CN102223069A - Self-driven synchronous buck converter circuit - Google Patents
Self-driven synchronous buck converter circuit Download PDFInfo
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- CN102223069A CN102223069A CN2011101732179A CN201110173217A CN102223069A CN 102223069 A CN102223069 A CN 102223069A CN 2011101732179 A CN2011101732179 A CN 2011101732179A CN 201110173217 A CN201110173217 A CN 201110173217A CN 102223069 A CN102223069 A CN 102223069A
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Abstract
The invention provides a self-driven synchronous buck converter circuit. The self-driven synchronous buck converter circuit comprises an input port, a main power metal oxide semiconductor (MOS) field-effect transistor M1, a follow current MOS field-effect transistor M2, a filter capacitor C and a filter inductor L, wherein the filter inductor L comprises main topological output filtering inductance coils and follow current MOS field-effect transistor drive coils which are coupled with each other; terminals 1 and 3 of the filter inductor L are corresponding terminals; the drain of the main power MOS field-effect transistor M1 is connected with the input port; the source of the main power MOS field-effect transistor M1 is connected with the terminal 1 of the filter inductor L; a terminal 2 of the filter inductor L is connected with one end of the filter capacitor C; the other end of the filter capacitor C is grounded; the drain of the follow current MOS field-effect transistor M2 is connected with the terminal 1 of the filter inductor L; the source of the follow current MOS field-effect transistor M2 is grounded; and the source and the grid of the follow current MOS field-effect transistor M2 are connected with terminals 3 and 4 of the filter inductor L respectively. The self-driven synchronous buck converter circuit has the advantages that: a low-side drive chip is not required; and the follow current MOS field-effect transistor drive coils of the filter inductor L can assist in driving the follow current MOS field-effect transistor, so circuit is simplified and cost is reduced.
Description
Technical field
The present invention relates to synchronous buck converter circuit, relate in particular to the semiconductor switch that has the half-bridge configuration form in a kind of high frequency DC/DC transducer, and by the self-driven synchronous buck converter circuit of complementary drive signal controlling.
Background technology
At present, the use of power supply changeover device is more and more general, and in order to obtain lower output voltage, higher electric current, transient response faster, the designer begins to adopt synchronous rectification.
The circuit diagram of existing synchronous buck converter circuit as shown in Figure 1, compare with traditional step-down controller, synchronous buck converter replaces fly-wheel diode with controlled metal-oxide-semiconductor, utilize the low on-resistance and the high-speed switch characteristic of metal-oxide-semiconductor, in the bigger application of power, can obtain lower output voltage, higher efficient and transient response faster.
As shown in Figure 1, synchronous buck converter uses the special driving chip to control two metal-oxide-semiconductors of flash and low limit usually, and the course of work is as follows:
After the supplying power for input end of synchronous buck converter, control chip and chip for driving startup work are sent the master pulse signal by control chip and are given chip for driving, and chip for driving applies the gate driving pulse of two groups of complementations again respectively to power MOS pipe M1 and M2.When power MOS pipe M1 conducting, power MOS pipe M2 closes, and at this moment main power flows into from power MOS pipe M1, and through being delivered to load resistance R behind filtering inductance L and the filter capacitor C, in this process, inductance L and capacitor C all are recharged.When power MOS pipe M1 closes, power MOS pipe M2 conducting, energy stored is via power MOS pipe M2 in the inductance L at this moment, and filter capacitor C and load resistance R obtain discharging.Ifs circuit is operated under the discontinuous mode, and so, inductance L also can anti-phase afterflow.
Therefore, each power MOS pipe all will have their work of special driving device drive in this synchronous buck converter circuit, can be independent flash chip for driving and low limit chip for driving, it also can be the chip for driving that both integrate, cause circuit comparatively complicated, component number is more, and cost is higher.
Summary of the invention
In order to solve the problems of the prior art, the invention provides a kind of self-driven synchronous buck converter circuit.
The invention provides a kind of self-driven synchronous buck converter circuit, comprise the input port that is used to receive input voltage, main power MOS pipe M1, afterflow metal-oxide-semiconductor M2, drive the flash chip for driving of described main power MOS pipe M1, filter capacitor C and filter inductance L, wherein, described filter inductance L comprises two groups of coils, wherein one group of coil is for having 1, the topological output inductor coil of the master of 2 ends, another group coil is for having 3, the afterflow metal-oxide-semiconductor drive coil of 4 ends, topological output inductor coil of described master and described afterflow metal-oxide-semiconductor drive coil intercouple, 1 of described filter inductance L, 3 ends are end of the same name, the drain electrode of described main power MOS pipe M1 is connected with described input port, the source electrode of described main power MOS pipe M1 is connected with 1 end of described filter inductance L, 2 ends of described filter inductance L are connected with the end of described filter capacitor C, the other end ground connection of described filter capacitor C, the drain electrode of described afterflow metal-oxide-semiconductor M2 is connected with 1 end of described filter inductance L, the source ground of described afterflow metal-oxide-semiconductor M2, the source electrode of described afterflow metal-oxide-semiconductor M2 is connected with 3 ends of described filter inductance L, and the grid of described afterflow metal-oxide-semiconductor M2 is connected with 4 ends of described filter inductance L.
