CN104917385A - Noise reduction type small isolated high-frequency square wave DC-DC power supply - Google Patents
Noise reduction type small isolated high-frequency square wave DC-DC power supply Download PDFInfo
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- CN104917385A CN104917385A CN201510265532.2A CN201510265532A CN104917385A CN 104917385 A CN104917385 A CN 104917385A CN 201510265532 A CN201510265532 A CN 201510265532A CN 104917385 A CN104917385 A CN 104917385A
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Abstract
The invention discloses a noise reduction type small isolated high-frequency square wave DC-DC power supply, relates to the field of micro power supplies, and aims to solve the technical problem that an existing square wave power supply is vulnerable to interference of coil electromagnetic noises, the output waveform is distorted, the transmission performance is low, the output level is unreliable and the like. A circuit structure of the noise reduction type small isolated high-frequency square wave DC-DC power supply is characterized by comprising a power supply input end, wherein the power supply input end is connected to a primary winding of a coil device, a secondary winding of the coil device is connected to a noise reduction module, and the noise reduction module is connected to a Schmitt trigger. The noise reduction type small isolated high-frequency square wave DC-DC power supply is applied to power supply noise reduction.
Description
Technical field
The present invention relates to micro power field, be specifically related to a kind of noise reduction type isolation type high frequency square wave DC-DC power source.
Background technology
In Power Management Design, usually power input and external circuit are isolated, do not affect by external circuit with protection power source.Isolation has two kinds of usual ways: optical coupling and electromagnetic isolation.The problems such as it is easily aging that optical coupling exists LED, and transmission frequency is limited, make the coupled modes that electromagnetic isolation becomes more excellent.It is fast that electromagnetic isolation has speed, low in energy consumption and reliability high.But existing electromagnetic isolation formula micro power, when input voltage is less, all kinds of electromagnetic interference that micro power is subject to will be can not ignore, and cause output waveform to distort, export instability.Wherein, particularly highlightedly, the electromagnetic noise that retarder produces causes afterbody disturbance or the vibration of transition waveform, and this noise level parameter is contrary with transition waveform level parameters, and the most remarkable at the afterbody of transition waveform.Because intermediate voltage radix is too small, this noise can not eliminate by common filter rectifier, thus finally cause output waveform to distort, the problems such as transmission performance reduces and output level is unreliable.
Summary of the invention
For above-mentioned prior art, the object of the invention is to provide a kind of noise reduction type isolation type high frequency square wave DC-DC power source, the problems such as it is intended to solve existing square wave power and is subject to coil electromagnetism noise jamming, and output waveform has distortion, and the low and output level of transmission performance is unreliable.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of noise reduction type isolation type high frequency square wave DC-DC power source, comprise power input, a winding of power input connecting coil device, the secondary winding of coil component is connected with noise and reduces module, and noise reduces model calling Schmidt trigger.
In such scheme, described power input, comprises the first buffer register in parallel and the second buffer register; Also comprise delayer, delayer is connected with the second buffer register.Power supply input, outlet chamber frequency and phase matched are provided, realize synchronous or asynchronous transmission function.
In such scheme, described coil component, comprises miniature transformer, in particular a kind of annular micro-transformer, forms electromagnetic isolation in power supply input, outlet chamber, and has less coil electromagnetism noise.
In such scheme, described noise reduces module, and comprise the output loop for waveform reconstruction, output loop comprises first switch of connecting with coil component secondary winding, Schmidt trigger, second switch; Comprise the short-circuit loop for truncation noise, short-circuit loop comprises three switch in parallel with coil component secondary winding, the 4th switch of connecting with the 3rd switch.Input feedback timing unit has the function of each switch that is automatically turned on or off, its control inputs ON time, thus blocks transition waveform, leaches afterbody noise, intercepts out effective waveform; Schmidt trigger has the function that the transition waveform after to noise reduction carries out output waveform reconstruction, realizes complete, accurate, reliable DC-DC and exports.
In such scheme, also comprise input feedback timing unit, input feedback timing unit comprises high level end connecting coil device secondary winding and the first comparator of low level end connection divider resistance; High level end connects divider resistance and the second comparator of the secondary winding of low level end connecting coil device; S holds connection first comparator output terminal and the rest-set flip-flop of R end connection second comparator output terminal; Also comprise and hold with rest-set flip-flop Q the monostable flipflop be connected, monostable flipflop controls the first switch, second switch by feedback loop, also by connecting inverter controlling the 3rd switch, the 4th switch.Rest-set flip-flop, the first comparator, the second comparator and monostable flipflop have input synchronization timing function, and monostable flipflop, by controlling each switch conduction or disconnection, realizes the input conducting of coil component secondary winding and short circuit.
