CN110676898A

CN110676898A - Device to be charged

Info

Publication number: CN110676898A
Application number: CN201910871539.7A
Authority: CN
Inventors: 薛兵
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-09-16
Filing date: 2019-09-16
Publication date: 2020-01-10
Anticipated expiration: 2039-09-16
Also published as: CN110676898B

Abstract

The application discloses treat battery charging outfit includes: a charging interface; a battery cell; a switch unit comprising: the first end is connected with the battery unit, and the second end is connected with the charging interface; when the switch unit is switched on, the battery unit is charged in a first charging mode through the voltage and the current input by the charging interface; stopping charging the battery unit in the first charging mode when the switching unit is turned off; the driving circuit is connected with the third end of the switch unit and is used for driving the switch unit to be switched on or switched off; the control unit is connected with the driving circuit and used for providing a first driving signal to the driving circuit through a first pin of the driving circuit and controlling the driving circuit to drive the switch unit to be switched on and off; the first pin is used for detecting the input voltage of the charging interface in the second charging mode; the charging power in the first charging mode is larger than that in the second charging mode.

Description

Device to be charged

Technical Field

The disclosure relates to the technical field of charging, in particular to a device to be charged.

Background

To meet the challenge that a device to be charged (e.g., a smart phone, a mobile terminal, or a smart device) is more and more favored by consumers, but the device to be charged has a large power consumption and needs to be charged frequently, and it usually takes several hours to charge the device to be charged by using a low-power general charging scheme.

However, in the conventional rapid charging scheme, the charging reliability is poor, and the phenomenon that the charging is not performed is caused problematically.

The above information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.

Disclosure of Invention

The present disclosure provides a device to be charged, which can improve reliability in charging.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.

According to an aspect of the present disclosure, there is provided an apparatus to be charged, including: a charging interface; a battery cell; a switch unit comprising: the first end is connected with the battery unit, and the second end is connected with the charging interface; when the switch unit is conducted, the battery unit is charged through the voltage and the current input by the charging interface in a first charging mode; stopping charging the battery unit in the first charging mode when the switching unit is turned off; the driving circuit is connected with the third end of the switch unit and is used for driving the switch unit to be switched on or switched off; the control unit is connected with the driving circuit and used for providing a first driving signal to the driving circuit through a first pin of the driving circuit and controlling the driving circuit to drive the switch unit to be switched on and off; the input voltage of the charging interface in the second charging mode is detected through the first pin; wherein the charging power in the first charging mode is greater than the charging power in the second charging mode.

According to an embodiment of the present disclosure, the driving circuit further includes: the driving MOS tube and the first diode; the first pole of the driving MOS tube is connected with the charging interface, the control pole is connected with the control unit through the first pin, and the second pole is connected with the anode of the first diode; the cathode of the first diode is grounded; the control unit provides the first driving signal to the control electrode of the driving MOS tube through the first pin, and controls the driving circuit to drive the switch unit to be switched on and off.

According to an embodiment of the present disclosure, the driving circuit includes: an input circuit for the input voltage; one end of the input circuit is connected with the charging interface, the other end of the input circuit is connected with the control electrode of the driving MOS tube, and the input circuit is connected with the control unit through the first pin; the input voltage is provided to the battery unit through a control electrode of the driving MOS tube so as to charge the battery unit in the second charging mode; the control unit is used for collecting an output signal of the input circuit so as to detect the input voltage in the second charging mode.

According to an embodiment of the present disclosure, the input circuit includes: a first resistor and a second diode; one end of the first resistor is connected with the charging interface, and the other end of the first resistor is connected with the anode of the second diode; and the cathode of the second diode is connected with the control electrode of the driving MOS tube and is connected with the control unit through the first pin.

According to an embodiment of the present disclosure, the control unit is further configured to provide a second driving signal to the driving circuit through a third pin of the driving circuit, so as to control the driving circuit to provide the input voltage to the gate of the driving MOS transistor through the input circuit.

