CN106300968A - Switching power circuit and the control method of switching power circuit - Google Patents
Switching power circuit and the control method of switching power circuit Download PDFInfo
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- CN106300968A CN106300968A CN201510292045.5A CN201510292045A CN106300968A CN 106300968 A CN106300968 A CN 106300968A CN 201510292045 A CN201510292045 A CN 201510292045A CN 106300968 A CN106300968 A CN 106300968A
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Classifications
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- 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
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of switching power circuit, including power supply, the first switching tube, second switch pipe, inductance, electric capacity and controller；One end of described inductance is connected with the positive pole of described power supply by described first switching tube, the other end is connected with the negative pole of described power supply by electric capacity, and described inductance is connected with the negative pole of described power supply by described second switch pipe with the public connecting end of described first switching tube；Described controller, for output pulse width modulated signal to described first switching tube and second switch pipe, to control the first switching tube and the duty of second switch pipe；Described controller is additionally operable to detect the input voltage of described both ends of power, and adjusts the cycle time of described pulse-width signal according to described input voltage.The invention also discloses a kind of switching power circuit control method.Present invention decreases inductance volume, improve the work efficiency of Power convert.
Description
Technical field
The present invention relates to switch power technology field, particularly relate to switching power circuit and switching power circuit
Control method.
Background technology
As it is shown in figure 1, existing Switching Power Supply generally includes inductance L ＇, electric capacity C ＇, the first switching tube
Q1 ＇, second switch pipe Q2 ＇ and controller 10 ＇, export corresponding pulsewidth by controller 10 ＇ and adjust
Signal processed controls the first switching tube Q1 ＇ and the conducting of second switch pipe Q2 ＇ and cut-off, but due to defeated
Enter spread of voltage, in order to reach the effect of output voltage stabilization, need to detect the output of electric capacity C ＇ two ends
The size of voltage, adjusts the dutycycle of pulse-width signal according to the size of output voltage.Such as in input
When voltage raises, need to maintain same output voltage, then need to reduce the dutycycle of pulse-width signal,
Inductance input is connected to the time of input power and shortens, and the time needing inductance to power is elongated, and inductance stores up
Can increase, so that inductance volume increases, the work efficiency of Power convert.
Foregoing is only used for auxiliary and understands technical scheme, does not represent and recognizes that foregoing is
Prior art.
Summary of the invention
A kind of switching power circuit of offer and the controlling party of switching power circuit are provided
Method, it is intended to reduce inductance volume, improves the work efficiency of Power convert.
To achieve these goals, the present invention provides a kind of switching power circuit, including power supply, first opens
Guan Guan, second switch pipe, inductance, electric capacity and controller；One end of described inductance is opened by described first
The positive pole of power supply described in Guan Guanyu connects, and the other end is connected with the negative pole of described power supply by electric capacity, described
The public connecting end of inductance and described first switching tube is by the negative pole of described second switch pipe with described power supply
Connect；Described controller, for output pulse width modulated signal to described first switching tube and second switch pipe,
To control the first switching tube and the duty of second switch pipe；Described controller is additionally operable to detect described electricity
The input voltage at two ends, source, and the cycle time of described pulse-width signal is adjusted according to described input voltage.
Preferably, described first switching tube is the first field effect transistor, the drain electrode of described first field effect transistor with
The positive pole of described power supply connects, and source electrode and described inductance connection, grid is connected with described controller；Described
Second switch pipe is the second field effect transistor, the drain electrode of described second field effect transistor and described first field effect transistor
Source electrode connect, source electrode is connected with the negative pole of described power supply, and grid is connected with described controller.
Preferably, described switching power circuit also includes phase inverter, and the grid of described second field effect transistor leads to
Cross described phase inverter to be connected with the signal output part of described controller；The grid of described first field effect transistor with
Described signal output part connects.
Preferably, described controller, specifically for when described input voltage raises, shortens described pulsewidth and adjusts
The cycle time of signal processed；When described input voltage reduces, extend the cycle of described pulse-width adjustment signal
Time.
Preferably, described controller includes error amplifier, sawtooth generator and comparator, Qi Zhongsuo
The positive pole of the voltage input end and described power supply of stating sawtooth generator is connected, outfan and described comparator
One input connect；The in-phase input end of described error amplifier is connected with preset standard voltage source,
Inverting input is connected with the positive pole of the output voltage at described electric capacity two ends, outfan and described comparator
Another input connects；The outfan of described comparator is used for exporting described pulse-width signal.
