CN116846008A

CN116846008A - Charging circuit, charging method, chip and electronic equipment

Info

Publication number: CN116846008A
Application number: CN202310646313.3A
Authority: CN
Inventors: 王宁宁
Original assignee: Xi'an Xinhai Microelectronics Technology Co ltd
Current assignee: Xi'an Xinhai Microelectronics Technology Co ltd
Priority date: 2023-06-01
Filing date: 2023-06-01
Publication date: 2023-10-03

Abstract

The application relates to the technical field of charging, and provides a charging circuit, a charging method, a chip and electronic equipment. The charging method comprises the steps that when the battery is in an overdischarge state, a charging activation module activates the battery according to the input power supply to charge the battery; when the battery is in a non-overdischarge state, the charging control module controls the charging state of the battery according to the control signal, so that the activation of the overdischarge battery can be realized, the effect of low cost and small circuit layout pressure can be achieved, and the problem that the battery cannot be used normally due to overdischarge can be solved.

Description

Charging circuit, charging method, chip and electronic equipment

Technical Field

The application relates to the technical field of charging, in particular to a charging circuit, a charging method, a chip and electronic equipment.

Background

With the rapid development of electronic science and technology, various electronic products are continuously updated, portability is higher and higher, and lithium batteries serving as power supplies are always kept away from portable electronic equipment. But lithium batteries cannot be overcharged. In an application scenario, if the portable electronic device is not used for a long time, the residual battery capacity can be completely discharged, and finally the battery is excessively discharged, so that the electronic device cannot be used normally, and the user experience is affected.

Current charging schemes for portable electronic devices fall broadly into two categories: the first type is linear charging, which is relatively low in cost, but has a small charging current, resulting in a long charging time. The second type is a switching power supply charging, which is relatively costly, but with a large charging current.

Disclosure of Invention

In view of the above problems, embodiments of the present application provide a charging circuit, a charging method, a chip, and an electronic device, so as to solve the above technical problems.

In a first aspect, an embodiment of the present application provides a charging circuit, including:

the power supply input end is used for receiving an input power supply;

the power supply output end is used for connecting with the anode of the battery;

the signal input end is used for connecting with the main control unit to receive the control signal output by the main control unit;

the charging activation module is connected with the power input end and the power output end and is used for activating the battery according to the input power to charge the battery when the battery is in an overdischarge state;

and the charging control module is connected with the charging activation module and the signal input end and is used for controlling the charging state of the battery according to the control signal when the battery is in a non-overdischarge state.

The embodiment can realize the activation of the overdischarge cell and the control of the charging current and the charging voltage, and has low cost and small circuit layout pressure.

Optionally, the charging activation module further includes:

the first current limiting unit is connected with the power input end;

the first switch unit is respectively connected with the power input end, the first current limiting unit and the power output end;

when the first switch unit is closed, the connection between the power input end and the power output end is conducted so that the input power charges the battery; when the first switch unit is turned off, the connection between the power input end and the power output end is disconnected.

According to the embodiment, when the battery is in the over-discharge state, battery activation and control of activation current can be realized, and the battery is prevented from being damaged due to the overlarge current in the activation process.

Optionally, the charging control module further includes:

the second current limiting unit is connected with the signal input end;

the third current limiting unit is connected with the first current limiting unit and the first switch unit;

the second switch unit is connected with the signal input end through the second current limiting unit and is connected with the first switch unit through the third current limiting unit.

The embodiment can realize the control of the charging current and the charging voltage, can avoid the overlong charging time caused by the small charging current and can also avoid the damage of the battery caused by the overlarge charging current.

Optionally, the charging circuit further comprises: and one end of the voltage division module is connected with the first switch unit and the power output end, and the other end of the voltage division module is connected with the second switch unit and the second current limiting unit.

The embodiment can realize the control of the activation current, and ensure that the battery is not damaged due to overlarge current in the activation process.

Optionally, the voltage dividing module further includes:

one end of the first voltage division unit is connected with the first switch unit and the power output end, and the other end of the first voltage division unit is connected with the second switch unit and the second current limiting unit;

the second voltage division unit is connected with the first voltage division unit, the second switch unit and the second current limiting unit.

Optionally, the charging circuit further comprises:

the detection module is connected with the power input end and the charging activation module and is used for detecting a power signal of the power input end;

the signal output end is connected with the detection module and the main control unit and is used for transmitting the power supply signal to the main control unit so that the main control unit outputs a control signal according to the power supply signal.

This embodiment is capable of controlling the enabling and disabling of battery charging.

