CN101860236A - Switching power supply - Google Patents
Switching power supply Download PDFInfo
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- CN101860236A CN101860236A CN 201010171369 CN201010171369A CN101860236A CN 101860236 A CN101860236 A CN 101860236A CN 201010171369 CN201010171369 CN 201010171369 CN 201010171369 A CN201010171369 A CN 201010171369A CN 101860236 A CN101860236 A CN 101860236A
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Abstract
The invention discloses a switching power supply which comprises an input-level EMI filter circuit unit, a rectifier circuit unit, a PFC detection circuit unit, a main switch circuit unit, a transformer isolation circuit unit, an output rectification filter circuit unit, a main control circuit unit, a current feedback circuit unit and a voltage feedback circuit unit; an input AC signal is rectified into a pulse DC electrical signal through the rectifier circuit unit and is directly provided for the main switch circuit unit for energy conversion; simultaneously, sampling is directly carried out in pulse direct current to ensure the stability and the reliability of the PFC detection circuit unit, remove high-voltage electrolytic capacitance used in input filtration, solve the problem of input surge, and realize power factor which is bigger than 0.95. The technical scheme adopts a double-output main control chip, outputs two circuits of signals with opposite phase, has adjustable dead time, and provides broad prospect for the development of the power supply.
Description
Technical field
The invention belongs to automatic field, relate to a kind of AC/DC power supply product, particularly relate to a kind of AC/DC Switching Power Supply.
Background technology
The present AC/DC power supply that has on the market, 300W is following does not generally have power factor emendation function, PF value can't satisfy the new forms of energy requirement, be lower than 75W just let alone power factor correction, this just makes during quite a few power supply uses, can serious interference electrical network.
Present AC/DC Switching Power Supply importation all needs jumbo alminium electrolytic condenser, will change into the operable direct current of late-class circuit through the Rectified alternating current of over commutation; Owing to use jumbo alminium electrolytic condenser, cause power supply product very big surge current to be arranged in the moment of cold start-up, so just electrical network is caused very big impact, cause very big EMI problem simultaneously.
Existing AC/DC product, if realization High Power Factor, just must add special pfc circuit in input stage, present pfc circuit is the Boost circuit, belongs to booster circuit, and output voltage must be higher than input voltage, can not realize the requirement isolated, in case front stage circuits goes wrong, will cause high pressure directly to impact late-class circuit, catastrophic effect will appear in back level equipment; Because multi-level pmultistage circuit causes cost to rise, can't popularize use in the AC/DC power supply product simultaneously, present middle low power AC/DC power supply product does not all add pfc circuit, causes power factor of electric network to descend, and has brought energy waste and electromagnetic interference problem.
Because the device that uses in the AC/DC power supply product, the life-span is the shortest, to the environment for use requirement the highest be exactly alminium electrolytic condenser, this is the bottleneck of present AC/DC power supply product MTBF index, directly influences reliability of products.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: with the miniaturization of AC/DC power supply, high powerization; Improve its High Power Factor, realize high efficiency; Realize good EMC characteristic, eliminate inrush current.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of Switching Power Supply, comprising:
Input AC signal element;
Input stage EMI filter unit links to each other with described input AC signal element, is used for the AC signal filtering to being imported;
The rectification circuit unit links to each other with described input stage EMI filter unit, and being used for filtered AC signal rectification is the pulsating direct current signal of telecommunication;
PFC testing circuit unit links to each other with described rectification circuit unit, is used to detect the zero-sum peak value excessively of the described pulsating direct current signal of telecommunication;
The main control loop unit links to each other with described PFC testing circuit unit, is used to receive from the reference signal of PFC testing circuit unit carry out PFC control;
The main switch circuit unit, link to each other with the main control loop unit with described rectification circuit unit, so that the pulsating direct current signal of telecommunication of described rectification circuit unit output enters the main switch circuit unit, the pulsating direct current signal of telecommunication is converted into the high-frequency switching signal of power frequency component modulation by described main control loop unit controls main switch circuit unit;
The transformer isolation circuit unit links to each other with described main switch circuit unit, is used for the high-frequency switching signal isolated variable;
The output rectification filtering unit links to each other with described transformer isolation circuit unit, is used for the high-frequency switching signal rectifying and wave-filtering to the output of transformer isolation circuit unit.
Wherein, described Switching Power Supply also comprises: the voltage feedback loop unit, its input links to each other with described output rectification filtering unit, its output links to each other with described main control loop unit, described voltage feedback loop unit is used for acquisition process output rectification filtering unit after handling treats output signal, and send into described main control loop unit, with real-time control output voltage.
