CN101030767A - Controlling circuit and loading system therewith - Google Patents
Controlling circuit and loading system therewith Download PDFInfo
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- CN101030767A CN101030767A CN 200610058364 CN200610058364A CN101030767A CN 101030767 A CN101030767 A CN 101030767A CN 200610058364 CN200610058364 CN 200610058364 CN 200610058364 A CN200610058364 A CN 200610058364A CN 101030767 A CN101030767 A CN 101030767A
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Abstract
The invention is concerned with the controlling circuit and loading system that uses the controlling circuit, the controlling circuit consists of the adjustable triangle wave generator, the error signal generator, and the pulse wave signal generator. The adjustable triangle wave generator uses the reference voltage and the feedback voltage to be the amplitude modulation and the frequency operation, outputs different amplitude and frequency triangle wave by the continuity or section mode, the error signal generator does the error operation for the reference voltage and the feedback voltage and outputs the error signal, the pulse signal generator outputs the pulse wave signal that the controlling voltage source supplies the loading system voltage according to the error signal and the adjustable triangle wave.
Description
Technical field
The invention relates to a kind of pulse wave width modulation control circuit, and particularly relevant for a kind of adjustable amplitude and frequency triangular wave generator, it is according to the operating state of present load system, output changes the triangular wave of amplitude and frequency with operating state, to control width and the frequency that pulse wave width modulation control circuit changes the pulse wave control signal of its output, to promote the transient response of load system.
Background technology
Pulse wave width modulation (Pulse Width Modulation, be called for short PWM) be a kind of tradition and practical control method, it is used in numerous control system with feedback circuit, as booster circuit, reduction voltage circuit, push-pull circuit, half-bridge circuit and full-bridge circuit widely.In these circuit, be after utilizing resulting feedback voltage to handle via error amplifier (Error Amplifier), with the triangular wave (Triangle Wave) of the fixed amplitude of triangular wave generator output via after the comparator computing, export one group of pulse wave that changes the modulation width along with error.
See also shown in Figure 5ly, it illustrates the pulse wave width modulation control circuit calcspar of known a kind of load system.Known load system 50 comprises the control of pulse wave modulation (PWM) circuit 500, diverter switch 550 and load circuit 560.The annexation of load system 50 is that diverter switch 550 is electrically connected to voltage source, pulse wave modulation control (PWM) circuit 500 and earthing potential end, the input 562 of load circuit 560 is electrically connected to diverter switch 550, the output 564 of load circuit 560 is electrically connected to the earthing potential end, and pulse wave modulation control (PWM) circuit 500 is electrically connected to the output 564 of load circuit 560.
In known pulse wave modulation control (PWM) circuit 500, it comprises triangular wave generator 510, error amplifier 520, comparator 530 and drive circuit 540.And the negative terminal of error amplifier 520 is electrically connected to the output 564 of load circuit 560, to receive the feedback voltage that load circuit 560 transmits, the anode of error amplifier 520 then receives a reference voltage, the anode of comparator 530 is electrically connected to error amplifier 520, the negative terminal of comparator 530 is electrically connected to triangular wave generator 510, and the output of comparator 530 then is connected to drive circuit 540.Please merge and consult Fig. 5 and shown in Figure 6, this Fig. 6 is the schematic diagram that illustrates triangular wave, error signal and the pulse wave control signal of known a kind of triangular wave generator output.The manner of execution of known pulse wave modulation control (PWM) circuit 500 is that error amplifier 520 is done the error computing according to received feedback voltage and reference voltage, exports an error signal (as the error signal waveform 604 that Fig. 6 illustrated) then to comparator 530.Triangular wave generator 510 is then promptly exported the triangular wave (as the triangular wave 602 that Fig. 6 illustrated) of fixed amplitude to comparator 530 after startup.At last, output drive signal after 530 triangular waves 602 with error signal 604 and fixed amplitude of comparator are made comparisons.At last, by drive circuit 540 output pulse wave control signals (as the waveform 606 of the pulse wave control signal that Fig. 6 illustrated).
In known load system 50, after diverter switch 550 receives the pulse wave control signal that comparator 530 transmits, promptly whether supply with operating voltage and give load circuit 560 according to this pulse wave control signal control voltage source.
