CN107465333A - A kind of power supply circuit and its control method - Google Patents
A kind of power supply circuit and its control method Download PDFInfo
- Publication number
- CN107465333A CN107465333A CN201710664228.4A CN201710664228A CN107465333A CN 107465333 A CN107465333 A CN 107465333A CN 201710664228 A CN201710664228 A CN 201710664228A CN 107465333 A CN107465333 A CN 107465333A
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- output
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- circuit
- supply voltage
- voltage
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- 238000000034 method Methods 0.000 title claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims abstract description 30
- 230000008859 change Effects 0.000 claims description 15
- 230000001276 controlling effect Effects 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 3
- 210000001367 artery Anatomy 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 210000003462 vein Anatomy 0.000 description 2
- 230000001934 delay Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
-
- 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
-
- 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
- H02M1/0012—Control circuits using digital or numerical techniques
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of power supply circuit and its control method, including current regulating circuit and output circuit, when equipment to be powered needs to adjust supply voltage, supply voltage that the current regulating circuit needs according to equipment to be powered is to adjust its output current；The output circuit receives the output current, obtains output voltage according to the output current, the output voltage is the supply voltage that equipment to be powered needs.The supply voltage changes a step-length at regular intervals, and desirable value is arrived until slowly varying.
Description
Technical field
The present invention relates to a kind of electric and electronic technical field, more particularly to a kind of power supply circuit and its control method.
Background technology
The problem of matching between the power supply unit of different power supply agreements and equipment to be powered be present, for example, carrying high pass
The power supply units such as the adapter or portable power source of QC2.0/3.0 technologies wait to the mobile phone or portable power source for supporting QC2.0 technologies
When power supply unit is powered, power supply unit can pass through QC2.0 protocol handshakes with equipment to be powered.When equipment to be powered proposes that regulation supplies
When piezoelectric voltage instructs, meeting is because use the power supply unit output voltage hopping amplitude of QC2.0 technologies larger, and use QC2.0 skills
The power supply unit loop response of art is not good enough so that power supply unit output voltage easily produces overshoot response, unfavorable so as to occur
In equipment to be powered voltage change and easily cause equipment to be powered damage situation.
Prior art power supply circuit construction schematic diagram is as shown in figure 1, Fig. 1 includes DC/DC or DC/AC power section
U01, resistance R1, resistance R2 and current regulating circuit U02.Power model U01 exports output voltage Vout and input feedback voltage
VFB, resistance R1 one end are connected with output voltage Vout, and the other end is connected with resistance R2, and resistance R1 and resistance R2 common nodes connect
Feedback voltage V FB and current regulating circuit U02.Current regulating circuit U02 includes four series circuits, and each series circuit includes
One current source and a switching tube.The size of pull-down current is changed by the break-make of change-over switch, and then realizes output electricity
Press Vout change.By taking power circuit output voltage 5V, 9V, 12V, 20V as an example, electric current I01, I02, I03, I04 are corresponded to respectively
Output voltage Vout=5V, 9V, 12V, 20V.
Referring to Fig. 2, a kind of output voltage waveforms of prior art power supply circuit are illustrated, with output voltage Vout from 5V liters
To exemplified by voltage waveform during 9V, an overshoot occurs during rising to 9V in 5V, is unfavorable for equipment voltage change to be powered,
Easily power supply unit is treated to cause to damage.
The content of the invention
In view of this, it is an object of the invention to provide a kind of power supply circuit and its control method, for solving prior art
The problem of overshoot be present in existing power supply circuit output voltage.
To achieve the above object, the invention provides a kind of power supply circuit, including：
Current regulating circuit, when equipment to be powered needs to adjust supply voltage, current regulating circuit is set according to be powered
The standby supply voltage needed adjusts its output current；
Output circuit, the output current of the current regulating circuit is received, output voltage is obtained according to the output current,
The output voltage is the supply voltage that equipment to be powered needs.
Optionally, the supply voltage according to needed for equipment to be powered determines the change side of current regulating circuit output current
To at regular intervals, current regulating circuit output current changes once, until making supply voltage reach desirable value.
Optionally, described current regulating circuit includes counter, the counter return pulse signal, passes through counter
Pulse count is realized, and the output current is adjusted according to count results, when the counter counts count to setting value, the meter
Number device no longer receives institute's pulse signal, and the counter set point is determined by required supply voltage.
