WO2022105503A1 - Charging circuit, electronic device and charging apparatus - Google Patents

Abstract

A charging circuit and an electronic device, the charging circuit comprising: a control unit (110), a first charge pump unit (120) and a buck unit (130). The control unit (110) is used for detecting a charging mode in which a battery is charged, and outputting a charging control signal according to the charging mode; the first charge pump unit (120) is connected to the control unit (110) and a power supply terminal, and the first charge pump unit (120) has a shoot-through state and a buck state; the buck unit (130) is connected to the control unit (110), the first charge pump unit (120) and an output terminal, and the buck unit (130) has a shoot-through state and a buck state; the control unit (110) is configured to output, when the control unit (110) detects that the charging mode is a first preset mode, a charging control signal to control the first charge pump unit (120) to operate in a shoot-through state and control the buck unit (130) to operate in a buck state, and to output, when the control unit (110) detects that the charging mode is the second preset mode, the charging control signal to control the first charge pump unit (120) to operate in the buck state and control the buck unit (130) to operate in the buck state.

Description

Charging circuit, electronic equipment and charging device

cross reference

The present disclosure claims priority to Chinese patent application No. 202011309437.5, filed on November 20, 2020, and entitled "Charging Circuit and Electronic Device," the entire contents of which are incorporated herein by reference in their entirety.

technical field

The present disclosure relates to the technical field of electronic devices, and in particular, to a charging circuit, an electronic device, and a charging device.

Background technique

With the development and progress of technology, people have higher and higher requirements for the charging speed of electronic devices, so a variety of fast charging technologies are applied. At present, electronic equipment often needs to include a fast charging circuit and a general charging circuit. Usually, the fast charging circuit and the general charging circuit are set up separately, which leads to a large number of components required for charging in the electronic equipment. On the one hand, it is not conducive to the thinning of the electronic device, and on the other hand, the cost of the electronic device is relatively high.

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 form the prior art that is already known to a person of ordinary skill in the art.

public content

The purpose of the present disclosure is to provide a charging circuit, an electronic device, and a charging device, so as to solve one or more problems caused by the deficiencies of the related art at least to a certain extent.

According to a first aspect of the present disclosure, there is provided a charging circuit for a battery, the charging circuit comprising:

a control unit, configured to detect a charging mode for charging the battery, and output a charging control signal according to the charging mode;

a first charge pump unit, connected to the control unit and the power supply terminal, the first charge pump unit has a pass-through state and a step-down state;

a step-down unit, connected to the control unit, the first charge pump unit and the output end, the step-down unit has a pass-through state and a step-down state;

Wherein, the control unit is configured to, when the control unit detects that the charging mode is the first preset mode, the charging control signal controls the first charge pump unit to work in a pass-through state and controls the down The voltage unit works in a step-down state; when the control unit detects that the charging mode is the second preset mode, the charge control signal controls the first charge pump unit to work in a step-down state and controls the charge pump unit to work in a step-down state. The pressure unit works in a reduced state.

According to a second aspect of the present disclosure, there is provided an electronic device, the electronic device comprising:

The above charging circuit;

a battery, which is connected to the output end of the charging circuit.

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

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description serve to explain the principles of the disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

FIG. 1 is a schematic diagram of a first charging circuit provided by an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a second charging circuit provided by an exemplary embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a third charging circuit provided by an exemplary embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a fourth charging circuit provided by an exemplary embodiment of the present disclosure;

FIG. 5 is a control timing diagram of a first charge pump unit provided by an exemplary embodiment of the present disclosure;

FIG. 6 is a control timing diagram of a second charge pump unit provided by an exemplary embodiment of the present disclosure;

FIG. 7 is a schematic diagram of an electronic device according to an exemplary embodiment of the present disclosure.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be embodied in various forms and should not be construed as limited to the embodiments 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 same reference numerals in the drawings denote the same or similar parts, and thus their repeated descriptions will be omitted.

The block diagrams shown in the figures may be functional entities and do not necessarily necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, or in one or more software-hardened modules or parts of functional entities, or in different network and/or processor devices and/or microcontroller devices implement these functional entities.

Exemplary embodiments of the present disclosure first provide a charging circuit for charging a battery. As shown in FIG. 1 , the charging circuit includes: a control unit 110 , a first charge pump unit 120 and a step-down unit 130 . The control unit 110 is used for The charging mode of the battery is detected, and a charging control signal is output according to the charging mode of the battery; the first charge pump unit 120 is connected to the control unit 110 and the power supply terminal Vin, and the first charge pump unit 120 has a pass-through state and a step-down state; the step-down unit 130 is connected to the control unit 110, the first charge pump unit 120 and the output terminal Vout, and the step-down unit 130 has a pass-through state and a step-down state.

Wherein, the control unit 110 is configured to, when the control unit 110 detects that the charging mode of the battery is the first preset mode, the charging control signal controls the first charge pump unit 120 to work in a pass-through state and controls the step-down unit 130 to work in a step-down state state; when the control unit 110 detects that the charging mode of the battery is the second preset mode, the charging control signal controls the first charge pump unit 120 to work in the step-down state and controls the step-down unit 130 to work in the step-down state.