Optionally, the detection module further comprises:

one end of the third voltage division unit is connected with the power input end and the charging activation module, and the other end of the third voltage division unit is connected with the signal output end;

and one end of the fourth voltage division unit is connected with the third voltage division unit and the signal output end, and the other end of the fourth voltage division unit is grounded.

Optionally, the charging system further comprises a first filtering module, wherein the first filtering module is connected with the power supply output end and the output of the charging activation module.

This embodiment enables filtering out noise generated by the charging circuit due to the switching unit from the charging control module.

Optionally, the power supply further comprises a filtering rectification module, and the filtering rectification module is connected with the power supply input end.

This embodiment is capable of filtering out input power noise and adjusting the input power to the proper input.

Optionally, the power supply further comprises a second filtering module, and the second filtering module is connected with the power supply input end and the output of the filtering rectification module.

This embodiment can store the power from the filter rectifying module and provide it to the post-stage charging circuit, or filter out the power noise supplied directly by the dc adapter.

In a second aspect, an embodiment of the present application provides a charging method, including:

when the battery is in an overdischarge state, the charging activation module is controlled to activate the battery according to an input power supply so as to charge the battery;

when the battery is in a non-overdischarge state, the working state of the charging control module is controlled according to the control signal so as to control the charging state of the battery.

The embodiment can realize the activation of the overdischarge cell and the charging state of the battery, and has low cost and small circuit layout pressure.

Optionally, when the battery is in the over-discharge state, controlling the charging activation module to activate the battery according to the input power source to charge the battery further includes:

when the battery is in an overdischarge state, if the first switch unit is closed, the connection between the power input end and the power output end is conducted to activate the battery, so that the input power source charges the battery.

According to the embodiment, when the battery is in the over-discharge state, the control of the activation current can be realized, and the battery is prevented from being damaged due to the excessive current in the activation process.

Optionally, when the battery is in a non-overdischarge state, controlling the working state of the charging control module according to the control signal, so as to control the charging state of the battery includes:

If the control signal is a PWM signal, the working state of the charging control module is controlled according to the PWM signal so as to control the charging current and/or the charging voltage of the battery;

if the control signal is a level signal, the working state of the charging control module is controlled according to the level signal so as to control the charging enable and the charging closing of the battery.

This embodiment enables control of the charging current, the charging voltage, the charging enable, and the charging off.

Optionally, controlling the working state of the charging control module according to the PWM signal to control the charging current and/or the charging voltage of the battery includes:

adjusting the switching frequency of the second switching unit according to the duty ratio corresponding to the PWM signal;

the switching frequency of the first switching unit is adjusted according to the switching frequency of the second switching unit to adjust the charging current and/or the charging voltage.

The embodiment can realize the control of the charging current and/or the charging voltage, can avoid the overlong charging time caused by the small charging current and can also avoid the damage of the battery caused by the overlarge charging current.

Optionally, the controlling the working state of the charging control module according to the level signal to control the charging enable and the charging close of the battery includes:

If the level signal is a high level signal, the second switch unit is turned on, the first switch unit is turned off, and the connection between the power input end and the power output end is disconnected, so that the battery is charged and turned off.

If the level signal is a low level signal, the second switch unit is turned off, the first switch unit is turned on, and the connection between the power input end and the power output end is turned on, so that the battery is enabled to be charged.

This embodiment can control battery charge enable and charge off.

Optionally, the charging method further comprises:

in the process of activating the battery, acquiring the current amplification factor of the second switch unit and acquiring the resistance value adjusting proportion of the first voltage dividing unit and the second voltage dividing unit;

controlling the output current of the second switch unit according to the resistance value adjusting proportion and the current amplification factor;

and controlling the current level of the battery to be activated according to the output current level.

In a third aspect, an embodiment of the present application further provides a chip, including the charging circuit and/or the charging method described above.

In a fourth aspect, an embodiment of the present application further provides an electronic device, including the chip described above.

The charging circuit, the charging method, the chip and the electronic equipment provided by the embodiment of the application can solve the problem that the battery cannot be used normally due to overdischarge, and when the battery is in an overdischarge state, the charging activation module is controlled to activate the battery according to the input power supply so as to charge the battery; when the battery is in a non-overdischarge state, the working state of the charging control module is controlled according to the control signal so as to control the charging state of the battery, so that the activation of the overdischarge cell can be realized, and the battery has the effects of low cost and small circuit layout pressure.

These and other aspects of the application will be more readily apparent from the following description of the embodiments.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a schematic structural diagram of a portable electronic device according to an embodiment of the present application.

Fig. 2 is a schematic diagram of a charging circuit according to an embodiment of the application.

Fig. 3 is a schematic structural diagram of a charging activation module according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a charging activation module according to another embodiment of the present application.

Fig. 5 is a schematic structural diagram of a charge control module according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a charge control module according to another embodiment of the present application.

Fig. 7 is a schematic structural diagram of a charging circuit according to another embodiment of the present application.

Fig. 8 is a schematic structural diagram of a voltage dividing module according to an embodiment of the application.

Fig. 9 is a schematic structural diagram of a voltage dividing module according to another embodiment of the present application.

Fig. 10 is a graph showing the relationship among the base current Ib, the collector current Ic, and the voltage Vce between the collector and the emitter of the transistor Q1 and the transistor Q2 according to the embodiment of the present application.

Fig. 11 is a schematic diagram illustrating a charging circuit according to another embodiment of the present application.

Fig. 12 is a schematic structural diagram of a detection module according to an embodiment of the present application.

Fig. 13 is a schematic structural diagram of a detection module according to another embodiment of the present application.

Fig. 14 is a schematic diagram showing a structure of a charging circuit according to another embodiment of the present application.

Fig. 15 is a schematic structural diagram of a first filtering module according to an embodiment of the application.

Fig. 16 is a schematic diagram illustrating a charging circuit according to another embodiment of the present application.

Fig. 17 is a schematic structural diagram of a filtering rectification module according to an embodiment of the application.

Fig. 18 is a schematic diagram showing a structure of a charging circuit according to another embodiment of the present application.

Fig. 19 is a schematic structural diagram of a second filtering module according to an embodiment of the application.

Fig. 20 is a schematic flow chart of a charging method according to an embodiment of the application.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present application and are not to be construed as limiting the present application.

In order to enable those skilled in the art to better understand the solution of the present application, the following description will make clear and complete descriptions of the technical solution of the present application in the embodiments of the present application with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

In the embodiments of the present application, it should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In describing embodiments of the present application, words such as "exemplary" or "such as" are used to mean illustrated, described, or described. Any embodiment or design described as "exemplary" or "such as" in an embodiment of the application is not necessarily to be construed as preferred or advantageous over another embodiment or design. The use of words such as "example" or "such as" is intended to present relative concepts in a clear manner.

In addition, the term "plurality" in the embodiments of the present application means two or more, and in view of this, the term "plurality" may be understood as "at least two" in the embodiments of the present application. "at least one" may be understood as one or more, for example as one, two or more. For example, including at least one means including one, two or more, and not limiting what is included, e.g., including at least one of A, B and C, then A, B, C, A and B, A and C, B and C, or A and B and C, may be included.

It should be noted that, in the embodiment of the present application, "and/or" describe the association relationship of the association object, which means that three relationships may exist, for example, a and/or B may be represented: a exists alone, A and B exist together, and B exists alone. The character "/", unless otherwise specified, generally indicates that the associated object is an "or" relationship.

It should be noted that in embodiments of the present application, "connected" may be understood as electrically connected, and two electrical components may be connected directly or indirectly between the two electrical components. For example, a may be directly connected to B, or indirectly connected to B via one or more other electrical components.

The first pole/first end of each transistor employed in the embodiments of the present application is one of the source and the drain, and the second pole/second end of each transistor is the other of the source and the drain. Since the source and drain of the transistor may be symmetrical in structure, the source and drain may be indistinguishable in structure, that is, the first pole/first terminal and the second pole/second terminal of the transistor in embodiments of the present application may be indistinguishable in structure. Illustratively, in the case where the transistor is a P-type transistor, the first pole/first terminal of the transistor is the source and the second pole/second terminal is the drain; illustratively, in the case where the transistor is an N-type transistor, the first pole/first terminal of the transistor is the drain and the second pole/second terminal is the source.

The charging circuit 200 provided by the embodiment of the application can be applied to the portable electronic device 300 shown in fig. 1, wherein the electronic device 300 at least can comprise a rechargeable battery 301 and a main control unit 302, wherein the rechargeable battery 301 is connected with the charging circuit 200, the battery 301 is used for providing electric energy required by normal operation of the electronic device, and the main control unit 302 can be a main control chip and is used for generating a control signal for controlling the charging circuit 200. The control signal may include at least a level signal for controlling charge enable and charge off of the charging circuit 200 and a PWM (Pulse Width Modulation ) signal for controlling a charging current and/or a charging voltage. The charging circuit 200 may receive an input power of an external power supply device and perform charging control of the battery 301 according to a control signal output from the main control unit.

