CN209787041U - Three-phase boost-buck PFC (power factor correction) rectification circuit - Google Patents
Three-phase boost-buck PFC (power factor correction) rectification circuit Download PDFInfo
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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
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Abstract
The utility model discloses a three-phase boost-buck PFC rectifier circuit, it includes three-phase voltage source circuit (1), three-phase uncontrollable rectifier circuit (2), boost-buck chopper circuit (3) and shunt circuit (4) of two symmetries. The utility model has the advantages that: (1) compared with a three-phase LC filtering passive power factor correction circuit, the power factor can reach 1.0, and the output voltage is controllable; (2) compared with the traditional boost PFC rectifying circuit, the boost PFC rectifying circuit can not only reduce the voltage output but also increase the voltage output under the condition without a post-stage voltage reduction circuit; (3) compared with a three-phase single-switch correcting circuit, the current control is simple, the inductive current works in a continuous mode, the input and output current ripples are small, only one inductor is needed, three-phase decoupling is not needed, and the control is simple; (4) compared with a three-phase multi-switch power factor correction circuit, the driving and control strategy is simple, the cost is saved, and the realization is convenient.
Description
Technical Field
The utility model belongs to the technical field of the power factor correction technique and specifically relates to a three-phase boost-buck PFC rectifier circuit.
Background
The Power Factor Correction technology (Power Factor Correction technology) is a basic technology in the Power electronics field and the industrial field, and is used for inhibiting harmonic pollution so as to reduce the harm of higher current harmonics to a Power grid and various electric equipment. With the increase of electric equipment, the requirements of high efficiency and high power factor are also put forward on the electric energy converter, so various novel PFC conversion topologies are generated.
At present, the research on single-phase power factor correction technology is more, and the research on circuit topology and control is quite mature, while the research on three-phase power factor correction is relatively late and less. In recent years, as the research on PFC technology is continuously and deeply carried out, three-phase PFC is increasingly attracting attention. The power factor correction technology is divided into passive power factor correction and active power factor correction. The passive power factor correction adopts a passive device, such as LC filtering, although the circuit structure is simple and the efficiency is high, the power factor is influenced by an inductance value, the maximum power factor can only reach 0.95, and the output voltage is uncontrollable, so the passive power factor correction is not adopted in most cases. The traditional three-phase active power factor correction circuit generally has the characteristic of a Boost circuit, and can ensure that higher direct current bus voltage is output while power factor correction is realized. For the occasion that the regulation range of the output voltage is required to be wide when the rectified output voltage is required to be boosted and reduced, a step-down chopper circuit needs to be connected at the rear stage of the traditional three-phase active power factor correction circuit. From the number of active power transistors used, three-phase PFCs can be divided into two categories, one being single-switch structures and one being multi-switch structures. In order to realize decoupling between three phases, three inductors are arranged on an alternating current test and work in a current discontinuous mode, and the three-phase single-switch Boost PFC circuit is characterized in that current control is simple, but input and output current ripples of the circuit are large, requirements on filter current are high, and output voltage is too high, so that certain difficulty is brought to selection of a power tube, and the circuit is generally applied to occasions with output power smaller than 10kw and low requirements on current THD. Although the three-phase multi-switch can control input current with higher precision and obtain excellent performance, the driving and control strategies are complex and the cost is higher.
Disclosure of Invention
An object of the utility model is to provide a three-phase boost-buck PFC rectifier circuit, this circuit structure is simple, adopts the mode of reposition of redundant personnel to realize three-phase power factor correction.