In the charging circuit provided by the embodiment of the present disclosure, when the charging mode is the first preset mode, the control unit 110 controls the first charge pump unit 120 to work in the pass-through state and controls the step-down unit 130 to work in the step-down state, and in the charging mode In the second preset mode, the control unit 110 controls the first charge pump unit 120 to work in a step-down state and controls the step-down unit 130 to work in a step-down state, that is, through the first charge pump unit 120 and the step-down unit 130 The battery can be charged in two modes. The first charge pump unit 120 and the step-down unit 130 are shared in the two charging modes, which reduces the number of devices in the charging circuit, thereby simplifying the charging circuit, which is beneficial to the thinning and lightening of electronic equipment. cost control.

Further, as shown in FIG. 2 , the charging circuit provided by the embodiment of the present disclosure may further include: a second charge pump unit 140 , a second charge pump unit 140 and a control unit 110 , a first charge pump unit 120 and a step-down unit 130 connected, the second charge pump unit 140 has a pass-through state and a step-down state; when the control unit 110 detects that the charging mode of the battery is the first preset mode and the second preset mode, the charging control signal controls the second charge pump unit 140 Works in the direct state; when the control unit 110 detects that the charging mode of the battery is the fifth preset mode, the charging control signal controls the first charge pump unit 120 to work in a step-down state, and controls the second charge pump unit 140 to work in a step-down state state and control the step-down unit 130 to be in the pass-through state.

The second charge pump unit 140 can realize the secondary step-down of the charging signal, thereby allowing a larger input voltage and increasing the charging mode that the charging circuit can support. The voltage difference between the input end and the output end of the step-down unit 130 can be reduced by reducing the voltage of the first charge pump unit 120 once or reducing the voltage of the second charge pump unit 140 twice, which is beneficial to improve the charging efficiency.

As shown in FIG. 3 , the charging circuit provided by the embodiment of the present disclosure may further include a direct charging unit 150, which is connected to the control unit 110, the first charge pump unit 120 and the output terminal. When the control unit 110 detects that the battery is in the In the sixth charging mode, the charging control signal controls the first charge pump unit 120 to work in the direct state, and controls the direct charging unit 150 to be turned on to output the charging signal.

Through the cooperation of the direct charging unit 150 and the first charge pump unit 120, the charging signal can be directly transmitted to the output end, so that the charging circuit can be compatible with the charging mode of low voltage and high current. And can improve the charging efficiency.

Each unit of the charging circuit provided by the embodiment of the present disclosure will be described in detail below:

The control unit 110 provided in this embodiment of the present disclosure may be a power management chip, a microprocessor, or a processor of an electronic device, or the like. The control unit 110 may also be configured to control the first charge pump unit 120 to work in a step-down state and control the step-down unit 130 to work in a pass-through state when the control unit 110 detects that the charging mode of the battery is the third preset mode. . When the control unit 110 detects that the charging mode of the battery is the fourth preset mode, the charging control signal controls the first charge pump unit 120 to work in the pass-through state and controls the step-down unit 130 to work in the pass-through state. The first charge pump unit 120 and the step-down unit 130 can realize four modes of charging. On the premise of taking into account multiple charging modes, the number of devices in the electronic device charging circuit is not increased, which is beneficial to the thinning and cost reduction of electronic devices. control.

When the charging circuit further includes the second charge pump unit 140, the control unit 110 may be further configured to: when the charging mode of the battery is the first preset mode, the second preset mode, the third charging mode and the fourth charging mode, The control unit 110 controls the output charging control signal to control the second charge pump unit 140 to work in a pass-through state. When the control unit 110 detects that the charging mode of the battery is the fifth preset mode, the charging control signal controls the first charge pump unit 120 to work in a step-down state, controls the second charge pump unit 140 to work in a step-down state, and controls the step-down state Unit 130 is in a pass-through state. When the control unit 110 detects that the charging mode of the battery is the seventh preset mode, the charging control signal controls the first charge pump unit 120 to work in a step-down state, controls the second charge pump unit 140 to work in a step-down state, and controls the step-down state Cell 130 is in a depressurized state.

When the charging circuit further includes the direct charging unit 150, the control unit 110 may also be configured to output a charging control signal to control the first charge pump unit 120 to work in the direct state when the charging mode of the battery is the sixth charging mode , and the direct charging unit 150 is controlled to be turned on to output the charging signal.

