CN213305284U - Power conversion circuit, circuit board and air conditioner - Google Patents

Power conversion circuit, circuit board and air conditioner Download PDF

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Publication number
CN213305284U
CN213305284U CN202022319504.3U CN202022319504U CN213305284U CN 213305284 U CN213305284 U CN 213305284U CN 202022319504 U CN202022319504 U CN 202022319504U CN 213305284 U CN213305284 U CN 213305284U
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winding
core
power conversion
circuit
conversion circuit
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黄招彬
徐锦清
岑长岸
谢鸣静
杨土权
赵鸣
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GD Midea Air Conditioning Equipment Co Ltd
Chongqing Midea Refrigeration Equipment Co Ltd
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GD Midea Air Conditioning Equipment Co Ltd
Chongqing Midea Refrigeration Equipment Co Ltd
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Abstract

The utility model discloses a power conversion circuit, circuit board and air conditioner, power conversion circuit include transformer, rectification energy storage circuit and rectification filter circuit. The transformer is provided with a first winding and a second winding, the filter inductor is provided with a third winding, the first winding, the second winding and the third winding are wound on the same magnetic core, the magnetic core is provided with a first core body in a closed shape and a second core body in an open shape, the opening of the second core body faces the first core body, the first winding and the second winding are wound on the first core body, and the third winding is wound on the second core body, so that the first winding, the second winding and the third winding are integrated on the same magnetic core. Based on this, through using filter inductance and transformer in power conversion circuit through the integrated mode of magnetism, this integrated mode of magnetism realizes filter inductance and transformer function unification through the multiplexing realization of magnetic circuit to reduce the magnetic core volume, make whole power conversion circuit can save the space that will occupy.

Description

Power conversion circuit, circuit board and air conditioner
Technical Field
The utility model relates to a but not limited to circuit technical field especially relates to a power conversion circuit, circuit board and air conditioner.
Background
In the related art, the power conversion circuit uses two devices, namely a filter inductor and a transformer, but the filter inductor and the transformer are two independent devices, and the total occupied volume is large, so that the whole power conversion circuit needs to occupy a large space in an applied product, and the trend of pursuing miniaturization of various intelligent products at present is not met.
SUMMERY OF THE UTILITY MODEL
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The embodiment of the utility model provides a power conversion circuit, circuit board and air conditioner can save the space that whole power conversion circuit will occupy.
In a first aspect, an embodiment of the present invention provides a power conversion circuit, including:
a transformer including a first winding and a second winding;
the rectification energy storage circuit is arranged on the input side of the transformer;
the rectification filter circuit is arranged on the output side of the transformer and comprises a filter inductor, and the filter inductor comprises a third winding;
the first winding, the second winding and the third winding are wound on the same magnetic core, the magnetic core comprises a closed first core body and an open second core body, the opening of the second core body faces the first core body, the first winding and the second winding are wound on the first core body, and the third winding is wound on the second core body.
The utility model discloses above-mentioned technical scheme of first aspect has one of following advantage or beneficial effect at least: the utility model discloses power conversion circuit, it includes the transformer, sets up at the rectification tank circuit of transformer input side and sets up at transformer output side rectification filter circuit. The transformer is provided with a first winding and a second winding, the filter inductor is provided with a third winding, the first winding, the second winding and the third winding are wound on the same magnetic core, the magnetic core is provided with a first core body in a closed shape and a second core body in an open shape, the opening of the second core body faces the first core body, specifically, the first winding and the second winding are wound on the first core body, and the third winding is wound on the second core body, so that the first winding, the second winding and the third winding are integrated on the same magnetic core. Based on this, through using filter inductance and transformer in power conversion circuit through the integrated mode of magnetism, this integrated mode of magnetism realizes filter inductance and transformer function unification through the multiplexing realization of magnetic circuit to reduce the magnetic core volume, make whole power conversion circuit can save the space that will occupy.
Optionally, in an embodiment of the present invention, the rectification energy storage circuit includes a first discharge resistor, a second discharge resistor, a first capacitor, a second capacitor, a first MOS transistor, a second MOS transistor, a third diode, a fourth diode, and an energy storage capacitor, the first discharge resistor is connected in parallel with the first capacitor, the second discharge resistor is connected in parallel with the second capacitor, the third diode is connected in reverse parallel with the first MOS transistor, the fourth diode is connected in reverse parallel with the second MOS transistor, the first capacitor is connected in series with the second capacitor to form a first branch, the first MOS transistor is connected in series with the second MOS transistor to form a second branch, the first branch is connected in parallel with the second branch, and the second branch is connected to the input side of the transformer through the energy storage capacitor.
Optionally, in an embodiment of the present invention, the rectifying and filtering circuit includes a first diode, a second diode, a filter inductor and a filter capacitor, the first diode and the second diode constitute a half-bridge rectifying circuit, the half-bridge rectifying circuit passes through the filter inductor the filter capacitor is connected to a load. The rectification filter circuit is arranged on the output side of the transformer, wherein the half-bridge rectification circuit plays a role in rectification in the circuit, and the filter inductor and the filter capacitor play a role in filtering in the circuit.
Optionally, in an embodiment of the present invention, one end of the second core is connected to the first core, and the other end of the second core is provided with a single-segment air gap or a multi-segment air gap; or both ends of the second core body are provided with single-section air gaps; or both ends of the second core are connected with the first core. For the structure of the magnetic core, one end of the second core is connected with the first core, or both ends of the second core are connected with the first core, so as to form a complete closed magnetic circuit. For the arrangement mode of the air gap, a single-section air gap can be arranged at the other end of the second core body, and the single-section air gap is mixed with an air medium, so that the magnetic conductivity is improved and reduced, the magnetic saturation phenomenon is better controlled, and the uniformity of inductance is improved; a plurality of sections of air gaps can be arranged at the other end of the second core body, the width of each section of air gap can be reduced, leakage inductance can be reduced, eddy current loss is reduced, and magnetic interference on the periphery of the magnetic core is reduced; and single-section air gaps can be arranged at two ends of the second core body, and compared with the single-section air gaps arranged at one end of the second core body, the volume of the magnetic core can be further reduced under the condition of the same air gap width.
Optionally, in an embodiment of the present invention, the third winding is wound around a middle portion of the second core. The third winding is wound in the middle of the second core body, the first winding and the second winding are wound on the first core body, the first winding, the second winding and the third winding are integrated on the same magnetic core, the filter inductor and the transformer are applied to the power conversion circuit in a magnetic integration mode, the filter inductor and the transformer are integrated in function through magnetic circuit multiplexing in the magnetic integration mode, and therefore the size of the magnetic core is reduced, and the whole power conversion circuit can save the space to be occupied.
Optionally, in an embodiment of the present invention, the second core is provided with a second center pillar, and the third winding is wound on the second center pillar. Through set up the second center pillar at the second core, under the condition that realizes the same inductance, can reduce the width of both sides limit post to further reduce the magnetic core volume.
Optionally, in an embodiment of the present invention, a single-stage air gap is provided between the second center pillar and the first core to prevent the magnetic core from being saturated, and meanwhile, the equivalent length of the magnetic circuit is increased, so as to increase the energy storage and reduce the inductance.
