CN203180889U - High-speed low-power opto-coupler communication circuit - Google Patents
High-speed low-power opto-coupler communication circuit Download PDFInfo
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- CN203180889U CN203180889U CN 201320125234 CN201320125234U CN203180889U CN 203180889 U CN203180889 U CN 203180889U CN 201320125234 CN201320125234 CN 201320125234 CN 201320125234 U CN201320125234 U CN 201320125234U CN 203180889 U CN203180889 U CN 203180889U
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Abstract
The utility model relates to a high-speed low-power opto-coupler communication circuit, which is characterized by comprising an optical coupler (OC1) and an optical coupler (OC2). The anode of the optical coupler (OC1) is connected with a power supply (VCC). The cathode of the optical coupler (OC1) is connected with one end of a resistor (R1). The emitter electrode of the optical coupler (OC1) is connected with another power supply (VSS). The collector electrode of the optical coupler (OC1) is served as a signal output end (OUT) and is connected with the emitter electrode of the optical coupler (OC2). The collector electrode of the optical coupler (OC2) is connected with a third power supply (VDD). The cathode of the optical coupler (OC2) is connected with a fourth power supply (GND). The anode of the optical coupler (OC2) is connected with one end of a resistor (R2). The other end of the resistor (R1) is served as a signal input end (IN) and is connected with the other end of the resistor (R2). The two ends of the resistor (R1) are connected in parallel with a capacitor (C1). The two ends of the resistor (R2) are connected in parallel with a capacitor (C2). Due to the adoption of the above connection proposal, the opto-coupler communication property of the circuit is higher in speed and lower in power consumption.
Description
Technical field
The utility model relates to the optocoupler communication applications, especially a kind of high-speed low-power-consumption optocoupler communicating circuit.
Background technology
Common optocoupler communicating circuit, if realize higher communication baud rate, the power of relative consumption is also bigger.Under transmitter 4～20mA two-wire system electric power thus supplied, the complete machine power consumption electric current of HART type is limited in about 3.2mA.Provide for other circuit has enough electric currents, wish that the power consumption of optocoupler communicating circuit is as far as possible few, for example: 0.3～0.5mA, realize 1200 baud rates of HART communication if desired, will select the more expensive low-power consumption optocoupler of price for use.If under the prerequisite of this power consumption restriction, wish that again communication speed brings up to more than 4800 baud rates, the low-power consumption optocoupler also can't be competent at.
The utility model content
In view of this, the purpose of this utility model provides a kind of high-speed low-power-consumption optocoupler communicating circuit.With the most cheap PC817(or clone EL817 etc.) optocoupler, in-40 ℃～+ 85 ℃ industrial temperature scopes, press Fig. 1 circuit application, only need 0.3～0.4mA electric current, just can realize the baud rate more than 4800.If press Fig. 2 circuit application, baud rate also can improve several times.
The utility model adopts following scheme to realize: a kind of high-speed low-power-consumption optocoupler communicating circuit is characterized in that: comprise an optocoupler OC1 and an optocoupler OC2; The anode of described optocoupler OC1 connects power supply VCC, the negative electrode of described optocoupler OC1 is connected with an end of a resistance R 1, the emitter of described optocoupler OC1 meets power supply VSS, the collector electrode of described optocoupler OC1 is connected as the signal output part OUT of described high-speed low-power-consumption optocoupler communicating circuit and with the emitter of described optocoupler OC2, the collector electrode of described optocoupler OC2 meets power vd D, the negative electrode of described optocoupler OC2 meets power supply GND, the anode of described optocoupler OC2 is connected with an end of a resistance R 2, the other end of described resistance R 1 is connected as the signal input part IN of described high-speed low-power-consumption optocoupler communicating circuit and with the other end of described resistance R 2, be parallel with a capacitor C 1 on the two ends of described resistance R 1, be parallel with a capacitor C 2 on the two ends of described resistance R 2.
