CN214543738U - Charging circuit of battery - Google Patents
Charging circuit of battery Download PDFInfo
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- CN214543738U CN214543738U CN202120866465.0U CN202120866465U CN214543738U CN 214543738 U CN214543738 U CN 214543738U CN 202120866465 U CN202120866465 U CN 202120866465U CN 214543738 U CN214543738 U CN 214543738U
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Abstract
The embodiment of the utility model discloses charging circuit of battery, this charging circuit includes: the power supply comprises a first power supply input end, a second power supply input end, a first battery connecting end, a second battery connecting end, an MOS (metal oxide semiconductor) tube, a first operational amplifier unit, a second operational amplifier unit, a control module, a voltage stabilizing module, a first voltage dividing module, a second voltage dividing module, a third voltage dividing module, a fourth voltage dividing module and a fifth voltage dividing module; the first pole of the MOS tube is electrically connected with the first power input end, the second pole of the MOS tube is electrically connected with the first battery connecting end, and the grid of the MOS tube is electrically connected with the first end of the control module; the second end of the control module is electrically connected with the second power input end, and the control end of the control module is electrically connected with the output end of the first operational amplifier unit and the output end of the second operational amplifier unit. The embodiment of the utility model provides a charging circuit of battery can prevent that the charging circuit that the power passes through the battery from charging for other loads, improves the reliability that the battery charged.
Description
Technical Field
The embodiment of the utility model provides a relate to battery charging technology, especially relate to a charging circuit of battery.
Background
Batteries are widely used in a variety of fields as an energy storage device. Rechargeable batteries are one of the batteries commonly used in portable electronic devices and electric vehicles, and are increasingly popular in military and aerospace applications. The battery is charged by a charging circuit, which can transmit a power supply voltage to the battery, and the reliability of the charging circuit needs to be ensured to reliably charge the battery.
At present, in the existing charging circuit of the battery, when the battery is off-line, the battery port can also carry current below the charging current of the battery, when the output port of the charging circuit is mistakenly connected to other loads such as a controller, the controller can work normally, but when the controller needs to operate a field mechanism, high power cannot be provided at all, and the reliability of battery charging is influenced.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a charging circuit of battery to prevent that the charging circuit of power through the battery from charging for other loads, improving the reliability that the battery charged.
An embodiment of the utility model provides a charging circuit of battery, include: the power supply comprises a first power supply input end, a second power supply input end, a first battery connecting end, a second battery connecting end, an MOS (metal oxide semiconductor) tube, a first operational amplifier unit, a second operational amplifier unit, a control module, a voltage stabilizing module, a first voltage dividing module, a second voltage dividing module, a third voltage dividing module, a fourth voltage dividing module and a fifth voltage dividing module;
the first pole of the MOS tube is electrically connected with the first power input end, the second pole of the MOS tube is electrically connected with the first battery connecting end, and the grid of the MOS tube is electrically connected with the first end of the control module; the second end of the control module is electrically connected with the second power supply input end, and the control end of the control module is electrically connected with the output end of the first operational amplifier unit and the output end of the second operational amplifier unit;
the first end of the first voltage division module is electrically connected with the first battery connecting end, the second end of the first voltage division module is electrically connected with the first end of the second voltage division module, the second end of the second voltage division module is electrically connected with the second battery connecting end and the first input end of the first operational amplifier unit, the second input end of the first operational amplifier unit is electrically connected with the output end of the voltage stabilizing module, the first input end of the voltage stabilizing module is electrically connected with the first power supply input end, and the second input end of the voltage stabilizing module is electrically connected with the second power supply input end;
the first end of the third voltage division module is electrically connected with the output end of the voltage stabilization module, the second end of the third voltage division module is electrically connected with the first end of the fourth voltage division module and is also electrically connected with the first input end of the second operational amplifier unit, the second input end of the second operational amplifier unit is electrically connected with the second battery connecting end and is also electrically connected with the first end of the fifth voltage division module, and the second end of the fifth voltage division module is electrically connected with the second end of the control module;
the first operational amplifier unit is used for outputting a high level when the voltage difference between the first battery connecting end and the second battery connecting end exceeds a preset value and outputting a low level when the voltage difference is lower than the preset value; the second operational amplifier unit is used for outputting a high level when the voltage difference between a first input end and a second input end of the second operational amplifier unit is greater than a preset voltage, and is also used for outputting a low level when the voltage difference between the first input end and the second input end of the second operational amplifier unit is less than the preset voltage; the control module is used for controlling the conduction of the MOS tube when the first operational amplifier unit and the second operational amplifier unit output high levels, and is also used for controlling the turn-off of the MOS tube when the first operational amplifier unit outputs low levels and/or the second operational amplifier unit outputs low levels.