Preferably, described controller is specifically for pre-according to described input voltage vin 2, described electric capacity two ends
If output voltage vo, preset time normal period T1 and preset standard mains voltage Vin1 adjust
T2 cycle time of described pulse-width signal, described cycle time, T2 met:
Additionally, for achieving the above object, the present invention also provides for the control method of a kind of switching power circuit,
Described switching power circuit includes power supply, the first switching tube, second switch pipe, inductance, electric capacity and control
Device；One end of described inductance is connected with the positive pole of described power supply by described first switching tube, and the other end leads to
Crossing electric capacity to be connected with the negative pole of described power supply, described inductance leads to the public connecting end of described first switching tube
Cross described second switch pipe to be connected with the negative pole of described power supply；Described controller, modulates for output pulse width
Signal is to described first switching tube and second switch pipe, to control the first switching tube and the work of second switch pipe
Make state；
The control method of described switching power circuit comprises the following steps:
Described controller detects the input voltage of described both ends of power；
Described controller adjusts the cycle time of described pulse-width signal according to described input voltage.
Preferably, during the cycle that described controller adjusts described pulse-width signal according to described input voltage
Between particularly as follows:
When described input voltage raises, controller shortens the cycle time of described pulse-width signal；
When described input voltage reduces, controller extends the cycle time of described pulse-width adjustment signal.
Preferably, the control method of described switching power circuit also includes:
Described controller detects the output voltage at described electric capacity two ends；
Described controller adjusts the dutycycle of described pulse-width signal according to described output voltage.
Preferably, during the cycle that described controller adjusts described pulse-width signal according to described input voltage
Between include:
According to described input voltage vin 2, described electric capacity two ends preset output voltage vo, preset standard
Cycle time, T1 and preset standard mains voltage Vin1 adjusted the cycle time of described pulse-width signal
T2, described cycle time, T2 met:
The embodiment of the present invention is by the input voltage of controller detection both ends of power, and adjusts according to input voltage
Whole output is to the first switching tube and the cycle time of the pulse-width signal of second switch pipe, when described input
When voltage raises, shorten the cycle time of described pulse-width signal；When described input voltage reduces,
Extend the cycle time of described pulse-width signal.Thus maintain ripple current constant, regulated output voltage,
Owing to the change according to input voltage adjusts the first switching tube and the ON time of second switch pipe, it is not necessary to increase
Add the inductance value of inductance in prior art, therefore can effectively reduce inductance volume, improve Power convert
Work efficiency.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of traditional switch power circuit；
Fig. 2 is the electrical block diagram of switching power circuit first embodiment of the present invention；
Fig. 3 is the electrical block diagram of switching power circuit the second embodiment of the present invention；
Fig. 4 is the signal waveforms in switching power circuit the second embodiment of the present invention；
Fig. 5 is the schematic flow sheet of control method one embodiment of switching power circuit of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, do referring to the drawings further
Explanation.
Detailed description of the invention
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not used to limit
Determine the present invention.
The present invention provides a kind of switching power circuit, with reference to Fig. 2, in one embodiment, this switch power supply
Road includes power supply U, the first switching tube Q1, second switch pipe Q2, inductance L, electric capacity C and controller
10；One end of described inductance L is connected by the positive pole of described first switching tube Q1 and described power supply U,
The other end is connected by the negative pole of electric capacity C and described power supply U, described inductance L and described first switching tube
The public connecting end of Q1 is connected by the negative pole of described second switch pipe Q2 and described power supply U；Described control
Device 10 processed, for output pulse width modulated signal to described first switching tube Q1 and second switch pipe Q2, with
Control the first switching tube Q1 and the duty of second switch pipe Q2；Described controller 10 is additionally operable to inspection
Survey the input voltage at described power supply U two ends, and adjust described pulse-width signal according to described input voltage
Cycle time.
The switching power circuit that the embodiment of the present invention provides can apply in Switching Power Supply, it is also possible to application
In the terminal with Switching Power Supply, such as television set, PC etc..Above-mentioned duty includes conducting state
And cut-off state.
