CN203562821U - Current-adjustable battery charging circuit - Google Patents
Current-adjustable battery charging circuit Download PDFInfo
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- CN203562821U CN203562821U CN201320763801.4U CN201320763801U CN203562821U CN 203562821 U CN203562821 U CN 203562821U CN 201320763801 U CN201320763801 U CN 201320763801U CN 203562821 U CN203562821 U CN 203562821U
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Abstract
A current-adjustable battery charging circuit is used in electronic devices powered by batteries. The circuit includes a power supply providing power for the electronic devices; the battery charging circuit controls the power supply to output an output current or other parameters; and a feedback circuit adjusts the output of the battery charging circuit, such that the output current or the other parameters can be kept in a predetermined range.
Description
Technical field:
The present invention relates to provide for portable electric appts the Method and circuits of power supply.More specifically, the present invention relates to battery charger.It is characterized in that, the charging current of above-mentioned battery can be adjusted to a limits value.
Background technology:
The enhancing of social mobility is the electronic equipment of portable, battery powered, as notebook computer, video camera and mobile phone have been created huge market.The size of electronic equipment and the requirement to power are constantly dwindled in the development of integrated circuit technique, and making mobile battery power supply replace " wired " power supply becomes urgent requirement.
Generally, battery is safety, compact conformation, portable and easily, thereby makes them be suitable for portable electric appts.In the past, for a shortcoming of the battery of electronic equipment power supply is to need the frequent non-rechargeabel batteries of changing, this has caused cost and inconvenient problem.Rechargeable battery has overcome the shortcoming of frequent replacing battery to a great extent, but still needs frequent charge.
There is integrated battery charger the inside of some portable electric appts, thereby battery also can be charged in the situation that not taking out from equipment.For example, many notebook computers comprise the circuit for battery charging, and when notebook computer is connected to an external power source, this circuit is just as an AC/DC power converter.Such power converter provides a stable output voltage that has maximum rated power or electric current conventionally.
All circuit that the above-mentioned AC/DC power converter with charge function can be designed as portable electric appts provide power supply, simultaneously for the battery of mobile device charges.For example, the AC/DC power converter in a notebook computer may be designed to provide the power of maximum 50 watts: wherein the power of 20 watts provides electric energy, the battery charging that other power of 30 watts is notebook computer for notebook computer itself.
But due to the increase of volume, weight and expense, the AC/DC power converter of design may be operated in the worst power termination situation, this is that we are undesirable.In addition, as shown in Figure 2 A, most of power of power converter may be wasted.Using above-mentioned notebook computer is example, and between battery charge period, 30 watts in 50 watts of power are wasted, and 60% power is not used.
In addition, in portable set, under the control signal of other circuit, battery charger may be worked in the power level of any order of magnitude.This allows an AC/DC power converter to be designed to have the power capacity that is only a bit larger tham portable electric appts needs.For example, if a notebook computer needs the power of 20 watts, can design for it power converter of one 30 watts.As shown in Figure 2 B, when notebook computer is during in idle condition, processor can be battery charger a control signal is provided, and allows it use 30 watts of whole power to charge for battery.On the contrary, when notebook computer is used, above-mentioned processor can be battery charger a control signal is provided, and to limit available battery charge power, is less than approximately 10 watts.Although control battery charge power and reduced the waste of power in discrete level, the power of a part of AC/DC power converter still may not be utilized.
Portable electric appts has adopted a large amount of power-saving technologies, to reduce their average power consumption.For example, a notebook computer may cut out its disc driver and display between lay-up period, or reduces the clock frequency of primary processor.Such electricity-saving function may make the average use power of portable set far below its peak power.As shown in Figure 2 B, unless battery charger can operate under many different power levels, some power may still cannot be used to the charging of battery and be wasted.
Power can not be utilized or cause the use of larger AC/DC power converter because other modes are wasted, or has increased the charging times of battery.For example, an equipment need to completely be full of battery in two hours, if some power are wasted, just needed a larger AC/DC power converter.Because size and the weight of an AC/DC power converter generally depend on its capacitance, more powerful power supply conventionally than the power converter volume with lower rated power more greatly, heavier, more expensive.
