CN100559686C - Produce the method and apparatus and the application thereof of pulse width modulating signal - Google Patents
Produce the method and apparatus and the application thereof of pulse width modulating signal Download PDFInfo
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- CN100559686C CN100559686C CNB2006101393268A CN200610139326A CN100559686C CN 100559686 C CN100559686 C CN 100559686C CN B2006101393268 A CNB2006101393268 A CN B2006101393268A CN 200610139326 A CN200610139326 A CN 200610139326A CN 100559686 C CN100559686 C CN 100559686C
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Abstract
A kind of method and apparatus that produces pulse width modulating signal, and the method and apparatus of using this generation pulse width modulating signal carries out power conversion method and power supply changeover device, comprise that comparison one error signal and the linear ramp signal of a vibration produce a pulse width modulating signal, wherein, this pulse width modulating signal provides a duty cycle information, modulate the slope of this linear ramp signal that vibrates or the accurate position of this error signal according to this, and then modulate this duty ratio.So, the transient response of this power supply changeover device and the stability in pulse width modulation loop have been improved.
Description
Technical field
The present invention is about a kind of power conversion method and power supply changeover device, particularly about a kind of pulse width modulation (Pulse Width Modulation that is applied to power conversion method and power supply changeover device; PWM) signal generating method and device.
Background technology
As shown in Figure 1, in typical PWM power supply changeover device 100, error amplifier 102 is a feedback voltage Vfb of deriving from output end vo ut and a reference voltage Vref and produce an error signal EO relatively, pulse-width modulator 106 relatively produces a pwm signal with the linear ramp signal RAMP of vibration of the fixed slope of this error signal EO and a ramp signal generator 104 generations, through gate drivers 108 switching transistor M1 and M2, this pwm signal has a work period (duty), the conducting (on) of decision transistor M1 and M2 with close (off) time, thereby regulate output voltage V out.The ratio of the amplitude of the input voltage vin of power supply changeover device 100 and ramp signal RAMP, i.e. Vin/Vramp, but the modulation gain of PWM (modulationgain) for this reason, the reaction speed and the stability in itself and PWM loop are in close relations.Again because the loop gain (loop gain) of power supply changeover device 100 but be proportional to by the gain of the feedback factor of resistance R 1, R2, R3, R4 and capacitor C 1, compensating circuit that C2, C3 constituted, error amplifier 102 and modulation gain three's product, i.e. (Vref/Vout) * (Vin/Vramp), so, but modulation gain can influence the transient response of power supply changeover device 100.
Fig. 2 is the variation schematic diagram of many signals in Fig. 1 circuit.When time t1, because input voltage vin descends suddenly or output voltage V out suffers load to extract a large amount of electric currents and descend suddenly, cause feedback voltage Vfb to reduce, therefore cause the difference between feedback voltage Vfb and the reference voltage Vref to become big, error signal EO raises up since time t1 thereupon significantly.When time t2, because being increased to constantly, error signal EO is higher than ramp signal RAMP, so pwm signal is converted to high levle by low level.When pwm signal during at high levle, transistor M1 conducting and transistor M2 close, and power supply Vin charges to output end vo ut.To during time t 3, because output voltage V out begins to go up gradually, so feedback voltage Vfb is also along with rise, up to the accurate position of original maintenance.The oscillogram of Fig. 2 summarily demonstrates transient response (transient response) process of transducer 100.
But, there have been many known technologies to be suggested in order to improve the stability of modulation gain.In No. the 6522115th, United States Patent (USP), be to use nonlinear ramp signal, but this way need detect inductive current, therefore need many pin positions of detecting electric current, cause the waste of integrated circuit (IC) pin position, also more bad design of pwm circuit or modification.In No. the 6593725th, United States Patent (USP), be with pulse signal producer control ramp signal and pulse width modulating signal, but the input voltage of necessary sensing power supply changeover device, and circuit becomes too complicated.And in No. the 6049473rd, United States Patent (USP),, also need the input voltage of sensing power supply changeover device simultaneously not only with pulse width modulating signal control non-linear ramp signal generator.
