CN110829947A - Motor control system based on aviation three-phase PFC - Google Patents
Motor control system based on aviation three-phase PFC Download PDFInfo
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- CN110829947A CN110829947A CN201910963585.XA CN201910963585A CN110829947A CN 110829947 A CN110829947 A CN 110829947A CN 201910963585 A CN201910963585 A CN 201910963585A CN 110829947 A CN110829947 A CN 110829947A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/26—Power factor control [PFC]
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a motor control system based on aviation three-phase PFC, which comprises a three-phase PFC module and an inversion module, wherein a 115V/400Hz aviation alternating current power supply AC1 is input, a direct current power supply DC2(270V) direct current is output through the three-phase PFC module and is supplied to the inversion module to control a motor load, a traditional aviation 400Hz rectifier generally adopts a diode uncontrolled rectification device or a thyristor controlled rectification device, and the defects are obvious: the output voltage of the direct current side is uncontrollable, and the output can change along with the change of the input voltage and the load; the three-phase PFC module in the system is responsible for solving the problem of the current situation of the traditional aviation rectifier, provides a high-quality power supply, solves the interference of a motor system on an aviation onboard power grid, effectively reduces the volume and the weight of the whole system, and simultaneously improves the system safety.
Description
Technical Field
The invention relates to the technical field of motor control, in particular to a motor control system based on aviation three-phase PFC.
Background
In order to reduce the dead weight and improve the energy utilization efficiency of the airplane, the multi-electric airplane applies a variable-speed variable-frequency power supply system to an aviation power supply. The traditional aviation 400Hz rectifier generally adopts a diode uncontrolled rectification device or a thyristor controlled rectification device, which all belong to passive rectification schemes, and have obvious defects: the output voltage of the direct current side is uncontrollable, and the output can change along with the change of the input voltage and the load; the power factor is low, a large amount of harmonic waves are generated to an aviation power supply, and great hidden dangers are brought to safe and reliable operation of an airplane. The PWM rectifier with the high power factor has the advantages of input current sine, low harmonic content, high power factor, constant and controllable output direct-current voltage and the like, and the three-phase six-switch PWM rectifier is suitable for being applied to occasions with medium and high power due to the advantages of high power factor, bidirectional energy flowing and the like.
The aviation three-phase power supply module needs to be converted into weak current to provide a digital circuit for use, the problems of isolation, heating and the like are considered, a transformer is generally introduced after three-phase full-bridge rectification, and the integration degree of the three-phase aviation power supply module is limited due to the fact that the traditional transformer is backward in design of winding, a magnetic core and the like and large in size and weight.
The precision and the performance of the aviation inverter module are limited by the current situation of an aviation power supply, and the adverse effect of a motor system on a power grid can be fed back to the power supply input of the controller. The motor controller integrated with the high-quality power supply can reduce the volume and the weight, improve the control precision, eliminate the hidden danger of a power grid and improve the safety of the system.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems of the traditional aviation power supply and complete the task of aviation inverter control, the invention provides a motor control system based on aviation three-phase PFC.
The technical scheme is as follows:
a motor control system based on aviation three-phase PFC comprises a three-phase PFC module and an inversion module;
the three-phase PFC module comprises a three-phase input filtering unit, an auxiliary power supply, a sampling unit, a rectifying unit, a boosting unit and a PFC digital unit, wherein the three-phase input filtering unit is connected with the rectifying unit, the rectifying unit is respectively connected with the PFC digital unit and the boosting unit, the PFC digital unit is connected with the boosting unit, the auxiliary power supply is respectively connected with the sampling unit and the PFC digital unit, and the sampling unit is connected with the PFC digital unit;
the inversion module comprises an inversion module which comprises an inversion digital unit and a three-phase inversion unit, the inversion digital unit is connected with the three-phase inversion unit, the inversion digital unit is connected with an auxiliary power supply in the three-phase PFC module, and the three-phase inversion unit is connected with a boosting unit in the three-phase PFC module.
The three-phase input filtering unit comprises resistors R1, R2, R3, inductors L1, L2, L3, capacitors C1, C2 and C3, input ends of resistors R1, R2 and R3 are connected together, output ends of the resistors R1, R2 and R3 are respectively connected with input ends of the inductors L1, L2 and L3, output ends of the inductors L1, L2 and L3 are respectively connected with input ends of the capacitors C1, C2 and C3, and output ends of the capacitors C1, C2 and C3 are connected with the ground potential GND.