The utility model provides a three-phase boost-buck PFC rectification circuit, which comprises a three-phase voltage source circuit (1), a three-phase uncontrolled rectification circuit (2), two symmetrical boost-buck chopper circuits (3) and a shunt circuit (4); wherein the content of the first and second substances,
The three-phase voltage source (1) consists of A, B, C three sinusoidal voltage sources which form an angle of 120 degrees with each other, one end of A, B, C three-phase voltage source is connected together, and the other end is respectively connected with the three-phase uncontrolled rectifying circuit (2);
The three-phase uncontrolled rectifying circuit (2) is composed of a diode D1～D6Composition D of1And D2Are connected to form a first series circuit, D3And D4Are connected to form a second series circuit, D5And D6the cathodes of the three series circuits are connected with each other to form a third series circuit, the cathodes of the three series circuits are connected with the cathodes, the anodes of the three series circuits are connected with the anodes, the other end of the phase A voltage source is connected with the midpoint of the first series circuit, the other end of the phase B voltage source is connected with the midpoint of the second series circuit, and the other end of the phase C voltage source is connected with the midpoint of the third series circuit;
Two symmetrical buck-boost chopper circuits (3) are composed of power switching tubes Q1Power switch tube Q2Inductor L1Diode D7Diode D8And a capacitor C1Composition Q1、D7、L1、C1Form a first buck-boost chopper circuit, Q2、D8、L1、C1Form a second buck-boost chopper circuit, Q1The collector of the three-phase non-controlled rectifying circuit (2) is connected with the common cathode of the three-phase non-controlled rectifying circuit, Q1Emitter and D7Cathode, C1Are connected to one end of, Q2OfThe emitters are connected to the common anode of a three-phase non-controlled rectifier circuit (2), Q2Collector electrode of (2) and (D)8And C1Are connected at the other end, L1And one end of (D)7Is connected to the anode of L1Another end of (D) and8The cathodes of the two electrodes are connected;
The shunt circuit (4) is composed of a power switch tube Q3～Q14Composition of, wherein Q3Is connected to the midpoint of the first series circuit, Q3Collector and Q of4Are connected to the collector of, Q4Emitter and D7Are connected to the anode of Q5Is connected to the midpoint of the second series circuit, Q5Collector and Q of6Are connected to the collector of, Q6Emitter and D7Are connected to the anode of Q7Is connected to the midpoint of the third series circuit, Q7Collector and Q of8Are connected to the collector of, Q8Emitter and D7The anodes of the anode groups are connected; q9Is connected to the midpoint of the first series circuit, Q9Collector and Q of10Are connected to the collector of, Q10Emitter and D8Is connected to the cathode of, Q11Is connected to the midpoint of the second series circuit, Q11Collector and Q of12Are connected to the collector of, Q12Emitter and D8Is connected to the cathode of, Q13Is connected to the midpoint of the third series circuit, Q13Collector and Q of14Are connected to the collector of, Q14Emitter and D8Are connected to each other.
preferably, the power switch tube Q1～Q14Can be a MOSFET or an IGBT and are internally provided with anti-parallel diodes.
Preferably, the three-phase uncontrolled rectifying circuit also comprises an input filter, and the input filter is arranged at the front end of the three-phase uncontrolled rectifying circuit (2). And a power supply of the three-phase voltage source circuit is connected to the three-phase uncontrolled rectifying unit after being filtered by the input filter. What kind of wave filter does not influence the utility model discloses a theory of operation.
When the circuit realizes the step-down output function, if threeThe actual value corresponding to the maximum absolute value of the phase voltage is positive, and Q is controlled1The low-frequency component of the upper current follows the positive half cycle envelope line of the three-phase input voltage, and the control shunt circuit respectively enables the corresponding switch tube in the middle of the three-phase voltage actual value to selectively keep a normally-on state and the low-frequency component of the current on the corresponding switch tube with the minimum three-phase voltage actual value to follow the negative half cycle envelope line of the three-phase input voltage; if the actual value corresponding to the maximum absolute value of the three-phase voltage is negative, controlling Q2The low-frequency component of the upper current follows the negative half cycle envelope curve of the three-phase input voltage, and the shunt circuit is controlled to enable the low-frequency component of the current on the corresponding switch tube in the middle of the three-phase voltage actual value to selectively keep a normally-on state and the corresponding switch tube in the maximum three-phase voltage actual value to follow the positive half cycle envelope curve of the three-phase input voltage.
When the circuit realizes the boosting output function, the switch tube Q is kept1、Q2And normally breaking, controlling the shunt circuit, and realizing reasonable distribution of the inductive current in three phases under a stable state, thereby realizing three-phase power factor correction.
