CN102832817A - Method for controlling cross voltage of power switch of switching-type power converter, and circuit thereof - Google Patents
Method for controlling cross voltage of power switch of switching-type power converter, and circuit thereof Download PDFInfo
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- CN102832817A CN102832817A CN2011101585841A CN201110158584A CN102832817A CN 102832817 A CN102832817 A CN 102832817A CN 2011101585841 A CN2011101585841 A CN 2011101585841A CN 201110158584 A CN201110158584 A CN 201110158584A CN 102832817 A CN102832817 A CN 102832817A
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Abstract
The invention relates to a method for controlling the cross voltage of a power switch of a switching-type power converter, and a circuit thereof. The method comprises the following steps: when the switching-type power converter is started, the switching frequency of the power switch of the switching type power converter is controlled as the first frequency; and after a definite period of time, the switching frequency of the power switch is changed to be the second frequency, wherein the first frequency is lower than the second frequency.
Description
Technical field
The invention relates to switch type power converter (switched-mode power converter), particularly about the method and the circuit thereof of power switch cross-pressure of control switch type power converter.
Background technology
Switch type power converter, (switched-mode power supply SMPS), is a kind of power supply changeover device of electronic type also to be called switched-mode power supply.Switch type power converter is in order to change an input power supply and to provide to a load.Generally speaking, the level of the input voltage of switch type power converter and output voltage and inequality.Compared to the power supply changeover device of linear formula, switch type power converter can provide higher power conversion efficiency and less circuit size.In the switch type power converter with transformer coupled (transformer-coupled) framework, it is through the input of a transformer isolation power and output.Wherein, one side this transformer near the primary side that is called of input voltage, another side then is called secondary side.The primary side of this transformer comprises one and switches switch, and it is to utilize pulse width modulation (pulse width modulation, mode PWM) is controlled.Switch type power converter with transformer coupled framework can be further divided into the switch type power converter of forward type (forward) and flyback (fly back).
Fig. 1 shows a kind of known flyback switch type power converter.As shown in Figure 1, this switch type power converter 100 mainly comprises a rectifier 104, a transformer 106, a voltage stabilizing adjuster 108, an optical coupler 110, a control circuit 112 and a power switch SW1.This switch type power converter 100 is connected to an alternating-current voltage source 102, and the voltage that an approximate direct current is provided through this rectifier 104 is to this transformer 106 and this control circuit 112.This control circuit 112 provides a pulse width modulating signal VOUT to control this power switch SW1.This transformer 106 promptly provides power supply to secondary side through the switch change of this power switch SW1 by primary side.110 of this voltage stabilizing adjuster 108 and this optical couplers are in order to the feedback compensation signal V of output voltage that this switch type power converter 100 is provided
COMPTo this control circuit 112.Control circuit 112 promptly passes through relatively this feedback compensation signal V
COMPElectric current I with this power switch SW1 that flows through
PCarry out the computing of its pulse width modulation.
Yet the switch type power converter 100 of Fig. 1 has following shortcoming: when this switch type power converter 100 started, the output voltage of secondary side was to be begun toward rising by earth level.The characteristic of this control circuit 112 is to make its anxious desire accelerate the speed of these transformer 106 switching energies.In view of the above, this feedback compensation signal V
COMPBe that a high voltage makes this power switch SW1 have a higher switching frequency.
Fig. 2 shows this switch type power converter 100 when starting, this feedback compensation signal V
COMPElectric current I with this power switch SW1 that flows through
PGraph of a relation.As shown in Figure 2, when first switching cycle of this power switch SW1, the switching frequency of this power switch SW1 is higher, and its shut-in time is shorter, and makes this power switch SW1 when second switching cycle, get into continuous mode.That is the primary side of this transformer 106 has little time the discharge completion and promptly gets into next switching cycle, and the electric current I of feasible this power switch SW1 that flows through
PIncreasing.Because the cross-pressure of this power switch SW1 almost is proportional to electric current I
P, too high electric current I
PThe cross-pressure that will cause this power switch SW1 is too high and have the risk of damage.
In view of the above; Industry is needed to be a kind of method and circuit thereof of controlling the power switch cross-pressure of switch type power converter; It can be when a switch type power converter starts, effectively control this switch type power converter power switch cross-pressure and unlikely causing damages.
Summary of the invention
The present invention discloses a kind of method and circuit thereof of controlling the power switch cross-pressure of switch type power converter.A kind of method of controlling the power switch cross-pressure of switch type power converter according to one embodiment of the invention; Comprise the following step: when starting a switch type power converter, the switching frequency of a power switch of controlling this switch type power converter is in a first frequency; And, change switching frequency to a second frequency of this power switch through behind the special time.Wherein, this first frequency is lower than this second frequency.
