CN101599692B - Quick response device and method of switching power converter - Google Patents
Quick response device and method of switching power converter Download PDFInfo
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- CN101599692B CN101599692B CN 200810125924 CN200810125924A CN101599692B CN 101599692 B CN101599692 B CN 101599692B CN 200810125924 CN200810125924 CN 200810125924 CN 200810125924 A CN200810125924 A CN 200810125924A CN 101599692 B CN101599692 B CN 101599692B
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Abstract
A quick response device of a switching power converter comprises a detection circuit and a regulating circuit; wherein, the detection circuit is used for detecting the output voltage of the power converter so as to trigger quick response during instantaneous load; the regulating circuit is used for regulating the quick response time. The quick response device of the invention has the advantages that quick response is accurately triggered, the quick response time is controlled by the regulating circuit and the undershoot or ringback situation is avoided.
Description
Technical field
The present invention relates to a kind of switch type power converter, specifically, is a kind of quick response device and method of switch type power converter.
Background technology
Fig. 1 shows traditional heterogeneous switch type power converter 10.The oscillogram of signal in Fig. 2 displayed map 1.Wherein power supply changeover device 10 can provide stable output voltage V core the electronic installation to other, CPU for example, in power supply changeover device 10, the difference that error amplifier 14 reaches according to output voltage V core between the reference voltage Vref that is provided by reference voltage generator 12 produces error signal Vcomp, shown in waveform 32, sawtooth generator 16 provides sawtooth waveforms Vramp1 and Vramp2, shown in waveform 28 and 30, and pulse-width modulation (Pulse Width Modulation; PWM) comparator 18 produces signal Vpwm1 according to error signal Vcomp and sawtooth waveforms Vramp1, shown in waveform 34, as sawtooth waveforms Vramp1 during less than error signal Vcomp, signal Vpwm1 is a high levle, at this moment, passage 22 be opened (tum on) so that electric charge to capacitor C 1 to be provided output voltage V core is risen, shown in ripple 26, PWM comparator 20 produces signal Vpwm2 according to error signal Vcomp and sawtooth waveforms Vramp2, shown in waveform 36, as sawtooth waveforms Vramp2 during less than error signal Vcomp, signal Vpwm2 is a high levle, at this moment, passage 24 is opened to provide electric charge to capacitor C 2 that output voltage V core is risen.
Yet, no matter the load current of CPU is to be uprised or by high step-down by low now, its variation is quite quick, the time that changes is within 1us, it is quite short that this switching cycle with power supply changeover device 10 is compared, when if load instantaneous appears at the pulse of signal Vpwm1 or Vpwm2, as interval t2, because passage 22 or 24 is opened, therefore can relax the speed that output voltage V core descends, but when load instantaneous appears between the pulse of signal Vpwm1 and Vpwm2, as interval t1, because signal Vpwm1 and Vpwm2 are low level, so output voltage V core will break away from control, in addition, even if load instantaneous is the impulse duration that appears at signal Vpwm1 or Vpwm2, if load variations is too big, output voltage V core still falls sharply, so need to respond (quick response) loop fast can open passage 22 and 24 simultaneously when load instantaneous occurs.
Good output voltage V core is arranged, good quick response will be arranged, and will reach good quick response two keys are arranged, one is to trigger the opportunity of response fast, and another is the time length that responds fast.If trigger response fast too slowly, may make output voltage V core be lower than the requirement of specification, i.e. the situation of super (undershoot) is hanged down in appearance; On the contrary, if too fast the triggering fast responds, may cause output voltage V core sharp wave (spike) to occur.If the quick time that responds is too short, low super situation still can appear in output voltage V core, if the still quick time that responds is oversize, output voltage V core will rise excessive and resilience (ringback) situation occur.
Fig. 3 shows a kind of known to realize adaptation phase alignment (the Adaptive PhaseAlignment of response fast; APA) circuit 40, it comprises that error amplifier 42 produces error signal Vcomp according to the output voltage V core and the difference between the reference voltage Vref of power supply changeover device, low pass filter 44 filtering error signal Vcomp produce signal V2, current source 48 provides electric current I apa to produce voltage Vapa offset error signal Vcomp through resistance R apa and produces signal V1, and comparator 46 produces quick response signal QR according to signal V1 and V2.When load instantaneous, error signal Vcomp will descend, signal V2 also will descend thereupon, because the relation of capacitor C apa, signal V1 can not descend immediately, and when signal V2 was lower than signal V1, response signal QR transferred high levle to trigger quick response fast, at quick response duration, all passages of heterogeneous switch type power converter all will be opened.Because the triggering of response is by signal V1 decision fast, and signal
V1=Vcomp-Iapa * Rapa formula 1
Therefore, can trigger the time point of response fast by changing by the resistance R apa that is adjusted at chip exterior, for example, use bigger resistance R apa to postpone the triggered time of response fast, yet in APA circuit 40, the duration of response is by low pass filter 44 decisions fast, and low pass filter 44 is built in the chip in being, therefore can't adjust the time of quick response.
