CN202583298U - Alternating current voltage isolated sampling circuit - Google Patents
Alternating current voltage isolated sampling circuit Download PDFInfo
- Publication number
- CN202583298U CN202583298U CN 201220156435 CN201220156435U CN202583298U CN 202583298 U CN202583298 U CN 202583298U CN 201220156435 CN201220156435 CN 201220156435 CN 201220156435 U CN201220156435 U CN 201220156435U CN 202583298 U CN202583298 U CN 202583298U
- Authority
- CN
- China
- Prior art keywords
- resistance
- circuit
- amplifier circuit
- electric capacity
- positive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model relates to an alternating current voltage isolated sampling circuit which comprises a commercial power input module, a full-wave rectification circuit, a voltage division filter circuit, a differential isolation amplifying circuit, and a secondary differential amplifying circuit. The commercial power input module is connected to the full-wave rectification circuit. An output of the full-wave rectification circuit is connected to the voltage division filter circuit. A positive output terminal of the voltage division filter circuit is connected to a differential signal negative input terminal of the differential isolation amplifying circuit. A negative output terminal of the voltage division filter circuit is connected to a differential signal positive input terminal of the differential isolation amplifying circuit. A positive output terminal of the differential isolation amplifying circuit is connected to a differential signal negative input terminal of the secondary differential amplifying circuit. A differential signal negative output terminal of the differential isolation amplifying circuit is connected to a positive input terminal of the secondary differential amplifying circuit. An output terminal of the secondary differential amplifying circuit is a voltage detection terminal. The sampling circuit has the characteristics of a small loop area, anti-interference, good linearity, small temperature drift, and high precision.
Description
Technical field
The utility model relates to the alternating voltage sample circuit, a kind of alternating voltage sample circuit with buffer action of more specifically saying so.
Background technology
Alternating voltage sampling at present adopts AC transformer to isolate the technology of sampling usually; AC transformer is as the core devices of AC sampling; Because ac rated voltage is generally 220VAC; Belong to the high voltage appearance grade, the elementary winding of transformer just needs bigger induction reactance to be allowed the current requirements that passes through to satisfy the winding wire bag under the identical situation in online footpath, magnetic core specification, and the induction reactance that increases transformer is taked following two kinds of methods usually: 1, the increase number of turn; 2, strengthen magnetic core.Adopt these two kinds of methods to increase the induction reactance of transformer, can increase the volume of transformer, and increase after the number of turn the having relatively high expectations of technique for coiling, leakage inductance is the linearity of affects sampling circuit too.Simultaneously; The technology that AC transformer is isolated sampling possibly demonstrate nonlinear state along with the variation of frequency to the alternating voltage sampled value; It mainly is the linearity that depends on isolating transformer; If the linearity that will improve transformer then need increase the volume of transformer greatly, be unfavorable for the portable and miniaturized design of product.
Summary of the invention
For fear of above-mentioned existing in prior technology weak point, the utility model provides a kind of and has that loop area is little, the linearity is number good, temperature is floated alternating voltages little, the high characteristics of precision and isolated sample circuits.
The utility model technical solution problem; Be to adopt following scheme: a kind of alternating voltage is isolated sample circuit; Comprise civil power load module, full-wave rectifying circuit, pressure filter circuit, difference isolating amplifier circuit, secondary differential amplifier circuit; It is characterized in that: said civil power load module is connected to full-wave rectifying circuit; The output of full-wave rectifying circuit is connected to pressure filter circuit; The positive output end of pressure filter circuit is connected to the differential signal negative input end of difference isolating amplifier circuit, and the negative output terminal of pressure filter circuit is connected to the differential signal positive input terminal of difference isolating amplifier circuit, and the positive output end of difference isolating amplifier circuit is connected to the negative input end of secondary differential amplifier circuit; The differential signal negative output terminal of difference isolating amplifier circuit is connected to the positive input terminal of secondary differential amplifier circuit, and the output terminal of secondary differential amplifier circuit is the voltage detecting end.
