CN206850425U - A kind of SENSE distal ends voltage compensating circuit of dc source - Google Patents
A kind of SENSE distal ends voltage compensating circuit of dc source Download PDFInfo
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- CN206850425U CN206850425U CN201720707764.3U CN201720707764U CN206850425U CN 206850425 U CN206850425 U CN 206850425U CN 201720707764 U CN201720707764 U CN 201720707764U CN 206850425 U CN206850425 U CN 206850425U
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Abstract
The SENSE distal ends voltage compensating circuit of a kind of dc source, by SENSE ends series diode D, using the conducting tube voltage drop of diode, the conducting tube voltage drop of the voltage deviation fixed for load end line loss compensation, i.e. compensation diode.Circuit provided by the utility model is by due to pressure drop caused by line loss, improving the degree of accuracy of power output end sampling display under the conduction pipe voltage-drop compensation low-voltage of diode, High-current output situation.Voltage compensating circuit of the present utility model is simple in construction, and the degree of accuracy of power supply real-time display load end true voltage value can be improved by only increasing a pair of diodes, and not interfere with big voltage output.
Description
Technical field
A kind of power supply sample circuit is the utility model is related to, more particularly to one kind is used for dc source SENSE (power supply senses
Should) end voltage sample compensation circuit.
Background technology
When dc source is by electric wire powering load, because certain impedance in itself be present in electric wire, when supply current very
Certain pressure drop can be produced when big, causes the voltage that dc source is shown accurately to represent this ground voltage, it is impossible to be accurate
Represent the voltage of distal end load end.At present, high-precision power generally use four-line measurement distal end output voltage.Four-wire system it is defeated
Going out end includes positive and negative two output ends and two SENSE ends.When tested end is closer to the distance, two SENSE ends respectively with it is positive and negative
Two output end short circuits, accurate measurement can be carried out without SENSE ends.But when tested end is distant, due to line loss now without
Method is ignored, it is therefore necessary to uses four-line measurement output end：Positive output end and+SENSE ends are being connected to load input just simultaneously
Pole, load input negative pole is connected to by negative output terminal and-SENSE ends simultaneously, and distal end compensation resistance R is exported by positive polesense +With
Negative pole output distal end compensation resistance Rsense -Pressure drop caused by compensating line loss.
Power induction (SENSE) pattern can be with compensating wire resistance itself.In the normal mode, voltage is direct by wire
It is carried in load, so as to keep the stabilization of load voltage.Because load current can produce pressure drop in connecting wire, thus it is real
Border load voltage should subtract the pressure drop equal to electric power output voltage.Vload=Vout- Vcable；And Vcable=Iload×RcableOne
A little outputs are low-voltage, the occasion of high current, and the pressure drop formed in the output connecting wire of power supply can not be ignored.As power supply is set
Fixed output is 3.3V/1A, it is assumed that the resistance of output line is 0.3 Europe, 0.3V pressure drop will be formed on wire, then actually arrive
The voltage reached is changed into 3.0V, and this is enough to cause the unit cisco unity malfunction being powered.Now need to mend wire pressure drop
Repay, the four lines measuring method during similar to measuring resistance by using universal meter, SENSE terminals direct measurement load both end voltage can be used.Due to
Electric current very little in SENSE wires, thus caused voltage drop can be ignored, i.e. the voltage Vs of power-supply device sensing is actually
It is real load voltage, such power-supply device will improve the output of oneself, make it equal to wire pressure drop and required load voltage
Sum, so as to realize the compensation for wire pressure drop, load is set really to obtain set magnitude of voltage.
Existing line loss compensation circuit is as shown in Fig. 2 by sensing SENSE ends and power output end VoutBetween set
RsensResistance come compensate because line loss cause distal end voltage to diminish the problem of.Specific method is：Given output DC voltage
Ratio value compensates distal end voltage.Under available circuit structure, distal end compensation resistance R is exported with positive polesense +Distal end is exported with negative pole
Compensate resistance Rsense -Exemplified by any one compensation resistance calculating process formula：
Compensate the voltage V of resistancesense=Rsense* Is=Rcable*Imax=Vcmax
Rsense=Rcable*Imax/Is；
Actual offset voltage V calculation formula are as follows：
K1=Vsense/Voutmax,
V=Vout*K1
Above-mentioned RcableIt is line impedence, the I of transmission electric wiremaxIt is to flow through distal end for the maximum output current of dc source, Is
Compensate resistance Rsense +Or Rsense -Electric current, VcmaxIt is maximum line loss voltage.
