CN1118129C - Mixed pulses modulated switching power supply - Google Patents
Mixed pulses modulated switching power supply Download PDFInfo
- Publication number
- CN1118129C CN1118129C CN00122047A CN00122047A CN1118129C CN 1118129 C CN1118129 C CN 1118129C CN 00122047 A CN00122047 A CN 00122047A CN 00122047 A CN00122047 A CN 00122047A CN 1118129 C CN1118129 C CN 1118129C
- Authority
- CN
- China
- Prior art keywords
- transformer
- power supply
- switching power
- resonant capacitor
- switching tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention discloses a mixed pulse modulation type switching power supply which comprises a direct current voltage input end, a transformer, a main switching tube, a resonant capacitor and a control circuit, wherein the resonant capacitor is connected in parallel with the primary side of the transformer; one end of the main switching tube is connected with one end of the primary side of the transformer, and the other end is connected with the ground; the control end of the main switching tube is connected with the output signals of a control circuit. The present invention is characterized in that the mixed pulse modulation type switching power supply also comprises a forward feedback sampling resistor, wherein one end of the forward feedback resistor is connected with the positive end of the direct current voltage input end, and the other end is connected to a triangular wave oscillator of a pulse width modulator; the forward feedback sampling resistor is used as one part of a clock oscillation charging signal. The present invention ensures the high reliability of the operation of the main switching tube.
Description
The present invention relates to a kind of mixed pulses modulated switching power supply, especially for the power supply in the gsm mobile communication system.
In mobile communication system, because the particularity of its equipment is also had higher requirement to the overall dimension of power module, that is to say, on its power density, have higher requirement.In order to satisfy the requirement of its high power density, we have to select for use high efficiency main topological circuit---resonance clamp single-end ortho-exciting circuit.The characteristics of its main circuit are: 1, the value of duty cycle, delta can be greater than 50%, less than 100%; 2, adopt resonant capacitor to remove magnetic energy remaining on the main transformer, this is than high several percentage points of the efficient that increases the degaussing winding on the transformer.Like this, main transformer is in processing, and is both simple, convenient, and volume can be done forr a short time again.What its control circuit adopted is primary current type control mode.But when resonance clamp single-end ortho-exciting circuit adopted the resonant capacitor degaussing, its normal duty cycle, delta of using was generally less than 50%.The value of duty cycle, delta greater than 50%, less than 100% situation under, power module is not in input voltage height, the frequent short circuit of output, when decontroling, need several bouts main switch will be broken again.
Purpose of the present invention is exactly in order to overcome the above problems, a kind of mixed pulses modulated switching power supply is provided, make its value of duty cycle, delta greater than 50%, less than 100% situation under, no matter how output loading changes, and power module still can be worked fine, reliably and be unlikely and be burnt out main switch.
The present invention realizes that the scheme of above-mentioned purpose is: a kind of mixed pulses modulated switching power supply, comprise dc voltage input end, transformer, main switch, resonant capacitor and control circuit, resonant capacitor is in parallel with the former limit of transformer, one end of main switch links to each other with an end on the former limit of transformer, other end ground connection, the output signal of its control end connection control circuit, it is characterized in that: also comprise the feedforward sampling resistor, its end links to each other with the anode of dc voltage input end, the other end is received on triangular wave oscillator (R/Ct) pin of pulse width modulator, be added on triangular wave oscillator (R/Ct) pin of pulse width modulator so that take out a voltage signal, as the part of clock oscillation charging signals from direct current input anode (Vin).
Owing to adopted above scheme, come maximum duty cycle (becoming pulsewidth and frequency is modulated simultaneously) in the restricting circuits by the feedforward sampling resistor by original simple pulse-width modulation, thereby reach the control main transformer in input high voltage, the frequent short circuit of output, ceiling capacity when decontroling again can be fully by resonant capacitor institute nip, guaranteed that the maximum shutoff voltage value on the switching tube in the operating voltage range that switching tube itself is allowed, has so just guaranteed the reliability of main switch work.
Fig. 1 is the circuit diagram of the embodiment of the invention.
Also the present invention is described in further detail in conjunction with the accompanying drawings below by specific embodiment.