Therefore, need to provide input power is utilized effectively, thereby make the volume of power converter less, weight is lighter, cost is lower, keep the circuit of best battery charging ability simultaneously.
When the power termination of mobile device is lower, the charging take higher speed as battery; When the power termination of mobile device is higher, take lower speed as battery, charges and also need.
In addition,, due to the power demand of portable electric appts (as notebook computer), under different situations, the charging take different charge rates as battery, also needs with the power that utilizes better power converter.
Summary of the invention:
In view of the foregoing, first object of the present invention is to provide external power source converter circuit less, that lighter, cost is lower for battery powered electronic equipment.
Second object of the present invention is to provide a kind of charging circuit, when the power termination of equipment is lower, and the charging take higher speed as battery; When the power termination of mobile device is higher, the charging take lower speed as battery.
The 3rd object of the present invention is to provide a kind of charging circuit, maximally utilises the power for the external power source transducer of battery charging.
The 4th object of the present invention is to provide a kind of charging circuit, and the charging take different charge rates as battery, to prevent that the gross power of power converter from exceeding certain restriction.
The 5th object of the present invention is to provide a kind of charging circuit, for the battery of this circuit charging and structure the indistinction of other any one batteries.
These objects and other object realize by battery charger provided by the invention, and this circuit comprises a feedback control loop, and this loop control charge rate is with the output current of restriction power supply changeover device.
Technical solution of the present invention:
The present invention is a kind of battery charger of adjustable current, at battery powered portable electric appts.This circuit comprises a power supply for electronic equipment power supply.Output current or other parameters of the output of battery charger control power supply.The output of feedback circuit regulating cell charging circuit, is maintained in preset range output current or other parameters.
Contrast patent documentation: CN203205896U power brick charging circuit 201220737144.1, CN203014466U lithium battery charging circuit module 201320017581.0
Accompanying drawing explanation:
Fig. 1 is a kind of simplified block diagram of power circuit of typical portable electric appts;
Fig. 2 A illustrates the exemplary power service condition of notebook computer, and wherein external power transducer is designed to process the peak power of notebook computer;
Fig. 2 B and 2C illustrate other exemplary power service conditions of notebook computer, and wherein power is limited by battery charger, to adapt to notebook computer, under different discrete levels, work;
Fig. 3 is a kind of power circuit obtaining according to the present invention, is included as the battery charger of notebook computer charging;
Fig. 4 A and Fig. 4 B are respectively that wherein illustrative block diagram is used integrated circuit manufacture according to a kind of explanatory view of the battery charger of principle design of the present invention.
Embodiment:
Fig. 1 is the simplified block diagram of typical power circuit 10 for portable electric appts.System DC/DC transducer 12 provides constant voltage dc source to circuitry 13, and it is the functional circuit of portable electric appts.For example, in a mobile phone, circuit 13 may comprise a digital signal processor, radio transceiver, memory, and various support circuit.In portable operation, circuitry 13 is powered by battery 14.When battery 14 exhausts, it can charge from AC/DC power converter 18 by battery charger 20.
Be used to the power supply that battery 14 recharges to be provided by input power transducer 18, it may convert the AC electric energy in supply socket to be suitable for battery charger 20 and DC/DC transducer 12 a kind of form.In addition, input power transducer 18 can be also a DC/DC transducer, and this transducer is (for example automobile cigarette lighter socket) conversion electric power from a DC source.If for notebook computer, AC/DC power converter 18 normally separates with computer, but also can be built in notebook computer.For example, power converter 18 can be accepted AC power, and provides the DC power supply of 24 volts for notebook computer.
