CN202471808U - Electrically-isolated voltage sampling module circuit - Google Patents
Electrically-isolated voltage sampling module circuit Download PDFInfo
- Publication number
- CN202471808U CN202471808U CN2012200649174U CN201220064917U CN202471808U CN 202471808 U CN202471808 U CN 202471808U CN 2012200649174 U CN2012200649174 U CN 2012200649174U CN 201220064917 U CN201220064917 U CN 201220064917U CN 202471808 U CN202471808 U CN 202471808U
- Authority
- CN
- China
- Prior art keywords
- voltage
- circuit
- voltage sampling
- electrically
- sampling module
- 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
Abstract
The utility model relates to the technical field of voltage sampling, in particular to an electrically-isolated voltage sampling module circuit. Compared with the prior art, the electrically-isolated voltage sampling module circuit is characterized in that 12V direct current is input and passes through a direct current / direct current (DC/DC) self-oscillating conversion circuit, a transformer and a rectification circuit, and two groups of isolated power are output and supplied to an operational amplifier of an electrically-isolated voltage sampling module; voltage passes through an attenuation circuit and the operational amplifier and is connected to an input end of a linear optical coupler; the output voltage and input voltage of the linear optical coupler are in linear relationship; the electrically-isolated voltage sampling module circuit is high in linearity and sensitivity and can accurately transmit a voltage signal; more than one order of magnitude of power loss ratio during measurement of high voltage and high current is reduced by using a Hall sensor; the heat loss and temperature rise of the whole system are reduced; a measured signal and a measurement system are not commonly grounded; and the stability of the measurement system and the stability of a control system are improved. The electrically-isolated voltage sampling module circuit has the advantages of small size, long service life, high anti-interference, high isolation voltage, high speed, compatibility with transistor-transistor logic (TTL) level, and the like.
Description
Technical field
The present invention relates to the voltage sampling technical field, particularly a kind of voltage sampling modular circuit of electrical isolation formula.
Background technology
Voltage sampling comprises the sampling of DC voltage sample circuit alternating voltage; The linearity of sampling can exchange generations such as the output voltage precision characteristic influence greatly of the supply unit of output to inverter, UPS, frequency converter etc.; Voltage isolation sampling of the prior art has following several kinds of DeviceModes: AC voltage transformer, Hall element, electric resistance partial pressure etc.; But these voltage isolation sampling equipments of the prior art all exist a lot of weak points; As: the voltage transformer (VT) volume is bigger, can only be used to the alternating voltage of taking a sample, and the restriction owing to volume in midget plant is also improper.The Hall element expensive, and when temperature variation, export and drift about easily; When the sampling high-voltage direct-current, have very big power attenuation simultaneously, isolate the sampling prime and need many group accessory power supplys, strengthened circuitry consumes, and can influence the measuring accuracy of sensor with the back level.Common electric resistance partial pressure is simple in structure; With resistor network high pressure is carried out dividing potential drop; Obtain scaled low-voltage, but not charged air bound leaves, the interference that measuring system and measured signal " altogether " are introduced can cause the instability of measuring system; Thereby influence the operate as normal of microsystem, can cause " deadlock " phenomenon to occur when serious.
Summary of the invention
For solving existing defective of voltage sampling and problem in the prior art, a kind of voltage sampling modular circuit of electrical isolation formula is provided.
The technical scheme that the present invention is adopted for its technical matters of solution is: the voltage sampling modular circuit of electrical isolation formula of the present invention at input 12V direct current after two groups of power supplys of isolating of output behind the DC/DC self-sustained oscillation change-over circuit, transformer, rectification circuit; For the amplifier of the voltage sampling module of back electrical isolation provides power supply; Voltage is connected to the input end of linear light lotus root after attenuator circuit, amplifier, linear light lotus root output voltage and input voltage are linear.
Electrical isolation adopts the high precision photoelectric coupling mechanism to isolate, and photoelectrical coupler comprises a high performance LED and two photodiode PD1 and photodiode PD2 that same process is processed.
