CN112636578B - PFC circuit and noise reduction circuit - Google Patents

PFC circuit and noise reduction circuit Download PDF

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Publication number
CN112636578B
CN112636578B CN202011414529.XA CN202011414529A CN112636578B CN 112636578 B CN112636578 B CN 112636578B CN 202011414529 A CN202011414529 A CN 202011414529A CN 112636578 B CN112636578 B CN 112636578B
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diode
terminal device
capacitor
pfc circuit
circuit
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CN112636578A (en
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邓谷城
钟诗豪
章文凯
李薛山
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GD Midea Air Conditioning Equipment Co Ltd
Foshan Shunde Midea Electric Science and Technology Co Ltd
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GD Midea Air Conditioning Equipment Co Ltd
Foshan Shunde Midea Electric Science and Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4241—Arrangements for improving power factor of AC input using a resonant converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The embodiment of the invention discloses a PFC circuit, which comprises: the four-terminal device comprises a four-terminal device, a first capacitor and a first inductor; the four-terminal device includes: a switching tube and a diode; the first end of the switching tube is connected with the anode of the diode; the first end of the switching tube forms the first end of the four-terminal device; the second end of the switching tube forms the second end of the four-terminal device; the third end of the switching tube forms the third end of the four-terminal device; the cathode of the diode forms the fourth terminal of the four-terminal device; the first end of the four-terminal device is connected with the first inductor; the third end of the four-end device is used for being connected with a power supply; the four-terminal device, the first inductor and the power supply form a loop; a first capacitor is connected between the third end and the fourth end of the four-end device; if the switch tube is conducted, the power supply charges the first inductor; if the switch tube is cut off, the first inductor discharges. The PFC circuit of the embodiment of the invention utilizes the four-terminal device to replace the switch tube and the diode which are originally connected in the PFC circuit, thereby shortening the connecting line of the switch tube and the diode and further reducing the electromagnetic interference of the PFC circuit.

Description

PFC circuit and noise reduction circuit
Technical Field
The invention relates to the technical field of electronics, in particular to a PFC circuit and a noise reduction circuit.
Background
Currently, a Power Factor Correction (PFC) circuit is usually used to adjust an input current of a Power supply for a variable frequency controller, so that a phase of the input current is the same as a phase of an output voltage. Wherein, the PFC circuit mainly includes: a single PFC circuit, a two-way interleaved PFC circuit, a three-way interleaved PFC circuit, a bridgeless PFC circuit, and the like.
In the PFC circuit, there are basically high-frequency power devices such as a diode, an Insulated Gate Bipolar Transistor (IGBT), an Oxide-Semiconductor Field-Effect Transistor (MOSFET), and a PFC inductor. When the high-frequency power devices are in a high-frequency operating state, Electromagnetic Interference (EMI) is easily generated; it may contaminate peripheral equipment or the power grid.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a PFC circuit and a noise reduction circuit.
The technical scheme of the embodiment of the invention is realized as follows:
a PFC circuit, the PFC circuit comprising: the four-terminal device comprises a four-terminal device, a first capacitor and a first inductor;
the four-terminal device includes: a switching tube and a diode; the first end of the switching tube is connected with the anode of the diode;
the first end of the switching tube forms the first end of the four-terminal device; the second end of the switching tube forms the second end of the four-terminal device; the third end of the switching tube forms the third end of the four-terminal device; the cathode of the diode forms the fourth terminal of the four-terminal device;
the first end of the four-terminal device is connected with the first inductor; the third end of the four-end device is used for being connected with a power supply; the four-terminal device, the first inductor and the power supply form a loop; the first capacitor is connected between the third end and the fourth end of the four-end device;
if the switch tube is conducted, the power supply charges the first inductor; and if the switching tube is cut off, the first inductor discharges.
In the above scheme, the switch tube includes: an MOS tube;
the drain electrode of the MOS tube is connected with the anode of the diode;
the drain electrode of the MOS tube forms a first end of the four-end device; the grid electrode of the MOS tube forms a second end of the four-end device; and the source electrode of the MOS tube forms a third end of the four-end device.
In the above scheme, the switch tube includes: an IGBT;
the collector of the IGBT is connected with the anode of the second diode;
the collector electrode of the IGBT forms a first end of the four-terminal device; the grid electrode of the IGBT forms a second end of the four-end device; the emitter of the IGBT forms a third terminal of the four-terminal device.
In the foregoing solution, the four-terminal device further includes:
a second capacitor; the branch of the second capacitor is connected in parallel to a branch of a connecting line of the first end of the switching tube and the anode of the diode; the second capacitor is used for suppressing the resonant frequency generated by the PFC circuit.
