CN110957919A - Half-bridge magnetic integrated drive circuit and DC/DC power supply - Google Patents
Half-bridge magnetic integrated drive circuit and DC/DC power supply Download PDFInfo
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- CN110957919A CN110957919A CN201911113645.5A CN201911113645A CN110957919A CN 110957919 A CN110957919 A CN 110957919A CN 201911113645 A CN201911113645 A CN 201911113645A CN 110957919 A CN110957919 A CN 110957919A
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
Abstract
The invention provides a half-bridge magnetic integrated drive circuit and a DC/DC power supply, wherein the half-bridge magnetic integrated drive circuit comprises: the power circuit comprises a power circuit and a signal control circuit, wherein a main power transformer in the power circuit and an isolation transformer in the signal control circuit share the same magnetic core; the magnetic core is an E-shaped magnetic core, the E-shaped magnetic core comprises a first magnetic core and a second magnetic core, the first magnetic core is a central column of the E-shaped magnetic core, and the second magnetic core is a first side body and a second side body which are connected with the central column and located on two sides of the central column in the E-shaped magnetic core; the main power transformer winding is wound on one of the first magnetic core and the second magnetic core of the E-shaped magnetic core, and the isolation transformer winding is wound on the other of the first magnetic core and the second magnetic core of the E-shaped magnetic core, so that the size of a DC/DC power supply applying the half-bridge magnetic integrated drive circuit is reduced.
Description
Technical Field
The invention relates to the technical field of integrated circuits, in particular to a half-bridge magnetic integrated drive circuit and a DC/DC power supply of a DC/DC half-bridge synchronous rectification converter.
Background
The DC/DC power supply is a DC power supply voltage conversion device, and as a low-power DC/DC power supply product is continuously developed towards integration, a magnetic device becomes a main factor for limiting the size of the product, wherein the magnetic device is a main device for energy storage and conversion, electrical isolation and filtering in the DC/DC power supply.
Fig. 1 is a schematic diagram of a conventional half-bridge synchronous rectifier converter circuit in the prior art, and referring to fig. 1, the main magnetic devices in the circuit structure are a transformer T1 on a power circuit, an inductor L1, and an isolation driving transformer T2 on a signal control circuit. These three main magnetic devices occupy approximately 40% of the total volume of the half-bridge synchronous rectifier converter, and therefore, the volume of the magnetic devices directly affects the miniaturized design of the converter.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a half-bridge magnetic integrated driving circuit and a DC/DC power supply to reduce the size of the DC/DC power supply.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a half-bridge magnetic integrated drive circuit comprising a power circuit and a signal control circuit, comprising:
the main power transformer in the power circuit and the isolation transformer in the signal control circuit share the same magnetic core;
the magnetic core is an E-shaped magnetic core, the E-shaped magnetic core comprises a first magnetic core and a second magnetic core, the first magnetic core is a central column of the E-shaped magnetic core, and the second magnetic core is a first side body and a second side body which are connected with the central column and located on two sides of the central column in the E-shaped magnetic core;
the main power transformer winding is wound around one of the first and second cores of the E-core, and the isolation transformer winding is wound around the other of the first and second cores of the E-core.
Optionally, in the half-bridge magnetic integrated drive circuit, a magnetic field generated by a winding of the isolation transformer on the first side body on the center post is recorded as a first magnetic field;
the magnetic field generated on the center post by the winding of the isolation transformer on the second side body is marked as a second magnetic field;
the first magnetic field and the second magnetic field are opposite in direction.
Optionally, in the half-bridge magnetic integrated driving circuit, the E-shaped magnetic core includes: a first and a second symmetric sub-E-cores, each sub-E-core comprising the first and the second cores;
a main winding of the main power transformer is wound on a first magnetic core of the first sub E-shaped magnetic core along a first direction;
the secondary winding of the main power transformer is wound on the first magnetic core of the second sub E-shaped magnetic core along a second direction;
a part of the main winding of the isolation transformer is wound on the first side body of the first sub E-shaped magnetic core along a first direction, and the other part of the main winding of the isolation transformer is wound on the second side body of the first sub E-shaped magnetic core along a second direction;
and one part of secondary winding of the isolation transformer is wound on the first side body of the second sub E-shaped magnetic core along the second direction, and the other part of secondary winding of the isolation transformer is wound on the second side body of the second sub E-shaped magnetic core along the first direction.
