CN111600477B - Noise suppression circuit for reinjection cancellation - Google Patents
Noise suppression circuit for reinjection cancellation Download PDFInfo
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- CN111600477B CN111600477B CN202010620391.2A CN202010620391A CN111600477B CN 111600477 B CN111600477 B CN 111600477B CN 202010620391 A CN202010620391 A CN 202010620391A CN 111600477 B CN111600477 B CN 111600477B
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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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention relates to a noise suppression circuit for reinjection cancellation, which comprises a flyback electric energy converter, a noise extraction network and a noise reinjection network, wherein the flyback electric energy converter comprises a transformer and a switching element, and the transformer is coupled with the switching element; the noise extraction network is coupled between the noise reinjection network and the flyback power converter and is used for extracting noise of the switching element; the noise reinjection network is coupled between the noise extraction network and the flyback power converter for injecting the noise into an input path of the flyback power converter. The noise suppression circuit provided by the invention can be used for effectively suppressing the switching noise, is not limited by the cut-off frequency of a conventional EMI filter, does not need to increase the volume and weight of common-mode inductance in the EMI filter, and can be used for reducing the loss of the whole circuit and improving the energy efficiency.
Description
Technical Field
The invention relates to the technical field of electromagnetic noise suppression, in particular to a reinjection cancellation noise suppression circuit.
Background
Flyback power converters are commonly used for low-power conversion, and are used in electrical devices to convert ac or dc power from a front-end circuit into dc power required by a back-end circuit, such as notebook power adapters, mobile phone chargers, and switching power supplies for internal power supply in other electrical devices. The high-frequency switch in the flyback electric energy converter can generate electromagnetic noise during operation, and the electric equipment can be marketed after meeting the electromagnetic noise amplitude requirement required by electromagnetic compatibility regulations, so that an EMI filter is usually added at the input end of the flyback electric energy converter to inhibit the electromagnetic noise.
Fig. 1 is a schematic circuit diagram of a flyback power converter with an EMI filter. Referring to fig. 1, an EMI filter 120 is interposed between an ac input and a flyback power converter 110, and the main components of the EMI filter 120 are a common mode inductance L and a filter capacitance C. Typically, the 1-stage common mode inductance and filter capacitance form a 1-stage 2-stage filter attenuation, with a filter cut-off frequency of
The filter can suppress frequencies greater than the filter cut-off frequency f c The attenuation characteristic is 40dB/10 octave. By adjusting the cut-off frequency f of the filter c To suppress noise at different frequencies. However, as can be derived from the formula of the cut-off frequency, the cut-off frequency f of the filter c In inverse square relation with inductance of common-mode inductance L, when cut-off frequency f c When 50% is reduced, the inductance of the common-mode inductor L needs to be increased by 4 times correspondingly, which results in a large increase in the volume of the common-mode inductor L, and simultaneously reduces the energy efficiency of the converter, so that the EMI filter cannot meet the requirements of small volume, light weight and high efficiency of electronic products.
Disclosure of Invention
The invention aims to provide a noise suppression circuit which is not limited by the cut-off frequency and attenuation characteristic of a filter.
The technical scheme adopted by the invention for solving the technical problems is that the noise suppression circuit is characterized by comprising a flyback electric energy converter, a noise extraction network and a noise reinjection network, wherein the flyback electric energy converter comprises a transformer and a switching element, the transformer is coupled with the switching element, the transformer comprises a first winding, a second winding and a third winding, the first winding is positioned at the input end of the transformer, the second winding and the third winding are positioned at the output end of the transformer, the second winding and the third winding are arranged opposite to the first winding, the first end of the first winding is coupled with the noise reinjection network, and the second end of the first winding is coupled with the switching element; the noise extraction network is coupled between the noise reinjection network and the flyback power converter and is used for extracting noise of the switching element, the noise extraction network comprises a first impedance, a first end of the first impedance is coupled with a first end of the third winding, and a second end of the first impedance is coupled with the noise reinjection network; the noise reinjection network is coupled between the noise extraction network and the flyback power converter for injecting the noise into an input path of the flyback power converter, the noise reinjection network comprising a common-mode inductance comprising a fourth winding, a first end of the fourth winding being coupled with the first impedance, a second end of the fourth winding being coupled with a second end of the third winding.
