CN104104230A - Control circuit of power conversion circuit - Google Patents
Control circuit of power conversion circuit Download PDFInfo
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- CN104104230A CN104104230A CN201310112502.9A CN201310112502A CN104104230A CN 104104230 A CN104104230 A CN 104104230A CN 201310112502 A CN201310112502 A CN 201310112502A CN 104104230 A CN104104230 A CN 104104230A
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Abstract
The invention provides a control circuit of a power conversion circuit; the control circuit comprises the following structures: a period signal generation circuit used for generating a first filter signal, a second filter signal and a period signal according to a second feedback signal matched with an induction voltage of the power conversion circuit; a comparison circuit used for comparing an error signal with the period signal so as to generate a comparison signal; a control signal generation circuit used for generating a control signal according to the comparison signal so as to control a power switch of the power conversion circuit; a signal adjusting circuit. In a load transient process in which the load of the power conversion circuit is switched from a light load to heavy load, when a lower bridge switch of the power conversion circuit is conducted, the signal adjusting circuit can reduce output current of the period signal generation circuit, thus accelerating loop response of the power conversion circuit.
Description
Technical field
The relevant power-switching circuit of the present invention, the control circuit of the power switch deadline in espespecially a kind of dynamic adjustment power-switching circuit.
Background technology
In many electronic installations, often can utilize power-switching circuit to provide late-class circuit chip suitable operating voltage.Traditional power-switching circuit is transformed into by relative underloading in load in load transient (load transient) process of heavy duty relatively; often can cause the output voltage signal of power-switching circuit to increase and produce the problem of undershoot (undershoot) because load is unexpected, and then cause power-switching circuit cannot provide rapidly late-class circuit to operate required enough voltage or electric current.
One of traditional solution, is to increase the output capacitance size of power-switching circuit, to promote the stability of output voltage signal of power-switching circuit.But, increase output capacitance size and but will certainly increase integrated circuit area and the cost of power-switching circuit, and the loop response of power-switching circuit is also had to bad impact.
Summary of the invention
In view of this, how to avoid the output voltage signal of power-switching circuit because load increases suddenly the situation that produces undershoot, can not have influence on again the loop response of power-switching circuit and increase circuit area and cost, in fact for industry has problem to be solved.
This specification provides a kind of embodiment of control circuit of power-switching circuit, this power-switching circuit comprise bridge switch on, once bridge switch, with an inductance, it is characterized in that, this control circuit includes: a periodic signal produces circuit, be arranged to according to one second feedback signal produce one first filtering signal, one second filtering signal, with a periodic signal, wherein, the voltage on one first end points of this second feedback signal and this inductance is corresponding; One comparison circuit, is coupled to this periodic signal and produces circuit, and be arranged to comparison one reference signal and this periodic signal, to produce a comparison signal; One control signal produces circuit, is coupled to this comparison circuit, and is arranged to produce a control signal according to this comparison signal, to control the deadline of bridge switch on this; And a signal adjustment circuit, be coupled to this periodic signal and produce circuit and this comparison circuit; Wherein, be converted to by relative underloading in a load transient of heavy duty relatively in the load of this power-switching circuit, in the time of this lower bridge switch conducting, this signal adjustment circuit can downgrade the output current of this periodic signal generation circuit, with the loop response of accelerating power source change-over circuit.
This specification separately provides a kind of embodiment of control circuit of power-switching circuit, this power-switching circuit comprises an inductance, it is characterized in that, this control circuit includes: bridge switch on, its first end is for coupling an input voltage signal of this power-switching circuit, and on this second end of bridge switch for coupling one first end points of this inductance; Bridge switch once, its first end is coupled to the second end of bridge switch on this, and the second end of this lower bridge switch is coupled to a fixed potential end; One periodic signal produces circuit, be arranged to according to one second feedback signal produce one first filtering signal, one second filtering signal, with a periodic signal, wherein, the voltage on this first end points of this second feedback signal and this inductance is corresponding; One comparison circuit, is coupled to this periodic signal and produces circuit, and be arranged to comparison one reference signal and this periodic signal, to produce a comparison signal; One control signal produces circuit, is coupled to this comparison circuit, and is arranged to produce a control signal according to this comparison signal, to control the deadline of bridge switch on this; And a signal adjustment circuit, be coupled to this periodic signal and produce circuit and this comparison circuit; Wherein, be converted to by relative underloading in a load transient of heavy duty relatively in the load of this power-switching circuit, in the time of this lower bridge switch conducting, this signal adjustment circuit can be controlled this periodic signal and produce circuit and downgrade this periodic signal and produce the output current of circuit, with the loop response of accelerating power source change-over circuit.
One of advantage of above-described embodiment, is to be converted to by relative underloading in the load transient of heavy duty relatively in the load of power-switching circuit, can effectively avoid the output voltage signal of power-switching circuit to produce the problem of undershoot.
Another advantage of above-described embodiment, is without the output capacitance that increases power-switching circuit, also can not have influence on the loop response of power-switching circuit, therefore can promote the overall operation usefulness of power-switching circuit.
Other advantages of the present invention will explain orally in more detail by the following description and accompanying drawing.
Brief description of the drawings
Accompanying drawing described herein is used to provide further understanding of the present application, forms the application's a part, and the application's schematic description and description is used for explaining the application, does not form the improper restriction to the application.
Fig. 1 is the functional block diagram after the power-switching circuit of one embodiment of the invention is simplified.
Fig. 2 to Fig. 3 is the functional block diagram after the different embodiment of the periodic signal generation circuit in Fig. 1 simplify.
Fig. 4 to Fig. 6 is the functional block diagram after the different embodiment of the signal adjustment circuit in Fig. 1 simplify.
Embodiment
Below will coordinate relevant drawings that embodiments of the invention are described.In the accompanying drawings, identical label represents same or similar element or process step.
