CN204347110U - A kind of alternating current sample circuit - Google Patents
A kind of alternating current sample circuit Download PDFInfo
- Publication number
- CN204347110U CN204347110U CN201420864039.3U CN201420864039U CN204347110U CN 204347110 U CN204347110 U CN 204347110U CN 201420864039 U CN201420864039 U CN 201420864039U CN 204347110 U CN204347110 U CN 204347110U
- Authority
- CN
- China
- Prior art keywords
- resistance
- output terminal
- alternating current
- amplifier
- wave detecting
- 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.)
- Active
Links
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
A kind of alternating current sample circuit, amplifier U1A inverting input connects the zero line AC-N of the alternating current be sampled via resistance R1, normal phase input end one tunnel connects the live wire AC-L of the alternating current be sampled via resistance R2, another road is via resistance R3 ground connection, resistance R4 is connected across between the inverting input of amplifier U1A and output terminal, form positive half-wave detecting circuit, the output terminal of amplifier U1A is as the output terminal of positive half-wave detecting circuit; Amplifier U1B inverting input connects live wire AC-L via resistance R8, normal phase input end one tunnel connects zero line AC-N via resistance R9, another road is via resistance R11 ground connection, resistance R10 is connected across between the inverting input of amplifier U1B and output terminal, form negative half-wave detecting circuit, the output terminal of amplifier U1B is as the output terminal of negative half-wave detecting circuit; The output terminal of positive half-wave detecting circuit and the output terminal of negative half-wave detecting circuit connect, and their contact is as the output terminal of this alternating current sample circuit.
Description
Technical field
The invention relates to a kind of alternating current sample circuit.
Background technology
The application of alternating current is widely, extremely important to AC electric equipment for the accuracy of the sampling of alternating current.
The sample mode of common alternating current is, utilizes diode pair alternating current to carry out rectification, then via capacitor filtering, thus AC process is become direct current, detect the situation that this galvanic situation can know alternating current.Existing this alternating current sample circuit exists following not enough:
1, there is threshold voltage in diode, and when the alternating current voltage of sampling is less than threshold voltage, diode rectifier circuit cisco unity malfunction, also just cannot sample to alternating current;
2, there is nonlinearity erron in diode, and sampling can be caused inaccurate;
3, the temperature characterisitic of diode is poor, easily influenced by ambient temperature, easily causes detection inaccurate.
Summary of the invention
For the above-mentioned technical matters that prior art exists, the invention provides a kind of alternating current sample circuit, and its sampling accurately, and does not exist threshold voltage, can sample to the alternating current of small voltage.
For achieving the above object, the invention provides following technical scheme.
A kind of alternating current sample circuit, comprise amplifier U1A, amplifier U1B, resistance R1, R2, R3, R4, R8, R9, R10 and R11, amplifier U1A inverting input connects the zero line AC-N of the alternating current be sampled via resistance R1, normal phase input end one tunnel connects the live wire AC-L of the alternating current be sampled via resistance R2, another road is via resistance R3 ground connection, resistance R4 is connected across between the inverting input of amplifier U1A and output terminal, form positive half-wave detecting circuit, the output terminal of amplifier U1A is as the output terminal of positive half-wave detecting circuit; Amplifier U1B inverting input connects the live wire AC-L of the alternating current be sampled via resistance R8, normal phase input end one tunnel connects the zero line AC-N of the alternating current be sampled via resistance R9, another road is via resistance R11 ground connection, resistance R10 is connected across between the inverting input of amplifier U1B and output terminal, form negative half-wave detecting circuit, the output terminal of amplifier U1B is as the output terminal of negative half-wave detecting circuit; The output terminal of positive half-wave detecting circuit and the output terminal of negative half-wave detecting circuit connect, and their contact is as the output terminal of this alternating current sample circuit.
Wherein, also comprise resistance R6 and R7, resistance R6 one end connects positive bias power supply+Vref, and the other end connects live wire AC-L, and resistance R7 one end connects positive bias power supply+Vref, and the other end connects zero line AC-N, forms DC bias circuit.