A kind of method of controlling the power switch cross-pressure of switch type power converter according to another embodiment of the present invention; Comprise the following step: when starting a switch type power converter, control the switching frequency of a power switch of this switch type power converter according to one first voltage signal; And when treating this first voltage signal, according to the switching frequency of this power switch of one second voltage signal control greater than a critical value.
Controller according to a kind of switch type power converter of one embodiment of the invention comprises a multiplexer, a clock generator and a Pwm controller.This multiplexer is set so that a low level output signal to be provided when starting, and the output signal of a high level is provided after starting a period of time.This clock generator is set with the output signal according to this multiplexer one clock signal is provided.This Pwm controller is set according to this clock signal one pulse width modulating signal to be provided.
Preceding text are sketch out technical characterictic of the present invention, is able to obtain preferable understanding in order to do the detailed description that makes hereinafter.Other technical characterictic that constitutes claim target of the present invention will be described in hereinafter.
Having common knowledge the knowledgeable in the technical field under the present invention should understand, and the notion that hereinafter discloses can be used as the basis with specific embodiment and revises or design other structure or processing procedure quite easily and realize the purpose identical with the present invention.Have common knowledge the knowledgeable in the technical field under the present invention and also should understand, the construction of this type equivalence also can't break away from the appended the spirit and scope of the present invention that claim proposed.
Description of drawings
Fig. 1 shows known flyback switch type power converter;
Fig. 2 shows known flyback switch type power converter when starting, the graph of a relation of its feedback compensation signal and the electric current of the power switch of flowing through;
Fig. 3 shows the flow chart of method of power switch cross-pressure of the control switch type power converter of one embodiment of the invention;
Fig. 4 shows the method according to the power switch cross-pressure of the control switch type power converter of one embodiment of the invention, a switch type power converter when starting, the graph of a relation of its feedback compensation signal and the electric current of the power switch of flowing through;
Fig. 5 shows the sketch map of controller of the switch type power converter of one embodiment of the invention;
Fig. 6 shows the sketch map of the vibration circuit of one embodiment of the invention;
Fig. 7 shows the sketch map of the clock generator of one embodiment of the invention; And
Fig. 8 shows the signal mode figure of the switch type power converter of one embodiment of the invention.
[main element label declaration]
100 switch type power converters, 102 alternating-current voltage sources
104 rectifiers, 106 transformers
108 voltage stabilizing adjusters, 110 optical couplers
112 control circuits, 301～303 steps
502 vibration circuit, 504 clock generators
506 Pwm controllers, 508 comparators
510 multiplexers, 602 reversers
604 current sources, 606 current sources
608 current sources 610 and door
612 hysteresis comparators, 614 reversers
702 comparators, 704 current sources
706 current sources, 708 hysteresis comparators
710 reversers SW1～SW6 switch
C1～C6 electric capacity R1～R5, R
CSResistance
Embodiment
The present invention is a kind of method and circuit thereof of controlling the power switch cross-pressure of switch type power converter in this direction of inquiring into.In order to understand the present invention up hill and dale, detailed step and composition will be proposed in following description.Apparently, the execution of the present invention specific details that is not defined in those skilled in the art of the present invention and is familiar with.On the other hand, well-known composition or step are not described in the details, with the restriction of avoiding causing the present invention unnecessary.Preferred embodiment meeting of the present invention is described in detail as follows, yet except these were described in detail, the present invention can also be implemented among other the embodiment widely, and scope of the present invention constrained not, and it is as the criterion with claim afterwards.
The method of the power switch cross-pressure of control switch type power converter of the present invention and circuit thereof are when utilizing the method that combines pulse width modulation and pulse frequency modulated to suppress to start switch type power converter to reach, the problem that the cross-pressure of its power switch is too high.
Fig. 3 shows the flow chart of method of power switch cross-pressure of the control switch type power converter of one embodiment of the invention.In step 301, when starting a switch type power converter, the switching frequency of power switch of controlling this switch type power converter is in a first frequency, and gets into step 302.In step 302, judge whether through a special time.If through a special time, then get into step 303, otherwise get back to step 301.In step 303, the switching frequency of controlling this power switch is in a second frequency, and completion this method, and wherein this first frequency is lower than this second frequency.