In addition, the purpose of response is in order to obtain good output voltage V core fast, the APA technology is utilized the information of error signal Vcomp to replace output voltage V core and is triggered quick response, yet, those skilled in the art is clear, error amplifier 42 needs compensator to come error signal Vcomp is compensated, that is to say, when beginning to drop to error signal Vcomp, output voltage V core begins to have a compensating delay between the rising, when if load instantaneous changes very soon, this compensating delay will cause output voltage V core being lower than setting before the response triggering fast.
Therefore known quick response device exists above-mentioned all inconvenience and problem.
Summary of the invention
Purpose of the present invention is to propose a kind of quick response device and method that can accurately trigger quick response and can regulate the switch type power converter of the time that responds fast.
For achieving the above object, technical solution of the present invention is:
A kind of quick response device of switch type power converter comprises a testing circuit and a regulating circuit, wherein:
The output voltage that described testing circuit detects described power supply changeover device is to trigger response fast when the load instantaneous;
Described regulating circuit is regulated the time of described quick response.
The quick response device of switch type power converter of the present invention can also be further achieved by the following technical measures.
The quick response device of aforesaid switch type power converter, wherein said testing circuit comprises:
One off-centre circuit is offset described output voltage and produces an offset voltage;
One comparator, a more described offset voltage and a reference voltage trigger described quick response when described offset voltage is lower than described reference voltage.
The quick response device of aforesaid switch type power converter, wherein said reference voltage equal the described output voltage of described power supply changeover device when stable state.
The quick response device of aforesaid switch type power converter, wherein said regulating circuit comprises:
One electric capacity;
One current source to described electric capacity charging, when the voltage on the described electric capacity reaches a critical value, finishes described quick response when described quick response is triggered.
The quick response device of aforesaid switch type power converter, wherein said electric capacity are variable capacitance.
The quick response device of aforesaid switch type power converter, wherein said current source are variable current source.
The quick response device of aforesaid switch type power converter, wherein said critical value is variable.
The quick response device of aforesaid switch type power converter, comprise more that wherein a flip-flop exports a signal, described signal transfers second logic state to by first logic state when described quick response is triggered, when the voltage on described electric capacity reached described critical value, described signal transferred described first logic state to finish described quick response by described second logic state.
A kind of fast response method of switch type power converter is characterized in that, comprises the following steps:
First step: the output voltage that detects described power supply changeover device is to trigger response fast when the load instantaneous;
Second step: the time of regulating described quick response.
The fast response method of switch type power converter of the present invention can also be further achieved by the following technical measures.
The fast response method of aforesaid switch type power converter, the described output voltage of wherein said detection comprises with the step that triggers response fast when the load instantaneous:
First step: be offset described output voltage and produce an offset voltage;
Second step: a more described offset voltage and a reference voltage, when described offset voltage is lower than described reference voltage, trigger described quick response.
The fast response method of aforesaid switch type power converter comprises more that wherein setting described reference voltage equals the described output voltage of described power supply changeover device when stable state.
The fast response method of aforesaid switch type power converter, the step of the time of the described quick response of wherein said adjusting comprises:
First step: when described quick response is triggered, provide an electric current that one electric capacity is charged;
Second step: the voltage on described electric capacity finishes described quick response during greater than a critical value.
The fast response method of aforesaid switch type power converter wherein also comprises and regulates described electric current to regulate the time of described quick response.
The fast response method of aforesaid switch type power converter, the wherein said capacitance that changes described electric capacity that more comprises is to regulate the time of described quick response.
The fast response method of aforesaid switch type power converter wherein more comprises changing described critical value to regulate the time of described quick response.
After adopting technique scheme, the quick response device of switch type power converter of the present invention has the following advantages:
1. can accurately trigger described quick response.
2. the energy regulating circuit can be controlled the time length of described quick response.
3. avoid hanging down the situation of super or resilience.
Description of drawings
Fig. 1 shows traditional heterogeneous switch type power converter;
The oscillogram of signal in Fig. 2 displayed map 1;
Fig. 3 shows a kind of known to realize the adaptation phase alignment circuit of response fast;
Fig. 4 shows that the present invention is applied in the quick response device of switch type power converter;
The embodiment of voltage detecting circuit in Fig. 5 displayed map 4;
The embodiment of fast response time regulating circuit in Fig. 6 displayed map 4;
The oscillogram of signal in Fig. 7 displayed map 6.
Embodiment
Below in conjunction with embodiment and accompanying drawing thereof the present invention is illustrated further.