According to an embodiment of the present disclosure, the driving circuit includes: an input circuit for a clock driving signal; one end of the input circuit is connected with the control unit through a second pin of the driving circuit to receive a clock driving signal provided by the control unit, and the other end of the input circuit is connected with a third end of the switch unit to provide the voltage of the clock driving signal to the third end of the switch unit.

According to an embodiment of the present disclosure, the input circuit includes: a third diode and a fourth diode; the anode of the third diode is connected with the control unit through the second pin, and the cathode of the third diode is connected with the anode of the fourth diode; and the cathode of the fourth diode is connected with the third end of the switch unit.

According to an embodiment of the present disclosure, the control unit includes: and a single chip microcomputer.

According to an embodiment of the present disclosure, the method further includes: the detection circuit is connected with the control unit; the single chip microcomputer comprises a plurality of current detection pins, a temperature detection pin and an impedance detection pin so as to control the detection circuit to carry out corresponding current, temperature and impedance detection.

According to an embodiment of the present disclosure, the control unit is further configured to control the driving circuit to drive the switch unit to be turned on, and then control the battery unit to be charged with a first current value within a first time range, and then charge the battery unit with a second current value within a second time range, determine whether the current of the battery unit detected by the detection circuit is greater than a first current threshold, and when the current of the battery unit is greater than the first current threshold, continue to charge the battery unit with the first current value; wherein the first current value is greater than the second current value.

According to an embodiment of the present disclosure, the switching unit includes: the MOS transistor comprises a first MOS transistor and a second MOS transistor; the first pole of the first MOS tube is connected with the battery unit through the first end, the first pole of the second MOS tube is connected with the charging interface through the second end, the second pole of the first MOS tube is connected with the second pole of the second MOS tube, and the control pole of the first MOS tube is connected with the control pole of the second MOS tube; the control unit is further used for controlling the detection circuit to detect the on-resistance of the first MOS tube and/or the second MOS tube, and when the on-resistance of the first MOS tube and/or the second MOS tube is larger than an impedance threshold value, the drive circuit is controlled to drive the switch unit to be closed so as to stop charging the battery unit.

According to the device to be charged provided by the embodiment of the disclosure, the control of the quick charging mode and the control of the common charging mode are combined together. The control unit 15 may turn on the Fast charge mode when the first driving signal Fast _ switch of the high level is input; when a first driving signal Fast _ switch of a low level is input, closing the Fast charging mode; when the input voltage is collected and detected, on one hand, the input voltage provided by the charging interface 11 is provided to the driving MOS transistor V5, so that the common mode charging is realized; on the other hand, the acquired signals are reversely input to the control unit 15, so that the detection of the input voltage provided by the charging interface 11 is realized. The design improves the reliability of the charging circuit, and when the charging circuit cannot be rapidly charged, the charging circuit can be normally charged through the path, so that the phenomenon of charging failure is avoided.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a block diagram illustrating a device to be charged according to an exemplary embodiment.

Fig. 2 is a circuit diagram illustrating a switching unit and a driving circuit according to an exemplary embodiment.

FIG. 3 is a circuit schematic of a control unit shown according to an exemplary embodiment.

Fig. 4 is a block diagram illustrating another device to be charged according to an example embodiment.

FIG. 5 is a schematic diagram illustrating a temperature detection circuit according to an exemplary embodiment.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and the like. In other instances, well-known structures, methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.

In the present disclosure, unless expressly stated or limited otherwise, the terms "connected" and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection, or as an integral part; can be a mechanical connection, can also be an electrical connection, or can also be a communication connection; they may be directly connected or indirectly connected through intervening media, or may be connected through one or more other elements or in an interactive relationship between two elements. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.