In use, power converter 18 is simultaneously for DC/DC transducer 12 and battery charger 20 provide power supply.Diode 22 and 16, as switch, prevents that power supply from passing through power circuit 10 and flowing into other improper circuit.Particularly, diode 22 prevents that power converter 18 from being when closing or disconnecting, and power converter 18 and battery charger 20 are loaded into battery 14, and diode 16 is while preventing that power converter 18 from providing power supply for DC/DC transducer 12, and battery 14 charges without limit.In many application, diode 16 and 22 is implemented as the switch mosfet of logic control, so that voltage drop and power loss between power converter 18 or battery 14 and DC/DC transducer 12 are minimized.
Under normal circumstances, power converter 18 is to be assessed by its output voltage and maximum current capability.For example, power converter 18 can be assessed as the direct voltage that maximum current is exportable 24 volts of 1.5 ampere-hours.If an electric current is higher than maximum rated current, this may cause the damage of power converter 18 or the reduction of reliability.Therefore, need to guarantee that the total consumed power (the power summation of being drawn by DC/DC transducer 12 and battery charger 20) of portable electric appts is no more than the rated output power of power converter 18.
In order to ensure being no more than its power rating, the power output of input power transducer 18 is conventionally designed to be and is greater than DC/DC transducer 12 and the required maximum gross power of circuitry 13.For example, notebook computer may be operated under the worst case of electric current demand maximum, and now the display of notebook operates under maximum clock speed at rotation, its CPU at work, its hard disk.As mentioned above, circuitry 13 is when work, and battery charger 20 may be limited in low battery charging rate, to guarantee to be no more than the rated power of power converter 18.
Fig. 2 A and 2B represent that the method for two alternative previously knowns comes designing power supply 10 and AC/DC transducer 18.In Fig. 2 A, region 17 is expressed as the power that is input to battery charger 20 when battery 14 charges.Region 15 represents the power of mobile device circuit 13 needs, and it may be over time and different.For example, increased power 21 may represent that notebook computer is because hard disk accelerates rotation or starts the power that display increases.By design AC/DC transducer 18, make its power handling capability restriction 23 be set to enough height, thereby can hold the required maximum load of battery charger 13.But shown in the region 25 in Fig. 2 A, most of capacity of AC/DC transducer 18 is not used.
As shown in Figure 2 B, battery charger 20 can be designed, and it can be operated under two different states.According in the design of prior art, battery charger 20 can charge to battery 14 with two-forty or low rate, and this depends on whether circuitry 13 is opened.For example, if circuitry 13 be close or sleep state (having reduced power consumption), battery charger 20 can obtain power as much as possible from AC/DC transducer 18 as required.But when circuitry 13 is opened (region 15), battery charger 20 is limited to use a less predetermined power level.For example, when circuitry 13 is during in opening, battery charger 20 can be defined only for battery 14 provides a little power.Typically, battery charger 20 is according to a control signal restriction battery charge power in circuitry 13.Although this design allows AC/DC transducer 18 to be designed to have lower rated power than Fig. 2 A, still have some power be wasted (region 25).
Too high design guarantees that power converter 18 can not work exceeding under rated power, and it has also guaranteed that its power handling capability will make full use of most of the time.Therefore, this is by the method for designing that is a kind of favourable power converter 18.
For example, in Fig. 2 C, the power (region 15) that circuitry 13 uses is deducted effectively from the power capacity of AC/DC power converter 18.Power limit 23 and region below, region 15 can be used for battery charger 20.Because battery charger 20 can use part or all of surplus power, the power handling capability of AC/DC power converter 18 can more effectively be used, therefore, AC/DC power converter 18 may be less than known prior art volume, weight is lighter, and cost is lower.
As shown in Figure 2 C, power division arrangement has limited the power demand of battery charger 20 energetically, to guarantee to be no more than the power limit 23 of AC/DC transducer 18.Power Limitation realizes by the power output of monitoring AC/DC transducer 18, and the power demand of controlling battery charger 20 is to guarantee that power output is in margin of safety.In the ordinary course of things, input power transducer 18 has a fixing output voltage, to monitor and limit its output current.Also limited the power output of power converter 18 simultaneously.
