CN102570407B - Chip for protecting battery and printed circuit board (PCB) - Google Patents
Chip for protecting battery and printed circuit board (PCB) Download PDFInfo
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- CN102570407B CN102570407B CN201110422526.5A CN201110422526A CN102570407B CN 102570407 B CN102570407 B CN 102570407B CN 201110422526 A CN201110422526 A CN 201110422526A CN 102570407 B CN102570407 B CN 102570407B
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Abstract
The invention discloses a chip for protecting a battery. The chip is used for providing stable current. The chip comprises a switching control module and a time control module, wherein the switching control module is used for controlling the switching-on or switching-off of a path between a power end and a battery connecting end; the time control module is connected with the switching control module, and is used for controlling the switching-off time of the path; and the switching-off time is inversely proportional to the voltage of the battery connecting end. The invention also discloses a printed circuit board (PCB) comprising the chip.
Description
Technical field
The present invention relates to electronic technology and built-in field, particularly relate to chip and PCB for the protection of battery.
Background technology
Because the power demand of portable equipment becomes increasing, battery capacity is forced to increase, to provide satisfy the demands longer service time.This just need to shorten the charging interval of these relatively large batteries, reduce to greatest extent the heat dissipation between charge period, improve conversion efficiency, technical staff designs switching type charger, can shorten the charging interval and solve relevant to using linear charger scheme at present heat dissipation problem.Switching type charger can be single-unit or the two lithium ion batteries charging in mobile phone, smart mobile phone, panel computer, WiMAX focus, digital camera and portable media/game player and other portable product.
The structure of existing switching type charger is shown in Figure 1.Switching type charger needs inductive current to control in constant current charge process; for reaching this object; series resistor on inductive current path, generally between battery protection chip internal pin CS and pin BAT, for inductor current signal being sensed to charging controls inside and process.
Which not only takies pin CS, and the resistance on current path directly affects Current Control precision, so this resistance precision is had relatively high expectations.The value of resistance is larger, and the current signal precision detecting is just higher, but also can cause larger power dissipation simultaneously, and will make up the power dissipation causing on resistance, and the conducting resistance of power switch pipe will be less, indirectly improve product cost.
Summary of the invention
The embodiment of the present invention provides a kind of chip for the protection of battery and PCB, for more stable electric current is provided.
A chip for the protection of battery, comprising:
Switch control module, for controlling power end to UNICOM or the disconnection of the path between battery link;
The time control module being connected with switch control module, the time disconnecting for controlling described path, this time and battery link voltage are inversely proportional to.
A kind of printed circuit board (PCB) (PCB), comprises described chip.
The embodiment of the present invention controls by designing a time control module being connected with switch control module the time that power end disconnects to the path between battery link, and this time and battery link voltage are inversely proportional to.
Accompanying drawing explanation
Fig. 1 is the structure chart of PCB in prior art;
Fig. 2 is inductive current waveform schematic diagram in the embodiment of the present invention;
Fig. 3 is the primary structure figure of embodiment of the present invention chips;
Fig. 4 is the detailed structure view of embodiment of the present invention chips;
Fig. 5 is the structure chart of time control module in the embodiment of the present invention.
Embodiment
Present inventor's discovery, inductive current waveform schematic diagram when switching type charger is operated in constant current charge as shown in Figure 2.There is formula Iavg=Ipeak-Iripple/2=Ipeak-D*Toff/2=Ipeak-Toff*Vbat/2L, wherein Iavg is average current, Ipeak is peak current, Iripple is current oscillation amplitude, D is end switch cut-off on Upside Switch off() stage inductive current descending slope, Toff is end switch deadline on Upside Switch off time(), Vbat is cell voltage, L is inductance value.If Ipeak determines, wish so to obtain the fixing average current Iavg not changing with cell voltage, just needing Toff*Vbat is constant.Because Vbat can change along with charging, so will make Toff*Vbat, be constant, just need to produce the Toff being inversely proportional to Vbat.The embodiment of the present invention controls by designing a time control module being connected with switch control module the time that power end disconnects to the path between battery link, and this time and battery link voltage are inversely proportional to.
Referring to Fig. 3, the chip for the protection of battery in the present embodiment comprises: switch control module 301 and time control module 302.
The power end of switch control module 301 is used for connecting charge power supply, and the input voltage of power end represents with VINP, and VINP represents power end simultaneously.The battery link of switch control module 301 is used for connecting battery, and the voltage of battery link represents with VBAT, and VBAT represents battery link simultaneously.Switch control module 301 is for controlling power end to UNICOM or the disconnection of the path between battery link.