Optionally, in an embodiment of the present invention, the first winding and the second winding are wound on two sides of the first core respectively. The third winding is wound on the second core body, the first winding and the second winding are wound on two sides of the first core body, the first winding, the second winding and the third winding are integrated on the same magnetic core, the filter inductor and the transformer are applied to the power conversion circuit in a magnetic integration mode, the filter inductor and the transformer are integrated in function through magnetic circuit multiplexing in the magnetic integration mode, and therefore the size of the magnetic core is reduced, and the whole power conversion circuit can save the space to be occupied.
Optionally, in an embodiment of the present invention, the first core is provided with a first center pillar, and the first winding and the second winding are wound on the first center pillar. Through set up first center pillar at first core to with first winding and second winding coiling on first center pillar, under the condition that realizes the same inductance value, can reduce the width of both sides limit post, thereby further reduce the magnetic core volume.
Optionally, in an embodiment of the present invention, the winding core further includes a detection circuit, the detection circuit includes a fourth winding coupled to the third winding, and the fourth winding is wound on the second core. The fourth winding is a filter inductance current detection winding, the current on the power conversion circuit is induced according to the magnetic circuit mutual coupling principle, and the coupling branch where the fourth winding is located is connected to the detection circuit, so that the detection circuit can be used as the sampling of the input current of the power conversion circuit, and can also be used as the input overcurrent protection of the power conversion circuit.
Optionally, in an embodiment of the present invention, the third winding and the fourth winding are wound in a middle portion of the second core. The third winding and the fourth winding are wound in the middle of the second core body, the first winding and the second winding are wound on the first core body, namely the first winding, the second winding, the third winding and the fourth winding are integrated on the same magnetic core, the filter inductor and the transformer are applied to the power conversion circuit in a magnetic integration mode, the filter inductor and the transformer are integrated in function through the magnetic integration mode, the magnetic integration mode achieves integration of the filter inductor and the transformer in a multiplexing mode through a magnetic circuit, and therefore the size of the magnetic core is reduced, and the whole power conversion circuit can save the space to be occupied.
Optionally, in an embodiment of the present invention, the third winding and the fourth winding are respectively wound at two ends of the second core. The third winding and the fourth winding are wound at two ends of the second core respectively, the first winding and the second winding are wound on the first core, namely the first winding, the second winding, the third winding and the fourth winding are integrated on the same magnetic core, the filter inductor and the transformer are applied to the power conversion circuit in a magnetic integration mode, the filter inductor and the transformer are integrated in function through the magnetic integration mode, the magnetic integration mode achieves integration of the functions of the filter inductor and the transformer through magnetic circuit multiplexing, and therefore the size of the magnetic core is reduced, and the whole power conversion circuit can save the space to be occupied.
Optionally, in an embodiment of the present invention, the second core is provided with a second center pillar, and the third winding and the fourth winding are wound on the second center pillar. Through being provided with the second center pillar at the second core, with third winding and fourth winding coiling on the second center pillar, satisfying the condition of same magnetic flux, can reduce the width of both sides limit post to further reduce the magnetic core volume.
In a second aspect, an embodiment of the present invention provides a circuit board, including the power conversion circuit as described in the first aspect above.
The utility model discloses the technical scheme of above-mentioned second aspect has one of following advantage or beneficial effect at least: the utility model discloses circuit board because the circuit board has the power conversion circuit of above-mentioned first aspect, power conversion circuit includes the transformer, sets up at the resonance circuit of transformer input side and sets up at transformer output side rectifier filter circuit. The transformer is provided with a first winding and a second winding, the filter inductor is provided with a third winding, the first winding, the second winding and the third winding are wound on the same magnetic core, the magnetic core is provided with a first core body in a closed shape and a second core body in an open shape, the opening of the second core body faces the first core body, specifically, the first winding and the second winding are wound on the first core body, and the third winding is wound on the second core body, so that the first winding, the second winding and the third winding are integrated on the same magnetic core. Based on this, through using filter inductance and transformer in power conversion circuit through the integrated mode of magnetism, this integrated mode of magnetism realizes filter inductance and transformer function unification through the multiplexing realization of magnetic circuit to reduce the magnetic core volume, make whole power conversion circuit can save the space that will occupy.
In a third aspect, an embodiment of the present invention provides an air conditioner, including the power conversion circuit as described in the first aspect above.
The utility model discloses the technical scheme of above-mentioned third aspect has one of following advantage or beneficial effect at least: the utility model discloses air conditioner because air conditioner has the power conversion circuit of above-mentioned first aspect, power conversion circuit includes the transformer, sets up at the resonance circuit of transformer input side and sets up at transformer output side rectification filter circuit. The transformer is provided with a first winding and a second winding, the filter inductor is provided with a third winding, the first winding, the second winding and the third winding are wound on the same magnetic core, the magnetic core is provided with a first core body in a closed shape and a second core body in an open shape, the opening of the second core body faces the first core body, specifically, the first winding and the second winding are wound on the first core body, and the third winding is wound on the second core body, so that the first winding, the second winding and the third winding are integrated on the same magnetic core. Based on this, through using filter inductance and transformer in power conversion circuit through the integrated mode of magnetism, this integrated mode of magnetism realizes filter inductance and transformer function unification through the multiplexing realization of magnetic circuit to reduce the magnetic core volume, make whole power conversion circuit can save the space that will occupy.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the technical solutions of the present invention, and are incorporated in and constitute a part of this specification, together with the embodiments of the present invention for explaining the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.
Fig. 1 is a schematic diagram of a power conversion circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a magnetic integration structure of a filter inductor and a transformer according to an embodiment of the present invention;
fig. 3A to fig. 3N are schematic diagrams illustrating an extension of a magnetic integrated structure of a filter inductor and a transformer according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a magnetic integration structure of a filter inductor with a fourth winding and a transformer according to an embodiment of the present invention;
fig. 5A is a schematic diagram of a power conversion circuit with a detection circuit according to an embodiment of the present invention;
fig. 5B is a schematic diagram of a power conversion circuit with a detection circuit according to another embodiment of the present invention;
fig. 6A to fig. 6N are schematic diagrams illustrating an extension of the integrated structure of the filter inductor with the fourth winding and the transformer according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It should be understood that in the description of the embodiments of the present invention, a plurality (or a plurality) is/are two or more, and more, less, more, etc. are understood as excluding the number, and more, less, more, etc. are understood as including the number. If the description of "first", "second", etc. is used for the purpose of distinguishing technical features, it is not intended to indicate or imply relative importance or to implicitly indicate the number of indicated technical features or to implicitly indicate the precedence of the indicated technical features.
In the related art, the power conversion circuit uses two devices, namely a filter inductor and a transformer, but the filter inductor and the transformer are two independent devices, and the total occupied volume is large, so that the whole power conversion circuit needs to occupy a large space in an applied product, and the trend of pursuing miniaturization of various intelligent products at present is not met.
Based on this, the embodiment of the utility model provides a power conversion circuit, circuit board and air conditioner, power conversion circuit include the transformer, set up at the rectification energy storage circuit of transformer input side and set up at transformer output side rectification filter circuit. The transformer is provided with a first winding and a second winding, the filter inductor is provided with a third winding, the first winding, the second winding and the third winding are wound on the same magnetic core, the magnetic core is provided with a first core body in a closed shape and a second core body in an open shape, the opening of the second core body faces the first core body, specifically, the first winding and the second winding are wound on the first core body, and the third winding is wound on the second core body, so that the first winding, the second winding and the third winding are integrated on the same magnetic core. Based on this, through using filter inductance and transformer in power conversion circuit through the integrated mode of magnetism, this integrated mode of magnetism realizes filter inductance and transformer function unification through the multiplexing realization of magnetic circuit to reduce the magnetic core volume, make whole power conversion circuit can save the space that will occupy.