Wherein, also comprise resistance R5 and R12, resistance R5 and R12 is connected between the output terminal of positive half-wave detecting circuit and the output terminal of negative half-wave detecting circuit after connecting, and the contact of resistance R5 and R12 is as the output terminal of this alternating current sample circuit.
Wherein, also comprise filter capacitor C2, its one end connects the output terminal of this alternating current sample circuit, other end ground connection.
Wherein, the resistance of resistance R1 and R2 is equal, and the resistance of resistance R3 and R4 is equal, and the resistance of resistance R8 and R9 is equal, and the resistance of resistance R10 and R11 is equal.
The beneficial effect of the invention is: use and substitute diode based on the positive half-wave detecting circuit formed primarily of amplifier and negative half-wave detecting circuit and carry out rectification to the positive half-wave of alternating current and negative half-wave respectively, the linear characteristic of amplifier and temperature characterisitic are all relatively good, be not easy influenced by ambient temperature, also there is not nonlinearity erron, therefore the alternating current sampling circuit samples of the invention is accurate, and there is not threshold voltage due to amplifier, even the alternating current of small voltage, also can sample.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the alternating current sample circuit of the invention.
Fig. 2 is the oscillogram of the one-period of the alternating current be sampled.
Fig. 3 is the oscillogram of the one-period of the output of positive half-wave detecting circuit.
Fig. 4 is the oscillogram of the one-period of the output of negative half-wave detecting circuit.
Fig. 5 is the oscillogram of the one-period of the output of the alternating current sample circuit of the invention.
Embodiment
Below in conjunction with specific embodiment, the invention is elaborated.
As shown in Figure 1, the alternating current sample circuit of the present embodiment comprises amplifier U1A, amplifier U1B, resistance R1 ~ R12, electric capacity C1 and C2, amplifier U1A inverting input connects the zero line AC-N of the alternating current be sampled via resistance R1, normal phase input end one tunnel connects the live wire AC-L of the alternating current be sampled via resistance R2, another road is via resistance R3 ground connection, resistance R4 is connected across between the inverting input of amplifier U1A and output terminal, form positive half-wave detecting circuit, the output terminal of amplifier U1A is as the output terminal of positive half-wave detecting circuit; Amplifier U1B inverting input connects the live wire AC-L of the alternating current be sampled via resistance R8, normal phase input end one tunnel connects the zero line AC-N of the alternating current be sampled via resistance R9, another road is via resistance R11 ground connection, resistance R10 is connected across between the inverting input of amplifier U1B and output terminal, form negative half-wave detecting circuit, the output terminal of amplifier U1B is as the output terminal of negative half-wave detecting circuit; Resistance R5 and R12 is connected between the output terminal of positive half-wave detecting circuit and the output terminal of negative half-wave detecting circuit after connecting, and the contact of resistance R5 and R12 is as the output terminal of this alternating current sample circuit.Electric capacity C2 one end connects the output terminal of this alternating current sample circuit, other end ground connection, plays the effect of the output filtering of the alternating current sample circuit to the present embodiment.In the present embodiment, the resistance of resistance R1 and R2 is equal, and the resistance of resistance R3 and R4 is equal, and the resistance of resistance R8 and R9 is equal, and the resistance of resistance R10 and R11 is equal.
Resistance R6 one end connects positive bias power supply+Vref, and the other end connects live wire AC-L, and resistance R7 one end connects positive bias power supply+Vref, and the other end connects zero line AC-N, and form DC bias circuit, in the present embodiment, positive bias power supply+Vref is+5V voltage source.The effect of DC bias circuit is the voltage that integral raising is input to the alternating current of the alternating current sample circuit of the present embodiment, prevents current waveform in full-wave rectifier generation intermodulation distortion phenomenon.
The waveform of the one-period of the alternating current be sampled as shown in Figure 2, composition graphs 1, wherein U1 is the level of zero line AC-N, U2 is the level of live wire AC-L, when the alternating current be sampled is positive half-wave, first some pressure drops can be produced with positive bias power supply+Vref(resistance R6 and R7) superpose, then two-way is divided to send, positive half-wave detecting circuit is sent on one tunnel, by positive half-wave detecting circuit scale amplifying, the output terminal output voltage Uo1 of amplifier U1A, Uo1=R1/R4 (U2-U1) is known by computing formula, due to now U2-U1 > 0, Uo1 is just, the positive half-wave of the alternating current be that is sampled is exported according to after certain scale amplifying by positive half-wave detecting circuit.Negative half-wave detecting circuit is sent on another road, scale amplifying is carried out by negative half-wave detecting circuit, the output terminal output voltage Uo2 of amplifier U1B, Uo2=R8/R10 (U1-U2) is known by computing formula, due to now U2-U1 > 0, and the working power of amplifier is single supply, therefore Uo2=0.