As shown in FIG. 4 , the first charge pump unit 120 includes: a first switch M1 , a second switch M2 , a third switch M3 , a fourth switch M4 , a first capacitor C1 and a second capacitor C2 . The first end of the first switch M1 is connected to the power supply end Vin, the control end of the first switch M1 is connected to the control unit 110 ; the first end of the second switch M2 is connected to the second end of the first switch M1 , and the control end of the second switch M2 connected to the control unit 110; the first end of the third switch M3 is connected to the second end of the second switch M2, the control end of the third switch M3 is connected to the control unit 110; the first end of the fourth switch M4 is connected to the first end of the third switch M3 Two terminals, the control terminal of the fourth switch M4 is connected to the control unit 110, and the second terminal is connected to the reference power terminal; the first terminal of the first capacitor C1 is connected to the second terminal of the first switch M1, and the second terminal of the first capacitor C1 is connected to The second terminal of the third switch M3; the first terminal of the second capacitor C2 is connected to the second terminal of the second switch M2, and the second terminal of the second capacitor C2 is connected to the reference power terminal.

Wherein, when the first charge pump unit 120 works in the through state, the first switch M1 and the second switch M2 are turned on, and the third switch M3 and the fourth switch M4 are turned off; the step-down state of the first charge pump unit 120 is step-down charge pump mode. The reference power terminal may be a fixed potential terminal, for example, the reference power terminal may be a ground terminal.

When the first charge pump unit 120 works in a step-down state:

In the writing phase, the control unit 110 controls the first switch M1 and the third switch M3 to be turned on, and controls the second switch M2 and the fourth switch M4 to be turned off to charge the first capacitor C1 and the second capacitor C2;

In the output stage, the control unit 110 controls the first switch M1 and the third switch M3 to be turned off, and controls the second switch M2 and the fourth switch M4 to be turned on, so as to output the reduced charging signal.

It should be noted that the writing stage refers to the stage of writing power signals to the first charge pump unit 120 , and the output stage refers to the stage that the first charge pump unit 120 outputs signals to the battery or subsequent circuits.

The first charge pump unit 120 will be described below with reference to the timing diagram shown in FIG. 5 , taking the example that the first switch M1 , the second switch M2 , the third switch M3 and the fourth switch M4 are N-type MOS transistors:

The charging control signal output by the control unit 110 may include a first sub-control signal S1, a second sub-control signal S2, a third sub-control signal S3 and a fourth sub-control signal S4. The first sub-control signal S1 is transmitted to the control terminal of the first MOS transistor, the second sub-control signal S2 is transmitted to the control terminal of the second MOS transistor, and the third sub-control signal S3 is transmitted to the control terminal of the third MOS transistor , the fourth sub-control signal S4 is transmitted to the control terminal of the fourth MOS transistor. The capacitances of the first capacitor C1 and the second capacitor C2 may be equal.

During the time period t1, the first charge pump unit 120 is in a pass-through state. At this time, the first sub-control signal S1 and the second sub-control signal S2 are at a high level, the first MOS transistor and the second MOS transistor are turned on, and the third sub-control signal S1 and the second sub-control signal S2 are at a high level. The control signal S3 and the fourth sub-control signal S4 are at a low level, and the third MOS transistor and the fourth MOS transistor are turned off. The charging signal received from the input terminal is transmitted to the second charge pump unit 140 through the first MOS transistor and the second MOS transistor.

During the time period t2, the first charge pump unit 120 is in the writing phase of the step-down state. At this time, the first sub-control signal S1 and the third sub-control signal S3 are at a high level, and the first MOS transistor and the third MOS transistor conduct On, the second sub-control signal S2 and the fourth sub-control signal S4 are at low level, the second MOS transistor and the fourth MOS transistor are turned off, at this time, the second capacitor C2 is charged to half the input voltage.

During the time period t3, the first charge pump unit 120 is in the output stage of the step-down state, at this time, the first sub-control signal S1 and the third sub-control signal S3 are at a low level, and the first MOS transistor and the third MOS transistor are turned off , the second sub-control signal S2 and the fourth sub-control signal S4 are at high level, the second MOS transistor and the fourth MOS transistor are turned on, at this time, the first capacitor C1 and the second capacitor C2 are connected in parallel to the reference voltage terminal, and the first The voltage of the second terminal of the two MOS transistors is one half of the input voltage, that is, the first charge pump unit 120 achieves one half of the voltage reduction.

It should be noted that, in the embodiment of the present disclosure, t1, t2, and t3 do not have a necessary sequence, t1, t2, and t3 do not overlap in time, and t2 is executed after t3.

The second charge pump unit 140 may include: a fifth switch M5, a sixth switch M6, a seventh switch M7, an eighth switch M8, a third capacitor C3 and a fourth capacitor C4. The first end of the fifth switch M5 is connected to the second end of the second switch M2 of the first charge pump unit 120 , the control end of the fifth switch M5 is connected to the control unit 110 ; the first end of the sixth switch M6 is connected to the fifth switch M5 The second end of the sixth switch M6 is connected to the control unit 110; the first end of the seventh switch M7 is connected to the second end of the sixth switch M6, and the control end of the seventh switch M7 is connected to the control unit 110; the eighth switch The first end of M8 is connected to the second end of the seventh switch M7, the control end of the eighth switch M8 is connected to the control unit 110, the second end of the eighth switch M8 is connected to the reference power supply end; the first end of the third capacitor C3 is connected to the The second end of the fifth switch M5, the second end of the third capacitor C3 is connected to the second end of the seventh switch M7; the first end of the fourth capacitor C4 is connected to the second end of the sixth switch M6, and the first end of the fourth capacitor C4 is connected to the second end of the sixth switch M6. The two terminals are connected to the reference power terminal;

The fifth switch M5 and the sixth switch M6 are turned on, and the seventh switch M7 and the eighth switch M8 are turned off when the second charge pump unit 140 works in the pass-through state; the step-down state of the second charge pump unit 140 is step-down charge pump mode.

