CN106325343A - Power supply device with electric wire drop compensation - Google Patents
Power supply device with electric wire drop compensation Download PDFInfo
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- CN106325343A CN106325343A CN201510340472.6A CN201510340472A CN106325343A CN 106325343 A CN106325343 A CN 106325343A CN 201510340472 A CN201510340472 A CN 201510340472A CN 106325343 A CN106325343 A CN 106325343A
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Abstract
The invention provides a power supply device with electric wire drop compensation. The power supply device comprises a first power source pin, a second power source pin, a direct current output voltage stabilizer, a current sensing circuit and a compensation circuit, wherein the first power source pin and the second power source pin are coupled to external loads by a first wire and a second wire respectively; the direct current output voltage stabilizer receives an input voltage and a feedback voltage, and generates an output voltage and an output current on the basis; the current sensing circuit is used to sense the output current and generate a sensing voltage on the basis; the compensation circuit responds to the sensing voltage so as to generate a compensation voltage, wherein the compensation voltage is equal to the sum of a voltage drop of the first wire and a voltage drop of the second wire; and the compensation circuit compensates the output voltage according to the compensation voltage, so that a load voltage of the external loads can be maintained at a stable voltage value.
Description
Technical field
The invention relates to a kind of power supply device, and mend in particular to one tool electric wire pressure drop
The power supply device repaid.
Background technology
In general, power supply device mostly can pass through power transmission line (cable) be couple to load (example
Such as electronic installations such as mobile phone, panel computer, notebook computer or portable power sources), so that load is powered
(or charging).But, power transmission line itself is generally of impedance.When load increase makes to be passed by power supply
When the electric current of defeated line becomes big, the impedance on the circuit of power transmission line own or the joint of power transmission line will
Obvious voltage drop can be produced.The output voltage provided due to power supply device is usually definite value, because of
This, the load voltage being sent to load end by power transmission line be will be with the increase of electric current and declines.
Consequently, it is possible to can the electronic installation that may have influence on load end normally operate (or charging).Especially,
Once on power transmission line, produced voltage drop is excessive so that the load voltage values received by load end
When being down to below electronic installation permissible minimum value, even can make the electronic installation of load end
Decommission.
Therefore, in general application, it will usually use extra detection wire (sensing wire) to be connected to
Load end, to detect the load voltage of load end.But, this extra detection wire may reduce electricity
The trustworthiness of source transmission line and the cost of power transmission line can be increased.Therefore, extra inspection is not being used
On the premise of surveying wire, how to reduce the impact on the voltage of load end of the voltage drop on power transmission line,
To improve the degree of stability of voltage of load end, it it is one of important topic of being faced of this area.
Summary of the invention
In view of this, the one exemplary embodiment of the present invention provides a kind of power supply supply having electric wire voltage-drop compensation
Device, the output electric current so as to detection power supply device compensates voltage to produce one, and compensates according to this
The output voltage of power supply device is compensated by voltage, to improve the degree of stability of the voltage of load end.
The power supply device of the tool electric wire voltage-drop compensation of one one exemplary embodiment of the present invention may be used to power supply
To external loading.This power supply device can include that the first power pin, second source pin, direct current are defeated
Go out manostat, current sensing circuit and compensate circuit.First power pin may be used to by the first wire
It is couple to the first power supply contact of external loading.Second source pin may be used to be couple to by the second wire
The second source contact of external loading.Direct current output voltage stabilizer may be used to receive input voltage and feedback voltage,
And produce output voltage and output electric current according to this.Current sensing circuit can be coupled in direct current output voltage stabilizer
With sensing output electric current between output voltage terminal and the first power pin, or it is coupled in direct current output voltage stabilizing
With sensing output electric current between reference voltage end and the second source pin of device, and produce sensing voltage according to this.
Compensate circuit and can be couple to current sensing circuit to receive sensing voltage.Compensate circuit and can be coupled in the first electricity
Between source pin and second source pin or be coupled in output voltage terminal and the direct current of direct current output voltage stabilizer
To produce feedback voltage between the reference voltage end of output voltage stabilizer.Compensate circuit and can react on sensing voltage
Compensate voltage to produce, and use this compensation voltage that output voltage is compensated.Compensating voltage can be
The voltage drop of the first wire and the voltage drop sum of the second wire.
In one embodiment of this invention, above-mentioned current sensing circuit can be coupled in direct current output voltage stabilizer
Output voltage terminal and the first power pin between.The reference voltage end of direct current output voltage stabilizer can be couple to
Second source pin.Current sensing circuit can include detecting resistance and subtractor.Detection resistance can couple
With detection output electric current between the output voltage terminal and the first power pin of direct current output voltage stabilizer.Subtraction
Device can be couple to the two ends detecting resistance and carry out subtraction with the voltage at two ends to detection resistance, and according to
To produce sensing voltage.
In one embodiment of this invention, above-mentioned subtractor can include operational amplifier, the first resistance,
Second resistance, the 3rd resistance and the 4th resistance.The outfan of operational amplifier may be used to produce sensing electricity
Pressure.First resistance can be coupled in the output voltage terminal of direct current output voltage stabilizer and the noninverting of operational amplifier
Between input.Second resistance can be coupled in non-inverting input and the second source pin of operational amplifier
Between.3rd resistance can be coupled between the first power pin and the inverting input of operational amplifier.The
Four resistance can be coupled between the inverting input of operational amplifier and the outfan of operational amplifier.
In one embodiment of this invention, above-mentioned compensation circuit can be coupled in the defeated of direct current output voltage stabilizer
Go out between the reference voltage end of voltage end and direct current output voltage stabilizer.Compensate circuit and can include that voltage is to electric current
Transducer, compensation resistance and bleeder circuit.The input of voltage-to-current converter can be couple to electric current
Sensing circuit is to receive sensing voltage, and produces setting electric current according to this.It is defeated that compensation resistance can be coupled in direct current
Go out between the output voltage terminal of manostat and the outfan of voltage-to-current converter.Compensation resistance may be used to
React on setting electric current and produce compensation voltage.Bleeder circuit can be coupled in the defeated of voltage-to-current converter
Go out between end and the reference voltage end of direct current output voltage stabilizer, produce in order to react on this compensation voltage anti-
Feedthrough voltage.
