 connects indicator light circuit, described comparator U1 is also associated with input circuit.
Described input circuit includes three-phase socket CN4
NVSI, phase line NVSI+ of three-phase socket CN4 NVSI is serially connected with resistance R1, resistance R2 and resistance R4, and the pin IN+ of resistance R4 and comparator U1 is connected, described three-phase socket CN4
The VCC-of the zero line NVSI-and comparator U1 of NVSI is connected, go back between described phase line NVSI+ and zero line NVSI-and be connected to diode D1, diode D2 and resistance R3, the anode of described diode D1 connects phase line NVSI+, the negative electrode of described diode D1 connects the negative electrode of diode D2, the anode of described diode D2 connects zero line NVSI-, and described resistance R3 one end is connected to resistance R2 and the common port of resistance R4 and the resistance R3 other end connects zero line NVSI-.
The anode being also associated with diode D3, diode D3 between described resistance R1 and resistance R2 connects the negative electrode connection resistance R2 of R1, described diode D3.
The pin VCC+ of described comparator U1 is also associated with the electric capacity C2 of ground connection.
Described indicator light circuit includes LED
NVSI+ circuit and LED NVSI-circuit, LED NVSI+ circuit connects external power source+5V by resistance R9
VSI；The colelctor electrode of described LED NVSI-circuit and NPN audion Q1 is all connected with the pin 2 and LED of photo-coupler U2, photo-coupler U2
NVSI-circuit is connected with the colelctor electrode of NPN audion Q1, and the common port of electric capacity C3, described resistance R10 and electric capacity C3 that the pin 1 of described photo-coupler U2 connects ground connection by resistance R10 connects external power source+5V
VSI, the pin 4 of described photo-coupler U2 is output circuit NVSI1, the pin 5 of described photo-coupler U2 is connected with output circuit NVSI1 by resistance R11, the pin 5 of described photo-coupler U2 is also associated with comparing power supply PWRM+3.3V with the common port of resistance R11, relatively power supply PWRM+3.3V is also associated with the electric capacity C4 of ground connection, and the pin 3 of described photo-coupler U2 is connected with the earth terminal of electric capacity C4.
Described comparator U1 model is LM211D, and the model of described photo-coupler U2 is PS9714, and the model of described NPN audion Q1 is 9013.
The pin 1 i.e. Anode pin of photo-coupler U2, pin 2 i.e. Cathode pin, pin 3 i.e. GND pin, pin 4 i.e. VO pin, pin 5 i.e. VCC pin, use numeral expression for simplifying accompanying drawing spy.
In the present embodiment, AC signal is obtained low-voltage signal NVSI-V by resistance R3 dividing potential drop by phase line NVSI+ after diode D1 halfwave rectifier again, and resistance R5 and R6 is by supply voltage+5V
VSI dividing potential drop obtains datum NVSI-Vref, low-voltage signal NVSI-V and datum NVSI-Vref and is input to indicator light circuit LED NVSI-through NPN audion Q1 9013 after comparator U1 comparison operation, and is exported by optocoupler clutch.
D1, D2 in the present embodiment is used for voltage stabilizing, ensure that low-voltage signal NVSI-V is stable, electric capacity C1 and electric capacity C2 can filtering interference signals simultaneously, the precision and stability of the output signal of comparator U1 can be ensured, the output signal of comparator U1 is amplified into indicator light circuit by NPN audion Q1, indicator light circuit is for the stability of indication signal, and photo-coupler U2 receives after NVSI-V signal produces photoelectric current output signal NVSI1 after resistance R11 dividing potential drop and electric capacity C4 filter.
It is embodiments of the invention as mentioned above.The present invention is not limited to above-mentioned embodiment, and anyone should learn the structure change made under the enlightenment of the present invention, and every have same or like technical scheme, within each falling within protection scope of the present invention with the present invention.
