CN209250301U - A kind of battery charge/discharge protection circuit - Google Patents
A kind of battery charge/discharge protection circuit Download PDFInfo
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- CN209250301U CN209250301U CN201920001691.5U CN201920001691U CN209250301U CN 209250301 U CN209250301 U CN 209250301U CN 201920001691 U CN201920001691 U CN 201920001691U CN 209250301 U CN209250301 U CN 209250301U
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Abstract
The utility model relates to a kind of battery charge/discharge protection circuits.A kind of battery charge/discharge protection circuit, including a protective switch, primary protection IC circuit, electric tool motor and battery, second protection switch, second protection and overcurrent IC circuit, excess flow switch, overheat protector IC circuit；Protective switch is MOS switch pipe Q1, second protection switch is MOS switch pipe Q2, and battery management special chip U1 is provided in second protection and overcurrent IC circuit, detects cell voltage and over-discharge electric current；Battery management special chip U2 is set in primary protection IC circuit, detects cell voltage；It is provided with programmable MCU U3 in overheat protector IC circuit, detects battery temperature；U3 real-time monitoring battery temperature in charging process, U1 and U2 real-time detection cell voltage, U1 real-time detection cell voltage or the case where electric discharge overcurrent when electric discharge.The utility model line construction is simple, low in cost, can preferably protect battery, extends product service life, reduces market repair rate.
Description
Technical field
The utility model relates to power tool battery control field more particularly to a kind of battery charge/discharge protection circuits.
Background technique
Many electric tool products currently on the market, battery and tool are an entirety, and charge protection is single, has battery to fill
It is discontented with or does not have overdischarge, the defencive functions such as excess temperature can generate danger or over-discharge battery after overtemperature in charging, damage battery.
The general way of existing market, when detecting that battery is full of, the only primary charging of detection reaches full power state, just stops
Only charge the battery；In addition, temperature protection is not accurate enough when charging, also charge the battery at high temperature, there is damage battery and fill
The danger of quick-fried battery；And in electric discharge, under-voltage protection is inaccurate, there is the danger of overdischarge damage battery.
Summary of the invention
To the problems of the prior art, the utility model provides a kind of battery charge/discharge protection circuit.
In order to solve the above problem, the solution of the utility model is a kind of battery charge/discharge protection circuit, including primary
Protective switch, primary protection IC circuit, electric tool motor and battery, second protection switch, second protection and overcurrent IC circuit,
Excess flow switch, overheat protector IC circuit；
One end of protective switch connects power input INPUT, and the other end switchs with second protection respectively, is primary
Protection IC circuit, overheat protector IC circuit connects with one end of MCU, the other end that the second protection switchs respectively with electronic work
One end connection of the tool anode of motor, the anode of battery, second protection and overcurrent IC circuit, second protection and overcurrent IC circuit
The other end is connect with one end of the cathode of electric tool motor and excess flow switch respectively, the other end of the excess flow switch respectively with
Primary protection IC circuit, overheat protector IC circuit, the other end of MCU are connected with the cathode of battery；
Protective switch is MOS switch pipe Q1, second protection switch is MOS switch pipe Q2；
U1 is provided in the second protection and overcurrent IC circuit, the U1 is battery management special chip, for controlling,
Protection and real-time detection cell voltage and over-discharge electric current；
Be provided with U2 in the primary protection IC circuit, the U2 is battery management special chip, for controlling, protect and
Real-time detection cell voltage；
U3 is provided in the overheat protector IC circuit, the U3 is programmable MCU, for controlling, protecting and examine in real time
Survey battery temperature；
Charging current is filled followed by MOS switch pipe Q1, MOS switch pipe Q2 to battery from power input INPUT when charging
Electricity, the battery temperature of U3 real-time monitoring described in charging process, U1 the and U2 real-time detection cell voltage, total have carried out twice
Battery is full of detection.
