CN107508270A - The device overshooted when preventing the constant current of terminal charge circuit from starting - Google Patents
The device overshooted when preventing the constant current of terminal charge circuit from starting Download PDFInfo
- Publication number
- CN107508270A CN107508270A CN201610415217.8A CN201610415217A CN107508270A CN 107508270 A CN107508270 A CN 107508270A CN 201610415217 A CN201610415217 A CN 201610415217A CN 107508270 A CN107508270 A CN 107508270A
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- Prior art keywords
- loop
- voltage
- voltage comparator
- constant current
- constant
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention provides a kind of device overshooted when preventing the constant current of terminal charge circuit from starting, the charging circuit includes the BUCK loops being made up of constant current charging loop or constant-voltage charge loop, the constant-voltage charge loop includes first voltage comparator, when first voltage comparator output is low, constant-voltage charge loop work, the constant-voltage charge loop are provided with relaxed starter；The constant current charging loop includes second voltage comparator, when second voltage comparator output is low, constant current charging loop work；Delay scheduled time interval at the time of relative to the enable signal of the first voltage comparator being high level at the time of the enable signal of the second voltage comparator is high level.The present invention can effectively prevent from reducing while current over pulse problem when constant current starts the area of chip.
Description
Technical field
The present invention relates to electronic circuit technology field, more particularly to one kind to prevent the constant current of terminal charge circuit from starting
When the device that overshoots.
Background technology
Modern electronic product portability, intellectuality increasingly, thus also their supplying cell is proposed it is light,
It is efficient to require.Rechargeable battery, which is that charging times are limited, rechargeable battery, have economical and environmentally friendly etc. excellent
Point.Electronic equipment is usually provided with charging circuit, for managing the charging between adapter and rechargeable battery.
When charger charges, when the voltage ratio of rechargeable battery is relatively low is less than 4.2V, system is operated in constant current and filled
Electric stage, now constant current charging loop (CC loop) work；When charged battery voltage is close to 4.2V, it is
System is operated in constant voltage charging phase, and now constant-voltage charge loop (CV loop) works, when battery starts to charge up
When cell voltage if less than 4.2V, then constant current charging loop is worked, and charger is started with constant current charging mode
Charging.When CC loop work, corresponding CC_EA output is low in CC loop, and now CV loop
With AICL loop corresponding to CV_EA and AICL_EA output be high level.
CV loop are the Buck loops of a routine, have overshoot to prevent CV loop starts from exporting, one
As CV loop can do delay startup.In the case of CV_EA and CC_EA enable signal synchronization, in perseverance
When stream starts, during being established due to CC loop, loop response needs the time, so that CC loop
EA output be easy to be charged to overshoot, so as to cause starting current to overshoot.It is existing to be directed to constant current loop
Overshooting problem during startup, delay startup mainly is done to constant current loop, corresponding CC_EA benchmark done slow
Start or delay startup is done in the output to corresponding CC_EA.
During the present invention is realized, inventor has found following technical problem in the prior art at least be present：
Delay startup is done to constant current loop to be needed to increase a bulky capacitor, so as to waste chip area.
The content of the invention
A kind of device for preventing from overshooting during terminal charge circuit constant current startup provided by the invention, can effectively prevent
Only constant current start when current over pulse problem while reduce chip area.
In a first aspect, the present invention provides a kind of device overshooted when preventing the constant current of terminal charge circuit from starting, institute
State the BUCK loops that charging circuit includes being made up of constant current charging loop or constant-voltage charge loop, the constant pressure
Charge loop includes first voltage comparator, when first voltage comparator output is low, constant-voltage charge ring
Road works, and the constant-voltage charge loop is provided with relaxed starter；The constant current charging loop includes the second electricity
Comparator is pressed, when second voltage comparator output is low, constant current charging loop work；Characterized in that,
Relative to the first voltage comparator at the time of enable signal of the second voltage comparator is high level
Delay scheduled time interval at the time of enable signal is high level.
Alternatively, when the enable signal of the first voltage comparator is high level, first voltage comparator work
Make；When the enable signal of the second voltage comparator is high level, the work of second voltage comparator.
