CN110707952A - Photovoltaic grid-connected inverter - Google Patents
Photovoltaic grid-connected inverter Download PDFInfo
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- CN110707952A CN110707952A CN201911070434.8A CN201911070434A CN110707952A CN 110707952 A CN110707952 A CN 110707952A CN 201911070434 A CN201911070434 A CN 201911070434A CN 110707952 A CN110707952 A CN 110707952A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention provides a photovoltaic grid-connected inverter, which is characterized in that different follow current loops are constructed, and common-mode voltage is clamped to a half of a direct-current bus through resistance voltage division, so that the system can realize disconnection between a photovoltaic array and a power grid in a follow current stage, the constant of the common-mode voltage is realized, common-mode leakage current is greatly inhibited, and the safety of the photovoltaic grid-connected inverter is improved.
Description
Technical Field
The invention relates to an inverter in the technical field, in particular to a photovoltaic grid-connected inverter.
Background
In the non-isolated photovoltaic grid-connected inverter, with the disappearance of the transformer, common-mode voltage interference can be generated in an inverter circuit without electrical isolation between the transformer and a power grid, so that common-mode leakage current exists between a photovoltaic power generation system and the ground, and great potential safety hazards can be brought to workers and equipment.
Disclosure of Invention
The invention solves the problems that: how to restrain the common mode current of the non-isolated photovoltaic grid-connected inverter.
In order to solve the above problems, the invention provides a photovoltaic grid-connected inverter, which comprises a DSP module and an inverter circuit, wherein the inverter circuit comprises a switching tube T1, a switching tube T2, a switching tube T3, a switching tube T4, a switching tube T5, a switching tube T6, a diode D1, a capacitor C1, a resistor R1, and a resistor R2; the positive electrode of the output end of the photovoltaic cell is connected with the negative electrode of the output end of the photovoltaic cell through a switch tube T5, a switch tube T1 and a switch tube T2 in sequence, the public ends of a switch tube T1 and a switch tube T5 are connected with the negative electrode of the output end of the photovoltaic cell through a switch tube T3, a switch tube T6 and a switch tube T4 in sequence, the public ends of a switch tube T1 and a switch tube T2, a switch tube T3 and a switch tube T6 are connected to a power grid through a filter circuit, and the public ends of a switch tube T6 and a switch tube T4 are connected with the public ends of a switch tube T1 and a switch tube T2 through the anode and the cathode of a diode D1; the positive electrode of the output end of the photovoltaic cell is also connected with the negative electrode of the photovoltaic cell through a capacitor C1, the positive electrode of the output end of the photovoltaic cell is also connected with the negative electrode of the photovoltaic cell through a resistor R1 and a resistor R2 in sequence, and the common end of the resistor R1 and the resistor R2 is also connected with the common end of a switch tube T1 and a switch tube T2; and the control ends of the switch tube T1, the switch tube T2, the switch tube T3, the switch tube T4, the switch tube T5 and the switch tube T6 are respectively connected with the DSP module.
Optionally, the photovoltaic grid-connected inverter further includes a driving circuit, and the driving circuit is connected between the DSP module and the control end of the switching tube T1, the switching tube T2, the switching tube T3, the switching tube T4, the switching tube T5, or the switching tube T6.
Optionally, the driving circuit includes a TLP250 chip, a resistor R3, a resistor R4 and a resistor R5, the PWM signal output by the DSP module is connected to pin No. 2 of the TLP250 chip, and pin No. 6 of the TLP250 chip is connected to pin No. 7 and outputs a driving signal through a resistor R4 to drive the switching tube.
Optionally, the driving circuit further includes a diode D2, the diode D2 is connected in parallel with the resistor R4, and a cathode of the diode D2 is connected to pins No. 6 and No. 7 of the TLP250 chip.
Optionally, the photovoltaic grid-connected inverter further includes a dc voltage detection circuit and a dc current detection circuit, and the output end of the photovoltaic cell is connected to the DSP module through the dc voltage detection circuit and the dc current detection circuit, respectively.
Optionally, the dc voltage detection circuit includes a voltage dividing circuit, a voltage follower and a clamp protection circuit, and the output end of the photovoltaic cell is connected to the DSP module sequentially through the voltage dividing circuit, the voltage follower and the clamp protection circuit.