Claims (2)
- null1. a contact input interface circuit，Including comparator U1，It is characterized in that: the pin BS of comparator U1、Pin BAL and pin VCC+ is connected with the electric capacity C2 of ground connection after being connected，The pin BS of described comparator U1 is also associated with the resistance R5 and resistance R6 of supply voltage+5V VSI and series connection，Resistance R5 one end is connected with the earth terminal of electric capacity C2，The common port of described resistance R5 and resistance R6 connects the pin IN-of comparator U1，The pin VCC-and pin EO of described comparator U1 connects the earth terminal of electric capacity C2，The pin CO of described comparator U1 connects resistance R7 and resistance R8，Resistance R7 connects external power source+5V VSI，Described resistance R8 connects the base stage of NPN audion Q1，The grounded emitter of described NPN audion Q1，The colelctor electrode of described NPN audion Q1 connects indicator light circuit，Described comparator U1 is also associated with input circuit；nullDescribed input circuit includes three-phase socket CN4 NVSI，Phase line NVSI+ of three-phase socket CN4 NVSI is serially connected with resistance R1、Resistance R2 and resistance R4，The pin IN+ of resistance R4 and comparator U1 is connected，The VCC-of the zero line NVSI-and comparator U1 of described three-phase socket CN4 NVSI is connected，Go back between described phase line NVSI+ and zero line NVSI-and be connected to diode D1、Diode D2 and resistance R3，The anode of described diode D1 connects phase line NVSI+，The negative electrode of described diode D1 connects the negative electrode of diode D2，The anode of described diode D2 connects zero line NVSI-，Described resistance R3 one end is connected to resistance R2 and the common port of resistance R4 and the resistance R3 other end connects zero line NVSI-，It is also associated with diode D3 between described resistance R1 and resistance R2，The anode of diode D3 connects R1，The negative electrode of described diode D3 connects resistance R2；Described indicator light circuit includes LED NVSI+ circuit and LED NVSI-circuit, and LED NVSI+ circuit connects external power source+5V VSI by resistance R9；nullDescribed LED NVSI-circuit is all connected with photo-coupler U2 with the colelctor electrode of NPN audion Q1，The pin 2 of photo-coupler U2 is connected with the colelctor electrode of LED NVSI-circuit with NPN audion Q1，The pin 1 of described photo-coupler U2 connects the electric capacity C3 of ground connection by resistance R10，The common port of described resistance R10 and electric capacity C3 connects external power source+5V VSI，The pin 4 of described photo-coupler U2 is output circuit NVSI1，The pin 5 of described photo-coupler U2 is connected with output circuit NVSI1 by resistance R11，The pin 5 of described photo-coupler U2 is also associated with comparing power supply PWRM+3.3V with the common port of resistance R11，Relatively power supply PWRM+3.3V is also associated with the electric capacity C4 of ground connection，The pin 3 of described photo-coupler U2 is connected with the earth terminal of electric capacity C4.
- A kind of contact input interface circuit the most according to claim 1, it is characterised in that: described comparator U1 model is LM211D, and the model of described photo-coupler U2 is PS9714, and the model of described NPN audion Q1 is 9013.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410102133.XA CN103825600B (en) | 2014-03-19 | 2014-03-19 | A kind of contact input interface circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410102133.XA CN103825600B (en) | 2014-03-19 | 2014-03-19 | A kind of contact input interface circuit |
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| CN103825600A CN103825600A (en) | 2014-05-28 |
| CN103825600B true CN103825600B (en) | 2016-08-17 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08172346A (en) * | 1994-12-20 | 1996-07-02 | Rohm Co Ltd | Phase circuit and chrominance signal processing circuit using the phase circuit |
| US5926042A (en) * | 1997-12-19 | 1999-07-20 | Advanced Micro Devices, Inc. | Precision clock frequency detector having reduced supply voltage dependence |
| CN101226077A (en) * | 2008-02-13 | 2008-07-23 | 华北电力大学 | Method for improving measurement precision of turbo unit shafting torsional vibration |
| CN102931952A (en) * | 2012-10-18 | 2013-02-13 | 株洲变流技术国家工程研究中心有限公司 | Synchronous signal acquisition system |
| CN103197130A (en) * | 2013-04-25 | 2013-07-10 | 国家电网公司 | Power grid voltage ZCP (Zero Crossing Point) detecting method and device |
| CN103592511A (en) * | 2013-11-13 | 2014-02-19 | 广州松下空调器有限公司 | Circuit for detecting alternating current power supply frequency |
| CN203466791U (en) * | 2013-09-24 | 2014-03-05 | 德阳瑞能电力科技有限公司 | Signal waveform conversion circuit and device thereof |
| CN203827314U (en) * | 2014-03-19 | 2014-09-10 | 成都引众数字设备有限公司 | Contact input interface circuit |
-
2014
- 2014-03-19 CN CN201410102133.XA patent/CN103825600B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08172346A (en) * | 1994-12-20 | 1996-07-02 | Rohm Co Ltd | Phase circuit and chrominance signal processing circuit using the phase circuit |
| US5926042A (en) * | 1997-12-19 | 1999-07-20 | Advanced Micro Devices, Inc. | Precision clock frequency detector having reduced supply voltage dependence |
| CN101226077A (en) * | 2008-02-13 | 2008-07-23 | 华北电力大学 | Method for improving measurement precision of turbo unit shafting torsional vibration |
| CN102931952A (en) * | 2012-10-18 | 2013-02-13 | 株洲变流技术国家工程研究中心有限公司 | Synchronous signal acquisition system |
| CN103197130A (en) * | 2013-04-25 | 2013-07-10 | 国家电网公司 | Power grid voltage ZCP (Zero Crossing Point) detecting method and device |
| CN203466791U (en) * | 2013-09-24 | 2014-03-05 | 德阳瑞能电力科技有限公司 | Signal waveform conversion circuit and device thereof |
| CN103592511A (en) * | 2013-11-13 | 2014-02-19 | 广州松下空调器有限公司 | Circuit for detecting alternating current power supply frequency |
| CN203827314U (en) * | 2014-03-19 | 2014-09-10 | 成都引众数字设备有限公司 | Contact input interface circuit |
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| CN103825600A (en) | 2014-05-28 |
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