Assuming that the output voltage V of a dc sourceOUTIt is adjustable for 0-80V, maximum output current Imax=100A, dc source
Hold the line impedence R of load end transmission electric wirecable=10m Ω, a distal end compensation resistance R in power supply is flowed through in engineeringsenseElectricity
Flow IsIt is typically designed as 1mA, then Rsense +Or Rsense -Resistance Rsense=Rcable*Imax/Is=10m Ω * 100A/1mA=
1000Ω.Compensate the voltage V of resistancesense=Rsense*IS=Rcable*Imax=1V, the penalty coefficient K1=V of power supplysense/
Voutmax=1/80=1.25%, i.e. this dc source pass through Rsense +Or Rsense -Penalty coefficient be 1.25%.Offset voltage V
=Vout* K1=Vout*Vsense/Voutmax。
When the timing of output current one, with output voltage VoutReduction, offset voltage V reduce, when offset voltage be less than pass
During line loss voltage on power transmission line, such as work as Vout=1V, IoutDuring=100A, V=1V*1.25%=0.0125V, with reality
Line loss 1V is compared to difference 0.9875V.
As can be seen here, existing voltage compensation circuit is only applicable to high voltage, the situation of low current output, in the big electricity of low-voltage
During stream output, the magnitude of voltage of output display circuit sampling acquisition differs with practical line loss value can not ignore.
The degree of accuracy shown is sampled further to improve power output end in the case of low-voltage and high-current output, is badly in need of at present
Dc source SENSE distal ends voltage compensating circuit is improved.
The content of the invention
In order to solve the shortcomings of the prior art, the purpose of this utility model is to provide a kind of dc source
SENSE distal ends voltage compensating circuit, the voltage deviation fixed for load end line loss compensation, improve power output end sampling display
The degree of accuracy.
To achieve the above object, the SENSE distal ends voltage compensating circuit of dc source provided by the utility model, including just
Pole output distal end compensation resistance Rsense +, negative pole output distal end compensation resistance Rsense -, cathode output end Vout +, cathode output end
Vout -, far-end measuring anode VS +With far-end measuring negative terminal VS -, it is characterised in that the positive pole output distal end compensation resistance Rsense +
With the far-end measuring anode VS +Between and negative pole output distal end compensation resistance Rsense -With the far-end measuring negative terminal
VS -Between be respectively in series with voltage compensation module.Wherein, the voltage compensation module only needs that the offset voltage of fixation can be provided
, can specifically use diode, set the triode or other devices that there is fixed voltage to export of biasing circuit.
Further, in foregoing circuit, the voltage compensation module is the positive one or more diode D to connect.
The diode D can use the one or more in germanium diode or silicon diode.
Specifically, the germanium diode in foregoing circuit is 1N60P；The silicon diode is 1N4148W.
The utility model is compared with existing scheme and had the following technical effect that:
1. the utility model is when SENSE ends are by adding a fixed offset to ensure output voltage very little, electricity
The compensation distal end voltage that source can be still closer to, increases the distal end compensation ability in small voltage output, reaches compensation more
Add accurate effect；
2. specifically, the utility model realizes above-mentioned voltage compensating function by the conducting tube voltage drop of diode, compensate
Due to pressure drop caused by line loss under low-voltage, High-current output situation, the degree of accuracy that power output end sampling is shown is improved；
3. the utility model circuit structure is simple, can pass through without increasing supporting biasing circuit or extra loop
Simple series compensating voltage offset, while the degree of accuracy of power supply real-time display load end true voltage value is improved, no
Big voltage output can be influenceed.
