CN111934399A - Charging chip and electronic equipment - Google Patents
Charging chip and electronic equipment Download PDFInfo
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- CN111934399A CN111934399A CN202011000464.4A CN202011000464A CN111934399A CN 111934399 A CN111934399 A CN 111934399A CN 202011000464 A CN202011000464 A CN 202011000464A CN 111934399 A CN111934399 A CN 111934399A
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- charging
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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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
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
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- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a charging chip and an electronic device. The charging chip comprises a charging circuit, a first detection circuit, a control circuit and a second detection circuit. The charging circuit is used for outputting charging current to the battery to charge the battery. The first detection circuit is used for detecting whether the charging current of the charging circuit when the charging circuit charges the battery is smaller than or equal to a preset current value. The control circuit is used for controlling the charging circuit to stop outputting the charging current when the charging current is smaller than or equal to a preset current value. The second detection circuit is used for detecting whether the first voltage value of the battery is smaller than a first preset voltage value or not when the charging circuit stops outputting the charging current. When the first voltage value of the battery is smaller than the first preset voltage value, the control circuit is used for controlling the charging circuit to recover and output the charging current, and the battery is continuously charged. The charging chip of this application can promote the electric energy of the storage of battery.
Description
Technical Field
The invention relates to the technical field of quick charging, in particular to a charging chip and electronic equipment.
Background
Electronic devices such as mobile phones generally include a battery for supplying power to functional components in the electronic device. The battery needs a charging chip to charge the battery. In the related art, when the charging chip charges the battery, the charging chip judges whether the battery is fully charged or not accurately, and then the battery is not sufficiently stored during charging.
Disclosure of Invention
In one aspect, the present application provides a charging chip, the charging chip includes:
a charging circuit for outputting a charging current to a battery to charge the battery;
the first detection circuit is used for detecting whether the charging current of the charging circuit when the charging circuit charges the battery is smaller than or equal to a preset current value;
the control circuit is used for controlling the charging circuit to stop outputting the charging current when the charging current is smaller than or equal to a preset current value; and
the second detection circuit is used for detecting whether the first voltage value of the battery is smaller than a first preset voltage value or not when the charging circuit stops outputting the charging current;
when the first voltage value of the battery is smaller than the first preset voltage value, the control circuit is used for controlling the charging circuit to recover to output the charging current and continue to charge the battery.
When the charging circuit stops outputting the charging current and the first voltage value of the battery is greater than or equal to the first preset voltage value, the control circuit controls the charging circuit not to continue charging the battery.
Wherein, the chip that charges still includes:
the third detection circuit is used for detecting whether a second voltage value when the charging circuit charges the battery is larger than or equal to a second preset voltage value or not;
when the charging current is smaller than or equal to a preset current value and the second voltage value is larger than or equal to the second preset voltage value, the control circuit controls the charging circuit to stop outputting the charging current.
Wherein, the chip that charges still includes:
the timing circuit is used for outputting a timing signal every preset time;
when the charging current is smaller than or equal to a preset current value, the second voltage value is larger than or equal to the second preset voltage value, and the timing circuit outputs the timing signal, the control circuit controls the charging circuit to stop outputting the charging current.
Wherein the first detection circuit comprises:
one end of the first resistor is electrically connected with the output end of the charging circuit, and the other end of the first resistor is electrically connected with a battery to detect the charging current value; and
and the negative input end of the first comparator is electrically connected with the first resistor, and the positive input end of the first comparator is used for receiving the preset current value.
Wherein the first detection circuit further comprises:
the positive input end of the operational amplifier is electrically connected with one end of the first resistor, which is electrically connected with one end of the charging circuit, the negative input end of the operational amplifier is electrically connected with the other end of the first resistor, and the operational amplifier is used for amplifying the charging current by a preset multiple.
Wherein the first detection circuit further comprises:
one end of the second resistor is electrically connected with the output end of the operational amplifier, and the other end of the second resistor is grounded so as to obtain a charging voltage according to the charging current;
the negative input end of the first comparator is electrically connected to a node where the operational amplifier is electrically connected to the second resistor, and the positive input end of the first comparator is used for receiving the preset voltage value.
Wherein the second detection circuit comprises:
a positive input terminal of the second comparator is configured to be electrically connected to the battery to receive the first voltage value, and a negative input terminal of the second comparator is configured to receive the first preset voltage value.
Wherein the third detection circuit comprises:
a positive input terminal of the third comparator is configured to be electrically connected to the battery to receive the second voltage value, and a negative input terminal of the third comparator is configured to receive the second preset voltage value.
