CN109462338A - A kind of DC-DC converter - Google Patents
A kind of DC-DC converter Download PDFInfo
- Publication number
- CN109462338A CN109462338A CN201811251817.0A CN201811251817A CN109462338A CN 109462338 A CN109462338 A CN 109462338A CN 201811251817 A CN201811251817 A CN 201811251817A CN 109462338 A CN109462338 A CN 109462338A
- Authority
- CN
- China
- Prior art keywords
- module
- temperature
- transformer
- radiating
- switch part
- 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.)
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/085—Cooling by ambient air
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/406—Temperature sensor or protection
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to converters, specially a kind of DC-DC converter, including translation circuit, the translation circuit includes the input module and output module to be intercoupled by transformer, further include the temperature detecting module for detecting transformer and the first radiating module for radiating for transformer, the control module of the output of output the first radiating module of control according to temperature detecting module is provided between the temperature detecting module and the first radiating module；When the temperature of transformer is higher, control module controls the first radiating module according to the data that temperature detecting module detects and opens, and radiates for transformer, reduces the situation for causing converter impaired because the temperature of radiator is excessively high, prolongs the service life.
Description
Technical field
The present invention relates to converters, more particularly, to a kind of DC-DC converter.
Background technique
The appearance of synchronous rectification improves the efficiency of DC-DC converter, and notification number is the middle promulgated by the State Council of CN101860219A
It is bright to disclose a kind of DC-DC converter, including input unit and pass through transformer coupled output section；Input unit includes and transformer
The third metal-oxide-semiconductor of the magnetic reset circuit of primary side parallel coupled and its drain electrode and transformer primary side series coupled, third metal-oxide-semiconductor
Source electrode is coupled to ground；Output section includes the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 4th metal-oxide-semiconductor, diode, the first auxiliary winding, second
Auxiliary winding, filter inductance and filter capacitor.
The advantages of technical solution of foregoing invention is, the first auxiliary winding and the second auxiliary winding can with time-sharing multiplex,
The circle number that its winding can be compressed, reduces its volume；In addition, since the first metal-oxide-semiconductor is lower than the grid voltage of the second metal-oxide-semiconductor,
Further improve its reliability.
But converter is in the process of work, the calorific value of transformer is larger, and existing influences converter service life
Situation.
Summary of the invention
The DC-DC converter that the object of the present invention is to provide a kind of to radiate to it when transformer temperature is excessively high.
Above-mentioned purpose of the invention has the technical scheme that
A kind of DC-DC converter, including translation circuit, the translation circuit include the input module to be intercoupled by transformer
And output module, it further include the temperature detecting module for detecting transformer and the first radiating mould for radiating for transformer
Block is provided with according to the first heat dissipation of the output of temperature detecting module control between the temperature detecting module and the first radiating module
The control module of the output of module.
By using above-mentioned technical proposal, when the temperature of transformer is higher, control module is examined according to temperature detecting module
The data measured control the first radiating module and open, and radiate for transformer, and reduction causes to convert because the temperature of radiator is excessively high
The impaired situation of device, prolongs the service life.
The present invention is further arranged to: the control module includes first comparator and first switch part, first ratio
The output valve of temperature detecting module is compared with the first temperature preset value compared with device, and first switch is controlled according to comparison result
The on-off of part, first switch part are connected to the power circuit of the first radiating module.
By using above-mentioned technical proposal, when the temperature of transformer is higher, the output valve of temperature detecting module is greater than the
One temperature preset value, first comparator control the conducting of first switch part, the power circuit of the first radiating module are connected to, to transformer
It radiates.
The present invention is further arranged to: first radiating module is in series with first resistor, the first resistor and first
Switch member is in parallel.
By using above-mentioned technical proposal, before the conducting of first switch part, the first radiating module connects electricity through first resistor
Source is simultaneously opened, and is radiated for transformer, and after the conducting of second switch part, second resistance and first resistor are in parallel, and total resistance decrease increases
The operating current of big first radiating module improves heat dissipation effect to increase the power output of the first radiating module.