The utility model has the advantages that: (1) compared with a three-phase LC filtering passive power factor correction circuit, the power factor can reach 1.0, and the output voltage is controllable. (2) Compared with the traditional boost PFC rectifying circuit, the boost PFC rectifying circuit can be used for buck output without a post-stage buck circuit and can also be used for boost output. (3) Compared with a three-phase single-switch correction circuit, the current control is simple, the inductive current works in a continuous mode, the input and output current ripples are small, only one inductor is needed, three-phase decoupling is not needed, and the control is simple. (4) Compared with a three-phase multi-switch power factor correction circuit, the driving and control strategy is simple, the cost is saved, and the realization is convenient.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention (including reference numerals).
Fig. 2(a) is a schematic diagram illustrating simulation of a-phase input voltage and current according to the present invention.
fig. 2(B) is a schematic diagram illustrating simulation of the phase B input voltage and current according to the present invention.
Fig. 2(C) is a schematic diagram illustrating simulation of the C-phase input voltage and current according to the present invention.
FIG. 3(a) - (e) shows the grid voltage Ua>Ub>UcAnd when the voltage is reduced, the current loop mode of the voltage reduction output is realized.
Fig. 3(f) is a schematic diagram of driving waveforms of the switching tubes for realizing step-down output according to an embodiment of the present invention.
FIGS. 4(a) - (d) show the grid voltage Ua>Ub>UcIn the time, under a typical control mode, the utility model discloses realize the current loop mode of the output that steps up.
Fig. 4(e) is a schematic diagram of driving waveforms of the switching tubes of the boost output according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of the circuit structure of the present invention.
Detailed Description
To describe the present invention more specifically, the following detailed description will be given with reference to the accompanying drawings and the embodiments. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein like reference numerals refer to like parts, unless otherwise specified.
As shown in fig. 1, a three-phase boost-buck PFC rectifier circuit includes: the device comprises a three-phase voltage source circuit (1), a three-phase uncontrolled rectifying circuit (2), two symmetrical buck-boost chopper circuits (3) and a shunt circuit (4); the three-phase voltage source (1) consists of A, B, C three sinusoidal voltage sources which form an angle of 120 degrees with each other, one end of the A, B, C three-phase voltage source is connected together, and the other end of the A, B, C three-phase voltage source is respectively connected with the three-phase uncontrolled rectifying circuit (2); the three-phase uncontrolled rectifying circuit (2) is composed of a diode D1～D6Composition D of1And D2Are connected to form a first series circuit, D3And D4Are connected to form a second series circuit, D5And D6The cathodes of which are connected to form a third series circuit,The cathodes of the three series circuits are connected with the cathodes, the anodes of the three series circuits are connected with the anodes of the three series circuits to form a three-phase uncontrolled rectifying circuit (2), the other end of the A-phase voltage source is connected with the midpoint of the first series circuit, the other end of the B-phase voltage source is connected with the midpoint of the second series circuit, and the other end of the C-phase voltage source is connected with the midpoint of the third series circuit; two symmetrical buck-boost chopper circuits (3) are composed of power switching tubes Q1Power switch tube Q2Inductor L1Diode D7Diode D8And a capacitor C1Composition, power switch tube Q1Diode D7Inductor L1Capacitor C1Form a first buck-boost chopper circuit and a power switch tube Q2Diode D8Inductor L1Capacitor C1Form a second buck-boost chopper circuit, Q1The collector of the three-phase non-controlled rectifying circuit (2) is connected with the common cathode of the three-phase non-controlled rectifying circuit, Q1Emitter and D7Cathode, C1Are connected to one end of, Q2Is connected with the common anode of the three-phase uncontrolled rectifying circuit (2), Q2Collector electrode of (2) and (D)8And C1Are connected at the other end, L1And one end of (D)7Is connected to the anode of L1Another end of (D) and8The cathodes of the two electrodes are connected; the shunt circuit (4) is composed of a power switch tube Q3～Q14Composition of, wherein Q3Is connected to the midpoint of the first series circuit, Q3collector and Q of4Are connected to the collector of, Q4Emitter and D7Are connected to the anode of Q5Is connected to the midpoint of the second series circuit, Q5Collector and Q of6are connected to the collector of, Q6Emitter and D7Are connected to the anode of Q7Is connected to the midpoint of the third series circuit, Q7Collector and Q of8Are connected to the collector of, Q8Emitter and D7the anodes of the anode groups are connected; q9Is connected to the midpoint of the first series circuit, Q9Collector and Q of10Are connected to the collector of, Q10Emitter and D8Is connected to the cathode，Q11Is connected to the midpoint of the second series circuit, Q11Collector and Q of12Are connected to the collector of, Q12Emitter and D8Is connected to the cathode of, Q13Is connected to the midpoint of the third series circuit, Q13Collector and Q of14Are connected to the collector of, Q14Emitter and D8Are connected to each other. Power switch tube Q1～Q14Can be a MOSFET or an IGBT and both comprise anti-parallel diodes.