Wherein, described Switching Power Supply also comprises: the current feedback circuit unit, its input links to each other with described main switch circuit unit, its output links to each other with described main control loop unit, described current feedback circuit unit is used for the main control loop unit is sent in the electric current variation of main switch circuit unit, with real-time control output current.
Wherein, described Switching Power Supply also comprises: the output loading unit, link to each other with described output rectification filtering unit, and be used to receive high-frequency switching signal from described output rectification filtering unit output.
Wherein, described power frequency component is identical with the pulsating direct current electrical signal phase of being imported.
Wherein, the integrated circuit form of described Switching Power Supply is: a kind of merging combination in the circuit of reversed excitation of PFC testing circuit unit and circuit of reversed excitation, push-pull circuit, active clamp, full-bridge circuit or the half-bridge circuit.
(3) beneficial effect
Compared with prior art, technique scheme has following advantage:
(1) the conventional switch power circuit is improved, the alminium electrolytic condenser that common output stage is used is removed, and power factor can be brought up to more than 0.95;
(2) owing to the alminium electrolytic condenser of having removed in the AC/DC power supply, for providing technique guarantee, can realize the metal base design of AC/DC power supply with the miniaturization of AC/DC power supply, high powerization, High Power Factor is provided simultaneously, realize high efficiency;
(3) provide the reliable technique assurance for the AC/DC power supply at high reliability, small size, high power density, High Power Factor, good EMC characteristic, the contour index request of elimination inrush current.
Description of drawings
Fig. 1 is the circuit diagram of the Switching Power Supply of the embodiment of the invention;
Fig. 2 is the theory diagram of the Switching Power Supply of the embodiment of the invention.
Wherein: 1: input AC signal element; 2: input stage EMI filter unit; 3:PFC testing circuit unit; 4: the rectification circuit unit; 5: the main control loop unit; 6: the main switch circuit unit; 7: the transformer isolation circuit unit; 8: the output rectification filtering unit; 9: the output loading unit; 10: the voltage feedback loop unit; 11: the current feedback circuit unit.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
The invention provides a kind of Switching Power Supply, Fig. 1 is the circuit diagram of Switching Power Supply, Fig. 2 is the theory diagram of Switching Power Supply, and this Switching Power Supply comprises: input stage EMI filter circuit unit 2, rectification circuit unit 4, PFC testing circuit unit 3, main switch circuit unit 6, transformer isolation circuit unit 7, output rectifier and filter unit 8, main control loop unit 5, current feedback loop unit 11 and voltage feedback circuit unit 10.
This Switching Power Supply adopts typical B uck-Boost off-line type (Flyback) main circuit, merged PFC testing circuit unit 3, it can be operated in continuous mode, critical conduction mode, under the non-continuous mode, because the design that has adopted PFC testing circuit unit 3 and main switch circuit unit 6 to merge, alminium electrolytic condenser in the input rectification circuit unit 4 is removed (the essential input filter capacitor of common AC/DC Switching Power Supply, the voltage signal that guarantees the main switch circuit unit is a direct current, require to satisfy conversion), like this with regard to the thorough problem that solves AC/DC power supply inrush current, power supply reduces significantly to the interference of miscellaneous equipment, good EMI performance is provided, owing to removed input alminium electrolytic condenser essential in the common AC/DC power supply, do not provide solution for the AC/DC power supply does not re-use alminium electrolytic condenser.
Technical scheme of the present invention is improved traditional Buck-Boost off-line type (Flyback) main circuit, adopt the circuit of reversed excitation pattern of paralleling and interleaving work, because the phase place of two-way output is opposite, make output current be in continuous mode all the time, thereby can save output filter capacitor (in the actual design process, in order to guarantee high-quality output, can add the electric capacity of low capacity usually) in output; Thoroughly cleared away dependence to alminium electrolytic condenser.
