Battery charging apparatus and method of operating the same, and mobile device

Abstract

The battery charging device includes a switching transistor with a triple-well structure having a body terminal electrically connected to a first well region. Gate drive circuitry provides a gate controller for regulating the gate voltage applied to the gate of the switching transistor and a gate turn-off switch for selectively connecting the gate to a ground node. A body selector generates a first detection signal using a first voltage and a second voltage, and regulates the voltage supplied to the body terminal. The body selector connects the body terminal to the node supplying the second voltage in response to the first detection signal and a delayed second detection signal, and connects the body terminal to the ground node in response to a third detection signal obtained by inverting the first detection signal.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2025-0048064, filed on April 14, 2024, with the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] This disclosure relates to a battery charging device, a method of operating the battery charging device, and a mobile device including the battery charging device. Background Technology

[0004] As electronic devices become smaller and more powerful, the demand for stable and efficient battery charging equipment has increased. Typically, battery charging equipment controls the charging current or voltage based on the battery's state. Recently, charging control methods using switching transistors have been adopted to reduce power loss and improve circuit response speed. Switching transistors turn on and off according to control signals and can provide power transmission paths to the battery and system. However, a technical means is needed to effectively control problems such as voltage variations, leakage current, or parasitic paths that can occur depending on the operation of the switching transistors. Summary of the Invention

[0005] One aspect of this disclosure is to provide a battery charging device that prevents damage to the switching transistor and has improved performance by preventing the gate-body voltage from exceeding the maximum voltage that the switching transistor can withstand due to the increase in gate voltage.

[0006] A battery charging device according to an example embodiment of the present disclosure includes: a switching transistor including a first well region doped with a first impurity, a second well region disposed within the first well region and doped with a second impurity different from the first impurity, a source region and a drain region disposed within the second well region and doped with the first impurity, a body terminal disposed within the second well region and doped with the second impurity and electrically connected to the first well region, and a gate disposed between the source region and the drain region; a gate driving circuit including a gate controller and a gate turn-off switch, the gate controller receiving a first voltage and regulating a gate voltage input to the gate, the gate turn-off switch being connected between a ground node providing a ground voltage and the gate; and a body selector that uses the first voltage and a second voltage different from the first voltage to generate a first detection signal and regulates the voltage supplied to the body terminal, and the body selector connects the body terminal to the node supplying the second voltage in response to the first detection signal and a second detection signal that delays the first detection signal for a predetermined time period, and connects the body terminal to the ground node in response to a third detection signal obtained by inverting the first detection signal.

[0007] According to an example embodiment of the present disclosure, a method of operating a battery charging device includes a switching transistor having a triple-well structure, wherein a first well region and a second well region disposed within the first well region and providing a body region terminal are electrically connected to each other. The method of operating includes: with the body region terminal connected to a ground node, starting to supply a first voltage to the gate of the switching transistor; comparing the first voltage with a second voltage different from the first voltage; when a value obtained by multiplying the first voltage by a first coefficient is greater than a value obtained by multiplying the second voltage by a second coefficient different from the first coefficient, disconnecting the body region terminal from the ground node and supplying the second voltage to the body region terminal through a resistor element; and when the body region voltage reaches the second voltage and a predetermined time has elapsed, short-circuiting the node supplying the second voltage from the body region terminal.

[0008] A mobile device according to an example embodiment of the present disclosure includes: a system including a processor, a memory, and a storage; a battery that provides power for driving the system and is charged by a system voltage generated by an external power source; and a battery charging device including a switching transistor that controls the supply of the system voltage to the battery and a body region selector that controls the voltage supplied to the body region terminal of the switching transistor, wherein the switching transistor has a triple-well structure in which a first well region and a second well region disposed within the first well region and providing a body region terminal are electrically connected to each other; at a first time point, a first voltage is supplied to the gate of the switching transistor, and the battery charging device supplies power from the battery to the system; at a second time point after the first time point, the body region selector disconnects the body region terminal from a ground node and supplies a second voltage from the battery to the body region terminal through a resistive element; and at a third time point after the second time point, when the body region voltage reaches the second voltage and a predetermined time has elapsed, the body region selector short-circuits the node supplying the second voltage from the body region terminal.

[0009] According to an example embodiment of this disclosure, a battery charging device may include a switching transistor with a triple-well structure, in which a first well region and a second well region disposed within the first well region are electrically connected to each other, thereby blocking parasitic paths formed in the switching transistor. A body region selector included in the battery charging device senses the relative ratio of a first voltage and a second voltage to control the voltage supplied to the body region terminals, thereby preventing the gate-body region voltage from exceeding the maximum voltage that the switching transistor can withstand due to an increase in the gate voltage, and preventing damage to the switching transistor. By blocking parasitic paths formed in the switching transistor and preventing damage to the switching transistor, the performance of the battery charging device can be improved.

[0010] The advantages and effects of this application are not limited to the foregoing, and can be more easily understood in the process of describing specific exemplary embodiments of this disclosure. Attached Figure Description

[0011] The above and other aspects, features and advantages of this disclosure will become clearer from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0012] Figure 1 This is a schematic diagram illustrating a mobile device according to an example embodiment of the present disclosure;

[0013] Figure 2 This is a block diagram illustrating a battery charging device according to an example embodiment of the present disclosure;

[0014] Figure 3 This is a schematic diagram illustrating a switching transistor according to an exemplary embodiment of the present disclosure;

[0015] Figure 4 This is a schematic diagram illustrating a battery charging device according to an exemplary embodiment of the present disclosure;

[0016] Figures 5 to 8 This is a schematic diagram illustrating a body region selector according to an exemplary embodiment of the present disclosure;

[0017] Figure 9 and Figure 10 This is a view illustrating the operation of a battery charging device according to an exemplary embodiment of this disclosure;

[0018] Figures 11 to 15 This is a view illustrating the operation of a battery charging device according to an exemplary embodiment of this disclosure; and

[0019] Figure 16 This is a flowchart illustrating a method of operating a battery charging device according to an example embodiment of the present disclosure. Detailed Implementation

[0020] In the following description, exemplary embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0021] Figure 1 This is a simplified view illustrating a mobile device according to an example embodiment of the present disclosure.

[0022] Mobile device 1 according to an example embodiment of the present disclosure may include system 20, battery charging device 30 and battery 40.

[0023] The charger output voltage 10 can power system 20 and charge battery 40. For details, please refer to... Figure 1 The charger output voltage 10 can supply power to the system 20 through the system voltage node 21, and can supply power to the battery 40 through the system voltage node 21 and the battery voltage node 41.

[0024] The charger output voltage 10 can be the voltage that receives power from an external power source (e.g., a charger) and outputs after passing through a regulator, protection circuitry, etc. The regulator can be a circuit that adjusts the input voltage to a stable output voltage, and the protection circuitry can be a circuit that protects the circuitry and battery 40 from conditions such as overvoltage, overcurrent, and abnormal temperature. For example, the regulator and protection circuitry can be included in the external power source or can be included in the mobile device 1.

[0025] The charger output voltage 10 can vary depending on the type of charger. For example, a linear charger can linearly reduce the external input voltage and provide a relatively constant and stable charger output voltage 10. A current charger can provide a flexible charger output voltage 10 depending on the charging conditions and control signals.

[0026] System 20 can operate using the charger output voltage 10 and power supplied from battery 40. System 20 may include a processor, volatile and / or non-volatile memory, and storage for storing data. The processor can perform various computational processes by executing instructions stored in memory, and the storage can store the operating system, applications, and data files to support the operation of system 20. When the power supply to system 20 is interrupted, the operation of system 20 can be limited or stopped.

[0027] The battery charging device 30 may include a gate drive circuit 31, a switching transistor 32, and a body selector 33. The switching transistor 32 may have a triple-well structure, wherein a first well region and a second well region disposed within the first well region and providing a body terminal are electrically connected to each other. The gate drive circuit 31 may receive a gate control signal and may adjust the voltage supplied to the gate of the switching transistor 32 in response to the gate control signal. The body selector 33 may adjust the voltage supplied to the body terminal of the switching transistor 32.

