CN104734474B - Switched power supply and its control circuit and control method - Google Patents
Switched power supply and its control circuit and control method Download PDFInfo
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- CN104734474B CN104734474B CN201310717290.7A CN201310717290A CN104734474B CN 104734474 B CN104734474 B CN 104734474B CN 201310717290 A CN201310717290 A CN 201310717290A CN 104734474 B CN104734474 B CN 104734474B
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- Dc-Dc Converters (AREA)
Abstract
The present invention proposes a kind of switched power supply and its control circuit and control method.Switched power supply, converts input voltage into output voltage, and the switched power supply is included：Power stage circuit, according to driving signal, switches wherein at least one power switch to convert input voltage into output voltage；And control circuit, coupled with power stage circuit, control circuit includes：PWM (pulse width modulation, PWM) circuit, according to feedback signal, to produce PWM signals；And moulding weighting circuit, coupled with pwm circuit, to receive PWM signals, and according to input voltage, by in PWM signals, the time point that the liter edge (rising edge) or drop edge (falling edge) in each cycle occur, postpones one section of preset time, and then produce driving signal.
Description
Technical field
The present invention relates to a kind of switched power supply and its control circuit and control method, a kind of improve always is particularly related to
The switched power supply and its control circuit and control method of harmonic distortion (Total Harmonic Distortion, THD).
Background technology
A kind of typical isolation schematic diagram of switched power supply 100 of Figure 1A displays.As shown in Figure 1A, commutating voltage is treated
Vac is, for example, direct current or alternating voltage, after the rectification of rectification circuit 101, produces input voltage vin.Rectification circuit 101 is for example
For bridge rectifier.Isolated power converter circuit 100 receives input voltage vin using transformer circuit 102 therein, turns
It is changed to output voltage Vout.Wherein, isolation switched power supply 100 comprising aforementioned transformer circuit 102, power switch 103,
Control circuit 105, current sensing circuit 106 and voltage sensing circuit 107.Circuit 105 is controlled according to the institute of current sensing circuit 106
The current sense signal CS of the generation and feedback signal FB produced by voltage sensing circuit 107, produces driving signal GATE, will
Input voltage vin is converted to output voltage Vout.Transformer circuit 102 include the first winding W1, the second winding W2 and the 3rd around
Group W3.Wherein, the second winding is coupled to earthing potential, and the first winding W1 and tertiary winding W3 is commonly coupled to reference potential,
Voltage sensing circuit 107 senses the output voltage Vout that the second winding W2 is produced according to tertiary winding W3, produces feedback signal FB.
Figure 1B shows another schematic diagram of isolated power converter circuit 200.Wherein, control circuit 205 is according to electric current
Current sense signal CS and feedback signal FB produced by sensing circuit 106, produces driving signal GATE, by input voltage
Vin is converted to output voltage Vout.But it is that voltage sensing circuit 207 is coupled with the prior art difference shown in Figure 1A
In the second winding W2 of transformer circuit 202 output end, output voltage Vout is directly sensed, using circuit for light coupler 204,
Voltage sensing circuit 207 is sensed to output voltage Vout result, optical transition is feedback signal FB, input control circuit 205.
The problem of foregoing typical isolation switched power supply 100 and 200 has total harmonic distortion (THD), to improve
Total harmonic distortion (THD) and raising power conversion benefit, the present invention propose a kind of switched-mode power supply of improvement total harmonic distortion
Supply and its control circuit and control method.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art and defect, a kind of switching of improvement total harmonic distortion is proposed
Formula power supply unit and its control circuit and control method.
Up to above-mentioned purpose, to be sayed with regard to one of viewpoint, the invention provides a kind of switched power supply, to incite somebody to action
Input voltage is converted to output voltage, and the switched power supply is included：One power stage circuit, according to a driving signal,
Switch wherein at least one power switch to convert input voltage into output voltage；And one control circuit, with the power stage
Circuit is coupled, and the control circuit includes：One pwm circuit, according to a feedback signal, to produce a PWM signals；And one it is moulding plus
Circuit is weighed, is coupled with the pwm circuit, to receive the PWM signals, and according to the input voltage, by the PWM signals, Mei Yizhou
The time point that the liter edge (rising edge) or drop edge (falling edge) of phase occurs, postpones one section of preset time, and then produce
The driving signal.