The rectifying unit is a voltage-reducing three-phase six-switch current type PWM rectifier and comprises diodes D1-D6, D1 '-D6', MOS transistors Q1-Q6, Q1 '-Q6', a capacitor C4, a rectifier positive output series inductor L4, a rectifier negative output series inductor L5 and a direct current power supply DC 1;
the diode D1 is connected with the MOS tube Q1 in series, the diode D2 is connected with the MOS tube Q2 in series, the diode D3 is connected with the MOS tube Q3 in series, the diode D4 is connected with the MOS tube Q4 in series, the diode D5 is connected with the MOS tube Q5 in series, the diode D6 is connected with the MOS tube Q6 in series to form a first switch group, a second switch group, a third switch group, a fourth switch group, a fifth switch group and a sixth switch group respectively, the first switch group is connected with the fourth switch group in series, the second switch group is connected with the fifth switch group in series, the third switch group is connected with the sixth switch group in series to form three rectifier bridge arms respectively, the three rectifier bridge arms are connected in parallel to form a rectifier unit main body structure, the positive output end of the rectifier unit main body structure is connected with the rectifier positive output series inductor L4, the negative output end of the rectifier unit main body structure is connected with the rectifier negative output series inductor L38, the rectifier positive output series inductor L4 and the rectifier negative output series inductor L5 are connected with the positive pole and the DC, the middle points of the three rectifier bridge arms are respectively connected with the output ends of inductors L1, L2 and L3 in the three-phase input filter unit;
the diode D1 ' is connected in series with the MOS transistor Q1 ', the diode D2 ' is connected in series with the MOS transistor Q2 ', the diode D3 ' is connected in series with the MOS transistor Q3 ', the diode D4 ' is connected in series with the MOS transistor Q4 ', the diode D5 ' is connected in series with the MOS transistor Q5 ', and the diode D6 ' is connected in series with the MOS transistor Q6 ' to form a first auxiliary switch group, a second auxiliary switch group, a third auxiliary switch group, a fourth auxiliary switch group, a fifth auxiliary switch group, and a sixth auxiliary switch group respectively, wherein the first auxiliary switch group is connected in parallel with the first switch group, the second auxiliary switch group is connected in parallel with the second switch group, the third auxiliary switch group is connected in parallel with the third switch group, the fourth auxiliary switch group is connected in parallel with the fourth switch group, the fifth auxiliary switch group is connected in parallel with the fifth switch group, the sixth auxiliary switch group is connected in parallel with the sixth switch group, and the gate of the MOS transistor Q1 ' in the first auxiliary switch group is connected with the gate 1, the gate of the MOS transistor Q2 ' in the second auxiliary switch group is connected with the gate of the MOS transistor Q2 in the second switch group, the gate of the MOS transistor Q3 ' in the third auxiliary switch group is connected with the gate of the MOS transistor Q3 in the third switch group, the gate of the MOS transistor Q4 ' in the fourth auxiliary switch group is connected with the gate of the MOS transistor Q4 in the fourth switch group, the gate of the MOS transistor Q5 ' in the fifth auxiliary switch group is connected with the gate of the MOS transistor Q5 in the fifth switch group, and the gate of the MOS transistor Q6 ' in the sixth auxiliary switch group is connected with the gate of the MOS transistor Q5 in the sixth switch group.
The boost unit is formed by connecting two boost topologies in parallel to form an interleaved boost unit and comprises a direct-current power supply DC1, a DC2, an inductor L5, an inductor L6, an inductor L7, an inductor L8, diodes D7 and D8, MOS (metal oxide semiconductor) tubes Q7 and Q8 and a capacitor C5, wherein the direct-current power supply DC1 forms one boost topology through the inductor L5, the MOS tube Q7, the diode D7 and the inductor L7, and the DC1 forms the other boost topology with the same specification through the inductor L6, the MOS tube Q8, the diode D8 and the inductor L7;
the positive end of the direct current power supply DC1 is connected with the input ends of inductors L5 and L6 respectively, the output end of the inductor L5 is connected with the drain electrode of an MOS tube Q7 and the anode of a diode D7 respectively, the output end of the inductor L6 is connected with the drain electrode of an MOS tube Q8 and the anode of a diode D8 respectively, the source electrodes of the MOS tubes Q7 and Q8 are connected with the negative end of the direct current power supply DC1 respectively, the negative electrodes of the diodes D7 and D8 are connected with the input end of an inductor L7, the output end of the inductor L7 is connected with one end of a capacitor C5 and the positive end of the direct current power supply DC2 respectively, the other end of the capacitor C5 and the negative end of the direct current power supply DC2 are connected with the input end of an inductor L8 respectively, and the output end of the inductor L8.
