CN103312149A - Direct current power supply with constant power output characteristic - Google Patents
Direct current power supply with constant power output characteristic Download PDFInfo
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Abstract
The invention discloses a novel switch type direct current power supply which outputs direct current power instead of stable voltage or current. The design principle of the invention is that a pulse width (Ton) is fixedly arranged in a PWM (Pulse Width Modulation) (pulse width control type) pulse excitation signal, and an inter-pulse (Toff) is fixed in an FWM (Four-wave Mixing) (inter-pulse control type) pulse excitation signal under the precondition that Pfc (Power factor compensation correction) boosts and stabilizes the voltage; and during work period of the constant power direct current power supply, no control adjustment is carried out on pulse width or inter-pulse and a signal source is turned off in a limit protection (over voltage, over current and over power) mode instead, thus ensuring the consistency of an output constant power value.
Description
Affiliated technical field
The present invention relates to the novel switched type DC power supply of a class, what its was exported is stable direct current power, and non-stable voltage or electric current.
General DC power supply in the market is divided into voltage stabilizing (constant voltage) power supply and current stabilization (constant current) power supply basically, the special DC field of power supplies also is this two classes power supply basically, and only having a small amount of is with the controllable silicon technology or with the constant-power direct-current power supply of computer simulation control technology.
Before half a century, the upsurge that also once had a burst of constant power output to regulate or control, its leading role is the controllable silicon of now gradually having been faded from memory by the people, and silicon controlled power adjustments mode the control mode with modern Switching Power Supply is similar unexpectedly, early stage " angle of flow " control method and PWM (pulse width control method) be equally control single current intensity finish.(the cycle control method) in later stage and FWM (control method between arteries and veins) achieve the goal by the current density of control t in the time period.This is their so-called similar parts.But practical function does not have comparativity.
Have a talk again the constant-power power source that some is made of switch power technology.This is that the key control technology in the converter power supply is plucked out in fact, only is used for some products of charge power supply.All adopt the computer simulation emulation control technology, its output characteristic curve of the product of making, non-of the present invention be a smooth straight squint line segment, but similar to this line segment certain fluctuating range arranged, the ripple line segment that the certain hour interval is arranged, the height of its fluctuation is exactly the amplitude of departure, and the interval time of amplitude is exactly the sampling correcting time of control chip.Therefore though this type of power supply is made style with the present invention and is approached, and can not carry out analogy.Moreover this type of power supply is only applicable to the larger capacitive load of tolerance because of above-mentioned said reason, and to the larger inductive load of current transients especially, this type of power supply is fully inapplicable.And power supply of the present invention does not have such situation.
Summary of the invention
Set forth for convenient, with general in the market DC power supply, the reduction of fractions to a common denominator is constant voltage source and constant-current supply two large classes.The present invention is that the 3rd class power supply is referred to as constant-power power source.
Analyze first front two class power supplys.Constant voltage source claims again stabilized voltage power supply, it is characterized in that controlling voltage fluctuation electric current is not done any control, and only when reaching the current limit value that power supply can provide, electric current enters guard mode, turn-offs output.
Constant-current supply; It is characterized in that controlling current fluctuation, voltage is not done any control, just when it reached the voltage pole limit value that power supply can provide, power supply entered guard mode, turns off output.
The technical characterictic of the constant-power power source that I design is the limiting value of a setting voltage and current protection, does not do any control.When unloaded, the voltage of power supply output is limiting value, connects load R, and when the electric current of flowing through multiplied each other less than the limiting voltage value with it, what power supply presented was the output characteristic of constant voltage source.When load R continues to reduce, the electric current of flowing through continues to increase, and when both products equaled supply voltage value, we were referred to as permanent power starting point with this point.Along with load resistance continues to reduce, voltage decreases, and electric current continues to increase, and sets up an office to 90～95% places of maximum limit flow valuve, is referred to as permanent power cut-off point.Toward the current limit value that is issued to setting, power supply enters guard mode again, and in this change procedure, the product of electric current and voltage is a steady state value, so we are referred to as constant-power power source.
We analyze the output characteristic of these three kinds of power supplys now; We know the expression formula of the internal resistance of source
Δ R internal resistance=Δ V/ Δ I formula (1)
Δ V is the variable of supply voltage, and Δ I is the variable of electric current.
The output characteristic of constant voltage source is described below, and behind output voltage values of power settings, no matter how load changes, voltage is without any fluctuation, and only after electric current surpassed the setting limit (Ah) value, power supply entered guard mode, reduced until turn-off output.(diagram 1)
We infer that the type internal resistance of source is infinitely small according to formula (1).
