CN102340254A - Buck power converter - Google Patents
Buck power converter Download PDFInfo
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- CN102340254A CN102340254A CN2010102334437A CN201010233443A CN102340254A CN 102340254 A CN102340254 A CN 102340254A CN 2010102334437 A CN2010102334437 A CN 2010102334437A CN 201010233443 A CN201010233443 A CN 201010233443A CN 102340254 A CN102340254 A CN 102340254A
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Abstract
The invention provides a buck power converter, which is used for converting a power input voltage into a power output voltage. The buck power converter comprises a first rectifier filter circuit and a power integrated circuit. The first rectifier filter circuit is used for carrying out rectification and filtering on an output intermediate voltage and converting the output intermediate voltage into a power output voltage; and the power integrated circuit is used for converting the power output voltage into the output intermediate voltage. Besides, the power integrated circuit comprises a voltage output pin and a second rectifier filter circuit. The voltage output pin is used for outputting the output intermediate voltage; and the second rectifier filter circuit, which is coupled with the voltage output pin, is used for carrying out rectification and filtering on the output intermediate voltage so as to convert the output intermediate voltage into a detection voltage, wherein the detection voltage is the same as the power output voltage.
Description
Technical field
The invention relates to a kind of power transformation circuit, and particularly about a kind of voltage-dropping type power supply changeover device.
Background technology
Along with science and technology is flourish, various electronic product occurs to satisfy daily life required successively, such as computer, TV, mobile phone ... Deng electronic product, and the aforementioned electronic product all need use low-voltage and galvanic current source.General obtainable power source is high voltage AC power or the battery DC power supply that Utilities Electric Co. provided; No matter be high voltage AC power or battery DC power supply; All need to convert thereof into low-voltage and galvanic current source, for the power source of aforementioned electronic product as its normal operation via power supply changeover device.
Therefore; Nearly all electronic product all needs the galvanic current source converter to obtain low-voltage and galvanic current source; And the voltage-dropping type power supply changeover device is simple in structure because of it, cost is low, energy conversion efficiency is high and superior function such as high-reliability, so extensively adopted the power supply changeover device as electronic product.
For letting the user when operating, comply with the electric power output voltage of its required adjustment voltage-dropping type power supply changeover device; In general can use feedback resistance; Will export conversion of signals is feedback voltage; And then feedback to power integrated circuit, and utilize power integrated circuit that feedback voltage is controlled at the predeterminated voltage value, with the adjustment electric power output voltage.But feedback resistance is to be disposed voluntarily by the user; So power integrated circuit can't effectively utilize the mechanism of back coupling and remove the actual electric power output voltage of perception; Therefore in some utilization; If need to use the practical power output voltage to do computing, then need extraly in power integrated circuit, make a pin position and remove to detect electric power output voltage.
In sum, will cause the complicated of power integrated circuit, and influence the flexibility ratio of power integrated circuit utilization.In addition, if in power integrated circuit, make extra pin position, also can increase cost of manufacture.
Summary of the invention
For solving the problem of known technology; Main purpose of the present invention is to provide a kind of voltage-dropping type power supply changeover device; Utilize the existing pin of power integrated circuit in the voltage-dropping type power supply changeover device; And be built in the current rectifying and wave filtering circuit in the power integrated circuit in cooperating, with the magnitude of voltage of detecting electric power output voltage.
For reaching above-mentioned purpose, the present invention provides a kind of voltage-dropping type power supply changeover device.According to an embodiment of the present invention, the voltage-dropping type power supply changeover device is in order to convert power input voltage into electric power output voltage, and it comprises first current rectifying and wave filtering circuit and power integrated circuit.First current rectifying and wave filtering circuit will be exported intermediate voltage and convert electric power output voltage in order to the output intermediate voltage is carried out rectification and filtering.Power integrated circuit is in order to convert power input voltage into the output intermediate voltage, and it comprises the voltage output connecting pin and second current rectifying and wave filtering circuit.The voltage output connecting pin is in order to export aforementioned output intermediate voltage.Second current rectifying and wave filtering circuit is coupled to the voltage output connecting pin, and aforementioned second current rectifying and wave filtering circuit is in order to intermediate voltage carries out rectification and filtering converts detecting voltage into will export intermediate voltage to exporting, and it is identical with electric power output voltage wherein to detect voltage.Power integrated circuit is to utilize detecting voltage to carry out computing.