The three-phase inverter unit is a three-wire three-phase six-switch voltage type rectifier and comprises a direct-current power supply DC2, resistors R4, R5, R6 and R7, MOS tubes Q9-Q14 and Q9 '-Q14', MOS tubes Q9 and Q12 are connected in series, MOS tubes Q10 and Q13 are connected in series, MOS tubes Q11 and Q14 are connected in series to form a first inverter bridge arm, a second inverter bridge arm and a third inverter bridge arm respectively, the first inverter bridge arm, the second inverter bridge arm and the third inverter bridge arm are connected in parallel to form a three-phase inverter unit main body structure, the positive input end of the three-phase inverter unit main body structure is connected with the resistor R4 and the positive end of the direct-current power supply DC2, the negative input end of the three-phase inverter unit main body structure is connected with the negative end of the direct-current power supply DC2, the first inverter bridge arm, the second inverter bridge arm and the third inverter bridge arm are connected with resistors R5, R6 and R7, the ground potential, the resistors R5, R53 and R7 are connected with the second inverter, And the middle point of the third inverter bridge arm is respectively connected with an external motor load and outputs UVW three-phase voltage.
The MOS transistors Q9 'to Q14' are respectively connected in parallel at two ends of the MOS transistors Q9 to Q14 in a one-to-one correspondence manner, the grid of the MOS transistor Q9 'is connected with the grid of the MOS transistor Q9, the grid of the MOS transistor Q10' is connected with the grid of the MOS transistor Q10, the grid of the MOS transistor Q11 'is connected with the grid of the MOS transistor Q11, the grid of the MOS transistor Q12' is connected with the grid of the MOS transistor Q12, the grid of the MOS transistor Q13 'is connected with the grid of the MOS transistor Q13, and the grid of the MOS transistor Q14' is connected with the grid of the MOS transistor Q14.
The auxiliary power supply comprises a three-phase diode full-bridge rectifier, a PCB planar transformer X1, a linear voltage regulator LDO, an MOS tube Q15 and a control chip U1, wherein the input end of the three-phase diode full-bridge rectifier is connected with a three-phase input alternating current power supply AC1, and the output end of the three-phase diode full-bridge rectifier is connected with the input end of the PCB planar transformer X1; the output end of the PCB planar transformer X1 is connected with the input end of the linear voltage regulator LDO, the output end of the linear voltage regulator LDO supplies power for the digital unit and the sampling unit, the drain electrode of the MOS tube Q15 is connected with the primary coil of the PCB planar transformer X1, the grid electrode of the MOS tube Q15 is connected with the control chip U1, and the source electrode of the MOS tube Q15 is connected with the ground potential.
The three-phase diode full-bridge rectifier comprises diodes D9-D14 and D9 '-D14', the diodes D9 and D9 'are connected in series, the diodes D10 and D10' are connected in series, the diodes D11 and D11 'are connected in series, the diodes D12 and D12' are connected in series, the diodes D13 and D13 'are connected in series, the diodes D14 and D14' are connected in series to form a first diode group, a second diode group, a third diode group, a fourth diode group, a fifth diode group and a sixth diode group respectively, the first diode group and the fourth diode group are connected in series, the second diode group and the fifth diode group are connected in series, the third diode group and the sixth diode group are connected in series to form three diode group rectifying bridge arms respectively, the three diode group rectifying bridge arms are connected in parallel to form a three-phase diode full-bridge rectifier, the positive output end of the three-phase diode full-bridge rectifier is connected with a PCB planar transformer X1, the negative output end of the three-phase diode full, the middle points of the three power supply bridge arms are respectively connected with a three-phase input alternating current power supply AC 1.
The primary coil of the PCB planar transformer X1 is connected in parallel with a filter circuit formed by a capacitor C6, a resistor R8 and a diode D10 in series to form a coil freewheeling circuit, the positive output ends and the middle taps of a plurality of secondary coils of the PCB planar transformer X1 are connected in series with diodes, the positive output ends of the secondary coils are connected with a linear regulator LDO, and the negative output ends of the secondary coils are respectively connected with independent ground potentials.
And the PFC digital unit and the inversion digital unit are provided with sampling interfaces.
Has the advantages that: the invention provides a motor control system based on aviation three-phase PFC, which is based on 360 Hz-840 Hz of an airborne variable frequency power supply, a step-down rectifier, an interleaved boost, a PCB planar transformer and a double-output inductor are introduced into a power circuit, the problem of high integration of hardware is solved, and the system has the characteristics of high integration, light weight, miniaturization and high reliability. The motor control system consists of a three-phase PFC module and an inversion module, which are inseparable. The invention effectively improves the efficiency and stability of the power supply, ensures the control stability of the inversion module, ensures that the digital circuit is suitable for the variability of the power supply and the load, and is convenient for subsequent upgrading and maintenance.
Drawings
FIG. 1: the invention has a structural principle block diagram;
FIG. 2: a topology structure diagram of a three-phase input filtering unit and a topology structure diagram of a rectifying unit;
FIG. 3: a boost unit topology structure chart;
FIG. 4: a three-phase inversion unit topological structure;
FIG. 5: auxiliary power supply topological structure chart.
