CN102655375A - Exchange type power supply with frequency conversion device - Google Patents
Exchange type power supply with frequency conversion device Download PDFInfo
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- CN102655375A CN102655375A CN2011101321881A CN201110132188A CN102655375A CN 102655375 A CN102655375 A CN 102655375A CN 2011101321881 A CN2011101321881 A CN 2011101321881A CN 201110132188 A CN201110132188 A CN 201110132188A CN 102655375 A CN102655375 A CN 102655375A
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- 238000006243 chemical reaction Methods 0.000 title abstract 4
- 230000000087 stabilizing effect Effects 0.000 claims description 19
- 238000004804 winding Methods 0.000 claims description 17
- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000009466 transformation Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
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- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Abstract
The invention discloses a switching power supply with a frequency conversion device, which comprises a rectifying device, a voltage transformation device, an output circuit, a switching device, a pulse width modulation control device, a feedback circuit, a pulse width modulation control device and a frequency conversion modulation device for modulating the switching frequency of the pulse width modulation control device. The frequency conversion modulation device comprises a first frequency modulation resistor, a first reference voltage circuit and a second reference voltage circuit, wherein the first frequency modulation resistor is connected with the pulse width modulation control device, the second frequency modulation resistor is bridged between the pulse width modulation control device and a first bypass switch, the third frequency modulation resistor is bridged between the pulse width modulation control device and a second bypass switch, and the first bypass switch is connected with the first reference voltage circuit and the second bypass switch is connected with the second reference voltage circuit.
Description
Technical field
The present invention relates to a kind of power supply device, refer to a kind of power supply unit especially with converter plant.
Background technology
Switched power supplier as shown in Figure 1, rectifying device 11 receives an input ac voltage, and is rectified into the input that exports transformer T1 behind the direct current to.The first side winding of transformer T1 receives the direct current after the rectification, and storage power when switching device 13 cuts out, is sent to secondary side winding with the first side winding that is stored in transformer T1 in first side winding when utilizing switching device 13 conductings.Output circuit 15 is arranged at secondary and surveys between winding and the load, in order to direct voltage is exported to load.Feedback circuit 17 receives the output of switched power suppliers, the output of power supply unit is changed being sent to pulse width modulation through feedback circuit (Pulse Width Modulation, PWM) circuit 19, with control switch device 13.
When general switched power supplier is applied to underloading (Light Load) or no-load (No Load); The output energy is lower, if with normal switching frequency work, relatively the switched power supplier power consumption (as; The switching damage) ratio becomes big, causes overall efficiency to descend.When the switched power supplier collocation system when peak load (Peak Load) is used; Can be because of the consideration of material or cost; Limited the design of output driving force; When often causing switched power supplier to be applied to the system peak load, the situation of output voltage low (Voltage Drop) takes place.For example, when switched power supplier supply power to printer, because printer needs bigger power in starting moment, and promptly cause this moment the power supply unit output voltage to reduce easily, and can't start.In view of this, promptly need develop a kind of switched power supplier that can stablize power output when peak load (peak lord).
Summary of the invention
Main purpose of the present invention is to provide a kind of control circuit of the switching frequency through adjustable whole pulse width modulated control device (to call the PWM control device in the following text) to solve general traditional exchange formula power supply unit excessive problem of loss when underloading; And improve when being in peak load (peak lord); Output voltage is low, the problem that causes power output to reduce.
For reaching above-mentioned purpose, the present invention provides a kind of switched power supplier with converter plant, and it comprises a rectifying device, and in order to AC power is rectified into DC power supply, this rectifying device can be a bridge rectifier; One potential device in order to the DC power supply of transmission after this rectifying device rectification, transfers to secondary side winding from the first side winding of this potential device; One output circuit comprises a rectifier diode and a filter capacitor, and the DC power supply in order to this secondary side winding exports load device to; One switching device is connected in this first side winding; One PWM control device, it is connected in this switching device; One feedback circuit, the one of which end is coupled to this output circuit, and the other end is coupled to this PWM control device; One Frequency-variable Modulation device is used for the switching frequency of modulation (PWM) control device, comprises first frequency modulation resistance, is connected in this PWM control device; One first reference voltage circuit and one second reference voltage circuit are connected to this PWM control device, comprise the voltage stabilizing didoe electric capacity of voltage regulation of connecting respectively, and this electric capacity of voltage regulation parallel connection one triggers resistance; One second frequency modulation resistance, cross-over connection is between this PWM control device and one first by-pass switch, and this by-pass switch can be a semiconductor subassembly; One the 3rd frequency modulation(FM) resistance, cross-over connection is between PWM control device and one second by-pass switch, and wherein this by-pass switch can be a semiconductor subassembly; Wherein this first by-pass switch is connected in this first reference voltage circuit; And this second by-pass switch is connected in this second reference voltage circuit.