Therefore, a kind of input voltage that does not need the sensing power supply changeover device can improve the method and apparatus of the stability and the reaction speed in PWM loop, and is real in everybody expected.
Summary of the invention
One of purpose of the present invention is to propose a kind of method and apparatus that produces pwm signal.
One of purpose of the present invention is to propose a kind of PWM power conversion method and power supply changeover device.
One of purpose of the present invention is to propose the method and apparatus of a kind of PWM of improvement power supply changeover device transient response.
One of purpose of the present invention is to propose the method and apparatus of a kind of PWM of improvement loop stability.
One of purpose of the present invention is to propose the method and apparatus that a kind of input voltage that need not detect the loop can achieve the above object.
According to the present invention, a kind of method that produces pwm signal comprises from a pwm signal and obtains a duty cycle information, modulate the accurate position of an error signal or the slope of the linear ramp signal of a vibration according to this, and relatively this error signal and this linear ramp signal that vibrates produce this pwm signal, so as to modulating the duty ratio of this pwm signal.
According to the present invention, a kind of device that produces pwm signal comprises that one first circuit is in order to relatively an error signal and the linear ramp signal of a vibration produce a pwm signal, and one second circuit in order to obtain a duty cycle information from this pwm signal, the accurate position of modulating this error signal according to this is the slope of the linear ramp signal of this vibration maybe, so as to modulating the duty ratio of this pwm signal.
According to the present invention, a kind of power conversion method comprises that comparison one and output voltage dependent feedback signal and a reference signal are to produce an error signal, relatively this error signal and the linear ramp signal of a vibration are to produce a pwm signal, the accurate position of modulating this error signal according to the duty cycle information of this pwm signal is the slope of the linear ramp signal of this vibration maybe, modulating the duty ratio of this pwm signal, and switch circuit with this pwm signal one supply voltage is converted to this output voltage.
According to the present invention, a kind of power supply changeover device comprise an error amplifier in order to relatively one with output voltage dependent feedback signal and a reference signal to produce an error signal, one pulse-width modulator in order to this error signal relatively and the linear ramp signal of a vibration to produce a pwm signal with a duty ratio, one feedforward (feed-forward) circuit provides a duty cycle information to this pulse-width modulator in order to produce a feed-forward signal from this pwm signal, and a switching circuit is converted to this output voltage in response to this pwm signal with a supply voltage.
The accurate position of the slope of linear ramp signal or error signal changes along with the change of the duty ratio of pwm signal because vibrate, so improved the stability and the reaction speed in PWM loop, has also improved the transient response of power supply changeover device.
Description of drawings
Fig. 1 is known PWM transducer;
Fig. 2 is the variation schematic diagram of many signals in Fig. 1 circuit;
Fig. 3 is embodiment one of according to the present invention;
Fig. 4 is an embodiment of the PWM transducer of Fig. 3;
Fig. 5 is the flow chart according to a transfer process of the present invention;
Fig. 6 is that explanation changes the schematic diagram of the slope of the linear ramp signal of vibration with the duty ratio D of change pwm signal;
Fig. 7 is according to another embodiment of the present invention; And
Fig. 8 is an embodiment of the PWM transducer of Fig. 7.
Symbol description:
100PWM power supply changeover device 102 error amplifiers
104 ramp signal generators, 106 pulse-width modulators
108 gate drivers 200PWM power supply changeover devices
202 error amplifiers, 204 ramp signal generators
2042 switches, 206 pulse-width modulators
208 gate drivers, 210 duty ratio voltage conversion circuits
2102 current sources, 2104 switches
212 feed forward circuits, 2122 samplers
2124 low pass filters, 2126 analog dividers and current converter
214 oscillators, 300 steps
310 step 320 steps
330 step 400PWM power supply changeover devices
402 error amplifiers, 404 ramp signal generators
406 pulse-width modulators, 408 gate drivers
410 circuit, 412 adders
414 duty ratio voltage conversion circuits, 416 feed forward circuits
Embodiment
One embodiment of the invention, as shown in Figure 3, PWM power supply changeover device 200 is similar to the known PWM power supply changeover device 100 of Fig. 1, difference is: it has a duty ratio voltage conversion circuit 210 is the voltage V (D) of a linear correlation with the size conversion of the duty ratio D of pwm signal, one feed forward circuit 212 is converted to a feed-forward signal FF with this voltage V (D), and a ramp signal generator 204 produces the linear ramp signal RAMP of a vibration to pulse-width modulator 206 according to oscillator signal OSC and this feed-forward signal FF that an oscillator 214 provides.In this embodiment, the slope of the linear ramp signal RAMP that vibrates is by feed-forward signal FF modulation, and just by duty ratio D modulation, the slope of the linear ramp signal RAMP that therefore vibrates changes along with the change of duty ratio D.
