CN204559089U - Power protecting circuit - Google Patents
Power protecting circuit Download PDFInfo
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- CN204559089U CN204559089U CN201520203411.0U CN201520203411U CN204559089U CN 204559089 U CN204559089 U CN 204559089U CN 201520203411 U CN201520203411 U CN 201520203411U CN 204559089 U CN204559089 U CN 204559089U
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- resistance
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- electric capacity
- protecting circuit
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Abstract
The utility model embodiment discloses a kind of power protecting circuit; comprise protect IC U1; be connected to the control pin of protect IC U1 and the switching tube U2 of protection branch road at the place that is turned on or off according to the control of protect IC U1; described power protecting circuit also comprises and is jointly series at described protection branch road with described switching tube U2; two ends are connected to the sensitive resistance RS of the measurement pin of protect IC U1, and protect IC U1 produces control signal according to measuring-signal.The utility model embodiment is by increasing sensitive resistance RS; test induction point is become the two ends of sensitive resistance RS from existing switching tube U2 two ends; when electric current is greater than overcurrent protection threshold values; protection branch road disconnects to be protected; thus it is accurate to reach overcurrent protection threshold values; fail safe is good, the technique effect that power source life is long.
Description
Technical field
The utility model relates to consumption electronic products field, particularly relates to a kind of power protecting circuit.
Background technology
Refer to Fig. 1, existing power protecting circuit, be measured by protection IC, voltage between compute switch pipe U2 pin S1 and pin S2 two ends, and compare and be confirmed whether overcurrent.It is actually internal resistance size by switching tube U2 to be defined flow valuve; but; switching tube U2 internal resistance change all greatly; have the change of 4m Ω or more at least, and switching tube U2 is along with the change of cell voltage, internal driving also occurs to change; cause the accuracy of overcurrent protection threshold values very poor; more than 6A even more than 8A, there is serious potential safety hazard, also shorten power source life in most overcurrent protection.
Utility model content
The utility model embodiment technical problem to be solved is, overcurrent protection threshold values is accurate, and fail safe is good, the power protecting circuit that power source life is long.
In order to solve the problems of the technologies described above; the utility model embodiment proposes a kind of power protecting circuit; comprise protect IC U1; be connected to the control pin of protect IC U1 and the switching tube U2 of protection branch road at the place that is turned on or off according to the control of protect IC U1; described power protecting circuit also comprises and is jointly series at described protection branch road with described switching tube U2; two ends are connected to the sensitive resistance RS of the measurement pin of protect IC U1, and protect IC U1 produces control signal according to measuring-signal.
Further; described sensitive resistance RS is one or more in piezo-resistance, thermistor, photo resistance, humistor, mistor and gas sensing resistance, and the pin of protect IC U1 is measured corresponding physical signalling and produced control signal when reaching reservation threshold.
Further, the measurement pin of protect IC U1 comprises pin VM and pin VSS, is connected to pin two and port B-that the pin one of sensitive resistance RS and the pin S2 of switching tube U2 and pin S2 ', pin VSS are connected to sensitive resistance RS after pin VM series resistance R2; The measurement pin of protect IC U1 comprises pin DO and pin CO, and pin DO is connected to the pin G2 of switching tube U2, and pin CO is connected to the pin G1 of switching tube U2.
Further, described power protecting circuit also comprises resistance R1, electric capacity C1, electric capacity C2A, electric capacity C2B, electric capacity C3, electric capacity C4 and resistance R3;
Wherein, the pin one of resistance R1 is connected to the pin one of port B+, port P+ and electric capacity C4, and pin two is connected to the pin one of electric capacity C1, the pin VDD of protect IC U1; Pin S1, the pin S1 ' of switching tube U2, the pin two of electric capacity C3, the pin two of resistance R3 and port P-is connected to after pin two series capacitance C2A, the electric capacity C2B of electric capacity C1; Port B+, the pin one of resistance R1 and port P+ is connected to after the pin one series capacitance C4 of electric capacity C3; The pin one of resistance R3 is connected to port NTC.