[0028] In an example embodiment, the battery charging device 30 may include a system voltage node 21 providing the system voltage VSYS and a battery voltage node 41 providing the battery voltage VBAT. System voltage node 21 can provide a path for supplying the charger output voltage 10 to the system 20 and can provide a path for supplying power from battery voltage node 41 to the system 20. System voltage node 21 can provide a path for supplying the charger output voltage 10 to the battery 40. Battery voltage node 41 can provide a path for supplying the charger output voltage 10 to the battery 40 and can provide a path for supplying power from the battery 40 to the system 20.

[0029] Even when the external power supply is cut off, battery 40 can store electricity and provide power to drive system 20. The output voltage of battery 40 can be transmitted through battery voltage node 41, and battery voltage node 41 can be electrically connected to battery 40, battery charging device 30, and system voltage node 21. In addition, battery 40 can be charged by charger output voltage 10 from an external power source.

[0030] In the exemplary embodiments of this disclosure, the first well region and body region terminals of the switching transistor 32 can be electrically connected to provide a smooth power transmission path for the battery charging device 30. Furthermore, to prevent the gate-body region voltage of the switching transistor 32 from increasing or excessive peak battery current flow that could damage the switching transistor 32, the body region selector 33 can control the voltage supplied to the body region terminals. Therefore, the battery charging device 30 can operate stably, and the performance of the mobile device 1 can be improved.

[0031] Figure 2 This is a simple block diagram illustrating a battery charging device according to an example embodiment of the present disclosure.

[0032] A battery charging device 100 according to an exemplary embodiment of the present disclosure may include a gate drive circuit 110, a switching transistor 120, and a body region selector 130. The drain region of the switching transistor may be connected to a system voltage node 101 supplying the system voltage VSYS, and the source region may be connected to a battery voltage node 102 supplying the battery voltage VBAT.

[0033] The gate drive circuit 110 may include a charge pump 111, a gate controller 112, and a gate turn-off switch 113. The charge pump 111 may input voltage to the gate controller 112, and the gate controller 112 may supply voltage to the gate of the switching transistor 120.

[0034] The charge pump 111 can be a voltage conversion circuit that uses an internal capacitor to generate a voltage higher or lower than the input voltage. The charge pump 111 can receive the battery voltage VBAT and can stably provide a voltage higher than the battery voltage VBAT to the battery charging device 100 based on the battery voltage VBAT.

[0035] According to an exemplary embodiment of this disclosure, the charge pump 111 can output a first voltage higher than the battery voltage VBAT, and the first voltage can be input to the gate controller 112. The first voltage can be the sum of the battery voltage VBAT and a selected power supply voltage. In the exemplary embodiment, the selected power supply voltage can be the maximum power supply voltage selected from the power supply voltages within the chip implementing the mobile device.

[0036] Gate controller 112 can receive a gate control signal and can supply a voltage for driving switching transistor 120. Gate controller 112 can control the voltage supplied to switching transistor 120 and can supply a voltage between battery voltage VBAT and a first voltage. Gate controller 112 can receive the first voltage and can adjust the gate voltage applied to switching transistor 120 according to the gate control signal based on the first voltage. Gate controller 112 can selectively output an appropriate voltage according to the gate control signal and can turn on switching transistor 120 or adjust the power delivery path.

[0037] One end of the gate turn-off switch 113 can be electrically connected to the gate of the gate controller 112 and the switching transistor 120, and the other end of the gate turn-off switch 113 can be connected to a ground node. When the gate turn-off switch 113 is turned on, the gate of the switching transistor 120 can be connected to the ground node. When the gate of the switching transistor 120 is connected to the ground node, the body terminal of the switching transistor 120 can be connected to the ground node, and no current can flow to the battery voltage node 102. In other words, the state in which the gate turn-off switch 113 is turned on can be a state in which the battery charging device 100 completely blocks the power transmission path, and can be a state in which the mobile device does not use any power stored in the battery at all.

[0038] When gate turn-off switch 113 is off, the gate of switching transistor 120 can be disconnected from the ground node and can receive the voltage output from gate controller 112. When gate turn-off switch 113 is off and voltage is supplied to the gate of switching transistor 120, the body terminal of switching transistor 120 can be disconnected from the ground node and can be connected to battery voltage node 102. In other words, the gate turn-off switch 113 can be off in any state except the state in which the battery charging device 100 completely blocks the power transmission path, and it can be a state in which the mobile device uses the power stored in the battery. However, this disclosure is not limited to this, and when gate turn-off switch 113 is off, the mobile device can use the charger output voltage without using the power stored in the battery.

[0039] The switching transistor 120 can be turned on or off to control the flow of current. Depending on the voltage supplied to the gate or body terminals of the switching transistor 120, the power path can be opened or closed, or the voltage can be switched. According to an example embodiment of this disclosure, depending on the voltage applied to the gate, the switching transistor 120 can be turned on to provide a power supply path or can be turned off to block a power supply path.

[0040] For example, when charging the battery, the switching transistor 120 can form a power supply path from system voltage node 101 to battery voltage node 102. When using power stored in the battery, the switching transistor 120 can form a power supply path from battery voltage node 102 to system voltage node 101.

[0041] The switching transistor 120 may have a triple-well structure, wherein a first well region and a second well region disposed within the first well region and providing a body terminal are electrically connected to each other. The first well region may be doped with a first impurity, and the second well region may be doped with a second impurity different from the first impurity. When regions doped with different impurities are adjacent to each other, parasitic paths that impede current flow may be formed. To prevent the formation of parasitic paths in the switching transistor 120, the first and second well regions doped with different impurities may be electrically connected. For example, the switching transistor 120 may be an N-type transistor, and the first impurity may be an N-type impurity, and the second impurity may be a P-type impurity. Because the first and second well regions are electrically connected to each other, the battery charging device 100 can provide a stable power delivery path.

[0042] The body region selector 130 can adjust the voltage input to the body region terminal of the switching transistor 120. The body region selector 130 can connect the body region terminal to a ground node to provide a ground voltage, and can connect the body region terminal to a battery voltage node 102 to provide a battery voltage VBAT.

[0043] In an example embodiment, the body region selector 130 may include a voltage detector 131 that outputs a detection signal. The voltage detector 131 can sense the relative ratio of a first voltage generated by the charge pump 111 to the battery voltage VBAT, and can generate a first detection signal. Additionally, the voltage detector 131 can generate a second detection signal that delays the first detection signal for a predetermined period, and a third detection signal obtained by inverting the first detection signal.

[0044] Body selector 130 can connect the body terminal of switching transistor 120 to battery voltage node 102 in response to a first detection signal and a second detection signal generated by voltage detector 131. Body selector 130 can disconnect the body terminal from ground node in response to a third detection signal. For example, the first and second detection signals can be logic high, and the third detection signal can be logic low.

[0045] In the exemplary embodiments of this disclosure, the battery charging device 100 can provide a stable power delivery path by electrically connecting the first and second well regions of the switching transistor 120. Furthermore, by sensing the relative ratio of the first voltage and the battery voltage VBAT in the voltage detector 131 and generating a first detection signal, the voltage of the gate-body region of the switching transistor 120 can be stably maintained, and excessive peak battery current can be prevented from flowing into the battery charging device 100. Therefore, damage to the switching transistor 120 can be prevented, and a battery charging device 100 with improved performance and stable operation can be provided.

[0046] Figure 3 This is a simple view illustrating a switching transistor according to an example embodiment of this disclosure.

[0047] The switching transistor 200 according to an exemplary embodiment of this disclosure may have a tri-well structure. (See reference...) Figure 3 The switching transistor 200 may include a first well region 220 doped with a first impurity, and a second well region 230 disposed within the first well region 220 and doped with a second impurity different from the first impurity. The first well region 220 may be disposed on a substrate 210 doped with the second impurity. The first well region 220 may include a first deep well region 280 doped with the first impurity. For example, the switching transistor 200 may be an N-type transistor, and the first impurity may be an N-type impurity, and the second impurity may be a P-type impurity.

[0048] The switching transistor 200 may include a source region 250 and a drain region 260 disposed in a second well region 230 and doped with a first impurity, and may include a gate 240 disposed between the source region 250 and the drain region 260. A body terminal 270 doped with a second impurity may be disposed in the second well region 230. The body terminal 270 may be electrically connected to the first well region 220 and / or the first deep well region 280.