Please refer to Fig. 1, the functional block diagram after the power-switching circuit 100 that its illustrate is one embodiment of the invention is simplified.Power-switching circuit 100 includes control circuit 110, drive circuit 120, upper bridge switch 131, lower bridge switch 133, inductance 135 and feedback circuit 140.As shown in Figure 1, the first end of upper bridge switch 131 is for coupling the input voltage signal Vin of power-switching circuit, and the second end of upper bridge switch 131 is for coupling the first end points of inductance 135.The first end of lower bridge switch 133 is coupled to the second end of bridge switch, and the second end of lower bridge switch 133 is coupled to a fixed potential end, for example, and earth terminal.The second end points of inductance 135 is coupled to the output of power-switching circuit 100, so that output voltage signal Vout to be provided.
Drive circuit 120 is arranged to the control signal CTL producing according to control circuit 110, and bridge switch signal UG and lower bridge switch signal LG in generation, with the switching running of power ratio control switch 131 and 133.Feedback circuit 140 is coupled to the output of power-switching circuit 100, and is arranged to produce the first feedback signal FB corresponding with the output voltage signal Vout of power-switching circuit 100.
In implementation, drive circuit 120, upper bridge switch 131, lower bridge switch 133, feedback circuit 140 and/or compensating circuit 150 in power-switching circuit 100, can be the circuit being independent of respectively outside control circuit 110, also can be integrated in control circuit 110.In addition, upper bridge switch 131 can for example, be realized with the identical two transistor (, two PMOS transistors or two nmos pass transistors) of control logic with lower bridge switch 133.Or upper bridge switch 131 and lower bridge switch 133 also can be realized with the contrary two transistor of control logic.For example, can realize with PMOS transistor one of them of upper bridge switch 131 and lower bridge switch 133, and realize another power switch with nmos pass transistor.
As shown in Figure 1, the control circuit 110 in the present embodiment includes periodic signal generation circuit (periodical signal generating circuit) 113, comparison circuit (comparison circuit) 115, control signal generation circuit (control signal generating circuit) 117 and signal adjustment circuit (signal adjusting circuit) 119.
In the time that control circuit 110 is coupled to power-switching circuit 100, periodic signal produce circuit 113 can according to the second feedback signal VL produce the first filtering signal F1, the second filtering signal F2, with periodic signal Ramp.In the present embodiment, the voltage on the first end points of the second feedback signal VL and inductance 135 is corresponding.For example, the second feedback signal VL can be the voltage signal on this first end points of inductance 135, or the voltage on this first end points is through dividing potential drop or step-down signal after treatment.In implementation, aforesaid periodic signal Ramp can be triangular wave, string ripple signal, square-wave signal or the cyclical signal of extended formatting.
Comparison circuit 115 is coupled to periodic signal and produces circuit 113, and is arranged to comparison reference signal Ref and periodic signal Ramp, to produce comparison signal CMP.Control signal produces circuit 117 and is coupled to comparison circuit 115, and is arranged to produce control signal CTL according to comparison signal CMP, dynamically to adjust the deadline of upper bridge switch 131 and lower bridge switch 133.In implementation, control signal produces circuit 117 and can realize with circuit such as pwm signal generator, PFM signal generator or various flip-flops.
Signal adjustment circuit 119 is coupled to periodic signal and produces circuit 113 and comparison circuit 115.Be converted to by relative underloading in the load transient of heavy duty relatively in the load of power-switching circuit 100, signal adjustment circuit 119 can produce adjusts signal AS1, and utilizes and adjust the difference that signal AS1 control cycle signal generating circuit 113 reduces between the first filtering signal F1 and the second filtering signal F2.In addition,, in aforesaid load transient, when bridge switch 133 conducting instantly, signal adjustment circuit 119 also can downgrade the output current of periodic signal generation circuit 113, to accelerate the decrease speed of periodic signal Ramp.Thus, just can promote the reaction speed of control circuit 110 for the load variations of power-switching circuit 100, make control circuit 110 control drive circuit 120 and end in advance lower bridge switch 133, and bridge switch 131 on shorting advance.In other words, control circuit 110 can shorten the ON time (on time) of lower bridge switch 133 and shorten the deadline (off time) of upper bridge switch 131, make bridge switch 131 enter in advance next turn-on cycle, to accelerate the supplying with output of energy to power-switching circuit 100, avoid by this output voltage signal Vout to produce the problem of undershoot.
Below arrange in pairs or groups Fig. 2 and Fig. 3 are further illustrated to enforcement and the function mode of aforementioned periodic signal generation circuit 113.
Fig. 2 is the functional block diagram after an embodiment of the periodic signal generation circuit 113 in Fig. 1 simplifies.In the embodiment of Fig. 2, periodic signal produces circuit 113 and comprises the first filter 210, the second filter 220 and the first transduction circuit 230.The first filter 210 is arranged to produce the first filtering signal F1 according to the second feedback signal VL.The resistance-capacitance filter (RC-filter) that the first filter 210 in the present embodiment is made up of resistance 211 and electric capacity 213.In implementation, the first filter 210 also can be used the filter of other frameworks instead and realize.
The second filter 220 is coupled to the first filter 210, and is arranged to produce the second filtering signal F2 according to the first filtering signal F1.In the present embodiment, another resistance-capacitance filter that the second filter 220 is made up of variable resistor 221 and electric capacity 223.The first end of variable resistor 221 is coupled to the output of the first filter 210.The first end of electric capacity 223 is coupled to the second end of variable resistor 221, and so that the second filtering signal F2 to be provided, and the second end of electric capacity 223 is coupled to fixed potential end, for example, and earth terminal.In implementation, the second filter 210 also can be used the filter of other frameworks instead and realize.
The first transduction circuit 230 is coupled to the first filter 210 and the second filter 220, and is arranged to produce corresponding periodic signal Ramp according to the first filtering signal F1 with the difference between the second filtering signal F2.
