CN219067899U - Battery charge-discharge control circuit and electronic equipment - Google Patents
Battery charge-discharge control circuit and electronic equipment Download PDFInfo
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- CN219067899U CN219067899U CN202223394357.1U CN202223394357U CN219067899U CN 219067899 U CN219067899 U CN 219067899U CN 202223394357 U CN202223394357 U CN 202223394357U CN 219067899 U CN219067899 U CN 219067899U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model relates to a battery charge and discharge control circuit and an electronic device, comprising: the device comprises a battery, a first change-over switch, a second change-over switch, a charging loop and a discharging loop; the first switch is respectively connected with the first end of the battery, the first end of the charging loop and the first end of the discharging loop; the second change-over switch is respectively connected with the second end of the battery, the second end of the charging loop and the second end of the discharging loop; the charging circuit comprises a power input end, a charging switch unit and a charging voltage detection unit; the first end of the charging switch unit is connected with the first switch, the second end of the charging switch unit is connected with the second end of the charging voltage detection unit, the first end of the charging voltage detection unit is connected with the power input end and the second switch, and the third end of the charging voltage detection unit is connected with the third end of the charging switch unit. The utility model can realize the control process of battery charge and discharge with low cost.
Description
Technical Field
The present utility model relates to the field of battery charging and discharging technologies, and in particular, to a battery charging and discharging control circuit and an electronic device.
Background
More and more electronic devices are currently being powered by rechargeable batteries so that they can be used in different scenarios. However, for the charge and discharge process of the electronic device, it is often necessary to implement detection of the charge and discharge state and switching of the charge and discharge process by using various control chips and peripheral circuits thereof, and the whole control process needs to use a relatively complex control circuit and needs to use a software processing process, so that the circuit cost is greatly increased.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a battery charge and discharge control circuit and electronic equipment.
The technical scheme adopted for solving the technical problems is as follows: a battery charge-discharge control circuit is constructed, comprising: the device comprises a battery, a first change-over switch, a second change-over switch, a charging loop and a discharging loop;
the first switch is respectively connected with the first end of the battery, the first end of the charging loop and the first end of the discharging loop and is used for switching the first end of the battery to be conducted with the first end of the charging loop or the first end of the discharging loop;
the second change-over switch is respectively connected with the second end of the battery, the second end of the charging loop and the second end of the discharging loop and is used for switching the second end of the battery to be conducted with the second end of the charging loop or the second end of the discharging loop;
the charging circuit comprises a power input end, a charging switch unit and a charging voltage detection unit;
the first end of the charging switch unit is connected with the first change-over switch, the second end of the charging switch unit is connected with the second end of the charging voltage detection unit, the first end of the charging voltage detection unit is connected with the power input end and the second change-over switch, and the third end of the charging voltage detection unit is connected with the third end of the charging switch unit.
Preferably, in the battery charge-discharge control circuit of the present utility model, the charge voltage detection unit includes a first comparison unit, a first voltage division unit, and a second voltage division unit;
the first end of the first voltage division unit is connected with the power input end, the second end of the first voltage division unit is connected with the first end of the first comparison unit, the second end of the first comparison unit is connected with the second end of the charging switch unit, the third end of the first comparison unit is connected with the first end of the second voltage division unit, the second end of the second voltage division unit is connected with the third end of the charging switch unit, and the third end of the first voltage division unit and the third end of the second voltage division unit are grounded.
Preferably, in the battery charge-discharge control circuit of the present utility model, the first comparing unit includes a first operational amplifier, a first capacitor, and a first resistor; the non-inverting input end of the first operational amplifier is connected with the second end of the first voltage dividing unit, the inverting input end of the first operational amplifier is connected with the first end of the first resistor and the first end of the first capacitor, the second end of the first resistor is connected with the second end of the charging switch unit, the second end of the first capacitor is grounded, and the output end of the first operational amplifier is connected with the first end of the second voltage dividing unit; and/or
The first voltage dividing unit comprises a second resistor, a third resistor and a second capacitor; the first end of the second resistor is connected with the power input end, the second end of the second resistor is connected with the first end of the third resistor, the first end of the second capacitor and the first end of the first comparison unit, and the second end of the third resistor and the second end of the second capacitor are grounded; and/or
The second voltage division unit comprises a fourth resistor and a fifth resistor, a first end of the fourth resistor is connected with a third end of the first comparison unit, a second end of the fourth resistor is connected with the third end of the charging switch unit and the first end of the fifth resistor, and a second end of the fifth resistor is grounded.
Preferably, in the battery charge-discharge control circuit of the present utility model, the charging circuit further includes a charging current adjusting unit;
the second end of the charging switch unit is connected with the first end of the charging current adjusting unit, and the second end of the charging current adjusting unit is grounded.