In the foregoing solution, the four-terminal device further includes:
the first resistor is connected in series on a branch circuit of the second capacitor; the first resistor and the second capacitor are used together for inhibiting the resonant frequency generated by the PFC circuit.
In the foregoing solution, the PFC circuit further includes:
an absorption circuit; the branch of the absorption circuit is connected in parallel to a branch of a connecting line of a first end and a fourth end of the four-end device; the absorption circuit is used for suppressing the resonant frequency generated by the PFC circuit.
In the above aspect, the absorption circuit includes:
a second capacitor;
or,
a second capacitor and a first resistor; wherein the second capacitor is connected in series with the first resistor.
An embodiment of the present invention further provides a noise reduction circuit, where the noise reduction circuit includes: a PFC circuit and an absorption circuit;
the PFC circuit includes: the first capacitor, the first inductor, the switching tube and the diode;
the first end of the switching tube is connected with the first inductor; the third end of the switch tube is used for being connected with a power supply; the first inductor, the switching tube and the power supply form a loop;
the first end of the switching tube is also connected with the anode of the diode; the first capacitor is connected between the cathode of the diode and the third end of the switch tube;
and the branch of the absorption circuit is connected in parallel with a branch of a connecting line of the first end of the switching tube and the anode of the diode and is used for inhibiting the resonant frequency generated by the PFC circuit.
In the above aspect, the absorption circuit includes:
a second capacitor;
or,
a second capacitor and a first resistor; wherein the second capacitor is connected in series with the first resistor.
In the above scheme, the switch tube includes: an MOS tube; the drain electrode of the MOS tube is connected with the anode of the diode; the drain electrode of the MOS tube is also connected with the first inductor, the grid electrode of the MOS tube is used for being connected with the power supply, and the first capacitor is connected between the source electrode of the MOS tube and the cathode of the diode;
or,
the switch tube comprises: an IGBT; wherein a collector of the IGBT is connected with an anode of the diode; the collector electrode of the IGBT is also connected with the first inductor, and the grid electrode of the MOS tube is used for being connected with the power supply; the first capacitor is connected between the emitter of the IGBT and the cathode of the diode.
The PFC circuit provided by the embodiment of the invention comprises a four-terminal device, wherein the four-terminal device integrates the functional characteristics of a switching tube and a diode, and the four-terminal device is used for replacing the switching tube and the diode in the PFC circuit in the prior art; namely, the embodiment of the invention uses a four-terminal device integrated by a switch tube and a diode to replace the switch tube and the diode which are independently connected in the PFC circuit in the prior art. Therefore, the length of a connecting line between the switching tube and the diode can be shortened, and the parasitic inductance of the connecting line between the switching tube and the anode of the diode is reduced; the invention can reduce the resonance frequency generated by the PFC circuit, so that the output voltage and the output current of the PFC circuit are more stable; further, electromagnetic interference and the like generated by the PFC circuit can be reduced.
In addition, in the embodiment of the invention, the original circuit connection mode of the PFC circuit can be changed as far as possible, and only the four-terminal device integrating the performances of the switching tube and the diode replaces the switching tube and the diode in the PFC circuit, so that the scheme is simple and easy to realize.
The noise reduction circuit provided by the embodiment of the invention comprises an absorption circuit, wherein a branch of the absorption circuit is connected in parallel with a branch of a connecting line of a first end of a switching tube of a PFC circuit and an anode of a diode, so that the resonance frequency of the PFC circuit can be inhibited, at least an output circuit of the switching tube and the resonance frequency generated by a parasitic inductance between the switching tube and the connecting line of the diode can be inhibited, the output voltage and the output current of the PFC circuit can be more stable, and the electromagnetic interference generated by the PFC circuit can be reduced.
Drawings
Fig. 1 is a schematic diagram of a PFC circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of voltage and current waveforms of a PFC circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a PFC circuit according to an embodiment of the present invention;
fig. 4 is a schematic waveform diagram of a voltage and a current at a node 2 of a PFC circuit according to an embodiment of the present invention;
fig. 5 is a schematic waveform diagram of a voltage and a current at a node 3 of a PFC circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a PFC circuit according to an embodiment of the present invention;
fig. 7 is a waveform diagram of a voltage and a current at a node 1 of a PFC circuit according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a PFC circuit according to an embodiment of the present invention.
Fig. 9 is a schematic structural diagram of an optional PFC circuit according to an embodiment of the present invention.
Fig. 10 is a schematic diagram of a PFC circuit according to an embodiment of the present invention.
Fig. 11 is a schematic diagram of a PFC circuit according to an embodiment of the present invention.
Fig. 12 is a schematic diagram of a PFC circuit according to an embodiment of the present invention.
