CN202634310U - High-speed digital input terminal circuit - Google Patents
High-speed digital input terminal circuit Download PDFInfo
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- CN202634310U CN202634310U CN 201220142980 CN201220142980U CN202634310U CN 202634310 U CN202634310 U CN 202634310U CN 201220142980 CN201220142980 CN 201220142980 CN 201220142980 U CN201220142980 U CN 201220142980U CN 202634310 U CN202634310 U CN 202634310U
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Abstract
The utility model relates to a high-speed digital input terminal circuit, which comprises an input filter circuit, an opto-couplersisolation circuit and an output filter circuit. The input filter circuit, the opto-couplersisolation circuit and the output filter circuit are sequentially connected with each other. The opto-couplersisolation circuit comprises an optocoupler U1, a triode Q1, a sampling resistor R4 and a balancing resistor R5. The balancing resistor R5 is connected in series between the positive input end and the negative input end of the opto-couplersisolation circuit. The collector of the triode Q1 is connected with the positive input end of the opto-couplersisolation circuit. The emitter of the triode Q1 is connected with the negative input end of the opto-couplersisolation circuit. The sampling resistor R4 is connected in series between the base of the triode Q1 and the emitter of the triode Q1. The positive input end of the opto-couplersisolation circuit is connected with the anode of the primary light emitting diode of the optocoupler U1. The base of the triode Q1 is connected with the cathode of the primary light emitting diode of the optocoupler U1. According to the technical scheme of the utility model, the triode Q1 and related elements are additionally arranged in the opto-couplersisolation circuit, so that the oversaturation of the primary current flowing through the optocoupler U1 is avoided. Thus, the optocoupler U1 is ensured to be good in transmission performance, and the anti-interference capability of the circuit is improved.
Description
Technical field
The utility model relates to the circuit engineering field, more particularly, relates to a kind of high-speed figure input terminal circuit.
Background technology
Outside for ease PLC or other device design several roads high-speed figure input terminal as signal input port usually to the control of frequency converter in frequency converter.The common several kinds of circuit of high-speed figure input terminal are shown in Fig. 1-3.In order to protect the Frequency Converter Control plate, in the high-speed figure input terminal, isolate with a high speed photo coupling U1 usually.On the former limit of optocoupler U1, the light-emitting diodes tube anode is received power supply VCC1 through a current-limiting resistance R1, and negative electrode is received the DI input.The input of optocoupler U1 secondary is owing to being the collector electrode input, so meet a pull-up resistor R3 to high level VCC2.For burr in the filtered signal, this high-speed figure input terminal circuit generally is divided into three parts, i.e. input filter circuit, optical coupling isolation circuit and output filter circuit.For example, as forming output filter circuit at output filter capacitor C2 of output termination among Fig. 1-3, also can be as forming input filter circuit at input filter capacitor C1 of input termination among Fig. 2-3.The effect of resistance R 2 is the input impedance of balance numeral terminal among Fig. 3, reduces the propagation delay time of optocoupler, plays a protective effect to isolating optocoupler simultaneously.
Though above-mentioned several frequently seen high-speed figure input terminal is simple and practical, also fatal shortcoming, its antijamming capability is not strong.The scene that frequency converter is used is often disturbed very strong, and this interference should be the equipment from the frequency converter periphery from the PWM high-frequency harmonic noise of frequency converter itself on the one hand on the one hand.When frequency converter and other equipment networks, long lead or too much lead tie together, and this high-speed figure input terminal is easy to be interfered and produces misoperation.Because optocoupler U1 is operated in certain current threshold scope; When the high-speed figure input terminal is interfered the primary current that causes optocoupler U1 when excessive; Its optocoupler U1 is easy to generate misoperation, with the high-speed transfer that influences digital signal, and then can not satisfy the requirement of accurate control.
The utility model content
The technical problem that the utility model will solve is, does not influence the defective of the high-speed transfer of digital signal by force to having the sub antijamming capability of digital input end now, and a kind of high-speed figure input terminal circuit is provided.
The utility model solves the technical scheme that its technical problem adopted: construct a kind of high-speed figure input terminal circuit; Comprise: the input filter circuit, optical coupling isolation circuit and the output filter circuit that link to each other successively, said optical coupling isolation circuit comprises: optocoupler U1, triode Q1, sampling resistor R4 and balance resistance R 5; Said balance resistance R5 is connected between the positive input terminal and negative input end of optical coupling isolation circuit; The collector electrode of said triode Q1 links to each other with the positive input terminal of said optical coupling isolation circuit, and emitter links to each other with the negative input end of said optical coupling isolation circuit, is in series with said sampling resistor R4 between the base stage of said triode Q1 and the emitter; The positive input terminal of said optical coupling isolation circuit links to each other with the light-emitting diodes tube anode on the former limit of said optocoupler U1, and the base stage of said triode Q1 links to each other with the light-emitting diodes tube cathode on the former limit of said optocoupler U1.