The invention has the beneficial effects as follows: compared with prior art, the voltage sampling modular circuit of electrical isolation formula of the present invention has adopted modular design, simple appearance; Cost is lower, uses self-sustained oscillation convenient, integrated to recommend power supply; Only need the direct supply of external one group of 12V to get final product during use, have the very high linearity and sensitivity simultaneously, can accurately transmit voltage signal; Can the measuring voltage height to 2000 volt dc signals, usable range is wider; Power attenuation when measuring high-voltage direct-current reduces more than the one magnitude than with Hall element, has reduced the thermal losses and the temperature rise of total system, has improved the efficient of system; Also have measured signal and measuring system not altogether, can the electromagnetic interference (EMI) of forceful electric power side be coupled in the control system, reduced the interference of measured signal, improved the stability of measuring system and control system measuring system; Have that volume is little, life-span length, strong interference immunity, isolation voltage are high, high-speed, with advantage such as Transistor-Transistor Logic level compatibility.
Description of drawings
Be described further below in conjunction with accompanying drawing and embodiment voltage sampling modular circuit electrical isolation formula of the present invention.
Fig. 1 is the self-sustained oscillation change-over circuit figure of the voltage sampling modular circuit of electrical isolation formula of the present invention;
Fig. 2 is the isolation sampling switching circuit figure of the voltage sampling modular circuit of electrical isolation formula of the present invention;
Fig. 3 is the high precision photoelectric coupler circuit figure of the voltage sampling modular circuit of electrical isolation formula of the present invention;
Fig. 4 is the reference voltage generating circuit figure of the voltage sampling modular circuit of electrical isolation formula of the present invention.
Embodiment
Extremely shown in Figure 4 like Fig. 1; The voltage sampling modular circuit of electrical isolation formula of the present invention at input 12V direct current after two groups of power supplys of isolating of output behind the DC/DC self-sustained oscillation change-over circuit, transformer, rectification circuit; For the amplifier of the voltage sampling module of back electrical isolation provides power supply; Voltage is connected to the input end of linear light lotus root after attenuator circuit, amplifier, linear light lotus root output voltage and input voltage are linear.Adopt the voltage sample circuit of handing over straight one, after amplifier is amplified, the working power of amplifier is that generation ± 12V power supply is recommended in self-excitation to sampling voltage (exchanging or direct current) through resistance decrement.Amplifier is passed through in voltage and reference voltage addition after amplifier is amplified again, after receive the input end of linear light lotus root.In this way; The voltage that need not consider prime input in the use is direct current or interchange, and circuit can operate as normal, avoid because of exchange, DC voltage needs more additional device because of the difference of polarity; Thereby make circuit more succinct, use convenient.Produce with the required reference voltage of eliminate bias for biasing is set, adopt the voltage reference chip, such voltage tool that produces is accurate, and circuit is simple again, because front and back voltage is not altogether, therefore needs two groups of such voltages.
As shown in Figure 1; The self-sustained oscillation change-over circuit is that sampling module provides needed accessory power supply, adopts the self-excitation push-pull mode, and the 12V power supply is input to the transformation of transformer; Get back to the negative terminal of 12V power supply then through triode; Produce the needed driving of triode through RC self-sustained oscillation simultaneously, level produces the voltage of two groups+12V and the voltage of two groups-12V behind the transformer behind rectification circuit, for sampling module provides power supply.The center tap of transformer is taken out the input of 12V; Q1, Q2 are the identical triodes of model; Be stored in the circuit with push pull mode, each waveform of being responsible for positive and negative week amplifies task, during circuit working; The power switch pipe of two symmetries has only a conducting, so the little efficient of switch transformer magnetic core utilization factor height conduction loss is high.Through the RC self-oscillation, for Q1, Q2 provide driving circuit, Secondary winding of transformer produces needed power supply after rectification, filtering, voltage stabilizing, wherein every group+12V and the-shared winding of 12V; And altogether, whole sample circuit may be plotted on the very little printed circuit board (PCB), is easily installed in the place that needs sampled signal; Measure high voltage direct current, adopt the self-excitation push-pull mode, make circuit structure more succinct; Needed former device is few, and cost is lower, and the volume of module is also littler.