The constant-current type output characteristic of power source is described below: no matter how load changes behind output current value of power settings; electric current is without any change; voltage is but along with the variation of load is fluctuateed up and down; power supply enters guard mode after magnitude of voltage exceeds the setting limit (Vh) value, reduces until turn-off output.(diagram 2)
Infer that according to formula (1) the type internal resistance of source is infinitely great.
The design's constant power output characteristic is described below: wherein A is the ceiling voltage set point, and B is the maximum current set point, and C is the flex point (starting point) that electric current enters permanent power rating, and the D point is the set point (cut-off point) of maximum current and minimum voltage.(diagram 3)
Oblique line between C and the D is the constant power output characteristic curve, be expressed as follows V ↓ * I ↑=P
ConstantThe product that namely changes in the opposite direction is identical.We can infer that its internal resistance is variable according to output characteristic curve figure and formula (1), and change along with the variation of electric current.Draw thus R
i(internal resistance and load sum) and voltage quantities (V
i) and electric current variable (I
i) corresponding change curve.(diagram 4. diagrams 5)
And the magical part of constant-power power source just is that the mystery of this internal resistance changes.
The below sets forth the design principle of this constant-power power source.
According to P=V * I=V
2/ R formula (2)
The empirical equation of inferring out this permanent power is
P
Constant=P
i=V
i* I
i=V
i 2/ R
i
Wherein P is constant is a firm power, V
iWith I
iFinger is the electric current and voltage variable on this constant power output curve, R
iThe variable of expression (internal resistance and load resistance sum).(diagram 3.4.5)
This formula with the correlation of firm power source and other ternaries express very clear.
We know, burning voltage and stable electric current multiply each other and are permanent power, the design designs based on this principle, modern Switching Power Supply design reaches its maturity, and PFC (power factor correction) rises voltage stabilizing technique and also has been widely used on the Switching Power Supply front end circuit, and this is the design's the most important condition.Constant voltage source has been arranged, set again constant electric current and multiply each other with it, just consisted of initial constant power source.With regard to switch power technology, mainly be these two kinds of control methods of PWM (pulse width control) and FWM (controlling between arteries and veins) at present.PWM is by adjusting the intensity of pulse duration (ton) control electric current; FWM controls the density of electric current by the spacing (toff) of adjusting pulse, this is the difference of the two.In actual applications, without too many difference.When our fixed pulse width in pwm signal, fixedly between arteries and veins, (fixedly Ton-Toff) just can obtain a constant current in the FWM signal, and this is Switching Power Supply designer's a general knowledge.Under the condition of this constant current in constant voltage, through the transformer transducing, the processing such as rectification, filtering, just can obtain a constant direct current power source at power output end, this permanent power must deduct transition loss certainly, when this loss is definite value or linear value, the output characteristic linearity of constant power source is better, when this loss presents under current state when non-linear, larger distortion and error can appear, and this is that the repeatedly experiences of the design person when practical application drawn lessons and experience.In fact all Switching Power Supply designers face under the super-high-current loss utmost point and increase severely and add the situation of efficient step-down.Now existing considerable from hardware and device find the method that addresses these problems, these methods are public technology, if carry out the prime compensation in conjunction with singlechip technology, then can effectively improve even eliminate this problem.
Another technical characterictic of the present invention is: the output power value of constant-power direct-current power supply is only set potentiometer Wp and is controlled, and does not accept control adjustment or the change of other signals.The method that adopts is only to do limit protection (overvoltage, overcurrent, overpower), and the limit signal that records is used for cut-off signals source but not change, so just can guarantee the consistency of output constant power value.
Technical characterstic of the present invention is: environmental protection, energy-conservation, efficient, it is lower that its product has higher stability and reliability and cost of manufacture.
Description of drawings
Figure of description Fig. 1 is two kinds of general DC power supply output characteristic curve figure and constant-power direct-current output characteristic of power source curve chart and load on the market, voltage, and electric current ternary correlation figure:
Fig. 1-a is constant voltage source output characteristic curve figure;
Fig. 1-b is constant-current supply output characteristic curve figure;
Fig. 1-c is constant-power power source output characteristic curve figure, equation expression: P is constant=and Vi * Ii;
Fig. 1-d is load variation curve chart corresponding to voltage quantities, equation expression: P is constant=and Vi
2÷ Ri
Fig. 1-e is load variation and the corresponding curve chart of electric current variable, equation expression: P is constant=and Ii
2* Ri
Wherein: the constant Constant Direct Current power for power supply output of P, Ri is load variation, and Vi is voltage quantities, and Ii is the electric current variable.
