A charging device and a charging method

Abstract

The application discloses a charging device and a charging method. The charging device comprises a resistance voltage dividing circuit and a control circuit. The resistance voltage dividing circuit is electrically connected with a power supply and an energy storage device respectively, is used for obtaining an input voltage, and adjusts the voltage input to the energy storage device by adjusting the resistance value in the resistance voltage dividing circuit to charge the energy storage device. The control circuit is electrically connected with the resistance voltage dividing circuit and the energy storage device respectively, can detect a first voltage of the resistance voltage dividing circuit and a second voltage of the energy storage device respectively, and adjusts the resistance value in the resistance voltage dividing circuit based on the first voltage or the second voltage.

Description

Technical Field

[0001] This application relates to the field of charging, and more particularly to a charging device and a charging method. Background Technology

[0002] Currently, charging an energy storage device typically requires a pre-charging stage, a constant current charging stage, and a constant voltage charging stage. Different charging stages require switching between different charging circuits, which results in a large area occupied by the complete charging circuit on the circuit board. Summary of the Invention

[0003] In view of the above, this application provides a charging device and a charging method, the specific solutions of which are as follows:

[0004] A charging device, comprising:

[0005] A resistor voltage divider circuit is electrically connected to the power supply and the energy storage device respectively. It is used to obtain the input voltage. The voltage input to the energy storage device is adjusted by adjusting the resistance value in the resistor voltage divider circuit, thereby charging the energy storage device.

[0006] The control circuit is electrically connected to the resistor voltage divider circuit and the energy storage device, respectively, and is capable of detecting the first voltage of the resistor voltage divider circuit and the second voltage of the energy storage device, and adjusting the resistance value in the resistor voltage divider circuit based on the first voltage or the second voltage.

[0007] Furthermore, the resistor divider circuit includes:

[0008] The first field-effect transistor is electrically connected to the power supply.

[0009] The second field-effect transistor is connected in series with the first field-effect transistor and is electrically connected to the energy storage device.

[0010] The control circuit can detect a first voltage across the first field-effect transistor and adjust the impedance of the second field-effect transistor based on the first voltage or a second voltage.

[0011] Furthermore, the resistor divider circuit includes:

[0012] The first resistor is electrically connected to the power supply.

[0013] The third field-effect transistor is connected in series with the first resistor and is electrically connected to the energy storage device.

[0014] The control circuit can detect a first voltage across the first resistor and adjust the impedance of the third field-effect transistor based on the first voltage or a second voltage.

[0015] Furthermore, the control circuit includes at least:

[0016] A voltage acquisition module is used to acquire the voltage of the energy storage device;

[0017] The control module is used to determine the charging mode based on the voltage of the energy storage device, and to detect the first voltage or the second voltage based on the charging mode.

[0018] Furthermore, the control module determines the charging mode based on the voltage of the energy storage device, and detects the first voltage or the second voltage based on the charging mode, including:

[0019] The control module determines that the voltage of the energy storage device meets the first threshold range, determines the low-power constant current charging mode, and detects the first voltage of the resistor voltage divider circuit based on the low-power constant current charging mode.

[0020] The control circuit further includes: a current differential comparison module;

[0021] The control module determines the first current based on the first voltage and the first resistance value of the resistor divider circuit.

[0022] The current differential comparison module compares the first current with the first current threshold to obtain a first comparison result. Based on the first comparison result, it adjusts the resistance value of the resistor voltage divider circuit so that the first current obtained after adjusting the resistance value of the resistor voltage divider circuit matches the first current threshold.

[0023] Furthermore, the control module determines the charging mode based on the voltage of the energy storage device, and detects the first voltage or the second voltage based on the charging mode, including:

[0024] The control module determines that the voltage of the energy storage device meets the second threshold range, determines the constant voltage charging mode, and detects the second voltage of the energy storage device based on the constant voltage charging mode.

[0025] The control module compares the second voltage with the first voltage threshold to obtain a second comparison result. Based on the second comparison result, it adjusts the resistance value of the resistor divider circuit so that the second voltage obtained after adjusting the resistance value of the resistor divider circuit matches the first voltage threshold.

[0026] Furthermore, the control module determines the charging mode based on the voltage of the energy storage device, and detects the first voltage or the second voltage based on the charging mode, including:

[0027] The control module determines that the voltage of the energy storage device meets the third threshold range and determines the high-power constant current charging mode.

[0028] The charging device also includes: a switched capacitor circuit;

[0029] The control circuit controls the switched capacitor circuit to achieve high-power constant current charging of the energy storage device.

[0030] Furthermore, the resistor voltage divider circuit is electrically connected to the energy storage device, including:

[0031] The resistor voltage divider circuit is electrically connected to the energy storage device through a portion of the switch capacitor circuit;

[0032] If the control module determines a low-power constant current charging mode or a constant voltage charging mode, it controls the partial switches to close and controls the other partial switches in the switched capacitor circuit to open.

[0033] Furthermore,

[0034] The resistor voltage divider circuit and the control circuit are integrated into the first chip, and the switched capacitor circuit is integrated into the second chip.

[0035] or,

[0036] The resistor divider circuit, control circuit, and switched capacitor circuit are integrated into the same chip.

[0037] A charging method, comprising:

[0038] The input voltage is obtained through a resistor voltage divider circuit;

[0039] Detect the first voltage of the resistor divider circuit and the second voltage of the energy storage device;

[0040] The resistance value in the resistor divider circuit is adjusted based on the first voltage or the second voltage to regulate the voltage input to the energy storage device.