Up to above-mentioned purpose, to be sayed with regard to another viewpoint, the invention provides a kind of control of switched power supply electricity
Road, the wherein switched power supply are to convert input voltage into output voltage, including a power stage circuit, according to one
Signal is driven, switching wherein at least one power switch is to convert input voltage into output voltage, and the control circuit is included：
One pwm circuit, according to a feedback signal, to produce a PWM signals；And a moulding weighting circuit, coupled with the pwm circuit,
To receive the PWM signals, and according to the input voltage, by the PWM signals, the liter edge (rising edge) in each cycle or
The time point that edge (falling edge) occurs is dropped, postpones one section of preset time, and then produce the driving signal.
In a kind of preferably implementation kenel, the preset time extends when the input voltage rises, under the input voltage
Shorten during drop.
In foregoing implementation kenel, the preset time can be proportional to the input voltage or the input voltage variable quantity.
In a kind of preferably implementation kenel, the power stage circuit includes a transformer circuit.
In a kind of preferably implementation kenel, the moulding weighting circuit includes：One slope generating circuit is oblique to produce one
Slope, the slope generating circuit receives the PWM signals as frequency, and the Slope Facies produced by the slope generating circuit are defeated on this
Enter the inverse of voltage；And a level comparator, the slope produced by the slope generating circuit is compared with a reference level, and
Foregoing driving signal is produced according to comparative result.
In a kind of preferably implementation kenel, the moulding weighting circuit includes：One slope generating circuit is oblique to produce one
Slope, the slope generating circuit receives the PWM signals as frequency；And a level comparator, the slope generating circuit is produced
Raw slope produces according to comparative result foregoing driving signal compared with the positive ratio of the input voltage.
Up to above-mentioned purpose, to say that the invention provides a kind of controlling party of switched power supply with regard to another viewpoint
Method, the wherein switched power supply are to convert input voltage into output voltage, including a power stage circuit, according to one
Signal is driven, switching wherein at least one power switch is to convert input voltage into output voltage, and the switched-mode power supply is supplied
The control method of device is answered to include：According to a feedback signal, to produce a PWM signals；And the PWM signals are received, and according to this
Input voltage, by the PWM signals, what the liter edge (rising edge) or drop edge (falling edge) in each cycle occurred
Time point, postpones one section of preset time, and then produce the driving signal.
In a kind of preferably implementation kenel, the preset time extends when the input voltage rises, under the input voltage
Shorten during drop.
In foregoing implementation kenel, the preset time can be proportional to the input voltage or the input voltage variable quantity.
Below by specific embodiment elaborate, when be easier to understand the purpose of the present invention, technology contents, feature and its
The effect reached.
Brief description of the drawings
A kind of typical isolation schematic diagram of switched power supply 100 of Figure 1A displays；
Figure 1B shows another schematic diagram of isolated power converter circuit 200；
One embodiment of Fig. 2A -2C display present invention；
Fig. 3 A-3J show voltage-dropping type, booster type, back-pressure type, buck-boost type and liter back-pressure type power stage either synchronously or asynchronously
Circuit；
Fig. 4 is shown according to the present invention, input voltage vin and the preset time T delay of delay signal waveform schematic diagram；
Fig. 5 shows second embodiment of the invention；
Fig. 6 A-6C displays present invention the three, the 4th, the 5th embodiment.