Fig. 2 is 120W constant-power direct-current power sourced electric schematic diagram;
Fig. 3 is the permanent power charger of 500W electrical schematic diagram;
Fig. 4 is the permanent power high frequency pulse power of 500W electrical schematic diagram.
Illustrating 6 design principles is described as follows:
1.. adopt the switching power source chip TL494 of pwm pattern as permanent power signal source, (the higher pulsewidth of voltage is narrower to utilize the 4th pin of this integrated circuit and the corresponding relation of 5V voltage, otherwise wider) setting signal, by R1, Wp, ratio relation between the R4 is set the magnitude of voltage of 4 pin, thereby determines the pulsewidth of pulse excitation signal.R1 determines minimum pulse width, and R4 determines maximum pulse width, and Wp determines the scope that constant power output is adjusted.
2.. change process control (pulse-width adjustment) into output control (limit shutoff); Lj side bridge C9C10R14R15R18R19D12Wc consists of overpower protection by 339-A switch transformer primary current magnetic test coil; the Wc potentiometer is set primary current protection value, and R13 and LED (redness) show for overpower protection.339-BD11R16R20R21R55R56R57Wv consists of voltage limit protection, Wv potentiometer setting voltage limiting value.339-CD10R22R23R24R25R26Wa and joint inspection leakage resistance Rj consist of the current limitation protection, and Wa potentiometer setting electric current output stage limit value reduces or Rj in parallel also can increase output current value.Through the 3rd pin of diode R17 input TL494, cut-off signals was exported after three comparators amplified 100 times with the limit signal that records.R27D9C12C13 consists of comparator reference, and the D9 cathode voltage is about 0.55V.
3. the effect of .Q3Q4 is to accelerate the switch-off power metal-oxide-semiconductor, switch transformer adopts the EM40 magnetic core framework, former being designed to (just first) 2 folders 1, make 3 folders 2 (inferior first first) into because providing enough electric currents afterwards, elementary by φ 0.72 wire diameter enamelled wire Double-wire parallel wound, secondary by φ 0.96 wire diameter enamelled wire Double-wire parallel wound, have on the number of turns and the phase place drawing.Three secondary coils are respectively through independently being parallel to energy storage filter coil L9 input behind the high-frequency rectification separately, and after transforming this time, power supply is the electric current of stable output 50A easily.
Figure of description 2 diagrams 7 are the permanent power charger of 500W electrical schematic diagram
Illustrating 7 design principles is described as follows:
1. preposition market 500WPfc on sale rises the voltage regulation unit module, make " permanent power " this theory more perfect, even if in the larger occasion of voltage fluctuation, the power of power supply output does not have any variation, and the power factor of power supply is greatly improved.
2. because dynamic lithium battery is to be worth than high product, therefore lithium battery group (50A60V) market price of bid requires very high to charger more than 7500 yuan.Especially over-charge of lithium battery tolerance extreme difference slightly overcharges deflagration accident having will occur.The charging safe voltage value of each battery is 4.25V in theory, and the charging safe voltage value after the series connection of 14 batteries is 59.5V, and because considering the otherness of individual battery, the tenderer sets stops filling a little is 59V.Designed the 59V sampling amplification circuit that 339-DR28R29R30R31R32 consists of for this reason, exterior feature value discriminator (preventing false triggering) the input Q6 pipe base stage that output signal is in series via R12D20D21, Q6Q7 is simulation controllable silicon structure, Q5 is that voltage commutation keeps, FM is buzzer, reports to the police as turn-offing.
Figure of description 3 diagrams 8 are the permanent power high frequency pulse power of 500W electrical schematic diagram
Illustrating 8 design principles is described as follows:
1.. signal element consists of the FWM control system by 555 integrated circuits and optocoupler G1, just
(Ton) is set as 5 microseconds to pulsewidth, and pulse distance (Toff) is set as 6-60 microsecond (having Wp to regulate sets),
2. .Q5 is the shutoff gate of signal element, amplify via R17 via comparator when limit signal and inject the Q5 base stage, and the Q5 conducting, 555 integrated circuits, 4 pin (resetting) zero setting, signal turn-offs.
3. .Q6R2D23 consists of simple and easy source of stable pressure, and the On current of 0.2-10 milliampere is provided for the elementary luminous tube of optocoupler G1.