The time that the time control module 302 being connected with switch control module disconnects for controlling described path, this time and battery link voltage are inversely proportional to.
Concrete, shown in Figure 4, switch control module 301 comprises: trigger 401, the first comparator (CC-CMP) 402, the first control switch 403, the second control switch 404 and inductance coil 405.
Two inputs of trigger 401 connect respectively the output of the first comparator 402 and time control module 302, and the output of trigger 401 connects the control end of the first control switch 403 and the second control switch 404 and the input of connect hours control module 302.Trigger 401 is for sending the first control signal to the first control switch 403 and the second control switch 404, make the first control switch 403 conductings, the second control switch 404 disconnects, thereby make power end VINP to the path UNICOM between battery link VBAT, and under the triggering of the first comparator 402, to the first control switch 403 and the second control switch 404, send the second control signal, the first control switch 403 is disconnected, the second control switch 404 conductings, thereby power end VINP is disconnected to the path between battery link VBAT, to time control module 302, send the second control signal simultaneously, triggered time control module 302 starts timing, and when the triggering signal of time of receipt (T of R) control module 302, to the first control switch 403 and the second control switch 404, send the first control signal.Preferably, trigger 401 is rest-set flip-flop, and two inputs are R and S end, and output is Q end.
The first comparator 402, its negative input connects the link of the first control switch 403 and the second control switch 404, and connection inductance coil 405, electrode input end is for inputting the first default threshold voltage, for detection of power end VINP, to voltage on the path between battery link VBAT, whether be greater than the first default threshold voltage, when being greater than the first threshold voltage, to trigger 401, send triggering signal, to trigger trigger 401, send the second control signal.
The first control switch 403 control ends are connected with trigger 401, and two links are at power end VINP to the path between battery link VBAT, and conducting when receiving the first control signal, disconnects while receiving the second control signal.Preferably, the first control switch 403 is P-channel field-effect transistor (PEFT) pipe.
The second control switch 404 control ends are connected with trigger, and two links, on the path between earth terminal GND and battery link VBAT, disconnect conducting while receiving the second control signal when receiving the first control signal.Preferably, the second control switch 404 is N channel field-effect pipe.
The battery link VBAT of switch control module 301 can also be connected with earth terminal GND by capacitor C 1, to prevent that the voltage instantaneous of battery link VBAT from raising or reducing.
For example, the S of trigger 401 end is to Q end output low level signal (i.e. the first control signal), the first control switch 403 conductings and the second control switch 404 disconnections.Meanwhile, the Q of trigger 401 end sends low level signal (i.e. the first control signal) to time control module 302, and now time control module 302 is not-time.
After the first control switch 403 conductings and the second control switch 404 disconnect, under the effect of power end VINP, the voltage of inductance coil 405 raises gradually, and the voltage LX of the negative input of the first comparator 402 also raises gradually.Meanwhile, under the effect of power end VINP, compression limiter 406 provides the first threshold voltage Ipeak_ref for the first comparator 402.When the voltage of inductance coil 405 is during higher than the first threshold voltage Ipeak_ref, when namely inductive current has risen to peak current Ipeak, the first comparator 402 sends triggering signal (as high level signal) to the R end of trigger 401, to trigger trigger 401 set.
The Q of trigger 401 end output high level signal (i.e. the second control signal), disconnects and the second control switch 404 conductings the first control switch 403.The first control switch 403 disconnects and after the second control switch 404 conductings, the voltage of inductance coil 405 reduces gradually.
Meanwhile, the Q of trigger 401 end sends i.e. the second control signal of high level signal EN(to time control module 302), now time control module 302 starts timing.The voltage of the voltage input end of time control module 302 is directly proportional to cell voltage, along with the lower voltage of inductance coil 405, reduces.When the voltage of inductance coil 405 drops to minimum point, time control module 302 sends triggering signal (as low level signal) to the S end of trigger 401, to trigger trigger 401, resets.The S of trigger 401 end, to Q end output low level signal (i.e. the first control signal), carries out next cycle period.
Internal structure for time control module 302 describes in detail below.
Referring to Fig. 5, in the present embodiment, time control module 302 comprises: electric capacity 501, current limliting unit 502, discharge and recharge control unit 503 and the second comparator (CMP) 504.The input of current limliting unit 502 is connected with battery link VBAT, and output OUTPUT is connected with electric capacity 501.Discharge and recharge the control end EN of control unit 503 and the Q of trigger 401 end and be connected, two links are connected to the two ends of electric capacity 501.The negative input of the second comparator 504 is connected with current limliting unit 502 with electric capacity 501, and output is connected with the S end of trigger 401.
