CN102570827B - Power system - Google Patents
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- CN102570827B CN102570827B CN201110430207.9A CN201110430207A CN102570827B CN 102570827 B CN102570827 B CN 102570827B CN 201110430207 A CN201110430207 A CN 201110430207A CN 102570827 B CN102570827 B CN 102570827B
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Abstract
The invention relates to a power system, which comprises a transformer, a first rectification unit, a first capacitor, an energy storage unit, a feedback unit and a pulse width modulation unit, wherein the transformer is provided with a first winding and a second winding; the first rectification unit is electrically connected to one end of the second winding; the first capacitor is coupled with the first rectification unit; the energy storage unit is coupled with the secondary side of the transformer, and is provided with a voltage output end for providing voltage for a load; the feedback unit is electrically connected to the output end of the first capacitor, and is used for generating a feedback signal; the pulse width modulation unit is connected in series with the first winding, and is used for controlling the input voltage to flow through the first winding according to the feedback signal, restricting the input voltage to enter the first winding when the voltage output end is under first preset voltage, and making the input voltage enter the first winding to energize a second capacitor according to the feedback signal when the voltage output end is under second preset voltage; and a value of the first preset voltage is greater than that of the second preset voltage. By the power system, power efficiency can be remarkably improved.
Description
Technical field
The present invention is relevant for a kind of power-supply system, espespecially a kind of power-supply system of tool electricity-saving mechanism.
Background technology
Flyback power-supply system (Flyback Power System) is by widely in order to the power supply change-over device as various electronic products.Please refer to Fig. 1, Fig. 1 is the electrical block diagram of known flyback power-supply system 100.Power-supply system 100 has input voltage vin.Transformer 120 comprises armature winding 122, secondary winding 126 and auxiliary winding 124, and wherein armature winding 122 is in order to receive input voltage vin.Current rectifying and wave filtering circuit 150 is used for that the preposition output voltage of secondary winding 126 inductions is carried out to rectifying and wave-filtering and processes, to produce output voltage V o.Output voltage V o can process via the signal of feedback circuit 140, to produce feedback signal Sfb, feedbacks to ON-OFF control circuit 130.ON-OFF control circuit 130 produces and controls signal Sc with the conduction and cut-off state of control switch 132 according to feedback signal Sfb, and then control the electric current of the armature winding 122 of flowing through, therefore,, in the running of flyback power-supply system 100, the conduction and cut-off state switching of switch 132 can cause energy loss.
Summary of the invention
Because the shortcoming of prior art, can be by periodically decapacitation pulse-width modulation unit to reduce energy dissipation when the present invention proposes a kind of power-supply system standby, or when entering power-saving working mode, only provide continuous action load required low burning voltage, so compared to prior art, can significantly improve power-efficient.
For achieving the above object, the invention provides a kind of power-supply system, be applied to electronic installation under power down mode, this power-supply system comprises:
Transformer, this transformer has the first winding and the second winding, and this first winding is arranged at the primary side of this transformer to receive input voltage, and this second winding is arranged at the secondary side of this transformer;
The first rectification unit, is electrically connected on one end of this second winding;
The first electric capacity, is coupled to this first rectification unit;
Energy-storage units, is coupled to the secondary side of this transformer, has voltage output end, in order to provide voltage to load;
Back coupling unit, is electrically connected on the output of this first electric capacity, and produces feedback signal according to the voltage of this first electric capacity output; And
Pulse-width modulation unit, is connected in series with this first winding, according to this feedback signal in order to control this input voltage this first winding of flowing through;
Wherein, when this voltage output end is during in the first predetermined voltage, this pulse-width modulation unit limits this input voltage and enters this first winding; When this voltage output end is during in the second predetermined voltage, this pulse-width modulation unit makes this input voltage enter that this first winding fills according to this feedback signal can this energy-storage units;
Wherein, this first scheduled voltage is greater than this second scheduled voltage.
Preferably, this energy-storage units comprises the second rectification unit and the second electric capacity, and this second rectification unit is electrically connected on one end of this second winding, and this second electric capacity is coupled to this second rectification unit, and this second electric capacity provides voltage to this voltage output end.