In the utility model one embodiment, also comprise a diode D1 and a diode D2; The anode of described diode D1 connects the negative electrode of described optocoupler OC1, and the negative electrode of described diode D1 connects the anode of described optocoupler OC1; The anode of described diode D2 connects the negative electrode of described optocoupler OC2, and the negative electrode of described diode D2 connects the anode of described optocoupler OC2.
In the utility model one embodiment, also comprise a dead band current-limiting resistance R3; Described resistance R 3 one ends connect the emitter of described optocoupler OC1, and described resistance R 3 other ends connect power supply VSS; Perhaps described resistance R 3 one ends connect the collector electrode of described optocoupler OC1, and described resistance R 3 other ends connect the signal output part OUT of high-speed low-power-consumption optocoupler communicating circuit; Perhaps described resistance R 3 one ends connect the emitter of described optocoupler OC2, and described resistance R 3 other ends connect the signal output part OUT of high-speed low-power-consumption optocoupler communicating circuit; Perhaps described resistance R 3 one ends connect the collector electrode of described optocoupler OC2, and described resistance R 3 other ends connect power vd D.
In the utility model one embodiment, also comprise a resistance R 4, a resistance R 5 and a resistance R 6; One end of described resistance R 4 is as the signal input part IN of described high-speed low-power-consumption optocoupler communicating circuit, the other end of described resistance R 4 connects an end of described resistance R 5 and resistance R 6, the other end of described resistance R 5 connects the other end of described resistance R 1, and the other end of described resistance R 6 connects the other end of described resistance R 2.
In the utility model one embodiment, described resistance R 4, resistance R 5 and resistance R 6, short circuit one of them or two.
In the utility model one embodiment, the light-emitting diode of described optocoupler OC1 and the light-emitting diode of described optocoupler OC2 are exchanged, or the phototriode of described optocoupler OC1 and the phototriode of described optocoupler OC2 are exchanged.
The circuit side connector case that the utility model adopts can make the optocoupler communication possess higher speed and lower power consumption.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model first embodiment.
Fig. 2 is the circuit theory diagrams of the utility model second embodiment.
Fig. 3 is the circuit theory diagrams of the utility model the 3rd embodiment.
Fig. 4 is the circuit theory diagrams of the utility model the 4th embodiment.
Fig. 5 is the circuit theory diagrams of the utility model the 5th embodiment.
Fig. 6 is the circuit theory diagrams of the utility model the 6th embodiment.
Fig. 7 is the circuit theory diagrams of the utility model the 7th embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below will the utility model be described in further detail by specific embodiment and relevant drawings.
Because the optocoupler communicating circuit is in order to realize isolating communication, therefore need to use two groups of power supplys in IN input and OUT output both sides.One group of power supply importing a side is power supply VCC and power supply GND; One group of power supply exporting a side is power vd D and power supply VSS.
As shown in Figure 1, present embodiment provides a kind of high-speed low-power-consumption optocoupler communicating circuit, it is characterized in that: comprise an optocoupler OC1 and an optocoupler OC2; The anode of described optocoupler OC1 connects power supply VCC, the negative electrode of described optocoupler OC1 is connected with an end of a resistance R 1, the emitter of described optocoupler OC1 meets power supply VSS, the collector electrode of described optocoupler OC1 is connected as the signal output part OUT of described high-speed low-power-consumption optocoupler communicating circuit and with the emitter of described optocoupler OC2, the collector electrode of described optocoupler OC2 meets power vd D, the negative electrode of described optocoupler OC2 meets power supply GND, the anode of described optocoupler OC2 is connected with an end of a resistance R 2, the other end of described resistance R 1 is connected as the signal input part IN of described high-speed low-power-consumption optocoupler communicating circuit and with the other end of described resistance R 2, be parallel with a capacitor C 1 on the two ends of described resistance R 1, be parallel with a capacitor C 2 on the two ends of described resistance R 2.
