CN102412740A - Multiphase AC-DC (alternating current-direct current) isolating conversion circuit and multiphase AC-DC power supply - Google Patents
Multiphase AC-DC (alternating current-direct current) isolating conversion circuit and multiphase AC-DC power supply Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a multiphase AC-DC (alternating current-direct current) isolating conversion circuit which is connected between an alternating current power supply and a load, wherein the circuit comprises a filter, an active FPC (flexible printed circuit), an LC resonant isolating conversion circuit and a controller, wherein the filter is connected with the alternating current power supply and provides multiphase alternating current for filtering; the active FPC circuit is connected with the output end of the filter and performs rectification and power factor correction on the multiphase alternating current so as to generate the first direct current voltage; the LC resonant isolating conversion circuit is connected with the output end of the active FPC circuit and performs isolating conversion on the first direct current voltage so as to generate the second direct current voltage and supplies power for the load; and the controllers control and regulate the active FPC circuit and the LC resonant isolating conversion circuit. After the active FPC circuit and the LC resonant isolating conversion circuit are controlled and regulated by the controller, the output voltage or output current can be output stably, isolation is realized, the power factor and efficiency are higher, the voltage stress of each switch pipe is lower, low cost is easy to be realized, and the high-power output can be realized.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a multiphase AC-DC isolation conversion circuit and a multiphase AC-DC power supply.
Background
At present, most of widely applied multiphase AC-DC conversion circuits are composed of a rectifying circuit and a DC-DC conversion circuit, wherein the rectifying circuit realizes filtering and AC-DC rectifying functions, and the DC-DC conversion circuit realizes transformation, voltage stabilization and isolation functions. The existing multiphase AC-DC conversion circuit needs to be rectified by a rectifying circuit firstly and then converted, so that the power factor and the efficiency of the circuit are greatly reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing an AC-DC isolation conversion circuit with higher circuit efficiency and power factor and a multiphase AC-DC power supply aiming at the defects of low power factor and efficiency of the multiphase AC-DC conversion circuit in the prior art.
One of the technical schemes adopted by the invention for solving the technical problems is as follows: constructing a multiphase AC-DC isolated converter circuit for connection between an AC power source and a load, the multiphase AC-DC isolated converter circuit including a filter connected to the AC power source for filtering multiphase AC power provided by the AC power source, and further including:
the active FPC circuit is connected with the output end of the filter and used for rectifying the multi-phase alternating current and correcting the power factor to generate a first direct-current voltage;
the LC resonance isolation conversion circuit is connected with the output end of the active FPC circuit and is used for carrying out isolation conversion on the first direct current voltage so as to generate a second direct current voltage and directly supply power to a load;
and the controller is used for controlling and adjusting the active FPC circuit and the LC resonance isolation conversion circuit.
In the multiphase AC-DC isolation conversion circuit, the active FPC circuit comprises a plurality of paths of BUCK circuits which are respectively connected with the multiphase alternating current output end of the filter and are mutually connected in parallel.
In the multiphase AC-DC isolation conversion circuit, each BUCK circuit comprises a first high-frequency rectifying diode, a second high-frequency rectifying diode, a third high-frequency rectifying diode, a fourth high-frequency rectifying diode, a first switching tube, a freewheeling diode, a first freewheeling inductor and an energy storage capacitor, wherein a first alternating current output end of the filter is connected with the cathode of the first high-frequency rectifying diode and the anode of the third high-frequency rectifying diode, the anode of the first high-frequency rectifying diode is connected with the anode of the second high-frequency rectifying diode, the cathode of the third high-frequency rectifying diode is connected with the cathode of the fourth high-frequency rectifying diode, the cathode of the second high-frequency rectifying diode is connected with the anode of the fourth high-frequency rectifying diode through the first freewheeling inductor and the energy storage capacitor in sequence, the source electrode of the first switching tube is connected with the anode of the second high-frequency rectifying diode, the drain electrode of the first switching tube is connected to the cathode of the fourth high-frequency rectifying diode, the grid electrode of the first switching tube is connected to the controller, the anode of the freewheeling diode is connected with the anode of the fourth high-frequency rectifying diode, and the cathode of the freewheeling diode is connected with the cathode of the second high-frequency rectifying diode;
the negative electrodes of the second high-frequency rectifying diodes of each BUCK circuit are connected, the positive electrodes of the fourth high-frequency rectifying diodes of each BUCK circuit are connected, and the freewheeling diode, the first freewheeling inductor and the energy storage capacitor are shared by the multiple BUCK circuits.
