CN104158398A - V<2>-PT modulation method of switch power supply, and V<2>-PT modulation device of switch power supply - Google Patents
V<2>-PT modulation method of switch power supply, and V<2>-PT modulation device of switch power supply Download PDFInfo
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- CN104158398A CN104158398A CN201410394159.6A CN201410394159A CN104158398A CN 104158398 A CN104158398 A CN 104158398A CN 201410394159 A CN201410394159 A CN 201410394159A CN 104158398 A CN104158398 A CN 104158398A
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Abstract
The present invention discloses a V<2>-PT modulation method of a switch power supply, and a V<2>-PT modulation device of the switch power supply. The method is characterized in that when an input voltage or an output voltage changes suddenly, a V<2> control device is added in front of a PT control device to improve the adjustment rate of the output voltage, and comprises the steps of turning on a switching tube, using a power supply E to charge an inductor L, and building up the output voltage; after an error of the output voltage and a reference voltage is amplified, comparing with the output voltage; selecting a corresponding power pulse signal according to a signal outputted by a comparator; sending the corresponding power pulse signal to a control circuit to drive a field effect transistor to work, so that the whole circuit forms the closed control. The switch power supply of the present invention enables the adjustment rate of the output voltage to be improved. The most important characteristics of the V<2>-PT modulation are that the application range of the device can be expanded by changing the adjustment rate of the output voltage, the V<2>-PT modulation is more suitable for being used in a voltage regulator module (VRM) by being compared with the general PT control, and the V<2>-PT modulation has a larger reference value for designing the VRM.
Description
Technical field
The present invention relates to Switching Power Supply, particularly a kind of Switching Power Supply
v 2-PT modulator approach and device thereof.
Background technology
Along with the high speed development of power electronic technology, power electronic equipment and people's work, the relation of life are day by day close, and electronic equipment all be unable to do without reliable power supply.Because Switching Power Supply has the advantage of the aspects such as efficiency is high, volume is little with respect to conventional linear stabilized voltage power supply, make switch power technology become gradually the focus of people's application and research.The develop rapidly of power electronic device provides a very large development space to Switching Power Supply especially, makes it little towards volume, and lightweight, efficiency is high, and the large future development that waits of power density, causes insider's extensive concern, has a extensive future.Switching Power Supply mainly consists of power inverter and controller two parts.Power inverter is called again power circuit, mainly comprises switching device, device for transformer and current rectifying and wave filtering circuit.Common power inverter topological structure has Buck converter (buck converter), Boost converter (booster converter), Buck-Boost converter (buck-boost converter), forward converter, anti exciting converter etc.Controller can input or output the variation of voltage by detection power translation circuit, and produces accordingly the operating state of respective switch signal controlling power conversion circuit switching device, thereby regulates the energy that passes to load to export with stable switch power supply.The control method that the structure of controller and operation principle are adopted by Switching Power Supply determines.For same power circuit topology, adopt different control methods to exert an influence to aspects such as the stable state accuracy of system and dynamic properties, thereby the research of control method seem and become more and more important.At present, a lot of application scenarios need Switching Power Supply to have good transient response speed, and adopt traditional pulse width modulation (PWM) technology to be difficult to meet this requirement; This is with regard to the appearance of the new control method of exigence.And pulse train modulation has advantages of that light-load efficiency is high, be suitable for very much standy operation mode.
Pulse train (Pulse Train, PT) modulation is a kind of frequency conversion, non-linear modulation method.Its operation principle is: when each switch periods starts, clock provides pulse signal, controller sampling and outputting voltage, and when output voltage is during higher than reference voltage, controller produces low-power control impuls as the driving signal of switching tube, and output voltage declines; Otherwise when output voltage is during lower than reference voltage, controller produces high power control impuls as the driving signal of switching tube, output voltage rises.PT modulation technique is fairly simple, and easily realizes.In the lighter situation of load, efficiency is high, and operating frequency is high, and frequency characteristic is good, and power tube on-off times is few, is applicable to small-power power Management IC.
Also there is following deficiency in the pulse train modulation switch converting means using at present in addition: in the topological structure of Switching Power Supply, output voltage is not independent of input voltage and exists, and makes the regulation of its output voltage bad.Thereby limited to a great extent the application in the voltage regulator module (Voltage Regulator Module, VRM) of topological structure that PT controls.