Fig. 13 is a schematic diagram of a PFC circuit according to an embodiment of the present invention.
Fig. 14 is a schematic diagram of a PFC circuit according to an embodiment of the present invention.
Fig. 15 is a schematic diagram of a PFC circuit according to an embodiment of the present invention.
Fig. 16 is a schematic diagram of a PFC circuit according to an embodiment of the present invention.
Fig. 17 is a schematic diagram of a PFC circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In some application scenarios, as the PFC circuit shown in fig. 1, a current meter AM1, an AM2, and an AM3, and a voltage meter VM1 and a voltage meter VM2 are disposed in the PFC circuit; the waveforms of the current meter and the voltage meter are shown in FIG. 2. In fig. 2, the voltage measured by VM2 is the voltage across the power device T1, the current measured by AM2 is the branch current of the power device T1, and the current measured by AM3 is the current of the branch of the power device T1 and the diode.
In other applications, such as the PFC circuit shown in fig. 3, if the power device T1 is close to the inductor L0 and far from the diode D0, parasitic inductance is generated at the node 2 and the node 3. If the parasitic inductance is placed in the analog manner at node 2 or node 3 of the PFC, the waveforms measured by the current meters AM2, AM3 and the inductance meter VM2 in the PFC circuit are shown in fig. 4 and 5, respectively. The parasitic inductances at nodes 2 and 3 will cause the current and voltage of the PFC circuit to resonate.
As shown in the PFC circuit of fig. 6, if the power device T1 is close to the diode D0 and far away from the inductor L0, parasitic inductance is generated at the node 1 and the node 2. If the parasitic inductance is placed in the simulation at the node 1 or the node 2, the waveforms measured by the current meters AM2, AM3 and the inductance meter VM2 in the PFC circuit are as shown in fig. 7 or fig. 5, respectively. The parasitic inductance at the node 1 has little influence on the current and the voltage of the PFC circuit, and resonance basically does not occur; the parasitic inductance at node 2 causes the current and voltage of the PFC circuit to resonate.
As shown in the PFC circuit of fig. 8, if the power device T1 and the diode D0 are placed close to each other, so that the connection between T1 and D0 is shortened as much as possible, a parasitic inductance will be generated at the node 1. If the parasitic inductance is placed in the node 1 in an analog manner, the waveforms measured by the current meters AM2 and AM3 and the inductance meter VM2 in the PFC circuit are shown in fig. 7. The parasitic inductance at node 1 has no effect on the current and voltage of the PFC circuit and substantially no resonance occurs.
In the above related application scenario, if parasitic inductances are placed at the nodes 2 and 3 in an analog manner, the parasitic inductances have an influence on the current and the voltage of the PFC circuit, so that the waveforms of the current and the voltage are resonant. The resonances mainly originate from the parasitic inductances generated by the power device T1 in the PFC and the connection between the power device T1 and the diode.
The embodiment of the invention provides a PFC circuit, which comprises a four-terminal device, wherein the four-terminal device comprises a switching tube and a diode, and replaces the switching tube and the diode in the original PFC circuit; namely, the four-terminal device integrated by the switching tube and the diode is used for replacing the switching tube and the diode which are connected with the wiring of the PFC circuit in the prior art. Therefore, the invention can shorten the length of the connecting line between the switch tube and the anode of the diode, thereby at least partially solving the problem of resonant frequency generated by parasitic inductance existing in the connecting line between the switch tube and the anode of the diode in the application scene, and enabling the output voltage and the output current of the PFC circuit to be more stable; further, electromagnetic interference and the like generated by the PFC circuit can be reduced.
As shown in fig. 9, an embodiment of the present invention provides a PFC circuit, where the PFC circuit includes: a four-terminal device 11, a first capacitor 12 and a first inductor 13;
the four-terminal device 11 comprises: a switching tube 111 and a diode 112; the first end 1111 of the switching tube 111 is connected to the anode of the diode 112;
the first terminal of the switching tube 111 forms the first terminal 1111 of the four-terminal device 11; the second terminal of the switch tube 111 forms the second terminal 1112 of the four-terminal device 11; the third terminal of the switching tube 111 forms the third terminal 1113 of the four-terminal device 11; the cathode of the diode 112 forms the fourth terminal 1114 of the four-terminal device 11;
the first terminal 1111 of the four-terminal device 11 is connected to the first inductor 13; the third end 1113 of the four-end device 11 is used for connecting with a power supply; the four-terminal device 11, the first inductor 13 and the power supply form a loop; the first capacitor 12 is connected between the third terminal 1113 and the fourth terminal 1114 of the four-terminal device 11;
if the switch tube 111 is turned on, the power supply charges the first inductor 13; if the switch tube 111 is turned off, the first inductor 13 discharges.