Be converted to by relative underloading relatively in the load transient of heavy duty in the load of power-switching circuit 100, signal adjustment circuit 119 can utilize to be adjusted signal AS1 and controls the second filter 220 and reduce the difference between the second filtering signal F2 and the first filtering signal F1.For example, in the embodiment of Fig. 2, signal adjustment circuit 119 can utilize the resistance value of adjusting signal AS1 and downgrade the variable resistor 221 in the second filter 220, so that the waveform of the second filtering signal F2 comparatively approaches the waveform of the first filtering signal F1.Now, the difference between the first filtering signal F1 and the second filtering signal F2 can reduce, and the periodic signal Ramp that the first transduction circuit 230 produces also can reduce accordingly.The large I that reduces periodic signal Ramp promotes periodic signal and produces the reaction speed of circuit 113 for the load variations of power-switching circuit 100.
In addition,, in aforesaid load transient, when bridge switch 133 conducting instantly, signal adjustment circuit 119 also can draw the part output current of the first transduction circuit 230, to accelerate the decrease speed of periodic signal Ramp.Thus, control circuit 110 just can shorten the ON time of lower bridge switch 133 and the deadline of upper bridge switch 131, make bridge switch 131 enter in advance next turn-on cycle, to accelerate the supplying with output of energy to power-switching circuit 100, avoid by this output voltage signal Vout to produce the problem of undershoot.
Fig. 3 is the functional block diagram after another embodiment of the periodic signal generation circuit 113 in Fig. 1 simplifies.
The embodiment of the embodiment of Fig. 3 and earlier figures 2 is very similar, and main difference is that the periodic signal in Fig. 3 produces circuit 113 with the second filter 320, replaces the second filter 220 in Fig. 2.As shown in Figure 3, the second filter 320 is coupled to the first filter 210, and is arranged to produce the second filtering signal F2 according to the first filtering signal F1.In the present embodiment, another resistance-capacitance filter that the second filter 320 is made up of resistance 321, switch 323 and electric capacity 325.
The first end of resistance 321 is coupled to the output of the first filter 210.Switch 323 is coupled between the first end and the second end of resistance 321, and the control end of switch 323 is coupled to signal adjustment circuit 119.The first end of electric capacity 325 is coupled to the second end of resistance 321, and so that the second filtering signal F2 to be provided, and the second end of electric capacity 325 is coupled to fixed potential end, for example, and earth terminal.
Be converted to by relative underloading relatively in the load transient of heavy duty in the load of power-switching circuit 100, signal adjustment circuit 119 can utilize to be adjusted signal AS1 and controls the second filter 320 and reduce the difference between the second filtering signal F2 and the first filtering signal F1.For example, in the embodiments of figure 3, signal adjustment circuit 119 can utilize the switch 323 of adjusting in signal AS1 conducting the second filter 320, to reduce the equivalent resistance of the second filter 320, makes the waveform of the second filtering signal F2 comparatively approach the waveform of the first filtering signal F1.Now, difference between the first filtering signal F1 and the second filtering signal F2 can reduce, the periodic signal Ramp that the first transduction circuit 230 produces also can reduce accordingly, promotes by this periodic signal and produces the reaction speed of circuit 113 for the load variations of power-switching circuit 100.
In addition,, in aforesaid load transient, when bridge switch 133 conducting instantly, signal adjustment circuit 119 also can draw the part output current of the first transduction circuit 230, to accelerate the decrease speed of periodic signal Ramp.Thus, control circuit 110 just can shorten the ON time of lower bridge switch 133 and the deadline of upper bridge switch 131, make bridge switch 131 enter in advance next turn-on cycle, to accelerate the supplying with output of energy to power-switching circuit 100, avoid by this output voltage signal Vout to produce the problem of undershoot.
Below collocation Fig. 4 to Fig. 6 is further illustrated to enforcement and the function mode of aforementioned signal adjustment circuit 119.
Fig. 4 is the functional block diagram after an embodiment of the signal adjustment circuit 119 in Fig. 1 simplifies.In the embodiment of Fig. 4, signal adjustment circuit 119 comprises sampling and holding circuit 410, circuit for detecting 420 and matrix current adjustment circuit 430.Sampling is coupled to periodic signal with holding circuit 410 and produces circuit 113 and comparison circuit 115, and is arranged to produce sampling and inhibit signal Ramp-SH according to the first filtering signal F1 and comparison signal CMP.In the present embodiment, sampling samples the first filtering signal F1 can trigger with comparison signal CMP with holding circuit 410 time, to produce sampling and inhibit signal Ramp-SH.
Circuit for detecting 420 is coupled to sample with holding circuit 410 and periodic signal and produces circuit 113, and is arranged to foundation the second filtering signal F2 and sampling and inhibit signal Ramp-SH generation and adjusts signal AS1.In one embodiment, when sampling is with inhibit signal Ramp-SH while being greater than the second filtering signal F2, circuit for detecting 420 can judge that power-switching circuit 100 is now being converted in heavily loaded load transient by underloading.Therefore, circuit for detecting 420 can arrange adjustment signal AS1 to effective current potential, and utilizes the second filter 220 or 320 of adjusting in signal AS1 control cycle signal generating circuit 113, to reduce the difference between the second filtering signal F2 and the first filtering signal F1.From above stated specification, circuit for detecting 420 can produce the first filtering signal F1 and the second filtering signal F2 that circuit 113 produces by periodic signal, indirectly judges the load variations situation of power-switching circuit 100.
Matrix current adjustment circuit 430 is coupled to circuit for detecting 420 and produces circuit 113 with periodic signal.Instantly, when bridge switch 133 conducting, matrix current adjustment circuit 430 can downgrade according to adjustment signal AS1 the output current of periodic signal generation circuit 113, to accelerate the decrease speed of periodic signal Ramp.In implementation, matrix current adjustment circuit 430 can judge that lower bridge switch 133 is in conducting state or cut-off state according to lower bridge switch signal LG.
