CN1578049A - Electric power management circuit - Google Patents
Electric power management circuit Download PDFInfo
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- CN1578049A CN1578049A CNA2004100638004A CN200410063800A CN1578049A CN 1578049 A CN1578049 A CN 1578049A CN A2004100638004 A CNA2004100638004 A CN A2004100638004A CN 200410063800 A CN200410063800 A CN 200410063800A CN 1578049 A CN1578049 A CN 1578049A
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 44
- 238000006243 chemical reaction Methods 0.000 claims description 13
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
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- 229910001416 lithium ion Inorganic materials 0.000 description 5
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- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
Provided is a circuit for controlling a charging parameter provided to rechargeable batteries. The circuit comprises a circuit, for controlling power, that is configured so as to provide a power control signal indicative of a power output level of a DC source; and a circuit for generating a control signal that is configured so as to decrease the charging parameter given to a battery, if the power output level exceeds a specified power threshold level. An electronic device, having such a circuit and method, is also provided. The circuit can be used, together with the DC source which provides power for charging rechargeable batteries. The DC source may have an output voltage level which is not constant, such as one from a controllable DC source or a variable DC source.
Description
Technical field
The present invention relates to a kind of power-supply system of electronic equipment, relate to the electric power management circuit that a kind of monitoring and restriction offer the output power stage of rechargeable battery more specifically.
Summary of the invention
The invention provides the circuit that a kind of control offers the charge parameter of rechargeable battery, described circuit comprises: the power control circuit that the power control signal of representing a DC output power of power supply value is provided; With one when described power output valve exceeds a predetermined power threshold value, be used to reduce offer the control signal generation circuit of the described charge parameter of described battery.
The invention provides a kind of electronic equipment, this electronic equipment comprises that a control offers the circuit of the charge parameter of rechargeable battery, and described circuit comprises: the power control circuit that the power control signal of the output power value of representing a DC power supply is provided; With one when described output power value exceeds the predetermined electric power threshold value, reduce the control signal generation circuit of the described charge parameter offer described battery.
The invention provides a kind of method and comprise step: an output power value of a DC power supply of monitoring; Described output power value and a threshold power value are made comparisons; When exceeding described threshold power value, reduces described output power value the charge parameter that offers rechargeable battery.
The invention provides a kind of control circuit comprises: an on-site judgment circuit, this on-site judgment circuit will have one fixedly the DC power source voltage value and the selectable voltage threshold value of output voltage values make comparisons, the described DC power supply of a representative on-site judgment signal on the throne is provided when described magnitude of voltage exceeds described optional threshold voltage; With a control signal generation circuit, this control signal generation circuit receives described at least on-site judgment signal and further provides a control signal with the described at least on-site judgment signal of response.
The invention provides a kind of electronic equipment, this electronic equipment comprises a kind of circuit, described circuit comprises: an on-site judgment circuit, this on-site judgment circuit will have one fixedly the DC power source voltage value and the selectable voltage threshold value of output voltage values make comparisons, the described DC power supply of a representative on-site judgment signal on the throne is provided when described magnitude of voltage exceeds described optional threshold voltage; With a control signal generation circuit, this control signal generation circuit receives described at least on-site judgment signal and further provides a control signal with the described at least on-site judgment signal of response.
The invention provides a kind of method and comprise step: choose a threshold voltage; Fixedly the output voltage values and the described threshold voltage of DC power supply are made comparisons with one; The described fixedly DC power supply of a representative on-site judgment signal on the throne when exceeding described threshold voltage, described output voltage values is provided.
Though those skilled in the art will appreciate that to the following specifically describes as preferred embodiment and method that the present invention is not limited to these preferred embodiments and method.Opposite, the present invention is with a wide range of applications, and only is subject to appended claims.
Description of drawings
Other characteristic of the present invention and advantage will the following specifically describes and in conjunction with illustrated explanation in more obvious, wherein same numbers is represented similar elements, and wherein:
Figure 1 shows that the block diagram of exemplary batter-charghing system of the present invention;
Figure 2 shows that exemplary amplifying circuit of the present invention;
Figure 3 shows that oscillator signal and DC signal produce the sequential chart of pwm signal among Fig. 1;
Fig. 4 A is depicted as the block diagram of the electronic equipment with electric power management circuit of another embodiment, and wherein electric power management circuit provides a control signal for controlled DC power supply;
Fig. 4 B is depicted as the block diagram of another electronic equipment with electric power management circuit of Fig. 4 A, and wherein electric power management circuit provides a control signal for the DC/DC transducer;
Fig. 5 A is depicted as the detailed diagram that produces the control signal circuit part in the electric power management circuit of Fig. 4 A;
Fig. 5 B is depicted as the detailed diagram that produces the control signal circuit part in the electric power management circuit of Fig. 4 B;
Figure 6 shows that the detailed diagram of power control circuit part in the electric power management circuit of Fig. 5 A and Fig. 5 B;
Figure 7 shows that various signals and time relation figure among Fig. 6;
Figure 8 shows that the exemplary circuit diagram of an embodiment of electric power management circuit among Fig. 6;
Figure 9 shows that the DC power supply of a fixed voltage output of employing and the block diagram of the electronic equipment of on-site judgment circuit with comparison DC supply voltage and selectable voltage thresholding;
Figure 10 A and 10B are depicted as the block diagram of one exemplary embodiment of the selectable voltage thresholding of on-site judgment circuit among Fig. 9.
Embodiment
Figure 1 shows that voltage mode battery charger system 10 according to an embodiment.System 10 comprises a voltage mode battery charger circuit 12 that adopts DC power supply 14 to give one or more battery 16 chargings.The DC power supply can be an AC/DC adapter or other power supply units.Circuit 12 is by the duty ratio of switch 20 control buck converter (Buck converter) circuit 18 (comprising an inductance well known in the art and an electric capacity), thereby control offers the charge capacity of battery 16.Generally, circuit 12 is by the duty ratio of monitoring power supply electric current, battery charge (under the current-mode) and cell voltage (under the voltage mode) control buck converter 18.Detect battery charge by sensing resistor (or impedance) Rsch.The present invention adopts the voltage topological structure, detects the flow through electric current (adopting the method at conventional current pattern topological structure) of inductance of electric current on the Rsch rather than detection.According to the method, by adopting battery circuit control and voltage control simultaneously, the present invention can charge the battery when stopping near battery charge cycle more accurately, compares with conventional current pattern charging topological structure, grasps the charging termination time more accurately.Below will be described in detail system 10.
