CN216390546U - Charging protection circuit of mobile power supply - Google Patents
Charging protection circuit of mobile power supply Download PDFInfo
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- CN216390546U CN216390546U CN202122169043.0U CN202122169043U CN216390546U CN 216390546 U CN216390546 U CN 216390546U CN 202122169043 U CN202122169043 U CN 202122169043U CN 216390546 U CN216390546 U CN 216390546U
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Abstract
The utility model discloses a mobile power supply charging protection circuit, which comprises a reference voltage module and a temperature control module for preventing the charging temperature of a mobile power supply from being overhigh, wherein the temperature control module comprises a comparator chip IC1, a thermistor TH, an MOS tube Q1, a triode Q2 and a resistor R0, the positive end and the negative end of the comparator chip IC1 are respectively connected to the output end of the reference voltage module, the thermistor TH is connected between one end of the comparator chip IC1 and the reference voltage module, the MOS tube Q1 is connected between the positive pole V + of the power input end and the positive pole C + of the power output end, the base of the triode Q2 is connected with the output end of the comparator chip IC1, the emitter is grounded, the collector is connected to the grid of the MOS tube Q1 and the resistor R0 and is connected to the positive pole V + of the power input end through the other end of the resistor R0, and when the charging temperature is overhigh, the MOS tube Q1 is cut off from the triode Q2, the charging is disconnected. The utility model can prevent the temperature of the mobile power supply from being overhigh during charging and reduce the potential safety hazard of the mobile power supply.
Description
Technical Field
The utility model relates to the technical field of mobile power supply charging, in particular to a mobile power supply charging protection circuit.
Background
The portable power source is also called as a mobile power source, a charger, and the like, is a portable charger which can be carried about by a person, can store electric energy by itself, is mainly used for charging consumer electronic products (such as a wireless phone and a notebook computer) such as handheld mobile equipment, and is particularly applied to occasions without external power supply. With the rise of electronic products such as smart phones, mobile power supplies are becoming more and more necessities of people's life, but some potential safety hazards still exist in the middle of the use of the existing mobile power supplies.
For example, in the process of charging the mobile power supply, the mobile power supply generates heat, and when the heating temperature is too high, violent combustion may be caused, thus endangering the use safety of consumers. In addition, there is also a problem of overcharge, and overcharge of the portable power source easily causes an increase in internal pressure of the internal battery, deformation of the battery, leakage of liquid, and the like, and the performance of the battery is significantly reduced and damaged.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a mobile power supply charging protection circuit to prevent the charging temperature from being overheated.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
a mobile power supply charging protection circuit comprises a reference voltage module and a temperature control module for preventing the charging temperature of a mobile power supply from being overhigh, the temperature control module comprises a comparator chip IC1, a thermistor TH, a MOS transistor Q1, a triode Q2 and a resistor R0, the positive and negative terminals of the comparator chip IC1 are connected to the reference voltage module output terminals, the thermistor TH is connected between one end of the thermistor and the reference voltage module, the MOS transistor Q1 is connected between the positive pole V + of the power input end and the positive pole C + of the power output end, the base electrode of the triode Q2 is connected with the output end of the comparator chip IC1, the emitter electrode is grounded, the collector electrode is connected with the grid electrode of the MOS transistor Q1 and the resistor R0, and is connected with the anode V + of the power supply input end through the other end of the resistor R0, when the charging temperature is too high, the MOS transistor Q1 and the triode Q2 are cut off, and the charging is disconnected.
Furthermore, the collector of the triode Q2 is connected to a resistor R0 and the gate of the MOS transistor Q1 via a resistor R1, a bias resistor R2 is connected in parallel between the base and the emitter, and a current-limiting resistor R3 is connected in series between the base and the output end of the comparator chip IC 1.
Further, the positive power pin of the comparator chip IC1 is connected to the positive V + of the power input terminal via a current limiting resistor R4, and the negative power pin is grounded.
Further, the positive terminal of the comparator chip IC1 is connected to the output terminal of the reference voltage module via the thermistor TH and the resistor R5, and the negative terminal is connected to the output terminal of the reference voltage module via the pull-up resistor R6 and is grounded via the pull-down resistor R7.
