CN104333219A - Phase adjusting circuit for power converter, power converter and control method thereof - Google Patents
Phase adjusting circuit for power converter, power converter and control method thereof Download PDFInfo
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- CN104333219A CN104333219A CN201310309117.3A CN201310309117A CN104333219A CN 104333219 A CN104333219 A CN 104333219A CN 201310309117 A CN201310309117 A CN 201310309117A CN 104333219 A CN104333219 A CN 104333219A
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Abstract
The invention provides a phase adjusting circuit for a power converter, the power converter and a control method thereof. The control method comprises the steps of generating a delay signal according to an error signal, wherein the error signal is related with the output voltage of the power converter; amplifying a difference between the error signal and the delay signal; and supplying a control signal according to the amplified difference and the error signal. The phase of the control signal is in front of the phase of the error signal. The control signal is used for increasing response speed of the power converter.
Description
Technical field
The invention relates to a kind of power supply changeover device, espespecially a kind of phase-adjusting circuit of power supply changeover device, power supply changeover device and control method thereof.
Background technology
Fig. 1 is the schematic diagram of existing power supply changeover device.Fig. 2 is the waveform schematic diagram of existing power supply changeover device.Please refer to Fig. 1 and Fig. 2.The design of existing power supply changeover device 100 often adopts the framework of fixing ON time.Comparator 110 comparison error signal Xerr and ramp signal Xramp produces comparison signal Xcm.Time control circuit 120 produces pulse-width signal Xpwm according to comparison signal Xcm, input voltage vin and output voltage Vout, wherein the width of the ON time Ton in each cycle of pulse-width signal Xpwm is fixed value, and the width of ON time Ton is relevant with output voltage Vout with input voltage vin.
In power supply changeover device 100, comparison signal Xcm is produced by error signal Xerr and ramp signal Xramp, and the ON time Ton of when output pulse width modulation signal Xpwm is decided by comparison signal Xcm, wherein the size of error signal Xerr is relevant with feedback signal Vfb and reference voltage Vref.And when determining the ON time Ton of output pulse width modulation signal Xpwm, time control circuit 120 starts to calculate and generates ON time Ton, and the ON time Ton in each cycle in pulse-width signal Xpwm is fixing.
Though the operation framework of existing pulse-width modulation can reach the effect of fixed frequency, but when the equivalent series resistance ESR of the capacitor CL on the output of the power supply changeover device 100 and equivalent series resistance DCR of inductor L is very little, the energy that capacitor CL and inductor L compensates when changing in response to load transients has delay, and therefore feedback signal Vfb, error signal Xerr also have delay.Originally the error signal Xerr produced through compensating circuit 130 can not be used for restraining output voltage Vout, so the waveform of output voltage Vout has situation of significantly vibrating.
Summary of the invention
In view of this, the present invention proposes a kind of phase-adjusting circuit of power supply changeover device, power supply changeover device and control method thereof, to solve the problem that prior art is addressed.
The present invention proposes a kind of phase-adjusting circuit of power supply changeover device, to be delayed signal according to error signal, difference between fault in enlargement signal and inhibit signal, to provide control signal according to the difference through amplifying and error signal, wherein error signal is relevant with the output voltage of power supply changeover device.
In one embodiment of this invention, phase-adjusting circuit comprises the first amplifier, the first resistance, the first capacitor and Voltage-controlled Current Source; The first input end of the first amplifier receives error signal; The first end of the first resistance couples the second input and the output of the first amplifier; First capacitor is coupled between the second end of the first resistance and earth terminal; The first input end of Voltage-controlled Current Source couples the first end of the first resistance, second end of the second input coupling resistance of Voltage-controlled Current Source, first output of Voltage-controlled Current Source exports control signal, and the second output of Voltage-controlled Current Source couples the first input end of the first amplifier.
In one embodiment of this invention, phase-adjusting circuit comprises the second amplifier, the second resistance and the second capacitor; The first input end of the second amplifier receives error signal, and the output of the second amplifier exports control signal; Second resistance is coupled between the second input of the second amplifier and output; Second capacitor is coupled between the second input of the second amplifier and earth terminal.
