CN107317465A - Driving voltage adaptive circuit and control method - Google Patents
Driving voltage adaptive circuit and control method Download PDFInfo
- Publication number
- CN107317465A CN107317465A CN201710561963.2A CN201710561963A CN107317465A CN 107317465 A CN107317465 A CN 107317465A CN 201710561963 A CN201710561963 A CN 201710561963A CN 107317465 A CN107317465 A CN 107317465A
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- Prior art keywords
- winding
- current
- driving voltage
- power supply
- switch
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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- 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
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention relates to a kind of driving voltage adaptive circuit, for improving light-load efficiency in DC to DC converter.The driving voltage adaptive circuit includes accessory power supply, and accessory power supply is provided with tap, and the winding of accessory power supply is divided into the first winding and the second winding by tap.Wherein, the second winding parallel fault control unit, fault control unit detection output current, and when output current is less than current threshold, make the second short circuit in winding；When output current is higher than current threshold, the first winding is set to keep connecting with the second winding.Above-mentioned driving voltage adaptive circuit economization falls the loss that linear voltage regulator is brought, and improves efficiency of the power supply in underloading；The control of its secondary circuit is simple, and the outer member used is few, saves cost.
Description
Technical field
The present invention relates to DC-to-dc converter field, more particularly to a kind of driving voltage adaptive circuit and control
Method.
Background technology
In DC-to-dc converter, current sensor circuit is used for the electric current for sensing power inverter, and produces with being somebody's turn to do
Sense the driving voltage (Vbias) of current in proportion.The Vbias is supplied to driver as operating voltage, for driving switch
And grid.
Vbias amplitude typically adjusts Vbias according to sensing curent change using linear voltage regulator.In low current,
Use low Vbias driving switch and grid；When a current increases, Vbias amplitude also accordingly increases.However, when Vbias inputs
Output drop is bigger, and the product of linear voltage regulator is bigger to be lost, so as to cause overall efficiency to reduce.
The content of the invention
Based on this, it is necessary to during for regulation Vbias, there is provided one for the problem of light-load efficiency is low in DC-to-dc converter
Plant driving voltage adaptive circuit and control method.
A kind of driving voltage adaptive circuit, for improving light-load efficiency in DC-to-dc converter, including accessory power supply
Transformation, and accessory power supply is provided with tap, the winding of accessory power supply is divided into the first winding and the second winding by tap；Second around
Group parallel connection short circuit control unit, fault control unit detection output current, and when output current is less than current threshold, make described
Second short circuit in winding, when output current is higher than current threshold, makes first winding keep connecting with the second winding.
In one of the embodiments, fault control unit includes current switch, the first fly-wheel diode and the second afterflow
Diode；Current switch is connected with second fly-wheel diode；First fly-wheel diode connects the tap, and continues with second
Flow diodes in parallel.
In one of the embodiments, current switch connecting valve control unit, switch control unit includes current detecting
Circuit and ON-OFF control circuit, and current detection circuit connecting valve control circuit；Current detection circuit detection output current
Size, and input to switch control unit；ON-OFF control circuit controls closing for the current switch according to the size of output current
Close or open.
In one of the embodiments, when output current is higher than current threshold, current switch closure, the first fly-wheel diode
Be not turned on, the conducting of the second fly-wheel diode, the first winding and the second windings in series are simultaneously connected the second fly-wheel diode；Output current
During less than current threshold, current switch is opened, and the conducting of the first fly-wheel diode, the second fly-wheel diode are not turned on, the second winding
It is short-circuited, and the first winding connects the first fly-wheel diode.
In one of the embodiments, tap is located at the optional position except winding two-end-point.
In one of the embodiments, the first winding two ends parallel filtering electric capacity.
In one of the embodiments, accessory power supply also includes power supply, main switch, first winding and secondary winding；Power supply
For providing input voltage；Input voltage is inputted to first winding by main switch, through first winding and secondary winding, will be inputted
Outputting drive voltage after voltage is raised or reduced.
In one of the embodiments, accessory power supply connection main power source, and the outputting drive voltage is supplied to main electricity
Source.
A kind of driving voltage self-adaptation control method, including：
Detect output current size；
Judge whether output current is more than current threshold, if so, then control electric current switch is closed, otherwise control electric current is switched
Open；
With the closure or opening according to current switch, corresponding accessory power supply winding segments are selected；
According to accessory power supply winding segments, corresponding driving voltage is exported.
In one of the embodiments, according to the closure or opening of current switch, corresponding accessory power supply winding segments are selected
The step of include：
When current switch is closed, accessory power supply accesses long winding segments；
When current switch is opened, accessory power supply accesses short winding segments.