Therefore, according to the embodiment of the present invention, the embodiment of the invention is built in current rectifying and wave filtering circuit in the power integrated circuit with the magnitude of voltage of detecting electric power output voltage through the existing pin of power integrated circuit and in cooperating.So, can under the situation that does not increase the power integrated circuit pin, detect the magnitude of voltage of electric power output voltage, thus the flexibility ratio of bring to power integrated circuit utilization.
Description of drawings
For letting above and other objects of the present invention, characteristic, advantage and the embodiment can be more obviously understandable, the explanation of appended accompanying drawing be following:
Fig. 1 is the circuit diagram that illustrates according to a kind of voltage-dropping type power supply changeover device of an embodiment of the present invention;
Fig. 2 A illustrates the sketch map according to second current rectifying and wave filtering circuit a kind of as shown in fig. 1 of first embodiment of the invention;
Fig. 2 B is the sketch map that illustrates according to second current rectifying and wave filtering circuit a kind of as shown in fig. 1 of second embodiment of the invention;
Fig. 2 C is the sketch map that illustrates according to second current rectifying and wave filtering circuit a kind of as shown in fig. 1 of third embodiment of the invention;
Fig. 3 illustrates voltage-dropping type power supply changeover device as shown in Figure 1 wherein to export intermediate voltage V
LX, electric power output voltage V
OUTWith detecting voltage V
OUT2Volt-time curve figure.
[primary clustering symbol description]
100: 132: the second current rectifying and wave filtering circuits of voltage-dropping type power supply changeover device
110: power input 134: control unit
140: the first power switchs of 120: the first current rectifying and wave filtering circuits
122: 150: the second power switchs of input
124: 160: the first feedback resistances of output
126: 170: the second feedback resistances of inductance
128: electric capacity 180: power output end
130: power integrated circuit 212: input
216: electric capacity 214: output
218: resistance 231: input
221: input 232: output
222: 233: the first resistance of output
234: the second resistance of 223: the first resistance
235: the three resistance of 224: the second resistance
225: electric capacity 236: electric capacity
Embodiment
Fig. 1 is the circuit diagram that illustrates a kind of voltage-dropping type power supply changeover device 100 according to an embodiment of the present invention.According to one embodiment of the invention, voltage-dropping type power supply changeover device 100 is in order to power input voltage V
INConvert electric power output voltage V into
OUT, it comprises first current rectifying and wave filtering circuit 120 and power integrated circuit 130.First current rectifying and wave filtering circuit 120 is in order to output intermediate voltage V
LXCarry out rectification and filtering, will export intermediate voltage V
LXConvert electric power output voltage V into
OUT
In addition, power integrated circuit 130 is in order to power input voltage V
INConvert output intermediate voltage V into
LX, it comprises the voltage output connecting pin LX and second current rectifying and wave filtering circuit 132.Voltage output connecting pin LX is in order to export aforementioned output intermediate voltage V
LXSecond current rectifying and wave filtering circuit 132 is coupled to voltage output connecting pin LX, and second current rectifying and wave filtering circuit 132 is in order to output intermediate voltage V
LXCarry out rectification and filtering, will export intermediate voltage V
LXConvert detecting voltage V into
OUT2, wherein detect voltage V
OUT2With electric power output voltage V
OUTIdentical.In addition, power integrated circuit 130 detecting voltage V capable of using
OUT2Carry out computing.
