CN104991498A - Input/output isolation circuit - Google Patents
Input/output isolation circuit Download PDFInfo
- Publication number
- CN104991498A CN104991498A CN201510408579.XA CN201510408579A CN104991498A CN 104991498 A CN104991498 A CN 104991498A CN 201510408579 A CN201510408579 A CN 201510408579A CN 104991498 A CN104991498 A CN 104991498A
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- CN
- China
- Prior art keywords
- input end
- input
- switch
- accumulator
- output terminal
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25314—Modular structure, modules
Abstract
The invention relates to an input/output isolation circuit which comprises an input end switch, a microcontroller, an energy storage device and an output end switch. The input end switch is connected to the input end of the energy storage device; the output end switch is connected to the output end of the energy storage device; the microcontroller is electrically connected with the input end switch and the output end switch; the microcontroller controls the input end switch to close and the output end switch to open simultaneously and keeps the states for a first preset time to control the energy storage device to be charged, wherein the first preset time is larger than the fully-charged time of the energy storage device; and the microcontroller controls the input end switch to open and the output end switch to close simultaneously to control the energy storage device to be discharged. The input/output isolation circuit can isolate digital signals or analog signals, is simple in circuit structure, is low in cost, is good in isolation performance, and is higher in isolation degree than the isolation degree obtained through other schemes of optical coupler isolation and magnetic isolation and the like.
Description
Technical field
The present invention relates to circuit engineering field, be specifically related to a kind of input and output buffer circuit.
Background technology
In available circuit, the isolation of input and output mainly adopts light-coupled isolation and Magnetic isolation two kinds of modes.Wherein, the shortcoming of light-coupled isolation is: one, be only applicable to digital signal isolation, and for simulating signal, especially direct current AI input signal, can not isolate with common optical coupler; Two, linear optical coupling can be used to isolate for direct current AI signal, but linear optical coupling is very expensive, price is tens times of common optical coupler, and such as HCNR200 price is 10 yuan, and PC817 only needs 0.4 yuan, and the non-constant of precision.The shortcoming of Magnetic isolation is: one, compare and be applicable to digital signal and the isolation exchanging AI signal, general Magnetic isolation relies on the law of electromagnetic induction, miniature transformer is used to carry out isolating, the icouple technology of such as ADI and the uModule technology of Linear, all only adapt to and digital signal and the isolation exchanging AI signal, be not suitable for the isolation of direct current AI signal; Two, arbitrary Magnetic isolation device all costly.
Summary of the invention
The object of the invention is to, proposing one can either isolate digital signal, also can isolation mode analog signal, and the input and output buffer circuit of advantage of lower cost.
A kind of input and output buffer circuit that the present invention proposes, it comprises input end switch device, microcontroller, accumulator and output terminal derailing switch; Described input end switch device is connected to the input end of described accumulator, and described output terminal derailing switch is connected to the output terminal of described accumulator, and described microcontroller is electrically connected with described input end switch device and output terminal derailing switch respectively; Described microcontroller controls that described input end switch device is closed, described output terminal derailing switch is opened, and kept the first Preset Time, to control described charging accumulator simultaneously; Described first Preset Time is greater than the time that described accumulator is full of; Described microcontroller controls that described input end switch device is opened simultaneously, described output terminal derailing switch closes, to control the electric discharge of described accumulator.
Preferably, described charging accumulator and inter-spike intervals second Preset Time.
Preferably, described input end switch device comprises the first derailing switch and second switch device, on the positive pole being connected to described accumulator input end and negative pole; Described output terminal derailing switch comprises the 3rd derailing switch and the 4th derailing switch, on the positive pole being connected to described accumulator output terminal and negative pole; Described microcontroller is electrically connected with described first derailing switch, second switch device, the 3rd derailing switch and the 4th derailing switch respectively.
Preferably, described input end switch device and output terminal derailing switch are analog switch.
Preferably, described input end switch device and output terminal derailing switch are light coupling relay.
Preferably, described input end switch device and output terminal derailing switch are signal relay.
Preferably, described accumulator is specially electric capacity.
Preferably, described accumulator is specially inductance.
Preferably, described accumulator is specially electric capacity and resistant series combination.
The present invention at least has following beneficial effect:
1, both digital signal can be isolated, also can isolation mode analog signal.