Above-mentioned driving voltage adaptive circuit, it is electric to supply different drivings by adding tap in auxiliary power circuit
Press, then controlling switch selects the switch and grid in corresponding driving voltage driving main power source.This going offline property of circuit economization is steady
The loss that depressor is brought, improves efficiency of the power supply in underloading；The control of its secondary circuit is simple, and the outer member used is few,
Save cost.
Brief description of the drawings
Fig. 1 is the operational module figure of the driving voltage adaptive circuit of an embodiment；
Fig. 2 is the driving voltage adaptive circuit schematic diagram of an embodiment；
Fig. 3 is the current detection circuit figure of an embodiment；
Fig. 4 is the ON-OFF control circuit figure of an embodiment；
Fig. 5 is the driving voltage self-adaptation control method flow chart of an embodiment.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.On the contrary, the purpose that these embodiments are provided be make to disclose present disclosure it is more thorough complete
Face.
Fig. 1 is the operational module figure of the driving voltage adaptive circuit of an embodiment.The driving voltage adaptive circuit 100
Including accessory power supply 110 and fault control unit 120.Accessory power supply 110 is provided with tap P, and tap P is by accessory power supply 110
Winding is divided into the first winding L1 and the second winding L2.Wherein, the second winding L2 parallel connection short circuits control unit 120, fault control
The detection output current of unit 120 (connection of fault control unit and output current not shown in figure), and be less than in output current
During current threshold, the second winding L2 short circuits, when output current is higher than current threshold, make the first winding L1 and second
Winding L2 keeps series connection.
In Fig. 1, tap P can be located at any point in transformer secondary output winding in addition to two ends, according to residing for tap P
Transformer secondary output winding, can be divided into that length is different or two groups of windings of identical by diverse location, the first winding L1 and the
Two winding L2.Wherein, the second winding L2 fault control unit 120 in parallel, fault control unit 120 is according to pre-setting
Current threshold I1 controls the second winding L2 short circuits or the second winding L2 and the first winding L1 holding is connected.Specifically, it is short
Output current size in the detection load of road control unit 120, if output current is less than current threshold I1, judges load running
In light condition, the now control of fault control unit 120 second winding L2 short circuits, driving voltage adaptive circuit 100 provides one
Individual relatively low driving voltage Vbias is to main power source；If output current is higher than current threshold I1, judge load running in heavily loaded shape
State, the second winding L2 of now fault control unit control connects with the first winding L1, and driving voltage adaptive circuit 100 provides one
Individual higher driving voltage Vbias is to main power source.
It can be seen that, the change of output current feeds back to fault control unit, and fault control unit is according to output current
Situation of change controls the winding length of accessory power supply, and then controls outputting drive voltage Vbias size.Specifically, export
Electric current becomes big, selects long winding, outputting drive voltage Vbias amplitude increase；Output current diminishes, and selects short winding, output
Driving voltage Vbias amplitude reduces.
As shown in Fig. 2 being the driving voltage adaptive circuit schematic diagram of an embodiment.In the present embodiment, only with tap
Illustrated exemplified by the center of transformer secondary output winding.For convenience of description, centered on the tap in the present embodiment is named
Tap P0.Circuit shown in Fig. 2 includes the driving voltage adaptive circuit 100 of the present embodiment, and driving voltage adaptive circuit 100 is wrapped
Include accessory power supply 110 and fault control unit 120.
Accessory power supply 110 includes armature winding N1, secondary windings N2 and magnetic core T.Wherein, secondary windings N2 is provided with center
Secondary windings N2 is divided into two groups long degree identical coil windings by tap P0, centre cap P0：First winding L3 and second around
Group L4.
Fault control unit 120 includes the first sustained diode 1, the second sustained diode 2 and current switch Q1.
In addition, the output end of driving voltage adaptive circuit 100 also one filter capacitor C of parallel connection.
Specifically, the first sustained diode of centre cap P0 connections 1, the second winding L4 one end connection centre cap P0,
The other end connects current switch Q1 and the second sustained diode 2.Wherein, current switch Q1 and the second sustained diode 2 are connected；
First sustained diode 1 D2 in parallel with the second fly-wheel diode.Further, current switch Q1 connecting valves control circuit, is opened
Q1 closure or opening can be switched according to the size control electric current of output current by closing control circuit.
Specifically, when ON-OFF control circuit detects output current higher than current threshold, current switch Q1 closures, first
Sustained diode 1 is not turned on, the second sustained diode 2 is turned on, and the first winding L3 connects with the second winding L4 and is connected
Two sustained diodes 2, driving voltage adaptive circuit 100 exports a higher drive Vbias.