Owing to directly obtain duty ratio D from pwm signal, therefore the slope of the linear ramp signal RAMP of modulating oscillation has improved the transient response of PWM power supply changeover device 200 according to this.Again because can change the slope of the linear ramp signal RAMP of vibration, but thereby make modulation gain also can and then change.When output voltage V out was low, duty ratio D was also lower, if the slope of the linear ramp signal RAMP of vibration is at this moment strengthened, but then can reduce modulation gain, and is helpful to stability.Especially, above-mentioned control procedure does not need to detect input voltage vin.
Fig. 4 is an embodiment of duty ratio voltage conversion circuit 210, feed forward circuit 212 and the ramp signal generator 204 of Fig. 3.In duty ratio voltage conversion circuit 210, one current source, 2102 supplies, one charging current Iosc, one switch 2104 is subjected to the control of pwm signal and conducting or cut out, make capacitor C 4 be recharged electric current I osc charging and produce voltage V (D), 2122 couples of voltage V of a sampler (sample/hold) (D) take a sample and produce voltage after the sampling.In feed forward circuit 212, from the voltage after the sampling of duty ratio voltage conversion circuit 210 through a low pass filter (low pass filter) 2124 filtering noises, then an analog divider and current converter (analog divider and current transformer) 2126 with the voltage after the filtering divided by a constant and convert electric current I to.In this embodiment, aforesaid feed-forward signal FF is an electric current I.In ramp signal generator 204, two transistor m1 and m2 form a current mirror, the mirror electric current I is to capacitor C 5 charging, and a switch 2042 is subjected to from the oscillator signal OSC control of oscillator 214 and conducting or cut out, thereby makes capacitor C 5 produce the linear ramp signal RAMP of vibration.Briefly, when the duty ratio of pwm signal is big more, the time that capacitor C 4 is recharged is long more, therefore the charging voltage V (D) on it is big more, cause electric current I more little, cause the charging voltage rising on the capacitor C 5 slow more, that is the slope of the linear ramp signal RAMP that vibrates is more little.The more detailed description such as the following derivation of equation.
Suppose the time that the linear ramp signal RAMP of t representative vibration rises, T represents switching cycle, and D is as aforementioned representative duty ratio and equal Vout/Vin, then
T=D * T [formula 1]
And capacitor C 4 is recharged the voltage that electric current I osc charging produces
V(D)＝(Iosc/C4)×t
=(Iosc/C4) * D * T [formula 2]
By formula 2 voltage V (D) and duty ratio D linear correlation as can be known.The electric current that voltage V (D) produces divided by a constant A and conversion via analog divider and current converter 2126 again
I＝1/(V(D)/A)
=C4 * A/Iosc * D * T=f1 (D) [formula 3]
Electric current I and voltage V (D) are inversely proportional to and are the function of duty ratio D.And capacitor C 5 is borrowed the amplitude of the linear ramp signal RAMP of the electric current I vibration that charging produces
Vramp＝(I/C5)×T
＝(C4×A×T)/(Iosc×D×T×C5)
＝(C4×A)/(Iosc×D×C5)＝f2(D)
=(C4 * A * Vin)/(Iosc * C5 * Vout) [formula 4]
Vramp also is the function of duty ratio D.Because the frequency of the linear ramp signal RAMP of vibration is by oscillator 214 controls, so its slope also is inversely proportional to duty ratio D.But and modulation gain
Vin/Vramp=(Iosc * C5 * Vout)/(C4 * A) [formula 5]
Therefore, if output voltage V out fixes, but then modulation gain is also fixing.And loop gain is proportional to
(Vin/Vramp) * (Vref/Vout)=(Iosc * C5 * Vref)/(C4 * A) [formula 6]
Therefore loop gain is a definite value, and is irrelevant with input voltage vin and output voltage V out.