In such scheme, described first open the light and second switch be connected with divider resistance; The 3rd described switch and the 4th switch are connected with divider resistance, protection switch circuit, set up comparator reference voltage.
Accompanying drawing explanation
Fig. 1 is circuit structure block diagram of the present invention;
Fig. 2 is specific embodiment of the invention circuit diagram;
Fig. 3 is specific embodiment of the invention oscillogram;
Fig. 4 is existing isolated DC-DC power supply;
In figure: 1-power input, 2-coil component, 3-noise reduces module, 4-Schmidt trigger, 5-delay unit, 6-first buffer register, 7-second buffer register, the transition waveform of 8-the foot section brought noise, the effective waveform of 9-, 10-second comparator, 11-first comparator, 12-RS trigger, 13-inverter, 14-monostable flipflop.
Embodiment
All features disclosed in this specification, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Below in conjunction with accompanying drawing, the present invention will be further described:
Fig. 1 is circuit structure block diagram of the present invention, a kind of noise reduction type isolation type high frequency square wave DC-DC power source, comprise power input 1, a winding of power input 1 connecting coil device 2, the secondary winding of coil component 2 is connected with noise and reduces module 3, and noise reduces module 3 and is connected with Schmidt trigger 4.Described power input 1, comprises the first buffer register 6 and the second buffer register 7 in parallel; Also comprise delayer 5, delayer 5 is connected with the second buffer register 7.Described coil component 2, comprises miniature transformer.Described noise reduces module 3, and comprise the output loop for waveform reconstruction, output loop comprises first switch S 1 of connecting with coil component 1 secondary winding, Schmidt trigger 4, second switch S2; Comprise the short-circuit loop for truncation noise, short-circuit loop comprises three switch S 3 in parallel with coil component 2 secondary winding, the 4th switch S 4 of connecting with the 3rd switch S 3.Also comprise input feedback timing unit, input feedback timing unit comprises high level end connecting coil device 2 secondary winding and the first comparator 11 of low level end connection divider resistance; High level end connects divider resistance and the second comparator 10 of the secondary winding of low level end connecting coil device 4; S holds connection first comparator 11 output and the rest-set flip-flop 12 of R end connection second comparator 10 output; Also comprise the monostable flipflop 14 held with rest-set flip-flop Q and be connected, monostable flipflop 14 controls the first switch S 1, second switch S2 by feedback loop, also by connecting inverter controlling the 3rd switch S 3, the 4th switch S 4.Described first S1 and second switch S2 that opens the light is connected with divider resistance; The 3rd described switch S 3 and the 4th switch S 4 are connected with divider resistance.
Fig. 4 is existing isolated DC-DC micro power, comprises the switch element connected successively, voltage transformation unit and rectification unit; Usually such power supply is used for certain unit supply module in surface-mounted integrated circuit, and its input energy is less.Although there is rectification unit to exist, when voltage magnitude is less than normal, rectification unit can not improve the noise jamming of coil to transition waveform, to such an extent as to output waveform is unstable, unreliable.
Embodiment 1
Fig. 3 is that the present invention specifically implements to pass routine defeated oscillogram, power input 1 accesses original ripple, after coil component 2 windings, there is less electromagnetic noise perturbation in waveform, but, after being transformed into the output of coil component 2 secondary winding, there is larger noise disturbance in transition waveform 8, transition waveform 8 is latter half of is noise disturbance completely, and contrary with effective waveform 9 level parameters, forms the waveform 8 of similar trigonometric function band burr.If do not carry out noise reduction, will there is distortion greatly in output waveform.By input feedback timing unit to the first switch S 1, second switch S2 conducting, effective waveform 9 is exported.After certain hour, the first switch S 1, second switch S2 disconnect, the 3rd switch S 3, the 4th switch S 4 conducting, by coil component 2 secondary winding short circuit, transition waveform 8 rear portion is ended, and obtains complete effective waveform 9, after Schmidt's filter 4, output waveform is rebuild, complete DC-DC transmission.
Beneficial effect of the present invention: provide power supply input, outlet chamber frequency and phase matched, realizes synchronous or asynchronous transmission function; Reduce coil component to the noise of transition waveform, block distorted waveform, obtain complete, accurate, reliable DC-DC output waveform.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly belongs to those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (6)
1. a noise reduction type isolation type high frequency square wave DC-DC power source, it is characterized in that, comprise power input (1), a winding of power input (1) connecting coil device (2), the secondary winding of coil component (2) is connected with noise and reduces module (3), and noise reduces module (3) and is connected with Schmidt trigger (4).