In one embodiment of this invention, above-mentioned voltage-to-current converter can include voltage follower
(Voltage follower) and setting resistance.The first input end of voltage follower may be used to receive sensing electricity
Pressure is using as setting voltage.The outfan of voltage follower can be couple to the output of voltage-to-current converter
End.Set resistance and can be coupled in the second input of voltage follower and the reference electricity of direct current output voltage stabilizer
Between pressure side.Set resistance to may be used to react on setting voltage to produce setting electric current.
In one embodiment of this invention, above-mentioned voltage follower can include operational amplifier and crystal
Pipe.The non-inverting input of operational amplifier can be couple to the first input end of voltage follower.Computing is put
The inverting input of big device can be couple to the second input of voltage follower.The control end of transistor can coupling
Receive the outfan of operational amplifier.First end of transistor can be couple to the outfan of voltage follower.
Second end of transistor can be couple to the inverting input of operational amplifier.
In one embodiment of this invention, above-mentioned bleeder circuit can include the first resistance and the second resistance.
First resistance can be coupled in the outfan of voltage-to-current converter and direct current output voltage stabilizer feedback end it
Between.Second resistance can be coupled in the feedback end of direct current output voltage stabilizer and the reference electricity of direct current output voltage stabilizer
Between pressure side.
In one embodiment of this invention, above-mentioned compensation circuit can be coupled in the first power pin and second
Between power pin.Compensate circuit to include voltage-to-current converter, compensate resistance and bleeder circuit.
The input of voltage-to-current converter can be couple to current sensing circuit and sense voltage to receive, and according to this
Produce and set electric current.Compensate resistance and can be coupled in the output of the first power pin and voltage-to-current converter
Between end.Compensate resistance to may be used to react on setting electric current and produce compensation voltage.Bleeder circuit can couple
Between the outfan and second source pin of voltage-to-current converter, in order to react on this compensation voltage
And produce feedback voltage.
In one embodiment of this invention, above-mentioned voltage-to-current converter can include voltage follower with
And setting resistance.The first input end of voltage follower may be used to receive sensing voltage using as setting voltage.
The outfan of voltage follower can be couple to the outfan of voltage-to-current converter.Set resistance can couple
Between second input and second source pin of voltage follower.Setting resistance may be used to react on and sets
Determine voltage and set electric current to produce.
In one embodiment of this invention, above-mentioned voltage follower can include operational amplifier and crystal
Pipe.The non-inverting input of operational amplifier can be couple to the first input end of voltage follower.Computing is put
The inverting input of big device can be couple to the second input of voltage follower.The control end of transistor can coupling
Receive the outfan of operational amplifier.First end of transistor can be couple to the outfan of voltage follower.
Second end of transistor can be couple to the inverting input of operational amplifier.
In one embodiment of this invention, above-mentioned bleeder circuit can include the first resistance and the second resistance.
First resistance can be coupled in the outfan of voltage-to-current converter and direct current output voltage stabilizer feedback end it
Between.Second resistance can be coupled between the feedback end of direct current output voltage stabilizer and second source pin.
In one embodiment of this invention, above-mentioned current sensing circuit can be coupled in direct current output voltage stabilizer
Reference voltage end and second source pin between.The output voltage terminal of direct current output voltage stabilizer can be couple to
First power pin.Current sensing circuit can include detecting resistance and subtractor.Detection resistance can couple
With detection output electric current between the reference voltage end and second source pin of direct current output voltage stabilizer.Subtraction
Device can be couple to the two ends detecting resistance and carry out subtraction with the voltage at two ends to detection resistance, and according to
To produce sensing voltage.
In one embodiment of this invention, above-mentioned subtractor can include operational amplifier, the first resistance,
Second resistance, the 3rd resistance and the 4th resistance.The outfan of operational amplifier may be used to produce sensing electricity
Pressure.First resistance can be coupled between second source pin and the non-inverting input of operational amplifier.The
Two resistance can be coupled in the non-inverting input of operational amplifier and the reference voltage end of direct current output voltage stabilizer
Between.3rd resistance can be coupled in the reference voltage end of direct current output voltage stabilizer and the anti-phase of operational amplifier
Between input.4th resistance can be coupled in the inverting input of operational amplifier and the defeated of operational amplifier
Go out between end.
Based on above-mentioned, in the above embodiment of the present invention, power supply can be detected by current sensor and supply
Answer the output electric current (namely being supplied to the load current of external loading) of device.When the output current increases, mend
The current value setting electric current repaid in circuit increases the most in certain proportion so that compensate produced by circuit
The magnitude of voltage compensating voltage is consequently increased.Even if consequently, it is possible to output electric current changes makes the first wire
The voltage drop of voltage drop and the second wire change therewith, compensate circuit and still can produce correspondingly sized compensation
Voltage is to carry out dynamic compensation to output voltage, so that load voltage maintains stable magnitude of voltage.Cause
This, when power supply device is in high capacity, the degree of stability of load voltage still can promote effectively, and can
Improve the problem that load end causes load voltage moment to decline because momentary load sharply increases.In addition,
The power supply device of the above embodiment of the present invention need not use extra detection wire to detect load end
Voltage, therefore the trustworthiness of the wire of power supply device can be increased and reduce cost and the size of wire.
For the features described above of the present invention and advantage can be become apparent, special embodiment below, and coordinate
Accompanying drawing is described in detail below.
Accompanying drawing explanation
Figure below is a part for the description of the present invention, it is shown that the example embodiment of the present invention,
Accompanying drawing illustrates the principle of the present invention together with the description of description.
Fig. 1 is showing of the power supply device 100 of the tool electric wire voltage-drop compensation shown in one embodiment of the invention
It is intended to；
Fig. 2 is the power supply device 200 of the tool electric wire voltage-drop compensation shown in another embodiment of the present invention
Schematic diagram；
Fig. 3 is the power supply device 300 of the tool electric wire voltage-drop compensation shown in further embodiment of this invention
Schematic diagram；
Fig. 4 is the power supply device 400 of the tool electric wire voltage-drop compensation shown in further embodiment of this invention
Schematic diagram.