In different embodiment, duty ratio voltage conversion circuit 210 can be borrowed the size of the size decision charging current Iosc of duty ratio D, and then the generation voltage V (D) relevant with duty ratio D.In different embodiment, feed forward circuit 212 also can use integrator or other circuit to produce the electric current I relevant with duty ratio D.
Fig. 4 provides a preferred embodiment that produces the linear ramp signal RAMP of vibration, transfer process is shown in the flow chart of Fig. 5 widely, step 300 obtains the information of its duty ratio D from a pwm signal, step 310 produces a voltage V (D) according to the information of this duty ratio D, the size of this voltage V (D) is determined by this duty ratio D, step 320 conversion this voltage V (D) becomes a function f (D) relevant with this duty ratio D, linear function for example, piecewise linear function, logarithmic function, exponential function, power power function, trigonometric function or other nonlinear function, step 330 produces the linear ramp signal RAMP of a vibration according to this function f (D), and the slope of this linear ramp signal RAMP that vibrates is by the value decision of this function f (D).In different embodiment, the information that step 310 also can change into according to this duty ratio D produces an electric current I (D), and changing this electric current I (D) according to this by step 320 again becomes a function f (D) relevant with this duty ratio D.Duty ratio D is converted to voltage V (D) relevant with this duty ratio D or electric current I (D), further be converted to function f (D) again, slope with modulating oscillation linear ramp signal RAMP, it is fairly simple way, in different embodiment, also can directly determine the slope of the linear ramp signal RAMP of vibration from the size of duty ratio D.
Fig. 6 is used for illustrating how the slope that changes the linear ramp signal RAMP of vibration changes the duty ratio D of pwm signal.When input voltage vin becomes big or output voltage V out when diminishing, when the slope of linear ramp signal RAMP of vibrating was big, its speed with the mutual convergence of error signal EO was very fast, so the two intermeshes morning, cause pwm signal shorter in the time of high levle, just its duty ratio D is less.Otherwise, when input voltage vin diminishes or output voltage V out when becoming big, when the slope of linear ramp signal RAMP of vibrating diminishes, shown in the dotted line among Fig. 6, the speed of itself and the mutual convergence of error signal EO is slack-off, therefore the two time that intermeshes is delayed, and causes pwm signal to increase in the time of high levle, and just duty ratio D has increased.Error signal EO still remains unchanged when stable state.
It is a kind of mode of the present invention that previous embodiment is come the duty ratio D of modulation (PWM) signal via the slope that changes the linear ramp signal RAMP of vibration, the personage who knows this skill is when understanding, in different embodiment, also can reach identical purpose via the accurate position of duty ratio D being feedovered with modulation error signal EO.Fig. 7 is an alternative embodiment of the invention, in PWM power supply changeover device 400, circuit 410 is obtained the information of duty ratio D from pwm signal, produces a feed-forward signal FF according to this and combines with error signal EO, thereby the accurate position of modulation error signal EO, and then the duty ratio D of modulation (PWM) signal.In one embodiment, feed-forward signal FF is the size of duty ratio D and the product of an index of modulation β, and error signal EO deducts feed-forward signal FF through an adder 412, the error signal after formation one modulation
EO '=EO-FF=EO-β * D [formula 7]
It changes along with the size of duty ratio D.Error signal EO ' after this modulation relatively produces pwm signal via pulse-width modulator 406 with the linear ramp signal RAMP of vibration.Error signal EO ' after the modulation equal the to vibrate amplitude Vramp of linear ramp signal RAMP multiply by duty ratio D, promptly
EO '=Vramp * D [formula 8]
Can obtain error signal from formula 7 and formula 8
EO＝Vramp×D+β×D
＝(Vramp+β)×D
=(Vramp+ β) * (Vout/Vin) [formula 9]
Again, but modulation gain Vin/Vramp=Vout/EO, but therefore from formula 9 can push away modulation gain
Vout/EO＝Vout/((Vramp+β)×(Vout/Vin))
=Vin/ (Vramp+ β) [formula 10]
Make Vramp+ that β is proportional to 1/D, that is
Vramp+ β=α (1/D) [formula 11]
Wherein, α is a constant.From formula 10 and formula 11, but modulation gain
Vout/EO＝Vin/(Vramp+β)
＝Vin×D/α
=Vout/ α [formula 12]
Therefore, if output voltage V out fixes, but then modulation gain is also fixing.And loop gain is proportional to
(Vin/Vramp)×(Vref/Vout)＝(Vout/EO)×(Vref/Vout)
＝(Vin×D/α)×(Vref/Vout)
＝D×(Vin/Vout)×(Vref/α)
=Vref/ α [formula 13]
Therefore, loop gain is fixed, and is irrelevant with input voltage vin and output voltage V out.