In the multiphase AC-DC isolation conversion circuit, each BUCK circuit also comprises a second follow current inductor, and the cathode of a second high-frequency rectifying diode is connected to the anode of a fourth high-frequency rectifying diode sequentially through the first follow current inductor, the energy storage capacitor and the second follow current inductor.
In the multiphase AC-DC isolation conversion circuit, the LC resonance isolation conversion circuit comprises a square wave generating circuit, a resonance inductor, a resonance capacitor, a transformer, a rectification circuit and an output capacitor, wherein a first input end and a second input end of the square wave generating circuit are respectively connected with the positive end and the negative end of the energy storage capacitor, a first output end of the square wave generating circuit is connected with a second output end of the square wave generating circuit sequentially through the resonance inductor, the primary side of the transformer and the resonance capacitor respectively, one end of the primary side of the transformer, which is connected with the resonance inductor, is the same-name end of the primary side of the transformer, one end of the primary side of the transformer, which is connected with the resonance capacitor, is the different-name end of the primary side of the transformer, the same-name end of the secondary side of the transformer is connected with the input positive end of the rectification circuit, and the different-name, the output positive end of the rectifying circuit is connected with the positive pole of the load, the output negative end of the rectifying circuit is connected with the negative pole of the load, and the output capacitor is connected between the output positive end and the output negative end of the rectifying circuit.
In the multiphase AC-DC isolation conversion circuit, the square wave generating circuit comprises a second switching tube, a third switching tube, a fourth switching tube and a fifth switching tube, wherein the drain electrode of the second switching tube is connected to the anode of the energy storage capacitor, the source electrode of the second switching tube is connected to the drain electrode of the third switching tube, the source electrode of the third switching tube is connected to the cathode of the energy storage capacitor, the drain electrode of the fourth switching tube is connected to the anode of the energy storage capacitor, the source electrode of the fourth switching tube is connected to the drain electrode of the fifth switching tube, the source electrode of the fifth switching tube is connected to the cathode of the energy storage capacitor, the source electrode of the second switching tube is a first output end of the square wave generating circuit, and the source electrode of the fourth switching tube is a second output end of the square wave generating circuit;
and the grid electrode of the second switching tube, the grid electrode of the third switching tube, the grid electrode of the fourth switching tube and the grid electrode of the fifth switching tube are connected to the controller.
In the multiphase AC-DC isolation conversion circuit, the square wave generating circuit comprises a second switching tube, a third switching tube, a first capacitor and a second capacitor, wherein the drain electrode of the second switching tube is connected to the anode of the energy storage capacitor, the source electrode of the second switching tube is connected to the drain electrode of the third switching tube, the source electrode of the third switching tube is connected to the cathode of the energy storage capacitor, the anode of the energy storage capacitor is connected to the cathode of the energy storage capacitor sequentially through the first capacitor and the second capacitor, the source electrode of the second switching tube is a first output end of the square wave generating circuit, and the node of the first capacitor and the second capacitor is a second output end of the square wave generating circuit;
the grid electrode of the second switching tube and the grid electrode of the third switching tube are both connected to the controller.
In the multiphase AC-DC isolated conversion circuit, the rectifying circuit is a rectifying bridge formed by four diodes, the input positive end of the rectifying bridge is the input positive end of the rectifying circuit, the input negative end of the rectifying bridge is the input negative end of the rectifying circuit, the output positive end of the rectifying bridge is the output positive end of the rectifying circuit, and the output negative end of the rectifying bridge is the output negative end of the rectifying circuit.