Preferably, when this voltage output end is during in the first predetermined voltage, this pulse-width modulation unit limits this input voltage and enters this first winding within first scheduled time, makes this first predetermined voltage drop to this second predetermined voltage.
Preferably, this first scheduled time determines according to the load condition of this second electric capacity and this electronic installation.
Preferably, when this voltage output end is during in the second predetermined voltage, this pulse-width modulation unit makes this input voltage enter that this first winding fills within second scheduled time can this second electric capacity, makes this second predetermined voltage rise to this first predetermined voltage.
Preferably, this power-supply system more comprises detecting unit, couples this pulse-width modulation unit and this voltage output end, in order to detect the voltage of this voltage output end.
Preferably, this first winding has first end and the second end, and the first end of this first winding is electrically connected on this input voltage, and the first end of this first winding, the second end be coupled to this pulse-width modulation unit, and this power-supply system more comprises:
Switch, comprises control end, first end and the second end, and wherein the first end of this switch is coupled to the first end of this first winding, and the second end of this switch is coupled to earth terminal; And
The first coupling unit, one side of this first coupling unit is coupled between the control end and this earth terminal of this switch, and the opposite side of this first coupling unit couples this detecting unit, wherein, when this voltage output end is during in this first predetermined voltage, this first coupling unit of this detecting unit activation.
Preferably, the first end of this first winding, the second end are respectively coupled to first, second contact of this pulse-width modulation unit, this power-supply system more comprises the second coupling unit, one side of this second coupling unit is coupled between first contact and this earth terminal of this pulse-width modulation unit, the opposite side of this second coupling unit couples this detecting unit, wherein, when this voltage output end is during in this second predetermined voltage, this detecting unit decapacitation this this first coupling unit, and this second coupling unit of activation temporarily.
Preferably, the control end of this switch is coupled to this input voltage.
Preferably, this power-supply system more comprises switching circuit unit, this switching circuit unit is coupled between this first electric capacity and this energy-storage units, wherein the output of this first electric capacity couples the input of this energy-storage units, when this voltage output end is not when the output end voltage of the second predetermined voltage and this first electric capacity reaches the 3rd predetermined voltage, this switching circuit unit open; When this voltage output end is when the output end voltage of the second predetermined voltage and the first electric capacity reaches the 3rd predetermined voltage, this switching circuit cell conduction; The 3rd predetermined voltage is for driving the voltage of this switching circuit unit.
The invention has the beneficial effects as follows: can be by periodically decapacitation pulse-width modulation unit to reduce energy dissipation during power-supply system standby of the present invention, or when entering power-saving working mode, only provide continuous action load required low burning voltage, so compared to prior art, can significantly improve power-efficient.
For making those skilled in the art have further understanding and approval for structure, object and the effect of power-supply system of the present invention, hereby coordinate diagram to be described in detail as follows.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of known flyback power-supply system;
Fig. 2 A is the electrical block diagram of the power-supply system of first embodiment of the invention;
Fig. 2 B is the electrical block diagram of the power-supply system of another embodiment of the present invention;
Fig. 3 is the electrical block diagram of the power-supply system of second embodiment of the invention;
Fig. 4 is the electrical block diagram of the power-supply system of third embodiment of the invention.
Embodiment
For making the present invention more aobvious and understandable, below according to power-supply system of the present invention, especially exemplified by embodiment, coordinate appended graphic elaborating, but the embodiment providing is not in order to limit scope of patent protection of the present invention.