2, only relate to some derailing switches, accumulator and microcontroller, circuit structure is simple, and cost is lower.
3, isolation performance is good, and compared with other light-coupled isolation, Magnetic isolation scheme, the isolation of this isolation scheme is higher.
Accompanying drawing explanation
Fig. 1 is the modular construction connection layout of a kind of input and output buffer circuit that the embodiment of the present invention proposes.
Fig. 2 is the schematic diagram of a kind of input and output buffer circuit that the embodiment of the present invention proposes.
Embodiment
For the ease of it will be appreciated by those skilled in the art that the present invention is described further below in conjunction with accompanying drawing and embodiment.
Refer to Fig. 1, a kind of input and output buffer circuit that the present embodiment proposes, comprise input end switch device 10, microcontroller 40, accumulator 30 and output terminal derailing switch 20; Described input end switch device 10 is connected to the input end of described accumulator 30, and described output terminal derailing switch 20 is connected to the output terminal of described accumulator 30, and described microcontroller 40 is electrically connected with described input end switch device 10 and output terminal derailing switch 20 respectively; In use, described microcontroller 40 controls that described input end switch device 10 is closed, described output terminal derailing switch 20 is opened, and kept the first Preset Time simultaneously, charges to control described accumulator 30; Described first Preset Time is greater than the time that described accumulator 30 is full of; Described microcontroller 40 controls that described input end switch device 10 is opened simultaneously, described output terminal derailing switch 20 closes, and discharges to control described accumulator 30.
In the present embodiment, described input end switch device 10 and output terminal derailing switch 20 can be all the one in the switching devices such as analog switch, light coupling relay, signal relay.Described accumulator 30 can be specifically the combination of electric capacity, inductance, electric capacity and resistant series or other can be a kind of in the circuit component of fast charging and discharging.
Below by way of an application example, principle of work is described in detail.
Please continue to refer to Fig. 2, described input end switch device 10 specifically comprises the first derailing switch 11 and second switch device 12, on the positive pole being connected to described accumulator 30 input end and negative pole; Described output terminal derailing switch 20 specifically comprises the 3rd derailing switch 21 and the 4th derailing switch 22, on the positive pole being connected to described accumulator 30 output terminal and negative pole, described microcontroller 40 is electrically connected with the first derailing switch 11, second switch device 12, the 3rd derailing switch 21 and the 4th derailing switch 22 respectively.
Before use, the input of the first derailing switch 11 and second switch device 12 is connected in front stage circuits (scheming not shown), and the output of the 3rd derailing switch 21 and the 4th derailing switch 22 is connected in late-class circuit (scheming not shown).
During use, described microcontroller 40 controls the first derailing switch 11 and second switch device 12 closes, and control the 3rd derailing switch 21 and the 4th derailing switch 22 are opened simultaneously, then accumulator 30 enters charge mode; During charging, the closure state of the first derailing switch 11 and second switch device 12 and the open mode of the 3rd derailing switch 21 and the 4th derailing switch 22 need keep the first Preset Time, this first Preset Time need be greater than the time that described accumulator 30 is full of, otherwise electricity is not full of, measuring accuracy can be greatly affected.The time that the concrete time value of this first Preset Time can be full of according to accumulator 30 presets.
After accumulator 30 is full of electricity, described microcontroller 40 controls the first derailing switch 11 and second switch device 12 is opened, and control the 3rd derailing switch 21 and the 4th derailing switch 22 are closed simultaneously, then accumulator 30 enters discharge mode; Now the output terminal Uo of buffer circuit is equal with the value of input end Ui, but both are completely isolated.
It should be noted that electric discharge and the charging of accumulator 30 need separated in time (the second Preset Time); This interval time can not be oversize, otherwise may cause accumulator 30 self discharge, cause the output voltage Uo of buffer circuit and input voltage Ui deviation excessive.Concrete time value can be preset according to adopted accumulator 30.