In the multiphase AC-DC isolation conversion circuit, the rectification circuit comprises a sixth switching tube and a seventh switching tube, the drain electrode of the sixth switching tube is connected to the positive electrode of the output capacitor, the source electrode of the sixth switching tube is connected to the drain electrode of the seventh switching tube, the source electrode of the seventh switching tube is connected to the negative electrode of the output capacitor, the drain electrode of the eighth switching tube is connected to the positive electrode of the output capacitor, the source electrode of the eighth switching tube is connected to the drain electrode of the ninth switching tube, the source electrode of the ninth switching tube is connected to the negative electrode of the output capacitor, the source electrode of the sixth switching tube is the positive input end of the rectifying circuit, the source electrode of the eighth switching tube is the negative input end of the rectifying circuit, the drain electrode of the sixth switching tube is the positive output end of the rectifying circuit, and the source electrode of the ninth switching tube is the negative output end of the rectifying circuit;
and the grid electrode of the sixth switching tube, the grid electrode of the seventh switching tube, the grid electrode of the eighth switching tube and the grid electrode of the ninth switching tube are all connected to the controller.
The second technical scheme adopted by the invention for solving the technical problems is as follows: a multiphase AC-DC power supply is constructed, which comprises a multiphase AC-DC isolation conversion circuit, wherein the multiphase AC-DC isolation conversion circuit is the multiphase AC-DC isolation conversion circuit in one of the technical schemes.
The multiphase AC-DC isolation conversion circuit and the multiphase AC-DC power supply have the following beneficial effects:
firstly, after the active PFC circuit and the LC resonance isolation conversion circuit are controlled and adjusted by the controller, voltage or current can be stably output, isolation is realized, the power factor and efficiency are high, the voltage stress of each switching tube is low, low cost is easy to realize, and high-power output can be realized;
secondly, the active PFC circuit provides a first direct current voltage for the LC resonance isolation conversion circuit as an input voltage, and the controller can adjust the active PFC circuit according to the requirement of the LC resonance isolation conversion circuit so as to maintain a high-efficiency working point;
thirdly, as the active FPC circuit adopts a BUCK structure, the voltage stress of the switch devices of the active FPC circuit and the LC resonance isolation conversion circuit is small, and the switch devices with low voltage and low on-resistance can be adopted, so that the cost is saved, and the efficiency is kept high.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a functional block diagram of a multiphase AC-DC isolated converter circuit of the present invention;
FIG. 2 is a circuit diagram of a first embodiment of a multiphase AC-DC isolated converter circuit of the present invention;
FIG. 3 is a circuit diagram of a second embodiment of the multiphase AC-DC isolated converter circuit of the present invention;
FIG. 4 is a circuit diagram of a third embodiment of the multiphase AC-DC isolated converter circuit of the present invention;
FIG. 5 is a circuit diagram of a fourth embodiment of the multiphase AC-DC isolated converter circuit of the present invention;
fig. 6 is a circuit diagram of a fifth embodiment of the multiphase AC-DC isolated converter circuit of the present invention.
Detailed Description
Fig. 1 is a schematic block diagram of a multiphase AC-DC isolated converter circuit according to the present invention. The multiphase AC-DC isolation conversion circuit is connected between an alternating current power supply and a load and comprises a filter 1, an active FPC circuit 2, an LC resonance isolation conversion circuit 3 and a controller 4. Wherein,
the filter 1 is connected with an alternating current power supply and is used for filtering multiphase alternating current provided by the alternating current power supply;
the active FPC circuit 2 is connected with the output end of the filter 1, and rectifies the multi-phase alternating current and corrects the power factor to generate a first direct current voltage;
the LC resonance isolation conversion circuit 3 is connected with the output end of the active FPC circuit 2, and is used for carrying out isolation conversion on the first direct current voltage so as to generate a second direct current voltage and directly supply power to a load;
the controller 4 controls and adjusts the active FPC circuit 2 and the LC resonance isolation conversion circuit 3.
Therefore, after the active PFC circuit 2 and the LC resonance isolation conversion circuit 3 are controlled and adjusted by the controller 4, voltage or current can be stably output, isolation is realized, the power factor and efficiency are high, the voltage stress of each switching tube is low, low cost is easy to realize, and high-power output can be realized; in addition, the active PFC circuit 2 provides the LC resonant isolation conversion circuit 3 with a first direct current voltage as an input voltage, and the controller 4 may adjust the active PFC circuit 2 according to the needs of the LC resonant isolation conversion circuit 3 to maintain a high-efficiency operating point.
Fig. 2 is a circuit diagram of a first embodiment of the multiphase AC-DC isolated converter circuit of the present invention. In the first embodiment, three-phase ac power is taken as an example for explanation:
the active FPC circuit 2 comprises three paths of BUCK circuits which are respectively connected with the three-phase alternating current output ends of the filter 1 and are mutually connected in parallel.
