CN206930700U - A kind of input voltage signal sample circuit in three-phase three-wire system pfc circuit - Google Patents
A kind of input voltage signal sample circuit in three-phase three-wire system pfc circuit Download PDFInfo
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- CN206930700U CN206930700U CN201720298227.8U CN201720298227U CN206930700U CN 206930700 U CN206930700 U CN 206930700U CN 201720298227 U CN201720298227 U CN 201720298227U CN 206930700 U CN206930700 U CN 206930700U
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Abstract
The utility model embodiment discloses the input voltage signal sample circuit in a kind of three-phase three-wire system pfc circuit, the input voltage signal sampling module of input voltage signal sampling module, the second phase and the input voltage signal sampling module of third phase including the first phase, wherein：The input voltage signal sampling module of first phase includes the first reference ground and sets circuit, the first bleeder circuit, the second bleeder circuit, the first operational amplifier and the first output circuit；The input voltage signal sampling module of second phase includes the second reference ground and sets circuit, the 3rd bleeder circuit, the 4th bleeder circuit, the second operational amplifier and the second output circuit；The input voltage signal sampling module of third phase includes the 3rd reference ground and sets circuit, the 5th bleeder circuit, the 6th bleeder circuit, the 3rd operational amplifier and the 3rd output circuit.Implement the utility model embodiment, the input voltage signal in three-phase three-wire system pfc circuit can be gathered in the case of in the absence of center line.
Description
Technical field
It the utility model is related to electronic circuit technology field, and in particular to the input in a kind of three-phase three-wire system pfc circuit
Voltage signal sampling circuit.
Background technology
At present, country is carrying forward vigorously charging infrastructure construction, and Three-phase high-power charger is to realize that ground is filled
A solution of electric installation.Generally, Three-phase high-power charger is generally divided into two parts：Prime Active PFC
(Power F actor Correction, PFC) and rear class dc source DCDC.Wherein, prime PFC is under the conditions of three-phase input
APFC, follow input current waveform by active circuit (such as active circuits) controlling switch device
Input voltage waveform, so as to reach raising power factor, reduce reactive current, line loss, improve the mesh of grid supply quality
's.
Sample, first can directly gather for the input AC AC voltage waveforms in common three-phase four-wire system pfc circuit
Phase line VINA, VINB, VINC voltage signal are inputted, is then compared successively with center line VINN again, you can obtain each phase line
AC voltage waveforms OUT_A, OUT_B, OUT_C.But found in putting into practice, many equipment are no center lines, such as：Engine.
If center line is not present in circuit, above-mentioned existing sample mode can not just collect input voltage signal.It can be seen that how
In the case of in the absence of center line, the input voltage signal gathered in pfc circuit is a technical task urgently to be resolved hurrily.
Utility model content
The utility model embodiment provides the input voltage signal sample circuit in a kind of three-phase three-wire system pfc circuit, can
In the case of in the absence of center line, to gather the input voltage signal in three-phase three-wire system pfc circuit.
The utility model embodiment provides the input voltage signal sample circuit in a kind of three-phase three-wire system pfc circuit,
Input voltage signal sampling module, the input voltage signal sampling module of the second phase and the input of third phase including the first phase
Voltage signal sampling module, wherein：
The input voltage signal sampling module of first phase include the first reference ground set circuit, the first bleeder circuit,
Second bleeder circuit, the first operational amplifier and the first output circuit；First reference ground sets the input of circuit to connect
The input of first bleeder circuit is connect, first reference ground sets the output end of circuit to connect second bleeder circuit
Output end, the output end of first bleeder circuit connects the positive input of first operational amplifier, described first
The output end of operational amplifier is all connected with the input of second bleeder circuit and first output circuit, and described
The reverse input end of one operational amplifier is connected with second bleeder circuit；First reference ground sets virtual one of circuit
Ground wire, for the reference ground of the input voltage signal sampling as first phase, the input voltage signal of first phase passes
The input of first bleeder circuit is transported to, through the first bleeder circuit partial pressure, is converted into the first low-voltage signal, described
The output end of one bleeder circuit exports first low-voltage signal to the positive input of first operational amplifier, through described
After the amplification of first operational amplifier, the first output voltage signal is obtained, described in the output end output of first operational amplifier
First outputs voltage signal to the input of the input of first output circuit and second bleeder circuit, and described
One output voltage signal is obtained and institute in the reverse input end of first operational amplifier through the second bleeder circuit partial pressure
The signal of the first output voltage signal matching is stated, the output end of first output circuit exports the first output voltage letter
Number, sampled with the input voltage signal to first phase；
The input voltage signal sampling module of second phase include the second reference ground set circuit, the 3rd bleeder circuit,
4th bleeder circuit, the second operational amplifier and the second output circuit；Second reference ground sets the input of circuit to connect
The input of the 3rd bleeder circuit is connect, second reference ground sets the output end of circuit to connect the 4th bleeder circuit
Output end, the output end of the 3rd bleeder circuit connects the positive input of second operational amplifier, described second
The output end of operational amplifier is all connected with the input of the 4th bleeder circuit and second output circuit, and described
The reverse input end of two operational amplifiers is connected with the 4th bleeder circuit；Second reference ground sets virtual one of circuit
Ground wire, for the reference ground of the input voltage signal sampling as second phase, the input voltage signal of second phase passes
The input of the 3rd bleeder circuit is transported to, through the 3rd bleeder circuit partial pressure, is converted into the second low-voltage signal, described
The output end of three bleeder circuits exports second low-voltage signal to the positive input of second operational amplifier, through described
After the amplification of second operational amplifier, the second output voltage signal is obtained, described in the output end output of second operational amplifier
Second outputs voltage signal to the input of the input of second output circuit and the 4th bleeder circuit, and described
Two output voltage signals are obtained and institute in the reverse input end of second operational amplifier through the 4th bleeder circuit partial pressure
The signal of the second output voltage signal matching is stated, the output end of second output circuit exports the second output voltage letter
Number, sampled with the input voltage signal to second phase；
The input voltage signal sampling module of the third phase include the 3rd reference ground set circuit, the 5th bleeder circuit,
6th bleeder circuit, the 3rd operational amplifier and the 3rd output circuit；3rd reference ground sets the input of circuit to connect
The input of the 5th bleeder circuit is connect, the 3rd reference ground sets the output end of circuit to connect the 6th bleeder circuit
Output end, the output end of the 5th bleeder circuit connects the positive input of the 3rd operational amplifier, the described 3rd
The output end of operational amplifier is all connected with the input of the 6th bleeder circuit and the 3rd output circuit, and described
The reverse input end of three operational amplifiers is connected with the 6th bleeder circuit；3rd reference ground sets virtual one of circuit
Ground wire, for the reference ground of the input voltage signal sampling as the third phase, the input voltage signal of the third phase passes
The input of the 5th bleeder circuit is transported to, through the 5th bleeder circuit partial pressure, is converted into the 3rd low-voltage signal, described
The output end of five bleeder circuits exports the 3rd low-voltage signal to the positive input of the 3rd operational amplifier, through described
After the amplification of 3rd operational amplifier, the 3rd output voltage signal is obtained, described in the output end output of the 3rd operational amplifier
3rd outputs voltage signal to the input of the input of the 3rd output circuit and the 6th bleeder circuit, and described
Three output voltage signals are obtained and institute in the reverse input end of the 3rd operational amplifier through the 6th bleeder circuit partial pressure
The signal of the 3rd output voltage signal matching is stated, the output end of the 3rd output circuit exports the 3rd output voltage letter
Number, sampled with the input voltage signal to the third phase.
