CN109596881A - A kind of alternating voltage sampling circuit and system - Google Patents
A kind of alternating voltage sampling circuit and system Download PDFInfo
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- CN109596881A CN109596881A CN201811496835.5A CN201811496835A CN109596881A CN 109596881 A CN109596881 A CN 109596881A CN 201811496835 A CN201811496835 A CN 201811496835A CN 109596881 A CN109596881 A CN 109596881A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
Abstract
The invention discloses a kind of alternating voltage sampling circuits, comprising: voltage dividing resistance circuit, ADC sampling module and impedance matching circuit, voltage dividing resistance circuit are connect with alternating-current voltage source, for dividing to alternating-current voltage source, generate predeterminated voltage value signal；Voltage dividing resistance circuit includes the high resistance that multichannel is greater than preset value, and the line attachment of alternating-current voltage source is correspondingly connected with the multichannel high resistance of voltage dividing resistance circuit；ADC sampling module, for sampling predeterminated voltage value signal；Impedance matching circuit, it is connected respectively with voltage dividing resistance circuit and institute's ADC sampling module, impedance for impedance and ADC sampling module to voltage dividing resistance circuit carries out adaptation and strong and weak electricity is isolated by voltage dividing resistance circuit, simpler using Phototube Coupling or Magnetic isolation design compared to the prior art, cost is lower；High resistant isolation is carried out in voltage sampling circuit link simultaneously, enables to subsequent conditioning circuit to become light current, the subsequent conditioning circuit part without that can touch to people is isolated, and reduces isolation cost.
Description
Technical field
The present invention relates to alternating voltage sampling Design fields, and in particular to a kind of alternating voltage sampling circuit and system.
Background technique
General industry control system had not only included vulnerabilities scan part, but also including heavy-current control part, in order to make neck both protect
Control signal contact is held, again according to the connection of electrical aspect, needs to carry out light current and forceful electric power isolation, progress power is electrically separated to be
Not only system the operation is stable, but also the important measures of protection equipment and operator's safety had been guaranteed.Photoelectricity is generallyd use in the prior art
Isolation, pulse transformer or Magnetic isolation, the complex and higher cost of this design.
Summary of the invention
Therefore, the present invention provides a kind of alternating voltage sampling circuit and system, overcomes in the prior art to forceful electric power and weak
Deficiency at high cost is isolated into electrical row for electrical environment.
In a first aspect, the embodiment of the invention provides a kind of alternating voltage sampling circuits, comprising: voltage dividing resistance circuit, with
Alternating-current voltage source connection generates predeterminated voltage value signal for dividing to the alternating-current voltage source；The divider resistance electricity
Road includes the high resistance that multichannel is greater than preset value, and the line attachment of the alternating-current voltage source is correspondingly connected with the voltage dividing resistance circuit
Multichannel high resistance；ADC sampling module, for sampling the predeterminated voltage value signal；Impedance matching circuit, respectively with described point
Piezoelectricity resistance circuit and the ADC sampling module are connected, for the voltage dividing resistance circuit impedance and the ADC sample mould
The impedance of block is adapted to.
In one embodiment, above-mentioned alternating voltage sampling circuit, further includes: analog switch selection circuit is connected to institute
It states between voltage dividing resistance circuit and the impedance matching circuit, for selecting the ADC sampling module to sample the predeterminated voltage
The sampling channel of value signal.
In one embodiment, corresponding to adjust the analog switch choosing when the electric current of the alternating-current voltage source accesses reverse phase
Select the sampling channel reverse phase of circuit.
In one embodiment, when the alternating-current voltage source switches between three-phase and four-line formula and phase three-wire three formula, pass through
The analog switch selection circuit selects sampling channel.
In one embodiment, the analog switch selection circuit includes: eight to select an analog switch chip.
In one embodiment, the alternating voltage sampling circuit, further includes: benchmark raises circuit, is used for default electricity
Negative signal in pressure signal is converted into positive signal.
In one embodiment, the high resistance that the multichannel is greater than preset value is composed in series by multiple resistance respectively.