In the present embodiment, the AC signal is after input AC signal element 1 enters input stage EMI filter unit 2, enter rectification circuit unit 4, be rectified into the pulsating direct current signal of telecommunication, PFC testing circuit unit 3 detects zero passage, the peak value of the pulsating direct current signal of telecommunication, send into main control loop unit 5, for PFC control provides reference signal; Rectified alternating current directly enters main switch circuit unit 6, Rectified alternating current is converted into the high-frequency switching signal of 50HZ (or 60HZ) power frequency component (this power frequency component is identical with input pulsating direct current electrical signal phase) modulation by the main switch circuit unit 6 of main control loop unit 5 controls, high-frequency switching signal is behind transformer isolation circuit unit 7 isolated variables, the high-frequency switching signal that output needs, behind output rectifier and filter unit 8 rectifying and wave-filterings, deliver to load end; Main control loop unit 5 is sent the electric current variation of main switch circuit in current feedback loop unit 11, is used for being controlled in main control loop unit 5 in real time as output current is changed, and short circuit, over-current phenomenon avoidance that load end occurs are controlled; Main control loop unit 5 is sent into after with the signal acquisition process in the output loading in voltage feedback loop unit 10, is used for output voltage is controlled in real time, guarantees that output voltage fluctuates in the control range of needs;
Among the present invention, to import the AC signal rectification exactly and become the pulsating direct current signal of telecommunication, directly offer main switch circuit unit 6 and carry out power conversion, directly on Rectified alternating current, sample simultaneously, guarantee that pfc circuit is reliable and stable, just realized to import the high-pressure aluminum electrolytic electric capacity removal that filtering is used, solved input surge problem, realized power factor greater than 0.95.
Because the master control chip that adopts among the present invention is dual output (can only use road output control signal wherein), output two paths of signals phase place is opposite, and adjustable dead time is arranged, and just the development for this circuit provides wide prospect.
Circuit of reversed excitation among the present invention can directly be changed into circuit of reversed excitation, full-bridge or the half-bridge circuit of push-pull circuit, active clamp.
With the circuit diagram among Fig. 1 is example, introduces the working method of Switching Power Supply of the present invention.The AC signal of input 100-300V is handled through the prime EMC of C1 (safety electric capacity), L1 (common mode inductance) and C2 (safety electric capacity), L2 (common mode inductance) and C3 (safety electric capacity), enter rectifier bridge D1, become the pulsating direct current signal of telecommunication of 50HZ (or 60HZ), level EMC handles behind C5 (safety electric capacity), and the pulsating direct current signal of telecommunication enters main switch circuit.
The pulsating direct current signal of telecommunication is through dividing potential drop, the Filtering Processing of R10, R11, R12, R13, R14, R15, R16, R17, C13, C14, send into the PFC testing circuit of main control loop, finish detection, for the same-phase that realizes voltage, electric current provides foundation to phase place, peak value.
The pulsating direct current signal of telecommunication is handled through rectification, filtering and the current limliting of D7, C8, R1, for main control loop provides the startup energy.
The pulsating direct current signal of telecommunication is through T1, Q1, R3, forms the main circuit of importation, for the output stage of transformer T1 provides controlled power conversion.
Through R6, C9 feedback circuit, the current signal of input stage is fed back to main control loop, for the variation control of main circuit current provides foundation.
Main control loop realizes controlled PWM (pulse duration adjustment) power conversion through the service time of R2, R4 control switch pipe.
Through the winding of transformer T1, by the processing of D4, D5, D6, C6, C7, for main control loop provides the continuous and reliable energy.
Reach the circuit that links to each other with U2 by U2, realize output voltage signal is fed back to main control loop, for the controlled of output voltage given security.
Transformer T1 output provides the energy of voltage, controlled current through D12, C20, C21, C22, the rectification of C23, L3, Filtering Processing for client's load.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvement and replacement, these improvement and replacement also should be considered as protection scope of the present invention.
Claims (6)
1. a Switching Power Supply is characterized in that, comprising:
Input AC signal element (1);
Input stage EMI filter unit (2) links to each other with described input AC signal element (1), is used for the AC signal filtering to being imported;
Rectification circuit unit (4) links to each other with described input stage EMI filter unit (2), and being used for filtered AC signal rectification is the pulsating direct current signal of telecommunication;
PFC testing circuit unit (3) links to each other with described rectification circuit unit (4), is used to detect the zero-sum peak value excessively of the described pulsating direct current signal of telecommunication;
Main control loop unit (5) links to each other with described PFC testing circuit unit (3), is used for receiving from the reference signal of PFC testing circuit unit (3) carrying out PFC control;
Main switch circuit unit (6), link to each other with main control loop unit (5) with described rectification circuit unit (4), so that the pulsating direct current signal of telecommunication of described rectification circuit unit (4) output enters main switch circuit unit (6), the pulsating direct current signal of telecommunication is converted into the high-frequency switching signal of power frequency component modulation by control main switch circuit unit, described main control loop unit (5) (6);
Transformer isolation circuit unit (7) links to each other with described main switch circuit unit (6), is used for the high-frequency switching signal isolated variable;
Output rectification filtering unit (8) links to each other with described transformer isolation circuit unit (7), is used for the high-frequency switching signal rectifying and wave-filtering to transformer isolation circuit unit (7) output.