In the described high-speed figure input terminal circuit according to the utility model, said high-speed figure input terminal circuit also comprises: be connected the full-wave rectification bridge between said input filter circuit and the optical coupling isolation circuit.
In the described high-speed figure input terminal circuit according to the utility model, said input filter circuit comprises: current-limiting resistance R1, current-limiting resistance R2 and input filter capacitor C1; The first input end that said current-limiting resistance R1 and the current-limiting resistance R2 of first signal input part of said high-speed figure input terminal circuit through series connection successively is connected to said full-wave rectification bridge; The secondary signal input of said high-speed figure input terminal circuit links to each other with second input of said full-wave rectification bridge; And the node between said current-limiting resistance R1 and the current-limiting resistance R2 is connected to second input of said full-wave rectification bridge through said input filter capacitor C1.
In the described high-speed figure input terminal circuit according to the utility model, said output filter circuit comprises: pull-up resistor R3, current-limiting resistance R6 and output filter capacitor C2; The first termination high level VCC of the secondary of said optocoupler U1, second end of the secondary of said optocoupler U1 meets said high level VCC through said pull-up resistor R3; And second end of the secondary of said optocoupler U1 connects the output of said high-speed figure input terminal circuit through said current-limiting resistance R6, and the output of said high-speed figure input terminal circuit is through said output filter capacitor C2 ground connection.
Implement the high-speed figure input terminal circuit of the utility model; Have following beneficial effect: the utility model is through setting up triode Q1 and related elements in optical coupling isolation circuit; Prevent to flow into the electric current supersaturation on the former limit of optocoupler U1,, also can ensure the quick work of optocoupler U1 even when high-speed figure input terminal circuit is interfered; Make it give full play to the transmission performance of isolating optocoupler, and further improve the antijamming capability of circuit through input filter circuit and output filter circuit.
Description of drawings
To combine accompanying drawing and embodiment that the utility model is described further below, in the accompanying drawing:
Fig. 1 is the circuit diagram of first kind of high-speed figure input terminal in the prior art;
Fig. 2 is the circuit diagram of second kind of high-speed figure input terminal in the prior art;
Fig. 3 is the circuit diagram of the third high-speed figure input terminal in the prior art;
Fig. 4 is the circuit theory diagrams according to the preferred embodiment of the high-speed figure input terminal circuit of the utility model.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.
See also Fig. 4, be circuit theory diagrams according to the preferred embodiment of the high-speed figure input terminal circuit of the utility model.As shown in Figure 4, the high-speed figure input terminal circuit that present embodiment provides comprises at least: the input filter circuit 10, optical coupling isolation circuit 30 and the output filter circuit 40 that link to each other successively.Because present embodiment can further be applied to two-way input, therefore can also set up full-wave rectification bridge 20.
Wherein, input filter circuit 10 is used for input signal is carried out exporting after the filtering.Optical coupling isolation circuit 30 is used to carry out light-coupled isolation, the former limit of promptly filtered input signal input optocoupler U1, and optocoupler U1 secondary carries out the filtering burr through output filter circuit 40 and exports.
The utility model mainly through in optical coupling isolation circuit 30 through setting up triode Q1 and related device, the electric current on the former limit of input optocoupler U1 is limited, prevent its supersaturation.Particularly, optical coupling isolation circuit 30 comprises: optocoupler U1, triode Q1, sampling resistor R4 and balance resistance R 5.
Wherein, balance resistance R5 is connected between the positive input terminal and negative input end of optical coupling isolation circuit 30.The collector electrode of triode Q1 links to each other with the positive input terminal of optical coupling isolation circuit 30, and emitter links to each other with the negative input end of optical coupling isolation circuit 30, is in series with sampling resistor R4 between the base stage of triode Q1 and the emitter.The positive input terminal of optical coupling isolation circuit 30 links to each other with the light-emitting diodes tube anode on the former limit of optocoupler U1, and the base stage of triode Q1 links to each other with the light-emitting diodes tube cathode on the former limit of optocoupler U1.Fig. 4 only shows the method that connects when triode Q1 is NPN, and the utility model also can adopt the triode of PNP to realize, only need its pin annexation be adjusted accordingly to get final product.