As a further improvement on the present invention, be in series with inductance L between 3 ends of the source electrode of described afterflow metal-oxide-semiconductor M2 and described filter inductance L
Add, described inductance L
AddBe used to avoid described main power MOS pipe M1, afterflow metal-oxide-semiconductor M2 moment conducting.
As a further improvement on the present invention, described inductance L
AddAn end be connected with the source electrode of described afterflow metal-oxide-semiconductor M2, the other end is connected with the intersection point of 1 end of described filter inductance L with described main power MOS pipe M1.
As a further improvement on the present invention, described filter capacitor C is parallel with load resistance R.
As a further improvement on the present invention, the TG of described flash chip for driving end is connected with the grid of described main power MOS pipe M1, and the TS end of described flash chip for driving is connected with the source electrode of described main power MOS pipe M1.
The invention has the beneficial effects as follows: by such scheme, saved low limit chip for driving, can come process auxiliary drive afterflow metal-oxide-semiconductor, simplified circuit, reduced cost by the afterflow metal-oxide-semiconductor drive coil of filter inductance.
Description of drawings
Fig. 1 is the circuit diagram of existing synchronous buck converter circuit;
Fig. 2 is the circuit diagram of a kind of self-driven synchronous buck converter circuit of the present invention;
Topology work schematic diagram when Fig. 3 is the main power MOS pipe M1 conducting of self-driven synchronous buck converter circuit of the present invention;
Work schematic diagram when Fig. 4 is the inductance forward afterflow of self-driven synchronous buck converter circuit of the present invention;
Work schematic diagram when Fig. 5 is the reverse afterflow of the inductance of self-driven synchronous buck converter circuit of the present invention;
Fig. 6 is the drive signal waveform figure of the main power MOS pipe M1 and the afterflow metal-oxide-semiconductor M2 of self-driven synchronous buck converter circuit of the present invention.
Embodiment
The present invention is further described below in conjunction with description of drawings and embodiment.
As shown in Figure 2, a kind of self-driven synchronous buck converter circuit, comprise the input port that is used to receive the DC input voltage, be used to provide the output port of the DC output voltage of upon mediation, main power MOS pipe M1, afterflow metal-oxide-semiconductor M2, drive the flash chip for driving of described main power MOS pipe M1, filter capacitor C and filter inductance L, it wherein, described filter inductance L comprises two groups of coils, wherein one group of coil is for having 1, the topological output inductor coil of the master of 2 ends, another group coil is for having 3, the afterflow metal-oxide-semiconductor drive coil of 4 ends, topological output inductor coil of described master and described afterflow metal-oxide-semiconductor drive coil intercouple, 1 of described filter inductance L, 3 ends are end of the same name, the drain electrode of described main power MOS pipe M1 is connected with described input port, the source electrode of described main power MOS pipe M1 is connected with 1 end of described filter inductance L, 2 ends of described filter inductance L are connected with the end of described filter capacitor C, the other end ground connection of described filter capacitor C, the drain electrode of described afterflow metal-oxide-semiconductor M2 is connected with 1 end of described filter inductance L, the source ground of described afterflow metal-oxide-semiconductor M2, the source electrode of described afterflow metal-oxide-semiconductor M2 is connected with 3 ends of described filter inductance L, and the grid of described afterflow metal-oxide-semiconductor M2 is connected with 4 ends of described filter inductance L.
As shown in Figure 2, be in series with inductance L between 3 ends of the source electrode of described afterflow metal-oxide-semiconductor M2 and described filter inductance L
Add, described inductance L
AddBe used to avoid described main power MOS pipe M1, afterflow metal-oxide-semiconductor M2 moment conducting.Wherein, described inductance L
AddBe little sense value inductance.
As shown in Figure 2, described inductance L
AddAn end be connected with the source electrode of described afterflow metal-oxide-semiconductor M2, the other end is connected with the intersection point of 1 end of described filter inductance L with described main power MOS pipe M1.
As shown in Figure 2, described filter capacitor C is parallel with load resistance R.
As shown in Figure 2, the TG of described flash chip for driving end is connected with the grid of described main power MOS pipe M1, and the TS end of described flash chip for driving is connected with the source electrode of described main power MOS pipe M1.