Description of reference numerals:
100,200,300,400: power supply device；
110: direct current output voltage stabilizer；
120,120 ': current sensing circuit；
121,121 ': subtractor；
130,130 ': compensate circuit；
131: voltage-to-current converter；
131_1: voltage follower；
135: bleeder circuit；
900: external loading；
CN1: the first power supply contact；
CN2: second source contact；
FB: feedback end；
Ifb: electric current；
Iout: output electric current；
Iset: set electric current；
OP1, OP2: operational amplifier；
OUT: output voltage terminal；
P1: the first power pin；
P2: second source pin；
Q: transistor；
R1, Ra: the first resistance；
R2, Rb: the second resistance；
R3: compensate resistance；
Rc: the three resistance；
Rd: the four resistance；
Rdet: detection resistance；
Rset: set resistance；
RW1, RW2: resistance；
Vcmp: compensate voltage；
Vd: voltage difference；
Vdc, Vdc ': DC voltage；
Vfb: feedback voltage；
Vin: input voltage；
VL: load voltage；
VO, VO ': output voltage；
Vsen: sensing voltage；
Vset: setting voltage；
VSS: reference voltage end；
VW1, VW2: voltage drop；
W1: the first wire；
W2: the second wire.
Detailed description of the invention
In order to make present disclosure to be easier to understand, true as the present invention especially exemplified by embodiment below
The example can implemented according to this in fact.It addition, in place of all possibilities, use identical in drawings and the embodiments
Element/component/the step of label, represents same or like parts.
Hereinafter refer to the power supply that Fig. 1, Fig. 1 are the tool electric wire voltage-drop compensations shown in one embodiment of the invention
The schematic diagram of feeding mechanism 100.As it is shown in figure 1, power supply device 100 can be to external loading 900
It is powered.External loading 900 can be for example mobile phone, panel computer, notebook computer or portable power source
Deng electronic installation, but the present invention is not limited thereto.Power supply device 100 can include that the first power supply connects
Foot P1, second source pin P2, direct current output voltage stabilizer 110, current sensing circuit 120 and compensation
Circuit 130, but it is not limited to this.First power pin P1 and second source pin P2 can have different
Polarity of voltage.
First power pin P1 may be used to be couple to the first electricity of external loading 900 by the first wire W1
Source contact CN1.Second source pin P2 may be used to be couple to external loading 900 by the second wire W2
Second source contact CN2.First power supply contact CN1 can have different with second source contact CN2
Polarity of voltage.First wire W1 can have a resistance RW1, and the second wire W2 can have an electricity
Resistance RW2.Direct current output voltage stabilizer 110 may be used to receive an input voltage vin and a feedback voltage Vfb,
And produce DC voltage Vdc (i.e. output voltage VO) and output electric current Iout, wherein input voltage vin according to this
Can be DC source or alternating current power supply.
The output electric current Iout exported when power supply device 100 is negative by the first wire W1, outside
Carry 900 and second wire W2 and when being back to power supply device 100, will be at the first wire W1
Produce a voltage drop VW1, and produce a voltage drop VW2 at the second wire W2, wherein voltage drop VW1,
The numerical value of VW2 is directly proportional to output electric current Iout.Therefore, the first power supply contact of external loading 900
Load voltage VL between CN1 and second source contact CN2 will less than the first power pin P1 with
Output voltage VO between second source pin P2, and load voltage VL will be with export electric current Iout
Size of current and change.
In order to load voltage VL can be kept in the case of the current value of any output electric current Iout
Stable, in the present embodiment, reference voltage end VSS of direct current output voltage stabilizer 110 can be directly coupled to
Second source pin P2.Current sensing circuit 120 can be coupled in the output electricity of direct current output voltage stabilizer 110
With sensing output electric current Iout between pressure side OUT and the first power pin P1, and produce sensing electricity according to this
Pressure Vsen.And compensate circuit 130 and can be couple to current sensing circuit 120 to receive sensing voltage Vsen.
In addition, compensate circuit 130 can be coupled in the output voltage terminal OUT of direct current output voltage stabilizer 110 with
To produce feedback voltage Vfb between reference voltage end VSS of direct current output voltage stabilizer 110.Direct current exports
The output voltage terminal OUT of manostat 110 and reference voltage end VSS can have different polarity of voltage.
Particularly, compensation circuit 130 can react on sensing voltage Vsen and compensate voltage Vcmp, with right to produce
Output voltage VO between first power pin P1 and second source pin P2 compensates, and wherein mends
Repay voltage drop VW1 and the voltage drop VW2 of the second wire W2 that voltage Vcmp is the first wire W1
Sum.
In one embodiment of this invention, as in figure 2 it is shown, current sensing circuit 120 can include detection electricity
Resistance Rdet and subtractor 121, but it is not limited to this.Detection resistance Rdet can be coupled in direct current output voltage stabilizing
With detection output electric current Iout between the output voltage terminal OUT and the first power pin P1 of device 110.Subtract
Musical instruments used in a Buddhist or Taoist mass 121 can be couple to the two ends detecting resistance Rdet and enter with the voltage to the two ends of detection resistance Rdet
Row subtraction (such as voltage difference Vd shown in Fig. 2), and produce sensing voltage Vsen according to this.
Subtractor 121 can include operational amplifier OP1, the first resistance Ra, the second resistance Rb, the 3rd
Resistance Rc and the 4th resistance Rd, but it is not limited to this.The outfan of operational amplifier OP1 is in order to produce
Sensing voltage Vsen.First resistance Ra is coupled in the output voltage terminal OUT of direct current output voltage stabilizer 110
And between the non-inverting input of operational amplifier OP1.Second resistance Rb is coupled in operational amplifier OP1
Non-inverting input and second source pin P2 between.3rd resistance Rc is coupled in the first power pin
Between the inverting input of P1 and operational amplifier OP1.4th resistance Rd is coupled in operational amplifier
Between inverting input and the outfan of operational amplifier OP1 of OP1.