In each embodiment of the utility model, capacitor C 1 and capacitor C 2 are speed-up capacitor.Trailing edge (or rising edge) in the upset of IN incoming level, utilize capacitor C 1(or capacitor C 2) instantaneous large-current in when charging and flow through corresponding resistance R 1(or resistance R 2) little electric current, make corresponding optocoupler OC1(or optocoupler OC2) phototriode conducting as early as possible, finish the upset of OUT output level; While capacitor C 2(or capacitor C 1) begin by resistance R 2(or resistance R 1) charging voltage since level upset last time is discharged, for upset next time is got ready.When capacitor C 1(or capacitor C 2) after charging finishes, corresponding resistance R 1(or resistance R 2) be optocoupler OC1(or optocoupler OC2) light-emitting diode little electric current is provided, be used for keeping the stable of upset back OUT output level.In the practical application, get the same shelves of C1=C2, R1=R2, OC1 and OC2 same model and CTR usually.
In each embodiment of the utility model, output OUT is the output of isolation in the same way of input IN, if will realize reverse isolation output, it is characterized in that: the light-emitting diode of described optocoupler OC1 and the light-emitting diode of described optocoupler OC2 are exchanged, or the phototriode of described optocoupler OC1 and the phototriode of described optocoupler OC2 are exchanged.
As shown in Figure 2, in the present embodiment, also comprise a diode D1 and a diode D2; The anode of described diode D1 connects the negative electrode of described optocoupler OC1, and the negative electrode of described diode D1 connects the anode of described optocoupler OC1; The anode of described diode D2 connects the negative electrode of described optocoupler OC2, and the negative electrode of described diode D2 connects the anode of described optocoupler OC2.
It is that described capacitor C 1 and capacitor C 2 are discharged that described diode D1 and diode D2 are used in the discharge preparatory stage, compares by described resistance R 1 and resistance R 2 discharges, will shorten the discharge preparatory stage greatly, can further improve the baud rate of communication.
As shown in Figure 3, in the present embodiment, also comprise a dead band current-limiting resistance R3; Described resistance R 3 one ends connect the emitter of described optocoupler OC1, and described resistance R 3 other ends connect power supply VSS.
As shown in Figure 4, in the present embodiment, also comprise a dead band current-limiting resistance R3; Described resistance R 3 one ends connect the collector electrode of described optocoupler OC1, and described resistance R 3 other ends connect the signal output part OUT of high-speed low-power-consumption optocoupler communicating circuit.
As shown in Figure 5, in the present embodiment, also comprise a dead band current-limiting resistance R3; Described resistance R 3 one ends connect the emitter of described optocoupler OC2, and described resistance R 3 other ends connect the signal output part OUT of high-speed low-power-consumption optocoupler communicating circuit.
As shown in Figure 6, in the present embodiment, also comprise a dead band current-limiting resistance R3; Described resistance R 3 one ends connect the collector electrode of described optocoupler OC2, and described resistance R 3 other ends connect power vd D.
Because the phototriode of optocoupler also has the storage effect of common triode, particularly when underload, the T of optocoupler
OFFTime is longer.When the IN incoming level overturns, because the effect T of speed-up capacitor
ONTime ratio T
OFFTime is short a lot, the situation of optocoupler OC1 and optocoupler OC2 conducting simultaneously will occur, usually moment several milliamperes to tens milliamperes approximately in dead band electric current (depending primarily on the CTR parameter of momentary charge electric current and the optocoupler of electric capacity).Increase resistance R 3 and can limit the dead band electric current, if power filtering capacitor is enough big, perhaps do not mind the power supply ripple that the dead band electric current brings, can short-circuit resistance R3.