Detailed Description
The invention is further described with reference to the accompanying drawings, and as shown in fig. 1, the motor control system based on aviation three-phase PFC according to the invention includes a three-phase PFC module and an inverter module; the three-phase input voltage ABC is a variable frequency alternating current power supply 115V provided by airplane power generation and is divided into 2 flow directions, one flow direction provides an auxiliary power supply for converting and isolating low-voltage power supplies of 3.3V, 5V, 12V and the like to provide working power supplies of a sampling unit, a digital unit and the like, and the other flow direction provides a main power circuit for use.
The three-phase input voltage AC1 is converted into a direct current power supply DC1 with the voltage between 145V and 230V through a rectifying unit, then the direct current power supply DC2(270V) is output through an interleaved boosting unit to supply power to a three-phase inversion unit, a digital unit in the figure 1 is provided with a part of sampling interfaces, the sampling unit is used for compensating sampling points, sampling data are processed through a PFC digital unit, the PFC digital unit outputs PWM signals to control the output of the rectifying unit and the output of the boosting unit and provide power required by a system, the inversion module comprises an inversion digital unit and a three-phase inversion unit, the inversion module introduces 3.3V and 1.8V through the three-phase PFC module to provide power for the inversion digital unit, the inversion digital unit outputs PWM and controls MOS tubes of the three-phase inversion unit, and the purpose of inversion. The direct current power supply DC2 provides input of the three-phase inverter unit and outputs UVW control motor. The inversion digital unit completes the monitoring of the module by sampling the motor signal and the three-phase inversion unit signal, and adjusts the PWM output and control signal.
As shown in fig. 1, the three-phase PFC module of the present invention includes a three-phase input filter unit, an auxiliary power supply, a sampling unit, a rectifying unit, a boosting unit, and a PFC digital unit, wherein the three-phase input filter unit is connected to the rectifying unit, the rectifying unit is respectively connected to the PFC digital unit and the boosting unit, the PFC digital unit is connected to the boosting unit, the auxiliary power supply is respectively connected to the sampling unit and the PFC digital unit, and the sampling unit is connected to the PFC digital unit;
the inversion module comprises an inversion module which comprises an inversion digital unit and a three-phase inversion unit, the inversion digital unit is connected with the three-phase inversion unit, the inversion digital unit is connected with an auxiliary power supply in the three-phase PFC module, and the three-phase inversion unit is connected with a boosting unit in the three-phase PFC module.
The three-phase input filter unit topology shown in fig. 2 includes resistors R1, R2, R3, inductors L1, L2, L3, capacitors C1, C2, C3, and input terminals of resistors R1, R2, and R3 connected together, output terminals of resistors R1, R2, and R3 connected to input terminals of inductors L1, L2, and L3, output terminals of inductors L1, L2, and L3 connected to input terminals of capacitors C1, C2, and C3, and output terminals of capacitors C1, C2, and C3 connected to ground GND.
The rectifying unit is a voltage-reducing three-phase six-switch current type PWM rectifier and comprises diodes D1-D6, D1 '-D6', MOS transistors Q1-Q6, Q1 '-Q6', a capacitor C4, a rectifier positive output series inductor L4, a rectifier negative output series inductor L5 and a direct current power supply DC 1;
the diode D1 is connected with the MOS tube Q1 in series, the diode D2 is connected with the MOS tube Q2 in series, the diode D3 is connected with the MOS tube Q3 in series, the diode D4 is connected with the MOS tube Q4 in series, the diode D5 is connected with the MOS tube Q5 in series, the diode D6 is connected with the MOS tube Q6 in series to form a first switch group, a second switch group, a third switch group, a fourth switch group, a fifth switch group and a sixth switch group respectively, the first switch group is connected with the fourth switch group in series, the second switch group is connected with the fifth switch group in series, the third switch group is connected with the sixth switch group in series to form three rectifier bridge arms respectively, the three rectifier bridge arms are connected in parallel to form a rectifier unit main body structure, the positive output end of the rectifier unit main body structure is connected with the rectifier positive output series inductor L4, the negative output end of the rectifier unit main body structure is connected with the rectifier negative output series inductor L38, the rectifier positive output series inductor L4 and the rectifier negative output series inductor L5 are connected with the positive pole and the DC, the middle points of the three rectifier bridge arms are respectively connected with the output ends of inductors L1, L2 and L3 in the three-phase input filter unit;
the diode D1 ' is connected in series with the MOS transistor Q1 ', the diode D2 ' is connected in series with the MOS transistor Q2 ', the diode D3 ' is connected in series with the MOS transistor Q3 ', the diode D4 ' is connected in series with the MOS transistor Q4 ', the diode D5 ' is connected in series with the MOS transistor Q5 ', and the diode D6 ' is connected in series with the MOS transistor Q6 ' to form a first auxiliary switch group, a second auxiliary switch group, a third auxiliary switch group, a fourth auxiliary switch group, a fifth auxiliary switch group, and a sixth auxiliary switch group respectively, wherein the first auxiliary switch group is connected in parallel with the first switch group, the second auxiliary switch group is connected in parallel with the second switch group, the third auxiliary switch group is connected in parallel with the third switch group, the fourth auxiliary switch group is connected in parallel with the fourth switch group, the fifth auxiliary switch group is connected in parallel with the fifth switch group, the sixth auxiliary switch group is connected in parallel with the sixth switch group, and the gate of the MOS transistor Q1 ' in the first auxiliary switch group is connected with the gate 1, the gate of the MOS transistor Q2 ' in the second auxiliary switch group is connected with the gate of the MOS transistor Q2 in the second switch group, the gate of the MOS transistor Q3 ' in the third auxiliary switch group is connected with the gate of the MOS transistor Q3 in the third switch group, the gate of the MOS transistor Q4 ' in the fourth auxiliary switch group is connected with the gate of the MOS transistor Q4 in the fourth switch group, the gate of the MOS transistor Q5 ' in the fifth auxiliary switch group is connected with the gate of the MOS transistor Q5 in the fifth switch group, and the gate of the MOS transistor Q6 ' in the sixth auxiliary switch group is connected with the gate of the MOS transistor Q5 in the sixth switch group.
