CN208423857U - A kind of novel lithium battery switched charge power supply protection circuit - Google Patents
A kind of novel lithium battery switched charge power supply protection circuit Download PDFInfo
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- CN208423857U CN208423857U CN201821060800.2U CN201821060800U CN208423857U CN 208423857 U CN208423857 U CN 208423857U CN 201821060800 U CN201821060800 U CN 201821060800U CN 208423857 U CN208423857 U CN 208423857U
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Abstract
The utility model discloses a kind of novel lithium battery switched charge power supply protection circuits, including sequentially connected charging circuit, battery and power supply circuit, switch protecting circuit is connected between the battery and the first end of power supply circuit, the switch protecting circuit includes PMOS tube Q1, resistance R4, resistance R6 and diode D1, the drain electrode of the PMOS tube Q1 is connected to the anode of the battery, the source electrode of PMOS tube Q1 is connected to the positive terminal of the first end of the power supply circuit, the grid of PMOS tube Q1 is connected to the first end of the resistance R6, the second end of resistance R6 is grounded, the first end of the resistance R4 is connected to the positive terminal of the first end of the charging circuit, the second end of resistance R4 is connected to the first end of resistance R6, the anode of the diode D1 is connected to described The positive terminal of the first end of charging circuit, the cathode of diode D1 are connected to the positive terminal of the first end of the power supply circuit.
Description
Technical field
The utility model relates to power technique fields, and in particular to a kind of novel lithium battery switched charge power supply protection electricity
Road
Background technique
In intelligently wearing and beauty makeups field, portable electronic equipment is more and more extensive, and lithium battery is that its is most common
Power supply.But many equipment have the characteristics that one it is common be exactly not allow running equipment or not during charging
Allow the equipment that certain power consumption streams are big in running equipment, the reason is that electric current is very big, even greater than battery when certain heavy loads are run
Charging current, supply exceed demand for whole system in this case, and system is in imbalance state, by force run a period of time after can go out
Existing various exceptions: firstly, if load power consumption can be because the unexpected starting of load leads to charging chip when being much larger than charging current
Overcurrent enters protection, can not charge；Secondly, if when load power consumption is close to charging current, after system runs a period of time by force
For battery almost without electricity is deposited, even further decrease causes abnormal shutdown, crash etc. abnormal for a long time.Based on the above issues
Objective reality, limitation function or taboo when the lithium battery power supply equipment by USB charging of most of low capacity is provided with charging
The application being only switched on, i.e., while using while charge, therefore leverage user experience effect in practical applications.
It is exactly to increase a DC- in charging chip front end currently, also there is a kind of scheme for having the charge function when using
The power supply chip of DC is powered to the system (load) of rear end by DC-DC when accessing charging, is equivalent to two parallel confessions
Circuit, but it has the following disadvantages:
1. having newly increased the power supply branch of a DC-DC, circuit structure is complicated, and increased costs are excessive；
2. because will lead to there are two parallel powering branches, quiescent current is bigger than normal, and influence battery uses the time；
3. complex circuit designs need to introduce source of high frequency current, EMC is than more intractable.
Summary of the invention
The technical problem to be solved by the utility model is to provide a kind of novel lithium battery switched charge power supply protections
Circuit, the novel lithium battery switched charge power supply protection circuit have the function of charging when using, and low in cost.
In order to solve the above technical problems, the utility model uses technical solution as described below:
A kind of novel lithium battery switched charge power supply protection circuit, including charging circuit, battery and power supply circuit, it is described
The first end of charging circuit is connected to external dc power, and the second end of charging circuit is connected to the battery, the power supply electricity
The first end on road is connected to the battery, and the second end of power supply circuit is connected to load, and the first of the battery and power supply circuit
Switch protecting circuit is connected between end, the switch protecting circuit includes PMOS tube Q1, resistance R4, resistance R6 and diode
D1, the drain electrode of the PMOS tube Q1 are connected to the anode of the battery, and the source electrode of PMOS tube Q1 is connected to the power supply circuit
The positive terminal of first end, the grid of PMOS tube Q1 are connected to the first end of the resistance R6, and the second end ground connection of resistance R6 is described
The first end of resistance R4 is connected to the positive terminal of the first end of the charging circuit, and the second end of resistance R4 is connected to resistance R6's
First end, the anode of the diode D1 are connected to the positive terminal of the first end of the charging circuit, and the cathode of diode D1 connects
It is connected to the positive terminal of the first end of the power supply circuit.