As shown in Figure 7, for the ease of analyzing the operation principle of present embodiment, the output equivalent circuit of the digital circuit of having drawn in the frame of broken lines among the figure.The output of digital circuit drives the signal input part IN of high-speed low-power-consumption optocoupler communicating circuit as drive source.The output equivalent circuit of described digital circuit comprises a switch S H, a resistance R H, a resistance R L and a switch S L; The end of described switch S H connects power supply VCC, the other end of described switch S H connects the end of described resistance R H, the other end of described resistance R H is as the output of the output equivalent circuit of described digital circuit and connect the end of described resistance R L, the other end of described resistance R L connects the end of described switch S L, another termination power GND of described switch S L.During the digital circuit output low level, SL conducting SH disconnects, and internal resistance is RL; During digital circuit output high level, SH conducting SL disconnects, and internal resistance is RH.In the present embodiment, described high-speed low-power-consumption optocoupler communicating circuit comprises an optocoupler OC1 and an optocoupler OC2; The anode of described optocoupler OC1 connects power supply VCC, the negative electrode of described optocoupler OC1 is connected with an end of a resistance R 1, the emitter of described optocoupler OC1 meets power supply VSS, the collector electrode of described optocoupler OC1 is connected as the signal output part OUT of described high-speed low-power-consumption optocoupler communicating circuit and with the emitter of described optocoupler OC2, the collector electrode of described optocoupler OC2 meets power vd D, the negative electrode of described optocoupler OC2 meets power supply GND, the anode of described optocoupler OC2 is connected with an end of a resistance R 2, and the other end of described resistance R 1 connects an end of a resistance R 5; The other end of described resistance R 2 connects an end of a resistance R 6; The other end of described resistance R 5 connects the other end of described resistance R 6 and an end of a resistance R 4; The other end of described resistance R 4 is as the signal input part IN of described high-speed low-power-consumption optocoupler communicating circuit; Be parallel with a capacitor C 1 on the two ends of described resistance R 1, be parallel with a capacitor C 2 on the two ends of described resistance R 2.
Described resistance R 4, resistance R 5 and resistance R 6, short circuit one of them or two.Wherein, the resistance value of resistance R 4, R5 and R6 can be that 0(is short circuit), according to the situation of peripheral circuit in the practical application, form specifically combination.If be necessary, R4 can be used to limit the IN input upset maximum current of moment.If RL+R5 and RH+R6 are enough big, reached the current limliting purpose, also can short circuit R4.If the RL in the output equivalent circuit of digital circuit and RH basically identical also can while short circuit R5 and R6.If RL and RH in the output equivalent circuit of digital circuit are inconsistent, just can be with R5 and R6 balance RL and RH inconsistent, make RL+R5 ≈ RH+R6; Also can short circuit R5, make RL ≈ RH+R6; Also can short circuit R6, make RL+R5 ≈ RH.
The utility model is in concrete application process, can be in the technical scheme (as shown in Figure 7) of the technical scheme (as Fig. 3, Fig. 4, Fig. 5, shown in Figure 6) of the technical scheme (as shown in Figure 2) of two diode D1 of embodiment circuit base shown in Figure 1 stack and D2, dead band current-limiting resistance R3, current limliting balance resistance R4, R5, R6, and with in the light-emitting diode of described two optocoupler OC1 and OC2 or the technical scheme that phototriode is exchanged mutually one or more, thereby effectively satisfy various application demands.
Above-listed preferred embodiment; the purpose of this utility model, technical scheme and advantage are further described; institute is understood that; the above only is preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (8)
1. a high-speed low-power-consumption optocoupler communicating circuit is characterized in that: comprise an optocoupler OC1 and an optocoupler OC2; The anode of described optocoupler OC1 connects power supply VCC, the negative electrode of described optocoupler OC1 is connected with an end of a resistance R 1, the emitter of described optocoupler OC1 meets power supply VSS, the collector electrode of described optocoupler OC1 is connected as the signal output part OUT of described high-speed low-power-consumption optocoupler communicating circuit and with the emitter of described optocoupler OC2, the collector electrode of described optocoupler OC2 meets power vd D, the negative electrode of described optocoupler OC2 meets power supply GND, the anode of described optocoupler OC2 is connected with an end of a resistance R 2, the other end of described resistance R 1 is connected as the signal input part IN of described high-speed low-power-consumption optocoupler communicating circuit and with the other end of described resistance R 2, be parallel with a capacitor C 1 on the two ends of described resistance R 1, be parallel with a capacitor C 2 on the two ends of described resistance R 2.