Wherein the control circuit comprises:
the two input ends of the first AND gate are respectively and electrically connected with the output ends of the first comparator and the third comparator;
the two input ends of the second AND gate are respectively and electrically connected with the output end of the first AND gate and the timing circuit; and
and two input ends of the third AND gate are respectively and electrically connected with the output end of the second AND gate and the output end of the second comparator.
The timing circuit is used for outputting a high-level timing signal after a preset time interval.
When the charging current value is smaller than or equal to the preset current value, the preset time of the interval of the timing circuit outputting the timing signal is gradually reduced.
When the control circuit controls the charging circuit not to continue charging the battery, the control circuit also controls the timing circuit to stop working.
Wherein the charging circuit comprises:
a charging module for outputting a charging current to a battery; and
an indication module for indicating a state of charge of a battery;
when the first voltage value of the battery is larger than or equal to the first preset voltage value, the control circuit controls the charging module not to continue charging the battery, and controls the indicating module to stop working.
In a second aspect, the present application further provides an electronic device, where the electronic device includes a battery and the charging chip according to the first aspect and the second aspect, and the charging chip is electrically connected to the battery and is used for charging the battery.
Compared with the related art, the method has the following beneficial effects. When the first detection circuit detects that the charging current of the battery is smaller than a preset current value, the first detection circuit generally indicates that the battery is fully charged or is about to be fully charged. When the first detection circuit detects that the charging current of the battery is smaller than a preset current value, the control circuit controls the charging circuit to stop outputting the charging current. When the charging circuit stops outputting the charging current, the second detection circuit detects the voltage value of the battery to obtain a first voltage value. And when the first voltage value is larger than or equal to a first preset voltage value, the energy storage of the battery is not enough, namely, the battery is not fully charged, and the control circuit controls the charging circuit to continuously charge the battery. Therefore, the charging chip can improve the stored electric energy of the battery.
Drawings
Fig. 1 is a schematic environment diagram of an electronic device to which a charging chip is applied during charging according to an embodiment of the present disclosure.
Fig. 2 is a schematic diagram of an electronic device according to an embodiment of the present application.
Fig. 3 is a circuit block diagram of a charging chip according to an embodiment of the present disclosure.
Fig. 4 is a circuit block diagram of a charging chip according to another embodiment of the present application.
Fig. 5 is a circuit block diagram of a charging chip according to another embodiment of the present application.
Fig. 6 is a circuit diagram of the charging chip provided in fig. 5 according to an embodiment of the present disclosure.
Fig. 7 is a circuit block diagram of a charging chip according to still another embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without inventive step, are within the scope of the present disclosure.
Reference herein to "an embodiment" or "an implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment or implementation can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The application provides a charging chip 100, wherein the charging chip 100 is applied to an electronic device 1 and is used for charging a battery 200 in the electronic device 1. The electronic device 1 may be, but not limited to, an electronic device 1 having a rechargeable battery 200, such as a mobile phone, an internet device (MID), an electronic book, a Portable Player Station (PSP), or a Personal Digital Assistant (PDA). Referring to fig. 1 and fig. 2 together, fig. 1 is an environmental schematic diagram of an electronic device applied with a charging chip according to an embodiment of the present disclosure during charging; fig. 2 is a schematic diagram of an electronic device according to an embodiment of the present application. When the battery 200 in the electronic device 1 needs to be charged, the electronic device 1 is connected to an electric power output device 3 such as a power adapter or a portable power source. Taking the power output device as a power adapter as an example for illustration, when the battery 200 in the electronic device 1 needs to be charged, the electronic device 1 is connected to the output end of the power adapter, and the pins of the adapter are plugged into a socket to receive power and convert the power into charging current for output. The charging chip 100 may be, but is not limited to, a fast charging chip, and the so-called fast charging chip refers to the charging chip 100 supporting a fast charging protocol. When the quick charging chip charges the battery 200, the electric time of the battery 200 is short. The fast charge protocol includes, but is not limited to, a USB PD fast charge protocol, an FCP fast charge protocol, an SCP fast charge protocol, a VOOC fast charge protocol, a QC3.0 fast charge protocol, a QC4.0 fast charge protocol, an AFC fast charge protocol, an SFCP fast charge protocol, or a PE fast charge protocol. The battery 200 may be, but is not limited to, a lithium battery. The electronic device 1 further comprises one or more functional components 300, wherein the functional components 300 are electrically connected with the battery 200, and are used for receiving the electric energy of the battery 200 and executing corresponding functions. The functional component 300 may be, but not limited to, a circuit board, a display screen, a speaker, a microphone, etc., and it is understood that the description of the charging environment in the electronic device 1 and the functional component 300 in the electronic device 1 are only for illustration and should not be understood as a limitation to the charging chip 100 of the present application.