Optionally, in the half-bridge magnetic integrated drive circuit, the number of turns of the main winding of the isolation transformer on the first side body of the first sub-E-shaped magnetic core is the same as the number of turns of the main winding of the isolation transformer on the second side body of the first sub-E-shaped magnetic core;
the number of turns of the secondary winding of the isolation transformer on the first side body of the second sub-E-shaped magnetic core is the same as the number of turns of the secondary winding of the isolation transformer on the second side body of the second sub-E-shaped magnetic core.
Optionally, in the half-bridge magnetic integrated drive circuit, the power circuit further includes:
the filter circuit comprises a first capacitor, a second capacitor, a filter capacitor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube and a first inductor;
the second end of the first capacitor is connected with the first end of the second capacitor, the first end of the first capacitor is used as the positive input end of the power circuit, and the second end of the second capacitor is used as the negative input end of the power circuit;
the first end of the first switch tube is connected with the first end of the first capacitor, the first end of the second switch tube is connected with the second end of the first switch tube, and the second end of the second switch tube is connected with the second end of the second capacitor;
a first end of a main winding of the main power transformer is connected with a second end of the second capacitor, and a second end of the main winding of the main power transformer is connected with a second end of the first switching tube;
the first end of the third switching tube is connected with the third end of the secondary winding of the main power transformer, and the second end of the third switching tube is grounded;
the first end of the fourth switching tube is connected with the first end of the secondary winding of the main power transformer, and the second end of the fourth switching tube is grounded;
a first end of the first inductor is connected with a second end of a secondary winding of the main power transformer, and the second end of the first inductor is used as an output end of the power circuit;
and the first end of the filter capacitor is connected with the second end of the first inductor, and the second end of the filter capacitor is grounded.
Optionally, in the half-bridge magnetic integrated driving circuit, the signal control circuit further includes:
a drive circuit and a half-bridge controller;
a first control signal output end of the driving circuit is connected with a control end of the first switch tube, and a second control signal output end of the driving circuit is connected with a control end of the second switch tube;
a first half-bridge signal output end of the driving circuit is connected with a first end of a main winding of the isolation transformer, and a second half-bridge signal output end of the driving circuit is connected with a second end of the main winding of the isolation transformer;
a first control signal output end of the half-bridge controller is connected with a control end of the third switching tube, and a second control signal output end of the half-bridge controller is connected with a control end of the fourth switching tube;
and the first input end of the half-bridge controller is connected with the first end of the secondary winding of the isolation transformer, and the second input end of the half-bridge controller is connected with the second end of the secondary winding of the isolation transformer.
Optionally, in the half-bridge magnetic integrated driving circuit, the driving circuit is configured to control the power circuit to switch between a first mode, a second mode, a third mode, and a fourth mode in sequence according to a clock signal;
the first mode is a mode in which the first switch tube is switched on, the second switch tube is switched off, the third switch tube is switched off and the fourth switch tube is switched on;
the second mode is a mode that the first switch tube is turned off, the second switch tube is turned off, the third switch tube is turned off and the fourth switch tube is turned on;
the third mode is a mode that the first switch tube is turned off, the second switch tube is turned on, the third switch tube is turned on and the fourth switch tube is turned off;
the fourth mode is a mode that the first switch tube is turned off, the second switch tube is turned off, and the third switch tube is turned on and the fourth switch tube is turned off.
A DC/DC power supply comprising a half-bridge magnetic integrated drive circuit as claimed in any preceding claim.
Based on the above technical solution, in the above solution provided in the embodiment of the present invention, by using two side bodies of the E-shaped magnetic core, the two side bodies are also used as magnetic cores of transformers, and the windings are disposed on the two side bodies, so that the main power transformer and the isolation transformer in the half-bridge magnetic integrated drive circuit share one magnetic core on the E-shaped magnetic core, and therefore, compared with the prior art in which two transformers respectively have independent magnetic cores, the size of the E-shaped magnetic core is smaller, the size of a magnetic device in the DC/DC power supply is reduced, and the size of the DC/DC power supply is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a conventional half-bridge synchronous rectifier converter circuit;
FIG. 2 is a schematic structural diagram of a half-bridge magnetic integrated driving circuit disclosed in an embodiment of the present application;
FIG. 3 is a schematic diagram of an E-core configuration;
fig. 4 is a schematic diagram illustrating a winding manner of a winding of the isolation transformer on the E-shaped magnetic core according to an embodiment of the disclosure;
fig. 5 is a schematic diagram of winding of the isolation transformer on the E-core according to another embodiment of the disclosure;
fig. 6 is a schematic diagram illustrating a winding manner of windings of a main power transformer and an isolation transformer on the E-shaped magnetic core according to an embodiment of the present application;
fig. 7 is a timing diagram of states of a first switch tube in a half-bridge magnetic integrated drive circuit according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to reduce the size of the DC/DC power supply in the prior art, the present application discloses a half-bridge magnetic integrated drive circuit with a smaller size, which can include a power circuit 100 and a signal control circuit 200, referring to fig. 2, wherein a main power transformer in the power circuit 100 and an isolation transformer in the signal control circuit 200 share the same magnetic core, and a transformer T1 having a first main winding, a second main winding, a first secondary winding matched with the first main winding, and a second secondary winding matched with the second main winding is provided in the half-bridge magnetic integrated drive circuit. And taking the first main winding and the first secondary winding as a main winding and a secondary winding of a main power transformer, and taking the second main winding and the second secondary winding as a main winding and a secondary winding of the isolation transformer.
In the technical scheme disclosed in the embodiment of the application, magnetic core among the half-bridge magnetism integrated drive circuit is traditional E type magnetic core, E type magnetic core can have center post structure, and with the center post links to each other and is located the first side body and the second side body of center post both sides, center post, first side body and second side body all can regard as the magnetic core to use, in this application, will the center post is defined as first magnetic core, will first side body and second side body are defined as the second magnetic core.
Referring to fig. 3, in the transformer of the prior art, when the E-shaped magnetic core is used, the winding of the transformer is usually concentrated on the center pole of the E-shaped magnetic core, and the first side body and the second side body on both sides of the center pole are not wound with the winding although they can provide the magnetic circuit. This application is through utilizing two side bodies of E type magnetic core makes these two side bodies also regard as the magnetic core of transformer, sets up the winding on these two side bodies, has realized integratedly setting up two transformers on same E type magnetic core, because two transformers (main power transformer and isolation transformer) share a magnetic core, consequently, it has independent magnetic core respectively compared two transformers among the prior art, and the volume is less, has reduced magnetic device's volume in the DC/DC power to the volume of DC/DC power has been reduced.
In the technical solution disclosed in the above embodiment of the present application, whether the winding of the main power transformer is disposed on the first core of the E-shaped magnetic core or the winding of the isolation transformer is wound on the first core may be selected according to the user's requirement, that is, in the present aspect, the main power transformer winding is wound on one of the first and second magnetic cores of the E-shaped magnetic core, a winding of the isolation transformer is wound around the other of the first and second cores of the E-shaped core, for example, winding the main power transformer winding around a first of the E-cores, winding the isolation transformer winding around a second of the E-cores, or, the main power transformer winding is wound on the second magnetic core of the E-shaped magnetic core, and the winding of the isolation transformer is wound on the first magnetic core of the E-shaped magnetic core.
In the technical solutions disclosed in the embodiments of the present application, the following modes are taken as examples to explain the present solution: and winding the main power transformer winding on a first magnetic core of the E-shaped magnetic core, and winding the isolation transformer winding on a second magnetic core of the E-shaped magnetic core.