The present invention is further arranged to: the control module further include with the concatenated second resistance of first switch part, it is described
The quantity of first comparator, first switch part and second resistance is all larger than 1 and corresponds, the first comparator that is serially connected and
Second resistance composition adjusts unit, and adjusting unit is parallel with one another, and the first temperature preset value of the different first comparators is not
Together.
By using above-mentioned technical proposal, during the temperature of transformer gradually rises, corresponding first temperature is default
The first comparator of value from low to high sequentially turns on, parallel with one another between second resistance, so that total resistance decrease, increases first and dissipate
The operating current of thermal modules improves heat dissipation effect to increase the power output of the first radiating module.
The present invention is further arranged to: the first temperature preset value of the different first comparators is arranged in equal difference.
By using above-mentioned technical proposal, the second resistance of different number is set mutually simultaneously in certain temperature range
Connection improves heat dissipation effect.
The present invention is further arranged to: the resistance value of several second resistances is identical.
By using above-mentioned technical proposal, so that smoother to the adjusting of the operating current of the first radiating module, extend the
The service life of one radiating module.
The present invention is further arranged to: the control module further includes the second comparator and second switch part, and described second
Switch member is in series with the second radiating module, and second comparator is by the output valve of temperature detecting module and second temperature preset value
It is compared, and controls the on-off of second switch part according to comparison result, it is pre- that the second temperature preset value is greater than the first temperature
If value.
By using above-mentioned technical proposal, transformer when the temperature is excessively high, the second comparator control second switch part is led
It is logical, it is connected to the power circuit of the second radiator, reinforces heat dissipation effect.
The present invention is further arranged to: the temperature detecting module includes temperature sensor and amplifier, the amplifier
The output valve of temperature sensor is amplified.
By using above-mentioned technical proposal, amplifier amplifies the output of temperature sensor, improves detection accuracy.
The present invention is further arranged to: first radiating module is radiator fan.
By using above-mentioned technical proposal, accelerates the air flow rate at transformer, radiate to transformer.
In conclusion advantageous effects of the invention are as follows:
1. opening the first radiating module when the temperature of transformer is higher, radiating to transformer；
2. being gradually increased the power output of the first radiating module when the constant temperature of transformer increases, heat dissipation effect is improved；
3. transformer when the temperature is excessively high, open the second radiator, reinforce heat dissipation effect.
Detailed description of the invention
Fig. 1 is the schematic illustration of the present embodiment；
Fig. 2 is the schematic illustration of translation circuit in the present embodiment.
Appended drawing reference: 1, translation circuit；2, transformer；3, input module；4, output module；5, the first radiating module；6,
First comparator；7, first switch part；8, first resistor；9, second resistance；10, the second comparator；11, second switch part；12,
Temperature sensor；13, amplifier；14, magnetic reset circuit；15, the first metal-oxide-semiconductor；16, the second metal-oxide-semiconductor；17, third metal-oxide-semiconductor；18,
4th metal-oxide-semiconductor；19, the first auxiliary winding；20, the second auxiliary winding；21, the second radiating module.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
It referring to Fig.1, is a kind of DC-DC converter disclosed by the invention, including translation circuit 1, temperature detecting module, first
Radiating module 5 and the second radiating module 21, translation circuit 1 include the input module 3 to be intercoupled by transformer 2 and output mould
Block 4, temperature detecting module are used to detect the temperature of transformer 2, and the first radiating module 5 and the second radiating module 21 are radiation air
Fan, for radiating to transformer 2.
Temperature detecting module includes temperature sensor 12 and amplifier 13, temperature sensor 12 to the temperature of transformer 2 into
Row detection, output voltage increases the raising of the temperature of transformer 2, and its output signal is amplified through amplifier 13,
The output end of amplifier 13 is electrically connected with 3 first comparators 6, and the non-inverting input terminal of first comparator 6 is defeated with amplifier 13
Outlet connection, the inverting input terminal of 3 first comparators 6 receives respectively for offer the first temperature preset value Vref11,
The preset signals of Vref12 and Vref13, and the first temperature preset value of 3 first comparators 6 is arranged in equal difference, is amplifying
When the output valve of device 13 is greater than the first temperature preset value, corresponding first comparator 6 exports high level signal.