To facilitate an understanding of the present application, the technology related to the present application is described below. In the related art, the charging chip 100 detects whether a charging current when charging the battery 200 is less than or equal to a preset current value, and when the charging current is less than or equal to the preset current value, it is determined that the battery 200 is fully charged, and the battery 200 is stopped from being continuously charged. However, the accuracy in determining whether the battery 200 is fully charged using the charging current is not high. Specifically, the battery 200 has an internal resistance, and the battery 200 has a charging current during charging due to the internal resistance, so that the voltage of the battery 200 during charging is higher than the actual voltage of the battery 200 after the charging is stopped. Generally, the total voltage of the battery 200 is equal to the energy storage voltage of the battery 200 plus the voltage on the internal resistance of the battery 200 when charging. When the total voltage of the battery 200 is constant during charging, the higher the internal resistance of the battery 200 is, the lower the energy storage voltage of the battery 200 is. The energy storage voltage of the battery 200 is the voltage after the battery 200 stops charging. The lower the voltage after the battery 200 stops charging indicates that the energy storage utilization rate of the battery 200 is low.
Referring to fig. 3, fig. 3 is a circuit block diagram of a charging chip according to an embodiment of the present disclosure. The present application provides that the charging chip 100 includes: a charging circuit 110, a first detection circuit 120, a control circuit 130, and a second detection circuit 140. The charging circuit 110 is configured to output a charging current to the battery 200 to charge the battery 200. The first detection circuit 120 is configured to detect whether a charging current of the charging circuit 110 when charging the battery 200 is less than or equal to a preset current value. The control circuit 130 is configured to control the charging circuit 110 to stop outputting the charging current when the charging current is less than or equal to a preset current value. The second detection circuit 140 is configured to detect whether the first voltage value of the battery 200 is smaller than a first preset voltage value when the charging circuit 110 stops outputting the charging current. When the first voltage value of the battery 200 is smaller than the first preset voltage value, the control circuit 130 is configured to control the charging circuit 110 to resume outputting the charging current, and continue charging the battery 200.
When the first detection circuit 120 detects that the charging current of the battery 200 is smaller than a preset current value, it generally indicates that the battery 200 is fully charged or is about to be fully charged. When the first detection circuit 120 detects that the charging current of the battery 200 is smaller than a preset current value, the control circuit 130 controls the charging circuit 110 to stop outputting the charging current. When the charging circuit 110 stops outputting the charging current, the second detection circuit 140 detects the voltage value of the battery 200 to obtain a first voltage value. When the first voltage value is greater than or equal to a first preset voltage value, it indicates that the energy storage of the battery 200 is insufficient, that is, the battery 200 is not fully charged, the control circuit 130 controls the charging circuit 110 to recover the charging current and continue to charge the battery 200. Therefore, the charging chip 100 of the present application can boost the stored electric energy of the battery 200, and will not be affected by the resistance of the battery 200 during charging.
For convenience of description, when the first voltage value is greater than or equal to a first preset voltage value, the control circuit 130 controls the charging circuit 110 to recover the charging current to be recorded as I1(ii) a When the charging current is smaller than or equal to a preset current value, the charging current which is stopped to be output by the charging circuit is recorded as I0In one embodiment, I1 =I0Thereby, the control strategy can be simplified. Understandably, I1 =I0The control circuit 130 controls the charging circuit 110 to recover the current at the moment when the charging current is equal to or less than a preset current value, and the charging circuit stops outputting the charging current at the moment when the charging current is less than or equal to the preset current value. After the control circuit 130 controls the charging circuit 110 to recover the charging current, the recovered charging current gradually decreases as the stored electric energy in the battery 200 increases.
In another implementationIn the mode I1＞ I0Thus, the speed at which the battery 200 is fully charged can be increased, that is, the time at which the battery 200 is fully charged can be shortened. Understandably, I1＞ I0The control circuit 130 controls the charging circuit to stop outputting the charging current at the moment when the charging circuit 110 recovers is larger than or equal to a preset current value. After the control circuit 130 controls the charging circuit 110 to recover the charging current, the recovered charging current gradually decreases as the energy stored in the battery 200 increases.
