CN217981612U - Charging and discharging current detection circuit of rechargeable battery and electronic device with rechargeable battery - Google Patents
Charging and discharging current detection circuit of rechargeable battery and electronic device with rechargeable battery Download PDFInfo
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- CN217981612U CN217981612U CN202221014962.9U CN202221014962U CN217981612U CN 217981612 U CN217981612 U CN 217981612U CN 202221014962 U CN202221014962 U CN 202221014962U CN 217981612 U CN217981612 U CN 217981612U
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Abstract
The application relates to the technical field of rechargeable batteries and discloses a rechargeable battery charge-discharge current detection circuit, which comprises: a battery charging current detection circuit and a battery discharging current detection circuit; the battery charging current detection circuit is connected between a reference ground of the charging battery charging and discharging current detection circuit and a ground end of the charging circuit of the charging battery so as to detect current when the charging battery is charged, and a current sampling end of the battery charging current detection circuit is connected with a first current detection end of the controller; and the battery discharge current detection circuit is connected between the reference ground and the ground end of the discharge circuit of the rechargeable battery so as to detect current when the rechargeable battery is discharged, and the current sampling end of the battery discharge current detection circuit is connected with the second current detection end of the controller. The application also discloses an electronic device with the rechargeable battery. The accuracy of detecting the charging and discharging state of the rechargeable battery can be improved.
Description
Technical Field
The present disclosure relates to rechargeable batteries, and particularly to a rechargeable battery charging/discharging current detection circuit and an electronic device having the same.
Background
Currently, rechargeable batteries are widely used in various electronic devices, such as a charger. When the electric quantity of the rechargeable battery is not large, the charger can charge the rechargeable battery through the charging circuit after the power supply is switched on; when the rechargeable battery is needed to drive the load connected with the charging treasure, the rechargeable battery supplies power to the load connected with the charging treasure through the discharging circuit. Currently, the charging state and the discharging state of the rechargeable battery are detected by detecting the voltage of the rechargeable battery, such as detecting the charging amount of the rechargeable battery or detecting the discharging amount of the rechargeable battery. However, when the rechargeable battery is charged and discharged, the voltage change of the rechargeable battery is not obvious, so that the detection of the charging and discharging state by detecting the voltage of the rechargeable battery is not accurate enough.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, an object of the present invention is to provide a charging/discharging current detection circuit for a rechargeable battery and an electronic device having the same, which can improve the accuracy of detecting the charging/discharging state of the rechargeable battery.
In order to achieve the above object, an embodiment of the present application provides a charging/discharging current detection circuit for a rechargeable battery, including:
the battery charging current detection circuit is connected between a reference ground of the charging battery charging and discharging current detection circuit and a ground end of a charging circuit of the charging battery so as to detect current when the charging battery is charged, and a current sampling end of the battery charging current detection circuit is connected with a first current detection end of the controller; and
and the battery discharge current detection circuit is connected between the reference ground and the ground end of the discharge circuit of the rechargeable battery so as to detect current when the rechargeable battery is discharged, and the current sampling end of the battery discharge current detection circuit is connected with the second current detection end of the controller.
As an improvement of the above aspect, the battery charging current detection circuit includes: a charging current detection resistor; one end of the charging current detection resistor is used for being connected with the ground end of the charging circuit, the other end of the charging current detection resistor is connected with the reference ground, and the other end of the charging current detection resistor is also used for being connected with the first current detection end of the controller.
As an improvement of the above aspect, the battery discharge current detection circuit includes: a discharge current detection resistor; one end of the discharge current detection resistor is used for being connected with the ground end of the discharge circuit, the other end of the discharge current detection resistor is connected with the reference ground, and the one end of the discharge current detection resistor is also used for being connected with the second current detection end of the controller.
As an improvement of the above solution, the charging/discharging current detection circuit for a rechargeable battery further includes: a first current limiting circuit and a second current limiting circuit;
the first current limiting circuit is connected between the current sampling end of the battery charging current detection circuit and the first current detection end of the controller;
the second current limiting circuit is connected between the current sampling end of the battery discharge current detection circuit and the second current detection end of the controller.