Summary of the invention
The problems referred to above of existing for the modulator approach of Switching Power Supply in prior art and device, the invention provides a kind of Switching Power Supply
v 2-PT modulator approach and device thereof, by adding in PT control device
v 2control technology, makes output voltage have good voltage regulation.
Technical scheme of the present invention is:
A kind of Switching Power Supply
v 2-PT modulator approach, when input voltage or output voltage sudden change, by adding before PT control device
v 2control device, the regulation of raising output voltage, comprises the steps:
Step 1: switching tube S conducting, power supply E charges to inductance L, and output voltage rises;
Step 2: the error of output voltage and reference voltage compares with output voltage after amplifying;
Step 3: select corresponding pulsed power signal according to the signal of comparator output;
Step 4: corresponding pulsed power signal is delivered to control circuit and go to drive field effect transistor work, to make whole circuit form Closed control.
Further, the concrete steps of step 3 are:
When output voltage is greater than error voltage, controller is selected low powder pulsed, and inductance provides energy to load, and output voltage is declined;
When output voltage is less than error voltage, controller produces high power pulse, and inductance absorbs energy to power supply, gives capacitor charging simultaneously, makes output voltage increase.
A kind of Switching Power Supply
v 2-PT modulating device, comprises control circuit and power circuit, described power circuit by inputting, switching device, filter, output connect to form successively, described control circuit comprises
v 2control device, PT control device and drive unit, output,
v 2control device, PT control device, drive unit, switching device connect successively.
Further, be input as input voltage E, described switching device is field effect transistor S and diode D, and described filter is inductance L and capacitor C, described in be output as load R, described in
v 2control device is reference voltage
v ref, error amplifier and comparator, described PT control device is PT control circuit; Annexation is: the drain electrode of the positive pole of input voltage E and switching tube S is joined, negative pole and the anode of diode D, the output negative pole end of one end of capacitor C and load R join; The negative electrode of the source electrode of switching tube S and diode D and one end of inductance L join, and the output cathode end of the other end of inductance L and one end of capacitor C and load R joins; The output of power circuit is connected with the negative terminal of the negative terminal of error amplifier and comparator, the anode of error amplifier connects reference voltage, output connects the anode of comparator, the output of comparator is connected with PT control circuit, the output of PT control circuit is connected with the input of drive unit, and the output of drive circuit is connected with the control grid of switch S.
Compared with prior art, the invention has the beneficial effects as follows:
One, compare with traditional PT control technology, adopt Switching Power Supply of the present invention can improve the regulation of output voltage.
Two,
v 2it is by changing the regulation of output voltage, to expand the range of application of this device that-PT modulates topmost feature, than common PT, controls and is more applied in VRM, and to design, VRM has larger reference value.
Accompanying drawing explanation
Fig. 1 is control system implement device structured flowchart of the present invention;
Fig. 2 is the electrical block diagram of the embodiment of the present invention;
Fig. 3 is the time-domain-simulation oscillogram of the circuit of the embodiment of the present invention;
Fig. 4 is the output voltage waveform of the circuit of the embodiment of the present invention;
Fig. 5 is the transient response of the circuit of the embodiment of the present invention.
In Fig. 3: (a) be converter output voltage time-domain-simulation waveform; (b) be converter inductive current time-domain-simulation waveform; (c) the driving signal time-domain-simulation waveform of exporting for controller.
In Fig. 4: be (a)
v 2-PT controls Buck converter output voltage ripple simulation waveform; (b) for PT controls Buck converter output voltage ripple simulation waveform.
In Fig. 5: (a) be converter inductive current time-domain-simulation waveform; (b) be converter output voltage time-domain-simulation waveform; (c) the driving signal time-domain-simulation waveform of exporting for controller.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Of the present invention is to solve its technical method to be: when input voltage or output voltage sudden change, by adding before PT control device
v 2control device, for improving the regulation of output voltage.The concrete technical scheme adopting is: by output voltage and error voltage comparison, when output voltage is greater than error voltage, controller produces low-power control impuls as the driving signal of switching tube; Otherwise when output voltage is during lower than error voltage, controller produces high power control impuls as the driving signal of switching tube.
Another object of the present invention is that the pulse selecting signal that the ripple voltage of output is controlled as interior ring can regulate input voltage and the impact of load disturbance on output voltage thereof fast, thereby still have with PT, controls suitable good transient response characteristic.This device by input 1, switching device 2, filter 3, output 4,
v 2control device 5, PT device 6 and drive unit 7 form.
Switching Power Supply of the present invention
v 2as shown in Figure 1, in Fig. 1, dotted line frame is control circuit outward to the structure of-PT modulating device, comprising:
v 2control device 5, PT control device 6 and drive unit 7.Annexation:
v 2control device 5 is connected with PT control device 6, after corresponding control waveform is transferred to drive circuit 7.In dotted line frame, be power circuit, comprise input 1, switching device 2, filter 3, output 4.Annexation: input 1 is connected to switching device 2, is transferred to filter 3 after switching device 2, then enter output 4 after installing after filtering 3 effect.
Comparison diagram 2 and Fig. 1, the corresponding relation between each device is respectively: the corresponding input 1 of input voltage E, the corresponding switching device 2 of field effect transistor S (MOSFET) and diode D, inductance L, the corresponding filter 3 of capacitor C, the corresponding output 4 of load R, reference voltage
v ref, error amplifier and comparator be corresponding
v 2control device 5, the corresponding PT control device 5 of PT control circuit, the corresponding drive circuit 7 of drive circuit.
Connection concrete in Fig. 2 is: the drain electrode of the positive pole of input voltage E and switching tube S (MOSFET) is joined, negative pole and the anode of diode D, one end (output negative pole) of one end of capacitor C and load R join; The source electrode of switching tube S (MOSFET) joins with the negative electrode of diode D and one end of inductance L, and one end (output cathode) of the other end of inductance L and one end of capacitor C and load R joins.The output of power circuit is connected with the negative terminal of the negative terminal of error amplifier and comparator, the anode of error amplifier connects reference voltage, output connects the anode of comparator, the output of comparator is connected with PT control circuit, the output of PT control circuit is connected with the input of drive unit, and the output of drive circuit is connected with the control grid of switch S (MOSFET).
Switching Power Supply of the present invention
v 2the implementation procedure of-PT modulator approach is as follows:
Step 1: switching tube S conducting, power supply E charges to inductance L, and output voltage rises.
Step 2: the error of output voltage and reference voltage compares with output voltage after amplifying.
Step 3: select corresponding pulsed power signal according to the signal of comparator output.
Step 4: corresponding pulsed power signal is delivered to control circuit and go to drive field effect transistor work, to make whole circuit form Closed control.
Fig. 3, Fig. 4 have expressed
v 2-PT is modulated at the application in Buck converter.
The concrete course of work and principle are: when output voltage is greater than error voltage, controller is selected low powder pulsed, and inductance provides energy to load, and output voltage is declined; When output voltage is less than error voltage, controller produces high power pulse, and inductance absorbs energy to power supply, gives capacitor charging simultaneously, makes output voltage increase.
Analysis of simulation result:
Fig. 3, Fig. 4 are for adopting PSIM software control method of the present invention to be carried out to the result of time-domain-simulation; The transverse axis of component in Fig. 3 (a), (b), (c) is time ms, and the longitudinal axis (a) is output voltage amplitude V, and the longitudinal axis (b) is inductive current A, and the longitudinal axis (c) is for driving signal amplitude V.In Fig. 4, the transverse axis of figure is time ms, and the longitudinal axis (a) is output voltage V, and the longitudinal axis (b) is output voltage V.Simulated conditions in Fig. 3,4:
e=15 ~ 20V,
v o=5 V,
v ref=5V,
f=20 kHz,
l=100 μ H,
c=220 μ F,
r=10 Ω,
d h=0.4,
d l=0.1,
k p =100,
k i =10ms.The mean value of the output voltage in Fig. 4 (a) is about 5.003V, and its regulation is less than 0.1%; And the mean value of output voltage is about 5.28V (b), its regulation is about 1%, has surpassed the common voltage regulation of VRM and has required 0.5%.Advantage of the present invention is: technology is fairly simple, and easily realizes.
v 2-PT control technology has transient response fast, and has improved the regulation of output voltage, compares and is more applicable in VRM module with PT control technology.
