CN114448003A - Charging protection circuit and charging device - Google Patents
Charging protection circuit and charging device Download PDFInfo
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- CN114448003A CN114448003A CN202011219225.8A CN202011219225A CN114448003A CN 114448003 A CN114448003 A CN 114448003A CN 202011219225 A CN202011219225 A CN 202011219225A CN 114448003 A CN114448003 A CN 114448003A
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- 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
- H02J7/00304—Overcurrent 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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application provides a protection circuit and charging device charge relates to the protection technical field that charges, and the protection circuit that charges includes: the device comprises a power conversion protection module and a detection processing module; the power conversion protection module comprises at least two output branches, and each output branch is correspondingly connected with one battery unit; the detection processing module is connected with each battery unit and is also connected with the power conversion protection module, the detection processing module is used for detecting the charging parameters of the battery units, when the charging parameters meet preset conditions, a protection signal is output to the power conversion protection module, and the power conversion protection module carries out protection on the corresponding output branch circuit according to the protection signal. The scheme that this application provided all carries out the detection of charging parameter to every branch road that charges, judges whether need protect according to the charging parameter, and under the condition that the charging parameter satisfies the condition, carries out the protection to this branch road, can not influence the normal charging of other branch roads.
Description
Technical Field
The invention relates to the technical field of charging protection, in particular to a charging protection circuit and a charging device.
Background
The battery system of traditional consumer only has a battery usually, fills or the mode that heavy current fills soon carries out quick charge to it through the high pressure, and the heavy current fills soon to the charger and with the battery between be connected the wire rod and the quality requirement of interface higher, and the high voltage fills soon and need increase one-level buck converter, has influenced efficiency and has increased simultaneously and generate heat. The electric equipment adopting the combined battery structure, such as an unmanned vehicle, an electric automobile and the like, has the advantages that the internal battery is formed by connecting a plurality of battery modules with different voltages in parallel, adopts a multi-path power supply strategy, and has the advantages of high-voltage quick charge and large-current quick charge.
The traditional overcurrent protection circuit only detects the current of the same kind in order to realize overcurrent protection's function, and adopts the consumer of combination formula battery structure, and its inside battery comprises the parallelly connected battery module that polylith voltage is different, adopts the strategy of multichannel power supply, gives every battery module power supply respectively, and traditional overcurrent protection circuit only can detect the protection to charging circuit all the way, can't compromise the protection demand of multichannel power supply.
Disclosure of Invention
The invention aims to provide a charging protection circuit and a charging device, which are used for solving the problems that the conventional multi-path charging device cannot independently protect each charging branch and the like.
The embodiment of the invention can adopt the following technical scheme:
in a first aspect, the present invention provides a charge protection circuit, including: the power conversion protection module and the detection processing module;
the power conversion protection module comprises at least two output branches, and each output branch is correspondingly connected with one battery unit for charging;
the detection processing module is connected with each battery unit, the detection processing module is further connected with the power conversion protection module, the detection processing module is used for detecting the charging parameters of the battery units, when the charging parameters meet preset conditions, a protection signal is output to the power conversion protection module, and the power conversion protection module carries out protection on an output branch circuit of which the charging parameters meet the preset conditions according to the protection signal.
In an optional embodiment, the power conversion protection module comprises a first power conversion circuit and at least two over-current protection circuits;
the first power conversion circuit comprises at least two output branches, and the number of the overcurrent protection circuits is matched with that of the output branches;
the output branch circuit is connected with the battery unit through the overcurrent protection circuit to charge;
the detection processing module is connected with each battery unit and is also electrically connected with the overcurrent protection circuit; the detection processing module is used for detecting the charging parameters of the battery units, and outputting protection signals to the overcurrent protection circuits corresponding to the battery units when the charging parameters meet preset conditions;
and the overcurrent protection circuit performs protection on the output branch circuit according to the protection signal.
In an alternative embodiment, the power conversion protection module includes at least two second power conversion circuits, each of the second power conversion circuits includes an output branch, and the output branches are connected with the battery units;
the detection processing module is connected with each battery unit, is also connected with the second power conversion circuit, and is used for detecting the charging parameters of the battery units and outputting a protection signal to the second power conversion circuit corresponding to the battery unit when the charging parameters meet preset conditions;
the second power conversion circuit is used for protecting the output branch circuit according to the protection signal.
