CN115224778B - Self-adaptive discharging circuit and discharging method for charging adapter - Google Patents
Self-adaptive discharging circuit and discharging method for charging adapter Download PDFInfo
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- CN115224778B CN115224778B CN202211060312.2A CN202211060312A CN115224778B CN 115224778 B CN115224778 B CN 115224778B CN 202211060312 A CN202211060312 A CN 202211060312A CN 115224778 B CN115224778 B CN 115224778B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- 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
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Abstract
The invention provides a self-adaptive discharging circuit and a discharging method for a charging adapter, wherein the circuit comprises resistors R1, R2, R3, R4 and R5, operational amplifiers OP1 and OP2, a comparator1, a voltage selector, MOS (metal oxide semiconductor) tubes M1 and M2, voltage sources vref1 and vlow and a current source Iref2; the discharging method comprises the following steps: the voltage v1 at the first input end of the voltage selector is influenced by the change of the voltage VIN at the charging end; the voltage selector outputs a voltage vout1 by comparing v1 with vref1; the synthesizer 1 controls the on-off of the OP1 by comparing the v1 with the vlow, and realizes the self-adaptive adjustment of the discharge current I _ dis according to the change of the voltage VIN at the charging end. The invention can automatically adjust the discharging current according to the charging terminal voltage of the charging adapter, so that the discharging power is always close to the maximum power of the chip and the system, thereby reducing the discharging time.
Description
Technical Field
The invention relates to the technical field of charging adapters, in particular to a self-adaptive discharging circuit and a self-adaptive discharging method for a charging adapter.
Background
At present, sectional discharging is adopted for discharging of charging adapters of mobile phones, notebook computers and the like, low discharging current is adopted when the voltage of the charging end of the charging adapter is high, and high discharging current is adopted when the voltage of the charging end of the charging adapter is low; such a segmented discharge is generally divided into 3 or more segments, and has the following problems:
firstly, the design and control are too complex;
secondly, if the discharge time is to be made shorter, more stages are required, and the accuracy of the discharge current is required to be higher.
Disclosure of Invention
The invention aims to provide a self-adaptive discharging circuit and a self-adaptive discharging method for a charging adapter, so that the discharging current is automatically adjusted according to the voltage of a charging end of the charging adapter, the discharging power is always close to the maximum power of a chip and a system, and the discharging time is reduced.
The invention provides an adaptive discharging circuit for a charging adapter, which comprises: the voltage source comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an operational amplifier OP1, an operational amplifier OP2, a comparator1, a voltage selector, a MOS tube M1, a MOS tube M2, a voltage source vref1, a voltage source vlow and a current source Iref2;
the first input end of the voltage selector is connected with the charging end of the charging adapter through a resistor R4 on one hand, and is grounded through a resistor R5 on the other hand; the second input end of the voltage selector is grounded through a voltage source vref1; the output end of the voltage selector is connected with the positive input end of the operational amplifier OP 1; the negative input end of the operational amplifier OP1 is grounded through a resistor R3; the output end of the operational amplifier OP1 is connected with the grid electrode of the MOS tube M1; the control end of the operational amplifier OP1 is connected with the output end of the comparator 1; the positive input end of the comparator1 is grounded through a resistor R5; the negative input end of the comparator1 is grounded through a voltage source vlow; the current source Iref2 is grounded through a resistor R1; an electrical connection point between the current source Iref2 and the resistor R1 is connected with the drain electrode of the MOS tube M1 on one hand and the positive input end of the operational amplifier OP2 on the other hand; the source electrode of the MOS tube M1 is grounded through a resistor R3; the negative input end of the operational amplifier OP2 is grounded through a resistor R2; the output end of the operational amplifier OP2 is connected with the grid electrode of the MOS tube M2; the drain electrode of the MOS tube M2 is connected with the charging end of the charging adapter; the source electrode of the MOS tube M2 is grounded through a resistor R2.
The invention also provides a self-adaptive discharging method for the charging adapter, which is realized by adopting the discharging circuit;
the discharge method includes:
the voltage v1 at the first input end of the voltage selector is influenced by the change of the voltage VIN at the charging end of the charging adapter; the voltage selector outputs a voltage vout1 by comparing v1 with vref1; meanwhile, the comparator1 controls the on/off of the operational amplifier OP1 by comparing the v1 with the vlow, so that the discharging current I _ dis of the charging end of the charging adapter is adaptively adjusted according to the change of the voltage VIN of the charging end of the charging adapter.
