KR-102963946-B1 - Charger integrated circuit for charging battery device and electronic device including the same

KR102963946B1KR 102963946 B1KR102963946 B1KR 102963946B1KR-102963946-B1

Abstract

A charging integrated circuit, a battery switch, a battery device, and an electronic device for charging a battery device are disclosed. A charging integrated circuit according to the technical concept of the present disclosure is a charging integrated circuit for charging a battery device comprising a first battery and a second battery, comprising: a first charger configured to generate a first charging current from an input voltage received from an input voltage terminal; and a battery switch configured to provide the first charging current to the battery device, comprising a plurality of transistors for connecting the first and second batteries in series or in parallel based on the input voltage, a first terminal voltage of the first battery, and a second terminal voltage of the second battery.

Inventors

이성우
권민규
오형석
조용환

Assignees

삼성전자주식회사

Dates

Publication Date: 20260511
Application Date: 20200309

Claims (20)

A charging integrated circuit for charging a battery device including a first battery and a second battery, A first charger configured to generate a first charging current from an input voltage received from an input voltage terminal; and A battery switch configured to provide the first charging current to the battery device, comprising a plurality of transistors for connecting the first and second batteries in series or in parallel based on the input voltage, the first terminal voltage of the first battery, and the second terminal voltage of the second battery, and The above plurality of transistors are, A first transistor connected between a first node connectable to the negative terminal of the first battery and a ground terminal; A second transistor connected between the first node and a second node connectable to the positive terminal of the second battery; A third transistor connected to a third node connectable to the positive terminal of the first battery; and It includes a fourth transistor connected between the second node and the third transistor, When the above input voltage has a fixed voltage level, the first, third, and fourth transistors are turned on so that the first and second batteries are connected in parallel, and When the above input voltage has a variable voltage level, the second transistor is turned on so that the first and second batteries are connected in series, and A charging integrated circuit characterized in that the resistance value of at least one of the first and third transistors is adjusted so that the first battery current applied to the first battery does not exceed a first reference value, or the resistance value of the fourth transistor is adjusted so that the second battery current applied to the second battery does not exceed a second reference value.
In paragraph 1, A charging integrated circuit characterized in that at least one of the plurality of transistors has a current control function to control at least one of the first battery current and the second battery current.
In paragraph 1, The battery switch performs a balancing operation to charge an undercharged battery using the energy of the overcharged battery among the first and second batteries, and A charging integrated circuit characterized in that when the first, third, and fourth transistors are turned on, the energy of the first battery is transferred to the second battery, and the first terminal voltage and the second terminal voltage become equal as a balanced voltage.
In claim 1, the plurality of transistors are, A charging integrated circuit characterized by further including a fifth transistor connected between a fourth node between the third and fourth transistors and an output node connectable to a load.
In paragraph 1, At least one of the first and third transistors has a current control function to control the first battery current, or A charging integrated circuit characterized in that the fourth transistor has a current control function to control the second battery current.
In paragraph 1, A charging integrated circuit characterized in that, in a discharge mode where the input voltage terminal is not connected to the charging integrated circuit, the first, third, and fourth transistors are turned on and the second transistor is turned off.
In paragraph 1, A charging integrated circuit characterized in that when the first terminal voltage and the second terminal voltage are substantially similar, the second transistor is turned on and the first and third transistors are turned off, and accordingly, the battery switch connects the first and second batteries in series.
In Paragraph 7, In charging mode, the fourth transistor is turned off, and A charging integrated circuit characterized in that, in discharge mode, the fourth transistor is turned on.
In paragraph 3, A charging integrated circuit characterized in that when the difference between the first terminal voltage and the second terminal voltage is greater than or equal to a reference value, the first, third, and fourth transistors are turned on and the second transistor is turned off, and accordingly, the battery switch connects the first and second batteries in parallel.
In Paragraph 9, If the first terminal voltage is greater than the second terminal voltage, The resistance value of the fourth transistor is adjusted so that the second battery current applied to the second battery does not exceed the second reference value, or A charging integrated circuit characterized by the first charger limiting the first charging current such that the first battery current applied to the first battery is smaller than the second battery current.
In Paragraph 9, If the second terminal voltage is greater than the first terminal voltage, The resistance value of the first transistor is adjusted so that the first battery current applied to the first battery does not exceed a first reference value, or A charging integrated circuit characterized by the first charger limiting the first charging current such that the first battery current is greater than the second battery current applied to the second battery.
In paragraph 1, A charging integrated circuit characterized in that when the first charger does not receive the input voltage, the first, third, and fourth transistors are turned on and the second transistor is turned off, and accordingly, the battery switch connects the first and second batteries in parallel.
