CN111146937A - Three-switch tube three-phase PFC circuit control method and series topology structure - Google Patents
Three-switch tube three-phase PFC circuit control method and series topology structure Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
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- 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 belongs to the technical field of circuits, and discloses a three-switch tube three-phase PFC circuit control method with a coupling integrated inductor and a series of topological structures, wherein the series topological structures comprise: the three-phase rectifier bridge circuit, the PFC inductor and the PFC bidirectional power switch device are coupled and integrated; the conventional rectifier circuit outputs stable direct current after rectification, so that a rectifier diode has a conduction blind area; in the blind area, V is enabled by conducting the bidirectional power switch tube of the phaseiAnd Li、SiAnd a conductive loop is formed to supplement the phase current of the phase and improve the power factor. The control strategy provided by the invention reduces the current and voltage stress of the switching device, and has high efficiency and electromagnetic interference; in order to reduce the number and parameters of PFC inductors, three-phase coupling integrated inductors are adopted, the inductance can also be reduced by 1/3, the current peak value is reduced by about 15%, and the volume and the weight of the inductors are reduced by more than 40%.
Description
Technical Field
The invention belongs to the technical field of circuits, and particularly relates to a three-switch tube three-phase PFC circuit control method and a series topology structure.
Background
Currently, the closest prior art: the three-phase Power Factor Correction (PFC) circuit has various topological structures such as a single switching tube, two switching tubes, a three switching tube, a six switching tube and the like. In a low-power range, a single switch tube is generally applied, and in the case of high-power and energy bidirectional flow, six switch tubes are applied more. The three-switch tube also has application in the occasions of medium and high power and unidirectional energy flow.
In summary, the problems of the prior art are as follows: the conventional rectifying circuit outputs stable direct current after rectification, so that a rectifying diode has conduction dead zones (generally corresponding to the intervals of (0-30 degrees) and (150-180 degrees) of phase voltage).
For a single switch tube, which generally operates in Discontinuous (DCM) mode, the current stress is large, and in Buck three-phase PFC, the output voltage is low (C/C) (C)
VllIs line voltage, VoAs the output dc voltage). Large stress of switch tube (V)T＞2VLLM，VLLMAt peak line voltage, VTVoltage stress of the switching tube), the six-switching-tube three-phase PFC circuit is also called a Vienna circuit, and has the disadvantages of more devices, complex control and high cost.
The output voltage is higher
The three-switch tube three-phase PFC current control algorithm works in a full frequency range, the voltage and current stress of a switch device is large, the efficiency is not high, meanwhile, the three-phase PFC inductor is a discrete inductor, the inductance is large, the peak current is large, and the volume and the weight are large.
The difficulty of solving the technical problems is that ① series topological structures and composition modes exist, the proposed topological structure can adapt to different sites due to the fact that uncertainty exists in output of input three-phase zero lines, and ② three-phase coupling integrated inductance structure, parameter calculation and coil distribution exist.
The significance of solving the technical problems is as follows: the cost of the three-phase PFC circuit is reduced, the feasibility of the circuit is improved, and the three-phase PFC device which is practical, low in price and easy to produce is provided.
Disclosure of Invention
The invention provides a three-switch tube three-phase PFC circuit control method and a series topology structure, aiming at the problems of large switching loss, low efficiency, serious electromagnetic interference, large capacity of a switching device and the like in the prior art.
The invention is realized in this way, a three-switch tube three-phase PFC circuit control method and a series topology structure, the three-switch tube three-phase PFC circuit control method includes:
by utilizing the three-phase electricity natural reversing points of the power grid and the conduction sequence of the three-phase rectifier bridge, when phase values which cannot be conducted appear in A-phase electricity, B-phase electricity and C-phase electricity, the bidirectional switch device S is controlledaOperating to pass the corresponding phase current through the boost inductor LaAnd a bidirectional switch assembly SaAnd forming a loop to compensate the circuit in the current position period time, and performing decoupling control on the three-phase power.
