CN1858964A - Circuit system for providing stable voltage variable constant current output - Google Patents
Circuit system for providing stable voltage variable constant current output Download PDFInfo
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- CN1858964A CN1858964A CN 200510030803 CN200510030803A CN1858964A CN 1858964 A CN1858964 A CN 1858964A CN 200510030803 CN200510030803 CN 200510030803 CN 200510030803 A CN200510030803 A CN 200510030803A CN 1858964 A CN1858964 A CN 1858964A
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Abstract
This invention discloses a circuit system for providing a variable voltage regulation constant output, which can reduce the cost of a circuit system providing the voltage regulation variable constant current output and reduce its power loss while the limit of chips is not rigorous such as in a fixed table.In this invention, PWM kind switch supply chips are used to provide negative feed backs of voltage and current by its internal two error amplifiers to realize output of constant current voltage and alter the volume of the constant current by altering the reference voltage of the current negative feed back loop by the control signal.
Description
Technical field
The present invention relates to Circuits System, particularly provide relevant Circuits System with power supply.
Background technology
Power supply is part in electronics and the electric equipment, and along with the progress of battery technology and the reduction of cost, a lot of electronics and electric equipment use battery as power supply or stand-by power supply.As the power supply that can reuse, rechargeable battery has obtained development faster, and rechargeable battery has multiple different type, for example lead-acid battery, nickel-cadmium cell, Ni-MH battery, lithium ion battery etc.Wherein, lithium ion battery has little, in light weight, the advantages such as self-discharge rate is low, memory-less effect of volume, has obtained using widely.
The capacity of rechargeable battery (Capacity is called for short " C ") generally calculates with MAH (mAh), and on behalf of the capacity of this battery, the CmAh capacity be equivalent to the energy of exporting with stable electric current C milliampere (mA) in one hour.When rechargeable battery is charged, if the capacity of this battery is CmAh, General Definition is charged as trickle charge with the electric current of 0.1C～0.2CmA, be charged as soon with the electric current of 0.2CmA and fill, electric current with 0.8CmA is charged as supper-fast charging, is charged as trickle charge with the electric current of 0.05C～0.1CmA.Rechargeable battery with a joint 1400mAh is an example, and charging current being at a slow speed between 140mA～280mA charged.
In wireless terminal, for ambulant purpose, rechargeable battery is widely used.For example, in fixed station, rechargeable battery just often uses as stand-by power supply, so that it keeps conversation or holding state when no external power source, obtains the unexistent advantage of landline telephone.Fixed station is the relatively-stationary terminal in position that adopts wireless access, be applicable to the place that telephones such as train, steamer, bus, field work fail to lead to, solve wired conversation problem that is difficult to covering area, be particularly suitable as the special-purpose long distance lines of public telephone and group and use.Because the mobility of fixed station is less demanding, to the restriction of its volume and weight unlike harsh for portable terminal, can realize high reception sensitivity and bigger transmitting power, thereby can expand the effective coverage range of cellular network greatly, enlarge networking user's amount of commmunication company, have the good utilization of resources.In general, operator is to the restriction of wireless access fixed station function for convenience, and fixed station also can provide functions such as lock machine, pintle hook lock, lock sub-district.For example, can limit fixed station and belong to a base station, can only in the sub-district that this base station covers, use.
Movable equipment for using rechargeable battery can effectively reduce power consumption, and the service time and the useful life that prolong battery are keys of design.The power management part manages the power supply of entire equipment, comprises power source conversion, switching on and shutting down control and management of charging and discharging etc.Realize the charging of rechargeable batteries for some miscellaneous equipments of cooperating equipment, generally except being used for the power supply adaptor of AC/DC conversion, the other parts of power management all realize at device interior.