In one embodiment, the multichannel is greater than the high resistance of preset value further include: filter circuit, the filter circuit point
The high resistance that the road Bie Yuge is greater than preset value connects.
In one embodiment, the impedance matching circuit includes: amplifier follower, for the predeterminated voltage value signal
It is followed, exports the impedance being adapted to the ADC sampling module.
In one embodiment, it includes: current-limiting resistance, a reference source load resistance, reference voltage core that the benchmark, which raises circuit,
Piece and filter capacitor, the current-limiting resistance are connect with the reference voltage chip and the filter capacitor respectively, a reference source
Load resistance is connected in parallel with the filter capacitor.
Second aspect, the embodiment of the present invention also provide a kind of alternating voltage sampling system, comprising: processor and above-mentioned friendship
Voltage sampling circuit is flowed, alternating voltage sampled signal is input in the processor by the alternating voltage sampling circuit, described
Processor calculates information about power, harmonic information or the electric energy letter of the alternating-current voltage source according to the alternating voltage sampled signal
Breath.
Technical solution of the present invention has the advantages that
1, a kind of alternating voltage sampling circuit provided in an embodiment of the present invention, by setting voltage dividing resistance circuit to strong and weak electricity
It is isolated, generallys use Phototube Coupling, pulse transformer or Magnetic isolation compared to the prior art, designs simpler, cost
It is lower；High resistant isolation is carried out in voltage sampling circuit link simultaneously, subsequent conditioning circuit is enabled to become light current, without can be with to people
The subsequent conditioning circuit part touched is isolated, and isolation cost is reduced.
2, a kind of alternating voltage sampling circuit provided in an embodiment of the present invention is made by the way that analog switch selection circuit is arranged
It obtains and does not need thread-changing when alternating-current voltage source switches between three-phase and four-line formula and phase three-wire three formula, it is only necessary to pass through analog switch
Selection circuit selects sampling channel.In addition corresponding to adjust the analog switch choosing when the electric current of alternating-current voltage source accesses reverse phase
The sampling channel reverse phase of circuit is selected, so that the power calculated is exactly correct, it is ensured that electric current access is nonpolarity, convenient
Terminal block.
3, a kind of alternating voltage sampling circuit provided in an embodiment of the present invention, when ADC sampling module cannot acquire negative signal
When, circuit is raised by benchmark, the negative signal in voltage signal is converted into positive signal.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the composition figure of a specific example of alternating voltage sampling circuit provided in an embodiment of the present invention；
Fig. 2 is the specific example that alternating-current voltage source wiring provided in an embodiment of the present invention is included in voltage dividing resistance circuit
Schematic diagram；
Fig. 3 is another specific example that alternating-current voltage source wiring provided in an embodiment of the present invention is included in voltage dividing resistance circuit
Schematic diagram；
Fig. 4 A is the schematic diagram of a specific example of impedance matching circuit provided in an embodiment of the present invention；
Fig. 4 B is the schematic diagram of a specific example of impedance matching circuit provided in an embodiment of the present invention；
Fig. 5 is the composition figure of another specific example of alternating voltage sampling circuit provided in an embodiment of the present invention；
Fig. 6 is a specific example figure of analog switch selection circuit provided in an embodiment of the present invention；
Fig. 7 is another specific example figure of analog switch selection circuit provided in an embodiment of the present invention；
Fig. 8 is the composition figure of another specific example of alternating voltage sampling circuit provided in an embodiment of the present invention；
Fig. 9 is the specific example figure that benchmark provided in an embodiment of the present invention raises circuit.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
As long as in addition, the non-structure each other of technical characteristic involved in invention described below different embodiments
It can be combined with each other at conflict.
Embodiment 1
The embodiment of the present invention provides a kind of alternating voltage sampling circuit, as shown in Figure 1, comprising: voltage dividing resistance circuit 1, with
Alternating-current voltage source connection generates predeterminated voltage value signal for dividing to alternating-current voltage source；Voltage dividing resistance circuit 1 includes
Multichannel is greater than the high resistance of preset value, and the line attachment of alternating-current voltage source is correspondingly connected with the multichannel high resistance of voltage dividing resistance circuit 1；
ADC sampling module 3, for sampling predeterminated voltage value signal；Impedance matching circuit 2 is adopted with voltage dividing resistance circuit 1 and ADC respectively
Egf block 3 is connected, and the impedance for impedance and ADC sampling module 3 to voltage dividing resistance circuit 1 is adapted to.