Optionally, the first voltage division module includes a first resistor, a first end of the first resistor is used as a first end of the first voltage division module, and a second end of the first resistor is used as a second end of the first voltage division module;
the second voltage division module comprises a second resistor, wherein the first end of the second resistor is used as the first end of the second voltage division module, and the second end of the second resistor is used as the second end of the second voltage division module;
the third voltage division module comprises a third resistor, wherein the first end of the third resistor is used as the first end of the third voltage division module, and the second end of the third resistor is used as the second end of the third voltage division module;
the fourth voltage division module comprises a fourth resistor, wherein the first end of the fourth resistor is used as the first end of the fourth voltage division module, and the second end of the fourth resistor is used as the second end of the fourth voltage division module;
the fifth voltage division module comprises a fifth resistor, the first end of the fifth resistor is used as the first end of the fifth voltage division module, and the second end of the fifth resistor is used as the second end of the fifth voltage division module.
Optionally, the first operational amplifier unit includes a first operational amplifier, a first triode, a sixth resistor and a seventh resistor; the negative input end of the first operational amplifier is used as the first input end of the first operational amplifier unit, the positive input end of the first operational amplifier is used as the second input end of the first operational amplifier unit, the output end of the first operational amplifier is electrically connected with the base electrode of the first triode through a sixth resistor, the first pole of the first triode is used as the output end of the first operational amplifier unit, and the second pole and the base electrode of the first triode are electrically connected through a seventh resistor.
Optionally, the first triode is an NPN-type triode.
Optionally, the second operational amplifier unit includes a second operational amplifier, an eighth resistor, and a ninth resistor; the positive input end of the second operational amplifier is used as the first input end of the second operational amplifier unit, the negative input end of the second operational amplifier is electrically connected with the first end of the eighth resistor, the second end of the eighth resistor is used as the second input end of the second operational amplifier unit, the first end of the ninth resistor is electrically connected with the output end of the second operational amplifier, and the second end of the ninth resistor is used as the output end of the second operational amplifier unit.
Optionally, the control module includes a second triode and a tenth resistor, a base of the second triode is used as a control end of the control module, a first end of the tenth resistor is used as a first end of the control module, a second end of the tenth resistor is electrically connected to a first electrode of the second triode, and a second electrode of the second triode is used as a second end of the control module.
Optionally, the second triode is an NPN-type triode.
Optionally, the voltage stabilizing module includes a voltage stabilizing source and an eleventh resistor, a first end of the eleventh resistor serves as a first input end of the voltage stabilizing module, an input end of the voltage stabilizing source serves as a second input end of the voltage stabilizing module, a second end of the eleventh resistor is electrically connected with an output end of the voltage stabilizing source, a regulating end of the voltage stabilizing source is electrically connected with an output end of the voltage stabilizing source, and an output end of the voltage stabilizing source serves as an output end of the voltage stabilizing module.
Optionally, the charging circuit further includes a twelfth resistor and a thirteenth resistor; the control end of the control module is electrically connected with the second end of the control module through a twelfth resistor, and the grid electrode of the MOS tube is electrically connected with the first electrode of the MOS tube through a thirteenth resistor.
Optionally, the MOS transistor is a PMOS transistor.
