CN206077227U - A kind of improved B uck changer controlled based on PT - Google Patents
A kind of improved B uck changer controlled based on PT Download PDFInfo
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- CN206077227U CN206077227U CN201621095680.0U CN201621095680U CN206077227U CN 206077227 U CN206077227 U CN 206077227U CN 201621095680 U CN201621095680 U CN 201621095680U CN 206077227 U CN206077227 U CN 206077227U
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- inductance
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- electric capacity
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Abstract
This utility model is related to a kind of improved B uck changer controlled based on PT, and the changer is developed by traditional Buck transformation topologies and formed, and increases by one and be parallel to output filter capacitor C two ends by inductance L on traditional Buck transformation topologies2, electric capacity C0And diode D2The branch road of composition, wherein inductance L2One end and inductance L1One end be connected the other end and diode D2Negative electrode be connected；Diode anode is connected with " " end of power supply E；Electric capacity C0Two ends respectively with diode D1With D2Negative electrode be connected；The Buck transformer configurations of modified model PT controls are simple, and conversion efficiency is high, increase branch road components and parts small power consumption, while solving the problems, such as traditional PT controls Buck changer output voltage low-frequency fluctuations, greatly improve the stability of system.
Description
Technical field
The invention belongs to DC-to-dc (DC-DC) convertor controls technical field category, more particularly to it is a kind of based on pulse
The input voltage of sequence control is higher than output voltage voltage-dropping type DC-DC converter.
Background technology
The development of computer and communication technology and the popularization of personal portable, it is more next to the performance requirement of Switching Power Supply
Higher, there is poor transient response, poor robustness and COMPENSATION NETWORK DESIGN difficulty etc. in the PWM technologies based on linear control theory
Problem, therefore the performance that people always strive to using more preferable control technology improve Switching Power Supply.In order to solve the above problems,
IWatt companies develop the voltage stabilizing technique that a kind of entitled pulse train (Pulse Train, PT) is controlled, and are widely used in electricity
During battery-powered computer, consumer product etc. need the electronic system of multiple feed.For example in the Buck circuits of PT controls,
Control loop does not need error amplifier and its compensates network accordingly, has very fast response speed to loading change.But PT is controlled
There is output voltage low-frequency fluctuation in the Buck circuits of system, the energy of two groups of output pulses transmission has larger difference,
Cause the ripple of output voltage larger.The larger shortcoming of output voltage ripple existing for it limits its industrially extensive
Using have impact on the development of PT controlling switch changers.For this problem, the utility model proposes a kind of modified model PT controls
Buck changers, can realize suppressing output voltage low-frequency fluctuation problem.
The content of the invention
This utility model relates generally to voltage-dropping type transformation topology, and a kind of modified model PT controls Buck changers of proposition can
Output voltage low-frequency fluctuation is solved the problems, such as effectively.The modified model PT controls Buck changers have studied circuit and be operated in electricity
Inducing current continuous mode (continuous conduction mode, CCM) situation, transformation topology are as shown in Figure 1.Q is switch
Pipe, L is filter inductance, and C is filter capacitor, and D is fly-wheel diode, and PT control circuits provide high-low power pulse for switching tube Q.
In order to solve the problems, such as output voltage low-frequency fluctuation, the utility model proposes technical scheme below：
Branch road and control that the modified model PT controls Buck circuits are made up of traditional Buck circuits, inductance capacitance diode
Circuit composition processed, the Buck circuits are connected with the drain electrode of metal-oxide-semiconductor Q by the "+" end of DC source E；The source electrode of metal-oxide-semiconductor Q and two
Pole pipe D1Negative electrode and inductance L1One end be connected；Inductance L1The other end and output filter capacitor C positive pole and load R
One end be connected；The "-" end of DC source E and diode D1Anode, the negative pole of output filter capacitor C and load R it is another
One end is connected；The control circuit, is sequentially connected by voltage sampling circuit, error compensation circuit, triggers circuit and drive circuit
Composition.Characterized in that, the two ends parallel connection of output filter capacitor C is by inductance L2, electric capacity C0And diode D2The branch road of composition,
Wherein inductance L2One end and inductance L1One end be connected, the other end and diode D2Negative electrode be connected, diode anode and power supply
The "-" end of E is connected, electric capacity C0Two ends respectively with diode D1With D2Negative electrode be connected.The modified model PT control Buck conversion of composition
Topology, as shown in Figure 2.
The utility model has the advantage of：
A) can effectively solve the problem that PT controls the output voltage low-frequency fluctuation problem in Buck circuits；
B) circuit transmission energy to load during, remaining energy can be stored in increase branch road inductance capacitance
In, it is to avoid circuit components are impacted because the variable quantity of voltage in circuit is excessive；
Description of the drawings
Fig. 1 is that tradition PT controls Buck circuit theory diagrams.
Fig. 2 is that modified model PT controls Buck circuit theory diagrams.
Fig. 3 (a), (b) are the main oscillogram of PISM software emulations tradition PT control Buck circuits.
Fig. 4 is the main oscillogram of PISM software emulation modified models PT control Buck circuits.
Fig. 5 is that tradition PT control Buck circuit hardwares test main oscillogram.
Fig. 6 is that modified model PT control Buck circuit hardwares test main oscillogram.
Fig. 1 description of symbols：E is DC source, and Q is metal-oxide-semiconductor, D1For fly-wheel diode, L1For inductance, C is output filtered electrical
Hold, R is load.
Fig. 2 description of symbols:L1For increased shunt inductance, C0For increased branch road electric capacity, D2For increased by two pole of branch road
Pipe.
Fig. 3 description of symbols:vGAnd v0Respectively tradition PT controls Buck changer breaker in middle tube voltages and output voltage.
Fig. 4 description of symbols:vGAnd v0Respectively modified model PT controls Buck changer breaker in middle tube voltages and output voltage.
Fig. 5 description of symbols:vGAnd v0Respectively tradition PT controls Buck changer breaker in middle tube voltages and output voltage.
Fig. 6 description of symbols:vGAnd v0Respectively modified model PT controls Buck changer breaker in middle tube voltages and output voltage.
Specific embodiment
This utility model is a kind of modified model PT controls Buck changers.The concrete connected mode of main circuit is, unidirectional current
The "+" end of source E is connected with the drain electrode of metal-oxide-semiconductor Q；The negative electrode of the source electrode and diode D1 of metal-oxide-semiconductor Q, one end of inductance L1 and
One end of road electric capacity C0 is connected；One end of the other end and shunt inductance L2 of inductance L1, the positive pole of output filter capacitor C and negative
The one end for carrying R is connected；The "-" end of DC source E and the anode of diode D1, the negative pole of output filter capacitor C, diode D2
The other end of anode and load R is connected；The C0 other ends of branch road electric capacity and one end of shunt inductance L2 and diode D2's
Negative electrode is connected；The control circuit, is sequentially connected by voltage sampling circuit, error compensation circuit, triggers circuit and drive circuit
Composition.
Concrete analysis is as follows：If output voltage is less than reference voltage, PT controllers select high power pulse, inductive current
Rise, but now output voltage may rise be likely to decline；Similar, in switch periods start time, if output voltage
Higher than reference voltage, PT controllers will select low powder pulsed, and inductive current declines, but now output voltage may decline and also may be used
Can rise, cause output voltage low-frequency fluctuation phenomenon occur.This utility model is by parallel one at output filter capacitor C two ends
By inductance L2, electric capacity C0And diode D2The branch road of composition, can efficiently solve output voltage low-frequency fluctuation problem.When defeated
When going out voltage more than reference voltage, PT controllers will select low powder pulsed, and circuit is in order to transmit less energy, inductance L1In
Part energy be stored into increase branch road inductance L2And C0In, so that output voltage is rapid towards reference voltage direction
Decline；When output voltage is less than reference voltage, PT controllers will select high power pulse, the presence due to increasing branch road, electricity
More multi-energy is transmitted in same time in road so that output voltage is raised towards reference voltage direction rapidly, so as to effectively solve
The certainly low-frequency fluctuation problem of output voltage.This utility model is verified with experiment embodiment by emulation, is emulated and experiment parameter
Such as table 1：
1 modified model PT of table controls BUCK circuit simulations and experiment parameter
| Element | Parameter |
| Main circuit inductance L1 | 500uH |
| Filter capacitor C | 470uF |
| Shunt inductance L2 | 100uH |
| Branch road electric capacity C0 | 20uF |
| Input voltage E | 20V |
| Reference voltage Vref | 10V |
| High power pulse DH | 0.6 |
| Low powder pulsed DL | 0.4 |
| Switching frequency f | 20kHz |
| Load impedance R | 5Ω |
Fig. 3 (a) is PISM software emulations tradition PT control Buck changer output voltage voWith driving pulse vGOscillogram,
Fig. 3 (b) is corresponding output voltage voWith driving pulse vGLocal oscillogram during stable state.Fig. 4 is PISM software emulation modified model PT
Control Buck changer output voltage voWith driving pulse vGOscillogram.It can be seen that output voltage amplitude is reduced to original
26.4% for coming, the number of drive pulses in a cycle is significantly reduced；Fig. 5 is experimental circuit PT control Buck changer output electricity
Pressure voWith driving pulse vGOscillogram.Fig. 6 is experimental circuit modified model PT control Buck changer output voltage voWith driving pulse
vGOscillogram.It can be seen that output voltage amplitude is reduced to original 25.0%, the number of drive pulses in a cycle
Significantly reduce, basically identical with emulating, output voltage low-frequency fluctuation phenomenon is effectively suppressed.
Claims (2)
1. a kind of Buck changers of modified model PT controls, are by traditional Buck circuits, inductance L2Electric capacity C0With diode D2Constitute
Branch road and control circuit composition, the Buck circuits are operated under inductor current continuous mode, the "+" end of DC source E
Drain electrode with metal-oxide-semiconductor Q is connected；The source electrode and diode D of metal-oxide-semiconductor Q1Negative electrode and inductance L1One end be connected；Inductance L1It is another
One end is connected with one end of the positive pole and load R of output filter capacitor C；The "-" end of DC source E and diode D1Sun
The other end of pole, the negative pole of output filter capacitor C and load R is connected；The control circuit, by voltage sampling circuit, error
Compensation circuit, triggers circuit and drive circuit are sequentially connected composition；Characterized in that, the two ends of output filter capacitor C it is in parallel by
Inductance L2, electric capacity C0And diode D2The branch road of composition, wherein inductance L2One end and inductance L1One end be connected, the other end with
Diode D2Negative electrode be connected, diode anode is connected with the "-" end of power supply E, electric capacity C0Two ends respectively with diode D1With D2's
Negative electrode is connected.
2. the Buck changers that modified model PT according to claim 1 is controlled, described branch road electric capacity C0For ceramic electrical perhaps
Thin-film capacitor, shunt inductance L2For magnetic core coil inductance, bypass diodes D2For fast recovery diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621095680.0U CN206077227U (en) | 2016-09-30 | 2016-09-30 | A kind of improved B uck changer controlled based on PT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621095680.0U CN206077227U (en) | 2016-09-30 | 2016-09-30 | A kind of improved B uck changer controlled based on PT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206077227U true CN206077227U (en) | 2017-04-05 |
Family
ID=58439856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621095680.0U Expired - Fee Related CN206077227U (en) | 2016-09-30 | 2016-09-30 | A kind of improved B uck changer controlled based on PT |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206077227U (en) |
-
2016
- 2016-09-30 CN CN201621095680.0U patent/CN206077227U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170405 Termination date: 20170930 |
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| CF01 | Termination of patent right due to non-payment of annual fee |