Optionally, the pulse signal is produced by pulse generating circuit, and the supply voltage is believed pulse with counter
Number step-by-step counting and change.
Optionally, the change direction of the output current is determined by plus-minus decision circuitry, it is described plus-minus decision circuitry according to
Current supply voltage and required supply voltage increase current supply voltage or reduced to judge, so that it is determined that the counting of counter
Direction.
Optionally, the current regulating circuit includes decoder, and the decoder receives the counting of the counter output
As a result, and by the count results be converted to switch controlling signal.
Optionally, the current regulating circuit includes current mode digital-to-analog converter, and the current mode digital-to-analog converter includes
Multiple series circuits being in parallel, the series circuit are made up of switching tube and current source, the current mode digital-to-analog converter
Switch controlled is terminated by the switch controlling signal, and output end obtains the output current.
Optionally, the output circuit includes power model, and the output circuit includes power model, according to the output
The output voltage of circuit obtains feedback voltage, and the power model receives the feedback voltage, when equipment to be powered needs to adjust
During supply voltage, the node of the feedback voltage accesses the output current of the current regulating circuit, to influence the feedback electricity
Pressure, so that power model adjusts output voltage, the output voltage of the power model is supply voltage.
Also a kind of control method of power supply circuit of the present invention, comprises the following steps：
When equipment to be powered proposes regulation supply voltage instruction, obtained according to the supply voltage required for equipment to be powered
Current regulating signal, output voltage is obtained according to the current regulating signal, the output voltage is needed for equipment to be powered
Supply voltage；The change direction of the output current is determined according to required supply voltage, at regular intervals, the output electricity
Rheologyization once, until making supply voltage reach desirable value.
Compared with prior art, the technical scheme of the present invention has advantages below：When equipment to be powered needs to adjust power supply
During voltage, output current is obtained according to the supply voltage that equipment to be powered needs, output voltage is obtained according to the output current,
The output voltage is the supply voltage needed for equipment to be powered.The change of the output current is determined according to required supply voltage
Change direction, at regular intervals, the output current changes once, until making supply voltage reach desirable value.Present invention power supply
Circuit output voltage will not produce overshoot response, avoid the phenomenon for damaging equipment to be powered.
Brief description of the drawings
Fig. 1 is prior art power supply circuit construction schematic diagram；
Fig. 2 is a kind of output voltage waveforms of prior art power supply circuit；
Fig. 3 is power supply circuit construction schematic diagram of the present invention；
Fig. 4 is the electrical block diagram of current D-A conveter of the present invention；
Fig. 5 is a kind of output voltage waveforms of power supply circuit of the present invention；
Embodiment
The preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any replacement made in the spirit and scope of the present invention, modification, equivalent method and scheme.
Thoroughly understand in order that the public has to the present invention, be described in detail in present invention below preferred embodiment specific
Details, and description without these details can also understand the present invention completely for a person skilled in the art.
More specifically description is of the invention by way of example referring to the drawings in the following passage.It should be noted that accompanying drawing is adopted
Non- accurately ratio is used with more simplified form and, only to convenience, lucidly aid in illustrating the embodiment of the present invention
Purpose.
As shown in figure 3, power supply circuit construction schematic diagram of the present invention is illustrated, including current regulating circuit and output circuit,
The current regulating circuit includes current mode digital-to-analog converter (DAC) U302, decoder U303, counter U304, plus-minus and judged
Circuit U 306, pulse generating circuit U305；The power model U301 of the output circuit including DC/DC or DC/AC converters and
Resistance R1, resistance R2.The counter U304 receives the pulse signal and plus-minus decision circuitry of pulse generating circuit U305 outputs
The plus-minus of U306 outputs judges signal, and the decoder U303 receives the count results of the counter U304 outputs, and it is exported
The size of the pull-down current of signal control electric current type digital analog converter (DAC) U302 outputs, the current mode digital-to-analog converter
(DAC) U302 output current is the output current of the current regulating circuit.The power model U301 outputs termination two
Individual divider resistance R1, R2, R1 one end are connected with R2 one end, the common node between R1 and R2 be feedback voltage V FB node, institute
State power model U301 inputs and terminate the feedback voltage V FB, output voltage Vout, the output voltage Vout are to be powered
Equipment supply voltage.The power model U301 can use polytype topological structure, including but not limited to Buck,
Boost, etc..Power supply of the present invention both includes being powered from power supply unit to equipment to be powered, makes equipment to be powered normal
Work, also include to equipment charge to be powered.