In one embodiment of this invention, phase-adjusting circuit comprises current source, the first current mirror, a P type metal-oxide half field effect transistor, the 3rd capacitor, the first N-type metal-oxide half field effect transistor, the 3rd resistance and the second current mirror; First current mirror is coupled between operating voltage and current source; The source electrode of the one P type metal-oxide half field effect transistor couples the first current mirror; The grid of the one P type metal-oxide half field effect transistor receives error signal; The first end of the 3rd capacitor couples operating voltage, and the second end of the 3rd capacitor couples the source electrode of a P type metal-oxide half field effect transistor; The drain-source pole of the first N-type metal-oxide half field effect transistor couples operating voltage, and the grid of the first N-type metal-oxide half field effect transistor couples the grid of a P type metal-oxide half field effect transistor; The first end of the 3rd resistance couples the source electrode of the first N-type metal-oxide half field effect transistor; Second current mirror couples the drain electrode of a P type metal-oxide half field effect transistor, the second end of the 3rd resistance and earth terminal, and the place of coupling of the second current mirror and the 3rd resistance produces control signal.
In one embodiment of this invention, the phase-lead of control signal is in the phase place of error signal.
The present invention separately proposes a kind of power supply changeover device.Power supply changeover device comprises the first amplifier, phase-adjusting circuit, comparator and control circuit.The first input end of the first amplifier receives reference voltage, the second input receiving feedback signals of the first amplifier, and feedback signal is relevant with the output voltage of power supply changeover device, the output output error signal of the first amplifier; Phase-adjusting circuit couples the first amplifier, and to be delayed signal according to error signal, and the difference between fault in enlargement signal and inhibit signal, to provide control signal according to the difference through amplifying and error signal; The first input end reception control signal of comparator, the second termination of comparator receives ramp signal, and the output of comparator exports comparison signal; Control circuit produces pulse-width signal according to comparison signal, to control power supply changeover device.
The present invention separately proposes a kind of control method of power supply changeover device, and it comprises the following steps: to be delayed signal according to error signal, and wherein error signal is relevant with the output voltage of power supply changeover device; Difference between fault in enlargement signal and inhibit signal; And provide control signal according to the difference through amplifying and error signal.
Based on above-mentioned, the phase-adjusting circuit of power supply changeover device of the present invention, power supply changeover device and control method thereof convert error signal to new control signal by phase-lead mechanism, and this control signal is used for replacing original error signal.Because when carrying out circuit controls, control signal has phase compensation effect, therefore can the output voltage of more Fast Convergent power supply changeover device, transient response is also more stable.
It is to be understood that foregoing description and following embodiment are only exemplary and illustrative, its can not limit the present invention for advocate scope.
Accompanying drawing explanation
Institute's accompanying drawings is below a part for specification of the present invention, it illustrates embodiments of the invention, and accompanying drawing is used for principle of the present invention is described together with the description of specification.
Fig. 1 is the schematic diagram of existing power supply changeover device;
Fig. 2 is the waveform schematic diagram of existing power supply changeover device;
Fig. 3 is the configuration diagram of the power supply changeover device according to one embodiment of the invention;
Fig. 4 is the circuit diagram of the phase-adjusting circuit according to first embodiment of the invention;
Fig. 5 is the circuit diagram of the phase-adjusting circuit according to second embodiment of the invention;
Fig. 6 is the waveform analysis figure of the power supply changeover device according to one embodiment of the invention;
Fig. 7 is relative to the waveform comparison figure of prior art according to the power supply changeover device of one embodiment of the invention;
Fig. 8 is the flow chart of the control method of power supply changeover device according to one embodiment of the invention;
Fig. 9 is the circuit diagram of the phase-adjusting circuit according to third embodiment of the invention.
Description of reference numerals:
10: driver;
20: output stage;
21: high side switches;
22: lower edge switch;
30: feedback circuit;
40: feedback control circuit;
61,63,65,67: waveform;
71 ~ 74: waveform;
91: current source;
92,93: current mirror;
100: power supply changeover device;
110: comparator;
120: time control circuit;
130: compensating circuit;
300: power supply changeover device;
310: amplifier;
320,320A, 320B, 320C: phase-adjusting circuit;
321: amplifier;
322: Voltage-controlled Current Source;
323: amplifier;
330: comparator;
340: control circuit;
Cdelay: capacitor;
CL: capacitor;
DCR: equivalent series resistance;
ESR: equivalent series resistance;
GND: earth terminal;
Ib: electric current;
IL: inductive current;
Iload: load current;
K, K1: multiplying power;
L: inductor;
LG: lower edge switch control signal;
R, Rdelay: resistance;
MN1 ~ MN4, MNC:N type metal-oxide half field effect transistor;
MP1 ~ MP4, MPC:P type metal-oxide half field effect transistor;
S801 ~ S805: step;
Ton: ON time;
UG: high side switches control signal;
Vcm: comparison signal;
Verr: error signal;
Verr_delay: inhibit signal;
Verr_ofs: shifted signal;
VDD: operating voltage;
Vfb: feedback signal;
Vin: input voltage;
Vnew_err: control signal;
Vpwm: pulse-width signal;
Vout: output voltage;
Vramp: ramp signal;
Vref: reference voltage;
Xcm: comparison signal;
Xerr: error signal;
Xpwm: pulse-width signal;
Xramp: ramp signal;
δ: difference.