2. high-speed low-power-consumption optocoupler communicating circuit according to claim 1 is characterized in that: also comprise a diode D1 and a diode D2; The anode of described diode D1 connects the negative electrode of described optocoupler OC1, and the negative electrode of described diode D1 connects the anode of described optocoupler OC1; The anode of described diode D2 connects the negative electrode of described optocoupler OC2, and the negative electrode of described diode D2 connects the anode of described optocoupler OC2.
3. high-speed low-power-consumption optocoupler communicating circuit according to claim 1 and 2 is characterized in that: also comprise a dead band current-limiting resistance R3; Described resistance R 3 one ends connect the emitter of described optocoupler OC1, and described resistance R 3 other ends connect power supply VSS; Perhaps described resistance R 3 one ends connect the collector electrode of described optocoupler OC1, and described resistance R 3 other ends connect the signal output part OUT of high-speed low-power-consumption optocoupler communicating circuit; Perhaps described resistance R 3 one ends connect the emitter of described optocoupler OC2, and described resistance R 3 other ends connect the signal output part OUT of high-speed low-power-consumption optocoupler communicating circuit; Perhaps described resistance R 3 one ends connect the collector electrode of described optocoupler OC2, and described resistance R 3 other ends connect power vd D.
4. high-speed low-power-consumption optocoupler communicating circuit according to claim 3 is characterized in that: also comprise a resistance R 4, a resistance R 5 and a resistance R 6; One end of described resistance R 4 is as the signal input part IN of described high-speed low-power-consumption optocoupler communicating circuit, the other end of described resistance R 4 connects an end of described resistance R 5 and resistance R 6, the other end of described resistance R 5 connects the other end of described resistance R 1, and the other end of described resistance R 6 connects the other end of described resistance R 2.
5. high-speed low-power-consumption optocoupler communicating circuit according to claim 4 is characterized in that: described resistance R 4, resistance R 5 and resistance R 6, short circuit one of them or two.
6. high-speed low-power-consumption optocoupler communicating circuit according to claim 1 and 2 is characterized in that: also comprise a resistance R 4, a resistance R 5 and a resistance R 6; One end of described resistance R 4 is as the signal input part IN of described high-speed low-power-consumption optocoupler communicating circuit, the other end of described resistance R 4 connects an end of described resistance R 5 and resistance R 6, the other end of described resistance R 5 connects the other end of described resistance R 1, and the other end of described resistance R 6 connects the other end of described resistance R 2.
7. high-speed low-power-consumption optocoupler communicating circuit according to claim 6 is characterized in that: described resistance R 4, resistance R 5 and resistance R 6, short circuit one of them or two.
8. high-speed low-power-consumption optocoupler communicating circuit according to claim 1, it is characterized in that: the light-emitting diode of described optocoupler OC1 and the light-emitting diode of described optocoupler OC2 are exchanged, or the phototriode of described optocoupler OC1 and the phototriode of described optocoupler OC2 are exchanged.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320125234 CN203180889U (en) | 2013-03-19 | 2013-03-19 | High-speed low-power opto-coupler communication circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320125234 CN203180889U (en) | 2013-03-19 | 2013-03-19 | High-speed low-power opto-coupler communication circuit |
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| CN203180889U true CN203180889U (en) | 2013-09-04 |
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| CN 201320125234 Expired - Lifetime CN203180889U (en) | 2013-03-19 | 2013-03-19 | High-speed low-power opto-coupler communication circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104388A (en) * | 2014-08-01 | 2014-10-15 | 新誉集团有限公司 | Analog-to-digital conversion circuit |
-
2013
- 2013-03-19 CN CN 201320125234 patent/CN203180889U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104388A (en) * | 2014-08-01 | 2014-10-15 | 新誉集团有限公司 | Analog-to-digital conversion circuit |
| CN104104388B (en) * | 2014-08-01 | 2017-06-13 | 新誉集团有限公司 | Analog to digital conversion circuit |
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Granted publication date: 20130904 |