The operation principle of a kind of self-driven synchronous buck converter circuit provided by the invention is:
1, after the flash chip for driving drives main power MOS pipe M1 conducting, as shown in Figure 3, topological output inductor coil 1 end of the master of filter inductance L induces positive voltage, voltage relationship according to end of the same name, 3 ends of the afterflow metal-oxide-semiconductor drive coil of filter inductance L also induce positive voltage, 4 ends of the afterflow metal-oxide-semiconductor drive coil of filter inductance L induce negative voltage, the afterflow metal-oxide-semiconductor drive coil of filter inductance L can make the grid of afterflow metal-oxide-semiconductor M2 bear negative voltage, thereby M2 closes with the afterflow metal-oxide-semiconductor, and input dc power is flat just successively via main power MOS pipe M1, filter inductance L, filter capacitor C is sent to load resistance R;
2, after the flash chip for driving drives main power MOS pipe M1 and closes, as shown in Figure 4,1 end of afterflow inductance L induces negative voltage, voltage relationship according to end of the same name, 3 ends of the afterflow metal-oxide-semiconductor drive coil of filter inductance L also induce negative voltage, and 4 ends of the afterflow metal-oxide-semiconductor drive coil of filter inductance L induce positive voltage.The afterflow metal-oxide-semiconductor drive coil of filter inductance L can make the grid of afterflow metal-oxide-semiconductor M2 bear forward voltage, thereby makes afterflow metal-oxide-semiconductor M2 conducting, and filter inductance L is just successively by filter capacitor C, load resistance R, afterflow metal-oxide-semiconductor M2 and inductance L
AddFinish afterflow;
If 3 loads are lighter, the inductive current interrupter duty, as shown in Figure 5, afterflow inductance afterflow in the other direction so, 2 ends of filter inductance L still induce positive voltage, 1 end induces negative voltage, 3 ends of the afterflow metal-oxide-semiconductor drive coil of filter inductance L still induce negative voltage, and 4 ends of the afterflow metal-oxide-semiconductor drive coil of filter inductance L induce positive voltage, and the grid of afterflow metal-oxide-semiconductor M2 bears forward voltage, still conducting of afterflow metal-oxide-semiconductor M2 is for the reverse afterflow of inductance provides path.
In sum, the drive signal of main as can be known power MOS pipe M1 and afterflow metal-oxide-semiconductor M2 is opposite, as shown in Figure 6, could guarantee the circuit operate as normal like this.But such situation may occur, when afterflow metal-oxide-semiconductor M2 afterflow conducting, 1 end of filter inductance L is a negative voltage, and 2 ends are positive voltage.If control the unexpected conducting of main power MOS pipe M1, at this moment 1 end of filter inductance L is not also sensed positive voltage rapidly, can't turn off afterflow metal-oxide-semiconductor M2 at once, thereby causes main power MOS pipe M1, afterflow metal-oxide-semiconductor M2 conducting simultaneously, causes the input port short circuit.
For fear of this phenomenon, need be in the inductance L of a small inductor value of the drain electrode of afterflow metal-oxide-semiconductor M2 series connection
Add, pass through inductance L
AddMoment of electric current is hindered, power MOS pipe M1 of winner and afterflow metal-oxide-semiconductor M2 can not led directly at once,, thereby guarantee afterflow metal-oxide-semiconductor M2 reliable turn-off for the variation of filter inductance L induced voltage sets apart.
A kind of self-driven synchronous buck converter circuit provided by the invention is compared with the conventional synchronization step-down controller circuit, has the advantage that circuit structure is simple, efficient is high, cost is low.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (5)
1. self-driven synchronous buck converter circuit, it is characterized in that: comprise the input port that is used to receive input voltage, main power MOS pipe M1, afterflow metal-oxide-semiconductor M2, drive the flash chip for driving of described main power MOS pipe M1, filter capacitor C and filter inductance L, wherein, described filter inductance L comprises two groups of coils, wherein one group of coil is for having 1, the topological output inductor coil of the master of 2 ends, another group coil is for having 3, the afterflow metal-oxide-semiconductor drive coil of 4 ends, topological output inductor coil of described master and described afterflow metal-oxide-semiconductor drive coil intercouple, 1 of described filter inductance L, 3 ends are end of the same name, the drain electrode of described main power MOS pipe M1 is connected with described input port, the source electrode of described main power MOS pipe M1 is connected with 1 end of described filter inductance L, 2 ends of described filter inductance L are connected with the end of described filter capacitor C, the other end ground connection of described filter capacitor C, the drain electrode of described afterflow metal-oxide-semiconductor M2 is connected with 1 end of described filter inductance L, the source ground of described afterflow metal-oxide-semiconductor M2, the source electrode of described afterflow metal-oxide-semiconductor M2 is connected with 3 ends of described filter inductance L, and the grid of described afterflow metal-oxide-semiconductor M2 is connected with 4 ends of described filter inductance L.