Reasonably charging circuit and charging algorithm can be given full play to the potentiality of rechargeable battery, prolong its useful life relatively.Taking it by and large, the charging scheme of rechargeable battery is mainly contained two kinds of current constant mode and constant voltage modes.So-called constant current is promptly charged to rechargeable battery with constant current; So-called constant voltage is promptly charged to rechargeable battery with stable voltage.In order to prolong the useful life of rechargeable battery, improve the performance of rechargeable battery, the rechargeable battery of some type needs charging circuit that the charging of current constant mode and constant voltage mode can be provided simultaneously.For example, lithium battery is in improper use, for example overcharge, cross and to cause the infringement of lithium battery when putting or scrap, it is just relatively harsher for the requirement of charging circuit, than higher, its charging modes is the constant current voltage regulation way to the stability requirement of output voltage and electric current, and in order to prolong the useful life of lithium battery, for lithium battery and the battery capacity approaching lithium battery that be full of of power consumption, also need to adopt the mode of voltage stabilizing trickle charge above certain limit, brownout.
Need design especially, constant with the output voltage of realizing circuit and electric current, and constant current value is variable.
Existing technical scheme utilizes low pressure difference linear voltage regulator (Low Dropout VoltageRegulator is called for short " LDO ") that voltage stabilizing is provided, and the current channel of different constant current values is provided respectively by two different current channels.LDO can provide the output voltage of higher noise and ripple rejection ratio, and can be at printed circuit board (PCB) (Print Circuit Board, be called for short " PCB ") on realize in the very little area, therefore relatively be adapted at using in the charging circuit of portable electronic such as portable terminal or electric equipment products.The prior art scheme is the method that industry generally adopts, and in the design guidelines of most of producers the prior art scheme is generally all used in the suggestion of design charging circuit.
The schematic diagram of the Circuits System of using in the charging circuit of rechargeable battery that stable voltage variable constant current output is provided of prior art scheme as shown in Figure 1.
Wherein, VEXT_DC, VREG_PHONE, VREG_MSMP, CHG_EN and V_BATT are the pin of special-purpose power management chip.VEXT_DC is the external power supply adaptor signal to the power source special managing chip, in order to monitoring external power supply voltage; VREG_PHONE is the supply power voltage of handheld device or fixed station, in order to detect supply power voltage; VREG_MSMP is the voltage stabilizing output of power source special managing chip; CHG_EN is general input and output (General Purpose Input/Output is called for short " GPIO ") port, is the control signal of trickle charge mode; V_BATT is the signal of cell voltage to the power source special managing chip, in order to the monitoring cell voltage.
In the circuit shown in Figure 1, the power supply adaptor of external band current-limiting function has the ability of voltage stabilizing output, constant current output.When the voltage of GPIO port CHG_EN when low, triode Q1 and metal-oxide semiconductor (MOS) (Metal-oxide semiconductor is called for short " MOS ") pipe Q2 all opens, external power supply is battery charge with big current system by metal-oxide-semiconductor Q2; When the voltage of GPIO port when being high, triode Q1 and metal-oxide-semiconductor Q2 all close, and external power supply is that battery carries out trickle charge by diode D2.As can be seen, the passage of diode D2 uses resistance R 3 to drag down the electric current that battery is charged, and obtains constant little electric current output, realizes trickle charge.
In actual applications, there is following problem in such scheme: the prior art scheme is had relatively high expectations to external power supply adaptor, realize that cost is higher, and power consumption is bigger.
Cause the main cause of this situation to be, since LDO for the stability requirement of input voltage than higher, therefore need to use the special-purpose higher external power adapter of cost, and because the LDO use occasion is special relatively, output is not very big, its cost is also higher, has caused prior art scheme cost higher; In addition,, increased the quantity of device, consider that increasing device all can increase extra power consumption, so the power consumption of the Circuits System of prior art has been relatively large because different passages is used in the constant current of different sizes in the prior art scheme.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of Circuits System that stable voltage variable constant current output is provided, make that in the die size restriction be not very harsh occasion, for example in the fixed station, can reduce the cost of the Circuits System that stable voltage variable constant current output is provided and reduce its power consumption.
For achieving the above object, the invention provides a kind of Circuits System that stable voltage variable constant current output is provided, comprise:
The power supply generation module wherein comprises pulse width modulation class switching power source chip, is used to utilize voltage negative feedback and Current Negative Three-Point Capacitance to control the output that described pulse width modulation class switching power source chip is realized pressure-stabilizing constant flow;
Current Negative Three-Point Capacitance reference voltage generation module is used for changing the size of current of the reference voltage of described Current Negative Three-Point Capacitance with control output constant current according to control signal.