As an improvement of the above aspect, the first current limiting circuit includes: a first current limiting resistor; the first current limiting resistor is connected between the current sampling end of the battery charging current detection circuit and the first current detection end of the controller;
the second current limiting circuit includes: a second current limiting resistor; the second current limiting resistor is connected between the current sampling end of the battery discharge current detection circuit and the second current detection end of the controller.
As an improvement of the above solution, the charging/discharging current detection circuit for a rechargeable battery further includes: a first filter circuit and a second filter circuit;
one end of the first filter circuit is connected between the current sampling end of the battery charging current detection circuit and the first current detection end of the controller, and the other end of the first filter circuit is connected with the reference ground;
one end of the second filter circuit is connected between the current sampling end of the battery discharge current detection circuit and the second current detection end of the controller, and the other end of the second filter circuit is connected with the reference ground.
As an improvement of the above aspect, the first filter circuit includes: a first filter capacitor; one end of the first filter capacitor is connected between the current sampling end of the battery charging current detection circuit and the first current detection end of the controller, and the other end of the first filter capacitor is connected with the reference ground;
the second filter circuit includes: a second filter capacitor; one end of the second filter capacitor is connected between the current sampling end of the battery discharge current detection circuit and the second current detection end of the controller, and the other end of the second filter capacitor is connected with the reference ground.
As an improvement of the above solution, the charging/discharging current detection circuit for a rechargeable battery further includes: a first current amplifying circuit and a second current amplifying circuit;
the first current amplifying circuit is connected between the current sampling end of the battery charging current detection circuit and the first current detection end of the controller;
the second current amplifying circuit is connected between the current sampling end of the battery discharge current detection circuit and the second current detection end of the controller.
As an improvement of the above aspect, the first current amplifying circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first operational amplifier, a first capacitor and a second capacitor;
the inverting input end of the first operational amplifier is connected with the current sampling end of the battery charging current detection circuit through the first resistor; the non-inverting input end of the first operational amplifier is connected with the reference ground through the second resistor; one end of the third resistor is connected between the other end of the second resistor and the non-inverting input end of the first operational amplifier, and the other end of the third resistor is connected with the reference ground; the output end of the first operational amplifier is connected with the first current detection end of the controller through the fourth resistor; one end of the fifth resistor is connected between the other end of the first resistor and the inverting input end of the first operational amplifier, and the other end of the fifth resistor is connected between the output end of the first operational amplifier and the fourth resistor; one end of the first capacitor is connected between the fourth resistor and the first current detection end of the controller, and the other end of the first capacitor is connected with the reference ground; one end of the second capacitor is connected with a power supply end of the first operational amplifier, and the other end of the second capacitor is connected with the reference ground;
the second current amplifying circuit includes: the circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second operational amplifier and a third capacitor;
the inverting input end of the second operational amplifier is connected with the current sampling end of the battery discharge current detection circuit through the sixth resistor; the non-inverting input end of the second operational amplifier is connected with the reference ground through the seventh resistor; one end of the eighth resistor is connected between the other end of the seventh resistor and the non-inverting input end of the second operational amplifier, and the other end of the eighth resistor is connected with the reference ground; the output end of the second operational amplifier is connected with the second current detection end of the controller through the ninth resistor; one end of the tenth resistor is connected between the other end of the sixth resistor and the inverting input end of the second operational amplifier, and the other end of the tenth resistor is connected between the output end of the second operational amplifier and the ninth resistor; one end of the third capacitor is connected between the ninth resistor and the second current detection end of the controller, and the other end of the third capacitor is connected with the reference ground.
Another embodiment of the present application further provides an electronic device with a rechargeable battery, which includes a rechargeable battery, a charging circuit, a discharging circuit, a controller, and the rechargeable battery charging/discharging current detection circuit according to any of the embodiments above;
the rechargeable battery is connected with the charging circuit; the battery charging current detection circuit is connected between the reference ground and the ground end of the charging circuit, and the current sampling end of the battery charging current detection circuit is connected with the first current detection end of the controller;
the rechargeable battery is also connected with the discharge circuit; the battery discharge current detection circuit is connected between the reference ground and the ground end of the discharge circuit, and the current sampling end of the battery discharge current detection circuit is connected with the second current detection end of the controller;
the controller is used for calculating the electric quantity of the rechargeable battery according to the currents detected by the first current detection end and the second current detection end.