Further, the decoupling control of the three-phase power includes:
the three-phase boosting inductor adopts an integrated coupling mode, reduces the number of inductors, and simultaneously reduces the inductance to 1- | α | times of the separated inductor, wherein α is a coupling coefficient;
the three integrated coupling inductance magnetic core structures are in a distributed mode and an integrated mode, and the winding is in distributed winding or centralized winding; mutual inductance of the integrated coupling inductor: m12＝M21＝M13＝M31＝M23＝M23＝M<0。
Another object of the present invention is to provide a series of PFC topologies for implementing the method for controlling a three-phase PFC circuit with three switching tubes, where the series of PFC topologies include:
the three-phase rectifier bridge comprises a group of coupling integrated inductance modules, a three-phase rectifier bridge and three bidirectional power switch assemblies;
the group of coupling integrated inductance modules are three high-frequency inductance modules;
the three high-frequency inductance modules are connected with the input ends of the three bidirectional power switch assemblies;
the input ends of the three bidirectional power switch assemblies are connected with the negative end of the three-phase rectifier bridge or connected with the output capacitor; the common point of the three bidirectional power switch assemblies is connected with a power grid zero line or an output capacitor or the voltage midpoint of the output capacitor, and the other end of the output capacitor is connected with the cathode of the direct-current power supply;
two ends of the three-phase rectifier bridge are respectively connected with the positive electrode and the negative electrode of the output capacitor; and the input end of the three-phase rectifier bridge is connected with the three high-frequency inductance modules.
Further, the series PFC topology further comprises:
the three high frequency inductance modules comprise a boost inductor LaBoost inductor LbBoost inductor Lc(ii) a The boost inductor LaBoost inductor LbBoost inductor LcInductors wound by high-frequency magnetic cores;
the three-phase rectifier bridge comprises a rectifier bridge D1Rectifier bridge D2Rectifier bridge D3Rectifier bridge D4Rectifier bridge D5Rectifier bridge D6(ii) a Said D1～D6The high-frequency rectifier bridges are all formed by high-frequency rectifier bridges or high-frequency fast recovery diodes;
the three bidirectional power switch assemblies include: bidirectional switch assembly SaBidirectional switch assembly SbBidirectional switch assembly Sc(ii) a The bidirectional switch component SaBidirectional switch assembly SbBidirectional switch assembly ScAll are power MOSFET or IGBT devices, or four ultrafast recovery diodes plus power MOSFET or four IGBT devices;
the boost inductor LaBoost inductor LbBoost inductor LcAnd a bidirectional switch assembly SaBidirectional switch assembly SbBidirectional switch assembly ScCommon terminal and D formed by connecting together1～D6The middle points of the three-phase rectifier bridges are connected; said D1～D6The output of the rectifier bridge is connected with a filter capacitor to obtain a DC output voltage Vdc；
The bidirectional switch component SaBidirectional switch assembly SbBidirectional switch assembly ScThe common terminal of the component is connected with the zero point or the voltage midpoint of the output capacitor or the output capacitor.
Another object of the present invention is to provide a three-switch tube three-phase PFC circuit control system for implementing the three-switch tube three-phase PFC circuit control method, the three-switch tube three-phase PFC circuit control system comprising:
a three-phase electric phase detection module; the phase angle capturing module is connected with the three-phase voltage phase angle capturing module and the series PFC topological structures and is formed by mutually connecting a phase-locked loop and a PLL; the system is used for completing zero-crossing detection of the power grid voltage; the phase-locked loop is used for regulating and controlling the anti-interference state of the PLL;
a three-phase voltage phase angle capturing module; the system is connected with a bidirectional switch PWM driving signal generating module and the serial PFC topological structures and used for judging phase limits and generating 30-degree pulses; performing high-frequency PWM detection within a 30-degree pulse range;
the bidirectional switch PWM driving signal generating module is connected with the three-phase voltage phase angle capturing module and is used for driving the bidirectional switch to be switched on and off by amplifying, isolating and amplifying the high-frequency PWM signal which is connected with a gate pole G of the bidirectional switch PWM driving signal generating module; while being used to pass the detected output voltage VdcThe value of (d) adjusts the duty cycle of the PWM signal.
Further, the bidirectional switch PWM driving signal generating module includes:
the voltage stress of the bidirectional switch PWM driving signal generation module is expressed as:
in summary, the advantages and positive effects of the invention are: the structure of the invention is characterized in that the main power switch tube device is positioned at the bypass position, the average current is small, and the power consumption is small; the invention has simple control, the peak current born by the switch device is only half of the rated current, the loss is low, the efficiency is high, and the electromagnetic interference is small; on the basis of the three-switch topological structure, three separated Boost energy storage inductors are coupled and integrated through distributed or centralized magnetic cores, so that the numerical value of the inductor is reduced, and the size, weight and cost are reduced.