Further, the method for the voltage selector to output the voltage vout1 by comparing v1 with vref1 is as follows:
when v1< vref1, vout1= v1;
when v1 is more than or equal to vref1, vout1= vref1;
wherein v1= VIN × R5/(R4 + R5).
Further, the discharge method includes:
when the voltage VIN of the charging end of the charging adapter is too high, so that v1 is more than or equal to vref1, vout1= vref1; meanwhile, the output of the comparator1 is high, the operational amplifier OP1 is opened, and the MOS tube M1 is conducted; at the moment, the discharging current I _ dis of the charging end is determined according to vref1 and is the minimum discharging current of the charging end;
when the charging terminal voltage VIN of the charging adapter is too low, v1< vlow; meanwhile, the output of the comparator1 is low, the operational amplifier OP1 is turned off, the output of the operational amplifier OP1 is pulled low, and the MOS transistor M1 is disconnected; at the moment, the discharging current I _ dis of the charging end is irrelevant to both v1 and vref1 and is the maximum discharging current of the charging end;
when the charging terminal voltage VIN of the charging adapter is such that vlow < v1< vref1, vout1= v1; meanwhile, the output of the comparator1 is high, the operational amplifier OP1 is opened, and the MOS tube M1 is conducted; the discharge current I _ dis at the charging terminal at this time is related to v 1.
Further, when the charging terminal voltage VIN of the charging adapter is too high, so that v1 is larger than or equal to vref1, the discharging current I _ dis is expressed as:
I_dis=(Iref2-vref1/R3)×(R1/R2)。
further, when the charging terminal voltage VIN of the charging adapter is too low so that v1< Vlow, the discharging current I _ dis is represented as:
I_dis=Iref2×(R1/R2)。
further, when the charging terminal voltage VIN of the charging adapter is such that vlow < v1< vref1, the discharging current I _ dis is represented as:
I_dis=(Iref2-[VIN×R5/(R4+R5)]/R3)×(R1/R2)。
in summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the invention can automatically adjust the discharging current according to the charging terminal voltage of the charging adapter, so that the discharging power is always close to the maximum power of the chip and the system, thereby reducing the discharging time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and it is obvious for those skilled in the art that other related drawings can be obtained according to these drawings without inventive efforts.
Fig. 1 is a block diagram of an adaptive discharge circuit for a charging adapter according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
As shown in fig. 1, the present embodiment proposes an adaptive discharge circuit for a charging adapter, including: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an operational amplifier OP1, an operational amplifier OP2, a comparator1, a voltage selector, an MOS tube M1, an MOS tube M2, a voltage source vref1, a voltage source vlow and a current source Iref2;
the first input end of the voltage selector is connected with the charging end of the charging adapter through a resistor R4 on one hand, and is grounded through a resistor R5 on the other hand; the second input end of the voltage selector is grounded through a voltage source vref1; the output end of the voltage selector is connected with the positive input end of the operational amplifier OP 1; the negative input end of the operational amplifier OP1 is grounded through a resistor R3; the output end of the operational amplifier OP1 is connected with the grid electrode of the MOS tube M1; the control end of the operational amplifier OP1 is connected with the output end of the comparator 1; the positive input end of the comparator1 is grounded through a resistor R5; the negative input end of the comparator1 is grounded through a voltage source vlow; the current source Iref2 is grounded through a resistor R1; an electrical connection point between the current source Iref2 and the resistor R1 is connected with the drain electrode of the MOS tube M1 on one hand and the positive input end of the operational amplifier OP2 on the other hand; the source electrode of the MOS tube M1 is grounded through a resistor R3; the negative input end of the operational amplifier OP2 is grounded through a resistor R2; the output end of the operational amplifier OP2 is connected with the grid electrode of the MOS tube M2; the drain electrode of the MOS tube M2 is connected with the charging end of the charging adapter; the source of the MOS transistor M2 is grounded via a resistor R2.
The discharging method based on the adaptive discharging circuit for the charging adapter is as follows:
the voltage v1 at the first input end of the voltage selector is influenced by the change of the voltage VIN at the charging end of the charging adapter; the voltage selector outputs a voltage vout1 by comparing v1 with vref1; meanwhile, the comparator comporator 1 controls the on/off of the operational amplifier OP1 by comparing the v1 with the vlow, so that the discharging current I _ dis of the charging end of the charging adapter is adaptively adjusted according to the change of the voltage VIN of the charging end of the charging adapter.
The method for the voltage selector to output the voltage vout1 by comparing v1 with vref1 includes:
when v1< vref1, vout1= v1;
when v1 is more than or equal to vref1, vout1= vref1;
wherein v1= VIN × R5/(R4 + R5).
Meanwhile, according to the structure of the discharging circuit, the discharging current I _ dis of the charging terminal of the charging adapter is represented as:
I_dis=V_dis/R2；
wherein V _ dis = (Iref 2-Vout 1/R3) × R1.
Thus, the discharge method specifically includes the following three cases:
in the first case: when the voltage VIN of the charging end of the charging adapter is too high, so that v1 is more than or equal to vref1, vout1= vref1; meanwhile, the output of the comparator1 is high, the operational amplifier OP1 is opened, and the MOS tube M1 is conducted; at the moment, the discharging current I _ dis of the charging end is determined according to vref1 and is the minimum discharging current of the charging end; the discharge current I _ dis at this time is represented as:
I_dis=(Iref2-vref1/R3)×(R1/R2)。
in the second case: when the charging terminal voltage VIN of the charging adapter is too low, v1< vlow; meanwhile, the output of the comparator1 is low, the operational amplifier OP1 is turned off, the output of the operational amplifier OP1 is pulled low, and the MOS transistor M1 is disconnected; at the moment, the discharging current I _ dis of the charging end is irrelevant to both v1 and vref1 and is the maximum discharging current of the charging end; the discharge current I _ dis at this time is represented as:
I_dis=Iref2×(R1/R2)。
in the third case: when the charging terminal voltage VIN of the charging adapter is such that vlow < v1< vref1, vout1= v1; meanwhile, the output of the comparator1 is high, the operational amplifier OP1 is turned on, and the MOS tube M1 is conducted; the discharge current I _ dis at the charging terminal at this time is related to v 1. The discharge current I _ dis at this time is represented as:
I_dis=(Iref2-[VIN×R5/(R4+R5)]/R3)×(R1/R2)。
as can be seen from the above, the self-adaptive discharging circuit and the discharging method for the charging adapter provided in this embodiment can automatically adjust the discharging current I _ dis according to the charging terminal voltage VIN of the charging adapter, so that the discharging power is always close to the maximum power of the chip and the system, thereby reducing the discharging time.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An adaptive discharge circuit for a charging adapter, the discharge circuit comprising: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an operational amplifier OP1, an operational amplifier OP2, a comparator1, a voltage selector, an MOS tube M1, an MOS tube M2, a voltage source vref1, a voltage source vlow and a current source Iref2;
the first input end of the voltage selector is connected with the charging end of the charging adapter through a resistor R4 on one hand, and is grounded through a resistor R5 on the other hand; the second input end of the voltage selector is grounded through a voltage source vref1; the output end of the voltage selector is connected with the positive input end of the operational amplifier OP 1; the negative input end of the operational amplifier OP1 is grounded through a resistor R3; the output end of the operational amplifier OP1 is connected with the grid electrode of the MOS tube M1; the control end of the operational amplifier OP1 is connected with the output end of the comparator 1; the positive input end of the comparator1 is grounded through a resistor R5; the negative input end of the comparator1 is grounded through a voltage source vlow; the current source Iref2 is grounded through a resistor R1; an electrical connection point between the current source Iref2 and the resistor R1 is connected with the drain electrode of the MOS tube M1 on one hand and the positive input end of the operational amplifier OP2 on the other hand; the source electrode of the MOS tube M1 is grounded through a resistor R3; the negative input end of the operational amplifier OP2 is grounded through a resistor R2; the output end of the operational amplifier OP2 is connected with the grid electrode of the MOS tube M2; the drain electrode of the MOS tube M2 is connected with the charging end of the charging adapter; the source of the MOS transistor M2 is grounded via a resistor R2.
2. An adaptive discharging method for a charging adapter, characterized in that the discharging method is implemented by using the discharging circuit of claim 1;
the discharge method includes:
the voltage v1 at the first input end of the voltage selector is influenced by the change of the voltage VIN at the charging end of the charging adapter; the voltage selector outputs a voltage vout1 by comparing v1 with vref1; meanwhile, the comparator1 controls the on/off of the operational amplifier OP1 by comparing the v1 with the vlow, so that the discharging current I _ dis of the charging end of the charging adapter is adaptively adjusted according to the change of the voltage VIN of the charging end of the charging adapter.
3. The adaptive discharging method for a charge adapter according to claim 2, wherein the method by which the voltage selector outputs the voltage vout1 by comparing v1 with vref1 is:
when v1< vref1, vout1= v1;
when v1 is more than or equal to vref1, vout1= vref1;
wherein v1= VIN × R5/(R4 + R5).
4. The adaptive discharging method for a charging adapter according to claim 3, characterized in that the discharging method comprises:
when the charging end voltage VIN of the charging adapter is too high, so that v1 is more than or equal to vref1, vout1= vref1; meanwhile, the output of the comparator1 is high, the operational amplifier OP1 is opened, and the MOS tube M1 is conducted; at the moment, the discharging current I _ dis of the charging end is determined according to vref1 and is the minimum discharging current of the charging end;
when the charging terminal voltage VIN of the charging adapter is too low, v1< vlow; meanwhile, the output of the comparator1 is low, the operational amplifier OP1 is turned off, the output of the operational amplifier OP1 is pulled low, and the MOS transistor M1 is disconnected; at the moment, the discharging current I _ dis of the charging end is irrelevant to both v1 and vref1 and is the maximum discharging current of the charging end;
when the charging terminal voltage VIN of the charging adapter is such that vlow < v1< vref1, vout1= v1; meanwhile, the output of the comparator1 is high, the operational amplifier OP1 is opened, and the MOS tube M1 is conducted; the discharge current I _ dis at the charging terminal at this time is related to v 1.
5. The adaptive discharging method for the charging adapter according to claim 4, wherein when the charging terminal voltage VIN of the charging adapter is too high so that v1 is greater than or equal to vref1, the discharging current I _ dis is expressed as:
I_dis=(Iref2-vref1/R3)×(R1/R2)。
6. the adaptive discharging method for the charging adapter according to claim 4, wherein when the charging terminal voltage VIN of the charging adapter is too low so that v1< Vlow, the discharging current I _ dis is expressed as:
I_dis=Iref2×(R1/R2)。
7. the adaptive discharging method for a charging adapter according to claim 4, characterized in that when the charging terminal voltage VIN of the charging adapter is such that vlow < v1< vref1, the discharging current I _ dis is expressed as:
I_dis=(Iref2-[VIN×R5/(R4+R5)]/R3)×(R1/R2)。
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| CN202211060312.2A CN115224778B (en) | 2022-08-31 | 2022-08-31 | Self-adaptive discharging circuit and discharging method for charging adapter |
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| CN101436083A (en) * | 2008-12-11 | 2009-05-20 | 电子科技大学 | High speed constant flow output drive circuit |
| CN105490333A (en) * | 2015-12-18 | 2016-04-13 | 深圳市芯沃微电子有限公司 | Rapid charging control circuit for battery, adapter and mobile equipment |
| CN107492929A (en) * | 2017-08-30 | 2017-12-19 | 南京中感微电子有限公司 | It is provided with the charging circuit of current protecting circuit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204089595U (en) * | 2014-06-27 | 2015-01-07 | 意法半导体研发(深圳)有限公司 | Power inverter |
| CN110429801B (en) * | 2019-08-12 | 2021-04-13 | 上海南芯半导体科技有限公司 | Chip control circuit based on SR technology and implementation method |
| CN111725996B (en) * | 2020-07-13 | 2021-07-09 | 上海南芯半导体科技有限公司 | Control circuit and method for improving precision of pseudo-fixed frequency in constant turn-off time control mode |
| CN114910690B (en) * | 2022-07-19 | 2022-09-20 | 成都市易冲半导体有限公司 | Multiplexing trimming structure and method for current high-precision sampling system in charging control chip |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101436083A (en) * | 2008-12-11 | 2009-05-20 | 电子科技大学 | High speed constant flow output drive circuit |
| CN105490333A (en) * | 2015-12-18 | 2016-04-13 | 深圳市芯沃微电子有限公司 | Rapid charging control circuit for battery, adapter and mobile equipment |
| CN107492929A (en) * | 2017-08-30 | 2017-12-19 | 南京中感微电子有限公司 | It is provided with the charging circuit of current protecting circuit |
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