The embodiments of the present invention will be further explained with reference to the drawings.
As shown in fig. 1, one embodiment of the present invention provides a power conversion circuit. The power conversion circuit comprises a transformer, a resonance circuit and a rectification filter circuit. AC input end VinIs connected to the input side of the transformer through a rectification energy storage circuit, and the output side of the transformer is connected to a load R through a rectification filter circuitL. The transformer at least includes a first winding 110 and a second winding 120, and the filter inductor Lo in the rectifying and filtering circuit at least includes a third winding 130, as shown in fig. 2, the first winding 110, the second winding 120, and the third winding 130 are all wound on the same magnetic core. The magnetic core comprises a first core body 210 and a second core body 220, wherein the first core body 210 is a closed-end device and is approximately shaped like a Chinese character 'kou'; the second core 220 is an open type device, and has a substantially "U" shape. Also, the opening of the second core 220 faces the first core 210. Specifically, the first winding 110 and the second winding 120 are wound on the first core 210, and the third winding 130 is wound on the second core 220, so that the first winding 110, the second winding 120, and the third winding 130 are all integrated on the same magnetic core. Based on this, by changing the filter inductanceThe transformer is applied to the power conversion circuit in a magnetic integration mode, and the magnetic integration mode realizes the integration of the functions of the filter inductor and the transformer through the multiplexing of a magnetic circuit, so that the volume of a magnetic core is reduced, and the occupied space of the whole power conversion circuit can be saved.
In an embodiment, the rectifying energy storage circuit includes a first discharging resistor R1, a second discharging resistor R2, a first capacitor C1, a second capacitor C2, a first MOS transistor Q1, a second MOS transistor Q2, a third diode D3, a fourth diode D4, and an energy storage capacitor C3, the first discharging resistor R1 is connected in parallel with the first capacitor C1, the second discharging resistor R2 is connected in parallel with the second capacitor C2, the third diode D3 is connected in parallel with the first MOS transistor Q1 in reverse, the fourth diode D4 is connected in parallel with the second MOS transistor Q2 in reverse, the first capacitor C1 and the second capacitor C2 are connected in series to form a first branch, the first MOS transistor Q1 and the second MOS transistor Q2 are connected in series to form a second branch, the first branch is connected in parallel with the second branch, and the second branch is connected to the input side of the transformer through the energy storage capacitor C3.
In one embodiment, the rectifying and filtering circuit includes a first diode D1, a second diode D2, and a filter inductor LOAnd a filter capacitor COThe first diode D1 and the second diode D2 form a half-bridge rectifier circuit, and the half-bridge rectifier circuit passes through a filter inductor LOFilter capacitor COIs connected to a load RL. The rectification filter circuit is arranged on the output side of the transformer, wherein the half-bridge rectification circuit plays a role in rectification in the circuit, and the filter inductor LOAnd a filter capacitor COAnd the filter function is realized in the circuit.
In one embodiment, the structure of the magnetic core, the arrangement of the air gap, and the winding of the winding may be arranged differently according to the design requirements of inductance and magnetic flux density. For example, the structure of the magnetic core may be a closed structure in a shape of "square", or a center pillar may be added to the closed structure in the shape of "square"; for the arrangement mode of the air gap, a single-section air gap can be arranged on the side column at one side of the magnetic core, a single-section air gap can be arranged on the side columns at two sides of the magnetic core, and a plurality of sections of air gaps can be arranged on the side column at one side of the magnetic core; for the winding manner, the first winding 110 and the second winding 120 of the transformer may be respectively wound around the side columns at both sides of the first core 210, or may be both wound around the center column in the middle of the first core 210, and the third winding 130 of the filter inductor Lo may be wound around the middle of the second core 220, or may be wound around the center column added on the basis of the "U" shaped second core 220.
In one embodiment, one end of the second core 220 is connected to the first core 210, and the other end of the second core 220 is provided with a single-segment air gap or a multi-segment air gap; or, both ends of the second core 220 are provided with a single-segment air gap; alternatively, both ends of the second core 220 are connected to the first core 210. For the structure of the magnetic core, one end of the second core 220 is connected with the first core 210, or both ends of the second core 220 are connected with the first core 210, to form a complete closed magnetic path. For the arrangement mode of the air gap, a single-section air gap can be arranged at the other end of the second core 220, and the single-section air gap is mixed with an air medium, so that the magnetic conductivity is improved and reduced, the magnetic saturation phenomenon is better controlled, and the uniformity of inductance is improved; a plurality of sections of air gaps can be arranged at the other end of the second core 220, and the width of each section of air gap can be reduced, so that leakage inductance can be reduced, eddy current loss can be reduced, and magnetic interference on the periphery of the magnetic core can be reduced; a single-segment air gap may be further disposed at both ends of the second core 220, and the volume of the magnetic core may be further reduced in comparison with a single-segment air gap disposed at one end of the second core 220.
In an embodiment, as shown in fig. 3A, the first winding 110 and the second winding 120 are respectively wound around the side columns at two sides of the first core 210, the third winding 130 is wound around the middle of the second core 220, one end of the second core 220 is connected to the first core 210, and the other end of the second core 220 is provided with a single-segment air gap, which improves and reduces magnetic permeability due to the air medium mixed in, so as to better control the magnetic saturation phenomenon and improve the uniformity of inductance. In addition, a single-stage air gap is provided at the side edge of the second core 220, facilitating processing.
In an embodiment, as shown in fig. 3B, the first winding 110 and the second winding 120 are respectively wound on the side legs at both sides of the first core 210, and the third winding 130 is wound on the second center leg 221 of the second core 220, since the position of the second center leg 221 is located inside the "U" shape, the volume of the second core 220 can be further reduced compared to the position of the third winding 130 wound on the "U" shape of the second core 220. Moreover, a single-stage air gap is also arranged between the second center pillar 221 and the first core 210 to prevent the magnetic core from being saturated, and meanwhile, the equivalent length of the magnetic circuit is increased, so that the stored energy is increased, and the inductance can be reduced. In addition, both ends of the second core 220 are connected to the first core 210 without providing an air gap, in this case, the second core 220 is made of a ferrite core material, so as to improve the uniformity of inductance.
In an embodiment, as shown in fig. 3C, the first winding 110 and the second winding 120 are respectively wound on the side legs at both sides of the first core 210, and the third winding 130 is wound on the second center leg 221 of the second core 220, since the position of the second center leg 221 is located inside the "U" shape, the volume of the second core 220 can be further reduced compared to the position of the third winding 130 wound on the "U" shape of the second core 220. In addition, the two ends of the second core 220 are both provided with a single-segment air gap, and compared with the case where the single-segment air gap is provided at one end of the second core 220, the volume of the magnetic core can be further reduced under the condition of the same air gap width, for example, if the width of the single-segment air gap required to be provided at one end of the second core 220 is 1 mm, then only the single-segment air gap with the width of 0.5 mm needs to be provided at both ends of the second core 220, and both can achieve the equivalent effect, but the latter is reduced by 0.5 mm compared with the air gap between the first core 210 and the second core 220, and therefore, the volume of the magnetic core can be further reduced.