When the second charge pump unit 140 works in the step-down state:

In the writing stage, the control unit 110 controls the fifth switch M5 and the seventh switch M7 to be turned on, and controls the sixth switch M6 and the eighth switch M8 to be turned off to charge the third capacitor C3 and the fourth capacitor C4;

In the output stage, the control unit 110 controls the fifth switch M5 and the seventh switch M7 to be turned off, and controls the sixth switch M6 and the eighth switch M8 to be turned on, so as to output the reduced charging signal.

It should be noted that the writing stage refers to the stage of writing power signals to the second charge pump unit 140 , and the output stage refers to the stage that the second charge pump unit 140 outputs signals to the battery or subsequent circuits.

The second charge pump unit 140 is described below by taking the fifth switch M5, the sixth switch M6, the seventh switch M7, and the eighth switch M8 as N-type MOS transistors as an example with reference to the timing diagram shown in FIG. 6:

The charging control signal output by the control unit 110 may further include a fifth sub-control signal S5, a sixth sub-control signal S6, a seventh sub-control signal S7 and an eighth sub-control signal S8. The fifth sub-control signal S5 is transmitted to the control terminal of the fifth MOS transistor, the sixth sub-control signal S6 is transmitted to the control terminal of the sixth MOS transistor, and the seventh sub-control signal S7 is transmitted to the control terminal of the seventh MOS transistor , the eighth sub-control signal S8 is transmitted to the control terminal of the eighth MOS transistor. The capacitances of the third capacitor C3 and the fourth capacitor C4 may be equal.

During the time period t1, the second charge pump unit 140 is in the pass-through state. At this time, the fifth sub-control signal S5 and the sixth sub-control signal S6 are at high level, the fifth MOS transistor and the sixth MOS transistor are turned on, and the seventh sub-control signal S5 and the sixth sub-control signal S6 are at a high level. The control signal S7 and the eighth sub-control signal S8 are at a low level, and the seventh MOS transistor and the eighth MOS transistor are turned off. The charging signal received from the first charge pump unit 120 is transmitted to the step-down unit 130 through the fifth MOS transistor and the sixth MOS transistor.

During the time period t2, the second charge pump unit 140 is in the writing phase of the step-down state. At this time, the fifth sub-control signal S5 and the seventh sub-control signal S7 are at high level, and the fifth MOS transistor and the seventh MOS transistor conduct On, the sixth sub-control signal S6 and the eighth sub-control signal S8 are at low level, the sixth MOS transistor and the eighth MOS transistor are off, at this time, the fourth capacitor C4 is charged to half the input voltage.

During the time period t3, the first charge pump unit 120 is in the output stage of the step-down state, at this time the fifth sub-control signal S5 and the seventh sub-control signal S7 are at low level, and the fifth MOS transistor and the seventh MOS transistor are turned off , the sixth sub-control signal S6 and the eighth sub-control signal S8 are at a high level, the sixth MOS transistor and the eighth MOS transistor are turned on, at this time, the third capacitor C3 and the fourth capacitor C4 are connected in parallel with the reference voltage terminal, the first The voltage of the second terminal of the six MOS transistors is one-half the input voltage, that is, the second charge pump unit 140 achieves one-half step-down.

The direct charging unit 150 is connected to the control unit 110, the first charge pump unit 120 and the output terminal. When the control unit 110 detects that the battery is in the sixth charging mode, the charging control signal controls the first charge pump unit 120 to work in the direct state, and The direct charging unit 150 is controlled to be turned on to output the charging signal.

The direct charging unit 150 includes a ninth switch M9 , a first terminal of the ninth switch M9 is connected to the second terminal of the first switch M1 , a second terminal of the ninth switch M9 is connected to the output terminal Vout, and the control terminal is connected to the control unit 110 . When the control unit 110 detects that the battery is in the sixth preset mode, the control unit 110 controls the first switch M1 and the second switch M2 to be turned on, and controls the remaining switches to be turned off.

The ninth switch M9 may include a ninth MOS transistor, and the ninth MOS transistor may be an N-type MOS transistor. At this time, the control unit 110 outputs the ninth sub-control signal S9, and the ninth sub-control signal S9 is transmitted to the control terminal of the ninth MOS transistor. When the battery charging mode is the sixth preset mode, the first sub-control signal S1 and the ninth sub-control signal S9 are at a high level, the first MOS transistor and the ninth MOS transistor are turned on, and the remaining sub-control signals are at a low level , the rest of the MOS transistors are turned off. The charging signal input from the power supply terminal Vin is transmitted to the output terminal Vout through the first MOS transistor and the ninth MOS transistor.