2. self-driven synchronous buck converter circuit according to claim 1 is characterized in that: be in series with inductance L between the source electrode of described afterflow metal-oxide-semiconductor M2 and 3 ends of described filter inductance L
Add, described inductance L
AddBe used to avoid described main power MOS pipe M1, afterflow metal-oxide-semiconductor M2 moment conducting.
3. self-driven synchronous buck converter circuit according to claim 2 is characterized in that: described inductance L
AddAn end be connected with the source electrode of described afterflow metal-oxide-semiconductor M2, the other end is connected with the intersection point of 1 end of described filter inductance L with described main power MOS pipe M1.
4. self-driven synchronous buck converter circuit according to claim 1 is characterized in that: described filter capacitor C is parallel with load resistance R.
5. self-driven synchronous buck converter circuit according to claim 1, it is characterized in that: the TG end of described flash chip for driving is connected with the grid of described main power MOS pipe M1, and the TS end of described flash chip for driving is connected with the source electrode of described main power MOS pipe M1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101732179A CN102223069A (en) | 2011-06-25 | 2011-06-25 | Self-driven synchronous buck converter circuit |
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| CN2011101732179A CN102223069A (en) | 2011-06-25 | 2011-06-25 | Self-driven synchronous buck converter circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915063A (en) * | 2016-05-18 | 2016-08-31 | 南京理工大学 | Synchronous step-down topological circuit with isolated output |
| CN106505862A (en) * | 2016-10-18 | 2017-03-15 | 上海希形科技有限公司 | The insulating power supply of few element |
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| US6188592B1 (en) * | 1999-11-05 | 2001-02-13 | Ericsson Inc. | Externally-driven scheme for synchronous rectification |
| CN1545196A (en) * | 2003-11-21 | 2004-11-10 | 华南理工大学 | Voltage self-driving synchronous rectification circuit |
| US6839246B1 (en) * | 1999-12-27 | 2005-01-04 | Emerson Network Power Co., Ltd. | Self-driving circuit for a DC/DC converter |
| US20070076457A1 (en) * | 2005-09-16 | 2007-04-05 | Hon Hai Precision Industry Co., Ltd. | Self-driven synchronous rectification and voltage stabilization circuit |
| CN101141095A (en) * | 2006-09-06 | 2008-03-12 | 台达电子工业股份有限公司 | Synchronous commutation consequent converter with reverse current suppresser |
| CN201349180Y (en) * | 2009-01-20 | 2009-11-18 | 深圳市振华微电子有限公司 | Synchronous rectifier driving circuit |
| CN101888189A (en) * | 2010-01-29 | 2010-11-17 | 华为技术有限公司 | Synchronous rectification circuit |
| JP2011030310A (en) * | 2009-07-22 | 2011-02-10 | Toshiba Lighting & Technology Corp | Power supply device and luminaire |
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2011
- 2011-06-25 CN CN2011101732179A patent/CN102223069A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6188592B1 (en) * | 1999-11-05 | 2001-02-13 | Ericsson Inc. | Externally-driven scheme for synchronous rectification |
| US6839246B1 (en) * | 1999-12-27 | 2005-01-04 | Emerson Network Power Co., Ltd. | Self-driving circuit for a DC/DC converter |
| CN1545196A (en) * | 2003-11-21 | 2004-11-10 | 华南理工大学 | Voltage self-driving synchronous rectification circuit |
| US20070076457A1 (en) * | 2005-09-16 | 2007-04-05 | Hon Hai Precision Industry Co., Ltd. | Self-driven synchronous rectification and voltage stabilization circuit |
| CN101141095A (en) * | 2006-09-06 | 2008-03-12 | 台达电子工业股份有限公司 | Synchronous commutation consequent converter with reverse current suppresser |
| CN201349180Y (en) * | 2009-01-20 | 2009-11-18 | 深圳市振华微电子有限公司 | Synchronous rectifier driving circuit |
| JP2011030310A (en) * | 2009-07-22 | 2011-02-10 | Toshiba Lighting & Technology Corp | Power supply device and luminaire |
| CN101888189A (en) * | 2010-01-29 | 2010-11-17 | 华为技术有限公司 | Synchronous rectification circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105915063A (en) * | 2016-05-18 | 2016-08-31 | 南京理工大学 | Synchronous step-down topological circuit with isolated output |
| CN106505862A (en) * | 2016-10-18 | 2017-03-15 | 上海希形科技有限公司 | The insulating power supply of few element |
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Application publication date: 20111019 |