4.. constant-power power source has preferably electric current and voltage compatibility and followability, follows the tracks of under the good prerequisite at gap voltage, and permanent power regulating knob Wp is the processing electric current adjusting knob.
5.. by aforesaid reason, the current-limiting resistance cancel all of pulse power pipe, drain electrode all is connected in high frequency pulse power supply output negative terminal.
6.. and the D3 at the output two ends is the Schottky diode of 100V5A.
Embodiment is given an example:
Example 1:(diagram 6) (sees Figure of description 1 diagram 6 for details)
The second half year first in 1996, the inventor was by the business of relationship to the primary power source design improvement.Through briefing and site observation, recognize that this is the Power supply alteration business of a medium-sized power DC motor dynamics testing equipment.This direct current machine is that this factory develops the product of finishing recently, nominal power 300W, the content of dynamic test is to load until stall continuously behind the No Load Start, moment of torsion indication (unit Newton/meter) is arranged on the equipment of its loading when how much numerical value moment of torsion reaches, relevant current of electric just has corresponding gauge outfit and shows, from no-load current (moment of torsion is 0) to loading until stall, its torque value and corresponding current are all in the scope of setting, it is qualified to be judged to, otherwise is defective.Observe again its floating voltage electric current be 100V---0 6----0 8A, loading after-current increases gradually, the armature both end voltage drops gradually, electric current reaches 35A---40A during to stall, both end voltage is fallen only 3---4V.Through examining and calculating, an idea has been arranged in the heart, because of instantaneous the increasing to about 1,2A of electric current after loading, and the electric current when arriving stall is 35A, terminal voltage is 3,5V.Through calculate loading initial voltage 100V, electric current 1,2A, aggregate power is 120V, electric current 35A during stall, voltage 3,5v product are 122,5W, and be substantially equal.Former power-supply system is one 3 kilowatts 3 phase Industrial Frequency Transformers, secondary for exchanging the 75V40A winding, be that 1,8 ohm of parallel resistance group is (because this group resistance upgrades through multiple high temp and after burning by one group of resistance behind the bridge rectifier that forms through heavy-duty diode, changed beyond recognition, only through maintenance personal's explanation and the tentative for this reason value of bridge measurement) as testing power supply.Pass through nearly one month repeatedly design and fabrication, produced First 120W constant-power power source, adopt the PWM pattern, chip is TL494, utilizes the wherein specific function of a pin, reaches the order that pulsewidth is set., the 4th pin of this integrated package is relevant with 5V voltage, and the higher pulsewidth of voltage is narrower, otherwise then wider.All the other are exactly the popular design of common double tube positive exciting formula Switching Power Supply.Directly talk in whispers at heart after just having completed, a 120w power supply replaces the 3000w power supply, whether might property? connect unusual good of an examination effect behind the machine, stable, the advantages such as low and power saving that heat up allow the user feel good, but it is a kind of perturbed that design side always has at heart, one 3 kilowatts power supply, only the Switching Power Supply with 120W has just replaced, can be so not smooth.Truly after several days, message feedback is come, and considerable problem occurred; 1, test inaccurate, considerable substandard product, this test in finished into qualified product, 2, enter large Current Zone test error very big, 3, cold conditions and hot test data are inconsistent, 4, daytime, evening, test result was inconsistent, etc.Answering for 2,3 Design of Problems sides is the Switching Power Supply common fault, is subjected to the condition restriction such as at that time device technology making, and 4 problems are that PfC rose voltage stabilizing technique and is still in the world the discussion state at that time, and domestic technique more can't provide relevant support.The voltage difference in evening on daytime is exactly the key point of test error.But can not answer all the time to 1 problem.Until under friend introduces, visited the direct current machine factory of the considerable scale in Shanghai behind the some months, just suddenly see the light.Behind the design side test the data obtained, described roughly motor load power curve, greatly differed from each other with the design's output characteristic of power source curve, this is the basic reason of test error.Inquire privately which kind of power supply is person skilled adopt, just learn it is Siemens's variable frequency power supply.With the stranded manufacturer of this thing announcement, problem has obtained solution at once.
Though this time design belongs to unsuccessfully, the Optimality of constant-power power source and stability also allow eye one bright really.