In an embodiment, as shown in fig. 3D, the first winding 110 and the second winding 120 are respectively wound on the side legs at both sides of the first core 210, and the third winding 130 is wound on the second center leg 221 of the second core 220, since the position of the second center leg 221 is located inside the "U" shape, the volume of the second core 220 can be further reduced compared to the position of the third winding 130 wound on the "U" shape of the second core 220. Both ends of the second core 220 are provided with a single-segment air gap, and compared with the case where one end of the second core 220 is provided with a single-segment air gap, the volume of the magnetic core can be further reduced under the condition of the same air gap width, for example, if the width of the single-segment air gap required to be arranged at one end of the second core 220 is 1 mm, then only the single-segment air gap with the width of 0.5 mm needs to be arranged at both ends of the second core 220, both can achieve the equivalent effect, but the latter is reduced by 0.5 mm compared with the air gap between the second core 220 and the first core 210, and therefore, the volume of the magnetic core can be further reduced. In addition, a single-stage air gap is also disposed between the second center pillar 221 and the first core 210 to prevent the core from being saturated, and at the same time, the equivalent length of the magnetic path is increased, so that the stored energy is increased, and the inductance can be reduced.
In an embodiment, as shown in fig. 3E, the first winding 110 and the second winding 120 are respectively wound around the side pillars at both sides of the first core 210, and a first center pillar 211 is disposed inside the first core 210 in a shape of a square. Since the third winding 130 is wound around the second leg 221 of the second core 220 and the second leg 221 is positioned inside the U-shape, the volume of the second core 220 can be further reduced compared to the case where the third winding 130 is wound around the U-shape of the second core 220. Moreover, a single-stage air gap is also arranged between the second center pillar 221 and the first core 210 to prevent the magnetic core from being saturated, and meanwhile, the equivalent length of the magnetic circuit is increased, so that the stored energy is increased, and the inductance can be reduced. In addition, both ends of the second core 220 are connected to the first core 210 without providing an air gap, in this case, the second core 220 is made of a ferrite core material, so as to improve the uniformity of inductance.
In an embodiment, as shown in fig. 3F, the first winding 110 and the second winding 120 are respectively wound around the side pillars at both sides of the first core 210, and a first center pillar 211 is disposed inside the first core 210 in a shape of a square. Since the third winding 130 is wound around the second leg 221 of the second core 220 and the second leg 221 is positioned inside the U-shape, the volume of the second core 220 can be further reduced compared to the case where the third winding 130 is wound around the U-shape of the second core 220. In addition, the two ends of the second core 220 are both provided with a single-segment air gap, and compared with the case where the single-segment air gap is provided at one end of the second core 220, the volume of the magnetic core can be further reduced under the condition of the same air gap width, for example, if the width of the single-segment air gap required to be provided at one end of the second core 220 is 1 mm, then only the single-segment air gap with the width of 0.5 mm needs to be provided at both ends of the second core 220, and both can achieve the equivalent effect, but the latter is reduced by 0.5 mm compared with the air gap between the first core 210 and the second core 220, and therefore, the volume of the magnetic core can be further reduced.
In an embodiment, as shown in fig. 3G, the first winding 110 and the second winding 120 are respectively wound around the side pillars at both sides of the first core 210, and a first center pillar 211 is disposed inside the first core 210 in a shape of a square. Since the third winding 130 is wound around the second leg 221 of the second core 220 and the second leg 221 is positioned inside the U-shape, the volume of the second core 220 can be further reduced compared to the case where the third winding 130 is wound around the U-shape of the second core 220. Both ends of the second core 220 are provided with a single-segment air gap, and compared with the case where one end of the second core 220 is provided with a single-segment air gap, the volume of the magnetic core can be further reduced under the condition of the same air gap width, for example, if the width of the single-segment air gap required to be arranged at one end of the second core 220 is 1 mm, then only the single-segment air gap with the width of 0.5 mm needs to be arranged at both ends of the second core 220, both can achieve the equivalent effect, but the latter is reduced by 0.5 mm compared with the air gap between the second core 220 and the first core 210, and therefore, the volume of the magnetic core can be further reduced. In addition, a single-stage air gap is also disposed between the second center pillar 221 and the first core 210 to prevent the core from being saturated, and at the same time, the equivalent length of the magnetic path is increased, so that the stored energy is increased, and the inductance can be reduced.
In an embodiment, as shown in fig. 3H, the first winding 110 and the second winding 120 are respectively wound around the side columns at two sides of the first core 210, the third winding 130 is wound around the middle of the second core 220, one end of the second core 220 is connected to the first core 210, and the other end of the second core 220 is provided with a plurality of air gaps, so that the width of each air gap can be reduced compared with a single air gap, and leakage inductance, eddy current loss, and magnetic interference to the periphery of the magnetic core are reduced.
In an embodiment, as shown in fig. 3I, a first center pillar 211 is disposed inside the first core 210 in a shape of a Chinese character 'kou', and the first winding 110 and the second winding 120 are wound around the first center pillar 211, and since the first center pillar 211 is located inside the shape of the Chinese character 'kou', the volume of the first core 210 can be further reduced compared to the case where the first winding 110 and the second winding 120 are wound around the side pillars at two sides of the first core 210. Since the third winding 130 is wound around the second leg 221 of the second core 220 and the second leg 221 is positioned inside the U-shape, the volume of the second core 220 can be further reduced compared to the case where the third winding 130 is wound around the U-shape of the second core 220. Moreover, a single-stage air gap is also arranged between the second center pillar 221 and the first core 210 to prevent the magnetic core from being saturated, and meanwhile, the equivalent length of the magnetic circuit is increased, so that the stored energy is increased, and the inductance can be reduced. In addition, both ends of the second core 220 are connected to the first core 210 without providing an air gap, in this case, the second core 220 is made of a ferrite core material, so as to improve the uniformity of inductance.
In an embodiment, as shown in fig. 3J, a first center pillar 211 is disposed inside the first core 210 in a shape of a Chinese character 'kou', and the first winding 110 and the second winding 120 are wound around the first center pillar 211, and since the first center pillar 211 is located inside the shape of the Chinese character 'kou', the volume of the first core 210 can be further reduced compared to the case where the first winding 110 and the second winding 120 are wound around the side pillars at two sides of the first core 210. Since the third winding 130 is wound around the second leg 221 of the second core 220 and the second leg 221 is positioned inside the U-shape, the volume of the second core 220 can be further reduced compared to the case where the third winding 130 is wound around the U-shape of the second core 220. In addition, the two ends of the second core 220 are both provided with a single-segment air gap, and compared with the case where the single-segment air gap is provided at one end of the second core 220, the volume of the magnetic core can be further reduced under the condition of the same air gap width, for example, if the width of the single-segment air gap required to be provided at one end of the second core 220 is 1 mm, then only the single-segment air gap with the width of 0.5 mm needs to be provided at both ends of the second core 220, and both can achieve the equivalent effect, but the latter is reduced by 0.5 mm compared with the air gap between the first core 210 and the second core 220, and therefore, the volume of the magnetic core can be further reduced.