Fig. 4 shows method according to Fig. 3 in a switch type power converter, its feedback compensation signal V when starting
COMPElectric current I with the power switch of flowing through
PGraph of a relation.As shown in Figure 4, compared to the graph of a relation of Fig. 2, the switching frequency (that is first frequency) of the power switch of Fig. 4 when starting is slower, and its shut-in time is longer.Accomplish discharge when in view of the above, the transformer of this switch type power converter is able to the closed interval, pass in this power switch and can not get into continuous mode.Treat that through behind the special time this moment, this power switch did not have the risk of damage, switch the higher second frequency of the switching frequency to of this power switch again to accelerate the conversion speed of this transformer.
Fig. 5 shows the sketch map of controller of the switch type power converter of one embodiment of the invention, and it can be in order to realizing the method for Fig. 3, and can be in order to the control circuit 112 of replacement Fig. 1.As shown in Figure 5, this controller circuitry 500 comprises a vibration circuit 502, a clock generator 504, a Pwm controller 506, a comparator 508 and a multiplexer 510.This vibration circuit 502 is in order to provide a dither signal S
JITTERThis clock generator 504 is in order to provide this Pwm controller 506 required frequency S
CLK, that is the switching frequency of this power switch SW1.This Pwm controller 506 is in order to provide this power switch SW1 required pulse width modulating signal V
OUTThis comparator 508 is in order to this dither signal S relatively
JITTERWith a reference signal V
ERADYThis multiplexer 510 is according to the output signal S of this comparator 508
OKThis dither signal S is provided
JITTEROr this feedback compensation signal V
COMPTo this clock generator 504.
This clock generator 504 mainly is according to its input signal S
FRQDraw its output signal S
CLKFrequency, and through this dither signal S
JITTERSlowly carry out its output signal S
CLKHunting of frequency.When normal mode, this dither signal S
JITTERGreater than this reference signal V
READYSo, the output signal S of this comparator 508
OKBe 1, and clock generator 504 is promptly according to this feedback compensation signal V
COMPDraw its output signal S
CLKFrequency.Yet, when starting, this dither signal S
JITTERBe to rise to this reference signal V gradually from earth level
READYLevel.During the period, the output signal S of this comparator 508
OKBe 0, and this clock generator 504 is according to this dither signal S
JITTERDraw its output signal S
CLKFrequency.Treat this dither signal S
JITTERSurmount this reference signal V
READYAfter, this clock generator 504 promptly recovers by this feedback compensation signal V
COMPControl.Preferably, can be through this reference signal of adjustment V
READYTo control this dither signal S
JITTERRSurmount this reference signal V
READYTime point, that is the so-called special time of step 302.For example, can be through setting this reference signal V
READYAnd after making that the electric current of this power switch SW1 arrives a critical value, this dither signal S
JITTERRJust surmount this reference signal V
READY
Fig. 6 shows the thin portion sketch map of this vibration circuit 502.As shown in Figure 6, this vibration circuit 502 comprises reverser 602 and 614, current source 604,606 and 608, one and door 610, one hysteresis comparator 612, switch SW 2, SW3 and a SW4 and a capacitor C 4.As discussed previously, when this vibration circuit 502 starts, input signal S
OKBe 0, thus switch SW 2 conductings, and these switch SW 3 are non-conduction with SW4.Therefore, 4 chargings of 604 pairs of these capacitor C of this current source, and be somebody's turn to do the output signal S of vibration circuit 502
JITTERRRise gradually from earth level.Treat this output signal S
JITTERRSurmount this reference signal V
READYThe time, this switch SW 2 is non-conduction, and this hysteresis comparator 612 is promptly according to output signal S
JITTERRWith reference signal V
JITTERHAnd V
JITTERLMutual conducting these switch SW 3 and SW4.In view of the above, this output signal S
JITTERRPromptly appear from these reference signals V
JITTERHAnd V
JITTERLBetween the slow wave mode of rise and fall.
Fig. 7 shows the thin portion sketch map of this clock generator 504.As shown in Figure 7, this clock generator 504 comprises a comparator 702, current source 704 and 706, a hysteresis comparator 708, a reverser 710, capacitor C 5 and C6 and switch SW 5 and SW6.The input signal S of this clock generator 504
FRQMainly be the driving force of these current sources 704 of control and 706, S
FRQBigger then these current sources 704 and 706 driving force are strong more.This comparator 702 is according to this dither signal S
JITTERThis switch SW 5 of conducting is to carry out the charge redistribution of these capacitor C 5 and C6.This hysteresis comparator 708 is promptly according to the voltage and the reference voltage V of this capacitor C 6
OSCHAnd V
OSCLMutual conducting these switch SW 5 and SW6.As discussed previously, when this clock generator 504 starts, input signal S
FRQBe this dither signal S
JITTERBecause this dither signal S
JITTERLevel lower, these current sources 704 and 706 driving force a little less than, so the output signal S of this clock generator 504
CLKFrequency (this first frequency) lower.Treat this dither signal S
JITTERRSurmount this reference signal V
READYAfter, this input signal S
FRQBecome this feedback compensation signal V
COMP, these current sources 704 and 706 driving force strengthen, so the time this clock generator 504 output signal S
CLKFrequency (this second frequency) higher.