In the present embodiment, power input voltage V
INCan change it and must export intermediate voltage V via power integrated circuit 130
LXSubsequently, output intermediate voltage V
LXVia first current rectifying and wave filtering circuit 120 it is carried out rectification and filtering again, thereby produce electric power output voltage V
OUTSo, voltage-dropping type power supply changeover device 100 can be with power input voltage V
INConvert electric power output voltage V into
OUT
In the present embodiment, electric power output voltage V
OUTBe 120 pairs of output of first current rectifying and wave filtering circuit intermediate voltage V
LXCarry out gained person after rectification and the filtering.Therefore, if in power integrated circuit 130, in build second current rectifying and wave filtering circuit 132 that is equivalent to first current rectifying and wave filtering circuit 120, then second current rectifying and wave filtering circuit 132 can be to middle voltage V
LXCarry out rectification and filtering, and obtain being equal to electric power output voltage V
OUTDetecting voltage V
OUT2So, can under the situation that does not increase power integrated circuit 130 pins, utilize existing pin (being voltage output connecting pin LX) with detecting electric power output voltage V
OUTMagnitude of voltage.
First current rectifying and wave filtering circuit 120 of present embodiment comprises input 122, output 124, inductance 126 and electric capacity 128.Input 122 is coupled to voltage output connecting pin LX.Inductance 126 has first end and second end, and wherein first end of inductance 126 is coupled to input 122, and second end of inductance 126 is coupled to output 124.Electric capacity 128 has first end and second end, and wherein first end of electric capacity 128 is coupled between second end and output 124 of inductance 126, and second end of electric capacity 128 is coupled to earth terminal GND.
In the present embodiment, voltage-dropping type power supply changeover device 100 also can comprise first power switch 140 and second power switch 150.First power switch 140 comprises control end, first end and second end.The control end of first power switch 140 is coupled to power integrated circuit 130, is controlled to carry out the switching of switch by power integrated circuit 130; First end of first power switch 140 is coupled to power input 110, in order to receive power input voltage VIN; Second end of first power switch 140 is coupled to first current rectifying and wave filtering circuit 120 (like first end of inductance 126 wherein).In addition, second power switch 150 comprises control end, first end and second end.The control end of second power switch 150 is coupled to power integrated circuit 130, is controlled to carry out the switching of switch by power integrated circuit 130; First end of second power switch 150 is coupled to first current rectifying and wave filtering circuit 120 (like first end of inductance 126 wherein); Second end of second power switch 150 is coupled to earth terminal GND.Above-mentioned first power switch 140 and second power switch 150 can be according to actual demand or modes of operation, optionally realize with P type or N transistor npn npn or other assembly that can be used as switch, do not limit at this.
In the present embodiment, the control end of first power switch 140 more can be in order to receiving first drive signal carrying out the switching of switch, and the control end of second power switch 150 more can be in order to receive second drive signal to carry out the switching of switch.In addition, in the present embodiment, power integrated circuit 130 also can comprise first and drive the pin DRVH and the second driving pin DRVL, wherein first drives pin DRVH in order to export first drive signal, and second drives pin DRVL in order to export second drive signal.
Following operating process with exemplary ground explanation voltage-dropping type power supply changeover device 100.At first, power integrated circuit 130 is closed with 140 conductings of first power switch and with second power switch 150, and this moment is according to power input voltage V
INThe electric current that is produced can flow to second end by first end of first power switch 140, and provides aforementioned currents to inductance 126, makes inductance 126 carry out storage power and energy-delivering action.Then, power integrated circuit 130 is closed first power switch 140 and with 150 conductings of second power switch, is stopped to provide electric current to inductance 126 at this moment, thereby discharged by 126 pairs of electric capacity 128 of inductance and load (not shown).Therefore, see through unlatching and shut-in time that first power switch 140 and second power switch 150 are switched in control, power integrated circuit 130 controllable power output voltage V
OUT
In the present embodiment, voltage-dropping type power supply changeover device 100 also can comprise first feedback resistance 160 and second feedback resistance 170.First feedback resistance 160 has first end and second end, and wherein first end of first feedback resistance 160 is coupled to power output end 180.Second feedback resistance 170 has first end and second end; Wherein first end of second feedback resistance 170 is coupled to second end of first feedback resistance 160; And second end of second feedback resistance 170 is coupled to earth terminal GND, and second end of first feedback resistance 160 produces corresponding to electric power output voltage V
OUTFeedback voltage V
FB
In addition, power integrated circuit 130 also comprises back coupling pin FB, feedbacks pin FB in order to receive feedback voltage V
FB, follow 130 couples of feedback voltage V of power integrated circuit
FBCarry out computing, and can be through the control unit 134 in the power integrated circuit 130 according to feedback voltage V
FB Power controlling switch 140 and 150 makes power switch 140 and 150 do corresponding unlatching and cut out, with adjustment output intermediate voltage V
LX, and then adjustment control electric power output voltage V
OUT
On the other hand, in the present embodiment, second current rectifying and wave filtering circuit 132 can be resistor capacitor circuit, and aforementioned resistor capacitor circuit is coupled to voltage output connecting pin LX.Fig. 2 A is the sketch map that illustrates a kind of second current rectifying and wave filtering circuit as shown in fig. 1 according to first embodiment of the invention.Second current rectifying and wave filtering circuit comprises input 212, output 214, electric capacity 216 and resistance 218.Input 212 is coupled to the voltage output connecting pin.One end of electric capacity 216 is coupled to output 214.One end of resistance 218 is coupled to input 212, and the other end of resistance 218 is coupled between output 214 and the electric capacity 216.
Shown in 2A figure, if the part that the circuit center is got up is defined as a unit, then visual circuit requirements series connection N unit.When for example connecting Unit two, promptly constitute second order resistance capacitance filter circuit, and when connecting Unit three, promptly constitute three rank resistance capacitance filter circuits, by that analogy.Then, again the other end of the resistance of last unit is coupled to output 214.
Fig. 2 B is the sketch map that illustrates a kind of second current rectifying and wave filtering circuit as shown in fig. 1 according to second embodiment of the invention.Second current rectifying and wave filtering circuit comprises input 221, output 222, first resistance 223, second resistance 224 and electric capacity 225.Input 221 is coupled to the voltage output connecting pin.First resistance 223 has first end and second end, and wherein first end of first resistance 223 is coupled to input 221.Second resistance 224 has first end and second end, and wherein first end of second resistance 224 is coupled to second end of first resistance 223, and second end of second resistance 224 is coupled to output 222.One end of electric capacity 225 is coupled between first resistance 223 and second resistance 224.
Shown in Fig. 2 B, if the part that the circuit center is got up is defined as a unit, then visual circuit requirements series connection N unit.When for example connecting Unit two, promptly constitute second order resistance capacitance filter circuit, and when connecting Unit three, promptly constitute three rank resistance capacitance filter circuits, by that analogy.Then, again second end of the resistance of last unit is coupled to first end of second resistance 224.
Fig. 2 C is the sketch map that illustrates a kind of second current rectifying and wave filtering circuit as shown in fig. 1 according to third embodiment of the invention.Second current rectifying and wave filtering circuit comprises input 231, output 232, first resistance 233, second resistance 234, the 3rd resistance 235 and electric capacity 236.Input 231 is coupled to the voltage output connecting pin.First resistance 233 has first end and second end, and wherein first end of first resistance 233 is coupled to input 231.The 3rd resistance 235 has first end and second end, and wherein first end of the 3rd resistance 235 is coupled to second end of first resistance 233, and second end of the 3rd resistance 235 is coupled to output 232.Second resistance 234 has first end and second end, and wherein first end of second resistance 234 is coupled between first resistance 233 and the 3rd resistance 235.One end of electric capacity 236 is coupled to second end of second resistance 234.
Shown in Fig. 2 C, if the part that the circuit center is got up is defined as a unit, then visual circuit requirements series connection N unit.When for example connecting Unit two; First end of first resistance of first module still is coupled to input 231; Then; First end of first resistance of Unit second is coupled to second end of first resistance of first module, and second end of first resistance of Unit second then is coupled to first end of the 3rd resistance 235.