In the battery charge/discharge control circuit of the present utility model, preferably, the charge switch unit includes a first switch tube, a first end of the first switch tube is connected to the first switch, a second end of the first switch tube is connected to the second end of the charge voltage detection unit and the first end of the charge current adjustment unit, and a third end of the first switch tube is connected to the third end of the first comparison unit.
Preferably, in the battery charge and discharge control circuit of the present utility model, the charging circuit further includes a reverse isolation unit, a first end of the reverse isolation unit is connected to the first switch, and a second end of the reverse isolation unit is connected to the first end of the charging switch unit.
Preferably, in the battery charge-discharge control circuit of the present utility model, the second changeover switch includes a relay switch and a first diode; the first end of the coil of the relay switch and the cathode of the first diode are connected with the power input end, the second end of the coil of the relay switch and the anode of the first diode are grounded, the fixed contact of the relay switch is connected with the second end of the battery, the normally closed contact of the relay switch is connected with the second end of the charging loop, and the normally open contact of the relay switch is connected with the power input end; and/or
The first switch comprises a micro switch, the public end of the micro switch is connected with the first end of the battery, the normally closed contact of the micro switch is connected with the first end of the charging loop, and the normally open contact of the micro switch is grounded.
Preferably, in the battery charge-discharge control circuit of the present utility model, the charging circuit further includes a charge state detection unit and a charge state indication unit;
the first end of the charging state detection unit is connected with the first end of the charging switch unit, the second end of the charging state detection unit is connected with the power input end, and the third end of the charging state detection unit is connected with the charging state indication unit.
Preferably, in the battery charge-discharge control circuit of the present utility model, the charge state detection unit includes a second comparison unit and a third voltage division unit; the first end of the second comparison unit is connected with the first end of the charging switch unit, the first end of the third voltage division unit is connected with the power input end, the second end of the third voltage division unit is connected with the second end of the second comparison unit, the third end of the third voltage division unit is grounded, and the third end of the second comparison unit is connected with the charging state indication unit; and/or
The charging state indicating unit comprises a first light emitting diode, a second switching tube, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor; the first end of the second switch tube is connected with the first end of the eighth resistor, the second end of the eighth resistor is connected with the first end of the ninth resistor and the first end of the tenth resistor, the second end of the ninth resistor is connected with the power input end, the second end of the second switch tube is connected with the anode of the first light emitting diode, the third end of the second switch tube is connected with the first end of the sixth resistor, the second end of the sixth resistor and the first end of the seventh resistor are connected with the third end of the charging state detection unit, the second end of the seventh resistor is connected with the anode of the second light emitting diode, and the cathode of the first light emitting diode, the cathode of the second light emitting diode and the second end of the tenth resistor are all grounded.
Preferably, in the battery charge-discharge control circuit of the present utility model, the discharge circuit includes a discharge voltage detection unit, a reference voltage generation unit, and a discharge switching unit;
the first end of the discharge voltage detection unit and the first end of the reference voltage generation unit are connected with the second change-over switch, the second end of the discharge voltage detection unit is connected with the second end of the reference voltage generation unit, the third end of the discharge voltage detection unit is connected with the third end of the discharge switch unit, the first end of the discharge switch unit is used for being connected with a load, and the second end of the discharge switch unit is connected with the first change-over switch.
Preferably, in the battery charge-discharge control circuit of the present utility model, the discharge voltage detection unit includes a third comparison unit and a fourth voltage division unit; the first end of the third comparison unit is connected with the second end of the fourth voltage division unit, the first end of the fourth voltage division unit is connected with the second change-over switch, the third end of the fourth voltage division unit is grounded, the second end of the third comparison unit is connected with the reference voltage generation unit, and the output end of the third comparison unit is connected with the third end of the discharge switch unit; and/or
The discharge switch unit comprises a third switch tube and a fifth voltage division unit; the first end of the third switching tube is used for being connected with the first end of the load, the second end of the load is used for being connected with the second change-over switch, the third end of the third switching tube is connected with the second end of the fifth voltage dividing unit, the first end of the fifth voltage dividing unit is connected with the third end of the discharge voltage detecting unit, and the third end of the fifth voltage dividing unit and the second end of the third switching tube are grounded; and/or
The reference voltage generating unit comprises a voltage converting unit, a sixth voltage dividing unit, a fourth switching tube and an eleventh resistor; the first end of the voltage conversion unit is connected with the second change-over switch, the second end of the voltage conversion unit is connected with the first end of the sixth voltage division unit and the first end of the fourth switch tube, the second end of the sixth voltage division unit is connected with the second end of the discharge voltage detection unit and the second end of the fourth switch tube, the third end of the sixth voltage division unit is grounded, the third end of the fourth switch tube is connected with the first end of the eleventh resistor, and the second end of the eleventh resistor is connected with the output end of the third comparison unit.