[0049] The source region 250 of the switching transistor 200 can be connected to a battery voltage node supplying battery voltage, and the drain region 260 can be connected to a system voltage node supplying system voltage. The gate 240 can be connected to a gate drive circuit to receive a first voltage, and the body terminal 270 can be connected to a body selector to receive battery voltage or ground voltage.

[0050] In the comparative example, the highest power supply voltage within the chip driving the mobile device can be input to the first well region 220 and / or the first deep well region 280 of the switching transistor 200 with a triple-well structure, and the lowest voltage within the chip can be input to the body terminal 270. The magnitude of the battery voltage supplied to the source region 250 and the magnitude of the system voltage supplied to the drain region 260 can be dynamically varied. When at least one of the voltages supplied to the source region 250, the system voltage supplied to the drain region 260, the first well region 220, and the body terminal 270 increases or decreases, parasitic diode paths and parasitic bipolar junction transistors (BJTs) that impede current flow can be formed in the switching transistor 200.

[0051] In an example embodiment, a parasitic diode path may be formed in the switching transistor 200. When a region doped with a first impurity and a region doped with a second impurity are adjacent to each other, the parasitic diode path may be formed between regions doped with different impurities. For example, the parasitic diode path may be formed between the second well region 230 and the source region 250.

[0052] When the direction of the parasitic diode path formed is different from the direction of the power supply path of the battery charger, the parasitic diode path may impede the flow of current and may degrade the performance of the battery charger. For example, the parasitic diode path may be formed between the source region 250 and the second well region 230, between the drain region 260 and the second well region 230, between the second well region 230 and the first well region 220, and between the first well region 220 and the substrate 210, and the direction of the parasitic diode path may be formed from the region doped with the second impurity toward the region doped with the first impurity.

[0053] In the switching transistor 200 according to an exemplary embodiment of the present disclosure, the body terminal 270 and the first well region 220 can be electrically connected to prevent the formation of undesirable parasitic diode paths. When the battery charging device completely blocks the power transmission path, the body terminal 270 can be connected to a ground node. Because the body terminal 270 is connected to a ground node, the formation of parasitic diode paths in the switching transistor 200 can be prevented.

[0054] When the battery charging device does not completely block the power transmission path, the body terminal 270 can be connected to the battery voltage node that supplies the battery voltage. When supplying battery voltage to the body terminal 270, a parasitic diode path can be formed that includes a path from the battery voltage to the system voltage. In other words, a parasitic diode path can be formed that includes a path from the body terminal 270, where the battery voltage is supplied, to the drain region 260, where the system voltage is supplied.

[0055] In an example embodiment, a parasitic BJT component may be formed in the switching transistor 200. The parasitic BJT may include an NPN BJT and a PNP BJT. For example, a parasitic NPN BJT component may be formed between a source region 250 and / or a drain region 260 doped with a first impurity, a second well region 230 doped with a second impurity, and a first well region 220 doped with a first impurity. A parasitic PNP BJT component may be formed between a second well region 230 doped with a second impurity, a first well region 220 doped with a first impurity, and a substrate 210 doped with a second impurity. When the parasitic NPN BJT component is turned on and current begins to flow, the parasitic PNP BJT formed adjacent to the parasitic NPN BJT component may also be turned on and current may begin to flow. Due to the positive feedback formed between the parasitic NPN BJT and the parasitic PNP BJT, a relatively high current may flow to the switching transistor 200, and latch-up may occur in the switching transistor 200, or the switching transistor 200 may be damaged.

[0056] In the switching transistor 200 according to an exemplary embodiment of the present disclosure, the body terminal 270 may be electrically connected to the first well region 220, thereby preventing the formation of parasitic BJT components. In other words, the first well region 220 and the body terminal 270, doped with different impurities, may be electrically connected to each other, thereby preventing latch-up due to the formation of parasitic NPN BJTs and parasitic PNPBJTs in the switching transistor 200, or preventing damage to the switching transistor 200.

[0057] In the exemplary embodiments of this disclosure, since the body terminal 270 of the switching transistor 200 is electrically connected to the first well region 220 and / or the first deep well region 280, the formation of parasitic paths that impede the flow of current in the switching transistor 200 can be prevented. Accordingly, damage to the switching transistor 200 can be prevented, and a stable power delivery path can be provided, thereby improving the performance of the battery charging device.

[0058] Figure 4 This is a simplified view illustrating a battery charging device according to an example embodiment of the present disclosure.

[0059] A battery charging device 300 according to an example embodiment of the present disclosure may include a charge pump 310, a gate controller 320, a switching transistor 330, and a voltage detector 350.

[0060] The charge pump 310 can output a first voltage QBATCP and supply the first voltage QBATCP to the gate controller 320. The first voltage QBATCP can be the sum of a second voltage VBAT and a selected power supply voltage VDDA. The second voltage VBAT can be the voltage output from the battery 340, and the selected power supply voltage VDDA can be the maximum power supply voltage selected within the chip implementing the mobile device.

[0061] The gate controller 320 can receive the gate control signal GCS and can provide the voltage for driving the switching transistor 330. The gate controller 320 can receive the first voltage QBATCP output from the charge pump 310 and can selectively output an appropriate voltage according to the gate control signal GCS. The battery charging device 300 can be switched to a state that completely blocks the power transmission path, a state that allows full power transmission, a current control state, a voltage control state, etc., according to the gate control signal GCS.

[0062] When the gate turn-off switch GS is turned on, the battery charging device 300 can operate with the power transmission path completely blocked. The gate GATE of the switching transistor 330 can be connected to a ground node supplying ground voltage, and the body terminal BODY of the switching transistor 330 can also be connected to a ground node.

[0063] When the gate turn-off switch GS is turned off, the battery charging device 300 can operate in any state except when the power transmission path is completely blocked. When the gate turn-off switch GS is turned off, the body terminal BODY of the switching transistor 330 can be connected to the battery voltage node 302 that supplies the second voltage VBAT.

[0064] The switching transistor 330 may have a triple-well structure, wherein a first well region TW and a second well region disposed within the first well region TW and providing a body terminal BODY are electrically connected to each other. The source region of the switching transistor 330 can be connected to the battery 340 via battery voltage node 302. The drain region of the switching transistor 330 can be connected to an external power supply and the system via system voltage node 301. The body terminal BODY of the switching transistor 330 can be connected to a body selector.

[0065] The body region selector can generate a first detection signal DET1 using a first voltage QBATCP and a second voltage VBAT, and can adjust the voltage supplied to the body region terminal BODY. The body region selector can sense the relative ratio of the first voltage QBATCP and the second voltage VBAT, and can generate a logic high first detection signal DET1 when the first voltage QBATCP increases to a level higher than the second voltage VBAT. In an exemplary embodiment, sensing the relative ratio of the first voltage QBATCP to the second voltage VBAT can mean comparing a value obtained by multiplying the first voltage QBATCP by a first coefficient with a value obtained by multiplying the second voltage VBAT by a second coefficient different from the first coefficient. For example, the first coefficient and the second coefficient can be greater than 0 and less than or equal to 1, respectively.

[0066] The body region selector can generate a first detection signal DET1, a second detection signal DET2 that delays the first detection signal DET1 for a predetermined time, and a third detection signal DET3 obtained by inverting the first detection signal DET1. In an example embodiment, the predetermined time can be determined based on the capacity of the battery 340 and the value of the first resistor R1. The body region selector can supply a second voltage VBAT to the body region terminal BODY in response to the first detection signal DET1 and the second detection signal DET2, and can supply a ground voltage to the body region terminal BODY in response to the third detection signal DET3.

[0067] refer to Figure 4 The body region selector may include a first switch SW1 connected between the body region terminal BODY and the battery voltage node 302 and turned on in response to a first detection signal DET1; a second switch SW2 connected in parallel with the first switch SW1 between the body region terminal BODY and the battery voltage node 302 and turned on in response to a second detection signal DET2; and a third switch SW3 connected between the body region terminal BODY and the ground node and turned on in response to a third detection signal DET3.

[0068] Additionally, the body region selector may include a first resistor R1 connected between the body region terminal BODY and the first switch SW1, and a second resistor R2 connected between the body region terminal BODY and the third switch SW3. In an example embodiment, the first resistor R1 may be connected between the first switch SW1 and the battery voltage node 302, and the second resistor R2 may be connected between the third switch SW3 and the ground node. For example, the amplitude of the first resistor R1 may be greater than the amplitude of the second resistor R2.

[0069] The body selector may include a voltage detector 350 that generates first detection signals DET1 to third detection signals DET3. The voltage detector 350 receives a first voltage QBATCP and a second voltage VBAT, and compares the first voltage QBATCP and the second voltage VBAT to output the first detection signal DET1. By comparing the relative ratio of the first voltage QBATCP and the second voltage VBAT to control the voltage supplied to the body terminal BODY, the body selector can change the voltage supplied to the body terminal BODY while maintaining the gate-body voltage within a stable range that prevents damage to the switching transistor 330. This gate-body voltage is the difference between the gate voltage GATE and the voltage at the body terminal BODY.

[0070] The debounce delay circuit 360 and inverter 370 can be connected to the output terminals of the voltage detector 350. The debounce delay circuit 360 can receive a first detection signal DET1 and output a second detection signal DET2 delayed for a predetermined time. For example, the predetermined time can be determined based on the capacity of the battery 340 and the magnitude of the first resistor R1. The inverter 370 can receive the first detection signal DET1 and output a third detection signal DET3 obtained by inverting the first detection signal DET1.

[0071] When the battery charging device 300 completely blocks the power transmission path, the gate (GATE) of the switching transistor 330 can be connected to the ground node, and the body terminal (BODY) can also be connected to the ground node. When the battery charger 300 completely blocks the power transmission path, the battery 340 can be in a discharging state or in a state where it is not charged by an external power source.

[0072] To switch the battery charger 300 from a state where the power transmission path is completely blocked to a state where full power transmission is allowed, the gate turn-off switch GS connected to both the gate GATE of the switching transistor 330 and the ground node can be turned off. The gate controller 320 can receive the gate control signal GCS and can supply a first voltage QBATCP to the gate GATE of the switching transistor 330.

[0073] The charge pump 310 can output a first voltage QBATCP, which can be input to the gate controller 320. When the first voltage QBATCP is at a level lower than the second voltage VBAT, the voltage detector 350 can generate a logic-low first detection signal DET1. In response to the first detection signal DET1, the first switch SW1 can be turned off, and in response to the third detection signal DET3, the third switch SW3 can be turned on. Therefore, the body terminal BODY can be connected to the ground node, and a ground voltage can be provided to the body terminal BODY.

[0074] The gate voltage can increase with the same trend as the first voltage QBATCP output from charge pump 310. When the first voltage QBATCP increases to a level higher than the second voltage VBAT, voltage detector 350 can generate a logic high first detection signal DET1. In response to the first detection signal DET1, the first switch SW1 can be turned on, and in response to the third detection signal DET3, the third switch SW3 can be turned off. With the first switch SW1 turned on, the second voltage VBAT can be supplied to the body terminal BODY through the first resistor R1.

[0075] When the voltage at the body terminal BODY suddenly changes from ground to the second voltage VBAT, the threshold voltage of the switching transistor 330 may change due to the body effect. When the threshold voltage of the switching transistor 330 changes, an excessively large peak battery current may occur at the battery voltage node 302 in the direction towards the system voltage node 301, which could damage the switching transistor 330 or degrade the performance of the battery charging device 300. Accordingly, the second voltage VBAT can be slowly supplied to the body terminal BODY through the first resistor R1, thereby preventing the voltage at the body terminal BODY from rapidly changing from ground to the second voltage VBAT.

[0076] The debounce delay circuit 360 can also output a second detection signal DET2 that delays the first detection signal DET1 for a predetermined period. In response to the second detection signal DET2, the second switch SW2 can be turned on, and the body terminal BODY can be directly connected to the battery voltage node 302. Because the body terminal BODY and the battery voltage node 302 are directly connected, the second voltage VBAT can be stably supplied to the body terminal BODY.

[0077] When the gate turn-off switch GS is turned on, the battery charger 300 can switch from a state that allows full power transfer to a state that completely blocks the power transfer path. It can interrupt the supply of the first voltage QBATCP to the gate GATE and can supply ground voltage, and it can also interrupt the supply of the second voltage VBAT and can supply ground voltage to the body terminal BODY.

[0078] When the first rate at which the gate voltage drops from the first voltage QBATCP to ground and the second rate at which the body terminal voltage BODY drops from the second voltage VBAT to ground differ from each other, the switching transistor 330 may be damaged as the gate-body voltage increases. To prevent damage to the switching transistor 330, a second resistor R2 can be placed between the body terminal BODY and the ground node. By controlling the value of the second resistor R2, the second rate at which the voltage at the body terminal BODY drops from the second voltage VBAT to ground can be adjusted.

[0079] According to an example embodiment of this disclosure, a battery charging device 300 may include a switching transistor 330 having a triple-well structure, in which a first well region and a second well region disposed within the first well region and providing a body terminal BODY are electrically connected to each other, thereby blocking parasitic paths formed in the switching transistor 330 and providing a smooth power delivery path for the battery charging device 300. A body selector included in the battery charging device 300 can sense the relative ratio of a first voltage QBATCP and a second voltage VBAT, and can control the voltage supplied to the body terminal BODY, such that the gate-body voltage can be maintained within a stable range that prevents damage to the switching transistor 330. The performance of the battery charging device 300 can be improved by providing a smooth power delivery path and stably maintaining the gate-body voltage.

[0080] Figures 5 to 8 This is a view that simply illustrates a body region selector according to an example embodiment of this disclosure.

[0081] First of all, Figure 5 In the example embodiment shown, the body region selector 400 may include a multiplexer 410, a comparator 420, a latch 430, a debouncing delay circuit 440, and an inverter 450.

[0082] The body region selector 400 can sense the relative ratio of the first voltage QBATCP and the second voltage VBAT. A first sensing resistor SR1 and a second sensing resistor SR2 can be connected in series between the first voltage node 401 supplying the first voltage QBATCP and the ground node supplying the ground voltage. For example, the first sensing resistor SR1 can be larger than the second sensing resistor SR2. However, this disclosure is not limited thereto.

[0083] The third sensing resistor SR3, the fourth sensing resistor SR4, and the fifth sensing resistor SR5 can be connected in series between the second voltage node 402 supplying the second voltage VBAT and the ground node. For example, the third sensing resistor SR3 can be larger than the fourth sensing resistor SR4, and the fourth sensing resistor SR4 can be larger than the fifth sensing resistor SR5. However, this disclosure is not limited thereto.

[0084] Multiplexer 410 can select and output one of a first sensing voltage SV1 applied to the fourth sensing resistor SR4 and the fifth sensing resistor SR5, and a second sensing voltage SV2 applied to the fifth sensing resistor SR5. For example, the value obtained by multiplying the second voltage VBAT by a second coefficient can be either the first sensing voltage SV1 or the second sensing voltage SV2. When the value obtained by multiplying the second voltage VBAT by the second coefficient is the first sensing voltage SV1, the second coefficient can be the value obtained by dividing the sum of the fourth sensing resistor SR4 and the fifth sensing resistor SR5 by the sum of the third sensing resistor SR3, the fourth sensing resistor SR4, and the fifth sensing resistor SR5. When the value obtained by multiplying the second voltage VBAT by the second coefficient is the second sensing voltage SV2, the second coefficient can be the value obtained by dividing the fifth sensing resistor SR5 by the sum of the third sensing resistor SR3, the fourth sensing resistor SR4, and the fifth sensing resistor SR5.

[0085] The voltage output from multiplexer 410 can be input to comparator 420. The voltage output from multiplexer 410 can be input to comparator 420 to improve the stability of the signal output from comparator 420. However, this disclosure is not limited to... Figure 5 The configuration shown is such that the multiplexer 410 may not be included in the body region selector 400.