The advantageous effects of the utility model are:
1) the utility model includes switch protecting circuit, and the PMOS tube of the switch protecting circuit is using transnormal anti-
To connection, in conjunction with PMOS tube diode-built-in and PN junction characteristic, so that charging circuit is independently separated with power supply circuit in charging,
Not only electricity supply load can be taken on series connection main road, but also charging circuit and battery can be carried out by the switching characteristic of PMOS tube
Protection realizes the function of charging when using, to thoroughly solve charging in industry and carry out various function restriction
Problem.
2) switch protecting circuit of the utility model electronic device common by PMOS tube, resistance, capacitor and diode etc.
Composition, parallel operation design compared with the existing technology, does not need to introduce high frequency electric source signal, thus circuit system is more steady
Fixed, cost is cheaper.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model embodiment.
Specific embodiment
To make those skilled in the art that the purpose of this utility model, technical solution and excellent be more clearly understood
Point is further elaborated the utility model below in conjunction with drawings and examples.
As shown in Figure 1, in one embodiment of the utility model, novel lithium battery switched charge power supply protection circuit
Including charging circuit 10, battery BT1, switch protecting circuit 20 and power supply circuit 30.Wherein, the first end of the charging circuit 10
It is connected to external dc power as power input, the second end of charging circuit 10 is connected to the battery BT1.The power supply
The first end of circuit 30 is connected to the battery BT1, and the second end of power supply circuit 30 is connected to the first of the power supply circuit 30
End, the second end of the power supply circuit 30 are connected to load as power output end.
In the present embodiment, the charging circuit 10 includes capacitor C1, charging management chip U2 and resistance R8, the charging
The model BL4054 of managing chip U2, the first end of the capacitor C1 are connected to the anode of the first end of the charging circuit 10
End, the second end ground connection of capacitor C1, the first end of the resistance R8 are connected to the PROG foot of the charging management chip U2, resistance
The second end of R8 is grounded, and the VCC foot of the charging management chip U2 is connected to the positive terminal of the first end of the charging circuit 10,
The GND foot of charging management chip U2 is grounded, and the BAT foot of charging management chip U2 is connected to the anode of the battery BT1.In addition,
The charging circuit 10 further includes a capacitor C5 for being used for filtering circuit clutter, and the first end of the capacitor C5 is connected to the electricity
The anode of pond BT1, the second end ground connection of capacitor C5.
In the present embodiment, the switch protecting circuit 20 includes PMOS tube Q1, resistance R4, resistance R6 and diode
D1, the drain electrode of the PMOS tube Q1 are connected to the anode of the battery BT1, and the source electrode of PMOS tube Q1 is connected to the power supply circuit
The positive terminal of 30 first end, the grid of PMOS tube Q1 are connected to the first end of the resistance R6, and the second end of resistance R6 is grounded,
The first end of the resistance R4 is connected to the positive terminal of the first end of the charging circuit 10, and the second end of resistance R4 is connected to electricity
The first end of R6 is hindered, the anode of the diode D1 is connected to the positive terminal of the first end of the charging circuit 10, diode D1
Cathode be connected to the power supply circuit 30 first end positive terminal.In addition, the switch protecting circuit 20 further includes useful
In the capacitor C6 and capacitor C3 of filtering circuit clutter, the first end of the capacitor C6 is connected to the first end of the resistance R6, electricity
Hold the second end ground connection of C6, the first end of the capacitor C3 is connected to the positive terminal of the first end of the power supply circuit 30, capacitor
The second end of C3 is grounded.