Comprehensive the above, known pulse wave width modulation control circuit has following shortcoming:
(1) in the known pulse wave width modulation control circuit, because the width of pulse wave control signal is the error institute modulation that is produced by feedback voltage and reference voltage, so the noise of feedback voltage can exert an influence by direct width to the pulse wave control signal.
(2) load system that has a highly sensitive known pulse wave width modulation control circuit can have preferable transient response because of the setting of time constant, but can cause transient state too much and significantly reduce the stability of systematic steady state.
(3) load system that has a low known pulse wave width modulation control circuit of sensitivity can have relatively poor transient response because of the setting of time constant, but therefore lengthening of the time that system reaches stable state, and increases the stability of systematic steady state.
Summary of the invention
Therefore purpose of the present invention is exactly that a kind of control circuit and the load system of using it are being provided, after but it is to use modulation triangular wave generator in the control circuit to do computing according to feedback voltage and reference voltage, but output can change the modulation triangular wave of amplitude and frequency size with the change of feedback voltage.
Purpose of the present invention provides a kind of control circuit and the load system of using it again, but it is the modulation triangular wave that utilizes in the control circuit, makes load system having under the situation of preferable steady-state response, also can keep good transient response.
The present invention proposes a kind of control circuit, but comprises a modulation triangular wave generator, an error signal generator, a pulse wave signal generator and an one drive circuit.But but should modulation triangular wave generator adjust the amplitude and the frequency of modulation triangular wave signal, but to export a modulation triangular wave according to the indicating signal of indication one load circuit state.This error signal generator is to do the error computing with this indicating signal and a reference voltage, in order to export an error signal.But this pulse wave signal generator is electrically coupled to this modulation triangular wave generator and this error signal generator, but receive and to this error signal with should make comparisons by modulation triangular wave, in order to export a pulse wave control signal.And this drive circuit is electrically coupled to this pulse wave signal generator, receives and change this pulse wave control signal, in order to output drive signal.
Described according to preferred embodiment of the present invention, but but above-mentioned modulation triangular wave generator is the amplitude and the frequency size of the modulation triangular wave exported with the decision of the difference of feedback voltage and reference voltage.When the difference of feedback voltage and reference voltage surpasses transient state judgement voltage, but but the output of modulation triangular wave generator comprises the modulation triangular wave of first amplitude and first frequency.When the difference of feedback voltage and reference voltage is lower than transient state and judges voltage, but but the output of modulation triangular wave generator comprises the modulation triangular wave of the second frequency of second amplitude of gradual increase amplitude and gradual reduction frequency.When feedback voltage during more than or equal to reference voltage, but but the output of modulation triangular wave generator comprises the modulation triangular wave of the 3rd amplitude and the 3rd frequency.
Described according to preferred embodiment of the present invention, above-mentioned control circuit can be applicable to front-end circuit, in the multiple load systems such as road, booster circuit, reduction voltage circuit, push-pull circuit, half-bridge circuit and full-bridge circuit of speeding to wire back.
But the present invention is because of adopting modulation triangular wave generator, but therefore can be according to the modulation triangular wave of reference voltage and the suitable present operating state of feedback voltage output, so that load system can just reach stable state in the very fast time, and very high stability can also be arranged.
For above-mentioned and other purposes of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below:
Description of drawings
Fig. 1 is the circuit block diagram that illustrates according to a kind of pulse wave width modulation control circuit of a preferred embodiment of the present invention.
But but Fig. 2 A is the modulation triangular wave schematic diagram that illustrates the segmentation of exporting according to a kind of modulation triangular wave generator of a preferred embodiment of the present invention.
But but Fig. 2 B is the continuous modulation triangular wave schematic diagram that illustrates according to a kind of modulation triangular wave generator output of a preferred embodiment of the present invention.
But Fig. 3 is the circuit diagram that illustrates according to a kind of modulation triangular wave generator of a preferred embodiment of the present invention.
But Fig. 4 A is the circuit block diagram that illustrates according to the booster circuit of a kind of application modulation triangular wave generator of a preferred embodiment of the present invention.
But Fig. 4 B is the circuit block diagram that illustrates according to the reduction voltage circuit of a kind of application modulation triangular wave generator of a preferred embodiment of the present invention.