2. Switching Power Supply as claimed in claim 1, it is characterized in that, described Switching Power Supply also comprises: voltage feedback loop unit (10), its input links to each other with described output rectification filtering unit (8), its output links to each other with described main control loop unit (5), described voltage feedback loop unit (10) is used for acquisition process output rectification filtering unit (8) after handling treats output signal, and sends into described main control loop unit (5), with real-time control output voltage.
3. Switching Power Supply as claimed in claim 1, it is characterized in that, described Switching Power Supply also comprises: current feedback circuit unit (11), its input links to each other with described main switch circuit unit (6), its output links to each other with described main control loop unit (5), described current feedback circuit unit (11) is used for main control loop unit (5) is sent in the electric current variation of main switch circuit unit (6), with real-time control output current.
4. Switching Power Supply as claimed in claim 1, it is characterized in that, described Switching Power Supply also comprises: output loading unit (9), link to each other with described output rectification filtering unit (8), be used for receiving high-frequency switching signal from described output rectification filtering unit (8) output.
5. Switching Power Supply as claimed in claim 1 is characterized in that, described power frequency component is identical with the pulsating direct current electrical signal phase of being imported.
6. Switching Power Supply as claimed in claim 1, it is characterized in that the integrated circuit form of described Switching Power Supply is: a kind of merging combination in the circuit of reversed excitation of PFC testing circuit unit and circuit of reversed excitation, push-pull circuit, active clamp, full-bridge circuit or the half-bridge circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010171369 CN101860236A (en) | 2010-05-07 | 2010-05-07 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010171369 CN101860236A (en) | 2010-05-07 | 2010-05-07 | Switching power supply |
Publications (1)
| Publication Number | Publication Date |
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| CN101860236A true CN101860236A (en) | 2010-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010171369 Pending CN101860236A (en) | 2010-05-07 | 2010-05-07 | Switching power supply |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102076153A (en) * | 2011-01-26 | 2011-05-25 | 常州家加爱光电科技有限公司 | Constant-current adjustable power supply |
| CN102130493A (en) * | 2010-10-26 | 2011-07-20 | 北京鼎汉技术股份有限公司 | Method for power supply of direct current bus voltage-adjustable railway signal power module |
| CN102185481A (en) * | 2011-04-07 | 2011-09-14 | 马生茂 | Constant current source |
| CN102305640A (en) * | 2011-08-05 | 2012-01-04 | 中国石化集团第十建设公司 | Instrument power supply for live debugging |
| CN102371416A (en) * | 2011-10-18 | 2012-03-14 | 江苏科技大学 | Single-switch energy-saving inverter welding machine and control method |
| CN102548080A (en) * | 2010-12-15 | 2012-07-04 | 成都蜀昌科技有限公司 | High-efficiency long service life low-cost driving power source for LED (Light Emitting Diode) lighting energy saving lamp |
| CN103187027A (en) * | 2011-12-28 | 2013-07-03 | 三星电子株式会社 | Power supply device, display apparatus having the same, and power supply method |
| WO2017147790A1 (en) * | 2016-03-01 | 2017-09-08 | Astec International Limited | Switch mode power supplies including primary side clamping circuits controlled based on secondary side signals |
| CN109155584A (en) * | 2016-04-15 | 2019-01-04 | 艾默生环境优化技术有限公司 | Choke coil and electromagnetic interface filter circuit for circuit of power factor correction |
| WO2019056318A1 (en) * | 2017-09-22 | 2019-03-28 | Oppo广东移动通信有限公司 | Power supply circuit, power supply device, and control method |
| WO2019056320A1 (en) * | 2017-09-22 | 2019-03-28 | Oppo广东移动通信有限公司 | Power supply circuit, power supply device, and control method |
| WO2019056317A1 (en) * | 2017-09-22 | 2019-03-28 | Oppo广东移动通信有限公司 | Power supply circuit, power supply device, and control method |
| US11133700B2 (en) | 2017-04-25 | 2021-09-28 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Power supply device and charging control method |