In the present embodiment, the power supply circuit 30 includes voltage regulator chip U1, the model of the voltage regulator chip U1
For BL8563-33PRA, the Vin foot and EN foot of the voltage regulator chip U1 are connected to the cathode of the diode D1, pressure stabilizing simultaneously
The GND foot of device chip U1 is grounded, and the Vout foot of voltage regulator chip U1 is connected to load positive terminal.In addition, the power supply circuit 30
It further include the capacitor C2 having for filtering circuit clutter, the capacitor C2 first end is connected to the Vout of the voltage regulator chip U1
Foot, capacitor C2 second end ground connection.
The working principle of the utility model is illustrated below:
When circuit does not access USB5V external dc power, the R6 in switch protecting circuit 20 is pulled down PMOS tube Q1
Grid potential drag down, drain source electrode between PN junction can be connected, battery BT1 be connected to the power supply circuit 30 rear end bear
Carry power supply；Simultaneously because the reversed connection of classics of PMOS tube Q1, internal diode can also power to backend load.
When circuit access USB5V external dc power is charged, USB5V external dc power can pass through front end first
Charging management chip U2 give battery BT1 charging.While charging, USB5V external dc power can pass through two pole of Schottky
Pipe D1 flows to the source electrode of PMOS tube Q1, to provide additional electric current as backend load power supply.The forward voltage drop of diode D1
Between 0.5-0.7V, so the voltage of node VB about 4.4V, i.e., the source voltage of PMOS tube Q1 about 4.4V at this time.Outside USB5V
Portion's DC power supply by the partial pressure filter circuit that is made of inside switch protecting circuit 20 resistance R4, resistance R6 and capacitor C6 to
The grid of PMOS tube Q1 provides the voltage of an about 5V*R6/ (R4+R6), the i.e. bias voltage of 4.2V.And battery BT1 is filling
General battery BT1 voltage is lower than 4.2V when electric, so the PN junction of PMOS tube Q1 can not be connected, and built-in the two of PMOS tube Q1 itself
Pole pipe can not also be connected because the voltage of its source electrode is higher than 4.2V.Therefore, entire PMOS tube Q1 is fully disconnected, and battery is complete
In charged state.
The beneficial effect of the utility model compared with prior art is:
1) the utility model includes switch protecting circuit, and the PMOS tube of the switch protecting circuit is using transnormal anti-
To connection, in conjunction with PMOS tube diode-built-in and PN junction characteristic, so that charging circuit is independently separated with power supply circuit in charging,
Not only can take on series connection main road and supply electricity to load supplying, but can by PMOS tube switching characteristic to charging circuit and battery into
Row protection, can guarantee the operation of each load stabilization, the function of charging when using be realized, to thoroughly solve in industry
Charge and carry out the problem of various function restriction.
2) switch protecting circuit of the utility model electronic device common by PMOS tube, resistance, capacitor and diode etc.
Composition, parallel operation design compared with the existing technology, does not need to introduce high frequency electric source signal, thus circuit system is more steady
Fixed, cost is cheaper.
The above is only the preferred embodiment of the present invention, rather than does limit in any form to the utility model
System.Those skilled in the art can impose various equivalent changes and improvement on the basis of the above embodiments, all to want in right
The equivalent variations or modification done in range are sought, should fall within the protection scope of this utility model.
Claims (7)
1. a kind of novel lithium battery switched charge power supply protection circuit, including charging circuit, battery and power supply circuit, described to fill
The first end of circuit is connected to external dc power, and the second end of charging circuit is connected to the battery, the power supply circuit
First end be connected to the battery, the second end of power supply circuit is connected to load, it is characterised in that: the battery and power supply electricity
Switch protecting circuit is connected between the first end on road, the switch protecting circuit includes PMOS tube Q1, resistance R4, resistance R6
With diode D1, the drain electrode of the PMOS tube Q1 is connected to the anode of the battery, and the source electrode of PMOS tube Q1 is connected to the confession
The positive terminal of the first end of circuit, the grid of PMOS tube Q1 are connected to the first end of the resistance R6, the second end of resistance R6
Ground connection, the first end of the resistance R4 are connected to the positive terminal of the first end of the charging circuit, the second end connection of resistance R4
In the first end of resistance R6, the anode of the diode D1 is connected to the positive terminal of the first end of the charging circuit, diode
The cathode of D1 is connected to the positive terminal of the first end of the power supply circuit.