Alternatively, the predetermined time interval is 2ms.
Alternatively, the normal phase input end of the first voltage comparator is reference voltage, and inverting input is electricity
Pond partial pressure, output end connect the grid of the first metal-oxide-semiconductor, the source ground of the first metal-oxide-semiconductor, drain electrode connection
PWM controller；
The normal phase input end of the second voltage comparator is reference voltage, and inverting input is battery sampling electricity
Stream flows through the voltage of resistance, and output end connects the grid of the second metal-oxide-semiconductor, the source ground of the second metal-oxide-semiconductor,
Drain electrode connection PWM controller.
The device provided in an embodiment of the present invention for preventing from overshooting during terminal charge circuit constant current startup, for constant current
Charge loop and the enable signal of the voltage comparator in constant-voltage charge loop are handled so that constant-current charge
The high level of the enable signal of voltage comparator is relative to the voltage comparator in constant-voltage charge loop in loop
The high level delay scheduled time interval of enable signal, other loops are driven by the startup of constant-voltage charge loop
Startup, because constant-voltage charge loop is provided with delay startup, thus overshoot will not be produced, when loop response
Restart constant current charging loop when coming over, the EA outputs of constant current charging loop do not overshoot, thus avoid perseverance
Current over pulse when stream starts.
Brief description of the drawings
Fig. 1 is the charging in the device overshooted when one embodiment of the invention prevents the constant current of terminal charge circuit from starting
Electrical block diagram；
Fig. 2 is in the device overshooted when preventing the constant current of terminal charge circuit from starting that one embodiment of the invention provides
Constant current charging loop, the partial circuit diagram of constant-voltage charge loop and AICL loops
Fig. 3 is in the device overshooted when one embodiment of the invention prevents the constant current of terminal charge circuit from starting
The sequential logic schematic diagram of CC_EA and CV_EA enable signal；
Fig. 4 is the synchronous oscillogram of enable signal EN, EN1；
Fig. 5 is the oscillogram that the corresponding enable signal EN of enable signal EN1 postpone 2ms.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the present invention
Accompanying drawing in embodiment, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that
Described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based on this hair
Embodiment in bright, the institute that those of ordinary skill in the art are obtained under the premise of creative work is not made
There is other embodiment, belong to the scope of protection of the invention.
The present invention provides a kind of device overshooted when preventing the constant current of terminal charge circuit from starting, the charging circuit
Including the BUCK loops being made up of constant current charging loop or constant-voltage charge loop, the constant-voltage charge loop includes
First voltage comparator, when first voltage comparator output is low, constant-voltage charge loop work is described
Constant-voltage charge loop is provided with relaxed starter；The constant current charging loop includes second voltage comparator, when
When second voltage comparator output is low, constant current charging loop work；The second voltage comparator makes
Can signal at the time of be high level relative to the enable signal of the first voltage comparator at the time of be high level
Delay scheduled time interval.
The device provided in an embodiment of the present invention for preventing from overshooting during terminal charge circuit constant current startup, for constant current
Charge loop and the enable signal of the voltage comparator in constant-voltage charge loop are handled so that constant-current charge
The high level of the enable signal of voltage comparator is relative to the voltage comparator in constant-voltage charge loop in loop
The high level delay scheduled time interval of enable signal, other loops are driven by the startup of constant-voltage charge loop
Startup, because constant-voltage charge loop is provided with delay startup, thus overshoot will not be produced, when loop response
Restart constant current charging loop when coming over, the EA outputs of constant current charging loop do not overshoot, thus avoid perseverance
Current over pulse when stream starts.
Alternatively, when the enable signal of the first voltage comparator is high level, first voltage comparator work
Make；When the enable signal of the second voltage comparator is high level, the work of second voltage comparator.
Alternatively, the predetermined time interval is 2ms.
Alternatively, the normal phase input end of the first voltage comparator is reference voltage, and inverting input is electricity
Pond partial pressure, output end connect the grid of the first metal-oxide-semiconductor, the source ground of the first metal-oxide-semiconductor, drain electrode connection
PWM controller；
The normal phase input end of the second voltage comparator is reference voltage, and inverting input is battery sampling electricity
Stream flows through the voltage of resistance, and output end connects the grid of the second metal-oxide-semiconductor, the source ground of the second metal-oxide-semiconductor,
Drain electrode connection PWM controller.