The first path of BUCK circuit comprises a first high-frequency rectifying diode Da1, a second high-frequency rectifying diode Da2 and a third high-frequency rectifying diode Da3And a fourth high-frequency rectifying diode Da4A first switch tube Qa, a freewheeling diode D, a first freewheeling inductor L1And an energy storage capacitor C1The first-phase AC output of the filter 1 is rectified by a first high-frequency rectifierDiode Da1And a third high-frequency rectifying diode Da3Are connected to each other, a first high-frequency rectifying diode Da1And the second high-frequency rectifying diode Da2Is connected to the anode of a third high-frequency rectifying diode Da3And the fourth high-frequency rectifying diode Da4Is connected to the negative pole of a second high-frequency rectifying diode Da2The negative electrode of the first flywheel inductor L is sequentially connected with the first flywheel inductor L1And an energy storage capacitor C1Connected to a fourth high-frequency rectifying diode Da4A source of the first switching tube Qa is connected to the second high frequency rectifying diode Da2The drain of the first switching tube Qa is connected to the fourth high-frequency rectifying diode Da4The grid electrode of the first switching tube Qa is connected to the controller 4, the anode electrode of the freewheeling diode D and the fourth high-frequency rectifying diode Da4Is connected to the anode thereof, and the cathode thereof is connected to a second high-frequency rectifying diode Da2Are connected with each other.
The second path of BUCK circuit comprises a first high-frequency rectifying diode Db1A second high-frequency rectifying diode Db2And a third high-frequency rectifying diode Db3A fourth high-frequency rectifying diode Db4A first switch tube QbA freewheeling diode D, a first freewheeling inductor L1And an energy storage capacitor C1The connection relationship is the same as that of the first path of BUCK circuit, and is not described in detail.
The third BUCK circuit comprises a first high-frequency rectifying diode Dc1A second high-frequency rectifier diode Dc2, a third high-frequency rectifier diode Dc3A fourth high-frequency rectifying diode Dc4A first switch tube Qc, a freewheeling diode D, a first freewheeling inductor L1And an energy storage capacitor C1The connection relation is also the same as that of the first path of BUCK circuit.
The second high-frequency rectifying diodes Da in the first path of BUCK, the second path of BUCK and the third path of BUCK2A second high-frequency rectifying diode Db2And a second high-frequency rectifying diode Dc2Are connected with each other, and a fourth high-frequency rectifying diode Da4A fourth high-frequency rectifying diodeDb4And a fourth high-frequency rectifying diode Dc4The anodes of the two are connected, and a freewheeling diode D and a first freewheeling inductor L are connected1And an energy storage capacitor C1Is shared by the three BUCK circuits.
The LC resonance isolation conversion circuit 3 comprises a square wave generating circuit, a resonance inductor Lr, a resonance capacitor Cr, a transformer Lm, a rectification circuit and an output capacitor C2The first and second input ends of the square wave generating circuit are respectively connected with the energy storage capacitor C1The first output end of the square wave generating circuit is connected to the second output end of the square wave generating circuit sequentially through the resonant inductor Lr, the primary side of the transformer Lm and the resonant capacitor Cr, the end, connected with the resonant inductor Lr, of the primary side of the transformer Lm is the dotted end of the primary side of the transformer Lm, the end, connected with the resonant capacitor Cr, of the primary side of the transformer Lm is the dotted end of the primary side of the transformer Lm, the dotted end of the secondary side of the transformer Lm is connected with the input positive end of the rectifying circuit, the dotted end of the secondary side of the transformer Lm is connected with the input negative end of the rectifying circuit, the output positive end of the rectifying circuit is connected with the positive electrode of the load, the output negative end of the rectifying circuit is connected with the negative electrode of the load, and the output capacitor C2 is connected between the output positive end and the output negative.
