CN108054810B - Charging control circuit and charging power supply equipment - Google Patents
Charging control circuit and charging power supply equipment Download PDFInfo
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- CN108054810B CN108054810B CN201810067904.4A CN201810067904A CN108054810B CN 108054810 B CN108054810 B CN 108054810B CN 201810067904 A CN201810067904 A CN 201810067904A CN 108054810 B CN108054810 B CN 108054810B
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- 238000005070 sampling Methods 0.000 claims abstract description 40
- 238000006243 chemical reaction Methods 0.000 claims abstract description 36
- 230000003321 amplification Effects 0.000 claims abstract description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 59
- 238000001514 detection method Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- 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
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a charging control circuit and a charging power supply device. The charging control circuit comprises a voltage conversion circuit, a sampling resistor, an amplifying circuit and a control circuit; the input end of the voltage conversion circuit is connected with the charging power supply, and the voltage of the charging power supply is converted and then is output to the equipment to be charged through the output end; the sampling resistor is connected in series with the output end of the voltage conversion circuit; the amplifying circuit is connected with two ends of the sampling resistor, the output end of the amplifying circuit is connected with the control circuit, the amplifying circuit collects the voltage drop on the sampling resistor, amplifies the voltage drop and outputs the amplified voltage drop to the control circuit; the control end of the control circuit is connected with the enabling end of the voltage conversion circuit so as to close the voltage conversion circuit when the amplified voltage drop is not larger than a preset value. Through setting up sampling resistor and amplifier circuit in charging circuit, control charge with the help of the voltage drop signal of amplification and cut off, solved originally the charging current and undersize and lead to unable detected problem, the charge degree is higher, has improved the duration of consumer.
Description
Technical Field
The present invention relates to a charge control circuit and a charging power supply device.
Background
At present, portable electronic equipment such as mobile phones and Bluetooth headsets provide great convenience for daily life of people. However, in the prior art, when charging these portable devices, the charging circuit is usually built only with a resistor, and accurate detection of the charging current of the earphone and the like cannot be achieved. For example, due to the large detection error, the accuracy is limited, and the earphone is not charged when the charging current is about 15mA, so that the earphone cannot be fully charged. With the continuous updating of new portable products such as earphones, the requirement for charging is higher and higher, especially because the earphone is miniaturized more and more, but firstly, the problem that the conversation time of the earphone is not long enough due to the fact that the battery volume capacity is not full of charging, and normal use is affected.
Therefore, it is desirable to provide a solution that can detect the charging current more accurately to ensure that the headset is fully charged as much as possible for talk time.
Disclosure of Invention
In view of the problem of charging dissatisfaction caused by inaccurate detection of charging current of portable devices such as headphones in the prior art, a charging control circuit and a charging power supply device of the present invention are provided.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
according to an aspect of the present invention, there is provided a charge control circuit including a voltage conversion circuit, a sampling resistor, an amplifying circuit, and a control circuit;
the input end of the voltage conversion circuit is connected with a charging power supply, and the voltage of the charging power supply is converted and then output to equipment to be charged through an output end;
the sampling resistor is connected in series with the output end of the voltage conversion circuit;
the amplifying circuit is connected with two ends of the sampling resistor, the output end of the amplifying circuit is connected with the control circuit, the amplifying circuit collects the voltage drop on the sampling resistor, amplifies the voltage drop and outputs the amplified voltage drop to the control circuit;
the control end of the control circuit is connected with the enabling end of the voltage conversion circuit so as to close the voltage conversion circuit when the amplified voltage drop is not larger than a preset value.
Optionally, the charging control circuit further includes a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, where the first capacitor and the second capacitor are connected in parallel between the input end of the voltage conversion circuit and ground, and the third capacitor and the fourth capacitor are connected in parallel between the output end of the voltage conversion circuit and ground; the first capacitor and the second capacitor have different capacitance values, and the third capacitor and the fourth capacitor have different capacitance values.
Optionally, the voltage conversion circuit comprises a DC-DC boost chip, an inductor, a first resistor, a second resistor and a third resistor;
the power input end of the DC-DC boosting chip is connected with the charging power supply, the inductor is connected between the power input end of the DC-DC boosting chip and the input end of the boosting rectifying switch, and the enabling end of the DC-DC boosting chip is connected with the control end of the control circuit and is grounded through a first resistor in a pull-down mode; the output end of the DC-DC boosting chip is grounded by a second resistor and a third resistor which are connected in series, and the feedback end of the DC-DC boosting chip is connected to the connecting end of the second resistor and the third resistor.
Optionally, the sampling resistor is a high-precision resistor with the resistance precision of more than 1%.
Optionally, the charging control circuit further includes a fifth capacitor and a sixth capacitor, where the fifth capacitor and the sixth capacitor are connected in parallel between the connection end of the sampling resistor and the voltage conversion circuit and ground, and the capacitance values of the fifth capacitor and the sixth capacitor are different.
Optionally, the amplifying circuit includes an amplifying chip and a fifth resistor; the two input ends of the amplifying chip are respectively connected with the two ends of the sampling resistor, and the output end of the amplifying chip is the output end of the amplifying circuit; the fifth resistor is connected between the output end of the amplifying chip and the ground.
Optionally, the amplifying chip is an INA216 chip, and the voltage drop amplifying factor is 25, 50, 100 or 200.
Optionally, the amplifying circuit includes a seventh capacitor, and the seventh capacitor is connected between the output end of the amplifying circuit and ground.
Optionally, the amplifying circuit further comprises a sixth resistor, and the sixth resistor is connected in series between the output end of the amplifying circuit and the control circuit.
According to another aspect of the present invention, there is provided a charging power supply apparatus provided therein with the charge control circuit as set forth in any one of the above.
In summary, the beneficial effects of the invention are as follows:
the sampling resistor and the amplifying circuit are arranged in the charging circuit, the voltage drop at two ends of the sampling resistor is obtained by the amplifying circuit and amplified, then the amplified voltage drop is received by the control circuit as a detection value to control the charging stop, and the problem that the charging current is originally too small to cause undetectable use is solved, so that the effect of controlling the charging stop under the state of smaller charging current which cannot be achieved by current detection is achieved, the electric equipment is fully charged as much as possible, and the cruising ability is improved.
Drawings
Fig. 1 is a schematic diagram of a charge control circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit connection diagram of a charge control circuit according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
The technical conception of the invention is as follows: the charging circuit is provided with the sampling resistor and the amplifying circuit, the sampling resistor is connected in series on the charging circuit, the amplifying circuit collects voltage drops at two ends of the sampling resistor and amplifies the voltage drops, the control circuit receives the amplified voltage drops as detection values to control the charging to stop, the problem that the charging current is originally too small to cause undetectable use is solved, the effect of controlling the charging to stop in a smaller charging current state is achieved, the electric equipment is fully charged as much as possible, and the cruising ability is improved.
Fig. 1 schematically shows a schematic configuration of a charge control circuit of the present invention, and as shown in fig. 1, a charge control circuit includes a voltage conversion circuit 110, a sampling resistor 120, an amplifying circuit 130, and a control circuit 130.
The input end of the voltage conversion circuit 110 is connected with a charging power supply, and the voltage of the charging power supply is converted and then output to the equipment to be charged through the output end.
The sampling resistor 120 is connected in series to the output terminal of the voltage conversion circuit 110. The amplifying circuit 130 is connected to two ends of the sampling resistor 120, an output end of the amplifying circuit 130 is connected to the control circuit 140, the amplifying circuit 130 collects the voltage drop on the sampling resistor 120, amplifies the voltage drop, and outputs the amplified voltage drop to the control circuit 140. In some embodiments of the present invention, the sampling resistor 120 is a high-precision resistor with a precision of more than 1%, so as to accurately collect and detect the charging current and improve the control precision of the charging cut-off current.
The control terminal of the control circuit 140 is connected to the enable terminal of the voltage conversion circuit 110 to turn off the voltage conversion circuit 110 when the amplified voltage drop is not greater than a preset value. Since the charging current decreases with increasing charging level, when the control circuit 140 determines that the amplified voltage drop is not greater than the preset value, it is known that the charging current has reached a sufficiently small level and the charging has reached a sufficiently full level, so that the control circuit 140 turns off the voltage conversion circuit 110 to stop charging. The control circuit 140 may be implemented by an electronic component such as a voltage comparator, or the control circuit 140 may also be implemented by an MCU controller, in which case, the amplified voltage drop signal is output to an analog-to-digital conversion sampling end of the MCU controller, as shown in the circuit connection diagram of fig. 2.
Because the charging control circuit embodiment does not directly detect the charging current, but acquires and amplifies the voltage drop of the sampling resistor 120 through the amplifying circuit 130, and sends the voltage drop as a detection value to the control circuit 140, the problem that the original charging current is too small to detect is solved by means of acquisition and amplification of the voltage drop, so that the charging process can be stopped under the smaller charging current, portable equipment such as headphones can be fully charged as much as possible, and the cruising ability of the portable equipment is improved. Compared with a current detection circuit built by a resistor, the charging control with higher precision can be realized by matching the amplifying circuit 130 and the sampling resistor 120, the charging degree of electric equipment is improved, and the cruising ability is improved.
Fig. 2 is a schematic circuit connection diagram of a charge control circuit according to an embodiment of the present invention, wherein a sampling resistor 120 is a resistor R4, an amplifying circuit 130 includes an amplifying chip U6 and a peripheral resistor-capacitor, and two input terminals in+ and IN-of the amplifying chip U6 are respectively connected to two ends of the sampling resistor R4.
As shown in fig. 2, the charge control circuit further includes a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4, where the first capacitor C1 and the second capacitor C2 are connected in parallel between the input terminal of the voltage conversion circuit 110 and ground, and the third capacitor C3 and the fourth capacitor C4 are connected in parallel between the output terminal of the voltage conversion circuit 110 and ground. The capacitance values of the first capacitor C1 and the second capacitor C2 are different, and the capacitance values of the third capacitor C3 and the fourth capacitor C4 are different, so that interference signals with different frequencies can be filtered respectively, and stability of an input power supply and stability of an output power supply are improved.
The voltage conversion circuit 110 includes a DC-DC boost chip U4, an inductance L1, a first resistor R1, a second resistor R2, and a third resistor R3.
The power input end VBAT of the DC-DC boost chip U4 is connected with a charging power supply, and the inductor L1 is connected between the power input end VBAT of the DC-DC boost chip U4 and the boost rectifying switch input end SW. The enable terminal EN of the DC-DC boost chip U4 is connected to the control terminal uc_en of the control circuit 140 and is grounded via the first resistor pull-down R1. The output end VOUT of the DC-DC boosting chip is grounded through a second resistor R2 and a third resistor R3 which are connected in series, and the feedback end FB of the DC-DC boosting chip U4 is connected to the connecting end of the second resistor R2 and the third resistor R3.
The enabling end of the DC-DC boosting chip U4 is grounded through the first resistor R1 in a pull-down mode, so that the voltage is prevented from being touched by mistake due to voltage jitter when the control end UC_EN outputs no signal and is pulled down to a stable low level.
In the circuit shown in fig. 2, the DC-DC boost chip is the TPS61070 chip. TPS61070 is a synchronous boost converter with 90% high efficiency, which works normally when the enable EN is high, providing an output voltage of up to 5.5V. As shown in fig. 2, the output voltage is adjusted by a resistor divider formed by the second resistor R2 and the third resistor R3, and in some embodiments of the present invention, the second resistor R2 and the third resistor R3 each use a high-precision resistor with a precision of more than 1% to improve the precision of the output voltage adjustment.
As shown in the circuit connection diagram of fig. 2, the charge control circuit further includes a fifth capacitor C5 and a sixth capacitor C6, where the fifth capacitor C5 and the sixth capacitor C6 are connected in parallel between the connection end of the sampling resistor R4 and the voltage conversion circuit 110 and ground, and the capacitance values of the fifth capacitor C5 and the sixth capacitor C6 are different to filter ripple interference with different frequencies, so as to further improve the stability of the output voltage.
In some embodiments of the present invention, the amplifying circuit 130 includes an amplifying chip U6 and a fifth resistor R5, two input ends of the amplifying chip U6 are respectively connected to two ends of the sampling resistor R4, and an output end OUT of the amplifying chip U6 is an output end of the amplifying circuit 130; the fifth resistor R5 is connected between the output terminal OUT of the amplifying chip U6 and ground, and when no charging current is supplied for detection, the fifth resistor R5 pulls down the output terminal OUT of the amplifying circuit U6 to a stable low level, so as to avoid outputting an interference signal to the control circuit 140.