In fact, charger circuit 12 is controlled the duty ratio of buck converter 18 by the power of control compensation capacitor C comp38.Circuit 12 comprises: a battery current control section of being made up of sensing amplifier 26 and trsanscondutance amplifier 28, a cell voltage control section and a power control section branch of forming by sensing amplifier 34 and trsanscondutance amplifier 36 of forming by sum unit 30 and trsanscondutance amplifier 32.Battery current control section and cell voltage control section produce the signal of representing battery current and cell voltage respectively.Power control section is divided the signal of generation representative from power supply 14 obtainable power.These parts link to each other at node 60 places, if wherein any one part exceeds a threshold value, the power that offers charging capacitor just will reduce, thereby reduce the duty ratio of buck converter.Below will be described in detail this operation.
The duty ratio of buck converter 18 is controlled by switch 20 by comparator 40.Comparator 40 be input as the sawtooth signal that voltage on the building-out capacitor (Ccomp) 38 and oscillator 44 produce.Comparator 40 is output as a pulse-width modulation (PWM) signal 68, and the pulsewidth of this signal (duty ratio) obtains by the joining that Ccomp38 goes up voltage signal amplitude and sawtooth signal amplitude.Adopt this method for sensing, the duty ratio of pwm signal will be based on voltage on the building-out capacitor 38 and the sawtooth signal that is produced by oscillator 44.Said here " based on " should be interpreted as " be and so on function " or " relevant " widely with what.Voltage magnitude on the Ccomp is big more, and the duty ratio of pwm signal 68 is just big more.In an exemplary embodiment, sawtooth signal is the signal of a fixed-frequency, therefore can adjust the duty ratio of PWM by the voltage magnitude on the adjustment Ccomp38.Ccomp38 is by current source 42 chargings.If any part that Current Control part, voltage control part or power control section are divided is not all sent signal, current source just charges to Ccomp to greatest extent, at this moment, the duty ratio maximum of PWM, and buck converter is also maximum to charging current and charging voltage that battery provides.The signal that any part that Current Control part, voltage control part or power control section are divided is sent all will be an attenuation factor for building-out capacitor 38, thereby reduce the voltage on the building-out capacitor, and reduce the duty ratio of pwm signal thus.In such a way, the charging current that offers battery 16 can be controlled.The detail of buck converter 18 and switch 20 all is known in the art, not critical to the present invention, and can be extended to controllable DC/DC converter circuit.
Current Control
Current Control part (circuit) comprises a sensing amplifier 26 and a trsanscondutance amplifier 28.The sensing amplifier monitoring flow is through the battery charge of sensing impedance Rsch 24, and send one with the proportional signal of battery charge.Trsanscondutance amplifier 28 receives the output of sensing amplifier 26, and this output signal is compared with (expectation) battery current signal Ich that has programmed.Usually, the input of trsanscondutance amplifier 28 is voltage signals, and output is corresponding proportional current signal.The output of trsanscondutance amplifier is current controling signal 62, and this current controling signal is proportional with the battery charge amount that exceeds programming signal Ich.Ich was zero exceed the current value I ch that has programmed in battery charge before.The value of Ich of having programmed is to be provided with according to concrete battery size and demand, and is for example well known in the art, and the Ich value is set when giving the standard lithium ion battery charge.
If battery charge exceeds threshold value Ich, amplifier 28 sends the current controling signal 62 of a corresponding proportion.Because the output (at node 60) of amplifier links to each other with the negative pole of current source 42, any signal that amplifier 28 sends all will weaken the electric current of current source 42.Then, this operation will reduce the voltage on the Ccomp38, thereby reduce the duty ratio of pwm signal 68, and reduce to offer the charging current of battery.Because output current control signal 62 is directly proportional with input value, so duty ratio can dynamically be adjusted as the function of battery charge.
Voltage control
Voltage control part (circuit) comprises sum unit 30 and a trsanscondutance amplifier 32.In an exemplary embodiment, sum unit comprises three inputs: high precision reference voltage or calibration voltage Ref signal, voltage setting (Vset) signal and a voltage correction (Vcor) signal.In an exemplary embodiment, battery 16 is lithium ion batteries.Lithium ion battery is very responsive to over-voltage condition, and if overcharge will danger close.Therefore, reference signal or calibrating signal Ref will be accurate in the margin of tolerance of battery permission.For lithium ion battery, permissible error+/-0.5% in.Yet the battery of other types and reference voltage require equally in this consideration.Vset represents the voltage value of setting, is provided by battery manufacturers usually.Vcor is a corrected signal that is directly proportional with charging current, as the compensating signal of charging device and the dead resistance relevant with battery (owing to can't directly measure cell voltage, therefore must dependence dead resistance).Vcor can obtain by voltage divider with the output-parallel of sensing amplifier 26 of tap.These three signals are sued for peace in sum unit 30 with the form of weighting.For example, the output of sum unit 30 can be set to: reference voltage+(Vset/x)+Vcor/y); Wherein x and y choose according to the voltage value of setting and the electric current value of setting of expectation respectively.Vcor and Vset needn't be the same with reference voltage accurate, because will be divided by x and y, its proportion be just corresponding less.