Can derive the index of modulation from formula 11
β=α (1/D)-Vramp [formula 14]
An embodiment of Fig. 8 display circuit 410 comprises that duty ratio voltage conversion circuit 414 is the voltage V (D) of linear correlation with the size conversion of the duty ratio D of pwm signal, and feed forward circuit 416 produces feed-forward signal FF according to voltage V (D) with the Vramp computing.In other embodiments, feed-forward signal FF also can reach identical purpose according to linear function, piecewise linear function, logarithmic function, exponential function, power power function, trigonometric function or other nonlinear function of duty ratio D.
As technical field herewith the personage understood, also feed-forward signal FF can be combined with reference signal Vref or feedback signal Vfb, and reach the purpose of modulation error signal EO.Therefore, in different embodiment,, just can obtain identical result as long as revise the part circuit of Fig. 7 or Fig. 8.
As shown in the various embodiments described above, directly obtain the input of the information generation feed-forward signal FF modulating pulse width modulator of duty ratio D from pwm signal, can accelerate the transient response of PWM power supply changeover device, improve the stability in PWM loop simultaneously.
Claims (59)
1. method that produces pulse width modulating signal, this pulse width modulating signal has a duty ratio of being modulated, and this method comprises the following steps:
Obtain a duty cycle information from this pulse width modulating signal;
According to the linear ramp signal of this duty cycle information modulation one vibration; And
Relatively an error signal and this linear ramp signal that vibrates produce this pulse width modulating signal, so as to modulating this duty ratio.
2. the method for claim 1 should comprise wherein producing a feed-forward signal that it was the function of this duty ratio from step that this pulse width modulating signal is obtained a duty cycle information.
3. method as claimed in claim 2, wherein this feed-forward signal is linear function, piecewise linear function, logarithmic function, exponential function, power power function or the trigonometric function of this duty ratio.
4. the method for claim 1 wherein should comprise the slope of modulating this linear ramp signal that vibrates according to the step of the linear ramp signal of this duty cycle information modulation one vibration.
5. the method for claim 1, wherein the linear ramp signal of this vibration has the function that a slope is this duty ratio.
6. the method for claim 1, wherein the size of the linear ramp signal of this vibration with a slope and this duty ratio is inversely proportional to.
7. method that produces pulse width modulating signal, this pulse width modulating signal has a duty ratio of being modulated, and this method comprises the following steps:
Obtain a duty cycle information from this pulse width modulating signal;
Modulate an error signal according to this duty cycle information; And
Relatively this error signal and the linear ramp signal of a vibration produce this pulse width modulating signal, so as to modulating this duty ratio.
8. method as claimed in claim 7, wherein this step of modulating an error signal according to this duty cycle information comprises that producing a feed-forward signal modulates this error signal, it is the function of this duty ratio.
9. method as claimed in claim 8, wherein this feed-forward signal is linear function, piecewise linear function, logarithmic function, exponential function, power power function or the trigonometric function of this duty ratio.
10. method as claimed in claim 8, wherein this feed-forward signal is the size of this duty ratio and the product of an index of modulation.
11. method as claimed in claim 8, wherein this generation one feed-forward signal step of modulating this error signal comprises the accurate position of this error signal of modulation.