The embodiment of the utility model provides a charging circuit of battery, including first power input end, second power input end, first battery link end, second battery link end, MOS pipe, first fortune is put the unit, the second fortune is put the unit, control module, voltage stabilizing module, first voltage dividing module, second voltage dividing module, third voltage dividing module, fourth voltage dividing module and fifth voltage dividing module; the first pole of the MOS tube is electrically connected with the first power input end, the second pole of the MOS tube is electrically connected with the first battery connecting end, and the grid of the MOS tube is electrically connected with the first end of the control module; the second end of the control module is electrically connected with the second power supply input end, and the control end of the control module is electrically connected with the output end of the first operational amplifier unit and the output end of the second operational amplifier unit; the first end of the first voltage division module is electrically connected with the first battery connecting end, the second end of the first voltage division module is electrically connected with the first end of the second voltage division module, the second end of the second voltage division module is electrically connected with the second battery connecting end and the first input end of the first operational amplifier unit, the second input end of the first operational amplifier unit is electrically connected with the output end of the voltage stabilizing module, the first input end of the voltage stabilizing module is electrically connected with the first power supply input end, and the second input end of the voltage stabilizing module is electrically connected with the second power supply input end; the first end of the third voltage division module is electrically connected with the output end of the voltage stabilization module, the second end of the third voltage division module is electrically connected with the first end of the fourth voltage division module and is also electrically connected with the first input end of the second operational amplifier unit, the second input end of the second operational amplifier unit is electrically connected with the second battery connecting end and is also electrically connected with the first end of the fifth voltage division module, and the second end of the fifth voltage division module is electrically connected with the second end of the control module; the first operational amplifier unit is used for outputting a high level when the voltage difference between the first battery connecting end and the second battery connecting end exceeds a preset value and outputting a low level when the voltage difference is lower than the preset value; the second operational amplifier unit is used for outputting a high level when the voltage difference between a first input end and a second input end of the second operational amplifier unit is greater than a preset voltage, and is also used for outputting a low level when the voltage difference between the first input end and the second input end of the second operational amplifier unit is less than the preset voltage; the control module is used for controlling the conduction of the MOS tube when the first operational amplifier unit and the second operational amplifier unit output high levels, and is also used for controlling the turn-off of the MOS tube when the first operational amplifier unit outputs low levels and/or the second operational amplifier unit outputs low levels. In the charging circuit for the battery provided by the embodiment of the utility model, when the first operational amplifier unit and the second operational amplifier unit both output high levels, the control module controls the conduction of the MOS tube, so that the battery can be charged through the charging circuit; when other loads are connected to the first battery connecting end and the second battery connecting end of the charging circuit, the first battery connecting end and the second battery connecting end have no voltage difference or the voltage difference is lower than a preset value, the first operational amplifier unit outputs a low level, the control module controls the MOS tube to be switched off at the moment, a power supply can be prevented from charging other loads through the charging circuit of the battery, and the charging reliability of the battery is improved.
Drawings
Fig. 1 is a schematic circuit structure diagram of a charging circuit for a battery according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a charging circuit of another battery according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a charging circuit for a battery according to another embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a charging circuit for a battery according to another embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a charging circuit for a battery according to another embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a charging circuit for a battery according to another embodiment of the present invention;
fig. 7 is a schematic circuit diagram of a charging circuit for a battery according to another embodiment of the present invention;
fig. 8 is a schematic circuit diagram of a charging circuit for a battery according to another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic circuit structure diagram of a charging circuit of a battery provided in an embodiment of the present invention, referring to fig. 1, the charging circuit of the battery includes: the power supply comprises a first power supply input end V +, a second power supply input end V-, a first battery connection end B +, a second battery connection end B-, an MOS (metal oxide semiconductor) tube Q, a first operational amplifier unit 10, a second operational amplifier unit 20, a control module 30, a voltage stabilizing module 40, a first voltage dividing module 50, a second voltage dividing module 60, a third voltage dividing module 70, a fourth voltage dividing module 80 and a fifth voltage dividing module 90.