Compared with the prior art, the charging and discharging current detection circuit for the rechargeable battery and the electronic device with the rechargeable battery provided by the embodiment of the application have at least one of the following advantages:
the controller can accurately detect the charging current of the rechargeable battery through the battery charging current detection circuit, so that the charging state of the rechargeable battery can be accurately detected; the controller can accurately detect the discharge current of the rechargeable battery through the battery discharge current detection circuit, so that the discharge state of the rechargeable battery can be accurately detected. Therefore, the accuracy of detecting the charging and discharging states of the rechargeable battery can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings required to be used in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a charging/discharging current detection circuit for a rechargeable battery according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another charging/discharging current detection circuit for a rechargeable battery according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a charging/discharging current detection circuit for a rechargeable battery according to an embodiment of the present disclosure;
fig. 4 is a specific circuit schematic diagram of a charging/discharging current detection circuit for a rechargeable battery according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a charging/discharging current detection circuit for a rechargeable battery according to an embodiment of the present disclosure;
FIG. 6 is a specific circuit diagram of the first current amplifying circuit in FIG. 5;
FIG. 7 is a specific circuit diagram of the second current amplifying circuit shown in FIG. 5;
fig. 8 is a schematic circuit structure diagram of an electronic device with a rechargeable battery according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Where the terms first, second and the like in the description and in the claims are used for descriptive purposes only to distinguish one element from another, they are not to be construed as indicating or implying any relative importance or implicit indication of the number of elements indicated, nor necessarily as describing an order or chronological order. The terms are interchangeable where appropriate. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include at least one of the feature.
Furthermore, reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1, an embodiment of the present application provides a charging/discharging current detection circuit for a rechargeable battery, including: a battery charging current detection circuit 2 and a battery discharging current detection circuit 3; the battery charging current detection circuit 2 is connected between a reference ground GND of the charging battery charging and discharging current detection circuit and a ground terminal BGND of a charging circuit of a rechargeable battery so as to detect current when the rechargeable battery is charged, and a current sampling terminal of the battery charging current detection circuit 2 is connected with a first current detection terminal In1 of the controller 6; the battery discharge current detection circuit 3 is connected between the ground reference GND and the ground terminal PGND of the discharge circuit of the rechargeable battery to detect current when the rechargeable battery is discharged, and a current sampling terminal thereof is connected to the second current detection terminal In2 of the controller 6.
The working principle of the embodiment is as follows: when the rechargeable battery is charged by the charging circuit, a voltage difference exists between a ground terminal BGND of the charging circuit and the ground reference GND, and a current flows through the battery charging current detection circuit 2 to be detected, at this time, the battery charging current detection circuit 2 feeds back a current sampling signal to the first current detection terminal In1 of the controller 6 through a current sampling terminal thereof, so that the controller 6 can accurately detect the charging current of the rechargeable battery, and the charging state of the rechargeable battery can be accurately detected. When the rechargeable battery is discharged through the discharge circuit, a voltage difference exists between the ground terminal PGND of the discharge circuit and the reference ground GND, a current flows through the battery discharge current detection circuit 3 to be detected, and the battery discharge current detection circuit 3 feeds back a current sampling signal to the second current detection terminal In2 of the controller 6 through the current sampling terminal thereof, so that the controller 6 can accurately detect the discharge current of the rechargeable battery, and the discharge state of the rechargeable battery can be accurately detected.
From the above analysis, the controller can accurately detect the charging current of the rechargeable battery through the battery charging current detection circuit, so that the charging state of the rechargeable battery can be accurately detected; the controller can accurately detect the discharge current of the rechargeable battery through the battery discharge current detection circuit, so that the discharge state of the rechargeable battery can be accurately detected. Therefore, the charging and discharging state detection method and device can improve the accuracy of charging and discharging state detection of the rechargeable battery.