The square wave generating circuit comprises a second switch tube QahAnd a third switch tube Qa1And a fourth switching tube QbhAnd a fifth switching tube Qb1A second switch tube QahIs connected to the energy storage capacitor C1Positive electrode of (1), second switching tube QahIs connected to the third switch tube Qa1The drain electrode of (1), the third switching tube Qa1Is connected to the energy storage capacitor C1Negative electrode of (1), fourth switching tube QbhIs connected to the energy storage capacitor C1Positive electrode of (1), fourth switching tube QbhIs connected to the fifth switching tube Qb1Drain electrode of (1), fifth switching tube Qb1Is connected to the energy storage capacitor C1Negative electrode of (1), second switching tube QahThe source electrode of the first switching tube is the first output end of the square wave generating circuit, and the fourth switching tube QbhThe source of the second switching circuit is a second output end of the square wave generating circuit; second switch tube QahGrid and third switch tube Qa1Grid and a fourth switching tube QbhGrid and a fifth switching tube Qb1Are connected to the controller 4.
The rectification circuit is composed of four diodes (D)1、D2、D3And D4) The input positive end I + of the rectifier bridge is the input positive end of the rectifier circuit, the input negative end I-of the rectifier bridge is the input negative end of the rectifier circuit, the output positive end O + of the rectifier bridge is the output positive end of the rectifier circuit, and the output negative end O-of the rectifier bridge is the output negative end of the rectifier circuit.
The controller 4 adjusts the duty ratio of the output square wave control signal according to the current of the multiphase alternating current input end provided by the alternating current power supply by adopting a specific control algorithm to control the three first switching tubes (Qa, Q)bAnd Qc) switching on or off to achieve the purposes of stabilizing the bus voltage and correcting the input power factor. The LC resonance isolation conversion circuit 3 realizes the second switching tube Qa by delaying the current of the resonance inductor Lr by LC resonancehAnd a third switch tube Qa1And a fourth switching tube QbhAnd a fifth switching tube Qb1The soft switch is used for realizing zero current turn-off of the rectifying circuit by natural commutation of an LC resonant cavity formed by the resonant inductor Lr and the resonant capacitor Cr, thereby achieving high efficiency and realizing isolated output.
Because the output bus voltage of the active FPC circuit 2 is adjustable, the LC resonance isolation conversion circuit 3 can adopt high-efficiency simple SRC (series resonance), namely when Lr is less than Lm, the series resonance is formed, which can be equivalent to that a load is connected with the LC resonance cavity in series, the impedance of the load is 1/(j omega C) + j omega L, and the impedance is adjusted through a second switching tube Qa of a bridge armhAnd a third switch tube Qa1And a fourth switching tube QbhAnd a fifth switching tube Qb1When the switching frequency omega is equal to the resonant frequency of the LC resonant cavity, the voltages of all bridge arms are applied to the load, and at the moment, the output power is outputThe voltage is highest, the reactive power in the LC resonant cavity is least, the efficiency of the circuit is highest, and the gain is not more than 1 all the time.
In other embodiments, the LC resonant isolated conversion circuit 3 may also use LLC, the control method is substantially the same as SRC, since the inductor of the transformer Lm also participates in resonance, there are two resonance points, the gain may be greater than 1, wide output voltage is easily realized, and the switching frequency variation range is relatively small, zero current turn-off of Zero Voltage Switch (ZVS) and rectifier tube of the rectifier circuit is realized over the entire load range, maintaining high efficiency.
Further, three first switching tubes (Qa, Q)bAnd Qc) can be kept at the resonant frequency point, and the energy storage capacitor C is adjusted1Voltage on the capacitor, thereby regulating the final output capacitance C2The voltage at the two ends is stabilized.
In the multiphase AC-DC isolated conversion circuit according to the first embodiment, only one freewheeling inductor, i.e., the first freewheeling inductor L, is used in the active FPC circuit 21。
In the invention, the active FPC circuit 2 adopts a BUCK structure, the voltage stress of the switch devices of the active FPC circuit 2 and the LC resonance isolation conversion circuit 3 is smaller, and the switch devices with low voltage and low on resistance can be adopted, so that the cost is saved and the efficiency is kept high.
Fig. 3 is a circuit diagram of a second embodiment of the multiphase AC-DC isolated converter circuit of the present invention. The second embodiment differs from the first embodiment shown in fig. 2 in that: each path of BUCK circuit also comprises a second follow current inductor L2Second high frequency rectifier diode Da2The negative electrode of the first flywheel inductor L is sequentially connected with the first flywheel inductor L1And an energy storage capacitor C1And a second freewheeling inductor L2To the anode of the fourth high-frequency rectifying diode Da 4.