Wherein, described control signal is controlled the conducting of interior triode of described current feedback reference voltage generation module or MOS (metal-oxide-semiconductor) transistor and is ended, and changes the reference voltage of described Current Negative Three-Point Capacitance.
In this external described system, described pulse width modulation class switching power source chip comprises first error amplifier and second error amplifier, is respectively applied for to realize voltage negative feedback and Current Negative Three-Point Capacitance.
In this external described system, the input signal of the in-phase input end of described first error amplifier is the stable voltage variable constant current output point signal of described system, and the input signal of its inverting input is the voltage signal of desired output.
In this external described system, also comprise the output voltage generation module, described output voltage generation module is used to use the reference voltage of described pulse width modulation class switching power source chip output to generate the described voltage signal of desired output.
In this external described system, also comprise the Current Negative Three-Point Capacitance channel module that is used for providing the Current Negative Three-Point Capacitance passage between the stable voltage variable constant current output point of described second error amplifier input and described system, described Current Negative Three-Point Capacitance channel module is connected with the stable voltage variable constant current output point of in-phase input end, inverting input and the described system of described second error amplifier respectively.
In this external described system, the reference voltage of described Current Negative Three-Point Capacitance inserts the in-phase input end of described second error amplifier by resistance.
In this external described system, described power supply generation module also comprises rectification filtering module, and described rectification filtering module is used for the signal of the described pulse width modulation class switching power source chip of exporting with the form of the low saturation voltage drop of PNP power tube is carried out the output of rectifying and wave-filtering generation pressure-stabilizing constant flow.
In this external described system, described pulse width modulation class switching power source chip is TL494.
In addition, described system uses in fixed station, and the output of the stable voltage variable constant current of described system is used for the battery of described fixed station is charged.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, use the PWM class switching power source chip of producing in enormous quantities, the output that utilizes two error amplifiers of its inside to provide the voltage and current negative feedback to realize the constant current voltage stabilizing respectively, the reference voltage that changes the Current Negative Three-Point Capacitance loop by control signal changes the size of constant current simultaneously.
Difference on this technical scheme has brought comparatively significantly beneficial effect, and promptly because the output of PWM class switching power source chip is very big, so cost is very low, so the present invention program can reduce the cost of circuit greatly; The second, the present invention program changes the reference voltage in Current Negative Three-Point Capacitance loop to change the size of constant current by control signal, needn't use two independently current channels, therefore can reduce the power consumption of system; The 3rd, some devices that comprise diode have also been saved in the minimizing of current channel, have further reduced the cost that system realizes, thereby have made product have more competitiveness.
Description of drawings
Fig. 1 is the schematic diagram of the Circuits System of using in the charging circuit of rechargeable battery that stable voltage variable constant current output is provided of prior art scheme;
Fig. 2 is the basic principle schematic of transistor switch translation circuit;
Fig. 3 is the degenerative principle schematic of voltage;
Fig. 4 is the principle schematic of Current Negative Three-Point Capacitance;
Fig. 5 is that the Circuits System that stable voltage variable constant current output is provided of first better embodiment according to the present invention is formed schematic diagram;
Fig. 6 is the composition of the Current Negative Three-Point Capacitance reference voltage generation module inside of first better embodiment according to the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Need the occasion of constant current voltage stabilizing output at some, do not have requirement, needn't use to take the less LDO of PCB area and realize for the volume of device.Use cost of the present invention is lower but take the big slightly pulse-width modulation of PCB area (Pulse Width Modulation, abbreviation " PWM ") switching power source chip of class, two error amplifiers that utilize chip to carry realize that respectively the negative feedback of electric current and voltage is to obtain the output of constant current voltage stabilizing, the present invention does not need to use different current channels to obtain different constant current output, but change the input reference voltage of the error amplifier of realizing Current Negative Three-Point Capacitance, thereby change the size of current of constant current output by an enable signal.Wherein, error amplifier is to be used for the power amplifier of exporting and the standard input compares with the generation error controling signal.Because the switching power source chip output of PWM class is very big, cost is very low, so the present invention program can reduce cost greatly, in addition because the present invention program has reduced current channel, saved the devices such as diode on the current path, therefore can obviously reduce power consumption and further save cost.