[0086] Comparator 420 can receive a third sensed voltage SV3 applied to the second sense resistor SR2 and a voltage output from multiplexer 410, and can compare the third sensed voltage SV3 and the output voltage to output a first detection signal DET1. For example, the value obtained by multiplying the first voltage QBATCP by a first coefficient can be the third sensed voltage SV3. When the value obtained by multiplying the first voltage QBATCP by the first coefficient is the third sensed voltage SV3, the first coefficient can be the value obtained by dividing the second sense resistor SR2 by the sum of the first sense resistor SR1 and the second sense resistor SR2. When the level of the third sensed voltage SV3 increases to be higher than the level of the voltage output from multiplexer 410, comparator 420 can output a logic high first detection signal DET1. The first detection signal DET1 output from comparator 420 can be input as a selection signal of multiplexer 410. For example, when the first detection signal DET1 is logic high, multiplexer 410 can output a second sensed voltage SV2. However, this disclosure is not limited to... Figure 5 The configuration shown in the figure is such that either the first sensing voltage SV1 or the second sensing voltage SV2 can be directly input to the comparator 420.

[0087] Latch 430 can store the first detection signal DET1 output from comparator 420. By storing the first detection signal DET1 in latch 430, the voltage supplied to the body terminal of the switching transistor can be maintained even if the first voltage QBATCP temporarily decreases.

[0088] In response to the first detection signal DET1 output from latch 430, the first switch is turned on, and the second voltage VBAT can be supplied to the body region terminal through a resistor element. The debouncing delay circuit 440 connected to the output terminal of latch 430 can output a second detection signal DET2 that delays the first detection signal DET1 for a predetermined time period.

[0089] In response to the second detection signal DET2, the second switch can be turned on and can be directly connected to the second voltage node 402 in the body region terminal. The inverter 450 connected to the output terminal of the latch 430 can output a third detection signal DET3 obtained by inverting the first detection signal DET1. When the first detection signal DET1 is logic high, the third detection signal DET3 can be logic low, and the third switch can be turned off in response to the third detection signal DET3, and the body region terminal can be disconnected from the ground node.

[0090] According to an exemplary embodiment of this disclosure, the body selector 400 can sense the relative ratio of a first voltage QBATCP and a second voltage VBAT, and can adjust the voltage supplied to the body terminals so that the gate-body voltage can be maintained within a range that prevents damage to the switching transistor. The multiplexer 410 can improve the stability of the first detection signal DET1 output from the comparator 420. The latch 430 can stably maintain the voltage supplied to the body terminals even if the first voltage QBATCP is temporarily unstable by outputting the first detection signal DET1 stored in the latch 430. Therefore, a smooth power delivery path can be provided for the battery charger, and the gate-body voltage can be maintained within a stable range, thereby improving the performance of the battery charger.

[0091] according to Figure 6 The body region selector 400a of the example embodiment shown above can be shared with the above. Figure 5 The technical features of the volume region selector 400 described herein are the same as or equivalent to those described herein. Accordingly, simplified or omitted features will be used. Figure 5 The configurations described in the document overlap.

[0092] exist Figure 6 In the example embodiment shown, the body region selector 400a may include a multiplexer 410a, a comparator 420a, a debouncing delay circuit 440a, and an inverter 450a.

[0093] Multiplexer 410a can receive a first sense voltage SV1 and a second sense voltage SV2, and can output one of the first sense voltage SV1 and the second sense voltage SV2. The voltage output from multiplexer 410a can be input to comparator 420a.

[0094] The voltage output from multiplexer 410a and the third sensed voltage SV3 can be input to comparator 420a, and a first detection signal DET1 can be output. When the third sensed voltage SV3 is greater than the voltage output from multiplexer 410a, comparator 420a can output the logic high first detection signal DET1. The first detection signal DET1 can be input as a selection signal for multiplexer 410a.

[0095] When the first switch is turned on in response to the first detection signal DET1, the body region selector 400a can connect the body region terminal to the second voltage node 402a via a resistor. When the second switch is turned on in response to the second detection signal DET2 output from the debouncing delay circuit 440a, the body region selector 400a can directly connect the body region terminal to the second voltage node 402a. When the third switch is turned off in response to the third detection signal DET3 output from the inverter 450a, the body region selector 400a can disconnect the body region terminal from the ground node.

[0096] According to an exemplary embodiment of this disclosure, the body region selector 400a can sense the relative ratio of a first voltage QBATCP and a second voltage VBAT, and can adjust the voltage supplied to the body region terminals so that the gate-body region voltage can be maintained within a range that will not damage the switching transistor. The multiplexer 410a can also improve the stability of the first detection signal DET1 output from the comparator 420a. Therefore, the gate-body region voltage can be stably maintained to improve the performance of the battery charging device.

[0097] according to Figure 7 The body region selector 400b of the example embodiment shown can be shared with the above. Figure 5 The technical features are the same or equivalent to those of the volume region selector 400 described herein. Accordingly, simplifications or omissions will be made. Figure 5 The configurations described in the document overlap.

[0098] exist Figure 7 In the example embodiment shown, the body region selector 400b may include a comparator 420b, a debouncing delay circuit 440b, and an inverter 450b. Figure 5 The multiplexer 410 and latch 430 shown may not be included in Figure 7 The example embodiment shown.

[0099] refer to Figure 7The first sensing resistor SR1 and the second sensing resistor SR2 can be connected in series between the first voltage node 401b supplying the first voltage QBATCP and the ground node supplying the ground voltage. The third sensing resistor SR3 and the fourth sensing resistor SR4 can be connected in series between the second voltage node 402b supplying the second voltage VBAT and the ground node.

[0100] Comparator 420b compares a first sensing voltage SV1' applied to a fourth sensing resistor SR4 with a second sensing voltage SV2' applied to a second sensing resistor SR2 to output a first detection signal DET1. The first sensing voltage SV1' can be a value obtained by multiplying a second voltage VBAT by a second coefficient, and the second sensing voltage SV2' can be a value obtained by multiplying a first voltage QBATCP by a first coefficient. The second coefficient can be a value obtained by dividing the fourth sensing resistor SR4 by the sum of the third sensing resistor SR3 and the fourth sensing resistor SR4, and the first coefficient can be a value obtained by dividing the second sensing resistor SR2 by the sum of the first sensing resistor SR1 and the second sensing resistor SR2. For example, when the second sensing voltage SV2' is greater than the first sensing voltage SV1', comparator 420b can output a logic high first detection signal DET1.

[0101] According to an example embodiment of this disclosure, the body selector 400b senses the relative ratio of a first voltage QBATCP and a second voltage VBAT, and can adjust the voltage supplied to the body terminals to maintain the gate-body voltage within a range that prevents damage to the switching transistor. Therefore, the gate-body voltage can be stably maintained to improve the performance of the battery charging device.

[0102] according to Figure 8 The body region selector 400c shown in the example embodiment can be shared with Figure 7 The technical features are the same or equivalent to those of the body region selector 400b shown in the figure. Accordingly, simplifications or omissions will be made. Figure 7 The configurations described in the document overlap.

[0103] exist Figure 8 In the example embodiment shown, the body region selector 400c may include a comparator 420c, a latch 430c, a debouncing delay circuit 440c, and an inverter 450c. Figure 8 The body region selector 400c shown can be added by adding latch 430c. Figure 7 The body region selector 400b shown is used to obtain it.

[0104] Comparator 420c can compare the first sensed voltage SV1' and the second sensed voltage SV2', and can output a first detection signal DET1. The first detection signal DET1 output from comparator 420c can be stored in latch 430c. In the example embodiment of this disclosure, by storing the first detection signal DET1 in latch 430c, even if the first voltage QBATCP is temporarily unstable, body region selector 400c can stably maintain the voltage supplied to the body region terminal.

[0105] According to an exemplary embodiment of this disclosure, the body region selector 400c can sense the relative ratio of a first voltage QBATCP and a second voltage VBAT, and can adjust the voltage supplied to the body region terminals so that the gate-body region voltage can be maintained within a range that prevents damage to the switching transistor. Even if the first voltage QBATCP is temporarily unstable, the latch 430c can stably maintain the body region voltage by outputting a first detection signal DET1. Therefore, the gate-body region voltage can be stably maintained to improve the performance of the battery charging device.

[0106] Figure 9 and Figure 10 This is a view illustrating the operation of a battery charging device according to an example embodiment of the present disclosure.