The invention provides a topological structure, which enables a power switch tube to be positioned at a bypass position of current transmission to reduce the conduction loss of a device; meanwhile, the voltage stress of the switching device is reduced by the connection mode of the common end of the bidirectional power switching device; the control strategy adopted by the invention reduces the switching times, avoids the conduction of the switching device when the peak value, reduces the current stress of the switching device, improves the efficiency and reduces the electromagnetic interference. The invention provides a coupling integration mode for the PFC inductor, which reduces the electric quantity parameter, the cost and the volume weight of the inductor.
The main power switch tube device of the structure is positioned at the bypass position, so that the average current is small, and the power consumption is low; meanwhile, aiming at the structure, according to the characteristic that the interphase natural phase change of three-phase power relates to the conduction sequence of a rectifier diode, a control strategy of Pulse Width Modulation (PWM) of phase voltages in the ranges of (0-30 degrees), (150-180 degrees), (180-210 degrees) and (330-360 degrees) is provided. The invention has simple control, low loss, high efficiency and small electromagnetic interference, and the peak current borne by the switching device is only half of the rated current.
Compared with the prior art, the invention has the following advantages:
(1) the topological structure is simple. The conventional three-phase bridge rectification circuit is not changed. Meanwhile, the integrated coupling inductor is connected in series in a loop and has small parameters, so that the volume and the weight are effectively reduced.
(2) The additional three-phase power factor correction power switch is in a current bypass position, and the rectified current flows only in part of time, so that the power is small and the efficiency is high.
(3) And the inductance value, the volume and the weight of the inductor are reduced by adopting a coupling inductor mode, and the installation is convenient.
(4) The control is simple, the engineering implementation is convenient, and the industrialization is easy.
(5) The power switch device only works when the sine wave is less than 30 degrees, the current stress is only half of the peak current, the power consumption is low, and the reliability is high.
(6) In a power grid voltage period, the average switching times of the bidirectional power switch device are few, the switching loss is small, the electromagnetic interference is small, and the efficiency is high.
Table 1 is a comparison table of the key parameters of the present invention and the PWM three-phase power factor correction circuit in the 60KW three-phase power factor correction device.
TABLE 1 comparison table of key parameters of the invention and PWM three-phase power factor correction circuit
Table 2 shows the comparison table of PFC inductance of the present invention and the conventional three-switch (PO 60kw, α -1/3)
| Inductance value | Volume (cm)3) | Weight (kg) | |
| Separated type | 1.2mH | 6250 | 15 |
| Integrated coupling type | 0.8mH | 3600 | 10 |
Table 3 comparison table of the present invention and other conventional three-phase PFC circuit devices
L*、V*、Ap*The reference values are respectively based on the inductance volume and the inductance area of the six-switch topological structure.
Drawings
Fig. 1 is a circuit diagram of a common point connection power grid neutral line of three bidirectional power switch assemblies provided by an embodiment of the invention.
In the figure: 1. three high-frequency inductance modules; 2. three bidirectional power switch assemblies; 3. a three-phase full bridge rectifier; 4. and outputting a filter capacitor.
Fig. 2 is a circuit diagram of a negative electrode circuit in which a common point of three bidirectional power switch assemblies provided by an embodiment of the invention is connected to one end of an output capacitor, and the other end of the output capacitor is connected to a direct-current power supply.
Fig. 3 is a circuit diagram of a common point connection of three bidirectional power switch assemblies at the midpoint of the output capacitor voltage according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a three-phase PFC circuit control system according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a three-phase PFC circuit control system according to an embodiment of the present invention.
In the figure: 5. a three-phase electric phase detection module; 6. a three-phase electric phase capturing module; 7. and the bidirectional switch PWM driving signal generation module.
Fig. 6 is a graph comparing efficiency provided by embodiments of the present invention.
Fig. 7 is a structural diagram of a coupled inductor core according to an embodiment of the present invention. In the figure: (a) distributed coupling; (b) and (4) centralized coupling.
Fig. 8 is a schematic diagram of input current waveforms of the split and integrated coupling modes according to an embodiment of the present invention.