When ON-OFF control circuit detects output current less than current threshold, current switch Q1 is opened, the first afterflow two
Pole pipe D1 conductings, the second sustained diode 2 are not turned on, and the second winding L4 is short-circuited, the pole of first the first afterflow of winding L3 connections two
Pipe D1, driving voltage adaptive circuit 100 exports one compared with low driving voltage Vbias.
Further, as shown in figure 3, for detect output current current detection circuit include current detecting inductance L5,
Current-limiting resistance R5 and R6, operational amplifier O.Wherein, current detecting inductance L5 is used for the size for detecting output current, output current
Inputted after amplifying through operational amplifier O to ON-OFF control circuit.
Further, as shown in figure 4, ON-OFF control circuit include triode Q2, current switch Q1 and current-limiting resistance R1,
R2, R3 and R4.When output current is more than current threshold, triode Q2 conductings, current switch Q1 closures；When output current is less than
During current threshold, triode Q2 is disconnected, and current switch Q1 is opened.
Based on identical inventive concept, there is provided a kind of driving voltage self-adaptation control method.
Fig. 5 is the driving voltage self-adaptation control method of an embodiment, and this method comprises the following steps：
Step S100：Detect output current size.In current detection circuit, output current is flowed through into detection resistance L5,
And current signal is amplified by output by operational amplifier O.
Step S200：Judge whether output current is more than current threshold, if so, then control electric current switch closure, is otherwise controlled
Current switch processed is opened.Triode Q2 and current switch Q1 are provided with ON-OFF control circuit, when output current is more than electric current
During threshold value, triode Q2 conductings, current switch Q1 gate is pulled low, so that current switch Q1 is closed；When output current is less than
During current threshold, triode Q2 is not turned on, and current switch Q1 is opened.
Step S300：With the closure or opening according to current switch, corresponding accessory power supply winding segments are selected.
Step S400：According to accessory power supply winding segments, corresponding driving voltage is exported.The corresponding output driving of long winding segments
Voltage is high voltage, and the corresponding outputting drive voltage of short winding segments is low-voltage.It is normal higher than main power source that high voltage refers to magnitude of voltage
Required driving voltage value during work, low-voltage driving voltage value required when referring to magnitude of voltage less than main power source normal work.
In one of the embodiments, step S300 includes：When current switch is closed, accessory power supply accesses long winding
Section；When current switch is opened, accessory power supply accesses short winding segments.Accessory power supply has a long winding segments and short winding segments, it is long around
Group section is the intrinsic length of secondary windings, i.e. the first winding L1 length adds the second winding L2 length；Short winding segments are first
Winding segments L1.In addition, long winding segments connect the second sustained diode 2, short winding segments connect the first sustained diode 1.Work as electricity
During stream switch Q1 closures, the second sustained diode 2 is turned on, and the first sustained diode 1 is not turned on, and accessory power supply accesses long winding
Section；When current switch Q1 is opened, the second sustained diode 2 is not turned on, and the first sustained diode 1 is turned on, and accessory power supply connects
Enter short winding segments.
Above-mentioned driving voltage adaptive circuit, it is electric to supply different drivings by adding tap in accessory power supply winding
Press, then controlling switch selects the switch and grid in corresponding driving voltage driving main power source.This going offline property of circuit economization is steady
The loss that depressor is brought, improves efficiency of the power supply in underloading；The control of its secondary circuit is simple, and the outer member used is few,
Save cost.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of driving voltage adaptive circuit, for improving light-load efficiency in DC-to-dc converter, including accessory power supply,
Characterized in that, the accessory power supply is provided with tap, the winding of accessory power supply is divided into the first winding and by the tap
Two windings；The second winding parallel fault control unit, the fault control unit detects output current, and in the output
When electric current is less than current threshold, make second short circuit in winding, when the output current is higher than current threshold, make described first
Winding keeps connecting with the second winding.
2. driving voltage adaptive circuit according to claim 1, it is characterised in that the fault control unit includes electricity
Stream switch, the first fly-wheel diode and the second fly-wheel diode；The current switch is connected with second fly-wheel diode；Institute
State the first fly-wheel diode and connect the tap, and it is in parallel with the second fly-wheel diode.
3. driving voltage adaptive circuit according to claim 2, it is characterised in that the current switch connecting valve control
Unit processed, the switch control unit includes current detection circuit and ON-OFF control circuit, and current detection circuit connecting valve
Control circuit；The current detection circuit detects the size of output current, and inputs to switch control unit；The switch control
Circuit controls the closure or opening of the current switch according to the size of output current.
