CN2919648Y - Battery charging controlling circuit - Google Patents
Battery charging controlling circuit Download PDFInfo
- Publication number
- CN2919648Y CN2919648Y CN 200620016979 CN200620016979U CN2919648Y CN 2919648 Y CN2919648 Y CN 2919648Y CN 200620016979 CN200620016979 CN 200620016979 CN 200620016979 U CN200620016979 U CN 200620016979U CN 2919648 Y CN2919648 Y CN 2919648Y
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- circuit
- resistance
- battery
- control circuit
- mcu
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Abstract
The unity model relates to a battery charging control circuit, including a MCU intelligent circuit (11), a DC/DC constant current converting circuit(13), a voltage sampling circuit(14), and a current feedback circuit(15). The unity model controls the charging current and charging cutoff conditions by MCU, can accurately resolve the battery state, cut off promptly the charging current and use the low current to supplement the charging for the full battery, practice high current to supplement the charging after battery voltage rising to a normal value for low voltage battery precharge(pulse charge), can protect the battery more effectively by accurate control, and prolong its working life. Meanwhile, it saved PWM special chip and saved the circuit cost.
Description
[technical field]
The utility model relates to the circuit that is used for battery charge control.
[background technology]
In daily life, along with digital camera, the extensive utilization of portable type electronic products such as mp3, strengthened the demand of various charger, at present, common charger on the market, please refer to shown in Figure 1, it adopts hardware controls, and battery charge control special chip or comparison circuit are judged battery according to voltage sampling signal, provide charging control signal then, make dedicated PWM chip output pwm signal control switch pipe output current, simultaneously, the dedicated PWM chip is adjusted pwm signal according to current feedback signal, thereby adjusts the size of output current.Be full of when battery charge control special chip or comparison circuit go out battery according to the sampled voltage input, then export charging control signal, make the dedicated PWM chip stop pwm signal output, thereby stop charging current output, complete charge.This control circuit is less to the protection of battery; charging cut-off condition error in judgement is big; can not effectively implement defencive function to battery; shortened the ordinary life of battery; in addition; at the battery of voltage (of a specified duration excessively, overdischarge of resting period) on the low side, directly, damage battery easily with bigger current charges.
[summary of the invention]
The purpose of this utility model is exactly in order to overcome the above problems, and a kind of battery charge control circuit is provided, and this circuit to battery charge control accurately, efficiently can effectively be protected battery.
For this reason, the utility model proposes a kind of battery charge control circuit, comprise MCU intelligence control circuit, DC/DC constant current change-over circuit, voltage sampling circuit, current feedback circuit; Described voltage sampling circuit input is used to connect rechargeable battery, and output is connected with described MCU intelligence control circuit; Described current feedback circuit input is connected with described DC/DC constant current change-over circuit output, and output is connected with described MCU intelligence control circuit; The control signal end of described DC/DC constant current change-over circuit is connected with described MCU intelligence control circuit.
Above-mentioned battery charge control circuit also comprises the MCU power circuit, is connected with described MCU intelligence control circuit.
Above-mentioned battery charge control circuit, described current feedback circuit comprises the 9th resistance, the tenth resistance, the 6th electric capacity, connect with described the 9th resistance after described the tenth resistance, the 6th electric capacity parallel connection, described the tenth resistance, the 6th electric capacity connect end altogether and are connected with described MCU intelligence control circuit.Described voltage sampling circuit comprises the 5th electric capacity, the 6th resistance, the 7th resistance, the 8th resistance, described the 5th electric capacity, the series connection of the 6th resistance, described the 7th resistance, the series connection of the 8th resistance, the series arm that described the 5th electric capacity, the 6th resistance constitute is parallel to described the 8th resistance two ends; Described the 5th electric capacity, the 6th resistance contact altogether are connected with described MCU intelligence control circuit.
Owing to adopted above scheme; the utility model is by MCU Based Intelligent Control charging current and charging cut-off condition; can accurately judge battery status; for the battery that is full of; in time turn-off charging current; and implement little electric current boost charge; carry out precharge (pulse current charge) for A-battery, treat that cell voltage rises to normal value, carry out large current charge again; by accurate, intelligent control; more effectively implement protection, prolonged the useful life of battery, simultaneously battery; save the PWM special chip, saved circuit cost.
[description of drawings]
Fig. 1 is the schematic diagram of prior art charging control circuit.
Fig. 2 is a schematic block circuit diagram of the present utility model.