It is understood that the structure of above-mentioned first switching tube Q1 and second switch pipe Q2 can be according to reality
Border needs to be configured, in the present embodiment, it is preferable that above-mentioned first switching tube Q1 is the first field effect transistor,
The drain electrode of described first field effect transistor is connected with the positive pole of described power supply U, and source electrode is connected with described inductance L,
Grid is connected with described controller 10；Described second switch pipe Q2 is the second field effect transistor, described second
The drain electrode of field effect transistor is connected with the source electrode of described first field effect transistor, source electrode and the negative pole of described power supply U
Connecting, grid is connected with described controller 10.In the present embodiment, it is preferable that above-mentioned first field effect transistor
With the field effect transistor that the second field effect transistor is N-channel.
Specifically, in the present embodiment, above-mentioned first switching tube Q1 and second switch pipe Q2 operationally,
The duty of the first switching tube Q1 and second switch pipe Q2 is completely contrary, i.e. as the first switching tube Q1
The when of conducting, second switch pipe Q2 ends, so that power supply U is inductance L charging, is electric capacity C simultaneously
Two ends provide output voltage；When the first switching tube Q1 cut-off when, second switch pipe Q2 turns on, electricity
Sense L is discharged by second switch pipe Q2, provides output voltage for electric capacity C two ends simultaneously.
In the present embodiment, so that the duty of the first switching tube Q1 and second switch pipe Q2 is complete
On the contrary, can take various ways, such as, controller 10 can include for exporting two kinds simultaneously anti-phase
Two signal output parts of pulse-width signal, and these two signal output parts respectively with the first switching tube
The grid of Q1 and second switch pipe Q2 connects, thus ensures the first switching tube Q1 and second switch pipe Q2
Duty the most contrary.Can in the way of employing be: controller 10 is direct by pulse-width signal
Output is to the first switching tube Q1, simultaneously by a phase inverter, exports this pulse-width signal to second
Switching tube Q2, thus ensure that the complete phase of duty of the first switching tube Q1 and second switch pipe Q2
Instead.
Specifically, when using phase inverter, above-mentioned switching power circuit also includes phase inverter 20, described the
The grid of two field effect transistor is connected with the signal output part of described controller 10 by described phase inverter 20；
The grid of described first field effect transistor is connected with described signal output part.In the present embodiment, above-mentioned phase inverter
The input of 20 and the signal output part of described controller 10, the outfan of phase inverter 20 and described second
The grid of field effect transistor connects.
It should be noted that, concrete mode cycle time that controller noted above 10 adjusts pulse-width signal is:
Controller 10 is specifically for when described input voltage raises, when shortening the cycle of described pulse-width signal
Between；When described input voltage reduces, extend the cycle time of described pulse-width signal.
It should be noted that be equivalent to the cycle time shortening pulse-width signal improve the first switch
Pipe Q1 and the switching frequency of second switch pipe Q2, be equivalent to the cycle time extending pulse-width signal
Reduce the first switching tube Q1 and the switching frequency of second switch pipe Q2.In the present embodiment, pulsewidth is adjusted
Adjustment amount cycle time of signal processed can be configured according to actual needs, does not do limiting further at this
Fixed.Specifically, in the time period DT of second switch pipe Q2 conducting, inductance L both end voltage is-Vout,
Inductive current is decreased to i2 by i1, its ripple size i1-i2=Vout/A*DT, and wherein A is inductance L's
Inductance value.When input voltage improves, DT increases, and causes ripple current to increase, and makes inductance closer to full
With.For maintaining ripple current constant, inductance value A of inductance L can be increased or reduce pulse-width signal
T cycle time, i.e. improve switching frequency.
The embodiment of the present invention detects the input voltage at power supply U two ends by controller 10, and according to input electricity
Pressure adjusts and exports to the first switching tube Q1 and the cycle time of the pulse-width signal of second switch pipe Q2,
When described input voltage raises, shorten the cycle time of described pulse-width signal；When described input electricity
When pressure drop is low, extend the cycle time of described pulse-width signal.Thus maintain ripple current constant, surely
Determine output voltage, owing to adjusting the first switching tube Q1 and second switch pipe Q2 according to the change of input voltage
ON time, it is not necessary to increase the inductance value of inductance L in prior art, therefore can effectively reduce inductance
Volume, improves the work efficiency of Power convert.
Further, with reference to Fig. 3, based on above-described embodiment, in the present embodiment, controller noted above 10 can
To use the digitial controllers such as DSP, FPGA to realize.Such as, controller noted above 10 includes that error is amplified
Device 11, sawtooth generator 12 and comparator 13, the voltage input of wherein said sawtooth generator 12
End is connected with the positive pole of described power supply U, and outfan is connected with an input of described comparator 13；Described
The in-phase input end of error amplifier 11 is connected with preset standard voltage source VCC, inverting input with
The positive pole of the output voltage at described electric capacity C two ends connects, another input of outfan and described comparator 13
End connects；The outfan of described comparator 13 is used for exporting described pulse-width signal.