Fig. 8 shows the signal mode figure according to the switch type power converter of Fig. 5 and Fig. 7 and vibration circuit and clock generator.As shown in Figure 8, this feedback compensation signal V
COMPBe in starting the soaring rapidly voltage saturation value V in back
JITTERH, and this dither signal S
JITTERBe to rise gradually from earth level.At this moment, the input signal S of this clock generator 504
FRQ, that is this dither signal S
JITTERBe lower than the variable range of this clock generator 504 and make the minimum fixed clock of this clock generator 504 outputs one, that is this moment this power switch SW1 switching frequency be minimum switching frequency 20KHz.Treat this dither signal S
JITTERSurmount this reference signal V
READYThe time, this feedback compensation signal V
COMPStill be positioned at this voltage saturation value V
JITTERHAt this moment, the input signal S of this clock generator 504
FRQSwitch to this feedback compensation signal V
COMP, and it is to be higher than the variable range of this clock generator 504 and to make the highest fixed clock of this clock generator 504 outputs one, that is this moment this power switch SW1 switching frequency be the highest switching frequency 60KHz.Keeping its switching frequency at this power switch SW1 is the highest switching frequency after a period of time, this feedback compensation signal V
COMPPromptly slowly drop between this highest switching frequency (second frequency) and this minimum switching frequency (first frequency), and make that the operation recovery of this controller circuitry 500 is normal.In addition, shown in the arrow of Fig. 8, this dither signal S
JITTERMake the output signal S of this clock generator 504
CLKFrequency have slowly vibration up and down.
In sum, the method for the power switch cross-pressure of control switch type power converter of the present invention and circuit thereof are the too high problems of cross-pressure of the power switch when utilizing the method that combines pulse width modulation and pulse frequency modulated to solve the startup switch type power converter to reach.
Technology contents of the present invention and technical characterstic disclose as above, yet those skilled in the art still maybe be based on teaching of the present invention and announcements and done all replacement and modifications that does not deviate from spirit of the present invention.Therefore, protection scope of the present invention should be not limited to embodiment announcement person, and should comprise various do not deviate from replacement of the present invention and modifications, and is contained by above-mentioned claim scope.
Claims (19)
1. method of controlling the power switch cross-pressure of switch type power converter comprises the following step:
When starting a switch type power converter, the switching frequency of a power switch of controlling this switch type power converter is in a first frequency; And
Behind a special time, change switching frequency to a second frequency of this power switch;
Wherein, this first frequency is lower than this second frequency.
2. method according to claim 1, wherein the switching frequency of this power switch is after the electric current of this power switch arrives a critical value, to change to this second frequency.
3. method according to claim 1, wherein this first frequency is the minimum switching frequency of this power switch.
4. method according to claim 1, wherein this second frequency is the highest switching frequency of this power switch.
5. method according to claim 1, after the switching frequency of wherein treating this power switch changed to this second frequency, the switching frequency of this power switch dropped between this first frequency and this second frequency gradually.
6. method of controlling the power switch cross-pressure of switch type power converter comprises the following step:
When starting a switch type power converter, control the switching frequency of a power switch of this switch type power converter according to one first voltage signal; And
When treating this first voltage signal, according to the switching frequency of this power switch of one second voltage signal control greater than a critical value.
7. method according to claim 6, wherein this first voltage signal is when starting, to rise to this critical value gradually from earth level.
8. method according to claim 6, wherein when this first voltage signal during greater than this critical value, this second voltage signal is higher than this first voltage signal.
9. method according to claim 8, wherein when this first voltage signal during greater than this critical value, this second voltage signal is to equal a saturation voltage value.
10. method according to claim 6, wherein this first voltage signal dither signal that is this switch type power converter.
11. method according to claim 6, wherein this second voltage signal feedback compensation signal that is this switch type power converter.
12. the controller circuitry of a switch type power converter comprises:
One multiplexer is set so that a low level output signal to be provided when starting, and the output signal of a high level is provided after starting a period of time;
One clock generator is set and with the output signal according to this multiplexer one clock signal is provided; And
One Pwm controller is set according to this clock signal one pulse width modulating signal to be provided.
