CN201466970U - Novel high-efficiency large-current booster - Google Patents
Novel high-efficiency large-current booster Download PDFInfo
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- CN201466970U CN201466970U CN2009201210590U CN200920121059U CN201466970U CN 201466970 U CN201466970 U CN 201466970U CN 2009201210590 U CN2009201210590 U CN 2009201210590U CN 200920121059 U CN200920121059 U CN 200920121059U CN 201466970 U CN201466970 U CN 201466970U
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Abstract
The utility model discloses a novel high-efficiency large-current booster, comprising a boosting branch and a digital control chip for controlling the on-off frequency of a MOS tube. The boosting branch comprises the MOS tube, an inductor, a diode and an energy storing capacitor, an input power supply is connected with one end of the inductor, the connecting node of the other end of the inductor is simultaneously connected with the drain pole of the MOS tube and the diode, and the diode is connected with the anode of the energy storing capacitor; the gate pole of the MOS tube is connected with the digital control output end of the digital control chip, and the source pole of the MOS tube is connected with the cathode of the energy storing capacitor; and the anode of the energy storing capacitor is connected with the output end of a power supply. The utility model provides thenovel high-efficiency large-current booster with small volume, low power consumption and high efficiency.
Description
Technical field
The utility model belongs to a kind of big current boost device.
Background technology
Along with popularizing of storage battery, battery-driven application is more and more.The life-span of battery and three big factors have relation, the one, the quality problem of battery itself (prescription of pole plate and welding procedure), the 2nd, scientific and reasonable using method (the charging and discharging currents size and the degree of depth), the 3rd, the combo problem, preceding two of this three big factor all solves than being easier to basically, but the most difficult still the 3rd combo problem, this is the difficult problem that any battery producer all is difficult to solution all the time.
In fact also just so, the battery that the great majority series connection is used finally all is the phenomenon that one or two fails in advance to occur, seldom there are a plurality of batteries aging simultaneously, most batteries of decline in advance are exactly because the result that series connection is used, because the battery series connection uses the rapid variation of consistency that the later stage can make battery, it is mainly reflected in individual cell because of over-discharge can (this is unavoidable forever) sulfation in the middle of series circuit, and individual cell when charging because of regular overcharging (this also is unavoidable forever in the middle of series circuit) dehydration until filling drum.
So, series circuit can cause because of the consistency problem of battery the part battery because of overdischarge, overcharge, owe charging and damage in advance, change series connection into consistency problem that parallel connection can be ignored battery fully, afterwards terminal voltage is all the same because of its parallel connection, the phenomenon of overdischarge can never occur, overcharge, owing to charge can average out automatically according to the internal resistance of each battery during work.But voltage ratio series connection in rear end in parallel is low, so also will boost and could use with stepup transformer in application.
At above problem, the domestic similarly stepup transformer of also once developing.Volume of transformer is excessive, shortcomings such as efficient is low excessively, poor reliability do not solve root problem but adopt, and can not get extensive use.The utility model high efficient and reliable, volume are small and exquisite, have realized this function fully.
Summary of the invention
The deficiency that existing stepup transformer volume is big, no-load power consumption is too high, efficient is low in order to overcome, useful life is short, the utility model provides the high-efficiency big-current voltage booster that a kind of volume is small and exquisite, low in energy consumption, efficient is high, increase the service life.
The technical scheme that its technical problem that solves the utility model adopts is:
A kind of high-efficiency big-current voltage booster, comprise the input power supply, described stepup transformer also comprises the branch road and in order to the digital control chip of break-make frequency of control metal-oxide-semiconductor of boosting, the described branch road that boosts comprises metal-oxide-semiconductor, inductance, diode and storage capacitor, the input power supply connects an end of described inductance, the connected node of the described inductance other end is connected with diode with the drain electrode of metal-oxide-semiconductor simultaneously, and described diode is connected with the positive pole of described storage capacitor; The gate pole of described metal-oxide-semiconductor is connected with the digital control output of described digital control chip, and the source electrode of described metal-oxide-semiconductor is connected with the negative pole of described storage capacitor by a sample resistance; The positive pole of described storage capacitor is connected with power output end.
As outstanding a kind of scheme: the connected node ground connection of described sample resistance and described storage capacitor.
Further, described digital control output is the PWM control end.
The source electrode of described metal-oxide-semiconductor also is connected with the voltage feedback signal end of described digital control chip by additional resistance.The resistance of sampling resistor is less, and described voltage feedback signal end is in order to detect the voltage that bears on the sample resistance.