Other features and advantages of the utility model will illustrate in the following description, also, partly from specification
In become apparent, or by implement the present invention and understand.
Brief description of the drawings
Accompanying drawing is used for providing and further understanding to of the present utility model, and a part for constitution instruction, and with this reality
With new embodiment together, for explaining the utility model, do not form to limitation of the present utility model.In the accompanying drawings：
Fig. 1 is according to SENSE distal ends voltage compensating principle schematic diagram of the present utility model；
Fig. 2 is existing SENSE distal ends voltage compensating circuit schematic diagram.
Embodiment
Preferred embodiment of the present utility model is illustrated below in conjunction with accompanying drawing, it will be appreciated that described herein excellent
Select embodiment to be merely to illustrate and explain the utility model, be not used to limit the utility model.
Fig. 1 is according to SENSE distal ends voltage compensating principle schematic diagram of the present utility model, as shown in figure 1, the utility model
Dc source SENSE distal ends voltage compensating circuit, including, positive pole output distal end compensation resistance Rsense +, negative pole output distal end
Compensate resistance Rsense -, cathode output end Vout +, cathode output end Vout -, far-end measuring anode VS +With far-end measuring negative terminal VS -, its
It is characterised by, the positive pole output distal end compensation resistance Rsense +With the far-end measuring anode VS +Between and the negative pole it is defeated
Go out distal end compensation resistance Rsense -With the far-end measuring negative terminal VS -Between be respectively in series with voltage compensation module.Wherein, it is described
Voltage compensation module only needs that the offset voltage of fixation can be provided, and can specifically use diode, set the three of biasing circuit
Pole pipe or other have fixed voltage export device.
In the present embodiment, the voltage compensation module is using diode D, the model 1N4148W of positive series connection, conducting pressure
It is reduced to 0.715V.It will be appreciated by those skilled in the art that due to germanium diode, such as 1N60P, 0.24V conducting can be equally provided
Tube voltage drop, maximum conduction voltage drop is 0.5V, thus can also be used for this circuit.
The course of work of the system is exemplified below：
In the present embodiment, respectively in Rsense+,Rsense -With distal end sampling section VS +,VS -One diode of series connection, can be mended
Repay a fixed voltage deviation Vb=0.7V (Vb is the conduction voltage drop of diode).
Vsense+ Vb=Rsense*Is+ 0.7=Rcable*Imax=Vcmax
Rsense=(Rcable*Imax-0.7)/Is,
K2=(Vcmax-0.7)/Voutmax
V=Vout*K2+0.7
Still using as above data, a kind of output voltage VO UT of dc source is adjustable for 0-80V, maximum output current Imax
=100A, the line impedence R of DC power supply terminal to load end transmission electric wirecable=10m Ω, engineering upstream end compensating resistance too far
SENSE electric current IsIt is typically designed as 1mA, then Rsense +And Rsense -Resistance Rs=(Rcable*Imax-0.7)/Is=(10m
Ω * 100A-0.7)/1mA=300 Ω.
Penalty coefficient K2=(1-0.7) V/80V=0.375% being computed in the present invention,
The timing of output current one, with output voltage Vout reduction, offset voltage V is reduced, and such as works as Vout=1V, Iout=
During 100A, V=1V*0.375%+0.7=0.70375V, the line loss 1V with reality is compared to difference 0.29625V, compared with traditional scheme
Compared to compensate for 0.69125V, theoretical and real data, which calculates, proves that by dosing diode the compensation of power supply distal end can be increased more
Ability, offset is more nearly real line loss.
In the case of low current output, because circuit line loss is small, this circuit does not interfere with output end voltage.The utility model
Circuit structure is simple, can be inclined by simple series compensating voltage without increasing supporting biasing circuit or extra loop
Shifting amount, while the degree of accuracy of power supply real-time display load end true voltage value is improved, big voltage output is not interfered with.
One of ordinary skill in the art will appreciate that：Preferred embodiment of the present utility model is the foregoing is only, and
Limitation the utility model is not used in, although the utility model is described in detail with reference to the foregoing embodiments, for ability
For the technical staff in domain, its technical scheme that can be still recorded to foregoing embodiments is modified, or to its middle part
Technical characteristic is divided to carry out equivalent substitution.All any modifications within the spirit and principles of the utility model, made, equally replace
Change, improve, should be included within the scope of protection of the utility model.
Claims (5)
1. a kind of SENSE distal ends voltage compensating circuit of dc source, including positive pole output distal end compensation resistance Rsense +, negative pole
Output distal end compensation resistance Rsense -, cathode output end Vout +, cathode output end Vout -, far-end measuring anode VS +And far-end measuring
Negative terminal VS -, it is characterised in that the positive pole output distal end compensation resistance Rsense +With the far-end measuring anode VS +Between and
The negative pole output distal end compensation resistance Rsense -With the far-end measuring negative terminal VS -Between be respectively in series with voltage compensation mould
Block.
2. the SENSE distal ends voltage compensating circuit of dc source as claimed in claim 1, it is characterised in that the voltage is mended
Repay one or more diode Ds of the module for positive series connection.
3. the SENSE distal ends voltage compensating circuit of dc source as claimed in claim 2, it is characterised in that the diode D
For the one or more in germanium diode or silicon diode.
4. the SENSE distal ends voltage compensating circuit of dc source as claimed in claim 3, it is characterised in that the pole of germanium two
Manage as 1N60P.
5. the SENSE distal ends voltage compensating circuit of dc source as claimed in claim 3, it is characterised in that the pole of silicon two
Manage as 1N4148W.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720707764.3U CN206850425U (en) | 2017-06-17 | 2017-06-17 | A kind of SENSE distal ends voltage compensating circuit of dc source |
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|---|---|---|---|
| CN201720707764.3U CN206850425U (en) | 2017-06-17 | 2017-06-17 | A kind of SENSE distal ends voltage compensating circuit of dc source |
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| CN206850425U true CN206850425U (en) | 2018-01-05 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108733117A (en) * | 2018-04-28 | 2018-11-02 | 北京机械设备研究所 | A kind of line drop control device of servo mechanism power supply distal end voltage stabilizing |
| CN109358693A (en) * | 2018-10-31 | 2019-02-19 | 北京机械设备研究所 | A kind of thermal cell activation power supply and its distal line voltage-drop compensation device |
| CN109738736A (en) * | 2018-12-07 | 2019-05-10 | 中电科仪器仪表(安徽)有限公司 | A kind of SENSE circuit |
| CN110726951A (en) * | 2019-10-10 | 2020-01-24 | 深圳市航天新源科技有限公司 | Method for detecting connection state of power supply far-end voltage compensation end |
| CN110762794A (en) * | 2019-10-31 | 2020-02-07 | 广东美的制冷设备有限公司 | Power supply voltage determining method and device, compressor and air conditioner |
-
2017
- 2017-06-17 CN CN201720707764.3U patent/CN206850425U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108733117A (en) * | 2018-04-28 | 2018-11-02 | 北京机械设备研究所 | A kind of line drop control device of servo mechanism power supply distal end voltage stabilizing |
| CN109358693A (en) * | 2018-10-31 | 2019-02-19 | 北京机械设备研究所 | A kind of thermal cell activation power supply and its distal line voltage-drop compensation device |
| CN109738736A (en) * | 2018-12-07 | 2019-05-10 | 中电科仪器仪表(安徽)有限公司 | A kind of SENSE circuit |
| CN109738736B (en) * | 2018-12-07 | 2021-01-15 | 中电科仪器仪表(安徽)有限公司 | SENSE circuit |
| CN110726951A (en) * | 2019-10-10 | 2020-01-24 | 深圳市航天新源科技有限公司 | Method for detecting connection state of power supply far-end voltage compensation end |
| CN110762794A (en) * | 2019-10-31 | 2020-02-07 | 广东美的制冷设备有限公司 | Power supply voltage determining method and device, compressor and air conditioner |
| CN110762794B (en) * | 2019-10-31 | 2021-07-20 | 广东美的制冷设备有限公司 | Power supply voltage determining method and device, compressor and air conditioner |
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