Fig. 3 exemplarily provides the circuit for the power supply circuit 10 of Fig. 1 of notebook computer.But the present invention is not limited to such application, those skilled in the art's principle according to the present invention will easily obtain many other example application.
Laptop electric power supply circuit 10 comprises DC/DC transducer 12, for an input voltage is converted to desired various voltage of voltage regulation.For example, DC/DC transducer 12 can receive the voltage of 24 volts by the power converter 18 from Fig. 1, and provides the direct voltage of 2.9V, 3.0V, 3.3V, 5.0V or 12.0V for the various piece (as integrated circuit and disc driver) of notebook computer.The input power of DC/DC transducer 12, according to the availability of external power source and power converter 18, can obtain from power converter 18 or battery 14.When power supply obtains from the supply socket of family or office, power converter 18 is accepted DC power supply from supply socket, and provides DC power supply for transducer 12.
In the time cannot obtaining power easily from external power source, rechargeable battery 14 can provide interim power supply for DC/DC transducer 12 by blocking diode 16.Do not connect that time span that the portable electric appts of external power source can work determines by the capacity of battery 14.Finally, battery 14 possibly cannot provide enough power to DC/DC transducer 12 again, and must charge.
In common notebook computer, power circuit 10 comprises battery charger and DC/DC transducer 32, control circuit 34.DC/DC transducer 32 provides power supply for rechargeable battery 14.
Still, with reference to Fig. 3, current sense resistor 38, current sense amplifier 36, error amplifier 44 form a feedback loop, for controlling the charging current of battery 14.Current sense amplifier 36 provides and the proportional output current of voltage that detects resistance 38 two ends, and represents by the electric current of resistor 38 with this.A proportional control signal of difference between the reference level providing to output current and the reference voltage source 46 of current sense amplifier 36 is provided error amplifier 44.Based on above-mentioned control signal, the output of DC/DC transducer 32 is conditioned to control the charging current of battery 14.
For example, if charging current is too low, the voltage at resistance 38 two ends also will be very low, and the output current of current sense amplifier 36 is lower with respect to reference level, thereby the control signal of error amplifier 44 will cause DC/DC transducer 32 to export higher electric current.
Similarly, a feedback loop of combination composition of resistance 40 and 42, error amplifier 48, for monitoring and control the charging voltage of battery.The voltage that charging voltage feedback loop maintains node 41 equates with the magnitude of voltage of reference voltage source 46. Resistance 40 and 42 forms a voltage divider, makes the voltage of battery 14 and the value of reference voltage 46 roughly equal.Error amplifier 48 provides a control signal to DC/DC transducer 32, and this control signal depends on the difference of voltage and the reference voltage of node 41.This control signal is provided for DC/DC transducer 32, to keep required battery charging voltage.
According to principle of the present invention, the 3rd feedback loop is provided to detect the electric current from input power transducer 18.Current sense amplifier 54 provide one to by the proportional signal of electric current of current sense resistor 50.Error amplifier 52 provides a control signal to DC/DC transducer 32, and the difference between output voltage and the reference voltage source 46 of this control signal and current sense amplifier 54 is directly proportional.Therefore,, when the electric current by resistance 50 is too high, the output of current sense amplifier 54 is higher with respect to reference level.Thereby error amplifier 52 produces a control signal, makes DC/DC transducer 32 reduce charging current, thereby reduce the electric current drawing from power converter 18.The control signal phase mutual interference being provided by error amplifier 44,48 and 52 is provided diode 56,58 and 60, thereby makes the operation of the error amplifier control battery charging DC/DC transducer 32 with minimum output.
The output voltage of the 3rd feedback control loop regulating cell charging DC/DC transducer 32 and electric current are with the total current of restricted passage current sense resistor 50.For example, when the display of notebook computer is closed by computer power management system, system DC/DC transducer 12 provides lower power, and therefore more power can be used for the DC/DC transducer 32 of battery charger.But, when user presses the button on keyboard of notebook computer, notebook computer restarts its display system, and the increased power that now the DC/DC transducer 12 of system provides, causes the current limit that exceedes AC/DC transducer 18 by the electric current of current sensing resistor 50.Then input current feedback control loop makes the DC/DC transducer 32 of battery charger reduce battery charge, thereby has reduced the power demand of DC/DC transducer 32, and makes the electric current of being supplied with by power converter 18 in certain limit.