Fig. 1 shows that the three-phase boost-buck PFC rectifier circuit also comprises an input filter, the input filter is arranged at the front end of the three-phase uncontrolled rectifier circuit, and the output current of the rectifier bridge enters a power grid after being filtered by the filter. In other alternative embodiments of this embodiment, a filter may be added, which is consistent with the essence of the present invention.
In the step-down mode, the switch tube Q4、Q6、Q8、Q9、Q11、Q13And the diode is always in an off state, and only the corresponding anti-parallel diode can work in a switching state.
As shown in FIGS. 2 (a-c), FIG. 2(a) shows a three-phase input A-phase voltage UaAnd current iaFIG. 2(B) shows a three-phase input B-phase voltage UbAnd current ibFIG. 2(C) shows three-phase input C-phase voltage UcAnd a current ic. It can be seen from fig. 2 (a-c) that the three-phase current and the three-phase voltage are kept in the same phase, i.e. the power factor correction is realized. FIG. 3 (a-e) shows a typical control mode droop output, grid voltage Ua>Ub>UcThe circuit operates as a current loop. FIG. 4 (a-d) is a graph of boost output, grid voltage U, under a typical control regimea>Ub>UcThe circuit operates as a current loop.
One control mode for realizing buck output of the three-phase buck-boost PFC rectification circuit in the embodiment is as follows: when the network voltage Ua>0>Ub>UcIn the meantime, the system working modes are reasonably distributed and completed in the switching period by fig. 3(a), fig. 3(b) and fig. 3 (e). When the network voltage Ua>Ub>0>UcIn the meantime, the system working modes are reasonably distributed and completed in the switching period by fig. 3(c), fig. 3(d) and fig. 3 (e).
For simplicity of analysis, the three-phase grid voltage is considered to be symmetrical, and for other grid voltage conditions, those skilled in the art should understand a control manner for realizing the step-down output in the embodiment. Firstly, Q is judged and selected according to the sign of the product result of three-phase voltage values1Or Q2Performing high frequency PWM modulation, Q1Operating in a high frequency PWM modulated state Q2Off, Q3、Q5、Q7Selective high-frequency modulation, wherein in the three switching tubes, the switching tube corresponding to the middle of the actual value of the three-phase voltage is in a normally-on state; q2Operating in PWM modulation mode Q1Off, Q10、Q12、Q14And selective high-frequency modulation, wherein the corresponding switch tube in the middle of the three-phase voltage actual values is in a normally-on state. Due to the three-phase symmetry, then ia+ib+icand the absolute value of the phase current with different sign is equal to the sum of the absolute values of the phase currents with the same sign. By Ua>0>Ub>UcFor example analysis, the same phase is B phase and C phase, the different phase is A phase, and the product of three-phase voltage values is positive, Q is selected1Performing high frequency PWM modulation, Q2When the switch tube is disconnected, the corresponding switch tube with the same number is modulated reasonably at high frequency, and the corresponding switch tube B is Q5，Q5At this time, the switch tube corresponding to C is Q7，Q7Is a high frequency modulation. By Ua>Ub>0>UcFor example analysis, the same phase is A phase and B phase, the different phase is C phase, and the product of three-phase voltage values is negative, Q is selected2high-frequency PWM modulation, reasonable high-frequency modulation of corresponding switch tubes with the same number, and Q for corresponding switch tube A10，Q10For high frequency modulation, the corresponding switch tube of B is Q12，Q12This is normally on. The rest conditions are analyzed in the same way, and a detailed driving waveform schematic diagram of each switching tube corresponding to the function is shown in fig. 3 (f).