For batteries 200 with different capacities, the preset current value is different, and the value of the preset current value is related to the capacity of the battery 200. Likewise, the value of the first preset voltage is also related to the capacity of the battery 200. For example, for a battery 200 having a capacity of 1 ten thousand milliamperes (mA), the preset current value may be, but is not limited to, 250 milliamperes (mA), and the first preset voltage may be, but is not limited to, 4.175 volts (V) ± 25 millivolts (mV).
Further, when the charging circuit 110 stops outputting the charging current and the first voltage value of the battery 200 is greater than or equal to the first preset voltage value, the control circuit 130 controls the charging circuit 110 not to continue charging the battery 200.
When the charging circuit 110 stops outputting the charging current and the first voltage value of the battery 200 is greater than or equal to the first preset voltage value, it is determined that the battery 200 is fully charged, and the control circuit 130 controls the charging circuit 110 to stop charging the battery 200. In an embodiment, the control circuit 130 controls the charging circuit 110 to no longer continue charging the battery 200 by taking the measure of turning off the charging circuit 110. In other embodiments, the control circuit 130 controls the charging circuit 110 to stop charging the battery 200 by controlling the charging current output by the charging circuit 110 to be zero.
Referring to fig. 4, fig. 4 is a circuit block diagram of a charging chip according to another embodiment of the present disclosure. The charging chip 100 in the present embodiment includes a charging circuit 110, a first detection circuit 120, a control circuit 130, a second detection circuit 140, and a third detection circuit 150. The charging circuit 110, the first detection circuit 120, the control circuit 130, and the second detection circuit 140 refer to the foregoing description, and are not repeated herein. The third detecting circuit 150 is configured to detect whether the second voltage value when the charging circuit 110 charges the battery 200 is greater than or equal to a second preset voltage value. When the charging current is less than or equal to a preset current value and the second voltage value is greater than or equal to the second preset voltage value, the control circuit 130 controls the charging circuit 110 to stop outputting the charging current.
In this embodiment, the third detection circuit 150 detects whether the second voltage value when the charging circuit 110 charges the battery 200 is greater than or equal to a second preset voltage value. Since the second voltage value is a voltage value when the charging circuit 110 charges the battery 200, the second voltage value is generally larger than the first voltage value. When the second voltage value is greater than or equal to a second preset voltage value, it may be considered that the stored electric energy of the battery 200 is more. The control circuit 130 in the charging chip 100 of the application only controls when the charging current is greater than or equal to the preset current value and the second voltage value when charging the battery 200 is greater than or equal to the second preset voltage value the charging circuit 110 stops outputting the charging current, thereby improving the accuracy of judging whether the battery 200 is fully charged or not, and further improving the accuracy of controlling when the charging chip 100 charges the battery 200.
Referring to fig. 5, fig. 5 is a circuit block diagram of a charging chip according to another embodiment of the present disclosure. The charging chip 100 in the present embodiment includes a charging circuit 110, a first detection circuit 120, a control circuit 130, a second detection circuit 140, a third detection circuit 150, and a timer circuit 160. The timing circuit 160 is configured to output a timing signal every interval of a preset time. When the charging current is less than or equal to a preset current value, the second voltage value is greater than or equal to the second preset voltage value, and the timing circuit 160 outputs the timing signal, the control circuit 130 controls the charging circuit 110 to stop outputting the charging current.
Please refer to the foregoing description for the charging circuit 110, the first detecting circuit 120, the control circuit 130, the second detecting circuit 140, and the third detecting circuit 150, which is not described herein again. In the present embodiment, the preset time may be a fixed value or may vary with the change in the length of time for which the battery 200 is charged. In one embodiment, the preset time may be, but is not limited to, 5 minutes. The timing circuit 160 may be, but is not limited to, a positive timing circuit or a negative timing circuit. The timing circuit 160 may be in the form of, but is not limited to, a timer.
In this embodiment, the control circuit 130 controls the charging circuit 110 to stop outputting the charging current under three precondition, one of which is that the charging current is smaller than or equal to a preset current value, the other one is that the second voltage value is greater than or equal to the second preset voltage value, and the other one is when the timing circuit 160 outputs the timing signal. When these three conditions are satisfied, the control circuit 130 controls the charging circuit 110 to stop outputting the charging current. As long as any one of the conditions is not satisfied, the charging circuit 110 continues to output a charging current to charge the battery 200. Therefore, the charging chip 100 in this embodiment can further improve the accuracy of determining whether the battery 200 is fully charged, and further improve the accuracy of controlling the charging chip 100 to charge the battery 200.