Further, in the description of the present disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. "and/or" describes the association relationship of the associated objects, and means that there may be three relationships, for example, a and/or B, and that there may be three cases of a alone, B alone, and a and B simultaneously. The symbol "/" generally indicates that the former and latter associated objects are in an "or" relationship. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Before the embodiments of the present disclosure are described, a "normal charging mode" and a "quick charging mode" in the charging system will be described. The normal charging mode refers to the adapter outputting a relatively small current value (typically less than 2.5A) or charging the battery in the device to be charged with a relatively small power (typically less than 15W). It usually takes several hours to fully charge a larger capacity battery (e.g., 3000 ma-hour capacity battery) in the normal charging mode. The fast charging mode means that the adapter is capable of outputting a relatively large current (typically greater than 2.5A, such as 4.5A, 5A or even higher) or charging the battery in the device to be charged with a relatively large power (typically greater than or equal to 15W). Compared with the ordinary charging mode, the adapter has higher charging speed in the quick charging mode, and the charging time required for completely charging the battery with the same capacity can be obviously shortened.

In the charging process, a Power supply device (such as a Power adapter, a portable Power source (Power Bank), and the like) is generally connected to a device to be charged through a cable, and electric energy provided by the Power supply device is transmitted to the device to be charged through the cable to charge the device to be charged.

In order to improve the charging power of the device to be charged so as to achieve the purpose of quick charging, one scheme is to charge the device to be charged by adopting large current. The larger the charging current, the faster the charging speed of the device to be charged. In the fast charging scheme, a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) is usually set to be electrically connected to a battery in a device to be charged, and a driving circuit electrically connected to the MOS Transistor is controlled by a control module such as an MCU (micro controller Unit) to turn on and off the MOS Transistor, so as to start and stop fast charging.

The device to be charged 10 as shown in fig. 1 may be, for example, a terminal or a communication terminal including, but not limited to, a device configured to receive/transmit communication signals via a wireline connection, such as via a Public Switched Telephone Network (PSTN), a Digital Subscriber Line (DSL), a digital cable, a direct cable connection, and/or another data connection/network and/or via, for example, a digital television network such as a cellular network, a Wireless Local Area Network (WLAN), a DVB-H network, a satellite network, an amplitude modulation-frequency modulation (AM-FM) broadcast transmitter, and/or a wireless interface of another communication terminal. Communication terminals arranged to communicate over a wireless interface may be referred to as "wireless communication terminals", "wireless terminals", and/or "mobile terminals". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal Communication System (PCS) terminals that may combine a cellular radiotelephone with data processing, facsimile and data communication capabilities; personal Digital Assistants (PDAs) that may include radiotelephones, pagers, internet/intranet access, Web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. In addition, the terminal may further include, but is not limited to, a rechargeable electronic device having a charging function, such as an electronic book reader, a smart wearable device, a mobile power source (e.g., a charger, a travel charger), an electronic cigarette, a wireless mouse, a wireless keyboard, a wireless headset, a bluetooth speaker, and the like.

Referring to fig. 1, the device to be charged 10 includes: charging interface 11, battery unit 12, switch unit 13, drive circuit 14 and control unit 15.

The device to be charged 10 is connected to the power supply device 20 through the charging interface 11 to charge the battery unit 12. The charging interface 11 may be, for example, a USB 2.0 interface, a Micro USB interface, or a USB TYPE-C interface. In some embodiments, the charging interface 11 may also be a lightning interface, or any other type of parallel interface or serial interface capable of being used for charging.

Battery unit 12 may be a lithium battery comprising a single lithium battery cell, or may be a lithium battery comprising a plurality of lithium battery cells, or battery unit 12 may further comprise a plurality of battery units, each battery unit comprising one or more lithium battery cells.

For the equipment to be charged containing a single battery cell, when a large charging current is used for charging the single battery cell, the heating phenomenon of the equipment to be charged is serious. In order to guarantee the charging speed of the equipment to be charged and relieve the heating phenomenon of the equipment to be charged in the charging process, the battery structure can be modified, a plurality of battery cores which are mutually connected in series are used, and the plurality of battery cores are directly charged, namely, the voltage output by the adapter is directly loaded to the two ends of the battery unit comprising the plurality of battery cores. Compared with the single-battery-core scheme (that is, the capacity of a single battery core before improvement is considered to be the same as the total capacity of the plurality of battery cores connected in series after improvement), if the same charging speed is to be achieved, the charging current required by the plurality of battery cores is about 1/N (N is the number of the battery cores connected in series) of the charging current required by the single battery core, in other words, on the premise of ensuring the same charging speed, the plurality of battery cores are connected in series, so that the size of the charging current can be greatly reduced, and the heat productivity of the device to be charged in the charging process is further reduced.

The switch unit 13 includes a first terminal p1, a second terminal p2, and a third terminal p 3. The first terminal p1 is connected to the battery unit 12, the second terminal p2 is connected to the charging interface 11, and the third terminal p3 is connected to the driving circuit 14.

When the switching unit 13 is turned on, the battery unit 12 is charged in the first charging mode by the voltage and current inputted through the charging interface 11; when the switching unit 13 is turned off, the charging of the battery cell 12 in the first charging mode is stopped, i.e., the first charging mode is exited. The first charging mode is, for example, the fast charging mode described above.

The driving circuit 14 is used for driving the switch unit 13 to be turned on and off, so as to control the fast charging mode to be turned on and off.

The control unit 15 is connected to the driving circuit 14, and is configured to provide a first driving signal to the driving circuit 14 through a first Pin (e.g., Pin _1 in fig. 2) of the driving circuit 14, and control the driving circuit 14 to drive the switching unit 13 to turn on and off; and is also used to detect the input voltage of the charging interface 11 in the second charging mode through the first pin.

The second charging mode is, for example, the aforementioned normal charging mode, and the charging power in the first charging mode is greater than the charging power in the second charging mode.

The following takes the circuit diagram of the switch unit 13 and the driving circuit 14 shown in fig. 2 as an example, and further illustrates how the control unit 15 controls the on/off of the first charging mode through the first pin, and how to detect the magnitude of the collected input voltage of the charging interface 11 through the first pin in the second charging mode.

Referring to fig. 2, the switch unit 13 includes, for example, a first MOS transistor V1 and a second MOS transistor V2, wherein a first pole (e.g., drain D) of the first MOS transistor V1 is connected to the battery cell 12 through the first end p1, a first pole (e.g., drain D) of the second MOS transistor V2 is connected to the charging interface 11 through the second end p2, a second pole (e.g., sources S _0 to S _2) of the first MOS transistor V1 is connected to second poles (e.g., sources S _0 to S _2) of the second MOS transistor V2, and a control pole (e.g., gate G) of the first MOS transistor V1 is connected to a control pole (e.g., gate g., gate G) of the second MOS transistor V2. Namely, the first MOS transistor V1 is connected in series with the second MOS transistor V2 in an inverted manner.

Referring to fig. 1 in combination with fig. 2, during Fast charging of the device to be charged 10 (e.g., when a Fast charging adapter is connected, the Fast charging adapter can output a relatively large current (typically greater than 2.5A, such as 4.5A, 5A or even higher) or output a relatively large power (typically greater than or equal to 15W)), the control unit 15 provides the first driving signal Fast _ switch to the driving circuit 14 through the Pin _1, and the first driving signal Fast _ switch is set to a high level. At this time, the voltage of the control electrode (e.g., gate G) of the driving MOS transistor V5 in the driving circuit 14 is high, and the driving MOS transistor V5 is turned on. The voltage VBUS output by the power supply device 20 is loaded between the diode D1 and the diode D2 through the diode D1. The clock driving signal CLK _ OUT provided by the control unit 15 to the driving circuit 14 through the Pin _2 is a square wave signal, and is also loaded between the diode D1 and the diode D2. In order to reduce the consumption of the capacitor C5 and reduce the power consumption of the entire charging circuit, the resistance value of the resistor R3 is usually relatively large (e.g., above 100K ohms), and the current flowing through the resistors R1 and R3 is small, so the voltage drop caused by these resistors is also small. Therefore, the voltage VBUS superimposed on the voltage Vclk of the clock driving signal CLK _ OUT can drive the first MOS transistor V1 and the second MOS transistor V2 to be turned on, that is, the switch unit 13 is driven to be turned on.

When the control unit 15 controls the input of the first driving signal Fast _ switch to be set to the low level through the first Pin _1, the voltage of the control electrode of the driving MOS transistor V5 is low, the driving MOS transistor V5 is turned off, and further the first MOS transistor V1 and the second MOS transistor V2 are turned off, that is, the driving switch unit 13 is turned off, and the Fast charging of the battery unit 12 is stopped.

In addition, as shown in fig. 2, the driving circuit 14 further includes an input circuit for inputting a voltage provided by the charging interface 11 composed of a resistor R6 and a diode D6, one end of the input circuit is connected to the charging interface 11, the other end of the input circuit is connected to the control electrode of the driving MOS transistor V5, and the input circuit is connected to the control unit 15 through the first Pin _1, so as to provide the input voltage provided by the charging interface 11 to the battery unit 12, and thus, the battery unit 12 is charged in the second charging mode (the above-mentioned normal charging mode). In the second charging mode, the control unit 15 is further configured to collect an output signal of the input circuit to detect a magnitude of the input voltage provided by the charging interface 11 in the second charging mode. The diode D6 can form a loop with the input voltage VBUS provided by the charging interface 11 when the first driving signal Fast _ switch is at a low level, so as to discharge the overcharge current, thereby improving the charging stability. Meanwhile, the loop is also favorable for heat dissipation, and the problem of high-temperature and low-temperature storage work can be solved.

It should be clearly understood that this disclosure describes how to make and use particular examples, but the principles of this disclosure are not limited to any details of these examples. Rather, these principles can be applied to many other embodiments based on the teachings of the present disclosure.

In some embodiments, the second pole (source as shown in fig. 2) of the driving MOS transistor V5 may also be grounded through the diode D5. The anode of the diode D5 is connected to the second pole of the driving MOS transistor, and the cathode is grounded. The connection mode can form a loop, prevent the voltage from flowing back to the chip and damaging the chip, and further provide the charging reliability. In addition, the diode D5 can also improve the problem of high-temperature and low-temperature storage operation.

In some embodiments, as shown in fig. 2, the control unit 15 may be further configured to provide a second driving signal VOOC _ MOS _ G through the third Pin _3 of the driving circuit 14 to control the driving circuit 14 to provide the input voltage VBUS provided by the charging interface 11 to the control electrode of the driving MOS transistor V5. The setting of this control bit can stably detect drive MOS pipe control ware utmost point voltage, guarantees to charge stably, solves and fills the problem of not advancing the electricity, can also improve the intermittent problem that charges in addition.

In some embodiments, the resistor R2 connected between the control electrodes of the first and second MOS transistors V1 and V2 and the ground can also adjust the amplification factor by designing the resistance value thereof, and adjust the current of the control electrode of the driving MOS transistor V5, thereby adjusting the output voltage provided to the battery unit 12.

In some embodiments, as shown in fig. 2, the driving circuit 15 further includes: the input circuit of the clock driving signal CLK _ OUT consists of capacitors C2, C3 and C4 and diodes D2, D3 and D4. One end of the input circuit is connected with the control unit 15 through a second Pin _2 of the driving circuit 14, and receives a clock driving signal CLK _ OUT provided by the control unit 15; the other end is connected to the third terminal p3 of the switch unit 13 to provide the voltage of the clock driving signal CLK _ OUT to the third terminal p3 of the switch unit 13, i.e., to the gates of the first MOS transistor V1 and the second MOS transistor V2. The diodes D3 and D4 ensure unidirectional conduction of the circuit, and prevent the current from flowing backward to the control unit 15 and damaging the control unit 15 due to inconsistent power-on time sequences of the devices to be charged. Meanwhile, the high level voltage drop of the clock driving signal CLK _ OUT can be reduced, and the charging reliability is improved. In addition, the diode also has temperature characteristics, can compensate part high low temperature change, improves the problem of high temperature low temperature storage work.