[0041] As can be seen from the above technical solutions, the charging device and charging method disclosed in this application include: a resistor voltage divider circuit and a control circuit. The resistor voltage divider circuit is electrically connected to the power supply and the energy storage device respectively, and is used to obtain the input voltage. The voltage input to the energy storage device is adjusted by adjusting the resistance value in the resistor voltage divider circuit, thereby charging the energy storage device. The control circuit is electrically connected to the resistor voltage divider circuit and the energy storage device respectively, and can detect the first voltage of the resistor voltage divider circuit and the second voltage of the energy storage device respectively, and adjust the resistance value in the resistor voltage divider circuit based on the first voltage or the second voltage. In this solution, the control circuit detects the voltage of the resistor voltage divider circuit and the energy storage device respectively, and can adjust the resistance value of the resistor voltage divider circuit based on the detection results, thereby realizing the charging of the energy storage device. Furthermore, by adjusting the resistance value of the resistor voltage divider circuit, the energy storage device can be charged through different charging methods using only the resistor voltage divider circuit and the control circuit, without the need to switch between different charging circuits at different stages, thus reducing the area occupied by the charging device on the circuit board. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the structure of a charging device disclosed in an embodiment of this application;

[0044] Figure 2 This is a schematic diagram of the structure of a charging system disclosed in one embodiment of this application;

[0045] Figure 3 This is a schematic diagram of the structure of a charging system disclosed in another embodiment of this application;

[0046] Figure 4 This is a schematic diagram of the structure of a charging system disclosed in another embodiment of this application;

[0047] Figure 5 This is a schematic diagram of the structure of a charging system disclosed in another embodiment of this application;

[0048] Figure 6 This is a schematic diagram of the structure of a charging device disclosed in an embodiment of this application;

[0049] Figure 7 This is a schematic diagram of the structure of a charging system disclosed in one embodiment of this application;

[0050] Figure 8This is a circuit diagram of a charging system disclosed in an embodiment of this application;

[0051] Figure 9 This is a flowchart of a charging method disclosed in an embodiment of this application. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] This application discloses a charging device, the structural schematic diagram of which is shown below. Figure 1 As shown, it includes:

[0054] Resistor voltage divider circuit 11 and control circuit 12.

[0055] Among them, the resistor voltage divider circuit 11 is electrically connected to the power supply and the energy storage device respectively, and is used to obtain the input voltage. The voltage input to the energy storage device is adjusted by adjusting the resistance value in the resistor voltage divider circuit, so as to charge the energy storage device.

[0056] The control circuit 12 is electrically connected to the resistor voltage divider circuit and the energy storage device, respectively, and can detect the first voltage of the resistor voltage divider circuit and the second voltage of the energy storage device, and adjust the resistance value in the resistor voltage divider circuit based on the first voltage or the second voltage.

[0057] The resistor voltage divider circuit is electrically connected to the power supply, which can obtain the voltage input from the power supply, and can also be electrically connected to the energy storage device to charge the energy storage device, that is, to transfer the voltage input from the power supply to the energy storage device.

[0058] In the process of transmitting the input voltage of the power supply to the energy storage device in the resistive voltage divider circuit, the resistive voltage divider circuit itself has a certain resistance, which can play the purpose of voltage division, that is, to share part of the voltage of the input voltage of the power supply, so that the voltage transmitted to the energy storage device is only a part of the input voltage of the power supply.

[0059] During the process of transmitting the input voltage from the power source to the energy storage device via a resistive voltage divider circuit, the resistive voltage divider circuit can receive control from the control circuit to adjust the resistance value within the circuit. When the resistance value in the resistive voltage divider circuit changes, the voltage across the circuit changes. Since the input voltage of the power source is constant, this results in a change in the voltage ultimately transmitted to the energy storage device, thus changing the voltage required to charge the device.

[0060] When the resistance of the voltage divider circuit increases, the voltage across the voltage divider circuit increases, and the voltage transmitted to the energy storage device decreases; when the resistance of the voltage divider circuit decreases, the voltage across the voltage divider circuit decreases, and the voltage transmitted to the energy storage device increases.

[0061] If the control circuit controls the resistance value of the resistor voltage divider circuit in real time, then the change in the resistance value of the resistor voltage divider circuit is in real time. Similarly, the change in the voltage transmitted to the energy storage device is also in real time. This enables constant voltage charging or constant current charging of the energy storage device based on the control of the control circuit.

[0062] Specifically, if it is constant voltage charging, it is necessary to ensure that the voltage transmitted to the energy storage device is constant. This requires adjusting the voltage transmitted to the energy storage device in real time during the charging process to ensure that it is constant. If it is not constant, the resistance value of the resistor voltage divider circuit needs to be adjusted so that the voltage transmitted to the energy storage device remains constant after adjusting the resistance value of the resistor voltage divider circuit, thus achieving constant voltage charging.

[0063] If constant current charging is used, it is necessary to ensure that the current transmitted to the energy storage device is constant. This requires real-time detection of the current value in the circuit during the charging process. If it is not constant, the resistance value of the resistor divider circuit needs to be adjusted so that the current transmitted to the energy storage device remains constant after adjusting the resistance value of the resistor divider circuit, thus achieving constant current charging.