Specifically, the charging circuit of terminal is as shown in figure 1, the charging circuit includes charging end VBUS, the
One NMOS tube Q1, the second NMOS tube Q2, the 3rd NMOS tube Q3, the 4th NMOS tube Q4,
PWM controller, loop unit, inductance and electric capacity, the first NMOS tube of the charging end VBUS connections
Q1 drain electrode, the first NMOS tube Q1 grid connection charge pump, the first NMOS tube Q1 source electrode connect
Connect the second NMOS tube Q2 drain electrode, one end and the 3rd of the second NMOS tube Q2 source electrode connection inductance
NMOS tube Q3 drain electrode, one end of other end connection electric capacity of inductance and the 4th NMOS tube Q4 leakage
Pole, the other end ground connection of electric capacity；3rd NMOS tube Q3 source ground；Second NMOS tube Q2's
Grid and the 3rd NMOS tube Q3 grid connect PWM controller, the 4th NMOS tube Q4 source electrode
Rechargeable battery, the 4th NMOS tube Q4 grid linkloop unit are connected, loop unit is also connected with simultaneously
Rechargeable battery and PWM controller, the loop unit include constant current charging loop, constant-voltage charge loop and
AICL loops, same time only have a loop work.In the charging circuit, from VBUS by Q1,
Q2, Q3, Q4 to CHGOUT are a BUCK loops, the system be operated under BUCK patterns to
Rechargeable battery Battery charges, and charging circuit includes what is be made up of constant current charging loop or constant-voltage charge loop
BUCK loops.The system can undergo CC Loop (constant-current charge) and arrive CV LOOP (constant-voltage charge), finally fill
Electricity terminates stable in CV loop, the charging voltage finally needed.If charging under BUCK patterns
Electric current is bigger, then AICL loop works, goes to reduce the charging current of input by AICL loops.Figure
2 be CC loop, CV loop, AICL loop partial circuit, same time only one of which loop work
Make, when some loop work, corresponding EA outputs are low, and other EA outputs are height, corresponding
Loop is closed.CV loop include first voltage comparator, permanent when first voltage comparator output is low
Charge loop work is pressed, CV loop are provided with relaxed starter；CC loop include second voltage comparator,
When second voltage comparator output is low, CC loop work.The positive of the first voltage comparator is defeated
It is reference voltage to enter end, and inverting input is battery voltage divider, and output end connects the grid of the first metal-oxide-semiconductor, the
The source ground of one metal-oxide-semiconductor, drain electrode connection PWM controller；The positive of the second voltage comparator is defeated
It is reference voltage to enter end, and inverting input is the voltage that battery sampling electric current flows through resistance, and output end connects the
The grid of two metal-oxide-semiconductors, the source ground of the second metal-oxide-semiconductor, drain electrode connection PWM controller.If CC
Loop is not provided with relaxed starter, second voltage comparator and the height of the enable signal of first voltage comparator
In the case that level preserves unanimously, during circuit start, CC loop EA outputs are easy to be filled
Electricity is to overshoot, so as to result in starting current overshoot.
Current over pulse of the invention by optimizing in logical-sequential control elimination constant current startup, as shown in figure 3,
CV_EA and CC_EA enable signal EN, EN1 is processed respectively, waits CV_EA enable signal
Export after continuing 2ms for high level, CC_EA enable signal exports as high level again, passes through CV loop
Startup drive other loop starts, when coming etc. loop response, then cause CC_EA enable signal output
For height, CC_EA output does not overshoot when so starting, thus will not also cause starting current to overshoot.Figure
4 be the synchronous oscillogram of enable signal EN, EN1, in the case of the synchronization of enable signal EN, EN1,
There is a big pulsed current signal in electric current, current over pulse be present.Fig. 5 is that enable signal EN1 is corresponding
Enable signal EN postpones 2ms oscillogram, and electric current does not have big pulse current after CV loop startups, from
And current over pulse is not present.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited to
This, any one skilled in the art the invention discloses technical scope in, can readily occur in
Change or replacement, should all be included within the scope of the present invention.Therefore, protection scope of the present invention
It should be defined by scope of the claims.