Usually be regarded as predefined cell voltage threshold signal from the weighted voltage signal of sum unit 30 outputs.Trsanscondutance amplifier 32 is compared the output of sum unit with cell voltage.Amplifier 32 is output as a voltage control signal 64, and the cell voltage amount of the threshold value that this voltage control signal is definite with exceeding sum unit is directly proportional.As described in dividing as the front current control division, if cell voltage exceeds the threshold value that sum unit is determined, 64 of signals are non-vanishing.Because the output (at node 60) of amplifier 32 is connected with the negative pole of current source 42, any signal 64 that amplifier 32 sends all will weaken the electric current of current source 42.Then, this operation will reduce the voltage on the Ccomp38, thereby reduce the duty ratio of pwm signal 68, and reduce to offer the charging current of battery.Because the output signal 64 of amplifier 32 is directly proportional with input value, so duty ratio can dynamically be adjusted to reach the cell voltage of expectation.
Power control
Power control section branch (circuit) comprises a sensing amplifier 34 and a trsanscondutance amplifier 36.The power control section branch is used to reduce the duty ratio of buck converter, thereby the active system 72 (for example portable electric appts) that need link to each other to power supply at the DC power supply reduces to offer the charging current of battery when providing more high-power.This active system is in parallel with the charging system 10 on being connected across sensing resistor Rsac.Because the gross power that power supply 14 is provided is constant, so in a design perfect system, the loading demand of active system and battery charger is a balance.The power control section branch satisfies the demand of active system by reducing charging current, thereby guarantees that active system (aspect power demand) enjoys priority.Therefore, power control section divides generation a power control signal 66, and this power control signal is directly proportional with the amount that battery charger and active system power demand exceed thresholding Iac_lim.Iac_lim is power supply 14 available maximums normally.For example, power supply 14 can be given an active system (not shown) power supply simultaneously and provide charging current to battery.If this portable system needs more power, then the charging current of battery correspondingly reduces to guarantee the demand of this system.Power supply 14 is normally defined the DC power supply, and it can be powered by the AC/DC adapter.Because the output voltage values that DC power supply 14 provides is constant, just be enough to limit the power of DC power supply by the electric current output of monitoring and restriction DC power supply.
If battery charger and activity system power demand exceed threshold value Iac_lim, 36 in amplifier sends the power control signal 66 of a corresponding proportion.Because the output (at node 60) of amplifier links to each other with the negative pole of current source 42, so any signal that amplifier 36 sends all will weaken the electric current of current source.Then, this process will reduce the voltage on the Ccomp38, thereby reduce the duty ratio of pwm signal 68, and reduce to offer the charging current of battery.Because the output signal 66 of amplifier 36 is directly proportional with input value, thus duty ratio can dynamically be adjusted as a function of balance sysmte and battery power demand between the two, thereby make DC power supply 14 can not surpass peak power output.
Figure 3 shows that voltage vcc omp on explanation pwm signal 68 (figure below) and the building-out capacitor and sequential Figure 70 of sawtooth signal 44 crossing (last figure).In this one exemplary embodiment, Vccomp comes down to a DC signal, and the amplitude of this signal is heightened by current source 42, turns down by current controling signal 62, voltage control signal 64 or power control signal 66.In other words, the value of Vccomp (amplitude) is signal (42-(62,64 and/or 66)) sum.By moving down the value of Vccomp, the duty ratio of pwm signal will reduce.
Therefore, adopt the present invention, the duty ratio of pwm signal can be adjusted by a difference building-out capacitor.In an exemplary embodiment, PWM can be used as the required function of battery charge, cell voltage and/or system power and is dynamically adjusted.Topological structure shown in Figure 1 is a voltage mode topological structure.The voltage mode topological structure means that sensing resistor Rsch places the outside of buck converter, and therefore, the electric current of this resistance of flowing through is a DC value (non-ripple).
In another embodiment, as described below, can adopt electric power management circuit 12a control to offer the charge power grade of rechargeable battery 16.For realizing this function, can adopt electric power management circuit 12a directly a control controlled DC power supply (Fig. 4 A) or a DC/DC transducer (Fig. 4 B), wherein the associated DC power supply among each embodiment possibly can't provide a fixing output voltage values.
Fig. 4 A is depicted as the electronic equipment 400 with electric power management circuit 12a of the present invention, and this electric power management circuit control offers the battery charge parameter of rechargeable battery, for example, and battery charge and/or voltage.In the embodiment of Fig. 4 A, realize this function by the power output grade of controlling controlled DC power supply 404.Electronic equipment 400 can be to comprise this type of any electronic equipment of notebook computer, mobile phone, personal digital assistant.Employing is given system 72, battery 16 power supplies from the electric energy of controlled DC power supply 404 with various modes or is powered to them simultaneously.Battery 16 comprises one or more batteries.Battery 16 can be the rechargeable battery as kinds such as lithium ion battery, nickel-cadmium cell, Ni-MH batteries.
Controlled DC power supply 404 can be the power supply of any kind of well known in the art, for example, and a controlled AC/DC adapter that receives ac input voltage and a controlled DC output is provided according to an appropriate control signals.Control signal can 421 be sent along the path by electric power management circuit 12a.Path 421 from electric power management circuit 12a to controlled DC power supply 404 can be an independent pathway that uses any communications protocol known in the field.For example, the controlled DC power supply 404 configurable serial communication interfaces (as RS232) that a reception is arranged from the serial control signal of electric power management circuit 12a.In addition, the also configurable analog interface that an analog control signal of a reception is arranged of controlled DC power supply 404.So just do not need independent pathway 421.For example, the control signal from electric power management circuit 12a can be modulated on the power line 25.In this case, electric power management circuit 12a and controlled DC power supply 404 all are equipped with modulating/demodulating circuit known in the field, so that be created in the feedback control signal of transmission on the power line 25.
Electric power management circuit 12a comprises a power control circuit 471 and a control signal generation circuit 473.Usually, power control circuit 471 provides the power control signal of the controlled DC power supply 404 power output grades of representative for control signal generation circuit 473.Control signal generation circuit 473 comprises multiple error amplifier, is used for signal (for example, power control signal) and the associated gate limit value that is provided with for each monitored parameter are made comparisons.Be similar to the circuit 12 among Fig. 1 of detailed earlier herein.For example, error amplifier can be arranged in simulation " line or " topological structure, and like this, at first detecting the error amplifier that relevant maximum threshold situation occurs exceeding will be to controlled adapter 404 command signal.Then, appropriate control signals is transmitted to controlled DC power supply 404, for example, when reaching a max threshold, is used to reduce a power output parameter.