[0064] The control circuit is electrically connected to the resistor voltage divider circuit and the energy storage device, respectively. It can detect the voltage of the resistor voltage divider circuit and the voltage of the energy storage device, and thus adjust the resistance value in the resistor voltage divider circuit based on the voltage of the resistor voltage divider circuit or the voltage of the energy storage device, so as to realize constant voltage charging, constant current charging, or pre-charging charging modes for the energy storage device.

[0065] A schematic diagram of the charging system is shown below. Figure 2 As shown, it includes: a resistor voltage divider circuit 21, an energy storage device 22, and a control circuit 23. The resistor voltage divider circuit 21 is electrically connected to the energy storage device 22, and the control circuit 23 is electrically connected to both the resistor voltage divider circuit 21 and the energy storage device 22.

[0066] Specifically, when the charging mode is constant voltage charging, it is necessary to detect the voltage at the energy storage device terminal, i.e., the second voltage. By judging the second voltage, it is determined whether the voltage transmitted to the energy storage device is constant voltage, thereby determining whether to adjust the resistance value in the resistor voltage divider circuit. When the charging mode is constant current charging, it is necessary to detect the voltage in the resistor voltage divider circuit, i.e., the first voltage. By judging the first voltage, it is determined whether the current transmitted to the energy storage device is constant current, thereby determining whether to adjust the resistance value in the resistor voltage divider circuit.

[0067] In addition, during the pre-charge phase, the charging current is small and constant. Therefore, when the charging device charges the energy storage device and the charging is in the pre-charge phase, it is equivalent to constant current charging.

[0068] Based on the above method, it is possible to charge the energy storage device through multiple charging modes using a single circuit including a resistor voltage divider circuit and a control circuit. This avoids the problem of the charging equipment occupying a large circuit board area, which is caused by the need to use different charging circuits when charging in different charging modes.

[0069] The charging device disclosed in this embodiment includes: a resistor voltage divider circuit and a control circuit. The resistor voltage divider circuit is electrically connected to a power supply and an energy storage device, respectively, to obtain an input voltage. By adjusting the resistance value in the resistor voltage divider circuit, the voltage input to the energy storage device is adjusted to charge the energy storage device. The control circuit is electrically connected to both the resistor voltage divider circuit and the energy storage device, and can detect a first voltage in the resistor voltage divider circuit and a second voltage in the energy storage device, respectively, and adjust the resistance value in the resistor voltage divider circuit based on the first or second voltage. In this solution, the control circuit detects the voltages of the resistor voltage divider circuit and the energy storage device, and can adjust the resistance value of the resistor voltage divider circuit based on the detection results, thereby charging the energy storage device. Furthermore, by adjusting the resistance value of the resistor voltage divider circuit, charging the energy storage device using different charging methods can be achieved using only the resistor voltage divider circuit and the control circuit, without switching between different charging circuits at different stages, thus reducing the area occupied by the charging device on the circuit board.

[0070] This embodiment discloses a charging device, including:

[0071] Resistor voltage divider circuit and control circuit.

[0072] In addition to having the same structure as the previous embodiment, the resistor voltage divider circuit in this embodiment includes: a first field-effect transistor and a second field-effect transistor.

[0073] The first field-effect transistor is electrically connected to the power supply.

[0074] The second field-effect transistor is connected in series with the first field-effect transistor and is electrically connected to the energy storage device.

[0075] The control circuit can detect the first voltage across the first field-effect transistor and adjust the impedance of the second field-effect transistor based on the first or second voltage.

[0076] Specifically, the structural diagram of the charging system is as follows: Figure 3 As shown, it includes: a first field-effect transistor MOS1, a second field-effect transistor MOS2, a control circuit 32, and an energy storage device 33.

[0077] When the power supply is electrically connected to the charging device, it can be directly connected to the first field-effect transistor in the charging device. The first field-effect transistor is connected in series with the second field-effect transistor, and the second field-effect transistor is electrically connected to the energy storage device. The control device is electrically connected to the first field-effect transistor, the second field-effect transistor, and the energy storage device.

[0078] The power supply is electrically connected to the source (S) of the first field-effect transistor MOS1, the drain (D) of the first field-effect transistor MOS1 is electrically connected to the source (S) of the second field-effect transistor MOS2, the drain (D) of the second field-effect transistor MOS2 is electrically connected to the energy storage device, the gate (G) of the first field-effect transistor MOS1 is electrically connected to the control circuit, and the gate (G) of the second field-effect transistor MOS2 is electrically connected to the control circuit.

[0079] The control circuit is electrically connected to the gate, source, and drain of the first field-effect transistor MOS1, respectively, and can obtain the voltage at the gate, source, and drain of the first field-effect transistor MOS1, thereby determining the voltage difference between the source and drain of the first field-effect transistor MOS1, that is, determining the voltage division of the first field-effect transistor MOS1, i.e., the first voltage.

[0080] The control circuit is electrically connected to the energy storage device and can obtain a second voltage input to the energy storage device; the control circuit adjusts the impedance of the second field-effect transistor MOS2 based on the first voltage or the second voltage;

[0081] The control circuit is electrically connected to the gate of the second field-effect transistor MOS2. It can control the impedance of the second field-effect transistor MOS2 through the gate, so that the voltage transmitted to the energy storage device changes, thereby achieving the purpose of charging the energy storage device through different charging methods.