The utility model also constructs an electronic device comprising a working circuit and the battery charge-discharge control circuit according to any one of the above, wherein the working circuit is connected with a discharge loop of the battery charge-discharge control circuit.
The battery charge and discharge control circuit and the electronic equipment have the following beneficial effects: the control process of battery charge and discharge can be realized with low cost.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a logic block diagram of one embodiment of a battery charge and discharge control circuit according to the present utility model;
FIG. 2 is a logic block diagram of another embodiment of a battery charge and discharge control circuit according to the present utility model;
FIG. 3 is a logic block diagram of another embodiment of a battery charge and discharge control circuit according to the present utility model;
FIG. 4 is a logic block diagram of another embodiment of a battery charge and discharge control circuit according to the present utility model;
fig. 5 is a schematic circuit diagram of an embodiment of a battery charge and discharge control circuit according to the present utility model.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings.
As shown in fig. 1, in a first embodiment of a battery charge and discharge control circuit of the present utility model, it includes: a battery 110, a first change-over switch 121, a second change-over switch 122, a charging circuit 130, and a discharging circuit 140; the first switch 121 is connected to the first end of the battery 110, the first end of the charging circuit 130, and the first end of the discharging circuit 140, respectively, and is used for switching the first end of the battery 110 to be conducted with the first end of the charging circuit 130 or the first end of the discharging circuit 140; the second switch 122 is connected to the second end of the battery 110, the second end of the charging circuit 130, and the second end of the discharging circuit 140, respectively, and is used for switching the second end of the battery 110 to be conducted with the second end of the charging circuit 130 or the second end of the discharging circuit 140; the charging circuit 130 includes a power input terminal 131, a charging switch unit 132, and a charging voltage detection unit 133; the first end of the charging switch unit 132 is connected to the first switch 121, the second end of the charging switch unit 132 is connected to the second end of the charging voltage detection unit 133, the first end of the charging voltage detection unit 133 is connected to the power input end 131 and the second switch 122, and the third end of the charging voltage detection unit 133 is connected to the third end of the charging switch unit 132. Specifically, the battery 110 is switched to be in conduction with the charging circuit 130 or in conduction with the discharging circuit 140 by the first and second switches 121 and 122. When the battery 110 is in conduction with the charging circuit 130, the charging process of the battery 110 is controlled by the charging circuit 130. When the battery 110 is connected to the discharge circuit 140, the discharge circuit 140 controls the discharge process of the battery 110. In the charging circuit 130, the power input end 131 is used for being connected with a power input, for example, a power adapter to obtain a corresponding power input, the charging switch unit 132 is connected with the first switch 121 and is used for controlling the on or off of the charging circuit 130, and when the charging switch unit 132 is on, the charging circuit 130 charges the battery 110 through the power input of the power input end 131. The charging voltage detecting unit 133 is configured to detect voltages at two ends of the battery 110 to obtain a voltage change during the charging process of the battery 110, and control the charging switch unit 132 to be turned on or off according to the voltage change, so as to ensure the safety of the charging process of the battery 110.
Alternatively, as shown in fig. 5, the charging voltage detecting unit 133 includes a first comparing unit, a first voltage dividing unit, and a second voltage dividing unit; the first end of first bleeder unit is connected power input end 131, and the first end of first comparison unit is connected to the second end of first bleeder unit, and the second end of first comparison unit is connected the second end of charging switch unit 132, and the first end of second bleeder unit is connected to the third end of charging switch unit 132, and the third end of first bleeder unit and the third end of second bleeder unit are all grounded. Specifically, when the battery 110 is switched to the charging circuit 130, the voltage at the second end of the battery 110 is input to the first end of the first comparing unit through the first voltage dividing unit, the voltage at the first end of the battery 110 is input to the second end of the first comparing unit, the first comparing unit compares the two inputs to obtain an output level, and the output level is divided by the second voltage dividing unit to form a control voltage, and the control voltage controls the on or off of the charging switch unit 132.
In an embodiment, the first comparing unit includes a first operational amplifier, a first capacitor and a first resistor; the in-phase input end of the first operational amplifier is connected with the second end of the first voltage dividing unit, the reverse input end of the first operational amplifier is connected with the first end of the first resistor and the first end of the first capacitor, the second end of the first resistor is connected with the second end of the charging switch unit 132, the second end of the first capacitor is grounded, and the output end of the first operational amplifier is connected with the first end of the second voltage dividing unit. Specifically, the first comparing unit may be composed of an operational amplifier chip and its peripheral circuit. As shown in fig. 5, the first operational amplifier includes an operational amplifier chip U1A, the first capacitor includes a capacitor C3, and the first resistor includes a resistor R2. The non-inverting input end of the operational amplifier chip U1A is connected with the second end of the first voltage dividing unit, the inverting input end of the operational amplifier chip U1A is connected to the second end of the charging switch unit 132 through the resistor R2, and meanwhile, an input signal of the inverting input end of the operational amplifier chip U1A can be subjected to filtering treatment through the capacitor C3.