2. a kind of noise reduction type isolation type high frequency square wave DC-DC power source according to claim 1, is characterized in that, described power input (1), comprises the first buffer register (6) in parallel and the second buffer register (7); Also comprise delayer (5), delayer (5) is connected with the second buffer register (7).
3. a kind of noise reduction type isolation type high frequency square wave DC-DC power source according to claim 1, it is characterized in that, described coil component (2), comprises miniature transformer.
4. a kind of noise reduction type isolation type high frequency square wave DC-DC power source according to claim 1, it is characterized in that, described noise reduces module (3), comprise the output loop for waveform reconstruction, output loop comprises first switch S 1 of connecting with coil component (1) secondary winding, Schmidt trigger (4), second switch S2;
Comprise the short-circuit loop for truncation noise, short-circuit loop comprises three switch S 3 in parallel with coil component (2) secondary winding, the 4th switch S 4 of connecting with the 3rd switch S 3.
5. a kind of noise reduction type isolation type high frequency square wave DC-DC power source according to claim 4, it is characterized in that, also comprise input feedback timing unit, input feedback timing unit comprises high level end connecting coil device (2) secondary winding and first comparator (11) of low level end connection divider resistance;
High level end connects divider resistance and second comparator (10) of the secondary winding of low level end connecting coil device (4);
S holds connection first comparator (11) output and the rest-set flip-flop (12) of R end connection second comparator (10) output;
Also comprise the monostable flipflop (14) held with rest-set flip-flop Q and be connected, monostable flipflop (14) controls the first switch S 1, second switch S2 by feedback loop, also by connecting inverter controlling the 3rd switch S 3, the 4th switch S 4.
6. a kind of noise reduction type isolation type high frequency square wave DC-DC power source according to claim 4, is characterized in that, described first S1 and second switch S2 that opens the light is connected with divider resistance; The 3rd described switch S 3 and the 4th switch S 4 are connected with divider resistance.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111257612A (en) * | 2020-01-17 | 2020-06-09 | 南京瑞控电气有限公司 | Isolation circuit for realizing linear pulse electric quantity based on electromagnetic sensor |
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| CN103906331A (en) * | 2012-12-29 | 2014-07-02 | 欧普照明股份有限公司 | Driving circuit of high intensity discharge lamp |
| CN204761291U (en) * | 2015-05-23 | 2015-11-11 | 成都众孚理想科技有限公司 | Noise reduces isolated high frequency square wave DC -DC power of type |
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| JPH07322601A (en) * | 1994-05-23 | 1995-12-08 | Hitachi Ltd | Switching regulator |
| CN1241839A (en) * | 1998-07-13 | 2000-01-19 | 郑曙明 | Double phase change inverter circuit |
| JP2006246550A (en) * | 2005-02-28 | 2006-09-14 | Shinano Kenshi Co Ltd | Drive unit of electromagnetic capacity type pump |
| CN101917811A (en) * | 2010-08-02 | 2010-12-15 | 西安新光明电子科技有限公司 | Anti-noise jamming high-side drive circuit |
| CN103906331A (en) * | 2012-12-29 | 2014-07-02 | 欧普照明股份有限公司 | Driving circuit of high intensity discharge lamp |
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| CN111257612A (en) * | 2020-01-17 | 2020-06-09 | 南京瑞控电气有限公司 | Isolation circuit for realizing linear pulse electric quantity based on electromagnetic sensor |
| CN111257612B (en) * | 2020-01-17 | 2022-02-25 | 南京瑞控电气有限公司 | Isolation circuit for realizing linear pulse electric quantity based on electromagnetic sensor |
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Inventor after: Wu Xianjun Inventor after: Qiu Nanyang Inventor after: Zou Yongbiao Inventor before: Wang Hai Inventor before: Li Guo |
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Effective date of registration: 20171218 Address after: 518000, Shenzhen, Guangdong, Baoan District Province, south Pu Road, South Po Road, Po ha three slope pit second industrial zone, A2 Applicant after: Shenzhen Flypower Technology Co., Ltd. Address before: 610041 Sichuan province Chengdu Tianfu four Street No. 66 Building 2 floor 8 No. 3 Applicant before: CHENGDU ZHONGFU IDEAL TECHNOLOGY CO., LTD. |
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