On the other hand, compensate circuit 130 can include voltage-to-current converter 131, compensate resistance R3 with
And bleeder circuit 135.The input of voltage-to-current converter 131 is couple to current sensing circuit 120
To receive sensing voltage Vsen, and produce setting electric current Iset according to this.It is defeated that compensation resistance R3 is coupled in direct current
Go out between the output voltage terminal OUT of manostat 110 and the outfan of voltage-to-current converter 131.Mend
Repay resistance R3 and produce compensation voltage Vcmp in order to react on setting electric current Iset.Bleeder circuit 135 can
It is coupled in the outfan of voltage-to-current converter 131 and the reference voltage end of direct current output voltage stabilizer 110
To produce feedback voltage Vfb between VSS.
Voltage-to-current converter 131 can include voltage follower (Voltage follower) 131_1 and set
Determine resistance Rset, but be not limited to this.The first input end of voltage follower 131_1 may be used to receive sensing
Voltage Vsen is using as setting voltage Vset.The outfan of voltage follower 131_1 can be couple to voltage extremely
The outfan of current converter 131.Set resistance Rset and can be coupled in the second of voltage follower 131_1
Between reference voltage end VSS of input and direct current output voltage stabilizer 110, may be used to react on setting electricity
Pressure Vset sets electric current Iset to produce.
Voltage follower 131_1 can include operational amplifier OP2 and transistor Q, wherein transistor Q
Can be bipolar junction transistors (BJT) or metal-oxide half field effect transistor (MOSFET), but be not limited to this.
The non-inverting input of operational amplifier OP2 is couple to the first input end of voltage follower 131_1.Fortune
The inverting input calculating amplifier OP2 is couple to second input of voltage follower 131_1.Transistor
The end that controls of Q is couple to the outfan of operational amplifier OP2.First end of transistor Q is couple to voltage
The outfan of follower 131_1.Second end of transistor Q is couple to the anti-phase defeated of operational amplifier OP2
Enter end.
Bleeder circuit 135 can include the first resistance R1 and the second resistance R2.First resistance R1 couples
Between the outfan and the feedback end FB of direct current output voltage stabilizer 110 of voltage-to-current converter 131.
Second resistance R2 is coupled in feedback end FB and the direct current output voltage stabilizer 110 of direct current output voltage stabilizer 110
Reference voltage end VSS between.
Running below for the power supply device 100 shown in Fig. 1 illustrates.Say for convenience
Bright, below in an example, it is assumed that the first resistance Ra in subtractor 121, the second resistance Rb,
The resistance value of the 3rd resistance Rc and the 4th resistance Rd is the most identical, and the first resistance of bleeder circuit 135
The resistance value of R1 and the second resistance R2 is greatly in the resistance value of setting resistance Rset, therefore flows into bleeder circuit
The electric current Ifb of 135 is negligible, but the present invention is not limited thereto.In the case, current sense
Circuit 120 produced sensing voltage Vsen is by voltage difference Vd equal to detection resistance Rdet two ends.Separately
Outward, negative feedback characteristic based on voltage follower 131_1, therefore setting voltage Vset is substantially equal to sensing
Voltage Vsen.Therefore set electric current Iset can as shown in formula (1), setting voltage Vset can as shown in formula (2),
And compensate voltage Vcmp can be as shown in formula (3).
Iset=Vset ÷ Rset formula (1)
Vset=Vsen=Vd=Iout × Rdet formula (2)
Vcmp=Iset × R3 formula (3)
If formula (1) and formula (2) are substituted into formula (3), then compensating voltage Vcmp can be as shown in formula (4).
Vcmp=Iout × ((Rdet × R3) ÷ Rset) formula (4)
When external loading 900 not power consumption, namely when output electric current Iout is zero, detect resistance Rdet
Voltage difference Vd at two ends is zero so that setting voltage Vset is zero, therefore sets electric current Iset as zero.This
Time, compensate and compensation voltage Vcmp on resistance R3, will not be produced.In addition, the first wire W1
The voltage drop VW2 of voltage drop VW1 and the second wire W2 is zero (because output electric current Iout is zero),
Therefore, equal to output voltage VO, load voltage VL will that is to say that direct current output voltage stabilizer 110 is produced
DC voltage Vdc, as shown in formula (5).
VL=VO=Vdc=(1+ ((R1+R3) ÷ R2)) × Vfb formula (5)
Relatively, when external loading 900 because of come into operation and during power consumption, namely output electric current Iout
During more than zero, according to formula (4), compensate and will produce, on resistance R3, the compensation voltage Vcmp being not zero.This
Time, the DC voltage Vdc ' after direct current output voltage stabilizer 110 is compensated as shown in formula (6), and will compensate
After output voltage VO ' then as shown in formula (7).
Vdc '=(1+ ((R1+R3) ÷ R2)) × Vfb+Vcmp formula (6)
VO '=Vdc '-Vd formula (7)
In addition, the voltage drop VW1 and the voltage drop VW2 of the second wire W2 of the first wire W1
Can be respectively as shown in formula (8) and formula (9).In order to allow load voltage VL can keep stable, namely no matter export
How the size of current of electric current Iout changes, and load voltage VL can be stable at
((1+ ((R1+R3) ÷ R2)) × Vfb) (i.e. output electric current Iout is the magnitude of voltage of load voltage VL when zero),
Therefore formula (10) can be set up.Formula (6), (7) are substituted into the available formula (11) of formula (10).By formula (4), (8), (9)
And voltage difference Vd=Iout × Rdet substitutes into the available formula (12) of formula (11).
VW1=Iout × RW1 formula (8)
VW2=Iout × RW2 formula (9)
VL=VO '-VW1-VW2=((1+ ((R1+R3) ÷ R2)) × Vfb) formula (10)
Vcmp-Vd=VW1+VW2 formula (11)
((Rdet × R3) ÷ Rset)-Rdet=RW1+RW2 formula (12)
As long as it follows that by the resistance RW1 and the electricity of the second wire W2 that measure the first wire W1
The resistance value of resistance RW2, and by adjusting detection resistance Rdet, compensating resistance R3 and set resistance
The resistance value of Rset, to meet the condition of formula (12), can produce corresponding compensation voltage Vcmp with to defeated
Go out voltage VO to compensate, so that load voltage VL keeps stable.