Fig. 3 is the circuit theory diagrams of the utility model embodiment.
Fig. 4 is a charging control flow chart of the present utility model.
[embodiment]
Also the present invention is described in further detail in conjunction with the accompanying drawings below by specific embodiment.
Fig. 3 has represented the circuit diagram of the utility model preference.Charging control circuit comprises: MCU intelligence control circuit 11, MCU power circuit 12, DC/DC constant current change-over circuit 13, battery voltage sampling circuit 14, current feedback circuit 15.
MCU power circuit 12: comprise voltage stabilizing chip U1, triode Q4 and resistance composition, convert the input dc voltage to 3.3V voltage that MCU works.
DC/DC constant current change-over circuit 13: comprise switching tube Q1 and inductance L 1, this circuit is converted to the constant current that charges the battery by the pwm signal control that MCU provides with the dc voltage of importing, and size of current is controlled by pwm signal.
MCU intelligence control circuit 11:MCU intelligence control circuit is made up of MCU, resistance, electric capacity and LED.What the 4th pin of MCU U2 was exported is the pwm signal of control battery charge, and what the 5th pin was exported is the LED control signal, and the 7th pin is a current feedback signal, and the 6th pin is the battery voltage sampling signal.MCU controls the size of battery charging state and charging current by sampling, calculating to cell voltage and electric current, and indicates by LED.
Battery voltage sampling circuit 14: the battery voltage sampling circuit comprises the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8 and the 5th capacitor C 5, as shown in Figure 3, the 7th resistance R 7, the 8th resistance R 8 are connected in series between DC/DC constant current change-over circuit 13 outputs and the ground, what the 6th resistance R 6 one ends were connected in the 7th resistance R 7, the 8th resistance R 8 connects end altogether, the 6th pin of the other end and MCU U2, the 5th capacitor C 5 one ends connect altogether, the 5th capacitor C 5 other end ground connection.This circuit feeds back to MCU by the voltage sampling of resistance with cell voltage.
Current feedback circuit 15: current feedback circuit is made up of the 9th resistance R 9, the tenth resistance R 10 and the 6th capacitor C 6, the 9th resistance R 9 one ends and the tenth resistance R 10 1 ends are connected to current output terminal altogether, the 9th resistance R 9 other end ground connection, the 7th pin of the tenth resistance R 10 other ends and the 6th capacitor C 6 one ends, MCU U2 connects altogether, the 6th capacitor C 6 other end ground connection.This circuit is used for current signal is fed back to MCU.
Operation principle please refer to shown in Figure 2, load onto battery 16 after, MCU judges battery according to voltage sampling signal, output pwm signal control switch pipe output current then, simultaneously, MCU adjusts pwm signal according to current feedback signal, thereby adjusts the size of output current.Be full of when MCU goes out battery according to the sampled voltage calculated signals, then stop pwm signal output, thereby stop charging current output, complete charge.
Workflow please refer to shown in Figure 4:
When adding input DC power supply, the MCU power circuit is converted to the MCU operating voltage with input voltage, and MCU starts working.
MCU samples to battery by the battery voltage sampling circuit, does not have battery if A judges, output pwm signal not then, and making output current is 0, the LED indicating status is not for there being battery simultaneously; If it is low-voltage battery that B judges, then, battery is carried out precharge by pwm signal control DC/DC constant current change-over circuit output small-pulse effect electric current, recover normal until its voltage; If C judges normal battery is arranged, then carry out large current charge, LED is designated as and charges normal simultaneously.
During charging, MCU adjusts the duty ratio of pwm signal according to the current feedback value, thereby adjusts the current value of charging current for setting.
Charge normal in the process, MCU samples to cell voltage by the battery voltage sampling circuit, reaches but when being not limited to following any condition complete charge:
Cell voltage reaches the maximum of setting;
-Δ V reaches set point;
Charging interval reaches the maximum of setting;
Limit value according to other battery behaviors settings.
When battery was full of, MCU adjusted pwm signal, output boost charge electric current, and LED is designated as and is full of simultaneously.
By MCU control charging, because software has more flexibility than hardware circuit, applicability is more extensive.For example: give the battery charge of different joint numbers, need connect different hardware control circuits; Use MCU then only to need the change software program to get final product.
In sum, the utility model discloses a kind of intelligent battery charger control circuit,, and can carry out precharge A-battery by MCU Based Intelligent Control charging current and charging cut-off condition, thereby improved the useful life of battery greatly, and saved the cost of circuit.