Further, the charging display module is used for displaying whether charging is finished or not, the charging display module comprises a comparator chip IC2, a triode Q3, a light emitting diode LED1 used for indicating a charging state, a light emitting diode LED2 used for indicating charging completion, a sampling resistor R8, a sampling resistor R9, a sampling resistor R10 and a sampling resistor R11, the negative end of the comparator chip IC2 is respectively connected with the sampling resistor R8 and the sampling resistor R9, the other end of the sampling resistor R8 is connected to the output end of the reference voltage module, the other end of the sampling resistor R9 is connected to the negative pole V-of the power input end, one end of the sampling resistor R10 is connected with the negative pole V-of the power input end, the other end of the sampling resistor R10 is connected with the negative pole C-of the power output end and the positive pole of the comparator chip IC2, the sampling resistor R11 is connected with the two ends of the sampling resistor R10 in parallel, the base electrode of the triode Q3 is connected with the output end of the comparator chip IC2, the collector electrode of the triode Q3 is connected with the positive electrode V + of the power input end, the emitter electrode of the triode Q3 is grounded, a light-emitting diode LED1 is connected between the collector electrode and the emitter electrode of the triode Q3 in parallel, the positive electrode of the light-emitting diode LED2 is connected to the output end of the comparator chip IC2, and the negative electrode of the light-emitting diode LED2 is connected to the emitter electrode of the triode Q3.
Furthermore, a current limiting resistor R12 is connected in series between the collector of the triode Q3 and the positive electrode V + of the power input end, and a current limiting resistor R13 is connected in series between the LED2 and the output end of the comparator chip IC 2.
Furthermore, a current limiting resistor R14 is connected in series between the base of the triode Q3 and the output end of the comparator chip IC2, and a bias resistor R15 is connected in parallel between the base and the emitter.
Further, the capacitor C1 is included, and the capacitor C1 is connected in parallel with the negative terminal and the output terminal of the comparator chip IC 2.
Further, the reference voltage module comprises a voltage regulator tube U1 and a current-limiting resistor R16, wherein the output end of the voltage regulator tube U1 is connected with the positive electrode V + of the power input end through the current-limiting resistor R16, the input end is connected with the negative electrode V-and the ground end of the power input end, and the adjusting end is in short circuit with the output end.
Further, the MOS transistor Q1 is a PMOS transistor, and the transistor Q2 and the transistor Q3 are NPN transistors.
The utility model has the following beneficial effects: 1. the temperature protection function is provided, the temperature change condition of the mobile power supply during charging can be detected and judged by using the thermistor TH, the high frequency and the low frequency output by the comparator chip IC1 are used for controlling the on-off of the triode Q2, the working state of the triode Q2 directly influences the on-off of the MOS tube Q1, when the charging temperature is too high, the triode Q2 is cut off, the MOS tube Q1 is closed, the charging can be cut off in time, the mobile power supply is prevented from being overheated and causing combustion, and the potential safety hazard of the mobile power supply during use is small; 2. the charging display module is arranged, so that the charging state of the mobile power supply can be visually presented, a user can timely stop charging after charging is completed, and the occurrence of an overcharging condition is reduced.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Description of the main component symbols: 1. a reference voltage module; 2. a temperature control module; 3. and a charging display module.
Detailed Description
The utility model is further described with reference to the following drawings and detailed description.
As shown in fig. 1, the charging protection circuit for a mobile power supply includes a reference voltage module 1 and a temperature control module 2 for preventing the charging temperature of the mobile power supply from being too high, the temperature control module 2 includes a comparator chip IC1, a thermistor TH, a MOS transistor Q1, a transistor Q2 and a resistor R0, a positive terminal and a negative terminal of the comparator chip IC1 are respectively connected to an output terminal of the reference voltage module 1, the thermistor TH is connected between one end of the thermistor and the reference voltage module 1, the MOS transistor Q1 is connected between the positive electrode V + of the power input end and the positive electrode C + of the power output end, the base electrode of the triode Q2 is connected with the output end of the comparator chip IC1, the emitter electrode is grounded, the collector electrode is connected with the grid electrode of the MOS transistor Q1 and the resistor R0, and the other end of the resistor R0 is connected to the positive electrode V + of the power supply input end, when the charging temperature is too high, the MOS tube Q1 and the triode Q2 are cut off, and the charging is disconnected.
The collector of the triode Q2 is connected to the resistor R0 and the gate of the MOS transistor Q1 through the resistor R1, a bias resistor R2 is connected in parallel between the base and the emitter, and a current-limiting resistor R3 is connected in series between the base and the output end of the comparator chip IC 1. The positive power pin of the comparator chip IC1 is connected to the positive V + of the power input terminal via a current limiting resistor R4, and the negative power pin is grounded. The positive terminal of the comparator chip IC1 is connected to the output terminal of the reference voltage module 1 via the thermistor TH and the resistor R5, and the negative terminal is connected to the output terminal of the reference voltage module 1 via the pull-up resistor R6 and is grounded via the pull-down resistor R7.