In this scheme, the winding on the central column of the isolation transformer is split and wound around the first side body and the second side body on both sides of the central column, and when current passes through the winding on the first side body and the second side body, magnetic fields are generated on the central column, as shown in fig. 4, if the winding directions of the windings on the first side body and the second side body are the same, the directions of the magnetic fields generated on the central column by the windings on the first side body and the second side body are the same, and the two magnetic fields are superposed with each other, as shown by the arrow on the central column in fig. 4, and cannot be offset on the central column, so that the current on the winding on the central column (current on the winding of the main power transformer) is affected, therefore, in this scheme, after the winding direction of the winding is changed by modifying the winding direction of the winding on the first side body or the second side body, the direction of the induced magnetic field generated by the magnetic field generator can be changed, so that the induced magnetic fields generated by the windings on the two side bodies on the central column can be mutually offset, and therefore, the arrangement mode of the windings of the isolation transformer on the first side body and the second side body can be set according to the following principle:
the magnetic field generated on the center post by the winding of the isolation transformer on the first side body is marked as a first magnetic field;
the magnetic field generated on the center post by the winding of the isolation transformer on the second side body is marked as a second magnetic field;
the first magnetic field and the second magnetic field are opposite in direction.
Specifically, referring to fig. 5, in the technical solution disclosed in the embodiment of the present application, a part of the winding of the isolation transformer is wound on the first side body of the E-shaped magnetic core along a first direction, and another part of the winding of the isolation transformer is wound on the first side body of the E-shaped magnetic core along a second direction, where the first direction and the second direction are opposite, so that the winding on the first side body and the winding on the second side body generate magnetic fields on the central column in opposite directions, where the first direction and the second direction specifically refer to the incoming and outgoing directions of the corresponding side bodies when the winding is wound.
Each transformer has a primary winding and a secondary winding, and therefore the magnetic cores of the transformers are also present in pairs, i.e. in the above solution, the E-core comprises: a first and a second symmetric sub-E-cores, each sub-E-core comprising the first and the second magnetic core. When the winding is set, the opening directions of the first sub-E-shaped magnetic core and the second sub-E-shaped magnetic core are right opposite, the first side body of the first sub-E-shaped magnetic core and the first side body of the second sub-E-shaped magnetic core are right opposite, the second side body of the first sub-E-shaped magnetic core and the second side body of the second sub-E-shaped magnetic core are right opposite, specifically, referring to fig. 6, when the windings of the main power transformer and the lattice force transformer are arranged on the E-shaped magnetic core, the following winding mode is adopted:
a main winding of the main power transformer is wound on a first magnetic core of the first sub E-shaped magnetic core along a first direction;
the secondary winding of the main power transformer is wound on the first magnetic core of the second sub E-shaped magnetic core along a second direction;
a part of the main winding of the isolation transformer is wound on the first side body of the first sub E-shaped magnetic core along a first direction, and the other part of the main winding of the isolation transformer is wound on the second side body of the first sub E-shaped magnetic core along a second direction;
and one part of secondary winding of the isolation transformer is wound on the first side body of the second sub E-shaped magnetic core along the second direction, and the other part of secondary winding of the isolation transformer is wound on the second side body of the second sub E-shaped magnetic core along the first direction.
In the technical solution disclosed in the embodiment of the present application, in order to completely cancel the magnetic field generated by the winding on the first side body and the magnetic field generated by the winding on the second side body, in this solution, the number of turns of the main winding of the isolation transformer on the first side body of the first sub-E-shaped magnetic core is the same as the number of turns of the main winding of the isolation transformer on the second side body of the first sub-E-shaped magnetic core; the number of turns of the secondary winding of the isolation transformer on the first side body of the second sub-E-shaped magnetic core is the same as the number of turns of the secondary winding of the isolation transformer on the second side body of the second sub-E-shaped magnetic core, and at the moment, magnetic fields generated by the first side body and the second side body on the central column can be completely offset.