Referring to fig. 3, the control unit 15 further includes a single chip microcomputer U1. The single chip microcomputer is provided with more input/output (I/O) interfaces and can provide more control bits, so that more control functions can be provided for other modules in the device to be charged. In addition, the signal acquisition of the single chip microcomputer is more convenient, and the processing speed is higher.

Unlike the device to be charged 10 shown in fig. 1, the device to be charged 30 further includes: a detection circuit 16. The detection circuit 16 is connected to the control unit 15. Referring to fig. 3 and 4 jointly, the single-chip microcomputer U1 further includes a plurality of current detection pins (e.g., pin P _2 for providing VBAT _ ADC signal, pin P _3 for providing VBUS _ ADC control signal, and pin P _4 for providing Vfb signal), a temperature detection pin (e.g., pin P _5 for providing TEM3_ ACD signal), and an impedance detection pin (e.g., pin P _6 for providing TEM2_ ACD signal). The control unit 15 can control the detection circuit 16 to perform corresponding current detection, temperature detection and impedance detection through the pins. For example, the VBAT _ ADC signal may be used to control the current of the battery, the VBUS _ ADC may be used to control the input current provided by the charging interface 11, and so on. In addition, a thermistor can be adopted during temperature detection, so that the detection speed is higher. FIG. 5 is a schematic diagram illustrating a temperature detection circuit according to an exemplary embodiment. As shown in fig. 5, a thermistor Rt may be included in the temperature detection circuit for temperature detection.

In some embodiments, the control unit 15 is further configured to control to charge the battery unit 12 with a first current value in a first time range and charge the battery unit with a second current value in a second time range after controlling the driving circuit 14 to drive the switch unit 13 to be turned on (i.e., when the fast charging is started), and determine whether the current of the battery unit 12 detected by the detection circuit 16 is greater than a first current threshold, so as to determine whether the device to be charged 10 can perform the fast charging or determine whether the device to be charged 10 has a problem of charging interruption. When the current of the battery cell 12 is greater than the first current threshold, the battery cell 12 continues to be charged at the first current value. Wherein the first current value is greater than the second current value. The setting of the above parameters may be set according to actual requirements in an application, and the disclosure is not limited thereto.

In addition, the first MOS transistor V1 and the second MOS transistor V2 in the switch unit 13 have the problem that the first MOS transistor V1 and the second MOS transistor V2 are not completely conducted due to gate-source leakage and low gate voltage, and the on-resistance is large. In some embodiments, the control unit 15 may further be configured to control the detection circuit 16 to detect the on-resistance of the first MOS transistor V1 and/or the second MOS transistor V2. When the on-resistance of the first MOS transistor V1 and/or the second MOS transistor V2 is greater than the resistance threshold, the control driving circuit 14 drives the switch unit 13 to close to stop charging the battery unit 12. In order to solve the problem of the resistance to conduction becoming large, the resistance threshold value may be set to a high value, so that the battery cell 12 may be charged in this case as well. Due to the larger on-resistance, the first MOS transistor V1 and/or the second MOS transistor become hot due to the continuous charging, so that the electron migration problem of the first MOS transistor V1 and/or the second MOS transistor can be improved.

Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. An apparatus to be charged, comprising:

a charging interface;

a battery cell;

a switch unit comprising: the first end is connected with the battery unit, and the second end is connected with the charging interface; when the switch unit is conducted, the battery unit is charged through the voltage and the current input by the charging interface in a first charging mode; stopping charging the battery unit in the first charging mode when the switching unit is turned off;

the driving circuit is connected with the third end of the switch unit and is used for driving the switch unit to be switched on or switched off; and

the control unit is connected with the driving circuit and used for providing a first driving signal to the driving circuit through a first pin of the driving circuit and controlling the driving circuit to drive the switch unit to be switched on and off; the input voltage of the charging interface in the second charging mode is detected through the first pin;

wherein the charging power in the first charging mode is greater than the charging power in the second charging mode.