Have the embodiment of the switched power supplier of converter plant according to of the present invention another, wherein, be used for the Frequency-variable Modulation device of the switching frequency of modulation (PWM) control device, comprise one first reference voltage circuit and one second reference voltage circuit; One first frequency modulation resistance, second frequency modulation resistance and one the 3rd frequency modulation(FM) resistance, those resistance string downlink connection, wherein this first frequency modulation resistance connects the PWM control device; One first by-pass switch is connected in first reference voltage circuit; One second by-pass switch is connected in second reference voltage circuit; Wherein the two ends of this second frequency modulation resistance connect this first by-pass switch and this second by-pass switch respectively, and above-mentioned by-pass switch can be a semiconductor subassembly.
Description of drawings
Fig. 1 is the system block diagrams of known switched power supplier;
Fig. 2 is the switched power supplier circuit diagram according to embodiments of the invention;
Fig. 3 is the switched power supplier circuit diagram according to embodiments of the invention.
[primary clustering symbol description]
Rectifying device 11,201,301
Transformer T1
Switching device 13,203,303
Output circuit 15,205,305
Feedback circuit 17,207,307
Pulse width modulation control device 19,209,309
First frequency modulation resistance Rt1
Second frequency modulation resistance Rt2
The 3rd frequency modulation(FM) resistance R t3
The first by-pass switch Qt1
The second by-pass switch Qt2
Voltage stabilizing didoe Z1, Z2
Electric capacity of voltage regulation Ct1, Ct2
Trigger resistance R r1, Rr2
Frequency adjustment input RT
Feedback control signal end COMP
Embodiment
The present invention is for realizing a kind of raising frequency and frequency reducing of the switching frequency through adjusting pulse width modulation control device (to call the PWM control device in the following text) 209; And it is can frequency reducing energy-conservation that switched power supplier is achieved when load is in underloading, when the output of load overload, can increase the characteristics of power output with steady load by raising frequency.
As shown in Figure 2, be the circuit diagram with switched power supplier embodiment of variable ratio frequency changer device of the present invention.Switched power supplier is made up of rectifying device 201, transformer (potential device) T1, output circuit 205, switching device 203, pulse width modulation control device 209, feedback circuit 207 and Frequency-variable Modulation device among Fig. 2.Wherein this Frequency-variable Modulation device connects feedback circuit 207 and PWM control device 209 respectively.
The Frequency-variable Modulation device basic framework that on behalf of the present invention, Fig. 2 dotted line square propose, this Frequency-variable Modulation device is made up of first frequency modulation resistance Rt1, second frequency modulation resistance Rt2, the 3rd frequency modulation(FM) resistance R t3, the first by-pass switch Qt1, the second by-pass switch Qt2, first reference voltage circuit, second reference voltage circuit.Wherein first reference voltage circuit has voltage stabilizing didoe Z1, electric capacity of voltage regulation Ct1 and triggers resistance R r1, and this voltage stabilizing didoe Z1 series connection electric capacity of voltage regulation Ct1, and this electric capacity of voltage regulation Ct1 parallel connection triggers resistance R r1; Second reference voltage circuit has voltage stabilizing didoe Z2, electric capacity of voltage regulation Ct2 and triggers resistance R r2, and this voltage stabilizing didoe Z2 series connection electric capacity of voltage regulation Ct2, and this electric capacity of voltage regulation Ct2 parallel connection triggers resistance R r2.The end of the first frequency modulation resistance Rt1 of this Frequency-variable Modulation circuit is connected in the frequency adjustment input RT of PWM control device 209, other end ground connection; The end of second frequency modulation resistance Rt2 is connected in the frequency adjustment input RT of PWM control device 209, and the other end connects the first by-pass switch Qt1; And the end of the 3rd frequency modulation(FM) resistance R t3 is connected in the frequency adjustment input RT of PWM control device 209, and the other end connects the second by-pass switch Qt2.Feedback circuit 207 connects the feedback control signal end COMP of PWM control device 209, in order to detecting feedback circuit 207 from feedback signal that output transmitted.First reference voltage circuit and second reference voltage circuit are connected in feedback control signal end COMP to receive output output signal through voltage stabilizing didoe Z1 and Z2 respectively.The first by-pass switch Qt1 connects an end that triggers resistance R r1, and the second by-pass switch Qt2 connects an end that triggers resistance R r2.