The step-down unit 130 includes: a tenth switch M10, an eleventh switch M11, an inductor L and a fifth capacitor C5. The first end of the tenth switch M10 is connected to the first charge pump unit 120, the control end of the tenth switch M10 is connected to the control unit 110; the first end of the eleventh switch M11 is connected to the second end of the tenth switch M10, and the eleventh switch M11 is connected to the second end of the tenth switch M10. The second end of the switch M11 is connected to the reference power supply end; the first end of the inductor L is connected to the second end of the tenth switch M10, the second end of the inductor L is connected to the output end Vout; the first end of the fifth capacitor C5 is connected to The output terminal Vout, the second terminal of the fifth capacitor C5 is connected to the reference power terminal.

When the step-down unit 130 works in the through state, the tenth switch M10 is turned on, the eleventh switch M11 is turned off, and the charging signal input by the step-down unit 130 is directly output at this time.

When the step-down unit 130 is in a step-down state, in the first stage, the tenth switch M10 is turned on, the eleventh switch M11 is turned off, and both the inductor L and the fifth capacitor C5 are charged; in the second stage, the tenth switch M10 is turned off, and the first switch M10 is turned off. The eleventh switch M11 is turned on, and the fifth capacitor C5 and the inductor L are discharged.

The tenth switch M10 may include a tenth MOS transistor, the eleventh switch M11 may include an eleventh MOS transistor, and the tenth MOS transistor and the eleventh MOS transistor may be N-type MOS transistors.

The control unit 110 can also output the tenth sub-control signal S10 and the eleventh sub-control signal S11, the tenth sub-control signal S10 is transmitted to the control terminal of the tenth MOS transistor, and the eleventh sub-control signal S11 is transmitted to the tenth sub-control signal S11. A control terminal of a MOS tube.

When the step-down unit 130 works in the straight-through state, the tenth sub-control signal S10 is always at a high level, the tenth MOS transistor is normally open, the eleventh sub-control signal S11 is always at a low level, and the eleventh MOS transistor is normally closed, At this time, the charging signal input by the step-down unit 130 is directly output.

When the step-down unit 130 is in a step-down state, in the first stage, the tenth sub-control signal S10 is at a high level, the tenth MOS transistor is turned on, the eleventh sub-control signal S11 is at a low level, and the eleventh MOS transistor is turned off In the second stage, the tenth sub-control signal S10 is at the first level, the tenth MOS transistor is turned off, the eleventh sub-control signal S11 is at a high level, and the eleventh sub-control signal S11 is at a high level. The MOS transistor is turned on, and the fifth capacitor C5 and the inductor L are discharged.

It should be noted that in the above specific embodiments, all MOS transistors are N-type MOS transistors; however, those skilled in the art can easily obtain a charging circuit in which all MOS transistors are P-type transistors according to the charging circuit provided in the present disclosure. Each switch in the embodiment of the present disclosure uses a MOS transistor as an example for description. In practical applications, each switch may also be a thin film transistor or a field effect transistor, etc., and the embodiment of the present disclosure is not limited thereto. Each MOS transistor has a control end, a first end and a second end. Specifically, the control terminal of each MOS tube may be the gate, the first terminal may be the source, and the second terminal may be the drain; or, the control terminal of each MOS tube may be the gate, and the first terminal may be the drain , the second terminal can be the source. In addition, each MOS transistor may also be an enhancement type transistor or a depletion type transistor, which is not specifically limited in this exemplary embodiment.

The charging circuit provided by the embodiment of the present disclosure may be a wired charging circuit or a wireless charging circuit. When the charging circuit is a wired charging circuit, the power terminal Vin may be a charging interface (for example, a micro-USB interface or a type-c interface), and the charging interface is used to connect an adapter. When the charging circuit is a wireless charging circuit, the power terminal Vin may be a wireless charging receiving module, and the wireless charging receiving module may include a receiving coil, a rectifier, and the like. The electromagnetic signal emitted by the transmitter is received through the receiving coil, converted into alternating current, and the alternating current is converted into direct current through the rectifier.

The control unit 110 can determine the charging mode of the electronic device according to the charging protocol of the adapter and the voltage of the power terminal Vin. For example, when the voltage received by the power terminal Vin is 5V, the control unit 110 determines that the charging mode of the battery is the first preset mode. (Universal charging); when the voltage received by the power terminal Vin is 12V, the control unit 110 determines that the charging mode of the battery is the second preset mode (PD or QC charging protocol); when the voltage received by the power terminal Vin is 9.2V , the control unit 110 determines that the charging mode of the battery is the third preset mode; when the voltage received by the power terminal Vin is 4.6V, the control unit 110 determines that the charging mode of the battery is the fourth preset mode. When the voltage received by the power terminal Vin is 12V-20V, the control unit 110 determines that the charging mode of the battery is the fifth preset mode (wireless fast charging). Of course, the control unit 110 can also determine the charging mode according to the current of the signal at the power terminal Vin. When the current at the power terminal Vin is greater than the preset threshold and the voltage is less than the preset threshold, the charging mode of the battery is the sixth preset mode (VOOC or PPS charging). protocol).