In an embodiment, as shown in fig. 3K, a first center pillar 211 is disposed inside the first core 210 in a shape of a Chinese character 'kou', and the first winding 110 and the second winding 120 are wound around the first center pillar 211, and since the first center pillar 211 is located inside the shape of the Chinese character 'kou', the volume of the first core 210 can be further reduced compared to the case where the first winding 110 and the second winding 120 are wound around the side pillars at two sides of the first core 210. Both ends of the second core 220 are provided with a single-segment air gap, and compared with the case where one end of the second core 220 is provided with a single-segment air gap, the volume of the magnetic core can be further reduced under the condition of the same air gap width, for example, if the width of the single-segment air gap required to be arranged at one end of the second core 220 is 1 mm, then only the single-segment air gap with the width of 0.5 mm needs to be arranged at both ends of the second core 220, both can achieve the equivalent effect, but the latter is reduced by 0.5 mm compared with the air gap between the second core 220 and the first core 210, and therefore, the volume of the magnetic core can be further reduced. In addition, a single-stage air gap is also disposed between the second center pillar 221 and the first core 210 to prevent the core from being saturated, and at the same time, the equivalent length of the magnetic path is increased, so that the stored energy is increased, and the inductance can be reduced.
In an embodiment, as shown in fig. 3L, a first center pillar 211 is disposed inside the first core 210 in a shape of a Chinese character 'kou', and the first winding 110 and the second winding 120 are wound around the first center pillar 211, and since the first center pillar 211 is located inside the shape of the Chinese character 'kou', the volume of the first core 210 can be further reduced compared to the case where the first winding 110 and the second winding 120 are wound around the side pillars at two sides of the first core 210. The third winding 130 is wound around the middle of the second core 220, one end of the second core 220 is connected to the first core 210, and the other end of the second core 220 is provided with a single-section air gap, which is mixed with an air medium to improve and reduce the magnetic permeability, thereby better controlling the magnetic saturation phenomenon and improving the uniformity of the inductance. In addition, a single-stage air gap is provided at the side edge of the second core 220, facilitating processing.
In an embodiment, as shown in fig. 3M, a first center pillar 211 is disposed inside the first core 210 in a shape of a Chinese character 'kou', and the first winding 110 and the second winding 120 are wound around the first center pillar 211, and since the first center pillar 211 is located inside the shape of the Chinese character 'kou', the volume of the first core 210 can be further reduced compared to the case where the first winding 110 and the second winding 120 are wound around the side pillars at two sides of the first core 210. The third winding 130 is wound around the middle of the second core 220, and two ends of the second core 220 are both provided with a single-segment air gap, and compared with the case where one end of the second core 220 is provided with a single-segment air gap, the volume of the magnetic core can be further reduced under the condition of the same air gap width, for example, if the width of the single-segment air gap required to be arranged at one end of the second core 220 is 1 mm, then only the single-segment air gap with the width of 0.5 mm needs to be arranged at two ends of the second core 220, both can achieve an equivalent effect, but the latter is reduced by 0.5 mm compared with the air gap between the first core 210 and the second core 220, and therefore, the volume of the magnetic core can be further reduced.
In an embodiment, as shown in fig. 3N, a first center pillar 211 is disposed inside the first core 210 in a shape of a square, and the first winding 110 and the second winding 120 are wound around the first center pillar 211, and since the first center pillar 211 is located inside the shape of the square, the volume of the first core 210 can be further reduced compared to the case where the first winding 110 and the second winding 120 are wound around the side pillars at two sides of the first core 210. The third winding 130 is wound around the middle of the second core 220, one end of the second core 220 is connected to the first core 210, and the other end of the second core 220 is provided with multiple air gaps, so that the width of each air gap can be reduced compared with a single air gap, thereby reducing leakage inductance, reducing eddy current loss, and reducing magnetic interference on the periphery of the magnetic core.
An embodiment of the utility model provides a power conversion circuit is still provided. The power conversion circuit further includes a detection circuit including a fourth winding 140 coupled to the third winding 130, the fourth winding 140 being wound on the second core 220. As shown in fig. 4, the first winding 110 and the second winding 120 are wound on the first core 210, and the third winding 130 and the fourth winding 140 are wound on the second core 220, that is, the first winding 110, the second winding 120, the third winding 130 and the fourth winding 140 are all integrated on the same magnetic core, and the filter inductor and the transformer are applied to the power conversion circuit in a magnetic integration manner, which realizes the integration of the functions of the filter inductor and the transformer through magnetic circuit multiplexing, thereby reducing the volume of the magnetic core, and enabling the whole power conversion circuit to save the space to be occupied. Furthermore, the fourth winding 140 is used as a filter inductor current detection winding to induce current on the power conversion circuit according to the magnetic circuit mutual coupling principle, and the coupling branch where the fourth winding 140 is located is connected to the detection circuit, so that the detection circuit can be used as a sample of the input current of the power conversion circuit, and can also be used as input overcurrent protection of the power conversion circuit.
In an embodiment, as shown in fig. 5A, the detection circuit includes a fourth winding 140 coupled to the third winding 130, a switching circuit, and a PWM generator, wherein one end of the fourth winding 140 is connected to an input terminal of the PWM generator through the switching circuit, an output terminal of the PWM generator is connected to a control pin of the first MOS transistor and a control pin of the second MOS transistor, respectively, and another end of the fourth winding 140 is grounded. The fourth winding 140 is used as a filter inductor current detection winding to induce current on the power conversion circuit according to the magnetic circuit mutual coupling principle, and the coupling branch where the fourth winding 140 is located sends a current detection signal to the PWM generator through the conversion circuit, so that the detection circuit can be used as a power conversion circuit to sample input current.
In an embodiment, as shown in fig. 5B, the detection circuit includes a fourth winding 140 coupled to the third winding 130, a conversion circuit, and a micro control unit MCU, wherein one end of the fourth winding 140 is connected to an input terminal of the micro control unit MCU through the conversion circuit, an output terminal of the PWM generator is connected to a control pin of the first MOS transistor and a control pin of the second MOS transistor, and the other end of the fourth winding 140 is grounded. The fourth winding 140 serves as a filter inductor current detection winding and induces current on the power conversion circuit according to the magnetic circuit mutual coupling principle, the coupling branch where the fourth winding 140 is located sends an overcurrent signal to the MCU through the conversion circuit, and the MCU controls the first MOS transistor and the second MOS transistor according to the overcurrent signal, so that the detection circuit can serve as input overcurrent protection of the power conversion circuit.
In an embodiment, as shown in fig. 6A, the first winding 110 and the second winding 120 are respectively wound around the side columns at two sides of the first core 210, the third winding 130 and the fourth winding 140 are wound around the middle of the second core 220, one end of the second core 220 is connected to the first core 210, and the other end of the second core 220 is provided with a single-segment air gap, which is mixed with an air medium to improve and reduce the magnetic permeability, so as to better control the magnetic saturation phenomenon and improve the uniformity of the inductance. In addition, a single-stage air gap is provided at the side edge of the second core 220, facilitating processing.
In an embodiment, as shown in fig. 6B, the first winding 110 and the second winding 120 are respectively wound on the side legs of the first core 210, and the third winding 130 and the fourth winding 140 are wound on the second center leg 221 of the second core 220, so that the width of the side legs of the second core 220 can be reduced under the condition of satisfying the same magnetic flux, thereby reducing the volume of the second core 220. Meanwhile, since the second center leg 221 is positioned inside the "U" shape, the volume of the second core 220 can be further reduced with respect to the case where the third winding 130 is wound in the "U" shape of the second core 220. Moreover, a single-stage air gap is also arranged between the second center pillar 221 and the first core 210 to prevent the magnetic core from being saturated, and meanwhile, the equivalent length of the magnetic circuit is increased, so that the stored energy is increased, and the inductance can be reduced. In addition, both ends of the second core 220 are connected to the first core 210 without providing an air gap, in this case, the second core 220 is made of a ferrite core material, so as to improve the uniformity of inductance.