In an embodiment of the invention, the flyback electric energy converter further includes a rectifier bridge, an input end of the rectifier bridge is coupled with the ac power supply, and the noise reinjection network is coupled between an output end positive electrode and an output end negative electrode of the rectifier bridge.
In an embodiment of the invention, the flyback electric energy converter further includes a rectifier bridge, an input end of the rectifier bridge is coupled to the noise reinjection network, an output end positive electrode of the rectifier bridge is coupled to the first end of the first winding, and an output end negative electrode of the rectifier bridge is coupled to the switching element.
In an embodiment of the present invention, the common mode inductor of the noise reinjection network further includes a fifth winding and a sixth winding, where the fifth winding and the fourth winding are on a same side of the common mode inductor, the sixth winding and the fourth winding are on different sides of the common mode inductor, and the fifth winding is disposed opposite to the sixth winding.
In an embodiment of the present invention, a first end of the sixth winding is coupled to one end of a power source, and a second end of the sixth winding is coupled to the flyback power converter; the first end of the fifth winding is coupled with the other end of the power supply, and the second end of the fifth winding is coupled with the switching element.
In an embodiment of the invention, the flyback electric energy converter further includes a rectifier bridge, an input terminal of the rectifier bridge is coupled to the ac power source, an output terminal positive electrode of the rectifier bridge is coupled to the first terminal of the sixth winding, an output terminal negative electrode of the rectifier bridge is coupled to the first terminal of the fifth winding, a second terminal of the sixth winding is coupled to the first terminal of the first winding, and a second terminal of the fifth winding is coupled to the switching element.
In an embodiment of the invention, the flyback electric energy converter further includes a rectifier bridge, wherein an input end of the rectifier bridge is coupled to the second end of the sixth winding and the second end of the fifth winding, respectively, an output positive electrode of the rectifier bridge is coupled to the first end of the first winding, an output negative electrode of the rectifier bridge is coupled to the switching element, the first end of the sixth winding is coupled to one end of the power supply, and the first end of the fifth winding is coupled to the other end of the power supply.
In an embodiment of the invention, the first winding is a primary winding and the second and third windings are secondary windings.
The noise suppression circuit for reinjection cancellation adopts the noise extraction network to synchronously extract the switching noise in the flyback electric energy converter, and the switching noise is reinjected back into the input path of the flyback electric energy converter through the noise reinjection network, so that the effective suppression of the switching noise is realized. According to the noise suppression circuit, the limitation of the cut-off frequency of a conventional EMI filter can be avoided, the volume and the weight of common mode inductance in the EMI filter are not required to be increased, the loss of the whole circuit is reduced, and the energy efficiency is improved.
Drawings
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below, wherein:
FIG. 1 is a schematic diagram of a circuit configuration of a flyback power converter with an EMI filter;
fig. 2 is a schematic diagram of a noise suppression circuit according to a first embodiment of the present invention;
fig. 3 is a schematic diagram of a noise suppression circuit according to a second embodiment of the present invention;
fig. 4 is a schematic diagram of a noise suppression circuit according to a third embodiment of the present invention;
fig. 5 is a schematic diagram of a noise suppression circuit according to a fourth embodiment of the present invention.
Symbol description
110. Flyback electric energy converter
120 EMI filter
210. Flyback electric energy converter
220. Noise extraction network
211. Transformer
212. Switching element
230. Noise reinjection network
240. Power supply
310. First winding
310a first end of the first winding
310b second end of the first winding
320. Second winding
330. Third winding
330a first end of the third winding
330b second end of the third winding
340. First impedance
340a first end of the first impedance
340b second end of the first impedance
350. Fourth winding
350a first end of the fourth winding
350b second end of the fourth winding
360. Fifth winding
360a first end of the fifth winding
360b second end of the fifth winding
370. Sixth winding
370a first end of the sixth winding
370b second end of the sixth winding
410. Rectifier bridge
410a, 410b rectifier bridge input
Output end positive electrode of 410c rectifier bridge
Output terminal negative electrode of 410d rectifier bridge
420. Piezoresistor
C2, C3 capacitor
D1 Diode
F1 Fuse wire
L common mode inductance
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than as described herein, and therefore the present invention is not limited to the specific embodiments disclosed below.