Embodiment
Now with detailed reference to one exemplary embodiment of the present invention, and the example of described one exemplary embodiment is described in the accompanying drawings.In addition, in graphic and execution mode use element/component that is identical or like numerals will to be used to represent identical or similar portions.
In following all embodiments, when element is regarded as " connection " or " coupling " to another element, it can be and directly connects or be coupled to another element, maybe may there is intervenient element.Term " circuit " can be expressed as at least one element or multiple element, or initiatively and/or the passive and element that is coupled in together to provide proper function.Term " signal " can be expressed as at least one electric current, voltage, load, temperature, data or other signals.
Fig. 3 is the configuration diagram of the power supply changeover device according to one embodiment of the invention.Refer to Fig. 3.Power supply changeover device 300 comprises driver 10, output stage 20, inductor L, capacitor CL, feedback circuit 30 and feedback control circuit 40.The first end of the high side switches (high side switch) 21 in output stage 20 receives input voltage vin.Lower edge switch (low side switch) 22 is coupled between the second end of high side switches 21 and earth terminal GND.
In one embodiment of this invention, feedback control circuit 40 and driver 10 can form a DC-DC controller (DC-DC Controller), in addition, in implementing one, when DC-DC controller is implemented at integrated circuit, the compensating circuit 130 in feedback control circuit 40 can be arranged on the outside of said integrated circuit.In addition, feedback control circuit 40, driver 10 and output stage 20 can form a DC-DC converter (DC-DC Converter), when DC-DC converter is implemented at integrated circuit, the compensating circuit 130 in feedback control circuit 40 can be arranged on the outside of said integrated circuit.
Feedback control circuit 40 comprises amplifier 310, phase-adjusting circuit 320, comparator 330 and control circuit 340.Feedback control circuit 40 also can comprise compensating circuit 130.The first input end of amplifier 310 receives reference voltage Vref.Second input receiving feedback signals Vfb of amplifier 310.Feedback signal Vfb is relevant with the output voltage Vout of power supply changeover device 300.In other embodiments, feedback signal Vfb also can be directly output voltage Vout.The output output error signal Verr of amplifier 310.Phase-adjusting circuit 320 couples amplifier 310, provides control signal Vnew_err according to error signal Verr.The first input end reception control signal Vnew_err of comparator 330.Second termination of comparator 330 receives ramp signal Vramp.The output of comparator 330 exports comparison signal Vcm.Control circuit 340 produces pulse-width signal Vpwm, to control power supply changeover device 300 according to comparison signal Vcm.In one embodiment of this invention, pulse-width signal Vpwm can be constant conduction (ConstantOn Time, referred to as COT) signal.In other embodiments, pulse-width signal Vpwm can be the signal of other types, and the present invention is not as limit.
It is worth mentioning that, the phase-lead of control signal Vnew_err is in the phase place of error signal Verr.
Driver 10 produces high side switches control signal UG and lower edge switch control signal LG, to control high side switches 21 and lower edge switch 22 respectively according to pulse-width signal Vpwm.Output stage 20 is in order to carry out the conversion of direct current to direct current to input voltage vin, thus power supply changeover device 300 can produce output voltage Vout and export load to.
In one embodiment of this invention, phase-adjusting circuit 320 also can be described as delay disposal circuit, it is in order to carry out delay disposal by error signal Verr, then, again the error signal Verr after delay is added with error signal Verr originally, to form new error signal Vnew_err, namely above-mentioned control signal Vnew_err.