But Fig. 4 C is the circuit block diagram that illustrates according to the push-pull circuit of a kind of application modulation triangular wave generator of a preferred embodiment of the present invention.
But Fig. 4 D is the circuit block diagram that illustrates according to the full-bridge circuit of a kind of application modulation triangular wave generator of a preferred embodiment of the present invention.
But Fig. 4 E is the circuit block diagram that illustrates according to the half-bridge circuit of a kind of application modulation triangular wave generator of a preferred embodiment of the present invention.
Fig. 5 is the circuit block diagram of the pulse wave width modulation control circuit of known a kind of load system.
Fig. 6 is the schematic diagram of triangular wave, error signal and the pulse wave control signal of known a kind of triangular wave generator output.
40,50: load system 100,400: pulse wave width modulation control circuit
110,410: but modulation triangular wave generator 120,420: the error signal generator
130,430: pulse wave signal generator 140,440,540: drive circuit
202,204,206,208,210: but the modulation triangular wave
304: the second comparators of 302: the first comparators
306,308: 310: the three comparators of anti-lock
312,314: switch 316: charging current source
318: discharging current source 320: electric capacity
450,550: 452: the first ends of diverter switch
456: the three ends of 454: the second ends
460: booster circuit 462,562: input
464,564: output 466: controlled end
470: reduction voltage circuit 472: push-pull circuit
474: full-bridge circuit 476: half-bridge circuit
500: pulse wave produces circuit 510: the triangular wave generator
520: error amplifier 530: comparator
560: load circuit 602: triangular wave
604: error signal 606: the pulse wave control signal
Embodiment
See also shown in Figure 1ly, it illustrates the circuit block diagram according to a kind of pulse wave width modulation control circuit of a preferred embodiment of the present invention.In Fig. 1, but pulse wave width modulation control circuit 100 comprise modulation triangular wave generator 110, and drive signal generating circuit, this drivings signal generating circuit comprises error signal generator 120, pulse wave signal generator 130 and drive circuit 140.But modulation triangular wave generator 110 receives reference voltage 2 and makes triangle wave frequency and the amplitude of computing with decision output with the feedback voltage of indication load circuit state, and 120 pairs of reference voltages of error signal generator 1 are done computing and output error signal with feedback voltage.But pulse wave signal generator 130 then is coupled to modulation triangular wave generator 110 and error signal generator 120 respectively, but with output pulse wave control signal behind comparison error signal and the modulation triangular wave, last drive circuit 140 couples pulse wave signal generator 130, produce at least one driving signal according to the pulse wave control signal, with the conducting of the diverter switch of control load system with close.
Wherein reference voltage 1 can be identical or different reference voltage with reference voltage 2, but promptly should can receive identical reference voltage and feedback voltage with error signal generator 120 by modulation triangular wave generator 110.Adjust triangle wave amplitude and frequency according to reference voltage and feedback voltage, its amplitude and frequency are adjusted according to the state of actual output, and can effectively improve the transient response of load system, the response time that the minimizing load system reaches stable state.Moreover, can significantly prevent the response of load system to surpass desired value and increase the stability of load system in stable state.
Please merge and consult shown in Fig. 1, Fig. 2 A and Fig. 2 B, but but but Fig. 2 A and Fig. 2 B illustrate the modulation triangular wave schematic diagram of the segmentation of exporting according to a kind of modulation triangular wave generator of a preferred embodiment of the present invention and continuous modulation triangular wave schematic diagram respectively.
But the implementation method of the modulation triangular wave of the segmentation of the explanation Fig. 2 A of elder generation.In the present embodiment, when but pulse wave width modulation control circuit 100 judges that when modulation triangular wave generator 110 difference of learning feedback voltage and reference voltage surpasses default transient state judgement voltage (for example :) in starting or trigger process, the triangular wave that but modulation triangular wave generator 110 output amplitudes are less, frequency is higher (triangular wave of being painted as Fig. 2 A 202 or 204), make system can apace output be adjusted to a predetermined value, or make load reach critical startup value fast.Therefore, the present invention can reach good transient response, and reduces the response time that load system reaches stable state.