In one application scenario, the battery 301 supports linear charging, but the charging current is small, resulting in a longer charging time. In another application scenario, the battery 301 supports switching power supply charging, but the charging current is large, which easily leads to damage of the battery 301. In the above application scenario, the linear charging and the switching power supply charging are applied to the portable electronic device, and the cost is high and the circuit layout pressure is high. In another application scenario, if the portable electronic device 300 is not used for a long time, the remaining battery power will be completely discharged, and finally the battery 301 is overdischarged (the positive voltage of the battery 301 is 0V), so that the electronic device cannot be used normally, and the user experience is affected. The charging circuit 200 and the charging method thereof provided by the embodiment of the application can solve the problems brought by the application scenes.

As shown in fig. 2, the charging circuit 200 includes a power input terminal 10, a power output terminal 20, a signal input terminal 30, a charging activation module 40, and a charging control module 50. The power input terminal 10 may be connected to a power supply device external to the electronic device 300, and is configured to receive an input power provided by the power supply device. The power output terminal 20 is connected to the positive electrode of the battery 301, and is used for outputting an input power to the battery 301. The signal input end 30 is connected to the main control unit 302, and is configured to receive a control signal output by the main control unit 302. The charging activation module 40 is connected to the power input terminal 10 and the power output terminal 20, and when the battery 301 is in the over-discharge state, the charging activation module 40 activates the battery 301 according to the input power to charge the battery 301. The charge control module 50 is connected to the charge activation module 40 and the signal input terminal 30, and when the battery 301 is in a non-overdischarge state, the charge control module 50 controls the charge state of the battery 301 according to the control signal.

As one achievable embodiment, the charge state may include charge enable and charge off, charge current, and charge voltage of the charging circuit 200. For example, if the control signal is a PWM signal, the charging current and/or the charging voltage of the charging circuit 200 are controlled; if the control signal is a level signal, the charging circuit 200 is controlled to be charged and turned off.

The charging circuit 200 of this embodiment can be applied to wireless charging or dc-dc charging, and realizes activation of the overdischarge cell 301 and control of the charging state. The charging circuit 200 of this embodiment may be laid out inside the chip, and as an implementation embodiment, the signal input terminal 30 may be connected to the control terminal of the chip through a pin; the charging circuit 200 of this embodiment may also be arranged outside the chip, and the signal input terminal 30 is connected to the control terminal of the chip through a General-purpose input/output (GPIO) or pin. Preferably, the charging circuit 200 of this embodiment is arranged inside the chip, and the effect of reducing the circuit layout pressure and the cost without increasing the circuit space layout can be achieved.

As an implementation example, referring to fig. 3, the charging activation module 40 further includes: the first current limiting unit 41 and the first switching unit 42. Wherein the first current limiting unit 41 is connected with the power input terminal 10; the first switching unit 42 is connected to the power input terminal 10, the first current limiting unit 41, and the power output terminal 20, respectively, and is configured to control connection between the power input terminal 10 and the power output terminal 20 to be turned on and off according to an output voltage of the first current limiting unit 41. When the battery 301 is in an overdischarge state and the output voltage of the first current limiting unit 41 reaches a preset voltage threshold, the connection between the power input terminal 10 and the power output terminal 20 is conducted through the first switch unit 42, so as to activate the battery 301 and charge the battery 301. In an embodiment, the control portion of the first switch unit 42 may be a single integrated control module, or may be the main control unit 302, where the control portion of the first switch unit 42 may include a memory and a processor, and the memory is used to store a preset voltage threshold, and the preset voltage threshold may be adjusted according to an actual application situation and may be set for a user; the processor obtains the output voltage of the first current limiting unit 41, compares the output voltage with a preset voltage threshold, and controls the first switching unit 42 to be closed when the output voltage is equal to or greater than the preset voltage threshold so as to conduct the connection between the power input end 10 and the power output end 20; when the output voltage is less than the preset voltage threshold, the first switching unit 42 is controlled to be turned off to disconnect the power input terminal 10 from the power output terminal 20.

For example, referring to fig. 4, the first current limiting unit 41 is a resistor R1, the first switching unit 42 is a transistor Q1, one end of the resistor R1 is connected to the power input terminal 10, two ends of the resistor R1 are respectively connected to a base and a collector of the transistor Q1, and an emitter of the transistor Q1 is connected to the power output terminal 20. When the battery 301 is in the over-discharge state, if an input power is input from the power input terminal 10, the input power reaches the base electrode of the triode Q1 through the resistor R1, and when the voltage Vbe between the base electrode and the emitter electrode of the triode Q1 reaches the preset voltage threshold, the collector electrode and the emitter electrode of the triode Q1 are conducted, so that the connection between the power input terminal 10 and the power output terminal 20 is conducted, and the input power charges the positive electrode of the battery 301 to realize activation of the battery 301. As an implementation example, the preset voltage threshold is the lowest voltage value at which the transistor Q1 is turned on, and may be a default value, and the preset voltage threshold is exemplified as 0.7V. This embodiment can adjust the magnitude of the base current (activation current) of the transistor Q1 by adjusting the magnitude of the resistance value of the resistor R1 during the activation of the battery 301. The embodiment can realize the activation of the battery 301 and the control of the activation current when the battery 301 is in the over-discharge state, and ensure that the battery 301 is not damaged due to the excessive current in the activation process. The charging circuit 200 of this embodiment may be laid out inside or outside the chip, preferably inside the chip, and the effect of reducing the circuit layout pressure and the cost without increasing the circuit space layout can be achieved.