The first auxiliary switch group is connected with the first switch group in parallel, the second auxiliary switch group is connected with the second switch group in parallel, the third auxiliary switch group is connected with the third switch group in parallel, the fourth auxiliary switch group is connected with the fourth switch group in parallel, the fifth auxiliary switch group is connected with the fifth switch group in parallel, and the sixth auxiliary switch group is connected with the sixth switch group in parallel, so that the switch stress is effectively reduced, and the switch allowance is increased. The output can be divided into two inductors of L4 and L5, so that the size and the specification of the type selection inductor can be reduced. Capacitor C4 is a filter circuit representing output DC 1.
As shown in fig. 3, the boost unit is formed by connecting two boost topologies in parallel to form an interleaved boost unit, and includes a DC power supply DC1, a DC2, an inductor L5, an inductor L6, an inductor L7, an inductor L8, diodes D7, a diode D8, MOS transistors Q7, a transistor Q8, a capacitor C5, a DC power supply DC1 forms one boost topology through the inductor L5, the MOS transistor Q7, the diode D7, and the inductor L7, and a DC1 forms another boost topology with the same specification through the inductor L6, the MOS transistor Q8, the diode D8, and the inductor L7; the L7 and L8 inductors adopt the same specification, wherein the positive output passes through L7, the negative output passes through L8, so as to share the loop current and reduce the specification and the volume of the inductor, and the staggered boosting unit is beneficial to reducing the specification and the volume of a device and reducing voltage ripples; capacitor C5 is a filter circuit representing output DC 2.
The positive end of the direct current power supply DC1 is connected with the input ends of inductors L5 and L6 respectively, the output end of the inductor L5 is connected with the drain electrode of an MOS tube Q7 and the anode of a diode D7 respectively, the output end of the inductor L6 is connected with the drain electrode of an MOS tube Q8 and the anode of a diode D8 respectively, the source electrodes of the MOS tubes Q7 and Q8 are connected with the negative end of the direct current power supply DC1 respectively, the negative electrodes of the diodes D7 and D8 are connected with the input end of an inductor L7, the output end of the inductor L7 is connected with one end of a capacitor C5 and the positive end of the direct current power supply DC2 respectively, the other end of the capacitor C5 and the negative end of the direct current power supply DC2 are connected with the input end of an inductor L8 respectively, and the output end of the inductor L8.
As shown in fig. 4, the three-phase inverter unit is a three-wire three-phase six-switch voltage type rectifier, and includes a DC power supply DC2, resistors R4, R5, R6, R7, MOS transistors Q9-Q14, Q9 '-Q14', MOS transistors Q9 and Q12 connected in series, MOS transistors Q10 and Q13 connected in series, and MOS transistors Q11 and Q14 connected in series respectively form a first inverter arm, a second inverter arm, and a third inverter arm, the first inverter arm, the second inverter arm, and the third inverter arm are connected in parallel to form a main body structure of the three-phase inverter unit, a positive input end of the main body structure of the three-phase inverter unit is connected to the resistor R4 and a positive end of the DC power supply DC2, a negative input end of the main body structure of the three-phase inverter unit is connected to a negative end of the DC power supply DC2, the first inverter arm, the second inverter arm, and the third inverter arm are connected to resistors R5, R6, R7, the resistor R5, R6, the R7, and the first inverter arm are connected in parallel, The middle points of the second inverter bridge arm and the third inverter bridge arm are respectively connected with an external motor load to output UVW three-phase voltage;
the MOS tubes Q9 'to Q14' are respectively connected in parallel at two ends of the MOS tubes Q9 to Q14 in a one-to-one correspondence mode, the grid of the MOS tube Q9 'is connected with the grid of the MOS tube Q9, the grid of the MOS tube Q10' is connected with the grid of the MOS tube Q10, the grid of the MOS tube Q11 'is connected with the grid of the MOS tube Q11, the grid of the MOS tube Q12' is connected with the grid of the MOS tube Q12, the grid of the MOS tube Q13 'is connected with the grid of the MOS tube Q13, and the grid of the MOS tube Q14' is connected with the grid of the MOS tube Q14.