Fig. 4 B is depicted as another one exemplary embodiment of the electronic equipment 400a with electric power management circuit 12a of the present invention, this electric power management circuit is used for controlling the battery charge parameter, for example, by control DC/DC transducer 18 control battery charge and/or battery charging voltages.DC power supply 406 provides rechargeable electrical energy by DC/DC transducer 18 to battery.The output voltage values of DC power supply 406 can change in time.For example, DC power supply 406 is sun-generated electric powers, the light that its output voltage values receives along with power supply what and change.The DC power supply also may be a fuel cell.The fixedly output voltage values that DC power supply 406 provides may be different with the magnitude of voltage that system is expected.For example, it is 15 volts power supply that the user of electronic equipment 400a uses fixing output voltage values, and the expectation power supply of electronic equipment 400a is 20 volts.As the preferred embodiments of the present invention, under the situation that is no more than this power supply maximum output current, the DC that electric power management circuit 12 changes this output voltage values can provide maximum power.
Control signal generation circuit 473 sends a control signal for DC/DC transducer 18.This control signal can be a foregoing pwm signal 68, and this DC/DC transducer 18 can be any DC/DC transducer known in the art.Description among other elements of Fig. 4 B and operation and the prior figures 4A is similar.Therefore, the similar circuit element numbers also is similarly to mark.For simplicity's sake, just be not repeated in this description similar elements or operation here.
Fig. 5 A is depicted as the exemplary circuit diagram of the embodiment of electric power management circuit 12a, has described the details of control signal generation circuit 473 among the figure.Control signal generation circuit 473 comprises and being used for various signals and associated gate limit value multiple error amplifier 36,472,28 and 32 relatively.Here, the class of operation of the circuit of describing in the various elements of control signal generation circuit 473 and operation and the prior figures 1 12 seemingly.Therefore, the similar circuit element numbers also is similarly to mark.For simplicity's sake, just be not repeated in this description similar elements or operation here.
Because the output of controlled DC power supply 404 is Protean, so control signal generation circuit 473 can comprise a current limliting error amplifier 36 and a Power Limitation error amplifier 472 simultaneously.This current limliting error amplifier 36 is compared the signal of controlled DC power supply 404 output currents of representative with a threshold Iac_lim.Power Limitation error amplifier 472 is compared the signal of controlled DC power supply 404 power outputs of representative with a power threshold.When the output current of power supply reaches the threshold value or power output reaches power threshold, the duty ratio of the pwm control signal that provided by comparator 40 just will be provided control signal generation circuit 473.At this moment, thus controlled DC power supply 404 response pwm control signals reduce its power output.Certainly, comparator also can be replaced by other circuit, as long as this circuit can with the voltage on the building-out capacitor 38 with make comparisons from the sawtooth signal of oscillator 44, and can provide the control signal (as, analog or digital signal) of any kind of the output voltage of the controlled DC power supply of control.
Fig. 5 B is depicted as another embodiment of Fig. 4 B, and wherein electric power management circuit 12a provides a control signal to offer the charge parameter of rechargeable battery 16 with control for DC/DC transducer 18.The output voltage values of DC power supply 406 may change in time, as the specific descriptions among the prior figures 4B.Control signal can be a foregoing pwm signal, and DC/DC transducer 18 also can be the DC/DC transducer of any kind known in the field.Description among other elements of Fig. 5 B and operation and the prior figures 5A is similar.Therefore, the similar circuit element numbers also is similarly to mark.For simplicity's sake, just be not repeated in this description similar elements or operation here.
Figure 6 shows that the concrete block diagram of exemplary power control circuit 471 and circuit for power conversion 577 among Fig. 5 A and Fig. 5 B.This circuit provides current signal for the error amplifier 36 in the control signal generation circuit 473, power signal is provided for error amplifier 472.Circuit for power conversion 577 comprises the standard configuration of analog or digital multiplier topological structure.Yet in order to reach the accuracy of expectation, these methods also need to be repaired.Circuit for power conversion 577 can also comprise an oblique wave oscillator 608, comparator 610, a multiplier 612 and a filter 614, will specifically describe below.
Usually, power control circuit 471 comprises sensing amplifier 34, and this sensing amplifier is monitored the pressure drop on sensing resistor 22 and an IAD signal offered the in-phase input end of comparator 610.The IAD signal can be the dc voltage signal of a representative from DC power supply 404 or 406 electric currents.Then, the sawtooth signal of fixed-frequency will be offered the inverting input of comparator 610 by oblique wave oscillator 608.The output of the oblique wave oscillator 44 in the control signal generation circuit 473 also can provide this signal to comparator 610.Like this, comparator 610 just provides an adapter electric current pulse-width signal IAD_PWM, and wherein signal pulsewidth or duty ratio are based on the IAD signal value.
Multiplier 612 is with IAD_PWM and represent the VAD signal multiplication of the output voltage values of power supply 404 or 406, thereby obtains a power_PWM signal.The power_PWM signal can be one to have and represents the output of DC power supply 404 or 406 electric currents and have the pulse-width signal of represent DC power supply 404 or 406 voltages to export.So, the power_PWM signal is just represented the instantaneous output of DC power supply 404 or 406.Then, the power_PWM signal is input to filter 614, then power signal with dc voltage value of filter output.Then offer the error amplifier 472 of control signal generation circuit 473 from this power signal of filter 614 outputs.If the instantaneous output value rises and surpasses the predetermined electric power threshold value, error amplifier 472 just makes comparator 40 provide a pwm signal to reduce to offer the charge parameter of battery.This pwm signal can offer controlled DC power supply 404 or DC/DC transducer 18.
