CN110676898B

CN110676898B - Equipment to be charged

Info

Publication number: CN110676898B
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: 2023-06-02
Anticipated expiration: 2039-09-16
Also published as: CN110676898A

Abstract

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

Description

Equipment to be charged

Technical Field

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

Background

Devices to be charged (such as smartphones, mobile terminals or smart devices) are increasingly popular with consumers, but the devices to be charged have high power consumption and need to be charged frequently, and a low-power common charging scheme is generally used for charging the devices to be charged for a period of hours, so that in order to cope with this challenge, the industry proposes to charge the devices to be charged through a quick charging scheme for increasing the charging power of the devices to be charged.

However, in the current rapid charging scheme, the charging reliability is poor, and the phenomenon of charging failure occurs probabilistically.

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

Disclosure of Invention

The utility model provides a wait to charge equipment, reliability when can promoting the charging.

Other features and advantages of the present disclosure will be apparent from the following detailed description, or may be learned in part by the 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 unit; a switching 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 in a first charging mode by the voltage and the current input through 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 turned on or turned off; the control unit is connected with the driving circuit and used for providing a first driving signal for the driving circuit through a first pin of the driving circuit and controlling the driving circuit to drive the switching unit to be turned on and turned off; and is configured to detect an input voltage of the charging interface in a second charging mode 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: a driving MOS tube and a first diode; the first electrode of the driving MOS tube is connected with the charging interface, the control electrode is connected with the control unit through the first pin, and the second electrode is connected with the positive electrode of the first diode; the cathode of the first diode is grounded; the control unit provides the first driving signal for the control electrode of the driving MOS tube through the first pin, and controls the driving circuit to drive the switching unit to be turned on and turned off.

According to an embodiment of the present disclosure, the driving circuit includes: an input circuit for inputting the voltage; one end of the input circuit is connected with the charging interface, and the other end of the input circuit is connected with the control electrode of the driving MOS tube and is connected with the control unit through the first pin; the input voltage is provided to the battery unit through the 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 output signals 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; the negative electrode 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 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 control electrode 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, receives the clock driving signal provided by the control unit, and the other end of the input circuit is connected with the third end of the switch unit so as 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 positive electrode of the third diode is connected with the control unit through the second pin, and the negative electrode of the third diode is connected with the positive electrode 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 singlechip.

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

According to an embodiment of the disclosure, the control unit is further configured to control, after controlling the driving circuit to drive the switch unit to be turned on, charging the battery unit at a first current value in a first time range, charging the battery unit at a second current value in a second time range, determining whether the current of the battery unit detected by the detection circuit is greater than a first current threshold, and continuing to charge the battery unit at 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.

According to an embodiment of the present disclosure, the switching unit includes: the first MOS tube and the second MOS tube; the first electrode of the first MOS tube is connected with the battery unit through the first end, the first electrode of the second MOS tube is connected with the charging interface through the second end, the second electrode of the first MOS tube is connected with the second electrode of the second MOS tube, and the control electrode of the first MOS tube is connected with the control electrode of the second MOS tube; the control unit is also used for controlling the detection circuit to detect the conduction impedance of the first MOS tube and/or the second MOS tube, and controlling the driving circuit to drive the switch unit to be closed so as to stop charging the battery unit when the conduction impedance of the first MOS tube and/or the second MOS tube is larger than an impedance threshold.

According to the device to be charged provided by the embodiment of the disclosure, the control of the quick charging mode is combined with the control of the normal charging mode. The control unit 15 may start the Fast charge mode when the first driving signal fast_switch of the high level is input; when a first drive signal fast_switch with a low level is input, a Fast charging mode is closed; when the input voltage is acquired and detected, on one hand, the input voltage provided by the charging interface 11 is provided to the driving MOS tube V5, so that the common mode charging is realized; on the other hand, the collected signals are reversely input to the control unit 15, so that the input voltage provided by the charging interface 11 is detected. The design improves the reliability of the charging circuit, and when the charging circuit cannot charge quickly, the charging circuit can also charge normally through the channel, so that the phenomenon of no charging 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 of a device to be charged, according to an exemplary embodiment.

Fig. 2 is a circuit diagram of a switching unit and a driving circuit shown 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 of another device to be charged, according to an example embodiment.

Fig. 5 is a schematic diagram illustrating a temperature detection circuit according to an example embodiment.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many 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 the 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 a repetitive description thereof 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 present disclosure. One skilled in the relevant art will recognize, however, that the aspects of the disclosure may be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. 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 explicitly specified and limited otherwise, the terms "connected," "connected," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be a mechanical connection, an electrical connection, or a communication connection; can be directly connected, can be indirectly connected through an intermediate medium, and can also be the communication between the two elements or the interaction relationship between the two elements. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art as the case may be.