The four-terminal device disclosed by the embodiment of the invention is suitable for various PFC circuits. For example, the four-terminal device is not only suitable for a BOOST type PFC circuit as shown in fig. 1, but also can be any other FPC circuit; for example, the circuit can be a buck PFC circuit, a boost buck PFC circuit; for another example, the PFC circuit may be a single PFC circuit, a two-way interleaved PFC circuit, a three-way interleaved PFC circuit, a bridgeless PFC circuit, a topology circuit of the above circuits, and the like; the type of the PFC circuit, or the included components and the connection relation are not limited, and the four-terminal device can replace a switching tube and a diode in the PFC circuit.
For example, as shown in FIG. 10, a schematic diagram of a four terminal device is provided. In fig. 10, the first terminal of the switching tube 111 is actually the first terminal 1111 of the four-terminal device 11, the second terminal of the switching tube 111 is actually the second terminal 1112 of the four-terminal device 11, and the third terminal of the switching tube 111 is actually the third terminal 1113 of the four-terminal device 11; the first end 1111 of the switching tube is close to the anode of the diode 112, or the first end 1111 of the switching tube and the anode of the diode 112 are multiplexed into one end; the cathode of the diode 112 is effectively the fourth terminal 1114 of the four terminal device 11.
In the embodiment of the invention, the common separation devices of the switch tube and the diode in the PFC circuit are actually combined into a four-terminal device. The switching tube is a three-terminal device, for example, it can be an IGBT, an MOS tube, a triode, etc.; the diode here may be a boost diode or the like. Therefore, the length of the connecting line between the switch tube and the diode can be shortened.
In the embodiment of the present invention, the power supply connected to the first inductor may be an ac power supply; such as 220V ac power, 360 ac power, etc. Of course, in other embodiments, a rectifying circuit and an inverter circuit may be further disposed between the power supply and the first inductor, wherein the rectifying circuit may convert an ac signal output by the power supply into a dc signal, and the inverter circuit may convert a dc signal output by the rectifying circuit into an ac signal, so as to reduce harmonics of an input current.
In the embodiment of the invention, a second end (for example, a gate of the MOS transistor) of the switching transistor is connected to a driving circuit or a driving power supply; the driving circuit or the driving power supply can generate a driving signal; the cooling circuit or the driving power supply is used for adjusting the on-off frequency of the switching tube so as to adjust the working frequency of the switching tube. The PFC circuit enables the phases of the current and the voltage to be in the same phase, and can also be realized by adjusting the working frequency of the switching tube based on a driving circuit or a driving power supply.
The PFC circuit provided by the embodiment of the invention comprises a four-terminal device, wherein the four-terminal device integrates the functional characteristics of a switching tube and a diode, and replaces the switching tube and the diode in the original PFC circuit; namely, the embodiment of the invention uses a four-terminal device integrated by a switch tube and a diode to replace the switch tube and the diode which are independently connected in the PFC circuit in the prior art. Therefore, the length of a connecting line between the switching tube and the diode can be shortened, and the parasitic inductance of the connecting line between the switching tube and the anode of the diode is reduced; the invention can reduce the resonance frequency generated by the PFC circuit, so that the output voltage and the output current of the PFC circuit are more stable; further, electromagnetic interference and the like generated by the PFC circuit can be reduced.
In addition, in the embodiment of the invention, the original circuit connection mode of the PFC circuit can be not changed as much as possible, and only the four-terminal device integrating the performances of the switching tube and the diode replaces the switching tube and the diode in the PFC circuit, so that the scheme is simple and easy to realize.
Of course, in other embodiments, when the PFC circuit is wired, for example, in the PCB wiring, if the switching tube is close to the diode, the connection between the switching tube and the diode can be shortened, so that the first resonant frequency caused by the parasitic inductance generated between the switching tube and the diode can be reduced to some extent.
It can be understood that the electromagnetic interference generated by the PFC circuit refers to the interference of the resonance generated by the PFC circuit when the PFC circuit converts the voltage or current at a high frequency. For example, the resonant frequency may be generated when the output capacitance of the switching tube itself and the parasitic inductance generated by the connection line between the switching tube and the diode are operated at high frequency.