12. method as claimed in claim 7, wherein to have surely the position be the function of this duty ratio to this error signal.
13. a device that produces pulse width modulating signal comprises:
The linear ramp signal generator of one vibration is in order to produce the linear ramp signal of a vibration;
One first circuit produces this pulse width modulating signal in order to compare an error signal and this linear ramp signal that vibrates, and this pulse width modulating signal has a duty ratio of being modulated; And
One second circuit is in order to obtain a duty cycle information from this pulse width modulating signal, to modulate this linear ramp signal that vibrates, so as to modulating this duty ratio.
14. as the device of claim 13, wherein this second circuit produces a feed-forward signal according to this pulse width modulating signal, it is the function of this duty ratio, in order to this duty cycle information to be provided.
15. device as claimed in claim 14, wherein this second circuit comprises:
One first change-over circuit is a voltage with the size conversion of this duty ratio; And
One second change-over circuit, from this voltage transitions be an electric current as this feed-forward signal, the size of this electric current is the value of this function.
16. device as claimed in claim 15, wherein the size of this voltage and this duty ratio is a linear correlation.
17. device as claimed in claim 15, wherein this electric current and this voltage are inversely proportional to.
18. device as claimed in claim 15, wherein this first change-over circuit comprises:
One current source is in order to supply a charging current; And
One electric capacity is borrowed this charging current for charging, and to produce this voltage, its size is by the size decision of this duty ratio.
19. device as claimed in claim 18, wherein the size of this charging current is by the size decision of this duty ratio.
20. device as claimed in claim 18, wherein time of being recharged of this electric capacity is by the size decision of this duty ratio.
21. device as claimed in claim 15, the linear ramp signal generator of described vibration has an electric capacity, borrows this current charges to produce this linear ramp signal that vibrates.
22. device as claimed in claim 15 also comprises:
One current mirror, this electric current of mirror produces a proportional current;
The linear ramp signal generator of described vibration has an electric capacity, borrows this proportional current charging to produce this linear ramp signal that vibrates.
23. device as claimed in claim 15, wherein this second change-over circuit comprises a sampler, and this voltage is taken a sample.
24. device as claimed in claim 15, wherein this second change-over circuit comprises an analog divider and current converter, is this electric current with this voltage transitions.
25. device as claimed in claim 14, wherein this feed-forward signal is used for modulating the slope of this linear ramp signal that vibrates.
26. device as claimed in claim 25, wherein the slope of the linear ramp signal of this vibration is the function of this duty ratio.
27. device as claimed in claim 25, wherein the slope of the linear ramp signal of this vibration and this duty ratio are inversely proportional to.
28. a device that produces pulse width modulating signal comprises:
The linear ramp signal generator of one vibration is in order to produce the linear ramp signal of a vibration;
One first circuit produces this pulse width modulating signal in order to compare an error signal and this linear ramp signal that vibrates, and this pulse width modulating signal has a duty ratio of being modulated; And
One second circuit is in order to obtain a duty cycle information from this pulse width modulating signal, to modulate this error signal, so as to modulating this duty ratio.
29. device as claimed in claim 28, wherein this second circuit produces a feed-forward signal according to this pulse width modulating signal, and it is the function of this duty ratio, in order to this duty cycle information to be provided.
30. device as claimed in claim 29, wherein this feed-forward signal is used for modulating the accurate position of this error signal.
31. device as claimed in claim 30, wherein this second circuit comprises:
One first change-over circuit is a voltage with the size conversion of this duty ratio; And
One second change-over circuit produces this feed-forward signal from this voltage.
32. device as claimed in claim 30, wherein this feed-forward signal is the product of this duty ratio and an index of modulation.
33. a power conversion method, in order to produce an output voltage, this method comprises the following steps:
Generation one and this output voltage dependent feedback signal;
Relatively this feedback signal and a reference signal are to produce an error signal;
Relatively this error signal and one the vibration linear ramp signal, to produce a pulse width modulating signal;
Obtain a duty cycle information from this pulse width modulating signal;
Modulate this linear ramp signal that vibrates according to this duty cycle information, to modulate this duty ratio; And
Switch circuit with this pulse width modulating signal, change out this output voltage from a supply voltage.