When but modulation triangular wave generator 110 judges that the difference of learning feedback voltage and reference voltage is lower than default transient state judgement voltage and (also can be difference when diminishing greatly gradually, be that load has reached critical startup value and enters starting state) time, but 110 output amplitudes of modulation triangular wave generator are than opening the triangular wave that the beginning state is big, frequency is lower (triangular wave of being painted as Fig. 2 A 204 or 206).But and judge when learning feedback voltage when modulation triangular wave generator 110, but 110 output amplitude maximums of modulation triangular wave generator, triangular wave that frequency is minimum (triangular wave of being painted as Fig. 2 A 206 or 208) more than or equal to reference voltage.Therefore, the present invention's output that can suppress load system surpasses the amplitude of predetermined value and increases the stability of load system in stable state.
But and the implementation method of the continuous modulation triangular wave of Fig. 2 B, it is to adjust triangle wave amplitude and frequency continuously according to the difference of feedback voltage and reference voltage, when difference was big, its amplitude was less, frequency is higher; And difference hour, and its amplitude is big, frequency is lower.
Certainly, triangle wave amplitude of the present invention, frequency is adjusted in fact from not exceeding with the foregoing description.The amplitude or the frequency that for example need lower (or particular range) in trigger process for load circuit, when judging that according to the difference of feedback voltage and reference voltage it is in trigger process, the amplitude and the frequency that provide this to be fit to, and when transient state, just transient state time is effectively shortened with lower amplitude and higher frequency.Therefore, the present invention can set different Rule of judgment, so that the triangular wave of optimum frequency, amplitude to be provided according to this Rule of judgment.
Then see also Fig. 3, but it illustrates the circuit diagram according to a kind of modulation triangular wave generator of a preferred embodiment of the present invention.In the present embodiment, but only explain orally a kind of circuit of modulation triangular wave generator 110, but and when designer's design modulation triangular wave generator 110 from ought be not as limit.But this modulation triangular wave generator 110 comprises first comparator 302, second comparator 304, and not b gate (NAND) 306 and the 308, the 3rd comparator 310, switch 312 and 314, charging current source 316, discharging current source 318 and electric capacity 320.
In the present embodiment, first comparative voltage and second comparative voltage are to produce according to feedback voltage and reference voltage, in order to decision triangle wave amplitude.When but the electric capacity 320 of modulation triangular wave generator 110 is in the state of charging, switch 312 will cut out by the 3rd comparator 310, make charging current source 316 electric current can be charged to electric capacity 320.At this moment, but the triangular wave wave number (voltage of electric capacity 320) that modulation triangular wave generator 110 is exported will rise gradually.When the rising of triangular wave wave number was higher than first comparative voltage (VH), the voltage of first comparator, 302 outputs can drop to the current potential of logical zero representative.At this moment, the output voltage of and not b gate 306 can change and rises to the current potential of logical one representative.And because the current potential of the process intermediate cam ripple of charging representative can be higher than second comparative voltage (VL), so the voltage of second comparator, 304 outputs can continue to maintain the current potential of logical one representative.At this moment, the output of two ends of and not b gate 308 inputs, and not b gate 306 and the output of second comparator 304 are under the situation of current potential of logical one representative, and the voltage of and not b gate 308 outputs can drop to the current potential of logical zero representative.Therefore, the current potential of the logical one of the anode of the 3rd comparator 310 input representative will be accurate higher than the position of the current potential of the logical zero representative of negative terminal input.The voltage of the 3rd comparator 310 outputs then can rise to the current potential of logical one representative, and again switch 312 is opened (turn off), and interrupts the charging of 316 pairs of electric capacity 320 of charging current source, and finishes the process of charging.