In embodiments of the present invention, alternating-current voltage source can be power grid, as shown in Fig. 2, power grid output can be three-phase four
Wire type has UA, UB, UC, the output of tetra- line voltage of UN；It may be phase three-wire three formula, there is UA, the output of tri- line voltage of UB, UC.Partial pressure
The determination of the road the multichannel high resistance Zhong Mei high resistance resistance value of resistance circuit 1, can be to be safe from danger when people or other animal contacts
For according to determining.The high-resistance resistance value in the road Zhong Mei of the embodiment of the present invention can be 5M Ω, but be not limited.
In embodiments of the present invention, as shown in Figures 2 and 3, multichannel is greater than the high resistance of preset value respectively by multiple resistance
It is composed in series, the high resistance that multichannel is greater than preset value may also include that filter circuit, filter circuit are greater than preset value with each road respectively
High resistance connection, the filter circuit in the present embodiment is filter capacitor, such as C135, C139, C145, C147 in Fig. 2, or such as
C124, C126, C129, C131 in Fig. 3.In embodiments of the present invention, as shown in Figures 2 and 3, each of alternating-current voltage source connects
Line is connected the divider resistance branch in voltage dividing resistance circuit:
1st road three-phase voltage A is connected R239, the divider resistance branch of R240, R242 composition；
1st road three-phase voltage B is connected R252, the divider resistance branch of R253, R255 composition；
1st road three-phase voltage C is connected R265, the divider resistance branch of R266, R268 composition；
1st road three-phase voltage N is connected R272, the divider resistance branch of R273, R275 composition；
2nd road three-phase voltage A is connected R203, the divider resistance branch of R204, R205 composition；
2nd road three-phase voltage B is connected R213, the divider resistance branch of R214, R216 composition；
2nd road three-phase voltage C is connected R226, the divider resistance branch of R227, R229 composition；
2nd road three-phase voltage N is connected R233, the divider resistance branch of R234, R235 composition.In the embodiment of the present invention
ADC sampling module 3 can be the ADC sampling module in Micro-processor MCV, or individual ADC sampling module, according to
Actual requirement of engineering is rationally arranged.
Impedance matching circuit 2 in the embodiment of the present invention uses amplifier follower, makes output impedance very little, reaches ohm
Rank, therefore can connect the lesser ADC sampling module 3 of impedance, the impedance and ADC sampling module 3 to voltage dividing resistance circuit 1
Impedance is adapted to, and the amplifier chip U104 (only being illustrated with this, be not limited) e.g. in Fig. 4 A and Fig. 4 B utilizes two
Amplifier chip plays impedance matching and uses for following to voltage signal.
Alternating voltage sampling circuit provided in an embodiment of the present invention, by setting voltage dividing resistance circuit to strong and weak electricity carry out every
From, not only guaranteed system the operation is stable, but also protection equipment and operator's safety, generally use compared to the prior art photoelectricity every
From, pulse transformer or Magnetic isolation, not only design simpler, cost is also lower；It is carried out simultaneously in voltage sampling circuit link
High resistant isolation, enables to subsequent conditioning circuit to become light current, the subsequent conditioning circuit part without that can touch to people is isolated, and subtracts
Isolation cost is lacked.
In a preferred embodiment, as shown in figure 5, above-mentioned alternating voltage sampling circuit further include: analog switch selection electricity
Road 4 is connected between voltage dividing resistance circuit 1 and impedance matching circuit 2, for selecting ADC sampling module 3 to sample preset voltage value
The sampling channel of signal.
In embodiments of the present invention, it when the sampling channel of ADC sampling module 3 is less, when not being able to satisfy requirement of engineering, utilizes
Analog switch selection circuit 4 can provide more sampling channels for ADC sampling module 3.