Wherein, first reference ground sets circuit to include the first electric capacity and first resistor, first bleeder circuit
Including second resistance and 3rd resistor, second bleeder circuit includes the 4th resistance and the 5th resistance, the first output electricity
Road includes the 6th resistance, wherein：
The first end of first electric capacity connects with the first end of the first resistor, the first end of the second resistance
Connect, second end at the second end of first electric capacity and the second end of the first resistor, the 5th resistance is all connected with, described
Second end of first resistor is connected with the second end of the 5th resistance and the first resistor is connected with the 5th resistance
Point connects the reference ground that first reference ground sets circuit to fictionalize, the second end and the 3rd resistor of the second resistance
First end, the positive input of first operational amplifier are all connected with, and the positive input of first operational amplifier is also
The first end of the 3rd resistor is connected to first voltage, the output end of first operational amplifier and the 4th resistance
First end, the first end of the 6th resistance are all connected with, the second end and first operational amplifier of the 4th resistance
Reverse input end, the first end of the 5th resistance are all connected with.
Wherein, the input voltage signal sampling module of first phase also includes the second electric capacity, the 3rd electric capacity, the 4th electric capacity
And the 5th electric capacity, wherein：
The first end of second electric capacity is connected with the first end of the 4th resistance, the second end of second electric capacity with
The second end connection of 4th resistance, the first end of the 3rd electric capacity is connected with the first end of the 5th resistance, described
Second end of the 3rd electric capacity and the second end of the second resistance, the first end of the 4th electric capacity and the 3rd resistor
First end is all connected with, and the second end of the 4th electric capacity is connected with the second end of the 3rd resistor, and the of the 5th electric capacity
One end is connected with the second end of the 6th resistance, the second end ground connection of the 5th electric capacity.
Wherein, the first voltage is 1.5V, and the resistance value of the 5th resistance is far longer than the electricity of the 4th resistance
Resistance, first output voltage signal is identical with the phase of the input voltage signal of first phase, and first output
The amplitude of voltage signal is less than the amplitude of the input voltage signal of first phase.
Wherein, second reference ground sets circuit to include the 6th electric capacity and the 7th resistance, the 3rd bleeder circuit
Including the 8th resistance and the 9th resistance, the 4th bleeder circuit includes the tenth resistance and the 11st resistance, second output
Circuit includes the 12nd resistance, wherein：
The first end of 6th electric capacity connects with the first end of the 7th resistance, the first end of the 8th resistance
Connect, the second end and the second end of the 7th resistance, the second end of the 11st resistance of the 6th electric capacity are all connected with, institute
The second end for stating the 7th resistance is connected and the 7th resistance and the 11st resistance with the second end of the 11st resistance
The point of connection connects the reference ground that second reference ground sets circuit to fictionalize, the second end and the described 9th of the 8th resistance
The first end of resistance, the positive input of second operational amplifier are all connected with, second operational amplifier it is positive defeated
Enter to hold the first end for being also connected with the 9th resistance to second voltage, the output end of second operational amplifier and the described tenth
The first end of resistance, the first end of the 12nd resistance are all connected with, the second end and second computing of the tenth resistance
The reverse input end of amplifier, the first end of the 11st resistance are all connected with.
Wherein, the input voltage signal sampling module of second phase also includes the 7th electric capacity, the 8th electric capacity, the 9th electric capacity
And the tenth electric capacity, wherein：
The first end of 7th electric capacity is connected with the first end of the tenth resistance, the second end of the 7th electric capacity with
The second end connection of tenth resistance, the first end of the 8th electric capacity are connected with the first end of the 11st resistance, institute
State the second end of the 8th electric capacity and the second end of the 8th resistance, the first end of the 9th electric capacity and the 9th resistance
First end be all connected with, the second end of the 9th electric capacity is connected with the second end of the 9th resistance, the tenth electric capacity
First end is connected with the second end of the 12nd resistance, the second end ground connection of the tenth electric capacity.
Wherein, the second voltage is 1.5V, and the resistance value of the 11st resistance is far longer than the tenth resistance
Resistance value, second output voltage signal is identical with the phase of the input voltage signal of second phase, and described second defeated
Go out amplitude of the amplitude less than the input voltage signal of second phase of voltage signal.
Wherein, the 3rd reference ground sets circuit to include the 11st electric capacity and the 13rd resistance, the 5th partial pressure
Circuit includes the 14th resistance and the 15th resistance, and the 6th bleeder circuit includes the 16th resistance and the 17th resistance, institute
Stating the 3rd output circuit includes the 18th resistance, wherein：
The first end of 11st electric capacity and first end, the first end of the 14th resistance of the 13rd resistance
It is all connected with, the second end of the 11st electric capacity and the second end, the second end of the 17th resistance of the 13rd resistance
It is all connected with, the second end of the 13rd resistance is connected with the second end of the 17th resistance and the 13rd resistance and institute
The point for stating the connection of the 17th resistance connects the reference ground that the 3rd reference ground sets circuit to fictionalize, and the of the 14th resistance
Two ends are all connected with the first end of the 15th resistance, the positive input of the 3rd operational amplifier, the 3rd fortune
The positive input for calculating amplifier is also connected with the first end of the 15th resistance to tertiary voltage, the 3rd operational amplifier
Output end be all connected with the first end of the 16th resistance, the first end of the 18th resistance, the 16th resistance
The second end be all connected with the reverse input end of the 3rd operational amplifier, the first end of the 17th resistance.
Wherein, the input voltage signal sampling module of the third phase also includes the 12nd electric capacity, the 13rd electric capacity, the tenth
Four electric capacity and the 15th electric capacity, wherein：
The first end of 12nd electric capacity is connected with the first end of the 16th resistance, and the of the 12nd electric capacity
Two ends are connected with the second end of the 16th resistance, the first end of the 13rd electric capacity and the first of the 17th resistance
End connection, the second end of the 13rd electric capacity and the second end of the 14th resistance, the first end of the 14th electric capacity
And the first end of the 15th resistance is all connected with, the second end of the 14th electric capacity and the second of the 15th resistance
End connection, the first end of the 15th electric capacity is connected with the second end of the 18th resistance, and the of the 15th electric capacity
Two ends are grounded.
Wherein, the tertiary voltage is 1.5V, and the resistance value of the 17th resistance is far longer than the 16th resistance
Resistance value, the 3rd output voltage signal is identical with the phase of the input voltage signal of the third phase, and the described 3rd
The amplitude of output voltage signal is less than the amplitude of the input voltage signal of the third phase.
In the utility model embodiment, the input voltage signal sample circuit in three-phase three-wire system pfc circuit includes first
Input voltage signal sampling module, the input voltage signal sampling module of the second phase and the input voltage signal of third phase of phase
Sampling module, wherein, the input voltage signal sampling module of first phase includes the first reference ground and sets circuit, the first partial pressure
Circuit, the second bleeder circuit, the first operational amplifier and the first output circuit, the input voltage signal sampling of second phase
Module includes the second reference ground and sets circuit, the 3rd bleeder circuit, the 4th bleeder circuit, the second operational amplifier and second defeated
Go out circuit, the input voltage signal sampling module of the third phase includes the 3rd reference ground and sets circuit, the 5th bleeder circuit, the
Six bleeder circuits, the 3rd operational amplifier and the 3rd output circuit.The input voltage signal sampling module of first phase leads to
Cross the first reference ground and circuit, the first bleeder circuit, the second bleeder circuit, the first operational amplifier and the first output circuit are set
The input voltage signal of first phase is sampled, the input voltage signal sampling module of second phase passes through the second reference ground
Circuit, the 3rd bleeder circuit, the 4th bleeder circuit, the second operational amplifier and the second output circuit are set to the defeated of the second phase
Enter voltage signal to be sampled, the input voltage signal sampling module of the third phase sets circuit, the by the 3rd reference ground
The input voltage signal of five bleeder circuits, the 6th bleeder circuit, the 3rd operational amplifier and the 3rd output circuit to third phase
Sampled, so as to realize in the case of in the absence of center line, gather the input voltage letter in three-phase three-wire system pfc circuit
Number.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the input voltage signal sampling in a kind of three-phase three-wire system pfc circuit disclosed in the utility model embodiment
The structural representation of circuit；
Fig. 2 is that the input voltage signal in another three-phase three-wire system pfc circuit disclosed in the utility model embodiment is adopted
The structural representation of sample circuit；
Fig. 3 is that the input voltage signal in another three-phase three-wire system pfc circuit disclosed in the utility model embodiment is adopted
The structural representation of sample circuit；
Fig. 4 is that the input voltage signal in another three-phase three-wire system pfc circuit disclosed in the utility model embodiment is adopted
The structural representation of sample circuit；
Fig. 5 is the contrast signal of a kind of input voltage waveform and output voltage waveforms disclosed in the utility model embodiment
Figure.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, to the technical scheme in the utility model embodiment
It is clearly and completely described.Obviously, described embodiment is a part of embodiment of the present utility model, rather than
Whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative labor
The every other embodiment obtained on the premise of dynamic, it should all belong to the scope of the utility model protection.
The utility model embodiment provides the input voltage signal sample circuit in a kind of three-phase three-wire system pfc circuit, can
In the case of in the absence of center line, to gather the input voltage signal in three-phase three-wire system pfc circuit.Carry out individually below detailed
Explanation.
Referring to Fig. 1, Fig. 1 is the input electricity in a kind of three-phase three-wire system pfc circuit disclosed in the utility model embodiment
Press the structural representation of signal sample circuit.As shown in figure 1, in three-phase three-wire system pfc circuit described in the present embodiment
Input voltage signal sample circuit, including the input voltage signal sampling module 100 of the first phase, the input voltage signal of the second phase
The input voltage signal sampling module 300 of sampling module 200 and third phase, wherein：
The input voltage signal sampling module 100 of first phase includes the first reference ground and sets circuit 101, the first bleeder circuit
102nd, the second bleeder circuit 103, the first operational amplifier 104 and the first output circuit 105；First reference ground sets electricity
The input on road 101 connects the input of first bleeder circuit 102, and first reference ground sets the output of circuit 101
End connects the output end of second bleeder circuit 103, and the output end of first bleeder circuit 102 connects first computing
The positive input of amplifier 104 (i.e. U1A), the output end of first operational amplifier 104 (i.e. U1A) with described second point
The input of volt circuit 103 and first output circuit 105 are all connected with, first operational amplifier 104 (i.e. U1A)
Reverse input end is connected with second bleeder circuit 103；First reference ground sets 101 virtual ground wires of circuit, uses
In the reference ground DGND of the input voltage signal VIN A samplings as first phase, the input voltage signal of first phase
VIN A are transmitted to the input of first bleeder circuit 102, and through the partial pressure of the first bleeder circuit 102, it is low to be converted into first
Signal is pressed, the output end of first bleeder circuit 102 exports first low-voltage signal to first operational amplifier 104
The positive input of (i.e. U1A), after first operational amplifier 104 (i.e. U1A) is amplified, obtain the first output voltage letter
Number, the output end of first operational amplifier 104 (i.e. U1A) exports the first output voltage signal OUT_A to described the
The input of the input of one output circuit 105 and second bleeder circuit 103, the first output voltage signal OUT_
A is obtained and institute in the reverse input end of first operational amplifier 104 (i.e. U1A) through the partial pressure of the second bleeder circuit 103
State the signal of the first output voltage signal OUT_A matchings, output end output first output of first output circuit 105
Voltage signal OUT_A, sampled with the input voltage signal VIN A to first phase；
The input voltage signal sampling module 200 of second phase includes the second reference ground and sets circuit 201, the 3rd bleeder circuit
202nd, the 4th bleeder circuit 203, the second operational amplifier 204 and the second output circuit 205；Second reference ground sets electricity
The input on road 201 connects the input of the 3rd bleeder circuit 202, and second reference ground sets the output of circuit 201
End connects the output end of the 4th bleeder circuit 203, and the output end of the 3rd bleeder circuit 202 connects second computing
The positive input of amplifier 204 (i.e. U1B), the output end of second operational amplifier 204 (i.e. U1B) with described 4th point
The input of volt circuit 203 and second output circuit 205 are all connected with, second operational amplifier 204 (i.e. U1B)
Reverse input end is connected with the 4th bleeder circuit 203；Second reference ground sets 201 virtual ground wires of circuit, uses
In the reference ground DGND of the input voltage signal VIN B samplings as second phase, the input voltage signal of second phase
VIN B are transmitted to the input of the 3rd bleeder circuit 202, and through the partial pressure of the 3rd bleeder circuit 202, it is low to be converted into second
Signal is pressed, the output end of the 3rd bleeder circuit 202 exports second low-voltage signal to second operational amplifier 204
The positive input of (i.e. U1B), after second operational amplifier 204 (i.e. U1B) is amplified, obtain the second output voltage letter
Number, the output end of second operational amplifier 204 (i.e. U1B) exports the second output voltage signal OUT_B to described the
The input of the input of two output circuits 205 and the 4th bleeder circuit 203, the second output voltage signal OUT_
B is obtained and institute in the reverse input end of second operational amplifier 204 (i.e. U1B) through the partial pressure of the 4th bleeder circuit 203
State the signal of the second output voltage signal OUT_B matchings, output end output second output of second output circuit 205
Voltage signal OUT_B, sampled with the input voltage signal VIN B to second phase；
The input voltage signal sampling module 300 of third phase includes the 3rd reference ground and sets circuit 301, the 5th bleeder circuit
302nd, the 6th bleeder circuit 303, the 3rd operational amplifier 304 and the 3rd output circuit 305；3rd reference ground sets electricity
The input on road 301 connects the input of the 5th bleeder circuit 302, and the 3rd reference ground sets the output of circuit 301
End connects the output end of the 6th bleeder circuit 303, and the output end of the 5th bleeder circuit 302 connects the 3rd computing
The positive input of amplifier 304 (i.e. U1C), the output end of the 3rd operational amplifier 304 (i.e. U1C) with described 6th point
The input of volt circuit 303 and the 3rd output circuit 305 are all connected with, the 3rd operational amplifier 304 (i.e. U1C)
Reverse input end is connected with the 6th bleeder circuit 303；3rd reference ground sets 301 virtual ground wires of circuit, uses
In the reference ground DGND of the input voltage signal VIN C samplings as the third phase, the input voltage signal of the third phase
VIN C are transmitted to the input of the 5th bleeder circuit 302, and through the partial pressure of the 5th bleeder circuit 302, it is low to be converted into the 3rd
Signal is pressed, the output end of the 5th bleeder circuit 302 exports the 3rd low-voltage signal to the 3rd operational amplifier 304
The positive input of (i.e. U1C), after the 3rd operational amplifier 304 (i.e. U1C) is amplified, obtain the 3rd output voltage letter
Number, the output end of the 3rd operational amplifier 304 (i.e. U1C) exports the 3rd output voltage signal OUT_C to described the
The input of the input of three output circuits 305 and the 6th bleeder circuit 303, the 3rd output voltage signal OUT_
C is obtained and institute in the reverse input end of the 3rd operational amplifier 304 (i.e. U1C) through the partial pressure of the 6th bleeder circuit 303
State the signal of the 3rd output voltage signal OUT_C matchings, output end output the 3rd output of the 3rd output circuit 305
Voltage signal OUT_C, sampled with the input voltage signal VIN C to the third phase.
In the utility model embodiment, the input voltage signal sample circuit in three-phase three-wire system pfc circuit includes first
The input electricity of the input voltage signal sampling module 100 of phase, the input voltage signal sampling module 200 of the second phase and third phase
Signal sampling module 300 is pressed, wherein, the input voltage signal sampling module 100 of first phase is set including the first reference ground
Circuit 101, the first bleeder circuit 102, the second bleeder circuit 103, the first operational amplifier 104 and the first output circuit 105,
The input voltage signal sampling module 200 of second phase include the second reference ground set circuit 201, the 3rd bleeder circuit 202,
4th bleeder circuit 203, the second operational amplifier 204 and the second output circuit 205, the input voltage signal of the third phase
Sampling module 300 includes the 3rd reference ground and sets circuit 301, the 5th bleeder circuit 302, the 6th bleeder circuit 303, the 3rd computing
The output circuit 305 of amplifier 304 and the 3rd.The input voltage signal sampling module 100 of first phase passes through the first reference
Ground sets circuit 101, the first bleeder circuit 102, the second bleeder circuit 103, the first operational amplifier 104 and the first output electricity
Road 105 samples to the input voltage signal of the first phase, and the input voltage signal sampling module 200 of second phase passes through
Two reference grounds set circuit 201, the 3rd bleeder circuit 202, the 4th bleeder circuit 203, the second operational amplifier 204 and second
Output circuit 205 samples to the input voltage signal of the second phase, the input voltage signal sampling module 300 of the third phase
By the 3rd reference ground set circuit 301, the 5th bleeder circuit 302, the 6th bleeder circuit 303, the 3rd operational amplifier 304 with
And the 3rd output circuit 305 input voltage signal of third phase is sampled, so as to realize in the feelings in the absence of center line
Under condition, the input voltage signal in three-phase three-wire system pfc circuit is gathered.
Optionally, please also refer to Fig. 2, Fig. 2 is another three-phase three-wire system PFC electricity disclosed in the utility model embodiment
The structural representation of input voltage signal sample circuit in road.As shown in Fig. 2 the three-phase three-wire system described in the present embodiment
In input voltage signal sample circuit in pfc circuit, for the input voltage signal sampling module 100 of the first phase, institute
Stating the first reference ground sets circuit 101 to include the first electric capacity C1 and first resistor R1, and first bleeder circuit 102 includes the
Two resistance R2 and 3rd resistor R3, second bleeder circuit 103 include the 4th resistance R4 and the 5th resistance R5, and described first is defeated
Going out circuit 105 includes the 6th resistance R6, wherein：
The first end of the first electric capacity C1 and the first end of the first resistor R1, the first end of the second resistance R2
It is all connected with, the second end of the first electric capacity C1 and the second end of the first resistor R1, the second end of the 5th resistance R5
It is all connected with, the second end of the first resistor R1 is connected with the second end of the 5th resistance R5 and the first resistor R1 and institute
The point for stating the 5th resistance R5 connections connects the reference ground DGND that first reference ground sets circuit 101 to fictionalize, second electricity
Hinder R2 the second end and the first end of the 3rd resistor R3, the positive input of first operational amplifier 104 (i.e. U1A)
It is all connected with, the first end that the positive input of first operational amplifier 104 (i.e. U1A) is also connected with the 3rd resistor R3 arrives
First voltage, the output end of first operational amplifier 104 (i.e. U1A) and the 4th resistance R4 first end, described the
Six resistance R6 first end is all connected with, the second end of the 4th resistance R4 and first operational amplifier 104 (i.e. U1A)
Reverse input end, the first end of the 5th resistance R5 are all connected with.
Optionally, the input voltage signal sampling module 100 of first phase also includes the second electric capacity C2, the 3rd electric capacity
C3, the 4th electric capacity C4 and the 5th electric capacity C5, wherein：
The first end of the second electric capacity C2 is connected with the first end of the 4th resistance R4, and the of the second electric capacity C2
Two ends are connected with the second end of the 4th resistance R4, the first end of the 3rd electric capacity C3 and the first of the 5th resistance R5
End connection, the second end of the 3rd electric capacity C3 and the second end of the second resistance R2, the first end of the 4th electric capacity C4
And the first end of the 3rd resistor R3 is all connected with, the second end of the 4th electric capacity C4 and the second of the 3rd resistor R3
End connection, the first end of the 5th electric capacity C5 is connected with the second end of the 6th resistance R6, and the of the 5th electric capacity C5
Two ends are grounded DGND.
Wherein, the first voltage is 1.5V, and the resistance value of the 5th resistance R5 is far longer than the 4th resistance R4
Resistance value, the first output voltage signal OUT_A is identical with the input voltage signal VIN A of first phase phase,
And the amplitude of the first output voltage signal OUT_A is less than the input voltage signal VIN A of first phase amplitude.
Wherein, above-mentioned second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4 and the 5th electric capacity C5 are decoupling capacitor,
Can be with the High-frequency Interference in filtering circuit.
Optionally, please also refer to Fig. 3, Fig. 3 is another three-phase three-wire system PFC electricity disclosed in the utility model embodiment
The structural representation of input voltage signal sample circuit in road.Shown in Fig. 3, the three-phase three-wire system described in the present embodiment
In input voltage signal sample circuit in pfc circuit, for the input voltage signal sampling module 200 of the second phase, institute
Stating the second reference ground sets circuit 201 to include the 6th electric capacity C6 and the 7th resistance R7, and the 3rd bleeder circuit 202 includes the
Eight resistance R8 and the 9th resistance R9, the 4th bleeder circuit 203 include the tenth resistance R10 and the 11st resistance R11, and described
Two output circuits 205 include the 12nd resistance R12, wherein：
The first end of the 6th electric capacity C6 and first end, the first end of the 8th resistance R8 of the 7th resistance R7
It is all connected with, the second end of the 6th electric capacity C6 and the second end of the 7th resistance R7, the second of the 11st resistance R11
End is all connected with, and the second end of the 7th resistance R7 is connected with the second end of the 11st resistance R11 and the 7th resistance
R7 and the 11st resistance R11 points being connected meet the reference ground DGND that second reference ground sets circuit 201 to fictionalize, institute
State the 8th resistance R8 the second end and the first end of the 9th resistance R9, second operational amplifier 204 (i.e. U1B) just
It is all connected with to input, the positive input of second operational amplifier 204 (i.e. U1B) is also connected with the 9th resistance R9's
First end is to second voltage, the output end of second operational amplifier 204 (i.e. U1B) and the first of the tenth resistance R10
End, the first end of the 12nd resistance R12 are all connected with, the second end and second operation amplifier of the tenth resistance R10
The reverse input end of device 204 (i.e. U1B), the first end of the 11st resistance R11 are all connected with.
Optionally, the input voltage signal sampling module 200 of second phase also includes the 7th electric capacity C7, the 8th electric capacity
C8, the 9th electric capacity C9 and the tenth electric capacity C10, wherein：
The first end of the 7th electric capacity C7 is connected with the first end of the tenth resistance R10, the 7th electric capacity C7's
Second end is connected with the second end of the tenth resistance R10, first end and the 11st resistance R11 of the 8th electric capacity C8
First end connection, the second end of the 8th electric capacity C8 and the second end of the 8th resistance R8, the 9th electric capacity C9
First end and the first end of the 9th resistance R9 are all connected with, the second end and the 9th resistance R9 of the 9th electric capacity C9
The connection of the second end, the first end of the tenth electric capacity C10 is connected with the second end of the 12nd resistance R12, the described tenth
Electric capacity C10 the second end ground connection DGND.
Wherein, the second voltage is 1.5V, and the resistance value of the 11st resistance R11 is far longer than the tenth resistance
R10 resistance value, the second output voltage signal OUT_B and the input voltage signal VIN B of second phase phase phase
Together, and the second output voltage signal OUT_B amplitude be less than second phase input voltage signal VIN B amplitude.
Wherein, above-mentioned 7th electric capacity C7, the 8th electric capacity C8, the 9th electric capacity C9 and the tenth electric capacity C10 are decoupling capacitor,
Can be with the High-frequency Interference in filtering circuit.
Optionally, please also refer to Fig. 4, Fig. 4 is another three-phase three-wire system PFC electricity disclosed in the utility model embodiment
The structural representation of input voltage signal sample circuit in road.As shown in figure 4, the three-phase three-wire system described in the present embodiment
In input voltage signal sample circuit in pfc circuit, for the input voltage signal sampling module 300 of third phase, institute
Stating the 3rd reference ground sets circuit 301 to include the 11st electric capacity C11 and the 13rd resistance R13, the 5th bleeder circuit 302
Including the 14th resistance R14 and the 15th resistance R15, the 6th bleeder circuit 303 includes the 16th resistance R16 and the 17th
Resistance R17, the 3rd output circuit 305 include the 18th resistance R18, wherein：
The first end of the 11st electric capacity C11 and the first end of the 13rd resistance R13, the 14th resistance
R14 first end is all connected with, the second end of the 11st electric capacity C11 and the 13rd resistance R13 the second end, described the
17 resistance R17 the second end is all connected with, the second end of the 13rd resistance R13 and the second of the 17th resistance R17
End connection and the 13rd resistance R13 connect the 3rd reference ground with the 17th resistance R17 points being connected and set circuit
The 301 reference ground DGND fictionalized, the second end of the 14th resistance R14 and the first end of the 15th resistance R15, institute
The positive input for stating the 3rd operational amplifier 304 (i.e. U1C) is all connected with, and the 3rd operational amplifier 304 (i.e. U1C) is just
The first end of the 15th resistance R15 is also connected with to tertiary voltage to input, and the 3rd operational amplifier 304 is (i.e.
U1C output end) is all connected with the first end of the 16th resistance R16, the first end of the 18th resistance R18, described
Reverse input end, ten seven electricity of 16th resistance R16 the second end with the 3rd operational amplifier 304 (i.e. U1C)
Resistance R17 first end is all connected with.
Optionally, the input voltage signal sampling module 300 of the third phase also includes the 12nd electric capacity C12, the 13rd
Electric capacity C13, the 14th electric capacity C14 and the 15th electric capacity C15, wherein：
The first end of the 12nd electric capacity C12 is connected with the first end of the 16th resistance R16, the 12nd electricity
Hold C12 the second end be connected with the second end of the 16th resistance R16, the first end of the 13rd electric capacity C13 with it is described
17th resistance R17 first end connection, the second end of the 13rd electric capacity C13 and the second of the 14th resistance R14
The first end at end, the first end of the 14th electric capacity C14 and the 15th resistance R15 is all connected with, the 14th electricity
Hold C14 the second end be connected with the second end of the 15th resistance R15, the first end of the 15th electric capacity C15 with it is described
18th resistance R18 the second end connection, the second end ground connection DGND of the 15th electric capacity C15.
Wherein, above-mentioned 12nd electric capacity C12, the 13rd electric capacity C13, the 14th electric capacity C14 and the 15th electric capacity C15 are equal
, can be with the High-frequency Interference in filtering circuit for decoupling capacitor.
Wherein, the tertiary voltage is 1.5V, and the resistance value of the 17th resistance R17 is far longer than the 16th electricity
Hinder R16 resistance value, the 3rd output voltage signal OUT_C and the input voltage signal VIN C of the third phase phase
It is identical, and the amplitude of the 3rd output voltage signal OUT_C is less than the input voltage signal VIN C of third phase width
Value.
Please also refer to Fig. 5, Fig. 5 is a kind of input voltage waveform disclosed in the utility model embodiment and output voltage ripple
The contrast schematic diagram of shape.Wherein, the input voltage signal VIN A that can be used for schematically describing the first phase shown in Fig. 5 with
The contrast of waveform, can be used for schematically describing the defeated of the second phase between first output voltage signal OUT_A of the first phase
Enter the contrast of waveform between voltage signal VIN B and the second output voltage signal OUT_B of the second phase, can be used for schematically
Ground describes the contrast of waveform between the input voltage signal VIN C of third phase and the 3rd output voltage signal OUT_C of third phase.
As can be seen from Figure 5 input voltage signal is identical with output voltage signal phase, and the amplitude of output voltage signal is less than defeated
Enter the amplitude of voltage signal.
It should be noted that the first end of the electric capacity in the utility model embodiment refers generally to the positive pole of electric capacity, electric capacity
Second end refers generally to the negative pole of electric capacity, and the first end of resistance and the second end are not different.
Input voltage signal in a kind of three-phase three-wire system pfc circuit provided above the utility model embodiment is adopted
Sample circuit is described in detail, and specific case used herein is explained principle of the present utility model and embodiment
State, the explanation of above example is only intended to help and understands core concept of the present utility model；Meanwhile for the general of this area
Technical staff, according to thought of the present utility model, there will be changes in specific embodiments and applications, to sum up institute
State, this specification content should not be construed as to limitation of the present utility model.
Claims (10)
1. the input voltage signal sample circuit in a kind of three-phase three-wire system pfc circuit, it is characterised in that including the defeated of the first phase
Enter the input voltage signal sampling mould of voltage signal sampling module, the input voltage signal sampling module of the second phase and third phase
Block, wherein：
The input voltage signal sampling module of first phase includes the first reference ground and sets circuit, the first bleeder circuit, second
Bleeder circuit, the first operational amplifier and the first output circuit；First reference ground sets the input connection institute of circuit
The input of the first bleeder circuit is stated, first reference ground sets the output end of circuit to connect the defeated of second bleeder circuit
Go out end, the output end of first bleeder circuit connects the positive input of first operational amplifier, first computing
The output end of amplifier is all connected with the input of second bleeder circuit and first output circuit, first fortune
The reverse input end for calculating amplifier is connected with second bleeder circuit；First reference ground sets the virtual ground of circuit
Line, for the reference ground of the input voltage signal sampling as first phase, the input voltage signal transmission of first phase
To the input of first bleeder circuit, through the first bleeder circuit partial pressure, the first low-voltage signal is converted into, described first
The output end of bleeder circuit exports first low-voltage signal to the positive input of first operational amplifier, through described the
After the amplification of one operational amplifier, the first output voltage signal is obtained, the output end output of first operational amplifier described the
One outputs voltage signal to the input of the input of first output circuit and second bleeder circuit, and described first
Output voltage signal through the second bleeder circuit partial pressure, the reverse input end of first operational amplifier obtain with it is described
The signal of first output voltage signal matching, the output end of first output circuit export first output voltage signal,
Sampled with the input voltage signal to first phase；
The input voltage signal sampling module of second phase includes the second reference ground and sets circuit, the 3rd bleeder circuit, the 4th
Bleeder circuit, the second operational amplifier and the second output circuit；Second reference ground sets the input connection institute of circuit
The input of the 3rd bleeder circuit is stated, second reference ground sets the output end of circuit to connect the defeated of the 4th bleeder circuit
Go out end, the output end of the 3rd bleeder circuit connects the positive input of second operational amplifier, second computing
The output end of amplifier is all connected with the input of the 4th bleeder circuit and second output circuit, second fortune
The reverse input end for calculating amplifier is connected with the 4th bleeder circuit；Second reference ground sets the virtual ground of circuit
Line, for the reference ground of the input voltage signal sampling as second phase, the input voltage signal transmission of second phase
To the input of the 3rd bleeder circuit, through the 3rd bleeder circuit partial pressure, the second low-voltage signal is converted into, the described 3rd
The output end of bleeder circuit exports second low-voltage signal to the positive input of second operational amplifier, through described the
After the amplification of two operational amplifiers, the second output voltage signal is obtained, the output end output of second operational amplifier described the
Two output voltage signal to the input of the input of second output circuit and the 4th bleeder circuit, and described second
Output voltage signal through the 4th bleeder circuit partial pressure, the reverse input end of second operational amplifier obtain with it is described
The signal of second output voltage signal matching, the output end of second output circuit export second output voltage signal,
Sampled with the input voltage signal to second phase；
The input voltage signal sampling module of the third phase includes the 3rd reference ground and sets circuit, the 5th bleeder circuit, the 6th
Bleeder circuit, the 3rd operational amplifier and the 3rd output circuit；3rd reference ground sets the input connection institute of circuit
The input of the 5th bleeder circuit is stated, the 3rd reference ground sets the output end of circuit to connect the defeated of the 6th bleeder circuit
Go out end, the output end of the 5th bleeder circuit connects the positive input of the 3rd operational amplifier, the 3rd computing
The output end of amplifier is all connected with the input of the 6th bleeder circuit and the 3rd output circuit, the 3rd fortune
The reverse input end for calculating amplifier is connected with the 6th bleeder circuit；3rd reference ground sets the virtual ground of circuit
Line, for the reference ground of the input voltage signal sampling as the third phase, the input voltage signal transmission of the third phase
To the input of the 5th bleeder circuit, through the 5th bleeder circuit partial pressure, the 3rd low-voltage signal is converted into, the described 5th
The output end of bleeder circuit exports the 3rd low-voltage signal to the positive input of the 3rd operational amplifier, through described the
After the amplification of three operational amplifiers, the 3rd output voltage signal is obtained, the output end output of the 3rd operational amplifier described the
Three output voltage signal to the input of the input of the 3rd output circuit and the 6th bleeder circuit, and the described 3rd
Output voltage signal through the 6th bleeder circuit partial pressure, the reverse input end of the 3rd operational amplifier obtain with it is described
The signal of 3rd output voltage signal matching, the output end of the 3rd output circuit export the 3rd output voltage signal,
Sampled with the input voltage signal to the third phase.
2. the input voltage signal sample circuit in three-phase three-wire system pfc circuit according to claim 1, its feature exist
In first reference ground sets circuit to include the first electric capacity and first resistor, and first bleeder circuit includes the second electricity
Resistance and 3rd resistor, second bleeder circuit include the 4th resistance and the 5th resistance, and first output circuit includes the 6th
Resistance, wherein：
The first end of first electric capacity is all connected with the first end of the first resistor, the first end of the second resistance, institute
State the second end of the first electric capacity and the second end of the first resistor, the second end of the 5th resistance to be all connected with, described first
Second end of resistance is connected with the second end of the 5th resistance and the first resistor connects with the point that the 5th resistance is connected
First reference ground sets the reference ground that circuit fictionalizes, the second end of the second resistance and the first of the 3rd resistor
End, the positive input of first operational amplifier are all connected with, and the positive input of first operational amplifier is also connected with
The first end of the 3rd resistor is to first voltage, the output end of first operational amplifier and the first of the 4th resistance
End, the first end of the 6th resistance are all connected with, and the second end of the 4th resistance is reverse with first operational amplifier
Input, the first end of the 5th resistance are all connected with.
3. the input voltage signal sample circuit in three-phase three-wire system pfc circuit according to claim 2, its feature exist
In the input voltage signal sampling module of first phase also includes the second electric capacity, the 3rd electric capacity, the 4th electric capacity and the 5th electricity
Hold, wherein：
The first end of second electric capacity is connected with the first end of the 4th resistance, the second end of second electric capacity with it is described
The second end connection of 4th resistance, the first end of the 3rd electric capacity are connected with the first end of the 5th resistance, and the described 3rd
Second end of electric capacity and the first of the second end of the second resistance, the first end of the 4th electric capacity and the 3rd resistor
End is all connected with, and the second end of the 4th electric capacity is connected with the second end of the 3rd resistor, the first end of the 5th electric capacity
It is connected with the second end of the 6th resistance, the second end ground connection of the 5th electric capacity.
4. the input voltage signal sample circuit in three-phase three-wire system pfc circuit according to Claims 2 or 3, its feature
It is, the first voltage is 1.5V, and the resistance value of the 5th resistance is far longer than the resistance value of the 4th resistance, described
First output voltage signal is identical with the phase of the input voltage signal of first phase, and first output voltage signal
Amplitude is less than the amplitude of the input voltage signal of first phase.
5. the input voltage signal sample circuit in three-phase three-wire system pfc circuit according to claim 4, its feature exist
In second reference ground sets circuit to include the 6th electric capacity and the 7th resistance, and the 3rd bleeder circuit includes the 8th electricity
Resistance and the 9th resistance, the 4th bleeder circuit include the tenth resistance and the 11st resistance, and second output circuit includes the
12 resistance, wherein：
The first end of 6th electric capacity is all connected with the first end of the 7th resistance, the first end of the 8th resistance, institute
The second end and the second end of the 7th resistance, the second end of the 11st resistance for stating the 6th electric capacity are all connected with, and described
Second end of seven resistance is connected with the second end of the 11st resistance and the 7th resistance is connected with the 11st resistance
Point connect the reference ground that second reference ground sets circuit to fictionalize, the second end and the 9th resistance of the 8th resistance
First end, the positive input of second operational amplifier be all connected with, the positive input of second operational amplifier
The first end of the 9th resistance is also connected with to second voltage, the output end of second operational amplifier and the tenth resistance
First end, the first end of the 12nd resistance be all connected with, the second end of the tenth resistance and second operation amplifier
The reverse input end of device, the first end of the 11st resistance are all connected with.
6. the input voltage signal sample circuit in three-phase three-wire system pfc circuit according to claim 5, its feature exist
In the input voltage signal sampling module of second phase also includes the 7th electric capacity, the 8th electric capacity, the 9th electric capacity and the tenth electricity
Hold, wherein：
The first end of 7th electric capacity is connected with the first end of the tenth resistance, the second end of the 7th electric capacity with it is described
The second end connection of tenth resistance, the first end of the 8th electric capacity is connected with the first end of the 11st resistance, and described the
Second end of the second end of eight electric capacity and the 8th resistance, the of the first end of the 9th electric capacity and the 9th resistance
One end is all connected with, and the second end of the 9th electric capacity is connected with the second end of the 9th resistance, and the first of the tenth electric capacity
End is connected with the second end of the 12nd resistance, the second end ground connection of the tenth electric capacity.
7. the input voltage signal sample circuit in three-phase three-wire system pfc circuit according to claim 5 or 6, its feature
It is, the second voltage is 1.5V, and the resistance value of the 11st resistance is far longer than the resistance value of the tenth resistance, institute
It is identical with the phase of the input voltage signal of second phase to state the second output voltage signal, and second output voltage signal
Amplitude be less than second phase input voltage signal amplitude.
8. the input voltage signal sample circuit in three-phase three-wire system pfc circuit according to claim 7, its feature exist
Circuit is set to include the 11st electric capacity and the 13rd resistance in, the 3rd reference ground, the 5th bleeder circuit includes the
14 resistance and the 15th resistance, the 6th bleeder circuit include the 16th resistance and the 17th resistance, the 3rd output
Circuit includes the 18th resistance, wherein：
The first end of 11st electric capacity connects with the first end of the 13rd resistance, the first end of the 14th resistance
Connect, the second end and the second end of the 13rd resistance, the second end of the 17th resistance of the 11st electric capacity connect
Connect, the second end of the 13rd resistance is connected with the second end of the 17th resistance and the 13rd resistance and described the
The point of 17 resistance connection connects the reference ground that the 3rd reference ground sets circuit to fictionalize, the second end of the 14th resistance
The positive input of first end, the 3rd operational amplifier with the 15th resistance is all connected with, and the 3rd computing is put
The positive input of big device is also connected with the first end of the 15th resistance to tertiary voltage, the 3rd operational amplifier it is defeated
Go out end to be all connected with the first end of the 16th resistance, the first end of the 18th resistance, the of the 16th resistance
Two ends are all connected with the reverse input end of the 3rd operational amplifier, the first end of the 17th resistance.
9. the input voltage signal sample circuit in three-phase three-wire system pfc circuit according to claim 8, its feature exist
In the input voltage signal sampling module of, the third phase also include the 12nd electric capacity, the 13rd electric capacity, the 14th electric capacity and
15th electric capacity, wherein：
The first end of 12nd electric capacity is connected with the first end of the 16th resistance, the second end of the 12nd electric capacity
It is connected with the second end of the 16th resistance, the first end of the 13rd electric capacity connects with the first end of the 17th resistance
Connect, the second end of the 13rd electric capacity and the second end of the 14th resistance, the 14th electric capacity first end and
The first end of 15th resistance is all connected with, and the second end of the 14th electric capacity connects with the second end of the 15th resistance
Connect, the first end of the 15th electric capacity is connected with the second end of the 18th resistance, the second end of the 15th electric capacity
Ground connection.
10. the input voltage signal sample circuit in three-phase three-wire system pfc circuit according to claim 8 or claim 9, its feature
It is, the tertiary voltage is 1.5V, and the resistance value of the 17th resistance is far longer than the resistance value of the 16th resistance,
3rd output voltage signal is identical with the phase of the input voltage signal of the third phase, and the 3rd output voltage is believed
Number amplitude be less than the third phase input voltage signal amplitude.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720298227.8U CN206930700U (en) | 2017-03-25 | 2017-03-25 | A kind of input voltage signal sample circuit in three-phase three-wire system pfc circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720298227.8U CN206930700U (en) | 2017-03-25 | 2017-03-25 | A kind of input voltage signal sample circuit in three-phase three-wire system pfc circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108323185A (en) * | 2017-03-25 | 2018-07-24 | 深圳欣锐科技股份有限公司 | A kind of input voltage signal sample circuit in three-phase three-wire system pfc circuit |
| CN111398670A (en) * | 2020-04-20 | 2020-07-10 | 南通三本电子有限公司 | Three-phase three-wire voltage and current signal acquisition circuit |
| CN111751605A (en) * | 2019-03-29 | 2020-10-09 | 全球能源互联网研究院有限公司 | High potential voltage measuring device and method |
-
2017
- 2017-03-25 CN CN201720298227.8U patent/CN206930700U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108323185A (en) * | 2017-03-25 | 2018-07-24 | 深圳欣锐科技股份有限公司 | A kind of input voltage signal sample circuit in three-phase three-wire system pfc circuit |
| CN108323185B (en) * | 2017-03-25 | 2020-09-15 | 深圳欣锐科技股份有限公司 | Input voltage signal sampling circuit in three-phase three-wire system PFC circuit |
| CN111751605A (en) * | 2019-03-29 | 2020-10-09 | 全球能源互联网研究院有限公司 | High potential voltage measuring device and method |
| CN111751605B (en) * | 2019-03-29 | 2024-01-16 | 全球能源互联网研究院有限公司 | High-potential voltage measuring device and method |
| CN111398670A (en) * | 2020-04-20 | 2020-07-10 | 南通三本电子有限公司 | Three-phase three-wire voltage and current signal acquisition circuit |
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