As shown in Figure 4, matrix current adjustment circuit 430 comprises switch 431, electric current groove 433, logical block 435 and flip-flop 437.The first end of switch 431 is coupled to the output of periodic signal generation circuit 113, for example, and the output of aforesaid the first transduction circuit 230.Electric current groove 433 is coupled to the second end of switch 431.Logical block 435 is coupled to the control end of switch 431, for the running of control switch 431.Flip-flop 437 is coupled between the output of circuit for detecting 420 and the input of logical block 435.In the present embodiment, logical block 435 can judge whether conducting of lower bridge switch 133 according to lower bridge switch signal LG, and only in the time of lower bridge switch 133 conducting, logical block 435 could actuating switchs 431.Therefore, lower bridge switch signal LG is the equal of the enable signal of logical block 435.
In matrix current adjustment circuit 430, flip-flop 437 can utilize upper bridge switch signal UG be used as reset signal, and in the time of upper bridge switch 131 conducting, the upper bridge switch signal UG flip-flop 437 of can resetting.
From above stated specification, be converted to by relative underloading in the load transient of heavy duty relatively in the load of power-switching circuit 100, only end and when lower bridge switch 133 conducting at upper bridge switch 131, flip-flop 437 just can be according to adjusting signal AS1 control logic unit 435 actuating switchs 431, make electric current groove 433 draw periodic signal produce circuit 113 output current (for example, draw the part output current of the first transduction circuit 230), to accelerate the decrease speed of periodic signal Ramp.Thus, can avoid matrix current adjustment circuit 430 that the situation of mistake start occurs in the process of upper bridge switch 131 conductings.
Fig. 5 is the functional block diagram after another embodiment of the signal adjustment circuit 119 in Fig. 1 simplifies.In the embodiment of Fig. 5, signal adjustment circuit 119 comprises sampling and holding circuit 410, circuit for detecting 420 and matrix current adjustment circuit 530.Sampling in Fig. 5 is identical with the embodiment in Fig. 4 with holding circuit 410 and circuit for detecting 420.Therefore,, about the sampling in Fig. 4 and holding circuit 410 and the running of circuit for detecting 420 and the explanation of execution mode, be also applicable to the embodiment of Fig. 5.
Matrix current adjustment circuit 530 in Fig. 5 is coupled to circuit for detecting 420 and produces circuit 113 with periodic signal.Instantly, when bridge switch 133 conducting, matrix current adjustment circuit 530 can downgrade according to adjustment signal AS1 the output current of periodic signal generation circuit 113, to accelerate the decrease speed of periodic signal Ramp.In implementation, matrix current adjustment circuit 530 can judge that lower bridge switch 133 is in conducting state or cut-off state according to lower bridge switch signal LG.
As shown in Figure 5, matrix current adjustment circuit 530 comprises switch 431, electric current groove 533, logical block 435, flip-flop 437 and the second transduction circuit 539.In matrix current adjustment circuit 530, switch 431, logical block 435 and flip-flop 437 are all identical with the embodiment in Fig. 4.Therefore,, about the switch 431 in Fig. 4, logical block 435 and the connection of flip-flop 437 and the explanation of function mode, be also applicable in the embodiment of Fig. 5.
In matrix current adjustment circuit 530, electric current groove 533 is coupled to the second end of switch 431.Control end and periodic signal that the second transduction circuit 539 is coupled to electric current groove 533 produce circuit 113, and are arranged to produce a difference signal according to the difference between the first filtering signal F1 and the second filtering signal F2.
Therefore, be converted to by relative underloading in the load transient of heavy duty relatively in the load of power-switching circuit 100, only end and when lower bridge switch 133 conducting at upper bridge switch 131, flip-flop 437 just can be according to adjusting signal AS1 control logic unit 435 actuating switchs 431, make electric current groove 533 according to this difference signal draw periodic signal produce circuit 113 output current (for example, draw the part output current of the first transduction circuit 230), to accelerate the decrease speed of periodic signal Ramp.Thus, can avoid matrix current adjustment circuit 530 that the situation of mistake start occurs in the process of upper bridge switch 131 conductings.
Fig. 6 is the functional block diagram after another embodiment of the signal adjustment circuit 119 in Fig. 1 simplifies.In the embodiment of Fig. 6, signal adjustment circuit 119 comprises sampling and holding circuit 410, circuit for detecting 420 and matrix current adjustment circuit 630.Sampling in Fig. 6 is identical with the embodiment in Fig. 4 with holding circuit 410 and circuit for detecting 420.Therefore,, about the sampling in Fig. 4 and holding circuit 410 and the running of circuit for detecting 420 and the explanation of execution mode, be also applicable to the embodiment of Fig. 6.
Matrix current adjustment circuit 630 in Fig. 6 is coupled to circuit for detecting 420 and produces circuit 113 with periodic signal.Instantly, when bridge switch 133 conducting, matrix current adjustment circuit 630 can downgrade according to adjustment signal AS1 the output current of periodic signal generation circuit 113, to accelerate the decrease speed of periodic signal Ramp.In implementation, matrix current adjustment circuit 630 can judge that lower bridge switch 133 is in conducting state or cut-off state according to lower bridge switch signal LG.
As shown in Figure 6, matrix current adjustment circuit 630 includes switch 631, the second transduction circuit 539, the 3rd transduction circuit 633, logical block 635 and flip-flop 437.The second transduction circuit 539 is coupled to periodic signal and produces circuit 113, and is arranged to produce a difference signal according to the difference between the first filtering signal F1 and the second filtering signal F2.The 3rd transduction circuit 633 is coupled to periodic signal and produces circuit 113 and the second transduction circuit 539.The first end of switch 631 is coupled to the input of the 3rd transduction circuit 633, and the second end of switch 631 is coupled to fixed potential end, for example, and earth terminal.Logical block 635 is coupled to the control end of switch 631.Flip-flop 437 is coupled between the output of circuit for detecting 420 and the input of logical block 635.In the present embodiment, logical block 635 can judge whether conducting of lower bridge switch 133 according to lower bridge switch signal LG, and only in the time of lower bridge switch 133 conducting, logical block 635 could cutoff switches 631.Therefore, lower bridge switch signal LG is the equal of the enable signal of logical block 635.