Specifically, above-mentioned sawtooth generator 12 can be realized by enumerator.As shown in Figure 4, a is electricity
Holding two ends output voltage amplitude, b is that (input voltage by power supply U two ends is true for sawtooth waveforms amplitude limit value
Fixed), c is sawtooth generator output voltage.When c is less than a, the first switching tube Q1 conducting second
Switching tube Q2 ends；When c is higher than a, the first switching tube Q1 cut-off second switch pipe Q2 conducting.
When c is higher than b, sawtooth generator starts a new cycle, the cycle of corresponding pulse-width signal
Time, therefore when input voltage raises, control to reduce b, and then the week of pulse-width signal can be reduced
Time phase, improve switching frequency.
It should be noted that, the mode that the cycle time of above-mentioned pulse-width signal adjusts can be according to reality
Needs are configured, in the present embodiment, it is preferable that controller noted above 10 is specifically for according to described input
Output voltage vo, preset time normal period T1 that voltage Vin2, described electric capacity two ends are preset and pre-
The standard mains voltage Vin1 put adjusts T2 cycle time of described pulse-width signal, described cycle time
T2 meets:
Can obtain according to above-mentioned formulaI.e. can directly push away from this expression formula
Derive, when the voltage at power supply U two ends raises so that T2 cycle time of pulse-width signal shortens,
Thus improve the first switching tube Q1 and the switching frequency of second switch pipe Q2；Electricity when power supply U two ends
When pressure drop is low so that T2 cycle time of pulse-width signal extends, thus reduces the first switching tube
Q1 and the switching frequency of second switch pipe Q2.It is understood that the output that above-mentioned electric capacity two ends are preset
Voltage vo can also use the actual output voltage at electric capacity C two ends to calculate.
Further, in conjunction with reference to Fig. 2 and Fig. 5, the present invention also provides for the control of a kind of switching power circuit
Method, in the present embodiment, switching power circuit includes power supply U, the first switching tube Q1, second switch pipe
Q2, inductance L, electric capacity C and controller 10；Described first switching tube is passed through in one end of described inductance L
Q1 is connected with the positive pole of described power supply U, and the other end is connected by the negative pole of electric capacity C and described power supply U,
The public connecting end of described inductance L and described first switching tube Q1 is by described second switch pipe Q2 and institute
The negative pole stating power supply U connects；Described controller 10, opens for output pulse width modulated signal to described first
Close pipe Q1 and second switch pipe Q2, to control the first switching tube Q1 and the work shape of second switch pipe Q2
State；
The control method of described switching power circuit comprises the following steps:
Step S10, described controller 10 detects the input voltage at described power supply U two ends；
Step S20, described controller 10 adjusts the week of described pulse-width signal according to described input voltage
Time phase.
In the present embodiment, above-mentioned switching power circuit is the circuit structure in above-described embodiment, does not does at this
Repeat further.
It should be noted that, concrete mode cycle time that controller noted above 10 adjusts pulse-width signal is:
When described input voltage raises, controller 10 shortens the cycle time of described pulse-width signal；Work as institute
When stating input voltage reduction, controller 10 extends the cycle time of described pulse-width signal.
It should be noted that be equivalent to the cycle time shortening pulse-width signal improve the first switch
Pipe Q1 and the switching frequency of second switch pipe Q2, be equivalent to the cycle time extending pulse-width signal
Reduce the first switching tube Q1 and the switching frequency of second switch pipe Q2.In the present embodiment, pulsewidth is adjusted
Adjustment amount cycle time of signal processed can be configured according to actual needs, does not do limiting further at this
Fixed.Specifically, in the time period DT of second switch pipe Q2 conducting, inductance L both end voltage is-Vout,
Inductive current is decreased to i2 by i1, its ripple size i1-i2=Vout/A*DT, and wherein A is inductance L's
Inductance value.When input voltage improves, DT increases, and causes ripple current to increase, and makes inductance closer to full
With.For maintaining ripple current constant, inductance value A of inductance L can be increased or reduce pulse-width signal
T cycle time, i.e. improve switching frequency.
