CN114069805B - Overcharge protection circuit, power supply circuit and electronic equipment - Google Patents
Overcharge protection circuit, power supply circuit and electronic equipment Download PDFInfo
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- CN114069805B CN114069805B CN202210047503.9A CN202210047503A CN114069805B CN 114069805 B CN114069805 B CN 114069805B CN 202210047503 A CN202210047503 A CN 202210047503A CN 114069805 B CN114069805 B CN 114069805B
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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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
- H02J7/00308—Overvoltage protection
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
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Abstract
The invention belongs to the technical field of battery charging, and particularly relates to an overcharge protection circuit, a power supply circuit and electronic equipment, wherein the overcharge protection circuit comprises a switch circuit, a sampling circuit, an overvoltage control circuit and a bleeder circuit, multiple overcharge protection of a battery is realized, when the overcharge is caused by normal charging of the charging circuit, the overvoltage control circuit controls the switch circuit to be turned off and stops charging, when the charging circuit carries out leakage charging on the battery due to an external potential leakage path, the bleeder circuit switches to work, the magnitude of bleeder current is controlled according to the current voltage of the battery after the leakage rises, dynamic bleeder is carried out, so that the voltage of the battery is maintained below a second preset voltage, the damage of the battery due to the leakage overcharge is avoided, and the reliability of the overcharge protection is improved.
Description
Technical Field
The invention belongs to the technical field of battery charging, and particularly relates to an overcharge protection circuit, a power supply circuit and electronic equipment.
Background
With the miniaturization of many consumer devices and the vigorous development of internet of things devices, a great deal of demand is generated for batteries which are internally arranged for energy storage, and the batteries are widely applied.
In the use of equipment, the battery frequently carries out the discharge and the charging process, and for the battery, if take place overcharge and can make inside electrolyte generate heat and decompose and produce gas, internal confined space forms pressure, leads to the battery inflation, breaks, even short circuit fires to cause hidden danger and accident. Therefore, higher demands are made on preventing and avoiding the safety risk of the battery due to overcharge.
The conventional overcharge protection method is to trigger a preliminary overcharge protection when the lithium battery is in an overcharge condition, and to close a preset charge path.
However, if the overcharge protection circuit itself has some leakage path outside the protection circuit for some reason (e.g., circuit board is wet, contaminated, etc.), there is a risk that the leakage charging will cause the overcharge of the battery, and in this case, the conventional overcharge protection method cannot provide a reliable protection function, and the reliability of the overcharge protection is low.
Disclosure of Invention
The invention aims to provide an overcharge protection circuit, and aims to solve the problem that a traditional overcharge protection scheme cannot provide reliable protection for leakage charging.
A first aspect of an embodiment of the present invention provides an overcharge protection circuit, including:
a switching circuit connected between the charging circuit and the battery;
the sampling circuit is connected with the battery and is used for acquiring the voltage of the battery;
the overvoltage control circuit is respectively connected with the switch circuit and the sampling circuit and is used for triggering and controlling the switch circuit to be switched off when the voltage of the battery is greater than a first preset voltage;
the bleeder circuit is used for triggering dynamic bleeder compensation work when the voltage of the battery is greater than a second preset voltage so as to carry out current bleeder on the battery;
the first preset voltage is smaller than the second preset voltage, and the bleeder current of the bleeder circuit is equal to the leakage current between the charging circuit and the battery.
Optionally, the bleeding circuit comprises:
the error detection amplifying circuit is connected with the sampling circuit and used for amplifying and converting the difference value between the voltage of the battery and the second preset voltage and outputting a voltage amplification signal;
the first end of the voltage-controlled switch circuit is connected with the anode of the battery, the second end of the voltage-controlled switch circuit is grounded, the controlled end of the voltage-controlled switch circuit is connected with the signal output end of the error detection amplifying circuit, and the voltage-controlled switch circuit is triggered by the voltage amplifying signal to be conducted and releases the battery;
wherein a bleed current of the voltage controlled switching circuit is equal to a leakage current between the charging circuit and the battery.