In matrix current adjustment circuit 630, flip-flop 437 can utilize upper bridge switch signal UG be used as reset signal, and in the time of upper bridge switch 131 conducting, the upper bridge switch signal UG flip-flop 437 of can resetting.
Therefore, be converted to by relative underloading in the load transient of heavy duty relatively in the load of power-switching circuit 100, only end and when lower bridge switch 133 conducting at upper bridge switch 131, flip-flop 437 just can be according to adjusting signal AS1 control logic unit 635 cutoff switches 631, make the 3rd transduction circuit 633 according to difference signal draw periodic signal produce circuit 113 output current (for example, draw the part output current of the first transduction circuit 230), to accelerate the decrease speed of periodic signal Ramp.Thus, can avoid matrix current adjustment circuit 630 that the situation of mistake start occurs in the process of upper bridge switch 131 conductings.
In aforementioned each embodiment, signal adjustment circuit 119 can produce the first filtering signal F1 and the second filtering signal F2 that circuit 113 produces by periodic signal, indirectly judges the load variations situation of power-switching circuit 100.Be converted to by relative underloading in the load transient of heavy duty relatively in the load of power-switching circuit 100, signal adjustment circuit 119 can utilize adjusts the difference that signal AS1 control cycle signal generating circuit 113 reduces between the first filtering signal F1 and the second filtering signal F2, to promote the reaction speed of control circuit 110 for the load variations of power-switching circuit 100.In addition, in aforesaid load transient, when upper bridge switch 131 ends and when lower bridge switch 133 conducting, signal adjustment circuit 119 also can draw the part output current of periodic signal generation circuit 113, produce the output current of circuit 113 to downgrade periodic signal, accelerate by this decrease speed of periodic signal Ramp.Thus, just loop response that can accelerating power source change-over circuit 100, make control circuit 110 shorten the lower ON time of bridge switch 133 and the deadline of upper bridge switch 131, cause bridge switch 131 to enter in advance next turn-on cycle, to accelerate the supplying with output of energy to power-switching circuit 100, avoid by this output voltage signal Vout to produce the problem of undershoot.
In the embodiment of earlier figures 4, also the flip-flop in matrix current adjustment circuit 430 437 can be omitted, and logical block 435 is directly coupled to the output of circuit for detecting 420, to simplify the framework of matrix current adjustment circuit 430.Therefore,, in aforesaid load transient, when bridge switch 133 conducting instantly, logical block 435 just can, according to adjusting signal AS1 actuating switch 431, make electric current groove 433 draw the output current of periodic signal generation circuit 113.
In the embodiment of earlier figures 5, also the flip-flop in matrix current adjustment circuit 530 437 can be omitted, and logical block 435 is directly coupled to the output of circuit for detecting 420, to simplify the framework of matrix current adjustment circuit 530.Therefore,, in aforesaid load transient, when bridge switch 133 conducting instantly, logical block 435 just can be according to adjusting signal AS1 actuating switch 431, makes electric current groove 533 draw the output current of periodic signal generation circuit 113 according to this difference signal.
In the embodiment of earlier figures 6, also the flip-flop in matrix current adjustment circuit 630 437 can be omitted, and logical block 635 is directly coupled to the output of circuit for detecting 420, to simplify the framework of matrix current adjustment circuit 630.Therefore,, in aforesaid load transient, when bridge switch 133 conducting instantly, logical block 635 just can be according to adjusting signal AS1 cutoff switch 431, makes the 3rd transduction circuit 633 draw the output current of periodic signal generation circuit 113 according to this difference signal.
From above stated specification, be converted to by relative underloading in the load transient of heavy duty relatively in the load of power-switching circuit 100, signal adjustment circuit 119 can downgrade the output current of periodic signal generation circuit 113, to accelerate the decrease speed of periodic signal Ramp.Thus, just loop response that can accelerating power source change-over circuit 100, make control circuit 110 shorten the lower ON time of bridge switch 133 and the deadline of upper bridge switch 131, cause bridge switch 131 to enter in advance next turn-on cycle, to accelerate the supplying with output of energy to power-switching circuit 100, avoid by this output voltage signal Vout to produce the problem of undershoot.
Therefore, produce the collocation running of circuit 113 and signal adjustment circuit 119 by aforesaid periodic signal, just can effectively promote the stability of the output voltage signal Vout of power-switching circuit 100, and control circuit 110 is for the reaction speed of the load variations of power-switching circuit 100, and without the size of output capacitance that increases power-switching circuit 100.Such framework neither can have influence on the loop response of power-switching circuit 100, can promote again the overall operation usefulness of power-switching circuit 100.
In specification and claim, use some vocabulary to censure specific element.But person of ordinary skill in the field should understand, same element may be called with different nouns.Specification and claim be not using the difference of title as the mode of distinguishing element, but the difference in function is used as the benchmark of distinguishing with element.Be open term at specification and claim mentioned " comprising ", therefore should be construed to " comprise but be not limited to ".In addition, " couple " at this and comprise directly any and indirectly connect means.Therefore, be coupled to the second element if describe the first element in literary composition, represent that the first element can directly be connected in the second element by the signal such as electric connection or wireless transmission, optical delivery connected mode, or by other elements or connection means indirectly electrically or signal be connected to this second element.
Used herein " and/or " describing mode, comprise cited one of them or the combination in any of multiple projects.In addition, unless in specification, specialize, the term of any odd number lattice all comprises the connotation of plural lattice simultaneously.
" voltage signal " word using in specification and claim on the implementation available current form is expressed, and " current signal " word using in specification and claim on the implementation also voltage available form express.
