CN101540555A - Power supply and bootstrap circuit thereof - Google Patents
Power supply and bootstrap circuit thereof Download PDFInfo
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- CN101540555A CN101540555A CN200810086870A CN200810086870A CN101540555A CN 101540555 A CN101540555 A CN 101540555A CN 200810086870 A CN200810086870 A CN 200810086870A CN 200810086870 A CN200810086870 A CN 200810086870A CN 101540555 A CN101540555 A CN 101540555A
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Abstract
The invention discloses a power supply and a bootstrap circuit thereof. The bootstrap circuit comprises a transistor, a first capacitor, a first impedance and a voltage stabilizing circuit, wherein a collector and an emitter of the transistor are used as the input end and the output end of the bootstrap circuit respectively; one end of the first capacitor is coupled to the collector of the transistor; one end of the first impedance is coupled to the other end of the first capacitor; and the voltage stabilizing circuit is coupled to the other end of the first impedance and a base of the transistor to clamp the voltage of the base at a preset potential.
Description
Technical field
The invention relates to a kind of power supply unit and boostrap circuit thereof, and particularly reach the only boostrap circuit of consumed power in start-up course relevant for the very little power supply unit of a kind of power consumption.
Background technology
Along with energy crisis is approached gradually, environmental consciousness comes back gradually, and in recent years, U.S. government has proposed 80Plus and Energy Star (Engergy Star) ... etc. energy-conservation standard, in the hope of to the power consumption of electronic product standard to some extent.Above-mentioned these energy conservation criterias have begun to be applied on the computer system, and its restriction computer system power dissipation under standby (standby) situation must be below 3W.Because in computer system, the conversion efficiency of power supply unit (Power Supply) generally has only 60%～70%, cause many electric energy to be transformed into heat energy and be dissipated in the air, and making power supply unit become one of power consumption member main in the computer system, therefore above-mentioned power dissipation restriction has proposed serious challenge for the existing design of power supply unit.
For now,, also have the power loss (Power Loss) of a lot of complementary circuit not propose good solution, it is described with Fig. 1 though power supply unit has adopted quasi-resonance technology and synchronous rectification to raise the efficiency.Fig. 1 is the circuit diagram with power supply unit of traditional boostrap circuit (Bootstrap Circuit).In Fig. 1, resistance 102 and electric capacity 104 have promptly constituted traditional boostrap circuit.The appearance value of the electric capacity 104 of this boostrap circuit must reach greatly, with to pulse-width modulation (Pul se Width Modulation, PWM) control circuit 106 has enough power supplies, and the resistance of resistance 102 also must be enough big, destroys element to avoid surge current (InrushCurrent) by resistance 102.The problem of this power supply unit is, although control circuit for pulse-width modulation 106 only consumes several watts of zero points when driven MOS transistor 108 power, yet after power supply unit started, it is very high-power that resistance 102 still can loss, causes computer system to be difficult to meet aforesaid energy conservation standard.
Summary of the invention
The invention provides a kind of boostrap circuit, it can be applicable in the power supply unit, and this boostrap circuit consumed power in the start-up course of power supply unit only.
The invention provides a kind of power supply unit, its power consumption than the power consumption of conventional power source supply come little.
The present invention proposes a kind of boostrap circuit, and it includes transistor, first electric capacity, first impedance and voltage stabilizing circuit.Transistorized collector electrode and emitter are respectively as the input and the output of boostrap circuit.A wherein end of first electric capacity couples transistorized collector electrode, and a wherein end of first impedance couples the other end of first electric capacity.Voltage stabilizing circuit couples the other end and the transistorized base stage of first impedance, in order to the voltage clamping of aforementioned base in preset potential.
The present invention proposes a kind of power supply unit, and it includes bridge rectifier, first electric capacity, transformer, switch, first diode, second electric capacity, control circuit for pulse-width modulation and boostrap circuit.Bridge rectifier has two ac input ends, a power supply output plus terminal and power supply output negative terminal.A wherein end of first electric capacity couples the power supply output plus terminal, and the other end couples power supply output negative terminal and common electric potential.Transformer has first siding ring and second siding ring, and a wherein end of first siding ring couples the power supply output plus terminal.Switch has first end, second end and control end, and first end of this switch couples the other end of first siding ring, and second end of switch couples common electric potential.The anode of first diode couples a wherein end of second siding ring.A wherein end of second electric capacity couples the negative electrode of first diode, and the other end then couples the other end and the common electric potential of second siding ring.The input of control circuit for pulse-width modulation couples the negative electrode of first diode, and its output then couples the control end of switch.Boostrap circuit is coupled between the input of power supply output plus terminal and control circuit for pulse-width modulation, and when power output end produced supply voltage, this boostrap circuit provided the input of starting resistor to control circuit for pulse-width modulation, and closes voluntarily after the scheduled time.
