CN102377395A - Single-channel signal isolating and amplifying device - Google Patents
Single-channel signal isolating and amplifying device Download PDFInfo
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- CN102377395A CN102377395A CN2011102276879A CN201110227687A CN102377395A CN 102377395 A CN102377395 A CN 102377395A CN 2011102276879 A CN2011102276879 A CN 2011102276879A CN 201110227687 A CN201110227687 A CN 201110227687A CN 102377395 A CN102377395 A CN 102377395A
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Abstract
The invention provides a single-channel signal isolating and amplifying device. The single-channel signal isolating and amplifying device comprises a signal isolating module, a signal adjusting module and a power supply converting module, wherein a measured voltage of an external circuit passes through the signal isolating module to obtain a second voltage and a differential signal, the differential signal is adjusted through the signal adjusting module to form a single signal, and the single signal is measured by using an instrument to finish measurement on a voltage to be measured. The single-channel signal isolating and amplifying device provided by the invention has a good heat radiating effect, high safety performance and small size and is convenient to carry.
Description
Technical field
The present invention relates to a kind of Signal Spacing amplifying device, relate in particular to a kind of single channel signal and isolate amplifying device.
Background technology
Signal Isolation Technology is to make analog signal when sending, not exist the electric current that passes through barrier between transmission and the receiving unit to connect.This allow to send can be up to several kilovolts with the difference of receiving unit ground or reference level outward, and prevented to damage the loop current between the different earth potentials of signal, and the noise of signal ground can make signal impaired.Isolation can make Signal Separation to a clean subsystem ground between instrument and meter or control system and the power supply and isolate each other, thus the work safety of assurance whole system device, reliable and stable.The measurement of some high-tension circuit voltages since its high pressure can not directly measure with instrument, so must adopt Signal Spacing amplification to carry out the step-down and the isolation of voltage to be measured, and the low-voltage signal that obtains with instrument measurement.
The Signal Spacing device depends on no transmitter and receiver is crossed over isolation barrier, and this device once was used for digital signal, realizes but linearization problem forces analog signal to isolate devices such as adopting transformer, photoelectrical coupler electric capacity or photocell.At present on the market the general volume of Signal Spacing amplifier is bigger, and radiating effect with and security performance all have much room for improvement.
In view of this, be necessary to provide a kind of good heat dissipation effect, security performance is high, and the light and handy single channel signal of volume is isolated amplifying device.
Summary of the invention
To the deficiency of prior art, the object of the invention is to provide a kind of good heat dissipation effect, and the single channel signal that security performance is high is isolated amplifying device.
For solving the problems of the technologies described above, technical scheme of the present invention is achieved in that
A kind of single channel signal is isolated amplifying device; Said single channel signal is isolated amplifying device and comprised: the Signal Spacing module: said Signal Spacing module comprises a light-coupled isolation amplifier, and the importation of said light-coupled isolation amplifier connects the voltage to be measured of an external circuit; Signal adjusting module: the importation of said signal adjusting module is connected with described Signal Spacing module output; Power module: said power module comprises one first electric pressure converter and one second electric pressure converter; The importation of said power module is connected with an external power supply; The output of said first electric pressure converter is connected with said Signal Spacing module, and the output of said second voltage transformation module is connected with said signal adjusting module.
Further, said first electric pressure converter is exported a single-power voltage, and said second electric pressure converter is exported a dual-supply voltage, and said dual-supply voltage comprises positive voltage and negative voltage.
Further, the importation of said light-coupled isolation amplifier connects said single-power voltage, and the output of said light-coupled isolation amplifier connects the positive voltage in the said dual-supply voltage.
Further, also be connected with a tertiary voltage modular converter between the said Signal Spacing module and first voltage transformation module.
Further, said Signal Spacing module output is exported one second voltage.
Further, said voltage to be measured is higher than said second voltage.
Further, a differential signal is imported in said signal adjusting module importation, and output is exported a single signal.
Further, said signal adjusting module comprises operational amplifier OPA551.
Further, said single signal type comprises a direct current voltage or a constant-current source.
Further, it is characterized in that: said signal adjusting module comprises a jumper cap.
The invention has the beneficial effects as follows: single channel signal provided by the present invention is isolated the amplifying device good heat dissipation effect, and security performance is high, and volume is light and handy, is easy to carry.
Description of drawings
Fig. 1 is the circuit module block diagram that single channel signal is isolated amplifying device in the expression preferred implementation of the present invention.
Fig. 2 is the power module circuitry principle schematic that single channel signal is isolated amplifying device in the expression preferred implementation of the present invention.
Fig. 3 is the Signal Spacing modular circuit principle schematic that single channel signal is isolated amplifying device in the expression preferred implementation of the present invention.
Fig. 4 is the signal adjusting module circuit theory sketch map that single channel signal is isolated amplifying device in the expression preferred implementation of the present invention.
Embodiment
Below will combine accompanying drawing that a preferred implementation of the present invention is at large described.
Please with reference to Fig. 1; In this execution mode; Single channel signal provided by the present invention is isolated amplifying device and is comprised power module 10, Signal Spacing module 20 and signal adjusting module 30; Said power module 10 is exported one first supply power voltage respectively and is given said Signal Spacing module 20 power supplies; Export one second supply power voltage and give said signal adjusting module 30 power supplies, the importation of said Signal Spacing module 20 connects the voltage to be measured of an external circuit, and the importation of said signal adjusting module 30 is connected with described Signal Spacing module 20 outputs.
Please with reference to Fig. 2; An external power supply is imported in the importation of said power module 10; In this execution mode, said external power supply is direct current+24V, comprises one first electric pressure converter U1 and one second electric pressure converter U9 in the said power module 10; The output of the said first electric pressure converter U1 is connected with said Signal Spacing module 20, and the output of the said second voltage transformation module U9 is connected with said signal adjusting module 30.The said first electric pressure converter U1 is with direct current+24V conversion and export one first supply power voltage,
The single-power voltage VDD2 that said first supply power voltage is one+5V; The said second electric pressure converter U9 is with direct current+24V conversion and export one second supply power voltage; Said second supply power voltage is a dual-supply voltage, it comprises+and the negative voltage of the positive voltage of 12V and-12V.
Please with reference to Fig. 3 and Fig. 4; Said Signal Spacing module 20 comprises a light-coupled isolation amplifier U2; The single-power voltage VDD2 of power module 10 outputs connects the importation of said light-coupled isolation amplifier U2; Carry out the conditioning filtering of signal through magnetic bead Z3 and capacitor C 1, with 1 pin of its input light-coupled isolation amplifier U2, as the power supply of signal input; Said dual-supply voltage+positive voltage of 12V at first is connected to a tertiary voltage modular converter U4; Said tertiary voltage modular converter converts the positive voltage of said+12V+5V voltage into; Carry out the conditioning filtering of signal through magnetic bead Z1 and capacitor C 5 then, be connected to the output of said light-coupled isolation amplifier U2 through tertiary voltage modular converter U4 after the conditioning filtering.Be specially 8 pin that are entered into light-coupled isolation amplifier U2, as the power supply of signal output; 4 pin GND1 and 5 pin GND2 insert subsystem ground separately respectively; The voltage to be measured that said light-coupled isolation amplifier U2 will import is one second voltage through zooming in or out, and importation voltage signal and output voltage signal are isolated, shown in output voltage be a differential signal.In this execution mode, said first voltage is a high-voltage signal, and second voltage is a low-voltage signal, is used to measure the magnitude of voltage of high-tension circuit, and certainly, in other embodiments, said first voltage also can be a low-voltage signal, and second voltage is a high-voltage signal.
As shown in Figure 3; In this execution mode; Particularly, the isolation amplifying device 2 pin VIN+ and the 3 pin VIN-of described Signal Spacing module insert said voltage to be measured, and said light-coupled isolation amplifier U2 is chip HCPL7840; Its measuring-signal is+/-200mv (accurate and linear), maximum can reach+/-2v (functional); 6 pin Vout-and 7 pin Vout+ export said differential signal, realize thus converting measured voltage signal to measurable Low Voltage Differential Signal.
Please with reference to Fig. 3 and Fig. 4; Said signal adjusting module adopts an operational amplifier U8; It is chip OPA551, said dual-supply voltage+/-12V is to chip OPA551 power supply, and the importation of said operational amplifier U8 is connected with described Signal Spacing module output; The importation signal of said operational amplifier U8 is the differential signal of preposition isolation module output, and serial connection goes up R4, R5 to do current limliting respectively.Output is selected the single signal type of output through jumper cap J4; Signal type can be direct voltage or constant-current source; Can select to be output as direct voltage or be output as constant-current source through jumper cap J4; When being output as constant-current source, constitute suspension load voltage Control current source circuit, so far differential signal is adjusted to single signal.The precision of said chip OPA551 is higher, and the general operational amplifier of this chip cooling performance is good, so adopt this OPA551 as signal adjusting module; Can realize that whole isolated amplifying device certainty of measurement is higher, its heat dispersion has also guaranteed whole security performance and useful life, in addition; The components and parts volume of this isolation amplifying device is all less; Circuit-board laying-out is also comparatively reasonable, has guaranteed that taking up room of this product is very little, is easy to carry very much.