Optionally, the photovoltaic grid-connected inverter further includes a zero-crossing detection circuit, and the output end current of the inverter circuit or the grid voltage is input to the DSP module through the zero-crossing detection circuit.
Compared with the prior art, the photovoltaic grid-connected inverter has the following advantages:
(1) according to the photovoltaic grid-connected inverter, different follow current loops are constructed, the common-mode voltage is clamped to one half of a direct-current bus through resistance voltage division, so that the system is disconnected from a photovoltaic array and a power grid in a follow current stage, the common-mode voltage is constant, common-mode leakage current is greatly restrained, and the safety of the photovoltaic grid-connected inverter is improved;
(2) the driving circuit comprises a diode D2, a diode D2 is connected with a resistor R4 in parallel, the cathode of the diode D2 is connected with pins No. 6 and No. 7 of the TLP250 chip, when the switching tube is turned off, the driving circuit outputs low level, because the voltage drop of the diode D2 is smaller than the voltage drop generated on the resistor R4 by the same driving turn-off current, the charges stored in the grid capacitance of the switching tube are quickly discharged through the diode D2, when the circuit is in overcurrent, the switching tube can be turned off quickly, the protection speed is higher, and the loss of the circuit is reduced.
Drawings
Fig. 1 is a structural block diagram of a photovoltaic grid-connected inverter according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an inverter circuit according to an embodiment of the invention;
FIG. 3 is a circuit diagram of a driving circuit according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of a DC voltage detection circuit according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a zero-crossing detection circuit according to an embodiment of the present invention.
Description of reference numerals:
10-an inverter circuit; 20-a filter circuit; 30-a voltage divider circuit; 40-a voltage follower; 50-clamp protection circuit.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1, which is a structural block diagram of a photovoltaic grid-connected inverter in this embodiment, the photovoltaic grid-connected inverter includes a DSP module and an inverter circuit 10, and as shown in fig. 2, the inverter circuit 10 includes a switching tube T1, a switching tube T2, a switching tube T3, a switching tube T4, a switching tube T5, a switching tube T6, a diode D1, a capacitor C1, a resistor R1, and a resistor R2; the positive electrode of the output end of the photovoltaic cell is connected with the negative electrode of the output end of the photovoltaic cell through a switch tube T5, a switch tube T1 and a switch tube T2 in sequence, the public ends of a switch tube T1 and a switch tube T5 are connected with the negative electrode of the output end of the photovoltaic cell through a switch tube T3, a switch tube T6 and a switch tube T4 in sequence, the public ends of a switch tube T1 and a switch tube T2, a switch tube T3 and a switch tube T6 are connected to a power grid through a filter circuit 20, and the public ends of a switch tube T6 and a switch tube T4 are connected with the public ends of a switch tube T1 and a switch tube T2 through the anode and the cathode of a diode D1; the positive electrode of the output end of the photovoltaic cell is also connected with the negative electrode of the photovoltaic cell through a capacitor C1, the positive electrode of the output end of the photovoltaic cell is also connected with the negative electrode of the photovoltaic cell through a resistor R1 and a resistor R2 in sequence, and the common end of the resistor R1 and the resistor R2 is also connected with the common end of a switch tube T1 and a switch tube T2; and the control ends of the switch tube T1, the switch tube T2, the switch tube T3, the switch tube T4, the switch tube T5 and the switch tube T6 are respectively connected with the DSP module.
The positive electrode of the output end of the photovoltaic cell is connected with the negative electrode of the output end of the photovoltaic cell through the collector and the emitter of the switching tube T5, the collector and the emitter of the switching tube T1, the collector and the emitter of the switching tube T2, the common end of the switching tube T1 and the switching tube T5 is connected with the negative electrode of the output end of the photovoltaic cell through the collector and the emitter of the switching tube T3, the collector and the emitter of the switching tube T6 and the collector and the emitter of the switching tube T4.