In the multiphase AC-DC isolated conversion circuit of the second embodiment, the active FPC circuit 2 employs two free-wheeling inductors, i.e., the first free-wheeling inductor L1And a second freewheeling inductor L2。
Fig. 4 is a circuit diagram of a third embodiment of the multiphase AC-DC isolated converter circuit of the present invention. The third embodiment differs from the second embodiment shown in fig. 3 in that: the rectification circuit comprises a sixth switching tube Q6Seventh switch tube Q7The eighth switch tube Q8And a ninth switching tube Q9The sixth switching tube Q6Is connected to the output capacitor C2Positive electrode of (1), sixth switching tube Q6Is connected to the seventh switching tube Q7Drain electrode of (1), seventh switching tube Q7Is connected to the output capacitor C2Negative electrode of (1), eighth switching tube Q7Is connected to the output capacitor C2Positive electrode of (1), eighth switching tube Q8Is connected to the ninth switching tube Q9The ninth switching tube Q9Is connected to the output capacitor C2Negative electrode of (1), sixth switching tube Q6The source electrode of the rectifier circuit is the input positive end I + of the rectifier circuit, and the eighth switching tube Q8The source electrode of the rectifier circuit is the input negative terminal I-, and a sixth switching tube Q6The drain electrode of the rectifier circuit is the output positive end O +, and the ninth switching tube Q9The source electrode of the rectifier circuit is the output negative end O < - >; sixth switching tube Q6Grid and seventh switch tube Q7Grid and eighth switching tube Q8Grid and ninth switching tube Q9Are connected to the controller 4.
In the multiphase AC-DC isolation conversion circuit of the third embodiment, the rectifying circuit in the LC resonance isolation conversion circuit 3 adopts the synchronous rectification technology, so that the bidirectional flow of energy is realized, and the conversion efficiency of the LC resonance isolation conversion circuit 3 is further improved.
Fig. 5 is a circuit diagram of a fourth embodiment of the multiphase AC-DC isolated converter circuit of the present invention. The fourth embodiment differs from the second embodiment shown in fig. 3 in that: the square wave generating circuit comprises a second switch tube QahAnd a third switch tube Qa1A first capacitor C1-1And a second capacitor C1-2Second openingClosing pipe QahIs connected to the energy storage capacitor C1Positive electrode of (1), second switching tube QahIs connected to the third switch tube Qa1The drain electrode of (1), the third switching tube Qa1Is connected to the energy storage capacitor C1The negative electrode of (1), the energy storage capacitor C1In turn passes through the first capacitor C1-1And a second capacitor C1-2Is connected to the energy storage capacitor C1Negative electrode of (1), second switching tube QahThe source of the first capacitor C is a first output end of the square wave generating circuit1-1And a second capacitor C1-2The node of (a) is a second output end of the square wave generating circuit; second switch tube QahGate and third switching tube Qa1Are connected to the controller 4.
In the multiphase AC-DC isolated conversion circuit of the fourth embodiment, the square wave generating circuit in the LC resonant isolated conversion circuit 3 adopts a half-bridge conversion mode, so that a large current can be output, and the control mode of the controller 4 is simple.
In other embodiments, when the rectifying circuit in the LC resonant isolated conversion circuit 3 needs a very wide voltage output, the square wave generating circuit can be switched from full-bridge conversion to half-bridge operation, and the transformer Lm can use a relay conversion turn ratio, so as to maintain high efficiency during high power output.
Fig. 6 is a circuit diagram of a fifth embodiment of the multiphase AC-DC isolated converter circuit of the present invention. The multiphase AC-DC isolation converter circuit of the fifth embodiment uses multiphase alternating current (Ua, U)b.... Un) includes a plurality of BUCK circuits respectively connected to the polyphase ac output terminals of the filter and connected in parallel to each other. Therefore, the multiphase AC-DC isolation conversion circuit is suitable for any multiphase alternating current power supply situation.
In addition, the present invention further relates to a multi-phase AC-DC power supply, wherein the multi-phase AC-DC power supply adopts the multi-phase AC-DC isolation conversion circuit described in each of the above embodiments, and details regarding a specific implementation of the multi-phase AC-DC isolation conversion circuit are not described herein again.