Please refer to Fig. 2 A, Fig. 2 A is the electrical block diagram of the power-supply system 200 of first embodiment of the invention, and power-supply system 200 comprises transformer T1, rectification filtering unit 241, energy-storage units 242, pulse-width modulation unit 210, back coupling unit 220, detecting unit 230, coupling unit PH1, PH2 and switch Q1.Transformer T1 comprises the first winding N1 and the second winding N2, and the first winding N1 is arranged on primary side and the second winding N2 is arranged on secondary side, and one end of the first winding N1 connects voltage input end Vin ', and the other end couples pulse-width modulation unit 210 to earth terminal.Rectification filtering unit 241 comprises the first rectification unit D1, the first capacitor C 1 and is electrically connected between the second winding N2 and reference potential.Energy-storage units 242 comprises the second rectification unit D2, the second capacitor C 2 and is electrically connected between the second winding N2 and reference potential, wherein the first capacitor C 1 and the second capacitor C 2 there is respectively voltage output end Vo1 and Vo2 can offered load, wherein the voltage output end under normal work or standby/battery saving mode that is carried on of electronic installation is respectively Vo1 and Vo2.In another embodiment, as Fig. 2 B, the output of the output of the first capacitor C 1 and the second capacitor C 2 sees through diode D3 and is connected generation voltage output end Vo1, wherein electronic installation to be carried on voltage output end under normal work or standby/battery saving mode be Vo1.Detecting unit 230 is coupled to the output of energy-storage units 242 in order to detect the voltage of this voltage output end, and the other end of detecting unit 230 couples coupling unit PH1 and PH2.Switch Q1 is metal-oxide half field effect transistor (MOSFET), but unrestricted, can also other switch elements replace, and the grid of switch Q1 (Gate) and source electrode (Source) be corresponding coupling unit PH1 and the earth terminal of coupling respectively.Pulse-width modulation unit 210 has control end 214, and wherein the drain electrode (Drain) of control end 214, switch Q1 is electrically connected to node A1 jointly with voltage input end Vin '.Back coupling unit 220 is coupled to the output of this first capacitor C 1, in order to produce feedback signal Sfb to pulse-width modulation unit 210.
Start explanation in detail, when electronic installation enters standby/battery saving mode by normal mode of operation, now detecting unit 230 can receive standby/battery saving mode signal SS, detecting unit 230 can be detected the output end voltage (node A2) of energy-storage units 242, if node A2 voltage is the first predetermined voltage Vmax, the control end 232 of detecting unit 230 can send high levels signal activation coupling unit PH1, now the grid of switch Q1 (Gate) sees through coupling unit PH1 to earth terminal, voltage input end Vin ' enters the control end 214 of pulse-width modulation unit 210 via node A1, in one embodiment of the invention but unrestricted condition, control end 214 utilizes the overvoltage protection port (Over Voltage Protection Pin) of pulse-width modulation unit 210, when control end 214 is received high levels signal (Vin '), pulse-width modulation unit 210 produces controls signal SC positive closing switch Q2, deboost input Vin ' enters the first winding N1, now the load terminal voltage of electronic installation is supplied by energy-storage units 242.Switch Q2 temporarily stops switching, until detecting unit 230 detecting node A2 voltage drop to the second predetermined voltage Vmax, the energy shortage that energy-storage units 242 stores is used with load under supply standby/battery saving mode, now the control end 234 of detecting unit 230 can send replacement signal Sre reset voltage protection port switch Q2 can be switched according to feedbacking signal Sfb, on the other hand, the control end 232 of detecting unit 230 sends low level signal decapacitation coupling unit PH1 simultaneously, now the grid of switch Q1 (Gate) sees through and is coupled to voltage input end Vin and conducting, the back coupling signal Sfb that switch Q2 produces according to back coupling unit 220 switches, feedback signal Sfb according to the output generation of the first capacitor C 1, make voltage input end Vin ' enter transformer T1 and fill energy energy-storage units 242 to first predetermined voltage Vmax.
In practical situations, the second capacitor C 2 stored energy capacitances are greater than approximately 1～10F of the first capacitor C 1, the second capacitor C 2, the first capacitor C 1 approximately 1～10 μ F, and the non-absolute limitations of numerical value, designer can comply with its demand designed, designed second capacitor C 2 and the first capacitor C 1 size.
In addition, between the grid of switch Q1 (Gate) and voltage input end Vin, be electrically connected to partial pressure unit R1, R2, its object is to make switch Q1 conducting after electronic installation is connected with the mains, and voltage input end Vin ' sees through switch Q1 bypass to earth terminal, guarantees can normally work after power supply connects.Input voltage vin sees through the elements T 2 of boosting and produces output voltage V in ', but designer can arrange the elements T 2 of boosting according to demand and not.