Optionally, the voltage-controlled switching circuit includes a first resistor, a first capacitor, a second capacitor, and a field-effect switching transistor;
the input of field effect switch tube with the anodal of battery is connected, field effect switch tube's output ground connection, field effect switch tube's controlled end, the first end of first resistance with the first end of second electric capacity connects altogether and with error detection amplifier circuit's signal output part is connected, the second end of first resistance with the first end of first electric capacity is connected, the second end of first electric capacity with the second end of second electric capacity all grounds.
Optionally, the error detection amplifying circuit comprises an error amplifier;
the positive phase input end of the error amplifier is connected with the second signal end of the sampling circuit, the negative phase input end of the error amplifier is used for inputting the second preset voltage, and the output end of the error amplifier is connected with the controlled end of the voltage-controlled switch circuit.
Optionally, the overvoltage control circuit comprises a comparator;
the positive phase input end of the comparator is connected with the first signal end of the sampling circuit, the negative phase input end of the comparator is used for inputting the first preset voltage, and the output end of the comparator is connected with the controlled end of the switch circuit.
Optionally, the overcharge protection circuit further comprises:
and the reference circuit is used for outputting the first preset voltage value, the overvoltage control circuit and the bleeder circuit for outputting the second preset voltage value.
Optionally, the overcharge protection circuit further comprises:
the filter circuit is connected to two ends of the battery and performs filtering work, and comprises a second resistor and a third capacitor;
the first end of the second resistor is connected with the positive electrode of the battery, the second end of the second resistor, the first end of the third capacitor, the signal input end of the sampling circuit and the input end of the bleeder circuit are connected, and the second end of the third capacitor is connected with the negative electrode of the battery and grounded.
Optionally, the switch circuit includes a power switch, a first end of the power switch is connected to a negative end of the charging circuit, a second end of the power switch is connected to a negative electrode of the battery, and a positive end of the charging circuit is connected to a positive electrode of the battery.
A second aspect of an embodiment of the present invention provides a power supply circuit, which includes a charging circuit, a battery, and the overcharge protection circuit described above, where the charging circuit is connected to the battery through the overcharge protection circuit.
A third aspect of embodiments of the present invention provides an electronic device, including the overcharge protection circuit described above, or including the power supply circuit described above.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the over-charge protection circuit realizes multi-over-charge protection of the battery by setting the switch circuit, the sampling circuit, the overvoltage control circuit and the discharge circuit, when the charging circuit is normally charged to cause over-charge, the overvoltage control circuit controls the switch circuit to be turned off, and charging is stopped.
Drawings
Fig. 1 is a schematic diagram of a first structure of an overcharge protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a second structure of an overcharge protection circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a third structure of an overcharge protection circuit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of an overcharge protection circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a power supply circuit according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
A first aspect of an embodiment of the present invention provides an overcharge protection circuit 100.
As shown in fig. 1, in the present embodiment, the overcharge protection circuit 100 includes:
a switching circuit 10 connected between the charging circuit 200 and the battery 300;
the sampling circuit 20 is connected with the battery 300, and the sampling circuit 20 is used for collecting the voltage of the battery 300;
the overvoltage control circuit 30 is respectively connected with the switch circuit 10 and the sampling circuit 20, and the overvoltage control circuit 30 is used for triggering and controlling the switch circuit 10 to be turned off when the voltage of the battery 300 is greater than a first preset voltage;
the bleeder circuit 40 is connected to the battery 300 and the sampling circuit 20, and the bleeder circuit 40 is configured to trigger the dynamic bleeder compensation operation when the voltage of the battery 300 is greater than a second preset voltage, so as to perform current bleeder on the battery 300;
the first preset voltage is less than the second preset voltage, and the bleeding current of the bleeding circuit 40 is equal to the leakage current between the charging circuit 200 and the battery 300.