Proposition of the present invention is based on following basic discovery: the value of duty cycle, delta greater than 50%, less than 100% situation under, why can cause in the reason of burning pipe under some extreme case with the resonant capacitor degaussing mainly is in the main transformer degaussing.The highest at input voltage, when the output suddenly-applied short circuit is decontroled again, be stored in the energy maximum on the main transformer this moment, if this energy that is stored in the transformer can't discharge (when using resonant capacitor degaussing and duty ratio big very soon, this situation will appear), the voltage that is added in main switch drain-source interpolar so will dash high more more, in case when the voltage on this switching tube Vd-s exceeded its limit withstand voltage, switching tube will breakdown, damage.(but be not the value of duty cycle, delta greater than 50% switching tube that just is bound to damage, but just can this thing happens when limiting condition, the present invention realizes its goal of the invention by the maximum occurrences of duty cycle, delta under the restriction limiting condition).
Analyze in view of the above, design of the present invention as shown in Figure 1.
Original former control circuit is a PDM keyer PWM the most in vogue at present, as among Fig. 1 being exactly a PDM keyer PWM who is made up of pulse width modulating chip UC3843.It comprises dc voltage input end Vin, transformer T, main switch S, resonant capacitor C2 and control circuit, resonant capacitor C2 is in parallel with the former limit of transformer T, the end of main switch S links to each other with an end on the former limit of transformer T, other end ground connection, the output signal of its control end connection control circuit.
In order to solve transformer degaussing problem, in this circuit, special (can adopt to be greater than or equal to 1/4th watts resistor, its resistance value can be decided according to physical circuit by feedforward sampling resistor R1.) take out a voltage signal from direct current input Vin anode and be added on the triangular wave oscillator R/Ct pin (being UC3843 the 4th pin) of pulse width modulator, this just has been transformed into a typical PDM keyer PWM a not only frequency modulation but also transfer wide pulse mixture control PHM.Its operation principle is: when input voltage changed, its clock oscillator triangle wave frequency also changed thereupon.In output loading one regularly, input voltage is high more, and pulse duration is narrow more, and oscillation frequency clock is just high more; At input voltage one regularly, load is big more, and pulse duration is wide more, and frequency of oscillation is constant.
Secondary power supply module with the input of 48V voltage is an example, and the maximum withstand voltage of its main switch is all elected 200V as usually.Choosing of this key components parameter value generally all will be followed high efficiency, principle cheaply.The effect of the present invention in this main circuit is mainly: come maximum duty cycle δ in the restricting circuits by feedforward sampling resistor R1, thereby reach the control main transformer in input high voltage, the frequent short circuit of output, ceiling capacity when decontroling again can be fully by resonant capacitor C2 institute nip, guaranteed that maximum shutoff voltage value on the switching tube Vd-s in the operating voltage range that switching tube itself is allowed, has so just guaranteed the reliability of main switch work.
The pulse width modulating chip model of embodiment shown in Fig. 1 is UC3843, but also can adopt UC3842, and UC3842 and UC3843 common ground are: 1, the chip internal function is identical; 2, both are current mode PWM modulator; 3, maximum duty cycle δ is all less than 100%.The difference of the two is: cut-in voltage (UVLO ON) is different with shutoff voltage (UVLO OFF).The cut-in voltage of UC3842 is 16.0V, and shutoff voltage is 10.0V, and the cut-in voltage of UC3843 is 8.5V, and shutoff voltage is 7.9V.
The present invention only needs to increase a resistor that is greater than or equal to 1/4th watts on circuit, just can realize this function.On cost, almost can ignore.This is invented, and not only circuit is simple, and of paramount importance be that it can solve unsolved problem in the primary circuit fully.
Claims (2)
1, a kind of mixed pulses modulated switching power supply, comprise dc voltage input end (Yin), transformer (T), main switch (S), resonant capacitor (C2) and control circuit, resonant capacitor (C2) is in parallel with the former limit of transformer (T), one end of main switch (S) links to each other with an end on the former limit of transformer (T), other end ground connection, the output signal of its control end connection control circuit, it is characterized in that: also comprise feedforward sampling resistor (R1), its end links to each other with the anode of dc voltage input end (Vin), the other end is received on triangular wave oscillator (R/Ct) pin of pulse width modulator, be added on triangular wave oscillator (R/Ct) pin of pulse width modulator so that take out a voltage signal, as the part of clock oscillation charging signals from direct current input anode (Vin).