The charging display module 3 is used for displaying whether charging is finished or not, the charging display module 3 comprises a comparator chip IC2, a triode Q3, a light emitting diode LED1 used for indicating the charging state, a light emitting diode LED2 used for indicating charging completion, a sampling resistor R8, a sampling resistor R9, a sampling resistor R10 and a sampling resistor R11, the negative end of the comparator chip IC2 is respectively connected with the sampling resistor R8 and the sampling resistor R9, the other end of the sampling resistor R8 is connected to the output end of the reference voltage module 1, the other end of the sampling resistor R9 is connected to the negative pole V of the power input end, one end of the sampling resistor R10 is connected with the negative pole V-of the power input end, the other end of the power output end is connected with the negative pole C-and the positive end of the comparator chip IC2, the sampling resistor R11 is connected with the two ends of the sampling resistor R10, the base of the triode Q3 is connected with the output end of the comparator chip IC2, the collector is connected with the positive electrode V + of the power input end, the emitter is grounded, a light-emitting diode LED1 is connected between the collector and the emitter of the triode Q3 in parallel, the positive electrode of the light-emitting diode LED2 is connected to the output end of the comparator chip IC2, and the negative electrode of the light-emitting diode LED2 is connected to the emitter of the triode Q3.
A current limiting resistor R12 is connected in series between the collector of the triode Q3 and the positive electrode V + of the power input end, and a current limiting resistor R13 is connected in series between the light-emitting diode LED2 and the output end of the comparator chip IC 2. A current limiting resistor R14 is connected in series between the base of the triode Q3 and the output end of the comparator chip IC2, and a bias resistor R15 is connected in parallel between the base and the emitter. Also included is a capacitor C1, a capacitor C1 coupled in parallel to the negative and output terminals of the comparator chip IC 2. The reference voltage module 1 comprises a voltage regulator tube U1 and a current-limiting resistor R16, wherein the output end of the voltage regulator tube U1 is connected with the positive pole V + of the power input end through the current-limiting resistor R16, the input end is connected with the negative pole V-of the power input end, the ground end, and the adjusting end is in short circuit with the output end. The MOS transistor Q1 is a PMOS transistor, and the transistor Q2 and the transistor Q3 are NPN transistors.
When the MOS transistor Q1 is a PMOS transistor and the transistor Q2 and the transistor Q3 are both NPN transistors, in the process of charging the mobile power supply for the temperature control module 2, the external power supply outputs a reference voltage through the voltage regulator U1, and the reference voltage outputs a temperature reference voltage to the negative terminal of the comparator chip IC1 under the action of the pull-up resistor R6 and the pull-down resistor R7. When the temperature of the mobile power supply rises, the resistance value of the thermistor TH changes along with the temperature rise, the temperature sampling voltage converted by the thermistor TH is output to the positive terminal of the comparator chip IC1, and the comparator chip IC1 continuously compares the temperature sampling voltage with the temperature reference voltage, thereby controlling the on and off of the triode Q2. When the temperature of the mobile power supply rises to a set value, the temperature sampling voltage is lower than the temperature reference voltage, the comparator chip IC1 controls the transistor Q2 to be cut off, the MOS transistor Q1 is turned off under the influence of the working state of the transistor Q2, and the charging process of the mobile power supply is cut off. During normal charging, the transistor Q2 is turned on, and the MOS transistor Q1 is turned on. Therefore, the temperature is too high when the mobile power supply is charged, the risk of combustion caused by the too high temperature is reduced, and the potential safety hazard of the mobile power supply is reduced.
For the charging display module 3, a green light is used as the light emitting diode LED1 for indicating the charging state, a red light is used as the light emitting diode LED2 for indicating the completion of charging, the charging display module 3 outputs a preset rated voltage through the sampling resistor R8 and the sampling resistor R9, the voltage between the positive pole C + of the power output end and the negative pole C-of the power output end, namely the voltage of the sampling mobile power supply, is sampled through the sampling resistor R10 and the sampling resistor R11, the positive pole input to the comparator chip IC2 is compared with the rated voltage, if the sampling voltage is less than the rated voltage, the triode Q3 is cut off, and the light emitting diode LED1 for indicating the charging state is normally on, namely the green light is normally on; if the sampled voltage is consistent with the rated voltage, the transistor Q3 is turned on to indicate that the charged LED2 is lit, i.e., the red light is lit. This display module that charges 3 can present portable power source's charged state directly perceivedly, and the person of facilitating the use stops charging in time after the completion of charging, reduces the appearance of the overcharge condition.
While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (10)
1. The utility model provides a portable power source protection circuit that charges which characterized in that: include the reference voltage module and be used for preventing the too high temperature control module of portable power source charging temperature, the temperature control module includes comparator chip IC1, thermistor TH, MOS pipe Q1, triode Q2 and resistance R0, comparator chip IC 1's positive end and negative end are connected to reference voltage module output respectively, just thermistor TH connects between one end and reference voltage module wherein, MOS pipe Q1 connects between power input positive pole V + and power output positive pole C +, triode Q2's base and comparator chip IC1 output are connected, and projecting pole ground connection, collecting electrode are connected to MOS pipe Q1 grid, resistance R0 to be connected to power input positive pole V + through resistance R0's the other end, when the charging temperature is too high, MOS pipe Q1 and triode Q2 end, the disconnection of charging.