As an example, when the charging circuit is in operation, the voltage of the ground terminal BGND of the charging circuit is slightly higher than the zero point voltage of the ground reference GND, for example, the voltage of the ground terminal BGND of the charging circuit is a positive voltage of 0.1 to 1V, so that a voltage difference is formed between the ground terminal BGND of the charging circuit and the ground reference GND; when the discharge circuit works, the voltage of the ground terminal PGND of the discharge circuit is slightly lower than the zero point voltage of the reference ground GND, for example, the voltage of the ground terminal PGND of the discharge circuit is a negative voltage of-0.1 to-1V, so that a voltage difference is formed between the ground terminal PGND of the discharge circuit and the reference ground GND.
As an example, the controller 6 is configured to calculate a charging amount and a discharging amount of the rechargeable battery according to the currents detected by the first current detecting terminal and the second current detecting terminal In2, so as to accurately measure how much power the rechargeable battery has. Specifically, the charge amount of the rechargeable battery = the charge amount of the battery-the discharge amount of the battery. Further, the ground reference GND is, as an example, a ground reference of the controller 6 (which may be a charging chip in particular).
In one embodiment, referring to fig. 4, the battery charging current detection circuit 2 includes: a charging current detection resistor Rc; one end of the charging current detection resistor Rc is configured to be connected to the ground terminal BGND of the charging circuit, the other end of the charging current detection resistor Rc is connected to the ground GND, and the one end of the charging current detection resistor Rc is further configured to be connected to the first current detection terminal In1 of the controller 6. In this embodiment, when the rechargeable battery is charged by the charging circuit, a voltage difference is formed between the ground terminal BGND of the charging circuit and the ground reference GND, a charging current of the charging circuit flows through the charging current detection resistor Rc after coming out from the ground terminal BGND of the charging circuit, and at this time, the charging current detection resistor Rc feeds back a current sampling signal to the first current detection terminal In1 of the controller 6, so that the controller 6 can accurately detect the charging current of the rechargeable battery.
In one embodiment, referring to fig. 4, the battery discharge current detection circuit 3 includes: a discharge current detection resistor Rf; one end of the discharge current detection resistor Rf is configured to be connected to a ground terminal PGND of the discharge circuit, the other end of the discharge current detection resistor Rf is connected to the ground GND, and the one end of the discharge current detection resistor Rf is further configured to be connected to the second current detection terminal In2 of the controller 6. In this embodiment, when the rechargeable battery is discharged through the discharge circuit, a voltage difference is formed between the ground terminal PGND of the discharge circuit and the ground reference GND, a discharge current of the discharge circuit flows through the discharge current detection resistor Rf after coming out from the ground terminal PGND of the discharge circuit, and at this time, the discharge current detection resistor Rf feeds back a current sampling signal to the second current detection terminal In2 of the controller 6, so that the controller 6 can accurately detect the discharge current of the rechargeable battery.
As an example, the resistance values of both the charging current detection resistor Rc and the discharging current detection resistor Rf may be 1 to 100 milliohms, for example, 10 milliohms. It is understood that the circuit structures of the battery charging current detection circuit 2 and the battery discharging current detection circuit 3 may also be other existing current detection circuit structures, and are not limited in particular herein.
In one embodiment, referring to fig. 2, the charging/discharging current detection circuit for a rechargeable battery further includes: a first current limiting circuit 7 and a second current limiting circuit 8; the first current limiting circuit 7 is connected between the current sampling end of the battery charging current detection circuit 2 and the first current detection end In1 of the controller 6; the second current limiting circuit 8 is connected between the current sampling terminal of the battery discharge current detection circuit 3 and the second current detection terminal In2 of the controller 6. In this embodiment, by providing the first current limiting circuit 7, the current limiting protection can be performed on the first current detection terminal In1 of the controller 6, so as to ensure the safety and accuracy of the charging current detection performed by the controller 6; through the arrangement of the second current limiting circuit 8, the second current detection end In2 of the controller 6 can be subjected to current limiting protection, and the safety and accuracy of the controller 6 for detecting the discharge current are ensured.
As an example, referring to fig. 4, the first current limiting circuit 7 includes: a first current limiting resistor Rx1; the first current limiting resistor Rx1 is connected between the current sampling terminal of the battery charging current detection circuit 2 and the first current detection terminal In1 of the controller 6; the second current limiting circuit 8 includes: a second current limiting resistor; the second current limiting resistor is connected between the current sampling end of the battery discharge current detection circuit 3 and the second current detection end In2 of the controller 6. As an example, the resistance values of both the first current limiting resistor Rx1 and the second current limiting resistor may be 100-10K ohms, for example, 1K ohm. It is understood that the circuit structure of the first current limiting circuit 7 and the second current limiting circuit 8 may also be other existing current limiting circuit structures, and is not limited in particular herein.
In one embodiment, referring to fig. 3, the charging/discharging current detecting circuit for a rechargeable battery further includes: a first filter circuit 9 and a second filter circuit 10; one end of the first filter circuit 9 is connected between the current sampling end of the battery charging current detection circuit 2 and the first current detection end In1 of the controller 6, and the other end of the first filter circuit 9 is connected to the ground GND; one end of the second filter circuit 10 is connected between the current sampling terminal of the battery discharge current detection circuit 3 and the second current detection terminal In2 of the controller 6, and the other end of the second filter circuit 10 is connected to the ground GND. In this embodiment, by providing the first filter circuit 9, the current signal to be received by the first current detection terminal In1 of the controller 6 may be filtered, so as to improve the anti-interference capability of the controller 6 for detecting a charging current signal; by arranging the second filter circuit 10, the current signal to be received by the second current detection terminal In2 of the controller 6 can be filtered, and the anti-interference capability of the controller 6 for detecting the discharge current signal is improved.
As an example, with reference to fig. 4, the first filter circuit 9 comprises: a first filter capacitor Cb1; one end of the first filter capacitor Cb1 is connected between the current sampling end of the battery charging current detection circuit 2 and the first current detection end In1 of the controller 6, and the other end of the first filter capacitor Cb1 is connected to the ground GND; the second filter circuit 10 includes: a second filter capacitor Cb2; one end of the second filter capacitor Cb2 is connected between the current sampling end of the battery discharge current detection circuit 3 and the second current detection end In2 of the controller 6, and the other end of the second filter capacitor Cb2 is connected to the ground GND. As an example, both the first filter capacitor Cb1 and the second filter capacitor Cb2 may be 10-1000 nanofarads, for example, 100 nanofarads. It is to be understood that the circuit structure of the first filter circuit 9 and the second filter circuit 10 may also be other existing filter circuit structures, and is not limited in particular herein.
In one embodiment, referring to fig. 5, the charging/discharging current detection circuit for a rechargeable battery further includes: a first current amplification circuit 11 and a second current amplification circuit 12; the first current amplifying circuit 11 is connected between a current sampling terminal of the battery charging current detecting circuit 2 and the first current detecting terminal In1 of the controller 6; the second current amplifying circuit 12 is connected between the current sampling terminal of the battery discharge current detecting circuit 3 and the second current detecting terminal In2 of the controller 6. In this embodiment, by providing the first current amplifying circuit 11, the weak current signal detected by the battery charging current detecting circuit 2 can be properly amplified, so that the first current detecting terminal In1 of the controller 6 can detect the weak current signal, thereby improving the capability of the controller 6 In detecting the charging current; by arranging the second current amplifying circuit 12, the weak current signal detected by the battery discharge current detecting circuit 3 can be properly amplified, so that the second current detecting terminal In2 of the controller 6 can detect the weak current signal, and the capability of the controller 6 In detecting the discharge current is improved.
As an example, referring to fig. 6, the first current amplifying circuit 11 includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first operational amplifier A1, a first capacitor C1 and a second capacitor C2; the inverting input end of the first operational amplifier A1 is connected with the current sampling end of the battery charging current detection circuit 2 through the first resistor R1; the non-inverting input end of the first operational amplifier A1 is connected with the ground GND through the second resistor R2; one end of the third resistor R3 is connected between the other end of the second resistor R2 and the non-inverting input end of the first operational amplifier A1, and the other end of the third resistor R3 is connected to the ground GND; the output end of the first operational amplifier A1 is connected to the first current detection end In1 of the controller 6 through the fourth resistor R4; one end of the fifth resistor R5 is connected between the other end of the first resistor R1 and the inverting input terminal of the first operational amplifier A1, and the other end of the fifth resistor R5 is connected between the output terminal of the first operational amplifier A1 and the fourth resistor R4; one end of the first capacitor C1 is connected between the fourth resistor R4 and the first current detection end In1 of the controller 6, and the other end of the first capacitor C1 is connected to the ground GND; one end of the second capacitor C2 is connected to the power supply terminal of the first operational amplifier A1, and the other end of the second capacitor C2 is connected to the ground GND.
In this embodiment, the fifth resistor R5 functions as a negative feedback circuit, the second resistor R2 and the third resistor R3 form a voltage divider circuit, and the first capacitor C1 and the second capacitor C2 function as a filter. Specifically, the amplification factor G of the first current amplifying circuit 11 including the first operational amplifier A1 is: g =1+ R5/R1. Therefore, after the weak current signal detected by the battery charging current detection circuit 2 is amplified by the first operational amplifier A1, the weak current signal is output from the output terminal of the first operational amplifier A1 to the first current detection terminal In1 of the controller 6, so that the weak current signal detected by the battery charging current detection circuit 2 can be more sensitively detected by the controller 6. As an example, the resistance of the first resistor R1 is 100 to 10K ohms, the resistance of the second resistor R2 is 100 to 10K ohms, the resistance of the third resistor R3 is 10K to 100K ohms, the resistance of the fourth resistor R4 is 100 to 1K ohms, the resistance of the fifth resistor R5 is 100 to 1K ohms, the resistance of the first capacitor C1 is 0.1 to 10 nanofarads, and the resistance of the second capacitor C2 is 0.01 to 1 microfarads.
As an example, referring to fig. 7, the second current amplifying circuit 12 includes: a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a second operational amplifier A2 and a third capacitor C3; the inverting input end of the second operational amplifier A2 is connected with the current sampling end of the battery discharge current detection circuit 3 through the sixth resistor R6; the non-inverting input end of the second operational amplifier A2 is connected to the ground GND through the seventh resistor R7; one end of the eighth resistor R8 is connected between the other end of the seventh resistor R7 and the non-inverting input terminal of the second operational amplifier A2, and the other end of the eighth resistor R8 is connected to the ground GND; the output end of the second operational amplifier A2 is connected to the second current detection end In2 of the controller 6 through the ninth resistor R9; one end of the tenth resistor R10 is connected between the other end of the sixth resistor R6 and the inverting input terminal of the second operational amplifier A2, and the other end of the tenth resistor R10 is connected between the output terminal of the second operational amplifier A2 and the ninth resistor R9; one end of the third capacitor C3 is connected between the ninth resistor R9 and the second current detection terminal In2 of the controller 6, and the other end of the third capacitor C3 is connected to the ground GND.
In this embodiment, the tenth resistor R10 functions as a negative feedback circuit, the seventh resistor R7 and the eighth resistor R8 form a voltage divider circuit, and the third capacitor C3 functions as a filter. Specifically, the amplification factor G of the second current amplifying circuit 12 including the second operational amplifier A2 is: g =1+ R10/R6. Therefore, after the weak current signal detected by the battery discharging current detecting circuit 3 is amplified by the second operational amplifier A2, the weak current signal is output from the output terminal of the second operational amplifier A2 to the second current detecting terminal In2 of the controller 6, so that the weak current signal detected by the battery discharging current detecting circuit 3 can be detected by the controller 6 more sensitively. As an example, the resistance of the sixth resistor R6 is 100 to 10K ohms, the resistance of the seventh resistor R7 is 100 to 10K ohms, the resistance of the eighth resistor R8 is 10K to 500K ohms, the resistance of the ninth resistor R9 is 100 to 1K ohms, the resistance of the tenth resistor R10 is 10K to 500K ohms, and the third capacitor C3 is 0.1 to 10 nanofarads.
Referring to fig. 8, another embodiment of the present application further provides an electronic device with a rechargeable battery, which includes a rechargeable battery 1, a charging circuit 4, a discharging circuit 5, a controller 6, and a rechargeable battery charging/discharging current detection circuit as described in any of the above embodiments; the rechargeable battery 1 is connected with the charging circuit 4; the battery charging current detection circuit 2 is connected between the reference ground GND and a ground terminal BGND of the charging circuit, and a current sampling terminal of the battery charging current detection circuit 2 is connected to a first current detection terminal In1 of the controller 6; the rechargeable battery 1 is also connected with the discharge circuit 5; the battery discharge current detection circuit 3 is connected between the ground reference GND and the ground terminal PGND of the discharge circuit, and the current sampling terminal of the battery discharge current detection circuit 3 is connected to the second current detection terminal In2 of the controller 6. As an example, the controller 6 is configured to calculate the capacity of the rechargeable battery 1 according to the currents detected by the first current detection terminal and the second current detection terminal In 2.
The electronic device may be, for example, a charger, or an electronic device with a rechargeable battery 1, such as a mobile phone or a personal computer, and is not limited in particular. It is understood that the charging circuit 4 and the discharging circuit 5 may be conventional circuit structures, and are not limited thereto.
In this embodiment, the controller 6 can accurately detect the charging current of the rechargeable battery 1 through the battery charging current detection circuit 2, so as to accurately detect the charging state of the rechargeable battery 1; the controller 6 can accurately detect the discharge current of the rechargeable battery 1 through the battery discharge current detection circuit 3, so that the discharge state of the rechargeable battery 1 can be accurately detected. Therefore, the embodiment of the present application can improve the accuracy of detecting the charge and discharge state of the rechargeable battery 1.
The above description is only for the specific embodiments of the present application, but the scope of the present application 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 disclosure should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A charging and discharging current detection circuit for a rechargeable battery is characterized by comprising:
the battery charging current detection circuit is connected between a reference ground of the charging battery charging and discharging current detection circuit and a ground end of a charging circuit of the charging battery so as to detect current when the charging battery is charged, and a current sampling end of the battery charging current detection circuit is connected with a first current detection end of the controller; and
and the battery discharge current detection circuit is connected between the reference ground and the ground end of the discharge circuit of the rechargeable battery so as to detect current when the rechargeable battery is discharged, and the current sampling end of the battery discharge current detection circuit is connected with the second current detection end of the controller.
2. The charging/discharging current detection circuit according to claim 1,
the battery charging current detection circuit includes: a charging current detection resistor; one end of the charging current detection resistor is used for being connected with the ground end of the charging circuit, the other end of the charging current detection resistor is connected with the reference ground, and the one end of the charging current detection resistor is also used for being connected with the first current detection end of the controller.
3. The charging/discharging current detection circuit according to claim 1,
the battery discharge current detection circuit includes: a discharge current detection resistor; one end of the discharge current detection resistor is used for being connected with the ground end of the discharge circuit, the other end of the discharge current detection resistor is connected with the reference ground, and the one end of the discharge current detection resistor is also used for being connected with the second current detection end of the controller.
4. The charging/discharging current detection circuit according to claim 1,
the charging and discharging current detection circuit of the rechargeable battery further comprises: a first current limiting circuit and a second current limiting circuit;
the first current limiting circuit is connected between the current sampling end of the battery charging current detection circuit and the first current detection end of the controller;
the second current limiting circuit is connected between the current sampling end of the battery discharge current detection circuit and the second current detection end of the controller.
5. The charging/discharging current detection circuit according to claim 4,
the first current limiting circuit includes: a first current limiting resistor; the first current limiting resistor is connected between the current sampling end of the battery charging current detection circuit and the first current detection end of the controller;
the second current limiting circuit includes: a second current limiting resistor; the second current limiting resistor is connected between the current sampling end of the battery discharge current detection circuit and the second current detection end of the controller.
6. The charging/discharging current detecting circuit for a secondary battery according to claim 1,
the charging and discharging current detection circuit of the rechargeable battery further comprises: a first filter circuit and a second filter circuit;
one end of the first filter circuit is connected between the current sampling end of the battery charging current detection circuit and the first current detection end of the controller, and the other end of the first filter circuit is connected with the reference ground;
one end of the second filter circuit is connected between the current sampling end of the battery discharge current detection circuit and the second current detection end of the controller, and the other end of the second filter circuit is connected with the reference ground.
7. The charging/discharging current detection circuit according to claim 6,
the first filter circuit includes: a first filter capacitor; one end of the first filter capacitor is connected between the current sampling end of the battery charging current detection circuit and the first current detection end of the controller, and the other end of the first filter capacitor is connected with the reference ground;
the second filter circuit includes: a second filter capacitor; one end of the second filter capacitor is connected between the current sampling end of the battery discharge current detection circuit and the second current detection end of the controller, and the other end of the second filter capacitor is connected with the reference ground.
8. The charging/discharging current detection circuit according to claim 1,
the charging and discharging current detection circuit of the rechargeable battery further comprises: a first current amplifying circuit and a second current amplifying circuit;
the first current amplifying circuit is connected between the current sampling end of the battery charging current detection circuit and the first current detection end of the controller;
the second current amplifying circuit is connected between the current sampling end of the battery discharge current detection circuit and the second current detection end of the controller.
9. The charging/discharging current detecting circuit for a secondary battery according to claim 8,
the first current amplifying circuit includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first operational amplifier, a first capacitor and a second capacitor;
the inverting input end of the first operational amplifier is connected with the current sampling end of the battery charging current detection circuit through the first resistor; the non-inverting input end of the first operational amplifier is connected with the reference ground through the second resistor; one end of the third resistor is connected between the other end of the second resistor and the non-inverting input end of the first operational amplifier, and the other end of the third resistor is connected with the reference ground; the output end of the first operational amplifier is connected with the first current detection end of the controller through the fourth resistor; one end of the fifth resistor is connected between the other end of the first resistor and the inverting input end of the first operational amplifier, and the other end of the fifth resistor is connected between the output end of the first operational amplifier and the fourth resistor; one end of the first capacitor is connected between the fourth resistor and the first current detection end of the controller, and the other end of the first capacitor is connected with the reference ground; one end of the second capacitor is connected with a power supply end of the first operational amplifier, and the other end of the second capacitor is connected with the reference ground;
the second current amplifying circuit includes: the circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second operational amplifier and a third capacitor;
the inverting input end of the second operational amplifier is connected with the current sampling end of the battery discharge current detection circuit through the sixth resistor; the non-inverting input end of the second operational amplifier is connected with the reference ground through the seventh resistor; one end of the eighth resistor is connected between the other end of the seventh resistor and the non-inverting input end of the second operational amplifier, and the other end of the eighth resistor is connected with the reference ground; the output end of the second operational amplifier is connected with the second current detection end of the controller through the ninth resistor; one end of the tenth resistor is connected between the other end of the sixth resistor and the inverting input end of the second operational amplifier, and the other end of the tenth resistor is connected between the output end of the second operational amplifier and the ninth resistor; one end of the third capacitor is connected between the ninth resistor and the second current detection end of the controller, and the other end of the third capacitor is connected to the reference ground.
10. An electronic device having a rechargeable battery, comprising a rechargeable battery, a charging circuit, a discharging circuit, a controller, and a rechargeable battery charging/discharging current detection circuit according to any one of claims 1 to 9;
the rechargeable battery is connected with the charging circuit; the battery charging current detection circuit is connected between the reference ground and the ground end of the charging circuit, and the current sampling end of the battery charging current detection circuit is connected with the first current detection end of the controller;
the rechargeable battery is also connected with the discharge circuit; the battery discharge current detection circuit is connected between the reference ground and the ground end of the discharge circuit, and the current sampling end of the battery discharge current detection circuit is connected with the second current detection end of the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221014962.9U CN217981612U (en) | 2022-04-27 | 2022-04-27 | Charging and discharging current detection circuit of rechargeable battery and electronic device with rechargeable battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221014962.9U CN217981612U (en) | 2022-04-27 | 2022-04-27 | Charging and discharging current detection circuit of rechargeable battery and electronic device with rechargeable battery |
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| Publication Number | Publication Date |
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| CN217981612U true CN217981612U (en) | 2022-12-06 |
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|---|---|---|---|
| CN202221014962.9U Active CN217981612U (en) | 2022-04-27 | 2022-04-27 | Charging and discharging current detection circuit of rechargeable battery and electronic device with rechargeable battery |
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| Country | Link |
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| CN (1) | CN217981612U (en) |
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