When the voltage of the 3rd comparator 310 outputs was the current potential of logical one representative, switch 314 was understood conductings (turn on) and is made electric capacity 320 be in the state of discharge, and discharging current source 318 is disengaged electric current by electric capacity 320.Therefore, the current potential of triangular wave representative (wave number) will descend gradually.When being reduced to second comparative voltage (VL) under the current potential of triangular wave representative, the voltage of second comparator, 304 outputs can drop to the current potential of logical zero representative.At this moment, the output voltage of and not b gate 308 can change and rises to the current potential of logical one representative.Because in the process of discharge, the current potential of triangular wave representative will be lower than first comparative voltage (VH), the output voltage of first comparator 302 can continue to maintain the current potential of logical one representative.At this moment, the output of two ends of and not b gate 306 inputs, and not b gate 308 and the output of first comparator 302 are under the situation of current potential of logical one representative, and the output voltage of and not b gate 306 can drop to the current potential of logical zero representative.Therefore, the current potential of the logical zero representative of the anode of the 3rd comparator 310 input can be accurate lower than the position of the current potential of the logical one representative of negative terminal input, the output of the 3rd comparator 310 can drop to the current potential of logical zero representative, and again switch 314 is opened (turn off), and interrupt the discharge of the 318 pairs of electric capacity 320 in discharging current source, to finish the process of discharge.
In the present embodiment, when the gap of feedback voltage and reference voltage is still big, the first comparative voltage VH of first comparator 302 can be one group of lower voltage, make the first comparative voltage VH and the voltage difference between the second comparative voltage VL can be relative less, and charging current source 316 and discharging current source 318 be constant current source.At this moment, but modulation triangular wave generator 110 can produce one group of triangular wave that amplitude is less and frequency is high.
In the present embodiment, when the gap of feedback voltage and reference voltage moves closer to, the first comparative voltage VH of first comparator 302 can rise gradually, but therefore modulation triangular wave generator 110 can produce the triangular wave that one group of amplitude increases gradually and frequency reduces gradually.
In the present embodiment, when the gap of feedback voltage and reference voltage very near the time, the first comparative voltage VH of first comparator 302 can rise and approach to a maximum.At this moment, but therefore modulation triangular wave generator 110 can produce one group of peak swing and the minimum triangular wave of frequency.
Please then consult shown in Fig. 4 A, but it illustrates the circuit block diagram according to the booster circuit of a kind of application modulation triangular wave generator of a preferred embodiment of the present invention.In the present embodiment, load system 40 is to be electrically coupled to voltage source, and comprises pulse wave width modulation control circuit 400, diverter switch 450 and booster circuit 460.
In the present embodiment, booster circuit 460 has input 462, output 464 and a controlled end 466.The input 462 of this booster circuit 460 is to be electrically coupled to voltage source, and controlled end 466 also optionally receives the operating voltage that voltage source is supplied with according to the control of this diverter switch 450.Secondly, pulse wave width modulation control circuit 400 is the outputs 464 that are electrically coupled to booster circuit 460, but and pulse wave width modulation control circuit 400 comprises modulation triangular wave generator 410, error signal generator 420, pulse wave signal generator 430 and drive circuit 440.Diverter switch 450 then has first end 452, second end 454 and the 3rd end 456, first end 452 of this diverter switch 450 is electrically coupled to drive circuit 440, second end 454 is electrically coupled to controlled end 466, the 3rd end 456 is electrically coupled to earth terminal, and diverter switch 450 is the operating voltages that make booster circuit 460 these voltage sources of conversion according to the drive signal of drive circuit 440.
In the present embodiment, but modulation triangular wave generator 410 is feedback voltages that the output 464 of reception booster circuit 460 transmits, and make amplitude modulation and frequency calculation, but to export the modulation triangular wave that changes amplitude, frequency size with the change of feedback voltage with default reference voltage and feedback voltage.Secondly, error signal generator 420 is to do the error computing according to feedback voltage and reference voltage, with output error signal.Then, but pulse wave signal generator 430 is electrically coupled to modulation triangular wave generator 410 and error signal generator 420, but receives and error signal and modulation triangular wave are made comparisons, with output pulse wave control signal.At last, drive circuit 440 is electrically coupled to pulse wave signal generator 430, receives also conversion pulse wave control signal, with output drive signal to diverter switch 450.
In the present embodiment, when the running of load system 40 was closed when diverter switch 450, voltage source was supplied with the required operating voltage of booster circuit 460 actions, otherwise when diverter switch 450 was switched on, voltage source stopped to supply with operating voltage and gives booster circuit 460.But modulation triangular wave generator 410 is then done the amplitude modulation computing with output 464 feedback voltage that transmits and the reference voltage of presetting of booster circuit 460.