As used in this application and in the claims, the terms "a," "an," "the," and/or "the" are not specific to the singular, but may include the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus.
In addition, the terms "first", "second", etc. are used to define the components, and are merely for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and thus should not be construed as limiting the scope of the present application. Furthermore, although terms used in the present application are selected from publicly known and commonly used terms, some terms mentioned in the specification of the present application may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present application be understood, not simply by the actual terms used but by the meaning of each term lying within.
It will be understood that when an element is referred to as being "on," "connected to," "coupled to," or "contacting" another element, it can be directly on, connected or coupled to, or contacting the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly on," "directly connected to," "directly coupled to," or "directly contacting" another element, there are no intervening elements present. Likewise, when a first element is referred to as being "electrically contacted" or "electrically coupled" to a second element, there are electrical paths between the first element and the second element that allow current to flow. The electrical path may include a capacitor, a coupled inductor, and/or other components that allow current to flow even without direct contact between conductive components.
Fig. 2 is a schematic diagram of a noise suppression circuit according to a first embodiment of the present invention. Referring to fig. 2, the noise suppression circuit of this embodiment includes a flyback power converter 210 (labeled with a dashed box in fig. 2), a noise extraction network 220, and a noise reinjection network 230. The flyback power converter 210 includes a transformer 211 and a switching element 212, wherein the transformer 211 is coupled with the switching element 212. The noise extraction network 220 is coupled between the noise reinjection network 230 and the flyback power converter 210 for extracting noise of the switching element 212. The noise reinjection network 230 is coupled between the noise extraction network 220 and the flyback power converter 210 for injecting noise extracted by the noise extraction network 220 from the switching element 212 into an input path of the flyback power converter 210, thereby eliminating switching noise in the input path.
Referring to fig. 2, a power supply 240 is coupled to the noise reinjection network 230. If the noise extraction network 220 and the noise reinjection network 230 of the present invention are not used, the power supply 240 may be directly coupled to the flyback power converter 210, and the flyback power converter 210 may convert the ac power or dc power provided by the power supply 240 into the dc power required by the subsequent circuit, but the electric device may not meet the requirements of the electromagnetic compatibility regulations due to the electromagnetic noise generated by the switching element 212.
According to the noise suppression circuit for reinjection cancellation, electromagnetic noise of the switching element 212 can be synchronously extracted, and the noise is reversely reinjected into a noise propagation path to be cancelled, so that the limitation of cut-off frequency and attenuation characteristics caused by using an EMI filter is avoided, the size of the filter circuit can be greatly reduced, and the requirements of small size, light weight and high efficiency of electronic products are met.
Fig. 3 is a schematic diagram of a noise suppression circuit according to a second embodiment of the present invention. Referring to fig. 3, in some embodiments illustrated therein, the transformer 211 of the flyback power converter 210 of the present invention includes a first winding 310, a second winding 320, and a third winding 330, a first end 310a of the first winding 310 being coupled to the noise reinjection network 230, a second end 310b of the first winding 310 being coupled to the switching element 212, the second winding 320 and the third winding 330 being disposed opposite the first winding 310. Referring to fig. 3, the first winding 310, the second winding 320 and the third winding 330 are disposed opposite to each other, i.e., at both ends of the transformer core, i.e., the input end and the output end of the transformer, respectively. The first winding 310 is at the input of the transformer 211 and the second winding 320 and the third winding 330 are at the output of the transformer 211.
Note that some electronic components, such as a diode D1, capacitors C2, C3, and the like, are also shown in fig. 3. The arrangement of the number, positions, etc. of specific electronic components in the noise suppression circuit of the present invention shown in fig. 3 is not limited, and those skilled in the art can add necessary electronic components on the basis of the noise suppression circuit of the present invention as needed.