As shown in Figures 2 and 3; Electrical isolation adopts the high precision photoelectric coupling mechanism to isolate; Photoelectrical coupler comprises a high performance LED and two photodiode PD1 and photodiode PD2 that strict proportionate relationship was processed and had to same process; Be the cut-away view of linear light lotus root, LED is the luminous component of light lotus root, and photodiode PD1 and photodiode PD2 are the parts that the light lotus root receives light; The light that LED sends is received by both; Voltage after the amplifier receives LED and photodiode PD1 forms the input road portion that isolates change-over circuit and forms negative feedback, and photodiode PD2 constitutes the output of isolating change-over circuit, because the entire circuit importation constitutes negative feedback loop; Thereby as long as the LED of negative feedback channel and photodiode PD1 relation confirm that it is just stable to isolate the conversion importation.Because photodiode PD2 and photodiode PD1 strictness are proportional, so just can make the output signal become stable proportionate relationship with input signal again through suitable circuit.Photodiode PD2 output is subtracted each other with reference voltage after amplifier; After passing through amplifier again; Be exactly the output of integral module, so just the direct current biasing of prime benchmark is eliminated, make whole module output be entered as linear relationship; And polarity is consistent, avoids the internal-external circuit because of the different errors of being brought of earth point; Protect internal circuit to avoid the influence of external circuit fault simultaneously.
In sum, compared with prior art, the voltage sampling modular circuit of electrical isolation formula of the present invention has adopted modular design; Simple appearance, cost is lower, uses convenient; Power supply is recommended in integrated self-sustained oscillation, only needs the direct supply of external one group of 12V to get final product during use, has the very high linearity and sensitivity simultaneously; Can accurately transmit voltage signal, can the measuring voltage height to 2000 volt dc signals, usable range is wider; Power attenuation when measuring high-voltage direct-current reduces more than the one magnitude than with Hall element, has reduced the thermal losses and the temperature rise of total system, has improved the efficient of system; Also have measured signal and measuring system not altogether, can the electromagnetic interference (EMI) of forceful electric power side be coupled in the control system, reduced the interference of measured signal, improved the stability of measuring system and control system measuring system; Have that volume is little, life-span length, strong interference immunity, isolation voltage are high, high-speed, with advantage such as Transistor-Transistor Logic level compatibility.
According to embodiments of the invention describing the present invention property and nonrestrictive description, but should be understood that and do not breaking away under the situation of the relevant protection domain that limits claim that those skilled in the art can make change and/or revise.
Claims (2)
1. the voltage sampling modular circuit of an electrical isolation formula; It is characterized in that; Described voltage sampling modular circuit at input 12V direct current after two groups of power supplys of isolating of output behind the DC/DC self-sustained oscillation change-over circuit, transformer, rectification circuit; For the amplifier of the voltage sampling module of back electrical isolation provides power supply, voltage is connected to the input end of linear light lotus root after attenuator circuit, amplifier, and described linear light lotus root output voltage and input voltage are linear.
2. the voltage sampling modular circuit of electrical isolation formula according to claim 1; It is characterized in that; Described electrical isolation adopts the high precision photoelectric coupling mechanism to isolate, and described photoelectrical coupler comprises a high performance LED and two photodiode PD1 and photodiode PD2 that same process is processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200649174U CN202471808U (en) | 2012-02-26 | 2012-02-26 | Electrically-isolated voltage sampling module circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200649174U CN202471808U (en) | 2012-02-26 | 2012-02-26 | Electrically-isolated voltage sampling module circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202471808U true CN202471808U (en) | 2012-10-03 |
Family
ID=46919960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200649174U Expired - Lifetime CN202471808U (en) | 2012-02-26 | 2012-02-26 | Electrically-isolated voltage sampling module circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202471808U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023340A (en) * | 2012-11-27 | 2013-04-03 | 中环天仪股份有限公司 | Power circuit and method for increasing load capacity of two-wire system instrument |
| CN104749409A (en) * | 2015-04-13 | 2015-07-01 | 四川拓普测控科技有限公司 | High-speed optical isolation voltage sensor suitable for lightning overvoltage environment |
| CN108288870A (en) * | 2018-02-24 | 2018-07-17 | 数源科技股份有限公司 | A kind of linear electrical isolation circuit system |
| CN110672917A (en) * | 2019-11-19 | 2020-01-10 | 宁波中车时代传感技术有限公司 | Small-size voltage sensor circuit |
| CN112986645A (en) * | 2021-01-27 | 2021-06-18 | 力高(山东)新能源技术有限公司 | Method for eliminating current error caused by Hall power supply voltage |
-
2012
- 2012-02-26 CN CN2012200649174U patent/CN202471808U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023340A (en) * | 2012-11-27 | 2013-04-03 | 中环天仪股份有限公司 | Power circuit and method for increasing load capacity of two-wire system instrument |
| CN104749409A (en) * | 2015-04-13 | 2015-07-01 | 四川拓普测控科技有限公司 | High-speed optical isolation voltage sensor suitable for lightning overvoltage environment |
| CN108288870A (en) * | 2018-02-24 | 2018-07-17 | 数源科技股份有限公司 | A kind of linear electrical isolation circuit system |
| CN110672917A (en) * | 2019-11-19 | 2020-01-10 | 宁波中车时代传感技术有限公司 | Small-size voltage sensor circuit |
| CN112986645A (en) * | 2021-01-27 | 2021-06-18 | 力高(山东)新能源技术有限公司 | Method for eliminating current error caused by Hall power supply voltage |
| CN112986645B (en) * | 2021-01-27 | 2023-04-07 | 力高(山东)新能源技术股份有限公司 | Method for eliminating current error caused by Hall power supply voltage |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202471808U (en) | Electrically-isolated voltage sampling module circuit | |
| CN103698579B (en) | Low voltage frequency converter DC voltage sampling apparatus | |
| CN202794334U (en) | Wide-range direct current standard electric energy meter | |
| CN101923111A (en) | Isolation detection circuit of DC bus voltage | |
| CN102290994A (en) | Isolating transmission method of switch power supply and circuit thereof | |
| CN204945357U (en) | A kind of electronic mutual inductor steady state error measuring means | |
| CN102435810A (en) | Method and device for detecting direct-current component in alternating current | |
| CN103698571B (en) | There is current transformer arrangement and the bus current detection method of self energizing low-power consumption | |
| CN104655908A (en) | Signal transmission device and method for current transformer | |
| CN210469231U (en) | Weak signal amplifier | |
| CN203133243U (en) | Floating-ground test system | |
| CN103229404A (en) | Voltage sensing arrangement for a flyback converter | |
| CN103869144B (en) | Isolation voltage sampling circuit | |
| CN103647447B (en) | The supply unit of a kind of electric energy table communication module | |
| CN203643494U (en) | Isolated current detection circuit | |
| CN102346216A (en) | Circuit capable of realizing accurate measurement of alternating current zero-crossing signal by using linear opticalcoupler | |
| CN202189087U (en) | Device for detecting direct current components in alternating current | |
| CN207249098U (en) | Intelligent electric meter low cost high power measuring system | |
| CN204669230U (en) | Isolation type switch power | |
| CN204131397U (en) | A kind of input voltage detection circuit of isolating inverse-excitation type high frequency switch power | |
| CN208969157U (en) | A kind of DC voltage measuring device | |
| CN115993481A (en) | DC metering voltage sampling device of electric energy meter | |
| CN208092206U (en) | Circuit-breaker status detection device and breaker | |
| CN101173966A (en) | Zero voltage drop digital optoelectronic metering installation | |
| CN201886055U (en) | Full-range high-linearity analog signal buffer circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121003 |