For example, when the battery is a single cell (battery voltage <4.6V): the input voltage is Vin.

When Vin=5V (general charge), the input voltage is the closest to the battery voltage at this time, and the direct conversion and charging efficiency of the step-down unit 130 is the highest, so at this time M1, M2, M5, M6 remain open, M3, M4, M7 , M8 is kept in a closed state, and part of the step-down unit 130 is working.

When Vin=12V (PD or QC), at this time, the first charge pump unit 120 or the second charge pump unit 140 is used to divide the voltage by 1/2, and then the voltage is charged by the step-down unit 130. At this time, the charging efficiency is maximized .

When 12V<Vin<20V (wireless fast charging), the first charge pump unit 120 and the second charge pump unit 140 work at the same time, divide Vin by 1/4, and the step-down unit 130 works in Bypass mode (M10 always On, M11 is normally off), to keep the charging efficiency to the maximum.

When VOOC (or pps charging) is charging, M1 and M9 are kept normally open, and other MOSs are kept closed to achieve direct charging and maximize efficiency.

Of course, in practical applications, the charging circuit provided by the embodiment of the present disclosure can also be used for charging a multi-cell battery, and the embodiment of the present disclosure is not limited thereto.

In the charging circuit provided by the embodiment of the present disclosure, when the charging mode is the first preset mode, the control unit 110 controls the first charge pump unit 120 to work in the pass-through state and controls the step-down unit 130 to work in the step-down state, and in the charging mode In the second preset mode, the control unit 110 controls the first charge pump unit 120 to work in a step-down state and controls the step-down unit 130 to work in a step-down state, that is, through the first charge pump unit 120 and the step-down unit 130 The battery can be charged in two modes. The first charge pump unit 120 and the step-down unit 130 are shared in the two charging modes, which reduces the number of devices in the charging circuit, thereby simplifying the charging circuit, which is beneficial to the thinning and lightening of electronic equipment. cost control. And can improve charging efficiency.

An exemplary embodiment of the present disclosure further provides an electronic device, as shown in FIG. 7 , the electronic device includes: the above-mentioned charging circuit 100 and a battery 40 , and the battery 40 is connected to the output terminal Vout of the charging circuit 100 .

The electronic device provided by the embodiment of the present disclosure may be an electronic device that needs to be charged, such as a mobile phone, a tablet computer, a wearable device, a navigator, an electronic reader, a power bank, a car computer, or a notebook computer.

The electronic device provided by the embodiment of the present disclosure is exemplarily described below by taking the electronic device as a mobile phone as an example:

The electronic device provided by the embodiment of the present disclosure further includes a display screen 10 , a frame 20 , a main board 30 , and a back cover 50 . Wherein, the display screen 10 is installed on the frame 20 to form the display surface of the terminal device, and the display screen 10 serves as the front shell of the electronic device. The back cover 50 is pasted on the frame by double-sided tape, and the display screen 10 , the frame 20 and the back cover 50 form an accommodation space for accommodating other electronic components or functional modules of the electronic device. Meanwhile, the display screen 10 forms a display surface of the electronic device, and is used to display information such as images and texts. The display screen 10 may be a liquid crystal display (Liquid Crystal Display, LCD) or an organic light-emitting diode display (Organic Light-Emitting Diode, OLED) and other types of display screens.

A glass cover plate may be provided on the display screen 10 . The glass cover can cover the display screen 10 to protect the display screen 10 and prevent the display screen 10 from being scratched or damaged by water.

The display screen 10 may include a display area 11 and a non-display area 12 . Among them, the display area 11 performs the display function of the display screen 10 for displaying information such as images and texts. The non-display area 12 does not display information. The non-display area 12 can be used to set functional modules such as cameras, receivers, and proximity sensors. In some embodiments, the non-display area 12 may include at least one area located at the upper and lower parts of the display area 11 .

The display screen 10 may be a full screen. At this time, the display screen 10 can display information in a full screen, so that the electronic device has a larger screen ratio. The display screen 10 includes only the display area 11 and does not include the non-display area. At this time, functional modules such as cameras and proximity sensors in the electronic device can be hidden under the display screen 10, and the fingerprint recognition module of the electronic device can be arranged on the back of the electronic device.

The frame 20 may be a hollow frame structure. The material of the frame 20 may include metal or plastic. The main board 30 is installed inside the above-mentioned accommodation space. For example, the main board 30 can be installed on the frame 20 and accommodated in the above-mentioned accommodation space together with the frame 20 . The main board 30 is provided with a ground point to realize the grounding of the main board 30 . The main board 30 may be integrated with one or more functional modules such as a motor, a microphone, a speaker, a receiver, a headphone interface, a universal serial bus interface (USB interface), a camera, a proximity sensor, an ambient light sensor, a gyroscope, and a processor. . Meanwhile, the display screen 10 may be electrically connected to the main board 30 .