2. The charging protection circuit of claim 1, wherein: the collector of the triode Q2 is connected to a resistor R0 and the grid of a MOS tube Q1 through a resistor R1, a bias resistor R2 is connected in parallel between the base and the emitter, and a current-limiting resistor R3 is connected in series between the base and the output end of the comparator chip IC 1.
3. The charging protection circuit of claim 1, wherein: the positive power pin of the comparator chip IC1 is connected to the positive V + of the power input terminal through a current limiting resistor R4, and the negative power pin is grounded.
4. The charging protection circuit of claim 1, wherein: the positive terminal of the comparator chip IC1 is connected to the reference voltage module output terminal via the thermistor TH and the resistor R5, and the negative terminal is connected to the reference voltage module output terminal via the pull-up resistor R6 and is grounded via the pull-down resistor R7.
5. The charging protection circuit of claim 1, wherein: the charging display module comprises a comparator chip IC2, a triode Q3, a light emitting diode LED1 for indicating the charging state, a light emitting diode LED2 for indicating the charging completion, a sampling resistor R8, a sampling resistor R9, a sampling resistor R10 and a sampling resistor R11, wherein the negative end of the comparator chip IC2 is respectively connected with the sampling resistor R8 and the sampling resistor R9, the other end of the sampling resistor R8 is connected to the output end of the reference voltage module, the other end of the sampling resistor R9 is connected to the negative pole V-of the power input end, one end of the sampling resistor R10 is connected with the negative pole V-of the power input end, the other end of the sampling resistor R10 is connected with the negative pole C-of the power output end and the positive end of the comparator chip IC2, the sampling resistor R11 is connected with the two ends of the sampling resistor R10, the base of the triode Q3 is connected with the output end of the comparator chip IC2, the collector is connected with the positive electrode V + of the power input end, the emitter is grounded, a light-emitting diode LED1 is connected between the collector and the emitter of the triode Q3 in parallel, the positive electrode of the light-emitting diode LED2 is connected to the output end of the comparator chip IC2, and the negative electrode of the light-emitting diode LED2 is connected to the emitter of the triode Q3.
6. The charging protection circuit of claim 5, wherein: a current limiting resistor R12 is connected between the collector of the triode Q3 and the positive electrode V + of the power input end in series, and a current limiting resistor R13 is connected between the LED2 and the output end of the comparator chip IC2 in series.
7. The charging protection circuit of claim 5, wherein: a current limiting resistor R14 is connected in series between the base of the triode Q3 and the output end of the comparator chip IC2, and a bias resistor R15 is connected in parallel between the base and the emitter.
8. The charging protection circuit of claim 5, wherein: the circuit also comprises a capacitor C1, wherein the capacitor C1 is connected with the negative end and the output end of the comparator chip IC2 in parallel.
9. The charging protection circuit of claim 5, wherein: the reference voltage module comprises a voltage regulator tube U1 and a current-limiting resistor R16, wherein the output end of the voltage regulator tube U1 is connected with the positive electrode V + of the power input end through the current-limiting resistor R16, the input end is connected with the negative electrode V-of the power input end, the ground end, and the adjusting end is in short circuit with the output end.
10. The charging protection circuit of claim 5, wherein: the MOS transistor Q1 is a PMOS transistor, and the triode Q2 and the triode Q3 are NPN type triodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122169043.0U CN216390546U (en) | 2021-09-08 | 2021-09-08 | Charging protection circuit of mobile power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122169043.0U CN216390546U (en) | 2021-09-08 | 2021-09-08 | Charging protection circuit of mobile power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216390546U true CN216390546U (en) | 2022-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122169043.0U Active CN216390546U (en) | 2021-09-08 | 2021-09-08 | Charging protection circuit of mobile power supply |
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| Country | Link |
|---|---|
| CN (1) | CN216390546U (en) |
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2021
- 2021-09-08 CN CN202122169043.0U patent/CN216390546U/en active Active
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Address after: 361000 Xiamen Torch High tech Zone (Xiang'an) Industrial Zone, Xianghai Second Road, Xiamen City, Fujian Province, China, Accelerator Phase III, Building 3 Patentee after: XIAMEN XUNHENG ELECTRONICS TECH Co.,Ltd. Country or region after: China Address before: Room 3047, Xuanye building, Chuangye Park, torch high tech Zone, Xiamen City, Fujian Province Patentee before: XIAMEN XUNHENG ELECTRONICS TECH Co.,Ltd. Country or region before: China |