CN209471169U - A kind of DC voltage isolation Acquisition Circuit - Google Patents
A kind of DC voltage isolation Acquisition Circuit Download PDFInfo
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- CN209471169U CN209471169U CN201822275940.8U CN201822275940U CN209471169U CN 209471169 U CN209471169 U CN 209471169U CN 201822275940 U CN201822275940 U CN 201822275940U CN 209471169 U CN209471169 U CN 209471169U
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Abstract
Disclose a kind of DC voltage isolation Acquisition Circuit, including direct current signal input terminal, signal output end, isolation transfer circuit, current rectifying and wave filtering circuit, output signal feed circuit and drive control circuit, wherein isolation transfer circuit one end is connect with direct current signal input terminal, and the other end is connect with current rectifying and wave filtering circuit and output signal feed circuit respectively；Current rectifying and wave filtering circuit one end is connected with transfer circuit is isolated, and the other end is connect with signal output end, for restoring direct-flow input signal in proportion；The first end of output signal feed circuit is connect with transfer circuit connection, second end is isolated with drive control circuit, for generating feedback signal, output signal and direct-flow input signal is made to be kept fixed ratio.Above-mentioned DC voltage isolation Acquisition Circuit in the environment of high voltage, high interference, can complete the isolation acquisition of voltage signal and guarantee that acquisition precision is good.
Description
Technical field
The utility model relates to power electronics fields more particularly to a kind of DC voltage, and Acquisition Circuit is isolated.
Background technique
DC voltage isolation Acquisition Circuit mainly has following three kinds at present: (1) acquiring signal using isolation detection chip.This
Kind isolation detection chip needs individually power supply, and can not receive 5V or more voltage signal, therefore circuit is complicated, at high cost, can not
Adapt to high input voltage signal.(2) light-coupled isolation acquisition mode is used, linear optical coupling isolation, transmission of analogue signal are passed through.This side
Not only circuit is complicated for formula, and is limited in different temperatures by optocoupler transmission spy, it may occur that biggish temperature drift problem.(3) it adopts
Signal is detected with direct current Hall element.This mode volume is big, and cost is high, and it is also required to provide external power supply.
Utility model content
The utility model provides a kind of DC voltage isolation Acquisition Circuit, it is therefore intended that acquisition electricity is isolated by DC voltage
D. c. voltage signal is isolated by this circuit on road, is transmitted to signal acquisition terminal, and precision with higher.
The purpose of this utility model is achieved through the following technical solutions:
The utility model provides a kind of DC voltage isolation Acquisition Circuit, including direct current signal input terminal, signal output end,
It is characterized in that, DC voltage isolation Acquisition Circuit further includes that isolation transfer circuit, current rectifying and wave filtering circuit, output signal are anti-
Current feed circuit and drive control circuit,
Wherein, isolation transfer circuit one end connect with direct current signal input terminal, the other end respectively with current rectifying and wave filtering circuit and
The connection of output signal feed circuit；Current rectifying and wave filtering circuit one end connects with transfer circuit connection, the other end and signal output end is isolated
It connects, for restoring direct-flow input signal in proportion；The first end of output signal feed circuit is connected with transfer circuit is isolated, the
Two ends are connect with drive control circuit, for generating feedback signal, output signal and direct-flow input signal are made to be kept fixed ratio；
Drive control circuit one end is connect with transfer circuit connection, the other end is isolated with output signal feed circuit, for according to output
The state dynamic of signal feedback circuit adjusts, and makes to be kept fixed ratio between output signal and direct-flow input signal.
Wherein, the isolation transfer circuit includes the first winding of the same magnetic core of transformer coiling, the second winding and the
Three winding, wherein the first winding is for detecting direct-flow input signal, the second winding is used to form output signal, and the tertiary winding is used for
Form output signal feedback.