In this exampleThe other control mode for realizing boost output of the three-phase boost-buck PFC rectifying circuit is as follows: when the network voltage Ua>0>Ub>UcIn the meantime, the system working modes are reasonably distributed and completed in the switching period by fig. 4(a), fig. 4(b) and fig. 4 (d). When the network voltage Ua>Ub>0>UcIn the meantime, the system working modes are reasonably distributed and completed in the switching period by fig. 4(b), fig. 4(c) and fig. 4 (d). Q1And Q2And (5) normally breaking.
For simplicity of analysis, the three-phase grid voltage is considered to be symmetrical, and for other grid voltage situations, a person skilled in the art can understand a control mode for realizing boost output in the embodiment. According to the difference of the three-phase input voltage, working switching tubes are reasonably selected, the phase with the largest actual value of the three-phase input voltage and the phase with the smallest actual value of the three-phase input voltage are respectively subjected to PWM modulation, and the corresponding switching tubes in the actual value of the input voltage are kept in a normally-on state. By Ua>0>Ub>UcFor example analysis, the maximum phase of the three-phase input voltage is phase A, and the corresponding switching tube subjected to high-frequency PWM modulation is Q10The intermediate phase of the three-phase input voltage is a phase B, the phase B is a negative value, and the corresponding normally-on switching tube is Q5The minimum phase of the three-phase input voltage is C phase, and the corresponding high-frequency PWM modulated switching tube is Q7In the working mode, the other switching tubes are all in an off state. By Ua>Ub>0>UcFor example analysis, the maximum phase of the three-phase input voltage is phase A, and the corresponding PWM-modulated switch tube is Q10The intermediate phase of the three-phase input voltage is a phase B, the phase B is a positive value, and the corresponding normally-on switching tube is Q12The minimum phase of the three-phase input voltage is C phase, and the corresponding high-frequency PWM modulated switching tube is Q7In the working mode, the other switching tubes are all in an off state. The rest conditions are analyzed in the same way, and a detailed driving waveform schematic diagram of each switching tube corresponding to the function is shown in fig. 4 (e).
Simulation results show that the PFC circuit can enable the power factor to reach 1.0 when buck output or boost output is realized.
Those skilled in the art will recognize. Many variations on the above description are possible, so that the examples are only intended to describe one or more particular implementations.
The above description is only for the preferred embodiment of the present invention, and not for the limitation of the scope of the present invention, and the various modifications and improvements made by the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (3)
1. A three-phase boost-buck PFC rectification circuit is characterized by comprising a three-phase voltage source circuit (1), a three-phase uncontrolled rectification circuit (2), two symmetrical boost-buck chopper circuits (3) and a shunt circuit (4); wherein the content of the first and second substances,
The three-phase voltage source circuit (1) consists of A, B, C three sinusoidal voltage sources which form an angle of 120 degrees with each other, one end of A, B, C three-phase voltage source is connected together, and the other end is respectively connected with the three-phase uncontrolled rectifying circuit (2);
the three-phase uncontrolled rectifying circuit (2) is composed of a diode D1～D6Composition D of1And D2Are connected to form a first series circuit, D3And D4Are connected to form a second series circuit, D5And D6The cathodes of the three series circuits are connected with each other to form a third series circuit, the cathodes of the three series circuits are connected with the cathodes, the anodes of the three series circuits are connected with the anodes, the other end of the phase A voltage source is connected with the midpoint of the first series circuit, the other end of the phase B voltage source is connected with the midpoint of the second series circuit, and the other end of the phase C voltage source is connected with the midpoint of the third series circuit;