In addition, the present application also discloses a specific structure of the power circuit 100, referring to fig. 2, the power circuit 100 further includes:
the filter circuit comprises a first capacitor C1, a second capacitor C2, filter capacitors C3 and C4, a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4 and a first inductor L1;
a second end of the first capacitor C1 is connected to a first end of the second capacitor C2, a first end of the first capacitor C1 serves as a positive input terminal of the power circuit 100, and a second end of the second capacitor C2 serves as a negative input terminal of the power circuit 100;
a first terminal of the first switch Q1 is connected to a first terminal of the first capacitor C1, a first terminal of the second switch Q2 is connected to a second terminal of the first switch Q1, and a second terminal of the second switch Q2 is connected to a second terminal of the second capacitor C2;
a first end of a main winding of the main power transformer is connected with a second end of the second capacitor C2, and a second end of the main winding of the main power transformer is connected with a second end of the first switch tube Q1;
a first end of the third switching tube Q3 is connected with a third end of the secondary winding of the main power transformer, and a second end of the third switching tube Q3 is grounded;
a first end of the fourth switching tube Q4 is connected to a first end of the secondary winding of the main power transformer, and a second end of the fourth switching tube Q4 is grounded;
a first end of the first inductor L1 is connected to a second end of the secondary winding of the main power transformer, and a second end of the first inductor L1 is used as an output end of the power circuit 100;
first ends of the filter capacitors C3 and C4 are connected with a second end of the first inductor L1, and second ends of the filter capacitors C3 and C4 are grounded.
In addition, the present application further discloses a schematic structural diagram of a signal control circuit 200, and referring to fig. 1, the signal control circuit 200 further includes:
a drive circuit and a half-bridge controller;
a first control signal output end of the driving circuit is connected with a control end of the first switch tube Q1, and a second control signal output end of the driving circuit is connected with a control end of the second switch tube Q2;
a first half-bridge signal output end of the driving circuit is connected with a first end of a main winding of the isolation transformer, and a second half-bridge signal output end of the driving circuit is connected with a second end of the main winding of the isolation transformer;
a first control signal output end of the half-bridge controller is connected with a control end of the third switching tube Q3, and a second control signal output end of the half-bridge controller is connected with a control end of the fourth switching tube Q4;
and the first input end of the half-bridge controller is connected with the first end of the secondary winding of the isolation transformer, and the second input end of the half-bridge controller is connected with the second end of the secondary winding of the isolation transformer.
In the technical solution disclosed in the embodiment of the present application, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, and the fourth switch tube Q4 in the power circuit 100 are respectively turned on and off under the control of the driving circuit to realize that the power circuit 100 switches between the first operating mode, the second mode, the third mode, and the fourth mode, and the driving circuit controls the first switch tube, the second switch tube Q2, the third switch tube Q3, and the fourth switch tube Q4
The driving circuit is configured to control the power circuit 100 to switch between a first mode, a second mode, a third mode, and a fourth mode in sequence according to a clock signal;
the first mode is a mode that the first switch tube Q1 is turned on, the second switch tube Q2 is turned off, the third switch tube Q3 is turned off and the fourth switch tube Q4 is turned on;
the second mode is a mode in which the first switching tube Q1 is turned off, the second switching tube Q2 is turned off, the third switching tube Q3 is turned off, and the fourth switching tube Q4 is turned on;
the third mode is a mode in which the first switch tube Q1 is turned off, the second switch tube Q2 is turned on, the third switch tube Q3 is turned on, and the fourth switch tube Q4 is turned off;
the fourth mode is a mode in which the first switching tube Q1 is turned off, the second switching tube Q2 is turned off, the third switching tube Q3 is turned on, and the fourth switching tube Q4 is turned off.