In one embodiment, analog switch selection circuit 4 can select an analog switch chip for eight.E.g. Fig. 6
Shown in U108 and U105 shown in Fig. 7.
In embodiments of the present invention, it when alternating-current voltage source switches between three-phase and four-line formula and phase three-wire three formula, is not required to
Want thread-changing, it is only necessary to which sampling channel is selected by analog switch selection circuit 4.Such as: it is used in the 1st road voltage three-phase and four-line
Voltage sample scene:
When sampling the voltage between UA1 and UN1, the channel X3 (12 pin) and the X of U108 are controlled by Micro-processor MCV
Channel (No. 3 pins) conducting controls the channel X0 (13 house keeper) and X passage (No. 3 pins) conducting of U105, passes through impedance matching electricity
ADC sampling module 3 behind road 2 to difference is sampled, and digital signal is converted into, then subsequent is handled.
When sampling the voltage between UB1 and UN1, the channel X3 (12 pin) and the X of U108 are controlled by Micro-processor MCV
Channel (No. 3 pins) conducting controls the channel X1 (14 house keeper) and X passage (No. 3 pins) conducting of U105, passes through impedance matching electricity
ADC sampling module 3 behind road 2 to difference is sampled, and digital signal is converted into, then subsequent is handled.
When sampling the voltage between UC1 and UN1, the channel X3 (12 pin) and the X of U108 are controlled by Micro-processor MCV
Channel (No. 3 pins) conducting controls the channel X2 (15 house keeper) and X passage (No. 3 pins) conducting of U105, passes through impedance matching electricity
ADC sampling module 3 behind road 2 to difference is sampled, and digital signal is converted into, then subsequent is handled.
In another example being used in the voltage sample scene of the 1st road voltage phase three-wire three:
When sampling the voltage between UA1 and UB1, the channel X1 (14 pin) and the X of U108 are controlled by Micro-processor MCV
Channel (No. 3 pins) conducting controls the channel X0 (13 house keeper) and X passage (No. 3 pins) conducting of U105, passes through impedance matching electricity
It is sampled behind road 2 to the sampling module of difference 3, is converted into digital signal, then subsequent handled.
When sampling the voltage between UB1 and UC1, the channel X2 (15 pin) and the X of U108 are controlled by Micro-processor MCV
Channel (No. 3 pins) conducting controls the channel X1 (14 house keeper) and X passage (No. 3 pins) conducting of U105, passes through impedance matching electricity
ADC sampling module 3 behind road 2 to difference is sampled, and digital signal is converted into, then subsequent is handled.
When sampling the voltage between UC1 and UA1, the channel X0 (13 pin) and the X of U108 are controlled by Micro-processor MCV
Channel (No. 3 pins) conducting controls the channel X2 (15 house keeper) and X passage (No. 3 pins) conducting of U105, passes through impedance matching electricity
ADC sampling module 3 behind road 2 to difference is sampled, and digital signal is converted into, then subsequent is handled.
Therefore, by the selection in analog switch channel, in the case where not changing external cabling, the electricity under both of which
Pressure is acquired.In one embodiment cooperate electric current ADC sampled data, can be calculated voltage, circuit, power,
Electric energy, harmonic data.In the present embodiment, there is two-way voltage input, it can be with the corresponding voltage of combination current when calculating electric energy
Channel is calculated.
When the electric current of alternating-current voltage source accesses reverse phase, the power calculated is also reversely, in the present embodiment, to correspond to
The sampling channel reverse phase of the analog switch selection circuit is adjusted, the power calculated in this way is exactly correct.Such as A phase electricity
It after galvanic electricity stream is reversed, is connected by adjusting the channel X0 of U108 and X passage, the channel X3 of U105 and X passage conducting, it can make
Voltage sample channel is reversed, it is ensured that electric current access is nonpolarity, facilitates terminal block.
In a preferred embodiment, as shown in figure 8, above-mentioned alternating voltage sampling circuit, further includes: benchmark raises circuit 5,
For the negative signal in predeterminated voltage signal to be converted into positive signal.