In the figure: (a) the input voltage and current of the separated inductor simulate waveforms; (b) the input voltage and current of the coupled inductor simulate waveforms.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The main problems in the existing multi-switch tube three-phase Power Factor Correction (PFC) and control scheme are as follows: the structure is complex, and the number of power switching devices is large; the adopted Space Vector (SVPWM) control mode has high switching frequency and a plurality of detection elements; the power switch device has large voltage and current stress and high cost.
In view of the problems in the prior art, the present invention provides a three-switch tube three-phase PFC circuit control method and a series topology structure thereof, and the present invention is described in detail below with reference to the accompanying drawings.
The three-switch tube three-phase PFC circuit control method provided by the embodiment of the invention comprises the following steps:
by utilizing the three-phase electricity natural reversing points of the power grid and the conduction sequence of the three-phase rectifier bridge, when phase values which cannot be conducted appear in A-phase electricity, B-phase electricity and C-phase electricity, the bidirectional switch device S is controlledaOperating to pass the corresponding phase current through the boost inductor LaAnd a bidirectional switch assembly SaAnd forming a loop to compensate the circuit in the current position period time, and performing decoupling control on the three-phase power.
The three-phase power decoupling control provided by the embodiment of the invention comprises the following steps:
the three-phase boosting inductor adopts an integrated coupling mode, reduces the number of inductors, and simultaneously reduces the inductance to 1- | α | times of the separated inductor, wherein α is a coupling coefficient.
The three integrated coupling inductance magnetic core structures provided by the embodiment of the invention are in a distributed mode and an integrated mode, and the winding is in distributed winding or centralized winding; mutual inductance of the integrated coupling inductor: m12＝M21＝M13＝M31＝M23＝M23＝M<0。
As shown in fig. 1 to fig. 3, a series of PFC topologies provided by an embodiment of the present invention includes: the three-phase power supply comprises a group of coupling integrated inductance modules (three high-frequency inductance modules) 1, a three-phase rectifier bridge 2 and three bidirectional power switch assemblies 3.
The three high-frequency inductance modules provided by the embodiment of the invention are connected with the input ends of the three bidirectional power switch assemblies.
The input ends of the three bidirectional power switch assemblies provided by the embodiment of the invention are connected with the negative pole end of the three-phase rectifier bridge or connected with the output capacitor; and the common point of the three bidirectional power switch assemblies is connected with a power grid zero line or an output capacitor or the voltage midpoint of the output capacitor, and the other end of the output capacitor is connected with the cathode of the direct-current power supply.
Two ends of the three-phase rectifier bridge provided by the embodiment of the invention are respectively connected with the anode and the cathode of the output capacitor; and the input end of the three-phase rectifier bridge is connected with the three high-frequency inductance modules.
The serial PFC topological structure provided by the embodiment of the invention also comprises:
the three high-frequency inductance modules provided by the embodiment of the invention comprise a boost inductor LaBoost inductor LbBoost inductor Lc(ii) a The boost inductor LaBoost inductor LbBoost inductor LcAll are inductors wound by high-frequency magnetic cores.
The three-phase rectifier bridge provided by the embodiment of the invention comprises a rectifier bridge D1Rectifier bridge D2Rectifier bridge D3Rectifier bridge D4Rectifier bridge D5Rectifier bridge D6(ii) a Said D1～D6The high-frequency rectifier bridge is formed by a high-frequency rectifier bridge or a high-frequency fast recovery diode.
The three bidirectional power switch assemblies provided by the embodiment of the invention comprise: bidirectional switch assembly SaBidirectional switch assembly SbBidirectional switch assembly Sc(ii) a The bidirectional switch component SaBidirectional switch assembly SbBidirectional switch assembly ScAll are power MOSFET or IGBT devices, or four ultrafast recovery diodes plus power MOSFET or four IGBT devices.
The boost inductor L provided by the embodiment of the inventionaBoost inductor LbBoost inductor LcAnd a bidirectional switch assembly SaBidirectional switch assembly SbBidirectional switch assembly ScCommon terminal and D formed by connecting together1～D6The middle points of the three-phase rectifier bridges are connected; said D1～D6The output of the rectifier bridge is connected with a filter capacitor to obtain a DC output voltage Vdc。
The embodiment of the invention provides a bidirectional switch component SaBidirectional switch assembly SbBidirectional switch assembly ScThe common terminal of the component is connected with the zero point or the voltage midpoint of the output capacitor or the output capacitor.