Referring to fig. 6, fig. 6 is a circuit diagram of the charging chip provided in fig. 5 according to an embodiment of the present disclosure. The first detection circuit 120 includes: a first resistor R1 and a first comparator 121. One end of the first resistor R1 is electrically connected to the output end of the charging circuit 110, and the other end is electrically connected to the battery 200 to detect the charging current value. The negative input end of the first comparator 121 is electrically connected to the first resistor R1, and the positive input end of the first comparator 121 is configured to receive the preset current value.
In the present embodiment, since the first resistor R1 is provided in the first detection circuit 120, one end of the first resistor R1 is electrically connected to the output terminal of the charging circuit 110, and the other end of the first resistor R1 is electrically connected to the battery 200, the first resistor R1 is connected in series with the battery 200. Since the first resistor R1 is connected in series with the battery 200, the current flowing through the first resistor R1 is the same as the charging current value of the battery 200, and thus the detected current value of the battery 200 during charging can be obtained by detecting the current value of the first resistor R1.
Further, in this embodiment, the first detection circuit 120 further includes: an operational amplifier 122. The positive input end of the operational amplifier 122 is electrically connected to the first resistor R1 and one end of the charging circuit 110, the negative input end of the operational amplifier 122 is electrically connected to the other end of the first resistor R1, and the operational amplifier 122 is configured to amplify the charging current by a predetermined multiple.
The amplifier is used for amplifying the charging current by a preset multiple, and the amplified charging current value is larger in value, so that the judgment according to the amplified charging current value is facilitated, and the accuracy of the charging chip 100 in charging the battery 200 is improved.
Further, in this embodiment, the first detection circuit 120 further includes: and a second resistor R2. One end of the second resistor R2 is electrically connected to the output end of the operational amplifier 122, and the other end of the second resistor R2 is grounded, so as to obtain a charging voltage according to the charging current. The negative input terminal of the first comparator 121 is electrically connected to the node where the operational amplifier 122 is electrically connected to the second resistor R2, and the positive input terminal of the first comparator 121 is used for receiving the preset voltage value (Vref 1).
In the present embodiment, the amplified detection current is applied through the second resistor R2 to obtain a charging voltage value, which is positively correlated with the charging current value. The negative input end of the first comparator 121 is electrically connected to a node where the operational amplifier 122 is electrically connected to the second resistor R2 for receiving the charging voltage value of the charging voltage, and the positive input end of the first comparator 121 is configured to receive the preset voltage value, wherein the preset voltage value is positively correlated to the preset current value. The first comparator 121 is configured to compare the charging voltage value with the preset voltage value. As can be appreciated, since the charging voltage value and the charging current value are positively correlated, and the preset voltage value and the preset current value are positively correlated, the comparison result of the charging voltage value and the preset voltage value is equal to the comparison result of the charging current value and the preset current value. Specifically, when the charging voltage value is greater than or equal to the preset voltage value, the charging current value is greater than or equal to the preset current value; correspondingly, when the charging voltage value is smaller than the preset voltage value, the charging current value is smaller than the preset current value.
Further, in the present embodiment, the second detection circuit 140 includes a second comparator 141. The positive input terminal of the second comparator 141 is used for electrically connecting the battery 200 to receive the first voltage value, and the negative input terminal of the second comparator 141 is used for receiving the first preset voltage value (Vref 2).
When the first voltage value is greater than or equal to the first preset voltage value, the output end of the second comparator 141 outputs a high level signal, i.e., "1"; when the first voltage value is smaller than the first preset voltage value, the output terminal of the second comparator 141 outputs a low level signal, i.e., "0".
It is understood that the second detection circuit 140 including the second comparator 141 is only one form of the second detection circuit 140, and the second detection circuit 140 may have other forms as long as the first voltage value and the first preset voltage value can be compared.
Further, in the present embodiment, the third detection circuit 150 includes a third comparator 151. The positive input terminal of the third comparator 151 is configured to be electrically connected to the battery 200 to receive the second voltage value, and the negative input terminal of the third comparator 151 is configured to receive the second preset voltage value.
When the second voltage value is greater than or equal to the second preset voltage value, the output end of the third comparator 151 outputs a high level signal, that is, a logic 1; when the second voltage value is smaller than the second preset voltage value, the output terminal of the second comparator 141 outputs a low level signal, i.e., a logic 0.
It is understood that the third detection circuit 150 including the third comparator 151 is only one form of the third detection circuit 150, and the third detection circuit 150 may have other forms as long as the second voltage value can be compared with the second preset voltage value.
Further, in the present embodiment, the control circuit 130 includes a first AND gate 131 (AND gate), a second AND gate 132, AND a third AND gate 133. Two input ends of the first and gate 131 are electrically connected to the output ends of the first comparator 121 and the third comparator 151, respectively. Two input ends of the second and gate 132 are electrically connected to the output end of the first and gate 131 and the timing circuit 160, respectively. Two input ends of the third and gate 133 are electrically connected to an output end of the second and gate 132 and an output end of the second comparator 141, respectively.
The and gate is also called an and circuit, a logical product, and a logical and circuit. Is the basic logic gate that performs the and operation. There are two or more inputs, one output. The output is high when all inputs are high (logic 1) at the same time, and low (logic 0) otherwise. In this embodiment, the first and gate 131, the second and gate 132, and the third and gate 133 each include two input terminals.
Further, the timing circuit 160 is configured to output a high-level timing signal after a preset time interval. Accordingly, the timer outputs a low level signal within the preset time. In this embodiment, the preset time is equal, in other words, within the preset time, the timing circuit 160 outputs a low level, and outputs a high level after the preset time. For example, the preset time is 5 minutes, within 5 minutes, the timer circuit 160 outputs a low level, and at the time of 5 minutes, outputs a high level.
The operation principle of the charging chip 100 provided in the present application is described below with reference to fig. 6. When the charging voltage value received by the first comparator 121 is less than or equal to the preset voltage value (the corresponding charging current value is less than or equal to the preset current value), the first comparator 121 outputs a high level (i.e. a logic 1), and within the preset time, the timing circuit 160 outputs a low level (logic 0) signal, then, the second and gate 132 outputs a low level signal, and the low level signal output by the second and gate 132 triggers the charging circuit 110 to stop outputting the charging current. When the charging circuit 110 stops outputting the charging current, the second comparator 141 detects the voltage of the battery 200 to obtain a first voltage value, when the first voltage value is smaller than the first preset voltage value, the second comparator 141 outputs a low level, the third and gate 133 receives the low level output by the second comparator 141, the third and gate 133 outputs a low level, and the charging circuit 110 continues to charge the battery 200.
When the charging voltage value received by the first comparator 121 is less than or equal to the preset voltage value (the corresponding charging current value is less than or equal to the preset current value), the first comparator 121 outputs a high level (i.e., logic 1); when the second voltage value received by the third comparator 151 is greater than or equal to the second preset voltage value, the third comparator 151 outputs a high level; since the two input terminals of the first and gate 131 are respectively connected to the output terminal of the first comparator 121 and the output terminal of the third comparator 151, the first and gate 131 outputs a high level; when the timer outputs a high-level timing signal, because the two input ends of the second and gate 132 are respectively connected to the output end of the first and gate 131 and the timer, the output end of the second and gate 132 outputs a high-level signal; when the second and gate 132 outputs a high level, it triggers the charging circuit 110 to reduce the charging current to zero. Since the charging current decreases to zero, the second comparator 141 compares the magnitude relationship between the first voltage value and the first preset voltage value. When the first voltage value is greater than or equal to the first preset voltage value, the second comparator 141 outputs a high level; since the two input terminals of the third and gate 133 are respectively connected to the output terminal of the second and gate 132 and the output terminal of the second comparator 141, and the output terminal of the second and gate 132 outputs a high level and the second comparator 141 outputs a high level, the output terminal of the third and gate 133 outputs a high level. When the output of the third and gate 133 outputs a high level, the charging circuit 110 is triggered to stop charging the battery 200.
In one embodiment, when the charging current value is less than or equal to the preset current value, the preset time of the interval of the timing circuit 160 outputting the timing signal gradually decreases.
When the charging circuit 110 is less than or equal to the preset current value, indicating that the battery 200 is fully charged, the preset time of the interval of the timing signal output by the timing circuit 160 is gradually decreased, so as to shorten the time from the completion of the charging of the battery 200 to the detection of the charging by the detection circuit.
In one embodiment, when the control circuit 130 controls the charging circuit 110 to stop charging the battery 200, the control circuit 130 also controls the timing circuit 160 to stop operating.
In this embodiment, when the control circuit 130 controls the charging circuit 110 to stop charging the battery 200, the control circuit 130 controls the timing circuit 160 to stop operating, so as to reduce the power consumption of the charging circuit 110.