In an embodiment, the first voltage dividing unit includes a second resistor, a third resistor and a second capacitor; the first end of the second resistor is connected with the power input end 131, the second end of the second resistor is connected with the first end of the third resistor, the first end of the second capacitor and the first end of the first comparison unit, and the second end of the third resistor and the second end of the second capacitor are grounded. Specifically, in the first voltage dividing unit, the second resistor may include a resistor R1, the third resistor may include a resistor R3, and the second capacitor may include a capacitor C9. That is, the resistor R1 and the resistor R3 are connected in series to obtain a divided voltage as an input to the non-inverting input terminal of the op-amp chip U1A. Meanwhile, the input signal of the operational amplifier chip U1A can be subjected to filtering processing through a capacitor C9.
In an embodiment, the second voltage dividing unit includes a fourth resistor and a fifth resistor, a first end of the fourth resistor is connected to the third end of the first comparing unit, a second end of the fourth resistor is connected to the third end of the charging switch unit 132 and the first end of the fifth resistor, and a second end of the fifth resistor is grounded. Specifically, in the second voltage dividing unit, the fourth resistor includes a resistor R21, and the fifth resistor includes a resistor R25. That is, the output level of the operational amplifier chip U1A generates a voltage division at its series node through a voltage division circuit composed of the resistor R21 and the resistor R25, and the charge switch unit 132 is controlled to be turned on or off by the voltage division.
Optionally, as shown in fig. 2, the charging circuit 130 further includes a charging current adjustment unit 135; a second terminal of the charging switch unit 132 is connected to a first terminal of the charging current adjusting unit 135, and a second terminal of the charging current adjusting unit 135 is grounded. Specifically, in the charging circuit 130, the charging current of the battery 110 during charging is regulated by the charging current regulating unit 135. In a specific embodiment, as shown in fig. 5, the charging current adjusting unit 135 may include several resistors connected in parallel or/and in series, for example, including a resistor R22, a resistor R23, and a resistor R24 connected in parallel, where one end of the resistor is connected to the second end of the charging switch unit 132, and the other end of the resistor is grounded, and the charging current of the charging loop 130 is adjusted by adjusting the parallel resistances of the resistor R22, the resistor R23, and the resistor R24.
As shown in fig. 5, in an embodiment, the charging switch unit 132 includes a first switch tube, a first end of the first switch tube is connected to the first switch 121, a second end of the first switch tube is connected to the second end of the charging voltage detecting unit 133 and the first end of the charging current adjusting unit 135, and a third end of the first switch tube is connected to the third end of the first comparing unit. Specifically, in the charging switch unit 132, the first switch tube may include a switch tube Q1, where a control end of the switch tube Q1 is connected to an output end of the first comparison unit, and the switch tube Q1 is controlled to be turned on or off according to an output of the first comparison unit. The switching tube Q1 can be a triode or a MOS tube.
Optionally, as shown in fig. 2, the charging circuit 130 further includes a reverse isolation unit 134, a first end of the reverse isolation unit 134 is connected to the first switch 121, and a second end of the reverse isolation unit 134 is connected to the first end of the charging switch unit 132. Specifically, a reverse isolation unit 134 is further disposed in the charging circuit 130 to prevent the voltage of the battery 110 from flowing backward. As shown in fig. 5, in an embodiment, the reverse isolation unit 134 includes a diode D2, an anode of the diode D2 is connected to the first switch 121, and a cathode of the diode D2 is connected to the first terminal of the charging switch unit 132.
Optionally, the second switch 122 includes a relay switch and a first diode; the first end of the coil of the relay switch and the cathode of the first diode are connected with the power input end 131, the second end of the coil of the relay switch and the anode of the first diode are grounded, the fixed contact of the relay switch is connected with the second end of the battery 110, the normally closed contact of the relay switch is connected with the second end of the charging loop 130, and the normally open contact of the relay switch is connected with the power input end 131. Specifically, as shown in fig. 5, the second switch 122 includes a relay switch K1, the first diode includes a diode D3, where a coil of the relay switch K1 is connected to the power input terminal 131, when the power input terminal 131 has a power input, the coil of the relay switch K1 is powered on, a normally open contact of the relay switch K1 is closed, and a second terminal of the battery 110 is connected to the power input terminal 131, that is, the second terminal of the battery 110 is connected to the charging circuit 130. The normally closed contact of the relay switch K1 is connected to the discharge circuit 140, and when no power is input to the power input terminal 131, the coil of the relay switch K1 is in a non-powered state, and at this time, the second terminal of the battery 110 is connected to the discharge circuit 140.