Furthermore, in the description of the present disclosure, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise. "and/or" describes an association relationship of an associated object, meaning that there may be three relationships, e.g., a and/or B, and that there may be a alone, B alone, and both a and B. The symbol "/" generally indicates that the context-dependent object is an "or" relationship. The terms "first," "second," and the like, 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 defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

Before describing the embodiments of the present disclosure, a description will be given of a "normal charging mode" and a "fast charging mode" in a charging system. The normal charging mode refers to the adapter outputting a relatively small current value (typically less than 2.5A) or charging a battery in a device to be charged with relatively small power (typically less than 15W). In the normal charging mode, it is often necessary to take several hours to fully charge a larger capacity battery (e.g., a 3000 milliamp capacity battery). The fast charge mode refers to the adapter being able to output a relatively large current (typically greater than 2.5A, such as 4.5A,5A or even higher) or to charge a battery in a device to be charged with a relatively large power (typically 15W or more). Compared with the common charging mode, the charging speed of the adapter in the quick charging mode is higher, and the charging time required for completely filling the batteries with the same capacity can be obviously shortened.

In the charging process, a Power supply device (such as a Power adapter, a mobile Power Bank, etc.) is generally connected to a device to be charged through a cable, and the 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 equipment to be charged so as to achieve the purpose of rapid charging, one scheme is to charge the equipment to be charged by adopting high current. The larger the charging current, the faster the charging speed of the device to be charged. In the fast charging scheme, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor, metal oxide semiconductor field effect transistor, hereinafter referred to as MOS transistor) is generally disposed and electrically connected to a battery in a device to be charged, and a control module such as an MCU (Microcontroller Unit, micro control unit) controls a driving circuit electrically connected to the MOS transistor to turn on and off the MOS transistor, so as to turn on and off the fast charging.

The device 10 to be charged as shown in fig. 1 may be, for example, a terminal or a communication terminal including, but not limited to, means arranged to receive/transmit communication signals via a wireline connection, such as via a public-switched telephone network (public switched telephone network, PSTN), a digital subscriber line (digital subscriber line, DSL), a digital cable, a direct cable connection, and/or another data connection/network and/or via a wireless interface, for example, to a cellular network, a wireless local area network (wireless local area network, WLAN), a digital television network such as a digital video broadcasting-handheld (digital video broadcasting handheld, DVB-H) network, a satellite network, an amplitude-modulation-frequency modulation (amplitude modulation-frequency modulation, AM-FM) broadcast transmitter, and/or another communication terminal. A communication terminal configured to communicate via a wireless interface may be referred to as a "wireless communication terminal," wireless terminal, "and/or" mobile terminal. Examples of mobile terminals include, but are not limited to, satellites or cellular telephones; a personal communications system (personal communication system, PCS) terminal that may combine a cellular radiotelephone with data processing, facsimile and data communications capabilities; personal digital assistants (Personal Digital Assistant, PDA) that may include a radiotelephone, pager, internet/intranet access, web browser, organizer, calendar, and/or a global positioning system (global positioning system, GPS) receiver; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. In addition, the terminal can further comprise, but is not limited to, chargeable electronic devices with charging functions, such as electronic book readers, intelligent wearable devices, mobile power sources (such as charger, travel charger), electronic cigarettes, wireless mice, wireless keyboards, wireless headphones, bluetooth sound boxes 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 lighting interface, or any other type of parallel or serial port that can be used for charging.

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

For a device to be charged including a single battery cell, when a larger charging current is used to charge the single battery cell, the heating phenomenon of the device to be charged is serious. In order to ensure the charging speed of the equipment to be charged and alleviate the heating phenomenon of the equipment to be charged in the charging process, the battery structure can be modified, a plurality of battery cells which are mutually connected in series are used, and the plurality of battery cells 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 cells. Compared with the single-cell scheme (namely, the capacity of the single cell before improvement is considered to be the same as the total capacity of the multiple cells connected in series after improvement), if the same charging speed is to be achieved, the charging current required by the multiple-section cells is about 1/N of the charging current required by the single cell (N is the number of the cells connected in series), in other words, the magnitude of the charging current can be greatly reduced by connecting the multiple-section cells in series on the premise of ensuring the same charging speed, so that the heating value of equipment 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 p3. Wherein the first terminal p1 is connected with the battery unit 12, the second terminal p2 is connected with the charging interface 11, and the third terminal p3 is connected with the driving circuit 14.