Referring to fig. 3, in this embodiment, the first winding 310 is a primary winding, and the second winding 320 and the third winding 330 are both secondary windings. The second winding 320 may be coupled to outputs, such as output 1 and output 2 in fig. 3; the third winding 330 may be coupled with a control loop. The output terminal of the second winding 320 may further be coupled to electronic components such as a diode D1 and a capacitor C3.
Referring to fig. 3, the switching element 212 in this embodiment is a transistor, such as a MOS transistor. The gate of the transistor may be coupled to a control loop. The second end 310b of the first winding 310 is connected to the drain of the transistor, the source of which is coupled to the noise reinjection network 230 and to the capacitor C2.
According to the embodiment shown in fig. 3, electromagnetic noise generated by the switching element 212 by the high frequency switch can be coupled to the third winding 330, and synchronous coupling can be achieved. Thus, the noise extraction network 220 may extract the noise by coupling with the tertiary winding 330 such that the noise reinjection network 230 further reinjects the noise back into the input path of the flyback power converter 210, thereby canceling electromagnetic noise generated in the input path due to the switching element 212.
Referring to fig. 3, the noise extraction network 220 includes a first impedance 340. The first end 340a of the first impedance 340 is coupled to the first end 330a of the third winding 330, and the second end 340b of the first impedance 340 is coupled to the noise reinjection network 230. In the embodiment shown in fig. 3, the noise extraction network 220 further includes a line to which the second end 330b of the third winding 330 is coupled to the noise reinjection network 230. According to the noise extraction network 220, the high frequency switching noise of the switching element 212 can be extracted synchronously.
Referring to fig. 3, the noise reinjection network 230 includes a common mode inductance L including a fourth winding 350, a first end 350a of the fourth winding 350 being coupled to a second end 340b of the first impedance 340, a second end 350b of the fourth winding 350 being coupled to a second end 330b of the third winding 330.
As shown in fig. 3, in some embodiments, a fifth winding 360 and a sixth winding 370 are also included in noise reinjection network 230, with fifth winding 360 being disposed opposite sixth winding 370. The fourth winding 350, the fifth winding 360, and the sixth winding 370 together constitute a common mode inductance L. As shown in fig. 3, the fifth winding 360 and the fourth winding 350 are on the same side of the common-mode inductance L, and the sixth winding 370 and the fourth winding 350 are on the opposite side of the common-mode inductance L.
In the embodiment shown in fig. 3, the switching element 212 is coupled to the noise reinjection network 230, i.e. the switching element 212 is coupled to the second end 360b of the fifth winding 360. The first end 360a of the fifth winding 360 is coupled to one end of the power supply 240. The second end 370b of the sixth winding 370 is coupled with the flyback power converter 210, in particular, the second end 370b of the sixth winding 370 is coupled with the first end 310a of the first winding 310 in the transformer 211. A first end 370a of the sixth winding 370 is coupled to the other end of the power supply 240.
In the embodiment shown in fig. 3, the power supply 240 is a direct current power supply DC. Therefore, this embodiment is applicable to a flyback power converter of a direct current input. A fuse F1 is also connected between the direct current power supply DC and the first end 370a of the sixth winding 370 in the noise reinjection network 230. In the flyback power converter 210 of this embodiment, a capacitor C2 is further connected between the first end 310a of the first winding 310 and the source pin of the switching element 212. Meanwhile, a capacitor C2 is also connected between the second end 370b of the sixth winding 370 and the second end 360b of the fifth winding 360.
According to the embodiment shown in fig. 3, the electromagnetic noise cancellation effect can be changed by adjusting the magnitude of the first impedance 340 or adjusting the number of turns of the fourth winding 350, so that the electric equipment meets the requirements of the electromagnetic interference regulation limit. The noise suppression circuit is irrelevant to the cut-off frequency of a conventional EMI filter, the volume and the weight of the common-mode inductance L are not required to be increased, the loss of the whole circuit is reduced, and the energy efficiency is improved.
Fig. 4 is a schematic diagram of a noise suppression circuit according to a third embodiment of the present invention. Referring to fig. 4, the power supply 240 in this embodiment employs an alternating current power supply AC. Thus, this embodiment is applicable to an ac input flyback power converter 210. Specifically, in the embodiment shown in fig. 4, an alternating current power source AC is connected in series with the fuse F1 and in parallel with the piezo-resistor 420.