Symbol description in figure
100,200 isolation switched power supplies
101 rectification circuits
102,202 transformer circuits
103 power switch
105,205 control circuits
106 current sensing circuits
107 voltage sensing circuits
204 circuit for light coupler
300 switched power supplies
302 power stage circuits
303 power switch
305 control circuits
3051 pwm circuits
3053 moulding weighting circuits
CS current sense signals
Cs1 charging current sources
Cs2 discharge currents source
C1 electric capacity
FB feedback signals
I, I1, I2 electric current
N1, N2, N3, N4, N5 negater
PWM1 PWM signals
PWM2 drives signal
Q output ends
Q1, Q2 are switched
R resets end
S sets end
Tdelay1, Tdelay2 preset time
Vac treats commutating voltage
Vin input voltages
Vout output voltages
The windings of W1 first
The windings of W2 second
The W3 tertiary windings
Embodiment
Fig. 2A -2C are referred to, one embodiment of the present invention is shown.As shown in Figure 2 A, switched power supply 300
Include power stage circuit 302 and control circuit 305.Power stage circuit 302 is opened according to a driving signal GATE, switching wherein power
Close 303 input voltage vin is converted into output voltage Vout.Control circuit 305 is coupled with power stage circuit 302, and it includes
PWM (pulse width modulation, PWM) circuit 3051 and moulding weighting circuit 3053.Pwm circuit 3051
According to feedback signal FB, to produce PWM signals PWM1.Feedback signal FB is related to output voltage Vout, for example, can be derived from power
The output end of level circuit 302 obtains from output voltage Vout or uses the isolated of transformer when power stage circuit 302
During circuit for power conversion, it can be obtained from assists winding.Moulding weighting circuit 3053 is coupled with pwm circuit 3051, to receive PWM
Signal PWM1, and according to input voltage vin, by PWM signals PWM1, the liter edge (rising edge) or drop edge in each cycle
The time point that (falling edge) occurs, postpones one section of preset time T delay1 or Tdelay2, as Fig. 2 B and 2C illustrates, enters
And produce driving signal PWM2.As Fig. 2 B and 2C illustrates, pwm circuit 3051 produces PWM signal PWM1, and is inputted moulding
Weighting circuit 3053.Refering to Fig. 2 B, the time point that the liter edge in PWM signals PWM1 each cycles occurs moulding weighting circuit 3053,
Postpone one section of preset time T delay1, and produce driving signal PWM2.Refering to Fig. 2 C, moulding weighting circuit 3053 is by PWM signals
The time point that the drop edge in PWM1 each cycles occurs, postpones one section of preset time T delay2, and produces driving signal PWM2.Wherein,
Power stage circuit 302 except Figure 1A with shown in Figure 1B isolate switched power supply in addition to, also can be for either synchronously or asynchronously
Voltage-dropping type, booster type, back-pressure type or buck-boost type power stage circuit, as shown in Fig. 3 A-3J.As referring to figs. la and 1b, isolation is cut
Switching power supplier 100 and 200 contains transformer circuit 102 and 202.
Fig. 4 is shown according to the present invention, input voltage vin and the preset time T delay of delay signal waveform schematic diagram.
As illustrated, preset time T delay extends when input voltage vin rises, shorten when the input voltage vin declines.It is a kind of
Preferably embodiment is that preset time T delay is set as being proportional to input voltage vin or is proportional to defeated in the unit interval
Enter the variation delta Vin of voltage（The voltage difference of i.e. current time and previous time）.