As shown in fig. 4 to 5, a three-switch tube three-phase PFC circuit control system according to an embodiment of the present invention includes:
a three-phase electric phase detection module 5; the three-phase voltage phase angle capturing module 6 and the series PFC topological structures are connected and are formed by mutually connecting phase-locked loops and PLLs; the system is used for completing zero-crossing detection of the power grid voltage; the phase-locked loop is used for regulating and controlling the anti-interference state of the PLL.
A three-phase voltage phase angle capturing module 6; the system is connected with a bidirectional switch PWM driving signal generating module 7 and the serial PFC topological structures and used for judging phase limits and generating 30-degree pulses; high frequency PWM detection is performed in the 30 ° pulse range.
The bidirectional switch PWM driving signal generating module 7 is connected with the three-phase voltage phase angle capturing module 6 and is used for driving the bidirectional switch to be switched on and off by connecting the high-frequency PWM signal with a gate pole G of the bidirectional switch PWM driving signal generating module through amplification, isolation and amplification; while being used to pass the detected output voltage VdcThe value of (d) adjusts the duty cycle of the PWM signal.
The bidirectional switch PWM driving signal generating module 7 provided in the embodiment of the present invention includes:
the voltage stress of the bidirectional switch PWM driving signal generation module is expressed as:
the present invention will be further described with reference to the following specific examples.
Example 1
The embodiment of the invention provides a control method for a three-phase PFC circuit of a three-switch tubeThe method for controlling the three-switch tube three-phase PFC circuit comprises the following steps: using L according to different phase voltagesiAnd the bidirectional switch PWM driving signal generating module forms a Boost current converter to only carry out PWM control on (0-30 degrees), (150-180 degrees), (180-210 degrees) and (330-360 degrees) of phase voltage, so that the phase current and the voltage are in the same phase, and the power factor is corrected, wherein i is a, b and c.
The voltage stress of the module for generating the compensated bidirectional switch PWM driving signal is expressed as:
wherein VsRepresenting switching voltage stress, VdcRepresenting the dc bus voltage.
Example 2
As shown in fig. 1-3, the embodiments of the present invention provide a series of PFC topologies including:
three high-frequency inductance modules, a three-phase rectifier bridge and three bidirectional power switch components.
The three high-frequency inductance modules are connected with the input ends of the three bidirectional power switch assemblies; the input ends of the three bidirectional power switch assemblies are connected with the negative electrode end of the three-phase rectifier bridge or connected with the output capacitor.
The output ends of the three high-frequency inductance modules are connected with the input end of the three-phase rectifier bridge.
Two ends of the three-phase rectifier bridge are respectively connected with the anode and the cathode of the output capacitor.
Referring to fig. 1, three bidirectional power switch assemblies are connected with a neutral line of a power grid in a common point mode; two ends of the three-phase rectifier bridge are respectively connected with the anode and the cathode of the output capacitor.
As shown in fig. 2, the common point of the three bidirectional power switch assemblies is connected to one end of the output capacitor, and the other end of the output capacitor is connected to the "-" pole of the dc power supply.
As shown in fig. 3, the common point of the three bi-directional power switch assemblies is connected at the output capacitor voltage midpoint.
The three high frequency inductance modules comprise a boost inductor LaBoost inductor LbBoost inductorDevice Lc(ii) a All are inductors wound by high-frequency magnetic cores.
The three bidirectional power switch assemblies include:
bidirectional switch assembly SaBidirectional switch assembly SbBidirectional switch assembly Sc(ii) a Bidirectional switch assembly SaBidirectional switch assembly SbBidirectional switch assembly ScAnd the other ends are connected together to form a common terminal.
Boost inductor LaBoost inductor LbBoost inductor LcAnd a bidirectional switch assembly SaBidirectional switch assembly SbBidirectional switch assembly ScCommon and D connected together1～D6The middle points of the three-phase rectifier bridges are connected; d1～D6The output of the rectifier bridge is connected with a filter capacitor to obtain a DC output voltage Vdc。
D1～D6The high-frequency rectifier bridge is formed by a high-frequency rectifier bridge or a high-frequency fast recovery diode.
Bidirectional switch assembly SaBidirectional switch assembly SbBidirectional switch assembly ScAll are power MOSFET or IGBT devices, or four ultrafast recovery diodes plus power MOSFET or four IGBT devices.
Bidirectional switch assembly SaBidirectional switch assembly SbBidirectional switch assembly ScAnd the common end of the bidirectional switch is connected with a zero point or the voltage midpoint of the output capacitor or the output capacitor.
