CN211127202U - Input protection circuit of mobile power supply - Google Patents
Input protection circuit of mobile power supply Download PDFInfo
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- CN211127202U CN211127202U CN201922152058.9U CN201922152058U CN211127202U CN 211127202 U CN211127202 U CN 211127202U CN 201922152058 U CN201922152058 U CN 201922152058U CN 211127202 U CN211127202 U CN 211127202U
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- input
- switch tube
- electrically connected
- power supply
- resistor
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a portable power source input protection circuit, it is including the power input end that connects gradually, portable power source main control chip and power output end, the anodal and portable power source main control chip electricity of single cluster lithium cell are connected and are connected with switch tube Q1's control end electricity, switch tube Q1's input is connected with the power input end electricity, switch tube Q1's output is connected with switch tube Q2's control end electricity, switch tube Q2's output is connected with the negative pole end electricity of power input end, the negative pole of single cluster lithium cell is connected with switch tube Q2's input electricity, it has resistance R6 to be connected electrically between switch tube Q2's input and output; 5V direct current is input to the power input end. The utility model discloses the input of application main control chip and the anodal pressure differential of battery are as judging the condition, in case the main control chip short circuit, this pressure differential <0.4V, will directly turn off the input MOS. The control speed is fast and the cost is moderate.
Description
Technical Field
The utility model relates to a portable power source technical field, especially a portable power source input protection circuit.
Background
In a general mobile power supply with a built-in single-string battery, an input end of the mobile power supply is not provided with a separate protection circuit for preventing a main control core from being short-circuited, and when U L60950 certification is carried out, requirements are met in U L609504.3.8 Batteries, and the charging current cannot exceed the maximum value of a battery specification under the condition of single fault.
In order to pass through the terms, fuses or single chip microcomputers are generally adopted to control the 2 schemes in the market, but the fuse scheme causes users to be relieved, and the single chip microcomputer control scheme is too high in cost.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to above-mentioned prior art not enough, provide a portable power source input protection circuit.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is: a mobile power supply input protection circuit comprises a power supply input end, a mobile power supply main control chip and a power supply output end which are connected in sequence, wherein the anode of a single-string lithium battery is electrically connected with the mobile power supply main control chip and the control end of a switch tube Q1, the input end of the switch tube Q1 is electrically connected with the power supply input end, the output end of the switch tube Q1 is electrically connected with the control end of a switch tube Q2, the output end of the switch tube Q2 is electrically connected with the cathode end of the power supply input end, the cathode of the single-string lithium battery is electrically connected with the input end of a switch tube Q2, and a resistor R6 is electrically connected between the input end and the output end of a; the power input end inputs 5V direct current.
In the above technical solution, a resistor R3 is connected in series between the positive electrode of the single-string lithium battery and the control end of the switching tube Q1, a node between the resistor R3 and the control end of the switching tube Q1 is electrically connected to a resistor R4 and then grounded, and the resistance value of the resistor R4 is more than 10 times that of the resistor R3.
In the above technical solution, a resistor R5 is electrically connected between the output end and the control end of the switching tube Q2.
In the above technical solution, the switch Q1 and the switch Q2 are MOS transistors.
The utility model has the advantages that:
1) the differential pressure between the input end of the main control chip and the anode of the battery is used as a judgment condition, and once the main control chip is in short circuit, the differential pressure is less than 0.4V, and the input MOS is directly switched off. The control speed is fast and the cost is moderate.
2) The protection circuit has the advantages of simple structure, low cost, capability of realizing long-time repeated protection for multiple frequencies, high speed and no damage to the protection circuit.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a mobile power supply input protection circuit includes a power supply input terminal, a mobile power supply main control chip and a power supply output terminal which are connected in sequence, a positive electrode of a single-string lithium battery is electrically connected with the mobile power supply main control chip and is electrically connected with a control terminal of a MOS transistor Q1, an input terminal of the MOS transistor Q1 is electrically connected with the power supply input terminal, an output terminal of the MOS transistor Q1 is electrically connected with a control terminal of a MOS transistor Q2, an output terminal of the MOS transistor Q2 is electrically connected with a negative terminal of the power supply input terminal, a negative electrode of the single-string lithium battery is electrically connected with an input terminal of a MOS transistor Q2 through a lithium battery protection module, and a resistor R6 is electrically connected between the; the power input end inputs 5V direct current. A resistor R3 is connected in series between the anode of the single-string lithium battery and the control end of the MOS tube Q1, a node between the resistor R3 and the control end of the MOS tube Q1 is electrically connected with a resistor R4 and then grounded, and the resistance value of the resistor R4 is more than 10 times of that of the resistor R3. In this embodiment, the resistance of the resistor R3 is 100K ohms, the resistance of the resistor R4 is 1M ohms, and the resistance of the resistor R3 is much smaller than the resistance of the resistor R4. And a resistor R5 is electrically connected between the output end and the control end of the switching tube Q2.