Please refer to Fig. 3, Fig. 3 is the electrical block diagram of the power-supply system 300 of second embodiment of the invention, in power-supply system 300, comprises transformer T1, rectification filtering unit 341, energy-storage units 342, switching circuit unit 350, pulse-width modulation unit 310, back coupling unit 320, detecting unit 330, coupling unit PH1, PH2 and switch Q1.Transformer T1 comprises the first winding N1 and the second winding N2, and the first winding N1 is arranged on primary side and the second winding N2 is arranged on secondary side, and one end of the first winding N1 connects voltage input end Vin ', and the other end couples pulse-width modulation unit 310 to earth terminal.Rectification filtering unit 341 comprises the first rectification unit D1, the first capacitor C 1 and is electrically connected between the second winding N2 and reference potential.Energy-storage units 342 comprise the second capacitor C 2 and the second capacitor C 2 there is voltage output end Vo can offered load.Switching circuit unit 350 is coupled between rectification filtering unit 341 and energy-storage units 342.Detecting unit 330 is coupled to the output of energy-storage units 342 in order to detect the voltage of this voltage output end, and the other end of detecting unit 330 couples coupling unit PH1 and PH2.Switch Q1 is metal-oxide half field effect transistor (MOSFET), but unrestricted, can also other switch elements replace, and the grid of switch Q1 (Gate) and source electrode (Source) be corresponding coupling unit PH1 and the earth terminal of coupling respectively.Pulse-width modulation unit 310 has control end 314, and wherein the drain electrode (Drain) of control end 314, switch Q1 is electrically connected to node A1 jointly with voltage input end Vin '.Back coupling unit 320 is coupled to the output of this first capacitor C 1, in order to produce feedback signal Sfb to pulse-width modulation unit 210.
Start explanation in detail, when electronic installation enters standby/battery saving mode by normal mode of operation, now detecting unit 330 can receive standby/battery saving mode signal SS, detecting unit 330 can be detected the output end voltage (node A2) of energy-storage units 342, if node A2 voltage is the first predetermined voltage Vmax, the control end 332 of detecting unit 230 can send high levels signal activation coupling unit PH1, now the grid of switch Q1 (Gate) sees through coupling unit PH1 to earth terminal, voltage input end Vin ' enters the control end 314 of pulse-width modulation unit 310 via node A1, in one embodiment of the invention but unrestricted condition, control end 314 utilizes the overvoltage protection port (Over Voltage Protection Pin) of pulse-width modulation unit 310, when control end 314 is received high levels signal (Vin '), pulse-width modulation unit 310 produces controls signal SC positive closing switch Q2, deboost input Vin ' enters the first winding N1, now the load terminal voltage of electronic installation is supplied by energy-storage units 342.Switch Q2 temporarily stops switching, until detecting unit 330 detecting node A2 voltage drop to the second predetermined voltage Vmax, represent that the energy shortage that energy-storage units 342 stores is used with load under supply standby/battery saving mode, now the control end 334 of detecting unit 330 can send replacement signal Sre reset voltage protection port switch Q2 can be switched according to feedbacking signal Sfb, on the other hand, the control end 332 of detecting unit 330 sends low level signal decapacitation coupling unit PH1 simultaneously, now the grid of switch Q1 (Gate) sees through and is coupled to voltage input end Vin and conducting, the back coupling signal Sfb that switch Q2 produces according to back coupling unit 320 switches, feedback signal Sfb according to the output generation of the first capacitor C 1, make voltage input end Vin ' enter transformer T1 and fill energy energy-storage units 342 to first predetermined voltage Vmax.Wherein switching circuit unit 350 is coupled between rectification filtering unit 341 and energy-storage units 342, when the output end voltage of node A2 voltage drop to the second predetermined voltage Vmax and the first capacitor C 1 does not reach the 3rd predetermined voltage, switching circuit unit 350 open circuit (Q4:OFF; Q3:OFF), until the output end voltage of the first capacitor C 1 is while reaching the 3rd predetermined voltage, this switching circuit conducting (Q4:ON; Q3:ON), in order to the second capacitor C 2 is charged, so, can increase feedback signal stable.This tertiary voltage is for driving the voltage of this switching circuit unit 350.