As shown in fig. 4 to 5, a three-switch tube three-phase PFC circuit control system according to an embodiment of the present invention includes:
a three-phase electric phase detection module; and the three-phase voltage phase angle capturing module is connected with the three-phase voltage phase angle capturing module and is used for completing zero-crossing detection of the power grid voltage.
A three-phase voltage phase angle capturing module; the bidirectional switch PWM driving signal generation module is connected with the bidirectional switch PWM driving signal generation module and is used for judging phase limit and generating 30-degree pulse; high frequency PWM detection is performed in the 30 ° pulse range.
And the bidirectional switch PWM driving signal generating module is used for driving the bidirectional switch to be switched on and off by amplifying, isolating and amplifying the high-frequency PWM signal connected with the gate pole G of the bidirectional switch PWM driving signal generating module.
And the PWM circuit is also used for adjusting the duty ratio of the PWM signal by detecting the output voltage value.
The three-phase electric phase detection module consists of a phase-locked loop and a PLL (phase locked loop) which are connected with each other.
The phase-locked loop is used for regulating and controlling the anti-interference state of the PLL.
And the three-phase electric phase detection module and the three-phase voltage phase angle capture module are connected with an external series PFC topological structure.
Example 3
The structure of figure 2 is that the common point of three bidirectional switch components is connected with one end of the energy storage capacitor, and the other end of the output filter capacitor is connected with the negative pole of the direct current power supply. The method is characterized in that: reducing voltage stress (V) of a switching assemblyS＝Vdc-VChIn which V isSRepresenting voltage stress, V, of the switching assemblydcRepresenting bus voltage, VChStorage capacitor voltage), boost inductance L is increasediThe value of (i ═ a, b, c) reduces the input current harmonics.
The structure form of the attached figure 3 is as follows: the common point of the three bidirectional power switch components is connected to the output voltage midpoint, and the bidirectional power switch component is characterized in that: reducing voltage stress (V) of a switching assemblyS＝Vdc/2 wherein VSRepresenting voltage stress, V, of the switching assemblydcRepresenting bus voltage), boost inductance L is increasediThe value of (i ═ a, b, c) reduces the input current harmonics.
The circuit A, B, C is connected with A, B, C three-phase power supply via three boosting inductors La、Lb、LcAnd three by-pass bidirectional switch assemblies Sa、Sb、Sc，Sa、Sb、ScThe other ends are connected together to form a common end, and a series structure is formed according to the attached figures 1, 2 and 3, La、Lb、LcAnd Sa、Sb、ScCommon and D connected together1～D6The middle points of the three-phase rectifier bridge are connected, D1～D6The output of the rectifier bridge is connected with a filter capacitor to obtain a DC output voltage Vdc。
D1～D6The high-frequency rectifier bridge is formed by selecting the high-frequency rectifier bridge or the high-frequency fast recovery diode, so that the reverse recovery current of the diode can be reduced, and the electromagnetic interference is small.
Sa、Sb、ScThe bypass power current of the bidirectional switch and the rectifier mainly passes through a diode D1～D6For the load to work. The bidirectional switch has small current effective value, low loss and high efficiency.
Sa、Sb、ScA common terminal formed by the bidirectional switches is connected with a zero point or an energy storage capacitor or the midpoint of an output main current voltage, so that the voltage stress of a power switch component can be reduced, and the phase voltage can be modulated independently.
Control method for three-switch three-phase PFC circuit, because three-phase power has natural commutation point between phases, according to D of figure 11～D6Form three-phase full-bridge rectification, taking phase A as an example, and 0 degree in the rectification process<wt<30 DEG and 150 DEG<wt<Within a range of 180 DEG, D1Is non-conducting and wt is continuously conducting in the range (30-150 deg.).
Example 4
As shown in figure 1, the invention discloses a basic bidirectional three-switch power factor correction series circuit. The common point of the power switch device is connected with a zero line; two circuits shown in figure 2 (the common point of the power switch device is connected with the energy storage capacitor) and figure 3 (the common point of the power switch device is connected with the output direct-current voltage midpoint) can be derived according to different connection positions of the common point of the bidirectional power switch device.
The method comprises the following steps: the three-phase power supply comprises a three-phase integrated coupling inductor 1, three bidirectional power switch assemblies 2, a three-phase full-bridge rectifier 3 and an output filter capacitor 4.