4. driving voltage adaptive circuit according to claim 3, it is characterised in that
When the output current is higher than current threshold, current switch closure, first fly-wheel diode is not turned on, second
Fly-wheel diode is turned on, and first winding and the second windings in series are simultaneously connected the second fly-wheel diode；
When the output current is less than current threshold, the current switch is opened, and the first fly-wheel diode conducting, second continue
Stream diode is not turned on, and second winding is short-circuited, and the first winding connects the first fly-wheel diode.
5. driving voltage adaptive circuit according to claim 1, it is characterised in that the tap is located at winding two-end-point
Except optional position.
6. driving voltage adaptive circuit according to claim 1, it is characterised in that the first winding two ends parallel connection filter
Ripple electric capacity.
7. driving voltage adaptive circuit according to claim 1, it is characterised in that the accessory power supply also includes electricity
Source, main switch, first winding and secondary winding；The power supply is used to provide input voltage；The input voltage passes through main switch
Input is to first winding, through first winding and secondary winding, by outputting drive voltage after input voltage rise or reduction.
8. driving voltage adaptive circuit according to claim 7, it is characterised in that the accessory power supply connects main electricity
Source, and the outputting drive voltage is supplied to main power source.
9. a kind of driving voltage self-adaptation control method, including：
Detect output current size；
Judge whether output current is more than current threshold, if so, then control electric current switch is closed, otherwise control electric current switch is beaten
Open；
With the closure or opening according to current switch, corresponding accessory power supply winding segments are selected；
According to accessory power supply winding segments, corresponding driving voltage is exported.
10. driving voltage self-adaptation control method according to claim 9, it is characterised in that described according to current switch
Closure or opening, select corresponding accessory power supply winding segments the step of include：
When current switch is closed, accessory power supply accesses long winding segments；
When current switch is opened, accessory power supply accesses short winding segments.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710561963.2A CN107317465A (en) | 2017-07-11 | 2017-07-11 | Driving voltage adaptive circuit and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710561963.2A CN107317465A (en) | 2017-07-11 | 2017-07-11 | Driving voltage adaptive circuit and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107317465A true CN107317465A (en) | 2017-11-03 |
Family
ID=60179271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710561963.2A Pending CN107317465A (en) | 2017-07-11 | 2017-07-11 | Driving voltage adaptive circuit and control method |
Country Status (1)
| Country | Link |
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| CN (1) | CN107317465A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412421A (en) * | 2018-11-13 | 2019-03-01 | 广州金升阳科技有限公司 | A kind of parallel operation circuit |
| CN110445356A (en) * | 2019-08-15 | 2019-11-12 | 合肥联宝信息技术有限公司 | A kind of DC-DC converting means and method |
| CN112491252A (en) * | 2020-12-30 | 2021-03-12 | 深圳市永联科技股份有限公司 | Driving method and circuit for improving reliability of SIC MOSFET |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080007241A1 (en) * | 2006-07-07 | 2008-01-10 | Intersil Americas Inc. | Load compensated switching regulator |
| CN101588139A (en) * | 2008-05-21 | 2009-11-25 | 弗莱克斯电子有限责任公司 | High power factor isolated buck-type power factor correction converter |
| CN102412713A (en) * | 2010-09-26 | 2012-04-11 | 立锜科技股份有限公司 | Switching power supply as well as control circuit and control method thereof |
-
2017
- 2017-07-11 CN CN201710561963.2A patent/CN107317465A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080007241A1 (en) * | 2006-07-07 | 2008-01-10 | Intersil Americas Inc. | Load compensated switching regulator |
| CN101588139A (en) * | 2008-05-21 | 2009-11-25 | 弗莱克斯电子有限责任公司 | High power factor isolated buck-type power factor correction converter |
| CN102412713A (en) * | 2010-09-26 | 2012-04-11 | 立锜科技股份有限公司 | Switching power supply as well as control circuit and control method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412421A (en) * | 2018-11-13 | 2019-03-01 | 广州金升阳科技有限公司 | A kind of parallel operation circuit |
| CN110445356A (en) * | 2019-08-15 | 2019-11-12 | 合肥联宝信息技术有限公司 | A kind of DC-DC converting means and method |
| CN112491252A (en) * | 2020-12-30 | 2021-03-12 | 深圳市永联科技股份有限公司 | Driving method and circuit for improving reliability of SIC MOSFET |
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Application publication date: 20171103 |