For example, in the above-described embodiments, it is assumed that direct current output voltage stabilizer 110 may be used to produce 5 volts
Special DC voltage Vdc, the resistance value of the resistance RW1 of the first wire W1 is 0.2 ohm (Ω), and the
The resistance value of the resistance RW2 of two wire W2 is 0.2 ohm.In order to meet formula (12), detect resistance Rdet
Resistance value can be 0.01 ohm, set resistance Rset resistance value can be 2.5 kilohms (K Ω), and mend
The resistance value repaying resistance R3 can be 102.5 kilohms, but is not limited to this.
When external loading 900 not power consumption, namely output electric current Iout is 0 ampere-hour, detection electricity
Voltage difference Vd at resistance Rdet two ends is 0 volt, therefore sets electric current Iset as 0 ampere.Now, compensate
Compensation voltage Vcmp will not be produced on resistance R3.In addition, the voltage drop of the first wire W1
The voltage drop VW2 of VW1 and the second wire W2 is 0 volt, and therefore, load voltage VL is equal to
Output voltage VO, is also equal to DC voltage Vdc produced by direct current output voltage stabilizer 110 and (is 5 volts
Special).
On the other hand, when external loading 900 because of come into operation and during power consumption, it is assumed herein that output electricity
Stream Iout is 1 ampere, then the voltage drop VW1 of the first wire W1 and the voltage drop of the second wire W2
VW2 is 0.2 volt, and detects voltage difference Vd at resistance Rdet two ends, sensing voltage Vsen and set
Determine voltage Vset and be all 0.01 volt.Consequently, it is possible to transistor Q will be switched on and set electric current Iset
It it is 0.004 milliampere.Now, compensating will be because setting electric current Iset (being 0.004 milliampere) on resistance R3
Flowing through and producing compensation voltage Vcmp is 0.41 volt.Now, the direct current of direct current output voltage stabilizer 110
Voltage Vdc is drawn high (or being compensated) to 5.41 volts because compensating voltage Vcmp and being 0.41 volt.By
Voltage difference Vd in detection resistance Rdet two ends is 0.01 volt, therefore the output voltage VO after compensating '
It it is 5.4 volts.Output voltage VO after compensation ' deduction the first wire W1 voltage drop VW1 with
In the case of the voltage drop VW2 (being all 0.2 volt) of the second wire W2, load voltage VL is still 5
Volt.
At this it is noted that owing to voltage difference Vd at the two ends of detection resistance Rdet is generally the least,
Therefore voltage difference Vd in formula (7) and formula (11) is the most negligible.Therefore, voltage Vcmp essence is compensated
On can be considered the voltage drop VW2 sum of voltage drop VW1 and the second wire W2 of the first wire W1.
It follows that when detection output electric current Iout detected by resistance Rdet (namely is supplied to outside negative
Carry 900 load current) increase time, set electric current Iset current value increase the most in certain proportion (according to
Formula (1), (2)) so that the magnitude of voltage compensating voltage Vcmp is consequently increased to carry out output voltage VO
Compensate.Consequently, it is possible to the output voltage VO after Bu Changing ' can make load voltage VL not by the first wire
The impact of the voltage drop VW2 of the voltage drop VW1 and the second wire W2 of W1 be (i.e. output electric current Iout's
Impact) and maintain stable magnitude of voltage.
Being different from an one exemplary embodiment, Fig. 2 is the tool electric wire pressure drop shown in another embodiment of the present invention
The schematic diagram of the power supply device 200 compensated.Please merge with reference to Fig. 1 and Fig. 2, the electricity shown in Fig. 2
Source supply device 200 includes that the first power pin P1, second source pin P2, direct current export voltage stabilizing equally
Device 110, current sensing circuit 120 and compensation circuit 130 '.Direct current output voltage stabilizer shown in Fig. 2
110, the circuit framework of current sensing circuit 120 and compensation circuit 130 ' is analogous respectively to shown in Fig. 1
Direct current output voltage stabilizer 110, current sensing circuit 120 and the circuit framework of compensation circuit 130, therefore
Refer to the related description of above-mentioned Fig. 1 to analogize, do not repeat them here.
It is coupled to the output electricity at direct current output voltage stabilizer 110 compared to the circuit 130 that compensates shown in Fig. 1
Between reference voltage end VSS of pressure side OUT and direct current output voltage stabilizer 110, the compensation shown in Fig. 2
Circuit 130 ' is coupled between the first power pin P1 and second source pin P2.In other words, figure
The produced voltage Vcmp that compensates of compensation circuit 130 of 1 is that direct compensation is at direct current output voltage stabilizer 110
On produced DC voltage Vdc, thus indirectly output voltage VO is compensated (such as formula (7) institute
Show).Relatively, the produced voltage Vcmp that compensates of the compensation circuit 130 ' of Fig. 2 is then directly to defeated
Go out voltage VO to compensate.
Running below for the power supply device 200 shown in Fig. 2 illustrates.Say for convenience
Bright, below in an example, it is also assumed that the first resistance Ra in subtractor 121, the second resistance
Rb, the 3rd resistance Rc and the 4th resistance Rd resistance value the most identical, and the first of bleeder circuit 135
The resistance value of resistance R1 and the second resistance R2 is greatly in the resistance value of setting resistance Rset, therefore flows into dividing potential drop
The electric current Ifb of circuit 135 is negligible, but the present invention is not limited thereto.In the case, electric current
Sensing circuit 120 produced sensing voltage Vsen is by voltage difference Vd equal to detection resistance Rdet two ends.
It addition, negative feedback characteristic based on voltage follower 131_1, therefore setting voltage Vset is substantially equal to sense
Survey voltage Vsen.Therefore setting electric current Iset can be as shown in formula (1), and setting voltage Vset can be such as formula (2) institute
Show, and compensate voltage Vcmp can be as shown in formula (3).
When external loading 900 not power consumption, namely when output electric current Iout is zero, detect resistance Rdet
Voltage difference Vd at two ends is zero so that setting voltage Vset is zero, therefore sets electric current Iset as zero.This
Time, compensate and compensation voltage Vcmp on resistance R3, will not be produced.In addition, the first wire W1
The voltage drop VW2 of voltage drop VW1 and the second wire W2 is zero (because output electric current Iout is zero),
Therefore, load voltage VL will be also equal to direct current output voltage stabilizer 110 produced equal to output voltage VO
DC voltage Vdc, as shown in formula (5).In other words, now direct current output voltage stabilizer 110 is produced
DC voltage Vdc be i.e. output voltage VO and load voltage VL.
Relatively, when external loading 900 because of come into operation and during power consumption, namely output electric current Iout
During more than zero, according to formula (4), compensate and will produce, on resistance R3, the compensation voltage Vcmp being not zero.This
Time, the output voltage VO after compensation ' then as shown in formula (13).
VO '=(1+ ((R1+R3) ÷ R2)) × Vfb+Vcmp formula (13)
In addition, the voltage drop VW1 and the voltage drop VW2 of the second wire W2 of the first wire W1
Can be respectively as shown in formula (8) and formula (9).In order to allow load voltage VL can keep stable, namely no matter export
How the size of current of electric current Iout changes, and load voltage VL can be stable at
((1+ ((R1+R3) ÷ R2)) × Vfb) (i.e. output electric current Iout is the magnitude of voltage of load voltage VL when zero),
Therefore formula (10) can be set up.Formula (13) is substituted into the available formula (14) of formula (10).Formula (4), (8), (9) are substituted into
Formula (14) can get formula (15).
Vcmp=VW1+VW2 formula (14)
((Rdet × R3) ÷ Rset)=RW1+RW2 formula (15)
As long as it follows that by the resistance RW1 and the electricity of the second wire W2 that measure the first wire W1
The resistance value of resistance RW2, and by adjusting detection resistance Rdet, compensating resistance R3 and set resistance
The resistance value of Rset, to meet the condition of formula (15), can produce corresponding compensation voltage Vcmp with to defeated
Go out voltage VO to compensate, so that load voltage VL keeps stable.At this it is noted that
Owing to voltage difference Vd at the two ends of detection resistance Rdet is the least, therefore voltage difference Vd in formula (7) is led to
The most negligible.Therefore the DC voltage Vdc ' after compensating substantially can be considered the output voltage after compensation
VO’。
For example, in the above-described embodiments, it is assumed that direct current output voltage stabilizer 110 may be used to produce 5 volts
Special DC voltage Vdc, the resistance value of the resistance RW1 of the first wire W1 is 0.2 ohm (Ω), and the
The resistance value of the resistance RW2 of two wire W2 is 0.2 ohm.In order to meet formula (15), detect resistance Rdet
Resistance value can be 0.01 ohm, set resistance Rset resistance value can be 2.5 kilohms (K Ω), and mend
The resistance value repaying resistance R3 can be 100 kilohms, but is not limited to this.
When external loading 900 not power consumption, namely output electric current Iout is 0 ampere-hour, detection electricity
Voltage difference Vd at resistance Rdet two ends is 0 volt, therefore sets electric current Iset as 0 ampere.Now, compensate
Compensation voltage Vcmp will not be produced on resistance R3.In addition, the voltage drop of the first wire W1
The voltage drop VW2 of VW1 and the second wire W2 is 0 volt, and therefore, load voltage VL is equal to
Output voltage VO, that is to say DC voltage Vdc produced by direct current output voltage stabilizer 110 (being 5 volts).
On the other hand, when external loading 900 because of come into operation and during power consumption, it is assumed herein that output electricity
Stream Iout is 1 ampere, then the voltage drop VW1 of the first wire W1 and the voltage drop of the second wire W2
VW2 is 0.2 volt, and detects voltage difference Vd at resistance Rdet two ends, sensing voltage Vsen and set
Determine voltage Vset and be all 0.01 volt.Consequently, it is possible to transistor Q will be switched on and set electric current Iset
It it is 0.004 milliampere.Now, compensating will be because setting electric current Iset (being 0.004 milliampere) on resistance R3
Flowing through and producing compensation voltage Vcmp is 0.4 volt.Now, output voltage VO is because compensating voltage Vcmp
It is 0.4 volt and is drawn high (or being compensated) to 5.4 volts.Output voltage VO after compensation ' at deduction the
The feelings of the voltage drop VW2 (being all 0.2 volt) of the voltage drop VW1 and the second wire W2 of one wire W1
Under condition, load voltage VL is still 5 volts.
It follows that when detection output electric current Iout detected by resistance Rdet (namely is supplied to outside negative
Carry 900 load current) increase time, set electric current Iset current value increase the most in certain proportion (according to
Formula (1), (2)) so that the magnitude of voltage compensating voltage Vcmp is consequently increased to carry out output voltage VO
Compensate.Consequently, it is possible to the output voltage VO after Bu Changing ' can make load voltage VL not by the first wire
The impact of the voltage drop VW2 of the voltage drop VW1 and the second wire W2 of W1 be (i.e. output electric current Iout's
Impact) and maintain stable magnitude of voltage.
Being different from the embodiment shown in Fig. 1, Fig. 3 is the tool electric wire pressure drop shown in further embodiment of this invention
The schematic diagram of the power supply device 300 compensated.Please merge with reference to Fig. 1 and Fig. 3, the electricity shown in Fig. 3
Source supply device 300 includes that the first power pin P1, second source pin P2, direct current export voltage stabilizing equally
Device 110, current sensing circuit 120 ' and compensation circuit 130, and current sensing circuit 120 ' includes equally
Detection resistance Rdet and subtractor 121 '.Direct current output voltage stabilizer 110 shown in Fig. 3, current sense
The circuit framework class respectively of circuit 120 ', detection resistance Rdet, subtractor 121 ' and compensation circuit 130
It is similar to the direct current output voltage stabilizer 110 shown in Fig. 1, current sensing circuit 120, detection resistance Rdet, subtracts
Musical instruments used in a Buddhist or Taoist mass 121 and the circuit framework of compensation circuit 130, therefore refer to the related description of above-mentioned Fig. 1 with class
Push away, do not repeat them here.
The difference of the power supply device 100 shown in Fig. 1 and the power supply device 300 shown in Fig. 3 is only
It is: the current sensing circuit 120 shown in Fig. 1 is coupled to the output electricity at direct current output voltage stabilizer 110
Voltage is sensed with sensing output electric current Iout generation according to this between pressure side OUT and the first power pin P1
Vsen, and reference voltage end VSS of direct current output voltage stabilizer 110 is coupled to second source pin P2.
Current sensing circuit 120 ' shown in Fig. 3 is then coupled to the reference voltage at direct current output voltage stabilizer 110
Voltage is sensed with sensing output electric current Iout generation according to this between end VSS and second source pin P2
Vsen, and the output voltage terminal OUT of direct current output voltage stabilizer 110 is then coupled to the first power pin
P1.But, the running of the power supply device 300 shown in Fig. 3 and the power supply device shown in Fig. 1
The running of 100 is similar.Therefore, the running of the power supply device 300 shown in Fig. 3 refers to
State the related description of Fig. 1 to analogize, therefore do not repeat them here.
Hereinafter refer to the electricity that Fig. 4, Fig. 4 are the tool electric wire voltage-drop compensations shown in further embodiment of this invention
The schematic diagram of source supply device 400.Please merge with reference to Fig. 2 and Fig. 4, the power supply supply dress shown in Fig. 4
Put 400 include equally the first power pin P1, second source pin P2, direct current output voltage stabilizer 110,
Current sensing circuit 120 ' and compensation circuit 130 '.Direct current output voltage stabilizer 110 shown in Fig. 4, electricity
It is defeated that the circuit framework of influenza slowdown monitoring circuit 120 ' and compensation circuit 130 ' is analogous respectively to the direct current shown in Fig. 2
Go out manostat 110, current sensing circuit 120 and compensate the circuit framework of circuit 130 ', therefore referring to
The related description of above-mentioned Fig. 1, to analogize, does not repeats them here.
The difference of the power supply device 200 shown in Fig. 2 and the power supply device 400 shown in Fig. 4 is only
It is: the current sensing circuit 120 shown in Fig. 2 is coupled to the output electricity at direct current output voltage stabilizer 110
Voltage is sensed with sensing output electric current Iout generation according to this between pressure side OUT and the first power pin P1
Vsen, and reference voltage end VSS of direct current output voltage stabilizer 110 is coupled to second source pin P2.
Current sensing circuit 120 ' shown in Fig. 4 is then coupled to the reference voltage at direct current output voltage stabilizer 110
Voltage is sensed with sensing output electric current Iout generation according to this between end VSS and second source pin P2
Vsen, and the output voltage terminal OUT of direct current output voltage stabilizer 110 is then coupled to the first power pin
P1.But, the running of the power supply device 400 shown in Fig. 4 and the power supply device shown in Fig. 2
The running of 200 is similar.Therefore, the running of the power supply device 400 shown in Fig. 4 refers to
State the related description of Fig. 2 to analogize, therefore do not repeat them here.
In sum, in the above embodiment of the present invention, output electricity can be detected by current sensor
Stream (namely being supplied to the load current of external loading).When the output current increases, the setting in circuit is compensated
The current value of electric current increases the most in certain proportion so that compensate the produced voltage compensating voltage of circuit
Value is consequently increased.Even if consequently, it is possible to output electric current changes the voltage drop and second making the first wire
The voltage drop of wire changes therewith, compensates circuit and still can produce correspondingly sized compensation voltage with to output electricity
Pressure compensates, so that load voltage maintains stable magnitude of voltage.Therefore, electricity can effectively be promoted
Source supply device when high capacity, the degree of stability of the load voltage of external loading, and can improve load end because of
The problem that momentary load sharply increases and causes load voltage moment to decline.In addition, the present invention is above-mentioned
The power supply device of embodiment need not to use extra detection wire to detect load terminal voltage, therefore can
Increase the trustworthiness of the wire of power supply device and reduce cost and the size of wire.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, rather than right
It limits；Although the present invention being described in detail with reference to foregoing embodiments, this area common
Skilled artisans appreciate that the technical scheme described in foregoing embodiments still can be modified by it,
Or the most some or all of technical characteristic is carried out equivalent；And these amendments or replacement, and
The essence not making appropriate technical solution departs from the scope of various embodiments of the present invention technical scheme.
Claims (13)
1. have a power supply device for electric wire voltage-drop compensation, in order to supply power to external loading, its feature
Being, described power supply device includes:
First power pin, in order to be couple to the first power supply contact of described external loading by the first wire；
Second source pin, in order to be couple to the second source contact of described external loading by the second wire；
Direct current output voltage stabilizer, in order to receive input voltage and feedback voltage, and produces output voltage according to this
With output electric current；
Current sensing circuit, is coupled in the output voltage terminal of described direct current output voltage stabilizer and described first electricity
To sense described output electric current between the pin of source, or it is coupled in the reference electricity of described direct current output voltage stabilizer
To sense described output electric current between pressure side and described second source pin, and produce sensing voltage according to this；
And
Compensate circuit, be couple to described current sensing circuit to receive described sensing voltage, and be coupled in institute
State between the first power pin and described second source pin or be coupled in described direct current output voltage stabilizer
Between the described reference voltage end of described output voltage terminal and described direct current output voltage stabilizer with produce described instead
Feedthrough voltage, wherein said compensation circuit reacts on described sensing voltage and compensates voltage to produce, and uses
Described output voltage is compensated by described compensation voltage, and wherein said compensation voltage is described first wire
The voltage drop sum of voltage drop and described second wire.
The power supply device of tool electric wire voltage-drop compensation the most according to claim 1, it is characterised in that
Described current sensing circuit is coupled in the described output voltage terminal and described first of described direct current output voltage stabilizer
Between power pin, and the described reference voltage end of described direct current output voltage stabilizer is couple to described second electricity
Source pin, described current sensing circuit includes:
Detection resistance, is coupled in the described output voltage terminal of described direct current output voltage stabilizer and described first electricity
Between the pin of source, in order to detect described output electric current；And
Subtractor, is couple to the two ends electricity with the described two ends to described detection resistance of described detection resistance
Pressure carries out subtraction, and produces described sensing voltage according to this.
The power supply device of tool electric wire voltage-drop compensation the most according to claim 2, it is characterised in that
Described subtractor includes:
Operational amplifier, the outfan of described operational amplifier is in order to produce described sensing voltage；
First resistance, the described output voltage terminal being coupled in described direct current output voltage stabilizer is put with described computing
Between the non-inverting input of big device；
Second resistance, is coupled in the described non-inverting input of described operational amplifier and described second source
Between pin；
3rd resistance, be coupled in described first power pin and described operational amplifier inverting input it
Between；And
4th resistance, is coupled in the described inverting input of described operational amplifier and described operational amplifier
Outfan between.