As an implementation example, referring to fig. 5, the charging control module 50 further includes: a second current limiting unit 51, a third current limiting unit 52, and a second switching unit 53. Wherein a second current limiting unit 51 is connected to the signal input 30; the third current limiting unit 52 is connected to the first current limiting unit 41 and the first switching unit 42; the second switching unit 53 is connected to the signal input terminal 30 through the second current limiting unit 51, and is connected to the first switching unit 42 through the third current limiting unit 52.

For example, referring to fig. 6, the second current limiting unit 51 is a resistor R2, the third current limiting unit 52 is a resistor R3, the second switching unit 53 is a transistor Q2, one end of the resistor R2 is connected to the signal input terminal 30, the other end of the resistor R2 is connected to the base of the transistor Q2, the emitter of the transistor Q2 is grounded, the collector of the transistor Q2 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to one end of the resistor R1 and the base of the transistor Q1.

As an implementation example, if the control signal input by the signal input terminal 30 is a level signal and the level signal is a high level signal, the transistor Q2 is turned on, the voltage of the base of the transistor Q1 is pulled down by the resistor R3, the transistor Q1 is turned off, so that the connection between the power input terminal 10 and the power output terminal 20 is disconnected, no current is led to the battery, and the charging circuit 200 stops charging. If the control signal input by the signal input terminal 30 is a level signal and the level signal is a low level signal, the transistor Q2 is turned off and the transistor Q1 is turned on, so that the connection between the power input terminal 10 and the power output terminal 20 is turned on, and the input power is charged to the positive electrode of the battery 301, thereby enabling the charging circuit 200. In this embodiment, the resistor R2 can perform a current limiting function to prevent the base voltage of the transistor Q2 from being pulled down below a preset voltage threshold, which is the lowest voltage value at which the transistor Q2 is turned on, and may be a default value, for example, the preset voltage threshold is 0.7V.

As an implementation embodiment, when the battery 301 is in a non-overdischarge state, the battery 301 may perform normal operation, and the transistor Q1 and the transistor Q2 operate in a saturation region, and if the control signal input by the signal input terminal 30 is a PWM signal, the switching frequency of the transistor Q2 is adjusted by the duty ratio change of the PWM signal, so as to adjust the switching frequency of the transistor Q1, thereby realizing control of the charging current and the charging voltage.

This embodiment can realize control of the charging current and the charging voltage, and can avoid the charging current from being too small, resulting in too long charging time, and also avoid the charging current from being too large, resulting in damage to the battery 301. The charging circuit 200 of this embodiment may be laid out inside or outside the chip, preferably inside the chip, and the effect of reducing the circuit layout pressure and the cost without increasing the circuit space layout can be achieved.

As an implementation example, referring to fig. 7, the charging circuit 200 further includes: the voltage dividing module 60, one end of the voltage dividing module 60 is connected to the first switch unit 42 and the power output terminal 20, and the other end of the voltage dividing module 60 is connected to the second switch unit 53 and the second current limiting unit 51. This embodiment enables control of the activation current, ensuring that the battery 301 is not damaged by excessive current during activation.

Further, referring to fig. 8, the voltage dividing module 60 further includes: a first voltage division unit 61 and a second voltage division unit 62, wherein one end of the first voltage division unit 61 is connected with the first switch unit 42 and the power output end 20, and the other end of the first voltage division unit 61 is connected with the second switch unit 53 and the second current limiting unit 51; the second voltage dividing unit 62 is connected to the first voltage dividing unit 61, the second switching unit 53, and the second current limiting unit 51. This embodiment enables control of the activation current, ensuring that the battery 301 is not damaged by excessive current during activation.

For example, referring to fig. 9, the first voltage dividing unit 61 is a resistor R4, the second voltage dividing unit 62 is a resistor R5, one end of the resistor R4 is connected to the emitter of the transistor Q1 and the power output terminal 20, the other end of the resistor R4 is commonly connected to the base of the transistor Q2, the resistor R2 and one end of the resistor R5, and the other end of the resistor R5 is grounded.