Further, described switching tube U2 is MOSFET.
Further, described power protecting circuit is integrated on the circuit board of a portable terminal device inside, and corresponding power is lithium battery.
The beneficial effect of the power protecting circuit of the utility model embodiment is: by increasing sensitive resistance RS; test induction point is become the two ends of sensitive resistance RS from existing switching tube U2 two ends; when electric current is greater than overcurrent protection threshold values; protection branch road disconnects to be protected; thus it is accurate to reach overcurrent protection threshold values; fail safe is good, the technique effect that power source life is long.
Accompanying drawing explanation
Fig. 1 is the power protecting circuit schematic diagram of prior art.
Fig. 2 is the power protecting circuit schematic diagram of the utility model embodiment.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can be combined with each other, and are described in further detail the utility model below in conjunction with the drawings and specific embodiments.
Please refer to Fig. 2; the utility model embodiment provides a kind of power protecting circuit; comprise protect IC U1; be connected to the control pin of protect IC U1 and the switching tube U2 of protection branch road at the place that is turned on or off according to the control of protect IC U1; described power protecting circuit also comprises and is jointly series at described protection branch road with described switching tube U2; two ends are connected to the sensitive resistance RS of the measurement pin of protect IC U1, and protect IC U1 produces control signal according to measuring-signal.
It will be understood by those skilled in the art that: protect IC U1 not only can pass through measuring voltage; calculating current also compares threshold values to produce control signal; the mode of the physical signalling such as measuring tempeature can also produce control signal; also be; described sensitive resistance RS is one or more in piezo-resistance, thermistor, photo resistance, humistor, mistor and gas sensing resistance, and the pin of protect IC U1 is measured corresponding physical signalling and produced control signal when reaching reservation threshold.The utility model embodiment is with described sensitive resistance RS for piezo-resistance, and by measuring voltage, comparing threshold values generation control signal after calculating current is that example is described.
The measurement pin of protect IC U1 comprises pin VM and pin VSS, is connected to pin two and port B-that the pin one of sensitive resistance RS and the pin S2 of switching tube U2 and pin S2 ', pin VSS are connected to sensitive resistance RS after pin VM series resistance R2; The measurement pin of protect IC U1 comprises pin DO and pin CO, and pin DO is connected to the pin G2 of switching tube U2, and pin CO is connected to the pin G1 of switching tube U2.
Described power protecting circuit also comprises resistance R1, electric capacity C1, electric capacity C2A, electric capacity C2B, electric capacity C3, electric capacity C4 and resistance R3;
Wherein, the pin one of resistance R1 is connected to the pin one of port B+, port P+ and electric capacity C4, and pin two is connected to the pin one of electric capacity C1, the pin VDD of protect IC U1; Pin S1, the pin S1 ' of switching tube U2, the pin two of electric capacity C3, the pin two of resistance R3 and port P-is connected to after pin two series capacitance C2A, the electric capacity C2B of electric capacity C1; Port B+, the pin one of resistance R1 and port P+ is connected to after the pin one series capacitance C4 of electric capacity C3; The pin one of resistance R3 is connected to port NTC.
Described switching tube U2 is MOSFET.
Described power protecting circuit is integrated on the circuit board of a portable terminal device inside, and corresponding power is lithium battery.Described portable terminal device is the consumption electronic products such as mobile phone, flat board.
Because measuring voltage scope is 120 millivolts ± 10 millivolts; the internal resistance excursion of switching tube U2 is 13 milliohm to 20 milliohms; the protective current constant interval that the power protecting circuit of prior art is corresponding is that 5.5 peaces to 10 are pacified, and constant interval is very large, and the utility model embodiment adopts sensitive resistance RS; control precision is made to reach 1%; Ohm's law V=IR, when V is a fixed value, if resistance R excursion is more little more accurate; the excursion of I also can be more little more accurate, and vice versa.As a kind of execution mode, sensitive resistance RS resistance is 20 milliohms, and corresponding protective current constant interval is that 5.5 peaces to 6 are pacified, and constant interval is very little, and controlled range is more accurate, and can be accurate to 1A, battery is safer.
