CN1293480A - Control device and method for changing charge current with system load - Google Patents
Control device and method for changing charge current with system load Download PDFInfo
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- CN1293480A CN1293480A CN 99123356 CN99123356A CN1293480A CN 1293480 A CN1293480 A CN 1293480A CN 99123356 CN99123356 CN 99123356 CN 99123356 A CN99123356 A CN 99123356A CN 1293480 A CN1293480 A CN 1293480A
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Abstract
A control device and method for changing the charging current according to system load to speed up the charging battery in working state features that a resistor serially connected with system load is used to detect the change in load current and convert it to load voltage, a voltage regulator is used to regulate the detected load voltage, and the regulated load voltage is added to the output of PWM generator for using the PWM signal to control the on state of charging path, so regulating the charging current.
Description
The present invention relates to a kind of charging control circuit and control method, particularly at the rechargeable battery that is used in the electronic installation (for example mobile computer or the like), can be according to real system load institute consumed current size, the size of actual charge current is adjusted on mobility ground, uses and accelerates the charging rate of rechargeable battery when system load diminishes.
General mobile computer (notebook) and various portable computer equipment mostly are to adopt the main source of battery as power supply, the requirement of portable to meet (protable) characteristic.Battery is because the restriction of volume mostly has certain effective power-on time, but for the user of this kind equipment of long period of operation, limited power-on time has just limited the operational degree of freedom of user.Therefore, for portable product, prolonging power-on time is very important problem.
The method that prolongs power-on time at present mainly is to utilize rechargeable battery to realize.For instance, the normal battery types that uses mostly is so-called secondary cell in the general mobile computer, and the battery that just has chargeable characteristic is as Ni-MH battery, lithium battery or the like.But, because general battery pack approximately is merely able to keep the power-on time of a few hours, so mobile computer still must use general civil power to operate in some cases.In addition, therefore for convenience general operational convenience of user can add charging circuit simultaneously in mobile computer, can not need to pull down rechargeable battery set and just can charge.
Investing the charging circuit on the mobile computer at present, mostly is the charging modes that adopts fixed electric current.Just charging circuit can come rechargeable battery is charged with a fixed current.According to the characteristic of general rechargeable battery, charging current can determine its charging interval, and in other words, when charging current heals when big, the needed charging interval will be shorter; When charging current more hour, the needed charging interval also will be longer.According to the above, following phenomenon can appear in the charging circuit on the existing mobile computer.
When mobile computer is in the state of shutdown, when just system did not need to consume electric power, therefore the action that charging circuit can utilize maximum charging current to charge can reach the fastest charging rate.On the other hand, when mobile computer is in the state of start,,, also will delay the speed of charging so must charge with less charging current because system load need consume electric power.Problem is, even system load diminishes in operating process, because charging circuit is to provide charging current with fixed form, so still can charge with less charging current.The situation that system load diminishes may occur in mobile computer and be in park mode (suspend or standby) following time, or some device of mobile computer is when being closed.So, even system load only consumes quite low electric power, but the charging rate that can't accelerate to charge at the same time.Apparently, so do not make full use of all electric power that AC transformer (ACadaptor) is provided.
For this reason, main purpose of the present invention, be to provide a kind of control device and control method of changing charge current with system load, the variation of detection system load at any time and adjust the charging current supplied accordingly so that when start the speed of accelerated charging.
According to above-mentioned purpose, the invention provides a kind of control device of changing charge current with system load, in order to the charging current of control power supply to rechargeable battery, it comprises a current sensing element (being resistance), be series at system load, the load current that is used for flowing through system load is converted to the load voltage of a correspondence; One voltage conversion circuit is coupled to current sensing element and produces a control voltage according to this load voltage; And one charging current adjust circuit, place power supply to the charge path of rechargeable battery and couple voltage conversion circuit, it adjusts the charging current that power supply is sent rechargeable battery according to control voltage.Above-mentioned resistance and voltage conversion circuit can be considered a load current detection circuit.
Wherein, charging current is adjusted circuit and is comprised: a pulse-width modulation circuit, and it produces corresponding pulse-width signal according to control voltage, and the pulsewidth of this pulse-width signal is corresponding to the load current of system load; And a switch element, being coupled to pulse-width modulation circuit and placing the charge path of power supply rechargeable battery, it adjusts the on off state of charge path according to the pulsewidth of pulse-width signal, uses the adjustment charging current.
