CN106712196B - Charging protection circuit and charger - Google Patents
Charging protection circuit and charger Download PDFInfo
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- CN106712196B CN106712196B CN201710046014.0A CN201710046014A CN106712196B CN 106712196 B CN106712196 B CN 106712196B CN 201710046014 A CN201710046014 A CN 201710046014A CN 106712196 B CN106712196 B CN 106712196B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention belongs to the technical field of charging, and particularly relates to a charging protection circuit and a charger. In the embodiment of the invention, the charging protection circuit is added on the original charger by adopting a circuit formed by two comparators, so that the intelligent charger capable of being powered off is changed into an intelligent charger capable of being powered off, and when the mobile phone is full or has no charging current, the power is off after a period of time, and the charger indicator lamp is turned off, so that the service life of the battery is shortened due to overcharge and repeated charging of the battery can be prevented, potential safety hazards caused by overcharging can be avoided, energy sources can be saved, and waste is reduced.
Description
Technical Field
The invention belongs to the technical field of charging, and particularly relates to a charging protection circuit and a charger.
Background
With the popularization of smart phones and the high-intensity use frequency, the electric quantity of the mobile phone is almost exhausted at night, the mobile phone is generally charged at night, the charging wire can be pulled out after the mobile phone wakes up the next day, however, the mobile phone is fully charged at midnight and is also connected with the charging wire, and the mobile phone equipment is unknowingly overcharged and repeatedly charged, so that the service life of the battery is shortened and the potential safety hazard exists.
Disclosure of Invention
The embodiment of the invention aims to provide a charging protection circuit and a charger, which aim to solve the problems of shortened service life and potential safety hazard of the existing rechargeable battery.
The embodiment of the invention is realized in such a way that a charge protection circuit comprises:
rectifier tube D1, diode D2, detection resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R13, comparator A, comparator B, capacitor C1, capacitor C2, capacitor C3, capacitor C4 and field effect transistor Q1;
the anode of the rectifying tube D1 is connected with a power supply, the cathode of the rectifying tube D1 is respectively connected with the first end of the capacitor C1, the first end of the capacitor C2 and the first end of the detection resistor R1, the second end of the capacitor C1 and the second end of the capacitor C2 are grounded, the second end of the detection resistor R1 is connected with a charging output positive electrode, the inverting input end of the comparator A is connected with the first end of the detection resistor R1 through the resistor R3, the non-inverting input end of the comparator A is connected with the second end of the detection resistor R1 through the resistor R4, the resistor R5 is connected between the non-inverting input end of the comparator A and the ground, the resistor R2 is connected between the inverting input end of the comparator A and the ground, the output end of the comparator A is connected with the first end of the detection resistor R1 through the resistor R11, the other path of the output end of the comparator A is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the inverting input end of the comparator B, the capacitor C3 is connected between the inverting input end of the comparator B and the ground, the resistor R7 and the resistor R6 are connected in series between the cathode of the rectifying tube D1 and the ground, the common connection end of the resistor R7 and the resistor R6 is connected with the non-inverting input end of the comparator B, the resistor R8 is connected in series between the cathode of the rectifying tube D1 and the inverting input end of the comparator B, the resistor R10 and the resistor R9 are connected in series between the cathode of the rectifying tube D1 and the grid of the field effect tube Q1, the common connection end of the resistor R10 and the resistor R9 is connected with the output end of the comparator B, the source of the field effect tube Q1 is connected with the charging output anode through the resistor R13, the drain of the field effect tube Q1 is grounded, the capacitor C4 is connected between the second end of the detection resistor R1 and ground.
In the above structure, the charge protection circuit further includes an indicator LED connected between the resistor R13 and the source of the field effect transistor Q1.
In the above structure, the charging protection circuit further includes a sampling circuit, where the sampling circuit includes a resistor R12 and an optocoupler U2, and the resistor R12 is connected between the second end of the detection resistor R1 and the optocoupler U2.