The counter U304 return pulse signals, the pulse signal are produced by pulse generating circuit U305, the arteries and veins
The each pulse rushed in signal or multiple pulses characterize a step-length of supply voltage change, are realized by counter U304 to arteries and veins
Punching counts.The plus-minus decision circuitry U306 is judged to current supply voltage according to current supply voltage and required supply voltage
Increase reduces, so that it is determined that the counting direction of counter.The original state of the counter U304 is initial output voltage pair
The digital coding answered, counter U304 current state values are that counter U304 initial state values increased or decrease pulse period number
Obtain.When the counter U304 count down to setting value, counting terminates, and the counter set point is true by required supply voltage
It is fixed.The decoder U303 receives the count results of the counter U304 outputs, exports a series of switch controlling signal controls
The size of current mode digital-to-analog converter (DAC) U302 output currents.Obtained instead according to the output voltage Vout of the output circuit
Feedthrough voltage VFB, the power model receive the feedback voltage V FB, described when equipment to be powered needs to adjust supply voltage
The node of feedback voltage accesses the output current of the current regulating circuit, to influence the feedback voltage V FB, so that power
Module adjusts output voltage Vout, and the output voltage of the power model is supply voltage.
As shown in figure 4, current mode digital-to-analog converter of the present invention (DAC) U302 circuit structure is illustrated, including multiple phases
Series circuit in parallel, the series circuit is source-series by a switch and electric current, the reversed feedthrough voltage VFB of its output end.It is described
Each switch on and off is sent by decoder U303 on series circuit switch controlling signal Q1, Q2, Q3 ..., Qn control,
The output current of current mode digital-to-analog converter (DAC) U302 is the output current of the current regulating circuit.
As shown in figure 5, illustrating a kind of output voltage waveforms of power supply circuit of the present invention, the output voltage Vout delays from 5V
Slowly the problem of rising to 9V, and overshoot will not be produced.The counter U304 often receives a pulse signal or multiple pulses letter
Number just exporting one gives decoder U303 to induction signal, and the decoder, which will receive signal and be converted into switch controlling signal, to be gone to control
The size of the current mode digital-to-analog converter (DAC) U302 output current is made, the final size for changing output voltage Vout is defeated
Go out voltage Vout and often rise the corresponding pulse of a step-length or multiple pulses.
Although embodiment is separately illustrated and illustrated above, it is related to the common technology in part, in ordinary skill
Personnel apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and the content recorded is not known, then
Refer to another embodiment on the books.
Embodiments described above, the restriction to the technical scheme protection domain is not formed.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements made within the spirit and principle of mode etc., should be included in the protection model of the technical scheme
Within enclosing.
Claims (9)
1. a kind of power supply circuit, including：
Current regulating circuit, when equipment to be powered needs to adjust supply voltage, current regulating circuit is according to equipment need to be powered
The supply voltage wanted adjusts its output current；
Output circuit, the output current of the current regulating circuit is received, output voltage is obtained according to the output current, it is described
Output voltage is the supply voltage of equipment to be powered.
2. power supply circuit according to claim 1, it is characterised in that：According to the supply voltage needed for equipment to be powered, really
The change direction of constant current regulating circuit output current, at regular intervals, current regulating circuit output current change once, directly
Reach desirable value to supply voltage is made.
3. power supply circuit according to claim 1 or 2, it is characterised in that：Described current regulating circuit includes counter,
The counter return pulse signal, pulse count is realized by counter, and according to the count results regulation output electricity
Stream, when the counter counts count to setting value, counting terminates, and the counter set point is determined by required supply voltage.
4. power supply circuit according to claim 3, it is characterised in that：The pulse signal is produced by pulse generating circuit,
The supply voltage changes with the step-by-step counting of counter pulse signals.
5. power supply circuit according to claim 3, it is characterised in that：The change direction of the output current is judged by plus-minus
Circuit determines that the plus-minus decision circuitry judges to increase current supply voltage according to current supply voltage and required supply voltage
Big or reduction, so that it is determined that the counting direction of counter.