The circuit board of the utility model embodiment is arranged sensitive resistance RS, make the filter effect of power protecting circuit better, reduce space loss, reach overcurrent protection threshold values accurate, fail safe is good simultaneously, the technique effect that power source life is long; The parameter of sensitive resistance RS can also be regulated as required to make overcurrent protection threshold values become more accurate, and to realize the demand of client to overcurrent protection threshold values, customer satisfaction is high.
The above is embodiment of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection range of the present utility model.
Claims (6)
1. a power protecting circuit; comprise protect IC U1; be connected to the control pin of protect IC U1 and the switching tube U2 of protection branch road at the place that is turned on or off according to the control of protect IC U1; it is characterized in that; described power protecting circuit also comprises and is jointly series at described protection branch road with described switching tube U2; two ends are connected to the sensitive resistance RS of the measurement pin of protect IC U1, and protect IC U1 produces control signal according to measuring-signal.
2. power protecting circuit as claimed in claim 1; it is characterized in that; described sensitive resistance RS is one or more in piezo-resistance, thermistor, photo resistance, humistor, mistor and gas sensing resistance, and the pin of protect IC U1 is measured corresponding physical signalling and produced control signal when reaching reservation threshold.
3. power protecting circuit as claimed in claim 1, it is characterized in that, the measurement pin of protect IC U1 comprises pin VM and pin VSS, pin two and port B-that the pin one of sensitive resistance RS and the pin S2 of switching tube U2 and pin S2 ', pin VSS are connected to sensitive resistance RS is connected to after pin VM series resistance R2; The measurement pin of protect IC U1 comprises pin DO and pin CO, and pin DO is connected to the pin G2 of switching tube U2, and pin CO is connected to the pin G1 of switching tube U2.
4. power protecting circuit as claimed in claim 3, it is characterized in that, described power protecting circuit also comprises resistance R1, electric capacity C1, electric capacity C2A, electric capacity C2B, electric capacity C3, electric capacity C4 and resistance R3;
Wherein, the pin one of resistance R1 is connected to the pin one of port B+, port P+ and electric capacity C4, and pin two is connected to the pin one of electric capacity C1, the pin VDD of protect IC U1; Pin S1, the pin S1 ' of switching tube U2, the pin two of electric capacity C3, the pin two of resistance R3 and port P-is connected to after pin two series capacitance C2A, the electric capacity C2B of electric capacity C1; Port B+, the pin one of resistance R1 and port P+ is connected to after the pin one series capacitance C4 of electric capacity C3; The pin one of resistance R3 is connected to port NTC.
5. power protecting circuit as claimed in claim 1, it is characterized in that, described switching tube U2 is MOSFET.
6. power protecting circuit as claimed in claim 1, it is characterized in that, described power protecting circuit is integrated on the circuit board of a portable terminal device inside, and corresponding power is lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520203411.0U CN204559089U (en) | 2015-04-07 | 2015-04-07 | Power protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520203411.0U CN204559089U (en) | 2015-04-07 | 2015-04-07 | Power protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204559089U true CN204559089U (en) | 2015-08-12 |
Family
ID=53834160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520203411.0U Expired - Fee Related CN204559089U (en) | 2015-04-07 | 2015-04-07 | Power protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204559089U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107091248A (en) * | 2017-07-07 | 2017-08-25 | 常州鱼尾科技有限公司 | Mini-size inflation pump shell structure and Mini-size inflation pump |
-
2015
- 2015-04-07 CN CN201520203411.0U patent/CN204559089U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107091248A (en) * | 2017-07-07 | 2017-08-25 | 常州鱼尾科技有限公司 | Mini-size inflation pump shell structure and Mini-size inflation pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150812 Termination date: 20180407 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |