CN103151929A - Forward reset circuit suitable for low voltage input - Google Patents
Forward reset circuit suitable for low voltage input Download PDFInfo
- Publication number
- CN103151929A CN103151929A CN2013100942268A CN201310094226A CN103151929A CN 103151929 A CN103151929 A CN 103151929A CN 2013100942268 A CN2013100942268 A CN 2013100942268A CN 201310094226 A CN201310094226 A CN 201310094226A CN 103151929 A CN103151929 A CN 103151929A
- Authority
- CN
- China
- Prior art keywords
- reset circuit
- normal shock
- reset
- switching tube
- magnetic
- 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.)
- Pending
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The invention provides a forward reset circuit suitable for low voltage input. The forward reset circuit comprises a forward transformer and a switching tube, wherein the switching tube is connected with the forward transformer. The forward reset circuit also comprises a magnetic reset circuit which is used for resetting the forward transformer in each switching period. The forward reset circuit has the beneficial effects that the magnetic reset of the transformer is realized through a magnetic reset capacitor and a magnetic reset diode, and the energy consumption of a resonant capacitor in a resonant magnetic reset circuit is avoided; the conversion efficiency, the temperature rise property index and the like of a power supply are increased; and the circuit is simple, reliable, convenient and fast.
Description
Technical field
The present invention relates to reset circuit, relate in particular to a kind of normal shock reset circuit that is applicable to the low pressure input.
Background technology
Forward converter has the most widely in the middle low power field of switch power to be used, and have the plurality of advantages such as topology is simple, efficient is high, synchronous rectification is convenient, but it must carry out magnetic reset in each switch periods, otherwise can cause magnetic saturation.
Forward converter has many magnetic reset methods at present, as reset winding method, RCD method, active-clamp method, double tube positive exciting method and resonant reset etc.The reset winding mode need to increase a reset winding on former limit separately, and former limit switching tube need to bear the input voltage of 2 times, and is as bad in the reset winding coupling, and peak voltage is larger; R in the RCD repositioning can produce power loss, causes decrease in efficiency; Active-clamp is solution preferably, has realized soft switch, and is most effective, but complex structure, cost is also the highest; Double tube positive exciting method reliability is high, but needs 2 switching tubes and 2 diodes, and number of devices is maximum; Resonant reset utilizes former limit inductance and reset capacitance resonance, and it is higher that former limit switching tube bears voltage, and efficient is low.Various magnetic reset methods have pluses and minuses, and the occasion of using respectively is different.
Summary of the invention
In order to solve the problems of the prior art, the invention provides a kind of normal shock reset circuit that is applicable to the low pressure input.
The invention provides a kind of normal shock reset circuit that is applicable to the low pressure input, comprise normal shock transformer, switching tube, described switching tube is connected with described normal shock transformer, and this normal shock reset circuit also is included in the magnetic reset circuit that in each switch periods, described normal shock transformer is resetted.
As a further improvement on the present invention, described magnetic reset circuit comprises magnetic reset electric capacity and the magnetic reset diode that is connected with described magnetic reset electric capacity.
As a further improvement on the present invention, this normal shock reset circuit also comprises the parasitic capacitance of switching tube.
As a further improvement on the present invention, at the switching tube blocking interval, electric current passes through the magnetic reset diode to described magnetic reset capacitor charging when charging to the parasitic capacitance of switching tube.
As a further improvement on the present invention, this normal shock reset circuit also comprises output rectification unit, output LC filter circuit and load, and energy conversion and the transmission of power supply completed in described switching tube, described normal shock transformer, output rectification unit, output LC filter circuit and load.
As a further improvement on the present invention, described output rectification unit comprises rectifier diode and rectifier diode.
The invention has the beneficial effects as follows: the present invention has realized the magnetic reset of transformer by magnetic reset electric capacity and magnetic reset diode, avoided resonant capacitance energy consumption in resonance magnetic reset circuit, the conversion efficiency of power supply, temperature rise performance index etc. are improved, and circuit is simple and reliable convenient.
Description of drawings
Fig. 1 is the schematic diagram of one embodiment of the invention.
Fig. 2 is the schematic diagram of another embodiment of the present invention.
Embodiment
The invention discloses a kind of normal shock reset circuit that is applicable to the low pressure input, comprise normal shock transformer TX, switching tube Q1, described switching tube Q1 is connected with described normal shock transformer TX, and this normal shock reset circuit also is included in the magnetic reset circuit that in each switch periods, described normal shock transformer TX is resetted.
Described magnetic reset circuit comprises magnetic reset capacitor C 1 and the magnetic reset diode D1 that is connected with described magnetic reset capacitor C 1.
This normal shock reset circuit also comprises the parasitic capacitance Coss of switching tube Q1.
At switching tube Q1 blocking interval, electric current is given described magnetic reset capacitor C 1 charging by magnetic reset diode D1 to the parasitic capacitance Coss of switching tube Q1 charging the time.