In Paragraph 12, If the second terminal voltage is greater than the first terminal voltage, the resistance value of the first transistor is adjusted so that the first battery current applied to the first battery does not exceed the first reference value, and A charging integrated circuit characterized in that if the first terminal voltage is greater than the second terminal voltage, the resistance value of the fourth transistor is adjusted so that the second battery current applied to the second battery does not exceed a second reference value.
In paragraph 1, It further includes a second charger configured to generate a second charging current from the input voltage received from the input voltage terminal, and When the input voltage has the fixed voltage level, the first charger is deactivated and the second charger is activated, and the battery switch connects the first and second batteries in parallel and provides the second charging current to the battery device. A charging integrated circuit characterized in that when the input voltage has the variable voltage level, the first charger is activated and the battery switch provides the first charging current to the battery device.
In Paragraph 14, A charging integrated circuit characterized in that the second charger is a switching charger.
In paragraph 15, the switching charger above is, First, second, and third switches connected in series between the input voltage terminal and the ground terminal; An inductor connected between a switching node between the second switch and the third switch and an output node connectable to a system load; and A charging integrated circuit characterized by including a fourth switch connected between the output node and the battery switch.
In paragraph 1, the first charger is a direct charger, and The above direct charger is a charging integrated circuit characterized by including at least one switch connected between a node connectable to a positive terminal of the first battery and an input voltage terminal.
In paragraph 1, A charging integrated circuit characterized by further including a controller configured to control the resistance value of at least one transistor so that the current flowing through at least one of the plurality of transistors does not exceed a reference value.
A charging integrated circuit for charging a battery device including a first battery and a second battery, A direct charger configured to generate a first charging current from an input voltage received from an input voltage terminal; A switching charger configured to generate a second charging current from the above input voltage; and A battery switch configured to provide the first and second batteries in series or parallel based on the input voltage, the first terminal voltage of the first battery and the second terminal voltage of the second battery, and the first charging current or the second charging current to the battery device. The above plurality of transistors are, A first transistor connected between a first node connectable to the negative terminal of the first battery and a ground terminal; A second transistor connected between the first node and a second node connectable to the positive terminal of the second battery; A third transistor connected to a third node connectable to the positive terminal of the first battery; and It includes a fourth transistor connected between the second node and the third transistor, When the above input voltage has a fixed voltage level, the first, third, and fourth transistors are turned on so that the first and second batteries are connected in parallel, and When the above input voltage has a variable voltage level, the second transistor is turned on so that the first and second batteries are connected in series, and At least one of the first and third transistors has a current control function to control a first battery current applied to the first battery, or the fourth transistor has a current control function to control a second battery current applied to the second battery, and A charging integrated circuit characterized in that the resistance value of at least one of the first and third transistors is adjusted so that the first battery current does not exceed a first reference value, and the resistance value of the fourth transistor is adjusted so that the second battery current does not exceed a second reference value.
A battery switch connectable to a battery device including a first battery and a second battery, A first transistor connected between a first node connectable to the negative terminal of the first battery and a ground terminal; A second transistor connected between the first node and a second node connectable to the positive terminal of the second battery; A third transistor connected to a third node connectable to the positive terminal of the first battery; and It includes a fourth transistor connected between the second node and the third transistor, and When the second transistor is turned on, the battery switch connects the first and second batteries in series, and When the first, third, and fourth transistors are turned on, the battery switch connects the first and second batteries in parallel, and At least one of the first to fourth transistors has a current control function to control at least one of a first battery current applied to the first battery and a second battery current applied to the second battery, and At least one of the first and third transistors has a current control function to control a first battery current applied to the first battery, or the fourth transistor has a current control function to control a second battery current applied to the second battery, and The resistance value of at least one of the first and third transistors is adjusted so that the first battery current does not exceed a first reference value, or the resistance value of the fourth transistor is adjusted so that the second battery current does not exceed a second reference value, and The battery switch performs a balancing operation to charge an undercharged battery using the energy of the overcharged battery among the first and second batteries, and A battery switch characterized in that when the first, third, and fourth transistors are turned on, the energy of the first battery is transferred to the second battery, and the voltage across the first battery and the voltage across the second battery become equal to the balance voltage.