Claims (4)
1. a kind of device for preventing from overshooting during terminal charge circuit constant current startup, the charging circuit are included by perseverance
The BUCK loops of current charge loop or constant-voltage charge loop composition, the constant-voltage charge loop include the first electricity
Comparator is pressed, when first voltage comparator output is low, constant-voltage charge loop work, the constant pressure is filled
Electric loop is provided with relaxed starter；The constant current charging loop includes second voltage comparator, when this second
When voltage comparator output is low, constant current charging loop work；Characterized in that, the second voltage compares
Relative to the enable signal of the first voltage comparator it is high level at the time of the enable signal of device is high level
At the time of delay scheduled time interval.
2. the device according to claim 1 for preventing from overshooting during terminal charge circuit constant current startup, it is special
Sign is, when the enable signal of the first voltage comparator is high level, the work of first voltage comparator；
When the enable signal of the second voltage comparator is high level, the work of second voltage comparator.
3. the device according to claim 2 for preventing from overshooting during terminal charge circuit constant current startup, it is special
Sign is,
The predetermined time interval is 2ms.
4. the device according to claim 3 for preventing from overshooting during terminal charge circuit constant current startup, it is special
Sign is,
The normal phase input end of the first voltage comparator is reference voltage, and inverting input is battery voltage divider,
Output end connects the grid of the first metal-oxide-semiconductor, the source ground of the first metal-oxide-semiconductor, drain electrode connection PWM controls
Device processed；
The normal phase input end of the second voltage comparator is reference voltage, and inverting input is battery sampling electricity
Stream flows through the voltage of resistance, and output end connects the grid of the second metal-oxide-semiconductor, the source ground of the second metal-oxide-semiconductor,
Drain electrode connection PWM controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610415217.8A CN107508270B (en) | 2016-06-14 | 2016-06-14 | The device for preventing terminal charge circuit constant current from overshooting when starting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610415217.8A CN107508270B (en) | 2016-06-14 | 2016-06-14 | The device for preventing terminal charge circuit constant current from overshooting when starting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107508270A true CN107508270A (en) | 2017-12-22 |
| CN107508270B CN107508270B (en) | 2019-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610415217.8A Active CN107508270B (en) | 2016-06-14 | 2016-06-14 | The device for preventing terminal charge circuit constant current from overshooting when starting |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100060251A1 (en) * | 2008-09-08 | 2010-03-11 | Torex Semiconductor Ltd. | Step-Up Switching Power Supply Circuit |
| CN101887284A (en) * | 2009-05-12 | 2010-11-17 | 三美电机株式会社 | Regulating circuit |
| CN103227484A (en) * | 2012-01-25 | 2013-07-31 | 三美电机株式会社 | Charge controller with protection function and battery pack |
| CN205430716U (en) * | 2015-09-29 | 2016-08-03 | 上海裕芯电子科技有限公司 | Built -in low -voltage protection's LED control circuit |
-
2016
- 2016-06-14 CN CN201610415217.8A patent/CN107508270B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100060251A1 (en) * | 2008-09-08 | 2010-03-11 | Torex Semiconductor Ltd. | Step-Up Switching Power Supply Circuit |
| CN101887284A (en) * | 2009-05-12 | 2010-11-17 | 三美电机株式会社 | Regulating circuit |
| CN103227484A (en) * | 2012-01-25 | 2013-07-31 | 三美电机株式会社 | Charge controller with protection function and battery pack |
| CN205430716U (en) * | 2015-09-29 | 2016-08-03 | 上海裕芯电子科技有限公司 | Built -in low -voltage protection's LED control circuit |
Non-Patent Citations (1)
| Title |
|---|
| 朱文龙: "一种反激式恒压恒流输出AC_DC开关电源芯片的设计", 《万方学位论文全文库》 * |
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| Publication number | Publication date |
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| CN107508270B (en) | 2019-04-09 |
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