A first pole of the MOS transistor Q is electrically connected to the first power input terminal V +, a second pole of the MOS transistor Q is electrically connected to the first battery connection terminal B +, and a gate of the MOS transistor Q is electrically connected to the first end of the control module 30; the second end of the control module 30 is electrically connected with a second power input end V-, the control end of the control module 30 is electrically connected with the output end of the first operational amplifier unit 10, and the control end of the control module 30 is also electrically connected with the output end of the second operational amplifier unit 20; the first end of the first voltage division module 50 is electrically connected with a first battery connection end B +, the second end of the first voltage division module 50 is electrically connected with the first end of the second voltage division module 60, the second end of the second voltage division module 60 is electrically connected with a second battery connection end B-, the second end of the second voltage division module 60 is also electrically connected with the first input end of the first operational amplifier unit 10, the second input end of the first operational amplifier unit 10 is electrically connected with the output end of the voltage stabilizing module 40, the first input end of the voltage stabilizing module 40 is electrically connected with a first power supply input end V +, and the second input end of the voltage stabilizing module 40 is electrically connected with a second power supply input end V-; the first end of the third voltage division module 70 is electrically connected with the output end of the voltage stabilization module 40, the second end of the third voltage division module 70 is electrically connected with the first end of the fourth voltage division module 80, the second end of the third voltage division module 70 is also electrically connected with the first input end of the second operational amplifier unit 20, the second input end of the second operational amplifier unit 20 is electrically connected with the second battery connection end B-, the second input end of the second operational amplifier unit 20 is also electrically connected with the first end of the fifth voltage division module 90, and the second end of the fifth voltage division module 90 is electrically connected with the second end of the control module 30; the first operational amplifier unit 10 is configured to output a high level when a voltage difference between the first battery connection terminal V + and the second battery connection terminal V-exceeds a preset value, and is further configured to output a low level when the voltage difference is lower than the preset value; the second operational amplifier unit 20 is configured to output a high level when a voltage difference between a first input terminal and a second input terminal of the second operational amplifier unit 20 is greater than a preset voltage, and is further configured to output a low level when the voltage difference between the first input terminal and the second input terminal of the second operational amplifier unit 20 is less than the preset voltage; the control module 30 is configured to control the MOS transistor Q to be turned on when both the first operational amplifier unit 10 and the second operational amplifier unit 20 output a high level, and is further configured to control the MOS transistor Q to be turned off when the first operational amplifier unit 10 outputs a low level and/or the second operational amplifier unit 20 outputs a low level.
Specifically, the MOS transistor Q may be a PMOS transistor, and the power voltage is input to the charging circuit through the first power input terminal V + and the second power input terminal V-of the charging circuit. When the battery needs to be charged, a charging port of the battery is connected to a first battery connection end B + and a second battery connection end B-of the charging circuit, and at this time, the first battery connection end B + and the second battery connection end B-have a voltage difference and the voltage difference exceeds a preset value, such as 10V, then the first operational amplifier unit 10 outputs a high level, the voltage stabilizing module 40 provides a stable voltage for the second operational amplifier unit 20, the voltage is divided by the third voltage dividing module 70 and the fourth voltage dividing module 80 to provide a constant voltage for a first input end of the second operational amplifier unit 20, at this time, the second operational amplifier unit 20 outputs a high level, and the control module 30 controls the MOS transistor Q to be turned on, so that the battery is charged by the charging circuit; the voltage of the fifth voltage division module 90 is positively correlated with the charging current, the voltage of the fifth voltage division module 90 is applied to the second input terminal of the second operational amplifier unit 20, when the voltage of the fifth voltage division module 90 is greater than the constant voltage of the second operational amplifier unit 20, the voltage difference between the first input terminal and the second input terminal of the second operational amplifier unit 20 is smaller than the preset voltage, the second operational amplifier unit 20 outputs a low level, the control module 30 controls the MOS transistor Q to turn off, the charging current gradually decreases, when the voltage of the fifth voltage division module 90 is decreased to be smaller than the constant voltage of the first input terminal of the second operational amplifier unit 20, the voltage difference between the first input terminal and the second input terminal of the second operational amplifier unit 20 is greater than the preset voltage, the second operational amplifier unit 20 outputs a high level, the control module 30 controls the MOS transistor Q to turn on, and the charging current tends to a constant value after repeating the above processes, so as to realize charging, the corresponding second operational amplifier unit 20 outputs a high level, and after the battery is connected to the charging circuit, the first operational amplifier unit 10 always outputs a high level, and then the control module 30 controls the conduction of the MOS transistor Q, so that the power voltage is transmitted to the battery through the conducted MOS transistor Q, and the purpose of linearly charging the battery is achieved. When the first battery connection terminal B + and the second battery connection terminal B-are connected to other loads, such as a controller, instead of the battery, there is no voltage difference between the first battery connection terminal B + and the second battery connection terminal B-, the first operational amplifier unit 10 outputs a low level, and the control module 30 controls the MOS transistor Q to turn off, so that the power supply can be prevented from charging other loads through the battery charging circuit.
The charging circuit for the battery provided by this embodiment includes a first power input terminal, a second power input terminal, a first battery connection terminal, a second battery connection terminal, an MOS transistor, a first operational amplifier unit, a second operational amplifier unit, a control module, a voltage regulator module, a first voltage divider module, a second voltage divider module, a third voltage divider module, a fourth voltage divider module, and a fifth voltage divider module; the first pole of the MOS tube is electrically connected with the first power input end, the second pole of the MOS tube is electrically connected with the first battery connecting end, and the grid of the MOS tube is electrically connected with the first end of the control module; the second end of the control module is electrically connected with the second power supply input end, and the control end of the control module is electrically connected with the output end of the first operational amplifier unit and the output end of the second operational amplifier unit; the first end of the first voltage division module is electrically connected with the first battery connecting end, the second end of the first voltage division module is electrically connected with the first end of the second voltage division module, the second end of the second voltage division module is electrically connected with the second battery connecting end and the first input end of the first operational amplifier unit, the second input end of the first operational amplifier unit is electrically connected with the output end of the voltage stabilizing module, the first input end of the voltage stabilizing module is electrically connected with the first power supply input end, and the second input end of the voltage stabilizing module is electrically connected with the second power supply input end; the first end of the third voltage division module is electrically connected with the output end of the voltage stabilization module, the second end of the third voltage division module is electrically connected with the first end of the fourth voltage division module and is also electrically connected with the first input end of the second operational amplifier unit, the second input end of the second operational amplifier unit is electrically connected with the second battery connecting end and is also electrically connected with the first end of the fifth voltage division module, and the second end of the fifth voltage division module is electrically connected with the second end of the control module; the first operational amplifier unit is used for outputting a high level when the voltage difference between the first battery connecting end and the second battery connecting end exceeds a preset value and outputting a low level when the voltage difference is lower than the preset value; the second operational amplifier unit is used for outputting a high level when the voltage difference between a first input end and a second input end of the second operational amplifier unit is greater than a preset voltage, and is also used for outputting a low level when the voltage difference between the first input end and the second input end of the second operational amplifier unit is less than the preset voltage; the control module is used for controlling the conduction of the MOS tube when the first operational amplifier unit and the second operational amplifier unit output high levels, and is also used for controlling the turn-off of the MOS tube when the first operational amplifier unit outputs low levels and/or the second operational amplifier unit outputs low levels. In the charging circuit for the battery provided by the embodiment, when the first operational amplifier unit and the second operational amplifier unit both output high levels, the control module controls the conduction of the MOS transistor, so that the battery can be charged through the charging circuit; when other loads are connected to the first battery connecting end and the second battery connecting end of the charging circuit, the first battery connecting end and the second battery connecting end have no voltage difference or the voltage difference is lower than a preset value, the first operational amplifier unit outputs a low level, the control module controls the MOS tube to be switched off at the moment, a power supply can be prevented from charging other loads through the charging circuit of the battery, and the charging reliability of the battery is improved.
Fig. 2 is a schematic circuit structure diagram of another charging circuit for a battery according to an embodiment of the present invention, referring to fig. 2, optionally, the first voltage dividing module 50 includes a first resistor R1, a first end of the first resistor R1 is used as a first end of the first voltage dividing module 50, and a second end of the first resistor R1 is used as a second end of the first voltage dividing module 50; the second voltage division module 60 comprises a second resistor R2, a first end of the second resistor R2 is used as a first end of the second voltage division module 60, and a second end of the second resistor R2 is used as a second end of the second voltage division module 60; the third voltage dividing module 70 includes a third resistor R3, a first end of the third resistor R3 is a first end of the third voltage dividing module 70, and a second end of the third resistor R3 is a second end of the third voltage dividing module 70; the fourth voltage division module 80 comprises a fourth resistor R4, a first end of the fourth resistor R4 serves as a first end of the fourth voltage division module 80, and a second end of the fourth resistor R4 serves as a second end of the fourth voltage division module 80; the fifth voltage division module 90 includes a fifth resistor R5, a first terminal of the fifth resistor R5 is a first terminal of the fifth voltage division module 90, and a second terminal of the fifth resistor R5 is a second terminal of the fifth voltage division module 90.
Illustratively, the first and second resistors R1 and R2 divide the voltage difference between the first and second battery terminals B + and B-, when the battery is connected to the first and second battery terminals B + and B-of the charging circuit. The voltage stabilizing module 40 provides a reference voltage, such as a reference voltage of 2.5V, to the first input terminal of the second operational amplifier unit 20, and the reference voltage is obtained by dividing the voltage output by the voltage stabilizing module 40 through the third resistor R3 and the fourth resistor R4. The voltage of the fifth resistor R5 is the product of the charging current and the resistance thereof, the charging current is supplied to the second input terminal of the second operational amplifier unit 20 through the voltage generated by the fifth resistor R5, and a stable charging current is finally obtained according to the analysis of the charging current.
It should be noted that the resistance value of each resistor may be specifically set according to an actual specific circuit structure, the voltage output by the voltage stabilizing module, an actual voltage requirement of each operational amplifier unit, a preset value corresponding to the voltage difference between the first battery connection terminal V + and the second battery connection terminal V —, and the like, which is not limited herein.
Fig. 3 is a schematic circuit structure diagram of a charging circuit for a battery according to another embodiment of the present invention, referring to fig. 3, optionally, the first operational amplifier unit 10 includes a first operational amplifier a1, a first transistor Q1, a sixth resistor R6, and a seventh resistor R7; the negative input end of the first operational amplifier a1 is used as the first input end of the first operational amplifier unit 10, the positive input end of the first operational amplifier a1 is used as the second input end of the first operational amplifier unit 10, the output end of the first operational amplifier a1 is electrically connected to the base of the first triode Q1 through the sixth resistor R6, the first pole of the first triode Q1 is used as the output end of the first operational amplifier unit 10, and the second pole and the base of the first triode Q1 are electrically connected through the seventh resistor R7.
The first transistor Q1 may be an NPN transistor, and when the output end of the first operational amplifier a1 outputs a low level, the first transistor Q1 is turned off, and the first operational amplifier unit 10 outputs a high level; when the output end of the first operational amplifier a1 outputs a high level, the first transistor Q1 is turned on, the first operational amplifier unit 10 outputs a low level, and the control module 30 controls the MOS transistor Q to be turned off.
Fig. 4 is a schematic circuit structure diagram of a charging circuit for a battery according to another embodiment of the present invention, referring to fig. 4, optionally, the second operational amplifier unit 20 includes a second operational amplifier a2, an eighth resistor R8, and a ninth resistor R9; a positive input terminal of the second operational amplifier a2 is used as a first input terminal of the second operational amplifier unit 20, a negative input terminal of the second operational amplifier a2 is electrically connected to a first terminal of the eighth resistor R8, a second terminal of the eighth resistor R8 is used as a second input terminal of the second operational amplifier unit 20, a first terminal of the ninth resistor R9 is electrically connected to an output terminal of the second operational amplifier a2, and a second terminal of the ninth resistor R9 is used as an output terminal of the second operational amplifier unit 20.
Specifically, the voltage at the positive input terminal of the second operational amplifier a2 is obtained by dividing the voltage output by the regulated power supply 40 through the third voltage dividing module 70 and the fourth voltage dividing module 80. When the voltage of the fifth voltage dividing module 90 is greater than the voltage of the positive input end of the second operational amplifier a2, and the voltage difference between the positive input end and the negative input end of the second operational amplifier a2 is smaller than the preset voltage, the second operational amplifier a2 outputs a low level, the control module 30 controls the MOS transistor Q to turn off, the charging current gradually decreases, and when the voltage of the fifth voltage dividing module 90 is reduced to be smaller than the voltage of the positive input end of the second operational amplifier a2, the voltage difference between the positive input end and the negative input end of the second operational amplifier a2 is greater than the preset voltage, the second operational amplifier a2 outputs a high level, and the charging current finally approaches a constant value by repeating the above processes, so that the constant current charging is realized.
Fig. 5 is a schematic circuit structure diagram of a charging circuit for a battery according to an embodiment of the present invention, referring to fig. 5, optionally, the control module 30 includes a second transistor Q2 and a tenth resistor R10, the base of the second transistor Q2 is used as the control end of the control module, the first end of the tenth resistor R10 is used as the first end of the control module, the second end of the tenth resistor R10 is electrically connected to the first pole of the second transistor Q2, and the second pole of the second transistor Q2 is used as the second end of the control module 30.
The second transistor Q2 may be an NPN transistor. When the first operational amplifier unit 10 and the second operational amplifier unit 20 both output a high level, the second transistor Q2 is turned on, and if the MOS transistor Q is a PMOS transistor, the MOS transistor Q is turned on at this time, so that the battery is charged through the turned-on MOS transistor Q. When the first operational amplifier unit 10 outputs a low level and/or the second operational amplifier unit 20 outputs a low level, the second transistor Q2 is turned off, and if the MOS transistor Q is a PMOS transistor, the MOS transistor Q is turned off, so as to cut off the on state of the charging circuit.
Fig. 6 is a schematic circuit structure diagram of a charging circuit for a battery according to an embodiment of the present invention, referring to fig. 6, optionally, the voltage regulator module 40 includes a voltage regulator A3 and an eleventh resistor R11, a first end of the eleventh resistor R11 serves as a first input end of the voltage regulator module 40, an input end 1 of the voltage regulator A3 serves as a second input end of the voltage regulator module 40, a second end of the eleventh resistor R11 is electrically connected to an output end of the voltage regulator A3, an adjustment end 2 of the voltage regulator A3 is electrically connected to an output end 3 of the voltage regulator A3, and an output end of the voltage regulator A3 serves as an output end of the voltage regulator module 40. The voltage regulator A3 provides a reference voltage for the second op-amp unit 20, and the voltage regulator A3 may be a TL431 voltage regulator. The TL431 is a controllable precision voltage regulator, and is widely used in various power circuits due to its good performance and low price.
Fig. 7 is a schematic circuit structure diagram of a charging circuit for a battery according to another embodiment of the present invention, referring to fig. 7, optionally, the charging circuit further includes a twelfth resistor R12 and a thirteenth resistor R13; the control terminal of the control module 30 is electrically connected to the second terminal of the control module 30 through a twelfth resistor R12, and the gate of the MOS transistor Q is electrically connected to the first pole of the MOS transistor Q through a thirteenth resistor R13. In an implementation manner, fig. 8 is a schematic circuit structure diagram of a charging circuit of another battery according to an embodiment of the present invention, fig. 8 illustrates specific circuit devices of each module unit, and the specific working process of the specific circuit structure illustrated in fig. 8 may refer to the description of fig. 1 to fig. 7, which is not repeated herein.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A charging circuit for a battery, comprising: the power supply comprises a first power supply input end, a second power supply input end, a first battery connecting end, a second battery connecting end, an MOS (metal oxide semiconductor) tube, a first operational amplifier unit, a second operational amplifier unit, a control module, a voltage stabilizing module, a first voltage dividing module, a second voltage dividing module, a third voltage dividing module, a fourth voltage dividing module and a fifth voltage dividing module;
a first pole of the MOS tube is electrically connected with the first power input end, a second pole of the MOS tube is electrically connected with the first battery connecting end, and a grid electrode of the MOS tube is electrically connected with the first end of the control module; the second end of the control module is electrically connected with the second power supply input end, and the control end of the control module is electrically connected with the output end of the first operational amplifier unit and the output end of the second operational amplifier unit;
the first end of the first voltage division module is electrically connected with the first battery connecting end, the second end of the first voltage division module is electrically connected with the first end of the second voltage division module, the second end of the second voltage division module is electrically connected with the second battery connecting end and is also electrically connected with the first input end of the first operational amplifier unit, the second input end of the first operational amplifier unit is electrically connected with the output end of the voltage stabilizing module, the first input end of the voltage stabilizing module is electrically connected with the first power supply input end, and the second input end of the voltage stabilizing module is electrically connected with the second power supply input end;
the first end of the third voltage division module is electrically connected with the output end of the voltage stabilization module, the second end of the third voltage division module is electrically connected with the first end of the fourth voltage division module and is also electrically connected with the first input end of the second operational amplifier unit, the second input end of the second operational amplifier unit is electrically connected with the second battery connecting end and is also electrically connected with the first end of the fifth voltage division module, and the second end of the fifth voltage division module is electrically connected with the second end of the control module;
the first operational amplifier unit is used for outputting a high level when the voltage difference between the first battery connecting end and the second battery connecting end exceeds a preset value, and is also used for outputting a low level when the voltage difference is lower than the preset value; the second operational amplifier unit is used for outputting a high level when the voltage difference between a first input end and a second input end of the second operational amplifier unit is greater than a preset voltage, and is also used for outputting a low level when the voltage difference between the first input end and the second input end of the second operational amplifier unit is less than the preset voltage; the control module is used for controlling the MOS tube to be conducted when the first operational amplifier unit and the second operational amplifier unit both output high levels, and is also used for controlling the MOS tube to be switched off when the first operational amplifier unit outputs low levels and/or the second operational amplifier unit outputs low levels.
2. The battery charging circuit according to claim 1, wherein the first voltage dividing module comprises a first resistor, a first terminal of the first resistor is a first terminal of the first voltage dividing module, and a second terminal of the first resistor is a second terminal of the first voltage dividing module;
the second voltage division module comprises a second resistor, a first end of the second resistor is used as a first end of the second voltage division module, and a second end of the second resistor is used as a second end of the second voltage division module;
the third voltage division module comprises a third resistor, wherein a first end of the third resistor is used as a first end of the third voltage division module, and a second end of the third resistor is used as a second end of the third voltage division module;
the fourth voltage division module comprises a fourth resistor, a first end of the fourth resistor is used as a first end of the fourth voltage division module, and a second end of the fourth resistor is used as a second end of the fourth voltage division module;
the fifth voltage division module comprises a fifth resistor, a first end of the fifth resistor serves as a first end of the fifth voltage division module, and a second end of the fifth resistor serves as a second end of the fifth voltage division module.
3. The battery charging circuit of claim 1, wherein the first operational amplifier unit comprises a first operational amplifier, a first transistor, a sixth resistor, and a seventh resistor; the negative input end of the first operational amplifier is used as the first input end of the first operational amplifier unit, the positive input end of the first operational amplifier is used as the second input end of the first operational amplifier unit, the output end of the first operational amplifier is electrically connected with the base electrode of the first triode through the sixth resistor, the first pole of the first triode is used as the output end of the first operational amplifier unit, and the second pole and the base electrode of the first triode are electrically connected through the seventh resistor.
4. The battery charging circuit of claim 3, wherein the first transistor is an NPN transistor.
5. The battery charging circuit of claim 1, wherein the second operational amplifier unit comprises a second operational amplifier, an eighth resistor and a ninth resistor; the positive input end of the second operational amplifier is used as the first input end of the second operational amplifier unit, the negative input end of the second operational amplifier is electrically connected with the first end of the eighth resistor, the second end of the eighth resistor is used as the second input end of the second operational amplifier unit, the first end of the ninth resistor is electrically connected with the output end of the second operational amplifier, and the second end of the ninth resistor is used as the output end of the second operational amplifier unit.
6. The battery charging circuit of claim 1, wherein the control module comprises a second transistor and a tenth resistor, a base of the second transistor serves as a control terminal of the control module, a first terminal of the tenth resistor serves as a first terminal of the control module, a second terminal of the tenth resistor is electrically connected to a first terminal of the second transistor, and a second terminal of the second transistor serves as a second terminal of the control module.
7. The battery charging circuit of claim 6, wherein the second transistor is an NPN transistor.
8. The battery charging circuit according to claim 1, wherein the regulator module comprises a regulator and an eleventh resistor, a first terminal of the eleventh resistor serves as a first input terminal of the regulator module, an input terminal of the regulator serves as a second input terminal of the regulator module, a second terminal of the eleventh resistor is electrically connected to an output terminal of the regulator, a regulating terminal of the regulator is electrically connected to an output terminal of the regulator, and an output terminal of the regulator serves as an output terminal of the regulator module.
9. The battery charging circuit of claim 1, further comprising a twelfth resistor and a thirteenth resistor; the control end of the control module is electrically connected with the second end of the control module through the twelfth resistor, and the grid electrode of the MOS tube is electrically connected with the first electrode of the MOS tube through the thirteenth resistor.
10. The battery charging circuit of claim 1, wherein the MOS transistor is a PMOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120866465.0U CN214543738U (en) | 2021-04-25 | 2021-04-25 | Charging circuit of battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120866465.0U CN214543738U (en) | 2021-04-25 | 2021-04-25 | Charging circuit of battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214543738U true CN214543738U (en) | 2021-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120866465.0U Active CN214543738U (en) | 2021-04-25 | 2021-04-25 | Charging circuit of battery |
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| Country | Link |
|---|---|
| CN (1) | CN214543738U (en) |
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2021
- 2021-04-25 CN CN202120866465.0U patent/CN214543738U/en active Active
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