For example, in one application scenario, the output capacitance existing inside the device of the switching tube in the PFC circuit is: the Coes ═ C1+ C2, wherein the C1 is an equivalent capacitance between a first end and a second end of the switching tube, and the C2 is an equivalent capacitance between the second end and a third end of the switching tube. For example, if the switching transistor is a MOS transistor, the C1 is an equivalent capacitance between a drain and a gate of the MOS transistor, and the C2 is an equivalent capacitance between the gate and a source. The parasitic inductance generated by the connection line between the switch tube and the diode is as follows: ls ═ K × (L + D + H); wherein, K is an equivalent coefficient; l is the length of a connecting line between the switch tube and the diodes, D is the width of the connecting line between the switch tube and the diodes, and H is the thickness of the connecting line between the diodes of the switch tube. The thickness here may be, for example, a copper foil thickness. For example, in one embodiment, L-17 mm, D-3 mm, and H-1 mm. At high frequency voltage or current, the resonance frequency generated by Coes and Ls is
Figure BDA0002817138810000091
In the embodiment of the present invention, the four-terminal device in the PFC circuit replaces the switching tube and the diode, so that the influence of the parasitic inductance Ls generated by the connection line between the switching tube and the diode on the resonance generated by the PFC circuit can be at least reduced.
As shown in fig. 11, in some embodiments, the switching tube 111 includes: an MOS tube;
the drain electrode (D) of the MOS tube is connected with the anode of the diode 112;
the drain (D) of the MOS transistor forms the first end 1111 of the four-terminal device 11; the gate (G) of the MOS transistor forms the second end 1112 of the four-terminal device 11; the source (S) of the MOS transistor forms the third terminal 1113 of the four-terminal device 11.
The MOS tube can be various types of MOS tubes; for example, the transistors may be N-channel MOS transistors, P-channel depletion MOS transistors, N-channel enhancement MOS transistors, P-channel enhancement MOS transistors, and the like.
The MOS tube can generate pulse voltages with different frequencies based on the driving signal.
In some embodiments, the drain of the MOS transistor is the anode of the diode.
In the embodiment of the present invention, the three-terminal device in the four-terminal device may be an MOS transistor; thus, the embodiment of the invention can reach very high working frequency, for example, dozens of MHZ.
As shown in fig. 12, in other embodiments, the switching tube 111 includes: an IGBT;
the collector (C) of the IGBT is connected with the anode of the second diode 112;
the collector (C) of the IGBT forms the first terminal 1111 of the four-terminal device 11; the gate (G) of the IGBT forms the second terminal 1112 of the four-terminal device 11; the emitter (E) of the IGBT forms the third terminal 1113 of the four-terminal device 11.
The IGBT is a composite fully-controlled voltage-driven power semiconductor device consisting of a BJT (bipolar junction transistor) and an MOS (insulated gate field effect transistor). The IGBT herein is of various types; for example, an N-type IGBT or a P-type IGBT may be used.
In some embodiments, the collector of the IGBT is the anode of the diode.
In the embodiment of the invention, the three-terminal device in the four-terminal device can be an IGBT. Therefore, the PFC provided by the embodiment of the invention has the advantages of high input impedance of the MOS tube and low conduction voltage drop of the power transistor; the PFC circuit can be operated in a high-voltage and/or high-current application scenario.
Of course, in other embodiments, the switch tube 111 in the four-terminal device 11 may also be another device with a switch conducting function, for example, a transistor. For example, in other embodiments, the switch tube comprises a transistor; the collector (c) of the triode is connected with the anode of the diode; a collector (c) of the triode forms a first terminal of the four-terminal device; the base (b) of the triode forms the second end of the four-terminal device; and the emitter (e) of the triode forms the third end of the four-end device.
As shown in fig. 13, in some embodiments, the four-terminal device 11 further includes:
a second capacitor 113; a branch of the second capacitor 113 is connected in parallel to a branch of a connection line between the first end 1111 of the switching tube 111 and the anode of the diode 112; the second capacitor 113 is used for suppressing the resonant frequency generated by the PFC circuit.
The second capacitance here is a matching capacitance. For example, the resonant frequency generated by the PFC circuit is generated by Ls between the internal output capacitor Coes of the switching tube and the diode, and then the second capacitor is a matching capacitor between the Coes and the Ls; and the capacitive reactance value of the second capacitor is set at least for partially or completely offsetting the resonance frequency generated by the Coes and the Ls.
In the embodiment of the invention, a loop is formed by the second capacitor, the output capacitor of the switching tube and the parasitic inductance generated by the connection line of the switching tube and the diode; therefore, the resonant frequency of the loop of the PFC circuit can be eliminated as far as possible by setting the impedance of the second capacitor to be matched with the impedance of the output capacitor and the impedance of the parasitic inductor.
In the embodiment of the present invention, a branch including a second capacitor may be connected in parallel to a branch connecting a first end and a fourth end of the four-terminal device, so that the second capacitor can at least partially or completely cancel a resonant frequency generated by an output capacitor of the switching tube and a parasitic inductance of a connection line between the switching tube and the diode, thereby suppressing the resonant frequency of the PFC; thereby achieving the effect of reducing the EMI of PFC.