In the utility model one embodiment, said civil power load module is a single-phase alternating current.
In the utility model one embodiment, said full-wave rectifying circuit is made up of rectifier bridge parallel connection first resistance.
In the utility model one embodiment; Said pressure filter circuit comprises second resistance, the 3rd resistance, the 4th resistance, first electric capacity, second electric capacity; The negative output terminal of full-wave rectifying circuit is connected to an end of second resistance; The other end of second resistance is connected to an end of the 3rd resistance, the negative pole of first electric capacity respectively; The other end of the 3rd resistance is connected to an end of the 4th resistance, the negative pole of second electric capacity, the differential signal positive input terminal of difference isolating amplifier circuit respectively, and the positive output end of full-wave rectifying circuit is connected to the positive pole of first electric capacity, the other end of the 4th resistance, the positive pole of second electric capacity, the differential signal negative input end of difference isolating amplifier circuit respectively.
In the utility model one embodiment; Said secondary differential amplifier circuit comprises the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, adjustable resistance, diode, operational amplifier; One end of the 5th resistance is the negative input end of secondary differential amplifier circuit; The other end of the 5th resistance is connected to the negative input end of operational amplifier, an end of the 6th resistance respectively; The other end of the 6th resistance is connected to the output terminal of operational amplifier, an end of adjustable resistance, the adjustable end of adjustable resistance respectively, and an end of the 7th resistance is the positive input terminal of secondary differential amplifier circuit, and the other end of the 7th resistance is connected to the positive input terminal of operational amplifier, an end of the 8th resistance respectively; The other end ground connection of the 8th resistance; The other end of adjustable resistance is as the output terminal of secondary differential amplifier circuit and be connected to the positive pole of diode, an end of the 9th resistance respectively, and the negative pole of diode connects+the 5V direct supply, the other end ground connection of the 9th resistance.
In the utility model one embodiment, the secondary differential amplifier circuit also comprises the 3rd electric capacity, the 4th electric capacity, and said the 3rd electric capacity is connected in parallel on the two ends of the 6th resistance, and said the 4th electric capacity is connected in parallel on the two ends of the 8th resistance.
For the difference isolating amplifier circuit is effectively protected; In the utility model one embodiment; The differential signal input end of said difference isolating amplifier circuit parallel connection one two-way transient voltage restraining diode, prevent effectively to be struck by lightning or surging signal to the destruction of difference isolating amplifier circuit.
In the utility model one embodiment, the difference isolating amplifier circuit adopts chip AMC1200.
Compared with prior art, the utility model beneficial effect is embodied in:
(1) adopts linear isolating difference amplifier integrated chip; Solve AC sampling design of transformer of the prior art and difficulty of processing; Overcome the deficiency of poor linearity, this alternating voltage sample circuit is not exchanged the influence of incoming frequency, improves the overall sampling precision of alternating voltage effectively.
(2) dwindled the loop area of sampling circuit, had the advantages that cost is low, volume is little.
(3) adopt the two stage amplifer circuit, input impedance is big, and common-mode rejection ratio is high, can effectively suppress external interference signals, and antijamming capability is strong; Because two-stage adopts difference to amplify mode, can effectively avoid or reduce the device temperature and float the sampling error that causes, temperature is floated little.
(4) adopt bidirectional transient voltage to suppress the two ends that diode is connected in parallel on the differential signal input end of difference isolating amplifier circuit, effectively protect, prevent effectively to be struck by lightning or the destruction of surging signal.
Description of drawings
Fig. 1 is the theory diagram of the utility model.
Fig. 2 is the circuit diagram of an embodiment of the utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is described further so that those skilled in the art can better understand the utility model and implementing, but the embodiment that lifts not conduct to the qualification of the utility model.