As an improvement, further including MOS switch pipe Q4, the MOS switch pipe Q4 is arranged in second protection and overcurrent IC circuit
In, when electric discharge the U1 real-time detection cell voltage, the U1 also detects the electric current that MOS switch pipe Q4 flows through simultaneously, supervises in real time
The case where surveying under-voltage or electric discharge overcurrent plays protection galvanic action, institute once turning off Q4 to protection point U1 meeting sending signal
Stating protection point is the critical range value of the cell discharge voltage and discharge current that are arranged in U1 in advance.
As a further improvement, the cell discharge voltage critical range value is 4.25-5V.
As a further improvement, the battery discharge current critical range value is 28-30A.
From the above, it can be seen that the utility model line construction is simple, and it is low in cost, it can preferably protect electricity
Pond extends product service life, reduces market repair rate.
Detailed description of the invention
Fig. 1 is the principles of the present invention schematic diagram；
Fig. 2 is the physical circuit schematic diagram of the utility model；
Specific embodiment
First specific embodiment of the utility model is described in detail combined with Figure 1 and Figure 2, but not to the utility model
Claim does any restriction.
As depicted in figs. 1 and 2, a kind of battery charge/discharge protection circuit, including a protective switch, primary protection IC electricity
Road, electric tool motor and battery, second protection switch, second protection and overcurrent IC circuit, excess flow switch, overheat protector IC electricity
Road；
One end of protective switch connects power input INPUT, and the other end switchs with second protection respectively, is primary
Protection IC circuit, overheat protector IC circuit connects with one end of MCU, the other end that the second protection switchs respectively with electronic work
One end connection of the tool anode of motor, the anode of battery, second protection and overcurrent IC circuit, second protection and overcurrent IC circuit
The other end is connect with one end of the cathode of electric tool motor and excess flow switch respectively, the other end of the excess flow switch respectively with
Primary protection IC circuit, overheat protector IC circuit, the other end of MCU are connected with the cathode of battery；
Protective switch is MOS switch pipe Q1, second protection switch is MOS switch pipe Q2；
U1 is provided in the second protection and overcurrent IC circuit, the U1 is battery management special chip, for controlling,
Protection and real-time detection cell voltage and over-discharge electric current；
Be provided with U2 in the primary protection IC circuit, the U2 is battery management special chip, for controlling, protect and
Real-time detection cell voltage；
U3 is provided in the overheat protector IC circuit, the U3 is programmable MCU, for controlling, protecting and examine in real time
Survey battery temperature；
Charging current is filled followed by MOS switch pipe Q1, MOS switch pipe Q2 to battery from power input INPUT when charging
Electricity, the battery temperature of U3 real-time monitoring described in charging process, U1 the and U2 real-time detection cell voltage, total have carried out twice
Battery is full of detection.
More specifically, further including MOS switch pipe Q4, the MOS switch pipe Q4 is arranged in second protection and overcurrent IC circuit
In, when electric discharge the U1 real-time detection cell voltage, the U1 also detects the electric current that MOS switch pipe Q4 flows through simultaneously, supervises in real time
The case where surveying under-voltage or electric discharge overcurrent plays protection galvanic action, institute once turning off Q4 to protection point U1 meeting sending signal
Stating protection point is the critical range value of the cell discharge voltage and discharge current that are arranged in U1 in advance.
More specifically, the cell discharge voltage critical range value is 4.25-5V.
More specifically, the battery discharge current critical range value is 28-30A.
In Fig. 2 " B+2 ", " GND " is battery " just " respectively, and " negative " both ends, " Q1, Q2 " are that a second protection is opened respectively
It closes, U3 is control output and temperature protection MCU, and charging current warp: Q1, Q2 charge the battery, real-time monitoring electricity in charging process
Pond temperature；
U1, U2 real-time detection single battery voltage, real-time perfoming protection；
When electric discharge U1 real-time detection single battery voltage simultaneously, the also electric current that flows through of detection Q4, real-time perfoming under-voltage,
The monitoring for overcurrent of discharging plays protection galvanic action once turning off Q4 to protection point U1 meeting sending signal.