The utility model discloses a focus lies in: the on and off of the MOS transistor Q1 is realized by the voltage difference between the input voltage 5V and the battery voltage, and the MOS transistor Q2 at the negative end is controlled by level conversion.
The utility model discloses the theory of operation:
the 5V direct current is accessed from the power supply input end.
Under the normal condition, lithium cell voltage is between 3~4.2V, MOS pipe Q1's 1 foot connects at the positive pole of lithium cell through resistance R3, input 5V is higher than the battery to 0.8V, portable power source main control chip normally charges the lithium cell, lithium cell voltage keeps between 3~4.2V, make MOS pipe Q1 switch on, high level is put to MOS pipe Q1's 3 feet, make MOS pipe Q2 switch on, the main power return circuit switch on, the electric current is through the input, portable power source main control chip, the battery, lithium electricity protection module, MOS pipe Q2 forms the charging circuit.
Under the abnormal condition, when the input end of the main control chip of the mobile power supply is in short circuit with the positive electrode of the lithium battery, the resistance value of the resistor R3 is far smaller than that of the resistor R4, 1 pin of the MOS transistor Q1 is approximately equal to the voltage of the lithium battery, the differential pressure of 1-2 pins of the MOS transistor Q1 is smaller than 0.4V, the MOS transistor Q1 is cut off, 3 pins of the MOS transistor Q1 are set to be at a low level, the MOS transistor Q2 is cut off, the main power loop is not connected, only a small current passes through the resistor R6, the small current is far smaller than the charging specification requirement of the lithium battery, and the input protection.
The above embodiments are merely illustrative and not restrictive, and all equivalent changes and modifications made by the methods described in the claims are intended to be included within the scope of the present invention.
Claims (4)
1. A kind of portable power source input protective circuit, characterized by: the portable lithium battery pack comprises a power supply input end, a portable power supply main control chip and a power supply output end which are sequentially connected, wherein the anode of a single-string lithium battery is electrically connected with the portable power supply main control chip and is electrically connected with the control end of a switch tube Q1, the input end of the switch tube Q1 is electrically connected with the power supply input end, the output end of the switch tube Q1 is electrically connected with the control end of a switch tube Q2, the output end of the switch tube Q2 is electrically connected with the cathode end of the power supply input end, the cathode of the single-string lithium battery is electrically connected with the input end of a switch tube Q2, and a resistor R6 is electrically connected; the power input end inputs 5V direct current.
2. The input protection circuit of claim 1, wherein: a resistor R3 is connected in series between the positive electrode of the single-string lithium battery and the control end of the switching tube Q1, a node between the resistor R3 and the control end of the switching tube Q1 is electrically connected with a resistor R4 and then grounded, and the resistance value of the resistor R4 is more than 10 times that of the resistor R3.
3. The input protection circuit of claim 1, wherein: and a resistor R5 is electrically connected between the output end and the control end of the switching tube Q2.
4. The input protection circuit of claim 1, wherein: the switch Q1 and the switch Q2 are MOS transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922152058.9U CN211127202U (en) | 2019-12-05 | 2019-12-05 | Input protection circuit of mobile power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922152058.9U CN211127202U (en) | 2019-12-05 | 2019-12-05 | Input protection circuit of mobile power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211127202U true CN211127202U (en) | 2020-07-28 |
Family
ID=71690791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922152058.9U Active CN211127202U (en) | 2019-12-05 | 2019-12-05 | Input protection circuit of mobile power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211127202U (en) |
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2019
- 2019-12-05 CN CN201922152058.9U patent/CN211127202U/en active Active
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