Two symmetrical buck-boost chopper circuits (3) are composed of power switching tubes Q1Power switch tube Q2Inductor L1Diode D7Diode D8And a capacitor C1Composition Q1、D7、L1、C1Form a first buck-boost chopper circuit, Q2、D8、L1、C1Form the second literStep-down chopper circuit, Q1The collector of the three-phase non-controlled rectifying circuit (2) is connected with the common cathode of the three-phase non-controlled rectifying circuit, Q1Emitter and D7Cathode, C1Are connected to one end of, Q2is connected with the common anode of the three-phase uncontrolled rectifying circuit (2), Q2Collector electrode of (2) and (D)8And C1Are connected at the other end, L1And one end of (D)7Is connected to the anode of L1Another end of (D) and8The cathodes of the two electrodes are connected;
The shunt circuit (4) is composed of a power switch tube Q3～Q14Composition of, wherein Q3Is connected to the midpoint of the first series circuit, Q3Collector and Q of4Are connected to the collector of, Q4Emitter and D7Are connected to the anode of Q5Is connected to the midpoint of the second series circuit, Q5Collector and Q of6Are connected to the collector of, Q6Emitter and D7are connected to the anode of Q7is connected to the midpoint of the third series circuit, Q7Collector and Q of8Are connected to the collector of, Q8Emitter and D7The anodes of the anode groups are connected; q9Is connected to the midpoint of the first series circuit, Q9Collector and Q of10Are connected to the collector of, Q10Emitter and D8Is connected to the cathode of, Q11Is connected to the midpoint of the second series circuit, Q11Collector and Q of12Are connected to the collector of, Q12Emitter and D8Is connected to the cathode of, Q13Is connected to the midpoint of the third series circuit, Q13Collector and Q of14Are connected to the collector of, Q14Emitter and D8Are connected to each other.
2. The three-phase boost-buck PFC rectifier circuit of claim 1, wherein: power switch tube Q1～Q14Are MOSFETs or IGBTs and each include an anti-parallel diode.
3. The three-phase boost-buck PFC rectifier circuit of claim 1 or 2, wherein: the three-phase uncontrolled rectifying circuit also comprises an input filter, wherein the input filter is arranged at the front end of the three-phase uncontrolled rectifying circuit (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920865476.XU CN209787041U (en) | 2019-06-11 | 2019-06-11 | Three-phase boost-buck PFC (power factor correction) rectification circuit |
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| CN201920865476.XU CN209787041U (en) | 2019-06-11 | 2019-06-11 | Three-phase boost-buck PFC (power factor correction) rectification circuit |
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| CN209787041U true CN209787041U (en) | 2019-12-13 |
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| CN201920865476.XU Withdrawn - After Issue CN209787041U (en) | 2019-06-11 | 2019-06-11 | Three-phase boost-buck PFC (power factor correction) rectification circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112902A (en) * | 2019-06-11 | 2019-08-09 | 南昌航空大学 | A kind of three-phase buck-boost type PFC rectification circuit |
| CN112003466A (en) * | 2020-07-21 | 2020-11-27 | 西安理工大学 | Three-phase APFC rectifier capable of realizing voltage boosting and reducing and working method thereof |
| CN112864964A (en) * | 2021-03-22 | 2021-05-28 | 彭元修 | High efficiency is wire stripping device for electrical engineering |
-
2019
- 2019-06-11 CN CN201920865476.XU patent/CN209787041U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110112902A (en) * | 2019-06-11 | 2019-08-09 | 南昌航空大学 | A kind of three-phase buck-boost type PFC rectification circuit |
| CN110112902B (en) * | 2019-06-11 | 2024-02-09 | 南昌航空大学 | Three-phase boost-buck PFC rectification circuit |
| CN112003466A (en) * | 2020-07-21 | 2020-11-27 | 西安理工大学 | Three-phase APFC rectifier capable of realizing voltage boosting and reducing and working method thereof |
| CN112003466B (en) * | 2020-07-21 | 2021-12-17 | 西安理工大学 | Three-phase APFC rectifier capable of realizing voltage boosting and reducing and working method thereof |
| CN112864964A (en) * | 2021-03-22 | 2021-05-28 | 彭元修 | High efficiency is wire stripping device for electrical engineering |
| CN112864964B (en) * | 2021-03-22 | 2022-07-26 | 南昌航空大学 | High efficiency is wire stripping device for electrical engineering |
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