When load that switched power supplier connected is in normal full load (Full Lord); The feedback control signal end COMP current potential that is fed back to PWM controller 209 by feedback circuit 207 can make voltage stabilizing didoe Z2 collapse; Trigger at this moment resistance R r2 and electric capacity of voltage regulation Ct2 charging and make by-pass switch Qt2 conducting; To regulate resistance R t1 parallelly connected with the 3rd frequency adjustment resistance R t3 and the external equiva lent impedance of PWM control device 209 frequency adjustment input RT is because of the second by-pass switch Qt2 conducting formation first frequency, and the output switching frequency of setting PWM control device 209 is general set point (about 60kHz～70kHz).
When load that switched power supplier connected is in underloading; The feedback control signal end COMP current potential of PWM control device 209 is lower than predetermined value, and deficiency is so that voltage stabilizing didoe Z1 and Z2 collapse, so by-pass switch Qt2 can not move; The external equivalence resistance of PWM control device 209 frequency adjustment input RT connects and is Rt1; (1-1) can know by formula, and the external equiva lent impedance of frequency adjustment input RT is big more, and the output switching frequency is low more; Switching frequency descends, and can reduce the power consumption of switched power supplier and reaches effect of saving energy.
Po：Output?power
Lp：The?inductance?in?the?transformer?primary?side
Ip：Primary?peak?current
Fsw：PWM?controller?frequency
When load that switched power supplier connected is in peak load (Peak Lord); The feedback control signal end COMP current potential that is fed back to PWM control device 209 by feedback circuit 207 can make voltage stabilizing didoe Z1 and Z2 collapse; Electric capacity of voltage regulation Ct1, Ct2 charging; And make diverter switch Qt1, Qt2 conducting, and the external equiva lent impedance of PWM control device 209 frequency adjustment input RT can be known by above-mentioned formula (1-1) because of the first by-pass switch Qt1 and second by-pass switch Qt2 conducting formation first frequency adjusting resistance R t1, second frequency adjusting resistance R t2 and the 3rd frequency adjustment resistance R t3 parallel connection; The external equiva lent impedance of frequency adjustment input RT is littler; The output switching frequency is higher, and the switching frequency rising when the PWM control device then can increase power output.
As shown in Figure 3, be the circuit diagram of another embodiment of the switched power supplier with variable ratio frequency changer device of the present invention.The Frequency-variable Modulation control circuit basic framework that on behalf of the present invention, Fig. 3 dotted line square propose, this Frequency-variable Modulation control circuit is made up of first frequency modulation resistance Rt1, second frequency modulation resistance Rt2, the 3rd frequency modulation(FM) resistance R t3, the first by-pass switch Qt1, the second by-pass switch Qt2, first reference voltage circuit, second reference voltage circuit.Wherein first reference voltage circuit has voltage stabilizing didoe Z1, electric capacity of voltage regulation Ct1 and triggers resistance R r1, and voltage stabilizing didoe Z1 series connection electric capacity of voltage regulation Ct1, and this electric capacity of voltage regulation Ct1 parallel connection triggers resistance R r1; Second reference voltage circuit has voltage stabilizing didoe Z2, electric capacity of voltage regulation Ct2 and triggers resistance R r2, and voltage stabilizing didoe Z2 series connection electric capacity of voltage regulation Ct2, and this electric capacity of voltage regulation Ct2 parallel connection triggers resistance R r2.First frequency modulation resistance Rt1, second frequency modulation resistance Rt2 and the 3rd frequency modulation(FM) resistance R t3 three of this Frequency-variable Modulation circuit are connected in series.The end of first frequency adjusting resistance R t1 is connected in the frequency adjustment input RT of PWM control device 309.Second frequency is regulated the end ground connection of resistance R t2, and the two ends of the 3rd frequency adjustment resistance R t3 regulate resistance R t1 with first frequency respectively and second frequency adjusting resistance R t2 is connected.The end of the 3rd frequency adjustment resistance R t3 connects the second by-pass switch Qt2, and the other end connects the first by-pass switch Qt1.Feedback circuit 307 connects the feedback control signal end COMP of PWM control device 309, in order to detecting feedback circuit 307 from feedback signal that output transmitted.First reference voltage circuit and second reference voltage circuit are connected in feedback control signal end COMP to receive output output signal through voltage stabilizing didoe Z1 and Z2 respectively.The first by-pass switch Qt1 connects an end that triggers resistance R r1, and the second by-pass switch Qt2 connects an end that triggers resistance R r2.