Now see also Fig. 4, Fig. 4 shows that the present invention is applied in the quick response device of switch type power converter, described power supply changeover device comprises that a plurality of channels 54 are to provide output voltage V core, described quick response device comprises that voltage detecting circuit 50 directly detects output voltage V core to judge whether to take place load instantaneous, when output voltage V core is lower than a critical value, described voltage slowdown monitoring circuit 50 is sent quick response signal Vqr, and the operating time that fast response time regulating circuit 52 is regulated quick response signal Vqr produces quick response signal QR and opens in a plurality of channels 54 at least one.The embodiment of voltage detecting circuit in Fig. 5 displayed map 4, it comprises that off-centre circuit 5002 produces offset voltage Vcf in order to skew output voltage V core, described off-centre circuit 5002 comprise current source 5004 provide electric current I 1 to resistance R to produce voltage Vofs=I1 * R, so offset voltage Vcf=Vcore+Vofs, comparator 5006 is offset voltage Vcf and reference voltage Vref generation signal Vqr relatively, wherein, output voltage V core when described reference voltage Vref equals described power supply changeover device and is in stable state, suppose voltage Vofs＞0, then at stable state hour offset voltage Vcf greater than reference voltage Vref, so signal Vqr is a low level, when load instantaneous takes place when, output voltage V core descends, the amount that descends as output voltage V core is during greater than voltage Vofs, offset voltage Vcf will be lower than reference voltage Vref, so signal Vqr will transfer high levle to trigger quick response, the outside that resistance R in the off-centre circuit 5002 or current source 5004 can be placed on chip changes the size of resistance value or electric current I 1 for the user, and then regulation voltage Vofs triggers the time point of response fast with control.
See also Fig. 6 and Fig. 7 again, the embodiment of fast response time regulating circuit in Fig. 6 displayed map 4, the oscillogram of signal in Fig. 7 displayed map 6.The mode of realization fast response time regulating circuit 52 has a variety of, and one of them utilizes the simulation one shots exactly.As shown in Figure 6, the input C of described flip-flop 5202 receives the signal Vqr from voltage detecting circuit 50, NOR gate 5204 produces signal SL2 according to the signal SL1 on signal Vqr and the flip-flop 5202 output Q, described inverter 5206 is with the quick response signal QR of the anti-phase generation of signal SL2, the output QB of flip-flop 5202 sends signal Vg diverter switch 5208 discharging and recharging with control capacitance C, current source 5210 provides electric current I 2 pairs of capacitor C chargings, inverter 5212 and 5214 produces signal SL3 according to the voltage Vc on the capacitor C, NOR gate 5218 produces signal SL4 according to signal SL3 and power switch signal Power_on_reset, and signal SL4 is through inverter 5216 anti-phase back generation reset signal Sreset replacement flip-flops 5202.As shown in Figure 7, described waveform 60 is quick response signal Vqr, and waveform 62 is signal Vg, and waveform 64 is voltage Vc, and waveform 66 is reset signal Sreset, and waveform 68 is quick response signal QR.Behind electric power starting, when if the signal Vqr on the input C of flip-flop 5202 transfers high levle to, shown in waveform 60 and time t1, response signal QR will transfer high levle to trigger quick response fast, shown in waveform 68, and signal Vg will transfer low level to close (turn off) switch 5208, shown in waveform 62, therefore the voltage Vc on the capacitor C begins to rise, shown in waveform 64, between the voltage Vc rising stage, because signal SL1 maintains high levle, therefore response signal QR also maintains high levle fast, in voltage Vc reaches inverter 5212 during the predetermined target value Vtrip of institute, shown in time t2, inverter 5212 will be sent the signal of low level, thereby make reset signal Sreset transfer high levle to replacement flip-flop 5202, shown in waveform 66, therefore signal SL1 transfers low level to and makes quick response signal QR also transfer low level to finishing quick response, synchronous signal Vg also transfer to high levle to open switch 5208 so that the capacitor C discharge.Can it is evident that by Fig. 6 and Fig. 7, fast the time of response
Δ t=(C * Vtrip)/I2 formula 2
From formula 2 as can be known, change the time Δ t that capacitor C, electric current I 2 and desired value Vtrip can regulate quick response, therefore can be by wherein at least one changes the time Δ t of quick response from outside adjustment capacitor C, electric current I 2 and desired value Vtrip.
Above embodiment is only for the usefulness that the present invention is described, but not limitation of the present invention, person skilled in the relevant technique under the situation that does not break away from the spirit and scope of the present invention, can also be made various conversion or variation.Therefore, all technical schemes that are equal to also should belong to category of the present invention, should be limited by each claim.