In this embodiment, the inverter circuit 10 operates as follows:
the first stage is as follows: the DSP module controls the switch tube T4, the switch tube T5 and the switch tube T6 to be conducted, the switch tube T1, the switch tube T2 and the switch tube T3 to be disconnected, the common-mode voltage of the inverter is 0.5Upv, and the Upv is the output voltage of the photovoltaic cell;
and a second stage: the switch tube T6 is switched on, the switch tube T1, the switch tube T2, the switch tube T3, the switch tube T5 and the switch tube T6 are switched off, the DSP module controls the inverter to be disconnected from a power grid, the stage is a follow current stage, follow current only flows through the switch tube T6 and the diode D1, and the common-mode voltage of the inverter is about 0.5 Upv;
and a third stage: the switch tube T2, the switch tube T3 and the switch tube T5 are conducted, the switch tube T1, the switch tube T4 and the switch tube T6 are disconnected, current flows through the switch tube T3, the switch tube T2 and the switch tube T5, and the common-mode voltage of the inverter is 0.5 Upv;
a fourth stage: the switch tube T3 and the switch tube T6 are conducted, the switch tube T1, the switch tube T2, the switch tube T4 and the switch tube T5 are disconnected, the DSP module controls the inverter to be disconnected from a power grid, the stage is a follow current stage, and the common-mode voltage of the inverter is about 0.5 Upv.
Due to the influence of charging and discharging of parasitic junction capacitance of the switching tube, the common-mode voltage of the inverter cannot be kept constant completely in a freewheeling stage. The inverter can theoretically ensure that the common-mode voltage is constant by constructing a new follow current loop, and the common-mode voltage of the system generates high-frequency pulsation during high-frequency charging and discharging due to the existence of parasitic junction capacitance of the switching tube. In this embodiment, the capacitor C1 is a dc bus capacitor, the dc bus is divided by serially connecting a voltage dividing resistor R1 and a resistor R2, and the voltage at the common end of the resistor R1 and the resistor R2 is equal to half of the voltage of the dc bus, so that the common-mode voltage is clamped to half of the voltage of the dc bus, and the common-mode voltage is constant at the freewheeling stage.
Therefore, according to the embodiment, different follow current loops are constructed, the common-mode voltage is clamped to a half of the direct-current bus through resistance voltage division, the system is enabled to disconnect the photovoltaic array from the power grid in the follow current stage, the constant of the common-mode voltage is achieved, the common-mode leakage current is greatly restrained, and the safety of the photovoltaic grid-connected inverter is improved.
Optionally, as shown in fig. 1, the photovoltaic grid-connected inverter further includes a driving circuit, and the driving circuit is connected between the DSP module and the control end of the switching tube T1, the switching tube T2, the switching tube T3, the switching tube T4, the switching tube T5, or the switching tube T6.
Specifically, as shown in fig. 3, the driving circuit includes a TLP250 chip, a resistor R3, a resistor R4 and a resistor R5, the PWM signal output by the DSP module is connected to pin No. 2 of the TLP250 chip, and pin No. 6 of the TLP250 chip is connected to pin No. 7 and outputs a driving signal through the resistor R4 to drive the switching tube.
In the inverter circuit 10, the switching tube is an MOS tube, the MOS tube belongs to a voltage-driven device, a capacitance between a gate and a source of the MOS tube is very large, an on-state voltage drop of the MOS tube and a switching performance of the MOS tube are both directly affected by the gate voltage, and if the gate voltage drops, an on-state loss of the switching tube increases, which increases an on-state time of the switching tube; if the grid voltage is increased, the on-time and on-state loss of the switch tube are reduced, but the off-time of the switch tube is increased, and if the circuit fails, the short-circuit current of the switch tube is rapidly increased. The driving pulse signal output by the DSP module cannot directly drive the MOS transistor in the inverter circuit 10.
In this embodiment, the TLP250 chip has an isolation function, the driving circuit has a simple structure and good stability, the PWM pulse output by the DSP module is connected to the pin No. 2 of the TLP250 chip after being acted by the current limiting resistor R3, and the pin No. 6 and the pin No. 7 of the TLP250 driving chip are connected to the MOS transistor after being acted by the current limiting resistor R4, so that the function of driving the MOS transistor can be completed.