First radiating module 5 connects power supply VCC through first resistor 8, and the output end of each first comparator 6 is electrically connected with
First switch part 7, first switch part 7 are NMOS tube, and the grid of first switch part 7 connects corresponding first comparator 6, and drain electrode is electrically connected
It is connected to power supply VCC, source electrode is electrically connected between first resistor 8 and the first radiating module 5 through second resistance 9, and corresponding first opens
The composition of second resistance 9 for closing part 7 adjusts unit, parallel with one another between 3 adjustings unit and first resistors 8, and first resistor 8
It is consistent with the resistance value of second resistance 9.When first comparator 6 exports high level signal, first switch part 7 is connected, and corresponding the
Two resistance 9 are in parallel with first resistor 8, so that total resistance decrease, and the first switch part more than 7 be connected, total resistance value are lower.
The output end of amplifier 13 is also electrically connected with the second comparator 10, the non-inverting input terminal electrical connection of the second comparator 10
In amplifier 13, inverting input terminal is received for providing the preset signals of second temperature preset value Vref2, and second temperature is pre-
If value is greater than the first temperature preset value, when the output valve of amplifier 13 is greater than second temperature preset value, the second comparator 10 is defeated
High level signal out.
The output end of second comparator 10 is electrically connected with second switch part 11, and second switch part 11 is NMOS tube, and second opens
The grid for closing part 11 is electrically connected to the second comparator 10, drain electrode connection power supply VCC, and source electrode is electrically connected the second radiating module 21,
When second comparator 10 exports high level signal, second switch part 11 is connected, and the second radiating module 21 is opened.
Combined with Figure 1 and Figure 2, input module 3 include the magnetic reset circuit 14 in parallel with the primary side of transformer 2 and its drain electrode with
The concatenated third metal-oxide-semiconductor 17 of the primary side of transformer 2；Output module 4 includes the first metal-oxide-semiconductor 15, the second metal-oxide-semiconductor 16, the 4th metal-oxide-semiconductor
18, diode D1, the first auxiliary winding 19, the second auxiliary winding 20, filter inductance L and filter capacitor C.
First auxiliary winding 19 and the second auxiliary winding 20 connect and are coupled with the primary side of transformer 2；First metal-oxide-semiconductor 15
Drain electrode and transformer 2 secondary side coupling, the grid grid with 20 one end of the second auxiliary winding, the 4th metal-oxide-semiconductor 18 respectively
Coupled with the cathode of diode D1, source electrode respectively with the source electrode of the second metal-oxide-semiconductor 16, one end of filter capacitor C, the 4th metal-oxide-semiconductor
The anode coupling of 18 source electrode and diode D1；Second metal-oxide-semiconductor 16 drain electrode respectively with the secondary side of transformer 2 and filter inductance L
Coupling, grid are coupled with the first auxiliary winding 19；The other end of filter capacitor C is coupled with filter inductance L；4th metal-oxide-semiconductor 18
Drain electrode be coupled respectively with the first auxiliary winding 19 and the second auxiliary winding 20.
Specific work process: switching circuit at work, when the positive synonymous end voltage of auxiliary winding be higher than negative Same Name of Ends when,
The grid voltage of 4th metal-oxide-semiconductor 18 is higher than source voltage, and source electrode and drain electrode communicates, and the tap of auxiliary winding is by the 4th metal-oxide-semiconductor 18
To ground, diode D1 reversely ends clamper.The high voltage of auxiliary winding positive synonymous end is powered to the grid of the first metal-oxide-semiconductor 15, is made
The conducting of its source electrode and drain electrode；The grid voltage of second metal-oxide-semiconductor 16 is negative voltage, source electrode and drain electrode cut-off.