In conclusion the utility model line construction is simple, and it is low in cost, battery can be preferably protected, product is extended
Service life reduces market repair rate.
It is understood that being merely to illustrate the utility model above with respect to the specific descriptions of the utility model and not being
It is limited to technical solution described in the utility model embodiment, those skilled in the art should understand that, it is not departing from
It in the case where spirit and scope defined by claim, can modify to the utility model or equivalent replacement, to reach
Identical technical effect, but be within the protection scope of the utility model.
Claims (4)
1. a kind of battery charge/discharge protection circuit, including a protective switch, primary protection IC circuit, electric tool motor and electricity
Pond, it is characterised in that: further include second protection switch, second protection and overcurrent IC circuit, excess flow switch, overheat protector IC electricity
Road；
One end of protective switch connects power input INPUT, and the other end is protected with second protection switch, once respectively
IC circuit, overheat protector IC circuit are connected with one end of MCU, the other end of second protection switch respectively with electric tool horse
One end connection of the anode of the anode, battery that reach, second protection and overcurrent IC circuit, second protection and overcurrent IC circuit it is another
End is connect with one end of the cathode of electric tool motor and excess flow switch respectively, and the other end of the excess flow switch is respectively and once
Protection IC circuit, overheat protector IC circuit, the other end of MCU are connected with the cathode of battery；
Protective switch is MOS switch pipe Q1, second protection switch is MOS switch pipe Q2；
U1 is provided in the second protection and overcurrent IC circuit, the U1 is battery management special chip, for controlling, protecting
With real-time detection cell voltage and over-discharge electric current；
U2 is provided in the primary protection IC circuit, the U2 is battery management special chip, for controlling, protecting and in real time
Detect cell voltage；
It is provided with U3 in the overheat protector IC circuit, the U3 is programmable MCU, for controlling, protecting and real-time detection electricity
Pond temperature；
Charging current charges the battery from power input INPUT followed by MOS switch pipe Q1 and Q2 when charging, in charging process
The U3 real-time monitoring battery temperature, U1 the and U2 real-time detection cell voltage.
2. battery charge/discharge protection circuit according to claim 1, it is characterised in that: it further include MOS switch pipe Q4, it is described
MOS switch pipe Q4 is arranged in second protection and overcurrent IC circuit, when electric discharge the U1 real-time detection cell voltage, the U1 is also
The case where detecting the electric current that MOS switch pipe Q4 flows through, real-time monitoring under-voltage or electric discharge overcurrent simultaneously, once to protection point U1
Meeting sending signal turns off Q4, plays protection galvanic action, the protection point is the cell discharge voltage being arranged in U1 and electric discharge
The critical range value of electric current.
3. battery charge/discharge protection circuit according to claim 2, it is characterised in that: the critical model of cell discharge voltage
Enclosing value is 4.25-5V.
4. battery charge/discharge protection circuit according to claim 3, it is characterised in that: the critical model of battery discharge current
Enclosing value is 28-30A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920001691.5U CN209250301U (en) | 2019-01-02 | 2019-01-02 | A kind of battery charge/discharge protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920001691.5U CN209250301U (en) | 2019-01-02 | 2019-01-02 | A kind of battery charge/discharge protection circuit |
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| Publication Number | Publication Date |
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| CN209250301U true CN209250301U (en) | 2019-08-13 |
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| CN201920001691.5U Active CN209250301U (en) | 2019-01-02 | 2019-01-02 | A kind of battery charge/discharge protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109450053A (en) * | 2019-01-02 | 2019-03-08 | 张家港华捷电子有限公司 | A kind of battery charge/discharge protection circuit |
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2019
- 2019-01-02 CN CN201920001691.5U patent/CN209250301U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109450053A (en) * | 2019-01-02 | 2019-03-08 | 张家港华捷电子有限公司 | A kind of battery charge/discharge protection circuit |
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