As an implementation embodiment, when the battery 301 is in the over-discharge state, the positive voltage of the battery 301 is 0V, if the power input terminal 10 has an input power, the input power reaches the base electrode of the triode Q1 through the resistor R1, when the voltage Vbe between the base electrode and the emitter electrode of the triode Q1 reaches the preset voltage threshold, the collector electrode and the emitter electrode of the triode Q1 are turned on, the voltage is divided by the resistor R4 and the resistor R5, so that the triode Q2 works in the amplifying region, the current amplification factor of the triode Q2 is the ratio between the collector current Ic and the base current Ib, the resistance ratio of the resistor R4 and the resistor R5 is adjusted, the base current Ib of the triode Q2 is controlled to be a preset value, and the preset value can be determined by a user, so that the collector current Ic of the corresponding triode Q2 is controlled, and then the base voltage Vbe of the triode Q1 is controlled, so that the over-discharge cell 301 is activated, and the battery 301 cannot be damaged due to the over-large activation current in the activation process is not achieved. The charging circuit 200 of this embodiment may be laid out inside or outside the chip, preferably inside the chip, and the effect of reducing the circuit layout pressure and the cost without increasing the circuit space layout can be achieved.

As an example, the base current Ib, collector current Ic, and voltage Vce between the collector and emitter of transistor Q1 and transistor Q2 are plotted in fig. 10. The relationship is determined by the properties of the device itself.

As an implementation example, referring to fig. 11, the charging circuit 200 further includes: the detection module 70 and the signal output 80. The detection module 70 is connected to the power input terminal 10 and the charging activation module 40, and the detection module 70 is used for detecting a power signal of the power input terminal 10; the signal output end 80 is connected to the detection module 70 and the main control unit 302, and the signal output end 80 is used for transmitting the power signal to the main control unit 302, so that the main control unit 302 outputs the control signal according to the power signal. This embodiment can control the charge enable and charge disable of the charging circuit 200.

Further, referring to fig. 12, the detection module 70 further includes: the third voltage dividing unit 71 and the fourth voltage dividing unit 72. One end of the third voltage dividing unit 71 is connected to the power input terminal 10 and the charging activation module 40, and the other end of the third voltage dividing unit 71 is connected to the signal output terminal 80; one end of the fourth voltage dividing unit 72 is connected to the third voltage dividing unit 71 and the signal output terminal 80, and the other end of the fourth voltage dividing unit 72 is grounded. This embodiment can control the charge enable and charge disable of the charging circuit 200.

For example, referring to fig. 13, the third voltage dividing unit 71 is a resistor R6, the fourth voltage dividing unit 72 is a resistor R7, one end of the resistor R6 is connected to the power input terminal 10 and the resistor R1, the other end of the resistor R6 is commonly connected to the signal output terminal 80 and one end of the resistor R7, and the other end of the resistor R7 is grounded.

As an implementation embodiment, when the power input terminal 10 has an input power input, the voltage is divided by the resistor R6 and the resistor R7 and the voltage signal is transmitted to the signal output terminal 80, the main control unit 302 receives the voltage signal and detects the corresponding voltage to determine whether the voltage is within the preset charging voltage threshold range, if yes, a high level signal is output to the signal input terminal 30, so that the triode Q2 is turned on, the triode Q1 is turned off, and the charging of the charging circuit 200 is turned off; if not, a low level signal is output to the signal input terminal 30 to turn off the transistor Q2 and turn on the transistor Q1, thereby realizing the charging enable of the charging circuit 200. The charging circuit 200 of this embodiment may be laid out inside or outside the chip, preferably inside the chip, and the effect of reducing the circuit layout pressure and the cost without increasing the circuit space layout can be achieved.

As an achievable embodiment, referring to fig. 14, the charging circuit 200 further includes a first filtering module 90, and the first filtering module 90 is connected to the power output terminal 20 and the output of the charging activation module 40. The first filtering module 90 can filter out noise generated by the charging circuit 200 due to the switching unit of the charging control module 50.

For example, referring to fig. 15, the first filtering module 90 is a capacitor C1, one end of the capacitor C1 is connected to the emitter of the triode Q1 and the power output terminal 20, and the other end of the capacitor C1 is grounded. The capacitor C1 can filter out noise generated by the charging circuit 200 due to the transistor Q1 and the transistor Q2. The first filtering module 90 of this embodiment may be disposed outside the chip, and the layout outside the chip may reduce the circuit layout pressure inside the chip due to the larger size of the first filtering module 90.