In some embodiments, as shown in fig. 14, the four-terminal device 11 further includes:
a first resistor 114 connected in series to a branch of the second capacitor 113; the first resistor 114 and the second capacitor 113 are used together to suppress the resonant frequency generated by the PFC circuit.
The first resistor is connected in series with the second capacitor to form an RC absorption circuit.
The first resistor can play a damping role, and can prevent the second capacitor from being damaged by overvoltage or overcurrent of the second capacitor due to oscillation when the PFC circuit works at high frequency. Because the switch tube and the diode are also in the loop of the first resistor and the second capacitor, the first resistor can also reduce the condition that the switch tube or the diode is damaged due to overvoltage or overcurrent caused by oscillation when the switch tube or the diode works at high frequency due to the PFC circuit.
In the embodiment of the present invention, the second capacitor and the first resistor may not only suppress the resonant frequency of the PFC circuit, but also include the second capacitor via the first resistor, so as to reduce the loss of the second capacitor and the like to the transistor due to overvoltage or overcurrent.
In the above embodiments, the absorption circuit including the second capacitor, or the absorption circuit including the second capacitor and the first resistor may be integrated into a four-terminal device; therefore, on the premise of ensuring that the connecting line between the switching tube and the diode is as short as possible, the absorption circuit can be packaged in the four-terminal device without adding extra components; the PFC circuit is simplified to a certain extent.
As shown in fig. 15, in some embodiments, the PFC circuit further includes:
an absorption circuit 14; the branch of the absorption circuit 14 is connected in parallel to the branch of the line connecting the first terminal 1111 and the fourth terminal 1114 of the four-terminal device 11; the absorption circuit 11 is configured to suppress a resonant frequency generated by the PFC circuit.
In some embodiments, the absorption circuit 14 includes: a second capacitor 113.
In another embodiment, the absorption circuit 14 includes: a second capacitor 113 and a first resistor 114; wherein the second capacitor 113 is connected in series with the first resistor 114.
In the embodiment of the invention, a loop is formed by the second capacitor, the output capacitor of the switching tube and the parasitic inductance generated by the connection line of the switching tube and the diode; therefore, the resonant frequency of the loop of the PFC circuit can be eliminated as far as possible by setting the impedance of the second capacitor to be matched with the impedance of the output capacitor and the impedance of the parasitic inductor.
In the embodiment of the invention, the four-terminal device can be used for replacing a switching tube and a diode which are originally connected in the PFC circuit, so that the resonance frequency generated by the parasitic inductance of a connecting line between the switching tube and the diode can be at least partially or completely reduced. The resonant frequency generated by the parasitic inductance and the output capacitance of the switching tube can be at least partially offset or completely offset by connecting an absorption circuit in parallel with a branch of a connecting line of the first end and the fourth end of the four-terminal device. Therefore, the embodiment of the invention can greatly reduce the resonant frequency of the PFC circuit and reduce the EMI of the PFC circuit.
Furthermore, if the absorption circuit comprises the first resistor, the damage to the second capacitor, the switch tube and the diode caused by the high-frequency operation of the PFC circuit can be at least reduced.
In the embodiment, an absorption circuit can be added at the periphery of the four-terminal device to suppress the resonant frequency of the PFC circuit, so that the flexible configuration of the PFC circuit can be realized.
As shown in fig. 16, an embodiment of the present invention further provides a noise reduction circuit, where the noise reduction circuit includes: PFC circuit 10 and absorption circuit 14;
the PFC circuit 10 includes: a first capacitor 12, a first inductor 13, a switch tube 111 and a diode 112;
the first end 1111 of the switching tube 111 is connected to the first inductor 13; the third end 1113 of the switching tube 111 is used for connecting with a power supply; the first inductor 13, the switching tube 111 and the power supply form a loop;
the first end 1111 of the switching tube 111 is further connected to an anode of the diode 112; the first capacitor 12 is connected between the cathode of the diode 112 and the third terminal of the switching tube 111;
the branch of the absorption circuit 12 is connected in parallel to the branch of the connection between the first end 1111 of the switch tube 111 and the anode of the diode 112, and is used for suppressing the resonant frequency generated by the PFC circuit 10.
Of course, in other embodiments, the PFC circuit may be the PFC circuit of any of the embodiments described above; for example, a PFC circuit including a four-terminal device.