Fig. 5 shows second embodiment of the invention.The present embodiment shows a kind of more specific reality of moulding weighting circuit 3053
Apply example.In the present embodiment, moulding weighting circuit 3053 is such as, but not limited to postpone the liter edge in each cycle in PWM signals PWM1
The time point of generation, makes it postpone one section of preset time T delay1, and produces driving signal PWM2.Fig. 5 shows moulding weighting circuit
3053 include negater N1, N2, N3 and N4, switch Q1 and Q2, charging current source Cs1, with electric capacity C1, wherein switch Q1 with
Q2, charging current source Cs1 and electric capacity C1 constitute slope generating circuit, and the frequency of this slope generating circuit is by PWM signals PWM1
Determine, and charging current source Cs1 electric current I is proportional to the inverse of input voltage vin.Negater N1, N2 purpose are to maintain
PWM signals PWM1 work ratio but the absolute value for changing its height level, needed for the operation to meet switch Q1 and Q2.If
The levels of PWM signals PWM1 in itself are appropriate, then negater N1, N2 can not be needed in circuit.Charging current source circuit Cs1 is produced
Electric current I, and electric current I is proportional to the inverse of input voltage vin；Switch Q1 and Q2 switching is controlled by PWM signals PWM1 work
Than via switch Q1 and Q2 switching, control electric capacity C1 discharge and recharge makes electric capacity C1 voltage（I.e. slope generating circuit is produced
Raw slope）It is relevant to the inverse of input voltage vin, then produces via negater N3 and N4 driving signal PWM2, you can
Produce carryover effects.In detail, it is electric because electric current I is proportional to the inverse of input voltage vin, therefore when input voltage vin is higher
Stream I is smaller, and electric capacity C1 charging rate is slower, and the level change point for reaching negater N3 is slower, that is, the time postponed is just
Than in input voltage vin.In the present embodiment, it is possible to use comparator replaces negater N3 and N4, a termination of comparator
Electric capacity C1 voltage is received, the other end receives a reference voltage（Level change point equivalent to negater N3）；Or use one
Individual smith trigger (smith trigger) replaces negater N3 and N4.Negater, comparator or Smith touch
Hair device plays the role of level and compared, and can be considered a kind of form of level comparator.
In fact, according to basic physical equation, capacitance（C）And voltage（V）Product be equal to electric current（i）And the time（t）
Product（CV=it）, therefore such as to change time delay and the time delay of making is proportional to input voltage vin, except real according to Fig. 5
The mode for applying example is come outside variable-current I, can also change voltage.The 3rd embodiment, this implementation of Fig. 6 A display present invention
Example shows another more specific embodiment of moulding weighting circuit 3053, similar to Fig. 5 second embodiment, but charging current
Source Cs1 electric current I be fixed value, and in moulding weighting circuit 3053 include a comparator Comp1, by electric capacity C1 voltage with it is defeated
The correlation Vin/R for entering voltage Vin compares, and wherein R can be desired ratio value.Correlation Vin/R for example may be derived from input
Voltage Vin partial pressure.In the present embodiment, it PWM signals PWM2 is transformed to the time point of high levels from low level, compare
The time point of high levels is transformed to from low level in PWM signals PWM1, the time postponed is proportional to input voltage vin.
Slope generating circuit in Fig. 5 and 6A is the slope generating circuit of rising waveform；The present invention is not limited thereto, also may be used
Using the slope generating circuit of other patterns, such as shown in the slope generating circuit of the falling waveform shown in Fig. 6 B or Fig. 6 C
The slope generating circuit that has concurrently of rise and fall waveform, wherein Cs2 is discharge current source, in Fig. 6 C embodiments, charging current
Source Cs1 produces charging current I1, and discharge current source Cs2 produces charging current I2, and both can be equal or unequal.Using Fig. 6 B
Or during slope generating circuit shown in Fig. 6 C, can optionally change comparator Comp1 input connected mode.
It should be further understood that such as to postpone the time point that PWM signals PWM1 transforms to low level from high levels, then can be in above example
In the circuit shown, the frequency of slope generating circuit is controlled using PWM signals PWM1 anti-phase signal, you can.
It should be noted that, according to the present invention, total harmonic distortion (Total Harmonic Distortion, THD) and electromagnetism
Disturb (electro-magnetic interference, EMI）It can all be improved, and with quasi-resonance (quasi
Resonant, QR) switched power supply effect.The applicable operator scheme of the present invention, preferred application is in borderline conduction mould
Formula (boundary conduction mode, BCM), this is technology commonly used in the art, be will not be described here.Phase
Compared with typical quasi-resonance switched power supply, circuit of the invention is more succinct, and mode of operation is also more simple, and this is all
It is that the present invention is better than in place of prior art.By taking typical quasi-resonance switched power supply as an example, prior art must not between
Detect disconnectedly in output signal, the turnover time point of height level, its circuit and mode of operation are relatively complicated, the cost of manufacture
Also it is higher.