Please refer to Fig. 4, Fig. 4 is the electrical block diagram of the power-supply system 400 of third embodiment of the invention, the present embodiment is the variation aspect of the first embodiment, element numbers fellow repeats no more, difference is that control unit 430 do not detect the second capacitor C 2 output end voltages, and utilize while receiving standby/battery saving mode signal SS, periodically activation/decapacitation switch Q2, makes output end voltage Vo2 between the first predetermined voltage Vmax and the second predetermined voltage Vmax.
Further illustrate, when control unit 430 is received standby/battery saving mode signal SS, now output end voltage Vo2 is the first predetermined voltage Vmax, control unit 430 is controlled these pulse-width modulation unit 410 and within first scheduled time, is limited this input voltage vin ' enter this first winding N1, because of the load of electronic installation under standby/battery saving mode still lossy, make output end voltage Vo2 drop to the second predetermined voltage Vmax in the first predetermined voltage Vmax, wherein, because of the load condition of electronic installation under standby/battery saving mode known, and the second capacitor C 2 sizes are known, therefore can obtain the first scheduled time size.Therefore, after receiving that standby/battery saving mode signal SS is by first scheduled time, can expect that Vo2 drops to the second predetermined voltage Vmax in the first predetermined voltage Vmax, now, pulse-width modulation unit 410 makes input voltage vin according to feedback signal Sfb ' entering that this first winding N1 fills within second scheduled time can energy-storage units 441, wherein because of the load of electronic installation under standby/battery saving mode, the second capacitor C 2 sizes and fill can electric current knownly with voltage, therefore can obtain for second scheduled time big or small.In addition, the present embodiment also can be revised voltage output end as Fig. 2 B, the output of the output of the first capacitor C 1 and the second capacitor C 2 sees through diode D3 and is connected generation voltage output end Vo1, or is coupled between rectification filtering unit 341 and energy-storage units 342 as Fig. 3 switching circuit unit 350.
In sum, can be by decapacitation switch Q2 periodically to reduce energy dissipation during power-supply system standby of the present invention, or when entering power-saving working mode, only provide continuous action load required low burning voltage, so compared to prior art, can significantly improve power-efficient.
Although the present invention discloses as above with embodiment; so it is not in order to limit the present invention; those skilled in the art are not within departing from scope of patent protection of the present invention; can do various changes and retouching, so protection scope of the present invention is as the criterion when the scope of patent protection depending on accompanying claims institute circle.
Claims (10)
1. a power-supply system, is applied to electronic installation under power down mode, it is characterized in that, it comprises:
Transformer, this transformer has the first winding and the second winding, and this first winding is arranged at the primary side of this transformer to receive input voltage, and this second winding is arranged at the secondary side of this transformer;
The first rectification unit, is electrically connected on one end of this second winding;
The first electric capacity, is coupled to this first rectification unit;
Energy-storage units, is coupled to the secondary side of this transformer, has voltage output end, in order to provide voltage to load;
Back coupling unit, is electrically connected on the output of this first electric capacity, and produces feedback signal according to the voltage of this first electric capacity output; And
Pulse-width modulation unit, is connected in series with this first winding, according to this feedback signal in order to control this input voltage this first winding of flowing through;
Wherein, when the voltage of this voltage output end is the first predetermined voltage, this pulse-width modulation unit limits this input voltage and enters this first winding; When the voltage of this voltage output end is the second predetermined voltage, this pulse-width modulation unit makes this input voltage enter that this first winding fills according to this feedback signal can this energy-storage units;
Wherein, this first scheduled voltage is greater than this second scheduled voltage;
This power-supply system more comprises switching circuit unit, this switching circuit unit is coupled between this first electric capacity and this energy-storage units, wherein the output of this first electric capacity couples the input of this energy-storage units, when the voltage of this voltage output end output end voltage that is the second predetermined voltage and this first electric capacity does not reach the 3rd predetermined voltage, this switching circuit unit open; When the voltage of this voltage output end output end voltage that is the second predetermined voltage and the first electric capacity reaches the 3rd predetermined voltage, this switching circuit cell conduction; The 3rd predetermined voltage is for driving the voltage of this switching circuit unit.
2. power-supply system as claimed in claim 1, it is characterized in that, this energy-storage units comprises the second rectification unit and the second electric capacity, this the second rectification unit is electrically connected on one end of this second winding, this second electric capacity is coupled to this second rectification unit, and this second electric capacity provides voltage to this voltage output end.