In order to understand the present invention program better, at first briefly introduce PWM, the principle of voltage negative feedback regulation and Current Negative Three-Point Capacitance current stabilization.
PWM is mature technique in the Switching Power Supply design, it is a kind of power control mode, it utilizes the pulse of different duty to have the principle of different DC component, when load changes, by adjusting the purpose that duty recently reaches regulated output voltage,, irrelevant with load characteristic because driving pulse has stable frequency, so pulse-width modulation is easy to realize, thereby is widely used.
Transistor switch translation circuit commonly used is widely used circuit among the PWM, and its basic principle as shown in Figure 2.Wherein, Ton is the ON time of transistor Q, in ON time, the electric current in the inductance L increases gradually, after conducting finishes, enter the shut-in time Toff of transistor Q, electric current reaches maximum in this moment inductance L, because for the electric current in the inductance can not suddenly change, diode D serves as continued flow component to be made and continue to have electric current by until the ON time that enters transistor Q in the inductance L, electric current among the L reaches minimum value at this moment, enters the new cycle then.The time that is appreciated that Ton is long more, and the direct voltage of output is just big more relatively.Vf is a sampling feedback voltage, and this voltage can be by the ON time Ton of comparison amplifier oxide-semiconductor control transistors Q, so just can reach the purpose of regulated output voltage by the control pulsewidth.
For example, the TL494 chip is exactly the switching power source chip of a kind of frequency PWM class that can be provided with arbitrarily.Wherein, the TL494 chip comprises reference voltage generating circuit, oscillating circuit, intermittent phase adjustment circuit, two compositions such as error amplifier, pulse-width modulation comparator and output circuit.Wherein, 1,2 pin are homophase and inverting inputs of first error amplifier; 3 pin are the feedback input ends that are used for phasing and gain controlling; 4 pin are the intermittent phase conditioning, can make deadline from 2% linear change to 100% when adding 0～3.3 volt of (V) voltage thereon; 5,6 pin are respectively applied for external oscillation resistance and oscillating capacitance; 7 pin are earth terminal; 8,9 pin and 11,10 pin are respectively inner two the final stage output triode collector and emitters of TL494; 12 pin are power supply side; 13 pin are output control terminal, are the single-ended way of output in parallel during this pin ground connection, when connecing 14 pin for recommending the way of output; 14 pin are the 5V reference voltage output end, maximum output current 10mA; 15,16 pin are anti-phase and in-phase input ends of error amplifier II.The concussion frequency of TL494 is determined f ≈ 1.1/Rt*Ct by 5,6 pin external Ct and Rt; The saw-tooth oscillation ripple that oscillator produces is delivered to the inverting input of PWM comparator, and pulse width modulated voltage is delivered to the in-phase input end of PWM comparator, compares the impulse wave of output certain width by the PWM comparator.When transferring wide change in voltage, the pulse duration of TL494 output also changes thereupon, thereby changes the ON time Ton of switching tube, reaches the purpose of adjusting, regulated output voltage.In order to improve the stability of entire circuit, two error amplifiers of TL494 inside, the feedback input end of first error amplifier, second error amplifier and 3 pin should connecting resistance electric capacity (RC) network during use.
The degenerative principle of voltage as shown in Figure 3.Characteristics according to operational amplifier can calculate
Like this, even output loading changes, still can utilize stable Vref3 to obtain stable Vo3 output.
The principle of Current Negative Three-Point Capacitance as shown in Figure 4.Characteristics according to operational amplifier can draw
If make R41=R44, R42=R43 then has
Below in conjunction with preferred embodiment of the present invention the present invention program is described.
The Circuits System that stable voltage variable constant current output is provided of first preferred embodiment is formed as shown in Figure 5 according to the present invention.