2, mixed pulses modulated switching power supply as claimed in claim 1 is characterized in that: described feedforward sampling resistor (R1) is a resistor that is greater than or equal to 1/4th watts.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00122047A CN1118129C (en) | 2000-08-01 | 2000-08-01 | Mixed pulses modulated switching power supply |
| AU2002223396A AU2002223396A1 (en) | 2000-08-01 | 2001-07-30 | Pulse mixing modulated - type switching power supply |
| PCT/CN2001/001212 WO2002025799A1 (en) | 2000-08-01 | 2001-07-30 | Pulse mixing modulated - type switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00122047A CN1118129C (en) | 2000-08-01 | 2000-08-01 | Mixed pulses modulated switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1281288A CN1281288A (en) | 2001-01-24 |
| CN1118129C true CN1118129C (en) | 2003-08-13 |
Family
ID=4589049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00122047A Expired - Lifetime CN1118129C (en) | 2000-08-01 | 2000-08-01 | Mixed pulses modulated switching power supply |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1118129C (en) |
| AU (1) | AU2002223396A1 (en) |
| WO (1) | WO2002025799A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004138958A (en) * | 2002-10-21 | 2004-05-13 | Semiconductor Energy Lab Co Ltd | Display device |
| JP4750582B2 (en) * | 2006-02-27 | 2011-08-17 | ルネサスエレクトロニクス株式会社 | Triangular wave oscillation circuit |
| CN101056061B (en) * | 2006-04-14 | 2012-12-05 | 艾默生网络能源系统北美公司 | A resonance circuit modulation control method and system |
| CN101106332B (en) * | 2007-06-28 | 2010-04-21 | 华为技术有限公司 | A switch power device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0119883B1 (en) * | 1994-12-22 | 1997-10-30 | 김광호 | Switching source apparatus for controller |
| JPH10510139A (en) * | 1995-09-25 | 1998-09-29 | フィリップス エレクトロニクス ネムローゼ フェンノートシャップ | Power supply circuit |
-
2000
- 2000-08-01 CN CN00122047A patent/CN1118129C/en not_active Expired - Lifetime
-
2001
- 2001-07-30 WO PCT/CN2001/001212 patent/WO2002025799A1/en active Application Filing
- 2001-07-30 AU AU2002223396A patent/AU2002223396A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002025799A1 (en) | 2002-03-28 |
| CN1281288A (en) | 2001-01-24 |
| AU2002223396A1 (en) | 2002-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110224612B (en) | Asymmetric half-bridge converter and control method | |
| US6834002B2 (en) | Power factor correction circuit | |
| CN102104323B (en) | Power supply changeover device and method | |
| CN1374740B (en) | Inverter | |
| US20030142521A1 (en) | Switching power source device | |
| CN102377358B (en) | System and method for reducing standby power consumption of power converter with switching mode | |
| AU5884500A (en) | Dynamically-switched power converter | |
| CN101860240B (en) | Feedback circuit with feedback impedance modulation | |
| CN100576709C (en) | Multi-resonance converter | |
| CN100438296C (en) | DC-DC converter | |
| Seo et al. | Asymmetrical PWM flyback converter | |
| CN1118129C (en) | Mixed pulses modulated switching power supply | |
| CN202231629U (en) | Power adapter of all-in-one computer | |
| CN1047697C (en) | Power-supply circuit with transformer and on/off switch at secondary side of transformer | |
| US6072702A (en) | Ringing choke converter | |
| CN108199579A (en) | A kind of high no-load voltage ratio Sofe Switch DC-DC buck converters with coupling inductance | |
| CN208739450U (en) | Emergency LED drive system | |
| KR20030011293A (en) | Self-driven synchronous rectifier circuit for non-optimal reset secondary voltage | |
| CN1787350B (en) | Pulsewidth modulator having electricity saving mode | |
| CN201252495Y (en) | Frequency-converting energy-saving device | |
| JPH07123707A (en) | Partial resonance type constant-frequency pwm controlled dc-dc converter | |
| CN211127586U (en) | LL C resonant transformation circuit | |
| JP3570406B2 (en) | Drive circuit for semiconductor switching element | |
| KR102724925B1 (en) | Device for resetting the magnetic field energy caused by the magnetization inductance and recovering the magnetic field energy caused by the leakage inductance of a soft switching converter and high efficiency soft switching converter comprising the same and lighting device with reset coil | |
| CN2798158Y (en) | Switch electric source apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: POWER SUPPLY PRODUCTS (SHENZHEN) CO., LTD. Free format text: FORMER OWNER: AIMOSHENG NETWORK ENERGY SOURCE CO LTD Effective date: 20140903 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 518057 SHENZHEN, GUANGDONG PROVINCE TO: 518101 SHENZHEN, GUANGDONG PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20140903 Address after: 518101 Guangdong city of Shenzhen province Baoan District Xin'an road two North 68 Street office Honglang District Industrial Park plant Patentee after: Astec power supply (Shenzhen) Co., Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: Aimosheng Network Energy Source Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20030813 |
|
| CX01 | Expiry of patent term |