The noise reduction circuit provided by the embodiment of the invention comprises an absorption circuit, wherein a branch of the absorption circuit is connected in parallel with a branch of a connecting line of a first end of a switching tube of a PFC circuit and an anode of a diode, so that the resonance frequency of the PFC circuit can be inhibited, at least an output circuit of the switching tube and the resonance frequency generated by a parasitic inductance between the switching tube and the connecting line of the diode can be inhibited, the output voltage and the output current of the PFC circuit can be more stable, and the electromagnetic interference generated by the PFC circuit can be reduced.
In some embodiments, the absorption circuit comprises:
a second capacitor;
or,
a second capacitor and a first resistor; wherein the second capacitor is connected in series with the first resistor.
In some embodiments, the switching tube comprises: an MOS tube; the drain electrode of the MOS tube is connected with the anode of the diode; the drain electrode of the MOS tube is further connected with the first inductor, the grid electrode of the MOS tube is used for being connected with the power supply, and the first capacitor is connected between the source electrode of the MOS tube and the cathode of the diode.
In other embodiments, the switching tube includes: an IGBT; wherein a collector of the IGBT is connected with an anode of the diode; the collector electrode of the IGBT is also connected with the first inductor, and the grid electrode of the MOS tube is used for being connected with the power supply; the first capacitor is connected between the emitter of the IGBT and the cathode of the diode.
In the embodiment of the invention, if the switch tube is an MOS tube, the PFC circuit can be applied to a very high frequency application scene, for example, a scene of tens of MHZ; if the switch tube is an IGBT, the PFC circuit can be applied to a high-frequency application scene of very high voltage or very high current.
Specific examples are provided below in connection with any of the embodiments described above:
as shown in fig. 17, an embodiment of the invention provides a PFC circuit, which includes a four-terminal device 11, a first capacitor 12, and a first inductor 13;
the four-terminal device 11 comprises: a MOS transistor 111, a diode 112, a second capacitor 113, and a first resistor 114;
the drain (D) of the MOS tube 111 is connected with the anode of the diode 112; the drain (D) of the MOS transistor 111 forms the first end 1111 of the four-terminal device 11; the gate (G) of the MOS transistor 111 is connected to the second terminal 1112 of the four-terminal device 11; the source (S) of the MOS transistor 111 forms the third terminal 1113 of the four-terminal device 11; the cathode of the diode 112 forms the fourth terminal 1114 of the four-terminal device 11;
the second capacitor 113 is connected with the first resistor 114; a branch of the second capacitor 113 connected in series with the first resistor 114 is connected in parallel to a branch of a connection line between the drain (D) of the MOS transistor 111 and the anode of the diode 112;
the first terminal 1111 of the four-terminal device 11 is connected to the first inductor 13; the third end 1113 of the four-end device 11 is used for connecting with a power supply; the four-terminal device 11, the first inductor 13 and the power supply form a loop; the first capacitor 12 is connected between the third terminal 1113 and the fourth terminal 1114 of the four-terminal device 11.
In the embodiment of the present invention, if the MOS transistor 111 is turned on, the power supply charges the first inductor 13; if the MOS transistor 111 is turned off, the first inductor 13 discharges; and in the process of switching on and switching off the MOS tube, the second capacitor and the first resistor are used for inhibiting the resonant frequency of the PFC circuit.
The PFC circuit provided by the embodiment of the invention comprises a four-terminal device, wherein the four-terminal device integrates the functional characteristics of an MOS (metal oxide semiconductor) tube and a diode, and replaces the MOS tube and the diode in the original PFC circuit; namely, the embodiment of the invention uses a four-terminal device integrated by an MOS tube and a diode to replace the MOS tube and the diode which are independently connected in the PFC circuit in the prior art. Therefore, the length of a connecting line between the MOS tube and the diode can be shortened, and parasitic inductance existing in the connecting line between the MOS tube and the anode of the diode is reduced; the invention can reduce the resonance frequency generated by the PFC circuit, so that the output voltage and the output current of the PFC circuit are more stable; further, EMI generated by the PFC circuit can be reduced.
Furthermore, the four-terminal device further comprises a branch circuit which is connected in parallel with the low-voltage end of the MOS tube and the anode connecting line of the diode and is connected in parallel with the branch circuit, wherein the branch circuit comprises a second capacitor and a first resistor in series, so that the second capacitor can at least partially offset or completely offset the resonant frequency generated by the output capacitor of the MOS tube and the parasitic inductance of the connecting line between the MOS tube and the diode, thereby further inhibiting the resonant frequency of the PFC and further reducing the EMI of the PFC.
In the embodiment of the present invention, the first resistor may further include the second capacitor, and the second capacitor, the MOS transistor, and the diode may be reduced from damage to the transistor due to an overvoltage or an overcurrent caused by the high-frequency operation of the PFC circuit.