In addition, the control method of changing charge current with system load of the present invention then comprises the following steps.At first, utilize the current sensing element that is series at system load, the load current that will flow through system load is converted to a load voltage.Then, adjust load voltage to produce a control signal.According to this control signal, the conducting state of control charge path is used the size that changes charging current with system load at last.Step at control charge path state, then can be earlier according to control signal, generation has the pulse-width signal of corresponding pulsewidth, again by placing the switch element of charge path, utilize the corresponding pulsewidth of pulse-width signal, the conducting state of control charge path is used and is adjusted the charging current that power supply is sent rechargeable battery.
Disclosed charging control circuit and method mainly are when starting shooting in system's (as mobile computer), can decide the actual charging current size of sending according to the situation of system load.By this, even the phenomenon that system load diminishes (that is consuming lower electric power) under open state, has appearred in system, still can provide bigger charging current in rechargeable battery, with the speed of accelerated charging.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below especially exemplified by a preferred embodiment, and cooperate appended graphicly, be described in detail below:
Fig. 1 represents in the embodiment of the invention detailed circuit diagram in order to the charging control circuit of changing charge current with system load.
Fig. 2 represents the flow chart of the charge control method in the embodiment of the invention.
Label declaration in the accompanying drawing:
1～system load; 2～PWM produces circuit; 3～5V voltage adjuster; R1-R9～resistance; D1-D4～diode; OP1～operational amplifier; C1～capacitor; BATT～rechargeable battery; V1～load voltage; V2～control voltage.
Fig. 1 represents in the embodiment of the invention detailed circuit diagram in order to the charging control circuit of changing charge current with system load.Among the figure, VIN represents external dc power, and for example electric main is through the DC power supply of the mobile computer that processing is delivered to of AC-DC transducer (ACadapter).Label 1 expression system load, that is the electronic component and the device of general mobile computer inside.BATT represents rechargeable battery set.Both are relation in parallel for rechargeable battery set BATT and system load 1, and by charging (power supply) circuit, the action of being charged and being powered by external dc power VIN.
As shown in the figure, elements such as capacitor C1, inductor L1 and diode D4 promptly place on charging (power supply) path, the radio-frequency component of removing power supply is provided and prevents function such as EMI interference.Diode D1, D2 and D3 are used for controlling charging and the supply path of external dc power VIN to rechargeable battery resistance BATT and system load 1.For instance, as rechargeable battery set BATT as yet not during full charging power, the external voltage of rechargeable battery set BATT can be lower, therefore, diode D1 and D3 can be switched on, this moment, external dc power VIN can charge to rechargeable battery set BATT by diode D1 on one side, by diode D3 system load 1 powered on one side.This moment, diode D2 was a reverse biased then, presented not on-state.After rechargeable battery set BATT full charging power, diode D1 just can close and cut off charge path, and external dc power VIN still continues system load 1 is powered by diode D3.Diode D2 then externally DC power supply VIN be cut off the back conducting, change by this by rechargeable battery set BATT and continue system load 1 power supply.In addition, 3 of 5V voltage regulators convert external dc power VIN (being generally 12V) voltage of 5V to, are used to provide the electric power of operational amplifier OP1 (aftermentioned).In addition, resistance networking (comprising resistance R 2, R3, R4, R5, R6) then is to be used for producing a reference voltage, and delivers to PWM generation circuit 2 (aftermentioned), provides the electric current of deciding of rechargeable battery set BATT to feedback.
The charging control circuit of present embodiment, mainly constituted: resistance R 7 by following each element, voltage-regulating circuit (comprising resistance R 8, R9 and operational amplifier OP1), PWM (pulsewidthmodulation, pulse-width modulation) produce circuit 2, and switch element (comprising resistance R 1 and transistor Q1).