Real row 2:(diagram 7) (sees Figure of description 2 diagrams 7 for details)
The first half of the year in 2002, the company that the first inventor is set up has obtained an envelope tender, be that one group of 50AH60V dynamic lithium battery group designs a charger, charging current 0,2C (10A), charging interval 6～～8 hour, charging current reduces gradually stage by stage until the end of charging.According to specification requirement, the first inventor has designed the permanent power charger of a 500W, and during the actual measurement charging, about the voltage 40V of bottom, charging current is about 12A, and electric current only falls about gA during to 58V, closes breakpoint and be 58,8V, substantially meets the requirements.Contrast test is done in totally 12 design samples of bid, and the design's product ranks first unexpectedly.Carefully state reason by the chief engineer of demanding party, just know reason.The stream mode that subtracts of other charger, have chronologically, with good grounds voltage build-up rate, also with good grounds capacity check and set charging current, which kind of scheme no matter, the problem of charging current sudden change is arranged, no matter be charging or discharge, mutation current is the major reason that causes circulating battery to shorten useful life.Because of the level and smooth charging curve of permanent power charger minimum to the damage of battery, though with desirable some error of charging curve, the charging interval is short to have become a technical advantage.The tenderer proposes to supply 20 chargers immediately, carries out the Stability and dependability test again.As passing through this test, note is ordered long-term supply contract.Our company organizes production very soon, has fulfiled delivery ahead of schedule, and after on probation, the tenderer has pointed out the nibs of portioned product, and technical staff immediately scene processes.Test is all passed through, and has taken whole payment for goods, and has signed the supply contract in 1 year.Company has held the glee feast meeting for this reason.Be unaware of an afterdinner tragedy and caused the situation sudden change.Husky development zone under Hangzhou, production office ground of company, only hundreds of meters apart from limit, the Qiantang River.Member of the board of directors after the dinner party (main investor) approximately an office lady go to limit, the Qiantang River to play, unfortunate being swept away by tidewater died, local TV station and each large newspaper office all had report as to this, and mentioning certain automation equipment Co., Ltd in the literary composition is exactly our company.This accident allows whole company be absorbed in great predicament, so incident is on duty the time, and unit has born prime responsibility, has paid again huge dead compensation and compensation in the funds source that broken, and finally causes break, makes us sighing with despair.
Example 3:(diagram 8) (sees Figure of description 3 diagrams 8 for details)
Several common foundation affiliates gathered together and chatted the second half year in 2006, had summed up former failed lesson, and the from the beginning idea of recurrence has been arranged.Because of the harrowing experience of last time, the heavy economic burden of having given everyone back.Through the half a year of market survey how widely, determine that at last R﹠D direction is the heart-high frequency pulse power supply in the electromachining equipment.
EDM Technology be it is found that before half a century, controlled ability and reached its maturity along with computer numerical control level and high-frequency impulse electric energy, more and more was applied in metal and processed especially Mould Machining field.The EDM Technology principle is said very simple, exactly electrode and the work metal object that designs kept trying one's best little distance (being referred to as the gap), between electrode and metal objects, apply the DC pulse electric energy (also having part to adopt the alternating-current pulse electric energy) of nearly hectovolt, will produce Spark Discharges between the two, metal objects can produce the chip (Dian Erosion that comes off near the electrode place).The individual pulse energy is large, longer duration, and detrital grain is large, and working (machining) efficiency is high, but metal object poor surface smoothness (vice versa).Electrode or metal objects are carried out relative displacement by the good program command of Computer Design and keep stablizing of discharge (processing), when instruction all is finished, process finishing, the apperance of metal objects is exactly the apperance of computer settings.Here it is electric machining principle and process.The key core of electromachining equipment is high frequency pulse power supply, owing to the requirement according to reality processing, can provide several and pacify to the peak currents of hundreds of peace, and the duration, several microseconds were to a few tens of milliseconds.With above-mentioned condition, be the power supply of the low internal resistance of a high power capacity, from Industrial Frequency Transformer Power Management Design theory, be similar to the large capacity power source of low internal resistance of the isallobaric device structure of ring ox and pond Mo alloy.The people who understands Switching Power Supply principle and performance can ask use Switching Power Supply why not, and high frequency pulse power supply is close with the Switching Power Supply principle, should use.But the people who designed Switching Power Supply knows, the Switching Power Supply maximum pulse width only is more than 20 microseconds (20 kc), the control overshoot all at this moment between in the section.For the overshoot more than several milliseconds, it can only take simple perfectly way: turn-off output, therefore be not suitable for electromachining equipment.