When the difference of feedback voltage and reference voltage surpasses default transient state judgement voltage, can judge and learn that booster circuit 460 is operated in the beginning state that opens.At this moment, but but modulation triangular wave generator 410 is output comprises the modulation triangular wave of first amplitude and first frequency.
When the difference of feedback voltage and reference voltage is lower than transient state judgement voltage, can judges and learn that booster circuit 460 is operated in the transient state state.At this moment, but but modulation triangular wave generator 410 is modulation triangular waves that output comprises the second frequency of second amplitude of gradual increase amplitude and gradual reduction frequency.
When feedback voltage during (or the difference of feedback voltage and reference voltage be lower than stable state judge voltage), can judge and learn that booster circuit 460 is operated in stable state (or entering stable state) more than or equal to reference voltage.At this moment, but but modulation triangular wave generator 410 is output comprises the modulation triangular wave of the 3rd amplitude and the 3rd frequency.
As described above, but the frequency and the amplitude of 410 outputs of modulation triangular wave generator can be according to the required adjustment of the practical operation of load circuit, its charging current source 316 and discharging current source 318 are not limited to constant current source, and be not limited to as the above-mentioned beginning state that opens is highest frequency, minimum amplitude, the transient state state is time high-frequency, inferior little amplitude, and stable state is low-limit frequency, peak swing.Therefore, first comparative voltage and second comparative voltage, charging current source and discharging current source can provide predetermined comparative voltage and electric current according to preset judgment condition, and reach the triangular wave that best amplitude, frequency are provided.
Please then consult shown in Fig. 4 B, but it illustrates the circuit block diagram according to the reduction voltage circuit of a kind of application modulation triangular wave generator of a preferred embodiment of the present invention.Itself and 4A figure difference change to reduction voltage circuit 470 with the booster circuit among the 4A figure 460 and this diverter switch 450 are electrically coupled to this voltage source and the reduction voltage circuit 470 except that being, its function mode then is close with 4A figure.
Please then consult shown in Fig. 4 C, but it illustrates the circuit block diagram according to the push-pull circuit of a kind of application modulation triangular wave generator of a preferred embodiment of the present invention.Itself and 4A figure difference are that push-pull circuit 472 is not coupled to voltage source, and this push-pull circuit 472 is to produce induced current when diverter switch 450 is switched on.Function mode in pulse wave width modulation control circuit 400 is identical with 4A figure then.
Please then consult shown in Fig. 4 D and Fig. 4 E, but but it illustrates the circuit block diagram according to the half-bridge circuit of the circuit block diagram of the full-bridge circuit of a kind of application modulation triangular wave generator of a preferred embodiment of the present invention and a kind of application modulation triangular wave generator respectively.
In Fig. 4 D, itself and Fig. 4 C difference only are the push-pull circuit 472 of Fig. 4 C is replaced by full-bridge circuit 474, and its manner of execution is then all identical with Fig. 4 C.
In Fig. 4 E, itself and Fig. 4 C difference only are the push-pull circuit 472 of Fig. 4 C is replaced by half-bridge circuit 476, and its manner of execution is then all identical with Fig. 4 C.
In preferred embodiment of the present invention, the state of the work after various load circuits are activated not is after certain needs experience opens beginning state, transient state state, just can reach stable state, the present invention just state that load circuit is possible enumerates, but certainly not as limit.
In preferred embodiment of the present invention, error signal generator 120,420 can be an error integrator, but not as limit.
In preferred embodiment of the present invention, pulse wave signal generator 130,430 can be a comparator, but not as limit.
In preferred embodiment of the present invention, transient state is judged the difference of the visual load circuit of voltage, is preset by designer's demand of looking.
In preferred embodiment of the present invention, reference voltage is provided by reference voltage generator (not illustrating), but and provides to the value of the reference voltage of error signal generator and modulation triangular wave generator and can be set according to actual needs by circuit designer.
In preferred embodiment of the present invention, but load system 40 can be the front-end circuit or (flyback) circuit of speeding back of using modulation triangular wave generator, but all not as limit.
Comprehensive the above, pulse wave width modulation control circuit of the present invention has following advantage with the load system of using it:
(1) pulse wave width modulation control circuit of the present invention and the load system of using it, it can utilize error integrator to replace error amplifier, to obtain better interference resistant ability.