In this embodiment, in the normal charging state, the switch circuit 10 is in the on state, the on state of the switch circuit 10 may be controlled by the overvoltage control circuit 30, or the on state may be controlled by the charging control circuit, and the control manner of the specific on state of the switch circuit 10 is not limited.
For example, when controlled by the overvoltage control circuit 30, before the initial charging, the overvoltage control circuit 30 detects that the voltage of the battery 300 is less than or equal to the first preset voltage through the sampling circuit 20, outputs a first switching signal to the switching circuit 10, and controls the switching circuit 10 to be turned on.
Or when the conduction state is controlled by the charging control circuit, the controlled end of the switch circuit 10 is respectively connected with the charging control circuit and the overvoltage control circuit 30, and when the charging is started, the charging control circuit outputs a charging control signal to the switch circuit 10 according to the received charging instruction or key operation, so as to control the switch circuit 10 to be conducted.
The overvoltage control circuit 30 is a first-stage overcharge protection, so that the overcharge protection between the charging circuit 200 and the battery 300 in a normal charging state is realized, when the voltage of the battery 300 is greater than a first preset voltage, the overvoltage control circuit 30 determines that the overcharge currently occurs, outputs a turn-off control signal to the switch circuit 10, and stops the charging circuit 200 to continuously charge the battery 300, so that the first-stage overcharge protection is provided.
Meanwhile, an external potential leakage path 400 may exist between the charging circuit 200 and the battery 300, which causes the charging circuit 200 to perform leakage charging on the battery 300 through the external potential leakage path 400, at this time, the bleeding circuit 40 is a second-stage overcharge protection, the voltage of the battery 300 is obtained through the sampling circuit 20, and when the voltage of the battery 300 is greater than a second preset voltage, the bleeding circuit 40 triggers a bleeding operation to bleed off the leakage charging current of the battery 300, so as to cancel the bleeding current and the leakage current, and at the same time, the magnitude of the bleeding current is correspondingly controlled according to the voltage of the battery 300, so that the bleeding current is equal to the leakage charging current by controlling the magnitude of the bleeding current, thereby maintaining the voltage of the battery 300 at and below the second preset voltage, and implementing the second-stage overcharge protection.
Specifically, when the leakage current is large, the voltage of the battery 300 becomes large, at this time, the leakage current of the leakage circuit 40 increases, when the leakage current is small, the voltage of the battery 300 becomes small, at this time, the leakage current of the leakage circuit 40 becomes small, when the leakage current is zero, the voltage of the battery 300 does not change, at this time, the leakage circuit 40 is turned off, the leakage current of the leakage circuit 40 is zero, and the over-discharge of the battery 300 is prevented.
Through the arrangement of the overvoltage control circuit 30 and the bleeder circuit 40, two-stage overcharge protection of the battery 300 is realized, the charging circuit 200 is prevented from overcharging the battery 300 through the switch circuit 10 or the external potential leakage path 400, the further increase of the voltage of the battery 300 is prevented, the function of reliably preventing and avoiding overvoltage charging of the battery 300 is realized, and higher-level safety guarantee is achieved.
In order to avoid the false triggering of the bleeding circuit 40, the second preset voltage is greater than the first preset voltage, so that when the overcharge occurs in the normal charging state, the overvoltage control circuit 30 triggers the overcharge protection function first, and the bleeding circuit 40 triggers the overcharge protection function when the leakage charging occurs.
The first preset voltage and the second preset voltage may be set for the internal circuits of the overvoltage control circuit 30 and the bleeder circuit 40, or provided by other modules.
Optionally, as shown in fig. 3, the first preset voltage and the second preset voltage are provided by the reference circuit 50, and the overcharge protection circuit 100 further includes:
and the reference circuit 50 is respectively connected with the overvoltage control circuit 30 and the bleeder circuit 40, and the reference circuit 50 is used for outputting a first preset voltage value, the overvoltage control circuit 30 and a second preset voltage value bleeder circuit 40.
The reference circuit 50 may adopt a reference voltage source with a corresponding structure, and may further include a corresponding voltage stabilizing circuit, so as to output a first preset voltage and a second preset voltage with different voltage levels.
In the present embodiment, the switch circuit 10 may adopt a switch structure with controlled on-off, such as a relay, a switch tube, and the like, and optionally, as shown in fig. 4, in order that the switch circuit 10 includes a power switch M2, a first terminal of the power switch M2 is connected to the negative terminal of the charging circuit 200, a second terminal of the power switch M2 is connected to the negative terminal of the battery 300, and the positive terminal of the charging circuit 200 is connected to the positive terminal of the battery 300.
The power switch M2 remains on during normal charging, and the overvoltage control circuit 30 controls the power switch M2 to turn off when overcharging occurs during initial charging.
The sampling circuit 20 samples the voltage of the battery 300 and outputs voltage sampling signals with corresponding magnitudes to the overvoltage control circuit 30 and the bleeder circuit 40, and the sampling circuit 20 may employ a corresponding proportional sampling circuit 20, such as a resistor divider circuit, a transformer, etc., and further outputs voltage sampling signals with different magnitudes by changing the magnitude of the divider resistor or the coil turn ratio of the transformer.
The overvoltage control circuit 30 may be a controller, a comparator U2, and the like, and correspondingly triggers the switch circuit 10 to turn off according to the voltage of the battery 300, and optionally, as shown in fig. 4, the overvoltage control circuit 30 includes a comparator U2;
the non-inverting input terminal of the comparator U2 is connected to the first signal terminal of the sampling circuit 20, the inverting input terminal of the comparator U2 is used for inputting the first preset voltage, and the output terminal of the comparator U2 is connected to the controlled terminal of the switching circuit 10.
In this embodiment, the power switch M2 is turned on and off by the overvoltage control circuit 30, when the voltage of the battery 300 is lower than the first preset voltage, the comparator U2 outputs a low level and controls the switch circuit 10 to be turned on, and when the voltage of the battery 300 is higher than the first preset voltage, the comparator U2 outputs a high level and controls the switch circuit 10 to be turned off, thereby implementing the first-stage overvoltage protection.
According to the on-off mode of the power switch M2, a corresponding logic circuit, such as an inverter, a power amplifier, etc., may be further disposed between the comparator U2 and the power switch M2, so as to output a level signal with a corresponding magnitude and type to the power switch M2, and further control the on-off of the power switch M2.
The bleeder circuit 40 may adopt a corresponding structure such as a comparator circuit and a current output circuit, and the specific structure is not limited.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the overcharge protection circuit 100 realizes multiple overcharge protection of the battery 300 by arranging the switch circuit 10, the sampling circuit 20, the overvoltage control circuit 30 and the bleeder circuit 40, when the overcharge is caused by normal charging of the charging circuit 200, the overvoltage control circuit 30 controls the switch circuit 10 to be turned off, the charging is stopped, when the charging circuit 200 performs leakage charging on the battery 300 through the external potential leakage path 400, the bleeder circuit 40 switches to work, the magnitude of the bleeder current is controlled according to the voltage of the current battery 300 after the leakage rises, the bleeder current is dynamically released, the bleeder current is equal to the leakage current, the voltage of the battery 300 is controlled to be maintained at a second preset voltage or below, the damage of the battery 300 caused by the leakage overcharge is avoided, and the overcharge protection reliability is improved.
As shown in fig. 2, optionally, the bleeding circuit 40 includes:
an error detection amplifying circuit 41 connected to the sampling circuit 20, for performing amplification conversion on the difference between the voltage of the battery 300 and a second preset voltage, and outputting a voltage amplification signal;
the first end of the voltage-controlled switch circuit 42 is connected with the positive electrode of the battery 300, the second end of the voltage-controlled switch circuit 42 is grounded, the controlled end of the voltage-controlled switch circuit 42 is connected with the signal output end of the error detection amplifying circuit 41, and the voltage-controlled switch circuit 42 is triggered by a voltage amplification signal to be conducted and discharges the battery 300;
wherein the bleeding current of the voltage-controlled switching circuit 42 is equal to the leakage current between the charging circuit 200 and the battery 300.
In this embodiment, the error detection amplifying circuit 41 implements comparison and amplification between the voltage of the battery 300 and the second preset voltage, and outputs a voltage amplifying signal to the voltage-controlled switch circuit 42, and the output current of the voltage-controlled switch circuit 42, i.e. the leakage current, changes with the controlled voltage.
During specific operation, when the leakage current is large, the voltage of the battery 300 is large, the voltage amplification signal output by the error detection amplification circuit 41 becomes large, and the opening degree of the internal discharge channel of the voltage-controlled switch circuit 42 becomes large, so that the current with the corresponding magnitude is output, and the discharge of the leakage current of the battery 300 is realized.
When the leakage current is small, the voltage of the battery 300 is small, the voltage amplification signal output by the error detection amplification circuit 41 is small, and the opening degree of the internal discharge channel of the voltage-controlled switch circuit 42 is small, so that the current with the corresponding magnitude is output, and the leakage current of the battery 300 is discharged.
When the leakage current is zero, the voltage of the battery 300 is less than or equal to the second preset voltage and remains unchanged, at this time, the voltage amplification signal output by the error detection amplification circuit 41 is zero or negative voltage, the voltage-controlled switching circuit 42 is turned off, and the discharge is cut off.
The error detection amplifying circuit 41 may adopt an error amplifier U1, a comparator U2, and the like, and the voltage control switch circuit 42 may adopt a corresponding switch structure.
Alternatively, as shown in fig. 4, the voltage-controlled switching circuit 42 includes a first resistor R1, a first capacitor C1, a second capacitor C2, and a field-effect switch M1;
the input end of the field-effect switch tube M1 is connected with the positive electrode of the battery 300, the output end of the field-effect switch tube M1 is grounded, the controlled end of the field-effect switch tube M1, the first end of the first resistor R1 and the first end of the second capacitor C2 are connected in common and connected with the signal output end of the error detection amplifying circuit 41, the second end of the first resistor R1 is connected with the first end of the first capacitor C1, and the second end of the first capacitor C1 and the second end of the second capacitor C2 are both grounded.
The error detection amplification circuit 41 includes an error amplifier U1;
the non-inverting input terminal of the error amplifier U1 is connected to the second signal terminal of the sampling circuit 20, the inverting input terminal of the error amplifier U1 is used for inputting the second preset voltage, and the output terminal of the error amplifier U1 is connected to the controlled terminal of the voltage-controlled switching circuit 42.
During operation, when the leakage current is large, the voltage of the battery 300 is large, the voltage amplification signal output by the error amplifier U1 becomes large, the controlled terminal voltage of the field-effect switch tube M1 becomes large, the output current of the field-effect switch tube M1 becomes large, and the leakage current of the battery 300 is discharged.
When the leakage current is small, the voltage of the battery 300 is small, the voltage amplification signal output by the error amplifier U1 becomes small, the controlled terminal voltage of the field-effect switch tube M1 becomes small, the output current of the field-effect switch tube M1 becomes small, and the leakage current of the battery 300 is discharged.
When the leakage current is zero, the voltage of the battery 300 is less than or equal to the second preset voltage, at this time, the voltage amplification signal output by the error amplifier U1 is zero or negative voltage, the field-effect switch tube M1 is turned off, and the discharge is cut off.
With continued reference to fig. 3 and 4, optionally, the overcharge protection circuit 100 further includes:
a filter circuit 60 connected to both ends of the battery 300 and performing a filtering operation, the filter circuit 60 including a second resistor R2 and a third capacitor C3;
a first end of the second resistor R2 is connected to the positive electrode of the battery 300, a second end of the second resistor R2, a first end of the third capacitor C3, a signal input end of the sampling circuit 20 and an input end of the bleeder circuit 40 are connected, and a second end of the third capacitor C3 is connected to the negative electrode of the battery 300 and grounded.
In this embodiment, the third capacitor C3 completes the filtering operation for the input and the output of the battery 300, on one hand, the filtering operation for charging the battery 300 by the charging circuit 200 is realized, and on the other hand, the filtering operation includes the filtering operation of the sampling circuit 20.
The external potential leakage path 400 may be equivalent to a third resistor R3, the charging circuit 200 performs leakage charging through the equivalent third resistor R3, and the leakage circuit 40 performs a leakage current releasing operation, and performs a cancellation operation of the leakage current and the leakage current, thereby ensuring that the voltage of the battery 300 is maintained at or below the second preset voltage.
As shown in fig. 5, the present invention further provides a power circuit, which includes a charging circuit 200, a battery 300 and an overcharge protection circuit 100, and the specific structure of the overcharge protection circuit 100 refers to the above embodiments, and since the power circuit adopts all technical solutions of all the above embodiments, the power circuit at least has all beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated herein. Wherein, the charging circuit 200 is connected with the battery 300 through the overcharge protection circuit 100.
In this embodiment, the overcharge protection circuit 100 implements two-stage protection of charging the battery 300, including overcharge protection in a normal charging state and dynamic overcharge protection in a leakage state, thereby improving the reliability of overcharge protection.
The charging circuit 200 can adopt a corresponding power switch circuit 10, such as a voltage boosting circuit, a voltage reducing circuit, and a voltage boosting and reducing circuit, and the charging circuit 200, the charging protection circuit, and the battery 300 case are correspondingly disposed on one or more circuit boards, and the specific arrangement position is not limited.
The present invention further provides an electronic device, which includes the overcharge protection circuit 100 or includes the power supply circuit, and the specific structure of the overcharge protection circuit 100 or the power supply circuit refers to the foregoing embodiments.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (9)
1. An overcharge protection circuit, comprising:
a switching circuit connected between the charging circuit and the battery;
the sampling circuit is connected with the battery and is used for acquiring the voltage of the battery;
the overvoltage control circuit is respectively connected with the switch circuit and the sampling circuit and is used for triggering and controlling the switch circuit to be switched off when the voltage of the battery is greater than a first preset voltage;
the bleeder circuit is used for triggering dynamic bleeder compensation work when the voltage of the battery is greater than a second preset voltage so as to carry out current bleeder on the battery;
wherein the first preset voltage is less than the second preset voltage;
the bleeding circuit includes:
the error detection amplifying circuit is connected with the sampling circuit and used for amplifying and converting the difference value between the voltage of the battery and the second preset voltage and outputting a voltage amplification signal;
the first end of the voltage-controlled switch circuit is connected with the anode of the battery, the second end of the voltage-controlled switch circuit is grounded, the controlled end of the voltage-controlled switch circuit is connected with the signal output end of the error detection amplifying circuit, and the voltage-controlled switch circuit is triggered by the voltage amplifying signal to be conducted and releases the battery;
wherein a bleed current of the voltage controlled switching circuit is equal to a leakage current between the charging circuit and the battery.
2. The overcharge protection circuit of claim 1, wherein the voltage-controlled switching circuit comprises a first resistor, a first capacitor, a second capacitor, and a field-effect switching transistor;
the input of field effect switch tube with the anodal of battery is connected, field effect switch tube's output ground connection, field effect switch tube's controlled end, the first end of first resistance with the first end of second electric capacity connects altogether and with error detection amplifier circuit's signal output part is connected, the second end of first resistance with the first end of first electric capacity is connected, the second end of first electric capacity with the second end of second electric capacity all grounds.
3. The overcharge protection circuit of claim 1, wherein the error detection amplification circuit comprises an error amplifier;
the positive phase input end of the error amplifier is connected with the second signal end of the sampling circuit, the negative phase input end of the error amplifier is used for inputting the second preset voltage, and the output end of the error amplifier is connected with the controlled end of the voltage-controlled switch circuit.
4. The overcharge protection circuit of claim 1, wherein the overvoltage control circuit comprises a comparator;
the positive phase input end of the comparator is connected with the first signal end of the sampling circuit, the negative phase input end of the comparator is used for inputting the first preset voltage, and the output end of the comparator is connected with the controlled end of the switch circuit.
5. The overcharge protection circuit of claim 1, further comprising:
and the reference circuit is used for outputting the first preset voltage value to the overvoltage control circuit and outputting the second preset voltage value to the bleeder circuit.
6. The overcharge protection circuit of claim 1, further comprising:
the filter circuit is connected to two ends of the battery and performs filtering work, and comprises a second resistor and a third capacitor;
the first end of the second resistor is connected with the positive electrode of the battery, the second end of the second resistor, the first end of the third capacitor, the signal input end of the sampling circuit and the input end of the bleeder circuit are connected, and the second end of the third capacitor is connected with the negative electrode of the battery and grounded.
7. The overcharge protection circuit of claim 1, wherein the switching circuit comprises a power switch, a first terminal of the power switch being connected to a negative terminal of the charging circuit, a second terminal of the power switch being connected to a negative terminal of the battery, and a positive terminal of the charging circuit being connected to a positive terminal of the battery.
8. A power supply circuit comprising a charging circuit, a battery and an overcharge protection circuit as claimed in any one of claims 1 to 7, the charging circuit being connected to the battery via the overcharge protection circuit.
9. An electronic device comprising the overcharge protection circuit of any one of claims 1 to 7, or the power supply circuit of claim 8.
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| CN202210047503.9A CN114069805B (en) | 2022-01-17 | 2022-01-17 | Overcharge protection circuit, power supply circuit and electronic equipment |
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| CN202210047503.9A CN114069805B (en) | 2022-01-17 | 2022-01-17 | Overcharge protection circuit, power supply circuit and electronic equipment |
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| CN111934401A (en) * | 2020-09-24 | 2020-11-13 | 苏州赛芯电子科技有限公司 | Battery protection circuit and lithium battery system |
| CN113472061A (en) * | 2021-06-29 | 2021-10-01 | 漳州科华技术有限责任公司 | Power takeoff power supply overvoltage protection circuit |
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| JP4965855B2 (en) * | 2005-12-19 | 2012-07-04 | セイコーインスツル株式会社 | Battery state monitoring circuit and battery device |
| CN101626152A (en) * | 2008-07-10 | 2010-01-13 | 利奥电池系统（上海）有限公司 | Battery protective circuit and battery protective method |
| CN108879824B (en) * | 2018-06-19 | 2020-11-27 | 中微半导体(深圳)股份有限公司 | Integrated rechargeable battery protection function circuit |
| CN109638918B (en) * | 2018-12-25 | 2020-10-30 | 昆山龙腾光电股份有限公司 | Charging circuit and electronic equipment |
| CN111934402B (en) * | 2020-09-25 | 2021-01-01 | 苏州赛芯电子科技有限公司 | Battery protection system and battery system |
| CN112531825A (en) * | 2020-11-25 | 2021-03-19 | 深圳市创芯微微电子有限公司 | Battery protection circuit and battery charge-discharge circuit |
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2022
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111934401A (en) * | 2020-09-24 | 2020-11-13 | 苏州赛芯电子科技有限公司 | Battery protection circuit and lithium battery system |
| CN113472061A (en) * | 2021-06-29 | 2021-10-01 | 漳州科华技术有限责任公司 | Power takeoff power supply overvoltage protection circuit |
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