In an embodiment, as shown in fig. 6C, the first winding 110 and the second winding 120 are respectively wound on the side legs of the first core 210, and the third winding 130 and the fourth winding 140 are wound on the second center leg 221 of the second core 220, so that the width of the side legs of the second core 220 can be reduced under the condition of satisfying the same magnetic flux, thereby reducing the volume of the second core 220. Meanwhile, since the second center leg 221 is positioned inside the "U" shape, the volume of the second core 220 can be further reduced with respect to the case where the third winding 130 is wound in the "U" shape of the second core 220. In addition, the two ends of the second core 220 are both provided with a single-segment air gap, and compared with the case where the single-segment air gap is provided at one end of the second core 220, the volume of the magnetic core can be further reduced under the condition of the same air gap width, for example, if the width of the single-segment air gap required to be provided at one end of the second core 220 is 1 mm, then only the single-segment air gap with the width of 0.5 mm needs to be provided at both ends of the second core 220, and both can achieve the equivalent effect, but the latter is reduced by 0.5 mm compared with the air gap between the first core 210 and the second core 220, and therefore, the volume of the magnetic core can be further reduced.
In one embodiment, as shown in fig. 6D, the first winding 110 and the second winding 120 are wound around the side legs of the first core 210, and the third winding 130 and the fourth winding 140 are wound around the second core 220. Both ends of the second core 220 are provided with a single-segment air gap, and compared with the case where one end of the second core 220 is provided with a single-segment air gap, the volume of the magnetic core can be further reduced under the condition of the same air gap width, for example, if the width of the single-segment air gap required to be arranged at one end of the second core 220 is 1 mm, then only the single-segment air gap with the width of 0.5 mm needs to be arranged at both ends of the second core 220, both can achieve the equivalent effect, but the latter is reduced by 0.5 mm compared with the air gap between the second core 220 and the first core 210, and therefore, the volume of the magnetic core can be further reduced. In addition, a single-stage air gap is also disposed between the second center pillar 221 and the first core 210 to prevent the core from being saturated, and at the same time, the equivalent length of the magnetic path is increased, so that the stored energy is increased, and the inductance can be reduced.
In an embodiment, as shown in fig. 6E, the first winding 110 and the second winding 120 are respectively wound around the side pillars at both sides of the first core 210, and a first center pillar 211 is disposed inside the first core 210 in a shape of a square. And the third winding 130 and the fourth winding 140 are wound on the second central pillar 221 of the second core 220, so that the widths of the two side pillars of the second core 220 can be reduced under the condition of meeting the same magnetic flux, thereby reducing the volume of the second core 220. Meanwhile, since the second center leg 221 is positioned inside the "U" shape, the volume of the second core 220 can be further reduced with respect to the case where the third winding 130 is wound in the "U" shape of the second core 220. Moreover, a single-stage air gap is also arranged between the second center pillar 221 and the first core 210 to prevent the magnetic core from being saturated, and meanwhile, the equivalent length of the magnetic circuit is increased, so that the stored energy is increased, and the inductance can be reduced. In addition, both ends of the second core 220 are connected to the first core 210 without providing an air gap, in this case, the second core 220 is made of a ferrite core material, so as to improve the uniformity of inductance.
In an embodiment, as shown in fig. 6F, the first winding 110 and the second winding 120 are respectively wound around the side pillars at both sides of the first core 210, and a first center pillar 211 is disposed inside the first core 210 in a shape of a square. And the third winding 130 and the fourth winding 140 are wound on the second central pillar 221 of the second core 220, so that the widths of the two side pillars of the second core 220 can be reduced under the condition of meeting the same magnetic flux, thereby reducing the volume of the second core 220. Meanwhile, since the second center leg 221 is positioned inside the "U" shape, the volume of the second core 220 can be further reduced with respect to the case where the third winding 130 is wound in the "U" shape of the second core 220. In addition, the two ends of the second core 220 are both provided with a single-segment air gap, and compared with the case where the single-segment air gap is provided at one end of the second core 220, the volume of the magnetic core can be further reduced under the condition of the same air gap width, for example, if the width of the single-segment air gap required to be provided at one end of the second core 220 is 1 mm, then only the single-segment air gap with the width of 0.5 mm needs to be provided at both ends of the second core 220, and both can achieve the equivalent effect, but the latter is reduced by 0.5 mm compared with the air gap between the first core 210 and the second core 220, and therefore, the volume of the magnetic core can be further reduced.
In an embodiment, as shown in fig. 6G, the first winding 110 and the second winding 120 are respectively wound around the side pillars at both sides of the first core 210, and a first center pillar 211 is disposed inside the first core 210 in a shape of a square. And the third winding 130 and the fourth winding 140 are wound on both sides of the second core 220, respectively. Both ends of the second core 220 are provided with a single-segment air gap, and compared with the case where one end of the second core 220 is provided with a single-segment air gap, the volume of the magnetic core can be further reduced under the condition of the same air gap width, for example, if the width of the single-segment air gap required to be arranged at one end of the second core 220 is 1 mm, then only the single-segment air gap with the width of 0.5 mm needs to be arranged at both ends of the second core 220, both can achieve the equivalent effect, but the latter is reduced by 0.5 mm compared with the air gap between the second core 220 and the first core 210, and therefore, the volume of the magnetic core can be further reduced. In addition, a single-stage air gap is also disposed between the second center pillar 221 and the first core 210 to prevent the core from being saturated, and at the same time, the equivalent length of the magnetic path is increased, so that the stored energy is increased, and the inductance can be reduced.
In an embodiment, as shown in fig. 6H, the first winding 110 and the second winding 120 are respectively wound around the side columns at two sides of the first core 210, the third winding 130 and the fourth winding 140 are wound around the middle of the second core 220, one end of the second core 220 is connected to the first core 210, and the other end of the second core 220 is provided with a plurality of air gaps, so that the width of each air gap can be reduced compared with a single air gap, and leakage inductance, eddy current loss and magnetic interference on the periphery of the magnetic core are reduced.
In an embodiment, as shown in fig. 6I, a first center pillar 211 is disposed inside the first core 210 in a shape of a square, and the first winding 110 and the second winding 120 are wound around the first center pillar 211, and since the first center pillar 211 is located inside the shape of the square, the volume of the first core 210 can be further reduced compared to the case where the first winding 110 and the second winding 120 are wound around the side pillars at two sides of the first core 210. And the third winding 130 and the fourth winding 140 are wound on the second central pillar 221 of the second core 220, so that the widths of the two side pillars of the second core 220 can be reduced under the condition of meeting the same magnetic flux, thereby reducing the volume of the second core 220. Meanwhile, since the second center leg 221 is positioned inside the "U" shape, the volume of the second core 220 can be further reduced with respect to the case where the third winding 130 is wound in the "U" shape of the second core 220. Moreover, a single-stage air gap is also arranged between the second center pillar 221 and the first core 210 to prevent the magnetic core from being saturated, and meanwhile, the equivalent length of the magnetic circuit is increased, so that the stored energy is increased, and the inductance can be reduced. In addition, both ends of the second core 220 are connected to the first core 210 without providing an air gap, in this case, the second core 220 is made of a ferrite core material, so as to improve the uniformity of inductance.