In one embodiment of this invention, the boostrap circuit in the above-mentioned power supply unit adopts aforesaid boostrap circuit framework.
Boostrap circuit of the present invention is made of a transistor, an electric capacity, an impedance and a voltage stabilizing circuit, and wherein electric capacity and impedance are used for producing a time constant.When the voltage instantaneous of the input of boostrap circuit changed, this electric capacity can see through impedance with transient voltage be coupled to transistorized base stage, with quick turn-on transistor, allows transistorized emitter produce starting resistor; And when boostrap circuit when presenting stable state after the above-mentioned time constant, electric capacity then presents and opens circuit and transistor is ended, and further allows boostrap circuit close voluntarily and consumed power no longer.In addition, power supply unit of the present invention can adopt above-mentioned boostrap circuit framework, because this boostrap circuit is consumed power in the start-up course of power supply unit only, so the power consumption of power supply unit of the present invention under ideal case is less, make its power consumption than the power consumption of conventional power source supply come little.In view of the above, adopt the computer system of power supply unit of the present invention or boostrap circuit, just can easily reach 80Plus and Energy Star (Engergy Star) ... standard etc. energy-conservation standard.
For above-mentioned feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the circuit diagram with power supply unit of traditional boostrap circuit.
Fig. 2 is according to the power supply unit of one embodiment of the invention and the circuit diagram of boostrap circuit thereof.
Embodiment
Fig. 2 is according to the power supply unit of one embodiment of the invention and the circuit diagram of boostrap circuit thereof.This power supply unit includes bridge rectifier (Bridge Rectifier) 202, electric capacity 204, transformer T1, switch 210, diode 212, electric capacity 214, pulse-width modulation (Pulse Width Modulation, PWM) control circuit 216 and boostrap circuit 218.Bridge rectifier 202 has ac input end 202-1 and 202-2, also has power supply output plus terminal 202-3 and power supply output negative terminal 202-4.A wherein end of electric capacity 204 couples power supply output plus terminal 202-3, and the other end couples power supply output negative terminal 202-4 and common electric potential GND.Transformer T1 has first siding ring 206 and second siding ring 208, and a wherein end of first siding ring 206 couples power supply output plus terminal 202-3.Switch 210 has first end, second end and control end, and its first end couples the other end of first siding ring 206, and second end then couples common electric potential GND.
The anode of diode 212 couples a wherein end of second siding ring 208.A wherein end of electric capacity 214 couples the negative electrode of diode 212, and the other end then couples the other end and the common electric potential GND of second siding ring 208.Two ends of this electric capacity 214 are in order to produce the output VOUT of power supply unit.Control circuit for pulse-width modulation 216 has input VDD, output OUT and earth terminal VGND, and input VDD couples the negative electrode of diode 212, and output OUT couples the control end of switch 210.Boostrap circuit 218 is coupled between the input VDD of power supply output plus terminal 202-3 and control circuit for pulse-width modulation 216, when power output end 202-3 produces supply voltage VREC, boostrap circuit 218 provides starting resistor VAUX input VDD to control circuit for pulse-width modulation 216, and closes voluntarily after the scheduled time.
In this example, boostrap circuit 218 includes electric capacity 220, impedance 222 and 224, transistor 226, diode 228 and 230, also includes voltage stabilizing circuit 232.The collector electrode of transistor 226 sees through impedance 224 and couples power supply output plus terminal 202-3, and emitter then couples the input VDD of control circuit for pulse-width modulation 216, and in order to output starting resistor VAUX.A wherein end of electric capacity 220 couples power supply output plus terminal 202-3 and impedance 224, and the other end then sees through impedance 222 and couples voltage stabilizing circuit 232.The anode of diode 230 couples common electric potential GND, and negative electrode then couples impedance 222.The anode of diode 228 couples voltage stabilizing circuit 232, and negative electrode then couples the base stage of transistor 236.Voltage stabilizing circuit 232 couples the anode of impedance 222 and diode 228, in order to the voltage clamping of above-mentioned anode in a preset potential.
Above-mentioned voltage stabilizing circuit 232 includes impedance 234 and 236, also includes shunt regulator (shuntregrlator) 238.A wherein end of impedance 234 couples the anode of impedance 222 and diode 228, and impedance 236 is coupled between the other end and common electric potential GND of impedance 234.Shunt regulator 238 has anode tap, cathode terminal and reference edge, its cathode terminal couples the anode of diode 228, anode tap couples common electric potential GND, reference edge then couples the other end of impedance 234, and shunt regulator 238 determines the voltage swing between its anode tap and the cathode terminal according to the voltage of its reference edge.In the middle of this example, switch 210 can be used metal-oxide semiconductor transistor (Metal Oxide Semiconductor Transistor, MOS Transistor) realizes, impedance 222,224,234 and 236 can realize that transistor 226 then is to realize with power npn transistor (PowerTransistor) with resistance.