The embodiment of the present invention detects the input voltage at power supply U two ends by controller 10, and according to input electricity
Pressure adjusts and exports to the first switching tube Q1 and the cycle time of the pulse-width signal of second switch pipe Q2,
When described input voltage raises, shorten the cycle time of described pulse-width signal；When described input electricity
When pressure drop is low, extend the cycle time of described pulse-width signal.Thus maintain ripple current constant, surely
Determine output voltage, owing to adjusting the first switching tube Q1 and second switch pipe Q2 according to the change of input voltage
ON time, it is not necessary to increase the inductance value of inductance L in prior art, therefore can effectively reduce inductance
Volume, improves the work efficiency of Power convert.
Further, based on above-described embodiment, in the present embodiment, the control of switching power circuit described above
Method processed also includes:
Described controller 10 detects the output voltage at described electric capacity C two ends；
Described controller 10 adjusts the dutycycle of described pulse-width signal according to described output voltage.
In the present embodiment, adjust described pulsewidth modulation letter by detecting the output voltage at described electric capacity C two ends
Number dutycycle so that output voltage is constant.
It should be noted that, the mode that the cycle time of above-mentioned pulse-width signal adjusts can be according to reality
Needs are configured, in the present embodiment, it is preferable that above-mentioned steps S20 includes:
According to described input voltage vin 2, described electric capacity two ends preset output voltage vo, preset standard
Cycle time, T1 and preset standard mains voltage Vin1 adjusted the cycle time of described pulse-width signal
T2, described cycle time, T2 met:
Can obtain according to above-mentioned formulaI.e. can directly push away from this expression formula
Derive, when the voltage at power supply U two ends raises so that T2 cycle time of pulse-width signal shortens,
Thus improve the first switching tube Q1 and the switching frequency of second switch pipe Q2；Electricity when power supply U two ends
When pressure drop is low so that T2 cycle time of pulse-width signal extends, thus reduces the first switching tube
Q1 and the switching frequency of second switch pipe Q2.It is understood that the output that above-mentioned electric capacity two ends are preset
Voltage vo can also use the actual output voltage at electric capacity C two ends to calculate.
These are only the preferred embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every
Utilize equivalent structure or equivalence flow process conversion that description of the invention and accompanying drawing content made, or directly or
Connect and be used in other relevant technical fields, be the most in like manner included in the scope of patent protection of the present invention.
Claims (10)
1. a switching power circuit, including power supply, the first switching tube, second switch pipe, inductance, electricity
Hold and controller；One end of described inductance is connected with the positive pole of described power supply by described first switching tube,
The other end is connected with the negative pole of described power supply by electric capacity, and described inductance is public with described first switching tube
Connect end to be connected with the negative pole of described power supply by described second switch pipe；Described controller, is used for exporting
Pulse-width signal to described first switching tube and second switch pipe, is opened controlling the first switching tube and second
Close the duty of pipe；It is characterized in that, described controller is additionally operable to detect the input of described both ends of power
Voltage, and the cycle time of described pulse-width signal is adjusted according to described input voltage.
2. switching power circuit as claimed in claim 1, it is characterised in that described first switching tube is
First field effect transistor, the drain electrode of described first field effect transistor is connected with the positive pole of described power supply, source electrode and institute
Stating inductance connection, grid is connected with described controller；Described second switch pipe is the second field effect transistor, institute
The drain electrode stating the second field effect transistor is connected with the source electrode of described first field effect transistor, source electrode and described power supply
Negative pole connects, and grid is connected with described controller.
3. switching power circuit as claimed in claim 2, it is characterised in that described switching power circuit
Also including phase inverter, the grid of described second field effect transistor is by the letter of described phase inverter with described controller
Number outfan connects；The grid of described first field effect transistor is connected with described signal output part.
4. switching power circuit as claimed in claim 1, it is characterised in that described controller is specifically used
In time raising when described input voltage, shorten the cycle time of described pulse-width signal；When described input
When voltage reduces, extend the cycle time of described pulse-width adjustment signal.
5. switching power circuit as claimed in claim 4, it is characterised in that described controller includes by mistake
Difference amplifier, sawtooth generator and comparator, the voltage input end of wherein said sawtooth generator with
The positive pole of described power supply connects, and outfan is connected with an input of described comparator；Described error is amplified
The in-phase input end of device is connected with preset standard voltage source, and inverting input is defeated with described electric capacity two ends
The positive pole going out voltage connects, and outfan is connected with another input of described comparator；Described comparator
Outfan is used for exporting described pulse-width signal.