It is cut between the source electrode and drain electrode of the 4th metal-oxide-semiconductor 18 when the positive synonymous end voltage of auxiliary winding is lower than negative Same Name of Ends
Only, the positive synonymous end of auxiliary winding is ended by diode D1 clamper to ground, between the source electrode and drain electrode of the first metal-oxide-semiconductor 15；Auxiliary
The negative Same Name of Ends of winding is powered to the grid of the second metal-oxide-semiconductor 16, its source electrode and drain electrode is connected.
Above procedure constitutes a complete switch periods, and the gate-source voltage of the second metal-oxide-semiconductor 16 is two groups of auxiliary windings
Voltage is superimposed, to solve the problems, such as that the driving voltage of the second metal-oxide-semiconductor 16 is insufficient；First auxiliary winding 19 and the second auxiliary around
Group 20 can further be compressed the circle number of its winding, be reduced its volume with time-sharing multiplex.
When starting converter, the first radiating module 5 is opened, and is radiated for transformer 2, is increased in the temperature of transformer 2
When the output valve of temperature detecting module is greater than the smallest first temperature preset value, corresponding second resistance 9 and first resistor 8 are simultaneously
Connection, so that total resistance decrease of the power circuit of the first radiating module 5, the power output of the first radiating module 5 increases, and improves heat dissipation effect
Fruit.
When the constant temperature of transformer 2 increases, more second resistances 9 are in parallel with first resistor 8, so that the first heat dissipation
Total resistance value of the power circuit of module 5 further declines, and the power output of the first radiating module 5 increases, and further increases heat dissipation effect.
When making the output valve of temperature detecting module be greater than second temperature preset value when the temperature of transformer 2 is excessively high, the
Two radiating modules 21 are opened, and are radiated jointly to transformer 2 with the first radiating module 5, and heat dissipation effect is improved, and extend converter
Service life.
The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this
Range, therefore: the equivalence changes that all structures under this invention, shape, principle are done, should all be covered by protection scope of the present invention it
It is interior.
Claims (9)
1. a kind of DC-DC converter, including translation circuit (1), the translation circuit (1) includes passing through transformer (2) phase mutual coupling
The input module (3) and output module (4) of conjunction, it is characterised in that: further include the temperature detecting module for detecting transformer (2)
With for for transformer (2) heat dissipation the first radiating module (5), between the temperature detecting module and the first radiating module (5)
It is provided with the control module that the output of the first radiating module (5) is controlled according to the output of temperature detecting module.
2. a kind of DC-DC converter according to claim 1, it is characterised in that: the control module compares including first
Device (6) and first switch part (7), the first comparator (6) is by the output valve of temperature detecting module and the first temperature preset value
It is compared, and controls the on-off of first switch part (7) according to comparison result, first switch part (7) is connected to the first radiating mould
The power circuit of block (5).
3. a kind of DC-DC converter according to claim 2, it is characterised in that: first radiating module (5) is in series with
First resistor (8), the first resistor (8) are in parallel with first switch part (7).
4. a kind of DC-DC converter according to claim 2, it is characterised in that: the control module further includes with first
Switch member (7) concatenated second resistance (9), the first comparator (6), first switch part (7) and second resistance (9) quantity
It is all larger than 1 and corresponds, first comparator (6) and second resistance (9) composition being serially connected adjust unit, adjust unit phase
Mutually in parallel, the first temperature preset value of the different first comparators (6) is different.
5. a kind of DC-DC converter according to claim 4, it is characterised in that: the different first comparators (6)
First temperature preset value is arranged in equal difference.
6. a kind of DC-DC converter according to claim 4, it is characterised in that: the resistance value of several second resistances (9)
It is identical.
7. a kind of DC-DC converter according to claim 2, it is characterised in that: the control module further includes the second ratio
Compared with device (10) and second switch part (11), the second switch part (11) is in series with the second radiating module (21), second ratio
The output valve of temperature detecting module is compared with second temperature preset value compared with device (10), and according to comparison result control second
The on-off of switch member (11), the second temperature preset value are greater than the first temperature preset value.