In one embodiment, if ADC sampling module 3 cannot acquire negative signal, can alternating-current voltage source into
After row series connection voltage dividing resistance circuit 1 is divided, circuit 6 is raised using benchmark and raises signal voltage, negative signal is become just to believe
It is sampled after number to ADC sampling module 3.
In the present embodiment, as shown in figure 9, it includes: current-limiting resistance R112, a reference source load resistance that benchmark, which raises circuit 6,
R118, reference voltage chip U103 and filter capacitor C122, C125, current-limiting resistance R112 respectively with reference voltage chip U103 and
Filter capacitor C122, C125 connection, a reference source load resistance R118 are connected in parallel with filter capacitor.Correspondingly at above-mentioned point
Piezoelectricity resistance circuit 1 further include: partial pressure sampling resistor is connected in series, such as resistance shown in Fig. 2 with above-mentioned divider resistance branch
R116, R117, R120, R121, and resistance R101, R102, R109, R111 as shown in Figure 3, for example, collection voltages UAB
When: R116 and R239, R240, R242 and R117 and R252, R253, R255 form sampling network, between R116 and R117
A differential voltage REFO_U is generated, circuit 6 is raised with benchmark and is connected, and then negative voltage signal is become into positive voltage signal.
Alternating voltage sampling circuit provided in an embodiment of the present invention, by setting voltage dividing resistance circuit to strong and weak electricity carry out every
From, not only guaranteed system the operation is stable, but also protection equipment and operator's safety, generally use compared to the prior art photoelectricity every
From, pulse transformer or Magnetic isolation, it is related to simpler, cost is lower；High-barrier is carried out in voltage sampling circuit link simultaneously
From, enable to subsequent conditioning circuit to become light current, the subsequent conditioning circuit part without that can touch to people is isolated, reduce every
From cost.By the way that analog switch selection circuit is arranged, so that in alternating-current voltage source between three-phase and four-line formula and phase three-wire three formula
Thread-changing is not needed when switching, it is only necessary to which sampling channel is selected by analog switch selection circuit.In addition when the electricity of alternating-current voltage source
When stream access reverse phase, the corresponding sampling channel reverse phase for adjusting the analog switch selection circuit, so that the power calculated is just
It is correct, it is ensured that electric current access is nonpolarity, facilitates terminal block.When ADC sampling module cannot acquire negative signal,
Circuit is raised by benchmark, the negative signal in voltage signal is converted into positive signal.
Also a kind of alternating voltage sampling system of the embodiment of the present invention, comprising: processor and above-mentioned alternating voltage sampling electricity
Alternating voltage sampled signal is input in processor by road, alternating voltage sampling circuit, and processor is sampled according to alternating voltage to be believed
Number calculate alternating-current voltage source information about power, harmonic information or energy information.It in one embodiment, can be by alternating voltage
Sampled signal calculates information about power or harmonic information by root-mean-square valve method, cooperates current sampling circuit, can calculate electric energy letter
Breath.
Alternating voltage sampling system provided in an embodiment of the present invention utilizes the divider resistance electricity in alternating voltage sampling circuit
Strong and weak electricity is isolated in road, has not only guaranteed system the operation is stable, but also protection equipment and operator's safety, compared to the prior art
Phototube Coupling, pulse transformer or Magnetic isolation are generallyd use, is related to more simply, cost is lower；In voltage sampling circuit link
High resistant isolation is carried out in voltage sampling circuit link simultaneously with regard to carrying out high resistant isolation, subsequent conditioning circuit is enabled to become light current, nothing
The subsequent conditioning circuit part that need to can be touched to people is isolated, and reduces isolation cost.Electricity is selected by setting analog switch
Road, so that not needing thread-changing when alternating-current voltage source switches between three-phase and four-line formula and phase three-wire three formula, it is only necessary to pass through mould
Quasi- switch selection circuit selects sampling channel.In addition corresponding to adjust the simulation when the electric current of alternating-current voltage source accesses reverse phase
The sampling channel reverse phase of switch selection circuit, so that the power calculated is exactly correct, it is ensured that electric current access is electrodeless
Property, facilitate terminal block.When ADC sampling module cannot acquire negative signal, circuit is raised by benchmark, it will be in voltage signal
Negative signal be converted into positive signal, and then the information about power of alternating-current voltage source is calculated according to alternating voltage sampled signal, harmonic wave is believed
Breath or energy information.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And thus amplify out it is obvious variation or
It changes still within the protection scope of the invention.