Another object of an embodiment of the present invention is to provide a charger including a charge protection circuit, the charge protection circuit including:
rectifier tube D1, diode D2, detection resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R13, comparator A, comparator B, capacitor C1, capacitor C2, capacitor C3, capacitor C4 and field effect transistor Q1;
the anode of the rectifying tube D1 is connected with a power supply, the cathode of the rectifying tube D1 is respectively connected with the first end of the capacitor C1, the first end of the capacitor C2 and the first end of the detection resistor R1, the second end of the capacitor C1 and the second end of the capacitor C2 are grounded, the second end of the detection resistor R1 is connected with a charging output positive electrode, the inverting input end of the comparator A is connected with the first end of the detection resistor R1 through the resistor R3, the non-inverting input end of the comparator A is connected with the second end of the detection resistor R1 through the resistor R4, the resistor R5 is connected between the non-inverting input end of the comparator A and the ground, the resistor R2 is connected between the inverting input end of the comparator A and the ground, the output end of the comparator A is connected with the first end of the detection resistor R1 through the resistor R11, the other path of the output end of the comparator A is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the inverting input end of the comparator B, the capacitor C3 is connected between the inverting input end of the comparator B and the ground, the resistor R7 and the resistor R6 are connected in series between the cathode of the rectifying tube D1 and the ground, the common connection end of the resistor R7 and the resistor R6 is connected with the non-inverting input end of the comparator B, the resistor R8 is connected in series between the cathode of the rectifying tube D1 and the inverting input end of the comparator B, the resistor R10 and the resistor R9 are connected in series between the cathode of the rectifying tube D1 and the grid of the field effect tube Q1, the common connection end of the resistor R10 and the resistor R9 is connected with the output end of the comparator B, the source of the field effect tube Q1 is connected with the charging output anode through the resistor R13, the drain of the field effect tube Q1 is grounded, the capacitor C4 is connected between the second end of the detection resistor R1 and ground.
In the above structure, the charge protection circuit further includes an indicator LED connected between the resistor R13 and the source of the field effect transistor Q1.
In the above structure, the charging protection circuit further includes a sampling circuit, where the sampling circuit includes a resistor R12 and an optocoupler U2, and the resistor R12 is connected between the second end of the detection resistor R1 and the optocoupler U2.
In the embodiment of the invention, the charging protection circuit is added on the original charger by adopting a circuit formed by two comparators, so that the intelligent charger capable of being powered off is changed into an intelligent charger capable of being powered off, and when the mobile phone is full or has no charging current, the power is off after a period of time, and the charger indicator lamp is turned off, so that the service life of the battery is shortened due to overcharge and repeated charging of the battery can be prevented, potential safety hazards caused by overcharging can be avoided, energy sources can be saved, and waste is reduced.
Drawings
Fig. 1 is a circuit configuration diagram of a charge protection circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Fig. 1 shows a circuit configuration of a charge protection circuit provided in an embodiment of the present invention, and for convenience of explanation, only a portion related to the embodiment of the present invention is shown.
A charge protection circuit, the charge protection circuit comprising:
rectifier tube D1, diode D2, detection resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R13, comparator A, comparator B, capacitor C1, capacitor C2, capacitor C3, capacitor C4 and field effect transistor Q1;
the anode of the rectifying tube D1 is connected with a power supply, the cathode of the rectifying tube D1 is respectively connected with the first end of the capacitor C1, the first end of the capacitor C2 and the first end of the detection resistor R1, the second end of the capacitor C1 and the second end of the capacitor C2 are grounded, the second end of the detection resistor R1 is connected with a charging output positive electrode, the inverting input end of the comparator A is connected with the first end of the detection resistor R1 through the resistor R3, the non-inverting input end of the comparator A is connected with the second end of the detection resistor R1 through the resistor R4, the resistor R5 is connected between the non-inverting input end of the comparator A and the ground, the resistor R2 is connected between the inverting input end of the comparator A and the ground, the output end of the comparator A is connected with the first end of the detection resistor R1 through the resistor R11, the other path of the output end of the comparator A is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the inverting input end of the comparator B, the capacitor C3 is connected between the inverting input end of the comparator B and the ground, the resistor R7 and the resistor R6 are connected in series between the cathode of the rectifying tube D1 and the ground, the common connection end of the resistor R7 and the resistor R6 is connected with the non-inverting input end of the comparator B, the resistor R8 is connected in series between the cathode of the rectifying tube D1 and the inverting input end of the comparator B, the resistor R10 and the resistor R9 are connected in series between the cathode of the rectifying tube D1 and the grid of the field effect tube Q1, the common connection end of the resistor R10 and the resistor R9 is connected with the output end of the comparator B, the source of the field effect tube Q1 is connected with the charging output anode through the resistor R13, the drain of the field effect tube Q1 is grounded, the capacitor C4 is connected between the second end of the detection resistor R1 and ground.
As an embodiment of the present invention, the charge protection circuit further includes an indicator LED, and the indicator LED is connected between the resistor R13 and the source of the field effect transistor Q1.
As an embodiment of the present invention, the charge protection circuit further includes a sampling circuit, where the sampling circuit includes a resistor R12 and an optocoupler U2, and the resistor R12 is connected between the second end of the detection resistor R1 and the optocoupler U2.
The embodiment of the invention also provides a charger, which comprises a charging protection circuit, wherein the charging protection circuit comprises:
rectifier tube D1, diode D2, detection resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R13, comparator A, comparator B, capacitor C1, capacitor C2, capacitor C3, capacitor C4 and field effect transistor Q1;
the anode of the rectifying tube D1 is connected with a power supply, the cathode of the rectifying tube D1 is respectively connected with the first end of the capacitor C1, the first end of the capacitor C2 and the first end of the detection resistor R1, the second end of the capacitor C1 and the second end of the capacitor C2 are grounded, the second end of the detection resistor R1 is connected with a charging output positive electrode, the inverting input end of the comparator A is connected with the first end of the detection resistor R1 through the resistor R3, the non-inverting input end of the comparator A is connected with the second end of the detection resistor R1 through the resistor R4, the resistor R5 is connected between the non-inverting input end of the comparator A and the ground, the resistor R2 is connected between the inverting input end of the comparator A and the ground, the output end of the comparator A is connected with the first end of the detection resistor R1 through the resistor R11, the other path of the output end of the comparator A is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the inverting input end of the comparator B, the capacitor C3 is connected between the inverting input end of the comparator B and the ground, the resistor R7 and the resistor R6 are connected in series between the cathode of the rectifying tube D1 and the ground, the common connection end of the resistor R7 and the resistor R6 is connected with the non-inverting input end of the comparator B, the resistor R8 is connected in series between the cathode of the rectifying tube D1 and the inverting input end of the comparator B, the resistor R10 and the resistor R9 are connected in series between the cathode of the rectifying tube D1 and the grid of the field effect tube Q1, the common connection end of the resistor R10 and the resistor R9 is connected with the output end of the comparator B, the source of the field effect tube Q1 is connected with the charging output anode through the resistor R13, the drain of the field effect tube Q1 is grounded, the capacitor C4 is connected between the second end of the detection resistor R1 and ground.
As an embodiment of the present invention, the charge protection circuit further includes an indicator LED, and the indicator LED is connected between the resistor R13 and the source of the field effect transistor Q1.
As an embodiment of the present invention, the charge protection circuit further includes a sampling circuit, where the sampling circuit includes a resistor R12 and an optocoupler U2, and the resistor R12 is connected between the second end of the detection resistor R1 and the optocoupler U2.
In the figure, D1 is a secondary rectifier tube of the charger, R1 is a detection charging current, R12 is a sampling circuit, and the sampling circuit is connected with the rear of R1 to sample the original charger, so that the output voltage is prevented from being reduced, an optocoupler U2 is used for simplifying the figure, an actual circuit is generally a TL431, sampling is performed by means of partial pressure of two precise resistors, and only a sampling resistor connected with the positive electrode is connected with the rear of R1. When charging current passes through, R1 generates voltage drop, and the voltage is higher than the voltage of the same phase end of the comparator A, so that the voltage of the opposite phase end of the comparator B is pulled down by D2, and the comparator B outputs high level to control the field effect to be continuously conducted; when the charging current drops below 20ma (the charging cut-off current of a general mobile phone is zero or several milliamperes), the voltage of the inverting terminal of the comparator A drops below the non-inverting terminal, D2 is cut off, the resistor R8 charges C3, and when the voltage of the inverting terminal of the comparator B is higher than the non-inverting terminal, the field effect tube is cut off, and the charger stops outputting.
In the figure, R8 and C3 determine the delay time, if the mobile phone is not connected with the charger, the mobile phone is powered off after 15 seconds, so the mobile phone is generally connected first.