The three starting ends of the three-phase integrated coupling inductor 1 are respectively connected with three phases A, B and C, and the other end of the three-phase integrated coupling inductor is connected with three middle points of a three-phase full-bridge rectifier 3 and the starting end of a bidirectional power switch tube assembly 2; the other ends of the three power switching tube assemblies 2 are connected together to form a common end, and the common end can be connectedThe zero line, the middle point of the direct current output 4 voltage or one end of the output capacitor form a series structure; the output anode and the output cathode of the three-phase full-bridge rectifier 3 are respectively connected with the output filter capacitor 4CdThe "+" and "-" terminals (C) ofdElectrolytic capacitors).
Fig. 5 is a control block diagram based on the above circuit disclosed by the invention.
The device comprises a three-phase electric phase detection module 5(PLL), a three-phase electric phase capturing module 6 and a bidirectional switch PWM driving signal generation module 7.
The input end of the three-phase electric phase detection module 5 is connected with three phases of a power grid A, B and C, a square wave signal is formed after PLL phase locking and zero-crossing identification and is sent to the three-phase electric phase capture module 6, the three-phase electric phase capture module 6 processes the signal of the three-phase electric phase detection module 5 to form various +/-30-degree PWM control signals and sends the PWM control signals to the bidirectional switch PWM driving signal generation module 7, and the bidirectional switch PWM driving signal generation module 7 isolates the signal sent by the three-phase electric phase capture module 6, and the signal is amplified and then connected with a gate pole of a power bidirectional switch assembly to drive the bidirectional assembly to work.
Designing parameters: po＝60KW，Vh＝220V/50Hz,La＝Lb＝Lc＝400μH。
Two-way light-emitting device: FF450R12KS 4150A/600V.
Output filter capacitor CdThe PWM drive signal duty ratio D is 1000 μ F to 0.57.
The input current voltage waveform, tested PF >0.99, THD < 9.2% meets the requirements of relevant factors and harmonic standard.
The invention is further described below in connection with specific experiments.
Fig. 6 is an efficiency comparison curve, which shows that the efficiency is approximately 2% higher compared with the three-phase PWM rectification efficiency. By way of example, the advantages of the invention are fully illustrated in that:
(1) theoretical analysis shows that the PFC power topology has the advantages of simple structure, easiness in control, high power factor, low total harmonic component on the network side, high conversion efficiency, high power density and the like;
(2) theoretical analysis shows that the topology mainly comprises a zero-crossing current compensation circuit and a three-phase uncontrolled rectifying circuit, the three-phase uncontrolled rectifying circuit realizes current conversion, and the zero-crossing current compensation circuit inhibits current distortion at a network side, improves a power factor and reduces THD.
(3) Theoretical analysis shows that the topological loss mainly comes from conduction loss of a fast recovery diode of a three-phase uncontrolled rectifying circuit and switching loss of a power switching device of a zero-crossing current compensation circuit. Theories and experiments verify that the novel PFC rectification topology has low loss, can improve the overall efficiency without a soft switch auxiliary network, and is suitable for medium-high power occasions;
(4) the control method is simple and easy to realize, the control loop is stable, and the control method is safer and more reliable when used in medium and high power occasions.
In an embodiment of the present invention, as shown in fig. 7, (a) distributed coupling; (b) and (4) centralized coupling. As shown in fig. 8, (a) input voltage and current simulation waveforms of the split inductor; (b) the input voltage and current of the coupled inductor simulate waveforms.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A three-switch tube three-phase PFC circuit control method is characterized by comprising the following steps:
by utilizing the three-phase electricity natural reversing points of the power grid and the conduction sequence of the three-phase rectifier bridge, when phase values which cannot be conducted appear in A-phase electricity, B-phase electricity and C-phase electricity, the bidirectional switch device S is controlledaOperating to pass the corresponding phase current through the boost inductor LaAnd a bidirectional switch assembly SaAnd forming a loop to compensate the circuit in the current position period time, and performing decoupling control on the three-phase power.