When the switching unit 13 is turned on, the voltage and current input through the charging interface 11 charge the battery unit 12 in the first charging mode; when the switch unit 13 is turned off, the charging of the battery unit 12 in the first charging mode is stopped, i.e., the first charging mode is exited. The first charging mode is, for example, the aforementioned fast charging mode.

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

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 be turned on and off; and is also used to detect the input voltage of the charging interface 11 in the second charging mode via 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.

Taking the circuit diagram of the switching unit 13 and the driving circuit 14 shown in fig. 2 as an example, it is further described how the control unit 15 controls the on and 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., a drain D) of the first MOS transistor V1 is connected to the battery unit 12 through the first end p1, a first pole (e.g., a 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 a second pole (e.g., sources s_0 to s_2) of the second MOS transistor V2, and a control pole (e.g., a gate G) of the first MOS transistor V1 is connected to a control pole (e.g., a gate G) of the second MOS transistor V2. Namely, the first MOS tube V1 and the second MOS tube V2 are in reverse series connection.

Referring to fig. 1 and 2 in combination, during a Fast charging process of the device to be charged 10 (e.g., connecting a Fast charging adapter, the Fast charging adapter is capable of outputting a relatively large current (typically greater than 2.5A, such as 4.5A,5A or even higher) or outputting 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 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., the 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 from the power supply device 20 is applied between the diode D1 and the diode D2 through the diode D1. The clock driving signal clk_out provided to the driving circuit 14 through the Pin pin_2 by the control unit 15 is a square wave signal, and is also applied 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 whole charging circuit, the resistance value of the resistor R3 is generally relatively large (for example, above 100K ohms), and the current flowing through the resistors R1 and R3 is small, so that the voltage drop caused by the resistors is also small. Therefore, the voltage VBUS superimposed with 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, drive the switch unit 13 to be turned on.

When the first driving signal fast_switch inputted by the control unit 15 through the first Pin pin_1 is set to be low level, the voltage of the control electrode of the driving MOS transistor V5 is low, the driving MOS transistor V5 is turned off, and the first MOS transistor V1 and the second MOS transistor V2 are further turned off, that is, the driving switch unit 13 is turned off, so as to stop the Fast charging of the battery unit 12.

In addition, as shown in fig. 2, the driving circuit 14 further includes an input circuit of an input voltage provided by the charging interface 11 formed by the resistor R6 and the diode D6, one end of the input circuit is connected to the charging interface 11, the other end is connected to the control electrode of the driving MOS transistor V5, and is connected to the control unit 15 through the first Pin pin_1, so as to provide the input voltage provided by the charging interface 11 to the battery unit 12, so as to charge the battery unit 12 in the second charging mode (such as the above-mentioned normal charging mode). In addition, in the second charging mode, the control unit 15 is further configured to collect an output signal of the input circuit, so as to detect a magnitude of the input voltage provided by the charging interface 11 in the second charging mode. When the first driving signal fast_switch is at a low level, the diode D6 may form a loop with the input voltage VBUS provided by the charging interface 11, and discharge the overcharge current, so as to improve charging stability. Meanwhile, the loop is also beneficial to heat dissipation, and can improve the problem of high-temperature and low-temperature storage work.

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 positive pole of the diode D5 is connected with the second pole of the driving MOS tube, and the negative pole is grounded. The connection mode can form a loop, prevent voltage from flowing backwards to the chip, damage the chip and further provide charging reliability. In addition, the arrangement of the diode D5 can also improve the problem of the high-temperature and low-temperature storage operation at the same time.

In some embodiments, as shown in fig. 2, the control unit 15 may be further configured to provide the second driving signal vooc_mos_g through the third Pin 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 stabilize and detect drive MOS pipe control electrode voltage, guarantees to charge stably, solves the problem that the charging can not go into the electricity, can also improve the intermittent problem of charging in addition.

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

In some embodiments, as shown in fig. 2, the driving circuit 15 further includes: an input circuit for the clock driving signal clk_out consisting of capacitors C2, C3, C4 and diodes D2, D3, D4. One end of the input circuit is connected with the control unit 15 through a second Pin 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 control electrodes of the first MOS transistor V1 and the second MOS transistor V2. The diodes D3 and D4 ensure unidirectional conduction of the circuit, so as to prevent the current from flowing backward to the control unit 15 due to inconsistent starting time sequence of the equipment to be charged, and damage to the control unit 15. 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, so that the diode can compensate partial high and low temperature changes and improve the problem of high-temperature and low-temperature storage work.