Illustrate the present invention for preferred embodiment above, simply the above, only makes those skilled in the art easy
In understand present disclosure, not for limit the present invention interest field.Under the same spirit of the present invention, this area skill
Art personnel can think and various equivalence changes.For example, icon is directly connected in each embodiment two circuits or interelement, can be planted
The other circuits or element of major function are not influenceed.All this kind, can all analogize and obtain according to teachings of the present invention, therefore, this
The scope of invention should cover all equivalence changes of above and other.
Claims (10)
1. a kind of switched power supply, to convert input voltage into output voltage, it is characterised in that the suitching type
Power supply unit is included：
One power stage circuit, according to a driving signal, switching wherein at least one power switch is defeated to convert input voltage into
Go out voltage；And
One control circuit, is coupled, the control circuit includes with the power stage circuit：
One PWM circuit, according to a feedback signal, to produce a pulse width modulation signal；And
One moulding weighting circuit, is coupled with the PWM circuit, to receive the pulse width modulation signal, and according to input electricity
Pressure, by the pulse width modulation signal, the time point for rising edge or drop edge generation in each cycle postpones one section of preset time, and then produce
The raw driving signal；
Wherein, the moulding weighting circuit includes：
One slope generating circuit, to produce a slope, the slope generating circuit receives the pulse width modulation signal as frequency, and
Inverse of the Slope Facies on the input voltage produced by the slope generating circuit；And
One level comparator, the slope produced by the slope generating circuit is compared with a reference level, and according to comparative result
And produce foregoing driving signal.
2. switched power supply as claimed in claim 1, wherein, the preset time rises time delay in the input voltage
It is long, shorten when the input voltage declines.
3. switched power supply as claimed in claim 2, wherein, the preset time is proportional to the input voltage or direct ratio
In the variable quantity of the input voltage in the unit interval.
4. switched power supply as claimed in claim 1, wherein, the power stage circuit includes a transformer circuit.
5. a kind of switched power supply, to convert input voltage into output voltage, it is characterised in that the suitching type
Power supply unit is included：
One power stage circuit, according to a driving signal, switching wherein at least one power switch is defeated to convert input voltage into
Go out voltage；And
One control circuit, is coupled, the control circuit includes with the power stage circuit：
One PWM circuit, according to a feedback signal, to produce a pulse width modulation signal；And
One moulding weighting circuit, is coupled with the PWM circuit, to receive the pulse width modulation signal, and according to input electricity
Pressure, by the pulse width modulation signal, the time point for rising edge or drop edge generation in each cycle postpones one section of preset time, and then produce
The raw driving signal；
Wherein, the moulding weighting circuit includes：
One slope generating circuit, to produce a slope, the slope generating circuit receives the pulse width modulation signal as frequency；With
And
One level comparator, the slope produced by the slope generating circuit is compared with the positive ratio of the input voltage, and root
Foregoing driving signal is produced according to comparative result.
6. a kind of control circuit of switched power supply, wherein the switched power supply is input voltage to be changed
For output voltage, including a power stage circuit, according to a driving signal, switching wherein at least one power switch is electric that will input
Pressure is converted to output voltage, it is characterised in that the control circuit is included：
One PWM circuit, according to a feedback signal, to produce a pulse width modulation signal；And
One moulding weighting circuit, is coupled with the PWM circuit, to receive the pulse width modulation signal, and according to input electricity
Pressure, by the pulse width modulation signal, the time point for rising edge or drop edge generation in each cycle postpones one section of preset time, and then produce
The raw driving signal；
Wherein, the moulding weighting circuit includes：
One slope generating circuit, to produce a slope, the slope generating circuit receives the pulse width modulation signal as frequency, and
Inverse of the Slope Facies on the input voltage produced by the slope generating circuit；And
One level comparator, the slope produced by the slope generating circuit is compared with a reference level, and according to comparative result
And produce foregoing driving signal.