The flyback power converter 210 of the ac input often includes a rectifier circuit, such as rectifier bridge 410 shown in fig. 4. The rectifier bridge 410 may be a rectifier bridge commonly used in the art, such as the rectifier bridge shown in fig. 4, which is composed of four diodes. The rectifier bridge 410 includes two inputs 410a and 410b. The two inputs 410a, 410b are coupled to an alternating current source AC. As shown in fig. 4, two input ends 410a, 410b of the rectifier bridge 410 are coupled to two ends of the varistor 420, respectively. Noise reinjection network 230 is coupled between output positive 410c and output negative 410d of rectifier bridge 410.
Referring to fig. 4, in this embodiment, a flyback power converter 210 includes a transformer 211 and a switching element 212. The transformer 211 comprises a first winding 310, a second winding 320 and a third winding 330, a first end 310a of the first winding 310 being coupled to the noise reinjection network 230, a second end 310b of the first winding 310 being coupled to the switching element 212, both the second winding 320 and the third winding 330 being arranged opposite to the first winding 310. In this embodiment, the first winding 310 is a primary winding, and the second winding 320 and the third winding 330 are both secondary windings. The second winding 320 may be coupled to an output, such as output 1 and output 2 shown in fig. 4; the third winding 330 may be coupled with a control loop. The output terminal of the second winding 320 may further be coupled to electronic components such as a diode D1 and a capacitor C3.
In the embodiment shown in fig. 4, the switching element 212 is a transistor, such as a MOS transistor. The gate of the transistor may be coupled to a control loop. The second end 310b of the first winding 310 is connected to the drain of the transistor, the source of which is coupled to the noise reinjection network 230.
In the embodiment shown in fig. 4, the noise extraction network 220 includes a first impedance 340. The first end 340a of the first impedance 340 is coupled to the first end 330a of the third winding 330, and the second end 340b of the first impedance 340 is coupled to the noise reinjection network 230. In the embodiment shown in fig. 4, the noise extraction network 220 further includes a line to which the second end 330b of the third winding 330 is coupled to the noise reinjection network 230. According to the noise extraction network 220, the high frequency switching noise of the switching element 212 can be extracted synchronously.
In the embodiment shown in fig. 4, the noise reinjection network 230 includes a common mode inductance L including a fourth winding 350, a first end 350a of the fourth winding 350 being coupled to a second end 340b of the first impedance 340, a second end 350b of the fourth winding 350 being coupled to a second end 330b of the third winding 330. Also included in noise reinjection network 230 are a fifth winding 360 and a sixth winding 370, the fifth winding 360 being disposed opposite the sixth winding 370. The fourth winding 350, the fifth winding 360, and the sixth winding 370 together constitute a common mode inductance L. The switching element 212 is coupled to the noise reinjection network 230, i.e. the switching element 212 is coupled to the second end 360b of the fifth winding 360. The first end 360a of the fifth winding 360 is coupled to the output terminal negative pole 410d of the rectifier bridge 410. The second end 370b of the sixth winding 370 is coupled with the flyback power converter 210, in particular, the second end 370b of the sixth winding 370 is coupled with the first end 310a of the first winding 310 in the transformer 211. The first end 370a of the sixth winding 370 is coupled to the output anode 410c of the rectifier bridge 410.
In the embodiment shown in fig. 4, a capacitor C2 is also connected between the first end 310a of the first winding 310 and the source pin of the switching element 212. Meanwhile, a capacitor C2 is also connected between the second end 370b of the sixth winding 370 and the second end 360b of the fifth winding 360.
According to the embodiment shown in fig. 4, by adjusting the size of the first impedance 340 or the number of turns of the fourth winding 350, the electromagnetic noise cancellation effect can be changed, so that the electric equipment meets the requirements of the electromagnetic interference regulation limit. The noise suppression circuit is irrelevant to the cut-off frequency of a conventional EMI filter, the volume and the weight of the common-mode inductance L are not required to be increased, the loss of the whole circuit is reduced, and the energy efficiency is improved.