Although be the example purpose; Preferred implementation of the present invention is disclosed; But those of ordinary skill in the art will recognize, under the situation that does not break away from disclosed scope of the present invention and spirit by appending claims, various improvement, increase and replacement are possible.
Claims (10)
1. single channel signal is isolated amplifying device, it is characterized in that, said single channel signal is isolated amplifying device and comprised:
The Signal Spacing module: said Signal Spacing module comprises a light-coupled isolation amplifier, and the importation of said light-coupled isolation amplifier connects the voltage to be measured of an external circuit;
Signal adjusting module: the importation of said signal adjusting module is connected with described Signal Spacing module output;
Power module: said power module comprises one first electric pressure converter and one second electric pressure converter; The importation of said power module is connected with an external power supply; The output of said first electric pressure converter is connected with said Signal Spacing module, and the output of said second voltage transformation module is connected with said signal adjusting module.
2. single channel signal as claimed in claim 1 is isolated amplifying device, and it is characterized in that: said first electric pressure converter is exported a single-power voltage, and said second electric pressure converter is exported a dual-supply voltage, and said dual-supply voltage comprises positive voltage and negative voltage.
3. single channel signal as claimed in claim 2 is isolated amplifying device, and it is characterized in that: the importation of said light-coupled isolation amplifier connects said single-power voltage, and the output of said light-coupled isolation amplifier connects the positive voltage in the said dual-supply voltage.
4. single channel signal as claimed in claim 3 is isolated amplifying device, it is characterized in that: also be connected with a tertiary voltage modular converter between the said Signal Spacing module and first voltage transformation module.
5. single channel signal as claimed in claim 1 is isolated amplifying device, and it is characterized in that: said Signal Spacing module output is exported one second voltage.
6. single channel signal as claimed in claim 5 is isolated amplifying device, and it is characterized in that: said voltage to be measured is higher than said second voltage.
7. single channel signal as claimed in claim 1 is isolated amplifying device, and it is characterized in that: a differential signal is imported in said signal adjusting module importation, and output is exported a single signal.
8. single channel signal as claimed in claim 1 is isolated amplifying device, and it is characterized in that: said signal adjusting module comprises operational amplifier OPA551.
9. single channel signal as claimed in claim 8 is isolated amplifying device, and it is characterized in that: said single signal type comprises a direct current voltage or a constant-current source.
10. single channel signal as claimed in claim 9 is isolated amplifying device, and it is characterized in that: said signal adjusting module comprises a jumper cap.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102276879A CN102377395A (en) | 2011-08-10 | 2011-08-10 | Single-channel signal isolating and amplifying device |
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| CN2011102276879A CN102377395A (en) | 2011-08-10 | 2011-08-10 | Single-channel signal isolating and amplifying device |
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| CN102377395A true CN102377395A (en) | 2012-03-14 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201072859Y (en) * | 2007-07-03 | 2008-06-11 | 河南辉煌科技股份有限公司 | Signal isolating and amplifying circuit module |
| CN201341115Y (en) * | 2008-11-05 | 2009-11-04 | 中国北车股份有限公司大连电力牵引研发中心 | Isolation amplification circuit of alternating-current analog electrical signal based on linear optical coupler |
| US20100176788A1 (en) * | 2009-01-13 | 2010-07-15 | Foxnum Technology Co., Ltd. | Current detecting apparatus |
| CN202183755U (en) * | 2011-08-10 | 2012-04-04 | 苏州凌创电子科技有限公司 | Single-channel signal isolation amplifier |
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2011
- 2011-08-10 CN CN2011102276879A patent/CN102377395A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201072859Y (en) * | 2007-07-03 | 2008-06-11 | 河南辉煌科技股份有限公司 | Signal isolating and amplifying circuit module |
| CN201341115Y (en) * | 2008-11-05 | 2009-11-04 | 中国北车股份有限公司大连电力牵引研发中心 | Isolation amplification circuit of alternating-current analog electrical signal based on linear optical coupler |
| US20100176788A1 (en) * | 2009-01-13 | 2010-07-15 | Foxnum Technology Co., Ltd. | Current detecting apparatus |
| CN202183755U (en) * | 2011-08-10 | 2012-04-04 | 苏州凌创电子科技有限公司 | Single-channel signal isolation amplifier |
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Application publication date: 20120314 |