This normal shock reset circuit also comprises output rectification unit, output LC filter circuit and load, and energy conversion and the transmission of power supply completed in described switching tube Q1, described normal shock transformer TX, output rectification unit, output LC filter circuit and load.
Described output rectification unit comprises rectifier diode D2 and rectifier diode D3.
Be two embodiment of the present invention as Fig. 1 and Fig. 2, when work, main power topology comprises main switch Q1, normal shock transformer TX, rectifier diode D2, rectifier diode D3, output LC filter circuit and load, mainly completes energy conversion, the transmission of power supply; The magnetic reset circuit has magnetic reset capacitor C 1 and magnetic reset diode D1 to realize, aligns violent change depressor TX and reset in each switch periods, prevents that it is saturated.
The range of application of this circuit is the middle low power forward converter of low pressure input.
The present invention has used magnetic reset capacitor C 1 and magnetic reset diode D1 to realize the magnetic reset of transformer, avoided resonant capacitance energy consumption in resonance magnetic reset circuit, the conversion efficiency of power supply, temperature rise performance index etc. are improved, and circuit is simple and reliable convenient, and higher practical commercial value is arranged.
In the unit switch periods, switching tube Q1 conduction period, TX transfers energy to secondary by the normal shock transformer; At switching tube Q1 blocking interval, because the existence of the former limit of normal shock transformer TX inductance, exciting current can not suddenly change, electric current to the parasitic capacitance Coss of switching tube Q1 charging the time by magnetic reset diode D1 to 1 charging of magnetic reset capacitor C, capacitance voltage rises to rapidly the transformer primary side electric current to zero.Parasitic capacitance Coss voltage is higher than input voltage at this moment, and to the input feedback energy, normal shock transformer TX primary current is reverse, completes degaussing by normal shock transformer TX, and this process lasts till that parasitic capacitance Coss voltage drop is to input voltage.Because the existence of magnetic reset capacitor C 1 has limited the too high of charging voltage, by regulating the size of magnetic reset capacitor C 1, the size that can change charging voltage is the shutoff voltage of switching tube Q1; Again because the existence of magnetic reset diode D1, avoided when switching tube Q1 opens releasing of energy in magnetic reset capacitor C 1, improved efficient.
From the above, this circuit synthesis the advantage of resonance normal shock and active clamp forward, avoided the loss of resonance normal shock and the complexity of active clamp forward, Project Realization is simple, cost is low, has higher commercial value.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (6)
1. one kind is applicable to the normal shock reset circuit that low pressure is inputted, it is characterized in that: comprise normal shock transformer (TX), switching tube (Q1), described switching tube (Q1) is connected with described normal shock transformer (TX), and this normal shock reset circuit also is included in the magnetic reset circuit that in each switch periods, described normal shock transformer (TX) is resetted.
2. normal shock reset circuit according to claim 1, it is characterized in that: described magnetic reset circuit comprises magnetic reset electric capacity (C1) and the magnetic reset diode (D1) that is connected with described magnetic reset electric capacity (C1).
3. normal shock reset circuit according to claim 2, it is characterized in that: this normal shock reset circuit also comprises the parasitic capacitance (Coss) of switching tube (Q1).
4. normal shock reset circuit according to claim 3, it is characterized in that: at switching tube (Q1) blocking interval, electric current charges to described magnetic reset electric capacity (C1) by magnetic reset diode (D1) when charging to the parasitic capacitance (Coss) of switching tube (Q1).
5. the described normal shock reset circuit of according to claim 1 to 4 any one, it is characterized in that: this normal shock reset circuit also comprises output rectification unit, output LC filter circuit and load, and energy conversion and the transmission of power supply completed in described switching tube (Q1), described normal shock transformer (TX), output rectification unit, output LC filter circuit and load.