Described storage capacitor is in parallel with idle capacity.
Further again, the digital control output of described digital control chip has two, and two digital control output ends are connected with the gate pole of the metal-oxide-semiconductor of the branch road that boosts respectively.
Technical conceive of the present utility model is: efficient heavy DC booster circuit is referred in the storage battery power supply system, boost with respect to transformer of the prior art, has the advantage that volume is little, power consumption is little, efficient is high, storage battery parallel power supply can increase the service life greatly, has good practicality.
The boost converter perhaps is Step-up converter, is a kind of switch DC booster circuit, and it can be that output voltage is than input voltage height.Basic circuit diagram is seen Fig. 1.
Suppose that switch (triode or metal-oxide-semiconductor) has disconnected for a long time, all elements all are in perfect condition, and capacitance voltage equals input voltage.To divide the charging and two parts of discharging that this circuit is described below.
Charging process: in charging process, switch closure (triode or metal-oxide-semiconductor conducting), equivalent electric circuit such as Fig. 2, switch (triode or metal-oxide-semiconductor) is located to replace with lead.At this moment, input voltage flows through inductance.Diode prevents that electric capacity from discharging over the ground.Because input is a direct current, so the electric current on the inductance increases so that certain ratio is linear, this ratio is relevant with the inductance size.Along with inductive current increases, some energy have been stored in the inductance.
Discharge process: as Fig. 3, this is the equivalent electric circuit when switch disconnects (triode or metal-oxide-semiconductor end).When switch disconnected (triode or metal-oxide-semiconductor by), because the electric current retention performance of inductance, the electric current of the inductance of flowing through can not become 0 at once, but the value when being finished by charging slowly becomes 0.And original circuit has disconnected, so inductance can only discharge by novel circuit, promptly inductance begins to the electric capacity charging, and the electric capacity both end voltage raises, and this moment, voltage was higher than input voltage, and boosting finishes.
As Fig. 4, the sawtooth waveforms that inductive current (Inductor current) forms at charge and discharge process, the process of boosting is exactly the energy transfer process of an inductance in fact.During charging, inductance absorbs energy, and inductance is emitted energy during discharge.If capacitance is enough big, just can in discharge process, keep a lasting electric current at output so.If the process of this break-make constantly repeats, just can obtain being higher than the voltage of input voltage at the electric capacity two ends.
The beneficial effects of the utility model mainly show: 1, volume is small and exquisite, power consumption is little, efficient is high, increase the service life; 2, practicality is good.
Description of drawings
Fig. 1 is the citation form schematic diagram of BOOST circuit;
Fig. 2 is the charging process equivalent circuit diagram;
Fig. 3 is the discharge process equivalent circuit diagram;
Fig. 4 is the current waveform schematic diagram on the inductance;
Fig. 5 is the circuit diagram of high-efficiency big-current voltage booster of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
With reference to Fig. 5, a kind of high-efficiency big-current voltage booster, comprise the input power supply, described stepup transformer also comprises the branch road and in order to the digital control chip of break-make frequency of control metal-oxide-semiconductor of boosting, the described branch road that boosts comprises metal-oxide-semiconductor, inductance, diode and storage capacitor, the input power supply connects an end of described inductance, and the connected node of the described inductance other end is connected with diode with the drain electrode of metal-oxide-semiconductor simultaneously, and described diode is connected with the positive pole of described storage capacitor; The gate pole of described metal-oxide-semiconductor is connected with the digital control output of described digital control chip, and the source electrode of described metal-oxide-semiconductor is connected with the negative pole of described storage capacitor; The positive pole of described storage capacitor is connected with power output end.
The connected node ground connection of described sample resistance and described storage capacitor.Described digital control output is the PWM control end.The source electrode of described metal-oxide-semiconductor also is connected with the voltage feedback signal end of described digital control chip by additional resistance.Described storage capacitor is in parallel with idle capacity.
The digital control output of described digital control chip has two, and two digital control output ends are connected with the gate pole of the metal-oxide-semiconductor of the branch road that boosts respectively.
In like manner, described voltage feedback signal end also has two, and the additional resistance with the branch road that boosts is connected respectively.
First branch road that boosts comprises the first metal-oxide-semiconductor Q1, first inductance L 1, the first diode D1, the first storage capacitor C13, the first idle capacity C23, first resistance R 16 and second resistance R 12; Second branch road that boosts comprises the second metal-oxide-semiconductor Q2, second inductance L 2, the second diode D2 and the second storage capacitor C14, the second idle capacity C34, the 3rd resistance R 17 and the 4th resistance R 13;
24 pins and 13 pins of digital control chip are the PWM control end.23 pins and 14 pins of digital control chip are the SENSE pin, are the voltage feedback signal end, and electric positive R12 is connected with pin 23, resistance R 13 is connected with pin 14 is in order to gather voltage signal, and increases reliability.
The course of work of this example is:
(1), determine input, output voltage, output current: the utility model can operate as normal under the input voltage of DC4V-DC36V.The condition of work of considering practical application is: input 12V, output 48V/10A.Can operate as normal for considering under the input voltage of 10.5-13.5V, so be limited to 10V under the input voltage during design.
(2), the setting of operating frequency: operating frequency of the present utility model can be worked in the 75KHZ-500KHZ scope, and different operating frequencies is by the outer meeting resistance decision of chip respective pins, in order to reduce the difficulty of PCB layout, so frequency is selected for use about 300K.
Require to calculate the main devices parameter according to reality: the Boost booster circuit can be operated in discontinuous current mode of operation (DCM) and electric current continuous operation mode (CCM).The CCM mode of operation is fit to high-power output circuit, considers that load reaches 10% when above, and inductive current need keep continuous state, therefore, carries out specificity analysis by the CCM mode of operation.
By BOOST booster circuit basic waveform as can be known: during ton, switching tube S is a conducting state, and diode D is in cut-off state, and the electric current of the inductance L of flowing through and switching tube increases gradually.
The inductance value of L1 and L2 is: 2.7uH; The sample resistance of digital control chip is: 1.87m Ω; The capacitance of the first storage capacitor C13, the second storage capacitor C14, the first idle capacity C23 and the second idle capacity C34: 10uF; The resistance of resistance R 16 and R17: 2m Ω; The resistance of resistance R 12 and R13: 10 Ω.
The low-tension supply VIN of present embodiment (input) voltage is 5～36v, and by the duty cycle adjustment of digital control chip, its output voltage VO UT is 48V.
Claims (6)
1. new and effective big current boost device, it is characterized in that: described stepup transformer comprises the branch road and in order to the digital control chip of break-make frequency of control metal-oxide-semiconductor of boosting, the described branch road that boosts comprises metal-oxide-semiconductor, inductance, diode and storage capacitor, the input power supply connects an end of described inductance, the connected node of the described inductance other end is connected with diode with the drain electrode of metal-oxide-semiconductor simultaneously, and described diode is connected with the positive pole of described storage capacitor; The gate pole of described metal-oxide-semiconductor is connected with the digital control output of described digital control chip, and the source electrode of described metal-oxide-semiconductor is connected with the negative pole of described storage capacitor by a sample resistance; The positive pole of described storage capacitor is connected with power output end.
2. new and effective big current boost device as claimed in claim 1 is characterized in that: the connected node ground connection of described sample resistance and described storage capacitor.
3. new and effective big current boost device as claimed in claim 1 or 2, it is characterized in that: described digital control output is the PWM control end.
4. new and effective big current boost device as claimed in claim 3 is characterized in that: the source electrode of described metal-oxide-semiconductor also is connected with the voltage feedback signal end of described digital control chip by additional resistance.
5. new and effective big current boost device as claimed in claim 3, it is characterized in that: described storage capacitor is in parallel with idle capacity.
6. new and effective big current boost device as claimed in claim 1 or 2, it is characterized in that: the digital control output of described digital control chip has two, and two digital control output ends are connected with the gate pole of the metal-oxide-semiconductor of the branch road that boosts respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201210590U CN201466970U (en) | 2009-05-27 | 2009-05-27 | Novel high-efficiency large-current booster |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009201210590U CN201466970U (en) | 2009-05-27 | 2009-05-27 | Novel high-efficiency large-current booster |
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| CN201466970U true CN201466970U (en) | 2010-05-12 |
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| CN2009201210590U Expired - Fee Related CN201466970U (en) | 2009-05-27 | 2009-05-27 | Novel high-efficiency large-current booster |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116955A (en) * | 2015-10-09 | 2015-12-02 | 东南大学 | Transient enhancement circuit applied to full-integration LDO |
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2009
- 2009-05-27 CN CN2009201210590U patent/CN201466970U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116955A (en) * | 2015-10-09 | 2015-12-02 | 东南大学 | Transient enhancement circuit applied to full-integration LDO |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100512 Termination date: 20110527 |