In the embodiment of the invention, the four-terminal device integrating the performance of the MOS tube and the diode is only used for replacing the MOS tube and the diode in the PFC circuit; and integrating a snubber circuit (e.g., a branch of the first electrical bank in series with the second capacitor) in the four-terminal device. Therefore, on the premise of ensuring that the connecting line between the MOS tube and the diode is as short as possible and absorbing the resonance frequency generated by the PFC circuit through the absorption circuit, no additional component is required to be added, and the original circuit connection mode of the PFC circuit is not changed as much as possible, so that the PFC circuit is simple and easy to realize.
Features disclosed in several of the product embodiments provided in the present application may be combined in any combination to yield new product embodiments without conflict.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (9)

1. A PFC circuit, comprising: the four-terminal device comprises a four-terminal device, a first capacitor and a first inductor;
the four-terminal device includes: a switching tube and a diode; the first end of the switching tube is connected with the anode of the diode;
the first end of the switching tube forms the first end of the four-terminal device; the second end of the switching tube forms the second end of the four-terminal device; the third end of the switching tube forms the third end of the four-terminal device; the cathode of the diode forms the fourth terminal of the four-terminal device;
the first end of the four-terminal device is connected with the first inductor; the third end of the four-end device is used for being connected with a power supply; the four-terminal device, the first inductor and the power supply form a loop; the first capacitor is connected between the third end and the fourth end of the four-end device;
if the switch tube is conducted, the power supply charges the first inductor; if the switching tube is cut off, the first inductor discharges;
the four-terminal device further comprising:
a second capacitor; the branch of the second capacitor is connected in parallel to a branch of a connecting line of the first end of the switching tube and the anode of the diode; the second capacitor is used for suppressing the resonant frequency generated by the PFC circuit.
2. The PFC circuit of claim 1, wherein the switching tube comprises: an MOS tube;
the drain electrode of the MOS tube is connected with the anode of the diode;
the drain electrode of the MOS tube forms a first end of the four-end device; the grid electrode of the MOS tube forms a second end of the four-end device; and the source electrode of the MOS tube forms a third end of the four-end device.
3. The PFC circuit of claim 1, wherein the switching tube comprises: an IGBT;
the collector electrode of the IGBT is connected with the anode of the diode;
the collector electrode of the IGBT forms a first end of the four-terminal device; the grid electrode of the IGBT forms a second end of the four-end device; and the emitter of the IGBT forms a third end of the four-end device.
4. The PFC circuit of claim 1, wherein the four terminal device further comprises:
the first resistor is connected in series on a branch circuit of the second capacitor; the first resistor and the second capacitor are used for inhibiting the resonant frequency generated by the PFC circuit.
5. The PFC circuit of any of claims 1 to 3, further comprising:
an absorption circuit; the branch of the absorption circuit is connected in parallel to a branch of a connecting line of a first end and a fourth end of the four-end device; the absorption circuit is used for inhibiting the resonant frequency generated by the PFC circuit.
6. The PFC circuit of claim 5, wherein the snubber circuit comprises:
a second capacitor;
or,
a second capacitor and a first resistor; wherein the second capacitor is connected in series with the first resistor.
7. A noise reduction circuit, comprising: a PFC circuit and an absorption circuit;
the PFC circuit includes: the first capacitor, the first inductor, the switching tube and the diode;
the first end of the switching tube is connected with the first inductor; the third end of the switch tube is used for being connected with a power supply; the first inductor, the switching tube and the power supply form a loop;
the first end of the switching tube is also connected with the anode of the diode; the first capacitor is connected between the cathode of the diode and the third end of the switching tube;
and the branch of the absorption circuit is connected in parallel with a branch of a connecting line of the first end of the switching tube and the anode of the diode and is used for inhibiting the resonant frequency generated by the PFC circuit.
8. The noise reduction circuit of claim 7, wherein the absorption circuit comprises:
a second capacitor;
or,
a second capacitor and a first resistor; wherein the second capacitor is connected in series with the first resistor.
9. The noise reduction circuit according to claim 7 or 8,
the switch tube comprises: an MOS tube; the drain electrode of the MOS tube is connected with the anode of the diode; the drain electrode of the MOS tube is also connected with the first inductor, the grid electrode of the MOS tube is used for being connected with the power supply, and the first capacitor is connected between the source electrode of the MOS tube and the cathode of the diode;
or,
the switch tube includes: an IGBT; wherein a collector of the IGBT is connected with an anode of the diode; the collector electrode of the IGBT is also connected with the first inductor, and the grid electrode of the MOS tube is used for being connected with the power supply; the first capacitor is connected between the emitter of the IGBT and the cathode of the diode.
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