[0082] Specifically, when adjusting the impedance of the second field-effect transistor MOS2 through the gate, the magnitude of its impedance can be determined by the voltage difference between the gate and the source. The larger the voltage difference between the gate and the source, the smaller the impedance of MOS2, and the larger the voltage difference between the gate and the source, the larger the impedance of MOS2.

[0083] Alternatively, a resistor divider circuit can also consist of only one field-effect transistor.

[0084] When the resistive voltage divider circuit includes only one field-effect transistor (FET), the gate (G), source (S), and drain (D) terminals of the FET are electrically connected to the control circuit. The voltage division of the FET is determined by the voltage difference between its source and drain terminals, and the impedance of the FET is adjusted by adjusting the gate terminal, thereby changing the voltage transmitted to the energy storage device.

[0085] Furthermore, the resistor divider circuit may also include: a first resistor and a third field-effect transistor.

[0086] A schematic diagram of its charging system is shown below. Figure 4 As shown, it includes:

[0087] The first resistor R1, the third field-effect transistor MOS3, the control circuit 32, and the energy storage device 33.

[0088] The first resistor R1 is electrically connected to the power supply and control circuit. The third field-effect transistor MOS3 is connected in series with the first resistor R1 and electrically connected to the energy storage device 33. The control circuit can detect the first voltage across the first resistor R1 and adjust the impedance of the third field-effect transistor based on the first voltage or the second voltage.

[0089] The control circuit obtains the voltage across the first resistor R1, i.e., the first voltage, and determines the adjustment of the third field-effect transistor MOS3 based on the first voltage or the second voltage. The gate of the third field-effect transistor MOS3 is adjusted to change its impedance, thereby changing the voltage transmitted to the energy storage device. This achieves charging of the energy storage device in different charging modes based on the adjustment of the impedance of the third field-effect transistor MOS3.

[0090] In addition, the resistor voltage divider circuit can also include: a resistor electrically connected to the power supply and a variable resistor connected in series with the resistor, and the voltage change transmitted to the energy storage device is realized by adjusting the resistance value of the variable resistor; or, it can also include: a field-effect transistor electrically connected to the power supply and a variable resistor connected in series with the field-effect transistor, etc., and no specific limitation is made here.

[0091] The charging device disclosed in this embodiment includes a resistor voltage divider circuit and a control circuit. The resistor voltage divider circuit includes a first field-effect transistor (FET) and a second FET, which are connected in series. The second FET is electrically connected to an energy storage device. The control device detects the voltage across the first FET, which is electrically connected to the power supply, and adjusts the impedance of the second FET based on this voltage. This ensures that the impedance of the first FET remains constant while only adjusting the impedance of the second FET, avoiding any impact on the voltage of the first FET. This guarantees the accuracy of voltage detection and ensures the precision of the data detected during the charging process of the energy storage device using the charging device disclosed in this embodiment.

[0092] This embodiment discloses a charging device, including:

[0093] Resistor voltage divider circuit and control circuit.

[0094] In addition to having the same structure as the previous embodiment, the control circuit in this embodiment includes a voltage acquisition module and a control module.

[0095] The voltage acquisition module is used to acquire the voltage of the energy storage device.

[0096] The control module is used to determine the charging mode based on the voltage of the energy storage device, and to detect a first voltage or a second voltage based on the charging mode.

[0097] The voltage acquisition module in the control circuit is used to acquire the voltage of the energy storage device. The acquired voltage of the energy storage device is used to determine the charging mode. That is, the charging mode of the charging device is determined based on the voltage of the energy storage device.

[0098] For example, when the voltage of the energy storage device is detected to be less than 3.3V, it can be determined that the current state is a low-current constant-current charging mode. The control module adjusts the resistance value of the resistor voltage divider circuit based on the current state of low-current constant-current charging mode.

[0099] When the voltage of the energy storage device is detected to be 4.43V, it can be determined that the current state is constant voltage charging mode. The control module adjusts the resistance value of the resistor voltage divider circuit based on the current constant voltage charging mode.

[0100] It should be noted that when the charging device is in high-power constant current charging mode, the voltage of the energy storage device can be used to determine whether the charging device is in high-power constant current charging mode, rather than the voltage of the energy storage device. Alternatively, when the voltage of the energy storage device is detected to be 3.3V-4.43V, the switching capacitor circuit can be controlled to make the charging device currently in high-power constant current charging mode.

[0101] In addition, the voltage of the energy storage device collected by the voltage acquisition module can not only be used to determine the charging mode, but also to adjust the resistance value of the resistor divider circuit. That is, after determining the charging mode, if it is necessary to adjust the resistance value in the resistor divider circuit based on the second voltage of the energy storage device, the voltage of the energy storage device collected by the voltage acquisition module can be directly determined as the second voltage, and the resistance value in the resistor divider circuit can be directly adjusted based on the second voltage.

[0102] Furthermore, the voltage acquisition module can also be used to detect the first voltage of the resistor divider circuit. If the voltage acquisition module includes only one voltage acquisition circuit, when the charging mode is determined, the voltage acquisition circuit is controlled to be electrically connected to the energy storage device to detect the voltage of the energy storage device. When it is determined based on the charging mode that the resistance value in the resistor divider circuit needs to be adjusted based on the second voltage, there is no need to acquire the voltage; the voltage of the energy storage device acquired by the voltage acquisition circuit is directly determined as the second voltage. When it is determined based on the charging mode that the resistance value in the resistor divider circuit needs to be adjusted based on the first voltage, the connection state of the voltage acquisition circuit needs to be switched, and the voltage acquisition circuit is controlled to be electrically connected to the resistor divider circuit to detect the first voltage of the resistor divider circuit.