In this scheme, the operation mode of the power circuit 100 is divided into four operation modes according to time nodes, and the operation modes are specifically divided as follows:
at time T0-T1, the power circuit 100 operates in the first mode, at this time, the first switch Q1 in the power circuit 100 is turned on, the second switch Q2 is turned off, the third switch Q3 is turned off, the fourth switch Q4 is turned on, current flows from the a end to the B end of the main winding of the main power transformer, at this time, the driving signal Dr1 provided by the driving circuit to the control end of the first switch Q1 is at a high level, and the voltage at the terminal Dr1-1 of the corresponding isolation transformer T2 is also at a high level.
At the time t 1-t 2, the power circuit 100 works in a second mode, at this time, dead time is obtained, the first switch tube Q1 and the second switch tube Q2 are both turned off, and the magnetic induction intensity is unchanged;
at time T2-T3, the power circuit 100 operates in the third mode, at this time, the second switching tube Q2 and the third switching tube Q3 are turned on, the first switching tube Q1 and the fourth switching tube Q4 are turned off, current flows from the end B to the end a of the main winding of the main power transformer, at this time, the driving signal Dr2 of the second switching tube Q2 is at a high level, and the terminal Dr2-1 of the corresponding isolation transformer T2 is also at a high level;
at time t 3-t 4, the power circuit 100 operates in the fourth mode, and at this time, the first switching tube Q1 and the second switching tube Q2 are turned off, and the magnetic induction intensity is unchanged, which is a complete working cycle of the main power transformer. As shown in fig. 7, the voltage waveform in one period is plotted by taking the first switching tube Q1 as an example.
According to the technical scheme, the magnetic integrated drive circuit of the half-bridge synchronous rectification converter has the advantages that the main power transformer and the drive transformer are integrated, so that the occupied volume of a magnetic device is effectively reduced, and the miniaturization of the converter is promoted.
Corresponding to the half-bridge magnetic integrated drive circuit, the application also discloses a DC/DC power supply, and the DC/DC power supply is applied with the half-bridge magnetic integrated drive circuit in any one of the embodiments of the application.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A half-bridge magnetic integrated drive circuit comprising a power circuit and a signal control circuit, comprising:
the main power transformer in the power circuit and the isolation transformer in the signal control circuit share the same magnetic core;
the magnetic core is an E-shaped magnetic core, the E-shaped magnetic core comprises a first magnetic core and a second magnetic core, the first magnetic core is a central column of the E-shaped magnetic core, and the second magnetic core is a first side body and a second side body which are connected with the central column and located on two sides of the central column in the E-shaped magnetic core;
the main power transformer winding is wound around one of the first and second cores of the E-core, and the isolation transformer winding is wound around the other of the first and second cores.
2. The half-bridge magnetic integrated drive circuit according to claim 1, wherein the magnetic field generated on the center post by the winding of the isolation transformer on the first side body is denoted as a first magnetic field;
the magnetic field generated on the center post by the winding of the isolation transformer on the second side body is marked as a second magnetic field;
the first magnetic field and the second magnetic field are opposite in direction.
3. The half-bridge magnetic integrated drive circuit of claim 2, wherein the E-core comprises: a first and a second symmetric sub-E-cores, each sub-E-core comprising the first and the second cores;
a main winding of the main power transformer is wound on a first magnetic core of the first sub E-shaped magnetic core along a first direction;
the secondary winding of the main power transformer is wound on the first magnetic core of the second sub E-shaped magnetic core along a second direction;
a part of the main winding of the isolation transformer is wound on the first side body of the first sub E-shaped magnetic core along a first direction, and the other part of the main winding of the isolation transformer is wound on the second side body of the first sub E-shaped magnetic core along a second direction;
and one part of secondary winding of the isolation transformer is wound on the first side body of the second sub E-shaped magnetic core along the second direction, and the other part of secondary winding of the isolation transformer is wound on the second side body of the second sub E-shaped magnetic core along the first direction.
4. The half-bridge magnetic integrated drive circuit of claim 3, wherein the number of turns of the main winding of the isolation transformer on the first side body of the first sub-E-core is the same as the number of turns of the main winding of the isolation transformer on the second side body of the first sub-E-core;
the number of turns of the secondary winding of the isolation transformer on the first side body of the second sub-E-shaped magnetic core is the same as the number of turns of the secondary winding of the isolation transformer on the second side body of the second sub-E-shaped magnetic core.