When load that switched power supplier connected is in normal full load (Full Lord); The feedback control signal end COMP current potential that is fed back to PWM controller 309 by feedback circuit 307 can let voltage stabilizing didoe Z1 collapse; Triggering resistance R r1 and electric capacity of voltage regulation Ct1 this moment continues charging and makes the first by-pass switch Qt1 conducting; And the external equiva lent impedance of PWM control device 209 frequency adjustment input RT is connected with Rt3 because of the first by-pass switch Qt1 conducting forms frequency adjustment resistance R t1, and the output switching frequency of setting PWM controller 309 then is general set point (about 60KHz～70KHz).
When load that switched power supplier connected is in underloading; The feedback control signal end COMP current potential of PWM control device 309 is lower than set point; Be not enough to let voltage stabilizing didoe Z1 and Z2 collapse, so the first by-pass switch Qt1, the second by-pass switch Qt2 can not move, the external equiva lent impedance of PWM control device 309 frequency adjustment input RT is that first frequency is regulated resistance R t1, second frequency regulates resistance R t2 and the 3rd frequency adjustment resistance R t3 connects; (1-1) can know by aforementioned formula; The external equiva lent impedance of frequency adjustment input RT is bigger, and the output switching frequency is lower, and switching frequency descends can reduce the power consumption on the switched power supplier; And then lifting efficient, reach effect of saving energy.
When load that switched power supplier connected is in peak load (Peak Lord); The feedback control signal end COMP current potential that feeds back to the PWM control device by feedback circuit 307 can rise and make voltage stabilizing didoe Z1, Z2 collapse; Electric capacity of voltage regulation Ct1, Ct2 charging, and make the first by-pass switch Qt1, the first by-pass switch Qt2 conducting, and the external equiva lent impedance of PWM control device 309 frequency adjustment input RT is regulated resistance R t1 because of the first by-pass switch Qt1, the second by-pass switch Qt2 conducting formation first frequency; Can know by aforementioned formula (1-1) formula; The external equiva lent impedance of RT is littler, and the output switching frequency is higher, when the switching frequency rising of PWM control device 309; And the increase power output then can promote the load driving ability.
Claims (4)
1. the power supply unit with converter plant is characterized in that, comprises:
One rectifying device is in order to be rectified into DC power supply with AC power;
One potential device in order to the DC power supply of transmission after this rectifying device rectification, transfers to secondary side winding from the first side winding of this potential device;
One output circuit, the DC power supply in order to this secondary side winding exports load device to;
One switching device is connected in this first side winding;
One pulse width modulation control device, it is connected in this switching device;
One feedback circuit, the one of which end is coupled to this output circuit, and the other end is coupled to this pulse width modulation control device;
One Frequency-variable Modulation device is used for the switching frequency of modulating pulse width modulation control device, and it comprises:
One first frequency modulation resistance is connected in this pulse width modulation control device;
One first reference voltage circuit and one second reference voltage circuit, it is connected to this pulse width modulation control device;
One second frequency modulation resistance, cross-over connection is between this pulse width modulation control device and one first by-pass switch;
One the 3rd frequency modulation(FM) resistance, cross-over connection is between pulse width modulation control device and one second by-pass switch;
Wherein this first by-pass switch is connected in this first reference voltage circuit; And
This second by-pass switch is connected in this second reference voltage circuit.