In an optional embodiment, the power conversion protection module includes a first power conversion circuit, a second power conversion circuit, and a plurality of overcurrent protection circuits;
the first power conversion circuit comprises at least one first output branch circuit, the number of the overcurrent protection circuits is matched with that of the first output branch circuits, and the first output branch circuits are connected with the battery units through the overcurrent protection circuits for charging;
the second power conversion circuit comprises a second output branch, and the second output branch is connected with the battery unit;
the detection processing module is connected with each battery unit and is also electrically connected with the overcurrent protection circuit and the second power conversion circuit;
the detection processing module is used for detecting the charging parameters of the battery unit and outputting a protection signal to an overcurrent protection circuit or a second power conversion circuit corresponding to the battery unit when the charging parameters meet preset conditions;
the second power conversion circuit or the overcurrent protection circuit is used for protecting the output branch circuit according to the protection signal.
In an alternative embodiment, performing protection on the output branch comprises: and disconnecting the output branch or limiting the current of the output branch.
In an alternative embodiment, the charging parameters include battery voltage and charging current;
the detection processing module is used for detecting the battery voltage and the charging current of the battery unit, determining an overcurrent reference value of the battery unit under the current battery voltage condition according to the battery voltage, and outputting the protection signal when the charging current is greater than the overcurrent reference value.
In an optional embodiment, the overcurrent protection circuit includes a switching tube, and when the detection processing module outputs a protection signal to the overcurrent protection circuit, the switching tube disconnects the output branch according to the protection signal.
In an optional embodiment, the second power conversion circuit includes a control circuit and a flyback power conversion circuit, and the control circuit is connected to the flyback power conversion circuit;
the detection processing module is connected with the control circuit, and when the detection processing module outputs a protection signal to the second power conversion circuit, the control circuit controls the flyback power conversion circuit to reduce the output current or stop working.
In an optional embodiment, the power conversion protection module stops performing protection when the detection processing module stops outputting the protection signal.
In a second aspect, the present invention provides a charging device comprising a charging protection circuit as described in any one of the preceding embodiments.
For prior art, this embodiment provides a charging protection circuit and charging device, the charging protection circuit includes: the power conversion protection module and the detection processing module; the power conversion protection module comprises at least two output branches, and each output branch is correspondingly connected with one battery unit for charging; the detection processing module is connected with each battery unit, the detection processing module is further connected with the power conversion protection module, the detection processing module is used for detecting the charging parameters of the battery units, when the charging parameters meet preset conditions, a protection signal is output to the power conversion protection module, and the power conversion protection module carries out protection on an output branch circuit of which the charging parameters meet the preset conditions according to the protection signal. The scheme that this application provided all carries out the detection of charging parameter to every branch road that charges, judges whether need protect according to the charging parameter, and under the condition that the charging parameter satisfies the condition, carries out the protection to this branch road, can not influence the normal charging of other branch roads.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a schematic diagram of a charge protection circuit provided in the present embodiment;
fig. 2 shows a schematic diagram of a charge protection circuit provided in this embodiment;
fig. 3 is a schematic diagram illustrating a circuit structure of a charge protection circuit according to the present embodiment;
fig. 4 is a schematic diagram of another charge protection circuit provided in the present embodiment;
fig. 5 is a schematic circuit diagram illustrating another charge protection circuit provided in this embodiment;
fig. 6 shows a schematic diagram of another charge protection circuit provided in this embodiment.
An icon: 100-a charge protection circuit; 110-a power conversion protection module; 130-a detection processing module; 111-a first power conversion circuit; 112-a first over-current protection circuit; 113-a second over-current protection circuit; 114-a second power conversion circuit a; 115-second power conversion circuit B; 116-a second power conversion circuit; 300-battery pack.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The charging efficiency is an important parameter for evaluating the performance of the charging device, for charging the electric equipment, taking a smart phone as an example, no matter the traditional 5V/1A charging mode or other quick charging schemes with various protocols are adopted, the output of the charging circuit is only one path, and the charging of the internal battery of the electric equipment is realized through the path.
The inside battery system of traditional consumer only has a battery to constitute usually, fills or the mode that heavy current fills soon through the high pressure carries out quick charge to it, and the heavy current fills soon and is higher to the quality requirement of connecting wire rod and interface between charger and consumer's the battery, and high voltage fills soon and need increase one-level buck converter, has influenced charge efficiency and still can increase the generating heat of charging process simultaneously.