As an implementation example, referring to fig. 16, the charging circuit 200 further includes a filtering rectification module 100, and the filtering rectification module 100 is connected to the power input terminal 10. This embodiment is capable of filtering out input power noise and adjusting the input power to the proper input.

For example, referring to fig. 17, the filtering and rectifying module 100 further includes a line charging coil L1, a freewheeling diode D1, a capacitor C2, and a rectifying diode D2, where the line charging coil L1, the freewheeling diode D1, and the capacitor C2 are connected in parallel, one end of the rectifying diode D2 is connected to an output end of the parallel, and the other end of the rectifying diode D2 is connected to the power input end 10, and the filtering and rectifying module 100 may provide an input power to the power input end 10. The filter rectifying module 100 of the embodiment may be disposed outside the chip, and the circuit layout pressure inside the chip may be reduced due to the larger size of the filter rectifying module 100.

As an implementation example, referring to fig. 18, the charging circuit 200 further includes a second filtering module 110, and the second filtering module 110 is connected to the power input terminal 10 and the output of the filtering rectification module 100. The second filtering module 110 can store the power from the filtering rectification module 100 and provide the power to the post-stage charging circuit, or filter the power noise directly supplied by the direct current adapter.

For example, referring to fig. 19, the second filter module 110 is a capacitor C3, one end of the capacitor C3 is connected to the power input terminal 10 and the rectifying diode D2, and the other end of the capacitor C3 is grounded.

The second filter module 110 of this embodiment may be disposed outside the chip, and the layout outside the chip may reduce the circuit layout pressure inside the chip due to the larger volume of the second filter module 110.

As shown in fig. 20, a charging method according to an embodiment of the present application is applied to the above charging circuit, and includes the following steps:

step S10: when the battery is in an overdischarge state, the charging activation module is controlled to activate the battery according to the input power supply so as to charge the battery.

In this step, the related circuit structure of the charging activation module is described in detail in the foregoing, and will not be described in detail herein. As an embodiment, when the battery is in the over-discharge state, if the first switch unit is closed, the connection between the power input terminal and the power output terminal is turned on to activate the battery, so that the input power charges the battery.

As an embodiment, in the process of activating the battery, acquiring the current amplification factor of the second switch unit, acquiring the resistance value adjusting proportion of the first voltage dividing unit and the second voltage dividing unit, and controlling the output current of the second switch unit according to the resistance value adjusting proportion and the current amplification factor; the current level of the active battery is controlled according to the output current level.

Step S20: when the battery is in a non-overdischarge state, the working state of the charging control module is controlled according to the control signal so as to control the charging state of the battery.

In this step, the related circuit structure of the charging control module is described in detail in the foregoing, and will not be described in detail herein. The control signals include PWM signals for implementing control of the charging current and/or the charging voltage, and level signals for implementing control of the charge enable and charge off of the battery.

As an embodiment, if the control signal is a PWM signal, the operating state of the charging control module is controlled according to the PWM signal to control the charging current and/or the charging voltage of the battery. Illustratively, a duty cycle corresponding to the PWM signal is obtained, and a switching frequency of the second switching unit is adjusted according to the duty cycle; the switching frequency of the first switch is adjusted according to the switching frequency of the second switch unit so as to realize the control of the charging current and/or the charging voltage.

As an embodiment, if the control signal is a level signal, the working state of the charging control module is controlled according to the level signal to control the charging enable and the charging shutdown of the battery. For example, if the level signal is a high level signal, the second switch unit is turned on, the first switch unit is turned off, and the connection between the power input end and the power output end is disconnected, so that the charging of the battery is turned off. If the level signal is a low level signal, the second switch unit is turned off, the first switch unit is turned on, and the connection between the power input end and the power output end is turned on, so that the charging enabling of the battery is realized.

The embodiment of the application also provides a chip which comprises the charging circuit and/or the charging method. The Chip (Integrated Circuit, IC) is also referred to as a Chip, which may be, but is not limited to, a SOC (System on Chip) Chip, SIP (System in package ) Chip. When the battery is in an overdischarge state, the charging activation module activates the battery according to an input power supply to charge the battery; when the battery is in a non-overdischarge state, the charging control module controls the charging state of the battery according to the control signal, so that the activation of the overdischarge battery can be realized, the circuit layout pressure is low, and the technical problems that the battery cannot be normally used due to overdischarge and the charging current is uncontrollable can be solved.