Fig. 3 illustrates voltage-dropping type power supply changeover device 100 as shown in Figure 1 wherein to export intermediate voltage V
LX, electric power output voltage V
OUTWith detecting voltage V
OUT2Volt-time curve figure.As shown in Figure 3, when voltage-dropping type power supply changeover device 100 reaches stable state, electric power output voltage V
OUTWith detecting voltage V
OUT2Can the convergence unanimity.Can know that by The above results the embodiment of the invention is come respectively to output intermediate voltage V through using first filter circuit 120 and second filter circuit 132 of equivalence
LXCarry out rectification and filtering, can obtain identical electric power output voltage V really
OUTWith detecting voltage V
OUT2Therefore, the voltage-dropping type power supply changeover device 100 power integrated circuit 130 existing pins capable of using (being voltage output connecting pin LX) of the embodiment of the invention are with detecting electric power output voltage V
OUTMagnitude of voltage, and do not need the pin of extra increase power integrated circuit 130.
Can know by the above-mentioned execution mode of the present invention, use the present invention and have advantage.The voltage-dropping type power supply changeover device of the embodiment of the invention can use the existing pin of its power integrated circuit (for example: the voltage output connecting pin), and be built in the current rectifying and wave filtering circuit in the power integrated circuit in cooperating, with the magnitude of voltage of detecting electric power output voltage.So, can under the situation that does not increase the power integrated circuit pin, detect the magnitude of voltage of electric power output voltage, thus the flexibility ratio of bring to power integrated circuit utilization.
Though the present invention discloses as above with execution mode; Right its is not in order to limit the present invention; Anyly be familiar with this art; Do not breaking away from the spirit and scope of the present invention, when can doing various changes and retouching, so protection scope of the present invention is as the criterion when looking the scope that appending claims defines.
Claims (10)
1. a voltage-dropping type power supply changeover device is characterized in that, in order to convert a power input voltage into an electric power output voltage, comprises:
One first current rectifying and wave filtering circuit in order to an output intermediate voltage is carried out rectification and filtering, should be exported intermediate voltage and convert this electric power output voltage into; And
One power integrated circuit in order to this power input voltage is converted into this output intermediate voltage, comprises:
One voltage output connecting pin should be exported intermediate voltage in order to output; And
One second current rectifying and wave filtering circuit; Be coupled to this voltage output connecting pin; This second current rectifying and wave filtering circuit converted a detecting voltage in order to this output intermediate voltage is carried out rectification and filtering into should export intermediate voltage, and it is identical with this electric power output voltage wherein should to detect voltage.
2. voltage-dropping type power supply changeover device according to claim 1 is characterized in that, this first current rectifying and wave filtering circuit comprises:
One input is coupled to this voltage output connecting pin;
One output;
One inductance has one first end and one second end, and wherein this first end of this inductance is coupled to this input, and this second end of this inductance is coupled to this output; And
One electric capacity has one first end and one second end, and wherein this first end of this electric capacity is coupled between this second end and this output of this inductance, and this second end of this electric capacity is coupled to an earth terminal.
3. voltage-dropping type power supply changeover device according to claim 1 is characterized in that, this second current rectifying and wave filtering circuit is a resistor capacitor circuit.
4. voltage-dropping type power supply changeover device according to claim 1 is characterized in that, this second current rectifying and wave filtering circuit comprises:
One input is coupled to this voltage output connecting pin;
One output;
One electric capacity, an end of this electric capacity is coupled to this output; And
One resistance, an end of this resistance is coupled to this input, and the other end of this resistance is coupled between this output and this electric capacity.
5. voltage-dropping type power supply changeover device according to claim 1 is characterized in that, this second current rectifying and wave filtering circuit comprises:
One input is coupled to this voltage output connecting pin;
One output;
One first resistance has one first end and one second end, and wherein this first end of this first resistance is coupled to this input;
One second resistance has one first end and one second end, and wherein this first end of this second resistance is coupled to this second end of this first resistance, and this second end of this second resistance is coupled to this output; And
One electric capacity, one of which end are coupled between this first resistance and this second resistance.
6. voltage-dropping type power supply changeover device according to claim 1 is characterized in that, this second current rectifying and wave filtering circuit comprises:
One input is coupled to this voltage output connecting pin;
One output;
One first resistance has one first end and one second end, and wherein this first end of this first resistance is coupled to this input;
One second resistance has one first end and one second end, and wherein this first end of this second resistance is coupled to this second end of this first resistance, and this second end of this second resistance is coupled to this output;
One the 3rd resistance has one first end and one second end, and wherein this first end of the 3rd resistance is coupled between this first resistance and this second resistance; And
One electric capacity, one of which end are coupled to this second end of the 3rd resistance.