The Circuits System that stable voltage variable constant current output is provided is mainly by forming with lower module: the PWM class switching power source chip 10 with at least two error amplifiers, dead band voltage generation module 20, current feedback reference voltage generation module 30, output voltage generation module 40, phasing gain control module 50, Current Negative Three-Point Capacitance channel module 60 and rectification filtering module 70.In the present invention's first preferred embodiment, PWM class switching power source chip 10 adopts the TL494 chip.
Wherein, PWM class switching power source chip 10 has at least two error amplifiers, stable reference voltage can be provided, and the PWM power supply be provided and adopt the form of the low saturation voltage drop of PNP power tube to output to rectification filtering module 70 according to the control of its inside first error amplifier and second error amplifier.In the present invention's first preferred embodiment, the input of the power supply of TL494 chip can have very big dynamic range, and the conversion of process its internal circuit can provide stable 5V reference voltage by 14 pin.
Dead band voltage generation module 20 is used to utilize the reference voltage of PWM class switching power source chip 10, generates the control signal of the dead band voltage control pin of input PWM class switching power source chip 10.The empirical tests pulsewidth is that 50% o'clock effect in whole cycle is best, and as calculated, in the present invention's first preferred embodiment, the input voltage that dead band voltage generation module outputs to dead band voltage control pin is 1.14V.
Current feedback reference voltage generation module 30 is used for generating according to control signal CHG_EN the reference voltage of the current negative feedback circuit that varies in size, and this reference voltage is connected to the inverting input of second error amplifier in the PWM class switching power source chip 10 by resistance R 54.Wherein, control signal CHG_EN is used to control the size of constant current output, in the present invention's first preferred embodiment, current feedback reference voltage generation module 30 is according to the reference voltage in the difference change current negative feedback circuit of the CHG_EN signal of input, promptly be equivalent to change the Vref4 among Fig. 4, those skilled in the art will recognize that the reference voltage that changes current negative feedback circuit promptly can the linear size that changes its output current.In the present invention's second preferred embodiment, thereby Current Negative Three-Point Capacitance reference voltage generation module 30 uses CHG_EN control metal-oxide-semiconductor or triode conducting or by the reference voltage that changes output, its circuit theory diagrams as shown in Figure 6.When CHG_EN when low, Q6 is a high impedance, is about 4.44V with Vo6 behind the electric resistance partial pressure of 3.09K by the voltage that resistance R 54 inserts the second error amplifier inverting input; As CHG_EN when being high, the Q6 conducting is pulled to about 0.45V with Vo6 place voltage, and the voltage that inserts the second error amplifier inverting input by resistance R 54 is about 0.7V.
Output voltage generation module 40 is used to utilize the reference voltage of PWM class switching power source chip 10, generates the inverting input that output voltage is also imported this voltage first error amplifier.According to the degenerative principle of voltage as shown in Figure 3, output voltage approximates the voltage of inverting input, therefore use the stable reference voltage of PWM class switching power source chip 10 outputs, the inverting input voltage that generates expectation voltage control first error amplifier promptly can reach the purpose of regulated output voltage.Wherein, in the present invention's first preferred embodiment, the stable reference voltage of PWM class switching power source chip 10 outputs can be obtained the voltage of expectation by simple electric resistance partial pressure, this voltage input is realized the inverting input of degenerative first error amplifier of voltage can be at the stable output voltage that output obtains and this voltage is approximate.
Phasing gain control module 50 is used for being used for the signal of phasing and gain controlling and being input to PWM class switching power source chip 10 corresponding pins according to the input signal generation of the first error amplifier inverting input.Wherein, phasing gain control module 50 is used to improve the stability of system, persons of ordinary skill in the art may appreciate that this module can realize by simple RC network.
Current Negative Three-Point Capacitance channel module 60 is used for providing the passage of Current Negative Three-Point Capacitance between the input of the constant current voltage stabilizing output point and second error amplifier.Those of ordinary skill in the art understands, Current Negative Three-Point Capacitance channel module 60 can be realized by simple resistor network, can realize satisfying the electric current output that constant current output requires by the appropriate design current negative feedback circuit, it realizes that principle can not describe in detail at this with reference to Fig. 4.