When ac input end 202-1, the 202-2 of bridge rectifier 202 receive AC power AC, just can begin to carry out the work of changeing direct current that exchanges, to see through power supply output plus terminal 202-3 and power supply output negative terminal 202-4 output ripple direct current, the polarity of this DC power supply has been shown among the figure, + just representing that-expression is negative.At this moment, because the voltage VREC instantaneous variation of power supply output plus terminal 202-3, make electric capacity 220 voltage can be coupled to impedance 222 couple the place mutually, conduct high voltage is to the base stage of transistor 226 to see through impedance 222 and diode 228 more in regular turn, further allows transistor 226 conducting apace.Thus, transistor 226 just can produce starting resistor VAUX at its emitter soon, and export the input VDD of control circuit for pulse-width modulation 216 to, allow control circuit for pulse-width modulation 216 start working and switch 210 is driven, and then make transformer T1 begin operation.
After transformer T1 begins operation, just can see through diode 212 and transmit the required power supply of control circuit for pulse-width modulation 216, and keep the stable of this power supply with electric capacity 214.As for boostrap circuit 218, because its electric capacity 220 and impedance 222 are to be used for setting a time constant, operate time of boostrap circuit 218 just, when therefore presenting stable state when 220 charging a period of times of electric capacity, electric capacity 220 just opens circuit (open) and transistor 226 is ended, and further allows boostrap circuit 218 close voluntarily and consumed power no longer.That is to say that when power supply unit started, boostrap circuit 218 was responsible for allowing transformer T1 begin action, and begin to move and after producing the required power supply of control circuit for pulse-width modulation 216, boostrap circuit 218 is just closed voluntarily at transformer T1.Hence one can see that, boostrap circuit 218 only can be in the start-up course of power supply unit consumed power, make that the power consumption of power supply unit under ideal case is less, so allow its power consumption than the power consumption of conventional power source supply come little.
In addition; in above-mentioned boostrap circuit 218; voltage stabilizing circuit 232 is except can be with the voltage clamping of the anode of diode 228 in a preset potential; be not subjected to protective transistor 226 outside the big voltage destruction of moment; the user also can see through adjust impedance 234 and 236 the two ratios, with the value of decision starting resistor VAUX.In addition, diode 230 is can not produce negative voltage in order to protect on other element, and impedance 224 then is in order to as current-limiting resistance so that transistor 226 operate in the safety operation zone (Save Operation Area, SOA) in.In this boostrap circuit 218, impedance 224, diode 228 and 230 are all inessential member, and the user also can determine whether adopt according to the actual needs in the design.
In sum, boostrap circuit of the present invention is made of a transistor, an electric capacity, an impedance and a voltage stabilizing circuit, and wherein electric capacity and impedance are used for producing a time constant.When the voltage instantaneous of the input of boostrap circuit changed, this electric capacity can see through impedance with transient voltage be coupled to transistorized base stage, with quick turn-on transistor, allows transistorized emitter produce starting resistor; And when boostrap circuit when presenting stable state after the above-mentioned time constant, electric capacity then presents and opens circuit and transistor is ended, and further allows boostrap circuit close voluntarily and consumed power no longer.In addition, power supply unit of the present invention can adopt above-mentioned boostrap circuit framework, because this boostrap circuit is consumed power in the start-up course of power supply unit only, so the power consumption of power supply unit of the present invention under ideal case is less, make its power consumption than the power consumption of conventional power source supply come little.In view of the above, adopt the computer system of power supply unit of the present invention or boostrap circuit, just can easily reach 80Plus and Energy Star (Engergy Star) ... standard etc. energy-conservation standard.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is when with being as the criterion that claim was defined.
Claims (11)
1. boostrap circuit comprises:
One transistor, its collector electrode and emitter are respectively as the input and the output of this boostrap circuit;
One first electric capacity, one end couple this transistorized collector electrode;
One first impedance, the one end couples the other end of this first electric capacity; And
One voltage stabilizing circuit couples the other end of this first impedance and this transistorized base stage, in order to the voltage clamping of aforementioned base in a preset potential.
2. boostrap circuit as claimed in claim 1 is characterized in that, this voltage stabilizing circuit comprises:
One second impedance, one end couple the other end and this transistorized base stage of this first impedance;
One the 3rd impedance is coupled between the other end and a common electric potential of this second impedance; And
One shunt regulator, have anode tap, cathode terminal and reference edge, its cathode terminal couples this transistorized base stage, anode tap couples this common electric potential, reference edge then couples the other end of this second impedance, and this shunt regulator determines the voltage swing between its anode tap and the cathode terminal according to the voltage of its reference edge.