Fig. 5 is a schematic diagram of a noise suppression circuit according to a fourth embodiment of the present invention. Referring to fig. 5, the power supply 240 in this embodiment employs an alternating current power supply AC. Thus, this embodiment is applicable to an ac input flyback power converter 210. Specifically, in the embodiment shown in fig. 5, an alternating current power source AC is connected in series with the fuse F1 and in parallel with the piezo-resistor 420.
The flyback power converter 210 of the ac input often includes a rectifier circuit, such as rectifier bridge 410 shown in fig. 5. The rectifier bridge 410 may be a rectifier bridge commonly used in the art, such as a rectifier bridge composed of four diodes as shown in fig. 5. In the embodiment shown in fig. 5, the rectifier bridge 410 includes two inputs 410a and 410b. The two inputs 410a, 410b are coupled to the noise reinjection network 230. An output positive electrode 410c of the rectifier bridge 410 is coupled to the first end 310a of the first winding 310, and an output negative electrode 410d of the rectifier bridge 410 is coupled to the switching element 212.
In the embodiment shown in fig. 5, flyback power converter 210 includes a transformer 211 and a switching element 212. The transformer 211 includes a first winding 310, a second winding 320, and a third winding 330, a first end 310a of the first winding 310 is coupled to an output positive pole 410c of the rectifier bridge 410, a second end 310b of the first winding 310 is coupled to the switching element 212, and the second winding 320 and the third winding 330 are disposed opposite to the first winding 310. In this embodiment, the first winding 310 is a primary winding, and the second winding 320 and the third winding 330 are both secondary windings. The second winding 320 may be coupled to an output, such as output 1 and output 2 shown in fig. 5; the third winding 330 may be coupled with a control loop. The output terminal of the second winding 320 may further be coupled to electronic components such as a diode D1 and a capacitor C3.
In the embodiment shown in fig. 5, the switching element 212 is a transistor, such as a MOS transistor. The gate of the transistor may be coupled to a control loop. The second terminal 310b of the first winding 310 is connected to the drain of the transistor, the source of which is coupled to the capacitor C2 and the output terminal negative electrode 410d of the rectifier bridge 410.
In the embodiment shown in fig. 5, the noise extraction network 220 includes a first impedance 340. The first end 340a of the first impedance 340 is coupled to the first end 330a of the third winding 330, and the second end 340b of the first impedance 340 is coupled to the noise reinjection network 230. In the embodiment shown in fig. 5, the noise extraction network 220 further includes a line to which the second end 330b of the third winding 330 is coupled to the noise reinjection network 230. According to the noise extraction network 220, the high frequency switching noise of the switching element 212 can be extracted synchronously.
In the embodiment shown in fig. 5, the noise reinjection network 230 includes a common mode inductance L that includes a fourth winding 350, a first end 350a of the fourth winding 350 being coupled to a second end 340b of the first impedance 340, and a second end 350b of the fourth winding 350 being coupled to a second end 330b of the third winding 330. Also included in noise reinjection network 230 are a fifth winding 360 and a sixth winding 370, the fifth winding 360 being disposed opposite the sixth winding 370. The fourth winding 350, the fifth winding 360, and the sixth winding 370 together constitute a common mode inductance L.
In the embodiment shown in fig. 5, noise reinjection network 230 is coupled between power supply 240 and rectifier bridge 410. The first end 370a of the sixth winding 370 is coupled to the fuse F1 and then connected to the AC power source AC, and the second end 370b of the sixth winding 370 is coupled to the input end 410a of the rectifier bridge 410. The first end 360a of the fifth winding 360 is coupled to the alternating current source AC and the second end 360b of the fifth winding 360 is coupled to the other input 410b of the rectifier bridge 410.
In the embodiment shown in fig. 5, a capacitor C2 is also connected between the first end 310a of the first winding 310 and the source pin of the switching element 212. Meanwhile, a capacitor C2 is also connected between the output positive electrode 410C and the output negative electrode 410d of the rectifier bridge 410.