Fig. 4 A is the explanatory view of battery charger 20, comprises integrated circuit 70, and it is described in more detail in Fig. 4 B.Integrated circuit 70 comprises the DC/DC transducer of conventional current-mode switch, comprises trigger 74, switching circuit 76, shutdown and protective circuit 78.Switching circuit 76 combines with inductance 110, capacitor 112, diode 114, Schottky rectifier 116, capacitor 140 and 142, has formed " Bark " buck DC/DC power converter.This transducer is accepted DC power supply input ( pin 20,21 and 22 of integrated circuit is connected to Vcc), and provides DC voltage-stabilizing output at node 72.
Between battery charge period, the voltage of node 72 is conditioned, and makes electric current pass through current sense resistor 38 and charges for battery 14.Voltage drop on current sense resistor 38 is integrated circuit 70 and detects by its SENSE and BAT end ( pin 12 and 14). Resistance 78 and 80 forms SENSE and the BAT end of compensation bias current inflow integrated circuit 70, forms a part for current regulation loops simultaneously.
Referring now to Fig. 4 B, the SENSE of integrated circuit 70 and BAT end are connected to current sense amplifier 82.Transistor 84 and current sense amplifier 82 form a voltage-to-current amplifier, it is characterized in that, the collector current of the transistor 84 of flowing through determines by the voltage difference at sensing resistor 38 two ends, by current flowing, detect resistance 38(Fig. 4 A) electric current determine.The collector current of transistor 84 is the charging current of pilot cell therefore.
Current mirror 86 forms an electric current equating with the collector current of transistor 84, and the internal resistance 88 of flowing through.Suppose amplifier 118 and 120 output LOW voltages (being that integrated circuit 70 regulates charging current), by the electric current in resistance 88, all must flow out PROG(pin 19), and by programming resistors 89 and 90(Fig. 4 A).This causes voltage on error amplifier 94 inverting inputs to be proportional to the charging current of battery.
When the anti-phase input terminal voltage of amplifier 94 is during lower than its non-inverting input voltage, the voltage at node 92 places is lower than reference voltage, and error amplifier 94 is exported high level.On the contrary, when the voltage at node 92 places is during higher than reference voltage, error amplifier 94 output low levels.
The node 62 that error amplifier 94 is output as in Fig. 3 provides one to control voltage.A sawtooth waveforms is applied to the non-inverting input of comparator 106, with the voltage ratio at node 104 places after, at output output pulse width modulation (PWM) signal of amplifier 106.This pwm signal is coupled to trigger 74, with the operation of control switch circuit 76, thus the output voltage of adjusting DC/DC transducer, i.e. the voltage at node 72 places.
As an example, consider the situation of charging current lower than desirable value.Electric current lower than desirable value passes through the voltage sensing at resistance 38 two ends by sensed amplifier 82.Transistor 84 and current mirror 86 flow through internal resistance 88 and outside programming resistors 89 and 90 by producing a relatively low electric current.Because the electric current by resistance is relatively low, the voltage at internal node 92 places will be less than the reference voltage of non-inverting input of amplifier 94.
Because the voltage of node 92 is less than reference voltage, error amplifier 94, by a higher voltage of output, causes the voltage at node 104 places also to raise, thereby makes the non-inverting input voltage of voltage comparator 106 increase.The 200kHz reset pulse that this has postponed comparator 106 places, has increased the duty ratio of " unlatching ".The increase of " unlatching " duty ratio causes the output voltage of DC/DC transducer 32 to increase, thereby has increased the electric current of current flowing detection resistance 38.Similarly, too high charging current exceedes reference voltage by the voltage that causes node 92, reduces the output voltage of error amplifier 94, reduces by the electric current of sensing resistor 38.