Claims (11)
1. a kind of alternating voltage sampling circuit characterized by comprising
Voltage dividing resistance circuit is connect with alternating-current voltage source, for dividing to the alternating-current voltage source, generates preset voltage value
Signal；The voltage dividing resistance circuit includes the high resistance that multichannel is greater than preset value, and the line attachment of the alternating-current voltage source is corresponding
Connect the multichannel high resistance of the voltage dividing resistance circuit；
ADC sampling module, for sampling the predeterminated voltage value signal；
Impedance matching circuit is connected with the voltage dividing resistance circuit and the ADC sampling module respectively, for the partial pressure
The impedance of resistance circuit and the impedance of the ADC sampling module are adapted to.
2. alternating voltage sampling circuit according to claim 1, which is characterized in that further include: analog switch selection circuit,
It is connected between the voltage dividing resistance circuit and the impedance matching circuit, for selecting described in the ADC sampling module sampling
The sampling channel of predeterminated voltage value signal.
3. alternating voltage sampling circuit according to claim 2, which is characterized in that when the electric current of the alternating-current voltage source connects
When entering reverse phase, the corresponding sampling channel reverse phase for adjusting the analog switch selection circuit.
4. alternating voltage sampling circuit according to claim 2, which is characterized in that when the alternating-current voltage source is in three-phase four
When switching between wire type and phase three-wire three formula, sampling channel is selected by the analog switch selection circuit.
5. alternating voltage sampling circuit according to claim 1 to 4, which is characterized in that the analog switch selection electricity
Road includes: eight to select an analog switch chip.
6. alternating voltage sampling circuit according to claim 1 or 2, which is characterized in that further include: benchmark raises circuit,
For the negative signal in predeterminated voltage signal to be converted into positive signal.
7. alternating voltage sampling circuit according to claim 1, which is characterized in that the multichannel is greater than the height electricity of preset value
Resistance is composed in series by multiple resistance respectively.
8. alternating voltage sampling circuit according to claim 7, which is characterized in that the multichannel is greater than the height electricity of preset value
Resistance further include: filter circuit, the high resistance that the filter circuit is greater than preset value with each road respectively are connect.
9. alternating voltage sampling circuit according to claim 1, which is characterized in that the impedance matching circuit includes: fortune
Follower is put, for following to the predeterminated voltage value signal, exports the impedance being adapted to the ADC sampling module.
10. alternating voltage sampling circuit according to claim 6, which is characterized in that it includes: limit that the benchmark, which raises circuit,
Leakage resistance, a reference source load resistance, reference voltage chip and filter capacitor, the current-limiting resistance respectively with the reference voltage core
Piece and filter capacitor connection, a reference source load resistance are connected in parallel with the filter capacitor.
11. a kind of alternating voltage sampling system characterized by comprising processor and as described in claim 1-10 is any
Alternating voltage sampled signal is input in the processor by alternating voltage sampling circuit, the alternating voltage sampling circuit, institute
Processor is stated to be believed according to information about power, harmonic information or the electric energy that the alternating voltage sampled signal calculates the alternating-current voltage source
Breath.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811496835.5A CN109596881A (en) | 2018-12-07 | 2018-12-07 | A kind of alternating voltage sampling circuit and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811496835.5A CN109596881A (en) | 2018-12-07 | 2018-12-07 | A kind of alternating voltage sampling circuit and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114137292A (en) * | 2021-10-08 | 2022-03-04 | 北京科益虹源光电技术有限公司 | Voltage sampling method and sampling circuit |
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| CN114137292B (en) * | 2021-10-08 | 2024-04-05 | 北京科益虹源光电技术有限公司 | Voltage sampling method and sampling circuit |
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Application publication date: 20190409 |