The present embodiment both can isolate digital signal, also can isolation mode analog signal, and it only relates to some derailing switches, accumulator and microcontroller, and circuit structure is simple, and cost is lower.In addition, the present embodiment isolation performance is good, and the isolation compared with other schemes such as light-coupled isolation, Magnetic isolation wants high.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (9)
1. an input and output buffer circuit, is characterized in that, comprises input end switch device, microcontroller, accumulator and output terminal derailing switch; Described input end switch device is connected to the input end of described accumulator, and described output terminal derailing switch is connected to the output terminal of described accumulator, and described microcontroller is electrically connected with described input end switch device and output terminal derailing switch respectively; Described microcontroller controls that described input end switch device is closed, described output terminal derailing switch is opened, and kept the first Preset Time, to control described charging accumulator simultaneously; Described first Preset Time is greater than the time that described accumulator is full of; Described microcontroller controls that described input end switch device is opened simultaneously, described output terminal derailing switch closes, to control the electric discharge of described accumulator.
2. input and output buffer circuit according to claim 1, is characterized in that, described charging accumulator and inter-spike intervals second Preset Time.
3. input and output buffer circuit according to claim 1, is characterized in that, described input end switch device comprises the first derailing switch and second switch device, on the positive pole being connected to described accumulator input end and negative pole; Described output terminal derailing switch comprises the 3rd derailing switch and the 4th derailing switch, on the positive pole being connected to described accumulator output terminal and negative pole; Described microcontroller is electrically connected with described first derailing switch, second switch device, the 3rd derailing switch and the 4th derailing switch respectively.
4. input and output buffer circuit according to claim 1, is characterized in that, described input end switch device and output terminal derailing switch are analog switch.
5. input and output buffer circuit according to claim 1, is characterized in that, described input end switch device and output terminal derailing switch are light coupling relay.
6. input and output buffer circuit according to claim 1, is characterized in that, described input end switch device and output terminal derailing switch are signal relay.
7. input and output buffer circuit according to claim 1, is characterized in that, described accumulator is specially electric capacity.
8. input and output buffer circuit according to claim 1, is characterized in that, described accumulator is specially inductance.
9. input and output buffer circuit according to claim 1, is characterized in that, described accumulator is specially electric capacity and resistant series combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510408579.XA CN104991498A (en) | 2015-07-10 | 2015-07-10 | Input/output isolation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510408579.XA CN104991498A (en) | 2015-07-10 | 2015-07-10 | Input/output isolation circuit |
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| Publication Number | Publication Date |
|---|---|
| CN104991498A true CN104991498A (en) | 2015-10-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510408579.XA Pending CN104991498A (en) | 2015-07-10 | 2015-07-10 | Input/output isolation circuit |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85100641A (en) * | 1985-04-01 | 1986-07-16 | 周仕元 | Capacitive power supply |
| CN1031632A (en) * | 1987-08-05 | 1989-03-08 | 雅达电子有限公司 | Isolated analog voltage sense circuit |
| CN200990564Y (en) * | 2006-11-08 | 2007-12-12 | 常德洪安贸易有限公司 | Isolated power source capable of avoiding generation of electric shock accident |
| US20080317106A1 (en) * | 2004-06-03 | 2008-12-25 | Silicon Laboratories Inc. | Mcu with integrated voltage isolator and integrated galvanically isolated asynchronous serial data link |
| CN202340135U (en) * | 2011-11-23 | 2012-07-18 | 上海步科自动化有限公司 | Analogue signal isolation device |
| CN203385782U (en) * | 2013-08-09 | 2014-01-08 | 广州龙之杰科技有限公司 | Non-transformer isolated voltage and current acquisition device |
-
2015
- 2015-07-10 CN CN201510408579.XA patent/CN104991498A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85100641A (en) * | 1985-04-01 | 1986-07-16 | 周仕元 | Capacitive power supply |
| CN1031632A (en) * | 1987-08-05 | 1989-03-08 | 雅达电子有限公司 | Isolated analog voltage sense circuit |
| US20080317106A1 (en) * | 2004-06-03 | 2008-12-25 | Silicon Laboratories Inc. | Mcu with integrated voltage isolator and integrated galvanically isolated asynchronous serial data link |
| CN200990564Y (en) * | 2006-11-08 | 2007-12-12 | 常德洪安贸易有限公司 | Isolated power source capable of avoiding generation of electric shock accident |
| CN202340135U (en) * | 2011-11-23 | 2012-07-18 | 上海步科自动化有限公司 | Analogue signal isolation device |
| CN203385782U (en) * | 2013-08-09 | 2014-01-08 | 广州龙之杰科技有限公司 | Non-transformer isolated voltage and current acquisition device |
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Application publication date: 20151021 |
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