6. normal shock reset circuit according to claim 5, it is characterized in that: described output rectification unit comprises rectifier diode (D2) and rectifier diode (D3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100942268A CN103151929A (en) | 2013-03-22 | 2013-03-22 | Forward reset circuit suitable for low voltage input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100942268A CN103151929A (en) | 2013-03-22 | 2013-03-22 | Forward reset circuit suitable for low voltage input |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103151929A true CN103151929A (en) | 2013-06-12 |
Family
ID=48549848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013100942268A Pending CN103151929A (en) | 2013-03-22 | 2013-03-22 | Forward reset circuit suitable for low voltage input |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103151929A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532363A (en) * | 2013-10-21 | 2014-01-22 | 国家电网公司 | Filter circuit separated-type microcomputer protection switching power supply plug |
| CN106571743A (en) * | 2016-09-13 | 2017-04-19 | 南昌大学 | Two-transistor forward switching power supply circuit |
| CN106849304A (en) * | 2017-03-30 | 2017-06-13 | 长沙云涯电子科技有限责任公司 | A kind of lead acid battery charge circuit |
| CN106849375A (en) * | 2017-04-21 | 2017-06-13 | 张雁 | A kind of contactlessly powered system of mobile vehicle |
| CN107222108A (en) * | 2017-06-09 | 2017-09-29 | 金陵科技学院 | A kind of active-clamp DC converter and its control method |
| CN107546985A (en) * | 2017-09-01 | 2018-01-05 | 大唐东北电力试验研究所有限公司 | Switching mode power supply transformer demagnetizing method and device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009278792A (en) * | 2008-05-15 | 2009-11-26 | Hitachi Communication Technologies Ltd | Switching power supply |
| CN103036440A (en) * | 2012-12-28 | 2013-04-10 | 深圳市航天新源科技有限公司 | Normal shock reset circuit for low voltage input |
-
2013
- 2013-03-22 CN CN2013100942268A patent/CN103151929A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009278792A (en) * | 2008-05-15 | 2009-11-26 | Hitachi Communication Technologies Ltd | Switching power supply |
| CN103036440A (en) * | 2012-12-28 | 2013-04-10 | 深圳市航天新源科技有限公司 | Normal shock reset circuit for low voltage input |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532363A (en) * | 2013-10-21 | 2014-01-22 | 国家电网公司 | Filter circuit separated-type microcomputer protection switching power supply plug |
| CN106571743A (en) * | 2016-09-13 | 2017-04-19 | 南昌大学 | Two-transistor forward switching power supply circuit |
| CN106571743B (en) * | 2016-09-13 | 2023-07-28 | 南昌大学 | Double-tube forward switch power supply circuit |
| CN106849304A (en) * | 2017-03-30 | 2017-06-13 | 长沙云涯电子科技有限责任公司 | A kind of lead acid battery charge circuit |
| CN106849375A (en) * | 2017-04-21 | 2017-06-13 | 张雁 | A kind of contactlessly powered system of mobile vehicle |
| CN107222108A (en) * | 2017-06-09 | 2017-09-29 | 金陵科技学院 | A kind of active-clamp DC converter and its control method |
| CN107546985A (en) * | 2017-09-01 | 2018-01-05 | 大唐东北电力试验研究所有限公司 | Switching mode power supply transformer demagnetizing method and device |
| CN107546985B (en) * | 2017-09-01 | 2023-10-20 | 大唐东北电力试验研究所有限公司 | Demagnetizing method for switching power supply transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9419531B2 (en) | Forward-flyback DC-DC converter using resonant LC output circuit | |
| CN103151929A (en) | Forward reset circuit suitable for low voltage input | |
| Lin et al. | New zero-voltage switching DC–DC converter for renewable energy conversion systems | |
| CN103490628B (en) | A kind of single-phase high-gain boost converter | |
| CN202750023U (en) | Current type single-stage isolation high-frequency switch power supply without alternating current / direct current (AC/DC) rectifier bridge | |
| CN105915060A (en) | Forward conversion circuit with secondary winding magnetic reset function and reset method thereof | |
| CN103731027A (en) | Single-stage step-down conversion circuit | |
| CN204271918U (en) | A kind of LLC circuit | |
| CN101917128B (en) | Rectifier circuit for realizing voltage clamp of rectifier tube by using double-power transformer | |
| CN204046411U (en) | Be applicable to single normal shock absorbing circuit of middle low power modular power source | |
| CN106655780B (en) | A kind of isolated electric power conversion apparatus | |
| CN202652054U (en) | Passive lossless snubber circuit suitable for single-tube flyback | |
| CN103036440B (en) | Normal shock reset circuit for low voltage input | |
| CN105958827A (en) | DC/DC converter topology circuit for high voltage switching power supply | |
| CN101860219B (en) | DC-DC converter | |
| CN109546849A (en) | Flyback converter active clamp circuit | |
| CN103151916A (en) | Low-ripple two-way soft switch DC-DC (direct current to direct current) circuit and uninterruptible power supply | |
| CN103078509B (en) | Soft switching interleaved DC converter with serial input and parallel output | |
| CN202750015U (en) | High-efficient low-cost push-pull-type direct current converter | |
| CN203326887U (en) | Frequency-multiplication full-bridge conversion circuit | |
| CN202475268U (en) | Pre-stage full bridge circuit of DC-DC converter | |
| KR20210150248A (en) | Forward converter with secondary lcd connected in series to realize excitation energy transfer | |
| CN205584026U (en) | From positive violent change parallel operation that restores to throne | |
| CN111682779A (en) | Secondary-side series-connection LCD (liquid crystal display) excitation energy transfer forward converter capable of restraining output energy backflow | |
| CN205195566U (en) | Double -barrelled clamper of harmless buffering is just swashing keeps apart converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20130612 |