[0107] According to an example embodiment of the present disclosure, the body region selector can sense the relative ratio of a first voltage to a second voltage VBAT that is different from the first voltage, such that the difference between the gate voltage VGATE of the switching transistor and the body region voltage VBODY can be stably maintained, and the body region voltage VBODY can be switched even if the second voltage VBAT decreases.

[0108] First, refer to Figure 9 The battery charging device can switch from a state where the power transmission path is completely blocked to a state where full power transmission is allowed. The gate controller can receive a first voltage output from the charge pump and can supply the first voltage to the gate of the switching transistor. The first voltage output from the charge pump and the gate voltage VGATE can increase in the same trend. Regardless of the state of the battery charging device, the second voltage VBAT can be maintained at VB1.

[0109] The first voltage can increase the first target voltage VP1, and the gate voltage VGATE can also increase the first target voltage VP1 in the same trend as the first voltage. The first voltage can be a value obtained by adding a selected power supply voltage to a second voltage VBAT. In an example embodiment, the selected power supply voltage can be the maximum power supply voltage selected from the power supply voltages within the chip implementing the mobile device.

[0110] As the gate voltage VGATE increases, it can reach a first trigger voltage VT1. The first trigger voltage VT1 can be a voltage with a level lower than the first target voltage VP1, and it can be determined based on a second voltage VBAT. At the first time point S1 when the gate voltage VGATE reaches the first trigger voltage VT1, the body selector can generate a logic high first detection signal.

[0111] At a first time point S1, the body region selector can generate a first detection signal and a third detection signal obtained by inverting the first detection signal. In response to the third detection signal, the body region terminal can be disconnected from the ground node, and the body region terminal can be connected to a second voltage node supplying the second voltage VBAT via a resistor element in response to the first detection signal. Since the body region terminal receives the second voltage VBAT via the resistor element, the body region voltage VBODY can slowly increase from the ground voltage to the second voltage VBAT.

[0112] In an exemplary embodiment of this disclosure, the first trigger voltage VT1, which begins to output a logic high first detection signal when the body selector senses the relative ratio of the first voltage and the second voltage VBAT, can also be dynamically variable. As the level of the second voltage VBAT decreases, the first trigger voltage VT1 can also decrease. Since the first trigger voltage VT1 is determined based on the second voltage VBAT, it is ensured that the body voltage VBODY increases from the second voltage VBAT even when the second voltage VBAT decreases. By ensuring that the body voltage VBODY increases from ground voltage to the second voltage VBAT, damage to the switching transistor due to the difference between the gate voltage VGATE and the body voltage VBODY can be prevented.

[0113] Let's refer to each other. Figure 9 and Figure 10 , Figure 10 The second voltage VBAT shown may be lower than Figure 9 The second voltage VBAT is shown in the figure. For example, Figure 10 The example embodiment shown illustrates a situation where the battery is discharged, and the discharged battery can supply a second voltage VBAT with a level lower than that under normal conditions. However, the decrease in the level of the second voltage VBAT is not limited to the case of a discharged battery, but can also occur in other situations such as when the battery is aging. When the level of the second voltage VBAT decreases, the first voltage generated based on the second voltage VBAT may also decrease.

[0114] refer to Figure 10The battery charging device can be controlled to allow full power transfer even when the power transfer path is completely blocked. The first voltage and the gate voltage VGATE output from the charge pump can increase in the same direction. Regardless of the state of the battery charging device, the second voltage VBAT can be maintained at VB2. The first voltage can increase the second target voltage VP2, and the gate voltage VGATE can also increase the second target voltage VP2 in the same direction as the first voltage. The first voltage can be a value obtained by adding a selected supply voltage to the second voltage VBAT.

[0115] With the gate voltage VGATE increasing, it can reach the second trigger voltage VT2. The second trigger voltage VT2 is a voltage with a level lower than the second target voltage VP2, and can be determined based on the second voltage VBAT. At the second time point S2 when the gate voltage VGATE reaches the second trigger voltage VT2, the body selector can generate a logic high first detection signal.

[0116] At the second time point S2, the body selector can generate a first detection signal and a third detection signal obtained by inverting the first detection signal. In response to the third detection signal, the body terminal of the switching transistor can be disconnected from the ground node, and in response to the first detection signal, the body terminal can be connected to a second voltage node supplying the second voltage VBAT via a resistor element. Since the second voltage VBAT is supplied to the body terminal through the resistor element, the body voltage VBODY can slowly increase from the ground voltage to the second voltage VBAT.

[0117] In the exemplary embodiments of this disclosure, since the second trigger voltage VT2 is determined based on the second voltage VBAT, the battery charging device can ensure an increase in the body voltage VBODY. When the level of the second voltage VBAT decreases, the level of the second trigger voltage VT2, which serves as the gate voltage VGATE for starting the output of the first detection signal, can also decrease. Because the second trigger voltage VT2 is determined based on the second voltage VBAT, it can be ensured that even if the second voltage VBAT decreases, the body voltage VBODY increases from the ground voltage to the second voltage VBAT. By ensuring that the body voltage VBODY increases from the ground voltage to the second voltage VBAT, damage to the switching transistor due to the difference between the gate voltage VGATE and the body voltage VBODY can be prevented.

[0118] According to an example embodiment of this disclosure, a body region selector can relatively compare a first voltage with a second voltage VBAT that is different from the first voltage, and then sense the result of the comparison. While the first voltage increases, when the first voltage reaches a trigger voltage higher than the second voltage VBAT, the body region selector can generate a first detection signal. In response to the first detection signal, the body region selector can supply the second voltage VBAT to the body region terminal. The trigger voltage can be determined based on the second voltage VBAT, and when the second voltage VBAT decreases, the trigger voltage can also decrease.

[0119] In the comparison example, the body selector can compare the relative ratio of a reference voltage with a fixed value and a first voltage, and then sense the result of the comparison. When the first voltage is greater than the reference voltage, the body selector can generate a logic high first detection signal. In an example embodiment, when the second voltage VBAT decreases, the first voltage generated from the second voltage VBAT can also decrease. When the decreased first voltage is at a level lower than the reference voltage, the body selector may not generate a logic high first detection signal. Therefore, even if the first voltage is supplied to the gate, the body terminal may not be disconnected from the ground node.

[0120] The body region selector according to an exemplary embodiment of this disclosure can compare a first voltage and a second voltage VBAT, rather than a reference voltage, and then sense the result of the comparison, such that a first detection signal can be generated even if both the first voltage and the second voltage VBAT decrease. When the second voltage VBAT decreases, the trigger voltage that starts generating the first detection signal also decreases, allowing the body region selector to ensure that the body region voltage VBODY increases from ground voltage to the second voltage VBAT. Therefore, the difference between the gate voltage VGATE of the switching transistor and the body region voltage VBODY can be stably maintained, and the performance of the battery charging device can be improved.

[0121] Figures 11 to 15 This is a view illustrating the operation of a battery charging device according to an example embodiment of the present disclosure.

[0122] First, let's refer to each other. Figure 11 and Figure 12Before the first time point T1, the battery charging device 500 can operate with the power transmission path completely blocked. The gate turn-off switch GS can be connected to a ground node supplying ground voltage, and the gate voltage VGATE can be the ground voltage. The first detection signal DET1 controlling the first switch SW1 can be logic low and is obtained by inverting the first detection signal DET1, and the third detection signal DET3 controlling the third switch SW3, obtained by inverting the first detection signal DET1, can be logic high. In response to the third detection signal DET3, the third switch SW3 can be turned on, and the body terminal can be connected to the ground node. Therefore, the body voltage VBODY can be the ground voltage, and the gate voltage VGATE and the body voltage VBODY can be substantially the same voltage. For example, the gate-body voltage VGB, which is the difference between the gate voltage VGATE and the body voltage VBODY, can be 0.

[0123] When the battery charging device 500 completely blocks the power transmission path, the second voltage VBAT of the battery voltage node 502 can be maintained at a constant voltage. For example, the battery can be isolated from an external power source. Before the first time point T1, the charge pump may not output the first voltage QBATCP, and may not supply the first voltage QBATCP to the gate controller 510. Before the first time point T1, both the first voltage QBATCP and the gate voltage VGATE can be grounded.