Electric capacity 501 is between current limliting unit 502 and earth terminal GND.
Current limliting unit 502 is connected with battery link VBAT, for the electric current being directly proportional to battery link VBAT voltage is provided to electric capacity 501.
Discharge and recharge control unit 503 for 501 chargings of control capacitance when receiving the second control signal, and control capacitance 501 electric discharges when receiving the first control signal.Preferably, discharge and recharge control unit 503 for P-channel field-effect transistor (PEFT) pipe, control end is connected with the control signal output (Q end) of switch control module 301, and two links connect respectively the two ends of electric capacity 501.
The second comparator 504, for by the voltage difference at electric capacity 501 two ends and the second threshold voltage VREF comparison of presetting, when being greater than the second threshold voltage VREF, sends triggering signals to switch control module 301.
Preferably, current limliting unit 502 comprises: current mirror 5021 and resistance 5022.
Current mirror 5021 comprises the first tie point and the second tie point, and the second tie point is connected with electric capacity 501, and mirror image ratio is 1:1.Preferably, current mirror 5021 comprises two N channel field-effect pipe M2 and M3, and the first tie point and the second tie point are respectively a link of two N channel field-effect pipes.Wherein, by operating voltage end VDD, provide voltage.
Resistance 5022 is between first tie point and earth terminal GND of current mirror 5021, and one end that resistance 5022 is connected with the first tie point of current mirror 5021 is also connected with battery link VBAT.
In order to obtain the input voltage of slow variation, current limliting unit 502 also comprises: buffer (BUF) 5023 and the 3rd control switch 5024.
Buffer 5023, its electrode input end connects battery link VBAT, one end that negative input contact resistance 5022 is connected with the first tie point of current mirror 5021, output connects the 3rd control switch 5024.
The 3rd control switch 5024, its control end is connected with buffer 5023, and two links are between first tie point and resistance 5022 of current mirror 5021.
If the input voltage of current limliting unit 502 is directly proportional to battery link voltage, this ratio represents with K, especially K is not 1 o'clock, current limliting unit 502 also comprises: bleeder circuit, between the electrode input end and battery link VBAT of buffer 5023, for being converted to voltage division signal, the cell voltage of acquisition exports to buffer 5023.Bleeder circuit can be realized by divider resistance.
For example, when the control end EN that discharges and recharges control unit 503 receives low level signal (i.e. the first control signal), as the field effect transistor conducting that discharges and recharges control unit 503, make electric capacity 501 electric discharges.The voltage of the negative input of the second comparator 504, lower than the voltage of electrode input end, that is to say that the voltage of electric capacity 501 is lower than the second threshold voltage VREF.
When the control end EN that discharges and recharges control unit 503 receives high level signal (i.e. the second control signal), as the field effect transistor that discharges and recharges control unit 503, disconnect, make electric capacity 501 chargings.Now, the electric current of resistance 5022 place branch roads is KVBAT/R2, and R2 is the resistance of resistance 5022.Now the electric current of branch road is directly proportional to cell voltage VBAT.By current mirror 5021, making the electric current of electric capacity 501 place branch roads is also KVBAT/R2, and take this electric current as electric capacity 501 chargings, and charging interval Toff and this electric current are inversely proportional to, and charging interval Toff and cell voltage VBAT are inversely proportional to.When the voltage of electric capacity 501 is during higher than the second threshold voltage VREF, the second comparator 504 is to the S end output triggering signal (as low level signal) of trigger 401.The control end EN that discharges and recharges control unit 503 can receive again low level signal (i.e. the first control signal), enters next cycle period.
The embodiment of the present invention controls by designing a time control module being connected with switch control module the time that power end disconnects to the path between battery link, and this time and battery link voltage are inversely proportional to.A plurality of devices in the embodiment of the present invention all adopt field effect transistor, have advantages of stable good and precision is high, and energy consumption low and be easy to integrated, simple in structure, can simplification of flowsheet.Omitted the inductance coil being connected with chip shown in Fig. 1 simultaneously, thereby simplified PCB(printed circuit board (PCB)) wiring.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (10)
1. for the protection of a chip for battery, it is characterized in that, comprise switch control module and the time control module being connected with switch control module, wherein,
Described switch control module, for controlling power end to UNICOM or the disconnection of the path between battery link, described switch control module comprises:
Trigger, for sending the first control signal to the first control switch and the second control switch, make the first control switch conducting, the second control switch disconnects, thereby make power end to the path UNICOM between battery link, and under the triggering of the first comparator, to the first control switch and the second control switch, send the second control signal, the first control switch is disconnected, the second control switch conducting, thereby power end is disconnected to the path between battery link, to time control module, send the second control signal simultaneously, triggered time control module starts timing, and when the triggering signal of time of receipt (T of R) control module, to the first control switch and the second control switch, send the first control signal,
Whether the first comparator, be greater than the first default threshold voltage for detection of power end to voltage on the path between battery link, when being greater than the first threshold voltage, to trigger, sends triggering signal, to trigger trigger, sends the second control signal;
The first control switch, control end is connected with trigger, and two links are at power end to the path between battery link, and conducting when receiving the first control signal, disconnects while receiving the second control signal;
The second control switch, control end is connected with trigger, and two links, on the path between earth terminal and battery link, disconnect conducting while receiving the second control signal when receiving the first control signal;
Inductance coil, at power end to the path between battery link;
Described time control module, the time disconnecting for controlling described path, this time and battery link voltage are inversely proportional to.