Retell now another prior problem: output short-circuit.Above we have introduced the electric machining operation principle, its machining gap has determined working (machining) efficiency, and the enough little machining gap phenomenon that can often be short-circuited, row as vibration, mechanical feed is loosening etc., and reason all can cause short circuit.Something of my personal experience is amplified firecrackers apart from tens meters of processing stand, and the result causes wire cutting machine short circuit in more than ten minute, and the user of all electromachining equipments had similarly experience.
Catastrophic consequence occured when both having needed strong and powerful pulse electric energy to prevent short circuit again, and existing high frequency pulse power supply all adopts enough large current-limiting resistance to prevent the infringement that short circuit causes.But these current-limiting resistances have but consumed a large amount of electric energy under normal circumstances.Here it is high-tech is inefficient main cause.
This of my design is a small electrical process equipment, and main application is that the aperture less than 100mm thickness metal objects runs through, breaking of rod head, the elimination of broken tap, and the small-sized cavity processing of metal objects.Its high frequency pulse power supply adopts the permanent power high frequency pulse power of my innovation and creation, peak power output is 500W, characteristics are to remove all current-limiting resistances, the output of pulse power pipe is all in parallel, improved greatly the power utilization rate, also reduce greatly oneself power consumption, improved thermal stability.
Below be the related data of this high frequency pulse power supply practical effect and Real-time Collection, also have the real data lateral comparison of carrying out same machining collection with the same category of device of domestic product:
Getting a thickness is that the 50mm area is the square mould steel of 100mm, is that the hollow brass tube of 6mm connects with diameter.The pulse duration of this apparatus settings is 10 microseconds, and the interval ratio is 1: 3, gap voltage 12V, and operating current 30A, the perforation time, actual measurement input power power was 436W less than 12 minutes.Calculating the power supply effective value by real work is that gap voltage multiply by operating current divided by actual input power:
(12V×30A)÷436W＝82.5％
Same kind of domestic equipment lateral comparison test and real-time data collection are as follows:
Carry out above-mentioned action, pulse duration is 24 microseconds, interval 0.8, gap voltage 10v, operating current 12A, 40 minutes perforation time, actual measurement input power power 850w.The measuring and calculating power-efficient:
(10v×12A)÷850W＝14.11％
Actual total power consumption: new equipment: 0.436kw * 5/1 hour=0.0872kw/ hour (degree)
Domestic same category of device: 0.850kw * 2/3 hour=0.5667kw/ hour (degree)
The two power consumption is than approximately 1 to 6.5
Compare with similar products at home and abroad, this product has environmental protection (High Power Factor), and energy-conservation, speed is fast, the technological merits such as Heat stability is good.
Below introduce formation and the characteristics of this high frequency pulse power supply:
Because this product is portable, the environment for use more complicated, equipment makes and is large electric current hard pulse in addition, and harmonic current and abundant is not suitable for the chips such as single-chip microcomputer between ground wire and the power line.Designed the FWM circuit (seeing figure) that 555 integrated circuits and optocoupler consist of for this reason.This circuit simple and stable, antijamming capability is strong, and is with low cost, and effect is fine.
The application of constant-power power source, the inventor once did many explorations, ultrasonic cleaner power supply (output 500W-1500W such as 1500W, adopt the output of 3525 integrated circuits and full bridge power transducing), fast wire edm cutter wire storage tube direct current machine Constant-power drive, trial-production of the Constant-power drive of stepping motor and three-state (constant voltage, constant current, permanent power) DC power supply etc.And the design's formation and simple, easily integrated and modularization makes things convenient for user design to make.
Claims (3)
1. the DC power supply with constant power output characteristic is only set limiting voltage and limiting current, and power output is adjustable continuously.It is characterized in that: behind the load access constant-power direct-current power output end, as long as enter the constant power output characteristic curve, the variation of its internal resistance can cause that electric current and voltage changes, but the direct current power numerical value in the load is constant.
2. constant-power direct-current power supply according to claim 1 is characterized in that: adopting fixedly in the pulse excitation signal of Switching Power Supply, the mode (under the condition of preposition constant voltage) of Ton-Toff (between pulsewidth and arteries and veins) is realized.
3. constant-power direct-current power supply according to claim 1, it is characterized in that: the setting of limiting voltage and limiting current is adjustable continuously.But this adjusting just changes output characteristic curve but not output power value.
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| CA2221000A1 (en) * | 1995-05-24 | 1996-11-28 | Ast Research, Inc. | Constant power battery charger |
| US6122180A (en) * | 1998-12-18 | 2000-09-19 | Fairfield Korea Semiconductor Ltd. | SMPS with constant power control circuit |
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Application publication date: 20130918 |