CN201878029U - Switching power supply - Google Patents
Switching power supply Download PDFInfo
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- CN201878029U CN201878029U CN2010206724324U CN201020672432U CN201878029U CN 201878029 U CN201878029 U CN 201878029U CN 2010206724324 U CN2010206724324 U CN 2010206724324U CN 201020672432 U CN201020672432 U CN 201020672432U CN 201878029 U CN201878029 U CN 201878029U
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- power supply
- switching power
- resonance circuit
- control
- transformer
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- 239000003990 capacitor Substances 0.000 claims abstract description 36
- 238000004804 winding Methods 0.000 claims description 30
- 238000001914 filtration Methods 0.000 claims description 23
- 230000005669 field effect Effects 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The embodiment of the utility model discloses a switching power supply, which comprises a control integrated circuit (IC) and a filter capacitor, and also comprises at least two groups of half-bridge resonant circuits which are mutually connected in parallel to form a logical link control (LLC) resonant circuit of the switching power supply, wherein an input end of the LLC resonant circuit is connected with the control IC, and an output end of LLC is connected with the filter capacitor. In the utility model, the requirements of output power needed by the high-power switching power supply can be met by selecting components with smaller specifications, the circuit structure is simple, the cost is lower, and the stability and reliability of the switching power supply are higher.
Description
Technical field
The utility model relates to power technique fields, relates in particular to a kind of Switching Power Supply.
Background technology
Switching Power Supply is to utilize modern power electronic to learn, and the time ratio that the control switch pipe turns on and off is kept a kind of power supply of regulated output voltage.
See also Fig. 1, be the electrical block diagram of existing high power switching power supply; As shown in Figure 1, existing high power switching power supply comprises power supply, control IC (Integrated Circuit, surface-mounted integrated circuit), MosFET (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-oxide layer-semiconductor-field-effect transistor, be called for short field-effect transistor) M1 and M2, the transformer T that comprises elementary winding and secondary winding, resonant capacitance C, full-wave rectification diode DS1 and DS2 and two capacitor C S1 parallel with one another and CS2, CS1 and CS2 constitute filtering capacitor jointly.Wherein, M1 and the M2 formation switch element that is connected in series, the input of this switch element is connected with control IC, under the control of control IC, turn on and off, the output of this switch element is connected to the elementary winding of transformer T, one group of half-bridge resonance circuit of the common formation of this M1, M2, T and resonance capacitor C, and this half-bridge resonance circuit constitutes LLC (the Logical LinkControl of Switching Power Supply, logic link control) resonance circuit is as the output loop of Switching Power Supply; The secondary winding of transformer T connects the anode of DS1 and DS2, and the negative electrode of DS1 and DS2 is connected to filtering capacitor as output.
In the specific implementation, control IC provides drive signal, control M1 and M2 turn on and off, M1 and M2 turn on and off, make resonant capacitance C charge/discharge, thus the current drives that the elementary winding that makes transformer T is produced by the charge/discharge of resonant capacitance C, from the secondary winding power output, after DS1 and DS2 rectification, again by exporting after the filtering capacitor filtering.
The inventor finds, adopt one group of half-bridge resonance circuit to constitute the LLC resonance circuit of Switching Power Supply in the existing high power switching power supply, output loop as Switching Power Supply, in this scheme, satisfying under the prerequisite of high-power output, need the transformer T that selects for use magnetic core bigger in the LLC resonance circuit, need the MosFET that selects for use rated current bigger simultaneously, could guarantee the stability and the reliability of Switching Power Supply, and satisfy the components and parts of above-mentioned big specification, its cost is higher, has reduced the practicality of Switching Power Supply; In addition, owing to be subjected to the restriction of components and parts specification, existing scheme can't satisfy power demand ultra-thin, high-power Switching Power Supply, thus reduced practicality.
The utility model content
The utility model embodiment technical problem to be solved is, a kind of Switching Power Supply is provided, selects for use the less components and parts of specification can satisfy the required power output of high power switching power supply, its line construction is simple, cost is lower, and the stability of Switching Power Supply and reliability are higher.
In order to solve the problems of the technologies described above, the utility model embodiment provides a kind of Switching Power Supply, comprising: control IC and filtering capacitor also comprise:
At least two group half-bridge resonance circuits, described respectively to organize the half-bridge resonance circuit parallel with one another, constitutes the LLC resonance circuit of described Switching Power Supply;
The input of described LLC resonance circuit is connected with described control IC, and the output of described LLC is connected with described filtering capacitor.
Wherein, described half-bridge resonance circuit comprises: two field-effect transistors that are connected in series, a transformer and a resonant capacitor.
Wherein, described transformer comprises elementary winding and secondary winding.
Wherein, described two field-effect transistors that are connected in series constitute switch element, and the input of described switch element is connected with described control IC, and the output of described switch element is connected to the elementary winding of described transformer by described resonant capacitor.
Wherein, described Secondary winding of transformer is connected with two full-wave rectification diodes, the anode of described two full-wave rectification diodes is connected to described Secondary winding of transformer, and the negative electrode of described two full-wave rectification diodes is connected to described filtering capacitor as the output of described half-bridge resonance circuit.
Wherein, described filtering capacitor constitutes by two electric capacity is parallel with one another.
Implement the utility model embodiment, have following beneficial effect:
The utility model embodiment is on the basis of existing Switching Power Supply, adopt two groups or more half-bridge resonance circuit parallel with one another to constitute the LLC resonance circuit of Switching Power Supply jointly, half-bridge resonance circuit parallel with one another is on average shared the required power output of whole Switching Power Supply, alleviated the burden of every group of half-bridge resonance circuit, use the small dimension components and parts can satisfy the power requirement of every group of half-bridge resonance circuit, thereby reduced production cost; Simultaneously, adopt the output loop of the LLC resonance circuit of half-bridge resonance circuit formation parallel with one another as Switching Power Supply, the structure of its whole circuit is simple relatively, and can improve the stability and the reliability of Switching Power Supply, thereby has improved the practicality of Switching Power Supply.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the electrical block diagram of existing high power switching power supply;
Fig. 2 is the electrical block diagram of the embodiment of Switching Power Supply of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
See also Fig. 2, be the electrical block diagram of the embodiment of Switching Power Supply of the present utility model; Described Switching Power Supply comprises:
Control IC 10 is used for the drive signal of control switching, and particularly, described control IC 10 is used to provide drive signal, and the MosFET in the control half-bridge resonance circuit turns on and off;
Two groups of half-bridge resonance circuits 20 (only one being carried out label among the figure), described respectively to organize the half-bridge resonance circuit parallel with one another, constitutes the LLC resonance circuit of described Switching Power Supply;
Filtering capacitor 30, described filtering capacitor 30 are by two capacitor C 3 and C4 is parallel with one another constitutes, and are used for the various noise signals of filtering Switching Power Supply, reach filter action and suppress the effect of noise.
As described in Figure 2, the input of the LLC resonance circuit that described two groups of half-bridge resonance circuits 20 constitute is connected with described control IC 10, and the output of described LLC is connected with described filtering capacitor 30.
Described half-bridge resonance circuit 20 comprises: two field-effect transistors that are connected in series, a transformer and a resonant capacitor.
Further referring to Fig. 2, wherein one group of half-bridge resonance power supply 20 comprises: two MosFET manage Q1 and Q2, transformer T1 and resonant capacitor C1.Wherein, transformer T1 comprises elementary winding and secondary winding; Q1 and the Q2 formation switch element that is connected in series mutually, the input of this switch element (end after Q1 and the Q2 series connection) is connected with control IC 10, the control of controlled IC10 and turning on and off, the output of this switch element (other end after Q1 and the Q2 series connection) is connected to the elementary winding of described transformer T1 by resonant capacitor C1; The secondary winding of transformer T1 is connected with two full-wave rectification diode D1 and D2, and the anode of D1 and D2 is connected to the secondary winding of transformer T1, and the negative electrode of D1 and D2 then is connected to filtering capacitor 30 as the output of this group half-bridge resonance circuit 20.
Another group half-bridge resonance circuit 20 comprises: two MosFET manage Q3 and Q4, transformer T2 and resonant capacitor C2.Wherein, transformer T2 comprises elementary winding and secondary winding; Q3 and the Q4 formation switch element that is connected in series mutually, the input of this switch element (end after Q3 and the Q4 series connection) is connected with control IC 10, the control of controlled IC10 and turning on and off, the output of this switch element (other end after Q3 and the Q4 series connection) is connected to the elementary winding of described transformer T2 by resonant capacitor C2; The secondary winding of transformer T2 is connected with two full-wave rectification diode D3 and D4, and the anode of D3 and D4 is connected to the secondary winding of transformer T2, and the negative electrode of D3 and D4 then is connected to filtering capacitor 30 as the output of this group half-bridge resonance circuit 20.
To the assembling and the operating principle of Switching Power Supply of the present utility model be described in detail below.
Needed each components and parts of Switching Power Supply are connected according to circuit structure shown in Figure 2, promptly finished the assembling process of Switching Power Supply of the present utility model.
Control IC 10 provides drive signal, simultaneously the MosFET in two groups of half-bridge resonance circuits 20 is controlled, Q1 and Q2 in first group of half-bridge resonance circuit 20 turn on and off under the control of control IC 10, make resonant capacitor C1 charge/discharge, thereby the current drives that the elementary winding that makes transformer T1 is produced by the charge/discharge of resonant capacitance C1, from the secondary winding power output, after D1 and D2 rectification, output to filtering capacitor 30 again; Q3 and Q4 in second group of half-bridge resonance circuit 20 turn on and off under the control of control IC 10, make resonant capacitor C2 charge/discharge, thereby the current drives that the elementary winding that makes transformer T2 is produced by the charge/discharge of resonant capacitance C2, from the secondary winding power output, after D3 and D4 rectification, output to filtering capacitor 30 again; Because 10 pairs of two groups of half-bridge resonance circuits 20 of control IC start to control simultaneously, therefore, the power of two groups of half-bridge resonance circuit 20 outputs transfers to filtering capacitor 30 simultaneously, exports after filtering capacitor 30 filtering.
In the present embodiment, adopt a control IC 10 to control the LLC resonance circuit that two groups of half-bridge resonance circuits 20 constitute simultaneously, two groups of half-bridge resonance circuits 20 can on average be shared the required power output of whole Switching Power Supply, therefore, use the small dimension components and parts can satisfy the power requirement of every group of half-bridge resonance circuit, in the present embodiment, selected components and parts specification can be the 50%-60% of each components and parts specification in the existing scheme, thereby reduced the acquisition cost of components and parts, can guarantee simultaneously the stability and the reliability of Switching Power Supply, be more suitable in ultra-thin, the power demand of high-power Switching Power Supply.
Need to prove, present embodiment adopts two groups of half-bridge resonance circuits to constitute the LLC resonance circuit only for giving an example, can also adopt two groups of above half-bridge resonance circuits to constitute the LLC resonance circuit, when the half-bridge resonance circuit of employing more than two groups constitutes the LLC resonance circuit, need consider respectively to organize the coupled problem between the half-bridge resonance circuit, in order to guarantee the stability of Switching Power Supply, preferably adopt two groups or the three groups of half-bridge resonance circuit LLC of formation in parallel resonance circuits.In addition, present embodiment adopts a control IC to control two groups of half-bridge resonance circuits also only for giving an example, it can also adopt a plurality of control IC, control every group of half-bridge resonance circuit respectively, but when adopting a plurality of control IC, need to consider the cost problem of Switching Power Supply, preferably adopt a control IC that each group half-bridge resonance circuit is started to control simultaneously.Further, the concrete specification of each components and parts is determined by the required power of reality in the present embodiment, adopt the scheme of present embodiment, under equal power condition, the specification of the components and parts that it is selected is the 50%-60% of each components and parts specification in the existing scheme, certainly, when the formation in parallel of the half-bridge resonance circuit more than two groups LLC resonance circuit, according to the principle of mean allocation, each components and parts specification then can further reduce, but similar analysis under these situations is not given unnecessary details at this.