[0103] Alternatively, the voltage acquisition module includes two voltage acquisition circuits. One voltage acquisition circuit is electrically connected to the energy storage device to detect the voltage of the energy storage device, and the other voltage acquisition circuit is electrically connected to the resistor voltage divider circuit to detect the voltage of the resistor voltage divider circuit.

[0104] Furthermore, the control circuit also includes a current differential comparison module, so the schematic diagram of the charging system can be shown as follows: Figure 5 As shown, it includes: a resistor voltage divider circuit 51, an energy storage device 52, a voltage acquisition module 53, a control module 54, and a current differential comparison module 55.

[0105] The control module determines the charging mode based on the voltage of the energy storage device and detects a first voltage or a second voltage based on the charging mode. This includes: the control module determining that the voltage of the energy storage device meets a first threshold range, determining a low-power constant current charging mode, and detecting the first voltage of the resistor divider circuit based on the low-power constant current charging mode; further, the control module determines a first current based on the first voltage and the first resistance value of the resistor divider circuit, the current differential comparison module compares the first current with a first current threshold to obtain a first comparison result, and adjusts the resistance value of the resistor divider circuit based on the first comparison result so that the first current obtained after adjusting the resistance value of the resistor divider circuit matches the first current threshold.

[0106] When the charging device is in low-power constant current charging mode, a current differential comparison module is required to compare current values.

[0107] The voltage of the energy storage device meets the first threshold condition, which can be: the voltage value of the energy storage device is less than 3.3V. At this time, it can be determined that the charging device is in a low-power constant current charging mode.

[0108] In low-power constant-current charging mode, it is necessary to keep the current transmitted from the charging device to the energy storage device constant. Since the resistor voltage divider circuit and the energy storage device are connected in series, the current detected at the resistor voltage divider circuit is the current transmitted to the energy storage device. Therefore, the first voltage of the resistor voltage divider circuit can be determined, and the first current is determined based on the ratio of the first voltage of the resistor voltage divider circuit to the first resistance. This first current is the current value on the charging line.

[0109] For example, in a resistor voltage divider circuit consisting of a first field-effect transistor and a second field-effect transistor connected in series, the voltage across the first field-effect transistor is detected and determined as the first voltage. The impedance of the first field-effect transistor is obtained and determined as the first resistance. The first current passing through the first field-effect transistor is obtained by dividing the first resistance by the impedance of the first field-effect transistor.

[0110] That is, the first voltage and the first resistance are mutually corresponding, and the first resistance is the resistance value of the device corresponding to the first voltage.

[0111] Since the charging device is currently in a low-power constant-current charging mode, after determining the first current on the charging line, it is necessary to compare the first current with a first current threshold to obtain a first comparison result. The first current threshold is the constant current value in the low-power constant-current charging mode.

[0112] If the first comparison result indicates that the first current is greater than the first current threshold, then the current value in the charging circuit needs to be reduced so that the adjusted first current matches the first current threshold. This requires increasing the voltage value in the charging circuit. Since the input voltage from the power supply to the charging device is fixed, increasing the resistance value of the resistor divider circuit can reduce the current in the circuit. Alternatively, if the first comparison result indicates that the first current is less than the first current threshold, then the current value in the charging circuit needs to be increased so that the adjusted first current matches the first current threshold. This requires decreasing the resistance value of the resistor divider circuit to increase the current value in the circuit.

[0113] Continuing with the previous example: when it is determined that the first current of the first field-effect transistor is greater than the first current threshold, the impedance of the second field-effect transistor can be increased; when it is determined that the first current of the first field-effect transistor is less than the first current threshold, the impedance of the second field-effect transistor can be decreased.

[0114] As the charging device charges the energy storage device, the control module judges in real time whether the voltage of the energy storage device meets the first threshold range. When the voltage meets the first threshold range, the current differential comparison module compares the first current with the first current threshold in real time. This allows the current transmitted to the energy storage device to be adjusted in real time during the charging process, ensuring that the current transmitted to the energy storage device always matches the first current threshold. This ensures that the energy storage device is always charged in a low-power constant current charging mode when the voltage of the energy storage device meets the first threshold range.

[0115] Furthermore, the control module determines the charging mode based on the voltage of the energy storage device, and detects the first voltage or the second voltage based on the charging mode, including: the control module determines that the voltage of the energy storage device meets the second threshold condition, determines the constant voltage charging mode, and detects the second voltage of the energy storage device based on the constant voltage charging mode;

[0116] The control module compares the second voltage with the first voltage threshold to obtain a second comparison result. Based on the second comparison result, it adjusts the resistance value of the resistor divider circuit so that the second voltage obtained after adjusting the resistance value of the resistor divider circuit matches the first voltage threshold.

[0117] The voltage of the energy storage device meets the second threshold condition, which can be: the voltage value of the energy storage device is 4.43V. At this time, it can be determined that the charging device is in constant voltage charging mode.

[0118] In constant voltage charging mode, the voltage transmitted from the charging device to the energy storage device needs to remain constant. In this case, the voltage value detected by the energy storage device can be directly used as the second voltage, and the second voltage can be compared with the first voltage threshold.