Constitute high speed photo coupling buffer circuit through triode Q1, sampling resistor R4 and balance resistance R 5 and optocoupler U1 with good transmission performance.Can the electric current that flow into the former limit of optocoupler U1 be limited in the operating current threshold range of optocoupler U1 through triode Q1,, also can ensure the quick work of optocoupler U1 even when high-speed figure input terminal circuit is interfered.Therefore, the circuit of the utility model can be given full play to the transmission performance of isolating optocoupler, can realize that in addition safety is isolated and the raising signal to noise ratio, is the basis of realizing high anti-jamming capacity.
The input filter circuit 10 that adopts in the utility model comprises: current-limiting resistance R1, current-limiting resistance R2 and input filter capacitor C1.
The high-speed figure input terminal circuit amphicheirality of this embodiment is bidirectional high speed digital input end electronic circuit.It has the first signal input part DI (digital signal input end) and secondary signal input OP (common port).That is to say no matter be to draw on the first signal input part DI on power supply or the secondary signal input OP to draw power supply, also no matter signal is just or negative, can pass through this circuit, realizes the signal transmission.
The first input end that current-limiting resistance R1 and the current-limiting resistance R2 of the first signal input part DI of this high-speed figure input terminal circuit through series connection successively is connected to full-wave rectification bridge 20.The secondary signal input OP of this high-speed figure input terminal circuit links to each other with second input of full-wave rectification bridge 20.And the node between current-limiting resistance R1 and the current-limiting resistance R2 is connected to second input of full-wave rectification bridge through input filter capacitor C1.At this, current-limiting resistance R1, current-limiting resistance R2 and input filter capacitor C1 form the front end bidirectional filter, can realize the filter effect of giving prominence to through reasonable parameter configuration.Current-limiting resistance R1 and current-limiting resistance R2 play the effect of current limliting and adjusting input logic level simultaneously.
Diode D1 and diode D2 form full-wave rectification bridge, and no matter the direction of input signal can both be carried out rectification to it and converted direct current output into, realizes the two-way signaling input.
Output filter circuit 40 further comprises: pull-up resistor R3, current-limiting resistance R6 and output filter capacitor C2.The first termination high level VCC of the secondary of optocoupler U1, second end of the secondary of optocoupler U1 meets high level VCC through pull-up resistor R3.And second end of the secondary of optocoupler U1 meets the output OUT of high-speed figure input terminal circuit through current-limiting resistance R6, and the output OUT of high-speed figure input terminal circuit is through output filter capacitor C2 ground connection.Wherein, current-limiting resistance R6 and output filter capacitor C2 form rear end RC filter, the burr in the filtering output signal, and its reasonable parameter configuration can realize the filter effect given prominence to.
This shows that the high-speed figure input terminal circuit of the utility model has three remarkable characteristics:
1, amphicheirality.No matter be to draw on the first signal input part DI on power supply or the secondary signal input OP to draw power supply, no matter signal is just or negative, can pass through this circuit, realizes the signal transmission;
2, high speed characteristics.Constitute the high-speed isolated circuit through triode Q1, sampling resistor R4 and balance resistance R 5 and optocoupler U1.Than circuit common, has better signal transmission performance like the buffer circuit of Fig. 1-3;
3, high anti-jamming capacity characteristic.Reasonable Parameters through current-limiting resistance R1, current-limiting resistance R2, input filter capacitor C1, current-limiting resistance R6 and output filter capacitor C2 cooperates, and its antijamming capability is far above the interference free performance of the circuit shown in Fig. 1-3.
In sum, the outstanding advantage of the high-speed figure input terminal circuit of the utility model is to have outstanding antijamming capability.Prior art is generally directly added filter capacitor at optocoupler input or output, though cut down the noise amplitude on the digital signal to a certain extent, under the strong jamming situation, still can be interfered.And the utility model has greatly improved the signal to noise ratio of logic level through the reasonable cooperation of above-mentioned several sections circuit, thereby makes high-speed figure input terminal circuit have outstanding antijamming capability.
The utility model is described according to specific embodiment, but it will be understood by those skilled in the art that when not breaking away from the utility model scope, can carry out various variations and be equal to replacement.In addition, for adapting to the specific occasion or the material of the utility model technology, can carry out many modifications and not break away from its protection range the utility model.Therefore, the utility model is not limited to specific embodiment disclosed herein, and comprises that all drop into the embodiment of claim protection range.
Claims (4)
1. high-speed figure input terminal circuit comprises: the input filter circuit, optical coupling isolation circuit and the output filter circuit that link to each other successively is characterized in that said optical coupling isolation circuit comprises: optocoupler U1, triode Q1, sampling resistor R4 and balance resistance R 5;
Said balance resistance R5 is connected between the positive input terminal and negative input end of optical coupling isolation circuit;
The collector electrode of said triode Q1 links to each other with the positive input terminal of said optical coupling isolation circuit, and emitter links to each other with the negative input end of said optical coupling isolation circuit, is in series with said sampling resistor R4 between the base stage of said triode Q1 and the emitter;
The positive input terminal of said optical coupling isolation circuit links to each other with the light-emitting diodes tube anode on the former limit of said optocoupler U1, and the base stage of said triode Q1 links to each other with the light-emitting diodes tube cathode on the former limit of said optocoupler U1.