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| CN101686587A (en) * | 2008-09-25 | 2010-03-31 | 皇家飞利浦电子股份有限公司 | Drive for providing variable power for LED array |
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Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130493B (en) * | 2010-10-26 | 2013-08-21 | 北京鼎汉技术股份有限公司 | Method for power supply of direct current bus voltage-adjustable railway signal power module |
| CN102130493A (en) * | 2010-10-26 | 2011-07-20 | 北京鼎汉技术股份有限公司 | Method for power supply of direct current bus voltage-adjustable railway signal power module |
| CN102548080A (en) * | 2010-12-15 | 2012-07-04 | 成都蜀昌科技有限公司 | High-efficiency long service life low-cost driving power source for LED (Light Emitting Diode) lighting energy saving lamp |
| CN102076153A (en) * | 2011-01-26 | 2011-05-25 | 常州家加爱光电科技有限公司 | Constant-current adjustable power supply |
| CN102185481A (en) * | 2011-04-07 | 2011-09-14 | 马生茂 | Constant current source |
| CN102185481B (en) * | 2011-04-07 | 2013-09-25 | 马生茂 | Constant current source |
| CN102305640A (en) * | 2011-08-05 | 2012-01-04 | 中国石化集团第十建设公司 | Instrument power supply for live debugging |
| CN102371416B (en) * | 2011-10-18 | 2014-03-12 | 江苏科技大学 | Single-switch energy-saving inverter welding machine |
| CN102371416A (en) * | 2011-10-18 | 2012-03-14 | 江苏科技大学 | Single-switch energy-saving inverter welding machine and control method |
| CN103187027A (en) * | 2011-12-28 | 2013-07-03 | 三星电子株式会社 | Power supply device, display apparatus having the same, and power supply method |
| WO2017147790A1 (en) * | 2016-03-01 | 2017-09-08 | Astec International Limited | Switch mode power supplies including primary side clamping circuits controlled based on secondary side signals |
| US9991799B2 (en) | 2016-03-01 | 2018-06-05 | Astec International Limited | Switch mode power supplies including primary side clamping circuits controlled based on secondary side signals |
| CN109155584B (en) * | 2016-04-15 | 2020-10-16 | 艾默生环境优化技术有限公司 | Choke coil and EMI filter circuit for power factor correction circuit |
| CN109155584A (en) * | 2016-04-15 | 2019-01-04 | 艾默生环境优化技术有限公司 | Choke coil and electromagnetic interface filter circuit for circuit of power factor correction |
| US11133700B2 (en) | 2017-04-25 | 2021-09-28 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Power supply device and charging control method |
| WO2019056320A1 (en) * | 2017-09-22 | 2019-03-28 | Oppo广东移动通信有限公司 | Power supply circuit, power supply device, and control method |
| CN109804542A (en) * | 2017-09-22 | 2019-05-24 | Oppo广东移动通信有限公司 | Power supply provides circuit, power supply provides equipment and control method |
| CN109804541A (en) * | 2017-09-22 | 2019-05-24 | Oppo广东移动通信有限公司 | Power supply provides circuit, power supply provides equipment and control method |
| CN109845082A (en) * | 2017-09-22 | 2019-06-04 | Oppo广东移动通信有限公司 | Power supply provides circuit, power supply provides equipment and control method |
| EP3657660A4 (en) * | 2017-09-22 | 2020-07-08 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Power supply circuit, power supply device, and control method |
| WO2019056317A1 (en) * | 2017-09-22 | 2019-03-28 | Oppo广东移动通信有限公司 | Power supply circuit, power supply device, and control method |
| US10819246B2 (en) | 2017-09-22 | 2020-10-27 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Power supply circuit based on feedback signal, power supply device and control method |
| US10840815B2 (en) | 2017-09-22 | 2020-11-17 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Power supply circuit based on feedback signal, power supply device and control method |
| CN109845082B (en) * | 2017-09-22 | 2021-01-19 | Oppo广东移动通信有限公司 | Power supply circuit, power supply device, and control method |
| CN109804541B (en) * | 2017-09-22 | 2021-05-18 | Oppo广东移动通信有限公司 | Power supply circuit, power supply device, and control method |
| CN109804542B (en) * | 2017-09-22 | 2021-06-11 | Oppo广东移动通信有限公司 | Power supply circuit, power supply device, and control method |
| WO2019056318A1 (en) * | 2017-09-22 | 2019-03-28 | Oppo广东移动通信有限公司 | Power supply circuit, power supply device, and control method |
| US11251712B2 (en) | 2017-09-22 | 2022-02-15 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Power supply circuit, power supply device and control method |
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Application publication date: 20101013 |