Referring to accompanying drawing 1,2; The utility model alternating voltage is isolated sample circuit and is comprised civil power load module 1, full-wave rectifying circuit 2, pressure filter circuit 3, difference isolating amplifier circuit 4, secondary differential amplifier circuit 5; Civil power load module 1 is connected to full-wave rectifying circuit 2; The output of full-wave rectifying circuit 2 is connected to pressure filter circuit 3; The positive output end of pressure filter circuit 3 is connected to the differential signal negative input end In-of difference isolating amplifier circuit 4; The negative output terminal of pressure filter circuit 3 is connected to the differential signal positive input terminal In+ of difference isolating amplifier circuit 4; The differential signal positive output end Out+ of difference isolating amplifier circuit 4 is connected to the negative input end of secondary differential amplifier circuit 5, and the differential signal negative output terminal Out-of difference isolating amplifier circuit 5 is connected to the positive input terminal of secondary differential amplifier circuit 5, and the output terminal of secondary differential amplifier circuit 5 is the voltage detecting end.
Civil power load module 1 is a single-phase alternating current; Full-wave rectifying circuit 2 is made up of rectifier bridge parallel connection first resistance R 1 that four diodes of diode D1-D4 constitute; The positive output end of full-wave rectifying circuit 2 is connected to the positive pole of first capacitor C 1; Pressure filter circuit 3 comprises second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, first capacitor C 1, second capacitor C 2; The negative output terminal of full-wave rectifying circuit 2 is connected to an end of second resistance R 2; The other end of second resistance R 2 is connected to an end of the 3rd resistance R 3, the negative pole of first capacitor C 1 respectively; The other end of the 3rd resistance R 3 is connected to an end of the 4th resistance R 4, the negative pole of second capacitor C 2, the differential signal positive input terminal In+ of difference isolating amplifier circuit 4 respectively, and the positive output end of full-wave rectifying circuit 2 is connected to the positive pole of first capacitor C 1, the other end of the 4th resistance R 4, the positive pole of second capacitor C 2, the differential signal negative input end In-of difference isolating amplifier circuit 4 respectively.
Secondary differential amplifier circuit 5 comprises the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, adjustable resistance RP1, diode D6, operational amplifier IC2; One end of the 5th resistance R 5 is the negative input end of secondary differential amplifier circuit 5; The other end of the 5th resistance R 5 is connected to the negative input end of operational amplifier IC2, an end of the 6th resistance R 6 respectively; The other end of the 6th resistance R 6 is connected to the output terminal of operational amplifier IC2, the end of adjustable resistance RP1, the adjustable end of adjustable resistance RP1 respectively; The two ends of the 6th resistance R 6 are parallel with the 3rd capacitor C 3; One end of the 7th resistance R 7 is the positive input terminal of secondary differential amplifier circuit 5, and the other end of the 7th resistance R 7 is connected to the positive input terminal of operational amplifier IC2, an end of the 8th resistance R 8, the other end ground connection of the 8th resistance R 8 respectively; The two ends of the 8th resistance R 8 are parallel with the 4th capacitor C 4; The other end of adjustable resistance RP1 is as the output terminal of secondary differential amplifier circuit 5 and be connected to the positive pole of diode D6, an end of the 9th resistance R 9 respectively, and the negative pole of diode D6 connects+the 5V direct supply, the other end ground connection of the 9th resistance R 9.
In the present embodiment, the differential signal input end of difference isolating amplifier circuit 4 parallel connection one two-way transient voltage restraining diode D5, the difference isolating amplifier circuit is chip AMC1200.
The above is merely the preferred embodiment of the utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to the covering scope of the utility model.
Claims (8)
1. an alternating voltage is isolated sample circuit; Comprise civil power load module, full-wave rectifying circuit, pressure filter circuit, difference isolating amplifier circuit, secondary differential amplifier circuit; It is characterized in that: said civil power load module is connected to full-wave rectifying circuit; The output of full-wave rectifying circuit is connected to pressure filter circuit; The positive output end of pressure filter circuit is connected to the differential signal negative input end of difference isolating amplifier circuit, and the negative output terminal of pressure filter circuit is connected to the differential signal positive input terminal of difference isolating amplifier circuit, and the positive output end of difference isolating amplifier circuit is connected to the negative input end of secondary differential amplifier circuit; The differential signal negative output terminal of difference isolating amplifier circuit is connected to the positive input terminal of secondary differential amplifier circuit, and the output terminal of secondary differential amplifier circuit is the voltage detecting end.