2. The method for controlling the three-phase PFC circuit of claim 1, wherein the method for decoupling and controlling the three-phase power comprises:
the three-phase boosting inductor adopts an integrated coupling mode, reduces the number of inductors, and simultaneously reduces the inductance to 1- | α | times of the separated inductor, wherein α is a coupling coefficient;
the three integrated coupling inductance magnetic core structures adopt a distribution mode and an integration mode, and the winding is in distributed winding or centralized winding;
mutual inductance of integrated coupling inductors: m12＝M21＝M13＝M31＝M23＝M23＝M<0。
3. A series of PFC topologies for implementing the three-switch tube three-phase PFC circuit control method of any one of claims 1-2, wherein the series of PFC topologies comprises: the three-phase rectifier bridge comprises a group of coupling integrated inductance modules, a three-phase rectifier bridge and three bidirectional power switch assemblies;
the group of coupling integrated inductance modules comprises three high-frequency inductance modules;
the three high-frequency inductance modules are connected with the input ends of the three bidirectional power switch assemblies;
the input ends of the three bidirectional power switch assemblies are connected with the negative end of the three-phase rectifier bridge or connected with the output capacitor; the common point of the three bidirectional power switch assemblies is connected with a power grid zero line or an output capacitor or the voltage midpoint of the output capacitor, and the other end of the output capacitor is connected with the cathode of the direct-current power supply;
two ends of the three-phase rectifier bridge are respectively connected with the positive electrode and the negative electrode of the output capacitor; and the input end of the three-phase rectifier bridge is connected with the three high-frequency inductance modules.
4. The series PFC topology of claim 3, further comprising:
the three high frequency inductance modules comprise a boost inductor LaBoost inductor LbBoost inductor Lc(ii) a The boost inductor LaBoost inductor LbBoost inductor LcInductors wound by high-frequency magnetic cores;
the three-phase rectifier bridge comprises a rectifier bridge D1Rectifier bridge D2Rectifier bridge D3Rectifier bridge D4Rectifier bridge D5Rectifier bridge D6(ii) a Said D1～D6The high-frequency rectifier bridges are all formed by high-frequency rectifier bridges or high-frequency fast recovery diodes;
the three bidirectional power switch assemblies include: bidirectional switch assembly SaBidirectional switch assembly SbBidirectional switch assembly Sc(ii) a The bidirectional switch component SaBidirectional switch assembly SbBidirectional switch assembly ScAll are power MOSFET or IGBT devices, or four ultrafast recovery diodes plus power MOSFET or four IGBT devices;
the boost inductor LaBoost inductor LbBoost inductor LcAnd a bidirectional switch assembly SaBidirectional switch assembly SbBidirectional switch assembly ScCommon terminal and D formed by connecting together1～D6The middle points of the three-phase rectifier bridges are connected; said D1～D6The output of the rectifier bridge is connected with a filter capacitor to obtain a DC output voltage Vdc；
The bidirectional switch component SaBidirectional switch assembly SbBidirectional switch assembly ScThe common terminal of the component is connected with the zero point or the voltage midpoint of the output capacitor or the output capacitor.
5. A three-switch tube three-phase PFC circuit control system for implementing the three-switch tube three-phase PFC circuit control method according to any one of claims 1 to 2, comprising:
a three-phase electric phase detection module; the phase angle capturing module is connected with the three-phase voltage phase angle capturing module and the series PFC topological structures and is formed by mutually connecting a phase-locked loop and a PLL; the system is used for completing zero-crossing detection of the power grid voltage; the phase-locked loop is used for regulating and controlling the anti-interference state of the PLL;
a three-phase voltage phase angle capturing module; the system is connected with a bidirectional switch PWM driving signal generating module and the serial PFC topological structures and used for judging phase limits and generating 30-degree pulses; performing high-frequency PWM detection within a 30-degree pulse range;
the bidirectional switch PWM driving signal generating module is connected with the three-phase voltage phase angle capturing module and is used for driving the bidirectional switch to be switched on and off by amplifying, isolating and amplifying the high-frequency PWM signal which is connected with a gate pole G of the bidirectional switch PWM driving signal generating module; while being used to pass the detected output voltage VdcThe value of (d) adjusts the duty cycle of the PWM signal.
6. The control system of the three-switch tube three-phase PFC circuit of claim 5, wherein the bidirectional switch PWM drive signal generation module comprises:
the voltage stress of the bidirectional switch PWM driving signal generation module is expressed as:
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| CN112271920A (en) * | 2020-11-16 | 2021-01-26 | 江西清华泰豪三波电机有限公司 | Bridgeless PFC circuit based on three-phase coupling inductor |
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