According to description above, the clearly output (being node 72) of the circuit control DC/DC transducer 32 in Fig. 4 A and 4B, thus make voltage and the reference voltage at node 92 places roughly equal.The magnitude of voltage at node 92 places is functions that the summation of outside programming resistors 89 and 90 is multiplied by the electric current flowing through in current mirror 86.By using various programming resistors, target charging current value can be programmed into above-mentioned battery charger.
What equally, affect internal node 92 place's voltages is the output of feedback amplifier 118 and 120.In response to the relation between the reference voltage at its non-inverting input place and the overvoltage terminal of integrated circuit 70 (OVP, pin 8), feedback amplifier 118 provides extra electric current to flow to node 92.Non-essential resistance 40 and 42 forms a voltage divider, makes the required maximum voltage value of battery 14 approximate reference voltage.
For example, if the voltage of OVP terminal (being formed by resistance 40 and 42 dividing potential drops) exceedes reference voltage, error amplifier 118 provides extra electric current to node 92, the voltage at node 92 places is increased, thereby reduce the threshold voltage at node 104 places.Lower threshold voltage has reduced the delay of the PWM reset signal of being exported by comparator 106, causes the duty ratio of switching circuit 76 to reduce.Consequently the voltage at node 72 places will reduce, and similarly, the voltage at OVP place also will reduce.Therefore, amplifier 118 and its interlock circuit are for limiting voltage to one value being determined by resistance 40 and 42 that is applied to battery 14.
According to principle of the present invention, the 3rd feedback control loop comprises current sense resistor 50 and amplifier 120, according to the output of AC/DC power supply changeover device 18, regulates DC/DC converter 32.Amplifier 120 provides extra electric current to node 92 according to the output current of power converter 18.Above-mentioned output current is the voltage drop at current sense resistor 50 two ends by amplifier 120 sensings.If voltage drop exceedes the 100mV side-play amount that constant voltage source 122 provides, amplifier 120 will provide extra electric current to node 92 by diode 124.Therefore, the voltage at node 92 places will increase, and cause it to exceed the reference voltage of the non-inverting input of amplifier 94.Described in paragraph above, the voltage that improves node 92 places will cause the reduction of conducting duty ratio, thereby has reduced the power of DC/DC transducer 32.Therefore, the 3rd feedback control loop by-pass cock circuit 76, with the maximum current of power-limiting transducer 18.In order to adapt to different power converters, the value of resistance 50 can be selected, and makes the about 100mV of voltage drop at resistance 50 two ends when required electric current.
In general, the output (being node 72) that the battery charger 20 in Fig. 4 A and Fig. 4 B is DC/DC transducer 32 provides a stable voltage.Voltage-regulation is to realize by the conducting duty ratio of control switch circuit 76.Conducting duty ratio is determined by the voltage at the voltage at node 104 places, amplifier 94 and node 92 places.Conversely, the magnitude of voltage at node 92 places is functions of (1) amplifier 82 determined charging currents, (2) amplifier 118 determined cell voltages and (3) amplifier 120 determined power converter output currents.
The each circuit devcie being attached in Fig. 4 A and 4B provides various supporting and compensations.For example, transistor 126 provides a kind of method of enabling and forbidding charging circuit 20.The signal conduction transistor 126 at a CHG_ENABLE place, effective grounding makes the Vc end ground connection of integrated circuit 70.Because Vc terminal ground connection, so the voltage at node 104 places will can not exceed the voltage threshold that amplifier 108 arranges, so switching circuit 76 will keep closed condition.Same because of Vc terminal ground connection, electric capacity 96 and resistance 100 form a compensating network, for stablizing feedback control loop, thereby prevent control loop vibration.Fig. 4 A also comprises electric capacity 128,134,136 and 138, and they provide extra frequency compensation and filter function.