Referring to fig. 7, fig. 7 is a circuit block diagram of a charging chip according to still another embodiment of the present disclosure. The charging circuit 110 includes a charging module 111 and an indication module 112. The charging module 111 is used for outputting a charging current to the battery 200. The indication module 112 is used for indicating the charging state of the battery 200. When the first voltage value of the battery 200 is greater than or equal to the first preset voltage value, the control circuit 130 controls the charging module 111 not to continue charging the battery 200, and controls the indicating module 112 to stop working.
In this embodiment, when the first voltage value of the battery 200 is greater than or equal to the first preset voltage value, the control circuit 130 controls the charging module 111 to stop charging the battery 200 and controls the indicating module 112 to stop working, so that the indicating module 112 does not consume electric energy. The charging circuit 110 including the charging module 111 and the indication module 112 may be incorporated into the charging chip 100 according to any of the foregoing embodiments, and in the schematic diagram of the present embodiment, the charging circuit 110 including the charging module 111 and the indication module 112 is incorporated into the charging chip 100 shown in fig. 6 as an example.
In an embodiment of the charging chip 100 provided in combination with the above embodiments, when the charging circuit 110 is smaller than or equal to a preset current value, the control circuit 130 further controls the charging voltage output by the charging circuit 110 to be higher than a preset charging voltage, so as to shorten the charging time of the battery 200 with full charge. And the preset charging voltage is the charging voltage when the charging current is greater than or equal to the preset current.
In one embodiment, when the charging circuit 110 in the charging chip 100 starts to charge the battery 200, the first detection circuit 120 in the charging chip 100 is activated. That is, the first detection circuit 120 detects whether the charging current when the charging circuit 110 charges the battery 200 is less than or equal to a preset current value.
In another embodiment, the first detection circuit 120 of the charging chip 100 is operated after the charging circuit 110 of the charging chip 100 charges the battery 200 for a predetermined time. That is, after the charging circuit 110 in the charging chip 100 charges the battery 200 for a preset time, the first detection circuit 120 detects whether the charging current when the charging circuit 110 charges the battery 200 is less than or equal to a preset current value. Within the preset time period from the beginning of charging the battery 200 by the charging circuit 110 in the charging chip 100, the first detection circuit 120 does not detect the charging current of the charging circuit 110 for charging the battery 200.
For example, the preset time period is 5 hours, and the first detection circuit 120 does not detect the charging current of the charging circuit 110 for charging the battery 200 within 5 hours from the charging circuit 110 in the charging chip 100 starting to charge the battery 200. In the case that there is 5 hours after the charging circuit 110 in the charging chip 100 starts to charge the battery 200, the first detection circuit 120 detects the charging current for the charging circuit 110 to charge the battery 200.
It is understood that the preset time period is related to the capacity of the battery 200. Generally, under the condition that the charging strategy of the charging circuit 110 is fixed, the larger the capacity of the battery 200 is, the longer the preset time period is; conversely, under the condition that the charging strategy of the charging circuit 110 is fixed, the smaller the capacity of the battery 200 is, the shorter the preset time period is.
In addition, the preset time period is related to the amount of electricity remaining in the battery 200 before charging. Generally, in a case where the capacity of the battery 200 is fixed and the charging strategy of the charging circuit 110 is fixed, the smaller the amount of electricity left in the battery 200 before charging, the longer the preset time period; conversely, under the condition that the capacity of the battery 200 is fixed and the charging strategy of the charging circuit 110 is fixed, the more the amount of electricity left in the battery 200 before charging is, the shorter the preset time period is.
Since it takes a certain time for the charging circuit 110 to fully charge or substantially fully charge the battery 200, within the preset time period from the beginning of charging the battery 200, the charging circuit 110 in the charging chip 100 generally considers that the battery 200 is not fully charged and the electric energy charged in the battery 200 is not close to being fully charged, then the first detection circuit 120 does not detect the charging current for the charging circuit 110 to charge the battery 200, until the charging circuit 110 charges the battery 200 for the preset time period, the charging circuit 110 charges the battery 200 close to being fully charged, and the first detection circuit 120 does not detect the current for the charging circuit 110 to charge the battery 200. In this embodiment, the reduction of the service life due to frequent detection by the first detection circuit 120 can be avoided.
It should be noted that the above is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept also fall within the protection scope of the present invention.