Rectification filtering module 70 is used for the signal through the low saturation voltage drop form output of PNP power tube of PWM class switching power source chip 10 is carried out rectifying and wave-filtering, and the signal behind the rectifying and wave-filtering is outputed to constant current voltage stabilizing output point by diode D5.The output of constant current voltage stabilizing output point can be used as power supply and is connected on battery 80 or other device.Wherein, rectification filtering module 70 can be realized with reference to transistor switch translation circuit commonly used shown in Figure 2.
In addition, need to prove,, also the signal of constant current voltage stabilizing output point is imported the in-phase input end of first error amplifier in order to realize the voltage negative feedback.
Battery 80 is connected between constant current voltage stabilizing output point and the earth point, utilizes the output of constant current voltage stabilizing output point to charge.In the present invention's first preferred embodiment, battery 80 is a lithium ion battery.
External power supply provides module 90 to be used for external power supply is converted to the input power supply of PWM class switching power source chip 10 uses and offers PWM class switching power source chip 10.In the present invention's first preferred embodiment, because the input voltage dynamic range of TL494 chip is very big, provide the output voltage stability of module 90 to require not to be very high for external power supply, therefore needn't use special-purpose power supply adaptor.
Those of ordinary skill in the art are appreciated that, core of the present invention promptly has been to utilize two error amplifiers in the PWM class switching power source chip 10 to realize that respectively thereby voltage negative feedback and Current Negative Three-Point Capacitance provide constant current voltage stabilizing output, simultaneously in order to change the size of constant current output, thereby the reference voltage that also utilizes current feedback reference voltage generation module 30 to change the Current Negative Three-Point Capacitance loop according to control signal CHG_EN changes the size of constant current output.Can on this principle, carry out some variations, not depart from essence of the present invention specific implementation of the present invention.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. the Circuits System that stable voltage variable constant current output is provided is characterized in that, comprises the power supply generation module and the Current Negative Three-Point Capacitance voltage generation module that use pulse width modulation class switching power source chip control output voltage and size of current, wherein,
Described power supply generation module is used to utilize voltage negative feedback and Current Negative Three-Point Capacitance to control the output that described pulse width modulation class switching power source chip is realized pressure-stabilizing constant flow;
Described Current Negative Three-Point Capacitance reference voltage generation module is used for changing according to control signal the size of current of the reference voltage control output constant current of Current Negative Three-Point Capacitance.
2. the Circuits System that stable voltage variable constant current output is provided according to claim 1, it is characterized in that, described control signal is controlled the conducting of interior triode of described current feedback reference voltage generation module or MOS (metal-oxide-semiconductor) transistor and is ended, and changes the reference voltage of described Current Negative Three-Point Capacitance.
3. the Circuits System that stable voltage variable constant current output is provided according to claim 1, it is characterized in that, described pulse width modulation class switching power source chip comprises first error amplifier and second error amplifier, is respectively applied for to realize voltage negative feedback and Current Negative Three-Point Capacitance.
4. the Circuits System that stable voltage variable constant current output is provided according to claim 3, it is characterized in that, the input signal of the in-phase input end of described first error amplifier is the stable voltage variable constant current output point signal of described system, and the input signal of its inverting input is the voltage signal of desired output.
5. the Circuits System that stable voltage variable constant current output is provided according to claim 4, it is characterized in that, also comprise the output voltage generation module, described output voltage generation module is used to use the reference voltage of described pulse width modulation class switching power source chip output to generate the described voltage signal of desired output.
6. the Circuits System that stable voltage variable constant current output is provided according to claim 3, it is characterized in that, also comprise the Current Negative Three-Point Capacitance channel module that is used for providing the Current Negative Three-Point Capacitance passage between the stable voltage variable constant current output point of described second error amplifier input and described system, described Current Negative Three-Point Capacitance channel module is connected with the stable voltage variable constant current output point of in-phase input end, inverting input and the described system of described second error amplifier respectively.
7. the Circuits System that stable voltage variable constant current output is provided according to claim 3 is characterized in that the reference voltage of described Current Negative Three-Point Capacitance inserts the in-phase input end of described second error amplifier by resistance.