Fig. 4 is the circuit diagram of the phase-adjusting circuit according to first embodiment of the invention.Refer to Fig. 4.Phase-adjusting circuit 320A can be applicable to the framework of the power supply changeover device 300 of Fig. 3.Phase-adjusting circuit 320A comprises amplifier 321, resistance Rdelay, capacitor Cdelay and Voltage-controlled Current Source (voltage control voltage source, referred to as VCVS) 322.
The first input end of amplifier 321 receives error signal Verr.Error signal Verr is relevant with the output voltage Vout of power supply changeover device 300.
The first end of resistance Rdelay couples the second input and the output of amplifier 321.Capacitor Cdelay is coupled between second end of resistance Rdelay and earth terminal GND.The first end of the first input end coupling resistance Rdelay of Voltage-controlled Current Source 322.Second end of the second input coupling resistance Rdelay of Voltage-controlled Current Source 322.First output of Voltage-controlled Current Source 322 exports control signal Vnew_err.Second output of Voltage-controlled Current Source 322 couples the first input end of amplifier 321.
Phase-adjusting circuit 320A to be delayed signal Verr_delay according to error signal Verr, and the numerical value that the value of delta between error signal Verr and inhibit signal Verr_delay is multiplied by multiplying power K(K by Voltage-controlled Current Source 322 is greater than 1) and amplify.In addition, if the numerical value of multiplying power K between 0 as between 1, then value of delta can be reduced.Phase-adjusting circuit 320A provides control signal Vnew_err according to the above-mentioned difference (K* δ) through amplifying with error signal Verr.The phase-lead of this control signal Vnew_err is in the phase place of error signal Verr.
Fig. 5 is the circuit diagram of the phase-adjusting circuit according to second embodiment of the invention.Refer to Fig. 5.Phase-adjusting circuit 320B can be applicable to the framework of the power supply changeover device 300 of Fig. 3.Phase-adjusting circuit 320B comprises amplifier 323, resistance Rdelay and capacitor Cdelay.Resistance Rdelay is coupled between the second input of amplifier 323 and output.Capacitor Cdelay is coupled between the second input of amplifier 323 and earth terminal GND.The first input end of amplifier 323 receives error signal Verr.Inhibit signal Verr_delay is the delayed signal of error signal Verr.
Suppose that the magnification ratio multiplying power of amplifier 323 is K, then the voltage on resistance Rdelay is K* δ, wherein δ=Verr-Verr_delay.The output of amplifier 323 produce the phase-lead error signal Verr of new control signal Vnew_err.In addition, amplifier 323 can be trsanscondutance amplifier.
Fig. 9 is the circuit diagram of the phase-adjusting circuit according to third embodiment of the invention.Refer to Fig. 9.Phase-adjusting circuit 320C can be applicable to the framework of the power supply changeover device 300 of Fig. 3.Phase-adjusting circuit 320C comprises current source 91, current mirror 92, P type metal-oxide half field effect transistor MPC, capacitor Cdelay, N-type metal-oxide half field effect transistor MNC, resistance R and current mirror 93.Current mirror 92 is formed by P type metal-oxide half field effect transistor MP1, MP2, MP3 and MP4.Current mirror 93 is formed by N-type metal-oxide half field effect transistor MN1, MN2, MN3 and MN4.
Current mirror 92 is coupled between operating voltage VDD and current source 91.The source electrode of P type metal-oxide half field effect transistor MPC couples current mirror 92.The grid of P type metal-oxide half field effect transistor MPC receives error signal Verr.The first end of capacitor Cdelay couples operating voltage VDD.Second end of capacitor Cdelay couples the source electrode of P type metal-oxide half field effect transistor MPC.The drain-source pole of N-type metal-oxide half field effect transistor MNC couples operating voltage VDD.The grid of N-type metal-oxide half field effect transistor MNC couples the grid of P type metal-oxide half field effect transistor MPC.The first end of resistance R couples the source electrode of N-type metal-oxide half field effect transistor MNC.Current mirror 93 couples the drain electrode of P type metal-oxide half field effect transistor MPC, second end of resistance R and earth terminal GND.Current mirror 93 produces control signal Vnew_err with the place of coupling of resistance R.
The operation principle of phase-adjusting circuit 320C is as follows.Current mirror 92 will determine the source electrode of electric current I B mirror (mirror) to P type metal-oxide half field effect transistor MPC.Mirrored current is multiplied by multiplying power K1 for determining current Ib.Error signal Verr postpones to provide inhibit signal Verr_delay through capacitor Cdelay.The small-signal of capacitor Cdelay adjustable delay signal Verr_delay postpones ratio.
Error signal Verr follows (sourcefollow) by the source electrode of N-type metal-oxide half field effect transistor MNC and produces shifted signal Verr_ofs.Shifted signal Verr_ofs is the in-phase signal of error signal Verr.The current mirror flowing through P type metal-oxide half field effect transistor MPC is incident upon the source electrode of N-type metal-oxide half field effect transistor MNC by current mirror 93.Value of delta (δ=Verr-Verr_delay) changes into current signal via P type metal-oxide half field effect transistor MPC.Current signal flows through resistance R to change into voltage signal by current mirror 93 again, and is added on shifted signal Verr_ofs, to obtain new control signal Vnew_err.The phase-lead error signal Verr of control signal Vnew_err phase place.
Fig. 6 is the waveform analysis figure of the power supply changeover device according to one embodiment of the invention.Please refer to Fig. 3, Fig. 4 and Fig. 6.The embodiment practice according to Fig. 4 carries out following explanation.
Waveform 63,65 is respectively the inductive current IL on load current Iload and inductor L.When load current Iload is determined (waveform 63), the waveform 61 of output voltage Vout can first fall down, and along with the energy changing of inductive current IL, waveform 61 is tending towards a stationary value after shaking again.
In embodiments of the present invention, power supply changeover device 300 utilizes error signal Verr and delayed error signal Verr to calculate difference (voltage difference) δ, δ=Verr-Verr_delay.Value of delta amplified, the numerical value such as value of delta being multiplied by multiplying power K(K is greater than 1).Difference through amplifying is K* (Verr-Verr_delay), as shown in waveform 67.On waveform 67 and horizontal line, represent that energy is greater than load current Iload with positive sign (+).Under waveform 67 and horizontal line, represent that energy is less than load current Iload with negative sign (-).
Waveform 67 is added with original error signal Verr and produces new control signal Vnew_err.The control signal Vnew_err the produced error signal Verr that phase-lead is original significantly, therefore can reach the output voltage Vout of accelerating ated test power supply changeover device 300, accelerates transient response speed, and can provide the stability better than conventional art.
Fig. 7 is compared to the waveform comparison figure of prior art according to the power supply changeover device of one embodiment of the invention.Please refer to Fig. 1, Fig. 3 and Fig. 7.In the prior art, adopt error signal Xerr and ramp signal Xramp to decide the control mode of pulse-width modulation, output voltage Vout, inductive current IL are respectively waveform 71,73.Power supply changeover device 300 adopts control signal Vnew_err and ramp signal Vramp to decide the control mode of pulse-width modulation, and output voltage Vout, inductive current IL are respectively waveform 72,74.
The relatively waveform of power supply changeover device 300 and output voltage Vout of the prior art, waveform 72 has less vibration compared with waveform 71 significantly.Compare the waveform of power supply changeover device 300 and inductive current IL of the prior art again, waveform 74 has less vibration compared with waveform 73 significantly.Control signal Vnew_err due to power supply changeover device 300 has the compensation effect of loop phase, therefore can the output voltage Vout of more Fast Convergent power supply changeover device 300 when carrying out circuit controls, and transient response is also more stable.
Based on the content that above-described embodiment discloses, can converge whole go out a kind of control method of general power supply changeover device.Clearer, Fig. 8 is the flow chart of the control method of the power supply changeover device of one embodiment of the invention.Please refer to Fig. 3 and Fig. 8, the control method of the present embodiment can comprise the following steps.
As shown in S801, to be delayed signal Verr_delay according to error signal Verr, wherein error signal Verr is relevant with the output voltage Vout of power supply changeover device 300.
Then as shown in S803, the difference between fault in enlargement signal Verr and inhibit signal Verr_delay.
As shown in S805, provide control signal Vnew_err according to the above-mentioned difference through amplification and error signal Verr.The phase-lead of control signal Vnew_err is in the phase place of error signal Verr.
In sum, the phase-adjusting circuit of power supply changeover device of the present invention, power supply changeover device and control method thereof convert error signal to new control signal by phase-lead mechanism, and this control signal is used for replacing original error signal.Because when carrying out circuit controls, control signal has phase compensation effect, therefore can the output voltage of more Fast Convergent power supply changeover device, transient response is also more stable.On the other hand, the phase-adjusting circuit of power supply changeover device of the present invention can be applied to the framework of existing constant on-time (COT).