Figure 7 shows that the sequential chart of various signals, further explained the power control circuit 471 of Fig. 6.Figure 70 8 shows two input signals that comparator 610 receives, or perhaps IAD signal 711 and sawtooth signal 714.Sawtooth signal 714 can be the signal of a fixed-frequency, and the joining of sawtooth signal 714 and IAD signal 711 has just defined the pulsewidth or the duty ratio of synthetic IAD_PWM signal 716 like this.For example, the time interval of t1 time and t2 time is represented one-period.IAD_PWM signal 716 is " 0 " in the time in t1 time and t2, is " 1 " in the time in t2 time and t3.Therefore, the time interval of t2 time and t3 time has defined pulsewidth or the title duty ratio from the IAD_PWM signal 716 of comparator 610.
In curve chart 708,, synthesize the just increase of pulsewidth of IAD_PWM signal 716 when IAD signal 711 position from figure is moved.Similarly, move when IAD signal 711 deposits from the figure meta, the pulsewidth of synthetic IAD_PWM signal 716 just reduces.The amplitude of IAD_PWM signal 716 is fixed value x.
Then, IAD_PWM signal 716 be input to multiplier 612 and with the VAD signal multiplication of the output voltage values of representing power supply 404 or 406.So just obtain the output signal of multiplier 612 or claim power_PWM signal 718.Therefore power_PWM signal 718 has the pulsewidth of controlled adapter 404 current output value of representative and the amplitude y of controlled matching device 404 voltage output values of representative.Then, power_PWM signal 718 is input to filter 614 so that the power signal 720 with constant DC performance number to be provided.This power signal also can be imported into control signal generation circuit 473, for example, is input to the error amplifier 472 of circuit 473.
Figure 8 shows that the physical circuit figure of an one exemplary embodiment of the electric power management circuit 12a of Fig. 4 A, Fig. 4 B, Fig. 5 A, Fig. 5 B, Fig. 6 and Fig. 7.The component labelling of describing in the element of Fig. 8 and the prior figures 6 is similar.For simplicity's sake, just be not repeated in this description this element here.
Voltage sampling circuit 807 can comprise a pair of resistance R 3, R4, forms a voltage divider, thereby with the scaled of the output voltage of controlled adapter and offer the in-phase input end of operational amplifier 1a.The output of operational amplifier 1a feeds back to inverting input.Those skilled in the art will appreciate that and to adopt the multiple voltage sample circuit that the VAD signal is offered multiplier 612.
Multiplier 612 can be a power buffer, effectively the amplitude of IAD_PWM input signal is converted to the amplitude of the controlled adaptor voltages value of representative.Like this, the output in power buffer just obtains the power_PWM signal.Filter 614 can be a RC filter.It is made up of with the resistance between the node 814 and a capacitor C F who is connected between node 814 and the ground an input that is connected in filter.The RC filter receives the power_PWM input signal and the power output signal with dc voltage value of representing DC output power of power supply value is provided.
Figure 9 shows that another embodiment of electric power management circuit 12b.Electric power management circuit 12b comprises an on-site judgment circuit 903, is used for the magnitude of voltage and the selectable voltage threshold value of DC power supply 902 are made comparisons, and will describe in detail below.Like this, single electric power management circuit 12b just can use the multiple DC power supply 902 with corresponding a plurality of fixedly output voltage values.
Usually, electric power management circuit 12b comprises a control signal generation circuit 905 and an on-site judgment circuit 903.Control signal generation circuit 905 comprises the multiple error amplifier in the circuit 916, is used for the associated gate limit value of signal and each monitoring parameter is made comparisons, and is similar to the specific descriptions of circuit 12 in the prior figures 1.For example, a plurality of error amplifiers can be configured to simulation " line or " topological structure, so at first detect the be correlated with error amplifier of maximum threshold situation to occur exceeding and control is offered the command signal of DC/DC transducer 904.Control signal generation circuit can comprise PWM circuit 915, is similar to the circuit 12 of pwm control signal to be provided among Fig. 1 DC/DC transducer 904.For example, relevant maximum threshold situation occurs exceeding if one of them error amplifier detects, the duty ratio that reduces pwm control signal just can reduce a power output parameter of DC/DC transducer 904.
Control signal generation circuit 905 can also comprise selector circuit known in the art in the circuit 916, be used to provide a selector control signal, this control signal is according to various monitor states and/or at least can control switch SW1, SW3 and the state of SW4 from the order of host power supply administrative unit (PMU) 912.
Usually, on-site judgment circuit 903 compares magnitude of voltage and a selectable voltage threshold value of DC power supply 902.DC power supply 902 can provide a fixedly DC power supply of any kind of output voltage values, for example, the fixedly ACDC adapter of DC output voltage is arranged.Can adopt a plurality of DC power supplys that relevant a plurality of fixedly output dc voltage values are provided.For example, an ACDC adapter provides 15 volts of DC outputs, and another ACDC adapter provides 20 volts of DC output.Voltage threshold V_SEL according to the expectation of DC power supply 902 fixedly output voltage values select.Selected voltage threshold V_SEL is normally less than the standard value of desired output magnitude of voltage.Therefore, if the DC power supply exists, and this DC power supply provides a magnitude of voltage that meets the requirement of expectation fixed voltage value, and compare operation just provides the signal of this situation of expression.
For carrying out this compare operation, on-site judgment circuit 903 comprises a comparator 931, and this comparator receives a voltage signal V_DC who represents DC power supply 902 magnitudes of voltage at its in-phase input end.Comparator 931 receives selectable voltage threshold value V_SEL at its inverting input.If DC power source voltage value exceeds selected threshold value, comparator then offers control signal generation circuit 905 with an one-output signal, shows that the output voltage that exists DC power supply and DC power supply to provide meets the requirements.