In an embodiment, as shown in fig. 6J, a first center pillar 211 is disposed inside the first core 210 in a shape of a square, and the first winding 110 and the second winding 120 are wound around the first center pillar 211, and since the first center pillar 211 is located inside the shape of the square, the volume of the first core 210 can be further reduced compared to the case where the first winding 110 and the second winding 120 are wound around the side pillars at two sides of the first core 210. And the third winding 130 and the fourth winding 140 are wound on the second central pillar 221 of the second core 220, so that the widths of the two side pillars of the second core 220 can be reduced under the condition of meeting the same magnetic flux, thereby reducing the volume of the second core 220. Meanwhile, since the second center leg 221 is positioned inside the "U" shape, the volume of the second core 220 can be further reduced with respect to the case where the third winding 130 is wound in the "U" shape of the second core 220. In addition, the two ends of the second core 220 are both provided with a single-segment air gap, and compared with the case where the single-segment air gap is provided at one end of the second core 220, the volume of the magnetic core can be further reduced under the condition of the same air gap width, for example, if the width of the single-segment air gap required to be provided at one end of the second core 220 is 1 mm, then only the single-segment air gap with the width of 0.5 mm needs to be provided at both ends of the second core 220, and both can achieve the equivalent effect, but the latter is reduced by 0.5 mm compared with the air gap between the first core 210 and the second core 220, and therefore, the volume of the magnetic core can be further reduced.
In an embodiment, as shown in fig. 6K, a first center pillar 211 is disposed inside the first core 210 in a shape of a Chinese character 'kou', and the first winding 110 and the second winding 120 are wound around the first center pillar 211, and since the first center pillar 211 is located inside the shape of the Chinese character 'kou', the volume of the first core 210 can be further reduced compared to the case where the first winding 110 and the second winding 120 are wound around the side pillars at two sides of the first core 210. And the third winding 130 and the fourth winding 140 are wound on both sides of the second core 220, respectively. Both ends of the second core 220 are provided with a single-segment air gap, and compared with the case where one end of the second core 220 is provided with a single-segment air gap, the volume of the magnetic core can be further reduced under the condition of the same air gap width, for example, if the width of the single-segment air gap required to be arranged at one end of the second core 220 is 1 mm, then only the single-segment air gap with the width of 0.5 mm needs to be arranged at both ends of the second core 220, both can achieve the equivalent effect, but the latter is reduced by 0.5 mm compared with the air gap between the second core 220 and the first core 210, and therefore, the volume of the magnetic core can be further reduced. In addition, a single-stage air gap is also disposed between the second center pillar 221 and the first core 210 to prevent the core from being saturated, and at the same time, the equivalent length of the magnetic path is increased, so that the stored energy is increased, and the inductance can be reduced.
In an embodiment, as shown in fig. 6L, a first center pillar 211 is disposed inside the first core 210 in a shape of a square, and the first winding 110 and the second winding 120 are wound around the first center pillar 211, and since the first center pillar 211 is located inside the shape of the square, the volume of the first core 210 can be further reduced compared to the case where the first winding 110 and the second winding 120 are wound around the side pillars at two sides of the first core 210. The third winding 130 and the fourth winding 140 are wound around the middle of the second core 220, one end of the second core 220 is connected with the first core 210, and the other end of the second core 220 is provided with a single-section air gap, which improves and reduces the magnetic permeability due to the air medium mixed in, thereby better controlling the magnetic saturation phenomenon and improving the uniformity of the inductance. In addition, a single-stage air gap is provided at the side edge of the second core 220, facilitating processing.
In an embodiment, as shown in fig. 6M, a first center pillar 211 is disposed inside the first core 210 in a shape of a square, and the first winding 110 and the second winding 120 are wound around the first center pillar 211, and since the first center pillar 211 is located inside the shape of the square, the volume of the first core 210 can be further reduced compared to the case where the first winding 110 and the second winding 120 are wound around the side pillars at two sides of the first core 210. The third winding 130 and the fourth winding 140 are wound in the middle of the second core 220, and both ends of the second core 220 are provided with a single-segment air gap, and compared with the case where one end of the second core 220 is provided with a single-segment air gap, the volume of the magnetic core can be further reduced under the condition of the same air gap width, for example, if the width of the single-segment air gap required to be arranged at one end of the second core 220 is 1 mm, then only the single-segment air gap with the width of 0.5 mm needs to be arranged at both ends of the second core 220, and both can achieve the equivalent effect, but the latter is reduced by 0.5 mm compared with the air gap between the former second core 220 and the first core 210, and therefore, the volume of the magnetic core can be further reduced.
In an embodiment, as shown in fig. 6N, a first center pillar 211 is disposed inside the first core 210 in a shape of a square, and the first winding 110 and the second winding 120 are wound around the first center pillar 211, and since the first center pillar 211 is located inside the shape of the square, the volume of the first core 210 can be further reduced compared to the case where the first winding 110 and the second winding 120 are wound around the side pillars at two sides of the first core 210. The third winding 130 and the fourth winding 140 are wound around the middle of the second core 220, one end of the second core 220 is connected to the first core 210, and the other end of the second core 220 is provided with a plurality of air gaps, so that the width of each air gap can be reduced compared with a single air gap, leakage inductance is reduced, eddy current loss is reduced, and magnetic interference on the periphery of the magnetic core is reduced.
The embodiment of the utility model provides a still provide a circuit board, the circuit board is including above-mentioned power conversion circuit.
In one embodiment, since the circuit board has the power conversion circuit, the power conversion circuit includes a transformer, a resonance circuit provided on an input side of the transformer, and a rectifying and filtering circuit provided on an output side of the transformer. The transformer is provided with a first winding 110 and a second winding 120, the filter inductor is provided with a third winding 130, the first winding 110, the second winding 120 and the third winding 130 are wound on the same magnetic core, the magnetic core is provided with a first core 210 in a square shape and a second core 220 in a U shape, the opening of the second core 220 faces the first core 210, specifically, the first winding 110 and the second winding 120 are wound on the first core 210, and the third winding 130 is wound on the second core 220, so that the first winding 110, the second winding 120 and the third winding 130 are all integrated on the same magnetic core. Based on this, through using filter inductance and transformer in power conversion circuit through the integrated mode of magnetism, this integrated mode of magnetism realizes filter inductance and transformer function unification through the multiplexing realization of magnetic circuit to reduce the magnetic core volume, make whole power conversion circuit can save the space that will occupy.