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

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 in combination, the single chip 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. Such as vbat_adc signal may be used to control the current to detect the battery, vbus_adc may be used to control the input current provided by the charging interface 11, etc. In addition, a thermistor can be adopted in temperature detection, so that the detection rate is faster. Fig. 5 is a schematic diagram illustrating a temperature detection circuit according to an example 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 at a first current value in a first time range and charge the battery unit at a second current value in a second time range after the control driving circuit 14 drives the switch unit 13 to be turned on (i.e. when the quick charge is started), and determine whether the current of the battery unit 12 detected by the detection circuit 16 is greater than the first current threshold, so as to determine whether the quick charge of the device to be charged 10 is possible or whether the charging discontinuity problem exists in the device to be charged 10. When the current of the battery cell 12 is greater than the first current threshold, charging of the battery cell 12 with the first current value is continued. Wherein the first current value is greater than the second current value. It should be noted that the setting of each parameter may be set according to the actual requirement in the 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 problems of incomplete conduction and larger conduction resistance due to the drain-source current and the lower gate voltage of the gate. In some embodiments, the control unit 15 may also 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 driving circuit 14 is controlled to drive the switch unit 13 to be turned off, so as to stop charging the battery unit 12. In order to solve the above-described problem of the on-resistance becoming large, the resistance threshold may be set to a high value so that the battery cell 12 may be charged in this case as well. Because the on-resistance is larger, the first MOS tube V1 and/or the second MOS tube can be heated by continuing to charge, so that the electron migration problem of the first MOS tube V1 and/or the second MOS tube can be improved.

Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that this disclosure is not limited to the particular arrangements, instrumentalities and methods of implementation 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. A device to be charged, characterized by comprising:

a charging interface;

a battery unit;

a switching 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 in a first charging mode by the voltage and the current input through 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 turned on or turned off; and

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

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

the driving circuit further includes: a driving MOS tube and a first diode; the first electrode of the driving MOS tube is connected with the charging interface, the control electrode is connected with the control unit through the first pin, and the second electrode is connected with the positive electrode of the first diode; the cathode of the first diode is grounded; the control unit provides the first driving signal for the control electrode of the driving MOS tube through the first pin, and controls the driving circuit to drive the switching unit to be turned on and turned off.

2. The apparatus to be charged according to claim 1, wherein said driving circuit includes: an input circuit for inputting the voltage; one end of the input circuit is connected with the charging interface, and the other end of the input circuit is connected with the control electrode of the driving MOS tube and is connected with the control unit through the first pin; the input voltage is provided to the battery unit through the 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 output signals of the input circuit so as to detect the input voltage in the second charging mode.

3. The device to be charged according to claim 2, wherein said 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; the negative electrode 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.

4. A device to be charged according to claim 2 or 3, 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.

5. The apparatus to be charged according to claim 1, wherein said 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, receives the clock driving signal provided by the control unit, and the other end of the input circuit is connected with the third end of the switch unit so as to provide the voltage of the clock driving signal to the third end of the switch unit.

6. The device to be charged according to claim 5, wherein said input circuit comprises: a third diode and a fourth diode; the positive electrode of the third diode is connected with the control unit through the second pin, and the negative electrode of the third diode is connected with the positive electrode of the fourth diode; and the cathode of the fourth diode is connected with the third end of the switch unit.

7. The device to be charged according to claim 1, characterized in that said control unit comprises: and a singlechip.

8. The apparatus to be charged according to claim 7, further comprising: the detection circuit is connected with the control unit; the singlechip comprises a plurality of current detection pins, temperature detection pins and impedance detection pins, so as to control the detection circuit to carry out corresponding current, temperature and impedance detection.

9. The apparatus to be charged according to claim 8, wherein said control unit is further configured to control, after controlling said driving circuit to drive said switching unit to be turned on, charging said battery cell at a first current value in a first time range, charging said battery cell at a second current value in a second time range thereafter, judging whether or not a current of said battery cell detected by said detection circuit is greater than a first current threshold value, and continuing to charge said battery cell at said first current value when said current of said battery cell is greater than said first current threshold value; wherein the first current value is greater than the second current value.

10. The apparatus to be charged according to claim 8, wherein said switching unit includes: the first MOS tube and the second MOS tube; the first electrode of the first MOS tube is connected with the battery unit through the first end, the first electrode of the second MOS tube is connected with the charging interface through the second end, the second electrode of the first MOS tube is connected with the second electrode of the second MOS tube, and the control electrode of the first MOS tube is connected with the control electrode of the second MOS tube; the control unit is also used for controlling the detection circuit to detect the conduction impedance of the first MOS tube and/or the second MOS tube, and controlling the driving circuit to drive the switch unit to be closed so as to stop charging the battery unit when the conduction impedance of the first MOS tube and/or the second MOS tube is larger than an impedance threshold.