2. novel lithium battery switched charge power supply protection circuit as described in claim 1, it is characterised in that: the switch is protected
Protection circuit further includes having capacitor C6, and the first end of the capacitor C6 is connected to the first end of the resistance R6, and the second of capacitor C6
End ground connection.
3. novel lithium battery switched charge power supply protection circuit as claimed in claim 2, it is characterised in that: the switch is protected
Protection circuit further includes having capacitor C3, and the first end of the capacitor C3 is connected to the positive terminal of the first end of the power supply circuit, electricity
Hold the second end ground connection of C3.
4. novel lithium battery switched charge power supply protection circuit as described in claim 1, it is characterised in that: the charging electricity
Road includes the model BL4054 of capacitor C1, charging management chip U2 and resistance R8, the charging management chip U2, the capacitor
The first end of C1 is connected to the positive terminal of the first end of the charging circuit, and the second end of capacitor C1 is grounded, the resistance R8's
First end is connected to the PROG foot of the charging management chip U2, the second end ground connection of resistance R8, the charging management chip U2
VCC foot be connected to the charging circuit first end positive terminal, charging management chip U2 GND foot ground connection, Charge Management
The BAT foot of chip U2 is connected to the anode of the battery.
5. novel lithium battery switched charge power supply protection circuit as claimed in claim 4, it is characterised in that: the charging electricity
Road further includes capacitor C5, and the first end of the capacitor C5 is connected to the anode of the battery, the second end ground connection of capacitor C5.
6. novel lithium battery switched charge power supply protection circuit as described in claim 1, it is characterised in that: the power supply electricity
Road includes voltage regulator chip U1, the model BL8563-33PRA of the voltage regulator chip U1, the voltage regulator chip U1's
Vin foot and EN foot are connected to the cathode of the diode D1, and the GND foot of voltage regulator chip U1 is grounded, voltage regulator chip U1's
Vout foot is connected to load positive terminal.
7. novel lithium battery switched charge power supply protection circuit as claimed in claim 6, it is characterised in that: the power supply electricity
Road further includes having capacitor C2, and the capacitor C2 first end is connected to the Vout foot of the voltage regulator chip U1, capacitor C2 second end
Ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821060800.2U CN208423857U (en) | 2018-07-05 | 2018-07-05 | A kind of novel lithium battery switched charge power supply protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821060800.2U CN208423857U (en) | 2018-07-05 | 2018-07-05 | A kind of novel lithium battery switched charge power supply protection circuit |
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| Publication Number | Publication Date |
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| CN208423857U true CN208423857U (en) | 2019-01-22 |
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|---|---|---|---|
| CN201821060800.2U Active CN208423857U (en) | 2018-07-05 | 2018-07-05 | A kind of novel lithium battery switched charge power supply protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110279514A (en) * | 2019-07-31 | 2019-09-27 | 郑州福盛康眼科医疗技术有限公司 | A kind of eye atomizer and its control circuit |
-
2018
- 2018-07-05 CN CN201821060800.2U patent/CN208423857U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110279514A (en) * | 2019-07-31 | 2019-09-27 | 郑州福盛康眼科医疗技术有限公司 | A kind of eye atomizer and its control circuit |
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Address after: B901 and b906, innovation Plaza, No. 2007, Pingshan Avenue, Liulian community, Pingshan street, Pingshan District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Intelligent Technology Co., Ltd. Address before: 518055 Guangdong city of Shenzhen province Nanshan District Xili Street Nanshan Chi Park building A7 503-A Patentee before: Shenzhen Intelligent Technology Co., Ltd. |