In one embodiment, since the circuit board has a power conversion circuit, the power conversion circuit includes a transformer, a resonance circuit disposed on an input side of the transformer, a rectifying and filtering circuit disposed on an output side of the transformer, and a detection circuit. The transformer is provided with a first winding 110 and a second winding 120, the filter inductor is provided with a third winding 130, and the detection circuit comprises a fourth winding 140 coupled with the third winding 130. Specifically, the first winding 110 and the second winding 120 are wound on the first core 210, and the third winding 130 and the fourth winding 140 are wound on the second core 220, so that the first winding 110, the second winding 120, the third winding 130 and the fourth winding 140 are all integrated on the same magnetic core, the magnetic core has the first core 210 in a shape of a Chinese character 'kou' and the second core 220 in a shape of a Chinese character 'U', and the opening of the second core 220 faces the first core 210. Based on this, through using filter inductance and transformer in power conversion circuit through the integrated mode of magnetism, this integrated mode of magnetism realizes filter inductance and transformer function unification through the multiplexing realization of magnetic circuit to reduce the magnetic core volume, make whole power conversion circuit can save the space that will occupy. Furthermore, the fourth winding 140 is used as a filter inductor current detection winding to induce current on the power conversion circuit according to the magnetic circuit mutual coupling principle, and the coupling branch where the fourth winding 140 is located is connected to the detection circuit, so that the detection circuit can be used as a sample of the input current of the power conversion circuit, and can also be used as input overcurrent protection of the power conversion circuit.
The embodiment of the utility model provides an air conditioner is still provided, the circuit board is including above-mentioned power conversion circuit.
In one embodiment, since the air conditioner has the above power conversion circuit, the power conversion circuit includes a transformer, a resonance circuit disposed on an input side of the transformer, and a rectifying and filtering circuit disposed on an output side of the transformer. The transformer is provided with a first winding 110 and a second winding 120, the filter inductor is provided with a third winding 130, the first winding 110, the second winding 120 and the third winding 130 are wound on the same magnetic core, the magnetic core is provided with a first core 210 in a square shape and a second core 220 in a U shape, the opening of the second core 220 faces the first core 210, specifically, the first winding 110 and the second winding 120 are wound on the first core 210, and the third winding 130 is wound on the second core 220, so that the first winding 110, the second winding 120 and the third winding 130 are all integrated on the same magnetic core. Based on this, through using filter inductance and transformer in power conversion circuit through the integrated mode of magnetism, this integrated mode of magnetism realizes filter inductance and transformer function unification through the multiplexing realization of magnetic circuit to reduce the magnetic core volume, make whole power conversion circuit can save the space that will occupy.
In one embodiment, since the air conditioner has a power conversion circuit, the power conversion circuit includes a transformer, a resonance circuit provided on an input side of the transformer, a rectifying and filtering circuit provided on an output side of the transformer, and a detection circuit. The transformer is provided with a first winding 110 and a second winding 120, the filter inductor is provided with a third winding 130, and the detection circuit comprises a fourth winding 140 coupled with the third winding 130. Specifically, the first winding 110 and the second winding 120 are wound on the first core 210, and the third winding 130 and the fourth winding 140 are wound on the second core 220, so that the first winding 110, the second winding 120, the third winding 130 and the fourth winding 140 are all integrated on the same magnetic core, the magnetic core has the first core 210 in a shape of a Chinese character 'kou' and the second core 220 in a shape of a Chinese character 'U', and the opening of the second core 220 faces the first core 210. Based on this, through using filter inductance and transformer in power conversion circuit through the integrated mode of magnetism, this integrated mode of magnetism realizes filter inductance and transformer function unification through the multiplexing realization of magnetic circuit to reduce the magnetic core volume, make whole power conversion circuit can save the space that will occupy. Furthermore, the fourth winding 140 is used as a filter inductor current detection winding to induce current on the power conversion circuit according to the magnetic circuit mutual coupling principle, and the coupling branch where the fourth winding 140 is located is connected to the detection circuit, so that the detection circuit can be used as a sample of the input current of the power conversion circuit, and can also be used as input overcurrent protection of the power conversion circuit.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.

Claims (15)

1. A power conversion circuit, comprising:
a transformer including a first winding and a second winding;
the rectification energy storage circuit is arranged on the input side of the transformer;
the rectification filter circuit is arranged on the output side of the transformer and comprises a filter inductor, and the filter inductor comprises a third winding;
the first winding, the second winding and the third winding are wound on the same magnetic core, the magnetic core comprises a closed first core body and an open second core body, the opening of the second core body faces the first core body, the first winding and the second winding are wound on the first core body, and the third winding is wound on the second core body.
2. The power conversion circuit of claim 1, wherein: the rectification energy storage circuit comprises a first discharge resistor, a second discharge resistor, a first capacitor, a second capacitor, a first MOS (metal oxide semiconductor) tube, a second MOS tube, a third diode, a fourth diode and an energy storage capacitor, wherein the first discharge resistor is connected with the first capacitor in parallel, the second discharge resistor is connected with the second capacitor in parallel, the third diode is connected with the first MOS tube in reverse parallel, the fourth diode is connected with the second MOS tube in reverse parallel, the first capacitor is connected with the second capacitor in series to form a first branch circuit, the first MOS tube is connected with the second MOS tube in series to form a second branch circuit, the first branch circuit is connected with the second branch circuit in parallel, and the second branch circuit is connected with the input side of the transformer through the energy storage capacitor.
3. The power conversion circuit of claim 2, wherein: the rectification filter circuit comprises a first diode, a second diode, a filter inductor and a filter capacitor, wherein the first diode and the second diode form a half-bridge rectification circuit, and the half-bridge rectification circuit is connected to a load through the filter inductor and the filter capacitor.
4. The power conversion circuit of claim 1, wherein: one end of the second core is connected with the first core, and the other end of the second core is provided with a single-section air gap or a multi-section air gap;
or both ends of the second core body are provided with single-section air gaps;
or both ends of the second core are connected with the first core.
5. The power conversion circuit of claim 1, wherein: the third winding is wound in the middle of the second core body.
6. The power conversion circuit of claim 1, wherein: the second core body is provided with a second center pillar, and the third winding is wound on the second center pillar.
7. The power conversion circuit of claim 6, wherein: a single-section air gap is arranged between the second center pillar and the first core.
8. The power conversion circuit according to any one of claims 1 to 7, wherein: the first winding and the second winding are wound on two sides of the first core body respectively.
9. The power conversion circuit according to any one of claims 1 to 7, wherein: the first core is provided with a first center pillar, and the first winding and the second winding are wound on the first center pillar.
10. The power conversion circuit of claim 1, wherein: the detection circuit comprises a fourth winding coupled with the third winding, and the fourth winding is wound on the second core body.
11. The power conversion circuit of claim 10, wherein: the third winding and the fourth winding are wound in the middle of the second core body.
12. The power conversion circuit of claim 10, wherein: the third winding and the fourth winding are respectively wound at two ends of the second core body.
13. The power conversion circuit of claim 10, wherein: the second core body is provided with a second center pillar, and the third winding and the fourth winding are wound on the second center pillar.
14. A circuit board comprising the power conversion circuit according to any one of claims 1 to 13.
15. An air conditioner characterized by comprising the power conversion circuit according to any one of claims 1 to 13.
CN202022319504.3U 2020-10-16 2020-10-16 Power conversion circuit, circuit board and air conditioner Active CN213305284U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202022319504.3U CN213305284U (en) 2020-10-16 2020-10-16 Power conversion circuit, circuit board and air conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022319504.3U CN213305284U (en) 2020-10-16 2020-10-16 Power conversion circuit, circuit board and air conditioner

Publications (1)

Publication Number Publication Date
CN213305284U true CN213305284U (en) 2021-05-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202022319504.3U Active CN213305284U (en) 2020-10-16 2020-10-16 Power conversion circuit, circuit board and air conditioner

Country Status (1)

Country Link
CN (1) CN213305284U (en)

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