Claims (4)
1, a kind of battery charge control circuit is characterized in that: comprise MCU intelligence control circuit (11), DC/DC constant current change-over circuit (13), voltage sampling circuit (14), current feedback circuit (15); Described voltage sampling circuit input connects rechargeable battery, and output is connected with described MCU intelligence control circuit (11); Described current feedback circuit (15) input is connected with described DC/DC constant current change-over circuit (13) output, and output is connected with described MCU intelligence control circuit (11); The control signal end of described DC/DC constant current change-over circuit (13) is connected with described MCU intelligence control circuit (11).
2, battery charge control circuit as claimed in claim 1 is characterized in that: also comprise MCU power circuit (12), be connected with described MCU intelligence control circuit (11).
3, battery charge control circuit as claimed in claim 1, it is characterized in that: described current feedback circuit (15) comprises the 9th resistance (R9), the tenth resistance (R10), the 6th electric capacity (C6), connect with described the 9th resistance (R9) in described the tenth resistance (R10), the 6th electric capacity (C6) back in parallel, described the tenth resistance (R10), the 6th electric capacity (C6) connect end altogether and is connected with described MCU intelligence control circuit (11).
4, battery charge control circuit as claimed in claim 1, it is characterized in that: described voltage sampling circuit (14) comprises the 5th electric capacity (C5), the 6th resistance (R6), the 7th resistance (R7), the 8th resistance (R8), described the 5th electric capacity (C5), the 6th resistance (R6) series connection, described the 7th resistance (R7), the 8th resistance (R8) series connection, the series arm that described the 5th electric capacity (C5), the 6th resistance (R6) constitute is parallel to described the 8th resistance (R8) two ends; Described the 5th electric capacity (C5), the 6th resistance (R6) contact altogether are connected with described MCU intelligence control circuit (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620016979 CN2919648Y (en) | 2006-07-12 | 2006-07-12 | Battery charging controlling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620016979 CN2919648Y (en) | 2006-07-12 | 2006-07-12 | Battery charging controlling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2919648Y true CN2919648Y (en) | 2007-07-04 |
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ID=38217468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620016979 Expired - Lifetime CN2919648Y (en) | 2006-07-12 | 2006-07-12 | Battery charging controlling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2919648Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101752883A (en) * | 2008-12-04 | 2010-06-23 | 深圳迈瑞生物医疗电子股份有限公司 | Charging circuit, medical facility and charging method |
| CN101854067A (en) * | 2009-04-01 | 2010-10-06 | 深圳富泰宏精密工业有限公司 | Electronic device and safe charging method thereof |
| CN103580082A (en) * | 2012-08-06 | 2014-02-12 | 海洋王照明科技股份有限公司 | Charging device |
| CN104158246A (en) * | 2014-08-11 | 2014-11-19 | 国家电网公司 | Wind power storage operation control method |
| CN106253417A (en) * | 2016-10-18 | 2016-12-21 | 江苏联通动力电池驱动系统有限公司 | A kind of double loop redundancy active equalization battery management system and control method thereof |
| CN107681464A (en) * | 2017-09-01 | 2018-02-09 | 歌尔股份有限公司 | A kind of power circuit |
-
2006
- 2006-07-12 CN CN 200620016979 patent/CN2919648Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101752883A (en) * | 2008-12-04 | 2010-06-23 | 深圳迈瑞生物医疗电子股份有限公司 | Charging circuit, medical facility and charging method |
| CN101752883B (en) * | 2008-12-04 | 2013-10-23 | 深圳迈瑞生物医疗电子股份有限公司 | Charging circuit, medical facility and charging method |
| CN101854067A (en) * | 2009-04-01 | 2010-10-06 | 深圳富泰宏精密工业有限公司 | Electronic device and safe charging method thereof |
| CN103580082A (en) * | 2012-08-06 | 2014-02-12 | 海洋王照明科技股份有限公司 | Charging device |
| CN104158246A (en) * | 2014-08-11 | 2014-11-19 | 国家电网公司 | Wind power storage operation control method |
| CN106253417A (en) * | 2016-10-18 | 2016-12-21 | 江苏联通动力电池驱动系统有限公司 | A kind of double loop redundancy active equalization battery management system and control method thereof |
| CN107681464A (en) * | 2017-09-01 | 2018-02-09 | 歌尔股份有限公司 | A kind of power circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20070704 |
|
| EXPY | Termination of patent right or utility model |