Optionally, as shown in fig. 3, the driving circuit further includes a diode D2, the diode D2 is connected in parallel with the resistor R4, and a cathode of the diode D2 is connected to pins No. 6 and No. 7 of the TLP250 chip. When the switch tube is turned off, the driving circuit outputs a low level, and since the voltage drop of the diode D2 is smaller than the voltage drop generated on the resistor R4 by the same driving turn-off current, the charges stored in the gate capacitor of the switch tube are rapidly discharged through the diode D2. Thus, due to the action of the diode D2, the switching tube can be turned off quickly when the circuit is over-current in the embodiment, the protection speed is faster, and the loss of the circuit is reduced.
Optionally, as shown in fig. 1, the photovoltaic grid-connected inverter further includes a dc voltage detection circuit and a dc current detection circuit, and the output end of the photovoltaic cell is connected to the DSP module through the dc voltage detection circuit and the dc current detection circuit, respectively.
The direct current voltage detection circuit is used for detecting the output voltage of the photovoltaic cell, the direct current detection circuit is used for detecting the output current of the photovoltaic cell, and the maximum power point tracking and the input overvoltage and undervoltage protection can be realized by detecting the input voltage and current.
Specifically, as shown in fig. 4, the dc voltage detection circuit includes a voltage dividing circuit 30, a voltage follower 40 and a clamp protection circuit 50, and the output end of the photovoltaic cell is connected to the DSP module sequentially through the voltage dividing circuit 30, the voltage follower 40 and the clamp protection circuit 50.
The voltage dividing circuit 30 is used for converting the output voltage of the photovoltaic cell into a safe voltage input to the voltage follower 40, and the clamping protection circuit 50 is used for clamping the output voltage of the voltage follower 40 to 0-3.3V and providing the safe voltage input to an A/D conversion pin of the DSP module. The voltage divider circuit 30 divides the voltage through resistors, and the divided voltage is applied through two voltage followers 40, and then applied through a resistor R11 and a capacitor C4 and then sent to an a/D conversion pin of the DSP module. The two voltage followers 40 are mainly used to implement the a/D conversion unit of the DSP module with input and output impedance isolation.
The voltage divider 30 of the dc voltage detection circuit is replaced by a current hall sensor to obtain a dc current detection circuit, so that the dc current detection circuit also includes a voltage follower 40 and a clamp protection circuit 50, and the principle of the dc current detection circuit is basically the same as that of the dc voltage detection circuit.
Optionally, as shown in fig. 1, the photovoltaic grid-connected inverter further includes a zero-crossing detection circuit, and the output end current of the inverter circuit 10 or the grid voltage is input to the DSP module through the zero-crossing detection circuit.
Specifically, as shown in fig. 5, the zero-crossing detection circuit includes a voltage transformer, a current transformer, a diode D5, a diode D6, a resistor R12, a resistor R13, an operational amplifier U3, a resistor R14, a diode D7, and a diode D8, the current transformer is used for detecting grid-connected current, the voltage transformer is used for detecting grid voltage, and the input of the zero-crossing detection circuit is the secondary-side voltage of the current transformer or the voltage transformer. The diode D5 and the diode D6 have the amplitude limiting function, the maximum voltage of two ends is 0.7V, the middle level of the two diodes is connected to the ground, the input voltage range of the positive end and the negative end to the ground is-0.35V- +0.35V, and the input voltage range is amplified through an operational amplifier and then is sent to a capture pin of the DSP module through a clamping circuit. The zero-crossing detection circuit is used for carrying out zero-crossing detection on the grid-connected current and the power grid voltage, converting a value of a sinusoidal signal which is greater than zero into a high level, and converting a value of the sinusoidal signal which is less than zero into a low level, so that the grid-connected current and the power grid voltage are in the same frequency and phase.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.