2. high-speed figure input terminal circuit according to claim 1 is characterized in that, said high-speed figure input terminal circuit also comprises: be connected the full-wave rectification bridge between said input filter circuit and the optical coupling isolation circuit.
3. high-speed figure input terminal circuit according to claim 2 is characterized in that said input filter circuit comprises: current-limiting resistance R1, current-limiting resistance R2 and input filter capacitor C1;
The first input end that said current-limiting resistance R1 and the current-limiting resistance R2 of first signal input part of said high-speed figure input terminal circuit through series connection successively is connected to said full-wave rectification bridge;
The secondary signal input of said high-speed figure input terminal circuit links to each other with second input of said full-wave rectification bridge;
And the node between said current-limiting resistance R1 and the current-limiting resistance R2 is connected to second input of said full-wave rectification bridge through said input filter capacitor C1.
4. high-speed figure input terminal circuit according to claim 1 is characterized in that said output filter circuit comprises: pull-up resistor R3, current-limiting resistance R6 and output filter capacitor C2;
The first termination high level VCC of the secondary of said optocoupler U1, second end of the secondary of said optocoupler U1 meets said high level VCC through said pull-up resistor R3; And second end of the secondary of said optocoupler U1 connects the output of said high-speed figure input terminal circuit through said current-limiting resistance R6, and the output of said high-speed figure input terminal circuit is through said output filter capacitor C2 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220142980 CN202634310U (en) | 2012-04-06 | 2012-04-06 | High-speed digital input terminal circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220142980 CN202634310U (en) | 2012-04-06 | 2012-04-06 | High-speed digital input terminal circuit |
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| CN202634310U true CN202634310U (en) | 2012-12-26 |
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| CN 201220142980 Expired - Lifetime CN202634310U (en) | 2012-04-06 | 2012-04-06 | High-speed digital input terminal circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529720A (en) * | 2013-09-26 | 2014-01-22 | 浙江吉利控股集团有限公司 | Digital input circuit and vehicle-mounted controller using same |
| CN104122816A (en) * | 2014-06-30 | 2014-10-29 | 深圳市汇川技术股份有限公司 | Electric vehicle high-speed digital input circuit |
| CN106128003A (en) * | 2016-08-27 | 2016-11-16 | 无锡蓝天电子股份有限公司 | A kind of device reducing warning bus apparatus electric current |
| CN106941349A (en) * | 2016-01-05 | 2017-07-11 | 浙江盾安机械有限公司 | A kind of low delay optical coupling isolation circuit and RS485 isolate telecommunication circuit |
-
2012
- 2012-04-06 CN CN 201220142980 patent/CN202634310U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529720A (en) * | 2013-09-26 | 2014-01-22 | 浙江吉利控股集团有限公司 | Digital input circuit and vehicle-mounted controller using same |
| CN104122816A (en) * | 2014-06-30 | 2014-10-29 | 深圳市汇川技术股份有限公司 | Electric vehicle high-speed digital input circuit |
| CN106941349A (en) * | 2016-01-05 | 2017-07-11 | 浙江盾安机械有限公司 | A kind of low delay optical coupling isolation circuit and RS485 isolate telecommunication circuit |
| CN106128003A (en) * | 2016-08-27 | 2016-11-16 | 无锡蓝天电子股份有限公司 | A kind of device reducing warning bus apparatus electric current |
| CN106128003B (en) * | 2016-08-27 | 2018-12-25 | 无锡蓝天电子股份有限公司 | A kind of device reducing alarm bus apparatus electric current |
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| C14 | Grant of patent or utility model | ||
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Effective date of registration: 20160217 Address after: Shenzhen City, Guangdong province Baoan 518101 District 70 Liu Xian Road two Hongwei Industrial Park building E building 1-3 Patentee after: Shenzhen Inovance Technology Co., Ltd. Patentee after: Suzhou Huichuan Technology Co.,Ltd. Address before: 518101 Guangdong city of Shenzhen province Baoan District no 70 District Liu Xian two road Hongwei Dong Industrial Zone E Patentee before: Shenzhen Inovance Technology Co., Ltd. Patentee before: Suzhou Huichuan Technology Co.,Ltd. Patentee before: Suzhou Monarch Control Technology Co., Ltd. |
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| CX01 | Expiry of patent term | ||
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Granted publication date: 20121226 |