2. a kind of alternating voltage according to claim 1 is isolated sample circuit, and it is characterized in that: said civil power load module is a single-phase alternating current.
3. a kind of alternating voltage according to claim 1 is isolated sample circuit, it is characterized in that: said full-wave rectifying circuit is made up of rectifier bridge parallel connection first resistance.
4. a kind of alternating voltage according to claim 1 is isolated sample circuit; It is characterized in that: said pressure filter circuit comprises second resistance, the 3rd resistance, the 4th resistance, first electric capacity, second electric capacity; The negative output terminal of full-wave rectifying circuit is connected to an end of second resistance; The other end of second resistance is connected to an end of the 3rd resistance, the negative pole of first electric capacity respectively; The other end of the 3rd resistance is connected to an end of the 4th resistance, the negative pole of second electric capacity, the differential signal positive input terminal of difference isolating amplifier circuit respectively, and the positive output end of full-wave rectifying circuit is connected to the positive pole of first electric capacity, the other end of the 4th resistance, the positive pole of second electric capacity, the differential signal negative input end of difference isolating amplifier circuit respectively.
5. a kind of alternating voltage according to claim 1 is isolated sample circuit; It is characterized in that: said secondary differential amplifier circuit comprises the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, adjustable resistance, diode, operational amplifier; One end of the 5th resistance is the negative input end of secondary differential amplifier circuit; The other end of the 5th resistance is connected to the negative input end of operational amplifier, an end of the 6th resistance respectively; The other end of the 6th resistance is connected to the output terminal of operational amplifier, an end of adjustable resistance, the adjustable end of adjustable resistance respectively, and an end of the 7th resistance is the positive input terminal of secondary differential amplifier circuit, and the other end of the 7th resistance is connected to the positive input terminal of operational amplifier, an end of the 8th resistance respectively; The other end ground connection of the 8th resistance; The other end of adjustable resistance is as the output terminal of secondary differential amplifier circuit and be connected to the positive pole of diode, an end of the 9th resistance respectively, and the negative pole of diode connects+the 5V direct supply, the other end ground connection of the 9th resistance.
6. a kind of alternating voltage according to claim 5 is isolated sample circuit; It is characterized in that: said secondary differential amplifier circuit also comprises the 3rd electric capacity, the 4th electric capacity; Said the 3rd electric capacity is connected in parallel on the two ends of the 6th resistance, and said the 4th electric capacity is connected in parallel on the two ends of the 8th resistance.
7. a kind of alternating voltage according to claim 1 is isolated sample circuit, and it is characterized in that: the differential signal input end of said difference isolating amplifier circuit also is parallel with a two-way transient voltage restraining diode.