(2) but the modulation triangular wave generator of pulse wave width modulation control circuit of the present invention and the load system of using it can effectively improve the transient response of load system.
(3) pulse wave width modulation control circuit of the present invention and the load system of using it can make load system improve in the stability of stable state according to the time constant of the condition enactment system of preferable transient response.
(4) pulse wave width modulation control circuit of the present invention and the load system of using it can significantly prevent the response of load system to surpass desired value.
(5) pulse wave width modulation control circuit of the present invention and the load system of using it can reduce the response time that load system reaches stable state.
(6) pulse wave width modulation control circuit of the present invention and the load system of using it can be made on the integrated circuit (Integrated Circuit drills title IC).
Though the present invention discloses as above with a preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking aforesaid the claim person of defining.
Claims (24)
1, a kind of control circuit is characterized in that it comprises:
But a modulation triangular wave generator, but in order to exporting a modulation triangular wave, but but the amplitude and the frequency of modulation triangular wave signal should modulation triangular wave generator be adjusted according to the indicating signal of indication one load circuit state;
One error signal generator is done the error computing with this indicating signal and a reference voltage, in order to export an error signal;
One pulse wave signal generator, but be electrically coupled to this modulation triangular wave generator and this error signal generator, but receive and to this error signal with should make comparisons by modulation triangular wave, in order to export a pulse wave control signal; And
One drive circuit is electrically coupled to this pulse wave signal generator, receives and change this pulse wave control signal, in order to output drive signal.
2, control circuit according to claim 1, but it is characterized in that wherein said modulation triangular wave generator more produces two amplitude comparative voltages according to this reference voltage, but crest, trough value to determine this modulation triangular wave.
3, control circuit according to claim 2, when it is characterized in that wherein difference when the voltage of described indicating signal and this reference voltage surpasses a default transient state and judges voltage, but but should the output of modulation triangular wave generator comprise one first amplitude and a first frequency should the modulation triangular wave.
4, control circuit according to claim 2, when it is characterized in that wherein difference when the voltage of described indicating signal and this reference voltage is lower than this transient state and judges voltage, but but should the output of modulation triangular wave generator comprise one second amplitude of gradual increase amplitude and gradual reduction a second frequency should modulation triangular wave.
5, according to claim 1 or 2 or 3 described control circuits, when it is characterized in that wherein difference when described feedback voltage and this reference voltage is lower than this transient state and judges voltage, but but should the output of modulation triangular wave generator comprise one second amplitude and a second frequency should modulation triangular wave.
6, control circuit according to claim 5, when it is characterized in that wherein difference when described feedback voltage and this reference voltage is lower than a stable state and judges voltage, but but should modulation triangular wave generator be output comprise one the 3rd amplitude and one the 3rd frequency should modulation triangular wave.
7, a kind of load system is electrically coupled to a power supply, it is characterized in that described load system comprises:
One control circuit, this control circuit comprises:
But a modulation triangular wave generator, an indicating signal of the state of a load is indicated in reception, and does amplitude modulation computing frequently with a reference voltage and this indicating signal, but changes a modulation triangular wave of amplitude and frequency size with the change of this indicating signal in order to output; And
One drives signal generating circuit, but is electrically coupled to this modulation triangular wave generator, but reaches this modulation triangular wave and output drive signal according to this indicating signal;
One switches switch, is electrically coupled to this control circuit to carry out switch motion according to this drive signal; And
One change-over circuit, this load is changed and exported to this diverter switch of electric property coupling with this switch motion according to this diverter switch with the electric power of this power supply.
8, load system according to claim 7, but it is characterized in that wherein said modulation triangular wave generator more produces two amplitude comparative voltages according to this reference voltage, but crest, trough value to determine this modulation triangular wave.
9, load system according to claim 7, when it is characterized in that wherein difference when described feedback voltage and this reference voltage surpasses a default transient state and judges voltage, but but should the output of modulation triangular wave generator comprise one first amplitude and a first frequency should the modulation triangular wave.
10, according to claim 7 or 9 described load systems, when it is characterized in that wherein difference when described feedback voltage and this reference voltage is lower than this transient state and judges voltage, but but should the output of modulation triangular wave generator comprise one second amplitude of gradual increase amplitude and gradual reduction a second frequency should modulation triangular wave.