8. a kind of DC-DC converter according to claim 1, it is characterised in that: the temperature detecting module includes temperature
Sensor (12) and amplifier (13), the amplifier (13) amplify the output valve of temperature sensor (12).
9. a kind of DC-DC converter according to claim 1, it is characterised in that: first radiating module (5) is heat dissipation
Fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811251817.0A CN109462338A (en) | 2018-10-25 | 2018-10-25 | A kind of DC-DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811251817.0A CN109462338A (en) | 2018-10-25 | 2018-10-25 | A kind of DC-DC converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109462338A true CN109462338A (en) | 2019-03-12 |
Family
ID=65608392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811251817.0A Pending CN109462338A (en) | 2018-10-25 | 2018-10-25 | A kind of DC-DC converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109462338A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109752668A (en) * | 2018-12-06 | 2019-05-14 | 兰州空间技术物理研究所 | A kind of negative pressure output DC/DC converter with positive pressure telemetering |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090072984A1 (en) * | 2007-09-14 | 2009-03-19 | Wing Ling Cheng | Health monitoring for power converter components |
| CN101404376A (en) * | 2008-10-27 | 2009-04-08 | 无锡市中兴光电子技术有限公司 | Automatic temperature control apparatus of pump laser for ASE broadband light source |
| CN101860219A (en) * | 2010-05-25 | 2010-10-13 | 深圳市核达中远通电源技术有限公司 | DC-DC converter |
| CN203685630U (en) * | 2013-09-03 | 2014-07-02 | 深圳市科曼医疗设备有限公司 | Automatic temperature control fan speed control system |
| CN203747395U (en) * | 2014-01-30 | 2014-07-30 | 杰华特微电子（杭州）有限公司 | Temperature protection circuit applied to LED current ripple eliminating circuit |
| CN105511520A (en) * | 2016-01-15 | 2016-04-20 | 中山芯达电子科技有限公司 | Automatic heat radiation protection circuit |
| CN205755246U (en) * | 2016-06-29 | 2016-11-30 | 北京菱拓电源设备有限公司 | A kind of AC DC power module |
| CN206162351U (en) * | 2016-09-21 | 2017-05-10 | 中国长城计算机深圳股份有限公司 | Computer and supplementary constant temperature circuit of heat dissipation thereof |
-
2018
- 2018-10-25 CN CN201811251817.0A patent/CN109462338A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090072984A1 (en) * | 2007-09-14 | 2009-03-19 | Wing Ling Cheng | Health monitoring for power converter components |
| CN101404376A (en) * | 2008-10-27 | 2009-04-08 | 无锡市中兴光电子技术有限公司 | Automatic temperature control apparatus of pump laser for ASE broadband light source |
| CN101860219A (en) * | 2010-05-25 | 2010-10-13 | 深圳市核达中远通电源技术有限公司 | DC-DC converter |
| CN203685630U (en) * | 2013-09-03 | 2014-07-02 | 深圳市科曼医疗设备有限公司 | Automatic temperature control fan speed control system |
| CN203747395U (en) * | 2014-01-30 | 2014-07-30 | 杰华特微电子（杭州）有限公司 | Temperature protection circuit applied to LED current ripple eliminating circuit |
| CN105511520A (en) * | 2016-01-15 | 2016-04-20 | 中山芯达电子科技有限公司 | Automatic heat radiation protection circuit |
| CN205755246U (en) * | 2016-06-29 | 2016-11-30 | 北京菱拓电源设备有限公司 | A kind of AC DC power module |
| CN206162351U (en) * | 2016-09-21 | 2017-05-10 | 中国长城计算机深圳股份有限公司 | Computer and supplementary constant temperature circuit of heat dissipation thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109752668A (en) * | 2018-12-06 | 2019-05-14 | 兰州空间技术物理研究所 | A kind of negative pressure output DC/DC converter with positive pressure telemetering |
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Application publication date: 20190312 |
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