Optionally, the first switch 121 includes a micro switch, a common end of the micro switch is connected to the first end of the battery 110, a normally closed contact of the micro switch is connected to the first end of the charging circuit 130, and a normally open contact of the micro switch is grounded. Specifically, as shown in fig. 5, the first switch 121 includes a micro switch S1, where a common terminal of the micro switch S1 is connected to a first terminal of the battery 110, and the micro switch is triggered to switch the first terminal of the battery 110 to be connected to the charging circuit 130 or the discharging circuit 140. When the first end of the battery 110 is connected to the discharge circuit 140, the first end of the battery 110 may be directly connected to the ground through the micro switch S1, where the first end of the battery 110 corresponds to the negative electrode of the battery 110 and the second end of the battery 110 corresponds to the positive electrode of the battery 110.
Optionally, as shown in fig. 3, the charging circuit 130 further includes a charging state detection unit 136 and a charging state indication unit 137; a first end of the charge state detection unit 136 is connected to a first end of the charge switch unit 132, a second end of the charge state detection unit 136 is connected to the power input end 131, and a third end of the charge state detection unit 136 is connected to the charge state indication unit 137. Specifically, the state of charge indicating unit 137 may be controlled to indicate the state of charge by outputting a control signal corresponding to the operating state of the state of charge detection charging circuit 130. For example, the state of charge thereof may be a state in which the battery 110 is being charged or a state in which charging has been completed.
Optionally, the charge state detection unit 136 includes a second comparing unit and a third voltage dividing unit; the first end of the second comparing unit is connected with the first end of the charging switch unit 132, the first end of the third voltage dividing unit is connected with the power input end 131, the second end of the third voltage dividing unit is connected with the second end of the second comparing unit, the third end of the third voltage dividing unit is grounded, and the third end of the second comparing unit is connected with the charging state indicating unit 137. Specifically, when the battery 110 is connected to the charging circuit 130, the voltage of the second terminal of the battery 110 may be divided by the third voltage dividing unit to be input to the second terminal of the second comparing unit, where the first terminal of the second comparing unit is used to obtain the voltage of the first terminal of the battery 110, and the second comparing unit compares the voltages to obtain the current charging state of the battery 110. Wherein when the first terminal voltage of the second comparing unit is greater than the second terminal voltage, the battery 110 is indicated to be in a charged state, and corresponding indication information is generated by the charged state indicating unit 137. When the first terminal voltage of the second comparing unit is less than the second terminal voltage, indicating that the battery 110 has been charged, corresponding indication information is generated by the charge state indicating unit 137 to indicate that the charging is completed. The second comparing unit may include an operational amplifier chip U1B, where a non-inverting input end of the operational amplifier chip U1B is connected to the first end of the charging switch unit 132, a inverting input end of the operational amplifier chip U1B is connected to the second end of the third voltage dividing unit, and an output end of the operational chip U1B is used to output a high-low level to control the action of the charging state indicating unit 137. The third voltage dividing unit may be composed of a resistor R5 and a resistor R6 connected in series, and filter-process the resulting divided voltage through a capacitor C4.
Optionally, the charge state indicating unit 137 includes a first light emitting diode, a second switching tube, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, and a tenth resistor; the first end of the second switch tube is connected with the first end of the eighth resistor, the second end of the eighth resistor is connected with the first end of the ninth resistor and the first end of the tenth resistor, the second end of the ninth resistor is connected with the power input end 131, the second end of the second switch tube is connected with the anode of the first light emitting diode, the third end of the second switch tube is connected with the first end of the sixth resistor, the second end of the sixth resistor and the first end of the seventh resistor are connected with the third end of the charge state detection unit 136, the second end of the seventh resistor is connected with the anode of the second light emitting diode, and the cathode of the first light emitting diode, the cathode of the second light emitting diode and the second end of the tenth resistor are grounded. Specifically, in the charge state indicating unit 137, the first light emitting diode includes the light emitting diode D1-1, the second light emitting diode includes the light emitting diode D1-2, the sixth resistor includes the resistor R16, the seventh resistor includes the resistor R7, the eighth resistor includes the resistor R26, the ninth resistor includes the resistor R17, the tenth resistor includes the resistor R15, and the second switching tube includes the switching tube Q3. The op-amp chip U1B may be set to output a high level when the battery 110 is in a charged state. When the output of the operational amplifier chip U1B is high, the high level drives the light emitting diode D1-2 to emit light through the resistor R7, and the switching tube Q3 is driven to be in an off state by the high level. The operational amplifier chip U1B may be configured to output a low level when the battery 110 is in a charged state, and the switching tube Q3 is turned on when the operational amplifier chip U1B outputs a low level, so that the light emitting diode D1-1 emits light. The charge progress state and the charge completion state of the battery 110 can be distinguished by setting the light emitting colors of the light emitting diodes D1-2 and D1-1. The switching transistor Q3 may be a triode or a MOS transistor.
Alternatively, the discharge loop 140 includes a discharge voltage detection unit 141, a reference voltage generation unit 142, and a discharge switching unit 143; the first terminal of the discharge voltage detection unit 141 and the first terminal of the reference voltage generation unit 142 are connected to the second switch 122, the second terminal of the discharge voltage detection unit 141 is connected to the second terminal of the reference voltage generation unit 142, the third terminal of the discharge voltage detection unit 141 is connected to the third terminal of the discharge switch unit 143, wherein the first terminal of the discharge switch unit 143 is used to connect to a load, and the second terminal of the discharge switch unit 143 is connected to the first switch 121. Specifically, when the battery 110 is connected to the discharge circuit 140, a reference voltage may be generated by the reference voltage generating unit 142, the discharge voltage of the discharge circuit 140 may be detected by the discharge voltage detecting unit 141, the discharge voltage and the reference voltage may be compared, and a corresponding control signal may be output according to the comparison result to control the discharge switch unit 143 to be turned on or off, so as to realize the on or off of the load and the battery 110.
Alternatively, as shown in fig. 5, the discharge voltage detection unit 141 includes a third comparison unit and a fourth voltage division unit; the first end of the third comparing unit is connected with the second end of the fourth voltage dividing unit, the first end of the fourth voltage dividing unit is connected with the second change-over switch 122, the third end of the fourth voltage dividing unit is grounded, the second end of the third comparing unit is connected with the reference voltage generating unit 142, and the output end of the third comparing unit is connected with the third end of the discharging switch unit 143. Specifically, in the discharge voltage detection unit 141, the voltage at the second terminal of the battery 110 may be detected by the fourth voltage division unit to obtain a divided voltage, the divided voltage is input to the first terminal of the third comparison unit, the output of the reference voltage generation unit 142 is input to the second terminal of the third comparison unit, and the third terminal of the third comparison unit inputs the comparison result. The third comparing unit may include an op-amp chip U2B, and the fourth voltage dividing unit may include a resistor R12, a resistor R13, and a capacitor C5, where the resistor R12 and the resistor R13 form a serial link to form a voltage division input to the non-inverting input end of the op-amp chip U2B, and meanwhile, the input signal may be filtered through the capacitor C5. The reference voltage generated by the reference voltage generation unit 142 is input to the inverting input terminal of the op-amp chip U2B.
Optionally, the discharge switching unit 143 includes a third switching tube and a fifth voltage dividing unit; the first end of the third switching tube is used for connecting the first end of the load, wherein the second end of the load is used for connecting the second change-over switch 122, the third end of the third switching tube is connected with the second end of the fifth voltage dividing unit, the first end of the fifth voltage dividing unit is connected with the third end of the discharge voltage detecting unit 141, and the third end of the fifth voltage dividing unit and the second end of the third switching tube are grounded. Specifically, the third switching tube includes a switching tube Q2, and the output of the op-amp chip U2B is input to the control end, i.e., the third end, of the switching tube Q2 after being divided by the fifth voltage dividing unit, so as to control the switching tube Q2 to be turned on or off, thereby realizing the on or off of the load. The switching tube Q2 can be an MOS tube or a triode, and the fifth voltage dividing unit can be formed by connecting a resistor R14 and a resistor R4 in series.
Optionally, the reference voltage generating unit 142 includes a voltage converting unit, a sixth voltage dividing unit, a fourth switching tube, and an eleventh resistor; the first end of the voltage conversion unit is connected with the second change-over switch 122, the second end of the voltage conversion unit is connected with the first end of the sixth voltage division unit and the first end of the fourth switching tube, the second end of the sixth voltage division unit is connected with the second end of the discharge voltage detection unit 141 and the second end of the fourth switching tube, the third end of the sixth voltage division unit is grounded, the third end of the fourth switching tube is connected with the first end of the eleventh resistor, and the second end of the eleventh resistor is connected with the output end of the third comparison unit. Specifically, the fourth switching tube may include a switching tube Q4, and the voltage converting unit converts the output voltage of the battery 110 to obtain an output voltage, where the output voltage is divided by the sixth voltage dividing unit and then generates a reference voltage at the inverting input terminal of the op-amp chip U2B. Meanwhile, the switching tube Q4 can be controlled to be turned on or off through the output of the operational amplifier chip U2B. The specific process is that when the voltage of the positive input end of the operational amplifier chip U2B is smaller than the voltage of the negative input end (reference voltage), the operational amplifier chip U2B outputs a low level, the switching tube Q4 is turned on, meanwhile, the switching tube Q2 is turned off, and the load is powered off. The sixth voltage dividing unit may have a resistor R10 and a resistor R11 connected in series, and perform filtering processing on the divided voltage through a capacitor C7. The voltage conversion unit may be composed of a voltage conversion chip U3 and its peripheral circuits for outputting a stable voltage.
In addition, the electronic device of the present utility model includes an operating circuit and a battery charge-discharge control circuit as described in any one of the above, wherein the operating circuit is connected to the discharge circuit 140 of the battery charge-discharge control circuit. Specifically, the working circuit may be powered by the above-mentioned battery charge-discharge control circuit, where the working circuit may be understood as a load, and is connected to the discharge circuit 140 in the battery charge-discharge control circuit. In one embodiment, the operating circuit may be a DC motor.
It is to be understood that the above examples only represent preferred embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the utility model; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (12)
1. A battery charge-discharge control circuit, comprising: the device comprises a battery, a first change-over switch, a second change-over switch, a charging loop and a discharging loop;
the first switch is respectively connected with the first end of the battery, the first end of the charging loop and the first end of the discharging loop and is used for switching the first end of the battery to be conducted with the first end of the charging loop or the first end of the discharging loop;
the second change-over switch is respectively connected with the second end of the battery, the second end of the charging loop and the second end of the discharging loop and is used for switching the second end of the battery to be conducted with the second end of the charging loop or the second end of the discharging loop;
the charging circuit comprises a power input end, a charging switch unit and a charging voltage detection unit;
the first end of the charging switch unit is connected with the first change-over switch, the second end of the charging switch unit is connected with the second end of the charging voltage detection unit, the first end of the charging voltage detection unit is connected with the power input end and the second change-over switch, and the third end of the charging voltage detection unit is connected with the third end of the charging switch unit.
2. The battery charge-discharge control circuit according to claim 1, wherein the charge voltage detection unit includes a first comparison unit, a first voltage division unit, and a second voltage division unit;
the first end of the first voltage division unit is connected with the power input end, the second end of the first voltage division unit is connected with the first end of the first comparison unit, the second end of the first comparison unit is connected with the second end of the charging switch unit, the third end of the first comparison unit is connected with the first end of the second voltage division unit, the second end of the second voltage division unit is connected with the third end of the charging switch unit, and the third end of the first voltage division unit and the third end of the second voltage division unit are grounded.
3. The battery charge and discharge control circuit according to claim 2, wherein,
the first comparison unit comprises a first operational amplifier, a first capacitor and a first resistor; the non-inverting input end of the first operational amplifier is connected with the second end of the first voltage dividing unit, the inverting input end of the first operational amplifier is connected with the first end of the first resistor and the first end of the first capacitor, the second end of the first resistor is connected with the second end of the charging switch unit, the second end of the first capacitor is grounded, and the output end of the first operational amplifier is connected with the first end of the second voltage dividing unit; and/or
The first voltage dividing unit comprises a second resistor, a third resistor and a second capacitor; the first end of the second resistor is connected with the power input end, the second end of the second resistor is connected with the first end of the third resistor, the first end of the second capacitor and the first end of the first comparison unit, and the second end of the third resistor and the second end of the second capacitor are grounded; and/or
The second voltage division unit comprises a fourth resistor and a fifth resistor, a first end of the fourth resistor is connected with a third end of the first comparison unit, a second end of the fourth resistor is connected with the third end of the charging switch unit and the first end of the fifth resistor, and a second end of the fifth resistor is grounded.
4. The battery charge-discharge control circuit according to claim 2, wherein the charging circuit further comprises a charging current adjusting unit;
the second end of the charging switch unit is connected with the first end of the charging current adjusting unit, and the second end of the charging current adjusting unit is grounded.
5. The battery charge-discharge control circuit according to claim 4, wherein the charge switch unit includes a first switch tube, a first end of the first switch tube is connected to the first switch, a second end of the first switch tube is connected to the second end of the charge voltage detection unit and the first end of the charge current adjustment unit, and a third end of the first switch tube is connected to the third end of the first comparison unit.
6. The battery charge-discharge control circuit of claim 1, wherein the charging circuit further comprises a reverse isolation unit, a first end of the reverse isolation unit is connected to the first switch, and a second end of the reverse isolation unit is connected to the first end of the charging switch unit.
7. The battery charge and discharge control circuit according to claim 1, wherein,
the second transfer switch comprises a relay switch and a first diode; the first end of the coil of the relay switch and the cathode of the first diode are connected with the power input end, the second end of the coil of the relay switch and the anode of the first diode are grounded, the fixed contact of the relay switch is connected with the second end of the battery, the normally closed contact of the relay switch is connected with the second end of the charging loop, and the normally open contact of the relay switch is connected with the power input end; and/or
The first switch comprises a micro switch, the public end of the micro switch is connected with the first end of the battery, the normally closed contact of the micro switch is connected with the first end of the charging loop, and the normally open contact of the micro switch is grounded.
8. The battery charge-discharge control circuit according to claim 1, wherein the charging circuit further comprises a charge state detection unit and a charge state indication unit;
the first end of the charging state detection unit is connected with the first end of the charging switch unit, the second end of the charging state detection unit is connected with the power input end, and the third end of the charging state detection unit is connected with the charging state indication unit.
9. The battery charge and discharge control circuit according to claim 8, wherein,
the charging state detection unit comprises a second comparison unit and a third voltage division unit; the first end of the second comparison unit is connected with the first end of the charging switch unit, the first end of the third voltage division unit is connected with the power input end, the second end of the third voltage division unit is connected with the second end of the second comparison unit, the third end of the third voltage division unit is grounded, and the third end of the second comparison unit is connected with the charging state indication unit; and/or
The charging state indicating unit comprises a first light emitting diode, a second switching tube, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor; the first end of the second switch tube is connected with the first end of the eighth resistor, the second end of the eighth resistor is connected with the first end of the ninth resistor and the first end of the tenth resistor, the second end of the ninth resistor is connected with the power input end, the second end of the second switch tube is connected with the anode of the first light emitting diode, the third end of the second switch tube is connected with the first end of the sixth resistor, the second end of the sixth resistor and the first end of the seventh resistor are connected with the third end of the charging state detection unit, the second end of the seventh resistor is connected with the anode of the second light emitting diode, and the cathode of the first light emitting diode, the cathode of the second light emitting diode and the second end of the tenth resistor are all grounded.
10. The battery charge-discharge control circuit according to claim 1, wherein the discharge circuit includes a discharge voltage detection unit, a reference voltage generation unit, and a discharge switch unit;
the first end of the discharge voltage detection unit and the first end of the reference voltage generation unit are connected with the second change-over switch, the second end of the discharge voltage detection unit is connected with the second end of the reference voltage generation unit, the third end of the discharge voltage detection unit is connected with the third end of the discharge switch unit, the first end of the discharge switch unit is used for being connected with a load, and the second end of the discharge switch unit is connected with the first change-over switch.
11. The battery charge and discharge control circuit according to claim 10, wherein,
the discharge voltage detection unit comprises a third comparison unit and a fourth voltage division unit; the first end of the third comparison unit is connected with the second end of the fourth voltage division unit, the first end of the fourth voltage division unit is connected with the second change-over switch, the third end of the fourth voltage division unit is grounded, the second end of the third comparison unit is connected with the reference voltage generation unit, and the output end of the third comparison unit is connected with the third end of the discharge switch unit; and/or
The discharge switch unit comprises a third switch tube and a fifth voltage division unit; the first end of the third switching tube is used for being connected with the first end of the load, the second end of the load is used for being connected with the second change-over switch, the third end of the third switching tube is connected with the second end of the fifth voltage dividing unit, the first end of the fifth voltage dividing unit is connected with the third end of the discharge voltage detecting unit, and the third end of the fifth voltage dividing unit and the second end of the third switching tube are grounded; and/or
The reference voltage generating unit comprises a voltage converting unit, a sixth voltage dividing unit, a fourth switching tube and an eleventh resistor; the first end of the voltage conversion unit is connected with the second change-over switch, the second end of the voltage conversion unit is connected with the first end of the sixth voltage division unit and the first end of the fourth switch tube, the second end of the sixth voltage division unit is connected with the second end of the discharge voltage detection unit and the second end of the fourth switch tube, the third end of the sixth voltage division unit is grounded, the third end of the fourth switch tube is connected with the first end of the eleventh resistor, and the second end of the eleventh resistor is connected with the output end of the third comparison unit.
12. An electronic device comprising an operating circuit, and a battery charge-discharge control circuit according to any one of claims 1 to 11, wherein the operating circuit is connected to a discharge loop of the battery charge-discharge control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223394357.1U CN219067899U (en) | 2022-12-16 | 2022-12-16 | Battery charge-discharge control circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223394357.1U CN219067899U (en) | 2022-12-16 | 2022-12-16 | Battery charge-discharge control circuit and electronic equipment |
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| Publication Number | Publication Date |
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| CN219067899U true CN219067899U (en) | 2023-05-23 |
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| CN202223394357.1U Active CN219067899U (en) | 2022-12-16 | 2022-12-16 | Battery charge-discharge control circuit and electronic equipment |
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| Country | Link |
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| CN (1) | CN219067899U (en) |
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