CN115313409A - Novel reactive power compensation system of electric power system - Google Patents
Novel reactive power compensation system of electric power system Download PDFInfo
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- CN115313409A CN115313409A CN202210981140.6A CN202210981140A CN115313409A CN 115313409 A CN115313409 A CN 115313409A CN 202210981140 A CN202210981140 A CN 202210981140A CN 115313409 A CN115313409 A CN 115313409A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/001—Measuring real or reactive component; Measuring apparent energy
- G01R21/003—Measuring reactive component
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The application relates to a novel reactive power compensation system of an electric power system, which comprises a detection circuit, an invalid power control circuit and a reactive power compensation circuit. This design's a novel electric power system reactive power compensation system, utilize the monitoring circuit to carry out the electric current of current monitoring current system, and carry out basic filtering to the monitoring data, reduce the influence of environment and circuit to the real data, transmit the monitoring current value for compensation control circuit again and carry out the current value analysis, utilize threshold value algorithm analysis to calculate and make the judgement to current reactive power compensation volume, and give accurate judgement, at last transmit the judgement data for reactive power compensation circuit, according to judging the data, produce the compensation value that positive or negative current comes the comprehensive current reactive power, guarantee that reactive power's compensation value is in appropriate within range.
Description
Technical Field
The application relates to the field of power and power compensation, in particular to a novel reactive power compensation system of a power system.
Background
The meaning of power consumption management is to provide stable power quality for the power consumption customer. Among them, voltage is one of the important indicators of power quality. Reactive power is an important factor influencing voltage quality, the voltage quality is inseparable from reactive power, and a voltage problem is essentially a reactive power problem. The method solves the problem of reactive compensation and has very important significance. At present, a mainstream reactive compensation controller adopts a current and voltage sampling mode to analyze the phase difference of current and voltage, and sets a switching strategy through logical operation product. In practical application, however, two-phase under-compensation or over-compensation exists, which finally causes voltage fluctuation of rear-end electric equipment, even generates over-current and burns out internal circuits. This design adopts a novel feedback circuit structure, can feed back the compensation effect, and then realizes accurate control, solves reactive compensation problem, improves power quality.
As shown in fig. 1, the power compensation circuit of the prior art has functions of filtering, protection, compensation, etc., but involves a transformer and an isolation circuit, so that the structure is large in size and is easily interfered.
As shown in fig. 2, the front end of the hall voltage sensor is adopted for the signal acquisition circuit of the power compensation network in the prior art, so that the detection is sensitive, but the detection range is narrow.
Disclosure of Invention
Technical problem (I)
1. The power compensation circuit in the prior art is large in size, high in cost and easy to interfere.
2. The power compensation circuit in the prior art has a small signal detection range and a narrow application field.
(II) technical scheme
To the technical problem, the application provides a novel electric power system reactive power compensation system, including detection circuitry, reactive power control circuit, the reactive power compensation circuit who connects gradually.
The detection circuit: the method mainly detects the current of the reactive power compensation value in the system work and transmits the monitoring value to the compensation control circuit. Firstly, current data of a reactive power compensation value monitoring point is transmitted into a circuit through an interface V1, and then a current stabilizing circuit is formed by a resistor R2-1 and a diode D5 to drive current at an inductor L2 of the monitoring point to be stably transmitted so as to prevent crosstalk. And the inductor L2 and the resistor R3 form a first group of data slow start. Meanwhile, the resistor R8, the field effect transistor Q4 and the capacitor C5 form a grid electrode of a driving circuit control field effect transistor, so that the driving circuit control field effect transistor works in a linear mode. The inductors L1 and R3-1 are used for inputting monitoring signals, and meanwhile the resistor R3-1 can convert a monitored current value into a voltage value to be further input into the field effect tube Q1-1. The clamping diode D4 protects the grid-source electrode of the MOS transistor Q5 from being broken down by high voltage; diode D2 can keep apart the anti-shake delay circuit that R7, C3 constitute after MOS pipe Q5 switches on the electric slope control circuit, even the monitoring signal of filtering direct current voltage is very little, also can obtain undistorted great output voltage, utilizes triode Q1, Q2, Q3 postcascade amplification output at last, through the difference of signal, for the circuit provides effective output signal, has reached the purpose of anti common mode interference simultaneously, guarantees the high-efficient stability of input signal and data.
The invalid power control circuit: and amplifying the monitored data and performing threshold algorithm feedback processing, calculating the efficiency of the current reactive power compensation value, judging to obtain a value of subsequent compensation, and transmitting the obtained judged value to the reactive power compensation module. The signal is coupled and input through a capacitor C8, and is subjected to first-step pressure value judgment processing through a grid electrode of an MOS (metal oxide semiconductor) tube Q8. If the amplified voltage value is still small and the field effect transistor cannot be started, the field effect transistor is judged to be environmental noise and invalid signals. Then the signal is input to an inverting terminal of the comparator U1, the resistor R22 and the capacitor C11 form an RC circuit, the resistor R21 pulls down an input signal of the inverting terminal to ensure the stable state of the signal, in addition, the signal is stored through the capacitor C10 to ensure that the signal does not suddenly change, the signal is fed back to the inverting terminal through the resistor R12 and the capacitor C6 and fed back to a same-phase terminal through the resistor R25 and the resistor R24, the comparator U1 compares the signal and feeds back and superposes an output signal, and the diode D7 and the diode D9 limit the voltage of the feedback signal.
The reactive compensation circuit: the reactive compensation module circuit mainly utilizes a signal amplifier and a voltage stabilizing diode to generate current corresponding to compensation power. The signal input is pulled up by R16, stored by a capacitor C9 and input to the base of the triode Q6 and the collector of the Q7, and the voltage stabilizing diode D8 provides a contrast voltage and generates corresponding current through the base of the triode Q7. And then, after the adjustment of the counter atmosphere U2, the stability is generated, and an accurate current value is input into the circuit. The circuit is realized to always work in the proper reactive power compensation value.
(III) advantageous effects
The utility model provides a novel electric power system reactive power compensation system, at first, the structure is succinct, the volume is light, and stability is strong, and secondly, the scope that the signal detected is big, and the practicality is strong, the problem of the reactive power compensation of having solved of very big degree simultaneously has improved power quality, also provides a new selection for solving the reactive power compensation.
Drawings
Fig. 1 is a prior art power compensation circuit.
Fig. 2 is a signal detection circuit of a prior art power compensation network.
Fig. 3 is a schematic diagram of a detection circuit of the present application.
Fig. 4 is a schematic diagram of the reactive power control circuit of the present application.
Fig. 5 is a schematic diagram of the reactive power compensation circuit of the present application.
Detailed Description
The present invention will be further described with reference to the following examples.
As shown in fig. 3, 4, and 5, the novel reactive power compensation system for an electric power system provided by the present application includes a detection circuit, an reactive power control circuit, and a reactive power compensation circuit, which are connected in sequence.
The detection circuit: the method mainly detects the current of the reactive power compensation value in the system work and transmits the monitoring value to the compensation control circuit. Firstly, current data of a reactive power compensation value monitoring point are transmitted into a circuit through an interface V1, then a current stabilizing circuit is formed by a resistor R2-1 and a diode D5, and current at an inductor L2 of the monitoring point is driven to be stably transmitted to prevent crosstalk. And the inductor L2 and the resistor R3 form a first group of data slow start. Meanwhile, the resistor R8, the field effect transistor Q4 and the capacitor C5 form a grid electrode of a driving circuit control field effect transistor, so that the driving circuit control field effect transistor works in a linear mode. The inductors L1 and R3-1 are used for inputting monitoring signals, and meanwhile, the resistor R3-1 can convert the monitored current value into a voltage value to be further input into the field effect tube Q1-1. The clamping diode D4 protects the grid-source electrode of the MOS transistor Q5 from being broken down by high voltage; diode D2 can keep apart the anti-shake delay circuit that R7, C3 constitute after MOS pipe Q5 switches on the electric slope control circuit, even the monitoring signal of filtering direct current voltage is very little, also can obtain undistorted great output voltage, utilizes triode Q1, Q2, Q3 postcascade amplification output at last, through the difference of signal, for the circuit provides effective output signal, has reached the purpose of anti common mode interference simultaneously, guarantees the high-efficient stability of input signal and data.
Specifically, the detection circuit comprises an input port V1, MOS transistors Q4 and Q1-1, inductors L1 and L2, a diode D5, a capacitor C5, resistors R1-1, R2, R3-1, R2-1, R8 and R9, wherein the input port V1 is respectively connected with one end of the resistor R2, one end of the resistor R1-1, one end of the resistor R2-1 and one end of the inductor L2, the other end of the resistor R2 is connected with a high level VCC, one end of the resistor R2-1 is connected with a grid electrode of the MOS transistor Q1-1, the other end of the resistor R1-1 is connected with a source end of the MOS transistor Q4, the other end of the inductor L2 is respectively connected with one end of the resistor R3 and one end of the resistor R3-1, the other end of the resistor R3 is connected with the high-level VCC, the other end of the resistor R3-1 is connected with one end of the inductor L1 and the drain end of the MOS tube Q1-1 respectively, one end of the diode D5 is connected with the grid electrode of the MOS tube Q1-1, the other end of the diode D5 is connected with the source end of the MOS tube Q4, one end of the resistor R8 is connected with the grid electrode of the MOS tube Q1-1, the other end of the resistor R8 is connected with the grid electrode of the MOS tube Q4, one end of the resistor R9 is connected with the grid electrode of the MOS tube Q1-1, the other end of the resistor R9 is connected with one end of the capacitor C5, the other end of the capacitor C5 is grounded, the drain end of the MOS tube Q4 is grounded, and the source end of the MOS tube Q1-1 is grounded. The detection circuit comprises an output port V2, an MOS tube Q1-1, a diode D6, triodes Q1, Q2 and Q3, capacitors C2 and C3, resistors R5, R4, R11 and R10, wherein the drain end of the MOS tube Q1-1 is connected with one end of the resistor R10, the other end of the resistor R10 is respectively connected with one end of the resistor R5, one end of the capacitor C3, the base of the triode Q2 and one end of the capacitor C2, the other end of the resistor R5 is connected with a high level VCC, the other end of the capacitor C2 is grounded, the other end of the capacitor C3 is grounded, the emitter of the triode Q2 is respectively connected with one end of the resistor R4, the base of the triode Q1 and the high level VCC, the other end of the resistor R4 is connected with the high level VCC, the collector of the triode Q2 is respectively connected with the anode of the diode D6 and the base of the triode Q3, the cathode of the diode D6 is grounded, the collector of the triode Q1 is connected with the high level VCC, the emitter of the triode Q1 is respectively connected with the emitter of the triode Q3, the other end of the resistor R11 is connected with the emitter of the triode Q3, the output port of the triode Q2 and the emitter of the triode Q3, the triode Q2 are connected with the emitter of the output port and the emitter of the triode Q2.
An invalid power control circuit: and amplifying the monitored data and performing threshold algorithm feedback processing, calculating the efficiency of the current reactive power compensation value, judging to obtain a value of subsequent compensation, and transmitting the obtained judged value to the reactive power compensation module. The signal is coupled and input through a capacitor C8, and is subjected to first-step pressure value judgment processing through a grid electrode of an MOS (metal oxide semiconductor) tube Q8. If the amplified voltage value is still small and the field effect transistor cannot be started, the field effect transistor is judged to be environmental noise and invalid signals. Then the signal is input to an inverting terminal of the comparator U1, the resistor R22 and the capacitor C11 form an RC circuit, the resistor R21 pulls down an input signal of the inverting terminal to ensure the stable state of the signal, in addition, the signal is stored through the capacitor C10 to ensure that the signal does not suddenly change, the signal is fed back to the inverting terminal through the resistor R12 and the capacitor C6 and fed back to a same-phase terminal through the resistor R25 and the resistor R24, the comparator U1 compares the signal and feeds back and superposes an output signal, and the diode D7 and the diode D9 limit the voltage of the feedback signal.
Specifically, the reactive power control circuit includes an input port V3, an amplifier U1, a MOS transistor Q8, capacitors C7, C8, and C11, and resistors R15, R17, R19, R20, and R22, where the input port V3 is connected to a negative electrode of the capacitor C8, a positive electrode of the capacitor C8 is connected to one end of the resistor R19 and a gate of the transistor Q8, another end of the resistor R19 is connected to one end of the resistor R17 and one end of the resistor R20, another end of the resistor R17 is connected to a high-level VCC, another end of the resistor R20 is grounded, one end of the resistor R15 is connected to a drain of the MOS transistor Q8, another end of the resistor R19 is connected to the high-level VCC, one end of the resistor R22 is connected to a source end of the MOS transistor Q8, another end of the resistor R22 is grounded, a positive electrode of the capacitor C11 is connected to a source end of the MOS transistor Q8, a negative electrode is grounded, a positive electrode of the capacitor C7 is connected to a drain of the MOS transistor Q8, and a negative electrode is connected to an interface No. 2 of the amplifier U1. The invalid power control circuit comprises an output port V4, an amplifier U1, diodes D7 and D9, capacitors C6 and C10 and resistors R12, R21, R24, R26 and R25, wherein an interface 2 of the amplifier U1 in the invalid power control circuit is respectively connected with one end of the resistor R21, one end of the capacitor C10 and one end of the capacitor C6, the other end of the resistor R21 is grounded, the other end of the capacitor C10 is grounded, the other end of the capacitor C6 is connected with one end of the resistor R12, the other end of the resistor R12 is respectively connected with an interface 4 of the amplifier U1, a cathode of the diode D7, one end of the resistor R25 and an anode of the diode D9, an anode of the diode D7 is respectively connected with the other end of the resistor R25, a cathode of the diode D9 and one end of the resistor R24, the other end of the resistor R24 is respectively connected with one end of the resistor R26 and an interface 1 of the amplifier U1, the other end of the resistor R26 is grounded, an interface 3 of the amplifier U1 is connected with a high-level VCC, an interface 5 of the amplifier U1 is grounded, and an interface 4 of the amplifier U1 is connected with an interface 4 of the output port of the amplifier U1.
The reactive compensation circuit: the reactive compensation module circuit mainly utilizes a signal amplifier and a voltage stabilizing diode to generate current corresponding to compensation power. The signal input is pulled up through R16, stored energy through a capacitor C9 and input to the base of the triode Q6 and the collector of the triode Q7, and a voltage stabilizing diode D8 provides contrast voltage and generates corresponding current through the base of the triode Q7. And then, after the adjustment of the counter atmosphere U2, the stability is generated, and an accurate current value is input into the circuit. The circuit is realized to always work in the proper reactive power compensation value.