34. method as claimed in claim 33 wherein should obtain a duty from this pulse width modulating signal
Step than information comprises generation one feed-forward signal, and it is the function of this duty ratio.
35. method as claimed in claim 34, wherein this step of modulating this linear ramp signal that vibrates according to this duty cycle information comprises the slope of modulating this linear ramp signal that vibrates.
36. method as claimed in claim 35, wherein the slope of the linear ramp signal of this vibration is the function of this duty ratio.
37. method as claimed in claim 35, wherein the slope of the linear ramp signal of this vibration and this duty ratio are inversely proportional to.
38. a power conversion method, in order to produce an output voltage, this method comprises the following steps:
Generation one and this output voltage dependent feedback signal;
Relatively this feedback signal and a reference signal are to produce an error signal;
Relatively this error signal and one the vibration linear ramp signal, to produce a pulse width modulating signal;
Obtain a duty cycle information from this pulse width modulating signal;
Modulate this error signal according to this duty cycle information, to modulate this duty ratio; And
Switch circuit with this pulse width modulating signal, change out this output voltage from a supply voltage.
39. method as claimed in claim 38, wherein this step that obtains a duty cycle information from this pulse width modulating signal comprises generation one feed-forward signal, and it is the function of this duty ratio.
40. method as claimed in claim 39, wherein this step of modulating this error signal according to this duty cycle information comprises the accurate position of modulating this error signal.
41. method as claimed in claim 39, wherein this feed-forward signal is the product of this duty ratio and an index of modulation.
42. a power supply changeover device, in order to produce an output voltage, this power supply changeover device comprises:
One feedback circuit, in order to produce one with this output voltage dependent feedback signal;
One error amplifier is in order to relatively this feedback signal and a reference signal, to produce an error signal;
The linear ramp signal generator of one vibration is in order to produce the linear ramp signal of a vibration;
One pulse-width modulator is in order to relatively this error signal and this linear ramp signal that vibrates, to produce a pulse width modulating signal with a duty ratio;
One feed forward circuit, in order to produce a feed-forward signal from this pulse width modulating signal, it is the function of this duty ratio, and modulates this linear ramp signal that vibrates by this feed-forward signal; And
One switches circuit, switches in response to this pulse width modulating signal, changes out this output voltage from a supply voltage.
43. power supply changeover device as claimed in claim 42, wherein this feed forward circuit comprises:
One first change-over circuit is a voltage with the size conversion of this duty ratio; And
One second change-over circuit, from this voltage transitions be an electric current as this feed-forward signal, the size of this electric current is the value of this function.
44. power supply changeover device as claimed in claim 43, wherein the size of this voltage and this duty ratio is a linear correlation.
45. power supply changeover device as claimed in claim 43, wherein this electric current and this voltage are inversely proportional to.
46. power supply changeover device as claimed in claim 43, wherein this first change-over circuit comprises:
One current source is in order to supply a charging current; And
One electric capacity is borrowed this charging current for charging, and to produce this voltage, its size is by the size decision of this duty ratio.
47. power supply changeover device as claimed in claim 46, wherein the size of this charging current is by the size decision of this duty ratio.
48. power supply changeover device as claimed in claim 46, wherein time of being recharged of this electric capacity is by the size decision of this duty ratio.
49. power supply changeover device as claimed in claim 43, the linear ramp signal generator of described vibration has an electric capacity, borrows this current charges to produce this linear ramp signal that vibrates.
50. power supply changeover device as claimed in claim 43 also comprises:
One current mirror, this electric current of mirror produces a proportional current;
The linear ramp signal generator of described vibration has an electric capacity, borrows this proportional current charging to produce this linear ramp signal that vibrates.
51. power supply changeover device as claimed in claim 43, wherein this second change-over circuit comprises a sampler, in order to this voltage is taken a sample.
52. power supply changeover device as claimed in claim 43, wherein this second change-over circuit comprises an analog divider and current converter, is this electric current with this voltage transitions.
53. power supply changeover device as claimed in claim 42, it has a modulation gain is constant.
54. power supply changeover device as claimed in claim 42, it has a loop gain is constant.