When the alternating current be sampled is for negative half-wave, first some pressure drops can be produced with positive bias power supply+Vref(resistance R6 and R7) superpose, then two-way is divided to send, positive half-wave detecting circuit is sent on one tunnel, by positive half-wave detecting circuit scale amplifying, and the output terminal output voltage Uo1 of amplifier U1A, Uo1=R1/R4 (U2-U1) is known by computing formula, due to now U2-U1 < 0, and the working power of amplifier is single supply, therefore Uo1=0.Negative half-wave detecting circuit is sent on another road, scale amplifying is carried out by negative half-wave detecting circuit, the output terminal output voltage Uo2 of amplifier U1B, Uo2=R8/R10 (U1-U2) is known by computing formula, due to now U2-U1 < 0, Uo2 is just, the negative half-wave of the alternating current be that is sampled is born half-wave detecting circuit and exported according to after certain scale amplifying.
The output waveform of the one-period of positive half-wave detecting circuit and negative half-wave detecting circuit respectively as shown in Figure 3 and Figure 4, Uo1 and Uo2 superposes at the output terminal of the alternating current sample circuit of the present embodiment, the waveform Uo of a final formation full-wave rectification, the waveform of the one-period of Uo as shown in Figure 5.Just the situation of the alternating current be sampled can be known by Uo.
Finally should be noted that; above embodiment is only in order to illustrate the technical scheme of the invention; but not the restriction to the invention protection domain; although done to explain to the invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to the technical scheme of the invention or equivalent replacement, and not depart from essence and the scope of the invention technical scheme.
Claims (5)
1. an alternating current sample circuit, it is characterized in that, comprise amplifier U1A, amplifier U1B, resistance R1, R2, R3, R4, R8, R9, R10 and R11, amplifier U1A inverting input connects the zero line AC-N of the alternating current be sampled via resistance R1, normal phase input end one tunnel connects the live wire AC-L of the alternating current be sampled via resistance R2, another road is via resistance R3 ground connection, resistance R4 is connected across between the inverting input of amplifier U1A and output terminal, form positive half-wave detecting circuit, the output terminal of amplifier U1A is as the output terminal of positive half-wave detecting circuit; Amplifier U1B inverting input connects the live wire AC-L of the alternating current be sampled via resistance R8, normal phase input end one tunnel connects the zero line AC-N of the alternating current be sampled via resistance R9, another road is via resistance R11 ground connection, resistance R10 is connected across between the inverting input of amplifier U1B and output terminal, form negative half-wave detecting circuit, the output terminal of amplifier U1B is as the output terminal of negative half-wave detecting circuit; The output terminal of positive half-wave detecting circuit and the output terminal of negative half-wave detecting circuit connect, and their contact is as the output terminal of this alternating current sample circuit.
2. alternating current sample circuit according to claim 1, is characterized in that, also comprises resistance R6 and R7, resistance R6 one end connects positive bias power supply+Vref, and the other end connects live wire AC-L, and resistance R7 one end connects positive bias power supply+Vref, the other end connects zero line AC-N, forms DC bias circuit.
3. alternating current sample circuit according to claim 1, it is characterized in that, also comprise resistance R5 and R12, resistance R5 and R12 is connected between the output terminal of positive half-wave detecting circuit and the output terminal of negative half-wave detecting circuit after connecting, and the contact of resistance R5 and R12 is as the output terminal of this alternating current sample circuit.
4. alternating current sample circuit according to claim 1, is characterized in that, also comprises filter capacitor C2, and its one end connects the output terminal of this alternating current sample circuit, other end ground connection.