For example, the DC voltage isolation Acquisition Circuit further includes balancing circuitry, wherein balancing circuitry includes for exporting
The first of signal feedback circuit balances the load and balances the load for the second of output signal, and balancing circuitry is arranged to compensate for device
The deviation of part.
For example, DC voltage isolation Acquisition Circuit further includes auxiliary power supply circuit, auxiliary power supply circuit on one side and straight
Signal input part connection is flowed, the other end is connect with drive control circuit, for powering to drive control circuit.
The utility model has the following beneficial effects: 1) due to not no electrically straight of direct-flow input signal end and acquisition signal end
Connection is connect, the isolation pressure resistance of some strength can be born.2) in the environment of high voltage, high interference, voltage signal can be completed
Isolation acquisition, and guarantee that acquisition precision is good.3) additional power source is not needed, circuit is simple, can be according to external environment flexible setting
Transmission ratio.4) cost is relatively low, small in size.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the utility model embodiment, the attached drawing of embodiment will be made below simple
Ground introduction, it should be apparent that, the accompanying drawings in the following description merely relates to some embodiments of the utility model, rather than practical to this
Novel limitation.
Fig. 1 is the block diagram of the DC voltage isolation Acquisition Circuit of an embodiment of the present invention；
Fig. 2 is the circuit diagram of the DC voltage isolation Acquisition Circuit of an embodiment of the present invention；
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
The technical solution of the utility model embodiment is clearly and completely described in the attached drawing of type embodiment.Obviously, described
Embodiment is a part of the embodiment of the utility model, instead of all the embodiments.Based on described the utility model
Embodiment, those of ordinary skill in the art's every other embodiment obtained under the premise of being not necessarily to creative work, all belongs to
In the range of the utility model protection.
Fig. 1 is the block diagram of the DC voltage isolation Acquisition Circuit of an embodiment of the present invention.As shown in Figure 1, direct current
Voltage isolation picking circuit includes direct current signal input terminal 10, signal output end 80, further includes isolation transfer circuit 20, rectification filter
Wave circuit 30, output signal feed circuit 60 and drive control circuit 50.Wherein, direct current signal input terminal 10 respectively be isolated pass
It passs circuit 20 and auxiliary power supply circuit 40 connects, for believing to isolation transfer circuit 20 and 40 input direct-current of auxiliary power supply circuit
Number.Isolation 20 one end of transfer circuit is connect with direct current signal input terminal 10, comes from direct current for transmitting under conditions of Magnetic isolation
The direct-flow input signal of signal input part 10；The other end connects with current rectifying and wave filtering circuit 30 and output signal feed circuit 60 respectively
It connects, for transmitting the output signal from signal output end under conditions of Magnetic isolation.30 one end of current rectifying and wave filtering circuit be isolated
Transfer circuit 20 connects, and the other end is connect with signal output end 80, for realizing rectification, filter function, to realize in proportion also
Original goes out the function of direct-flow input signal.The first end of output signal feed circuit 60 is connected with transfer circuit 20 is isolated, second end
It is connect with drive control circuit 50, for generating deviation caused by feedback signal is changed with thermal compensation signal, makes output signal and straight
Stream input signal is kept fixed ratio.50 one end of drive control circuit is connected with transfer circuit 20 is isolated, and the other end and output are believed
Number feed circuit 60 connects, and for being adjusted according to the state dynamic of output signal feed circuit, inputs output signal and direct current
Signal is kept fixed ratio.Signal output end 80 exports the direct-flow output signal proportional to direct-flow input signal.
For example, the DC voltage isolation Acquisition Circuit further includes balancing circuitry 70.Balancing circuitry 70 includes for exporting
The first of signal feedback circuit 60 balances the load and balances the load for the second of signal output end 80, and balancing circuitry 70 is arranged
For the droop for compensating device.
For example, DC voltage isolation Acquisition Circuit further includes auxiliary power supply circuit 40, the one of auxiliary power supply circuit 40
End is connect with direct current signal input terminal 10, and the other end is connect with drive control circuit 50, for powering to drive control circuit 50.
For example, isolation transfer circuit 20 includes the first winding, the second winding and the third of the same magnetic core of transformer coiling
Winding, wherein the first winding is used to form output signal for detecting direct-flow input signal, the second winding, the tertiary winding is used for shape
It is fed back at output signal.It can also include the 4th winding that transfer circuit 20, which is isolated, and the 4th winding helps to improve auxiliary power supply 40
Power supply capacity.
Fig. 2 is the circuit diagram of the DC voltage isolation Acquisition Circuit of an embodiment of the present invention.As shown in Fig. 2, direct current
Signal input part 10 includes input terminal P1 and P2, and direct-flow input signal is the d. c. voltage signal being added between P1 and P2.Isolation
Transfer circuit 20 realized by transformer T1, and device with matching is transistor VM1, VD1 to VD4.Current rectifying and wave filtering circuit 30
Including transistor VD1, VD3, inductor L1 and capacitor C1, signal rectification, filter function are completed, jointly in order to restore in proportion
Direct-flow input signal out.Drive control circuit 50 is adjusted according to the state dynamic of output signal feed circuit, makes direct current input letter
Number and output signal keep proportionate relationship.Output signal feed circuit 60 include transistor VD2, VD4, inductor L2, capacitor C2,
C3, resistance R3, R4, R5 and operational amplifier N1A, for obtaining and the proportional direct current signal of direct-flow input signal, and should
Signal between signal and P3, P4 also proportional relationship.Output signal feed circuit 60 has identical with current rectifying and wave filtering circuit
Electronic device is to replicate similar signal output.For example, current rectifying and wave filtering circuit has transistor VD1, VD3, inductor L1, capacitor
C1, output signal feed circuit 60 have similar transistor VD2, VD4, inductor L2, capacitor C2.Balancing circuitry 70 includes electricity
R2 is hindered, R2 forms the balanced load of output signal, further includes the balanced load that output feedback signal is collectively formed in R4 and R3, passes through
Adjusting R2 can make output signal and feedback signal form stringent proportionate relationship.Signal output end 80 include P3 and P4, P3 and
Signal between P4 is to pass out after Acquisition Circuit processing is isolated in DC voltage, the direct current letter proportional to direct-flow input signal
Number.The direct current signal can be further processed by the circuits such as DC partial voltage or AD acquisition, since the partial circuit is not belonging to this reality
The content illustrated with novel emphasis, is not shown in the figure.
The working principle of the DC voltage isolation Acquisition Circuit of the utility model is described by taking Fig. 2 as an example below.Direct current input
After signal is inputted by the end P1 and P2, into isolation transfer circuit, at the same time, it can be handled by auxiliary power supply, to each
Control circuit power supply.After direct-flow input signal enters isolation transfer circuit, the winding between transformer 1,2 is for detecting direct current
Input signal, the winding between transformer 5,6 are used to form output signal, and the winding between transformer 7,8 is used to form output
Signal feedback.Therefore, output signal and the theoretical proportions relationship of direct-flow input signal are by umber of turn and change between transformer 5,6
The ratio of umber of turn determines between depressor 1,2.Theoretical proportions relationship between feedback signal and output signal is by transformer 7,8
Between between umber of turn and transformer 5,6 umber of turn ratio determine.It is closed since three above winding is kept fixed ratio
System, and in such a way that signal transmits in the same direction (such as normal shock, recommend, full-bridge, the topologys such as half-bridge) make feedback signal, output letter
Number ratio being kept fixed with direct-flow input signal.Firstly, adjusting the resistance value of R3 and R4, suitable signal feedback proportional is obtained
K1, K1 are equal to the theoretical proportions of feedback signal and output signal.Then, the resistance value of R2 is adjusted, so that final output signal and straight
The ratio for flowing input signal is equal to desired ratio.Output signal and direct-flow input signal are obtained by voltage isolation picking circuit
Magnetic isolation, but maintain fixed proportionate relationship.
In the DC voltage isolation Acquisition Circuit of the present embodiment, since three windings are kept fixed proportionate relationship, make to feed back
The ratio that signal, output signal and input signal are kept fixed.It is balanced by output signal and feedback signal terminal resistive impedance, school
The just ratio of output signal and input signal.
1) the DC voltage isolation Acquisition Circuit of the present embodiment has the advantages that due to input signal end and acquisition
The direct connection of signal end not electrically can bear the isolation pressure resistance of some strength.2) in high voltage, the environment of high interference
Under, the isolation acquisition of voltage signal can be completed, and guarantee that acquisition precision is good.3) additional power source is not needed, circuit is simple, can be with
Ratio is transmitted according to external environment flexible setting.4) cost is relatively low, small in size.
Feature described in above embodiments, structure or characteristic can be integrated in any other suitable manner one or
In multiple embodiments.In the above description, some concrete details, such as circuit, device etc. are provided, it is practical to this to provide
The comprehensive understanding of novel embodiment.However, it is understood by those of ordinary skill in the art that the utility model is not necessarily to said one or more
A concrete details, which can be realized, or other components, material, method can also be used etc., to be realized.In other instances, known
Structure, material or operation be not shown or described in detail the various aspects in order to avoid fuzzy the utility model.
Claims (3)
1. Acquisition Circuit, including direct current signal input terminal, signal output end is isolated in a kind of DC voltage, which is characterized in that described
DC voltage isolation Acquisition Circuit further includes isolation transfer circuit, current rectifying and wave filtering circuit, output signal feed circuit and driving control
Circuit processed,
Wherein, isolation transfer circuit one end connect with direct current signal input terminal, the other end respectively with current rectifying and wave filtering circuit and output
Signal feedback circuit connection；Current rectifying and wave filtering circuit one end is connect with transfer circuit connection, the other end is isolated with signal output end, is used
In restoring direct-flow input signal in proportion；The first end of output signal feed circuit is connected with transfer circuit is isolated, second end
It is connect with drive control circuit, for generating feedback signal, output signal and direct-flow input signal is made to be kept fixed ratio；Driving
Control circuit one end is connect with transfer circuit connection, the other end is isolated with output signal feed circuit, for according to output signal
The state dynamic of feed circuit adjusts, and makes to be kept fixed ratio between output signal and direct-flow input signal,
Wherein, it is described isolation transfer circuit include the same magnetic core of transformer coiling the first winding, the second winding and third around
Group, wherein the first winding is for detecting direct-flow input signal, the second winding is used to form output signal, and the tertiary winding is used to form
Output signal feedback.
2. Acquisition Circuit is isolated in DC voltage according to claim 1, which is characterized in that the DC voltage isolation acquisition
Circuit further includes balancing circuitry, wherein balancing circuitry includes the first balanced load for output signal feed circuit and uses
In the second balanced load of output signal, balancing circuitry is arranged to compensate for the deviation of device.
3. Acquisition Circuit is isolated in DC voltage according to claim 1, which is characterized in that the DC voltage isolation acquisition
Circuit further includes auxiliary power supply circuit, and auxiliary power supply circuit on one side is connect with direct current signal input terminal, the other end and drive control
Circuit connection, for powering to drive control circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822275940.8U CN209471169U (en) | 2018-12-30 | 2018-12-30 | A kind of DC voltage isolation Acquisition Circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822275940.8U CN209471169U (en) | 2018-12-30 | 2018-12-30 | A kind of DC voltage isolation Acquisition Circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112367072A (en) * | 2020-10-26 | 2021-02-12 | 上海空间电源研究所 | Anti-saturation magnetic isolation circuit |
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2018
- 2018-12-30 CN CN201822275940.8U patent/CN209471169U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112367072A (en) * | 2020-10-26 | 2021-02-12 | 上海空间电源研究所 | Anti-saturation magnetic isolation circuit |
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