Description

Charger integrated circuit for charging battery device and electronic device including the same The technical concept of the present disclosure relates to a charging integrated circuit, and more specifically, to a charging integrated circuit for charging a battery device comprising a plurality of batteries, a battery switch, and an electronic device comprising the charging integrated circuit. Portable electronic devices such as mobile phones include batteries. With the advent of the 5G era, the power required by mobile phones is increasing. Since the usage time of 5G mobile phones is inevitably reduced with the battery capacity currently in use, an increase in battery capacity is required, and accordingly, the importance of efficient charging for battery devices containing multiple batteries is also growing. FIGS. 1 to 4 each show an electronic device according to some embodiments of the present disclosure. FIGS. 5 and FIGS. 6 are block diagrams illustrating electronic devices according to some embodiments of the present disclosure, respectively. FIG. 7 is a circuit diagram showing an electronic device according to one embodiment of the present disclosure. FIG. 8 exemplarily illustrates a balancing operation for the first and second batteries according to one embodiment of the present disclosure. FIG. 9 is a graph showing the voltage of the first and second batteries over time according to one embodiment of the present disclosure. FIG. 10 is a circuit diagram exemplifying the first transistor illustrated in FIG. 5. FIG. 11 is a block diagram showing an electronic device according to one embodiment of the present disclosure. FIG. 12 shows a first charging mode of a charging integrated circuit according to one embodiment of the present disclosure. FIG. 13 shows a second charging mode of a charging integrated circuit according to one embodiment of the present disclosure. FIGS. 14 and 15 show variations of a second charging mode of a charging integrated circuit according to some embodiments of the present disclosure. FIGS. 16 and 17 illustrate a third charging mode of a charging integrated circuit according to some embodiments of the present disclosure. FIG. 18 shows a first discharge mode of a charging integrated circuit according to one embodiment of the present disclosure. FIGS. 19 and 20 illustrate a second discharge mode of a charging integrated circuit according to some embodiments of the present disclosure. FIGS. 21 to 24 are block diagrams each showing electronic devices according to some embodiments of the present disclosure. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. FIG. 1 shows an electronic device (10) according to one embodiment of the present disclosure. Referring to FIG. 1, the electronic device (10) may include a charging integrated circuit (IC) (100), and the charging integrated circuit (100) may be referred to as a "battery charger." For example, the charging integrated circuit (100) may be implemented as an integrated circuit chip and may be mounted on a printed circuit board. For example, the electronic device (10) may be a mobile device such as a smartphone, a tablet PC (Personal Computer), a mobile phone, a PDA (Personal Digital Assistant), a laptop, a wearable device, a GPS (Global Positional System) device, an e-book reader, a digital broadcasting terminal, an MP3 player, a digital camera, etc. For example, the electronic device (10) may be an electric vehicle. Additionally, the electronic device (10) may include a battery device (200). In one embodiment, the battery device (200) may be embedded in the electronic device (10). In one embodiment, the battery device (200) may be detachable from the electronic device (10). The battery device (200) may include a first battery (BAT1) and a second battery (BAT2), and the first and second batteries (BAT1, BAT2) may be connected in series or in parallel. In some embodiments, the battery device (200) may include three or more batteries. Thus, the electronic device (10) can perform high-performance operation by utilizing the battery device (200) which includes multiple batteries. In one embodiment, the first battery (BAT1) may be a first battery cell and the second battery (BAT2) may be a second battery cell, and the battery device (200) may be a multi-cell battery comprising a plurality of battery cells. For example, the battery device (200) may be implemented as a battery pack. In one embodiment, the first battery (BAT1) may be a first battery pack and the second battery (BAT2) may be a second battery pack, and the battery device (200) may be implemented as a battery device comprising a plurality of battery packs. In one embodiment, at least one of the first and second battery packs may be a multi-cell battery comprising a plurality of battery cells. In one embodiment, at least one of the first and second battery packs may be a single-cell battery comprising a single bat