11, according to claim 7 or 9 described load systems, when it is characterized in that wherein difference when described feedback voltage and this reference voltage is lower than this transient state and judges voltage, but but should the output of modulation triangular wave generator comprise one second amplitude and a second frequency should modulation triangular wave.
12, load system according to claim 10, when it is characterized in that wherein difference when described feedback voltage and this reference voltage is lower than a stable state and judges voltage, but but should the output of modulation triangular wave generator comprise one the 3rd amplitude and one the 3rd frequency should modulation triangular wave.
13, a kind of load system is electrically coupled to a power supply, it is characterized in that this load system comprises:
One control circuit, this control circuit comprises:
But a modulation triangular wave generator, an indicating signal of the state of a load is indicated in reception, and does amplitude modulation computing frequently with a reference voltage and this indicating signal, but changes a modulation triangular wave of amplitude and frequency size with the change of this indicating signal in order to output; And
One drives signal generating circuit, but is electrically coupled to this modulation triangular wave generator, but reaches this modulation triangular wave and output drive signal according to this indicating signal;
One switches switch, have one first end, one second end and one the 3rd end, this of this diverter switch first end is electrically coupled to this control circuit to control the electric power output of this power supply according to this drive signal, this of this diverter switch second this power supply of end electric property coupling, the 3rd end of this diverter switch is electrically coupled to earth terminal; And
One change-over circuit has an input and an output, and this input of this change-over circuit is to be electrically coupled to this diverter switch with this electric power output of receiving this power supply and change this this load of output electric property coupling.
14, load system according to claim 13, but it is characterized in that wherein said modulation triangular wave generator more produces two amplitude comparative voltages according to this reference voltage, but crest, trough value to determine this modulation triangular wave.
15, load system according to claim 13, when it is characterized in that wherein difference when described feedback voltage and this reference voltage surpasses a default transient state and judges voltage, but but should the output of modulation triangular wave generator comprise one first amplitude and a first frequency should the modulation triangular wave.
16, according to claim 13 or 15 described load systems, when it is characterized in that wherein difference when described feedback voltage and this reference voltage is lower than this transient state and judges voltage, but but should modulation triangular wave generator be the output second frequency that comprises one second amplitude of gradual increase amplitude and gradual reduction should modulation triangular wave.
17, according to claim 13 or 15 described load systems, when it is characterized in that wherein difference when described feedback voltage and this reference voltage is lower than this transient state and judges voltage, but but should the output of modulation triangular wave generator comprise one second amplitude and a second frequency should modulation triangular wave.
18, load system according to claim 16, when it is characterized in that wherein difference when described feedback voltage and this reference voltage is lower than a stable state and judges voltage, but but should the output of modulation triangular wave generator comprise one the 3rd amplitude and one the 3rd frequency should modulation triangular wave.
But 19, a kind of modulation triangular wave generator is characterized in that it comprises:
One electric capacity is in order to produce a triangular wave signal;
One current source circuit is in order to discharge and recharge this electric capacity;
One reference voltage generator produces two comparative voltages according to a state signal; And
One control circuit decides the amplitude of this triangular wave signal according to this two comparative voltage;
Wherein the frequency of this triangular wave signal is by the common decision of charge-discharge velocity institute of this two comparative voltage and this current source circuit.
But 20, modulation triangular wave generator according to claim 19 is characterized in that wherein said state signal is in order to indicate the state of a load system.
But 21, modulation triangular wave generator according to claim 20 is characterized in that charging, discharging current that wherein said current source circuit provides are to decide electric current.
But 22, modulation triangular wave generator according to claim 20 is characterized in that wherein said current source circuit adjusts charge-discharge velocity to this electric capacity according to this state signal.
But 23, modulation triangular wave generator according to claim 20 is characterized in that wherein said reference voltage generator more produces at least one judgement voltage, and this control circuit more produces this two comparative voltage according to this at least one judgement voltage.
But 24, modulation triangular wave generator according to claim 23 is characterized in that wherein said current source circuit more determines charge-discharge velocity to this electric capacity according to this at least one judgement voltage.
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