2. The device to be charged according to claim 1, wherein the drive circuit further comprises: the driving MOS tube and the first diode; the first pole of the driving MOS tube is connected with the charging interface, the control pole is connected with the control unit through the first pin, and the second pole is connected with the anode of the first diode; the cathode of the first diode is grounded; the control unit provides the first driving signal to the control electrode of the driving MOS tube through the first pin, and controls the driving circuit to drive the switch unit to be switched on and off.

3. A device to be charged according to claim 2, wherein the drive circuit comprises: an input circuit for the input voltage; one end of the input circuit is connected with the charging interface, the other end of the input circuit is connected with the control electrode of the driving MOS tube, and the input circuit is connected with the control unit through the first pin; the input voltage is provided to the battery unit through a control electrode of the driving MOS tube so as to charge the battery unit in the second charging mode; the control unit is used for collecting an output signal of the input circuit so as to detect the input voltage in the second charging mode.

4. A device to be charged according to claim 3, characterized in that the input circuit comprises: a first resistor and a second diode; one end of the first resistor is connected with the charging interface, and the other end of the first resistor is connected with the anode of the second diode; and the cathode of the second diode is connected with the control electrode of the driving MOS tube and is connected with the control unit through the first pin.

5. The device to be charged according to claim 3 or 4, wherein the control unit is further configured to provide a second driving signal to the driving circuit through a third pin of the driving circuit, so as to control the driving circuit to provide the input voltage to the control electrode of the driving MOS transistor through the input circuit.

6. A device to be charged according to claim 1, wherein the drive circuit comprises: an input circuit for a clock driving signal; one end of the input circuit is connected with the control unit through a second pin of the driving circuit to receive a clock driving signal provided by the control unit, and the other end of the input circuit is connected with a third end of the switch unit to provide the voltage of the clock driving signal to the third end of the switch unit.

7. The device to be charged according to claim 6, wherein the input circuit comprises: a third diode and a fourth diode; the anode of the third diode is connected with the control unit through the second pin, and the cathode of the third diode is connected with the anode of the fourth diode; and the cathode of the fourth diode is connected with the third end of the switch unit.

8. The apparatus to be charged according to claim 1, wherein the control unit comprises: and a single chip microcomputer.

9. The apparatus to be charged according to claim 8, further comprising: the detection circuit is connected with the control unit; the single chip microcomputer comprises a plurality of current detection pins, a temperature detection pin and an impedance detection pin so as to control the detection circuit to carry out corresponding current, temperature and impedance detection.

10. The device to be charged according to claim 9, wherein the control unit is further configured to control the battery unit to be charged with a first current value in a first time range after controlling the driving circuit to drive the switch unit to be turned on, to be charged with a second current value in a second time range after the first time range, to determine whether the current of the battery unit detected by the detection circuit is greater than a first current threshold, and to continue to charge the battery unit with the first current value when the current of the battery unit is greater than the first current threshold; wherein the first current value is greater than the second current value.

11. The apparatus to be charged according to claim 9, wherein the switching unit comprises: the MOS transistor comprises a first MOS transistor and a second MOS transistor; the first pole of the first MOS tube is connected with the battery unit through the first end, the first pole of the second MOS tube is connected with the charging interface through the second end, the second pole of the first MOS tube is connected with the second pole of the second MOS tube, and the control pole of the first MOS tube is connected with the control pole of the second MOS tube; the control unit is further used for controlling the detection circuit to detect the on-resistance of the first MOS tube and/or the second MOS tube, and when the on-resistance of the first MOS tube and/or the second MOS tube is larger than an impedance threshold value, the drive circuit is controlled to drive the switch unit to be closed so as to stop charging the battery unit.