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (11)
1. the phase-adjusting circuit of a power supply changeover device, it is characterized in that, an inhibit signal is produced according to an error signal, and a difference of amplifying between this error signal and this inhibit signal, to provide a control signal according to this difference and this error signal, wherein this error signal is relevant with an output voltage of this power supply changeover device.
2. phase-adjusting circuit according to claim 1, is characterized in that, comprising:
One first amplifier, its first input end receives this error signal;
One first resistance, its first end couples the second input and the output of this first amplifier;
One first capacitor, is coupled between the second end of this first resistance and an earth terminal; And
One Voltage-controlled Current Source, its first input end couples the first end of this first resistance, and its second input couples the second end of this resistance, and its first output exports this control signal, and its second output couples the first input end of this first amplifier.
3. phase-adjusting circuit according to claim 1, is characterized in that, comprising:
One second amplifier, its first input end receives this error signal, and its output exports this control signal;
One second resistance, is coupled between the second input of this second amplifier and output; And
One second capacitor, is coupled between the second input of this second amplifier and an earth terminal.
4. phase-adjusting circuit according to claim 1, is characterized in that, comprising:
One current source;
One first current mirror, is coupled between an operating voltage and this current source;
One the one P type metal-oxide half field effect transistor, its source electrode couples this first current mirror, and its grid receives this error signal;
One the 3rd capacitor, its first end couples this operating voltage, and its second end couples the source electrode of a P type metal-oxide half field effect transistor;
One first N-type metal-oxide half field effect transistor, its drain-source pole couples this operating voltage, and its grid couples the grid of a P type metal-oxide half field effect transistor;
One the 3rd resistance, its first end couples the source electrode of this first N-type metal-oxide half field effect transistor; And
One second current mirror, couple the drain electrode of a P type metal-oxide half field effect transistor, the second end of the 3rd resistance and earth terminal, wherein the place of coupling of this second current mirror and the 3rd resistance produces this control signal.
5. phase-adjusting circuit according to claim 1, is characterized in that, the phase-lead of this control signal is in the phase place of this error signal.
6. a power supply changeover device, is characterized in that, comprising:
One first amplifier, its first input end receives a reference voltage, and its second input receives a feedback signal, and its output exports an error signal, and wherein this feedback signal is relevant with an output voltage of this power supply changeover device;
One phase-adjusting circuit, couples this first amplifier, and produces an inhibit signal according to this error signal, and amplifies the difference between this error signal and this inhibit signal, to provide a control signal according to this difference and this error signal;
One comparator, its first input end receives this control signal, and its second termination receives a ramp signal, and its output exports a comparison signal; And
One control circuit, produces a pulse-width signal according to this comparison signal, to control this power supply changeover device.
7. power supply changeover device according to claim 6, is characterized in that, this phase-adjusting circuit comprises:
One second amplifier, its first input end receives this error signal;
One first resistance, its first end couples the second input and the output of this second amplifier;
One first capacitor, is coupled between the second end of this first resistance and an earth terminal; And
One Voltage-controlled Current Source, its first input end couples the first end of this first resistance, and its second input couples the second end of this resistance, and its first output exports this control signal, and its second output couples the first input end of this second amplifier.
8. power supply changeover device according to claim 6, is characterized in that, this phase-adjusting circuit comprises:
One the 3rd amplifier, its first input end receives this error signal, couples one second resistance between its second input and output, and its output is for exporting this control signal; And
One second capacitor, between the second input being coupled to the 3rd amplifier and an earth terminal.
One second current mirror, couple the drain electrode of a P type metal-oxide half field effect transistor, the second end of the 3rd resistance and earth terminal, wherein the place of coupling of this second current mirror and the 3rd resistance produces this control signal.
9. power supply changeover device according to claim 6, is characterized in that, the phase-lead of this control signal is in the phase place of this error signal.
10. a control method for power supply changeover device, is characterized in that, comprising:
Produce an inhibit signal according to an error signal, wherein this error signal is relevant with an output voltage of this power supply changeover device;
Amplify the difference between this error signal and this inhibit signal; And
A control signal is provided according to this difference and this error signal.
11. control methods according to claim 10, is characterized in that, the phase-lead of this control signal is in the phase place of this error signal.
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| CN201310309117.3A CN104333219B (en) | 2013-07-22 | 2013-07-22 | The phase-adjusting circuit of power supply changeover device, power supply changeover device and its control method |
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