Resistance R 7 is as a current sensing element, and it is series at system load 1, that is be coupled to system load 1 and earth terminal between.Load current by system load 1 can flow through resistance R 7, is converted to the load voltage V1 of a correspondence by this.The end of oppisite phase of operational amplifier OP1 (invertingterminal) and non-oppisite phase end (non-invertingterminal) then couple the two ends of resistance R 7, resistance ratio according to resistance R 8 and R9, adjust load voltage V1 (control signal), again it is added on the reference voltage that resistance networking (R2-R6) produced, produce a control voltage V2 (the resistance ratio by reference voltage, load voltage V1 and resistance R 8, R9 is determined), deliver to PWM and produce circuit.PWM produces circuit 2 according to this control voltage V2 (or control signal), then produces a pulse-width signal, and its pulsewidth is corresponding to the value of this control voltage.Last this pulse-width signal is sent to the base stage of transistor Q1, makes the ground opening and closing of charge path inter-continuation, the charging current size of sending with adjustment.
How below describe this circuit in detail along with system load, adjust the charging current of delivering to rechargeable battery set BATT.At first, supposing the system load 1 is in high load condition (normal condition), and this moment, load voltage V1 was a stationary value, and after adjusting by operational amplifier OP1 and resistance R 8, R9, was superimposed upon on the reference voltage, as control voltage V2.PWM produces circuit 2 then according to this control voltage V2, produces the pulse-width signal with set pulsewidth, uses the on off state of oxide-semiconductor control transistors Q1.At this moment, power supply and charging system system are in stable status, that is system load 1 can consume big electric current, and rechargeable battery set BATT charges with lower charging current.
When system load 1 descends, that is its load current is when reducing, and the electric current that flow through resistance R 7 this moment also can diminish, and makes load voltage V1 descend.The adjustment of process operational amplifier OP1 and resistance R 8, R9, can be superimposed upon on the reference voltage (at this moment with control signal with lower voltage value, examining ginseng voltage also can change, to keep the current characteristics of deciding of rechargeable battery set BATT, that is the change of reference voltage is corresponding to the change of the load current of system load 1, so its explanation of omission in the aftermentioned explanation).Therefore, PWM produces circuit 2 meetings corresponding to this load voltage V1, and changes the pulsewidth of the pulse-width signal of its output.At last, the variation of this pulsewidth can increase the time of charge path conducting, that is flows out more electric current from external dc power VIN.Because 1 of system load consumes its required electric current, so most electric current (charging current) promptly can flow to rechargeable battery set BATT, quickens the speed of its charging, can reach purpose of the present invention by this.
In the present embodiment, resistance R 7 and voltage conversion circuit (comprising operational amplifier OP1, resistance R 8, R9) also can be implemented by other load current detection circuit, in addition, PWM produces circuit 2 and switch element (comprising transistor Q1 and resistance R 1) also can be implemented by other charging current adjustment circuit, and therefore circuit structure shown in Figure 1 is not in order to limit the present invention.
Fig. 2 promptly represents the flow chart of pairing charge control method in the embodiment of the invention.As shown in the figure, at first, utilize the resistance (resistance R 7 as shown in Figure 1) that is series at system load, detect the change (S1) of load current.Then, adjust its size, so that be applicable to (S2) in the PWM modulator with detected load voltage (or electric current).On the input of the PWM that again this adjusted load voltage (electric current) is added to generation circuit (S3).At last, utilize pwm signal and transistor switch action on charge path, regulate the actual charging current (S4) of delivering to rechargeable battery.So, can reach purpose of the presently claimed invention.
Though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; those skilled in the art also can make many conversion and modification, so protection scope of the present invention are limited by appended claims without departing from the spirit and scope of the present invention.
Claims (19)
1. the control device of a changing charge current with system load, in order to control the charging current of a power supply to a rechargeable battery, it comprises:
One current sensing element is series at this system load, and the load current that flows through a system load in order to conversion is a load voltage;
One voltage conversion circuit is coupled to this current sensing element, in order to receiving this load voltage, and produces a control signal; And
One charging current is adjusted circuit, places this power supply to the charge path of this rechargeable battery and couple this voltage conversion circuit, and it adjusts the charging current that this power supply is sent this rechargeable battery according to this control signal.
2. control device as claimed in claim 1 is characterized in that, this charging current is adjusted circuit and comprised:
Pulse-width modulation circuit, it produces a corresponding pulse-width signal according to this control signal, and the pulsewidth of this pulse-width signal is corresponding to the load current of this system load; And
One switch element is coupled to this pulse-width modulation circuit and places the charge path of this power supply to this rechargeable battery, and it adjusts the on off state of this charge path according to the pulsewidth of this pulse-width signal, uses the adjustment charging current.
3. control device as claimed in claim 2 is characterized in that, this switch element is a transistor, and its base stage receives this pulse-width signal, and its collector and emitter is coupled to this rechargeable battery and this power supply respectively.
4. control device as claimed in claim 1 is characterized in that this rechargeable battery is parallel to this system load.
5. control device as claimed in claim 4 is characterized in that, this charging current is adjusted circuit and comprised:
Pulse-width modulation circuit, it produces a corresponding pulse-width signal according to this control signal, and the pulsewidth of this pulse-width signal is corresponding to the load current of this system load; And
One switch element is coupled to this pulse-width modulation circuit and places the charge path of this power supply to this rechargeable battery, and it adjusts the on off state of this charge path according to the pulsewidth of this pulse-width signal, uses the adjustment charging current.
6. control device as claimed in claim 5 is characterized in that, this switch element is a transistor, and its base stage receives this pulse-width signal, and its collector and emitter is coupled to this rechargeable battery and this power supply respectively.
7. control device as claimed in claim 1 is characterized in that, this current sensing element is a resistance.
8. control device as claimed in claim 1 is characterized in that this voltage conversion circuit is made of operational amplifier.
9. the control device of a changing charge current with system load, in order to control the charging current of a power supply to a rechargeable battery, it comprises:
One load current detection circuit flows through the load current of a system load in order to detection, and produces corresponding control signal; And
One charging current is adjusted circuit, places this power supply to the charge path of this rechargeable battery and couple this load current detection circuit, and it adjusts the charging current that this power supply is sent this rechargeable battery according to this control signal.
10. control device as claimed in claim 9 is characterized in that, this charging current is adjusted circuit and comprised:
Pulse-width modulation circuit, it produces a corresponding pulse-width signal according to this control signal, and the pulsewidth of this pulse-width signal is corresponding to the load current of this system load; And
One switch element is coupled to this pulse-width modulation circuit and places the charge path of this power supply to this rechargeable battery, and it adjusts the on off state of this charge path according to the pulsewidth of this pulse-width signal, uses the adjustment charging current.
11. control device as claimed in claim 10 is characterized in that, this switch element is a transistor, and its base stage receives this pulse-width signal, and its collector and emitter is coupled to this rechargeable battery and this power supply respectively.
12. control device as claimed in claim 9 is characterized in that, this rechargeable battery is parallel to this system load.
13. control device as claimed in claim 12 is characterized in that, this charging current is adjusted circuit and is comprised:
Pulse-width modulation circuit, it produces a corresponding pulse-width signal according to this control signal, and the pulsewidth of this pulse-width signal is corresponding to the load current of this system load; And
One switch element is coupled to this pulse-width modulation circuit and places the charge path of this power supply to this rechargeable battery, and it adjusts the on off state of this charge path according to the pulsewidth of this pulse-width signal, uses the adjustment charging current.
14. control device as claimed in claim 13 is characterized in that, this switch element is a transistor, and its base stage receives this pulse-width signal, and its collector and emitter is coupled to this rechargeable battery and this power supply respectively.
15. the control device of a changing charge current with system load, in order to control the charging current of a power supply to a rechargeable battery, this system load is parallel to this rechargeable battery, and this system load and this rechargeable battery be coupled to this power supply by a charge path, and it comprises:
One resistance, be coupled to this system load and earth terminal between, flow through the load current of this system load in order to conversion, and on the two-end-point of this resistance, produce the load voltage of a correspondence;
One operation amplifier circuit, its end of oppisite phase and non-oppisite phase end are respectively coupled to the two-end-point of this resistance, in order to receiving this load voltage, and produce a control signal;
One pulse-width modulation circuit is coupled to this operation amplifier circuit, and it controls voltage according to this, produces a corresponding pulse-width signal, and the pulsewidth of this pulse-width signal is corresponding to the load current of this system load; And
One switch element is coupled to this pulse-width modulation circuit and places this charge path, and it adjusts the on off state of this charge path according to the pulsewidth of this pulse-width signal, uses the part of adjusting charging current.
16. control device as claimed in claim 15 is characterized in that, this switch element is a transistor, and its base stage receives this pulse-width signal, and its collector and emitter is coupled to this rechargeable battery and this power supply respectively.