2. chip as claimed in claim 1, is characterized in that, the first control switch is P-channel field-effect transistor (PEFT) pipe; The second control switch is N channel field-effect pipe.
3. chip as claimed in claim 1, is characterized in that, switch control module also comprises: compression limiter, between power end and the first comparator, is used to the first comparator that the first threshold voltage is provided.
4. chip as claimed in claim 3, is characterized in that, compression limiter is field effect transistor, and conducting resistance is greater than the conducting resistance of the first control switch.
5. chip as claimed in claim 1, is characterized in that, time control module comprises:
Electric capacity, between current limliting unit and earth terminal;
Current limliting unit, is connected with battery link, for the electric current being directly proportional to battery link voltage is provided to electric capacity;
Discharge and recharge control unit, for control capacitor charging when receiving the second control signal;
The second comparator, for by the voltage difference at electric capacity two ends and the second threshold voltage comparison of presetting, when being greater than the second threshold voltage, sends triggering signal to switch control module.
6. chip as claimed in claim 5, is characterized in that, discharging and recharging control unit is P-channel field-effect transistor (PEFT) pipe, and control end is connected with the control signal output of switch control module, and two links connect respectively the two ends of electric capacity.
7. chip as claimed in claim 5, is characterized in that, current limliting unit comprises:
Current mirror, comprises the first tie point and the second tie point, and the second tie point is connected with electric capacity, and mirror image ratio is 1:1;
Resistance, between first tie point and earth terminal of current mirror, one end that resistance is connected with the first tie point of current mirror is also connected with battery link.
8. chip as claimed in claim 7, is characterized in that, current limliting unit also comprises:
Buffer, its electrode input end connects battery link, one end that negative input contact resistance is connected with the first tie point of current mirror, output connects the 3rd control switch;
The 3rd control switch, its control end is connected with buffer, and two links are between first tie point and resistance of current mirror.
9. chip as claimed in claim 7, is characterized in that, current limliting unit also comprises: bleeder circuit, and between the electrode input end and battery link of buffer, for being converted to voltage division signal, the cell voltage of acquisition exports to buffer.
10. a printing board PCB, is characterized in that, comprises chip as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110422526.5A CN102570407B (en) | 2011-12-15 | 2011-12-15 | Chip for protecting battery and printed circuit board (PCB) |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110422526.5A CN102570407B (en) | 2011-12-15 | 2011-12-15 | Chip for protecting battery and printed circuit board (PCB) |
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| CN102570407A CN102570407A (en) | 2012-07-11 |
| CN102570407B true CN102570407B (en) | 2014-03-12 |
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| US20100207571A1 (en) * | 2009-02-19 | 2010-08-19 | SunCore Corporation | Solar chargeable battery for portable devices |
| JP2011024395A (en) * | 2009-07-21 | 2011-02-03 | Ricoh Co Ltd | Charger and electronic apparatus |
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| CN1677788A (en) * | 2003-11-14 | 2005-10-05 | 索尼株式会社 | Battery, battery protection processing device and control method |
| JP2006351384A (en) * | 2005-06-16 | 2006-12-28 | Renesas Technology Corp | Charging control system |
| CN101179198A (en) * | 2006-11-08 | 2008-05-14 | 深圳迈瑞生物医疗电子股份有限公司 | Synchronous commutation type battery charging circuit and protective circuit thereof |
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Address after: 214028 Jiangsu New District of Wuxi, Taihu international science and Technology Park Jia Qing 530 building 10 layer Patentee after: WUXI ZHONGGAN MICROELECTRONIC CO., LTD. Address before: 214028 Jiangsu New District of Wuxi, Taihu international science and Technology Park Jia Qing 530 building 10 layer Patentee before: Wuxi Vimicro Co., Ltd. |