These are only preferred embodiment of the present invention, all equalizations of doing according to the claims in the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (24)
1. a control circuit for power-switching circuit, this power-switching circuit comprise bridge switch on, once bridge switch, with an inductance, it is characterized in that, this control circuit includes:
One periodic signal produces circuit, be arranged to according to one second feedback signal produce one first filtering signal, one second filtering signal, with a periodic signal, wherein, the voltage on one first end points of this second feedback signal and this inductance is corresponding;
One comparison circuit, is coupled to this periodic signal and produces circuit, and be arranged to comparison one reference signal and this periodic signal, to produce a comparison signal;
One control signal produces circuit, is coupled to this comparison circuit, and is arranged to produce a control signal according to this comparison signal, dynamically to adjust the deadline of bridge switch on this; And
One signal adjustment circuit, is coupled to this periodic signal and produces circuit and this comparison circuit;
Wherein, be converted to by relative underloading in a load transient of heavy duty relatively in the load of this power-switching circuit, in the time of this lower bridge switch conducting, this signal adjustment circuit can downgrade the output current of this periodic signal generation circuit, to accelerate the loop response of this power-switching circuit.
2. control circuit as claimed in claim 1, is characterized in that, this periodic signal produces circuit and includes:
One first filter, is arranged to produce this first filtering signal according to this second feedback signal;
One second filter, is coupled to this first filter, and is arranged to produce this second filtering signal according to this first filtering signal; And
One first transduction circuit, is coupled to this first filter and this second filter, and is arranged to produce this periodic signal according to the difference between this first filtering signal and this second filtering signal.
3. control circuit as claimed in claim 2, is characterized in that, this second filter includes:
One variable resistor, its first end is coupled to an output of this first filter; And
One first electric capacity, its first end is coupled to this variable-resistance the second end, and so that this second filtering signal to be provided, and the second end of this first electric capacity is coupled to a fixed potential end;
Wherein, in this load transient, this signal adjustment circuit can downgrade this variable-resistance resistance value, to reduce the difference between this second filtering signal and this first filtering signal.
4. control circuit as claimed in claim 2, is characterized in that, this second filter includes:
One first resistance, its first end is coupled to an output of this first filter;
One first switch, be coupled between the first end and the second end of this first resistance, and a control end of this first switch is coupled to this signal adjustment circuit; And
One first electric capacity, its first end is coupled to the second end of this first resistance, and so that this second filtering signal to be provided, and the second end of this first electric capacity is coupled to a fixed potential end;
Wherein, in this load transient, this this first switch of signal adjustment circuit meeting conducting, to reduce the difference between this second filtering signal and this first filtering signal.
5. as the control circuit of any one in claim 2～4, it is characterized in that, this signal adjustment circuit includes:
One sampling and holding circuit, is coupled to this periodic signal and produces circuit and this comparison circuit, and is arranged to produce sampling and an inhibit signal according to this first filtering signal and this comparison signal;
One circuit for detecting, be coupled to this sampling and holding circuit and this periodic signal and produce circuit, and be arranged to according to this second filtering signal and this sampling and inhibit signal generation one adjustment signal, and utilize this second filter of this adjustment signal controlling to reduce the difference between this second filtering signal and this first filtering signal; And
One matrix current adjustment circuit, is coupled to this circuit for detecting and this periodic signal and produces circuit;
Wherein, in the time of this lower bridge switch conducting, this matrix current adjustment circuit can downgrade according to this adjustment signal the output current of this periodic signal generation circuit, to accelerate the decrease speed of this periodic signal.
6. control circuit as claimed in claim 5, is characterized in that, this matrix current adjustment circuit includes:
One second switch, its first end is coupled to an output of this periodic signal generation circuit;
One electric current groove, is coupled to the second end of this second switch; And
One logical block, is coupled to an output of this circuit for detecting and a control end of this second switch;
Wherein, in the time of this lower bridge switch conducting, this logical block can be according to this this second switch of adjustment signal conduction, makes this electric current groove draw this periodic signal to produce the output current of circuit, to accelerate the decrease speed of this periodic signal.
7. control circuit as claimed in claim 5, is characterized in that, this matrix current adjustment circuit includes:
One second switch, its first end is coupled to an output of this periodic signal generation circuit;
One electric current groove, is coupled to the second end of this second switch;
One logical block, is coupled to an output of this circuit for detecting and a control end of this second switch; And
One second transduction circuit, the control end and this periodic signal that are coupled to this electric current groove produce circuit, and are arranged to produce a difference signal according to the difference between this first filtering signal and this second filtering signal;
Wherein, in the time of this lower bridge switch conducting, this logical block can be according to this this second switch of adjustment signal conduction, makes this electric current groove draw this periodic signal and produce the output current of circuit according to this difference signal, to accelerate the decrease speed of this periodic signal.
8. control circuit as claimed in claim 5, is characterized in that, this matrix current adjustment circuit includes:
One second transduction circuit, is coupled to this periodic signal and produces circuit, and be arranged to produce a difference signal according to the difference between this first filtering signal and this second filtering signal;
One the 3rd transduction circuit, is coupled to this periodic signal and produces circuit and this second transduction circuit;
One the 3rd switch, its first end is coupled to an input of the 3rd transduction circuit, and the second end of the 3rd switch is coupled to a fixed potential end; And
One logical block, is coupled to an output of this circuit for detecting and a control end of the 3rd switch;
Wherein, in the time of this lower bridge switch conducting, this logical block can be ended the 3rd switch according to this adjustment signal, makes the 3rd transduction circuit draw this periodic signal and produce the output current of circuit according to this difference signal, to accelerate the decrease speed of this periodic signal.
9. control circuit as claimed in claim 5, is characterized in that, this matrix current adjustment circuit, only in this lower bridge switch conducting and bridge switch when cut-off on this, just can downgrade according to this adjustment signal the output current of this periodic signal generation circuit.
10. control circuit as claimed in claim 9, is characterized in that, this matrix current adjustment circuit includes:
One second switch, its first end is coupled to an output of this periodic signal generation circuit;
One electric current groove, is coupled to the second end of this second switch;
One logical block, is coupled to a control end of this second switch; And
One flip-flop, is coupled between an output of this circuit for detecting and an input of this logical block;
Wherein, in the time of bridge switch cut-off on this and this lower bridge switch conducting, this flip-flop can be according to this this second switch of logical block conducting of this adjustment signal controlling, makes this electric current groove draw this periodic signal to produce the output current of circuit, to accelerate the decrease speed of this periodic signal.