6. the switching power circuit as according to any one of claim 1 to 5, it is characterised in that described
Controller specifically for according to described input voltage vin 2, described electric capacity two ends preset output voltage vo,
Preset time normal period T1 and preset standard mains voltage Vin1 adjusts described pulse-width signal
T2 cycle time, described cycle time, T2 met:
7. the control method of a switching power circuit, it is characterised in that described switching power circuit includes
Power supply, the first switching tube, second switch pipe, inductance, electric capacity and controller；One end of described inductance leads to
Cross described first switching tube to be connected with the positive pole of described power supply, negative by electric capacity and described power supply of the other end
Pole connects, and described inductance passes through described second switch pipe and institute with the public connecting end of described first switching tube
The negative pole stating power supply connects；Described controller, for output pulse width modulated signal to described first switching tube
With second switch pipe, to control the first switching tube and the duty of second switch pipe；
The control method of described switching power circuit comprises the following steps:
Described controller detects the input voltage of described both ends of power；
Described controller adjusts the cycle time of described pulse-width signal according to described input voltage.
8. the control method of switching power circuit as claimed in claim 7, it is characterised in that described control
Device processed according to described input voltage adjust described pulse-width signal cycle time particularly as follows:
When described input voltage raises, controller shortens the cycle time of described pulse-width signal；
When described input voltage reduces, controller extends the cycle time of described pulse-width adjustment signal.
9. the control method of switching power circuit as claimed in claim 7, it is characterised in that described in open
The control method closing power circuit also includes:
Described controller detects the output voltage at described electric capacity two ends；
Described controller adjusts the dutycycle of described pulse-width signal according to described output voltage.
10. the control method of switching power circuit as claimed in claim 7, it is characterised in that described
The cycle time that controller adjusts described pulse-width signal according to described input voltage includes:
According to described input voltage vin 2, described electric capacity two ends preset output voltage vo, preset standard
Cycle time, T1 and preset standard mains voltage Vin1 adjusted the cycle time of described pulse-width signal
T2, described cycle time, T2 met:
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510292045.5A CN106300968A (en) | 2015-06-01 | 2015-06-01 | Switching power circuit and the control method of switching power circuit |
| PCT/CN2015/092662 WO2016192276A1 (en) | 2015-06-01 | 2015-10-23 | Switching power supply circuit and method for controlling switching power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510292045.5A CN106300968A (en) | 2015-06-01 | 2015-06-01 | Switching power circuit and the control method of switching power circuit |
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| CN106300968A true CN106300968A (en) | 2017-01-04 |
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| CN201510292045.5A Pending CN106300968A (en) | 2015-06-01 | 2015-06-01 | Switching power circuit and the control method of switching power circuit |
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| WO (1) | WO2016192276A1 (en) |
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| CN118232692B (en) * | 2024-04-30 | 2025-03-18 | 上海军陶科技股份有限公司 | A digital power supply control circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683914A (en) * | 2012-09-18 | 2014-03-26 | 力智电子股份有限公司 | Power converter and operation method thereof |
| CN103856055A (en) * | 2014-02-28 | 2014-06-11 | 台达电子企业管理（上海）有限公司 | DC/DC converter and its control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11168883A (en) * | 1997-12-03 | 1999-06-22 | Fujitsu Ltd | DC / DC converter |
| JP2003092880A (en) * | 2001-09-20 | 2003-03-28 | Fuji Electric Co Ltd | Multi-output DC-DC converter |
| WO2008155600A1 (en) * | 2007-06-20 | 2008-12-24 | Nokia Corporation | Improved switched-mode power converter and method |
| CN102594141B (en) * | 2011-01-13 | 2014-12-10 | 中兴通讯股份有限公司 | Digital switching power supply conversion device and method |
-
2015
- 2015-06-01 CN CN201510292045.5A patent/CN106300968A/en active Pending
- 2015-10-23 WO PCT/CN2015/092662 patent/WO2016192276A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683914A (en) * | 2012-09-18 | 2014-03-26 | 力智电子股份有限公司 | Power converter and operation method thereof |
| CN103856055A (en) * | 2014-02-28 | 2014-06-11 | 台达电子企业管理（上海）有限公司 | DC/DC converter and its control method |
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| WO2016192276A1 (en) | 2016-12-08 |
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