[0124] Let's refer to each other. Figure 11 and Figure 13 The battery charging device 500 can switch to a state allowing full power transfer after a first time point T1. After the first time point T1, the gate turn-off switch GS can be turned off, and the gate of the switching transistor 520 can be isolated from the ground node. The gate controller 510 can receive a first voltage QBATCP and can supply the first voltage QBATCP to the gate of the switching transistor 520 according to the gate control signal. Therefore, as Figure 11 As shown, after the first time point T1, the gate voltage VGATE can increase with a trend that is substantially the same as the first voltage QBATCP.

[0125] After the first time point T1, the battery charger 500 can operate in a state that allows full power transmission and can supply voltage from the battery voltage node 502 that supplies the second voltage VBAT to the system voltage node 501 that supplies the system voltage VSYS, and the battery current IBAT can flow in the direction in which the second voltage VBAT is discharged.

[0126] At the same time, such as Figure 11As shown, even after the first time point T1, the first detection signal DET1 can remain in a logic low state. Therefore, in response to the third detection signal DET3, in which the first detection signal DET1 is inverted, the third switch SW3 can remain on, and the body terminal can be connected to the ground node. After the first time point T1, the body voltage VBODY can be the ground voltage, and the gate voltage VGATE increases with the same trend as the first voltage QBATCP, causing the gate-body voltage VGB (which is the difference between the gate voltage VGATE and the body voltage VBODY) to increase.

[0127] Let's refer to each other. Figure 11 and Figure 14 The system voltage VSYS can reach the second voltage VBAT at a second time point T2 after the first time point T1. The gate voltage VGATE can increase with the same trend as the first voltage QBATCP output from the charge pump. The body selector can sense the relative ratio of the first voltage QBATCP and the second voltage VBAT output from the charge pump, and can generate a logic high first detection signal DET1 when the increase in the first voltage QBATCP is higher than the increase in the second voltage VBAT.

[0128] For example, the first voltage QBATCP can be the voltage output from the charge pump, and the second voltage VBAT can be the battery voltage. The first voltage QBATCP can be a voltage obtained by adding the second voltage VBAT to a selected power supply voltage. In an example embodiment, the selected power supply voltage can be the maximum power supply voltage selected from the power supply voltages within the chip implementing the mobile device.

[0129] At a second time point T2, the first switch SW1 can be turned on in response to the first detection signal DET1. The body terminal can be connected to the battery voltage node 502, which supplies the second voltage VBAT through the first resistor R1, and the body voltage VBODY can be slowly increased from the ground voltage to the second voltage VBAT through the first resistor R1. The third switch SW3 can be turned off in response to the third detection signal DET3 obtained by inverting the first detection signal DET1, and the body terminal can be disconnected from the ground node.

[0130] According to an exemplary embodiment of the present disclosure, the battery charging device 500 can turn on the first switch SW1 at a second time point T2 as the gate-body voltage VGB, which is the difference between the gate voltage VGATE and the body voltage VBODY, increases, thus preventing damage to the switching transistor 520. Since the second voltage VBAT is supplied to the body terminal through the first switch SW1 turned on at the second time point T2, as... Figure 11As shown in the diagram, the body voltage VBODY can be increased from the second time point T2. Therefore, due to the increase in the gate voltage VGATE, the gate-body voltage VGB can be prevented from exceeding the maximum voltage that the switching transistor 520 can withstand, and damage to the switching transistor 520 can be prevented.

[0131] Let's refer to each other. Figure 11 and Figure 15 The body region voltage VBODY can reach the second voltage VBAT at a third time point T3, following the second time point T2. At the third time point T3, the body region selector can generate a second detection signal DET2 that delays the first detection signal DET1 for a predetermined time period. For example, the predetermined time can be determined based on the capacity of battery 530 and the first resistor R1.

[0132] In an example embodiment, the time taken for the gate voltage VGATE to separate from the ground node and reach the first voltage QBATCP can be longer than the predetermined time taken for the first detection signal DET1 to be input to the debouncing delay circuit and for the second detection signal DET2 to be output. (See reference...) Figure 11 The scheduled time can be from the second time point T2 to the third time point T3.

[0133] In response to the second detection signal DET2, the second switch SW2 can be turned on, and the battery voltage node 502 supplying the second voltage VBAT can be short-circuited with the body terminal. For example, when the second switch SW2 is turned on, the battery voltage node 502 can be short-circuited with the body terminal. When the battery voltage node 502 and the body terminal are short-circuited, the second voltage VBAT can be stably supplied to the body terminal.

[0134] refer to Figure 11 At a fourth time point T4, following the third time point T3, the battery charging device 500 can switch from a state allowing full power transmission to a state completely blocking the power transmission path. When the gate turn-off switch GS is connected to the ground node, the battery charging device 500 can operate in the state of completely blocking the power transmission path.

[0135] At time point T4, the charge pump stops outputting the first voltage QBATCP, and therefore, the first voltage QBATCP is not supplied to the gate. The body selector can generate a logic high third detection signal DET3, and in response to the third detection signal DET3, the third switch SW3 can be turned on, and the body terminal can be connected to the ground node. Since the body terminal and the gate are each connected to the ground node, the gate voltage VGATE and the body voltage VBODY can be substantially the same voltage. For example, the gate-body voltage VGB, which is the difference between the gate voltage VGATE and the body voltage VBODY, can be 0.

[0136] Figure 16 This is a flowchart illustrating an operation method of a battery charging device according to an example embodiment of the present disclosure.

[0137] A battery charging device according to an example embodiment of this disclosure may include a gate drive circuit, a switching transistor, and a body region selector. The switching transistor may have a triple-well structure, wherein a first well region and a second well region disposed within the first well region and providing a body region terminal are electrically connected to each other. The gate drive circuit may regulate the voltage supplied to the gate of the switching transistor, and the body region selector may regulate the voltage supplied to the body region terminal of the switching transistor.

[0138] When the battery charging device is in a state where the power transmission path is completely blocked, the gate of the switching transistor can be connected to a ground node, and the body terminal of the switching transistor can also be connected to a ground node. For example, when the battery charging device is in a state where the power transmission path is completely blocked, the battery can be in a discharging state or can be charged without an external power source.

[0139] To switch the battery charger from a state where the power transmission path is completely blocked to a state where full power transmission is allowed, the gate turn-off switch connected between the gate of the switching transistor and the ground node can be turned off. The gate turn-off switch can be turned off so that the gate of the switching transistor can be disconnected from the ground node. The gate controller can receive a gate control signal for switching the battery charger to a state where full power transmission is allowed.

[0140] With the body region terminal connected to the ground node, a first voltage can be supplied to the gate of the switching transistor (S100). The gate controller can receive the first voltage from the charge pump and can supply the first voltage to the gate via a gate control signal. The first voltage output from the charge pump and the gate voltage can increase in the same direction. The first voltage can be the sum of a second voltage different from the first voltage and a selected power supply voltage. In an example embodiment, the selected power supply voltage can be the maximum power supply voltage selected from the power supply voltages within the chip implementing the mobile device.

[0141] The body region selector can compare a second voltage, which is different from the first voltage, with the first voltage (S110). According to an exemplary embodiment of this disclosure, the body region selector can sense the relative ratio of the first voltage and the second voltage and can control the voltage supplied to the body region terminal. The relative ratio of the first voltage and the second voltage can be compared to ensure that the body region voltage is switched. By ensuring that the body region voltage increases from ground voltage to the second voltage, the gate-body region voltage can be prevented from exceeding the maximum voltage that the switching transistor can withstand due to the increase in gate voltage, and damage to the switching transistor can be prevented.

[0142] When the value obtained by multiplying the first voltage by the first coefficient is less than the value obtained by multiplying the second voltage by the second coefficient, the body terminal can be connected to the ground node (S120). When the value obtained by multiplying the first voltage supplied to the gate by the first coefficient is less than the value obtained by multiplying the second voltage by the second coefficient, even if the ground voltage is supplied to the body terminal, the gate-body voltage may be at a level lower than the maximum voltage that the switching transistor can withstand. Therefore, the switching transistor may not be damaged.