5. The half-bridge magnetic integrated drive circuit of claim 1, wherein the power circuit further comprises:
the filter circuit comprises a first capacitor, a second capacitor, a filter capacitor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube and a first inductor;
the second end of the first capacitor is connected with the first end of the second capacitor, the first end of the first capacitor is used as the positive input end of the power circuit, and the second end of the second capacitor is used as the negative input end of the power circuit;
the first end of the first switch tube is connected with the first end of the first capacitor, the first end of the second switch tube is connected with the second end of the first switch tube, and the second end of the second switch tube is connected with the second end of the second capacitor;
a first end of a main winding of the main power transformer is connected with a second end of the second capacitor, and a second end of the main winding of the main power transformer is connected with a second end of the first switching tube;
the first end of the third switching tube is connected with the third end of the secondary winding of the main power transformer, and the second end of the third switching tube is grounded;
the first end of the fourth switching tube is connected with the first end of the secondary winding of the main power transformer, and the second end of the fourth switching tube is grounded;
a first end of the first inductor is connected with a second end of a secondary winding of the main power transformer, and the second end of the first inductor is used as an output end of the power circuit;
and the first end of the filter capacitor is connected with the second end of the first inductor, and the second end of the filter capacitor is grounded.
6. The half-bridge magnetic integrated drive circuit of claim 5, wherein the signal control circuit further comprises:
a drive circuit and a half-bridge controller;
a first control signal output end of the driving circuit is connected with a control end of the first switch tube, and a second control signal output end of the driving circuit is connected with a control end of the second switch tube;
a first half-bridge signal output end of the driving circuit is connected with a first end of a main winding of the isolation transformer, and a second half-bridge signal output end of the driving circuit is connected with a second end of the main winding of the isolation transformer;
a first control signal output end of the half-bridge controller is connected with a control end of the third switching tube, and a second control signal output end of the half-bridge controller is connected with a control end of the fourth switching tube;
and the first input end of the half-bridge controller is connected with the first end of the secondary winding of the isolation transformer, and the second input end of the half-bridge controller is connected with the second end of the secondary winding of the isolation transformer.
7. The half-bridge magnetic integrated drive circuit of claim 6, wherein the drive circuit is configured to control the power circuit to switch between the first mode, the second mode, the third mode, and the fourth mode in sequence according to a clock signal;
the first mode is a mode in which the first switch tube is switched on, the second switch tube is switched off, the third switch tube is switched off and the fourth switch tube is switched on;
the second mode is a mode that the first switch tube is turned off, the second switch tube is turned off, the third switch tube is turned off and the fourth switch tube is turned on;
the third mode is a mode that the first switch tube is turned off, the second switch tube is turned on, the third switch tube is turned on and the fourth switch tube is turned off;
the fourth mode is a mode that the first switch tube is turned off, the second switch tube is turned off, and the third switch tube is turned on and the fourth switch tube is turned off.
8. A DC/DC power supply comprising a half-bridge magnetic integrated drive circuit as claimed in any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911113645.5A CN110957919A (en) | 2019-11-14 | 2019-11-14 | Half-bridge magnetic integrated drive circuit and DC/DC power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911113645.5A CN110957919A (en) | 2019-11-14 | 2019-11-14 | Half-bridge magnetic integrated drive circuit and DC/DC power supply |
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Effective date of registration: 20210506 Address after: 102200 No.139, Shuangying Middle Road, science and Technology Park, Changping District, Beijing Applicant after: BEIJING SUPLET POWER Co.,Ltd. Applicant after: Xi'an xinleineng Electronic Technology Co.,Ltd. Address before: 102299 Building 1, yard 139, Shuangying Middle Road, science and Technology Park, Changping District, Beijing Applicant before: BEIJING SUPLET POWER Co.,Ltd. |
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Application publication date: 20200403 |