The embodiment of the application also provides electronic equipment, which comprises an equipment main body and the chip arranged in the equipment theme. The electronic device is a portable electronic device, and may be, but is not limited to, a body weight scale, a body fat scale, a nutritional scale, an infrared electronic thermometer, a pulse oximeter, a body composition analyzer, a mobile power supply, a wireless charger, a fast charger, an on-board charger, an adapter, a display, a USB (Universal Serial Bus ) docking station, a stylus, a real wireless headset, an automobile center control screen, an automobile, an intelligent wearable device, a mobile terminal, and an intelligent home device. The intelligent wearing equipment comprises, but is not limited to, an intelligent watch, an intelligent bracelet and a cervical vertebra massage instrument. Mobile terminals include, but are not limited to, smartphones, notebook computers, tablet computers, POS (point of sales terminal, point of sale terminal) machines. The intelligent household equipment comprises, but is not limited to, an intelligent socket, an intelligent electric cooker, an intelligent sweeper and an intelligent lamp. When the battery is in an overdischarge state, the charging activation module activates the battery according to an input power supply to charge the battery; when the battery is in a non-overdischarge state, the charging control module controls the charging state of the battery according to the control signal, so that the activation of the overdischarge battery can be realized, the circuit layout pressure is low, and the technical problems that the battery cannot be normally used due to overdischarge and the charging current is uncontrollable can be solved.

Although the present application has been described in terms of the preferred embodiments, it should be understood that the present application is not limited to the specific embodiments, but is capable of numerous modifications and equivalents, and alternative embodiments and modifications of the embodiments described above, without departing from the spirit and scope of the present application.

Claims

1. A charging circuit, comprising:

the power supply input end is used for receiving an input power supply;

the signal input end is used for being connected with the main control unit so as to receive the control signal output by the main control unit;

2. The charging circuit of claim 1, wherein the charging activation module further comprises:

the first current limiting unit is connected with the power input end and used for adjusting and activating the current of the battery;

the first switch unit is respectively connected with the power input end, the first current limiting unit and the power output end; when the first switch unit is closed, the connection between the power input end and the power output end is conducted so that the input power source charges the battery; and when the first switch unit is turned off, the connection between the power input end and the power output end is disconnected.

3. The charging circuit of claim 2, comprising: the charge control module further includes:

the second current limiting unit is connected with the signal input end;

4. The charging circuit of claim 3, further comprising: and one end of the voltage division module is connected with the first switch unit and the power output end, and the other end of the voltage division module is connected with the second switch unit and the second current limiting unit.

5. The charging circuit of claim 4, wherein the voltage divider module further comprises:

6. The charging circuit of claim 1, further comprising:

7. The charging circuit of claim 6, wherein the detection module further comprises:

8. The charging circuit of claim 1, further comprising a first filter module coupled to the power supply output and an output of the charging activation module.

9. The charging circuit of claim 1, further comprising a filter rectifier module, the filter rectifier module being connected to the power input.

10. A charging method for a charging circuit according to any one of claims 1 to 9, the charging method comprising:

when the battery is in an overdischarge state, controlling a charging activation module to activate the battery according to an input power supply so as to charge the battery;

and when the battery is in a non-overdischarge state, controlling the working state of the charging control module according to the control signal so as to control the charging state of the battery.

11. The charging method of claim 10, wherein controlling the charge activation module to activate the battery based on the input power source to charge the battery when the battery is in the over-discharge state further comprises:

When the battery is in an overdischarge state, if the first switch unit is closed, the connection between the power input end and the power output end is conducted to activate the battery, so that the input power charges the battery.

12. The charging method of claim 11, wherein controlling the operating state of the charge control module according to the control signal to control the state of charge of the battery when the battery is in the non-overdischarged state comprises:

and if the control signal is a level signal, controlling the working state of the charging control module according to the level signal so as to control the charging enabling and the charging closing of the battery.

13. The charging method of claim 12, wherein controlling the operating state of the charge control module according to the PWM signal to control the charging current and/or the charging voltage of the battery comprises:

the switching frequency of the second switching unit is adjusted according to the duty ratio corresponding to the PWM signal;

And adjusting the switching frequency of the first switching unit according to the switching frequency of the second switching unit so as to adjust the charging current and/or the charging voltage.

14. The charging method of claim 12, wherein controlling the operating state of the charge control module according to the level signal to control charge enable and charge shut down of the battery comprises:

15. The charging method of claim 13, wherein the charging method further comprises:

Controlling the output current of the second switch unit according to the resistance value regulation proportion and the current amplification factor;

and controlling the current magnitude of activating the battery according to the output current magnitude.

16. Chip, characterized by comprising a charging circuit according to any of the preceding claims 1-7 and/or a charging method according to any of the preceding claims 10-15.

17. An electronic device comprising a device body and a chip as claimed in claim 16 provided on the device body.