11. control circuits as claimed in claim 9, is characterized in that, this matrix current adjustment circuit includes:
One second switch, its first end is coupled to an output of this periodic signal generation circuit;
One electric current groove, is coupled to the second end of this second switch;
One logical block, is coupled to a control end of this second switch;
One flip-flop, is coupled between an output of this circuit for detecting and an input of this logical block; And
One second transduction circuit, the control end and this periodic signal that are coupled to this electric current groove produce circuit, and are arranged to produce a difference signal according to the difference between this first filtering signal and this second filtering signal;
Wherein, in the time of bridge switch cut-off on this and this lower bridge switch conducting, this flip-flop can be according to this this second switch of logical block conducting of this adjustment signal controlling, make this electric current groove draw this periodic signal and produce the output current of circuit according to this difference signal, to accelerate the decrease speed of this periodic signal.
12. control circuits as claimed in claim 9, is characterized in that, this matrix current adjustment circuit includes:
One second transduction circuit, is coupled to this periodic signal and produces circuit, and be arranged to produce a difference signal according to the difference between this first filtering signal and this second filtering signal;
One the 3rd transduction circuit, is coupled to this periodic signal and produces circuit and this second transduction circuit;
One the 3rd switch, its first end is coupled to an input of the 3rd transduction circuit, and the second end of the 3rd switch is coupled to a fixed potential end;
One logical block, is coupled to a control end of the 3rd switch; And
One flip-flop, is coupled between an output of this circuit for detecting and an input of this logical block;
Wherein, in the time of bridge switch cut-off on this and this lower bridge switch conducting, this flip-flop can end the 3rd switch according to this this logical block of adjustment signal controlling, make the 3rd transduction circuit draw this periodic signal and produce the output current of circuit according to this difference signal, to accelerate the decrease speed of this periodic signal.
The control circuit of 13. 1 kinds of power-switching circuits, this power-switching circuit comprises an inductance, it is characterized in that, and this control circuit includes:
Bridge switch on one, its first end is for coupling an input voltage signal of this power-switching circuit, and on this second end of bridge switch for coupling one first end points of this inductance;
Bridge switch once, its first end is coupled to the second end of bridge switch on this, and the second end of this lower bridge switch is coupled to a fixed potential end;
One periodic signal produces circuit, be arranged to according to one second feedback signal produce one first filtering signal, one second filtering signal, with a periodic signal, wherein, the voltage on this first end points of this second feedback signal and this inductance is corresponding;
One comparison circuit, is coupled to this periodic signal and produces circuit, and be arranged to comparison one reference signal and this periodic signal, to produce a comparison signal;
One control signal produces circuit, is coupled to this comparison circuit, and is arranged to produce a control signal according to this comparison signal, dynamically to adjust the deadline of bridge switch on this; And
One signal adjustment circuit, is coupled to this periodic signal and produces circuit and this comparison circuit;
Wherein, be converted to by relative underloading in a load transient of heavy duty relatively in the load of this power-switching circuit, in the time of this lower bridge switch conducting, this signal adjustment circuit can be controlled this periodic signal and produce circuit and downgrade this periodic signal and produce the output current of circuit, to accelerate the loop response of this power-switching circuit.
14. as the control circuit of claim 13, it is characterized in that, this periodic signal produces circuit and includes:
One first filter, is arranged to produce this first filtering signal according to this second feedback signal;
One second filter, is coupled to this first filter, and is arranged to produce this second filtering signal according to this first filtering signal; And
One first transduction circuit, is coupled to this first filter and this second filter, and is arranged to produce this periodic signal according to the difference between this first filtering signal and this second filtering signal.
15. as the control circuit of claim 14, it is characterized in that, this second filter includes:
One variable resistor, its first end is coupled to an output of this first filter; And
One first electric capacity, its first end is coupled to this variable-resistance the second end, and so that this second filtering signal to be provided, and the second end of this first electric capacity is coupled to a fixed potential end;
Wherein, in this load transient, this signal adjustment circuit can downgrade this variable-resistance resistance value, to reduce the difference between this second filtering signal and this first filtering signal.
16. as the control circuit of claim 14, it is characterized in that, this second filter includes:
One first resistance, its first end is coupled to an output of this first filter;
One first switch, be coupled between the first end and the second end of this first resistance, and a control end of this first switch is coupled to this signal adjustment circuit; And
One first electric capacity, its first end is coupled to the second end of this first resistance, and so that this second filtering signal to be provided, and the second end of this first electric capacity is coupled to a fixed potential end;
Wherein, in this load transient, this this first switch of signal adjustment circuit meeting conducting, to reduce the difference between this second filtering signal and this first filtering signal.
17. as the control circuit of any one in claim 14～16, it is characterized in that, this signal adjustment circuit includes:
One sampling and holding circuit, is coupled to this periodic signal and produces circuit and this comparison circuit, and is arranged to produce sampling and an inhibit signal according to this first filtering signal and this comparison signal;
One circuit for detecting, be coupled to this sampling and holding circuit and this periodic signal and produce circuit, and be arranged to according to this second filtering signal and this sampling and inhibit signal generation one adjustment signal, and utilize this second filter of this adjustment signal controlling to reduce the difference between this second filtering signal and this first filtering signal; And
One matrix current adjustment circuit, is coupled to this circuit for detecting and this periodic signal and produces circuit;
Wherein, in the time of this lower bridge switch conducting, this matrix current adjustment circuit can downgrade according to this adjustment signal the output current of this periodic signal generation circuit, to accelerate the decrease speed of this periodic signal.
18. as the control circuit of claim 17, it is characterized in that, this matrix current adjustment circuit includes:
One second switch, its first end is coupled to an output of this periodic signal generation circuit;
One electric current groove, is coupled to the second end of this second switch; And
One logical block, is coupled to an output of this circuit for detecting and a control end of this second switch;
Wherein, in the time of this lower bridge switch conducting, this logical block can be according to this this second switch of adjustment signal conduction, makes this electric current groove draw this periodic signal to produce the output current of circuit, to accelerate the decrease speed of this periodic signal.