The utility model embodiment is on the basis of existing Switching Power Supply, adopt two groups or more half-bridge resonance circuit parallel with one another to constitute the LLC resonance circuit of Switching Power Supply jointly, half-bridge resonance circuit parallel with one another is on average shared the required power output of whole Switching Power Supply, alleviated the burden of every group of half-bridge resonance circuit, use the small dimension components and parts can satisfy the power requirement of every group of half-bridge resonance circuit, thereby reduced production cost; Simultaneously, adopt the output loop of the LLC resonance circuit of half-bridge resonance circuit formation parallel with one another as Switching Power Supply, the structure of its whole circuit is simple relatively, and can improve the stability and the reliability of Switching Power Supply, thereby has improved the practicality of Switching Power Supply.
Above disclosed only is a kind of preferred embodiment of the utility model, certainly can not limit the interest field of the utility model with this, one of ordinary skill in the art will appreciate that all or part of flow process that realizes the foregoing description, and according to the equivalent variations that the utility model claim is done, the scope that still belongs to utility model and contained.
Claims (6)
1. Switching Power Supply comprises: control IC and filtering capacitor, it is characterized in that, and also comprise:
At least two group half-bridge resonance circuits, described respectively to organize the half-bridge resonance circuit parallel with one another, constitutes the LLC resonance circuit of described Switching Power Supply;
The input of described LLC resonance circuit is connected with described control IC, and the output of described LLC is connected with described filtering capacitor.
2. Switching Power Supply as claimed in claim 1 is characterized in that, described half-bridge resonance circuit comprises: two field-effect transistors that are connected in series, a transformer and a resonant capacitor.
3. Switching Power Supply as claimed in claim 2 is characterized in that described transformer comprises elementary winding and secondary winding.
4. Switching Power Supply as claimed in claim 3 is characterized in that:
Described two field-effect transistors that are connected in series constitute switch element, and the input of described switch element is connected with described control IC, and the output of described switch element is connected to the elementary winding of described transformer by described resonant capacitor.
5. Switching Power Supply as claimed in claim 4 is characterized in that:
Described Secondary winding of transformer is connected with two full-wave rectification diodes, the anode of described two full-wave rectification diodes is connected to described Secondary winding of transformer, and the negative electrode of described two full-wave rectification diodes is connected to described filtering capacitor as the output of described half-bridge resonance circuit.
6. as each described Switching Power Supply of claim 1-5, it is characterized in that described filtering capacitor constitutes by two electric capacity is parallel with one another.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206724324U CN201878029U (en) | 2010-12-15 | 2010-12-15 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206724324U CN201878029U (en) | 2010-12-15 | 2010-12-15 | Switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201878029U true CN201878029U (en) | 2011-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206724324U Expired - Fee Related CN201878029U (en) | 2010-12-15 | 2010-12-15 | Switching power supply |
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| CN (1) | CN201878029U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113452260A (en) * | 2021-07-06 | 2021-09-28 | 安徽工业大学 | Hybrid LLC resonant converter topological structure based on working mode switching and control method |
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2010
- 2010-12-15 CN CN2010206724324U patent/CN201878029U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113452260A (en) * | 2021-07-06 | 2021-09-28 | 安徽工业大学 | Hybrid LLC resonant converter topological structure based on working mode switching and control method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110622 Termination date: 20121215 |