Can select the selectable voltage threshold value in several ways and provide it to comparator 931.For example, optional threshold voltage circuit 932 can provide optional threshold voltage.Among Figure 10 A, optional threshold voltage circuit 932 comprises a resistor network 1004 that receives a reference voltage level V_REF and selected voltage threshold V_SEL is provided.Resistor network 1004 comprises one or more resistance of arranging by method well known in the art, for example, and for reaching desired value or selected threshold voltage is arranged in potential-divider network.In addition, resistor network 1004 comprises the adjustable resistance element of at least one adjustable to the expectation resistance.Resistive element can adopt several different methods well known in the art to calibrate (for example, laser calibration), combines with the reference voltage V_REF that receives by resistor network 1004 like this, and an expectation threshold voltage just can be provided.
In addition, optional threshold voltage circuit 932 can comprise a memory element 1006, shown in Figure 10 B.Memory element 1006 can be any kind memory element of storing digital information, for example, random asccess memory (RAM), programmable read-only memory (prom), EPROM (Erasable Programmable Read Only Memory) (EPROM), EEPROM (Electrically Erasable Programmable Read Only Memo) (EEPROM), dynamic random access memory (DRAM), disk (as floppy disk and hard disk) and CD (as CD-ROM) also are not limited thereto certainly.Memory element 1006 can be disposable programmable memory or time-after-time programmable memory, and this depends on the memory element type of employing and the access mode of memory element when programming again.In case the digital signal of expression expectation simulation threshold voltage program storage then can adopt digital to analog converter (DAC) 1008 digital signal of storage to be converted to the analog voltage signal of the selected voltage threshold V_SEL of representative in memory element.
In addition, can also send indication for electric power management circuit 12b by host bus 980, thereby select selected voltage threshold V_SEL by main frame PMU 912.The host interface 913 of electric power management circuit 12b offers selectable voltage threshold circuit 932 by internal signal bus 982 with signal, expects that like this threshold value just can carry out dynamic programming by main frame PMU 912.
Thereby, provide a circuit to offer a charge parameter of rechargeable battery with control here.This circuit comprises a power control circuit, the power control signal that provides one to represent DC power output valve is provided, with a control signal generation circuit, be used for when the power output valve exceeds a predetermined power threshold value, reducing to offer the charge parameter of battery.
Another circuit that provides comprises an on-site judgment circuit, be used for having one fixedly the DC power source voltage value of output voltage values compare with the selectable voltage threshold value, and if magnitude of voltage an expression DC power supply signal on the throne on the throne is provided when exceeding the selectable voltage threshold value.This circuit also comprises a control signal generation circuit, and this control signal generation circuit receives and responds this signal on the throne at least and further sends a control signal.
Those skilled in the art will be appreciated that many modifications of the present invention.Conspicuous for those skilled in the art modification and other modifications all are regarded as comprising within the spirit and scope of the present invention, and the present invention only is subject to appended claims.
Claims (42)
1. a control offers the circuit of the charge parameter of rechargeable battery, and described circuit comprises:
The power control circuit that the power control signal of representing a DC output power of power supply value is provided; With
One when described power output valve exceeds a predetermined power threshold value, be used to reduce offer the control signal generation circuit of the described charge parameter of described battery.
2. circuit according to claim 1, it is characterized in that: described circuit further comprises a current control circuit that the current controling signal of representing a DC source current output valve is provided, on behalf of the threshold signal of threshold value, described control signal generation circuit further compare with one described current controling signal, when described current output value exceeded described threshold value, described control signal generation circuit was further used for reducing the described charge parameter that offers described battery.
3. circuit according to claim 1 is characterized in that: described power control circuit comprises:
First path that first signal of the described DC electric power outputting current value of representative is provided;
Second path that the secondary signal of the described DC electric power output voltage value of representative is provided; With
A circuit for power conversion, this circuit for power conversion receive described first and second signals and provide described power control signal to respond described first and second signals.
4. circuit according to claim 3, it is characterized in that: described circuit for power conversion comprises a multiplier that connects described first path and second path, described multiplier receives described first signal and described secondary signal and one the 3rd signal is provided, described the 3rd signal is based on the product of described first signal and described secondary signal, and wherein said power control signal is based on described the 3rd signal.
5. circuit according to claim 4, it is characterized in that: described first signal comprises an electric current pulse-width signal, this electric current pulse-width signal has the pulsewidth of the described current value of a described DC power supply of representative, described secondary signal comprises a dc voltage signal, this dc voltage signal has the dc voltage value of the described output voltage values of a described DC power supply of representative, wherein said multiplier provides the 3rd signal, and described the 3rd signal is the pulse-width signal that has the pulsewidth of a described output current value of representative and represent the amplitude of described output voltage values.
6. circuit according to claim 4 is characterized in that: described first path comprises:
The sensing amplifier of voltage signal that the described output current value of a described DC power supply of representative is provided; With
A comparator that receives a sawtooth signal and the described voltage signal of the described output current value of the described DC power supply of representative, described comparator provides described electric current pulse-width signal, and described electric current pulse-width signal has a pulsewidth based on the joining of described sawtooth signal and described voltage signal.
7. circuit according to claim 6, it is characterized in that: described comparator provides described electric current pulse width signal, described electric current pulse width signal has first pulsewidth at the described voltage signal of the described current value of the first estate response representative, wherein said comparator provides described electric current pulse-width signal, described electric current pulse-width signal has second pulsewidth at the described voltage signal of the described current value of second grade response representative, wherein if described the first estate during greater than described second grade described first pulsewidth greater than described second pulsewidth.
8. circuit according to claim 5 is characterized in that: described circuit for power conversion comprises a filter that receives described the 3rd signal and described power signal is provided.
9. circuit according to claim 8 is characterized in that: described filter comprises a RC circuit.
10. one comprises that a control offers the electronic equipment of circuit of the charge parameter of rechargeable battery, and described circuit comprises:
The power control circuit that the power control signal of the output power value of representing a DC power supply is provided; With
One when described output power value exceeds the predetermined electric power threshold value, reduce the control signal generation circuit of the described charge parameter offer described battery.