8. isolate sample circuit according to the described a kind of alternating voltage of arbitrary claim in the claim 1 to 7, it is characterized in that: said difference isolating amplifier circuit is chip AMC1200.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220156435 CN202583298U (en) | 2012-04-14 | 2012-04-14 | Alternating current voltage isolated sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220156435 CN202583298U (en) | 2012-04-14 | 2012-04-14 | Alternating current voltage isolated sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202583298U true CN202583298U (en) | 2012-12-05 |
Family
ID=47252699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220156435 Expired - Lifetime CN202583298U (en) | 2012-04-14 | 2012-04-14 | Alternating current voltage isolated sampling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202583298U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472277A (en) * | 2013-09-12 | 2013-12-25 | 昆山新金福精密电子有限公司 | Voltmeter circuit |
| CN104459266A (en) * | 2014-12-12 | 2015-03-25 | 重庆和平自动化工程股份有限公司 | Electric quantity isolation module circuit |
| CN111106808A (en) * | 2019-12-31 | 2020-05-05 | 湖南晟和电源科技有限公司 | Isolated sampling circuit |
| CN111141949A (en) * | 2020-02-12 | 2020-05-12 | 东南大学 | Alternating voltage sampling circuit for output power control and design method thereof |
| CN114184993A (en) * | 2021-11-09 | 2022-03-15 | 东风电驱动系统有限公司 | Data acquisition method with synchronous self-calibration |
| CN117554687A (en) * | 2024-01-10 | 2024-02-13 | 常州通宝光电股份有限公司 | Alternating current mains voltage sampling circuit |
-
2012
- 2012-04-14 CN CN 201220156435 patent/CN202583298U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472277A (en) * | 2013-09-12 | 2013-12-25 | 昆山新金福精密电子有限公司 | Voltmeter circuit |
| CN104459266A (en) * | 2014-12-12 | 2015-03-25 | 重庆和平自动化工程股份有限公司 | Electric quantity isolation module circuit |
| CN111106808A (en) * | 2019-12-31 | 2020-05-05 | 湖南晟和电源科技有限公司 | Isolated sampling circuit |
| CN111106808B (en) * | 2019-12-31 | 2024-03-19 | 湖南晟和电源科技有限公司 | Isolation sampling circuit |
| CN111141949A (en) * | 2020-02-12 | 2020-05-12 | 东南大学 | Alternating voltage sampling circuit for output power control and design method thereof |
| CN111141949B (en) * | 2020-02-12 | 2022-02-11 | 东南大学 | Alternating voltage sampling circuit for output power control and design method thereof |
| CN114184993A (en) * | 2021-11-09 | 2022-03-15 | 东风电驱动系统有限公司 | Data acquisition method with synchronous self-calibration |
| CN117554687A (en) * | 2024-01-10 | 2024-02-13 | 常州通宝光电股份有限公司 | Alternating current mains voltage sampling circuit |
| CN117554687B (en) * | 2024-01-10 | 2024-03-22 | 常州通宝光电股份有限公司 | Alternating current mains voltage sampling circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202583298U (en) | Alternating current voltage isolated sampling circuit | |
| CN203849325U (en) | Alternating-current and direct-current voltage isolation differential sampling circuit | |
| CN102611091A (en) | Lightning stroke prevention surge test protection circuit for electronic equipment | |
| CN109946506B (en) | Zero crossing detection system | |
| CN103743940A (en) | Precise zero cross detection circuit for resonance current of high-frequency dedusting power supply | |
| CN203800802U (en) | Large current detection circuit and power source circuit | |
| CN104184111A (en) | Overvoltage protection circuit for high-voltage transmission line ground wire power getting | |
| CN203759105U (en) | Precise zero cross detection circuit for resonance current of high-frequency dedusting power supply | |
| CN201717794U (en) | Capacitor voltage reducing circuit using impedance input filter | |
| CN203933382U (en) | A kind of APFC of tape jam measuring ability | |
| CN107979066A (en) | Type B leakage circuit breakers and its detection method | |
| CN103997199A (en) | Active power factor correction circuit with fault detection function | |
| CN204068191U (en) | AFDD fault electric arc protector | |
| CN202748160U (en) | Anti-interference temperature sampling circuit | |
| CN105067931A (en) | Series fault arc detection circuit | |
| CN205015411U (en) | Series fault arc detection circuit | |
| CN204741603U (en) | Drive power supply's constant current steady voltage snubber circuit | |
| TW201345105A (en) | Current detecting device and power quality compensation system using same | |
| CN203261231U (en) | Direct-current filter used for photovoltaic inverter | |
| CN209961836U (en) | Zero-crossing detection system | |
| CN102856063B (en) | For the transformer of isolated amplifier | |
| CN208043901U (en) | A kind of novel ac high-voltage busbar detection circuit | |
| CN201918776U (en) | Simple CC charger | |
| CN204989283U (en) | Inductive current sampling and dc component detection circuitry among SVG | |
| CN203278208U (en) | Electronic overload relay capable of improving phase loss protection reliability |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121205 |
|
| CX01 | Expiry of patent term |