5. alternating current sample circuit according to claim 1, is characterized in that, the resistance of resistance R1 and R2 is equal, and the resistance of resistance R3 and R4 is equal, and the resistance of resistance R8 and R9 is equal, and the resistance of resistance R10 and R11 is equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420864039.3U CN204347110U (en) | 2014-12-31 | 2014-12-31 | A kind of alternating current sample circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420864039.3U CN204347110U (en) | 2014-12-31 | 2014-12-31 | A kind of alternating current sample circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204347110U true CN204347110U (en) | 2015-05-20 |
Family
ID=53230371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420864039.3U Active CN204347110U (en) | 2014-12-31 | 2014-12-31 | A kind of alternating current sample circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204347110U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233683A (en) * | 2018-01-11 | 2018-06-29 | 长沙广义变流技术有限公司 | A kind of single phase ac signal power amplification control system |
| CN108982957A (en) * | 2017-06-01 | 2018-12-11 | 现代自动车株式会社 | For improving the sensing system and method for the control of sensor detected value |
| CN112305299A (en) * | 2020-10-19 | 2021-02-02 | 珠海格力电器股份有限公司 | Alternating current sampling device |
-
2014
- 2014-12-31 CN CN201420864039.3U patent/CN204347110U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108982957A (en) * | 2017-06-01 | 2018-12-11 | 现代自动车株式会社 | For improving the sensing system and method for the control of sensor detected value |
| CN108982957B (en) * | 2017-06-01 | 2022-02-11 | 现代自动车株式会社 | Sensing system and method for improving control of sensor detection values |
| CN108233683A (en) * | 2018-01-11 | 2018-06-29 | 长沙广义变流技术有限公司 | A kind of single phase ac signal power amplification control system |
| CN108233683B (en) * | 2018-01-11 | 2020-12-08 | 长沙广义变流技术有限公司 | Single-phase alternating current signal power amplification control system |
| CN112305299A (en) * | 2020-10-19 | 2021-02-02 | 珠海格力电器股份有限公司 | Alternating current sampling device |
| CN112305299B (en) * | 2020-10-19 | 2021-11-12 | 珠海格力电器股份有限公司 | Alternating current sampling device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204347110U (en) | A kind of alternating current sample circuit | |
| CN106526399B (en) | New energy automobile charging box's ground connection and wrong looks detection circuitry | |
| CN102830334B (en) | Novel photovoltaic grid-connected inverter insulation detection circuit and detection method thereof | |
| CN203688646U (en) | Zero crossing detection circuit | |
| CN204347111U (en) | Alternating current sample circuit | |
| CN107765084B (en) | Universal voltage input power frequency signal frequency measurement system | |
| CN106526295B (en) | Self calibration current comparison circuit | |
| CN111077356B (en) | Current detection circuit, method, apparatus and storage medium | |
| CN205049548U (en) | Gas sensor's temperature compensated equipment | |
| CN103722276A (en) | Peak current feedback circuit used for inverter welding machine | |
| CN204514996U (en) | Alternating current testing circuit | |
| CN103913628B (en) | The method and apparatus for measuring ac voltage signal under light load conditions | |
| CN204166058U (en) | A kind of city electro-mechanical wave quick detection circuit | |
| CN207516439U (en) | Alternating current acquisition module and detection device | |
| CN204439702U (en) | Inverter type welder current sampling circuit | |
| CN204202773U (en) | A kind of high-frequency and high-voltage power supply temperature sensing circuit | |
| CN103616548B (en) | A kind of output current of inverting welding machine testing circuit based on direct current signal and detection method | |
| CN104991111A (en) | Wide-range alternating current signal zero-cross detection method and device | |
| CN204462240U (en) | The ac power supply line state detection circuit of high sensitivity and high input impedance | |
| CN104457825A (en) | High-frequency conversion detection system with low heating value | |
| CN204575721U (en) | DC component detection circuit | |
| CN204789714U (en) | A current detection system for domestic intelligent power distribution system | |
| CN204131419U (en) | A kind of automatic bias power supply circuits for non-isolated electric energy measurement | |
| CN204027718U (en) | Generator amature winding temperature on-Line Monitor Device | |
| CN103472292A (en) | Electrical equipment load terminal voltage monitoring and collecting technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |