CN103872912A - Linear power supply - Google Patents

Linear power supply Download PDF

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Publication number
CN103872912A
CN103872912A CN201210539690.9A CN201210539690A CN103872912A CN 103872912 A CN103872912 A CN 103872912A CN 201210539690 A CN201210539690 A CN 201210539690A CN 103872912 A CN103872912 A CN 103872912A
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resistance
connects
power supply
linear power
sampling resistor
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CN103872912B (en
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李凯
王悦
王铁军
李维森
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Rigol Technologies Inc
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Rigol Technologies Inc
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Abstract

The invention provides a linear power supply characterized by comprising a commercial power port, a transformer, a rectifier bridge, a capacitor, a triode, a diode, an error amplifier, a sampling resistor, a difference amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; the invention also provides another linear power supply comprising a commercial power port, a transformer, a rectifier bridge, a capacitor, a triode, a diode, an error amplifier, a sampling resistor, a noninverting amplifier, a first resistor, a second resistor, a fifth resistor and a six resistor. Two ends of the sampling resistor are regarded as sampling points so as to obtain voltage, the obtained voltage is inputted to the difference amplifier or the noninverting amplifier; because one end of the sampling resistor and an inner reference point of the linear power supply are not the sampling points, so error resistance formed by a wire resistor and a terminal contact resistor can be shielded, thereby accurately controlling the current passing the sampling resistor, so the output current of the linear power supply can be more accurate.

Description

A kind of linear power supply
Technical field
The present invention relates to power technique fields, particularly, relate to a kind of linear power supply.
Background technology
Laboratory power supply is many based on linear principle at present, be illustrated in figure 1 the circuit structure diagram of typical linear power supply, wherein, V1 is civil power port (containing transformer), BD1 is rectifier bridge, C1 is electric capacity, Q1 is the linear pipe of adjusting, Rs is sampling resistor, Vcc_ref is constant current reference voltage, Vcv_ref is constant voltage reference voltage, RL is load, Vout+ is the voltage of forward output, Vout-is the voltage of negative sense output, this circuit is ground AGEND taking forward output as internal reference, constant current control loop and constant voltage control loop are connected to the linear base stage of adjusting pipe Q1 by the AND circuit of diode D1 and D2 composition, and constant current control loop and constant voltage control loop are shared forward output and negative sense output,
In Fig. 1, civil power port V1, rectifier bridge BD1 and capacitor C 1 have formed current rectifying and wave filtering circuit, and if Fig. 2 is the equivalent circuit diagram of circuit as shown in Fig. 1, in Fig. 1, civil power port V1, rectifier bridge BD1 and capacitor C 1 are equivalent to the current rectifying and wave filtering circuit V2 in Fig. 2;
Fig. 3 is the concrete schematic diagram of constant current control loop in circuit shown in Fig. 2, and wherein, constant-current error amplifier is according to current source reference voltage Vcc_ref and sampled voltage V imon(V imonfor the voltage that one end of sampling resistor Rs is recorded) remove to control the linear pipe Q1 that adjusts, make the linear electric current I out that adjusts pipe Q1 output constant size; Ideally,
Figure BDA00002581065100011
but because this Circuits System is ground AGEND, i.e. sampled voltage V taking forward output as internal reference imonequal the voltage difference between one end and the forward output of sampling resistor Rs, and have conductor resistance and termination contact resistance from sampling resistor Rs to forward output, these resistance have formed error resistance R e, cause actual output current to be
Figure BDA00002581065100012
therefore between actual output current and desirable output current, there is error, make laboratory power supply that reliable constant current can not be provided, reduced the accurate performance of linear power supply.
Summary of the invention
The main purpose of the embodiment of the present invention is to provide a kind of linear power supply, to solve existing linear power supply because existing conductor resistance and termination contact resistance can not accurately control the defect of output current.
To achieve these goals, the embodiment of the present invention provides a kind of linear power supply, comprising: civil power port, transformer, rectifier bridge, electric capacity, triode, diode, error amplifier, sampling resistor, differential amplifier, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance and the 6th resistance; Wherein,
The primary coil of described transformer connects described civil power port, and secondary coil connects two ac input ends of described rectifier bridge;
Two direct-flow input ends of described rectifier bridge connect described electric capacity;
The positive electrode of described electric capacity connects the collector electrode of described triode, and negative electrode connects the negative sense output of this linear power supply;
The base stage of described triode connects the anode of described diode;
One end of described sampling resistor connects the emitter of described triode, and the other end connects the forward output of this linear power supply;
The negative electrode of described diode connects the output of described error amplifier;
The in-phase input end ground connection of described error amplifier;
One end input constant current reference voltage of described the first resistance, the other end connects the reverse input end of described error amplifier;
One end of described the second resistance connects the reverse input end of described error amplifier, and the other end connects the output of described differential amplifier;
One end ground connection of described the 3rd resistance, the other end connects the in-phase input end of described differential amplifier;
One end of described the 4th resistance connects the in-phase input end of described differential amplifier, and the other end connects one end of described sampling resistor;
One end of described the 5th resistance connects the inverting input of described differential amplifier, and the other end connects the other end of described sampling resistor;
One end of described the 6th resistance connects the inverting input of described differential amplifier, and the other end connects the output of described differential amplifier;
Described the 3rd resistance equates with the resistance of the 6th resistance, and described the 4th resistance equates with the resistance of the 5th resistance;
This linear power supply can be determined and control output current according to described constant current reference voltage, sampling resistor, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance.
Preferably, described linear power supply can be determined and control output current according to following formula:
I out = - R 2 R 1 × R 5 R 6 × V cc _ ref R s ; Or,
I out = - R 2 R 1 × R 4 R 3 × V cc _ ref R s ;
Wherein, I outfor the output current of this linear power supply; V cc_reffor constant current reference voltage; R sfor the resistance of sampling resistor; R 1it is the resistance of the first resistance; R 2it is the resistance of the second resistance; R 3it is the resistance of the 3rd resistance; R 4it is the resistance of the 4th resistance; R 5it is the resistance of the 5th resistance; R 6it is the resistance of the 6th resistance.
Preferably, described sampling resistor is patch-type resistance or direct plugging-in resistance.
Preferably, one end linking number weighted-voltage D/A converter of described the first resistance, described constant current reference voltage is provided by described digital to analog converter.
Preferably, the Standard resistance range of described the 4th resistance and the 5th resistance is 1k Ω ~ 10k Ω, and the Standard resistance range of described the first resistance and the second resistance is 1k Ω ~ 100k Ω.
A kind of linear power supply, comprising: civil power port, transformer, rectifier bridge, electric capacity, triode, diode, error amplifier, sampling resistor, in-phase amplifier, the first resistance, the second resistance, the 5th resistance and the 6th resistance; Wherein,
The primary coil of described transformer connects described civil power port, and secondary coil connects two ac input ends of described rectifier bridge;
Two direct-flow input ends of described rectifier bridge connect described electric capacity;
The positive electrode of described electric capacity connects the collector electrode of described triode, and negative electrode connects power-to output;
The base stage of described triode connects the anode of described diode;
One end of described sampling resistor connects the emitter of described triode, and the other end connects power supply forward output;
The negative electrode of described diode connects the output of described error amplifier;
The in-phase input end ground connection of described error amplifier;
One end input constant current reference voltage of described the first resistance, the other end connects the reverse input end of described error amplifier;
One end of described the second resistance connects the reverse input end of described error amplifier, and the other end connects the output of described in-phase amplifier;
The in-phase input end of described in-phase amplifier connects one end of described sampling resistor;
One end of described the 5th resistance connects the inverting input of described in-phase amplifier, and the other end connects the other end of described sampling resistor;
One end of described the 6th resistance connects the inverting input of described in-phase amplifier, and the other end connects the output of described in-phase amplifier;
This linear power supply can be determined and control output current according to described constant current reference voltage, sampling resistor, the first resistance, the second resistance, the 5th resistance, the 6th resistance.
Preferably, described linear power supply can be determined and control output current according to following formula:
I out = - R 2 R 1 × ( R 5 R 6 + 1 ) × V cc _ ref R s ;
Wherein, I outfor the output current of this linear power supply; V cc_reffor constant current reference voltage; R sfor the resistance of sampling resistor; R 1it is the resistance of the first resistance; R 2it is the resistance of the second resistance; R 5it is the resistance of the 5th resistance; R 6it is the resistance of the 6th resistance.
Preferably, described sampling resistor is patch-type resistance or direct plugging-in resistance.
Preferably, one end linking number weighted-voltage D/A converter of described the first resistance, described constant current reference voltage is provided by described digital to analog converter.
Preferably, the Standard resistance range of described the 5th resistance is 1k Ω ~ 10k Ω, and the Standard resistance range of described the first resistance and the second resistance is 1k Ω ~ 100k Ω.
By means of technique scheme, the present invention obtains voltage using the two ends of sampling resistor as sampled point, the voltage obtaining is inputed to differential amplifier or in-phase amplifier, due to be not using one end of sampling resistor and the internal reference of linear power supply as sampled point, therefore the error resistance that maskable conductor resistance and termination contact resistance form, accurately determine by the size of current of sampling resistor, and then go to control the output of triode according to constant current reference voltage, make the output current of linear power supply more accurate.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit diagram schematic diagram of the existing typical linear power supply that provides of background technology of the present invention;
Fig. 2 is the equivalent circuit diagram of linear power supply circuit shown in Fig. 1 of providing of background technology of the present invention;
Fig. 3 is the circuit diagram of the constant current control loop that provides of background technology of the present invention;
Fig. 4 is the linear power supply circuit diagram that the present embodiment one provides;
Fig. 5 is the schematic diagram of integer filter circuit in the linear power supply that provides of the present embodiment one;
Fig. 6 is the linear power supply circuit diagram that the present embodiment two provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
In view of existing linear power supply is because existing conductor resistance and termination contact resistance can not accurately control the defect of output current, the embodiment of the present invention provides a kind of precision linear power supply, in order to realize the object of accurate control output current.Below in conjunction with accompanying drawing, the present invention is described in detail.
Embodiment mono-
The present embodiment provides a kind of linear power supply, as shown in Figure 4, this linear power supply comprises: current rectifying and wave filtering circuit S, triode Q1, diode D1, error amplifier, sampling resistor Rs, differential amplifier, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5 and the 6th resistance R 6;
The positive output end of described current rectifying and wave filtering circuit S connects the collector electrode of described triode, and negative output terminal connects the negative sense output of this linear power supply;
The base stage of described triode Q1 connects the positive pole of described diode D1;
One end of described sampling resistor Rs connects the emitter of described triode Q1, and the other end connects the forward output of this linear power supply;
The negative pole of described diode D1 connects the output of described error amplifier;
The in-phase input end ground connection of described error amplifier;
One end input constant current reference voltage of described the first resistance R 1, the other end connects the reverse input end of described error amplifier;
One end of described the second resistance R 2 connects the reverse input end of described error amplifier, and the other end connects the output of described differential amplifier;
One end ground connection of described the 3rd resistance R 3, the other end connects the in-phase input end of described differential amplifier;
One end of described the 4th resistance R 4 connects the in-phase input end of described differential amplifier, and the other end connects one end of described sampling resistor Rs;
One end of described the 5th resistance R 5 connects the inverting input of described differential amplifier, and the other end connects the other end of described sampling resistor Rs;
One end of described the 6th resistance R 6 connects the inverting input of described differential amplifier, and the other end connects the output of described differential amplifier;
Described the 3rd resistance R 3 equates with the resistance of the 6th resistance R 6, and described the 4th resistance R 4 equates with the resistance of the 5th resistance R 5;
Wherein, the particular circuit configurations of current rectifying and wave filtering circuit S as shown in Figure 5, is made up of civil power port, transformer, rectifier bridge and electric capacity;
The primary coil of described transformer connects described civil power port, and secondary coil connects two ac input ends of described rectifier bridge;
Two direct-flow input ends of described rectifier bridge connect described electric capacity;
The positive electrode of described electric capacity connects the positive output end of this current rectifying and wave filtering circuit S, and negative electrode connects the negative output terminal of this current rectifying and wave filtering circuit S.
The linear power supply that the present embodiment provides can be determined and control output current according to described constant current reference voltage, sampling resistor Rs, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6;
According to circuit structure as shown in Figure 4, can determine following formula:
R 3=R 6; R 4=R 5(formula 1)
V Im on = I out × R s × R 6 R 5 (formula 2)
V Im on = I out × R s × ( R 3 ) ( R 4 ) (formula 3)
V cc _ ref R 1 = - V Im on R 2 (formula 4)
According to above-mentioned four formula, can extrapolate following formula:
I out = - R 2 R 1 × R 5 R 6 × V cc _ ref R s (formula 5)
I out = - R 2 R 1 × R 4 R 3 × V cc _ ref R s (formula 6)
Wherein, V imonfor the voltage of differential amplifier output; I outfor the output current of this linear power supply; R sfor the resistance of sampling resistor Rs; R 6it is the resistance of the 6th resistance R 6; R 5it is the resistance of the 5th resistance R 5; R 3it is the resistance of the 3rd resistance R 3; R 4it is the resistance of the 4th resistance R 4; V cc_reffor constant current reference voltage; R 1it is the resistance of the first resistance R 1; R 2it is the resistance of the second resistance R 2.
Accordingly, the present embodiment also can be determined the proportionate relationship between each resistance in circuit according to the multiplication factor of the output-current rating of linear power supply, constant current reference voltage, sampling resistor Rs, differential amplifier, for example:
Requiring the output-current rating of linear power supply is 1A, and in circuit, known constant current reference voltage is 5V, and the resistance of sampling resistor Rs is 0.5 Ω, and the multiplication factor of differential amplifier is 10 times, has following formula relation:
I out=1A；
V cc_ref=5V；
R s=0.5Ω；
R 3/R 4=10；
R 6/R 5=10；
If making the resistance of the 4th resistance R 4 and the 5th resistance R 5 in linear power supply is 1k Ω, i.e. R 4=R 5=1k Ω, has R 3=R 6=10k Ω, the resistance of the 3rd resistance R 3 and the 6th resistance R 6 is 10k Ω;
Can obtain V according to above-mentioned formula 2 or formula 3 imon=5V; Can obtain R according to above-mentioned formula 4 1/ R 2=1; Therefore, can make the resistance of the first resistance R 1 and the second resistance R 2 in linear power supply is all 10k Ω, can meet R 1/ R 2=1;
Thus, finally determine that the resistance of each resistance is R in this linear power supply 1=R 2=10k Ω, R 4=R 5=1k Ω, R 3=R 6=10k Ω.
In concrete enforcement, the sampling resistor Rs in the present embodiment can patch-type resistance, can be also direct plugging-in resistance.
In concrete enforcement, the reference voltage that constant current reference voltage can provide for external number weighted-voltage D/A converter DAC, can be also a reference voltage directly being introduced this linear power supply by outside; In the time that constant current reference voltage is provided by digital to analog converter DAC, one end linking number weighted-voltage D/A converter DAC of described the first resistance R 1.
In concrete enforcement, if the resistance of the 4th resistance R 4 and the 5th resistance R 5 is excessive, can cause differential amplifier to produce larger bias voltage, if and the resistance of the 4th resistance R 4 and the 5th resistance R 5 is too small, the proportionality coefficient of the error effect differential amplifier that will produce because of conductor resistance, preferably, the Standard resistance range of described the 4th resistance R 4 and the 5th resistance R 5 is 1k Ω ~ 10k Ω; If the resistance of the first resistance R 1 and the second resistance R 2 is excessive, can cause differential amplifier output voltage to occur relatively large deviation, if and the resistance of the first resistance R 1 and the second resistance R 2 is too small, the proportionality coefficient of the error effect differential amplifier that will produce because of conductor resistance, preferably, the Standard resistance range of described the first resistance R 1 and the second resistance R 2 is 1k Ω ~ 100k Ω.
In the linear power supply that the present embodiment provides, two ends using sampling resistor Rs obtain voltage as sampled point, the voltage obtaining is inputed to differential amplifier, due to be not using one end of sampling resistor Rs and the internal reference of linear power supply as sampled point, therefore the error resistance that maskable conductor resistance and termination contact resistance form, accurately determine by the size of current of sampling resistor Rs, and then go to control the output of triode Q1 according to constant current reference voltage, make the output current of linear power supply more accurate; The linear power supply that the present embodiment provides can be for measuring micro-resistance, measure the internal resistance of cell, measuring resistance type transducer provides reliable constant-current source.
Embodiment bis-
The present embodiment provides another kind of linear power supply, as shown in Figure 6, this linear power supply comprises: current rectifying and wave filtering circuit S, triode Q1, diode D1, error amplifier, sampling resistor Rs, in-phase amplifier, the first resistance R 1, the second resistance R 2, the 5th resistance R 5 and the 6th resistance R 6;
The positive output end of described current rectifying and wave filtering circuit S connects the collector electrode of described triode, and negative output terminal connects the negative sense output of this linear power supply;
The base stage of described triode Q1 connects the positive pole of described diode D1;
One end of described sampling resistor Rs connects the emitter of described triode Q1, and the other end connects power supply forward output;
The negative pole of described diode D1 connects the output of described error amplifier;
The in-phase input end ground connection of described error amplifier;
One end input constant current reference voltage of described the first resistance R 1, the other end connects the reverse input end of described error amplifier;
One end of described the second resistance R 2 connects the reverse input end of described error amplifier, and the other end connects the output of described in-phase amplifier;
The in-phase input end of described in-phase amplifier connects one end of described sampling resistor Rs;
One end of described the 5th resistance R 5 connects the inverting input of described in-phase amplifier, and the other end connects the other end of described sampling resistor Rs;
One end of described the 6th resistance R 6 connects the inverting input of described in-phase amplifier, and the other end connects the output of described in-phase amplifier;
Wherein, the particular circuit configurations of current rectifying and wave filtering circuit S as shown in Figure 5, is made up of civil power port, transformer, rectifier bridge and electric capacity;
The primary coil of described transformer connects described civil power port, and secondary coil connects two ac input ends of described rectifier bridge;
Two direct-flow input ends of described rectifier bridge connect described electric capacity;
The positive electrode of described electric capacity connects the positive output end of this current rectifying and wave filtering circuit S, and negative electrode connects the negative output terminal of this current rectifying and wave filtering circuit S.
The linear power supply that the present embodiment provides can be determined and control output current according to described constant current reference voltage, sampling resistor Rs, the first resistance R 1, the second resistance R 2, the 5th resistance R 5, the 6th resistance R 6.
According to the circuit structure shown in Fig. 6, can determine following formula:
V Im on = I out × R s × ( R 6 R 5 + 1 ) (formula 7)
V cc _ ref R 1 = - V Im on R 2 (formula 8)
According to above-mentioned two formula, can extrapolate following formula:
I out = - R 2 R 1 × ( R 5 R 6 + 1 ) × V cc _ ref R s (formula 9)
Wherein, V imonfor the voltage of differential amplifier output; I outfor the output current of this linear power supply; R sfor the resistance of sampling resistor RsRs; R 6it is the resistance of the 6th resistance R 6R6; R 5it is the resistance of the 5th resistance R 5R5; V cc_reffor constant current reference voltage; R 1it is the resistance of the first resistance R 1R1; R 2it is the resistance of the second resistance R 2R2.
Accordingly, the present embodiment also can be determined the proportionate relationship between each resistance in circuit according to the multiplication factor of the output-current rating of linear power supply, constant current reference voltage, sampling resistor Rs, differential amplifier, for example:
Requiring the output-current rating of linear power supply is 1A, and in circuit, known constant current reference voltage is 5V, and the resistance of sampling resistor Rs is 0.5 Ω, and the multiplication factor of in-phase amplifier is 11 times, has following formula relation:
I out=1A；
V cc_ref=5V；
R s=0.5Ω；
(R 6/R 5)+1=11；
If making the resistance of the 5th resistance R 5 in linear power supply is 1k Ω, i.e. R 5=1k Ω, has R 6=10k Ω, the resistance of the 6th resistance R 6 is 10k Ω;
Can obtain V according to above-mentioned formula 7 imon=5.5V; Can obtain R according to above-mentioned formula 8 1/ R 2=1:1.1; Therefore, the resistance that can make the first resistance R 1 in linear power supply is 10k Ω, and the resistance of the second resistance R 2 is 11k Ω, can meet R 1/ R 2=1:1.1;
Thus, finally determine that the resistance of each resistance is R in this linear power supply 1=10k Ω, R 2=11k Ω, R 5=1k Ω, R 6=10k Ω.
In concrete enforcement, the sampling resistor Rs in the present embodiment can patch-type resistance, can be also direct plugging-in resistance.
In concrete enforcement, the reference voltage that constant current reference voltage can provide for external number weighted-voltage D/A converter DAC, can be also a reference voltage directly being introduced this linear power supply by outside; In the time that constant current reference voltage is provided by digital to analog converter DAC, one end linking number weighted-voltage D/A converter DAC of described the first resistance R 1.
In concrete enforcement, if the resistance of the 5th resistance R 5 is excessive, can cause differential amplifier to produce larger bias voltage, if and the resistance of the 5th resistance R 5 is too small, the proportionality coefficient of the error effect differential amplifier that will produce because of conductor resistance, preferably, the Standard resistance range of described the 5th resistance R 5 is 1k Ω ~ 10k Ω; If the resistance of the first resistance R 1 and the second resistance R 2 is excessive, can cause differential amplifier output voltage to occur relatively large deviation, if and the resistance of the first resistance R 1 and the second resistance R 2 is too small, the proportionality coefficient of the error effect differential amplifier that will produce because of conductor resistance, preferably, the Standard resistance range of described the first resistance R 1 and the second resistance R 2 is 1k Ω ~ 100k Ω.
In the linear power supply that the present embodiment provides, two ends using sampling resistor Rs obtain voltage as sampled point, the voltage obtaining is inputed to in-phase amplifier, due to be not using one end of sampling resistor Rs and the internal reference of linear power supply as sampled point, therefore the error resistance that maskable conductor resistance and termination contact resistance form, accurately determine by the size of current of sampling resistor Rs, and then go to control the output of triode Q1 according to constant current reference voltage, make the output current of linear power supply more accurate; The linear power supply that the present embodiment provides can be for measuring micro-resistance, measure the internal resistance of cell, measuring resistance type transducer provides reliable constant-current source.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; the protection range being not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (10)

1. a linear power supply, it is characterized in that, comprising: civil power port, transformer, rectifier bridge, electric capacity, triode, diode, error amplifier, sampling resistor, differential amplifier, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance and the 6th resistance; Wherein,
The primary coil of described transformer connects described civil power port, and secondary coil connects two ac input ends of described rectifier bridge;
Two direct-flow input ends of described rectifier bridge connect described electric capacity;
The positive electrode of described electric capacity connects the collector electrode of described triode, and negative electrode connects the negative sense output of this linear power supply;
The base stage of described triode connects the anode of described diode;
One end of described sampling resistor connects the emitter of described triode, and the other end connects the forward output of this linear power supply;
The negative electrode of described diode connects the output of described error amplifier;
The in-phase input end ground connection of described error amplifier;
One end input constant current reference voltage of described the first resistance, the other end connects the inverting input of described error amplifier;
One end of described the second resistance connects the inverting input of described error amplifier, and the other end connects the output of described differential amplifier;
One end ground connection of described the 3rd resistance, the other end connects the in-phase input end of described differential amplifier;
One end of described the 4th resistance connects the homophase in-phase input end of described differential amplifier, and the other end connects one end of described sampling resistor;
One end of described the 5th resistance connects the inverting input of described differential amplifier, and the other end connects the other end of described sampling resistor;
One end of described the 6th resistance connects the inverting input of described differential amplifier, and the other end connects the output of described differential amplifier;
Described the 3rd resistance equates with the resistance of the 6th resistance, and described the 4th resistance equates with the resistance of the 5th resistance;
This linear power supply can be determined and control output current according to described constant current reference voltage, sampling resistor, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance.
2. linear power supply according to claim 1, is characterized in that, this linear power supply can be determined and control output current according to following formula:
I out = - R 2 R 1 × R 5 R 6 × V cc _ ref R s ; Or,
I out = - R 2 R 1 × R 4 R 3 × V cc _ ref R s ;
Wherein, I outfor the output current of this linear power supply; V cc_reffor constant current reference voltage; R sfor the resistance of sampling resistor; R 1it is the resistance of the first resistance; R 2it is the resistance of the second resistance; R 3it is the resistance of the 3rd resistance; R 4it is the resistance of the 4th resistance; R 5it is the resistance of the 5th resistance; R 6it is the resistance of the 6th resistance.
3. linear power supply according to claim 1, is characterized in that, described sampling resistor is patch-type resistance or direct plugging-in resistance.
4. linear power supply according to claim 1, is characterized in that, one end linking number weighted-voltage D/A converter of described the first resistance, and described constant current reference voltage is provided by described digital to analog converter.
5. linear power supply according to claim 1, is characterized in that, the Standard resistance range of described the 4th resistance and the 5th resistance is 1k Ω ~ 10k Ω, and the Standard resistance range of described the first resistance and the second resistance is 1k Ω ~ 100k Ω.
6. a linear power supply, is characterized in that, comprising: civil power port, transformer, rectifier bridge, electric capacity, triode, diode, error amplifier, sampling resistor, in-phase amplifier, the first resistance, the second resistance, the 5th resistance and the 6th resistance; Wherein,
The primary coil of described transformer connects described civil power port, and secondary coil connects two ac input ends of described rectifier bridge;
Two direct-flow input ends of described rectifier bridge connect described electric capacity;
The positive electrode of described electric capacity connects the collector electrode of described triode, and negative electrode connects power-to output;
The base stage of described triode connects the anode of described diode;
One end of described sampling resistor connects the emitter of described triode, and the other end connects power supply forward output;
The negative electrode of described diode connects the output of described error amplifier;
The in-phase input end ground connection of described error amplifier;
One end input constant current reference voltage of described the first resistance, the other end connects the reverse input end of described error amplifier;
One end of described the second resistance connects the reverse input end of described error amplifier, and the other end connects the output of described in-phase amplifier;
The in-phase input end of described in-phase amplifier connects one end of described sampling resistor;
One end of described the 5th resistance connects the inverting input of described in-phase amplifier, and the other end connects the other end of described sampling resistor;
One end of described the 6th resistance connects the inverting input of described in-phase amplifier, and the other end connects the output of described in-phase amplifier;
This linear power supply can be determined and control output current according to described constant current reference voltage, sampling resistor, the first resistance, the second resistance, the 5th resistance, the 6th resistance.
7. linear power supply according to claim 6, is characterized in that, this linear power supply can be determined and control output current according to following formula:
I out = - R 2 R 1 × ( R 5 R 6 + 1 ) × V cc _ ref R s ;
Wherein, I outfor the output current of this linear power supply; V cc_reffor constant current reference voltage; R sfor the resistance of sampling resistor; R 1it is the resistance of the first resistance; R 2it is the resistance of the second resistance; R 5it is the resistance of the 5th resistance; R 6it is the resistance of the 6th resistance.
8. linear power supply according to claim 6, is characterized in that, described sampling resistor is patch-type resistance or direct plugging-in resistance.
9. linear power supply according to claim 6, is characterized in that, one end linking number weighted-voltage D/A converter of described the first resistance, and described constant current reference voltage is provided by described digital to analog converter.
10. linear power supply according to claim 6, is characterized in that, the Standard resistance range of described the 5th resistance is 1k Ω ~ 10k Ω, and the Standard resistance range of described the first resistance and the second resistance is 1k Ω ~ 100k Ω.
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