The element numbers explanation
10 power supply changeover devices
12 reference voltage generators
14 error amplifiers
16 sawtooth generators
The 18PWM comparator
The 20PWM comparator
22 passages
24 passages
The waveform of 26 output voltage V core
The waveform of 28 sawtooth waveforms Vramp1
The waveform of 30 sawtooth waveforms Vramp2
The waveform of 32 error signal Vcomp
The waveform of 34 signal Vpwm1
The waveform of 36 signal Vpwm1
40 adapt to the phase alignment circuit
42 error amplifiers
44 low pass filters
46 comparators
48 current sources
50 voltage detecting circuits
5002 off-centre circuits
5004 current sources
5006 comparators
52 fast response time regulating circuits
5202 flip-flops
5204 NOR gate
5206 inverters
5208 switches
5210 current sources
5212 inverters
5214 inverters
5216 inverters
5218 NOR gate
54 passages
The waveform of 60 quick response signal Vqr
The waveform of 62 signal Vg
The waveform of 64 voltage Vc
The waveform of 66 reset signal Sreset
The waveform of 68 quick response signal QR
Claims (13)
1. the quick response device of a switch type power converter comprises a testing circuit and a regulating circuit, it is characterized in that:
The output voltage that described testing circuit detects described power supply changeover device is to trigger response fast when the load instantaneous;
Described regulating circuit is regulated the time of described quick response, and described regulating circuit comprises:
One electric capacity;
One current source to described electric capacity charging, when the voltage on the described electric capacity reaches a critical value, finishes described quick response when described quick response is triggered.
2. quick response device as claimed in claim 1 is characterized in that, described testing circuit comprises:
One off-centre circuit is offset described output voltage and produces an offset voltage;
One comparator, a more described offset voltage and a reference voltage trigger described quick response when described offset voltage is lower than described reference voltage.
3. quick response device as claimed in claim 2 is characterized in that, described reference voltage equals the described output voltage of described power supply changeover device when stable state.
4. quick response device as claimed in claim 1 is characterized in that, described electric capacity is variable capacitance.
5. quick response device as claimed in claim 1 is characterized in that, described current source is a variable current source.
6. quick response device as claimed in claim 1 is characterized in that described critical value is variable.
7. quick response device as claimed in claim 1, it is characterized in that, comprise that more a flip-flop exports a signal, described signal transfers second logic state to by first logic state when described quick response is triggered, when the voltage on described electric capacity reached described critical value, described signal transferred described first logic state to finish described quick response by described second logic state.
8. the fast response method of a switch type power converter is characterized in that, comprises the following steps:
First step: the output voltage that detects described power supply changeover device is to trigger response fast when the load instantaneous;
Second step: the time of regulating described quick response;
Wherein, the step of the time of the described quick response of described adjusting comprises:
When described quick response is triggered, provide an electric current that one electric capacity is charged;
Voltage on described electric capacity finishes described quick response during greater than a critical value.
9. fast response method as claimed in claim 8 is characterized in that, the described output voltage of described detection comprises with the step that triggers response fast when the load instantaneous:
First step: be offset described output voltage and produce an offset voltage;
Second step: a more described offset voltage and a reference voltage, when described offset voltage is lower than described reference voltage, trigger described quick response.
10. fast response method as claimed in claim 9 is characterized in that, comprises that more setting described reference voltage equals the described output voltage of described power supply changeover device when stable state.
11. fast response method as claimed in claim 8 is characterized in that, also comprises regulating described electric current to regulate the time of described quick response.
12. fast response method as claimed in claim 8 is characterized in that, comprises that more the capacitance that changes described electric capacity is to regulate the time of described quick response.
13. fast response method as claimed in claim 8 is characterized in that, more comprises changing described critical value to regulate the time of described quick response.
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| CN 200810125924 CN101599692B (en) | 2008-06-04 | 2008-06-04 | Quick response device and method of switching power converter |
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| CN102136793B (en) * | 2010-01-21 | 2014-12-03 | 立锜科技股份有限公司 | Frequency generator and phase interleaving frequency synchronization device and method |
| TWI456882B (en) * | 2010-06-25 | 2014-10-11 | Richtek Technology Corp | Voltage regulator and control circuit and method therefor |
| TWI473397B (en) * | 2012-11-01 | 2015-02-11 | Luxmill Electronic Co Ltd | Current control circuit and control method for a power converter |
| US10886774B2 (en) * | 2018-10-30 | 2021-01-05 | Nxp Usa, Inc. | Method and apparatus to switch power supply for low current standby operation |
| TWI835200B (en) * | 2022-01-26 | 2024-03-11 | 立錡科技股份有限公司 | Quick response switching power converter and conversion control circuit thereof |
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| TW200412484A (en) * | 2003-01-02 | 2004-07-16 | Richtek Technology Corp | Switching type voltage regulator and its method |
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| TW200412484A (en) * | 2003-01-02 | 2004-07-16 | Richtek Technology Corp | Switching type voltage regulator and its method |
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