11. electronic equipment according to claim 10, it is characterized in that: described circuit further comprises a current control circuit that the current controling signal of the described DC electric power outputting current value of representative is provided, described control signal generation circuit is further used for representing the threshold signal of threshold value to make comparisons described circuit control signal and one, described control signal generation circuit is further used for reducing to offer the described charge parameter of described battery when described output current value exceeds described threshold value.
12. electronic equipment according to claim 10 is characterized in that: described power Control current comprises:
First path that first signal of the described DC electric power outputting current value of representative is provided;
Second path that the secondary signal of the described DC electric power output voltage value of representative is provided; With
A kind of circuit for power conversion, this circuit for power conversion receive described first signal and described secondary signal and provide described power control signal to respond described first signal and secondary signal.
13. electronic equipment according to claim 12, it is characterized in that: described circuit for power conversion comprises a multiplier that connects described first path and described second path, described multiplier receives described first signal and described secondary signal and one the 3rd signal is provided, described the 3rd signal is based on the product of first signal and secondary signal, and wherein said power control signal is based on described the 3rd signal.
14. electronic equipment according to claim 13, it is characterized in that: described first signal comprises an electric current pulse-width signal, described electric current pulse-width signal has the pulsewidth of the described output current value of a described DC power supply of representative, described secondary signal comprises a dc voltage signal, described dc voltage signal has the dc voltage value of the described output voltage values of a described DC power supply of representative, described multiplier provides described the 3rd signal, described the 3rd signal is a power pulse-width signal, and described power pulse-width signal has the pulsewidth of a described output current value of representative and described output voltage values amplitude.
15. electronic equipment according to claim 13 is characterized in that: described first path comprises:
The sensing amplifier of voltage signal that the described output current value of a described DC power supply of representative is provided; With
A comparator that receives a sawtooth signal and the described voltage signal of the described output current value of the described DC power supply of representative, described comparator provides described electric current pulse-width signal, and described electric current pulse-width signal has a pulsewidth based on the joining of described sawtooth signal and described voltage signal.
16. electronic equipment according to claim 15, it is characterized in that: described comparator provides described electric current pulse width signal, described electric current pulse width signal has first pulsewidth at the described voltage signal of the described current value of the first estate response representative, wherein said comparator provides described electric current pulse-width signal, described electric current pulse-width signal has second pulsewidth at the described voltage signal of the described current value of second grade response representative, wherein if described the first estate during greater than described second grade described first pulsewidth greater than described second pulsewidth.
17. electronic equipment according to claim 14 is characterized in that: described circuit for power conversion comprises a filter that receives described the 3rd signal and described power signal is provided.
18. electronic equipment according to claim 17 is characterized in that: described filter comprises a RC circuit.
19. a method comprises:
An output power value of a DC power supply of monitoring;
Described output power value and a threshold power value are made comparisons;
When exceeding described threshold power value, reduces described output power value the charge parameter that offers rechargeable battery.
20. method according to claim 19 is characterized in that: described monitoring step comprises:
Monitor an output current value of described DC power supply;
Monitor an output voltage values of described DC power supply;
Described output current value be multiply by described output voltage values to obtain the described output power value of described DC power supply.
21. method according to claim 19 is characterized in that: described monitoring step comprises:
Monitor an output current value of described DC power supply;
Pulse-width signal with pulsewidth of the described output current value of representative is provided;
Monitor an output voltage values of described DC power supply;
Dc voltage signal with amplitude of the described output voltage values of representative is provided;
Described pulse-width signal be multiply by described dc voltage signal to obtain one the 3rd pulse-width signal, and described the 3rd pulse-width signal has the pulsewidth of a described output current value of representative and the amplitude of a described output voltage values of representative;
Filter described the 3rd signal to obtain the 4th signal of representing the described output power value of described DC power supply.
22. a control circuit comprises:
An on-site judgment circuit, this on-site judgment circuit will have one fixedly the DC power source voltage value and the selectable voltage threshold value of output voltage values make comparisons, the described DC power supply of a representative on-site judgment signal on the throne is provided when described magnitude of voltage exceeds described optional threshold voltage; With
A control signal generation circuit, this control signal generation circuit receive described at least on-site judgment signal and further provide a control signal with the described at least on-site judgment signal of response.
23. circuit according to claim 22 is characterized in that: described on-site judgment circuit comprises a resistor network, and described resistor network receives a reference voltage level and described selectable voltage threshold value is provided.
24. circuit according to claim 23 is characterized in that: described resistor network comprises an adjustable resistance element at least.
25. circuit according to claim 22 is characterized in that: described on-site judgment circuit comprises a programmable storage element that an expectation threshold voltage is provided by programming.
26. circuit according to claim 25 is characterized in that: described programmable storage element comprises an One Time Programmable element.
27. circuit according to claim 22 is characterized in that: described optional threshold voltage response is from a host signal of an associated host Power Management Unit.
28. circuit according to claim 22 is characterized in that: the described control signal of being sent by described control signal generation circuit is a pulse-width signal that offers associated DC/DC transducer.
29. circuit according to claim 22 is characterized in that: the described control signal of being sent by described control signal generation circuit is the selector circuit signal of at least one on off state of control.
30. an electronic equipment comprises a kind of circuit, described circuit comprises:
An on-site judgment circuit, this on-site judgment circuit will have one fixedly the DC power source voltage value and the selectable voltage threshold value of output voltage values make comparisons, the described DC power supply of a representative on-site judgment signal on the throne is provided when described magnitude of voltage exceeds described optional threshold voltage; With
A control signal generation circuit, this control signal generation circuit receive described at least on-site judgment signal and further provide a control signal with the described at least on-site judgment signal of response.
31. electronic equipment according to claim 30 is characterized in that: described on-site judgment circuit comprises a resistor network, and described resistor network receives a reference voltage level and described selectable voltage threshold value is provided.
32. electronic equipment according to claim 31 is characterized in that: described resistor network comprises an adjustable resistance element at least.