[0119] Since the charging device is currently in constant voltage charging mode, after determining the second voltage, it is necessary to ensure that the second voltage matches the first voltage threshold. Only when the second voltage matches the first voltage threshold can the voltage input to the energy storage device be guaranteed to be constant.

[0120] Therefore, after determining the second voltage, the second voltage is compared with the first voltage threshold to determine the second comparison result.

[0121] If the second comparison result indicates that the second voltage is greater than the first voltage threshold, then the voltage transmitted to the energy storage device needs to be reduced to match the adjusted second voltage with the first voltage threshold. This requires increasing the voltage value on the charging line. Since the input voltage from the power supply to the charging device is fixed, increasing the resistance value of the resistor divider circuit will increase the voltage of the resistor divider circuit, thereby reducing the voltage transmitted to the energy storage device. Alternatively, if the second comparison result indicates that the second voltage is less than the first voltage threshold, then the voltage transmitted to the energy storage device needs to be increased to match the adjusted second voltage with the first voltage threshold. This requires decreasing the resistance value of the resistor divider circuit to decrease the voltage of the resistor divider circuit, thereby increasing the voltage transmitted to the energy storage device.

[0122] As the charging equipment charges the energy storage device, the control module continuously checks whether the voltage of the energy storage device meets the second threshold range. When the voltage meets the second threshold range, the detected voltage of the energy storage device is determined as the second voltage. The second voltage is compared with the first voltage threshold in real time so that the voltage transmitted to the energy storage device can be adjusted in real time during the charging process. This ensures that the voltage transmitted to the energy storage device always matches the first voltage threshold, and that the energy storage device is always charged in a constant voltage charging mode when the voltage of the energy storage device meets the second threshold range.

[0123] The charging device disclosed in this embodiment includes a resistor voltage divider circuit and a control circuit. The control circuit includes at least a voltage acquisition module and a control module. The voltage acquisition module acquires the voltage of the energy storage device so that the control module can determine the charging mode based on the voltage of the energy storage device and determine the detection of a first voltage or a second voltage based on the charging mode, thereby realizing the adjustment of the resistance value of the voltage acquisition circuit so as to realize the charging of the energy storage device based on different charging modes.

[0124] This embodiment discloses a charging device, including:

[0125] The circuit includes a resistor voltage divider circuit 61, a control circuit 62, and a switched capacitor circuit 63.

[0126] In addition to the same structure as the previous embodiment, the charging device disclosed in this embodiment may also include a switched capacitor circuit.

[0127] Specifically, the control module determines that the voltage of the energy storage device meets the third threshold range and then determines the high-power constant current charging mode. In the high-power constant current charging mode, the control circuit controls the switched capacitor circuit to achieve high-power constant current charging of the energy storage device.

[0128] The voltage of the energy storage device meets the third threshold range, which can be: the voltage of the energy storage device is between 3.3V and 4.43V. At this time, it can be determined that the charging equipment is currently charging the energy storage device in a high-power constant current charging mode. When the charging equipment is charging the energy storage device in a high-power constant current charging mode, it is necessary to control the conduction and shutdown of the switching capacitor circuit in order to achieve high-power constant current charging.

[0129] Additionally, it should be noted that the resistor voltage divider circuit is electrically connected to the energy storage device. In one embodiment, the resistor voltage divider circuit is electrically connected to the energy storage device through a portion of the switches in the switched capacitor circuit. If the control module determines a low-power constant current charging mode or a constant voltage charging mode, it controls the closing of a portion of the switches and opens the other portions of the switches in the switched capacitor circuit except for the portion of the switches.

[0130] The switched capacitor circuit consists of two parts. In the first part, all switches are always closed during low-power constant-current charging or constant-voltage charging modes. In the second part, all switches are open during low-power constant-current charging or constant-voltage charging modes. In other words, in low-power constant-current and constant-voltage charging modes, the first part of the switched capacitor circuit is equivalent to a wire, while the second part is an open circuit and not connected to the charging line.

[0131] In the high-power constant current charging mode, both the first and second parts of the switched capacitor circuit are connected to the charging line. However, after being connected to the charging line, they are not all in a conducting state or all in a closed state. Instead, some parts of the first part are in a conducting state and the other parts are in a closed state. Similarly, some parts of the second part are in a conducting state and the other parts are in a closed state.

[0132] In one embodiment, the switched capacitor circuit includes: a first switch, a second switch, a third switch, a fourth switch, and a first capacitor.

[0133] The circuit diagram of the charging system is as follows: Figure 7 As shown, it includes:

[0134] The circuit includes a resistor voltage divider circuit 71, a control circuit 72, an energy storage device 73, and a switched capacitor circuit 74. The switched capacitor circuit includes a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, and a first capacitor C1.

[0135] The control circuit is electrically connected to the resistor voltage divider circuit and the energy storage device respectively. The resistor voltage divider circuit is electrically connected to the energy storage device through the switched capacitor circuit. Specifically, the resistor voltage divider circuit is electrically connected to one end of the first switch K1, the other end of the first switch K1 is electrically connected to one end of the second switch K2, the other end of the second switch K2 is electrically connected to one end of the third switch K3, and is also electrically connected to the energy storage device 73. The other end of the third switch K3 is connected to one end of the fourth switch K4, and is also connected to the other end of the first switch K1 through the first capacitor C1. The other end of the fourth switch K4 is grounded.