55. a power supply changeover device, in order to produce an output voltage, this power supply changeover device comprises:
One feedback circuit, in order to produce one with this output voltage dependent feedback signal;
One error amplifier is in order to relatively this feedback signal and a reference signal, to produce an error signal;
The linear ramp signal generator of one vibration is in order to produce the linear ramp signal of a vibration;
One pulse-width modulator is in order to relatively this error signal and this linear ramp signal that vibrates, to produce a pulse width modulating signal with a duty ratio;
One feed forward circuit, in order to produce a feed-forward signal from this pulse width modulating signal, it is the function of this duty ratio, and modulates this error signal by this feed-forward signal; And
One switches circuit, switches in response to this pulse width modulating signal, changes out this output voltage from a supply voltage.
56. power supply changeover device as claimed in claim 55 also comprises an adder, and this error signal is deducted this feed-forward signal, to modulate the accurate position of this error signal.
57. power supply changeover device as claimed in claim 56, wherein this feed-forward signal is the product of this duty ratio and an index of modulation.
58. power supply changeover device as claimed in claim 55, it has a modulation gain is constant.
59. power supply changeover device as claimed in claim 55, it has a loop gain is constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101393268A CN100559686C (en) | 2006-09-22 | 2006-09-22 | Produce the method and apparatus and the application thereof of pulse width modulating signal |
Applications Claiming Priority (1)
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| CN103236791B (en) * | 2008-08-21 | 2016-01-20 | 立锜科技股份有限公司 | Improve PWM power supply changeover device and the control method thereof of dynamic response |
| US8810221B2 (en) * | 2009-06-18 | 2014-08-19 | The Board Of Regents, The University Of Texas System | System, method and apparatus for controlling converters using input-output linearization |
| CN101795070B (en) * | 2010-04-02 | 2012-09-05 | 日银Imp微电子有限公司 | System for linearly adjusting slope compensation voltage slope |
| US8467197B2 (en) * | 2010-11-08 | 2013-06-18 | GM Global Technology Operations LLC | Systems and methods for compensating for electrical converter nonlinearities |
| US8860379B2 (en) | 2011-04-20 | 2014-10-14 | GM Global Technology Operations LLC | Discharging a DC bus capacitor of an electrical converter system |
| US8829858B2 (en) * | 2011-05-31 | 2014-09-09 | GM Global Technology Operations LLC | Systems and methods for initializing a charging system |
| US8629649B2 (en) * | 2011-07-14 | 2014-01-14 | O2Micro International, Ltd. | Battery charging apparatus with a common control loop for a low drop-out voltage regulator and a boost regulator |
| US8878495B2 (en) | 2011-08-31 | 2014-11-04 | GM Global Technology Operations LLC | Systems and methods for providing power to a load based upon a control strategy |
| TWI441005B (en) | 2012-05-24 | 2014-06-11 | Richtek Technology Corp | Constant on time mode power supplier for improving load transient and method thereof |
| FR2995747B1 (en) * | 2012-09-14 | 2014-09-19 | I T H P P | HIGH STRENGTHLY HIGH QUADRANGULAR SHAPE POWER PULSE GENERATOR WITH ADJUSTABLE SLOPE |
| US9770991B2 (en) | 2013-05-31 | 2017-09-26 | GM Global Technology Operations LLC | Systems and methods for initializing a charging system |
| CN104485941A (en) * | 2014-12-23 | 2015-04-01 | 上海数明半导体有限公司 | Conversion circuit |
| US9893621B1 (en) * | 2016-10-26 | 2018-02-13 | Silanna Asia Pte Ltd | Power converter with predictive pulse width modulator control |
| CN108390426B (en) * | 2018-02-07 | 2020-11-20 | 深圳市创新微源半导体有限公司 | Novel lithium battery charging control circuit |
| CN113067555B (en) * | 2021-06-03 | 2021-09-03 | 上海芯龙半导体技术股份有限公司 | Gain compensation circuit of error amplifier and switching power supply |
| CN117353431B (en) * | 2023-12-06 | 2024-02-20 | 苏州贝克微电子股份有限公司 | Circuit structure with adjustable duty ratio |
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