Specifically, the reactive compensation circuit comprises an input port V5, an output port V6, an amplifier U2, triodes Q6 and Q7, a diode D8, resistors R14, R16, R23 and R1-2, and a capacitor C9, wherein the input port V5 in the reactive compensation circuit is respectively connected with one end of the resistor R16, the anode of the capacitor C9, the collector of the triode Q7 and the base of the triode Q6, the other end of the resistor R16 is connected with a high-level VCC, the cathode of the capacitor C9 is grounded, the collector of the triode Q6 is connected with the high-level VCC, the emitter of the triode Q6 is respectively connected with the interface No. 3 of the amplifier U2 and one end of the resistor R14, the other end of the resistor R14 is connected with an interface 4 of the amplifier U2, one end of the resistor R1-2 is connected with an interface 4 of the amplifier U2, the other end of the resistor R1-2 is connected with an interface 2 of the amplifier U2, the base of the triode Q7 is connected with an interface 1 of the amplifier U2, the collector of the triode Q7 is connected with the negative electrode of the diode D8, the positive electrode of the diode D8 is grounded, an interface 5 of the amplifier U2 is grounded, one end of the resistor R23 is connected with an interface 4 of the amplifier U2, the other end of the resistor R23 is grounded, and the output port V6 is connected with an interface 4 of the amplifier U2.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (5)
1. The utility model provides a novel electric power system reactive power compensation system, includes detection circuitry, reactive power control circuit, the reactive power compensation circuit that connects gradually, its characterized in that: the detection circuit comprises an input port V1, MOS tubes Q4 and Q1-1, inductors L1 and L2, a diode D5, a capacitor C5, resistors R1-1, R2, R3-1, R2-1, R8 and R9, wherein the input port V1 in the detection circuit is respectively connected with one end of the resistor R2, one end of the resistor R1-1, one end of the resistor R2-1 and one end of the inductor L2, the other end of the resistor R2 is connected with a high level VCC, one end of the resistor R2-1 is connected with a grid electrode of the MOS tube Q1-1, the other end of the resistor R1-1 is connected with a source end of the MOS tube Q4, the other end of the inductor L2 is respectively connected with one end of the resistor R3 and one end of the resistor R3-1, the other end of the resistor R3 is connected with the high-level VCC, the other end of the resistor R3-1 is connected with one end of the inductor L1 and the drain end of the MOS tube Q1-1 respectively, one end of the diode D5 is connected with the grid electrode of the MOS tube Q1-1, the other end of the diode D5 is connected with the source end of the MOS tube Q4, one end of the resistor R8 is connected with the grid electrode of the MOS tube Q1-1, the other end of the resistor R8 is connected with the grid electrode of the MOS tube Q4, one end of the resistor R9 is connected with the grid electrode of the MOS tube Q1-1, the other end of the resistor R9 is connected with one end of the capacitor C5, the other end of the capacitor C5 is grounded, the drain end of the MOS tube Q4 is grounded, and the source end of the MOS tube Q1-1 is grounded.
2. The novel reactive power compensation system for electric power system according to claim 1, wherein: the detection circuit comprises an output port V2, an MOS tube Q1-1, a diode D6, a triode Q1, a Q2, a Q3, a capacitor C2, a C3, a resistor R5, a R4, a R11 and a R10, wherein the drain end of the MOS tube Q1-1 in the detection circuit is connected with one end of the resistor R10, the other end of the resistor R10 is respectively connected with one end of the resistor R5, one end of the capacitor C3, the base of the triode Q2 and one end of the capacitor C2, the other end of the resistor R5 is connected with a high level VCC, the other end of the capacitor C2 is grounded, the other end of the capacitor C3 is grounded, the emitter of the triode Q2 is respectively connected with one end of the resistor R4, the base of the triode Q1 and the high level VCC, the other end of the resistor R4 is connected with the high level VCC, the collector of the triode Q2 is respectively connected with the anode of the diode D6 and the base of the triode Q3, the cathode of the diode D6 is grounded, the collector of the triode Q1 is connected with the high level, the emitter of the triode Q1 is respectively connected with the VCC, one end of the emitter of the output port of the resistor R11 and the emitter of the triode Q3 are connected with the emitter of the output port of the triode Q2.