The battery in the electric equipment adopting the combined battery structure is formed by connecting at least two battery modules or battery units in parallel, a multi-path power supply strategy is adopted to charge each battery module respectively, and the charging voltage is high or low, and the power supply current is large or small, so that the quick charging scheme for charging the combined battery by multi-path output voltage can simultaneously have the advantages of high-voltage quick charging and large-current quick charging, and simultaneously the defects of the two schemes are reduced or avoided.
The quick charging scheme of the combined battery power supply by adopting multiple paths of different voltage outputs cannot be suitable for the traditional function of only detecting one path of current to realize overcurrent protection.
Referring to fig. 1, fig. 1 shows a schematic diagram of a charging protection circuit 100 according to the present embodiment, the charging protection circuit 100 is used for connecting a battery pack 300 to charge the battery pack 300, and the charging protection circuit 100 includes: a power conversion protection module 110 and a detection processing module 130.
The battery pack 300 includes at least two battery units, the power conversion protection module 110 includes at least two output branches, each output branch is correspondingly connected with one battery unit for charging, the power conversion protection module 110 is used for converting an input power signal, different battery units are charged through each output branch, each output branch is charged independently and not mutually influenced, and the charging voltage and the charging current of different output branches can be the same or different.
The detection processing module 130 is connected to each battery unit, the detection processing module 130 is further connected to the power conversion protection module 110, the detection processing module 130 is configured to detect charging parameters of the battery units, such as battery voltage, charging current, and the like, when the charging parameter of a certain battery unit or an output branch meets a preset condition, the detection processing module 130 outputs a protection signal to the power conversion protection module 110, and the power conversion protection module 110 performs protection on the output branch whose charging parameter meets the preset condition according to the protection signal, for example, limits the charging current of the output branch, or disconnects the output branch.
The scheme provided by the embodiment detects the charging parameters of each charging branch, judges whether protection is needed according to the charging parameters, and under the condition that the charging parameters meet the preset conditions, the detection processing module 130 outputs protection signals to the power conversion protection module 110, and the rate conversion protection module performs protection on the branch, so that normal charging of other branches cannot be influenced, charging of the whole battery pack 300 cannot be influenced due to problems such as overcurrent of a certain branch, and the charging efficiency is improved.
The power conversion protection module 110 is configured to charge the battery unit through at least two output branches, and protect the output branches meeting the condition according to the detected protection signal of the module. The power conversion protection module 110 may have different structures, and the power conversion protection module 110 with different structures may implement different protection forms for the output branches. The charging protection circuit 100 provided in the present embodiment is exemplified by several possible implementations.
In some possible implementations, the power conversion protection module 110 includes a first power conversion circuit 111 and at least two over-current protection circuits. The first power conversion circuit 111 includes at least two output branches, the number of the overcurrent protection circuits matches the number of the output branches, that is, each output branch is provided with an overcurrent protection circuit, and the output branch is connected with the battery unit through the overcurrent protection circuit for charging.
In this embodiment, the detection processing module 130 is configured to detect a charging parameter of the battery unit, output a protection signal to the over-current protection circuit corresponding to the battery unit when the charging parameter satisfies a preset condition, and then the over-current protection circuit performs protection on the output branch according to the protection signal.
Referring to fig. 2, in the present embodiment, the first power conversion circuit 111 includes 2 output branches for illustration, and the power conversion protection module 110 includes a first overcurrent protection circuit 112 and a second overcurrent protection circuit 113 corresponding to the number of the output branches, and accordingly, the circuits can charge the battery pack 300 including the battery unit 1 and the battery unit 2.
The output branch circuit 1 is connected with the battery unit 1 through the first overcurrent protection circuit 112, the output branch circuit 2 is connected with the battery unit 2 through the second overcurrent protection circuit 113, the detection processing module 130 is connected with both the battery unit 1 and the battery unit 2 to detect the charging parameters of the battery unit 1 and the battery unit 2, and when the charging parameter of a certain battery unit is abnormal, the detection processing module 130 outputs a protection signal to the corresponding overcurrent protection circuit, so that the overcurrent protection circuit protects the output branch circuit.
In this embodiment, the charging parameters include a battery voltage and a charging current, the detection processing module 130 detects the battery voltage and the charging current of the battery unit, determines a current charging state and an overcurrent reference value corresponding to the current battery voltage state according to a real-time voltage amplitude of the battery unit, compares the overcurrent reference value with the real-time charging current of the battery unit, determines that the charging parameter of the battery unit satisfies a condition if the charging current exceeds the overcurrent reference value corresponding to the overcurrent reference value, outputs a protection signal to a corresponding overcurrent protection circuit, and enables the overcurrent protection circuit to start a protection measure, where the protection measure includes circuit disconnection or current limitation.
For example, when the detection processing module 130 detects that the battery voltage of the battery unit 1 is close to its nominal value, the battery unit 1 is close to full charge, and is in a trickle charge state, the corresponding over-current reference value in the voltage state is Iref1, when it detects that the charging current of the battery unit 1 at this moment is increased to I1, if I1 is greater than or equal to Iref1, it is considered that a charging over-current abnormal state occurs in the battery unit 1, the detection processing module 130 generates an over-current protection signal I1_ OV and transmits the over-current protection signal to the first over-current protection circuit 112, and when the first over-current protection circuit 112 receives the over-current protection signal I1_ OV, an over-current protection action is initiated, and the charging branch transmitted from the first power conversion circuit 111 to the battery unit 1 is disconnected, so as to reduce the value of the charging current flowing through the battery unit 1. When the detection processing module 130 detects that the state of the battery unit 1 has exited the overcurrent state (the charging parameter does not satisfy the above condition), it will notify the system to enter the overcurrent abnormal recovery state, and stop the overcurrent protection.
Referring to fig. 3, fig. 3 is a schematic diagram of a specific implementation circuit of the foregoing embodiment, in the implementation shown in fig. 3, the first power conversion circuit 111 is a flyback power converter having two output branches (VO1, VO2), and the control circuit controls an operating state of the flyback power converter according to a signal transmitted by the closed-loop feedback circuit. When the detection processing module 130 detects that an overcurrent abnormality occurs in a certain battery cell during charging and provides an overcurrent protection signal, the corresponding power switch in the overcurrent protection circuit is turned off, and a charging loop from an output branch of the flyback power conversion circuit to the battery cell with the overcurrent abnormality is cut off, so that the battery cell is prevented from being damaged.
In the above embodiment, the overcurrent protection circuit performs the protection action, in some other possible implementation manners, the power conversion protection module 110 may also be in other forms, for example, the power conversion protection module 110 includes at least two second power conversion circuits, each second power conversion circuit includes only one output branch, the output branch is connected to the battery unit, the detection processing module 130 is connected to each battery unit, the detection processing module 130 is further connected to the second power conversion circuit, the detection processing module 130 is configured to detect a charging parameter of the battery unit, and when the charging parameter meets a preset condition, output a protection signal to the second power conversion circuit corresponding to the battery unit; the second power conversion circuit is used for protecting the output branch circuit according to the protection signal.
Referring to fig. 4, the power conversion protection module 110 includes two second power conversion circuits for illustration in the present embodiment, the power conversion protection module 110 includes a second power conversion circuit a114 and a second power conversion circuit B115, and an output branch of the second power conversion circuit a114 is connected to the battery unit 1; the output branch of the second power conversion circuit B115 is connected to the battery unit 2. The detection processing module 130 is connected to each battery unit, the detection processing module 130 is further connected to each second power conversion circuit, the detection processing module 130 detects charging parameters of the battery units, including battery voltage and charging current, when the charging parameters satisfy a preset condition, the detection processing module 130 outputs a protection signal to the corresponding second power conversion circuit, and the second power conversion circuit performs protection according to the protection signal.
For example, the detection processing module 130 detects the charging parameters of the battery unit 1 in real time, where the charging parameters include the battery voltage and the charging current of the battery unit 1, determines the charging state of the current battery unit 1 and the corresponding over-current protection reference value in the current voltage state according to the battery voltage, and when the detected charging current exceeds the over-current protection reference value, the detection processing module 130 directly transmits the protection signal to the second power conversion circuit a114, and the second power conversion circuit a114 starts over-current protection according to the protection signal.
Referring to fig. 5, fig. 5 is a schematic diagram of a circuit structure for implementing the schematic diagram shown in fig. 4. In the embodiment shown in fig. 5, the power conversion protection module 110 includes two independent flyback power conversion circuits, and each power conversion circuit has one output to charge the corresponding battery unit. When an abnormal overcurrent occurs in a certain battery cell, the detection processing module 130 transmits a protection signal to the corresponding control circuit of the flyback power conversion circuit, and the overcurrent protection action of the flyback power conversion circuit is realized through the control circuit, including limiting the output current of the flyback power conversion circuit or directly stopping the operation of the flyback power conversion circuit. In some possible implementations, the control circuit is connected to the flyback power conversion circuit; the detection processing module 130 is connected to the control circuit, and when the detection processing module 130 outputs a protection signal to the second power conversion circuit, the control circuit controls the flyback power conversion circuit to reduce the output current or stop working.
It can be understood that each power conversion circuit inside the power conversion protection module 110 may be controlled by a unified control circuit, or may be controlled by a plurality of control circuits.
In some possible implementations, the power conversion protection module 110 may further include a first power conversion circuit 111, a second power conversion circuit, and a plurality of over-current protection circuits at the same time; the first power conversion circuit 111 comprises at least one first output branch, the number of the overcurrent protection circuits is matched with that of the first output branches, and the first output branches are connected with the battery units through the overcurrent protection circuits for charging; the second power conversion circuit comprises a second output branch circuit, and the second output branch circuit is connected with the battery unit; the detection processing module 130 is connected to each battery unit, and the detection processing module 130 is further electrically connected to the over-current protection circuit and the second power conversion circuit.
The detection processing module 130 is configured to detect a charging parameter of the battery unit, and output a protection signal to an overcurrent protection circuit or a second power conversion circuit corresponding to the battery unit when the charging parameter meets a preset condition; the second power conversion circuit or the overcurrent protection circuit is used for protecting the output branch circuit according to the protection signal.
Referring to fig. 6, for example, the power conversion protection module 110 includes a first power conversion circuit 111 and a second power conversion circuit 116, where the first power conversion circuit 111 includes 2 output branches, and similarly, the 2 output branches respectively correspond to the first overcurrent protection circuit 112 and the second overcurrent protection circuit 113, and respectively charge the battery unit 1 and the battery unit 2; the second power conversion circuit 116 includes an output branch for charging the battery unit 3, and it is understood that the battery unit 1, the battery unit 2, and the battery unit 3 are different battery units in the same battery pack 300.
The detection processing module 130 detects charging parameters of 3 battery cells in the battery pack 300 respectively to determine whether each battery cell has an overcurrent abnormal condition during the charging process, if so, a protection signal is generated, the protection signal of the battery cell 1 is transmitted to the first overcurrent protection circuit 112, the protection signal of the battery cell 2 is transmitted to the second overcurrent protection circuit 113, and the first overcurrent protection circuit 112 and the second overcurrent protection circuit 113 execute related actions of overcurrent protection according to the respective protection signals, so as to protect the corresponding battery module from abnormal damage.
The detection processing module 130 detects the charging parameter of the battery unit 3, determines whether an overcurrent abnormality occurs in the battery unit 3 according to the charging parameter, generates a protection signal if the overcurrent abnormality occurs, transmits the protection signal of the battery unit 3 to the second power conversion circuit 116, and performs an overcurrent protection operation by the second power conversion circuit 116.
It is understood that the power conversion protection module 110 may further include more first power conversion circuits 111 or second power conversion circuits 116, which is not limited in this embodiment.
In some possible implementations, performing protection on the output branch includes: the output branch is disconnected or limited, but not limited to this, and other protection measures may also be performed, which is not limited in this embodiment.
In some possible implementations, in the case that the detection processing module 130 stops outputting the protection signal, the power conversion protection module 110 stops performing protection, and the output branch resumes normal charging.
An embodiment of the present invention further provides a charging device (not shown in the drawings), where the charging device includes the charging protection circuit provided in the foregoing embodiment.
To sum up, the present embodiment provides a charging protection circuit and a charging device, and the charging protection circuit includes: the power conversion protection module and the detection processing module; the power conversion protection module comprises at least two output branches, and each output branch is correspondingly connected with one battery unit for charging; the detection processing module is connected with each battery unit and is also connected with the power conversion protection module, the detection processing module is used for detecting the charging parameters of the battery units, when the charging parameters meet preset conditions, a protection signal is output to the power conversion protection module, and the power conversion protection module carries out protection on an output branch circuit of which the charging parameters meet the preset conditions according to the protection signal. The scheme that this application provided all carries out the detection of charging parameter to every branch road that charges, judges whether need protect according to the charging parameter, and under the condition that the charging parameter satisfies the condition, to this branch road execution protection that charges, can not influence the normal charging of other branch roads that charge.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A charge protection circuit, comprising: the power conversion protection module and the detection processing module;
the power conversion protection module comprises at least two output branches, and each output branch is correspondingly connected with one battery unit for charging;
the detection processing module is connected with each battery unit, the detection processing module is further connected with the power conversion protection module, the detection processing module is used for detecting the charging parameters of the battery units, when the charging parameters meet preset conditions, a protection signal is output to the power conversion protection module, and the power conversion protection module carries out protection on an output branch circuit of which the charging parameters meet the preset conditions according to the protection signal.
2. The charge protection circuit of claim 1, wherein the power conversion protection module comprises a first power conversion circuit and at least two over-current protection circuits;
the first power conversion circuit comprises at least two output branches, and the number of the overcurrent protection circuits is matched with that of the output branches;
the output branch circuit is connected with the battery unit through the overcurrent protection circuit to charge;
the detection processing module is connected with each battery unit and is also electrically connected with the overcurrent protection circuit; the detection processing module is used for detecting the charging parameters of the battery units, and outputting protection signals to the overcurrent protection circuits corresponding to the battery units when the charging parameters meet preset conditions;
and the overcurrent protection circuit performs protection on the output branch circuit according to the protection signal.
3. The charge protection circuit of claim 1, wherein said power conversion protection module comprises at least two second power conversion circuits, each of said second power conversion circuits comprising an output branch, said output branches being connected to said battery cells;
the detection processing module is connected with each battery unit, is also connected with the second power conversion circuit, and is used for detecting the charging parameters of the battery units and outputting a protection signal to the second power conversion circuit corresponding to the battery unit when the charging parameters meet preset conditions;
the second power conversion circuit is used for protecting the output branch circuit according to the protection signal.
4. The charge protection circuit of claim 1, wherein the power conversion protection module comprises a first power conversion circuit, a second power conversion circuit and a plurality of over-current protection circuits;
the first power conversion circuit comprises at least one first output branch circuit, the number of the overcurrent protection circuits is matched with that of the first output branch circuits, and the first output branch circuits are connected with the battery units through the overcurrent protection circuits for charging;
the second power conversion circuit comprises a second output branch, and the second output branch is connected with the battery unit;
the detection processing module is connected with each battery unit and is also electrically connected with the overcurrent protection circuit and the second power conversion circuit;
the detection processing module is used for detecting the charging parameters of the battery unit and outputting a protection signal to an overcurrent protection circuit or a second power conversion circuit corresponding to the battery unit when the charging parameters meet preset conditions;
the second power conversion circuit or the overcurrent protection circuit is used for protecting the output branch circuit according to the protection signal.
5. The charging protection circuit according to any one of claims 1 to 4, wherein the protection of the output branch comprises: and disconnecting the output branch or limiting the current of the output branch.
6. The charging protection circuit according to any one of claims 1 to 4, wherein the charging parameters include a battery voltage and a charging current;
the detection processing module is used for detecting the battery voltage and the charging current of the battery unit, determining an overcurrent reference value of the battery unit under the current battery voltage condition according to the battery voltage, and outputting the protection signal when the charging current is greater than the overcurrent reference value.
7. The charging protection circuit of claim 2, wherein the over-current protection circuit comprises a switching tube, and when the detection processing module outputs a protection signal to the over-current protection circuit, the switching tube disconnects the output branch according to the protection signal.
8. The charging protection circuit of claim 3, wherein the second power conversion circuit comprises a control circuit and a flyback power conversion circuit, and the control circuit is connected with the flyback power conversion circuit;
the detection processing module is connected with the control circuit, and when the detection processing module outputs a protection signal to the second power conversion circuit, the control circuit controls the flyback power conversion circuit to reduce the output current or stop working.
9. The charging protection circuit of claim 1, wherein the power conversion protection module stops performing protection when the detection processing module stops outputting the protection signal.
10. A charging device comprising the charging protection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011219225.8A CN114448003A (en) | 2020-11-04 | 2020-11-04 | Charging protection circuit and charging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011219225.8A CN114448003A (en) | 2020-11-04 | 2020-11-04 | Charging protection circuit and charging device |
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| Publication Number | Publication Date |
|---|---|
| CN114448003A true CN114448003A (en) | 2022-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011219225.8A Pending CN114448003A (en) | 2020-11-04 | 2020-11-04 | Charging protection circuit and charging device |
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| Country | Link |
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| CN (1) | CN114448003A (en) |
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2020
- 2020-11-04 CN CN202011219225.8A patent/CN114448003A/en active Pending
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