Claims (7)
1. The photovoltaic grid-connected inverter comprises a DSP module and an inverter circuit (10), and is characterized in that the inverter circuit (10) comprises a switch tube T1, a switch tube T2, a switch tube T3, a switch tube T4, a switch tube T5, a switch tube T6, a diode D1, a capacitor C1, a resistor R1 and a resistor R2; the positive electrode of the output end of the photovoltaic cell is connected with the negative electrode of the output end of the photovoltaic cell through a switch tube T5, a switch tube T1 and a switch tube T2 in sequence, the public ends of a switch tube T1 and a switch tube T5 are connected with the negative electrode of the output end of the photovoltaic cell through a switch tube T3, a switch tube T6 and a switch tube T4 in sequence, the public ends of a switch tube T1 and a switch tube T2, a switch tube T3 and a switch tube T6 are connected to a power grid through a filter circuit (20), and the public ends of a switch tube T6 and a switch tube T4 are connected with the public ends of a switch tube T1 and a switch tube T2 through the anode and the cathode of a diode D1; the positive electrode of the output end of the photovoltaic cell is also connected with the negative electrode of the photovoltaic cell through a capacitor C1, the positive electrode of the output end of the photovoltaic cell is also connected with the negative electrode of the photovoltaic cell through a resistor R1 and a resistor R2 in sequence, and the common end of the resistor R1 and the resistor R2 is also connected with the common end of a switch tube T1 and a switch tube T2; and the control ends of the switch tube T1, the switch tube T2, the switch tube T3, the switch tube T4, the switch tube T5 and the switch tube T6 are respectively connected with the DSP module.
2. The photovoltaic grid-connected inverter according to claim 1, further comprising a driving circuit, wherein the driving circuit is connected between the DSP module and a control terminal of a switching tube T1, a switching tube T2, a switching tube T3, a switching tube T4, a switching tube T5 or a switching tube T6.
3. The pv grid-connected inverter according to claim 2, wherein the driving circuit includes a TLP250 chip, a resistor R3, a resistor R4 and a resistor R5, the PWM signal output by the DSP module is connected to pin No. 2 of the TLP250 chip, and pin No. 6 of the TLP250 chip is connected to pin No. 7 and outputs a driving signal through the resistor R4 to drive the switching tube.
4. The grid-connected photovoltaic inverter according to claim 3, wherein the driving circuit further comprises a diode D2, the diode D2 is connected in parallel with the resistor R4, and the cathode of the diode D2 is connected to pins No. 6 and No. 7 of the TLP250 chip.
5. The photovoltaic grid-connected inverter according to claim 1, further comprising a dc voltage detection circuit and a dc current detection circuit, wherein the output terminal of the photovoltaic cell is connected to the DSP module via the dc voltage detection circuit and the dc current detection circuit, respectively.
6. The pv grid-connected inverter according to claim 5, wherein the dc voltage detection circuit comprises a voltage divider circuit (30), a voltage follower (40) and a clamp protection circuit (50), and the output of the pv cell is connected to the DSP module via the voltage divider circuit (30), the voltage follower (40) and the clamp protection circuit (50) in sequence.
7. The grid-connected photovoltaic inverter according to claim 1, further comprising a zero-crossing detection circuit, wherein the output end current or the grid voltage of the inverter circuit (10) is input to the DSP module through the zero-crossing detection circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911070434.8A CN110707952A (en) | 2019-11-05 | 2019-11-05 | Photovoltaic grid-connected inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911070434.8A CN110707952A (en) | 2019-11-05 | 2019-11-05 | Photovoltaic grid-connected inverter |
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| CN110707952A true CN110707952A (en) | 2020-01-17 |
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Citations (3)
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| CN1713503A (en) * | 2004-06-25 | 2005-12-28 | Sma技术股份公司 | Method of converting a direct current voltage from a source of direct current voltage into a alternating current voltage |
| CN204858585U (en) * | 2015-07-07 | 2015-12-09 | 国家电网公司 | Grid -connected PV power generation facility based on many MOSFET manage dc -to -ac converter |
| CN205450081U (en) * | 2015-12-31 | 2016-08-10 | 天津朗誉科技发展有限公司 | High accuracy current -voltage gathers and data conversion circuit |
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2019
- 2019-11-05 CN CN201911070434.8A patent/CN110707952A/en active Pending
Patent Citations (3)
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|---|---|---|---|---|
| CN1713503A (en) * | 2004-06-25 | 2005-12-28 | Sma技术股份公司 | Method of converting a direct current voltage from a source of direct current voltage into a alternating current voltage |
| CN204858585U (en) * | 2015-07-07 | 2015-12-09 | 国家电网公司 | Grid -connected PV power generation facility based on many MOSFET manage dc -to -ac converter |
| CN205450081U (en) * | 2015-12-31 | 2016-08-10 | 天津朗誉科技发展有限公司 | High accuracy current -voltage gathers and data conversion circuit |
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Application publication date: 20200117 |