As shown in fig. 5, the auxiliary power supply includes a three-phase diode full-bridge rectifier, a PCB planar transformer X1, a linear regulator LDO, a MOS transistor Q15, and a control chip U1, wherein an input end of the three-phase diode full-bridge rectifier is connected to a three-phase input AC power AC1, and an output end of the three-phase diode full-bridge rectifier is connected to an input end of the PCB planar transformer X1; the output end of the PCB planar transformer X1 is connected with the input end of the linear voltage regulator LDO, the output end of the linear voltage regulator LDO supplies power for the digital unit and the sampling unit, the drain electrode of the MOS tube Q15 is connected with the primary coil of the PCB planar transformer X1, the source electrode of the MOS tube Q15 is connected with the ground potential, the grid electrode of the MOS tube Q15 is connected with the control chip U1, and the control chip U1 controls the energy of the primary coil through the MOS tube Q15.
The three-phase diode full-bridge rectifier comprises diodes D9-D14 and D9 '-D14', the diodes D9 and D9 'are connected in series, the diodes D10 and D10' are connected in series, the diodes D11 and D11 'are connected in series, the diodes D12 and D12' are connected in series, the diodes D13 and D13 'are connected in series, the diodes D14 and D14' are connected in series to form a first diode group, a second diode group, a third diode group, a fourth diode group, a fifth diode group and a sixth diode group respectively, the first diode group and the fourth diode group are connected in series, the second diode group and the fifth diode group are connected in series, the third diode group and the sixth diode group are connected in series to form three diode group rectifying bridge arms respectively, the three diode group rectifying bridge arms are connected in parallel to form a three-phase diode full-bridge rectifier, the positive output end of the three-phase diode full-bridge rectifier is connected with a PCB planar transformer X1, the negative output end of the three-phase diode full, the middle points of the three power supply bridge arms are respectively connected with a three-phase input alternating current power supply AC1, and the design can increase the design margin and improve the reliability.
The PCB planar transformer X1 is characterized in that a filter circuit formed by a capacitor C6 and a primary coil continuous current circuit formed by serially connecting a resistor R8 and a diode D10 are parallelly connected to a primary coil of the PCB planar transformer X1, diodes are serially connected to positive output ends and middle taps of a plurality of secondary coils of the PCB planar transformer X1, the positive output ends of the secondary coils are connected with a linear regulator LDO, the negative output ends of the secondary coils are respectively connected with independent ground potentials, a magnetic core is arranged between the primary coils and the secondary coils, the secondary coils obtain different voltage outputs through different winding bundles, the positive output ends of the secondary coils are connected with the linear regulator LDO, the linear regulator LDO provides stable voltages of 3.3V, 1.8V and the like, and the PCB planar transformer X1 utilizes a multilayer PCB structure to embed the windings of the primary coils and the plurality of secondary coils in each layer of PCB respectively and uses a customized magnetic core to cooperate to obtain required, this design greatly reduces transformer volume and weight.
Claims (9)
1. The utility model provides a motor control system based on aviation three-phase PFC which characterized in that: the system comprises a three-phase PFC module and an inversion module;
the three-phase PFC module comprises a three-phase input filtering unit, an auxiliary power supply, a sampling unit, a rectifying unit, a boosting unit and a PFC digital unit, wherein the three-phase input filtering unit is connected with the rectifying unit, the rectifying unit is respectively connected with the PFC digital unit and the boosting unit, the PFC digital unit is connected with the boosting unit, the auxiliary power supply is respectively connected with the sampling unit and the PFC digital unit, and the sampling unit is connected with the PFC digital unit;
the inversion module comprises an inversion module which comprises an inversion digital unit and a three-phase inversion unit, the inversion digital unit is connected with the three-phase inversion unit, the inversion digital unit is connected with an auxiliary power supply in the three-phase PFC module, and the three-phase inversion unit is connected with a boosting unit in the three-phase PFC module.
2. The aviation three-phase PFC-based motor control system according to claim 1, characterized in that: the three-phase input filtering unit comprises resistors R1, R2, R3, inductors L1, L2, L3, capacitors C1, C2 and C3, input ends of resistors R1, R2 and R3 are connected together, output ends of the resistors R1, R2 and R3 are respectively connected with input ends of the inductors L1, L2 and L3, output ends of the inductors L1, L2 and L3 are respectively connected with input ends of the capacitors C1, C2 and C3, and output ends of the capacitors C1, C2 and C3 are connected with the ground potential GND.