3. boostrap circuit as claimed in claim 1, it is characterized in that, also comprise one second impedance, this second impedance coupling between this transistorized collector electrode and this first electric capacity, and this second impedance and this first electric capacity couple the input of place mutually as this boostrap circuit.
4. boostrap circuit as claimed in claim 1 is characterized in that, also comprises one first diode, and the anode of this first diode couples this common electric potential, and negative electrode then couples the other end of this first impedance.
5. boostrap circuit as claimed in claim 1 is characterized in that, more comprises one first diode, and the anode of this first diode couples this voltage stabilizing circuit, and the negative electrode of this first diode then couples this transistorized base stage.
6. power supply unit comprises:
One bridge rectifier has two ac input ends, a power supply output plus terminal and power supply output negative terminal;
One first electric capacity, one end couple this power supply output plus terminal, and the other end couples this a power supply output negative terminal and common electric potential;
One transformer has one lateral coils and a second siding ring, and a wherein end of this first siding ring couples this power supply output plus terminal;
One switch has first end, second end and control end, and first end of this switch couples the other end of this first siding ring, and second end of this switch couples this common electric potential;
One first diode, its anode couple a wherein end of this second siding ring;
One second electric capacity, the one end couples the negative electrode of this first diode, and the other end couples the other end and this common electric potential of this second siding ring;
One control circuit for pulse-width modulation, its input couples the negative electrode of this first diode, and its output couples the control end of this switch; And
One boostrap circuit, be coupled between the input of this power supply output plus terminal and this control circuit for pulse-width modulation, when this power output end produced a supply voltage, this boostrap circuit provided the input of a starting resistor to this control circuit for pulse-width modulation, and closed voluntarily after a scheduled time.
7. power supply unit as claimed in claim 6 is characterized in that, this boostrap circuit comprises:
One transistor, its collector electrode couple this power supply output plus terminal, and emitter then couples the input of this control circuit for pulse-width modulation, and in order to export this starting resistor;
One the 3rd electric capacity, one end couple this transistorized collector electrode;
One first impedance, the one end couples the other end of the 3rd electric capacity; And
One voltage stabilizing circuit, the other end that couples this first impedance and this transistorized base stage, in order to the voltage clamping of aforementioned base in a preset potential.
8. power supply unit as claimed in claim 7 is characterized in that, this voltage stabilizing circuit comprises:
One second impedance, one end couple the other end and this transistorized base stage of this first impedance;
One the 3rd impedance is coupled between the other end and this common electric potential of this second impedance; And
One shunt regulator, have anode tap, cathode terminal and reference edge, its cathode terminal couples this transistorized base stage, anode tap couples this common electric potential, reference edge then couples the other end of this second impedance, and this shunt regulator determines the voltage swing between its anode tap and the cathode terminal according to the voltage of its reference edge.
9. power supply unit as claimed in claim 7 is characterized in that, this boostrap circuit also comprises one second impedance, and this second impedance coupling is between this transistorized collector electrode and this power supply output plus terminal.
10. power supply unit as claimed in claim 7 is characterized in that, this boostrap circuit also comprises one second diode, and the anode of this second diode couples this common electric potential, and negative electrode then couples the other end of this first impedance.
11. power supply unit as claimed in claim 7 is characterized in that, this boostrap circuit also comprises one second diode, and the anode of this second diode couples this voltage stabilizing circuit, and the negative electrode of this second diode then couples this transistorized base stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810086870A CN101540555A (en) | 2008-03-17 | 2008-03-17 | Power supply and bootstrap circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810086870A CN101540555A (en) | 2008-03-17 | 2008-03-17 | Power supply and bootstrap circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101540555A true CN101540555A (en) | 2009-09-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810086870A Pending CN101540555A (en) | 2008-03-17 | 2008-03-17 | Power supply and bootstrap circuit thereof |
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| CN (1) | CN101540555A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219872A (en) * | 2012-01-19 | 2013-07-24 | 尼克森微电子股份有限公司 | Converting control circuit and converter thereof |
| CN112000164A (en) * | 2019-05-27 | 2020-11-27 | 宏碁股份有限公司 | Power supply |
-
2008
- 2008-03-17 CN CN200810086870A patent/CN101540555A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219872A (en) * | 2012-01-19 | 2013-07-24 | 尼克森微电子股份有限公司 | Converting control circuit and converter thereof |
| US9078319B2 (en) | 2012-01-19 | 2015-07-07 | Niko Semiconductor Co., Ltd. | Conversion control circuit and converter thereof |
| CN112000164A (en) * | 2019-05-27 | 2020-11-27 | 宏碁股份有限公司 | Power supply |
| CN112000164B (en) * | 2019-05-27 | 2022-04-05 | 宏碁股份有限公司 | Power supply |
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Open date: 20090923 |