7. the control circuit of switched power supply as claimed in claim 6, wherein, the preset time is in the input voltage
Extend during rising, shorten when the input voltage declines.
8. the control circuit of switched power supply as claimed in claim 7, wherein, the preset time is proportional to the input
Voltage or the input voltage variable quantity.
9. the control circuit of switched power supply as claimed in claim 6, wherein, the power stage circuit includes a transformation
Device circuit.
10. a kind of control circuit of switched power supply, the wherein switched power supply are input voltage to be turned
Output voltage, including a power stage circuit are changed to, according to a driving signal, switches wherein at least one power switch to input
Voltage conversion is output voltage, it is characterised in that the control circuit is included：
One PWM circuit, according to a feedback signal, to produce a pulse width modulation signal；And
One moulding weighting circuit, is coupled with the PWM circuit, to receive the pulse width modulation signal, and according to input electricity
Pressure, by the pulse width modulation signal, the time point for rising edge or drop edge generation in each cycle postpones one section of preset time, and then produce
The raw driving signal；
Wherein, the moulding weighting circuit includes：
One slope generating circuit, to produce a slope, the slope generating circuit receives the pulse width modulation signal as frequency；With
And
One level comparator, the slope produced by the slope generating circuit is compared with the positive ratio of the input voltage, and root
Foregoing driving signal is produced according to comparative result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310717290.7A CN104734474B (en) | 2013-12-23 | 2013-12-23 | Switched power supply and its control circuit and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310717290.7A CN104734474B (en) | 2013-12-23 | 2013-12-23 | Switched power supply and its control circuit and control method |
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| Publication Number | Publication Date |
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| CN104734474A CN104734474A (en) | 2015-06-24 |
| CN104734474B true CN104734474B (en) | 2017-07-18 |
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| CN111049360B (en) * | 2019-12-31 | 2021-05-18 | 广州金升阳科技有限公司 | Voltage reduction circuit and voltage reduction control method |
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|---|---|---|---|---|
| CN1182507A (en) * | 1995-04-21 | 1998-05-20 | Gec阿尔斯托姆Acec运输公司 | Method for processing PWM waves and device therefor |
| CN1385954A (en) * | 2002-06-21 | 2002-12-18 | 浙江大学 | Phase-shift controlled bidirectional dc-dc converter |
| US7017069B2 (en) * | 1999-03-16 | 2006-03-21 | Seiko Epson Corporation | PWM control circuit, microcomputer and electronic equipment |
| TW201325054A (en) * | 2011-12-01 | 2013-06-16 | Richtek Technology Corp | Switching regulator and control circuit and control method thereof |
| CN103296904A (en) * | 2012-02-29 | 2013-09-11 | 黄煜梅 | Power-factor correction constant current controller and control method |
-
2013
- 2013-12-23 CN CN201310717290.7A patent/CN104734474B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1182507A (en) * | 1995-04-21 | 1998-05-20 | Gec阿尔斯托姆Acec运输公司 | Method for processing PWM waves and device therefor |
| US7017069B2 (en) * | 1999-03-16 | 2006-03-21 | Seiko Epson Corporation | PWM control circuit, microcomputer and electronic equipment |
| CN1385954A (en) * | 2002-06-21 | 2002-12-18 | 浙江大学 | Phase-shift controlled bidirectional dc-dc converter |
| TW201325054A (en) * | 2011-12-01 | 2013-06-16 | Richtek Technology Corp | Switching regulator and control circuit and control method thereof |
| CN103296904A (en) * | 2012-02-29 | 2013-09-11 | 黄煜梅 | Power-factor correction constant current controller and control method |
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| CN104734474A (en) | 2015-06-24 |
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