According to the embodiment shown in fig. 5, by adjusting the size of the first impedance 340 or the number of turns of the fourth winding 350, the electromagnetic noise cancellation effect can be changed, so that the electric equipment meets the requirements of the electromagnetic interference regulation limit. The noise suppression circuit is irrelevant to the cut-off frequency of a conventional EMI filter, the volume and the weight of the common-mode inductance L are not required to be increased, the loss of the whole circuit is reduced, and the energy efficiency is improved.
In embodiments of the present invention, one skilled in the art may add or delete other electronic components and features as needed in addition to the flyback power converter, the noise extraction network, and the noise reinjection network in the noise suppression circuit of the present invention.
While the invention has been described with reference to the specific embodiments presently, it will be appreciated by those skilled in the art that the foregoing embodiments are merely illustrative of the invention, and various equivalent changes and substitutions may be made without departing from the spirit of the invention, and therefore, all changes and modifications to the embodiments are intended to be within the scope of the claims of this application as long as they come within the true spirit of the invention.
Claims (8)
1. A noise suppression circuit for reinjection cancellation is characterized by comprising a flyback power converter, a noise extraction network and a noise reinjection network, wherein,
the flyback electric energy converter comprises a transformer and a switching element, wherein the transformer is coupled with the switching element, the transformer comprises a first winding, a second winding and a third winding, the first winding is positioned at the input end of the transformer, the second winding and the third winding are positioned at the output end of the transformer, the second winding and the third winding are arranged opposite to the first winding, the first end of the first winding is coupled with the noise reinjection network, and the second end of the first winding is coupled with the switching element;
the noise extraction network is coupled between the noise reinjection network and the flyback power converter and is used for extracting noise of the switching element, the noise extraction network comprises a first impedance, a first end of the first impedance is coupled with a first end of the third winding, and a second end of the first impedance is coupled with the noise reinjection network;
the noise reinjection network is coupled between the noise extraction network and the flyback power converter for injecting the noise into an input path of the flyback power converter, the noise reinjection network comprising a common-mode inductance comprising a fourth winding, a first end of the fourth winding being coupled with the first impedance, a second end of the fourth winding being coupled with a second end of the third winding.
2. The noise suppression circuit of claim 1, wherein the flyback power converter further comprises a rectifier bridge, an input of the rectifier bridge coupled to an ac power source, and the noise reinjection network coupled between an output positive pole and an output negative pole of the rectifier bridge.
3. The noise suppression circuit of claim 1, wherein the flyback power converter further comprises a rectifier bridge, an input of the rectifier bridge coupled to the noise reinjection network, an output positive of the rectifier bridge coupled to the first end of the first winding, and an output negative of the rectifier bridge coupled to the switching element.
4. The noise suppression circuit of claim 1, wherein the common mode inductance of the noise reinjection network further comprises a fifth winding and a sixth winding, the fifth winding being on a same side of the common mode inductance as the fourth winding, the sixth winding being on a different side of the common mode inductance than the fourth winding, the fifth winding being disposed opposite the sixth winding.
5. The noise suppression circuit of claim 4, wherein a first end of the sixth winding is coupled to one end of a power source and a second end of the sixth winding is coupled to the flyback power converter; the first end of the fifth winding is coupled with the other end of the power supply, and the second end of the fifth winding is coupled with the switching element.
6. The noise suppression circuit of claim 4, wherein the flyback power converter further comprises a rectifier bridge, an input of the rectifier bridge coupled to an ac power source, an output positive of the rectifier bridge coupled to the first end of the sixth winding, an output negative of the rectifier bridge coupled to the first end of the fifth winding, a second end of the sixth winding coupled to the first end of the first winding, and a second end of the fifth winding coupled to the switching element.
7. The noise suppression circuit of claim 4, wherein the flyback power converter further comprises a rectifier bridge, an input of the rectifier bridge being coupled to the second end of the sixth winding and the second end of the fifth winding, respectively, an output positive of the rectifier bridge being coupled to the first end of the first winding, an output negative of the rectifier bridge being coupled to the switching element, the first end of the sixth winding being coupled to one end of a power supply, the first end of the fifth winding being coupled to the other end of the power supply.
8. The noise suppression circuit of claim 1, wherein the first winding is a primary winding and the second and third windings are secondary windings.
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