6. power supply circuit according to claim 3, it is characterised in that：The current regulating circuit also includes decoder, institute
State decoder and receive the count results of the counter output, and the count results are converted into switch controlling signal.
7. power supply circuit according to claim 6, it is characterised in that：The current regulating circuit also includes current mode digital-to-analogue
Converter, the current mode digital-to-analog converter include multiple series circuits being in parallel, and the series circuit is by switching tube and electricity
Stream source is formed, and the switch controlled of the current mode digital-to-analog converter is terminated by the switch controlling signal, and output end obtains institute
State output current.
8. power supply circuit according to claim 1, it is characterised in that：The output circuit includes power model, according to institute
The output voltage for stating output circuit obtains feedback voltage, and the power model receives the feedback voltage, when equipment to be powered needs
When adjusting supply voltage, the node of the feedback voltage accesses the output current of the current regulating circuit.
9. a kind of control method of power supply circuit, comprises the following steps：
When equipment to be powered needs to adjust supply voltage, output current is obtained according to the supply voltage that equipment to be powered needs,
Output voltage is obtained according to the output current, the output voltage is the supply voltage needed for equipment to be powered；According to required
Supply voltage determine the change direction of the output current, at regular intervals, the output current change once, until making
Supply voltage reaches desirable value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710664228.4A CN107465333A (en) | 2017-08-04 | 2017-08-04 | A kind of power supply circuit and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710664228.4A CN107465333A (en) | 2017-08-04 | 2017-08-04 | A kind of power supply circuit and its control method |
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| Publication Number | Publication Date |
|---|---|
| CN107465333A true CN107465333A (en) | 2017-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710664228.4A Pending CN107465333A (en) | 2017-08-04 | 2017-08-04 | A kind of power supply circuit and its control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375828A (en) * | 2018-12-19 | 2019-02-22 | 惠州Tcl移动通信有限公司 | Touch screen voltage control method, device, mobile terminal and storage medium |
| CN114204807A (en) * | 2021-11-08 | 2022-03-18 | 华源智信半导体(深圳)有限公司 | Control method and control unit of DC-DC conversion unit and power supply circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110018513A1 (en) * | 2008-04-11 | 2011-01-27 | Ippei Noda | Variable voltage dc-dc converter |
| CN105991011A (en) * | 2015-01-22 | 2016-10-05 | 立锜科技股份有限公司 | Control circuit and method for programming output voltage of power converter |
| CN207218515U (en) * | 2017-08-04 | 2018-04-10 | 杰华特微电子（张家港）有限公司 | A kind of power supply circuit |
-
2017
- 2017-08-04 CN CN201710664228.4A patent/CN107465333A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110018513A1 (en) * | 2008-04-11 | 2011-01-27 | Ippei Noda | Variable voltage dc-dc converter |
| CN105991011A (en) * | 2015-01-22 | 2016-10-05 | 立锜科技股份有限公司 | Control circuit and method for programming output voltage of power converter |
| CN207218515U (en) * | 2017-08-04 | 2018-04-10 | 杰华特微电子（张家港）有限公司 | A kind of power supply circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375828A (en) * | 2018-12-19 | 2019-02-22 | 惠州Tcl移动通信有限公司 | Touch screen voltage control method, device, mobile terminal and storage medium |
| CN114204807A (en) * | 2021-11-08 | 2022-03-18 | 华源智信半导体(深圳)有限公司 | Control method and control unit of DC-DC conversion unit and power supply circuit |
| CN114204807B (en) * | 2021-11-08 | 2024-04-12 | 华源智信半导体(深圳)有限公司 | Control method of DC-DC conversion unit, control unit and power supply circuit |
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| CB02 | Change of applicant information |
Address after: 215600 west side of Guotai North Road, Zhangjiagang Economic and Technological Development Zone, Suzhou City, Jiangsu Province Applicant after: JOULWATT TECHNOLOGY (HANGZHOU) CO.,LTD. Address before: 215600, 5th Floor, Building A, Shazhouhu Science and Technology Innovation Park, Yangshe Town, Zhangjiagang, Suzhou City, Jiangsu Province Applicant before: JOULWATT TECHNOLOGY (HANGZHOU) CO.,LTD. |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171212 |
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| RJ01 | Rejection of invention patent application after publication |