3. power-supply system as claimed in claim 2, it is characterized in that, when the voltage of this voltage output end is the first predetermined voltage, this pulse-width modulation unit limits this input voltage and enters this first winding within first scheduled time, makes this first predetermined voltage drop to this second predetermined voltage.
4. power-supply system as claimed in claim 3, is characterized in that, this first scheduled time determines according to the load condition of this second electric capacity and this electronic installation.
5. power-supply system as claimed in claim 2, it is characterized in that, when the voltage of this voltage output end is the second predetermined voltage, this pulse-width modulation unit makes this input voltage enter that this first winding fills within second scheduled time can this second electric capacity, makes this second predetermined voltage rise to this first predetermined voltage.
6. power-supply system as claimed in claim 1, is characterized in that, this power-supply system more comprises detecting unit, couples this pulse-width modulation unit and this voltage output end, in order to detect the voltage of this voltage output end.
7. power-supply system as claimed in claim 6, it is characterized in that, this first winding has first end and the second end, and the first end of this first winding is electrically connected on this input voltage, and the first end of this first winding, the second end are coupled to this pulse-width modulation unit, and this power-supply system more comprises:
Switch, comprises control end, first end and the second end, and wherein the first end of this switch is coupled to the first end of this first winding, and the second end of this switch is coupled to earth terminal; And
The first coupling unit, one side of this first coupling unit is coupled between the control end and this earth terminal of this switch, and the opposite side of this first coupling unit couples this detecting unit, wherein, when the voltage of this voltage output end is this first predetermined voltage, this first coupling unit of this detecting unit activation.
8. power-supply system as claimed in claim 7, it is characterized in that, the first end of this first winding, the second end are respectively coupled to first, second contact of this pulse-width modulation unit, this power-supply system more comprises the second coupling unit, one side of this second coupling unit is coupled between first contact and this earth terminal of this pulse-width modulation unit, the opposite side of this second coupling unit couples this detecting unit, wherein, when the voltage of this voltage output end is this second predetermined voltage, this first coupling unit of this detecting unit decapacitation, and this second coupling unit of activation temporarily.
9. power-supply system as claimed in claim 7, is characterized in that, the control end of this switch is coupled to this input voltage.
10. power-supply system as claimed in claim 1, is characterized in that, the stored energy capacitance of this energy-storage units is greater than this first electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110430207.9A CN102570827B (en) | 2011-12-20 | 2011-12-20 | Power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110430207.9A CN102570827B (en) | 2011-12-20 | 2011-12-20 | Power system |
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| CN102570827A CN102570827A (en) | 2012-07-11 |
| CN102570827B true CN102570827B (en) | 2014-11-05 |
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| CN201110430207.9A Expired - Fee Related CN102570827B (en) | 2011-12-20 | 2011-12-20 | Power system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2703208A1 (en) * | 2012-09-04 | 2014-03-05 | ABB Technology AG | Controlling a modular converter |
| CN110620423B (en) * | 2018-06-19 | 2022-10-14 | 台达电子工业股份有限公司 | Power supply circuit and UPS auxiliary power supply system with same |
| CN112803759A (en) * | 2019-11-13 | 2021-05-14 | 奇源科技有限公司 | Power supply conversion device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101594057A (en) * | 2008-05-29 | 2009-12-02 | 电力集成公司 | Be used for realizing the method and apparatus of not adjusting park mode of power converter |
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| JP2001274658A (en) * | 2000-03-27 | 2001-10-05 | Mitsumi Electric Co Ltd | Intermittent oscillation circuit and oscillation circuit |
| TW200847602A (en) * | 2007-05-29 | 2008-12-01 | Richtek Techohnology Corp | Apparatus and method of improving flyback transformer light-loading efficacy |
| US8553431B2 (en) * | 2009-02-03 | 2013-10-08 | Iwatt Inc. | Switching power converter with load impedance detection |
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| CN101594057A (en) * | 2008-05-29 | 2009-12-02 | 电力集成公司 | Be used for realizing the method and apparatus of not adjusting park mode of power converter |
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| JP特开2001-274658A 2001.10.05 * |
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