Although the present invention embodies by concrete example (portable notebook computer), above-mentioned example just should not limit the present invention for the present invention is described.It should be pointed out that as long as no departing from essence of the present invention and meeting the definition in claim, on above-mentioned example, make suitable modification and still belong to category of the present invention.For example, programming resistors 89 and 90, voltage- regulation resistance 40 and 42 can be replaced by or in conjunction with digital-analog convertor, to allow host microprocessors according to the battery 14 of design, electric current and voltage to be programmed.
Claims (9)
1. a battery charger for adjustable current, is characterized in that: comprise that one for the input from power supply received energy; One provides the output of energy for battery; Monitor the sensing circuit of at least one parameter; Be coupled to the regulating circuit of input, output and sensing circuit, it is according to voltage or the electric current of the parameter regulating cell charging circuit output of monitoring.
2. the battery charger of a kind of adjustable current according to claim 1, is characterized in that: above-mentioned regulating circuit is according to the value of predetermined battery charging voltage and electric current, and regulation output is to charging voltage and the electric current of battery.
3. the battery charger of a kind of adjustable current according to claim 1, is characterized in that: above-mentioned regulating circuit comprises the circuit for the voltage and current of regulation output end.
4. the battery charger of a kind of adjustable current according to claim 1, is characterized in that: at least one parameter is the output current of power supply; Above-mentioned predetermined value is the maximum current rated value of the power supply of.
5. the battery charger of a kind of adjustable current according to claim 1, is characterized in that: above-mentioned regulating circuit comprises at least one parameter of response, to guarantee that at least one parameter is no more than the circuit of predetermined limits value.
6. the battery charger of a kind of adjustable current according to claim 1, it is characterized in that: this circuit comprises a power converter, its input is coupled to the output of power supply, output is coupled to battery, and the electric energy that this power converter provides power supply is converted to for a kind of suitable form to battery charging; First feedback circuit is coupled to power converter, according to the voltage control power converter of power converter output; Second feedback circuit is also coupled to power converter, according to the Current Control power converter of power converter output; The 3rd feedback circuit is coupled to power supply and power converter, according to one or more predetermined parameter power ratio control transducers.
7. the battery charger of a kind of adjustable current according to claim 6, is characterized in that: above-mentioned predetermined multiple parameters comprise the electric current of power supply output.
8. the battery charger of a kind of adjustable current according to claim 7, is characterized in that: wherein the 3rd feedback circuit power ratio control transducer, is no more than predetermined value with the output current that guarantees power supply.
9. the battery charger of a kind of adjustable current according to claim 1, is characterized in that: this battery charger is for portable electric appts, and it comprises: first node is coupled to the outside of portable electric appts power supply; Second node is coupled to a battery; The 3rd node is coupled to above-mentioned first and second nodes; Battery charger comprises: feedback circuit is coupled to first node, according to the output parameter of power supply, provides a control signal; Regulating circuit is coupled to first, second node and feedback circuit, and for battery provides energy, this energy that is provided to battery is regulated by above-mentioned control signal.
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| CN201320763801.4U CN203562821U (en) | 2013-11-27 | 2013-11-27 | Current-adjustable battery charging circuit |
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| CN201320763801.4U CN203562821U (en) | 2013-11-27 | 2013-11-27 | Current-adjustable battery charging circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647334A (en) * | 2013-11-27 | 2014-03-19 | 苏州贝克微电子有限公司 | Current-adjustable battery charging circuit |
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| CN103647334A (en) * | 2013-11-27 | 2014-03-19 | 苏州贝克微电子有限公司 | Current-adjustable battery charging circuit |
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Address after: 215000 Building 1, No. 150, Jici Road, science and Technology City, high tech Zone, Suzhou City, Jiangsu Province Patentee after: Suzhou Baker Microelectronics Co.,Ltd. Address before: Room 1404, building 3, No. 209, Zhuyuan Road, high tech Zone, Suzhou, Jiangsu 215011 Patentee before: SUZHOU BAKER MICROELECTRONICS Co.,Ltd. |
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Granted publication date: 20140423 |