[0136] When the control module determines that the energy storage device is being charged in a high-power constant current charging mode, it controls the first switch combination and the second switch combination to alternately turn on or off based on the high-power constant current charging mode. The first switch combination includes a first switch and a third switch, and the second switch combination includes a second switch and a fourth switch, thereby realizing high-power constant current charging of the energy storage device.

[0137] In high-power constant current charging mode, if the first and third switches are in the on state, the second and fourth switches are in the off state; if the second and fourth switches are in the on state, the first and third switches are in the off state. Furthermore, the first and third switches, as well as the second and fourth switches, are alternately turned on or off.

[0138] When the charging device is charging the energy storage device at high power constant current, the control circuit detects the current in the charging line through a resistor voltage divider circuit. When the detected current exceeds a second current threshold, the resistance of the resistor voltage divider circuit is adjusted to reduce the current in the line and avoid overcurrent. This is overcurrent protection through the control circuit and the resistor voltage divider circuit. In addition, the control circuit can also detect the voltage input to the energy storage device. When the detected voltage exceeds a second voltage threshold, the resistance of the resistor voltage divider circuit is adjusted to reduce the voltage transmitted to the energy storage device and avoid overvoltage. This is overvoltage protection through the control circuit and the resistor voltage divider circuit.

[0139] When the resistor voltage divider circuit consists of the first field-effect transistor MOS1 and the second field-effect transistor MOS2, its circuit diagram is as follows: Figure 8 As shown, it includes: a first field-effect transistor MOS1, a second field-effect transistor MOS2, a control circuit 81, an energy storage device 82, a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a first capacitor C1, and a fourth field-effect transistor MOS4.

[0140] Among them, the end of the second switch K2 that is electrically connected to the third switch K3 is also connected to the source S of the third field-effect transistor MOS3, the drain D of the fourth field-effect transistor MOS4 is connected to the energy storage device 82, and the gate G of the fourth field-effect transistor MOS4 is connected to the control circuit 81.

[0141] Since the control circuit can collect the voltage of the energy storage device, when the control circuit determines that the voltage of the energy storage device meets the preset voltage value, it indicates that the energy storage device is fully charged. At this time, the control circuit controls the gate G of the fourth field-effect transistor MOS4 to turn off the fourth field-effect transistor MOS4, so as to avoid the problem of reduced life of the energy storage device caused by charging the energy storage device when it is fully charged.

[0142] When the fourth field-effect transistor MOS4 is in the off state, if the control circuit detects that the voltage of the energy storage device is lower than the third voltage threshold, the control circuit determines that the energy storage device needs to be charged. At this time, the control circuit controls the gate G of the fourth field-effect transistor MOS4 to turn on the fourth field-effect transistor MOS4, so that the charging line is connected, thereby charging the energy storage device through the charging device.

[0143] Furthermore, since the charging device includes a resistor voltage divider circuit, a control circuit, and a switched capacitor circuit, in one embodiment, the resistor voltage divider circuit, the control circuit, and the switched capacitor circuit can be placed in the same chip during chip design, so that the charging function of the charging device can be realized through a single chip, reducing the area occupied on the circuit board.

[0144] Alternatively, in one embodiment: the resistor voltage divider circuit and control circuit are integrated on the first chip, and the switched capacitor circuit is integrated on the second chip. The charging device is realized through two chips, so that when the charging device is installed on the circuit board, it can be installed based on the remaining space of the circuit board, avoiding the problem that a complete chip needs to occupy a large space.

[0145] The charging device disclosed in this application includes: a resistor voltage divider circuit, a control circuit, and a switched capacitor circuit. When the control circuit determines that the voltage of the energy storage device meets a third threshold range, it determines a high-power constant-current charging mode. At this time, it controls the switched capacitor circuit to achieve high-power constant-current charging of the energy storage device. By determining the charging mode for the energy storage device through the control circuit, it can select to charge the energy storage device through the switched capacitor circuit or to charge the energy storage device by multiplexing a portion of the switched capacitor circuit based on the resistance value adjustment of the resistor voltage divider circuit. Different charging modes can be achieved through the same charging circuit, avoiding the need to use different charging circuits when charging the energy storage device using different charging methods, and reducing the area occupied by the charging device on the circuit board.

[0146] This embodiment discloses a charging method, the flowchart of which is shown below. Figure 9 As shown, it includes:

[0147] Step S91: Obtain the input voltage through a resistor voltage divider circuit;

[0148] Step S92: Detect the first voltage of the resistor divider circuit and the second voltage of the energy storage device;

[0149] Step S93: Adjust the resistance value in the resistor divider circuit based on the first voltage or the second voltage to adjust the voltage input to the energy storage device.

[0150] The charging method disclosed in this embodiment is implemented based on the charging device disclosed in the above embodiments, and will not be described again here.

[0151] The charging method disclosed in this embodiment includes: obtaining an input voltage through a resistor voltage divider circuit; detecting a first voltage of the resistor voltage divider circuit and a second voltage of the energy storage device; and adjusting the resistance value in the resistor voltage divider circuit based on the first voltage or the second voltage to adjust the voltage input to the energy storage device. In this solution, the control circuit detects the voltages of the resistor voltage divider circuit and the energy storage device respectively, and can adjust the resistance value of the resistor voltage divider circuit based on the detection results, thereby charging the energy storage device. Furthermore, by adjusting the resistance value of the resistor voltage divider circuit, charging the energy storage device through different charging methods can be achieved using only the resistor voltage divider circuit and the control circuit, without switching between different charging circuits at different stages, thus reducing the area occupied by the charging device on the circuit board.