13. controller circuitry according to claim 12, wherein this clock generator comprises:
One first electric capacity;
One first switch is in order to be connected to one first current source to charge to this first electric capacity;
One second switch is in order to be connected to one second current source to be directed against this first capacitor discharge;
One first hysteresis comparator, its input be connected to this first electric capacity, one first reference voltage and one second reference voltage and, in order to this clock signal to be provided, and according to this first switch of the mutual conducting of this clock signal and this second switch.
14. controller circuitry according to claim 12, it further comprises:
One vibration circuit is set to provide a dither signal to this clock generator; And
One comparator is set with relatively this dither signal and a reference signal, and is controlled this multiplexer in view of the above;
Wherein, this low level output signal is this dither signal.
15. controller circuitry according to claim 14, wherein this vibration circuit comprises:
One second electric capacity, its voltage level is this dither signal;
One the 3rd current source, set with this dither signal during less than this reference signal to this second electric capacity charging;
One the 3rd switch is in order to be connected to one the 4th current source to charge to this second electric capacity;
One the 4th switch is in order to be connected to one the 5th current source to be directed against this second capacitor discharge; And
One second hysteresis comparator, its input are connected to this second electric capacity, one the 3rd reference voltage and one the 4th reference voltage, and set with at this dither signal mutual conducting the 3rd switch and the 4th switch during greater than this reference signal.
16. controller circuitry according to claim 14, wherein this clock generator further comprises:
One the 3rd electric capacity;
One comparator is set to carry out the charge redistribution of this first electric capacity and the 3rd electric capacity according to this dither signal.
17. controller circuitry according to claim 12, wherein the output signal of this high level is a feedback compensation signal.
18. controller circuitry according to claim 12, wherein this low level output signal is to make this clock generator export the clock signal of a low-limit frequency.
19. controller circuitry according to claim 12, wherein the output signal of this high level is to make this clock generator export the clock signal of a highest frequency.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110158584.1A CN102832817B (en) | 2011-06-14 | 2011-06-14 | Control the method and its circuit of the power switch cross-pressure of switch type power converter |
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|---|---|---|---|
| CN201110158584.1A CN102832817B (en) | 2011-06-14 | 2011-06-14 | Control the method and its circuit of the power switch cross-pressure of switch type power converter |
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| CN102832817B CN102832817B (en) | 2017-07-21 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103780097A (en) * | 2014-02-25 | 2014-05-07 | 成都芯源系统有限公司 | Switching power converter, clock module, control circuit and related control method |
| CN104283619A (en) * | 2013-07-10 | 2015-01-14 | 欧司朗有限公司 | Signal transmission method and related device |
| EP4064541A1 (en) * | 2021-03-25 | 2022-09-28 | Infineon Technologies Austria AG | Power supply monitoring and switching frequency control |
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| CN1826719A (en) * | 2003-07-07 | 2006-08-30 | 汤姆森特许公司 | Switched mode power supply |
| CN201435598Y (en) * | 2008-10-29 | 2010-03-31 | Bcd半导体制造有限公司 | Short-circuit protective circuit of switch power supply PWM controller |
| CN101997541A (en) * | 2009-08-17 | 2011-03-30 | 通嘉科技股份有限公司 | Frequency jitter device and method and power management device |
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2011
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| CN1826719A (en) * | 2003-07-07 | 2006-08-30 | 汤姆森特许公司 | Switched mode power supply |
| CN201435598Y (en) * | 2008-10-29 | 2010-03-31 | Bcd半导体制造有限公司 | Short-circuit protective circuit of switch power supply PWM controller |
| CN101997541A (en) * | 2009-08-17 | 2011-03-30 | 通嘉科技股份有限公司 | Frequency jitter device and method and power management device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104283619A (en) * | 2013-07-10 | 2015-01-14 | 欧司朗有限公司 | Signal transmission method and related device |
| US9413247B2 (en) | 2013-07-10 | 2016-08-09 | Osram Gmbh | Signal transmission method and related device |
| CN103780097A (en) * | 2014-02-25 | 2014-05-07 | 成都芯源系统有限公司 | Switching power converter, clock module, control circuit and related control method |
| CN103780097B (en) * | 2014-02-25 | 2017-12-29 | 成都芯源系统有限公司 | Switching power converter, clock module, control circuit and related control method |
| EP4064541A1 (en) * | 2021-03-25 | 2022-09-28 | Infineon Technologies Austria AG | Power supply monitoring and switching frequency control |
| US11689103B2 (en) | 2021-03-25 | 2023-06-27 | Infineon Technologies Austria Ag | Power supply monitoring and switching frequency control |
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|---|---|
| CN102832817B (en) | 2017-07-21 |
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