In the embodiment of the invention, the charging protection circuit is added on the original charger by adopting a circuit formed by two comparators, so that the intelligent charger capable of being powered off is changed into an intelligent charger capable of being powered off, and when the mobile phone is full or has no charging current, the power is off after a period of time, and the charger indicator lamp is turned off, so that the service life of the battery is shortened due to overcharge and repeated charging of the battery can be prevented, potential safety hazards caused by overcharging can be avoided, energy sources can be saved, and waste is reduced.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (6)
1. A charge protection circuit, the charge protection circuit comprising:
rectifier tube D1, diode D2, detection resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R13, comparator A, comparator B, capacitor C1, capacitor C2, capacitor C3, capacitor C4 and field effect transistor Q1;
the anode of the rectifying tube D1 is connected with a power supply, the cathode of the rectifying tube D1 is respectively connected with the first end of the capacitor C1, the first end of the capacitor C2 and the first end of the detection resistor R1, the second end of the capacitor C1 and the second end of the capacitor C2 are grounded, the second end of the detection resistor R1 is connected with a charging output positive electrode, the inverting input end of the comparator A is connected with the first end of the detection resistor R1 through the resistor R3, the non-inverting input end of the comparator A is connected with the second end of the detection resistor R1 through the resistor R4, the resistor R5 is connected between the non-inverting input end of the comparator A and the ground, the resistor R2 is connected between the inverting input end of the comparator A and the ground, the output end of the comparator A is connected with the first end of the detection resistor R1 through the resistor R11, the other path is connected with the cathode of the diode D2, the inverting input end of the diode D2 is connected with the resistor B7 and the cathode of the resistor R1 through the resistor R9, the inverting input end of the resistor B7 is connected with the common resistor R1 and the input end of the resistor R1 is connected with the resistor R9, the common resistor R1 is connected with the input end of the resistor R1 is connected with the resistor R9, the common resistor is connected with the output end of the resistor R1 is connected with the output end of the resistor R9 is connected with the resistor R1 is connected with the common resistor B is connected with the resistor B. The capacitor C4 is connected between the second end of the detection resistor R1 and ground.
2. The charge protection circuit of claim 1, further comprising an indicator LED connected between the resistor R13 and the source of the field effect transistor Q1.
3. The charge protection circuit of claim 2, further comprising a sampling circuit, the sampling circuit comprising a resistor R12 and an optocoupler U2, the resistor R12 being connected between the second end of the detection resistor R1 and the optocoupler U2.
4. A charger comprising a charge protection circuit, the charge protection circuit comprising:
rectifier tube D1, diode D2, detection resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R13, comparator A, comparator B, capacitor C1, capacitor C2, capacitor C3, capacitor C4 and field effect transistor Q1;
the anode of the rectifying tube D1 is connected with a power supply, the cathode of the rectifying tube D1 is respectively connected with the first end of the capacitor C1, the first end of the capacitor C2 and the first end of the detection resistor R1, the second end of the capacitor C1 and the second end of the capacitor C2 are grounded, the second end of the detection resistor R1 is connected with a charging output positive electrode, the inverting input end of the comparator A is connected with the first end of the detection resistor R1 through the resistor R3, the non-inverting input end of the comparator A is connected with the second end of the detection resistor R1 through the resistor R4, the resistor R5 is connected between the non-inverting input end of the comparator A and the ground, the resistor R2 is connected between the inverting input end of the comparator A and the ground, the output end of the comparator A is connected with the first end of the detection resistor R1 through the resistor R11, the other path of the output end of the comparator A is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the inverting input end of the comparator B, the capacitor C3 is connected between the inverting input end of the comparator B and the ground, the resistor R7 and the resistor R6 are connected in series between the cathode of the rectifying tube D1 and the ground, the common connection end of the resistor R7 and the resistor R6 is connected with the non-inverting input end of the comparator B, the resistor R8 is connected in series between the cathode of the rectifying tube D1 and the inverting input end of the comparator B, the resistor R10 and the resistor R9 are connected in series between the cathode of the rectifying tube D1 and the grid of the field effect tube Q1, the common connection end of the resistor R10 and the resistor R9 is connected with the output end of the comparator B, the source of the field effect tube Q1 is connected with the charging output anode through the resistor R13, the drain of the field effect tube Q1 is grounded, the capacitor C4 is connected between the second end of the detection resistor R1 and ground.
5. The charger of claim 4 wherein the charge protection circuit further comprises an indicator LED connected between the resistor R13 and the source of the fet Q1.
6. The charger of claim 5 wherein the charge protection circuit further comprises a sampling circuit comprising a resistor R12 and an optocoupler U2, the resistor R12 being connected between the second terminal of the detection resistor R1 and the optocoupler U2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710046014.0A CN106712196B (en) | 2017-01-21 | 2017-01-21 | Charging protection circuit and charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710046014.0A CN106712196B (en) | 2017-01-21 | 2017-01-21 | Charging protection circuit and charger |
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| CN106712196A CN106712196A (en) | 2017-05-24 |
| CN106712196B true CN106712196B (en) | 2023-05-16 |
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| CN201710046014.0A Active CN106712196B (en) | 2017-01-21 | 2017-01-21 | Charging protection circuit and charger |
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| CN106712196A (en) | 2017-05-24 |
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