Claims (15)
1. A charging chip, comprising:
a charging circuit for outputting a charging current to a battery to charge the battery;
the first detection circuit is used for detecting whether the charging current of the charging circuit when the charging circuit charges the battery is smaller than or equal to a preset current value;
the control circuit is used for controlling the charging circuit to stop outputting the charging current when the charging current is smaller than or equal to a preset current value; and
the second detection circuit is used for detecting whether the first voltage value of the battery is smaller than a first preset voltage value or not when the charging circuit stops outputting the charging current;
when the first voltage value of the battery is smaller than the first preset voltage value, the control circuit is used for controlling the charging circuit to recover to output the charging current and continue to charge the battery.
2. The charging chip of claim 1, wherein the control circuit controls the charging circuit to stop charging the battery when the charging circuit stops outputting the charging current and the first voltage value of the battery is greater than or equal to the first predetermined voltage value.
3. The charging chip of claim 1, wherein the charging chip further comprises:
the third detection circuit is used for detecting whether a second voltage value when the charging circuit charges the battery is larger than or equal to a second preset voltage value or not;
when the charging current is smaller than or equal to a preset current value and the second voltage value is larger than or equal to the second preset voltage value, the control circuit controls the charging circuit to stop outputting the charging current.
4. The charging chip of claim 3, wherein the charging chip further comprises:
the timing circuit is used for outputting a timing signal every preset time;
when the charging current is smaller than or equal to a preset current value, the second voltage value is larger than or equal to the second preset voltage value, and the timing circuit outputs the timing signal, the control circuit controls the charging circuit to stop outputting the charging current.
5. The charging chip of claim 4, wherein the first detection circuit comprises:
one end of the first resistor is electrically connected with the output end of the charging circuit, and the other end of the first resistor is electrically connected with a battery to detect the charging current value; and
and the negative input end of the first comparator is electrically connected with the first resistor, and the positive input end of the first comparator is used for receiving the preset current value.
6. The charging chip of claim 5, wherein the first detection circuit further comprises:
the positive input end of the operational amplifier is electrically connected with one end of the first resistor, which is electrically connected with one end of the charging circuit, the negative input end of the operational amplifier is electrically connected with the other end of the first resistor, and the operational amplifier is used for amplifying the charging current by a preset multiple.
7. The charging chip of claim 6, wherein the first detection circuit further comprises:
one end of the second resistor is electrically connected with the output end of the operational amplifier, and the other end of the second resistor is grounded so as to obtain a charging voltage according to the charging current;
the negative input end of the first comparator is electrically connected to a node where the operational amplifier is electrically connected to the second resistor, and the positive input end of the first comparator is used for receiving the preset voltage value.
8. The charging chip of claim 7, wherein the second detection circuit comprises:
a positive input terminal of the second comparator is configured to be electrically connected to the battery to receive the first voltage value, and a negative input terminal of the second comparator is configured to receive the first preset voltage value.
9. The charging chip of claim 8, wherein the third detection circuit comprises:
a positive input terminal of the third comparator is configured to be electrically connected to the battery to receive the second voltage value, and a negative input terminal of the third comparator is configured to receive the second preset voltage value.
10. The charging chip of claim 9, wherein the control circuit comprises:
the two input ends of the first AND gate are respectively and electrically connected with the output ends of the first comparator and the third comparator;
the two input ends of the second AND gate are respectively and electrically connected with the output end of the first AND gate and the timing circuit; and
and two input ends of the third AND gate are respectively and electrically connected with the output end of the second AND gate and the output end of the second comparator.
11. The charging chip of claim 10, wherein the timing circuit is configured to output a high-level timing signal after a preset time interval.
12. The charging chip of claim 11, wherein the preset time of the interval at which the timing circuit outputs the timing signal is gradually decreased when the charging current value is less than or equal to the preset current value.
13. The charging chip of claim 4, wherein the control circuit further controls the timing circuit to stop operating when the control circuit controls the charging circuit to no longer continue charging the battery.
14. The charging chip of claim 4, wherein the charging circuit comprises:
a charging module for outputting a charging current to a battery; and
an indication module for indicating a state of charge of a battery;
when the first voltage value of the battery is larger than or equal to the first preset voltage value, the control circuit controls the charging module not to continue charging the battery, and controls the indicating module to stop working.
15. An electronic device, comprising a battery and the charging chip of any one of claims 1-14, wherein the charging chip is electrically connected to the battery for charging the battery.
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| CN202011000464.4A CN111934399A (en) | 2020-09-22 | 2020-09-22 | Charging chip and electronic equipment |
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| CN202011000464.4A CN111934399A (en) | 2020-09-22 | 2020-09-22 | Charging chip and electronic equipment |
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Application publication date: 20201113 |