2. power supply unit as claimed in claim 1; It is characterized in that; This first reference voltage circuit and this second reference voltage circuit; In order to receive the feedback signal of this feedback circuit, this first reference voltage circuit and this second reference voltage circuit comprise a voltage stabilizing didoe respectively and are connected in an electric capacity of voltage regulation respectively, and this electric capacity of voltage regulation also connects a triggering resistance.
3. power supply unit as claimed in claim 1 is characterized in that, this by-pass switch is a semiconductor subassembly.
4. the power supply unit with converter plant is characterized in that, comprises:
One rectifying device is in order to be rectified into DC power supply with AC power;
One potential device in order to the DC power supply of transmission after this rectifying device rectification, transfers to secondary side winding from the first side winding of this potential device;
One output circuit, the DC power supply in order to this secondary side winding exports load device to;
One switching device is connected in this first side winding of this potential device;
One pulse width modulation control device, it is connected in this switching device;
One feedback circuit, the one of which end is coupled to this output circuit, and the other end is coupled to this pulse width modulation control device;
One Frequency-variable Modulation device is used for the switching frequency of modulating pulse width modulation control device, and it comprises:
One first reference voltage circuit and one second reference voltage circuit;
One first frequency modulation resistance, second frequency modulation resistance and one the 3rd frequency modulation(FM) resistance, those resistance string downlink connection, wherein this first frequency modulation resistance connects the pulse width modulation control device;
One first by-pass switch is connected in first reference voltage circuit;
One second by-pass switch is connected in second reference voltage circuit; Wherein
The two ends of this second frequency modulation resistance connect this first by-pass switch and this second by-pass switch respectively.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100107500A TW201238227A (en) | 2011-03-04 | 2011-03-04 | A switch power supply with frequency tuner |
| TW100107500 | 2011-03-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102655375A true CN102655375A (en) | 2012-09-05 |
Family
ID=46730927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101321881A Pending CN102655375A (en) | 2011-03-04 | 2011-05-20 | Exchange type power supply with frequency conversion device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102655375A (en) |
| TW (1) | TW201238227A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186856A (en) * | 2015-08-12 | 2015-12-23 | 深圳市华星光电技术有限公司 | Electromagnetic interference circuit for lowering PWM signal |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558540A (en) * | 2004-01-13 | 2004-12-29 | 台达电子工业股份有限公司 | Exchange type power supply and oscillator frequency adjuster thereof |
| CN1905343A (en) * | 2005-07-27 | 2007-01-31 | 三星Sdi株式会社 | Power supply and plasma display including the power supply |
| CN101359248A (en) * | 2008-09-18 | 2009-02-04 | 华硕电脑股份有限公司 | Power supplier with frequency conversion function and computer system thereof |
| CN101777845A (en) * | 2008-12-26 | 2010-07-14 | 康舒科技股份有限公司 | High-efficiency full range type switched power supplier |
| US20100232186A1 (en) * | 2009-03-13 | 2010-09-16 | Canon Kabushiki Kaisha | Switching power supply device |
-
2011
- 2011-03-04 TW TW100107500A patent/TW201238227A/en unknown
- 2011-05-20 CN CN2011101321881A patent/CN102655375A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558540A (en) * | 2004-01-13 | 2004-12-29 | 台达电子工业股份有限公司 | Exchange type power supply and oscillator frequency adjuster thereof |
| CN1905343A (en) * | 2005-07-27 | 2007-01-31 | 三星Sdi株式会社 | Power supply and plasma display including the power supply |
| CN101359248A (en) * | 2008-09-18 | 2009-02-04 | 华硕电脑股份有限公司 | Power supplier with frequency conversion function and computer system thereof |
| CN101777845A (en) * | 2008-12-26 | 2010-07-14 | 康舒科技股份有限公司 | High-efficiency full range type switched power supplier |
| US20100232186A1 (en) * | 2009-03-13 | 2010-09-16 | Canon Kabushiki Kaisha | Switching power supply device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186856A (en) * | 2015-08-12 | 2015-12-23 | 深圳市华星光电技术有限公司 | Electromagnetic interference circuit for lowering PWM signal |
| US9819333B2 (en) | 2015-08-12 | 2017-11-14 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Circuit for decreasing an electromagnetic interference of a PWM pulse modulation signal |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201238227A (en) | 2012-09-16 |
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Application publication date: 20120905 |