3. The aviation three-phase PFC-based motor control system according to claim 1, characterized in that: the rectifying unit is a voltage-reducing three-phase six-switch current type PWM rectifier and comprises diodes D1-D6, D1 '-D6', MOS transistors Q1-Q6, Q1 '-Q6', a capacitor C4, a rectifier positive output series inductor L4, a rectifier negative output series inductor L5 and a direct current power supply DC 1;
the diode D1 is connected with the MOS tube Q1 in series, the diode D2 is connected with the MOS tube Q2 in series, the diode D3 is connected with the MOS tube Q3 in series, the diode D4 is connected with the MOS tube Q4 in series, the diode D5 is connected with the MOS tube Q5 in series, the diode D6 is connected with the MOS tube Q6 in series to form a first switch group, a second switch group, a third switch group, a fourth switch group, a fifth switch group and a sixth switch group respectively, the first switch group is connected with the fourth switch group in series, the second switch group is connected with the fifth switch group in series, the third switch group is connected with the sixth switch group in series to form three rectifier bridge arms respectively, the three rectifier bridge arms are connected in parallel to form a rectifier unit main body structure, the positive output end of the rectifier unit main body structure is connected with the rectifier positive output series inductor L4, the negative output end of the rectifier unit main body structure is connected with the rectifier negative output series inductor L38, the rectifier positive output series inductor L4 and the rectifier negative output series inductor L5 are connected with the positive pole and the DC, the middle points of the three rectifier bridge arms are respectively connected with the output ends of inductors L1, L2 and L3 in the three-phase input filter unit;
the diode D1 ' is connected in series with the MOS transistor Q1 ', the diode D2 ' is connected in series with the MOS transistor Q2 ', the diode D3 ' is connected in series with the MOS transistor Q3 ', the diode D4 ' is connected in series with the MOS transistor Q4 ', the diode D5 ' is connected in series with the MOS transistor Q5 ', and the diode D6 ' is connected in series with the MOS transistor Q6 ' to form a first auxiliary switch group, a second auxiliary switch group, a third auxiliary switch group, a fourth auxiliary switch group, a fifth auxiliary switch group, and a sixth auxiliary switch group respectively, wherein the first auxiliary switch group is connected in parallel with the first switch group, the second auxiliary switch group is connected in parallel with the second switch group, the third auxiliary switch group is connected in parallel with the third switch group, the fourth auxiliary switch group is connected in parallel with the fourth switch group, the fifth auxiliary switch group is connected in parallel with the fifth switch group, the sixth auxiliary switch group is connected in parallel with the sixth switch group, and the gate of the MOS transistor Q1 ' in the first auxiliary switch group is connected with the gate 1, the gate of the MOS transistor Q2 ' in the second auxiliary switch group is connected with the gate of the MOS transistor Q2 in the second switch group, the gate of the MOS transistor Q3 ' in the third auxiliary switch group is connected with the gate of the MOS transistor Q3 in the third switch group, the gate of the MOS transistor Q4 ' in the fourth auxiliary switch group is connected with the gate of the MOS transistor Q4 in the fourth switch group, the gate of the MOS transistor Q5 ' in the fifth auxiliary switch group is connected with the gate of the MOS transistor Q5 in the fifth switch group, and the gate of the MOS transistor Q6 ' in the sixth auxiliary switch group is connected with the gate of the MOS transistor Q5 in the sixth switch group.
4. The aviation three-phase PFC-based motor control system according to claim 1, characterized in that: the boost unit is formed by connecting two boost topologies in parallel to form an interleaved boost unit and comprises a direct-current power supply DC1, a DC2, an inductor L5, an inductor L6, an inductor L7, an inductor L8, diodes D7 and D8, MOS (metal oxide semiconductor) tubes Q7 and Q8 and a capacitor C5, wherein the direct-current power supply DC1 forms one boost topology through the inductor L5, the MOS tube Q7, the diode D7 and the inductor L7, and the DC1 forms the other boost topology with the same specification through the inductor L6, the MOS tube Q8, the diode D8 and the inductor L7;
the positive end of the direct current power supply DC1 is connected with the input ends of inductors L5 and L6 respectively, the output end of the inductor L5 is connected with the drain electrode of an MOS tube Q7 and the anode of a diode D7 respectively, the output end of the inductor L6 is connected with the drain electrode of an MOS tube Q8 and the anode of a diode D8 respectively, the source electrodes of the MOS tubes Q7 and Q8 are connected with the negative end of the direct current power supply DC1 respectively, the negative electrodes of the diodes D7 and D8 are connected with the input end of an inductor L7, the output end of the inductor L7 is connected with one end of a capacitor C5 and the positive end of the direct current power supply DC2 respectively, the other end of the capacitor C5 and the negative end of the direct current power supply DC2 are connected with the input end of an inductor L8 respectively, and the output end of the inductor L8.