19. as the control circuit of claim 17, it is characterized in that, this matrix current adjustment circuit includes:
One second switch, its first end is coupled to an output of this periodic signal generation circuit;
One electric current groove, is coupled to the second end of this second switch;
One logical block, is coupled to an output of this circuit for detecting and a control end of this second switch; And
One second transduction circuit, the control end and this periodic signal that are coupled to this electric current groove produce circuit, and are arranged to produce a difference signal according to the difference between this first filtering signal and this second filtering signal;
Wherein, in the time of this lower bridge switch conducting, this logical block can be according to this this second switch of adjustment signal conduction, makes this electric current groove draw this periodic signal and produce the output current of circuit according to this difference signal, to accelerate the decrease speed of this periodic signal.
20. as the control circuit of claim 17, it is characterized in that, this matrix current adjustment circuit includes:
One second transduction circuit, is coupled to this periodic signal and produces circuit, and be arranged to produce a difference signal according to the difference between this first filtering signal and this second filtering signal;
One the 3rd transduction circuit, is coupled to this periodic signal and produces circuit and this second transduction circuit;
One the 3rd switch, its first end is coupled to an input of the 3rd transduction circuit, and the second end of the 3rd switch is coupled to a fixed potential end; And
One logical block, is coupled to an output of this circuit for detecting and a control end of the 3rd switch;
Wherein, in the time of this lower bridge switch conducting, this logical block can be ended the 3rd switch according to this adjustment signal, makes the 3rd transduction circuit draw this periodic signal and produce the output current of circuit according to this difference signal, to accelerate the decrease speed of this periodic signal.
21. as the control circuit of claim 17, it is characterized in that, this matrix current adjustment circuit, only in this lower bridge switch conducting and bridge switch when cut-off on this, just can downgrade according to this adjustment signal the output current of this periodic signal generation circuit.
22. as the control circuit of claim 21, it is characterized in that, this matrix current adjustment circuit includes:
One second switch, its first end is coupled to an output of this periodic signal generation circuit;
One electric current groove, is coupled to the second end of this second switch;
One logical block, is coupled to a control end of this second switch; And
One flip-flop, is coupled between an output of this circuit for detecting and an input of this logical block;
Wherein, in the time of bridge switch cut-off on this and this lower bridge switch conducting, this flip-flop can be according to this this second switch of logical block conducting of this adjustment signal controlling, makes this electric current groove draw this periodic signal to produce the output current of circuit, to accelerate the decrease speed of this periodic signal.
23. as the control circuit of claim 21, it is characterized in that, this matrix current adjustment circuit includes:
One second switch, its first end is coupled to an output of this periodic signal generation circuit;
One electric current groove, is coupled to the second end of this second switch;
One logical block, is coupled to a control end of this second switch;
One flip-flop, is coupled between an output of this circuit for detecting and an input of this logical block; And
One second transduction circuit, the control end and this periodic signal that are coupled to this electric current groove produce circuit, and are arranged to produce a difference signal according to the difference between this first filtering signal and this second filtering signal;
Wherein, in the time of bridge switch cut-off on this and this lower bridge switch conducting, this flip-flop can be according to this this second switch of logical block conducting of this adjustment signal controlling, make this electric current groove draw this periodic signal and produce the output current of circuit according to this difference signal, to accelerate the decrease speed of this periodic signal.
24. as the control circuit of claim 21, it is characterized in that, this matrix current adjustment circuit includes:
One second transduction circuit, is coupled to this periodic signal and produces circuit, and be arranged to produce a difference signal according to the difference between this first filtering signal and this second filtering signal;
One the 3rd transduction circuit, is coupled to this periodic signal and produces circuit and this second transduction circuit;
One the 3rd switch, its first end is coupled to an input of the 3rd transduction circuit, and the second end of the 3rd switch is coupled to a fixed potential end;
One logical block, is coupled to a control end of the 3rd switch; And
One flip-flop, is coupled between an output of this circuit for detecting and an input of this logical block;
Wherein, in the time of bridge switch cut-off on this and this lower bridge switch conducting, this flip-flop can end the 3rd switch according to this this logical block of adjustment signal controlling, make the 3rd transduction circuit draw this periodic signal and produce the output current of circuit according to this difference signal, to accelerate the decrease speed of this periodic signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310112502.9A CN104104230B (en) | 2013-04-02 | 2013-04-02 | The control circuit of power-switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310112502.9A CN104104230B (en) | 2013-04-02 | 2013-04-02 | The control circuit of power-switching circuit |
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| Publication Number | Publication Date |
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| CN104104230A true CN104104230A (en) | 2014-10-15 |
| CN104104230B CN104104230B (en) | 2017-03-15 |
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| CN201310112502.9A Expired - Fee Related CN104104230B (en) | 2013-04-02 | 2013-04-02 | The control circuit of power-switching circuit |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1592057A (en) * | 2003-08-29 | 2005-03-09 | 立锜科技股份有限公司 | DC-DC converter with load transient response fast reaction and method thereof |
| TW201225492A (en) * | 2010-12-08 | 2012-06-16 | Richtek Technology Corp | Voltage regulator and pulse width modulation signal generation method thereof |
| CN102810983A (en) * | 2011-06-02 | 2012-12-05 | 立锜科技股份有限公司 | Control circuit and method of PWM voltage regulator |
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2013
- 2013-04-02 CN CN201310112502.9A patent/CN104104230B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1592057A (en) * | 2003-08-29 | 2005-03-09 | 立锜科技股份有限公司 | DC-DC converter with load transient response fast reaction and method thereof |
| TW201225492A (en) * | 2010-12-08 | 2012-06-16 | Richtek Technology Corp | Voltage regulator and pulse width modulation signal generation method thereof |
| CN102810983A (en) * | 2011-06-02 | 2012-12-05 | 立锜科技股份有限公司 | Control circuit and method of PWM voltage regulator |
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| CN104104230B (en) | 2017-03-15 |
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