In some embodiments of the invention, the amplifying chip U6 is an INA216 chip with a voltage drop amplification of 25, 50, 100 or 200. In the circuit connection schematic diagram shown in fig. 2, the circuit charges the bluetooth headset, the sampling resistor R4 is a high-precision resistor with a resistance value of 200m ohms and a precision of 1%, and the voltage drop amplification factor of the amplifying chip U6 is 25. Of course, according to different charging requirements, the resistance value of the sampling resistor R4 and the voltage drop amplification factor of the amplifying chip U6 can be adaptively adjusted so as to adapt to the requirements of different electric equipment such as Bluetooth headphones and smart phones.
In some embodiments of the present invention, the amplifying circuit 130 further includes a seventh capacitor C7, where the seventh capacitor C7 is connected between the output terminal of the amplifying circuit 130 and the ground, that is, between the output terminal OUT of the amplifying chip U6 and the ground, for filtering OUT ripple shock, so as to prevent the suddenly generated voltage drop signal from causing voltage shock to the input terminal of the control circuit 140, such as the analog-to-digital sampling terminal of the MCU, when charging starts, and avoid damaging the MCU.
In some embodiments of the present invention, the amplifying circuit 130 further includes a sixth resistor R6, where the sixth resistor R6 is connected in series between the output end of the amplifying circuit and the control circuit 140, that is, between the output end OUT of the amplifying chip U6 and the control circuit 140, so as to limit current, and prevent the amplified voltage from being excessively high, resulting in excessive current and damaging the MCU.
Referring to fig. 2, the working principle of the circuit is specifically described as follows:
the charging power supply VBAT is a battery power supply of 3.3V to 4.2V, charges equipment to be charged after boosting through U4, synchronously detects the magnitude of charging current by utilizing R4 and U6 on a VHS+ line, and controls the opening and closing of U4 according to the magnitude of a detection result.
During normal charging, the charging current is larger, the detection value is larger than a preset value, at this moment, the MCU enables (i.e. pulls up the level) the 3 feet of U4 through the control end UC_EN, the charging power supply VBAT is input to the 6 feet VBAT of the power supply input foot of U4 after filtering of C1 and C2, and therefore the 5 feet of the output foot of U4 can output, and the specific output voltage is 4.81V. The output voltage is filtered by the capacitors C3, C4, C5 and C6, and is output to the equipment to be charged after passing through the sampling resistor R4. The input pins 1 and 3 of the U6 collect voltages at two ends of the R4 in real time, the collected voltages are amplified by 25 times internally, and the amplified voltages are output to the ADC pins of the MCU to be used for the MCU to collect the voltages in real time. The MCU converts the acquired analog signals into digital signals and compares the digital signals with a preset value, so that whether the charging current is already low to a preset level or not is determined, namely whether the charging is complete or not. Specifically, through a simple ohm law conversion relation, the collected voltage can be used to convert the current flowing through R4, for example, the ICE_SENSE voltage detected by an ADC pin of the MCU is 0.5V, and the charging current obtained after conversion is: (0.5V/25)/0.2Ω=0.1a=100 mA. In practice, in order to simplify the calculation process, a voltage preset value converted from the off-current may be preset in the MCU, so as to directly compare with the acquired voltage value. For example, in order to fully charge the earphone as much as possible, a smaller charge cut-off current is set, such as 5mA, because 5mA is equal to 200mΩ is equal to 25=25 mV, as long as the voltage fed back by ICE SENSE is detected to reach 25mV or less, the enabling pin 3 of U4 is pulled down (not enabled) through uc_en, so that U4 stops boosting charging, thereby achieving the design purpose of controlling the cut-off of charging when 5mA current is cut off.
The invention also discloses a charging power supply device, which is provided with the charging control circuit, so that the charging process can be controlled more accurately, the charging is stopped under smaller charging current, the charging quantity is improved, and the charging power supply device can be a power supply adapter, a charging device and the like.
The foregoing is merely a specific embodiment of the invention and other modifications and variations can be made by those skilled in the art in light of the above teachings. It is to be understood by persons skilled in the art that the foregoing detailed description is provided for the purpose of illustrating the invention more fully, and that the scope of the invention is defined by the appended claims.