17. the control method of a changing charge current with system load, in order to control the charging current of a power supply to a rechargeable battery, this system load is parallel to this rechargeable battery, and this system load and this rechargeable battery are coupled to this power supply by a charge path, and this control method comprises the following steps:
Utilization is series at the current sensing element of this system load, and the load current that will flow through this system load is converted to a load voltage;
Adjust this load voltage to produce a control signal; And
According to this control signal, control the conducting state of this charge path, use the size that changes this charging current with this system load.
18. control method as claimed in claim 17 is characterized in that, comprises in the step of the conducting state of controlling this charge path:
According to this control signal, produce pulse-width signal with corresponding pulsewidth; And
By placing the switch element of this charge path, utilize the corresponding pulsewidth of this pulse-width signal, control the conducting state of this charge path, use and adjust the charging current that this power supply is sent this rechargeable battery.
19. control method as claimed in claim 18 is characterized in that, this switch element is a transistor, and its base stage receives this pulse-width signal, and its collector and emitter is coupled to this rechargeable battery and this power supply respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99123356 CN1118917C (en) | 1999-10-18 | 1999-10-18 | Control device and method for changing charge current with system load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99123356 CN1118917C (en) | 1999-10-18 | 1999-10-18 | Control device and method for changing charge current with system load |
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| Publication Number | Publication Date |
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| CN1293480A true CN1293480A (en) | 2001-05-02 |
| CN1118917C CN1118917C (en) | 2003-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 99123356 Expired - Fee Related CN1118917C (en) | 1999-10-18 | 1999-10-18 | Control device and method for changing charge current with system load |
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| CN (1) | CN1118917C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199582A (en) * | 2013-03-27 | 2013-07-10 | 广东欧珀移动通信有限公司 | Charging current adjustment method and charging current adjustment device |
| CN103208659A (en) * | 2012-01-16 | 2013-07-17 | 联想(北京)有限公司 | Charging method for electronic apparatus, and electronic apparatus |
| CN103313004A (en) * | 2013-05-22 | 2013-09-18 | 深圳Tcl新技术有限公司 | Intelligent charging method and device of television |
| CN103457306A (en) * | 2012-06-05 | 2013-12-18 | 华为终端有限公司 | Charging device |
| CN103699204A (en) * | 2013-11-28 | 2014-04-02 | 青岛歌尔声学科技有限公司 | System power consumption regulating circuit, method and electronic equipment |
| CN112114206A (en) * | 2019-06-21 | 2020-12-22 | 台达电子工业股份有限公司 | Charging load detection circuit |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100437509C (en) * | 2005-12-07 | 2008-11-26 | 微星科技股份有限公司 | Monitoring device for operation of hardware element |
-
1999
- 1999-10-18 CN CN 99123356 patent/CN1118917C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103208659A (en) * | 2012-01-16 | 2013-07-17 | 联想(北京)有限公司 | Charging method for electronic apparatus, and electronic apparatus |
| CN103208659B (en) * | 2012-01-16 | 2016-12-14 | 联想(北京)有限公司 | Electronic equipment charging method and electronic equipment |
| CN103457306A (en) * | 2012-06-05 | 2013-12-18 | 华为终端有限公司 | Charging device |
| CN103457306B (en) * | 2012-06-05 | 2016-03-30 | 华为终端有限公司 | Charging device |
| CN103199582A (en) * | 2013-03-27 | 2013-07-10 | 广东欧珀移动通信有限公司 | Charging current adjustment method and charging current adjustment device |
| CN103199582B (en) * | 2013-03-27 | 2016-02-03 | 广东欧珀移动通信有限公司 | Charging current method of adjustment and device |
| CN103313004A (en) * | 2013-05-22 | 2013-09-18 | 深圳Tcl新技术有限公司 | Intelligent charging method and device of television |
| CN103699204A (en) * | 2013-11-28 | 2014-04-02 | 青岛歌尔声学科技有限公司 | System power consumption regulating circuit, method and electronic equipment |
| CN112114206A (en) * | 2019-06-21 | 2020-12-22 | 台达电子工业股份有限公司 | Charging load detection circuit |
| CN112114206B (en) * | 2019-06-21 | 2023-08-18 | 台达电子工业股份有限公司 | Charging load detection circuit |
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| CN1118917C (en) | 2003-08-20 |
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