The power supply device of tool electric wire voltage-drop compensation the most according to claim 1, it is characterised in that
Described compensation circuit is coupled in the described output voltage terminal of described direct current output voltage stabilizer and exports with described direct current
Between the described reference voltage end of manostat, described compensation circuit includes:
Voltage-to-current converter, the input of described voltage-to-current converter is couple to described electric current sense
Slowdown monitoring circuit is to receive described sensing voltage, and produces setting electric current according to this；
Compensate resistance, be coupled in the described output voltage terminal of described direct current output voltage stabilizer with described voltage extremely
Between the outfan of current converter, produce described compensation voltage in order to react on described setting electric current；
And
Bleeder circuit, the described outfan being coupled in described voltage-to-current converter exports with described direct current
Between the described reference voltage end of manostat, produce described feedback electricity in order to react on described compensation voltage
Pressure.
The power supply device of tool electric wire voltage-drop compensation the most according to claim 4, it is characterised in that
Described voltage-to-current converter includes:
Voltage follower, the first input end of described voltage follower is in order to receive described sensing voltage to make
For setting voltage, the outfan of described voltage follower is couple to the described of described voltage-to-current converter
Outfan；And
Set resistance, be coupled in the second input of described voltage follower and described direct current output voltage stabilizer
Described reference voltage end between, in order to react on described setting voltage to produce described setting electric current.
The power supply device of tool electric wire voltage-drop compensation the most according to claim 5, it is characterised in that
Described voltage follower includes:
Operational amplifier, the non-inverting input of described operational amplifier is couple to described voltage follower
Described first input end, the inverting input of described operational amplifier is couple to the institute of described voltage follower
State the second input；And
Transistor, the end that controls of described transistor is couple to the outfan of described operational amplifier, described crystalline substance
First end of body pipe is couple to the described outfan of described voltage follower, the second end coupling of described transistor
Receive the inverting input of described operational amplifier.
The power supply device of tool electric wire voltage-drop compensation the most according to claim 4, it is characterised in that
Described bleeder circuit includes:
First resistance, the described outfan being coupled in described voltage-to-current converter exports with described direct current
Between one feedback end of manostat；And
Second resistance, the described feedback end being coupled in described direct current output voltage stabilizer is steady with the output of described direct current
Between the described reference voltage end of depressor.
The power supply device of tool electric wire voltage-drop compensation the most according to claim 1, it is characterised in that
Described compensation circuit is coupled between described first power pin and described second source pin, described compensation
Circuit includes:
Voltage-to-current converter, the input of described voltage-to-current converter is couple to described electric current sense
Slowdown monitoring circuit is to receive described sensing voltage, and produces setting electric current according to this；
Compensate resistance, be coupled in the outfan of described first power pin and described voltage-to-current converter
Between, produce described compensation voltage in order to react on described setting electric current；And
Bleeder circuit, is coupled in the described outfan of described voltage-to-current converter and described second source
Between pin, produce described feedback voltage in order to react on described compensation voltage.
The power supply device of tool electric wire voltage-drop compensation the most according to claim 8, it is characterised in that
Described voltage-to-current converter includes:
Voltage follower, the first input end of described voltage follower is in order to receive described sensing voltage to make
For setting voltage, the outfan of described voltage follower is couple to the described of described voltage-to-current converter
Outfan；And
Set resistance, be coupled in the second input of described voltage follower and described second source pin it
Between, in order to react on described setting voltage to produce described setting electric current.
The power supply device of tool electric wire voltage-drop compensation the most according to claim 9, its feature exists
In, described voltage follower includes:
Operational amplifier, the non-inverting input of described operational amplifier is couple to described voltage follower
Described first input end, the inverting input of described operational amplifier is couple to the institute of described voltage follower
State the second input；And
Transistor, the end that controls of described transistor is couple to the outfan of described operational amplifier, described crystalline substance
First end of body pipe is couple to the described outfan of described voltage follower, the second end coupling of described transistor
Receive the described inverting input of described operational amplifier.
The power supply device of 11. tool electric wire voltage-drop compensations according to claim 8, its feature exists
In, described bleeder circuit includes:
First resistance, the described outfan being coupled in described voltage-to-current converter exports with described direct current
Between the feedback end of manostat；And
Second resistance, the described feedback end being coupled in described direct current output voltage stabilizer connects with described second source
Between foot.
The power supply device of 12. tool electric wire voltage-drop compensations according to claim 1, its feature exists
In, described current sensing circuit is coupled in the described reference voltage end of described direct current output voltage stabilizer with described
Between second source pin, and the described output voltage terminal of described direct current output voltage stabilizer is couple to described
One power pin, described current sensing circuit includes:
Detection resistance, is coupled in the described reference voltage end of described direct current output voltage stabilizer and described second electricity
Between the pin of source, in order to detect described output electric current；And
Subtractor, is couple to the two ends electricity with the described two ends to described detection resistance of described detection resistance
Pressure carries out subtraction, and produces described sensing voltage according to this.
The power supply device of 13. tool electric wire voltage-drop compensations according to claim 12, its feature exists
In, described subtractor includes:
Operational amplifier, the outfan of described operational amplifier is in order to produce described sensing voltage；
First resistance, is coupled in the non-inverting input of described second source pin and described operational amplifier
Between；
Second resistance, the described non-inverting input being coupled in described operational amplifier exports with described direct current
Between the described reference voltage end of manostat；
3rd resistance, the described reference voltage end being coupled in described direct current output voltage stabilizer is put with described computing
Between the inverting input of big device；And
4th resistance, is coupled in the described inverting input of described operational amplifier and described operational amplifier
Outfan between.
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| CN109951075A (en) * | 2019-03-11 | 2019-06-28 | 深圳市核达中远通电源技术股份有限公司 | Load regulation control circuit of switching power supply and implementation method thereof |
| 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 |
| CN111813174A (en) * | 2020-07-20 | 2020-10-23 | 无锡英诺浦斯微电子有限公司 | Control device and regulation method for output voltage of synchronous rectification chip changing along with current |
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