In summary, in the multiphase AC-DC isolation conversion circuit and the multiphase AC-DC power supply of the present invention, after the active PFC circuit 2 and the LC resonance isolation conversion circuit 3 are controlled and adjusted by the controller 4, the output voltage or the output current can be stabilized, isolation is achieved, the power factor and efficiency are high, the voltage stress of each switching tube is low, low cost is easy to achieve, and high power output can be achieved; in addition, the active PFC circuit 2 provides the LC resonant isolation conversion circuit 3 with a first dc voltage as an input voltage, and the controller 4 can adjust the active PFC circuit according to the needs of the LC resonant isolation conversion circuit 3 to maintain an efficient operating point.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A multiphase AC-DC isolating converter circuit connected between an AC power source and a load, the multiphase AC-DC isolating converter circuit comprising a filter connected to the AC power source for filtering multiphase AC power provided by the AC power source, the multiphase AC-DC isolating converter circuit further comprising:
the active FPC circuit is connected with the output end of the filter and used for rectifying the multi-phase alternating current and correcting the power factor to generate a first direct-current voltage;
the LC resonance isolation conversion circuit is connected with the output end of the active FPC circuit and is used for carrying out isolation conversion on the first direct current voltage so as to generate a second direct current voltage and directly supply power to a load;
and the controller is used for controlling and adjusting the active FPC circuit and the LC resonance isolation conversion circuit.
2. The isolated multiphase AC-DC converter circuit as recited in claim 1, wherein the active FPC circuit comprises multiple BUCK circuits respectively connected to the multiphase AC output terminals of the filter and connected in parallel with each other.
3. The multiphase AC-DC isolated conversion circuit according to claim 2, wherein each BUCK circuit comprises a first high-frequency rectifying diode, a second high-frequency rectifying diode, a third high-frequency rectifying diode, a fourth high-frequency rectifying diode, a first switching tube, a freewheeling diode, a first freewheeling inductor and an energy storage capacitor, an AC output end of the filter is connected with a cathode of the first high-frequency rectifying diode and an anode of the third high-frequency rectifying diode, an anode of the first high-frequency rectifying diode is connected with an anode of the second high-frequency rectifying diode, a cathode of the third high-frequency rectifying diode is connected with a cathode of the fourth high-frequency rectifying diode, a cathode of the second high-frequency rectifying diode is connected with an anode of the fourth high-frequency rectifying diode through the first freewheeling inductor and the energy storage capacitor in sequence, a source of the first switching tube is connected with an anode of the second high-frequency rectifying diode, the drain electrode of the first switching tube is connected to the cathode of the fourth high-frequency rectifying diode, the grid electrode of the first switching tube is connected to the controller, the anode of the freewheeling diode is connected with the anode of the fourth high-frequency rectifying diode, and the cathode of the freewheeling diode is connected with the cathode of the second high-frequency rectifying diode;
the negative electrodes of the second high-frequency rectifying diodes of each BUCK circuit are connected, the positive electrodes of the fourth high-frequency rectifying diodes of each BUCK circuit are connected, and the freewheeling diode, the first freewheeling inductor and the energy storage capacitor are shared by the multiple BUCK circuits.
4. The multiphase AC-DC isolated conversion circuit according to claim 3, wherein each BUCK circuit further comprises a second freewheeling inductor, and the cathode of the second high-frequency rectifying diode is connected to the anode of the fourth high-frequency rectifying diode sequentially through the first freewheeling inductor, the energy storage capacitor and the second freewheeling inductor.
5. The multiphase AC-DC isolation converting circuit according to claim 2 or 3, wherein said LC resonance isolation converting circuit comprises a square wave generating circuit, a resonance inductor, a resonance capacitor, a transformer, a rectifying circuit and an output capacitor, wherein a first input terminal and a second input terminal of said square wave generating circuit are respectively connected to two positive and negative terminals of said energy storage capacitor, a first output terminal of said square wave generating circuit is connected to a second output terminal of said square wave generating circuit sequentially through said resonance inductor, a primary terminal of the transformer and the resonance capacitor, respectively, one end of the primary terminal of the transformer connected to the resonance inductor is a synonym terminal of the primary terminal of the transformer, one end of the primary terminal of the transformer connected to the resonance capacitor is a synonym terminal of the primary terminal of the transformer, the synonym terminal of the secondary terminal of the transformer is connected to the input terminal of said rectifying circuit, and the synonym terminal of the secondary terminal of the transformer is connected to the input terminal of said, the output positive end of the rectifying circuit is connected with the positive pole of the load, the output negative end of the rectifying circuit is connected with the negative pole of the load, and the output capacitor is connected between the output positive end and the output negative end of the rectifying circuit.