8. the Circuits System that stable voltage variable constant current output is provided according to claim 1, it is characterized in that, described power supply generation module also comprises rectification filtering module, and described rectification filtering module is used for the signal of the described pulse width modulation class switching power source chip of exporting with the form of the low saturation voltage drop of PNP power tube is carried out the output of rectifying and wave-filtering generation pressure-stabilizing constant flow.
9. the Circuits System that stable voltage variable constant current output is provided according to claim 1 is characterized in that described pulse width modulation class switching power source chip is TL494.
10. the Circuits System that stable voltage variable constant current output is provided according to claim 1 is characterized in that, described system uses in fixed station, and the output of the stable voltage variable constant current of described system is used for the battery of described fixed station is charged.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101881983A (en) * | 2010-04-16 | 2010-11-10 | 北京利云技术开发公司 | Numerical-control low-noise high-power-supply-rejection-ratio low-dropout regulator |
| CN101770247B (en) * | 2010-01-07 | 2012-12-19 | 国家电网公司 | Portable power-frequency constant current source device |
| CN107425731A (en) * | 2017-08-28 | 2017-12-01 | 丰县宏祥电子科技有限公司 | The special high power D C DC12V30A converters of miniature electric automobile |
| CN107817859A (en) * | 2017-10-30 | 2018-03-20 | 深圳市道通智能航空技术有限公司 | A kind of cell voltage filtering method and device |
| CN108886343A (en) * | 2017-12-15 | 2018-11-23 | 深圳市汇顶科技股份有限公司 | Negative feedback amplifier circuit |
| CN111463855A (en) * | 2020-04-02 | 2020-07-28 | 无锡艾为集成电路技术有限公司 | Charging control circuit and charging control method, electronic equipment and charging method thereof |
Family Cites Families (4)
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| JP3131364B2 (en) * | 1994-11-28 | 2001-01-31 | シャープ株式会社 | Chopper type regulator circuit and chopper type regulator IC |
| JPH08223907A (en) * | 1995-02-06 | 1996-08-30 | Internatl Business Mach Corp <Ibm> | Power unit and power supply supplying method |
| CN2553414Y (en) * | 2002-07-05 | 2003-05-28 | 北京通力环电气股份有限公司 | PWM type high frenquency switch power supply constant voltage/constant current controller |
| JP3944605B2 (en) * | 2002-09-30 | 2007-07-11 | ローム株式会社 | Switching power supply |
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2005
- 2005-10-27 CN CNB2005100308032A patent/CN100356658C/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101770247B (en) * | 2010-01-07 | 2012-12-19 | 国家电网公司 | Portable power-frequency constant current source device |
| CN101881983A (en) * | 2010-04-16 | 2010-11-10 | 北京利云技术开发公司 | Numerical-control low-noise high-power-supply-rejection-ratio low-dropout regulator |
| CN101881983B (en) * | 2010-04-16 | 2012-03-28 | 北京利云技术开发公司 | Numerical-control low-noise high-power-supply ripple suppression low-dropout regulator |
| CN107425731A (en) * | 2017-08-28 | 2017-12-01 | 丰县宏祥电子科技有限公司 | The special high power D C DC12V30A converters of miniature electric automobile |
| CN107817859A (en) * | 2017-10-30 | 2018-03-20 | 深圳市道通智能航空技术有限公司 | A kind of cell voltage filtering method and device |
| CN108886343A (en) * | 2017-12-15 | 2018-11-23 | 深圳市汇顶科技股份有限公司 | Negative feedback amplifier circuit |
| CN108886343B (en) * | 2017-12-15 | 2021-12-21 | 深圳市汇顶科技股份有限公司 | Negative feedback amplifying circuit |
| CN111463855A (en) * | 2020-04-02 | 2020-07-28 | 无锡艾为集成电路技术有限公司 | Charging control circuit and charging control method, electronic equipment and charging method thereof |
| CN111463855B (en) * | 2020-04-02 | 2022-04-29 | 无锡艾为集成电路技术有限公司 | Charging control circuit and charging control method, electronic equipment and charging method thereof |
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| CN100356658C (en) | 2007-12-19 |
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