[0152] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0153] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0154] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0155] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A charging device, comprising: A resistor voltage divider circuit is electrically connected to the power supply and the energy storage device respectively. It is used to obtain the input voltage. The voltage input to the energy storage device is adjusted by adjusting the resistance value in the resistor voltage divider circuit, thereby charging the energy storage device. The control circuit is electrically connected to the resistor voltage divider circuit and the energy storage device, respectively. It can determine the charging mode based on the collected voltage of the energy storage device, and detect the first voltage of the resistor voltage divider circuit or the second voltage of the energy storage device based on the charging mode. It can adjust the resistance value in the resistor voltage divider circuit based on the first voltage or the second voltage. The method of determining the charging mode based on the collected voltage of the energy storage device includes: determining a low-power constant current charging mode based on the voltage of the energy storage device meeting a first threshold range; determining a constant voltage charging mode based on the voltage of the energy storage device meeting a second threshold range; and determining a high-power constant current charging mode based on the voltage of the energy storage device meeting a third threshold range. The first threshold range is less than a first preset value, the second threshold range is equal to a second preset value, the third threshold range is between the first preset value and the second preset value, and the first preset value is less than the second preset value.

2. The device according to claim 1, wherein, The resistor voltage divider circuit includes: The first field-effect transistor is electrically connected to the power supply. The second field-effect transistor is connected in series with the first field-effect transistor and is electrically connected to the energy storage device. The control circuit can detect a first voltage across the first field-effect transistor and adjust the impedance of the second field-effect transistor based on the first voltage or a second voltage.

3. The device according to claim 1, wherein, The resistor voltage divider circuit includes: The first resistor is electrically connected to the power supply. The third field-effect transistor is connected in series with the first resistor and is electrically connected to the energy storage device. The control circuit can detect a first voltage across the first resistor and adjust the impedance of the third field-effect transistor based on the first voltage or a second voltage.

4. The device according to claim 1, wherein, The control circuit includes at least: A voltage acquisition module is used to acquire the voltage of the energy storage device; The control module is used to determine the charging mode based on the voltage of the energy storage device, and to detect the first voltage or the second voltage based on the charging mode.

5. The device according to claim 4, wherein, The control module determines the charging mode based on the voltage of the energy storage device, and detects the first voltage or the second voltage based on the charging mode, including: The control module determines that the voltage of the energy storage device meets the first threshold range, determines the low-power constant current charging mode, and detects the first voltage of the resistor voltage divider circuit based on the low-power constant current charging mode. The control circuit further includes: a current differential comparison module; The control module determines the first current based on the first voltage and the first resistance value of the resistor divider circuit. The current differential comparison module compares the first current with the first current threshold to obtain a first comparison result. Based on the first comparison result, it adjusts the resistance value of the resistor voltage divider circuit so that the first current obtained after adjusting the resistance value of the resistor voltage divider circuit matches the first current threshold.

6. The device according to claim 4, wherein, The control module determines the charging mode based on the voltage of the energy storage device, and detects the first voltage or the second voltage based on the charging mode, including: The control module determines that the voltage of the energy storage device meets the second threshold range, determines the constant voltage charging mode, and detects the second voltage of the energy storage device based on the constant voltage charging mode. The control module compares the second voltage with the first voltage threshold to obtain a second comparison result. Based on the second comparison result, it adjusts the resistance value of the resistor divider circuit so that the second voltage obtained after adjusting the resistance value of the resistor divider circuit matches the first voltage threshold.

7. The device according to claim 4, wherein, The control module determines the charging mode based on the voltage of the energy storage device, and detects the first voltage or the second voltage based on the charging mode, including: The control module determines that the voltage of the energy storage device meets the third threshold range and determines the high-power constant current charging mode. The charging device also includes: a switched capacitor circuit; The control circuit controls the switched capacitor circuit to achieve high-power constant current charging of the energy storage device.

8. The device according to claim 7, wherein, The resistor voltage divider circuit is electrically connected to the energy storage device, including: The resistor voltage divider circuit is electrically connected to the energy storage device through a portion of the switch capacitor circuit; If the control module determines a low-power constant current charging mode or a constant voltage charging mode, it controls the partial switches to close and controls the other partial switches in the switched capacitor circuit to open.

9. The device according to claim 7, wherein, The resistor voltage divider circuit and the control circuit are integrated into the first chip, and the switched capacitor circuit is integrated into the second chip. or, The resistor divider circuit, control circuit, and switched capacitor circuit are integrated into the same chip.

10. A charging method, comprising: The input voltage is obtained through a resistor voltage divider circuit; The charging mode is determined based on the collected voltage of the energy storage device, and the first voltage of the resistor divider circuit or the second voltage of the energy storage device is detected based on the charging mode. The resistance value in the resistor divider circuit is adjusted based on the first voltage or the second voltage to regulate the voltage input to the energy storage device. The method of determining the charging mode based on the collected voltage of the energy storage device includes: determining a low-power constant current charging mode based on the voltage of the energy storage device meeting a first threshold range; determining a constant voltage charging mode based on the voltage of the energy storage device meeting a second threshold range; and determining a high-power constant current charging mode based on the voltage of the energy storage device meeting a third threshold range. The first threshold range is less than a first preset value, the second threshold range is equal to a second preset value, the third threshold range is between the first preset value and the second preset value, and the first preset value is less than the second preset value.

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