The present invention, except can be used for controlling the power inverter in above-described embodiment, also can be used for the Switching Power Supply of Boost converter, Buck-boost converter, forward converter constant power the electric circuit constitute.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention.All any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. a Switching Power Supply
v 2-PT modulator approach, when input voltage or output voltage sudden change, by adding before PT control device
v 2control device, the regulation of raising output voltage, comprises the steps:
Step 1: switching tube S conducting, power supply E charges to inductance L, and output voltage rises;
Step 2: the error of output voltage and reference voltage compares with output voltage after amplifying;
Step 3: select corresponding pulsed power signal according to the signal of comparator output;
Step 4: corresponding pulsed power signal is delivered to control circuit and go to drive field effect transistor work, to make whole circuit form Closed control.
2. Switching Power Supply according to claim 1
v 2-PT modulator approach, is characterized in that: the concrete steps of step 3 are:
When output voltage is greater than error voltage, controller is selected low powder pulsed, and inductance provides energy to load, and output voltage is declined;
When output voltage is less than error voltage, controller produces high power pulse, and inductance absorbs energy to power supply, gives capacitor charging simultaneously, makes output voltage increase.
3. a Switching Power Supply
v 2-PT modulating device, is characterized in that: comprise control circuit and power circuit, described power circuit by inputting, switching device, filter, output connect to form successively, described control circuit comprises
v 2control device, PT control device and drive unit, output,
v 2control device, PT control device, drive unit, switching device connect successively.
4. Switching Power Supply according to claim 3
v 2-PT modulating device, is characterized in that: described in be input as input voltage E, described switching device is field effect transistor S and diode D, described filter is inductance L and capacitor C, described in be output as load R, described in
v 2control device is reference voltage
v ref, error amplifier and comparator, described PT control device is PT control circuit; Annexation is: the drain electrode of the positive pole of input voltage E and switching tube S is joined, negative pole and the anode of diode D, the output negative pole end of one end of capacitor C and load R join; The negative electrode of the source electrode of switching tube S and diode D and one end of inductance L join, and the output cathode end of the other end of inductance L and one end of capacitor C and load R joins; The output of power circuit is connected with the negative terminal of the negative terminal of error amplifier and comparator, the anode of error amplifier connects reference voltage, output connects the anode of comparator, the output of comparator is connected with PT control circuit, the output of PT control circuit is connected with the input of drive unit, and the output of drive circuit is connected with the control grid of switch S.
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| CN201410394159.6A CN104158398A (en) | 2014-08-12 | 2014-08-12 | V<2>-PT modulation method of switch power supply, and V<2>-PT modulation device of switch power supply |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2744056Y (en) * | 2004-10-25 | 2005-11-30 | 西南交通大学 | Switch power controller |
| CN201167288Y (en) * | 2008-03-05 | 2008-12-17 | 许建平 | Switch power source controlled by multi-stage impulse sequence |
| US20120169308A1 (en) * | 2010-12-29 | 2012-07-05 | Microchip Technology Incorporated | Relative efficiency measurement in a pulse width modulation system |
| CN102655371A (en) * | 2012-05-02 | 2012-09-05 | 常州大学 | Double-pulse cross-cycle modulation method for switching power supply and device thereof |
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2014
- 2014-08-12 CN CN201410394159.6A patent/CN104158398A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2744056Y (en) * | 2004-10-25 | 2005-11-30 | 西南交通大学 | Switch power controller |
| CN201167288Y (en) * | 2008-03-05 | 2008-12-17 | 许建平 | Switch power source controlled by multi-stage impulse sequence |
| US20120169308A1 (en) * | 2010-12-29 | 2012-07-05 | Microchip Technology Incorporated | Relative efficiency measurement in a pulse width modulation system |
| CN102655371A (en) * | 2012-05-02 | 2012-09-05 | 常州大学 | Double-pulse cross-cycle modulation method for switching power supply and device thereof |
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Application publication date: 20141119 |