[0143] When the value obtained by multiplying the first voltage by the first coefficient is greater than the value obtained by multiplying the second voltage by the second coefficient, the body terminal can be disconnected from the ground node, and a second voltage can be supplied to the body terminal through a resistor element (S130). When the body voltage increases rapidly, a peak battery current may flow in the direction of battery discharge, potentially damaging the battery charging circuit. To prevent the body voltage from increasing rapidly, the body selector can supply a second voltage to the body terminal through a resistor element. When the second voltage is supplied to the body terminal through the resistor element, the body voltage can slowly increase from the ground voltage to the second voltage. As the body voltage increases slowly, the battery charging device can prevent the gate-body voltage from exceeding the maximum voltage that the switching transistor can withstand, and can prevent damage to the switching transistor.

[0144] When the body region voltage reaches the second voltage and a predetermined time has elapsed, the node supplying the second voltage can be short-circuited with the body region terminal (S140). The body region selector can stably supply the second voltage to the body region terminal by directly connecting the body region terminal to the node supplying the second voltage.

[0145] According to an exemplary embodiment of this disclosure, the switching transistor may have a triple-well structure in which a first well region and a second well region disposed within the first well region and providing a body region terminal are electrically connected to each other, thereby blocking parasitic paths formed in the switching transistor and providing a smooth power delivery path for the battery charging device. A body region selector included in the battery charger can sense the relative ratio of a first voltage and a second voltage to control the voltage supplied to the body region terminal, thereby preventing the gate-body voltage from exceeding the maximum voltage that the switching transistor can withstand and preventing damage to the switching transistor.

[0146] This disclosure is not limited to the above embodiments and drawings, but is defined by the appended claims. Therefore, those skilled in the art can make various substitutions, modifications, or changes without departing from the scope of this disclosure as defined by the appended claims, and such substitutions, modifications, or changes should be construed as being included within the scope of this disclosure.

Claims

1. A battery charging device, comprising: A switching transistor includes a first well region doped with a first impurity, a second well region disposed in the first well region and doped with a second impurity different from the first impurity, a source region and a drain region disposed in the second well region and doped with the first impurity, a body region terminal disposed in the second well region and doped with the second impurity and electrically connected to the first well region, and a gate disposed between the source region and the drain region. A gate driving circuit, the gate driving circuit including a gate controller and a gate turn-off switch, the gate controller receiving a first voltage and adjusting the gate voltage input to the gate, the gate turn-off switch being connected between a ground node supplying a ground voltage and the gate; and A body region selector that uses a first voltage and a second voltage different from the first voltage to generate a first detection signal, and adjusts the voltage supplied to the body region terminals. The body region selector connects the body region terminal to the node supplying the second voltage in response to the first detection signal and a second detection signal that delays the first detection signal for a predetermined period of time, and connects the body region terminal to the ground node in response to a third detection signal obtained by inverting the first detection signal.

2. The battery charging device according to claim 1, wherein the body region selector comprises: A first switch is connected between the body region terminal and the node supplying the second voltage, and is turned on in response to the first detection signal; A second switch is connected in parallel with the first switch between the body region terminal and the node supplying the second voltage, and is turned on in response to the second detection signal; A third switch is connected between the body region terminal and the grounding node, and is turned on in response to the third detection signal; A first resistor is connected between the body region terminal and the first switch; and The second resistor is connected between the body region terminal and the third switch.

3. The battery charging device according to claim 2, wherein the predetermined time is determined based on the resistance of the first resistor.

4. The battery charging device according to claim 1, wherein the body region selector comprises: A first sensing resistor and a second sensing resistor are connected in series between the node supplying the first voltage and the ground node; A third sensing resistor and a fourth sensing resistor are connected in series between the node supplying the second voltage and the ground node; and The comparator compares the first sensing voltage applied to the second sensing resistor with the second sensing voltage applied to the fourth sensing resistor, and outputs the first detection signal.

5. The battery charging device according to claim 1, wherein the body region selector comprises: A first sensing resistor and a second sensing resistor are connected in series between the node supplying the first voltage and the ground node; A third sensing resistor, a fourth sensing resistor, and a fifth sensing resistor are connected in series between the node supplying the second voltage and the ground node; A multiplexer selects and outputs one of a first sensing voltage applied to the fourth sensing resistor and the fifth sensing resistor, and a second sensing voltage applied to the fifth sensing resistor; and The comparator compares the third sensing voltage applied to the second sensing resistor with the voltage output from the multiplexer, and outputs the first detection signal.

6. The battery charging device according to claim 5, wherein the body region selector further includes a latch connected to the output terminal of the comparator and storing the first detection signal.

7. The battery charging device according to claim 1, wherein the body region selector further comprises: A debounce delay circuit, wherein the debounce delay circuit delays the first detection signal and outputs the second detection signal during the predetermined time period; and An inverter that obtains the third detection signal by inverting the first detection signal and outputs the third detection signal.

8. The battery charging device according to claim 1, wherein the first voltage is the sum of the second voltage and the selected power supply voltage.

9. The battery charging device according to claim 1, wherein, When the gate turn-off switch is turned on and the gate is connected to the ground node, the body region selector supplies the ground voltage to the body region terminal.

10. The battery charging device according to claim 1, wherein, When the gate turn-off switch is turned off and the gate is disconnected from the ground node, the body region selector supplies the second voltage to the body region terminal.

11. The battery charging apparatus of claim 1, wherein the gate controller receives a gate control signal and determines the voltage supplied to the gate in response to the gate control signal.

12. The battery charging device of claim 1, wherein the second voltage is supplied to the source region and the drain region is connected to the node supplying the system voltage.

13. A method of operating a battery charging device, the battery charging device comprising a switching transistor having a triple-well structure, wherein a first well region and a second well region disposed within the first well region and providing a body terminal are electrically connected to each other, the method comprising: With the body region terminal connected to the ground node, a first voltage is supplied to the gate of the switching transistor. Compare a second voltage, which is different from the first voltage, with the first voltage; When the value obtained by multiplying the first voltage by a first coefficient is greater than the value obtained by multiplying the second voltage by a second coefficient different from the first coefficient, the body terminal is disconnected from the grounding node, and the second voltage is supplied to the body terminal through a resistor element; and When the voltage in the body region reaches the second voltage and a predetermined time has elapsed, the node supplying the second voltage is short-circuited to the body region terminal.

14. The method of operating the battery charging device according to claim 13, wherein, Both the first coefficient and the second coefficient are greater than 0 and less than or equal to 1.

15. The method of operating the battery charging device according to claim 13, further comprising: When the gate is connected to the ground node, the body terminal is connected to the ground node.

16. The method of operating the battery charging device according to claim 13, wherein, When the second voltage is supplied to the body region terminal through the resistor element, the gate voltage is a trigger voltage lower than the first voltage, and the trigger voltage is determined based on the second voltage.

17. The method of operating the battery charging device according to claim 13, wherein, The first time required for the gate voltage to separate from the ground node and reach the first voltage is longer than the predetermined time.

18. The method of operating the battery charging device according to claim 13, further comprising: When the value obtained by multiplying the first voltage by the first coefficient is less than the value obtained by multiplying the second voltage by the second coefficient, Connect the body region terminal to the grounding node.

19. A mobile device, comprising: The system includes a processor, a memory, and a storage device; A battery, which supplies power for driving the system and is charged by a system voltage generated by an external power source; and A battery charging device includes a switching transistor and a body region selector. The switching transistor controls the supply of the system voltage to the battery, and the body region selector controls the voltage supplied to the body region terminal of the switching transistor. The switching transistor has a triple-well structure, in which a first well region and a second well region disposed within the first well region and providing the body region terminal are electrically connected to each other. At a first time point, a first voltage is supplied to the gate of the switching transistor, and the battery charging device supplies power from the battery to the system. At a second time point following the first time point, the body region selector disconnects the body region terminal from the ground node and supplies a second voltage output from the battery to the body region terminal via a resistor element. At a third time point after the second time point, when the body region voltage reaches the second voltage and a predetermined time has elapsed, the body region selector short-circuits the node supplying the second voltage to the body region terminal.

20. The mobile device of claim 19, wherein the battery is decoupled from the external power source.

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