7. voltage-dropping type power supply changeover device according to claim 1 is characterized in that, also comprises:
One first power switch comprises:
One control end is coupled to this power integrated circuit, is controlled to carry out the switching of switch by this power integrated circuit;
One first end is coupled to a power input, in order to receive this power input voltage; And
One second end is coupled to this first current rectifying and wave filtering circuit; And
One second power switch comprises:
One control end is coupled to this power integrated circuit, is controlled to carry out the switching of switch by this power integrated circuit;
One first end is coupled to this first current rectifying and wave filtering circuit; And
One second end is coupled to an earth terminal.
8. voltage-dropping type power supply changeover device according to claim 2 is characterized in that, also comprises:
One first power switch comprises:
One control end is in order to receive one first drive signal, to carry out the switching of switch;
One first end is coupled to a power input, in order to receive this power input voltage; And
One second end is coupled to this first end of this inductance; And
One second power switch comprises:
One control end is in order to receive one second drive signal, to carry out the switching of switch;
One first end is coupled to this first end of this inductance; And
One second end is coupled to this earth terminal;
Wherein this power integrated circuit also comprises:
One first drives pin, in order to export this first drive signal; And
One second drives pin, in order to export this second drive signal.
9. voltage-dropping type power supply changeover device according to claim 1 is characterized in that, also comprises:
One first feedback resistance has one first end and one second end, and wherein this first end of this first feedback resistance is coupled to this power output end; And
One second feedback resistance has one first end and one second end, and wherein this first end of this second feedback resistance is coupled to this second end of this first feedback resistance, and this second end of this second feedback resistance is coupled to an earth terminal;
Wherein this second end in this first feedback resistance produces a feedback voltage corresponding to this electric power output voltage.
10. voltage-dropping type power supply changeover device according to claim 9 is characterized in that, this power integrated circuit also comprises:
One back coupling pin, in order to receive this feedback voltage, this power integrated circuit is controlled at least one power switch according to this feedback voltage, should export intermediate voltage with adjustment, and then adjust this electric power output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102334437A CN102340254A (en) | 2010-07-19 | 2010-07-19 | Buck power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102334437A CN102340254A (en) | 2010-07-19 | 2010-07-19 | Buck power converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102340254A true CN102340254A (en) | 2012-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102334437A Pending CN102340254A (en) | 2010-07-19 | 2010-07-19 | Buck power converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102340254A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10690705B2 (en) | 2016-06-15 | 2020-06-23 | Watlow Electric Manufacturing Company | Power converter for a thermal system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040104714A1 (en) * | 2002-07-24 | 2004-06-03 | Seiko Epson Corporation | Power source circuit |
| US6809560B1 (en) * | 2003-07-11 | 2004-10-26 | Micrel, Inc. | Load sensing circuit for a power MOSFET switch |
| US20050225259A1 (en) * | 2004-04-08 | 2005-10-13 | International Rectifier Corporation | LED buck regulator control IC |
| CN101369808A (en) * | 2007-08-16 | 2009-02-18 | 天钰科技股份有限公司 | Switch adjustment control circuit |
-
2010
- 2010-07-19 CN CN2010102334437A patent/CN102340254A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040104714A1 (en) * | 2002-07-24 | 2004-06-03 | Seiko Epson Corporation | Power source circuit |
| US6809560B1 (en) * | 2003-07-11 | 2004-10-26 | Micrel, Inc. | Load sensing circuit for a power MOSFET switch |
| US20050225259A1 (en) * | 2004-04-08 | 2005-10-13 | International Rectifier Corporation | LED buck regulator control IC |
| CN101369808A (en) * | 2007-08-16 | 2009-02-18 | 天钰科技股份有限公司 | Switch adjustment control circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10690705B2 (en) | 2016-06-15 | 2020-06-23 | Watlow Electric Manufacturing Company | Power converter for a thermal system |
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Application publication date: 20120201 |