5. The aviation three-phase PFC-based motor control system according to claim 1, characterized in that: the three-phase inverter unit is a three-wire three-phase six-switch voltage type rectifier and comprises a direct-current power supply DC2, resistors R4, R5, R6 and R7, MOS tubes Q9-Q14 and Q9 '-Q14', MOS tubes Q9 and Q12 are connected in series, MOS tubes Q10 and Q13 are connected in series, MOS tubes Q11 and Q14 are connected in series to form a first inverter bridge arm, a second inverter bridge arm and a third inverter bridge arm respectively, the first inverter bridge arm, the second inverter bridge arm and the third inverter bridge arm are connected in parallel to form a three-phase inverter unit main body structure, the positive input end of the three-phase inverter unit main body structure is connected with the resistor R4 and the positive end of the direct-current power supply DC2, the negative input end of the three-phase inverter unit main body structure is connected with the negative end of the direct-current power supply DC2, the first inverter bridge arm, the second inverter bridge arm and the third inverter bridge arm are connected with resistors R5, R6 and R7, the ground potential, the resistors R5, R53 and R7 are connected with the second inverter, The middle point of the third inverter bridge arm is respectively connected with an external motor load and outputs UVW three-phase voltage;
the MOS transistors Q9 'to Q14' are respectively connected in parallel at two ends of the MOS transistors Q9 to Q14 in a one-to-one correspondence manner, the grid of the MOS transistor Q9 'is connected with the grid of the MOS transistor Q9, the grid of the MOS transistor Q10' is connected with the grid of the MOS transistor Q10, the grid of the MOS transistor Q11 'is connected with the grid of the MOS transistor Q11, the grid of the MOS transistor Q12' is connected with the grid of the MOS transistor Q12, the grid of the MOS transistor Q13 'is connected with the grid of the MOS transistor Q13, and the grid of the MOS transistor Q14' is connected with the grid of the MOS transistor Q14.
6. The aviation three-phase PFC-based motor control system according to claim 1, characterized in that: the auxiliary power supply comprises a three-phase diode full-bridge rectifier, a PCB planar transformer X1, a linear voltage regulator LDO, an MOS tube Q15 and a control chip U1, wherein the input end of the three-phase diode full-bridge rectifier is connected with a three-phase input alternating current power supply AC1, and the output end of the three-phase diode full-bridge rectifier is connected with the input end of the PCB planar transformer X1; the output end of the PCB planar transformer X1 is connected with the input end of the linear voltage regulator LDO, the output end of the linear voltage regulator LDO supplies power for the digital unit and the sampling unit, the drain electrode of the MOS tube Q15 is connected with the primary coil of the PCB planar transformer X1, the grid electrode of the MOS tube Q15 is connected with the control chip U1, and the source electrode of the MOS tube Q15 is connected with the ground potential.
7. The aviation three-phase PFC-based motor control system according to claim 6, wherein: the three-phase diode full-bridge rectifier comprises diodes D9-D14 and D9 '-D14', the diodes D9 and D9 'are connected in series, the diodes D10 and D10' are connected in series, the diodes D11 and D11 'are connected in series, the diodes D12 and D12' are connected in series, the diodes D13 and D13 'are connected in series, the diodes D14 and D14' are connected in series to form a first diode group, a second diode group, a third diode group, a fourth diode group, a fifth diode group and a sixth diode group respectively, the first diode group and the fourth diode group are connected in series, the second diode group and the fifth diode group are connected in series, the third diode group and the sixth diode group are connected in series to form three diode group rectifying bridge arms respectively, the three diode group rectifying bridge arms are connected in parallel to form a three-phase diode full-bridge rectifier, the positive output end of the three-phase diode full-bridge rectifier is connected with a PCB planar transformer X1, the negative output end of the three-phase diode full, the middle points of the three power supply bridge arms are respectively connected with a three-phase input alternating current power supply AC 1.
8. The aviation three-phase PFC-based motor control system according to claim 6, wherein: the primary coil of the PCB planar transformer X1 is connected in parallel with a filter circuit formed by a capacitor C6, a resistor R8 and a diode D10 in series to form a coil freewheeling circuit, the positive output ends and the middle taps of a plurality of secondary coils of the PCB planar transformer X1 are connected in series with diodes, the positive output ends of the secondary coils are connected with a linear regulator LDO, and the negative output ends of the secondary coils are respectively connected with independent ground potentials.
9. The aviation three-phase PFC-based motor control system according to claim 1, characterized in that: and the PFC digital unit and the inversion digital unit are provided with sampling interfaces.
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