The main board 30 is provided with a display control circuit. The display control circuit outputs electrical signals to the display screen 10 to control the display screen 10 to display information.

The battery 40 is installed inside the above-mentioned accommodation space. For example, the battery 40 can be mounted on the frame 20 and housed in the above-mentioned storage space together with the frame 20 . The battery 40 may be electrically connected to the main board 30 to enable the battery 40 to supply power to the electronic device. The mainboard 30 may be provided with a power management circuit. The power management circuit is used to distribute the voltage provided by the battery 40 to the various electronic components in the electronic device.

The back cover 50 is used to form the outer contour of the electronic device. The rear cover 50 may be integrally formed. During the molding process of the back cover 50 , structures such as a rear camera hole, a fingerprint identification module mounting hole and the like may be formed on the back cover 50 .

The charging circuit 100 provided by the embodiment of the present disclosure may be provided on the main board 30 , and the charging circuit 100 is connected to the battery 40 . When the charging circuit 100 is a wireless charging circuit, the power terminal Vin of the charging circuit is connected to the wireless charging receiving unit; when the charging circuit 100 is a wired charging circuit, the power terminal Vin of the charging circuit is connected to the charging interface. An electronic device may have both a wireless charging function and a wired charging function. In this case, the charging circuit 100 may include a switching circuit that switches and connects the charging interface and the wireless charging receiving unit.

In the electronic device provided by the embodiment of the present disclosure, when the charging mode is the first preset mode, the control unit 110 controls the first charge pump unit to work in the direct state and controls the step-down unit 130 to work in the step-down state, and the charging mode is: In the second preset mode, the control unit 110 controls the first charge pump unit 120 to work in a step-down state and controls the step-down unit 130 to work in a step-down state, that is, through the first charge pump unit 120 and the step-down unit 130 ie The battery can be charged in two modes. The first charge pump unit 120 and the step-down unit 130 are shared in the two charging modes, which reduces the number of components in the charging circuit, thereby simplifying the charging circuit, which is beneficial to the thinning and cost of electronic equipment. control.

Exemplary embodiments of the present disclosure also provide a charging device, which includes the above-mentioned charging circuit 100 .

The charging device may be an adapter or a wireless charging base. When the charging device is an adapter, the adapter may further include a connection interface, the connection interface is connected with the charging circuit 100, and the connection interface is used for connecting the electronic device to be charged.

When the charging device is a wireless charging base, the wireless charging base further includes a wireless charging transmitter unit, the wireless charging transmitter unit is connected to the charging circuit 100, and the wireless charging transmitter unit is used for transmitting electromagnetic signals.

In the charging device provided by the embodiment of the present disclosure, when the charging mode is the first preset mode, the control unit 110 controls the first charge pump unit to work in the direct state and controls the step-down unit 130 to work in the step-down state, and the charging mode is: In the second preset mode, the control unit 110 controls the first charge pump unit 120 to work in a step-down state and controls the step-down unit 130 to work in a step-down state, that is, through the first charge pump unit 120 and the step-down unit 130 ie The battery can be charged in two modes, and the first charge pump unit 120 and the step-down unit 130 are shared in the two charging modes, which reduces the number of components in the charging circuit, thereby simplifying the charging circuit.

Other embodiments of the present disclosure will readily suggest themselves to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or techniques in the technical field not disclosed by the present disclosure . The specification and examples are to be regarded as exemplary only, with the true scope and spirit of the disclosure being indicated by the claims.

It is to be understood that the present disclosure is not limited to the precise structures described above and illustrated in the accompanying drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (20)

1. A charging circuit for charging a battery, the charging circuit comprising:

   a control unit, configured to detect a charging mode for charging the battery, and output a charging control signal according to the charging mode;

   a first charge pump unit, connected to the control unit and the power supply terminal, the first charge pump unit has a pass-through state and a step-down state;

   a step-down unit, connected to the control unit, the first charge pump unit and the output end, the step-down unit has a pass-through state and a step-down state;

   Wherein, the control unit is configured to, when the control unit detects that the charging mode is the first preset mode, the charging control signal controls the first charge pump unit to work in a pass-through state and controls the down The voltage unit works in a step-down state; when the control unit detects that the charging mode is the second preset mode, the charge control signal controls the first charge pump unit to work in a step-down state and controls the charge pump unit to work in a step-down state. The pressure unit works in a reduced state.
2. The charging circuit of claim 1, the first charge pump unit comprising:

   a first switch, the first end is connected to the power supply end, and the control end is connected to the control unit;

   a second switch, the first end is connected to the second end of the first switch, and the control end is connected to the control unit;

   a third switch, the first end is connected to the second end of the second switch, and the control end is connected to the control unit;

   a fourth switch, the first terminal is connected to the second terminal of the third switch, the control terminal is connected to the control unit, and the second terminal is connected to the reference power terminal;

   a first capacitor, the first terminal is connected to the second terminal of the first switch, and the second terminal is connected to the second terminal of the third switch;

   For the second capacitor, the first terminal is connected to the second terminal of the second switch, and the second terminal is connected to the reference power terminal.
3. The charging circuit according to claim 2, wherein when the first charge pump unit operates in a pass-through state, the first switch and the second switch are turned on, and the third switch and the fourth switch are turned off.
4. The charging circuit according to claim 2, when the first charge pump unit works in a step-down state:

   In the writing stage, the control unit controls the first switch and the third switch to be turned on, and controls the second switch and the fourth switch to be turned off, so as to charge the first capacitor and the second capacitor;

   In the output stage, the control unit controls the first switch and the third switch to be turned off, and controls the second switch and the fourth switch to be turned on, so as to output the reduced charging signal.
5. The charging circuit of claim 1, wherein the control unit is further configured to, when the control unit detects that the charging mode of the battery is a third preset mode, the charging control signal controls the first charge The pump unit works in a depressurized state and controls the depressurization unit to work in a straight-through state.
6. The charging circuit of claim 1, wherein the control unit is further configured to, when the control unit detects that the charging mode of the battery is a fourth preset mode, the charging control signal controls the first charge The pump unit works in a straight-through state and controls the step-down unit to work in a straight-through state.
7. The charging circuit of claim 1, further comprising:

   A second charge pump unit is connected to the control unit, the first charge pump unit and the step-down unit, and the second charge pump unit has a pass-through state and a step-down state.
8. The charging circuit according to claim 7, when the control unit detects that the charging mode of the battery is a first preset mode and a second preset mode, the charging control signal controls the second charge The pump unit works in a direct state; when the control unit detects that the charging mode of the battery is the fifth preset mode, the charging control signal controls the first charge pump unit to work in a step-down state, and controls the second The charge pump unit works in a step-down state and controls the step-down unit to be in a pass-through state.
9. The charging circuit of claim 8, the second charge pump unit comprising:

   a fifth switch, the first end is connected to the first charge pump unit, and the control end is connected to the control unit;

   a sixth switch, the first end is connected to the second end of the fifth switch, and the control end is connected to the control unit;

   a seventh switch, the first end is connected to the second end of the sixth switch, and the control end is connected to the control unit;

   an eighth switch, the first terminal is connected to the second terminal of the seventh switch, the control terminal is connected to the control unit, and the second terminal is connected to the reference power terminal;

   a third capacitor, the first end of which is connected to the second end of the fifth switch, and the second end is connected to the second end of the seventh switch;

   In the fourth capacitor, the first terminal is connected to the second terminal of the sixth switch, and the second terminal is connected to the reference power terminal.
10. The charging circuit according to claim 9, wherein when the second charge pump unit operates in a pass-through state, the fifth switch and the sixth switch are turned on, and the seventh switch and the eighth switch are turned off.
11. The charging circuit according to claim 10, when the second charge pump unit works in a step-down state:

    In the writing stage, the control unit controls the fifth switch and the seventh switch to be turned on, and controls the sixth switch and the eighth switch to be turned off, so as to charge the third capacitor and the fourth capacitor;

    In the output stage, the control unit controls the fifth switch and the seventh switch to be turned off, and controls the sixth switch and the eighth switch to be turned on, so as to output a reduced charging signal.
12. The charging circuit of claim 1, further comprising:

    The direct charging unit is connected to the control unit, the first charge pump unit and the output end. When the control unit detects that the battery charging mode is the sixth preset mode, the charging control signal controls The first charge pump unit works in a direct state, and controls the direct charging unit to be turned on to output a charging signal.
13. The charging circuit of claim 12, the direct charging unit comprising:

    The ninth switch has a first end connected to the first charge pump unit, a second end connected to the output end, and a control end connected to the control unit.
14. The charging circuit of claim 1, wherein the step-down unit comprises:

    The tenth switch, the first end is connected to the first charge pump unit, and the control end is connected to the control unit;

    the eleventh switch, the first terminal is connected to the second terminal of the tenth switch, and the second terminal is connected to the reference power terminal;

    an inductor, the first end is connected to the second end of the tenth switch, and the second end is connected to the output end;

    The fifth capacitor, the first terminal is connected to the output terminal, and the second terminal is connected to the reference power terminal.
15. An electronic device comprising the charging circuit according to any one of claims 1-14.
16. According to the electronic device of claim, the power supply terminal in the charging circuit is a charging interface or a wireless charging receiving unit.
17. The electronic device of claim 16, further comprising:

    a battery, which is connected to the output end of the charging circuit.
18. A charging device comprising the charging circuit according to any one of claims 1-14.
19. The charging device of claim 18, wherein the charging device is an adapter, the adapter further comprising:

    a connection interface, the connection interface is connected with the charging circuit, and the connection interface is used for connecting the electronic device to be charged.
20. The charging device according to claim 18, wherein the charging device is a wireless charging base, and the wireless charging base further comprises:

    A wireless charging and transmitting unit, the wireless charging and transmitting unit is connected with the charging circuit, and the wireless charging and transmitting unit is used for transmitting electromagnetic signals.

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