Claims (8)
1. The charging control circuit is characterized by comprising a voltage conversion circuit, a sampling resistor, an amplifying circuit and a control circuit;
the input end of the voltage conversion circuit is connected with a charging power supply, and the voltage of the charging power supply is converted and then output to equipment to be charged through an output end;
the sampling resistor is connected in series with the output end of the voltage conversion circuit;
the amplifying circuit is connected with two ends of the sampling resistor, the output end of the amplifying circuit is connected with the control circuit, the amplifying circuit collects the voltage drop on the sampling resistor, amplifies the voltage drop and outputs the amplified voltage drop to the control circuit;
the control end of the control circuit is connected with the enabling end of the voltage conversion circuit so as to close the voltage conversion circuit when the amplified voltage drop is not greater than a preset value;
the charging control circuit further comprises a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, wherein the first capacitor and the second capacitor are connected in parallel between the input end of the voltage conversion circuit and the ground, and the third capacitor and the fourth capacitor are connected in parallel between the output end of the voltage conversion circuit and the ground; the capacitance values of the first capacitor and the second capacitor are different, and the capacitance values of the third capacitor and the fourth capacitor are different;
the voltage conversion circuit comprises a DC-DC boost chip, an inductor, a first resistor, a second resistor and a third resistor;
the power input end of the DC-DC boosting chip is connected with the charging power supply, the inductor is connected between the power input end of the DC-DC boosting chip and the input end of the boosting rectifying switch, and the enabling end of the DC-DC boosting chip is connected with the control end of the control circuit and is grounded through a first resistor in a pull-down mode; the output end of the DC-DC boosting chip is grounded by a second resistor and a third resistor which are connected in series, and the feedback end of the DC-DC boosting chip is connected to the connecting end of the second resistor and the third resistor.
2. The charge control circuit according to claim 1, wherein the sampling resistor is a high-precision resistor having a resistance value precision of 1% or more.
3. The charge control circuit of claim 1, further comprising a fifth capacitor and a sixth capacitor connected in parallel between the connection of the sampling resistor and the voltage conversion circuit and ground, the fifth capacitor and the sixth capacitor having different capacitance values.
4. The charge control circuit of claim 1, wherein the amplifying circuit comprises an amplifying chip and a fifth resistor; the two input ends of the amplifying chip are respectively connected with the two ends of the sampling resistor, and the output end of the amplifying chip is the output end of the amplifying circuit; the fifth resistor is connected between the output end of the amplifying chip and the ground.
5. The charge control circuit of claim 4 wherein the amplifying chip is an INA216 chip having a voltage drop amplification of 25, 50, 100 or 200.
6. The charge control circuit of claim 1, wherein the amplifying circuit comprises a seventh capacitor connected between an output of the amplifying circuit and ground.
7. The charge control circuit of claim 1 wherein the amplifying circuit further comprises a sixth resistor connected in series between the output of the amplifying circuit and the control circuit.
8. A charging power supply device, characterized in that the charging power supply device is provided therein with a charging control circuit as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810067904.4A CN108054810B (en) | 2018-01-24 | 2018-01-24 | Charging control circuit and charging power supply equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810067904.4A CN108054810B (en) | 2018-01-24 | 2018-01-24 | Charging control circuit and charging power supply equipment |
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| Publication Number | Publication Date |
|---|---|
| CN108054810A CN108054810A (en) | 2018-05-18 |
| CN108054810B true CN108054810B (en) | 2024-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810067904.4A Active CN108054810B (en) | 2018-01-24 | 2018-01-24 | Charging control circuit and charging power supply equipment |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007020299A (en) * | 2005-07-07 | 2007-01-25 | Matsushita Electric Ind Co Ltd | Charger |
| CN202474986U (en) * | 2012-02-28 | 2012-10-03 | 深圳麦格米特电气股份有限公司 | Charge circuit for lithium-ion battery pack |
| CN207939226U (en) * | 2018-01-24 | 2018-10-02 | 歌尔科技有限公司 | A kind of charging control circuit and a kind of charging power device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103176053A (en) * | 2011-12-23 | 2013-06-26 | 鸿富锦精密工业（深圳）有限公司 | Measuring circuit for capacity and parasitic resistance of capacitor |
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2018
- 2018-01-24 CN CN201810067904.4A patent/CN108054810B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007020299A (en) * | 2005-07-07 | 2007-01-25 | Matsushita Electric Ind Co Ltd | Charger |
| CN202474986U (en) * | 2012-02-28 | 2012-10-03 | 深圳麦格米特电气股份有限公司 | Charge circuit for lithium-ion battery pack |
| CN207939226U (en) * | 2018-01-24 | 2018-10-02 | 歌尔科技有限公司 | A kind of charging control circuit and a kind of charging power device |
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| Publication number | Publication date |
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| CN108054810A (en) | 2018-05-18 |
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