33. electronic equipment according to claim 30 is characterized in that: described on-site judgment circuit comprises a programmable storage element that an expectation threshold voltage is provided by programming.
34. electronic equipment according to claim 33 is characterized in that: described programmable storage element comprises an One Time Programmable element.
35. electronic equipment according to claim 30 is characterized in that: described electronic equipment further comprises a host power supply administrative unit, the host signal from described Power Management Unit of described optional threshold voltage response that wherein provides.
36. electronic equipment according to claim 30 is characterized in that: the described control signal of being sent by described control signal generation circuit is a pulse-width signal that offers associated DC/DC transducer.
37. electronic equipment according to claim 30 is characterized in that: the described control signal of being sent by described control signal generation circuit is the selector circuit signal of at least one on off state of control.
38. a method comprises:
Choose a threshold voltage;
Fixedly the output voltage values and the described threshold voltage of DC power supply are made comparisons with one;
The described fixedly DC power supply of a representative on-site judgment signal on the throne when exceeding described threshold voltage, described output voltage values is provided.
39. according to the described method of claim 38, it is characterized in that: describedly choose described threshold voltage step and comprise: when adopting first fixedly to choose one first threshold voltage during the DC power supply, when one second threshold voltage is fixedly chosen in employing second during the DC power supply.
40., it is characterized in that: describedly choose described threshold voltage step and comprise a resistive element is adjusted to a desired value according to the described method of claim 38.
41., it is characterized in that: describedly choose described threshold voltage and comprise to the programming of memory element according to the described method of claim 38.
42. according to the described method of claim 41, it is characterized in that: described programmable storage element comprises an One Time Programmable memory element.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/618,901 | 2003-07-14 | ||
| US10/618,901 US6861823B2 (en) | 2001-08-17 | 2003-07-14 | Charging circuit for controlling a charging parameter of a rechargeable battery |
| US10/757,871 US7202634B2 (en) | 2001-08-17 | 2004-01-15 | Voltage mode, high accuracy battery charger |
| US10/757,871 | 2004-01-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1578049A true CN1578049A (en) | 2005-02-09 |
| CN1330071C CN1330071C (en) | 2007-08-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100638004A Expired - Lifetime CN1330071C (en) | 2003-07-14 | 2004-07-14 | Electric power management circuit |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3917609B2 (en) |
| CN (1) | CN1330071C (en) |
| TW (2) | TWM266636U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983373A (en) * | 2012-11-12 | 2013-03-20 | 深圳市沛城电子科技有限公司 | Charging method and device |
| CN103730937A (en) * | 2013-02-26 | 2014-04-16 | 崇贸科技股份有限公司 | Charging device |
| CN113928329A (en) * | 2020-07-13 | 2022-01-14 | 现代摩比斯株式会社 | Electronic device and operation method thereof |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110121653A1 (en) * | 2005-02-18 | 2011-05-26 | O2Micro International Limited | Parallel powering of portable electrical devices |
| TWI394037B (en) * | 2009-01-23 | 2013-04-21 | Elitegroup Computer Sys Co Ltd | System power monitoring device and method thereof |
| US8587274B2 (en) * | 2009-09-17 | 2013-11-19 | Linear Technology Corporation | Feedback control of a DC/DC power converter |
| TWI396360B (en) * | 2010-06-04 | 2013-05-11 | Leadtrend Tech Corp | Power path management circuit and method |
| CN102761167B (en) * | 2011-04-28 | 2015-02-18 | 大叶大学 | Battery management system for two-wheeled vehicle |
| TWI482392B (en) * | 2013-01-25 | 2015-04-21 | Alpha & Omega Semiconductor Cayman Ltd | An input line selector system,linear charger,switching charger and selectively connect method thereof for battery chargers |
| TWI500232B (en) * | 2013-03-19 | 2015-09-11 | Richtek Technology Corp | Multi-purpose power management chip, and power path control circuit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1049229B1 (en) * | 1999-04-29 | 2005-12-21 | STMicroelectronics S.r.l. | DC-DC converter usable as a battery charger, and method for charging a battery |
| DE69928911T2 (en) * | 1999-04-29 | 2006-08-17 | Stmicroelectronics S.R.L., Agrate Brianza | BATTERY CHARGEABLE DC CONSUMER, AND METHOD FOR CHARGING A BATTERY |
| US6498461B1 (en) * | 2001-08-17 | 2002-12-24 | O2 Micro International Limited | Voltage mode, high accuracy battery charger |
| CN2760831Y (en) * | 2003-07-14 | 2006-02-22 | 美国凹凸微系有限公司 | Power supply managing circuit |
-
2004
- 2004-06-30 TW TW093210329U patent/TWM266636U/en unknown
- 2004-06-30 TW TW093119736A patent/TWI250713B/en not_active IP Right Cessation
- 2004-07-07 JP JP2004201170A patent/JP3917609B2/en not_active Expired - Fee Related
- 2004-07-14 CN CNB2004100638004A patent/CN1330071C/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102983373A (en) * | 2012-11-12 | 2013-03-20 | 深圳市沛城电子科技有限公司 | Charging method and device |
| CN102983373B (en) * | 2012-11-12 | 2015-01-07 | 深圳市沛城电子科技有限公司 | Charging method and device |
| CN103730937A (en) * | 2013-02-26 | 2014-04-16 | 崇贸科技股份有限公司 | Charging device |
| CN113928329A (en) * | 2020-07-13 | 2022-01-14 | 现代摩比斯株式会社 | Electronic device and operation method thereof |
| CN113928329B (en) * | 2020-07-13 | 2024-02-13 | 现代摩比斯株式会社 | Electronic device and method of operating the same |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM266636U (en) | 2005-06-01 |
| JP2005039997A (en) | 2005-02-10 |
| JP3917609B2 (en) | 2007-05-23 |
| TWI250713B (en) | 2006-03-01 |
| TW200513003A (en) | 2005-04-01 |
| CN1330071C (en) | 2007-08-01 |
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