3. The novel reactive power compensation system for electric power system according to claim 1, wherein: the reactive power control circuit comprises an input port V3, an amplifier U1, an MOS tube Q8, capacitors C7, C8 and C11, resistors R15, R17, R19, R20 and R22, wherein the input port V3 is connected with the negative pole of the capacitor C8 in the reactive power control circuit, the positive pole of the capacitor C8 is respectively connected with one end of the resistor R19 and the grid of the triode Q8, the other end of the resistor R19 is respectively connected with one end of the resistor R17 and one end of the resistor R20, the other end of the resistor R17 is connected with a high-level VCC, the other end of the resistor R20 is grounded, one end of the resistor R15 is connected with the drain end of the MOS tube Q8, the other end of the resistor R19 is connected with the high-level VCC, one end of the resistor R22 is connected with the source end of the MOS tube Q8, the other end of the resistor R11 is grounded, the positive pole of the capacitor C11 is connected with the source end of the MOS tube Q8, the negative pole of the capacitor C7 is grounded, the positive pole of the capacitor C7 is connected with the drain end of the MOS tube Q8, and the negative pole of the amplifier U1 is connected with an interface No. 2.
4. The novel reactive power compensation system for electric power system according to claim 1, wherein: the reactive power control circuit comprises an output port V4, an amplifier U1, diodes D7 and D9, capacitors C6 and C10 and resistors R12, R21, R24, R26 and R25, wherein an interface No. 2 of the amplifier U1 in the reactive power control circuit is respectively connected with one end of the resistor R21, one end of the capacitor C10 and one end of the capacitor C6, the other end of the resistor R21 is grounded, the other end of the capacitor C10 is grounded, the other end of the capacitor C6 is connected with one end of the resistor R12, the other end of the resistor R12 is respectively connected with an interface No. 4 of the amplifier U1, a cathode of the diode D7, one end of the resistor R25 and an anode of the diode D9, an anode of the diode D7 is respectively connected with the other end of the resistor R25, a cathode of the diode D9 and one end of the resistor R24, the other end of the resistor R24 is respectively connected with one end of the resistor R26 and the interface No. 1 of the amplifier U1, the other end of the resistor R26 is grounded, an interface No. 3 of the amplifier U1 is connected with a high level VCC, an interface of the amplifier U1 is connected with a ground, and an interface No. 4 of the output port of the amplifier U1 is connected with an interface of the output port of the amplifier U1.
5. The novel reactive power compensation system for electric power system according to claim 1, wherein: the reactive compensation circuit comprises an input port V5, an output port V6, an amplifier U2, a triode Q6, a Q7, a diode D8, a resistor R14, a resistor R16, an output port V23, an amplifier R1-2 and a capacitor C9, wherein the input port V5 in the reactive compensation circuit is respectively connected with one end of the resistor R16, the anode of the capacitor C9, the collector of the triode Q7 and the base of the triode Q6, the other end of the resistor R16 is connected with a high-level VCC, the cathode of the capacitor C9 is grounded, the collector of the triode Q6 is connected with the high-level VCC, the emitter of the triode Q6 is respectively connected with the interface No. 3 of the amplifier U2 and one end of the resistor R14, the interface No. 4 of the amplifier U2 at the other end of the resistor R14 is connected with the interface No. 4 of the amplifier U2, one end of the resistor R1-2 is connected with the interface No. 2 of the amplifier U2, the base of the triode Q7 is connected with the interface No. 1 of the amplifier U2, the collector of the triode Q7 is connected with the cathode of the diode D8, the anode of the amplifier D8, the amplifier U2 is grounded, the amplifier U5 is connected with the interface of the output port of the amplifier U2, the amplifier U2 is connected with the interface of the amplifier U2, and the interface of the amplifier U6, and the other end of the amplifier U6 are connected with the interface of the output port of the amplifier U6, and the interface of the amplifier U2, the interface of the amplifier U6.
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| CN115801042A (en) * | 2023-02-09 | 2023-03-14 | 西安集成电路设计专业孵化器有限公司 | Electric digital data transmission chip circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115801042A (en) * | 2023-02-09 | 2023-03-14 | 西安集成电路设计专业孵化器有限公司 | Electric digital data transmission chip circuit |
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