6. The multiphase AC-DC isolated conversion circuit according to claim 5, wherein the square wave generation circuit comprises a second switching tube, a third switching tube, a fourth switching tube and a fifth switching tube, the drain electrode of the second switching tube is connected to the positive electrode of the energy storage capacitor, the source electrode of the second switching tube is connected to the drain electrode of the third switching tube, the source electrode of the third switching tube is connected to the negative electrode of the energy storage capacitor, the drain electrode of the fourth switching tube is connected to the positive electrode of the energy storage capacitor, the source electrode of the fourth switching tube is connected to the drain electrode of the fifth switching tube, the source electrode of the fifth switching tube is connected to the negative electrode of the energy storage capacitor, the source electrode of the second switching tube is the first output end of the square wave generation circuit, and the source electrode of the fourth switching tube is the second output end of the square wave generation circuit;
and the grid electrode of the second switching tube, the grid electrode of the third switching tube, the grid electrode of the fourth switching tube and the grid electrode of the fifth switching tube are connected to the controller.
7. The multiphase AC-DC isolated conversion circuit according to claim 5, wherein the square wave generation circuit comprises a second switching tube, a third switching tube, a first capacitor and a second capacitor, the drain electrode of the second switching tube is connected to the positive electrode of the energy storage capacitor, the source electrode of the second switching tube is connected to the drain electrode of the third switching tube, the source electrode of the third switching tube is connected to the negative electrode of the energy storage capacitor, the positive electrode of the energy storage capacitor is connected to the negative electrode of the energy storage capacitor through the first capacitor and the second capacitor in sequence, the source electrode of the second switching tube is the first output end of the square wave generation circuit, and the node of the first capacitor and the second capacitor is the second output end of the square wave generation circuit;
the grid electrode of the second switching tube and the grid electrode of the third switching tube are both connected to the controller.
8. The multiphase AC-DC isolated conversion circuit according to claim 5, wherein said rectifying circuit is a rectifying bridge composed of four diodes, the positive input terminal of said rectifying bridge is the positive input terminal of said rectifying circuit, the negative input terminal of said rectifying bridge is the negative input terminal of said rectifying circuit, the positive output terminal of said rectifying bridge is the positive output terminal of said rectifying circuit, and the negative output terminal of said rectifying bridge is the negative output terminal of said rectifying circuit.
9. The multiphase AC-DC isolated conversion circuit of claim 5, the rectifying circuit comprises a sixth switching tube, a seventh switching tube, an eighth switching tube and a ninth switching tube, wherein the drain electrode of the sixth switching tube is connected to the positive electrode of the output capacitor, the source electrode of the sixth switching tube is connected to the drain electrode of the seventh switching tube, the source electrode of the seventh switching tube is connected to the negative electrode of the output capacitor, the drain electrode of the eighth switching tube is connected to the positive electrode of the output capacitor, the source electrode of the eighth switching tube is connected to the drain electrode of the ninth switching tube, the source electrode of the ninth switching tube is connected to the negative electrode of the output capacitor, the source electrode of the sixth switching tube is the positive input end of the rectifying circuit, the source electrode of the eighth switching tube is the negative input end of the rectifying circuit, the drain electrode of the sixth switching tube is the positive output end of the rectifying circuit, and the source electrode of the ninth switching tube is the negative output end of the rectifying circuit;
and the grid electrode of the sixth switching tube, the grid electrode of the seventh switching tube, the grid electrode of the eighth switching tube and the grid electrode of the ninth switching tube are all connected to the controller.
10. A multi-phase AC-DC power supply comprising a multi-phase AC-DC isolated converter circuit, wherein the multi-phase AC-DC isolated converter circuit is the multi-phase AC-DC isolated converter circuit of any one of claims 1 to 9.
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| CN102412740B (en) | 2014-01-29 |
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